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