f6c133f7d5
Don't warn in read_apic_id() when preemptible but only one CPU online. Signed-off-by: Andi Kleen <andi@firstfloor.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
/*
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* Copyright 2004 James Cleverdon, IBM.
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* Subject to the GNU Public License, v.2
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*
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* Generic APIC sub-arch probe layer.
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*
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* Hacked for x86-64 by James Cleverdon from i386 architecture code by
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* Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
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* James Cleverdon.
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*/
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/ctype.h>
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#include <linux/init.h>
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#include <linux/hardirq.h>
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#include <asm/smp.h>
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#include <asm/ipi.h>
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#include <asm/genapic.h>
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#ifdef CONFIG_ACPI
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#include <acpi/acpi_bus.h>
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#endif
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DEFINE_PER_CPU(int, x2apic_extra_bits);
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struct genapic __read_mostly *genapic = &apic_flat;
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static enum uv_system_type uv_system_type;
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/*
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* Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
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*/
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void __init setup_apic_routing(void)
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{
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if (uv_system_type == UV_NON_UNIQUE_APIC)
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genapic = &apic_x2apic_uv_x;
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else
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#ifdef CONFIG_ACPI
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/*
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* Quirk: some x86_64 machines can only use physical APIC mode
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* regardless of how many processors are present (x86_64 ES7000
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* is an example).
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*/
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if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
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(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL))
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genapic = &apic_physflat;
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else
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#endif
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if (num_possible_cpus() <= 8)
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genapic = &apic_flat;
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else
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genapic = &apic_physflat;
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printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
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}
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/* Same for both flat and physical. */
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void send_IPI_self(int vector)
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{
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__send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
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}
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int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
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{
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if (!strcmp(oem_id, "SGI")) {
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if (!strcmp(oem_table_id, "UVL"))
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uv_system_type = UV_LEGACY_APIC;
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else if (!strcmp(oem_table_id, "UVX"))
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uv_system_type = UV_X2APIC;
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else if (!strcmp(oem_table_id, "UVH"))
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uv_system_type = UV_NON_UNIQUE_APIC;
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}
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return 0;
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}
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unsigned int read_apic_id(void)
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{
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unsigned int id;
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WARN_ON(preemptible() && num_online_cpus() > 1);
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id = apic_read(APIC_ID);
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if (uv_system_type >= UV_X2APIC)
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id |= __get_cpu_var(x2apic_extra_bits);
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return id;
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}
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enum uv_system_type get_uv_system_type(void)
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{
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return uv_system_type;
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}
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int is_uv_system(void)
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{
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return uv_system_type != UV_NONE;
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}
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