[PATCH i-g-t 1/2] panthor: Return size from PANTHOR_DEV_QUERY

[Deborah Brouwer <deborah.brouwer@collabora.com>]

The size of the type being queried will be updated by the kernel driver
when the user pointer is null. Return the query size so that we can check
that it was correctly calculated.

Signed-off-by: Deborah Brouwer <deborah.brouwer@collabora.com>
---
 lib/igt_panthor.c | 6 +++++-
 lib/igt_panthor.h | 2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/igt_panthor.c b/lib/igt_panthor.c
index 11d8ec342..5aca0a020 100644
--- a/lib/igt_panthor.c
+++ b/lib/igt_panthor.c
@@ -178,8 +178,10 @@ void igt_panthor_group_submit_simple(int fd, uint32_t group_handle,
  * @err: expected error code, or 0 for success
  *
  * Query GPU information.
+ *
+ * Returns: the size of the type being queried.
  */
-void igt_panthor_query(int fd, int32_t type, void *data, size_t size, int err)
+uint32_t igt_panthor_query(int fd, int32_t type, void *data, size_t size, int err)
 {
 	struct drm_panthor_dev_query query = {
 		.type = type,
@@ -191,6 +193,8 @@ void igt_panthor_query(int fd, int32_t type, void *data, size_t size, int err)
 		do_ioctl_err(fd, DRM_IOCTL_PANTHOR_DEV_QUERY, &query, err);
 	else
 		do_ioctl(fd, DRM_IOCTL_PANTHOR_DEV_QUERY, &query);
+
+	return query.size;
 }
 
 /**
diff --git a/lib/igt_panthor.h b/lib/igt_panthor.h
index ba4a9bf1e..2ecce57de 100644
--- a/lib/igt_panthor.h
+++ b/lib/igt_panthor.h
@@ -16,7 +16,7 @@ struct panthor_bo {
 	void *map;
 };
 
-void igt_panthor_query(int fd, int32_t type, void *data, size_t size, int err);
+uint32_t igt_panthor_query(int fd, int32_t type, void *data, size_t size, int err);
 void igt_panthor_vm_create_userva_range(int fd, uint32_t *vm_id, int err, uint64_t *uva_range);
 void igt_panthor_vm_destroy(int fd, uint32_t vm_id, int err);
 void igt_panthor_vm_bind_offset(int fd, uint32_t vm_id, uint32_t bo_handle, uint64_t va,

-- 
2.56.0