1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 55d0b474bd37..21d593c0ecaf 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -461,6 +461,15 @@ int radeon_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
         case RADEON_INFO_SI_CP_DMA_COMPUTE:
                 *value = 1;
                 break;
+        case RADEON_INFO_SI_BACKEND_ENABLED_MASK:
+                if (rdev->family >= CHIP_BONAIRE) {
+                        *value = rdev->config.cik.backend_enable_mask;
+                } else if (rdev->family >= CHIP_TAHITI) {
+                        *value = rdev->config.si.backend_enable_mask;
+                } else {
+                        DRM_DEBUG_KMS("BACKEND_ENABLED_MASK is si+ only!\n");
+                }
+                break;
         default:
                 DRM_DEBUG_KMS("Invalid request %d\n", info->request);
                 return -EINVAL;