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nvme: honor RTD3 Entry Latency for shutdowns 

If an NVMe controller reports RTD3 Entry Latency larger than
shutdown_timeout, up to a maximum of 60 seconds, use that value to set
the shutdown timer. Otherwise fall back to the module parameter which
defaults to 5 seconds.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
[hch: removed do_div, made transition time local scope]
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Martin K. Petersen 2017-08-25 19:14:50 -04:00 committed by Sagi Grimberg
parent 5228b3280b
commit 07fbd32a6b
2 changed files with 16 additions and 1 deletions
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16
drivers/nvme/host/core.c
View File

@ -1458,7 +1458,7 @@ EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
{
unsigned long timeout = jiffies + (shutdown_timeout * HZ);
unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ);
u32 csts;
int ret;
@ -1826,6 +1826,20 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
ctrl->sgls = le32_to_cpu(id->sgls);
ctrl->kas = le16_to_cpu(id->kas);
if (id->rtd3e) {
/* us -> s */
u32 transition_time = le32_to_cpu(id->rtd3e) / 1000000;
ctrl->shutdown_timeout = clamp_t(unsigned int, transition_time,
shutdown_timeout, 60);
if (ctrl->shutdown_timeout != shutdown_timeout)
dev_warn(ctrl->device,
"Shutdown timeout set to %u seconds\n",
ctrl->shutdown_timeout);
} else
ctrl->shutdown_timeout = shutdown_timeout;
ctrl->npss = id->npss;
ctrl->apsta = id->apsta;
prev_apst_enabled = ctrl->apst_enabled;

1
drivers/nvme/host/nvme.h
View File

@ -162,6 +162,7 @@ struct nvme_ctrl {
u16 kas;
u8 npss;
u8 apsta;
unsigned int shutdown_timeout;
unsigned int kato;
bool subsystem;
unsigned long quirks;