drm/i915: Convert engine->write_tail to operate on a request

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If we rewrite the I915_WRITE_TAIL specialisation for the legacy
ringbuffer as submitting the request onto the ringbuffer, we can unify
the vfunc with both execlists and GuC in the next patch.

v2: Drop the modulus from the I915_WRITE_TAIL as it is currently being
applied in intel_ring_advance() after every command packet, and add a
comment explaining why we need the modulus at all.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1469432687-22756-22-git-send-email-chris@chris-wilson.co.uk
Link: http://patchwork.freedesktop.org/patch/msgid/1470174640-18242-12-git-send-email-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2016-08-02 22:50:29 +01:00

parent ba76d91bc0

commit c5efa1ad09

3 changed files with 36 additions and 33 deletions

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8

drivers/gpu/drm/i915/i915_gem_request.c

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51

drivers/gpu/drm/i915/intel_ringbuffer.c

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10

drivers/gpu/drm/i915/intel_ringbuffer.h

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