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   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
  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 unsigned int flat_cpu_mask_to_apicid(const struct cpumask *cpumask)
 163 {
 164         return cpumask_bits(cpumask)[0] & APIC_ALL_CPUS;
 165 }
 166
 167 static unsigned int flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 168                                                 const struct cpumask *andmask)
 169 {
 170         unsigned long mask1 = cpumask_bits(cpumask)[0] & APIC_ALL_CPUS;
 171         unsigned long mask2 = cpumask_bits(andmask)[0] & APIC_ALL_CPUS;
 172
 173         return mask1 & mask2;
 174 }
 175
 176 static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
 177 {
 178         return hard_smp_processor_id() >> index_msb;
 179 }
 180
 181 struct genapic apic_flat =  {
 182         .name                           = "flat",
 183         .probe                          = NULL,
 184         .acpi_madt_oem_check            = flat_acpi_madt_oem_check,
 185         .apic_id_registered             = flat_apic_id_registered,
 186
 187         .irq_delivery_mode              = dest_LowestPrio,
 188         .irq_dest_mode                  = 1, /* logical */
 189
 190         .target_cpus                    = flat_target_cpus,
 191         .disable_esr                    = 0,
 192         .dest_logical                   = APIC_DEST_LOGICAL,
 193         .check_apicid_used              = NULL,
 194         .check_apicid_present           = NULL,
 195
 196         .vector_allocation_domain       = flat_vector_allocation_domain,
 197         .init_apic_ldr                  = flat_init_apic_ldr,
 198
 199         .ioapic_phys_id_map             = NULL,
 200         .setup_apic_routing             = NULL,
 201         .multi_timer_check              = NULL,
 202         .apicid_to_node                 = NULL,
 203         .cpu_to_logical_apicid          = NULL,
 204         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 205         .apicid_to_cpu_present          = NULL,
 206         .setup_portio_remap             = NULL,
 207         .check_phys_apicid_present      = default_check_phys_apicid_present,
 208         .enable_apic_mode               = NULL,
 209         .phys_pkg_id                    = flat_phys_pkg_id,
 210         .mps_oem_check                  = NULL,
 211
 212         .get_apic_id                    = flat_get_apic_id,
 213         .set_apic_id                    = set_apic_id,
 214         .apic_id_mask                   = 0xFFu << 24,
 215
 216         .cpu_mask_to_apicid             = flat_cpu_mask_to_apicid,
 217         .cpu_mask_to_apicid_and         = flat_cpu_mask_to_apicid_and,
 218
 219         .send_IPI_mask                  = flat_send_IPI_mask,
 220         .send_IPI_mask_allbutself       = flat_send_IPI_mask_allbutself,
 221         .send_IPI_allbutself            = flat_send_IPI_allbutself,
 222         .send_IPI_all                   = flat_send_IPI_all,
 223         .send_IPI_self                  = apic_send_IPI_self,
 224
 225         .wakeup_cpu                     = NULL,
 226         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 227         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 228         .wait_for_init_deassert         = NULL,
 229         .smp_callin_clear_local_apic    = NULL,
 230         .store_NMI_vector               = NULL,
 231         .inquire_remote_apic            = NULL,
 232 };
 233
 234 /*
 235  * Physflat mode is used when there are more than 8 CPUs on a AMD system.
 236  * We cannot use logical delivery in this case because the mask
 237  * overflows, so use physical mode.
 238  */
 239 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 240 {
 241 #ifdef CONFIG_ACPI
 242         /*
 243          * Quirk: some x86_64 machines can only use physical APIC mode
 244          * regardless of how many processors are present (x86_64 ES7000
 245          * is an example).
 246          */
 247         if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
 248                 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
 249                 printk(KERN_DEBUG "system APIC only can use physical flat");
 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         if (cpu < nr_cpu_ids)
 319                 return per_cpu(x86_cpu_to_apicid, cpu);
 320
 321         return BAD_APICID;
 322 }
 323
 324 struct genapic apic_physflat =  {
 325
 326         .name                           = "physical flat",
 327         .probe                          = NULL,
 328         .acpi_madt_oem_check            = physflat_acpi_madt_oem_check,
 329         .apic_id_registered             = flat_apic_id_registered,
 330
 331         .irq_delivery_mode              = dest_Fixed,
 332         .irq_dest_mode                  = 0, /* physical */
 333
 334         .target_cpus                    = physflat_target_cpus,
 335         .disable_esr                    = 0,
 336         .dest_logical                   = 0,
 337         .check_apicid_used              = NULL,
 338         .check_apicid_present           = NULL,
 339
 340         .vector_allocation_domain       = physflat_vector_allocation_domain,
 341         /* not needed, but shouldn't hurt: */
 342         .init_apic_ldr                  = flat_init_apic_ldr,
 343
 344         .ioapic_phys_id_map             = NULL,
 345         .setup_apic_routing             = NULL,
 346         .multi_timer_check              = NULL,
 347         .apicid_to_node                 = NULL,
 348         .cpu_to_logical_apicid          = NULL,
 349         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 350         .apicid_to_cpu_present          = NULL,
 351         .setup_portio_remap             = NULL,
 352         .check_phys_apicid_present      = default_check_phys_apicid_present,
 353         .enable_apic_mode               = NULL,
 354         .phys_pkg_id                    = flat_phys_pkg_id,
 355         .mps_oem_check                  = NULL,
 356
 357         .get_apic_id                    = flat_get_apic_id,
 358         .set_apic_id                    = set_apic_id,
 359         .apic_id_mask                   = 0xFFu << 24,
 360
 361         .cpu_mask_to_apicid             = physflat_cpu_mask_to_apicid,
 362         .cpu_mask_to_apicid_and         = physflat_cpu_mask_to_apicid_and,
 363
 364         .send_IPI_mask                  = physflat_send_IPI_mask,
 365         .send_IPI_mask_allbutself       = physflat_send_IPI_mask_allbutself,
 366         .send_IPI_allbutself            = physflat_send_IPI_allbutself,
 367         .send_IPI_all                   = physflat_send_IPI_all,
 368         .send_IPI_self                  = apic_send_IPI_self,
 369
 370         .wakeup_cpu                     = NULL,
 371         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 372         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 373         .wait_for_init_deassert         = NULL,
 374         .smp_callin_clear_local_apic    = NULL,
 375         .store_NMI_vector               = NULL,
 376         .inquire_remote_apic            = NULL,
 377 };