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TOMOYO Linux Cross Reference
Linux/include/drm/drm_debugfs_crc.h

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  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 #define DRM_MAX_CRC_NR          10
 26 
 27 /**
 28  * struct drm_crtc_crc_entry - entry describing a frame's content
 29  * @has_frame_counter: whether the source was able to provide a frame number
 30  * @frame: number of the frame this CRC is about, if @has_frame_counter is true
 31  * @crc: array of values that characterize the frame
 32  */
 33 struct drm_crtc_crc_entry {
 34         bool has_frame_counter;
 35         uint32_t frame;
 36         uint32_t crcs[DRM_MAX_CRC_NR];
 37 };
 38 
 39 #define DRM_CRC_ENTRIES_NR      128
 40 
 41 /**
 42  * struct drm_crtc_crc - data supporting CRC capture on a given CRTC
 43  * @lock: protects the fields in this struct
 44  * @source: name of the currently configured source of CRCs
 45  * @opened: whether userspace has opened the data file for reading
 46  * @overflow: whether an overflow occured.
 47  * @entries: array of entries, with size of %DRM_CRC_ENTRIES_NR
 48  * @head: head of circular queue
 49  * @tail: tail of circular queue
 50  * @values_cnt: number of CRC values per entry, up to %DRM_MAX_CRC_NR
 51  * @wq: workqueue used to synchronize reading and writing
 52  */
 53 struct drm_crtc_crc {
 54         spinlock_t lock;
 55         const char *source;
 56         bool opened, overflow;
 57         struct drm_crtc_crc_entry *entries;
 58         int head, tail;
 59         size_t values_cnt;
 60         wait_queue_head_t wq;
 61 };
 62 
 63 #if defined(CONFIG_DEBUG_FS)
 64 int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame,
 65                            uint32_t frame, uint32_t *crcs);
 66 #else
 67 static inline int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame,
 68                                          uint32_t frame, uint32_t *crcs)
 69 {
 70         return -EINVAL;
 71 }
 72 #endif /* defined(CONFIG_DEBUG_FS) */
 73 
 74 #endif /* __DRM_DEBUGFS_CRC_H__ */
 75 

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