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// SPDX-License-Identifier: GPL-2.0
#include <linux/cpumask.h>
#include <linux/acpi.h>
#include "local.h"
int x2apic_phys;
static struct apic apic_x2apic_phys;
u32 x2apic_max_apicid __ro_after_init = UINT_MAX;
void __init x2apic_set_max_apicid(u32 apicid)
{
x2apic_max_apicid = apicid;
if (apic->x2apic_set_max_apicid)
apic->max_apic_id = apicid;
}
static int __init set_x2apic_phys_mode(char *arg)
{
x2apic_phys = 1;
return 0;
}
early_param("x2apic_phys", set_x2apic_phys_mode);
static bool x2apic_fadt_phys(void)
{
#ifdef CONFIG_ACPI
if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
printk(KERN_DEBUG "System requires x2apic physical mode\n");
return true;
}
#endif
return false;
}
static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys());
}
static void x2apic_send_IPI(int cpu, int vector)
{
u32 dest = per_cpu(x86_cpu_to_apicid, cpu);
/* x2apic MSRs are special and need a special fence: */
weak_wrmsr_fence();
__x2apic_send_IPI_dest(dest, vector, APIC_DEST_PHYSICAL);
}
static void
__x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
{
unsigned long query_cpu;
unsigned long this_cpu;
unsigned long flags;
/* x2apic MSRs are special and need a special fence: */
weak_wrmsr_fence();
local_irq_save(flags);
this_cpu = smp_processor_id();
for_each_cpu(query_cpu, mask) {
if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu)
continue;
__x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
vector, APIC_DEST_PHYSICAL);
}
local_irq_restore(flags);
}
static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
{
__x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
}
static void
x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
{
__x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
}
static void __x2apic_send_IPI_shorthand(int vector, u32 which)
{
unsigned long cfg = __prepare_ICR(which, vector, 0);
/* x2apic MSRs are special and need a special fence: */
weak_wrmsr_fence();
native_x2apic_icr_write(cfg, 0);
}
void x2apic_send_IPI_allbutself(int vector)
{
__x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLBUT);
}
void x2apic_send_IPI_all(int vector)
{
__x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLINC);
}
void x2apic_send_IPI_self(int vector)
{
apic_write(APIC_SELF_IPI, vector);
}
void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest)
{
unsigned long cfg = __prepare_ICR(0, vector, dest);
native_x2apic_icr_write(cfg, apicid);
}
static int x2apic_phys_probe(void)
{
if (!x2apic_mode)
return 0;
if (x2apic_phys || x2apic_fadt_phys())
return 1;
return apic == &apic_x2apic_phys;
}
u32 x2apic_get_apic_id(u32 id)
{
return id;
}
static struct apic apic_x2apic_phys __ro_after_init = {
.name = "physical x2apic",
.probe = x2apic_phys_probe,
.acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
.dest_mode_logical = false,
.disable_esr = 0,
.cpu_present_to_apicid = default_cpu_present_to_apicid,
.max_apic_id = UINT_MAX,
.x2apic_set_max_apicid = true,
.get_apic_id = x2apic_get_apic_id,
.calc_dest_apicid = apic_default_calc_apicid,
.send_IPI = x2apic_send_IPI,
.send_IPI_mask = x2apic_send_IPI_mask,
.send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself,
.send_IPI_allbutself = x2apic_send_IPI_allbutself,
.send_IPI_all = x2apic_send_IPI_all,
.send_IPI_self = x2apic_send_IPI_self,
.nmi_to_offline_cpu = true,
.read = native_apic_msr_read,
.write = native_apic_msr_write,
.eoi = native_apic_msr_eoi,
.icr_read = native_x2apic_icr_read,
.icr_write = native_x2apic_icr_write,
};
apic_driver(apic_x2apic_phys);
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