90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
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/*
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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/config.h>
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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/kernel.h>
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#include <linux/ctype.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <asm/smp.h>
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#include <asm/ipi.h>
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/* which logical CPU number maps to which CPU (physical APIC ID) */
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u8 x86_cpu_to_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
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EXPORT_SYMBOL(x86_cpu_to_apicid);
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u8 x86_cpu_to_log_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
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extern struct genapic apic_cluster;
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extern struct genapic apic_flat;
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struct genapic *genapic = &apic_flat;
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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 clustered_apic_check(void)
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{
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long i;
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u8 clusters, max_cluster;
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u8 id;
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u8 cluster_cnt[NUM_APIC_CLUSTERS];
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if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
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/* AMD always uses flat mode right now */
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genapic = &apic_flat;
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goto print;
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}
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memset(cluster_cnt, 0, sizeof(cluster_cnt));
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for (i = 0; i < NR_CPUS; i++) {
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id = bios_cpu_apicid[i];
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if (id != BAD_APICID)
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cluster_cnt[APIC_CLUSTERID(id)]++;
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}
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clusters = 0;
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max_cluster = 0;
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for (i = 0; i < NUM_APIC_CLUSTERS; i++) {
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if (cluster_cnt[i] > 0) {
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++clusters;
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if (cluster_cnt[i] > max_cluster)
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max_cluster = cluster_cnt[i];
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}
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}
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/*
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* If we have clusters <= 1 and CPUs <= 8 in cluster 0, then flat mode,
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* else if max_cluster <= 4 and cluster_cnt[15] == 0, clustered logical
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* else physical mode.
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* (We don't use lowest priority delivery + HW APIC IRQ steering, so
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* can ignore the clustered logical case and go straight to physical.)
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*/
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if (clusters <= 1 && max_cluster <= 8 && cluster_cnt[0] == max_cluster)
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genapic = &apic_flat;
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else
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genapic = &apic_cluster;
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print:
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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 clustered. */
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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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