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Wysocki" , Len Brown CC: Ray Huang , Xenia Ragiadakou , , , References: <20241205054252.471761-1-Penny.Zheng@amd.com> <20241205054252.471761-4-Penny.Zheng@amd.com> Content-Language: en-US From: Jason Andryuk In-Reply-To: <20241205054252.471761-4-Penny.Zheng@amd.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF0002256E:EE_|SJ0PR12MB8616:EE_ X-MS-Office365-Filtering-Correlation-Id: 23d477f3-baab-4374-3b28-08dd15716852 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|36860700013|82310400026|1800799024; X-Microsoft-Antispam-Message-Info: =?utf-8?B?N3BjdzUrRi9uK2tTYzRyTjF0UVVzMzFOZklEbnFzMktlNmFXd0hPZWZlcVBs?= =?utf-8?B?dmlzKzhPRDYwM0dVVUtlb2k2YVpUNHdWV2Y3NnZJZzF3MjJoaFJoUW13OVd2?= =?utf-8?B?bWtHVFYrOFFOWEhvcnN0QTJOZGFtdmRkMEhadnpENys1V2hMb3NKanVWZmo2?= =?utf-8?B?NE5UK3J6bmgxL3R2WUx0Q3pORGFFQnBVdm1DMnJhbVV4eDRhWkluZU53TExt?= =?utf-8?B?ZThXTnVFeVR0VFAwS2huZUlsTWM3ZlpndVg2OCtmVmRScjE2K1BPZlZKOEdB?= =?utf-8?B?NzN3ekp2bWRqcVphdnhWQ2hBR2wzYURzZDFlYkdZNU00L1JEMlgrZWR3dUg5?= =?utf-8?B?MmtWdW1zRWl1dk0zY0tDMGpqNDFobW4rb0NpYU5WakRkc3E4MURwZjQyWFR5?= =?utf-8?B?dVBId1Q3WVFUMHpLdVpGbEZudXA2UVZoRzhoTjJyblAxaVA3Q1BZcjhaeWhG?= =?utf-8?B?V1kyOXV5a1I4bW5CcTBVVDU5Y3J5bjJXN1d4bFRXTTIvdkk5NlNPTU1pbk91?= =?utf-8?B?RCtocmNNaTdZdzMvOWVzL3ZUQVExU2tVaTVzUjlpWjFTZXZkdlowbjVhQ0Iv?= =?utf-8?B?Z3BvbmpVQXlYV2g1OS9kN3BPQmN4SjdaVGpIUzNZY2l1bjRZRm1ZRW9BbmJC?= =?utf-8?B?dXZKUzk2MDBNb3VGWDNUVm9xMTJyRGFLalExS3dBQy9tbGY5RXkrL0ROZUVo?= =?utf-8?B?RlpxeXMzRlR2eGw0UDVhdmp0d2U2U2tXd0JuYkU0SE1hcUxaTkJGSVg0djVZ?= =?utf-8?B?THIzV3ZmaWVobUx1Z3NNUXptYnFvcFEySzlMRTZhRHByOEVDMWFSREVhUzR2?= =?utf-8?B?UU9lUHZqdXpta1FuSkxiLzNHd3AxaHcxU2VzT0xMM1FmbGVoaU5PdmZORE84?= =?utf-8?B?a1lvaVY5a21wV1lhSnAvTmhLeUFvcFFJWU11cHFoYkpwU0tSSk1vREtwY3Rp?= =?utf-8?B?dllTTHpRQ2R2ZWNtaEx1MVB2OURVZjcyTUl2LzVWZGVxbTB3Uk5RZ0swTkNI?= =?utf-8?B?bS9CVmkzK09DQUwzNlBBVkx3N2VaM00vTnR5RjFyRHJqemFmRVFKSmFWd0sz?= =?utf-8?B?T3E2WjBKcC81K1k4TDVaRnRRdXkxaktoMHJhTkI2RnZzazBORm9JcXZpdjBz?= =?utf-8?B?UzlZcmRsY24zSm9kMVFmb2VBc1pGZllZWmtJNkdqQVgzUmpENkdjVnZvWFIy?= =?utf-8?B?UDlyNm1pR2U4em80SVhkbHg2SVNnREVXWDdwNUVkRXBCaWM2YXRncGpuYzlE?= =?utf-8?B?Tk05R0w2OHlmL2swaURGVEtvcE5aTlY2bzFuc3lsN2Z1aDhDcEtHNXNWQnhz?= =?utf-8?B?WEhnQTZ5Y3VqNkdEYjRScU4vYVBwcVBuWDhMajRxenBpWERZaTN6eXRoVzJX?= =?utf-8?B?SFAveDJLZmd6dURLcCtBL3ZKdnZ6Nnh1VEhqc25zRUY4WTI5NEtwcGdVN0JV?= =?utf-8?B?RE9QM0hxUUVNaGV4UGpOZFN4ME5PUkE5MDhFcG81ZkdnN0FRb09zb2l2VUts?= =?utf-8?B?UnlrR2NVVkI5bWZTc3B5dyt2NTdsMUNDeXVXTjZoNlQ2WTlxQjR3NlBHcm40?= =?utf-8?B?SCtHK3FzcHlxQjlkU3RCOHR4bXJvSDVCMkNnVnFMWlFKN0NSWG5XMHl2VHdk?= =?utf-8?B?OXo2MmpOc0xyRHRybnltdnRxNzRYck1lMjA3TGFYSm1oV3ZzckpvS2ZLaGhZ?= =?utf-8?B?TzRwTlRhS093QTZZVXpYbEo0bk9Ib0U1Y2o2TTREMmVFeENKUE1xNnBPMGM2?= =?utf-8?B?Yyt6d3UxbkFiU0dtRDlMZ3N2NWtETXVNS2tGY3RTdkhUUndDQzVET1ZFajU3?= =?utf-8?B?RVJRNTR4M3BJV0Z3ajZPaVkrdHZYM0NjejFEOVZxWUFFRUhsajBEUURwcWhw?= =?utf-8?B?MUJXYXZWOStVejdFaU92djNmUTRjZ0V1R05WZThSL0VqRjJxZUN3LzQydDIx?= =?utf-8?Q?wp7VhpvOKtHjKDT20YP0mqSh8GW5X9Nk?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(36860700013)(82310400026)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Dec 2024 21:11:38.1560 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 23d477f3-baab-4374-3b28-08dd15716852 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=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0002256E.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB8616 Add Rafael and Len, On 2024-12-05 00:42, Penny Zheng wrote: > When running as Xen dom0 PVH guest, processor logical id <-> physical > id map could not be properly set up. So the original function > cppc_get_perf_caps() fails to get correct cppc data for Xen ACPI > processor. > > A new function xen_processor_get_perf_caps() is introduced to > get xen-required cppc perf caps data. > > Also, as Xen couldn't read and process PCC-type register, this commit > includes a new flag pcc_unsupported in struct acpi_processor_flags to > tell whether platform supports PCC-type register. > > Signed-off-by: Penny Zheng Reviewed-by: Jason Andryuk Again, no further comments - keeping full patch for others. Regards, Jason > --- > drivers/acpi/cppc_acpi.c | 110 +++++++++++++++++++++++++++++++++++---- > include/acpi/cppc_acpi.h | 5 ++ > include/acpi/processor.h | 1 + > 3 files changed, 105 insertions(+), 11 deletions(-) > > diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c > index 13d6ff84a1e9..3a436591da07 100644 > --- a/drivers/acpi/cppc_acpi.c > +++ b/drivers/acpi/cppc_acpi.c > @@ -772,6 +772,15 @@ static int acpi_cppc_processor_parse(struct acpi_processor *pr, struct cpc_desc > * so extract it only once. > */ > if (gas_t->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) { > + /* > + * When ACPI processor represents Xen processor, PCC register type > + * could not be properly read and processed right now, as logical > + * processor doesn't always have 1:1 map relation to physical processor. > + */ > + if (pr->flags.pcc_unsupported) { > + pr_debug("Unsupported PCC register type:%d\n", pr->acpi_id); > + goto out_free; > + } > if (pcc_subspace_id < 0) { > pcc_subspace_id = gas_t->access_width; > if (pcc_data_alloc(pcc_subspace_id)) > @@ -837,7 +846,9 @@ static int acpi_cppc_processor_parse(struct acpi_processor *pr, struct cpc_desc > goto out_free; > } > } > - per_cpu(cpu_pcc_subspace_idx, pr->id) = pcc_subspace_id; > + > + if (!pr->flags.pcc_unsupported) > + per_cpu(cpu_pcc_subspace_idx, pr->id) = pcc_subspace_id; > > /* > * Initialize the remaining cpc_regs as unsupported. > @@ -1018,8 +1029,7 @@ int __weak cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val) > static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val) > { > void __iomem *vaddr = NULL; > - int size; > - int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu); > + int size, pcc_ss_id; > struct cpc_reg *reg = ®_res->cpc_entry.reg; > > if (reg_res->type == ACPI_TYPE_INTEGER) { > @@ -1044,14 +1054,17 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val) > > *val = val_u32; > return 0; > - } else if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM && pcc_ss_id >= 0) { > - /* > - * For registers in PCC space, the register size is determined > - * by the bit width field; the access size is used to indicate > - * the PCC subspace id. > - */ > - size = reg->bit_width; > - vaddr = GET_PCC_VADDR(reg->address, pcc_ss_id); > + } else if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) { > + pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu); > + if (pcc_ss_id >= 0) { > + /* > + * For registers in PCC space, the register size is determined > + * by the bit width field; the access size is used to indicate > + * the PCC subspace id. > + */ > + size = reg->bit_width; > + vaddr = GET_PCC_VADDR(reg->address, pcc_ss_id); > + } > } > else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) > vaddr = reg_res->sys_mem_vaddr; > @@ -1282,6 +1295,81 @@ int cppc_get_epp_perf(int cpunum, u64 *epp_perf) > } > EXPORT_SYMBOL_GPL(cppc_get_epp_perf); > > + > +int xen_processor_get_perf_caps(struct acpi_processor *pr, struct cppc_perf_caps *perf_caps) > +{ > + struct cpc_desc *cpc_ptr; > + struct cpc_register_resource *highest_reg, *lowest_reg, > + *lowest_non_linear_reg, *nominal_reg, > + *low_freq_reg = NULL, *nom_freq_reg = NULL; > + u64 high, low, nom, min_nonlinear, low_f = 0, nom_f = 0; > + int ret = 0; > + > + cpc_ptr = kzalloc(sizeof(struct cpc_desc), GFP_KERNEL); > + if (!cpc_ptr) > + return -ENOMEM; > + > + ret = acpi_cppc_processor_parse(pr, cpc_ptr); > + if (ret) > + goto err; > + > + highest_reg = &cpc_ptr->cpc_regs[HIGHEST_PERF]; > + lowest_reg = &cpc_ptr->cpc_regs[LOWEST_PERF]; > + lowest_non_linear_reg = &cpc_ptr->cpc_regs[LOW_NON_LINEAR_PERF]; > + nominal_reg = &cpc_ptr->cpc_regs[NOMINAL_PERF]; > + low_freq_reg = &cpc_ptr->cpc_regs[LOWEST_FREQ]; > + nom_freq_reg = &cpc_ptr->cpc_regs[NOMINAL_FREQ]; > + > + /* Are any of the regs PCC ?*/ > + if (CPC_IN_PCC(highest_reg) || CPC_IN_PCC(lowest_reg) || > + CPC_IN_PCC(lowest_non_linear_reg) || CPC_IN_PCC(nominal_reg) || > + CPC_IN_PCC(low_freq_reg) || CPC_IN_PCC(nom_freq_reg)) { > + pr_debug("Unsupported register type read for Xen Processor %d," > + "highest_reg in PCC: %s, lowest_reg in PCC: %s," > + "lowest_non_linear_reg in PCC: %s, nominal_reg in PCC: %s," > + "low_freq_reg in PCC: %s, nom_freq_reg in PCC: %s\n", > + pr->acpi_id, CPC_IN_PCC(highest_reg) ? "true" : "false", > + CPC_IN_PCC(lowest_reg) ? "true" : "false", > + CPC_IN_PCC(lowest_non_linear_reg) ? "true" : "false", > + CPC_IN_PCC(nominal_reg) ? "true" : "false", > + CPC_IN_PCC(low_freq_reg) ? "true" : "false", > + CPC_IN_PCC(nom_freq_reg) ? "true" : "false"); > + goto err; > + } > + > + cpc_read(pr->acpi_id, highest_reg, &high); > + perf_caps->highest_perf = high; > + > + cpc_read(pr->acpi_id, lowest_reg, &low); > + perf_caps->lowest_perf = low; > + > + cpc_read(pr->acpi_id, nominal_reg, &nom); > + perf_caps->nominal_perf = nom; > + > + cpc_read(pr->id, lowest_non_linear_reg, &min_nonlinear); > + perf_caps->lowest_nonlinear_perf = min_nonlinear; > + > + if (!high || !low || !nom || !min_nonlinear) > + pr_warn("CPPC: read zero cpc register value for Xen Processor %d" > + "highest_reg: %llu, lowest_reg: %llu" > + "nominal_reg: %llu, lowest_non_linear_reg: %llu\n", > + pr->acpi_id, high, low, nom, min_nonlinear); > + > + /* Read optional lowest and nominal frequencies if present */ > + if (CPC_SUPPORTED(low_freq_reg)) > + cpc_read(pr->acpi_id, low_freq_reg, &low_f); > + > + if (CPC_SUPPORTED(nom_freq_reg)) > + cpc_read(pr->acpi_id, nom_freq_reg, &nom_f); > + > + perf_caps->lowest_freq = low_f; > + perf_caps->nominal_freq = nom_f; > + > + err: > + kfree(cpc_ptr); > + return ret; > +} > +EXPORT_SYMBOL_GPL(xen_processor_get_perf_caps); > /** > * cppc_get_perf_caps - Get a CPU's performance capabilities. > * @cpunum: CPU from which to get capabilities info. > diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h > index 76e44e102780..2281110c00b7 100644 > --- a/include/acpi/cppc_acpi.h > +++ b/include/acpi/cppc_acpi.h > @@ -164,6 +164,7 @@ extern int cppc_set_auto_sel(int cpu, bool enable); > extern int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf); > extern int amd_get_boost_ratio_numerator(unsigned int cpu, u64 *numerator); > extern int amd_detect_prefcore(bool *detected); > +extern int xen_processor_get_perf_caps(struct acpi_processor *pr, struct cppc_perf_caps *perf_caps); > #else /* !CONFIG_ACPI_CPPC_LIB */ > static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf) > { > @@ -249,6 +250,10 @@ static inline int amd_detect_prefcore(bool *detected) > { > return -ENODEV; > } > +static inline int xen_processor_get_perf_caps(struct acpi_processor *pr, struct cppc_perf_caps *perf_caps) > +{ > + return -ENOTSUPP; > +} > #endif /* !CONFIG_ACPI_CPPC_LIB */ > > #endif /* _CPPC_ACPI_H*/ > diff --git a/include/acpi/processor.h b/include/acpi/processor.h > index e6f6074eadbf..18499cc11366 100644 > --- a/include/acpi/processor.h > +++ b/include/acpi/processor.h > @@ -214,6 +214,7 @@ struct acpi_processor_flags { > u8 bm_control:1; > u8 bm_check:1; > u8 has_cst:1; > + u8 pcc_unsupported:1; > u8 has_lpi:1; > u8 power_setup_done:1; > u8 bm_rld_set:1;