From: Luo Jiaxing <luojiaxing@huawei.com>
Date: Wed, 6 Feb 2019 18:52:52 +0800
Subject: scsi: hisi_sas: Add manual trigger for debugfs dump
Patch-mainline: v5.1-rc1
Git-commit: 7c5e136363919d8dfa27d4bcd4b3ecedfa234997
References: bsc#1140683
Add an interface to manually trigger a debugfs dump.
Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
drivers/scsi/hisi_sas/hisi_sas_main.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -2981,6 +2981,36 @@ static void hisi_sas_debugfs_snapshot_re
hisi_hba->hw->snapshot_restore(hisi_hba);
}
+static ssize_t hisi_sas_debugfs_trigger_dump_write(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct hisi_hba *hisi_hba = file->f_inode->i_private;
+ char buf[8];
+
+ /* A bit racy, but don't care too much since it's only debugfs */
+ if (hisi_hba->debugfs_snapshot)
+ return -EFAULT;
+
+ if (count > 8)
+ return -EFAULT;
+
+ if (copy_from_user(buf, user_buf, count))
+ return -EFAULT;
+
+ if (buf[0] != '1')
+ return -EFAULT;
+
+ queue_work(hisi_hba->wq, &hisi_hba->debugfs_work);
+
+ return count;
+}
+
+static const struct file_operations hisi_sas_debugfs_trigger_dump_fops = {
+ .write = &hisi_sas_debugfs_trigger_dump_write,
+ .owner = THIS_MODULE,
+};
+
void hisi_sas_debugfs_work_handler(struct work_struct *work)
{
struct hisi_hba *hisi_hba =
@@ -3003,6 +3033,10 @@ void hisi_sas_debugfs_init(struct hisi_h
hisi_hba->debugfs_dir = debugfs_create_dir(dev_name(dev),
hisi_sas_debugfs_dir);
+ debugfs_create_file("trigger_dump", 0600,
+ hisi_hba->debugfs_dir,
+ hisi_hba,
+ &hisi_sas_debugfs_trigger_dump_fops);
/* Alloc buffer for global */
sz = hisi_hba->hw->debugfs_reg_global->count * 4;