kernel/drivers/net/wireless/b43legacy/debugfs.c

   1 /*
   2
   3   Broadcom B43legacy wireless driver
   4
   5   debugfs driver debugging code
   6
   7   Copyright (c) 2005-2007 Michael Buesch <m@bues.ch>
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; either version 2 of the License, or
  12   (at your option) any later version.
  13
  14   This program is distributed in the hope that it will be useful,
  15   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17   GNU General Public License for more details.
  18
  19   You should have received a copy of the GNU General Public License
  20   along with this program; see the file COPYING.  If not, write to
  21   the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  22   Boston, MA 02110-1301, USA.
  23
  24 */
  25
  26 #include <linux/fs.h>
  27 #include <linux/debugfs.h>
  28 #include <linux/slab.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/pci.h>
  31 #include <linux/mutex.h>
  32
  33 #include "b43legacy.h"
  34 #include "main.h"
  35 #include "debugfs.h"
  36 #include "dma.h"
  37 #include "pio.h"
  38 #include "xmit.h"
  39
  40
  41 /* The root directory. */
  42 static struct dentry *rootdir;
  43
  44 struct b43legacy_debugfs_fops {
  45         ssize_t (*read)(struct b43legacy_wldev *dev, char *buf, size_t bufsize);
  46         int (*write)(struct b43legacy_wldev *dev, const char *buf, size_t count);
  47         struct file_operations fops;
  48         /* Offset of struct b43legacy_dfs_file in struct b43legacy_dfsentry */
  49         size_t file_struct_offset;
  50         /* Take wl->irq_lock before calling read/write? */
  51         bool take_irqlock;
  52 };
  53
  54 static inline
  55 struct b43legacy_dfs_file * fops_to_dfs_file(struct b43legacy_wldev *dev,
  56                                        const struct b43legacy_debugfs_fops *dfops)
  57 {
  58         void *p;
  59
  60         p = dev->dfsentry;
  61         p += dfops->file_struct_offset;
  62
  63         return p;
  64 }
  65
  66
  67 #define fappend(fmt, x...)      \
  68         do {                                                    \
  69                 if (bufsize - count)                            \
  70                         count += snprintf(buf + count,          \
  71                                           bufsize - count,      \
  72                                           fmt , ##x);           \
  73                 else                                            \
  74                         printk(KERN_ERR "b43legacy: fappend overflow\n"); \
  75         } while (0)
  76
  77
  78 /* wl->irq_lock is locked */
  79 static ssize_t tsf_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize)
  80 {
  81         ssize_t count = 0;
  82         u64 tsf;
  83
  84         b43legacy_tsf_read(dev, &tsf);
  85         fappend("0x%08x%08x\n",
  86                 (unsigned int)((tsf & 0xFFFFFFFF00000000ULL) >> 32),
  87                 (unsigned int)(tsf & 0xFFFFFFFFULL));
  88
  89         return count;
  90 }
  91
  92 /* wl->irq_lock is locked */
  93 static int tsf_write_file(struct b43legacy_wldev *dev, const char *buf, size_t count)
  94 {
  95         u64 tsf;
  96
  97         if (sscanf(buf, "%llu", (unsigned long long *)(&tsf)) != 1)
  98                 return -EINVAL;
  99         b43legacy_tsf_write(dev, tsf);
 100
 101         return 0;
 102 }
 103
 104 /* wl->irq_lock is locked */
 105 static ssize_t ucode_regs_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize)
 106 {
 107         ssize_t count = 0;
 108         int i;
 109
 110         for (i = 0; i < 64; i++) {
 111                 fappend("r%d = 0x%04x\n", i,
 112                         b43legacy_shm_read16(dev, B43legacy_SHM_WIRELESS, i));
 113         }
 114
 115         return count;
 116 }
 117
 118 /* wl->irq_lock is locked */
 119 static ssize_t shm_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize)
 120 {
 121         ssize_t count = 0;
 122         int i;
 123         u16 tmp;
 124         __le16 *le16buf = (__le16 *)buf;
 125
 126         for (i = 0; i < 0x1000; i++) {
 127                 if (bufsize < sizeof(tmp))
 128                         break;
 129                 tmp = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED, 2 * i);
 130                 le16buf[i] = cpu_to_le16(tmp);
 131                 count += sizeof(tmp);
 132                 bufsize -= sizeof(tmp);
 133         }
 134
 135         return count;
 136 }
 137
 138 static ssize_t txstat_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize)
 139 {
 140         struct b43legacy_txstatus_log *log = &dev->dfsentry->txstatlog;
 141         ssize_t count = 0;
 142         unsigned long flags;
 143         int i, idx;
 144         struct b43legacy_txstatus *stat;
 145
 146         spin_lock_irqsave(&log->lock, flags);
 147         if (log->end < 0) {
 148                 fappend("Nothing transmitted, yet\n");
 149                 goto out_unlock;
 150         }
 151         fappend("b43legacy TX status reports:\n\n"
 152                 "index | cookie | seq | phy_stat | frame_count | "
 153                 "rts_count | supp_reason | pm_indicated | "
 154                 "intermediate | for_ampdu | acked\n" "---\n");
 155         i = log->end + 1;
 156         idx = 0;
 157         while (1) {
 158                 if (i == B43legacy_NR_LOGGED_TXSTATUS)
 159                         i = 0;
 160                 stat = &(log->log[i]);
 161                 if (stat->cookie) {
 162                         fappend("%03d | "
 163                                 "0x%04X | 0x%04X | 0x%02X | "
 164                                 "0x%X | 0x%X | "
 165                                 "%u | %u | "
 166                                 "%u | %u | %u\n",
 167                                 idx,
 168                                 stat->cookie, stat->seq, stat->phy_stat,
 169                                 stat->frame_count, stat->rts_count,
 170                                 stat->supp_reason, stat->pm_indicated,
 171                                 stat->intermediate, stat->for_ampdu,
 172                                 stat->acked);
 173                         idx++;
 174                 }
 175                 if (i == log->end)
 176                         break;
 177                 i++;
 178         }
 179 out_unlock:
 180         spin_unlock_irqrestore(&log->lock, flags);
 181
 182         return count;
 183 }
 184
 185 /* wl->irq_lock is locked */
 186 static int restart_write_file(struct b43legacy_wldev *dev, const char *buf, size_t count)
 187 {
 188         int err = 0;
 189
 190         if (count > 0 && buf[0] == '1') {
 191                 b43legacy_controller_restart(dev, "manually restarted");
 192         } else
 193                 err = -EINVAL;
 194
 195         return err;
 196 }
 197
 198 #undef fappend
 199
 200 static ssize_t b43legacy_debugfs_read(struct file *file, char __user *userbuf,
 201                                 size_t count, loff_t *ppos)
 202 {
 203         struct b43legacy_wldev *dev;
 204         struct b43legacy_debugfs_fops *dfops;
 205         struct b43legacy_dfs_file *dfile;
 206         ssize_t uninitialized_var(ret);
 207         char *buf;
 208         const size_t bufsize = 1024 * 16; /* 16 KiB buffer */
 209         const size_t buforder = get_order(bufsize);
 210         int err = 0;
 211
 212         if (!count)
 213                 return 0;
 214         dev = file->private_data;
 215         if (!dev)
 216                 return -ENODEV;
 217
 218         mutex_lock(&dev->wl->mutex);
 219         if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED) {
 220                 err = -ENODEV;
 221                 goto out_unlock;
 222         }
 223
 224         dfops = container_of(file->f_op, struct b43legacy_debugfs_fops, fops);
 225         if (!dfops->read) {
 226                 err = -ENOSYS;
 227                 goto out_unlock;
 228         }
 229         dfile = fops_to_dfs_file(dev, dfops);
 230
 231         if (!dfile->buffer) {
 232                 buf = (char *)__get_free_pages(GFP_KERNEL, buforder);
 233                 if (!buf) {
 234                         err = -ENOMEM;
 235                         goto out_unlock;
 236                 }
 237                 memset(buf, 0, bufsize);
 238                 if (dfops->take_irqlock) {
 239                         spin_lock_irq(&dev->wl->irq_lock);
 240                         ret = dfops->read(dev, buf, bufsize);
 241                         spin_unlock_irq(&dev->wl->irq_lock);
 242                 } else
 243                         ret = dfops->read(dev, buf, bufsize);
 244                 if (ret <= 0) {
 245                         free_pages((unsigned long)buf, buforder);
 246                         err = ret;
 247                         goto out_unlock;
 248                 }
 249                 dfile->data_len = ret;
 250                 dfile->buffer = buf;
 251         }
 252
 253         ret = simple_read_from_buffer(userbuf, count, ppos,
 254                                       dfile->buffer,
 255                                       dfile->data_len);
 256         if (*ppos >= dfile->data_len) {
 257                 free_pages((unsigned long)dfile->buffer, buforder);
 258                 dfile->buffer = NULL;
 259                 dfile->data_len = 0;
 260         }
 261 out_unlock:
 262         mutex_unlock(&dev->wl->mutex);
 263
 264         return err ? err : ret;
 265 }
 266
 267 static ssize_t b43legacy_debugfs_write(struct file *file,
 268                                  const char __user *userbuf,
 269                                  size_t count, loff_t *ppos)
 270 {
 271         struct b43legacy_wldev *dev;
 272         struct b43legacy_debugfs_fops *dfops;
 273         char *buf;
 274         int err = 0;
 275
 276         if (!count)
 277                 return 0;
 278         if (count > PAGE_SIZE)
 279                 return -E2BIG;
 280         dev = file->private_data;
 281         if (!dev)
 282                 return -ENODEV;
 283
 284         mutex_lock(&dev->wl->mutex);
 285         if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED) {
 286                 err = -ENODEV;
 287                 goto out_unlock;
 288         }
 289
 290         dfops = container_of(file->f_op, struct b43legacy_debugfs_fops, fops);
 291         if (!dfops->write) {
 292                 err = -ENOSYS;
 293                 goto out_unlock;
 294         }
 295
 296         buf = (char *)get_zeroed_page(GFP_KERNEL);
 297         if (!buf) {
 298                 err = -ENOMEM;
 299                 goto out_unlock;
 300         }
 301         if (copy_from_user(buf, userbuf, count)) {
 302                 err = -EFAULT;
 303                 goto out_freepage;
 304         }
 305         if (dfops->take_irqlock) {
 306                 spin_lock_irq(&dev->wl->irq_lock);
 307                 err = dfops->write(dev, buf, count);
 308                 spin_unlock_irq(&dev->wl->irq_lock);
 309         } else
 310                 err = dfops->write(dev, buf, count);
 311         if (err)
 312                 goto out_freepage;
 313
 314 out_freepage:
 315         free_page((unsigned long)buf);
 316 out_unlock:
 317         mutex_unlock(&dev->wl->mutex);
 318
 319         return err ? err : count;
 320 }
 321
 322
 323 #define B43legacy_DEBUGFS_FOPS(name, _read, _write, _take_irqlock)      \
 324         static struct b43legacy_debugfs_fops fops_##name = {            \
 325                 .read   = _read,                                \
 326                 .write  = _write,                               \
 327                 .fops   = {                                     \
 328                         .open   = simple_open,                          \
 329                         .read   = b43legacy_debugfs_read,               \
 330                         .write  = b43legacy_debugfs_write,              \
 331                         .llseek = generic_file_llseek,                  \
 332                 },                                              \
 333                 .file_struct_offset = offsetof(struct b43legacy_dfsentry, \
 334                                                file_##name),    \
 335                 .take_irqlock   = _take_irqlock,                \
 336         }
 337
 338 B43legacy_DEBUGFS_FOPS(tsf, tsf_read_file, tsf_write_file, 1);
 339 B43legacy_DEBUGFS_FOPS(ucode_regs, ucode_regs_read_file, NULL, 1);
 340 B43legacy_DEBUGFS_FOPS(shm, shm_read_file, NULL, 1);
 341 B43legacy_DEBUGFS_FOPS(txstat, txstat_read_file, NULL, 0);
 342 B43legacy_DEBUGFS_FOPS(restart, NULL, restart_write_file, 1);
 343
 344
 345 int b43legacy_debug(struct b43legacy_wldev *dev, enum b43legacy_dyndbg feature)
 346 {
 347         return !!(dev->dfsentry && dev->dfsentry->dyn_debug[feature]);
 348 }
 349
 350 static void b43legacy_remove_dynamic_debug(struct b43legacy_wldev *dev)
 351 {
 352         struct b43legacy_dfsentry *e = dev->dfsentry;
 353         int i;
 354
 355         for (i = 0; i < __B43legacy_NR_DYNDBG; i++)
 356                 debugfs_remove(e->dyn_debug_dentries[i]);
 357 }
 358
 359 static void b43legacy_add_dynamic_debug(struct b43legacy_wldev *dev)
 360 {
 361         struct b43legacy_dfsentry *e = dev->dfsentry;
 362         struct dentry *d;
 363
 364 #define add_dyn_dbg(name, id, initstate) do {           \
 365         e->dyn_debug[id] = (initstate);                 \
 366         d = debugfs_create_bool(name, 0600, e->subdir,  \
 367                                 &(e->dyn_debug[id]));   \
 368         if (!IS_ERR(d))                                 \
 369                 e->dyn_debug_dentries[id] = d;          \
 370                                 } while (0)
 371
 372         add_dyn_dbg("debug_xmitpower", B43legacy_DBG_XMITPOWER, 0);
 373         add_dyn_dbg("debug_dmaoverflow", B43legacy_DBG_DMAOVERFLOW, 0);
 374         add_dyn_dbg("debug_dmaverbose", B43legacy_DBG_DMAVERBOSE, 0);
 375         add_dyn_dbg("debug_pwork_fast", B43legacy_DBG_PWORK_FAST, 0);
 376         add_dyn_dbg("debug_pwork_stop", B43legacy_DBG_PWORK_STOP, 0);
 377
 378 #undef add_dyn_dbg
 379 }
 380
 381 void b43legacy_debugfs_add_device(struct b43legacy_wldev *dev)
 382 {
 383         struct b43legacy_dfsentry *e;
 384         struct b43legacy_txstatus_log *log;
 385         char devdir[16];
 386
 387         B43legacy_WARN_ON(!dev);
 388         e = kzalloc(sizeof(*e), GFP_KERNEL);
 389         if (!e) {
 390                 b43legacyerr(dev->wl, "debugfs: add device OOM\n");
 391                 return;
 392         }
 393         e->dev = dev;
 394         log = &e->txstatlog;
 395         log->log = kcalloc(B43legacy_NR_LOGGED_TXSTATUS,
 396                            sizeof(struct b43legacy_txstatus), GFP_KERNEL);
 397         if (!log->log) {
 398                 b43legacyerr(dev->wl, "debugfs: add device txstatus OOM\n");
 399                 kfree(e);
 400                 return;
 401         }
 402         log->end = -1;
 403         spin_lock_init(&log->lock);
 404
 405         dev->dfsentry = e;
 406
 407         snprintf(devdir, sizeof(devdir), "%s", wiphy_name(dev->wl->hw->wiphy));
 408         e->subdir = debugfs_create_dir(devdir, rootdir);
 409         if (!e->subdir || IS_ERR(e->subdir)) {
 410                 if (e->subdir == ERR_PTR(-ENODEV)) {
 411                         b43legacydbg(dev->wl, "DebugFS (CONFIG_DEBUG_FS) not "
 412                                "enabled in kernel config\n");
 413                 } else {
 414                         b43legacyerr(dev->wl, "debugfs: cannot create %s directory\n",
 415                                devdir);
 416                 }
 417                 dev->dfsentry = NULL;
 418                 kfree(log->log);
 419                 kfree(e);
 420                 return;
 421         }
 422
 423 #define ADD_FILE(name, mode)    \
 424         do {                                                    \
 425                 struct dentry *d;                               \
 426                 d = debugfs_create_file(__stringify(name),      \
 427                                         mode, e->subdir, dev,   \
 428                                         &fops_##name.fops);     \
 429                 e->file_##name.dentry = NULL;                   \
 430                 if (!IS_ERR(d))                                 \
 431                         e->file_##name.dentry = d;              \
 432         } while (0)
 433
 434
 435         ADD_FILE(tsf, 0600);
 436         ADD_FILE(ucode_regs, 0400);
 437         ADD_FILE(shm, 0400);
 438         ADD_FILE(txstat, 0400);
 439         ADD_FILE(restart, 0200);
 440
 441 #undef ADD_FILE
 442
 443         b43legacy_add_dynamic_debug(dev);
 444 }
 445
 446 void b43legacy_debugfs_remove_device(struct b43legacy_wldev *dev)
 447 {
 448         struct b43legacy_dfsentry *e;
 449
 450         if (!dev)
 451                 return;
 452         e = dev->dfsentry;
 453         if (!e)
 454                 return;
 455         b43legacy_remove_dynamic_debug(dev);
 456
 457         debugfs_remove(e->file_tsf.dentry);
 458         debugfs_remove(e->file_ucode_regs.dentry);
 459         debugfs_remove(e->file_shm.dentry);
 460         debugfs_remove(e->file_txstat.dentry);
 461         debugfs_remove(e->file_restart.dentry);
 462
 463         debugfs_remove(e->subdir);
 464         kfree(e->txstatlog.log);
 465         kfree(e);
 466 }
 467
 468 void b43legacy_debugfs_log_txstat(struct b43legacy_wldev *dev,
 469                             const struct b43legacy_txstatus *status)
 470 {
 471         struct b43legacy_dfsentry *e = dev->dfsentry;
 472         struct b43legacy_txstatus_log *log;
 473         struct b43legacy_txstatus *cur;
 474         int i;
 475
 476         if (!e)
 477                 return;
 478         log = &e->txstatlog;
 479         B43legacy_WARN_ON(!irqs_disabled());
 480         spin_lock(&log->lock);
 481         i = log->end + 1;
 482         if (i == B43legacy_NR_LOGGED_TXSTATUS)
 483                 i = 0;
 484         log->end = i;
 485         cur = &(log->log[i]);
 486         memcpy(cur, status, sizeof(*cur));
 487         spin_unlock(&log->lock);
 488 }
 489
 490 void b43legacy_debugfs_init(void)
 491 {
 492         rootdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
 493         if (IS_ERR(rootdir))
 494                 rootdir = NULL;
 495 }
 496
 497 void b43legacy_debugfs_exit(void)
 498 {
 499         debugfs_remove(rootdir);
 500 }