cd46947561
Allow users to enable specific exception events via debugfs. The bits enabled by the driver ee_drv_ctrl are separated from the bits enabled by the user ee_usr_ctrl. The control mask ee_mask_ctrl is the logical-or of those two. A mutex is needed to ensure that the masks match what was written to the device. Link: https://lore.kernel.org/r/20210209062437.6954-4-adrian.hunter@intel.com Acked-by: Bean Huo <beanhuo@micron.com> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
103 lines
2.6 KiB
C
103 lines
2.6 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 __exit 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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pm_runtime_get_sync(hba->dev);
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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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pm_runtime_put_sync(hba->dev);
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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_hba_init(struct ufs_hba *hba)
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{
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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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}
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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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}
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