[PATCH v8 1/7] drm/xe/topology: Add a function to find the index of the last enabled DSS in a mask

[Dixit, Ashutosh]

On Wed, 15 Jan 2025 12:02:07 -0800, Harish Chegondi wrote:
>
> 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.
>
> Signed-off-by: Harish Chegondi <harish.chegondi at 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

u32?

> +xe_gt_topology_mask_last_dss(const xe_dss_mask_t mask)
> +{
> +	return find_last_bit(mask, XE_MAX_DSS_FUSE_BITS);
> +}
> +

The convention here seems to be to keep function definitions in .c and
declarations in .h?

>  unsigned int
>  xe_dss_mask_group_ffs(const xe_dss_mask_t mask, int groupsize, int groupnum);
>
> --
> 2.47.1
>