[Bug 95472] [i915] Feature request: Add support for fencing for PRIME setups

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95472

--- Comment #27 from Chris Wilson <chris at chris-wilson.co.uk> ---
Next attempt,

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index f72e8e68e394..d29d6824ece3 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1447,6 +1447,8 @@ static int eb_add_reservations(struct reservation_object
*resv,
                        fence_put(fence);
                        if (ret < 0)
                                goto err;
+
+                       pr_err("third party read fence: %d\n", ret);
                }
        }

@@ -1457,6 +1459,8 @@ static int eb_add_reservations(struct reservation_object
*resv,
                fence_put(fence);
                if (ret < 0)
                        goto err;
+
+               pr_err("third party write fence: %d\n", ret);
        }

        ret = 0;

just to confirm whether the fences are no-ops or not.

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