From: Bart Van Assche <bvanassche@acm.org>
To: Martin Kepplinger <martin.kepplinger@puri.sm>,
jejb@linux.ibm.com, martin.petersen@oracle.com,
Alan Stern <stern@rowland.harvard.edu>
Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@puri.sm
Subject: Re: [PATCH] scsi: sd: add runtime pm to open / release
Date: Fri, 26 Jun 2020 08:07:51 -0700 [thread overview]
Message-ID: <1379e21d-c51a-3710-e185-c2d7a9681fb7@acm.org> (raw)
In-Reply-To: <eccacce9-393c-ca5d-e3b3-09961340e0db@puri.sm>
On 2020-06-25 01:16, Martin Kepplinger wrote:
> here's roughly what happens when enabling runtime PM in sysfs (again,
> because sd_probe() calls autopm_put() and thus allows it:
>
> [ 27.384446] sd 0:0:0:0: scsi_runtime_suspend
> [ 27.432282] blk_pre_runtime_suspend
> [ 27.435783] sd_suspend_common
> [ 27.438782] blk_post_runtime_suspend
> [ 27.442427] scsi target0:0:0: scsi_runtime_suspend
> [ 27.447303] scsi host0: scsi_runtime_suspend
>
> then I "mount /dev/sda1 /mnt" and none of the resume() functions get
> called. To me it looks like the sd driver should initiate resuming, and
> that's not implemented.
>
> what am I doing wrong or overlooking? how exactly does (or should) the
> block layer initiate resume here?
As far as I know runtime power management support in the sd driver is working
fine and is being used intensively by the UFS driver. The following commit was
submitted to fix a bug encountered by an UFS developer: 05d18ae1cc8a ("scsi:
pm: Balance pm_only counter of request queue during system resume") # v5.7.
I'm not sure which bug is causing trouble on your setup but I think it's likely
that the root cause is somewhere else than in the block layer, the SCSI core
or the SCSI sd driver.
Bart.
next prev parent reply other threads:[~2020-06-26 15:07 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-23 11:10 [PATCH] scsi: sd: add runtime pm to open / release Martin Kepplinger
2020-06-24 13:33 ` Bart Van Assche
2020-06-25 8:16 ` Martin Kepplinger
2020-06-25 14:52 ` Alan Stern
2020-06-26 3:53 ` Bart Van Assche
2020-06-26 15:07 ` Bart Van Assche [this message]
2020-06-26 15:44 ` Alan Stern
2020-06-28 2:37 ` Bart Van Assche
2020-06-28 13:10 ` Alan Stern
2020-06-29 9:42 ` Martin Kepplinger
2020-06-29 16:15 ` Alan Stern
2020-06-29 16:56 ` Bart Van Assche
2020-06-29 17:40 ` Alan Stern
2020-06-30 3:33 ` Martin Kepplinger
2020-06-30 13:38 ` Alan Stern
2020-06-30 15:59 ` Bart Van Assche
2020-06-30 18:02 ` Alan Stern
2020-06-30 19:23 ` Bart Van Assche
2020-06-30 19:38 ` Alan Stern
2020-06-30 23:31 ` Bart Van Assche
2020-07-01 0:49 ` Alan Stern
2020-07-06 16:41 ` Alan Stern
2020-07-28 7:02 ` Martin Kepplinger
2020-07-28 20:02 ` Alan Stern
2020-07-29 14:12 ` Martin Kepplinger
2020-07-29 14:32 ` Alan Stern
2020-07-29 14:44 ` Martin K. Petersen
2020-07-29 14:56 ` Alan Stern
2020-07-29 14:46 ` James Bottomley
2020-07-29 14:53 ` James Bottomley
2020-07-29 15:40 ` Martin Kepplinger
2020-07-29 15:44 ` James Bottomley
2020-07-29 16:43 ` Martin Kepplinger
2020-07-29 18:25 ` Alan Stern
2020-07-29 18:29 ` James Bottomley
2020-07-30 8:52 ` Martin Kepplinger
2020-07-30 8:54 ` Martin Kepplinger
2020-07-30 15:10 ` Alan Stern
2020-08-04 9:39 ` Martin Kepplinger
2020-08-07 9:51 ` Martin Kepplinger
2020-08-07 14:30 ` Alan Stern
2020-08-08 6:59 ` Martin Kepplinger
2020-08-08 15:05 ` Alan Stern
2020-08-09 9:20 ` Martin Kepplinger
2020-08-09 15:26 ` Alan Stern
2020-08-10 12:03 ` Martin Kepplinger
2020-08-10 14:13 ` Alan Stern
2020-08-11 7:55 ` Martin Kepplinger
2020-08-11 13:48 ` Alan Stern
2020-08-23 14:57 ` [PATCH] block: Fix bug in runtime-resume handling Alan Stern
2020-08-24 17:48 ` Bart Van Assche
2020-08-24 20:13 ` Alan Stern
2020-08-26 7:48 ` Martin Kepplinger
2020-08-27 17:42 ` Martin Kepplinger
2020-08-27 20:29 ` Alan Stern
2020-08-29 7:24 ` Martin Kepplinger
2020-08-29 15:26 ` Alan Stern
2020-08-29 16:33 ` Martin Kepplinger
2020-08-29 18:56 ` Alan Stern
2020-08-30 0:38 ` Bart Van Assche
2020-08-30 1:06 ` Alan Stern
2020-07-29 15:40 ` [PATCH] scsi: sd: add runtime pm to open / release Alan Stern
2020-07-29 15:49 ` James Bottomley
2020-07-29 16:17 ` Alan Stern
2020-07-29 15:52 ` Martin Kepplinger
2020-07-29 18:10 ` Douglas Gilbert
2020-07-30 8:05 ` Martin Kepplinger
2020-07-30 15:14 ` Alan Stern
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