Satyajit Desai | a485226 | 2017-04-26 10:01:20 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2012-2017, The Linux Foundation. All rights reserved. |
Satyajit Desai | 5255cea | 2016-08-04 16:02:50 -0700 | [diff] [blame] | 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/io.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/jiffies.h> |
| 19 | #include <linux/kthread.h> |
| 20 | #include <linux/mutex.h> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/interrupt.h> |
| 23 | #include <linux/irq.h> |
| 24 | #include <linux/percpu.h> |
| 25 | #include <linux/of.h> |
| 26 | #include <linux/cpu.h> |
| 27 | #include <linux/cpu_pm.h> |
| 28 | #include <linux/platform_device.h> |
| 29 | #include <linux/wait.h> |
| 30 | #include <soc/qcom/scm.h> |
| 31 | #include <soc/qcom/memory_dump.h> |
Lingutla Chandrasekhar | be48b07 | 2017-09-25 19:07:12 +0530 | [diff] [blame] | 32 | #include <soc/qcom/minidump.h> |
Satyajit Desai | 5255cea | 2016-08-04 16:02:50 -0700 | [diff] [blame] | 33 | #include <soc/qcom/watchdog.h> |
Satyajit Desai | a485226 | 2017-04-26 10:01:20 -0700 | [diff] [blame] | 34 | #include <linux/dma-mapping.h> |
Satyajit Desai | 5255cea | 2016-08-04 16:02:50 -0700 | [diff] [blame] | 35 | |
| 36 | #define MODULE_NAME "msm_watchdog" |
| 37 | #define WDT0_ACCSCSSNBARK_INT 0 |
| 38 | #define TCSR_WDT_CFG 0x30 |
| 39 | #define WDT0_RST 0x04 |
| 40 | #define WDT0_EN 0x08 |
| 41 | #define WDT0_STS 0x0C |
| 42 | #define WDT0_BARK_TIME 0x10 |
| 43 | #define WDT0_BITE_TIME 0x14 |
| 44 | |
| 45 | #define WDOG_ABSENT 0 |
| 46 | |
| 47 | #define EN 0 |
| 48 | #define UNMASKED_INT_EN 1 |
| 49 | |
| 50 | #define MASK_SIZE 32 |
| 51 | #define SCM_SET_REGSAVE_CMD 0x2 |
| 52 | #define SCM_SVC_SEC_WDOG_DIS 0x7 |
| 53 | #define MAX_CPU_CTX_SIZE 2048 |
Channagoud Kadabi | 9236f88 | 2017-10-16 14:46:09 -0700 | [diff] [blame] | 54 | #define MAX_CPU_SCANDUMP_SIZE 0x10100 |
Satyajit Desai | 5255cea | 2016-08-04 16:02:50 -0700 | [diff] [blame] | 55 | |
| 56 | static struct msm_watchdog_data *wdog_data; |
| 57 | |
| 58 | static int cpu_idle_pc_state[NR_CPUS]; |
| 59 | |
| 60 | /* |
| 61 | * user_pet_enable: |
| 62 | * Require userspace to write to a sysfs file every pet_time milliseconds. |
| 63 | * Disabled by default on boot. |
| 64 | */ |
| 65 | struct msm_watchdog_data { |
| 66 | unsigned int __iomem phys_base; |
| 67 | size_t size; |
| 68 | void __iomem *base; |
| 69 | void __iomem *wdog_absent_base; |
| 70 | struct device *dev; |
| 71 | unsigned int pet_time; |
| 72 | unsigned int bark_time; |
| 73 | unsigned int bark_irq; |
| 74 | unsigned int bite_irq; |
| 75 | bool do_ipi_ping; |
| 76 | bool wakeup_irq_enable; |
| 77 | unsigned long long last_pet; |
| 78 | unsigned int min_slack_ticks; |
| 79 | unsigned long long min_slack_ns; |
| 80 | void *scm_regsave; |
| 81 | cpumask_t alive_mask; |
| 82 | struct mutex disable_lock; |
| 83 | bool irq_ppi; |
| 84 | struct msm_watchdog_data __percpu **wdog_cpu_dd; |
| 85 | struct notifier_block panic_blk; |
| 86 | |
| 87 | bool enabled; |
| 88 | bool user_pet_enabled; |
| 89 | |
| 90 | struct task_struct *watchdog_task; |
| 91 | struct timer_list pet_timer; |
| 92 | wait_queue_head_t pet_complete; |
| 93 | |
| 94 | bool timer_expired; |
| 95 | bool user_pet_complete; |
| 96 | }; |
| 97 | |
| 98 | /* |
| 99 | * On the kernel command line specify |
| 100 | * watchdog_v2.enable=1 to enable the watchdog |
| 101 | * By default watchdog is turned on |
| 102 | */ |
| 103 | static int enable = 1; |
| 104 | module_param(enable, int, 0); |
| 105 | |
| 106 | /* |
| 107 | * On the kernel command line specify |
| 108 | * watchdog_v2.WDT_HZ=<clock val in HZ> to set Watchdog |
| 109 | * ticks. By default it is set to 32765. |
| 110 | */ |
| 111 | static long WDT_HZ = 32765; |
| 112 | module_param(WDT_HZ, long, 0); |
| 113 | |
| 114 | /* |
| 115 | * On the kernel command line specify |
| 116 | * watchdog_v2.ipi_opt_en=1 to enable the watchdog ipi ping |
| 117 | * optimization. By default it is turned off |
| 118 | */ |
| 119 | static int ipi_opt_en; |
| 120 | module_param(ipi_opt_en, int, 0); |
| 121 | |
| 122 | static void dump_cpu_alive_mask(struct msm_watchdog_data *wdog_dd) |
| 123 | { |
| 124 | static char alive_mask_buf[MASK_SIZE]; |
| 125 | |
| 126 | scnprintf(alive_mask_buf, MASK_SIZE, "%*pb1", cpumask_pr_args( |
| 127 | &wdog_dd->alive_mask)); |
| 128 | dev_info(wdog_dd->dev, "cpu alive mask from last pet %s\n", |
| 129 | alive_mask_buf); |
| 130 | } |
| 131 | |
| 132 | static int msm_watchdog_suspend(struct device *dev) |
| 133 | { |
| 134 | struct msm_watchdog_data *wdog_dd = |
| 135 | (struct msm_watchdog_data *)dev_get_drvdata(dev); |
| 136 | if (!enable) |
| 137 | return 0; |
| 138 | __raw_writel(1, wdog_dd->base + WDT0_RST); |
| 139 | if (wdog_dd->wakeup_irq_enable) { |
Sarangdhar Joshi | 1a00b60 | 2015-06-25 16:09:34 -0700 | [diff] [blame] | 140 | /* Make sure register write is complete before proceeding */ |
| 141 | mb(); |
Satyajit Desai | 5255cea | 2016-08-04 16:02:50 -0700 | [diff] [blame] | 142 | wdog_dd->last_pet = sched_clock(); |
| 143 | return 0; |
| 144 | } |
| 145 | __raw_writel(0, wdog_dd->base + WDT0_EN); |
| 146 | /* Make sure watchdog is suspended before setting enable */ |
| 147 | mb(); |
| 148 | wdog_dd->enabled = false; |
| 149 | wdog_dd->last_pet = sched_clock(); |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | static int msm_watchdog_resume(struct device *dev) |
| 154 | { |
| 155 | struct msm_watchdog_data *wdog_dd = |
| 156 | (struct msm_watchdog_data *)dev_get_drvdata(dev); |
Sarangdhar Joshi | 1a00b60 | 2015-06-25 16:09:34 -0700 | [diff] [blame] | 157 | if (!enable) |
Satyajit Desai | 5255cea | 2016-08-04 16:02:50 -0700 | [diff] [blame] | 158 | return 0; |
Sarangdhar Joshi | 1a00b60 | 2015-06-25 16:09:34 -0700 | [diff] [blame] | 159 | if (wdog_dd->wakeup_irq_enable) { |
| 160 | __raw_writel(1, wdog_dd->base + WDT0_RST); |
| 161 | /* Make sure register write is complete before proceeding */ |
| 162 | mb(); |
| 163 | wdog_dd->last_pet = sched_clock(); |
| 164 | return 0; |
| 165 | } |
Satyajit Desai | 5255cea | 2016-08-04 16:02:50 -0700 | [diff] [blame] | 166 | __raw_writel(1, wdog_dd->base + WDT0_EN); |
| 167 | __raw_writel(1, wdog_dd->base + WDT0_RST); |
| 168 | /* Make sure watchdog is reset before setting enable */ |
| 169 | mb(); |
| 170 | wdog_dd->enabled = true; |
| 171 | wdog_dd->last_pet = sched_clock(); |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | static int panic_wdog_handler(struct notifier_block *this, |
| 176 | unsigned long event, void *ptr) |
| 177 | { |
| 178 | struct msm_watchdog_data *wdog_dd = container_of(this, |
| 179 | struct msm_watchdog_data, panic_blk); |
| 180 | if (panic_timeout == 0) { |
| 181 | __raw_writel(0, wdog_dd->base + WDT0_EN); |
| 182 | /* Make sure watchdog is enabled before notifying the caller */ |
| 183 | mb(); |
| 184 | } else { |
| 185 | __raw_writel(WDT_HZ * (panic_timeout + 10), |
| 186 | wdog_dd->base + WDT0_BARK_TIME); |
| 187 | __raw_writel(WDT_HZ * (panic_timeout + 10), |
| 188 | wdog_dd->base + WDT0_BITE_TIME); |
| 189 | __raw_writel(1, wdog_dd->base + WDT0_RST); |
| 190 | } |
| 191 | return NOTIFY_DONE; |
| 192 | } |
| 193 | |
| 194 | static void wdog_disable(struct msm_watchdog_data *wdog_dd) |
| 195 | { |
| 196 | __raw_writel(0, wdog_dd->base + WDT0_EN); |
| 197 | /* Make sure watchdog is disabled before proceeding */ |
| 198 | mb(); |
| 199 | if (wdog_dd->irq_ppi) { |
| 200 | disable_percpu_irq(wdog_dd->bark_irq); |
| 201 | free_percpu_irq(wdog_dd->bark_irq, wdog_dd->wdog_cpu_dd); |
| 202 | } else |
| 203 | devm_free_irq(wdog_dd->dev, wdog_dd->bark_irq, wdog_dd); |
| 204 | enable = 0; |
| 205 | /*Ensure all cpus see update to enable*/ |
| 206 | smp_mb(); |
| 207 | atomic_notifier_chain_unregister(&panic_notifier_list, |
| 208 | &wdog_dd->panic_blk); |
| 209 | del_timer_sync(&wdog_dd->pet_timer); |
| 210 | /* may be suspended after the first write above */ |
| 211 | __raw_writel(0, wdog_dd->base + WDT0_EN); |
| 212 | /* Make sure watchdog is disabled before setting enable */ |
| 213 | mb(); |
| 214 | wdog_dd->enabled = false; |
| 215 | pr_info("MSM Apps Watchdog deactivated.\n"); |
| 216 | } |
| 217 | |
| 218 | static ssize_t wdog_disable_get(struct device *dev, |
| 219 | struct device_attribute *attr, char *buf) |
| 220 | { |
| 221 | int ret; |
| 222 | struct msm_watchdog_data *wdog_dd = dev_get_drvdata(dev); |
| 223 | |
| 224 | mutex_lock(&wdog_dd->disable_lock); |
| 225 | ret = snprintf(buf, PAGE_SIZE, "%d\n", enable == 0 ? 1 : 0); |
| 226 | mutex_unlock(&wdog_dd->disable_lock); |
| 227 | return ret; |
| 228 | } |
| 229 | |
| 230 | static ssize_t wdog_disable_set(struct device *dev, |
| 231 | struct device_attribute *attr, |
| 232 | const char *buf, size_t count) |
| 233 | { |
| 234 | int ret; |
| 235 | u8 disable; |
| 236 | struct msm_watchdog_data *wdog_dd = dev_get_drvdata(dev); |
| 237 | |
| 238 | ret = kstrtou8(buf, 10, &disable); |
| 239 | if (ret) { |
| 240 | dev_err(wdog_dd->dev, "invalid user input\n"); |
| 241 | return ret; |
| 242 | } |
| 243 | if (disable == 1) { |
| 244 | mutex_lock(&wdog_dd->disable_lock); |
| 245 | if (enable == 0) { |
| 246 | pr_info("MSM Apps Watchdog already disabled\n"); |
| 247 | mutex_unlock(&wdog_dd->disable_lock); |
| 248 | return count; |
| 249 | } |
| 250 | disable = 1; |
| 251 | if (!is_scm_armv8()) { |
| 252 | ret = scm_call(SCM_SVC_BOOT, SCM_SVC_SEC_WDOG_DIS, |
| 253 | &disable, sizeof(disable), NULL, 0); |
| 254 | } else { |
| 255 | struct scm_desc desc = {0}; |
| 256 | |
| 257 | desc.args[0] = 1; |
| 258 | desc.arginfo = SCM_ARGS(1); |
| 259 | ret = scm_call2(SCM_SIP_FNID(SCM_SVC_BOOT, |
| 260 | SCM_SVC_SEC_WDOG_DIS), &desc); |
| 261 | } |
| 262 | if (ret) { |
| 263 | dev_err(wdog_dd->dev, |
| 264 | "Failed to deactivate secure wdog\n"); |
| 265 | mutex_unlock(&wdog_dd->disable_lock); |
| 266 | return -EIO; |
| 267 | } |
| 268 | wdog_disable(wdog_dd); |
| 269 | mutex_unlock(&wdog_dd->disable_lock); |
| 270 | } else { |
| 271 | pr_err("invalid operation, only disable = 1 supported\n"); |
| 272 | return -EINVAL; |
| 273 | } |
| 274 | return count; |
| 275 | } |
| 276 | |
| 277 | static DEVICE_ATTR(disable, S_IWUSR | S_IRUSR, wdog_disable_get, |
| 278 | wdog_disable_set); |
| 279 | |
| 280 | /* |
| 281 | * Userspace Watchdog Support: |
| 282 | * Write 1 to the "user_pet_enabled" file to enable hw support for a |
| 283 | * userspace watchdog. |
| 284 | * Userspace is required to pet the watchdog by continuing to write 1 |
| 285 | * to this file in the expected interval. |
| 286 | * Userspace may disable this requirement by writing 0 to this same |
| 287 | * file. |
| 288 | */ |
| 289 | static void __wdog_user_pet(struct msm_watchdog_data *wdog_dd) |
| 290 | { |
| 291 | wdog_dd->user_pet_complete = true; |
| 292 | wake_up(&wdog_dd->pet_complete); |
| 293 | } |
| 294 | |
| 295 | static ssize_t wdog_user_pet_enabled_get(struct device *dev, |
| 296 | struct device_attribute *attr, char *buf) |
| 297 | { |
| 298 | int ret; |
| 299 | struct msm_watchdog_data *wdog_dd = dev_get_drvdata(dev); |
| 300 | |
| 301 | ret = snprintf(buf, PAGE_SIZE, "%d\n", |
| 302 | wdog_dd->user_pet_enabled); |
| 303 | return ret; |
| 304 | } |
| 305 | |
| 306 | static ssize_t wdog_user_pet_enabled_set(struct device *dev, |
| 307 | struct device_attribute *attr, |
| 308 | const char *buf, size_t count) |
| 309 | { |
| 310 | int ret; |
| 311 | struct msm_watchdog_data *wdog_dd = dev_get_drvdata(dev); |
| 312 | |
| 313 | ret = strtobool(buf, &wdog_dd->user_pet_enabled); |
| 314 | if (ret) { |
| 315 | dev_err(wdog_dd->dev, "invalid user input\n"); |
| 316 | return ret; |
| 317 | } |
| 318 | |
| 319 | __wdog_user_pet(wdog_dd); |
| 320 | |
| 321 | return count; |
| 322 | } |
| 323 | |
| 324 | static DEVICE_ATTR(user_pet_enabled, S_IWUSR | S_IRUSR, |
| 325 | wdog_user_pet_enabled_get, wdog_user_pet_enabled_set); |
| 326 | |
| 327 | static ssize_t wdog_pet_time_get(struct device *dev, |
| 328 | struct device_attribute *attr, char *buf) |
| 329 | { |
| 330 | int ret; |
| 331 | struct msm_watchdog_data *wdog_dd = dev_get_drvdata(dev); |
| 332 | |
| 333 | ret = snprintf(buf, PAGE_SIZE, "%d\n", wdog_dd->pet_time); |
| 334 | return ret; |
| 335 | } |
| 336 | |
| 337 | static DEVICE_ATTR(pet_time, S_IRUSR, wdog_pet_time_get, NULL); |
| 338 | |
| 339 | static void pet_watchdog(struct msm_watchdog_data *wdog_dd) |
| 340 | { |
| 341 | int slack, i, count, prev_count = 0; |
| 342 | unsigned long long time_ns; |
| 343 | unsigned long long slack_ns; |
| 344 | unsigned long long bark_time_ns = wdog_dd->bark_time * 1000000ULL; |
| 345 | |
| 346 | for (i = 0; i < 2; i++) { |
| 347 | count = (__raw_readl(wdog_dd->base + WDT0_STS) >> 1) & 0xFFFFF; |
| 348 | if (count != prev_count) { |
| 349 | prev_count = count; |
| 350 | i = 0; |
| 351 | } |
| 352 | } |
| 353 | slack = ((wdog_dd->bark_time * WDT_HZ) / 1000) - count; |
| 354 | if (slack < wdog_dd->min_slack_ticks) |
| 355 | wdog_dd->min_slack_ticks = slack; |
| 356 | __raw_writel(1, wdog_dd->base + WDT0_RST); |
| 357 | time_ns = sched_clock(); |
| 358 | slack_ns = (wdog_dd->last_pet + bark_time_ns) - time_ns; |
| 359 | if (slack_ns < wdog_dd->min_slack_ns) |
| 360 | wdog_dd->min_slack_ns = slack_ns; |
| 361 | wdog_dd->last_pet = time_ns; |
| 362 | } |
| 363 | |
| 364 | static void keep_alive_response(void *info) |
| 365 | { |
| 366 | int cpu = smp_processor_id(); |
| 367 | struct msm_watchdog_data *wdog_dd = (struct msm_watchdog_data *)info; |
| 368 | |
| 369 | cpumask_set_cpu(cpu, &wdog_dd->alive_mask); |
| 370 | /* Make sure alive mask is cleared and set in order */ |
| 371 | smp_mb(); |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * If this function does not return, it implies one of the |
| 376 | * other cpu's is not responsive. |
| 377 | */ |
| 378 | static void ping_other_cpus(struct msm_watchdog_data *wdog_dd) |
| 379 | { |
| 380 | int cpu; |
| 381 | |
| 382 | cpumask_clear(&wdog_dd->alive_mask); |
| 383 | /* Make sure alive mask is cleared and set in order */ |
| 384 | smp_mb(); |
| 385 | for_each_cpu(cpu, cpu_online_mask) { |
Olav Haugan | d584e82 | 2016-08-18 16:47:02 -0700 | [diff] [blame] | 386 | if (!cpu_idle_pc_state[cpu] && !cpu_isolated(cpu)) |
Satyajit Desai | 5255cea | 2016-08-04 16:02:50 -0700 | [diff] [blame] | 387 | smp_call_function_single(cpu, keep_alive_response, |
| 388 | wdog_dd, 1); |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | static void pet_task_wakeup(unsigned long data) |
| 393 | { |
| 394 | struct msm_watchdog_data *wdog_dd = |
| 395 | (struct msm_watchdog_data *)data; |
| 396 | wdog_dd->timer_expired = true; |
| 397 | wake_up(&wdog_dd->pet_complete); |
| 398 | } |
| 399 | |
| 400 | static __ref int watchdog_kthread(void *arg) |
| 401 | { |
| 402 | struct msm_watchdog_data *wdog_dd = |
| 403 | (struct msm_watchdog_data *)arg; |
| 404 | unsigned long delay_time = 0; |
| 405 | struct sched_param param = {.sched_priority = MAX_RT_PRIO-1}; |
| 406 | |
| 407 | sched_setscheduler(current, SCHED_FIFO, ¶m); |
| 408 | while (!kthread_should_stop()) { |
| 409 | while (wait_event_interruptible( |
| 410 | wdog_dd->pet_complete, |
| 411 | wdog_dd->timer_expired) != 0) |
| 412 | ; |
| 413 | |
| 414 | if (wdog_dd->do_ipi_ping) |
| 415 | ping_other_cpus(wdog_dd); |
| 416 | |
| 417 | while (wait_event_interruptible( |
| 418 | wdog_dd->pet_complete, |
| 419 | wdog_dd->user_pet_complete) != 0) |
| 420 | ; |
| 421 | |
| 422 | wdog_dd->timer_expired = false; |
| 423 | wdog_dd->user_pet_complete = !wdog_dd->user_pet_enabled; |
| 424 | |
| 425 | if (enable) { |
| 426 | delay_time = msecs_to_jiffies(wdog_dd->pet_time); |
| 427 | pet_watchdog(wdog_dd); |
| 428 | } |
| 429 | /* Check again before scheduling |
| 430 | * Could have been changed on other cpu |
| 431 | */ |
| 432 | mod_timer(&wdog_dd->pet_timer, jiffies + delay_time); |
| 433 | } |
| 434 | return 0; |
| 435 | } |
| 436 | |
| 437 | static int wdog_cpu_pm_notify(struct notifier_block *self, |
| 438 | unsigned long action, void *v) |
| 439 | { |
| 440 | int cpu; |
| 441 | |
| 442 | cpu = raw_smp_processor_id(); |
| 443 | |
| 444 | switch (action) { |
| 445 | case CPU_PM_ENTER: |
| 446 | cpu_idle_pc_state[cpu] = 1; |
| 447 | break; |
| 448 | case CPU_PM_ENTER_FAILED: |
| 449 | case CPU_PM_EXIT: |
| 450 | cpu_idle_pc_state[cpu] = 0; |
| 451 | break; |
| 452 | } |
| 453 | |
| 454 | return NOTIFY_OK; |
| 455 | } |
| 456 | |
| 457 | static struct notifier_block wdog_cpu_pm_nb = { |
| 458 | .notifier_call = wdog_cpu_pm_notify, |
| 459 | }; |
| 460 | |
| 461 | static int msm_watchdog_remove(struct platform_device *pdev) |
| 462 | { |
| 463 | struct msm_watchdog_data *wdog_dd = |
| 464 | (struct msm_watchdog_data *)platform_get_drvdata(pdev); |
| 465 | |
| 466 | if (ipi_opt_en) |
| 467 | cpu_pm_unregister_notifier(&wdog_cpu_pm_nb); |
| 468 | |
| 469 | mutex_lock(&wdog_dd->disable_lock); |
| 470 | if (enable) |
| 471 | wdog_disable(wdog_dd); |
| 472 | |
| 473 | mutex_unlock(&wdog_dd->disable_lock); |
| 474 | device_remove_file(wdog_dd->dev, &dev_attr_disable); |
| 475 | if (wdog_dd->irq_ppi) |
| 476 | free_percpu(wdog_dd->wdog_cpu_dd); |
| 477 | dev_info(wdog_dd->dev, "MSM Watchdog Exit - Deactivated\n"); |
| 478 | del_timer_sync(&wdog_dd->pet_timer); |
| 479 | kthread_stop(wdog_dd->watchdog_task); |
| 480 | kfree(wdog_dd); |
| 481 | return 0; |
| 482 | } |
| 483 | |
| 484 | void msm_trigger_wdog_bite(void) |
| 485 | { |
| 486 | if (!wdog_data) |
| 487 | return; |
| 488 | pr_info("Causing a watchdog bite!"); |
| 489 | __raw_writel(1, wdog_data->base + WDT0_BITE_TIME); |
| 490 | /* Mke sure bite time is written before we reset */ |
| 491 | mb(); |
| 492 | __raw_writel(1, wdog_data->base + WDT0_RST); |
| 493 | /* Make sure we wait only after reset */ |
| 494 | mb(); |
| 495 | /* Delay to make sure bite occurs */ |
| 496 | mdelay(10000); |
| 497 | pr_err("Wdog - STS: 0x%x, CTL: 0x%x, BARK TIME: 0x%x, BITE TIME: 0x%x", |
| 498 | __raw_readl(wdog_data->base + WDT0_STS), |
| 499 | __raw_readl(wdog_data->base + WDT0_EN), |
| 500 | __raw_readl(wdog_data->base + WDT0_BARK_TIME), |
| 501 | __raw_readl(wdog_data->base + WDT0_BITE_TIME)); |
| 502 | } |
| 503 | |
| 504 | static irqreturn_t wdog_bark_handler(int irq, void *dev_id) |
| 505 | { |
| 506 | struct msm_watchdog_data *wdog_dd = (struct msm_watchdog_data *)dev_id; |
| 507 | unsigned long nanosec_rem; |
| 508 | unsigned long long t = sched_clock(); |
| 509 | |
| 510 | nanosec_rem = do_div(t, 1000000000); |
| 511 | dev_info(wdog_dd->dev, "Watchdog bark! Now = %lu.%06lu\n", |
| 512 | (unsigned long) t, nanosec_rem / 1000); |
| 513 | |
| 514 | nanosec_rem = do_div(wdog_dd->last_pet, 1000000000); |
| 515 | dev_info(wdog_dd->dev, "Watchdog last pet at %lu.%06lu\n", |
| 516 | (unsigned long) wdog_dd->last_pet, nanosec_rem / 1000); |
| 517 | if (wdog_dd->do_ipi_ping) |
| 518 | dump_cpu_alive_mask(wdog_dd); |
| 519 | msm_trigger_wdog_bite(); |
| 520 | panic("Failed to cause a watchdog bite! - Falling back to kernel panic!"); |
| 521 | return IRQ_HANDLED; |
| 522 | } |
| 523 | |
| 524 | static irqreturn_t wdog_ppi_bark(int irq, void *dev_id) |
| 525 | { |
| 526 | struct msm_watchdog_data *wdog_dd = |
| 527 | *(struct msm_watchdog_data **)(dev_id); |
| 528 | return wdog_bark_handler(irq, wdog_dd); |
| 529 | } |
| 530 | |
| 531 | static void configure_bark_dump(struct msm_watchdog_data *wdog_dd) |
| 532 | { |
| 533 | int ret; |
| 534 | struct msm_dump_entry dump_entry; |
| 535 | struct msm_dump_data *cpu_data; |
| 536 | int cpu; |
| 537 | void *cpu_buf; |
| 538 | |
| 539 | cpu_data = kzalloc(sizeof(struct msm_dump_data) * |
| 540 | num_present_cpus(), GFP_KERNEL); |
| 541 | if (!cpu_data) |
| 542 | goto out0; |
| 543 | |
| 544 | cpu_buf = kzalloc(MAX_CPU_CTX_SIZE * num_present_cpus(), |
| 545 | GFP_KERNEL); |
| 546 | if (!cpu_buf) |
| 547 | goto out1; |
| 548 | |
| 549 | for_each_cpu(cpu, cpu_present_mask) { |
| 550 | cpu_data[cpu].addr = virt_to_phys(cpu_buf + |
| 551 | cpu * MAX_CPU_CTX_SIZE); |
| 552 | cpu_data[cpu].len = MAX_CPU_CTX_SIZE; |
Lingutla Chandrasekhar | be48b07 | 2017-09-25 19:07:12 +0530 | [diff] [blame] | 553 | snprintf(cpu_data[cpu].name, sizeof(cpu_data[cpu].name), |
| 554 | "KCPU_CTX%d", cpu); |
Satyajit Desai | 5255cea | 2016-08-04 16:02:50 -0700 | [diff] [blame] | 555 | dump_entry.id = MSM_DUMP_DATA_CPU_CTX + cpu; |
| 556 | dump_entry.addr = virt_to_phys(&cpu_data[cpu]); |
| 557 | ret = msm_dump_data_register(MSM_DUMP_TABLE_APPS, |
| 558 | &dump_entry); |
| 559 | /* |
| 560 | * Don't free the buffers in case of error since |
| 561 | * registration may have succeeded for some cpus. |
| 562 | */ |
| 563 | if (ret) |
| 564 | pr_err("cpu %d reg dump setup failed\n", cpu); |
| 565 | } |
| 566 | |
| 567 | return; |
| 568 | out1: |
| 569 | kfree(cpu_data); |
| 570 | out0: |
| 571 | return; |
| 572 | } |
| 573 | |
Satyajit Desai | a485226 | 2017-04-26 10:01:20 -0700 | [diff] [blame] | 574 | static void configure_scandump(struct msm_watchdog_data *wdog_dd) |
| 575 | { |
| 576 | int ret; |
| 577 | struct msm_dump_entry dump_entry; |
| 578 | struct msm_dump_data *cpu_data; |
| 579 | int cpu; |
| 580 | static dma_addr_t dump_addr; |
| 581 | static void *dump_vaddr; |
| 582 | |
| 583 | for_each_cpu(cpu, cpu_present_mask) { |
| 584 | cpu_data = devm_kzalloc(wdog_dd->dev, |
| 585 | sizeof(struct msm_dump_data), |
| 586 | GFP_KERNEL); |
| 587 | if (!cpu_data) |
| 588 | continue; |
| 589 | |
| 590 | dump_vaddr = (void *) dma_alloc_coherent(wdog_dd->dev, |
| 591 | MAX_CPU_SCANDUMP_SIZE, |
| 592 | &dump_addr, |
| 593 | GFP_KERNEL); |
| 594 | if (!dump_vaddr) { |
| 595 | dev_err(wdog_dd->dev, "Couldn't get memory for dump\n"); |
| 596 | continue; |
| 597 | } |
| 598 | memset(dump_vaddr, 0x0, MAX_CPU_SCANDUMP_SIZE); |
| 599 | |
| 600 | cpu_data->addr = dump_addr; |
| 601 | cpu_data->len = MAX_CPU_SCANDUMP_SIZE; |
Lingutla Chandrasekhar | be48b07 | 2017-09-25 19:07:12 +0530 | [diff] [blame] | 602 | snprintf(cpu_data->name, sizeof(cpu_data->name), |
| 603 | "KSCANDUMP%d", cpu); |
Satyajit Desai | a485226 | 2017-04-26 10:01:20 -0700 | [diff] [blame] | 604 | dump_entry.id = MSM_DUMP_DATA_SCANDUMP_PER_CPU + cpu; |
| 605 | dump_entry.addr = virt_to_phys(cpu_data); |
| 606 | ret = msm_dump_data_register(MSM_DUMP_TABLE_APPS, |
| 607 | &dump_entry); |
| 608 | if (ret) { |
| 609 | dev_err(wdog_dd->dev, "Dump setup failed, id = %d\n", |
| 610 | MSM_DUMP_DATA_SCANDUMP_PER_CPU + cpu); |
| 611 | dma_free_coherent(wdog_dd->dev, MAX_CPU_SCANDUMP_SIZE, |
| 612 | dump_vaddr, |
| 613 | dump_addr); |
| 614 | devm_kfree(wdog_dd->dev, cpu_data); |
| 615 | } |
| 616 | } |
| 617 | } |
| 618 | |
Satyajit Desai | 5255cea | 2016-08-04 16:02:50 -0700 | [diff] [blame] | 619 | static int init_watchdog_sysfs(struct msm_watchdog_data *wdog_dd) |
| 620 | { |
| 621 | int error = 0; |
| 622 | |
| 623 | error |= device_create_file(wdog_dd->dev, &dev_attr_disable); |
| 624 | |
| 625 | if (of_property_read_bool(wdog_dd->dev->of_node, |
| 626 | "qcom,userspace-watchdog")) { |
| 627 | error |= device_create_file(wdog_dd->dev, &dev_attr_pet_time); |
| 628 | error |= device_create_file(wdog_dd->dev, |
| 629 | &dev_attr_user_pet_enabled); |
| 630 | } |
| 631 | |
| 632 | if (error) |
| 633 | dev_err(wdog_dd->dev, "cannot create sysfs attribute\n"); |
| 634 | |
| 635 | return error; |
| 636 | } |
| 637 | |
| 638 | static void init_watchdog_data(struct msm_watchdog_data *wdog_dd) |
| 639 | { |
| 640 | unsigned long delay_time; |
| 641 | uint32_t val; |
| 642 | u64 timeout; |
| 643 | int ret; |
| 644 | |
| 645 | /* |
| 646 | * Disable the watchdog for cluster 1 so that cluster 0 watchdog will |
| 647 | * be mapped to the entire sub-system. |
| 648 | */ |
| 649 | if (wdog_dd->wdog_absent_base) |
| 650 | __raw_writel(2, wdog_dd->wdog_absent_base + WDOG_ABSENT); |
| 651 | |
| 652 | if (wdog_dd->irq_ppi) { |
| 653 | wdog_dd->wdog_cpu_dd = alloc_percpu(struct msm_watchdog_data *); |
| 654 | if (!wdog_dd->wdog_cpu_dd) { |
| 655 | dev_err(wdog_dd->dev, "fail to allocate cpu data\n"); |
| 656 | return; |
| 657 | } |
| 658 | *raw_cpu_ptr(wdog_dd->wdog_cpu_dd) = wdog_dd; |
| 659 | ret = request_percpu_irq(wdog_dd->bark_irq, wdog_ppi_bark, |
| 660 | "apps_wdog_bark", |
| 661 | wdog_dd->wdog_cpu_dd); |
| 662 | if (ret) { |
| 663 | dev_err(wdog_dd->dev, "failed to request bark irq\n"); |
| 664 | free_percpu(wdog_dd->wdog_cpu_dd); |
| 665 | return; |
| 666 | } |
| 667 | } else { |
| 668 | ret = devm_request_irq(wdog_dd->dev, wdog_dd->bark_irq, |
| 669 | wdog_bark_handler, IRQF_TRIGGER_RISING, |
| 670 | "apps_wdog_bark", wdog_dd); |
| 671 | if (ret) { |
| 672 | dev_err(wdog_dd->dev, "failed to request bark irq\n"); |
| 673 | return; |
| 674 | } |
| 675 | } |
| 676 | delay_time = msecs_to_jiffies(wdog_dd->pet_time); |
| 677 | wdog_dd->min_slack_ticks = UINT_MAX; |
| 678 | wdog_dd->min_slack_ns = ULLONG_MAX; |
Satyajit Desai | a485226 | 2017-04-26 10:01:20 -0700 | [diff] [blame] | 679 | configure_scandump(wdog_dd); |
Satyajit Desai | 5255cea | 2016-08-04 16:02:50 -0700 | [diff] [blame] | 680 | configure_bark_dump(wdog_dd); |
| 681 | timeout = (wdog_dd->bark_time * WDT_HZ)/1000; |
| 682 | __raw_writel(timeout, wdog_dd->base + WDT0_BARK_TIME); |
| 683 | __raw_writel(timeout + 3*WDT_HZ, wdog_dd->base + WDT0_BITE_TIME); |
| 684 | |
| 685 | wdog_dd->panic_blk.notifier_call = panic_wdog_handler; |
| 686 | atomic_notifier_chain_register(&panic_notifier_list, |
| 687 | &wdog_dd->panic_blk); |
| 688 | mutex_init(&wdog_dd->disable_lock); |
| 689 | init_waitqueue_head(&wdog_dd->pet_complete); |
| 690 | wdog_dd->timer_expired = false; |
| 691 | wdog_dd->user_pet_complete = true; |
| 692 | wdog_dd->user_pet_enabled = false; |
| 693 | wake_up_process(wdog_dd->watchdog_task); |
| 694 | init_timer(&wdog_dd->pet_timer); |
| 695 | wdog_dd->pet_timer.data = (unsigned long)wdog_dd; |
| 696 | wdog_dd->pet_timer.function = pet_task_wakeup; |
| 697 | wdog_dd->pet_timer.expires = jiffies + delay_time; |
| 698 | add_timer(&wdog_dd->pet_timer); |
| 699 | |
| 700 | val = BIT(EN); |
| 701 | if (wdog_dd->wakeup_irq_enable) |
| 702 | val |= BIT(UNMASKED_INT_EN); |
| 703 | __raw_writel(val, wdog_dd->base + WDT0_EN); |
| 704 | __raw_writel(1, wdog_dd->base + WDT0_RST); |
| 705 | wdog_dd->last_pet = sched_clock(); |
| 706 | wdog_dd->enabled = true; |
| 707 | |
| 708 | init_watchdog_sysfs(wdog_dd); |
| 709 | |
| 710 | if (wdog_dd->irq_ppi) |
| 711 | enable_percpu_irq(wdog_dd->bark_irq, 0); |
| 712 | if (ipi_opt_en) |
| 713 | cpu_pm_register_notifier(&wdog_cpu_pm_nb); |
| 714 | dev_info(wdog_dd->dev, "MSM Watchdog Initialized\n"); |
| 715 | } |
| 716 | |
| 717 | static const struct of_device_id msm_wdog_match_table[] = { |
| 718 | { .compatible = "qcom,msm-watchdog" }, |
| 719 | {} |
| 720 | }; |
| 721 | |
| 722 | static void dump_pdata(struct msm_watchdog_data *pdata) |
| 723 | { |
| 724 | dev_dbg(pdata->dev, "wdog bark_time %d", pdata->bark_time); |
| 725 | dev_dbg(pdata->dev, "wdog pet_time %d", pdata->pet_time); |
| 726 | dev_dbg(pdata->dev, "wdog perform ipi ping %d", pdata->do_ipi_ping); |
| 727 | dev_dbg(pdata->dev, "wdog base address is 0x%lx\n", (unsigned long) |
| 728 | pdata->base); |
| 729 | } |
| 730 | |
| 731 | static int msm_wdog_dt_to_pdata(struct platform_device *pdev, |
| 732 | struct msm_watchdog_data *pdata) |
| 733 | { |
| 734 | struct device_node *node = pdev->dev.of_node; |
| 735 | struct resource *res; |
| 736 | int ret; |
| 737 | |
| 738 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wdt-base"); |
| 739 | if (!res) |
| 740 | return -ENODEV; |
| 741 | pdata->size = resource_size(res); |
| 742 | pdata->phys_base = res->start; |
| 743 | if (unlikely(!(devm_request_mem_region(&pdev->dev, pdata->phys_base, |
| 744 | pdata->size, "msm-watchdog")))) { |
| 745 | |
| 746 | dev_err(&pdev->dev, "%s cannot reserve watchdog region\n", |
| 747 | __func__); |
| 748 | return -ENXIO; |
| 749 | } |
| 750 | pdata->base = devm_ioremap(&pdev->dev, pdata->phys_base, |
| 751 | pdata->size); |
| 752 | if (!pdata->base) { |
| 753 | dev_err(&pdev->dev, "%s cannot map wdog register space\n", |
| 754 | __func__); |
| 755 | return -ENXIO; |
| 756 | } |
| 757 | |
| 758 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, |
| 759 | "wdt-absent-base"); |
| 760 | if (res) { |
| 761 | pdata->wdog_absent_base = devm_ioremap(&pdev->dev, res->start, |
| 762 | resource_size(res)); |
| 763 | if (!pdata->wdog_absent_base) { |
| 764 | dev_err(&pdev->dev, |
| 765 | "cannot map wdog absent register space\n"); |
| 766 | return -ENXIO; |
| 767 | } |
| 768 | } else { |
| 769 | dev_info(&pdev->dev, "wdog absent resource not present\n"); |
| 770 | } |
| 771 | |
| 772 | pdata->bark_irq = platform_get_irq(pdev, 0); |
| 773 | pdata->bite_irq = platform_get_irq(pdev, 1); |
| 774 | ret = of_property_read_u32(node, "qcom,bark-time", &pdata->bark_time); |
| 775 | if (ret) { |
| 776 | dev_err(&pdev->dev, "reading bark time failed\n"); |
| 777 | return -ENXIO; |
| 778 | } |
| 779 | ret = of_property_read_u32(node, "qcom,pet-time", &pdata->pet_time); |
| 780 | if (ret) { |
| 781 | dev_err(&pdev->dev, "reading pet time failed\n"); |
| 782 | return -ENXIO; |
| 783 | } |
| 784 | pdata->do_ipi_ping = of_property_read_bool(node, "qcom,ipi-ping"); |
| 785 | if (!pdata->bark_time) { |
| 786 | dev_err(&pdev->dev, "%s watchdog bark time not setup\n", |
| 787 | __func__); |
| 788 | return -ENXIO; |
| 789 | } |
| 790 | if (!pdata->pet_time) { |
| 791 | dev_err(&pdev->dev, "%s watchdog pet time not setup\n", |
| 792 | __func__); |
| 793 | return -ENXIO; |
| 794 | } |
| 795 | pdata->wakeup_irq_enable = of_property_read_bool(node, |
| 796 | "qcom,wakeup-enable"); |
| 797 | |
| 798 | pdata->irq_ppi = irq_is_percpu(pdata->bark_irq); |
| 799 | dump_pdata(pdata); |
| 800 | return 0; |
| 801 | } |
| 802 | |
| 803 | static int msm_watchdog_probe(struct platform_device *pdev) |
| 804 | { |
| 805 | int ret; |
| 806 | struct msm_watchdog_data *wdog_dd; |
Lingutla Chandrasekhar | be48b07 | 2017-09-25 19:07:12 +0530 | [diff] [blame] | 807 | struct md_region md_entry; |
Satyajit Desai | 5255cea | 2016-08-04 16:02:50 -0700 | [diff] [blame] | 808 | |
| 809 | if (!pdev->dev.of_node || !enable) |
| 810 | return -ENODEV; |
| 811 | wdog_dd = kzalloc(sizeof(struct msm_watchdog_data), GFP_KERNEL); |
| 812 | if (!wdog_dd) |
| 813 | return -EIO; |
| 814 | ret = msm_wdog_dt_to_pdata(pdev, wdog_dd); |
| 815 | if (ret) |
| 816 | goto err; |
| 817 | |
| 818 | wdog_data = wdog_dd; |
| 819 | wdog_dd->dev = &pdev->dev; |
| 820 | platform_set_drvdata(pdev, wdog_dd); |
| 821 | cpumask_clear(&wdog_dd->alive_mask); |
| 822 | wdog_dd->watchdog_task = kthread_create(watchdog_kthread, wdog_dd, |
| 823 | "msm_watchdog"); |
| 824 | if (IS_ERR(wdog_dd->watchdog_task)) { |
| 825 | ret = PTR_ERR(wdog_dd->watchdog_task); |
| 826 | goto err; |
| 827 | } |
| 828 | init_watchdog_data(wdog_dd); |
Lingutla Chandrasekhar | be48b07 | 2017-09-25 19:07:12 +0530 | [diff] [blame] | 829 | |
| 830 | /* Add wdog info to minidump table */ |
| 831 | strlcpy(md_entry.name, "KWDOGDATA", sizeof(md_entry.name)); |
| 832 | md_entry.virt_addr = (uintptr_t)wdog_dd; |
| 833 | md_entry.phys_addr = virt_to_phys(wdog_dd); |
| 834 | md_entry.size = sizeof(*wdog_dd); |
| 835 | if (msm_minidump_add_region(&md_entry)) |
| 836 | pr_info("Failed to add Watchdog data in Minidump\n"); |
| 837 | |
Satyajit Desai | 5255cea | 2016-08-04 16:02:50 -0700 | [diff] [blame] | 838 | return 0; |
| 839 | err: |
| 840 | kzfree(wdog_dd); |
| 841 | return ret; |
| 842 | } |
| 843 | |
| 844 | static const struct dev_pm_ops msm_watchdog_dev_pm_ops = { |
| 845 | .suspend_noirq = msm_watchdog_suspend, |
| 846 | .resume_noirq = msm_watchdog_resume, |
| 847 | }; |
| 848 | |
| 849 | static struct platform_driver msm_watchdog_driver = { |
| 850 | .probe = msm_watchdog_probe, |
| 851 | .remove = msm_watchdog_remove, |
| 852 | .driver = { |
| 853 | .name = MODULE_NAME, |
| 854 | .owner = THIS_MODULE, |
| 855 | .pm = &msm_watchdog_dev_pm_ops, |
| 856 | .of_match_table = msm_wdog_match_table, |
| 857 | }, |
| 858 | }; |
| 859 | |
| 860 | static int init_watchdog(void) |
| 861 | { |
| 862 | return platform_driver_register(&msm_watchdog_driver); |
| 863 | } |
| 864 | |
| 865 | pure_initcall(init_watchdog); |
| 866 | MODULE_DESCRIPTION("MSM Watchdog Driver"); |
| 867 | MODULE_LICENSE("GPL v2"); |