From ea274cbeaf8f0667267b347e3f84797439cdab4e Mon Sep 17 00:00:00 2001 From: Babu Moger Date: Fri, 5 Sep 2025 16:34:23 -0500 Subject: fs/resctrl: Add event configuration directory under info/L3_MON/ The "mbm_event" counter assignment mode allows the user to assign a hardware counter to an RMID, event pair and monitor the bandwidth as long as it is assigned. The user can specify the memory transaction(s) for the counter to track. When this mode is supported, the /sys/fs/resctrl/info/L3_MON/event_configs directory contains a sub-directory for each MBM event that can be assigned to a counter. The MBM event sub-directory contains a file named "event_filter" that is used to view and modify which memory transactions the MBM event is configured with. Create /sys/fs/resctrl/info/L3_MON/event_configs directory on resctrl mount and pre-populate it with directories for the two existing MBM events: mbm_total_bytes and mbm_local_bytes. Create the "event_filter" file within each MBM event directory with the needed *show() that displays the memory transactions with which the MBM event is configured. Example: $ mount -t resctrl resctrl /sys/fs/resctrl $ cd /sys/fs/resctrl/ $ cat info/L3_MON/event_configs/mbm_total_bytes/event_filter local_reads,remote_reads,local_non_temporal_writes, remote_non_temporal_writes,local_reads_slow_memory, remote_reads_slow_memory,dirty_victim_writes_all $ cat info/L3_MON/event_configs/mbm_local_bytes/event_filter local_reads,local_non_temporal_writes,local_reads_slow_memory Signed-off-by: Babu Moger Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Reinette Chatre Link: https://lore.kernel.org/cover.1757108044.git.babu.moger@amd.com --- include/linux/resctrl_types.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux') diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h index d98351663c2c..acfe07860b34 100644 --- a/include/linux/resctrl_types.h +++ b/include/linux/resctrl_types.h @@ -34,6 +34,9 @@ /* Max event bits supported */ #define MAX_EVT_CONFIG_BITS GENMASK(6, 0) +/* Number of memory transactions that an MBM event can be configured with */ +#define NUM_MBM_TRANSACTIONS 7 + /* Event IDs */ enum resctrl_event_id { /* Must match value of first event below */ -- cgit v1.2.3