* [PATCH] drm/rockchip: Return -EBUSY if there's already a pending flip event v2 @ 2016-03-31 8:08 Tomeu Vizoso 2016-04-01 11:26 ` Mark yao 0 siblings, 1 reply; 4+ messages in thread From: Tomeu Vizoso @ 2016-03-31 8:08 UTC (permalink / raw) To: linux-kernel; +Cc: Tomeu Vizoso, dri-devel, linux-rockchip, linux-arm-kernel As per the docs, atomic_commit should return -EBUSY "if an asycnhronous updated is requested and there is an earlier updated pending". v2: Use the status of the workqueue instead of vop->event, and don't add a superfluous wait on the workqueue. Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com> --- drivers/gpu/drm/rockchip/rockchip_drm_fb.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c index 3b8f652698f8..285f8cd5afe1 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c @@ -282,6 +282,9 @@ int rockchip_drm_atomic_commit(struct drm_device *dev, struct rockchip_atomic_commit *commit = &private->commit; int ret; + if (async && work_busy(&commit->work)) + return -EBUSY; + ret = drm_atomic_helper_prepare_planes(dev, state); if (ret) return ret; -- 2.5.5 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel ^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] drm/rockchip: Return -EBUSY if there's already a pending flip event v2 2016-03-31 8:08 [PATCH] drm/rockchip: Return -EBUSY if there's already a pending flip event v2 Tomeu Vizoso @ 2016-04-01 11:26 ` Mark yao 2016-04-01 11:47 ` Tomeu Vizoso 0 siblings, 1 reply; 4+ messages in thread From: Mark yao @ 2016-04-01 11:26 UTC (permalink / raw) To: Tomeu Vizoso, linux-kernel; +Cc: linux-rockchip, dri-devel, linux-arm-kernel [-- Attachment #1: Type: text/html, Size: 2317 bytes --] [-- Attachment #2: Type: text/plain, Size: 160 bytes --] _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] drm/rockchip: Return -EBUSY if there's already a pending flip event v2 2016-04-01 11:26 ` Mark yao @ 2016-04-01 11:47 ` Tomeu Vizoso 2016-04-01 11:54 ` Mark yao 0 siblings, 1 reply; 4+ messages in thread From: Tomeu Vizoso @ 2016-04-01 11:47 UTC (permalink / raw) To: Mark yao, linux-kernel; +Cc: linux-rockchip, dri-devel, linux-arm-kernel On 04/01/2016 01:26 PM, Mark yao wrote: > On 2016年03月31日 16:08, Tomeu Vizoso wrote: >> As per the docs, atomic_commit should return -EBUSY "if an asycnhronous >> updated is requested and there is an earlier updated pending". >> >> v2: Use the status of the workqueue instead of vop->event, and don't add >> a superfluous wait on the workqueue. >> >> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com> >> --- >> drivers/gpu/drm/rockchip/rockchip_drm_fb.c | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c >> index 3b8f652698f8..285f8cd5afe1 100644 >> --- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c >> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c >> @@ -282,6 +282,9 @@ int rockchip_drm_atomic_commit(struct drm_device *dev, >> struct rockchip_atomic_commit *commit = &private->commit; >> int ret; >> >> + if (async && work_busy(&commit->work)) >> + return -EBUSY; >> + > > Sorry for reply late. > > There is a comment on work_busy function describe : > > "the test result is unreliable and only useful as advisory hints or > for debugging." > > I don't know if it's suitable to use it here, does some guys know it? I'm not sure, but if the reason is the caveat explained in find_worker_executing_work(), then it's probably safe (and would explain how the function is used in other parts in the kernel). > And then, the "flush_work(&commit->work);" is no needed if return -EBUSY > here. > you can remove it at this patch. We still need to wait if it's being called in sync mode. Regards, Tomeu >> ret = drm_atomic_helper_prepare_planes(dev, state); >> if (ret) >> return ret; > > > > -- > Ｍark Yao > _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] drm/rockchip: Return -EBUSY if there's already a pending flip event v2 2016-04-01 11:47 ` Tomeu Vizoso @ 2016-04-01 11:54 ` Mark yao 0 siblings, 0 replies; 4+ messages in thread From: Mark yao @ 2016-04-01 11:54 UTC (permalink / raw) To: Tomeu Vizoso, linux-kernel; +Cc: linux-rockchip, dri-devel, linux-arm-kernel On 2016年04月01日 19:47, Tomeu Vizoso wrote: > On 04/01/2016 01:26 PM, Mark yao wrote: >> On 2016年03月31日 16:08, Tomeu Vizoso wrote: >>> As per the docs, atomic_commit should return -EBUSY "if an asycnhronous >>> updated is requested and there is an earlier updated pending". >>> >>> v2: Use the status of the workqueue instead of vop->event, and don't add >>> a superfluous wait on the workqueue. >>> >>> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com> >>> --- >>> drivers/gpu/drm/rockchip/rockchip_drm_fb.c | 3 +++ >>> 1 file changed, 3 insertions(+) >>> >>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c >>> index 3b8f652698f8..285f8cd5afe1 100644 >>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c >>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c >>> @@ -282,6 +282,9 @@ int rockchip_drm_atomic_commit(struct drm_device *dev, >>> struct rockchip_atomic_commit *commit = &private->commit; >>> int ret; >>> >>> + if (async && work_busy(&commit->work)) >>> + return -EBUSY; >>> + >> Sorry for reply late. >> >> There is a comment on work_busy function describe : >> >> "the test result is unreliable and only useful as advisory hints or >> for debugging." >> >> I don't know if it's suitable to use it here, does some guys know it? > I'm not sure, but if the reason is the caveat explained in > find_worker_executing_work(), then it's probably safe (and would explain > how the function is used in other parts in the kernel). > >> And then, the "flush_work(&commit->work);" is no needed if return -EBUSY >> here. >> you can remove it at this patch. > We still need to wait if it's being called in sync mode. > > Regards, > > Tomeu Hi TomeuＨｉ on sync mode, flush is no needed, because that: 1, there is mutex_lock/mutex_unlock on this context, So only single process run into commit work; 2, sync mode will block on: rockchip_atomic_commit_complete-->rockchip_atomic_wait_for_complete, Thanks. > >>> ret = drm_atomic_helper_prepare_planes(dev, state); >>> if (ret) >>> return ret; >> >> >> -- >> Ｍark Yao >> > > > -- Ｍark Yao _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2016-04-01 11:54 UTC | newest] Thread overview: 4+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2016-03-31 8:08 [PATCH] drm/rockchip: Return -EBUSY if there's already a pending flip event v2 Tomeu Vizoso 2016-04-01 11:26 ` Mark yao 2016-04-01 11:47 ` Tomeu Vizoso 2016-04-01 11:54 ` Mark yao
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