248 lines
6.3 KiB
C
248 lines
6.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2004 James Cleverdon, IBM.
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*
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* Flat APIC subarch code.
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*
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* Hacked for x86-64 by James Cleverdon from i386 architecture code by
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* Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
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* James Cleverdon.
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*/
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#include <linux/cpumask.h>
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#include <linux/export.h>
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#include <linux/acpi.h>
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#include <asm/jailhouse_para.h>
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#include <asm/apic.h>
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#include "local.h"
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static struct apic apic_physflat;
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static struct apic apic_flat;
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struct apic *apic __ro_after_init = &apic_flat;
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EXPORT_SYMBOL_GPL(apic);
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static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
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{
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return 1;
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}
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/*
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* Set up the logical destination ID.
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*
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* Intel recommends to set DFR, LDR and TPR before enabling
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* an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
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* document number 292116). So here it goes...
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*/
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void flat_init_apic_ldr(void)
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{
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unsigned long val;
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unsigned long num, id;
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num = smp_processor_id();
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id = 1UL << num;
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apic_write(APIC_DFR, APIC_DFR_FLAT);
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val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
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val |= SET_APIC_LOGICAL_ID(id);
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apic_write(APIC_LDR, val);
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}
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static void _flat_send_IPI_mask(unsigned long mask, int vector)
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{
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unsigned long flags;
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local_irq_save(flags);
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__default_send_IPI_dest_field(mask, vector, APIC_DEST_LOGICAL);
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local_irq_restore(flags);
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}
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static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
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{
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unsigned long mask = cpumask_bits(cpumask)[0];
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_flat_send_IPI_mask(mask, vector);
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}
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static void
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flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
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{
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unsigned long mask = cpumask_bits(cpumask)[0];
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int cpu = smp_processor_id();
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if (cpu < BITS_PER_LONG)
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__clear_bit(cpu, &mask);
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_flat_send_IPI_mask(mask, vector);
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}
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static unsigned int flat_get_apic_id(unsigned long x)
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{
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return (x >> 24) & 0xFF;
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}
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static u32 set_apic_id(unsigned int id)
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{
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return (id & 0xFF) << 24;
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}
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static unsigned int read_xapic_id(void)
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{
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return flat_get_apic_id(apic_read(APIC_ID));
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}
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static int flat_apic_id_registered(void)
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{
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return physid_isset(read_xapic_id(), phys_cpu_present_map);
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}
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static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
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{
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return initial_apic_id >> index_msb;
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}
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static int flat_probe(void)
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{
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return 1;
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}
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static struct apic apic_flat __ro_after_init = {
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.name = "flat",
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.probe = flat_probe,
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.acpi_madt_oem_check = flat_acpi_madt_oem_check,
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.apic_id_valid = default_apic_id_valid,
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.apic_id_registered = flat_apic_id_registered,
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.delivery_mode = APIC_DELIVERY_MODE_FIXED,
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.dest_mode_logical = true,
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.disable_esr = 0,
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.check_apicid_used = NULL,
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.init_apic_ldr = flat_init_apic_ldr,
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.ioapic_phys_id_map = NULL,
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.setup_apic_routing = NULL,
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.cpu_present_to_apicid = default_cpu_present_to_apicid,
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.apicid_to_cpu_present = NULL,
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.check_phys_apicid_present = default_check_phys_apicid_present,
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.phys_pkg_id = flat_phys_pkg_id,
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.get_apic_id = flat_get_apic_id,
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.set_apic_id = set_apic_id,
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.calc_dest_apicid = apic_flat_calc_apicid,
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.send_IPI = default_send_IPI_single,
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.send_IPI_mask = flat_send_IPI_mask,
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.send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself,
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.send_IPI_allbutself = default_send_IPI_allbutself,
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.send_IPI_all = default_send_IPI_all,
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.send_IPI_self = default_send_IPI_self,
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.inquire_remote_apic = default_inquire_remote_apic,
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.read = native_apic_mem_read,
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.write = native_apic_mem_write,
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.eoi_write = native_apic_mem_write,
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.icr_read = native_apic_icr_read,
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.icr_write = native_apic_icr_write,
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.wait_icr_idle = native_apic_wait_icr_idle,
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.safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
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};
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/*
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* Physflat mode is used when there are more than 8 CPUs on a system.
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* We cannot use logical delivery in this case because the mask
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* overflows, so use physical mode.
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*/
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static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
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{
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#ifdef CONFIG_ACPI
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/*
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* Quirk: some x86_64 machines can only use physical APIC mode
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* regardless of how many processors are present (x86_64 ES7000
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* is an example).
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*/
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if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
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(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
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printk(KERN_DEBUG "system APIC only can use physical flat");
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return 1;
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}
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if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
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printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
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return 1;
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}
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#endif
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return 0;
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}
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static void physflat_init_apic_ldr(void)
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{
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/*
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* LDR and DFR are not involved in physflat mode, rather:
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* "In physical destination mode, the destination processor is
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* specified by its local APIC ID [...]." (Intel SDM, 10.6.2.1)
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*/
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}
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static int physflat_probe(void)
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{
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if (apic == &apic_physflat || num_possible_cpus() > 8 ||
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jailhouse_paravirt())
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return 1;
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return 0;
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}
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static struct apic apic_physflat __ro_after_init = {
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.name = "physical flat",
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.probe = physflat_probe,
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.acpi_madt_oem_check = physflat_acpi_madt_oem_check,
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.apic_id_valid = default_apic_id_valid,
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.apic_id_registered = flat_apic_id_registered,
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.delivery_mode = APIC_DELIVERY_MODE_FIXED,
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.dest_mode_logical = false,
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.disable_esr = 0,
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.check_apicid_used = NULL,
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.init_apic_ldr = physflat_init_apic_ldr,
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.ioapic_phys_id_map = NULL,
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.setup_apic_routing = NULL,
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.cpu_present_to_apicid = default_cpu_present_to_apicid,
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.apicid_to_cpu_present = NULL,
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.check_phys_apicid_present = default_check_phys_apicid_present,
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.phys_pkg_id = flat_phys_pkg_id,
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.get_apic_id = flat_get_apic_id,
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.set_apic_id = set_apic_id,
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.calc_dest_apicid = apic_default_calc_apicid,
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.send_IPI = default_send_IPI_single_phys,
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.send_IPI_mask = default_send_IPI_mask_sequence_phys,
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.send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_phys,
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.send_IPI_allbutself = default_send_IPI_allbutself,
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.send_IPI_all = default_send_IPI_all,
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.send_IPI_self = default_send_IPI_self,
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.inquire_remote_apic = default_inquire_remote_apic,
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.read = native_apic_mem_read,
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.write = native_apic_mem_write,
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.eoi_write = native_apic_mem_write,
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.icr_read = native_apic_icr_read,
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.icr_write = native_apic_icr_write,
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.wait_icr_idle = native_apic_wait_icr_idle,
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.safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
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};
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/*
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* We need to check for physflat first, so this order is important.
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*/
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apic_drivers(apic_physflat, apic_flat);
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