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drm/amdgpu: stop blocking for page filp fences 

Just register an callback and reschedule the work item if necessary.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2016-02-11 15:48:30 +01:00 committed by Alex Deucher
parent 6800e2ea2e
commit c3874b758a
2 changed files with 28 additions and 16 deletions
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1
drivers/gpu/drm/amd/amdgpu/amdgpu.h
View File

@ -761,6 +761,7 @@ struct amdgpu_flip_work {
struct fence *excl;
unsigned shared_count;
struct fence **shared;
struct fence_cb cb;
};

43
drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
View File

@ -35,24 +35,32 @@
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>
static void amdgpu_flip_wait_fence(struct amdgpu_device *adev,
struct fence **f)
static void amdgpu_flip_callback(struct fence *f, struct fence_cb *cb)
{
long r;
struct amdgpu_flip_work *work =
container_of(cb, struct amdgpu_flip_work, cb);
struct amdgpu_device *adev = work->adev;
struct amdgpu_crtc *amdgpu_crtc = adev->mode_info.crtcs[work->crtc_id];
if (*f == NULL)
return;
fence_put(f);
queue_work(amdgpu_crtc->pflip_queue, &work->flip_work);
}
r = fence_wait(*f, false);
if (r)
DRM_ERROR("failed to wait on page flip fence (%ld)!\n", r);
static bool amdgpu_flip_handle_fence(struct amdgpu_flip_work *work,
struct fence **f)
{
struct fence *fence= *f;
if (fence == NULL)
return false;
/* We continue with the page flip even if we failed to wait on
* the fence, otherwise the DRM core and userspace will be
* confused about which BO the CRTC is scanning out
*/
fence_put(*f);
*f = NULL;
if (!fence_add_callback(fence, &work->cb, amdgpu_flip_callback))
return true;
fence_put(*f);
return false;
}
static void amdgpu_flip_work_func(struct work_struct *__work)
@ -68,9 +76,12 @@ static void amdgpu_flip_work_func(struct work_struct *__work)
int vpos, hpos, stat, min_udelay;
struct drm_vblank_crtc *vblank = &crtc->dev->vblank[work->crtc_id];
amdgpu_flip_wait_fence(adev, &work->excl);
if (amdgpu_flip_handle_fence(work, &work->excl))
return;
for (i = 0; i < work->shared_count; ++i)
amdgpu_flip_wait_fence(adev, &work->shared[i]);
if (amdgpu_flip_handle_fence(work, &work->shared[i]))
return;
/* We borrow the event spin lock for protecting flip_status */
spin_lock_irqsave(&crtc->dev->event_lock, flags);
@ -234,7 +245,7 @@ int amdgpu_crtc_page_flip(struct drm_crtc *crtc,
/* update crtc fb */
crtc->primary->fb = fb;
spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
queue_work(amdgpu_crtc->pflip_queue, &work->flip_work);
amdgpu_flip_work_func(&work->flip_work);
return 0;
vblank_cleanup: