With the addition of the inter-context intel_time.sync map, having a
very similar sync_seqno[] is confusing. Aide the reader by denoting that
this is a pre-allocated array for storing semaphore sync points wrt to
the global seqno.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_request.c | 8 ++++----
drivers/gpu/drm/i915/i915_gem_timeline.h | 9 ++++++++-
2 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index 637b8cddf988..b6246b50e375 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -218,8 +218,8 @@ static int reset_all_global_seqno(struct drm_i915_private *i915, u32 seqno)
tl->seqno = seqno;
list_for_each_entry(timeline, &i915->gt.timelines, link)
- memset(timeline->engine[id].sync_seqno, 0,
- sizeof(timeline->engine[id].sync_seqno));
+ memset(timeline->engine[id].global_sync, 0,
+ sizeof(timeline->engine[id].global_sync));
}
return 0;
@@ -715,7 +715,7 @@ i915_gem_request_await_request(struct drm_i915_gem_request *to,
return ret < 0 ? ret : 0;
}
- if (seqno <= to->timeline->sync_seqno[from->engine->id])
+ if (seqno <= to->timeline->global_sync[from->engine->id])
return 0;
trace_i915_gem_ring_sync_to(to, from);
@@ -733,7 +733,7 @@ i915_gem_request_await_request(struct drm_i915_gem_request *to,
return ret;
}
- to->timeline->sync_seqno[from->engine->id] = seqno;
+ to->timeline->global_sync[from->engine->id] = seqno;
return 0;
}
diff --git a/drivers/gpu/drm/i915/i915_gem_timeline.h b/drivers/gpu/drm/i915/i915_gem_timeline.h
index ff65c648407f..bfb5eb94c64d 100644
--- a/drivers/gpu/drm/i915/i915_gem_timeline.h
+++ b/drivers/gpu/drm/i915/i915_gem_timeline.h
@@ -68,7 +68,14 @@ struct intel_timeline {
* redundant and we can discard it without loss of generality.
*/
struct i915_syncmap *sync;
- u32 sync_seqno[I915_NUM_ENGINES];
+ /**
+ * Separately to the inter-context seqno map above, we track the last
+ * barrier (e.g. semaphore wait) to the global engine timelines. Note
+ * that this tracks global_seqno rather than the context.seqno, and
+ * so it is subject to the limitations of hw wraparound and that we
+ * may need to revoke global_seqno (on pre-emption).
+ */
+ u32 global_sync[I915_NUM_ENGINES];
struct i915_gem_timeline *common;
};
--
2.11.0
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