drivers/uwb/uwb-debug.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Ultra Wide Band
   4  * Debug support
   5  *
   6  * Copyright (C) 2005-2006 Intel Corporation
   7  * Inaky Perez-Gonzalez <[email protected]>
   8  * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
   9  *
  10  * FIXME: doc
  11  */
  12
  13 #include <linux/spinlock.h>
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/notifier.h>
  17 #include <linux/device.h>
  18 #include <linux/debugfs.h>
  19 #include <linux/uaccess.h>
  20 #include <linux/seq_file.h>
  21
  22 #include <linux/uwb/debug-cmd.h>
  23
  24 #include "uwb-internal.h"
  25
  26 /*
  27  * Debug interface
  28  *
  29  * Per radio controller debugfs files (in uwb/uwbN/):
  30  *
  31  * command: Flexible command interface (see <linux/uwb/debug-cmd.h>).
  32  *
  33  * reservations: information on reservations.
  34  *
  35  * accept: Set to true (Y or 1) to accept reservation requests from
  36  * peers.
  37  *
  38  * drp_avail: DRP availability information.
  39  */
  40
  41 struct uwb_dbg {
  42         struct uwb_pal pal;
  43
  44         bool accept;
  45         struct list_head rsvs;
  46
  47         struct dentry *root_d;
  48         struct dentry *command_f;
  49         struct dentry *reservations_f;
  50         struct dentry *accept_f;
  51         struct dentry *drp_avail_f;
  52         spinlock_t list_lock;
  53 };
  54
  55 static struct dentry *root_dir;
  56
  57 static void uwb_dbg_rsv_cb(struct uwb_rsv *rsv)
  58 {
  59         struct uwb_dbg *dbg = rsv->pal_priv;
  60
  61         uwb_rsv_dump("debug", rsv);
  62
  63         if (rsv->state == UWB_RSV_STATE_NONE) {
  64                 spin_lock(&dbg->list_lock);
  65                 list_del(&rsv->pal_node);
  66                 spin_unlock(&dbg->list_lock);
  67                 uwb_rsv_destroy(rsv);
  68         }
  69 }
  70
  71 static int cmd_rsv_establish(struct uwb_rc *rc,
  72                              struct uwb_dbg_cmd_rsv_establish *cmd)
  73 {
  74         struct uwb_mac_addr macaddr;
  75         struct uwb_rsv *rsv;
  76         struct uwb_dev *target;
  77         int ret;
  78
  79         memcpy(&macaddr, cmd->target, sizeof(macaddr));
  80         target = uwb_dev_get_by_macaddr(rc, &macaddr);
  81         if (target == NULL)
  82                 return -ENODEV;
  83
  84         rsv = uwb_rsv_create(rc, uwb_dbg_rsv_cb, rc->dbg);
  85         if (rsv == NULL) {
  86                 uwb_dev_put(target);
  87                 return -ENOMEM;
  88         }
  89
  90         rsv->target.type  = UWB_RSV_TARGET_DEV;
  91         rsv->target.dev   = target;
  92         rsv->type         = cmd->type;
  93         rsv->max_mas      = cmd->max_mas;
  94         rsv->min_mas      = cmd->min_mas;
  95         rsv->max_interval = cmd->max_interval;
  96
  97         ret = uwb_rsv_establish(rsv);
  98         if (ret)
  99                 uwb_rsv_destroy(rsv);
 100         else {
 101                 spin_lock(&(rc->dbg)->list_lock);
 102                 list_add_tail(&rsv->pal_node, &rc->dbg->rsvs);
 103                 spin_unlock(&(rc->dbg)->list_lock);
 104         }
 105         return ret;
 106 }
 107
 108 static int cmd_rsv_terminate(struct uwb_rc *rc,
 109                              struct uwb_dbg_cmd_rsv_terminate *cmd)
 110 {
 111         struct uwb_rsv *rsv, *found = NULL;
 112         int i = 0;
 113
 114         spin_lock(&(rc->dbg)->list_lock);
 115
 116         list_for_each_entry(rsv, &rc->dbg->rsvs, pal_node) {
 117                 if (i == cmd->index) {
 118                         found = rsv;
 119                         uwb_rsv_get(found);
 120                         break;
 121                 }
 122                 i++;
 123         }
 124
 125         spin_unlock(&(rc->dbg)->list_lock);
 126
 127         if (!found)
 128                 return -EINVAL;
 129
 130         uwb_rsv_terminate(found);
 131         uwb_rsv_put(found);
 132
 133         return 0;
 134 }
 135
 136 static int cmd_ie_add(struct uwb_rc *rc, struct uwb_dbg_cmd_ie *ie_to_add)
 137 {
 138         return uwb_rc_ie_add(rc,
 139                              (const struct uwb_ie_hdr *) ie_to_add->data,
 140                              ie_to_add->len);
 141 }
 142
 143 static int cmd_ie_rm(struct uwb_rc *rc, struct uwb_dbg_cmd_ie *ie_to_rm)
 144 {
 145         return uwb_rc_ie_rm(rc, ie_to_rm->data[0]);
 146 }
 147
 148 static ssize_t command_write(struct file *file, const char __user *buf,
 149                          size_t len, loff_t *off)
 150 {
 151         struct uwb_rc *rc = file->private_data;
 152         struct uwb_dbg_cmd cmd;
 153         int ret = 0;
 154
 155         if (len != sizeof(struct uwb_dbg_cmd))
 156                 return -EINVAL;
 157
 158         if (copy_from_user(&cmd, buf, len) != 0)
 159                 return -EFAULT;
 160
 161         switch (cmd.type) {
 162         case UWB_DBG_CMD_RSV_ESTABLISH:
 163                 ret = cmd_rsv_establish(rc, &cmd.rsv_establish);
 164                 break;
 165         case UWB_DBG_CMD_RSV_TERMINATE:
 166                 ret = cmd_rsv_terminate(rc, &cmd.rsv_terminate);
 167                 break;
 168         case UWB_DBG_CMD_IE_ADD:
 169                 ret = cmd_ie_add(rc, &cmd.ie_add);
 170                 break;
 171         case UWB_DBG_CMD_IE_RM:
 172                 ret = cmd_ie_rm(rc, &cmd.ie_rm);
 173                 break;
 174         case UWB_DBG_CMD_RADIO_START:
 175                 ret = uwb_radio_start(&rc->dbg->pal);
 176                 break;
 177         case UWB_DBG_CMD_RADIO_STOP:
 178                 uwb_radio_stop(&rc->dbg->pal);
 179                 break;
 180         default:
 181                 return -EINVAL;
 182         }
 183
 184         return ret < 0 ? ret : len;
 185 }
 186
 187 static const struct file_operations command_fops = {
 188         .open   = simple_open,
 189         .write  = command_write,
 190         .read   = NULL,
 191         .llseek = no_llseek,
 192         .owner  = THIS_MODULE,
 193 };
 194
 195 static int reservations_show(struct seq_file *s, void *p)
 196 {
 197         struct uwb_rc *rc = s->private;
 198         struct uwb_rsv *rsv;
 199
 200         mutex_lock(&rc->rsvs_mutex);
 201
 202         list_for_each_entry(rsv, &rc->reservations, rc_node) {
 203                 struct uwb_dev_addr devaddr;
 204                 char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE];
 205                 bool is_owner;
 206
 207                 uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr);
 208                 if (rsv->target.type == UWB_RSV_TARGET_DEV) {
 209                         devaddr = rsv->target.dev->dev_addr;
 210                         is_owner = &rc->uwb_dev == rsv->owner;
 211                 } else {
 212                         devaddr = rsv->target.devaddr;
 213                         is_owner = true;
 214                 }
 215                 uwb_dev_addr_print(target, sizeof(target), &devaddr);
 216
 217                 seq_printf(s, "%c %s -> %s: %s\n",
 218                            is_owner ? 'O' : 'T',
 219                            owner, target, uwb_rsv_state_str(rsv->state));
 220                 seq_printf(s, "  stream: %d  type: %s\n",
 221                            rsv->stream, uwb_rsv_type_str(rsv->type));
 222                 seq_printf(s, "  %*pb\n", UWB_NUM_MAS, rsv->mas.bm);
 223         }
 224
 225         mutex_unlock(&rc->rsvs_mutex);
 226
 227         return 0;
 228 }
 229 DEFINE_SHOW_ATTRIBUTE(reservations);
 230
 231 static int drp_avail_show(struct seq_file *s, void *p)
 232 {
 233         struct uwb_rc *rc = s->private;
 234
 235         seq_printf(s, "global:  %*pb\n", UWB_NUM_MAS, rc->drp_avail.global);
 236         seq_printf(s, "local:   %*pb\n", UWB_NUM_MAS, rc->drp_avail.local);
 237         seq_printf(s, "pending: %*pb\n", UWB_NUM_MAS, rc->drp_avail.pending);
 238
 239         return 0;
 240 }
 241 DEFINE_SHOW_ATTRIBUTE(drp_avail);
 242
 243 static void uwb_dbg_channel_changed(struct uwb_pal *pal, int channel)
 244 {
 245         struct device *dev = &pal->rc->uwb_dev.dev;
 246
 247         if (channel > 0)
 248                 dev_info(dev, "debug: channel %d started\n", channel);
 249         else
 250                 dev_info(dev, "debug: channel stopped\n");
 251 }
 252
 253 static void uwb_dbg_new_rsv(struct uwb_pal *pal, struct uwb_rsv *rsv)
 254 {
 255         struct uwb_dbg *dbg = container_of(pal, struct uwb_dbg, pal);
 256
 257         if (dbg->accept) {
 258                 spin_lock(&dbg->list_lock);
 259                 list_add_tail(&rsv->pal_node, &dbg->rsvs);
 260                 spin_unlock(&dbg->list_lock);
 261                 uwb_rsv_accept(rsv, uwb_dbg_rsv_cb, dbg);
 262         }
 263 }
 264
 265 /**
 266  * uwb_dbg_add_rc - add a debug interface for a radio controller
 267  * @rc: the radio controller
 268  */
 269 void uwb_dbg_add_rc(struct uwb_rc *rc)
 270 {
 271         rc->dbg = kzalloc(sizeof(struct uwb_dbg), GFP_KERNEL);
 272         if (rc->dbg == NULL)
 273                 return;
 274
 275         INIT_LIST_HEAD(&rc->dbg->rsvs);
 276         spin_lock_init(&(rc->dbg)->list_lock);
 277
 278         uwb_pal_init(&rc->dbg->pal);
 279         rc->dbg->pal.rc = rc;
 280         rc->dbg->pal.channel_changed = uwb_dbg_channel_changed;
 281         rc->dbg->pal.new_rsv = uwb_dbg_new_rsv;
 282         uwb_pal_register(&rc->dbg->pal);
 283
 284         if (root_dir) {
 285                 rc->dbg->root_d = debugfs_create_dir(dev_name(&rc->uwb_dev.dev),
 286                                                      root_dir);
 287                 rc->dbg->command_f = debugfs_create_file("command", 0200,
 288                                                          rc->dbg->root_d, rc,
 289                                                          &command_fops);
 290                 rc->dbg->reservations_f = debugfs_create_file("reservations", 0444,
 291                                                               rc->dbg->root_d, rc,
 292                                                               &reservations_fops);
 293                 rc->dbg->accept_f = debugfs_create_bool("accept", 0644,
 294                                                         rc->dbg->root_d,
 295                                                         &rc->dbg->accept);
 296                 rc->dbg->drp_avail_f = debugfs_create_file("drp_avail", 0444,
 297                                                            rc->dbg->root_d, rc,
 298                                                            &drp_avail_fops);
 299         }
 300 }
 301
 302 /**
 303  * uwb_dbg_del_rc - remove a radio controller's debug interface
 304  * @rc: the radio controller
 305  */
 306 void uwb_dbg_del_rc(struct uwb_rc *rc)
 307 {
 308         struct uwb_rsv *rsv, *t;
 309
 310         if (rc->dbg == NULL)
 311                 return;
 312
 313         list_for_each_entry_safe(rsv, t, &rc->dbg->rsvs, pal_node) {
 314                 uwb_rsv_terminate(rsv);
 315         }
 316
 317         uwb_pal_unregister(&rc->dbg->pal);
 318
 319         if (root_dir) {
 320                 debugfs_remove(rc->dbg->drp_avail_f);
 321                 debugfs_remove(rc->dbg->accept_f);
 322                 debugfs_remove(rc->dbg->reservations_f);
 323                 debugfs_remove(rc->dbg->command_f);
 324                 debugfs_remove(rc->dbg->root_d);
 325         }
 326 }
 327
 328 /**
 329  * uwb_dbg_exit - initialize the debug interface sub-module
 330  */
 331 void uwb_dbg_init(void)
 332 {
 333         root_dir = debugfs_create_dir("uwb", NULL);
 334 }
 335
 336 /**
 337  * uwb_dbg_exit - clean-up the debug interface sub-module
 338  */
 339 void uwb_dbg_exit(void)
 340 {
 341         debugfs_remove(root_dir);
 342 }
 343
 344 /**
 345  * uwb_dbg_create_pal_dir - create a debugfs directory for a PAL
 346  * @pal: The PAL.
 347  */
 348 struct dentry *uwb_dbg_create_pal_dir(struct uwb_pal *pal)
 349 {
 350         struct uwb_rc *rc = pal->rc;
 351
 352         if (root_dir && rc->dbg && rc->dbg->root_d && pal->name)
 353                 return debugfs_create_dir(pal->name, rc->dbg->root_d);
 354         return NULL;
 355 }