LXR linux/drivers/gpu/drm/vmwgfx/vmwgfx

   1// SPDX-License-Identifier: GPL-2.0 OR MIT
   2/**************************************************************************
   3 *
   4 * Copyright 2013 VMware, Inc., Palo Alto, CA., USA
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a
   7 * copy of this software and associated documentation files (the
   8 * "Software"), to deal in the Software without restriction, including
   9 * without limitation the rights to use, copy, modify, merge, publish,
  10 * distribute, sub license, and/or sell copies of the Software, and to
  11 * permit persons to whom the Software is furnished to do so, subject to
  12 * the following conditions:
  13 *
  14 * The above copyright notice and this permission notice (including the
  15 * next paragraph) shall be included in all copies or substantial portions
  16 * of the Software.
  17 *
  18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25 *
  26 **************************************************************************/
  27/*
  28 * Authors:
  29 *     Thomas Hellstrom <thellstrom@vmware.com>
  30 *
  31 */
  32
  33#include "vmwgfx_drv.h"
  34#include "ttm_object.h"
  35#include <linux/dma-buf.h>
  36
  37/*
  38 * DMA-BUF attach- and mapping methods. No need to implement
  39 * these until we have other virtual devices use them.
  40 */
  41
  42static int vmw_prime_map_attach(struct dma_buf *dma_buf,
  43                                struct dma_buf_attachment *attach)
  44{
  45        return -ENOSYS;
  46}
  47
  48static void vmw_prime_map_detach(struct dma_buf *dma_buf,
  49                                 struct dma_buf_attachment *attach)
  50{
  51}
  52
  53static struct sg_table *vmw_prime_map_dma_buf(struct dma_buf_attachment *attach,
  54                                              enum dma_data_direction dir)
  55{
  56        return ERR_PTR(-ENOSYS);
  57}
  58
  59static void vmw_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
  60                                    struct sg_table *sgb,
  61                                    enum dma_data_direction dir)
  62{
  63}
  64
  65static void *vmw_prime_dmabuf_vmap(struct dma_buf *dma_buf)
  66{
  67        return NULL;
  68}
  69
  70static void vmw_prime_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
  71{
  72}
  73
  74static void *vmw_prime_dmabuf_kmap(struct dma_buf *dma_buf,
  75                unsigned long page_num)
  76{
  77        return NULL;
  78}
  79
  80static void vmw_prime_dmabuf_kunmap(struct dma_buf *dma_buf,
  81                unsigned long page_num, void *addr)
  82{
  83
  84}
  85
  86static int vmw_prime_dmabuf_mmap(struct dma_buf *dma_buf,
  87                                 struct vm_area_struct *vma)
  88{
  89        WARN_ONCE(true, "Attempted use of dmabuf mmap. Bad.\n");
  90        return -ENOSYS;
  91}
  92
  93const struct dma_buf_ops vmw_prime_dmabuf_ops =  {
  94        .attach = vmw_prime_map_attach,
  95        .detach = vmw_prime_map_detach,
  96        .map_dma_buf = vmw_prime_map_dma_buf,
  97        .unmap_dma_buf = vmw_prime_unmap_dma_buf,
  98        .release = NULL,
  99        .map = vmw_prime_dmabuf_kmap,
 100        .unmap = vmw_prime_dmabuf_kunmap,
 101        .mmap = vmw_prime_dmabuf_mmap,
 102        .vmap = vmw_prime_dmabuf_vmap,
 103        .vunmap = vmw_prime_dmabuf_vunmap,
 104};
 105
 106int vmw_prime_fd_to_handle(struct drm_device *dev,
 107                           struct drm_file *file_priv,
 108                           int fd, u32 *handle)
 109{
 110        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 111
 112        return ttm_prime_fd_to_handle(tfile, fd, handle);
 113}
 114
 115int vmw_prime_handle_to_fd(struct drm_device *dev,
 116                           struct drm_file *file_priv,
 117                           uint32_t handle, uint32_t flags,
 118                           int *prime_fd)
 119{
 120        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 121
 122        return ttm_prime_handle_to_fd(tfile, handle, flags, prime_fd);
 123}
 124