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Diffstat (limited to 'drivers/gpu/drm/i915/intel_ringbuffer.h')
-rw-r--r--drivers/gpu/drm/i915/intel_ringbuffer.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 8b2b92e00e9..2ea7a311a1f 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -72,7 +72,14 @@ struct intel_ring_buffer {
u32 flush_domains);
int (*add_request)(struct intel_ring_buffer *ring,
u32 *seqno);
- u32 (*get_seqno)(struct intel_ring_buffer *ring);
+ /* Some chipsets are not quite as coherent as advertised and need
+ * an expensive kick to force a true read of the up-to-date seqno.
+ * However, the up-to-date seqno is not always required and the last
+ * seen value is good enough. Note that the seqno will always be
+ * monotonic, even if not coherent.
+ */
+ u32 (*get_seqno)(struct intel_ring_buffer *ring,
+ bool lazy_coherency);
int (*dispatch_execbuffer)(struct intel_ring_buffer *ring,
u32 offset, u32 length);
void (*cleanup)(struct intel_ring_buffer *ring);