Merge tag 'v4.15-rc1' into next-seccomp

Linux 4.15-rc1

1 files changed, 175 insertions, 33 deletions

diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c
index d5b821ad06af..6c32c89a83a9 100644
--- a/drivers/gpu/drm/vc4/vc4_gem.c
+++ b/drivers/gpu/drm/vc4/vc4_gem.c
@@ -55,7 +55,7 @@ vc4_free_hang_state(struct drm_device *dev, struct vc4_hang_state *state)
 	unsigned int i;
 
 	for (i = 0; i < state->user_state.bo_count; i++)
-		drm_gem_object_unreference_unlocked(state->bo[i]);
+		drm_gem_object_put_unlocked(state->bo[i]);
 
 	kfree(state);
 }
@@ -119,7 +119,7 @@ vc4_get_hang_state_ioctl(struct drm_device *dev, void *data,
 		bo_state[i].size = vc4_bo->base.base.size;
 	}
 
-	if (copy_to_user((void __user *)(uintptr_t)get_state->bo,
+	if (copy_to_user(u64_to_user_ptr(get_state->bo),
 			 bo_state,
 			 state->bo_count * sizeof(*bo_state)))
 		ret = -EFAULT;
@@ -188,12 +188,23 @@ vc4_save_hang_state(struct drm_device *dev)
 			continue;
 
 		for (j = 0; j < exec[i]->bo_count; j++) {
-			drm_gem_object_reference(&exec[i]->bo[j]->base);
+			bo = to_vc4_bo(&exec[i]->bo[j]->base);
+
+			/* Retain BOs just in case they were marked purgeable.
+			 * This prevents the BO from being purged before
+			 * someone had a chance to dump the hang state.
+			 */
+			WARN_ON(!refcount_read(&bo->usecnt));
+			refcount_inc(&bo->usecnt);
+			drm_gem_object_get(&exec[i]->bo[j]->base);
 			kernel_state->bo[j + prev_idx] = &exec[i]->bo[j]->base;
 		}
 
 		list_for_each_entry(bo, &exec[i]->unref_list, unref_head) {
-			drm_gem_object_reference(&bo->base.base);
+			/* No need to retain BOs coming from the ->unref_list
+			 * because they are naturally unpurgeable.
+			 */
+			drm_gem_object_get(&bo->base.base);
 			kernel_state->bo[j + prev_idx] = &bo->base.base;
 			j++;
 		}
@@ -233,6 +244,26 @@ vc4_save_hang_state(struct drm_device *dev)
 	state->fdbgs = V3D_READ(V3D_FDBGS);
 	state->errstat = V3D_READ(V3D_ERRSTAT);
 
+	/* We need to turn purgeable BOs into unpurgeable ones so that
+	 * userspace has a chance to dump the hang state before the kernel
+	 * decides to purge those BOs.
+	 * Note that BO consistency at dump time cannot be guaranteed. For
+	 * example, if the owner of these BOs decides to re-use them or mark
+	 * them purgeable again there's nothing we can do to prevent it.
+	 */
+	for (i = 0; i < kernel_state->user_state.bo_count; i++) {
+		struct vc4_bo *bo = to_vc4_bo(kernel_state->bo[i]);
+
+		if (bo->madv == __VC4_MADV_NOTSUPP)
+			continue;
+
+		mutex_lock(&bo->madv_lock);
+		if (!WARN_ON(bo->madv == __VC4_MADV_PURGED))
+			bo->madv = VC4_MADV_WILLNEED;
+		refcount_dec(&bo->usecnt);
+		mutex_unlock(&bo->madv_lock);
+	}
+
 	spin_lock_irqsave(&vc4->job_lock, irqflags);
 	if (vc4->hang_state) {
 		spin_unlock_irqrestore(&vc4->job_lock, irqflags);
@@ -281,10 +312,10 @@ vc4_reset_work(struct work_struct *work)
 }
 
 static void
-vc4_hangcheck_elapsed(unsigned long data)
+vc4_hangcheck_elapsed(struct timer_list *t)
 {
-	struct drm_device *dev = (struct drm_device *)data;
-	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct vc4_dev *vc4 = from_timer(vc4, t, hangcheck.timer);
+	struct drm_device *dev = vc4->dev;
 	uint32_t ct0ca, ct1ca;
 	unsigned long irqflags;
 	struct vc4_exec_info *bin_exec, *render_exec;
@@ -639,9 +670,6 @@ vc4_queue_submit(struct drm_device *dev, struct vc4_exec_info *exec,
  * The command validator needs to reference BOs by their index within
  * the submitted job's BO list.  This does the validation of the job's
  * BO list and reference counting for the lifetime of the job.
- *
- * Note that this function doesn't need to unreference the BOs on
- * failure, because that will happen at vc4_complete_exec() time.
  */
 static int
 vc4_cl_lookup_bos(struct drm_device *dev,
@@ -659,7 +687,7 @@ vc4_cl_lookup_bos(struct drm_device *dev,
 		/* See comment on bo_index for why we have to check
 		 * this.
 		 */
-		DRM_ERROR("Rendering requires BOs to validate\n");
+		DRM_DEBUG("Rendering requires BOs to validate\n");
 		return -EINVAL;
 	}
 
@@ -678,8 +706,7 @@ vc4_cl_lookup_bos(struct drm_device *dev,
 		goto fail;
 	}
 
-	if (copy_from_user(handles,
-			   (void __user *)(uintptr_t)args->bo_handles,
+	if (copy_from_user(handles, u64_to_user_ptr(args->bo_handles),
 			   exec->bo_count * sizeof(uint32_t))) {
 		ret = -EFAULT;
 		DRM_ERROR("Failed to copy in GEM handles\n");
@@ -691,19 +718,50 @@ vc4_cl_lookup_bos(struct drm_device *dev,
 		struct drm_gem_object *bo = idr_find(&file_priv->object_idr,
 						     handles[i]);
 		if (!bo) {
-			DRM_ERROR("Failed to look up GEM BO %d: %d\n",
+			DRM_DEBUG("Failed to look up GEM BO %d: %d\n",
 				  i, handles[i]);
 			ret = -EINVAL;
-			spin_unlock(&file_priv->table_lock);
-			goto fail;
+			break;
 		}
-		drm_gem_object_reference(bo);
+
+		drm_gem_object_get(bo);
 		exec->bo[i] = (struct drm_gem_cma_object *)bo;
 	}
 	spin_unlock(&file_priv->table_lock);
 
+	if (ret)
+		goto fail_put_bo;
+
+	for (i = 0; i < exec->bo_count; i++) {
+		ret = vc4_bo_inc_usecnt(to_vc4_bo(&exec->bo[i]->base));
+		if (ret)
+			goto fail_dec_usecnt;
+	}
+
+	kvfree(handles);
+	return 0;
+
+fail_dec_usecnt:
+	/* Decrease usecnt on acquired objects.
+	 * We cannot rely on  vc4_complete_exec() to release resources here,
+	 * because vc4_complete_exec() has no information about which BO has
+	 * had its ->usecnt incremented.
+	 * To make things easier we just free everything explicitly and set
+	 * exec->bo to NULL so that vc4_complete_exec() skips the 'BO release'
+	 * step.
+	 */
+	for (i-- ; i >= 0; i--)
+		vc4_bo_dec_usecnt(to_vc4_bo(&exec->bo[i]->base));
+
+fail_put_bo:
+	/* Release any reference to acquired objects. */
+	for (i = 0; i < exec->bo_count && exec->bo[i]; i++)
+		drm_gem_object_put_unlocked(&exec->bo[i]->base);
+
 fail:
 	kvfree(handles);
+	kvfree(exec->bo);
+	exec->bo = NULL;
 	return ret;
 }
 
@@ -729,7 +787,7 @@ vc4_get_bcl(struct drm_device *dev, struct vc4_exec_info *exec)
 	    args->shader_rec_count >= (UINT_MAX /
 					  sizeof(struct vc4_shader_state)) ||
 	    temp_size < exec_size) {
-		DRM_ERROR("overflow in exec arguments\n");
+		DRM_DEBUG("overflow in exec arguments\n");
 		ret = -EINVAL;
 		goto fail;
 	}
@@ -755,27 +813,27 @@ vc4_get_bcl(struct drm_device *dev, struct vc4_exec_info *exec)
 	exec->shader_state_size = args->shader_rec_count;
 
 	if (copy_from_user(bin,
-			   (void __user *)(uintptr_t)args->bin_cl,
+			   u64_to_user_ptr(args->bin_cl),
 			   args->bin_cl_size)) {
 		ret = -EFAULT;
 		goto fail;
 	}
 
 	if (copy_from_user(exec->shader_rec_u,
-			   (void __user *)(uintptr_t)args->shader_rec,
+			   u64_to_user_ptr(args->shader_rec),
 			   args->shader_rec_size)) {
 		ret = -EFAULT;
 		goto fail;
 	}
 
 	if (copy_from_user(exec->uniforms_u,
-			   (void __user *)(uintptr_t)args->uniforms,
+			   u64_to_user_ptr(args->uniforms),
 			   args->uniforms_size)) {
 		ret = -EFAULT;
 		goto fail;
 	}
 
-	bo = vc4_bo_create(dev, exec_size, true);
+	bo = vc4_bo_create(dev, exec_size, true, VC4_BO_TYPE_BCL);
 	if (IS_ERR(bo)) {
 		DRM_ERROR("Couldn't allocate BO for binning\n");
 		ret = PTR_ERR(bo);
@@ -834,8 +892,12 @@ vc4_complete_exec(struct drm_device *dev, struct vc4_exec_info *exec)
 		dma_fence_signal(exec->fence);
 
 	if (exec->bo) {
-		for (i = 0; i < exec->bo_count; i++)
-			drm_gem_object_unreference_unlocked(&exec->bo[i]->base);
+		for (i = 0; i < exec->bo_count; i++) {
+			struct vc4_bo *bo = to_vc4_bo(&exec->bo[i]->base);
+
+			vc4_bo_dec_usecnt(bo);
+			drm_gem_object_put_unlocked(&exec->bo[i]->base);
+		}
 		kvfree(exec->bo);
 	}
 
@@ -843,7 +905,7 @@ vc4_complete_exec(struct drm_device *dev, struct vc4_exec_info *exec)
 		struct vc4_bo *bo = list_first_entry(&exec->unref_list,
 						     struct vc4_bo, unref_head);
 		list_del(&bo->unref_head);
-		drm_gem_object_unreference_unlocked(&bo->base.base);
+		drm_gem_object_put_unlocked(&bo->base.base);
 	}
 
 	/* Free up the allocation of any bin slots we used. */
@@ -974,7 +1036,7 @@ vc4_wait_bo_ioctl(struct drm_device *dev, void *data,
 
 	gem_obj = drm_gem_object_lookup(file_priv, args->handle);
 	if (!gem_obj) {
-		DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
+		DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
 		return -EINVAL;
 	}
 	bo = to_vc4_bo(gem_obj);
@@ -982,7 +1044,7 @@ vc4_wait_bo_ioctl(struct drm_device *dev, void *data,
 	ret = vc4_wait_for_seqno_ioctl_helper(dev, bo->seqno,
 					      &args->timeout_ns);
 
-	drm_gem_object_unreference_unlocked(gem_obj);
+	drm_gem_object_put_unlocked(gem_obj);
 	return ret;
 }
 
@@ -1008,8 +1070,11 @@ vc4_submit_cl_ioctl(struct drm_device *dev, void *data,
 	struct ww_acquire_ctx acquire_ctx;
 	int ret = 0;
 
-	if ((args->flags & ~VC4_SUBMIT_CL_USE_CLEAR_COLOR) != 0) {
-		DRM_ERROR("Unknown flags: 0x%02x\n", args->flags);
+	if ((args->flags & ~(VC4_SUBMIT_CL_USE_CLEAR_COLOR |
+			     VC4_SUBMIT_CL_FIXED_RCL_ORDER |
+			     VC4_SUBMIT_CL_RCL_ORDER_INCREASING_X |
+			     VC4_SUBMIT_CL_RCL_ORDER_INCREASING_Y)) != 0) {
+		DRM_DEBUG("Unknown flags: 0x%02x\n", args->flags);
 		return -EINVAL;
 	}
 
@@ -1089,13 +1154,14 @@ vc4_gem_init(struct drm_device *dev)
 	spin_lock_init(&vc4->job_lock);
 
 	INIT_WORK(&vc4->hangcheck.reset_work, vc4_reset_work);
-	setup_timer(&vc4->hangcheck.timer,
-		    vc4_hangcheck_elapsed,
-		    (unsigned long)dev);
+	timer_setup(&vc4->hangcheck.timer, vc4_hangcheck_elapsed, 0);
 
 	INIT_WORK(&vc4->job_done_work, vc4_job_done_work);
 
 	mutex_init(&vc4->power_lock);
+
+	INIT_LIST_HEAD(&vc4->purgeable.list);
+	mutex_init(&vc4->purgeable.lock);
 }
 
 void
@@ -1118,6 +1184,82 @@ vc4_gem_destroy(struct drm_device *dev)
 
 	if (vc4->hang_state)
 		vc4_free_hang_state(dev, vc4->hang_state);
+}
+
+int vc4_gem_madvise_ioctl(struct drm_device *dev, void *data,
+			  struct drm_file *file_priv)
+{
+	struct drm_vc4_gem_madvise *args = data;
+	struct drm_gem_object *gem_obj;
+	struct vc4_bo *bo;
+	int ret;
 
-	vc4_bo_cache_destroy(dev);
+	switch (args->madv) {
+	case VC4_MADV_DONTNEED:
+	case VC4_MADV_WILLNEED:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (args->pad != 0)
+		return -EINVAL;
+
+	gem_obj = drm_gem_object_lookup(file_priv, args->handle);
+	if (!gem_obj) {
+		DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
+		return -ENOENT;
+	}
+
+	bo = to_vc4_bo(gem_obj);
+
+	/* Only BOs exposed to userspace can be purged. */
+	if (bo->madv == __VC4_MADV_NOTSUPP) {
+		DRM_DEBUG("madvise not supported on this BO\n");
+		ret = -EINVAL;
+		goto out_put_gem;
+	}
+
+	/* Not sure it's safe to purge imported BOs. Let's just assume it's
+	 * not until proven otherwise.
+	 */
+	if (gem_obj->import_attach) {
+		DRM_DEBUG("madvise not supported on imported BOs\n");
+		ret = -EINVAL;
+		goto out_put_gem;
+	}
+
+	mutex_lock(&bo->madv_lock);
+
+	if (args->madv == VC4_MADV_DONTNEED && bo->madv == VC4_MADV_WILLNEED &&
+	    !refcount_read(&bo->usecnt)) {
+		/* If the BO is about to be marked as purgeable, is not used
+		 * and is not already purgeable or purged, add it to the
+		 * purgeable list.
+		 */
+		vc4_bo_add_to_purgeable_pool(bo);
+	} else if (args->madv == VC4_MADV_WILLNEED &&
+		   bo->madv == VC4_MADV_DONTNEED &&
+		   !refcount_read(&bo->usecnt)) {
+		/* The BO has not been purged yet, just remove it from
+		 * the purgeable list.
+		 */
+		vc4_bo_remove_from_purgeable_pool(bo);
+	}
+
+	/* Save the purged state. */
+	args->retained = bo->madv != __VC4_MADV_PURGED;
+
+	/* Update internal madv state only if the bo was not purged. */
+	if (bo->madv != __VC4_MADV_PURGED)
+		bo->madv = args->madv;
+
+	mutex_unlock(&bo->madv_lock);
+
+	ret = 0;
+
+out_put_gem:
+	drm_gem_object_put_unlocked(gem_obj);
+
+	return ret;
 }