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 #undef HDR 54 55 /* if the driver is not enabled the list won't be consistent */ 56 if (dev->dev_state != MEI_DEV_ENABLED) 57 goto out; 58 59 list_for_each_entry(me_cl, &dev->me_clients, list) { 60 61 if (mei_me_cl_get(me_cl)) { 62 pos += scnprintf(buf + pos, bufsz - pos, 63 "%2d|%2d|%3d|%pUl|%3d|%7d|%2d|%4d|\n", 64 i++, me_cl->client_id, 65 me_cl->props.fixed_address, 66 &me_cl->props.protocol_name, 67 me_cl->props.max_number_of_connections, 68 me_cl->props.max_msg_length, 69 me_cl->props.single_recv_buf, 70 atomic_read(&me_cl->refcnt.refcount)); 71 72 mei_me_cl_put(me_cl); 73 } 74 } 75 76 out: 77 up_read(&dev->me_clients_rwsem); 78 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos); 79 kfree(buf); 80 return ret; 81 } 82 83 static const struct file_operations mei_dbgfs_fops_meclients = { 84 .open = simple_open, 85 .read = mei_dbgfs_read_meclients, 86 .llseek = generic_file_llseek, 87 }; 88 89 static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf, 90 size_t cnt, loff_t *ppos) 91 { 92 struct mei_device *dev = fp->private_data; 93 struct mei_cl *cl; 94 size_t bufsz = 1; 95 char *buf; 96 int i = 0; 97 int pos = 0; 98 int ret; 99 100 #define HDR " |me|host|state|rd|wr|\n" 101 102 if (!dev) 103 return -ENODEV; 104 105 mutex_lock(&dev->device_lock); 106 107 /* 108 * if the driver is not enabled the list won't be consistent, 109 * we output empty table 110 */ 111 if (dev->dev_state == MEI_DEV_ENABLED) 112 list_for_each_entry(cl, &dev->file_list, link) 113 bufsz++; 114 115 bufsz *= sizeof(HDR) + 1; 116 117 buf = kzalloc(bufsz, GFP_KERNEL); 118 if (!buf) { 119 mutex_unlock(&dev->device_lock); 120 return -ENOMEM; 121 } 122 123 pos += scnprintf(buf + pos, bufsz - pos, HDR); 124 #undef HDR 125 126 /* if the driver is not enabled the list won't be consistent */ 127 if (dev->dev_state != MEI_DEV_ENABLED) 128 goto out; 129 130 list_for_each_entry(cl, &dev->file_list, link) { 131 132 pos += scnprintf(buf + pos, bufsz - pos, 133 "%3d|%2d|%4d|%5d|%2d|%2d|\n", 134 i, mei_cl_me_id(cl), cl->host_client_id, cl->state, 135 !list_empty(&cl->rd_completed), cl->writing_state); 136 i++; 137 } 138 out: 139 mutex_unlock(&dev->device_lock); 140 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos); 141 kfree(buf); 142 return ret; 143 } 144 145 static const struct file_operations mei_dbgfs_fops_active = { 146 .open = simple_open, 147 .read = mei_dbgfs_read_active, 148 .llseek = generic_file_llseek, 149 }; 150 151 static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf, 152 size_t cnt, loff_t *ppos) 153 { 154 struct mei_device *dev = fp->private_data; 155 const size_t bufsz = 1024; 156 char *buf = kzalloc(bufsz, GFP_KERNEL); 157 int pos = 0; 158 int ret; 159 160 if (!buf) 161 return -ENOMEM; 162 163 pos += scnprintf(buf + pos, bufsz - pos, "dev: %s\n", 164 mei_dev_state_str(dev->dev_state)); 165 pos += scnprintf(buf + pos, bufsz - pos, "hbm: %s\n", 166 mei_hbm_state_str(dev->hbm_state)); 167 168 if (dev->hbm_state >= MEI_HBM_ENUM_CLIENTS && 169 dev->hbm_state <= MEI_HBM_STARTED) { 170 pos += scnprintf(buf + pos, bufsz - pos, "hbm features:\n"); 171 pos += scnprintf(buf + pos, bufsz - pos, "\tPG: %01d\n", 172 dev->hbm_f_pg_supported); 173 pos += scnprintf(buf + pos, bufsz - pos, "\tDC: %01d\n", 174 dev->hbm_f_dc_supported); 175 pos += scnprintf(buf + pos, bufsz - pos, "\tIE: %01d\n", 176 dev->hbm_f_ie_supported); 177 pos += scnprintf(buf + pos, bufsz - pos, "\tDOT: %01d\n", 178 dev->hbm_f_dot_supported); 179 pos += scnprintf(buf + pos, bufsz - pos, "\tEV: %01d\n", 180 dev->hbm_f_ev_supported); 181 pos += scnprintf(buf + pos, bufsz - pos, "\tFA: %01d\n", 182 dev->hbm_f_fa_supported); 183 } 184 185 pos += scnprintf(buf + pos, bufsz - pos, "pg: %s, %s\n", 186 mei_pg_is_enabled(dev) ? "ENABLED" : "DISABLED", 187 mei_pg_state_str(mei_pg_state(dev))); 188 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos); 189 kfree(buf); 190 return ret; 191 } 192 static const struct file_operations mei_dbgfs_fops_devstate = { 193 .open = simple_open, 194 .read = mei_dbgfs_read_devstate, 195 .llseek = generic_file_llseek, 196 }; 197 198 static ssize_t mei_dbgfs_write_allow_fa(struct file *file, 199 const char __user *user_buf, 200 size_t count, loff_t *ppos) 201 { 202 struct mei_device *dev; 203 int ret; 204 205 dev = container_of(file->private_data, 206 struct mei_device, allow_fixed_address); 207 208 ret = debugfs_write_file_bool(file, user_buf, count, ppos); 209 if (ret < 0) 210 return ret; 211 dev->override_fixed_address = true; 212 return ret; 213 } 214 215 static const struct file_operations mei_dbgfs_fops_allow_fa = { 216 .open = simple_open, 217 .read = debugfs_read_file_bool, 218 .write = mei_dbgfs_write_allow_fa, 219 .llseek = generic_file_llseek, 220 }; 221 222 /** 223 * mei_dbgfs_deregister - Remove the debugfs files and directories 224 * 225 * @dev: the mei device structure 226 */ 227 void mei_dbgfs_deregister(struct mei_device *dev) 228 { 229 if (!dev->dbgfs_dir) 230 return; 231 debugfs_remove_recursive(dev->dbgfs_dir); 232 dev->dbgfs_dir = NULL; 233 } 234 235 /** 236 * mei_dbgfs_register - Add the debugfs files 237 * 238 * @dev: the mei device structure 239 * @name: the mei device name 240 * 241 * Return: 0 on success, <0 on failure. 242 */ 243 int mei_dbgfs_register(struct mei_device *dev, const char *name) 244 { 245 struct dentry *dir, *f; 246 247 dir = debugfs_create_dir(name, NULL); 248 if (!dir) 249 return -ENOMEM; 250 251 dev->dbgfs_dir = dir; 252 253 f = debugfs_create_file("meclients", S_IRUSR, dir, 254 dev, &mei_dbgfs_fops_meclients); 255 if (!f) { 256 dev_err(dev->dev, "meclients: registration failed\n"); 257 goto err; 258 } 259 f = debugfs_create_file("active", S_IRUSR, dir, 260 dev, &mei_dbgfs_fops_active); 261 if (!f) { 262 dev_err(dev->dev, "active: registration failed\n"); 263 goto err; 264 } 265 f = debugfs_create_file("devstate", S_IRUSR, dir, 266 dev, &mei_dbgfs_fops_devstate); 267 if (!f) { 268 dev_err(dev->dev, "devstate: registration failed\n"); 269 goto err; 270 } 271 f = debugfs_create_file("allow_fixed_address", S_IRUSR | S_IWUSR, dir, 272 &dev->allow_fixed_address, 273 &mei_dbgfs_fops_allow_fa); 274 if (!f) { 275 dev_err(dev->dev, "allow_fixed_address: registration failed\n"); 276 goto err; 277 } 278 return 0; 279 err: 280 mei_dbgfs_deregister(dev); 281 return -ENODEV; 282 } 283 284