Re: [PATCH v2 05/11] drm/i915: Allow mmio updates on all platforms, v2.

Ander Conselvan De Oliveira
2016-04-15T12:31:50Z

On Wed, 2016-04-13 at 11:18 +0200, Maarten Lankhorst wrote:
> Rename intel_unpin_work to intel_flip_work and use it for mmio flips
> and unpinning.

I think the rename should be a separate patch.

Ander

> Use flip_queued_req to hold the wait request in the
> mmio case and allow the vblank interrupt to complete mmio work to
> have mmio flips run correctly on g4 and earlier.
>
> Changes since v1:
> - Add smp_mb__after_atomic() to __intel_pageflip_stall_check,
> to match the smp_mb__before_atomic() in pipe_update_end().
> - Check for cur != flip_queued_vblank in pageflip_stall_check.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 4 +-
> drivers/gpu/drm/i915/intel_display.c | 271 +++++++++++-----------------------
> -
> drivers/gpu/drm/i915/intel_drv.h | 18 +--
> drivers/gpu/drm/i915/intel_sprite.c | 8 +-
> 4 files changed, 95 insertions(+), 206 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> b/drivers/gpu/drm/i915/i915_debugfs.c
> index c3b029e7bffd..5662cd5a1a9d 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -574,10 +574,10 @@ static int i915_gem_pageflip_info(struct seq_file *m,
> void *data)
> for_each_intel_crtc(dev, crtc) {
> const char pipe = pipe_name(crtc->pipe);
> const char plane = plane_name(crtc->plane);
> - struct intel_unpin_work *work;
> + struct intel_flip_work *work;
>
> spin_lock_irq(&dev->event_lock);
> - work = crtc->unpin_work;
> + work = crtc->flip_work;
> if (work == NULL) {
> seq_printf(m, "No flip due on pipe %c (plane %c)\n",
> pipe, plane);
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index f1a895153e64..b614f118b973 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -48,6 +48,11 @@
> #include <linux/reservation.h>
> #include <linux/dma-buf.h>
>
> +static bool is_mmio_work(struct intel_flip_work *work)
> +{
> + return work->mmio_work.func;
> +}
> +
> /* Primary plane formats for gen <= 3 */
> static const uint32_t i8xx_primary_formats[] = {
> DRM_FORMAT_C8,
> @@ -3285,7 +3290,7 @@ static bool intel_crtc_has_pending_flip(struct drm_crtc
> *crtc)
> return false;
>
> spin_lock_irq(&dev->event_lock);
> - pending = to_intel_crtc(crtc)->unpin_work != NULL;
> + pending = to_intel_crtc(crtc)->flip_work != NULL;
> spin_unlock_irq(&dev->event_lock);
>
> return pending;
> @@ -3864,7 +3869,7 @@ bool intel_has_pending_fb_unpin(struct drm_device *dev)
> if (atomic_read(&crtc->unpin_work_count) == 0)
> continue;
>
> - if (crtc->unpin_work)
> + if (crtc->flip_work)
> intel_wait_for_vblank(dev, crtc->pipe);
>
> return true;
> @@ -3876,11 +3881,11 @@ bool intel_has_pending_fb_unpin(struct drm_device
> *dev)
> static void page_flip_completed(struct intel_crtc *intel_crtc)
> {
> struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
> - struct intel_unpin_work *work = intel_crtc->unpin_work;
> + struct intel_flip_work *work = intel_crtc->flip_work;
>
> - /* ensure that the unpin work is consistent wrt ->pending. */
> + /* ensure that the flip work is consistent wrt ->pending. */
> smp_rmb();
> - intel_crtc->unpin_work = NULL;
> + intel_crtc->flip_work = NULL;
>
> if (work->event)
> drm_send_vblank_event(intel_crtc->base.dev,
> @@ -3890,7 +3895,7 @@ static void page_flip_completed(struct intel_crtc
> *intel_crtc)
> drm_crtc_vblank_put(&intel_crtc->base);
>
> wake_up_all(&dev_priv->pending_flip_queue);
> - queue_work(dev_priv->wq, &work->work);
> + queue_work(dev_priv->wq, &work->unpin_work);
>
> trace_i915_flip_complete(intel_crtc->plane,
> work->pending_flip_obj);
> @@ -3914,9 +3919,11 @@ static int intel_crtc_wait_for_pending_flips(struct
> drm_crtc *crtc)
>
> if (ret == 0) {
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> + struct intel_flip_work *work;
>
> spin_lock_irq(&dev->event_lock);
> - if (intel_crtc->unpin_work) {
> + work = intel_crtc->flip_work;
> + if (work && !is_mmio_work(work)) {
> WARN_ONCE(1, "Removing stuck page flip\n");
> page_flip_completed(intel_crtc);
> }
> @@ -6308,7 +6315,7 @@ static void intel_crtc_disable_noatomic(struct drm_crtc
> *crtc)
> return;
>
> if (to_intel_plane_state(crtc->primary->state)->visible) {
> - WARN_ON(intel_crtc->unpin_work);
> + WARN_ON(intel_crtc->flip_work);
>
> intel_pre_disable_primary_noatomic(crtc);
>
> @@ -10881,15 +10888,16 @@ static void intel_crtc_destroy(struct drm_crtc
> *crtc)
> {
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> struct drm_device *dev = crtc->dev;
> - struct intel_unpin_work *work;
> + struct intel_flip_work *work;
>
> spin_lock_irq(&dev->event_lock);
> - work = intel_crtc->unpin_work;
> - intel_crtc->unpin_work = NULL;
> + work = intel_crtc->flip_work;
> + intel_crtc->flip_work = NULL;
> spin_unlock_irq(&dev->event_lock);
>
> if (work) {
> - cancel_work_sync(&work->work);
> + cancel_work_sync(&work->mmio_work);
> + cancel_work_sync(&work->unpin_work);
> kfree(work);
> }
>
> @@ -10900,12 +10908,15 @@ static void intel_crtc_destroy(struct drm_crtc
> *crtc)
>
> static void intel_unpin_work_fn(struct work_struct *__work)
> {
> - struct intel_unpin_work *work =
> - container_of(__work, struct intel_unpin_work, work);
> + struct intel_flip_work *work =
> + container_of(__work, struct intel_flip_work, unpin_work);
> struct intel_crtc *crtc = to_intel_crtc(work->crtc);
> struct drm_device *dev = crtc->base.dev;
> struct drm_plane *primary = crtc->base.primary;
>
> + if (is_mmio_work(work))
> + flush_work(&work->mmio_work);
> +
> mutex_lock(&dev->struct_mutex);
> intel_unpin_fb_obj(work->old_fb, primary->state->rotation);
> drm_gem_object_unreference(&work->pending_flip_obj->base);
> @@ -10971,16 +10982,16 @@ static bool page_flip_finished(struct intel_crtc
> *crtc)
> * anyway, we don't really care.
> */
> return (I915_READ(DSPSURFLIVE(crtc->plane)) & ~0xfff) ==
> - crtc->unpin_work->gtt_offset &&
> + crtc->flip_work->gtt_offset &&
> g4x_flip_count_after_eq(I915_READ(PIPE_FLIPCOUNT_G4X(crtc
> ->pipe)),
> - crtc->unpin_work->flip_count);
> + crtc->flip_work->flip_count);
> }
>
> static void do_intel_finish_page_flip(struct drm_device *dev,
> struct drm_crtc *crtc)
> {
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> - struct intel_unpin_work *work;
> + struct intel_flip_work *work;
> unsigned long flags;
>
> /* Ignore early vblank irqs */
> @@ -10992,11 +11003,11 @@ static void do_intel_finish_page_flip(struct
> drm_device *dev,
> * lost pageflips) so needs the full irqsave spinlocks.
> */
> spin_lock_irqsave(&dev->event_lock, flags);
> - work = intel_crtc->unpin_work;
> + work = intel_crtc->flip_work;
>
> if (work == NULL ||
> atomic_read(&work->pending) == INTEL_FLIP_INACTIVE ||
> - !page_flip_finished(intel_crtc)) {
> + !page_flip_finished(intel_crtc)) {
> spin_unlock_irqrestore(&dev->event_lock, flags);
> return;
> }
> @@ -11022,7 +11033,7 @@ void intel_finish_page_flip_plane(struct drm_device
> *dev, int plane)
> do_intel_finish_page_flip(dev, crtc);
> }
>
> -static inline void intel_mark_page_flip_active(struct intel_unpin_work *work)
> +static inline void intel_mark_page_flip_active(struct intel_flip_work *work)
> {
> /* Ensure that the work item is consistent when activating it ... */
> smp_wmb();
> @@ -11059,10 +11070,9 @@ static int intel_gen2_queue_flip(struct drm_device
> *dev,
> intel_ring_emit(engine, MI_DISPLAY_FLIP |
> MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
> intel_ring_emit(engine, fb->pitches[0]);
> - intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset);
> + intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset);
> intel_ring_emit(engine, 0); /* aux display base address, unused */
>
> - intel_mark_page_flip_active(intel_crtc->unpin_work);
> return 0;
> }
>
> @@ -11091,10 +11101,9 @@ static int intel_gen3_queue_flip(struct drm_device
> *dev,
> intel_ring_emit(engine, MI_DISPLAY_FLIP_I915 |
> MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
> intel_ring_emit(engine, fb->pitches[0]);
> - intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset);
> + intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset);
> intel_ring_emit(engine, MI_NOOP);
>
> - intel_mark_page_flip_active(intel_crtc->unpin_work);
> return 0;
> }
>
> @@ -11122,7 +11131,7 @@ static int intel_gen4_queue_flip(struct drm_device
> *dev,
> intel_ring_emit(engine, MI_DISPLAY_FLIP |
> MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
> intel_ring_emit(engine, fb->pitches[0]);
> - intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset |
> + intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset |
> obj->tiling_mode);
>
> /* XXX Enabling the panel-fitter across page-flip is so far
> @@ -11133,7 +11142,6 @@ static int intel_gen4_queue_flip(struct drm_device
> *dev,
> pipesrc = I915_READ(PIPESRC(intel_crtc->pipe)) & 0x0fff0fff;
> intel_ring_emit(engine, pf | pipesrc);
>
> - intel_mark_page_flip_active(intel_crtc->unpin_work);
> return 0;
> }
>
> @@ -11157,7 +11165,7 @@ static int intel_gen6_queue_flip(struct drm_device
> *dev,
> intel_ring_emit(engine, MI_DISPLAY_FLIP |
> MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
> intel_ring_emit(engine, fb->pitches[0] | obj->tiling_mode);
> - intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset);
> + intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset);
>
> /* Contrary to the suggestions in the documentation,
> * "Enable Panel Fitter" does not seem to be required when page
> @@ -11169,7 +11177,6 @@ static int intel_gen6_queue_flip(struct drm_device
> *dev,
> pipesrc = I915_READ(PIPESRC(intel_crtc->pipe)) & 0x0fff0fff;
> intel_ring_emit(engine, pf | pipesrc);
>
> - intel_mark_page_flip_active(intel_crtc->unpin_work);
> return 0;
> }
>
> @@ -11261,10 +11268,9 @@ static int intel_gen7_queue_flip(struct drm_device
> *dev,
>
> intel_ring_emit(engine, MI_DISPLAY_FLIP_I915 | plane_bit);
> intel_ring_emit(engine, (fb->pitches[0] | obj->tiling_mode));
> - intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset);
> + intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset);
> intel_ring_emit(engine, (MI_NOOP));
>
> - intel_mark_page_flip_active(intel_crtc->unpin_work);
> return 0;
> }
>
> @@ -11282,9 +11288,6 @@ static bool use_mmio_flip(struct intel_engine_cs
> *engine,
> if (engine == NULL)
> return true;
>
> - if (INTEL_INFO(engine->dev)->gen < 5)
> - return false;
> -
> if (i915.use_mmio_flip < 0)
> return false;
> else if (i915.use_mmio_flip > 0)
> @@ -11299,126 +11302,21 @@ static bool use_mmio_flip(struct intel_engine_cs
> *engine,
> return engine != i915_gem_request_get_engine(obj
> ->last_write_req);
> }
>
> -static void skl_do_mmio_flip(struct intel_crtc *intel_crtc,
> - unsigned int rotation,
> - struct intel_unpin_work *work)
> +static void intel_mmio_flip_work_func(struct work_struct *w)
> {
> - struct drm_device *dev = intel_crtc->base.dev;
> - struct drm_i915_private *dev_priv = dev->dev_private;
> - struct drm_framebuffer *fb = intel_crtc->base.primary->fb;
> - const enum pipe pipe = intel_crtc->pipe;
> - u32 ctl, stride, tile_height;
> -
> - ctl = I915_READ(PLANE_CTL(pipe, 0));
> - ctl &= ~PLANE_CTL_TILED_MASK;
> - switch (fb->modifier[0]) {
> - case DRM_FORMAT_MOD_NONE:
> - break;
> - case I915_FORMAT_MOD_X_TILED:
> - ctl |= PLANE_CTL_TILED_X;
> - break;
> - case I915_FORMAT_MOD_Y_TILED:
> - ctl |= PLANE_CTL_TILED_Y;
> - break;
> - case I915_FORMAT_MOD_Yf_TILED:
> - ctl |= PLANE_CTL_TILED_YF;
> - break;
> - default:
> - MISSING_CASE(fb->modifier[0]);
> - }
> -
> - /*
> - * The stride is either expressed as a multiple of 64 bytes chunks
> for
> - * linear buffers or in number of tiles for tiled buffers.
> - */
> - if (intel_rotation_90_or_270(rotation)) {
> - /* stride = Surface height in tiles */
> - tile_height = intel_tile_height(dev_priv, fb->modifier[0],
> 0);
> - stride = DIV_ROUND_UP(fb->height, tile_height);
> - } else {
> - stride = fb->pitches[0] /
> - intel_fb_stride_alignment(dev_priv, fb->modifier[0],
> - fb->pixel_format);
> - }
> -
> - /*
> - * Both PLANE_CTL and PLANE_STRIDE are not updated on vblank but on
> - * PLANE_SURF updates, the update is then guaranteed to be atomic.
> - */
> - I915_WRITE(PLANE_CTL(pipe, 0), ctl);
> - I915_WRITE(PLANE_STRIDE(pipe, 0), stride);
> -
> - I915_WRITE(PLANE_SURF(pipe, 0), work->gtt_offset);
> - POSTING_READ(PLANE_SURF(pipe, 0));
> -}
> -
> -static void ilk_do_mmio_flip(struct intel_crtc *intel_crtc,
> - struct intel_unpin_work *work)
> -{
> - struct drm_device *dev = intel_crtc->base.dev;
> + struct intel_flip_work *work =
> + container_of(w, struct intel_flip_work, mmio_work);
> + struct intel_crtc *crtc = to_intel_crtc(work->crtc);
> + struct drm_device *dev = crtc->base.dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> - struct intel_framebuffer *intel_fb =
> - to_intel_framebuffer(intel_crtc->base.primary->fb);
> - struct drm_i915_gem_object *obj = intel_fb->obj;
> - i915_reg_t reg = DSPCNTR(intel_crtc->plane);
> - u32 dspcntr;
> -
> - dspcntr = I915_READ(reg);
> -
> - if (obj->tiling_mode != I915_TILING_NONE)
> - dspcntr |= DISPPLANE_TILED;
> - else
> - dspcntr &= ~DISPPLANE_TILED;
> + struct intel_plane *primary = to_intel_plane(crtc->base.primary);
> + struct drm_i915_gem_object *obj = intel_fb_obj(primary->base.state
> ->fb);
>
> - I915_WRITE(reg, dspcntr);
> -
> - I915_WRITE(DSPSURF(intel_crtc->plane), work->gtt_offset);
> - POSTING_READ(DSPSURF(intel_crtc->plane));
> -}
> -
> -/*
> - * XXX: This is the temporary way to update the plane registers until we get
> - * around to using the usual plane update functions for MMIO flips
> - */
> -static void intel_do_mmio_flip(struct intel_mmio_flip *mmio_flip)
> -{
> - struct intel_crtc *crtc = mmio_flip->crtc;
> - struct intel_unpin_work *work;
> -
> - spin_lock_irq(&crtc->base.dev->event_lock);
> - work = crtc->unpin_work;
> - spin_unlock_irq(&crtc->base.dev->event_lock);
> - if (work == NULL)
> - return;
> -
> - intel_pipe_update_start(crtc);
> -
> - if (INTEL_INFO(mmio_flip->i915)->gen >= 9)
> - skl_do_mmio_flip(crtc, mmio_flip->rotation, work);
> - else
> - /* use_mmio_flip() retricts MMIO flips to ilk+ */
> - ilk_do_mmio_flip(crtc, work);
> -
> - intel_pipe_update_end(crtc);
> -
> - intel_mark_page_flip_active(work);
> -}
> -
> -static void intel_mmio_flip_work_func(struct work_struct *work)
> -{
> - struct intel_mmio_flip *mmio_flip =
> - container_of(work, struct intel_mmio_flip, work);
> - struct intel_framebuffer *intel_fb =
> - to_intel_framebuffer(mmio_flip->crtc->base.primary->fb);
> - struct drm_i915_gem_object *obj = intel_fb->obj;
> -
> - if (mmio_flip->req) {
> - WARN_ON(__i915_wait_request(mmio_flip->req,
> - mmio_flip->crtc->reset_counter,
> + if (work->flip_queued_req)
> + WARN_ON(__i915_wait_request(work->flip_queued_req,
> + crtc->reset_counter,
> false, NULL,
> - &mmio_flip->i915
> ->rps.mmioflips));
> - i915_gem_request_unreference__unlocked(mmio_flip->req);
> - }
> + &dev_priv->rps.mmioflips));
>
> /* For framebuffer backed by dmabuf, wait for fence */
> if (obj->base.dma_buf)
> @@ -11426,29 +11324,11 @@ static void intel_mmio_flip_work_func(struct
> work_struct *work)
> false, false,
>
> MAX_SCHEDULE_TIMEOUT) < 0);
>
> - intel_do_mmio_flip(mmio_flip);
> - kfree(mmio_flip);
> -}
> -
> -static int intel_queue_mmio_flip(struct drm_device *dev,
> - struct drm_crtc *crtc,
> - struct drm_i915_gem_object *obj)
> -{
> - struct intel_mmio_flip *mmio_flip;
> -
> - mmio_flip = kmalloc(sizeof(*mmio_flip), GFP_KERNEL);
> - if (mmio_flip == NULL)
> - return -ENOMEM;
> -
> - mmio_flip->i915 = to_i915(dev);
> - mmio_flip->req = i915_gem_request_reference(obj->last_write_req);
> - mmio_flip->crtc = to_intel_crtc(crtc);
> - mmio_flip->rotation = crtc->primary->state->rotation;
> -
> - INIT_WORK(&mmio_flip->work, intel_mmio_flip_work_func);
> - schedule_work(&mmio_flip->work);
> -
> - return 0;
> + intel_pipe_update_start(crtc);
> + primary->update_plane(&primary->base,
> + crtc->config,
> + to_intel_plane_state(primary->base.state));
> + intel_pipe_update_end(crtc, work);
> }
>
> static int intel_default_queue_flip(struct drm_device *dev,
> @@ -11466,7 +11346,7 @@ static bool __intel_pageflip_stall_check(struct
> drm_device *dev,
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> - struct intel_unpin_work *work = intel_crtc->unpin_work;
> + struct intel_flip_work *work = intel_crtc->flip_work;
> u32 addr;
> u32 pending;
>
> @@ -11474,6 +11354,15 @@ static bool __intel_pageflip_stall_check(struct
> drm_device *dev,
> if (pending == INTEL_FLIP_INACTIVE)
> return false;
>
> + smp_mb__after_atomic();
> +
> + if (is_mmio_work(work)) {
> + u32 cur = intel_crtc_get_vblank_counter(intel_crtc);
> +
> + /* MMIO work completes when vblank is different from
> flip_queued_vblank. */
> + return cur != work->flip_queued_vblank;
> + }
> +
> if (work->flip_ready_vblank == 0) {
> if (work->flip_queued_req &&
> !i915_gem_request_completed(work->flip_queued_req, true))
> @@ -11504,7 +11393,7 @@ void intel_check_page_flip(struct drm_device *dev, int
> pipe)
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> - struct intel_unpin_work *work;
> + struct intel_flip_work *work;
>
> WARN_ON(!in_interrupt());
>
> @@ -11512,14 +11401,15 @@ void intel_check_page_flip(struct drm_device *dev,
> int pipe)
> return;
>
> spin_lock(&dev->event_lock);
> - work = intel_crtc->unpin_work;
> + work = intel_crtc->flip_work;
> if (work != NULL && __intel_pageflip_stall_check(dev, crtc)) {
> - WARN_ONCE(1, "Kicking stuck page flip: queued at %d, now
> %d\n",
> + WARN_ONCE(!is_mmio_work(work),
> + "Kicking stuck page flip: queued at %d, now %d\n",
> work->flip_queued_vblank, drm_vblank_count(dev,
> pipe));
> page_flip_completed(intel_crtc);
> work = NULL;
> }
> - if (work != NULL &&
> + if (work != NULL && !is_mmio_work(work) &&
> drm_vblank_count(dev, pipe) - work->flip_queued_vblank > 1)
> intel_queue_rps_boost_for_request(dev, work
> ->flip_queued_req);
> spin_unlock(&dev->event_lock);
> @@ -11537,7 +11427,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> struct drm_plane *primary = crtc->primary;
> enum pipe pipe = intel_crtc->pipe;
> - struct intel_unpin_work *work;
> + struct intel_flip_work *work;
> struct intel_engine_cs *engine;
> bool mmio_flip;
> struct drm_i915_gem_request *request = NULL;
> @@ -11574,15 +11464,15 @@ static int intel_crtc_page_flip(struct drm_crtc
> *crtc,
> work->event = event;
> work->crtc = crtc;
> work->old_fb = old_fb;
> - INIT_WORK(&work->work, intel_unpin_work_fn);
> + INIT_WORK(&work->unpin_work, intel_unpin_work_fn);
>
> ret = drm_crtc_vblank_get(crtc);
> if (ret)
> goto free_work;
>
> - /* We borrow the event spin lock for protecting unpin_work */
> + /* We borrow the event spin lock for protecting flip_work */
> spin_lock_irq(&dev->event_lock);
> - if (intel_crtc->unpin_work) {
> + if (intel_crtc->flip_work) {
> /* Before declaring the flip queue wedged, check if
> * the hardware completed the operation behind our backs.
> */
> @@ -11598,7 +11488,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
> return -EBUSY;
> }
> }
> - intel_crtc->unpin_work = work;
> + intel_crtc->flip_work = work;
> spin_unlock_irq(&dev->event_lock);
>
> if (atomic_read(&intel_crtc->unpin_work_count) >= 2)
> @@ -11667,23 +11557,22 @@ static int intel_crtc_page_flip(struct drm_crtc
> *crtc,
> work->flip_queued_vblank = drm_crtc_vblank_count(crtc);
>
> if (mmio_flip) {
> - ret = intel_queue_mmio_flip(dev, crtc, obj);
> - if (ret)
> - goto cleanup_unpin;
> + INIT_WORK(&work->mmio_work, intel_mmio_flip_work_func);
>
> i915_gem_request_assign(&work->flip_queued_req,
> obj->last_write_req);
> +
> + schedule_work(&work->mmio_work);
> } else {
> + i915_gem_request_assign(&work->flip_queued_req, request);
> ret = dev_priv->display.queue_flip(dev, crtc, fb, obj,
> request,
> page_flip_flags);
> if (ret)
> goto cleanup_unpin;
>
> - i915_gem_request_assign(&work->flip_queued_req, request);
> - }
> -
> - if (request)
> + intel_mark_page_flip_active(work);
> i915_add_request_no_flush(request);
> + }
>
> work->flip_queued_vblank = drm_crtc_vblank_count(crtc);
>
> @@ -11713,7 +11602,7 @@ cleanup:
> drm_framebuffer_unreference(work->old_fb);
>
> spin_lock_irq(&dev->event_lock);
> - intel_crtc->unpin_work = NULL;
> + intel_crtc->flip_work = NULL;
> spin_unlock_irq(&dev->event_lock);
>
> drm_crtc_vblank_put(crtc);
> @@ -14018,7 +13907,7 @@ static void intel_finish_crtc_commit(struct drm_crtc
> *crtc,
> {
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
>
> - intel_pipe_update_end(intel_crtc);
> + intel_pipe_update_end(intel_crtc, NULL);
> }
>
> /**
> diff --git a/drivers/gpu/drm/i915/intel_drv.h
> b/drivers/gpu/drm/i915/intel_drv.h
> index a2712f6f1eb3..d46aff0350a0 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -592,14 +592,6 @@ struct vlv_wm_state {
> bool cxsr;
> };
>
> -struct intel_mmio_flip {
> - struct work_struct work;
> - struct drm_i915_private *i915;
> - struct drm_i915_gem_request *req;
> - struct intel_crtc *crtc;
> - unsigned int rotation;
> -};
> -
> struct intel_crtc {
> struct drm_crtc base;
> enum pipe pipe;
> @@ -614,7 +606,7 @@ struct intel_crtc {
> unsigned long enabled_power_domains;
> bool lowfreq_avail;
> struct intel_overlay *overlay;
> - struct intel_unpin_work *unpin_work;
> + struct intel_flip_work *flip_work;
>
> atomic_t unpin_work_count;
>
> @@ -937,8 +929,10 @@ intel_get_crtc_for_plane(struct drm_device *dev, int
> plane)
> return dev_priv->plane_to_crtc_mapping[plane];
> }
>
> -struct intel_unpin_work {
> - struct work_struct work;
> +struct intel_flip_work {
> + struct work_struct unpin_work;
> + struct work_struct mmio_work;
> +
> struct drm_crtc *crtc;
> struct drm_framebuffer *old_fb;
> struct drm_i915_gem_object *pending_flip_obj;
> @@ -1618,7 +1612,7 @@ int intel_plane_init(struct drm_device *dev, enum pipe
> pipe, int plane);
> int intel_sprite_set_colorkey(struct drm_device *dev, void *data,
> struct drm_file *file_priv);
> void intel_pipe_update_start(struct intel_crtc *crtc);
> -void intel_pipe_update_end(struct intel_crtc *crtc);
> +void intel_pipe_update_end(struct intel_crtc *crtc, struct intel_flip_work
> *work);
>
> /* intel_tv.c */
> void intel_tv_init(struct drm_device *dev);
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c
> b/drivers/gpu/drm/i915/intel_sprite.c
> index e2de6b0df5a8..8ec7ce549835 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -151,13 +151,19 @@ void intel_pipe_update_start(struct intel_crtc *crtc)
> * re-enables interrupts and verifies the update was actually completed
> * before a vblank using the value of @start_vbl_count.
> */
> -void intel_pipe_update_end(struct intel_crtc *crtc)
> +void intel_pipe_update_end(struct intel_crtc *crtc, struct intel_flip_work
> *work)
> {
> enum pipe pipe = crtc->pipe;
> int scanline_end = intel_get_crtc_scanline(crtc);
> u32 end_vbl_count = intel_crtc_get_vblank_counter(crtc);
> ktime_t end_vbl_time = ktime_get();
>
> + if (work) {
> + work->flip_queued_vblank = end_vbl_count;
> + smp_mb__before_atomic();
> + atomic_set(&work->pending, INTEL_FLIP_PENDING);
> + }
> +
> trace_i915_pipe_update_end(crtc, end_vbl_count, scanline_end);
>
> local_irq_enable();