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