^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * SVC Greybus "watchdog" driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright 2016 Google Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/suspend.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/greybus.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #define SVC_WATCHDOG_PERIOD (2 * HZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) struct gb_svc_watchdog {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) struct delayed_work work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) struct gb_svc *svc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) bool enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) struct notifier_block pm_notifier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static struct delayed_work reset_work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static int svc_watchdog_pm_notifier(struct notifier_block *notifier,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) unsigned long pm_event, void *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct gb_svc_watchdog *watchdog =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) container_of(notifier, struct gb_svc_watchdog, pm_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) switch (pm_event) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) case PM_SUSPEND_PREPARE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) gb_svc_watchdog_disable(watchdog->svc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) case PM_POST_SUSPEND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) gb_svc_watchdog_enable(watchdog->svc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static void greybus_reset(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static char const start_path[] = "/system/bin/start";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static char *envp[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) "HOME=/",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) "PATH=/sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static char *argv[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) (char *)start_path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) "unipro_reset",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) pr_err("svc_watchdog: calling \"%s %s\" to reset greybus network!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) argv[0], argv[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) call_usermodehelper(start_path, argv, envp, UMH_WAIT_EXEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static void do_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct gb_svc_watchdog *watchdog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct gb_svc *svc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) watchdog = container_of(work, struct gb_svc_watchdog, work.work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) svc = watchdog->svc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) dev_dbg(&svc->dev, "%s: ping.\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) retval = gb_svc_ping(svc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (retval) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * Something went really wrong, let's warn userspace and then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * pull the plug and reset the whole greybus network.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * We need to do this outside of this workqueue as we will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * tearing down the svc device itself. So queue up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * yet-another-callback to do that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) dev_err(&svc->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) "SVC ping has returned %d, something is wrong!!!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (svc->action == GB_SVC_WATCHDOG_BITE_PANIC_KERNEL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) panic("SVC is not responding\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) } else if (svc->action == GB_SVC_WATCHDOG_BITE_RESET_UNIPRO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) dev_err(&svc->dev, "Resetting the greybus network, watch out!!!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) INIT_DELAYED_WORK(&reset_work, greybus_reset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) schedule_delayed_work(&reset_work, HZ / 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * Disable ourselves, we don't want to trip again unless
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * userspace wants us to.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) watchdog->enabled = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /* resubmit our work to happen again, if we are still "alive" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (watchdog->enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) schedule_delayed_work(&watchdog->work, SVC_WATCHDOG_PERIOD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) int gb_svc_watchdog_create(struct gb_svc *svc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct gb_svc_watchdog *watchdog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (svc->watchdog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) watchdog = kmalloc(sizeof(*watchdog), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (!watchdog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) watchdog->enabled = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) watchdog->svc = svc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) INIT_DELAYED_WORK(&watchdog->work, do_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) svc->watchdog = watchdog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) watchdog->pm_notifier.notifier_call = svc_watchdog_pm_notifier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) retval = register_pm_notifier(&watchdog->pm_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (retval) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) dev_err(&svc->dev, "error registering pm notifier(%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) goto svc_watchdog_create_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) retval = gb_svc_watchdog_enable(svc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (retval) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) dev_err(&svc->dev, "error enabling watchdog (%d)\n", retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) unregister_pm_notifier(&watchdog->pm_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) goto svc_watchdog_create_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) svc_watchdog_create_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) svc->watchdog = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) kfree(watchdog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) void gb_svc_watchdog_destroy(struct gb_svc *svc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) struct gb_svc_watchdog *watchdog = svc->watchdog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (!watchdog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) unregister_pm_notifier(&watchdog->pm_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) gb_svc_watchdog_disable(svc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) svc->watchdog = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) kfree(watchdog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) bool gb_svc_watchdog_enabled(struct gb_svc *svc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (!svc || !svc->watchdog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return svc->watchdog->enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) int gb_svc_watchdog_enable(struct gb_svc *svc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) struct gb_svc_watchdog *watchdog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (!svc->watchdog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) watchdog = svc->watchdog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (watchdog->enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) watchdog->enabled = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) schedule_delayed_work(&watchdog->work, SVC_WATCHDOG_PERIOD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) int gb_svc_watchdog_disable(struct gb_svc *svc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct gb_svc_watchdog *watchdog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (!svc->watchdog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) watchdog = svc->watchdog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) if (!watchdog->enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) watchdog->enabled = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) cancel_delayed_work_sync(&watchdog->work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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