lib/efi_selftest/efi_selftest_tpl.c

   1 /*
   2  * efi_selftest_events
   3  *
   4  * Copyright (c) 2017 Heinrich Schuchardt <xypron.glpk@gmx.de>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  *
   8  * This unit test uses timer events to check the handling of
   9  * task priority levels.
  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 notification_count;
  17 static struct efi_boot_services *boottime;
  18
  19 /*
  20  * Notification function, increments the notification count.
  21  *
  22  * @event       notified event
  23  * @context     pointer to the notification count
  24  */
  25 static void EFIAPI notify(struct efi_event *event, void *context)
  26 {
  27         unsigned int *count = context;
  28
  29         if (count)
  30                 ++*count;
  31 }
  32
  33 /*
  34  * Setup unit test.
  35  *
  36  * Create two timer events.
  37  * One with EVT_NOTIFY_SIGNAL, the other with EVT_NOTIFY_WAIT.
  38  *
  39  * @handle:     handle of the loaded image
  40  * @systable:   system table
  41  * @return:     EFI_ST_SUCCESS for success
  42  */
  43 static int setup(const efi_handle_t handle,
  44                  const struct efi_system_table *systable)
  45 {
  46         efi_status_t ret;
  47
  48         boottime = systable->boottime;
  49
  50         ret = boottime->create_event(EVT_TIMER | EVT_NOTIFY_SIGNAL,
  51                                      TPL_CALLBACK, notify,
  52                                      (void *)&notification_count,
  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_HIGH_LEVEL, 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         boottime->restore_tpl(TPL_APPLICATION);
  95         return EFI_ST_SUCCESS;
  96 }
  97
  98 /*
  99  * Execute unit test.
 100  *
 101  * Run a 10 ms periodic timer and check that it is called 10 times
 102  * while waiting for 100 ms single shot timer.
 103  *
 104  * Raise the TPL level to the level of the 10 ms timer and observe
 105  * that the notification function is not called again.
 106  *
 107  * Lower the TPL level and check that the queued notification
 108  * function is called.
 109  *
 110  * @return:     EFI_ST_SUCCESS for success
 111  */
 112 static int execute(void)
 113 {
 114         efi_uintn_t index;
 115         efi_status_t ret;
 116         efi_uintn_t old_tpl;
 117
 118         /* Set 10 ms timer */
 119         notification_count = 0;
 120         ret = boottime->set_timer(event_notify, EFI_TIMER_PERIODIC, 100000);
 121         if (ret != EFI_SUCCESS) {
 122                 efi_st_error("Could not set timer\n");
 123                 return EFI_ST_FAILURE;
 124         }
 125         /* Set 100 ms timer */
 126         ret = boottime->set_timer(event_wait, EFI_TIMER_RELATIVE, 1000000);
 127         if (ret != EFI_SUCCESS) {
 128                 efi_st_error("Could not set timer\n");
 129                 return EFI_ST_FAILURE;
 130         }
 131         index = 5;
 132         ret = boottime->wait_for_event(1, &event_wait, &index);
 133         if (ret != EFI_SUCCESS) {
 134                 efi_st_error("Could not wait for event\n");
 135                 return EFI_ST_FAILURE;
 136         }
 137         ret = boottime->check_event(event_wait);
 138         if (ret != EFI_NOT_READY) {
 139                 efi_st_error("Signaled state was not cleared.\n");
 140                 efi_st_printf("ret = %u\n", (unsigned int)ret);
 141                 return EFI_ST_FAILURE;
 142         }
 143         if (index != 0) {
 144                 efi_st_error("WaitForEvent returned wrong index\n");
 145                 return EFI_ST_FAILURE;
 146         }
 147         efi_st_printf("Notification count with TPL level TPL_APPLICATION: %u\n",
 148                       notification_count);
 149         if (notification_count < 8 || notification_count > 12) {
 150                 efi_st_error("Incorrect timing of events\n");
 151                 return EFI_ST_FAILURE;
 152         }
 153         ret = boottime->set_timer(event_notify, EFI_TIMER_STOP, 0);
 154         if (index != 0) {
 155                 efi_st_error("Could not cancel timer\n");
 156                 return EFI_ST_FAILURE;
 157         }
 158         /* Raise TPL level */
 159         old_tpl = boottime->raise_tpl(TPL_CALLBACK);
 160         if (old_tpl != TPL_APPLICATION) {
 161                 efi_st_error("Initial TPL level was not TPL_APPLICATION");
 162                 return EFI_ST_FAILURE;
 163         }
 164         /* Set 10 ms timer */
 165         notification_count = 0;
 166         ret = boottime->set_timer(event_notify, EFI_TIMER_PERIODIC, 100000);
 167         if (index != 0) {
 168                 efi_st_error("Could not set timer\n");
 169                 return EFI_ST_FAILURE;
 170         }
 171         /* Set 100 ms timer */
 172         ret = boottime->set_timer(event_wait, EFI_TIMER_RELATIVE, 1000000);
 173         if (ret != EFI_SUCCESS) {
 174                 efi_st_error("Could not set timer\n");
 175                 return EFI_ST_FAILURE;
 176         }
 177         do {
 178                 ret = boottime->check_event(event_wait);
 179         } while (ret == EFI_NOT_READY);
 180         if (ret != EFI_SUCCESS) {
 181                 efi_st_error("Could not check event\n");
 182                 return EFI_ST_FAILURE;
 183         }
 184         efi_st_printf("Notification count with TPL level TPL_CALLBACK: %u\n",
 185                       notification_count);
 186         if (notification_count != 0) {
 187                 efi_st_error("Suppressed timer fired\n");
 188                 return EFI_ST_FAILURE;
 189         }
 190         /* Set 1 ms timer */
 191         ret = boottime->set_timer(event_wait, EFI_TIMER_RELATIVE, 1000);
 192         if (ret != EFI_SUCCESS) {
 193                 efi_st_error("Could not set timer\n");
 194                 return EFI_ST_FAILURE;
 195         }
 196         /* Restore the old TPL level */
 197         boottime->restore_tpl(TPL_APPLICATION);
 198         ret = boottime->wait_for_event(1, &event_wait, &index);
 199         if (ret != EFI_SUCCESS) {
 200                 efi_st_error("Could not wait for event\n");
 201                 return EFI_ST_FAILURE;
 202         }
 203         efi_st_printf("Notification count with TPL level TPL_APPLICATION: %u\n",
 204                       notification_count);
 205         if (notification_count < 1) {
 206                 efi_st_error("Queued timer event did not fire\n");
 207                 return EFI_ST_FAILURE;
 208         }
 209         ret = boottime->set_timer(event_wait, EFI_TIMER_STOP, 0);
 210         if (ret != EFI_SUCCESS) {
 211                 efi_st_error("Could not cancel timer\n");
 212                 return EFI_ST_FAILURE;
 213         }
 214
 215         return EFI_ST_SUCCESS;
 216 }
 217
 218 EFI_UNIT_TEST(tpl) = {
 219         .name = "task priority levels",
 220         .phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
 221         .setup = setup,
 222         .execute = execute,
 223         .teardown = teardown,
 224 };