drm/i915/perf: Allow non-privileged access when OA buffer is not sampled
authorUmesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Fri, 6 Dec 2019 19:43:38 +0000 (11:43 -0800)
committerJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Tue, 10 Dec 2019 10:37:52 +0000 (12:37 +0200)
commit2a264a0fd4dc9aa7900fd181c3a6464027cb4df1
tree135799323e1a0b62bc24ada8955bb856fe910470
parent36deeddcd3699c2755ed21c8d2595b1728d844e5
drm/i915/perf: Allow non-privileged access when OA buffer is not sampled

SAMPLE_OA_REPORT enables sampling of OA reports from the OA buffer.
Since reports from OA buffer had system wide visibility, collecting
samples from the OA buffer was a privileged operation on previous
platforms. Prior to TGL, it was also necessary to sample the OA buffer
to normalize reports from MI REPORT PERF COUNT.

TGL has a dedicated OAR unit to sample perf reports for a specific
render context. This removes the necessity to sample OA buffer.

- If not sampling the OA buffer, allow non-privileged access. An earlier
  patch allows the non-privilege access:
  https://patchwork.freedesktop.org/patch/337716/?series=68582&rev=1
- Clear up the path for non-privileged access in this patch

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Fixes: 00a7f0d7155c ("drm/i915/tgl: Add perf support on TGL")
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191206194339.31356-1-umesh.nerlige.ramappa@intel.com
(cherry picked from commit 322d56aa3145a28445907ecc638a2c3aa3295c6b)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
drivers/gpu/drm/i915/i915_perf.c