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x86/resctrl: Refactor domain_remove_cpu_mon() ready for new domain types

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New telemetry events will be associated with a new package scoped resource
with a new domain structure.

Refactor domain_remove_cpu_mon() so all the L3 domain processing is separate
from the general domain action of clearing the CPU bit in the mask.

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 2025-12-17 09:20:50 -08:00 committed by Borislav Petkov (AMD)
parent 0d6447623d
commit 6396fc5351
1 changed files with 17 additions and 10 deletions
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27
arch/x86/kernel/cpu/resctrl/core.c
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@ -631,9 +631,7 @@ static void domain_remove_cpu_ctrl(int cpu, struct rdt_resource *r)
static void domain_remove_cpu_mon(int cpu, struct rdt_resource *r)
{
int id = get_domain_id_from_scope(cpu, r->mon_scope);
struct rdt_hw_mon_domain *hw_dom;
struct rdt_domain_hdr *hdr;
struct rdt_mon_domain *d;
lockdep_assert_held(&domain_list_lock);
@ -650,20 +648,29 @@ static void domain_remove_cpu_mon(int cpu, struct rdt_resource *r)
return;
}
if (!domain_header_is_valid(hdr, RESCTRL_MON_DOMAIN, r->rid))
cpumask_clear_cpu(cpu, &hdr->cpu_mask);
if (!cpumask_empty(&hdr->cpu_mask))
return;
d = container_of(hdr, struct rdt_mon_domain, hdr);
hw_dom = resctrl_to_arch_mon_dom(d);
switch (r->rid) {
case RDT_RESOURCE_L3: {
struct rdt_hw_mon_domain *hw_dom;
struct rdt_mon_domain *d;
cpumask_clear_cpu(cpu, &d->hdr.cpu_mask);
if (cpumask_empty(&d->hdr.cpu_mask)) {
if (!domain_header_is_valid(hdr, RESCTRL_MON_DOMAIN, RDT_RESOURCE_L3))
return;
d = container_of(hdr, struct rdt_mon_domain, hdr);
hw_dom = resctrl_to_arch_mon_dom(d);
resctrl_offline_mon_domain(r, d);
list_del_rcu(&d->hdr.list);
list_del_rcu(&hdr->list);
synchronize_rcu();
mon_domain_free(hw_dom);
return;
break;
}
default:
pr_warn_once("Unknown resource rid=%d\n", r->rid);
break;
}
}