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 MSRs are special and need a special fence: */ 47 weak_wrmsr_fence(); 48 __x2apic_send_IPI_dest(dest, vector, APIC_DEST_PHYSICAL); 49 } 50 51 static void 52 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest) 53 { 54 unsigned long query_cpu; 55 unsigned long this_cpu; 56 unsigned long flags; 57 58 /* x2apic MSRs are special and need a special fence: */ 59 weak_wrmsr_fence(); 60 61 local_irq_save(flags); 62 63 this_cpu = smp_processor_id(); 64 for_each_cpu(query_cpu, mask) { 65 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu) 66 continue; 67 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu), 68 vector, APIC_DEST_PHYSICAL); 69 } 70 local_irq_restore(flags); 71 } 72 73 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector) 74 { 75 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC); 76 } 77 78 static void 79 x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector) 80 { 81 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT); 82 } 83 84 static void __x2apic_send_IPI_shorthand(int vector, u32 which) 85 { 86 unsigned long cfg = __prepare_ICR(which, vector, 0); 87 88 /* x2apic MSRs are special and need a special fence: */ 89 weak_wrmsr_fence(); 90 native_x2apic_icr_write(cfg, 0); 91 } 92 93 void x2apic_send_IPI_allbutself(int vector) 94 { 95 __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLBUT); 96 } 97 98 void x2apic_send_IPI_all(int vector) 99 { 100 __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLINC); 101 } 102 103 void x2apic_send_IPI_self(int vector) 104 { 105 apic_write(APIC_SELF_IPI, vector); 106 } 107 108 void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest) 109 { 110 unsigned long cfg = __prepare_ICR(0, vector, dest); 111 native_x2apic_icr_write(cfg, apicid); 112 } 113 114 static int x2apic_phys_probe(void) 115 { 116 if (!x2apic_mode) 117 return 0; 118 119 if (x2apic_phys || x2apic_fadt_phys()) 120 return 1; 121 122 return apic == &apic_x2apic_phys; 123 } 124 125 /* Common x2apic functions, also used by x2apic_cluster */ 126 int x2apic_apic_id_valid(u32 apicid) 127 { 128 if (x2apic_max_apicid && apicid > x2apic_max_apicid) 129 return 0; 130 131 return 1; 132 } 133 134 unsigned int x2apic_get_apic_id(unsigned long id) 135 { 136 return id; 137 } 138 139 u32 x2apic_set_apic_id(unsigned int id) 140 { 141 return id; 142 } 143 144 int x2apic_phys_pkg_id(int initial_apicid, int index_msb) 145 { 146 return initial_apicid >> index_msb; 147 } 148 149 static struct apic apic_x2apic_phys __ro_after_init = { 150 151 .name = "physical x2apic", 152 .probe = x2apic_phys_probe, 153 .acpi_madt_oem_check = x2apic_acpi_madt_oem_check, 154 .apic_id_valid = x2apic_apic_id_valid, 155 156 .delivery_mode = APIC_DELIVERY_MODE_FIXED, 157 .dest_mode_logical = false, 158 159 .disable_esr = 0, 160 161 .check_apicid_used = NULL, 162 .ioapic_phys_id_map = NULL, 163 .cpu_present_to_apicid = default_cpu_present_to_apicid, 164 .phys_pkg_id = x2apic_phys_pkg_id, 165 166 .max_apic_id = UINT_MAX, 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 .read = native_apic_msr_read, 180 .write = native_apic_msr_write, 181 .eoi_write = native_apic_msr_eoi_write, 182 .icr_read = native_x2apic_icr_read, 183 .icr_write = native_x2apic_icr_write, 184 }; 185 186 apic_driver(apic_x2apic_phys); 187