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Tue, 9 May 2023 13:05:51 -0500 From: Wyes Karny To: , , , , CC: , , , , , , , , , , , Wyes Karny , Subject: [PATCH v2 1/2] cpufreq/schedutil: Remove fast_switch_possible flag if driver doesn't set fast_switch Date: Tue, 9 May 2023 18:05:02 +0000 Message-ID: <20230509180503.739208-2-wyes.karny@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230509180503.739208-1-wyes.karny@amd.com> References: <20230509180503.739208-1-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: CO1NAM11FT021:EE_|SJ2PR12MB8782:EE_ X-MS-Office365-Filtering-Correlation-Id: eb994f30-98a3-426b-b077-08db50b80a91 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)(136003)(396003)(346002)(39860400002)(451199021)(46966006)(40470700004)(36840700001)(16526019)(81166007)(356005)(478600001)(7696005)(110136005)(54906003)(8936002)(44832011)(7416002)(86362001)(70586007)(70206006)(82310400005)(4326008)(6666004)(316002)(8676002)(41300700001)(40480700001)(26005)(2616005)(336012)(47076005)(83380400001)(82740400003)(186003)(1076003)(2906002)(40460700003)(36756003)(426003)(36860700001)(5660300002)(2101003)(36900700001)(309714004);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 May 2023 18:05:58.3175 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: eb994f30-98a3-426b-b077-08db50b80a91 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: CO1NAM11FT021.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8782 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, T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED 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?1765441115840392429?= X-GMAIL-MSGID: =?utf-8?q?1765441115840392429?= The set value of `fast_switch_enabled` indicates that fast_switch callback is set. For some drivers such as amd_pstate and intel_pstate, the adjust_perf callback is used but it still sets `fast_switch_possible` flag. This is because this flag also decides whether schedutil governor selects adjust_perf function for frequency update. This condition in the schedutil governor forces the scaling driver to set the `fast_switch_possible` flag. Remove `fast_switch_enabled` check when schedutil decides to select adjust_perf function for frequency update. Thus removing this drivers are now free to remove `fast_switch_possible` flag if they don't use fast_switch callback. This issue becomes apparent when aperf/mperf overflow occurs. When this happens, kernel disables frequency invariance calculation which causes schedutil to fallback to sugov_update_single_freq which currently relies on the fast_switch callback. Normal flow: sugov_update_single_perf cpufreq_driver_adjust_perf cpufreq_driver->adjust_perf Error case flow: sugov_update_single_perf sugov_update_single_freq <-- This is chosen because the freq invariant is disabled due to aperf/mperf overflow cpufreq_driver_fast_switch cpufreq_driver->fast_switch <-- Here NULL pointer dereference is happening, because fast_switch is not set This change fixes this NULL pointer dereference issue. Fixes: a61dec744745 ("cpufreq: schedutil: Avoid missing updates for one-CPU policies") Signed-off-by: Wyes Karny Cc: "Rafael J. Wysocki" Cc: stable@vger.kernel.org --- drivers/cpufreq/amd-pstate.c | 10 +++++++--- drivers/cpufreq/cpufreq.c | 20 +++++++++++++++++++- drivers/cpufreq/intel_pstate.c | 3 +-- include/linux/cpufreq.h | 1 + kernel/sched/cpufreq_schedutil.c | 2 +- 5 files changed, 29 insertions(+), 7 deletions(-) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 5a3d4aa0f45a..007bfe724a6a 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -671,8 +671,14 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy) /* It will be updated by governor */ policy->cur = policy->cpuinfo.min_freq; + /** + * For shared memory system frequency update takes time that's why + * do this in deferred kthread context. + */ if (boot_cpu_has(X86_FEATURE_CPPC)) - policy->fast_switch_possible = true; + current_pstate_driver->adjust_perf = amd_pstate_adjust_perf; + else + current_pstate_driver->adjust_perf = NULL; ret = freq_qos_add_request(&policy->constraints, &cpudata->req[0], FREQ_QOS_MIN, policy->cpuinfo.min_freq); @@ -697,8 +703,6 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy) policy->driver_data = cpudata; amd_pstate_boost_init(cpudata); - if (!current_pstate_driver->adjust_perf) - current_pstate_driver->adjust_perf = amd_pstate_adjust_perf; return 0; diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 6b52ebe5a890..366747012104 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -501,6 +501,13 @@ void cpufreq_enable_fast_switch(struct cpufreq_policy *policy) if (!policy->fast_switch_possible) return; + /** + * It's not expected driver's fast_switch callback is not set + * even fast_switch_possible is true. + */ + if (WARN_ON(!cpufreq_driver_has_fast_switch())) + return; + mutex_lock(&cpufreq_fast_switch_lock); if (cpufreq_fast_switch_count >= 0) { cpufreq_fast_switch_count++; @@ -2143,6 +2150,17 @@ unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy, } EXPORT_SYMBOL_GPL(cpufreq_driver_fast_switch); +/** + * cpufreq_driver_has_fast_switch - Check "fast switch" callback. + * + * Return 'true' if the ->fast_switch callback is present for the + * current driver or 'false' otherwise. + */ +bool cpufreq_driver_has_fast_switch(void) +{ + return !!cpufreq_driver->fast_switch; +} + /** * cpufreq_driver_adjust_perf - Adjust CPU performance level in one go. * @cpu: Target CPU. @@ -2157,7 +2175,7 @@ EXPORT_SYMBOL_GPL(cpufreq_driver_fast_switch); * and it is expected to select a suitable performance level equal to or above * @min_perf and preferably equal to or below @target_perf. * - * This function must not be called if policy->fast_switch_enabled is unset. + * By default this function takes the fast frequency update path. * * Governors calling this function must guarantee that it will never be invoked * twice in parallel for the same CPU and that it will never be called in diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 2548ec92faa2..007893514c87 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -2698,8 +2698,6 @@ static int __intel_pstate_cpu_init(struct cpufreq_policy *policy) intel_pstate_init_acpi_perf_limits(policy); - policy->fast_switch_possible = true; - return 0; } @@ -2955,6 +2953,7 @@ static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy) if (ret) return ret; + policy->fast_switch_possible = true; policy->cpuinfo.transition_latency = INTEL_CPUFREQ_TRANSITION_LATENCY; /* This reflects the intel_pstate_get_cpu_pstates() setting. */ policy->cur = policy->cpuinfo.min_freq; diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 26e2eb399484..7a32cfca26c9 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -604,6 +604,7 @@ struct cpufreq_governor { /* Pass a target to the cpufreq driver */ unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy, unsigned int target_freq); +bool cpufreq_driver_has_fast_switch(void); void cpufreq_driver_adjust_perf(unsigned int cpu, unsigned long min_perf, unsigned long target_perf, diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index e3211455b203..f993ecf731a9 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -776,7 +776,7 @@ static int sugov_start(struct cpufreq_policy *policy) if (policy_is_shared(policy)) uu = sugov_update_shared; 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Shenoy" , Wyes Karny Subject: [PATCH v2 2/2] amd_pstate: Add ->fast_switch() callback Date: Tue, 9 May 2023 18:05:03 +0000 Message-ID: <20230509180503.739208-3-wyes.karny@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230509180503.739208-1-wyes.karny@amd.com> References: <20230509180503.739208-1-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: CO1NAM11FT084:EE_|CH3PR12MB8901:EE_ X-MS-Office365-Filtering-Correlation-Id: f9f82251-35b1-4c73-4fff-08db50b81930 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)(136003)(39860400002)(346002)(396003)(376002)(451199021)(40470700004)(36840700001)(46966006)(426003)(83380400001)(336012)(186003)(16526019)(2616005)(2906002)(40460700003)(36756003)(82310400005)(86362001)(356005)(81166007)(82740400003)(36860700001)(47076005)(40480700001)(5660300002)(8676002)(8936002)(7416002)(44832011)(70206006)(70586007)(4326008)(478600001)(41300700001)(7696005)(26005)(6666004)(316002)(54906003)(1076003)(110136005)(2101003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 May 2023 18:06:22.8295 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f9f82251-35b1-4c73-4fff-08db50b81930 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: CO1NAM11FT084.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB8901 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, T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED 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?1765441514203622437?= X-GMAIL-MSGID: =?utf-8?q?1765441514203622437?= 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 | 40 ++++++++++++++++++++++++++++-------- 1 file changed, 32 insertions(+), 8 deletions(-) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 007bfe724a6a..d5758b67b6f3 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -444,9 +444,8 @@ 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; @@ -465,14 +464,37 @@ 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, policy->governor->flags); - cpufreq_freq_transition_end(policy, &freqs, false); + max_perf, fast_switch, policy->governor->flags); + + 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, @@ -675,9 +697,10 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy) * For shared memory system frequency update takes time that's why * do this in deferred kthread context. */ - if (boot_cpu_has(X86_FEATURE_CPPC)) + if (boot_cpu_has(X86_FEATURE_CPPC)) { current_pstate_driver->adjust_perf = amd_pstate_adjust_perf; - else + policy->fast_switch_possible = true; + } else current_pstate_driver->adjust_perf = NULL; ret = freq_qos_add_request(&policy->constraints, &cpudata->req[0], @@ -1313,6 +1336,7 @@ 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,