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 <linux/module.h>
  20 #include <asm/smp.h>
  21 #include <asm/apic.h>
  22 #include <asm/ipi.h>
  23
  24 #ifdef CONFIG_ACPI
  25 #include <acpi/acpi_bus.h>
  26 #endif
  27
  28 static struct apic apic_physflat;
  29 static struct apic apic_flat;
  30
  31 struct apic __read_mostly *apic = &apic_flat;
  32 EXPORT_SYMBOL_GPL(apic);
  33
  34 static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  35 {
  36         return 1;
  37 }
  38
  39 /*
  40  * Set up the logical destination ID.
  41  *
  42  * Intel recommends to set DFR, LDR and TPR before enabling
  43  * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
  44  * document number 292116).  So here it goes...
  45  */
  46 void flat_init_apic_ldr(void)
  47 {
  48         unsigned long val;
  49         unsigned long num, id;
  50
  51         num = smp_processor_id();
  52         id = 1UL << num;
  53         apic_write(APIC_DFR, APIC_DFR_FLAT);
  54         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
  55         val |= SET_APIC_LOGICAL_ID(id);
  56         apic_write(APIC_LDR, val);
  57 }
  58
  59 static inline void _flat_send_IPI_mask(unsigned long mask, int vector)
  60 {
  61         unsigned long flags;
  62
  63         local_irq_save(flags);
  64         __default_send_IPI_dest_field(mask, vector, apic->dest_logical);
  65         local_irq_restore(flags);
  66 }
  67
  68 static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
  69 {
  70         unsigned long mask = cpumask_bits(cpumask)[0];
  71
  72         _flat_send_IPI_mask(mask, vector);
  73 }
  74
  75 static void
  76 flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
  77 {
  78         unsigned long mask = cpumask_bits(cpumask)[0];
  79         int cpu = smp_processor_id();
  80
  81         if (cpu < BITS_PER_LONG)
  82                 clear_bit(cpu, &mask);
  83
  84         _flat_send_IPI_mask(mask, vector);
  85 }
  86
  87 static void flat_send_IPI_allbutself(int vector)
  88 {
  89         int cpu = smp_processor_id();
  90 #ifdef  CONFIG_HOTPLUG_CPU
  91         int hotplug = 1;
  92 #else
  93         int hotplug = 0;
  94 #endif
  95         if (hotplug || vector == NMI_VECTOR) {
  96                 if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) {
  97                         unsigned long mask = cpumask_bits(cpu_online_mask)[0];
  98
  99                         if (cpu < BITS_PER_LONG)
 100                                 clear_bit(cpu, &mask);
 101
 102                         _flat_send_IPI_mask(mask, vector);
 103                 }
 104         } else if (num_online_cpus() > 1) {
 105                 __default_send_IPI_shortcut(APIC_DEST_ALLBUT,
 106                                             vector, apic->dest_logical);
 107         }
 108 }
 109
 110 static void flat_send_IPI_all(int vector)
 111 {
 112         if (vector == NMI_VECTOR) {
 113                 flat_send_IPI_mask(cpu_online_mask, vector);
 114         } else {
 115                 __default_send_IPI_shortcut(APIC_DEST_ALLINC,
 116                                             vector, apic->dest_logical);
 117         }
 118 }
 119
 120 static unsigned int flat_get_apic_id(unsigned long x)
 121 {
 122         unsigned int id;
 123
 124         id = (((x)>>24) & 0xFFu);
 125
 126         return id;
 127 }
 128
 129 static unsigned long set_apic_id(unsigned int id)
 130 {
 131         unsigned long x;
 132
 133         x = ((id & 0xFFu)<<24);
 134         return x;
 135 }
 136
 137 static unsigned int read_xapic_id(void)
 138 {
 139         unsigned int id;
 140
 141         id = flat_get_apic_id(apic_read(APIC_ID));
 142         return id;
 143 }
 144
 145 static int flat_apic_id_registered(void)
 146 {
 147         return physid_isset(read_xapic_id(), phys_cpu_present_map);
 148 }
 149
 150 static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
 151 {
 152         return initial_apic_id >> index_msb;
 153 }
 154
 155 static int flat_probe(void)
 156 {
 157         return 1;
 158 }
 159
 160 static struct apic apic_flat =  {
 161         .name                           = "flat",
 162         .probe                          = flat_probe,
 163         .acpi_madt_oem_check            = flat_acpi_madt_oem_check,
 164         .apic_id_valid                  = default_apic_id_valid,
 165         .apic_id_registered             = flat_apic_id_registered,
 166
 167         .irq_delivery_mode              = dest_LowestPrio,
 168         .irq_dest_mode                  = 1, /* logical */
 169
 170         .target_cpus                    = online_target_cpus,
 171         .disable_esr                    = 0,
 172         .dest_logical                   = APIC_DEST_LOGICAL,
 173         .check_apicid_used              = NULL,
 174         .check_apicid_present           = NULL,
 175
 176         .vector_allocation_domain       = flat_vector_allocation_domain,
 177         .init_apic_ldr                  = flat_init_apic_ldr,
 178
 179         .ioapic_phys_id_map             = NULL,
 180         .setup_apic_routing             = NULL,
 181         .multi_timer_check              = NULL,
 182         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 183         .apicid_to_cpu_present          = NULL,
 184         .setup_portio_remap             = NULL,
 185         .check_phys_apicid_present      = default_check_phys_apicid_present,
 186         .enable_apic_mode               = NULL,
 187         .phys_pkg_id                    = flat_phys_pkg_id,
 188         .mps_oem_check                  = NULL,
 189
 190         .get_apic_id                    = flat_get_apic_id,
 191         .set_apic_id                    = set_apic_id,
 192         .apic_id_mask                   = 0xFFu << 24,
 193
 194         .cpu_mask_to_apicid_and         = flat_cpu_mask_to_apicid_and,
 195
 196         .send_IPI_mask                  = flat_send_IPI_mask,
 197         .send_IPI_mask_allbutself       = flat_send_IPI_mask_allbutself,
 198         .send_IPI_allbutself            = flat_send_IPI_allbutself,
 199         .send_IPI_all                   = flat_send_IPI_all,
 200         .send_IPI_self                  = apic_send_IPI_self,
 201
 202         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 203         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 204         .wait_for_init_deassert         = NULL,
 205         .smp_callin_clear_local_apic    = NULL,
 206         .inquire_remote_apic            = default_inquire_remote_apic,
 207
 208         .read                           = native_apic_mem_read,
 209         .write                          = native_apic_mem_write,
 210         .eoi_write                      = native_apic_mem_write,
 211         .icr_read                       = native_apic_icr_read,
 212         .icr_write                      = native_apic_icr_write,
 213         .wait_icr_idle                  = native_apic_wait_icr_idle,
 214         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 215 };
 216
 217 /*
 218  * Physflat mode is used when there are more than 8 CPUs on a system.
 219  * We cannot use logical delivery in this case because the mask
 220  * overflows, so use physical mode.
 221  */
 222 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 223 {
 224 #ifdef CONFIG_ACPI
 225         /*
 226          * Quirk: some x86_64 machines can only use physical APIC mode
 227          * regardless of how many processors are present (x86_64 ES7000
 228          * is an example).
 229          */
 230         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
 231                 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
 232                 printk(KERN_DEBUG "system APIC only can use physical flat");
 233                 return 1;
 234         }
 235
 236         if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
 237                 printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
 238                 return 1;
 239         }
 240 #endif
 241
 242         return 0;
 243 }
 244
 245 static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
 246 {
 247         default_send_IPI_mask_sequence_phys(cpumask, vector);
 248 }
 249
 250 static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
 251                                               int vector)
 252 {
 253         default_send_IPI_mask_allbutself_phys(cpumask, vector);
 254 }
 255
 256 static void physflat_send_IPI_allbutself(int vector)
 257 {
 258         default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
 259 }
 260
 261 static void physflat_send_IPI_all(int vector)
 262 {
 263         physflat_send_IPI_mask(cpu_online_mask, vector);
 264 }
 265
 266 static int physflat_probe(void)
 267 {
 268         if (apic == &apic_physflat || num_possible_cpus() > 8)
 269                 return 1;
 270
 271         return 0;
 272 }
 273
 274 static struct apic apic_physflat =  {
 275
 276         .name                           = "physical flat",
 277         .probe                          = physflat_probe,
 278         .acpi_madt_oem_check            = physflat_acpi_madt_oem_check,
 279         .apic_id_valid                  = default_apic_id_valid,
 280         .apic_id_registered             = flat_apic_id_registered,
 281
 282         .irq_delivery_mode              = dest_Fixed,
 283         .irq_dest_mode                  = 0, /* physical */
 284
 285         .target_cpus                    = online_target_cpus,
 286         .disable_esr                    = 0,
 287         .dest_logical                   = 0,
 288         .check_apicid_used              = NULL,
 289         .check_apicid_present           = NULL,
 290
 291         .vector_allocation_domain       = default_vector_allocation_domain,
 292         /* not needed, but shouldn't hurt: */
 293         .init_apic_ldr                  = flat_init_apic_ldr,
 294
 295         .ioapic_phys_id_map             = NULL,
 296         .setup_apic_routing             = NULL,
 297         .multi_timer_check              = NULL,
 298         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 299         .apicid_to_cpu_present          = NULL,
 300         .setup_portio_remap             = NULL,
 301         .check_phys_apicid_present      = default_check_phys_apicid_present,
 302         .enable_apic_mode               = NULL,
 303         .phys_pkg_id                    = flat_phys_pkg_id,
 304         .mps_oem_check                  = NULL,
 305
 306         .get_apic_id                    = flat_get_apic_id,
 307         .set_apic_id                    = set_apic_id,
 308         .apic_id_mask                   = 0xFFu << 24,
 309
 310         .cpu_mask_to_apicid_and         = default_cpu_mask_to_apicid_and,
 311
 312         .send_IPI_mask                  = physflat_send_IPI_mask,
 313         .send_IPI_mask_allbutself       = physflat_send_IPI_mask_allbutself,
 314         .send_IPI_allbutself            = physflat_send_IPI_allbutself,
 315         .send_IPI_all                   = physflat_send_IPI_all,
 316         .send_IPI_self                  = apic_send_IPI_self,
 317
 318         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 319         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 320         .wait_for_init_deassert         = NULL,
 321         .smp_callin_clear_local_apic    = NULL,
 322         .inquire_remote_apic            = default_inquire_remote_apic,
 323
 324         .read                           = native_apic_mem_read,
 325         .write                          = native_apic_mem_write,
 326         .eoi_write                      = native_apic_mem_write,
 327         .icr_read                       = native_apic_icr_read,
 328         .icr_write                      = native_apic_icr_write,
 329         .wait_icr_idle                  = native_apic_wait_icr_idle,
 330         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 331 };
 332
 333 /*
 334  * We need to check for physflat first, so this order is important.
 335  */
 336 apic_drivers(apic_physflat, apic_flat);