drivers/scsi/mpt3sas/mpt3sas_debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Debugfs interface Support for MPT (Message Passing Technology) based
   4  * controllers.
   5  *
   6  * Copyright (C) 2020  Broadcom Inc.
   7  *
   8  * Authors: Broadcom Inc.
   9  * Sreekanth Reddy  <sreekanth.reddy@broadcom.com>
  10  * Suganath Prabu <suganath-prabu.subramani@broadcom.com>
  11  *
  12  * Send feedback to : MPT-FusionLinux.pdl@broadcom.com)
  13  *
  14  **/
  15
  16 #include <linux/kernel.h>
  17 #include <linux/types.h>
  18 #include <linux/pci.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/compat.h>
  21 #include <linux/uio.h>
  22
  23 #include <scsi/scsi.h>
  24 #include <scsi/scsi_device.h>
  25 #include <scsi/scsi_host.h>
  26 #include "mpt3sas_base.h"
  27 #include <linux/debugfs.h>
  28
  29 static struct dentry *mpt3sas_debugfs_root;
  30
  31 /*
  32  * _debugfs_iocdump_read - copy ioc dump from debugfs buffer
  33  * @filep:      File Pointer
  34  * @ubuf:       Buffer to fill data
  35  * @cnt:        Length of the buffer
  36  * @ppos:       Offset in the file
  37  */
  38
  39 static ssize_t
  40 _debugfs_iocdump_read(struct file *filp, char __user *ubuf, size_t cnt,
  41         loff_t *ppos)
  42
  43 {
  44         struct mpt3sas_debugfs_buffer *debug = filp->private_data;
  45
  46         if (!debug || !debug->buf)
  47                 return 0;
  48
  49         return simple_read_from_buffer(ubuf, cnt, ppos, debug->buf, debug->len);
  50 }
  51
  52 /*
  53  * _debugfs_iocdump_open :      open the ioc_dump debugfs attribute file
  54  */
  55 static int
  56 _debugfs_iocdump_open(struct inode *inode, struct file *file)
  57 {
  58         struct MPT3SAS_ADAPTER *ioc = inode->i_private;
  59         struct mpt3sas_debugfs_buffer *debug;
  60
  61         debug = kzalloc(sizeof(struct mpt3sas_debugfs_buffer), GFP_KERNEL);
  62         if (!debug)
  63                 return -ENOMEM;
  64
  65         debug->buf = (void *)ioc;
  66         debug->len = sizeof(struct MPT3SAS_ADAPTER);
  67         file->private_data = debug;
  68         return 0;
  69 }
  70
  71 /*
  72  * _debugfs_iocdump_release :   release the ioc_dump debugfs attribute
  73  * @inode: inode structure to the corresponds device
  74  * @file: File pointer
  75  */
  76 static int
  77 _debugfs_iocdump_release(struct inode *inode, struct file *file)
  78 {
  79         struct mpt3sas_debugfs_buffer *debug = file->private_data;
  80
  81         if (!debug)
  82                 return 0;
  83
  84         file->private_data = NULL;
  85         kfree(debug);
  86         return 0;
  87 }
  88
  89 static const struct file_operations mpt3sas_debugfs_iocdump_fops = {
  90         .owner          = THIS_MODULE,
  91         .open           = _debugfs_iocdump_open,
  92         .read           = _debugfs_iocdump_read,
  93         .release        = _debugfs_iocdump_release,
  94 };
  95
  96 /*
  97  * mpt3sas_init_debugfs :       Create debugfs root for mpt3sas driver
  98  */
  99 void mpt3sas_init_debugfs(void)
 100 {
 101         mpt3sas_debugfs_root = debugfs_create_dir("mpt3sas", NULL);
 102         if (!mpt3sas_debugfs_root)
 103                 pr_info("mpt3sas: Cannot create debugfs root\n");
 104 }
 105
 106 /*
 107  * mpt3sas_exit_debugfs :       Remove debugfs root for mpt3sas driver
 108  */
 109 void mpt3sas_exit_debugfs(void)
 110 {
 111         debugfs_remove_recursive(mpt3sas_debugfs_root);
 112 }
 113
 114 /*
 115  * mpt3sas_setup_debugfs :      Setup debugfs per HBA adapter
 116  * ioc:                         MPT3SAS_ADAPTER object
 117  */
 118 void
 119 mpt3sas_setup_debugfs(struct MPT3SAS_ADAPTER *ioc)
 120 {
 121         char name[64];
 122
 123         snprintf(name, sizeof(name), "scsi_host%d", ioc->shost->host_no);
 124         if (!ioc->debugfs_root) {
 125                 ioc->debugfs_root =
 126                     debugfs_create_dir(name, mpt3sas_debugfs_root);
 127                 if (!ioc->debugfs_root) {
 128                         dev_err(&ioc->pdev->dev,
 129                             "Cannot create per adapter debugfs directory\n");
 130                         return;
 131                 }
 132         }
 133
 134         snprintf(name, sizeof(name), "ioc_dump");
 135         ioc->ioc_dump = debugfs_create_file(name, 0444,
 136             ioc->debugfs_root, ioc, &mpt3sas_debugfs_iocdump_fops);
 137         if (!ioc->ioc_dump) {
 138                 dev_err(&ioc->pdev->dev,
 139                     "Cannot create ioc_dump debugfs file\n");
 140                 debugfs_remove(ioc->debugfs_root);
 141                 return;
 142         }
 143
 144         snprintf(name, sizeof(name), "host_recovery");
 145         debugfs_create_u8(name, 0444, ioc->debugfs_root, &ioc->shost_recovery);
 146
 147 }
 148
 149 /*
 150  * mpt3sas_destroy_debugfs :    Destroy debugfs per HBA adapter
 151  * @ioc:        MPT3SAS_ADAPTER object
 152  */
 153 void mpt3sas_destroy_debugfs(struct MPT3SAS_ADAPTER *ioc)
 154 {
 155         debugfs_remove_recursive(ioc->debugfs_root);
 156 }
 157