drm/i915: Debugfs support for GuC logging control
authorSagar Arun Kamble <sagar.a.kamble@intel.com>
Wed, 12 Oct 2016 16:24:41 +0000 (21:54 +0530)
committerTvrtko Ursulin <tvrtko.ursulin@intel.com>
Tue, 25 Oct 2016 08:34:23 +0000 (09:34 +0100)
commit685534ef4c8faff1f69c9962ad3013e17354ff8b
tree999829dcefc8723e1b691442a03f8a5962120d41
parent896a0cb0fe728b24597439db684b18420ed97fde
drm/i915: Debugfs support for GuC logging control

This patch provides debugfs interface i915_guc_output_control for
on the fly enabling/disabling of logging in GuC firmware and controlling
the verbosity level of logs.
The value written to the file, should have bit 0 set to enable logging and
bits 4-7 should contain the verbosity info.

v2: Add a forceful flush, to collect left over logs, on disabling logging.
    Useful for Validation.

v3: Besides minor cleanup, implement read method for the debugfs file and
    set the guc_log_level to -1 when logging is disabled. (Tvrtko)

v4: Minor cleanup & rebase. (Tvrtko)

v5:
- Lock struct_mutex after the NULL check for guc log buffer vma. (Chris)
- Rebase.

Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@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>
drivers/gpu/drm/i915/i915_debugfs.c
drivers/gpu/drm/i915/i915_guc_submission.c
drivers/gpu/drm/i915/intel_guc.h