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dma-fence: Make ->wait callback optional 

Almost everyone uses dma_fence_default_wait.

v2: Also remove the BUG_ON(!ops->wait) (Chris).

Reviewed-by: Christian König <christian.koenig@amd.com> (v1)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Link: https://patchwork.freedesktop.org/patch/msgid/20180503142603.28513-5-daniel.vetter@ffwll.ch
hifive-unleashed-5.1
Daniel Vetter 2018-05-03 16:25:52 +02:00
parent 070473bcf7
commit 418cc6ca06
4 changed files with 13 additions and 10 deletions
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1
drivers/dma-buf/dma-fence-array.c
View File

@ -104,7 +104,6 @@ const struct dma_fence_ops dma_fence_array_ops = {
.get_timeline_name = dma_fence_array_get_timeline_name,
.enable_signaling = dma_fence_array_enable_signaling,
.signaled = dma_fence_array_signaled,
.wait = dma_fence_default_wait,
.release = dma_fence_array_release,
};
EXPORT_SYMBOL(dma_fence_array_ops);

8
drivers/dma-buf/dma-fence.c
View File

@ -158,7 +158,10 @@ dma_fence_wait_timeout(struct dma_fence *fence, bool intr, signed long timeout)
return -EINVAL;
trace_dma_fence_wait_start(fence);
ret = fence->ops->wait(fence, intr, timeout);
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);
return ret;
}
@ -556,8 +559,7 @@ dma_fence_init(struct dma_fence *fence, const struct dma_fence_ops *ops,
spinlock_t *lock, u64 context, unsigned seqno)
{
BUG_ON(!lock);
BUG_ON(!ops || !ops->wait ||
!ops->get_driver_name || !ops->get_timeline_name);
BUG_ON(!ops || !ops->get_driver_name || !ops->get_timeline_name);
kref_init(&fence->refcount);
fence->ops = ops;

1
drivers/dma-buf/sw_sync.c
View File

@ -188,7 +188,6 @@ static const struct dma_fence_ops timeline_fence_ops = {
.get_timeline_name = timeline_fence_get_timeline_name,
.enable_signaling = timeline_fence_enable_signaling,
.signaled = timeline_fence_signaled,
.wait = dma_fence_default_wait,
.release = timeline_fence_release,
.fence_value_str = timeline_fence_value_str,
.timeline_value_str = timeline_fence_timeline_value_str,

13
include/linux/dma-fence.h
View File

@ -191,11 +191,14 @@ struct dma_fence_ops {
/**
* @wait:
*
* Custom wait implementation, or dma_fence_default_wait.
* Custom wait implementation, defaults to dma_fence_default_wait() if
* not set.
*
* Must not be NULL, set to dma_fence_default_wait for default implementation.
* the dma_fence_default_wait implementation should work for any fence, as long
* as enable_signaling works correctly.
* The dma_fence_default_wait implementation should work for any fence, as long
* as @enable_signaling works correctly. This hook allows drivers to
* have an optimized version for the case where a process context is
* already available, e.g. if @enable_signaling for the general case
* needs to set up a worker thread.
*
* Must return -ERESTARTSYS if the wait is intr = true and the wait was
* interrupted, and remaining jiffies if fence has signaled, or 0 if wait
@ -203,7 +206,7 @@ struct dma_fence_ops {
* which should be treated as if the fence is signaled. For example a hardware
* lockup could be reported like that.
*
* This callback is mandatory.
* This callback is optional.
*/
signed long (*wait)(struct dma_fence *fence,
bool intr, signed long timeout);