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| author | Babu Moger <babu.moger@amd.com> | 2025-09-05 16:34:07 -0500 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2025-09-15 12:08:01 +0200 |
| commit | 13390861b426e936db20d675804a5b405622bc79 (patch) | |
| tree | 580d5eb66541241dfe44fc4f91319e6a469d6883 /fs/resctrl | |
| parent | x86,fs/resctrl: Consolidate monitoring related data from rdt_resource (diff) | |
| download | linux-13390861b426e936db20d675804a5b405622bc79.tar.gz linux-13390861b426e936db20d675804a5b405622bc79.zip | |
x86,fs/resctrl: Detect Assignable Bandwidth Monitoring feature details
ABMC feature details are reported via CPUID Fn8000_0020_EBX_x5.
Bits Description
15:0 MAX_ABMC Maximum Supported Assignable Bandwidth
Monitoring Counter ID + 1
The ABMC feature details are documented in APM [1] available from [2].
[1] AMD64 Architecture Programmer's Manual Volume 2: System Programming
Publication # 24593 Revision 3.41 section 19.3.3.3 Assignable Bandwidth
Monitoring (ABMC).
Detect the feature and number of assignable counters supported. For backward
compatibility, upon detecting the assignable counter feature, enable the
mbm_total_bytes and mbm_local_bytes events that users are familiar with as
part of original L3 MBM support.
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
Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 # [2]
Diffstat (limited to 'fs/resctrl')
| -rw-r--r-- | fs/resctrl/monitor.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c index e0dfa5fb969e..b578451de2b5 100644 --- a/fs/resctrl/monitor.c +++ b/fs/resctrl/monitor.c @@ -922,6 +922,13 @@ int resctrl_mon_resource_init(void) else if (resctrl_is_mon_event_enabled(QOS_L3_MBM_TOTAL_EVENT_ID)) mba_mbps_default_event = QOS_L3_MBM_TOTAL_EVENT_ID; + if (r->mon.mbm_cntr_assignable) { + if (!resctrl_is_mon_event_enabled(QOS_L3_MBM_TOTAL_EVENT_ID)) + resctrl_enable_mon_event(QOS_L3_MBM_TOTAL_EVENT_ID); + if (!resctrl_is_mon_event_enabled(QOS_L3_MBM_LOCAL_EVENT_ID)) + resctrl_enable_mon_event(QOS_L3_MBM_LOCAL_EVENT_ID); + } + return 0; } |