ia64/linux-2.6.18-xen.hg

view arch/i386/kernel/acpi/processor.c @ 533:d62d60eaba6e

Handle dom0_max_vcpus < nr_pcpu cases, e.g. UP dom0.

Just try to pass info about all acpi processors to xen even in such cases.

Signed-off-by: Tian Kevin <kevin.tian@intel.com>
Signed-off-by: Wei Gang <gang.wei@intel.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu May 01 10:53:37 2008 +0100 (2008-05-01)
parents 831230e53067
children e39cf97647af
line source
1 /*
2 * arch/i386/kernel/acpi/processor.c
3 *
4 * Copyright (C) 2005 Intel Corporation
5 * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
6 * - Added _PDC for platforms with Intel CPUs
7 */
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/acpi.h>
14 #include <acpi/processor.h>
15 #include <asm/acpi.h>
17 static void init_intel_pdc(struct acpi_processor *pr, struct cpuinfo_x86 *c)
18 {
19 struct acpi_object_list *obj_list;
20 union acpi_object *obj;
21 u32 *buf;
23 /* allocate and initialize pdc. It will be used later. */
24 obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
25 if (!obj_list) {
26 printk(KERN_ERR "Memory allocation error\n");
27 return;
28 }
30 obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
31 if (!obj) {
32 printk(KERN_ERR "Memory allocation error\n");
33 kfree(obj_list);
34 return;
35 }
37 buf = kmalloc(12, GFP_KERNEL);
38 if (!buf) {
39 printk(KERN_ERR "Memory allocation error\n");
40 kfree(obj);
41 kfree(obj_list);
42 return;
43 }
45 buf[0] = ACPI_PDC_REVISION_ID;
46 buf[1] = 1;
47 buf[2] = ACPI_PDC_C_CAPABILITY_SMP;
49 if (cpu_has(c, X86_FEATURE_EST))
50 buf[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP;
52 obj->type = ACPI_TYPE_BUFFER;
53 obj->buffer.length = 12;
54 obj->buffer.pointer = (u8 *) buf;
55 obj_list->count = 1;
56 obj_list->pointer = obj;
57 pr->pdc = obj_list;
59 return;
60 }
62 /*
63 * Initialize _PDC data based on the CPU vendor. As a work-around, just
64 * use cpu0's cpuinfo for all processors. Further work is required
65 * to expose xen hypervisor interface of getting physical cpuinfo to dom0
66 * kerneland then arch_acpi_processor_init_pdc can set _PDC parameters
67 * according to Xen's phys information.
68 */
69 void arch_acpi_processor_init_pdc(struct acpi_processor *pr)
70 {
71 unsigned int cpu = 0;
72 struct cpuinfo_x86 *c = cpu_data + cpu;
74 pr->pdc = NULL;
75 if (c->x86_vendor == X86_VENDOR_INTEL)
76 init_intel_pdc(pr, c);
78 return;
79 }
81 EXPORT_SYMBOL(arch_acpi_processor_init_pdc);