diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_ringbuffer.h')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.h | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h index b44c67849749..e9494557aaa1 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.h +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h @@ -805,6 +805,19 @@ static inline u32 intel_ring_wrap(const struct intel_ring *ring, u32 pos) return pos & (ring->size - 1); } +static inline bool +intel_ring_offset_valid(const struct intel_ring *ring, + unsigned int pos) +{ + if (pos & -ring->size) /* must be strictly within the ring */ + return false; + + if (!IS_ALIGNED(pos, 8)) /* must be qword aligned */ + return false; + + return true; +} + static inline u32 intel_ring_offset(const struct i915_request *rq, void *addr) { /* Don't write ring->size (equivalent to 0) as that hangs some GPUs. */ @@ -816,12 +829,7 @@ static inline u32 intel_ring_offset(const struct i915_request *rq, void *addr) static inline void assert_ring_tail_valid(const struct intel_ring *ring, unsigned int tail) { - /* We could combine these into a single tail operation, but keeping - * them as seperate tests will help identify the cause should one - * ever fire. - */ - GEM_BUG_ON(!IS_ALIGNED(tail, 8)); - GEM_BUG_ON(tail >= ring->size); + GEM_BUG_ON(!intel_ring_offset_valid(ring, tail)); /* * "Ring Buffer Use" |