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// SPDX-License-Identifier: GPL-2.0
/*
* APIC driver for "bigsmp" xAPIC machines with more than 8 virtual CPUs.
*
* Drives the local APIC in "clustered mode".
*/
#include <linux/cpumask.h>
#include <linux/dmi.h>
#include <linux/smp.h>
#include <asm/apic.h>
#include <asm/io_apic.h>
#include "local.h"
static u32 bigsmp_get_apic_id(u32 x)
{
return (x >> 24) & 0xFF;
}
static void bigsmp_send_IPI_allbutself(int vector)
{
default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
}
static void bigsmp_send_IPI_all(int vector)
{
default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
}
static int dmi_bigsmp; /* can be set by dmi scanners */
static int hp_ht_bigsmp(const struct dmi_system_id *d)
{
printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
dmi_bigsmp = 1;
return 0;
}
static const struct dmi_system_id bigsmp_dmi_table[] = {
{ hp_ht_bigsmp, "HP ProLiant DL760 G2",
{ DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
}
},
{ hp_ht_bigsmp, "HP ProLiant DL740",
{ DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
}
},
{ } /* NULL entry stops DMI scanning */
};
static int probe_bigsmp(void)
{
return dmi_check_system(bigsmp_dmi_table);
}
static struct apic apic_bigsmp __ro_after_init = {
.name = "bigsmp",
.probe = probe_bigsmp,
.dest_mode_logical = false,
.disable_esr = 1,
.cpu_present_to_apicid = default_cpu_present_to_apicid,
.max_apic_id = 0xFE,
.get_apic_id = bigsmp_get_apic_id,
.calc_dest_apicid = apic_default_calc_apicid,
.send_IPI = default_send_IPI_single_phys,
.send_IPI_mask = default_send_IPI_mask_sequence_phys,
.send_IPI_mask_allbutself = NULL,
.send_IPI_allbutself = bigsmp_send_IPI_allbutself,
.send_IPI_all = bigsmp_send_IPI_all,
.send_IPI_self = default_send_IPI_self,
.read = native_apic_mem_read,
.write = native_apic_mem_write,
.eoi = native_apic_mem_eoi,
.icr_read = native_apic_icr_read,
.icr_write = native_apic_icr_write,
.wait_icr_idle = apic_mem_wait_icr_idle,
.safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout,
};
bool __init apic_bigsmp_possible(bool cmdline_override)
{
return apic == &apic_bigsmp || !cmdline_override;
}
void __init apic_bigsmp_force(void)
{
if (apic != &apic_bigsmp)
apic_install_driver(&apic_bigsmp);
}
apic_driver(apic_bigsmp);
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