drm/radeon: Refuse to migrate a prime BO to VRAM. (v2)
BOs shared via dma-buf, either imported or exported, cannot sensibly be migrated to VRAM
without breaking the dma-buf sharing. Refuse userspace requests to migrate to VRAM,
ensure such BOs are not migrated during command submission, and refuse to pin them
to VRAM.
v2: Don't pin BOs in GTT. Instead, refuse to migrate BOs to VRAM.
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christopher James Halse Rogers <christopher.halse.rogers@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
index a8442f7..df6b58c 100644
--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -164,6 +164,16 @@ static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
p->relocs[i].allowed_domains = domain;
}
+ /* Objects shared as dma-bufs cannot be moved to VRAM */
+ if (p->relocs[i].robj->prime_shared_count) {
+ p->relocs[i].allowed_domains &= ~RADEON_GEM_DOMAIN_VRAM;
+ if (!p->relocs[i].allowed_domains) {
+ DRM_ERROR("BO associated with dma-buf cannot "
+ "be moved to VRAM\n");
+ return -EINVAL;
+ }
+ }
+
p->relocs[i].tv.bo = &p->relocs[i].robj->tbo;
p->relocs[i].tv.shared = !r->write_domain;