drm/i915/perf: Assert locking for i915_init_oa_perf_state()

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We use the context->pin_mutex to serialise updates to the OA config and
the registers values written into each new context. Document this
relationship and assert we do hold the context->pin_mutex as used by
gen8_configure_all_contexts() to serialise updates to the OA config
itself.

v2: Add a white-lie for when we call intel_gt_resume() from init.
v3: Lie while we have the context pinned inside atomic reset.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> #v1
Link: https://patchwork.freedesktop.org/patch/msgid/20190830181929.18663-1-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2019-08-30 19:19:29 +01:00

parent 3d1da92baf

commit dffa8feb30

3 changed files with 19 additions and 1 deletions

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7

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

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10

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

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3

drivers/gpu/drm/i915/i915_perf.c

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