Quoting Chris Wilson (2019-11-28 12:55:02)
> +static void isolation(int i915)
> +{
> + for_each_mmap_offset_type(t) {
> + struct drm_i915_gem_mmap_offset mmap_arg = {
> + .flags = t->type
> + };
> + int A = gem_reopen_driver(i915);
> + int B = gem_reopen_driver(i915);
> + uint64_t offset_a, offset_b;
> + uint32_t a, b;
> + void *ptr;
> +
> + a = gem_create(A, 4096);
> + b = gem_open(B, gem_flink(A, a));
> +
> + mmap_arg.handle = a;
> + igt_assert_eq(mmap_offset_ioctl(i915, &mmap_arg), 0);
First ioctl should skip if type is not supported.
> + offset_a = mmap_arg.offset;
> +
> + mmap_arg.handle = b;
> + igt_assert_eq(mmap_offset_ioctl(i915, &mmap_arg), 0);
Then second must succeed.
-Chris
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