The PFRU (Platform Firmware Runtime Update) kernel interface is designed
to interact with the platform firmware interface defined in the
`Management Mode Firmware Runtime Update
<https://uefi.org/sites/default/files/resources/Intel_MM_OS_Interface_Spec_Rev100.pdf>`
specification. The primary function of PFRU is to carry out runtime
updates of the platform firmware, which doesn't require the system to
be restarted. It also allows telemetry data to be retrieved from the
platform firmware.
=============
- Change from v8 to v9:
- Use GUID_INIT() instead of guid_parse() during boot up.
(Andy Shevchenko)
- Drop uuid, code_uuid, drv_uuid in struct pfru_device as they
are not needed. (Andy Shevchenko)
- Drop type casting from void * in valid_version().
(Andy Shevchenko)
- Use kfree() instead of ACPI_FREE() in non-ACPICA usage.
(Andy Shevchenko)
- Use sizeof(rev) instead of sizeof(u32) in copy_from_user().
(Andy Shevchenko)
- Generate physical address from MSB part to LSB.
(Andy Shevchenko)
- Use devm_add_action_or_reset() to add ida release into dev resource
management. (Andy Shevchenko)
- Use devm_kasprintf() instead of kasprintf() to format the
pfru_dev name.(Andy Shevchenko)
- Remove redundant 0 in acpi_pfru_ids. (Andy Shevchenko)
- Adjust the order of included headers in pfru.h.
(Andy Shevchenko)
- Replace PFRU_MAGIC with PFRU_MAGIC_FOR_IOCTL in uapi file.
(Andy Shevchenko)
Use devm_kasprintf() instead of kasprintf() to format the
pfru_log_dev name.(Andy Shevchenko)
Remove redundant 0 in acpi_pfru_log_ids. (Andy Shevchenko)
- Change from v7 to v8:
- Remove the variable-length array in struct pfru_update_cap_info, and
copy the non-variable-length struct pfru_update_cap_info to userspace
directly. (Greg Kroah-Hartman)
- Use efi_guid_t instead of guid_t when parsing capsule file.
(Andy Shevchenko)
- Change the type of rev_id from int to u32, because this data will
be copied between kernel and userspace. (Greg Kroah-Hartman)
- Add a prefix for dev in struct pfru_device to parent_dev, so as
to indicate that this filed is the parent of the created miscdev.
(Greg Kroah-Hartman)
- Use blank lines between different macro sections. (Greg Kroah-Hartman)
Illusatrate the possible errno for each ioctl interface.
(Greg Kroah-Hartman)
- Remove pfru_valid_revid() from uapi header to avoid poluting the global
namespace.(Greg Kroah-Hartman)
- Assign the value to the enum type explicitly.(Greg Kroah-Hartman)
- Change the guid_t to efi_guid_t when parsing image header in get_image_type()
(Greg Kroah-Hartman)
- Remove the void * to other type casting in valid_version(). (Andy Shevchenko)
- Combined the assignment of variables with definitions. (Andy Shevchenko)
- Define this magic for revision ID. (Andy Shevchenko)
- Make the labeling consistent for error handling. (Andy Shevchenko)
- Replace the UUID_SIZE in uapi with 16 directly. (Andy Shevchenko)
- Add blank line between generic include header and uapi header.
(Andy Shevchenko)
- Arrange the order between devm_kzalloc() and normal allocation in
acpi_pfru_probe() that, the former should always be ahead of the
latter. (Andy Shevchenko)
- Change from v6 to v7:
- Use __packed instead of pragma pack(1).
(Greg Kroah-Hartman, Ard Biesheuve)
- Use ida_alloc() to allocate a ID, and release the ID when
device is removed. (Greg Kroah-Hartman)
- Check the _DSM method at early stage, before allocate or parse
anything in acpi_pfru_[log_]probe(). (Greg Kroah-Hartman)
- Set the parent of the misc device. (Greg Kroah-Hartman)
- Use module_platform_driver() instead of platform_driver_register()
in module_init(). Separate pfru driver and pfru_telemetry driver
to two files. (Greg Kroah-Hartman)
- Change from v5 to v6:
- Use Link: tag to add the specification download address.
(Andy Shevchenko)
- Drop comma for each terminator entry in the enum structure.
(Andy Shevchenko)
- Remove redundant 'else' in get_image_type().
(Andy Shevchenko)
- Directly return results from the switch cases in adjust_efi_size()
and pfru_ioctl().(Andy Shevchenko)
- Keep comment style consistency by removing the period for
one line comment.
(Andy Shevchenko)
- Remove devm_kfree() if .probe() failed.
(Andy Shevchenko)
- Remove linux/uuid.h and use raw buffers to contain uuid.
(Andy Shevchenko)
- Include types.h in pfru.h. (Andy Shevchenko)
- Use __u8[16] instead of uuid_t. (Andy Shevchenko)
- Replace enum in pfru.h with __u32 as enum size is not the
same size on all possible architectures.
(Andy Shevchenko)
- Simplify the userspace tool to use while loop for getopt_long().
(Andy Shevchenko)
- Change from v4 to v5:
- Remove Documentation/ABI/pfru, and move the content to kernel doc
in include/uapi/linux/pfru.h (Greg Kroah-Hartman)
- Shrink the range of ioctl numbers declared in
Documentation/userspace-api/ioctl/ioctl-number.rst
from 16 to 8. (Greg Kroah-Hartman)
- Change global variable struct pfru_device *pfru_dev to
per PFRU device. (Greg Kroah-Hartman)
- Unregister the misc device in acpi_pfru_remove().
(Greg Kroah-Hartman)
- Convert the kzalloc() to devm_kzalloc() in the driver so
as to avoid freeing the memory. (Greg Kroah-Hartman)
- Fix the compile warning by declaring the pfru_log_ioctl() as
static. (kernel test robot LKP)
- Change to global variable misc_device to per PFRU device.
(Greg Kroah-Hartman)
- Remove the telemetry output in commit log. (Greg Kroah-Hartman)
- Add link for corresponding userspace tool in the commit log.
(Greg Kroah-Hartman)
- Replace the telemetry .read() with .mmap() so that the userspace
could mmap once, and read multiple times. (Greg Kroah-Hartman)
- Change from v3 to v4:
- Add Documentation/ABI/testing/pfru to document the ABI and
remove Documentation/x86/pfru.rst (Rafael J. Wysocki)
- Replace all pr_err() with dev_dbg() (Greg Kroah-Hartman,
Rafael J. Wysocki)
- returns ENOTTY rather than ENOIOCTLCMD if invalid ioctl command
is provided. (Greg Kroah-Hartman)
- Remove compat ioctl. (Greg Kroah-Hartman)
- Rename /dev/pfru/pfru_update to /dev/acpi_pfru (Greg Kroah-Hartman)
- Simplify the check for element of the package in query_capability()
(Rafael J. Wysocki)
- Remove the loop in query_capability(), query_buffer() and query
the package elemenet directly. (Rafael J. Wysocki)
- Check the number of elements in case the number of package
elements is too small. (Rafael J. Wysocki)
- Doing the assignment as initialization in get_image_type().
Meanwhile, returns the type or a negative error code in
get_image_type(). (Rafael J. Wysocki)
- Put the comments inside the function. (Rafael J. Wysocki)
- Returns the size or a negative error code in adjust_efi_size()
(Rafael J. Wysocki)
- Fix the return value from EFAULT to EINVAL if pfru_valid_revid()
does not pass. (Rafael J. Wysocki)
- Change the write() to be the code injection/update, the read() to
be telemetry retrieval and all of the rest to be ioctl()s under
one special device file.(Rafael J. Wysocki)
- Remove redundant parens. (Rafael J. Wysocki)
- Putting empty code lines after an if () statement that is not
followed by a block. (Rafael J. Wysocki)
- Remove "goto" tags to make the code more readable. (Rafael J. Wysocki)
- Change from v2 to v3:
- Use valid types for structures that cross the user/kernel boundary
in the uapi header. (Greg Kroah-Hartman)
- Rename the structure in uapi to start with a prefix pfru so as
to avoid confusing in the global namespace. (Greg Kroah-Hartman)
- Change from v1 to v2:
- Add a spot in index.rst so it becomes part of the docs build
(Jonathan Corbet).
- Sticking to the 80-column limit(Jonathan Corbet).
- Underline lengths should match the title text(Jonathan Corbet).
- Use literal blocks for the code samples(Jonathan Corbet).
- Add sanity check for duplicated instance of ACPI device.
- Update the driver to work with allocated pfru_device objects.
(Mike Rapoport)
- For each switch case pair, get rid of the magic case numbers
and add a default clause with the error handling.(Mike Rapoport)
- Move the obj->type checks outside the switch to reduce redundancy.
(Mike Rapoport)
- Parse the code_inj_id and drv_update_id at driver initialization time
to reduce the re-parsing at runtime. (Mike Rapoport)
- Explain in detail how the size needs to be adjusted when doing
version check. (Mike Rapoport)
- Rename parse_update_result() to dump_update_result()
(Mike Rapoport)
- Remove redundant return.(Mike Rapoport)
- Do not expose struct capsulate_buf_info to uapi, since it is
not needed in userspace. (Mike Rapoport)
- Do not allow non-root user to run this test.(Shuah Khan)
- Test runs on platform without pfru_telemetry should skip
instead of reporting failure/error.(Shuah Khan)
- Reuse uapi/linux/pfru.h instead of copying it into the test
directory. (Mike Rapoport)
Chen Yu (4):
efi: Introduce EFI_FIRMWARE_MANAGEMENT_CAPSULE_HEADER and
corresponding structures
drivers/acpi: Introduce Platform Firmware Runtime Update device driver
drivers/acpi: Introduce Platform Firmware Runtime Update Telemetry
tools: Introduce power/acpi/tools/pfru
.../userspace-api/ioctl/ioctl-number.rst | 1 +
drivers/acpi/Kconfig | 1 +
drivers/acpi/Makefile | 1 +
drivers/acpi/pfru/Kconfig | 13 +
drivers/acpi/pfru/Makefile | 2 +
drivers/acpi/pfru/pfru_telemetry.c | 458 ++++++++++++++
drivers/acpi/pfru/pfru_update.c | 598 ++++++++++++++++++
include/linux/efi.h | 46 ++
include/uapi/linux/pfru.h | 262 ++++++++
tools/power/acpi/.gitignore | 1 +
tools/power/acpi/Makefile | 16 +-
tools/power/acpi/Makefile.rules | 2 +-
tools/power/acpi/man/pfru.8 | 137 ++++
tools/power/acpi/tools/pfru/Makefile | 23 +
tools/power/acpi/tools/pfru/pfru.c | 417 ++++++++++++
15 files changed, 1969 insertions(+), 9 deletions(-)
create mode 100644 drivers/acpi/pfru/Kconfig
create mode 100644 drivers/acpi/pfru/Makefile
create mode 100644 drivers/acpi/pfru/pfru_telemetry.c
create mode 100644 drivers/acpi/pfru/pfru_update.c
create mode 100644 include/uapi/linux/pfru.h
create mode 100644 tools/power/acpi/man/pfru.8
create mode 100644 tools/power/acpi/tools/pfru/Makefile
create mode 100644 tools/power/acpi/tools/pfru/pfru.c
--
2.25.1
Introduce the pfru_update driver which can be used for Platform Firmware
Runtime code injection and driver update [1]. The user is expected to
provide the update firmware in the form of capsule file, and pass it to
the driver via ioctl. Then the driver would hand this capsule file to the
Platform Firmware Runtime Update via the ACPI device _DSM method. At last
the low level Management Mode would do the firmware update.
The corresponding userspace tool and man page will be introduced at
tools/power/acpi/tools/pfru.
Link: https://uefi.org/sites/default/files/resources/Intel_MM_OS_Interface_Spec_Rev100.pdf # [1]
Signed-off-by: Chen Yu <[email protected]>
---
v9: Use GUID_INIT() instead of guid_parse() during boot up.
(Andy Shevchenko)
Drop uuid, code_uuid, drv_uuid in struct pfru_device as they
are not needed. (Andy Shevchenko)
Drop type casting from void * in valid_version().
(Andy Shevchenko)
Use kfree() instead of ACPI_FREE() in non-ACPICA usage.
(Andy Shevchenko)
Use sizeof(rev) instead of sizeof(u32) in copy_from_user().
(Andy Shevchenko)
Generate physical address from MSB part to LSB.
(Andy Shevchenko)
Use devm_add_action_or_reset() to add ida release into dev resource
management. (Andy Shevchenko)
Use devm_kasprintf() instead of kasprintf() to format the
pfru_dev name.(Andy Shevchenko)
Remove redundant 0 in acpi_pfru_ids. (Andy Shevchenko)
Adjust the order of included headers in pfru.h.
(Andy Shevchenko)
Replace PFRU_MAGIC with PFRU_MAGIC_FOR_IOCTL in uapi file.
(Andy Shevchenko)
v8: Remove the variable-length array in struct pfru_update_cap_info, and
copy the non-variable-length struct pfru_update_cap_info to userspace
directly. (Greg Kroah-Hartman)
Change the type of rev_id from int to u32, because this data will
be copied between kernel and userspace. (Greg Kroah-Hartman)
Add a prefix for dev in struct pfru_device to parent_dev, so as
to indicate that this filed is the parent of the created miscdev.
(Greg Kroah-Hartman)
Use blank lines between different macro sections. (Greg Kroah-Hartman)
Illusatrate the possible errno for each ioctl interface.
(Greg Kroah-Hartman)
Remove pfru_valid_revid() from uapi header to avoid poluting the global
namespace.(Greg Kroah-Hartman)
Assign the value to the enum type explicitly.(Greg Kroah-Hartman)
Change the guid_t to efi_guid_t when parsing image header in get_image_type()
(Greg Kroah-Hartman)
Remove the void * to other type casting in valid_version(). (Andy Shevchenko)
Combined the assignment of variables with definitions. (Andy Shevchenko)
Define this magic for revision ID. (Andy Shevchenko)
Make the labeling consistent for error handling. (Andy Shevchenko)
Replace the UUID_SIZE in uapi with 16 directly. (Andy Shevchenko)
Add blank line between generic include header and uapi header.
(Andy Shevchenko)
Arrange the order between devm_kzalloc() and normal allocation in
acpi_pfru_probe() that, the former should always be ahead of the
latter. (Andy Shevchenko)
Move the UUID from uapi header to the c file. (Andy Shevchenko)
v7: Use ida_alloc() to allocate a ID, and release the ID when
device is removed. (Greg Kroah-Hartman)
Check the _DSM method at early stage, before allocate or parse
anything in acpi_pfru_probe(). (Greg Kroah-Hartman)
Set the parent of the misc device. (Greg Kroah-Hartman)
Use module_platform_driver() instead of platform_driver_register()
in module_init(). Separate pfru driver and pfru_telemetry driver
to two files. (Greg Kroah-Hartman)
v6: Use Link: tag to add the specification download address.
(Andy Shevchenko)
Remove linux/uuid.h and use raw buffers to contain uuid.
(Andy Shevchenko)
Drop comma for each terminator entry in the enum structure.
(Andy Shevchenko)
Remove redundant 'else' in get_image_type().
(Andy Shevchenko)
Directly return results from the switch cases in adjust_efi_size()
and pfru_ioctl().(Andy Shevchenko)
Keep comment style consistent by removing the period for
one line comment.
(Andy Shevchenko)
Remove devm_kfree() if .probe() failed.
(Andy Shevchenko)
v5: Remove Documentation/ABI/pfru, and move the content to kernel doc
in include/uapi/linux/pfru.h (Greg Kroah-Hartman)
Shrink the range of ioctl numbers declared in
Documentation/userspace-api/ioctl/ioctl-number.rst
from 16 to 8. (Greg Kroah-Hartman)
Change global variable struct pfru_device *pfru_dev to
per ACPI device. (Greg Kroah-Hartman)
Unregister the misc device in acpi_pfru_remove().
(Greg Kroah-Hartman)
Convert the kzalloc() to devm_kzalloc() in the driver so
as to avoid freeing the memory. (Greg Kroah-Hartman)
Fix the compile error by declaring the pfru_log_ioctl() as
static. (kernel test robot LKP)
Change to global variable misc_device to per ACPI device.
(Greg Kroah-Hartman)
v4: Replace all pr_err() with dev_dbg() (Greg Kroah-Hartman,
Rafael J. Wysocki)
Returns ENOTTY rather than ENOIOCTLCMD if invalid ioctl command
is provided. (Greg Kroah-Hartman)
Remove compat ioctl. (Greg Kroah-Hartman)
Rename /dev/pfru/pfru_update to /dev/acpi_pfru (Greg Kroah-Hartman)
Simplify the check for element of the package in query_capability()
(Rafael J. Wysocki)
Remove the loop in query_capability(), query_buffer() and query
the package elemenet directly. (Rafael J. Wysocki)
Check the the number of elements in case the number of package
elements is too small. (Rafael J. Wysocki)
Doing the assignment as initialization in get_image_type().
Meanwhile, returns the type or a negative error code in
get_image_type(). (Rafael J. Wysocki)
Put the comments inside the function. (Rafael J. Wysocki)
Returns the size or a negative error code in adjust_efi_size()
(Rafael J. Wysocki)
Fix the return value from EFAULT to EINVAL if pfru_valid_revid()
does not pass. (Rafael J. Wysocki)
Change the write() to be the code injection/update, the read() to
be telemetry retrieval and all of the rest to be ioctl()s under
one special device file.(Rafael J. Wysocki)
Putting empty code lines after an if () statement that is not
followed by a block. (Rafael J. Wysocki)
Remove "goto" tags to make the code more readable. (Rafael J. Wysocki)
v3: Use __u32 instead of int and __64 instead of unsigned long
in include/uapi/linux/pfru.h (Greg Kroah-Hartman)
Rename the structure in uapi to start with a prefix pfru so as
to avoid confusing in the global namespace. (Greg Kroah-Hartman)
v2: Add sanity check for duplicated instance of ACPI device.
Update the driver to work with allocated pfru_device objects.
(Mike Rapoport)
For each switch case pair, get rid of the magic case numbers
and add a default clause with the error handling.
(Mike Rapoport)
Move the obj->type checks outside the switch to reduce redundancy.
(Mike Rapoport)
Parse the code_inj_id and drv_update_id at driver initialization time
to reduce the re-parsing at runtime.(Mike Rapoport)
Explain in detail how the size needs to be adjusted when doing
version check.(Mike Rapoport)
Rename parse_update_result() to dump_update_result()(Mike Rapoport)
Remove redundant return.(Mike Rapoport)
Do not expose struct capsulate_buf_info to uapi, since it is
not needed in userspace.(Mike Rapoport)
---
.../userspace-api/ioctl/ioctl-number.rst | 1 +
drivers/acpi/Kconfig | 1 +
drivers/acpi/Makefile | 1 +
drivers/acpi/pfru/Kconfig | 13 +
drivers/acpi/pfru/Makefile | 2 +
drivers/acpi/pfru/pfru_update.c | 598 ++++++++++++++++++
include/uapi/linux/pfru.h | 174 +++++
7 files changed, 790 insertions(+)
create mode 100644 drivers/acpi/pfru/Kconfig
create mode 100644 drivers/acpi/pfru/Makefile
create mode 100644 drivers/acpi/pfru/pfru_update.c
create mode 100644 include/uapi/linux/pfru.h
diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst
index 6655d929a351..809ac9e6f011 100644
--- a/Documentation/userspace-api/ioctl/ioctl-number.rst
+++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
@@ -366,6 +366,7 @@ Code Seq# Include File Comments
<mailto:[email protected]>
0xE5 00-3F linux/fuse.h
0xEC 00-01 drivers/platform/chrome/cros_ec_dev.h ChromeOS EC driver
+0xEE 00-09 uapi/linux/pfru.h Platform Firmware Runtime Update and Telemetry
0xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
<mailto:[email protected]>
0xF6 all LTTng Linux Trace Toolkit Next Generation
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 1da360c51d66..1d8d2e2cefac 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -482,6 +482,7 @@ source "drivers/acpi/nfit/Kconfig"
source "drivers/acpi/numa/Kconfig"
source "drivers/acpi/apei/Kconfig"
source "drivers/acpi/dptf/Kconfig"
+source "drivers/acpi/pfru/Kconfig"
config ACPI_WATCHDOG
bool
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 3018714e87d9..9c2c5ddff6ec 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -102,6 +102,7 @@ obj-$(CONFIG_ACPI_CPPC_LIB) += cppc_acpi.o
obj-$(CONFIG_ACPI_SPCR_TABLE) += spcr.o
obj-$(CONFIG_ACPI_DEBUGGER_USER) += acpi_dbg.o
obj-$(CONFIG_ACPI_PPTT) += pptt.o
+obj-$(CONFIG_ACPI_PFRU) += pfru/
# processor has its own "processor." module_param namespace
processor-y := processor_driver.o
diff --git a/drivers/acpi/pfru/Kconfig b/drivers/acpi/pfru/Kconfig
new file mode 100644
index 000000000000..fd0a41b88fac
--- /dev/null
+++ b/drivers/acpi/pfru/Kconfig
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0
+config ACPI_PFRU
+ tristate "ACPI Platform Firmware Runtime Update (PFRU)"
+ depends on 64BIT
+ help
+ In order to reduce the system reboot times and update the platform firmware
+ in time, Platform Firmware Runtime Update is leveraged to patch the system
+ without reboot. This driver supports Platform Firmware Runtime Update,
+ which is composed of two parts: code injection and driver update. It also
+ allows telemetry data to be retrieved from the platform firmware.
+
+ To compile this driver as module, choose M here:
+ the modules will be called pfru_update and pfru_telemetry.
diff --git a/drivers/acpi/pfru/Makefile b/drivers/acpi/pfru/Makefile
new file mode 100644
index 000000000000..098cbe80cf3d
--- /dev/null
+++ b/drivers/acpi/pfru/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_ACPI_PFRU) += pfru_update.o
diff --git a/drivers/acpi/pfru/pfru_update.c b/drivers/acpi/pfru/pfru_update.c
new file mode 100644
index 000000000000..186b3b9cb321
--- /dev/null
+++ b/drivers/acpi/pfru/pfru_update.c
@@ -0,0 +1,598 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ACPI Platform Firmware Runtime Update Device Driver
+ *
+ * Copyright (C) 2021 Intel Corporation
+ * Author: Chen Yu <[email protected]>
+ */
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/efi.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/idr.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/string.h>
+#include <linux/uaccess.h>
+#include <linux/uio.h>
+#include <linux/uuid.h>
+
+#include <uapi/linux/pfru.h>
+
+#define PFRU_FUNC_STANDARD_QUERY 0
+#define PFRU_FUNC_QUERY_UPDATE_CAP 1
+#define PFRU_FUNC_QUERY_BUF 2
+#define PFRU_FUNC_START 3
+
+#define PFRU_CODE_INJECT_TYPE 1
+#define PFRU_DRIVER_UPDATE_TYPE 2
+
+#define PFRU_REVID_1 1
+#define PFRU_REVID_2 2
+#define PFRU_DEFAULT_REV_ID PFRU_REVID_1
+
+enum cap_index {
+ CAP_STATUS_IDX = 0,
+ CAP_UPDATE_IDX = 1,
+ CAP_CODE_TYPE_IDX = 2,
+ CAP_FW_VER_IDX = 3,
+ CAP_CODE_RT_VER_IDX = 4,
+ CAP_DRV_TYPE_IDX = 5,
+ CAP_DRV_RT_VER_IDX = 6,
+ CAP_DRV_SVN_IDX = 7,
+ CAP_PLAT_ID_IDX = 8,
+ CAP_OEM_ID_IDX = 9,
+ CAP_OEM_INFO_IDX = 10,
+ CAP_NR_IDX = 11
+};
+
+enum buf_index {
+ BUF_STATUS_IDX = 0,
+ BUF_EXT_STATUS_IDX = 1,
+ BUF_ADDR_LOW_IDX = 2,
+ BUF_ADDR_HI_IDX = 3,
+ BUF_SIZE_IDX = 4,
+ BUF_NR_IDX = 5
+};
+
+enum update_index {
+ UPDATE_STATUS_IDX = 0,
+ UPDATE_EXT_STATUS_IDX = 1,
+ UPDATE_AUTH_TIME_LOW_IDX = 2,
+ UPDATE_AUTH_TIME_HI_IDX = 3,
+ UPDATE_EXEC_TIME_LOW_IDX = 4,
+ UPDATE_EXEC_TIME_HI_IDX = 5,
+ UPDATE_NR_IDX = 6
+};
+
+enum pfru_start_action {
+ START_STAGE = 0,
+ START_ACTIVATE = 1,
+ START_STAGE_ACTIVATE = 2,
+};
+
+struct pfru_device {
+ u32 rev_id, index;
+ struct device *parent_dev;
+ struct miscdevice miscdev;
+};
+
+static DEFINE_IDA(pfru_ida);
+
+static const guid_t pfru_guid =
+ GUID_INIT(0xECF9533B, 0x4A3C, 0x4E89, 0x93, 0x9E, 0xC7, 0x71,
+ 0x12, 0x60, 0x1C, 0x6D);
+
+static const guid_t pfru_code_inj_guid =
+ GUID_INIT(0xB2F84B79, 0x7B6E, 0x4E45, 0x88, 0x5F, 0x3F, 0xB9,
+ 0xBB, 0x18, 0x54, 0x02);
+
+static const guid_t pfru_drv_update_guid =
+ GUID_INIT(0x4569DD8C, 0x75F1, 0x429A, 0xA3, 0xD6, 0x24, 0xDE,
+ 0x80, 0x97, 0xA0, 0xDF);
+
+static inline int pfru_valid_revid(u32 id)
+{
+ return id == PFRU_REVID_1 || id == PFRU_REVID_2;
+}
+
+static inline struct pfru_device *to_pfru_dev(struct file *file)
+{
+ return container_of(file->private_data, struct pfru_device, miscdev);
+}
+
+static int query_capability(struct pfru_update_cap_info *cap_hdr,
+ struct pfru_device *pfru_dev)
+{
+ acpi_handle handle = ACPI_HANDLE(pfru_dev->parent_dev);
+ union acpi_object *out_obj;
+ int ret = -EINVAL;
+
+ out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
+ pfru_dev->rev_id,
+ PFRU_FUNC_QUERY_UPDATE_CAP,
+ NULL, ACPI_TYPE_PACKAGE);
+ if (!out_obj)
+ return ret;
+
+ if (out_obj->package.count < CAP_NR_IDX)
+ goto free_acpi_buffer;
+
+ if (out_obj->package.elements[CAP_STATUS_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ cap_hdr->status = out_obj->package.elements[CAP_STATUS_IDX].integer.value;
+
+ if (out_obj->package.elements[CAP_UPDATE_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ cap_hdr->update_cap = out_obj->package.elements[CAP_UPDATE_IDX].integer.value;
+
+ if (out_obj->package.elements[CAP_CODE_TYPE_IDX].type != ACPI_TYPE_BUFFER)
+ goto free_acpi_buffer;
+
+ memcpy(&cap_hdr->code_type,
+ out_obj->package.elements[CAP_CODE_TYPE_IDX].buffer.pointer,
+ out_obj->package.elements[CAP_CODE_TYPE_IDX].buffer.length);
+
+ if (out_obj->package.elements[CAP_FW_VER_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ cap_hdr->fw_version =
+ out_obj->package.elements[CAP_FW_VER_IDX].integer.value;
+
+ if (out_obj->package.elements[CAP_CODE_RT_VER_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ cap_hdr->code_rt_version =
+ out_obj->package.elements[CAP_CODE_RT_VER_IDX].integer.value;
+
+ if (out_obj->package.elements[CAP_DRV_TYPE_IDX].type != ACPI_TYPE_BUFFER)
+ goto free_acpi_buffer;
+
+ memcpy(&cap_hdr->drv_type,
+ out_obj->package.elements[CAP_DRV_TYPE_IDX].buffer.pointer,
+ out_obj->package.elements[CAP_DRV_TYPE_IDX].buffer.length);
+
+ if (out_obj->package.elements[CAP_DRV_RT_VER_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ cap_hdr->drv_rt_version =
+ out_obj->package.elements[CAP_DRV_RT_VER_IDX].integer.value;
+
+ if (out_obj->package.elements[CAP_DRV_SVN_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ cap_hdr->drv_svn =
+ out_obj->package.elements[CAP_DRV_SVN_IDX].integer.value;
+
+ if (out_obj->package.elements[CAP_PLAT_ID_IDX].type != ACPI_TYPE_BUFFER)
+ goto free_acpi_buffer;
+
+ memcpy(&cap_hdr->platform_id,
+ out_obj->package.elements[CAP_PLAT_ID_IDX].buffer.pointer,
+ out_obj->package.elements[CAP_PLAT_ID_IDX].buffer.length);
+
+ if (out_obj->package.elements[CAP_OEM_ID_IDX].type != ACPI_TYPE_BUFFER)
+ goto free_acpi_buffer;
+
+ memcpy(&cap_hdr->oem_id,
+ out_obj->package.elements[CAP_OEM_ID_IDX].buffer.pointer,
+ out_obj->package.elements[CAP_OEM_ID_IDX].buffer.length);
+
+ if (out_obj->package.elements[CAP_OEM_INFO_IDX].type != ACPI_TYPE_BUFFER)
+ goto free_acpi_buffer;
+
+ cap_hdr->oem_info_len =
+ out_obj->package.elements[CAP_OEM_INFO_IDX].buffer.length;
+
+ ret = 0;
+
+free_acpi_buffer:
+ kfree(out_obj);
+
+ return ret;
+}
+
+static int query_buffer(struct pfru_com_buf_info *info,
+ struct pfru_device *pfru_dev)
+{
+ acpi_handle handle = ACPI_HANDLE(pfru_dev->parent_dev);
+ union acpi_object *out_obj;
+ int ret = -EINVAL;
+
+ out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
+ pfru_dev->rev_id, PFRU_FUNC_QUERY_BUF,
+ NULL, ACPI_TYPE_PACKAGE);
+ if (!out_obj)
+ return ret;
+
+ if (out_obj->package.count < BUF_NR_IDX)
+ goto free_acpi_buffer;
+
+ if (out_obj->package.elements[BUF_STATUS_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ info->status = out_obj->package.elements[BUF_STATUS_IDX].integer.value;
+
+ if (out_obj->package.elements[BUF_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ info->ext_status =
+ out_obj->package.elements[BUF_EXT_STATUS_IDX].integer.value;
+
+ if (out_obj->package.elements[BUF_ADDR_LOW_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ info->addr_lo =
+ out_obj->package.elements[BUF_ADDR_LOW_IDX].integer.value;
+
+ if (out_obj->package.elements[BUF_ADDR_HI_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ info->addr_hi =
+ out_obj->package.elements[BUF_ADDR_HI_IDX].integer.value;
+
+ if (out_obj->package.elements[BUF_SIZE_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ info->buf_size = out_obj->package.elements[BUF_SIZE_IDX].integer.value;
+
+ ret = 0;
+
+free_acpi_buffer:
+ kfree(out_obj);
+
+ return ret;
+}
+
+static int get_image_type(const struct efi_manage_capsule_image_header *img_hdr,
+ struct pfru_device *pfru_dev)
+{
+ const efi_guid_t *image_type_id = &img_hdr->image_type_id;
+
+ /* check whether this is a code injection or driver update */
+ if (guid_equal(image_type_id, &pfru_code_inj_guid))
+ return PFRU_CODE_INJECT_TYPE;
+
+ if (guid_equal(image_type_id, &pfru_drv_update_guid))
+ return PFRU_DRIVER_UPDATE_TYPE;
+
+ return -EINVAL;
+}
+
+static int adjust_efi_size(const struct efi_manage_capsule_image_header *img_hdr,
+ int size)
+{
+ /*
+ * The (u64 hw_ins) was introduced in UEFI spec version 2,
+ * and (u64 capsule_support) was introduced in version 3.
+ * The size needs to be adjusted accordingly. That is to
+ * say, version 1 should subtract the size of hw_ins+capsule_support,
+ * and version 2 should sbstract the size of capsule_support.
+ */
+ size += sizeof(struct efi_manage_capsule_image_header);
+ switch (img_hdr->ver) {
+ case 1:
+ return size - 2 * sizeof(u64);
+ case 2:
+ return size - sizeof(u64);
+ default:
+ /* only support version 1 and 2 */
+ return -EINVAL;
+ }
+}
+
+static bool valid_version(const void *data, struct pfru_update_cap_info *cap,
+ struct pfru_device *pfru_dev)
+{
+ struct pfru_payload_hdr *payload_hdr;
+ const efi_capsule_header_t *cap_hdr = data;
+ const struct efi_manage_capsule_header *m_hdr;
+ const struct efi_manage_capsule_image_header *m_img_hdr;
+ const struct efi_image_auth *auth;
+ int type, size;
+
+ /*
+ * Sanity check if the capsule image has a newer version
+ * than current one.
+ */
+ size = cap_hdr->headersize;
+ m_hdr = data + size;
+ /*
+ * Current data structure size plus variable array indicated
+ * by number of (emb_drv_cnt + payload_cnt)
+ */
+ size += offsetof(struct efi_manage_capsule_header, offset_list) +
+ (m_hdr->emb_drv_cnt + m_hdr->payload_cnt) * sizeof(u64);
+ m_img_hdr = data + size;
+
+ type = get_image_type(m_img_hdr, pfru_dev);
+ if (type < 0)
+ return false;
+
+ size = adjust_efi_size(m_img_hdr, size);
+ if (size < 0)
+ return false;
+
+ auth = data + size;
+ size += sizeof(u64) + auth->auth_info.hdr.len;
+ payload_hdr = (struct pfru_payload_hdr *)(data + size);
+
+ /* finally compare the version */
+ if (type == PFRU_CODE_INJECT_TYPE)
+ return payload_hdr->rt_ver >= cap->code_rt_version;
+ else
+ return payload_hdr->rt_ver >= cap->drv_rt_version;
+}
+
+static void dump_update_result(struct pfru_updated_result *result,
+ struct pfru_device *pfru_dev)
+{
+ dev_dbg(pfru_dev->parent_dev, "Update result:\n");
+ dev_dbg(pfru_dev->parent_dev, "Status:%d\n", result->status);
+ dev_dbg(pfru_dev->parent_dev, "Extended Status:%d\n", result->ext_status);
+ dev_dbg(pfru_dev->parent_dev, "Authentication Time Low:%lld\n",
+ result->low_auth_time);
+ dev_dbg(pfru_dev->parent_dev, "Authentication Time High:%lld\n",
+ result->high_auth_time);
+ dev_dbg(pfru_dev->parent_dev, "Execution Time Low:%lld\n",
+ result->low_exec_time);
+ dev_dbg(pfru_dev->parent_dev, "Execution Time High:%lld\n",
+ result->high_exec_time);
+}
+
+static int start_acpi_update(int action, struct pfru_device *pfru_dev)
+{
+ union acpi_object *out_obj, in_obj, in_buf;
+ struct pfru_updated_result update_result;
+ acpi_handle handle;
+ int ret = -EINVAL;
+
+ memset(&in_obj, 0, sizeof(in_obj));
+ memset(&in_buf, 0, sizeof(in_buf));
+ in_obj.type = ACPI_TYPE_PACKAGE;
+ in_obj.package.count = 1;
+ in_obj.package.elements = &in_buf;
+ in_buf.type = ACPI_TYPE_INTEGER;
+ in_buf.integer.value = action;
+
+ handle = ACPI_HANDLE(pfru_dev->parent_dev);
+ out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
+ pfru_dev->rev_id, PFRU_FUNC_START,
+ &in_obj, ACPI_TYPE_PACKAGE);
+ if (!out_obj)
+ return ret;
+
+ if (out_obj->package.count < UPDATE_NR_IDX)
+ goto free_acpi_buffer;
+
+ if (out_obj->package.elements[UPDATE_STATUS_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ update_result.status =
+ out_obj->package.elements[UPDATE_STATUS_IDX].integer.value;
+
+ if (out_obj->package.elements[UPDATE_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ update_result.ext_status =
+ out_obj->package.elements[UPDATE_EXT_STATUS_IDX].integer.value;
+
+ if (out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ update_result.low_auth_time =
+ out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].integer.value;
+
+ if (out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ update_result.high_auth_time =
+ out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].integer.value;
+
+ if (out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ update_result.low_exec_time =
+ out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].integer.value;
+
+ if (out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].type != ACPI_TYPE_INTEGER)
+ goto free_acpi_buffer;
+
+ update_result.high_exec_time =
+ out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].integer.value;
+
+ dump_update_result(&update_result, pfru_dev);
+ ret = 0;
+
+free_acpi_buffer:
+ kfree(out_obj);
+
+ return ret;
+}
+
+static long pfru_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct pfru_update_cap_info cap_hdr;
+ struct pfru_device *pfru_dev = to_pfru_dev(file);
+ void __user *p = (void __user *)arg;
+ u32 rev;
+ int ret;
+
+ switch (cmd) {
+ case PFRU_IOC_QUERY_CAP:
+ ret = query_capability(&cap_hdr, pfru_dev);
+ if (ret)
+ return ret;
+
+ if (copy_to_user(p, &cap_hdr, sizeof(cap_hdr)))
+ return -EFAULT;
+
+ return 0;
+ case PFRU_IOC_SET_REV:
+ if (copy_from_user(&rev, p, sizeof(rev)))
+ return -EFAULT;
+
+ if (!pfru_valid_revid(rev))
+ return -EINVAL;
+
+ pfru_dev->rev_id = rev;
+
+ return 0;
+ case PFRU_IOC_STAGE:
+ return start_acpi_update(START_STAGE, pfru_dev);
+ case PFRU_IOC_ACTIVATE:
+ return start_acpi_update(START_ACTIVATE, pfru_dev);
+ case PFRU_IOC_STAGE_ACTIVATE:
+ return start_acpi_update(START_STAGE_ACTIVATE, pfru_dev);
+ default:
+ return -ENOTTY;
+ }
+}
+
+static ssize_t pfru_write(struct file *file, const char __user *buf,
+ size_t len, loff_t *ppos)
+{
+ struct pfru_device *pfru_dev = to_pfru_dev(file);
+ struct pfru_update_cap_info cap;
+ struct pfru_com_buf_info buf_info;
+ phys_addr_t phy_addr;
+ struct iov_iter iter;
+ struct iovec iov;
+ char *buf_ptr;
+ int ret;
+
+ ret = query_buffer(&buf_info, pfru_dev);
+ if (ret)
+ return ret;
+
+ if (len > buf_info.buf_size)
+ return -EINVAL;
+
+ iov.iov_base = (void __user *)buf;
+ iov.iov_len = len;
+ iov_iter_init(&iter, WRITE, &iov, 1, len);
+
+ /* map the communication buffer */
+ phy_addr = (phys_addr_t)((buf_info.addr_hi << 32) | buf_info.addr_lo);
+ buf_ptr = memremap(phy_addr, buf_info.buf_size, MEMREMAP_WB);
+ if (IS_ERR(buf_ptr))
+ return PTR_ERR(buf_ptr);
+
+ if (!copy_from_iter_full(buf_ptr, len, &iter)) {
+ ret = -EINVAL;
+ goto unmap;
+ }
+
+ /* check if the capsule header has a valid version number */
+ ret = query_capability(&cap, pfru_dev);
+ if (ret)
+ goto unmap;
+
+ if (cap.status != DSM_SUCCEED)
+ ret = -EBUSY;
+ else if (!valid_version(buf_ptr, &cap, pfru_dev))
+ ret = -EINVAL;
+
+unmap:
+ memunmap(buf_ptr);
+
+ return ret ?: len;
+}
+
+static const struct file_operations acpi_pfru_fops = {
+ .owner = THIS_MODULE,
+ .write = pfru_write,
+ .unlocked_ioctl = pfru_ioctl,
+ .llseek = noop_llseek,
+};
+
+static int acpi_pfru_remove(struct platform_device *pdev)
+{
+ struct pfru_device *pfru_dev = platform_get_drvdata(pdev);
+
+ misc_deregister(&pfru_dev->miscdev);
+
+ return 0;
+}
+
+static void pfru_put_idx(void *data)
+{
+ struct pfru_device *pfru_dev = data;
+
+ ida_free(&pfru_ida, pfru_dev->index);
+}
+
+static int acpi_pfru_probe(struct platform_device *pdev)
+{
+ acpi_handle handle = ACPI_HANDLE(&pdev->dev);
+ struct pfru_device *pfru_dev;
+ int ret;
+
+ if (!acpi_has_method(handle, "_DSM")) {
+ dev_dbg(&pdev->dev, "Missing _DSM\n");
+ return -ENODEV;
+ }
+
+ pfru_dev = devm_kzalloc(&pdev->dev, sizeof(*pfru_dev), GFP_KERNEL);
+ if (!pfru_dev)
+ return -ENOMEM;
+
+ ret = ida_alloc(&pfru_ida, GFP_KERNEL);
+ if (ret < 0)
+ return ret;
+
+ pfru_dev->index = ret;
+ ret = devm_add_action_or_reset(&pdev->dev, pfru_put_idx, pfru_dev);
+ if (ret)
+ return ret;
+
+ pfru_dev->rev_id = PFRU_DEFAULT_REV_ID;
+ pfru_dev->parent_dev = &pdev->dev;
+
+ pfru_dev->miscdev.minor = MISC_DYNAMIC_MINOR;
+ pfru_dev->miscdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+ "pfru%d", pfru_dev->index);
+ if (!pfru_dev->miscdev.name)
+ return -ENOMEM;
+
+ pfru_dev->miscdev.nodename = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+ "acpi_pfru%d", pfru_dev->index);
+ if (!pfru_dev->miscdev.nodename)
+ return -ENOMEM;
+
+ pfru_dev->miscdev.fops = &acpi_pfru_fops;
+ pfru_dev->miscdev.parent = &pdev->dev;
+
+ ret = misc_register(&pfru_dev->miscdev);
+ if (ret)
+ return ret;
+
+ platform_set_drvdata(pdev, pfru_dev);
+
+ return 0;
+}
+
+static const struct acpi_device_id acpi_pfru_ids[] = {
+ {"INTC1080"},
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, acpi_pfru_ids);
+
+static struct platform_driver acpi_pfru_driver = {
+ .driver = {
+ .name = "pfru_update",
+ .acpi_match_table = acpi_pfru_ids,
+ },
+ .probe = acpi_pfru_probe,
+ .remove = acpi_pfru_remove,
+};
+module_platform_driver(acpi_pfru_driver);
+
+MODULE_DESCRIPTION("Platform Firmware Runtime Update device driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/uapi/linux/pfru.h b/include/uapi/linux/pfru.h
new file mode 100644
index 000000000000..fed50cb01309
--- /dev/null
+++ b/include/uapi/linux/pfru.h
@@ -0,0 +1,174 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Platform Firmware Runtime Update header
+ *
+ * Copyright(c) 2021 Intel Corporation. All rights reserved.
+ */
+#ifndef __PFRU_H__
+#define __PFRU_H__
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+#define PFRU_MAGIC_FOR_IOCTL 0xEE
+
+/**
+ * PFRU_IOC_SET_REV - _IOW(PFRU_MAGIC_FOR_IOCTL, 0x01, unsigned int)
+ *
+ * Return:
+ * * 0 - success
+ * * -EFAULT - fail to read the revision id
+ * * -EINVAL - user provides an invalid revision id
+ *
+ * Set the Revision ID for PFRU Runtime Update.
+ */
+#define PFRU_IOC_SET_REV _IOW(PFRU_MAGIC_FOR_IOCTL, 0x01, unsigned int)
+
+/**
+ * PFRU_IOC_STAGE - _IOW(PFRU_MAGIC_FOR_IOCTL, 0x02, unsigned int)
+ *
+ * Return:
+ * * 0 - success
+ * * -EINVAL - stage phase returns invalid result
+ *
+ * Stage a capsule image from communication buffer and perform authentication.
+ */
+#define PFRU_IOC_STAGE _IOW(PFRU_MAGIC_FOR_IOCTL, 0x02, unsigned int)
+
+/**
+ * PFRU_IOC_ACTIVATE - _IOW(PFRU_MAGIC_FOR_IOCTL, 0x03, unsigned int)
+ *
+ * Return:
+ * * 0 - success
+ * * -EINVAL - activate phase returns invalid result
+ *
+ * Activate a previous staged capsule image.
+ */
+#define PFRU_IOC_ACTIVATE _IOW(PFRU_MAGIC_FOR_IOCTL, 0x03, unsigned int)
+
+/**
+ * PFRU_IOC_STAGE_ACTIVATE - _IOW(PFRU_MAGIC_FOR_IOCTL, 0x04, unsigned int)
+ *
+ * Return:
+ * * 0 - success
+ * * -EINVAL - stage/activate phase returns invalid result.
+ *
+ * Perform both stage and activation action.
+ */
+#define PFRU_IOC_STAGE_ACTIVATE _IOW(PFRU_MAGIC_FOR_IOCTL, 0x04, unsigned int)
+
+/**
+ * PFRU_IOC_QUERY_CAP - _IOR(PFRU_MAGIC_FOR_IOCTL, 0x05,
+ * struct pfru_update_cap_info)
+ *
+ * Return:
+ * * 0 - success
+ * * -EINVAL - query phase returns invalid result
+ * * -EFAULT - the result fails to be copied to userspace
+ *
+ * Retrieve information about the PFRU Runtime Update capability.
+ * The information is a struct pfru_update_cap_info.
+ */
+#define PFRU_IOC_QUERY_CAP _IOR(PFRU_MAGIC_FOR_IOCTL, 0x05, struct pfru_update_cap_info)
+
+/**
+ * struct pfru_payload_hdr - Capsule file payload header.
+ *
+ * @sig: Signature of this capsule file.
+ * @hdr_version: Revision of this header structure.
+ * @hdr_size: Size of this header, including the OemHeader bytes.
+ * @hw_ver: The supported firmware version.
+ * @rt_ver: Version of the code injection image.
+ * @platform_id: A platform specific GUID to specify the platform what
+ * this capsule image support.
+ */
+struct pfru_payload_hdr {
+ __u32 sig;
+ __u32 hdr_version;
+ __u32 hdr_size;
+ __u32 hw_ver;
+ __u32 rt_ver;
+ __u8 platform_id[16];
+};
+
+enum pfru_dsm_status {
+ DSM_SUCCEED = 0,
+ DSM_FUNC_NOT_SUPPORT = 1,
+ DSM_INVAL_INPUT = 2,
+ DSM_HARDWARE_ERR = 3,
+ DSM_RETRY_SUGGESTED = 4,
+ DSM_UNKNOWN = 5,
+ DSM_FUNC_SPEC_ERR = 6,
+};
+
+/**
+ * struct pfru_update_cap_info - Runtime update capability information.
+ *
+ * @status: Indicator of whether this query succeed.
+ * @update_cap: Bitmap to indicate whether the feature is supported.
+ * @code_type: A buffer containing an image type GUID.
+ * @fw_version: Platform firmware version.
+ * @code_rt_version: Code injection runtime version for anti-rollback.
+ * @drv_type: A buffer containing an image type GUID.
+ * @drv_rt_version: The version of the driver update runtime code.
+ * @drv_svn: The secure version number(SVN) of the driver update runtime code.
+ * @platform_id: A buffer containing a platform ID GUID.
+ * @oem_id: A buffer containing an OEM ID GUID.
+ * @oem_info_len: Length of the buffer containing the vendor specific information.
+ */
+struct pfru_update_cap_info {
+ __u32 status;
+ __u32 update_cap;
+
+ __u8 code_type[16];
+ __u32 fw_version;
+ __u32 code_rt_version;
+
+ __u8 drv_type[16];
+ __u32 drv_rt_version;
+ __u32 drv_svn;
+
+ __u8 platform_id[16];
+ __u8 oem_id[16];
+
+ __u32 oem_info_len;
+};
+
+/**
+ * struct pfru_com_buf_info - Communication buffer information.
+ *
+ * @status: Indicator of whether this query succeed.
+ * @ext_status: Implementation specific query result.
+ * @addr_lo: Low 32bit physical address of the communication buffer to hold
+ * a runtime update package.
+ * @addr_hi: High 32bit physical address of the communication buffer to hold
+ * a runtime update package.
+ * @buf_size: Maximum size in bytes of the communication buffer.
+ */
+struct pfru_com_buf_info {
+ __u32 status;
+ __u32 ext_status;
+ __u64 addr_lo;
+ __u64 addr_hi;
+ __u32 buf_size;
+};
+
+/**
+ * struct pfru_updated_result - Platform firmware runtime update result information.
+ * @status: Indicator of whether this update succeed.
+ * @ext_status: Implementation specific update result.
+ * @low_auth_time: Low 32bit value of image authentication time in nanosecond.
+ * @high_auth_time: High 32bit value of image authentication time in nanosecond.
+ * @low_exec_time: Low 32bit value of image execution time in nanosecond.
+ * @high_exec_time: High 32bit value of image execution time in nanosecond.
+ */
+struct pfru_updated_result {
+ __u32 status;
+ __u32 ext_status;
+ __u64 low_auth_time;
+ __u64 high_auth_time;
+ __u64 low_exec_time;
+ __u64 high_exec_time;
+};
+
+#endif /* __PFRU_H__ */
--
2.25.1
Introduce a user space tool to make use of the interface exposed by
Platform Firmware Runtime Update and Telemetry drivers. The users
can use this tool to do firmware code injection, driver update and
to retrieve the telemetry data.
Signed-off-by: Chen Yu <[email protected]>
---
v9: Add this tool into tools/power/acpi build infrastructure.
(Andy Shevchenko)
v8: Print the length of OEM information if requested.
v7: No change since v6.
v6: Simplify the userspace tool to use while loop for getopt_long().
(Andy Shevchenko)
v5: Replace the read() with mmap() so that the userspace
could mmap once, and read multiple times. (Greg Kroah-Hartman)
---
tools/power/acpi/.gitignore | 1 +
tools/power/acpi/Makefile | 16 +-
tools/power/acpi/Makefile.rules | 2 +-
tools/power/acpi/man/pfru.8 | 137 +++++++++
tools/power/acpi/tools/pfru/Makefile | 23 ++
tools/power/acpi/tools/pfru/pfru.c | 417 +++++++++++++++++++++++++++
6 files changed, 587 insertions(+), 9 deletions(-)
create mode 100644 tools/power/acpi/man/pfru.8
create mode 100644 tools/power/acpi/tools/pfru/Makefile
create mode 100644 tools/power/acpi/tools/pfru/pfru.c
diff --git a/tools/power/acpi/.gitignore b/tools/power/acpi/.gitignore
index 0b319fc8bb17..a6f196912999 100644
--- a/tools/power/acpi/.gitignore
+++ b/tools/power/acpi/.gitignore
@@ -2,4 +2,5 @@
/acpidbg
/acpidump
/ec
+/pfru
/include/
diff --git a/tools/power/acpi/Makefile b/tools/power/acpi/Makefile
index a249c50ebf55..2fcf09d3add3 100644
--- a/tools/power/acpi/Makefile
+++ b/tools/power/acpi/Makefile
@@ -9,18 +9,18 @@ include ../../scripts/Makefile.include
.NOTPARALLEL:
-all: acpidbg acpidump ec
-clean: acpidbg_clean acpidump_clean ec_clean
-install: acpidbg_install acpidump_install ec_install
-uninstall: acpidbg_uninstall acpidump_uninstall ec_uninstall
+all: acpidbg acpidump ec pfru
+clean: acpidbg_clean acpidump_clean ec_clean pfru_clean
+install: acpidbg_install acpidump_install ec_install pfru_install
+uninstall: acpidbg_uninstall acpidump_uninstall ec_uninstall pfru_uninstall
-acpidbg acpidump ec: FORCE
+acpidbg acpidump ec pfru: FORCE
$(call descend,tools/$@,all)
-acpidbg_clean acpidump_clean ec_clean:
+acpidbg_clean acpidump_clean ec_clean pfru_clean:
$(call descend,tools/$(@:_clean=),clean)
-acpidbg_install acpidump_install ec_install:
+acpidbg_install acpidump_install ec_install pfru_install:
$(call descend,tools/$(@:_install=),install)
-acpidbg_uninstall acpidump_uninstall ec_uninstall:
+acpidbg_uninstall acpidump_uninstall ec_uninstall pfru_uninstall:
$(call descend,tools/$(@:_uninstall=),uninstall)
.PHONY: FORCE
diff --git a/tools/power/acpi/Makefile.rules b/tools/power/acpi/Makefile.rules
index 2a6c170b57cd..68aa7e92d554 100644
--- a/tools/power/acpi/Makefile.rules
+++ b/tools/power/acpi/Makefile.rules
@@ -9,7 +9,7 @@ objdir := $(OUTPUT)tools/$(TOOL)/
toolobjs := $(addprefix $(objdir),$(TOOL_OBJS))
$(OUTPUT)$(TOOL): $(toolobjs) FORCE
$(ECHO) " LD " $(subst $(OUTPUT),,$@)
- $(QUIET) $(LD) $(CFLAGS) $(LDFLAGS) $(toolobjs) -L$(OUTPUT) -o $@
+ $(QUIET) $(LD) $(CFLAGS) $(toolobjs) $(LDFLAGS) -L$(OUTPUT) -o $@
$(ECHO) " STRIP " $(subst $(OUTPUT),,$@)
$(QUIET) $(STRIPCMD) $@
diff --git a/tools/power/acpi/man/pfru.8 b/tools/power/acpi/man/pfru.8
new file mode 100644
index 000000000000..d9cda7beaa3c
--- /dev/null
+++ b/tools/power/acpi/man/pfru.8
@@ -0,0 +1,137 @@
+.TH "PFRU" "8" "October 2021" "pfru 1.0" ""
+.hy
+.SH Name
+.PP
+pfru \- Platform Firmware Runtime Update tool
+.SH SYNOPSIS
+.PP
+\f[B]pfru\f[R] [\f[I]Options\f[R]]
+.SH DESCRIPTION
+.PP
+The PFRU(Platform Firmware Runtime Update) kernel interface is designed
+to
+.PD 0
+.P
+.PD
+interact with the platform firmware interface defined in the
+.PD 0
+.P
+.PD
+Management Mode Firmware Runtime
+Update (https://uefi.org/sites/default/files/resources/Intel_MM_OS_Interface_Spec_Rev100.pdf)
+.PD 0
+.P
+.PD
+\f[B]pfru\f[R] is the tool to interact with the kernel interface.
+.PD 0
+.P
+.PD
+.SH OPTIONS
+.TP
+.B \f[B]\-h\f[R], \f[B]\-\-help\f[R]
+Display helper information.
+.TP
+.B \f[B]\-l\f[R], \f[B]\-\-load\f[R]
+Load the capsule file into the system.
+To be more specific, the capsule file will be copied to the
+communication buffer.
+.TP
+.B \f[B]\-s\f[R], \f[B]\-\-stage\f[R]
+Stage the capsule image from communication buffer into Management Mode
+and perform authentication.
+.TP
+.B \f[B]\-a\f[R], \f[B]\-\-activate\f[R]
+Activate a previous staged capsule image.
+.TP
+.B \f[B]\-u\f[R], \f[B]\-\-update\f[R]
+Perform both stage and activation actions.
+.TP
+.B \f[B]\-q\f[R], \f[B]\-\-query\f[R]
+Query the update capability.
+.TP
+.B \f[B]\-d\f[R], \f[B]\-\-setrev\f[R]
+Set the revision ID of code injection/driver update.
+.TP
+.B \f[B]\-D\f[R], \f[B]\-\-setrevlog\f[R]
+Set the revision ID of telemetry.
+.TP
+.B \f[B]\-G\f[R], \f[B]\-\-getloginfo\f[R]
+Get telemetry log information and print it out.
+.TP
+.B \f[B]\-T\f[R], \f[B]\-\-type\f[R]
+Set the telemetry log data type.
+.TP
+.B \f[B]\-L\f[R], \f[B]\-\-level\f[R]
+Set the telemetry log level.
+.TP
+.B \f[B]\-R\f[R], \f[B]\-\-read\f[R]
+Read all the telemetry data and print it out.
+.SH EXAMPLES
+.PP
+\f[B]pfru \-G\f[R]
+.PP
+log_level:4
+.PD 0
+.P
+.PD
+log_type:0
+.PD 0
+.P
+.PD
+log_revid:2
+.PD 0
+.P
+.PD
+max_data_size:65536
+.PD 0
+.P
+.PD
+chunk1_size:0
+.PD 0
+.P
+.PD
+chunk2_size:1401
+.PD 0
+.P
+.PD
+rollover_cnt:0
+.PD 0
+.P
+.PD
+reset_cnt:4
+.PP
+\f[B]pfru \-q\f[R]
+.PP
+code injection image type:794bf8b2\-6e7b\-454e\-885f\-3fb9bb185402
+.PD 0
+.P
+.PD
+fw_version:0
+.PD 0
+.P
+.PD
+code_rt_version:1
+.PD 0
+.P
+.PD
+driver update image type:0e5f0b14\-f849\-7945\-ad81\-bc7b6d2bb245
+.PD 0
+.P
+.PD
+drv_rt_version:0
+.PD 0
+.P
+.PD
+drv_svn:0
+.PD 0
+.P
+.PD
+platform id:39214663\-b1a8\-4eaa\-9024\-f2bb53ea4723
+.PD 0
+.P
+.PD
+oem id:a36db54f\-ea2a\-e14e\-b7c4\-b5780e51ba3d
+.PP
+\f[B]pfru \-l yours.cap \-u \-T 1 \-L 4\f[R]
+.SH AUTHORS
+Chen Yu.
diff --git a/tools/power/acpi/tools/pfru/Makefile b/tools/power/acpi/tools/pfru/Makefile
new file mode 100644
index 000000000000..09002a81e10c
--- /dev/null
+++ b/tools/power/acpi/tools/pfru/Makefile
@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: GPL-2.0+
+
+include ../../Makefile.config
+
+TOOL = pfru
+EXTRA_INSTALL = install-man
+EXTRA_UNINSTALL = uninstall-man
+
+CFLAGS += -Wall -O2
+CFLAGS += -DPFRU_HEADER='"../../../../../include/uapi/linux/pfru.h"'
+LDFLAGS += -luuid
+
+TOOL_OBJS = \
+ pfru.o
+
+include ../../Makefile.rules
+
+install-man: $(srctree)/man/pfru.8
+ $(ECHO) " INST " pfru.8
+ $(QUIET) $(INSTALL_DATA) -D $< $(DESTDIR)$(mandir)/man8/pfru.8
+uninstall-man:
+ $(ECHO) " UNINST " pfru.8
+ $(QUIET) rm -f $(DESTDIR)$(mandir)/man8/pfru.8
diff --git a/tools/power/acpi/tools/pfru/pfru.c b/tools/power/acpi/tools/pfru/pfru.c
new file mode 100644
index 000000000000..eeec5043f825
--- /dev/null
+++ b/tools/power/acpi/tools/pfru/pfru.c
@@ -0,0 +1,417 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Platform Firmware Runtime Update tool to do Management
+ * Mode code injection/driver update and telemetry retrieval.
+ */
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <uuid/uuid.h>
+#include PFRU_HEADER
+
+char *capsule_name;
+int action, query_cap, log_type, log_level, log_read, log_getinfo,
+ revid, log_revid;
+int set_log_level, set_log_type,
+ set_revid, set_log_revid;
+
+char *progname;
+
+#define LOG_ERR 0
+#define LOG_WARN 1
+#define LOG_INFO 2
+#define LOG_VERB 4
+#define LOG_EXEC_IDX 0
+#define LOG_HISTORY_IDX 1
+#define REVID_1 1
+#define REVID_2 2
+
+static int valid_log_level(int level)
+{
+ return level == LOG_ERR || level == LOG_WARN ||
+ level == LOG_INFO || level == LOG_VERB;
+}
+
+static int valid_log_type(int type)
+{
+ return type == LOG_EXEC_IDX || type == LOG_HISTORY_IDX;
+}
+
+static inline int valid_log_revid(int id)
+{
+ return id == REVID_1 || id == REVID_2;
+}
+
+static void help(void)
+{
+ fprintf(stderr,
+ "usage: %s [OPTIONS]\n"
+ " code injection:\n"
+ " -l, --load\n"
+ " -s, --stage\n"
+ " -a, --activate\n"
+ " -u, --update [stage and activate]\n"
+ " -q, --query\n"
+ " -d, --revid update\n"
+ " telemetry:\n"
+ " -G, --getloginfo\n"
+ " -T, --type(0:execution, 1:history)\n"
+ " -L, --level(0, 1, 2, 4)\n"
+ " -R, --read\n"
+ " -D, --revid log\n",
+ progname);
+}
+
+char *option_string = "l:sauqd:GT:L:RD:h";
+static struct option long_options[] = {
+ {"load", required_argument, 0, 'l'},
+ {"stage", no_argument, 0, 's'},
+ {"activate", no_argument, 0, 'a'},
+ {"update", no_argument, 0, 'u'},
+ {"query", no_argument, 0, 'q'},
+ {"getloginfo", no_argument, 0, 'G'},
+ {"type", required_argument, 0, 'T'},
+ {"level", required_argument, 0, 'L'},
+ {"read", no_argument, 0, 'R'},
+ {"setrev", required_argument, 0, 'd'},
+ {"setrevlog", required_argument, 0, 'D'},
+ {"help", no_argument, 0, 'h'},
+ {}
+};
+
+static void parse_options(int argc, char **argv)
+{
+ int option_index = 0;
+ char *pathname;
+ int opt;
+
+ pathname = strdup(argv[0]);
+ progname = basename(pathname);
+
+ while ((opt = getopt_long_only(argc, argv, option_string,
+ long_options, &option_index)) != -1) {
+ switch (opt) {
+ case 'l':
+ capsule_name = optarg;
+ break;
+ case 's':
+ action = 1;
+ break;
+ case 'a':
+ action = 2;
+ break;
+ case 'u':
+ action = 3;
+ break;
+ case 'q':
+ query_cap = 1;
+ break;
+ case 'G':
+ log_getinfo = 1;
+ break;
+ case 'T':
+ log_type = atoi(optarg);
+ set_log_type = 1;
+ break;
+ case 'L':
+ log_level = atoi(optarg);
+ set_log_level = 1;
+ break;
+ case 'R':
+ log_read = 1;
+ break;
+ case 'd':
+ revid = atoi(optarg);
+ set_revid = 1;
+ break;
+ case 'D':
+ log_revid = atoi(optarg);
+ set_log_revid = 1;
+ break;
+ case 'h':
+ help();
+ exit(0);
+ default:
+ break;
+ }
+ }
+}
+
+void print_cap(struct pfru_update_cap_info *cap)
+{
+ char *uuid;
+
+ uuid = malloc(37);
+ if (!uuid) {
+ perror("Can not allocate uuid buffer\n");
+ exit(1);
+ }
+
+ uuid_unparse(cap->code_type, uuid);
+ printf("code injection image type:%s\n", uuid);
+ printf("fw_version:%d\n", cap->fw_version);
+ printf("code_rt_version:%d\n", cap->code_rt_version);
+
+ uuid_unparse(cap->drv_type, uuid);
+ printf("driver update image type:%s\n", uuid);
+ printf("drv_rt_version:%d\n", cap->drv_rt_version);
+ printf("drv_svn:%d\n", cap->drv_svn);
+
+ uuid_unparse(cap->platform_id, uuid);
+ printf("platform id:%s\n", uuid);
+ uuid_unparse(cap->oem_id, uuid);
+ printf("oem id:%s\n", uuid);
+ printf("oem information length:%d\n", cap->oem_info_len);
+
+ free(uuid);
+}
+
+int main(int argc, char *argv[])
+{
+ int fd_update, fd_update_log, fd_capsule;
+ struct pfru_log_data_info data_info;
+ struct pfru_log_info info;
+ struct pfru_update_cap_info cap;
+ void *addr_map_capsule;
+ struct stat st;
+ char *log_buf;
+ int ret = 0;
+
+ if (getuid() != 0) {
+ printf("Please run the tool as root - Exiting.\n");
+ return 1;
+ }
+
+ parse_options(argc, argv);
+
+ fd_update = open("/dev/acpi_pfru0", O_RDWR);
+ if (fd_update < 0) {
+ printf("PFRU device not supported - Quit...\n");
+ return 1;
+ }
+
+ fd_update_log = open("/dev/acpi_pfru_telemetry0", O_RDWR);
+ if (fd_update_log < 0) {
+ printf("PFRU telemetry device not supported - Quit...\n");
+ return 1;
+ }
+
+ if (query_cap) {
+ ret = ioctl(fd_update, PFRU_IOC_QUERY_CAP, &cap);
+ if (ret)
+ perror("Query Update Capability info failed.");
+ else
+ print_cap(&cap);
+
+ close(fd_update);
+ close(fd_update_log);
+
+ return ret;
+ }
+
+ if (log_getinfo) {
+ ret = ioctl(fd_update_log, PFRU_LOG_IOC_GET_DATA_INFO, &data_info);
+ if (ret) {
+ perror("Get telemetry data info failed.");
+ close(fd_update);
+ close(fd_update_log);
+
+ return 1;
+ }
+
+ ret = ioctl(fd_update_log, PFRU_LOG_IOC_GET_INFO, &info);
+ if (ret) {
+ perror("Get telemetry info failed.");
+ close(fd_update);
+ close(fd_update_log);
+
+ return 1;
+ }
+
+ printf("log_level:%d\n", info.log_level);
+ printf("log_type:%d\n", info.log_type);
+ printf("log_revid:%d\n", info.log_revid);
+ printf("max_data_size:%d\n", data_info.max_data_size);
+ printf("chunk1_size:%d\n", data_info.chunk1_size);
+ printf("chunk2_size:%d\n", data_info.chunk2_size);
+ printf("rollover_cnt:%d\n", data_info.rollover_cnt);
+ printf("reset_cnt:%d\n", data_info.reset_cnt);
+
+ return 0;
+ }
+
+ info.log_level = -1;
+ info.log_type = -1;
+ info.log_revid = -1;
+
+ if (set_log_level) {
+ if (!valid_log_level(log_level)) {
+ printf("Invalid log level %d\n",
+ log_level);
+ } else {
+ info.log_level = log_level;
+ }
+ }
+
+ if (set_log_type) {
+ if (!valid_log_type(log_type)) {
+ printf("Invalid log type %d\n",
+ log_type);
+ } else {
+ info.log_type = log_type;
+ }
+ }
+
+ if (set_log_revid) {
+ if (!valid_log_revid(log_revid)) {
+ printf("Invalid log revid %d, unchanged.\n",
+ log_revid);
+ } else {
+ info.log_revid = log_revid;
+ }
+ }
+
+ ret = ioctl(fd_update_log, PFRU_LOG_IOC_SET_INFO, &info);
+ if (ret) {
+ perror("Log information set failed.(log_level, log_type, log_revid)");
+ close(fd_update);
+ close(fd_update_log);
+
+ return 1;
+ }
+
+ if (set_revid) {
+ ret = ioctl(fd_update, PFRU_IOC_SET_REV, &revid);
+ if (ret) {
+ perror("pfru update revid set failed");
+ close(fd_update);
+ close(fd_update_log);
+
+ return 1;
+ }
+
+ printf("pfru update revid set to %d\n", revid);
+ }
+
+ if (capsule_name) {
+ fd_capsule = open(capsule_name, O_RDONLY);
+ if (fd_capsule < 0) {
+ perror("Can not open capsule file...");
+ close(fd_update);
+ close(fd_update_log);
+
+ return 1;
+ }
+
+ if (fstat(fd_capsule, &st) < 0) {
+ perror("Can not fstat capsule file...");
+ close(fd_capsule);
+ close(fd_update);
+ close(fd_update_log);
+
+ return 1;
+ }
+
+ addr_map_capsule = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED,
+ fd_capsule, 0);
+ if (addr_map_capsule == MAP_FAILED) {
+ perror("Failed to mmap capsule file.");
+ close(fd_capsule);
+ close(fd_update);
+ close(fd_update_log);
+
+ return 1;
+ }
+
+ ret = write(fd_update, (char *)addr_map_capsule, st.st_size);
+ printf("Load %d bytes of capsule file into the system\n",
+ ret);
+
+ if (ret == -1) {
+ perror("Failed to load capsule file");
+ close(fd_capsule);
+ close(fd_update);
+ close(fd_update_log);
+
+ return 1;
+ }
+
+ munmap(addr_map_capsule, st.st_size);
+ close(fd_capsule);
+ printf("Load done.\n");
+ }
+
+ if (action) {
+ if (action == 1) {
+ ret = ioctl(fd_update, PFRU_IOC_STAGE, NULL);
+ } else if (action == 2) {
+ ret = ioctl(fd_update, PFRU_IOC_ACTIVATE, NULL);
+ } else if (action == 3) {
+ ret = ioctl(fd_update, PFRU_IOC_STAGE_ACTIVATE, NULL);
+ } else {
+ close(fd_update);
+ close(fd_update_log);
+
+ return 1;
+ }
+ printf("Update finished, return %d\n", ret);
+ }
+
+ close(fd_update);
+
+ if (log_read) {
+ void *p_mmap;
+ int max_data_sz;
+
+ ret = ioctl(fd_update_log, PFRU_LOG_IOC_GET_DATA_INFO, &data_info);
+ if (ret) {
+ perror("Get telemetry data info failed.");
+ close(fd_update_log);
+
+ return 1;
+ }
+
+ max_data_sz = data_info.max_data_size;
+ if (!max_data_sz) {
+ printf("No telemetry data available.\n");
+ close(fd_update_log);
+
+ return 1;
+ }
+
+ log_buf = malloc(max_data_sz + 1);
+ if (!log_buf) {
+ perror("log_buf allocate failed.");
+ close(fd_update_log);
+
+ return 1;
+ }
+
+ p_mmap = mmap(NULL, max_data_sz, PROT_READ, MAP_SHARED, fd_update_log, 0);
+ if (p_mmap == MAP_FAILED) {
+ perror("mmap error.");
+ close(fd_update_log);
+
+ return 1;
+ }
+
+ memcpy(log_buf, p_mmap, max_data_sz);
+ log_buf[max_data_sz] = '\0';
+ printf("%s\n", log_buf);
+ free(log_buf);
+
+ munmap(p_mmap, max_data_sz);
+ }
+
+ close(fd_update_log);
+
+ return 0;
+}
--
2.25.1