bb668da6d6
We can use logical flat mode if there are <= 8 logical cpu's (irrespective of physical apic id values). This will enable simplified and efficient IPI and device interrupt routing on such platforms. This has been tested to work on both Intel and AMD platforms. Exceptions like IBM summit platform which can't use logical flat mode are addressed by using OEM platform checks. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Chris McDermott <lcm@linux.vnet.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
109 lines
2.3 KiB
C
109 lines
2.3 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 <linux/dmar.h>
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#include <asm/smp.h>
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#include <asm/apic.h>
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#include <asm/ipi.h>
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#include <asm/setup.h>
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extern struct apic apic_flat;
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extern struct apic apic_physflat;
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extern struct apic apic_x2xpic_uv_x;
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extern struct apic apic_x2apic_phys;
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extern struct apic apic_x2apic_cluster;
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struct apic __read_mostly *apic = &apic_flat;
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EXPORT_SYMBOL_GPL(apic);
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static struct apic *apic_probe[] __initdata = {
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#ifdef CONFIG_X86_UV
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&apic_x2apic_uv_x,
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#endif
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#ifdef CONFIG_X86_X2APIC
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&apic_x2apic_phys,
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&apic_x2apic_cluster,
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#endif
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&apic_physflat,
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NULL,
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};
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static int apicid_phys_pkg_id(int initial_apic_id, int index_msb)
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{
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return hard_smp_processor_id() >> index_msb;
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}
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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 default_setup_apic_routing(void)
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{
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#ifdef CONFIG_X86_X2APIC
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if (x2apic_mode
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#ifdef CONFIG_X86_UV
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&& apic != &apic_x2apic_uv_x
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#endif
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) {
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if (x2apic_phys)
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apic = &apic_x2apic_phys;
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else
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apic = &apic_x2apic_cluster;
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}
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#endif
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if (apic == &apic_flat && num_processors > 8)
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apic = &apic_physflat;
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printk(KERN_INFO "Setting APIC routing to %s\n", apic->name);
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if (is_vsmp_box()) {
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/* need to update phys_pkg_id */
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apic->phys_pkg_id = apicid_phys_pkg_id;
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}
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/*
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* Now that apic routing model is selected, configure the
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* fault handling for intr remapping.
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*/
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if (intr_remapping_enabled)
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enable_drhd_fault_handling();
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}
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/* Same for both flat and physical. */
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void apic_send_IPI_self(int vector)
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{
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__default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
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}
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int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
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{
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int i;
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for (i = 0; apic_probe[i]; ++i) {
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if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
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apic = apic_probe[i];
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printk(KERN_INFO "Setting APIC routing to %s.\n",
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apic->name);
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return 1;
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}
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}
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return 0;
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}
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