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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2020 Intel Corporation
#include <linux/debugfs.h>
#include "ufs-debugfs.h"
#include "ufshcd.h"
static struct dentry *ufs_debugfs_root;
struct ufs_debugfs_attr {
const char *name;
mode_t mode;
const struct file_operations *fops;
};
/* @file corresponds to a debugfs attribute in directory hba->debugfs_root. */
static inline struct ufs_hba *hba_from_file(const struct file *file)
{
return d_inode(file->f_path.dentry->d_parent)->i_private;
}
void __init ufs_debugfs_init(void)
{
ufs_debugfs_root = debugfs_create_dir("ufshcd", NULL);
}
void ufs_debugfs_exit(void)
{
debugfs_remove_recursive(ufs_debugfs_root);
}
static int ufs_debugfs_stats_show(struct seq_file *s, void *data)
{
struct ufs_hba *hba = hba_from_file(s->file);
struct ufs_event_hist *e = hba->ufs_stats.event;
#define PRT(fmt, typ) \
seq_printf(s, fmt, e[UFS_EVT_ ## typ].cnt)
PRT("PHY Adapter Layer errors (except LINERESET): %llu\n", PA_ERR);
PRT("Data Link Layer errors: %llu\n", DL_ERR);
PRT("Network Layer errors: %llu\n", NL_ERR);
PRT("Transport Layer errors: %llu\n", TL_ERR);
PRT("Generic DME errors: %llu\n", DME_ERR);
PRT("Auto-hibernate errors: %llu\n", AUTO_HIBERN8_ERR);
PRT("IS Fatal errors (CEFES, SBFES, HCFES, DFES): %llu\n", FATAL_ERR);
PRT("DME Link Startup errors: %llu\n", LINK_STARTUP_FAIL);
PRT("PM Resume errors: %llu\n", RESUME_ERR);
PRT("PM Suspend errors : %llu\n", SUSPEND_ERR);
PRT("Logical Unit Resets: %llu\n", DEV_RESET);
PRT("Host Resets: %llu\n", HOST_RESET);
PRT("SCSI command aborts: %llu\n", ABORT);
#undef PRT
return 0;
}
DEFINE_SHOW_ATTRIBUTE(ufs_debugfs_stats);
static int ee_usr_mask_get(void *data, u64 *val)
{
struct ufs_hba *hba = data;
*val = hba->ee_usr_mask;
return 0;
}
static int ufs_debugfs_get_user_access(struct ufs_hba *hba)
__acquires(&hba->host_sem)
{
down(&hba->host_sem);
if (!ufshcd_is_user_access_allowed(hba)) {
up(&hba->host_sem);
return -EBUSY;
}
ufshcd_rpm_get_sync(hba);
return 0;
}
static void ufs_debugfs_put_user_access(struct ufs_hba *hba)
__releases(&hba->host_sem)
{
ufshcd_rpm_put_sync(hba);
up(&hba->host_sem);
}
static int ee_usr_mask_set(void *data, u64 val)
{
struct ufs_hba *hba = data;
int err;
if (val & ~(u64)MASK_EE_STATUS)
return -EINVAL;
err = ufs_debugfs_get_user_access(hba);
if (err)
return err;
err = ufshcd_update_ee_usr_mask(hba, val, MASK_EE_STATUS);
ufs_debugfs_put_user_access(hba);
return err;
}
DEFINE_DEBUGFS_ATTRIBUTE(ee_usr_mask_fops, ee_usr_mask_get, ee_usr_mask_set, "%#llx\n");
void ufs_debugfs_exception_event(struct ufs_hba *hba, u16 status)
{
bool chgd = false;
u16 ee_ctrl_mask;
int err = 0;
if (!hba->debugfs_ee_rate_limit_ms || !status)
return;
mutex_lock(&hba->ee_ctrl_mutex);
ee_ctrl_mask = hba->ee_drv_mask | (hba->ee_usr_mask & ~status);
chgd = ee_ctrl_mask != hba->ee_ctrl_mask;
if (chgd) {
err = __ufshcd_write_ee_control(hba, ee_ctrl_mask);
if (err)
dev_err(hba->dev, "%s: failed to write ee control %d\n",
__func__, err);
}
mutex_unlock(&hba->ee_ctrl_mutex);
if (chgd && !err) {
unsigned long delay = msecs_to_jiffies(hba->debugfs_ee_rate_limit_ms);
queue_delayed_work(system_freezable_wq, &hba->debugfs_ee_work, delay);
}
}
static void ufs_debugfs_restart_ee(struct work_struct *work)
{
struct ufs_hba *hba = container_of(work, struct ufs_hba, debugfs_ee_work.work);
if (!hba->ee_usr_mask || pm_runtime_suspended(hba->dev) ||
ufs_debugfs_get_user_access(hba))
return;
ufshcd_write_ee_control(hba);
ufs_debugfs_put_user_access(hba);
}
static int ufs_saved_err_show(struct seq_file *s, void *data)
{
struct ufs_debugfs_attr *attr = s->private;
struct ufs_hba *hba = hba_from_file(s->file);
const int *p;
if (strcmp(attr->name, "saved_err") == 0) {
p = &hba->saved_err;
} else if (strcmp(attr->name, "saved_uic_err") == 0) {
p = &hba->saved_uic_err;
} else {
return -ENOENT;
}
seq_printf(s, "%d\n", *p);
return 0;
}
static ssize_t ufs_saved_err_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct ufs_debugfs_attr *attr = file->f_inode->i_private;
struct ufs_hba *hba = hba_from_file(file);
char val_str[16] = { };
int val, ret;
if (count > sizeof(val_str))
return -EINVAL;
if (copy_from_user(val_str, buf, count))
return -EFAULT;
ret = kstrtoint(val_str, 0, &val);
if (ret < 0)
return ret;
spin_lock_irq(hba->host->host_lock);
if (strcmp(attr->name, "saved_err") == 0) {
hba->saved_err = val;
} else if (strcmp(attr->name, "saved_uic_err") == 0) {
hba->saved_uic_err = val;
} else {
ret = -ENOENT;
}
if (ret == 0)
ufshcd_schedule_eh_work(hba);
spin_unlock_irq(hba->host->host_lock);
return ret < 0 ? ret : count;
}
static int ufs_saved_err_open(struct inode *inode, struct file *file)
{
return single_open(file, ufs_saved_err_show, inode->i_private);
}
static const struct file_operations ufs_saved_err_fops = {
.owner = THIS_MODULE,
.open = ufs_saved_err_open,
.read = seq_read,
.write = ufs_saved_err_write,
.llseek = seq_lseek,
.release = single_release,
};
static const struct ufs_debugfs_attr ufs_attrs[] = {
{ "stats", 0400, &ufs_debugfs_stats_fops },
{ "saved_err", 0600, &ufs_saved_err_fops },
{ "saved_uic_err", 0600, &ufs_saved_err_fops },
{ }
};
void ufs_debugfs_hba_init(struct ufs_hba *hba)
{
const struct ufs_debugfs_attr *attr;
struct dentry *root;
/* Set default exception event rate limit period to 20ms */
hba->debugfs_ee_rate_limit_ms = 20;
INIT_DELAYED_WORK(&hba->debugfs_ee_work, ufs_debugfs_restart_ee);
root = debugfs_create_dir(dev_name(hba->dev), ufs_debugfs_root);
if (IS_ERR_OR_NULL(root))
return;
hba->debugfs_root = root;
d_inode(root)->i_private = hba;
for (attr = ufs_attrs; attr->name; attr++)
debugfs_create_file(attr->name, attr->mode, root, (void *)attr,
attr->fops);
debugfs_create_file("exception_event_mask", 0600, hba->debugfs_root,
hba, &ee_usr_mask_fops);
debugfs_create_u32("exception_event_rate_limit_ms", 0600, hba->debugfs_root,
&hba->debugfs_ee_rate_limit_ms);
}
void ufs_debugfs_hba_exit(struct ufs_hba *hba)
{
debugfs_remove_recursive(hba->debugfs_root);
cancel_delayed_work_sync(&hba->debugfs_ee_work);
}
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