The way our hardware is designed doesn't seem to let us use the MI_RECORD_PERF_COUNT command without setting up a circular buffer. In the case where the user didn't request OA reports to be available through the i915 perf stream, we can set the OA buffer to the minimum size to avoid consuming memory which won't be used by the driver. v2: Simplify oa buffer size exponent selection (Chris) Reuse vma size field (Lionel) v3: Restrict size opening parameter to values supported by HW (Chris) v4: Drop out of date comment (Matt) Add debug message when buffer size is rejected (Matt)
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| @@ -1540,6 +1540,13 @@ enum drm_i915_perf_property_id { · 1539 unmodified lines | ||
| 1540 | 1540 | */ |
| 1541 | 1541 | DRM_I915_PERF_PROP_OA_EXPONENT, |
| 1542 | 1542 | |
| 1543 | + /** | |
| 1544 | + * Specify a global OA buffer size to be allocated in bytes. The size | |
| 1545 | + * specified must be supported by HW (currently supported sizes are | |
| 1546 | + * powers of 2 ranging from 128Kb to 16Mb). | |
| 1547 | + */ | |
| 1548 | + DRM_I915_PERF_PROP_OA_BUFFER_SIZE, | |
| 1549 | + | |
| 1543 | 1550 | DRM_I915_PERF_PROP_MAX /* non-ABI */ |
| 1544 | 1551 | }; |
| 1545 | 1552 | |