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Mon, 10 Apr 2023 04:54:01 -0500 From: Wyes Karny To: , , CC: , , , , , , , , , , , , , , Wyes Karny Subject: [PATCH 2/2] amd_pstate: Add ->fast_switch() callback Date: Mon, 10 Apr 2023 09:53:39 +0000 Message-ID: <20230410095339.14923-1-wyes.karny@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230410095045.14872-1-wyes.karny@amd.com> References: <20230410095045.14872-1-wyes.karny@amd.com> MIME-Version: 1.0 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-TrafficTypeDiagnostic: CO1NAM11FT063:EE_|PH0PR12MB8176:EE_ X-MS-Office365-Filtering-Correlation-Id: d590cda1-7a4c-48a4-3ea4-08db39a98833 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:(13230028)(4636009)(376002)(346002)(396003)(136003)(39860400002)(451199021)(40470700004)(46966006)(36840700001)(8936002)(6666004)(7696005)(40480700001)(40460700003)(44832011)(7416002)(5660300002)(86362001)(70206006)(8676002)(70586007)(4326008)(478600001)(110136005)(316002)(82310400005)(36860700001)(82740400003)(356005)(54906003)(81166007)(2906002)(1076003)(26005)(2616005)(83380400001)(47076005)(426003)(336012)(186003)(41300700001)(36756003)(16526019)(36900700001)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Apr 2023 09:54:09.8810 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d590cda1-7a4c-48a4-3ea4-08db39a98833 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: CO1NAM11FT063.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB8176 X-Spam-Status: No, score=0.8 required=5.0 tests=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?1762783633092687711?= X-GMAIL-MSGID: =?utf-8?q?1762783633092687711?= From: "Gautham R. Shenoy" Schedutil normally calls the adjust_perf callback for drivers with adjust_perf callback available and fast_switch_possible flag set. However, when frequency invariance is disabled and schedutil tries to invoke fast_switch, and that callback is NULL, it schedules a kthread to invoke the target() callback, which could slow down the frequency update. Prevent the frequency update slow down by implementing the fast_switch callback for amd_pstate. Signed-off-by: Wyes Karny Signed-off-by: Gautham R. Shenoy --- drivers/cpufreq/amd-pstate.c | 33 +++++++++++++++++++++++++++------ 1 file changed, 27 insertions(+), 6 deletions(-) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 73c7643b2697..b3d594b35c65 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -422,9 +422,8 @@ static int amd_pstate_verify(struct cpufreq_policy_data *policy) return 0; } -static int amd_pstate_target(struct cpufreq_policy *policy, - unsigned int target_freq, - unsigned int relation) +static int amd_pstate_update_freq(struct cpufreq_policy *policy, + unsigned int target_freq, bool fast_switch) { struct cpufreq_freqs freqs; struct amd_cpudata *cpudata = policy->driver_data; @@ -443,14 +442,35 @@ static int amd_pstate_target(struct cpufreq_policy *policy, des_perf = DIV_ROUND_CLOSEST(target_freq * cap_perf, cpudata->max_freq); - cpufreq_freq_transition_begin(policy, &freqs); + WARN_ON(fast_switch && !policy->fast_switch_enabled); + /* + * If fast_switch is desired, then there aren't any registered + * transition notifiers. See comment for + * cpufreq_enable_fast_switch(). + */ + if (!fast_switch) + cpufreq_freq_transition_begin(policy, &freqs); amd_pstate_update(cpudata, min_perf, des_perf, - max_perf, false); - cpufreq_freq_transition_end(policy, &freqs, false); + max_perf, fast_switch); + if (!fast_switch) + cpufreq_freq_transition_end(policy, &freqs, false); return 0; } +static int amd_pstate_target(struct cpufreq_policy *policy, + unsigned int target_freq, + unsigned int relation) +{ + return amd_pstate_update_freq(policy, target_freq, false); +} + +static unsigned int amd_pstate_fast_switch(struct cpufreq_policy *policy, + unsigned int target_freq) +{ + return amd_pstate_update_freq(policy, target_freq, true); +} + static void amd_pstate_adjust_perf(unsigned int cpu, unsigned long _min_perf, unsigned long target_perf, @@ -1228,6 +1248,7 @@ 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, .init = amd_pstate_cpu_init, .exit = amd_pstate_cpu_exit, .suspend = amd_pstate_cpu_suspend,