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nvmet: add error-log definitions

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This patch adds necessary fields in the target data structures to
support error log page. For a target controller, we add a new error log
field to maintain the error log, at any given point we maintain error
entries equal to NVMET_ERROR_LOG_SLOTS for each controller. In the
following patch, we also update the error log page entry in the I/O
completion path so we introduce a spinlock for synchronization of the
log.

For nvmet_req, we add a new field error_loc to hold the location of
the error in the command when the actual error occurs for each request
and a starting LBA if applicable.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Chaitanya Kulkarni 2018-12-12 15:11:39 -08:00 committed by Christoph Hellwig
parent b34de7cee0
commit e4a976254e
2 changed files with 11 additions and 0 deletions
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5
drivers/nvme/target/core.c
View File

@ -769,6 +769,8 @@ bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
req->rsp->status = 0;
req->rsp->sq_head = 0;
req->ns = NULL;
req->error_loc = -1;
req->error_slba = 0;
/* no support for fused commands yet */
if (unlikely(flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND))) {
@ -1174,6 +1176,9 @@ u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
/* keep-alive timeout in seconds */
ctrl->kato = DIV_ROUND_UP(kato, 1000);
ctrl->err_counter = 0;
spin_lock_init(&ctrl->error_lock);
nvmet_start_keep_alive_timer(ctrl);
mutex_lock(&subsys->lock);

6
drivers/nvme/target/nvmet.h
View File

@ -202,6 +202,10 @@ struct nvmet_ctrl {
struct device *p2p_client;
struct radix_tree_root p2p_ns_map;
spinlock_t error_lock;
u64 err_counter;
struct nvme_error_slot slots[NVMET_ERROR_LOG_SLOTS];
};
struct nvmet_subsys {
@ -317,6 +321,8 @@ struct nvmet_req {
struct pci_dev *p2p_dev;
struct device *p2p_client;
u16 error_loc;
u64 error_slba;
};
extern struct workqueue_struct *buffered_io_wq;