Some comments below.
> + struct radeon_device *rdev = dev->dev_private;
> + struct drm_gem_object *gobj;
> + struct radeon_bo *robj;
> + void *buffer_data;
> + uint32_t *fence_data;
> + int r = 0;
> + long timeout;
> + int ring = RADEON_RING_TYPE_GFX_INDEX;
> +
> + /* If you're implementing this for other rings, you'll want to
> share
> + code with radeon_cs_get_ring in radeon_cs.c */
> + if (args->ring != RADEON_CS_RING_GFX) {
> + return -EINVAL;
> + }
> +
> + gobj = drm_gem_object_lookup(dev, filp, args->handle);
> + if (gobj == NULL) {
> + return -ENOENT;
> + }
> + robj = gem_to_radeon_bo(gobj);
> +
> + if (gobj->size < args->offset) {
> + r = -EINVAL;
> + goto unreference;
> + }
> +
> + r = radeon_bo_reserve(robj, true);
> + if (r) {
> + goto unreference;
> + }
> +
> + r = radeon_bo_pin(robj, RADEON_GEM_DOMAIN_GTT, NULL);
> + if (r) {
> + goto unreserve;
> + }
> +
> + r = radeon_bo_kmap(robj, &buffer_data);
> + if (r) {
> + goto unpin;
> + }
> +
Do you need to pin it? I think if you have it reserved and you are in here you shouldn't need to. (unless kmapping requires a pin)/
> + radeon_irq_kms_sw_irq_get(rdev, ring);
> +
> + fence_data = (uint32_t*)buffer_data;
> + timeout =
> an
> + * interrupt and the value in the buffer might have changed.
> + */
> +struct drm_radeon_gem_wait_user_fence {
> + uint32_t handle;
> + uint32_t ring;
> + uint64_t offset;
> + uint32_t value;
> + uint64_t timeout_usec;
Align things here, 64 then 64 then 32 32 32 and a 32 pad.
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