[U-Boot] [PATCH v4 02/18] efi_loader: implement SetWatchdogTimer
Heinrich Schuchardt
xypron.glpk at gmx.de
Wed Oct 18 16:13:04 UTC 2017
The watchdog is initialized with a 5 minute timeout period.
It can be reset by SetWatchdogTimer.
It is stopped by ExitBoottimeServices.
Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
v4
no change
v3
add a constant for 1s to 100ns conversion
v2
code comments updated
---
cmd/bootefi.c | 1 +
include/efi_loader.h | 4 ++
lib/efi_loader/Makefile | 2 +-
lib/efi_loader/efi_boottime.c | 17 ++-------
lib/efi_loader/efi_watchdog.c | 89 +++++++++++++++++++++++++++++++++++++++++++
5 files changed, 98 insertions(+), 15 deletions(-)
create mode 100644 lib/efi_loader/efi_watchdog.c
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 478bc116e2..18176a1266 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -43,6 +43,7 @@ static void efi_init_obj_list(void)
#ifdef CONFIG_GENERATE_SMBIOS_TABLE
efi_smbios_register();
#endif
+ efi_watchdog_register();
/* Initialize EFI runtime services */
efi_reset_system_init();
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 1b92edbd77..af64b11cee 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -163,6 +163,8 @@ int efi_disk_register(void);
int efi_gop_register(void);
/* Called by bootefi to make the network interface available */
int efi_net_register(void);
+/* Called by bootefi to make the watchdog available */
+int efi_watchdog_register(void);
/* Called by bootefi to make SMBIOS tables available */
void efi_smbios_register(void);
@@ -171,6 +173,8 @@ efi_fs_from_path(struct efi_device_path *fp);
/* Called by networking code to memorize the dhcp ack package */
void efi_net_set_dhcp_ack(void *pkt, int len);
+/* Called by efi_set_watchdog_timer to reset the timer */
+efi_status_t efi_set_watchdog(unsigned long timeout);
/* Called from places to check whether a timer expired */
void efi_timer_check(void);
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index ddb978f650..83d879b686 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -17,7 +17,7 @@ endif
obj-$(CONFIG_CMD_BOOTEFI_HELLO) += helloworld_efi.o
obj-y += efi_image_loader.o efi_boottime.o efi_runtime.o efi_console.o
obj-y += efi_memory.o efi_device_path_to_text.o efi_device_path.o
-obj-y += efi_file.o efi_variable.o efi_bootmgr.o
+obj-y += efi_file.o efi_variable.o efi_bootmgr.o efi_watchdog.o
obj-$(CONFIG_LCD) += efi_gop.o
obj-$(CONFIG_DM_VIDEO) += efi_gop.o
obj-$(CONFIG_PARTITIONS) += efi_disk.o
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 30577f717e..fd8d15655b 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -155,18 +155,6 @@ void efi_signal_event(struct efi_event *event)
event->is_queued = false;
}
-/*
- * Write a debug message for an EPI API service that is not implemented yet.
- *
- * @funcname function that is not yet implemented
- * @return EFI_UNSUPPORTED
- */
-static efi_status_t efi_unsupported(const char *funcname)
-{
- debug("EFI: App called into unimplemented function %s\n", funcname);
- return EFI_EXIT(EFI_UNSUPPORTED);
-}
-
/*
* Raise the task priority level.
*
@@ -1454,6 +1442,7 @@ static efi_status_t EFIAPI efi_exit_boot_services(void *image_handle,
bootm_disable_interrupts();
/* Give the payload some time to boot */
+ efi_set_watchdog(0);
WATCHDOG_RESET();
return EFI_EXIT(EFI_SUCCESS);
@@ -1497,7 +1486,7 @@ static efi_status_t EFIAPI efi_stall(unsigned long microseconds)
/*
* Reset the watchdog timer.
*
- * This function implements the WatchdogTimer service.
+ * This function implements the SetWatchdogTimer service.
* See the Unified Extensible Firmware Interface (UEFI) specification
* for details.
*
@@ -1514,7 +1503,7 @@ static efi_status_t EFIAPI efi_set_watchdog_timer(unsigned long timeout,
{
EFI_ENTRY("%ld, 0x%"PRIx64", %ld, %p", timeout, watchdog_code,
data_size, watchdog_data);
- return efi_unsupported(__func__);
+ return EFI_EXIT(efi_set_watchdog(timeout));
}
/*
diff --git a/lib/efi_loader/efi_watchdog.c b/lib/efi_loader/efi_watchdog.c
new file mode 100644
index 0000000000..35a45dedf8
--- /dev/null
+++ b/lib/efi_loader/efi_watchdog.c
@@ -0,0 +1,89 @@
+/*
+ * EFI watchdog
+ *
+ * Copyright (c) 2017 Heinrich Schuchardt
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <efi_loader.h>
+
+/* Conversion factor from seconds to multiples of 100ns */
+#define EFI_SECONDS_TO_100NS 10000000ULL
+
+static struct efi_event *watchdog_timer_event;
+
+/*
+ * Reset the system when the watchdog event is notified.
+ *
+ * @event: the watchdog event
+ * @context: not used
+ */
+static void EFIAPI efi_watchdog_timer_notify(struct efi_event *event,
+ void *context)
+{
+ EFI_ENTRY("%p, %p", event, context);
+
+ printf("\nEFI: Watchdog timeout\n");
+ EFI_CALL_VOID(efi_runtime_services.reset_system(EFI_RESET_COLD,
+ EFI_SUCCESS, 0, NULL));
+
+ EFI_EXIT(EFI_UNSUPPORTED);
+}
+
+/*
+ * Reset the watchdog timer.
+ *
+ * This function is used by the SetWatchdogTimer service.
+ *
+ * @timeout: seconds before reset by watchdog
+ * @return: status code
+ */
+efi_status_t efi_set_watchdog(unsigned long timeout)
+{
+ efi_status_t r;
+
+ if (timeout)
+ /* Reset watchdog */
+ r = efi_set_timer(watchdog_timer_event, EFI_TIMER_RELATIVE,
+ EFI_SECONDS_TO_100NS * timeout);
+ else
+ /* Deactivate watchdog */
+ r = efi_set_timer(watchdog_timer_event, EFI_TIMER_STOP, 0);
+ return r;
+}
+
+/*
+ * Initialize the EFI watchdog.
+ *
+ * This function is called by efi_init_obj_list()
+ */
+int efi_watchdog_register(void)
+{
+ efi_status_t r;
+
+ /*
+ * Create a timer event.
+ */
+ r = efi_create_event(EVT_TIMER | EVT_NOTIFY_SIGNAL, TPL_CALLBACK,
+ efi_watchdog_timer_notify, NULL,
+ &watchdog_timer_event);
+ if (r != EFI_SUCCESS) {
+ printf("ERROR: Failed to register watchdog event\n");
+ return r;
+ }
+ /*
+ * The UEFI standard requires that the watchdog timer is set to five
+ * minutes when invoking an EFI boot option.
+ *
+ * Unified Extensible Firmware Interface (UEFI), version 2.7 Errata A
+ * 7.5. Miscellaneous Boot Services - EFI_BOOT_SERVICES.SetWatchdogTimer
+ */
+ r = efi_set_watchdog(300);
+ if (r != EFI_SUCCESS) {
+ printf("ERROR: Failed to set watchdog timer\n");
+ return r;
+ }
+ return 0;
+}
--
2.14.2
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