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// SPDX-License-Identifier: GPL-2.0+
/*
* Events provide a general-purpose way to react to / subscribe to changes
* within U-Boot
*
* Copyright 2021 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#define LOG_CATEGORY LOGC_EVENT
#include <common.h>
#include <event.h>
#include <event_internal.h>
#include <log.h>
#include <linker_lists.h>
#include <malloc.h>
#include <asm/global_data.h>
#include <linux/list.h>
#include <relocate.h>
DECLARE_GLOBAL_DATA_PTR;
#if CONFIG_IS_ENABLED(EVENT_DEBUG)
const char *const type_name[] = {
"none",
"test",
/* Events related to driver model */
"dm_post_init",
"dm_pre_probe",
"dm_post_probe",
"dm_pre_remove",
"dm_post_remove",
/* init hooks */
"misc_init_f",
/* fdt hooks */
"ft_fixup",
/* main loop events */
"main_loop",
};
_Static_assert(ARRAY_SIZE(type_name) == EVT_COUNT, "event type_name size");
#endif
static const char *event_type_name(enum event_t type)
{
#if CONFIG_IS_ENABLED(EVENT_DEBUG)
return type_name[type];
#else
return "(unknown)";
#endif
}
static int notify_static(struct event *ev)
{
struct evspy_info *start =
ll_entry_start(struct evspy_info, evspy_info);
const int n_ents = ll_entry_count(struct evspy_info, evspy_info);
struct evspy_info *spy;
for (spy = start; spy != start + n_ents; spy++) {
if (spy->type == ev->type) {
int ret;
log_debug("Sending event %x/%s to spy '%s'\n", ev->type,
event_type_name(ev->type), event_spy_id(spy));
ret = spy->func(NULL, ev);
/*
* TODO: Handle various return codes to
*
* - claim an event (no others will see it)
* - return an error from the event
*/
if (ret)
return log_msg_ret("spy", ret);
}
}
return 0;
}
static int notify_dynamic(struct event *ev)
{
struct event_state *state = gd_event_state();
struct event_spy *spy, *next;
list_for_each_entry_safe(spy, next, &state->spy_head, sibling_node) {
if (spy->type == ev->type) {
int ret;
log_debug("Sending event %x/%s to spy '%s'\n", ev->type,
event_type_name(ev->type), spy->id);
ret = spy->func(spy->ctx, ev);
/*
* TODO: Handle various return codes to
*
* - claim an event (no others will see it)
* - return an error from the event
*/
if (ret)
return log_msg_ret("spy", ret);
}
}
return 0;
}
int event_notify(enum event_t type, void *data, int size)
{
struct event event;
int ret;
event.type = type;
if (size > sizeof(event.data))
return log_msg_ret("size", -E2BIG);
memcpy(&event.data, data, size);
ret = notify_static(&event);
if (ret)
return log_msg_ret("sta", ret);
if (CONFIG_IS_ENABLED(EVENT_DYNAMIC)) {
ret = notify_dynamic(&event);
if (ret)
return log_msg_ret("dyn", ret);
}
return 0;
}
int event_notify_null(enum event_t type)
{
return event_notify(type, NULL, 0);
}
void event_show_spy_list(void)
{
struct evspy_info *start =
ll_entry_start(struct evspy_info, evspy_info);
const int n_ents = ll_entry_count(struct evspy_info, evspy_info);
struct evspy_info *spy;
const int size = sizeof(ulong) * 2;
printf("Seq %-24s %*s %s\n", "Type", size, "Function", "ID");
for (spy = start; spy != start + n_ents; spy++) {
printf("%3x %-3x %-20s %*p %s\n", (uint)(spy - start),
spy->type, event_type_name(spy->type), size, spy->func,
event_spy_id(spy));
}
}
#if IS_ENABLED(CONFIG_NEEDS_MANUAL_RELOC)
int event_manual_reloc(void)
{
struct evspy_info *spy, *end;
spy = ll_entry_start(struct evspy_info, evspy_info);
end = ll_entry_end(struct evspy_info, evspy_info);
for (; spy < end; spy++)
MANUAL_RELOC(spy->func);
return 0;
}
#endif
#if CONFIG_IS_ENABLED(EVENT_DYNAMIC)
static void spy_free(struct event_spy *spy)
{
list_del(&spy->sibling_node);
}
int event_register(const char *id, enum event_t type, event_handler_t func, void *ctx)
{
struct event_state *state = gd_event_state();
struct event_spy *spy;
spy = malloc(sizeof(*spy));
if (!spy)
return log_msg_ret("alloc", -ENOMEM);
spy->id = id;
spy->type = type;
spy->func = func;
spy->ctx = ctx;
list_add_tail(&spy->sibling_node, &state->spy_head);
return 0;
}
int event_uninit(void)
{
struct event_state *state = gd_event_state();
struct event_spy *spy, *next;
list_for_each_entry_safe(spy, next, &state->spy_head, sibling_node)
spy_free(spy);
return 0;
}
int event_init(void)
{
struct event_state *state = gd_event_state();
INIT_LIST_HEAD(&state->spy_head);
return 0;
}
#endif /* EVENT_DYNAMIC */
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