// 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 unsigned bigsmp_get_apic_id(unsigned long x) { return (x >> 24) & 0xFF; } static int bigsmp_apic_id_registered(void) { return 1; } static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid) { return false; } static int bigsmp_early_logical_apicid(int cpu) { /* on bigsmp, logical apicid is the same as physical */ return early_per_cpu(x86_cpu_to_apicid, cpu); } /* * bigsmp enables physical destination mode * and doesn't use LDR and DFR */ static void bigsmp_init_apic_ldr(void) { } static void bigsmp_setup_apic_routing(void) { printk(KERN_INFO "Enabling APIC mode: Physflat. Using %d I/O APICs\n", nr_ioapics); } static int bigsmp_cpu_present_to_apicid(int mps_cpu) { if (mps_cpu < nr_cpu_ids) return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu); return BAD_APICID; } static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap) { /* For clustered we don't have a good way to do this yet - hack */ physids_promote(0xFFL, retmap); } static int bigsmp_check_phys_apicid_present(int phys_apicid) { return 1; } static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb) { return cpuid_apic >> index_msb; } 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) { if (def_to_bigsmp) dmi_bigsmp = 1; else dmi_check_system(bigsmp_dmi_table); return dmi_bigsmp; } static struct apic apic_bigsmp __ro_after_init = { .name = "bigsmp", .probe = probe_bigsmp, .acpi_madt_oem_check = NULL, .apic_id_valid = default_apic_id_valid, .apic_id_registered = bigsmp_apic_id_registered, .delivery_mode = APIC_DELIVERY_MODE_FIXED, .dest_mode_logical = false, .disable_esr = 1, .check_apicid_used = bigsmp_check_apicid_used, .init_apic_ldr = bigsmp_init_apic_ldr, .ioapic_phys_id_map = bigsmp_ioapic_phys_id_map, .setup_apic_routing = bigsmp_setup_apic_routing, .cpu_present_to_apicid = bigsmp_cpu_present_to_apicid, .apicid_to_cpu_present = physid_set_mask_of_physid, .check_phys_apicid_present = bigsmp_check_phys_apicid_present, .phys_pkg_id = bigsmp_phys_pkg_id, .get_apic_id = bigsmp_get_apic_id, .set_apic_id = NULL, .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, .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, .x86_32_early_logical_apicid = bigsmp_early_logical_apicid, }; void __init generic_bigsmp_probe(void) { unsigned int cpu; if (!probe_bigsmp()) return; apic = &apic_bigsmp; for_each_possible_cpu(cpu) { if (early_per_cpu(x86_cpu_to_logical_apicid, cpu) == BAD_APICID) continue; early_per_cpu(x86_cpu_to_logical_apicid, cpu) = bigsmp_early_logical_apicid(cpu); } pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name); } apic_driver(apic_bigsmp);