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nvme: allow a minimum of 10 seconds for shutdown

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Some devices may report a RTD3E time that is shorter than their actual
shutdown time in practice; force the timeout to be at least 10 seconds
to allow for a reasonable amount of shutdown time.

This doesn't add any extra delay for devices that do complete the
shutdown process within their reported RTD3E time, since we will return
as soon as the device reports that it is finished shutting down.

Change-Id: I365e66ba6a938400be516df170bd3ff288810caf
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-on: https://review.gerrithub.io/386719
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Daniel Verkamp 2017-11-10 15:51:02 -07:00
parent a0da65f49d
commit ffee381d82
1 changed files with 4 additions and 5 deletions
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9
lib/nvme/nvme_ctrlr.c
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@ -504,15 +504,14 @@ nvme_ctrlr_shutdown(struct spdk_nvme_ctrlr *ctrlr)
/*
* The NVMe specification defines RTD3E to be the time between
* setting SHN = 1 until the controller will set SHST = 10b.
* If the device doesn't report RTD3 entry latency, pick
* 5 seconds as a reasonable amount of time to
* If the device doesn't report RTD3 entry latency, or if it
* reports RTD3 entry latency less than 10 seconds, pick
* 10 seconds as a reasonable amount of time to
* wait before proceeding.
*/
SPDK_DEBUGLOG(SPDK_TRACE_NVME, "RTD3E = %" PRIu32 " us\n", ctrlr->cdata.rtd3e);
shutdown_timeout_ms = (ctrlr->cdata.rtd3e + 999) / 1000;
if (shutdown_timeout_ms == 0) {
shutdown_timeout_ms = 5000;
}
shutdown_timeout_ms = spdk_max(shutdown_timeout_ms, 10000);
SPDK_DEBUGLOG(SPDK_TRACE_NVME, "shutdown timeout = %" PRIu32 " ms\n", shutdown_timeout_ms);
do {