Patchwork [8/9] drm/i915: Remove intel_flip_work infrastructure

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Submitter Daniel Vetter
Date July 19, 2017, 12:55 p.m.
Message ID <20170719125502.25696-9-daniel.vetter@ffwll.ch>
Download mbox | patch
Permalink /patch/9851967/
State New
Headers show

Comments

Daniel Vetter - July 19, 2017, 12:55 p.m.
This gets rid of all the interactions between the legacy flip code and
the modeset code. Yay!

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c  |  70 ---------------------
 drivers/gpu/drm/i915/i915_drv.c      |   1 -
 drivers/gpu/drm/i915/i915_drv.h      |   4 --
 drivers/gpu/drm/i915/i915_gem.c      |   2 -
 drivers/gpu/drm/i915/intel_display.c | 117 +----------------------------------
 drivers/gpu/drm/i915/intel_drv.h     |  21 +------
 drivers/gpu/drm/i915/intel_sprite.c  |   8 +--
 7 files changed, 3 insertions(+), 220 deletions(-)
Chris Wilson - July 19, 2017, 1:07 p.m.
Quoting Daniel Vetter (2017-07-19 13:55:01)
> This gets rid of all the interactions between the legacy flip code and
> the modeset code. Yay!

Including our missed vblank boosting. (That's been dead for a while.)
-Chris
Daniel Vetter - July 19, 2017, 1:24 p.m.
On Wed, Jul 19, 2017 at 02:07:36PM +0100, Chris Wilson wrote:
> Quoting Daniel Vetter (2017-07-19 13:55:01)
> > This gets rid of all the interactions between the legacy flip code and
> > the modeset code. Yay!
> 
> Including our missed vblank boosting. (That's been dead for a while.)

Hm right, but should be easy to add (and bonus, for every display update,
not just flips) in the intel_sw_fence_wait function. Can you pls point me
at what function I should call to reverse-boost an i915_sw_fence (and only
that)?

Then we could queue up a vblank callback that fires on the next vblank for
any of the CRTC in the update and boosts the i915_sw_fence. If we just
boost the fence (instead of the context or something) it should also be
easy to filter out boosting when the request has completed meanwhile.
-Daniel
Chris Wilson - July 19, 2017, 2:16 p.m.
Quoting Daniel Vetter (2017-07-19 14:24:20)
> On Wed, Jul 19, 2017 at 02:07:36PM +0100, Chris Wilson wrote:
> > Quoting Daniel Vetter (2017-07-19 13:55:01)
> > > This gets rid of all the interactions between the legacy flip code and
> > > the modeset code. Yay!
> > 
> > Including our missed vblank boosting. (That's been dead for a while.)
> 
> Hm right, but should be easy to add (and bonus, for every display update,
> not just flips) in the intel_sw_fence_wait function. Can you pls point me
> at what function I should call to reverse-boost an i915_sw_fence (and only
> that)?

You would have to walk the tree of input sw fences, detect those are
dma_fences and check if they are a request. Then for each request mark
it as boosted. That information is easier to keep during construction
rather than recovering it later, though honestly, I would just boost the
exclusive fences for the atomic state, i.e. use the reservation_object 
under the assumption that the snapshot hasn't drifted too much.

> Then we could queue up a vblank callback that fires on the next vblank for
> any of the CRTC in the update and boosts the i915_sw_fence. If we just
> boost the fence (instead of the context or something) it should also be
> easy to filter out boosting when the request has completed meanwhile.

Yup, boosting is now completely tied to requests.
-Chris

Patch

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 2ef75c1a6119..c25f42c60d61 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -543,75 +543,6 @@  static int i915_gem_gtt_info(struct seq_file *m, void *data)
 	return 0;
 }
 
-static int i915_gem_pageflip_info(struct seq_file *m, void *data)
-{
-	struct drm_i915_private *dev_priv = node_to_i915(m->private);
-	struct drm_device *dev = &dev_priv->drm;
-	struct intel_crtc *crtc;
-	int ret;
-
-	ret = mutex_lock_interruptible(&dev->struct_mutex);
-	if (ret)
-		return ret;
-
-	for_each_intel_crtc(dev, crtc) {
-		const char pipe = pipe_name(crtc->pipe);
-		const char plane = plane_name(crtc->plane);
-		struct intel_flip_work *work;
-
-		spin_lock_irq(&dev->event_lock);
-		work = crtc->flip_work;
-		if (work == NULL) {
-			seq_printf(m, "No flip due on pipe %c (plane %c)\n",
-				   pipe, plane);
-		} else {
-			u32 pending;
-			u32 addr;
-
-			pending = atomic_read(&work->pending);
-			if (pending) {
-				seq_printf(m, "Flip ioctl preparing on pipe %c (plane %c)\n",
-					   pipe, plane);
-			} else {
-				seq_printf(m, "Flip pending (waiting for vsync) on pipe %c (plane %c)\n",
-					   pipe, plane);
-			}
-			if (work->flip_queued_req) {
-				struct intel_engine_cs *engine = work->flip_queued_req->engine;
-
-				seq_printf(m, "Flip queued on %s at seqno %x, last submitted seqno %x [current breadcrumb %x], completed? %d\n",
-					   engine->name,
-					   work->flip_queued_req->global_seqno,
-					   intel_engine_last_submit(engine),
-					   intel_engine_get_seqno(engine),
-					   i915_gem_request_completed(work->flip_queued_req));
-			} else
-				seq_printf(m, "Flip not associated with any ring\n");
-			seq_printf(m, "Flip queued on frame %d, (was ready on frame %d), now %d\n",
-				   work->flip_queued_vblank,
-				   work->flip_ready_vblank,
-				   intel_crtc_get_vblank_counter(crtc));
-			seq_printf(m, "%d prepares\n", atomic_read(&work->pending));
-
-			if (INTEL_GEN(dev_priv) >= 4)
-				addr = I915_HI_DISPBASE(I915_READ(DSPSURF(crtc->plane)));
-			else
-				addr = I915_READ(DSPADDR(crtc->plane));
-			seq_printf(m, "Current scanout address 0x%08x\n", addr);
-
-			if (work->pending_flip_obj) {
-				seq_printf(m, "New framebuffer address 0x%08lx\n", (long)work->gtt_offset);
-				seq_printf(m, "MMIO update completed? %d\n",  addr == work->gtt_offset);
-			}
-		}
-		spin_unlock_irq(&dev->event_lock);
-	}
-
-	mutex_unlock(&dev->struct_mutex);
-
-	return 0;
-}
-
 static int i915_gem_batch_pool_info(struct seq_file *m, void *data)
 {
 	struct drm_i915_private *dev_priv = node_to_i915(m->private);
@@ -4854,7 +4785,6 @@  static const struct drm_info_list i915_debugfs_list[] = {
 	{"i915_gem_gtt", i915_gem_gtt_info, 0},
 	{"i915_gem_pin_display", i915_gem_gtt_info, 0, (void *)1},
 	{"i915_gem_stolen", i915_gem_stolen_list_info },
-	{"i915_gem_pageflip", i915_gem_pageflip_info, 0},
 	{"i915_gem_request", i915_gem_request_info, 0},
 	{"i915_gem_seqno", i915_gem_seqno_info, 0},
 	{"i915_gem_fence_regs", i915_gem_fence_regs_info, 0},
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index d36ffcdbb89a..6b583dc2eb1f 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -876,7 +876,6 @@  static int i915_driver_init_early(struct drm_i915_private *dev_priv,
 	spin_lock_init(&dev_priv->uncore.lock);
 
 	spin_lock_init(&dev_priv->mm.object_stat_lock);
-	spin_lock_init(&dev_priv->mmio_flip_lock);
 	mutex_init(&dev_priv->sb_lock);
 	mutex_init(&dev_priv->modeset_restore_lock);
 	mutex_init(&dev_priv->av_mutex);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 369968539b40..9bda09a7b693 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2144,9 +2144,6 @@  struct drm_i915_private {
 	/* protects the irq masks */
 	spinlock_t irq_lock;
 
-	/* protects the mmio flip data */
-	spinlock_t mmio_flip_lock;
-
 	bool display_irqs_enabled;
 
 	/* To control wakeup latency, e.g. for irq-driven dp aux transfers. */
@@ -2251,7 +2248,6 @@  struct drm_i915_private {
 
 	struct intel_crtc *plane_to_crtc_mapping[I915_MAX_PIPES];
 	struct intel_crtc *pipe_to_crtc_mapping[I915_MAX_PIPES];
-	wait_queue_head_t pending_flip_queue;
 
 #ifdef CONFIG_DEBUG_FS
 	struct intel_pipe_crc pipe_crc[I915_MAX_PIPES];
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index d6f9b4cb6e9b..1a8842f143fc 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4936,8 +4936,6 @@  i915_gem_load_init(struct drm_i915_private *dev_priv)
 	init_waitqueue_head(&dev_priv->gpu_error.wait_queue);
 	init_waitqueue_head(&dev_priv->gpu_error.reset_queue);
 
-	init_waitqueue_head(&dev_priv->pending_flip_queue);
-
 	atomic_set(&dev_priv->mm.bsd_engine_dispatch_index, 0);
 
 	spin_lock_init(&dev_priv->fb_tracking.lock);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 343883214113..e52a2adbaaa5 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -49,11 +49,6 @@ 
 #include <linux/dma_remapping.h>
 #include <linux/reservation.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,
@@ -3557,35 +3552,6 @@  void intel_finish_reset(struct drm_i915_private *dev_priv)
 	clear_bit(I915_RESET_MODESET, &dev_priv->gpu_error.flags);
 }
 
-static bool abort_flip_on_reset(struct intel_crtc *crtc)
-{
-	struct i915_gpu_error *error = &to_i915(crtc->base.dev)->gpu_error;
-
-	if (i915_reset_backoff(error))
-		return true;
-
-	if (crtc->reset_count != i915_reset_count(error))
-		return true;
-
-	return false;
-}
-
-static bool intel_crtc_has_pending_flip(struct drm_crtc *crtc)
-{
-	struct drm_device *dev = crtc->dev;
-	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	bool pending;
-
-	if (abort_flip_on_reset(intel_crtc))
-		return false;
-
-	spin_lock_irq(&dev->event_lock);
-	pending = to_intel_crtc(crtc)->flip_work != NULL;
-	spin_unlock_irq(&dev->event_lock);
-
-	return pending;
-}
-
 static void intel_update_pipe_config(struct intel_crtc *crtc,
 				     struct intel_crtc_state *old_crtc_state)
 {
@@ -4163,57 +4129,6 @@  bool intel_has_pending_fb_unpin(struct drm_i915_private *dev_priv)
 	return false;
 }
 
-static void page_flip_completed(struct intel_crtc *intel_crtc)
-{
-	struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
-	struct intel_flip_work *work = intel_crtc->flip_work;
-
-	intel_crtc->flip_work = NULL;
-
-	if (work->event)
-		drm_crtc_send_vblank_event(&intel_crtc->base, work->event);
-
-	drm_crtc_vblank_put(&intel_crtc->base);
-
-	wake_up_all(&dev_priv->pending_flip_queue);
-	trace_i915_flip_complete(intel_crtc->plane,
-				 work->pending_flip_obj);
-
-	queue_work(dev_priv->wq, &work->unpin_work);
-}
-
-static int intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc)
-{
-	struct drm_device *dev = crtc->dev;
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	long ret;
-
-	WARN_ON(waitqueue_active(&dev_priv->pending_flip_queue));
-
-	ret = wait_event_interruptible_timeout(
-					dev_priv->pending_flip_queue,
-					!intel_crtc_has_pending_flip(crtc),
-					60*HZ);
-
-	if (ret < 0)
-		return ret;
-
-	if (ret == 0) {
-		struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-		struct intel_flip_work *work;
-
-		spin_lock_irq(&dev->event_lock);
-		work = intel_crtc->flip_work;
-		if (work && !is_mmio_work(work)) {
-			WARN_ONCE(1, "Removing stuck page flip\n");
-			page_flip_completed(intel_crtc);
-		}
-		spin_unlock_irq(&dev->event_lock);
-	}
-
-	return 0;
-}
-
 void lpt_disable_iclkip(struct drm_i915_private *dev_priv)
 {
 	u32 temp;
@@ -5824,8 +5739,6 @@  static void intel_crtc_disable_noatomic(struct drm_crtc *crtc,
 		return;
 
 	if (crtc->primary->state->visible) {
-		WARN_ON(intel_crtc->flip_work);
-
 		intel_pre_disable_primary_noatomic(crtc);
 
 		intel_crtc_disable_planes(crtc, 1 << drm_plane_index(crtc->primary));
@@ -10098,35 +10011,11 @@  struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
 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_flip_work *work;
-
-	spin_lock_irq(&dev->event_lock);
-	work = intel_crtc->flip_work;
-	intel_crtc->flip_work = NULL;
-	spin_unlock_irq(&dev->event_lock);
-
-	if (work) {
-		cancel_work_sync(&work->mmio_work);
-		cancel_work_sync(&work->unpin_work);
-		kfree(work);
-	}
 
 	drm_crtc_cleanup(crtc);
-
 	kfree(intel_crtc);
 }
 
-static inline void intel_mark_page_flip_active(struct intel_crtc *crtc,
-					       struct intel_flip_work *work)
-{
-	work->flip_queued_vblank = intel_crtc_get_vblank_counter(crtc);
-
-	/* Ensure that the work item is consistent when activating it ... */
-	smp_mb__before_atomic();
-	atomic_set(&work->pending, 1);
-}
-
 /**
  * intel_wm_need_update - Check whether watermarks need updating
  * @plane: drm plane
@@ -11945,10 +11834,6 @@  static int intel_atomic_prepare_commit(struct drm_device *dev,
 		if (state->legacy_cursor_update)
 			continue;
 
-		ret = intel_crtc_wait_for_pending_flips(crtc);
-		if (ret)
-			return ret;
-
 		if (atomic_read(&to_intel_crtc(crtc)->unpin_work_count) >= 2)
 			flush_workqueue(dev_priv->wq);
 	}
@@ -12752,7 +12637,7 @@  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, NULL);
+	intel_pipe_update_end(intel_crtc);
 }
 
 /**
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 04f80b013db9..9cb7e781e863 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -797,7 +797,6 @@  struct intel_crtc {
 	u8 plane_ids_mask;
 	unsigned long long enabled_power_domains;
 	struct intel_overlay *overlay;
-	struct intel_flip_work *flip_work;
 
 	atomic_t unpin_work_count;
 
@@ -1132,24 +1131,6 @@  intel_get_crtc_for_plane(struct drm_i915_private *dev_priv, enum plane plane)
 	return dev_priv->plane_to_crtc_mapping[plane];
 }
 
-struct intel_flip_work {
-	struct work_struct unpin_work;
-	struct work_struct mmio_work;
-
-	struct drm_crtc *crtc;
-	struct i915_vma *old_vma;
-	struct drm_framebuffer *old_fb;
-	struct drm_i915_gem_object *pending_flip_obj;
-	struct drm_pending_vblank_event *event;
-	atomic_t pending;
-	u32 flip_count;
-	u32 gtt_offset;
-	struct drm_i915_gem_request *flip_queued_req;
-	u32 flip_queued_vblank;
-	u32 flip_ready_vblank;
-	unsigned int rotation;
-};
-
 struct intel_load_detect_pipe {
 	struct drm_atomic_state *restore_state;
 };
@@ -1903,7 +1884,7 @@  struct intel_plane *intel_sprite_plane_create(struct drm_i915_private *dev_priv,
 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, struct intel_flip_work *work);
+void intel_pipe_update_end(struct intel_crtc *crtc);
 
 /* intel_tv.c */
 void intel_tv_init(struct drm_i915_private *dev_priv);
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 94f9a1332dbf..8e25694a1508 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -176,7 +176,7 @@  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, struct intel_flip_work *work)
+void intel_pipe_update_end(struct intel_crtc *crtc)
 {
 	enum pipe pipe = crtc->pipe;
 	int scanline_end = intel_get_crtc_scanline(crtc);
@@ -184,12 +184,6 @@  void intel_pipe_update_end(struct intel_crtc *crtc, struct intel_flip_work *work
 	ktime_t end_vbl_time = ktime_get();
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 
-	if (work) {
-		work->flip_queued_vblank = end_vbl_count;
-		smp_mb__before_atomic();
-		atomic_set(&work->pending, 1);
-	}
-
 	trace_i915_pipe_update_end(crtc, end_vbl_count, scanline_end);
 
 	/* We're still in the vblank-evade critical section, this can't race.