[PATCH v6 15/40] arm_mpam: resctrl: Pick the caches we will use as resctrl resources

[Gavin Shan]

On 3/14/26 12:45 AM, Ben Horgan wrote:
> From: James Morse <james.morse at arm.com>
> 
> Systems with MPAM support may have a variety of control types at any point
> of their system layout. We can only expose certain types of control, and
> only if they exist at particular locations.
> 
> Start with the well-known caches. These have to be depth 2 or 3 and support
> MPAM's cache portion bitmap controls, with a number of portions fewer than
> resctrl's limit.
> 
> 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>
> Reviewed-by: Jonathan Cameron <jonathan.cameron at huawei.com>
> Signed-off-by: James Morse <james.morse at arm.com>
> Signed-off-by: Ben Horgan <ben.horgan at arm.com>
> ---
> Changes since rfc:
> Jonathan:
> Remove brackets
> Compress debug message
> Use temp var, r
> 
> Changes since v2:
> Return -EINVAL in mpam_resctrl_control_init() for unknown rid
> 
> Changes since v4:
> Set alloc_capable after other settings (Reinette)
> 
> Changes since v5:
> Missing 'have' in comment
> Set cdp_capable to true for L2 and L3
> ---
>   drivers/resctrl/mpam_resctrl.c | 91 +++++++++++++++++++++++++++++++++-
>   1 file changed, 89 insertions(+), 2 deletions(-)
> 

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