diff options
Diffstat (limited to 'drivers/ufs/core/ufs-debugfs.c')
| -rw-r--r-- | drivers/ufs/core/ufs-debugfs.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/drivers/ufs/core/ufs-debugfs.c b/drivers/ufs/core/ufs-debugfs.c new file mode 100644 index 000000000000..e3baed6c70bd --- /dev/null +++ b/drivers/ufs/core/ufs-debugfs.c @@ -0,0 +1,239 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2020 Intel Corporation + +#include <linux/debugfs.h> + +#include "ufs-debugfs.h" +#include <ufs/ufshcd.h> +#include "ufshcd-priv.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); +} |