1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 4 Broadcom B43legacy wireless driver 5 6 debugfs driver debugging code 7 8 Copyright (c) 2005-2007 Michael Buesch <m@bues.ch> 9 10 11*/ 12 13#include <linux/fs.h> 14#include <linux/debugfs.h> 15#include <linux/slab.h> 16#include <linux/netdevice.h> 17#include <linux/pci.h> 18#include <linux/mutex.h> 19 20#include "b43legacy.h" 21#include "main.h" 22#include "debugfs.h" 23#include "dma.h" 24#include "pio.h" 25#include "xmit.h" 26 27 28/* The root directory. */ 29static struct dentry *rootdir; 30 31struct b43legacy_debugfs_fops { 32 ssize_t (*read)(struct b43legacy_wldev *dev, char *buf, size_t bufsize); 33 int (*write)(struct b43legacy_wldev *dev, const char *buf, size_t count); 34 struct file_operations fops; 35 /* Offset of struct b43legacy_dfs_file in struct b43legacy_dfsentry */ 36 size_t file_struct_offset; 37 /* Take wl->irq_lock before calling read/write? */ 38 bool take_irqlock; 39}; 40 41static inline 42struct b43legacy_dfs_file * fops_to_dfs_file(struct b43legacy_wldev *dev, 43 const struct b43legacy_debugfs_fops *dfops) 44{ 45 void *p; 46 47 p = dev->dfsentry; 48 p += dfops->file_struct_offset; 49 50 return p; 51} 52 53 54#define fappend(fmt, x...) \ 55 do { \ 56 if (bufsize - count) \ 57 count += scnprintf(buf + count, \ 58 bufsize - count, \ 59 fmt , ##x); \ 60 else \ 61 printk(KERN_ERR "b43legacy: fappend overflow\n"); \ 62 } while (0) 63 64 65/* wl->irq_lock is locked */ 66static ssize_t tsf_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize) 67{ 68 ssize_t count = 0; 69 u64 tsf; 70 71 b43legacy_tsf_read(dev, &tsf); 72 fappend("0x%08x%08x\n", 73 (unsigned int)((tsf & 0xFFFFFFFF00000000ULL) >> 32), 74 (unsigned int)(tsf & 0xFFFFFFFFULL)); 75 76 return count; 77} 78 79/* wl->irq_lock is locked */ 80static int tsf_write_file(struct b43legacy_wldev *dev, const char *buf, size_t count) 81{ 82 u64 tsf; 83 84 if (sscanf(buf, "%llu", (unsigned long long *)(&tsf)) != 1) 85 return -EINVAL; 86 b43legacy_tsf_write(dev, tsf); 87 88 return 0; 89} 90 91/* wl->irq_lock is locked */ 92static ssize_t ucode_regs_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize) 93{ 94 ssize_t count = 0; 95 int i; 96 97 for (i = 0; i < 64; i++) { 98 fappend("r%d = 0x%04x\n", i, 99 b43legacy_shm_read16(dev, B43legacy_SHM_WIRELESS, i)); 100 } 101 102 return count; 103} 104 105/* wl->irq_lock is locked */ 106static ssize_t shm_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize) 107{ 108 ssize_t count = 0; 109 int i; 110 u16 tmp; 111 __le16 *le16buf = (__le16 *)buf; 112 113 for (i = 0; i < 0x1000; i++) { 114 if (bufsize < sizeof(tmp)) 115 break; 116 tmp = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED, 2 * i); 117 le16buf[i] = cpu_to_le16(tmp); 118 count += sizeof(tmp); 119 bufsize -= sizeof(tmp); 120 } 121 122 return count; 123} 124 125static ssize_t txstat_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize) 126{ 127 struct b43legacy_txstatus_log *log = &dev->dfsentry->txstatlog; 128 ssize_t count = 0; 129 unsigned long flags; 130 int i, idx; 131 struct b43legacy_txstatus *stat; 132 133 spin_lock_irqsave(&log->lock, flags); 134 if (log->end < 0) { 135 fappend("Nothing transmitted, yet\n"); 136 goto out_unlock; 137 } 138 fappend("b43legacy TX status reports:\n\n" 139 "index | cookie | seq | phy_stat | frame_count | " 140 "rts_count | supp_reason | pm_indicated | " 141 "intermediate | for_ampdu | acked\n" "---\n"); 142 i = log->end + 1; 143 idx = 0; 144 while (1) { 145 if (i == B43legacy_NR_LOGGED_TXSTATUS) 146 i = 0; 147 stat = &(log->log[i]); 148 if (stat->cookie) { 149 fappend("%03d | " 150 "0x%04X | 0x%04X | 0x%02X | " 151 "0x%X | 0x%X | " 152 "%u | %u | " 153 "%u | %u | %u\n", 154 idx, 155 stat->cookie, stat->seq, stat->phy_stat, 156 stat->frame_count, stat->rts_count, 157 stat->supp_reason, stat->pm_indicated, 158 stat->intermediate, stat->for_ampdu, 159 stat->acked); 160 idx++; 161 } 162 if (i == log->end) 163 break; 164 i++; 165 } 166out_unlock: 167 spin_unlock_irqrestore(&log->lock, flags); 168 169 return count; 170} 171 172/* wl->irq_lock is locked */ 173static int restart_write_file(struct b43legacy_wldev *dev, const char *buf, size_t count) 174{ 175 int err = 0; 176 177 if (count > 0 && buf[0] == '1') { 178 b43legacy_controller_restart(dev, "manually restarted"); 179 } else 180 err = -EINVAL; 181 182 return err; 183} 184 185#undef fappend 186 187static ssize_t b43legacy_debugfs_read(struct file *file, char __user *userbuf, 188 size_t count, loff_t *ppos) 189{ 190 struct b43legacy_wldev *dev; 191 struct b43legacy_debugfs_fops *dfops; 192 struct b43legacy_dfs_file *dfile; 193 ssize_t ret; 194 char *buf; 195 const size_t bufsize = 1024 * 16; /* 16 KiB buffer */ 196 const size_t buforder = get_order(bufsize); 197 int err = 0; 198 199 if (!count) 200 return 0; 201 dev = file->private_data; 202 if (!dev) 203 return -ENODEV; 204 205 mutex_lock(&dev->wl->mutex); 206 if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED) { 207 err = -ENODEV; 208 goto out_unlock; 209 } 210 211 dfops = container_of(debugfs_real_fops(file), 212 struct b43legacy_debugfs_fops, fops); 213 if (!dfops->read) { 214 err = -ENOSYS; 215 goto out_unlock; 216 } 217 dfile = fops_to_dfs_file(dev, dfops); 218 219 if (!dfile->buffer) { 220 buf = (char *)__get_free_pages(GFP_KERNEL, buforder); 221 if (!buf) { 222 err = -ENOMEM; 223 goto out_unlock; 224 } 225 memset(buf, 0, bufsize); 226 if (dfops->take_irqlock) { 227 spin_lock_irq(&dev->wl->irq_lock); 228 ret = dfops->read(dev, buf, bufsize); 229 spin_unlock_irq(&dev->wl->irq_lock); 230 } else 231 ret = dfops->read(dev, buf, bufsize); 232 if (ret <= 0) { 233 free_pages((unsigned long)buf, buforder); 234 err = ret; 235 goto out_unlock; 236 } 237 dfile->data_len = ret; 238 dfile->buffer = buf; 239 } 240 241 ret = simple_read_from_buffer(userbuf, count, ppos, 242 dfile->buffer, 243 dfile->data_len); 244 if (*ppos >= dfile->data_len) { 245 free_pages((unsigned long)dfile->buffer, buforder); 246 dfile->buffer = NULL; 247 dfile->data_len = 0; 248 } 249out_unlock: 250 mutex_unlock(&dev->wl->mutex); 251 252 return err ? err : ret; 253} 254 255static ssize_t b43legacy_debugfs_write(struct file *file, 256 const char __user *userbuf, 257 size_t count, loff_t *ppos) 258{ 259 struct b43legacy_wldev *dev; 260 struct b43legacy_debugfs_fops *dfops; 261 char *buf; 262 int err = 0; 263 264 if (!count) 265 return 0; 266 if (count > PAGE_SIZE) 267 return -E2BIG; 268 dev = file->private_data; 269 if (!dev) 270 return -ENODEV; 271 272 mutex_lock(&dev->wl->mutex); 273 if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED) { 274 err = -ENODEV; 275 goto out_unlock; 276 } 277 278 dfops = container_of(debugfs_real_fops(file), 279 struct b43legacy_debugfs_fops, fops); 280 if (!dfops->write) { 281 err = -ENOSYS; 282 goto out_unlock; 283 } 284 285 buf = (char *)get_zeroed_page(GFP_KERNEL); 286 if (!buf) { 287 err = -ENOMEM; 288 goto out_unlock; 289 } 290 if (copy_from_user(buf, userbuf, count)) { 291 err = -EFAULT; 292 goto out_freepage; 293 } 294 if (dfops->take_irqlock) { 295 spin_lock_irq(&dev->wl->irq_lock); 296 err = dfops->write(dev, buf, count); 297 spin_unlock_irq(&dev->wl->irq_lock); 298 } else 299 err = dfops->write(dev, buf, count); 300 if (err) 301 goto out_freepage; 302 303out_freepage: 304 free_page((unsigned long)buf); 305out_unlock: 306 mutex_unlock(&dev->wl->mutex); 307 308 return err ? err : count; 309} 310 311 312#define B43legacy_DEBUGFS_FOPS(name, _read, _write, _take_irqlock) \ 313 static struct b43legacy_debugfs_fops fops_##name = { \ 314 .read = _read, \ 315 .write = _write, \ 316 .fops = { \ 317 .open = simple_open, \ 318 .read = b43legacy_debugfs_read, \ 319 .write = b43legacy_debugfs_write, \ 320 .llseek = generic_file_llseek, \ 321 }, \ 322 .file_struct_offset = offsetof(struct b43legacy_dfsentry, \ 323 file_##name), \ 324 .take_irqlock = _take_irqlock, \ 325 } 326 327B43legacy_DEBUGFS_FOPS(tsf, tsf_read_file, tsf_write_file, 1); 328B43legacy_DEBUGFS_FOPS(ucode_regs, ucode_regs_read_file, NULL, 1); 329B43legacy_DEBUGFS_FOPS(shm, shm_read_file, NULL, 1); 330B43legacy_DEBUGFS_FOPS(txstat, txstat_read_file, NULL, 0); 331B43legacy_DEBUGFS_FOPS(restart, NULL, restart_write_file, 1); 332 333 334int b43legacy_debug(struct b43legacy_wldev *dev, enum b43legacy_dyndbg feature) 335{ 336 return !!(dev->dfsentry && dev->dfsentry->dyn_debug[feature]); 337} 338 339static void b43legacy_add_dynamic_debug(struct b43legacy_wldev *dev) 340{ 341 struct b43legacy_dfsentry *e = dev->dfsentry; 342 343#define add_dyn_dbg(name, id, initstate) do { \ 344 e->dyn_debug[id] = (initstate); \ 345 debugfs_create_bool(name, 0600, e->subdir, \ 346 &(e->dyn_debug[id])); \ 347 } while (0) 348 349 add_dyn_dbg("debug_xmitpower", B43legacy_DBG_XMITPOWER, false); 350 add_dyn_dbg("debug_dmaoverflow", B43legacy_DBG_DMAOVERFLOW, false); 351 add_dyn_dbg("debug_dmaverbose", B43legacy_DBG_DMAVERBOSE, false); 352 add_dyn_dbg("debug_pwork_fast", B43legacy_DBG_PWORK_FAST, false); 353 add_dyn_dbg("debug_pwork_stop", B43legacy_DBG_PWORK_STOP, false); 354 355#undef add_dyn_dbg 356} 357 358void b43legacy_debugfs_add_device(struct b43legacy_wldev *dev) 359{ 360 struct b43legacy_dfsentry *e; 361 struct b43legacy_txstatus_log *log; 362 char devdir[16]; 363 364 B43legacy_WARN_ON(!dev); 365 e = kzalloc(sizeof(*e), GFP_KERNEL); 366 if (!e) { 367 b43legacyerr(dev->wl, "debugfs: add device OOM\n"); 368 return; 369 } 370 e->dev = dev; 371 log = &e->txstatlog; 372 log->log = kcalloc(B43legacy_NR_LOGGED_TXSTATUS, 373 sizeof(struct b43legacy_txstatus), GFP_KERNEL); 374 if (!log->log) { 375 b43legacyerr(dev->wl, "debugfs: add device txstatus OOM\n"); 376 kfree(e); 377 return; 378 } 379 log->end = -1; 380 spin_lock_init(&log->lock); 381 382 dev->dfsentry = e; 383 384 snprintf(devdir, sizeof(devdir), "%s", wiphy_name(dev->wl->hw->wiphy)); 385 e->subdir = debugfs_create_dir(devdir, rootdir); 386 387#define ADD_FILE(name, mode) \ 388 do { \ 389 debugfs_create_file(__stringify(name), mode, \ 390 e->subdir, dev, \ 391 &fops_##name.fops); \ 392 } while (0) 393 394 395 ADD_FILE(tsf, 0600); 396 ADD_FILE(ucode_regs, 0400); 397 ADD_FILE(shm, 0400); 398 ADD_FILE(txstat, 0400); 399 ADD_FILE(restart, 0200); 400 401#undef ADD_FILE 402 403 b43legacy_add_dynamic_debug(dev); 404} 405 406void b43legacy_debugfs_remove_device(struct b43legacy_wldev *dev) 407{ 408 struct b43legacy_dfsentry *e; 409 410 if (!dev) 411 return; 412 e = dev->dfsentry; 413 if (!e) 414 return; 415 416 debugfs_remove(e->subdir); 417 kfree(e->txstatlog.log); 418 kfree(e); 419} 420 421void b43legacy_debugfs_log_txstat(struct b43legacy_wldev *dev, 422 const struct b43legacy_txstatus *status) 423{ 424 struct b43legacy_dfsentry *e = dev->dfsentry; 425 struct b43legacy_txstatus_log *log; 426 struct b43legacy_txstatus *cur; 427 int i; 428 429 if (!e) 430 return; 431 log = &e->txstatlog; 432 B43legacy_WARN_ON(!irqs_disabled()); 433 spin_lock(&log->lock); 434 i = log->end + 1; 435 if (i == B43legacy_NR_LOGGED_TXSTATUS) 436 i = 0; 437 log->end = i; 438 cur = &(log->log[i]); 439 memcpy(cur, status, sizeof(*cur)); 440 spin_unlock(&log->lock); 441} 442 443void b43legacy_debugfs_init(void) 444{ 445 rootdir = debugfs_create_dir(KBUILD_MODNAME, NULL); 446} 447 448void b43legacy_debugfs_exit(void) 449{ 450 debugfs_remove(rootdir); 451} 452