arch/x86/kernel/apic/apic_flat_64.c

   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_valid                  = default_apic_id_valid,
 184         .apic_id_registered             = flat_apic_id_registered,
 185
 186         .irq_delivery_mode              = dest_LowestPrio,
 187         .irq_dest_mode                  = 1, /* logical */
 188
 189         .target_cpus                    = flat_target_cpus,
 190         .disable_esr                    = 0,
 191         .dest_logical                   = APIC_DEST_LOGICAL,
 192         .check_apicid_used              = NULL,
 193         .check_apicid_present           = NULL,
 194
 195         .vector_allocation_domain       = flat_vector_allocation_domain,
 196         .init_apic_ldr                  = flat_init_apic_ldr,
 197
 198         .ioapic_phys_id_map             = NULL,
 199         .setup_apic_routing             = NULL,
 200         .multi_timer_check              = NULL,
 201         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 202         .apicid_to_cpu_present          = NULL,
 203         .setup_portio_remap             = NULL,
 204         .check_phys_apicid_present      = default_check_phys_apicid_present,
 205         .enable_apic_mode               = NULL,
 206         .phys_pkg_id                    = flat_phys_pkg_id,
 207         .mps_oem_check                  = NULL,
 208
 209         .get_apic_id                    = flat_get_apic_id,
 210         .set_apic_id                    = set_apic_id,
 211         .apic_id_mask                   = 0xFFu << 24,
 212
 213         .cpu_mask_to_apicid             = default_cpu_mask_to_apicid,
 214         .cpu_mask_to_apicid_and         = default_cpu_mask_to_apicid_and,
 215
 216         .send_IPI_mask                  = flat_send_IPI_mask,
 217         .send_IPI_mask_allbutself       = flat_send_IPI_mask_allbutself,
 218         .send_IPI_allbutself            = flat_send_IPI_allbutself,
 219         .send_IPI_all                   = flat_send_IPI_all,
 220         .send_IPI_self                  = apic_send_IPI_self,
 221
 222         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 223         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 224         .wait_for_init_deassert         = NULL,
 225         .smp_callin_clear_local_apic    = NULL,
 226         .inquire_remote_apic            = default_inquire_remote_apic,
 227
 228         .read                           = native_apic_mem_read,
 229         .write                          = native_apic_mem_write,
 230         .eoi_write                      = native_apic_mem_write,
 231         .icr_read                       = native_apic_icr_read,
 232         .icr_write                      = native_apic_icr_write,
 233         .wait_icr_idle                  = native_apic_wait_icr_idle,
 234         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 235 };
 236
 237 /*
 238  * Physflat mode is used when there are more than 8 CPUs on a system.
 239  * We cannot use logical delivery in this case because the mask
 240  * overflows, so use physical mode.
 241  */
 242 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 243 {
 244 #ifdef CONFIG_ACPI
 245         /*
 246          * Quirk: some x86_64 machines can only use physical APIC mode
 247          * regardless of how many processors are present (x86_64 ES7000
 248          * is an example).
 249          */
 250         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
 251                 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
 252                 printk(KERN_DEBUG "system APIC only can use physical flat");
 253                 return 1;
 254         }
 255
 256         if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
 257                 printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
 258                 return 1;
 259         }
 260 #endif
 261
 262         return 0;
 263 }
 264
 265 static const struct cpumask *physflat_target_cpus(void)
 266 {
 267         return cpu_online_mask;
 268 }
 269
 270 static void physflat_vector_allocation_domain(int cpu, struct cpumask *retmask)
 271 {
 272         cpumask_clear(retmask);
 273         cpumask_set_cpu(cpu, retmask);
 274 }
 275
 276 static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
 277 {
 278         default_send_IPI_mask_sequence_phys(cpumask, vector);
 279 }
 280
 281 static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
 282                                               int vector)
 283 {
 284         default_send_IPI_mask_allbutself_phys(cpumask, vector);
 285 }
 286
 287 static void physflat_send_IPI_allbutself(int vector)
 288 {
 289         default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
 290 }
 291
 292 static void physflat_send_IPI_all(int vector)
 293 {
 294         physflat_send_IPI_mask(cpu_online_mask, vector);
 295 }
 296
 297 static unsigned int physflat_cpu_mask_to_apicid(const struct cpumask *cpumask)
 298 {
 299         int cpu;
 300
 301         /*
 302          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 303          * May as well be the first.
 304          */
 305         cpu = cpumask_first(cpumask);
 306         if ((unsigned)cpu < nr_cpu_ids)
 307                 return per_cpu(x86_cpu_to_apicid, cpu);
 308         else
 309                 return BAD_APICID;
 310 }
 311
 312 static unsigned int
 313 physflat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 314                                 const struct cpumask *andmask)
 315 {
 316         int cpu;
 317
 318         /*
 319          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 320          * May as well be the first.
 321          */
 322         for_each_cpu_and(cpu, cpumask, andmask) {
 323                 if (cpumask_test_cpu(cpu, cpu_online_mask))
 324                         break;
 325         }
 326         return per_cpu(x86_cpu_to_apicid, cpu);
 327 }
 328
 329 static int physflat_probe(void)
 330 {
 331         if (apic == &apic_physflat || num_possible_cpus() > 8)
 332                 return 1;
 333
 334         return 0;
 335 }
 336
 337 static struct apic apic_physflat =  {
 338
 339         .name                           = "physical flat",
 340         .probe                          = physflat_probe,
 341         .acpi_madt_oem_check            = physflat_acpi_madt_oem_check,
 342         .apic_id_valid                  = default_apic_id_valid,
 343         .apic_id_registered             = flat_apic_id_registered,
 344
 345         .irq_delivery_mode              = dest_Fixed,
 346         .irq_dest_mode                  = 0, /* physical */
 347
 348         .target_cpus                    = physflat_target_cpus,
 349         .disable_esr                    = 0,
 350         .dest_logical                   = 0,
 351         .check_apicid_used              = NULL,
 352         .check_apicid_present           = NULL,
 353
 354         .vector_allocation_domain       = physflat_vector_allocation_domain,
 355         /* not needed, but shouldn't hurt: */
 356         .init_apic_ldr                  = flat_init_apic_ldr,
 357
 358         .ioapic_phys_id_map             = NULL,
 359         .setup_apic_routing             = NULL,
 360         .multi_timer_check              = NULL,
 361         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 362         .apicid_to_cpu_present          = NULL,
 363         .setup_portio_remap             = NULL,
 364         .check_phys_apicid_present      = default_check_phys_apicid_present,
 365         .enable_apic_mode               = NULL,
 366         .phys_pkg_id                    = flat_phys_pkg_id,
 367         .mps_oem_check                  = NULL,
 368
 369         .get_apic_id                    = flat_get_apic_id,
 370         .set_apic_id                    = set_apic_id,
 371         .apic_id_mask                   = 0xFFu << 24,
 372
 373         .cpu_mask_to_apicid             = physflat_cpu_mask_to_apicid,
 374         .cpu_mask_to_apicid_and         = physflat_cpu_mask_to_apicid_and,
 375
 376         .send_IPI_mask                  = physflat_send_IPI_mask,
 377         .send_IPI_mask_allbutself       = physflat_send_IPI_mask_allbutself,
 378         .send_IPI_allbutself            = physflat_send_IPI_allbutself,
 379         .send_IPI_all                   = physflat_send_IPI_all,
 380         .send_IPI_self                  = apic_send_IPI_self,
 381
 382         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 383         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 384         .wait_for_init_deassert         = NULL,
 385         .smp_callin_clear_local_apic    = NULL,
 386         .inquire_remote_apic            = default_inquire_remote_apic,
 387
 388         .read                           = native_apic_mem_read,
 389         .write                          = native_apic_mem_write,
 390         .eoi_write                      = native_apic_mem_write,
 391         .icr_read                       = native_apic_icr_read,
 392         .icr_write                      = native_apic_icr_write,
 393         .wait_icr_idle                  = native_apic_wait_icr_idle,
 394         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 395 };
 396
 397 /*
 398  * We need to check for physflat first, so this order is important.
 399  */
 400 apic_drivers(apic_physflat, apic_flat);