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/threads.h> 24 #include <linux/cpumask.h> 25 #include <asm/mpspec.h> 26 #include <asm/fixmap.h> 27 #include <asm/apicdef.h> 28 #include <linux/kernel.h> 29 #include <linux/string.h> 30 #include <linux/smp.h> 31 #include <linux/init.h> 32 #include <asm/ipi.h> 33 34 #include <linux/smp.h> 35 #include <linux/init.h> 36 #include <linux/interrupt.h> 37 #include <asm/acpi.h> 38 #include <asm/e820.h> 39 #include <asm/setup.h> 40 41 #ifdef CONFIG_HOTPLUG_CPU 42 #define DEFAULT_SEND_IPI (1) 43 #else 44 #define DEFAULT_SEND_IPI (0) 45 #endif 46 47 int no_broadcast = DEFAULT_SEND_IPI; 48 49 static __init int no_ipi_broadcast(char *str) 50 { 51 get_option(&str, &no_broadcast); 52 pr_info("Using %s mode\n", 53 no_broadcast ? "No IPI Broadcast" : "IPI Broadcast"); 54 return 1; 55 } 56 __setup("no_ipi_broadcast=", no_ipi_broadcast); 57 58 static int __init print_ipi_mode(void) 59 { 60 pr_info("Using IPI %s mode\n", 61 no_broadcast ? "No-Shortcut" : "Shortcut"); 62 return 0; 63 } 64 late_initcall(print_ipi_mode); 65 66 void default_setup_apic_routing(void) 67 { 68 #ifdef CONFIG_X86_IO_APIC 69 printk(KERN_INFO 70 "Enabling APIC mode: Flat. Using %d I/O APICs\n", 71 nr_ioapics); 72 #endif 73 } 74 75 static void default_vector_allocation_domain(int cpu, struct cpumask *retmask) 76 { 77 /* 78 * Careful. Some cpus do not strictly honor the set of cpus 79 * specified in the interrupt destination when using lowest 80 * priority interrupt delivery mode. 81 * 82 * In particular there was a hyperthreading cpu observed to 83 * deliver interrupts to the wrong hyperthread when only one 84 * hyperthread was specified in the interrupt desitination. 85 */ 86 cpumask_clear(retmask); 87 cpumask_bits(retmask)[0] = APIC_ALL_CPUS; 88 } 89 90 /* should be called last. */ 91 static int probe_default(void) 92 { 93 return 1; 94 } 95 96 struct apic apic_default = { 97 98 .name = "default", 99 .probe = probe_default, 100 .acpi_madt_oem_check = NULL, 101 .apic_id_registered = default_apic_id_registered, 102 103 .irq_delivery_mode = dest_LowestPrio, 104 /* logical delivery broadcast to all CPUs: */ 105 .irq_dest_mode = 1, 106 107 .target_cpus = default_target_cpus, 108 .disable_esr = 0, 109 .dest_logical = APIC_DEST_LOGICAL, 110 .check_apicid_used = default_check_apicid_used, 111 .check_apicid_present = default_check_apicid_present, 112 113 .vector_allocation_domain = default_vector_allocation_domain, 114 .init_apic_ldr = default_init_apic_ldr, 115 116 .ioapic_phys_id_map = default_ioapic_phys_id_map, 117 .setup_apic_routing = default_setup_apic_routing, 118 .multi_timer_check = NULL, 119 .apicid_to_node = default_apicid_to_node, 120 .cpu_to_logical_apicid = default_cpu_to_logical_apicid, 121 .cpu_present_to_apicid = default_cpu_present_to_apicid, 122 .apicid_to_cpu_present = default_apicid_to_cpu_present, 123 .setup_portio_remap = NULL, 124 .check_phys_apicid_present = default_check_phys_apicid_present, 125 .enable_apic_mode = NULL, 126 .phys_pkg_id = default_phys_pkg_id, 127 .mps_oem_check = NULL, 128 129 .get_apic_id = default_get_apic_id, 130 .set_apic_id = NULL, 131 .apic_id_mask = 0x0F << 24, 132 133 .cpu_mask_to_apicid = default_cpu_mask_to_apicid, 134 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and, 135 136 .send_IPI_mask = default_send_IPI_mask_logical, 137 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_logical, 138 .send_IPI_allbutself = default_send_IPI_allbutself, 139 .send_IPI_all = default_send_IPI_all, 140 .send_IPI_self = default_send_IPI_self, 141 142 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW, 143 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH, 144 145 .wait_for_init_deassert = default_wait_for_init_deassert, 146 147 .smp_callin_clear_local_apic = NULL, 148 .inquire_remote_apic = default_inquire_remote_apic, 149 150 .read = native_apic_mem_read, 151 .write = native_apic_mem_write, 152 .icr_read = native_apic_icr_read, 153 .icr_write = native_apic_icr_write, 154 .wait_icr_idle = native_apic_wait_icr_idle, 155 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 156 }; 157 158 extern struct apic apic_numaq; 159 extern struct apic apic_summit; 160 extern struct apic apic_bigsmp; 161 extern struct apic apic_es7000; 162 extern struct apic apic_es7000_cluster; 163 extern struct apic apic_default; 164 165 struct apic *apic = &apic_default; 166 EXPORT_SYMBOL_GPL(apic); 167 168 static struct apic *apic_probe[] __initdata = { 169 #ifdef CONFIG_X86_NUMAQ 170 &apic_numaq, 171 #endif 172 #ifdef CONFIG_X86_SUMMIT 173 &apic_summit, 174 #endif 175 #ifdef CONFIG_X86_BIGSMP 176 &apic_bigsmp, 177 #endif 178 #ifdef CONFIG_X86_ES7000 179 &apic_es7000, 180 &apic_es7000_cluster, 181 #endif 182 &apic_default, /* must be last */ 183 NULL, 184 }; 185 186 static int cmdline_apic __initdata; 187 static int __init parse_apic(char *arg) 188 { 189 int i; 190 191 if (!arg) 192 return -EINVAL; 193 194 for (i = 0; apic_probe[i]; i++) { 195 if (!strcmp(apic_probe[i]->name, arg)) { 196 apic = apic_probe[i]; 197 cmdline_apic = 1; 198 return 0; 199 } 200 } 201 202 /* Parsed again by __setup for debug/verbose */ 203 return 0; 204 } 205 early_param("apic", parse_apic); 206 207 void __init generic_bigsmp_probe(void) 208 { 209 #ifdef CONFIG_X86_BIGSMP 210 /* 211 * This routine is used to switch to bigsmp mode when 212 * - There is no apic= option specified by the user 213 * - generic_apic_probe() has chosen apic_default as the sub_arch 214 * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support 215 */ 216 217 if (!cmdline_apic && apic == &apic_default) { 218 if (apic_bigsmp.probe()) { 219 apic = &apic_bigsmp; 220 printk(KERN_INFO "Overriding APIC driver with %s\n", 221 apic->name); 222 } 223 } 224 #endif 225 } 226 227 void __init generic_apic_probe(void) 228 { 229 if (!cmdline_apic) { 230 int i; 231 for (i = 0; apic_probe[i]; i++) { 232 if (apic_probe[i]->probe()) { 233 apic = apic_probe[i]; 234 break; 235 } 236 } 237 /* Not visible without early console */ 238 if (!apic_probe[i]) 239 panic("Didn't find an APIC driver"); 240 } 241 printk(KERN_INFO "Using APIC driver %s\n", apic->name); 242 } 243 244 /* These functions can switch the APIC even after the initial ->probe() */ 245 246 int __init 247 generic_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid) 248 { 249 int i; 250 251 for (i = 0; apic_probe[i]; ++i) { 252 if (!apic_probe[i]->mps_oem_check) 253 continue; 254 if (!apic_probe[i]->mps_oem_check(mpc, oem, productid)) 255 continue; 256 257 if (!cmdline_apic) { 258 apic = apic_probe[i]; 259 printk(KERN_INFO "Switched to APIC driver `%s'.\n", 260 apic->name); 261 } 262 return 1; 263 } 264 return 0; 265 } 266 267 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 268 { 269 int i; 270 271 for (i = 0; apic_probe[i]; ++i) { 272 if (!apic_probe[i]->acpi_madt_oem_check) 273 continue; 274 if (!apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) 275 continue; 276 277 if (!cmdline_apic) { 278 apic = apic_probe[i]; 279 printk(KERN_INFO "Switched to APIC driver `%s'.\n", 280 apic->name); 281 } 282 return 1; 283 } 284 return 0; 285 } 286