[PATCH 4/5] drm/radeon: rework page flip handling
Christian König
deathsimple at vodafone.de
Tue Apr 29 07:29:32 PDT 2014
From: Christian König <christian.koenig at 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.
Signed-off-by: Christian König <christian.koenig at amd.com>
---
drivers/gpu/drm/radeon/radeon.h | 16 ++-
drivers/gpu/drm/radeon/radeon_display.c | 231 +++++++++++++++++---------------
drivers/gpu/drm/radeon/radeon_mode.h | 4 +-
3 files changed, 134 insertions(+), 117 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index fb7c499..1666eac 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 af6e5ae..b721261 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 */
@@ -279,7 +284,7 @@ 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;
@@ -289,24 +294,13 @@ void radeon_crtc_handle_vblank(struct radeon_device *rdev, int crtc_id)
return;
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?
@@ -324,19 +318,9 @@ 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);
- }
}
/**
@@ -350,7 +334,7 @@ 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 */
@@ -358,15 +342,14 @@ 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)
@@ -377,83 +360,59 @@ void radeon_crtc_handle_flip(struct radeon_device *rdev, int crtc_id)
drm_vblank_put(rdev->ddev, radeon_crtc->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);
+ if (work->fence) {
+ r = radeon_fence_wait(work->fence, false);
+ //TODO error handling
- /* 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;
+ 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;
}
/* 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;
}
- 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 */
@@ -491,44 +450,99 @@ 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;
-
- r = drm_vblank_get(dev, radeon_crtc->crtc_id);
+ r = drm_vblank_get(crtc->dev, radeon_crtc->crtc_id);
if (r) {
DRM_ERROR("failed to get vblank before flip\n");
goto pflip_cleanup1;
}
+ /* 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);
+ goto pflip_cleanup1;
+ }
+ radeon_crtc->flip_work = work;
+
/* 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);
+
+ spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
+
+ return;
pflip_cleanup1:
- if (unlikely(radeon_bo_reserve(rbo, false) != 0)) {
+ if (unlikely(radeon_bo_reserve(work->new_rbo, false) != 0)) {
DRM_ERROR("failed to reserve new rbo in error path\n");
goto pflip_cleanup;
}
- if (unlikely(radeon_bo_unpin(rbo) != 0)) {
+ if (unlikely(radeon_bo_unpin(work->new_rbo) != 0)) {
DRM_ERROR("failed to unpin new rbo in error path\n");
}
- radeon_bo_unreserve(rbo);
+ radeon_bo_unreserve(work->new_rbo);
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);
+ drm_gem_object_unreference_unlocked(&work->old_rbo->gem_base);
radeon_fence_unref(&work->fence);
kfree(work);
+}
- return r;
+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;
+
+ 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);
+
+ 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;
+
+ if (work->fence)
+ queue_work(radeon_crtc->flip_queue, &work->flip_work);
+ else
+ radeon_flip_work_func(&work->flip_work);
+
+ return 0;
}
static int
@@ -598,6 +612,7 @@ 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 eda6367..b59096f 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -324,8 +324,8 @@ 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;
--
1.9.1
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