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lib/efi_selftest/efi_selftest_tpl.c
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/* * efi_selftest_events * * Copyright (c) 2017 Heinrich Schuchardt <xypron.glpk@gmx.de> * * SPDX-License-Identifier: GPL-2.0+ * * This unit test uses timer events to check the handling of * task priority levels. */ #include <efi_selftest.h> static struct efi_event *event_notify; static struct efi_event *event_wait; static unsigned int notification_count; static struct efi_boot_services *boottime; /* * Notification function, increments the notification count. * * @event notified event * @context pointer to the notification count */ static void EFIAPI notify(struct efi_event *event, void *context) { unsigned int *count = context; if (count) ++*count; } /* * Setup unit test. * * Create two timer events. * One with EVT_NOTIFY_SIGNAL, the other with EVT_NOTIFY_WAIT. * * @handle: handle of the loaded image * @systable: system table * @return: EFI_ST_SUCCESS for success */ static int setup(const efi_handle_t handle, const struct efi_system_table *systable) { efi_status_t ret; boottime = systable->boottime; ret = boottime->create_event(EVT_TIMER | EVT_NOTIFY_SIGNAL, TPL_CALLBACK, notify, (void *)¬ification_count, &event_notify); if (ret != EFI_SUCCESS) { efi_st_error("could not create event "); return EFI_ST_FAILURE; } ret = boottime->create_event(EVT_TIMER | EVT_NOTIFY_WAIT, TPL_HIGH_LEVEL, notify, NULL, &event_wait); if (ret != EFI_SUCCESS) { efi_st_error("could not create event "); return EFI_ST_FAILURE; } return EFI_ST_SUCCESS; } /* * Tear down unit test. * * Close the events created in setup. * * @return: EFI_ST_SUCCESS for success */ static int teardown(void) { efi_status_t ret; if (event_notify) { ret = boottime->close_event(event_notify); event_notify = NULL; if (ret != EFI_SUCCESS) { efi_st_error("could not close event "); return EFI_ST_FAILURE; } } if (event_wait) { ret = boottime->close_event(event_wait); event_wait = NULL; if (ret != EFI_SUCCESS) { efi_st_error("could not close event "); return EFI_ST_FAILURE; } } boottime->restore_tpl(TPL_APPLICATION); return EFI_ST_SUCCESS; } /* * Execute unit test. * * Run a 10 ms periodic timer and check that it is called 10 times * while waiting for 100 ms single shot timer. * * Raise the TPL level to the level of the 10 ms timer and observe * that the notification function is not called again. * * Lower the TPL level and check that the queued notification * function is called. * * @return: EFI_ST_SUCCESS for success */ static int execute(void) { efi_uintn_t index; efi_status_t ret; efi_uintn_t old_tpl; /* Set 10 ms timer */ notification_count = 0; ret = boottime->set_timer(event_notify, EFI_TIMER_PERIODIC, 100000); if (ret != EFI_SUCCESS) { efi_st_error("Could not set timer "); return EFI_ST_FAILURE; } /* Set 100 ms timer */ ret = boottime->set_timer(event_wait, EFI_TIMER_RELATIVE, 1000000); if (ret != EFI_SUCCESS) { efi_st_error("Could not set timer "); return EFI_ST_FAILURE; } index = 5; ret = boottime->wait_for_event(1, &event_wait, &index); if (ret != EFI_SUCCESS) { efi_st_error("Could not wait for event "); return EFI_ST_FAILURE; } ret = boottime->check_event(event_wait); if (ret != EFI_NOT_READY) { efi_st_error("Signaled state was not cleared. "); efi_st_printf("ret = %u ", (unsigned int)ret); return EFI_ST_FAILURE; } if (index != 0) { efi_st_error("WaitForEvent returned wrong index "); return EFI_ST_FAILURE; } if (notification_count < 8 || notification_count > 12) { efi_st_printf( "Notification count with TPL level TPL_APPLICATION: %u ", notification_count); efi_st_error("Incorrect timing of events "); return EFI_ST_FAILURE; } ret = boottime->set_timer(event_notify, EFI_TIMER_STOP, 0); if (index != 0) { efi_st_error("Could not cancel timer "); return EFI_ST_FAILURE; } /* Raise TPL level */ old_tpl = boottime->raise_tpl(TPL_CALLBACK); if (old_tpl != TPL_APPLICATION) { efi_st_error("Initial TPL level was not TPL_APPLICATION"); return EFI_ST_FAILURE; } /* Set 10 ms timer */ notification_count = 0; ret = boottime->set_timer(event_notify, EFI_TIMER_PERIODIC, 100000); if (index != 0) { efi_st_error("Could not set timer "); return EFI_ST_FAILURE; } /* Set 100 ms timer */ ret = boottime->set_timer(event_wait, EFI_TIMER_RELATIVE, 1000000); if (ret != EFI_SUCCESS) { efi_st_error("Could not set timer "); return EFI_ST_FAILURE; } do { ret = boottime->check_event(event_wait); } while (ret == EFI_NOT_READY); if (ret != EFI_SUCCESS) { efi_st_error("Could not check event "); return EFI_ST_FAILURE; } if (notification_count != 0) { efi_st_printf( "Notification count with TPL level TPL_CALLBACK: %u ", notification_count); efi_st_error("Suppressed timer fired "); return EFI_ST_FAILURE; } /* Set 1 ms timer */ ret = boottime->set_timer(event_wait, EFI_TIMER_RELATIVE, 1000); if (ret != EFI_SUCCESS) { efi_st_error("Could not set timer "); return EFI_ST_FAILURE; } /* Restore the old TPL level */ boottime->restore_tpl(TPL_APPLICATION); ret = boottime->wait_for_event(1, &event_wait, &index); if (ret != EFI_SUCCESS) { efi_st_error("Could not wait for event "); return EFI_ST_FAILURE; } if (notification_count < 1) { efi_st_printf( "Notification count with TPL level TPL_APPLICATION: %u ", notification_count); efi_st_error("Queued timer event did not fire "); return EFI_ST_FAILURE; } ret = boottime->set_timer(event_wait, EFI_TIMER_STOP, 0); if (ret != EFI_SUCCESS) { efi_st_error("Could not cancel timer "); return EFI_ST_FAILURE; } return EFI_ST_SUCCESS; } EFI_UNIT_TEST(tpl) = { .name = "task priority levels", .phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT, .setup = setup, .execute = execute, .teardown = teardown, }; |