1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2004 James Cleverdon, IBM. 4 * 5 * Flat APIC subarch code. 6 * 7 * Hacked for x86-64 by James Cleverdon from i386 architecture code by 8 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and 9 * James Cleverdon. 10 */ 11 #include <linux/cpumask.h> 12 #include <linux/export.h> 13 #include <linux/acpi.h> 14 15 #include <asm/jailhouse_para.h> 16 #include <asm/apic.h> 17 18 #include "local.h" 19 20 static struct apic apic_physflat; 21 static struct apic apic_flat; 22 23 struct apic *apic __ro_after_init = &apic_flat; 24 EXPORT_SYMBOL_GPL(apic); 25 26 static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 27 { 28 return 1; 29 } 30 31 static void _flat_send_IPI_mask(unsigned long mask, int vector) 32 { 33 unsigned long flags; 34 35 local_irq_save(flags); 36 __default_send_IPI_dest_field(mask, vector, APIC_DEST_LOGICAL); 37 local_irq_restore(flags); 38 } 39 40 static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector) 41 { 42 unsigned long mask = cpumask_bits(cpumask)[0]; 43 44 _flat_send_IPI_mask(mask, vector); 45 } 46 47 static void 48 flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) 49 { 50 unsigned long mask = cpumask_bits(cpumask)[0]; 51 int cpu = smp_processor_id(); 52 53 if (cpu < BITS_PER_LONG) 54 __clear_bit(cpu, &mask); 55 56 _flat_send_IPI_mask(mask, vector); 57 } 58 59 static u32 flat_get_apic_id(u32 x) 60 { 61 return (x >> 24) & 0xFF; 62 } 63 64 static u32 set_apic_id(u32 id) 65 { 66 return (id & 0xFF) << 24; 67 } 68 69 static int flat_probe(void) 70 { 71 return 1; 72 } 73 74 static struct apic apic_flat __ro_after_init = { 75 .name = "flat", 76 .probe = flat_probe, 77 .acpi_madt_oem_check = flat_acpi_madt_oem_check, 78 .apic_id_registered = default_apic_id_registered, 79 80 .dest_mode_logical = true, 81 82 .disable_esr = 0, 83 84 .init_apic_ldr = default_init_apic_ldr, 85 .cpu_present_to_apicid = default_cpu_present_to_apicid, 86 87 .max_apic_id = 0xFE, 88 .get_apic_id = flat_get_apic_id, 89 .set_apic_id = set_apic_id, 90 91 .calc_dest_apicid = apic_flat_calc_apicid, 92 93 .send_IPI = default_send_IPI_single, 94 .send_IPI_mask = flat_send_IPI_mask, 95 .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself, 96 .send_IPI_allbutself = default_send_IPI_allbutself, 97 .send_IPI_all = default_send_IPI_all, 98 .send_IPI_self = default_send_IPI_self, 99 .nmi_to_offline_cpu = true, 100 101 .read = native_apic_mem_read, 102 .write = native_apic_mem_write, 103 .eoi = native_apic_mem_eoi, 104 .icr_read = native_apic_icr_read, 105 .icr_write = native_apic_icr_write, 106 .wait_icr_idle = apic_mem_wait_icr_idle, 107 .safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout, 108 }; 109 110 /* 111 * Physflat mode is used when there are more than 8 CPUs on a system. 112 * We cannot use logical delivery in this case because the mask 113 * overflows, so use physical mode. 114 */ 115 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 116 { 117 #ifdef CONFIG_ACPI 118 /* 119 * Quirk: some x86_64 machines can only use physical APIC mode 120 * regardless of how many processors are present (x86_64 ES7000 121 * is an example). 122 */ 123 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID && 124 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) { 125 printk(KERN_DEBUG "system APIC only can use physical flat"); 126 return 1; 127 } 128 129 if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) { 130 printk(KERN_DEBUG "IBM Summit detected, will use apic physical"); 131 return 1; 132 } 133 #endif 134 135 return 0; 136 } 137 138 static int physflat_probe(void) 139 { 140 return apic == &apic_physflat || num_possible_cpus() > 8 || jailhouse_paravirt(); 141 } 142 143 static struct apic apic_physflat __ro_after_init = { 144 145 .name = "physical flat", 146 .probe = physflat_probe, 147 .acpi_madt_oem_check = physflat_acpi_madt_oem_check, 148 .apic_id_registered = default_apic_id_registered, 149 150 .dest_mode_logical = false, 151 152 .disable_esr = 0, 153 154 .cpu_present_to_apicid = default_cpu_present_to_apicid, 155 156 .max_apic_id = 0xFE, 157 .get_apic_id = flat_get_apic_id, 158 .set_apic_id = set_apic_id, 159 160 .calc_dest_apicid = apic_default_calc_apicid, 161 162 .send_IPI = default_send_IPI_single_phys, 163 .send_IPI_mask = default_send_IPI_mask_sequence_phys, 164 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_phys, 165 .send_IPI_allbutself = default_send_IPI_allbutself, 166 .send_IPI_all = default_send_IPI_all, 167 .send_IPI_self = default_send_IPI_self, 168 .nmi_to_offline_cpu = true, 169 170 .read = native_apic_mem_read, 171 .write = native_apic_mem_write, 172 .eoi = native_apic_mem_eoi, 173 .icr_read = native_apic_icr_read, 174 .icr_write = native_apic_icr_write, 175 .wait_icr_idle = apic_mem_wait_icr_idle, 176 .safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout, 177 }; 178 179 /* 180 * We need to check for physflat first, so this order is important. 181 */ 182 apic_drivers(apic_physflat, apic_flat); 183