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authorChen Yu <yu.c.chen@intel.com>2021-12-22 07:31:41 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2021-12-27 19:12:58 +0300
commit0db89fa243e5edc5de38c88b369e4c3755c5fb74 (patch)
tree21019fb65e2d11af6e6a71291775d1cebc1fcca3 /Documentation/userspace-api
parent1882de7fc56c2b0ea91dd9fd9922d434fc3feb15 (diff)
downloadlinux-0db89fa243e5edc5de38c88b369e4c3755c5fb74.tar.xz
ACPI: Introduce Platform Firmware Runtime Update device driver
Introduce the pfr_update driver which can be used for Platform Firmware Runtime code injection and driver update [1]. The user is expected to provide the EFI capsule, and pass it to the driver by writing the capsule to a device special file. The capsule is transferred by the driver to the platform firmware with the help of an ACPI _DSM method under the special ACPI Platform Firmware Runtime Update device (INTC1080), and the actual firmware update is carried out by the low-level Management Mode code in the platform firmware. This change allows certain pieces of the platform firmware to be updated on the fly while the system is running (runtime) without the need to restart it, which is key in the cases when the system needs to be available 100% of the time and it cannot afford the downtime related to restarting it, or when the work carried out by the system is particularly important, so it cannot be interrupted, and it is not practical to wait until it is complete. Link: https://uefi.org/sites/default/files/resources/Intel_MM_OS_Interface_Spec_Rev100.pdf # [1] Tested-by: Hongyu Ning <hongyu.ning@intel.com> Signed-off-by: Chen Yu <yu.c.chen@intel.com> [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/userspace-api')
-rw-r--r--Documentation/userspace-api/ioctl/ioctl-number.rst1
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst
index cfe6cccf0f44..687efcf245c1 100644
--- a/Documentation/userspace-api/ioctl/ioctl-number.rst
+++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
@@ -367,6 +367,7 @@ Code Seq# Include File Comments
<mailto:aherrman@de.ibm.com>
0xE5 00-3F linux/fuse.h
0xEC 00-01 drivers/platform/chrome/cros_ec_dev.h ChromeOS EC driver
+0xEE 00-09 uapi/linux/pfrut.h Platform Firmware Runtime Update and Telemetry
0xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
<mailto:thomas@winischhofer.net>
0xF6 all LTTng Linux Trace Toolkit Next Generation