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drm/i915: Updating comments.

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ring index calculation table was out of date after other rings were added,
although the formula is flexible and scale when adding new rings.

So this patch just update the comments and add a brief explanation
why to use sync_seqno[ring index].

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Rodrigo Vivi 2014-06-30 09:51:11 -07:00 committed by Daniel Vetter
parent f7b6423685
commit ddd4dbc6c1
2 changed files with 7 additions and 3 deletions
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2
drivers/gpu/drm/i915/i915_gem.c
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@ -2842,6 +2842,8 @@ i915_gem_object_sync(struct drm_i915_gem_object *obj,
idx = intel_ring_sync_index(from, to);
seqno = obj->last_read_seqno;
/* Optimization: Avoid semaphore sync when we are sure we already
* waited for an object with higher seqno */
if (seqno <= from->semaphore.sync_seqno[idx])
return 0;

8
drivers/gpu/drm/i915/intel_ringbuffer.h
View file

@ -238,9 +238,11 @@ intel_ring_sync_index(struct intel_engine_cs *ring,
int idx;
/*
* cs -> 0 = vcs, 1 = bcs
* vcs -> 0 = bcs, 1 = cs,
* bcs -> 0 = cs, 1 = vcs.
* rcs -> 0 = vcs, 1 = bcs, 2 = vecs, 3 = vcs2;
* vcs -> 0 = bcs, 1 = vecs, 2 = vcs2, 3 = rcs;
* bcs -> 0 = vecs, 1 = vcs2. 2 = rcs, 3 = vcs;
* vecs -> 0 = vcs2, 1 = rcs, 2 = vcs, 3 = bcs;
* vcs2 -> 0 = rcs, 1 = vcs, 2 = bcs, 3 = vecs;
*/
idx = (other - ring) - 1;