[PATCH 1/2] drm: rename null fence to stub fence in syncobj

[Christian König]

Am 22.08.2018 um 11:10 schrieb zhoucm1:
>
>
>
> On 2018年08月22日 17:05, Christian König wrote:
>> Am 22.08.2018 um 11:02 schrieb zhoucm1:
>>>
>>>
>>> On 2018年08月22日 16:52, Christian König wrote:
>>>> Am 22.08.2018 um 10:38 schrieb Chunming Zhou:
>>>>> stub fence will be used by timeline syncobj as well.
>>>>>
>>>>> Change-Id: Ia4252f03c07a8105491d2791dc7c8c6976682285
>>>>> Signed-off-by: Chunming Zhou <david1.zhou at amd.com>
>>>>> Cc: Jason Ekstrand <jason at jlekstrand.net>
>>>>> ---
>>>>>   drivers/gpu/drm/drm_syncobj.c | 28 ++--------------------------
>>>>>   include/drm/drm_syncobj.h     | 24 ++++++++++++++++++++++++
>>>>>   2 files changed, 26 insertions(+), 26 deletions(-)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/drm_syncobj.c 
>>>>> b/drivers/gpu/drm/drm_syncobj.c
>>>>> index d4f4ce484529..70af32d0def1 100644
>>>>> --- a/drivers/gpu/drm/drm_syncobj.c
>>>>> +++ b/drivers/gpu/drm/drm_syncobj.c
>>>>> @@ -187,39 +187,15 @@ void drm_syncobj_replace_fence(struct 
>>>>> drm_syncobj *syncobj,
>>>>>   }
>>>>>   EXPORT_SYMBOL(drm_syncobj_replace_fence);
>>>>>   -struct drm_syncobj_null_fence {
>>>>> -    struct dma_fence base;
>>>>> -    spinlock_t lock;
>>>>> -};
>>>>> -
>>>>> -static const char *drm_syncobj_null_fence_get_name(struct 
>>>>> dma_fence *fence)
>>>>> -{
>>>>> -        return "syncobjnull";
>>>>> -}
>>>>> -
>>>>> -static bool drm_syncobj_null_fence_enable_signaling(struct 
>>>>> dma_fence *fence)
>>>>> -{
>>>>> -    dma_fence_enable_sw_signaling(fence);
>>>>> -    return !dma_fence_is_signaled(fence);
>>>>> -}
>>>>> -
>>>>> -static const struct dma_fence_ops drm_syncobj_null_fence_ops = {
>>>>> -    .get_driver_name = drm_syncobj_null_fence_get_name,
>>>>> -    .get_timeline_name = drm_syncobj_null_fence_get_name,
>>>>> -    .enable_signaling = drm_syncobj_null_fence_enable_signaling,
>>>>> -    .wait = dma_fence_default_wait,
>>>>> -    .release = NULL,
>>>>> -};
>>>>> -
>>>>>   static int drm_syncobj_assign_null_handle(struct drm_syncobj 
>>>>> *syncobj)
>>>>>   {
>>>>> -    struct drm_syncobj_null_fence *fence;
>>>>> +    struct drm_syncobj_stub_fence *fence;
>>>>>       fence = kzalloc(sizeof(*fence), GFP_KERNEL);
>>>>>       if (fence == NULL)
>>>>>           return -ENOMEM;
>>>>>         spin_lock_init(&fence->lock);
>>>>> -    dma_fence_init(&fence->base, &drm_syncobj_null_fence_ops,
>>>>> +    dma_fence_init(&fence->base, &drm_syncobj_stub_fence_ops,
>>>>>                  &fence->lock, 0, 0);
>>>>>       dma_fence_signal(&fence->base);
>>>>>   diff --git a/include/drm/drm_syncobj.h b/include/drm/drm_syncobj.h
>>>>> index 3980602472c0..b04c492ddbb5 100644
>>>>> --- a/include/drm/drm_syncobj.h
>>>>> +++ b/include/drm/drm_syncobj.h
>>>>> @@ -30,6 +30,30 @@
>>>>>     struct drm_syncobj_cb;
>>>>>   +struct drm_syncobj_stub_fence {
>>>>> +    struct dma_fence base;
>>>>> +    spinlock_t lock;
>>>>> +};
>>>>> +
>>>>> +const char *drm_syncobj_stub_fence_get_name(struct dma_fence *fence)
>>>>> +{
>>>>> +        return "syncobjstub";
>>>>> +}
>>>>> +
>>>>> +bool drm_syncobj_stub_fence_enable_signaling(struct dma_fence 
>>>>> *fence)
>>>>> +{
>>>>> +    dma_fence_enable_sw_signaling(fence);
>>>>
>>>> Copy&pasted from the old implementation, but that is certainly 
>>>> totally nonsense.
>>>>
>>>> dma_fence_enable_sw_signaling() is the function who is calling this 
>>>> callback.
>>> indeed, will fix.
>>>>
>>>>> +    return !dma_fence_is_signaled(fence);
>>>>> +}
>>>>> +
>>>>> +const struct dma_fence_ops drm_syncobj_stub_fence_ops = {
>>>>> +    .get_driver_name = drm_syncobj_stub_fence_get_name,
>>>>> +    .get_timeline_name = drm_syncobj_stub_fence_get_name,
>>>>> +    .enable_signaling = drm_syncobj_stub_fence_enable_signaling,
>>>>> +    .wait = dma_fence_default_wait,
>>>>
>>>> The .wait callback should be dropped.
>>> why?
>>>
>>> fence->ops->wait(fence, intr, timeout) is called by 
>>> dma_fence_wait(). If dropped, how does dma_fence_wait() work?
>>
>> You are working on an older code base, fence->ops->wait is optional 
>> by now.
> Sorry, I still don't get it. My code is synced today from 
> amd-staging-drm-next, and it's 4.18-rc1.

That is outdated, when working on common drm stuff you need to work on 
drm-next or drm-misc-next.

> I still see the dma_fence_wait_timeout is :
> signed long
> dma_fence_wait_timeout(struct dma_fence *fence, bool intr, signed long 
> timeout)
> {
>         signed long ret;
>
>         if (WARN_ON(timeout < 0))
>                 return -EINVAL;
>
>         trace_dma_fence_wait_start(fence);
>         ret = fence->ops->wait(fence, intr, timeout);
>         trace_dma_fence_wait_end(fence);
>         return ret;
> }
>
> .wait callback seems still a must have?

See drm-misc-next:

>         trace_dma_fence_wait_start(fence);
>         if (fence->ops->wait)
>                 ret = fence->ops->wait(fence, intr, timeout);
>         else
>                 ret = dma_fence_default_wait(fence, intr, timeout);
>         trace_dma_fence_wait_end(fence);

Regards,
Christian.

>
> Thanks,
> David Zhou
>
>
>>
>> Christian.
>>
>>>
>>> Thanks,
>>> David
>>>>
>>>> Apart from that looks good to me.
>>>>
>>>> Christian.
>>>>
>>>>> +    .release = NULL,
>>>>> +};
>>>>> +
>>>>>   /**
>>>>>    * struct drm_syncobj - sync object.
>>>>>    *
>>>>
>>>
>>> _______________________________________________
>>> amd-gfx mailing list
>>> amd-gfx at lists.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
>>
>
>
>
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