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46ba51ea HG |
1 | /* |
2 | * Copyright (C) 2005 Intel Corporation | |
3 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. | |
4 | * | |
5 | * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> | |
6 | * - Added _PDC for platforms with Intel CPUs | |
7 | */ | |
8 | ||
9 | #define pr_fmt(fmt) "ACPI: " fmt | |
10 | ||
11 | #include <linux/dmi.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/acpi.h> | |
14 | #include <acpi/processor.h> | |
15 | ||
16 | #include "internal.h" | |
17 | ||
18 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
19 | ACPI_MODULE_NAME("processor_pdc"); | |
20 | ||
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 | ||
52 | type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; | |
53 | cpuid = acpi_get_cpuid(handle, type, acpi_id); | |
54 | ||
55 | if (cpuid == -1) | |
56 | return false; | |
57 | ||
58 | return true; | |
59 | } | |
60 | ||
61 | static void acpi_set_pdc_bits(u32 *buf) | |
62 | { | |
63 | buf[0] = ACPI_PDC_REVISION_ID; | |
64 | buf[1] = 1; | |
65 | ||
66 | /* Enable coordination with firmware's _TSD info */ | |
67 | buf[2] = ACPI_PDC_SMP_T_SWCOORD; | |
68 | ||
69 | /* Twiddle arch-specific bits needed for _PDC */ | |
70 | arch_acpi_set_pdc_bits(buf); | |
71 | } | |
72 | ||
73 | static struct acpi_object_list *acpi_processor_alloc_pdc(void) | |
74 | { | |
75 | struct acpi_object_list *obj_list; | |
76 | union acpi_object *obj; | |
77 | u32 *buf; | |
78 | ||
79 | /* allocate and initialize pdc. It will be used later. */ | |
80 | obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); | |
81 | if (!obj_list) | |
82 | goto out; | |
83 | ||
84 | obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); | |
85 | if (!obj) { | |
86 | kfree(obj_list); | |
87 | goto out; | |
88 | } | |
89 | ||
90 | buf = kmalloc(12, GFP_KERNEL); | |
91 | if (!buf) { | |
92 | kfree(obj); | |
93 | kfree(obj_list); | |
94 | goto out; | |
95 | } | |
96 | ||
97 | acpi_set_pdc_bits(buf); | |
98 | ||
99 | obj->type = ACPI_TYPE_BUFFER; | |
100 | obj->buffer.length = 12; | |
101 | obj->buffer.pointer = (u8 *) buf; | |
102 | obj_list->count = 1; | |
103 | obj_list->pointer = obj; | |
104 | ||
105 | return obj_list; | |
106 | out: | |
107 | pr_err("Memory allocation error\n"); | |
108 | return NULL; | |
109 | } | |
110 | ||
111 | /* | |
112 | * _PDC is required for a BIOS-OS handshake for most of the newer | |
113 | * ACPI processor features. | |
114 | */ | |
115 | static acpi_status | |
116 | acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in) | |
117 | { | |
118 | acpi_status status = AE_OK; | |
119 | ||
120 | if (boot_option_idle_override == IDLE_NOMWAIT) { | |
121 | /* | |
122 | * If mwait is disabled for CPU C-states, the C2C3_FFH access | |
123 | * mode will be disabled in the parameter of _PDC object. | |
124 | * Of course C1_FFH access mode will also be disabled. | |
125 | */ | |
126 | union acpi_object *obj; | |
127 | u32 *buffer = NULL; | |
128 | ||
129 | obj = pdc_in->pointer; | |
130 | buffer = (u32 *)(obj->buffer.pointer); | |
131 | buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); | |
132 | ||
133 | } | |
134 | status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL); | |
135 | ||
136 | if (ACPI_FAILURE(status)) | |
137 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
138 | "Could not evaluate _PDC, using legacy perf. control.\n")); | |
139 | ||
140 | return status; | |
141 | } | |
142 | ||
143 | void acpi_processor_set_pdc(acpi_handle handle) | |
144 | { | |
145 | struct acpi_object_list *obj_list; | |
146 | ||
147 | if (arch_has_acpi_pdc() == false) | |
148 | return; | |
149 | ||
150 | obj_list = acpi_processor_alloc_pdc(); | |
151 | if (!obj_list) | |
152 | return; | |
153 | ||
154 | acpi_processor_eval_pdc(handle, obj_list); | |
155 | ||
156 | kfree(obj_list->pointer->buffer.pointer); | |
157 | kfree(obj_list->pointer); | |
158 | kfree(obj_list); | |
159 | } | |
160 | ||
161 | static acpi_status __init | |
162 | early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) | |
163 | { | |
164 | if (processor_physically_present(handle) == false) | |
165 | return AE_OK; | |
166 | ||
167 | acpi_processor_set_pdc(handle); | |
168 | return AE_OK; | |
169 | } | |
170 | ||
171 | static int __init set_no_mwait(const struct dmi_system_id *id) | |
172 | { | |
173 | pr_notice("%s detected - disabling mwait for CPU C-states\n", | |
174 | id->ident); | |
175 | boot_option_idle_override = IDLE_NOMWAIT; | |
176 | return 0; | |
177 | } | |
178 | ||
179 | static struct dmi_system_id processor_idle_dmi_table[] __initdata = { | |
180 | { | |
181 | set_no_mwait, "Extensa 5220", { | |
182 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
183 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), | |
184 | DMI_MATCH(DMI_PRODUCT_VERSION, "0100"), | |
185 | DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL}, | |
186 | {}, | |
187 | }; | |
188 | ||
189 | static void __init processor_dmi_check(void) | |
190 | { | |
191 | /* | |
192 | * Check whether the system is DMI table. If yes, OSPM | |
193 | * should not use mwait for CPU-states. | |
194 | */ | |
195 | dmi_check_system(processor_idle_dmi_table); | |
196 | } | |
197 | ||
198 | void __init acpi_early_processor_set_pdc(void) | |
199 | { | |
200 | processor_dmi_check(); | |
201 | ||
202 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, | |
203 | ACPI_UINT32_MAX, | |
204 | early_init_pdc, NULL, NULL, NULL); | |
205 | acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL); | |
206 | } |