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