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authorJon Derrick <jonathan.derrick@intel.com>2017-08-16 09:51:29 +0200
committerChristoph Hellwig <hch@lst.de>2017-08-28 21:38:18 +0200
commitdbf86b39005d26b21c52a23720e15fb850d71cdc (patch)
tree1d7d0d819fe95cc24dae0fe1641203edb71c1d59 /drivers/nvme
parent62346eaeb2f1a0524b35eaa2f479596f40491165 (diff)
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: Jon 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: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/host/core.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index a6afeedc009a..0b979e16655e 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -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)
{
/*
@@ -1861,6 +1878,10 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
ret = nvme_configure_apst(ctrl);
if (ret < 0)
return ret;
+
+ ret = nvme_configure_timestamp(ctrl);
+ if (ret < 0)
+ return ret;
ret = nvme_configure_directives(ctrl);
if (ret < 0)