Hi Babu, On 8/14/25 7:25 PM, Babu Moger wrote: > Introduce the resctrl file "mbm_assign_mode" to list the supported counter > assignment modes. > > The "mbm_event" counter assignment mode allows users to assign a hardware > counter to an RMID, event pair and monitor bandwidth usage as long as it is > assigned. The hardware continues to track the assigned counter until it is > explicitly unassigned by the user. Each event within a resctrl group can be > assigned independently in this mode. > > On AMD systems "mbm_event" mode is backed by the ABMC (Assignable > Bandwidth Monitoring Counters) hardware feature and is enabled by default. > > The "default" mode is the existing mode that works without the explicit > counter assignment, instead relying on dynamic counter assignment by > hardware that may result in hardware not dedicating a counter resulting > in monitoring data reads returning "Unavailable". > > Provide an interface to display the monitor modes on the system. > > $ cat /sys/fs/resctrl/info/L3_MON/mbm_assign_mode > [mbm_event] > default > > Add IS_ENABLED(CONFIG_RESCTRL_ASSIGN_FIXED) check to support Arm64. > > On x86, CONFIG_RESCTRL_ASSIGN_FIXED is not defined. On Arm64, it will be > defined when the "mbm_event" mode is supported. > > Add IS_ENABLED(CONFIG_RESCTRL_ASSIGN_FIXED) check early to ensure the user > interface remains compatible with upcoming Arm64 support. IS_ENABLED() > safely evaluates to 0 when the configuration is not defined. > > As a result, for MPAM, the display would be either: > [default] > or > [mbm_event] > > Signed-off-by: Babu Moger <babu.moger@xxxxxxx> > --- Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx> Reinette
