/*
* Copyright © 2016 Collabora Ltd .
*
* Permission is hereby granted , free of charge , to any person obtaining a
* copy of this software and associated documentation files ( the " Software " ) ,
* to deal in the Software without restriction , including without limitation
* the rights to use , copy , modify , merge , publish , distribute , sublicense ,
* and / or sell copies of the Software , and to permit persons to whom the
* Software is furnished to do so , subject to the following conditions :
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software .
*
* THE SOFTWARE IS PROVIDED " AS IS " , WITHOUT WARRANTY OF ANY KIND , EXPRESS OR
* IMPLIED , INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY ,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT . IN NO EVENT SHALL
* THE COPYRIGHT HOLDER ( S ) OR AUTHOR ( S ) BE LIABLE FOR ANY CLAIM , DAMAGES OR
* OTHER LIABILITY , WHETHER IN AN ACTION OF CONTRACT , TORT OR OTHERWISE ,
* ARISING FROM , OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE .
*/
#ifndef __DRM_DEBUGFS_CRC_H__
#define __DRM_DEBUGFS_CRC_H__
#include <linux/spinlock_types.h>
#include <linux/types.h>
#include <linux/wait.h>
struct drm_crtc;
#define DRM_MAX_CRC_NR 10
/**
* struct drm_crtc_crc_entry - entry describing a frame ' s content
* @ has_frame_counter : whether the source was able to provide a frame number
* @ frame : number of the frame this CRC is about , if @ has_frame_counter is true
* @ crcs : array of values that characterize the frame
*/
struct drm_crtc_crc_entry {
bool has_frame_counter;
uint32_t frame;
uint32_t crcs[DRM_MAX_CRC_NR];
};
#define DRM_CRC_ENTRIES_NR 128
/**
* struct drm_crtc_crc - data supporting CRC capture on a given CRTC
* @ lock : protects the fields in this struct
* @ source : name of the currently configured source of CRCs
* @ opened : whether userspace has opened the data file for reading
* @ overflow : whether an overflow occured .
* @ entries : array of entries , with size of % DRM_CRC_ENTRIES_NR
* @ head : head of circular queue
* @ tail : tail of circular queue
* @ values_cnt : number of CRC values per entry , up to % DRM_MAX_CRC_NR
* @ wq : workqueue used to synchronize reading and writing
*/
struct drm_crtc_crc {
spinlock_t lock;
const char *source;
bool opened, overflow;
struct drm_crtc_crc_entry *entries;
int head, tail;
size_t values_cnt;
wait_queue_head_t wq;
};
#if defined (CONFIG_DEBUG_FS)
int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame,
uint32_t frame, uint32_t *crcs);
#else
static inline int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame,
uint32_t frame, uint32_t *crcs)
{
return -EINVAL;
}
#endif /* defined(CONFIG_DEBUG_FS) */
#endif /* __DRM_DEBUGFS_CRC_H__ */
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