linux-kernel - [PATCH v2 08/16] x86/efi: Carrying hibernation key by setup data

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Date:	Tue, 11 Aug 2015 14:16:28 +0800
From:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-efi@...r.kernel.org, linux-pm@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Josh Boyer <jwboyer@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Matt Fleming <matt.fleming@...el.com>,
	Jiri Kosina <jkosina@...e.cz>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	"Lee, Chun-Yi" <jlee@...e.com>
Subject: [PATCH v2 08/16] x86/efi: Carrying hibernation key by setup data

For forwarding hibernation key from EFI stub to boot kernel, this patch
allocates setup data for carrying hibernation key, size and the status
of efi operating.

Reviewed-by: Jiri Kosina <jkosina@...e.com>
Tested-by: Jiri Kosina <jkosina@...e.com>
Signed-off-by: Lee, Chun-Yi <jlee@...e.com>
---
 arch/x86/boot/compressed/eboot.c      | 26 +++++++++++++++++++++++---
 arch/x86/include/uapi/asm/bootparam.h |  1 +
 2 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index 463aa9b..c838d09 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -1394,18 +1394,22 @@ static void setup_hibernation_keys(struct boot_params *params)
 {
 	unsigned long key_size;
 	unsigned long attributes;
+	struct setup_data *setup_data, *hibernation_setup_data;
 	struct hibernation_keys *keys;
+	unsigned long size = 0;
 	efi_status_t status;
 
 	/* Allocate setup_data to carry keys */
+	size = sizeof(struct setup_data) + sizeof(struct hibernation_keys);
 	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
-				sizeof(struct hibernation_keys), &keys);
+				size, &hibernation_setup_data);
 	if (status != EFI_SUCCESS) {
 		efi_printk(sys_table, "Failed to alloc mem for hibernation keys\n");
 		return;
 	}
 
-	memset(keys, 0, sizeof(struct hibernation_keys));
+	memset(hibernation_setup_data, 0, size);
+	keys = (struct hibernation_keys *) hibernation_setup_data->data;
 
 	status = efi_call_early(get_variable, HIBERNATION_KEY,
 				&EFI_HIBERNATION_GUID, &attributes,
@@ -1419,7 +1423,8 @@ static void setup_hibernation_keys(struct boot_params *params)
 		if (status == EFI_SUCCESS) {
 			efi_printk(sys_table, "Cleaned existing hibernation key\n");
 			status = EFI_NOT_FOUND;
-		}
+		} else
+			goto clean_fail;
 	}
 
 	if (status != EFI_SUCCESS) {
@@ -1436,6 +1441,21 @@ static void setup_hibernation_keys(struct boot_params *params)
 		if (status != EFI_SUCCESS)
 			efi_printk(sys_table, "Failed to set hibernation key\n");
 	}
+
+clean_fail:
+	hibernation_setup_data->type = SETUP_HIBERNATION_KEYS;
+	hibernation_setup_data->len = sizeof(struct hibernation_keys);
+	hibernation_setup_data->next = 0;
+	keys->hkey_status = efi_status_to_err(status);
+
+	setup_data = (struct setup_data *)params->hdr.setup_data;
+	while (setup_data && setup_data->next)
+		setup_data = (struct setup_data *)setup_data->next;
+
+	if (setup_data)
+		setup_data->next = (unsigned long)hibernation_setup_data;
+	else
+		params->hdr.setup_data = (unsigned long)hibernation_setup_data;
 }
 #else
 static void setup_hibernation_keys(struct boot_params *params) {}
diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h
index ab456dc..8c88bc2 100644
--- a/arch/x86/include/uapi/asm/bootparam.h
+++ b/arch/x86/include/uapi/asm/bootparam.h
@@ -7,6 +7,7 @@
 #define SETUP_DTB			2
 #define SETUP_PCI			3
 #define SETUP_EFI			4
+#define SETUP_HIBERNATION_KEYS		5
 
 /* ram_size flags */
 #define RAMDISK_IMAGE_START_MASK	0x07FF
-- 
2.1.4

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