From: Sourab Gupta <sourab.gupta@xxxxxxxxx> This is an updated patch set (changes list at end), which builds upon the multi context OA patch set introduced earlier at: http://lists.freedesktop.org/archives/intel-gfx/2015-July/071697.html The OA unit, as such, is specific to render ring and can't cater to performance data requirements for other GPU engines. Specifically, the media workloads may utilize other GPU engines, but there is currently no framework which can be used to query performance statistics for non-RCS workloads and provide this data to userspace tools. This patch set tries to address this specific problem. The aim of this patch series is to build upon the perf event framework developed earlier and use it for forwarding performance data of non-RCS engine workloads. Since the previous PMU is customized to handle OA reports, a new perf PMU is added to handle generic non-OA performance data. An example of such non-OA performance data is the timestamps/mmio registers. This patch set enables framework for capturing the timestamps at batch buffer boundaries, by inserting commands for the same in ringbuffer, and forwarding the samples to userspace through perf interface. Nevertheless, the framework and data structures can be extended to introduce more performance data types (other than timestamps). The intention here is to introduce a framework to enable capturing of generic performance data and forwarding the same to userspace using perf apis. The reports generated will again have an additional footer for metadata information such as ctx_id, pid, ring id and tags (in the same way as done for OA reports specified in the patch series earlier). This information can be used by userspace tools such as MVP (Modular Video Profiler) to associate reports with individual contexts and different stages of workload execution. In this patch set, the timestamps are captured at BB boundaries by inserting the commands in the ringbuffer at the batchbuffer boundaries. As specified earlier, for a system wide GPU profiler, the relative complexity of doing this in kernel is significantly less than supporting this usecase through userspace command insertion by all the different components. The final patch in the series tries to extend the data structures to enable capture of upto 8 MMIO register values, in conjunction with timestamps v2: This patch series has the following changes wrt the one floated earlier: - Removing synchronous waits during event stop/destroy - segregating the book-keeping data for the samples from destination buffer and collecting it into a separate list - managing the lifetime of destination buffer with the help of gem active reference tracking - having the scope of i915 device mutex limited to places of gem interaction and having the pmu data structures protected with a per pmu lock - userspace can now control the metadata it wants by requesting the same during event init. The sample is sent with the requested metadata in a packed format. - Some patches merged together and a few more introduced - mmio whitelist in place Sourab Gupta (8): drm/i915: Add a new PMU for handling non-OA counter data profiling requests drm/i915: Add mechanism for forwarding the timestamp data through perf drm/i915: Handle event stop and destroy for GPU commands submitted drm/i915: Insert commands for capturing timestamps in the ring drm/i915: Add support for forwarding ring id in sample metadata through perf drm/i915: Add support for forwarding pid in timestamp sample metadata through perf drm/i915: Add support for forwarding execbuffer tags in timestamp sample metadata drm/i915: Support for retrieving MMIO register values alongwith timestamps through perf drivers/gpu/drm/i915/i915_dma.c | 2 + drivers/gpu/drm/i915/i915_drv.h | 41 +++ drivers/gpu/drm/i915/i915_oa_perf.c | 680 ++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_reg.h | 2 + include/uapi/drm/i915_drm.h | 41 +++ 5 files changed, 766 insertions(+) -- 1.8.5.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
