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From:   Babu Moger <babu.moger@amd.com>
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Subject: [PATCH v10 09/10] x86/resctrl: Add support for the files for MON groups only
Date:   Fri, 15 Sep 2023 17:42:26 -0500
Message-ID: <20230915224227.1336967-10-babu.moger@amd.com>
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There are 3 types resctrl root files.
1. RFTYPE_BASE : Files common for both MON and CTRL groups
2. RFTYPE_BASE | RFTYPE_CTRL : Files only for CTRL groups
3. RFTYPE_BASE | RFTYPE_MON : Files only for MON groups

Files only for the MON groups are not supported now. Add the
support to create these files.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 953b082cec8a..55d1b90f460e 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2533,6 +2533,7 @@ static void schemata_list_destroy(void)
 static int rdt_get_tree(struct fs_context *fc)
 {
 	struct rdt_fs_context *ctx = rdt_fc2context(fc);
+	unsigned long flags = RFTYPE_CTRL_BASE;
 	struct rdt_domain *dom;
 	struct rdt_resource *r;
 	int ret;
@@ -2563,7 +2564,10 @@ static int rdt_get_tree(struct fs_context *fc)
 
 	closid_init();
 
-	ret = rdtgroup_add_files(rdtgroup_default.kn, RFTYPE_CTRL_BASE);
+	if (rdt_mon_capable)
+		flags |= RFTYPE_MON;
+
+	ret = rdtgroup_add_files(rdtgroup_default.kn, flags);
 	if (ret)
 		goto out_schemata_free;
 
@@ -3253,8 +3257,8 @@ static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
 			     enum rdt_group_type rtype, struct rdtgroup **r)
 {
 	struct rdtgroup *prdtgrp, *rdtgrp;
+	unsigned long files = 0;
 	struct kernfs_node *kn;
-	uint files = 0;
 	int ret;
 
 	prdtgrp = rdtgroup_kn_lock_live(parent_kn);
@@ -3306,10 +3310,13 @@ static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
 		goto out_destroy;
 	}
 
-	if (rtype == RDTCTRL_GROUP)
+	if (rtype == RDTCTRL_GROUP) {
 		files = RFTYPE_BASE | RFTYPE_CTRL;
-	else
+		if (rdt_mon_capable)
+			files |= RFTYPE_MON;
+	} else {
 		files = RFTYPE_BASE | RFTYPE_MON;
+	}
 
 	ret = rdtgroup_add_files(kn, files);
 	if (ret) {
-- 
2.34.1