linux-kernel - [RFC PATCH 07/20] x86/intel_rdt: Connect pseudo-locking directory to operations

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Message-Id: <8400c5d421510914f7061f88058e7b8490fa4ba5.1510568528.git.reinette.chatre@intel.com>
Date:   Mon, 13 Nov 2017 08:39:30 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     tglx@...utronix.de, fenghua.yu@...el.com, tony.luck@...el.com
Cc:     vikas.shivappa@...ux.intel.com, dave.hansen@...el.com,
        mingo@...hat.com, hpa@...or.com, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Reinette Chatre <reinette.chatre@...el.com>
Subject: [RFC PATCH 07/20] x86/intel_rdt: Connect pseudo-locking directory to operations

As a dependent of RDT/CAT we hook up the pseudo-locking files
initialization to that of RDT/CAT. The initial operations of mkdir/rmdir
used to create pseudo-locked regions are now hooked up also.

Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>
---
 arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index c711df201e57..afa3795a124e 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -1179,13 +1179,19 @@ static struct dentry *rdt_mount(struct file_system_type *fs_type,
 		goto out_cdp;
 	}
 
+	ret = rdt_pseudo_lock_fs_init(rdtgroup_default.kn);
+	if (ret) {
+		dentry = ERR_PTR(ret);
+		goto out_info;
+	}
+
 	if (rdt_mon_capable) {
 		ret = mongroup_create_dir(rdtgroup_default.kn,
 					  NULL, "mon_groups",
 					  &kn_mongrp);
 		if (ret) {
 			dentry = ERR_PTR(ret);
-			goto out_info;
+			goto out_psl;
 		}
 		kernfs_get(kn_mongrp);
 
@@ -1226,6 +1232,8 @@ static struct dentry *rdt_mount(struct file_system_type *fs_type,
 out_mongrp:
 	if (rdt_mon_capable)
 		kernfs_remove(kn_mongrp);
+out_psl:
+	rdt_pseudo_lock_fs_remove();
 out_info:
 	kernfs_remove(kn_info);
 out_cdp:
@@ -1374,6 +1382,7 @@ static void rmdir_all_sub(void)
 	/* Notify online CPUs to update per cpu storage and PQR_ASSOC MSR */
 	update_closid_rmid(cpu_online_mask, &rdtgroup_default);
 
+	rdt_pseudo_lock_fs_remove();
 	kernfs_remove(kn_info);
 	kernfs_remove(kn_mongrp);
 	kernfs_remove(kn_mondata);
@@ -1796,6 +1805,9 @@ static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
 	if (strchr(name, '\n'))
 		return -EINVAL;
 
+	if (parent_kn == pseudo_lock_kn)
+		return rdt_pseudo_lock_mkdir(name, mode);
+
 	/*
 	 * If the parent directory is the root directory and RDT
 	 * allocation is supported, add a control and monitoring
@@ -1905,6 +1917,9 @@ static int rdtgroup_rmdir(struct kernfs_node *kn)
 	cpumask_var_t tmpmask;
 	int ret = 0;
 
+	if (parent_kn == pseudo_lock_kn)
+		return rdt_pseudo_lock_rmdir(kn);
+
 	if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL))
 		return -ENOMEM;
 
-- 
2.13.5