From: Michal Wajdeczko Date: Fri, 19 Jan 2018 12:49:26 +0000 Subject: drm/i915/guc: Keep GuC log disabled by default Git-commit: bd724318b682587ad2f989ab8e0f7b3d4486ced5 Patch-mainline: v4.17-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 It looks that GuC log functionality is not fully functional yet and causes issues when enabled by auto(-1) modparam on debug builds. For example, but not limited to: [ 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. References: 0ed87953532652 ("drm/i915/guc: Redefine guc_log_level modparam values") Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104693 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104694 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104695 Signed-off-by: Michal Wajdeczko Cc: Chris Wilson Cc: Jani Saarinen Cc: Tomi Sarvela Cc: Marta Lofstedt Cc: Michal Winiarski Link: https://patchwork.freedesktop.org/patch/msgid/20180119124926.29844-1-michal.wajdeczko@intel.com Reviewed-by: Michal Winiarski Signed-off-by: Chris Wilson Acked-by: Petr Tesarik --- drivers/gpu/drm/i915/i915_params.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/i915/i915_params.h +++ b/drivers/gpu/drm/i915/i915_params.h @@ -48,7 +48,7 @@ struct drm_printer; 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) \