[PATCH v4 1/5] drm/xe/topology: Add a function to find the index of the last DSS in a mask

[Harish Chegondi]

Signed-off-by: Harish Chegondi <harish.chegondi at intel.com>
---
 drivers/gpu/drm/xe/xe_gt_topology.c | 9 +++++++++
 drivers/gpu/drm/xe/xe_gt_topology.h | 3 +++
 2 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_gt_topology.c b/drivers/gpu/drm/xe/xe_gt_topology.c
index df2042db7ee6..1e7476f71906 100644
--- a/drivers/gpu/drm/xe/xe_gt_topology.c
+++ b/drivers/gpu/drm/xe/xe_gt_topology.c
@@ -278,6 +278,15 @@ xe_dss_mask_group_ffs(const xe_dss_mask_t mask, int groupsize, int groupnum)
 	return find_next_bit(mask, XE_MAX_DSS_FUSE_BITS, groupnum * groupsize);
 }
 
+/*
+ * Used to obtain the index of the last DSS.
+ */
+unsigned int
+xe_dss_mask_last_dss(const xe_dss_mask_t mask)
+{
+	return find_last_bit(mask, XE_MAX_DSS_FUSE_BITS);
+}
+
 bool xe_dss_mask_empty(const xe_dss_mask_t mask)
 {
 	return bitmap_empty(mask, XE_MAX_DSS_FUSE_BITS);
diff --git a/drivers/gpu/drm/xe/xe_gt_topology.h b/drivers/gpu/drm/xe/xe_gt_topology.h
index 746b325bbf6e..7ee022784397 100644
--- a/drivers/gpu/drm/xe/xe_gt_topology.h
+++ b/drivers/gpu/drm/xe/xe_gt_topology.h
@@ -28,6 +28,9 @@ void xe_gt_topology_dump(struct xe_gt *gt, struct drm_printer *p);
 unsigned int
 xe_dss_mask_group_ffs(const xe_dss_mask_t mask, int groupsize, int groupnum);
 
+unsigned int
+xe_dss_mask_last_dss(const xe_dss_mask_t mask);
+
 bool xe_dss_mask_empty(const xe_dss_mask_t mask);
 
 bool
-- 
2.45.1