checkpoint: gtt binding written.

linux-core/drmP.h

@@ -1038,6 +1038,10 @@ extern void drm_free_pages(unsigned long address, int order, int area);
 extern DRM_AGP_MEM *drm_alloc_agp(struct drm_device *dev, int pages, u32 type);
 extern int drm_free_agp(DRM_AGP_MEM * handle, int pages);
 extern int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start);
+extern DRM_AGP_MEM *drm_agp_bind_pages(struct drm_device *dev,
+					      struct page **pages,
+					      unsigned long num_pages,
+					      uint32_t gtt_offset);
 extern int drm_unbind_agp(DRM_AGP_MEM * handle);
 
 extern void drm_free_memctl(size_t size);
@@ -1301,11 +1305,14 @@ static inline struct drm_memrange *drm_get_mm(struct drm_memrange_node *block)
 	return block->mm;
 }
 
-/* Memory manager (drm_mm.c) */
+/* Graphics Execution Manager library functions (drm_gem.c) */
 void drm_gem_object_reference(struct drm_device *dev,
 			      struct drm_gem_object *obj);
 void drm_gem_object_unreference(struct drm_device *dev,
 				struct drm_gem_object *obj);
+struct drm_gem_object *
+drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp,
+		      int handle);
 int drm_gem_alloc_ioctl(struct drm_device *dev, void *data,
 			struct drm_file *file_priv);
 int drm_gem_unreference_ioctl(struct drm_device *dev, void *data,

linux-core/drm_agpsupport.c

@@ -484,6 +484,53 @@ int drm_agp_unbind_memory(DRM_AGP_MEM * handle)
 	return agp_unbind_memory(handle);
 }
 
+/**
+ * Binds a collection of pages into AGP memory at the given offset, returning
+ * the AGP memory structure containing them.
+ *
+ * No reference is held on the pages during this time -- it is up to the
+ * caller to handle that.
+ */
+DRM_AGP_MEM *
+drm_agp_bind_pages(struct drm_device *dev,
+		       struct page **pages,
+		       unsigned long num_pages,
+		       uint32_t gtt_offset)
+{
+	struct page **cur_page, **last_page = pages + num_pages;
+	DRM_AGP_MEM *mem;
+	int ret;
+
+	DRM_DEBUG("drm_agp_populate_ttm\n");
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11)
+	mem = drm_agp_allocate_memory(num_pages, AGP_USER_MEMORY);
+#else
+	mem = drm_agp_allocate_memory(dev->agp->bridge, num_pages,
+				      AGP_USER_MEMORY);
+#endif
+	if (mem == NULL) {
+		DRM_ERROR("Failed to allocate memory for %ld pages\n",
+			  num_pages);
+		return NULL;
+	}
+
+	mem->page_count = 0;
+	for (cur_page = pages; cur_page < last_page; ++cur_page) {
+		struct page *page = *cur_page;
+
+		mem->memory[mem->page_count++] =
+		    phys_to_gart(page_to_phys(page));
+	}
+
+	mem->is_flushed = TRUE;
+	ret = drm_agp_bind_memory(mem, gtt_offset);
+	if (ret != 0) {
+		agp_free_memory(mem);
+		return NULL;
+	}
+
+	return mem;
+}
 
 
 /*

linux-core/drm_gem.c

@@ -127,7 +127,7 @@ drm_gem_handle_delete(struct drm_device *dev, struct drm_file *filp,
 }
 
 /** Returns a reference to the object named by the handle. */
-static struct drm_gem_object *
+struct drm_gem_object *
 drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp,
 		      int handle)
 {
@@ -358,6 +358,9 @@ drm_gem_object_reference(struct drm_device *dev, struct drm_gem_object *obj)
 void
 drm_gem_object_unreference(struct drm_device *dev, struct drm_gem_object *obj)
 {
+	if (obj == NULL)
+		return;
+
 	spin_lock(&obj->lock);
 	obj->refcount--;
 	spin_unlock(&obj->lock);

linux-core/i915_gem.c

@@ -49,9 +49,120 @@ i915_gem_init_ioctl(struct drm_device *dev, void *data,
 }
 
 static void
-i915_gem_evict_object(struct drm_device *dev, struct drm_gem_object *obj)
+i915_gem_object_free_page_list(struct drm_device *dev,
+			       struct drm_gem_object *obj)
 {
+	struct drm_i915_gem_object *obj_priv = obj->driver_private;
+	int page_count = obj->size / PAGE_SIZE;
+	int i;
 
+	if (obj_priv->page_list == NULL)
+		return;
+
+	/* Count how many we had successfully allocated, since release_pages()
+	 * doesn't like NULLs.
+	 */
+	for (i = 0; i < obj->size / PAGE_SIZE; i++) {
+		if (obj_priv->page_list[i] == NULL)
+			break;
+	}
+	release_pages(obj_priv->page_list, i, 0);
+
+	drm_free(obj_priv->page_list,
+		 page_count * sizeof(struct page *),
+		 DRM_MEM_DRIVER);
+	obj_priv->page_list = NULL;
+}
+
+/**
+ * Unbinds an object from the GTT aperture.
+ */
+static void
+i915_gem_object_unbind(struct drm_device *dev, struct drm_gem_object *obj)
+{
+	struct drm_i915_gem_object *obj_priv = obj->driver_private;
+
+	if (obj_priv->agp_mem != NULL) {
+		drm_unbind_agp(obj_priv->agp_mem);
+		drm_free_agp(obj_priv->agp_mem, obj->size / PAGE_SIZE);
+	}
+
+	i915_gem_object_free_page_list(dev, obj);
+
+	drm_memrange_put_block(obj_priv->gtt_space);
+}
+
+/**
+ * Finds free space in the GTT aperture and binds the object there.
+ */
+static int
+i915_gem_object_bind_to_gtt(struct drm_device *dev, struct drm_gem_object *obj)
+{
+	drm_i915_private_t *dev_priv = dev->dev_private;
+	struct drm_i915_gem_object *obj_priv = obj->driver_private;
+	struct drm_memrange_node *free_space;
+	int page_count, i;
+
+	free_space = drm_memrange_search_free(&dev_priv->mm.gtt_space,
+					      obj->size,
+					      PAGE_SIZE, 0);
+
+	obj_priv->gtt_space = drm_memrange_get_block(free_space,
+						     obj->size,
+						     PAGE_SIZE);
+
+	/* Get the list of pages out of our struct file.  They'll be pinned
+	 * at this point until we release them.
+	 */
+	page_count = obj->size / PAGE_SIZE;
+	BUG_ON(obj_priv->page_list != NULL);
+	obj_priv->page_list = drm_calloc(page_count, sizeof(struct page *),
+					 DRM_MEM_DRIVER);
+	for (i = 0; i < page_count; i++) {
+		obj_priv->page_list[i] =
+		    find_or_create_page(obj->filp->f_mapping, i, GFP_HIGHUSER);
+
+		if (obj_priv->page_list[i] == NULL) {
+			i915_gem_object_free_page_list(dev, obj);
+			return -ENOMEM;
+		}
+	}
+
+	/* Create an AGP memory structure pointing at our pages, and bind it
+	 * into the GTT.
+	 */
+	obj_priv->agp_mem = drm_agp_bind_pages(dev,
+					       obj_priv->page_list,
+					       page_count,
+					       obj_priv->gtt_offset);
+	if (obj_priv->agp_mem == NULL) {
+		i915_gem_object_free_page_list(dev, obj);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static int
+i915_gem_reloc_and_validate_object(struct drm_device *dev,
+				   struct drm_file *file_priv,
+				   struct drm_i915_gem_validate_entry *entry,
+				   struct drm_gem_object *obj)
+{
+	struct drm_i915_gem_reloc *relocs;
+	struct drm_i915_gem_object *obj_priv = obj->driver_private;
+
+	/* Walk the list of relocations and perform them if necessary. */
+	/* XXX */
+
+	/* Choose the GTT offset for our buffer and put it there. */
+	if (obj_priv->gtt_space == NULL) {
+		i915_gem_object_bind_to_gtt(dev, obj);
+		if (obj_priv->gtt_space == NULL)
+			return -ENOMEM;
+	}
+
+	return 0;
 }
 
 static int
@@ -62,7 +173,7 @@ evict_callback(struct drm_memrange_node *node, void *data)
 	struct drm_i915_gem_object *obj_priv = obj->driver_private;
 
 	if (obj_priv->pin_count == 0)
-		i915_gem_evict_object(dev, obj);
+		i915_gem_object_unbind(dev, obj);
 
 	return 0;
 }
@@ -74,6 +185,7 @@ i915_gem_execbuffer(struct drm_device *dev, void *data,
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	struct drm_i915_gem_execbuffer *args = data;
 	struct drm_i915_gem_validate_entry *validate_list;
+	struct drm_gem_object **object_list;
 	int ret, i;
 	RING_LOCALS;
 
@@ -90,34 +202,64 @@ i915_gem_execbuffer(struct drm_device *dev, void *data,
 		return ret;
 
 	/* Evict everything so we have space for sure. */
-	drm_memrange_for_each(&dev_priv->mm.gtt_space, evict_callback);
+	drm_memrange_for_each(&dev_priv->mm.gtt_space, evict_callback, dev);
 
 	/* Copy in the validate list from userland */
 	validate_list = drm_calloc(sizeof(*validate_list), args->buffer_count,
 				   DRM_MEM_DRIVER);
+	object_list = drm_calloc(sizeof(*object_list), args->buffer_count,
+				 DRM_MEM_DRIVER);
+	if (validate_list == NULL || object_list == NULL) {
+		ret = -ENOMEM;
+		goto err;
+	}
 	ret = copy_from_user(validate_list,
 			     (struct drm_i915_relocation_entry __user*)
 			     args->buffers,
 			     sizeof(*validate_list) * args->buffer_count);
-	if (ret != 0) {
-		drm_free(validate_list,
-			 sizeof(*validate_list) * args->buffer_count,
-			 DRM_MEM_DRIVER);
-		return ret;
+	if (ret != 0)
+		goto err;
+
+	/* Look up object handles and perform the relocations */
+	for (i = 0; i < args->buffer_count; i++) {
+		object_list[i] = drm_gem_object_lookup(dev, file_priv,
+						       validate_list[i].buffer_handle);
+		if (object_list[i] == NULL) {
+			ret = -EINVAL;
+			goto err;
 		}
 
-	/* Perform the relocations */
-	for (i = 0; i < args->buffer_count; i++) {
-		intel_gem_reloc_and_validate_buffer(dev, &validate_list[i]);
+		i915_gem_reloc_and_validate_object(dev, file_priv,
+						   &validate_list[i],
+						   object_list[i]);
 	}
 
 	/* Exec the batchbuffer */
 
+	/* Copy the new buffer offsets back to the user's validate list. */
+	for (i = 0; i < args->buffer_count; i++) {
+		struct drm_i915_gem_object *obj_priv =
+			object_list[i]->driver_private;
 
+		validate_list[i].buffer_offset = obj_priv->gtt_offset;
+	}
+	ret = copy_to_user(validate_list,
+			     (struct drm_i915_relocation_entry __user*)
+			     args->buffers,
+			     sizeof(*validate_list) * args->buffer_count);
+
+	/* Clean up and return */
+err:
+	if (object_list != NULL) {
+		for (i = 0; i < args->buffer_count; i++)
+			drm_gem_object_unreference(dev, object_list[i]);
+	}
+	drm_free(object_list, sizeof(*object_list) * args->buffer_count,
+		 DRM_MEM_DRIVER);
 	drm_free(validate_list, sizeof(*validate_list) * args->buffer_count,
 		 DRM_MEM_DRIVER);
 
-	return 0;
+	return ret;
 }
 
 int i915_gem_init_object(struct drm_device *dev, struct drm_gem_object *obj)

shared-core/i915_drv.h

@@ -256,7 +256,19 @@ enum intel_chip_family {
 
 /** driver private structure attached to each drm_gem_object */
 struct drm_i915_gem_object {
-	/** Current offset of the object in GTT space, if any. */
+	/** Current space allocated to this object in the GTT, if any. */
+	struct drm_memrange_node *gtt_space;
+
+	/** AGP memory structure for our GTT binding. */
+	DRM_AGP_MEM *agp_mem;
+
+	struct page **page_list;
+
+	/**
+	 * Current offset of the object in GTT space.
+	 *
+	 * This is the same as gtt_space->start
+	 */
 	uint32_t gtt_offset;
 
 	/** Boolean whether this object has a valid gtt offset. */