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/*
* Copyright (c) 2013 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "tmacros.h"
#include <stdio.h>
#include <inttypes.h>
#define CPU_COUNT 2
#define RUNNER_COUNT (CPU_COUNT + 1)
#define PRIO_STOP 2
#define PRIO_HIGH 3
#define PRIO_NORMAL 4
/* FIXME: Use atomic operations instead of volatile */
typedef struct {
uint32_t counter;
uint32_t unused_space_for_cache_line_alignment[7];
} cache_aligned_counter;
typedef struct {
cache_aligned_counter tokens_per_cpu[CPU_COUNT];
volatile cache_aligned_counter cycles_per_cpu[CPU_COUNT];
} test_counters;
typedef struct {
test_counters counters[RUNNER_COUNT];
volatile rtems_task_argument token;
rtems_id runner_ids[RUNNER_COUNT];
} test_context;
CPU_STRUCTURE_ALIGNMENT static test_context ctx_instance;
static void change_prio(rtems_id task, rtems_task_priority prio)
{
rtems_status_code sc;
rtems_task_priority unused;
sc = rtems_task_set_priority(task, prio, &unused);
rtems_test_assert(sc == RTEMS_SUCCESSFUL);
}
static void runner(rtems_task_argument self)
{
test_context *ctx = &ctx_instance;
rtems_task_argument next = (self + 1) % RUNNER_COUNT;
rtems_id next_runner = ctx->runner_ids[next];
test_counters *counters = &ctx->counters[self];
test_counters *next_counters = &ctx->counters[next];
while (true) {
uint32_t current_cpu = rtems_smp_get_current_processor();
++counters->cycles_per_cpu[current_cpu].counter;
if (ctx->token == self) {
uint32_t other_cpu = (current_cpu + 1) % CPU_COUNT;
uint32_t snapshot;
++counters->tokens_per_cpu[current_cpu].counter;
change_prio(next_runner, PRIO_HIGH);
snapshot = next_counters->cycles_per_cpu[other_cpu].counter;
while (next_counters->cycles_per_cpu[other_cpu].counter == snapshot) {
/* Wait for other thread to resume execution */
}
ctx->token = next;
change_prio(RTEMS_SELF, PRIO_NORMAL);
}
}
}
static void stopper(rtems_task_argument arg)
{
(void) arg;
while (true) {
/* Do nothing */
}
}
static void test(void)
{
test_context *ctx = &ctx_instance;
rtems_status_code sc;
rtems_task_argument runner_index;
rtems_id stopper_id;
uint32_t expected_tokens;
uint32_t total_delta;
sc = rtems_task_create(
rtems_build_name('S', 'T', 'O', 'P'),
PRIO_STOP,
RTEMS_MINIMUM_STACK_SIZE,
RTEMS_DEFAULT_MODES,
RTEMS_DEFAULT_ATTRIBUTES,
&stopper_id
);
rtems_test_assert(sc == RTEMS_SUCCESSFUL);
for (runner_index = 0; runner_index < RUNNER_COUNT; ++runner_index) {
sc = rtems_task_create(
rtems_build_name('R', 'U', 'N', (char) ('0' + runner_index)),
PRIO_HIGH + runner_index,
RTEMS_MINIMUM_STACK_SIZE,
RTEMS_DEFAULT_MODES,
RTEMS_DEFAULT_ATTRIBUTES,
&ctx->runner_ids[runner_index]
);
rtems_test_assert(sc == RTEMS_SUCCESSFUL);
}
for (runner_index = 0; runner_index < RUNNER_COUNT; ++runner_index) {
sc = rtems_task_start(ctx->runner_ids[runner_index], runner, runner_index);
rtems_test_assert(sc == RTEMS_SUCCESSFUL);
}
sc = rtems_task_wake_after(10 * rtems_clock_get_ticks_per_second());
rtems_test_assert(sc == RTEMS_SUCCESSFUL);
sc = rtems_task_start(stopper_id, stopper, 0);
rtems_test_assert(sc == RTEMS_SUCCESSFUL);
for (runner_index = 0; runner_index < RUNNER_COUNT; ++runner_index) {
test_counters *counters = &ctx->counters[runner_index];
size_t cpu;
printf("runner %" PRIuPTR "\n", runner_index);
for (cpu = 0; cpu < CPU_COUNT; ++cpu) {
printf(
"\tcpu %zu tokens %" PRIu32 "\n"
"\tcpu %zu cycles %" PRIu32 "\n",
cpu,
counters->tokens_per_cpu[cpu].counter,
cpu,
counters->cycles_per_cpu[cpu].counter
);
}
}
expected_tokens = ctx->counters[0].tokens_per_cpu[0].counter;
total_delta = 0;
for (runner_index = 0; runner_index < RUNNER_COUNT; ++runner_index) {
test_counters *counters = &ctx->counters[runner_index];
size_t cpu;
for (cpu = 0; cpu < CPU_COUNT; ++cpu) {
uint32_t tokens = counters->tokens_per_cpu[cpu].counter;
uint32_t delta = tokens > expected_tokens ?
tokens - expected_tokens : expected_tokens - tokens;
rtems_test_assert(delta <= 1);
total_delta += delta;
}
}
rtems_test_assert(total_delta <= (RUNNER_COUNT * CPU_COUNT - 1));
}
static void Init(rtems_task_argument arg)
{
puts("\n\n*** TEST SMPMIGRATION 1 ***");
if (rtems_smp_get_processor_count() >= 2) {
test();
}
puts("*** END OF TEST SMPMIGRATION 1 ***");
rtems_test_exit(0);
}
#define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
#define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
#define CONFIGURE_SMP_APPLICATION
#define CONFIGURE_SMP_MAXIMUM_PROCESSORS CPU_COUNT
#define CONFIGURE_MAXIMUM_TASKS (2 + RUNNER_COUNT)
#define CONFIGURE_RTEMS_INIT_TASKS_TABLE
#define CONFIGURE_INIT
#include <rtems/confdefs.h>
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