cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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drm_debugfs_crc.h (2723B)

      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 */
     33struct 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 */
     53struct 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)
     64int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame,
     65			   uint32_t frame, uint32_t *crcs);
     66#else
     67static 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__ */