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In preparation for converting the hotpath APIC callbacks to static keys, provide common initialization infrastructure. Lift apic_install_drivers() from probe_64.c and convert all places which switch the apic instance by storing the pointer to use apic_install_driver() as a first step. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Michael Kelley <mikelley@microsoft.com> Tested-by: Sohil Mehta <sohil.mehta@intel.com> Tested-by: Juergen Gross <jgross@suse.com> # Xen PV (dom0 and unpriv. guest)
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#define pr_fmt(fmt) "APIC: " fmt
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#include <asm/apic.h>
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#include "local.h"
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void __init apic_install_driver(struct apic *driver)
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{
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if (apic == driver)
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return;
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apic = driver;
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if (IS_ENABLED(CONFIG_X86_X2APIC) && apic->x2apic_set_max_apicid)
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apic->max_apic_id = x2apic_max_apicid;
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pr_info("Switched APIC routing to: %s\n", driver->name);
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}
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#ifdef CONFIG_X86_64
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void __init acpi_wake_cpu_handler_update(wakeup_cpu_handler handler)
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{
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struct apic **drv;
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for (drv = __apicdrivers; drv < __apicdrivers_end; drv++)
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(*drv)->wakeup_secondary_cpu_64 = handler;
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}
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#endif
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/*
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* Override the generic EOI implementation with an optimized version.
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* Only called during early boot when only one CPU is active and with
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* interrupts disabled, so we know this does not race with actual APIC driver
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* use.
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*/
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void __init apic_set_eoi_cb(void (*eoi)(void))
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{
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struct apic **drv;
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for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
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/* Should happen once for each apic */
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WARN_ON((*drv)->eoi == eoi);
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(*drv)->native_eoi = (*drv)->eoi;
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(*drv)->eoi = eoi;
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}
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}
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