From c64929ff90801cf1cb8a7fd30be7b272d61ca22d Mon Sep 17 00:00:00 2001
From: Rob Clark <robdclark@chromium.org>
Date: Sun, 4 Oct 2020 10:18:55 -0700
Subject: [PATCH] drm/msm: Don't implicit-sync if only a single ring
If there is only a single ring (no-preemption), everything is FIFO order
and there is no need to implicit-sync.
Mesa should probably just always use MSM_SUBMIT_NO_IMPLICIT, as behavior
is undefined when fences are not used to synchronize buffer usage across
contexts (which is the only case where multiple different priority rings
could come into play).
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
---
drivers/gpu/drm/msm/msm_gem_submit.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index c757bb8857ea7..601d53eacd8e1 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -283,7 +283,7 @@ static int submit_lock_objects(struct msm_gem_submit *submit)
return ret;
}
-static int submit_fence_sync(struct msm_gem_submit *submit, bool no_implicit)
+static int submit_fence_sync(struct msm_gem_submit *submit, bool implicit_sync)
{
int i, ret = 0;
@@ -303,7 +303,7 @@ static int submit_fence_sync(struct msm_gem_submit *submit, bool no_implicit)
return ret;
}
- if (no_implicit)
+ if (!implicit_sync)
continue;
ret = msm_gem_sync_object(&msm_obj->base, submit->ring->fctx,
@@ -774,7 +774,8 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
if (ret)
goto out;
- ret = submit_fence_sync(submit, !!(args->flags & MSM_SUBMIT_NO_IMPLICIT));
+ ret = submit_fence_sync(submit, (gpu->nr_rings > 1) &&
+ !(args->flags & MSM_SUBMIT_NO_IMPLICIT));
if (ret)
goto out;
--
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