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 static 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 struct apic apic_flat = { 175 .name = "flat", 176 .probe = NULL, 177 .acpi_madt_oem_check = flat_acpi_madt_oem_check, 178 .apic_id_registered = flat_apic_id_registered, 179 180 .irq_delivery_mode = dest_LowestPrio, 181 .irq_dest_mode = 1, /* logical */ 182 183 .target_cpus = flat_target_cpus, 184 .disable_esr = 0, 185 .dest_logical = APIC_DEST_LOGICAL, 186 .check_apicid_used = NULL, 187 .check_apicid_present = NULL, 188 189 .vector_allocation_domain = flat_vector_allocation_domain, 190 .init_apic_ldr = flat_init_apic_ldr, 191 192 .ioapic_phys_id_map = NULL, 193 .setup_apic_routing = NULL, 194 .multi_timer_check = NULL, 195 .cpu_present_to_apicid = default_cpu_present_to_apicid, 196 .apicid_to_cpu_present = NULL, 197 .setup_portio_remap = NULL, 198 .check_phys_apicid_present = default_check_phys_apicid_present, 199 .enable_apic_mode = NULL, 200 .phys_pkg_id = flat_phys_pkg_id, 201 .mps_oem_check = NULL, 202 203 .get_apic_id = flat_get_apic_id, 204 .set_apic_id = set_apic_id, 205 .apic_id_mask = 0xFFu << 24, 206 207 .cpu_mask_to_apicid = default_cpu_mask_to_apicid, 208 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and, 209 210 .send_IPI_mask = flat_send_IPI_mask, 211 .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself, 212 .send_IPI_allbutself = flat_send_IPI_allbutself, 213 .send_IPI_all = flat_send_IPI_all, 214 .send_IPI_self = apic_send_IPI_self, 215 216 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW, 217 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH, 218 .wait_for_init_deassert = NULL, 219 .smp_callin_clear_local_apic = NULL, 220 .inquire_remote_apic = default_inquire_remote_apic, 221 222 .read = native_apic_mem_read, 223 .write = native_apic_mem_write, 224 .icr_read = native_apic_icr_read, 225 .icr_write = native_apic_icr_write, 226 .wait_icr_idle = native_apic_wait_icr_idle, 227 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 228 }; 229 230 /* 231 * Physflat mode is used when there are more than 8 CPUs on a system. 232 * We cannot use logical delivery in this case because the mask 233 * overflows, so use physical mode. 234 */ 235 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 236 { 237 #ifdef CONFIG_ACPI 238 /* 239 * Quirk: some x86_64 machines can only use physical APIC mode 240 * regardless of how many processors are present (x86_64 ES7000 241 * is an example). 242 */ 243 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID && 244 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) { 245 printk(KERN_DEBUG "system APIC only can use physical flat"); 246 return 1; 247 } 248 249 if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) { 250 printk(KERN_DEBUG "IBM Summit detected, will use apic physical"); 251 return 1; 252 } 253 #endif 254 255 return 0; 256 } 257 258 static const struct cpumask *physflat_target_cpus(void) 259 { 260 return cpu_online_mask; 261 } 262 263 static void physflat_vector_allocation_domain(int cpu, struct cpumask *retmask) 264 { 265 cpumask_clear(retmask); 266 cpumask_set_cpu(cpu, retmask); 267 } 268 269 static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector) 270 { 271 default_send_IPI_mask_sequence_phys(cpumask, vector); 272 } 273 274 static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask, 275 int vector) 276 { 277 default_send_IPI_mask_allbutself_phys(cpumask, vector); 278 } 279 280 static void physflat_send_IPI_allbutself(int vector) 281 { 282 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 283 } 284 285 static void physflat_send_IPI_all(int vector) 286 { 287 physflat_send_IPI_mask(cpu_online_mask, vector); 288 } 289 290 static unsigned int physflat_cpu_mask_to_apicid(const struct cpumask *cpumask) 291 { 292 int cpu; 293 294 /* 295 * We're using fixed IRQ delivery, can only return one phys APIC ID. 296 * May as well be the first. 297 */ 298 cpu = cpumask_first(cpumask); 299 if ((unsigned)cpu < nr_cpu_ids) 300 return per_cpu(x86_cpu_to_apicid, cpu); 301 else 302 return BAD_APICID; 303 } 304 305 static unsigned int 306 physflat_cpu_mask_to_apicid_and(const struct cpumask *cpumask, 307 const struct cpumask *andmask) 308 { 309 int cpu; 310 311 /* 312 * We're using fixed IRQ delivery, can only return one phys APIC ID. 313 * May as well be the first. 314 */ 315 for_each_cpu_and(cpu, cpumask, andmask) { 316 if (cpumask_test_cpu(cpu, cpu_online_mask)) 317 break; 318 } 319 return per_cpu(x86_cpu_to_apicid, cpu); 320 } 321 322 static int physflat_probe(void) 323 { 324 if (apic == &apic_physflat || num_possible_cpus() > 8) 325 return 1; 326 327 return 0; 328 } 329 330 static struct apic apic_physflat = { 331 332 .name = "physical flat", 333 .probe = physflat_probe, 334 .acpi_madt_oem_check = physflat_acpi_madt_oem_check, 335 .apic_id_registered = flat_apic_id_registered, 336 337 .irq_delivery_mode = dest_Fixed, 338 .irq_dest_mode = 0, /* physical */ 339 340 .target_cpus = physflat_target_cpus, 341 .disable_esr = 0, 342 .dest_logical = 0, 343 .check_apicid_used = NULL, 344 .check_apicid_present = NULL, 345 346 .vector_allocation_domain = physflat_vector_allocation_domain, 347 /* not needed, but shouldn't hurt: */ 348 .init_apic_ldr = flat_init_apic_ldr, 349 350 .ioapic_phys_id_map = NULL, 351 .setup_apic_routing = NULL, 352 .multi_timer_check = NULL, 353 .cpu_present_to_apicid = default_cpu_present_to_apicid, 354 .apicid_to_cpu_present = NULL, 355 .setup_portio_remap = NULL, 356 .check_phys_apicid_present = default_check_phys_apicid_present, 357 .enable_apic_mode = NULL, 358 .phys_pkg_id = flat_phys_pkg_id, 359 .mps_oem_check = NULL, 360 361 .get_apic_id = flat_get_apic_id, 362 .set_apic_id = set_apic_id, 363 .apic_id_mask = 0xFFu << 24, 364 365 .cpu_mask_to_apicid = physflat_cpu_mask_to_apicid, 366 .cpu_mask_to_apicid_and = physflat_cpu_mask_to_apicid_and, 367 368 .send_IPI_mask = physflat_send_IPI_mask, 369 .send_IPI_mask_allbutself = physflat_send_IPI_mask_allbutself, 370 .send_IPI_allbutself = physflat_send_IPI_allbutself, 371 .send_IPI_all = physflat_send_IPI_all, 372 .send_IPI_self = apic_send_IPI_self, 373 374 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW, 375 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH, 376 .wait_for_init_deassert = NULL, 377 .smp_callin_clear_local_apic = NULL, 378 .inquire_remote_apic = default_inquire_remote_apic, 379 380 .read = native_apic_mem_read, 381 .write = native_apic_mem_write, 382 .icr_read = native_apic_icr_read, 383 .icr_write = native_apic_icr_write, 384 .wait_icr_idle = native_apic_wait_icr_idle, 385 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 386 }; 387 388 /* 389 * We need to check for physflat first, so this order is important. 390 */ 391 apic_drivers(apic_physflat, apic_flat); 392