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}