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drm/i915/selftests: Wait for the context switch

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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.

Closes: https://gitlab.freedesktop.org/drm/intel/issues/1336
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200228082330.2411941-18-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-02-28 08:23:24 +00:00
parent d236e2ac53
commit b0158b9132
1 changed files with 29 additions and 11 deletions
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40
drivers/gpu/drm/i915/gt/selftest_lrc.c
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@ -4015,6 +4015,32 @@ static int emit_semaphore_signal(struct intel_context *ce, void *slot)
return 0;
}
static int context_flush(struct intel_context *ce, long timeout)
{
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, timeout) < 0)
err = -ETIME;
i915_request_put(rq);
rmb(); /* We know the request is written, make sure all state is too! */
return err;
}
static int live_lrc_layout(void *arg)
{
struct intel_gt *gt = arg;
@ -4638,18 +4664,10 @@ static int __lrc_timestamp(const struct lrc_timestamp *arg, bool preempt)
wmb();
}
if (i915_request_wait(rq, 0, HZ / 2) < 0) {
err = -ETIME;
/* And wait for switch to kernel (to save our context to memory) */
err = context_flush(arg->ce[0], HZ / 2);
if (err)
goto err;
}
/* and wait for switch to kernel */
if (igt_flush_test(arg->engine->i915)) {
err = -EIO;
goto err;
}
rmb();
if (!timestamp_advanced(arg->poison, slot[1])) {
pr_err("%s(%s): invalid timestamp on restore, context:%x, request:%x\n",