Re: [PATCH v2 0/8] Gen9 HW whitelist and Preemption WA patches

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On 21/01/2016 15:17, Chris Wilson wrote:
On Thu, Jan 21, 2016 at 02:00:39PM +0000, Arun Siluvery wrote:
Resending all patches as told by Daniel because I didn't use correct
message-id while replying updated version of Patch1 before which means
patchwork won't pickup and we won't have CI results. Previous updates
regarding Patch1 are available at https://patchwork.freedesktop.org/patch/70527/

Some of the WA patches are now reviewed so I added r-b tags for them.

Reviewed: 1, 2, 3, 5, 6
Updated: 4 (to address review comment)
To be reviewed: 4, 7, 8

Arun Siluvery (8):
   drm/i915/gen9: Add framework to whitelist specific GPU registers
   drm/i915/gen9: Add GEN8_CS_CHICKEN1 to HW whitelist
   drm/i915/gen9: Add HDC_CHICKEN1 to HW whitelist
   drm/i915/bxt: Add GEN9_CS_DEBUG_MODE1 to HW whitelist
   drm/i915/bxt: Add GEN8_L3SQCREG4 to HW whitelist
   drm/i915/skl: Add GEN8_L3SQCREG4 to HW whitelist
   drm/i915/skl: Enable Per context Preemption granularity control
   drm/i915/gen9: Add WaOCLCoherentLineFlush

With bland changelogs, it is impossible to assess the severity of the
issues being addressed. How many of these do we need to apply to kernel
release to address potential user impact? Which do backporters need?
Are they critical stability fixes or power tuning or enabling for future
features?
-Chris

All of these changes are required for Preemption so they affect Gen9 only. The whitelist changes are really to support for preemption WA that are going to be part of UMD. The WA data is sketchy and for some of them hsd links are not available so I don't really know the details.

regards
Arun

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