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