drivers/gpu/drm/vmwgfx/vmwgfx_prime.c

   1 /**************************************************************************
   2  *
   3  * Copyright © 2013 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   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 <linux/dma-buf.h>
  35 #include <drm/ttm/ttm_object.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
  42 static int vmw_prime_map_attach(struct dma_buf *dma_buf,
  43                                 struct device *target_dev,
  44                                 struct dma_buf_attachment *attach)
  45 {
  46         return -ENOSYS;
  47 }
  48
  49 static void vmw_prime_map_detach(struct dma_buf *dma_buf,
  50                                  struct dma_buf_attachment *attach)
  51 {
  52 }
  53
  54 static struct sg_table *vmw_prime_map_dma_buf(struct dma_buf_attachment *attach,
  55                                               enum dma_data_direction dir)
  56 {
  57         return ERR_PTR(-ENOSYS);
  58 }
  59
  60 static void vmw_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
  61                                     struct sg_table *sgb,
  62                                     enum dma_data_direction dir)
  63 {
  64 }
  65
  66 static void *vmw_prime_dmabuf_vmap(struct dma_buf *dma_buf)
  67 {
  68         return NULL;
  69 }
  70
  71 static void vmw_prime_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
  72 {
  73 }
  74
  75 static void *vmw_prime_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
  76                 unsigned long page_num)
  77 {
  78         return NULL;
  79 }
  80
  81 static void vmw_prime_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
  82                 unsigned long page_num, void *addr)
  83 {
  84
  85 }
  86 static void *vmw_prime_dmabuf_kmap(struct dma_buf *dma_buf,
  87                 unsigned long page_num)
  88 {
  89         return NULL;
  90 }
  91
  92 static void vmw_prime_dmabuf_kunmap(struct dma_buf *dma_buf,
  93                 unsigned long page_num, void *addr)
  94 {
  95
  96 }
  97
  98 static int vmw_prime_dmabuf_mmap(struct dma_buf *dma_buf,
  99                                  struct vm_area_struct *vma)
 100 {
 101         WARN_ONCE(true, "Attempted use of dmabuf mmap. Bad.\n");
 102         return -ENOSYS;
 103 }
 104
 105 const struct dma_buf_ops vmw_prime_dmabuf_ops =  {
 106         .attach = vmw_prime_map_attach,
 107         .detach = vmw_prime_map_detach,
 108         .map_dma_buf = vmw_prime_map_dma_buf,
 109         .unmap_dma_buf = vmw_prime_unmap_dma_buf,
 110         .release = NULL,
 111         .map = vmw_prime_dmabuf_kmap,
 112         .map_atomic = vmw_prime_dmabuf_kmap_atomic,
 113         .unmap = vmw_prime_dmabuf_kunmap,
 114         .unmap_atomic = vmw_prime_dmabuf_kunmap_atomic,
 115         .mmap = vmw_prime_dmabuf_mmap,
 116         .vmap = vmw_prime_dmabuf_vmap,
 117         .vunmap = vmw_prime_dmabuf_vunmap,
 118 };
 119
 120 int vmw_prime_fd_to_handle(struct drm_device *dev,
 121                            struct drm_file *file_priv,
 122                            int fd, u32 *handle)
 123 {
 124         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 125
 126         return ttm_prime_fd_to_handle(tfile, fd, handle);
 127 }
 128
 129 int vmw_prime_handle_to_fd(struct drm_device *dev,
 130                            struct drm_file *file_priv,
 131                            uint32_t handle, uint32_t flags,
 132                            int *prime_fd)
 133 {
 134         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 135
 136         return ttm_prime_handle_to_fd(tfile, handle, flags, prime_fd);
 137 }