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 <chris@xxxxxxxxxxxxxxxxxx>
Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
---
tests/i915/gem_create.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/tests/i915/gem_create.c b/tests/i915/gem_create.c
index 25c5e8088..9d1a4af4f 100644
--- a/tests/i915/gem_create.c
+++ b/tests/i915/gem_create.c
@@ -141,6 +141,32 @@ static void invalid_nonaligned_size(int fd)
gem_close(fd, handle);
}
+static void always_clear(int i915, int timeout)
+{
+ uint64_t max = intel_get_avail_ram_mb() << (20 - 12); /* in pages */
+
+ igt_until_timeout(timeout) {
+ uint64_t npages;
+ uint32_t handle;
+
+ npages = random();
+ npages <<= 32;
+ npages |= random();
+ npages %= max;
+
+ 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);
+ }
+}
+
igt_main
{
int fd = -1;
@@ -162,4 +188,7 @@ igt_main
igt_subtest("create-invalid-nonaligned")
invalid_nonaligned_size(fd);
+
+ igt_subtest("create-clear")
+ always_clear(fd, 30);
}
--
2.20.1
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