Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/iwlwifi/fw/debugfs.c
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1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause 2 /* 3 * Copyright (C) 2012-2014, 2018-2020 Intel Corporation 4 * Copyright (C) 2013-2015 Intel Mobile Communications GmbH 5 * Copyright (C) 2016-2017 Intel Deutschland GmbH 6 */ 7 #include "api/commands.h" 8 #include "debugfs.h" 9 #include "dbg.h" 10 #include <linux/seq_file.h> 11 12 #define FWRT_DEBUGFS_OPEN_WRAPPER(name, buflen, argtype) \ 13 struct dbgfs_##name##_data { \ 14 argtype *arg; \ 15 bool read_done; \ 16 ssize_t rlen; \ 17 char rbuf[buflen]; \ 18 }; \ 19 static int _iwl_dbgfs_##name##_open(struct inode *inode, \ 20 struct file *file) \ 21 { \ 22 struct dbgfs_##name##_data *data; \ 23 \ 24 data = kzalloc(sizeof(*data), GFP_KERNEL); \ 25 if (!data) \ 26 return -ENOMEM; \ 27 \ 28 data->read_done = false; \ 29 data->arg = inode->i_private; \ 30 file->private_data = data; \ 31 \ 32 return 0; \ 33 } 34 35 #define FWRT_DEBUGFS_READ_WRAPPER(name) \ 36 static ssize_t _iwl_dbgfs_##name##_read(struct file *file, \ 37 char __user *user_buf, \ 38 size_t count, loff_t *ppos) \ 39 { \ 40 struct dbgfs_##name##_data *data = file->private_data; \ 41 \ 42 if (!data->read_done) { \ 43 data->read_done = true; \ 44 data->rlen = iwl_dbgfs_##name##_read(data->arg, \ 45 sizeof(data->rbuf),\ 46 data->rbuf); \ 47 } \ 48 \ 49 if (data->rlen < 0) \ 50 return data->rlen; \ 51 return simple_read_from_buffer(user_buf, count, ppos, \ 52 data->rbuf, data->rlen); \ 53 } 54 55 static int _iwl_dbgfs_release(struct inode *inode, struct file *file) 56 { 57 kfree(file->private_data); 58 59 return 0; 60 } 61 62 #define _FWRT_DEBUGFS_READ_FILE_OPS(name, buflen, argtype) \ 63 FWRT_DEBUGFS_OPEN_WRAPPER(name, buflen, argtype) \ 64 FWRT_DEBUGFS_READ_WRAPPER(name) \ 65 static const struct file_operations iwl_dbgfs_##name##_ops = { \ 66 .read = _iwl_dbgfs_##name##_read, \ 67 .open = _iwl_dbgfs_##name##_open, \ 68 .llseek = generic_file_llseek, \ 69 .release = _iwl_dbgfs_release, \ 70 } 71 72 #define FWRT_DEBUGFS_WRITE_WRAPPER(name, buflen, argtype) \ 73 static ssize_t _iwl_dbgfs_##name##_write(struct file *file, \ 74 const char __user *user_buf, \ 75 size_t count, loff_t *ppos) \ 76 { \ 77 argtype *arg = \ 78 ((struct dbgfs_##name##_data *)file->private_data)->arg;\ 79 char buf[buflen] = {}; \ 80 size_t buf_size = min(count, sizeof(buf) - 1); \ 81 \ 82 if (copy_from_user(buf, user_buf, buf_size)) \ 83 return -EFAULT; \ 84 \ 85 return iwl_dbgfs_##name##_write(arg, buf, buf_size); \ 86 } 87 88 #define _FWRT_DEBUGFS_READ_WRITE_FILE_OPS(name, buflen, argtype) \ 89 FWRT_DEBUGFS_OPEN_WRAPPER(name, buflen, argtype) \ 90 FWRT_DEBUGFS_WRITE_WRAPPER(name, buflen, argtype) \ 91 FWRT_DEBUGFS_READ_WRAPPER(name) \ 92 static const struct file_operations iwl_dbgfs_##name##_ops = { \ 93 .write = _iwl_dbgfs_##name##_write, \ 94 .read = _iwl_dbgfs_##name##_read, \ 95 .open = _iwl_dbgfs_##name##_open, \ 96 .llseek = generic_file_llseek, \ 97 .release = _iwl_dbgfs_release, \ 98 } 99 100 #define _FWRT_DEBUGFS_WRITE_FILE_OPS(name, buflen, argtype) \ 101 FWRT_DEBUGFS_OPEN_WRAPPER(name, buflen, argtype) \ 102 FWRT_DEBUGFS_WRITE_WRAPPER(name, buflen, argtype) \ 103 static const struct file_operations iwl_dbgfs_##name##_ops = { \ 104 .write = _iwl_dbgfs_##name##_write, \ 105 .open = _iwl_dbgfs_##name##_open, \ 106 .llseek = generic_file_llseek, \ 107 .release = _iwl_dbgfs_release, \ 108 } 109 110 #define FWRT_DEBUGFS_READ_FILE_OPS(name, bufsz) \ 111 _FWRT_DEBUGFS_READ_FILE_OPS(name, bufsz, struct iwl_fw_runtime) 112 113 #define FWRT_DEBUGFS_WRITE_FILE_OPS(name, bufsz) \ 114 _FWRT_DEBUGFS_WRITE_FILE_OPS(name, bufsz, struct iwl_fw_runtime) 115 116 #define FWRT_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 117 _FWRT_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_fw_runtime) 118 119 #define FWRT_DEBUGFS_ADD_FILE_ALIAS(alias, name, parent, mode) do { \ 120 debugfs_create_file(alias, mode, parent, fwrt, \ 121 &iwl_dbgfs_##name##_ops); \ 122 } while (0) 123 #define FWRT_DEBUGFS_ADD_FILE(name, parent, mode) \ 124 FWRT_DEBUGFS_ADD_FILE_ALIAS(#name, name, parent, mode) 125 126 static int iwl_fw_send_timestamp_marker_cmd(struct iwl_fw_runtime *fwrt) 127 { 128 struct iwl_mvm_marker marker = { 129 .dw_len = sizeof(struct iwl_mvm_marker) / 4, 130 .marker_id = MARKER_ID_SYNC_CLOCK, 131 132 /* the real timestamp is taken from the ftrace clock 133 * this is for finding the match between fw and kernel logs 134 */ 135 .timestamp = cpu_to_le64(fwrt->timestamp.seq++), 136 }; 137 138 struct iwl_host_cmd hcmd = { 139 .id = MARKER_CMD, 140 .flags = CMD_ASYNC, 141 .data[0] = &marker, 142 .len[0] = sizeof(marker), 143 }; 144 145 return iwl_trans_send_cmd(fwrt->trans, &hcmd); 146 } 147 148 static int iwl_dbgfs_enabled_severities_write(struct iwl_fw_runtime *fwrt, 149 char *buf, size_t count) 150 { 151 struct iwl_dbg_host_event_cfg_cmd event_cfg; 152 struct iwl_host_cmd hcmd = { 153 .id = WIDE_ID(DEBUG_GROUP, HOST_EVENT_CFG), 154 .flags = CMD_ASYNC, 155 .data[0] = &event_cfg, 156 .len[0] = sizeof(event_cfg), 157 }; 158 u32 enabled_severities; 159 int ret = kstrtou32(buf, 10, &enabled_severities); 160 161 if (ret < 0) 162 return ret; 163 164 event_cfg.enabled_severities = cpu_to_le32(enabled_severities); 165 166 ret = iwl_trans_send_cmd(fwrt->trans, &hcmd); 167 IWL_INFO(fwrt, 168 "sent host event cfg with enabled_severities: %u, ret: %d\n", 169 enabled_severities, ret); 170 171 return ret ?: count; 172 } 173 174 FWRT_DEBUGFS_WRITE_FILE_OPS(enabled_severities, 16); 175 176 static void iwl_fw_timestamp_marker_wk(struct work_struct *work) 177 { 178 int ret; 179 struct iwl_fw_runtime *fwrt = 180 container_of(work, struct iwl_fw_runtime, timestamp.wk.work); 181 unsigned long delay = fwrt->timestamp.delay; 182 183 ret = iwl_fw_send_timestamp_marker_cmd(fwrt); 184 if (!ret && delay) 185 schedule_delayed_work(&fwrt->timestamp.wk, 186 round_jiffies_relative(delay)); 187 else 188 IWL_INFO(fwrt, 189 "stopping timestamp_marker, ret: %d, delay: %u\n", 190 ret, jiffies_to_msecs(delay) / 1000); 191 } 192 193 void iwl_fw_trigger_timestamp(struct iwl_fw_runtime *fwrt, u32 delay) 194 { 195 IWL_INFO(fwrt, 196 "starting timestamp_marker trigger with delay: %us\n", 197 delay); 198 199 iwl_fw_cancel_timestamp(fwrt); 200 201 fwrt->timestamp.delay = msecs_to_jiffies(delay * 1000); 202 203 schedule_delayed_work(&fwrt->timestamp.wk, 204 round_jiffies_relative(fwrt->timestamp.delay)); 205 } 206 207 static ssize_t iwl_dbgfs_timestamp_marker_write(struct iwl_fw_runtime *fwrt, 208 char *buf, size_t count) 209 { 210 int ret; 211 u32 delay; 212 213 ret = kstrtou32(buf, 10, &delay); 214 if (ret < 0) 215 return ret; 216 217 iwl_fw_trigger_timestamp(fwrt, delay); 218 219 return count; 220 } 221 222 static ssize_t iwl_dbgfs_timestamp_marker_read(struct iwl_fw_runtime *fwrt, 223 size_t size, char *buf) 224 { 225 u32 delay_secs = jiffies_to_msecs(fwrt->timestamp.delay) / 1000; 226 227 return scnprintf(buf, size, "%d\n", delay_secs); 228 } 229 230 FWRT_DEBUGFS_READ_WRITE_FILE_OPS(timestamp_marker, 16); 231 232 struct hcmd_write_data { 233 __be32 cmd_id; 234 __be32 flags; 235 __be16 length; 236 u8 data[]; 237 } __packed; 238 239 static ssize_t iwl_dbgfs_send_hcmd_write(struct iwl_fw_runtime *fwrt, char *buf, 240 size_t count) 241 { 242 size_t header_size = (sizeof(u32) * 2 + sizeof(u16)) * 2; 243 size_t data_size = (count - 1) / 2; 244 int ret; 245 struct hcmd_write_data *data; 246 struct iwl_host_cmd hcmd = { 247 .len = { 0, }, 248 .data = { NULL, }, 249 }; 250 251 if (fwrt->ops && fwrt->ops->fw_running && 252 !fwrt->ops->fw_running(fwrt->ops_ctx)) 253 return -EIO; 254 255 if (count < header_size + 1 || count > 1024 * 4) 256 return -EINVAL; 257 258 data = kmalloc(data_size, GFP_KERNEL); 259 if (!data) 260 return -ENOMEM; 261 262 ret = hex2bin((u8 *)data, buf, data_size); 263 if (ret) 264 goto out; 265 266 hcmd.id = be32_to_cpu(data->cmd_id); 267 hcmd.flags = be32_to_cpu(data->flags); 268 hcmd.len[0] = be16_to_cpu(data->length); 269 hcmd.data[0] = data->data; 270 271 if (count != header_size + hcmd.len[0] * 2 + 1) { 272 IWL_ERR(fwrt, 273 "host command data size does not match header length\n"); 274 ret = -EINVAL; 275 goto out; 276 } 277 278 if (fwrt->ops && fwrt->ops->send_hcmd) 279 ret = fwrt->ops->send_hcmd(fwrt->ops_ctx, &hcmd); 280 else 281 ret = -EPERM; 282 283 if (ret < 0) 284 goto out; 285 286 if (hcmd.flags & CMD_WANT_SKB) 287 iwl_free_resp(&hcmd); 288 out: 289 kfree(data); 290 return ret ?: count; 291 } 292 293 FWRT_DEBUGFS_WRITE_FILE_OPS(send_hcmd, 512); 294 295 static ssize_t iwl_dbgfs_fw_dbg_domain_read(struct iwl_fw_runtime *fwrt, 296 size_t size, char *buf) 297 { 298 return scnprintf(buf, size, "0x%08x\n", 299 fwrt->trans->dbg.domains_bitmap); 300 } 301 302 FWRT_DEBUGFS_READ_FILE_OPS(fw_dbg_domain, 20); 303 304 struct iwl_dbgfs_fw_info_priv { 305 struct iwl_fw_runtime *fwrt; 306 }; 307 308 struct iwl_dbgfs_fw_info_state { 309 loff_t pos; 310 }; 311 312 static void *iwl_dbgfs_fw_info_seq_next(struct seq_file *seq, 313 void *v, loff_t *pos) 314 { 315 struct iwl_dbgfs_fw_info_state *state = v; 316 struct iwl_dbgfs_fw_info_priv *priv = seq->private; 317 const struct iwl_fw *fw = priv->fwrt->fw; 318 319 *pos = ++state->pos; 320 if (*pos >= fw->ucode_capa.n_cmd_versions) 321 return NULL; 322 323 return state; 324 } 325 326 static void iwl_dbgfs_fw_info_seq_stop(struct seq_file *seq, 327 void *v) 328 { 329 kfree(v); 330 } 331 332 static void *iwl_dbgfs_fw_info_seq_start(struct seq_file *seq, loff_t *pos) 333 { 334 struct iwl_dbgfs_fw_info_priv *priv = seq->private; 335 const struct iwl_fw *fw = priv->fwrt->fw; 336 struct iwl_dbgfs_fw_info_state *state; 337 338 if (*pos >= fw->ucode_capa.n_cmd_versions) 339 return NULL; 340 341 state = kzalloc(sizeof(*state), GFP_KERNEL); 342 if (!state) 343 return NULL; 344 state->pos = *pos; 345 return state; 346 }; 347 348 static int iwl_dbgfs_fw_info_seq_show(struct seq_file *seq, void *v) 349 { 350 struct iwl_dbgfs_fw_info_state *state = v; 351 struct iwl_dbgfs_fw_info_priv *priv = seq->private; 352 const struct iwl_fw *fw = priv->fwrt->fw; 353 const struct iwl_fw_cmd_version *ver; 354 u32 cmd_id; 355 356 if (!state->pos) 357 seq_puts(seq, "fw_api_ver:\n"); 358 359 ver = &fw->ucode_capa.cmd_versions[state->pos]; 360 361 cmd_id = WIDE_ID(ver->group, ver->cmd); 362 363 seq_printf(seq, " 0x%04x:\n", cmd_id); 364 seq_printf(seq, " name: %s\n", 365 iwl_get_cmd_string(priv->fwrt->trans, cmd_id)); 366 seq_printf(seq, " cmd_ver: %d\n", ver->cmd_ver); 367 seq_printf(seq, " notif_ver: %d\n", ver->notif_ver); 368 return 0; 369 } 370 371 static const struct seq_operations iwl_dbgfs_info_seq_ops = { 372 .start = iwl_dbgfs_fw_info_seq_start, 373 .next = iwl_dbgfs_fw_info_seq_next, 374 .stop = iwl_dbgfs_fw_info_seq_stop, 375 .show = iwl_dbgfs_fw_info_seq_show, 376 }; 377 378 static int iwl_dbgfs_fw_info_open(struct inode *inode, struct file *filp) 379 { 380 struct iwl_dbgfs_fw_info_priv *priv; 381 382 priv = __seq_open_private(filp, &iwl_dbgfs_info_seq_ops, 383 sizeof(*priv)); 384 385 if (!priv) 386 return -ENOMEM; 387 388 priv->fwrt = inode->i_private; 389 return 0; 390 } 391 392 static const struct file_operations iwl_dbgfs_fw_info_ops = { 393 .owner = THIS_MODULE, 394 .open = iwl_dbgfs_fw_info_open, 395 .read = seq_read, 396 .llseek = seq_lseek, 397 .release = seq_release_private, 398 }; 399 400 void iwl_fwrt_dbgfs_register(struct iwl_fw_runtime *fwrt, 401 struct dentry *dbgfs_dir) 402 { 403 INIT_DELAYED_WORK(&fwrt->timestamp.wk, iwl_fw_timestamp_marker_wk); 404 FWRT_DEBUGFS_ADD_FILE(timestamp_marker, dbgfs_dir, 0200); 405 FWRT_DEBUGFS_ADD_FILE(fw_info, dbgfs_dir, 0200); 406 FWRT_DEBUGFS_ADD_FILE(send_hcmd, dbgfs_dir, 0200); 407 FWRT_DEBUGFS_ADD_FILE(enabled_severities, dbgfs_dir, 0200); 408 FWRT_DEBUGFS_ADD_FILE(fw_dbg_domain, dbgfs_dir, 0400); 409 }
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