From a2d6f86bbcb497f8e28795a3e4d27861dea020df Mon Sep 17 00:00:00 2001 From: Harish Chegondi Date: Tue, 25 Feb 2025 17:47:05 -0800 Subject: [PATCH] drm/xe/topology: Add a function to find the index of the last enabled DSS in a mask Last enabled DSS in a DSS mask can help estimate the maximum DSSes enabled in the DSS mask, as the enabled DSSes can be discontiguous. Reviewed-by: Ashutosh Dixit Signed-off-by: Harish Chegondi Signed-off-by: Ashutosh Dixit Link: https://patchwork.freedesktop.org/patch/msgid/79944bb27eb4f7ce5df01f964aebbf431b3a6c61.1740533885.git.harish.chegondi@intel.com --- drivers/gpu/drm/xe/xe_gt_topology.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/gpu/drm/xe/xe_gt_topology.h b/drivers/gpu/drm/xe/xe_gt_topology.h index 746b325bbf6e..a72d26ba0653 100644 --- a/drivers/gpu/drm/xe/xe_gt_topology.h +++ b/drivers/gpu/drm/xe/xe_gt_topology.h @@ -25,6 +25,19 @@ void xe_gt_topology_init(struct xe_gt *gt); void xe_gt_topology_dump(struct xe_gt *gt, struct drm_printer *p); +/** + * xe_gt_topology_mask_last_dss() - Returns the index of the last DSS in a mask. + * @mask: Input DSS mask + * + * Return: Index of the last DSS in the input DSS mask, + * XE_MAX_DSS_FUSE_BITS if DSS mask is empty. + */ +static inline unsigned int +xe_gt_topology_mask_last_dss(const xe_dss_mask_t mask) +{ + return find_last_bit(mask, XE_MAX_DSS_FUSE_BITS); +} + unsigned int xe_dss_mask_group_ffs(const xe_dss_mask_t mask, int groupsize, int groupnum); -- 2.25.1