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