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  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License version
  10  * 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  *
  22  *
  23  * FIXME: doc
  24  */
  25
  26 #include <linux/spinlock.h>
  27 #include <linux/module.h>
  28 #include <linux/slab.h>
  29 #include <linux/notifier.h>
  30 #include <linux/device.h>
  31 #include <linux/debugfs.h>
  32 #include <linux/uaccess.h>
  33 #include <linux/seq_file.h>
  34
  35 #include <linux/uwb/debug-cmd.h>
  36 #define D_LOCAL 0
  37 #include <linux/uwb/debug.h>
  38
  39 #include "uwb-internal.h"
  40
  41 void dump_bytes(struct device *dev, const void *_buf, size_t rsize)
  42 {
  43         const char *buf = _buf;
  44         char line[32];
  45         size_t offset = 0;
  46         int cnt, cnt2;
  47         for (cnt = 0; cnt < rsize; cnt += 8) {
  48                 size_t rtop = rsize - cnt < 8 ? rsize - cnt : 8;
  49                 for (offset = cnt2 = 0; cnt2 < rtop; cnt2++) {
  50                         offset += scnprintf(line + offset, sizeof(line) - offset,
  51                                             "%02x ", buf[cnt + cnt2] & 0xff);
  52                 }
  53                 if (dev)
  54                         dev_info(dev, "%s\n", line);
  55                 else
  56                         printk(KERN_INFO "%s\n", line);
  57         }
  58 }
  59 EXPORT_SYMBOL_GPL(dump_bytes);
  60
  61 /*
  62  * Debug interface
  63  *
  64  * Per radio controller debugfs files (in uwb/uwbN/):
  65  *
  66  * command: Flexible command interface (see <linux/uwb/debug-cmd.h>).
  67  *
  68  * reservations: information on reservations.
  69  *
  70  * accept: Set to true (Y or 1) to accept reservation requests from
  71  * peers.
  72  *
  73  * drp_avail: DRP availability information.
  74  */
  75
  76 struct uwb_dbg {
  77         struct uwb_pal pal;
  78
  79         u32 accept;
  80         struct list_head rsvs;
  81
  82         struct dentry *root_d;
  83         struct dentry *command_f;
  84         struct dentry *reservations_f;
  85         struct dentry *accept_f;
  86         struct dentry *drp_avail_f;
  87 };
  88
  89 static struct dentry *root_dir;
  90
  91 static void uwb_dbg_rsv_cb(struct uwb_rsv *rsv)
  92 {
  93         struct uwb_rc *rc = rsv->rc;
  94         struct device *dev = &rc->uwb_dev.dev;
  95         struct uwb_dev_addr devaddr;
  96         char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE];
  97
  98         uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr);
  99         if (rsv->target.type == UWB_RSV_TARGET_DEV)
 100                 devaddr = rsv->target.dev->dev_addr;
 101         else
 102                 devaddr = rsv->target.devaddr;
 103         uwb_dev_addr_print(target, sizeof(target), &devaddr);
 104
 105         dev_dbg(dev, "debug: rsv %s -> %s: %s\n",
 106                 owner, target, uwb_rsv_state_str(rsv->state));
 107 }
 108
 109 static int cmd_rsv_establish(struct uwb_rc *rc,
 110                              struct uwb_dbg_cmd_rsv_establish *cmd)
 111 {
 112         struct uwb_mac_addr macaddr;
 113         struct uwb_rsv *rsv;
 114         struct uwb_dev *target;
 115         int ret;
 116
 117         memcpy(&macaddr, cmd->target, sizeof(macaddr));
 118         target = uwb_dev_get_by_macaddr(rc, &macaddr);
 119         if (target == NULL)
 120                 return -ENODEV;
 121
 122         rsv = uwb_rsv_create(rc, uwb_dbg_rsv_cb, NULL);
 123         if (rsv == NULL) {
 124                 uwb_dev_put(target);
 125                 return -ENOMEM;
 126         }
 127
 128         rsv->owner       = &rc->uwb_dev;
 129         rsv->target.type = UWB_RSV_TARGET_DEV;
 130         rsv->target.dev  = target;
 131         rsv->type        = cmd->type;
 132         rsv->max_mas     = cmd->max_mas;
 133         rsv->min_mas     = cmd->min_mas;
 134         rsv->sparsity    = cmd->sparsity;
 135
 136         ret = uwb_rsv_establish(rsv);
 137         if (ret)
 138                 uwb_rsv_destroy(rsv);
 139         else
 140                 list_add_tail(&rsv->pal_node, &rc->dbg->rsvs);
 141
 142         return ret;
 143 }
 144
 145 static int cmd_rsv_terminate(struct uwb_rc *rc,
 146                              struct uwb_dbg_cmd_rsv_terminate *cmd)
 147 {
 148         struct uwb_rsv *rsv, *found = NULL;
 149         int i = 0;
 150
 151         list_for_each_entry(rsv, &rc->dbg->rsvs, pal_node) {
 152                 if (i == cmd->index) {
 153                         found = rsv;
 154                         break;
 155                 }
 156         }
 157         if (!found)
 158                 return -EINVAL;
 159
 160         list_del(&found->pal_node);
 161         uwb_rsv_terminate(found);
 162
 163         return 0;
 164 }
 165
 166 static int command_open(struct inode *inode, struct file *file)
 167 {
 168         file->private_data = inode->i_private;
 169
 170         return 0;
 171 }
 172
 173 static ssize_t command_write(struct file *file, const char __user *buf,
 174                          size_t len, loff_t *off)
 175 {
 176         struct uwb_rc *rc = file->private_data;
 177         struct uwb_dbg_cmd cmd;
 178         int ret;
 179
 180         if (len != sizeof(struct uwb_dbg_cmd))
 181                 return -EINVAL;
 182
 183         if (copy_from_user(&cmd, buf, len) != 0)
 184                 return -EFAULT;
 185
 186         switch (cmd.type) {
 187         case UWB_DBG_CMD_RSV_ESTABLISH:
 188                 ret = cmd_rsv_establish(rc, &cmd.rsv_establish);
 189                 break;
 190         case UWB_DBG_CMD_RSV_TERMINATE:
 191                 ret = cmd_rsv_terminate(rc, &cmd.rsv_terminate);
 192                 break;
 193         default:
 194                 return -EINVAL;
 195         }
 196
 197         return ret < 0 ? ret : len;
 198 }
 199
 200 static struct file_operations command_fops = {
 201         .open   = command_open,
 202         .write  = command_write,
 203         .read   = NULL,
 204         .llseek = no_llseek,
 205         .owner  = THIS_MODULE,
 206 };
 207
 208 static int reservations_print(struct seq_file *s, void *p)
 209 {
 210         struct uwb_rc *rc = s->private;
 211         struct uwb_rsv *rsv;
 212
 213         mutex_lock(&rc->rsvs_mutex);
 214
 215         list_for_each_entry(rsv, &rc->reservations, rc_node) {
 216                 struct uwb_dev_addr devaddr;
 217                 char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE];
 218                 bool is_owner;
 219                 char buf[72];
 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                 bitmap_scnprintf(buf, sizeof(buf), rsv->mas.bm, UWB_NUM_MAS);
 237                 seq_printf(s, "  %s\n", buf);
 238         }
 239
 240         mutex_unlock(&rc->rsvs_mutex);
 241
 242         return 0;
 243 }
 244
 245 static int reservations_open(struct inode *inode, struct file *file)
 246 {
 247         return single_open(file, reservations_print, inode->i_private);
 248 }
 249
 250 static struct file_operations reservations_fops = {
 251         .open    = reservations_open,
 252         .read    = seq_read,
 253         .llseek  = seq_lseek,
 254         .release = single_release,
 255         .owner   = THIS_MODULE,
 256 };
 257
 258 static int drp_avail_print(struct seq_file *s, void *p)
 259 {
 260         struct uwb_rc *rc = s->private;
 261         char buf[72];
 262
 263         bitmap_scnprintf(buf, sizeof(buf), rc->drp_avail.global, UWB_NUM_MAS);
 264         seq_printf(s, "global:  %s\n", buf);
 265         bitmap_scnprintf(buf, sizeof(buf), rc->drp_avail.local, UWB_NUM_MAS);
 266         seq_printf(s, "local:   %s\n", buf);
 267         bitmap_scnprintf(buf, sizeof(buf), rc->drp_avail.pending, UWB_NUM_MAS);
 268         seq_printf(s, "pending: %s\n", buf);
 269
 270         return 0;
 271 }
 272
 273 static int drp_avail_open(struct inode *inode, struct file *file)
 274 {
 275         return single_open(file, drp_avail_print, inode->i_private);
 276 }
 277
 278 static struct file_operations drp_avail_fops = {
 279         .open    = drp_avail_open,
 280         .read    = seq_read,
 281         .llseek  = seq_lseek,
 282         .release = single_release,
 283         .owner   = THIS_MODULE,
 284 };
 285
 286 static void uwb_dbg_new_rsv(struct uwb_rsv *rsv)
 287 {
 288         struct uwb_rc *rc = rsv->rc;
 289
 290         if (rc->dbg->accept)
 291                 uwb_rsv_accept(rsv, uwb_dbg_rsv_cb, NULL);
 292 }
 293
 294 /**
 295  * uwb_dbg_add_rc - add a debug interface for a radio controller
 296  * @rc: the radio controller
 297  */
 298 void uwb_dbg_add_rc(struct uwb_rc *rc)
 299 {
 300         rc->dbg = kzalloc(sizeof(struct uwb_dbg), GFP_KERNEL);
 301         if (rc->dbg == NULL)
 302                 return;
 303
 304         INIT_LIST_HEAD(&rc->dbg->rsvs);
 305
 306         uwb_pal_init(&rc->dbg->pal);
 307         rc->dbg->pal.new_rsv = uwb_dbg_new_rsv;
 308         uwb_pal_register(rc, &rc->dbg->pal);
 309         if (root_dir) {
 310                 rc->dbg->root_d = debugfs_create_dir(dev_name(&rc->uwb_dev.dev),
 311                                                      root_dir);
 312                 rc->dbg->command_f = debugfs_create_file("command", 0200,
 313                                                          rc->dbg->root_d, rc,
 314                                                          &command_fops);
 315                 rc->dbg->reservations_f = debugfs_create_file("reservations", 0444,
 316                                                               rc->dbg->root_d, rc,
 317                                                               &reservations_fops);
 318                 rc->dbg->accept_f = debugfs_create_bool("accept", 0644,
 319                                                         rc->dbg->root_d,
 320                                                         &rc->dbg->accept);
 321                 rc->dbg->drp_avail_f = debugfs_create_file("drp_avail", 0444,
 322                                                            rc->dbg->root_d, rc,
 323                                                            &drp_avail_fops);
 324         }
 325 }
 326
 327 /**
 328  * uwb_dbg_add_rc - remove a radio controller's debug interface
 329  * @rc: the radio controller
 330  */
 331 void uwb_dbg_del_rc(struct uwb_rc *rc)
 332 {
 333         struct uwb_rsv *rsv, *t;
 334
 335         if (rc->dbg == NULL)
 336                 return;
 337
 338         list_for_each_entry_safe(rsv, t, &rc->dbg->rsvs, pal_node) {
 339                 uwb_rsv_destroy(rsv);
 340         }
 341
 342         uwb_pal_unregister(rc, &rc->dbg->pal);
 343
 344         if (root_dir) {
 345                 debugfs_remove(rc->dbg->drp_avail_f);
 346                 debugfs_remove(rc->dbg->accept_f);
 347                 debugfs_remove(rc->dbg->reservations_f);
 348                 debugfs_remove(rc->dbg->command_f);
 349                 debugfs_remove(rc->dbg->root_d);
 350         }
 351 }
 352
 353 /**
 354  * uwb_dbg_exit - initialize the debug interface sub-module
 355  */
 356 void uwb_dbg_init(void)
 357 {
 358         root_dir = debugfs_create_dir("uwb", NULL);
 359 }
 360
 361 /**
 362  * uwb_dbg_exit - clean-up the debug interface sub-module
 363  */
 364 void uwb_dbg_exit(void)
 365 {
 366         debugfs_remove(root_dir);
 367 }