Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2012 Cisco Systems, Inc. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you may redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; version 2 of the License. |
| 7 | * |
| 8 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 9 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 10 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 11 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 12 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 13 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 14 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 15 | * SOFTWARE. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/errno.h> |
| 20 | #include <linux/debugfs.h> |
| 21 | #include "fnic.h" |
| 22 | |
| 23 | static struct dentry *fnic_trace_debugfs_root; |
| 24 | static struct dentry *fnic_trace_debugfs_file; |
| 25 | static struct dentry *fnic_trace_enable; |
Hiral Patel | 67125b0 | 2013-09-12 17:45:42 -0700 | [diff] [blame] | 26 | static struct dentry *fnic_stats_debugfs_root; |
| 27 | |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 28 | static struct dentry *fnic_fc_trace_debugfs_file; |
| 29 | static struct dentry *fnic_fc_rdata_trace_debugfs_file; |
| 30 | static struct dentry *fnic_fc_trace_enable; |
| 31 | static struct dentry *fnic_fc_trace_clear; |
| 32 | |
| 33 | struct fc_trace_flag_type { |
| 34 | u8 fc_row_file; |
| 35 | u8 fc_normal_file; |
| 36 | u8 fnic_trace; |
| 37 | u8 fc_trace; |
| 38 | u8 fc_clear; |
| 39 | }; |
| 40 | |
| 41 | static struct fc_trace_flag_type *fc_trc_flag; |
| 42 | |
Hiral Patel | 67125b0 | 2013-09-12 17:45:42 -0700 | [diff] [blame] | 43 | /* |
| 44 | * fnic_debugfs_init - Initialize debugfs for fnic debug logging |
| 45 | * |
| 46 | * Description: |
| 47 | * When Debugfs is configured this routine sets up the fnic debugfs |
| 48 | * file system. If not already created, this routine will create the |
| 49 | * fnic directory and statistics directory for trace buffer and |
| 50 | * stats logging. |
| 51 | */ |
| 52 | int fnic_debugfs_init(void) |
| 53 | { |
| 54 | int rc = -1; |
| 55 | fnic_trace_debugfs_root = debugfs_create_dir("fnic", NULL); |
| 56 | if (!fnic_trace_debugfs_root) { |
| 57 | printk(KERN_DEBUG "Cannot create debugfs root\n"); |
| 58 | return rc; |
| 59 | } |
| 60 | |
| 61 | if (!fnic_trace_debugfs_root) { |
| 62 | printk(KERN_DEBUG |
| 63 | "fnic root directory doesn't exist in debugfs\n"); |
| 64 | return rc; |
| 65 | } |
| 66 | |
| 67 | fnic_stats_debugfs_root = debugfs_create_dir("statistics", |
| 68 | fnic_trace_debugfs_root); |
| 69 | if (!fnic_stats_debugfs_root) { |
| 70 | printk(KERN_DEBUG "Cannot create Statistics directory\n"); |
| 71 | return rc; |
| 72 | } |
| 73 | |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 74 | /* Allocate memory to structure */ |
| 75 | fc_trc_flag = (struct fc_trace_flag_type *) |
| 76 | vmalloc(sizeof(struct fc_trace_flag_type)); |
| 77 | |
| 78 | if (fc_trc_flag) { |
| 79 | fc_trc_flag->fc_row_file = 0; |
| 80 | fc_trc_flag->fc_normal_file = 1; |
| 81 | fc_trc_flag->fnic_trace = 2; |
| 82 | fc_trc_flag->fc_trace = 3; |
| 83 | fc_trc_flag->fc_clear = 4; |
| 84 | } |
| 85 | |
Hiral Patel | 67125b0 | 2013-09-12 17:45:42 -0700 | [diff] [blame] | 86 | rc = 0; |
| 87 | return rc; |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * fnic_debugfs_terminate - Tear down debugfs infrastructure |
| 92 | * |
| 93 | * Description: |
| 94 | * When Debugfs is configured this routine removes debugfs file system |
| 95 | * elements that are specific to fnic. |
| 96 | */ |
| 97 | void fnic_debugfs_terminate(void) |
| 98 | { |
| 99 | debugfs_remove(fnic_stats_debugfs_root); |
| 100 | fnic_stats_debugfs_root = NULL; |
| 101 | |
| 102 | debugfs_remove(fnic_trace_debugfs_root); |
| 103 | fnic_trace_debugfs_root = NULL; |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 104 | |
| 105 | if (fc_trc_flag) |
| 106 | vfree(fc_trc_flag); |
Hiral Patel | 67125b0 | 2013-09-12 17:45:42 -0700 | [diff] [blame] | 107 | } |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 108 | |
| 109 | /* |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 110 | * fnic_trace_ctrl_open - Open the trace_enable file for fnic_trace |
| 111 | * Or Open fc_trace_enable file for fc_trace |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 112 | * @inode: The inode pointer. |
| 113 | * @file: The file pointer to attach the trace enable/disable flag. |
| 114 | * |
| 115 | * Description: |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 116 | * This routine opens a debugsfs file trace_enable or fc_trace_enable. |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 117 | * |
| 118 | * Returns: |
| 119 | * This function returns zero if successful. |
| 120 | */ |
| 121 | static int fnic_trace_ctrl_open(struct inode *inode, struct file *filp) |
| 122 | { |
| 123 | filp->private_data = inode->i_private; |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | /* |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 128 | * fnic_trace_ctrl_read - |
| 129 | * Read trace_enable ,fc_trace_enable |
| 130 | * or fc_trace_clear debugfs file |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 131 | * @filp: The file pointer to read from. |
| 132 | * @ubuf: The buffer to copy the data to. |
| 133 | * @cnt: The number of bytes to read. |
| 134 | * @ppos: The position in the file to start reading from. |
| 135 | * |
| 136 | * Description: |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 137 | * This routine reads value of variable fnic_tracing_enabled or |
| 138 | * fnic_fc_tracing_enabled or fnic_fc_trace_cleared |
| 139 | * and stores into local @buf. |
| 140 | * It will start reading file at @ppos and |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 141 | * copy up to @cnt of data to @ubuf from @buf. |
| 142 | * |
| 143 | * Returns: |
| 144 | * This function returns the amount of data that was read. |
| 145 | */ |
| 146 | static ssize_t fnic_trace_ctrl_read(struct file *filp, |
| 147 | char __user *ubuf, |
| 148 | size_t cnt, loff_t *ppos) |
| 149 | { |
| 150 | char buf[64]; |
| 151 | int len; |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 152 | u8 *trace_type; |
| 153 | len = 0; |
| 154 | trace_type = (u8 *)filp->private_data; |
| 155 | if (*trace_type == fc_trc_flag->fnic_trace) |
| 156 | len = sprintf(buf, "%u\n", fnic_tracing_enabled); |
| 157 | else if (*trace_type == fc_trc_flag->fc_trace) |
| 158 | len = sprintf(buf, "%u\n", fnic_fc_tracing_enabled); |
| 159 | else if (*trace_type == fc_trc_flag->fc_clear) |
| 160 | len = sprintf(buf, "%u\n", fnic_fc_trace_cleared); |
| 161 | else |
| 162 | pr_err("fnic: Cannot read to any debugfs file\n"); |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 163 | |
| 164 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
| 165 | } |
| 166 | |
| 167 | /* |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 168 | * fnic_trace_ctrl_write - |
| 169 | * Write to trace_enable, fc_trace_enable or |
| 170 | * fc_trace_clear debugfs file |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 171 | * @filp: The file pointer to write from. |
| 172 | * @ubuf: The buffer to copy the data from. |
| 173 | * @cnt: The number of bytes to write. |
| 174 | * @ppos: The position in the file to start writing to. |
| 175 | * |
| 176 | * Description: |
| 177 | * This routine writes data from user buffer @ubuf to buffer @buf and |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 178 | * sets fc_trace_enable ,tracing_enable or fnic_fc_trace_cleared |
| 179 | * value as per user input. |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 180 | * |
| 181 | * Returns: |
| 182 | * This function returns the amount of data that was written. |
| 183 | */ |
| 184 | static ssize_t fnic_trace_ctrl_write(struct file *filp, |
| 185 | const char __user *ubuf, |
| 186 | size_t cnt, loff_t *ppos) |
| 187 | { |
| 188 | char buf[64]; |
| 189 | unsigned long val; |
| 190 | int ret; |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 191 | u8 *trace_type; |
| 192 | trace_type = (u8 *)filp->private_data; |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 193 | |
| 194 | if (cnt >= sizeof(buf)) |
| 195 | return -EINVAL; |
| 196 | |
| 197 | if (copy_from_user(&buf, ubuf, cnt)) |
| 198 | return -EFAULT; |
| 199 | |
| 200 | buf[cnt] = 0; |
| 201 | |
| 202 | ret = kstrtoul(buf, 10, &val); |
| 203 | if (ret < 0) |
| 204 | return ret; |
| 205 | |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 206 | if (*trace_type == fc_trc_flag->fnic_trace) |
| 207 | fnic_tracing_enabled = val; |
| 208 | else if (*trace_type == fc_trc_flag->fc_trace) |
| 209 | fnic_fc_tracing_enabled = val; |
| 210 | else if (*trace_type == fc_trc_flag->fc_clear) |
| 211 | fnic_fc_trace_cleared = val; |
| 212 | else |
| 213 | pr_err("fnic: cannot write to any debufs file\n"); |
| 214 | |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 215 | (*ppos)++; |
| 216 | |
| 217 | return cnt; |
| 218 | } |
| 219 | |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 220 | static const struct file_operations fnic_trace_ctrl_fops = { |
| 221 | .owner = THIS_MODULE, |
| 222 | .open = fnic_trace_ctrl_open, |
| 223 | .read = fnic_trace_ctrl_read, |
| 224 | .write = fnic_trace_ctrl_write, |
| 225 | }; |
| 226 | |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 227 | /* |
| 228 | * fnic_trace_debugfs_open - Open the fnic trace log |
| 229 | * @inode: The inode pointer |
| 230 | * @file: The file pointer to attach the log output |
| 231 | * |
| 232 | * Description: |
| 233 | * This routine is the entry point for the debugfs open file operation. |
| 234 | * It allocates the necessary buffer for the log, fills the buffer from |
| 235 | * the in-memory log and then returns a pointer to that log in |
| 236 | * the private_data field in @file. |
| 237 | * |
| 238 | * Returns: |
| 239 | * This function returns zero if successful. On error it will return |
| 240 | * a negative error value. |
| 241 | */ |
| 242 | static int fnic_trace_debugfs_open(struct inode *inode, |
| 243 | struct file *file) |
| 244 | { |
| 245 | fnic_dbgfs_t *fnic_dbg_prt; |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 246 | u8 *rdata_ptr; |
| 247 | rdata_ptr = (u8 *)inode->i_private; |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 248 | fnic_dbg_prt = kzalloc(sizeof(fnic_dbgfs_t), GFP_KERNEL); |
| 249 | if (!fnic_dbg_prt) |
| 250 | return -ENOMEM; |
| 251 | |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 252 | if (*rdata_ptr == fc_trc_flag->fnic_trace) { |
| 253 | fnic_dbg_prt->buffer = vmalloc(3 * |
| 254 | (trace_max_pages * PAGE_SIZE)); |
| 255 | if (!fnic_dbg_prt->buffer) { |
| 256 | kfree(fnic_dbg_prt); |
| 257 | return -ENOMEM; |
| 258 | } |
| 259 | memset((void *)fnic_dbg_prt->buffer, 0, |
| 260 | 3 * (trace_max_pages * PAGE_SIZE)); |
| 261 | fnic_dbg_prt->buffer_len = fnic_get_trace_data(fnic_dbg_prt); |
| 262 | } else { |
| 263 | fnic_dbg_prt->buffer = |
| 264 | vmalloc(3 * (fnic_fc_trace_max_pages * PAGE_SIZE)); |
| 265 | if (!fnic_dbg_prt->buffer) { |
| 266 | kfree(fnic_dbg_prt); |
| 267 | return -ENOMEM; |
| 268 | } |
| 269 | memset((void *)fnic_dbg_prt->buffer, 0, |
| 270 | 3 * (fnic_fc_trace_max_pages * PAGE_SIZE)); |
| 271 | fnic_dbg_prt->buffer_len = |
| 272 | fnic_fc_trace_get_data(fnic_dbg_prt, *rdata_ptr); |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 273 | } |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 274 | file->private_data = fnic_dbg_prt; |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 275 | |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | /* |
| 280 | * fnic_trace_debugfs_lseek - Seek through a debugfs file |
| 281 | * @file: The file pointer to seek through. |
| 282 | * @offset: The offset to seek to or the amount to seek by. |
| 283 | * @howto: Indicates how to seek. |
| 284 | * |
| 285 | * Description: |
| 286 | * This routine is the entry point for the debugfs lseek file operation. |
| 287 | * The @howto parameter indicates whether @offset is the offset to directly |
| 288 | * seek to, or if it is a value to seek forward or reverse by. This function |
| 289 | * figures out what the new offset of the debugfs file will be and assigns |
| 290 | * that value to the f_pos field of @file. |
| 291 | * |
| 292 | * Returns: |
| 293 | * This function returns the new offset if successful and returns a negative |
| 294 | * error if unable to process the seek. |
| 295 | */ |
| 296 | static loff_t fnic_trace_debugfs_lseek(struct file *file, |
| 297 | loff_t offset, |
| 298 | int howto) |
| 299 | { |
| 300 | fnic_dbgfs_t *fnic_dbg_prt = file->private_data; |
Al Viro | eb5881d | 2013-06-17 17:44:23 +0400 | [diff] [blame] | 301 | return fixed_size_llseek(file, offset, howto, |
| 302 | fnic_dbg_prt->buffer_len); |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 303 | } |
| 304 | |
| 305 | /* |
| 306 | * fnic_trace_debugfs_read - Read a debugfs file |
| 307 | * @file: The file pointer to read from. |
| 308 | * @ubuf: The buffer to copy the data to. |
| 309 | * @nbytes: The number of bytes to read. |
| 310 | * @pos: The position in the file to start reading from. |
| 311 | * |
| 312 | * Description: |
| 313 | * This routine reads data from the buffer indicated in the private_data |
| 314 | * field of @file. It will start reading at @pos and copy up to @nbytes of |
| 315 | * data to @ubuf. |
| 316 | * |
| 317 | * Returns: |
| 318 | * This function returns the amount of data that was read (this could be |
| 319 | * less than @nbytes if the end of the file was reached). |
| 320 | */ |
| 321 | static ssize_t fnic_trace_debugfs_read(struct file *file, |
| 322 | char __user *ubuf, |
| 323 | size_t nbytes, |
| 324 | loff_t *pos) |
| 325 | { |
| 326 | fnic_dbgfs_t *fnic_dbg_prt = file->private_data; |
| 327 | int rc = 0; |
| 328 | rc = simple_read_from_buffer(ubuf, nbytes, pos, |
| 329 | fnic_dbg_prt->buffer, |
| 330 | fnic_dbg_prt->buffer_len); |
| 331 | return rc; |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * fnic_trace_debugfs_release - Release the buffer used to store |
| 336 | * debugfs file data |
| 337 | * @inode: The inode pointer |
| 338 | * @file: The file pointer that contains the buffer to release |
| 339 | * |
| 340 | * Description: |
| 341 | * This routine frees the buffer that was allocated when the debugfs |
| 342 | * file was opened. |
| 343 | * |
| 344 | * Returns: |
| 345 | * This function returns zero. |
| 346 | */ |
| 347 | static int fnic_trace_debugfs_release(struct inode *inode, |
| 348 | struct file *file) |
| 349 | { |
| 350 | fnic_dbgfs_t *fnic_dbg_prt = file->private_data; |
| 351 | |
| 352 | vfree(fnic_dbg_prt->buffer); |
| 353 | kfree(fnic_dbg_prt); |
| 354 | return 0; |
| 355 | } |
| 356 | |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 357 | static const struct file_operations fnic_trace_debugfs_fops = { |
| 358 | .owner = THIS_MODULE, |
| 359 | .open = fnic_trace_debugfs_open, |
| 360 | .llseek = fnic_trace_debugfs_lseek, |
| 361 | .read = fnic_trace_debugfs_read, |
| 362 | .release = fnic_trace_debugfs_release, |
| 363 | }; |
| 364 | |
| 365 | /* |
| 366 | * fnic_trace_debugfs_init - Initialize debugfs for fnic trace logging |
| 367 | * |
| 368 | * Description: |
| 369 | * When Debugfs is configured this routine sets up the fnic debugfs |
| 370 | * file system. If not already created, this routine will create the |
Hiral Patel | 67125b0 | 2013-09-12 17:45:42 -0700 | [diff] [blame] | 371 | * create file trace to log fnic trace buffer output into debugfs and |
| 372 | * it will also create file trace_enable to control enable/disable of |
| 373 | * trace logging into trace buffer. |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 374 | */ |
| 375 | int fnic_trace_debugfs_init(void) |
| 376 | { |
| 377 | int rc = -1; |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 378 | if (!fnic_trace_debugfs_root) { |
Hiral Patel | 67125b0 | 2013-09-12 17:45:42 -0700 | [diff] [blame] | 379 | printk(KERN_DEBUG |
| 380 | "FNIC Debugfs root directory doesn't exist\n"); |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 381 | return rc; |
| 382 | } |
| 383 | fnic_trace_enable = debugfs_create_file("tracing_enable", |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 384 | S_IFREG|S_IRUGO|S_IWUSR, |
| 385 | fnic_trace_debugfs_root, |
| 386 | &(fc_trc_flag->fnic_trace), |
| 387 | &fnic_trace_ctrl_fops); |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 388 | |
| 389 | if (!fnic_trace_enable) { |
Hiral Patel | 67125b0 | 2013-09-12 17:45:42 -0700 | [diff] [blame] | 390 | printk(KERN_DEBUG |
| 391 | "Cannot create trace_enable file under debugfs\n"); |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 392 | return rc; |
| 393 | } |
| 394 | |
| 395 | fnic_trace_debugfs_file = debugfs_create_file("trace", |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 396 | S_IFREG|S_IRUGO|S_IWUSR, |
| 397 | fnic_trace_debugfs_root, |
| 398 | &(fc_trc_flag->fnic_trace), |
| 399 | &fnic_trace_debugfs_fops); |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 400 | |
| 401 | if (!fnic_trace_debugfs_file) { |
Hiral Patel | 67125b0 | 2013-09-12 17:45:42 -0700 | [diff] [blame] | 402 | printk(KERN_DEBUG |
| 403 | "Cannot create trace file under debugfs\n"); |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 404 | return rc; |
| 405 | } |
| 406 | rc = 0; |
| 407 | return rc; |
| 408 | } |
| 409 | |
| 410 | /* |
| 411 | * fnic_trace_debugfs_terminate - Tear down debugfs infrastructure |
| 412 | * |
| 413 | * Description: |
| 414 | * When Debugfs is configured this routine removes debugfs file system |
| 415 | * elements that are specific to fnic trace logging. |
| 416 | */ |
| 417 | void fnic_trace_debugfs_terminate(void) |
| 418 | { |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 419 | debugfs_remove(fnic_trace_debugfs_file); |
| 420 | fnic_trace_debugfs_file = NULL; |
| 421 | |
| 422 | debugfs_remove(fnic_trace_enable); |
| 423 | fnic_trace_enable = NULL; |
| 424 | } |
| 425 | |
| 426 | /* |
| 427 | * fnic_fc_trace_debugfs_init - |
| 428 | * Initialize debugfs for fnic control frame trace logging |
| 429 | * |
| 430 | * Description: |
| 431 | * When Debugfs is configured this routine sets up the fnic_fc debugfs |
| 432 | * file system. If not already created, this routine will create the |
| 433 | * create file trace to log fnic fc trace buffer output into debugfs and |
| 434 | * it will also create file fc_trace_enable to control enable/disable of |
| 435 | * trace logging into trace buffer. |
| 436 | */ |
| 437 | |
| 438 | int fnic_fc_trace_debugfs_init(void) |
| 439 | { |
| 440 | int rc = -1; |
| 441 | |
| 442 | if (!fnic_trace_debugfs_root) { |
| 443 | pr_err("fnic:Debugfs root directory doesn't exist\n"); |
| 444 | return rc; |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 445 | } |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 446 | |
| 447 | fnic_fc_trace_enable = debugfs_create_file("fc_trace_enable", |
| 448 | S_IFREG|S_IRUGO|S_IWUSR, |
| 449 | fnic_trace_debugfs_root, |
| 450 | &(fc_trc_flag->fc_trace), |
| 451 | &fnic_trace_ctrl_fops); |
| 452 | |
| 453 | if (!fnic_fc_trace_enable) { |
| 454 | pr_err("fnic: Failed create fc_trace_enable file\n"); |
| 455 | return rc; |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 456 | } |
Hiral Shah | abb1414 | 2014-04-18 12:28:19 -0700 | [diff] [blame^] | 457 | |
| 458 | fnic_fc_trace_clear = debugfs_create_file("fc_trace_clear", |
| 459 | S_IFREG|S_IRUGO|S_IWUSR, |
| 460 | fnic_trace_debugfs_root, |
| 461 | &(fc_trc_flag->fc_clear), |
| 462 | &fnic_trace_ctrl_fops); |
| 463 | |
| 464 | if (!fnic_fc_trace_clear) { |
| 465 | pr_err("fnic: Failed to create fc_trace_enable file\n"); |
| 466 | return rc; |
| 467 | } |
| 468 | |
| 469 | fnic_fc_rdata_trace_debugfs_file = |
| 470 | debugfs_create_file("fc_trace_rdata", |
| 471 | S_IFREG|S_IRUGO|S_IWUSR, |
| 472 | fnic_trace_debugfs_root, |
| 473 | &(fc_trc_flag->fc_normal_file), |
| 474 | &fnic_trace_debugfs_fops); |
| 475 | |
| 476 | if (!fnic_fc_rdata_trace_debugfs_file) { |
| 477 | pr_err("fnic: Failed create fc_rdata_trace file\n"); |
| 478 | return rc; |
| 479 | } |
| 480 | |
| 481 | fnic_fc_trace_debugfs_file = |
| 482 | debugfs_create_file("fc_trace", |
| 483 | S_IFREG|S_IRUGO|S_IWUSR, |
| 484 | fnic_trace_debugfs_root, |
| 485 | &(fc_trc_flag->fc_row_file), |
| 486 | &fnic_trace_debugfs_fops); |
| 487 | |
| 488 | if (!fnic_fc_trace_debugfs_file) { |
| 489 | pr_err("fnic: Failed to create fc_trace file\n"); |
| 490 | return rc; |
| 491 | } |
| 492 | rc = 0; |
| 493 | return rc; |
| 494 | } |
| 495 | |
| 496 | /* |
| 497 | * fnic_fc_trace_debugfs_terminate - Tear down debugfs infrastructure |
| 498 | * |
| 499 | * Description: |
| 500 | * When Debugfs is configured this routine removes debugfs file system |
| 501 | * elements that are specific to fnic_fc trace logging. |
| 502 | */ |
| 503 | |
| 504 | void fnic_fc_trace_debugfs_terminate(void) |
| 505 | { |
| 506 | debugfs_remove(fnic_fc_trace_debugfs_file); |
| 507 | fnic_fc_trace_debugfs_file = NULL; |
| 508 | |
| 509 | debugfs_remove(fnic_fc_rdata_trace_debugfs_file); |
| 510 | fnic_fc_rdata_trace_debugfs_file = NULL; |
| 511 | |
| 512 | debugfs_remove(fnic_fc_trace_enable); |
| 513 | fnic_fc_trace_enable = NULL; |
| 514 | |
| 515 | debugfs_remove(fnic_fc_trace_clear); |
| 516 | fnic_fc_trace_clear = NULL; |
Hiral Patel | 67125b0 | 2013-09-12 17:45:42 -0700 | [diff] [blame] | 517 | } |
| 518 | |
| 519 | /* |
| 520 | * fnic_reset_stats_open - Open the reset_stats file |
| 521 | * @inode: The inode pointer. |
| 522 | * @file: The file pointer to attach the stats reset flag. |
| 523 | * |
| 524 | * Description: |
| 525 | * This routine opens a debugsfs file reset_stats and stores i_private data |
| 526 | * to debug structure to retrieve later for while performing other |
| 527 | * file oprations. |
| 528 | * |
| 529 | * Returns: |
| 530 | * This function returns zero if successful. |
| 531 | */ |
| 532 | static int fnic_reset_stats_open(struct inode *inode, struct file *file) |
| 533 | { |
| 534 | struct stats_debug_info *debug; |
| 535 | |
| 536 | debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL); |
| 537 | if (!debug) |
| 538 | return -ENOMEM; |
| 539 | |
| 540 | debug->i_private = inode->i_private; |
| 541 | |
| 542 | file->private_data = debug; |
| 543 | |
| 544 | return 0; |
| 545 | } |
| 546 | |
| 547 | /* |
| 548 | * fnic_reset_stats_read - Read a reset_stats debugfs file |
| 549 | * @filp: The file pointer to read from. |
| 550 | * @ubuf: The buffer to copy the data to. |
| 551 | * @cnt: The number of bytes to read. |
| 552 | * @ppos: The position in the file to start reading from. |
| 553 | * |
| 554 | * Description: |
| 555 | * This routine reads value of variable reset_stats |
| 556 | * and stores into local @buf. It will start reading file at @ppos and |
| 557 | * copy up to @cnt of data to @ubuf from @buf. |
| 558 | * |
| 559 | * Returns: |
| 560 | * This function returns the amount of data that was read. |
| 561 | */ |
| 562 | static ssize_t fnic_reset_stats_read(struct file *file, |
| 563 | char __user *ubuf, |
| 564 | size_t cnt, loff_t *ppos) |
| 565 | { |
| 566 | struct stats_debug_info *debug = file->private_data; |
| 567 | struct fnic *fnic = (struct fnic *)debug->i_private; |
| 568 | char buf[64]; |
| 569 | int len; |
| 570 | |
| 571 | len = sprintf(buf, "%u\n", fnic->reset_stats); |
| 572 | |
| 573 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
| 574 | } |
| 575 | |
| 576 | /* |
| 577 | * fnic_reset_stats_write - Write to reset_stats debugfs file |
| 578 | * @filp: The file pointer to write from. |
| 579 | * @ubuf: The buffer to copy the data from. |
| 580 | * @cnt: The number of bytes to write. |
| 581 | * @ppos: The position in the file to start writing to. |
| 582 | * |
| 583 | * Description: |
| 584 | * This routine writes data from user buffer @ubuf to buffer @buf and |
| 585 | * resets cumulative stats of fnic. |
| 586 | * |
| 587 | * Returns: |
| 588 | * This function returns the amount of data that was written. |
| 589 | */ |
| 590 | static ssize_t fnic_reset_stats_write(struct file *file, |
| 591 | const char __user *ubuf, |
| 592 | size_t cnt, loff_t *ppos) |
| 593 | { |
| 594 | struct stats_debug_info *debug = file->private_data; |
| 595 | struct fnic *fnic = (struct fnic *)debug->i_private; |
| 596 | struct fnic_stats *stats = &fnic->fnic_stats; |
| 597 | u64 *io_stats_p = (u64 *)&stats->io_stats; |
| 598 | u64 *fw_stats_p = (u64 *)&stats->fw_stats; |
| 599 | char buf[64]; |
| 600 | unsigned long val; |
| 601 | int ret; |
| 602 | |
| 603 | if (cnt >= sizeof(buf)) |
| 604 | return -EINVAL; |
| 605 | |
| 606 | if (copy_from_user(&buf, ubuf, cnt)) |
| 607 | return -EFAULT; |
| 608 | |
| 609 | buf[cnt] = 0; |
| 610 | |
| 611 | ret = kstrtoul(buf, 10, &val); |
| 612 | if (ret < 0) |
| 613 | return ret; |
| 614 | |
| 615 | fnic->reset_stats = val; |
| 616 | |
| 617 | if (fnic->reset_stats) { |
| 618 | /* Skip variable is used to avoid descrepancies to Num IOs |
| 619 | * and IO Completions stats. Skip incrementing No IO Compls |
| 620 | * for pending active IOs after reset stats |
| 621 | */ |
| 622 | atomic64_set(&fnic->io_cmpl_skip, |
| 623 | atomic64_read(&stats->io_stats.active_ios)); |
| 624 | memset(&stats->abts_stats, 0, sizeof(struct abort_stats)); |
| 625 | memset(&stats->term_stats, 0, |
| 626 | sizeof(struct terminate_stats)); |
| 627 | memset(&stats->reset_stats, 0, sizeof(struct reset_stats)); |
| 628 | memset(&stats->misc_stats, 0, sizeof(struct misc_stats)); |
| 629 | memset(&stats->vlan_stats, 0, sizeof(struct vlan_stats)); |
| 630 | memset(io_stats_p+1, 0, |
| 631 | sizeof(struct io_path_stats) - sizeof(u64)); |
| 632 | memset(fw_stats_p+1, 0, |
| 633 | sizeof(struct fw_stats) - sizeof(u64)); |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 634 | } |
Hiral Patel | 67125b0 | 2013-09-12 17:45:42 -0700 | [diff] [blame] | 635 | |
| 636 | (*ppos)++; |
| 637 | return cnt; |
| 638 | } |
| 639 | |
| 640 | /* |
| 641 | * fnic_reset_stats_release - Release the buffer used to store |
| 642 | * debugfs file data |
| 643 | * @inode: The inode pointer |
| 644 | * @file: The file pointer that contains the buffer to release |
| 645 | * |
| 646 | * Description: |
| 647 | * This routine frees the buffer that was allocated when the debugfs |
| 648 | * file was opened. |
| 649 | * |
| 650 | * Returns: |
| 651 | * This function returns zero. |
| 652 | */ |
| 653 | static int fnic_reset_stats_release(struct inode *inode, |
| 654 | struct file *file) |
| 655 | { |
| 656 | struct stats_debug_info *debug = file->private_data; |
| 657 | kfree(debug); |
| 658 | return 0; |
| 659 | } |
| 660 | |
| 661 | /* |
| 662 | * fnic_stats_debugfs_open - Open the stats file for specific host |
| 663 | * and get fnic stats. |
| 664 | * @inode: The inode pointer. |
| 665 | * @file: The file pointer to attach the specific host statistics. |
| 666 | * |
| 667 | * Description: |
| 668 | * This routine opens a debugsfs file stats of specific host and print |
| 669 | * fnic stats. |
| 670 | * |
| 671 | * Returns: |
| 672 | * This function returns zero if successful. |
| 673 | */ |
| 674 | static int fnic_stats_debugfs_open(struct inode *inode, |
| 675 | struct file *file) |
| 676 | { |
| 677 | struct fnic *fnic = inode->i_private; |
| 678 | struct fnic_stats *fnic_stats = &fnic->fnic_stats; |
| 679 | struct stats_debug_info *debug; |
| 680 | int buf_size = 2 * PAGE_SIZE; |
| 681 | |
| 682 | debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL); |
| 683 | if (!debug) |
| 684 | return -ENOMEM; |
| 685 | |
| 686 | debug->debug_buffer = vmalloc(buf_size); |
| 687 | if (!debug->debug_buffer) { |
| 688 | kfree(debug); |
| 689 | return -ENOMEM; |
| 690 | } |
| 691 | |
| 692 | debug->buf_size = buf_size; |
| 693 | memset((void *)debug->debug_buffer, 0, buf_size); |
| 694 | debug->buffer_len = fnic_get_stats_data(debug, fnic_stats); |
| 695 | |
| 696 | file->private_data = debug; |
| 697 | |
| 698 | return 0; |
| 699 | } |
| 700 | |
| 701 | /* |
| 702 | * fnic_stats_debugfs_read - Read a debugfs file |
| 703 | * @file: The file pointer to read from. |
| 704 | * @ubuf: The buffer to copy the data to. |
| 705 | * @nbytes: The number of bytes to read. |
| 706 | * @pos: The position in the file to start reading from. |
| 707 | * |
| 708 | * Description: |
| 709 | * This routine reads data from the buffer indicated in the private_data |
| 710 | * field of @file. It will start reading at @pos and copy up to @nbytes of |
| 711 | * data to @ubuf. |
| 712 | * |
| 713 | * Returns: |
| 714 | * This function returns the amount of data that was read (this could be |
| 715 | * less than @nbytes if the end of the file was reached). |
| 716 | */ |
| 717 | static ssize_t fnic_stats_debugfs_read(struct file *file, |
| 718 | char __user *ubuf, |
| 719 | size_t nbytes, |
| 720 | loff_t *pos) |
| 721 | { |
| 722 | struct stats_debug_info *debug = file->private_data; |
| 723 | int rc = 0; |
| 724 | rc = simple_read_from_buffer(ubuf, nbytes, pos, |
| 725 | debug->debug_buffer, |
| 726 | debug->buffer_len); |
| 727 | return rc; |
| 728 | } |
| 729 | |
| 730 | /* |
| 731 | * fnic_stats_stats_release - Release the buffer used to store |
| 732 | * debugfs file data |
| 733 | * @inode: The inode pointer |
| 734 | * @file: The file pointer that contains the buffer to release |
| 735 | * |
| 736 | * Description: |
| 737 | * This routine frees the buffer that was allocated when the debugfs |
| 738 | * file was opened. |
| 739 | * |
| 740 | * Returns: |
| 741 | * This function returns zero. |
| 742 | */ |
| 743 | static int fnic_stats_debugfs_release(struct inode *inode, |
| 744 | struct file *file) |
| 745 | { |
| 746 | struct stats_debug_info *debug = file->private_data; |
| 747 | vfree(debug->debug_buffer); |
| 748 | kfree(debug); |
| 749 | return 0; |
| 750 | } |
| 751 | |
| 752 | static const struct file_operations fnic_stats_debugfs_fops = { |
| 753 | .owner = THIS_MODULE, |
| 754 | .open = fnic_stats_debugfs_open, |
| 755 | .read = fnic_stats_debugfs_read, |
| 756 | .release = fnic_stats_debugfs_release, |
| 757 | }; |
| 758 | |
| 759 | static const struct file_operations fnic_reset_debugfs_fops = { |
| 760 | .owner = THIS_MODULE, |
| 761 | .open = fnic_reset_stats_open, |
| 762 | .read = fnic_reset_stats_read, |
| 763 | .write = fnic_reset_stats_write, |
| 764 | .release = fnic_reset_stats_release, |
| 765 | }; |
| 766 | |
| 767 | /* |
| 768 | * fnic_stats_init - Initialize stats struct and create stats file per fnic |
| 769 | * |
| 770 | * Description: |
| 771 | * When Debugfs is configured this routine sets up the stats file per fnic |
| 772 | * It will create file stats and reset_stats under statistics/host# directory |
| 773 | * to log per fnic stats. |
| 774 | */ |
| 775 | int fnic_stats_debugfs_init(struct fnic *fnic) |
| 776 | { |
| 777 | int rc = -1; |
| 778 | char name[16]; |
| 779 | |
| 780 | snprintf(name, sizeof(name), "host%d", fnic->lport->host->host_no); |
| 781 | |
| 782 | if (!fnic_stats_debugfs_root) { |
| 783 | printk(KERN_DEBUG "fnic_stats root doesn't exist\n"); |
| 784 | return rc; |
| 785 | } |
| 786 | fnic->fnic_stats_debugfs_host = debugfs_create_dir(name, |
| 787 | fnic_stats_debugfs_root); |
| 788 | if (!fnic->fnic_stats_debugfs_host) { |
| 789 | printk(KERN_DEBUG "Cannot create host directory\n"); |
| 790 | return rc; |
| 791 | } |
| 792 | |
| 793 | fnic->fnic_stats_debugfs_file = debugfs_create_file("stats", |
| 794 | S_IFREG|S_IRUGO|S_IWUSR, |
| 795 | fnic->fnic_stats_debugfs_host, |
| 796 | fnic, |
| 797 | &fnic_stats_debugfs_fops); |
| 798 | if (!fnic->fnic_stats_debugfs_file) { |
| 799 | printk(KERN_DEBUG "Cannot create host stats file\n"); |
| 800 | return rc; |
| 801 | } |
| 802 | |
| 803 | fnic->fnic_reset_debugfs_file = debugfs_create_file("reset_stats", |
| 804 | S_IFREG|S_IRUGO|S_IWUSR, |
| 805 | fnic->fnic_stats_debugfs_host, |
| 806 | fnic, |
| 807 | &fnic_reset_debugfs_fops); |
| 808 | if (!fnic->fnic_reset_debugfs_file) { |
| 809 | printk(KERN_DEBUG "Cannot create host stats file\n"); |
| 810 | return rc; |
| 811 | } |
| 812 | rc = 0; |
| 813 | return rc; |
| 814 | } |
| 815 | |
| 816 | /* |
| 817 | * fnic_stats_debugfs_remove - Tear down debugfs infrastructure of stats |
| 818 | * |
| 819 | * Description: |
| 820 | * When Debugfs is configured this routine removes debugfs file system |
| 821 | * elements that are specific to fnic stats. |
| 822 | */ |
| 823 | void fnic_stats_debugfs_remove(struct fnic *fnic) |
| 824 | { |
| 825 | if (!fnic) |
| 826 | return; |
| 827 | |
| 828 | debugfs_remove(fnic->fnic_stats_debugfs_file); |
| 829 | fnic->fnic_stats_debugfs_file = NULL; |
| 830 | |
| 831 | debugfs_remove(fnic->fnic_reset_debugfs_file); |
| 832 | fnic->fnic_reset_debugfs_file = NULL; |
| 833 | |
| 834 | debugfs_remove(fnic->fnic_stats_debugfs_host); |
| 835 | fnic->fnic_stats_debugfs_host = NULL; |
Hiral Patel | 4d7007b | 2013-02-12 17:01:02 -0800 | [diff] [blame] | 836 | } |