probe.c 3.3 KB
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/*
 * Copyright 2003 Andi Kleen, SuSE Labs.
 * Subject to the GNU Public License, v.2
 *
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 * Generic x86 APIC driver probe layer.
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 */
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#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/init.h>
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#include <linux/errno.h>
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#include <asm/fixmap.h>
#include <asm/mpspec.h>
#include <asm/apicdef.h>
#include <asm/genapic.h>
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#include <asm/setup.h>
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extern struct genapic apic_numaq;
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extern struct genapic apic_summit;
extern struct genapic apic_bigsmp;
extern struct genapic apic_es7000;
extern struct genapic apic_default;

struct genapic *genapic = &apic_default;

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static struct genapic *apic_probe[] __initdata = {
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#ifdef CONFIG_X86_NUMAQ
	&apic_numaq,
#endif
#ifdef CONFIG_X86_SUMMIT
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	&apic_summit,
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#endif
#ifdef CONFIG_X86_BIGSMP
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	&apic_bigsmp,
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#endif
#ifdef CONFIG_X86_ES7000
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	&apic_es7000,
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#endif
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	&apic_default,	/* must be last */
	NULL,
};

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static int cmdline_apic __initdata;
static int __init parse_apic(char *arg)
{
	int i;

	if (!arg)
		return -EINVAL;

	for (i = 0; apic_probe[i]; i++) {
		if (!strcmp(apic_probe[i]->name, arg)) {
			genapic = apic_probe[i];
			cmdline_apic = 1;
			return 0;
		}
	}
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	if (x86_quirks->update_genapic)
		x86_quirks->update_genapic();

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	/* Parsed again by __setup for debug/verbose */
	return 0;
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}
early_param("apic", parse_apic);
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void __init generic_bigsmp_probe(void)
{
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#ifdef CONFIG_X86_BIGSMP
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	/*
	 * This routine is used to switch to bigsmp mode when
	 * - There is no apic= option specified by the user
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	 * - generic_apic_probe() has chosen apic_default as the sub_arch
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	 * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
	 */

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	if (!cmdline_apic && genapic == &apic_default) {
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		if (apic_bigsmp.probe()) {
			genapic = &apic_bigsmp;
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			if (x86_quirks->update_genapic)
				x86_quirks->update_genapic();
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			printk(KERN_INFO "Overriding APIC driver with %s\n",
			       genapic->name);
		}
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	}
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#endif
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}

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void __init generic_apic_probe(void)
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{
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	if (!cmdline_apic) {
		int i;
		for (i = 0; apic_probe[i]; i++) {
			if (apic_probe[i]->probe()) {
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				genapic = apic_probe[i];
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				break;
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			}
		}
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		/* Not visible without early console */
		if (!apic_probe[i])
			panic("Didn't find an APIC driver");
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		if (x86_quirks->update_genapic)
			x86_quirks->update_genapic();
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	}
	printk(KERN_INFO "Using APIC driver %s\n", genapic->name);
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}
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/* These functions can switch the APIC even after the initial ->probe() */

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int __init mps_oem_check(struct mp_config_table *mpc, char *oem,
				 char *productid)
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{
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	int i;
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	for (i = 0; apic_probe[i]; ++i) {
		if (apic_probe[i]->mps_oem_check(mpc, oem, productid)) {
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			if (!cmdline_apic) {
				genapic = apic_probe[i];
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				if (x86_quirks->update_genapic)
					x86_quirks->update_genapic();
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				printk(KERN_INFO "Switched to APIC driver `%s'.\n",
				       genapic->name);
			}
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			return 1;
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		}
	}
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	return 0;
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}
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int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
	int i;
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	for (i = 0; apic_probe[i]; ++i) {
		if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
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			if (!cmdline_apic) {
				genapic = apic_probe[i];
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				if (x86_quirks->update_genapic)
					x86_quirks->update_genapic();
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				printk(KERN_INFO "Switched to APIC driver `%s'.\n",
				       genapic->name);
			}
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			return 1;
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		}
	}
	return 0;
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}

int hard_smp_processor_id(void)
{
	return genapic->get_apic_id(*(unsigned long *)(APIC_BASE+APIC_ID));
}