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