drm/i915: Track the previous pinned context inside the request

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As the contexts are accessed by the hardware until the switch is completed
to a new context, the hardware may still be writing to the context object
after the breadcrumb is visible. We must not unpin/unbind/prune that
object whilst still active and so we keep the previous context pinned until
the following request. We can generalise the tracking we already do via
the engine->last_context and move it to the request so that it works
equally for execlists and GuC.

v2: Drop the execlists double pin as that exposes a race inside the lrc
irq handler as it tries to access the context after it may be retired.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1461833819-3991-22-git-send-email-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2016-04-28 09:56:56 +01:00

parent 73db04cfa8

commit a16a405259

3 changed files with 23 additions and 10 deletions

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11

drivers/gpu/drm/i915/i915_drv.h

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8

drivers/gpu/drm/i915/i915_gem.c

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14

drivers/gpu/drm/i915/intel_lrc.c

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