Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Received-SPF: Pass (protection.outlook.com: domain of amd.com designates
 165.204.84.17 as permitted sender) receiver=protection.outlook.com;
 client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C
From:   Meng Li <li.meng@amd.com>
To:     Shuah Khan <skhan@linuxfoundation.org>,
        Huang Rui <ray.huang@amd.com>, <linux-pm@vger.kernel.org>
CC:     "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Nathan Fontenot <nathan.fontenot@amd.com>,
        Deepak Sharma <deepak.sharma@amd.com>,
        "Alex Deucher" <alexander.deucher@amd.com>,
        Mario Limonciello <mario.limonciello@amd.com>,
        Jinzhou Su <Jinzhou.Su@amd.com>,
        Perry Yuan <Perry.Yuan@amd.com>,
        Xiaojian Du <Xiaojian.Du@amd.com>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Borislav Petkov <bp@alien8.de>, <linux-kernel@vger.kernel.org>,
        Meng Li <li.meng@amd.com>
Subject: [RESEND PATCH 4/4] Documentation: amd-pstate: Add unit test introduction
Date:   Wed, 17 Aug 2022 11:46:30 +0800
Message-ID: <20220817034630.1172065-5-li.meng@amd.com>
In-Reply-To: <20220817034630.1172065-1-li.meng@amd.com>
References: <20220817034630.1172065-1-li.meng@amd.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Aug 2022 03:49:31.5668
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: cd6ace22-5225-4645-81d6-08da80037e2c
X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com]
X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT085.eop-nam11.prod.protection.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR12MB2693
X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,
        RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE,
        URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Introduce the AMD P-State unit test module design and implementation.
It also talks about kselftest and how to use.

Signed-off-by: Meng Li <li.meng@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
---
 Documentation/admin-guide/pm/amd-pstate.rst | 76 +++++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
index 83b58eb4ab4d..8f3d30c5a0d8 100644
--- a/Documentation/admin-guide/pm/amd-pstate.rst
+++ b/Documentation/admin-guide/pm/amd-pstate.rst
@@ -182,6 +182,7 @@ to the ``struct sugov_cpu`` that the utilization update belongs to.
 Then, ``amd-pstate`` updates the desired performance according to the CPU
 scheduler assigned.
 
+.. _processor_support:
 
 Processor Support
 =======================
@@ -282,6 +283,8 @@ efficiency frequency management method on AMD processors.
 Kernel Module Options for ``amd-pstate``
 =========================================
 
+.. _shared_mem:
+
 ``shared_mem``
 Use a module param (shared_mem) to enable related processors manually with
 **amd_pstate.shared_mem=1**.
@@ -393,6 +396,76 @@ about part of the output. ::
  CPU_005     712          116384        39        49        166       0.7565  9645075 2214891 38431470  25.1   11.646       469         2.496         kworker/5:0-40
  CPU_006     712          116408        39        49        166       0.6769  8950227 1839034 37192089  24.06  11.272       470         2.496         kworker/6:0-1264
 
+Unit Tests for amd-pstate
+-------------------------
+
+``amd-pstate-ut`` is a test module for testing the ``amd-pstate`` driver.
+
+ * It can help all users to verify their processor support (SBIOS/Firmware or Hardware).
+
+ * Kernel can have a basic function test to avoid the kernel regression during the update.
+
+ * We can introduce more functional or performance tests to align the result together, it will benefit power and performance scale optimization.
+
+1. Test case decriptions
+
+        +---------+--------------------------------+------------------------------------------------------------------------------------+
+        | Index   | Functions                      | Description                                                                        |
+        +=========+================================+====================================================================================+
+        | 0       | amd_pstate_ut_acpi_cpc_valid   || Check whether the _CPC object is present in SBIOS.                                |
+        |         |                                ||                                                                                   |
+        |         |                                || The detail refer to `Processor Support <processor_support_>`_.                    |
+        +---------+--------------------------------+------------------------------------------------------------------------------------+
+        | 1       | amd_pstate_ut_check_enabled    || Check whether AMD P-State is enabled.                                             |
+        |         |                                ||                                                                                   |
+        |         |                                || AMD P-States and ACPI hardware P-States always can be supported in one processor. |
+        |         |                                | But AMD P-States has the higher priority and if it is enabled with                 |
+        |         |                                | :c:macro:`MSR_AMD_CPPC_ENABLE` or ``cppc_set_enable``, it will respond to the      |
+        |         |                                | request from AMD P-States.                                                         |
+        +---------+--------------------------------+------------------------------------------------------------------------------------+
+        | 2       | amd_pstate_ut_check_perf       || Check if the each performance values are reasonable.                              |
+        |         |                                || highest_perf >= nominal_perf > lowest_nonlinear_perf > lowest_perf > 0.           |
+        +---------+--------------------------------+------------------------------------------------------------------------------------+
+        | 3       | amd_pstate_ut_check_freq       || Check if the each frequency values and max freq when set support boost mode       |
+        |         |                                | are reasonable.                                                                    |
+        |         |                                || max_freq >= nominal_freq > lowest_nonlinear_freq > min_freq > 0                   |
+        |         |                                || If boost is not active but supported, this maximum frequency will be larger than  |
+        |         |                                | the one in ``cpuinfo``.                                                            |
+        +---------+--------------------------------+------------------------------------------------------------------------------------+
+
+#. How to execute the tests
+
+   We use test module in the kselftest frameworks to implement it.
+   We create amd-pstate-ut module and tie it into kselftest.(for
+   details refer to Linux Kernel Selftests [4]_).
+
+    1. Build
+
+        + open the :c:macro:`CONFIG_X86_AMD_PSTATE` configuration option.
+        + set the :c:macro:`CONFIG_X86_AMD_PSTATE_UT` configuration option to M.
+        + make project
+        + make selftest ::
+
+            $ cd linux
+            $ make -C tools/testing/selftests
+
+    #. Installation & Steps ::
+
+        $ make -C tools/testing/selftests install INSTALL_PATH=~/kselftest
+        $ sudo ./kselftest/run_kselftest.sh -c amd-pstate
+        TAP version 13
+        1..1
+        # selftests: amd-pstate: amd-pstate-ut.sh
+        # amd-pstate-ut: ok
+        ok 1 selftests: amd-pstate: amd-pstate-ut.sh
+
+    #. Results ::
+
+         $ dmesg | grep "amd_pstate_ut" | tee log.txt
+         [12977.570663] amd_pstate_ut: 1    amd_pstate_ut_acpi_cpc_valid  success!
+         [12977.570673] amd_pstate_ut: 2    amd_pstate_ut_check_enabled   success!
+         [12977.571207] amd_pstate_ut: 3    amd_pstate_ut_check_perf      success!
+         [12977.571212] amd_pstate_ut: 4    amd_pstate_ut_check_freq      success!
 
 Reference
 ===========
@@ -405,3 +478,6 @@ Reference
 
 .. [3] Processor Programming Reference (PPR) for AMD Family 19h Model 51h, Revision A1 Processors
        https://www.amd.com/system/files/TechDocs/56569-A1-PUB.zip
+
+.. [4] Linux Kernel Selftests,
+       https://www.kernel.org/doc/html/latest/dev-tools/kselftest.html
-- 
2.25.1