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Mon, 30 Jan 2023 23:23:46 -0600 From: Wyes Karny To: Rafael J Wysocki , Huang Rui , Jonathan Corbet , Viresh Kumar , , CC: , , , Bagas Sanjaya , , Len Brown , Robert Moore , Borislav Petkov , Ananth Narayan , , Tor Vic , Wyes Karny Subject: [PATCH v4 3/6] cpufreq: amd_pstate: Add guided autonomous mode Date: Tue, 31 Jan 2023 05:21:38 +0000 Message-ID: <20230131052141.96475-4-wyes.karny@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230131052141.96475-1-wyes.karny@amd.com> References: <20230131052141.96475-1-wyes.karny@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT004:EE_|DS7PR12MB8369:EE_ X-MS-Office365-Filtering-Correlation-Id: d86bc7f4-8aed-40e7-eb7d-08db034b570c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230025)(4636009)(396003)(346002)(136003)(39860400002)(376002)(451199018)(36840700001)(46966006)(40470700004)(82740400003)(86362001)(7416002)(110136005)(54906003)(5660300002)(356005)(44832011)(1076003)(36756003)(40460700003)(26005)(6666004)(81166007)(186003)(6636002)(16526019)(2616005)(316002)(2906002)(82310400005)(47076005)(40480700001)(70206006)(7696005)(83380400001)(426003)(8676002)(336012)(478600001)(8936002)(70586007)(36860700001)(4326008)(41300700001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 Jan 2023 05:23:52.0170 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d86bc7f4-8aed-40e7-eb7d-08db034b570c 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: DM6NAM11FT004.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB8369 X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE autolearn=no 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: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1756514454862584286?= X-GMAIL-MSGID: =?utf-8?q?1756514454862584286?= From ACPI spec below 3 modes for CPPC can be defined: 1. Non autonomous: OS scaling governor specifies operating frequency/ performance level through `Desired Performance` register and platform follows that. 2. Guided autonomous: OS scaling governor specifies min and max frequencies/ performance levels through `Minimum Performance` and `Maximum Performance` register, and platform can autonomously select an operating frequency in this range. 3. Fully autonomous: OS only hints (via EPP) to platform for the required energy performance preference for the workload and platform autonomously scales the frequency. Currently (1) is supported by amd_pstate as passive mode, and (3) is implemented by EPP support. This change is to support (2). In guided autonomous mode the min_perf is based on the input from the scaling governor. For example, in case of schedutil this value depends on the current utilization. And max_perf is set to max capacity. To activate guided auto mode ``amd_pstate=guided`` command line parameter has to be passed in the kernel. Signed-off-by: Wyes Karny Reviewed-by: Mario Limonciello --- .../admin-guide/kernel-parameters.txt | 15 +++++--- drivers/cpufreq/amd-pstate.c | 34 +++++++++++++++---- include/linux/amd-pstate.h | 2 ++ 3 files changed, 40 insertions(+), 11 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index e3618dfdb36a..0d8486325c9a 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -7015,11 +7015,11 @@ Do not enable amd_pstate as the default scaling driver for the supported processors passive - Use amd_pstate as a scaling driver, driver requests a - desired performance on this abstract scale and the power - management firmware translates the requests into actual - hardware states (core frequency, data fabric and memory - clocks etc.) + Use amd_pstate with passive mode as a scaling driver. + In this mode autonomous selection is disabled. + Driver requests a desired performance level and platform + tires to match the same performance level (if it is + satisfied by guaranteed performance level). active Use amd_pstate_epp driver instance as the scaling driver, driver provides a hint to the hardware if software wants @@ -7027,3 +7027,8 @@ to the CPPC firmware. then CPPC power algorithm will calculate the runtime workload and adjust the realtime cores frequency. + guided + Activate guided autonomous mode. Driver requests minimum and + maximum performance level and the platform autonomously + selects a performance level in this range and appropriate + to the current workload. diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index c5731fefcbef..48ab4684c3a5 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -267,7 +267,22 @@ static int cppc_init_perf(struct amd_cpudata *cpudata) cppc_perf.lowest_nonlinear_perf); WRITE_ONCE(cpudata->lowest_perf, cppc_perf.lowest_perf); - return 0; + if (cppc_state == AMD_PSTATE_ACTIVE) + return 0; + + ret = cppc_get_auto_sel_caps(cpudata->cpu, &cppc_perf); + if (ret) { + pr_warn("failed to get auto_sel, ret: %d\n", ret); + return 0; + } + + ret = cppc_set_auto_sel(cpudata->cpu, + (cppc_state == AMD_PSTATE_PASSIVE) ? 0 : 1); + + if (ret) + pr_warn("failed to set auto_sel, ret: %d\n", ret); + + return ret; } DEFINE_STATIC_CALL(amd_pstate_init_perf, pstate_init_perf); @@ -344,12 +359,18 @@ static inline bool amd_pstate_sample(struct amd_cpudata *cpudata) } static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf, - u32 des_perf, u32 max_perf, bool fast_switch) + u32 des_perf, u32 max_perf, bool fast_switch, int guv_flags) { u64 prev = READ_ONCE(cpudata->cppc_req_cached); u64 value = prev; des_perf = clamp_t(unsigned long, des_perf, min_perf, max_perf); + + if ((cppc_state == AMD_PSTATE_GUIDED) && (guv_flags & CPUFREQ_GOV_DYNAMIC_SWITCHING)) { + min_perf = des_perf; + des_perf = 0; + } + value &= ~AMD_CPPC_MIN_PERF(~0L); value |= AMD_CPPC_MIN_PERF(min_perf); @@ -404,7 +425,7 @@ static int amd_pstate_target(struct cpufreq_policy *policy, cpufreq_freq_transition_begin(policy, &freqs); amd_pstate_update(cpudata, min_perf, des_perf, - max_perf, false); + max_perf, false, policy->governor->flags); cpufreq_freq_transition_end(policy, &freqs, false); return 0; @@ -438,7 +459,8 @@ static void amd_pstate_adjust_perf(unsigned int cpu, if (max_perf < min_perf) max_perf = min_perf; - amd_pstate_update(cpudata, min_perf, des_perf, max_perf, true); + amd_pstate_update(cpudata, min_perf, des_perf, max_perf, true, + policy->governor->flags); cpufreq_cpu_put(policy); } @@ -1238,7 +1260,7 @@ static int __init amd_pstate_init(void) /* capability check */ if (boot_cpu_has(X86_FEATURE_CPPC)) { pr_debug("AMD CPPC MSR based functionality is supported\n"); - if (cppc_state == AMD_PSTATE_PASSIVE) + if (cppc_state != AMD_PSTATE_ACTIVE) current_pstate_driver->adjust_perf = amd_pstate_adjust_perf; } else { pr_debug("AMD CPPC shared memory based functionality is supported\n"); @@ -1300,7 +1322,7 @@ static int __init amd_pstate_param(char *str) if (cppc_state == AMD_PSTATE_ACTIVE) current_pstate_driver = &amd_pstate_epp_driver; - if (cppc_state == AMD_PSTATE_PASSIVE) + if (cppc_state == AMD_PSTATE_PASSIVE || cppc_state == AMD_PSTATE_GUIDED) current_pstate_driver = &amd_pstate_driver; return 0; diff --git a/include/linux/amd-pstate.h b/include/linux/amd-pstate.h index e9e291b7c2f9..85e980b8e0ac 100644 --- a/include/linux/amd-pstate.h +++ b/include/linux/amd-pstate.h @@ -92,6 +92,7 @@ enum amd_pstate_mode { AMD_PSTATE_DISABLE = 0, AMD_PSTATE_PASSIVE, AMD_PSTATE_ACTIVE, + AMD_PSTATE_GUIDED, AMD_PSTATE_MAX, }; @@ -99,6 +100,7 @@ static const char * const amd_pstate_mode_string[] = { [AMD_PSTATE_DISABLE] = "disable", [AMD_PSTATE_PASSIVE] = "passive", [AMD_PSTATE_ACTIVE] = "active", + [AMD_PSTATE_GUIDED] = "guided", NULL, };