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// SPDX-License-Identifier: GPL-2.0-only
#define pr_fmt(fmt) "APIC: " fmt
#include <asm/apic.h>
#include "local.h"
/*
* Use DEFINE_STATIC_CALL_NULL() to avoid having to provide stub functions
* for each callback. The callbacks are setup during boot and all except
* wait_icr_idle() must be initialized before usage. The IPI wrappers
* use static_call() and not static_call_cond() to catch any fails.
*/
#define DEFINE_APIC_CALL(__cb) \
DEFINE_STATIC_CALL_NULL(apic_call_##__cb, *apic->__cb)
DEFINE_APIC_CALL(eoi);
DEFINE_APIC_CALL(native_eoi);
DEFINE_APIC_CALL(icr_read);
DEFINE_APIC_CALL(icr_write);
DEFINE_APIC_CALL(read);
DEFINE_APIC_CALL(send_IPI);
DEFINE_APIC_CALL(send_IPI_mask);
DEFINE_APIC_CALL(send_IPI_mask_allbutself);
DEFINE_APIC_CALL(send_IPI_allbutself);
DEFINE_APIC_CALL(send_IPI_all);
DEFINE_APIC_CALL(send_IPI_self);
DEFINE_APIC_CALL(wait_icr_idle);
DEFINE_APIC_CALL(wakeup_secondary_cpu);
DEFINE_APIC_CALL(wakeup_secondary_cpu_64);
DEFINE_APIC_CALL(write);
EXPORT_STATIC_CALL_TRAMP_GPL(apic_call_send_IPI_mask);
EXPORT_STATIC_CALL_TRAMP_GPL(apic_call_send_IPI_self);
/* The container for function call overrides */
struct apic_override __x86_apic_override __initdata;
#define apply_override(__cb) \
if (__x86_apic_override.__cb) \
apic->__cb = __x86_apic_override.__cb
static __init void restore_override_callbacks(void)
{
apply_override(eoi);
apply_override(native_eoi);
apply_override(write);
apply_override(read);
apply_override(send_IPI);
apply_override(send_IPI_mask);
apply_override(send_IPI_mask_allbutself);
apply_override(send_IPI_allbutself);
apply_override(send_IPI_all);
apply_override(send_IPI_self);
apply_override(icr_read);
apply_override(icr_write);
apply_override(wakeup_secondary_cpu);
apply_override(wakeup_secondary_cpu_64);
}
#define update_call(__cb) \
static_call_update(apic_call_##__cb, *apic->__cb)
static __init void update_static_calls(void)
{
update_call(eoi);
update_call(native_eoi);
update_call(write);
update_call(read);
update_call(send_IPI);
update_call(send_IPI_mask);
update_call(send_IPI_mask_allbutself);
update_call(send_IPI_allbutself);
update_call(send_IPI_all);
update_call(send_IPI_self);
update_call(icr_read);
update_call(icr_write);
update_call(wait_icr_idle);
update_call(wakeup_secondary_cpu);
update_call(wakeup_secondary_cpu_64);
}
void __init apic_setup_apic_calls(void)
{
/* Ensure that the default APIC has native_eoi populated */
apic->native_eoi = apic->eoi;
update_static_calls();
pr_info("Static calls initialized\n");
}
void __init apic_install_driver(struct apic *driver)
{
if (apic == driver)
return;
apic = driver;
if (IS_ENABLED(CONFIG_X86_X2APIC) && apic->x2apic_set_max_apicid)
apic->max_apic_id = x2apic_max_apicid;
/* Copy the original eoi() callback as KVM/HyperV might overwrite it */
if (!apic->native_eoi)
apic->native_eoi = apic->eoi;
/* Apply any already installed callback overrides */
restore_override_callbacks();
update_static_calls();
pr_info("Switched APIC routing to: %s\n", driver->name);
}
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