path: root/drivers/gpu/drm/virtio/virtgpu_vq.c

/*
 * Copyright (C) 2015 Red Hat, Inc.
 * All Rights Reserved.
 *
 * Authors:
 *    Dave Airlie <airlied@redhat.com>
 *    Gerd Hoffmann <kraxel@redhat.com>
 *
 * 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
 * VA LINUX SYSTEMS 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 <linux/dma-mapping.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/virtio_ring.h>

#include <drm/drm_edid.h>

#include "virtgpu_drv.h"
#include "virtgpu_trace.h"

#define MAX_INLINE_CMD_SIZE   96
#define MAX_INLINE_RESP_SIZE  24
#define VBUFFER_SIZE          (sizeof(struct virtio_gpu_vbuffer) \
			       + MAX_INLINE_CMD_SIZE		 \
			       + MAX_INLINE_RESP_SIZE)

static void convert_to_hw_box(struct virtio_gpu_box *dst,
			      const struct drm_virtgpu_3d_box *src)
{
	dst->x = cpu_to_le32(src->x);
	dst->y = cpu_to_le32(src->y);
	dst->z = cpu_to_le32(src->z);
	dst->w = cpu_to_le32(src->w);
	dst->h = cpu_to_le32(src->h);
	dst->d = cpu_to_le32(src->d);
}

void virtio_gpu_ctrl_ack(struct virtqueue *vq)
{
	struct drm_device *dev = vq->vdev->priv;
	struct virtio_gpu_device *vgdev = dev->dev_private;

	schedule_work(&vgdev->ctrlq.dequeue_work);
}

void virtio_gpu_cursor_ack(struct virtqueue *vq)
{
	struct drm_device *dev = vq->vdev->priv;
	struct virtio_gpu_device *vgdev = dev->dev_private;

	schedule_work(&vgdev->cursorq.dequeue_work);
}

int virtio_gpu_alloc_vbufs(struct virtio_gpu_device *vgdev)
{
	vgdev->vbufs = kmem_cache_create("virtio-gpu-vbufs",
					 VBUFFER_SIZE,
					 __alignof__(struct virtio_gpu_vbuffer),
					 0, NULL);
	if (!vgdev->vbufs)
		return -ENOMEM;
	return 0;
}

void virtio_gpu_free_vbufs(struct virtio_gpu_device *vgdev)
{
	kmem_cache_destroy(vgdev->vbufs);
	vgdev->vbufs = NULL;
}

static struct virtio_gpu_vbuffer*
virtio_gpu_get_vbuf(struct virtio_gpu_device *vgdev,
		    int size, int resp_size, void *resp_buf,
		    virtio_gpu_resp_cb resp_cb)
{
	struct virtio_gpu_vbuffer *vbuf;

	vbuf = kmem_cache_zalloc(vgdev->vbufs, GFP_KERNEL | __GFP_NOFAIL);

	BUG_ON(size > MAX_INLINE_CMD_SIZE ||
	       size < sizeof(struct virtio_gpu_ctrl_hdr));
	vbuf->buf = (void *)vbuf + sizeof(*vbuf);
	vbuf->size = size;

	vbuf->resp_cb = resp_cb;
	vbuf->resp_size