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/x2apic.h> 11 12 int x2apic_phys; 13 14 static struct apic apic_x2apic_phys; 15 16 static int set_x2apic_phys_mode(char *arg) 17 { 18 x2apic_phys = 1; 19 return 0; 20 } 21 early_param("x2apic_phys", set_x2apic_phys_mode); 22 23 static bool x2apic_fadt_phys(void) 24 { 25 #ifdef CONFIG_ACPI 26 if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) && 27 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) { 28 printk(KERN_DEBUG "System requires x2apic physical mode\n"); 29 return true; 30 } 31 #endif 32 return false; 33 } 34 35 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 36 { 37 return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys()); 38 } 39 40 static void x2apic_send_IPI(int cpu, int vector) 41 { 42 u32 dest = per_cpu(x86_cpu_to_apicid, cpu); 43 44 x2apic_wrmsr_fence(); 45 __x2apic_send_IPI_dest(dest, vector, APIC_DEST_PHYSICAL); 46 } 47 48 static void 49 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest) 50 { 51 unsigned long query_cpu; 52 unsigned long this_cpu; 53 unsigned long flags; 54 55 x2apic_wrmsr_fence(); 56 57 local_irq_save(flags); 58 59 this_cpu = smp_processor_id(); 60 for_each_cpu(query_cpu, mask) { 61 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu) 62 continue; 63 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu), 64 vector, APIC_DEST_PHYSICAL); 65 } 66 local_irq_restore(flags); 67 } 68 69 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector) 70 { 71 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC); 72 } 73 74 static void 75 x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector) 76 { 77 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT); 78 } 79 80 static void x2apic_send_IPI_allbutself(int vector) 81 { 82 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT); 83 } 84 85 static void x2apic_send_IPI_all(int vector) 86 { 87 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC); 88 } 89 90 static void init_x2apic_ldr(void) 91 { 92 } 93 94 static int x2apic_phys_probe(void) 95 { 96 if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys())) 97 return 1; 98 99 return apic == &apic_x2apic_phys; 100 } 101 102 static struct apic apic_x2apic_phys __ro_after_init = { 103 104 .name = "physical x2apic", 105 .probe = x2apic_phys_probe, 106 .acpi_madt_oem_check = x2apic_acpi_madt_oem_check, 107 .apic_id_valid = x2apic_apic_id_valid, 108 .apic_id_registered = x2apic_apic_id_registered, 109 110 .irq_delivery_mode = dest_Fixed, 111 .irq_dest_mode = 0, /* physical */ 112 113 .target_cpus = online_target_cpus, 114 .disable_esr = 0, 115 .dest_logical = 0, 116 .check_apicid_used = NULL, 117 118 .vector_allocation_domain = default_vector_allocation_domain, 119 .init_apic_ldr = init_x2apic_ldr, 120 121 .ioapic_phys_id_map = NULL, 122 .setup_apic_routing = NULL, 123 .cpu_present_to_apicid = default_cpu_present_to_apicid, 124 .apicid_to_cpu_present = NULL, 125 .check_phys_apicid_present = default_check_phys_apicid_present, 126 .phys_pkg_id = x2apic_phys_pkg_id, 127 128 .get_apic_id = x2apic_get_apic_id, 129 .set_apic_id = x2apic_set_apic_id, 130 131 .cpu_mask_to_apicid = default_cpu_mask_to_apicid, 132 133 .send_IPI = x2apic_send_IPI, 134 .send_IPI_mask = x2apic_send_IPI_mask, 135 .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself, 136 .send_IPI_allbutself = x2apic_send_IPI_allbutself, 137 .send_IPI_all = x2apic_send_IPI_all, 138 .send_IPI_self = x2apic_send_IPI_self, 139 140 .inquire_remote_apic = NULL, 141 142 .read = native_apic_msr_read, 143 .write = native_apic_msr_write, 144 .eoi_write = native_apic_msr_eoi_write, 145 .icr_read = native_x2apic_icr_read, 146 .icr_write = native_x2apic_icr_write, 147 .wait_icr_idle = native_x2apic_wait_icr_idle, 148 .safe_wait_icr_idle = native_safe_x2apic_wait_icr_idle, 149 }; 150 151 apic_driver(apic_x2apic_phys); 152