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 int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  28 {
  29         return 1;
  30 }
  31
  32 static const struct cpumask *flat_target_cpus(void)
  33 {
  34         return cpu_online_mask;
  35 }
  36
  37 static 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  */
  58 static 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
  71 static 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
  80 static 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
  87 static 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
  99 static 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
 122 static 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
 132 static 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
 141 static unsigned long set_apic_id(unsigned int id)
 142 {
 143         unsigned long x;
 144
 145         x = ((id & 0xFFu)<<24);
 146         return x;
 147 }
 148
 149 static 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
 157 static int flat_apic_id_registered(void)
 158 {
 159         return physid_isset(read_xapic_id(), phys_cpu_present_map);
 160 }
 161
 162 static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
 163 {
 164         return initial_apic_id >> index_msb;
 165 }
 166
 167 struct 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         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 189         .apicid_to_cpu_present          = NULL,
 190         .setup_portio_remap             = NULL,
 191         .check_phys_apicid_present      = default_check_phys_apicid_present,
 192         .enable_apic_mode               = NULL,
 193         .phys_pkg_id                    = flat_phys_pkg_id,
 194         .mps_oem_check                  = NULL,
 195
 196         .get_apic_id                    = flat_get_apic_id,
 197         .set_apic_id                    = set_apic_id,
 198         .apic_id_mask                   = 0xFFu << 24,
 199
 200         .cpu_mask_to_apicid             = default_cpu_mask_to_apicid,
 201         .cpu_mask_to_apicid_and         = default_cpu_mask_to_apicid_and,
 202
 203         .send_IPI_mask                  = flat_send_IPI_mask,
 204         .send_IPI_mask_allbutself       = flat_send_IPI_mask_allbutself,
 205         .send_IPI_allbutself            = flat_send_IPI_allbutself,
 206         .send_IPI_all                   = flat_send_IPI_all,
 207         .send_IPI_self                  = apic_send_IPI_self,
 208
 209         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 210         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 211         .wait_for_init_deassert         = NULL,
 212         .smp_callin_clear_local_apic    = NULL,
 213         .inquire_remote_apic            = default_inquire_remote_apic,
 214
 215         .read                           = native_apic_mem_read,
 216         .write                          = native_apic_mem_write,
 217         .icr_read                       = native_apic_icr_read,
 218         .icr_write                      = native_apic_icr_write,
 219         .wait_icr_idle                  = native_apic_wait_icr_idle,
 220         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 221 };
 222
 223 /*
 224  * Physflat mode is used when there are more than 8 CPUs on a system.
 225  * We cannot use logical delivery in this case because the mask
 226  * overflows, so use physical mode.
 227  */
 228 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 229 {
 230 #ifdef CONFIG_ACPI
 231         /*
 232          * Quirk: some x86_64 machines can only use physical APIC mode
 233          * regardless of how many processors are present (x86_64 ES7000
 234          * is an example).
 235          */
 236         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
 237                 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
 238                 printk(KERN_DEBUG "system APIC only can use physical flat");
 239                 return 1;
 240         }
 241
 242         if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
 243                 printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
 244                 return 1;
 245         }
 246 #endif
 247
 248         return 0;
 249 }
 250
 251 static const struct cpumask *physflat_target_cpus(void)
 252 {
 253         return cpu_online_mask;
 254 }
 255
 256 static void physflat_vector_allocation_domain(int cpu, struct cpumask *retmask)
 257 {
 258         cpumask_clear(retmask);
 259         cpumask_set_cpu(cpu, retmask);
 260 }
 261
 262 static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
 263 {
 264         default_send_IPI_mask_sequence_phys(cpumask, vector);
 265 }
 266
 267 static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
 268                                               int vector)
 269 {
 270         default_send_IPI_mask_allbutself_phys(cpumask, vector);
 271 }
 272
 273 static void physflat_send_IPI_allbutself(int vector)
 274 {
 275         default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
 276 }
 277
 278 static void physflat_send_IPI_all(int vector)
 279 {
 280         physflat_send_IPI_mask(cpu_online_mask, vector);
 281 }
 282
 283 static unsigned int physflat_cpu_mask_to_apicid(const struct cpumask *cpumask)
 284 {
 285         int cpu;
 286
 287         /*
 288          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 289          * May as well be the first.
 290          */
 291         cpu = cpumask_first(cpumask);
 292         if ((unsigned)cpu < nr_cpu_ids)
 293                 return per_cpu(x86_cpu_to_apicid, cpu);
 294         else
 295                 return BAD_APICID;
 296 }
 297
 298 static unsigned int
 299 physflat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 300                                 const struct cpumask *andmask)
 301 {
 302         int cpu;
 303
 304         /*
 305          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 306          * May as well be the first.
 307          */
 308         for_each_cpu_and(cpu, cpumask, andmask) {
 309                 if (cpumask_test_cpu(cpu, cpu_online_mask))
 310                         break;
 311         }
 312         return per_cpu(x86_cpu_to_apicid, cpu);
 313 }
 314
 315 struct apic apic_physflat =  {
 316
 317         .name                           = "physical flat",
 318         .probe                          = NULL,
 319         .acpi_madt_oem_check            = physflat_acpi_madt_oem_check,
 320         .apic_id_registered             = flat_apic_id_registered,
 321
 322         .irq_delivery_mode              = dest_Fixed,
 323         .irq_dest_mode                  = 0, /* physical */
 324
 325         .target_cpus                    = physflat_target_cpus,
 326         .disable_esr                    = 0,
 327         .dest_logical                   = 0,
 328         .check_apicid_used              = NULL,
 329         .check_apicid_present           = NULL,
 330
 331         .vector_allocation_domain       = physflat_vector_allocation_domain,
 332         /* not needed, but shouldn't hurt: */
 333         .init_apic_ldr                  = flat_init_apic_ldr,
 334
 335         .ioapic_phys_id_map             = NULL,
 336         .setup_apic_routing             = NULL,
 337         .multi_timer_check              = NULL,
 338         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 339         .apicid_to_cpu_present          = NULL,
 340         .setup_portio_remap             = NULL,
 341         .check_phys_apicid_present      = default_check_phys_apicid_present,
 342         .enable_apic_mode               = NULL,
 343         .phys_pkg_id                    = flat_phys_pkg_id,
 344         .mps_oem_check                  = NULL,
 345
 346         .get_apic_id                    = flat_get_apic_id,
 347         .set_apic_id                    = set_apic_id,
 348         .apic_id_mask                   = 0xFFu << 24,
 349
 350         .cpu_mask_to_apicid             = physflat_cpu_mask_to_apicid,
 351         .cpu_mask_to_apicid_and         = physflat_cpu_mask_to_apicid_and,
 352
 353         .send_IPI_mask                  = physflat_send_IPI_mask,
 354         .send_IPI_mask_allbutself       = physflat_send_IPI_mask_allbutself,
 355         .send_IPI_allbutself            = physflat_send_IPI_allbutself,
 356         .send_IPI_all                   = physflat_send_IPI_all,
 357         .send_IPI_self                  = apic_send_IPI_self,
 358
 359         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 360         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 361         .wait_for_init_deassert         = NULL,
 362         .smp_callin_clear_local_apic    = NULL,
 363         .inquire_remote_apic            = default_inquire_remote_apic,
 364
 365         .read                           = native_apic_mem_read,
 366         .write                          = native_apic_mem_write,
 367         .icr_read                       = native_apic_icr_read,
 368         .icr_write                      = native_apic_icr_write,
 369         .wait_icr_idle                  = native_apic_wait_icr_idle,
 370         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 371 };