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/dmar.h> 7 8 #include <asm/smp.h> 9 #include <asm/x2apic.h> 10 11 int x2apic_phys; 12 13 static struct apic apic_x2apic_phys; 14 15 static int set_x2apic_phys_mode(char *arg) 16 { 17 x2apic_phys = 1; 18 return 0; 19 } 20 early_param("x2apic_phys", set_x2apic_phys_mode); 21 22 static bool x2apic_fadt_phys(void) 23 { 24 #ifdef CONFIG_ACPI 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 #endif 31 return false; 32 } 33 34 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 35 { 36 return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys()); 37 } 38 39 static void 40 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest) 41 { 42 unsigned long query_cpu; 43 unsigned long this_cpu; 44 unsigned long flags; 45 46 x2apic_wrmsr_fence(); 47 48 local_irq_save(flags); 49 50 this_cpu = smp_processor_id(); 51 for_each_cpu(query_cpu, mask) { 52 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu) 53 continue; 54 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu), 55 vector, APIC_DEST_PHYSICAL); 56 } 57 local_irq_restore(flags); 58 } 59 60 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector) 61 { 62 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC); 63 } 64 65 static void 66 x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector) 67 { 68 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT); 69 } 70 71 static void x2apic_send_IPI_allbutself(int vector) 72 { 73 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT); 74 } 75 76 static void x2apic_send_IPI_all(int vector) 77 { 78 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC); 79 } 80 81 static void init_x2apic_ldr(void) 82 { 83 } 84 85 static int x2apic_phys_probe(void) 86 { 87 if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys())) 88 return 1; 89 90 return apic == &apic_x2apic_phys; 91 } 92 93 static struct apic apic_x2apic_phys = { 94 95 .name = "physical x2apic", 96 .probe = x2apic_phys_probe, 97 .acpi_madt_oem_check = x2apic_acpi_madt_oem_check, 98 .apic_id_valid = x2apic_apic_id_valid, 99 .apic_id_registered = x2apic_apic_id_registered, 100 101 .irq_delivery_mode = dest_Fixed, 102 .irq_dest_mode = 0, /* physical */ 103 104 .target_cpus = online_target_cpus, 105 .disable_esr = 0, 106 .dest_logical = 0, 107 .check_apicid_used = 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 .cpu_present_to_apicid = default_cpu_present_to_apicid, 115 .apicid_to_cpu_present = NULL, 116 .check_phys_apicid_present = default_check_phys_apicid_present, 117 .phys_pkg_id = x2apic_phys_pkg_id, 118 119 .get_apic_id = x2apic_get_apic_id, 120 .set_apic_id = x2apic_set_apic_id, 121 .apic_id_mask = 0xFFFFFFFFu, 122 123 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and, 124 125 .send_IPI_mask = x2apic_send_IPI_mask, 126 .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself, 127 .send_IPI_allbutself = x2apic_send_IPI_allbutself, 128 .send_IPI_all = x2apic_send_IPI_all, 129 .send_IPI_self = x2apic_send_IPI_self, 130 131 .inquire_remote_apic = NULL, 132 133 .read = native_apic_msr_read, 134 .write = native_apic_msr_write, 135 .eoi_write = native_apic_msr_eoi_write, 136 .icr_read = native_x2apic_icr_read, 137 .icr_write = native_x2apic_icr_write, 138 .wait_icr_idle = native_x2apic_wait_icr_idle, 139 .safe_wait_icr_idle = native_safe_x2apic_wait_icr_idle, 140 }; 141 142 apic_driver(apic_x2apic_phys); 143