1/*
2* Copyright (c) 2017, The Linux Foundation. All rights reserved.
3*
4* Redistribution and use in source and binary forms, with or without
5* modification, are permitted provided that the following conditions are
6* met:
7*   * Redistributions of source code must retain the above copyright
8*     notice, this list of conditions and the following disclaimer.
9*   * Redistributions in binary form must reproduce the above
10*     copyright notice, this list of conditions and the following
11*     disclaimer in the documentation and/or other materials provided
12*     with the distribution.
13*   * Neither the name of The Linux Foundation nor the names of its
14*     contributors may be used to endorse or promote products derived
15*     from this software without specific prior written permission.
16*
17* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
18* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
20* ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
21* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
24* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
26* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
27* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28*/
29
30#ifndef __DRM_MASTER_H__
31#define __DRM_MASTER_H__
32
33#include <mutex>
34
35#include "drm_logger.h"
36
37namespace drm_utils {
38
39struct DRMBuffer {
40  int fd = -1;
41  uint32_t width = 0;
42  uint32_t height = 0;
43  uint32_t drm_format = 0;
44  uint64_t drm_format_modifier = 0;
45  uint32_t stride[4] = {};
46  uint32_t offset[4] = {};
47  uint32_t num_planes = 1;
48};
49
50class DRMMaster {
51 public:
52  ~DRMMaster();
53  /* Converts from ION fd --> Prime Handle --> FB_ID.
54   * Input:
55   *   drm_buffer: A DRMBuffer obj that packages description of buffer
56   * Output:
57   *   fb_id: Pointer to store DRM framebuffer id into
58   * Returns:
59   *   ioctl error code
60   */
61  int CreateFbId(const DRMBuffer &drm_buffer, uint32_t *fb_id);
62  /* Removes the fb_id from DRM
63   * Input:
64   *   fb_id: DRM FB to be removed
65   * Returns:
66   *   ioctl error code
67   */
68  int RemoveFbId(uint32_t fb_id);
69  /* Poplulates master DRM fd
70   * Input:
71   *   fd: Pointer to store master fd into
72   */
73  void GetHandle(int *fd) { *fd = dev_fd_; }
74
75  /* Creates an instance of DRMMaster if it doesn't exist and initializes it. Threadsafe.
76   * Input:
77   *   master: Pointer to store a pointer to the instance
78   * Returns:
79   *   -ENODEV if device cannot be opened or initilization fails
80   */
81  static int GetInstance(DRMMaster **master);
82  static void DestroyInstance();
83
84 private:
85  DRMMaster() {}
86  int Init();
87
88  int dev_fd_ = -1;              // Master fd for DRM
89  static DRMMaster *s_instance;  // Singleton instance
90  static std::mutex s_lock;
91};
92
93}  // namespace drm_utils
94
95#endif  // __DRM_MASTER_H__
96