[Intel-gfx] [RFC 1/8] drm/i915: Add a new PMU for handling non-OA counter data profiling requests

[Chris Wilson]

On Wed, Aug 05, 2015 at 11:25:37AM +0530, sourab.gupta at intel.com wrote:
> From: Sourab Gupta <sourab.gupta at intel.com>
> 
> The current perf PMU driver is specific for collection of OA counter
> statistics (which may be done in a periodic or asynchronous way). Since
> this enables us (and limits us) to render ring, we have no means for
> collection of data pertaining to other rings.
> 
> To overcome this limitation, we need to have a new PMU driver which enables
> data collection for other rings also (in a non-OA specific mode).
> This patch adds a new perf PMU to i915 device private, for handling
> profiling requests for non-OA counter data.This data may encompass
> timestamps, mmio register values, etc. for the relevant ring.
> The new perf PMU will serve these purposes, without constraining itself to
> type of data being dumped (which may restrict the user to specific ring
> like in case of OA counters).
> 
> The patch introduces this PMU driver alongwith its associated callbacks.
> 
> Signed-off-by: Sourab Gupta <sourab.gupta at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_dma.c     |   2 +
>  drivers/gpu/drm/i915/i915_drv.h     |  19 ++++
>  drivers/gpu/drm/i915/i915_oa_perf.c | 215 ++++++++++++++++++++++++++++++++++++

You have to admit it is a bit odd for the object to be called
i915_oa_pmu/i915_gen_pmu and the file i915_oa_perf.c
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre