drivers/misc/mei/debugfs.c

   1 /*
   2  *
   3  * Intel Management Engine Interface (Intel MEI) Linux driver
   4  * Copyright (c) 2012-2013, Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  */
  16 #include <linux/slab.h>
  17 #include <linux/kernel.h>
  18 #include <linux/device.h>
  19 #include <linux/debugfs.h>
  20 #include <linux/pci.h>
  21
  22 #include <linux/mei.h>
  23
  24 #include "mei_dev.h"
  25 #include "hw.h"
  26
  27 static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
  28                                         size_t cnt, loff_t *ppos)
  29 {
  30         struct mei_device *dev = fp->private_data;
  31         struct mei_me_client *cl;
  32         const size_t bufsz = 1024;
  33         char *buf = kzalloc(bufsz, GFP_KERNEL);
  34         int i;
  35         int pos = 0;
  36         int ret;
  37
  38         if  (!buf)
  39                 return -ENOMEM;
  40
  41         pos += scnprintf(buf + pos, bufsz - pos,
  42                         "  |id|addr|         UUID                       |con|msg len|\n");
  43
  44         mutex_lock(&dev->device_lock);
  45
  46         /*  if the driver is not enabled the list won't be consistent */
  47         if (dev->dev_state != MEI_DEV_ENABLED)
  48                 goto out;
  49
  50         for (i = 0; i < dev->me_clients_num; i++) {
  51                 cl = &dev->me_clients[i];
  52
  53                 /* skip me clients that cannot be connected */
  54                 if (cl->props.max_number_of_connections == 0)
  55                         continue;
  56
  57                 pos += scnprintf(buf + pos, bufsz - pos,
  58                         "%2d|%2d|%4d|%pUl|%3d|%7d|\n",
  59                         i, cl->client_id,
  60                         cl->props.fixed_address,
  61                         &cl->props.protocol_name,
  62                         cl->props.max_number_of_connections,
  63                         cl->props.max_msg_length);
  64         }
  65 out:
  66         mutex_unlock(&dev->device_lock);
  67         ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
  68         kfree(buf);
  69         return ret;
  70 }
  71
  72 static const struct file_operations mei_dbgfs_fops_meclients = {
  73         .open = simple_open,
  74         .read = mei_dbgfs_read_meclients,
  75         .llseek = generic_file_llseek,
  76 };
  77
  78 static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf,
  79                                         size_t cnt, loff_t *ppos)
  80 {
  81         struct mei_device *dev = fp->private_data;
  82         const size_t bufsz = 1024;
  83         char *buf = kzalloc(bufsz, GFP_KERNEL);
  84         int pos = 0;
  85         int ret;
  86
  87         if  (!buf)
  88                 return -ENOMEM;
  89
  90         pos += scnprintf(buf + pos, bufsz - pos, "%s\n",
  91                         mei_dev_state_str(dev->dev_state));
  92         ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
  93         kfree(buf);
  94         return ret;
  95 }
  96 static const struct file_operations mei_dbgfs_fops_devstate = {
  97         .open = simple_open,
  98         .read = mei_dbgfs_read_devstate,
  99         .llseek = generic_file_llseek,
 100 };
 101
 102 /**
 103  * mei_dbgfs_deregister - Remove the debugfs files and directories
 104  * @mei - pointer to mei device private data
 105  */
 106 void mei_dbgfs_deregister(struct mei_device *dev)
 107 {
 108         if (!dev->dbgfs_dir)
 109                 return;
 110         debugfs_remove_recursive(dev->dbgfs_dir);
 111         dev->dbgfs_dir = NULL;
 112 }
 113
 114 /**
 115  * Add the debugfs files
 116  *
 117  */
 118 int mei_dbgfs_register(struct mei_device *dev, const char *name)
 119 {
 120         struct dentry *dir, *f;
 121         dir = debugfs_create_dir(name, NULL);
 122         if (!dir)
 123                 return -ENOMEM;
 124
 125         f = debugfs_create_file("meclients", S_IRUSR, dir,
 126                                 dev, &mei_dbgfs_fops_meclients);
 127         if (!f) {
 128                 dev_err(&dev->pdev->dev, "meclients: registration failed\n");
 129                 goto err;
 130         }
 131         f = debugfs_create_file("devstate", S_IRUSR, dir,
 132                                 dev, &mei_dbgfs_fops_devstate);
 133         if (!f) {
 134                 dev_err(&dev->pdev->dev, "devstate: registration failed\n");
 135                 goto err;
 136         }
 137         dev->dbgfs_dir = dir;
 138         return 0;
 139 err:
 140         mei_dbgfs_deregister(dev);
 141         return -ENODEV;
 142 }
 143