I forgot to mentioned this was tested on SKL GT4 using 2 OA/NOA
configurations that exposes :
1. signals of the state of power on each slice/subslice
2. signals of the number of sampler cache misses on each slice
We verified that the counters incrementing on those signals return to
normal values when you switch between 2 different context with 2
different RPCS configurations (as opposed to running the same
configurations without this series).
We used Chris's series to expose RPCS configuration to userspace :
https://github.com/djdeath/linux/commit/b2ea9b16ef1377f808be4d4c60f5f23596517f49
You can pull the branch with those changes here :
https://github.com/djdeath/linux/commits/wip/djdeath/oa-next-slice-control
Cheers,
-
Lionel
On 30/08/17 19:20, Lionel Landwerlin wrote:
Hi all,
This little series implements NOA muxes reprogramming on context
switch through the per context batch buffer.
NOA muxes resides in slices & subslices, which makes their
configuration subject to loss when a slice or subslice is shutdown.
The goal of this series is to restore the configuration on context
switch. It currently reloads all configurations on context switch but
we may be able to be a bit more clever by copying the last RPCS
configuration in memory and compare the current configuration before
executing all the MI_LRIs using a MI_PREDICATE.
Looking forward to comments!
Cheers,
Lionel Landwerlin (4):
drm/i915: use same define size for wa_bb pin/allocation
drm/i915: extract per-ctx/indirect bb programming
drm/i915: pass wa_ctx as argument
drm/i915: reprogram NOA muxes on context switch when using perf
drivers/gpu/drm/i915/i915_drv.h | 2 +
drivers/gpu/drm/i915/i915_perf.c | 77 +++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_lrc.c | 110 ++++++++++++++++++++++++++++++---------
drivers/gpu/drm/i915/intel_lrc.h | 1 +
4 files changed, 166 insertions(+), 24 deletions(-)
--
2.14.1
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