RE: [PATCH] video: hyperv_fb: Fix hibernation for the deferred IO feature
> -Original Message-
> From: Dexuan Cui
> Sent: Wednesday, November 20, 2019 3:14 PM
> To: KY Srinivasan ; Haiyang Zhang
> ; Stephen Hemminger ;
> sas...@kernel.org; b.zolnier...@samsung.com; linux-hyp...@vger.kernel.org;
> dri-devel@lists.freedesktop.org; linux-fb...@vger.kernel.org; linux-
> ker...@vger.kernel.org; Michael Kelley ; Sasha Levin
>
> Cc: Wei Hu ; Dexuan Cui
> Subject: [PATCH] video: hyperv_fb: Fix hibernation for the deferred IO feature
>
> fb_deferred_io_work() can access the vmbus ringbuffer by calling
> fbdefio->deferred_io() -> synthvid_deferred_io() -> synthvid_update().
>
> Because the vmbus ringbuffer is inaccessible between hvfb_suspend() and
> hvfb_resume(), we must cancel info->deferred_work before calling
> vmbus_close() and then reschedule it after we reopen the channel in
> hvfb_resume().
>
> Fixes: a4ddb11d297e ("video: hyperv: hyperv_fb: Support deferred IO for
> Hyper-V frame buffer driver")
> Fixes: 824946a8b6fb ("video: hyperv_fb: Add the support of hibernation")
> Signed-off-by: Dexuan Cui
> ---
>
> This patch fixes the 2 aforementioned patches on Sasha Levin's Hyper-V tree's
> hyperv-next branch:
> https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kern
> el.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Fhyperv%2Flinux.git%2Flog
> %2F%3Fh%3Dhyperv-
> nextdata=02%7C01%7Cweh%40microsoft.com%7C451143ff78f04401d9
> 6f08d76d893a84%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637
> 098308493217121sdata=P2fo%2F1TJUMIj5FtJCOp2QwDrghhVfPSCEJ4f1
> vkOXvI%3Dreserved=0
>
> The 2 aforementioned patches have not appeared in the mainline yet, so please
> pick up this patch onto he same hyperv-next branch.
>
> drivers/video/fbdev/hyperv_fb.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
> index 4cd27e5172a1..08bc0dfb5ce7 100644
> --- a/drivers/video/fbdev/hyperv_fb.c
> +++ b/drivers/video/fbdev/hyperv_fb.c
> @@ -1194,6 +1194,7 @@ static int hvfb_suspend(struct hv_device *hdev)
> fb_set_suspend(info, 1);
>
> cancel_delayed_work_sync(>dwork);
> + cancel_delayed_work_sync(>deferred_work);
>
> par->update_saved = par->update;
> par->update = false;
> @@ -1227,6 +1228,7 @@ static int hvfb_resume(struct hv_device *hdev)
> par->fb_ready = true;
> par->update = par->update_saved;
>
> + schedule_delayed_work(>deferred_work, info->fbdefio->delay);
> schedule_delayed_work(>dwork, HVFB_UPDATE_DELAY);
>
> /* 0 means do resume */
> --
> 2.19.1
Signed-off-by: Wei Hu
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RE: [PATCH] video: hyperv_fb: Fix hibernation for the deferred IO feature
> -Original Message-
> From: Wei Hu
> Sent: 2019年11月21日 10:47
> To: Dexuan Cui ; KY Srinivasan ;
> Haiyang Zhang ; Stephen Hemminger
> ; sas...@kernel.org; b.zolnier...@samsung.com;
> linux-hyp...@vger.kernel.org; dri-devel@lists.freedesktop.org; linux-
> fb...@vger.kernel.org; linux-ker...@vger.kernel.org; Michael Kelley
> ; Sasha Levin
> Subject: RE: [PATCH] video: hyperv_fb: Fix hibernation for the deferred IO
> feature
>
> > -Original Message-
> > From: Dexuan Cui
> > Sent: Wednesday, November 20, 2019 3:14 PM
> > To: KY Srinivasan ; Haiyang Zhang
> > ; Stephen Hemminger
> ;
> > sas...@kernel.org; b.zolnier...@samsung.com; linux-hyp...@vger.kernel.org;
> > dri-devel@lists.freedesktop.org; linux-fb...@vger.kernel.org; linux-
> > ker...@vger.kernel.org; Michael Kelley ; Sasha
> Levin
> >
> > Cc: Wei Hu ; Dexuan Cui
> > Subject: [PATCH] video: hyperv_fb: Fix hibernation for the deferred IO
> > feature
> >
> > fb_deferred_io_work() can access the vmbus ringbuffer by calling
> > fbdefio->deferred_io() -> synthvid_deferred_io() -> synthvid_update().
> >
> > Because the vmbus ringbuffer is inaccessible between hvfb_suspend() and
> > hvfb_resume(), we must cancel info->deferred_work before calling
> > vmbus_close() and then reschedule it after we reopen the channel in
> > hvfb_resume().
> >
> > Fixes: a4ddb11d297e ("video: hyperv: hyperv_fb: Support deferred IO for
> > Hyper-V frame buffer driver")
> > Fixes: 824946a8b6fb ("video: hyperv_fb: Add the support of hibernation")
> > Signed-off-by: Dexuan Cui
> > ---
> >
> > This patch fixes the 2 aforementioned patches on Sasha Levin's Hyper-V
> > tree's
> > hyperv-next branch:
> >
> https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kern
> > el.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Fhyperv%2Flinux.git%2Flog
> > %2F%3Fh%3Dhyperv-
> >
> nextdata=02%7C01%7Cweh%40microsoft.com%7C451143ff78f04401d9
> > 6f08d76d893a84%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637
> >
> 098308493217121sdata=P2fo%2F1TJUMIj5FtJCOp2QwDrghhVfPSCEJ4f1
> > vkOXvI%3Dreserved=0
> >
> > The 2 aforementioned patches have not appeared in the mainline yet, so
> please
> > pick up this patch onto he same hyperv-next branch.
> >
> > drivers/video/fbdev/hyperv_fb.c | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/video/fbdev/hyperv_fb.c
> > b/drivers/video/fbdev/hyperv_fb.c
> > index 4cd27e5172a1..08bc0dfb5ce7 100644
> > --- a/drivers/video/fbdev/hyperv_fb.c
> > +++ b/drivers/video/fbdev/hyperv_fb.c
> > @@ -1194,6 +1194,7 @@ static int hvfb_suspend(struct hv_device *hdev)
> > fb_set_suspend(info, 1);
> >
> > cancel_delayed_work_sync(>dwork);
> > + cancel_delayed_work_sync(>deferred_work);
> >
> > par->update_saved = par->update;
> > par->update = false;
> > @@ -1227,6 +1228,7 @@ static int hvfb_resume(struct hv_device *hdev)
> > par->fb_ready = true;
> > par->update = par->update_saved;
> >
> > + schedule_delayed_work(>deferred_work, info->fbdefio->delay);
> > schedule_delayed_work(>dwork, HVFB_UPDATE_DELAY);
> >
> > /* 0 means do resume */
> > --
> > 2.19.1
>
> Signed-off-by: Wei Hu
Sorry, please disregard the Signed-off-by line I added above. It was my mistake.
should be:
Reviewed-by: Wei Hu
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[PATCH] video: hyperv_fb: Fix hibernation for the deferred IO feature
fb_deferred_io_work() can access the vmbus ringbuffer by calling
fbdefio->deferred_io() -> synthvid_deferred_io() -> synthvid_update().
Because the vmbus ringbuffer is inaccessible between hvfb_suspend()
and hvfb_resume(), we must cancel info->deferred_work before calling
vmbus_close() and then reschedule it after we reopen the channel
in hvfb_resume().
Fixes: a4ddb11d297e ("video: hyperv: hyperv_fb: Support deferred IO for Hyper-V
frame buffer driver")
Fixes: 824946a8b6fb ("video: hyperv_fb: Add the support of hibernation")
Signed-off-by: Dexuan Cui
---
This patch fixes the 2 aforementioned patches on Sasha Levin's Hyper-V tree's
hyperv-next branch:
https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git/log/?h=hyperv-next
The 2 aforementioned patches have not appeared in the mainline yet, so
please pick up this patch onto he same hyperv-next branch.
drivers/video/fbdev/hyperv_fb.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
index 4cd27e5172a1..08bc0dfb5ce7 100644
--- a/drivers/video/fbdev/hyperv_fb.c
+++ b/drivers/video/fbdev/hyperv_fb.c
@@ -1194,6 +1194,7 @@ static int hvfb_suspend(struct hv_device *hdev)
fb_set_suspend(info, 1);
cancel_delayed_work_sync(>dwork);
+ cancel_delayed_work_sync(>deferred_work);
par->update_saved = par->update;
par->update = false;
@@ -1227,6 +1228,7 @@ static int hvfb_resume(struct hv_device *hdev)
par->fb_ready = true;
par->update = par->update_saved;
+ schedule_delayed_work(>deferred_work, info->fbdefio->delay);
schedule_delayed_work(>dwork, HVFB_UPDATE_DELAY);
/* 0 means do resume */
--
2.19.1
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