lib/dummyload: Add pollable spin batch

Pollable spin batch exports a spin->running pointer which can be checked
by dereferencing it to see if the spinner is actually executing on the
GPU.

This is useful for tests which want to make sure they do not proceed with
their next step whilst the spinner is potentially only being processed by
the driver and not actually executing.

Pollable spinner can be created with igt_spin_batch_new_poll or
__igt_spin_batch_new_poll, after which igt_spin_busywait_until_running can
be used to busy wait until it is executing.

v2:
 * Move READ_ONCE to igt_core.
 * Add igt_spin_busywait_until_running. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/ioctl_wrappers.h b/lib/ioctl_wrappers.h
index 13fbe3c1..b966f72c 100644
--- a/lib/ioctl_wrappers.h
+++ b/lib/ioctl_wrappers.h
@@ -61,6 +61,7 @@ bool gem_get_tiling(int fd, uint32_t handle, uint32_t *tiling, uint32_t *swizzle
 void gem_set_tiling(int fd, uint32_t handle, uint32_t tiling, uint32_t stride);
 int __gem_set_tiling(int fd, uint32_t handle, uint32_t tiling, uint32_t stride);
 
+int __gem_set_caching(int fd, uint32_t handle, uint32_t caching);
 void gem_set_caching(int fd, uint32_t handle, uint32_t caching);
 uint32_t gem_get_caching(int fd, uint32_t handle);
 uint32_t gem_flink(int fd, uint32_t handle);