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drm/i915: Share the computation of ring size for RING_CTL register

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Since both legacy and execlists want to populate the RING_CTL register,
share the computation of the right bits for the ring->size. We can then
stop masking errors and explicitly forbid them during creation!

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161004201132.21801-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2016-10-04 21:11:25 +01:00
parent 615e500083
commit 62ae14b1ed
3 changed files with 4 additions and 4 deletions
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5
drivers/gpu/drm/i915/intel_ringbuffer.c
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@@ -585,9 +585,7 @@ static int init_ring_common(struct intel_engine_cs *engine)
I915_WRITE_TAIL(engine, ring->tail);
(void)I915_READ_TAIL(engine);
I915_WRITE_CTL(engine,
((ring->size - PAGE_SIZE) & RING_NR_PAGES)
| RING_VALID);
I915_WRITE_CTL(engine, RING_CTL_SIZE(ring->size) | RING_VALID);
/* If the head is still not zero, the ring is dead */
if (intel_wait_for_register_fw(dev_priv, RING_CTL(engine->mmio_base),
@@ -1951,6 +1949,7 @@ intel_engine_create_ring(struct intel_engine_cs *engine, int size)
struct i915_vma *vma;
GEM_BUG_ON(!is_power_of_2(size));
GEM_BUG_ON(RING_CTL_SIZE(size) & ~RING_NR_PAGES);
ring = kzalloc(sizeof(*ring), GFP_KERNEL);
if (!ring)