Commit 07fbd32a authored by Martin K. Petersen's avatar Martin K. Petersen Committed by Sagi Grimberg

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: default avatarMartin K. Petersen <>
Reviewed-by: default avatarSagi Grimberg <>
[hch: removed do_div, made transition time local scope]
Signed-off-by: default avatarChristoph Hellwig <>
parent 5228b328
......@@ -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)
"Shutdown timeout set to %u seconds\n",
} else
ctrl->shutdown_timeout = shutdown_timeout;
ctrl->npss = id->npss;
ctrl->apsta = id->apsta;
prev_apst_enabled = ctrl->apst_enabled;
......@@ -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;
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