drm/i915: Unwind incomplete legacy context switches

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The legacy context switch for ringbuffer submission is multistaged,
where each of those stages may fail. However, we were updating global
state after some stages, and so we had to force the incomplete request
to be submitted because we could not unwind. Save the global state
before performing the switches, and so enable us to unwind back to the
previous global state should any phase fail. We then must cancel the
request instead of submitting it should the construction fail.

v2: s/saved_ctx/from_ctx/; s/ctx/to_ctx/ etc.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171123152631.31385-1-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2017-11-23 15:26:30 +00:00

parent c83a8d4a2e

commit b1c24a6137

4 changed files with 65 additions and 128 deletions

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189

drivers/gpu/drm/i915/i915_gem_context.c

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18

drivers/gpu/drm/i915/i915_gem_request.c

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1

drivers/gpu/drm/i915/intel_ringbuffer.c

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1

drivers/gpu/drm/i915/intel_ringbuffer.h

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