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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
46ba51ea HG |
2 | /* |
3 | * Copyright (C) 2005 Intel Corporation | |
4 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. | |
5 | * | |
6 | * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> | |
7 | * - Added _PDC for platforms with Intel CPUs | |
8 | */ | |
9 | ||
10 | #define pr_fmt(fmt) "ACPI: " fmt | |
11 | ||
12 | #include <linux/dmi.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/acpi.h> | |
15 | #include <acpi/processor.h> | |
16 | ||
17 | #include "internal.h" | |
18 | ||
19 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
20 | ACPI_MODULE_NAME("processor_pdc"); | |
21 | ||
22 | static bool __init processor_physically_present(acpi_handle handle) | |
23 | { | |
24 | int cpuid, type; | |
25 | u32 acpi_id; | |
26 | acpi_status status; | |
27 | acpi_object_type acpi_type; | |
28 | unsigned long long tmp; | |
29 | union acpi_object object = { 0 }; | |
30 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; | |
31 | ||
32 | status = acpi_get_type(handle, &acpi_type); | |
33 | if (ACPI_FAILURE(status)) | |
34 | return false; | |
35 | ||
36 | switch (acpi_type) { | |
37 | case ACPI_TYPE_PROCESSOR: | |
38 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); | |
39 | if (ACPI_FAILURE(status)) | |
40 | return false; | |
41 | acpi_id = object.processor.proc_id; | |
42 | break; | |
43 | case ACPI_TYPE_DEVICE: | |
44 | status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp); | |
45 | if (ACPI_FAILURE(status)) | |
46 | return false; | |
47 | acpi_id = tmp; | |
48 | break; | |
49 | default: | |
50 | return false; | |
51 | } | |
52 | ||
53 | type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; | |
54 | cpuid = acpi_get_cpuid(handle, type, acpi_id); | |
55 | ||
25956b66 | 56 | return !invalid_logical_cpuid(cpuid); |
46ba51ea HG |
57 | } |
58 | ||
59 | static void acpi_set_pdc_bits(u32 *buf) | |
60 | { | |
61 | buf[0] = ACPI_PDC_REVISION_ID; | |
62 | buf[1] = 1; | |
63 | ||
64 | /* Enable coordination with firmware's _TSD info */ | |
65 | buf[2] = ACPI_PDC_SMP_T_SWCOORD; | |
66 | ||
67 | /* Twiddle arch-specific bits needed for _PDC */ | |
68 | arch_acpi_set_pdc_bits(buf); | |
69 | } | |
70 | ||
71 | static struct acpi_object_list *acpi_processor_alloc_pdc(void) | |
72 | { | |
73 | struct acpi_object_list *obj_list; | |
74 | union acpi_object *obj; | |
75 | u32 *buf; | |
76 | ||
77 | /* allocate and initialize pdc. It will be used later. */ | |
78 | obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); | |
79 | if (!obj_list) | |
80 | goto out; | |
81 | ||
82 | obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); | |
83 | if (!obj) { | |
84 | kfree(obj_list); | |
85 | goto out; | |
86 | } | |
87 | ||
88 | buf = kmalloc(12, GFP_KERNEL); | |
89 | if (!buf) { | |
90 | kfree(obj); | |
91 | kfree(obj_list); | |
92 | goto out; | |
93 | } | |
94 | ||
95 | acpi_set_pdc_bits(buf); | |
96 | ||
97 | obj->type = ACPI_TYPE_BUFFER; | |
98 | obj->buffer.length = 12; | |
99 | obj->buffer.pointer = (u8 *) buf; | |
100 | obj_list->count = 1; | |
101 | obj_list->pointer = obj; | |
102 | ||
103 | return obj_list; | |
104 | out: | |
105 | pr_err("Memory allocation error\n"); | |
106 | return NULL; | |
107 | } | |
108 | ||
109 | /* | |
110 | * _PDC is required for a BIOS-OS handshake for most of the newer | |
111 | * ACPI processor features. | |
112 | */ | |
113 | static acpi_status | |
114 | acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in) | |
115 | { | |
116 | acpi_status status = AE_OK; | |
117 | ||
118 | if (boot_option_idle_override == IDLE_NOMWAIT) { | |
119 | /* | |
120 | * If mwait is disabled for CPU C-states, the C2C3_FFH access | |
121 | * mode will be disabled in the parameter of _PDC object. | |
122 | * Of course C1_FFH access mode will also be disabled. | |
123 | */ | |
124 | union acpi_object *obj; | |
125 | u32 *buffer = NULL; | |
126 | ||
127 | obj = pdc_in->pointer; | |
128 | buffer = (u32 *)(obj->buffer.pointer); | |
129 | buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); | |
130 | ||
131 | } | |
132 | status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL); | |
133 | ||
134 | if (ACPI_FAILURE(status)) | |
135 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
136 | "Could not evaluate _PDC, using legacy perf. control.\n")); | |
137 | ||
138 | return status; | |
139 | } | |
140 | ||
141 | void acpi_processor_set_pdc(acpi_handle handle) | |
142 | { | |
143 | struct acpi_object_list *obj_list; | |
144 | ||
145 | if (arch_has_acpi_pdc() == false) | |
146 | return; | |
147 | ||
148 | obj_list = acpi_processor_alloc_pdc(); | |
149 | if (!obj_list) | |
150 | return; | |
151 | ||
152 | acpi_processor_eval_pdc(handle, obj_list); | |
153 | ||
154 | kfree(obj_list->pointer->buffer.pointer); | |
155 | kfree(obj_list->pointer); | |
156 | kfree(obj_list); | |
157 | } | |
158 | ||
159 | static acpi_status __init | |
160 | early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) | |
161 | { | |
162 | if (processor_physically_present(handle) == false) | |
163 | return AE_OK; | |
164 | ||
165 | acpi_processor_set_pdc(handle); | |
166 | return AE_OK; | |
167 | } | |
168 | ||
169 | static int __init set_no_mwait(const struct dmi_system_id *id) | |
170 | { | |
171 | pr_notice("%s detected - disabling mwait for CPU C-states\n", | |
172 | id->ident); | |
173 | boot_option_idle_override = IDLE_NOMWAIT; | |
174 | return 0; | |
175 | } | |
176 | ||
6faadbbb | 177 | static const struct dmi_system_id processor_idle_dmi_table[] __initconst = { |
46ba51ea HG |
178 | { |
179 | set_no_mwait, "Extensa 5220", { | |
180 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
181 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), | |
182 | DMI_MATCH(DMI_PRODUCT_VERSION, "0100"), | |
183 | DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL}, | |
184 | {}, | |
185 | }; | |
186 | ||
187 | static void __init processor_dmi_check(void) | |
188 | { | |
189 | /* | |
190 | * Check whether the system is DMI table. If yes, OSPM | |
191 | * should not use mwait for CPU-states. | |
192 | */ | |
193 | dmi_check_system(processor_idle_dmi_table); | |
194 | } | |
195 | ||
196 | void __init acpi_early_processor_set_pdc(void) | |
197 | { | |
198 | processor_dmi_check(); | |
199 | ||
200 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, | |
201 | ACPI_UINT32_MAX, | |
202 | early_init_pdc, NULL, NULL, NULL); | |
203 | acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL); | |
204 | } |