1 /* 2 * Copyright 2004 James Cleverdon, IBM. 3 * Subject to the GNU Public License, v.2 4 * 5 * Flat APIC subarch code. 6 * 7 * Hacked for x86-64 by James Cleverdon from i386 architecture code by 8 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and 9 * James Cleverdon. 10 */ 11 #include <linux/errno.h> 12 #include <linux/threads.h> 13 #include <linux/cpumask.h> 14 #include <linux/string.h> 15 #include <linux/kernel.h> 16 #include <linux/ctype.h> 17 #include <linux/init.h> 18 #include <linux/hardirq.h> 19 #include <linux/module.h> 20 #include <asm/smp.h> 21 #include <asm/apic.h> 22 #include <asm/ipi.h> 23 24 #ifdef CONFIG_ACPI 25 #include <acpi/acpi_bus.h> 26 #endif 27 28 static struct apic apic_physflat; 29 static struct apic apic_flat; 30 31 struct apic __read_mostly *apic = &apic_flat; 32 EXPORT_SYMBOL_GPL(apic); 33 34 static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 35 { 36 return 1; 37 } 38 39 static const struct cpumask *flat_target_cpus(void) 40 { 41 return cpu_online_mask; 42 } 43 44 static void flat_vector_allocation_domain(int cpu, struct cpumask *retmask) 45 { 46 /* Careful. Some cpus do not strictly honor the set of cpus 47 * specified in the interrupt destination when using lowest 48 * priority interrupt delivery mode. 49 * 50 * In particular there was a hyperthreading cpu observed to 51 * deliver interrupts to the wrong hyperthread when only one 52 * hyperthread was specified in the interrupt desitination. 53 */ 54 cpumask_clear(retmask); 55 cpumask_bits(retmask)[0] = APIC_ALL_CPUS; 56 } 57 58 /* 59 * Set up the logical destination ID. 60 * 61 * Intel recommends to set DFR, LDR and TPR before enabling 62 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel 63 * document number 292116). So here it goes... 64 */ 65 void flat_init_apic_ldr(void) 66 { 67 unsigned long val; 68 unsigned long num, id; 69 70 num = smp_processor_id(); 71 id = 1UL << num; 72 apic_write(APIC_DFR, APIC_DFR_FLAT); 73 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; 74 val |= SET_APIC_LOGICAL_ID(id); 75 apic_write(APIC_LDR, val); 76 } 77 78 static inline void _flat_send_IPI_mask(unsigned long mask, int vector) 79 { 80 unsigned long flags; 81 82 local_irq_save(flags); 83 __default_send_IPI_dest_field(mask, vector, apic->dest_logical); 84 local_irq_restore(flags); 85 } 86 87 static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector) 88 { 89 unsigned long mask = cpumask_bits(cpumask)[0]; 90 91 _flat_send_IPI_mask(mask, vector); 92 } 93 94 static void 95 flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) 96 { 97 unsigned long mask = cpumask_bits(cpumask)[0]; 98 int cpu = smp_processor_id(); 99 100 if (cpu < BITS_PER_LONG) 101 clear_bit(cpu, &mask); 102 103 _flat_send_IPI_mask(mask, vector); 104 } 105 106 static void flat_send_IPI_allbutself(int vector) 107 { 108 int cpu = smp_processor_id(); 109 #ifdef CONFIG_HOTPLUG_CPU 110 int hotplug = 1; 111 #else 112 int hotplug = 0; 113 #endif 114 if (hotplug || vector == NMI_VECTOR) { 115 if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) { 116 unsigned long mask = cpumask_bits(cpu_online_mask)[0]; 117 118 if (cpu < BITS_PER_LONG) 119 clear_bit(cpu, &mask); 120 121 _flat_send_IPI_mask(mask, vector); 122 } 123 } else if (num_online_cpus() > 1) { 124 __default_send_IPI_shortcut(APIC_DEST_ALLBUT, 125 vector, apic->dest_logical); 126 } 127 } 128 129 static void flat_send_IPI_all(int vector) 130 { 131 if (vector == NMI_VECTOR) { 132 flat_send_IPI_mask(cpu_online_mask, vector); 133 } else { 134 __default_send_IPI_shortcut(APIC_DEST_ALLINC, 135 vector, apic->dest_logical); 136 } 137 } 138 139 static unsigned int flat_get_apic_id(unsigned long x) 140 { 141 unsigned int id; 142 143 id = (((x)>>24) & 0xFFu); 144 145 return id; 146 } 147 148 static unsigned long set_apic_id(unsigned int id) 149 { 150 unsigned long x; 151 152 x = ((id & 0xFFu)<<24); 153 return x; 154 } 155 156 static unsigned int read_xapic_id(void) 157 { 158 unsigned int id; 159 160 id = flat_get_apic_id(apic_read(APIC_ID)); 161 return id; 162 } 163 164 static int flat_apic_id_registered(void) 165 { 166 return physid_isset(read_xapic_id(), phys_cpu_present_map); 167 } 168 169 static int flat_phys_pkg_id(int initial_apic_id, int index_msb) 170 { 171 return initial_apic_id >> index_msb; 172 } 173 174 static int flat_probe(void) 175 { 176 return 1; 177 } 178 179 static struct apic apic_flat = { 180 .name = "flat", 181 .probe = flat_probe, 182 .acpi_madt_oem_check = flat_acpi_madt_oem_check, 183 .apic_id_registered = flat_apic_id_registered, 184 185 .irq_delivery_mode = dest_LowestPrio, 186 .irq_dest_mode = 1, /* logical */ 187 188 .target_cpus = flat_target_cpus, 189 .disable_esr = 0, 190 .dest_logical = APIC_DEST_LOGICAL, 191 .check_apicid_used = NULL, 192 .check_apicid_present = NULL, 193 194 .vector_allocation_domain = flat_vector_allocation_domain, 195 .init_apic_ldr = flat_init_apic_ldr, 196 197 .ioapic_phys_id_map = NULL, 198 .setup_apic_routing = NULL, 199 .multi_timer_check = NULL, 200 .cpu_present_to_apicid = default_cpu_present_to_apicid, 201 .apicid_to_cpu_present = NULL, 202 .setup_portio_remap = NULL, 203 .check_phys_apicid_present = default_check_phys_apicid_present, 204 .enable_apic_mode = NULL, 205 .phys_pkg_id = flat_phys_pkg_id, 206 .mps_oem_check = NULL, 207 208 .get_apic_id = flat_get_apic_id, 209 .set_apic_id = set_apic_id, 210 .apic_id_mask = 0xFFu << 24, 211 212 .cpu_mask_to_apicid = default_cpu_mask_to_apicid, 213 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and, 214 215 .send_IPI_mask = flat_send_IPI_mask, 216 .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself, 217 .send_IPI_allbutself = flat_send_IPI_allbutself, 218 .send_IPI_all = flat_send_IPI_all, 219 .send_IPI_self = apic_send_IPI_self, 220 221 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW, 222 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH, 223 .wait_for_init_deassert = NULL, 224 .smp_callin_clear_local_apic = NULL, 225 .inquire_remote_apic = default_inquire_remote_apic, 226 227 .read = native_apic_mem_read, 228 .write = native_apic_mem_write, 229 .icr_read = native_apic_icr_read, 230 .icr_write = native_apic_icr_write, 231 .wait_icr_idle = native_apic_wait_icr_idle, 232 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 233 }; 234 235 /* 236 * Physflat mode is used when there are more than 8 CPUs on a system. 237 * We cannot use logical delivery in this case because the mask 238 * overflows, so use physical mode. 239 */ 240 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 241 { 242 #ifdef CONFIG_ACPI 243 /* 244 * Quirk: some x86_64 machines can only use physical APIC mode 245 * regardless of how many processors are present (x86_64 ES7000 246 * is an example). 247 */ 248 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID && 249 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) { 250 printk(KERN_DEBUG "system APIC only can use physical flat"); 251 return 1; 252 } 253 254 if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) { 255 printk(KERN_DEBUG "IBM Summit detected, will use apic physical"); 256 return 1; 257 } 258 #endif 259 260 return 0; 261 } 262 263 static const struct cpumask *physflat_target_cpus(void) 264 { 265 return cpu_online_mask; 266 } 267 268 static void physflat_vector_allocation_domain(int cpu, struct cpumask *retmask) 269 { 270 cpumask_clear(retmask); 271 cpumask_set_cpu(cpu, retmask); 272 } 273 274 static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector) 275 { 276 default_send_IPI_mask_sequence_phys(cpumask, vector); 277 } 278 279 static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask, 280 int vector) 281 { 282 default_send_IPI_mask_allbutself_phys(cpumask, vector); 283 } 284 285 static void physflat_send_IPI_allbutself(int vector) 286 { 287 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 288 } 289 290 static void physflat_send_IPI_all(int vector) 291 { 292 physflat_send_IPI_mask(cpu_online_mask, vector); 293 } 294 295 static unsigned int physflat_cpu_mask_to_apicid(const struct cpumask *cpumask) 296 { 297 int cpu; 298 299 /* 300 * We're using fixed IRQ delivery, can only return one phys APIC ID. 301 * May as well be the first. 302 */ 303 cpu = cpumask_first(cpumask); 304 if ((unsigned)cpu < nr_cpu_ids) 305 return per_cpu(x86_cpu_to_apicid, cpu); 306 else 307 return BAD_APICID; 308 } 309 310 static unsigned int 311 physflat_cpu_mask_to_apicid_and(const struct cpumask *cpumask, 312 const struct cpumask *andmask) 313 { 314 int cpu; 315 316 /* 317 * We're using fixed IRQ delivery, can only return one phys APIC ID. 318 * May as well be the first. 319 */ 320 for_each_cpu_and(cpu, cpumask, andmask) { 321 if (cpumask_test_cpu(cpu, cpu_online_mask)) 322 break; 323 } 324 return per_cpu(x86_cpu_to_apicid, cpu); 325 } 326 327 static int physflat_probe(void) 328 { 329 if (apic == &apic_physflat || num_possible_cpus() > 8) 330 return 1; 331 332 return 0; 333 } 334 335 static struct apic apic_physflat = { 336 337 .name = "physical flat", 338 .probe = physflat_probe, 339 .acpi_madt_oem_check = physflat_acpi_madt_oem_check, 340 .apic_id_registered = flat_apic_id_registered, 341 342 .irq_delivery_mode = dest_Fixed, 343 .irq_dest_mode = 0, /* physical */ 344 345 .target_cpus = physflat_target_cpus, 346 .disable_esr = 0, 347 .dest_logical = 0, 348 .check_apicid_used = NULL, 349 .check_apicid_present = NULL, 350 351 .vector_allocation_domain = physflat_vector_allocation_domain, 352 /* not needed, but shouldn't hurt: */ 353 .init_apic_ldr = flat_init_apic_ldr, 354 355 .ioapic_phys_id_map = NULL, 356 .setup_apic_routing = NULL, 357 .multi_timer_check = NULL, 358 .cpu_present_to_apicid = default_cpu_present_to_apicid, 359 .apicid_to_cpu_present = NULL, 360 .setup_portio_remap = NULL, 361 .check_phys_apicid_present = default_check_phys_apicid_present, 362 .enable_apic_mode = NULL, 363 .phys_pkg_id = flat_phys_pkg_id, 364 .mps_oem_check = NULL, 365 366 .get_apic_id = flat_get_apic_id, 367 .set_apic_id = set_apic_id, 368 .apic_id_mask = 0xFFu << 24, 369 370 .cpu_mask_to_apicid = physflat_cpu_mask_to_apicid, 371 .cpu_mask_to_apicid_and = physflat_cpu_mask_to_apicid_and, 372 373 .send_IPI_mask = physflat_send_IPI_mask, 374 .send_IPI_mask_allbutself = physflat_send_IPI_mask_allbutself, 375 .send_IPI_allbutself = physflat_send_IPI_allbutself, 376 .send_IPI_all = physflat_send_IPI_all, 377 .send_IPI_self = apic_send_IPI_self, 378 379 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW, 380 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH, 381 .wait_for_init_deassert = NULL, 382 .smp_callin_clear_local_apic = NULL, 383 .inquire_remote_apic = default_inquire_remote_apic, 384 385 .read = native_apic_mem_read, 386 .write = native_apic_mem_write, 387 .icr_read = native_apic_icr_read, 388 .icr_write = native_apic_icr_write, 389 .wait_icr_idle = native_apic_wait_icr_idle, 390 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 391 }; 392 393 /* 394 * We need to check for physflat first, so this order is important. 395 */ 396 apic_drivers(apic_physflat, apic_flat); 397