drivers/gpu/drm/virtio/virtgpu_gem.c - linux - Git at Google

 /*
  * Copyright (C) 2015 Red Hat, Inc.
  * All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
  * without limitation the rights to use, copy, modify, merge, publish,
  * distribute, sublicense, and/or sell copies of the Software, and to
  * permit persons to whom the Software is furnished to do so, subject to
  * the following conditions:
  *
  * The above copyright notice and this permission notice (including the
  * next paragraph) shall be included in all copies or substantial
  * portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */

 #include <drm/drm_file.h>
 #include <drm/drm_fourcc.h>

 #include "virtgpu_drv.h"

 static int virtio_gpu_gem_create(struct drm_file *file,
 				 struct drm_device *dev,
 				 struct virtio_gpu_object_params *params,
 				 struct drm_gem_object **obj_p,
 				 uint32_t *handle_p)
 {
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 	struct virtio_gpu_object *obj;
 	int ret;
 	u32 handle;

 	ret = virtio_gpu_object_create(vgdev, params, &obj, NULL);
 	if (ret < 0)
 		return ret;

 	ret = drm_gem_handle_create(file, &obj->base.base, &handle);
 	if (ret) {
 		drm_gem_object_release(&obj->base.base);
 		return ret;
 	}

 	*obj_p = &obj->base.base;

 	/* drop reference from allocate - handle holds it now */
 	drm_gem_object_put(&obj->base.base);

 	*handle_p = handle;
 	return 0;
 }

 int virtio_gpu_mode_dumb_create(struct drm_file *file_priv,
 				struct drm_device *dev,
 				struct drm_mode_create_dumb *args)
 {
 	struct drm_gem_object *gobj;
 	struct virtio_gpu_object_params params = { 0 };
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 	int ret;
 	uint32_t pitch;

 	if (args->bpp != 32)
 		return -EINVAL;

 	pitch = args->width * 4;
 	args->size = pitch * args->height;
 	args->size = ALIGN(args->size, PAGE_SIZE);

 	params.format = virtio_gpu_translate_format(DRM_FORMAT_HOST_XRGB8888);
 	params.width = args->width;
 	params.height = args->height;
 	params.size = args->size;
 	params.dumb = true;

 	if (vgdev->has_resource_blob && !vgdev->has_virgl_3d) {
 		params.blob_mem = VIRTGPU_BLOB_MEM_GUEST;
 		params.blob_flags = VIRTGPU_BLOB_FLAG_USE_SHAREABLE;
 		params.blob = true;
 	}

 	ret = virtio_gpu_gem_create(file_priv, dev, &params, &gobj,
 				    &args->handle);
 	if (ret)
 		goto fail;

 	args->pitch = pitch;
 	return ret;

 fail:
 	return ret;
 }

 int virtio_gpu_mode_dumb_mmap(struct drm_file *file_priv,
 			      struct drm_device *dev,
 			      uint32_t handle, uint64_t *offset_p)
 {
 	struct drm_gem_object *gobj;

 	BUG_ON(!offset_p);
 	gobj = drm_gem_object_lookup(file_priv, handle);
 	if (gobj == NULL)
 		return -ENOENT;
 	*offset_p = drm_vma_node_offset_addr(&gobj->vma_node);
 	drm_gem_object_put(gobj);
 	return 0;
 }

 int virtio_gpu_gem_object_open(struct drm_gem_object *obj,
 			       struct drm_file *file)
 {
 	struct virtio_gpu_device *vgdev = obj->dev->dev_private;
 	struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
 	struct virtio_gpu_object_array *objs;

 	if (!vgdev->has_virgl_3d)
 		goto out_notify;

 	/* the context might still be missing when the first ioctl is
 	 * DRM_IOCTL_MODE_CREATE_DUMB or DRM_IOCTL_PRIME_FD_TO_HANDLE
 	 */
 	virtio_gpu_create_context(obj->dev, file);

 	objs = virtio_gpu_array_alloc(1);
 	if (!objs)
 		return -ENOMEM;
 	virtio_gpu_array_add_obj(objs, obj);

 	virtio_gpu_cmd_context_attach_resource(vgdev, vfpriv->ctx_id,
 					       objs);
 out_notify:
 	virtio_gpu_notify(vgdev);
 	return 0;
 }

 void virtio_gpu_gem_object_close(struct drm_gem_object *obj,
 				 struct drm_file *file)
 {
 	struct virtio_gpu_device *vgdev = obj->dev->dev_private;
 	struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
 	struct virtio_gpu_object_array *objs;

 	if (!vgdev->has_virgl_3d)
 		return;

 	objs = virtio_gpu_array_alloc(1);
 	if (!objs)
 		return;
 	virtio_gpu_array_add_obj(objs, obj);

 	virtio_gpu_cmd_context_detach_resource(vgdev, vfpriv->ctx_id,
 					       objs);
 	virtio_gpu_notify(vgdev);
 }

 struct virtio_gpu_object_array *virtio_gpu_array_alloc(u32 nents)
 {
 	struct virtio_gpu_object_array *objs;

 	objs = kmalloc(struct_size(objs, objs, nents), GFP_KERNEL);
 	if (!objs)
 		return NULL;

 	objs->nents = 0;
 	objs->total = nents;
 	return objs;
 }

 static void virtio_gpu_array_free(struct virtio_gpu_object_array *objs)
 {
 	kfree(objs);
 }

 struct virtio_gpu_object_array*
 virtio_gpu_array_from_handles(struct drm_file *drm_file, u32 *handles, u32 nents)
 {
 	struct virtio_gpu_object_array *objs;
 	u32 i;

 	objs = virtio_gpu_array_alloc(nents);
 	if (!objs)
 		return NULL;

 	for (i = 0; i < nents; i++) {
 		objs->objs[i] = drm_gem_object_lookup(drm_file, handles[i]);
 		if (!objs->objs[i]) {
 			objs->nents = i;
 			virtio_gpu_array_put_free(objs);
 			return NULL;
 		}
 	}
 	objs->nents = i;
 	return objs;
 }

 void virtio_gpu_array_add_obj(struct virtio_gpu_object_array *objs,
 			      struct drm_gem_object *obj)
 {
 	if (WARN_ON_ONCE(objs->nents == objs->total))
 		return;

 	drm_gem_object_get(obj);
 	objs->objs[objs->nents] = obj;
 	objs->nents++;
 }

 int virtio_gpu_array_lock_resv(struct virtio_gpu_object_array *objs)
 {
 	unsigned int i;
 	int ret;

 	if (objs->nents == 1) {
 		ret = dma_resv_lock_interruptible(objs->objs[0]->resv, NULL);
 	} else {
 		ret = drm_gem_lock_reservations(objs->objs, objs->nents,
 						&objs->ticket);
 	}
 	if (ret)
 		return ret;

 	for (i = 0; i < objs->nents; ++i) {
 		ret = dma_resv_reserve_fences(objs->objs[i]->resv, 1);
 		if (ret)
 			return ret;
 	}
 	return ret;
 }

 void virtio_gpu_array_unlock_resv(struct virtio_gpu_object_array *objs)
 {
 	if (objs->nents == 1) {
 		dma_resv_unlock(objs->objs[0]->resv);
 	} else {
 		drm_gem_unlock_reservations(objs->objs, objs->nents,
 					    &objs->ticket);
 	}
 }

 void virtio_gpu_array_add_fence(struct virtio_gpu_object_array *objs,
 				struct dma_fence *fence)
 {
 	int i;

 	for (i = 0; i < objs->nents; i++)
 		dma_resv_add_fence(objs->objs[i]->resv, fence,
 				   DMA_RESV_USAGE_WRITE);
 }

 void virtio_gpu_array_put_free(struct virtio_gpu_object_array *objs)
 {
 	u32 i;

 	if (!objs)
 		return;

 	for (i = 0; i < objs->nents; i++)
 		drm_gem_object_put(objs->objs[i]);
 	virtio_gpu_array_free(objs);
 }

 void virtio_gpu_array_put_free_delayed(struct virtio_gpu_device *vgdev,
 				       struct virtio_gpu_object_array *objs)
 {
 	spin_lock(&vgdev->obj_free_lock);
 	list_add_tail(&objs->next, &vgdev->obj_free_list);
 	spin_unlock(&vgdev->obj_free_lock);
 	schedule_work(&vgdev->obj_free_work);
 }

 void virtio_gpu_array_put_free_work(struct work_struct *work)
 {
 	struct virtio_gpu_device *vgdev =
 		container_of(work, struct virtio_gpu_device, obj_free_work);
 	struct virtio_gpu_object_array *objs;

 	spin_lock(&vgdev->obj_free_lock);
 	while (!list_empty(&vgdev->obj_free_list)) {
 		objs = list_first_entry(&vgdev->obj_free_list,
 					struct virtio_gpu_object_array, next);
 		list_del(&objs->next);
 		spin_unlock(&vgdev->obj_free_lock);
 		virtio_gpu_array_put_free(objs);
 		spin_lock(&vgdev->obj_free_lock);
 	}
 	spin_unlock(&vgdev->obj_free_lock);
 }
	/*
	* Copyright (C) 2015 Red Hat, Inc.
	* All Rights Reserved.
	*
	* Permission is hereby granted, free of charge, to any person obtaining
	* a copy of this software and associated documentation files (the
	* "Software"), to deal in the Software without restriction, including
	* without limitation the rights to use, copy, modify, merge, publish,
	* distribute, sublicense, and/or sell copies of the Software, and to
	* permit persons to whom the Software is furnished to do so, subject to
	* the following conditions:
	*
	* The above copyright notice and this permission notice (including the
	* next paragraph) shall be included in all copies or substantial
	* portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
	* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
	* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
	* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
	* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	*/

	#include <drm/drm_file.h>
	#include <drm/drm_fourcc.h>

	#include "virtgpu_drv.h"

	static int virtio_gpu_gem_create(struct drm_file *file,
	struct drm_device *dev,
	struct virtio_gpu_object_params *params,
	struct drm_gem_object **obj_p,
	uint32_t *handle_p)
	{
	struct virtio_gpu_device *vgdev = dev->dev_private;
	struct virtio_gpu_object *obj;
	int ret;
	u32 handle;

	ret = virtio_gpu_object_create(vgdev, params, &obj, NULL);
	if (ret < 0)
	return ret;

	ret = drm_gem_handle_create(file, &obj->base.base, &handle);
	if (ret) {
	drm_gem_object_release(&obj->base.base);
	return ret;
	}

	*obj_p = &obj->base.base;

	/* drop reference from allocate - handle holds it now */
	drm_gem_object_put(&obj->base.base);

	*handle_p = handle;
	return 0;
	}

	int virtio_gpu_mode_dumb_create(struct drm_file *file_priv,
	struct drm_device *dev,
	struct drm_mode_create_dumb *args)
	{
	struct drm_gem_object *gobj;
	struct virtio_gpu_object_params params = { 0 };
	struct virtio_gpu_device *vgdev = dev->dev_private;
	int ret;
	uint32_t pitch;

	if (args->bpp != 32)
	return -EINVAL;

	pitch = args->width * 4;
	args->size = pitch * args->height;
	args->size = ALIGN(args->size, PAGE_SIZE);

	params.format = virtio_gpu_translate_format(DRM_FORMAT_HOST_XRGB8888);
	params.width = args->width;
	params.height = args->height;
	params.size = args->size;
	params.dumb = true;

	if (vgdev->has_resource_blob && !vgdev->has_virgl_3d) {
	params.blob_mem = VIRTGPU_BLOB_MEM_GUEST;
	params.blob_flags = VIRTGPU_BLOB_FLAG_USE_SHAREABLE;
	params.blob = true;
	}

	ret = virtio_gpu_gem_create(file_priv, dev, &params, &gobj,
	&args->handle);
	if (ret)
	goto fail;

	args->pitch = pitch;
	return ret;

	fail:
	return ret;
	}

	int virtio_gpu_mode_dumb_mmap(struct drm_file *file_priv,
	struct drm_device *dev,
	uint32_t handle, uint64_t *offset_p)
	{
	struct drm_gem_object *gobj;

	BUG_ON(!offset_p);
	gobj = drm_gem_object_lookup(file_priv, handle);
	if (gobj == NULL)
	return -ENOENT;
	*offset_p = drm_vma_node_offset_addr(&gobj->vma_node);
	drm_gem_object_put(gobj);
	return 0;
	}

	int virtio_gpu_gem_object_open(struct drm_gem_object *obj,
	struct drm_file *file)
	{
	struct virtio_gpu_device *vgdev = obj->dev->dev_private;
	struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
	struct virtio_gpu_object_array *objs;

	if (!vgdev->has_virgl_3d)
	goto out_notify;

	/* the context might still be missing when the first ioctl is
	* DRM_IOCTL_MODE_CREATE_DUMB or DRM_IOCTL_PRIME_FD_TO_HANDLE
	*/
	virtio_gpu_create_context(obj->dev, file);

	objs = virtio_gpu_array_alloc(1);
	if (!objs)
	return -ENOMEM;
	virtio_gpu_array_add_obj(objs, obj);

	virtio_gpu_cmd_context_attach_resource(vgdev, vfpriv->ctx_id,
	objs);
	out_notify:
	virtio_gpu_notify(vgdev);
	return 0;
	}

	void virtio_gpu_gem_object_close(struct drm_gem_object *obj,
	struct drm_file *file)
	{
	struct virtio_gpu_device *vgdev = obj->dev->dev_private;
	struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
	struct virtio_gpu_object_array *objs;

	if (!vgdev->has_virgl_3d)
	return;

	objs = virtio_gpu_array_alloc(1);
	if (!objs)
	return;
	virtio_gpu_array_add_obj(objs, obj);

	virtio_gpu_cmd_context_detach_resource(vgdev, vfpriv->ctx_id,
	objs);
	virtio_gpu_notify(vgdev);
	}

	struct virtio_gpu_object_array *virtio_gpu_array_alloc(u32 nents)
	{
	struct virtio_gpu_object_array *objs;

	objs = kmalloc(struct_size(objs, objs, nents), GFP_KERNEL);
	if (!objs)
	return NULL;

	objs->nents = 0;
	objs->total = nents;
	return objs;
	}

	static void virtio_gpu_array_free(struct virtio_gpu_object_array *objs)
	{
	kfree(objs);
	}

	struct virtio_gpu_object_array*
	virtio_gpu_array_from_handles(struct drm_file drm_file, u32 handles, u32 nents)
	{
	struct virtio_gpu_object_array *objs;
	u32 i;

	objs = virtio_gpu_array_alloc(nents);
	if (!objs)
	return NULL;

	for (i = 0; i < nents; i++) {
	objs->objs[i] = drm_gem_object_lookup(drm_file, handles[i]);
	if (!objs->objs[i]) {
	objs->nents = i;
	virtio_gpu_array_put_free(objs);
	return NULL;
	}
	}
	objs->nents = i;
	return objs;
	}

	void virtio_gpu_array_add_obj(struct virtio_gpu_object_array *objs,
	struct drm_gem_object *obj)
	{
	if (WARN_ON_ONCE(objs->nents == objs->total))
	return;

	drm_gem_object_get(obj);
	objs->objs[objs->nents] = obj;
	objs->nents++;
	}

	int virtio_gpu_array_lock_resv(struct virtio_gpu_object_array *objs)
	{
	unsigned int i;
	int ret;

	if (objs->nents == 1) {
	ret = dma_resv_lock_interruptible(objs->objs[0]->resv, NULL);
	} else {
	ret = drm_gem_lock_reservations(objs->objs, objs->nents,
	&objs->ticket);
	}
	if (ret)
	return ret;

	for (i = 0; i < objs->nents; ++i) {
	ret = dma_resv_reserve_fences(objs->objs[i]->resv, 1);
	if (ret)
	return ret;
	}
	return ret;
	}

	void virtio_gpu_array_unlock_resv(struct virtio_gpu_object_array *objs)
	{
	if (objs->nents == 1) {
	dma_resv_unlock(objs->objs[0]->resv);
	} else {
	drm_gem_unlock_reservations(objs->objs, objs->nents,
	&objs->ticket);
	}
	}

	void virtio_gpu_array_add_fence(struct virtio_gpu_object_array *objs,
	struct dma_fence *fence)
	{
	int i;

	for (i = 0; i < objs->nents; i++)
	dma_resv_add_fence(objs->objs[i]->resv, fence,
	DMA_RESV_USAGE_WRITE);
	}

	void virtio_gpu_array_put_free(struct virtio_gpu_object_array *objs)
	{
	u32 i;

	if (!objs)
	return;

	for (i = 0; i < objs->nents; i++)
	drm_gem_object_put(objs->objs[i]);
	virtio_gpu_array_free(objs);
	}

	void virtio_gpu_array_put_free_delayed(struct virtio_gpu_device *vgdev,
	struct virtio_gpu_object_array *objs)
	{
	spin_lock(&vgdev->obj_free_lock);
	list_add_tail(&objs->next, &vgdev->obj_free_list);
	spin_unlock(&vgdev->obj_free_lock);
	schedule_work(&vgdev->obj_free_work);
	}

	void virtio_gpu_array_put_free_work(struct work_struct *work)
	{
	struct virtio_gpu_device *vgdev =
	container_of(work, struct virtio_gpu_device, obj_free_work);
	struct virtio_gpu_object_array *objs;

	spin_lock(&vgdev->obj_free_lock);
	while (!list_empty(&vgdev->obj_free_list)) {
	objs = list_first_entry(&vgdev->obj_free_list,
	struct virtio_gpu_object_array, next);
	list_del(&objs->next);
	spin_unlock(&vgdev->obj_free_lock);
	virtio_gpu_array_put_free(objs);
	spin_lock(&vgdev->obj_free_lock);
	}
	spin_unlock(&vgdev->obj_free_lock);
	}