As we require a context switch to ensure that the current context is
switched out and saved to memory, perform an explicit switch to the
kernel context and wait for it.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gt/selftest_lrc.c | 37 +++++++++++++++++++-------
1 file changed, 28 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
index d7f98aada626..95da6b880e3f 100644
--- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
@@ -4015,6 +4015,31 @@ static int emit_semaphore_signal(struct intel_context *ce, void *slot)
return 0;
}
+static int context_sync(struct intel_context *ce)
+{
+ struct i915_request *rq;
+ struct dma_fence *fence;
+ int err = 0;
+
+ rq = intel_engine_create_kernel_request(ce->engine);
+ if (IS_ERR(rq))
+ return PTR_ERR(rq);
+
+ fence = i915_active_fence_get(&ce->timeline->last_request);
+ if (fence) {
+ i915_request_await_dma_fence(rq, fence);
+ dma_fence_put(fence);
+ }
+
+ rq = i915_request_get(rq);
+ i915_request_add(rq);
+ if (i915_request_wait(rq, 0, HZ / 2) < 0)
+ err = -ETIME;
+ i915_request_put(rq);
+
+ return err;
+}
+
static int live_lrc_layout(void *arg)
{
struct intel_gt *gt = arg;
@@ -4638,16 +4663,10 @@ static int __lrc_timestamp(const struct lrc_timestamp *arg, bool preempt)
wmb();
}
- if (i915_request_wait(rq, 0, HZ / 2) < 0) {
- err = -ETIME;
- goto err;
- }
-
- /* and wait for switch to kernel */
- if (igt_flush_test(arg->engine->i915)) {
- err = -EIO;
+ /* and wait for switch to kernel (to save our context to memory) */
+ err = context_sync(arg->ce[0]);
+ if (err)
goto err;
- }
rmb();
--
2.25.1
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