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/* Copyright 2020 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <kernel.h>
#include <init.h>
#include <sys/atomic.h>
#include "common.h"
#include "task.h"
/* We need to ensure that is one lower priority for the deferred task */
BUILD_ASSERT(CONFIG_NUM_PREEMPT_PRIORITIES + 1 >= TASK_ID_COUNT,
"Must increase number of available preempt priorities");
/* Declare all task stacks here */
#define CROS_EC_TASK(name, e, p, size) \
K_THREAD_STACK_DEFINE(name##_STACK, size);
CROS_EC_TASK_LIST
#undef CROS_EC_TASK
/* Forward declare all task entry point functions */
#define CROS_EC_TASK(name, entry, ...) void entry(void *p);
CROS_EC_TASK_LIST
#undef CROS_EC_TASK
/** Context for each CROS EC task that is run in its own zephyr thread */
struct task_ctx {
/** Name of thread (for debugging) */
const char *name;
/** Zephyr thread structure that hosts EC tasks */
struct k_thread zephyr_thread;
/** Zephyr thread id for above thread */
k_tid_t zephyr_tid;
/** Address of Zephyr thread's stack */
k_thread_stack_t *stack;
/** Usabled size in bytes of above thread stack */
size_t stack_size;
/** Task (platform/ec) entry point */
void (*entry)(void *p);
/** The parameter that is passed into the task entry point */
intptr_t parameter;
/** A wait-able event that is raised when a new task event is posted */
struct k_poll_signal new_event;
/** The current platform/ec events set for this task/thread */
uint32_t event_mask;
};
#define CROS_EC_TASK(_name, _entry, _parameter, _size) \
{ \
.entry = _entry, \
.parameter = _parameter, \
.stack = _name##_STACK, \
.stack_size = _size, \
.name = #_name, \
},
static struct task_ctx shimmed_tasks[] = { CROS_EC_TASK_LIST };
#undef CROS_EC_TASK
task_id_t task_get_current(void)
{
for (size_t i = 0; i < ARRAY_SIZE(shimmed_tasks); ++i) {
if (shimmed_tasks[i].zephyr_tid == k_current_get()) {
return i;
}
}
__ASSERT(false, "Task index out of bound");
return 0;
}
uint32_t task_set_event(task_id_t cros_task_id, uint32_t event, int wait)
{
struct task_ctx *const ctx = &shimmed_tasks[cros_task_id];
atomic_or(&ctx->event_mask, event);
k_poll_signal_raise(&ctx->new_event, 0);
/* TODO(b/172360521): Remove wait parameter from EC. No one uses it */
return 0;
}
uint32_t task_wait_event(int timeout_us)
{
struct task_ctx *const ctx = &shimmed_tasks[task_get_current()];
const k_timeout_t timeout = (timeout_us == -1) ? K_FOREVER :
K_USEC(timeout_us);
const int64_t tick_deadline =
k_uptime_ticks() + k_us_to_ticks_near64(timeout_us);
struct k_poll_event poll_events[1] = {
K_POLL_EVENT_INITIALIZER(K_POLL_TYPE_SIGNAL,
K_POLL_MODE_NOTIFY_ONLY,
&ctx->new_event),
};
/* Wait for signal, then clear it before reading events */
const int rv = k_poll(poll_events, ARRAY_SIZE(poll_events), timeout);
k_poll_signal_reset(&ctx->new_event);
uint32_t events = atomic_set(&ctx->event_mask, 0);
if (rv == -EAGAIN) {
events |= TASK_EVENT_TIMER;
}
/* If we didn't get an event, we need to wait again. There is a very
* small change of us reading the event_mask one signaled event too
* early. In that case, just wait again for the remaining timeout
*/
if (events == 0) {
const int64_t ticks_left = tick_deadline - k_uptime_ticks();
if (ticks_left > 0) {
return task_wait_event(
k_ticks_to_us_near64(ticks_left));
}
events |= TASK_EVENT_TIMER;
}
return events;
}
uint32_t task_wait_event_mask(uint32_t event_mask, int timeout_us)
{
struct task_ctx *const ctx = &shimmed_tasks[task_get_current()];
uint32_t events = 0;
const int64_t tick_deadline =
k_uptime_ticks() + k_us_to_ticks_near64(timeout_us);
/* Need to return timeout flags if it occurs as well */
event_mask |= TASK_EVENT_TIMER;
while (!(event_mask & events)) {
const int64_t ticks_left = tick_deadline - k_uptime_ticks();
if (timeout_us != -1 && ticks_left <= 0) {
events |= TASK_EVENT_TIMER;
break;
}
struct k_poll_event poll_events[1] = {
K_POLL_EVENT_INITIALIZER(K_POLL_TYPE_SIGNAL,
K_POLL_MODE_NOTIFY_ONLY,
&ctx->new_event),
};
/* Ensure to honor the -1 timeout as FOREVER */
k_poll(poll_events, ARRAY_SIZE(poll_events),
timeout_us == -1 ? K_FOREVER : K_TICKS(ticks_left));
k_poll_signal_reset(&ctx->new_event);
events |= atomic_set(&ctx->event_mask, 0);
}
/* Replace any events that weren't in the mask */
if (events & ~event_mask) {
atomic_or(&ctx->event_mask, events & ~event_mask);
k_poll_signal_raise(&ctx->new_event, 0);
}
return events & event_mask;
}
static void task_entry(void *task_contex, void *unused1, void *unused2)
{
ARG_UNUSED(unused1);
ARG_UNUSED(unused2);
struct task_ctx *const ctx = (struct task_ctx *)task_contex;
/* Name thread for debugging */
k_thread_name_set(ctx->zephyr_tid, ctx->name);
/* Call into task entry point */
ctx->entry((void *)ctx->parameter);
}
void start_ec_tasks(void)
{
for (size_t i = 0; i < ARRAY_SIZE(shimmed_tasks); ++i) {
struct task_ctx *const ctx = &shimmed_tasks[i];
/*
* TODO(b/172361873): Add K_FP_REGS for FPU tasks. See
* comment in config.h for CONFIG_TASK_LIST for existing flags
* implementation.
*/
ctx->zephyr_tid = k_thread_create(
&ctx->zephyr_thread, ctx->stack, ctx->stack_size,
task_entry, ctx, NULL, NULL,
K_PRIO_PREEMPT(TASK_ID_COUNT - i - 1), 0, K_NO_WAIT);
}
}
/*
* Initialize all of the kernel objects before application code starts.
* This allows us to set events on tasks before they even start, e.g. in
* INIT_HOOKS.
*/
int init_signals(const struct device *unused)
{
ARG_UNUSED(unused);
for (size_t i = 0; i < ARRAY_SIZE(shimmed_tasks); ++i) {
struct task_ctx *const ctx = &shimmed_tasks[i];
/* Initialize the new_event structure */
k_poll_signal_init(&ctx->new_event);
}
return 0;
}
SYS_INIT(init_signals, POST_KERNEL, 50);
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