arm64/mpam: support resctrl_group_schemata_show

hulk inclusion
category: feature
bugzilla: 5510
CVE: NA
Signed-off-by: NXie XiuQi <xiexiuqi@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

arch/arm64/include/asm/mpam.h

@@ -159,6 +159,8 @@ struct rdtgroup {
 	struct mongroup		mon;
 };
 
+extern int max_name_width, max_data_width;
+
 /* rdtgroup.flags */
 #define	RDT_DELETED		1
 

arch/arm64/kernel/mpam.c

@@ -281,6 +281,29 @@ static int mpam_offline_cpu(unsigned int cpu)
 	return 0;
 }
 
+/*
+ * Choose a width for the resource name and resource data based on the
+ * resource that has widest name and cbm.
+ */
+static __init void mpam_init_padding(void)
+{
+	struct resctrl_resource *r;
+	struct raw_resctrl_resource *rr;
+	int cl;
+
+	for_each_resctrl_resource(r) {
+		if (r->alloc_enabled) {
+			rr = (struct raw_resctrl_resource *)r->res;
+			cl = strlen(r->name);
+			if (cl > max_name_width)
+				max_name_width = cl;
+
+			if (rr->data_width > max_data_width)
+				max_data_width = rr->data_width;
+		}
+	}
+}
+
 static __init bool get_rdt_alloc_resources(void)
 {
 	bool ret = true;
@@ -883,6 +906,8 @@ static int __init mpam_late_init(void)
 	if (!get_resctrl_resources())
 		return -ENODEV;
 
+	mpam_init_padding();
+
 	ret = mpam_nodes_init();
 	if (ret) {
 		pr_err("internal error: bad cpu list\n");

arch/arm64/kernel/mpam_ctrlmon.c

@@ -206,9 +206,45 @@ ssize_t resctrl_group_schemata_write(struct kernfs_open_file *of,
 	return ret ?: nbytes;
 }
 
+static void show_doms(struct seq_file *s, struct resctrl_resource *r, int partid)
+{
+	struct raw_resctrl_resource *rr = (struct raw_resctrl_resource *)r->res;
+	struct rdt_domain *dom;
+	bool sep = false;
+
+	seq_printf(s, "%*s:", max_name_width, r->name);
+	list_for_each_entry(dom, &r->domains, list) {
+		if (sep)
+			seq_puts(s, ";");
+		seq_printf(s, rr->format_str, dom->id, max_data_width,
+			   dom->ctrl_val[partid]);
+		sep = true;
+	}
+	seq_puts(s, "\n");
+}
+
 int resctrl_group_schemata_show(struct kernfs_open_file *of,
 			   struct seq_file *s, void *v)
 {
-	seq_printf(s, "resctrl_group_schemata_show\n");
-	return 0;
+	struct rdtgroup *rdtgrp;
+	struct resctrl_resource *r;
+	struct raw_resctrl_resource *rr;
+	int ret = 0;
+	u32 partid;
+
+	rdtgrp = resctrl_group_kn_lock_live(of->kn);
+	if (rdtgrp) {
+		partid = rdtgrp->closid;
+		for_each_resctrl_resource(r) {
+			if (r->alloc_enabled) {
+				rr = (struct raw_resctrl_resource *)r->res;
+				if (partid < rr->num_partid)
+					show_doms(s, r, partid);
+			}
+		}
+	} else {
+		ret = -ENOENT;
+	}
+	resctrl_group_kn_unlock(of->kn);
+	return ret;
 }