diff options
| author | Babu Moger <babu.moger@amd.com> | 2025-09-05 16:34:31 -0500 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2025-09-15 12:52:04 +0200 |
| commit | 0f1576e43adc62756879a240e66e89ce386b6eb9 (patch) | |
| tree | 7d796f72b2f760d4322f417e0ddc55522e593460 /arch/x86/kernel/cpu/resctrl/monitor.c | |
| parent | 8004ea01cf6338298e0c6ab055bc3ec659ce381b (diff) | |
x86/resctrl: Configure mbm_event mode if supported
Configure mbm_event mode on AMD platforms. On AMD platforms, it is
recommended to use the mbm_event mode, if supported, to prevent the
hardware from resetting counters between reads. This can result in
misleading values or display "Unavailable" if no counter is assigned
to the event.
Enable mbm_event mode, known as ABMC (Assignable Bandwidth Monitoring
Counters) on AMD, by default if the system supports it.
Update ABMC across all logical processors within the resctrl domain to
ensure proper functionality.
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
Diffstat (limited to 'arch/x86/kernel/cpu/resctrl/monitor.c')
| -rw-r--r-- | arch/x86/kernel/cpu/resctrl/monitor.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c index 0b3c199e9e01..c8945610d455 100644 --- a/arch/x86/kernel/cpu/resctrl/monitor.c +++ b/arch/x86/kernel/cpu/resctrl/monitor.c @@ -456,6 +456,7 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r) r->mon.mbm_cntr_assignable = true; cpuid_count(0x80000020, 5, &eax, &ebx, &ecx, &edx); r->mon.num_mbm_cntrs = (ebx & GENMASK(15, 0)) + 1; + hw_res->mbm_cntr_assign_enabled = true; } r->mon_capable = true; @@ -557,3 +558,10 @@ void resctrl_arch_config_cntr(struct rdt_resource *r, struct rdt_mon_domain *d, if (am) memset(am, 0, sizeof(*am)); } + +void resctrl_arch_mbm_cntr_assign_set_one(struct rdt_resource *r) +{ + struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r); + + resctrl_abmc_set_one_amd(&hw_res->mbm_cntr_assign_enabled); +} |