On Fri, 19 Jan 2018, Michał Winiarski <[email protected]> wrote:
> On Fri, Jan 19, 2018 at 12:49:26PM +0000, Michal Wajdeczko wrote:
>> It looks that GuC log functionality is not fully functional yet and
>> causes issues when enabled by auto(-1) modparam on debug builds.
This could use a better explanation. Now it seems like you're just
sweeping things under the carpet.
>>
>> [ 30.062893] ======================================================
>> [ 30.062894] WARNING: possible circular locking dependency detected
>> [ 30.062895] 4.15.0-rc8-CI-CI_DRM_3648+ #1 Tainted: G U
>> [ 30.062896] ------------------------------------------------------
>> [ 30.062897] debugfs_test/1268 is trying to acquire lock:
>> [ 30.062898] (&dev->struct_mutex){+.+.}, at: [<00000000e4213449>]
>> i915_mutex_lock_interruptible+0x47/0x130 [i915]
>> [ 30.062921]
>> but task is already holding lock:
>> [ 30.062921] (&mm->mmap_sem){++++}, at: [<00000000dd7adc93>]
>> __do_page_fault+0x106/0x560
>> [ 30.062924]
>> which lock already depends on the new lock.
>>
>
> I'd leave the lockdep splat out of here, since that's just the tip of the
> iceberg :)
>
>> Fixes: 0ed87953532652 ("drm/i915/guc: Redefine guc_log_level modparam
>> values")
>
> s/Fixes/References
References should generally reference URIs I think.
BR,
Jani.
>
> It allows us to get test results while we're fixing the logging issues, so:
>
> Reviewed-by: Michał Winiarski <[email protected]>
>
> -Michał
>
>> Signed-off-by: Michal Wajdeczko <[email protected]>
>> Cc: Chris Wilson <[email protected]>
>> Cc: Jani Saarinen <[email protected]>
>> Cc: Tomi Sarvela <[email protected]>
>> Cc: Marta Lofstedt <[email protected]>
>> Cc: Michal Winiarski <[email protected]>
>> ---
>> drivers/gpu/drm/i915/i915_params.h | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_params.h
>> b/drivers/gpu/drm/i915/i915_params.h
>> index c963603..430f5f9 100644
>> --- a/drivers/gpu/drm/i915/i915_params.h
>> +++ b/drivers/gpu/drm/i915/i915_params.h
>> @@ -48,7 +48,7 @@
>> param(int, enable_ips, 1) \
>> param(int, invert_brightness, 0) \
>> param(int, enable_guc, 0) \
>> - param(int, guc_log_level, -1) \
>> + param(int, guc_log_level, 0) \
>> param(char *, guc_firmware_path, NULL) \
>> param(char *, huc_firmware_path, NULL) \
>> param(int, mmio_debug, 0) \
>> --
>> 1.9.1
>>
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--
Jani Nikula, Intel Open Source Technology Center
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