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Adds files and directories to debugfs for controlling and reading frame
CRCs, per CRTC:
dri/0/crtc-0/crc
dri/0/crtc-0/crc/control
dri/0/crtc-0/crc/data
Drivers can implement the set_crc_source callback() in drm_crtc_funcs to
start and stop generating frame CRCs and can add entries to the output
by calling drm_crtc_add_crc_entry.
v2:
- Lots of good fixes suggested by Thierry.
- Added documentation.
- Changed the debugfs layout.
- Moved to allocate the entries circular queue once when frame
generation gets enabled for the first time.
v3:
- Use the control file just to select the source, and start and stop
capture when the data file is opened and closed, respectively.
- Make variable the number of CRC values per entry, per source.
- Allocate entries queue each time we start capturing as now there
isn't a fixed number of CRC values per entry.
- Store the frame counter in the data file as a 8-digit hex number.
- For sources that cannot provide useful frame numbers, place
XXXXXXXX in the frame field.
v4:
- Build only if CONFIG_DEBUG_FS is enabled.
- Use memdup_user_nul.
- Consolidate calculation of the size of an entry in a helper.
- Add 0x prefix to hex numbers in the data file.
- Remove unnecessary snprintf and strlen usage in read callback.
v5:
- Made the crcs array in drm_crtc_crc_entry fixed-size
- Lots of other smaller improvements suggested by Emil Velikov
v7:
- Move definition of drm_debugfs_crtc_crc_add to drm_internal.h
v8:
- Call debugfs_remove_recursive when we fail to create the minor
device
v9:
- Register the debugfs directory for a crtc from
drm_crtc_register_all()
v10:
- Don't let debugfs failures interrupt CRTC registration (Emil
Velikov)
v11:
- Remove extra brace that broke compilation. Sorry!
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1475767268-14379-3-git-send-email-tomeu.vizoso@collabora.com
74 lines
2.6 KiB
C
74 lines
2.6 KiB
C
/*
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* Copyright © 2016 Collabora Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __DRM_DEBUGFS_CRC_H__
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#define __DRM_DEBUGFS_CRC_H__
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#define DRM_MAX_CRC_NR 10
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/**
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* struct drm_crtc_crc_entry - entry describing a frame's content
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* @has_frame_counter: whether the source was able to provide a frame number
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* @frame: number of the frame this CRC is about, if @has_frame_counter is true
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* @crc: array of values that characterize the frame
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*/
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struct drm_crtc_crc_entry {
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bool has_frame_counter;
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uint32_t frame;
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uint32_t crcs[DRM_MAX_CRC_NR];
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};
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#define DRM_CRC_ENTRIES_NR 128
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/**
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* struct drm_crtc_crc - data supporting CRC capture on a given CRTC
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* @lock: protects the fields in this struct
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* @source: name of the currently configured source of CRCs
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* @opened: whether userspace has opened the data file for reading
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* @entries: array of entries, with size of %DRM_CRC_ENTRIES_NR
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* @head: head of circular queue
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* @tail: tail of circular queue
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* @values_cnt: number of CRC values per entry, up to %DRM_MAX_CRC_NR
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* @wq: workqueue used to synchronize reading and writing
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*/
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struct drm_crtc_crc {
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spinlock_t lock;
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const char *source;
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bool opened;
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struct drm_crtc_crc_entry *entries;
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int head, tail;
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size_t values_cnt;
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wait_queue_head_t wq;
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};
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#if defined(CONFIG_DEBUG_FS)
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int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame,
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uint32_t frame, uint32_t *crcs);
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#else
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static inline int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame,
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uint32_t frame, uint32_t *crcs)
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{
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return -EINVAL;
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}
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#endif /* defined(CONFIG_DEBUG_FS) */
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#endif /* __DRM_DEBUGFS_CRC_H__ */
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