Re: [PATCH v2 0/2] scsi: support spinup notification for SAS SSP devices in Active_Wait/Idle_Wait state

[yangxingui <yangxingui@huawei.com>]

Kindly ping for review...

On 2026/7/3 10:28, Xingui Yang wrote:
> When a SAS HDD connected via SSP (Serial Attached SCSI Protocol) is powered
> up with the RNOT (Ready Not Optimized) bit set, the device enters the
> Active_Wait or Idle_Wait power state per the SAS protocol specification. In
> this state, the device does not respond to standard SCSI START_STOP spinup
> commands and instead returns NOT_READY with ASC/ASCQ = 0x04/0x11 ("Logical
> unit not ready, notify (enable spinup) required").
> 
> Without handling this condition, the SCSI mid-layer will indefinitely retry
> the command with ACTION_DELAYED_RETRY, resulting in the disk never spinning
> up and becoming unusable. A typical manifestation is:
> 
>    sd 4:0:9:0: [sde] Spinning up disk...
>    ...not responding...
>    sd 4:0:9:0: [sde] Sense Key : Not Ready
>    sd 4:0:9:0: [sde] Add. Sense: Logical unit not ready, notify (enable spinup) required
> 
> To resolve this, the SAS controller needs to send a NOTIFY(ENABLE SPINUP)
> primitive to the target phy, which transitions the device out of the waiting
> state and allows normal spinup to proceed.
> 
> This patch series addresses the issue:
> 
> Adds a new optional spinup_notify callback to struct scsi_host_template
> in the SCSI mid-layer. When ASC/ASCQ = 0x04/0x11 is detected in
> scsi_io_completion_action(), the callback is invoked before the mid-layer
> falls through to ACTION_DELAYED_RETRY, giving the LLDD an opportunity to
> perform controller-specific spinup notification.
> 
> Changes in v2 (addressing Sashiko AI review on v1):
> - Add softirq context documentation to spinup_notify in scsi_host.h
> - Defer sl_notify_ssp() to ordered workqueue, fixing msleep-in-
>    atomic bug, preventing RMW races on SL_CONTROL, and deduplicating
>    concurrent callbacks via queue_work()
> 
> Xingui Yang (2):
>    scsi: scsi_lib: add spinup_notify callback for ASC/ASCQ=0x04/0x11
>    scsi: hisi_sas: add spinup_notify callback to handle
>      Active_Wait/Idle_Wait SSP devices
> 
>   drivers/scsi/hisi_sas/hisi_sas.h       |  2 ++
>   drivers/scsi/hisi_sas/hisi_sas_main.c  | 34 ++++++++++++++++++++++++++
>   drivers/scsi/hisi_sas/hisi_sas_v1_hw.c |  1 +
>   drivers/scsi/hisi_sas/hisi_sas_v2_hw.c |  1 +
>   drivers/scsi/hisi_sas/hisi_sas_v3_hw.c |  1 +
>   drivers/scsi/scsi_lib.c                |  4 +++
>   include/scsi/scsi_host.h               | 12 +++++++++
>   7 files changed, 55 insertions(+)
> 


Thanks,
Xingui