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nvmet: add error log page cmd handler 

Now that we have support for all the major parts of the target we add
a NVMe error log page handler so that host can read the log page.

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 15:11:47 -08:00 committed by Christoph Hellwig
parent c6aa3542e0
commit 11ad507784
1 changed files with 29 additions and 7 deletions
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36
drivers/nvme/target/admin-cmd.c
View File

@ -37,6 +37,34 @@ static void nvmet_execute_get_log_page_noop(struct nvmet_req *req)
nvmet_req_complete(req, nvmet_zero_sgl(req, 0, req->data_len));
}
static void nvmet_execute_get_log_page_error(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
u16 status = NVME_SC_SUCCESS;
unsigned long flags;
off_t offset = 0;
u64 slot;
u64 i;
spin_lock_irqsave(&ctrl->error_lock, flags);
slot = ctrl->err_counter % NVMET_ERROR_LOG_SLOTS;
for (i = 0; i < NVMET_ERROR_LOG_SLOTS; i++) {
status = nvmet_copy_to_sgl(req, offset, &ctrl->slots[slot],
sizeof(struct nvme_error_slot));
if (status)
break;
if (slot == 0)
slot = NVMET_ERROR_LOG_SLOTS - 1;
else
slot--;
offset += sizeof(struct nvme_error_slot);
}
spin_unlock_irqrestore(&ctrl->error_lock, flags);
nvmet_req_complete(req, status);
}
static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req,
struct nvme_smart_log *slog)
{
@ -789,13 +817,7 @@ u16 nvmet_parse_admin_cmd(struct nvmet_req *req)
switch (cmd->get_log_page.lid) {
case NVME_LOG_ERROR:
/*
* We currently never set the More bit in the status
* field, so all error log entries are invalid and can
* be zeroed out. This is called a minum viable
* implementation (TM) of this mandatory log page.
*/
req->execute = nvmet_execute_get_log_page_noop;
req->execute = nvmet_execute_get_log_page_error;
return 0;
case NVME_LOG_SMART:
req->execute = nvmet_execute_get_log_page_smart;