fs/resctrl: Add the functionality to assign MBM events

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When supported, "mbm_event" counter assignment mode offers "num_mbm_cntrs"
number of counters that can be assigned to RMID, event pairs and monitor
bandwidth usage as long as it is assigned.

Add the functionality to allocate and assign a counter to an RMID, event
pair in the domain. Also, add the helper rdtgroup_assign_cntrs() to assign
counters in the group.

Log the error message "Failed to allocate counter for <event> in domain
<id>" in /sys/fs/resctrl/info/last_cmd_status if all the counters are in
use. Exit on the first failure when assigning counters across all the
domains.

Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/cover.1757108044.git.babu.moger@amd.com

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This commit is contained in:

Babu Moger 2025-09-05 16:34:16 -05:00 • committed by Borislav Petkov (AMD)

parent f7a4fb2231

commit bd85310efd

2 changed files with 158 additions and 0 deletions

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fs/resctrl/internal.h

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156

fs/resctrl/monitor.c

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