drm/radeon: add new getparam for number of backends.
This allows userspace to work out how many DBs there are
for conditional rendering to work.
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 4057ebf..68a7b22 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -205,6 +205,17 @@
/* return clock value in KHz */
value = rdev->clock.spll.reference_freq * 10;
break;
+ case RADEON_INFO_NUM_BACKENDS:
+ if (rdev->family >= CHIP_CEDAR)
+ value = rdev->config.evergreen.max_backends;
+ else if (rdev->family >= CHIP_RV770)
+ value = rdev->config.rv770.max_backends;
+ else if (rdev->family >= CHIP_R600)
+ value = rdev->config.r600.max_backends;
+ else {
+ return -EINVAL;
+ }
+ break;
default:
DRM_DEBUG_KMS("Invalid request %d\n", info->request);
return -EINVAL;
