1// SPDX-License-Identifier: GPL-2.0 2/* 3 * APIC driver for "bigsmp" xAPIC machines with more than 8 virtual CPUs. 4 * 5 * Drives the local APIC in "clustered mode". 6 */ 7#include <linux/cpumask.h> 8#include <linux/dmi.h> 9#include <linux/smp.h> 10 11#include <asm/apic.h> 12#include <asm/io_apic.h> 13 14#include "local.h" 15 16static u32 bigsmp_get_apic_id(u32 x) 17{ 18 return (x >> 24) & 0xFF; 19} 20 21static void bigsmp_send_IPI_allbutself(int vector) 22{ 23 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 24} 25 26static void bigsmp_send_IPI_all(int vector) 27{ 28 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector); 29} 30 31static int dmi_bigsmp; /* can be set by dmi scanners */ 32 33static int hp_ht_bigsmp(const struct dmi_system_id *d) 34{ 35 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident); 36 dmi_bigsmp = 1; 37 38 return 0; 39} 40 41 42static const struct dmi_system_id bigsmp_dmi_table[] = { 43 { hp_ht_bigsmp, "HP ProLiant DL760 G2", 44 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 45 DMI_MATCH(DMI_BIOS_VERSION, "P44-"), 46 } 47 }, 48 49 { hp_ht_bigsmp, "HP ProLiant DL740", 50 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 51 DMI_MATCH(DMI_BIOS_VERSION, "P47-"), 52 } 53 }, 54 { } /* NULL entry stops DMI scanning */ 55}; 56 57static int probe_bigsmp(void) 58{ 59 return dmi_check_system(bigsmp_dmi_table); 60} 61 62static struct apic apic_bigsmp __ro_after_init = { 63 64 .name = "bigsmp", 65 .probe = probe_bigsmp, 66 67 .dest_mode_logical = false, 68 69 .disable_esr = 1, 70 71 .cpu_present_to_apicid = default_cpu_present_to_apicid, 72 73 .max_apic_id = 0xFE, 74 .get_apic_id = bigsmp_get_apic_id, 75 76 .calc_dest_apicid = apic_default_calc_apicid, 77 78 .send_IPI = default_send_IPI_single_phys, 79 .send_IPI_mask = default_send_IPI_mask_sequence_phys, 80 .send_IPI_mask_allbutself = NULL, 81 .send_IPI_allbutself = bigsmp_send_IPI_allbutself, 82 .send_IPI_all = bigsmp_send_IPI_all, 83 .send_IPI_self = default_send_IPI_self, 84 85 .read = native_apic_mem_read, 86 .write = native_apic_mem_write, 87 .eoi = native_apic_mem_eoi, 88 .icr_read = native_apic_icr_read, 89 .icr_write = native_apic_icr_write, 90 .wait_icr_idle = apic_mem_wait_icr_idle, 91 .safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout, 92}; 93 94bool __init apic_bigsmp_possible(bool cmdline_override) 95{ 96 return apic == &apic_bigsmp || !cmdline_override; 97} 98 99void __init apic_bigsmp_force(void) 100{ 101 if (apic != &apic_bigsmp) 102 apic_install_driver(&apic_bigsmp); 103} 104 105apic_driver(apic_bigsmp); 106