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efi_loader: event signaling in ExitBootServices

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ExitBootServices() has to stop timer related activity before calling the
events of the EFI_EVENT_GROUP_EXIT_BOOT_SERVICES event group. But our
current implementation was stopping all other events.

All events have to observe the task priority level.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-06-07 06:47:01 +02:00
parent dfa306e442
commit 7eaa900e56
5 changed files with 29 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/efi_loader.h
View File

@ -432,7 +432,7 @@ efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type,
uint64_t trigger_time);
/* Call this to signal an event */
void efi_signal_event(struct efi_event *event, bool check_tpl);
void efi_signal_event(struct efi_event *event);
/* open file system: */
struct efi_simple_file_system_protocol *efi_simple_file_system(

42
lib/efi_loader/efi_boottime.c
View File

@ -27,6 +27,9 @@ LIST_HEAD(efi_obj_list);
/* List of all events */
LIST_HEAD(efi_events);
/* Flag to disable timer activity in ExitBootServices() */
static bool timers_enabled = true;
/* List of all events registered by RegisterProtocolNotify() */
LIST_HEAD(efi_register_notify_events);
@ -163,7 +166,6 @@ const char *__efi_nesting_dec(void)
/**
* efi_queue_event() - queue an EFI event
* @event: event to signal
* @check_tpl: check the TPL level
*
* This function queues the notification function of the event for future
* execution.
@ -174,12 +176,12 @@ const char *__efi_nesting_dec(void)
* For the SignalEvent service see efi_signal_event_ext.
*
*/
static void efi_queue_event(struct efi_event *event, bool check_tpl)
static void efi_queue_event(struct efi_event *event)
{
if (event->notify_function) {
event->is_queued = true;
/* Check TPL */
if (check_tpl && efi_tpl >= event->notify_tpl)
if (efi_tpl >= event->notify_tpl)
return;
event->is_queued = false;
EFI_CALL_VOID(event->notify_function(event,
@ -211,7 +213,6 @@ efi_status_t is_valid_tpl(efi_uintn_t tpl)
/**
* efi_signal_event() - signal an EFI event
* @event: event to signal
* @check_tpl: check the TPL level
*
* This function signals an event. If the event belongs to an event group all
* events of the group are signaled. If they are of type EVT_NOTIFY_SIGNAL
@ -219,7 +220,7 @@ efi_status_t is_valid_tpl(efi_uintn_t tpl)
*
* For the SignalEvent service see efi_signal_event_ext.
*/
void efi_signal_event(struct efi_event *event, bool check_tpl)
void efi_signal_event(struct efi_event *event)
{
if (event->is_signaled)
return;
@ -244,12 +245,12 @@ void efi_signal_event(struct efi_event *event, bool check_tpl)
if (!evt->group || guidcmp(evt->group, event->group))
continue;
if (evt->is_queued)
efi_queue_event(evt, check_tpl);
efi_queue_event(evt);
}
} else {
event->is_signaled = true;
if (event->type & EVT_NOTIFY_SIGNAL)
efi_queue_event(event, check_tpl);
efi_queue_event(event);
}
}
@ -736,7 +737,9 @@ void efi_timer_check(void)
list_for_each_entry(evt, &efi_events, link) {
if (evt->is_queued)
efi_queue_event(evt, true);
efi_queue_event(evt);
if (!timers_enabled)
continue;
if (!(evt->type & EVT_TIMER) || now < evt->trigger_next)
continue;
switch (evt->trigger_type) {
@ -750,7 +753,7 @@ void efi_timer_check(void)
continue;
}
evt->is_signaled = false;
efi_signal_event(evt, true);
efi_signal_event(evt);
}
WATCHDOG_RESET();
}
@ -852,7 +855,7 @@ static efi_status_t EFIAPI efi_wait_for_event(efi_uintn_t num_events,
if (!event[i]->type || event[i]->type & EVT_NOTIFY_SIGNAL)
return EFI_EXIT(EFI_INVALID_PARAMETER);
if (!event[i]->is_signaled)
efi_queue_event(event[i], true);
efi_queue_event(event[i]);
}
/* Wait for signal */
@ -896,7 +899,7 @@ static efi_status_t EFIAPI efi_signal_event_ext(struct efi_event *event)
EFI_ENTRY("%p", event);
if (efi_is_event(event) != EFI_SUCCESS)
return EFI_EXIT(EFI_INVALID_PARAMETER);
efi_signal_event(event, true);
efi_signal_event(event);
return EFI_EXIT(EFI_SUCCESS);
}
@ -963,7 +966,7 @@ static efi_status_t EFIAPI efi_check_event(struct efi_event *event)
event->type & EVT_NOTIFY_SIGNAL)
return EFI_EXIT(EFI_INVALID_PARAMETER);
if (!event->is_signaled)
efi_queue_event(event, true);
efi_queue_event(event);
if (event->is_signaled) {
event->is_signaled = false;
return EFI_EXIT(EFI_SUCCESS);
@ -1071,7 +1074,7 @@ efi_status_t efi_add_protocol(const efi_handle_t handle,
notif->handle = handle;
list_add_tail(&notif->link, &event->handles);
event->event->is_signaled = false;
efi_signal_event(event->event, true);
efi_signal_event(event->event);
}
}
@ -1596,7 +1599,7 @@ out:
/* Notify that the configuration table was changed */
list_for_each_entry(evt, &efi_events, link) {
if (evt->group && !guidcmp(evt->group, guid)) {
efi_signal_event(evt, false);
efi_signal_event(evt);
break;
}
}
@ -1902,13 +1905,13 @@ static efi_status_t EFIAPI efi_exit_boot_services(efi_handle_t image_handle,
if (map_key != efi_memory_map_key)
return EFI_INVALID_PARAMETER;
/* Make sure that notification functions are not called anymore */
efi_tpl = TPL_HIGH_LEVEL;
/* Check if ExitBootServices has already been called */
if (!systab.boottime)
return EFI_EXIT(EFI_SUCCESS);
/* Stop all timer related activities */
timers_enabled = false;
/* Add related events to the event group */
list_for_each_entry(evt, &efi_events, link) {
if (evt->type == EVT_SIGNAL_EXIT_BOOT_SERVICES)
@ -1919,11 +1922,14 @@ static efi_status_t EFIAPI efi_exit_boot_services(efi_handle_t image_handle,
if (evt->group &&
!guidcmp(evt->group,
&efi_guid_event_group_exit_boot_services)) {
efi_signal_event(evt, false);
efi_signal_event(evt);
break;
}
}
/* Make sure that notification functions are not called anymore */
efi_tpl = TPL_HIGH_LEVEL;
/* TODO: Should persist EFI variables here */
board_quiesce_devices();

4
lib/efi_loader/efi_console.c
View File

@ -704,7 +704,7 @@ static void efi_cin_check(void)
efi_status_t ret;
if (key_available) {
efi_signal_event(efi_con_in.wait_for_key, true);
efi_signal_event(efi_con_in.wait_for_key);
return;
}
@ -718,7 +718,7 @@ static void efi_cin_check(void)
/* Queue the wait for key event */
if (key_available)
efi_signal_event(efi_con_in.wait_for_key, true);
efi_signal_event(efi_con_in.wait_for_key);
}
}
}

2
lib/efi_loader/efi_memory.c
View File

@ -321,7 +321,7 @@ uint64_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
if (evt->group &&
!guidcmp(evt->group,
&efi_guid_event_group_memory_map_change)) {
efi_signal_event(evt, false);
efi_signal_event(evt);
break;
}
}

2
lib/efi_loader/efi_runtime.c
View File

@ -130,7 +130,7 @@ static void EFIAPI efi_reset_system_boottime(
if (evt->group &&
!guidcmp(evt->group,
&efi_guid_event_group_reset_system)) {
efi_signal_event(evt, false);
efi_signal_event(evt);
break;
}
}