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// SPDX-License-Identifier: GPL-2.0+
/*
* efi_selftest_tpl
*
* Copyright (c) 2017 Heinrich Schuchardt <xypron.glpk@gmx.de>
*
* 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\n");
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\n");
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\n");
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\n");
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\n");
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\n");
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\n");
return EFI_ST_FAILURE;
}
ret = boottime->check_event(event_wait);
if (ret != EFI_NOT_READY) {
efi_st_error("Signaled state was not cleared.\n");
efi_st_printf("ret = %u\n", (unsigned int)ret);
return EFI_ST_FAILURE;
}
if (index != 0) {
efi_st_error("WaitForEvent returned wrong index\n");
return EFI_ST_FAILURE;
}
if (notification_count < 8 || notification_count > 12) {
efi_st_printf(
"Notification count with TPL level TPL_APPLICATION: %u\n",
notification_count);
efi_st_error("Incorrect timing of events\n");
return EFI_ST_FAILURE;
}
ret = boottime->set_timer(event_notify, EFI_TIMER_STOP, 0);
if (ret != EFI_SUCCESS) {
efi_st_error("Could not cancel timer\n");
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 (ret != EFI_SUCCESS) {
efi_st_error("Could not set timer\n");
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\n");
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\n");
return EFI_ST_FAILURE;
}
if (notification_count != 0) {
efi_st_printf(
"Notification count with TPL level TPL_CALLBACK: %u\n",
notification_count);
efi_st_error("Suppressed timer fired\n");
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\n");
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\n");
return EFI_ST_FAILURE;
}
if (notification_count < 1) {
efi_st_printf(
"Notification count with TPL level TPL_APPLICATION: %u\n",
notification_count);
efi_st_error("Queued timer event did not fire\n");
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\n");
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,
};
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