linux-kernel - [PATCH v9 6/9] docs: misc-devices: (smpro-misc) Add documentation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220929094321.770125-7-quan@os.amperecomputing.com>
Date:   Thu, 29 Sep 2022 16:43:18 +0700
From:   Quan Nguyen <quan@...amperecomputing.com>
To:     macro@...am.me.uk, Lee Jones <lee@...nel.org>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Jonathan Corbet <corbet@....net>,
        Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Quan Nguyen <quan@...amperecomputing.com>,
        Thu Nguyen <thu@...amperecomputing.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Open Source Submission <patches@...erecomputing.com>
Cc:     Phong Vo <phong@...amperecomputing.com>,
        thang@...amperecomputing.com
Subject: [PATCH v9 6/9] docs: misc-devices: (smpro-misc) Add documentation

Adds documentation for the Ampere(R)'s Altra(R) SMpro misc driver.

Signed-off-by: Thu Nguyen <thu@...amperecomputing.com>
Signed-off-by: Quan Nguyen <quan@...amperecomputing.com>
---
Changes in v9:
  + Update SPDX licence                          [Greg]

Changes in v8:
  + Update to reflect single value per sysfs     [Quan]

Changes in v7:
  + None

Changes in v6:
  + First introduced in v6 [Quan]

 Documentation/misc-devices/index.rst      |  1 +
 Documentation/misc-devices/smpro-misc.rst | 82 +++++++++++++++++++++++
 2 files changed, 83 insertions(+)
 create mode 100644 Documentation/misc-devices/smpro-misc.rst

diff --git a/Documentation/misc-devices/index.rst b/Documentation/misc-devices/index.rst
index b74b3b34a235..b40cd1b402f7 100644
--- a/Documentation/misc-devices/index.rst
+++ b/Documentation/misc-devices/index.rst
@@ -28,6 +28,7 @@ fit into other categories.
    oxsemi-tornado
    pci-endpoint-test
    smpro-errmon
+   smpro-misc
    spear-pcie-gadget
    uacce
    xilinx_sdfec
diff --git a/Documentation/misc-devices/smpro-misc.rst b/Documentation/misc-devices/smpro-misc.rst
new file mode 100644
index 000000000000..d21be4a09e69
--- /dev/null
+++ b/Documentation/misc-devices/smpro-misc.rst
@@ -0,0 +1,82 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+Kernel driver Ampere(R) Altra(R) SMpro miscellaneous
+====================================================
+
+Supported chips:
+
+  * Ampere(R) Altra(R)
+
+    Prefix: 'smpro'
+
+    Reference: Altra SoC BMC Interface Specification
+
+Author: Thu Nguyen <thu@...amperecomputing.com>
+
+Description
+-----------
+
+This driver support the monitoring and configuration of various miscellaneous
+data provided by Ampere(R) Altra(R) SMpro processor.
+At this time, these include:
+
+  * Reading Boot Progress information
+  * Configuring SoC Power Limit
+
+Sysfs entries
+-------------
+
+1) Boot progress
+
+SMpro misc driver creates the sysfs files ``boot_progress``.
+The format of ``boot_progress`` file is as below::
+
+<boot stage><boot status><boot progress>
+
+Where:
+
+* Boot stage::
+
+    0: SMpro firmware booting.
+    1: PMpro firmware booting.
+    2: ATF BL1 firmware booting.
+    3: DDR initialization.
+    4: DDR training report status.
+    5: ATF BL2 firmware booting.
+    6: ATF BL31 firmware booting.
+    7: ATF BL32 firmware booting.
+    8: UEFI firmware booting.
+    9: OS booting.
+
+* Boot status::
+
+    0: Not started.
+    1: Started.
+    2: Complete without error.
+    3: Failure.
+
+* boot progress: 32 bits boot progress code
+
+The sysfs ``boot_progress`` only reports the boot state when the host is booting.
+If the host is already booted, it returns latest state.
+
+Example::
+
+    #cat boot_progress
+    0102808454A8
+
+2) SoC Power Limit
+
+SMpro misc driver creates the sysfs file ``soc_power_limit`` to get/set the SoC Power Limit.
+
+Reading this sysfs return the current setting of SoC Power Limit (W) in decimal string.
+Writing the desired value in decimal string to set the SoC Power Limit in Watt (W).
+The range of SoC Power Limit is 90-500(W) and will be ignored if out of range.
+
+Example::
+
+    #cat soc_power_limit
+    90
+    #echo 95 > soc_power_limit
+    #cat soc_power_limit
+    95
-- 
2.35.1