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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 | ||
073828e9 RPM |
17 | #include <xen/xen.h> |
18 | ||
46ba51ea HG |
19 | #include "internal.h" |
20 | ||
46ba51ea HG |
21 | static bool __init processor_physically_present(acpi_handle handle) |
22 | { | |
23 | int cpuid, type; | |
24 | u32 acpi_id; | |
25 | acpi_status status; | |
26 | acpi_object_type acpi_type; | |
27 | unsigned long long tmp; | |
28 | union acpi_object object = { 0 }; | |
29 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; | |
30 | ||
31 | status = acpi_get_type(handle, &acpi_type); | |
32 | if (ACPI_FAILURE(status)) | |
33 | return false; | |
34 | ||
35 | switch (acpi_type) { | |
36 | case ACPI_TYPE_PROCESSOR: | |
37 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); | |
38 | if (ACPI_FAILURE(status)) | |
39 | return false; | |
40 | acpi_id = object.processor.proc_id; | |
41 | break; | |
42 | case ACPI_TYPE_DEVICE: | |
43 | status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp); | |
44 | if (ACPI_FAILURE(status)) | |
45 | return false; | |
46 | acpi_id = tmp; | |
47 | break; | |
48 | default: | |
49 | return false; | |
50 | } | |
51 | ||
073828e9 RPM |
52 | if (xen_initial_domain()) |
53 | /* | |
54 | * When running as a Xen dom0 the number of processors Linux | |
55 | * sees can be different from the real number of processors on | |
56 | * the system, and we still need to execute _PDC for all of | |
57 | * them. | |
58 | */ | |
59 | return xen_processor_present(acpi_id); | |
60 | ||
46ba51ea HG |
61 | type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; |
62 | cpuid = acpi_get_cpuid(handle, type, acpi_id); | |
63 | ||
25956b66 | 64 | return !invalid_logical_cpuid(cpuid); |
46ba51ea HG |
65 | } |
66 | ||
67 | static void acpi_set_pdc_bits(u32 *buf) | |
68 | { | |
69 | buf[0] = ACPI_PDC_REVISION_ID; | |
70 | buf[1] = 1; | |
71 | ||
72 | /* Enable coordination with firmware's _TSD info */ | |
73 | buf[2] = ACPI_PDC_SMP_T_SWCOORD; | |
74 | ||
75 | /* Twiddle arch-specific bits needed for _PDC */ | |
76 | arch_acpi_set_pdc_bits(buf); | |
77 | } | |
78 | ||
79 | static struct acpi_object_list *acpi_processor_alloc_pdc(void) | |
80 | { | |
81 | struct acpi_object_list *obj_list; | |
82 | union acpi_object *obj; | |
83 | u32 *buf; | |
84 | ||
85 | /* allocate and initialize pdc. It will be used later. */ | |
86 | obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); | |
87 | if (!obj_list) | |
88 | goto out; | |
89 | ||
90 | obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); | |
91 | if (!obj) { | |
92 | kfree(obj_list); | |
93 | goto out; | |
94 | } | |
95 | ||
96 | buf = kmalloc(12, GFP_KERNEL); | |
97 | if (!buf) { | |
98 | kfree(obj); | |
99 | kfree(obj_list); | |
100 | goto out; | |
101 | } | |
102 | ||
103 | acpi_set_pdc_bits(buf); | |
104 | ||
105 | obj->type = ACPI_TYPE_BUFFER; | |
106 | obj->buffer.length = 12; | |
107 | obj->buffer.pointer = (u8 *) buf; | |
108 | obj_list->count = 1; | |
109 | obj_list->pointer = obj; | |
110 | ||
111 | return obj_list; | |
112 | out: | |
113 | pr_err("Memory allocation error\n"); | |
114 | return NULL; | |
115 | } | |
116 | ||
117 | /* | |
118 | * _PDC is required for a BIOS-OS handshake for most of the newer | |
119 | * ACPI processor features. | |
120 | */ | |
121 | static acpi_status | |
122 | acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in) | |
123 | { | |
124 | acpi_status status = AE_OK; | |
125 | ||
126 | if (boot_option_idle_override == IDLE_NOMWAIT) { | |
127 | /* | |
128 | * If mwait is disabled for CPU C-states, the C2C3_FFH access | |
129 | * mode will be disabled in the parameter of _PDC object. | |
130 | * Of course C1_FFH access mode will also be disabled. | |
131 | */ | |
132 | union acpi_object *obj; | |
133 | u32 *buffer = NULL; | |
134 | ||
135 | obj = pdc_in->pointer; | |
136 | buffer = (u32 *)(obj->buffer.pointer); | |
137 | buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); | |
138 | ||
139 | } | |
140 | status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL); | |
141 | ||
142 | if (ACPI_FAILURE(status)) | |
52af99c3 RW |
143 | acpi_handle_debug(handle, |
144 | "Could not evaluate _PDC, using legacy perf control\n"); | |
46ba51ea HG |
145 | |
146 | return status; | |
147 | } | |
148 | ||
149 | void acpi_processor_set_pdc(acpi_handle handle) | |
150 | { | |
151 | struct acpi_object_list *obj_list; | |
152 | ||
153 | if (arch_has_acpi_pdc() == false) | |
154 | return; | |
155 | ||
156 | obj_list = acpi_processor_alloc_pdc(); | |
157 | if (!obj_list) | |
158 | return; | |
159 | ||
160 | acpi_processor_eval_pdc(handle, obj_list); | |
161 | ||
162 | kfree(obj_list->pointer->buffer.pointer); | |
163 | kfree(obj_list->pointer); | |
164 | kfree(obj_list); | |
165 | } | |
166 | ||
167 | static acpi_status __init | |
168 | early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) | |
169 | { | |
170 | if (processor_physically_present(handle) == false) | |
171 | return AE_OK; | |
172 | ||
173 | acpi_processor_set_pdc(handle); | |
174 | return AE_OK; | |
175 | } | |
176 | ||
177 | static int __init set_no_mwait(const struct dmi_system_id *id) | |
178 | { | |
179 | pr_notice("%s detected - disabling mwait for CPU C-states\n", | |
180 | id->ident); | |
181 | boot_option_idle_override = IDLE_NOMWAIT; | |
182 | return 0; | |
183 | } | |
184 | ||
6faadbbb | 185 | static const struct dmi_system_id processor_idle_dmi_table[] __initconst = { |
46ba51ea HG |
186 | { |
187 | set_no_mwait, "Extensa 5220", { | |
188 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
189 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), | |
190 | DMI_MATCH(DMI_PRODUCT_VERSION, "0100"), | |
191 | DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL}, | |
192 | {}, | |
193 | }; | |
194 | ||
195 | static void __init processor_dmi_check(void) | |
196 | { | |
197 | /* | |
198 | * Check whether the system is DMI table. If yes, OSPM | |
199 | * should not use mwait for CPU-states. | |
200 | */ | |
201 | dmi_check_system(processor_idle_dmi_table); | |
202 | } | |
203 | ||
204 | void __init acpi_early_processor_set_pdc(void) | |
205 | { | |
206 | processor_dmi_check(); | |
207 | ||
208 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, | |
209 | ACPI_UINT32_MAX, | |
210 | early_init_pdc, NULL, NULL, NULL); | |
211 | acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL); | |
212 | } |