drm/msm: 'struct fence' conversion

Signed-off-by: Rob Clark <[e-mail]>

drivers/gpu/drm/msm/adreno/adreno_gpu.c

···
 		OUT_PKT2(ring);
 
 	OUT_PKT0(ring, REG_AXXX_CP_SCRATCH_REG2, 1);
-	OUT_RING(ring, submit->fence);
+	OUT_RING(ring, submit->fence->seqno);
 
 	if (adreno_is_a3xx(adreno_gpu) || adreno_is_a4xx(adreno_gpu)) {
 		/* Flush HLSQ lazy updates to make sure there is nothing
···
 	OUT_PKT3(ring, CP_EVENT_WRITE, 3);
 	OUT_RING(ring, CACHE_FLUSH_TS);
 	OUT_RING(ring, rbmemptr(adreno_gpu, fence));
-	OUT_RING(ring, submit->fence);
+	OUT_RING(ring, submit->fence->seqno);
 
 	/* we could maybe be clever and only CP_COND_EXEC the interrupt: */
 	OUT_PKT3(ring, CP_INTERRUPT, 1);

drivers/gpu/drm/msm/msm_atomic.c

···
 	}
 }
 
-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.
  */
···
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_kms *kms = priv->kms;
 
-	wait_fences(c, async);
+	drm_atomic_helper_wait_for_fences(dev, state);
 
 	kms->funcs->prepare_commit(kms, state);
 
···
 		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;
 	struct msm_commit *c;
 	int i, ret;
···
 		if (!crtc)
 			continue;
 		c->crtc_mask |= (1 << drm_crtc_index(crtc));
+	}
+
+	/*
+	 * 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) {
+			struct drm_gem_object *obj = msm_framebuffer_bo(new_state->fb, 0);
+			struct msm_gem_object *msm_obj = to_msm_bo(obj);
+
+			new_state->fence = reservation_object_get_excl_rcu(msm_obj->resv);
+		}
 	}
 
 	/*

drivers/gpu/drm/msm/msm_drv.h

···
 void msm_gem_prime_unpin(struct drm_gem_object *obj);
 void *msm_gem_vaddr_locked(struct drm_gem_object *obj);
 void *msm_gem_vaddr(struct drm_gem_object *obj);
+int msm_gem_sync_object(struct drm_gem_object *obj,
+		struct msm_fence_context *fctx, bool exclusive);
 void msm_gem_move_to_active(struct drm_gem_object *obj,
-		struct msm_gpu *gpu, bool write, uint32_t fence);
+		struct msm_gpu *gpu, bool exclusive, struct fence *fence);
 void msm_gem_move_to_inactive(struct drm_gem_object *obj);
-int msm_gem_cpu_sync(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout);
 int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout);
 int msm_gem_cpu_fini(struct drm_gem_object *obj);
 void msm_gem_free_object(struct drm_gem_object *obj);

drivers/gpu/drm/msm/msm_fence.c

···
 
 	fctx->dev = dev;
 	fctx->name = name;
+	fctx->context = fence_context_alloc(1);
 	init_waitqueue_head(&fctx->event);
+	spin_lock_init(&fctx->spinlock);
 
 	return fctx;
 }
···
 	return (int32_t)(fctx->completed_fence - fence) >= 0;
 }
 
+/* legacy path for WAIT_FENCE ioctl: */
 int msm_wait_fence(struct msm_fence_context *fctx, uint32_t fence,
 		ktime_t *timeout, bool interruptible)
 {
···
 /* called from workqueue */
 void msm_update_fence(struct msm_fence_context *fctx, uint32_t fence)
 {
-	mutex_lock(&fctx->dev->struct_mutex);
+	spin_lock(&fctx->spinlock);
 	fctx->completed_fence = max(fence, fctx->completed_fence);
-	mutex_unlock(&fctx->dev->struct_mutex);
+	spin_unlock(&fctx->spinlock);
 
 	wake_up_all(&fctx->event);
+}
+
+struct msm_fence {
+	struct msm_fence_context *fctx;
+	struct fence base;
+};
+
+static inline struct msm_fence *to_msm_fence(struct fence *fence)
+{
+	return container_of(fence, struct msm_fence, base);
+}
+
+static const char *msm_fence_get_driver_name(struct fence *fence)
+{
+	return "msm";
+}
+
+static const char *msm_fence_get_timeline_name(struct fence *fence)
+{
+	struct msm_fence *f = to_msm_fence(fence);
+	return f->fctx->name;
+}
+
+static bool msm_fence_enable_signaling(struct fence *fence)
+{
+	return true;
+}
+
+static bool msm_fence_signaled(struct fence *fence)
+{
+	struct msm_fence *f = to_msm_fence(fence);
+	return fence_completed(f->fctx, f->base.seqno);
+}
+
+static void msm_fence_release(struct fence *fence)
+{
+	struct msm_fence *f = to_msm_fence(fence);
+	kfree_rcu(f, base.rcu);
+}
+
+static const struct fence_ops msm_fence_ops = {
+	.get_driver_name = msm_fence_get_driver_name,
+	.get_timeline_name = msm_fence_get_timeline_name,
+	.enable_signaling = msm_fence_enable_signaling,
+	.signaled = msm_fence_signaled,
+	.wait = fence_default_wait,
+	.release = msm_fence_release,
+};
+
+struct fence *
+msm_fence_alloc(struct msm_fence_context *fctx)
+{
+	struct msm_fence *f;
+
+	f = kzalloc(sizeof(*f), GFP_KERNEL);
+	if (!f)
+		return ERR_PTR(-ENOMEM);
+
+	f->fctx = fctx;
+
+	fence_init(&f->base, &msm_fence_ops, &fctx->spinlock,
+			fctx->context, ++fctx->last_fence);
+
+	return &f->base;
 }

drivers/gpu/drm/msm/msm_fence.h

···
 struct msm_fence_context {
 	struct drm_device *dev;
 	const char *name;
+	unsigned context;
 	/* last_fence == completed_fence --> no pending work */
 	uint32_t last_fence;          /* last assigned fence */
 	uint32_t completed_fence;     /* last completed fence */
 	wait_queue_head_t event;
+	spinlock_t spinlock;
 };
 
 struct msm_fence_context * msm_fence_context_alloc(struct drm_device *dev,
···
 int msm_queue_fence_cb(struct msm_fence_context *fctx,
 		struct msm_fence_cb *cb, uint32_t fence);
 void msm_update_fence(struct msm_fence_context *fctx, uint32_t fence);
+
+struct fence * msm_fence_alloc(struct msm_fence_context *fctx);
 
 #endif

drivers/gpu/drm/msm/msm_gem.c

···
 	return ret;
 }
 
+/* must be called before _move_to_active().. */
+int msm_gem_sync_object(struct drm_gem_object *obj,
+		struct msm_fence_context *fctx, bool exclusive)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct reservation_object_list *fobj;
+	struct fence *fence;
+	int i, ret;
+
+	if (!exclusive) {
+		/* NOTE: _reserve_shared() must happen before _add_shared_fence(),
+		 * which makes this a slightly strange place to call it.  OTOH this
+		 * is a convenient can-fail point to hook it in.  (And similar to
+		 * how etnaviv and nouveau handle this.)
+		 */
+		ret = reservation_object_reserve_shared(msm_obj->resv);
+		if (ret)
+			return ret;
+	}
+
+	fobj = reservation_object_get_list(msm_obj->resv);
+	if (!fobj || (fobj->shared_count == 0)) {
+		fence = reservation_object_get_excl(msm_obj->resv);
+		/* don't need to wait on our own fences, since ring is fifo */
+		if (fence && (fence->context != fctx->context)) {
+			ret = fence_wait(fence, true);
+			if (ret)
+				return ret;
+		}
+	}
+
+	if (!exclusive || !fobj)
+		return 0;
+
+	for (i = 0; i < fobj->shared_count; i++) {
+		fence = rcu_dereference_protected(fobj->shared[i],
+						reservation_object_held(msm_obj->resv));
+		if (fence->context != fctx->context) {
+			ret = fence_wait(fence, true);
+			if (ret)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
 void msm_gem_move_to_active(struct drm_gem_object *obj,
-		struct msm_gpu *gpu, bool write, uint32_t fence)
+		struct msm_gpu *gpu, bool exclusive, struct fence *fence)
 {
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
 	msm_obj->gpu = gpu;
-	if (write)
-		msm_obj->write_fence = fence;
+	if (exclusive)
+		reservation_object_add_excl_fence(msm_obj->resv, fence);
 	else
-		msm_obj->read_fence = fence;
+		reservation_object_add_shared_fence(msm_obj->resv, fence);
 	list_del_init(&msm_obj->mm_list);
 	list_add_tail(&msm_obj->mm_list, &gpu->active_list);
 }
···
 	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 
 	msm_obj->gpu = NULL;
-	msm_obj->read_fence = 0;
-	msm_obj->write_fence = 0;
 	list_del_init(&msm_obj->mm_list);
 	list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
 }
 
-int msm_gem_cpu_sync(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
-{
-	struct drm_device *dev = obj->dev;
-	struct msm_drm_private *priv = dev->dev_private;
-	struct msm_gem_object *msm_obj = to_msm_bo(obj);
-	int ret = 0;
-
-	if (is_active(msm_obj)) {
-		uint32_t fence = msm_gem_fence(msm_obj, op);
-
-		if (op & MSM_PREP_NOSYNC)
-			timeout = NULL;
-
-		if (priv->gpu)
-			ret = msm_wait_fence(priv->gpu->fctx, fence, timeout, true);
-	}
-
-	return ret;
-}
-
 int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
 {
-	int ret = msm_gem_cpu_sync(obj, op, timeout);
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	bool write = !!(op & MSM_PREP_WRITE);
+
+	if (op & MSM_PREP_NOSYNC) {
+		if (!reservation_object_test_signaled_rcu(msm_obj->resv, write))
+			return -EBUSY;
+	} else {
+		int ret;
+
+		ret = reservation_object_wait_timeout_rcu(msm_obj->resv, write,
+				true, timeout_to_jiffies(timeout));
+		if (ret <= 0)
+			return ret == 0 ? -ETIMEDOUT : ret;
+	}
 
 	/* TODO cache maintenance */
 
-	return ret;
+	return 0;
 }
 
 int msm_gem_cpu_fini(struct drm_gem_object *obj)
···
 }
 
 #ifdef CONFIG_DEBUG_FS
+static void describe_fence(struct fence *fence, const char *type,
+		struct seq_file *m)
+{
+	if (!fence_is_signaled(fence))
+		seq_printf(m, "\t%9s: %s %s seq %u\n", type,
+				fence->ops->get_driver_name(fence),
+				fence->ops->get_timeline_name(fence),
+				fence->seqno);
+}
+
 void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 {
-	struct drm_device *dev = obj->dev;
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct reservation_object *robj = msm_obj->resv;
+	struct reservation_object_list *fobj;
+	struct fence *fence;
 	uint64_t off = drm_vma_node_start(&obj->vma_node);
 
-	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
-	seq_printf(m, "%08x: %c(r=%u,w=%u) %2d (%2d) %08llx %p %zu\n",
+	WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
+
+	seq_printf(m, "%08x: %c %2d (%2d) %08llx %p %zu\n",
 			msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',
-			msm_obj->read_fence, msm_obj->write_fence,
 			obj->name, obj->refcount.refcount.counter,
 			off, msm_obj->vaddr, obj->size);
+
+	rcu_read_lock();
+	fobj = rcu_dereference(robj->fence);
+	if (fobj) {
+		unsigned int i, shared_count = fobj->shared_count;
+
+		for (i = 0; i < shared_count; i++) {
+			fence = rcu_dereference(fobj->shared[i]);
+			describe_fence(fence, "Shared", m);
+		}
+	}
+
+	fence = rcu_dereference(robj->fence_excl);
+	if (fence)
+		describe_fence(fence, "Exclusive", m);
+	rcu_read_unlock();
 }
 
 void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)

drivers/gpu/drm/msm/msm_gem.h

···
 	 */
 	struct list_head mm_list;
 	struct msm_gpu *gpu;     /* non-null if active */
-	uint32_t read_fence, write_fence;
 
 	/* Transiently in the process of submit ioctl, objects associated
 	 * with the submit are on submit->bo_list.. this only lasts for
···
 	return msm_obj->gpu != NULL;
 }
 
-static inline uint32_t msm_gem_fence(struct msm_gem_object *msm_obj,
-		uint32_t op)
-{
-	uint32_t fence = 0;
-
-	if (op & MSM_PREP_READ)
-		fence = msm_obj->write_fence;
-	if (op & MSM_PREP_WRITE)
-		fence = max(fence, msm_obj->read_fence);
-
-	return fence;
-}
-
 #define MAX_CMDS 4
 
 /* Created per submit-ioctl, to track bo's and cmdstream bufs, etc,
···
 	struct list_head node;   /* node in gpu submit_list */
 	struct list_head bo_list;
 	struct ww_acquire_ctx ticket;
-	uint32_t fence;
+	struct fence *fence;
 	bool valid;         /* true if no cmdstream patching needed */
 	unsigned int nr_cmds;
 	unsigned int nr_bos;

drivers/gpu/drm/msm/msm_gem_submit.c

···
 	return ret;
 }
 
+static int submit_fence_sync(struct msm_gem_submit *submit)
+{
+	int i, ret = 0;
+
+	for (i = 0; i < submit->nr_bos; i++) {
+		struct msm_gem_object *msm_obj = submit->bos[i].obj;
+		bool write = submit->bos[i].flags & MSM_SUBMIT_BO_WRITE;
+
+		ret = msm_gem_sync_object(&msm_obj->base, submit->gpu->fctx, write);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
 static int submit_pin_objects(struct msm_gem_submit *submit)
 {
 	int i, ret = 0;
···
 	if (ret)
 		goto out;
 
+	ret = submit_fence_sync(submit);
+	if (ret)
+		goto out;
+
 	ret = submit_pin_objects(submit);
 	if (ret)
 		goto out;
···
 
 	ret = msm_gpu_submit(gpu, submit, ctx);
 
-	args->fence = submit->fence;
+	args->fence = submit->fence->seqno;
 
 out:
 	submit_cleanup(submit, !!ret);

drivers/gpu/drm/msm/msm_gpu.c

···
  * Hangcheck detection for locked gpu:
  */
 
-static void retire_submits(struct msm_gpu *gpu, uint32_t fence);
+static void retire_submits(struct msm_gpu *gpu);
 
 static void recover_worker(struct work_struct *work)
 {
 	struct msm_gpu *gpu = container_of(work, struct msm_gpu, recover_work);
 	struct drm_device *dev = gpu->dev;
+	uint32_t fence = gpu->funcs->last_fence(gpu);
 
 	dev_err(dev->dev, "%s: hangcheck recover!\n", gpu->name);
+
+	msm_update_fence(gpu->fctx, fence + 1);
 
 	mutex_lock(&dev->struct_mutex);
 	if (msm_gpu_active(gpu)) {
 		struct msm_gem_submit *submit;
-		uint32_t fence = gpu->funcs->last_fence(gpu);
 
 		/* retire completed submits, plus the one that hung: */
-		retire_submits(gpu, fence + 1);
+		retire_submits(gpu);
 
 		inactive_cancel(gpu);
 		gpu->funcs->recover(gpu);
···
 		drm_gem_object_unreference(&msm_obj->base);
 	}
 
+	fence_put(submit->fence);
 	list_del(&submit->node);
 	kfree(submit);
 }
 
-static void retire_submits(struct msm_gpu *gpu, uint32_t fence)
+static void retire_submits(struct msm_gpu *gpu)
 {
 	struct drm_device *dev = gpu->dev;
 
···
 		submit = list_first_entry(&gpu->submit_list,
 				struct msm_gem_submit, node);
 
-		if (submit->fence <= fence) {
+		if (fence_is_signaled(submit->fence)) {
 			retire_submit(gpu, submit);
 		} else {
 			break;
···
 	msm_update_fence(gpu->fctx, fence);
 
 	mutex_lock(&dev->struct_mutex);
-	retire_submits(gpu, fence);
+	retire_submits(gpu);
 	mutex_unlock(&dev->struct_mutex);
 
 	if (!msm_gpu_active(gpu))
···
 
 	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 
-	submit->fence = ++gpu->fctx->last_fence;
+	submit->fence = msm_fence_alloc(gpu->fctx);
+	if (IS_ERR(submit->fence)) {
+		ret = PTR_ERR(submit->fence);
+		submit->fence = NULL;
+		return ret;
+	}
 
 	inactive_cancel(gpu);
 
···
 		msm_gem_get_iova_locked(&msm_obj->base,
 				submit->gpu->id, &iova);
 
-		if (submit->bos[i].flags & MSM_SUBMIT_BO_READ)
-			msm_gem_move_to_active(&msm_obj->base, gpu, false, submit->fence);
-
 		if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE)
 			msm_gem_move_to_active(&msm_obj->base, gpu, true, submit->fence);
+		else if (submit->bos[i].flags & MSM_SUBMIT_BO_READ)
+			msm_gem_move_to_active(&msm_obj->base, gpu, false, submit->fence);
 	}
 
 	ret = gpu->funcs->submit(gpu, submit, ctx);

drivers/gpu/drm/msm/msm_rd.c

···
 
 	n = snprintf(msg, sizeof(msg), "%.*s/%d: fence=%u",
 			TASK_COMM_LEN, current->comm, task_pid_nr(current),
-			submit->fence);
+			submit->fence->seqno);
 
 	rd_write_section(rd, RD_CMD, msg, ALIGN(n, 4));