!1005 scsi: hisi_sas: A group of SAS-related bugfixes

Merge Pull Request from: @xia-bing1 
 
This series contain some fixes including:
  -Add slave_destroy interface for v3 hw
  -Try more retries of START_STOP when resuming scsi device
  -Block requests before take debugfs snapshot
  -Check usage count only when the runtime PM status is RPM_SUSPENDING 
 
Link:https://gitee.com/openeuler/kernel/pulls/1005 

Reviewed-by: Yihang Li <liyihang9@huawei.com> 
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com> 

drivers/scsi/hisi_sas/hisi_sas_v3_hw.c

@@ -2870,7 +2870,8 @@ static int slave_configure_v3_hw(struct scsi_device *sdev)
 		return 0;
 
 	if (!device_link_add(&sdev->sdev_gendev, dev,
-			     DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE)) {
+			     DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME |
+			     DL_FLAG_RPM_ACTIVE)) {
 		if (pm_runtime_enabled(dev)) {
 			dev_info(dev, "add device link failed, disable runtime PM for the host\n");
 			pm_runtime_disable(dev);
@@ -2880,6 +2881,15 @@ static int slave_configure_v3_hw(struct scsi_device *sdev)
 	return 0;
 }
 
+static void slave_destroy_v3_hw(struct scsi_device *sdev)
+{
+	struct Scsi_Host *shost = dev_to_shost(&sdev->sdev_gendev);
+	struct hisi_hba *hisi_hba = shost_priv(shost);
+	struct device *dev = hisi_hba->dev;
+
+	device_link_remove(&sdev->sdev_gendev, dev);
+}
+
 static struct device_attribute *host_attrs_v3_hw[] = {
 	&dev_attr_phy_event_threshold,
 	&dev_attr_intr_conv_v3_hw,
@@ -3064,21 +3074,24 @@ static const struct hisi_sas_debugfs_reg debugfs_ras_reg = {
 
 static void debugfs_snapshot_prepare_v3_hw(struct hisi_hba *hisi_hba)
 {
-	set_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags);
-
-	hisi_sas_write32(hisi_hba, DLVRY_QUEUE_ENABLE, 0);
+	struct Scsi_Host *shost = hisi_hba->shost;
 
+	scsi_block_requests(shost);
 	wait_cmds_complete_timeout_v3_hw(hisi_hba, 100, 5000);
-
+	set_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags);
 	hisi_sas_sync_irqs(hisi_hba);
+	hisi_sas_write32(hisi_hba, DLVRY_QUEUE_ENABLE, 0);
 }
 
 static void debugfs_snapshot_restore_v3_hw(struct hisi_hba *hisi_hba)
 {
+	struct Scsi_Host *shost = hisi_hba->shost;
+
 	hisi_sas_write32(hisi_hba, DLVRY_QUEUE_ENABLE,
 			 (u32)((1ULL << hisi_hba->queue_count) - 1));
 
 	clear_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags);
+	scsi_unblock_requests(shost);
 }
 
 static void read_iost_itct_cache_v3_hw(struct hisi_hba *hisi_hba,
@@ -3268,6 +3281,7 @@ static struct scsi_host_template sht_v3_hw = {
 	.eh_device_reset_handler = sas_eh_device_reset_handler,
 	.eh_target_reset_handler = sas_eh_target_reset_handler,
 	.slave_alloc		= hisi_sas_slave_alloc,
+	.slave_destroy		= slave_destroy_v3_hw,
 	.target_destroy		= sas_target_destroy,
 	.ioctl			= sas_ioctl,
 #ifdef CONFIG_COMPAT
@@ -5087,11 +5101,14 @@ static int _suspend_v3_hw(struct device *device)
 	flush_workqueue(hisi_hba->wq);
 	interrupt_disable_v3_hw(hisi_hba);
 
-	if (atomic_read(&device->power.usage_count)) {
+#ifdef CONFIG_PM
+	if ((device->power.runtime_status == RPM_SUSPENDING) &&
+	    atomic_read(&device->power.usage_count)) {
 		dev_err(dev, "PM suspend: host status cannot be suspended\n");
 		rc = -EBUSY;
 		goto err_out;
 	}
+#endif
 
 	rc = disable_host_v3_hw(hisi_hba);
 	if (rc) {
@@ -5110,7 +5127,9 @@ static int _suspend_v3_hw(struct device *device)
 
 err_out_recover_host:
 	enable_host_v3_hw(hisi_hba);
+#ifdef CONFIG_PM
 err_out:
+#endif
 	interrupt_enable_v3_hw(hisi_hba);
 	clear_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags);
 	clear_bit(HISI_SAS_RESET_BIT, &hisi_hba->flags);

drivers/scsi/sd.c

@@ -3663,6 +3663,7 @@ static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
 {
 	struct scsi_disk *sdkp = dev_get_drvdata(dev);
 	struct scsi_sense_hdr sshdr;
+	int retries;
 	int ret = 0;
 
 	if (!sdkp)	/* E.g.: runtime suspend following sd_remove() */
@@ -3693,9 +3694,15 @@ static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
 	if (sdkp->device->manage_start_stop) {
 		sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
 		/* an error is not worth aborting a system sleep */
-		ret = sd_start_stop_device(sdkp, 0);
-		if (ignore_stop_errors)
-			ret = 0;
+		for (retries = 3; retries > 0; --retries) {
+			ret = sd_start_stop_device(sdkp, 0);
+			if (!ret)
+				break;
+			if (ignore_stop_errors) {
+				ret = 0;
+				break;
+			}
+		}
 	}
 
 	return ret;
@@ -3714,6 +3721,7 @@ static int sd_suspend_runtime(struct device *dev)
 static int sd_resume(struct device *dev)
 {
 	struct scsi_disk *sdkp = dev_get_drvdata(dev);
+	int retries;
 	int ret;
 
 	if (!sdkp)	/* E.g.: runtime resume at the start of sd_probe() */
@@ -3723,9 +3731,13 @@ static int sd_resume(struct device *dev)
 		return 0;
 
 	sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
-	ret = sd_start_stop_device(sdkp, 1);
-	if (!ret)
-		opal_unlock_from_suspend(sdkp->opal_dev);
+	for (retries = 3; retries > 0; --retries) {
+		ret = sd_start_stop_device(sdkp, 1);
+		if (!ret) {
+			opal_unlock_from_suspend(sdkp->opal_dev);
+			break;
+		}
+	}
 	return ret;
 }