147 lines
3.9 KiB
C
147 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2020 Intel Corporation
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#include <linux/debugfs.h>
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#include "ufs-debugfs.h"
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#include "ufshcd.h"
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static struct dentry *ufs_debugfs_root;
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void __init ufs_debugfs_init(void)
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{
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ufs_debugfs_root = debugfs_create_dir("ufshcd", NULL);
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}
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void ufs_debugfs_exit(void)
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{
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debugfs_remove_recursive(ufs_debugfs_root);
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}
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static int ufs_debugfs_stats_show(struct seq_file *s, void *data)
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{
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struct ufs_hba *hba = s->private;
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struct ufs_event_hist *e = hba->ufs_stats.event;
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#define PRT(fmt, typ) \
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seq_printf(s, fmt, e[UFS_EVT_ ## typ].cnt)
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PRT("PHY Adapter Layer errors (except LINERESET): %llu\n", PA_ERR);
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PRT("Data Link Layer errors: %llu\n", DL_ERR);
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PRT("Network Layer errors: %llu\n", NL_ERR);
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PRT("Transport Layer errors: %llu\n", TL_ERR);
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PRT("Generic DME errors: %llu\n", DME_ERR);
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PRT("Auto-hibernate errors: %llu\n", AUTO_HIBERN8_ERR);
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PRT("IS Fatal errors (CEFES, SBFES, HCFES, DFES): %llu\n", FATAL_ERR);
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PRT("DME Link Startup errors: %llu\n", LINK_STARTUP_FAIL);
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PRT("PM Resume errors: %llu\n", RESUME_ERR);
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PRT("PM Suspend errors : %llu\n", SUSPEND_ERR);
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PRT("Logical Unit Resets: %llu\n", DEV_RESET);
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PRT("Host Resets: %llu\n", HOST_RESET);
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PRT("SCSI command aborts: %llu\n", ABORT);
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#undef PRT
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(ufs_debugfs_stats);
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static int ee_usr_mask_get(void *data, u64 *val)
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{
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struct ufs_hba *hba = data;
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*val = hba->ee_usr_mask;
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return 0;
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}
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static int ufs_debugfs_get_user_access(struct ufs_hba *hba)
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__acquires(&hba->host_sem)
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{
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down(&hba->host_sem);
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if (!ufshcd_is_user_access_allowed(hba)) {
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up(&hba->host_sem);
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return -EBUSY;
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}
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ufshcd_rpm_get_sync(hba);
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return 0;
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}
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static void ufs_debugfs_put_user_access(struct ufs_hba *hba)
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__releases(&hba->host_sem)
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{
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ufshcd_rpm_put_sync(hba);
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up(&hba->host_sem);
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}
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static int ee_usr_mask_set(void *data, u64 val)
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{
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struct ufs_hba *hba = data;
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int err;
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if (val & ~(u64)MASK_EE_STATUS)
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return -EINVAL;
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err = ufs_debugfs_get_user_access(hba);
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if (err)
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return err;
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err = ufshcd_update_ee_usr_mask(hba, val, MASK_EE_STATUS);
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ufs_debugfs_put_user_access(hba);
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return err;
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}
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DEFINE_DEBUGFS_ATTRIBUTE(ee_usr_mask_fops, ee_usr_mask_get, ee_usr_mask_set, "%#llx\n");
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void ufs_debugfs_exception_event(struct ufs_hba *hba, u16 status)
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{
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bool chgd = false;
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u16 ee_ctrl_mask;
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int err = 0;
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if (!hba->debugfs_ee_rate_limit_ms || !status)
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return;
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mutex_lock(&hba->ee_ctrl_mutex);
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ee_ctrl_mask = hba->ee_drv_mask | (hba->ee_usr_mask & ~status);
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chgd = ee_ctrl_mask != hba->ee_ctrl_mask;
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if (chgd) {
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err = __ufshcd_write_ee_control(hba, ee_ctrl_mask);
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if (err)
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dev_err(hba->dev, "%s: failed to write ee control %d\n",
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__func__, err);
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}
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mutex_unlock(&hba->ee_ctrl_mutex);
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if (chgd && !err) {
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unsigned long delay = msecs_to_jiffies(hba->debugfs_ee_rate_limit_ms);
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queue_delayed_work(system_freezable_wq, &hba->debugfs_ee_work, delay);
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}
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}
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static void ufs_debugfs_restart_ee(struct work_struct *work)
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{
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struct ufs_hba *hba = container_of(work, struct ufs_hba, debugfs_ee_work.work);
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if (!hba->ee_usr_mask || pm_runtime_suspended(hba->dev) ||
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ufs_debugfs_get_user_access(hba))
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return;
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ufshcd_write_ee_control(hba);
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ufs_debugfs_put_user_access(hba);
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}
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void ufs_debugfs_hba_init(struct ufs_hba *hba)
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{
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/* Set default exception event rate limit period to 20ms */
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hba->debugfs_ee_rate_limit_ms = 20;
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INIT_DELAYED_WORK(&hba->debugfs_ee_work, ufs_debugfs_restart_ee);
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hba->debugfs_root = debugfs_create_dir(dev_name(hba->dev), ufs_debugfs_root);
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debugfs_create_file("stats", 0400, hba->debugfs_root, hba, &ufs_debugfs_stats_fops);
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debugfs_create_file("exception_event_mask", 0600, hba->debugfs_root,
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hba, &ee_usr_mask_fops);
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debugfs_create_u32("exception_event_rate_limit_ms", 0600, hba->debugfs_root,
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&hba->debugfs_ee_rate_limit_ms);
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}
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void ufs_debugfs_hba_exit(struct ufs_hba *hba)
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{
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debugfs_remove_recursive(hba->debugfs_root);
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cancel_delayed_work_sync(&hba->debugfs_ee_work);
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}
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