diff options
| author | Babu Moger <babu.moger@amd.com> | 2025-09-05 16:34:22 -0500 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2025-09-15 12:38:58 +0200 |
| commit | 159f36cd4de7718779fd0b232de5137b4ffd2d1e (patch) | |
| tree | 6216e9d9635bbbce71afd40097e87f58fffa0f49 /Documentation/filesystems | |
| parent | 2a65b72c1603a74f35228acbb8de2ecff9c13efe (diff) | |
| download | tip-159f36cd4de7718779fd0b232de5137b4ffd2d1e.tar.gz | |
fs/resctrl: Support counter read/reset with mbm_event assignment mode
When "mbm_event" counter assignment mode is enabled, the architecture requires
a counter ID to read the event data.
Introduce an is_mbm_cntr field in struct rmid_read to indicate whether counter
assignment mode is in use.
Update the logic to call resctrl_arch_cntr_read() and resctrl_arch_reset_cntr()
when the assignment mode is active. Report 'Unassigned' in case the user attempts
to read an event without assigning a hardware counter.
Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
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
Notes
SubmissionLink: https://lore.kernel.org/7dc53c86f6b75c8cc711e97c52c16de2fcd7869b.1757108044.git.babu.moger@amd.com
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/resctrl.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst index 446736dbd97f19..4c24c5f3f4c196 100644 --- a/Documentation/filesystems/resctrl.rst +++ b/Documentation/filesystems/resctrl.rst @@ -434,6 +434,12 @@ When monitoring is enabled all MON groups will also contain: for the L3 cache they occupy). These are named "mon_sub_L3_YY" where "YY" is the node number. + When the 'mbm_event' counter assignment mode is enabled, reading + an MBM event of a MON group returns 'Unassigned' if no hardware + counter is assigned to it. For CTRL_MON groups, 'Unassigned' is + returned if the MBM event does not have an assigned counter in the + CTRL_MON group nor in any of its associated MON groups. + "mon_hw_id": Available only with debug option. The identifier used by hardware for the monitor group. On x86 this is the RMID. |