drivers/gpu/drm/i915/gem/i915_gem_create.c - linux - Git at Google

 // SPDX-License-Identifier: MIT
 /*
  * Copyright © 2020 Intel Corporation
  */

 #include "gem/i915_gem_ioctls.h"
 #include "gem/i915_gem_lmem.h"
 #include "gem/i915_gem_region.h"
 #include "pxp/intel_pxp.h"

 #include "i915_drv.h"
 #include "i915_trace.h"
 #include "i915_user_extensions.h"

 static u32 object_max_page_size(struct intel_memory_region **placements,
 				unsigned int n_placements)
 {
 	u32 max_page_size = 0;
 	int i;

 	for (i = 0; i < n_placements; i++) {
 		struct intel_memory_region *mr = placements[i];

 		GEM_BUG_ON(!is_power_of_2(mr->min_page_size));
 		max_page_size = max_t(u32, max_page_size, mr->min_page_size);
 	}

 	GEM_BUG_ON(!max_page_size);
 	return max_page_size;
 }

 static int object_set_placements(struct drm_i915_gem_object *obj,
 				 struct intel_memory_region **placements,
 				 unsigned int n_placements)
 {
 	struct intel_memory_region **arr;
 	unsigned int i;

 	GEM_BUG_ON(!n_placements);

 	/*
 	 * For the common case of one memory region, skip storing an
 	 * allocated array and just point at the region directly.
 	 */
 	if (n_placements == 1) {
 		struct intel_memory_region *mr = placements[0];
 		struct drm_i915_private *i915 = mr->i915;

 		obj->mm.placements = &i915->mm.regions[mr->id];
 		obj->mm.n_placements = 1;
 	} else {
 		arr = kmalloc_array(n_placements,
 				    sizeof(struct intel_memory_region *),
 				    GFP_KERNEL);
 		if (!arr)
 			return -ENOMEM;

 		for (i = 0; i < n_placements; i++)
 			arr[i] = placements[i];

 		obj->mm.placements = arr;
 		obj->mm.n_placements = n_placements;
 	}

 	return 0;
 }

 static int i915_gem_publish(struct drm_i915_gem_object *obj,
 			    struct drm_file *file,
 			    u64 *size_p,
 			    u32 *handle_p)
 {
 	u64 size = obj->base.size;
 	int ret;

 	ret = drm_gem_handle_create(file, &obj->base, handle_p);
 	/* drop reference from allocate - handle holds it now */
 	i915_gem_object_put(obj);
 	if (ret)
 		return ret;

 	*size_p = size;
 	return 0;
 }

 static struct drm_i915_gem_object *
 __i915_gem_object_create_user_ext(struct drm_i915_private *i915, u64 size,
 				  struct intel_memory_region **placements,
 				  unsigned int n_placements,
 				  unsigned int ext_flags)
 {
 	struct intel_memory_region *mr = placements[0];
 	struct drm_i915_gem_object *obj;
 	unsigned int flags;
 	int ret;

 	i915_gem_flush_free_objects(i915);

 	size = round_up(size, object_max_page_size(placements, n_placements));
 	if (size == 0)
 		return ERR_PTR(-EINVAL);

 	/* For most of the ABI (e.g. mmap) we think in system pages */
 	GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE));

 	if (i915_gem_object_size_2big(size))
 		return ERR_PTR(-E2BIG);

 	obj = i915_gem_object_alloc();
 	if (!obj)
 		return ERR_PTR(-ENOMEM);

 	ret = object_set_placements(obj, placements, n_placements);
 	if (ret)
 		goto object_free;

 	/*
 	 * I915_BO_ALLOC_USER will make sure the object is cleared before
 	 * any user access.
 	 */
 	flags = I915_BO_ALLOC_USER;

 	ret = mr->ops->init_object(mr, obj, size, 0, flags);
 	if (ret)
 		goto object_free;

 	GEM_BUG_ON(size != obj->base.size);

 	/* Add any flag set by create_ext options */
 	obj->flags |= ext_flags;

 	trace_i915_gem_object_create(obj);
 	return obj;

 object_free:
 	if (obj->mm.n_placements > 1)
 		kfree(obj->mm.placements);
 	i915_gem_object_free(obj);
 	return ERR_PTR(ret);
 }

 /**
  * Creates a new object using the same path as DRM_I915_GEM_CREATE_EXT
  * @i915: i915 private
  * @size: size of the buffer, in bytes
  * @placements: possible placement regions, in priority order
  * @n_placements: number of possible placement regions
  *
  * This function is exposed primarily for selftests and does very little
  * error checking.  It is assumed that the set of placement regions has
  * already been verified to be valid.
  */
 struct drm_i915_gem_object *
 __i915_gem_object_create_user(struct drm_i915_private *i915, u64 size,
 			      struct intel_memory_region **placements,
 			      unsigned int n_placements)
 {
 	return __i915_gem_object_create_user_ext(i915, size, placements,
 						 n_placements, 0);
 }

 int
 i915_gem_dumb_create(struct drm_file *file,
 		     struct drm_device *dev,
 		     struct drm_mode_create_dumb *args)
 {
 	struct drm_i915_gem_object *obj;
 	struct intel_memory_region *mr;
 	enum intel_memory_type mem_type;
 	int cpp = DIV_ROUND_UP(args->bpp, 8);
 	u32 format;

 	switch (cpp) {
 	case 1:
 		format = DRM_FORMAT_C8;
 		break;
 	case 2:
 		format = DRM_FORMAT_RGB565;
 		break;
 	case 4:
 		format = DRM_FORMAT_XRGB8888;
 		break;
 	default:
 		return -EINVAL;
 	}

 	/* have to work out size/pitch and return them */
 	args->pitch = ALIGN(args->width * cpp, 64);

 	/* align stride to page size so that we can remap */
 	if (args->pitch > intel_plane_fb_max_stride(to_i915(dev), format,
 						    DRM_FORMAT_MOD_LINEAR))
 		args->pitch = ALIGN(args->pitch, 4096);

 	if (args->pitch < args->width)
 		return -EINVAL;

 	args->size = mul_u32_u32(args->pitch, args->height);

 	mem_type = INTEL_MEMORY_SYSTEM;
 	if (HAS_LMEM(to_i915(dev)))
 		mem_type = INTEL_MEMORY_LOCAL;

 	mr = intel_memory_region_by_type(to_i915(dev), mem_type);

 	obj = __i915_gem_object_create_user(to_i915(dev), args->size, &mr, 1);
 	if (IS_ERR(obj))
 		return PTR_ERR(obj);

 	return i915_gem_publish(obj, file, &args->size, &args->handle);
 }

 /**
  * Creates a new mm object and returns a handle to it.
  * @dev: drm device pointer
  * @data: ioctl data blob
  * @file: drm file pointer
  */
 int
 i915_gem_create_ioctl(struct drm_device *dev, void *data,
 		      struct drm_file *file)
 {
 	struct drm_i915_private *i915 = to_i915(dev);
 	struct drm_i915_gem_create *args = data;
 	struct drm_i915_gem_object *obj;
 	struct intel_memory_region *mr;

 	mr = intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM);

 	obj = __i915_gem_object_create_user(i915, args->size, &mr, 1);
 	if (IS_ERR(obj))
 		return PTR_ERR(obj);

 	return i915_gem_publish(obj, file, &args->size, &args->handle);
 }

 struct create_ext {
 	struct drm_i915_private *i915;
 	struct intel_memory_region *placements[INTEL_REGION_UNKNOWN];
 	unsigned int n_placements;
 	unsigned long flags;
 };

 static void repr_placements(char *buf, size_t size,
 			    struct intel_memory_region **placements,
 			    int n_placements)
 {
 	int i;

 	buf[0] = '\0';

 	for (i = 0; i < n_placements; i++) {
 		struct intel_memory_region *mr = placements[i];
 		int r;

 		r = snprintf(buf, size, "\n  %s -> { class: %d, inst: %d }",
 			     mr->name, mr->type, mr->instance);
 		if (r >= size)
 			return;

 		buf += r;
 		size -= r;
 	}
 }

 static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args,
 			  struct create_ext *ext_data)
 {
 	struct drm_i915_private *i915 = ext_data->i915;
 	struct drm_i915_gem_memory_class_instance __user *uregions =
 		u64_to_user_ptr(args->regions);
 	struct intel_memory_region *placements[INTEL_REGION_UNKNOWN];
 	u32 mask;
 	int i, ret = 0;

 	if (args->pad) {
 		drm_dbg(&i915->drm, "pad should be zero\n");
 		ret = -EINVAL;
 	}

 	if (!args->num_regions) {
 		drm_dbg(&i915->drm, "num_regions is zero\n");
 		ret = -EINVAL;
 	}

 	BUILD_BUG_ON(ARRAY_SIZE(i915->mm.regions) != ARRAY_SIZE(placements));
 	BUILD_BUG_ON(ARRAY_SIZE(ext_data->placements) != ARRAY_SIZE(placements));
 	if (args->num_regions > ARRAY_SIZE(i915->mm.regions)) {
 		drm_dbg(&i915->drm, "num_regions is too large\n");
 		ret = -EINVAL;
 	}

 	if (ret)
 		return ret;

 	mask = 0;
 	for (i = 0; i < args->num_regions; i++) {
 		struct drm_i915_gem_memory_class_instance region;
 		struct intel_memory_region *mr;

 		if (copy_from_user(&region, uregions, sizeof(region)))
 			return -EFAULT;

 		mr = intel_memory_region_lookup(i915,
 						region.memory_class,
 						region.memory_instance);
 		if (!mr || mr->private) {
 			drm_dbg(&i915->drm, "Device is missing region { class: %d, inst: %d } at index = %d\n",
 				region.memory_class, region.memory_instance, i);
 			ret = -EINVAL;
 			goto out_dump;
 		}

 		if (mask & BIT(mr->id)) {
 			drm_dbg(&i915->drm, "Found duplicate placement %s -> { class: %d, inst: %d } at index = %d\n",
 				mr->name, region.memory_class,
 				region.memory_instance, i);
 			ret = -EINVAL;
 			goto out_dump;
 		}

 		placements[i] = mr;
 		mask |= BIT(mr->id);

 		++uregions;
 	}

 	if (ext_data->n_placements) {
 		ret = -EINVAL;
 		goto out_dump;
 	}

 	ext_data->n_placements = args->num_regions;
 	for (i = 0; i < args->num_regions; i++)
 		ext_data->placements[i] = placements[i];

 	return 0;

 out_dump:
 	if (1) {
 		char buf[256];

 		if (ext_data->n_placements) {
 			repr_placements(buf,
 					sizeof(buf),
 					ext_data->placements,
 					ext_data->n_placements);
 			drm_dbg(&i915->drm,
 				"Placements were already set in previous EXT. Existing placements: %s\n",
 				buf);
 		}

 		repr_placements(buf, sizeof(buf), placements, i);
 		drm_dbg(&i915->drm, "New placements(so far validated): %s\n", buf);
 	}

 	return ret;
 }

 static int ext_set_placements(struct i915_user_extension __user *base,
 			      void *data)
 {
 	struct drm_i915_gem_create_ext_memory_regions ext;

 	if (copy_from_user(&ext, base, sizeof(ext)))
 		return -EFAULT;

 	return set_placements(&ext, data);
 }

 static int ext_set_protected(struct i915_user_extension __user *base, void *data)
 {
 	struct drm_i915_gem_create_ext_protected_content ext;
 	struct create_ext *ext_data = data;

 	if (copy_from_user(&ext, base, sizeof(ext)))
 		return -EFAULT;

 	if (ext.flags)
 		return -EINVAL;

 	if (!intel_pxp_is_enabled(&ext_data->i915->gt.pxp))
 		return -ENODEV;

 	ext_data->flags |= I915_BO_PROTECTED;

 	return 0;
 }

 static const i915_user_extension_fn create_extensions[] = {
 	[I915_GEM_CREATE_EXT_MEMORY_REGIONS] = ext_set_placements,
 	[I915_GEM_CREATE_EXT_PROTECTED_CONTENT] = ext_set_protected,
 };

 /**
  * Creates a new mm object and returns a handle to it.
  * @dev: drm device pointer
  * @data: ioctl data blob
  * @file: drm file pointer
  */
 int
 i915_gem_create_ext_ioctl(struct drm_device *dev, void *data,
 			  struct drm_file *file)
 {
 	struct drm_i915_private *i915 = to_i915(dev);
 	struct drm_i915_gem_create_ext *args = data;
 	struct create_ext ext_data = { .i915 = i915 };
 	struct drm_i915_gem_object *obj;
 	int ret;

 	if (args->flags)
 		return -EINVAL;

 	ret = i915_user_extensions(u64_to_user_ptr(args->extensions),
 				   create_extensions,
 				   ARRAY_SIZE(create_extensions),
 				   &ext_data);
 	if (ret)
 		return ret;

 	if (!ext_data.n_placements) {
 		ext_data.placements[0] =
 			intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM);
 		ext_data.n_placements = 1;
 	}

 	obj = __i915_gem_object_create_user_ext(i915, args->size,
 						ext_data.placements,
 						ext_data.n_placements,
 						ext_data.flags);
 	if (IS_ERR(obj))
 		return PTR_ERR(obj);

 	return i915_gem_publish(obj, file, &args->size, &args->handle);
 }
	// SPDX-License-Identifier: MIT
	/*
	* Copyright © 2020 Intel Corporation
	*/

	#include "gem/i915_gem_ioctls.h"
	#include "gem/i915_gem_lmem.h"
	#include "gem/i915_gem_region.h"
	#include "pxp/intel_pxp.h"

	#include "i915_drv.h"
	#include "i915_trace.h"
	#include "i915_user_extensions.h"

	static u32 object_max_page_size(struct intel_memory_region **placements,
	unsigned int n_placements)
	{
	u32 max_page_size = 0;
	int i;

	for (i = 0; i < n_placements; i++) {
	struct intel_memory_region *mr = placements[i];

	GEM_BUG_ON(!is_power_of_2(mr->min_page_size));
	max_page_size = max_t(u32, max_page_size, mr->min_page_size);
	}

	GEM_BUG_ON(!max_page_size);
	return max_page_size;
	}

	static int object_set_placements(struct drm_i915_gem_object *obj,
	struct intel_memory_region **placements,
	unsigned int n_placements)
	{
	struct intel_memory_region **arr;
	unsigned int i;

	GEM_BUG_ON(!n_placements);

	/*
	* For the common case of one memory region, skip storing an
	* allocated array and just point at the region directly.
	*/
	if (n_placements == 1) {
	struct intel_memory_region *mr = placements[0];
	struct drm_i915_private *i915 = mr->i915;

	obj->mm.placements = &i915->mm.regions[mr->id];
	obj->mm.n_placements = 1;
	} else {
	arr = kmalloc_array(n_placements,
	sizeof(struct intel_memory_region *),
	GFP_KERNEL);
	if (!arr)
	return -ENOMEM;

	for (i = 0; i < n_placements; i++)
	arr[i] = placements[i];

	obj->mm.placements = arr;
	obj->mm.n_placements = n_placements;
	}

	return 0;
	}

	static int i915_gem_publish(struct drm_i915_gem_object *obj,
	struct drm_file *file,
	u64 *size_p,
	u32 *handle_p)
	{
	u64 size = obj->base.size;
	int ret;

	ret = drm_gem_handle_create(file, &obj->base, handle_p);
	/* drop reference from allocate - handle holds it now */
	i915_gem_object_put(obj);
	if (ret)
	return ret;

	*size_p = size;
	return 0;
	}

	static struct drm_i915_gem_object *
	__i915_gem_object_create_user_ext(struct drm_i915_private *i915, u64 size,
	struct intel_memory_region **placements,
	unsigned int n_placements,
	unsigned int ext_flags)
	{
	struct intel_memory_region *mr = placements[0];
	struct drm_i915_gem_object *obj;
	unsigned int flags;
	int ret;

	i915_gem_flush_free_objects(i915);

	size = round_up(size, object_max_page_size(placements, n_placements));
	if (size == 0)
	return ERR_PTR(-EINVAL);

	/* For most of the ABI (e.g. mmap) we think in system pages */
	GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE));

	if (i915_gem_object_size_2big(size))
	return ERR_PTR(-E2BIG);

	obj = i915_gem_object_alloc();
	if (!obj)
	return ERR_PTR(-ENOMEM);

	ret = object_set_placements(obj, placements, n_placements);
	if (ret)
	goto object_free;

	/*
	* I915_BO_ALLOC_USER will make sure the object is cleared before
	* any user access.
	*/
	flags = I915_BO_ALLOC_USER;

	ret = mr->ops->init_object(mr, obj, size, 0, flags);
	if (ret)
	goto object_free;

	GEM_BUG_ON(size != obj->base.size);

	/* Add any flag set by create_ext options */
	obj->flags \|= ext_flags;

	trace_i915_gem_object_create(obj);
	return obj;

	object_free:
	if (obj->mm.n_placements > 1)
	kfree(obj->mm.placements);
	i915_gem_object_free(obj);
	return ERR_PTR(ret);
	}

	/**
	* Creates a new object using the same path as DRM_I915_GEM_CREATE_EXT
	* @i915: i915 private
	* @size: size of the buffer, in bytes
	* @placements: possible placement regions, in priority order
	* @n_placements: number of possible placement regions
	*
	* This function is exposed primarily for selftests and does very little
	* error checking. It is assumed that the set of placement regions has
	* already been verified to be valid.
	*/
	struct drm_i915_gem_object *
	__i915_gem_object_create_user(struct drm_i915_private *i915, u64 size,
	struct intel_memory_region **placements,
	unsigned int n_placements)
	{
	return __i915_gem_object_create_user_ext(i915, size, placements,
	n_placements, 0);
	}

	int
	i915_gem_dumb_create(struct drm_file *file,
	struct drm_device *dev,
	struct drm_mode_create_dumb *args)
	{
	struct drm_i915_gem_object *obj;
	struct intel_memory_region *mr;
	enum intel_memory_type mem_type;
	int cpp = DIV_ROUND_UP(args->bpp, 8);
	u32 format;

	switch (cpp) {
	case 1:
	format = DRM_FORMAT_C8;
	break;
	case 2:
	format = DRM_FORMAT_RGB565;
	break;
	case 4:
	format = DRM_FORMAT_XRGB8888;
	break;
	default:
	return -EINVAL;
	}

	/* have to work out size/pitch and return them */
	args->pitch = ALIGN(args->width * cpp, 64);

	/* align stride to page size so that we can remap */
	if (args->pitch > intel_plane_fb_max_stride(to_i915(dev), format,
	DRM_FORMAT_MOD_LINEAR))
	args->pitch = ALIGN(args->pitch, 4096);

	if (args->pitch < args->width)
	return -EINVAL;

	args->size = mul_u32_u32(args->pitch, args->height);

	mem_type = INTEL_MEMORY_SYSTEM;
	if (HAS_LMEM(to_i915(dev)))
	mem_type = INTEL_MEMORY_LOCAL;

	mr = intel_memory_region_by_type(to_i915(dev), mem_type);

	obj = __i915_gem_object_create_user(to_i915(dev), args->size, &mr, 1);
	if (IS_ERR(obj))
	return PTR_ERR(obj);

	return i915_gem_publish(obj, file, &args->size, &args->handle);
	}

	/**
	* Creates a new mm object and returns a handle to it.
	* @dev: drm device pointer
	* @data: ioctl data blob
	* @file: drm file pointer
	*/
	int
	i915_gem_create_ioctl(struct drm_device dev, void data,
	struct drm_file *file)
	{
	struct drm_i915_private *i915 = to_i915(dev);
	struct drm_i915_gem_create *args = data;
	struct drm_i915_gem_object *obj;
	struct intel_memory_region *mr;

	mr = intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM);

	obj = __i915_gem_object_create_user(i915, args->size, &mr, 1);
	if (IS_ERR(obj))
	return PTR_ERR(obj);

	return i915_gem_publish(obj, file, &args->size, &args->handle);
	}

	struct create_ext {
	struct drm_i915_private *i915;
	struct intel_memory_region *placements[INTEL_REGION_UNKNOWN];
	unsigned int n_placements;
	unsigned long flags;
	};

	static void repr_placements(char *buf, size_t size,
	struct intel_memory_region **placements,
	int n_placements)
	{
	int i;

	buf[0] = '\0';

	for (i = 0; i < n_placements; i++) {
	struct intel_memory_region *mr = placements[i];
	int r;

	r = snprintf(buf, size, "\n %s -> { class: %d, inst: %d }",
	mr->name, mr->type, mr->instance);
	if (r >= size)
	return;

	buf += r;
	size -= r;
	}
	}

	static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args,
	struct create_ext *ext_data)
	{
	struct drm_i915_private *i915 = ext_data->i915;
	struct drm_i915_gem_memory_class_instance __user *uregions =
	u64_to_user_ptr(args->regions);
	struct intel_memory_region *placements[INTEL_REGION_UNKNOWN];
	u32 mask;
	int i, ret = 0;

	if (args->pad) {
	drm_dbg(&i915->drm, "pad should be zero\n");
	ret = -EINVAL;
	}

	if (!args->num_regions) {
	drm_dbg(&i915->drm, "num_regions is zero\n");
	ret = -EINVAL;
	}

	BUILD_BUG_ON(ARRAY_SIZE(i915->mm.regions) != ARRAY_SIZE(placements));
	BUILD_BUG_ON(ARRAY_SIZE(ext_data->placements) != ARRAY_SIZE(placements));
	if (args->num_regions > ARRAY_SIZE(i915->mm.regions)) {
	drm_dbg(&i915->drm, "num_regions is too large\n");
	ret = -EINVAL;
	}

	if (ret)
	return ret;

	mask = 0;
	for (i = 0; i < args->num_regions; i++) {
	struct drm_i915_gem_memory_class_instance region;
	struct intel_memory_region *mr;

	if (copy_from_user(&region, uregions, sizeof(region)))
	return -EFAULT;

	mr = intel_memory_region_lookup(i915,
	region.memory_class,
	region.memory_instance);
	if (!mr \|\| mr->private) {
	drm_dbg(&i915->drm, "Device is missing region { class: %d, inst: %d } at index = %d\n",
	region.memory_class, region.memory_instance, i);
	ret = -EINVAL;
	goto out_dump;
	}

	if (mask & BIT(mr->id)) {
	drm_dbg(&i915->drm, "Found duplicate placement %s -> { class: %d, inst: %d } at index = %d\n",
	mr->name, region.memory_class,
	region.memory_instance, i);
	ret = -EINVAL;
	goto out_dump;
	}

	placements[i] = mr;
	mask \|= BIT(mr->id);

	++uregions;
	}

	if (ext_data->n_placements) {
	ret = -EINVAL;
	goto out_dump;
	}

	ext_data->n_placements = args->num_regions;
	for (i = 0; i < args->num_regions; i++)
	ext_data->placements[i] = placements[i];

	return 0;

	out_dump:
	if (1) {
	char buf[256];

	if (ext_data->n_placements) {
	repr_placements(buf,
	sizeof(buf),
	ext_data->placements,
	ext_data->n_placements);
	drm_dbg(&i915->drm,
	"Placements were already set in previous EXT. Existing placements: %s\n",
	buf);
	}

	repr_placements(buf, sizeof(buf), placements, i);
	drm_dbg(&i915->drm, "New placements(so far validated): %s\n", buf);
	}

	return ret;
	}

	static int ext_set_placements(struct i915_user_extension __user *base,
	void *data)
	{
	struct drm_i915_gem_create_ext_memory_regions ext;

	if (copy_from_user(&ext, base, sizeof(ext)))
	return -EFAULT;

	return set_placements(&ext, data);
	}

	static int ext_set_protected(struct i915_user_extension __user base, void data)
	{
	struct drm_i915_gem_create_ext_protected_content ext;
	struct create_ext *ext_data = data;

	if (copy_from_user(&ext, base, sizeof(ext)))
	return -EFAULT;

	if (ext.flags)
	return -EINVAL;

	if (!intel_pxp_is_enabled(&ext_data->i915->gt.pxp))
	return -ENODEV;

	ext_data->flags \|= I915_BO_PROTECTED;

	return 0;
	}

	static const i915_user_extension_fn create_extensions[] = {
	[I915_GEM_CREATE_EXT_MEMORY_REGIONS] = ext_set_placements,
	[I915_GEM_CREATE_EXT_PROTECTED_CONTENT] = ext_set_protected,
	};

	/**
	* Creates a new mm object and returns a handle to it.
	* @dev: drm device pointer
	* @data: ioctl data blob
	* @file: drm file pointer
	*/
	int
	i915_gem_create_ext_ioctl(struct drm_device dev, void data,
	struct drm_file *file)
	{
	struct drm_i915_private *i915 = to_i915(dev);
	struct drm_i915_gem_create_ext *args = data;
	struct create_ext ext_data = { .i915 = i915 };
	struct drm_i915_gem_object *obj;
	int ret;

	if (args->flags)
	return -EINVAL;

	ret = i915_user_extensions(u64_to_user_ptr(args->extensions),
	create_extensions,
	ARRAY_SIZE(create_extensions),
	&ext_data);
	if (ret)
	return ret;

	if (!ext_data.n_placements) {
	ext_data.placements[0] =
	intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM);
	ext_data.n_placements = 1;
	}

	obj = __i915_gem_object_create_user_ext(i915, args->size,
	ext_data.placements,
	ext_data.n_placements,
	ext_data.flags);
	if (IS_ERR(obj))
	return PTR_ERR(obj);

	return i915_gem_publish(obj, file, &args->size, &args->handle);
	}