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// SPDX-License-Identifier: GPL-2.0
/*
* DebugFS interface for the NVMe target.
* Copyright (c) 2022-2024 Shadow
* Copyright (c) 2024 SUSE LLC
*/
#include <linux/debugfs.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include "nvmet.h"
#include "debugfs.h"
static struct dentry *nvmet_debugfs;
#define NVMET_DEBUGFS_ATTR(field) \
static int field##_open(struct inode *inode, struct file *file) \
{ return single_open(file, field##_show, inode->i_private); } \
\
static const struct file_operations field##_fops = { \
.open = field##_open, \
.read = seq_read, \
.release = single_release, \
}
#define NVMET_DEBUGFS_RW_ATTR(field) \
static int field##_open(struct inode *inode, struct file *file) \
{ return single_open(file, field##_show, inode->i_private); } \
\
static const struct file_operations field##_fops = { \
.open = field##_open, \
.read = seq_read, \
.write = field##_write, \
.release = single_release, \
}
static int nvmet_ctrl_hostnqn_show(struct seq_file *m, void *p)
{
struct nvmet_ctrl *ctrl = m->private;
seq_puts(m, ctrl->hostnqn);
return 0;
}
NVMET_DEBUGFS_ATTR(nvmet_ctrl_hostnqn);
static int nvmet_ctrl_kato_show(struct seq_file *m, void *p)
{
struct nvmet_ctrl *ctrl = m->private;
seq_printf(m, "%d\n", ctrl->kato);
return 0;
}
NVMET_DEBUGFS_ATTR(nvmet_ctrl_kato);
static int nvmet_ctrl_port_show(struct seq_file *m, void *p)
{
struct nvmet_ctrl *ctrl = m->private;
seq_printf(m, "%d\n", le16_to_cpu(ctrl->port->disc_addr.portid));
return 0;
}
NVMET_DEBUGFS_ATTR(nvmet_ctrl_port);
static const char *const csts_state_names[] = {
[NVME_CSTS_RDY] = "ready",
[NVME_CSTS_CFS] = "fatal",
[NVME_CSTS_NSSRO] = "reset",
[NVME_CSTS_SHST_OCCUR] = "shutdown",
[NVME_CSTS_SHST_CMPLT] = "completed",
[NVME_CSTS_PP] = "paused",
};
static int nvmet_ctrl_state_show(struct seq_file *m, void *p)
{
struct nvmet_ctrl *ctrl = m->private;
bool sep = false;
int i;
for (i = 0; i < ARRAY_SIZE(csts_state_names); i++) {
int state = BIT(i);
if (!(ctrl->csts & state))
continue;
if (sep)
seq_puts(m, "|");
sep = true;
if (csts_state_names[state])
seq_puts(m, csts_state_names[state]);
else
seq_printf(m, "%d", state);
}
if (sep)
seq_printf(m, "\n");
return 0;
}
static ssize_t nvmet_ctrl_state_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct seq_file *m = file->private_data;
struct nvmet_ctrl *ctrl = m->private;
char reset[16];
if (count >= sizeof(reset))
return -EINVAL;
if (copy_from_user(reset, buf, count))
return -EFAULT;
if (!memcmp(reset, "fatal", 5))
nvmet_ctrl_fatal_error(ctrl);
else
return -EINVAL;
return count;
}
NVMET_DEBUGFS_RW_ATTR(nvmet_ctrl_state);
static int nvmet_ctrl_host_traddr_show(struct seq_file *m, void *p)
{
struct nvmet_ctrl *ctrl = m->private;
ssize_t size;
char buf[NVMF_TRADDR_SIZE + 1];
size = nvmet_ctrl_host_traddr(ctrl, buf, NVMF_TRADDR_SIZE);
if (size < 0) {
buf[0] = '\0';
size = 0;
}
buf[size] = '\0';
seq_printf(m, "%s\n", buf);
return 0;
}
NVMET_DEBUGFS_ATTR(nvmet_ctrl_host_traddr);
#ifdef CONFIG_NVME_TARGET_TCP_TLS
static int nvmet_ctrl_tls_key_show(struct seq_file *m, void *p)
{
struct nvmet_ctrl *ctrl = m->private;
key_serial_t keyid = nvmet_queue_tls_keyid(ctrl->sqs[0]);
seq_printf(m, "%08x\n", keyid);
return 0;
}
NVMET_DEBUGFS_ATTR(nvmet_ctrl_tls_key);
static int nvmet_ctrl_tls_concat_show(struct seq_file *m, void *p)
{
struct nvmet_ctrl *ctrl = m->private;
seq_printf(m, "%d\n", ctrl->concat);
return 0;
}
NVMET_DEBUGFS_ATTR(nvmet_ctrl_tls_concat);
#endif
int nvmet_debugfs_ctrl_setup(struct nvmet_ctrl *ctrl)
{
char name[32];
struct dentry *parent = ctrl->subsys->debugfs_dir;
int ret;
if (!parent)
return -ENODEV;
snprintf(name, sizeof(name), "ctrl%d", ctrl->cntlid);
ctrl->debugfs_dir = debugfs_create_dir(name, parent);
if (IS_ERR(ctrl->debugfs_dir)) {
ret = PTR_ERR(ctrl->debugfs_dir);
ctrl->debugfs_dir = NULL;
return ret;
}
debugfs_create_file("port", S_IRUSR, ctrl->debugfs_dir, ctrl,
&nvmet_ctrl_port_fops);
debugfs_create_file("hostnqn", S_IRUSR, ctrl->debugfs_dir, ctrl,
&nvmet_ctrl_hostnqn_fops);
debugfs_create_file("kato", S_IRUSR, ctrl->debugfs_dir, ctrl,
&nvmet_ctrl_kato_fops);
debugfs_create_file("state", S_IRUSR | S_IWUSR, ctrl->debugfs_dir, ctrl,
&nvmet_ctrl_state_fops);
debugfs_create_file("host_traddr", S_IRUSR, ctrl->debugfs_dir, ctrl,
&nvmet_ctrl_host_traddr_fops);
#ifdef CONFIG_NVME_TARGET_TCP_TLS
debugfs_create_file("tls_concat", S_IRUSR, ctrl->debugfs_dir, ctrl,
&nvmet_ctrl_tls_concat_fops);
debugfs_create_file("tls_key", S_IRUSR, ctrl->debugfs_dir, ctrl,
&nvmet_ctrl_tls_key_fops);
#endif
return 0;
}
void nvmet_debugfs_ctrl_free(struct nvmet_ctrl *ctrl)
{
debugfs_remove_recursive(ctrl->debugfs_dir);
}
int nvmet_debugfs_subsys_setup(struct nvmet_subsys *subsys)
{
int ret = 0;
subsys->debugfs_dir = debugfs_create_dir(subsys->subsysnqn,
nvmet_debugfs);
if (IS_ERR(subsys->debugfs_dir)) {
ret = PTR_ERR(subsys->debugfs_dir);
subsys->debugfs_dir = NULL;
}
return ret;
}
void nvmet_debugfs_subsys_free(struct nvmet_subsys *subsys)
{
debugfs_remove_recursive(subsys->debugfs_dir);
}
int __init nvmet_init_debugfs(void)
{
struct dentry *parent;
parent = debugfs_create_dir("nvmet", NULL);
if (IS_ERR(parent)) {
pr_warn("%s: failed to create debugfs directory\n", "nvmet");
return PTR_ERR(parent);
}
nvmet_debugfs = parent;
return 0;
}
void nvmet_exit_debugfs(void)
{
debugfs_remove_recursive(nvmet_debugfs);
}
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