Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[linux-2.6] / arch / x86 / kernel / acpi / processor.c
1 /*
2  * Copyright (C) 2005 Intel Corporation
3  *      Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
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
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;
53         if (cpu_has(c, X86_FEATURE_EST))
54                 buf[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP;
55
56         if (cpu_has(c, X86_FEATURE_ACPI))
57                 buf[2] |= ACPI_PDC_T_FFH;
58
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
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
75 /* Initialize _PDC data based on the CPU vendor */
76 void arch_acpi_processor_init_pdc(struct acpi_processor *pr)
77 {
78         struct cpuinfo_x86 *c = &cpu_data(pr->id);
79
80         pr->pdc = NULL;
81         if (c->x86_vendor == X86_VENDOR_INTEL)
82                 init_intel_pdc(pr, c);
83
84         return;
85 }
86
87 EXPORT_SYMBOL(arch_acpi_processor_init_pdc);