From: Christian König christian.koenig@amd.com
Instead of trying to flip inside the vblank period when the buffer is idle, offload blocking for idle to a kernel thread and program the flip directly into the hardware.
v2: add error handling, fix EBUSY handling v3: add proper exclusive_lock handling
Signed-off-by: Christian König christian.koenig@amd.com --- drivers/gpu/drm/radeon/radeon.h | 16 ++- drivers/gpu/drm/radeon/radeon_display.c | 245 ++++++++++++++++++-------------- drivers/gpu/drm/radeon/radeon_mode.h | 4 +- 3 files changed, 150 insertions(+), 115 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h index 4ae304d..736bfa2 100644 --- a/drivers/gpu/drm/radeon/radeon.h +++ b/drivers/gpu/drm/radeon/radeon.h @@ -676,14 +676,16 @@ void radeon_doorbell_free(struct radeon_device *rdev, u32 doorbell); * IRQS. */
-struct radeon_unpin_work { - struct work_struct work; - struct radeon_device *rdev; - int crtc_id; - struct radeon_fence *fence; +struct radeon_flip_work { + struct work_struct flip_work; + struct work_struct unpin_work; + struct radeon_device *rdev; + int crtc_id; + struct drm_framebuffer *fb; struct drm_pending_vblank_event *event; - struct radeon_bo *old_rbo; - u64 new_crtc_base; + struct radeon_bo *old_rbo; + struct radeon_bo *new_rbo; + struct radeon_fence *fence; };
struct r500_irq_stat_regs { diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c index 88e3cbe..6b3de5c 100644 --- a/drivers/gpu/drm/radeon/radeon_display.c +++ b/drivers/gpu/drm/radeon/radeon_display.c @@ -249,16 +249,21 @@ static void radeon_crtc_destroy(struct drm_crtc *crtc) struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
drm_crtc_cleanup(crtc); + destroy_workqueue(radeon_crtc->flip_queue); kfree(radeon_crtc); }
-/* - * Handle unpin events outside the interrupt handler proper. +/** + * radeon_unpin_work_func - unpin old buffer object + * + * @__work - kernel work item + * + * Unpin the old frame buffer object outside of the interrupt handler */ static void radeon_unpin_work_func(struct work_struct *__work) { - struct radeon_unpin_work *work = - container_of(__work, struct radeon_unpin_work, work); + struct radeon_flip_work *work = + container_of(__work, struct radeon_flip_work, unpin_work); int r;
/* unpin of the old buffer */ @@ -279,30 +284,19 @@ static void radeon_unpin_work_func(struct work_struct *__work) void radeon_crtc_handle_vblank(struct radeon_device *rdev, int crtc_id) { struct radeon_crtc *radeon_crtc = rdev->mode_info.crtcs[crtc_id]; - struct radeon_unpin_work *work; + struct radeon_flip_work *work; unsigned long flags; u32 update_pending; int vpos, hpos;
spin_lock_irqsave(&rdev->ddev->event_lock, flags); - work = radeon_crtc->unpin_work; - if (work == NULL || - (work->fence && !radeon_fence_signaled(work->fence))) { + work = radeon_crtc->flip_work; + if (work == NULL) { spin_unlock_irqrestore(&rdev->ddev->event_lock, flags); return; } - /* New pageflip, or just completion of a previous one? */ - if (!radeon_crtc->deferred_flip_completion) { - /* do the flip (mmio) */ - radeon_page_flip(rdev, crtc_id, work->new_crtc_base); - update_pending = radeon_page_flip_pending(rdev, crtc_id); - } else { - /* This is just a completion of a flip queued in crtc - * at last invocation. Make sure we go directly to - * completion routine. - */ - update_pending = 0; - } + + update_pending = radeon_page_flip_pending(rdev, crtc_id);
/* Has the pageflip already completed in crtc, or is it certain * to complete in this vblank? @@ -320,19 +314,9 @@ void radeon_crtc_handle_vblank(struct radeon_device *rdev, int crtc_id) */ update_pending = 0; } - if (update_pending) { - /* crtc didn't flip in this target vblank interval, - * but flip is pending in crtc. It will complete it - * in next vblank interval, so complete the flip at - * next vblank irq. - */ - radeon_crtc->deferred_flip_completion = 1; - spin_unlock_irqrestore(&rdev->ddev->event_lock, flags); - return; - } else { - spin_unlock_irqrestore(&rdev->ddev->event_lock, flags); + spin_unlock_irqrestore(&rdev->ddev->event_lock, flags); + if (!update_pending) radeon_crtc_handle_flip(rdev, crtc_id); - } }
/** @@ -346,7 +330,7 @@ void radeon_crtc_handle_vblank(struct radeon_device *rdev, int crtc_id) void radeon_crtc_handle_flip(struct radeon_device *rdev, int crtc_id) { struct radeon_crtc *radeon_crtc = rdev->mode_info.crtcs[crtc_id]; - struct radeon_unpin_work *work; + struct radeon_flip_work *work; unsigned long flags;
/* this can happen at init */ @@ -354,15 +338,14 @@ void radeon_crtc_handle_flip(struct radeon_device *rdev, int crtc_id) return;
spin_lock_irqsave(&rdev->ddev->event_lock, flags); - work = radeon_crtc->unpin_work; + work = radeon_crtc->flip_work; if (work == NULL) { spin_unlock_irqrestore(&rdev->ddev->event_lock, flags); return; }
- /* Pageflip (will be) certainly completed in this vblank. Clean up. */ - radeon_crtc->unpin_work = NULL; - radeon_crtc->deferred_flip_completion = 0; + /* Pageflip completed. Clean up. */ + radeon_crtc->flip_work = NULL;
/* wakeup userspace */ if (work->event) @@ -372,83 +355,69 @@ void radeon_crtc_handle_flip(struct radeon_device *rdev, int crtc_id)
radeon_fence_unref(&work->fence); radeon_irq_kms_pflip_irq_get(rdev, work->crtc_id); - schedule_work(&work->work); + queue_work(radeon_crtc->flip_queue, &work->unpin_work); }
-static int radeon_crtc_page_flip(struct drm_crtc *crtc, - struct drm_framebuffer *fb, - struct drm_pending_vblank_event *event, - uint32_t page_flip_flags) +/** + * radeon_flip_work_func - page flip framebuffer + * + * @work - kernel work item + * + * Wait for the buffer object to become idle and do the actual page flip + */ +static void radeon_flip_work_func(struct work_struct *__work) { - struct drm_device *dev = crtc->dev; - struct radeon_device *rdev = dev->dev_private; - struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc); - struct radeon_framebuffer *old_radeon_fb; - struct radeon_framebuffer *new_radeon_fb; - struct drm_gem_object *obj; - struct radeon_bo *rbo; - struct radeon_unpin_work *work; - unsigned long flags; - u32 tiling_flags, pitch_pixels; - u64 base; - int r; + struct radeon_flip_work *work = + container_of(__work, struct radeon_flip_work, flip_work); + struct radeon_device *rdev = work->rdev; + struct radeon_crtc *radeon_crtc = rdev->mode_info.crtcs[work->crtc_id];
- work = kzalloc(sizeof *work, GFP_KERNEL); - if (work == NULL) - return -ENOMEM; + struct drm_crtc *crtc = &radeon_crtc->base; + struct drm_framebuffer *fb = work->fb;
- work->event = event; - work->rdev = rdev; - work->crtc_id = radeon_crtc->crtc_id; - old_radeon_fb = to_radeon_framebuffer(crtc->primary->fb); - new_radeon_fb = to_radeon_framebuffer(fb); - /* schedule unpin of the old buffer */ - obj = old_radeon_fb->obj; - /* take a reference to the old object */ - drm_gem_object_reference(obj); - rbo = gem_to_radeon_bo(obj); - work->old_rbo = rbo; - obj = new_radeon_fb->obj; - rbo = gem_to_radeon_bo(obj); + uint32_t tiling_flags, pitch_pixels; + uint64_t base;
- spin_lock(&rbo->tbo.bdev->fence_lock); - if (rbo->tbo.sync_obj) - work->fence = radeon_fence_ref(rbo->tbo.sync_obj); - spin_unlock(&rbo->tbo.bdev->fence_lock); + unsigned long flags; + int r;
- INIT_WORK(&work->work, radeon_unpin_work_func); + down_read(&rdev->exclusive_lock); + while (work->fence) { + r = radeon_fence_wait(work->fence, false); + if (r == -EDEADLK) { + up_read(&rdev->exclusive_lock); + r = radeon_gpu_reset(rdev); + down_read(&rdev->exclusive_lock); + }
- /* We borrow the event spin lock for protecting unpin_work */ - spin_lock_irqsave(&dev->event_lock, flags); - if (radeon_crtc->unpin_work) { - DRM_DEBUG_DRIVER("flip queue: crtc already busy\n"); - r = -EBUSY; - goto unlock_free; + if (r) { + DRM_ERROR("failed to wait on page flip fence (%d)!\n", + r); + goto cleanup; + } else + radeon_fence_unref(&work->fence); } - radeon_crtc->unpin_work = work; - radeon_crtc->deferred_flip_completion = 0; - spin_unlock_irqrestore(&dev->event_lock, flags);
/* pin the new buffer */ DRM_DEBUG_DRIVER("flip-ioctl() cur_fbo = %p, cur_bbo = %p\n", - work->old_rbo, rbo); + work->old_rbo, work->new_rbo);
- r = radeon_bo_reserve(rbo, false); + r = radeon_bo_reserve(work->new_rbo, false); if (unlikely(r != 0)) { DRM_ERROR("failed to reserve new rbo buffer before flip\n"); - goto pflip_cleanup; + goto cleanup; } /* Only 27 bit offset for legacy CRTC */ - r = radeon_bo_pin_restricted(rbo, RADEON_GEM_DOMAIN_VRAM, + r = radeon_bo_pin_restricted(work->new_rbo, RADEON_GEM_DOMAIN_VRAM, ASIC_IS_AVIVO(rdev) ? 0 : 1 << 27, &base); if (unlikely(r != 0)) { - radeon_bo_unreserve(rbo); + radeon_bo_unreserve(work->new_rbo); r = -EINVAL; DRM_ERROR("failed to pin new rbo buffer before flip\n"); - goto pflip_cleanup; + goto cleanup; } - radeon_bo_get_tiling_flags(rbo, &tiling_flags, NULL); - radeon_bo_unreserve(rbo); + radeon_bo_get_tiling_flags(work->new_rbo, &tiling_flags, NULL); + radeon_bo_unreserve(work->new_rbo);
if (!ASIC_IS_AVIVO(rdev)) { /* crtc offset is from display base addr not FB location */ @@ -486,28 +455,91 @@ static int radeon_crtc_page_flip(struct drm_crtc *crtc, base &= ~7; }
- spin_lock_irqsave(&dev->event_lock, flags); - work->new_crtc_base = base; - spin_unlock_irqrestore(&dev->event_lock, flags); - - /* update crtc fb */ - crtc->primary->fb = fb; + /* We borrow the event spin lock for protecting flip_work */ + spin_lock_irqsave(&crtc->dev->event_lock, flags);
/* set the proper interrupt */ radeon_irq_kms_pflip_irq_get(rdev, radeon_crtc->crtc_id);
- return 0; + /* do the flip (mmio) */ + radeon_page_flip(rdev, radeon_crtc->crtc_id, base);
-pflip_cleanup: - spin_lock_irqsave(&dev->event_lock, flags); - radeon_crtc->unpin_work = NULL; -unlock_free: - spin_unlock_irqrestore(&dev->event_lock, flags); - drm_gem_object_unreference_unlocked(old_radeon_fb->obj); + spin_unlock_irqrestore(&crtc->dev->event_lock, flags); + up_read(&rdev->exclusive_lock); + + return; + +cleanup: + drm_gem_object_unreference_unlocked(&work->old_rbo->gem_base); radeon_fence_unref(&work->fence); kfree(work); + up_read(&rdev->exclusive_lock); +} + +static int radeon_crtc_page_flip(struct drm_crtc *crtc, + struct drm_framebuffer *fb, + struct drm_pending_vblank_event *event, + uint32_t page_flip_flags) +{ + struct drm_device *dev = crtc->dev; + struct radeon_device *rdev = dev->dev_private; + struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc); + struct radeon_framebuffer *old_radeon_fb; + struct radeon_framebuffer *new_radeon_fb; + struct drm_gem_object *obj; + struct radeon_flip_work *work; + unsigned long flags; + + work = kzalloc(sizeof *work, GFP_KERNEL); + if (work == NULL) + return -ENOMEM; + + INIT_WORK(&work->flip_work, radeon_flip_work_func); + INIT_WORK(&work->unpin_work, radeon_unpin_work_func);
- return r; + work->rdev = rdev; + work->crtc_id = radeon_crtc->crtc_id; + work->fb = fb; + work->event = event; + + /* schedule unpin of the old buffer */ + old_radeon_fb = to_radeon_framebuffer(crtc->primary->fb); + obj = old_radeon_fb->obj; + + /* take a reference to the old object */ + drm_gem_object_reference(obj); + work->old_rbo = gem_to_radeon_bo(obj); + + new_radeon_fb = to_radeon_framebuffer(fb); + obj = new_radeon_fb->obj; + work->new_rbo = gem_to_radeon_bo(obj); + + spin_lock(&work->new_rbo->tbo.bdev->fence_lock); + if (work->new_rbo->tbo.sync_obj) + work->fence = radeon_fence_ref(work->new_rbo->tbo.sync_obj); + spin_unlock(&work->new_rbo->tbo.bdev->fence_lock); + + /* update crtc fb */ + crtc->primary->fb = fb; + + /* We borrow the event spin lock for protecting flip_work */ + spin_lock_irqsave(&crtc->dev->event_lock, flags); + + if (radeon_crtc->flip_work) { + DRM_DEBUG_DRIVER("flip queue: crtc already busy\n"); + spin_unlock_irqrestore(&crtc->dev->event_lock, flags); + drm_gem_object_unreference_unlocked(&work->old_rbo->gem_base); + radeon_fence_unref(&work->fence); + kfree(work); + return -EBUSY; + } + radeon_crtc->flip_work = work; + + spin_unlock_irqrestore(&crtc->dev->event_lock, flags); + + queue_work(radeon_crtc->flip_queue, &work->flip_work); + + return 0; }
static int @@ -577,6 +609,7 @@ static void radeon_crtc_init(struct drm_device *dev, int index)
drm_mode_crtc_set_gamma_size(&radeon_crtc->base, 256); radeon_crtc->crtc_id = index; + radeon_crtc->flip_queue = create_singlethread_workqueue("radeon-crtc"); rdev->mode_info.crtcs[index] = radeon_crtc;
if (rdev->family >= CHIP_BONAIRE) { diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h index 718be1a..ea72ad8 100644 --- a/drivers/gpu/drm/radeon/radeon_mode.h +++ b/drivers/gpu/drm/radeon/radeon_mode.h @@ -325,8 +325,8 @@ struct radeon_crtc { struct drm_display_mode native_mode; int pll_id; /* page flipping */ - struct radeon_unpin_work *unpin_work; - int deferred_flip_completion; + struct workqueue_struct *flip_queue; + struct radeon_flip_work *flip_work; /* pll sharing */ struct radeon_atom_ss ss; bool ss_enabled;