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x86/resctrl: Enable RDT_RESOURCE_PERF_PKG

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Since telemetry events are enumerated on resctrl mount the RDT_RESOURCE_PERF_PKG
resource is not considered "monitoring capable" during early resctrl initialization.
This means that the domain list for RDT_RESOURCE_PERF_PKG is not built when the CPU
hotplug notifiers are registered and run for the first time right after resctrl
initialization.

Mark the RDT_RESOURCE_PERF_PKG as "monitoring capable" upon successful telemetry
event enumeration to ensure future CPU hotplug events include this resource and
initialize its domain list for CPUs that are already online.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/20251217172121.12030-1-tony.luck@intel.com
This commit is contained in:
Tony Luck
2026-01-08 09:42:27 -08:00
committed by Borislav Petkov (AMD)
parent d0891647fb
commit 4bbfc90122
2 changed files with 22 additions and 0 deletions
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16
arch/x86/kernel/cpu/resctrl/core.c
View File

@@ -766,8 +766,24 @@ static int resctrl_arch_offline_cpu(unsigned int cpu)
void resctrl_arch_pre_mount(void)
{
struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_PERF_PKG].r_resctrl;
int cpu;
if (!intel_aet_get_events())
return;
/*
* Late discovery of telemetry events means the domains for the
* resource were not built. Do that now.
*/
cpus_read_lock();
mutex_lock(&domain_list_lock);
r->mon_capable = true;
rdt_mon_capable = true;
for_each_online_cpu(cpu)
domain_add_cpu_mon(cpu, r);
mutex_unlock(&domain_list_lock);
cpus_read_unlock();
}
enum {

6
arch/x86/kernel/cpu/resctrl/intel_aet.c
View File

@@ -270,6 +270,12 @@ static bool enable_events(struct event_group *e, struct pmt_feature_group *p)
else
r->mon.num_rmid = e->num_rmid;
if (skipped_events)
pr_info("%s %s:0x%x monitoring detected (skipped %d events)\n", r->name,
e->pfname, e->guid, skipped_events);
else
pr_info("%s %s:0x%x monitoring detected\n", r->name, e->pfname, e->guid);
return true;
}