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: 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
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@ -2722,7 +2722,8 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
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return -EINVAL;
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}
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if (!(props->sample_flags & SAMPLE_OA_REPORT)) {
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if (!(props->sample_flags & SAMPLE_OA_REPORT) &&
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(INTEL_GEN(perf->i915) < 12 || !stream->ctx)) {
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DRM_DEBUG("Only OA report sampling supported\n");
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return -EINVAL;
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}
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@ -2754,7 +2755,7 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
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format_size = perf->oa_formats[props->oa_format].size;
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stream->sample_flags |= SAMPLE_OA_REPORT;
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stream->sample_flags = props->sample_flags;
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stream->sample_size += format_size;
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stream->oa_buffer.format_size = format_size;
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