scsi: hisi_sas: Directly call register snapshot instead of using workqueue

Currently, register information dump is performed via workqueue, regardless
of the trigger mode (automatic or manual). There is a delay in dumping
register through workqueue, the exact register information at trigger time
cannot be obtained.

Call register snapshot directly instead of through a workqueue.

Signed-off-by: Yihang Li <liyihang9@huawei.com>
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Link: https://lore.kernel.org/r/1694571327-78697-3-git-send-email-chenxiang66@hisilicon.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: Yihang Li

drivers/scsi/hisi_sas/hisi_sas.h

@@ -451,7 +451,6 @@ struct hisi_hba {
 	const struct hisi_sas_hw *hw;	/* Low level hw interface */
 	unsigned long sata_dev_bitmap[BITS_TO_LONGS(HISI_SAS_MAX_DEVICES)];
 	struct work_struct rst_work;
-	struct work_struct debugfs_work;
 	u32 phy_state;
 	u32 intr_coal_ticks;	/* Time of interrupt coalesce in us */
 	u32 intr_coal_count;	/* Interrupt count to coalesce */

drivers/scsi/hisi_sas/hisi_sas_main.c

@@ -1958,8 +1958,11 @@ static bool hisi_sas_internal_abort_timeout(struct sas_task *task,
 	struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
 	struct hisi_sas_internal_abort_data *timeout = data;
 
-	if (hisi_sas_debugfs_enable && hisi_hba->debugfs_itct[0].itct)
-		queue_work(hisi_hba->wq, &hisi_hba->debugfs_work);
+	if (hisi_sas_debugfs_enable && hisi_hba->debugfs_itct[0].itct) {
+		down(&hisi_hba->sem);
+		hisi_hba->hw->debugfs_snapshot_regs(hisi_hba);
+		up(&hisi_hba->sem);
+	}
 
 	if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 		pr_err("Internal abort: timeout %016llx\n",

drivers/scsi/hisi_sas/hisi_sas_v3_hw.c

@@ -558,7 +558,6 @@ static int experimental_iopoll_q_cnt;
 module_param(experimental_iopoll_q_cnt, int, 0444);
 MODULE_PARM_DESC(experimental_iopoll_q_cnt, "number of queues to be used as poll mode, def=0");
 
-static void debugfs_work_handler_v3_hw(struct work_struct *work);
 static void debugfs_snapshot_regs_v3_hw(struct hisi_hba *hisi_hba);
 
 static u32 hisi_sas_read32(struct hisi_hba *hisi_hba, u32 off)
@@ -3388,7 +3387,6 @@ hisi_sas_shost_alloc_pci(struct pci_dev *pdev)
 	hisi_hba = shost_priv(shost);
 
 	INIT_WORK(&hisi_hba->rst_work, hisi_sas_rst_work_handler);
-	INIT_WORK(&hisi_hba->debugfs_work, debugfs_work_handler_v3_hw);
 	hisi_hba->hw = &hisi_sas_v3_hw;
 	hisi_hba->pci_dev = pdev;
 	hisi_hba->dev = dev;
@@ -3910,7 +3908,9 @@ static ssize_t debugfs_trigger_dump_v3_hw_write(struct file *file,
 	if (buf[0] != '1')
 		return -EFAULT;
 
-	queue_work(hisi_hba->wq, &hisi_hba->debugfs_work);
+	down(&hisi_hba->sem);
+	debugfs_snapshot_regs_v3_hw(hisi_hba);
+	up(&hisi_hba->sem);
 
 	return count;
 }
@@ -4661,14 +4661,6 @@ static void debugfs_fifo_init_v3_hw(struct hisi_hba *hisi_hba)
 	}
 }
 
-static void debugfs_work_handler_v3_hw(struct work_struct *work)
-{
-	struct hisi_hba *hisi_hba =
-		container_of(work, struct hisi_hba, debugfs_work);
-
-	debugfs_snapshot_regs_v3_hw(hisi_hba);
-}
-
 static void debugfs_release_v3_hw(struct hisi_hba *hisi_hba, int dump_index)
 {
 	struct device *dev = hisi_hba->dev;