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authorChaitanya Kulkarni <ckulkarnilinux@gmail.com>2016-09-01 22:45:03 +0300
committerSagi Grimberg <sagi@grimberg.me>2016-09-24 01:37:37 +0300
commit2d79c7dc8fe5cf1158250a5fd25c02d781324cd3 (patch)
tree7ebc782814221d1da76dcf2a780d3464968528c5 /drivers/nvme
parent478bcb9388f2c3eedba34ed5811793400047f95d (diff)
downloadlinux-2d79c7dc8fe5cf1158250a5fd25c02d781324cd3.tar.xz
admin-cmd: Added smart-log command support.
This patch implements the support for smart-log command (NVM Express 1.2.1-section 5.10.1.2 SMART / Health Information (Log Identifier 02h)) on the target for NVMe over Fabric. In current implementation host can retrieve following statistics:- 1. Data Units Read. 2. Data Units Written. 3. Host Read Commands. 4. Host Write Commands. Signed-off-by: Chaitanya Kulkarni <ckulkarnilinux@gmail.com> Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/target/admin-cmd.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 47c564b5a289..7ab9c9381b98 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -14,6 +14,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <generated/utsrelease.h>
+#include <asm/unaligned.h>
#include "nvmet.h"
u32 nvmet_get_log_page_len(struct nvme_command *cmd)
@@ -29,8 +30,84 @@ u32 nvmet_get_log_page_len(struct nvme_command *cmd)
return len;
}
+static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req,
+ struct nvme_smart_log *slog)
+{
+ u16 status;
+ struct nvmet_ns *ns;
+ u64 host_reads, host_writes, data_units_read, data_units_written;
+
+ status = NVME_SC_SUCCESS;
+ ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->get_log_page.nsid);
+ if (!ns) {
+ status = NVME_SC_INVALID_NS;
+ pr_err("nvmet : Counld not find namespace id : %d\n",
+ le32_to_cpu(req->cmd->get_log_page.nsid));
+ goto out;
+ }
+
+ host_reads = part_stat_read(ns->bdev->bd_part, ios[READ]);
+ data_units_read = part_stat_read(ns->bdev->bd_part, sectors[READ]);
+ host_writes = part_stat_read(ns->bdev->bd_part, ios[WRITE]);
+ data_units_written = part_stat_read(ns->bdev->bd_part, sectors[WRITE]);
+
+ put_unaligned_le64(host_reads, &slog->host_reads[0]);
+ put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
+ put_unaligned_le64(host_writes, &slog->host_writes[0]);
+ put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
+ nvmet_put_namespace(ns);
+out:
+ return status;
+}
+
+static u16 nvmet_get_smart_log_all(struct nvmet_req *req,
+ struct nvme_smart_log *slog)
+{
+ u16 status;
+ u64 host_reads = 0, host_writes = 0;
+ u64 data_units_read = 0, data_units_written = 0;
+ struct nvmet_ns *ns;
+ struct nvmet_ctrl *ctrl;
+
+ status = NVME_SC_SUCCESS;
+ ctrl = req->sq->ctrl;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
+ host_reads += part_stat_read(ns->bdev->bd_part, ios[READ]);
+ data_units_read +=
+ part_stat_read(ns->bdev->bd_part, sectors[READ]);
+ host_writes += part_stat_read(ns->bdev->bd_part, ios[WRITE]);
+ data_units_written +=
+ part_stat_read(ns->bdev->bd_part, sectors[WRITE]);
+
+ }
+ rcu_read_unlock();
+
+ put_unaligned_le64(host_reads, &slog->host_reads[0]);
+ put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
+ put_unaligned_le64(host_writes, &slog->host_writes[0]);
+ put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
+
+ return status;
+}
+
+static u16 nvmet_get_smart_log(struct nvmet_req *req,
+ struct nvme_smart_log *slog)
+{
+ u16 status;
+
+ WARN_ON(req == NULL || slog == NULL);
+ if (req->cmd->get_log_page.nsid == 0xFFFFFFFF)
+ status = nvmet_get_smart_log_all(req, slog);
+ else
+ status = nvmet_get_smart_log_nsid(req, slog);
+ return status;
+}
+
static void nvmet_execute_get_log_page(struct nvmet_req *req)
{
+ struct nvme_smart_log *smart_log;
size_t data_len = nvmet_get_log_page_len(req->cmd);
void *buf;
u16 status = 0;
@@ -59,6 +136,16 @@ static void nvmet_execute_get_log_page(struct nvmet_req *req)
* available (e.g. units or commands read/written) those aren't
* persistent over power loss.
*/
+ if (data_len != sizeof(*smart_log)) {
+ status = NVME_SC_INTERNAL;
+ goto err;
+ }
+ smart_log = buf;
+ status = nvmet_get_smart_log(req, smart_log);
+ if (status) {
+ memset(buf, '\0', data_len);
+ goto err;
+ }
break;
case 0x03:
/*
@@ -73,6 +160,7 @@ static void nvmet_execute_get_log_page(struct nvmet_req *req)
status = nvmet_copy_to_sgl(req, 0, buf, data_len);
+err:
kfree(buf);
out:
nvmet_req_complete(req, status);