projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 05131ecc | 1 | /* |
| 05131ecc VP |
2 | * Copyright (C) 2005 Intel Corporation |
| 3 | * Venkatesh Pallipadi <[email protected]> | |
| 4 | * - Added _PDC for platforms with Intel CPUs | |
| 5 | */ | |
| 6 | ||
| 7 | #include <linux/kernel.h> | |
| 8 | #include <linux/module.h> | |
| 9 | #include <linux/init.h> | |
| 10 | #include <linux/acpi.h> | |
| 11 | ||
| 12 | #include <acpi/processor.h> | |
| 13 | #include <asm/acpi.h> | |
| 14 | ||
| 15 | static void init_intel_pdc(struct acpi_processor *pr, struct cpuinfo_x86 *c) | |
| 16 | { | |
| 17 | struct acpi_object_list *obj_list; | |
| 18 | union acpi_object *obj; | |
| 19 | u32 *buf; | |
| 20 | ||
| 21 | /* allocate and initialize pdc. It will be used later. */ | |
| 22 | obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); | |
| 23 | if (!obj_list) { | |
| 24 | printk(KERN_ERR "Memory allocation error\n"); | |
| 25 | return; | |
| 26 | } | |
| 27 | ||
| 28 | obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); | |
| 29 | if (!obj) { | |
| 30 | printk(KERN_ERR "Memory allocation error\n"); | |
| 31 | kfree(obj_list); | |
| 32 | return; | |
| 33 | } | |
| 34 | ||
| 35 | buf = kmalloc(12, GFP_KERNEL); | |
| 36 | if (!buf) { | |
| 37 | printk(KERN_ERR "Memory allocation error\n"); | |
| 38 | kfree(obj); | |
| 39 | kfree(obj_list); | |
| 40 | return; | |
| 41 | } | |
| 42 | ||
| 43 | buf[0] = ACPI_PDC_REVISION_ID; | |
| 44 | buf[1] = 1; | |
| 45 | buf[2] = ACPI_PDC_C_CAPABILITY_SMP; | |
| 46 | ||
| 3abbd337 ZY |
47 | /* |
| 48 | * The default of PDC_SMP_T_SWCOORD bit is set for intel x86 cpu so | |
| 49 | * that OSPM is capable of native ACPI throttling software | |
| 50 | * coordination using BIOS supplied _TSD info. | |
| 51 | */ | |
| 52 | buf[2] |= ACPI_PDC_SMP_T_SWCOORD; | |
| 05131ecc | 53 | if (cpu_has(c, X86_FEATURE_EST)) |
| d52bb94d | 54 | buf[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP; |
| 05131ecc | 55 | |
| f79f06ab ZY |
56 | if (cpu_has(c, X86_FEATURE_ACPI)) |
| 57 | buf[2] |= ACPI_PDC_T_FFH; | |
| 58 | ||
| 5b53496a ZY |
59 | /* |
| 60 | * If mwait/monitor is unsupported, C2/C3_FFH will be disabled | |
| 61 | */ | |
| 62 | if (!cpu_has(c, X86_FEATURE_MWAIT)) | |
| 63 | buf[2] &= ~(ACPI_PDC_C_C2C3_FFH); | |
| 64 | ||
| 05131ecc VP |
65 | obj->type = ACPI_TYPE_BUFFER; |
| 66 | obj->buffer.length = 12; | |
| 67 | obj->buffer.pointer = (u8 *) buf; | |
| 68 | obj_list->count = 1; | |
| 69 | obj_list->pointer = obj; | |
| 70 | pr->pdc = obj_list; | |
| 71 | ||
| 72 | return; | |
| 73 | } | |
| 74 | ||
| 7b768f07 | 75 | |
| 05131ecc VP |
76 | /* Initialize _PDC data based on the CPU vendor */ |
| 77 | void arch_acpi_processor_init_pdc(struct acpi_processor *pr) | |
| 78 | { | |
| 74a3d2d3 | 79 | struct cpuinfo_x86 *c = &cpu_data(pr->id); |
| 05131ecc VP |
80 | |
| 81 | pr->pdc = NULL; | |
| d77b8197 HW |
82 | if (c->x86_vendor == X86_VENDOR_INTEL || |
| 83 | c->x86_vendor == X86_VENDOR_CENTAUR) | |
| 05131ecc VP |
84 | init_intel_pdc(pr, c); |
| 85 | ||
| 86 | return; | |
| 87 | } | |
| 88 | ||
| 89 | EXPORT_SYMBOL(arch_acpi_processor_init_pdc); | |
| 7b768f07 PV |
90 | |
| 91 | void arch_acpi_processor_cleanup_pdc(struct acpi_processor *pr) | |
| 92 | { | |
| 93 | if (pr->pdc) { | |
| 94 | kfree(pr->pdc->pointer->buffer.pointer); | |
| 95 | kfree(pr->pdc->pointer); | |
| 96 | kfree(pr->pdc); | |
| 97 | pr->pdc = NULL; | |
| 98 | } | |
| 99 | } | |
| 100 | ||
| 101 | EXPORT_SYMBOL(arch_acpi_processor_cleanup_pdc); |