The kernel must not return stale information back to userspace when they create a new object. For that purpose, we always clear objects on creation, so verify that this is so.
Signed-off-by: Chris Wilson <[email protected]> Cc: Matthew Auld <[email protected]> --- tests/i915/gem_create.c | 71 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) diff --git a/tests/i915/gem_create.c b/tests/i915/gem_create.c index 25c5e8088..9de2263d5 100644 --- a/tests/i915/gem_create.c +++ b/tests/i915/gem_create.c @@ -44,6 +44,7 @@ #include <sys/stat.h> #include <sys/time.h> #include <getopt.h> +#include <pthread.h> #include <drm.h> @@ -141,6 +142,73 @@ static void invalid_nonaligned_size(int fd) gem_close(fd, handle); } +static uint64_t get_npages(uint64_t *global, uint64_t npages) +{ + uint64_t try, old, max; + + max = *global; + do { + old = max; + try = npages % (max / 2); + max -= try; + } while ((max = __sync_val_compare_and_swap(global, old, max)) != old); + + return try; +} + +struct thread_clear { + uint64_t max; + int timeout; + int i915; +}; + +static void *thread_clear(void *data) +{ + struct thread_clear *arg = data; + int i915 = arg->i915; + + igt_until_timeout(arg->timeout) { + uint32_t handle; + uint64_t npages; + + npages = random(); + npages <<= 32; + npages |= random(); + npages = get_npages(&arg->max, npages); + + handle = gem_create(i915, npages << 12); + for (uint64_t page = 0; page < npages; page++) { + uint64_t x; + + gem_read(i915, handle, + page % (4096 - sizeof(x)), + &x, sizeof(x)); + igt_assert_eq_u64(x, 0); + } + gem_close(i915, handle); + + __sync_add_and_fetch(&arg->max, npages); + } + + return NULL; +} + +static void always_clear(int i915, int timeout) +{ + struct thread_clear arg = { + .i915 = i915, + .timeout = timeout, + .max = intel_get_avail_ram_mb() << (20 - 12), /* in pages */ + }; + const int ncpus = sysconf(_SC_NPROCESSORS_ONLN); + pthread_t thread[ncpus]; + + for (int i = 0; i < ncpus; i++) + pthread_create(&thread[i], NULL, thread_clear, &arg); + for (int i = 0; i < ncpus; i++) + pthread_join(thread[i], NULL); +} + igt_main { int fd = -1; @@ -162,4 +230,7 @@ igt_main igt_subtest("create-invalid-nonaligned") invalid_nonaligned_size(fd); + + igt_subtest("create-clear") + always_clear(fd, 30); } -- 2.20.1 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
