| Message ID | 20190826223317.28509-9-robh@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | panfrost: Locking and runtime PM fixes | expand |
On 26/08/2019 23:33, Rob Herring wrote: > With the introduction of the as_lock to serialize address space registers, > the hwaccess_lock is only used within the job code and is not protecting > anything. panfrost_job_hw_submit() only accesses registers for 1 job slot > and it's already serialized by drm_sched. > > Fixes: 7282f7645d06 ("drm/panfrost: Implement per FD address spaces") > Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com> > Cc: Steven Price <steven.price@arm.com> > Cc: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> > Cc: David Airlie <airlied@linux.ie> > Cc: Daniel Vetter <daniel@ffwll.ch> > Signed-off-by: Rob Herring <robh@kernel.org> Reviewed-by: Steven Price <steven.price@arm.com> Steve > --- > v3: > - New patch > > drivers/gpu/drm/panfrost/panfrost_device.c | 1 - > drivers/gpu/drm/panfrost/panfrost_device.h | 2 -- > drivers/gpu/drm/panfrost/panfrost_job.c | 4 ---- > 3 files changed, 7 deletions(-) > > diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c > index 73805210834e..46b0b02e4289 100644 > --- a/drivers/gpu/drm/panfrost/panfrost_device.c > +++ b/drivers/gpu/drm/panfrost/panfrost_device.c > @@ -124,7 +124,6 @@ int panfrost_device_init(struct panfrost_device *pfdev) > INIT_LIST_HEAD(&pfdev->scheduled_jobs); > INIT_LIST_HEAD(&pfdev->as_lru_list); > > - spin_lock_init(&pfdev->hwaccess_lock); > spin_lock_init(&pfdev->as_lock); > > err = panfrost_clk_init(pfdev); > diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h > index b7fa08ed3a23..9c39b9794811 100644 > --- a/drivers/gpu/drm/panfrost/panfrost_device.h > +++ b/drivers/gpu/drm/panfrost/panfrost_device.h > @@ -63,8 +63,6 @@ struct panfrost_device { > struct drm_device *ddev; > struct platform_device *pdev; > > - spinlock_t hwaccess_lock; > - > void __iomem *iomem; > struct clk *clock; > struct clk *bus_clock; > diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c > index 18bcc9bac6d2..a58551668d9a 100644 > --- a/drivers/gpu/drm/panfrost/panfrost_job.c > +++ b/drivers/gpu/drm/panfrost/panfrost_job.c > @@ -141,7 +141,6 @@ static void panfrost_job_write_affinity(struct panfrost_device *pfdev, > static void panfrost_job_hw_submit(struct panfrost_job *job, int js) > { > struct panfrost_device *pfdev = job->pfdev; > - unsigned long flags; > u32 cfg; > u64 jc_head = job->jc; > int ret; > @@ -158,7 +157,6 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js) > cfg = panfrost_mmu_as_get(pfdev, &job->file_priv->mmu); > > panfrost_devfreq_record_transition(pfdev, js); > - spin_lock_irqsave(&pfdev->hwaccess_lock, flags); > > job_write(pfdev, JS_HEAD_NEXT_LO(js), jc_head & 0xFFFFFFFF); > job_write(pfdev, JS_HEAD_NEXT_HI(js), jc_head >> 32); > @@ -187,8 +185,6 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js) > job, js, jc_head); > > job_write(pfdev, JS_COMMAND_NEXT(js), JS_COMMAND_START); > - > - spin_unlock_irqrestore(&pfdev->hwaccess_lock, flags); > } > > static void panfrost_acquire_object_fences(struct drm_gem_object **bos, > -- > 2.20.1 > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel >
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c index 73805210834e..46b0b02e4289 100644 --- a/drivers/gpu/drm/panfrost/panfrost_device.c +++ b/drivers/gpu/drm/panfrost/panfrost_device.c @@ -124,7 +124,6 @@ int panfrost_device_init(struct panfrost_device *pfdev) INIT_LIST_HEAD(&pfdev->scheduled_jobs); INIT_LIST_HEAD(&pfdev->as_lru_list); - spin_lock_init(&pfdev->hwaccess_lock); spin_lock_init(&pfdev->as_lock); err = panfrost_clk_init(pfdev); diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h index b7fa08ed3a23..9c39b9794811 100644 --- a/drivers/gpu/drm/panfrost/panfrost_device.h +++ b/drivers/gpu/drm/panfrost/panfrost_device.h @@ -63,8 +63,6 @@ struct panfrost_device { struct drm_device *ddev; struct platform_device *pdev; - spinlock_t hwaccess_lock; - void __iomem *iomem; struct clk *clock; struct clk *bus_clock; diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c index 18bcc9bac6d2..a58551668d9a 100644 --- a/drivers/gpu/drm/panfrost/panfrost_job.c +++ b/drivers/gpu/drm/panfrost/panfrost_job.c @@ -141,7 +141,6 @@ static void panfrost_job_write_affinity(struct panfrost_device *pfdev, static void panfrost_job_hw_submit(struct panfrost_job *job, int js) { struct panfrost_device *pfdev = job->pfdev; - unsigned long flags; u32 cfg; u64 jc_head = job->jc; int ret; @@ -158,7 +157,6 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js) cfg = panfrost_mmu_as_get(pfdev, &job->file_priv->mmu); panfrost_devfreq_record_transition(pfdev, js); - spin_lock_irqsave(&pfdev->hwaccess_lock, flags); job_write(pfdev, JS_HEAD_NEXT_LO(js), jc_head & 0xFFFFFFFF); job_write(pfdev, JS_HEAD_NEXT_HI(js), jc_head >> 32); @@ -187,8 +185,6 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js) job, js, jc_head); job_write(pfdev, JS_COMMAND_NEXT(js), JS_COMMAND_START); - - spin_unlock_irqrestore(&pfdev->hwaccess_lock, flags); } static void panfrost_acquire_object_fences(struct drm_gem_object **bos,
With the introduction of the as_lock to serialize address space registers, the hwaccess_lock is only used within the job code and is not protecting anything. panfrost_job_hw_submit() only accesses registers for 1 job slot and it's already serialized by drm_sched. Fixes: 7282f7645d06 ("drm/panfrost: Implement per FD address spaces") Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com> Cc: Steven Price <steven.price@arm.com> Cc: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Cc: David Airlie <airlied@linux.ie> Cc: Daniel Vetter <daniel@ffwll.ch> Signed-off-by: Rob Herring <robh@kernel.org> --- v3: - New patch drivers/gpu/drm/panfrost/panfrost_device.c | 1 - drivers/gpu/drm/panfrost/panfrost_device.h | 2 -- drivers/gpu/drm/panfrost/panfrost_job.c | 4 ---- 3 files changed, 7 deletions(-) -- 2.20.1