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boot state: run timers on state entry 

When TIMER_QUEUE is configured on call the timer callbacks on
entry into a state but before its entry callbacks. In addition
provide a barrier to the following states so that timers are drained
before proceeding. This allows for blocking state traversal for key
components of boot.
	BS_OS_RESUME
	BS_WRITE_TABLES
	BS_PAYLOAD_LOAD
	BS_PAYLOAD_BOOT

Future functionality consists of evaluating the timer callbacks within
the device tree. One example is dev_initialize() as that seems state
seems to take 90% of the boot time. The timer callbacks could then be
ran in a more granular manner.

Change-Id: Idb549ea17c5ec38eb57b4f6f366a1c2183f4a6dd
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/3159
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Aaron Durbin 2013-04-29 23:22:01 -05:00 committed by Ronald G. Minnich
parent 340ca91f18
commit 8fc41e1b84
1 changed files with 34 additions and 14 deletions
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48
src/lib/hardwaremain.c
View File

@ -78,23 +78,27 @@ struct boot_state {
struct boot_state_callback *seq_callbacks[2];
boot_state_t (*run_state)(void *arg);
void *arg;
int complete;
int complete : 1;
int timers_drain : 1;
#if CONFIG_HAVE_MONOTONIC_TIMER
struct boot_state_times times;
#endif
};
#define BS_INIT(state_, run_func_) \
{ \
.name = #state_, \
.id = state_, \
.seq_callbacks = { NULL, NULL },\
.run_state = run_func_, \
.arg = NULL, \
.complete = 0 \
#define BS_INIT(state_, run_func_, drain_timers_) \
{ \
.name = #state_, \
.id = state_, \
.seq_callbacks = { NULL, NULL }, \
.run_state = run_func_, \
.arg = NULL, \
.complete = 0, \
.timers_drain = drain_timers_, \
}
#define BS_INIT_ENTRY(state_, run_func_) \
[state_] = BS_INIT(state_, run_func_)
[state_] = BS_INIT(state_, run_func_, 0)
#define BS_INIT_ENTRY_DRAIN_TIMERS(state_, run_func_) \
[state_] = BS_INIT(state_, run_func_, 1)
static struct boot_state boot_states[] = {
BS_INIT_ENTRY(BS_PRE_DEVICE, bs_pre_device),
@ -105,10 +109,10 @@ static struct boot_state boot_states[] = {
BS_INIT_ENTRY(BS_DEV_INIT, bs_dev_init),
BS_INIT_ENTRY(BS_POST_DEVICE, bs_post_device),
BS_INIT_ENTRY(BS_OS_RESUME_CHECK, bs_os_resume_check),
BS_INIT_ENTRY(BS_OS_RESUME, bs_os_resume),
BS_INIT_ENTRY(BS_WRITE_TABLES, bs_write_tables),
BS_INIT_ENTRY(BS_PAYLOAD_LOAD, bs_payload_load),
BS_INIT_ENTRY(BS_PAYLOAD_BOOT, bs_payload_boot),
BS_INIT_ENTRY_DRAIN_TIMERS(BS_OS_RESUME, bs_os_resume),
BS_INIT_ENTRY_DRAIN_TIMERS(BS_WRITE_TABLES, bs_write_tables),
BS_INIT_ENTRY_DRAIN_TIMERS(BS_PAYLOAD_LOAD, bs_payload_load),
BS_INIT_ENTRY_DRAIN_TIMERS(BS_PAYLOAD_BOOT, bs_payload_boot),
};
static boot_state_t bs_pre_device(void *arg)
@ -278,6 +282,20 @@ static inline void bs_sample_time(struct boot_state *state) {}
static inline void bs_report_time(struct boot_state *state) {}
#endif
#if CONFIG_TIMER_QUEUE
static void bs_run_timers(int drain)
{
/* Drain all timer callbacks until none are left, if directed.
* Otherwise run the timers only once. */
do {
if (!timers_run())
break;
} while (drain);
}
#else
static void bs_run_timers(int drain) {}
#endif
static void bs_call_callbacks(struct boot_state *state,
boot_state_sequence_t seq)
{
@ -313,6 +331,8 @@ static void bs_walk_state_machine(boot_state_t current_state_id)
printk(BS_DEBUG_LVL, "BS: Entering %s state.\n", state->name);
bs_run_timers(state->timers_drain);
bs_sample_time(state);
bs_call_callbacks(state, BS_ON_ENTRY);