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virtio: virtio 1.0 support, misc patches

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This adds a lot of infrastructure for virtio 1.0 support.
 Notable missing pieces: virtio pci, virtio balloon (needs spec extension),
 vhost scsi.
 
 Plus, there are some minor fixes in a couple of places.
 
 Cc: David Miller <davem@davemloft.net>
 Cc: Rusty Russell <rusty@rustcorp.com.au>
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull virtio updates from Michael Tsirkin:
 "virtio: virtio 1.0 support, misc patches

  This adds a lot of infrastructure for virtio 1.0 support.  Notable
  missing pieces: virtio pci, virtio balloon (needs spec extension),
  vhost scsi.

  Plus, there are some minor fixes in a couple of places.

  Note: some net drivers are affected by these patches.  David said he's
  fine with merging these patches through my tree.

  Rusty's on vacation, he acked using my tree for these, too"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (70 commits)
  virtio_ccw: finalize_features error handling
  virtio_ccw: future-proof finalize_features
  virtio_pci: rename virtio_pci -> virtio_pci_common
  virtio_pci: update file descriptions and copyright
  virtio_pci: split out legacy device support
  virtio_pci: setup config vector indirectly
  virtio_pci: setup vqs indirectly
  virtio_pci: delete vqs indirectly
  virtio_pci: use priv for vq notification
  virtio_pci: free up vq->priv
  virtio_pci: fix coding style for structs
  virtio_pci: add isr field
  virtio: drop legacy_only driver flag
  virtio_balloon: drop legacy_only driver flag
  virtio_ccw: rev 1 devices set VIRTIO_F_VERSION_1
  virtio: allow finalize_features to fail
  virtio_ccw: legacy: don't negotiate rev 1/features
  virtio: add API to detect legacy devices
  virtio_console: fix sparse warnings
  vhost: remove unnecessary forward declarations in vhost.h
  ...
This commit is contained in:
Linus Torvalds 2014-12-11 12:20:31 -08:00
commit 6b9e2cea42
40 changed files with 2050 additions and 1430 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

74
drivers/block/virtio_blk.c
View File

@ -80,7 +80,7 @@ static int __virtblk_add_req(struct virtqueue *vq,
{
struct scatterlist hdr, status, cmd, sense, inhdr, *sgs[6];
unsigned int num_out = 0, num_in = 0;
int type = vbr->out_hdr.type & ~VIRTIO_BLK_T_OUT;
__virtio32 type = vbr->out_hdr.type & ~cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT);
sg_init_one(&hdr, &vbr->out_hdr, sizeof(vbr->out_hdr));
sgs[num_out++] = &hdr;
@ -91,19 +91,19 @@ static int __virtblk_add_req(struct virtqueue *vq,
* block, and before the normal inhdr we put the sense data and the
* inhdr with additional status information.
*/
if (type == VIRTIO_BLK_T_SCSI_CMD) {
if (type == cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_SCSI_CMD)) {
sg_init_one(&cmd, vbr->req->cmd, vbr->req->cmd_len);
sgs[num_out++] = &cmd;
}
if (have_data) {
if (vbr->out_hdr.type & VIRTIO_BLK_T_OUT)
if (vbr->out_hdr.type & cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT))
sgs[num_out++] = data_sg;
else
sgs[num_out + num_in++] = data_sg;
}
if (type == VIRTIO_BLK_T_SCSI_CMD) {
if (type == cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_SCSI_CMD)) {
sg_init_one(&sense, vbr->req->sense, SCSI_SENSE_BUFFERSIZE);
sgs[num_out + num_in++] = &sense;
sg_init_one(&inhdr, &vbr->in_hdr, sizeof(vbr->in_hdr));
@ -119,12 +119,13 @@ static int __virtblk_add_req(struct virtqueue *vq,
static inline void virtblk_request_done(struct request *req)
{
struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
struct virtio_blk *vblk = req->q->queuedata;
int error = virtblk_result(vbr);
if (req->cmd_type == REQ_TYPE_BLOCK_PC) {
req->resid_len = vbr->in_hdr.residual;
req->sense_len = vbr->in_hdr.sense_len;
req->errors = vbr->in_hdr.errors;
req->resid_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.residual);
req->sense_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.sense_len);
req->errors = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.errors);
} else if (req->cmd_type == REQ_TYPE_SPECIAL) {
req->errors = (error != 0);
}
@ -173,25 +174,25 @@ static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req,
vbr->req = req;
if (req->cmd_flags & REQ_FLUSH) {
vbr->out_hdr.type = VIRTIO_BLK_T_FLUSH;
vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_FLUSH);
vbr->out_hdr.sector = 0;
vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
} else {
switch (req->cmd_type) {
case REQ_TYPE_FS:
vbr->out_hdr.type = 0;
vbr->out_hdr.sector = blk_rq_pos(vbr->req);
vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
vbr->out_hdr.sector = cpu_to_virtio64(vblk->vdev, blk_rq_pos(vbr->req));
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
break;
case REQ_TYPE_BLOCK_PC:
vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD;
vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_SCSI_CMD);
vbr->out_hdr.sector = 0;
vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
break;
case REQ_TYPE_SPECIAL:
vbr->out_hdr.type = VIRTIO_BLK_T_GET_ID;
vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_GET_ID);
vbr->out_hdr.sector = 0;
vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
break;
default:
/* We don't put anything else in the queue. */
@ -204,9 +205,9 @@ static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req,
num = blk_rq_map_sg(hctx->queue, vbr->req, vbr->sg);
if (num) {
if (rq_data_dir(vbr->req) == WRITE)
vbr->out_hdr.type |= VIRTIO_BLK_T_OUT;
vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_OUT);
else
vbr->out_hdr.type |= VIRTIO_BLK_T_IN;
vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_IN);
}
spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
@ -331,7 +332,8 @@ static ssize_t virtblk_serial_show(struct device *dev,
return err;
}
DEVICE_ATTR(serial, S_IRUGO, virtblk_serial_show, NULL);
static DEVICE_ATTR(serial, S_IRUGO, virtblk_serial_show, NULL);
static void virtblk_config_changed_work(struct work_struct *work)
{
@ -476,7 +478,8 @@ static int virtblk_get_cache_mode(struct virtio_device *vdev)
struct virtio_blk_config, wce,
&writeback);
if (err)
writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_WCE);
writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_WCE) ||
virtio_has_feature(vdev, VIRTIO_F_VERSION_1);
return writeback;
}
@ -821,25 +824,34 @@ static const struct virtio_device_id id_table[] = {
{ 0 },
};
static unsigned int features[] = {
static unsigned int features_legacy[] = {
VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_SCSI,
VIRTIO_BLK_F_WCE, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
VIRTIO_BLK_F_MQ,
}
;
static unsigned int features[] = {
VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
VIRTIO_BLK_F_TOPOLOGY,
VIRTIO_BLK_F_MQ,
};
static struct virtio_driver virtio_blk = {
.feature_table = features,
.feature_table_size = ARRAY_SIZE(features),
.driver.name = KBUILD_MODNAME,
.driver.owner = THIS_MODULE,
.id_table = id_table,
.probe = virtblk_probe,
.remove = virtblk_remove,
.config_changed = virtblk_config_changed,
.feature_table = features,
.feature_table_size = ARRAY_SIZE(features),
.feature_table_legacy = features_legacy,
.feature_table_size_legacy = ARRAY_SIZE(features_legacy),
.driver.name = KBUILD_MODNAME,
.driver.owner = THIS_MODULE,
.id_table = id_table,
.probe = virtblk_probe,
.remove = virtblk_remove,
.config_changed = virtblk_config_changed,
#ifdef CONFIG_PM_SLEEP
.freeze = virtblk_freeze,
.restore = virtblk_restore,
.freeze = virtblk_freeze,
.restore = virtblk_restore,
#endif
};
@ -871,8 +883,8 @@ out_destroy_workqueue:
static void __exit fini(void)
{
unregister_blkdev(major, "virtblk");
unregister_virtio_driver(&virtio_blk);
unregister_blkdev(major, "virtblk");
destroy_workqueue(virtblk_wq);
}
module_init(init);

39
drivers/char/virtio_console.c
View File

@ -355,7 +355,7 @@ static inline bool use_multiport(struct ports_device *portdev)
*/
if (!portdev->vdev)
return 0;
return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT);
return __virtio_test_bit(portdev->vdev, VIRTIO_CONSOLE_F_MULTIPORT);
}
static DEFINE_SPINLOCK(dma_bufs_lock);
@ -566,9 +566,9 @@ static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id,
if (!use_multiport(portdev))
return 0;
cpkt.id = port_id;
cpkt.event = event;
cpkt.value = value;
cpkt.id = cpu_to_virtio32(portdev->vdev, port_id);
cpkt.event = cpu_to_virtio16(portdev->vdev, event);
cpkt.value = cpu_to_virtio16(portdev->vdev, value);
vq = portdev->c_ovq;
@ -669,8 +669,8 @@ done:
* Give out the data that's requested from the buffer that we have
* queued up.
*/
static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count,
bool to_user)
static ssize_t fill_readbuf(struct port *port, char __user *out_buf,
size_t out_count, bool to_user)
{
struct port_buffer *buf;
unsigned long flags;
@ -688,7 +688,8 @@ static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count,
if (ret)
return -EFAULT;
} else {
memcpy(out_buf, buf->buf + buf->offset, out_count);
memcpy((__force char *)out_buf, buf->buf + buf->offset,
out_count);
}
buf->offset += out_count;
@ -1162,7 +1163,7 @@ static int get_chars(u32 vtermno, char *buf, int count)
/* If we don't have an input queue yet, we can't get input. */
BUG_ON(!port->in_vq);
return fill_readbuf(port, buf, count, false);
return fill_readbuf(port, (__force char __user *)buf, count, false);
}
static void resize_console(struct port *port)
@ -1602,7 +1603,8 @@ static void unplug_port(struct port *port)
}
/* Any private messages that the Host and Guest want to share */
static void handle_control_message(struct ports_device *portdev,
static void handle_control_message(struct virtio_device *vdev,
struct ports_device *portdev,
struct port_buffer *buf)
{
struct virtio_console_control *cpkt;
@ -1612,15 +1614,16 @@ static void handle_control_message(struct ports_device *portdev,
cpkt = (struct virtio_console_control *)(buf->buf + buf->offset);
port = find_port_by_id(portdev, cpkt->id);
if (!port && cpkt->event != VIRTIO_CONSOLE_PORT_ADD) {
port = find_port_by_id(portdev, virtio32_to_cpu(vdev, cpkt->id));
if (!port &&
cpkt->event != cpu_to_virtio16(vdev, VIRTIO_CONSOLE_PORT_ADD)) {
/* No valid header at start of buffer. Drop it. */
dev_dbg(&portdev->vdev->dev,
"Invalid index %u in control packet\n", cpkt->id);
return;
}
switch (cpkt->event) {
switch (virtio16_to_cpu(vdev, cpkt->event)) {
case VIRTIO_CONSOLE_PORT_ADD:
if (port) {
dev_dbg(&portdev->vdev->dev,
@ -1628,13 +1631,15 @@ static void handle_control_message(struct ports_device *portdev,
send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1);
break;
}
if (cpkt->id >= portdev->config.max_nr_ports) {
if (virtio32_to_cpu(vdev, cpkt->id) >=
portdev->config.max_nr_ports) {
dev_warn(&portdev->vdev->dev,
"Request for adding port with out-of-bound id %u, max. supported id: %u\n",
"Request for adding port with "
"out-of-bound id %u, max. supported id: %u\n",
cpkt->id, portdev->config.max_nr_ports - 1);
break;
}
add_port(portdev, cpkt->id);
add_port(portdev, virtio32_to_cpu(vdev, cpkt->id));
break;
case VIRTIO_CONSOLE_PORT_REMOVE:
unplug_port(port);
@ -1670,7 +1675,7 @@ static void handle_control_message(struct ports_device *portdev,
break;
}
case VIRTIO_CONSOLE_PORT_OPEN:
port->host_connected = cpkt->value;
port->host_connected = virtio16_to_cpu(vdev, cpkt->value);
wake_up_interruptible(&port->waitqueue);
/*
* If the host port got closed and the host had any
@ -1752,7 +1757,7 @@ static void control_work_handler(struct work_struct *work)
buf->len = len;
buf->offset = 0;
handle_control_message(portdev, buf);
handle_control_message(vq->vdev, portdev, buf);
spin_lock(&portdev->c_ivq_lock);
if (add_inbuf(portdev->c_ivq, buf) < 0) {

17
drivers/lguest/lguest_device.c
View File

@ -94,7 +94,7 @@ static unsigned desc_size(const struct lguest_device_desc *desc)
}
/* This gets the device's feature bits. */
static u32 lg_get_features(struct virtio_device *vdev)
static u64 lg_get_features(struct virtio_device *vdev)
{
unsigned int i;
u32 features = 0;
@ -126,7 +126,7 @@ static void status_notify(struct virtio_device *vdev)
* sorted out, this routine is called so we can tell the Host which features we
* understand and accept.
*/
static void lg_finalize_features(struct virtio_device *vdev)
static int lg_finalize_features(struct virtio_device *vdev)
{
unsigned int i, bits;
struct lguest_device_desc *desc = to_lgdev(vdev)->desc;
@ -136,20 +136,25 @@ static void lg_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
/* Make sure we don't have any features > 32 bits! */
BUG_ON((u32)vdev->features != vdev->features);
/*
* The vdev->feature array is a Linux bitmask: this isn't the same as a
* the simple array of bits used by lguest devices for features. So we
* do this slow, manual conversion which is completely general.
* Since lguest is currently x86-only, we're little-endian. That
* means we could just memcpy. But it's not time critical, and in
* case someone copies this code, we do it the slow, obvious way.
*/
memset(out_features, 0, desc->feature_len);
bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8;
for (i = 0; i < bits; i++) {
if (test_bit(i, vdev->features))
if (__virtio_test_bit(vdev, i))
out_features[i / 8] |= (1 << (i % 8));
}
/* Tell Host we've finished with this device's feature negotiation */
status_notify(vdev);
return 0;
}
/* Once they've found a field, getting a copy of it is easy. */

14
drivers/misc/mic/card/mic_virtio.c
View File

@ -68,7 +68,7 @@ static inline struct device *mic_dev(struct mic_vdev *mvdev)
}
/* This gets the device's feature bits. */
static u32 mic_get_features(struct virtio_device *vdev)
static u64 mic_get_features(struct virtio_device *vdev)
{
unsigned int i, bits;
u32 features = 0;
@ -76,8 +76,7 @@ static u32 mic_get_features(struct virtio_device *vdev)
u8 __iomem *in_features = mic_vq_features(desc);
int feature_len = ioread8(&desc->feature_len);
bits = min_t(unsigned, feature_len,
sizeof(vdev->features)) * 8;
bits = min_t(unsigned, feature_len, sizeof(features)) * 8;
for (i = 0; i < bits; i++)
if (ioread8(&in_features[i / 8]) & (BIT(i % 8)))
features |= BIT(i);
@ -85,7 +84,7 @@ static u32 mic_get_features(struct virtio_device *vdev)
return features;
}
static void mic_finalize_features(struct virtio_device *vdev)
static int mic_finalize_features(struct virtio_device *vdev)
{
unsigned int i, bits;
struct mic_device_desc __iomem *desc = to_micvdev(vdev)->desc;
@ -97,14 +96,19 @@ static void mic_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
/* Make sure we don't have any features > 32 bits! */
BUG_ON((u32)vdev->features != vdev->features);
memset_io(out_features, 0, feature_len);
bits = min_t(unsigned, feature_len,
sizeof(vdev->features)) * 8;
for (i = 0; i < bits; i++) {
if (test_bit(i, vdev->features))
if (__virtio_test_bit(vdev, i))
iowrite8(ioread8(&out_features[i / 8]) | (1 << (i % 8)),
&out_features[i / 8]);
}
return 0;
}
/*

68
drivers/net/macvtap.c
View File

@ -45,6 +45,18 @@ struct macvtap_queue {
struct list_head next;
};
#define MACVTAP_FEATURES (IFF_VNET_HDR | IFF_VNET_LE | IFF_MULTI_QUEUE)
static inline u16 macvtap16_to_cpu(struct macvtap_queue *q, __virtio16 val)
{
return __virtio16_to_cpu(q->flags & IFF_VNET_LE, val);
}
static inline __virtio16 cpu_to_macvtap16(struct macvtap_queue *q, u16 val)
{
return __cpu_to_virtio16(q->flags & IFF_VNET_LE, val);
}
static struct proto macvtap_proto = {
.name = "macvtap",
.owner = THIS_MODULE,
@ -557,7 +569,8 @@ static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad,
* macvtap_skb_from_vnet_hdr and macvtap_skb_to_vnet_hdr should
* be shared with the tun/tap driver.
*/
static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb,
static int macvtap_skb_from_vnet_hdr(struct macvtap_queue *q,
struct sk_buff *skb,
struct virtio_net_hdr *vnet_hdr)
{
unsigned short gso_type = 0;
@ -588,13 +601,13 @@ static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb,
}
if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
if (!skb_partial_csum_set(skb, vnet_hdr->csum_start,
vnet_hdr->csum_offset))
if (!skb_partial_csum_set(skb, macvtap16_to_cpu(q, vnet_hdr->csum_start),
macvtap16_to_cpu(q, vnet_hdr->csum_offset)))
return -EINVAL;
}
if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
skb_shinfo(skb)->gso_size = vnet_hdr->gso_size;
skb_shinfo(skb)->gso_size = macvtap16_to_cpu(q, vnet_hdr->gso_size);
skb_shinfo(skb)->gso_type = gso_type;
/* Header must be checked, and gso_segs computed. */
@ -604,8 +617,9 @@ static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb,
return 0;
}
static void macvtap_skb_to_vnet_hdr(const struct sk_buff *skb,
struct virtio_net_hdr *vnet_hdr)
static void macvtap_skb_to_vnet_hdr(struct macvtap_queue *q,
const struct sk_buff *skb,
struct virtio_net_hdr *vnet_hdr)
{
memset(vnet_hdr, 0, sizeof(*vnet_hdr));
@ -613,8 +627,8 @@ static void macvtap_skb_to_vnet_hdr(const struct sk_buff *skb,
struct skb_shared_info *sinfo = skb_shinfo(skb);
/* This is a hint as to how much should be linear. */
vnet_hdr->hdr_len = skb_headlen(skb);
vnet_hdr->gso_size = sinfo->gso_size;
vnet_hdr->hdr_len = cpu_to_macvtap16(q, skb_headlen(skb));
vnet_hdr->gso_size = cpu_to_macvtap16(q, sinfo->gso_size);
if (sinfo->gso_type & SKB_GSO_TCPV4)
vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
else if (sinfo->gso_type & SKB_GSO_TCPV6)
@ -628,10 +642,13 @@ static void macvtap_skb_to_vnet_hdr(const struct sk_buff *skb,
if (skb->ip_summed == CHECKSUM_PARTIAL) {
vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
vnet_hdr->csum_start = skb_checksum_start_offset(skb);
if (vlan_tx_tag_present(skb))
vnet_hdr->csum_start += VLAN_HLEN;
vnet_hdr->csum_offset = skb->csum_offset;
vnet_hdr->csum_start = cpu_to_macvtap16(q,
skb_checksum_start_offset(skb) + VLAN_HLEN);
else
vnet_hdr->csum_start = cpu_to_macvtap16(q,
skb_checksum_start_offset(skb));
vnet_hdr->csum_offset = cpu_to_macvtap16(q, skb->csum_offset);
} else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
vnet_hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID;
} /* else everything is zero */
@ -666,12 +683,14 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
if (err < 0)
goto err;
if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
vnet_hdr.hdr_len)
vnet_hdr.hdr_len = vnet_hdr.csum_start +
vnet_hdr.csum_offset + 2;
macvtap16_to_cpu(q, vnet_hdr.csum_start) +
macvtap16_to_cpu(q, vnet_hdr.csum_offset) + 2 >
macvtap16_to_cpu(q, vnet_hdr.hdr_len))
vnet_hdr.hdr_len = cpu_to_macvtap16(q,
macvtap16_to_cpu(q, vnet_hdr.csum_start) +
macvtap16_to_cpu(q, vnet_hdr.csum_offset) + 2);
err = -EINVAL;
if (vnet_hdr.hdr_len > len)
if (macvtap16_to_cpu(q, vnet_hdr.hdr_len) > len)
goto err;
}
@ -684,7 +703,8 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
goto err;
if (m && m->msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) {
copylen = vnet_hdr.hdr_len ? vnet_hdr.hdr_len : GOODCOPY_LEN;
copylen = vnet_hdr.hdr_len ?
macvtap16_to_cpu(q, vnet_hdr.hdr_len) : GOODCOPY_LEN;
if (copylen > good_linear)
copylen = good_linear;
linear = copylen;
@ -695,10 +715,10 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
if (!zerocopy) {
copylen = len;
if (vnet_hdr.hdr_len > good_linear)
if (macvtap16_to_cpu(q, vnet_hdr.hdr_len) > good_linear)
linear = good_linear;
else
linear = vnet_hdr.hdr_len;
linear = macvtap16_to_cpu(q, vnet_hdr.hdr_len);
}
skb = macvtap_alloc_skb(&q->sk, NET_IP_ALIGN, copylen,
@ -725,7 +745,7 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
skb->protocol = eth_hdr(skb)->h_proto;
if (vnet_hdr_len) {
err = macvtap_skb_from_vnet_hdr(skb, &vnet_hdr);
err = macvtap_skb_from_vnet_hdr(q, skb, &vnet_hdr);
if (err)
goto err_kfree;
}
@ -791,7 +811,7 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
if ((len -= vnet_hdr_len) < 0)
return -EINVAL;
macvtap_skb_to_vnet_hdr(skb, &vnet_hdr);
macvtap_skb_to_vnet_hdr(q, skb, &vnet_hdr);
if (memcpy_toiovecend(iv, (void *)&vnet_hdr, 0, sizeof(vnet_hdr)))
return -EFAULT;
@ -1003,8 +1023,7 @@ static long macvtap_ioctl(struct file *file, unsigned int cmd,
return -EFAULT;
ret = 0;
if ((u & ~(IFF_VNET_HDR | IFF_MULTI_QUEUE)) !=
(IFF_NO_PI | IFF_TAP))
if ((u & ~MACVTAP_FEATURES) != (IFF_NO_PI | IFF_TAP))
ret = -EINVAL;
else
q->flags = u;
@ -1036,8 +1055,7 @@ static long macvtap_ioctl(struct file *file, unsigned int cmd,
return ret;
case TUNGETFEATURES:
if (put_user(IFF_TAP | IFF_NO_PI | IFF_VNET_HDR |
IFF_MULTI_QUEUE, up))
if (put_user(IFF_TAP | IFF_NO_PI | MACVTAP_FEATURES, up))
return -EFAULT;
return 0;

168
drivers/net/tun.c
View File

@ -103,6 +103,15 @@ do { \
} while (0)
#endif
/* TUN device flags */
/* IFF_ATTACH_QUEUE is never stored in device flags,
* overload it to mean fasync when stored there.
*/
#define TUN_FASYNC IFF_ATTACH_QUEUE
#define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \
IFF_VNET_LE | IFF_MULTI_QUEUE)
#define GOODCOPY_LEN 128
#define FLT_EXACT_COUNT 8
@ -196,6 +205,16 @@ struct tun_struct {
u32 flow_count;
};
static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val)
{
return __virtio16_to_cpu(tun->flags & IFF_VNET_LE, val);
}
static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val)
{
return __cpu_to_virtio16(tun->flags & IFF_VNET_LE, val);
}
static inline u32 tun_hashfn(u32 rxhash)
{
return rxhash & 0x3ff;
@ -472,7 +491,7 @@ static void __tun_detach(struct tun_file *tfile, bool clean)
if (tun && tun->numqueues == 0 && tun->numdisabled == 0) {
netif_carrier_off(tun->dev);
if (!(tun->flags & TUN_PERSIST) &&
if (!(tun->flags & IFF_PERSIST) &&
tun->dev->reg_state == NETREG_REGISTERED)
unregister_netdevice(tun->dev);
}
@ -523,7 +542,7 @@ static void tun_detach_all(struct net_device *dev)
}
BUG_ON(tun->numdisabled != 0);
if (tun->flags & TUN_PERSIST)
if (tun->flags & IFF_PERSIST)
module_put(THIS_MODULE);
}
@ -541,7 +560,7 @@ static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filte
goto out;
err = -EBUSY;
if (!(tun->flags & TUN_TAP_MQ) && tun->numqueues == 1)
if (!(tun->flags & IFF_MULTI_QUEUE) && tun->numqueues == 1)
goto out;
err = -E2BIG;
@ -920,7 +939,7 @@ static void tun_net_init(struct net_device *dev)
struct tun_struct *tun = netdev_priv(dev);
switch (tun->flags & TUN_TYPE_MASK) {
case TUN_TUN_DEV:
case IFF_TUN:
dev->netdev_ops = &tun_netdev_ops;
/* Point-to-Point TUN Device */
@ -934,7 +953,7 @@ static void tun_net_init(struct net_device *dev)
dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
break;
case TUN_TAP_DEV:
case IFF_TAP:
dev->netdev_ops = &tap_netdev_ops;
/* Ethernet TAP Device */
ether_setup(dev);
@ -1025,7 +1044,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
int err;
u32 rxhash;
if (!(tun->flags & TUN_NO_PI)) {
if (!(tun->flags & IFF_NO_PI)) {
if (len < sizeof(pi))
return -EINVAL;
len -= sizeof(pi);
@ -1035,7 +1054,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
offset += sizeof(pi);
}
if (tun->flags & TUN_VNET_HDR) {
if (tun->flags & IFF_VNET_HDR) {
if (len < tun->vnet_hdr_sz)
return -EINVAL;
len -= tun->vnet_hdr_sz;
@ -1044,18 +1063,18 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
return -EFAULT;
if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
gso.csum_start + gso.csum_offset + 2 > gso.hdr_len)
gso.hdr_len = gso.csum_start + gso.csum_offset + 2;
tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len))
gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2);
if (gso.hdr_len > len)
if (tun16_to_cpu(tun, gso.hdr_len) > len)
return -EINVAL;
offset += tun->vnet_hdr_sz;
}
if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {
if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) {
align += NET_IP_ALIGN;
if (unlikely(len < ETH_HLEN ||
(gso.hdr_len && gso.hdr_len < ETH_HLEN)))
(gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN)))
return -EINVAL;
}
@ -1066,7 +1085,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
* enough room for skb expand head in case it is used.
* The rest of the buffer is mapped from userspace.
*/
copylen = gso.hdr_len ? gso.hdr_len : GOODCOPY_LEN;
copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN;
if (copylen > good_linear)
copylen = good_linear;
linear = copylen;
@ -1076,10 +1095,10 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
if (!zerocopy) {
copylen = len;
if (gso.hdr_len > good_linear)
if (tun16_to_cpu(tun, gso.hdr_len) > good_linear)
linear = good_linear;
else
linear = gso.hdr_len;
linear = tun16_to_cpu(tun, gso.hdr_len);
}
skb = tun_alloc_skb(tfile, align, copylen, linear, noblock);
@ -1106,8 +1125,8 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
}
if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
if (!skb_partial_csum_set(skb, gso.csum_start,
gso.csum_offset)) {
if (!skb_partial_csum_set(skb, tun16_to_cpu(tun, gso.csum_start),
tun16_to_cpu(tun, gso.csum_offset))) {
tun->dev->stats.rx_frame_errors++;
kfree_skb(skb);
return -EINVAL;
@ -1115,8 +1134,8 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
}
switch (tun->flags & TUN_TYPE_MASK) {
case TUN_TUN_DEV:
if (tun->flags & TUN_NO_PI) {
case IFF_TUN:
if (tun->flags & IFF_NO_PI) {
switch (skb->data[0] & 0xf0) {
case 0x40:
pi.proto = htons(ETH_P_IP);
@ -1135,7 +1154,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
skb->protocol = pi.proto;
skb->dev = tun->dev;
break;
case TUN_TAP_DEV:
case IFF_TAP:
skb->protocol = eth_type_trans(skb, tun->dev);
break;
}
@ -1175,7 +1194,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN)
skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
skb_shinfo(skb)->gso_size = gso.gso_size;
skb_shinfo(skb)->gso_size = tun16_to_cpu(tun, gso.gso_size);
if (skb_shinfo(skb)->gso_size == 0) {
tun->dev->stats.rx_frame_errors++;
kfree_skb(skb);
@ -1241,10 +1260,10 @@ static ssize_t tun_put_user(struct tun_struct *tun,
if (vlan_tx_tag_present(skb))
vlan_hlen = VLAN_HLEN;
if (tun->flags & TUN_VNET_HDR)
if (tun->flags & IFF_VNET_HDR)
vnet_hdr_sz = tun->vnet_hdr_sz;
if (!(tun->flags & TUN_NO_PI)) {
if (!(tun->flags & IFF_NO_PI)) {
if ((len -= sizeof(pi)) < 0)
return -EINVAL;
@ -1267,8 +1286,8 @@ static ssize_t tun_put_user(struct tun_struct *tun,
struct skb_shared_info *sinfo = skb_shinfo(skb);
/* This is a hint as to how much should be linear. */
gso.hdr_len = skb_headlen(skb);
gso.gso_size = sinfo->gso_size;
gso.hdr_len = cpu_to_tun16(tun, skb_headlen(skb));
gso.gso_size = cpu_to_tun16(tun, sinfo->gso_size);
if (sinfo->gso_type & SKB_GSO_TCPV4)
gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
else if (sinfo->gso_type & SKB_GSO_TCPV6)
@ -1276,12 +1295,12 @@ static ssize_t tun_put_user(struct tun_struct *tun,
else {
pr_err("unexpected GSO type: "
"0x%x, gso_size %d, hdr_len %d\n",
sinfo->gso_type, gso.gso_size,
gso.hdr_len);
sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size),
tun16_to_cpu(tun, gso.hdr_len));
print_hex_dump(KERN_ERR, "tun: ",
DUMP_PREFIX_NONE,
16, 1, skb->head,
min((int)gso.hdr_len, 64), true);
min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true);
WARN_ON_ONCE(1);
return -EINVAL;
}
@ -1292,9 +1311,9 @@ static ssize_t tun_put_user(struct tun_struct *tun,
if (skb->ip_summed == CHECKSUM_PARTIAL) {
gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
gso.csum_start = skb_checksum_start_offset(skb) +
vlan_hlen;
gso.csum_offset = skb->csum_offset;
gso.csum_start = cpu_to_tun16(tun, skb_checksum_start_offset(skb) +
vlan_hlen);
gso.csum_offset = cpu_to_tun16(tun, skb->csum_offset);
} else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
gso.flags = VIRTIO_NET_HDR_F_DATA_VALID;
} /* else everything is zero */
@ -1521,32 +1540,7 @@ static struct proto tun_proto = {
static int tun_flags(struct tun_struct *tun)
{
int flags = 0;
if (tun->flags & TUN_TUN_DEV)
flags |= IFF_TUN;
else
flags |= IFF_TAP;
if (tun->flags & TUN_NO_PI)
flags |= IFF_NO_PI;
/* This flag has no real effect. We track the value for backwards
* compatibility.
*/
if (tun->flags & TUN_ONE_QUEUE)
flags |= IFF_ONE_QUEUE;
if (tun->flags & TUN_VNET_HDR)
flags |= IFF_VNET_HDR;
if (tun->flags & TUN_TAP_MQ)
flags |= IFF_MULTI_QUEUE;
if (tun->flags & TUN_PERSIST)
flags |= IFF_PERSIST;
return flags;
return tun->flags & (TUN_FEATURES | IFF_PERSIST | IFF_TUN | IFF_TAP);
}
static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr,
@ -1602,7 +1596,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
return -EINVAL;
if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) !=
!!(tun->flags & TUN_TAP_MQ))
!!(tun->flags & IFF_MULTI_QUEUE))
return -EINVAL;
if (tun_not_capable(tun))
@ -1615,7 +1609,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
if (err < 0)
return err;
if (tun->flags & TUN_TAP_MQ &&
if (tun->flags & IFF_MULTI_QUEUE &&
(tun->numqueues + tun->numdisabled > 1)) {
/* One or more queue has already been attached, no need
* to initialize the device again.
@ -1638,11 +1632,11 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
/* Set dev type */
if (ifr->ifr_flags & IFF_TUN) {
/* TUN device */
flags |= TUN_TUN_DEV;
flags |= IFF_TUN;
name = "tun%d";
} else if (ifr->ifr_flags & IFF_TAP) {
/* TAP device */
flags |= TUN_TAP_DEV;
flags |= IFF_TAP;
name = "tap%d";
} else
return -EINVAL;
@ -1706,28 +1700,8 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
tun_debug(KERN_INFO, tun, "tun_set_iff\n");
if (ifr->ifr_flags & IFF_NO_PI)
tun->flags |= TUN_NO_PI;
else
tun->flags &= ~TUN_NO_PI;
/* This flag has no real effect. We track the value for backwards
* compatibility.
*/
if (ifr->ifr_flags & IFF_ONE_QUEUE)
tun->flags |= TUN_ONE_QUEUE;
else
tun->flags &= ~TUN_ONE_QUEUE;
if (ifr->ifr_flags & IFF_VNET_HDR)
tun->flags |= TUN_VNET_HDR;
else
tun->flags &= ~TUN_VNET_HDR;
if (ifr->ifr_flags & IFF_MULTI_QUEUE)
tun->flags |= TUN_TAP_MQ;
else
tun->flags &= ~TUN_TAP_MQ;
tun->flags = (tun->flags & ~TUN_FEATURES) |
(ifr->ifr_flags & TUN_FEATURES);
/* Make sure persistent devices do not get stuck in
* xoff state.
@ -1855,7 +1829,7 @@ static int tun_set_queue(struct file *file, struct ifreq *ifr)
ret = tun_attach(tun, file, false);
} else if (ifr->ifr_flags & IFF_DETACH_QUEUE) {
tun = rtnl_dereference(tfile->tun);
if (!tun || !(tun->flags & TUN_TAP_MQ) || tfile->detached)
if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached)
ret = -EINVAL;
else
__tun_detach(tfile, false);
@ -1890,9 +1864,9 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
if (cmd == TUNGETFEATURES) {
/* Currently this just means: "what IFF flags are valid?".
* This is needed because we never checked for invalid flags on
* TUNSETIFF. */
return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE |
IFF_VNET_HDR | IFF_MULTI_QUEUE,
* TUNSETIFF.
*/
return put_user(IFF_TUN | IFF_TAP | TUN_FEATURES,
(unsigned int __user*)argp);
} else if (cmd == TUNSETQUEUE)
return tun_set_queue(file, &ifr);
@ -1959,12 +1933,12 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
/* Disable/Enable persist mode. Keep an extra reference to the
* module to prevent the module being unprobed.
*/
if (arg && !(tun->flags & TUN_PERSIST)) {
tun->flags |= TUN_PERSIST;
if (arg && !(tun->flags & IFF_PERSIST)) {
tun->flags |= IFF_PERSIST;
__module_get(THIS_MODULE);
}
if (!arg && (tun->flags & TUN_PERSIST)) {
tun->flags &= ~TUN_PERSIST;
if (!arg && (tun->flags & IFF_PERSIST)) {
tun->flags &= ~IFF_PERSIST;
module_put(THIS_MODULE);
}
@ -2022,7 +1996,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
case TUNSETTXFILTER:
/* Can be set only for TAPs */
ret = -EINVAL;
if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)
if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP)
break;
ret = update_filter(&tun->txflt, (void __user *)arg);
break;
@ -2081,7 +2055,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
case TUNATTACHFILTER:
/* Can be set only for TAPs */
ret = -EINVAL;
if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)
if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP)
break;
ret = -EFAULT;
if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog)))
@ -2093,7 +2067,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
case TUNDETACHFILTER:
/* Can be set only for TAPs */
ret = -EINVAL;
if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)
if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP)
break;
ret = 0;
tun_detach_filter(tun, tun->numqueues);
@ -2101,7 +2075,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
case TUNGETFILTER:
ret = -EINVAL;
if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)
if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP)
break;
ret = -EFAULT;
if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog)))
@ -2294,10 +2268,10 @@ static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info
strlcpy(info->version, DRV_VERSION, sizeof(info->version));
switch (tun->flags & TUN_TYPE_MASK) {
case TUN_TUN_DEV:
case IFF_TUN:
strlcpy(info->bus_info, "tun", sizeof(info->bus_info));
break;
case TUN_TAP_DEV:
case IFF_TAP:
strlcpy(info->bus_info, "tap", sizeof(info->bus_info));
break;
}

161
drivers/net/virtio_net.c
View File

@ -123,6 +123,9 @@ struct virtnet_info {
/* Host can handle any s/g split between our header and packet data */
bool any_header_sg;
/* Packet virtio header size */
u8 hdr_len;
/* Active statistics */
struct virtnet_stats __percpu *stats;
@ -139,21 +142,14 @@ struct virtnet_info {
struct notifier_block nb;
};
struct skb_vnet_hdr {
union {
struct virtio_net_hdr hdr;
struct virtio_net_hdr_mrg_rxbuf mhdr;
};
};
struct padded_vnet_hdr {
struct virtio_net_hdr hdr;
struct virtio_net_hdr_mrg_rxbuf hdr;
/*
* virtio_net_hdr should be in a separated sg buffer because of a
* QEMU bug, and data sg buffer shares same page with this header sg.
* This padding makes next sg 16 byte aligned after virtio_net_hdr.
* hdr is in a separate sg buffer, and data sg buffer shares same page
* with this header sg. This padding makes next sg 16 byte aligned
* after the header.
*/
char padding[6];
char padding[4];
};
/* Converting between virtqueue no. and kernel tx/rx queue no.
@ -179,9 +175,9 @@ static int rxq2vq(int rxq)
return rxq * 2;
}
static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb)
{
return (struct skb_vnet_hdr *)skb->cb;
return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb;
}
/*
@ -241,13 +237,13 @@ static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize)
}
/* Called from bottom half context */
static struct sk_buff *page_to_skb(struct receive_queue *rq,
static struct sk_buff *page_to_skb(struct virtnet_info *vi,
struct receive_queue *rq,
struct page *page, unsigned int offset,
unsigned int len, unsigned int truesize)
{
struct virtnet_info *vi = rq->vq->vdev->priv;
struct sk_buff *skb;
struct skb_vnet_hdr *hdr;
struct virtio_net_hdr_mrg_rxbuf *hdr;
unsigned int copy, hdr_len, hdr_padded_len;
char *p;
@ -260,13 +256,11 @@ static struct sk_buff *page_to_skb(struct receive_queue *rq,
hdr = skb_vnet_hdr(skb);
if (vi->mergeable_rx_bufs) {
hdr_len = sizeof hdr->mhdr;
hdr_padded_len = sizeof hdr->mhdr;
} else {
hdr_len = sizeof hdr->hdr;
hdr_len = vi->hdr_len;
if (vi->mergeable_rx_bufs)
hdr_padded_len = sizeof *hdr;
else
hdr_padded_len = sizeof(struct padded_vnet_hdr);
}
memcpy(hdr, p, hdr_len);
@ -317,23 +311,24 @@ static struct sk_buff *page_to_skb(struct receive_queue *rq,
return skb;
}
static struct sk_buff *receive_small(void *buf, unsigned int len)
static struct sk_buff *receive_small(struct virtnet_info *vi, void *buf, unsigned int len)
{
struct sk_buff * skb = buf;
len -= sizeof(struct virtio_net_hdr);
len -= vi->hdr_len;
skb_trim(skb, len);
return skb;
}
static struct sk_buff *receive_big(struct net_device *dev,
struct virtnet_info *vi,
struct receive_queue *rq,
void *buf,
unsigned int len)
{
struct page *page = buf;
struct sk_buff *skb = page_to_skb(rq, page, 0, len, PAGE_SIZE);
struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE);
if (unlikely(!skb))
goto err;
@ -347,18 +342,20 @@ err:
}
static struct sk_buff *receive_mergeable(struct net_device *dev,
struct virtnet_info *vi,
struct receive_queue *rq,
unsigned long ctx,
unsigned int len)
{
void *buf = mergeable_ctx_to_buf_address(ctx);
struct skb_vnet_hdr *hdr = buf;
int num_buf = hdr->mhdr.num_buffers;
struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
struct page *page = virt_to_head_page(buf);
int offset = buf - page_address(page);
unsigned int truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
struct sk_buff *head_skb = page_to_skb(rq, page, offset, len, truesize);
struct sk_buff *head_skb = page_to_skb(vi, rq, page, offset, len,
truesize);
struct sk_buff *curr_skb = head_skb;
if (unlikely(!curr_skb))
@ -369,7 +366,9 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
if (unlikely(!ctx)) {
pr_debug("%s: rx error: %d buffers out of %d missing\n",
dev->name, num_buf, hdr->mhdr.num_buffers);
dev->name, num_buf,
virtio16_to_cpu(vi->vdev,
hdr->num_buffers));
dev->stats.rx_length_errors++;
goto err_buf;
}
@ -430,15 +429,15 @@ err_buf:
return NULL;
}
static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
void *buf, unsigned int len)
{
struct virtnet_info *vi = rq->vq->vdev->priv;
struct net_device *dev = vi->dev;
struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
struct sk_buff *skb;
struct skb_vnet_hdr *hdr;
struct virtio_net_hdr_mrg_rxbuf *hdr;
if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
pr_debug("%s: short packet %i\n", dev->name, len);
dev->stats.rx_length_errors++;
if (vi->mergeable_rx_bufs) {
@ -454,11 +453,11 @@ static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
}
if (vi->mergeable_rx_bufs)
skb = receive_mergeable(dev, rq, (unsigned long)buf, len);
skb = receive_mergeable(dev, vi, rq, (unsigned long)buf, len);
else if (vi->big_packets)
skb = receive_big(dev, rq, buf, len);
skb = receive_big(dev, vi, rq, buf, len);
else
skb = receive_small(buf, len);
skb = receive_small(vi, buf, len);
if (unlikely(!skb))
return;
@ -473,8 +472,8 @@ static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
pr_debug("Needs csum!\n");
if (!skb_partial_csum_set(skb,
hdr->hdr.csum_start,
hdr->hdr.csum_offset))
virtio16_to_cpu(vi->vdev, hdr->hdr.csum_start),
virtio16_to_cpu(vi->vdev, hdr->hdr.csum_offset)))
goto frame_err;
} else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
@ -514,7 +513,8 @@ static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
skb_shinfo(skb)->gso_size = virtio16_to_cpu(vi->vdev,
hdr->hdr.gso_size);
if (skb_shinfo(skb)->gso_size == 0) {
net_warn_ratelimited("%s: zero gso size.\n", dev->name);
goto frame_err;
@ -535,11 +535,11 @@ frame_err:
dev_kfree_skb(skb);
}
static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp)
static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
gfp_t gfp)
{
struct virtnet_info *vi = rq->vq->vdev->priv;
struct sk_buff *skb;
struct skb_vnet_hdr *hdr;
struct virtio_net_hdr_mrg_rxbuf *hdr;
int err;
skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp);
@ -550,7 +550,7 @@ static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp)
hdr = skb_vnet_hdr(skb);
sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr);
sg_set_buf(rq->sg, hdr, vi->hdr_len);
skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp);
@ -560,7 +560,8 @@ static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp)
return err;
}
static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp)
static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
gfp_t gfp)
{
struct page *first, *list = NULL;
char *p;
@ -591,8 +592,8 @@ static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp)
p = page_address(first);
/* rq->sg[0], rq->sg[1] share the same page */
/* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */
sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr));
/* a separated rq->sg[0] for header - required in case !any_header_sg */
sg_set_buf(&rq->sg[0], p, vi->hdr_len);
/* rq->sg[1] for data packet, from offset */
offset = sizeof(struct padded_vnet_hdr);
@ -660,9 +661,9 @@ static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
* before we're receiving packets, or from refill_work which is
* careful to disable receiving (using napi_disable).
*/
static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp)
static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
gfp_t gfp)
{
struct virtnet_info *vi = rq->vq->vdev->priv;
int err;
bool oom;
@ -671,9 +672,9 @@ static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp)
if (vi->mergeable_rx_bufs)
err = add_recvbuf_mergeable(rq, gfp);
else if (vi->big_packets)
err = add_recvbuf_big(rq, gfp);
err = add_recvbuf_big(vi, rq, gfp);
else
err = add_recvbuf_small(rq, gfp);
err = add_recvbuf_small(vi, rq, gfp);
oom = err == -ENOMEM;
if (err)
@ -722,7 +723,7 @@ static void refill_work(struct work_struct *work)
struct receive_queue *rq = &vi->rq[i];
napi_disable(&rq->napi);
still_empty = !try_fill_recv(rq, GFP_KERNEL);
still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
virtnet_napi_enable(rq);
/* In theory, this can happen: if we don't get any buffers in
@ -741,12 +742,12 @@ static int virtnet_receive(struct receive_queue *rq, int budget)
while (received < budget &&
(buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
receive_buf(rq, buf, len);
receive_buf(vi, rq, buf, len);
received++;
}
if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) {
if (!try_fill_recv(rq, GFP_ATOMIC))
if (!try_fill_recv(vi, rq, GFP_ATOMIC))
schedule_delayed_work(&vi->refill, 0);
}
@ -822,7 +823,7 @@ static int virtnet_open(struct net_device *dev)
for (i = 0; i < vi->max_queue_pairs; i++) {
if (i < vi->curr_queue_pairs)
/* Make sure we have some buffers: if oom use wq. */
if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
schedule_delayed_work(&vi->refill, 0);
virtnet_napi_enable(&vi->rq[i]);
}
@ -851,18 +852,14 @@ static void free_old_xmit_skbs(struct send_queue *sq)
static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
{
struct skb_vnet_hdr *hdr;
struct virtio_net_hdr_mrg_rxbuf *hdr;
const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
struct virtnet_info *vi = sq->vq->vdev->priv;
unsigned num_sg;
unsigned hdr_len;
unsigned hdr_len = vi->hdr_len;
bool can_push;
pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
if (vi->mergeable_rx_bufs)
hdr_len = sizeof hdr->mhdr;
else
hdr_len = sizeof hdr->hdr;
can_push = vi->any_header_sg &&
!((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
@ -870,22 +867,25 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
/* Even if we can, don't push here yet as this would skew
* csum_start offset below. */
if (can_push)
hdr = (struct skb_vnet_hdr *)(skb->data - hdr_len);
hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
else
hdr = skb_vnet_hdr(skb);
if (skb->ip_summed == CHECKSUM_PARTIAL) {
hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
hdr->hdr.csum_start = skb_checksum_start_offset(skb);
hdr->hdr.csum_offset = skb->csum_offset;
hdr->hdr.csum_start = cpu_to_virtio16(vi->vdev,
skb_checksum_start_offset(skb));
hdr->hdr.csum_offset = cpu_to_virtio16(vi->vdev,
skb->csum_offset);
} else {
hdr->hdr.flags = 0;
hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
}
if (skb_is_gso(skb)) {
hdr->hdr.hdr_len = skb_headlen(skb);
hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
hdr->hdr.hdr_len = cpu_to_virtio16(vi->vdev, skb_headlen(skb));
hdr->hdr.gso_size = cpu_to_virtio16(vi->vdev,
skb_shinfo(skb)->gso_size);
if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
@ -900,7 +900,7 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
}
if (vi->mergeable_rx_bufs)
hdr->mhdr.num_buffers = 0;
hdr->num_buffers = 0;
sg_init_table(sq->sg, MAX_SKB_FRAGS + 2);
if (can_push) {
@ -1030,7 +1030,8 @@ static int virtnet_set_mac_address(struct net_device *dev, void *p)
"Failed to set mac address by vq command.\n");
return -EINVAL;
}
} else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
} else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
unsigned int i;
/* Naturally, this has an atomicity problem. */
@ -1112,7 +1113,7 @@ static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
return 0;
s.virtqueue_pairs = queue_pairs;
s.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
sg_init_one(&sg, &s, sizeof(s));
if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
@ -1189,7 +1190,7 @@ static void virtnet_set_rx_mode(struct net_device *dev)
sg_init_table(sg, 2);
/* Store the unicast list and count in the front of the buffer */
mac_data->entries = uc_count;
mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
i = 0;
netdev_for_each_uc_addr(ha, dev)
memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
@ -1200,7 +1201,7 @@ static void virtnet_set_rx_mode(struct net_device *dev)
/* multicast list and count fill the end */
mac_data = (void *)&mac_data->macs[uc_count][0];
mac_data->entries = mc_count;
mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
i = 0;
netdev_for_each_mc_addr(ha, dev)
memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
@ -1805,18 +1806,20 @@ static int virtnet_probe(struct virtio_device *vdev)
if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
vi->mergeable_rx_bufs = true;
if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
else
vi->hdr_len = sizeof(struct virtio_net_hdr);
if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT))
vi->any_header_sg = true;
if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
vi->has_cvq = true;
if (vi->any_header_sg) {
if (vi->mergeable_rx_bufs)
dev->needed_headroom = sizeof(struct virtio_net_hdr_mrg_rxbuf);
else
dev->needed_headroom = sizeof(struct virtio_net_hdr);
}
if (vi->any_header_sg)
dev->needed_headroom = vi->hdr_len;
/* Use single tx/rx queue pair as default */
vi->curr_queue_pairs = 1;
@ -1844,7 +1847,7 @@ static int virtnet_probe(struct virtio_device *vdev)
/* Last of all, set up some receive buffers. */
for (i = 0; i < vi->curr_queue_pairs; i++) {
try_fill_recv(&vi->rq[i], GFP_KERNEL);
try_fill_recv(vi, &vi->rq[i], GFP_KERNEL);
/* If we didn't even get one input buffer, we're useless. */
if (vi->rq[i].vq->num_free ==
@ -1964,7 +1967,7 @@ static int virtnet_restore(struct virtio_device *vdev)
if (netif_running(vi->dev)) {
for (i = 0; i < vi->curr_queue_pairs; i++)
if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
schedule_delayed_work(&vi->refill, 0);
for (i = 0; i < vi->max_queue_pairs; i++)

11
drivers/remoteproc/remoteproc_virtio.c
View File

@ -207,7 +207,7 @@ static void rproc_virtio_reset(struct virtio_device *vdev)
}
/* provide the vdev features as retrieved from the firmware */
static u32 rproc_virtio_get_features(struct virtio_device *vdev)
static u64 rproc_virtio_get_features(struct virtio_device *vdev)
{
struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
struct fw_rsc_vdev *rsc;
@ -217,7 +217,7 @@ static u32 rproc_virtio_get_features(struct virtio_device *vdev)
return rsc->dfeatures;
}
static void rproc_virtio_finalize_features(struct virtio_device *vdev)
static int rproc_virtio_finalize_features(struct virtio_device *vdev)
{
struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
struct fw_rsc_vdev *rsc;
@ -227,11 +227,16 @@ static void rproc_virtio_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features */
vring_transport_features(vdev);
/* Make sure we don't have any features > 32 bits! */
BUG_ON((u32)vdev->features != vdev->features);
/*
* Remember the finalized features of our vdev, and provide it
* to the remote processor once it is powered on.
*/
rsc->gfeatures = vdev->features[0];
rsc->gfeatures = vdev->features;
return 0;
}
static void rproc_virtio_get(struct virtio_device *vdev, unsigned offset,

11
drivers/s390/kvm/kvm_virtio.c
View File

@ -80,7 +80,7 @@ static unsigned desc_size(const struct kvm_device_desc *desc)
}
/* This gets the device's feature bits. */
static u32 kvm_get_features(struct virtio_device *vdev)
static u64 kvm_get_features(struct virtio_device *vdev)
{
unsigned int i;
u32 features = 0;
@ -93,7 +93,7 @@ static u32 kvm_get_features(struct virtio_device *vdev)
return features;
}
static void kvm_finalize_features(struct virtio_device *vdev)
static int kvm_finalize_features(struct virtio_device *vdev)
{
unsigned int i, bits;
struct kvm_device_desc *desc = to_kvmdev(vdev)->desc;
@ -103,12 +103,17 @@ static void kvm_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
/* Make sure we don't have any features > 32 bits! */
BUG_ON((u32)vdev->features != vdev->features);
memset(out_features, 0, desc->feature_len);
bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8;
for (i = 0; i < bits; i++) {
if (test_bit(i, vdev->features))
if (__virtio_test_bit(vdev, i))
out_features[i / 8] |= (1 << (i % 8));
}
return 0;
}
/*

203
drivers/s390/kvm/virtio_ccw.c
View File

@ -55,6 +55,7 @@ struct virtio_ccw_device {
struct ccw_device *cdev;
__u32 curr_io;
int err;
unsigned int revision; /* Transport revision */
wait_queue_head_t wait_q;
spinlock_t lock;
struct list_head virtqueues;
@ -67,13 +68,22 @@ struct virtio_ccw_device {
void *airq_info;
};
struct vq_info_block {
struct vq_info_block_legacy {
__u64 queue;
__u32 align;
__u16 index;
__u16 num;
} __packed;
struct vq_info_block {
__u64 desc;
__u32 res0;
__u16 index;
__u16 num;
__u64 avail;
__u64 used;
} __packed;
struct virtio_feature_desc {
__u32 features;
__u8 index;
@ -86,11 +96,23 @@ struct virtio_thinint_area {
u8 isc;
} __packed;
struct virtio_rev_info {
__u16 revision;
__u16 length;
__u8 data[];
};
/* the highest virtio-ccw revision we support */
#define VIRTIO_CCW_REV_MAX 1
struct virtio_ccw_vq_info {
struct virtqueue *vq;
int num;
void *queue;
struct vq_info_block *info_block;
union {
struct vq_info_block s;
struct vq_info_block_legacy l;
} *info_block;
int bit_nr;
struct list_head node;
long cookie;
@ -122,6 +144,7 @@ static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
#define CCW_CMD_WRITE_STATUS 0x31
#define CCW_CMD_READ_VQ_CONF 0x32
#define CCW_CMD_SET_IND_ADAPTER 0x73
#define CCW_CMD_SET_VIRTIO_REV 0x83
#define VIRTIO_CCW_DOING_SET_VQ 0x00010000
#define VIRTIO_CCW_DOING_RESET 0x00040000
@ -134,6 +157,7 @@ static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
#define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
#define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
#define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000
#define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000
#define VIRTIO_CCW_INTPARM_MASK 0xffff0000
static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev)
@ -399,13 +423,22 @@ static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
spin_unlock_irqrestore(&vcdev->lock, flags);
/* Release from host. */
info->info_block->queue = 0;
info->info_block->align = 0;
info->info_block->index = index;
info->info_block->num = 0;
if (vcdev->revision == 0) {
info->info_block->l.queue = 0;
info->info_block->l.align = 0;
info->info_block->l.index = index;
info->info_block->l.num = 0;
ccw->count = sizeof(info->info_block->l);
} else {
info->info_block->s.desc = 0;
info->info_block->s.index = index;
info->info_block->s.num = 0;
info->info_block->s.avail = 0;
info->info_block->s.used = 0;
ccw->count = sizeof(info->info_block->s);
}
ccw->cmd_code = CCW_CMD_SET_VQ;
ccw->flags = 0;
ccw->count = sizeof(*info->info_block);
ccw->cda = (__u32)(unsigned long)(info->info_block);
ret = ccw_io_helper(vcdev, ccw,
VIRTIO_CCW_DOING_SET_VQ | index);
@ -488,13 +521,22 @@ static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
}
/* Register it with the host. */
info->info_block->queue = (__u64)info->queue;
info->info_block->align = KVM_VIRTIO_CCW_RING_ALIGN;
info->info_block->index = i;
info->info_block->num = info->num;
if (vcdev->revision == 0) {
info->info_block->l.queue = (__u64)info->queue;
info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
info->info_block->l.index = i;
info->info_block->l.num = info->num;
ccw->count = sizeof(info->info_block->l);
} else {
info->info_block->s.desc = (__u64)info->queue;
info->info_block->s.index = i;
info->info_block->s.num = info->num;
info->info_block->s.avail = (__u64)virtqueue_get_avail(vq);
info->info_block->s.used = (__u64)virtqueue_get_used(vq);
ccw->count = sizeof(info->info_block->s);
}
ccw->cmd_code = CCW_CMD_SET_VQ;
ccw->flags = 0;
ccw->count = sizeof(*info->info_block);
ccw->cda = (__u32)(unsigned long)(info->info_block);
err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
if (err) {
@ -660,11 +702,12 @@ static void virtio_ccw_reset(struct virtio_device *vdev)
kfree(ccw);
}
static u32 virtio_ccw_get_features(struct virtio_device *vdev)
static u64 virtio_ccw_get_features(struct virtio_device *vdev)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
struct virtio_feature_desc *features;
int ret, rc;
int ret;
u64 rc;
struct ccw1 *ccw;
ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
@ -677,7 +720,6 @@ static u32 virtio_ccw_get_features(struct virtio_device *vdev)
goto out_free;
}
/* Read the feature bits from the host. */
/* TODO: Features > 32 bits */
features->index = 0;
ccw->cmd_code = CCW_CMD_READ_FEAT;
ccw->flags = 0;
@ -691,46 +733,79 @@ static u32 virtio_ccw_get_features(struct virtio_device *vdev)
rc = le32_to_cpu(features->features);
if (vcdev->revision == 0)
goto out_free;
/* Read second half of the feature bits from the host. */
features->index = 1;
ccw->cmd_code = CCW_CMD_READ_FEAT;
ccw->flags = 0;
ccw->count = sizeof(*features);
ccw->cda = (__u32)(unsigned long)features;
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
if (ret == 0)
rc |= (u64)le32_to_cpu(features->features) << 32;
out_free:
kfree(features);
kfree(ccw);
return rc;
}
static void virtio_ccw_finalize_features(struct virtio_device *vdev)
static int virtio_ccw_finalize_features(struct virtio_device *vdev)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
struct virtio_feature_desc *features;
int i;
struct ccw1 *ccw;
int ret;
if (vcdev->revision >= 1 &&
!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
dev_err(&vdev->dev, "virtio: device uses revision 1 "
"but does not have VIRTIO_F_VERSION_1\n");
return -EINVAL;
}
ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
if (!ccw)
return;
return -ENOMEM;
features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
if (!features)
if (!features) {
ret = -ENOMEM;
goto out_free;
}
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
for (i = 0; i < sizeof(*vdev->features) / sizeof(features->features);
i++) {
int highbits = i % 2 ? 32 : 0;
features->index = i;
features->features = cpu_to_le32(vdev->features[i / 2]
>> highbits);
/* Write the feature bits to the host. */
ccw->cmd_code = CCW_CMD_WRITE_FEAT;
ccw->flags = 0;
ccw->count = sizeof(*features);
ccw->cda = (__u32)(unsigned long)features;
ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
}
features->index = 0;
features->features = cpu_to_le32((u32)vdev->features);
/* Write the first half of the feature bits to the host. */
ccw->cmd_code = CCW_CMD_WRITE_FEAT;
ccw->flags = 0;
ccw->count = sizeof(*features);
ccw->cda = (__u32)(unsigned long)features;
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
if (ret)
goto out_free;
if (vcdev->revision == 0)
goto out_free;
features->index = 1;
features->features = cpu_to_le32(vdev->features >> 32);
/* Write the second half of the feature bits to the host. */
ccw->cmd_code = CCW_CMD_WRITE_FEAT;
ccw->flags = 0;
ccw->count = sizeof(*features);
ccw->cda = (__u32)(unsigned long)features;
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
out_free:
kfree(features);
kfree(ccw);
return ret;
}
static void virtio_ccw_get_config(struct virtio_device *vdev,
@ -806,7 +881,9 @@ static u8 virtio_ccw_get_status(struct virtio_device *vdev)
static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
u8 old_status = *vcdev->status;
struct ccw1 *ccw;
int ret;
ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
if (!ccw)
@ -818,7 +895,10 @@ static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
ccw->flags = 0;
ccw->count = sizeof(status);
ccw->cda = (__u32)(unsigned long)vcdev->status;
ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
/* Write failed? We assume status is unchanged. */
if (ret)
*vcdev->status = old_status;
kfree(ccw);
}
@ -919,6 +999,7 @@ static void virtio_ccw_int_handler(struct ccw_device *cdev,
case VIRTIO_CCW_DOING_RESET:
case VIRTIO_CCW_DOING_READ_VQ_CONF:
case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
vcdev->curr_io &= ~activity;
wake_up(&vcdev->wait_q);
break;
@ -1034,6 +1115,51 @@ static int virtio_ccw_offline(struct ccw_device *cdev)
return 0;
}
static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
{
struct virtio_rev_info *rev;
struct ccw1 *ccw;
int ret;
ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
if (!ccw)
return -ENOMEM;
rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL);
if (!rev) {
kfree(ccw);
return -ENOMEM;
}
/* Set transport revision */
ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
ccw->flags = 0;
ccw->count = sizeof(*rev);
ccw->cda = (__u32)(unsigned long)rev;
vcdev->revision = VIRTIO_CCW_REV_MAX;
do {
rev->revision = vcdev->revision;
/* none of our supported revisions carry payload */
rev->length = 0;
ret = ccw_io_helper(vcdev, ccw,
VIRTIO_CCW_DOING_SET_VIRTIO_REV);
if (ret == -EOPNOTSUPP) {
if (vcdev->revision == 0)
/*
* The host device does not support setting
* the revision: let's operate it in legacy
* mode.
*/
ret = 0;
else
vcdev->revision--;
}
} while (ret == -EOPNOTSUPP);
kfree(ccw);
kfree(rev);
return ret;
}
static int virtio_ccw_online(struct ccw_device *cdev)
{
@ -1074,6 +1200,15 @@ static int virtio_ccw_online(struct ccw_device *cdev)
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
vcdev->vdev.id.vendor = cdev->id.cu_type;
vcdev->vdev.id.device = cdev->id.cu_model;
if (virtio_device_is_legacy_only(vcdev->vdev.id)) {
vcdev->revision = 0;
} else {
ret = virtio_ccw_set_transport_rev(vcdev);
if (ret)
goto out_free;
}
ret = register_virtio_device(&vcdev->vdev);
if (ret) {
dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",

50
drivers/scsi/virtio_scsi.c
View File

@ -158,7 +158,7 @@ static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf)
sc, resp->response, resp->status, resp->sense_len);
sc->result = resp->status;
virtscsi_compute_resid(sc, resp->resid);
virtscsi_compute_resid(sc, virtio32_to_cpu(vscsi->vdev, resp->resid));
switch (resp->response) {
case VIRTIO_SCSI_S_OK:
set_host_byte(sc, DID_OK);
@ -196,10 +196,13 @@ static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf)
break;
}
WARN_ON(resp->sense_len > VIRTIO_SCSI_SENSE_SIZE);
WARN_ON(virtio32_to_cpu(vscsi->vdev, resp->sense_len) >
VIRTIO_SCSI_SENSE_SIZE);
if (sc->sense_buffer) {
memcpy(sc->sense_buffer, resp->sense,
min_t(u32, resp->sense_len, VIRTIO_SCSI_SENSE_SIZE));
min_t(u32,
virtio32_to_cpu(vscsi->vdev, resp->sense_len),
VIRTIO_SCSI_SENSE_SIZE));
if (resp->sense_len)
set_driver_byte(sc, DRIVER_SENSE);
}
@ -323,7 +326,7 @@ static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi,
unsigned int target = event->lun[1];
unsigned int lun = (event->lun[2] << 8) | event->lun[3];
switch (event->reason) {
switch (virtio32_to_cpu(vscsi->vdev, event->reason)) {
case VIRTIO_SCSI_EVT_RESET_RESCAN:
scsi_add_device(shost, 0, target, lun);
break;
@ -349,8 +352,8 @@ static void virtscsi_handle_param_change(struct virtio_scsi *vscsi,
struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
unsigned int target = event->lun[1];
unsigned int lun = (event->lun[2] << 8) | event->lun[3];
u8 asc = event->reason & 255;
u8 ascq = event->reason >> 8;
u8 asc = virtio32_to_cpu(vscsi->vdev, event->reason) & 255;
u8 ascq = virtio32_to_cpu(vscsi->vdev, event->reason) >> 8;
sdev = scsi_device_lookup(shost, 0, target, lun);
if (!sdev) {
@ -374,12 +377,14 @@ static void virtscsi_handle_event(struct work_struct *work)
struct virtio_scsi *vscsi = event_node->vscsi;
struct virtio_scsi_event *event = &event_node->event;
if (event->event & VIRTIO_SCSI_T_EVENTS_MISSED) {
event->event &= ~VIRTIO_SCSI_T_EVENTS_MISSED;
if (event->event &
cpu_to_virtio32(vscsi->vdev, VIRTIO_SCSI_T_EVENTS_MISSED)) {
event->event &= ~cpu_to_virtio32(vscsi->vdev,
VIRTIO_SCSI_T_EVENTS_MISSED);
scsi_scan_host(virtio_scsi_host(vscsi->vdev));
}
switch (event->event) {
switch (virtio32_to_cpu(vscsi->vdev, event->event)) {
case VIRTIO_SCSI_T_NO_EVENT:
break;
case VIRTIO_SCSI_T_TRANSPORT_RESET:
@ -482,26 +487,28 @@ static int virtscsi_kick_cmd(struct virtio_scsi_vq *vq,
return err;
}
static void virtio_scsi_init_hdr(struct virtio_scsi_cmd_req *cmd,
static void virtio_scsi_init_hdr(struct virtio_device *vdev,
struct virtio_scsi_cmd_req *cmd,
struct scsi_cmnd *sc)
{
cmd->lun[0] = 1;
cmd->lun[1] = sc->device->id;
cmd->lun[2] = (sc->device->lun >> 8) | 0x40;
cmd->lun[3] = sc->device->lun & 0xff;
cmd->tag = (unsigned long)sc;
cmd->tag = cpu_to_virtio64(vdev, (unsigned long)sc);
cmd->task_attr = VIRTIO_SCSI_S_SIMPLE;
cmd->prio = 0;
cmd->crn = 0;
}
static void virtio_scsi_init_hdr_pi(struct virtio_scsi_cmd_req_pi *cmd_pi,
static void virtio_scsi_init_hdr_pi(struct virtio_device *vdev,
struct virtio_scsi_cmd_req_pi *cmd_pi,
struct scsi_cmnd *sc)
{
struct request *rq = sc->request;
struct blk_integrity *bi;
virtio_scsi_init_hdr((struct virtio_scsi_cmd_req *)cmd_pi, sc);
virtio_scsi_init_hdr(vdev, (struct virtio_scsi_cmd_req *)cmd_pi, sc);
if (!rq || !scsi_prot_sg_count(sc))
return;
@ -509,9 +516,13 @@ static void virtio_scsi_init_hdr_pi(struct virtio_scsi_cmd_req_pi *cmd_pi,
bi = blk_get_integrity(rq->rq_disk);
if (sc->sc_data_direction == DMA_TO_DEVICE)
cmd_pi->pi_bytesout = blk_rq_sectors(rq) * bi->tuple_size;
cmd_pi->pi_bytesout = cpu_to_virtio32(vdev,
blk_rq_sectors(rq) *
bi->tuple_size);
else if (sc->sc_data_direction == DMA_FROM_DEVICE)
cmd_pi->pi_bytesin = blk_rq_sectors(rq) * bi->tuple_size;
cmd_pi->pi_bytesin = cpu_to_virtio32(vdev,
blk_rq_sectors(rq) *
bi->tuple_size);
}
static int virtscsi_queuecommand(struct virtio_scsi *vscsi,
@ -536,11 +547,11 @@ static int virtscsi_queuecommand(struct virtio_scsi *vscsi,
BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE);
if (virtio_has_feature(vscsi->vdev, VIRTIO_SCSI_F_T10_PI)) {
virtio_scsi_init_hdr_pi(&cmd->req.cmd_pi, sc);
virtio_scsi_init_hdr_pi(vscsi->vdev, &cmd->req.cmd_pi, sc);
memcpy(cmd->req.cmd_pi.cdb, sc->cmnd, sc->cmd_len);
req_size = sizeof(cmd->req.cmd_pi);
} else {
virtio_scsi_init_hdr(&cmd->req.cmd, sc);
virtio_scsi_init_hdr(vscsi->vdev, &cmd->req.cmd, sc);
memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len);
req_size = sizeof(cmd->req.cmd);
}
@ -669,7 +680,8 @@ static int virtscsi_device_reset(struct scsi_cmnd *sc)
cmd->sc = sc;
cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){
.type = VIRTIO_SCSI_T_TMF,
.subtype = VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET,
.subtype = cpu_to_virtio32(vscsi->vdev,
VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET),
.lun[0] = 1,
.lun[1] = sc->device->id,
.lun[2] = (sc->device->lun >> 8) | 0x40,
@ -710,7 +722,7 @@ static int virtscsi_abort(struct scsi_cmnd *sc)
.lun[1] = sc->device->id,
.lun[2] = (sc->device->lun >> 8) | 0x40,
.lun[3] = sc->device->lun & 0xff,
.tag = (unsigned long)sc,
.tag = cpu_to_virtio64(vscsi->vdev, (unsigned long)sc),
};
return virtscsi_tmf(vscsi, cmd);
}

31
drivers/vhost/net.c
View File

@ -48,20 +48,21 @@ MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;"
* status internally; used for zerocopy tx only.
*/
/* Lower device DMA failed */
#define VHOST_DMA_FAILED_LEN 3
#define VHOST_DMA_FAILED_LEN ((__force __virtio32)3)
/* Lower device DMA done */
#define VHOST_DMA_DONE_LEN 2
#define VHOST_DMA_DONE_LEN ((__force __virtio32)2)
/* Lower device DMA in progress */
#define VHOST_DMA_IN_PROGRESS 1
#define VHOST_DMA_IN_PROGRESS ((__force __virtio32)1)
/* Buffer unused */
#define VHOST_DMA_CLEAR_LEN 0
#define VHOST_DMA_CLEAR_LEN ((__force __virtio32)0)
#define VHOST_DMA_IS_DONE(len) ((len) >= VHOST_DMA_DONE_LEN)
#define VHOST_DMA_IS_DONE(len) ((__force u32)(len) >= (__force u32)VHOST_DMA_DONE_LEN)
enum {
VHOST_NET_FEATURES = VHOST_FEATURES |
(1ULL << VHOST_NET_F_VIRTIO_NET_HDR) |
(1ULL << VIRTIO_NET_F_MRG_RXBUF),
(1ULL << VIRTIO_NET_F_MRG_RXBUF) |
(1ULL << VIRTIO_F_VERSION_1),
};
enum {
@ -416,7 +417,7 @@ static void handle_tx(struct vhost_net *net)
struct ubuf_info *ubuf;
ubuf = nvq->ubuf_info + nvq->upend_idx;
vq->heads[nvq->upend_idx].id = head;
vq->heads[nvq->upend_idx].id = cpu_to_vhost32(vq, head);
vq->heads[nvq->upend_idx].len = VHOST_DMA_IN_PROGRESS;
ubuf->callback = vhost_zerocopy_callback;
ubuf->ctx = nvq->ubufs;
@ -500,6 +501,10 @@ static int get_rx_bufs(struct vhost_virtqueue *vq,
int headcount = 0;
unsigned d;
int r, nlogs = 0;
/* len is always initialized before use since we are always called with
* datalen > 0.
*/
u32 uninitialized_var(len);
while (datalen > 0 && headcount < quota) {
if (unlikely(seg >= UIO_MAXIOV)) {
@ -527,13 +532,14 @@ static int get_rx_bufs(struct vhost_virtqueue *vq,
nlogs += *log_num;
log += *log_num;
}
heads[headcount].id = d;
heads[headcount].len = iov_length(vq->iov + seg, in);
datalen -= heads[headcount].len;
heads[headcount].id = cpu_to_vhost32(vq, d);
len = iov_length(vq->iov + seg, in);
heads[headcount].len = cpu_to_vhost32(vq, len);
datalen -= len;
++headcount;
seg += in;
}
heads[headcount - 1].len += datalen;
heads[headcount - 1].len = cpu_to_vhost32(vq, len - datalen);
*iovcount = seg;
if (unlikely(log))
*log_num = nlogs;
@ -1025,7 +1031,8 @@ static int vhost_net_set_features(struct vhost_net *n, u64 features)
size_t vhost_hlen, sock_hlen, hdr_len;
int i;
hdr_len = (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ?
hdr_len = (features & ((1ULL << VIRTIO_NET_F_MRG_RXBUF) |
(1ULL << VIRTIO_F_VERSION_1))) ?
sizeof(struct virtio_net_hdr_mrg_rxbuf) :
sizeof(struct virtio_net_hdr);
if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) {

22
drivers/vhost/scsi.c
View File

@ -168,6 +168,7 @@ enum {
VHOST_SCSI_VQ_IO = 2,
};
/* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */
enum {
VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
(1ULL << VIRTIO_SCSI_F_T10_PI)
@ -577,8 +578,8 @@ tcm_vhost_allocate_evt(struct vhost_scsi *vs,
return NULL;
}
evt->event.event = event;
evt->event.reason = reason;
evt->event.event = cpu_to_vhost32(vq, event);
evt->event.reason = cpu_to_vhost32(vq, reason);
vs->vs_events_nr++;
return evt;
@ -636,7 +637,7 @@ again:
}
if (vs->vs_events_missed) {
event->event |= VIRTIO_SCSI_T_EVENTS_MISSED;
event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
vs->vs_events_missed = false;
}
@ -695,12 +696,13 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
cmd, se_cmd->residual_count, se_cmd->scsi_status);
memset(&v_rsp, 0, sizeof(v_rsp));
v_rsp.resid = se_cmd->residual_count;
v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count);
/* TODO is status_qualifier field needed? */
v_rsp.status = se_cmd->scsi_status;
v_rsp.sense_len = se_cmd->scsi_sense_length;
v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
se_cmd->scsi_sense_length);
memcpy(v_rsp.sense, cmd->tvc_sense_buf,
v_rsp.sense_len);
se_cmd->scsi_sense_length);
ret = copy_to_user(cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
if (likely(ret == 0)) {
struct vhost_scsi_virtqueue *q;
@ -1095,14 +1097,14 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
", but wrong data_direction\n");
goto err_cmd;
}
prot_bytes = v_req_pi.pi_bytesout;
prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
} else if (v_req_pi.pi_bytesin) {
if (data_direction != DMA_FROM_DEVICE) {
vq_err(vq, "Received non zero di_pi_niov"
", but wrong data_direction\n");
goto err_cmd;
}
prot_bytes = v_req_pi.pi_bytesin;
prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
}
if (prot_bytes) {
int tmp = 0;
@ -1117,12 +1119,12 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
data_first += prot_niov;
data_niov = data_num - prot_niov;
}
tag = v_req_pi.tag;
tag = vhost64_to_cpu(vq, v_req_pi.tag);
task_attr = v_req_pi.task_attr;
cdb = &v_req_pi.cdb[0];
lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
} else {
tag = v_req.tag;
tag = vhost64_to_cpu(vq, v_req.tag);
task_attr = v_req.task_attr;
cdb = &v_req.cdb[0];
lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;

93
drivers/vhost/vhost.c
View File

@ -33,8 +33,8 @@ enum {
VHOST_MEMORY_F_LOG = 0x1,
};
#define vhost_used_event(vq) ((u16 __user *)&vq->avail->ring[vq->num])
#define vhost_avail_event(vq) ((u16 __user *)&vq->used->ring[vq->num])
#define vhost_used_event(vq) ((__virtio16 __user *)&vq->avail->ring[vq->num])
#define vhost_avail_event(vq) ((__virtio16 __user *)&vq->used->ring[vq->num])
static void vhost_poll_func(struct file *file, wait_queue_head_t *wqh,
poll_table *pt)
@ -1001,7 +1001,7 @@ EXPORT_SYMBOL_GPL(vhost_log_write);
static int vhost_update_used_flags(struct vhost_virtqueue *vq)
{
void __user *used;
if (__put_user(vq->used_flags, &vq->used->flags) < 0)
if (__put_user(cpu_to_vhost16(vq, vq->used_flags), &vq->used->flags) < 0)
return -EFAULT;
if (unlikely(vq->log_used)) {
/* Make sure the flag is seen before log. */
@ -1019,7 +1019,7 @@ static int vhost_update_used_flags(struct vhost_virtqueue *vq)
static int vhost_update_avail_event(struct vhost_virtqueue *vq, u16 avail_event)
{
if (__put_user(vq->avail_idx, vhost_avail_event(vq)))
if (__put_user(cpu_to_vhost16(vq, vq->avail_idx), vhost_avail_event(vq)))
return -EFAULT;
if (unlikely(vq->log_used)) {
void __user *used;
@ -1038,6 +1038,7 @@ static int vhost_update_avail_event(struct vhost_virtqueue *vq, u16 avail_event)
int vhost_init_used(struct vhost_virtqueue *vq)
{
__virtio16 last_used_idx;
int r;
if (!vq->private_data)
return 0;
@ -1046,7 +1047,13 @@ int vhost_init_used(struct vhost_virtqueue *vq)
if (r)
return r;
vq->signalled_used_valid = false;
return get_user(vq->last_used_idx, &vq->used->idx);
if (!access_ok(VERIFY_READ, &vq->used->idx, sizeof vq->used->idx))
return -EFAULT;
r = __get_user(last_used_idx, &vq->used->idx);
if (r)
return r;
vq->last_used_idx = vhost16_to_cpu(vq, last_used_idx);
return 0;
}
EXPORT_SYMBOL_GPL(vhost_init_used);
@ -1087,16 +1094,16 @@ static int translate_desc(struct vhost_virtqueue *vq, u64 addr, u32 len,
/* Each buffer in the virtqueues is actually a chain of descriptors. This
* function returns the next descriptor in the chain,
* or -1U if we're at the end. */
static unsigned next_desc(struct vring_desc *desc)
static unsigned next_desc(struct vhost_virtqueue *vq, struct vring_desc *desc)
{
unsigned int next;
/* If this descriptor says it doesn't chain, we're done. */
if (!(desc->flags & VRING_DESC_F_NEXT))
if (!(desc->flags & cpu_to_vhost16(vq, VRING_DESC_F_NEXT)))
return -1U;
/* Check they're not leading us off end of descriptors. */
next = desc->next;
next = vhost16_to_cpu(vq, desc->next);
/* Make sure compiler knows to grab that: we don't want it changing! */
/* We will use the result as an index in an array, so most
* architectures only need a compiler barrier here. */
@ -1113,18 +1120,19 @@ static int get_indirect(struct vhost_virtqueue *vq,
{
struct vring_desc desc;
unsigned int i = 0, count, found = 0;
u32 len = vhost32_to_cpu(vq, indirect->len);
int ret;
/* Sanity check */
if (unlikely(indirect->len % sizeof desc)) {
if (unlikely(len % sizeof desc)) {
vq_err(vq, "Invalid length in indirect descriptor: "
"len 0x%llx not multiple of 0x%zx\n",
(unsigned long long)indirect->len,
(unsigned long long)len,
sizeof desc);
return -EINVAL;
}
ret = translate_desc(vq, indirect->addr, indirect->len, vq->indirect,
ret = translate_desc(vq, vhost64_to_cpu(vq, indirect->addr), len, vq->indirect,
UIO_MAXIOV);
if (unlikely(ret < 0)) {
vq_err(vq, "Translation failure %d in indirect.\n", ret);
@ -1135,7 +1143,7 @@ static int get_indirect(struct vhost_virtqueue *vq,
* architectures only need a compiler barrier here. */
read_barrier_depends();
count = indirect->len / sizeof desc;
count = len / sizeof desc;
/* Buffers are chained via a 16 bit next field, so
* we can have at most 2^16 of these. */
if (unlikely(count > USHRT_MAX + 1)) {
@ -1155,16 +1163,17 @@ static int get_indirect(struct vhost_virtqueue *vq,
if (unlikely(memcpy_fromiovec((unsigned char *)&desc,
vq->indirect, sizeof desc))) {
vq_err(vq, "Failed indirect descriptor: idx %d, %zx\n",
i, (size_t)indirect->addr + i * sizeof desc);
i, (size_t)vhost64_to_cpu(vq, indirect->addr) + i * sizeof desc);
return -EINVAL;
}
if (unlikely(desc.flags & VRING_DESC_F_INDIRECT)) {
if (unlikely(desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_INDIRECT))) {
vq_err(vq, "Nested indirect descriptor: idx %d, %zx\n",
i, (size_t)indirect->addr + i * sizeof desc);
i, (size_t)vhost64_to_cpu(vq, indirect->addr) + i * sizeof desc);
return -EINVAL;
}
ret = translate_desc(vq, desc.addr, desc.len, iov + iov_count,
ret = translate_desc(vq, vhost64_to_cpu(vq, desc.addr),
vhost32_to_cpu(vq, desc.len), iov + iov_count,
iov_size - iov_count);
if (unlikely(ret < 0)) {
vq_err(vq, "Translation failure %d indirect idx %d\n",
@ -1172,11 +1181,11 @@ static int get_indirect(struct vhost_virtqueue *vq,
return ret;
}
/* If this is an input descriptor, increment that count. */
if (desc.flags & VRING_DESC_F_WRITE) {
if (desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_WRITE)) {
*in_num += ret;
if (unlikely(log)) {
log[*log_num].addr = desc.addr;
log[*log_num].len = desc.len;
log[*log_num].addr = vhost64_to_cpu(vq, desc.addr);
log[*log_num].len = vhost32_to_cpu(vq, desc.len);
++*log_num;
}
} else {
@ -1189,7 +1198,7 @@ static int get_indirect(struct vhost_virtqueue *vq,
}
*out_num += ret;
}
} while ((i = next_desc(&desc)) != -1);
} while ((i = next_desc(vq, &desc)) != -1);
return 0;
}
@ -1209,15 +1218,18 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
struct vring_desc desc;
unsigned int i, head, found = 0;
u16 last_avail_idx;
__virtio16 avail_idx;
__virtio16 ring_head;
int ret;
/* Check it isn't doing very strange things with descriptor numbers. */
last_avail_idx = vq->last_avail_idx;
if (unlikely(__get_user(vq->avail_idx, &vq->avail->idx))) {
if (unlikely(__get_user(avail_idx, &vq->avail->idx))) {
vq_err(vq, "Failed to access avail idx at %p\n",
&vq->avail->idx);
return -EFAULT;
}
vq->avail_idx = vhost16_to_cpu(vq, avail_idx);
if (unlikely((u16)(vq->avail_idx - last_avail_idx) > vq->num)) {
vq_err(vq, "Guest moved used index from %u to %u",
@ -1234,7 +1246,7 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
/* Grab the next descriptor number they're advertising, and increment
* the index we've seen. */
if (unlikely(__get_user(head,
if (unlikely(__get_user(ring_head,
&vq->avail->ring[last_avail_idx % vq->num]))) {
vq_err(vq, "Failed to read head: idx %d address %p\n",
last_avail_idx,
@ -1242,6 +1254,8 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
return -EFAULT;
}
head = vhost16_to_cpu(vq, ring_head);
/* If their number is silly, that's an error. */
if (unlikely(head >= vq->num)) {
vq_err(vq, "Guest says index %u > %u is available",
@ -1274,7 +1288,7 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
i, vq->desc + i);
return -EFAULT;
}
if (desc.flags & VRING_DESC_F_INDIRECT) {
if (desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_INDIRECT)) {
ret = get_indirect(vq, iov, iov_size,
out_num, in_num,
log, log_num, &desc);
@ -1286,20 +1300,21 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
continue;
}
ret = translate_desc(vq, desc.addr, desc.len, iov + iov_count,
ret = translate_desc(vq, vhost64_to_cpu(vq, desc.addr),
vhost32_to_cpu(vq, desc.len), iov + iov_count,
iov_size - iov_count);
if (unlikely(ret < 0)) {
vq_err(vq, "Translation failure %d descriptor idx %d\n",
ret, i);
return ret;
}
if (desc.flags & VRING_DESC_F_WRITE) {
if (desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_WRITE)) {
/* If this is an input descriptor,
* increment that count. */
*in_num += ret;
if (unlikely(log)) {
log[*log_num].addr = desc.addr;
log[*log_num].len = desc.len;
log[*log_num].addr = vhost64_to_cpu(vq, desc.addr);
log[*log_num].len = vhost32_to_cpu(vq, desc.len);
++*log_num;
}
} else {
@ -1312,7 +1327,7 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
}
*out_num += ret;
}
} while ((i = next_desc(&desc)) != -1);
} while ((i = next_desc(vq, &desc)) != -1);
/* On success, increment avail index. */
vq->last_avail_idx++;
@ -1335,7 +1350,10 @@ EXPORT_SYMBOL_GPL(vhost_discard_vq_desc);
* want to notify the guest, using eventfd. */
int vhost_add_used(struct vhost_virtqueue *vq, unsigned int head, int len)
{
struct vring_used_elem heads = { head, len };
struct vring_used_elem heads = {
cpu_to_vhost32(vq, head),
cpu_to_vhost32(vq, len)
};
return vhost_add_used_n(vq, &heads, 1);
}
@ -1404,7 +1422,7 @@ int vhost_add_used_n(struct vhost_virtqueue *vq, struct vring_used_elem *heads,
/* Make sure buffer is written before we update index. */
smp_wmb();
if (put_user(vq->last_used_idx, &vq->used->idx)) {
if (__put_user(cpu_to_vhost16(vq, vq->last_used_idx), &vq->used->idx)) {
vq_err(vq, "Failed to increment used idx");
return -EFAULT;
}
@ -1422,7 +1440,8 @@ EXPORT_SYMBOL_GPL(vhost_add_used_n);
static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
{
__u16 old, new, event;
__u16 old, new;
__virtio16 event;
bool v;
/* Flush out used index updates. This is paired
* with the barrier that the Guest executes when enabling
@ -1434,12 +1453,12 @@ static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
return true;
if (!vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX)) {
__u16 flags;
__virtio16 flags;
if (__get_user(flags, &vq->avail->flags)) {
vq_err(vq, "Failed to get flags");
return true;
}
return !(flags & VRING_AVAIL_F_NO_INTERRUPT);
return !(flags & cpu_to_vhost16(vq, VRING_AVAIL_F_NO_INTERRUPT));
}
old = vq->signalled_used;
v = vq->signalled_used_valid;
@ -1449,11 +1468,11 @@ static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
if (unlikely(!v))
return true;
if (get_user(event, vhost_used_event(vq))) {
if (__get_user(event, vhost_used_event(vq))) {
vq_err(vq, "Failed to get used event idx");
return true;
}
return vring_need_event(event, new, old);
return vring_need_event(vhost16_to_cpu(vq, event), new, old);
}
/* This actually signals the guest, using eventfd. */
@ -1488,7 +1507,7 @@ EXPORT_SYMBOL_GPL(vhost_add_used_and_signal_n);
/* OK, now we need to know about added descriptors. */
bool vhost_enable_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
{
u16 avail_idx;
__virtio16 avail_idx;
int r;
if (!(vq->used_flags & VRING_USED_F_NO_NOTIFY))
@ -1519,7 +1538,7 @@ bool vhost_enable_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
return false;
}
return avail_idx != vq->avail_idx;
return vhost16_to_cpu(vq, avail_idx) != vq->avail_idx;
}
EXPORT_SYMBOL_GPL(vhost_enable_notify);

41
drivers/vhost/vhost.h
View File

@ -12,8 +12,6 @@
#include <linux/virtio_ring.h>
#include <linux/atomic.h>
struct vhost_device;
struct vhost_work;
typedef void (*vhost_work_fn_t)(struct vhost_work *work);
@ -54,8 +52,6 @@ struct vhost_log {
u64 len;
};
struct vhost_virtqueue;
/* The virtqueue structure describes a queue attached to a device. */
struct vhost_virtqueue {
struct vhost_dev *dev;
@ -106,7 +102,7 @@ struct vhost_virtqueue {
/* Protected by virtqueue mutex. */
struct vhost_memory *memory;
void *private_data;
unsigned acked_features;
u64 acked_features;
/* Log write descriptors */
void __user *log_base;
struct vhost_log *log;
@ -172,8 +168,39 @@ enum {
(1ULL << VHOST_F_LOG_ALL),
};
static inline int vhost_has_feature(struct vhost_virtqueue *vq, int bit)
static inline bool vhost_has_feature(struct vhost_virtqueue *vq, int bit)
{
return vq->acked_features & (1 << bit);
return vq->acked_features & (1ULL << bit);
}
/* Memory accessors */
static inline u16 vhost16_to_cpu(struct vhost_virtqueue *vq, __virtio16 val)
{
return __virtio16_to_cpu(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val);
}
static inline __virtio16 cpu_to_vhost16(struct vhost_virtqueue *vq, u16 val)
{
return __cpu_to_virtio16(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val);
}
static inline u32 vhost32_to_cpu(struct vhost_virtqueue *vq, __virtio32 val)
{
return __virtio32_to_cpu(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val);
}
static inline __virtio32 cpu_to_vhost32(struct vhost_virtqueue *vq, u32 val)
{
return __cpu_to_virtio32(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val);
}
static inline u64 vhost64_to_cpu(struct vhost_virtqueue *vq, __virtio64 val)
{
return __virtio64_to_cpu(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val);
}
static inline __virtio64 cpu_to_vhost64(struct vhost_virtqueue *vq, u64 val)
{
return __cpu_to_virtio64(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val);
}
#endif

1
drivers/virtio/Makefile
View File

@ -1,4 +1,5 @@
obj-$(CONFIG_VIRTIO) += virtio.o virtio_ring.o
obj-$(CONFIG_VIRTIO_MMIO) += virtio_mmio.o
obj-$(CONFIG_VIRTIO_PCI) += virtio_pci.o
virtio_pci-y := virtio_pci_legacy.o virtio_pci_common.o
obj-$(CONFIG_VIRTIO_BALLOON) += virtio_balloon.o

102
drivers/virtio/virtio.c
View File

@ -3,6 +3,7 @@
#include <linux/virtio_config.h>
#include <linux/module.h>
#include <linux/idr.h>
#include <uapi/linux/virtio_ids.h>
/* Unique numbering for virtio devices. */
static DEFINE_IDA(virtio_index_ida);
@ -49,9 +50,9 @@ static ssize_t features_show(struct device *_d,
/* We actually represent this as a bitstring, as it could be
* arbitrary length in future. */
for (i = 0; i < ARRAY_SIZE(dev->features)*BITS_PER_LONG; i++)
for (i = 0; i < sizeof(dev->features)*8; i++)
len += sprintf(buf+len, "%c",
test_bit(i, dev->features) ? '1' : '0');
__virtio_test_bit(dev, i) ? '1' : '0');
len += sprintf(buf+len, "\n");
return len;
}
@ -113,6 +114,13 @@ void virtio_check_driver_offered_feature(const struct virtio_device *vdev,
for (i = 0; i < drv->feature_table_size; i++)
if (drv->feature_table[i] == fbit)
return;
if (drv->feature_table_legacy) {
for (i = 0; i < drv->feature_table_size_legacy; i++)
if (drv->feature_table_legacy[i] == fbit)
return;
}
BUG();
}
EXPORT_SYMBOL_GPL(virtio_check_driver_offered_feature);
@ -159,7 +167,10 @@ static int virtio_dev_probe(struct device *_d)
int err, i;
struct virtio_device *dev = dev_to_virtio(_d);
struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
u32 device_features;
u64 device_features;
u64 driver_features;
u64 driver_features_legacy;
unsigned status;
/* We have a driver! */
add_status(dev, VIRTIO_CONFIG_S_DRIVER);
@ -167,34 +178,66 @@ static int virtio_dev_probe(struct device *_d)
/* Figure out what features the device supports. */
device_features = dev->config->get_features(dev);
/* Features supported by both device and driver into dev->features. */
memset(dev->features, 0, sizeof(dev->features));
/* Figure out what features the driver supports. */
driver_features = 0;
for (i = 0; i < drv->feature_table_size; i++) {
unsigned int f = drv->feature_table[i];
BUG_ON(f >= 32);
if (device_features & (1 << f))
set_bit(f, dev->features);
BUG_ON(f >= 64);
driver_features |= (1ULL << f);
}
/* Some drivers have a separate feature table for virtio v1.0 */
if (drv->feature_table_legacy) {
driver_features_legacy = 0;
for (i = 0; i < drv->feature_table_size_legacy; i++) {
unsigned int f = drv->feature_table_legacy[i];
BUG_ON(f >= 64);
driver_features_legacy |= (1ULL << f);
}
} else {
driver_features_legacy = driver_features;
}
if (device_features & (1ULL << VIRTIO_F_VERSION_1))
dev->features = driver_features & device_features;
else
dev->features = driver_features_legacy & device_features;
/* Transport features always preserved to pass to finalize_features. */
for (i = VIRTIO_TRANSPORT_F_START; i < VIRTIO_TRANSPORT_F_END; i++)
if (device_features & (1 << i))
set_bit(i, dev->features);
if (device_features & (1ULL << i))
__virtio_set_bit(dev, i);
dev->config->finalize_features(dev);
err = dev->config->finalize_features(dev);
if (err)
goto err;
if (virtio_has_feature(dev, VIRTIO_F_VERSION_1)) {
add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK);
status = dev->config->get_status(dev);
if (!(status & VIRTIO_CONFIG_S_FEATURES_OK)) {
dev_err(_d, "virtio: device refuses features: %x\n",
status);
err = -ENODEV;
goto err;
}
}
err = drv->probe(dev);
if (err)
add_status(dev, VIRTIO_CONFIG_S_FAILED);
else {
add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
if (drv->scan)
drv->scan(dev);
goto err;
virtio_config_enable(dev);
}
add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
if (drv->scan)
drv->scan(dev);
virtio_config_enable(dev);
return 0;
err:
add_status(dev, VIRTIO_CONFIG_S_FAILED);
return err;
}
static int virtio_dev_remove(struct device *_d)
@ -223,6 +266,12 @@ static struct bus_type virtio_bus = {
.remove = virtio_dev_remove,
};
bool virtio_device_is_legacy_only(struct virtio_device_id id)
{
return id.device == VIRTIO_ID_BALLOON;
}
EXPORT_SYMBOL_GPL(virtio_device_is_legacy_only);
int register_virtio_driver(struct virtio_driver *driver)
{
/* Catch this early. */
@ -303,6 +352,7 @@ EXPORT_SYMBOL_GPL(virtio_device_freeze);
int virtio_device_restore(struct virtio_device *dev)
{
struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
int ret;
/* We always start by resetting the device, in case a previous
* driver messed it up. */
@ -322,14 +372,14 @@ int virtio_device_restore(struct virtio_device *dev)
/* We have a driver! */
add_status(dev, VIRTIO_CONFIG_S_DRIVER);
dev->config->finalize_features(dev);
ret = dev->config->finalize_features(dev);
if (ret)
goto err;
if (drv->restore) {
int ret = drv->restore(dev);
if (ret) {
add_status(dev, VIRTIO_CONFIG_S_FAILED);
return ret;
}
ret = drv->restore(dev);
if (ret)
goto err;
}
/* Finally, tell the device we're all set */
@ -338,6 +388,10 @@ int virtio_device_restore(struct virtio_device *dev)
virtio_config_enable(dev);
return 0;
err:
add_status(dev, VIRTIO_CONFIG_S_FAILED);
return ret;
}
EXPORT_SYMBOL_GPL(virtio_device_restore);
#endif

17
drivers/virtio/virtio_mmio.c
View File

@ -142,7 +142,7 @@ struct virtio_mmio_vq_info {
/* Configuration interface */
static u32 vm_get_features(struct virtio_device *vdev)
static u64 vm_get_features(struct virtio_device *vdev)
{
struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
@ -152,19 +152,20 @@ static u32 vm_get_features(struct virtio_device *vdev)
return readl(vm_dev->base + VIRTIO_MMIO_HOST_FEATURES);
}
static void vm_finalize_features(struct virtio_device *vdev)
static int vm_finalize_features(struct virtio_device *vdev)
{
struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
int i;
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
for (i = 0; i < ARRAY_SIZE(vdev->features); i++) {
writel(i, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL);
writel(vdev->features[i],
vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES);
}
/* Make sure we don't have any features > 32 bits! */
BUG_ON((u32)vdev->features != vdev->features);
writel(0, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL);
writel(vdev->features, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES);
return 0;
}
static void vm_get(struct virtio_device *vdev, unsigned offset,

802
drivers/virtio/virtio_pci.c
View File

@ -1,802 +0,0 @@
/*
* Virtio PCI driver
*
* This module allows virtio devices to be used over a virtual PCI device.
* This can be used with QEMU based VMMs like KVM or Xen.
*
* Copyright IBM Corp. 2007
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include <linux/module.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/virtio_ring.h>
#include <linux/virtio_pci.h>
#include <linux/highmem.h>
#include <linux/spinlock.h>
MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>");
MODULE_DESCRIPTION("virtio-pci");
MODULE_LICENSE("GPL");
MODULE_VERSION("1");
/* Our device structure */
struct virtio_pci_device
{
struct virtio_device vdev;
struct pci_dev *pci_dev;
/* the IO mapping for the PCI config space */
void __iomem *ioaddr;
/* a list of queues so we can dispatch IRQs */
spinlock_t lock;
struct list_head virtqueues;
/* MSI-X support */
int msix_enabled;
int intx_enabled;
struct msix_entry *msix_entries;
cpumask_var_t *msix_affinity_masks;
/* Name strings for interrupts. This size should be enough,
* and I'm too lazy to allocate each name separately. */
char (*msix_names)[256];
/* Number of available vectors */
unsigned msix_vectors;
/* Vectors allocated, excluding per-vq vectors if any */
unsigned msix_used_vectors;
/* Whether we have vector per vq */
bool per_vq_vectors;
};
/* Constants for MSI-X */
/* Use first vector for configuration changes, second and the rest for
* virtqueues Thus, we need at least 2 vectors for MSI. */
enum {
VP_MSIX_CONFIG_VECTOR = 0,
VP_MSIX_VQ_VECTOR = 1,
};
struct virtio_pci_vq_info
{
/* the actual virtqueue */
struct virtqueue *vq;
/* the number of entries in the queue */
int num;
/* the virtual address of the ring queue */
void *queue;
/* the list node for the virtqueues list */
struct list_head node;
/* MSI-X vector (or none) */
unsigned msix_vector;
};
/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
static const struct pci_device_id virtio_pci_id_table[] = {
{ PCI_DEVICE(0x1af4, PCI_ANY_ID) },
{ 0 }
};
MODULE_DEVICE_TABLE(pci, virtio_pci_id_table);
/* Convert a generic virtio device to our structure */
static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
{
return container_of(vdev, struct virtio_pci_device, vdev);
}
/* virtio config->get_features() implementation */
static u32 vp_get_features(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
/* When someone needs more than 32 feature bits, we'll need to
* steal a bit to indicate that the rest are somewhere else. */
return ioread32(vp_dev->ioaddr + VIRTIO_PCI_HOST_FEATURES);
}
/* virtio config->finalize_features() implementation */
static void vp_finalize_features(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
/* We only support 32 feature bits. */
BUILD_BUG_ON(ARRAY_SIZE(vdev->features) != 1);
iowrite32(vdev->features[0], vp_dev->ioaddr+VIRTIO_PCI_GUEST_FEATURES);
}
/* virtio config->get() implementation */
static void vp_get(struct virtio_device *vdev, unsigned offset,
void *buf, unsigned len)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
void __iomem *ioaddr = vp_dev->ioaddr +
VIRTIO_PCI_CONFIG(vp_dev) + offset;
u8 *ptr = buf;
int i;
for (i = 0; i < len; i++)
ptr[i] = ioread8(ioaddr + i);
}
/* the config->set() implementation. it's symmetric to the config->get()
* implementation */
static void vp_set(struct virtio_device *vdev, unsigned offset,
const void *buf, unsigned len)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
void __iomem *ioaddr = vp_dev->ioaddr +
VIRTIO_PCI_CONFIG(vp_dev) + offset;
const u8 *ptr = buf;
int i;
for (i = 0; i < len; i++)
iowrite8(ptr[i], ioaddr + i);
}
/* config->{get,set}_status() implementations */
static u8 vp_get_status(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
return ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
}
static void vp_set_status(struct virtio_device *vdev, u8 status)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
/* We should never be setting status to 0. */
BUG_ON(status == 0);
iowrite8(status, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
}
/* wait for pending irq handlers */
static void vp_synchronize_vectors(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
int i;
if (vp_dev->intx_enabled)
synchronize_irq(vp_dev->pci_dev->irq);
for (i = 0; i < vp_dev->msix_vectors; ++i)
synchronize_irq(vp_dev->msix_entries[i].vector);
}
static void vp_reset(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
/* 0 status means a reset. */
iowrite8(0, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
/* Flush out the status write, and flush in device writes,
* including MSi-X interrupts, if any. */
ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
/* Flush pending VQ/configuration callbacks. */
vp_synchronize_vectors(vdev);
}
/* the notify function used when creating a virt queue */
static bool vp_notify(struct virtqueue *vq)
{
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
/* we write the queue's selector into the notification register to
* signal the other end */
iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY);
return true;
}
/* Handle a configuration change: Tell driver if it wants to know. */
static irqreturn_t vp_config_changed(int irq, void *opaque)
{
struct virtio_pci_device *vp_dev = opaque;
virtio_config_changed(&vp_dev->vdev);
return IRQ_HANDLED;
}
/* Notify all virtqueues on an interrupt. */
static irqreturn_t vp_vring_interrupt(int irq, void *opaque)
{
struct virtio_pci_device *vp_dev = opaque;
struct virtio_pci_vq_info *info;
irqreturn_t ret = IRQ_NONE;
unsigned long flags;
spin_lock_irqsave(&vp_dev->lock, flags);
list_for_each_entry(info, &vp_dev->virtqueues, node) {
if (vring_interrupt(irq, info->vq) == IRQ_HANDLED)
ret = IRQ_HANDLED;
}
spin_unlock_irqrestore(&vp_dev->lock, flags);
return ret;
}
/* A small wrapper to also acknowledge the interrupt when it's handled.
* I really need an EIO hook for the vring so I can ack the interrupt once we
* know that we'll be handling the IRQ but before we invoke the callback since
* the callback may notify the host which results in the host attempting to
* raise an interrupt that we would then mask once we acknowledged the
* interrupt. */
static irqreturn_t vp_interrupt(int irq, void *opaque)
{
struct virtio_pci_device *vp_dev = opaque;
u8 isr;
/* reading the ISR has the effect of also clearing it so it's very
* important to save off the value. */
isr = ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);
/* It's definitely not us if the ISR was not high */
if (!isr)
return IRQ_NONE;
/* Configuration change? Tell driver if it wants to know. */
if (isr & VIRTIO_PCI_ISR_CONFIG)
vp_config_changed(irq, opaque);
return vp_vring_interrupt(irq, opaque);
}
static void vp_free_vectors(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
int i;
if (vp_dev->intx_enabled) {
free_irq(vp_dev->pci_dev->irq, vp_dev);
vp_dev->intx_enabled = 0;
}
for (i = 0; i < vp_dev->msix_used_vectors; ++i)
free_irq(vp_dev->msix_entries[i].vector, vp_dev);
for (i = 0; i < vp_dev->msix_vectors; i++)
if (vp_dev->msix_affinity_masks[i])
free_cpumask_var(vp_dev->msix_affinity_masks[i]);
if (vp_dev->msix_enabled) {
/* Disable the vector used for configuration */
iowrite16(VIRTIO_MSI_NO_VECTOR,
vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
/* Flush the write out to device */
ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
pci_disable_msix(vp_dev->pci_dev);
vp_dev->msix_enabled = 0;
}
vp_dev->msix_vectors = 0;
vp_dev->msix_used_vectors = 0;
kfree(vp_dev->msix_names);
vp_dev->msix_names = NULL;
kfree(vp_dev->msix_entries);
vp_dev->msix_entries = NULL;
kfree(vp_dev->msix_affinity_masks);
vp_dev->msix_affinity_masks = NULL;
}
static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
bool per_vq_vectors)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
const char *name = dev_name(&vp_dev->vdev.dev);
unsigned i, v;
int err = -ENOMEM;
vp_dev->msix_vectors = nvectors;
vp_dev->msix_entries = kmalloc(nvectors * sizeof *vp_dev->msix_entries,
GFP_KERNEL);
if (!vp_dev->msix_entries)
goto error;
vp_dev->msix_names = kmalloc(nvectors * sizeof *vp_dev->msix_names,
GFP_KERNEL);
if (!vp_dev->msix_names)
goto error;
vp_dev->msix_affinity_masks
= kzalloc(nvectors * sizeof *vp_dev->msix_affinity_masks,
GFP_KERNEL);
if (!vp_dev->msix_affinity_masks)
goto error;
for (i = 0; i < nvectors; ++i)
if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i],
GFP_KERNEL))
goto error;
for (i = 0; i < nvectors; ++i)
vp_dev->msix_entries[i].entry = i;
err = pci_enable_msix_exact(vp_dev->pci_dev,
vp_dev->msix_entries, nvectors);
if (err)
goto error;
vp_dev->msix_enabled = 1;
/* Set the vector used for configuration */
v = vp_dev->msix_used_vectors;
snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
"%s-config", name);
err = request_irq(vp_dev->msix_entries[v].vector,
vp_config_changed, 0, vp_dev->msix_names[v],
vp_dev);
if (err)
goto error;
++vp_dev->msix_used_vectors;
iowrite16(v, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
/* Verify we had enough resources to assign the vector */
v = ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
if (v == VIRTIO_MSI_NO_VECTOR) {
err = -EBUSY;
goto error;
}
if (!per_vq_vectors) {
/* Shared vector for all VQs */
v = vp_dev->msix_used_vectors;
snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
"%s-virtqueues", name);
err = request_irq(vp_dev->msix_entries[v].vector,
vp_vring_interrupt, 0, vp_dev->msix_names[v],
vp_dev);
if (err)
goto error;
++vp_dev->msix_used_vectors;
}
return 0;
error:
vp_free_vectors(vdev);
return err;
}
static int vp_request_intx(struct virtio_device *vdev)
{
int err;
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
err = request_irq(vp_dev->pci_dev->irq, vp_interrupt,
IRQF_SHARED, dev_name(&vdev->dev), vp_dev);
if (!err)
vp_dev->intx_enabled = 1;
return err;
}
static struct virtqueue *setup_vq(struct virtio_device *vdev, unsigned index,
void (*callback)(struct virtqueue *vq),
const char *name,
u16 msix_vec)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_vq_info *info;
struct virtqueue *vq;
unsigned long flags, size;
u16 num;
int err;
/* Select the queue we're interested in */
iowrite16(index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
/* Check if queue is either not available or already active. */
num = ioread16(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NUM);
if (!num || ioread32(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN))
return ERR_PTR(-ENOENT);
/* allocate and fill out our structure the represents an active
* queue */
info = kmalloc(sizeof(struct virtio_pci_vq_info), GFP_KERNEL);
if (!info)
return ERR_PTR(-ENOMEM);
info->num = num;
info->msix_vector = msix_vec;
size = PAGE_ALIGN(vring_size(num, VIRTIO_PCI_VRING_ALIGN));
info->queue = alloc_pages_exact(size, GFP_KERNEL|__GFP_ZERO);
if (info->queue == NULL) {
err = -ENOMEM;
goto out_info;
}
/* activate the queue */
iowrite32(virt_to_phys(info->queue) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT,
vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
/* create the vring */
vq = vring_new_virtqueue(index, info->num, VIRTIO_PCI_VRING_ALIGN, vdev,
true, info->queue, vp_notify, callback, name);
if (!vq) {
err = -ENOMEM;
goto out_activate_queue;
}
vq->priv = info;
info->vq = vq;
if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
iowrite16(msix_vec, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
msix_vec = ioread16(vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
err = -EBUSY;
goto out_assign;
}
}
if (callback) {
spin_lock_irqsave(&vp_dev->lock, flags);
list_add(&info->node, &vp_dev->virtqueues);
spin_unlock_irqrestore(&vp_dev->lock, flags);
} else {
INIT_LIST_HEAD(&info->node);
}
return vq;
out_assign:
vring_del_virtqueue(vq);
out_activate_queue:
iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
free_pages_exact(info->queue, size);
out_info:
kfree(info);
return ERR_PTR(err);
}
static void vp_del_vq(struct virtqueue *vq)
{
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
struct virtio_pci_vq_info *info = vq->priv;
unsigned long flags, size;
spin_lock_irqsave(&vp_dev->lock, flags);
list_del(&info->node);
spin_unlock_irqrestore(&vp_dev->lock, flags);
iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
if (vp_dev->msix_enabled) {
iowrite16(VIRTIO_MSI_NO_VECTOR,
vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
/* Flush the write out to device */
ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);
}
vring_del_virtqueue(vq);
/* Select and deactivate the queue */
iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
size = PAGE_ALIGN(vring_size(info->num, VIRTIO_PCI_VRING_ALIGN));
free_pages_exact(info->queue, size);
kfree(info);
}
/* the config->del_vqs() implementation */
static void vp_del_vqs(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtqueue *vq, *n;
struct virtio_pci_vq_info *info;
list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
info = vq->priv;
if (vp_dev->per_vq_vectors &&
info->msix_vector != VIRTIO_MSI_NO_VECTOR)
free_irq(vp_dev->msix_entries[info->msix_vector].vector,
vq);
vp_del_vq(vq);
}
vp_dev->per_vq_vectors = false;
vp_free_vectors(vdev);
}
static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char *names[],
bool use_msix,
bool per_vq_vectors)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
u16 msix_vec;
int i, err, nvectors, allocated_vectors;
if (!use_msix) {
/* Old style: one normal interrupt for change and all vqs. */
err = vp_request_intx(vdev);
if (err)
goto error_request;
} else {
if (per_vq_vectors) {
/* Best option: one for change interrupt, one per vq. */
nvectors = 1;
for (i = 0; i < nvqs; ++i)
if (callbacks[i])
++nvectors;
} else {
/* Second best: one for change, shared for all vqs. */
nvectors = 2;
}
err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors);
if (err)
goto error_request;
}
vp_dev->per_vq_vectors = per_vq_vectors;
allocated_vectors = vp_dev->msix_used_vectors;
for (i = 0; i < nvqs; ++i) {
if (!names[i]) {
vqs[i] = NULL;
continue;
} else if (!callbacks[i] || !vp_dev->msix_enabled)
msix_vec = VIRTIO_MSI_NO_VECTOR;
else if (vp_dev->per_vq_vectors)
msix_vec = allocated_vectors++;
else
msix_vec = VP_MSIX_VQ_VECTOR;
vqs[i] = setup_vq(vdev, i, callbacks[i], names[i], msix_vec);
if (IS_ERR(vqs[i])) {
err = PTR_ERR(vqs[i]);
goto error_find;
}
if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR)
continue;
/* allocate per-vq irq if available and necessary */
snprintf(vp_dev->msix_names[msix_vec],
sizeof *vp_dev->msix_names,
"%s-%s",
dev_name(&vp_dev->vdev.dev), names[i]);
err = request_irq(vp_dev->msix_entries[msix_vec].vector,
vring_interrupt, 0,
vp_dev->msix_names[msix_vec],
vqs[i]);
if (err) {
vp_del_vq(vqs[i]);
goto error_find;
}
}
return 0;
error_find:
vp_del_vqs(vdev);
error_request:
return err;
}
/* the config->find_vqs() implementation */
static int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char *names[])
{
int err;
/* Try MSI-X with one vector per queue. */
err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names, true, true);
if (!err)
return 0;
/* Fallback: MSI-X with one vector for config, one shared for queues. */
err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
true, false);
if (!err)
return 0;
/* Finally fall back to regular interrupts. */
return vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
false, false);
}
static const char *vp_bus_name(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
return pci_name(vp_dev->pci_dev);
}
/* Setup the affinity for a virtqueue:
* - force the affinity for per vq vector
* - OR over all affinities for shared MSI
* - ignore the affinity request if we're using INTX
*/
static int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
{
struct virtio_device *vdev = vq->vdev;
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_vq_info *info = vq->priv;
struct cpumask *mask;
unsigned int irq;
if (!vq->callback)
return -EINVAL;
if (vp_dev->msix_enabled) {
mask = vp_dev->msix_affinity_masks[info->msix_vector];
irq = vp_dev->msix_entries[info->msix_vector].vector;
if (cpu == -1)
irq_set_affinity_hint(irq, NULL);
else {
cpumask_set_cpu(cpu, mask);
irq_set_affinity_hint(irq, mask);
}
}
return 0;
}
static const struct virtio_config_ops virtio_pci_config_ops = {
.get = vp_get,
.set = vp_set,
.get_status = vp_get_status,
.set_status = vp_set_status,
.reset = vp_reset,
.find_vqs = vp_find_vqs,
.del_vqs = vp_del_vqs,
.get_features = vp_get_features,
.finalize_features = vp_finalize_features,
.bus_name = vp_bus_name,
.set_vq_affinity = vp_set_vq_affinity,
};
static void virtio_pci_release_dev(struct device *_d)
{
/*
* No need for a release method as we allocate/free
* all devices together with the pci devices.
* Provide an empty one to avoid getting a warning from core.
*/
}
/* the PCI probing function */
static int virtio_pci_probe(struct pci_dev *pci_dev,
const struct pci_device_id *id)
{
struct virtio_pci_device *vp_dev;
int err;
/* We only own devices >= 0x1000 and <= 0x103f: leave the rest. */
if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f)
return -ENODEV;
if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION) {
printk(KERN_ERR "virtio_pci: expected ABI version %d, got %d\n",
VIRTIO_PCI_ABI_VERSION, pci_dev->revision);
return -ENODEV;
}
/* allocate our structure and fill it out */
vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);
if (vp_dev == NULL)
return -ENOMEM;
vp_dev->vdev.dev.parent = &pci_dev->dev;
vp_dev->vdev.dev.release = virtio_pci_release_dev;
vp_dev->vdev.config = &virtio_pci_config_ops;
vp_dev->pci_dev = pci_dev;
INIT_LIST_HEAD(&vp_dev->virtqueues);
spin_lock_init(&vp_dev->lock);
/* Disable MSI/MSIX to bring device to a known good state. */
pci_msi_off(pci_dev);
/* enable the device */
err = pci_enable_device(pci_dev);
if (err)
goto out;
err = pci_request_regions(pci_dev, "virtio-pci");
if (err)
goto out_enable_device;
vp_dev->ioaddr = pci_iomap(pci_dev, 0, 0);
if (vp_dev->ioaddr == NULL) {
err = -ENOMEM;
goto out_req_regions;
}
pci_set_drvdata(pci_dev, vp_dev);
pci_set_master(pci_dev);
/* we use the subsystem vendor/device id as the virtio vendor/device
* id. this allows us to use the same PCI vendor/device id for all
* virtio devices and to identify the particular virtio driver by
* the subsystem ids */
vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;
vp_dev->vdev.id.device = pci_dev->subsystem_device;
/* finally register the virtio device */
err = register_virtio_device(&vp_dev->vdev);
if (err)
goto out_set_drvdata;
return 0;
out_set_drvdata:
pci_iounmap(pci_dev, vp_dev->ioaddr);
out_req_regions:
pci_release_regions(pci_dev);
out_enable_device:
pci_disable_device(pci_dev);
out:
kfree(vp_dev);
return err;
}
static void virtio_pci_remove(struct pci_dev *pci_dev)
{
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
unregister_virtio_device(&vp_dev->vdev);
vp_del_vqs(&vp_dev->vdev);
pci_iounmap(pci_dev, vp_dev->ioaddr);
pci_release_regions(pci_dev);
pci_disable_device(pci_dev);
kfree(vp_dev);
}
#ifdef CONFIG_PM_SLEEP
static int virtio_pci_freeze(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
int ret;
ret = virtio_device_freeze(&vp_dev->vdev);
if (!ret)
pci_disable_device(pci_dev);
return ret;
}
static int virtio_pci_restore(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
int ret;
ret = pci_enable_device(pci_dev);
if (ret)
return ret;
pci_set_master(pci_dev);
return virtio_device_restore(&vp_dev->vdev);
}
static const struct dev_pm_ops virtio_pci_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore)
};
#endif
static struct pci_driver virtio_pci_driver = {
.name = "virtio-pci",
.id_table = virtio_pci_id_table,
.probe = virtio_pci_probe,
.remove = virtio_pci_remove,
#ifdef CONFIG_PM_SLEEP
.driver.pm = &virtio_pci_pm_ops,
#endif
};
module_pci_driver(virtio_pci_driver);

464
drivers/virtio/virtio_pci_common.c Normal file
View File

@ -0,0 +1,464 @@
/*
* Virtio PCI driver - common functionality for all device versions
*
* This module allows virtio devices to be used over a virtual PCI device.
* This can be used with QEMU based VMMs like KVM or Xen.
*
* Copyright IBM Corp. 2007
* Copyright Red Hat, Inc. 2014
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
* Rusty Russell <rusty@rustcorp.com.au>
* Michael S. Tsirkin <mst@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "virtio_pci_common.h"
/* wait for pending irq handlers */
void vp_synchronize_vectors(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
int i;
if (vp_dev->intx_enabled)
synchronize_irq(vp_dev->pci_dev->irq);
for (i = 0; i < vp_dev->msix_vectors; ++i)
synchronize_irq(vp_dev->msix_entries[i].vector);
}
/* the notify function used when creating a virt queue */
bool vp_notify(struct virtqueue *vq)
{
/* we write the queue's selector into the notification register to
* signal the other end */
iowrite16(vq->index, (void __iomem *)vq->priv);
return true;
}
/* Handle a configuration change: Tell driver if it wants to know. */
static irqreturn_t vp_config_changed(int irq, void *opaque)
{
struct virtio_pci_device *vp_dev = opaque;
virtio_config_changed(&vp_dev->vdev);
return IRQ_HANDLED;
}
/* Notify all virtqueues on an interrupt. */
static irqreturn_t vp_vring_interrupt(int irq, void *opaque)
{
struct virtio_pci_device *vp_dev = opaque;
struct virtio_pci_vq_info *info;
irqreturn_t ret = IRQ_NONE;
unsigned long flags;
spin_lock_irqsave(&vp_dev->lock, flags);
list_for_each_entry(info, &vp_dev->virtqueues, node) {
if (vring_interrupt(irq, info->vq) == IRQ_HANDLED)
ret = IRQ_HANDLED;
}
spin_unlock_irqrestore(&vp_dev->lock, flags);
return ret;
}
/* A small wrapper to also acknowledge the interrupt when it's handled.
* I really need an EIO hook for the vring so I can ack the interrupt once we
* know that we'll be handling the IRQ but before we invoke the callback since
* the callback may notify the host which results in the host attempting to
* raise an interrupt that we would then mask once we acknowledged the
* interrupt. */
static irqreturn_t vp_interrupt(int irq, void *opaque)
{
struct virtio_pci_device *vp_dev = opaque;
u8 isr;
/* reading the ISR has the effect of also clearing it so it's very
* important to save off the value. */
isr = ioread8(vp_dev->isr);
/* It's definitely not us if the ISR was not high */
if (!isr)
return IRQ_NONE;
/* Configuration change? Tell driver if it wants to know. */
if (isr & VIRTIO_PCI_ISR_CONFIG)
vp_config_changed(irq, opaque);
return vp_vring_interrupt(irq, opaque);
}
static void vp_free_vectors(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
int i;
if (vp_dev->intx_enabled) {
free_irq(vp_dev->pci_dev->irq, vp_dev);
vp_dev->intx_enabled = 0;
}
for (i = 0; i < vp_dev->msix_used_vectors; ++i)
free_irq(vp_dev->msix_entries[i].vector, vp_dev);
for (i = 0; i < vp_dev->msix_vectors; i++)
if (vp_dev->msix_affinity_masks[i])
free_cpumask_var(vp_dev->msix_affinity_masks[i]);
if (vp_dev->msix_enabled) {
/* Disable the vector used for configuration */
vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR);
pci_disable_msix(vp_dev->pci_dev);
vp_dev->msix_enabled = 0;
}
vp_dev->msix_vectors = 0;
vp_dev->msix_used_vectors = 0;
kfree(vp_dev->msix_names);
vp_dev->msix_names = NULL;
kfree(vp_dev->msix_entries);
vp_dev->msix_entries = NULL;
kfree(vp_dev->msix_affinity_masks);
vp_dev->msix_affinity_masks = NULL;
}
static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
bool per_vq_vectors)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
const char *name = dev_name(&vp_dev->vdev.dev);
unsigned i, v;
int err = -ENOMEM;
vp_dev->msix_vectors = nvectors;
vp_dev->msix_entries = kmalloc(nvectors * sizeof *vp_dev->msix_entries,
GFP_KERNEL);
if (!vp_dev->msix_entries)
goto error;
vp_dev->msix_names = kmalloc(nvectors * sizeof *vp_dev->msix_names,
GFP_KERNEL);
if (!vp_dev->msix_names)
goto error;
vp_dev->msix_affinity_masks
= kzalloc(nvectors * sizeof *vp_dev->msix_affinity_masks,
GFP_KERNEL);
if (!vp_dev->msix_affinity_masks)
goto error;
for (i = 0; i < nvectors; ++i)
if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i],
GFP_KERNEL))
goto error;
for (i = 0; i < nvectors; ++i)
vp_dev->msix_entries[i].entry = i;
err = pci_enable_msix_exact(vp_dev->pci_dev,
vp_dev->msix_entries, nvectors);
if (err)
goto error;
vp_dev->msix_enabled = 1;
/* Set the vector used for configuration */
v = vp_dev->msix_used_vectors;
snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
"%s-config", name);
err = request_irq(vp_dev->msix_entries[v].vector,
vp_config_changed, 0, vp_dev->msix_names[v],
vp_dev);
if (err)
goto error;
++vp_dev->msix_used_vectors;
v = vp_dev->config_vector(vp_dev, v);
/* Verify we had enough resources to assign the vector */
if (v == VIRTIO_MSI_NO_VECTOR) {
err = -EBUSY;
goto error;
}
if (!per_vq_vectors) {
/* Shared vector for all VQs */
v = vp_dev->msix_used_vectors;
snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
"%s-virtqueues", name);
err = request_irq(vp_dev->msix_entries[v].vector,
vp_vring_interrupt, 0, vp_dev->msix_names[v],
vp_dev);
if (err)
goto error;
++vp_dev->msix_used_vectors;
}
return 0;
error:
vp_free_vectors(vdev);
return err;
}
static int vp_request_intx(struct virtio_device *vdev)
{
int err;
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
err = request_irq(vp_dev->pci_dev->irq, vp_interrupt,
IRQF_SHARED, dev_name(&vdev->dev), vp_dev);
if (!err)
vp_dev->intx_enabled = 1;
return err;
}
static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned index,
void (*callback)(struct virtqueue *vq),
const char *name,
u16 msix_vec)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_vq_info *info = kmalloc(sizeof *info, GFP_KERNEL);
struct virtqueue *vq;
unsigned long flags;
/* fill out our structure that represents an active queue */
if (!info)
return ERR_PTR(-ENOMEM);
vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, msix_vec);
if (IS_ERR(vq))
goto out_info;
info->vq = vq;
if (callback) {
spin_lock_irqsave(&vp_dev->lock, flags);
list_add(&info->node, &vp_dev->virtqueues);
spin_unlock_irqrestore(&vp_dev->lock, flags);
} else {
INIT_LIST_HEAD(&info->node);
}
vp_dev->vqs[index] = info;
return vq;
out_info:
kfree(info);
return vq;
}
static void vp_del_vq(struct virtqueue *vq)
{
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
unsigned long flags;
spin_lock_irqsave(&vp_dev->lock, flags);
list_del(&info->node);
spin_unlock_irqrestore(&vp_dev->lock, flags);
vp_dev->del_vq(info);
kfree(info);
}
/* the config->del_vqs() implementation */
void vp_del_vqs(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtqueue *vq, *n;
struct virtio_pci_vq_info *info;
list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
info = vp_dev->vqs[vq->index];
if (vp_dev->per_vq_vectors &&
info->msix_vector != VIRTIO_MSI_NO_VECTOR)
free_irq(vp_dev->msix_entries[info->msix_vector].vector,
vq);
vp_del_vq(vq);
}
vp_dev->per_vq_vectors = false;
vp_free_vectors(vdev);
kfree(vp_dev->vqs);
}
static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char *names[],
bool use_msix,
bool per_vq_vectors)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
u16 msix_vec;
int i, err, nvectors, allocated_vectors;
vp_dev->vqs = kmalloc(nvqs * sizeof *vp_dev->vqs, GFP_KERNEL);
if (!vp_dev->vqs)
return -ENOMEM;
if (!use_msix) {
/* Old style: one normal interrupt for change and all vqs. */
err = vp_request_intx(vdev);
if (err)
goto error_find;
} else {
if (per_vq_vectors) {
/* Best option: one for change interrupt, one per vq. */
nvectors = 1;
for (i = 0; i < nvqs; ++i)
if (callbacks[i])
++nvectors;
} else {
/* Second best: one for change, shared for all vqs. */
nvectors = 2;
}
err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors);
if (err)
goto error_find;
}
vp_dev->per_vq_vectors = per_vq_vectors;
allocated_vectors = vp_dev->msix_used_vectors;
for (i = 0; i < nvqs; ++i) {
if (!names[i]) {
vqs[i] = NULL;
continue;
} else if (!callbacks[i] || !vp_dev->msix_enabled)
msix_vec = VIRTIO_MSI_NO_VECTOR;
else if (vp_dev->per_vq_vectors)
msix_vec = allocated_vectors++;
else
msix_vec = VP_MSIX_VQ_VECTOR;
vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i], msix_vec);
if (IS_ERR(vqs[i])) {
err = PTR_ERR(vqs[i]);
goto error_find;
}
if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR)
continue;
/* allocate per-vq irq if available and necessary */
snprintf(vp_dev->msix_names[msix_vec],
sizeof *vp_dev->msix_names,
"%s-%s",
dev_name(&vp_dev->vdev.dev), names[i]);
err = request_irq(vp_dev->msix_entries[msix_vec].vector,
vring_interrupt, 0,
vp_dev->msix_names[msix_vec],
vqs[i]);
if (err) {
vp_del_vq(vqs[i]);
goto error_find;
}
}
return 0;
error_find:
vp_del_vqs(vdev);
return err;
}
/* the config->find_vqs() implementation */
int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char *names[])
{
int err;
/* Try MSI-X with one vector per queue. */
err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names, true, true);
if (!err)
return 0;
/* Fallback: MSI-X with one vector for config, one shared for queues. */
err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
true, false);
if (!err)
return 0;
/* Finally fall back to regular interrupts. */
return vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
false, false);
}
const char *vp_bus_name(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
return pci_name(vp_dev->pci_dev);
}
/* Setup the affinity for a virtqueue:
* - force the affinity for per vq vector
* - OR over all affinities for shared MSI
* - ignore the affinity request if we're using INTX
*/
int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
{
struct virtio_device *vdev = vq->vdev;
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
struct cpumask *mask;
unsigned int irq;
if (!vq->callback)
return -EINVAL;
if (vp_dev->msix_enabled) {
mask = vp_dev->msix_affinity_masks[info->msix_vector];
irq = vp_dev->msix_entries[info->msix_vector].vector;
if (cpu == -1)
irq_set_affinity_hint(irq, NULL);
else {
cpumask_set_cpu(cpu, mask);
irq_set_affinity_hint(irq, mask);
}
}
return 0;
}
void virtio_pci_release_dev(struct device *_d)
{
/*
* No need for a release method as we allocate/free
* all devices together with the pci devices.
* Provide an empty one to avoid getting a warning from core.
*/
}
#ifdef CONFIG_PM_SLEEP
static int virtio_pci_freeze(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
int ret;
ret = virtio_device_freeze(&vp_dev->vdev);
if (!ret)
pci_disable_device(pci_dev);
return ret;
}
static int virtio_pci_restore(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
int ret;
ret = pci_enable_device(pci_dev);
if (ret)
return ret;
pci_set_master(pci_dev);
return virtio_device_restore(&vp_dev->vdev);
}
const struct dev_pm_ops virtio_pci_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore)
};
#endif

136
drivers/virtio/virtio_pci_common.h Normal file
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@ -0,0 +1,136 @@
#ifndef _DRIVERS_VIRTIO_VIRTIO_PCI_COMMON_H
#define _DRIVERS_VIRTIO_VIRTIO_PCI_COMMON_H
/*
* Virtio PCI driver - APIs for common functionality for all device versions
*
* This module allows virtio devices to be used over a virtual PCI device.
* This can be used with QEMU based VMMs like KVM or Xen.
*
* Copyright IBM Corp. 2007
* Copyright Red Hat, Inc. 2014
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
* Rusty Russell <rusty@rustcorp.com.au>
* Michael S. Tsirkin <mst@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include <linux/module.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/virtio_ring.h>
#define VIRTIO_PCI_NO_LEGACY
#include <linux/virtio_pci.h>
#include <linux/highmem.h>
#include <linux/spinlock.h>
struct virtio_pci_vq_info {
/* the actual virtqueue */
struct virtqueue *vq;
/* the number of entries in the queue */
int num;
/* the virtual address of the ring queue */
void *queue;
/* the list node for the virtqueues list */
struct list_head node;
/* MSI-X vector (or none) */
unsigned msix_vector;
};
/* Our device structure */
struct virtio_pci_device {
struct virtio_device vdev;
struct pci_dev *pci_dev;
/* the IO mapping for the PCI config space */
void __iomem *ioaddr;
/* the IO mapping for ISR operation */
void __iomem *isr;
/* a list of queues so we can dispatch IRQs */
spinlock_t lock;
struct list_head virtqueues;
/* array of all queues for house-keeping */
struct virtio_pci_vq_info **vqs;
/* MSI-X support */
int msix_enabled;
int intx_enabled;
struct msix_entry *msix_entries;
cpumask_var_t *msix_affinity_masks;
/* Name strings for interrupts. This size should be enough,
* and I'm too lazy to allocate each name separately. */
char (*msix_names)[256];
/* Number of available vectors */
unsigned msix_vectors;
/* Vectors allocated, excluding per-vq vectors if any */
unsigned msix_used_vectors;
/* Whether we have vector per vq */
bool per_vq_vectors;
struct virtqueue *(*setup_vq)(struct virtio_pci_device *vp_dev,
struct virtio_pci_vq_info *info,
unsigned idx,
void (*callback)(struct virtqueue *vq),
const char *name,
u16 msix_vec);
void (*del_vq)(struct virtio_pci_vq_info *info);
u16 (*config_vector)(struct virtio_pci_device *vp_dev, u16 vector);
};
/* Constants for MSI-X */
/* Use first vector for configuration changes, second and the rest for
* virtqueues Thus, we need at least 2 vectors for MSI. */
enum {
VP_MSIX_CONFIG_VECTOR = 0,
VP_MSIX_VQ_VECTOR = 1,
};
/* Convert a generic virtio device to our structure */
static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
{
return container_of(vdev, struct virtio_pci_device, vdev);
}
/* wait for pending irq handlers */
void vp_synchronize_vectors(struct virtio_device *vdev);
/* the notify function used when creating a virt queue */
bool vp_notify(struct virtqueue *vq);
/* the config->del_vqs() implementation */
void vp_del_vqs(struct virtio_device *vdev);
/* the config->find_vqs() implementation */
int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char *names[]);
const char *vp_bus_name(struct virtio_device *vdev);
/* Setup the affinity for a virtqueue:
* - force the affinity for per vq vector
* - OR over all affinities for shared MSI
* - ignore the affinity request if we're using INTX
*/
int vp_set_vq_affinity(struct virtqueue *vq, int cpu);
void virtio_pci_release_dev(struct device *);
#ifdef CONFIG_PM_SLEEP
extern const struct dev_pm_ops virtio_pci_pm_ops;
#endif
#endif

326
drivers/virtio/virtio_pci_legacy.c Normal file
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@ -0,0 +1,326 @@
/*
* Virtio PCI driver - legacy device support
*
* This module allows virtio devices to be used over a virtual PCI device.
* This can be used with QEMU based VMMs like KVM or Xen.
*
* Copyright IBM Corp. 2007
* Copyright Red Hat, Inc. 2014
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
* Rusty Russell <rusty@rustcorp.com.au>
* Michael S. Tsirkin <mst@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "virtio_pci_common.h"
/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
static const struct pci_device_id virtio_pci_id_table[] = {
{ PCI_DEVICE(0x1af4, PCI_ANY_ID) },
{ 0 }
};
MODULE_DEVICE_TABLE(pci, virtio_pci_id_table);
/* virtio config->get_features() implementation */
static u64 vp_get_features(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
/* When someone needs more than 32 feature bits, we'll need to
* steal a bit to indicate that the rest are somewhere else. */
return ioread32(vp_dev->ioaddr + VIRTIO_PCI_HOST_FEATURES);
}
/* virtio config->finalize_features() implementation */
static int vp_finalize_features(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
/* Make sure we don't have any features > 32 bits! */
BUG_ON((u32)vdev->features != vdev->features);
/* We only support 32 feature bits. */
iowrite32(vdev->features, vp_dev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);
return 0;
}
/* virtio config->get() implementation */
static void vp_get(struct virtio_device *vdev, unsigned offset,
void *buf, unsigned len)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
void __iomem *ioaddr = vp_dev->ioaddr +
VIRTIO_PCI_CONFIG(vp_dev) + offset;
u8 *ptr = buf;
int i;
for (i = 0; i < len; i++)
ptr[i] = ioread8(ioaddr + i);
}
/* the config->set() implementation. it's symmetric to the config->get()
* implementation */
static void vp_set(struct virtio_device *vdev, unsigned offset,
const void *buf, unsigned len)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
void __iomem *ioaddr = vp_dev->ioaddr +
VIRTIO_PCI_CONFIG(vp_dev) + offset;
const u8 *ptr = buf;
int i;
for (i = 0; i < len; i++)
iowrite8(ptr[i], ioaddr + i);
}
/* config->{get,set}_status() implementations */
static u8 vp_get_status(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
return ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
}
static void vp_set_status(struct virtio_device *vdev, u8 status)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
/* We should never be setting status to 0. */
BUG_ON(status == 0);
iowrite8(status, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
}
static void vp_reset(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
/* 0 status means a reset. */
iowrite8(0, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
/* Flush out the status write, and flush in device writes,
* including MSi-X interrupts, if any. */
ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
/* Flush pending VQ/configuration callbacks. */
vp_synchronize_vectors(vdev);
}
static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
{
/* Setup the vector used for configuration events */
iowrite16(vector, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
/* Verify we had enough resources to assign the vector */
/* Will also flush the write out to device */
return ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
}
static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
struct virtio_pci_vq_info *info,
unsigned index,
void (*callback)(struct virtqueue *vq),
const char *name,
u16 msix_vec)
{
struct virtqueue *vq;
unsigned long size;
u16 num;
int err;
/* Select the queue we're interested in */
iowrite16(index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
/* Check if queue is either not available or already active. */
num = ioread16(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NUM);
if (!num || ioread32(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN))
return ERR_PTR(-ENOENT);
info->num = num;
info->msix_vector = msix_vec;
size = PAGE_ALIGN(vring_size(num, VIRTIO_PCI_VRING_ALIGN));
info->queue = alloc_pages_exact(size, GFP_KERNEL|__GFP_ZERO);
if (info->queue == NULL)
return ERR_PTR(-ENOMEM);
/* activate the queue */
iowrite32(virt_to_phys(info->queue) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT,
vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
/* create the vring */
vq = vring_new_virtqueue(index, info->num,
VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
true, info->queue, vp_notify, callback, name);
if (!vq) {
err = -ENOMEM;
goto out_activate_queue;
}
vq->priv = (void __force *)vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY;
if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
iowrite16(msix_vec, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
msix_vec = ioread16(vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
err = -EBUSY;
goto out_assign;
}
}
return vq;
out_assign:
vring_del_virtqueue(vq);
out_activate_queue:
iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
free_pages_exact(info->queue, size);
return ERR_PTR(err);
}
static void del_vq(struct virtio_pci_vq_info *info)
{
struct virtqueue *vq = info->vq;
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
unsigned long size;
iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
if (vp_dev->msix_enabled) {
iowrite16(VIRTIO_MSI_NO_VECTOR,
vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
/* Flush the write out to device */
ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);
}
vring_del_virtqueue(vq);
/* Select and deactivate the queue */
iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
size = PAGE_ALIGN(vring_size(info->num, VIRTIO_PCI_VRING_ALIGN));
free_pages_exact(info->queue, size);
}
static const struct virtio_config_ops virtio_pci_config_ops = {
.get = vp_get,
.set = vp_set,
.get_status = vp_get_status,
.set_status = vp_set_status,
.reset = vp_reset,
.find_vqs = vp_find_vqs,
.del_vqs = vp_del_vqs,
.get_features = vp_get_features,
.finalize_features = vp_finalize_features,
.bus_name = vp_bus_name,
.set_vq_affinity = vp_set_vq_affinity,
};
/* the PCI probing function */
static int virtio_pci_probe(struct pci_dev *pci_dev,
const struct pci_device_id *id)
{
struct virtio_pci_device *vp_dev;
int err;
/* We only own devices >= 0x1000 and <= 0x103f: leave the rest. */
if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f)
return -ENODEV;
if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION) {
printk(KERN_ERR "virtio_pci: expected ABI version %d, got %d\n",
VIRTIO_PCI_ABI_VERSION, pci_dev->revision);
return -ENODEV;
}
/* allocate our structure and fill it out */
vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);
if (vp_dev == NULL)
return -ENOMEM;
vp_dev->vdev.dev.parent = &pci_dev->dev;
vp_dev->vdev.dev.release = virtio_pci_release_dev;
vp_dev->vdev.config = &virtio_pci_config_ops;
vp_dev->pci_dev = pci_dev;
INIT_LIST_HEAD(&vp_dev->virtqueues);
spin_lock_init(&vp_dev->lock);
/* Disable MSI/MSIX to bring device to a known good state. */
pci_msi_off(pci_dev);
/* enable the device */
err = pci_enable_device(pci_dev);
if (err)
goto out;
err = pci_request_regions(pci_dev, "virtio-pci");
if (err)
goto out_enable_device;
vp_dev->ioaddr = pci_iomap(pci_dev, 0, 0);
if (vp_dev->ioaddr == NULL) {
err = -ENOMEM;
goto out_req_regions;
}
vp_dev->isr = vp_dev->ioaddr + VIRTIO_PCI_ISR;
pci_set_drvdata(pci_dev, vp_dev);
pci_set_master(pci_dev);
/* we use the subsystem vendor/device id as the virtio vendor/device
* id. this allows us to use the same PCI vendor/device id for all
* virtio devices and to identify the particular virtio driver by
* the subsystem ids */
vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;
vp_dev->vdev.id.device = pci_dev->subsystem_device;
vp_dev->config_vector = vp_config_vector;
vp_dev->setup_vq = setup_vq;
vp_dev->del_vq = del_vq;
/* finally register the virtio device */
err = register_virtio_device(&vp_dev->vdev);
if (err)
goto out_set_drvdata;
return 0;
out_set_drvdata:
pci_iounmap(pci_dev, vp_dev->ioaddr);
out_req_regions:
pci_release_regions(pci_dev);
out_enable_device:
pci_disable_device(pci_dev);
out:
kfree(vp_dev);
return err;
}
static void virtio_pci_remove(struct pci_dev *pci_dev)
{
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
unregister_virtio_device(&vp_dev->vdev);
vp_del_vqs(&vp_dev->vdev);
pci_iounmap(pci_dev, vp_dev->ioaddr);
pci_release_regions(pci_dev);
pci_disable_device(pci_dev);
kfree(vp_dev);
}
static struct pci_driver virtio_pci_driver = {
.name = "virtio-pci",
.id_table = virtio_pci_id_table,
.probe = virtio_pci_probe,
.remove = virtio_pci_remove,
#ifdef CONFIG_PM_SLEEP
.driver.pm = &virtio_pci_pm_ops,
#endif
};
module_pci_driver(virtio_pci_driver);

109
drivers/virtio/virtio_ring.c
View File

@ -99,7 +99,8 @@ struct vring_virtqueue
#define to_vvq(_vq) container_of(_vq, struct vring_virtqueue, vq)
static struct vring_desc *alloc_indirect(unsigned int total_sg, gfp_t gfp)
static struct vring_desc *alloc_indirect(struct virtqueue *_vq,
unsigned int total_sg, gfp_t gfp)
{
struct vring_desc *desc;
unsigned int i;
@ -116,7 +117,7 @@ static struct vring_desc *alloc_indirect(unsigned int total_sg, gfp_t gfp)
return NULL;
for (i = 0; i < total_sg; i++)
desc[i].next = i+1;
desc[i].next = cpu_to_virtio16(_vq->vdev, i + 1);
return desc;
}
@ -165,17 +166,17 @@ static inline int virtqueue_add(struct virtqueue *_vq,
/* If the host supports indirect descriptor tables, and we have multiple
* buffers, then go indirect. FIXME: tune this threshold */
if (vq->indirect && total_sg > 1 && vq->vq.num_free)
desc = alloc_indirect(total_sg, gfp);
desc = alloc_indirect(_vq, total_sg, gfp);
else
desc = NULL;
if (desc) {
/* Use a single buffer which doesn't continue */
vq->vring.desc[head].flags = VRING_DESC_F_INDIRECT;
vq->vring.desc[head].addr = virt_to_phys(desc);
vq->vring.desc[head].flags = cpu_to_virtio16(_vq->vdev, VRING_DESC_F_INDIRECT);
vq->vring.desc[head].addr = cpu_to_virtio64(_vq->vdev, virt_to_phys(desc));
/* avoid kmemleak false positive (hidden by virt_to_phys) */
kmemleak_ignore(desc);
vq->vring.desc[head].len = total_sg * sizeof(struct vring_desc);
vq->vring.desc[head].len = cpu_to_virtio32(_vq->vdev, total_sg * sizeof(struct vring_desc));
/* Set up rest to use this indirect table. */
i = 0;
@ -205,28 +206,28 @@ static inline int virtqueue_add(struct virtqueue *_vq,
for (n = 0; n < out_sgs; n++) {
for (sg = sgs[n]; sg; sg = sg_next(sg)) {
desc[i].flags = VRING_DESC_F_NEXT;
desc[i].addr = sg_phys(sg);
desc[i].len = sg->length;
desc[i].flags = cpu_to_virtio16(_vq->vdev, VRING_DESC_F_NEXT);
desc[i].addr = cpu_to_virtio64(_vq->vdev, sg_phys(sg));
desc[i].len = cpu_to_virtio32(_vq->vdev, sg->length);
prev = i;
i = desc[i].next;
i = virtio16_to_cpu(_vq->vdev, desc[i].next);
}
}
for (; n < (out_sgs + in_sgs); n++) {
for (sg = sgs[n]; sg; sg = sg_next(sg)) {
desc[i].flags = VRING_DESC_F_NEXT|VRING_DESC_F_WRITE;
desc[i].addr = sg_phys(sg);
desc[i].len = sg->length;
desc[i].flags = cpu_to_virtio16(_vq->vdev, VRING_DESC_F_NEXT | VRING_DESC_F_WRITE);
desc[i].addr = cpu_to_virtio64(_vq->vdev, sg_phys(sg));
desc[i].len = cpu_to_virtio32(_vq->vdev, sg->length);
prev = i;
i = desc[i].next;
i = virtio16_to_cpu(_vq->vdev, desc[i].next);
}
}
/* Last one doesn't continue. */
desc[prev].flags &= ~VRING_DESC_F_NEXT;
desc[prev].flags &= cpu_to_virtio16(_vq->vdev, ~VRING_DESC_F_NEXT);
/* Update free pointer */
if (indirect)
vq->free_head = vq->vring.desc[head].next;
vq->free_head = virtio16_to_cpu(_vq->vdev, vq->vring.desc[head].next);
else
vq->free_head = i;
@ -235,13 +236,13 @@ static inline int virtqueue_add(struct virtqueue *_vq,
/* Put entry in available array (but don't update avail->idx until they
* do sync). */
avail = (vq->vring.avail->idx & (vq->vring.num-1));
vq->vring.avail->ring[avail] = head;
avail = virtio16_to_cpu(_vq->vdev, vq->vring.avail->idx) & (vq->vring.num - 1);
vq->vring.avail->ring[avail] = cpu_to_virtio16(_vq->vdev, head);
/* Descriptors and available array need to be set before we expose the
* new available array entries. */
virtio_wmb(vq->weak_barriers);
vq->vring.avail->idx++;
vq->vring.avail->idx = cpu_to_virtio16(_vq->vdev, virtio16_to_cpu(_vq->vdev, vq->vring.avail->idx) + 1);
vq->num_added++;
/* This is very unlikely, but theoretically possible. Kick
@ -354,8 +355,8 @@ bool virtqueue_kick_prepare(struct virtqueue *_vq)
* event. */
virtio_mb(vq->weak_barriers);
old = vq->vring.avail->idx - vq->num_added;
new = vq->vring.avail->idx;
old = virtio16_to_cpu(_vq->vdev, vq->vring.avail->idx) - vq->num_added;
new = virtio16_to_cpu(_vq->vdev, vq->vring.avail->idx);
vq->num_added = 0;
#ifdef DEBUG
@ -367,10 +368,10 @@ bool virtqueue_kick_prepare(struct virtqueue *_vq)
#endif
if (vq->event) {
needs_kick = vring_need_event(vring_avail_event(&vq->vring),
needs_kick = vring_need_event(virtio16_to_cpu(_vq->vdev, vring_avail_event(&vq->vring)),
new, old);
} else {
needs_kick = !(vq->vring.used->flags & VRING_USED_F_NO_NOTIFY);
needs_kick = !(vq->vring.used->flags & cpu_to_virtio16(_vq->vdev, VRING_USED_F_NO_NOTIFY));
}
END_USE(vq);
return needs_kick;
@ -432,15 +433,15 @@ static void detach_buf(struct vring_virtqueue *vq, unsigned int head)
i = head;
/* Free the indirect table */
if (vq->vring.desc[i].flags & VRING_DESC_F_INDIRECT)
kfree(phys_to_virt(vq->vring.desc[i].addr));
if (vq->vring.desc[i].flags & cpu_to_virtio16(vq->vq.vdev, VRING_DESC_F_INDIRECT))
kfree(phys_to_virt(virtio64_to_cpu(vq->vq.vdev, vq->vring.desc[i].addr)));
while (vq->vring.desc[i].flags & VRING_DESC_F_NEXT) {
i = vq->vring.desc[i].next;
while (vq->vring.desc[i].flags & cpu_to_virtio16(vq->vq.vdev, VRING_DESC_F_NEXT)) {
i = virtio16_to_cpu(vq->vq.vdev, vq->vring.desc[i].next);
vq->vq.num_free++;
}
vq->vring.desc[i].next = vq->free_head;
vq->vring.desc[i].next = cpu_to_virtio16(vq->vq.vdev, vq->free_head);
vq->free_head = head;
/* Plus final descriptor */
vq->vq.num_free++;
@ -448,7 +449,7 @@ static void detach_buf(struct vring_virtqueue *vq, unsigned int head)
static inline bool more_used(const struct vring_virtqueue *vq)
{
return vq->last_used_idx != vq->vring.used->idx;
return vq->last_used_idx != virtio16_to_cpu(vq->vq.vdev, vq->vring.used->idx);
}
/**
@ -491,8 +492,8 @@ void *virtqueue_get_buf(struct virtqueue *_vq, unsigned int *len)
virtio_rmb(vq->weak_barriers);
last_used = (vq->last_used_idx & (vq->vring.num - 1));
i = vq->vring.used->ring[last_used].id;
*len = vq->vring.used->ring[last_used].len;
i = virtio32_to_cpu(_vq->vdev, vq->vring.used->ring[last_used].id);
*len = virtio32_to_cpu(_vq->vdev, vq->vring.used->ring[last_used].len);
if (unlikely(i >= vq->vring.num)) {
BAD_RING(vq, "id %u out of range\n", i);
@ -510,8 +511,8 @@ void *virtqueue_get_buf(struct virtqueue *_vq, unsigned int *len)
/* If we expect an interrupt for the next entry, tell host
* by writing event index and flush out the write before
* the read in the next get_buf call. */
if (!(vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) {
vring_used_event(&vq->vring) = vq->last_used_idx;
if (!(vq->vring.avail->flags & cpu_to_virtio16(_vq->vdev, VRING_AVAIL_F_NO_INTERRUPT))) {
vring_used_event(&vq->vring) = cpu_to_virtio16(_vq->vdev, vq->last_used_idx);
virtio_mb(vq->weak_barriers);
}
@ -537,7 +538,7 @@ void virtqueue_disable_cb(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
vq->vring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
vq->vring.avail->flags |= cpu_to_virtio16(_vq->vdev, VRING_AVAIL_F_NO_INTERRUPT);
}
EXPORT_SYMBOL_GPL(virtqueue_disable_cb);
@ -565,8 +566,8 @@ unsigned virtqueue_enable_cb_prepare(struct virtqueue *_vq)
/* Depending on the VIRTIO_RING_F_EVENT_IDX feature, we need to
* either clear the flags bit or point the event index at the next
* entry. Always do both to keep code simple. */
vq->vring.avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT;
vring_used_event(&vq->vring) = last_used_idx = vq->last_used_idx;
vq->vring.avail->flags &= cpu_to_virtio16(_vq->vdev, ~VRING_AVAIL_F_NO_INTERRUPT);
vring_used_event(&vq->vring) = cpu_to_virtio16(_vq->vdev, last_used_idx = vq->last_used_idx);
END_USE(vq);
return last_used_idx;
}
@ -586,7 +587,7 @@ bool virtqueue_poll(struct virtqueue *_vq, unsigned last_used_idx)
struct vring_virtqueue *vq = to_vvq(_vq);
virtio_mb(vq->weak_barriers);
return (u16)last_used_idx != vq->vring.used->idx;
return (u16)last_used_idx != virtio16_to_cpu(_vq->vdev, vq->vring.used->idx);
}
EXPORT_SYMBOL_GPL(virtqueue_poll);
@ -633,12 +634,12 @@ bool virtqueue_enable_cb_delayed(struct virtqueue *_vq)
/* Depending on the VIRTIO_RING_F_USED_EVENT_IDX feature, we need to
* either clear the flags bit or point the event index at the next
* entry. Always do both to keep code simple. */
vq->vring.avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT;
vq->vring.avail->flags &= cpu_to_virtio16(_vq->vdev, ~VRING_AVAIL_F_NO_INTERRUPT);
/* TODO: tune this threshold */
bufs = (u16)(vq->vring.avail->idx - vq->last_used_idx) * 3 / 4;
vring_used_event(&vq->vring) = vq->last_used_idx + bufs;
bufs = (u16)(virtio16_to_cpu(_vq->vdev, vq->vring.avail->idx) - vq->last_used_idx) * 3 / 4;
vring_used_event(&vq->vring) = cpu_to_virtio16(_vq->vdev, vq->last_used_idx + bufs);
virtio_mb(vq->weak_barriers);
if (unlikely((u16)(vq->vring.used->idx - vq->last_used_idx) > bufs)) {
if (unlikely((u16)(virtio16_to_cpu(_vq->vdev, vq->vring.used->idx) - vq->last_used_idx) > bufs)) {
END_USE(vq);
return false;
}
@ -670,7 +671,7 @@ void *virtqueue_detach_unused_buf(struct virtqueue *_vq)
/* detach_buf clears data, so grab it now. */
buf = vq->data[i];
detach_buf(vq, i);
vq->vring.avail->idx--;
vq->vring.avail->idx = cpu_to_virtio16(_vq->vdev, virtio16_to_cpu(_vq->vdev, vq->vring.avail->idx) - 1);
END_USE(vq);
return buf;
}
@ -747,12 +748,12 @@ struct virtqueue *vring_new_virtqueue(unsigned int index,
/* No callback? Tell other side not to bother us. */
if (!callback)
vq->vring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
vq->vring.avail->flags |= cpu_to_virtio16(vdev, VRING_AVAIL_F_NO_INTERRUPT);
/* Put everything in free lists. */
vq->free_head = 0;
for (i = 0; i < num-1; i++) {
vq->vring.desc[i].next = i+1;
vq->vring.desc[i].next = cpu_to_virtio16(vdev, i + 1);
vq->data[i] = NULL;
}
vq->data[i] = NULL;
@ -779,9 +780,11 @@ void vring_transport_features(struct virtio_device *vdev)
break;
case VIRTIO_RING_F_EVENT_IDX:
break;
case VIRTIO_F_VERSION_1:
break;
default:
/* We don't understand this bit. */
clear_bit(i, vdev->features);
__virtio_clear_bit(vdev, i);
}
}
}
@ -826,4 +829,20 @@ void virtio_break_device(struct virtio_device *dev)
}
EXPORT_SYMBOL_GPL(virtio_break_device);
void *virtqueue_get_avail(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
return vq->vring.avail;
}
EXPORT_SYMBOL_GPL(virtqueue_get_avail);
void *virtqueue_get_used(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
return vq->vring.used;
}
EXPORT_SYMBOL_GPL(virtqueue_get_used);
MODULE_LICENSE("GPL");

12
include/linux/virtio.h
View File

@ -75,6 +75,9 @@ unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
bool virtqueue_is_broken(struct virtqueue *vq);
void *virtqueue_get_avail(struct virtqueue *vq);
void *virtqueue_get_used(struct virtqueue *vq);
/**
* virtio_device - representation of a device using virtio
* @index: unique position on the virtio bus
@ -101,11 +104,12 @@ struct virtio_device {
const struct virtio_config_ops *config;
const struct vringh_config_ops *vringh_config;
struct list_head vqs;
/* Note that this is a Linux set_bit-style bitmap. */
unsigned long features[1];
u64 features;
void *priv;
};
bool virtio_device_is_legacy_only(struct virtio_device_id id);
static inline struct virtio_device *dev_to_virtio(struct device *_dev)
{
return container_of(_dev, struct virtio_device, dev);
@ -128,6 +132,8 @@ int virtio_device_restore(struct virtio_device *dev);
* @id_table: the ids serviced by this driver.
* @feature_table: an array of feature numbers supported by this driver.
* @feature_table_size: number of entries in the feature table array.
* @feature_table_legacy: same as feature_table but when working in legacy mode.
* @feature_table_size_legacy: number of entries in feature table legacy array.
* @probe: the function to call when a device is found. Returns 0 or -errno.
* @remove: the function to call when a device is removed.
* @config_changed: optional function to call when the device configuration
@ -138,6 +144,8 @@ struct virtio_driver {
const struct virtio_device_id *id_table;
const unsigned int *feature_table;
unsigned int feature_table_size;
const unsigned int *feature_table_legacy;
unsigned int feature_table_size_legacy;
int (*probe)(struct virtio_device *dev);
void (*scan)(struct virtio_device *dev);
void (*remove)(struct virtio_device *dev);

59
include/linux/virtio_byteorder.h Normal file
View File

@ -0,0 +1,59 @@
#ifndef _LINUX_VIRTIO_BYTEORDER_H
#define _LINUX_VIRTIO_BYTEORDER_H
#include <linux/types.h>
#include <uapi/linux/virtio_types.h>
/*
* Low-level memory accessors for handling virtio in modern little endian and in
* compatibility native endian format.
*/
static inline u16 __virtio16_to_cpu(bool little_endian, __virtio16 val)
{
if (little_endian)
return le16_to_cpu((__force __le16)val);
else
return (__force u16)val;
}
static inline __virtio16 __cpu_to_virtio16(bool little_endian, u16 val)
{
if (little_endian)
return (__force __virtio16)cpu_to_le16(val);
else
return (__force __virtio16)val;
}
static inline u32 __virtio32_to_cpu(bool little_endian, __virtio32 val)
{
if (little_endian)
return le32_to_cpu((__force __le32)val);
else
return (__force u32)val;
}
static inline __virtio32 __cpu_to_virtio32(bool little_endian, u32 val)
{
if (little_endian)
return (__force __virtio32)cpu_to_le32(val);
else
return (__force __virtio32)val;
}
static inline u64 __virtio64_to_cpu(bool little_endian, __virtio64 val)
{
if (little_endian)
return le64_to_cpu((__force __le64)val);
else
return (__force u64)val;
}
static inline __virtio64 __cpu_to_virtio64(bool little_endian, u64 val)
{
if (little_endian)
return (__force __virtio64)cpu_to_le64(val);
else
return (__force __virtio64)val;
}
#endif /* _LINUX_VIRTIO_BYTEORDER */

107
include/linux/virtio_config.h
View File

@ -4,6 +4,7 @@
#include <linux/err.h>
#include <linux/bug.h>
#include <linux/virtio.h>
#include <linux/virtio_byteorder.h>
#include <uapi/linux/virtio_config.h>
/**
@ -46,6 +47,7 @@
* vdev: the virtio_device
* This gives the final feature bits for the device: it can change
* the dev->feature bits if it wants.
* Returns 0 on success or error status
* @bus_name: return the bus name associated with the device
* vdev: the virtio_device
* This returns a pointer to the bus name a la pci_name from which
@ -66,8 +68,8 @@ struct virtio_config_ops {
vq_callback_t *callbacks[],
const char *names[]);
void (*del_vqs)(struct virtio_device *);
u32 (*get_features)(struct virtio_device *vdev);
void (*finalize_features)(struct virtio_device *vdev);
u64 (*get_features)(struct virtio_device *vdev);
int (*finalize_features)(struct virtio_device *vdev);
const char *(*bus_name)(struct virtio_device *vdev);
int (*set_vq_affinity)(struct virtqueue *vq, int cpu);
};
@ -76,6 +78,59 @@ struct virtio_config_ops {
void virtio_check_driver_offered_feature(const struct virtio_device *vdev,
unsigned int fbit);
/**
* __virtio_test_bit - helper to test feature bits. For use by transports.
* Devices should normally use virtio_has_feature,
* which includes more checks.
* @vdev: the device
* @fbit: the feature bit
*/
static inline bool __virtio_test_bit(const struct virtio_device *vdev,
unsigned int fbit)
{
/* Did you forget to fix assumptions on max features? */
if (__builtin_constant_p(fbit))
BUILD_BUG_ON(fbit >= 64);
else
BUG_ON(fbit >= 64);
return vdev->features & BIT_ULL(fbit);
}
/**
* __virtio_set_bit - helper to set feature bits. For use by transports.
* @vdev: the device
* @fbit: the feature bit
*/
static inline void __virtio_set_bit(struct virtio_device *vdev,
unsigned int fbit)
{
/* Did you forget to fix assumptions on max features? */
if (__builtin_constant_p(fbit))
BUILD_BUG_ON(fbit >= 64);
else
BUG_ON(fbit >= 64);
vdev->features |= BIT_ULL(fbit);
}
/**
* __virtio_clear_bit - helper to clear feature bits. For use by transports.
* @vdev: the device
* @fbit: the feature bit
*/
static inline void __virtio_clear_bit(struct virtio_device *vdev,
unsigned int fbit)
{
/* Did you forget to fix assumptions on max features? */
if (__builtin_constant_p(fbit))
BUILD_BUG_ON(fbit >= 64);
else
BUG_ON(fbit >= 64);
vdev->features &= ~BIT_ULL(fbit);
}
/**
* virtio_has_feature - helper to determine if this device has this feature.
* @vdev: the device
@ -84,16 +139,10 @@ void virtio_check_driver_offered_feature(const struct virtio_device *vdev,
static inline bool virtio_has_feature(const struct virtio_device *vdev,
unsigned int fbit)
{
/* Did you forget to fix assumptions on max features? */
if (__builtin_constant_p(fbit))
BUILD_BUG_ON(fbit >= 32);
else
BUG_ON(fbit >= 32);
if (fbit < VIRTIO_TRANSPORT_F_START)
virtio_check_driver_offered_feature(vdev, fbit);
return test_bit(fbit, vdev->features);
return __virtio_test_bit(vdev, fbit);
}
static inline
@ -152,6 +201,37 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu)
return 0;
}
/* Memory accessors */
static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val)
{
return __virtio16_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
}
static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val)
{
return __cpu_to_virtio16(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
}
static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val)
{
return __virtio32_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
}
static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val)
{
return __cpu_to_virtio32(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
}
static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val)
{
return __virtio64_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
}
static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
{
return __cpu_to_virtio64(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
}
/* Config space accessors. */
#define virtio_cread(vdev, structname, member, ptr) \
do { \
@ -239,12 +319,13 @@ static inline u16 virtio_cread16(struct virtio_device *vdev,
{
u16 ret;
vdev->config->get(vdev, offset, &ret, sizeof(ret));
return ret;
return virtio16_to_cpu(vdev, (__force __virtio16)ret);
}
static inline void virtio_cwrite16(struct virtio_device *vdev,
unsigned int offset, u16 val)
{
val = (__force u16)cpu_to_virtio16(vdev, val);
vdev->config->set(vdev, offset, &val, sizeof(val));
}
@ -253,12 +334,13 @@ static inline u32 virtio_cread32(struct virtio_device *vdev,
{
u32 ret;
vdev->config->get(vdev, offset, &ret, sizeof(ret));
return ret;
return virtio32_to_cpu(vdev, (__force __virtio32)ret);
}
static inline void virtio_cwrite32(struct virtio_device *vdev,
unsigned int offset, u32 val)
{
val = (__force u32)cpu_to_virtio32(vdev, val);
vdev->config->set(vdev, offset, &val, sizeof(val));
}
@ -267,12 +349,13 @@ static inline u64 virtio_cread64(struct virtio_device *vdev,
{
u64 ret;
vdev->config->get(vdev, offset, &ret, sizeof(ret));
return ret;
return virtio64_to_cpu(vdev, (__force __virtio64)ret);
}
static inline void virtio_cwrite64(struct virtio_device *vdev,
unsigned int offset, u64 val)
{
val = (__force u64)cpu_to_virtio64(vdev, val);
vdev->config->set(vdev, offset, &val, sizeof(val));
}

2
include/uapi/linux/Kbuild
View File

@ -424,10 +424,12 @@ header-y += virtio_blk.h
header-y += virtio_config.h
header-y += virtio_console.h
header-y += virtio_ids.h
header-y += virtio_types.h
header-y += virtio_net.h
header-y += virtio_pci.h
header-y += virtio_ring.h
header-y += virtio_rng.h
header-y += virtio_scsi.h
header-y += vm_sockets.h
header-y += vt.h
header-y += wait.h

17
include/uapi/linux/if_tun.h
View File

@ -22,21 +22,11 @@
/* Read queue size */
#define TUN_READQ_SIZE 500
/* TUN device flags */
#define TUN_TUN_DEV 0x0001
#define TUN_TAP_DEV 0x0002
/* TUN device type flags: deprecated. Use IFF_TUN/IFF_TAP instead. */
#define TUN_TUN_DEV IFF_TUN
#define TUN_TAP_DEV IFF_TAP
#define TUN_TYPE_MASK 0x000f
#define TUN_FASYNC 0x0010
#define TUN_NOCHECKSUM 0x0020
#define TUN_NO_PI 0x0040
/* This flag has no real effect */
#define TUN_ONE_QUEUE 0x0080
#define TUN_PERSIST 0x0100
#define TUN_VNET_HDR 0x0200
#define TUN_TAP_MQ 0x0400
/* Ioctl defines */
#define TUNSETNOCSUM _IOW('T', 200, int)
#define TUNSETDEBUG _IOW('T', 201, int)
@ -67,6 +57,7 @@
#define IFF_ONE_QUEUE 0x2000
#define IFF_VNET_HDR 0x4000
#define IFF_TUN_EXCL 0x8000
#define IFF_VNET_LE 0x10000
#define IFF_MULTI_QUEUE 0x0100
#define IFF_ATTACH_QUEUE 0x0200
#define IFF_DETACH_QUEUE 0x0400

15
include/uapi/linux/virtio_blk.h
View File

@ -28,6 +28,7 @@
#include <linux/types.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>
#include <linux/virtio_types.h>
/* Feature bits */
#define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */
@ -114,18 +115,18 @@ struct virtio_blk_config {
/* This is the first element of the read scatter-gather list. */
struct virtio_blk_outhdr {
/* VIRTIO_BLK_T* */
__u32 type;
__virtio32 type;
/* io priority. */
__u32 ioprio;
__virtio32 ioprio;
/* Sector (ie. 512 byte offset) */
__u64 sector;
__virtio64 sector;
};
struct virtio_scsi_inhdr {
__u32 errors;
__u32 data_len;
__u32 sense_len;
__u32 residual;
__virtio32 errors;
__virtio32 data_len;
__virtio32 sense_len;
__virtio32 residual;
};
/* And this is the final byte of the write scatter-gather list. */

9
include/uapi/linux/virtio_config.h
View File

@ -38,14 +38,16 @@
#define VIRTIO_CONFIG_S_DRIVER 2
/* Driver has used its parts of the config, and is happy */
#define VIRTIO_CONFIG_S_DRIVER_OK 4
/* Driver has finished configuring features */
#define VIRTIO_CONFIG_S_FEATURES_OK 8
/* We've given up on this device. */
#define VIRTIO_CONFIG_S_FAILED 0x80
/* Some virtio feature bits (currently bits 28 through 31) are reserved for the
/* Some virtio feature bits (currently bits 28 through 32) are reserved for the
* transport being used (eg. virtio_ring), the rest are per-device feature
* bits. */
#define VIRTIO_TRANSPORT_F_START 28
#define VIRTIO_TRANSPORT_F_END 32
#define VIRTIO_TRANSPORT_F_END 33
/* Do we get callbacks when the ring is completely used, even if we've
* suppressed them? */
@ -54,4 +56,7 @@
/* Can the device handle any descriptor layout? */
#define VIRTIO_F_ANY_LAYOUT 27
/* v1.0 compliant. */
#define VIRTIO_F_VERSION_1 32
#endif /* _UAPI_LINUX_VIRTIO_CONFIG_H */

7
include/uapi/linux/virtio_console.h
View File

@ -32,6 +32,7 @@
#ifndef _UAPI_LINUX_VIRTIO_CONSOLE_H
#define _UAPI_LINUX_VIRTIO_CONSOLE_H
#include <linux/types.h>
#include <linux/virtio_types.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>
@ -58,9 +59,9 @@ struct virtio_console_config {
* particular port.
*/
struct virtio_console_control {
__u32 id; /* Port number */
__u16 event; /* The kind of control event (see below) */
__u16 value; /* Extra information for the key */
__virtio32 id; /* Port number */
__virtio16 event; /* The kind of control event (see below) */
__virtio16 value; /* Extra information for the key */
};
/* Some events for control messages */

15
include/uapi/linux/virtio_net.h
View File

@ -28,6 +28,7 @@
#include <linux/types.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>
#include <linux/virtio_types.h>
#include <linux/if_ether.h>
/* The feature bitmap for virtio net */
@ -84,17 +85,17 @@ struct virtio_net_hdr {
#define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP
#define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set
__u8 gso_type;
__u16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
__u16 gso_size; /* Bytes to append to hdr_len per frame */
__u16 csum_start; /* Position to start checksumming from */
__u16 csum_offset; /* Offset after that to place checksum */
__virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
__virtio16 gso_size; /* Bytes to append to hdr_len per frame */
__virtio16 csum_start; /* Position to start checksumming from */
__virtio16 csum_offset; /* Offset after that to place checksum */
};
/* This is the version of the header to use when the MRG_RXBUF
* feature has been negotiated. */
struct virtio_net_hdr_mrg_rxbuf {
struct virtio_net_hdr hdr;
__u16 num_buffers; /* Number of merged rx buffers */
__virtio16 num_buffers; /* Number of merged rx buffers */
};
/*
@ -149,7 +150,7 @@ typedef __u8 virtio_net_ctrl_ack;
* VIRTIO_NET_F_CTRL_MAC_ADDR feature is available.
*/
struct virtio_net_ctrl_mac {
__u32 entries;
__virtio32 entries;
__u8 macs[][ETH_ALEN];
} __attribute__((packed));
@ -193,7 +194,7 @@ struct virtio_net_ctrl_mac {
* specified.
*/
struct virtio_net_ctrl_mq {
__u16 virtqueue_pairs;
__virtio16 virtqueue_pairs;
};
#define VIRTIO_NET_CTRL_MQ 4

45
include/uapi/linux/virtio_ring.h
View File

@ -32,6 +32,7 @@
*
* Copyright Rusty Russell IBM Corporation 2007. */
#include <linux/types.h>
#include <linux/virtio_types.h>
/* This marks a buffer as continuing via the next field. */
#define VRING_DESC_F_NEXT 1
@ -61,32 +62,32 @@
/* Virtio ring descriptors: 16 bytes. These can chain together via "next". */
struct vring_desc {
/* Address (guest-physical). */
__u64 addr;
__virtio64 addr;
/* Length. */
__u32 len;
__virtio32 len;
/* The flags as indicated above. */
__u16 flags;
__virtio16 flags;
/* We chain unused descriptors via this, too */
__u16 next;
__virtio16 next;
};
struct vring_avail {
__u16 flags;
__u16 idx;
__u16 ring[];
__virtio16 flags;
__virtio16 idx;
__virtio16 ring[];
};
/* u32 is used here for ids for padding reasons. */
struct vring_used_elem {
/* Index of start of used descriptor chain. */
__u32 id;
__virtio32 id;
/* Total length of the descriptor chain which was used (written to) */
__u32 len;
__virtio32 len;
};
struct vring_used {
__u16 flags;
__u16 idx;
__virtio16 flags;
__virtio16 idx;
struct vring_used_elem ring[];
};
@ -109,25 +110,25 @@ struct vring {
* struct vring_desc desc[num];
*
* // A ring of available descriptor heads with free-running index.
* __u16 avail_flags;
* __u16 avail_idx;
* __u16 available[num];
* __u16 used_event_idx;
* __virtio16 avail_flags;
* __virtio16 avail_idx;
* __virtio16 available[num];
* __virtio16 used_event_idx;
*
* // Padding to the next align boundary.
* char pad[];
*
* // A ring of used descriptor heads with free-running index.
* __u16 used_flags;
* __u16 used_idx;
* __virtio16 used_flags;
* __virtio16 used_idx;
* struct vring_used_elem used[num];
* __u16 avail_event_idx;
* __virtio16 avail_event_idx;
* };
*/
/* We publish the used event index at the end of the available ring, and vice
* versa. They are at the end for backwards compatibility. */
#define vring_used_event(vr) ((vr)->avail->ring[(vr)->num])
#define vring_avail_event(vr) (*(__u16 *)&(vr)->used->ring[(vr)->num])
#define vring_avail_event(vr) (*(__virtio16 *)&(vr)->used->ring[(vr)->num])
static inline void vring_init(struct vring *vr, unsigned int num, void *p,
unsigned long align)
@ -135,15 +136,15 @@ static inline void vring_init(struct vring *vr, unsigned int num, void *p,
vr->num = num;
vr->desc = p;
vr->avail = p + num*sizeof(struct vring_desc);
vr->used = (void *)(((unsigned long)&vr->avail->ring[num] + sizeof(__u16)
vr->used = (void *)(((unsigned long)&vr->avail->ring[num] + sizeof(__virtio16)
+ align-1) & ~(align - 1));
}
static inline unsigned vring_size(unsigned int num, unsigned long align)
{
return ((sizeof(struct vring_desc) * num + sizeof(__u16) * (3 + num)
return ((sizeof(struct vring_desc) * num + sizeof(__virtio16) * (3 + num)
+ align - 1) & ~(align - 1))
+ sizeof(__u16) * 3 + sizeof(struct vring_used_elem) * num;
+ sizeof(__virtio16) * 3 + sizeof(struct vring_used_elem) * num;
}
/* The following is used with USED_EVENT_IDX and AVAIL_EVENT_IDX */

106
include/linux/virtio_scsi.h → include/uapi/linux/virtio_scsi.h
View File

@ -27,83 +27,85 @@
#ifndef _LINUX_VIRTIO_SCSI_H
#define _LINUX_VIRTIO_SCSI_H
#include <linux/virtio_types.h>
#define VIRTIO_SCSI_CDB_SIZE 32
#define VIRTIO_SCSI_SENSE_SIZE 96
/* SCSI command request, followed by data-out */
struct virtio_scsi_cmd_req {
u8 lun[8]; /* Logical Unit Number */
u64 tag; /* Command identifier */
u8 task_attr; /* Task attribute */
u8 prio; /* SAM command priority field */
u8 crn;
u8 cdb[VIRTIO_SCSI_CDB_SIZE];
} __packed;
__u8 lun[8]; /* Logical Unit Number */
__virtio64 tag; /* Command identifier */
__u8 task_attr; /* Task attribute */
__u8 prio; /* SAM command priority field */
__u8 crn;
__u8 cdb[VIRTIO_SCSI_CDB_SIZE];
} __attribute__((packed));
/* SCSI command request, followed by protection information */
struct virtio_scsi_cmd_req_pi {
u8 lun[8]; /* Logical Unit Number */
u64 tag; /* Command identifier */
u8 task_attr; /* Task attribute */
u8 prio; /* SAM command priority field */
u8 crn;
u32 pi_bytesout; /* DataOUT PI Number of bytes */
u32 pi_bytesin; /* DataIN PI Number of bytes */
u8 cdb[VIRTIO_SCSI_CDB_SIZE];
} __packed;
__u8 lun[8]; /* Logical Unit Number */
__virtio64 tag; /* Command identifier */
__u8 task_attr; /* Task attribute */
__u8 prio; /* SAM command priority field */
__u8 crn;
__virtio32 pi_bytesout; /* DataOUT PI Number of bytes */
__virtio32 pi_bytesin; /* DataIN PI Number of bytes */
__u8 cdb[VIRTIO_SCSI_CDB_SIZE];
} __attribute__((packed));
/* Response, followed by sense data and data-in */
struct virtio_scsi_cmd_resp {
u32 sense_len; /* Sense data length */
u32 resid; /* Residual bytes in data buffer */
u16 status_qualifier; /* Status qualifier */
u8 status; /* Command completion status */
u8 response; /* Response values */
u8 sense[VIRTIO_SCSI_SENSE_SIZE];
} __packed;
__virtio32 sense_len; /* Sense data length */
__virtio32 resid; /* Residual bytes in data buffer */
__virtio16 status_qualifier; /* Status qualifier */
__u8 status; /* Command completion status */
__u8 response; /* Response values */
__u8 sense[VIRTIO_SCSI_SENSE_SIZE];
} __attribute__((packed));
/* Task Management Request */
struct virtio_scsi_ctrl_tmf_req {
u32 type;
u32 subtype;
u8 lun[8];
u64 tag;
} __packed;
__virtio32 type;
__virtio32 subtype;
__u8 lun[8];
__virtio64 tag;
} __attribute__((packed));
struct virtio_scsi_ctrl_tmf_resp {
u8 response;
} __packed;
__u8 response;
} __attribute__((packed));
/* Asynchronous notification query/subscription */
struct virtio_scsi_ctrl_an_req {
u32 type;
u8 lun[8];
u32 event_requested;
} __packed;
__virtio32 type;
__u8 lun[8];
__virtio32 event_requested;
} __attribute__((packed));
struct virtio_scsi_ctrl_an_resp {
u32 event_actual;
u8 response;
} __packed;
__virtio32 event_actual;
__u8 response;
} __attribute__((packed));
struct virtio_scsi_event {
u32 event;
u8 lun[8];
u32 reason;
} __packed;
__virtio32 event;
__u8 lun[8];
__virtio32 reason;
} __attribute__((packed));
struct virtio_scsi_config {
u32 num_queues;
u32 seg_max;
u32 max_sectors;
u32 cmd_per_lun;
u32 event_info_size;
u32 sense_size;
u32 cdb_size;
u16 max_channel;
u16 max_target;
u32 max_lun;
} __packed;
__u32 num_queues;
__u32 seg_max;
__u32 max_sectors;
__u32 cmd_per_lun;
__u32 event_info_size;
__u32 sense_size;
__u32 cdb_size;
__u16 max_channel;
__u16 max_target;
__u32 max_lun;
} __attribute__((packed));
/* Feature Bits */
#define VIRTIO_SCSI_F_INOUT 0

46
include/uapi/linux/virtio_types.h Normal file
View File

@ -0,0 +1,46 @@
#ifndef _UAPI_LINUX_VIRTIO_TYPES_H
#define _UAPI_LINUX_VIRTIO_TYPES_H
/* Type definitions for virtio implementations.
*
* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Copyright (C) 2014 Red Hat, Inc.
* Author: Michael S. Tsirkin <mst@redhat.com>
*/
#include <linux/types.h>
/*
* __virtio{16,32,64} have the following meaning:
* - __u{16,32,64} for virtio devices in legacy mode, accessed in native endian
* - __le{16,32,64} for standard-compliant virtio devices
*/
typedef __u16 __bitwise__ __virtio16;
typedef __u32 __bitwise__ __virtio32;
typedef __u64 __bitwise__ __virtio64;
#endif /* _UAPI_LINUX_VIRTIO_TYPES_H */

35
net/packet/af_packet.c
View File

@ -2444,13 +2444,15 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
goto out_unlock;
if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
(vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
vnet_hdr.hdr_len))
vnet_hdr.hdr_len = vnet_hdr.csum_start +
vnet_hdr.csum_offset + 2;
(__virtio16_to_cpu(false, vnet_hdr.csum_start) +
__virtio16_to_cpu(false, vnet_hdr.csum_offset) + 2 >
__virtio16_to_cpu(false, vnet_hdr.hdr_len)))
vnet_hdr.hdr_len = __cpu_to_virtio16(false,
__virtio16_to_cpu(false, vnet_hdr.csum_start) +
__virtio16_to_cpu(false, vnet_hdr.csum_offset) + 2);
err = -EINVAL;
if (vnet_hdr.hdr_len > len)
if (__virtio16_to_cpu(false, vnet_hdr.hdr_len) > len)
goto out_unlock;
if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
@ -2492,7 +2494,8 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
err = -ENOBUFS;
hlen = LL_RESERVED_SPACE(dev);
tlen = dev->needed_tailroom;
skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, vnet_hdr.hdr_len,
skb = packet_alloc_skb(sk, hlen + tlen, hlen, len,
__virtio16_to_cpu(false, vnet_hdr.hdr_len),
msg->msg_flags & MSG_DONTWAIT, &err);
if (skb == NULL)
goto out_unlock;
@ -2534,14 +2537,16 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
if (po->has_vnet_hdr) {
if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
vnet_hdr.csum_offset)) {
u16 s = __virtio16_to_cpu(false, vnet_hdr.csum_start);
u16 o = __virtio16_to_cpu(false, vnet_hdr.csum_offset);
if (!skb_partial_csum_set(skb, s, o)) {
err = -EINVAL;
goto out_free;
}
}
skb_shinfo(skb)->gso_size = vnet_hdr.gso_size;
skb_shinfo(skb)->gso_size =
__virtio16_to_cpu(false, vnet_hdr.gso_size);
skb_shinfo(skb)->gso_type = gso_type;
/* Header must be checked, and gso_segs computed. */
@ -2912,8 +2917,10 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
struct skb_shared_info *sinfo = skb_shinfo(skb);
/* This is a hint as to how much should be linear. */
vnet_hdr.hdr_len = skb_headlen(skb);
vnet_hdr.gso_size = sinfo->gso_size;
vnet_hdr.hdr_len =
__cpu_to_virtio16(false, skb_headlen(skb));
vnet_hdr.gso_size =
__cpu_to_virtio16(false, sinfo->gso_size);
if (sinfo->gso_type & SKB_GSO_TCPV4)
vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
else if (sinfo->gso_type & SKB_GSO_TCPV6)
@ -2931,8 +2938,10 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
if (skb->ip_summed == CHECKSUM_PARTIAL) {
vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
vnet_hdr.csum_start = skb_checksum_start_offset(skb);
vnet_hdr.csum_offset = skb->csum_offset;
vnet_hdr.csum_start = __cpu_to_virtio16(false,
skb_checksum_start_offset(skb));
vnet_hdr.csum_offset = __cpu_to_virtio16(false,
skb->csum_offset);
} else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID;
} /* else everything is zero */

22
tools/virtio/linux/virtio.h
View File

@ -6,31 +6,11 @@
/* TODO: empty stubs for now. Broken but enough for virtio_ring.c */
#define list_add_tail(a, b) do {} while (0)
#define list_del(a) do {} while (0)
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
#define BITS_PER_BYTE 8
#define BITS_PER_LONG (sizeof(long) * BITS_PER_BYTE)
#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
/* TODO: Not atomic as it should be:
* we don't use this for anything important. */
static inline void clear_bit(int nr, volatile unsigned long *addr)
{
unsigned long mask = BIT_MASK(nr);
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
*p &= ~mask;
}
static inline int test_bit(int nr, const volatile unsigned long *addr)
{
return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
}
/* end of stubs */
struct virtio_device {
void *dev;
unsigned long features[1];
u64 features;
};
struct virtqueue {

2
tools/virtio/linux/virtio_config.h
View File

@ -2,5 +2,5 @@
#define VIRTIO_TRANSPORT_F_END 32
#define virtio_has_feature(dev, feature) \
test_bit((feature), (dev)->features)
(__virtio_test_bit((dev), feature))

5
tools/virtio/virtio_test.c
View File

@ -60,7 +60,7 @@ void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
{
struct vhost_vring_state state = { .index = info->idx };
struct vhost_vring_file file = { .index = info->idx };
unsigned long long features = dev->vdev.features[0];
unsigned long long features = dev->vdev.features;
struct vhost_vring_addr addr = {
.index = info->idx,
.desc_user_addr = (uint64_t)(unsigned long)info->vring.desc,
@ -113,8 +113,7 @@ static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
{
int r;
memset(dev, 0, sizeof *dev);
dev->vdev.features[0] = features;
dev->vdev.features[1] = features >> 32;
dev->vdev.features = features;
dev->buf_size = 1024;
dev->buf = malloc(dev->buf_size);
assert(dev->buf);

16
tools/virtio/vringh_test.c
View File

@ -304,7 +304,7 @@ static int parallel_test(unsigned long features,
close(to_guest[1]);
close(to_host[0]);
gvdev.vdev.features[0] = features;
gvdev.vdev.features = features;
gvdev.to_host_fd = to_host[1];
gvdev.notifies = 0;
@ -449,13 +449,13 @@ int main(int argc, char *argv[])
bool fast_vringh = false, parallel = false;
getrange = getrange_iov;
vdev.features[0] = 0;
vdev.features = 0;
while (argv[1]) {
if (strcmp(argv[1], "--indirect") == 0)
vdev.features[0] |= (1 << VIRTIO_RING_F_INDIRECT_DESC);
__virtio_set_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC);
else if (strcmp(argv[1], "--eventidx") == 0)
vdev.features[0] |= (1 << VIRTIO_RING_F_EVENT_IDX);
__virtio_set_bit(&vdev, VIRTIO_RING_F_EVENT_IDX);
else if (strcmp(argv[1], "--slow-range") == 0)
getrange = getrange_slow;
else if (strcmp(argv[1], "--fast-vringh") == 0)
@ -468,7 +468,7 @@ int main(int argc, char *argv[])
}
if (parallel)
return parallel_test(vdev.features[0], getrange, fast_vringh);
return parallel_test(vdev.features, getrange, fast_vringh);
if (posix_memalign(&__user_addr_min, PAGE_SIZE, USER_MEM) != 0)
abort();
@ -483,7 +483,7 @@ int main(int argc, char *argv[])
/* Set up host side. */
vring_init(&vrh.vring, RINGSIZE, __user_addr_min, ALIGN);
vringh_init_user(&vrh, vdev.features[0], RINGSIZE, true,
vringh_init_user(&vrh, vdev.features, RINGSIZE, true,
vrh.vring.desc, vrh.vring.avail, vrh.vring.used);
/* No descriptor to get yet... */
@ -652,13 +652,13 @@ int main(int argc, char *argv[])
}
/* Test weird (but legal!) indirect. */
if (vdev.features[0] & (1 << VIRTIO_RING_F_INDIRECT_DESC)) {
if (__virtio_test_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC)) {
char *data = __user_addr_max - USER_MEM/4;
struct vring_desc *d = __user_addr_max - USER_MEM/2;
struct vring vring;
/* Force creation of direct, which we modify. */
vdev.features[0] &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC);
__virtio_clear_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC);
vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true,
__user_addr_min,
never_notify_host,