arch/x86/kernel/genapic_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/ipi.h>
  21 #include <asm/genapic.h>
  22 #include <mach_apicdef.h>
  23
  24 #ifdef CONFIG_ACPI
  25 #include <acpi/acpi_bus.h>
  26 #endif
  27
  28 static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  29 {
  30         return 1;
  31 }
  32
  33 static const struct cpumask *flat_target_cpus(void)
  34 {
  35         return cpu_online_mask;
  36 }
  37
  38 static void flat_vector_allocation_domain(int cpu, struct cpumask *retmask)
  39 {
  40         /* Careful. Some cpus do not strictly honor the set of cpus
  41          * specified in the interrupt destination when using lowest
  42          * priority interrupt delivery mode.
  43          *
  44          * In particular there was a hyperthreading cpu observed to
  45          * deliver interrupts to the wrong hyperthread when only one
  46          * hyperthread was specified in the interrupt desitination.
  47          */
  48         cpumask_clear(retmask);
  49         cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
  50 }
  51
  52 /*
  53  * Set up the logical destination ID.
  54  *
  55  * Intel recommends to set DFR, LDR and TPR before enabling
  56  * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
  57  * document number 292116).  So here it goes...
  58  */
  59 static void flat_init_apic_ldr(void)
  60 {
  61         unsigned long val;
  62         unsigned long num, id;
  63
  64         num = smp_processor_id();
  65         id = 1UL << num;
  66         apic_write(APIC_DFR, APIC_DFR_FLAT);
  67         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
  68         val |= SET_APIC_LOGICAL_ID(id);
  69         apic_write(APIC_LDR, val);
  70 }
  71
  72 static inline void _flat_send_IPI_mask(unsigned long mask, int vector)
  73 {
  74         unsigned long flags;
  75
  76         local_irq_save(flags);
  77         __send_IPI_dest_field(mask, vector, apic->dest_logical);
  78         local_irq_restore(flags);
  79 }
  80
  81 static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
  82 {
  83         unsigned long mask = cpumask_bits(cpumask)[0];
  84
  85         _flat_send_IPI_mask(mask, vector);
  86 }
  87
  88 static void flat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
  89                                           int vector)
  90 {
  91         unsigned long mask = cpumask_bits(cpumask)[0];
  92         int cpu = smp_processor_id();
  93
  94         if (cpu < BITS_PER_LONG)
  95                 clear_bit(cpu, &mask);
  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                 __send_IPI_shortcut(APIC_DEST_ALLBUT, vector, apic->dest_logical);
 118         }
 119 }
 120
 121 static void flat_send_IPI_all(int vector)
 122 {
 123         if (vector == NMI_VECTOR)
 124                 flat_send_IPI_mask(cpu_online_mask, vector);
 125         else
 126                 __send_IPI_shortcut(APIC_DEST_ALLINC, vector, apic->dest_logical);
 127 }
 128
 129 static unsigned int flat_get_apic_id(unsigned long x)
 130 {
 131         unsigned int id;
 132
 133         id = (((x)>>24) & 0xFFu);
 134
 135         return id;
 136 }
 137
 138 static unsigned long set_apic_id(unsigned int id)
 139 {
 140         unsigned long x;
 141
 142         x = ((id & 0xFFu)<<24);
 143         return x;
 144 }
 145
 146 static unsigned int read_xapic_id(void)
 147 {
 148         unsigned int id;
 149
 150         id = flat_get_apic_id(apic_read(APIC_ID));
 151         return id;
 152 }
 153
 154 static int flat_apic_id_registered(void)
 155 {
 156         return physid_isset(read_xapic_id(), phys_cpu_present_map);
 157 }
 158
 159 static unsigned int flat_cpu_mask_to_apicid(const struct cpumask *cpumask)
 160 {
 161         return cpumask_bits(cpumask)[0] & APIC_ALL_CPUS;
 162 }
 163
 164 static unsigned int flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 165                                                 const struct cpumask *andmask)
 166 {
 167         unsigned long mask1 = cpumask_bits(cpumask)[0] & APIC_ALL_CPUS;
 168         unsigned long mask2 = cpumask_bits(andmask)[0] & APIC_ALL_CPUS;
 169
 170         return mask1 & mask2;
 171 }
 172
 173 static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
 174 {
 175         return hard_smp_processor_id() >> index_msb;
 176 }
 177
 178 struct genapic apic_flat =  {
 179         .name                           = "flat",
 180         .probe                          = NULL,
 181         .acpi_madt_oem_check            = flat_acpi_madt_oem_check,
 182         .apic_id_registered             = flat_apic_id_registered,
 183
 184         .irq_delivery_mode              = dest_LowestPrio,
 185         .irq_dest_mode                  = 1, /* logical */
 186
 187         .target_cpus                    = flat_target_cpus,
 188         .disable_esr                    = 0,
 189         .dest_logical                   = APIC_DEST_LOGICAL,
 190         .check_apicid_used              = NULL,
 191         .check_apicid_present           = NULL,
 192
 193         .vector_allocation_domain       = flat_vector_allocation_domain,
 194         .init_apic_ldr                  = flat_init_apic_ldr,
 195
 196         .ioapic_phys_id_map             = NULL,
 197         .setup_apic_routing             = NULL,
 198         .multi_timer_check              = NULL,
 199         .apicid_to_node                 = NULL,
 200         .cpu_to_logical_apicid          = 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             = flat_cpu_mask_to_apicid,
 214         .cpu_mask_to_apicid_and         = flat_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         .wakeup_cpu                     = NULL,
 223         .trampoline_phys_low            = 0,
 224         .trampoline_phys_high           = 0,
 225         .wait_for_init_deassert         = NULL,
 226         .smp_callin_clear_local_apic    = NULL,
 227         .store_NMI_vector               = NULL,
 228         .restore_NMI_vector             = NULL,
 229         .inquire_remote_apic            = NULL,
 230 };
 231
 232 /*
 233  * Physflat mode is used when there are more than 8 CPUs on a AMD system.
 234  * We cannot use logical delivery in this case because the mask
 235  * overflows, so use physical mode.
 236  */
 237 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 238 {
 239 #ifdef CONFIG_ACPI
 240         /*
 241          * Quirk: some x86_64 machines can only use physical APIC mode
 242          * regardless of how many processors are present (x86_64 ES7000
 243          * is an example).
 244          */
 245         if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
 246                 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
 247                 printk(KERN_DEBUG "system APIC only can use physical flat");
 248                 return 1;
 249         }
 250 #endif
 251
 252         return 0;
 253 }
 254
 255 static const struct cpumask *physflat_target_cpus(void)
 256 {
 257         return cpu_online_mask;
 258 }
 259
 260 static void physflat_vector_allocation_domain(int cpu, struct cpumask *retmask)
 261 {
 262         cpumask_clear(retmask);
 263         cpumask_set_cpu(cpu, retmask);
 264 }
 265
 266 static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
 267 {
 268         send_IPI_mask_sequence(cpumask, vector);
 269 }
 270
 271 static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
 272                                               int vector)
 273 {
 274         send_IPI_mask_allbutself(cpumask, vector);
 275 }
 276
 277 static void physflat_send_IPI_allbutself(int vector)
 278 {
 279         send_IPI_mask_allbutself(cpu_online_mask, vector);
 280 }
 281
 282 static void physflat_send_IPI_all(int vector)
 283 {
 284         physflat_send_IPI_mask(cpu_online_mask, vector);
 285 }
 286
 287 static unsigned int physflat_cpu_mask_to_apicid(const struct cpumask *cpumask)
 288 {
 289         int cpu;
 290
 291         /*
 292          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 293          * May as well be the first.
 294          */
 295         cpu = cpumask_first(cpumask);
 296         if ((unsigned)cpu < nr_cpu_ids)
 297                 return per_cpu(x86_cpu_to_apicid, cpu);
 298         else
 299                 return BAD_APICID;
 300 }
 301
 302 static unsigned int
 303 physflat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 304                                 const struct cpumask *andmask)
 305 {
 306         int cpu;
 307
 308         /*
 309          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 310          * May as well be the first.
 311          */
 312         for_each_cpu_and(cpu, cpumask, andmask) {
 313                 if (cpumask_test_cpu(cpu, cpu_online_mask))
 314                         break;
 315         }
 316         if (cpu < nr_cpu_ids)
 317                 return per_cpu(x86_cpu_to_apicid, cpu);
 318
 319         return BAD_APICID;
 320 }
 321
 322 struct genapic apic_physflat =  {
 323
 324         .name                           = "physical flat",
 325         .probe                          = NULL,
 326         .acpi_madt_oem_check            = physflat_acpi_madt_oem_check,
 327         .apic_id_registered             = flat_apic_id_registered,
 328
 329         .irq_delivery_mode              = dest_Fixed,
 330         .irq_dest_mode                  = 0, /* physical */
 331
 332         .target_cpus                    = physflat_target_cpus,
 333         .disable_esr                    = 0,
 334         .dest_logical                   = 0,
 335         .check_apicid_used              = NULL,
 336         .check_apicid_present           = NULL,
 337
 338         .vector_allocation_domain       = physflat_vector_allocation_domain,
 339         /* not needed, but shouldn't hurt: */
 340         .init_apic_ldr                  = flat_init_apic_ldr,
 341
 342         .ioapic_phys_id_map             = NULL,
 343         .setup_apic_routing             = NULL,
 344         .multi_timer_check              = NULL,
 345         .apicid_to_node                 = NULL,
 346         .cpu_to_logical_apicid          = NULL,
 347         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 348         .apicid_to_cpu_present          = NULL,
 349         .setup_portio_remap             = NULL,
 350         .check_phys_apicid_present      = default_check_phys_apicid_present,
 351         .enable_apic_mode               = NULL,
 352         .phys_pkg_id                    = flat_phys_pkg_id,
 353         .mps_oem_check                  = NULL,
 354
 355         .get_apic_id                    = flat_get_apic_id,
 356         .set_apic_id                    = set_apic_id,
 357         .apic_id_mask                   = 0xFFu << 24,
 358
 359         .cpu_mask_to_apicid             = physflat_cpu_mask_to_apicid,
 360         .cpu_mask_to_apicid_and         = physflat_cpu_mask_to_apicid_and,
 361
 362         .send_IPI_mask                  = physflat_send_IPI_mask,
 363         .send_IPI_mask_allbutself       = physflat_send_IPI_mask_allbutself,
 364         .send_IPI_allbutself            = physflat_send_IPI_allbutself,
 365         .send_IPI_all                   = physflat_send_IPI_all,
 366         .send_IPI_self                  = apic_send_IPI_self,
 367
 368         .wakeup_cpu                     = NULL,
 369         .trampoline_phys_low            = 0,
 370         .trampoline_phys_high           = 0,
 371         .wait_for_init_deassert         = NULL,
 372         .smp_callin_clear_local_apic    = NULL,
 373         .store_NMI_vector               = NULL,
 374         .restore_NMI_vector             = NULL,
 375         .inquire_remote_apic            = NULL,
 376 };