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scsi: hisi_sas: Add manual trigger for debugfs dump 

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>
This commit is contained in:
Luo Jiaxing 2019-02-06 18:52:52 +08:00 committed by Martin K. Petersen
parent b3cce125cb
commit 7c5e136363
1 changed files with 34 additions and 0 deletions
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34
drivers/scsi/hisi_sas/hisi_sas_main.c
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@ -2977,6 +2977,36 @@ static void hisi_sas_debugfs_snapshot_regs(struct hisi_hba *hisi_hba)
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 =
@ -2999,6 +3029,10 @@ void hisi_sas_debugfs_init(struct hisi_hba *hisi_hba)
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;