Hi Babu,
On 8/6/24 3:00 PM, Babu Moger wrote:
In ABMC mode, the hardware counter should be assigned to read the MBM
events.
Report "Unassigned" in case the user attempts to read the events without
assigning the counter.
Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
---
v6: Added more explaination in the resctrl.rst
Added checks to detect "Unassigned" before reading RMID.
v5: New patch.
---
Documentation/arch/x86/resctrl.rst | 11 +++++++++++
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 13 ++++++++++++-
2 files changed, 23 insertions(+), 1 deletion(-)
diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index fe9f10766c4f..aea440ee6107 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -294,6 +294,17 @@ with the following files:
"num_mbm_cntrs":
The number of monitoring counters available for assignment.
+ Resctrl subsystem provides the interface to count maximum of two
+ MBM events per group, from a combination of total and local events.
+ Keeping the current interface, users can assign a maximum of two
+ monitoring counters per group. User will also have the option to
+ enable only one counter to the group.
+
+ With limited number of counters, system can run out of assignable counters.
+ In mbm_cntr_assign mode, the MBM event counters will return "Unassigned" if
+ the counter is not assigned to the event when read. Users need to assign a
+ counter manually to read the events.
This seems more appropriate for the "mon_data" section.
Reinette
