linux-kernel - [PATCH v2 08/16] x86/resctrl: Add Intel PMT domain specific code

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Message-ID: <20250321231609.57418-9-tony.luck@intel.com>
Date: Fri, 21 Mar 2025 16:15:58 -0700
From: Tony Luck <tony.luck@...el.com>
To: Fenghua Yu <fenghuay@...dia.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
	Peter Newman <peternewman@...gle.com>,
	James Morse <james.morse@....com>,
	Babu Moger <babu.moger@....com>,
	Drew Fustini <dfustini@...libre.com>,
	Dave Martin <Dave.Martin@....com>
Cc: linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v2 08/16] x86/resctrl: Add Intel PMT domain specific code

Domain specific initialization and tear down. Very simple as
there are no domain specific elements that need to be allocated
or initiailazed. Just the domain itself.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/kernel/cpu/resctrl/core.c | 32 ++++++++++++++++++++++++++++++
 fs/resctrl/rdtgroup.c              | 11 ++++++++--
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 1ab0f5eec244..2adf40d8de32 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -541,6 +541,29 @@ static void setup_l3_mon_domain(int cpu, int id, struct rdt_resource *r, struct
 	}
 }
 
+static void setup_intel_aet_mon_domain(int cpu, int id, struct rdt_resource *r,
+				       struct list_head *add_pos)
+{
+	struct rdt_core_mon_domain *d;
+	int err;
+
+	d = kzalloc_node(sizeof(*d), GFP_KERNEL, cpu_to_node(cpu));
+	if (!d)
+		return;
+
+	d->hdr.id = id;
+	d->hdr.type = RESCTRL_MON_DOMAIN;
+	cpumask_set_cpu(cpu, &d->hdr.cpu_mask);
+	list_add_tail_rcu(&d->hdr.list, add_pos);
+
+	err = resctrl_online_mon_domain(r, &d->hdr);
+	if (err) {
+		list_del_rcu(&d->hdr.list);
+		synchronize_rcu();
+		kfree(d);
+	}
+}
+
 static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
 {
 	int id = get_domain_id_from_scope(cpu, r->mon_scope);
@@ -565,6 +588,9 @@ static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
 	case RDT_RESOURCE_L3:
 		setup_l3_mon_domain(cpu, id, r, add_pos);
 		break;
+	case RDT_RESOURCE_INTEL_AET:
+		setup_intel_aet_mon_domain(cpu, id, r, add_pos);
+		break;
 	default:
 		WARN_ON_ONCE(1);
 	}
@@ -661,6 +687,12 @@ static void domain_remove_cpu_mon(int cpu, struct rdt_resource *r)
 		synchronize_rcu();
 		mon_domain_free(hw_dom);
 		break;
+	case RDT_RESOURCE_INTEL_AET:
+		resctrl_offline_mon_domain(r, d);
+		list_del_rcu(&hdr->list);
+		synchronize_rcu();
+		kfree(container_of(hdr, struct rdt_core_mon_domain, hdr));
+		break;
 	}
 }
 
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 4833dfa08ce3..d3919642aa9b 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -4077,6 +4077,9 @@ void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d
 	if (resctrl_mounted && resctrl_arch_mon_capable())
 		rmdir_mondata_subdir_allrdtgrp(r, &d->hdr);
 
+	if (r->rid == RDT_RESOURCE_INTEL_AET)
+		goto done;
+
 	if (resctrl_is_mbm_enabled())
 		cancel_delayed_work(&d->mbm_over);
 	if (resctrl_arch_is_llc_occupancy_enabled() && has_busy_rmid(d)) {
@@ -4093,7 +4096,7 @@ void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d
 	}
 
 	domain_destroy_mon_state(d);
-
+done:
 	mutex_unlock(&rdtgroup_mutex);
 }
 
@@ -4160,11 +4163,14 @@ int resctrl_online_ctrl_domain(struct rdt_resource *r, struct rdt_ctrl_domain *d
 int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_domain_hdr *hdr)
 {
 	struct rdt_mon_domain *d;
-	int err;
+	int err = 0;
 
 	d = container_of(hdr, struct rdt_mon_domain, hdr);
 	mutex_lock(&rdtgroup_mutex);
 
+	if (r->rid == RDT_RESOURCE_INTEL_AET)
+		goto do_mkdir;
+
 	err = domain_setup_mon_state(r, d);
 	if (err)
 		goto out_unlock;
@@ -4178,6 +4184,7 @@ int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_domain_hdr *hdr
 	if (resctrl_arch_is_llc_occupancy_enabled())
 		INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo);
 
+do_mkdir:
 	/*
 	 * If the filesystem is not mounted then only the default resource group
 	 * exists. Creation of its directories is deferred until mount time
-- 
2.48.1