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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 #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 get_apic_id(unsigned long x)
 130 {
 131         unsigned int id;
 132
 133         id = (((x)>>24) & 0xFFu);
 134         return id;
 135 }
 136
 137 static unsigned long set_apic_id(unsigned int id)
 138 {
 139         unsigned long x;
 140
 141         x = ((id & 0xFFu)<<24);
 142         return x;
 143 }
 144
 145 static unsigned int read_xapic_id(void)
 146 {
 147         unsigned int id;
 148
 149         id = get_apic_id(apic_read(APIC_ID));
 150         return id;
 151 }
 152
 153 static int flat_apic_id_registered(void)
 154 {
 155         return physid_isset(read_xapic_id(), phys_cpu_present_map);
 156 }
 157
 158 static unsigned int flat_cpu_mask_to_apicid(const struct cpumask *cpumask)
 159 {
 160         return cpumask_bits(cpumask)[0] & APIC_ALL_CPUS;
 161 }
 162
 163 static unsigned int flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 164                                                 const struct cpumask *andmask)
 165 {
 166         unsigned long mask1 = cpumask_bits(cpumask)[0] & APIC_ALL_CPUS;
 167         unsigned long mask2 = cpumask_bits(andmask)[0] & APIC_ALL_CPUS;
 168
 169         return mask1 & mask2;
 170 }
 171
 172 static unsigned int phys_pkg_id(int index_msb)
 173 {
 174         return hard_smp_processor_id() >> index_msb;
 175 }
 176
 177 struct genapic apic_flat =  {
 178         .name                           = "flat",
 179         .probe                          = NULL,
 180         .acpi_madt_oem_check            = flat_acpi_madt_oem_check,
 181         .apic_id_registered             = flat_apic_id_registered,
 182
 183         .int_delivery_mode              = dest_LowestPrio,
 184         .int_dest_mode                  = (APIC_DEST_LOGICAL != 0),
 185
 186         .target_cpus                    = flat_target_cpus,
 187         .ESR_DISABLE                    = 0,
 188         .apic_destination_logical       = 0,
 189         .check_apicid_used              = NULL,
 190         .check_apicid_present           = NULL,
 191
 192         .no_balance_irq                 = 0,
 193         .no_ioapic_check                = 0,
 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         .apicid_to_node                 = NULL,
 202         .cpu_to_logical_apicid          = NULL,
 203         .cpu_present_to_apicid          = NULL,
 204         .apicid_to_cpu_present          = NULL,
 205         .setup_portio_remap             = NULL,
 206         .check_phys_apicid_present      = NULL,
 207         .enable_apic_mode               = NULL,
 208         .phys_pkg_id                    = phys_pkg_id,
 209         .mps_oem_check                  = NULL,
 210
 211         .get_apic_id                    = get_apic_id,
 212         .set_apic_id                    = set_apic_id,
 213         .apic_id_mask                   = 0xFFu << 24,
 214
 215         .cpu_mask_to_apicid             = flat_cpu_mask_to_apicid,
 216         .cpu_mask_to_apicid_and         = flat_cpu_mask_to_apicid_and,
 217
 218         .send_IPI_mask                  = flat_send_IPI_mask,
 219         .send_IPI_mask_allbutself       = flat_send_IPI_mask_allbutself,
 220         .send_IPI_allbutself            = flat_send_IPI_allbutself,
 221         .send_IPI_all                   = flat_send_IPI_all,
 222         .send_IPI_self                  = apic_send_IPI_self,
 223
 224         .wakeup_cpu                     = NULL,
 225         .trampoline_phys_low            = 0,
 226         .trampoline_phys_high           = 0,
 227         .wait_for_init_deassert         = NULL,
 228         .smp_callin_clear_local_apic    = NULL,
 229         .store_NMI_vector               = NULL,
 230         .restore_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         send_IPI_mask_sequence(cpumask, vector);
 271 }
 272
 273 static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
 274                                               int vector)
 275 {
 276         send_IPI_mask_allbutself(cpumask, vector);
 277 }
 278
 279 static void physflat_send_IPI_allbutself(int vector)
 280 {
 281         send_IPI_mask_allbutself(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         if (cpu < nr_cpu_ids)
 318                 return per_cpu(x86_cpu_to_apicid, cpu);
 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         .int_delivery_mode              = dest_Fixed,
 330         .int_dest_mode                  = (APIC_DEST_PHYSICAL != 0),
 331
 332         .target_cpus                    = physflat_target_cpus,
 333         .ESR_DISABLE                    = 0,
 334         .apic_destination_logical       = 0,
 335         .check_apicid_used              = NULL,
 336         .check_apicid_present           = NULL,
 337
 338         .no_balance_irq                 = 0,
 339         .no_ioapic_check                = 0,
 340
 341         .vector_allocation_domain       = physflat_vector_allocation_domain,
 342         /* not needed, but shouldn't hurt: */
 343         .init_apic_ldr                  = flat_init_apic_ldr,
 344
 345         .ioapic_phys_id_map             = NULL,
 346         .setup_apic_routing             = NULL,
 347         .multi_timer_check              = NULL,
 348         .apicid_to_node                 = NULL,
 349         .cpu_to_logical_apicid          = NULL,
 350         .cpu_present_to_apicid          = NULL,
 351         .apicid_to_cpu_present          = NULL,
 352         .setup_portio_remap             = NULL,
 353         .check_phys_apicid_present      = NULL,
 354         .enable_apic_mode               = NULL,
 355         .phys_pkg_id                    = phys_pkg_id,
 356         .mps_oem_check                  = NULL,
 357
 358         .get_apic_id                    = get_apic_id,
 359         .set_apic_id                    = set_apic_id,
 360         .apic_id_mask                   = 0xFFu<<24,
 361
 362         .cpu_mask_to_apicid             = physflat_cpu_mask_to_apicid,
 363         .cpu_mask_to_apicid_and         = physflat_cpu_mask_to_apicid_and,
 364
 365         .send_IPI_mask                  = physflat_send_IPI_mask,
 366         .send_IPI_mask_allbutself       = physflat_send_IPI_mask_allbutself,
 367         .send_IPI_allbutself            = physflat_send_IPI_allbutself,
 368         .send_IPI_all                   = physflat_send_IPI_all,
 369         .send_IPI_self                  = apic_send_IPI_self,
 370
 371         .wakeup_cpu                     = NULL,
 372         .trampoline_phys_low            = 0,
 373         .trampoline_phys_high           = 0,
 374         .wait_for_init_deassert         = NULL,
 375         .smp_callin_clear_local_apic    = NULL,
 376         .store_NMI_vector               = NULL,
 377         .restore_NMI_vector             = NULL,
 378         .inquire_remote_apic            = NULL,
 379 };