drivers/gpu/drm/vmwgfx/vmwgfx_prime.c

   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 <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 dma_buf_attachment *attach)
  44 {
  45         return -ENOSYS;
  46 }
  47
  48 static void vmw_prime_map_detach(struct dma_buf *dma_buf,
  49                                  struct dma_buf_attachment *attach)
  50 {
  51 }
  52
  53 static 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
  59 static 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
  65 static void *vmw_prime_dmabuf_vmap(struct dma_buf *dma_buf)
  66 {
  67         return NULL;
  68 }
  69
  70 static void vmw_prime_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
  71 {
  72 }
  73
  74 static void *vmw_prime_dmabuf_kmap(struct dma_buf *dma_buf,
  75                 unsigned long page_num)
  76 {
  77         return NULL;
  78 }
  79
  80 static void vmw_prime_dmabuf_kunmap(struct dma_buf *dma_buf,
  81                 unsigned long page_num, void *addr)
  82 {
  83
  84 }
  85
  86 static 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
  93 const 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
 106 int 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
 115 int 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 }