[PATCH v2 1/2] scsi: scsi_lib: add spinup_notify callback for ASC/ASCQ=0x04/0x11

[Xingui Yang <yangxingui@huawei.com>]

When a SCSI device returns NOT_READY with ASC/ASCQ = 0x04/0x11
("notify (enable spinup) required"), the device is in Active_Wait or
Idle_Wait power state and will not respond to standard START_STOP
spinup commands.

Add an optional spinup_notify callback to struct scsi_host_template.
When ASCQ=0x11 is detected in the mid-layer, invoke this callback
before ACTION_DELAYED_RETRY, allowing LLDDs to perform controller-
specific spinup notification.

Example log:
[Tue Jun 23 08:34:44 2026] sd 4:0:9:0: [sde] Spinning up disk...
[Tue Jun 23 08:36:22 2026] ...not responding...
[Tue Jun 23 08:36:24 2026] sd 4:0:9:0: [sde] Sense Key : Not Ready
[Tue Jun 23 08:36:24 2026] sd 4:0:9:0: [sde] Add. Sense: Logical unit
  not ready, notify (enable spinup) required

Signed-off-by: Xingui Yang <yangxingui@huawei.com>
---
 drivers/scsi/scsi_lib.c  |  4 ++++
 include/scsi/scsi_host.h | 12 ++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index b67f0dc79499..33c4339ca8c5 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -905,6 +905,10 @@ static void scsi_io_completion_action(struct scsi_cmnd *cmd, int result)
 				case 0x1a: /* start stop unit in progress */
 				case 0x1b: /* sanitize in progress */
 				case 0x1d: /* configuration in progress */
+					if (sshdr.ascq == 0x11 &&
+					    cmd->device->host->hostt->spinup_notify)
+						cmd->device->host->hostt->spinup_notify(
+							cmd->device);
 					action = ACTION_DELAYED_RETRY;
 					break;
 				case 0x0a: /* ALUA state transition */
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 7e2011830ba4..22bf2d3d9b36 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -374,6 +374,18 @@ struct scsi_host_template {
 #define SCSI_ADAPTER_RESET	1
 #define SCSI_FIRMWARE_RESET	2
 
+	/*
+	 * Optional callback invoked when a device returns NOT_READY with
+	 * ASC/ASCQ = 0x04/0x11 ("notify (enable spinup) required").
+	 * This allows LLDDs to perform controller-specific spinup
+	 * notification before the mid-layer retries.
+	 *
+	 * Context: Called from softirq (block layer completion) context.
+	 * Implementations must not sleep or schedule.
+	 *
+	 * Status: OPTIONAL
+	 */
+	void (*spinup_notify)(struct scsi_device *sdev);
 
 	/*
 	 * Name of proc directory
-- 
2.43.0