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

[Tony Luck]

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@xxxxxxxxx>
---
 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