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author | Akash Goel <akash.goel@intel.com> | 2016-10-12 21:54:34 +0530 |
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committer | Tvrtko Ursulin <tvrtko.ursulin@intel.com> | 2016-10-25 09:34:23 +0100 |
commit | f824083559af27d92db938733dba54617824d702 (patch) | |
tree | 30bb2dea9ab38fe70af6e56459c85bb82f9a096d /drivers/gpu/drm/i915/Kconfig | |
parent | 4100b2ab3e8b2932554295ba79371d10687f1bb4 (diff) | |
download | op-kernel-dev-f824083559af27d92db938733dba54617824d702.zip op-kernel-dev-f824083559af27d92db938733dba54617824d702.tar.gz |
drm/i915: Add a relay backed debugfs interface for capturing GuC logs
Added a new debugfs interface '/sys/kernel/debug/dri/guc_log' for the
User to capture GuC firmware logs. Availed relay framework to implement
the interface, where Driver will have to just use a relay API to store
snapshots of the GuC log buffer in the buffer managed by relay.
The snapshot will be taken when GuC firmware sends a log buffer flush
interrupt and up to four snapshots could be stored in the relay buffer.
The relay buffer will be operated in a mode where it will overwrite the
data not yet collected by User.
Besides mmap method, through which User can directly access the relay
buffer contents, relay also supports the 'poll' method. Through the 'poll'
call on log file, User can come to know whenever a new snapshot of the
log buffer is taken by Driver, so can run in tandem with the Driver and
capture the logs in a sustained/streaming manner, without any loss of data.
v2: Defer the creation of relay channel & associated debugfs file, as
debugfs setup is now done at the end of i915 Driver load. (Chris)
v3:
- Switch to no-overwrite mode for relay.
- Fix the relay sub buffer switching sequence.
v4:
- Update i915 Kconfig to select RELAY config. (TvrtKo)
- Log a message when there is no sub buffer available to capture
the GuC log buffer. (Tvrtko)
- Increase the number of relay sub buffers to 8 from 4, to have
sufficient buffering for boot time logs
v5:
- Fix the alignment, indentation issues and some minor cleanup. (Tvrtko)
- Update the comment to elaborate on why a relay channel has to be
associated with the debugfs file. (Tvrtko)
v6:
- Move the write to 'is_global' after the NULL check on parent directory
dentry pointer. (Tvrtko)
v7: Add a BUG_ON to validate relay buffer allocation size. (Chris)
Testcase: igt/tools/intel_guc_logger
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Sourab Gupta <sourab.gupta@intel.com>
Signed-off-by: Akash Goel <akash.goel@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/Kconfig')
-rw-r--r-- | drivers/gpu/drm/i915/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig index 45a5eb7..af13c624 100644 --- a/drivers/gpu/drm/i915/Kconfig +++ b/drivers/gpu/drm/i915/Kconfig @@ -11,6 +11,7 @@ config DRM_I915 select DRM_KMS_HELPER select DRM_PANEL select DRM_MIPI_DSI + select RELAY # i915 depends on ACPI_VIDEO when ACPI is enabled # but for select to work, need to select ACPI_VIDEO's dependencies, ick select BACKLIGHT_LCD_SUPPORT if ACPI |