drm/i915: Wrap around the tail offset before setting ring->tail

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The HW only accepts offsets within ring->size, and fails peculiarly if
the RING_HEAD or RING_TAIL is set to ring->size. Therefore whenever we
set ring->head/ring->tail we want to make sure it is within value (using
intel_ring_wrap()).

v2: Double check execlists as well
v3: Remove redundancy with assert_ring_tail_valid()
v4: Just assert in intel_ring_reset() rather than be over-defensive.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> #v2
Link: https://patchwork.freedesktop.org/patch/msgid/20180611110845.31890-2-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2018-06-11 12:08:45 +01:00

parent b3ee09a4de

commit 41d37680ca

3 changed files with 24 additions and 8 deletions

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6

drivers/gpu/drm/i915/intel_lrc.c

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6

drivers/gpu/drm/i915/intel_ringbuffer.c

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20

drivers/gpu/drm/i915/intel_ringbuffer.h

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