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 37 namespace drm_utils { 38 39 struct 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 50 class 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 *gem_handle, 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 gem_handle, uint32_t fb_id); 69 /* Poplulates master DRM fd 70 * Input: 71 * fd: Pointer to store master fd into 72 */ GetHandle(int * fd)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: DRMMaster()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