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