1 // SPDX-License-Identifier: GPL-2.0+
3 * efi_selftest_watchdog
5 * Copyright (c) 2017 Heinrich Schuchardt <xypron.glpk@gmx.de>
7 * The 'watchdog timer' unit test checks that the watchdog timer
8 * will not cause a system restart during the timeout period after
11 * The 'watchdog reboot' unit test checks that the watchdog timer
12 * actually reboots the system after a timeout. The test is only
13 * executed on explicit request. Use the following commands:
15 * setenv efi_selftest watchdog reboot
19 #include <efi_selftest.h>
22 * This is the communication structure for the notification function.
24 struct notify_context {
25 /* Status code returned when resetting watchdog */
27 /* Number of invocations of the notification function */
28 unsigned int timer_ticks;
31 static struct efi_event *efi_st_event_notify;
32 static struct efi_event *efi_st_event_wait;
33 static struct efi_boot_services *boottime;
34 static struct notify_context notification_context;
35 static bool watchdog_reset;
38 * Notification function, increments the notification count if parameter
39 * context is provided.
41 * @event notified event
42 * @context pointer to the timeout
44 static void EFIAPI notify(struct efi_event *event, void *context)
46 struct notify_context *notify_context = context;
47 efi_status_t ret = EFI_SUCCESS;
52 /* Reset watchdog timer to one second */
53 ret = boottime->set_watchdog_timer(1, 0, 0, NULL);
54 if (ret != EFI_SUCCESS)
55 notify_context->status = ret;
56 /* Count number of calls */
57 notify_context->timer_ticks++;
63 * Create two timer events.
64 * One with EVT_NOTIFY_SIGNAL, the other with EVT_NOTIFY_WAIT.
66 * @handle: handle of the loaded image
67 * @systable: system table
68 * Return: EFI_ST_SUCCESS for success
70 static int setup(const efi_handle_t handle,
71 const struct efi_system_table *systable)
75 boottime = systable->boottime;
77 notification_context.status = EFI_SUCCESS;
78 notification_context.timer_ticks = 0;
79 ret = boottime->create_event(EVT_TIMER | EVT_NOTIFY_SIGNAL,
81 (void *)¬ification_context,
82 &efi_st_event_notify);
83 if (ret != EFI_SUCCESS) {
84 efi_st_error("could not create event\n");
85 return EFI_ST_FAILURE;
87 ret = boottime->create_event(EVT_TIMER | EVT_NOTIFY_WAIT,
88 TPL_CALLBACK, notify, NULL,
90 if (ret != EFI_SUCCESS) {
91 efi_st_error("could not create event\n");
92 return EFI_ST_FAILURE;
94 return EFI_ST_SUCCESS;
98 * Execute the test resetting the watchdog in a timely manner. No reboot occurs.
100 * @handle: handle of the loaded image
101 * @systable: system table
102 * Return: EFI_ST_SUCCESS for success
104 static int setup_timer(const efi_handle_t handle,
105 const struct efi_system_table *systable)
107 watchdog_reset = true;
108 return setup(handle, systable);
112 * Execute the test without resetting the watchdog. A system reboot occurs.
114 * @handle: handle of the loaded image
115 * @systable: system table
116 * Return: EFI_ST_SUCCESS for success
118 static int setup_reboot(const efi_handle_t handle,
119 const struct efi_system_table *systable)
121 watchdog_reset = false;
122 return setup(handle, systable);
126 * Tear down unit test.
128 * Close the events created in setup.
130 * Return: EFI_ST_SUCCESS for success
132 static int teardown(void)
136 /* Set the watchdog timer to the five minute default value */
137 ret = boottime->set_watchdog_timer(300, 0, 0, NULL);
138 if (ret != EFI_SUCCESS) {
139 efi_st_error("Setting watchdog timer failed\n");
140 return EFI_ST_FAILURE;
142 if (efi_st_event_notify) {
143 ret = boottime->close_event(efi_st_event_notify);
144 efi_st_event_notify = NULL;
145 if (ret != EFI_SUCCESS) {
146 efi_st_error("Could not close event\n");
147 return EFI_ST_FAILURE;
150 if (efi_st_event_wait) {
151 ret = boottime->close_event(efi_st_event_wait);
152 efi_st_event_wait = NULL;
153 if (ret != EFI_SUCCESS) {
154 efi_st_error("Could not close event\n");
155 return EFI_ST_FAILURE;
158 return EFI_ST_SUCCESS;
164 * Run a 600 ms periodic timer that resets the watchdog to one second
165 * on every timer tick.
167 * Run a 1350 ms single shot timer and check that the 600ms timer has
168 * been called 2 times.
170 * Return: EFI_ST_SUCCESS for success
172 static int execute(void)
177 /* Set the watchdog timeout to one second */
178 ret = boottime->set_watchdog_timer(1, 0, 0, NULL);
179 if (ret != EFI_SUCCESS) {
180 efi_st_error("Setting watchdog timer failed\n");
181 return EFI_ST_FAILURE;
183 if (watchdog_reset) {
184 /* Set 600 ms timer */
185 ret = boottime->set_timer(efi_st_event_notify,
186 EFI_TIMER_PERIODIC, 6000000);
187 if (ret != EFI_SUCCESS) {
188 efi_st_error("Could not set timer\n");
189 return EFI_ST_FAILURE;
192 /* Set 1350 ms timer */
193 ret = boottime->set_timer(efi_st_event_wait, EFI_TIMER_RELATIVE,
195 if (ret != EFI_SUCCESS) {
196 efi_st_error("Could not set timer\n");
197 return EFI_ST_FAILURE;
200 ret = boottime->wait_for_event(1, &efi_st_event_wait, &index);
201 if (ret != EFI_SUCCESS) {
202 efi_st_error("Could not wait for event\n");
203 return EFI_ST_FAILURE;
205 if (notification_context.status != EFI_SUCCESS) {
206 efi_st_error("Setting watchdog timer failed\n");
207 return EFI_ST_FAILURE;
209 if (notification_context.timer_ticks != 2) {
210 efi_st_error("The timer was called %u times, expected 2.\n",
211 notification_context.timer_ticks);
212 return EFI_ST_FAILURE;
214 return EFI_ST_SUCCESS;
217 EFI_UNIT_TEST(watchdog1) = {
218 .name = "watchdog timer",
219 .phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
220 .setup = setup_timer,
222 .teardown = teardown,
225 EFI_UNIT_TEST(watchdog2) = {
226 .name = "watchdog reboot",
227 .phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
228 .setup = setup_reboot,
230 .teardown = teardown,