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drm/i915/selftests: Skip unstable timing measurements 

If any of the perf tests run into 0 time, not only are we liable to
divide by zero, but the result would be highly questionable.
Nevertheless, let's not have a div-by-zero error.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Andi Shyti <andi.shyti@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210108204026.20682-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2021-01-08 20:40:21 +00:00
parent 5b4dc95cf7
commit c318a203ea
1 changed files with 14 additions and 6 deletions
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20
drivers/gpu/drm/i915/selftests/intel_memory_region.c
View File

@ -852,14 +852,22 @@ static int _perf_memcpy(struct intel_memory_region *src_mr,
}
sort(t, ARRAY_SIZE(t), sizeof(*t), wrap_ktime_compare, NULL);
if (t[0] <= 0) {
/* ignore the impossible to protect our sanity */
pr_debug("Skipping %s src(%s, %s) -> dst(%s, %s) %14s %4lluKiB copy, unstable measurement [%lld, %lld]\n",
__func__,
src_mr->name, repr_type(src_type),
dst_mr->name, repr_type(dst_type),
tests[i].name, size >> 10,
t[0], t[4]);
continue;
}
pr_info("%s src(%s, %s) -> dst(%s, %s) %14s %4llu KiB copy: %5lld MiB/s\n",
__func__,
src_mr->name,
repr_type(src_type),
dst_mr->name,
repr_type(dst_type),
tests[i].name,
size >> 10,
src_mr->name, repr_type(src_type),
dst_mr->name, repr_type(dst_type),
tests[i].name, size >> 10,
div64_u64(mul_u32_u32(4 * size,
1000 * 1000 * 1000),
t[1] + 2 * t[2] + t[3]) >> 20);