drm/i915: reference counted forcewake

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Provide a reference count to track the forcewake state of the GPU and
give a safe mechanism for userspace to wake the GT. This also potentially
saves a UC read if the GT is known to be awake already.

The reference count is atomic, but the register access and hardware wake
sequence is protected by struct_mutex.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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This commit is contained in:

Ben Widawsky 2011-04-25 11:23:07 -07:00 • committed by Keith Packard

parent b7287d8054

commit fcca792629

5 changed files with 41 additions and 13 deletions

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4

drivers/gpu/drm/i915/i915_debugfs.c

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30

drivers/gpu/drm/i915/i915_drv.c

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11

drivers/gpu/drm/i915/i915_drv.h

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1

drivers/gpu/drm/i915/i915_irq.c

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8

drivers/gpu/drm/i915/intel_display.c

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