linux-kernel - [PATCH v21 10/18] x86/resctrl: Refactor mkdir_mondata

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Message-ID: <20240621223859.43471-11-tony.luck@intel.com>
Date: Fri, 21 Jun 2024 15:38:51 -0700
From: Tony Luck <tony.luck@...el.com>
To: Fenghua Yu <fenghua.yu@...el.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: x86@...nel.org,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v21 10/18] x86/resctrl: Refactor mkdir_mondata_subdir() with a helper function

In Sub-NUMA Cluster (SNC) mode Linux must create the monitor
files in the original "mon_L3_XX" directories and also in each
of the "mon_sub_L3_YY" directories.

Refactor mkdir_mondata_subdir() to move the creation of monitoring files
into a helper function to avoid the need to duplicate code later.

No functional change.

Signed-off-by: Tony Luck <tony.luck@...el.com>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 45 ++++++++++++++++----------
 1 file changed, 28 insertions(+), 17 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 70d41a8fd788..bc5a8a169336 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -3025,14 +3025,37 @@ static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
 	}
 }
 
+static int mon_add_all_files(struct kernfs_node *kn, struct rdt_mon_domain *d,
+			     struct rdt_resource *r, struct rdtgroup *prgrp)
+{
+	union mon_data_bits priv;
+	struct mon_evt *mevt;
+	struct rmid_read rr;
+	int ret;
+
+	if (WARN_ON(list_empty(&r->evt_list)))
+		return -EPERM;
+
+	priv.u.rid = r->rid;
+	priv.u.domid = d->hdr.id;
+	list_for_each_entry(mevt, &r->evt_list, list) {
+		priv.u.evtid = mevt->evtid;
+		ret = mon_addfile(kn, mevt->name, priv.priv);
+		if (ret)
+			return ret;
+
+		if (is_mbm_event(mevt->evtid))
+			mon_event_read(&rr, r, d, prgrp, mevt->evtid, true);
+	}
+
+	return 0;
+}
+
 static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
 				struct rdt_mon_domain *d,
 				struct rdt_resource *r, struct rdtgroup *prgrp)
 {
-	union mon_data_bits priv;
 	struct kernfs_node *kn;
-	struct mon_evt *mevt;
-	struct rmid_read rr;
 	char name[32];
 	int ret;
 
@@ -3046,22 +3069,10 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
 	if (ret)
 		goto out_destroy;
 
-	if (WARN_ON(list_empty(&r->evt_list))) {
-		ret = -EPERM;
+	ret = mon_add_all_files(kn, d, r, prgrp);
+	if (ret)
 		goto out_destroy;
-	}
 
-	priv.u.rid = r->rid;
-	priv.u.domid = d->hdr.id;
-	list_for_each_entry(mevt, &r->evt_list, list) {
-		priv.u.evtid = mevt->evtid;
-		ret = mon_addfile(kn, mevt->name, priv.priv);
-		if (ret)
-			goto out_destroy;
-
-		if (is_mbm_event(mevt->evtid))
-			mon_event_read(&rr, r, d, prgrp, mevt->evtid, true);
-	}
 	kernfs_activate(kn);
 	return 0;
 
-- 
2.45.2