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Commit | Line | Data |
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47817254 AC |
1 | /* |
2 | * Copyright (C) 2005 Intel Corporation | |
3 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. | |
4 | * | |
5 | * Alex Chiang <achiang@hp.com> | |
6 | * - Unified x86/ia64 implementations | |
7 | * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> | |
8 | * - Added _PDC for platforms with Intel CPUs | |
9 | */ | |
78f16996 AC |
10 | #include <linux/dmi.h> |
11 | ||
12 | #include <acpi/acpi_drivers.h> | |
13 | #include <acpi/processor.h> | |
14 | ||
15 | #include "internal.h" | |
16 | ||
17 | #define PREFIX "ACPI: " | |
18 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
19 | ACPI_MODULE_NAME("processor_pdc"); | |
20 | ||
21 | static int set_no_mwait(const struct dmi_system_id *id) | |
22 | { | |
23 | printk(KERN_NOTICE PREFIX "%s detected - " | |
24 | "disabling mwait for CPU C-states\n", id->ident); | |
25 | idle_nomwait = 1; | |
26 | return 0; | |
27 | } | |
28 | ||
29 | static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = { | |
30 | { | |
31 | set_no_mwait, "IFL91 board", { | |
32 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
33 | DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"), | |
34 | DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"), | |
35 | DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL}, | |
36 | { | |
37 | set_no_mwait, "Extensa 5220", { | |
38 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
39 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), | |
40 | DMI_MATCH(DMI_PRODUCT_VERSION, "0100"), | |
41 | DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL}, | |
42 | {}, | |
43 | }; | |
44 | ||
08ea48a3 AC |
45 | static void acpi_set_pdc_bits(u32 *buf) |
46 | { | |
47 | buf[0] = ACPI_PDC_REVISION_ID; | |
48 | buf[1] = 1; | |
49 | ||
50 | /* Enable coordination with firmware's _TSD info */ | |
51 | buf[2] = ACPI_PDC_SMP_T_SWCOORD; | |
6c5807d7 AC |
52 | |
53 | /* Twiddle arch-specific bits needed for _PDC */ | |
54 | arch_acpi_set_pdc_bits(buf); | |
08ea48a3 AC |
55 | } |
56 | ||
3b407aef | 57 | static struct acpi_object_list *acpi_processor_alloc_pdc(void) |
407cd87c AC |
58 | { |
59 | struct acpi_object_list *obj_list; | |
60 | union acpi_object *obj; | |
61 | u32 *buf; | |
62 | ||
407cd87c AC |
63 | /* allocate and initialize pdc. It will be used later. */ |
64 | obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); | |
65 | if (!obj_list) { | |
66 | printk(KERN_ERR "Memory allocation error\n"); | |
3b407aef | 67 | return NULL; |
407cd87c AC |
68 | } |
69 | ||
70 | obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); | |
71 | if (!obj) { | |
72 | printk(KERN_ERR "Memory allocation error\n"); | |
73 | kfree(obj_list); | |
3b407aef | 74 | return NULL; |
407cd87c AC |
75 | } |
76 | ||
77 | buf = kmalloc(12, GFP_KERNEL); | |
78 | if (!buf) { | |
79 | printk(KERN_ERR "Memory allocation error\n"); | |
80 | kfree(obj); | |
81 | kfree(obj_list); | |
3b407aef | 82 | return NULL; |
407cd87c AC |
83 | } |
84 | ||
08ea48a3 AC |
85 | acpi_set_pdc_bits(buf); |
86 | ||
407cd87c AC |
87 | obj->type = ACPI_TYPE_BUFFER; |
88 | obj->buffer.length = 12; | |
89 | obj->buffer.pointer = (u8 *) buf; | |
90 | obj_list->count = 1; | |
91 | obj_list->pointer = obj; | |
407cd87c | 92 | |
3b407aef | 93 | return obj_list; |
407cd87c AC |
94 | } |
95 | ||
78f16996 AC |
96 | /* |
97 | * _PDC is required for a BIOS-OS handshake for most of the newer | |
98 | * ACPI processor features. | |
99 | */ | |
100 | static int acpi_processor_eval_pdc(struct acpi_processor *pr) | |
101 | { | |
102 | struct acpi_object_list *pdc_in = pr->pdc; | |
103 | acpi_status status = AE_OK; | |
104 | ||
105 | if (!pdc_in) | |
106 | return status; | |
107 | if (idle_nomwait) { | |
108 | /* | |
109 | * If mwait is disabled for CPU C-states, the C2C3_FFH access | |
110 | * mode will be disabled in the parameter of _PDC object. | |
111 | * Of course C1_FFH access mode will also be disabled. | |
112 | */ | |
113 | union acpi_object *obj; | |
114 | u32 *buffer = NULL; | |
115 | ||
116 | obj = pdc_in->pointer; | |
117 | buffer = (u32 *)(obj->buffer.pointer); | |
118 | buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); | |
119 | ||
120 | } | |
121 | status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL); | |
122 | ||
123 | if (ACPI_FAILURE(status)) | |
124 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
125 | "Could not evaluate _PDC, using legacy perf. control.\n")); | |
126 | ||
127 | return status; | |
128 | } | |
129 | ||
47817254 AC |
130 | static void acpi_processor_cleanup_pdc(struct acpi_processor *pr) |
131 | { | |
132 | if (pr->pdc) { | |
133 | kfree(pr->pdc->pointer->buffer.pointer); | |
134 | kfree(pr->pdc->pointer); | |
135 | kfree(pr->pdc); | |
136 | pr->pdc = NULL; | |
137 | } | |
138 | } | |
139 | ||
78f16996 AC |
140 | void acpi_processor_set_pdc(struct acpi_processor *pr) |
141 | { | |
3b407aef AC |
142 | struct acpi_object_list *obj_list; |
143 | ||
1d9cb470 AC |
144 | if (arch_has_acpi_pdc() == false) |
145 | return; | |
146 | ||
3b407aef AC |
147 | obj_list = acpi_processor_alloc_pdc(); |
148 | if (!obj_list) | |
149 | return; | |
150 | ||
151 | pr->pdc = obj_list; | |
152 | ||
78f16996 | 153 | acpi_processor_eval_pdc(pr); |
47817254 | 154 | acpi_processor_cleanup_pdc(pr); |
78f16996 AC |
155 | } |
156 | EXPORT_SYMBOL_GPL(acpi_processor_set_pdc); | |
157 | ||
158 | static acpi_status | |
159 | early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) | |
160 | { | |
161 | struct acpi_processor pr; | |
162 | ||
163 | pr.handle = handle; | |
164 | ||
165 | /* x86 implementation looks at pr.id to determine some | |
166 | * CPU capabilites. We can just hard code to 0 since we're | |
167 | * assuming the CPUs in the system are homogenous and all | |
168 | * have the same capabilities. | |
169 | */ | |
170 | pr.id = 0; | |
171 | ||
172 | acpi_processor_set_pdc(&pr); | |
173 | ||
174 | return AE_OK; | |
175 | } | |
176 | ||
177 | void acpi_early_processor_set_pdc(void) | |
178 | { | |
179 | /* | |
180 | * Check whether the system is DMI table. If yes, OSPM | |
181 | * should not use mwait for CPU-states. | |
182 | */ | |
183 | dmi_check_system(processor_idle_dmi_table); | |
184 | ||
185 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, | |
186 | ACPI_UINT32_MAX, | |
187 | early_init_pdc, NULL, NULL, NULL); | |
188 | } |