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xen/blkfront: separate per ring information out of device info
Split per ring information to a new structure "blkfront_ring_info".
A ring is the representation of a hardware queue, every vbd device can associate
with one or more rings depending on how many hardware queues/rings to be used.
This patch is a preparation for supporting real multi hardware queues/rings.
We also add a backpointer to 'struct blkfront_info' (dev_info) which
is not needed (we could use containers_of) but further patch
("xen/blkfront: pseudo support for multi hardware queues/rings")
will make allocation of 'blkfront_ring_info' dynamic.
Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com>
Signed-off-by: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Bob Liu
Konrad Rzeszutek Wilk
parent
eb5df87fab
commit
81f3516157
@ -119,6 +119,23 @@ MODULE_PARM_DESC(max_ring_page_order, "Maximum order of pages to be used for the
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*/
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#define RINGREF_NAME_LEN (20)
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/*
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* Per-ring info.
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* Every blkfront device can associate with one or more blkfront_ring_info,
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* depending on how many hardware queues/rings to be used.
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*/
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struct blkfront_ring_info {
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struct blkif_front_ring ring;
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unsigned int ring_ref[XENBUS_MAX_RING_GRANTS];
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unsigned int evtchn, irq;
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struct work_struct work;
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struct gnttab_free_callback callback;
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struct blk_shadow shadow[BLK_MAX_RING_SIZE];
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struct list_head indirect_pages;
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unsigned long shadow_free;
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struct blkfront_info *dev_info;
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};
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/*
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* We have one of these per vbd, whether ide, scsi or 'other'. They
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* hang in private_data off the gendisk structure. We may end up
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@ -133,18 +150,10 @@ struct blkfront_info
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int vdevice;
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blkif_vdev_t handle;
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enum blkif_state connected;
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int ring_ref[XENBUS_MAX_RING_GRANTS];
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unsigned int nr_ring_pages;
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struct blkif_front_ring ring;
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unsigned int evtchn, irq;
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struct request_queue *rq;
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struct work_struct work;
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struct gnttab_free_callback callback;
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struct blk_shadow shadow[BLK_MAX_RING_SIZE];
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struct list_head grants;
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struct list_head indirect_pages;
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unsigned int persistent_gnts_c;
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unsigned long shadow_free;
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unsigned int feature_flush;
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unsigned int feature_discard:1;
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unsigned int feature_secdiscard:1;
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@ -155,6 +164,7 @@ struct blkfront_info
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unsigned int max_indirect_segments;
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int is_ready;
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struct blk_mq_tag_set tag_set;
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struct blkfront_ring_info rinfo;
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};
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static unsigned int nr_minors;
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@ -198,33 +208,35 @@ static DEFINE_SPINLOCK(minor_lock);
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#define GREFS(_psegs) ((_psegs) * GRANTS_PER_PSEG)
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static int blkfront_setup_indirect(struct blkfront_info *info);
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static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo);
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static int blkfront_gather_backend_features(struct blkfront_info *info);
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static int get_id_from_freelist(struct blkfront_info *info)
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static int get_id_from_freelist(struct blkfront_ring_info *rinfo)
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{
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unsigned long free = info->shadow_free;
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BUG_ON(free >= BLK_RING_SIZE(info));
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info->shadow_free = info->shadow[free].req.u.rw.id;
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info->shadow[free].req.u.rw.id = 0x0fffffee; /* debug */
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unsigned long free = rinfo->shadow_free;
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BUG_ON(free >= BLK_RING_SIZE(rinfo->dev_info));
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rinfo->shadow_free = rinfo->shadow[free].req.u.rw.id;
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rinfo->shadow[free].req.u.rw.id = 0x0fffffee; /* debug */
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return free;
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}
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static int add_id_to_freelist(struct blkfront_info *info,
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static int add_id_to_freelist(struct blkfront_ring_info *rinfo,
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unsigned long id)
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{
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if (info->shadow[id].req.u.rw.id != id)
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if (rinfo->shadow[id].req.u.rw.id != id)
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return -EINVAL;
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if (info->shadow[id].request == NULL)
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if (rinfo->shadow[id].request == NULL)
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return -EINVAL;
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info->shadow[id].req.u.rw.id = info->shadow_free;
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info->shadow[id].request = NULL;
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info->shadow_free = id;
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rinfo->shadow[id].req.u.rw.id = rinfo->shadow_free;
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rinfo->shadow[id].request = NULL;
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rinfo->shadow_free = id;
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return 0;
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}
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static int fill_grant_buffer(struct blkfront_info *info, int num)
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static int fill_grant_buffer(struct blkfront_ring_info *rinfo, int num)
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{
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struct blkfront_info *info = rinfo->dev_info;
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struct page *granted_page;
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struct grant *gnt_list_entry, *n;
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int i = 0;
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@ -326,8 +338,8 @@ static struct grant *get_indirect_grant(grant_ref_t *gref_head,
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struct page *indirect_page;
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/* Fetch a pre-allocated page to use for indirect grefs */
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BUG_ON(list_empty(&info->indirect_pages));
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indirect_page = list_first_entry(&info->indirect_pages,
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BUG_ON(list_empty(&info->rinfo.indirect_pages));
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indirect_page = list_first_entry(&info->rinfo.indirect_pages,
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struct page, lru);
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list_del(&indirect_page->lru);
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gnt_list_entry->page = indirect_page;
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@ -403,8 +415,8 @@ static void xlbd_release_minors(unsigned int minor, unsigned int nr)
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static void blkif_restart_queue_callback(void *arg)
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{
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struct blkfront_info *info = (struct blkfront_info *)arg;
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schedule_work(&info->work);
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struct blkfront_ring_info *rinfo = (struct blkfront_ring_info *)arg;
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schedule_work(&rinfo->work);
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}
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static int blkif_getgeo(struct block_device *bd, struct hd_geometry *hg)
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@ -456,16 +468,16 @@ static int blkif_ioctl(struct block_device *bdev, fmode_t mode,
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return 0;
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}
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static int blkif_queue_discard_req(struct request *req)
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static int blkif_queue_discard_req(struct request *req, struct blkfront_ring_info *rinfo)
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{
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struct blkfront_info *info = req->rq_disk->private_data;
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struct blkfront_info *info = rinfo->dev_info;
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struct blkif_request *ring_req;
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unsigned long id;
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/* Fill out a communications ring structure. */
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ring_req = RING_GET_REQUEST(&info->ring, info->ring.req_prod_pvt);
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id = get_id_from_freelist(info);
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info->shadow[id].request = req;
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ring_req = RING_GET_REQUEST(&rinfo->ring, rinfo->ring.req_prod_pvt);
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id = get_id_from_freelist(rinfo);
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rinfo->shadow[id].request = req;
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ring_req->operation = BLKIF_OP_DISCARD;
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ring_req->u.discard.nr_sectors = blk_rq_sectors(req);
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@ -476,10 +488,10 @@ static int blkif_queue_discard_req(struct request *req)
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else
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ring_req->u.discard.flag = 0;
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info->ring.req_prod_pvt++;
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rinfo->ring.req_prod_pvt++;
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/* Keep a private copy so we can reissue requests when recovering. */
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info->shadow[id].req = *ring_req;
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rinfo->shadow[id].req = *ring_req;
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return 0;
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}
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@ -487,7 +499,7 @@ static int blkif_queue_discard_req(struct request *req)
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struct setup_rw_req {
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unsigned int grant_idx;
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struct blkif_request_segment *segments;
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struct blkfront_info *info;
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struct blkfront_ring_info *rinfo;
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struct blkif_request *ring_req;
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grant_ref_t gref_head;
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unsigned int id;
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@ -507,8 +519,9 @@ static void blkif_setup_rw_req_grant(unsigned long gfn, unsigned int offset,
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/* Convenient aliases */
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unsigned int grant_idx = setup->grant_idx;
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struct blkif_request *ring_req = setup->ring_req;
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struct blkfront_info *info = setup->info;
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struct blk_shadow *shadow = &info->shadow[setup->id];
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struct blkfront_ring_info *rinfo = setup->rinfo;
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struct blkfront_info *info = rinfo->dev_info;
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struct blk_shadow *shadow = &rinfo->shadow[setup->id];
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if ((ring_req->operation == BLKIF_OP_INDIRECT) &&
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(grant_idx % GRANTS_PER_INDIRECT_FRAME == 0)) {
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@ -566,16 +579,16 @@ static void blkif_setup_rw_req_grant(unsigned long gfn, unsigned int offset,
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(setup->grant_idx)++;
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}
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static int blkif_queue_rw_req(struct request *req)
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static int blkif_queue_rw_req(struct request *req, struct blkfront_ring_info *rinfo)
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{
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struct blkfront_info *info = req->rq_disk->private_data;
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struct blkfront_info *info = rinfo->dev_info;
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struct blkif_request *ring_req;
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unsigned long id;
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int i;
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struct setup_rw_req setup = {
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.grant_idx = 0,
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.segments = NULL,
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.info = info,
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.rinfo = rinfo,
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.need_copy = rq_data_dir(req) && info->feature_persistent,
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};
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@ -603,9 +616,9 @@ static int blkif_queue_rw_req(struct request *req)
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max_grefs - info->persistent_gnts_c,
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&setup.gref_head) < 0) {
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gnttab_request_free_callback(
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&info->callback,
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&rinfo->callback,
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blkif_restart_queue_callback,
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info,
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rinfo,
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max_grefs);
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return 1;
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}
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@ -613,23 +626,23 @@ static int blkif_queue_rw_req(struct request *req)
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new_persistent_gnts = 0;
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/* Fill out a communications ring structure. */
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ring_req = RING_GET_REQUEST(&info->ring, info->ring.req_prod_pvt);
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id = get_id_from_freelist(info);
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info->shadow[id].request = req;
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ring_req = RING_GET_REQUEST(&rinfo->ring, rinfo->ring.req_prod_pvt);
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id = get_id_from_freelist(rinfo);
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rinfo->shadow[id].request = req;
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BUG_ON(info->max_indirect_segments == 0 &&
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GREFS(req->nr_phys_segments) > BLKIF_MAX_SEGMENTS_PER_REQUEST);
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BUG_ON(info->max_indirect_segments &&
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GREFS(req->nr_phys_segments) > info->max_indirect_segments);
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num_sg = blk_rq_map_sg(req->q, req, info->shadow[id].sg);
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num_sg = blk_rq_map_sg(req->q, req, rinfo->shadow[id].sg);
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num_grant = 0;
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/* Calculate the number of grant used */
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for_each_sg(info->shadow[id].sg, sg, num_sg, i)
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for_each_sg(rinfo->shadow[id].sg, sg, num_sg, i)
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num_grant += gnttab_count_grant(sg->offset, sg->length);
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ring_req->u.rw.id = id;
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info->shadow[id].num_sg = num_sg;
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rinfo->shadow[id].num_sg = num_sg;
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if (num_grant > BLKIF_MAX_SEGMENTS_PER_REQUEST) {
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/*
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* The indirect operation can only be a BLKIF_OP_READ or
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@ -674,7 +687,7 @@ static int blkif_queue_rw_req(struct request *req)
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setup.ring_req = ring_req;
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setup.id = id;
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for_each_sg(info->shadow[id].sg, sg, num_sg, i) {
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for_each_sg(rinfo->shadow[id].sg, sg, num_sg, i) {
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BUG_ON(sg->offset + sg->length > PAGE_SIZE);
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if (setup.need_copy) {
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@ -694,10 +707,10 @@ static int blkif_queue_rw_req(struct request *req)
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if (setup.segments)
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kunmap_atomic(setup.segments);
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info->ring.req_prod_pvt++;
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rinfo->ring.req_prod_pvt++;
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/* Keep a private copy so we can reissue requests when recovering. */
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info->shadow[id].req = *ring_req;
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rinfo->shadow[id].req = *ring_req;
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if (new_persistent_gnts)
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gnttab_free_grant_references(setup.gref_head);
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@ -711,27 +724,25 @@ static int blkif_queue_rw_req(struct request *req)
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*
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* @req: a request struct
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*/
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static int blkif_queue_request(struct request *req)
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static int blkif_queue_request(struct request *req, struct blkfront_ring_info *rinfo)
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{
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struct blkfront_info *info = req->rq_disk->private_data;
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if (unlikely(info->connected != BLKIF_STATE_CONNECTED))
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if (unlikely(rinfo->dev_info->connected != BLKIF_STATE_CONNECTED))
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return 1;
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if (unlikely(req->cmd_flags & (REQ_DISCARD | REQ_SECURE)))
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return blkif_queue_discard_req(req);
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return blkif_queue_discard_req(req, rinfo);
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else
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return blkif_queue_rw_req(req);
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return blkif_queue_rw_req(req, rinfo);
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}
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static inline void flush_requests(struct blkfront_info *info)
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static inline void flush_requests(struct blkfront_ring_info *rinfo)
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{
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int notify;
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RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&info->ring, notify);
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RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&rinfo->ring, notify);
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if (notify)
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notify_remote_via_irq(info->irq);
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notify_remote_via_irq(rinfo->irq);
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}
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static inline bool blkif_request_flush_invalid(struct request *req,
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@ -747,20 +758,21 @@ static inline bool blkif_request_flush_invalid(struct request *req,
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static int blkif_queue_rq(struct blk_mq_hw_ctx *hctx,
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const struct blk_mq_queue_data *qd)
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{
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struct blkfront_info *info = qd->rq->rq_disk->private_data;
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struct blkfront_ring_info *rinfo = (struct blkfront_ring_info *)hctx->driver_data;
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struct blkfront_info *info = rinfo->dev_info;
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blk_mq_start_request(qd->rq);
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spin_lock_irq(&info->io_lock);
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if (RING_FULL(&info->ring))
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if (RING_FULL(&rinfo->ring))
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goto out_busy;
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if (blkif_request_flush_invalid(qd->rq, info))
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if (blkif_request_flush_invalid(qd->rq, rinfo->dev_info))
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goto out_err;
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if (blkif_queue_request(qd->rq))
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if (blkif_queue_request(qd->rq, rinfo))
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goto out_busy;
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flush_requests(info);
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flush_requests(rinfo);
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spin_unlock_irq(&info->io_lock);
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return BLK_MQ_RQ_QUEUE_OK;
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@ -774,9 +786,19 @@ out_busy:
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return BLK_MQ_RQ_QUEUE_BUSY;
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}
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static int blk_mq_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
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unsigned int index)
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{
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struct blkfront_info *info = (struct blkfront_info *)data;
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hctx->driver_data = &info->rinfo;
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return 0;
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}
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static struct blk_mq_ops blkfront_mq_ops = {
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.queue_rq = blkif_queue_rq,
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.map_queue = blk_mq_map_queue,
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.init_hctx = blk_mq_init_hctx,
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};
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static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size,
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@ -1029,6 +1051,7 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
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static void xlvbd_release_gendisk(struct blkfront_info *info)
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{
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unsigned int minor, nr_minors;
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struct blkfront_ring_info *rinfo = &info->rinfo;
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if (info->rq == NULL)
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return;
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@ -1037,10 +1060,10 @@ static void xlvbd_release_gendisk(struct blkfront_info *info)
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blk_mq_stop_hw_queues(info->rq);
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/* No more gnttab callback work. */
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gnttab_cancel_free_callback(&info->callback);
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gnttab_cancel_free_callback(&rinfo->callback);
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/* Flush gnttab callback work. Must be done with no locks held. */
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flush_work(&info->work);
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flush_work(&rinfo->work);
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del_gendisk(info->gd);
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@ -1057,20 +1080,20 @@ static void xlvbd_release_gendisk(struct blkfront_info *info)
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}
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/* Must be called with io_lock holded */
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static void kick_pending_request_queues(struct blkfront_info *info)
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static void kick_pending_request_queues(struct blkfront_ring_info *rinfo)
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{
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if (!RING_FULL(&info->ring))
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blk_mq_start_stopped_hw_queues(info->rq, true);
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if (!RING_FULL(&rinfo->ring))
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blk_mq_start_stopped_hw_queues(rinfo->dev_info->rq, true);
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}
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static void blkif_restart_queue(struct work_struct *work)
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{
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struct blkfront_info *info = container_of(work, struct blkfront_info, work);
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struct blkfront_ring_info *rinfo = container_of(work, struct blkfront_ring_info, work);
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spin_lock_irq(&info->io_lock);
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if (info->connected == BLKIF_STATE_CONNECTED)
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kick_pending_request_queues(info);
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spin_unlock_irq(&info->io_lock);
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spin_lock_irq(&rinfo->dev_info->io_lock);
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if (rinfo->dev_info->connected == BLKIF_STATE_CONNECTED)
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kick_pending_request_queues(rinfo);
|
||||
spin_unlock_irq(&rinfo->dev_info->io_lock);
|
||||
}
|
||||
|
||||
static void blkif_free(struct blkfront_info *info, int suspend)
|
||||
@ -1078,6 +1101,7 @@ static void blkif_free(struct blkfront_info *info, int suspend)
|
||||
struct grant *persistent_gnt;
|
||||
struct grant *n;
|
||||
int i, j, segs;
|
||||
struct blkfront_ring_info *rinfo = &info->rinfo;
|
||||
|
||||
/* Prevent new requests being issued until we fix things up. */
|
||||
spin_lock_irq(&info->io_lock);
|
||||
@ -1090,7 +1114,7 @@ static void blkif_free(struct blkfront_info *info, int suspend)
|
||||
/* Remove all persistent grants */
|
||||
if (!list_empty(&info->grants)) {
|
||||
list_for_each_entry_safe(persistent_gnt, n,
|
||||
&info->grants, node) {
|
||||
&info->grants, node) {
|
||||
list_del(&persistent_gnt->node);
|
||||
if (persistent_gnt->gref != GRANT_INVALID_REF) {
|
||||
gnttab_end_foreign_access(persistent_gnt->gref,
|
||||
@ -1108,11 +1132,11 @@ static void blkif_free(struct blkfront_info *info, int suspend)
|
||||
* Remove indirect pages, this only happens when using indirect
|
||||
* descriptors but not persistent grants
|
||||
*/
|
||||
if (!list_empty(&info->indirect_pages)) {
|
||||
if (!list_empty(&rinfo->indirect_pages)) {
|
||||
struct page *indirect_page, *n;
|
||||
|
||||
BUG_ON(info->feature_persistent);
|
||||
list_for_each_entry_safe(indirect_page, n, &info->indirect_pages, lru) {
|
||||
list_for_each_entry_safe(indirect_page, n, &rinfo->indirect_pages, lru) {
|
||||
list_del(&indirect_page->lru);
|
||||
__free_page(indirect_page);
|
||||
}
|
||||
@ -1123,21 +1147,21 @@ static void blkif_free(struct blkfront_info *info, int suspend)
|
||||
* Clear persistent grants present in requests already
|
||||
* on the shared ring
|
||||
*/
|
||||
if (!info->shadow[i].request)
|
||||
if (!rinfo->shadow[i].request)
|
||||
goto free_shadow;
|
||||
|
||||
segs = info->shadow[i].req.operation == BLKIF_OP_INDIRECT ?
|
||||
info->shadow[i].req.u.indirect.nr_segments :
|
||||
info->shadow[i].req.u.rw.nr_segments;
|
||||
segs = rinfo->shadow[i].req.operation == BLKIF_OP_INDIRECT ?
|
||||
rinfo->shadow[i].req.u.indirect.nr_segments :
|
||||
rinfo->shadow[i].req.u.rw.nr_segments;
|
||||
for (j = 0; j < segs; j++) {
|
||||
persistent_gnt = info->shadow[i].grants_used[j];
|
||||
persistent_gnt = rinfo->shadow[i].grants_used[j];
|
||||
gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL);
|
||||
if (info->feature_persistent)
|
||||
__free_page(persistent_gnt->page);
|
||||
kfree(persistent_gnt);
|
||||
}
|
||||
|
||||
if (info->shadow[i].req.operation != BLKIF_OP_INDIRECT)
|
||||
if (rinfo->shadow[i].req.operation != BLKIF_OP_INDIRECT)
|
||||
/*
|
||||
* If this is not an indirect operation don't try to
|
||||
* free indirect segments
|
||||
@ -1145,41 +1169,41 @@ static void blkif_free(struct blkfront_info *info, int suspend)
|
||||
goto free_shadow;
|
||||
|
||||
for (j = 0; j < INDIRECT_GREFS(segs); j++) {
|
||||
persistent_gnt = info->shadow[i].indirect_grants[j];
|
||||
persistent_gnt = rinfo->shadow[i].indirect_grants[j];
|
||||
gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL);
|
||||
__free_page(persistent_gnt->page);
|
||||
kfree(persistent_gnt);
|
||||
}
|
||||
|
||||
free_shadow:
|
||||
kfree(info->shadow[i].grants_used);
|
||||
info->shadow[i].grants_used = NULL;
|
||||
kfree(info->shadow[i].indirect_grants);
|
||||
info->shadow[i].indirect_grants = NULL;
|
||||
kfree(info->shadow[i].sg);
|
||||
info->shadow[i].sg = NULL;
|
||||
kfree(rinfo->shadow[i].grants_used);
|
||||
rinfo->shadow[i].grants_used = NULL;
|
||||
kfree(rinfo->shadow[i].indirect_grants);
|
||||
rinfo->shadow[i].indirect_grants = NULL;
|
||||
kfree(rinfo->shadow[i].sg);
|
||||
rinfo->shadow[i].sg = NULL;
|
||||
}
|
||||
|
||||
/* No more gnttab callback work. */
|
||||
gnttab_cancel_free_callback(&info->callback);
|
||||
gnttab_cancel_free_callback(&rinfo->callback);
|
||||
spin_unlock_irq(&info->io_lock);
|
||||
|
||||
/* Flush gnttab callback work. Must be done with no locks held. */
|
||||
flush_work(&info->work);
|
||||
flush_work(&rinfo->work);
|
||||
|
||||
/* Free resources associated with old device channel. */
|
||||
for (i = 0; i < info->nr_ring_pages; i++) {
|
||||
if (info->ring_ref[i] != GRANT_INVALID_REF) {
|
||||
gnttab_end_foreign_access(info->ring_ref[i], 0, 0);
|
||||
info->ring_ref[i] = GRANT_INVALID_REF;
|
||||
if (rinfo->ring_ref[i] != GRANT_INVALID_REF) {
|
||||
gnttab_end_foreign_access(rinfo->ring_ref[i], 0, 0);
|
||||
rinfo->ring_ref[i] = GRANT_INVALID_REF;
|
||||
}
|
||||
}
|
||||
free_pages((unsigned long)info->ring.sring, get_order(info->nr_ring_pages * PAGE_SIZE));
|
||||
info->ring.sring = NULL;
|
||||
free_pages((unsigned long)rinfo->ring.sring, get_order(info->nr_ring_pages * PAGE_SIZE));
|
||||
rinfo->ring.sring = NULL;
|
||||
|
||||
if (info->irq)
|
||||
unbind_from_irqhandler(info->irq, info);
|
||||
info->evtchn = info->irq = 0;
|
||||
if (rinfo->irq)
|
||||
unbind_from_irqhandler(rinfo->irq, rinfo);
|
||||
rinfo->evtchn = rinfo->irq = 0;
|
||||
|
||||
}
|
||||
|
||||
@ -1209,12 +1233,13 @@ static void blkif_copy_from_grant(unsigned long gfn, unsigned int offset,
|
||||
kunmap_atomic(shared_data);
|
||||
}
|
||||
|
||||
static void blkif_completion(struct blk_shadow *s, struct blkfront_info *info,
|
||||
static void blkif_completion(struct blk_shadow *s, struct blkfront_ring_info *rinfo,
|
||||
struct blkif_response *bret)
|
||||
{
|
||||
int i = 0;
|
||||
struct scatterlist *sg;
|
||||
int num_sg, num_grant;
|
||||
struct blkfront_info *info = rinfo->dev_info;
|
||||
struct copy_from_grant data = {
|
||||
.s = s,
|
||||
.grant_idx = 0,
|
||||
@ -1284,7 +1309,7 @@ static void blkif_completion(struct blk_shadow *s, struct blkfront_info *info,
|
||||
*/
|
||||
if (!info->feature_persistent) {
|
||||
indirect_page = s->indirect_grants[i]->page;
|
||||
list_add(&indirect_page->lru, &info->indirect_pages);
|
||||
list_add(&indirect_page->lru, &rinfo->indirect_pages);
|
||||
}
|
||||
s->indirect_grants[i]->gref = GRANT_INVALID_REF;
|
||||
list_add_tail(&s->indirect_grants[i]->node, &info->grants);
|
||||
@ -1299,7 +1324,8 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
|
||||
struct blkif_response *bret;
|
||||
RING_IDX i, rp;
|
||||
unsigned long flags;
|
||||
struct blkfront_info *info = (struct blkfront_info *)dev_id;
|
||||
struct blkfront_ring_info *rinfo = (struct blkfront_ring_info *)dev_id;
|
||||
struct blkfront_info *info = rinfo->dev_info;
|
||||
int error;
|
||||
|
||||
spin_lock_irqsave(&info->io_lock, flags);
|
||||
@ -1310,13 +1336,13 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
|
||||
}
|
||||
|
||||
again:
|
||||
rp = info->ring.sring->rsp_prod;
|
||||
rp = rinfo->ring.sring->rsp_prod;
|
||||
rmb(); /* Ensure we see queued responses up to 'rp'. */
|
||||
|
||||
for (i = info->ring.rsp_cons; i != rp; i++) {
|
||||
for (i = rinfo->ring.rsp_cons; i != rp; i++) {
|
||||
unsigned long id;
|
||||
|
||||
bret = RING_GET_RESPONSE(&info->ring, i);
|
||||
bret = RING_GET_RESPONSE(&rinfo->ring, i);
|
||||
id = bret->id;
|
||||
/*
|
||||
* The backend has messed up and given us an id that we would
|
||||
@ -1330,12 +1356,12 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
|
||||
* the id is busted. */
|
||||
continue;
|
||||
}
|
||||
req = info->shadow[id].request;
|
||||
req = rinfo->shadow[id].request;
|
||||
|
||||
if (bret->operation != BLKIF_OP_DISCARD)
|
||||
blkif_completion(&info->shadow[id], info, bret);
|
||||
blkif_completion(&rinfo->shadow[id], rinfo, bret);
|
||||
|
||||
if (add_id_to_freelist(info, id)) {
|
||||
if (add_id_to_freelist(rinfo, id)) {
|
||||
WARN(1, "%s: response to %s (id %ld) couldn't be recycled!\n",
|
||||
info->gd->disk_name, op_name(bret->operation), id);
|
||||
continue;
|
||||
@ -1364,7 +1390,7 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
|
||||
error = -EOPNOTSUPP;
|
||||
}
|
||||
if (unlikely(bret->status == BLKIF_RSP_ERROR &&
|
||||
info->shadow[id].req.u.rw.nr_segments == 0)) {
|
||||
rinfo->shadow[id].req.u.rw.nr_segments == 0)) {
|
||||
printk(KERN_WARNING "blkfront: %s: empty %s op failed\n",
|
||||
info->gd->disk_name, op_name(bret->operation));
|
||||
error = -EOPNOTSUPP;
|
||||
@ -1389,17 +1415,17 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
|
||||
}
|
||||
}
|
||||
|
||||
info->ring.rsp_cons = i;
|
||||
rinfo->ring.rsp_cons = i;
|
||||
|
||||
if (i != info->ring.req_prod_pvt) {
|
||||
if (i != rinfo->ring.req_prod_pvt) {
|
||||
int more_to_do;
|
||||
RING_FINAL_CHECK_FOR_RESPONSES(&info->ring, more_to_do);
|
||||
RING_FINAL_CHECK_FOR_RESPONSES(&rinfo->ring, more_to_do);
|
||||
if (more_to_do)
|
||||
goto again;
|
||||
} else
|
||||
info->ring.sring->rsp_event = i + 1;
|
||||
rinfo->ring.sring->rsp_event = i + 1;
|
||||
|
||||
kick_pending_request_queues(info);
|
||||
kick_pending_request_queues(rinfo);
|
||||
|
||||
spin_unlock_irqrestore(&info->io_lock, flags);
|
||||
|
||||
@ -1408,15 +1434,16 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
|
||||
|
||||
|
||||
static int setup_blkring(struct xenbus_device *dev,
|
||||
struct blkfront_info *info)
|
||||
struct blkfront_ring_info *rinfo)
|
||||
{
|
||||
struct blkif_sring *sring;
|
||||
int err, i;
|
||||
struct blkfront_info *info = rinfo->dev_info;
|
||||
unsigned long ring_size = info->nr_ring_pages * XEN_PAGE_SIZE;
|
||||
grant_ref_t gref[XENBUS_MAX_RING_GRANTS];
|
||||
|
||||
for (i = 0; i < info->nr_ring_pages; i++)
|
||||
info->ring_ref[i] = GRANT_INVALID_REF;
|
||||
rinfo->ring_ref[i] = GRANT_INVALID_REF;
|
||||
|
||||
sring = (struct blkif_sring *)__get_free_pages(GFP_NOIO | __GFP_HIGH,
|
||||
get_order(ring_size));
|
||||
@ -1425,29 +1452,29 @@ static int setup_blkring(struct xenbus_device *dev,
|
||||
return -ENOMEM;
|
||||
}
|
||||
SHARED_RING_INIT(sring);
|
||||
FRONT_RING_INIT(&info->ring, sring, ring_size);
|
||||
FRONT_RING_INIT(&rinfo->ring, sring, ring_size);
|
||||
|
||||
err = xenbus_grant_ring(dev, info->ring.sring, info->nr_ring_pages, gref);
|
||||
err = xenbus_grant_ring(dev, rinfo->ring.sring, info->nr_ring_pages, gref);
|
||||
if (err < 0) {
|
||||
free_pages((unsigned long)sring, get_order(ring_size));
|
||||
info->ring.sring = NULL;
|
||||
rinfo->ring.sring = NULL;
|
||||
goto fail;
|
||||
}
|
||||
for (i = 0; i < info->nr_ring_pages; i++)
|
||||
info->ring_ref[i] = gref[i];
|
||||
rinfo->ring_ref[i] = gref[i];
|
||||
|
||||
err = xenbus_alloc_evtchn(dev, &info->evtchn);
|
||||
err = xenbus_alloc_evtchn(dev, &rinfo->evtchn);
|
||||
if (err)
|
||||
goto fail;
|
||||
|
||||
err = bind_evtchn_to_irqhandler(info->evtchn, blkif_interrupt, 0,
|
||||
"blkif", info);
|
||||
err = bind_evtchn_to_irqhandler(rinfo->evtchn, blkif_interrupt, 0,
|
||||
"blkif", rinfo);
|
||||
if (err <= 0) {
|
||||
xenbus_dev_fatal(dev, err,
|
||||
"bind_evtchn_to_irqhandler failed");
|
||||
goto fail;
|
||||
}
|
||||
info->irq = err;
|
||||
rinfo->irq = err;
|
||||
|
||||
return 0;
|
||||
fail:
|
||||
@ -1465,6 +1492,7 @@ static int talk_to_blkback(struct xenbus_device *dev,
|
||||
int err, i;
|
||||
unsigned int max_page_order = 0;
|
||||
unsigned int ring_page_order = 0;
|
||||
struct blkfront_ring_info *rinfo = &info->rinfo;
|
||||
|
||||
err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
|
||||
"max-ring-page-order", "%u", &max_page_order);
|
||||
@ -1476,7 +1504,7 @@ static int talk_to_blkback(struct xenbus_device *dev,
|
||||
}
|
||||
|
||||
/* Create shared ring, alloc event channel. */
|
||||
err = setup_blkring(dev, info);
|
||||
err = setup_blkring(dev, rinfo);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
@ -1489,7 +1517,7 @@ again:
|
||||
|
||||
if (info->nr_ring_pages == 1) {
|
||||
err = xenbus_printf(xbt, dev->nodename,
|
||||
"ring-ref", "%u", info->ring_ref[0]);
|
||||
"ring-ref", "%u", rinfo->ring_ref[0]);
|
||||
if (err) {
|
||||
message = "writing ring-ref";
|
||||
goto abort_transaction;
|
||||
@ -1507,7 +1535,7 @@ again:
|
||||
|
||||
snprintf(ring_ref_name, RINGREF_NAME_LEN, "ring-ref%u", i);
|
||||
err = xenbus_printf(xbt, dev->nodename, ring_ref_name,
|
||||
"%u", info->ring_ref[i]);
|
||||
"%u", rinfo->ring_ref[i]);
|
||||
if (err) {
|
||||
message = "writing ring-ref";
|
||||
goto abort_transaction;
|
||||
@ -1515,7 +1543,7 @@ again:
|
||||
}
|
||||
}
|
||||
err = xenbus_printf(xbt, dev->nodename,
|
||||
"event-channel", "%u", info->evtchn);
|
||||
"event-channel", "%u", rinfo->evtchn);
|
||||
if (err) {
|
||||
message = "writing event-channel";
|
||||
goto abort_transaction;
|
||||
@ -1541,8 +1569,8 @@ again:
|
||||
}
|
||||
|
||||
for (i = 0; i < BLK_RING_SIZE(info); i++)
|
||||
info->shadow[i].req.u.rw.id = i+1;
|
||||
info->shadow[BLK_RING_SIZE(info)-1].req.u.rw.id = 0x0fffffff;
|
||||
rinfo->shadow[i].req.u.rw.id = i+1;
|
||||
rinfo->shadow[BLK_RING_SIZE(info)-1].req.u.rw.id = 0x0fffffff;
|
||||
xenbus_switch_state(dev, XenbusStateInitialised);
|
||||
|
||||
return 0;
|
||||
@ -1568,6 +1596,7 @@ static int blkfront_probe(struct xenbus_device *dev,
|
||||
{
|
||||
int err, vdevice;
|
||||
struct blkfront_info *info;
|
||||
struct blkfront_ring_info *rinfo;
|
||||
|
||||
/* FIXME: Use dynamic device id if this is not set. */
|
||||
err = xenbus_scanf(XBT_NIL, dev->nodename,
|
||||
@ -1617,15 +1646,18 @@ static int blkfront_probe(struct xenbus_device *dev,
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
rinfo = &info->rinfo;
|
||||
INIT_LIST_HEAD(&rinfo->indirect_pages);
|
||||
rinfo->dev_info = info;
|
||||
INIT_WORK(&rinfo->work, blkif_restart_queue);
|
||||
|
||||
mutex_init(&info->mutex);
|
||||
spin_lock_init(&info->io_lock);
|
||||
info->xbdev = dev;
|
||||
info->vdevice = vdevice;
|
||||
INIT_LIST_HEAD(&info->grants);
|
||||
INIT_LIST_HEAD(&info->indirect_pages);
|
||||
info->persistent_gnts_c = 0;
|
||||
info->connected = BLKIF_STATE_DISCONNECTED;
|
||||
INIT_WORK(&info->work, blkif_restart_queue);
|
||||
|
||||
/* Front end dir is a number, which is used as the id. */
|
||||
info->handle = simple_strtoul(strrchr(dev->nodename, '/')+1, NULL, 0);
|
||||
@ -1659,19 +1691,20 @@ static int blkif_recover(struct blkfront_info *info)
|
||||
int pending, size;
|
||||
struct split_bio *split_bio;
|
||||
struct list_head requests;
|
||||
struct blkfront_ring_info *rinfo = &info->rinfo;
|
||||
|
||||
/* Stage 1: Make a safe copy of the shadow state. */
|
||||
copy = kmemdup(info->shadow, sizeof(info->shadow),
|
||||
copy = kmemdup(rinfo->shadow, sizeof(rinfo->shadow),
|
||||
GFP_NOIO | __GFP_REPEAT | __GFP_HIGH);
|
||||
if (!copy)
|
||||
return -ENOMEM;
|
||||
|
||||
/* Stage 2: Set up free list. */
|
||||
memset(&info->shadow, 0, sizeof(info->shadow));
|
||||
memset(&rinfo->shadow, 0, sizeof(rinfo->shadow));
|
||||
for (i = 0; i < BLK_RING_SIZE(info); i++)
|
||||
info->shadow[i].req.u.rw.id = i+1;
|
||||
info->shadow_free = info->ring.req_prod_pvt;
|
||||
info->shadow[BLK_RING_SIZE(info)-1].req.u.rw.id = 0x0fffffff;
|
||||
rinfo->shadow[i].req.u.rw.id = i+1;
|
||||
rinfo->shadow_free = rinfo->ring.req_prod_pvt;
|
||||
rinfo->shadow[BLK_RING_SIZE(info)-1].req.u.rw.id = 0x0fffffff;
|
||||
|
||||
rc = blkfront_gather_backend_features(info);
|
||||
if (rc) {
|
||||
@ -1717,7 +1750,7 @@ static int blkif_recover(struct blkfront_info *info)
|
||||
info->connected = BLKIF_STATE_CONNECTED;
|
||||
|
||||
/* Kick any other new requests queued since we resumed */
|
||||
kick_pending_request_queues(info);
|
||||
kick_pending_request_queues(rinfo);
|
||||
|
||||
list_for_each_entry_safe(req, n, &requests, queuelist) {
|
||||
/* Requeue pending requests (flush or discard) */
|
||||
@ -1851,10 +1884,11 @@ static void blkfront_setup_discard(struct blkfront_info *info)
|
||||
info->feature_secdiscard = !!discard_secure;
|
||||
}
|
||||
|
||||
static int blkfront_setup_indirect(struct blkfront_info *info)
|
||||
static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo)
|
||||
{
|
||||
unsigned int psegs, grants;
|
||||
int err, i;
|
||||
struct blkfront_info *info = rinfo->dev_info;
|
||||
|
||||
if (info->max_indirect_segments == 0)
|
||||
grants = BLKIF_MAX_SEGMENTS_PER_REQUEST;
|
||||
@ -1862,7 +1896,7 @@ static int blkfront_setup_indirect(struct blkfront_info *info)
|
||||
grants = info->max_indirect_segments;
|
||||
psegs = grants / GRANTS_PER_PSEG;
|
||||
|
||||
err = fill_grant_buffer(info,
|
||||
err = fill_grant_buffer(rinfo,
|
||||
(grants + INDIRECT_GREFS(grants)) * BLK_RING_SIZE(info));
|
||||
if (err)
|
||||
goto out_of_memory;
|
||||
@ -1875,31 +1909,31 @@ static int blkfront_setup_indirect(struct blkfront_info *info)
|
||||
*/
|
||||
int num = INDIRECT_GREFS(grants) * BLK_RING_SIZE(info);
|
||||
|
||||
BUG_ON(!list_empty(&info->indirect_pages));
|
||||
BUG_ON(!list_empty(&rinfo->indirect_pages));
|
||||
for (i = 0; i < num; i++) {
|
||||
struct page *indirect_page = alloc_page(GFP_NOIO);
|
||||
if (!indirect_page)
|
||||
goto out_of_memory;
|
||||
list_add(&indirect_page->lru, &info->indirect_pages);
|
||||
list_add(&indirect_page->lru, &rinfo->indirect_pages);
|
||||
}
|
||||
}
|
||||
|
||||
for (i = 0; i < BLK_RING_SIZE(info); i++) {
|
||||
info->shadow[i].grants_used = kzalloc(
|
||||
sizeof(info->shadow[i].grants_used[0]) * grants,
|
||||
rinfo->shadow[i].grants_used = kzalloc(
|
||||
sizeof(rinfo->shadow[i].grants_used[0]) * grants,
|
||||
GFP_NOIO);
|
||||
info->shadow[i].sg = kzalloc(sizeof(info->shadow[i].sg[0]) * psegs, GFP_NOIO);
|
||||
rinfo->shadow[i].sg = kzalloc(sizeof(rinfo->shadow[i].sg[0]) * psegs, GFP_NOIO);
|
||||
if (info->max_indirect_segments)
|
||||
info->shadow[i].indirect_grants = kzalloc(
|
||||
sizeof(info->shadow[i].indirect_grants[0]) *
|
||||
rinfo->shadow[i].indirect_grants = kzalloc(
|
||||
sizeof(rinfo->shadow[i].indirect_grants[0]) *
|
||||
INDIRECT_GREFS(grants),
|
||||
GFP_NOIO);
|
||||
if ((info->shadow[i].grants_used == NULL) ||
|
||||
(info->shadow[i].sg == NULL) ||
|
||||
if ((rinfo->shadow[i].grants_used == NULL) ||
|
||||
(rinfo->shadow[i].sg == NULL) ||
|
||||
(info->max_indirect_segments &&
|
||||
(info->shadow[i].indirect_grants == NULL)))
|
||||
(rinfo->shadow[i].indirect_grants == NULL)))
|
||||
goto out_of_memory;
|
||||
sg_init_table(info->shadow[i].sg, psegs);
|
||||
sg_init_table(rinfo->shadow[i].sg, psegs);
|
||||
}
|
||||
|
||||
|
||||
@ -1907,16 +1941,16 @@ static int blkfront_setup_indirect(struct blkfront_info *info)
|
||||
|
||||
out_of_memory:
|
||||
for (i = 0; i < BLK_RING_SIZE(info); i++) {
|
||||
kfree(info->shadow[i].grants_used);
|
||||
info->shadow[i].grants_used = NULL;
|
||||
kfree(info->shadow[i].sg);
|
||||
info->shadow[i].sg = NULL;
|
||||
kfree(info->shadow[i].indirect_grants);
|
||||
info->shadow[i].indirect_grants = NULL;
|
||||
kfree(rinfo->shadow[i].grants_used);
|
||||
rinfo->shadow[i].grants_used = NULL;
|
||||
kfree(rinfo->shadow[i].sg);
|
||||
rinfo->shadow[i].sg = NULL;
|
||||
kfree(rinfo->shadow[i].indirect_grants);
|
||||
rinfo->shadow[i].indirect_grants = NULL;
|
||||
}
|
||||
if (!list_empty(&info->indirect_pages)) {
|
||||
if (!list_empty(&rinfo->indirect_pages)) {
|
||||
struct page *indirect_page, *n;
|
||||
list_for_each_entry_safe(indirect_page, n, &info->indirect_pages, lru) {
|
||||
list_for_each_entry_safe(indirect_page, n, &rinfo->indirect_pages, lru) {
|
||||
list_del(&indirect_page->lru);
|
||||
__free_page(indirect_page);
|
||||
}
|
||||
@ -1983,7 +2017,7 @@ static int blkfront_gather_backend_features(struct blkfront_info *info)
|
||||
info->max_indirect_segments = min(indirect_segments,
|
||||
xen_blkif_max_segments);
|
||||
|
||||
return blkfront_setup_indirect(info);
|
||||
return blkfront_setup_indirect(&info->rinfo);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -1997,6 +2031,7 @@ static void blkfront_connect(struct blkfront_info *info)
|
||||
unsigned int physical_sector_size;
|
||||
unsigned int binfo;
|
||||
int err;
|
||||
struct blkfront_ring_info *rinfo = &info->rinfo;
|
||||
|
||||
switch (info->connected) {
|
||||
case BLKIF_STATE_CONNECTED:
|
||||
@ -2073,7 +2108,7 @@ static void blkfront_connect(struct blkfront_info *info)
|
||||
/* Kick pending requests. */
|
||||
spin_lock_irq(&info->io_lock);
|
||||
info->connected = BLKIF_STATE_CONNECTED;
|
||||
kick_pending_request_queues(info);
|
||||
kick_pending_request_queues(rinfo);
|
||||
spin_unlock_irq(&info->io_lock);
|
||||
|
||||
add_disk(info->gd);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user