17e300dabSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
22a05180fSIngo Molnar /*
32a05180fSIngo Molnar * Default generic APIC driver. This handles up to 8 CPUs.
42a05180fSIngo Molnar *
52a05180fSIngo Molnar * Copyright 2003 Andi Kleen, SuSE Labs.
62a05180fSIngo Molnar *
72a05180fSIngo Molnar * Generic x86 APIC driver probe layer.
82a05180fSIngo Molnar */
9186f4360SPaul Gortmaker #include <linux/export.h>
102a05180fSIngo Molnar #include <linux/errno.h>
112a05180fSIngo Molnar #include <linux/smp.h>
122a05180fSIngo Molnar
1379c9a17cSThomas Gleixner #include <xen/xen.h>
1479c9a17cSThomas Gleixner
1513c01139SIngo Molnar #include <asm/io_apic.h>
162a05180fSIngo Molnar #include <asm/apic.h>
172a05180fSIngo Molnar #include <asm/acpi.h>
182a05180fSIngo Molnar
19c94f0718SThomas Gleixner #include "local.h"
202a05180fSIngo Molnar
default_phys_pkg_id(int cpuid_apic,int index_msb)210801bbaaSThomas Gleixner static int default_phys_pkg_id(int cpuid_apic, int index_msb)
220801bbaaSThomas Gleixner {
230801bbaaSThomas Gleixner return cpuid_apic >> index_msb;
240801bbaaSThomas Gleixner }
250801bbaaSThomas Gleixner
262a05180fSIngo Molnar /* should be called last. */
probe_default(void)272a05180fSIngo Molnar static int probe_default(void)
282a05180fSIngo Molnar {
292a05180fSIngo Molnar return 1;
302a05180fSIngo Molnar }
312a05180fSIngo Molnar
32404f6aacSKees Cook static struct apic apic_default __ro_after_init = {
332a05180fSIngo Molnar
342a05180fSIngo Molnar .name = "default",
352a05180fSIngo Molnar .probe = probe_default,
362a05180fSIngo Molnar .apic_id_registered = default_apic_id_registered,
372a05180fSIngo Molnar
3872161299SThomas Gleixner .delivery_mode = APIC_DELIVERY_MODE_FIXED,
398c44963bSThomas Gleixner .dest_mode_logical = true,
402a05180fSIngo Molnar
412a05180fSIngo Molnar .disable_esr = 0,
42e57d04e5SThomas Gleixner
432a05180fSIngo Molnar .check_apicid_used = default_check_apicid_used,
442a05180fSIngo Molnar .init_apic_ldr = default_init_apic_ldr,
452a05180fSIngo Molnar .ioapic_phys_id_map = default_ioapic_phys_id_map,
462a05180fSIngo Molnar .cpu_present_to_apicid = default_cpu_present_to_apicid,
472a05180fSIngo Molnar .phys_pkg_id = default_phys_pkg_id,
482a05180fSIngo Molnar
49d92e5e7cSThomas Gleixner .max_apic_id = 0xFE,
502a05180fSIngo Molnar .get_apic_id = default_get_apic_id,
512a05180fSIngo Molnar
529f9e3bb1SThomas Gleixner .calc_dest_apicid = apic_flat_calc_apicid,
532a05180fSIngo Molnar
546153058aSThomas Gleixner .send_IPI = default_send_IPI_single,
552a05180fSIngo Molnar .send_IPI_mask = default_send_IPI_mask_logical,
562a05180fSIngo Molnar .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_logical,
572a05180fSIngo Molnar .send_IPI_allbutself = default_send_IPI_allbutself,
582a05180fSIngo Molnar .send_IPI_all = default_send_IPI_all,
592a05180fSIngo Molnar .send_IPI_self = default_send_IPI_self,
602a05180fSIngo Molnar
612a05180fSIngo Molnar .read = native_apic_mem_read,
622a05180fSIngo Molnar .write = native_apic_mem_write,
63185c8f33SThomas Gleixner .eoi = native_apic_mem_eoi,
642a05180fSIngo Molnar .icr_read = native_apic_icr_read,
652a05180fSIngo Molnar .icr_write = native_apic_icr_write,
66cfebd007SThomas Gleixner .wait_icr_idle = apic_mem_wait_icr_idle,
67e7b6a023SThomas Gleixner .safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout,
682a05180fSIngo Molnar };
692a05180fSIngo Molnar
70107e0e0cSSuresh Siddha apic_driver(apic_default);
71107e0e0cSSuresh Siddha
72404f6aacSKees Cook struct apic *apic __ro_after_init = &apic_default;
732a05180fSIngo Molnar EXPORT_SYMBOL_GPL(apic);
742a05180fSIngo Molnar
752a05180fSIngo Molnar static int cmdline_apic __initdata;
parse_apic(char * arg)762a05180fSIngo Molnar static int __init parse_apic(char *arg)
772a05180fSIngo Molnar {
788b37e880SSuresh Siddha struct apic **drv;
792a05180fSIngo Molnar
802a05180fSIngo Molnar if (!arg)
812a05180fSIngo Molnar return -EINVAL;
822a05180fSIngo Molnar
838b37e880SSuresh Siddha for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
848b37e880SSuresh Siddha if (!strcmp((*drv)->name, arg)) {
85*3af1e415SThomas Gleixner apic_install_driver(*drv);
862a05180fSIngo Molnar cmdline_apic = 1;
872a05180fSIngo Molnar return 0;
882a05180fSIngo Molnar }
892a05180fSIngo Molnar }
902a05180fSIngo Molnar
912a05180fSIngo Molnar /* Parsed again by __setup for debug/verbose */
922a05180fSIngo Molnar return 0;
932a05180fSIngo Molnar }
942a05180fSIngo Molnar early_param("apic", parse_apic);
952a05180fSIngo Molnar
x86_32_probe_bigsmp_early(void)9679c9a17cSThomas Gleixner void __init x86_32_probe_bigsmp_early(void)
972a05180fSIngo Molnar {
9879c9a17cSThomas Gleixner if (nr_cpu_ids <= 8 || xen_pv_domain())
9979c9a17cSThomas Gleixner return;
10069c252ffSSuresh Siddha
10179c9a17cSThomas Gleixner if (IS_ENABLED(CONFIG_X86_BIGSMP)) {
10269c252ffSSuresh Siddha switch (boot_cpu_data.x86_vendor) {
10369c252ffSSuresh Siddha case X86_VENDOR_INTEL:
10479c9a17cSThomas Gleixner if (!APIC_XAPIC(boot_cpu_apic_version))
10569c252ffSSuresh Siddha break;
1065785675dSBorislav Petkov /* P4 and above */
107df561f66SGustavo A. R. Silva fallthrough;
108da33dfefSPu Wen case X86_VENDOR_HYGON:
10969c252ffSSuresh Siddha case X86_VENDOR_AMD:
11079c9a17cSThomas Gleixner if (apic_bigsmp_possible(cmdline_apic))
11179c9a17cSThomas Gleixner return;
11279c9a17cSThomas Gleixner break;
11369c252ffSSuresh Siddha }
11469c252ffSSuresh Siddha }
11579c9a17cSThomas Gleixner pr_info("Limiting to 8 possible CPUs\n");
11679c9a17cSThomas Gleixner set_nr_cpu_ids(8);
11779c9a17cSThomas Gleixner }
11869c252ffSSuresh Siddha
x86_32_install_bigsmp(void)1199d87f5b6SThomas Gleixner void __init x86_32_install_bigsmp(void)
12079c9a17cSThomas Gleixner {
12179c9a17cSThomas Gleixner if (nr_cpu_ids > 8 && !xen_pv_domain())
12279c9a17cSThomas Gleixner apic_bigsmp_force();
1232a05180fSIngo Molnar }
1242a05180fSIngo Molnar
x86_32_probe_apic(void)1259d87f5b6SThomas Gleixner void __init x86_32_probe_apic(void)
1262a05180fSIngo Molnar {
1272a05180fSIngo Molnar if (!cmdline_apic) {
1288b37e880SSuresh Siddha struct apic **drv;
1298b37e880SSuresh Siddha
1308b37e880SSuresh Siddha for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
1318b37e880SSuresh Siddha if ((*drv)->probe()) {
132*3af1e415SThomas Gleixner apic_install_driver(*drv);
1332a05180fSIngo Molnar break;
1342a05180fSIngo Molnar }
1352a05180fSIngo Molnar }
1362a05180fSIngo Molnar /* Not visible without early console */
1378b37e880SSuresh Siddha if (drv == __apicdrivers_end)
1382a05180fSIngo Molnar panic("Didn't find an APIC driver");
1392a05180fSIngo Molnar }
1402a05180fSIngo Molnar }
141