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Fri, 21 Jun 2024 16:51:34 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; 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 Received: from SATLEXMB04.amd.com (165.204.84.17) by SJ5PEPF000001F6.mail.protection.outlook.com (10.167.242.74) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7677.15 via Frontend Transport; Fri, 21 Jun 2024 16:51:33 +0000 Received: from pyuan-Chachani-VN.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Fri, 21 Jun 2024 11:51:30 -0500 From: Perry Yuan To: , , , CC: , , , , , Subject: [PATCH v13 5/9] cpufreq: amd-pstate: implement cpb_boost sysfs entry for boost control Date: Sat, 22 Jun 2024 00:51:00 +0800 Message-ID: X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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: SJ5PEPF000001F6:EE_|MW6PR12MB8663:EE_ X-MS-Office365-Filtering-Correlation-Id: ce25c3fe-b93c-4d3c-f3b0-08dc9212688d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230037|1800799021|82310400023|36860700010|376011; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Jun 2024 16:51:33.9561 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ce25c3fe-b93c-4d3c-f3b0-08dc9212688d 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: SJ5PEPF000001F6.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW6PR12MB8663 From: Perry Yuan With this new sysfs entry `cpb_boost` created, user can change CPU boost state dynamically under `active`, `guided` and `passive` modes. And the highest perf and frequency will also be updated as the boost state changes. Check current boost state: $ cat /sys/devices/system/cpu/amd_pstate/cpb_boost enabled or $ cat /sys/devices/system/cpu/amd_pstate/cpb_boost disabled Disable CPU boost sudo bash -c "echo "disabled" > /sys/devices/system/cpu/amd_pstate/cpb_boost" Enable CPU boost sudo bash -c "echo "enabled" > /sys/devices/system/cpu/amd_pstate/cpb_boost" Link: https://bugzilla.kernel.org/show_bug.cgi?id=217931 Link: https://bugzilla.kernel.org/show_bug.cgi?id=217618 Signed-off-by: Perry Yuan --- drivers/cpufreq/amd-pstate-ut.c | 2 +- drivers/cpufreq/amd-pstate.c | 129 +++++++++++++++++++++++++++++++- drivers/cpufreq/amd-pstate.h | 1 + 3 files changed, 130 insertions(+), 2 deletions(-) diff --git a/drivers/cpufreq/amd-pstate-ut.c b/drivers/cpufreq/amd-pstate-ut.c index fc275d41d51e..b528f198f4c3 100644 --- a/drivers/cpufreq/amd-pstate-ut.c +++ b/drivers/cpufreq/amd-pstate-ut.c @@ -227,7 +227,7 @@ static void amd_pstate_ut_check_freq(u32 index) goto skip_test; } - if (cpudata->boost_supported) { + if (amd_pstate_global_params.cpb_boost) { if ((policy->max == cpudata->max_freq) || (policy->max == cpudata->nominal_freq)) amd_pstate_ut_cases[index].result = AMD_PSTATE_UT_RESULT_PASS; diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index d3e7f9cfa5c8..6710b3c28cda 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -97,6 +97,7 @@ static struct quirk_entry *quirks; /* export the amd_pstate_global_params for unit test */ struct amd_pstate_global_params amd_pstate_global_params; EXPORT_SYMBOL_GPL(amd_pstate_global_params); +static int amd_pstate_cpu_boost(int cpu, bool state); /* * AMD Energy Preference Performance (EPP) @@ -139,6 +140,16 @@ static unsigned int epp_values[] = { [EPP_INDEX_POWERSAVE] = AMD_CPPC_EPP_POWERSAVE, }; +enum CPB_STATE_INDEX { + CPB_STATE_DISABLED = 0, + CPB_STATE_ENABLED = 1, +}; + +static const char * const cpb_state[] = { + [CPB_STATE_DISABLED] = "disabled", + [CPB_STATE_ENABLED] = "enabled", +}; + typedef int (*cppc_mode_transition_fn)(int); static struct quirk_entry quirk_amd_7k62 = { @@ -734,6 +745,7 @@ static int amd_pstate_init_boost_support(struct amd_cpudata *cpudata) if (amd_pstate_global_params.cpb_supported) { current_pstate_driver->boost_enabled = true; cpudata->boost_supported = true; + cpudata->boost_state = true; } amd_pstate_global_params.cpb_boost = amd_pstate_global_params.cpb_supported; @@ -741,6 +753,7 @@ static int amd_pstate_init_boost_support(struct amd_cpudata *cpudata) exit_err: cpudata->boost_supported = false; + cpudata->boost_state = false; current_pstate_driver->boost_enabled = false; amd_pstate_global_params.cpb_boost = false; return ret; @@ -1352,6 +1365,118 @@ static ssize_t prefcore_show(struct device *dev, return sysfs_emit(buf, "%s\n", str_enabled_disabled(amd_pstate_prefcore)); } +static int amd_pstate_cpu_boost_update(struct cpufreq_policy *policy, bool on) +{ + struct amd_cpudata *cpudata = policy->driver_data; + struct cppc_perf_ctrls perf_ctrls; + u32 highest_perf, nominal_perf, nominal_freq, max_freq; + int ret; + + highest_perf = READ_ONCE(cpudata->highest_perf); + nominal_perf = READ_ONCE(cpudata->nominal_perf); + nominal_freq = READ_ONCE(cpudata->nominal_freq); + max_freq = READ_ONCE(cpudata->max_freq); + + if (boot_cpu_has(X86_FEATURE_CPPC)) { + u64 value = READ_ONCE(cpudata->cppc_req_cached); + + value &= ~GENMASK_ULL(7, 0); + value |= on ? highest_perf : nominal_perf; + WRITE_ONCE(cpudata->cppc_req_cached, value); + + wrmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, value); + } else { + perf_ctrls.max_perf = on ? highest_perf : nominal_perf; + ret = cppc_set_perf(cpudata->cpu, &perf_ctrls); + if (ret) { + cpufreq_cpu_release(policy); + pr_debug("Failed to set max perf on CPU:%d. ret:%d\n", + cpudata->cpu, ret); + return ret; + } + } + + if (on) + policy->cpuinfo.max_freq = max_freq; + else + policy->cpuinfo.max_freq = nominal_freq * 1000; + + policy->max = policy->cpuinfo.max_freq; + + if (cppc_state == AMD_PSTATE_PASSIVE) { + ret = freq_qos_update_request(&cpudata->req[1], policy->cpuinfo.max_freq); + if (ret < 0) + pr_debug("Failed to update freq constraint: CPU%d\n", cpudata->cpu); + } + + return ret < 0 ? ret : 0; +} + +static int amd_pstate_cpu_boost(int cpu, bool state) +{ + int ret; + struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); + struct amd_cpudata *cpudata = policy->driver_data; + + if (!policy) { + pr_err("policy is NULL\n"); + ret = -ENODATA; + goto err_exit; + } + + ret = amd_pstate_cpu_boost_update(policy, state); + refresh_frequency_limits(policy); + WRITE_ONCE(cpudata->boost_state, state); + policy->boost_enabled = state; + +err_exit: + cpufreq_cpu_put(policy); + return ret < 0 ? ret : 0; +} + +static ssize_t cpb_boost_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + bool cpb_idx; + + cpb_idx = amd_pstate_global_params.cpb_boost; + + return sysfs_emit(buf, "%s\n", cpb_state[cpb_idx]); +} + +static ssize_t cpb_boost_store(struct device *dev, struct device_attribute *b, + const char *buf, size_t count) +{ + bool new_state; + ssize_t ret; + int cpu, cpb_idx; + + if (!amd_pstate_global_params.cpb_supported) { + pr_err("Boost mode is not supported by this processor or SBIOS\n"); + return -EINVAL; + } + + cpb_idx = sysfs_match_string(cpb_state, buf); + if (cpb_idx < 0) + return -EINVAL; + + new_state = cpb_idx; + + mutex_lock(&amd_pstate_driver_lock); + for_each_present_cpu(cpu) { + ret = amd_pstate_cpu_boost(cpu, new_state); + if (ret < 0) { + pr_warn("failed to update cpu boost for CPU%d (%zd)\n", cpu, ret); + goto err_exit; + } + } + amd_pstate_global_params.cpb_boost = !!new_state; + +err_exit: + mutex_unlock(&amd_pstate_driver_lock); + return ret < 0 ? ret : count; +} + cpufreq_freq_attr_ro(amd_pstate_max_freq); cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq); @@ -1362,6 +1487,7 @@ cpufreq_freq_attr_rw(energy_performance_preference); cpufreq_freq_attr_ro(energy_performance_available_preferences); static DEVICE_ATTR_RW(status); static DEVICE_ATTR_RO(prefcore); +static DEVICE_ATTR_RW(cpb_boost); static struct freq_attr *amd_pstate_attr[] = { &amd_pstate_max_freq, @@ -1386,6 +1512,7 @@ static struct freq_attr *amd_pstate_epp_attr[] = { static struct attribute *pstate_global_attributes[] = { &dev_attr_status.attr, &dev_attr_prefcore.attr, + &dev_attr_cpb_boost.attr, NULL }; @@ -1424,7 +1551,7 @@ static int amd_pstate_init_boost(struct cpufreq_policy *policy) if (ret) return ret; - policy->boost_enabled = READ_ONCE(cpudata->boost_supported); + policy->boost_enabled = READ_ONCE(cpudata->boost_state); return 0; } diff --git a/drivers/cpufreq/amd-pstate.h b/drivers/cpufreq/amd-pstate.h index 133042370a8f..fb240a870289 100644 --- a/drivers/cpufreq/amd-pstate.h +++ b/drivers/cpufreq/amd-pstate.h @@ -100,6 +100,7 @@ struct amd_cpudata { u64 cppc_cap1_cached; bool suspended; s16 epp_default; + bool boost_state; }; /**