[igt-dev] [PATCH i-g-t v3 3/3] tests/xe_spin_batch: spin-fixed-duration

[Zbigniew Kempczyński]

On Tue, Sep 05, 2023 at 03:02:25PM +0000, Marcin Bernatowicz wrote:
> Basic test for xe_spin with fixed duration.
> 
> v2: Added assert for expected spinner duration. (Zbyszek)
> A median of 5x100ms spins duration is computed, which should
> satisfy CI runs, although better accuracy is achieved with
> disabled logging (echo 0 > /sys/module/drm/parameters/debug).
> 
> Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz at linux.intel.com>
> ---
>  tests/intel/xe_spin_batch.c | 72 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 72 insertions(+)
> 
> diff --git a/tests/intel/xe_spin_batch.c b/tests/intel/xe_spin_batch.c
> index 26f9daf36..6dcd89558 100644
> --- a/tests/intel/xe_spin_batch.c
> +++ b/tests/intel/xe_spin_batch.c
> @@ -1,8 +1,10 @@
>  #include "igt.h"
> +#include "igt_syncobj.h"
>  #include "lib/intel_reg.h"
>  #include "xe_drm.h"
>  #include "xe/xe_ioctl.h"
>  #include "xe/xe_query.h"
> +#include "xe/xe_spin.h"
>  
>  /**
>   * TEST: Tests for spin batch submissons.
> @@ -138,6 +140,73 @@ static void spin_all(int fd, int gt, int class)
>  	xe_vm_destroy(fd, vm);
>  }
>  
> +/**
> + * SUBTEST: spin-fixed-duration
> + * Description: Basic test which validates the functionality of xe_spin with fixed duration.
> + * Run type: FULL
> + */
> +static void xe_spin_fixed_duration(int fd)
> +{
> +	uint64_t ahnd;
> +	uint32_t vm;
> +	unsigned int exec_queue;
> +	uint32_t bo;
> +	size_t bo_size;
> +	struct xe_spin *spin;
> +	uint64_t spin_addr;
> +	struct drm_xe_sync sync = {
> +		.handle = syncobj_create(fd, 0),
> +		.flags = DRM_XE_SYNC_SYNCOBJ | DRM_XE_SYNC_SIGNAL,
> +	};
> +	struct drm_xe_exec exec = {
> +		.num_batch_buffer = 1,
> +		.num_syncs = 1,
> +		.syncs = to_user_pointer(&sync),
> +	};
> +	struct timespec tv;
> +	const uint64_t duration_ns = NSEC_PER_SEC / 10; /* 100ms */
> +	double elapsed_ms;
> +	int i;
> +	igt_stats_t stats;

To be a little bit more neat you should keep longer lines first
with decreasing line length on variable declaration/definition
part. I would also suggest to group by type if possible.

Regardless this nit:

Reviewed-by: Zbigniew Kempczyński <zbigniew.kempczynski at intel.com>

--
Zbigniew

> +
> +	vm = xe_vm_create(fd, 0, 0);
> +	exec_queue = xe_exec_queue_create_class(fd, vm, DRM_XE_ENGINE_CLASS_COPY);
> +	ahnd = intel_allocator_open(fd, 0, INTEL_ALLOCATOR_RELOC);
> +	bo_size = ALIGN(sizeof(*spin) + xe_cs_prefetch_size(fd), xe_get_default_alignment(fd));
> +	bo = xe_bo_create(fd, 0, vm, bo_size);
> +	spin = xe_bo_map(fd, bo, bo_size);
> +	spin_addr = intel_allocator_alloc_with_strategy(ahnd, bo, bo_size, 0, ALLOC_STRATEGY_LOW_TO_HIGH);
> +	xe_vm_bind_sync(fd, vm, bo, 0, spin_addr, bo_size);
> +	xe_spin_init_opts(spin, .addr = spin_addr,
> +				.preempt = true,
> +				.ctx_ticks = duration_to_ctx_ticks(fd, 0, duration_ns));
> +	exec.address = spin_addr;
> +	exec.exec_queue_id = exec_queue;
> +
> +#define NSAMPLES 5
> +	igt_stats_init_with_size(&stats, NSAMPLES);
> +	for (i = 0; i < NSAMPLES; ++i) {
> +		igt_gettime(&tv);
> +		xe_exec(fd, &exec);
> +		xe_spin_wait_started(spin);
> +		igt_assert(syncobj_wait(fd, &sync.handle, 1, INT64_MAX, 0, NULL));
> +		igt_stats_push_float(&stats, igt_nsec_elapsed(&tv) * 1e-6);
> +		syncobj_reset(fd, &sync.handle, 1);
> +		igt_debug("i=%d %.2fms\n", i, stats.values_f[i]);
> +	}
> +	elapsed_ms = igt_stats_get_median(&stats);
> +	igt_info("%.0fms spin took %.2fms (median)\n", duration_ns * 1e-6, elapsed_ms);
> +	igt_assert(elapsed_ms < duration_ns * 1.5e-6 && elapsed_ms > duration_ns * 0.5e-6);
> +
> +	xe_vm_unbind_sync(fd, vm, 0, spin_addr, bo_size);
> +	syncobj_destroy(fd, sync.handle);
> +	gem_munmap(spin, bo_size);
> +	gem_close(fd, bo);
> +	xe_exec_queue_destroy(fd, exec_queue);
> +	xe_vm_destroy(fd, vm);
> +	put_ahnd(ahnd);
> +}
> +
>  igt_main
>  {
>  	struct drm_xe_engine_class_instance *hwe;
> @@ -163,6 +232,9 @@ igt_main
>  				spin_all(fd, gt, class);
>  	}
>  
> +	igt_subtest("spin-fixed-duration")
> +		xe_spin_fixed_duration(fd);
> +
>  	igt_fixture
>  		drm_close_driver(fd);
>  }
> -- 
> 2.30.2
>