* nvme: lightnvm: return ppa completion status
@ 2016-02-11 11:36 ` Matias Bjørling
0 siblings, 0 replies; 6+ messages in thread
From: Matias Bjørling @ 2016-02-11 11:36 UTC (permalink / raw)
To: linux-block, linux-kernel, linux-nvme, hch; +Cc: Matias Bjørling
For LightNVM, the PPA completion status is communicated through DW0 and
DW1 of the completion queue entry. The patch is based on top of
Christoph's
"nvme: return the whole CQE through the request passthrough interface"
that exposes the full CQE during completion.
Matias Bjørling (1):
nvme: lightnvm: return ppa completion status
drivers/nvme/host/lightnvm.c | 17 +++++++++++++++--
include/linux/lightnvm.h | 1 +
2 files changed, 16 insertions(+), 2 deletions(-)
--
2.1.4
^ permalink raw reply [flat|nested] 6+ messages in thread
* nvme: lightnvm: return ppa completion status
@ 2016-02-11 11:36 ` Matias Bjørling
0 siblings, 0 replies; 6+ messages in thread
From: Matias Bjørling @ 2016-02-11 11:36 UTC (permalink / raw)
For LightNVM, the PPA completion status is communicated through DW0 and
DW1 of the completion queue entry. The patch is based on top of
Christoph's
"nvme: return the whole CQE through the request passthrough interface"
that exposes the full CQE during completion.
Matias Bj?rling (1):
nvme: lightnvm: return ppa completion status
drivers/nvme/host/lightnvm.c | 17 +++++++++++++++--
include/linux/lightnvm.h | 1 +
2 files changed, 16 insertions(+), 2 deletions(-)
--
2.1.4
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH] nvme: lightnvm: return ppa completion status
2016-02-11 11:36 ` Matias Bjørling
@ 2016-02-11 11:36 ` Matias Bjørling
-1 siblings, 0 replies; 6+ messages in thread
From: Matias Bjørling @ 2016-02-11 11:36 UTC (permalink / raw)
To: linux-block, linux-kernel, linux-nvme, hch; +Cc: Matias Bjørling
PPAs sent to device is separately acknowledge in a 64bit status
variable. The status is stored in DW0 and DW1 of the completion queue
entry. Store this status inside the nvm_rq for further processing.
This can later be used to implement retry techniques for failed writes
and reads.
Signed-off-by: Matias Bjørling <m@bjorling.me>
---
drivers/nvme/host/lightnvm.c | 17 +++++++++++++++--
include/linux/lightnvm.h | 1 +
2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
index 55dab93..bbb1dbf 100644
--- a/drivers/nvme/host/lightnvm.c
+++ b/drivers/nvme/host/lightnvm.c
@@ -146,6 +146,14 @@ struct nvme_nvm_command {
};
};
+struct nvme_nvm_completion {
+ __le64 result; /* Used by LightNVM to return ppa completions */
+ __le16 sq_head; /* how much of this queue may be reclaimed */
+ __le16 sq_id; /* submission queue that generated this entry */
+ __u16 command_id; /* of the command which completed */
+ __le16 status; /* did the command fail, and if so, why? */
+};
+
#define NVME_NVM_LP_MLC_PAIRS 886
struct nvme_nvm_lp_mlc {
__u16 num_pairs;
@@ -471,6 +479,10 @@ static inline void nvme_nvm_rqtocmd(struct request *rq, struct nvm_rq *rqd,
static void nvme_nvm_end_io(struct request *rq, int error)
{
struct nvm_rq *rqd = rq->end_io_data;
+ struct nvme_nvm_completion *cqe = rq->special;
+
+ if (cqe)
+ rqd->ppa_status = le64_to_cpu(cqe->result);
nvm_end_io(rqd, error);
@@ -490,7 +502,8 @@ static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
if (IS_ERR(rq))
return -ENOMEM;
- cmd = kzalloc(sizeof(struct nvme_nvm_command), GFP_KERNEL);
+ cmd = kzalloc(sizeof(struct nvme_nvm_command) +
+ sizeof(struct nvme_nvm_completion), GFP_KERNEL);
if (!cmd) {
blk_mq_free_request(rq);
return -ENOMEM;
@@ -509,7 +522,7 @@ static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
rq->cmd = (unsigned char *)cmd;
rq->cmd_len = sizeof(struct nvme_nvm_command);
- rq->special = (void *)0;
+ rq->special = cmd + 1;
rq->end_io_data = rqd;
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 0fb3745..201b2a3 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -242,6 +242,7 @@ struct nvm_rq {
uint16_t nr_pages;
uint16_t flags;
+ u64 ppa_status; /* ppa media status */
int error;
};
--
2.1.4
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH] nvme: lightnvm: return ppa completion status
@ 2016-02-11 11:36 ` Matias Bjørling
0 siblings, 0 replies; 6+ messages in thread
From: Matias Bjørling @ 2016-02-11 11:36 UTC (permalink / raw)
PPAs sent to device is separately acknowledge in a 64bit status
variable. The status is stored in DW0 and DW1 of the completion queue
entry. Store this status inside the nvm_rq for further processing.
This can later be used to implement retry techniques for failed writes
and reads.
Signed-off-by: Matias Bj?rling <m at bjorling.me>
---
drivers/nvme/host/lightnvm.c | 17 +++++++++++++++--
include/linux/lightnvm.h | 1 +
2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
index 55dab93..bbb1dbf 100644
--- a/drivers/nvme/host/lightnvm.c
+++ b/drivers/nvme/host/lightnvm.c
@@ -146,6 +146,14 @@ struct nvme_nvm_command {
};
};
+struct nvme_nvm_completion {
+ __le64 result; /* Used by LightNVM to return ppa completions */
+ __le16 sq_head; /* how much of this queue may be reclaimed */
+ __le16 sq_id; /* submission queue that generated this entry */
+ __u16 command_id; /* of the command which completed */
+ __le16 status; /* did the command fail, and if so, why? */
+};
+
#define NVME_NVM_LP_MLC_PAIRS 886
struct nvme_nvm_lp_mlc {
__u16 num_pairs;
@@ -471,6 +479,10 @@ static inline void nvme_nvm_rqtocmd(struct request *rq, struct nvm_rq *rqd,
static void nvme_nvm_end_io(struct request *rq, int error)
{
struct nvm_rq *rqd = rq->end_io_data;
+ struct nvme_nvm_completion *cqe = rq->special;
+
+ if (cqe)
+ rqd->ppa_status = le64_to_cpu(cqe->result);
nvm_end_io(rqd, error);
@@ -490,7 +502,8 @@ static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
if (IS_ERR(rq))
return -ENOMEM;
- cmd = kzalloc(sizeof(struct nvme_nvm_command), GFP_KERNEL);
+ cmd = kzalloc(sizeof(struct nvme_nvm_command) +
+ sizeof(struct nvme_nvm_completion), GFP_KERNEL);
if (!cmd) {
blk_mq_free_request(rq);
return -ENOMEM;
@@ -509,7 +522,7 @@ static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
rq->cmd = (unsigned char *)cmd;
rq->cmd_len = sizeof(struct nvme_nvm_command);
- rq->special = (void *)0;
+ rq->special = cmd + 1;
rq->end_io_data = rqd;
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 0fb3745..201b2a3 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -242,6 +242,7 @@ struct nvm_rq {
uint16_t nr_pages;
uint16_t flags;
+ u64 ppa_status; /* ppa media status */
int error;
};
--
2.1.4
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] nvme: lightnvm: return ppa completion status
2016-02-11 11:36 ` Matias Bjørling
@ 2016-02-13 10:01 ` Christoph Hellwig
-1 siblings, 0 replies; 6+ messages in thread
From: Christoph Hellwig @ 2016-02-13 10:01 UTC (permalink / raw)
To: Matias Bj??rling; +Cc: linux-block, linux-kernel, linux-nvme
On Thu, Feb 11, 2016 at 12:36:29PM +0100, Matias Bj??rling wrote:
> PPAs sent to device is separately acknowledge in a 64bit status
> variable. The status is stored in DW0 and DW1 of the completion queue
> entry. Store this status inside the nvm_rq for further processing.
>
> This can later be used to implement retry techniques for failed writes
> and reads.
>
> Signed-off-by: Matias Bj??rling <m@bjorling.me>
Looks reasonable:
Reviewed-by: Christoph Hellwig <hch@lst.de>
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH] nvme: lightnvm: return ppa completion status
@ 2016-02-13 10:01 ` Christoph Hellwig
0 siblings, 0 replies; 6+ messages in thread
From: Christoph Hellwig @ 2016-02-13 10:01 UTC (permalink / raw)
On Thu, Feb 11, 2016@12:36:29PM +0100, Matias Bj??rling wrote:
> PPAs sent to device is separately acknowledge in a 64bit status
> variable. The status is stored in DW0 and DW1 of the completion queue
> entry. Store this status inside the nvm_rq for further processing.
>
> This can later be used to implement retry techniques for failed writes
> and reads.
>
> Signed-off-by: Matias Bj??rling <m at bjorling.me>
Looks reasonable:
Reviewed-by: Christoph Hellwig <hch at lst.de>
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2016-02-13 10:01 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-02-11 11:36 nvme: lightnvm: return ppa completion status Matias Bjørling
2016-02-11 11:36 ` Matias Bjørling
2016-02-11 11:36 ` [PATCH] " Matias Bjørling
2016-02-11 11:36 ` Matias Bjørling
2016-02-13 10:01 ` Christoph Hellwig
2016-02-13 10:01 ` Christoph Hellwig
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