Quoting Chris Wilson (2020-04-02 15:00:57)
> Feed a fresh i915 mmap into a read(perf_fd) to teach lockdep about the
> potential lock chains should we take a pagefault into our vm_fault
> handlers from within perf.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> ---
> tests/perf_pmu.c | 39 +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 39 insertions(+)
>
> diff --git a/tests/perf_pmu.c b/tests/perf_pmu.c
> index 259670f4b..1d6681d80 100644
> --- a/tests/perf_pmu.c
> +++ b/tests/perf_pmu.c
> @@ -1827,6 +1827,35 @@ accuracy(int gem_fd, const struct intel_execution_engine2 *e,
> assert_within(100.0 * busy_r, 100.0 * expected, 2);
> }
>
> +static void *create_mmap(int gem_fd, const struct mmap_offset *t, int sz)
> +{
> + uint32_t handle;
> + void *ptr;
> +
> + handle = gem_create(gem_fd, sz);
> + ptr = __gem_mmap_offset(gem_fd, handle, 0, sz, PROT_WRITE, t->type);
> + gem_close(gem_fd, handle);
> +
> + return ptr;
> +}
> +
> +static void
> +faulting_read(int gem_fd, const struct mmap_offset *t)
> +{
> + void *ptr;
> + int fd;
> +
> + ptr = create_mmap(gem_fd, t, 4096);
> + igt_require(ptr != NULL);
> +
> + fd = open_pmu(gem_fd, I915_PMU_ENGINE_BUSY(0, 0));
> + igt_require(fd != -1);
> + igt_assert_eq(read(fd, ptr, 4096), 2 * sizeof(uint64_t));
> + close(fd);
> +
> + munmap(ptr, 4096);
> +}
> +
> #define test_each_engine(T, i915, e) \
> igt_subtest_with_dynamic(T) __for_each_physical_engine(i915, e) \
> igt_dynamic_f("%s", e->name)
> @@ -1860,6 +1889,16 @@ igt_main
> igt_subtest("invalid-init")
> invalid_init(fd);
>
> + igt_subtest_with_dynamic("faulting-read") {
> + for_each_mmap_offset_type(fd, t) {
> + if (!gem_has_mmap_offset_type(fd, t))
> + continue;
Redundant, for_each_mmap_offset_type() includes the skip.
-Chris
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
