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