![Mike Travis](/assets/img/avatar_default.png)
cpu_data is currently an array defined using NR_CPUS. This means that we overallocate since we will rarely really use maximum configured cpus. When NR_CPU count is raised to 4096 the size of cpu_data becomes 3,145,728 bytes. These changes were adopted from the sparc64 (and ia64) code. An additional field was added to cpuinfo_x86 to be a non-ambiguous cpu index. This corresponds to the index into a cpumask_t as well as the per_cpu index. It's used in various places like show_cpuinfo(). cpu_data is defined to be the boot_cpu_data structure for the NON-SMP case. Signed-off-by: Mike Travis <travis@sgi.com> Acked-by: Christoph Lameter <clameter@sgi.com> Cc: Andi Kleen <ak@suse.de> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Dmitry Torokhov <dtor@mail.ru> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: Mark M. Hoffman <mhoffman@lightlink.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
/*
|
|
* arch/i386/kernel/acpi/processor.c
|
|
*
|
|
* Copyright (C) 2005 Intel Corporation
|
|
* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
|
|
* - Added _PDC for platforms with Intel CPUs
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/acpi.h>
|
|
|
|
#include <acpi/processor.h>
|
|
#include <asm/acpi.h>
|
|
|
|
static void init_intel_pdc(struct acpi_processor *pr, struct cpuinfo_x86 *c)
|
|
{
|
|
struct acpi_object_list *obj_list;
|
|
union acpi_object *obj;
|
|
u32 *buf;
|
|
|
|
/* allocate and initialize pdc. It will be used later. */
|
|
obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
|
|
if (!obj_list) {
|
|
printk(KERN_ERR "Memory allocation error\n");
|
|
return;
|
|
}
|
|
|
|
obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
|
|
if (!obj) {
|
|
printk(KERN_ERR "Memory allocation error\n");
|
|
kfree(obj_list);
|
|
return;
|
|
}
|
|
|
|
buf = kmalloc(12, GFP_KERNEL);
|
|
if (!buf) {
|
|
printk(KERN_ERR "Memory allocation error\n");
|
|
kfree(obj);
|
|
kfree(obj_list);
|
|
return;
|
|
}
|
|
|
|
buf[0] = ACPI_PDC_REVISION_ID;
|
|
buf[1] = 1;
|
|
buf[2] = ACPI_PDC_C_CAPABILITY_SMP;
|
|
|
|
if (cpu_has(c, X86_FEATURE_EST))
|
|
buf[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP;
|
|
|
|
obj->type = ACPI_TYPE_BUFFER;
|
|
obj->buffer.length = 12;
|
|
obj->buffer.pointer = (u8 *) buf;
|
|
obj_list->count = 1;
|
|
obj_list->pointer = obj;
|
|
pr->pdc = obj_list;
|
|
|
|
return;
|
|
}
|
|
|
|
/* Initialize _PDC data based on the CPU vendor */
|
|
void arch_acpi_processor_init_pdc(struct acpi_processor *pr)
|
|
{
|
|
unsigned int cpu = pr->id;
|
|
struct cpuinfo_x86 *c = &cpu_data(cpu);
|
|
|
|
pr->pdc = NULL;
|
|
if (c->x86_vendor == X86_VENDOR_INTEL)
|
|
init_intel_pdc(pr, c);
|
|
|
|
return;
|
|
}
|
|
|
|
EXPORT_SYMBOL(arch_acpi_processor_init_pdc);
|