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Message-Id: <1385408226-22369-1-git-send-email-olof@lixom.net>
Date: Mon, 25 Nov 2013 11:37:06 -0800
From: Olof Johansson <olof@...om.net>
To: linux-kernel@...r.kernel.org
Cc: keescook@...omium.org, bleung@...omium.org,
Olof Johansson <olof@...om.net>
Subject: [PATCH] platform/chrome: Add pstore platform_device
Add the ramoops pstore device so that we get logs of panics across reboots.
Signed-off-by: Olof Johansson <olof@...om.net>
---
drivers/platform/chrome/Kconfig | 14 +++++
drivers/platform/chrome/Makefile | 1 +
drivers/platform/chrome/chromeos_pstore.c | 101 ++++++++++++++++++++++++++++++
3 files changed, 116 insertions(+)
create mode 100644 drivers/platform/chrome/chromeos_pstore.c
diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
index b13303e75a34..06c53c8132ad 100644
--- a/drivers/platform/chrome/Kconfig
+++ b/drivers/platform/chrome/Kconfig
@@ -25,4 +25,18 @@ config CHROMEOS_LAPTOP
If you have a supported Chromebook, choose Y or M here.
The module will be called chromeos_laptop.
+config CHROMEOS_PSTORE
+ tristate "Chrome OS pstore support"
+ ---help---
+ This module instantiates the persistent storage on x86 ChromeOS
+ devices. It can be used to store away console logs and crash
+ information across reboots.
+
+ The range of memory used is 0xf00000-0x1000000, tradionally the
+ memory used to back VGA controller memory.
+
+ If you have a supported Chromebook, choose Y or M here.
+ The module will be called chromeos_pstore.
+
+
endif # CHROMEOS_PLATFORMS
diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
index 015e9195e226..2b860ca7450f 100644
--- a/drivers/platform/chrome/Makefile
+++ b/drivers/platform/chrome/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o
+obj-$(CONFIG_CHROMEOS_PSTORE) += chromeos_pstore.o
diff --git a/drivers/platform/chrome/chromeos_pstore.c b/drivers/platform/chrome/chromeos_pstore.c
new file mode 100644
index 000000000000..e0e0e65cf442
--- /dev/null
+++ b/drivers/platform/chrome/chromeos_pstore.c
@@ -0,0 +1,101 @@
+/*
+ * chromeos_pstore.c - Driver to instantiate Chromebook ramoops device
+ *
+ * Copyright (C) 2013 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ */
+
+#include <linux/dmi.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pstore_ram.h>
+
+static struct dmi_system_id chromeos_pstore_dmi_table[] __initdata = {
+ {
+ /*
+ * Today all Chromebooks/boxes ship with GOOGLE as vendor and
+ * coreboot as bios vendor. No other systems with this
+ * combination are known to date.
+ */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
+ DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
+ },
+ },
+ {
+ /*
+ * The first Samsung Chromebox and Chromebook Series 5 550 use
+ * coreboot but with Samsung as the system vendor.
+ */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
+ DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
+ },
+ },
+ {
+ /* x86-alex, the first Samsung Chromebook. */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
+ },
+ },
+ {
+ /* x86-mario, the Cr-48 pilot device from Google. */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "IEC"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
+ },
+ },
+ {
+ /* x86-zgb, the first Acer Chromebook. */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
+ },
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(dmi, chromeos_pstore_dmi_table);
+
+/*
+ * On x86 chromebooks/boxes, the firmware will keep the legacy VGA memory
+ * range untouched across reboots, so we use that to store our pstore
+ * contents for panic logs, etc.
+ */
+static struct ramoops_platform_data chromeos_ramoops_data = {
+ .mem_size = 0x100000,
+ .mem_address = 0xf00000,
+ .record_size = 0x20000,
+ .console_size = 0x20000,
+ .ftrace_size = 0x20000,
+ .dump_oops = 1,
+};
+
+static struct platform_device chromeos_ramoops = {
+ .name = "ramoops",
+ .dev = {
+ .platform_data = &chromeos_ramoops_data,
+ },
+};
+
+static int __init chromeos_pstore_init(void)
+{
+ if (dmi_check_system(chromeos_pstore_dmi_table))
+ return platform_device_register(&chromeos_ramoops);
+
+ return -ENODEV;
+}
+
+static void __exit chromeos_pstore_exit(void)
+{
+ platform_device_unregister(&chromeos_ramoops);
+}
+
+module_init(chromeos_pstore_init);
+module_exit(chromeos_pstore_exit);
+
+MODULE_DESCRIPTION("Chrome OS pstore module");
+MODULE_LICENSE("GPL");
--
1.8.4.1.601.g02b3b1d
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