252 lines
6.3 KiB
C
252 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright 2004 James Cleverdon, IBM.
|
|
*
|
|
* Flat APIC subarch code.
|
|
*
|
|
* Hacked for x86-64 by James Cleverdon from i386 architecture code by
|
|
* Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
|
|
* James Cleverdon.
|
|
*/
|
|
#include <linux/cpumask.h>
|
|
#include <linux/export.h>
|
|
#include <linux/acpi.h>
|
|
|
|
#include <asm/jailhouse_para.h>
|
|
#include <asm/apic.h>
|
|
|
|
#include "local.h"
|
|
|
|
static struct apic apic_physflat;
|
|
static struct apic apic_flat;
|
|
|
|
struct apic *apic __ro_after_init = &apic_flat;
|
|
EXPORT_SYMBOL_GPL(apic);
|
|
|
|
static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* 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). So here it goes...
|
|
*/
|
|
void flat_init_apic_ldr(void)
|
|
{
|
|
unsigned long val;
|
|
unsigned long num, id;
|
|
|
|
num = smp_processor_id();
|
|
id = 1UL << num;
|
|
apic_write(APIC_DFR, APIC_DFR_FLAT);
|
|
val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
|
|
val |= SET_APIC_LOGICAL_ID(id);
|
|
apic_write(APIC_LDR, val);
|
|
}
|
|
|
|
static void _flat_send_IPI_mask(unsigned long mask, int vector)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
__default_send_IPI_dest_field(mask, vector, apic->dest_logical);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
|
|
{
|
|
unsigned long mask = cpumask_bits(cpumask)[0];
|
|
|
|
_flat_send_IPI_mask(mask, vector);
|
|
}
|
|
|
|
static void
|
|
flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
|
|
{
|
|
unsigned long mask = cpumask_bits(cpumask)[0];
|
|
int cpu = smp_processor_id();
|
|
|
|
if (cpu < BITS_PER_LONG)
|
|
__clear_bit(cpu, &mask);
|
|
|
|
_flat_send_IPI_mask(mask, vector);
|
|
}
|
|
|
|
static unsigned int flat_get_apic_id(unsigned long x)
|
|
{
|
|
return (x >> 24) & 0xFF;
|
|
}
|
|
|
|
static u32 set_apic_id(unsigned int id)
|
|
{
|
|
return (id & 0xFF) << 24;
|
|
}
|
|
|
|
static unsigned int read_xapic_id(void)
|
|
{
|
|
return flat_get_apic_id(apic_read(APIC_ID));
|
|
}
|
|
|
|
static int flat_apic_id_registered(void)
|
|
{
|
|
return physid_isset(read_xapic_id(), phys_cpu_present_map);
|
|
}
|
|
|
|
static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
|
|
{
|
|
return initial_apic_id >> index_msb;
|
|
}
|
|
|
|
static int flat_probe(void)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static struct apic apic_flat __ro_after_init = {
|
|
.name = "flat",
|
|
.probe = flat_probe,
|
|
.acpi_madt_oem_check = flat_acpi_madt_oem_check,
|
|
.apic_id_valid = default_apic_id_valid,
|
|
.apic_id_registered = flat_apic_id_registered,
|
|
|
|
.irq_delivery_mode = dest_Fixed,
|
|
.irq_dest_mode = 1, /* logical */
|
|
|
|
.disable_esr = 0,
|
|
.dest_logical = APIC_DEST_LOGICAL,
|
|
.check_apicid_used = NULL,
|
|
|
|
.init_apic_ldr = flat_init_apic_ldr,
|
|
|
|
.ioapic_phys_id_map = NULL,
|
|
.setup_apic_routing = NULL,
|
|
.cpu_present_to_apicid = default_cpu_present_to_apicid,
|
|
.apicid_to_cpu_present = NULL,
|
|
.check_phys_apicid_present = default_check_phys_apicid_present,
|
|
.phys_pkg_id = flat_phys_pkg_id,
|
|
|
|
.get_apic_id = flat_get_apic_id,
|
|
.set_apic_id = set_apic_id,
|
|
|
|
.calc_dest_apicid = apic_flat_calc_apicid,
|
|
|
|
.send_IPI = default_send_IPI_single,
|
|
.send_IPI_mask = flat_send_IPI_mask,
|
|
.send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself,
|
|
.send_IPI_allbutself = default_send_IPI_allbutself,
|
|
.send_IPI_all = default_send_IPI_all,
|
|
.send_IPI_self = default_send_IPI_self,
|
|
|
|
.inquire_remote_apic = default_inquire_remote_apic,
|
|
|
|
.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,
|
|
};
|
|
|
|
/*
|
|
* Physflat mode is used when there are more than 8 CPUs on a system.
|
|
* We cannot use logical delivery in this case because the mask
|
|
* overflows, so use physical mode.
|
|
*/
|
|
static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
|
|
{
|
|
#ifdef CONFIG_ACPI
|
|
/*
|
|
* Quirk: some x86_64 machines can only use physical APIC mode
|
|
* regardless of how many processors are present (x86_64 ES7000
|
|
* is an example).
|
|
*/
|
|
if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
|
|
(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
|
|
printk(KERN_DEBUG "system APIC only can use physical flat");
|
|
return 1;
|
|
}
|
|
|
|
if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
|
|
printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void physflat_init_apic_ldr(void)
|
|
{
|
|
/*
|
|
* LDR and DFR are not involved in physflat mode, rather:
|
|
* "In physical destination mode, the destination processor is
|
|
* specified by its local APIC ID [...]." (Intel SDM, 10.6.2.1)
|
|
*/
|
|
}
|
|
|
|
static int physflat_probe(void)
|
|
{
|
|
if (apic == &apic_physflat || num_possible_cpus() > 8 ||
|
|
jailhouse_paravirt())
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct apic apic_physflat __ro_after_init = {
|
|
|
|
.name = "physical flat",
|
|
.probe = physflat_probe,
|
|
.acpi_madt_oem_check = physflat_acpi_madt_oem_check,
|
|
.apic_id_valid = default_apic_id_valid,
|
|
.apic_id_registered = flat_apic_id_registered,
|
|
|
|
.irq_delivery_mode = dest_Fixed,
|
|
.irq_dest_mode = 0, /* physical */
|
|
|
|
.disable_esr = 0,
|
|
.dest_logical = 0,
|
|
.check_apicid_used = NULL,
|
|
|
|
.init_apic_ldr = physflat_init_apic_ldr,
|
|
|
|
.ioapic_phys_id_map = NULL,
|
|
.setup_apic_routing = NULL,
|
|
.cpu_present_to_apicid = default_cpu_present_to_apicid,
|
|
.apicid_to_cpu_present = NULL,
|
|
.check_phys_apicid_present = default_check_phys_apicid_present,
|
|
.phys_pkg_id = flat_phys_pkg_id,
|
|
|
|
.get_apic_id = flat_get_apic_id,
|
|
.set_apic_id = set_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 = default_send_IPI_mask_allbutself_phys,
|
|
.send_IPI_allbutself = default_send_IPI_allbutself,
|
|
.send_IPI_all = default_send_IPI_all,
|
|
.send_IPI_self = default_send_IPI_self,
|
|
|
|
.inquire_remote_apic = default_inquire_remote_apic,
|
|
|
|
.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,
|
|
};
|
|
|
|
/*
|
|
* We need to check for physflat first, so this order is important.
|
|
*/
|
|
apic_drivers(apic_physflat, apic_flat);
|