drm/i915: Rearrange switch_context to load the aliasing ppgtt on first use

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The code to switch_mm() is already handled by i915_switch_context(), the
only difference required to setup the aliasing ppgtt is that we need to
emit te switch_mm() on the first context, i.e. when transitioning from
engine->last_context == NULL. This allows us to defer the
initialisation of the GPU from early device initialisation to first use,
which should marginally speed up both. The caveat is that we then defer
the context initialisation until first use - i.e. we cannot assume that
the GPU engines are initialised. For example, this means that power
contexts for rc6 (Ironlake) need to explicitly loaded, as they are.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1461833819-3991-11-git-send-email-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2016-04-28 09:56:45 +01:00

parent d200cda6bd

commit f9326be5f1

5 changed files with 31 additions and 92 deletions

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1

drivers/gpu/drm/i915/i915_drv.h

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30

drivers/gpu/drm/i915/i915_gem.c

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77

drivers/gpu/drm/i915/i915_gem_context.c

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14

drivers/gpu/drm/i915/i915_gem_gtt.c

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1

drivers/gpu/drm/i915/i915_gem_gtt.h

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