1 /* 2 * Copyright © 2016 Collabora Ltd. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 */ 22 #ifndef __DRM_DEBUGFS_CRC_H__ 23 #define __DRM_DEBUGFS_CRC_H__ 24 25 #include <linux/spinlock_types.h> 26 #include <linux/types.h> 27 #include <linux/wait.h> 28 29 struct drm_crtc; 30 31 #define DRM_MAX_CRC_NR 10 32 33 /** 34 * struct drm_crtc_crc_entry - entry describing a frame's content 35 * @has_frame_counter: whether the source was able to provide a frame number 36 * @frame: number of the frame this CRC is about, if @has_frame_counter is true 37 * @crcs: array of values that characterize the frame 38 */ 39 struct drm_crtc_crc_entry { 40 bool has_frame_counter; 41 uint32_t frame; 42 uint32_t crcs[DRM_MAX_CRC_NR]; 43 }; 44 45 #define DRM_CRC_ENTRIES_NR 128 46 47 /** 48 * struct drm_crtc_crc - data supporting CRC capture on a given CRTC 49 * @lock: protects the fields in this struct 50 * @source: name of the currently configured source of CRCs 51 * @opened: whether userspace has opened the data file for reading 52 * @overflow: whether an overflow occured. 53 * @entries: array of entries, with size of %DRM_CRC_ENTRIES_NR 54 * @head: head of circular queue 55 * @tail: tail of circular queue 56 * @values_cnt: number of CRC values per entry, up to %DRM_MAX_CRC_NR 57 * @wq: workqueue used to synchronize reading and writing 58 */ 59 struct drm_crtc_crc { 60 spinlock_t lock; 61 const char *source; 62 bool opened, overflow; 63 struct drm_crtc_crc_entry *entries; 64 int head, tail; 65 size_t values_cnt; 66 wait_queue_head_t wq; 67 }; 68 69 #if defined(CONFIG_DEBUG_FS) 70 int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame, 71 uint32_t frame, uint32_t *crcs); 72 #else 73 static inline int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame, 74 uint32_t frame, uint32_t *crcs) 75 { 76 return -EINVAL; 77 } 78 #endif /* defined(CONFIG_DEBUG_FS) */ 79 80 #endif /* __DRM_DEBUGFS_CRC_H__ */ 81