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nvme: split __nvme_submit_sync_cmd

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Add a separate nvme_submit_user_cmd for commands that directly DMA
to or from userspace.  We'll add metadata support to that soon and
the common version would become too messy.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2015-11-20 09:00:02 +01:00 committed by Jens Axboe
parent 22944e9981
commit 4160982e75
4 changed files with 68 additions and 31 deletions
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81
drivers/nvme/host/core.c
View File

@ -21,22 +21,15 @@
#include "nvme.h"
/*
* Returns 0 on success. If the result is negative, it's a Linux error code;
* if the result is positive, it's an NVM Express status code
*/
int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
void *buffer, void __user *ubuffer, unsigned bufflen,
u32 *result, unsigned timeout)
struct request *nvme_alloc_request(struct request_queue *q,
struct nvme_command *cmd, unsigned int flags)
{
bool write = cmd->common.opcode & 1;
struct bio *bio = NULL;
struct request *req;
int ret;
req = blk_mq_alloc_request(q, write, 0);
req = blk_mq_alloc_request(q, write, flags);
if (IS_ERR(req))
return PTR_ERR(req);
return req;
req->cmd_type = REQ_TYPE_DRV_PRIV;
req->cmd_flags |= REQ_FAILFAST_DRIVER;
@ -44,17 +37,65 @@ int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
req->__sector = (sector_t) -1;
req->bio = req->biotail = NULL;
req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
req->cmd = (unsigned char *)cmd;
req->cmd_len = sizeof(struct nvme_command);
req->special = (void *)0;
return req;
}
/*
* Returns 0 on success. If the result is negative, it's a Linux error code;
* if the result is positive, it's an NVM Express status code
*/
int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
void *buffer, unsigned bufflen, u32 *result, unsigned timeout)
{
struct request *req;
int ret;
req = nvme_alloc_request(q, cmd, 0);
if (IS_ERR(req))
return PTR_ERR(req);
req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
if (buffer && bufflen) {
ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
if (ret)
goto out;
} else if (ubuffer && bufflen) {
}
blk_execute_rq(req->q, NULL, req, 0);
if (result)
*result = (u32)(uintptr_t)req->special;
ret = req->errors;
out:
blk_mq_free_request(req);
return ret;
}
int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
void *buffer, unsigned bufflen)
{
return __nvme_submit_sync_cmd(q, cmd, buffer, bufflen, NULL, 0);
}
int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
void __user *ubuffer, unsigned bufflen, u32 *result,
unsigned timeout)
{
struct bio *bio = NULL;
struct request *req;
int ret;
req = nvme_alloc_request(q, cmd, 0);
if (IS_ERR(req))
return PTR_ERR(req);
req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
if (ubuffer && bufflen) {
ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
GFP_KERNEL);
if (ret)
@ -73,12 +114,6 @@ int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
return ret;
}
int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
void *buffer, unsigned bufflen)
{
return __nvme_submit_sync_cmd(q, cmd, buffer, NULL, bufflen, NULL, 0);
}
int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
{
struct nvme_command c = { };
@ -131,8 +166,7 @@ int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
c.features.prp1 = cpu_to_le64(dma_addr);
c.features.fid = cpu_to_le32(fid);
return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, NULL, 0,
result, 0);
return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0);
}
int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
@ -146,8 +180,7 @@ int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
c.features.fid = cpu_to_le32(fid);
c.features.dword11 = cpu_to_le32(dword11);
return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, NULL, 0,
result, 0);
return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0);
}
int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log)

8
drivers/nvme/host/nvme.h
View File

@ -148,11 +148,15 @@ static inline int nvme_error_status(u16 status)
}
}
struct request *nvme_alloc_request(struct request_queue *q,
struct nvme_command *cmd, unsigned int flags);
int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
void *buf, unsigned bufflen);
int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
void *buffer, void __user *ubuffer, unsigned bufflen,
u32 *result, unsigned timeout);
void *buffer, unsigned bufflen, u32 *result, unsigned timeout);
int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
void __user *ubuffer, unsigned bufflen, u32 *result,
unsigned timeout);
int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id);
int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
struct nvme_id_ns **id);

6
drivers/nvme/host/pci.c
View File

@ -1697,7 +1697,7 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
c.rw.appmask = cpu_to_le16(io.appmask);
c.rw.metadata = cpu_to_le64(meta_dma);
status = __nvme_submit_sync_cmd(ns->queue, &c, NULL,
status = nvme_submit_user_cmd(ns->queue, &c,
(void __user *)(uintptr_t)io.addr, length, NULL, 0);
unmap:
if (meta) {
@ -1739,8 +1739,8 @@ static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
if (cmd.timeout_ms)
timeout = msecs_to_jiffies(cmd.timeout_ms);
status = __nvme_submit_sync_cmd(ns ? ns->queue : ctrl->admin_q, &c,
NULL, (void __user *)(uintptr_t)cmd.addr, cmd.data_len,
status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
(void __user *)(uintptr_t)cmd.addr, cmd.data_len,
&cmd.result, timeout);
if (status >= 0) {
if (put_user(cmd.result, &ucmd->result))

4
drivers/nvme/host/scsi.c
View File

@ -1327,7 +1327,7 @@ static int nvme_trans_send_download_fw_cmd(struct nvme_ns *ns, struct sg_io_hdr
c.dlfw.numd = cpu_to_le32((tot_len/BYTES_TO_DWORDS) - 1);
c.dlfw.offset = cpu_to_le32(offset/BYTES_TO_DWORDS);
nvme_sc = __nvme_submit_sync_cmd(ns->ctrl->admin_q, &c, NULL,
nvme_sc = nvme_submit_user_cmd(ns->ctrl->admin_q, &c,
hdr->dxferp, tot_len, NULL, 0);
return nvme_trans_status_code(hdr, nvme_sc);
}
@ -1731,7 +1731,7 @@ static int nvme_trans_do_nvme_io(struct nvme_ns *ns, struct sg_io_hdr *hdr,
nvme_sc = NVME_SC_LBA_RANGE;
break;
}
nvme_sc = __nvme_submit_sync_cmd(ns->queue, &c, NULL,
nvme_sc = nvme_submit_user_cmd(ns->queue, &c,
next_mapping_addr, unit_len, NULL, 0);
if (nvme_sc)
break;