Commit dbf86b39 authored by Jon Derrick's avatar Jon Derrick Committed by Christoph Hellwig
Browse files

nvme: add support for NVMe 1.3 Timestamp Feature 



NVME's Timestamp feature allows controllers to be aware of the epoch
time in milliseconds. This patch adds the set features hook for various
transports through the identify path, so that resets and resumes can
update the controller as necessary.

Signed-off-by: default avatarJon Derrick <jonathan.derrick@intel.com>
[hch: rebased on top of nvme-4.13 error handling changes,
      changed nvme_configure_timestamp to return the status]
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 62346eae

drivers/nvme/host/core.c

+21 −0
Original line number Diff line number Diff line
@@ -1507,6 +1507,23 @@ static void nvme_set_queue_limits(struct nvme_ctrl *ctrl, 
	blk_queue_write_cache(q, vwc, vwc);

}



static int nvme_configure_timestamp(struct nvme_ctrl *ctrl)

{

	__le64 ts;

	int ret;



	if (!(ctrl->oncs & NVME_CTRL_ONCS_TIMESTAMP))

		return 0;



	ts = cpu_to_le64(ktime_to_ms(ktime_get_real()));

	ret = nvme_set_features(ctrl, NVME_FEAT_TIMESTAMP, 0, &ts, sizeof(ts),

			NULL);

	if (ret)

		dev_warn_once(ctrl->device,

			"could not set timestamp (%d)\n", ret);

	return ret;

}



static int nvme_configure_apst(struct nvme_ctrl *ctrl)

{

	/*
@@ -1862,6 +1879,10 @@ int nvme_init_identify(struct nvme_ctrl *ctrl) 
	if (ret < 0)

		return ret;

	

	ret = nvme_configure_timestamp(ctrl);

	if (ret < 0)

		return ret;



	ret = nvme_configure_directives(ctrl);

	if (ret < 0)

		return ret;

include/linux/nvme.h

+2 −0
Original line number Diff line number Diff line
@@ -254,6 +254,7 @@ enum { 
	NVME_CTRL_ONCS_WRITE_UNCORRECTABLE	= 1 << 1,

	NVME_CTRL_ONCS_DSM			= 1 << 2,

	NVME_CTRL_ONCS_WRITE_ZEROES		= 1 << 3,

	NVME_CTRL_ONCS_TIMESTAMP		= 1 << 6,

	NVME_CTRL_VWC_PRESENT			= 1 << 0,

	NVME_CTRL_OACS_SEC_SUPP                 = 1 << 0,

	NVME_CTRL_OACS_DIRECTIVES		= 1 << 5,
@@ -688,6 +689,7 @@ enum { 
	NVME_FEAT_ASYNC_EVENT	= 0x0b,

	NVME_FEAT_AUTO_PST	= 0x0c,

	NVME_FEAT_HOST_MEM_BUF	= 0x0d,

	NVME_FEAT_TIMESTAMP	= 0x0e,

	NVME_FEAT_KATO		= 0x0f,

	NVME_FEAT_SW_PROGRESS	= 0x80,

	NVME_FEAT_HOST_ID	= 0x81,

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