1 #include <linux/threads.h> 2 #include <linux/cpumask.h> 3 #include <linux/string.h> 4 #include <linux/kernel.h> 5 #include <linux/ctype.h> 6 #include <linux/init.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 if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) && 26 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) { 27 printk(KERN_DEBUG "System requires x2apic physical mode\n"); 28 return true; 29 } 30 return false; 31 } 32 33 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 34 { 35 return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys()); 36 } 37 38 static void 39 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest) 40 { 41 unsigned long query_cpu; 42 unsigned long this_cpu; 43 unsigned long flags; 44 45 x2apic_wrmsr_fence(); 46 47 local_irq_save(flags); 48 49 this_cpu = smp_processor_id(); 50 for_each_cpu(query_cpu, mask) { 51 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu) 52 continue; 53 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu), 54 vector, APIC_DEST_PHYSICAL); 55 } 56 local_irq_restore(flags); 57 } 58 59 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector) 60 { 61 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC); 62 } 63 64 static void 65 x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector) 66 { 67 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT); 68 } 69 70 static void x2apic_send_IPI_allbutself(int vector) 71 { 72 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT); 73 } 74 75 static void x2apic_send_IPI_all(int vector) 76 { 77 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC); 78 } 79 80 static void init_x2apic_ldr(void) 81 { 82 } 83 84 static int x2apic_phys_probe(void) 85 { 86 if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys())) 87 return 1; 88 89 return apic == &apic_x2apic_phys; 90 } 91 92 static struct apic apic_x2apic_phys = { 93 94 .name = "physical x2apic", 95 .probe = x2apic_phys_probe, 96 .acpi_madt_oem_check = x2apic_acpi_madt_oem_check, 97 .apic_id_valid = x2apic_apic_id_valid, 98 .apic_id_registered = x2apic_apic_id_registered, 99 100 .irq_delivery_mode = dest_Fixed, 101 .irq_dest_mode = 0, /* physical */ 102 103 .target_cpus = online_target_cpus, 104 .disable_esr = 0, 105 .dest_logical = 0, 106 .check_apicid_used = NULL, 107 .check_apicid_present = NULL, 108 109 .vector_allocation_domain = default_vector_allocation_domain, 110 .init_apic_ldr = init_x2apic_ldr, 111 112 .ioapic_phys_id_map = NULL, 113 .setup_apic_routing = NULL, 114 .multi_timer_check = NULL, 115 .cpu_present_to_apicid = default_cpu_present_to_apicid, 116 .apicid_to_cpu_present = NULL, 117 .setup_portio_remap = NULL, 118 .check_phys_apicid_present = default_check_phys_apicid_present, 119 .enable_apic_mode = NULL, 120 .phys_pkg_id = x2apic_phys_pkg_id, 121 .mps_oem_check = NULL, 122 123 .get_apic_id = x2apic_get_apic_id, 124 .set_apic_id = x2apic_set_apic_id, 125 .apic_id_mask = 0xFFFFFFFFu, 126 127 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and, 128 129 .send_IPI_mask = x2apic_send_IPI_mask, 130 .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself, 131 .send_IPI_allbutself = x2apic_send_IPI_allbutself, 132 .send_IPI_all = x2apic_send_IPI_all, 133 .send_IPI_self = x2apic_send_IPI_self, 134 135 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW, 136 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH, 137 .wait_for_init_deassert = NULL, 138 .smp_callin_clear_local_apic = NULL, 139 .inquire_remote_apic = NULL, 140 141 .read = native_apic_msr_read, 142 .write = native_apic_msr_write, 143 .eoi_write = native_apic_msr_eoi_write, 144 .icr_read = native_x2apic_icr_read, 145 .icr_write = native_x2apic_icr_write, 146 .wait_icr_idle = native_x2apic_wait_icr_idle, 147 .safe_wait_icr_idle = native_safe_x2apic_wait_icr_idle, 148 }; 149 150 apic_driver(apic_x2apic_phys); 151