[Intel-gfx] [RFC 7/7] drm/i915: Add support for retrieving MMIO register values in Gen Perf PMU

[Chris Wilson]

On Mon, Jun 22, 2015 at 03:25:09PM +0530, sourab.gupta at intel.com wrote:
> From: Sourab Gupta <sourab.gupta at intel.com>
> 
> This patch adds support for retrieving MMIO register values through Gen Perf PMU
> interface. Through this interface, now the userspace can request upto 8 MMIO
> register values to be dumped, alongwith the timestamp values which were dumped
> earlier across the batchbuffer boundaries.
> Userspace can pass the addresses of upto 8 MMIO registers through perf attr
> config. The commands to dump the values of these MMIO registers are then
> inserted into the ring alongwith commands to dump the timestamps.

I don't see any whitelisting of allowed register targets...
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre