1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * efi_selftest_events
4  *
5  * Copyright (c) 2017 Heinrich Schuchardt <xypron.glpk@gmx.de>
6  *
7  * This unit test uses timer events to check the implementation
8  * of the following boottime services:
9  * CreateEvent, CloseEvent, WaitForEvent, CheckEvent, SetTimer.
10  */
11 
12 #include <efi_selftest.h>
13 
14 static struct efi_event *event_notify;
15 static struct efi_event *event_wait;
16 static unsigned int timer_ticks;
17 static struct efi_boot_services *boottime;
18 
19 /*
20  * Notification function, increments the notification count if parameter
21  * context is provided.
22  *
23  * @event	notified event
24  * @context	pointer to the notification count
25  */
26 static void EFIAPI notify(struct efi_event *event, void *context)
27 {
28 	unsigned int *count = context;
29 
30 	if (count)
31 		++*count;
32 }
33 
34 /*
35  * Setup unit test.
36  *
37  * Create two timer events.
38  * One with EVT_NOTIFY_SIGNAL, the other with EVT_NOTIFY_WAIT.
39  *
40  * @handle:	handle of the loaded image
41  * @systable:	system table
42  * @return:	EFI_ST_SUCCESS for success
43  */
44 static int setup(const efi_handle_t handle,
45 		 const struct efi_system_table *systable)
46 {
47 	efi_status_t ret;
48 
49 	boottime = systable->boottime;
50 
51 	ret = boottime->create_event(EVT_TIMER | EVT_NOTIFY_SIGNAL,
52 				     TPL_CALLBACK, notify, (void *)&timer_ticks,
53 				     &event_notify);
54 	if (ret != EFI_SUCCESS) {
55 		efi_st_error("could not create event\n");
56 		return EFI_ST_FAILURE;
57 	}
58 	ret = boottime->create_event(EVT_TIMER | EVT_NOTIFY_WAIT,
59 				     TPL_CALLBACK, notify, NULL, &event_wait);
60 	if (ret != EFI_SUCCESS) {
61 		efi_st_error("could not create event\n");
62 		return EFI_ST_FAILURE;
63 	}
64 	return EFI_ST_SUCCESS;
65 }
66 
67 /*
68  * Tear down unit test.
69  *
70  * Close the events created in setup.
71  *
72  * @return:	EFI_ST_SUCCESS for success
73  */
74 static int teardown(void)
75 {
76 	efi_status_t ret;
77 
78 	if (event_notify) {
79 		ret = boottime->close_event(event_notify);
80 		event_notify = NULL;
81 		if (ret != EFI_SUCCESS) {
82 			efi_st_error("could not close event\n");
83 			return EFI_ST_FAILURE;
84 		}
85 	}
86 	if (event_wait) {
87 		ret = boottime->close_event(event_wait);
88 		event_wait = NULL;
89 		if (ret != EFI_SUCCESS) {
90 			efi_st_error("could not close event\n");
91 			return EFI_ST_FAILURE;
92 		}
93 	}
94 	return EFI_ST_SUCCESS;
95 }
96 
97 /*
98  * Execute unit test.
99  *
100  * Run a 10 ms periodic timer and check that it is called 10 times
101  * while waiting for 100 ms single shot timer.
102  *
103  * Run a 100 ms single shot timer and check that it is called once
104  * while waiting for 100 ms periodic timer for two periods.
105  *
106  * @return:	EFI_ST_SUCCESS for success
107  */
108 static int execute(void)
109 {
110 	efi_uintn_t index;
111 	efi_status_t ret;
112 
113 	/* Set 10 ms timer */
114 	timer_ticks = 0;
115 	ret = boottime->set_timer(event_notify, EFI_TIMER_PERIODIC, 100000);
116 	if (ret != EFI_SUCCESS) {
117 		efi_st_error("Could not set timer\n");
118 		return EFI_ST_FAILURE;
119 	}
120 	/* Set 100 ms timer */
121 	ret = boottime->set_timer(event_wait, EFI_TIMER_RELATIVE, 1000000);
122 	if (ret != EFI_SUCCESS) {
123 		efi_st_error("Could not set timer\n");
124 		return EFI_ST_FAILURE;
125 	}
126 
127 	/* Set some arbitrary non-zero value to make change detectable. */
128 	index = 5;
129 	ret = boottime->wait_for_event(1, &event_wait, &index);
130 	if (ret != EFI_SUCCESS) {
131 		efi_st_error("Could not wait for event\n");
132 		return EFI_ST_FAILURE;
133 	}
134 	ret = boottime->check_event(event_wait);
135 	if (ret != EFI_NOT_READY) {
136 		efi_st_error("Signaled state was not cleared.\n");
137 		efi_st_printf("ret = %u\n", (unsigned int)ret);
138 		return EFI_ST_FAILURE;
139 	}
140 	if (index != 0) {
141 		efi_st_error("WaitForEvent returned wrong index\n");
142 		return EFI_ST_FAILURE;
143 	}
144 	if (timer_ticks < 8 || timer_ticks > 12) {
145 		efi_st_printf("Notification count periodic: %u\n", timer_ticks);
146 		efi_st_error("Incorrect timing of events\n");
147 		return EFI_ST_FAILURE;
148 	}
149 	ret = boottime->set_timer(event_notify, EFI_TIMER_STOP, 0);
150 	if (index != 0) {
151 		efi_st_error("Could not cancel timer\n");
152 		return EFI_ST_FAILURE;
153 	}
154 	/* Set 10 ms timer */
155 	timer_ticks = 0;
156 	ret = boottime->set_timer(event_notify, EFI_TIMER_RELATIVE, 100000);
157 	if (index != 0) {
158 		efi_st_error("Could not set timer\n");
159 		return EFI_ST_FAILURE;
160 	}
161 	/* Set 100 ms timer */
162 	ret = boottime->set_timer(event_wait, EFI_TIMER_PERIODIC, 1000000);
163 	if (index != 0) {
164 		efi_st_error("Could not set timer\n");
165 		return EFI_ST_FAILURE;
166 	}
167 	ret = boottime->wait_for_event(1, &event_wait, &index);
168 	if (ret != EFI_SUCCESS) {
169 		efi_st_error("Could not wait for event\n");
170 		return EFI_ST_FAILURE;
171 	}
172 	if (timer_ticks != 1) {
173 		efi_st_printf("Notification count single shot: %u\n",
174 			      timer_ticks);
175 		efi_st_error("Single shot timer failed\n");
176 		return EFI_ST_FAILURE;
177 	}
178 	ret = boottime->wait_for_event(1, &event_wait, &index);
179 	if (ret != EFI_SUCCESS) {
180 		efi_st_error("Could not wait for event\n");
181 		return EFI_ST_FAILURE;
182 	}
183 	if (timer_ticks != 1) {
184 		efi_st_printf("Notification count stopped timer: %u\n",
185 			      timer_ticks);
186 		efi_st_error("Stopped timer fired\n");
187 		return EFI_ST_FAILURE;
188 	}
189 	ret = boottime->set_timer(event_wait, EFI_TIMER_STOP, 0);
190 	if (ret != EFI_SUCCESS) {
191 		efi_st_error("Could not cancel timer\n");
192 		return EFI_ST_FAILURE;
193 	}
194 
195 	return EFI_ST_SUCCESS;
196 }
197 
198 EFI_UNIT_TEST(events) = {
199 	.name = "event services",
200 	.phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
201 	.setup = setup,
202 	.execute = execute,
203 	.teardown = teardown,
204 };
205