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path: root/arch/x86/kernel/cpu/resctrl/rdtgroup.c
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Diffstat (limited to 'arch/x86/kernel/cpu/resctrl/rdtgroup.c')
-rw-r--r--arch/x86/kernel/cpu/resctrl/rdtgroup.c194
1 files changed, 125 insertions, 69 deletions
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 8388adf241b2..db5991e8c7eb 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -24,6 +24,7 @@
#include <linux/cpu.h>
#include <linux/debugfs.h>
#include <linux/fs.h>
+#include <linux/fs_parser.h>
#include <linux/sysfs.h>
#include <linux/kernfs.h>
#include <linux/seq_buf.h>
@@ -32,6 +33,7 @@
#include <linux/sched/task.h>
#include <linux/slab.h>
#include <linux/task_work.h>
+#include <linux/user_namespace.h>
#include <uapi/linux/magic.h>
@@ -1858,46 +1860,6 @@ static void cdp_disable_all(void)
cdpl2_disable();
}
-static int parse_rdtgroupfs_options(char *data)
-{
- char *token, *o = data;
- int ret = 0;
-
- while ((token = strsep(&o, ",")) != NULL) {
- if (!*token) {
- ret = -EINVAL;
- goto out;
- }
-
- if (!strcmp(token, "cdp")) {
- ret = cdpl3_enable();
- if (ret)
- goto out;
- } else if (!strcmp(token, "cdpl2")) {
- ret = cdpl2_enable();
- if (ret)
- goto out;
- } else if (!strcmp(token, "mba_MBps")) {
- if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
- ret = set_mba_sc(true);
- else
- ret = -EINVAL;
- if (ret)
- goto out;
- } else {
- ret = -EINVAL;
- goto out;
- }
- }
-
- return 0;
-
-out:
- pr_err("Invalid mount option \"%s\"\n", token);
-
- return ret;
-}
-
/*
* We don't allow rdtgroup directories to be created anywhere
* except the root directory. Thus when looking for the rdtgroup
@@ -1969,13 +1931,27 @@ static int mkdir_mondata_all(struct kernfs_node *parent_kn,
struct rdtgroup *prgrp,
struct kernfs_node **mon_data_kn);
-static struct dentry *rdt_mount(struct file_system_type *fs_type,
- int flags, const char *unused_dev_name,
- void *data)
+static int rdt_enable_ctx(struct rdt_fs_context *ctx)
{
+ int ret = 0;
+
+ if (ctx->enable_cdpl2)
+ ret = cdpl2_enable();
+
+ if (!ret && ctx->enable_cdpl3)
+ ret = cdpl3_enable();
+
+ if (!ret && ctx->enable_mba_mbps)
+ ret = set_mba_sc(true);
+
+ return ret;
+}
+
+static int rdt_get_tree(struct fs_context *fc)
+{
+ struct rdt_fs_context *ctx = rdt_fc2context(fc);
struct rdt_domain *dom;
struct rdt_resource *r;
- struct dentry *dentry;
int ret;
cpus_read_lock();
@@ -1984,53 +1960,42 @@ static struct dentry *rdt_mount(struct file_system_type *fs_type,
* resctrl file system can only be mounted once.
*/
if (static_branch_unlikely(&rdt_enable_key)) {
- dentry = ERR_PTR(-EBUSY);
+ ret = -EBUSY;
goto out;
}
- ret = parse_rdtgroupfs_options(data);
- if (ret) {
- dentry = ERR_PTR(ret);
+ ret = rdt_enable_ctx(ctx);
+ if (ret < 0)
goto out_cdp;
- }
closid_init();
ret = rdtgroup_create_info_dir(rdtgroup_default.kn);
- if (ret) {
- dentry = ERR_PTR(ret);
- goto out_cdp;
- }
+ if (ret < 0)
+ goto out_mba;
if (rdt_mon_capable) {
ret = mongroup_create_dir(rdtgroup_default.kn,
NULL, "mon_groups",
&kn_mongrp);
- if (ret) {
- dentry = ERR_PTR(ret);
+ if (ret < 0)
goto out_info;
- }
kernfs_get(kn_mongrp);
ret = mkdir_mondata_all(rdtgroup_default.kn,
&rdtgroup_default, &kn_mondata);
- if (ret) {
- dentry = ERR_PTR(ret);
+ if (ret < 0)
goto out_mongrp;
- }
kernfs_get(kn_mondata);
rdtgroup_default.mon.mon_data_kn = kn_mondata;
}
ret = rdt_pseudo_lock_init();
- if (ret) {
- dentry = ERR_PTR(ret);
+ if (ret)
goto out_mondata;
- }
- dentry = kernfs_mount(fs_type, flags, rdt_root,
- RDTGROUP_SUPER_MAGIC, NULL);
- if (IS_ERR(dentry))
+ ret = kernfs_get_tree(fc);
+ if (ret < 0)
goto out_psl;
if (rdt_alloc_capable)
@@ -2059,14 +2024,104 @@ out_mongrp:
kernfs_remove(kn_mongrp);
out_info:
kernfs_remove(kn_info);
+out_mba:
+ if (ctx->enable_mba_mbps)
+ set_mba_sc(false);
out_cdp:
cdp_disable_all();
out:
rdt_last_cmd_clear();
mutex_unlock(&rdtgroup_mutex);
cpus_read_unlock();
+ return ret;
+}
+
+enum rdt_param {
+ Opt_cdp,
+ Opt_cdpl2,
+ Opt_mba_mpbs,
+ nr__rdt_params
+};
+
+static const struct fs_parameter_spec rdt_param_specs[nr__rdt_params] = {
+ [Opt_cdp] = { fs_param_is_flag },
+ [Opt_cdpl2] = { fs_param_is_flag },
+ [Opt_mba_mpbs] = { fs_param_is_flag },
+};
+
+static const char *const rdt_param_keys[nr__rdt_params] = {
+ [Opt_cdp] = "cdp",
+ [Opt_cdpl2] = "cdpl2",
+ [Opt_mba_mpbs] = "mba_mbps",
+};
+
+static const struct fs_parameter_description rdt_fs_parameters = {
+ .name = "rdt",
+ .nr_params = nr__rdt_params,
+ .keys = rdt_param_keys,
+ .specs = rdt_param_specs,
+ .no_source = true,
+};
+
+static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+ struct rdt_fs_context *ctx = rdt_fc2context(fc);
+ struct fs_parse_result result;
+ int opt;
- return dentry;
+ opt = fs_parse(fc, &rdt_fs_parameters, param, &result);
+ if (opt < 0)
+ return opt;
+
+ switch (opt) {
+ case Opt_cdp:
+ ctx->enable_cdpl3 = true;
+ return 0;
+ case Opt_cdpl2:
+ ctx->enable_cdpl2 = true;
+ return 0;
+ case Opt_mba_mpbs:
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) {
+ ctx->enable_mba_mbps = true;
+ return 0;
+ }
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static void rdt_fs_context_free(struct fs_context *fc)
+{
+ struct rdt_fs_context *ctx = rdt_fc2context(fc);
+
+ kernfs_free_fs_context(fc);
+ kfree(ctx);
+}
+
+static const struct fs_context_operations rdt_fs_context_ops = {
+ .free = rdt_fs_context_free,
+ .parse_param = rdt_parse_param,
+ .get_tree = rdt_get_tree,
+};
+
+static int rdt_init_fs_context(struct fs_context *fc)
+{
+ struct rdt_fs_context *ctx;
+
+ ctx = kzalloc(sizeof(struct rdt_fs_context), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->kfc.root = rdt_root;
+ ctx->kfc.magic = RDTGROUP_SUPER_MAGIC;
+ fc->fs_private = &ctx->kfc;
+ fc->ops = &rdt_fs_context_ops;
+ if (fc->user_ns)
+ put_user_ns(fc->user_ns);
+ fc->user_ns = get_user_ns(&init_user_ns);
+ fc->global = true;
+ return 0;
}
static int reset_all_ctrls(struct rdt_resource *r)
@@ -2239,9 +2294,10 @@ static void rdt_kill_sb(struct super_block *sb)
}
static struct file_system_type rdt_fs_type = {
- .name = "resctrl",
- .mount = rdt_mount,
- .kill_sb = rdt_kill_sb,
+ .name = "resctrl",
+ .init_fs_context = rdt_init_fs_context,
+ .parameters = &rdt_fs_parameters,
+ .kill_sb = rdt_kill_sb,
};
static int mon_addfile(struct kernfs_node *parent_kn, const char *name,