drm/i915: Mark CPU cache as dirty on every transition for CPU writes

Currently, we only mark the CPU cache as dirty if we skip a clflush.
This leads to some confusion where we have to ask if the object is in
the write domain or missed a clflush. If we always mark the cache as
dirty, this becomes a much simply question to answer.

The goal remains to do as few clflushes as required and to do them as
late as possible, in the hope of deferring the work to a kthread and not
block the caller (e.g. execbuf, flips).

v2: Always call clflush before GPU execution when the cache_dirty flag
is set. This may cause some extra work on llc systems that migrate dirty
buffers back and forth - but we do try to limit that by only setting
cache_dirty at the end of the gpu sequence.

v3: Always mark the cache as dirty upon a level change, as we need to
invalidate any stale cachelines due to external writes.
Reported-by: Dongwon Kim <dongwon.kim@intel.com>
Fixes: a6a7cc4b ("drm/i915: Always flush the dirty CPU cache when pinning the scanout")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Dongwon Kim <dongwon.kim@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Tested-by: Dongwon Kim <dongwon.kim@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170615123850.26843-1-chris@chris-wilson.co.ukReviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

drivers/gpu/drm/i915/i915_gem.c

@@ -49,7 +49,7 @@ static void i915_gem_flush_free_objects(struct drm_i915_private *i915);
 
 static bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
 {
-	if (obj->base.write_domain == I915_GEM_DOMAIN_CPU)
+	if (obj->cache_dirty)
 		return false;
 
 	if (!i915_gem_object_is_coherent(obj))
@@ -233,6 +233,14 @@ i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
 	return st;
 }
 
+static void __start_cpu_write(struct drm_i915_gem_object *obj)
+{
+	obj->base.read_domains = I915_GEM_DOMAIN_CPU;
+	obj->base.write_domain = I915_GEM_DOMAIN_CPU;
+	if (cpu_write_needs_clflush(obj))
+		obj->cache_dirty = true;
+}
+
 static void
 __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
 				struct sg_table *pages,
@@ -248,8 +256,7 @@ __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
 	    !i915_gem_object_is_coherent(obj))
 		drm_clflush_sg(pages);
 
-	obj->base.read_domains = I915_GEM_DOMAIN_CPU;
-	obj->base.write_domain = I915_GEM_DOMAIN_CPU;
+	__start_cpu_write(obj);
 }
 
 static void
@@ -684,6 +691,12 @@ i915_gem_dumb_create(struct drm_file *file,
 			       args->size, &args->handle);
 }
 
+static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj)
+{
+	return !(obj->cache_level == I915_CACHE_NONE ||
+		 obj->cache_level == I915_CACHE_WT);
+}
+
 /**
  * Creates a new mm object and returns a handle to it.
  * @dev: drm device pointer
@@ -753,6 +766,11 @@ flush_write_domain(struct drm_i915_gem_object *obj, unsigned int flush_domains)
 	case I915_GEM_DOMAIN_CPU:
 		i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
 		break;
+
+	case I915_GEM_DOMAIN_RENDER:
+		if (gpu_write_needs_clflush(obj))
+			obj->cache_dirty = true;
+		break;
 	}
 
 	obj->base.write_domain = 0;
@@ -854,7 +872,8 @@ int i915_gem_obj_prepare_shmem_read(struct drm_i915_gem_object *obj,
 	 * optimizes for the case when the gpu will dirty the data
 	 * anyway again before the next pread happens.
 	 */
-	if (!(obj->base.read_domains & I915_GEM_DOMAIN_CPU))
+	if (!obj->cache_dirty &&
+	    !(obj->base.read_domains & I915_GEM_DOMAIN_CPU))
 		*needs_clflush = CLFLUSH_BEFORE;
 
 out:
@@ -906,14 +925,16 @@ int i915_gem_obj_prepare_shmem_write(struct drm_i915_gem_object *obj,
 	 * This optimizes for the case when the gpu will use the data
 	 * right away and we therefore have to clflush anyway.
 	 */
-	if (obj->base.write_domain != I915_GEM_DOMAIN_CPU)
+	if (!obj->cache_dirty) {
 		*needs_clflush |= CLFLUSH_AFTER;
 
-	/* Same trick applies to invalidate partially written cachelines read
-	 * before writing.
+		/*
+		 * Same trick applies to invalidate partially written
+		 * cachelines read before writing.
 		 */
 		if (!(obj->base.read_domains & I915_GEM_DOMAIN_CPU))
 			*needs_clflush |= CLFLUSH_BEFORE;
+	}
 
 out:
 	intel_fb_obj_invalidate(obj, ORIGIN_CPU);
@@ -3395,9 +3416,12 @@ int i915_gem_wait_for_idle(struct drm_i915_private *i915, unsigned int flags)
 
 static void __i915_gem_object_flush_for_display(struct drm_i915_gem_object *obj)
 {
-	if (obj->base.write_domain != I915_GEM_DOMAIN_CPU && !obj->cache_dirty)
-		return;
-
+	/*
+	 * We manually flush the CPU domain so that we can override and
+	 * force the flush for the display, and perform it asyncrhonously.
+	 */
+	flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
+	if (obj->cache_dirty)
 		i915_gem_clflush_object(obj, I915_CLFLUSH_FORCE);
 	obj->base.write_domain = 0;
 }
@@ -3657,13 +3681,10 @@ int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
 		}
 	}
 
-	if (obj->base.write_domain == I915_GEM_DOMAIN_CPU &&
-	    i915_gem_object_is_coherent(obj))
-		obj->cache_dirty = true;
-
 	list_for_each_entry(vma, &obj->vma_list, obj_link)
 		vma->node.color = cache_level;
 	obj->cache_level = cache_level;
+	obj->cache_dirty = true; /* Always invalidate stale cachelines */
 
 	return 0;
 }
@@ -3885,9 +3906,6 @@ i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write)
 	if (ret)
 		return ret;
 
-	if (obj->base.write_domain == I915_GEM_DOMAIN_CPU)
-		return 0;
-
 	flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
 
 	/* Flush the CPU cache if it's still invalid. */
@@ -3899,15 +3917,13 @@ i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write)
 	/* It should now be out of any other write domains, and we can update
 	 * the domain values for our changes.
 	 */
-	GEM_BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_CPU) != 0);
+	GEM_BUG_ON(obj->base.write_domain & ~I915_GEM_DOMAIN_CPU);
 
 	/* If we're writing through the CPU, then the GPU read domains will
 	 * need to be invalidated at next use.
 	 */
-	if (write) {
-		obj->base.read_domains = I915_GEM_DOMAIN_CPU;
-		obj->base.write_domain = I915_GEM_DOMAIN_CPU;
-	}
+	if (write)
+		__start_cpu_write(obj);
 
 	return 0;
 }
@@ -4328,6 +4344,8 @@ i915_gem_object_create(struct drm_i915_private *dev_priv, u64 size)
 	} else
 		obj->cache_level = I915_CACHE_NONE;
 
+	obj->cache_dirty = !i915_gem_object_is_coherent(obj);
+
 	trace_i915_gem_object_create(obj);
 
 	return obj;
@@ -4994,10 +5012,8 @@ int i915_gem_freeze_late(struct drm_i915_private *dev_priv)
 
 	mutex_lock(&dev_priv->drm.struct_mutex);
 	for (p = phases; *p; p++) {
-		list_for_each_entry(obj, *p, global_link) {
-			obj->base.read_domains = I915_GEM_DOMAIN_CPU;
-			obj->base.write_domain = I915_GEM_DOMAIN_CPU;
-		}
+		list_for_each_entry(obj, *p, global_link)
+			__start_cpu_write(obj);
 	}
 	mutex_unlock(&dev_priv->drm.struct_mutex);
 

drivers/gpu/drm/i915/i915_gem_clflush.c

@@ -71,8 +71,6 @@ static const struct dma_fence_ops i915_clflush_ops = {
 static void __i915_do_clflush(struct drm_i915_gem_object *obj)
 {
 	drm_clflush_sg(obj->mm.pages);
-	obj->cache_dirty = false;
-
 	intel_fb_obj_flush(obj, ORIGIN_CPU);
 }
 
@@ -81,9 +79,6 @@ static void i915_clflush_work(struct work_struct *work)
 	struct clflush *clflush = container_of(work, typeof(*clflush), work);
 	struct drm_i915_gem_object *obj = clflush->obj;
 
-	if (!obj->cache_dirty)
-		goto out;
-
 	if (i915_gem_object_pin_pages(obj)) {
 		DRM_ERROR("Failed to acquire obj->pages for clflushing\n");
 		goto out;
@@ -131,10 +126,10 @@ void i915_gem_clflush_object(struct drm_i915_gem_object *obj,
 	 * anything not backed by physical memory we consider to be always
 	 * coherent and not need clflushing.
 	 */
-	if (!i915_gem_object_has_struct_page(obj))
+	if (!i915_gem_object_has_struct_page(obj)) {
+		obj->cache_dirty = false;
 		return;
-
-	obj->cache_dirty = true;
+	}
 
 	/* If the GPU is snooping the contents of the CPU cache,
 	 * we do not need to manually clear the CPU cache lines.  However,
@@ -153,6 +148,8 @@ void i915_gem_clflush_object(struct drm_i915_gem_object *obj,
 	if (!(flags & I915_CLFLUSH_SYNC))
 		clflush = kmalloc(sizeof(*clflush), GFP_KERNEL);
 	if (clflush) {
+		GEM_BUG_ON(!obj->cache_dirty);
+
 		dma_fence_init(&clflush->dma,
 			       &i915_clflush_ops,
 			       &clflush_lock,
@@ -180,4 +177,6 @@ void i915_gem_clflush_object(struct drm_i915_gem_object *obj,
 	} else {
 		GEM_BUG_ON(obj->base.write_domain != I915_GEM_DOMAIN_CPU);
 	}
+
+	obj->cache_dirty = false;
 }

drivers/gpu/drm/i915/i915_gem_execbuffer.c

@@ -309,7 +309,7 @@ static inline int use_cpu_reloc(struct drm_i915_gem_object *obj)
 		return DBG_USE_CPU_RELOC > 0;
 
 	return (HAS_LLC(to_i915(obj->base.dev)) ||
-		obj->base.write_domain == I915_GEM_DOMAIN_CPU ||
+		obj->cache_dirty ||
 		obj->cache_level != I915_CACHE_NONE);
 }
 
@@ -1110,10 +1110,8 @@ eb_move_to_gpu(struct i915_execbuffer *eb)
 		if (vma->exec_entry->flags & EXEC_OBJECT_ASYNC)
 			continue;
 
-		if (obj->base.write_domain & I915_GEM_DOMAIN_CPU) {
+		if (obj->cache_dirty)
 			i915_gem_clflush_object(obj, 0);
-			obj->base.write_domain = 0;
-		}
 
 		ret = i915_gem_request_await_object
 			(eb->request, obj, obj->base.pending_write_domain);
@@ -1248,12 +1246,6 @@ static int eb_select_context(struct i915_execbuffer *eb)
 	return 0;
 }
 
-static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj)
-{
-	return !(obj->cache_level == I915_CACHE_NONE ||
-		 obj->cache_level == I915_CACHE_WT);
-}
-
 void i915_vma_move_to_active(struct i915_vma *vma,
 			     struct drm_i915_gem_request *req,
 			     unsigned int flags)
@@ -1277,15 +1269,16 @@ void i915_vma_move_to_active(struct i915_vma *vma,
 	i915_gem_active_set(&vma->last_read[idx], req);
 	list_move_tail(&vma->vm_link, &vma->vm->active_list);
 
+	obj->base.write_domain = 0;
 	if (flags & EXEC_OBJECT_WRITE) {
+		obj->base.write_domain = I915_GEM_DOMAIN_RENDER;
+
 		if (intel_fb_obj_invalidate(obj, ORIGIN_CS))
 			i915_gem_active_set(&obj->frontbuffer_write, req);
 
-		/* update for the implicit flush after a batch */
-		obj->base.write_domain &= ~I915_GEM_GPU_DOMAINS;
-		if (!obj->cache_dirty && gpu_write_needs_clflush(obj))
-			obj->cache_dirty = true;
+		obj->base.read_domains = 0;
 	}
+	obj->base.read_domains |= I915_GEM_GPU_DOMAINS;
 
 	if (flags & EXEC_OBJECT_NEEDS_FENCE)
 		i915_gem_active_set(&vma->last_fence, req);

drivers/gpu/drm/i915/i915_gem_internal.c

@@ -188,9 +188,10 @@ i915_gem_object_create_internal(struct drm_i915_private *i915,
 	drm_gem_private_object_init(&i915->drm, &obj->base, size);
 	i915_gem_object_init(obj, &i915_gem_object_internal_ops);
 
-	obj->base.write_domain = I915_GEM_DOMAIN_CPU;
 	obj->base.read_domains = I915_GEM_DOMAIN_CPU;
+	obj->base.write_domain = I915_GEM_DOMAIN_CPU;
 	obj->cache_level = HAS_LLC(i915) ? I915_CACHE_LLC : I915_CACHE_NONE;
+	obj->cache_dirty = !i915_gem_object_is_coherent(obj);
 
 	return obj;
 }

drivers/gpu/drm/i915/i915_gem_userptr.c

@@ -802,9 +802,10 @@ i915_gem_userptr_ioctl(struct drm_device *dev, void *data, struct drm_file *file
 
 	drm_gem_private_object_init(dev, &obj->base, args->user_size);
 	i915_gem_object_init(obj, &i915_gem_userptr_ops);
-	obj->cache_level = I915_CACHE_LLC;
-	obj->base.write_domain = I915_GEM_DOMAIN_CPU;
 	obj->base.read_domains = I915_GEM_DOMAIN_CPU;
+	obj->base.write_domain = I915_GEM_DOMAIN_CPU;
+	obj->cache_level = I915_CACHE_LLC;
+	obj->cache_dirty = !i915_gem_object_is_coherent(obj);
 
 	obj->userptr.ptr = args->user_ptr;
 	obj->userptr.read_only = !!(args->flags & I915_USERPTR_READ_ONLY);

drivers/gpu/drm/i915/selftests/huge_gem_object.c

@@ -126,9 +126,10 @@ huge_gem_object(struct drm_i915_private *i915,
 	drm_gem_private_object_init(&i915->drm, &obj->base, dma_size);
 	i915_gem_object_init(obj, &huge_ops);
 
-	obj->base.write_domain = I915_GEM_DOMAIN_CPU;
 	obj->base.read_domains = I915_GEM_DOMAIN_CPU;
+	obj->base.write_domain = I915_GEM_DOMAIN_CPU;
 	obj->cache_level = HAS_LLC(i915) ? I915_CACHE_LLC : I915_CACHE_NONE;
+	obj->cache_dirty = !i915_gem_object_is_coherent(obj);
 	obj->scratch = phys_size;
 
 	return obj;