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 *retmask = (cpumask_t) { { [0] = APIC_ALL_CPUS } }; 87 } 88 89 /* should be called last. */ 90 static int probe_default(void) 91 { 92 return 1; 93 } 94 95 struct apic apic_default = { 96 97 .name = "default", 98 .probe = probe_default, 99 .acpi_madt_oem_check = NULL, 100 .apic_id_registered = default_apic_id_registered, 101 102 .irq_delivery_mode = dest_LowestPrio, 103 /* logical delivery broadcast to all CPUs: */ 104 .irq_dest_mode = 1, 105 106 .target_cpus = default_target_cpus, 107 .disable_esr = 0, 108 .dest_logical = APIC_DEST_LOGICAL, 109 .check_apicid_used = default_check_apicid_used, 110 .check_apicid_present = default_check_apicid_present, 111 112 .vector_allocation_domain = default_vector_allocation_domain, 113 .init_apic_ldr = default_init_apic_ldr, 114 115 .ioapic_phys_id_map = default_ioapic_phys_id_map, 116 .setup_apic_routing = default_setup_apic_routing, 117 .multi_timer_check = NULL, 118 .apicid_to_node = default_apicid_to_node, 119 .cpu_to_logical_apicid = default_cpu_to_logical_apicid, 120 .cpu_present_to_apicid = default_cpu_present_to_apicid, 121 .apicid_to_cpu_present = default_apicid_to_cpu_present, 122 .setup_portio_remap = NULL, 123 .check_phys_apicid_present = default_check_phys_apicid_present, 124 .enable_apic_mode = NULL, 125 .phys_pkg_id = default_phys_pkg_id, 126 .mps_oem_check = NULL, 127 128 .get_apic_id = default_get_apic_id, 129 .set_apic_id = NULL, 130 .apic_id_mask = 0x0F << 24, 131 132 .cpu_mask_to_apicid = default_cpu_mask_to_apicid, 133 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and, 134 135 .send_IPI_mask = default_send_IPI_mask_logical, 136 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_logical, 137 .send_IPI_allbutself = default_send_IPI_allbutself, 138 .send_IPI_all = default_send_IPI_all, 139 .send_IPI_self = default_send_IPI_self, 140 141 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW, 142 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH, 143 144 .wait_for_init_deassert = default_wait_for_init_deassert, 145 146 .smp_callin_clear_local_apic = NULL, 147 .inquire_remote_apic = default_inquire_remote_apic, 148 149 .read = native_apic_mem_read, 150 .write = native_apic_mem_write, 151 .icr_read = native_apic_icr_read, 152 .icr_write = native_apic_icr_write, 153 .wait_icr_idle = native_apic_wait_icr_idle, 154 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 155 }; 156 157 extern struct apic apic_numaq; 158 extern struct apic apic_summit; 159 extern struct apic apic_bigsmp; 160 extern struct apic apic_es7000; 161 extern struct apic apic_es7000_cluster; 162 extern struct apic apic_default; 163 164 struct apic *apic = &apic_default; 165 EXPORT_SYMBOL_GPL(apic); 166 167 static struct apic *apic_probe[] __initdata = { 168 #ifdef CONFIG_X86_NUMAQ 169 &apic_numaq, 170 #endif 171 #ifdef CONFIG_X86_SUMMIT 172 &apic_summit, 173 #endif 174 #ifdef CONFIG_X86_BIGSMP 175 &apic_bigsmp, 176 #endif 177 #ifdef CONFIG_X86_ES7000 178 &apic_es7000, 179 &apic_es7000_cluster, 180 #endif 181 &apic_default, /* must be last */ 182 NULL, 183 }; 184 185 static int cmdline_apic __initdata; 186 static int __init parse_apic(char *arg) 187 { 188 int i; 189 190 if (!arg) 191 return -EINVAL; 192 193 for (i = 0; apic_probe[i]; i++) { 194 if (!strcmp(apic_probe[i]->name, arg)) { 195 apic = apic_probe[i]; 196 cmdline_apic = 1; 197 return 0; 198 } 199 } 200 201 /* Parsed again by __setup for debug/verbose */ 202 return 0; 203 } 204 early_param("apic", parse_apic); 205 206 void __init generic_bigsmp_probe(void) 207 { 208 #ifdef CONFIG_X86_BIGSMP 209 /* 210 * This routine is used to switch to bigsmp mode when 211 * - There is no apic= option specified by the user 212 * - generic_apic_probe() has chosen apic_default as the sub_arch 213 * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support 214 */ 215 216 if (!cmdline_apic && apic == &apic_default) { 217 if (apic_bigsmp.probe()) { 218 apic = &apic_bigsmp; 219 printk(KERN_INFO "Overriding APIC driver with %s\n", 220 apic->name); 221 } 222 } 223 #endif 224 } 225 226 void __init generic_apic_probe(void) 227 { 228 if (!cmdline_apic) { 229 int i; 230 for (i = 0; apic_probe[i]; i++) { 231 if (apic_probe[i]->probe()) { 232 apic = apic_probe[i]; 233 break; 234 } 235 } 236 /* Not visible without early console */ 237 if (!apic_probe[i]) 238 panic("Didn't find an APIC driver"); 239 } 240 printk(KERN_INFO "Using APIC driver %s\n", apic->name); 241 } 242 243 /* These functions can switch the APIC even after the initial ->probe() */ 244 245 int __init 246 generic_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid) 247 { 248 int i; 249 250 for (i = 0; apic_probe[i]; ++i) { 251 if (!apic_probe[i]->mps_oem_check) 252 continue; 253 if (!apic_probe[i]->mps_oem_check(mpc, oem, productid)) 254 continue; 255 256 if (!cmdline_apic) { 257 apic = apic_probe[i]; 258 printk(KERN_INFO "Switched to APIC driver `%s'.\n", 259 apic->name); 260 } 261 return 1; 262 } 263 return 0; 264 } 265 266 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 267 { 268 int i; 269 270 for (i = 0; apic_probe[i]; ++i) { 271 if (!apic_probe[i]->acpi_madt_oem_check) 272 continue; 273 if (!apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) 274 continue; 275 276 if (!cmdline_apic) { 277 apic = apic_probe[i]; 278 printk(KERN_INFO "Switched to APIC driver `%s'.\n", 279 apic->name); 280 } 281 return 1; 282 } 283 return 0; 284 } 285