kernel/drivers/uwb/uwb-debug.c

   1 /*
   2  * Ultra Wide Band
   3  * Debug support
   4  *
   5  * Copyright (C) 2005-2006 Intel Corporation
   6  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
   7  * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License version
  11  * 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21  * 02110-1301, USA.
  22  *
  23  *
  24  * FIXME: doc
  25  */
  26
  27 #include <linux/spinlock.h>
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30 #include <linux/notifier.h>
  31 #include <linux/device.h>
  32 #include <linux/debugfs.h>
  33 #include <linux/uaccess.h>
  34 #include <linux/seq_file.h>
  35
  36 #include <linux/uwb/debug-cmd.h>
  37
  38 #include "uwb-internal.h"
  39
  40 /*
  41  * Debug interface
  42  *
  43  * Per radio controller debugfs files (in uwb/uwbN/):
  44  *
  45  * command: Flexible command interface (see <linux/uwb/debug-cmd.h>).
  46  *
  47  * reservations: information on reservations.
  48  *
  49  * accept: Set to true (Y or 1) to accept reservation requests from
  50  * peers.
  51  *
  52  * drp_avail: DRP availability information.
  53  */
  54
  55 struct uwb_dbg {
  56         struct uwb_pal pal;
  57
  58         u32 accept;
  59         struct list_head rsvs;
  60
  61         struct dentry *root_d;
  62         struct dentry *command_f;
  63         struct dentry *reservations_f;
  64         struct dentry *accept_f;
  65         struct dentry *drp_avail_f;
  66         spinlock_t list_lock;
  67 };
  68
  69 static struct dentry *root_dir;
  70
  71 static void uwb_dbg_rsv_cb(struct uwb_rsv *rsv)
  72 {
  73         struct uwb_dbg *dbg = rsv->pal_priv;
  74
  75         uwb_rsv_dump("debug", rsv);
  76
  77         if (rsv->state == UWB_RSV_STATE_NONE) {
  78                 spin_lock(&dbg->list_lock);
  79                 list_del(&rsv->pal_node);
  80                 spin_unlock(&dbg->list_lock);
  81                 uwb_rsv_destroy(rsv);
  82         }
  83 }
  84
  85 static int cmd_rsv_establish(struct uwb_rc *rc,
  86                              struct uwb_dbg_cmd_rsv_establish *cmd)
  87 {
  88         struct uwb_mac_addr macaddr;
  89         struct uwb_rsv *rsv;
  90         struct uwb_dev *target;
  91         int ret;
  92
  93         memcpy(&macaddr, cmd->target, sizeof(macaddr));
  94         target = uwb_dev_get_by_macaddr(rc, &macaddr);
  95         if (target == NULL)
  96                 return -ENODEV;
  97
  98         rsv = uwb_rsv_create(rc, uwb_dbg_rsv_cb, rc->dbg);
  99         if (rsv == NULL) {
 100                 uwb_dev_put(target);
 101                 return -ENOMEM;
 102         }
 103
 104         rsv->target.type  = UWB_RSV_TARGET_DEV;
 105         rsv->target.dev   = target;
 106         rsv->type         = cmd->type;
 107         rsv->max_mas      = cmd->max_mas;
 108         rsv->min_mas      = cmd->min_mas;
 109         rsv->max_interval = cmd->max_interval;
 110
 111         ret = uwb_rsv_establish(rsv);
 112         if (ret)
 113                 uwb_rsv_destroy(rsv);
 114         else {
 115                 spin_lock(&(rc->dbg)->list_lock);
 116                 list_add_tail(&rsv->pal_node, &rc->dbg->rsvs);
 117                 spin_unlock(&(rc->dbg)->list_lock);
 118         }
 119         return ret;
 120 }
 121
 122 static int cmd_rsv_terminate(struct uwb_rc *rc,
 123                              struct uwb_dbg_cmd_rsv_terminate *cmd)
 124 {
 125         struct uwb_rsv *rsv, *found = NULL;
 126         int i = 0;
 127
 128         spin_lock(&(rc->dbg)->list_lock);
 129
 130         list_for_each_entry(rsv, &rc->dbg->rsvs, pal_node) {
 131                 if (i == cmd->index) {
 132                         found = rsv;
 133                         uwb_rsv_get(found);
 134                         break;
 135                 }
 136                 i++;
 137         }
 138
 139         spin_unlock(&(rc->dbg)->list_lock);
 140
 141         if (!found)
 142                 return -EINVAL;
 143
 144         uwb_rsv_terminate(found);
 145         uwb_rsv_put(found);
 146
 147         return 0;
 148 }
 149
 150 static int cmd_ie_add(struct uwb_rc *rc, struct uwb_dbg_cmd_ie *ie_to_add)
 151 {
 152         return uwb_rc_ie_add(rc,
 153                              (const struct uwb_ie_hdr *) ie_to_add->data,
 154                              ie_to_add->len);
 155 }
 156
 157 static int cmd_ie_rm(struct uwb_rc *rc, struct uwb_dbg_cmd_ie *ie_to_rm)
 158 {
 159         return uwb_rc_ie_rm(rc, ie_to_rm->data[0]);
 160 }
 161
 162 static ssize_t command_write(struct file *file, const char __user *buf,
 163                          size_t len, loff_t *off)
 164 {
 165         struct uwb_rc *rc = file->private_data;
 166         struct uwb_dbg_cmd cmd;
 167         int ret = 0;
 168
 169         if (len != sizeof(struct uwb_dbg_cmd))
 170                 return -EINVAL;
 171
 172         if (copy_from_user(&cmd, buf, len) != 0)
 173                 return -EFAULT;
 174
 175         switch (cmd.type) {
 176         case UWB_DBG_CMD_RSV_ESTABLISH:
 177                 ret = cmd_rsv_establish(rc, &cmd.rsv_establish);
 178                 break;
 179         case UWB_DBG_CMD_RSV_TERMINATE:
 180                 ret = cmd_rsv_terminate(rc, &cmd.rsv_terminate);
 181                 break;
 182         case UWB_DBG_CMD_IE_ADD:
 183                 ret = cmd_ie_add(rc, &cmd.ie_add);
 184                 break;
 185         case UWB_DBG_CMD_IE_RM:
 186                 ret = cmd_ie_rm(rc, &cmd.ie_rm);
 187                 break;
 188         case UWB_DBG_CMD_RADIO_START:
 189                 ret = uwb_radio_start(&rc->dbg->pal);
 190                 break;
 191         case UWB_DBG_CMD_RADIO_STOP:
 192                 uwb_radio_stop(&rc->dbg->pal);
 193                 break;
 194         default:
 195                 return -EINVAL;
 196         }
 197
 198         return ret < 0 ? ret : len;
 199 }
 200
 201 static const struct file_operations command_fops = {
 202         .open   = simple_open,
 203         .write  = command_write,
 204         .read   = NULL,
 205         .llseek = no_llseek,
 206         .owner  = THIS_MODULE,
 207 };
 208
 209 static int reservations_print(struct seq_file *s, void *p)
 210 {
 211         struct uwb_rc *rc = s->private;
 212         struct uwb_rsv *rsv;
 213
 214         mutex_lock(&rc->rsvs_mutex);
 215
 216         list_for_each_entry(rsv, &rc->reservations, rc_node) {
 217                 struct uwb_dev_addr devaddr;
 218                 char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE];
 219                 bool is_owner;
 220
 221                 uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr);
 222                 if (rsv->target.type == UWB_RSV_TARGET_DEV) {
 223                         devaddr = rsv->target.dev->dev_addr;
 224                         is_owner = &rc->uwb_dev == rsv->owner;
 225                 } else {
 226                         devaddr = rsv->target.devaddr;
 227                         is_owner = true;
 228                 }
 229                 uwb_dev_addr_print(target, sizeof(target), &devaddr);
 230
 231                 seq_printf(s, "%c %s -> %s: %s\n",
 232                            is_owner ? 'O' : 'T',
 233                            owner, target, uwb_rsv_state_str(rsv->state));
 234                 seq_printf(s, "  stream: %d  type: %s\n",
 235                            rsv->stream, uwb_rsv_type_str(rsv->type));
 236                 seq_printf(s, "  %*pb\n", UWB_NUM_MAS, rsv->mas.bm);
 237         }
 238
 239         mutex_unlock(&rc->rsvs_mutex);
 240
 241         return 0;
 242 }
 243
 244 static int reservations_open(struct inode *inode, struct file *file)
 245 {
 246         return single_open(file, reservations_print, inode->i_private);
 247 }
 248
 249 static const struct file_operations reservations_fops = {
 250         .open    = reservations_open,
 251         .read    = seq_read,
 252         .llseek  = seq_lseek,
 253         .release = single_release,
 254         .owner   = THIS_MODULE,
 255 };
 256
 257 static int drp_avail_print(struct seq_file *s, void *p)
 258 {
 259         struct uwb_rc *rc = s->private;
 260
 261         seq_printf(s, "global:  %*pb\n", UWB_NUM_MAS, rc->drp_avail.global);
 262         seq_printf(s, "local:   %*pb\n", UWB_NUM_MAS, rc->drp_avail.local);
 263         seq_printf(s, "pending: %*pb\n", UWB_NUM_MAS, rc->drp_avail.pending);
 264
 265         return 0;
 266 }
 267
 268 static int drp_avail_open(struct inode *inode, struct file *file)
 269 {
 270         return single_open(file, drp_avail_print, inode->i_private);
 271 }
 272
 273 static const struct file_operations drp_avail_fops = {
 274         .open    = drp_avail_open,
 275         .read    = seq_read,
 276         .llseek  = seq_lseek,
 277         .release = single_release,
 278         .owner   = THIS_MODULE,
 279 };
 280
 281 static void uwb_dbg_channel_changed(struct uwb_pal *pal, int channel)
 282 {
 283         struct device *dev = &pal->rc->uwb_dev.dev;
 284
 285         if (channel > 0)
 286                 dev_info(dev, "debug: channel %d started\n", channel);
 287         else
 288                 dev_info(dev, "debug: channel stopped\n");
 289 }
 290
 291 static void uwb_dbg_new_rsv(struct uwb_pal *pal, struct uwb_rsv *rsv)
 292 {
 293         struct uwb_dbg *dbg = container_of(pal, struct uwb_dbg, pal);
 294
 295         if (dbg->accept) {
 296                 spin_lock(&dbg->list_lock);
 297                 list_add_tail(&rsv->pal_node, &dbg->rsvs);
 298                 spin_unlock(&dbg->list_lock);
 299                 uwb_rsv_accept(rsv, uwb_dbg_rsv_cb, dbg);
 300         }
 301 }
 302
 303 /**
 304  * uwb_dbg_add_rc - add a debug interface for a radio controller
 305  * @rc: the radio controller
 306  */
 307 void uwb_dbg_add_rc(struct uwb_rc *rc)
 308 {
 309         rc->dbg = kzalloc(sizeof(struct uwb_dbg), GFP_KERNEL);
 310         if (rc->dbg == NULL)
 311                 return;
 312
 313         INIT_LIST_HEAD(&rc->dbg->rsvs);
 314         spin_lock_init(&(rc->dbg)->list_lock);
 315
 316         uwb_pal_init(&rc->dbg->pal);
 317         rc->dbg->pal.rc = rc;
 318         rc->dbg->pal.channel_changed = uwb_dbg_channel_changed;
 319         rc->dbg->pal.new_rsv = uwb_dbg_new_rsv;
 320         uwb_pal_register(&rc->dbg->pal);
 321
 322         if (root_dir) {
 323                 rc->dbg->root_d = debugfs_create_dir(dev_name(&rc->uwb_dev.dev),
 324                                                      root_dir);
 325                 rc->dbg->command_f = debugfs_create_file("command", 0200,
 326                                                          rc->dbg->root_d, rc,
 327                                                          &command_fops);
 328                 rc->dbg->reservations_f = debugfs_create_file("reservations", 0444,
 329                                                               rc->dbg->root_d, rc,
 330                                                               &reservations_fops);
 331                 rc->dbg->accept_f = debugfs_create_bool("accept", 0644,
 332                                                         rc->dbg->root_d,
 333                                                         &rc->dbg->accept);
 334                 rc->dbg->drp_avail_f = debugfs_create_file("drp_avail", 0444,
 335                                                            rc->dbg->root_d, rc,
 336                                                            &drp_avail_fops);
 337         }
 338 }
 339
 340 /**
 341  * uwb_dbg_del_rc - remove a radio controller's debug interface
 342  * @rc: the radio controller
 343  */
 344 void uwb_dbg_del_rc(struct uwb_rc *rc)
 345 {
 346         struct uwb_rsv *rsv, *t;
 347
 348         if (rc->dbg == NULL)
 349                 return;
 350
 351         list_for_each_entry_safe(rsv, t, &rc->dbg->rsvs, pal_node) {
 352                 uwb_rsv_terminate(rsv);
 353         }
 354
 355         uwb_pal_unregister(&rc->dbg->pal);
 356
 357         if (root_dir) {
 358                 debugfs_remove(rc->dbg->drp_avail_f);
 359                 debugfs_remove(rc->dbg->accept_f);
 360                 debugfs_remove(rc->dbg->reservations_f);
 361                 debugfs_remove(rc->dbg->command_f);
 362                 debugfs_remove(rc->dbg->root_d);
 363         }
 364 }
 365
 366 /**
 367  * uwb_dbg_exit - initialize the debug interface sub-module
 368  */
 369 void uwb_dbg_init(void)
 370 {
 371         root_dir = debugfs_create_dir("uwb", NULL);
 372 }
 373
 374 /**
 375  * uwb_dbg_exit - clean-up the debug interface sub-module
 376  */
 377 void uwb_dbg_exit(void)
 378 {
 379         debugfs_remove(root_dir);
 380 }
 381
 382 /**
 383  * uwb_dbg_create_pal_dir - create a debugfs directory for a PAL
 384  * @pal: The PAL.
 385  */
 386 struct dentry *uwb_dbg_create_pal_dir(struct uwb_pal *pal)
 387 {
 388         struct uwb_rc *rc = pal->rc;
 389
 390         if (root_dir && rc->dbg && rc->dbg->root_d && pal->name)
 391                 return debugfs_create_dir(pal->name, rc->dbg->root_d);
 392         return NULL;
 393 }