[Intel-gfx] [PATCH i-g-t] igt/perf_pmu: Disable accuracy tests for guc

[Tvrtko Ursulin]

On 08/06/2018 22:35, Chris Wilson wrote:
> guc also uses timer-based sampling and cannot reliably hit our accuracy
> requirements for the test, so skip.

We also have an open ticket asking from GuC FW to implement something to 
allow us to keep non-sampling/accurate mode. From that angle it is good 
to have these few tests failing as a reminder that needs to be done. So 
I'd rather we don't sweep it under the rug.

Regards,

Tvrtko

> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> ---
>   tests/perf_pmu.c | 13 ++++++++++++-
>   1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/perf_pmu.c b/tests/perf_pmu.c
> index 4570f926d..61e83bf7b 100644
> --- a/tests/perf_pmu.c
> +++ b/tests/perf_pmu.c
> @@ -1507,6 +1507,17 @@ static void __rearm_spin_batch(igt_spin_t *spin)
>   #define assert_within(x, ref, tolerance) \
>   	__assert_within(x, ref, tolerance, tolerance)
>   
> +static bool uses_timer_sampling(int gem_fd)
> +{
> +	if (!gem_has_execlists(gem_fd))
> +		return true;
> +
> +	if (gem_has_guc_submission(gem_fd))
> +		return true;
> +
> +	return false;
> +}
> +
>   static void
>   accuracy(int gem_fd, const struct intel_execution_engine2 *e,
>   	 unsigned long target_busy_pct)
> @@ -1524,7 +1535,7 @@ accuracy(int gem_fd, const struct intel_execution_engine2 *e,
>   	int fd;
>   
>   	/* Sampling platforms cannot reach the high accuracy criteria. */
> -	igt_require(gem_has_execlists(gem_fd));
> +	igt_require(!uses_timer_sampling(gem_fd));
>   
>   	while (idle_us < 2500) {
>   		busy_us *= 2;
>