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// SPDX-License-Identifier: GPL-2.0-only
/*
* Default generic APIC driver. This handles up to 8 CPUs.
*
* Copyright 2003 Andi Kleen, SuSE Labs.
*
* Generic x86 APIC driver probe layer.
*/
#include <linux/export.h>
#include <linux/errno.h>
#include <linux/smp.h>
#include <xen/xen.h>
#include <asm/io_apic.h>
#include <asm/apic.h>
#include <asm/acpi.h>
#include "local.h"
static void setup_apic_flat_routing(void)
{
#ifdef CONFIG_X86_IO_APIC
printk(KERN_INFO
"Enabling APIC mode: Flat. Using %d I/O APICs\n",
nr_ioapics);
#endif
}
static int default_apic_id_registered(void)
{
return physid_isset(read_apic_id(), phys_cpu_present_map);
}
/*
* Set up the logical destination ID. Intel recommends to set DFR, LDR and
* TPR before enabling an APIC. See e.g. "AP-388 82489DX User's Manual"
* (Intel document number 292116).
*/
static void default_init_apic_ldr(void)
{
unsigned long val;
apic_write(APIC_DFR, APIC_DFR_VALUE);
val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
apic_write(APIC_LDR, val);
}
static int default_phys_pkg_id(int cpuid_apic, int index_msb)
{
return cpuid_apic >> index_msb;
}
/* should be called last. */
static int probe_default(void)
{
return 1;
}
static struct apic apic_default __ro_after_init = {
.name = "default",
.probe = probe_default,
.apic_id_valid = default_apic_id_valid,
.apic_id_registered = default_apic_id_registered,
.delivery_mode = APIC_DELIVERY_MODE_FIXED,
.dest_mode_logical = true,
.disable_esr = 0,
.check_apicid_used = default_check_apicid_used,
.init_apic_ldr = default_init_apic_ldr,
.ioapic_phys_id_map = default_ioapic_phys_id_map,
.setup_apic_routing = setup_apic_flat_routing,
.cpu_present_to_apicid = default_cpu_present_to_apicid,
.apicid_to_cpu_present = physid_set_mask_of_physid,
.phys_pkg_id = default_phys_pkg_id,
.get_apic_id = default_get_apic_id,
.set_apic_id = NULL,
.calc_dest_apicid = apic_flat_calc_apicid,
.send_IPI = default_send_IPI_single,
.send_IPI_mask = default_send_IPI_mask_logical,
.send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_logical,
.send_IPI_allbutself = default_send_IPI_allbutself,
.send_IPI_all = default_send_IPI_all,
.send_IPI_self = default_send_IPI_self,
.read = native_apic_mem_read,
.write = native_apic_mem_write,
.eoi_write = native_apic_mem_write,
.icr_read = native_apic_icr_read,
.icr_write = native_apic_icr_write,
.wait_icr_idle = native_apic_wait_icr_idle,
.safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
};
apic_driver(apic_default);
struct apic *apic __ro_after_init = &apic_default;
EXPORT_SYMBOL_GPL(apic);
static int cmdline_apic __initdata;
static int __init parse_apic(char *arg)
{
struct apic **drv;
if (!arg)
return -EINVAL;
for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
if (!strcmp((*drv)->name, arg)) {
apic = *drv;
cmdline_apic = 1;
return 0;
}
}
/* Parsed again by __setup for debug/verbose */
return 0;
}
early_param("apic", parse_apic);
void __init x86_32_probe_bigsmp_early(void)
{
if (nr_cpu_ids <= 8 || xen_pv_domain())
return;
if (IS_ENABLED(CONFIG_X86_BIGSMP)) {
switch (boot_cpu_data.x86_vendor) {
case X86_VENDOR_INTEL:
if (!APIC_XAPIC(boot_cpu_apic_version))
break;
/* P4 and above */
fallthrough;
case X86_VENDOR_HYGON:
case X86_VENDOR_AMD:
if (apic_bigsmp_possible(cmdline_apic))
return;
break;
}
}
pr_info("Limiting to 8 possible CPUs\n");
set_nr_cpu_ids(8);
}
void __init default_setup_apic_routing(void)
{
if (nr_cpu_ids > 8 && !xen_pv_domain())
apic_bigsmp_force();
if (apic->setup_apic_routing)
apic->setup_apic_routing();
}
void __init generic_apic_probe(void)
{
if (!cmdline_apic) {
struct apic **drv;
for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
if ((*drv)->probe()) {
apic = *drv;
break;
}
}
/* Not visible without early console */
if (drv == __apicdrivers_end)
panic("Didn't find an APIC driver");
}
printk(KERN_INFO "Using APIC driver %s\n", apic->name);
}
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