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 int command_open(struct inode *inode, struct file *file)
 163 {
 164         file->private_data = inode->i_private;
 165
 166         return 0;
 167 }
 168
 169 static ssize_t command_write(struct file *file, const char __user *buf,
 170                          size_t len, loff_t *off)
 171 {
 172         struct uwb_rc *rc = file->private_data;
 173         struct uwb_dbg_cmd cmd;
 174         int ret = 0;
 175
 176         if (len != sizeof(struct uwb_dbg_cmd))
 177                 return -EINVAL;
 178
 179         if (copy_from_user(&cmd, buf, len) != 0)
 180                 return -EFAULT;
 181
 182         switch (cmd.type) {
 183         case UWB_DBG_CMD_RSV_ESTABLISH:
 184                 ret = cmd_rsv_establish(rc, &cmd.rsv_establish);
 185                 break;
 186         case UWB_DBG_CMD_RSV_TERMINATE:
 187                 ret = cmd_rsv_terminate(rc, &cmd.rsv_terminate);
 188                 break;
 189         case UWB_DBG_CMD_IE_ADD:
 190                 ret = cmd_ie_add(rc, &cmd.ie_add);
 191                 break;
 192         case UWB_DBG_CMD_IE_RM:
 193                 ret = cmd_ie_rm(rc, &cmd.ie_rm);
 194                 break;
 195         case UWB_DBG_CMD_RADIO_START:
 196                 ret = uwb_radio_start(&rc->dbg->pal);
 197                 break;
 198         case UWB_DBG_CMD_RADIO_STOP:
 199                 uwb_radio_stop(&rc->dbg->pal);
 200                 break;
 201         default:
 202                 return -EINVAL;
 203         }
 204
 205         return ret < 0 ? ret : len;
 206 }
 207
 208 static struct file_operations command_fops = {
 209         .open   = command_open,
 210         .write  = command_write,
 211         .read   = NULL,
 212         .llseek = no_llseek,
 213         .owner  = THIS_MODULE,
 214 };
 215
 216 static int reservations_print(struct seq_file *s, void *p)
 217 {
 218         struct uwb_rc *rc = s->private;
 219         struct uwb_rsv *rsv;
 220
 221         mutex_lock(&rc->rsvs_mutex);
 222
 223         list_for_each_entry(rsv, &rc->reservations, rc_node) {
 224                 struct uwb_dev_addr devaddr;
 225                 char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE];
 226                 bool is_owner;
 227                 char buf[72];
 228
 229                 uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr);
 230                 if (rsv->target.type == UWB_RSV_TARGET_DEV) {
 231                         devaddr = rsv->target.dev->dev_addr;
 232                         is_owner = &rc->uwb_dev == rsv->owner;
 233                 } else {
 234                         devaddr = rsv->target.devaddr;
 235                         is_owner = true;
 236                 }
 237                 uwb_dev_addr_print(target, sizeof(target), &devaddr);
 238
 239                 seq_printf(s, "%c %s -> %s: %s\n",
 240                            is_owner ? 'O' : 'T',
 241                            owner, target, uwb_rsv_state_str(rsv->state));
 242                 seq_printf(s, "  stream: %d  type: %s\n",
 243                            rsv->stream, uwb_rsv_type_str(rsv->type));
 244                 bitmap_scnprintf(buf, sizeof(buf), rsv->mas.bm, UWB_NUM_MAS);
 245                 seq_printf(s, "  %s\n", buf);
 246         }
 247
 248         mutex_unlock(&rc->rsvs_mutex);
 249
 250         return 0;
 251 }
 252
 253 static int reservations_open(struct inode *inode, struct file *file)
 254 {
 255         return single_open(file, reservations_print, inode->i_private);
 256 }
 257
 258 static struct file_operations reservations_fops = {
 259         .open    = reservations_open,
 260         .read    = seq_read,
 261         .llseek  = seq_lseek,
 262         .release = single_release,
 263         .owner   = THIS_MODULE,
 264 };
 265
 266 static int drp_avail_print(struct seq_file *s, void *p)
 267 {
 268         struct uwb_rc *rc = s->private;
 269         char buf[72];
 270
 271         bitmap_scnprintf(buf, sizeof(buf), rc->drp_avail.global, UWB_NUM_MAS);
 272         seq_printf(s, "global:  %s\n", buf);
 273         bitmap_scnprintf(buf, sizeof(buf), rc->drp_avail.local, UWB_NUM_MAS);
 274         seq_printf(s, "local:   %s\n", buf);
 275         bitmap_scnprintf(buf, sizeof(buf), rc->drp_avail.pending, UWB_NUM_MAS);
 276         seq_printf(s, "pending: %s\n", buf);
 277
 278         return 0;
 279 }
 280
 281 static int drp_avail_open(struct inode *inode, struct file *file)
 282 {
 283         return single_open(file, drp_avail_print, inode->i_private);
 284 }
 285
 286 static struct file_operations drp_avail_fops = {
 287         .open    = drp_avail_open,
 288         .read    = seq_read,
 289         .llseek  = seq_lseek,
 290         .release = single_release,
 291         .owner   = THIS_MODULE,
 292 };
 293
 294 static void uwb_dbg_channel_changed(struct uwb_pal *pal, int channel)
 295 {
 296         struct device *dev = &pal->rc->uwb_dev.dev;
 297
 298         if (channel > 0)
 299                 dev_info(dev, "debug: channel %d started\n", channel);
 300         else
 301                 dev_info(dev, "debug: channel stopped\n");
 302 }
 303
 304 static void uwb_dbg_new_rsv(struct uwb_pal *pal, struct uwb_rsv *rsv)
 305 {
 306         struct uwb_dbg *dbg = container_of(pal, struct uwb_dbg, pal);
 307
 308         if (dbg->accept) {
 309                 spin_lock(&dbg->list_lock);
 310                 list_add_tail(&rsv->pal_node, &dbg->rsvs);
 311                 spin_unlock(&dbg->list_lock);
 312                 uwb_rsv_accept(rsv, uwb_dbg_rsv_cb, dbg);
 313         }
 314 }
 315
 316 /**
 317  * uwb_dbg_add_rc - add a debug interface for a radio controller
 318  * @rc: the radio controller
 319  */
 320 void uwb_dbg_add_rc(struct uwb_rc *rc)
 321 {
 322         rc->dbg = kzalloc(sizeof(struct uwb_dbg), GFP_KERNEL);
 323         if (rc->dbg == NULL)
 324                 return;
 325
 326         INIT_LIST_HEAD(&rc->dbg->rsvs);
 327         spin_lock_init(&(rc->dbg)->list_lock);
 328
 329         uwb_pal_init(&rc->dbg->pal);
 330         rc->dbg->pal.rc = rc;
 331         rc->dbg->pal.channel_changed = uwb_dbg_channel_changed;
 332         rc->dbg->pal.new_rsv = uwb_dbg_new_rsv;
 333         uwb_pal_register(&rc->dbg->pal);
 334
 335         if (root_dir) {
 336                 rc->dbg->root_d = debugfs_create_dir(dev_name(&rc->uwb_dev.dev),
 337                                                      root_dir);
 338                 rc->dbg->command_f = debugfs_create_file("command", 0200,
 339                                                          rc->dbg->root_d, rc,
 340                                                          &command_fops);
 341                 rc->dbg->reservations_f = debugfs_create_file("reservations", 0444,
 342                                                               rc->dbg->root_d, rc,
 343                                                               &reservations_fops);
 344                 rc->dbg->accept_f = debugfs_create_bool("accept", 0644,
 345                                                         rc->dbg->root_d,
 346                                                         &rc->dbg->accept);
 347                 rc->dbg->drp_avail_f = debugfs_create_file("drp_avail", 0444,
 348                                                            rc->dbg->root_d, rc,
 349                                                            &drp_avail_fops);
 350         }
 351 }
 352
 353 /**
 354  * uwb_dbg_del_rc - remove a radio controller's debug interface
 355  * @rc: the radio controller
 356  */
 357 void uwb_dbg_del_rc(struct uwb_rc *rc)
 358 {
 359         struct uwb_rsv *rsv, *t;
 360
 361         if (rc->dbg == NULL)
 362                 return;
 363
 364         list_for_each_entry_safe(rsv, t, &rc->dbg->rsvs, pal_node) {
 365                 uwb_rsv_terminate(rsv);
 366         }
 367
 368         uwb_pal_unregister(&rc->dbg->pal);
 369
 370         if (root_dir) {
 371                 debugfs_remove(rc->dbg->drp_avail_f);
 372                 debugfs_remove(rc->dbg->accept_f);
 373                 debugfs_remove(rc->dbg->reservations_f);
 374                 debugfs_remove(rc->dbg->command_f);
 375                 debugfs_remove(rc->dbg->root_d);
 376         }
 377 }
 378
 379 /**
 380  * uwb_dbg_exit - initialize the debug interface sub-module
 381  */
 382 void uwb_dbg_init(void)
 383 {
 384         root_dir = debugfs_create_dir("uwb", NULL);
 385 }
 386
 387 /**
 388  * uwb_dbg_exit - clean-up the debug interface sub-module
 389  */
 390 void uwb_dbg_exit(void)
 391 {
 392         debugfs_remove(root_dir);
 393 }
 394
 395 /**
 396  * uwb_dbg_create_pal_dir - create a debugfs directory for a PAL
 397  * @pal: The PAL.
 398  */
 399 struct dentry *uwb_dbg_create_pal_dir(struct uwb_pal *pal)
 400 {
 401         struct uwb_rc *rc = pal->rc;
 402
 403         if (root_dir && rc->dbg && rc->dbg->root_d && pal->name)
 404                 return debugfs_create_dir(pal->name, rc->dbg->root_d);
 405         return NULL;
 406 }