The test verifies that resetting the watchdog timer ensures that it is not called during the timeout period. Testing that the watchdog timer actually executes a reset would require a test outside the efi_selftest framework. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Alexander Graf <agraf@suse.de>master
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/*
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* efi_selftest_watchdog |
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* |
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* Copyright (c) 2017 Heinrich Schuchardt <xypron.glpk@gmx.de> |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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* |
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* This unit test checks that the watchdog timer will not cause |
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* a system restart during the timeout period after a timer reset. |
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* |
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* Testing that the watchdog timer actually will reset the system |
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* after a timeout is not possible within the used framework. |
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*/ |
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#include <efi_selftest.h> |
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/*
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* This is the communication structure for the notification function. |
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*/ |
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struct notify_context { |
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/* Status code returned when resetting watchdog */ |
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efi_status_t status; |
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/* Number of invocations of the notification function */ |
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unsigned int timer_ticks; |
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}; |
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static struct efi_event *event_notify; |
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static struct efi_event *event_wait; |
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static struct efi_boot_services *boottime; |
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static struct notify_context notification_context; |
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/*
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* Notification function, increments the notfication count if parameter |
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* context is provided. |
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* |
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* @event notified event |
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* @context pointer to the timeout |
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*/ |
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static void EFIAPI notify(struct efi_event *event, void *context) |
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{ |
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struct notify_context *notify_context = context; |
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efi_status_t ret = EFI_SUCCESS; |
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if (!notify_context) |
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return; |
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/* Reset watchdog timer to one second */ |
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ret = boottime->set_watchdog_timer(1, 0, 0, NULL); |
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if (ret != EFI_SUCCESS) |
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notify_context->status = ret; |
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/* Count number of calls */ |
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notify_context->timer_ticks++; |
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} |
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/*
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* Setup unit test. |
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* |
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* Create two timer events. |
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* One with EVT_NOTIFY_SIGNAL, the other with EVT_NOTIFY_WAIT. |
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* |
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* @handle: handle of the loaded image |
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* @systable: system table |
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* @return: EFI_ST_SUCCESS for success |
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*/ |
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static int setup(const efi_handle_t handle, |
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const struct efi_system_table *systable) |
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{ |
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efi_status_t ret; |
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boottime = systable->boottime; |
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notification_context.status = EFI_SUCCESS; |
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notification_context.timer_ticks = 0; |
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ret = boottime->create_event(EVT_TIMER | EVT_NOTIFY_SIGNAL, |
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TPL_CALLBACK, notify, |
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(void *)¬ification_context, |
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&event_notify); |
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if (ret != EFI_SUCCESS) { |
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efi_st_error("could not create event\n"); |
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return EFI_ST_FAILURE; |
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} |
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ret = boottime->create_event(EVT_TIMER | EVT_NOTIFY_WAIT, |
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TPL_CALLBACK, notify, NULL, &event_wait); |
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if (ret != EFI_SUCCESS) { |
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efi_st_error("could not create event\n"); |
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return EFI_ST_FAILURE; |
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} |
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return EFI_ST_SUCCESS; |
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} |
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/*
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* Tear down unit test. |
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* |
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* Close the events created in setup. |
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* |
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* @return: EFI_ST_SUCCESS for success |
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*/ |
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static int teardown(void) |
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{ |
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efi_status_t ret; |
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/* Set the watchdog timer to the five minute default value */ |
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ret = boottime->set_watchdog_timer(300, 0, 0, NULL); |
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if (ret != EFI_SUCCESS) { |
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efi_st_error("Setting watchdog timer failed\n"); |
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return EFI_ST_FAILURE; |
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} |
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if (event_notify) { |
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ret = boottime->close_event(event_notify); |
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event_notify = NULL; |
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if (ret != EFI_SUCCESS) { |
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efi_st_error("Could not close event\n"); |
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return EFI_ST_FAILURE; |
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} |
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} |
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if (event_wait) { |
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ret = boottime->close_event(event_wait); |
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event_wait = NULL; |
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if (ret != EFI_SUCCESS) { |
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efi_st_error("Could not close event\n"); |
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return EFI_ST_FAILURE; |
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} |
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} |
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return EFI_ST_SUCCESS; |
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} |
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/*
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* Execute unit test. |
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* |
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* Run a 600 ms periodic timer that resets the watchdog to one second |
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* on every timer tick. |
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* |
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* Run a 1350 ms single shot timer and check that the 600ms timer has |
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* been called 2 times. |
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* |
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* @return: EFI_ST_SUCCESS for success |
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*/ |
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static int execute(void) |
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{ |
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size_t index; |
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efi_status_t ret; |
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/* Set the watchdog timeout to one second */ |
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ret = boottime->set_watchdog_timer(1, 0, 0, NULL); |
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if (ret != EFI_SUCCESS) { |
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efi_st_error("Setting watchdog timer failed\n"); |
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return EFI_ST_FAILURE; |
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} |
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/* Set 600 ms timer */ |
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ret = boottime->set_timer(event_notify, EFI_TIMER_PERIODIC, 6000000); |
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if (ret != EFI_SUCCESS) { |
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efi_st_error("Could not set timer\n"); |
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return EFI_ST_FAILURE; |
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} |
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/* Set 1350 ms timer */ |
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ret = boottime->set_timer(event_wait, EFI_TIMER_RELATIVE, 13500000); |
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if (ret != EFI_SUCCESS) { |
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efi_st_error("Could not set timer\n"); |
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return EFI_ST_FAILURE; |
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} |
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ret = boottime->wait_for_event(1, &event_wait, &index); |
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if (ret != EFI_SUCCESS) { |
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efi_st_error("Could not wait for event\n"); |
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return EFI_ST_FAILURE; |
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} |
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if (notification_context.status != EFI_SUCCESS) { |
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efi_st_error("Setting watchdog timer failed\n"); |
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return EFI_ST_FAILURE; |
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} |
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if (notification_context.timer_ticks != 2) { |
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efi_st_error("The timer was called %u times, expected 2.\n", |
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notification_context.timer_ticks); |
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return EFI_ST_FAILURE; |
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} |
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return EFI_ST_SUCCESS; |
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} |
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EFI_UNIT_TEST(watchdog) = { |
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.name = "watchdog timer", |
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.phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT, |
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.setup = setup, |
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.execute = execute, |
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.teardown = teardown, |
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}; |
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Reference in new issue