[3.16.y-ckt stable] Patch "efi/reboot: Add generic wrapper around EfiResetSystem()" has been added to staging queue

Luis Henriques luis.henriques at canonical.com
Tue May 12 10:32:15 UTC 2015


This is a note to let you know that I have just added a patch titled

    efi/reboot: Add generic wrapper around EfiResetSystem()

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt12.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From c4bb687a50aa5021bc1837e1ec6bd1d6062e2cb7 Mon Sep 17 00:00:00 2001
From: Matt Fleming <matt.fleming at intel.com>
Date: Fri, 13 Jun 2014 12:22:22 +0100
Subject: efi/reboot: Add generic wrapper around EfiResetSystem()

commit 8562c99cdd30217dea3609e268572f8764f401a5 upstream.

Implement efi_reboot(), which is really just a wrapper around the
EfiResetSystem() EFI runtime service, but it does at least allow us to
funnel all callers through a single location.

It also simplifies the callsites since users no longer need to check to
see whether EFI_RUNTIME_SERVICES are enabled.

Cc: Tony Luck <tony.luck at intel.com>
Tested-by: Mark Salter <msalter at redhat.com>
Signed-off-by: Matt Fleming <matt.fleming at intel.com>
Cc: Ben Hutchings <ben at decadent.org.uk>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 arch/ia64/kernel/process.c    |  2 +-
 arch/x86/kernel/reboot.c      |  6 +-----
 drivers/firmware/efi/Makefile |  2 +-
 drivers/firmware/efi/reboot.c | 26 ++++++++++++++++++++++++++
 include/linux/efi.h           |  4 ++++
 5 files changed, 33 insertions(+), 7 deletions(-)
 create mode 100644 drivers/firmware/efi/reboot.c

diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index 55d4ba47a907..deed6fa96bb0 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -662,7 +662,7 @@ void
 machine_restart (char *restart_cmd)
 {
 	(void) notify_die(DIE_MACHINE_RESTART, restart_cmd, NULL, 0, 0, 0);
-	(*efi.reset_system)(EFI_RESET_WARM, 0, 0, NULL);
+	efi_reboot(REBOOT_WARM, NULL);
 }

 void
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index f319bfea154e..7c138543c500 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -538,11 +538,7 @@ static void native_machine_emergency_restart(void)
 			break;

 		case BOOT_EFI:
-			if (efi_enabled(EFI_RUNTIME_SERVICES))
-				efi.reset_system(reboot_mode == REBOOT_WARM ?
-						 EFI_RESET_WARM :
-						 EFI_RESET_COLD,
-						 EFI_SUCCESS, 0, NULL);
+			efi_reboot(reboot_mode, NULL);
 			reboot_type = BOOT_BIOS;
 			break;

diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile
index 9553496b0f43..c135154ead89 100644
--- a/drivers/firmware/efi/Makefile
+++ b/drivers/firmware/efi/Makefile
@@ -1,7 +1,7 @@
 #
 # Makefile for linux kernel
 #
-obj-$(CONFIG_EFI)			+= efi.o vars.o
+obj-$(CONFIG_EFI)			+= efi.o vars.o reboot.o
 obj-$(CONFIG_EFI_VARS)			+= efivars.o
 obj-$(CONFIG_EFI_VARS_PSTORE)		+= efi-pstore.o
 obj-$(CONFIG_UEFI_CPER)			+= cper.o
diff --git a/drivers/firmware/efi/reboot.c b/drivers/firmware/efi/reboot.c
new file mode 100644
index 000000000000..81bf925f70f5
--- /dev/null
+++ b/drivers/firmware/efi/reboot.c
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2014 Intel Corporation; author Matt Fleming
+ * Copyright (c) 2014 Red Hat, Inc., Mark Salter <msalter at redhat.com>
+ */
+#include <linux/efi.h>
+#include <linux/reboot.h>
+
+void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
+{
+	int efi_mode;
+
+	if (!efi_enabled(EFI_RUNTIME_SERVICES))
+		return;
+
+	switch (reboot_mode) {
+	case REBOOT_WARM:
+	case REBOOT_SOFT:
+		efi_mode = EFI_RESET_WARM;
+		break;
+	default:
+		efi_mode = EFI_RESET_COLD;
+		break;
+	}
+
+	efi.reset_system(efi_mode, EFI_SUCCESS, 0, NULL);
+}
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 41bbf8ba4ba8..0958d4bb399f 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -20,6 +20,7 @@
 #include <linux/ioport.h>
 #include <linux/pfn.h>
 #include <linux/pstore.h>
+#include <linux/reboot.h>

 #include <asm/page.h>

@@ -926,11 +927,14 @@ static inline bool efi_enabled(int feature)
 {
 	return test_bit(feature, &efi.flags) != 0;
 }
+extern void efi_reboot(enum reboot_mode reboot_mode, const char *__unused);
 #else
 static inline bool efi_enabled(int feature)
 {
 	return false;
 }
+static inline void
+efi_reboot(enum reboot_mode reboot_mode, const char *__unused) {}
 #endif

 /*




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