Alex Chiang | 4781725 | 2009-12-20 12:19:34 -0700 | [diff] [blame] | 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 | */ |
Paul Gortmaker | 214f2c9 | 2011-10-26 16:22:14 -0400 | [diff] [blame] | 10 | #include <linux/export.h> |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 11 | #include <linux/dmi.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 12 | #include <linux/slab.h> |
Lv Zheng | 8b48463 | 2013-12-03 08:49:16 +0800 | [diff] [blame] | 13 | #include <linux/acpi.h> |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 14 | #include <acpi/processor.h> |
| 15 | |
| 16 | #include "internal.h" |
| 17 | |
| 18 | #define PREFIX "ACPI: " |
| 19 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
Alex Chiang | 4d5d4cd | 2010-02-22 12:11:14 -0700 | [diff] [blame] | 20 | ACPI_MODULE_NAME("processor_core"); |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 21 | |
Jan Beulich | 6430c9c | 2011-02-17 16:33:53 +0000 | [diff] [blame] | 22 | static int __init set_no_mwait(const struct dmi_system_id *id) |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 23 | { |
| 24 | printk(KERN_NOTICE PREFIX "%s detected - " |
| 25 | "disabling mwait for CPU C-states\n", id->ident); |
Thomas Renninger | d189604 | 2010-11-03 17:06:14 +0100 | [diff] [blame] | 26 | boot_option_idle_override = IDLE_NOMWAIT; |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 27 | return 0; |
| 28 | } |
| 29 | |
Sachin Kamat | 8ef9fc7 | 2013-08-07 17:16:56 +0530 | [diff] [blame] | 30 | static struct dmi_system_id processor_idle_dmi_table[] __initdata = { |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 31 | { |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 32 | set_no_mwait, "Extensa 5220", { |
| 33 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 34 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), |
| 35 | DMI_MATCH(DMI_PRODUCT_VERSION, "0100"), |
| 36 | DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL}, |
| 37 | {}, |
| 38 | }; |
| 39 | |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 40 | static int map_lapic_id(struct acpi_subtable_header *entry, |
| 41 | u32 acpi_id, int *apic_id) |
| 42 | { |
| 43 | struct acpi_madt_local_apic *lapic = |
| 44 | (struct acpi_madt_local_apic *)entry; |
Alex Chiang | 1113073 | 2010-02-22 12:11:44 -0700 | [diff] [blame] | 45 | |
| 46 | if (!(lapic->lapic_flags & ACPI_MADT_ENABLED)) |
Hanjun Guo | 038d7b5 | 2014-01-17 12:37:02 +0800 | [diff] [blame] | 47 | return -ENODEV; |
Alex Chiang | 1113073 | 2010-02-22 12:11:44 -0700 | [diff] [blame] | 48 | |
| 49 | if (lapic->processor_id != acpi_id) |
Hanjun Guo | 038d7b5 | 2014-01-17 12:37:02 +0800 | [diff] [blame] | 50 | return -EINVAL; |
Alex Chiang | 1113073 | 2010-02-22 12:11:44 -0700 | [diff] [blame] | 51 | |
| 52 | *apic_id = lapic->id; |
Hanjun Guo | 038d7b5 | 2014-01-17 12:37:02 +0800 | [diff] [blame] | 53 | return 0; |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 54 | } |
| 55 | |
| 56 | static int map_x2apic_id(struct acpi_subtable_header *entry, |
| 57 | int device_declaration, u32 acpi_id, int *apic_id) |
| 58 | { |
| 59 | struct acpi_madt_local_x2apic *apic = |
| 60 | (struct acpi_madt_local_x2apic *)entry; |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 61 | |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 62 | if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) |
Hanjun Guo | 038d7b5 | 2014-01-17 12:37:02 +0800 | [diff] [blame] | 63 | return -ENODEV; |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 64 | |
Alex Chiang | d674209 | 2010-02-22 12:11:50 -0700 | [diff] [blame] | 65 | if (device_declaration && (apic->uid == acpi_id)) { |
| 66 | *apic_id = apic->local_apic_id; |
Hanjun Guo | 038d7b5 | 2014-01-17 12:37:02 +0800 | [diff] [blame] | 67 | return 0; |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 68 | } |
| 69 | |
Hanjun Guo | 038d7b5 | 2014-01-17 12:37:02 +0800 | [diff] [blame] | 70 | return -EINVAL; |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | static int map_lsapic_id(struct acpi_subtable_header *entry, |
| 74 | int device_declaration, u32 acpi_id, int *apic_id) |
| 75 | { |
| 76 | struct acpi_madt_local_sapic *lsapic = |
| 77 | (struct acpi_madt_local_sapic *)entry; |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 78 | |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 79 | if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) |
Hanjun Guo | 038d7b5 | 2014-01-17 12:37:02 +0800 | [diff] [blame] | 80 | return -ENODEV; |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 81 | |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 82 | if (device_declaration) { |
Alex Chiang | eae701c | 2010-02-22 12:11:55 -0700 | [diff] [blame] | 83 | if ((entry->length < 16) || (lsapic->uid != acpi_id)) |
Hanjun Guo | 038d7b5 | 2014-01-17 12:37:02 +0800 | [diff] [blame] | 84 | return -EINVAL; |
Alex Chiang | eae701c | 2010-02-22 12:11:55 -0700 | [diff] [blame] | 85 | } else if (lsapic->processor_id != acpi_id) |
Hanjun Guo | 038d7b5 | 2014-01-17 12:37:02 +0800 | [diff] [blame] | 86 | return -EINVAL; |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 87 | |
Alex Chiang | eae701c | 2010-02-22 12:11:55 -0700 | [diff] [blame] | 88 | *apic_id = (lsapic->id << 8) | lsapic->eid; |
Hanjun Guo | 038d7b5 | 2014-01-17 12:37:02 +0800 | [diff] [blame] | 89 | return 0; |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | static int map_madt_entry(int type, u32 acpi_id) |
| 93 | { |
| 94 | unsigned long madt_end, entry; |
Alex Chiang | 149fe9c | 2010-02-22 12:12:00 -0700 | [diff] [blame] | 95 | static struct acpi_table_madt *madt; |
| 96 | static int read_madt; |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 97 | int apic_id = -1; |
| 98 | |
Alex Chiang | 149fe9c | 2010-02-22 12:12:00 -0700 | [diff] [blame] | 99 | if (!read_madt) { |
| 100 | if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, |
| 101 | (struct acpi_table_header **)&madt))) |
| 102 | madt = NULL; |
| 103 | read_madt++; |
| 104 | } |
| 105 | |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 106 | if (!madt) |
| 107 | return apic_id; |
| 108 | |
| 109 | entry = (unsigned long)madt; |
| 110 | madt_end = entry + madt->header.length; |
| 111 | |
| 112 | /* Parse all entries looking for a match. */ |
| 113 | |
| 114 | entry += sizeof(struct acpi_table_madt); |
| 115 | while (entry + sizeof(struct acpi_subtable_header) < madt_end) { |
| 116 | struct acpi_subtable_header *header = |
| 117 | (struct acpi_subtable_header *)entry; |
| 118 | if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { |
Hanjun Guo | 038d7b5 | 2014-01-17 12:37:02 +0800 | [diff] [blame] | 119 | if (!map_lapic_id(header, acpi_id, &apic_id)) |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 120 | break; |
| 121 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { |
Hanjun Guo | 038d7b5 | 2014-01-17 12:37:02 +0800 | [diff] [blame] | 122 | if (!map_x2apic_id(header, type, acpi_id, &apic_id)) |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 123 | break; |
| 124 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { |
Hanjun Guo | 038d7b5 | 2014-01-17 12:37:02 +0800 | [diff] [blame] | 125 | if (!map_lsapic_id(header, type, acpi_id, &apic_id)) |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 126 | break; |
| 127 | } |
| 128 | entry += header->length; |
| 129 | } |
| 130 | return apic_id; |
| 131 | } |
| 132 | |
| 133 | static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id) |
| 134 | { |
| 135 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 136 | union acpi_object *obj; |
| 137 | struct acpi_subtable_header *header; |
| 138 | int apic_id = -1; |
| 139 | |
| 140 | if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) |
| 141 | goto exit; |
| 142 | |
| 143 | if (!buffer.length || !buffer.pointer) |
| 144 | goto exit; |
| 145 | |
| 146 | obj = buffer.pointer; |
| 147 | if (obj->type != ACPI_TYPE_BUFFER || |
| 148 | obj->buffer.length < sizeof(struct acpi_subtable_header)) { |
| 149 | goto exit; |
| 150 | } |
| 151 | |
| 152 | header = (struct acpi_subtable_header *)obj->buffer.pointer; |
| 153 | if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { |
| 154 | map_lapic_id(header, acpi_id, &apic_id); |
| 155 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { |
| 156 | map_lsapic_id(header, type, acpi_id, &apic_id); |
| 157 | } |
| 158 | |
| 159 | exit: |
Syam Sidhardhan | 5273a25 | 2013-02-24 23:12:53 +0000 | [diff] [blame] | 160 | kfree(buffer.pointer); |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 161 | return apic_id; |
| 162 | } |
| 163 | |
Jiang Liu | ca9f62a | 2013-09-02 11:57:34 +0800 | [diff] [blame] | 164 | int acpi_get_apicid(acpi_handle handle, int type, u32 acpi_id) |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 165 | { |
Jiang Liu | ca9f62a | 2013-09-02 11:57:34 +0800 | [diff] [blame] | 166 | int apic_id; |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 167 | |
| 168 | apic_id = map_mat_entry(handle, type, acpi_id); |
| 169 | if (apic_id == -1) |
| 170 | apic_id = map_madt_entry(type, acpi_id); |
Jiang Liu | ca9f62a | 2013-09-02 11:57:34 +0800 | [diff] [blame] | 171 | |
| 172 | return apic_id; |
| 173 | } |
| 174 | |
| 175 | int acpi_map_cpuid(int apic_id, u32 acpi_id) |
| 176 | { |
| 177 | #ifdef CONFIG_SMP |
| 178 | int i; |
| 179 | #endif |
| 180 | |
Lin Ming | d640113 | 2011-12-13 09:36:03 +0800 | [diff] [blame] | 181 | if (apic_id == -1) { |
| 182 | /* |
| 183 | * On UP processor, there is no _MAT or MADT table. |
| 184 | * So above apic_id is always set to -1. |
| 185 | * |
| 186 | * BIOS may define multiple CPU handles even for UP processor. |
| 187 | * For example, |
| 188 | * |
| 189 | * Scope (_PR) |
| 190 | * { |
| 191 | * Processor (CPU0, 0x00, 0x00000410, 0x06) {} |
| 192 | * Processor (CPU1, 0x01, 0x00000410, 0x06) {} |
| 193 | * Processor (CPU2, 0x02, 0x00000410, 0x06) {} |
| 194 | * Processor (CPU3, 0x03, 0x00000410, 0x06) {} |
| 195 | * } |
| 196 | * |
Thomas Renninger | c4686c7 | 2012-07-12 12:24:33 +0200 | [diff] [blame] | 197 | * Ignores apic_id and always returns 0 for the processor |
| 198 | * handle with acpi id 0 if nr_cpu_ids is 1. |
| 199 | * This should be the case if SMP tables are not found. |
Lin Ming | d640113 | 2011-12-13 09:36:03 +0800 | [diff] [blame] | 200 | * Return -1 for other CPU's handle. |
| 201 | */ |
Thomas Renninger | c4686c7 | 2012-07-12 12:24:33 +0200 | [diff] [blame] | 202 | if (nr_cpu_ids <= 1 && acpi_id == 0) |
Lin Ming | d640113 | 2011-12-13 09:36:03 +0800 | [diff] [blame] | 203 | return acpi_id; |
| 204 | else |
| 205 | return apic_id; |
| 206 | } |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 207 | |
Lin Ming | 932df74 | 2011-05-16 09:11:00 +0800 | [diff] [blame] | 208 | #ifdef CONFIG_SMP |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 209 | for_each_possible_cpu(i) { |
| 210 | if (cpu_physical_id(i) == apic_id) |
| 211 | return i; |
| 212 | } |
Lin Ming | 932df74 | 2011-05-16 09:11:00 +0800 | [diff] [blame] | 213 | #else |
| 214 | /* In UP kernel, only processor 0 is valid */ |
| 215 | if (apic_id == 0) |
| 216 | return apic_id; |
| 217 | #endif |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 218 | return -1; |
| 219 | } |
Jiang Liu | ca9f62a | 2013-09-02 11:57:34 +0800 | [diff] [blame] | 220 | |
| 221 | int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) |
| 222 | { |
| 223 | int apic_id; |
| 224 | |
| 225 | apic_id = acpi_get_apicid(handle, type, acpi_id); |
| 226 | |
| 227 | return acpi_map_cpuid(apic_id, acpi_id); |
| 228 | } |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 229 | EXPORT_SYMBOL_GPL(acpi_get_cpuid); |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 230 | |
Jan Beulich | 6430c9c | 2011-02-17 16:33:53 +0000 | [diff] [blame] | 231 | static bool __init processor_physically_present(acpi_handle handle) |
Alex Chiang | 5d554a7 | 2010-02-22 12:11:29 -0700 | [diff] [blame] | 232 | { |
| 233 | int cpuid, type; |
| 234 | u32 acpi_id; |
| 235 | acpi_status status; |
| 236 | acpi_object_type acpi_type; |
| 237 | unsigned long long tmp; |
| 238 | union acpi_object object = { 0 }; |
| 239 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; |
| 240 | |
| 241 | status = acpi_get_type(handle, &acpi_type); |
| 242 | if (ACPI_FAILURE(status)) |
| 243 | return false; |
| 244 | |
| 245 | switch (acpi_type) { |
| 246 | case ACPI_TYPE_PROCESSOR: |
| 247 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
| 248 | if (ACPI_FAILURE(status)) |
| 249 | return false; |
| 250 | acpi_id = object.processor.proc_id; |
| 251 | break; |
| 252 | case ACPI_TYPE_DEVICE: |
| 253 | status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp); |
| 254 | if (ACPI_FAILURE(status)) |
| 255 | return false; |
| 256 | acpi_id = tmp; |
| 257 | break; |
| 258 | default: |
| 259 | return false; |
| 260 | } |
| 261 | |
| 262 | type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; |
| 263 | cpuid = acpi_get_cpuid(handle, type, acpi_id); |
| 264 | |
Lin Ming | 932df74 | 2011-05-16 09:11:00 +0800 | [diff] [blame] | 265 | if (cpuid == -1) |
Alex Chiang | 5d554a7 | 2010-02-22 12:11:29 -0700 | [diff] [blame] | 266 | return false; |
| 267 | |
| 268 | return true; |
| 269 | } |
Alex Chiang | 78ed8bd | 2010-02-22 12:11:24 -0700 | [diff] [blame] | 270 | |
Paul Gortmaker | fe7bf10 | 2013-06-19 14:30:58 -0400 | [diff] [blame] | 271 | static void acpi_set_pdc_bits(u32 *buf) |
Alex Chiang | 08ea48a | 2009-12-20 12:19:24 -0700 | [diff] [blame] | 272 | { |
| 273 | buf[0] = ACPI_PDC_REVISION_ID; |
| 274 | buf[1] = 1; |
| 275 | |
| 276 | /* Enable coordination with firmware's _TSD info */ |
| 277 | buf[2] = ACPI_PDC_SMP_T_SWCOORD; |
Alex Chiang | 6c5807d | 2009-12-20 12:19:29 -0700 | [diff] [blame] | 278 | |
| 279 | /* Twiddle arch-specific bits needed for _PDC */ |
| 280 | arch_acpi_set_pdc_bits(buf); |
Alex Chiang | 08ea48a | 2009-12-20 12:19:24 -0700 | [diff] [blame] | 281 | } |
| 282 | |
Paul Gortmaker | fe7bf10 | 2013-06-19 14:30:58 -0400 | [diff] [blame] | 283 | static struct acpi_object_list *acpi_processor_alloc_pdc(void) |
Alex Chiang | 407cd87 | 2009-12-20 12:19:19 -0700 | [diff] [blame] | 284 | { |
| 285 | struct acpi_object_list *obj_list; |
| 286 | union acpi_object *obj; |
| 287 | u32 *buf; |
| 288 | |
Alex Chiang | 407cd87 | 2009-12-20 12:19:19 -0700 | [diff] [blame] | 289 | /* allocate and initialize pdc. It will be used later. */ |
| 290 | obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); |
| 291 | if (!obj_list) { |
| 292 | printk(KERN_ERR "Memory allocation error\n"); |
Alex Chiang | 3b407ae | 2009-12-20 12:19:39 -0700 | [diff] [blame] | 293 | return NULL; |
Alex Chiang | 407cd87 | 2009-12-20 12:19:19 -0700 | [diff] [blame] | 294 | } |
| 295 | |
| 296 | obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); |
| 297 | if (!obj) { |
| 298 | printk(KERN_ERR "Memory allocation error\n"); |
| 299 | kfree(obj_list); |
Alex Chiang | 3b407ae | 2009-12-20 12:19:39 -0700 | [diff] [blame] | 300 | return NULL; |
Alex Chiang | 407cd87 | 2009-12-20 12:19:19 -0700 | [diff] [blame] | 301 | } |
| 302 | |
| 303 | buf = kmalloc(12, GFP_KERNEL); |
| 304 | if (!buf) { |
| 305 | printk(KERN_ERR "Memory allocation error\n"); |
| 306 | kfree(obj); |
| 307 | kfree(obj_list); |
Alex Chiang | 3b407ae | 2009-12-20 12:19:39 -0700 | [diff] [blame] | 308 | return NULL; |
Alex Chiang | 407cd87 | 2009-12-20 12:19:19 -0700 | [diff] [blame] | 309 | } |
| 310 | |
Alex Chiang | 08ea48a | 2009-12-20 12:19:24 -0700 | [diff] [blame] | 311 | acpi_set_pdc_bits(buf); |
| 312 | |
Alex Chiang | 407cd87 | 2009-12-20 12:19:19 -0700 | [diff] [blame] | 313 | obj->type = ACPI_TYPE_BUFFER; |
| 314 | obj->buffer.length = 12; |
| 315 | obj->buffer.pointer = (u8 *) buf; |
| 316 | obj_list->count = 1; |
| 317 | obj_list->pointer = obj; |
Alex Chiang | 407cd87 | 2009-12-20 12:19:19 -0700 | [diff] [blame] | 318 | |
Alex Chiang | 3b407ae | 2009-12-20 12:19:39 -0700 | [diff] [blame] | 319 | return obj_list; |
Alex Chiang | 407cd87 | 2009-12-20 12:19:19 -0700 | [diff] [blame] | 320 | } |
| 321 | |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 322 | /* |
| 323 | * _PDC is required for a BIOS-OS handshake for most of the newer |
| 324 | * ACPI processor features. |
| 325 | */ |
Hanjun Guo | 1606484 | 2014-02-08 20:46:26 +0800 | [diff] [blame^] | 326 | static acpi_status |
Alex Chiang | fa11856 | 2009-12-20 12:19:45 -0700 | [diff] [blame] | 327 | acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in) |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 328 | { |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 329 | acpi_status status = AE_OK; |
| 330 | |
Thomas Renninger | d189604 | 2010-11-03 17:06:14 +0100 | [diff] [blame] | 331 | if (boot_option_idle_override == IDLE_NOMWAIT) { |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 332 | /* |
| 333 | * If mwait is disabled for CPU C-states, the C2C3_FFH access |
| 334 | * mode will be disabled in the parameter of _PDC object. |
| 335 | * Of course C1_FFH access mode will also be disabled. |
| 336 | */ |
| 337 | union acpi_object *obj; |
| 338 | u32 *buffer = NULL; |
| 339 | |
| 340 | obj = pdc_in->pointer; |
| 341 | buffer = (u32 *)(obj->buffer.pointer); |
| 342 | buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); |
| 343 | |
| 344 | } |
Alex Chiang | fa11856 | 2009-12-20 12:19:45 -0700 | [diff] [blame] | 345 | status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL); |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 346 | |
| 347 | if (ACPI_FAILURE(status)) |
| 348 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 349 | "Could not evaluate _PDC, using legacy perf. control.\n")); |
| 350 | |
| 351 | return status; |
| 352 | } |
| 353 | |
Paul Gortmaker | fe7bf10 | 2013-06-19 14:30:58 -0400 | [diff] [blame] | 354 | void acpi_processor_set_pdc(acpi_handle handle) |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 355 | { |
Alex Chiang | 3b407ae | 2009-12-20 12:19:39 -0700 | [diff] [blame] | 356 | struct acpi_object_list *obj_list; |
| 357 | |
Alex Chiang | 1d9cb47 | 2009-12-20 12:19:14 -0700 | [diff] [blame] | 358 | if (arch_has_acpi_pdc() == false) |
| 359 | return; |
| 360 | |
Alex Chiang | 3b407ae | 2009-12-20 12:19:39 -0700 | [diff] [blame] | 361 | obj_list = acpi_processor_alloc_pdc(); |
| 362 | if (!obj_list) |
| 363 | return; |
| 364 | |
Alex Chiang | 43bab25 | 2009-12-20 12:23:16 -0700 | [diff] [blame] | 365 | acpi_processor_eval_pdc(handle, obj_list); |
Alex Chiang | b9c2db7 | 2009-12-20 12:23:11 -0700 | [diff] [blame] | 366 | |
| 367 | kfree(obj_list->pointer->buffer.pointer); |
| 368 | kfree(obj_list->pointer); |
| 369 | kfree(obj_list); |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 370 | } |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 371 | |
Jan Beulich | 6430c9c | 2011-02-17 16:33:53 +0000 | [diff] [blame] | 372 | static acpi_status __init |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 373 | early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) |
| 374 | { |
Alex Chiang | 5d554a7 | 2010-02-22 12:11:29 -0700 | [diff] [blame] | 375 | if (processor_physically_present(handle) == false) |
| 376 | return AE_OK; |
| 377 | |
Alex Chiang | 43bab25 | 2009-12-20 12:23:16 -0700 | [diff] [blame] | 378 | acpi_processor_set_pdc(handle); |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 379 | return AE_OK; |
| 380 | } |
| 381 | |
Luck, Tony | 7a0b73a | 2009-12-28 10:39:23 -0800 | [diff] [blame] | 382 | void __init acpi_early_processor_set_pdc(void) |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 383 | { |
| 384 | /* |
| 385 | * Check whether the system is DMI table. If yes, OSPM |
| 386 | * should not use mwait for CPU-states. |
| 387 | */ |
| 388 | dmi_check_system(processor_idle_dmi_table); |
| 389 | |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 390 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, |
| 391 | ACPI_UINT32_MAX, |
| 392 | early_init_pdc, NULL, NULL, NULL); |
Yinghai Lu | c1e0ddb | 2010-09-17 23:26:24 -0700 | [diff] [blame] | 393 | acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL); |
Alex Chiang | 78f1699 | 2009-12-20 12:19:09 -0700 | [diff] [blame] | 394 | } |