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Subject[tip:x86/cache] x86/intel_rdt: Prepare for RDT monitoring mkdir support
Commit-ID:  65b4f403057e32da73c36e33d403890173c4c324
Gitweb: http://git.kernel.org/tip/65b4f403057e32da73c36e33d403890173c4c324
Author: Vikas Shivappa <vikas.shivappa@linux.intel.com>
AuthorDate: Tue, 25 Jul 2017 14:14:31 -0700
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Tue, 1 Aug 2017 22:41:23 +0200

x86/intel_rdt: Prepare for RDT monitoring mkdir support

Separate the ctrl mkdir code from the rest in order to prepare for
adding support for RDT monitoring mkdir support as well.

Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: ravi.v.shankar@intel.com
Cc: tony.luck@intel.com
Cc: fenghua.yu@intel.com
Cc: peterz@infradead.org
Cc: eranian@google.com
Cc: vikas.shivappa@intel.com
Cc: ak@linux.intel.com
Cc: davidcc@google.com
Cc: reinette.chatre@intel.com
Link: http://lkml.kernel.org/r/1501017287-28083-13-git-send-email-vikas.shivappa@linux.intel.com

---
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 111 ++++++++++++++++++++++---------
1 file changed, 79 insertions(+), 32 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index 14489a5..b3c901a 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -1082,46 +1082,35 @@ static struct file_system_type rdt_fs_type = {
.kill_sb = rdt_kill_sb,
};

-static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
- umode_t mode)
+static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
+ struct kernfs_node *prgrp_kn,
+ const char *name, umode_t mode,
+ struct rdtgroup **r)
{
- struct rdtgroup *parent, *rdtgrp;
+ struct rdtgroup *prdtgrp, *rdtgrp;
struct kernfs_node *kn;
- int ret, closid;
-
- /* Only allow mkdir in the root directory */
- if (parent_kn != rdtgroup_default.kn)
- return -EPERM;
-
- /* Do not accept '\n' to avoid unparsable situation. */
- if (strchr(name, '\n'))
- return -EINVAL;
+ uint files = 0;
+ int ret;

- parent = rdtgroup_kn_lock_live(parent_kn);
- if (!parent) {
+ prdtgrp = rdtgroup_kn_lock_live(prgrp_kn);
+ if (!prdtgrp) {
ret = -ENODEV;
goto out_unlock;
}

- ret = closid_alloc();
- if (ret < 0)
- goto out_unlock;
- closid = ret;
-
/* allocate the rdtgroup. */
rdtgrp = kzalloc(sizeof(*rdtgrp), GFP_KERNEL);
if (!rdtgrp) {
ret = -ENOSPC;
- goto out_closid_free;
+ goto out_unlock;
}
- rdtgrp->closid = closid;
- list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups);
+ *r = rdtgrp;

/* kernfs creates the directory for rdtgrp */
- kn = kernfs_create_dir(parent->kn, name, mode, rdtgrp);
+ kn = kernfs_create_dir(parent_kn, name, mode, rdtgrp);
if (IS_ERR(kn)) {
ret = PTR_ERR(kn);
- goto out_cancel_ref;
+ goto out_free_rgrp;
}
rdtgrp->kn = kn;

@@ -1137,27 +1126,85 @@ static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
if (ret)
goto out_destroy;

- ret = rdtgroup_add_files(kn, RF_CTRL_BASE);
+ files = RFTYPE_BASE | RFTYPE_CTRL;
+ ret = rdtgroup_add_files(kn, files);
if (ret)
goto out_destroy;

kernfs_activate(kn);

- ret = 0;
- goto out_unlock;
+ /*
+ * The caller unlocks the prgrp_kn upon success.
+ */
+ return 0;

out_destroy:
kernfs_remove(rdtgrp->kn);
-out_cancel_ref:
- list_del(&rdtgrp->rdtgroup_list);
+out_free_rgrp:
kfree(rdtgrp);
-out_closid_free:
- closid_free(closid);
out_unlock:
- rdtgroup_kn_unlock(parent_kn);
+ rdtgroup_kn_unlock(prgrp_kn);
+ return ret;
+}
+
+static void mkdir_rdt_prepare_clean(struct rdtgroup *rgrp)
+{
+ kernfs_remove(rgrp->kn);
+ kfree(rgrp);
+}
+
+/*
+ * These are rdtgroups created under the root directory. Can be used
+ * to allocate resources.
+ */
+static int rdtgroup_mkdir_ctrl(struct kernfs_node *parent_kn,
+ struct kernfs_node *prgrp_kn,
+ const char *name, umode_t mode)
+{
+ struct rdtgroup *rdtgrp;
+ struct kernfs_node *kn;
+ u32 closid;
+ int ret;
+
+ ret = mkdir_rdt_prepare(parent_kn, prgrp_kn, name, mode, &rdtgrp);
+ if (ret)
+ return ret;
+
+ kn = rdtgrp->kn;
+ ret = closid_alloc();
+ if (ret < 0)
+ goto out_common_fail;
+ closid = ret;
+
+ rdtgrp->closid = closid;
+ list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups);
+
+ goto out_unlock;
+
+out_common_fail:
+ mkdir_rdt_prepare_clean(rdtgrp);
+out_unlock:
+ rdtgroup_kn_unlock(prgrp_kn);
return ret;
}

+static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
+ umode_t mode)
+{
+ /* Do not accept '\n' to avoid unparsable situation. */
+ if (strchr(name, '\n'))
+ return -EINVAL;
+
+ /*
+ * If the parent directory is the root directory and RDT
+ * allocation is supported, add a control rdtgroup.
+ */
+ if (rdt_alloc_capable && parent_kn == rdtgroup_default.kn)
+ return rdtgroup_mkdir_ctrl(parent_kn, parent_kn, name, mode);
+
+ return -EPERM;
+}
+
static int rdtgroup_rmdir(struct kernfs_node *kn)
{
int ret, cpu, closid = rdtgroup_default.closid;
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