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 #include <asm/jailhouse_para.h>
  23
  24 #include <linux/acpi.h>
  25
  26 static struct apic apic_physflat;
  27 static struct apic apic_flat;
  28
  29 struct apic *apic __ro_after_init = &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 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         return (x >> 24) & 0xFF;
 121 }
 122
 123 static u32 set_apic_id(unsigned int id)
 124 {
 125         return (id & 0xFF) << 24;
 126 }
 127
 128 static unsigned int read_xapic_id(void)
 129 {
 130         return flat_get_apic_id(apic_read(APIC_ID));
 131 }
 132
 133 static int flat_apic_id_registered(void)
 134 {
 135         return physid_isset(read_xapic_id(), phys_cpu_present_map);
 136 }
 137
 138 static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
 139 {
 140         return initial_apic_id >> index_msb;
 141 }
 142
 143 static int flat_probe(void)
 144 {
 145         return 1;
 146 }
 147
 148 static struct apic apic_flat __ro_after_init = {
 149         .name                           = "flat",
 150         .probe                          = flat_probe,
 151         .acpi_madt_oem_check            = flat_acpi_madt_oem_check,
 152         .apic_id_valid                  = default_apic_id_valid,
 153         .apic_id_registered             = flat_apic_id_registered,
 154
 155         .irq_delivery_mode              = dest_Fixed,
 156         .irq_dest_mode                  = 1, /* logical */
 157
 158         .disable_esr                    = 0,
 159         .dest_logical                   = APIC_DEST_LOGICAL,
 160         .check_apicid_used              = NULL,
 161
 162         .init_apic_ldr                  = flat_init_apic_ldr,
 163
 164         .ioapic_phys_id_map             = NULL,
 165         .setup_apic_routing             = NULL,
 166         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 167         .apicid_to_cpu_present          = NULL,
 168         .check_phys_apicid_present      = default_check_phys_apicid_present,
 169         .phys_pkg_id                    = flat_phys_pkg_id,
 170
 171         .get_apic_id                    = flat_get_apic_id,
 172         .set_apic_id                    = set_apic_id,
 173
 174         .calc_dest_apicid               = apic_flat_calc_apicid,
 175
 176         .send_IPI                       = default_send_IPI_single,
 177         .send_IPI_mask                  = flat_send_IPI_mask,
 178         .send_IPI_mask_allbutself       = flat_send_IPI_mask_allbutself,
 179         .send_IPI_allbutself            = flat_send_IPI_allbutself,
 180         .send_IPI_all                   = flat_send_IPI_all,
 181         .send_IPI_self                  = apic_send_IPI_self,
 182
 183         .inquire_remote_apic            = default_inquire_remote_apic,
 184
 185         .read                           = native_apic_mem_read,
 186         .write                          = native_apic_mem_write,
 187         .eoi_write                      = native_apic_mem_write,
 188         .icr_read                       = native_apic_icr_read,
 189         .icr_write                      = native_apic_icr_write,
 190         .wait_icr_idle                  = native_apic_wait_icr_idle,
 191         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 192 };
 193
 194 /*
 195  * Physflat mode is used when there are more than 8 CPUs on a system.
 196  * We cannot use logical delivery in this case because the mask
 197  * overflows, so use physical mode.
 198  */
 199 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 200 {
 201 #ifdef CONFIG_ACPI
 202         /*
 203          * Quirk: some x86_64 machines can only use physical APIC mode
 204          * regardless of how many processors are present (x86_64 ES7000
 205          * is an example).
 206          */
 207         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
 208                 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
 209                 printk(KERN_DEBUG "system APIC only can use physical flat");
 210                 return 1;
 211         }
 212
 213         if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
 214                 printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
 215                 return 1;
 216         }
 217 #endif
 218
 219         return 0;
 220 }
 221
 222 static void physflat_init_apic_ldr(void)
 223 {
 224         /*
 225          * LDR and DFR are not involved in physflat mode, rather:
 226          * "In physical destination mode, the destination processor is
 227          * specified by its local APIC ID [...]." (Intel SDM, 10.6.2.1)
 228          */
 229 }
 230
 231 static void physflat_send_IPI_allbutself(int vector)
 232 {
 233         default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
 234 }
 235
 236 static void physflat_send_IPI_all(int vector)
 237 {
 238         default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
 239 }
 240
 241 static int physflat_probe(void)
 242 {
 243         if (apic == &apic_physflat || num_possible_cpus() > 8 ||
 244             jailhouse_paravirt())
 245                 return 1;
 246
 247         return 0;
 248 }
 249
 250 static struct apic apic_physflat __ro_after_init = {
 251
 252         .name                           = "physical flat",
 253         .probe                          = physflat_probe,
 254         .acpi_madt_oem_check            = physflat_acpi_madt_oem_check,
 255         .apic_id_valid                  = default_apic_id_valid,
 256         .apic_id_registered             = flat_apic_id_registered,
 257
 258         .irq_delivery_mode              = dest_Fixed,
 259         .irq_dest_mode                  = 0, /* physical */
 260
 261         .disable_esr                    = 0,
 262         .dest_logical                   = 0,
 263         .check_apicid_used              = NULL,
 264
 265         .init_apic_ldr                  = physflat_init_apic_ldr,
 266
 267         .ioapic_phys_id_map             = NULL,
 268         .setup_apic_routing             = NULL,
 269         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 270         .apicid_to_cpu_present          = NULL,
 271         .check_phys_apicid_present      = default_check_phys_apicid_present,
 272         .phys_pkg_id                    = flat_phys_pkg_id,
 273
 274         .get_apic_id                    = flat_get_apic_id,
 275         .set_apic_id                    = set_apic_id,
 276
 277         .calc_dest_apicid               = apic_default_calc_apicid,
 278
 279         .send_IPI                       = default_send_IPI_single_phys,
 280         .send_IPI_mask                  = default_send_IPI_mask_sequence_phys,
 281         .send_IPI_mask_allbutself       = default_send_IPI_mask_allbutself_phys,
 282         .send_IPI_allbutself            = physflat_send_IPI_allbutself,
 283         .send_IPI_all                   = physflat_send_IPI_all,
 284         .send_IPI_self                  = apic_send_IPI_self,
 285
 286         .inquire_remote_apic            = default_inquire_remote_apic,
 287
 288         .read                           = native_apic_mem_read,
 289         .write                          = native_apic_mem_write,
 290         .eoi_write                      = native_apic_mem_write,
 291         .icr_read                       = native_apic_icr_read,
 292         .icr_write                      = native_apic_icr_write,
 293         .wait_icr_idle                  = native_apic_wait_icr_idle,
 294         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 295 };
 296
 297 /*
 298  * We need to check for physflat first, so this order is important.
 299  */
 300 apic_drivers(apic_physflat, apic_flat);