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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Dec 2024 08:25:35.4462 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 29f313d5-150c-4f40-ecbd-08dd143d3a01 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: MN1PEPF0000ECDB.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB6792 As Xen is uncapable of parsing the ACPI dynamic table, this commit introduces a new sub-hypercall XEN_PM_CPPC to deliver CPPC perf caps data. Signed-off-by: Penny Zheng --- drivers/acpi/cppc_acpi.c | 1 + drivers/xen/xen-acpi-processor.c | 89 +++++++++++++++++++++++++++++++- include/acpi/processor.h | 1 + include/xen/interface/platform.h | 11 ++++ 4 files changed, 101 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index d4780739d4a1..a30eeb0d9cb7 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -860,6 +860,7 @@ static int acpi_cppc_processor_parse(struct acpi_processor *pr, struct cpc_desc cpc_ptr->cpc_regs[i].cpc_entry.int_value = 0; } + pr->flags.has_cpc = 1; pr_debug("Parsed _CPC entry for CPU: %d\n", pr->acpi_id); kfree(output.pointer); return 0; diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-processor.c index 74dcc84b9199..9de59774eac5 100644 --- a/drivers/xen/xen-acpi-processor.c +++ b/drivers/xen/xen-acpi-processor.c @@ -25,6 +25,7 @@ #include #include #include +#include static int no_hypercall; MODULE_PARM_DESC(off, "Inhibit the hypercall."); @@ -45,8 +46,12 @@ static unsigned long *acpi_ids_done; static unsigned long *acpi_id_present; /* And if there is an _CST definition (or a PBLK) for the ACPI IDs */ static unsigned long *acpi_id_cst_present; +/* And if there is an _CPC entry for the ACPI IDs */ +static unsigned long *acpi_id_cpc_present; /* Which ACPI P-State dependencies for a enumerated processor */ static struct acpi_psd_package *acpi_psd; +/* ACPI CPPC structures for a enumerated processor */ +static struct cppc_perf_caps *acpi_cppc_data; static bool pr_initialized; @@ -208,6 +213,44 @@ static int xen_copy_pct_data(struct acpi_pct_register *pct, dst_pct->address = pct->address; return 0; } +static int push_cppc_to_hypervisor(struct acpi_processor *_pr) +{ + int ret = 0; + struct xen_platform_op op = { + .cmd = XENPF_set_processor_pminfo, + .interface_version = XENPF_INTERFACE_VERSION, + .u.set_pminfo.id = _pr->acpi_id, + .u.set_pminfo.type = XEN_PM_CPPC, + }; + struct cppc_perf_caps *cppc_perf = acpi_cppc_data + _pr->acpi_id; + + op.u.set_pminfo.cppc_data.highest_perf = cppc_perf->highest_perf; + op.u.set_pminfo.cppc_data.lowest_perf = cppc_perf->lowest_perf; + op.u.set_pminfo.cppc_data.nominal_perf = cppc_perf->nominal_perf; + op.u.set_pminfo.cppc_data.lowest_nonlinear_perf = cppc_perf->lowest_nonlinear_perf; + op.u.set_pminfo.cppc_data.lowest_freq = cppc_perf->lowest_freq; + op.u.set_pminfo.cppc_data.nominal_freq = cppc_perf->nominal_freq; + + if (!no_hypercall) + ret = HYPERVISOR_platform_op(&op); + + if (!ret) { + pr_debug("ACPI CPU%u - CPPC uploaded.\n", _pr->acpi_id); + pr_debug(" highest_perf: %d\n", cppc_perf->highest_perf); + pr_debug(" lowest_perf: %d\n", cppc_perf->lowest_perf); + pr_debug(" lowest_nonlinear_perf: %d\n", cppc_perf->lowest_nonlinear_perf); + pr_debug(" nominal_perf: %d\n", cppc_perf->nominal_perf); + pr_debug(" lowest_freq: %d Mhz\n", cppc_perf->lowest_freq); + pr_debug(" nominal_freq: %d Mhz\n", cppc_perf->nominal_freq); + } else if ((ret != -EINVAL) && (ret != -ENOSYS)) + /* EINVAL means the ACPI ID is incorrect - meaning the ACPI + * table is referencing a non-existing CPU - which can happen + * with broken ACPI tables. */ + pr_warn("(_CPC): Hypervisor error (%d) for ACPI CPU%u\n", + ret, _pr->acpi_id); + + return ret; +} static int push_pxx_to_hypervisor(struct acpi_processor *_pr) { int ret = 0; @@ -284,6 +327,9 @@ static int upload_pm_data(struct acpi_processor *_pr) if (_pr->flags.power) err = push_cxx_to_hypervisor(_pr); + if (_pr->flags.has_cpc) + err |= push_cppc_to_hypervisor(_pr); + if (_pr->performance && _pr->performance->states) err |= push_pxx_to_hypervisor(_pr); @@ -488,6 +534,7 @@ read_acpi_id(acpi_handle handle, u32 lvl, void *context, void **rv) union acpi_object object = { 0 }; struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; struct acpi_buffer cst_buf = { ACPI_ALLOCATE_BUFFER, NULL }; + struct acpi_buffer cpc_buf = { ACPI_ALLOCATE_BUFFER, NULL }; acpi_io_address pblk = 0; status = acpi_get_type(handle, &acpi_type); @@ -567,6 +614,15 @@ read_acpi_id(acpi_handle handle, u32 lvl, void *context, void **rv) /* .. and it has a C-state */ __set_bit(acpi_id, acpi_id_cst_present); + status = acpi_evaluate_object(handle, "_CPC", NULL, &cpc_buf); + if (ACPI_FAILURE(status)) { + return AE_OK; + } + kfree(cpc_buf.pointer); + + /* .. and it has a _CPC entry */ + __set_bit(acpi_id, acpi_id_cpc_present); + return AE_OK; } static int check_acpi_ids(struct acpi_processor *pr_backup) @@ -574,7 +630,7 @@ static int check_acpi_ids(struct acpi_processor *pr_backup) BUG_ON(!pr_backup); - if (acpi_id_present && acpi_id_cst_present) + if (acpi_id_present && acpi_id_cst_present && acpi_id_cpc_present) /* OK, done this once .. skip to uploading */ goto upload; @@ -591,11 +647,19 @@ static int check_acpi_ids(struct acpi_processor *pr_backup) return -ENOMEM; } + acpi_id_cpc_present = bitmap_zalloc(nr_acpi_bits, GFP_KERNEL); + if (!acpi_id_cpc_present) { + bitmap_free(acpi_id_present); + bitmap_free(acpi_id_cst_present); + return -ENOMEM; + } + acpi_psd = kcalloc(nr_acpi_bits, sizeof(struct acpi_psd_package), GFP_KERNEL); if (!acpi_psd) { bitmap_free(acpi_id_present); bitmap_free(acpi_id_cst_present); + bitmap_free(acpi_id_cpc_present); return -ENOMEM; } @@ -611,6 +675,12 @@ static int check_acpi_ids(struct acpi_processor *pr_backup) pr_backup->acpi_id = i; /* Mask out C-states if there are no _CST or PBLK */ pr_backup->flags.power = test_bit(i, acpi_id_cst_present); + /* Mask out relevant flag if there are no _CPC */ + pr_backup->flags.has_cpc = test_bit(i, acpi_id_cpc_present); + if (pr_backup->flags.has_cpc) { + if (xen_processor_get_perf_caps(pr_backup, acpi_cppc_data + i)) + return -EINVAL; + } /* num_entries is non-zero if we evaluated _PSD */ if (acpi_psd[i].num_entries) { memcpy(&pr_backup->performance->domain_info, @@ -729,6 +799,15 @@ static int __init xen_acpi_processor_init(void) bitmap_free(acpi_ids_done); return -ENOMEM; } + + acpi_cppc_data = kcalloc(nr_acpi_bits, sizeof(struct cppc_perf_caps), + GFP_KERNEL); + if (!acpi_cppc_data) { + pr_debug("Memory allocation error for acpi_cppc_data\n"); + rc = -ENOMEM; + goto err1_out; + } + for_each_possible_cpu(i) { if (!zalloc_cpumask_var_node( &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map, @@ -754,6 +833,11 @@ static int __init xen_acpi_processor_init(void) rc = acpi_processor_get_performance_info(pr); if (rc) goto err_out; + + pr->flags.pcc_unsupported = true; + rc = xen_processor_get_perf_caps(pr, acpi_cppc_data + i); + if (rc) + goto err_out; } rc = xen_upload_processor_pm_data(); @@ -769,6 +853,8 @@ static int __init xen_acpi_processor_init(void) err_out: /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */ + kfree(acpi_cppc_data); +err1_out: free_acpi_perf_data(); bitmap_free(acpi_ids_done); return rc; @@ -782,6 +868,7 @@ static void __exit xen_acpi_processor_exit(void) bitmap_free(acpi_id_present); bitmap_free(acpi_id_cst_present); kfree(acpi_psd); + kfree(acpi_cppc_data); for_each_possible_cpu(i) acpi_processor_unregister_performance(i); diff --git a/include/acpi/processor.h b/include/acpi/processor.h index 18499cc11366..66492f5d68a8 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 has_cpc:1; u8 pcc_unsupported:1; u8 has_lpi:1; u8 power_setup_done:1; diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h index 79a443c65ea9..e11bb9443dc0 100644 --- a/include/xen/interface/platform.h +++ b/include/xen/interface/platform.h @@ -319,6 +319,7 @@ DEFINE_GUEST_HANDLE_STRUCT(xenpf_getidletime_t); #define XEN_PM_PX 1 #define XEN_PM_TX 2 #define XEN_PM_PDC 3 +#define XEN_PM_CPPC 4 /* Px sub info type */ #define XEN_PX_PCT 1 #define XEN_PX_PSS 2 @@ -384,6 +385,15 @@ struct xen_processor_px { }; DEFINE_GUEST_HANDLE_STRUCT(xen_processor_px); +struct xen_processor_cppc { + uint32_t highest_perf; + uint32_t nominal_perf; + uint32_t lowest_perf; + uint32_t lowest_nonlinear_perf; + uint32_t lowest_freq; + uint32_t nominal_freq; +}; + struct xen_psd_package { uint64_t num_entries; uint64_t revision; @@ -412,6 +422,7 @@ struct xenpf_set_processor_pminfo { struct xen_processor_power power;/* Cx: _CST/_CSD */ struct xen_processor_performance perf; /* Px: _PPC/_PCT/_PSS/_PSD */ GUEST_HANDLE(uint32_t) pdc; + struct xen_processor_cppc cppc_data; /* _CPC */ }; }; DEFINE_GUEST_HANDLE_STRUCT(xenpf_set_processor_pminfo); -- 2.34.1