From: "Kweh, Hock Leong" <hock.leong.kweh@intel.com>
To: Ming Lei <ming.lei@canonical.com>,
Matt Fleming <matt@console-pimps.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ong Boon Leong <boon.leong.ong@intel.com>,
"Kweh, Hock Leong" <hock.leong.kweh@intel.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-efi@vger.kernel.org,
Sam Protsenko <semen.protsenko@linaro.org>,
Peter Jones <pjones@redhat.com>,
Andy Lutomirski <luto@amacapital.net>,
Roy Franz <roy.franz@linaro.org>, Borislav Petkov <bp@alien8.de>
Subject: [PATCH v4 2/2] efi: an sysfs interface for user to update efi firmware
Date: Tue, 14 Apr 2015 17:44:56 +0800 [thread overview]
Message-ID: <1429004697-28320-3-git-send-email-hock.leong.kweh@intel.com> (raw)
In-Reply-To: <1429004697-28320-1-git-send-email-hock.leong.kweh@intel.com>
From: "Kweh, Hock Leong" <hock.leong.kweh@intel.com>
Introducing a kernel module to expose capsule loader interface
for user to upload capsule binaries. This module leverage the
request_firmware_direct_full_path() to obtain the binary at a
specific path input by user.
Example method to load the capsule binary:
echo -n "/path/to/capsule/binary" > /sys/devices/platform/efi_capsule_loader/capsule_loader
Cc: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Kweh, Hock Leong <hock.leong.kweh@intel.com>
---
drivers/firmware/efi/Kconfig | 12 ++
drivers/firmware/efi/Makefile | 1 +
drivers/firmware/efi/efi-capsule-loader.c | 169 +++++++++++++++++++++++++++++
3 files changed, 182 insertions(+)
create mode 100644 drivers/firmware/efi/efi-capsule-loader.c
diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
index f712d47..3e84ec0 100644
--- a/drivers/firmware/efi/Kconfig
+++ b/drivers/firmware/efi/Kconfig
@@ -60,6 +60,18 @@ config EFI_RUNTIME_WRAPPERS
config EFI_ARMSTUB
bool
+config EFI_CAPSULE_LOADER
+ tristate "EFI capsule loader"
+ depends on EFI
+ select FW_LOADER
+ help
+ This option exposes a loader interface for user to load EFI
+ capsule binary and update the EFI firmware through system reboot.
+ This feature does not support auto locating capsule binaries at the
+ firmware lib search path.
+
+ If unsure, say N.
+
endmenu
config UEFI_CPER
diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile
index 698846e..5ab031a 100644
--- a/drivers/firmware/efi/Makefile
+++ b/drivers/firmware/efi/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_UEFI_CPER) += cper.o
obj-$(CONFIG_EFI_RUNTIME_MAP) += runtime-map.o
obj-$(CONFIG_EFI_RUNTIME_WRAPPERS) += runtime-wrappers.o
obj-$(CONFIG_EFI_STUB) += libstub/
+obj-$(CONFIG_EFI_CAPSULE_LOADER) += efi-capsule-loader.o
diff --git a/drivers/firmware/efi/efi-capsule-loader.c b/drivers/firmware/efi/efi-capsule-loader.c
new file mode 100644
index 0000000..84b979b
--- /dev/null
+++ b/drivers/firmware/efi/efi-capsule-loader.c
@@ -0,0 +1,169 @@
+/*
+ * EFI capsule loader driver.
+ *
+ * Copyright 2015 Intel Corporation
+ *
+ * This file is part of the Linux kernel, and is made available under
+ * the terms of the GNU General Public License version 2.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/highmem.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/efi.h>
+#include <linux/firmware.h>
+
+#define DEV_NAME "efi_capsule_loader"
+
+static DEFINE_MUTEX(capsule_loader_lock);
+static struct platform_device *efi_capsule_pdev;
+
+/*
+ * This function will store the capsule binary and pass it to
+ * efi_capsule_update() API in capsule.c
+ */
+static int efi_capsule_store(const struct firmware *fw)
+{
+ int i;
+ int ret;
+ int count = fw->size;
+ int copy_size = (fw->size > PAGE_SIZE) ? PAGE_SIZE : fw->size;
+ int pages_needed = ALIGN(fw->size, PAGE_SIZE) >> PAGE_SHIFT;
+ struct page **pages;
+ void *page_data;
+ efi_capsule_header_t *capsule = NULL;
+
+ if (!count) {
+ pr_err("%s: Received zero binary size\n", __func__);
+ return -ENOENT;
+ }
+
+ pages = kmalloc_array(pages_needed, sizeof(void *), GFP_KERNEL);
+ if (!pages) {
+ pr_err("%s: kmalloc_array() failed\n", __func__);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < pages_needed; i++) {
+ pages[i] = alloc_page(GFP_KERNEL);
+ if (!pages[i]) {
+ pr_err("%s: alloc_page() failed\n", __func__);
+ --i;
+ ret = -ENOMEM;
+ goto failed;
+ }
+ }
+
+ for (i = 0; i < pages_needed; i++) {
+ page_data = kmap(pages[i]);
+ memcpy(page_data, fw->data + (i * PAGE_SIZE), copy_size);
+
+ if (i == 0)
+ capsule = (efi_capsule_header_t *)page_data;
+ else
+ kunmap(pages[i]);
+
+ count -= copy_size;
+ if (count < PAGE_SIZE)
+ copy_size = count;
+ }
+
+ ret = efi_capsule_update(capsule, pages);
+ if (ret) {
+ pr_err("%s: efi_capsule_update() failed\n", __func__);
+ --i;
+ goto failed;
+ }
+ kunmap(pages[0]);
+
+ /*
+ * we cannot free the pages here due to reboot need that data
+ * maintained.
+ */
+ return 0;
+
+failed:
+ while (i >= 0)
+ __free_page(pages[i--]);
+ kfree(pages);
+ return ret;
+}
+
+static ssize_t capsule_loader_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret = -EBUSY;
+ const struct firmware *fw;
+
+ pr_debug("%s: Received path = %s\n", __func__, buf);
+ if (mutex_trylock(&capsule_loader_lock)) {
+ ret = request_firmware_direct_full_path(&fw, buf,
+ &efi_capsule_pdev->dev);
+ if (ret) {
+ pr_err("%s: request_firmware_direct_full_path() %s\n",
+ __func__,
+ "failed");
+ mutex_unlock(&capsule_loader_lock);
+ return ret;
+ }
+
+ ret = efi_capsule_store(fw);
+ if (ret)
+ pr_err("%s: %s, return error code = %d\n",
+ __func__,
+ "Failed to store capsule binary",
+ ret);
+ release_firmware(fw);
+ mutex_unlock(&capsule_loader_lock);
+ }
+
+ return ret ? ret : count;
+}
+static DEVICE_ATTR_WO(capsule_loader);
+
+static int __init efi_capsule_loader_init(void)
+{
+ int ret = 0;
+
+ efi_capsule_pdev = platform_device_register_simple(DEV_NAME,
+ PLATFORM_DEVID_NONE,
+ NULL, 0);
+ if (IS_ERR(efi_capsule_pdev)) {
+ pr_err("%s: platform_device_register_simple() failed\n",
+ __func__);
+ return PTR_ERR(efi_capsule_pdev);
+ }
+
+ /*
+ * create this file node for user to pass in the full path of the
+ * capsule binary
+ */
+ ret = device_create_file(&efi_capsule_pdev->dev,
+ &dev_attr_capsule_loader);
+ if (ret) {
+ pr_err("%s: device_create_file() failed\n", __func__);
+ platform_device_unregister(efi_capsule_pdev);
+ }
+
+ return ret;
+}
+module_init(efi_capsule_loader_init);
+
+/*
+ * To remove this kernel module, just perform:
+ * rmmod efi_capsule_loader.ko
+ */
+static void __exit efi_capsule_loader_exit(void)
+{
+ platform_device_unregister(efi_capsule_pdev);
+}
+module_exit(efi_capsule_loader_exit);
+
+MODULE_DESCRIPTION("EFI capsule firmware binary loader");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5
next prev parent reply other threads:[~2015-04-14 1:45 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-14 9:44 [PATCH v4 0/2] Enable capsule loader interface for efi firmware updating Kweh, Hock Leong
2015-04-14 9:44 ` [PATCH v4 1/2] firmware_loader: introduce new API - request_firmware_direct_full_path() Kweh, Hock Leong
2015-04-14 14:08 ` Greg Kroah-Hartman
2015-04-14 15:56 ` Andy Lutomirski
2015-04-14 16:18 ` Borislav Petkov
2015-04-15 10:14 ` Matt Fleming
2015-04-15 10:18 ` Borislav Petkov
2015-04-15 11:09 ` Matt Fleming
2015-04-15 13:15 ` Greg Kroah-Hartman
2015-04-15 15:53 ` Andy Lutomirski
2015-04-15 12:48 ` Matt Fleming
2015-04-14 9:44 ` Kweh, Hock Leong [this message]
2015-04-14 14:09 ` [PATCH v4 2/2] efi: an sysfs interface for user to update efi firmware Greg Kroah-Hartman
2015-04-14 15:52 ` Andy Lutomirski
2015-04-15 13:20 ` Greg Kroah-Hartman
2015-04-15 15:45 ` Andy Lutomirski
2015-04-16 0:19 ` Roy Franz
2015-04-17 13:50 ` Greg KH
2015-04-15 11:32 ` Kweh, Hock Leong
2015-04-15 13:19 ` Greg Kroah-Hartman
2015-04-16 9:42 ` Kweh, Hock Leong
2015-04-17 13:49 ` Greg Kroah-Hartman
2015-04-17 14:36 ` Matt Fleming
2015-04-20 3:28 ` Kweh, Hock Leong
2015-04-20 14:43 ` Greg Kroah-Hartman
2015-04-21 3:23 ` Kweh, Hock Leong
2015-04-21 7:56 ` Greg Kroah-Hartman
2015-04-22 1:21 ` James Bottomley
2015-04-22 1:58 ` Andy Lutomirski
2015-04-22 2:20 ` James Bottomley
2015-04-22 3:24 ` Andy Lutomirski
2015-04-22 4:51 ` James Bottomley
2015-04-22 16:50 ` Andy Lutomirski
2015-04-22 17:34 ` James Bottomley
2015-04-22 17:45 ` Andy Lutomirski
2015-04-22 13:27 ` Peter Jones
2015-04-22 15:18 ` James Bottomley
2015-04-22 15:24 ` One Thousand Gnomes
2015-04-23 8:30 ` Kweh, Hock Leong
2015-04-23 14:09 ` James Bottomley
2015-04-24 2:14 ` Kweh, Hock Leong
2015-04-24 15:16 ` James Bottomley
2015-04-27 21:59 ` Andy Lutomirski
2015-04-27 22:35 ` James Bottomley
2015-04-27 22:40 ` Andy Lutomirski
2015-04-27 22:51 ` James Bottomley
2015-04-29 11:23 ` Kweh, Hock Leong
2015-04-29 18:40 ` Andy Lutomirski
2015-04-29 21:37 ` James Bottomley
2015-04-30 9:17 ` Kweh, Hock Leong
2015-04-30 17:55 ` Andy Lutomirski
2015-04-29 21:35 ` James Bottomley
2015-04-29 21:36 ` Andy Lutomirski
2015-04-29 21:39 ` James Bottomley
2015-04-29 21:42 ` Andy Lutomirski
2015-04-20 17:59 ` James Bottomley
2015-04-22 15:35 ` James Bottomley
2015-04-22 15:46 ` Greg Kroah-Hartman
2015-04-22 16:11 ` James Bottomley
2015-04-23 9:50 ` Greg Kroah-Hartman
2015-04-23 16:14 ` James Bottomley
2015-04-23 20:38 ` Greg Kroah-Hartman
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