Re: [I-G-T 2/3] igt/gem_mocs_settings: adding RC6 tests

[Peter Antoine <peter.antoine@intel.com>]

On Mon, 1 Aug 2016, Chris Wilson wrote:

> On Fri, Jul 29, 2016 at 10:34:35AM +0100, Peter Antoine wrote:
>> This change adds a RC6 test for the MOCS. The MOCS registers are loaded
>> and saved as part of the RC6 cycle but not all the registers are
>> saved/restored. This tests that those registers are correctly restored.
>>
>> Signed-off-by: Peter Antoine <peter.antoine@intel.com>
>> ---
>>  tests/gem_mocs_settings.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 56 insertions(+)
>>
>> diff --git a/tests/gem_mocs_settings.c b/tests/gem_mocs_settings.c
>> index 4fb3a02..66d02d9 100644
>> --- a/tests/gem_mocs_settings.c
>> +++ b/tests/gem_mocs_settings.c
>> @@ -518,6 +518,59 @@ static void run_tests(unsigned mode)
>>  	intel_register_access_fini();
>>  }
>>
>> +static unsigned int readit(const char *path)
>> +{
>> +	unsigned int ret = 0;
>> +	int scanned = 0;
>> +	FILE *file;
>> +
>> +	file = fopen(path, "r");
>> +	igt_assert(file);
>> +	scanned = fscanf(file, "%u", &ret);
>> +	igt_assert_eq(scanned, 1);
>> +
>> +	fclose(file);
>> +
>> +	return ret;
>> +}
>> +
>> +static int read_rc6_residency(void)
>> +{
>> +	unsigned int residency;
>> +	const int device = drm_get_card();
>> +	static const char path_format[] =
>> +				"/sys/class/drm/card%d/power/rc6_residency_ms";
>> +	char path[sizeof(path_format)];
>> +	int  ret;
>> +
>> +	ret = snprintf(path, sizeof(path)-1, path_format, device);
>> +
>> +	igt_assert_neq(ret, -1);
>> +	residency = readit(path);
>
> This is duplicating code from igt_sysfs.c

PS: Not in the current tree. The code is based on code from 
pm_rc6_residency.

>
>> +
>> +	return residency;
>> +}
>> +
>> +static void context_rc6_test(void)
>> +{
>> +	int fd = drm_open_driver(DRIVER_INTEL);
>> +	int res_ms;
>> +	uint32_t ctx_id = gem_context_create(fd);
>> +
>> +	igt_debug("RC6 Context Test\n");
>> +	check_control_registers(fd, I915_EXEC_RENDER, ctx_id, false);
>> +	check_l3cc_registers(fd, I915_EXEC_RENDER, ctx_id, false);
>> +
>> +	res_ms = read_rc6_residency();
>> +	sleep(3);
>
> Still a large and arbitrary delay.
>
>> +	igt_assert_neq(res_ms, read_rc6_residency());
>
> Still an assert rather than skipping when the user has disabled rc6.
> -Chris
>
>

--
    Peter Antoine (Android Graphics Driver Software Engineer)
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