drm/msm: remove fence_cbs

This was only used for atomic commit these days.  So instead just give
atomic it's own work-queue where we can do a block on each bo in turn.
Simplifies things a whole bunch and makes the 'struct fence' conversion
easier.

Signed-off-by: Rob Clark <robdclark@gmail.com>

1 files changed, 32 insertions, 45 deletions

diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index a2a3d9f25b7b..6ac7192d0ad6 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -18,18 +18,16 @@
 #include "msm_drv.h"
 #include "msm_kms.h"
 #include "msm_gem.h"
-#include "msm_gpu.h"   /* temporary */
 #include "msm_fence.h"
 
 struct msm_commit {
 	struct drm_device *dev;
 	struct drm_atomic_state *state;
-	uint32_t fence;
-	struct msm_fence_cb fence_cb;
+	struct work_struct work;
 	uint32_t crtc_mask;
 };
 
-static void fence_cb(struct msm_fence_cb *cb);
+static void commit_worker(struct work_struct *work);
 
 /* block until specified crtcs are no longer pending update, and
  * atomically mark them as pending update
@@ -71,11 +69,7 @@ static struct msm_commit *commit_init(struct drm_atomic_state *state)
 	c->dev = state->dev;
 	c->state = state;
 
-	/* TODO we might need a way to indicate to run the cb on a
-	 * different wq so wait_for_vblanks() doesn't block retiring
-	 * bo's..
-	 */
-	INIT_FENCE_CB(&c->fence_cb, fence_cb);
+	INIT_WORK(&c->work, commit_worker);
 
 	return c;
 }
@@ -113,16 +107,39 @@ static void msm_atomic_wait_for_commit_done(struct drm_device *dev,
 	}
 }
 
+static void wait_fences(struct msm_commit *c, bool async)
+{
+	int nplanes = c->dev->mode_config.num_total_plane;
+	ktime_t timeout = ktime_add_ms(ktime_get(), 1000);
+	int i;
+
+	for (i = 0; i < nplanes; i++) {
+		struct drm_plane *plane = c->state->planes[i];
+		struct drm_plane_state *new_state = c->state->plane_states[i];
+
+		if (!plane)
+			continue;
+
+		if ((plane->state->fb != new_state->fb) && new_state->fb) {
+			struct drm_gem_object *obj =
+				msm_framebuffer_bo(new_state->fb, 0);
+			msm_gem_cpu_sync(obj, MSM_PREP_READ, &timeout);
+		}
+	}
+}
+
 /* The (potentially) asynchronous part of the commit.  At this point
  * nothing can fail short of armageddon.
  */
-static void complete_commit(struct msm_commit *c)
+static void complete_commit(struct msm_commit *c, bool async)
 {
 	struct drm_atomic_state *state = c->state;
 	struct drm_device *dev = state->dev;
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_kms *kms = priv->kms;
 
+	wait_fences(c, async);
+
 	kms->funcs->prepare_commit(kms, state);
 
 	drm_atomic_helper_commit_modeset_disables(dev, state);
@@ -155,17 +172,9 @@ static void complete_commit(struct msm_commit *c)
 	commit_destroy(c);
 }
 
-static void fence_cb(struct msm_fence_cb *cb)
+static void commit_worker(struct work_struct *work)
 {
-	struct msm_commit *c =
-			container_of(cb, struct msm_commit, fence_cb);
-	complete_commit(c);
-}
-
-static void add_fb(struct msm_commit *c, struct drm_framebuffer *fb)
-{
-	struct drm_gem_object *obj = msm_framebuffer_bo(fb, 0);
-	c->fence = max(c->fence, msm_gem_fence(to_msm_bo(obj), MSM_PREP_READ));
+	complete_commit(container_of(work, struct msm_commit, work), true);
 }
 
 int msm_atomic_check(struct drm_device *dev,
@@ -204,9 +213,7 @@ int msm_atomic_commit(struct drm_device *dev,
 		struct drm_atomic_state *state, bool nonblock)
 {
 	struct msm_drm_private *priv = dev->dev_private;
-	int nplanes = dev->mode_config.num_total_plane;
 	int ncrtcs = dev->mode_config.num_crtc;
-	ktime_t timeout;
 	struct msm_commit *c;
 	int i, ret;
 
@@ -231,20 +238,6 @@ int msm_atomic_commit(struct drm_device *dev,
 	}
 
 	/*
-	 * Figure out what fence to wait for:
-	 */
-	for (i = 0; i < nplanes; i++) {
-		struct drm_plane *plane = state->planes[i];
-		struct drm_plane_state *new_state = state->plane_states[i];
-
-		if (!plane)
-			continue;
-
-		if ((plane->state->fb != new_state->fb) && new_state->fb)
-			add_fb(c, new_state->fb);
-	}
-
-	/*
 	 * Wait for pending updates on any of the same crtc's and then
 	 * mark our set of crtc's as busy:
 	 */
@@ -278,18 +271,12 @@ int msm_atomic_commit(struct drm_device *dev,
 	 * current layout.
 	 */
 
-	if (nonblock && priv->gpu) {
-		msm_queue_fence_cb(priv->gpu->fctx, &c->fence_cb, c->fence);
+	if (nonblock) {
+		queue_work(priv->atomic_wq, &c->work);
 		return 0;
 	}
 
-	timeout = ktime_add_ms(ktime_get(), 1000);
-
-	/* uninterruptible wait */
-	if (priv->gpu)
-		msm_wait_fence(priv->gpu->fctx, c->fence, &timeout, false);
-
-	complete_commit(c);
+	complete_commit(c, false);
 
 	return 0;