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https://github.com/AsahiLinux/u-boot
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467bad5e36
Add an event type EVT_MAIN_LOOP that can be used for registering events that need to be run after the platform has been initialised and before the main_loop function is called. Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
237 lines
5.4 KiB
C
237 lines
5.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Events provide a general-purpose way to react to / subscribe to changes
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* within U-Boot
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*
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* Copyright 2021 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#ifndef __event_h
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#define __event_h
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#include <dm/ofnode_decl.h>
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/**
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* enum event_t - Types of events supported by U-Boot
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*
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* @EVT_DM_PRE_PROBE: Device is about to be probed
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*/
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enum event_t {
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EVT_NONE,
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EVT_TEST,
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/* Events related to driver model */
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EVT_DM_POST_INIT,
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EVT_DM_PRE_PROBE,
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EVT_DM_POST_PROBE,
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EVT_DM_PRE_REMOVE,
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EVT_DM_POST_REMOVE,
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/* Init hooks */
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EVT_MISC_INIT_F,
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/* Device tree fixups before booting */
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EVT_FT_FIXUP,
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/* To be called once, before calling main_loop() */
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EVT_MAIN_LOOP,
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EVT_COUNT
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};
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union event_data {
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/**
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* struct event_data_test - test data
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*
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* @signal: A value to update the state with
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*/
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struct event_data_test {
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int signal;
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} test;
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/**
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* struct event_dm - driver model event
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*
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* @dev: Device this event relates to
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*/
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struct event_dm {
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struct udevice *dev;
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} dm;
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/**
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* struct event_ft_fixup - FDT fixup before booting
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*
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* @tree: tree to update
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* @images: images which are being booted
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*/
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struct event_ft_fixup {
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oftree tree;
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struct bootm_headers *images;
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} ft_fixup;
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};
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/**
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* struct event - an event that can be sent and received
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*
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* @type: Event type
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* @data: Data for this particular event
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*/
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struct event {
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enum event_t type;
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union event_data data;
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};
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/** Function type for event handlers */
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typedef int (*event_handler_t)(void *ctx, struct event *event);
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/**
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* struct evspy_info - information about an event spy
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*
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* @func: Function to call when the event is activated (must be first)
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* @type: Event type
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* @id: Event id string
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*/
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struct evspy_info {
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event_handler_t func;
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enum event_t type;
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#if CONFIG_IS_ENABLED(EVENT_DEBUG)
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const char *id;
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#endif
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};
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/* Declare a new event spy */
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#if CONFIG_IS_ENABLED(EVENT_DEBUG)
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#define _ESPY_REC(_type, _func) { _func, _type, #_func, }
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#else
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#define _ESPY_REC(_type, _func) { _func, _type, }
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#endif
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static inline const char *event_spy_id(struct evspy_info *spy)
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{
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#if CONFIG_IS_ENABLED(EVENT_DEBUG)
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return spy->id;
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#else
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return "?";
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#endif
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}
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/*
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* It seems that LTO will drop list entries if it decides they are not used,
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* although the conditions that cause this are unclear.
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*
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* The example found is the following:
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*
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* static int sandbox_misc_init_f(void *ctx, struct event *event)
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* {
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* return sandbox_early_getopt_check();
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* }
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* EVENT_SPY(EVT_MISC_INIT_F, sandbox_misc_init_f);
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*
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* where EVENT_SPY uses ll_entry_declare()
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*
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* In this case, LTO decides to drop the sandbox_misc_init_f() function
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* (which is fine) but then drops the linker-list entry too. This means
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* that the code no longer works, in this case sandbox no-longer checks its
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* command-line arguments properly.
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*
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* Without LTO, the KEEP() command in the .lds file is enough to keep the
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* entry around. But with LTO it seems that the entry has already been
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* dropped before the link script is considered.
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*
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* The only solution I can think of is to mark linker-list entries as 'used'
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* using an attribute. This should be safe, since we don't actually want to drop
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* any of these. However this does slightly limit LTO's optimisation choices.
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*
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* Another issue has come up, only with clang: using 'static' makes it throw
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* away the linker-list entry sometimes, e.g. with the EVT_FT_FIXUP entry in
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* vbe_simple.c - so for now, make it global.
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*/
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#define EVENT_SPY(_type, _func) \
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__used ll_entry_declare(struct evspy_info, _type ## _3_ ## _func, \
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evspy_info) = _ESPY_REC(_type, _func)
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/**
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* event_register - register a new spy
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*
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* @id: Spy ID
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* @type: Event type to subscribe to
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* @func: Function to call when the event is sent
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* @ctx: Context to pass to the function
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* @return 0 if OK, -ve on error
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*/
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int event_register(const char *id, enum event_t type, event_handler_t func,
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void *ctx);
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/** event_show_spy_list( - Show a list of event spies */
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void event_show_spy_list(void);
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/**
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* event_manual_reloc() - Relocate event handler pointers
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*
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* Relocate event handler pointers for all static event spies. It is called
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* during the generic board init sequence, after relocation.
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*
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* Return: 0 if OK
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*/
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int event_manual_reloc(void);
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/**
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* event_notify() - notify spies about an event
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*
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* It is possible to pass in union event_data here but that may not be
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* convenient if the data is elsewhere, or is one of the members of the union.
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* So this uses a void * for @data, with a separate @size.
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*
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* @type: Event type
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* @data: Event data to be sent (e.g. union_event_data)
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* @size: Size of data in bytes
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* @return 0 if OK, -ve on error
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*/
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int event_notify(enum event_t type, void *data, int size);
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#if CONFIG_IS_ENABLED(EVENT)
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/**
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* event_notify_null() - notify spies about an event
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*
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* Data is NULL and the size is 0
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*
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* @type: Event type
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* @return 0 if OK, -ve on error
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*/
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int event_notify_null(enum event_t type);
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#else
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static inline int event_notify_null(enum event_t type)
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{
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return 0;
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}
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#endif
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#if CONFIG_IS_ENABLED(EVENT_DYNAMIC)
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/**
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* event_uninit() - Clean up dynamic events
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*
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* This removes all dynamic event handlers
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*/
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int event_uninit(void);
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/**
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* event_uninit() - Set up dynamic events
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*
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* Init a list of dynamic event handlers, so that these can be added as
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* needed
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*/
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int event_init(void);
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#else
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static inline int event_uninit(void)
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{
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return 0;
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}
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static inline int event_init(void)
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{
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return 0;
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}
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#endif
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#endif
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