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Thu, 10 Nov 2022 11:59:23 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , , Perry Yuan Subject: [PATCH v4 4/9] cpufreq: amd_pstate: implement Pstate EPP support for the AMD processors Date: Fri, 11 Nov 2022 01:58:42 +0800 Message-ID: <20221110175847.3098728-5-Perry.Yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221110175847.3098728-1-Perry.Yuan@amd.com> References: <20221110175847.3098728-1-Perry.Yuan@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] 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: BN8NAM11FT038:EE_|DS7PR12MB6023:EE_ X-MS-Office365-Filtering-Correlation-Id: 1a680f37-fbab-43f8-dbee-08dac3454f1d 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)(136003)(346002)(376002)(396003)(451199015)(36840700001)(40470700004)(46966006)(36860700001)(83380400001)(8936002)(86362001)(478600001)(356005)(81166007)(54906003)(5660300002)(82740400003)(40480700001)(70206006)(6666004)(70586007)(8676002)(316002)(2906002)(186003)(2616005)(426003)(30864003)(26005)(47076005)(1076003)(16526019)(7696005)(40460700003)(110136005)(82310400005)(4326008)(336012)(41300700001)(36756003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Nov 2022 17:59:27.3550 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1a680f37-fbab-43f8-dbee-08dac3454f1d 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: BN8NAM11FT038.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB6023 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 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1749133505652186176?= X-GMAIL-MSGID: =?utf-8?q?1749133505652186176?= 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 Signed-off-by: Perry Yuan --- drivers/cpufreq/amd-pstate.c | 652 ++++++++++++++++++++++++++++++++++- include/linux/amd-pstate.h | 81 +++++ 2 files changed, 726 insertions(+), 7 deletions(-) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 85a0b3fb56c2..7b3a12772582 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -60,8 +60,131 @@ * module parameter to be able to enable it manually for debugging. */ static bool shared_mem __read_mostly; +static int cppc_active __read_mostly; +static int cppc_load __initdata; +static int epp_off __initdata; -static struct cpufreq_driver amd_pstate_driver; +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; +struct kobject *amd_pstate_kobj; + +#ifdef CONFIG_ACPI_CPPC_LIB +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; +} +#endif + +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 AMD_CPPC_EPP_PERFORMANCE: + index = EPP_INDEX_PERFORMANCE; + break; + case AMD_CPPC_EPP_BALANCE_PERFORMANCE: + index = EPP_INDEX_BALANCE_PERFORMANCE; + break; + case AMD_CPPC_EPP_BALANCE_POWERSAVE: + index = EPP_INDEX_BALANCE_POWERSAVE; + break; + case AMD_CPPC_EPP_POWERSAVE: + index = EPP_INDEX_POWERSAVE; + break; + default: + break; + } + + return index; +} + +#ifdef CONFIG_ACPI_CPPC_LIB +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; +} +#endif static inline int pstate_enable(bool enable) { @@ -71,11 +194,21 @@ 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 +551,7 @@ 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 int amd_pstate_cpu_init(struct cpufreq_policy *policy) @@ -582,10 +715,62 @@ 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 ret = 0; + + while (energy_perf_strings[i] != NULL) + ret += sprintf(&buf[ret], "%s ", energy_perf_strings[i++]); + + ret += sprintf(&buf[ret], "\n"); + + return ret; +} + +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; + u32 epp = 0; + + 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 sprintf(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, @@ -594,6 +779,415 @@ 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 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; + } + 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 (!shared_mem && 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_safe_on_cpu(cpudata->cpu, 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_safe_on_cpu(cpudata->cpu, 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; + int ret; + + 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); + ret = wrmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, value); + if (!ret) + cpudata->epp_cached = 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); + } + + if (boot_cpu_has(X86_FEATURE_CPPC)) + amd_pstate_epp_init(policy->cpu); + + mutex_unlock(&amd_pstate_limits_lock); + } + + 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, @@ -607,8 +1201,20 @@ 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) @@ -623,19 +1229,37 @@ static int __init amd_pstate_init(void) if (cpufreq_get_current_driver()) return -EEXIST; + /* set the pstate driver disabled by default if there + * is no early parameters set + */ + if (!cppc_load) { + pr_debug("disabled to load\n"); + return -ENODEV; + } + + if (!epp_off) { + WRITE_ONCE(cppc_active, 1); + if (!default_pstate_driver) + default_pstate_driver = &amd_pstate_epp_driver; + } + /* 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 if (shared_mem) { static_call_update(amd_pstate_enable, cppc_enable); static_call_update(amd_pstate_init_perf, cppc_init_perf); static_call_update(amd_pstate_update_perf, cppc_update_perf); } else { - pr_info("This processor supports shared memory solution, you can enable it with amd_pstate.shared_mem=1\n"); + pr_info("This processor supports shared memory solution, enable it with amd_pstate=legacy_cppc\n"); return -ENODEV; } + 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) { @@ -643,9 +1267,9 @@ 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; @@ -657,6 +1281,20 @@ static int __init amd_pstate_param(char *str) if (!str) return -EINVAL; + /* + * Disable amd-pstate driver by default for now + * append amd-pstate=active or amd-pstate=active + * to enable driver loaded + */ + if (!strcmp(str, "active")) { + cppc_load = 1; + default_pstate_driver = &amd_pstate_epp_driver; + } else if (!strcmp(str, "passive")) { + epp_off = 1; + cppc_load = 1; + default_pstate_driver = &amd_pstate_driver; + } + /* * support shared memory type CPPC which has no MSR function. * enable amd-pstate on processors with shared memory solution diff --git a/include/linux/amd-pstate.h b/include/linux/amd-pstate.h index 1c4b8659f171..7e6e8cab97b3 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 +85,74 @@ 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; +}; + +#define AMD_CPPC_EPP_PERFORMANCE 0x00 +#define AMD_CPPC_EPP_BALANCE_PERFORMANCE 0x80 +#define AMD_CPPC_EPP_BALANCE_POWERSAVE 0xBF +#define AMD_CPPC_EPP_POWERSAVE 0xFF + +/* + * AMD Energy Preference Performance (EPP) + * The EPP is used in the CCLK DPM controller to drive + * the frequency that a core is going to operate during + * short periods of activity. EPP values will be utilized for + * different OS profiles (balanced, performance, power savings) + * display strings corresponding to EPP index in the + * energy_perf_strings[] + * index String + *------------------------------------- + * 0 default + * 1 performance + * 2 balance_performance + * 3 balance_power + * 4 power + */ +enum energy_perf_value_index { + EPP_INDEX_DEFAULT = 0, + EPP_INDEX_PERFORMANCE, + EPP_INDEX_BALANCE_PERFORMANCE, + EPP_INDEX_BALANCE_POWERSAVE, + EPP_INDEX_POWERSAVE, +}; + +static const char * const energy_perf_strings[] = { + [EPP_INDEX_DEFAULT] = "default", + [EPP_INDEX_PERFORMANCE] = "performance", + [EPP_INDEX_BALANCE_PERFORMANCE] = "balance_performance", + [EPP_INDEX_BALANCE_POWERSAVE] = "balance_power", + [EPP_INDEX_POWERSAVE] = "power", + NULL +}; + +static unsigned int epp_values[] = { + [EPP_INDEX_DEFAULT] = 0, + [EPP_INDEX_PERFORMANCE] = AMD_CPPC_EPP_PERFORMANCE, + [EPP_INDEX_BALANCE_PERFORMANCE] = AMD_CPPC_EPP_BALANCE_PERFORMANCE, + [EPP_INDEX_BALANCE_POWERSAVE] = AMD_CPPC_EPP_BALANCE_POWERSAVE, + [EPP_INDEX_POWERSAVE] = AMD_CPPC_EPP_POWERSAVE, }; #endif /* _LINUX_AMD_PSTATE_H */