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Wysocki" , Viresh Kumar , Shuah Khan , "Borislav Petkov" , Ingo Molnar , CC: Deepak Sharma , Alex Deucher , Mario Limonciello , Nathan Fontenot , Jinzhou Su , Xiaojian Du , , , Huang Rui Subject: [PATCH 05/19] cpufreq: amd: add fast switch function for amd-pstate module Date: Wed, 8 Sep 2021 22:59:47 +0800 Message-ID: <20210908150001.3702552-6-ray.huang@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210908150001.3702552-1-ray.huang@amd.com> References: <20210908150001.3702552-1-ray.huang@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 9751629c-aa0a-4fae-86d9-08d972d97f38 X-MS-TrafficTypeDiagnostic: MWHPR1201MB0143: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:2803; 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:(4636009)(46966006)(36840700001)(83380400001)(36860700001)(6666004)(70206006)(70586007)(2616005)(4326008)(81166007)(36756003)(82310400003)(47076005)(16526019)(2906002)(316002)(186003)(54906003)(110136005)(7696005)(8936002)(86362001)(5660300002)(26005)(508600001)(336012)(356005)(8676002)(1076003)(426003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Sep 2021 15:01:11.5847 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9751629c-aa0a-4fae-86d9-08d972d97f38 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: CO1NAM11FT036.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR1201MB0143 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce the fast switch function for amd-pstate module on the AMD processors which support the full MSR register control. It's able to decrease the lattency on interrupt context. Signed-off-by: Huang Rui --- drivers/cpufreq/amd-pstate.c | 64 ++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 4c9c9bf1d72b..32b4f6d79783 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -212,6 +212,66 @@ static int amd_pstate_target(struct cpufreq_policy *policy, return ret; } +static void amd_pstate_adjust_perf(unsigned int cpu, + unsigned long min_perf, + unsigned long target_perf, + unsigned long capacity) +{ + unsigned long amd_max_perf, amd_min_perf, amd_des_perf, + amd_cap_perf, lowest_nonlinear_perf; + struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); + struct amd_cpudata *cpudata = policy->driver_data; + + amd_cap_perf = READ_ONCE(cpudata->highest_perf); + lowest_nonlinear_perf = READ_ONCE(cpudata->lowest_nonlinear_perf); + + if (target_perf < capacity) + amd_des_perf = DIV_ROUND_UP(amd_cap_perf * target_perf, + capacity); + + amd_min_perf = READ_ONCE(cpudata->highest_perf); + if (min_perf < capacity) + amd_min_perf = DIV_ROUND_UP(amd_cap_perf * min_perf, capacity); + + if (amd_min_perf < lowest_nonlinear_perf) + amd_min_perf = lowest_nonlinear_perf; + + amd_max_perf = amd_cap_perf; + if (amd_max_perf < amd_min_perf) + amd_max_perf = amd_min_perf; + + amd_des_perf = clamp_t(unsigned long, amd_des_perf, + amd_min_perf, amd_max_perf); + + amd_pstate_update(cpudata, amd_min_perf, amd_des_perf, + amd_max_perf, true); +} + +static unsigned int amd_pstate_fast_switch(struct cpufreq_policy *policy, + unsigned int target_freq) +{ + u64 ratio; + struct amd_cpudata *cpudata = policy->driver_data; + unsigned long amd_max_perf, amd_min_perf, amd_des_perf, nominal_perf; + + if (!cpudata->max_freq) + return -ENODEV; + + amd_max_perf = READ_ONCE(cpudata->highest_perf); + amd_min_perf = READ_ONCE(cpudata->lowest_nonlinear_perf); + + amd_des_perf = DIV_ROUND_UP(target_freq * amd_max_perf, + cpudata->max_freq); + + amd_pstate_update(cpudata, amd_min_perf, amd_des_perf, + amd_max_perf, true); + + nominal_perf = READ_ONCE(cpudata->nominal_perf); + ratio = div_u64(amd_des_perf << SCHED_CAPACITY_SHIFT, nominal_perf); + + return cpudata->nominal_freq * ratio >> SCHED_CAPACITY_SHIFT; +} + static int amd_get_min_freq(struct amd_cpudata *cpudata) { struct cppc_perf_caps cppc_perf; @@ -356,6 +416,8 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy) /* It will be updated by governor */ policy->cur = policy->cpuinfo.min_freq; + policy->fast_switch_possible = true; + ret = freq_qos_add_request(&policy->constraints, &cpudata->req[0], FREQ_QOS_MIN, policy->cpuinfo.min_freq); if (ret < 0) { @@ -408,6 +470,8 @@ static struct cpufreq_driver amd_pstate_driver = { .flags = CPUFREQ_CONST_LOOPS | CPUFREQ_NEED_UPDATE_LIMITS, .verify = amd_pstate_verify, .target = amd_pstate_target, + .fast_switch = amd_pstate_fast_switch, + .adjust_perf = amd_pstate_adjust_perf, .init = amd_pstate_cpu_init, .exit = amd_pstate_cpu_exit, .name = "amd-pstate", -- 2.25.1