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drm/i915/perf: Allow non-privileged access when OA buffer is not sampled

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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: 00a7f0d715 ("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
This commit is contained in:
Umesh Nerlige Ramappa 2019-12-06 11:43:38 -08:00 committed by Lionel Landwerlin
parent d3e483526c
commit 322d56aa31
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/i915/i915_perf.c
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@ -2722,7 +2722,8 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
return -EINVAL;
}
if (!(props->sample_flags & SAMPLE_OA_REPORT)) {
if (!(props->sample_flags & SAMPLE_OA_REPORT) &&
(INTEL_GEN(perf->i915) < 12 || !stream->ctx)) {
DRM_DEBUG("Only OA report sampling supported\n");
return -EINVAL;
}
@ -2754,7 +2755,7 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
format_size = perf->oa_formats[props->oa_format].size;
stream->sample_flags |= SAMPLE_OA_REPORT;
stream->sample_flags = props->sample_flags;
stream->sample_size += format_size;
stream->oa_buffer.format_size = format_size;