1 /* 2 * Default generic APIC driver. This handles up to 8 CPUs. 3 * 4 * Copyright 2003 Andi Kleen, SuSE Labs. 5 * Subject to the GNU Public License, v.2 6 * 7 * Generic x86 APIC driver probe layer. 8 */ 9 #include <linux/threads.h> 10 #include <linux/cpumask.h> 11 #include <linux/module.h> 12 #include <linux/string.h> 13 #include <linux/kernel.h> 14 #include <linux/ctype.h> 15 #include <linux/init.h> 16 #include <linux/errno.h> 17 #include <asm/fixmap.h> 18 #include <asm/mpspec.h> 19 #include <asm/apicdef.h> 20 #include <asm/apic.h> 21 #include <asm/setup.h> 22 23 #include <linux/smp.h> 24 #include <asm/ipi.h> 25 26 #include <linux/interrupt.h> 27 #include <asm/acpi.h> 28 #include <asm/e820.h> 29 30 #ifdef CONFIG_HOTPLUG_CPU 31 #define DEFAULT_SEND_IPI (1) 32 #else 33 #define DEFAULT_SEND_IPI (0) 34 #endif 35 36 int no_broadcast = DEFAULT_SEND_IPI; 37 38 static __init int no_ipi_broadcast(char *str) 39 { 40 get_option(&str, &no_broadcast); 41 pr_info("Using %s mode\n", 42 no_broadcast ? "No IPI Broadcast" : "IPI Broadcast"); 43 return 1; 44 } 45 __setup("no_ipi_broadcast=", no_ipi_broadcast); 46 47 static int __init print_ipi_mode(void) 48 { 49 pr_info("Using IPI %s mode\n", 50 no_broadcast ? "No-Shortcut" : "Shortcut"); 51 return 0; 52 } 53 late_initcall(print_ipi_mode); 54 55 static int default_x86_32_early_logical_apicid(int cpu) 56 { 57 return 1 << cpu; 58 } 59 60 static void setup_apic_flat_routing(void) 61 { 62 #ifdef CONFIG_X86_IO_APIC 63 printk(KERN_INFO 64 "Enabling APIC mode: Flat. Using %d I/O APICs\n", 65 nr_ioapics); 66 #endif 67 } 68 69 static void default_vector_allocation_domain(int cpu, struct cpumask *retmask) 70 { 71 /* 72 * Careful. Some cpus do not strictly honor the set of cpus 73 * specified in the interrupt destination when using lowest 74 * priority interrupt delivery mode. 75 * 76 * In particular there was a hyperthreading cpu observed to 77 * deliver interrupts to the wrong hyperthread when only one 78 * hyperthread was specified in the interrupt desitination. 79 */ 80 cpumask_clear(retmask); 81 cpumask_bits(retmask)[0] = APIC_ALL_CPUS; 82 } 83 84 /* should be called last. */ 85 static int probe_default(void) 86 { 87 return 1; 88 } 89 90 static struct apic apic_default = { 91 92 .name = "default", 93 .probe = probe_default, 94 .acpi_madt_oem_check = NULL, 95 .apic_id_valid = default_apic_id_valid, 96 .apic_id_registered = default_apic_id_registered, 97 98 .irq_delivery_mode = dest_LowestPrio, 99 /* logical delivery broadcast to all CPUs: */ 100 .irq_dest_mode = 1, 101 102 .target_cpus = default_target_cpus, 103 .disable_esr = 0, 104 .dest_logical = APIC_DEST_LOGICAL, 105 .check_apicid_used = default_check_apicid_used, 106 .check_apicid_present = default_check_apicid_present, 107 108 .vector_allocation_domain = default_vector_allocation_domain, 109 .init_apic_ldr = default_init_apic_ldr, 110 111 .ioapic_phys_id_map = default_ioapic_phys_id_map, 112 .setup_apic_routing = setup_apic_flat_routing, 113 .multi_timer_check = NULL, 114 .cpu_present_to_apicid = default_cpu_present_to_apicid, 115 .apicid_to_cpu_present = physid_set_mask_of_physid, 116 .setup_portio_remap = NULL, 117 .check_phys_apicid_present = default_check_phys_apicid_present, 118 .enable_apic_mode = NULL, 119 .phys_pkg_id = default_phys_pkg_id, 120 .mps_oem_check = NULL, 121 122 .get_apic_id = default_get_apic_id, 123 .set_apic_id = NULL, 124 .apic_id_mask = 0x0F << 24, 125 126 .cpu_mask_to_apicid = default_cpu_mask_to_apicid, 127 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and, 128 129 .send_IPI_mask = default_send_IPI_mask_logical, 130 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_logical, 131 .send_IPI_allbutself = default_send_IPI_allbutself, 132 .send_IPI_all = default_send_IPI_all, 133 .send_IPI_self = default_send_IPI_self, 134 135 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW, 136 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH, 137 138 .wait_for_init_deassert = default_wait_for_init_deassert, 139 140 .smp_callin_clear_local_apic = NULL, 141 .inquire_remote_apic = default_inquire_remote_apic, 142 143 .read = native_apic_mem_read, 144 .write = native_apic_mem_write, 145 .icr_read = native_apic_icr_read, 146 .icr_write = native_apic_icr_write, 147 .wait_icr_idle = native_apic_wait_icr_idle, 148 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 149 150 .x86_32_early_logical_apicid = default_x86_32_early_logical_apicid, 151 }; 152 153 apic_driver(apic_default); 154 155 struct apic *apic = &apic_default; 156 EXPORT_SYMBOL_GPL(apic); 157 158 static int cmdline_apic __initdata; 159 static int __init parse_apic(char *arg) 160 { 161 struct apic **drv; 162 163 if (!arg) 164 return -EINVAL; 165 166 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { 167 if (!strcmp((*drv)->name, arg)) { 168 apic = *drv; 169 cmdline_apic = 1; 170 return 0; 171 } 172 } 173 174 /* Parsed again by __setup for debug/verbose */ 175 return 0; 176 } 177 early_param("apic", parse_apic); 178 179 void __init default_setup_apic_routing(void) 180 { 181 int version = apic_version[boot_cpu_physical_apicid]; 182 183 if (num_possible_cpus() > 8) { 184 switch (boot_cpu_data.x86_vendor) { 185 case X86_VENDOR_INTEL: 186 if (!APIC_XAPIC(version)) { 187 def_to_bigsmp = 0; 188 break; 189 } 190 /* If P4 and above fall through */ 191 case X86_VENDOR_AMD: 192 def_to_bigsmp = 1; 193 } 194 } 195 196 #ifdef CONFIG_X86_BIGSMP 197 /* 198 * This is used to switch to bigsmp mode when 199 * - There is no apic= option specified by the user 200 * - generic_apic_probe() has chosen apic_default as the sub_arch 201 * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support 202 */ 203 204 if (!cmdline_apic && apic == &apic_default) 205 generic_bigsmp_probe(); 206 #endif 207 208 if (apic->setup_apic_routing) 209 apic->setup_apic_routing(); 210 } 211 212 void __init generic_apic_probe(void) 213 { 214 if (!cmdline_apic) { 215 struct apic **drv; 216 217 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { 218 if ((*drv)->probe()) { 219 apic = *drv; 220 break; 221 } 222 } 223 /* Not visible without early console */ 224 if (drv == __apicdrivers_end) 225 panic("Didn't find an APIC driver"); 226 } 227 printk(KERN_INFO "Using APIC driver %s\n", apic->name); 228 } 229 230 /* These functions can switch the APIC even after the initial ->probe() */ 231 232 int __init 233 generic_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid) 234 { 235 struct apic **drv; 236 237 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { 238 if (!((*drv)->mps_oem_check)) 239 continue; 240 if (!(*drv)->mps_oem_check(mpc, oem, productid)) 241 continue; 242 243 if (!cmdline_apic) { 244 apic = *drv; 245 printk(KERN_INFO "Switched to APIC driver `%s'.\n", 246 apic->name); 247 } 248 return 1; 249 } 250 return 0; 251 } 252 253 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 254 { 255 struct apic **drv; 256 257 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { 258 if (!(*drv)->acpi_madt_oem_check) 259 continue; 260 if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id)) 261 continue; 262 263 if (!cmdline_apic) { 264 apic = *drv; 265 printk(KERN_INFO "Switched to APIC driver `%s'.\n", 266 apic->name); 267 } 268 return 1; 269 } 270 return 0; 271 } 272