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_registered = default_apic_id_registered, 96 97 .irq_delivery_mode = dest_LowestPrio, 98 /* logical delivery broadcast to all CPUs: */ 99 .irq_dest_mode = 1, 100 101 .target_cpus = default_target_cpus, 102 .disable_esr = 0, 103 .dest_logical = APIC_DEST_LOGICAL, 104 .check_apicid_used = default_check_apicid_used, 105 .check_apicid_present = default_check_apicid_present, 106 107 .vector_allocation_domain = default_vector_allocation_domain, 108 .init_apic_ldr = default_init_apic_ldr, 109 110 .ioapic_phys_id_map = default_ioapic_phys_id_map, 111 .setup_apic_routing = setup_apic_flat_routing, 112 .multi_timer_check = NULL, 113 .cpu_present_to_apicid = default_cpu_present_to_apicid, 114 .apicid_to_cpu_present = physid_set_mask_of_physid, 115 .setup_portio_remap = NULL, 116 .check_phys_apicid_present = default_check_phys_apicid_present, 117 .enable_apic_mode = NULL, 118 .phys_pkg_id = default_phys_pkg_id, 119 .mps_oem_check = NULL, 120 121 .get_apic_id = default_get_apic_id, 122 .set_apic_id = NULL, 123 .apic_id_mask = 0x0F << 24, 124 125 .cpu_mask_to_apicid = default_cpu_mask_to_apicid, 126 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and, 127 128 .send_IPI_mask = default_send_IPI_mask_logical, 129 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_logical, 130 .send_IPI_allbutself = default_send_IPI_allbutself, 131 .send_IPI_all = default_send_IPI_all, 132 .send_IPI_self = default_send_IPI_self, 133 134 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW, 135 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH, 136 137 .wait_for_init_deassert = default_wait_for_init_deassert, 138 139 .smp_callin_clear_local_apic = NULL, 140 .inquire_remote_apic = default_inquire_remote_apic, 141 142 .read = native_apic_mem_read, 143 .write = native_apic_mem_write, 144 .icr_read = native_apic_icr_read, 145 .icr_write = native_apic_icr_write, 146 .wait_icr_idle = native_apic_wait_icr_idle, 147 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 148 149 .x86_32_early_logical_apicid = default_x86_32_early_logical_apicid, 150 }; 151 152 apic_driver(apic_default); 153 154 struct apic *apic = &apic_default; 155 EXPORT_SYMBOL_GPL(apic); 156 157 static int cmdline_apic __initdata; 158 static int __init parse_apic(char *arg) 159 { 160 struct apic **drv; 161 162 if (!arg) 163 return -EINVAL; 164 165 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { 166 if (!strcmp((*drv)->name, arg)) { 167 apic = *drv; 168 cmdline_apic = 1; 169 return 0; 170 } 171 } 172 173 /* Parsed again by __setup for debug/verbose */ 174 return 0; 175 } 176 early_param("apic", parse_apic); 177 178 void __init default_setup_apic_routing(void) 179 { 180 int version = apic_version[boot_cpu_physical_apicid]; 181 182 if (num_possible_cpus() > 8) { 183 switch (boot_cpu_data.x86_vendor) { 184 case X86_VENDOR_INTEL: 185 if (!APIC_XAPIC(version)) { 186 def_to_bigsmp = 0; 187 break; 188 } 189 /* If P4 and above fall through */ 190 case X86_VENDOR_AMD: 191 def_to_bigsmp = 1; 192 } 193 } 194 195 #ifdef CONFIG_X86_BIGSMP 196 /* 197 * This is used to switch to bigsmp mode when 198 * - There is no apic= option specified by the user 199 * - generic_apic_probe() has chosen apic_default as the sub_arch 200 * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support 201 */ 202 203 if (!cmdline_apic && apic == &apic_default) 204 generic_bigsmp_probe(); 205 #endif 206 207 if (apic->setup_apic_routing) 208 apic->setup_apic_routing(); 209 } 210 211 void __init generic_apic_probe(void) 212 { 213 if (!cmdline_apic) { 214 struct apic **drv; 215 216 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { 217 if ((*drv)->probe()) { 218 apic = *drv; 219 break; 220 } 221 } 222 /* Not visible without early console */ 223 if (drv == __apicdrivers_end) 224 panic("Didn't find an APIC driver"); 225 } 226 printk(KERN_INFO "Using APIC driver %s\n", apic->name); 227 } 228 229 /* These functions can switch the APIC even after the initial ->probe() */ 230 231 int __init 232 generic_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid) 233 { 234 struct apic **drv; 235 236 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { 237 if (!((*drv)->mps_oem_check)) 238 continue; 239 if (!(*drv)->mps_oem_check(mpc, oem, productid)) 240 continue; 241 242 if (!cmdline_apic) { 243 apic = *drv; 244 printk(KERN_INFO "Switched to APIC driver `%s'.\n", 245 apic->name); 246 } 247 return 1; 248 } 249 return 0; 250 } 251 252 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 253 { 254 struct apic **drv; 255 256 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { 257 if (!(*drv)->acpi_madt_oem_check) 258 continue; 259 if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id)) 260 continue; 261 262 if (!cmdline_apic) { 263 apic = *drv; 264 printk(KERN_INFO "Switched to APIC driver `%s'.\n", 265 apic->name); 266 } 267 return 1; 268 } 269 return 0; 270 } 271