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.
>
> [ 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
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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