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209 lines
4.9 KiB
209 lines
4.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Default generic APIC driver. This handles up to 8 CPUs. |
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* |
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* Copyright 2003 Andi Kleen, SuSE Labs. |
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* |
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* Generic x86 APIC driver probe layer. |
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*/ |
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#include <linux/export.h> |
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#include <linux/errno.h> |
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#include <linux/smp.h> |
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#include <asm/io_apic.h> |
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#include <asm/apic.h> |
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#include <asm/acpi.h> |
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#include "local.h" |
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static int default_x86_32_early_logical_apicid(int cpu) |
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{ |
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return 1 << cpu; |
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} |
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static void setup_apic_flat_routing(void) |
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{ |
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#ifdef CONFIG_X86_IO_APIC |
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printk(KERN_INFO |
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"Enabling APIC mode: Flat. Using %d I/O APICs\n", |
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nr_ioapics); |
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#endif |
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} |
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static int default_apic_id_registered(void) |
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{ |
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return physid_isset(read_apic_id(), phys_cpu_present_map); |
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} |
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/* |
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* Set up the logical destination ID. Intel recommends to set DFR, LDR and |
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* TPR before enabling an APIC. See e.g. "AP-388 82489DX User's Manual" |
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* (Intel document number 292116). |
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*/ |
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static void default_init_apic_ldr(void) |
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{ |
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unsigned long val; |
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apic_write(APIC_DFR, APIC_DFR_VALUE); |
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val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; |
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val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id()); |
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apic_write(APIC_LDR, val); |
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} |
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static int default_phys_pkg_id(int cpuid_apic, int index_msb) |
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{ |
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return cpuid_apic >> index_msb; |
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} |
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/* should be called last. */ |
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static int probe_default(void) |
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{ |
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return 1; |
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} |
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static struct apic apic_default __ro_after_init = { |
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.name = "default", |
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.probe = probe_default, |
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.acpi_madt_oem_check = NULL, |
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.apic_id_valid = default_apic_id_valid, |
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.apic_id_registered = default_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 = default_check_apicid_used, |
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.init_apic_ldr = default_init_apic_ldr, |
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.ioapic_phys_id_map = default_ioapic_phys_id_map, |
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.setup_apic_routing = setup_apic_flat_routing, |
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.cpu_present_to_apicid = default_cpu_present_to_apicid, |
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.apicid_to_cpu_present = physid_set_mask_of_physid, |
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.check_phys_apicid_present = default_check_phys_apicid_present, |
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.phys_pkg_id = default_phys_pkg_id, |
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.get_apic_id = default_get_apic_id, |
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.set_apic_id = NULL, |
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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 = default_send_IPI_mask_logical, |
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.send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_logical, |
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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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.x86_32_early_logical_apicid = default_x86_32_early_logical_apicid, |
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}; |
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apic_driver(apic_default); |
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struct apic *apic __ro_after_init = &apic_default; |
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EXPORT_SYMBOL_GPL(apic); |
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static int cmdline_apic __initdata; |
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static int __init parse_apic(char *arg) |
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{ |
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struct apic **drv; |
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if (!arg) |
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return -EINVAL; |
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for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { |
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if (!strcmp((*drv)->name, arg)) { |
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apic = *drv; |
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cmdline_apic = 1; |
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return 0; |
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} |
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} |
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/* Parsed again by __setup for debug/verbose */ |
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return 0; |
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} |
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early_param("apic", parse_apic); |
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void __init default_setup_apic_routing(void) |
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{ |
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int version = boot_cpu_apic_version; |
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if (num_possible_cpus() > 8) { |
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switch (boot_cpu_data.x86_vendor) { |
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case X86_VENDOR_INTEL: |
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if (!APIC_XAPIC(version)) { |
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def_to_bigsmp = 0; |
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break; |
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} |
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/* P4 and above */ |
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fallthrough; |
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case X86_VENDOR_HYGON: |
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case X86_VENDOR_AMD: |
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def_to_bigsmp = 1; |
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} |
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} |
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#ifdef CONFIG_X86_BIGSMP |
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/* |
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* This is used to switch to bigsmp mode when |
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* - There is no apic= option specified by the user |
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* - generic_apic_probe() has chosen apic_default as the sub_arch |
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* - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support |
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*/ |
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if (!cmdline_apic && apic == &apic_default) |
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generic_bigsmp_probe(); |
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#endif |
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if (apic->setup_apic_routing) |
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apic->setup_apic_routing(); |
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} |
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void __init generic_apic_probe(void) |
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{ |
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if (!cmdline_apic) { |
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struct apic **drv; |
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for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { |
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if ((*drv)->probe()) { |
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apic = *drv; |
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break; |
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} |
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} |
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/* Not visible without early console */ |
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if (drv == __apicdrivers_end) |
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panic("Didn't find an APIC driver"); |
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} |
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printk(KERN_INFO "Using APIC driver %s\n", apic->name); |
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} |
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/* This function can switch the APIC even after the initial ->probe() */ |
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int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id) |
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{ |
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struct apic **drv; |
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for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { |
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if (!(*drv)->acpi_madt_oem_check) |
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continue; |
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if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id)) |
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continue; |
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if (!cmdline_apic) { |
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apic = *drv; |
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printk(KERN_INFO "Switched to APIC driver `%s'.\n", |
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apic->name); |
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} |
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return 1; |
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} |
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return 0; |
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}
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