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 21 #include <linux/mei.h> 22 23 #include "mei_dev.h" 24 #include "client.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 *me_cl; 32 size_t bufsz = 1; 33 char *buf; 34 int i = 0; 35 int pos = 0; 36 int ret; 37 38 #define HDR \ 39 " |id|fix| UUID |con|msg len|sb|refc|\n" 40 41 down_read(&dev->me_clients_rwsem); 42 list_for_each_entry(me_cl, &dev->me_clients, list) 43 bufsz++; 44 45 bufsz *= sizeof(HDR) + 1; 46 buf = kzalloc(bufsz, GFP_KERNEL); 47 if (!buf) { 48 up_read(&dev->me_clients_rwsem); 49 return -ENOMEM; 50 } 51 52 pos += scnprintf(buf + pos, bufsz - pos, HDR); 53 54 /* if the driver is not enabled the list won't be consistent */ 55 if (dev->dev_state != MEI_DEV_ENABLED) 56 goto out; 57 58 list_for_each_entry(me_cl, &dev->me_clients, list) { 59 60 if (mei_me_cl_get(me_cl)) { 61 pos += scnprintf(buf + pos, bufsz - pos, 62 "%2d|%2d|%3d|%pUl|%3d|%7d|%2d|%4d|\n", 63 i++, me_cl->client_id, 64 me_cl->props.fixed_address, 65 &me_cl->props.protocol_name, 66 me_cl->props.max_number_of_connections, 67 me_cl->props.max_msg_length, 68 me_cl->props.single_recv_buf, 69 atomic_read(&me_cl->refcnt.refcount)); 70 71 mei_me_cl_put(me_cl); 72 } 73 } 74 75 out: 76 up_read(&dev->me_clients_rwsem); 77 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos); 78 kfree(buf); 79 return ret; 80 } 81 82 static const struct file_operations mei_dbgfs_fops_meclients = { 83 .open = simple_open, 84 .read = mei_dbgfs_read_meclients, 85 .llseek = generic_file_llseek, 86 }; 87 88 static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf, 89 size_t cnt, loff_t *ppos) 90 { 91 struct mei_device *dev = fp->private_data; 92 struct mei_cl *cl; 93 const size_t bufsz = 1024; 94 char *buf; 95 int i = 0; 96 int pos = 0; 97 int ret; 98 99 if (!dev) 100 return -ENODEV; 101 102 buf = kzalloc(bufsz, GFP_KERNEL); 103 if (!buf) 104 return -ENOMEM; 105 106 pos += scnprintf(buf + pos, bufsz - pos, 107 " |me|host|state|rd|wr|\n"); 108 109 mutex_lock(&dev->device_lock); 110 111 /* if the driver is not enabled the list won't be consistent */ 112 if (dev->dev_state != MEI_DEV_ENABLED) 113 goto out; 114 115 list_for_each_entry(cl, &dev->file_list, link) { 116 117 pos += scnprintf(buf + pos, bufsz - pos, 118 "%2d|%2d|%4d|%5d|%2d|%2d|\n", 119 i, mei_cl_me_id(cl), cl->host_client_id, cl->state, 120 !list_empty(&cl->rd_completed), cl->writing_state); 121 i++; 122 } 123 out: 124 mutex_unlock(&dev->device_lock); 125 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos); 126 kfree(buf); 127 return ret; 128 } 129 130 static const struct file_operations mei_dbgfs_fops_active = { 131 .open = simple_open, 132 .read = mei_dbgfs_read_active, 133 .llseek = generic_file_llseek, 134 }; 135 136 static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf, 137 size_t cnt, loff_t *ppos) 138 { 139 struct mei_device *dev = fp->private_data; 140 const size_t bufsz = 1024; 141 char *buf = kzalloc(bufsz, GFP_KERNEL); 142 int pos = 0; 143 int ret; 144 145 if (!buf) 146 return -ENOMEM; 147 148 pos += scnprintf(buf + pos, bufsz - pos, "dev: %s\n", 149 mei_dev_state_str(dev->dev_state)); 150 pos += scnprintf(buf + pos, bufsz - pos, "hbm: %s\n", 151 mei_hbm_state_str(dev->hbm_state)); 152 153 if (dev->hbm_state == MEI_HBM_STARTED) { 154 pos += scnprintf(buf + pos, bufsz - pos, "hbm features:\n"); 155 pos += scnprintf(buf + pos, bufsz - pos, "\tPG: %01d\n", 156 dev->hbm_f_pg_supported); 157 pos += scnprintf(buf + pos, bufsz - pos, "\tDC: %01d\n", 158 dev->hbm_f_dc_supported); 159 pos += scnprintf(buf + pos, bufsz - pos, "\tDOT: %01d\n", 160 dev->hbm_f_dot_supported); 161 } 162 163 pos += scnprintf(buf + pos, bufsz - pos, "pg: %s, %s\n", 164 mei_pg_is_enabled(dev) ? "ENABLED" : "DISABLED", 165 mei_pg_state_str(mei_pg_state(dev))); 166 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos); 167 kfree(buf); 168 return ret; 169 } 170 static const struct file_operations mei_dbgfs_fops_devstate = { 171 .open = simple_open, 172 .read = mei_dbgfs_read_devstate, 173 .llseek = generic_file_llseek, 174 }; 175 176 /** 177 * mei_dbgfs_deregister - Remove the debugfs files and directories 178 * 179 * @dev: the mei device structure 180 */ 181 void mei_dbgfs_deregister(struct mei_device *dev) 182 { 183 if (!dev->dbgfs_dir) 184 return; 185 debugfs_remove_recursive(dev->dbgfs_dir); 186 dev->dbgfs_dir = NULL; 187 } 188 189 /** 190 * mei_dbgfs_register - Add the debugfs files 191 * 192 * @dev: the mei device structure 193 * @name: the mei device name 194 * 195 * Return: 0 on success, <0 on failure. 196 */ 197 int mei_dbgfs_register(struct mei_device *dev, const char *name) 198 { 199 struct dentry *dir, *f; 200 201 dir = debugfs_create_dir(name, NULL); 202 if (!dir) 203 return -ENOMEM; 204 205 f = debugfs_create_file("meclients", S_IRUSR, dir, 206 dev, &mei_dbgfs_fops_meclients); 207 if (!f) { 208 dev_err(dev->dev, "meclients: registration failed\n"); 209 goto err; 210 } 211 f = debugfs_create_file("active", S_IRUSR, dir, 212 dev, &mei_dbgfs_fops_active); 213 if (!f) { 214 dev_err(dev->dev, "meclients: registration failed\n"); 215 goto err; 216 } 217 f = debugfs_create_file("devstate", S_IRUSR, dir, 218 dev, &mei_dbgfs_fops_devstate); 219 if (!f) { 220 dev_err(dev->dev, "devstate: registration failed\n"); 221 goto err; 222 } 223 f = debugfs_create_bool("allow_fixed_address", S_IRUSR | S_IWUSR, dir, 224 &dev->allow_fixed_address); 225 if (!f) { 226 dev_err(dev->dev, "allow_fixed_address: registration failed\n"); 227 goto err; 228 } 229 dev->dbgfs_dir = dir; 230 return 0; 231 err: 232 mei_dbgfs_deregister(dev); 233 return -ENODEV; 234 } 235 236