[PATCH v6 23/40] arm_mpam: resctrl: Add rmid index helpers

[Gavin Shan]

On 3/14/26 12:46 AM, Ben Horgan wrote:
> Because MPAM's pmg aren't identical to RDT's rmid, resctrl handles some
> data structures by index. This allows x86 to map indexes to RMID, and MPAM
> to map them to partid-and-pmg.
> 
> Add the helpers to do this.
> 
> Tested-by: Gavin Shan <gshan at redhat.com>
> Tested-by: Shaopeng Tan <tan.shaopeng at jp.fujitsu.com>
> Tested-by: Peter Newman <peternewman at google.com>
> Tested-by: Zeng Heng <zengheng4 at huawei.com>
> Tested-by: Punit Agrawal <punit.agrawal at oss.qualcomm.com>
> Reviewed-by: Zeng Heng <zengheng4 at huawei.com>
> Reviewed-by: Shaopeng Tan <tan.shaopeng at jp.fujitsu.com>
> Suggested-by: James Morse <james.morse at arm.com>
> Reviewed-by: Jonathan Cameron <jonathan.cameron at huawei.com>
> Signed-off-by: Ben Horgan <ben.horgan at arm.com>
> ---
> Changes since rfc:
> Use ~0U instead of ~0 in lhs of left shift
> 
> Changes since v2:
> Drop changes signed-off-by as reworked patch
> Use multiply and add rather than shift to avoid holes
> ---
>   drivers/resctrl/mpam_resctrl.c | 16 ++++++++++++++++
>   include/linux/arm_mpam.h       |  3 +++
>   2 files changed, 19 insertions(+)
> 

Reviewed-by: Gavin Shan <gshan at redhat.com>