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Thu, 8 Dec 2022 05:19:24 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , Subject: [PATCH v7 05/13] cpufreq: amd-pstate: implement Pstate EPP support for the AMD processors Date: Thu, 8 Dec 2022 19:18:44 +0800 Message-ID: <20221208111852.386731-6-perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221208111852.386731-1-perry.yuan@amd.com> References: <20221208111852.386731-1-perry.yuan@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-TrafficTypeDiagnostic: DM6NAM11FT016:EE_|SN7PR12MB7105:EE_ X-MS-Office365-Filtering-Correlation-Id: 01c8cd9d-a1af-4e39-8bdc-08dad90e1269 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:(13230022)(4636009)(39860400002)(346002)(136003)(376002)(396003)(451199015)(40470700004)(36840700001)(46966006)(44832011)(316002)(30864003)(54906003)(41300700001)(110136005)(70206006)(70586007)(8676002)(36756003)(4326008)(47076005)(83380400001)(5660300002)(8936002)(186003)(2616005)(356005)(16526019)(1076003)(81166007)(336012)(36860700001)(40460700003)(478600001)(40480700001)(86362001)(426003)(82310400005)(82740400003)(26005)(6666004)(7696005)(2906002)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Dec 2022 11:19:28.7241 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 01c8cd9d-a1af-4e39-8bdc-08dad90e1269 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: DM6NAM11FT016.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7105 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS autolearn=ham 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 From: Perry Yuan Add EPP driver support for AMD SoCs which support a dedicated MSR for CPPC. EPP is used by the DPM controller to configure the frequency that a core operates at during short periods of activity. The SoC EPP targets are configured on a scale from 0 to 255 where 0 represents maximum performance and 255 represents maximum efficiency. The amd-pstate driver exports profile string names to userspace that are tied to specific EPP values. The balance_performance string (0x80) provides the best balance for efficiency versus power on most systems, but users can choose other strings to meet their needs as well. $ cat /sys/devices/system/cpu/cpufreq/policy0/energy_performance_available_preferences default performance balance_performance balance_power power $ cat /sys/devices/system/cpu/cpufreq/policy0/energy_performance_preference balance_performance To enable the driver,it needs to add `amd_pstate=active` to kernel command line and kernel will load the active mode epp driver Signed-off-by: Perry Yuan --- drivers/cpufreq/amd-pstate.c | 631 ++++++++++++++++++++++++++++++++++- include/linux/amd-pstate.h | 35 ++ 2 files changed, 660 insertions(+), 6 deletions(-) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index c17bd845f5fc..0a521be1be8a 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -37,6 +37,7 @@ #include #include #include +#include #include #include @@ -59,9 +60,125 @@ * we disable it by default to go acpi-cpufreq on these processors and add a * module parameter to be able to enable it manually for debugging. */ -static struct cpufreq_driver amd_pstate_driver; +static bool cppc_active; static int cppc_load __initdata; +static struct cpufreq_driver *default_pstate_driver; +static struct amd_cpudata **all_cpu_data; +static struct amd_pstate_params global_params; + +static DEFINE_MUTEX(amd_pstate_limits_lock); +static DEFINE_MUTEX(amd_pstate_driver_lock); + +static bool cppc_boost __read_mostly; + +static s16 amd_pstate_get_epp(struct amd_cpudata *cpudata, u64 cppc_req_cached) +{ + s16 epp; + struct cppc_perf_caps perf_caps; + int ret; + + if (boot_cpu_has(X86_FEATURE_CPPC)) { + if (!cppc_req_cached) { + epp = rdmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, + &cppc_req_cached); + if (epp) + return epp; + } + epp = (cppc_req_cached >> 24) & 0xFF; + } else { + ret = cppc_get_epp_caps(cpudata->cpu, &perf_caps); + if (ret < 0) { + pr_debug("Could not retrieve energy perf value (%d)\n", ret); + return -EIO; + } + epp = (s16) perf_caps.energy_perf; + } + + return epp; +} + +static int amd_pstate_get_energy_pref_index(struct amd_cpudata *cpudata) +{ + s16 epp; + int index = -EINVAL; + + epp = amd_pstate_get_epp(cpudata, 0); + if (epp < 0) + return epp; + + switch (epp) { + case HWP_EPP_PERFORMANCE: + index = EPP_INDEX_PERFORMANCE; + break; + case HWP_EPP_BALANCE_PERFORMANCE: + index = EPP_INDEX_BALANCE_PERFORMANCE; + break; + case HWP_EPP_BALANCE_POWERSAVE: + index = EPP_INDEX_BALANCE_POWERSAVE; + break; + case HWP_EPP_POWERSAVE: + index = EPP_INDEX_POWERSAVE; + break; + default: + break; + } + + return index; +} + +static int amd_pstate_set_epp(struct amd_cpudata *cpudata, u32 epp) +{ + int ret; + struct cppc_perf_ctrls perf_ctrls; + + if (boot_cpu_has(X86_FEATURE_CPPC)) { + u64 value = READ_ONCE(cpudata->cppc_req_cached); + + value &= ~GENMASK_ULL(31, 24); + value |= (u64)epp << 24; + WRITE_ONCE(cpudata->cppc_req_cached, value); + + ret = wrmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, value); + if (!ret) + cpudata->epp_cached = epp; + } else { + perf_ctrls.energy_perf = epp; + ret = cppc_set_epp_perf(cpudata->cpu, &perf_ctrls, 1); + if (ret) { + pr_debug("failed to set energy perf value (%d)\n", ret); + return ret; + } + cpudata->epp_cached = epp; + } + + return ret; +} + +static int amd_pstate_set_energy_pref_index(struct amd_cpudata *cpudata, + int pref_index) +{ + int epp = -EINVAL; + int ret; + + if (!pref_index) { + pr_debug("EPP pref_index is invalid\n"); + return -EINVAL; + } + + if (epp == -EINVAL) + epp = epp_values[pref_index]; + + if (epp > 0 && cpudata->policy == CPUFREQ_POLICY_PERFORMANCE) { + pr_debug("EPP cannot be set under performance policy\n"); + return -EBUSY; + } + + ret = amd_pstate_set_epp(cpudata, epp); + + return ret; +} + static inline int pstate_enable(bool enable) { return wrmsrl_safe(MSR_AMD_CPPC_ENABLE, enable); @@ -70,11 +187,21 @@ static inline int pstate_enable(bool enable) static int cppc_enable(bool enable) { int cpu, ret = 0; + struct cppc_perf_ctrls perf_ctrls; for_each_present_cpu(cpu) { ret = cppc_set_enable(cpu, enable); if (ret) return ret; + + /* Enable autonomous mode for EPP */ + if (!cppc_active) { + /* Set desired perf as zero to allow EPP firmware control */ + perf_ctrls.desired_perf = 0; + ret = cppc_set_perf(cpu, &perf_ctrls); + if (ret) + return ret; + } } return ret; @@ -418,7 +545,7 @@ static void amd_pstate_boost_init(struct amd_cpudata *cpudata) return; cpudata->boost_supported = true; - amd_pstate_driver.boost_enabled = true; + default_pstate_driver->boost_enabled = true; } static void amd_perf_ctl_reset(unsigned int cpu) @@ -592,10 +719,61 @@ static ssize_t show_amd_pstate_highest_perf(struct cpufreq_policy *policy, return sprintf(&buf[0], "%u\n", perf); } +static ssize_t show_energy_performance_available_preferences( + struct cpufreq_policy *policy, char *buf) +{ + int i = 0; + int offset = 0; + + while (energy_perf_strings[i] != NULL) + offset += sysfs_emit_at(buf, offset, "%s ", energy_perf_strings[i++]); + + sysfs_emit_at(buf, offset, "\n"); + + return offset; +} + +static ssize_t store_energy_performance_preference( + struct cpufreq_policy *policy, const char *buf, size_t count) +{ + struct amd_cpudata *cpudata = policy->driver_data; + char str_preference[21]; + ssize_t ret; + + ret = sscanf(buf, "%20s", str_preference); + if (ret != 1) + return -EINVAL; + + ret = match_string(energy_perf_strings, -1, str_preference); + if (ret < 0) + return -EINVAL; + + mutex_lock(&amd_pstate_limits_lock); + ret = amd_pstate_set_energy_pref_index(cpudata, ret); + mutex_unlock(&amd_pstate_limits_lock); + + return ret ?: count; +} + +static ssize_t show_energy_performance_preference( + struct cpufreq_policy *policy, char *buf) +{ + struct amd_cpudata *cpudata = policy->driver_data; + int preference; + + preference = amd_pstate_get_energy_pref_index(cpudata); + if (preference < 0) + return preference; + + return sysfs_emit(buf, "%s\n", energy_perf_strings[preference]); +} + cpufreq_freq_attr_ro(amd_pstate_max_freq); cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq); cpufreq_freq_attr_ro(amd_pstate_highest_perf); +cpufreq_freq_attr_rw(energy_performance_preference); +cpufreq_freq_attr_ro(energy_performance_available_preferences); static struct freq_attr *amd_pstate_attr[] = { &amd_pstate_max_freq, @@ -604,6 +782,424 @@ static struct freq_attr *amd_pstate_attr[] = { NULL, }; +static struct freq_attr *amd_pstate_epp_attr[] = { + &amd_pstate_max_freq, + &amd_pstate_lowest_nonlinear_freq, + &amd_pstate_highest_perf, + &energy_performance_preference, + &energy_performance_available_preferences, + NULL, +}; + +static inline void update_boost_state(void) +{ + u64 misc_en; + struct amd_cpudata *cpudata; + + cpudata = all_cpu_data[0]; + rdmsrl(MSR_K7_HWCR, misc_en); + global_params.cppc_boost_disabled = misc_en & BIT_ULL(25); +} + +static bool amd_pstate_acpi_pm_profile_server(void) +{ + if (acpi_gbl_FADT.preferred_profile == PM_ENTERPRISE_SERVER || + acpi_gbl_FADT.preferred_profile == PM_PERFORMANCE_SERVER) + return true; + + return false; +} + +static int amd_pstate_init_cpu(unsigned int cpunum) +{ + struct amd_cpudata *cpudata; + + cpudata = all_cpu_data[cpunum]; + if (!cpudata) { + cpudata = kzalloc(sizeof(*cpudata), GFP_KERNEL); + if (!cpudata) + return -ENOMEM; + WRITE_ONCE(all_cpu_data[cpunum], cpudata); + + cpudata->cpu = cpunum; + + if (cppc_active) { + if (amd_pstate_acpi_pm_profile_server()) + cppc_boost = true; + } + + } + cpudata->epp_powersave = -EINVAL; + cpudata->epp_policy = 0; + pr_debug("controlling: cpu %d\n", cpunum); + return 0; +} + +static int __amd_pstate_cpu_init(struct cpufreq_policy *policy) +{ + int min_freq, max_freq, nominal_freq, lowest_nonlinear_freq, ret; + struct amd_cpudata *cpudata; + struct device *dev; + int rc; + u64 value; + + rc = amd_pstate_init_cpu(policy->cpu); + if (rc) + return rc; + + cpudata = all_cpu_data[policy->cpu]; + + dev = get_cpu_device(policy->cpu); + if (!dev) + goto free_cpudata1; + + rc = amd_pstate_init_perf(cpudata); + if (rc) + goto free_cpudata1; + + min_freq = amd_get_min_freq(cpudata); + max_freq = amd_get_max_freq(cpudata); + nominal_freq = amd_get_nominal_freq(cpudata); + lowest_nonlinear_freq = amd_get_lowest_nonlinear_freq(cpudata); + if (min_freq < 0 || max_freq < 0 || min_freq > max_freq) { + dev_err(dev, "min_freq(%d) or max_freq(%d) value is incorrect\n", + min_freq, max_freq); + ret = -EINVAL; + goto free_cpudata1; + } + + policy->min = min_freq; + policy->max = max_freq; + + policy->cpuinfo.min_freq = min_freq; + policy->cpuinfo.max_freq = max_freq; + /* It will be updated by governor */ + policy->cur = policy->cpuinfo.min_freq; + + /* Initial processor data capability frequencies */ + cpudata->max_freq = max_freq; + cpudata->min_freq = min_freq; + cpudata->nominal_freq = nominal_freq; + cpudata->lowest_nonlinear_freq = lowest_nonlinear_freq; + + policy->driver_data = cpudata; + + update_boost_state(); + cpudata->epp_cached = amd_pstate_get_epp(cpudata, value); + + policy->min = policy->cpuinfo.min_freq; + policy->max = policy->cpuinfo.max_freq; + + if (boot_cpu_has(X86_FEATURE_CPPC)) + policy->fast_switch_possible = true; + + if (boot_cpu_has(X86_FEATURE_CPPC)) { + ret = rdmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, &value); + if (ret) + return ret; + WRITE_ONCE(cpudata->cppc_req_cached, value); + + ret = rdmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_CAP1, &value); + if (ret) + return ret; + WRITE_ONCE(cpudata->cppc_cap1_cached, value); + } + amd_pstate_boost_init(cpudata); + + return 0; + +free_cpudata1: + kfree(cpudata); + return ret; +} + +static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy) +{ + int ret; + + ret = __amd_pstate_cpu_init(policy); + if (ret) + return ret; + /* + * Set the policy to powersave to provide a valid fallback value in case + * the default cpufreq governor is neither powersave nor performance. + */ + policy->policy = CPUFREQ_POLICY_POWERSAVE; + + return 0; +} + +static int amd_pstate_epp_cpu_exit(struct cpufreq_policy *policy) +{ + pr_debug("CPU %d exiting\n", policy->cpu); + policy->fast_switch_possible = false; + return 0; +} + +static void amd_pstate_update_max_freq(unsigned int cpu) +{ + struct cpufreq_policy *policy = policy = cpufreq_cpu_get(cpu); + + if (!policy) + return; + + refresh_frequency_limits(policy); + cpufreq_cpu_put(policy); +} + +static void amd_pstate_epp_update_limits(unsigned int cpu) +{ + mutex_lock(&amd_pstate_driver_lock); + update_boost_state(); + if (global_params.cppc_boost_disabled) { + for_each_possible_cpu(cpu) + amd_pstate_update_max_freq(cpu); + } else { + cpufreq_update_policy(cpu); + } + mutex_unlock(&amd_pstate_driver_lock); +} + +static int cppc_boost_hold_time_ns = 3 * NSEC_PER_MSEC; + +static inline void amd_pstate_boost_up(struct amd_cpudata *cpudata) +{ + u64 hwp_req = READ_ONCE(cpudata->cppc_req_cached); + u64 hwp_cap = READ_ONCE(cpudata->cppc_cap1_cached); + u32 max_limit = (hwp_req & 0xff); + u32 min_limit = (hwp_req & 0xff00) >> 8; + u32 boost_level1; + + /* If max and min are equal or already at max, nothing to boost */ + if (max_limit == min_limit) + return; + + /* Set boost max and min to initial value */ + if (!cpudata->cppc_boost_min) + cpudata->cppc_boost_min = min_limit; + + boost_level1 = ((AMD_CPPC_NOMINAL_PERF(hwp_cap) + min_limit) >> 1); + + if (cpudata->cppc_boost_min < boost_level1) + cpudata->cppc_boost_min = boost_level1; + else if (cpudata->cppc_boost_min < AMD_CPPC_NOMINAL_PERF(hwp_cap)) + cpudata->cppc_boost_min = AMD_CPPC_NOMINAL_PERF(hwp_cap); + else if (cpudata->cppc_boost_min == AMD_CPPC_NOMINAL_PERF(hwp_cap)) + cpudata->cppc_boost_min = max_limit; + else + return; + + hwp_req &= ~AMD_CPPC_MIN_PERF(~0L); + hwp_req |= AMD_CPPC_MIN_PERF(cpudata->cppc_boost_min); + wrmsrl(MSR_AMD_CPPC_REQ, hwp_req); + cpudata->last_update = cpudata->sample.time; +} + +static inline void amd_pstate_boost_down(struct amd_cpudata *cpudata) +{ + bool expired; + + if (cpudata->cppc_boost_min) { + expired = time_after64(cpudata->sample.time, cpudata->last_update + + cppc_boost_hold_time_ns); + + if (expired) { + wrmsrl(MSR_AMD_CPPC_REQ, cpudata->cppc_req_cached); + cpudata->cppc_boost_min = 0; + } + } + + cpudata->last_update = cpudata->sample.time; +} + +static inline void amd_pstate_boost_update_util(struct amd_cpudata *cpudata, + u64 time) +{ + cpudata->sample.time = time; + if (smp_processor_id() != cpudata->cpu) + return; + + if (cpudata->sched_flags & SCHED_CPUFREQ_IOWAIT) { + bool do_io = false; + + cpudata->sched_flags = 0; + /* + * Set iowait_boost flag and update time. Since IO WAIT flag + * is set all the time, we can't just conclude that there is + * some IO bound activity is scheduled on this CPU with just + * one occurrence. If we receive at least two in two + * consecutive ticks, then we treat as boost candidate. + * This is leveraged from Intel Pstate driver. + */ + if (time_before64(time, cpudata->last_io_update + 2 * TICK_NSEC)) + do_io = true; + + cpudata->last_io_update = time; + + if (do_io) + amd_pstate_boost_up(cpudata); + + } else { + amd_pstate_boost_down(cpudata); + } +} + +static inline void amd_pstate_cppc_update_hook(struct update_util_data *data, + u64 time, unsigned int flags) +{ + struct amd_cpudata *cpudata = container_of(data, + struct amd_cpudata, update_util); + + cpudata->sched_flags |= flags; + + if (smp_processor_id() == cpudata->cpu) + amd_pstate_boost_update_util(cpudata, time); +} + +static void amd_pstate_clear_update_util_hook(unsigned int cpu) +{ + struct amd_cpudata *cpudata = all_cpu_data[cpu]; + + if (!cpudata->update_util_set) + return; + + cpufreq_remove_update_util_hook(cpu); + cpudata->update_util_set = false; + synchronize_rcu(); +} + +static void amd_pstate_set_update_util_hook(unsigned int cpu_num) +{ + struct amd_cpudata *cpudata = all_cpu_data[cpu_num]; + + if (!cppc_boost) { + if (cpudata->update_util_set) + amd_pstate_clear_update_util_hook(cpudata->cpu); + return; + } + + if (cpudata->update_util_set) + return; + + cpudata->sample.time = 0; + cpufreq_add_update_util_hook(cpu_num, &cpudata->update_util, + amd_pstate_cppc_update_hook); + cpudata->update_util_set = true; +} + +static void amd_pstate_epp_init(unsigned int cpu) +{ + struct amd_cpudata *cpudata = all_cpu_data[cpu]; + u32 max_perf, min_perf; + u64 value; + s16 epp; + + max_perf = READ_ONCE(cpudata->highest_perf); + min_perf = READ_ONCE(cpudata->lowest_perf); + + value = READ_ONCE(cpudata->cppc_req_cached); + + if (cpudata->policy == CPUFREQ_POLICY_PERFORMANCE) + min_perf = max_perf; + + /* Initial min/max values for CPPC Performance Controls Register */ + value &= ~AMD_CPPC_MIN_PERF(~0L); + value |= AMD_CPPC_MIN_PERF(min_perf); + + value &= ~AMD_CPPC_MAX_PERF(~0L); + value |= AMD_CPPC_MAX_PERF(max_perf); + + /* CPPC EPP feature require to set zero to the desire perf bit */ + value &= ~AMD_CPPC_DES_PERF(~0L); + value |= AMD_CPPC_DES_PERF(0); + + if (cpudata->epp_policy == cpudata->policy) + goto skip_epp; + + cpudata->epp_policy = cpudata->policy; + + if (cpudata->policy == CPUFREQ_POLICY_PERFORMANCE) { + epp = amd_pstate_get_epp(cpudata, value); + cpudata->epp_powersave = epp; + if (epp < 0) + goto skip_epp; + /* force the epp value to be zero for performance policy */ + epp = 0; + } else { + if (cpudata->epp_powersave < 0) + goto skip_epp; + /* Get BIOS pre-defined epp value */ + epp = amd_pstate_get_epp(cpudata, value); + if (epp) + goto skip_epp; + epp = cpudata->epp_powersave; + } + /* Set initial EPP value */ + if (boot_cpu_has(X86_FEATURE_CPPC)) { + value &= ~GENMASK_ULL(31, 24); + value |= (u64)epp << 24; + } + +skip_epp: + WRITE_ONCE(cpudata->cppc_req_cached, value); + amd_pstate_set_epp(cpudata, epp); +} + +static void amd_pstate_set_max_limits(struct amd_cpudata *cpudata) +{ + u64 hwp_cap = READ_ONCE(cpudata->cppc_cap1_cached); + u64 hwp_req = READ_ONCE(cpudata->cppc_req_cached); + u32 max_limit = (hwp_cap >> 24) & 0xff; + + hwp_req &= ~AMD_CPPC_MIN_PERF(~0L); + hwp_req |= AMD_CPPC_MIN_PERF(max_limit); + wrmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, hwp_req); +} + +static int amd_pstate_epp_set_policy(struct cpufreq_policy *policy) +{ + struct amd_cpudata *cpudata; + + if (!policy->cpuinfo.max_freq) + return -ENODEV; + + pr_debug("set_policy: cpuinfo.max %u policy->max %u\n", + policy->cpuinfo.max_freq, policy->max); + + cpudata = all_cpu_data[policy->cpu]; + cpudata->policy = policy->policy; + + if (boot_cpu_has(X86_FEATURE_CPPC)) { + mutex_lock(&amd_pstate_limits_lock); + + if (cpudata->policy == CPUFREQ_POLICY_PERFORMANCE) { + amd_pstate_clear_update_util_hook(policy->cpu); + amd_pstate_set_max_limits(cpudata); + } else { + amd_pstate_set_update_util_hook(policy->cpu); + } + + mutex_unlock(&amd_pstate_limits_lock); + } + amd_pstate_epp_init(policy->cpu); + + return 0; +} + +static void amd_pstate_verify_cpu_policy(struct amd_cpudata *cpudata, + struct cpufreq_policy_data *policy) +{ + update_boost_state(); + cpufreq_verify_within_cpu_limits(policy); +} + +static int amd_pstate_epp_verify_policy(struct cpufreq_policy_data *policy) +{ + amd_pstate_verify_cpu_policy(all_cpu_data[policy->cpu], policy); + pr_debug("policy_max =%d, policy_min=%d\n", policy->max, policy->min); + return 0; +} + static struct cpufreq_driver amd_pstate_driver = { .flags = CPUFREQ_CONST_LOOPS | CPUFREQ_NEED_UPDATE_LIMITS, .verify = amd_pstate_verify, @@ -617,8 +1213,20 @@ static struct cpufreq_driver amd_pstate_driver = { .attr = amd_pstate_attr, }; +static struct cpufreq_driver amd_pstate_epp_driver = { + .flags = CPUFREQ_CONST_LOOPS, + .verify = amd_pstate_epp_verify_policy, + .setpolicy = amd_pstate_epp_set_policy, + .init = amd_pstate_epp_cpu_init, + .exit = amd_pstate_epp_cpu_exit, + .update_limits = amd_pstate_epp_update_limits, + .name = "amd_pstate_epp", + .attr = amd_pstate_epp_attr, +}; + static int __init amd_pstate_init(void) { + static struct amd_cpudata **cpudata; int ret; if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) @@ -645,7 +1253,8 @@ 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"); - amd_pstate_driver.adjust_perf = amd_pstate_adjust_perf; + if (!cppc_active) + default_pstate_driver->adjust_perf = amd_pstate_adjust_perf; } else { pr_debug("AMD CPPC shared memory based functionality is supported\n"); static_call_update(amd_pstate_enable, cppc_enable); @@ -653,6 +1262,10 @@ static int __init amd_pstate_init(void) static_call_update(amd_pstate_update_perf, cppc_update_perf); } + cpudata = vzalloc(array_size(sizeof(void *), num_possible_cpus())); + if (!cpudata) + return -ENOMEM; + WRITE_ONCE(all_cpu_data, cpudata); /* enable amd pstate feature */ ret = amd_pstate_enable(true); if (ret) { @@ -660,9 +1273,9 @@ static int __init amd_pstate_init(void) return ret; } - ret = cpufreq_register_driver(&amd_pstate_driver); + ret = cpufreq_register_driver(default_pstate_driver); if (ret) - pr_err("failed to register amd_pstate_driver with return %d\n", + pr_err("failed to register amd pstate driver with return %d\n", ret); return ret; @@ -677,8 +1290,14 @@ static int __init amd_pstate_param(char *str) if (!strcmp(str, "disable")) { cppc_load = 0; pr_info("driver is explicitly disabled\n"); - } else if (!strcmp(str, "passive")) + } else if (!strcmp(str, "passive")) { cppc_load = 1; + default_pstate_driver = &amd_pstate_driver; + } else if (!strcmp(str, "active")) { + cppc_active = 1; + cppc_load = 1; + default_pstate_driver = &amd_pstate_epp_driver; + } return 0; } diff --git a/include/linux/amd-pstate.h b/include/linux/amd-pstate.h index 1c4b8659f171..888af62040f1 100644 --- a/include/linux/amd-pstate.h +++ b/include/linux/amd-pstate.h @@ -25,6 +25,7 @@ struct amd_aperf_mperf { u64 aperf; u64 mperf; u64 tsc; + u64 time; }; /** @@ -47,6 +48,18 @@ struct amd_aperf_mperf { * @prev: Last Aperf/Mperf/tsc count value read from register * @freq: current cpu frequency value * @boost_supported: check whether the Processor or SBIOS supports boost mode + * @epp_powersave: Last saved CPPC energy performance preference + when policy switched to performance + * @epp_policy: Last saved policy used to set energy-performance preference + * @epp_cached: Cached CPPC energy-performance preference value + * @policy: Cpufreq policy value + * @sched_flags: Store scheduler flags for possible cross CPU update + * @update_util_set: CPUFreq utility callback is set + * @last_update: Time stamp of the last performance state update + * @cppc_boost_min: Last CPPC boosted min performance state + * @cppc_cap1_cached: Cached value of the last CPPC Capabilities MSR + * @update_util: Cpufreq utility callback information + * @sample: the stored performance sample * * The amd_cpudata is key private data for each CPU thread in AMD P-State, and * represents all the attributes and goals that AMD P-State requests at runtime. @@ -72,6 +85,28 @@ struct amd_cpudata { u64 freq; bool boost_supported; + + /* EPP feature related attributes*/ + s16 epp_powersave; + s16 epp_policy; + s16 epp_cached; + u32 policy; + u32 sched_flags; + bool update_util_set; + u64 last_update; + u64 last_io_update; + u32 cppc_boost_min; + u64 cppc_cap1_cached; + struct update_util_data update_util; + struct amd_aperf_mperf sample; +}; + +/** + * struct amd_pstate_params - global parameters for the performance control + * @ cppc_boost_disabled wheher the core performance boost disabled + */ +struct amd_pstate_params { + bool cppc_boost_disabled; }; #endif /* _LINUX_AMD_PSTATE_H */ -- 2.34.1