1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <linux/cpumask.h> 4 #include <linux/acpi.h> 5 6 #include "local.h" 7 8 int x2apic_phys; 9 10 static struct apic apic_x2apic_phys; 11 static u32 x2apic_max_apicid __ro_after_init; 12 13 void __init x2apic_set_max_apicid(u32 apicid) 14 { 15 x2apic_max_apicid = apicid; 16 } 17 18 static int __init set_x2apic_phys_mode(char *arg) 19 { 20 x2apic_phys = 1; 21 return 0; 22 } 23 early_param("x2apic_phys", set_x2apic_phys_mode); 24 25 static bool x2apic_fadt_phys(void) 26 { 27 #ifdef CONFIG_ACPI 28 if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) && 29 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) { 30 printk(KERN_DEBUG "System requires x2apic physical mode\n"); 31 return true; 32 } 33 #endif 34 return false; 35 } 36 37 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 38 { 39 return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys()); 40 } 41 42 static void x2apic_send_IPI(int cpu, int vector) 43 { 44 u32 dest = per_cpu(x86_cpu_to_apicid, cpu); 45 46 x2apic_wrmsr_fence(); 47 __x2apic_send_IPI_dest(dest, vector, APIC_DEST_PHYSICAL); 48 } 49 50 static void 51 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest) 52 { 53 unsigned long query_cpu; 54 unsigned long this_cpu; 55 unsigned long flags; 56 57 x2apic_wrmsr_fence(); 58 59 local_irq_save(flags); 60 61 this_cpu = smp_processor_id(); 62 for_each_cpu(query_cpu, mask) { 63 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu) 64 continue; 65 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu), 66 vector, APIC_DEST_PHYSICAL); 67 } 68 local_irq_restore(flags); 69 } 70 71 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector) 72 { 73 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC); 74 } 75 76 static void 77 x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector) 78 { 79 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT); 80 } 81 82 static void x2apic_send_IPI_allbutself(int vector) 83 { 84 __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLBUT); 85 } 86 87 static void x2apic_send_IPI_all(int vector) 88 { 89 __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLINC); 90 } 91 92 static void init_x2apic_ldr(void) 93 { 94 } 95 96 static int x2apic_phys_probe(void) 97 { 98 if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys())) 99 return 1; 100 101 return apic == &apic_x2apic_phys; 102 } 103 104 /* Common x2apic functions, also used by x2apic_cluster */ 105 int x2apic_apic_id_valid(u32 apicid) 106 { 107 if (x2apic_max_apicid && apicid > x2apic_max_apicid) 108 return 0; 109 110 return 1; 111 } 112 113 int x2apic_apic_id_registered(void) 114 { 115 return 1; 116 } 117 118 void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest) 119 { 120 unsigned long cfg = __prepare_ICR(0, vector, dest); 121 native_x2apic_icr_write(cfg, apicid); 122 } 123 124 void __x2apic_send_IPI_shorthand(int vector, u32 which) 125 { 126 unsigned long cfg = __prepare_ICR(which, vector, 0); 127 128 x2apic_wrmsr_fence(); 129 native_x2apic_icr_write(cfg, 0); 130 } 131 132 unsigned int x2apic_get_apic_id(unsigned long id) 133 { 134 return id; 135 } 136 137 u32 x2apic_set_apic_id(unsigned int id) 138 { 139 return id; 140 } 141 142 int x2apic_phys_pkg_id(int initial_apicid, int index_msb) 143 { 144 return initial_apicid >> index_msb; 145 } 146 147 void x2apic_send_IPI_self(int vector) 148 { 149 apic_write(APIC_SELF_IPI, vector); 150 } 151 152 static struct apic apic_x2apic_phys __ro_after_init = { 153 154 .name = "physical x2apic", 155 .probe = x2apic_phys_probe, 156 .acpi_madt_oem_check = x2apic_acpi_madt_oem_check, 157 .apic_id_valid = x2apic_apic_id_valid, 158 .apic_id_registered = x2apic_apic_id_registered, 159 160 .irq_delivery_mode = dest_Fixed, 161 .irq_dest_mode = 0, /* physical */ 162 163 .disable_esr = 0, 164 .dest_logical = 0, 165 .check_apicid_used = NULL, 166 167 .init_apic_ldr = init_x2apic_ldr, 168 169 .ioapic_phys_id_map = NULL, 170 .setup_apic_routing = NULL, 171 .cpu_present_to_apicid = default_cpu_present_to_apicid, 172 .apicid_to_cpu_present = NULL, 173 .check_phys_apicid_present = default_check_phys_apicid_present, 174 .phys_pkg_id = x2apic_phys_pkg_id, 175 176 .get_apic_id = x2apic_get_apic_id, 177 .set_apic_id = x2apic_set_apic_id, 178 179 .calc_dest_apicid = apic_default_calc_apicid, 180 181 .send_IPI = x2apic_send_IPI, 182 .send_IPI_mask = x2apic_send_IPI_mask, 183 .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself, 184 .send_IPI_allbutself = x2apic_send_IPI_allbutself, 185 .send_IPI_all = x2apic_send_IPI_all, 186 .send_IPI_self = x2apic_send_IPI_self, 187 188 .inquire_remote_apic = NULL, 189 190 .read = native_apic_msr_read, 191 .write = native_apic_msr_write, 192 .eoi_write = native_apic_msr_eoi_write, 193 .icr_read = native_x2apic_icr_read, 194 .icr_write = native_x2apic_icr_write, 195 .wait_icr_idle = native_x2apic_wait_icr_idle, 196 .safe_wait_icr_idle = native_safe_x2apic_wait_icr_idle, 197 }; 198 199 apic_driver(apic_x2apic_phys); 200