linux-kernel - [PATCH v2 05/18] scsi: hisi_sas: Add timestamp for a debugfs dump

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Message-ID: <1571926105-74636-6-git-send-email-john.garry@huawei.com>
Date:   Thu, 24 Oct 2019 22:08:12 +0800
From:   John Garry <john.garry@...wei.com>
To:     <jejb@...ux.vnet.ibm.com>, <martin.petersen@...cle.com>
CC:     <linux-scsi@...r.kernel.org>, <linuxarm@...wei.com>,
        <linux-kernel@...r.kernel.org>,
        Luo Jiaxing <luojiaxing@...wei.com>,
        "John Garry" <john.garry@...wei.com>
Subject: [PATCH v2 05/18] scsi: hisi_sas: Add timestamp for a debugfs dump

From: Luo Jiaxing <luojiaxing@...wei.com>

It's useful to know when the dump occurred, so add a timestamp file for
this.

Signed-off-by: Luo Jiaxing <luojiaxing@...wei.com>
Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/scsi/hisi_sas/hisi_sas.h      | 2 ++
 drivers/scsi/hisi_sas/hisi_sas_main.c | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index 83232e8472fb..7069dae4cec9 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -21,6 +21,7 @@
 #include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/regmap.h>
+#include <linux/timer.h>
 #include <scsi/sas_ata.h>
 #include <scsi/libsas.h>
 
@@ -410,6 +411,7 @@ struct hisi_hba {
 	struct hisi_sas_iost *debugfs_iost;
 	struct hisi_sas_itct *debugfs_itct;
 	u64 *debugfs_iost_cache;
+	u64 debugfs_timestamp;
 	u64 *debugfs_itct_cache;
 
 	struct dentry *debugfs_dir;
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index a7bac5dc389a..a0d04e4e13e2 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -3194,6 +3194,7 @@ static const struct file_operations hisi_sas_debugfs_itct_cache_fops = {
 
 static void hisi_sas_debugfs_create_files(struct hisi_hba *hisi_hba)
 {
+	u64 *debugfs_timestamp;
 	struct dentry *dump_dentry;
 	struct dentry *dentry;
 	char name[256];
@@ -3201,10 +3202,14 @@ static void hisi_sas_debugfs_create_files(struct hisi_hba *hisi_hba)
 	int c;
 	int d;
 
+	debugfs_timestamp = &hisi_hba->debugfs_timestamp;
 	/* Create dump dir inside device dir */
 	dump_dentry = debugfs_create_dir("dump", hisi_hba->debugfs_dir);
 	hisi_hba->debugfs_dump_dentry = dump_dentry;
 
+	debugfs_create_u64("timestamp", 0400, dump_dentry,
+			   debugfs_timestamp);
+
 	debugfs_create_file("global", 0400, dump_dentry, hisi_hba,
 			    &hisi_sas_debugfs_global_fops);
 
@@ -3684,7 +3689,10 @@ void hisi_sas_debugfs_work_handler(struct work_struct *work)
 {
 	struct hisi_hba *hisi_hba =
 		container_of(work, struct hisi_hba, debugfs_work);
+	u64 timestamp = local_clock();
 
+	do_div(timestamp, NSEC_PER_MSEC);
+	hisi_hba->debugfs_timestamp = timestamp;
 	if (hisi_hba->debugfs_snapshot)
 		return;
 	hisi_hba->debugfs_snapshot = true;
-- 
2.17.1