[PATCH 11/18] nvme: split __nvme_submit_sync_cmd
Christoph Hellwig
hch at lst.de
Thu Oct 15 22:58:41 PDT 2015
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 at lst.de>
---
drivers/nvme/host/core.c | 82 ++++++++++++++++++++++++++++++++++--------------
drivers/nvme/host/nvme.h | 6 ++--
drivers/nvme/host/pci.c | 6 ++--
drivers/nvme/host/scsi.c | 4 +--
4 files changed, 67 insertions(+), 31 deletions(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index e2e8818..9d05df0 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -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)
+static struct request *nvme_alloc_request(struct request_queue *q,
+ struct nvme_command *cmd)
{
bool write = cmd->common.opcode & 1;
- struct bio *bio = NULL;
struct request *req;
- int ret;
req = blk_mq_alloc_request(q, write, GFP_KERNEL, false);
if (IS_ERR(req))
- return PTR_ERR(req);
+ return req;
req->cmd_type = REQ_TYPE_DRV_PRIV;
req->cmd_flags |= REQ_FAILFAST_DRIVER;
@@ -44,26 +37,36 @@ 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);
+ 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_WAIT);
if (ret)
goto out;
- } else if (ubuffer && bufflen) {
- ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, __GFP_WAIT);
- if (ret)
- goto out;
- bio = req->bio;
}
blk_execute_rq(req->q, NULL, req, 0);
- if (bio)
- blk_rq_unmap_user(bio);
if (result)
*result = (u32)(uintptr_t)req->special;
ret = req->errors;
@@ -75,7 +78,40 @@ int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
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);
+ 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);
+ 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_WAIT);
+ if (ret)
+ goto out;
+ bio = req->bio;
+ }
+
+ blk_execute_rq(req->q, NULL, req, 0);
+ if (bio)
+ blk_rq_unmap_user(bio);
+ if (result)
+ *result = (u32)(uintptr_t)req->special;
+ ret = req->errors;
+ out:
+ blk_mq_free_request(req);
+ return ret;
}
int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
@@ -130,8 +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,
@@ -145,8 +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)
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 6c77db7..faa10f0 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -146,8 +146,10 @@ static inline int nvme_error_status(u16 status)
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);
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index d742efe..be0ae02 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1677,7 +1677,7 @@ 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) {
@@ -1719,8 +1719,8 @@ 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))
diff --git a/drivers/nvme/host/scsi.c b/drivers/nvme/host/scsi.c
index 00d0bdd..b673fe4 100644
--- a/drivers/nvme/host/scsi.c
+++ b/drivers/nvme/host/scsi.c
@@ -1295,7 +1295,7 @@ 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);
}
@@ -1699,7 +1699,7 @@ 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;
--
1.9.1
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