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Wed, 27 May 2026 12:46:35 -0700 From: Sumit Gupta To: , , , , , , , , , , , CC: , , , , , , , , Mario Limonciello Subject: [PATCH v4 1/2] ACPI: CPPC: Add support for CPPC v4 Date: Thu, 28 May 2026 01:16:25 +0530 Message-ID: <20260527194626.185286-2-sumitg@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260527194626.185286-1-sumitg@nvidia.com> References: <20260527194626.185286-1-sumitg@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF00012E64:EE_|BY5PR12MB4193:EE_ X-MS-Office365-Filtering-Correlation-Id: 447c991d-da8f-4d0f-320c-08debc28bd31 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|7416014|376014|82310400026|1800799024|11063799006|3023799007|22082099003|18002099003|56012099006|921020; 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charset="utf-8" CPPC v4 (ACPI 6.6, Section 8.4.6) adds two optional entries to the _CPC package: 1. OSPM Nominal Performance (8.4.6.1.2.6): A write-only register that lets OSPM inform the platform what it considers nominal performance. The platform classifies performance above this level as boost and below as throttle for its power/thermal decisions. 2. Resource Priority (8.4.6.1.2.7): A Package of Resource Priority Register Descriptor sub-packages that allow OSPM to set relative priority among processors for shared resources (boost, throttle, L2/L3 cache, memory bandwidth). Parsing the full structure is not yet supported; such entries are marked as unsupported. Add v4 _CPC table parsing (25 entries) and update REG_OPTIONAL to mark the two new registers as optional. Signed-off-by: Sumit Gupta Reviewed-by: Mario Limonciello (AMD) Reviewed-by: Pierre Gondois --- drivers/acpi/cppc_acpi.c | 23 +++++++++++++++++------ include/acpi/cppc_acpi.h | 8 ++++++-- 2 files changed, 23 insertions(+), 8 deletions(-) diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index f370be8715ae..c76cfafa3589 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -134,7 +134,7 @@ static DEFINE_PER_CPU(struct cpc_desc *, cpc_desc_ptr); * cpc_regs[] with the corresponding index. 0 means mandatory and 1 * means optional. */ -#define REG_OPTIONAL (0x1FC7D0) +#define REG_OPTIONAL (0x7FC7D0) =20 /* * Use the index of the register in per-cpu cpc_regs[] to check if @@ -751,18 +751,19 @@ int acpi_cppc_processor_probe(struct acpi_processor *= pr) /* * Disregard _CPC if the number of entries in the return package is not * as expected, but support future revisions being proper supersets of - * the v3 and only causing more entries to be returned by _CPC. + * the v4 and only causing more entries to be returned by _CPC. */ if ((cpc_rev =3D=3D CPPC_V2_REV && num_ent !=3D CPPC_V2_NUM_ENT) || (cpc_rev =3D=3D CPPC_V3_REV && num_ent !=3D CPPC_V3_NUM_ENT) || - (cpc_rev > CPPC_V3_REV && num_ent <=3D CPPC_V3_NUM_ENT)) { + (cpc_rev =3D=3D CPPC_V4_REV && num_ent !=3D CPPC_V4_NUM_ENT) || + (cpc_rev > CPPC_V4_REV && num_ent <=3D CPPC_V4_NUM_ENT)) { pr_debug("Unexpected number of _CPC return package entries (%d) for CPU:= %d\n", num_ent, pr->id); goto out_free; } - if (cpc_rev > CPPC_V3_REV) { - num_ent =3D CPPC_V3_NUM_ENT; - cpc_rev =3D CPPC_V3_REV; + if (cpc_rev > CPPC_V4_REV) { + num_ent =3D CPPC_V4_NUM_ENT; + cpc_rev =3D CPPC_V4_REV; } =20 cpc_ptr->num_entries =3D num_ent; @@ -845,6 +846,16 @@ int acpi_cppc_processor_probe(struct acpi_processor *p= r) =20 cpc_ptr->cpc_regs[i-2].type =3D ACPI_TYPE_BUFFER; memcpy(&cpc_ptr->cpc_regs[i-2].cpc_entry.reg, gas_t, sizeof(*gas_t)); + } else if (cpc_obj->type =3D=3D ACPI_TYPE_PACKAGE && (i - 2) =3D=3D RESO= URCE_PRIORITY) { + /* + * ACPI 6.6, s8.4.6.1.2.7 defines Resource Priority as a + * Package of Resource Priority Register Descriptor sub-packages. + * Parsing the full structure is not yet supported. + * Mark the register as unsupported for now. + */ + pr_debug("CPU:%d Resource Priority not supported\n", pr->id); + cpc_ptr->cpc_regs[i-2].type =3D ACPI_TYPE_INTEGER; + cpc_ptr->cpc_regs[i-2].cpc_entry.int_value =3D 0; } else { pr_debug("Invalid entry type (%d) in _CPC for CPU:%d\n", i, pr->id); diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h index ee8352830c32..9b18fb9aab7c 100644 --- a/include/acpi/cppc_acpi.h +++ b/include/acpi/cppc_acpi.h @@ -17,16 +17,18 @@ #include #include =20 -/* CPPCv2 and CPPCv3 support */ +/* CPPCv2, CPPCv3 and CPPCv4 support */ #define CPPC_V2_REV 2 #define CPPC_V3_REV 3 +#define CPPC_V4_REV 4 #define CPPC_V2_NUM_ENT 21 #define CPPC_V3_NUM_ENT 23 +#define CPPC_V4_NUM_ENT 25 =20 #define PCC_CMD_COMPLETE_MASK (1 << 0) #define PCC_ERROR_MASK (1 << 2) =20 -#define MAX_CPC_REG_ENT 21 +#define MAX_CPC_REG_ENT 23 =20 /* CPPC specific PCC commands. */ #define CMD_READ 0 @@ -110,6 +112,8 @@ enum cppc_regs { REFERENCE_PERF, LOWEST_FREQ, NOMINAL_FREQ, + OSPM_NOMINAL_PERF, + RESOURCE_PRIORITY, }; =20 /* --=20 2.34.1 From nobody Mon Jun 8 17:38:05 2026 Received: from BL0PR03CU003.outbound.protection.outlook.com (mail-eastusazon11012036.outbound.protection.outlook.com [52.101.53.36]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B809430CD82; 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charset="utf-8" Expose the OSPM Nominal Performance register (ACPI 6.6, Section 8.4.6.1.2.6), which conveys the desired nominal performance level at which the platform may run. Unlike the existing read-only Nominal Performance register, it is writable and lets OSPM request a lower nominal level than the platform-reported nominal. The platform classifies performance above this level as boosted and below as throttled for its power/thermal decisions. It is exposed as a per-policy cpufreq sysfs attribute in kHz, to match the cpufreq sysfs unit convention: /sys/devices/system/cpu/cpufreq/policyN/ospm_nominal_freq The attribute is documented in Documentation/ABI/testing/sysfs-devices-system-cpu. Writes are converted to perf via cppc_khz_to_perf(), validated against [Lowest Performance, Nominal Performance], and applied to every CPU in policy->cpus. The register is write-only; the kernel caches the last written value in struct cppc_cpudata for sysfs readback (returns 0 until userspace writes a value). Signed-off-by: Sumit Gupta --- .../ABI/testing/sysfs-devices-system-cpu | 17 ++++++ drivers/acpi/cppc_acpi.c | 35 +++++++++++ drivers/cpufreq/cppc_cpufreq.c | 60 +++++++++++++++++++ include/acpi/cppc_acpi.h | 12 ++++ 4 files changed, 124 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documenta= tion/ABI/testing/sysfs-devices-system-cpu index 82d10d556cc8..ac1bf1b89ac4 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -346,6 +346,23 @@ Description: Performance Limited =20 This file is only present if the cppc-cpufreq driver is in use. =20 +What: /sys/devices/system/cpu/cpuX/cpufreq/ospm_nominal_freq +Date: May 2026 +Contact: linux-pm@vger.kernel.org +Description: OSPM Nominal Performance (kHz) + + OSPM uses this attribute to request a nominal performance + level lower than the platform-reported nominal. The + platform treats performance above this level as boost + and below as throttle for power and thermal decisions. + + Read returns the last written value in kHz, or 0 if no + value has been written. Write a kHz value in the range + [lowest_freq, nominal_freq]. + + This file is only present if the cppc-cpufreq driver is + in use. + What: /sys/devices/system/cpu/cpu*/cache/index3/cache_disable_{0,1} Date: August 2008 KernelVersion: 2.6.27 diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index c76cfafa3589..ad6ece16c30d 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -1682,6 +1682,41 @@ int cppc_set_epp(int cpu, u64 epp_val) } EXPORT_SYMBOL_GPL(cppc_set_epp); =20 +/** + * cppc_set_ospm_nominal_perf() - Write OSPM Nominal Performance register. + * @cpu: CPU on which to write register. + * @ospm_nominal_perf: Value to write to the OSPM Nominal Performance regi= ster. + * + * OSPM Nominal Performance conveys the desired nominal performance level + * at which the platform may run. Per ACPI 6.6, s8.4.6.1.2.6, the value + * must lie within [Lowest Performance, Nominal Performance] and may be + * set independently of Minimum, Maximum and Desired performance. + * + * Return: 0 on success or negative error code. + */ +int cppc_set_ospm_nominal_perf(int cpu, u64 ospm_nominal_perf) +{ + struct cpc_desc *cpc_desc =3D per_cpu(cpc_desc_ptr, cpu); + struct cppc_perf_caps caps; + int ret; + + if (!cpc_desc) { + pr_debug("No CPC descriptor for CPU:%d\n", cpu); + return -ENODEV; + } + + ret =3D cppc_get_perf_caps(cpu, &caps); + if (ret) + return ret; + + if (ospm_nominal_perf < caps.lowest_perf || + ospm_nominal_perf > caps.nominal_perf) + return -EINVAL; + + return cppc_set_reg_val(cpu, OSPM_NOMINAL_PERF, ospm_nominal_perf); +} +EXPORT_SYMBOL_GPL(cppc_set_ospm_nominal_perf); + /** * cppc_get_auto_act_window() - Read autonomous activity window register. * @cpu: CPU from which to read register. diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c index 15a728dea911..5c54af1655b5 100644 --- a/drivers/cpufreq/cppc_cpufreq.c +++ b/drivers/cpufreq/cppc_cpufreq.c @@ -1139,11 +1139,70 @@ static int cppc_get_perf_limited_filtered(int cpu, = u64 *perf_limited) CPPC_CPUFREQ_ATTR_RW_U64(perf_limited, cppc_get_perf_limited_filtered, cppc_set_perf_limited) =20 +static ssize_t show_ospm_nominal_freq(struct cpufreq_policy *policy, char = *buf) +{ + struct cppc_cpudata *cpu_data =3D policy->driver_data; + unsigned int freq_khz; + + if (!cpu_data->ospm_nominal_perf_set) + return sysfs_emit(buf, "0\n"); + + freq_khz =3D cppc_perf_to_khz(&cpu_data->perf_caps, + cpu_data->ospm_nominal_perf); + return sysfs_emit(buf, "%u\n", freq_khz); +} + +static ssize_t store_ospm_nominal_freq(struct cpufreq_policy *policy, + const char *buf, size_t count) +{ + struct cppc_cpudata *cpu_data =3D policy->driver_data; + bool prev_set =3D cpu_data->ospm_nominal_perf_set; + u32 prev_perf =3D cpu_data->ospm_nominal_perf; + unsigned int sib, freq_khz, failing_cpu =3D 0; + u32 perf; + int ret; + + ret =3D kstrtouint(buf, 0, &freq_khz); + if (ret) + return ret; + + perf =3D cppc_khz_to_perf(&cpu_data->perf_caps, freq_khz); + + for_each_cpu(sib, policy->cpus) { + ret =3D cppc_set_ospm_nominal_perf(sib, perf); + if (ret) { + failing_cpu =3D sib; + goto rollback; + } + } + + cpu_data->ospm_nominal_perf =3D perf; + cpu_data->ospm_nominal_perf_set =3D true; + return count; + +rollback: + /* + * Restore the previous value on siblings already updated. + * for_each_cpu() iterates in CPU-id order, so siblings before + * @failing_cpu were updated successfully. Skip restore when + * there is no prior known-good value (first-ever write failed). + */ + if (prev_set) { + for_each_cpu(sib, policy->cpus) { + if (sib =3D=3D failing_cpu) + break; + cppc_set_ospm_nominal_perf(sib, prev_perf); + } + } + return ret; +} + cpufreq_freq_attr_ro(freqdomain_cpus); cpufreq_freq_attr_rw(auto_select); cpufreq_freq_attr_rw(auto_act_window); cpufreq_freq_attr_rw(energy_performance_preference_val); cpufreq_freq_attr_rw(perf_limited); +cpufreq_freq_attr_rw(ospm_nominal_freq); =20 static struct freq_attr *cppc_cpufreq_attr[] =3D { &freqdomain_cpus, @@ -1151,6 +1210,7 @@ static struct freq_attr *cppc_cpufreq_attr[] =3D { &auto_act_window, &energy_performance_preference_val, &perf_limited, + &ospm_nominal_freq, NULL, }; =20 diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h index 9b18fb9aab7c..14c6d5d0ac12 100644 --- a/include/acpi/cppc_acpi.h +++ b/include/acpi/cppc_acpi.h @@ -154,6 +154,13 @@ struct cppc_cpudata { struct cppc_perf_fb_ctrs perf_fb_ctrs; unsigned int shared_type; cpumask_var_t shared_cpu_map; + /* + * Cached OSPM Nominal Performance value (write-only register). + * ospm_nominal_perf_set is true once userspace has written, so an + * unwritten cache is distinguishable from a valid 0 perf write. + */ + u32 ospm_nominal_perf; + bool ospm_nominal_perf_set; }; =20 #ifdef CONFIG_ACPI_CPPC_LIB @@ -181,6 +188,7 @@ extern int cpc_write_ffh(int cpunum, struct cpc_reg *re= g, u64 val); extern int cppc_get_epp_perf(int cpunum, u64 *epp_perf); extern int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, = bool enable); extern int cppc_set_epp(int cpu, u64 epp_val); +extern int cppc_set_ospm_nominal_perf(int cpu, u64 ospm_nominal_perf); extern int cppc_get_auto_act_window(int cpu, u64 *auto_act_window); extern int cppc_set_auto_act_window(int cpu, u64 auto_act_window); extern int cppc_get_auto_sel(int cpu, bool *enable); @@ -267,6 +275,10 @@ static inline int cppc_set_epp(int cpu, u64 epp_val) { return -EOPNOTSUPP; } +static inline int cppc_set_ospm_nominal_perf(int cpu, u64 ospm_nominal_per= f) +{ + return -EOPNOTSUPP; +} static inline int cppc_get_auto_act_window(int cpu, u64 *auto_act_window) { return -EOPNOTSUPP; --=20 2.34.1