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 u32 flat_phys_pkg_id(u32 initial_apic_id, int index_msb) 70 { 71 return initial_apic_id >> index_msb; 72 } 73 74 static int flat_probe(void) 75 { 76 return 1; 77 } 78 79 static struct apic apic_flat __ro_after_init = { 80 .name = "flat", 81 .probe = flat_probe, 82 .acpi_madt_oem_check = flat_acpi_madt_oem_check, 83 .apic_id_registered = default_apic_id_registered, 84 85 .delivery_mode = APIC_DELIVERY_MODE_FIXED, 86 .dest_mode_logical = true, 87 88 .disable_esr = 0, 89 90 .init_apic_ldr = default_init_apic_ldr, 91 .cpu_present_to_apicid = default_cpu_present_to_apicid, 92 .phys_pkg_id = flat_phys_pkg_id, 93 94 .max_apic_id = 0xFE, 95 .get_apic_id = flat_get_apic_id, 96 .set_apic_id = set_apic_id, 97 98 .calc_dest_apicid = apic_flat_calc_apicid, 99 100 .send_IPI = default_send_IPI_single, 101 .send_IPI_mask = flat_send_IPI_mask, 102 .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself, 103 .send_IPI_allbutself = default_send_IPI_allbutself, 104 .send_IPI_all = default_send_IPI_all, 105 .send_IPI_self = default_send_IPI_self, 106 .nmi_to_offline_cpu = true, 107 108 .read = native_apic_mem_read, 109 .write = native_apic_mem_write, 110 .eoi = native_apic_mem_eoi, 111 .icr_read = native_apic_icr_read, 112 .icr_write = native_apic_icr_write, 113 .wait_icr_idle = apic_mem_wait_icr_idle, 114 .safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout, 115 }; 116 117 /* 118 * Physflat mode is used when there are more than 8 CPUs on a system. 119 * We cannot use logical delivery in this case because the mask 120 * overflows, so use physical mode. 121 */ 122 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 123 { 124 #ifdef CONFIG_ACPI 125 /* 126 * Quirk: some x86_64 machines can only use physical APIC mode 127 * regardless of how many processors are present (x86_64 ES7000 128 * is an example). 129 */ 130 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID && 131 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) { 132 printk(KERN_DEBUG "system APIC only can use physical flat"); 133 return 1; 134 } 135 136 if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) { 137 printk(KERN_DEBUG "IBM Summit detected, will use apic physical"); 138 return 1; 139 } 140 #endif 141 142 return 0; 143 } 144 145 static int physflat_probe(void) 146 { 147 return apic == &apic_physflat || num_possible_cpus() > 8 || jailhouse_paravirt(); 148 } 149 150 static struct apic apic_physflat __ro_after_init = { 151 152 .name = "physical flat", 153 .probe = physflat_probe, 154 .acpi_madt_oem_check = physflat_acpi_madt_oem_check, 155 .apic_id_registered = default_apic_id_registered, 156 157 .delivery_mode = APIC_DELIVERY_MODE_FIXED, 158 .dest_mode_logical = false, 159 160 .disable_esr = 0, 161 162 .cpu_present_to_apicid = default_cpu_present_to_apicid, 163 .phys_pkg_id = flat_phys_pkg_id, 164 165 .max_apic_id = 0xFE, 166 .get_apic_id = flat_get_apic_id, 167 .set_apic_id = set_apic_id, 168 169 .calc_dest_apicid = apic_default_calc_apicid, 170 171 .send_IPI = default_send_IPI_single_phys, 172 .send_IPI_mask = default_send_IPI_mask_sequence_phys, 173 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_phys, 174 .send_IPI_allbutself = default_send_IPI_allbutself, 175 .send_IPI_all = default_send_IPI_all, 176 .send_IPI_self = default_send_IPI_self, 177 .nmi_to_offline_cpu = true, 178 179 .read = native_apic_mem_read, 180 .write = native_apic_mem_write, 181 .eoi = native_apic_mem_eoi, 182 .icr_read = native_apic_icr_read, 183 .icr_write = native_apic_icr_write, 184 .wait_icr_idle = apic_mem_wait_icr_idle, 185 .safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout, 186 }; 187 188 /* 189 * We need to check for physflat first, so this order is important. 190 */ 191 apic_drivers(apic_physflat, apic_flat); 192