drm/i915/gt: Explicitly clear BB_OFFSET for new contexts

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Even though the initial protocontext we load onto HW has the register
cleared, by the time we save it into the default image, BB_OFFSET has
had the enable bit set. Reclear BB_OFFSET for each new context.

Testcase: igt/i915_selftests/gt_lrc

v2:
  Extend it for gen8.
v3:
  BB_OFFSET is recorded per engine from Gen9 onwards

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Thomas Hellstrom <thomas.hellstrom@linux.intel.com>
Signed-off-by: Karolina Drobnik <karolina.drobnik@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/37c67abb3303852f06a570a4360addf52bf941c1.1663081418.git.karolina.drobnik@intel.com

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Chris Wilson 2022-09-13 17:21:48 +02:00 • committed by Andi Shyti

parent 69a3738ba5

commit c9424fa1f8

3 changed files with 26 additions and 0 deletions

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1

drivers/gpu/drm/i915/gt/intel_engine_regs.h

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20

drivers/gpu/drm/i915/gt/intel_lrc.c

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5

drivers/gpu/drm/i915/gt/selftest_lrc.c

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