Quoting Janusz Krzysztofik (2020-01-31 13:12:34)
> Creating a mapping to a userptr backed GEM object may cause a currently
> unavoidable lockdep splat inside the i915 driver. Then, such operation
> is expected to fail to prevent from that badness to happen.
>
> Add a respective subtest for each mapping type.
>
> Signed-off-by: Janusz Krzysztofik <janusz.krzyszto...@linux.intel.com>
> Cc: Matthew Auld <matthew.a...@intel.com>
> Cc: Chris Wilson <ch...@chris-wilson.co.uk>
> ---
> tests/i915/gem_mmap_offset.c | 55 ++++++++++++++++++++++++++++++++++++
> 1 file changed, 55 insertions(+)
>
> diff --git a/tests/i915/gem_mmap_offset.c b/tests/i915/gem_mmap_offset.c
> index 7c4088cdf..a5f28328b 100644
> --- a/tests/i915/gem_mmap_offset.c
> +++ b/tests/i915/gem_mmap_offset.c
> @@ -141,6 +141,36 @@ static void bad_extensions(int i915)
> gem_close(i915, arg.handle);
> }
>
> +static bool has_userptr(int i915)
> +{
> + uint32_t handle = 0;
> + void *ptr;
> +
> + igt_assert_eq(posix_memalign(&ptr, 4096, 4096), 0);
> + if (__gem_userptr(i915, ptr, 4096, 0, 0, &handle) == 0)
> + gem_close(i915, handle);
> + free(ptr);
> +
> + return handle;
> +}
> +
> +static void userptr(int i915, uint64_t flags)
> +{
> + struct drm_i915_gem_mmap_offset arg = {
> + .flags = flags,
> + };
> + void *ptr;
> +
> + igt_assert_eq(posix_memalign(&ptr, 4096, 4096), 0);
> +
> + gem_userptr(i915, ptr, 4096, 0, 0, &arg.handle);
> +
> + igt_assert_eq(mmap_offset_ioctl(i915, &arg), -EINVAL);
Not quite. The only reason it doesn't work is because the implementation
ties itself into knots, not that it is meant to not work. :|
-Chris
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