arch/x86/kernel/apic/x2apic_uv_x.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * SGI UV APIC functions (note: not an Intel compatible APIC)
   7  *
   8  * Copyright (C) 2007-2010 Silicon Graphics, Inc. All rights reserved.
   9  */
  10 #include <linux/cpumask.h>
  11 #include <linux/hardirq.h>
  12 #include <linux/proc_fs.h>
  13 #include <linux/threads.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/string.h>
  17 #include <linux/ctype.h>
  18 #include <linux/sched.h>
  19 #include <linux/timer.h>
  20 #include <linux/slab.h>
  21 #include <linux/cpu.h>
  22 #include <linux/init.h>
  23 #include <linux/io.h>
  24 #include <linux/pci.h>
  25 #include <linux/kdebug.h>
  26 #include <linux/delay.h>
  27 #include <linux/crash_dump.h>
  28
  29 #include <asm/uv/uv_mmrs.h>
  30 #include <asm/uv/uv_hub.h>
  31 #include <asm/current.h>
  32 #include <asm/pgtable.h>
  33 #include <asm/uv/bios.h>
  34 #include <asm/uv/uv.h>
  35 #include <asm/apic.h>
  36 #include <asm/ipi.h>
  37 #include <asm/smp.h>
  38 #include <asm/x86_init.h>
  39 #include <asm/emergency-restart.h>
  40 #include <asm/nmi.h>
  41
  42 /* BMC sets a bit this MMR non-zero before sending an NMI */
  43 #define UVH_NMI_MMR                             UVH_SCRATCH5
  44 #define UVH_NMI_MMR_CLEAR                       (UVH_NMI_MMR + 8)
  45 #define UV_NMI_PENDING_MASK                     (1UL << 63)
  46 DEFINE_PER_CPU(unsigned long, cpu_last_nmi_count);
  47
  48 DEFINE_PER_CPU(int, x2apic_extra_bits);
  49
  50 #define PR_DEVEL(fmt, args...)  pr_devel("%s: " fmt, __func__, args)
  51
  52 static enum uv_system_type uv_system_type;
  53 static u64 gru_start_paddr, gru_end_paddr;
  54 static union uvh_apicid uvh_apicid;
  55 int uv_min_hub_revision_id;
  56 EXPORT_SYMBOL_GPL(uv_min_hub_revision_id);
  57 unsigned int uv_apicid_hibits;
  58 EXPORT_SYMBOL_GPL(uv_apicid_hibits);
  59 static DEFINE_SPINLOCK(uv_nmi_lock);
  60
  61 static struct apic apic_x2apic_uv_x;
  62
  63 static unsigned long __init uv_early_read_mmr(unsigned long addr)
  64 {
  65         unsigned long val, *mmr;
  66
  67         mmr = early_ioremap(UV_LOCAL_MMR_BASE | addr, sizeof(*mmr));
  68         val = *mmr;
  69         early_iounmap(mmr, sizeof(*mmr));
  70         return val;
  71 }
  72
  73 static inline bool is_GRU_range(u64 start, u64 end)
  74 {
  75         return start >= gru_start_paddr && end <= gru_end_paddr;
  76 }
  77
  78 static bool uv_is_untracked_pat_range(u64 start, u64 end)
  79 {
  80         return is_ISA_range(start, end) || is_GRU_range(start, end);
  81 }
  82
  83 static int __init early_get_pnodeid(void)
  84 {
  85         union uvh_node_id_u node_id;
  86         union uvh_rh_gam_config_mmr_u  m_n_config;
  87         int pnode;
  88
  89         /* Currently, all blades have same revision number */
  90         node_id.v = uv_early_read_mmr(UVH_NODE_ID);
  91         m_n_config.v = uv_early_read_mmr(UVH_RH_GAM_CONFIG_MMR);
  92         uv_min_hub_revision_id = node_id.s.revision;
  93
  94         if (node_id.s.part_number == UV2_HUB_PART_NUMBER)
  95                 uv_min_hub_revision_id += UV2_HUB_REVISION_BASE - 1;
  96         if (node_id.s.part_number == UV2_HUB_PART_NUMBER_X)
  97                 uv_min_hub_revision_id += UV2_HUB_REVISION_BASE - 1;
  98
  99         uv_hub_info->hub_revision = uv_min_hub_revision_id;
 100         pnode = (node_id.s.node_id >> 1) & ((1 << m_n_config.s.n_skt) - 1);
 101         return pnode;
 102 }
 103
 104 static void __init early_get_apic_pnode_shift(void)
 105 {
 106         uvh_apicid.v = uv_early_read_mmr(UVH_APICID);
 107         if (!uvh_apicid.v)
 108                 /*
 109                  * Old bios, use default value
 110                  */
 111                 uvh_apicid.s.pnode_shift = UV_APIC_PNODE_SHIFT;
 112 }
 113
 114 /*
 115  * Add an extra bit as dictated by bios to the destination apicid of
 116  * interrupts potentially passing through the UV HUB.  This prevents
 117  * a deadlock between interrupts and IO port operations.
 118  */
 119 static void __init uv_set_apicid_hibit(void)
 120 {
 121         union uv1h_lb_target_physical_apic_id_mask_u apicid_mask;
 122
 123         if (is_uv1_hub()) {
 124                 apicid_mask.v =
 125                         uv_early_read_mmr(UV1H_LB_TARGET_PHYSICAL_APIC_ID_MASK);
 126                 uv_apicid_hibits =
 127                         apicid_mask.s1.bit_enables & UV_APICID_HIBIT_MASK;
 128         }
 129 }
 130
 131 static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 132 {
 133         int pnodeid, is_uv1, is_uv2;
 134
 135         is_uv1 = !strcmp(oem_id, "SGI");
 136         is_uv2 = !strcmp(oem_id, "SGI2");
 137         if (is_uv1 || is_uv2) {
 138                 uv_hub_info->hub_revision =
 139                         is_uv1 ? UV1_HUB_REVISION_BASE : UV2_HUB_REVISION_BASE;
 140                 pnodeid = early_get_pnodeid();
 141                 early_get_apic_pnode_shift();
 142                 x86_platform.is_untracked_pat_range =  uv_is_untracked_pat_range;
 143                 x86_platform.nmi_init = uv_nmi_init;
 144                 if (!strcmp(oem_table_id, "UVL"))
 145                         uv_system_type = UV_LEGACY_APIC;
 146                 else if (!strcmp(oem_table_id, "UVX"))
 147                         uv_system_type = UV_X2APIC;
 148                 else if (!strcmp(oem_table_id, "UVH")) {
 149                         __this_cpu_write(x2apic_extra_bits,
 150                                 pnodeid << uvh_apicid.s.pnode_shift);
 151                         uv_system_type = UV_NON_UNIQUE_APIC;
 152                         uv_set_apicid_hibit();
 153                         return 1;
 154                 }
 155         }
 156         return 0;
 157 }
 158
 159 enum uv_system_type get_uv_system_type(void)
 160 {
 161         return uv_system_type;
 162 }
 163
 164 int is_uv_system(void)
 165 {
 166         return uv_system_type != UV_NONE;
 167 }
 168 EXPORT_SYMBOL_GPL(is_uv_system);
 169
 170 DEFINE_PER_CPU(struct uv_hub_info_s, __uv_hub_info);
 171 EXPORT_PER_CPU_SYMBOL_GPL(__uv_hub_info);
 172
 173 struct uv_blade_info *uv_blade_info;
 174 EXPORT_SYMBOL_GPL(uv_blade_info);
 175
 176 short *uv_node_to_blade;
 177 EXPORT_SYMBOL_GPL(uv_node_to_blade);
 178
 179 short *uv_cpu_to_blade;
 180 EXPORT_SYMBOL_GPL(uv_cpu_to_blade);
 181
 182 short uv_possible_blades;
 183 EXPORT_SYMBOL_GPL(uv_possible_blades);
 184
 185 unsigned long sn_rtc_cycles_per_second;
 186 EXPORT_SYMBOL(sn_rtc_cycles_per_second);
 187
 188 static const struct cpumask *uv_target_cpus(void)
 189 {
 190         return cpu_online_mask;
 191 }
 192
 193 static void uv_vector_allocation_domain(int cpu, struct cpumask *retmask)
 194 {
 195         cpumask_clear(retmask);
 196         cpumask_set_cpu(cpu, retmask);
 197 }
 198
 199 static int __cpuinit uv_wakeup_secondary(int phys_apicid, unsigned long start_rip)
 200 {
 201 #ifdef CONFIG_SMP
 202         unsigned long val;
 203         int pnode;
 204
 205         pnode = uv_apicid_to_pnode(phys_apicid);
 206         phys_apicid |= uv_apicid_hibits;
 207         val = (1UL << UVH_IPI_INT_SEND_SHFT) |
 208             (phys_apicid << UVH_IPI_INT_APIC_ID_SHFT) |
 209             ((start_rip << UVH_IPI_INT_VECTOR_SHFT) >> 12) |
 210             APIC_DM_INIT;
 211         uv_write_global_mmr64(pnode, UVH_IPI_INT, val);
 212
 213         val = (1UL << UVH_IPI_INT_SEND_SHFT) |
 214             (phys_apicid << UVH_IPI_INT_APIC_ID_SHFT) |
 215             ((start_rip << UVH_IPI_INT_VECTOR_SHFT) >> 12) |
 216             APIC_DM_STARTUP;
 217         uv_write_global_mmr64(pnode, UVH_IPI_INT, val);
 218
 219         atomic_set(&init_deasserted, 1);
 220 #endif
 221         return 0;
 222 }
 223
 224 static void uv_send_IPI_one(int cpu, int vector)
 225 {
 226         unsigned long apicid;
 227         int pnode;
 228
 229         apicid = per_cpu(x86_cpu_to_apicid, cpu);
 230         pnode = uv_apicid_to_pnode(apicid);
 231         uv_hub_send_ipi(pnode, apicid, vector);
 232 }
 233
 234 static void uv_send_IPI_mask(const struct cpumask *mask, int vector)
 235 {
 236         unsigned int cpu;
 237
 238         for_each_cpu(cpu, mask)
 239                 uv_send_IPI_one(cpu, vector);
 240 }
 241
 242 static void uv_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
 243 {
 244         unsigned int this_cpu = smp_processor_id();
 245         unsigned int cpu;
 246
 247         for_each_cpu(cpu, mask) {
 248                 if (cpu != this_cpu)
 249                         uv_send_IPI_one(cpu, vector);
 250         }
 251 }
 252
 253 static void uv_send_IPI_allbutself(int vector)
 254 {
 255         unsigned int this_cpu = smp_processor_id();
 256         unsigned int cpu;
 257
 258         for_each_online_cpu(cpu) {
 259                 if (cpu != this_cpu)
 260                         uv_send_IPI_one(cpu, vector);
 261         }
 262 }
 263
 264 static void uv_send_IPI_all(int vector)
 265 {
 266         uv_send_IPI_mask(cpu_online_mask, vector);
 267 }
 268
 269 static int uv_apic_id_valid(int apicid)
 270 {
 271         return 1;
 272 }
 273
 274 static int uv_apic_id_registered(void)
 275 {
 276         return 1;
 277 }
 278
 279 static void uv_init_apic_ldr(void)
 280 {
 281 }
 282
 283 static unsigned int uv_cpu_mask_to_apicid(const struct cpumask *cpumask)
 284 {
 285         /*
 286          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 287          * May as well be the first.
 288          */
 289         int cpu = cpumask_first(cpumask);
 290
 291         if ((unsigned)cpu < nr_cpu_ids)
 292                 return per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
 293         else
 294                 return BAD_APICID;
 295 }
 296
 297 static unsigned int
 298 uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 299                           const struct cpumask *andmask)
 300 {
 301         int cpu;
 302
 303         /*
 304          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 305          * May as well be the first.
 306          */
 307         for_each_cpu_and(cpu, cpumask, andmask) {
 308                 if (cpumask_test_cpu(cpu, cpu_online_mask))
 309                         break;
 310         }
 311         return per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
 312 }
 313
 314 static unsigned int x2apic_get_apic_id(unsigned long x)
 315 {
 316         unsigned int id;
 317
 318         WARN_ON(preemptible() && num_online_cpus() > 1);
 319         id = x | __this_cpu_read(x2apic_extra_bits);
 320
 321         return id;
 322 }
 323
 324 static unsigned long set_apic_id(unsigned int id)
 325 {
 326         unsigned long x;
 327
 328         /* maskout x2apic_extra_bits ? */
 329         x = id;
 330         return x;
 331 }
 332
 333 static unsigned int uv_read_apic_id(void)
 334 {
 335
 336         return x2apic_get_apic_id(apic_read(APIC_ID));
 337 }
 338
 339 static int uv_phys_pkg_id(int initial_apicid, int index_msb)
 340 {
 341         return uv_read_apic_id() >> index_msb;
 342 }
 343
 344 static void uv_send_IPI_self(int vector)
 345 {
 346         apic_write(APIC_SELF_IPI, vector);
 347 }
 348
 349 static int uv_probe(void)
 350 {
 351         return apic == &apic_x2apic_uv_x;
 352 }
 353
 354 static struct apic __refdata apic_x2apic_uv_x = {
 355
 356         .name                           = "UV large system",
 357         .probe                          = uv_probe,
 358         .acpi_madt_oem_check            = uv_acpi_madt_oem_check,
 359         .apic_id_valid                  = uv_apic_id_valid,
 360         .apic_id_registered             = uv_apic_id_registered,
 361
 362         .irq_delivery_mode              = dest_Fixed,
 363         .irq_dest_mode                  = 0, /* physical */
 364
 365         .target_cpus                    = uv_target_cpus,
 366         .disable_esr                    = 0,
 367         .dest_logical                   = APIC_DEST_LOGICAL,
 368         .check_apicid_used              = NULL,
 369         .check_apicid_present           = NULL,
 370
 371         .vector_allocation_domain       = uv_vector_allocation_domain,
 372         .init_apic_ldr                  = uv_init_apic_ldr,
 373
 374         .ioapic_phys_id_map             = NULL,
 375         .setup_apic_routing             = NULL,
 376         .multi_timer_check              = NULL,
 377         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 378         .apicid_to_cpu_present          = NULL,
 379         .setup_portio_remap             = NULL,
 380         .check_phys_apicid_present      = default_check_phys_apicid_present,
 381         .enable_apic_mode               = NULL,
 382         .phys_pkg_id                    = uv_phys_pkg_id,
 383         .mps_oem_check                  = NULL,
 384
 385         .get_apic_id                    = x2apic_get_apic_id,
 386         .set_apic_id                    = set_apic_id,
 387         .apic_id_mask                   = 0xFFFFFFFFu,
 388
 389         .cpu_mask_to_apicid             = uv_cpu_mask_to_apicid,
 390         .cpu_mask_to_apicid_and         = uv_cpu_mask_to_apicid_and,
 391
 392         .send_IPI_mask                  = uv_send_IPI_mask,
 393         .send_IPI_mask_allbutself       = uv_send_IPI_mask_allbutself,
 394         .send_IPI_allbutself            = uv_send_IPI_allbutself,
 395         .send_IPI_all                   = uv_send_IPI_all,
 396         .send_IPI_self                  = uv_send_IPI_self,
 397
 398         .wakeup_secondary_cpu           = uv_wakeup_secondary,
 399         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 400         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 401         .wait_for_init_deassert         = NULL,
 402         .smp_callin_clear_local_apic    = NULL,
 403         .inquire_remote_apic            = NULL,
 404
 405         .read                           = native_apic_msr_read,
 406         .write                          = native_apic_msr_write,
 407         .icr_read                       = native_x2apic_icr_read,
 408         .icr_write                      = native_x2apic_icr_write,
 409         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 410         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 411 };
 412
 413 static __cpuinit void set_x2apic_extra_bits(int pnode)
 414 {
 415         __this_cpu_write(x2apic_extra_bits, pnode << uvh_apicid.s.pnode_shift);
 416 }
 417
 418 /*
 419  * Called on boot cpu.
 420  */
 421 static __init int boot_pnode_to_blade(int pnode)
 422 {
 423         int blade;
 424
 425         for (blade = 0; blade < uv_num_possible_blades(); blade++)
 426                 if (pnode == uv_blade_info[blade].pnode)
 427                         return blade;
 428         BUG();
 429 }
 430
 431 struct redir_addr {
 432         unsigned long redirect;
 433         unsigned long alias;
 434 };
 435
 436 #define DEST_SHIFT UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_0_MMR_DEST_BASE_SHFT
 437
 438 static __initdata struct redir_addr redir_addrs[] = {
 439         {UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_0_MMR, UVH_RH_GAM_ALIAS210_OVERLAY_CONFIG_0_MMR},
 440         {UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_1_MMR, UVH_RH_GAM_ALIAS210_OVERLAY_CONFIG_1_MMR},
 441         {UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_2_MMR, UVH_RH_GAM_ALIAS210_OVERLAY_CONFIG_2_MMR},
 442 };
 443
 444 static __init void get_lowmem_redirect(unsigned long *base, unsigned long *size)
 445 {
 446         union uvh_rh_gam_alias210_overlay_config_2_mmr_u alias;
 447         union uvh_rh_gam_alias210_redirect_config_2_mmr_u redirect;
 448         int i;
 449
 450         for (i = 0; i < ARRAY_SIZE(redir_addrs); i++) {
 451                 alias.v = uv_read_local_mmr(redir_addrs[i].alias);
 452                 if (alias.s.enable && alias.s.base == 0) {
 453                         *size = (1UL << alias.s.m_alias);
 454                         redirect.v = uv_read_local_mmr(redir_addrs[i].redirect);
 455                         *base = (unsigned long)redirect.s.dest_base << DEST_SHIFT;
 456                         return;
 457                 }
 458         }
 459         *base = *size = 0;
 460 }
 461
 462 enum map_type {map_wb, map_uc};
 463
 464 static __init void map_high(char *id, unsigned long base, int pshift,
 465                         int bshift, int max_pnode, enum map_type map_type)
 466 {
 467         unsigned long bytes, paddr;
 468
 469         paddr = base << pshift;
 470         bytes = (1UL << bshift) * (max_pnode + 1);
 471         printk(KERN_INFO "UV: Map %s_HI 0x%lx - 0x%lx\n", id, paddr,
 472                                                 paddr + bytes);
 473         if (map_type == map_uc)
 474                 init_extra_mapping_uc(paddr, bytes);
 475         else
 476                 init_extra_mapping_wb(paddr, bytes);
 477
 478 }
 479 static __init void map_gru_high(int max_pnode)
 480 {
 481         union uvh_rh_gam_gru_overlay_config_mmr_u gru;
 482         int shift = UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR_BASE_SHFT;
 483
 484         gru.v = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR);
 485         if (gru.s.enable) {
 486                 map_high("GRU", gru.s.base, shift, shift, max_pnode, map_wb);
 487                 gru_start_paddr = ((u64)gru.s.base << shift);
 488                 gru_end_paddr = gru_start_paddr + (1UL << shift) * (max_pnode + 1);
 489
 490         }
 491 }
 492
 493 static __init void map_mmr_high(int max_pnode)
 494 {
 495         union uvh_rh_gam_mmr_overlay_config_mmr_u mmr;
 496         int shift = UVH_RH_GAM_MMR_OVERLAY_CONFIG_MMR_BASE_SHFT;
 497
 498         mmr.v = uv_read_local_mmr(UVH_RH_GAM_MMR_OVERLAY_CONFIG_MMR);
 499         if (mmr.s.enable)
 500                 map_high("MMR", mmr.s.base, shift, shift, max_pnode, map_uc);
 501 }
 502
 503 static __init void map_mmioh_high(int max_pnode)
 504 {
 505         union uvh_rh_gam_mmioh_overlay_config_mmr_u mmioh;
 506         int shift;
 507
 508         mmioh.v = uv_read_local_mmr(UVH_RH_GAM_MMIOH_OVERLAY_CONFIG_MMR);
 509         if (is_uv1_hub() && mmioh.s1.enable) {
 510                 shift = UV1H_RH_GAM_MMIOH_OVERLAY_CONFIG_MMR_BASE_SHFT;
 511                 map_high("MMIOH", mmioh.s1.base, shift, mmioh.s1.m_io,
 512                         max_pnode, map_uc);
 513         }
 514         if (is_uv2_hub() && mmioh.s2.enable) {
 515                 shift = UV2H_RH_GAM_MMIOH_OVERLAY_CONFIG_MMR_BASE_SHFT;
 516                 map_high("MMIOH", mmioh.s2.base, shift, mmioh.s2.m_io,
 517                         max_pnode, map_uc);
 518         }
 519 }
 520
 521 static __init void map_low_mmrs(void)
 522 {
 523         init_extra_mapping_uc(UV_GLOBAL_MMR32_BASE, UV_GLOBAL_MMR32_SIZE);
 524         init_extra_mapping_uc(UV_LOCAL_MMR_BASE, UV_LOCAL_MMR_SIZE);
 525 }
 526
 527 static __init void uv_rtc_init(void)
 528 {
 529         long status;
 530         u64 ticks_per_sec;
 531
 532         status = uv_bios_freq_base(BIOS_FREQ_BASE_REALTIME_CLOCK,
 533                                         &ticks_per_sec);
 534         if (status != BIOS_STATUS_SUCCESS || ticks_per_sec < 100000) {
 535                 printk(KERN_WARNING
 536                         "unable to determine platform RTC clock frequency, "
 537                         "guessing.\n");
 538                 /* BIOS gives wrong value for clock freq. so guess */
 539                 sn_rtc_cycles_per_second = 1000000000000UL / 30000UL;
 540         } else
 541                 sn_rtc_cycles_per_second = ticks_per_sec;
 542 }
 543
 544 /*
 545  * percpu heartbeat timer
 546  */
 547 static void uv_heartbeat(unsigned long ignored)
 548 {
 549         struct timer_list *timer = &uv_hub_info->scir.timer;
 550         unsigned char bits = uv_hub_info->scir.state;
 551
 552         /* flip heartbeat bit */
 553         bits ^= SCIR_CPU_HEARTBEAT;
 554
 555         /* is this cpu idle? */
 556         if (idle_cpu(raw_smp_processor_id()))
 557                 bits &= ~SCIR_CPU_ACTIVITY;
 558         else
 559                 bits |= SCIR_CPU_ACTIVITY;
 560
 561         /* update system controller interface reg */
 562         uv_set_scir_bits(bits);
 563
 564         /* enable next timer period */
 565         mod_timer_pinned(timer, jiffies + SCIR_CPU_HB_INTERVAL);
 566 }
 567
 568 static void __cpuinit uv_heartbeat_enable(int cpu)
 569 {
 570         while (!uv_cpu_hub_info(cpu)->scir.enabled) {
 571                 struct timer_list *timer = &uv_cpu_hub_info(cpu)->scir.timer;
 572
 573                 uv_set_cpu_scir_bits(cpu, SCIR_CPU_HEARTBEAT|SCIR_CPU_ACTIVITY);
 574                 setup_timer(timer, uv_heartbeat, cpu);
 575                 timer->expires = jiffies + SCIR_CPU_HB_INTERVAL;
 576                 add_timer_on(timer, cpu);
 577                 uv_cpu_hub_info(cpu)->scir.enabled = 1;
 578
 579                 /* also ensure that boot cpu is enabled */
 580                 cpu = 0;
 581         }
 582 }
 583
 584 #ifdef CONFIG_HOTPLUG_CPU
 585 static void __cpuinit uv_heartbeat_disable(int cpu)
 586 {
 587         if (uv_cpu_hub_info(cpu)->scir.enabled) {
 588                 uv_cpu_hub_info(cpu)->scir.enabled = 0;
 589                 del_timer(&uv_cpu_hub_info(cpu)->scir.timer);
 590         }
 591         uv_set_cpu_scir_bits(cpu, 0xff);
 592 }
 593
 594 /*
 595  * cpu hotplug notifier
 596  */
 597 static __cpuinit int uv_scir_cpu_notify(struct notifier_block *self,
 598                                        unsigned long action, void *hcpu)
 599 {
 600         long cpu = (long)hcpu;
 601
 602         switch (action) {
 603         case CPU_ONLINE:
 604                 uv_heartbeat_enable(cpu);
 605                 break;
 606         case CPU_DOWN_PREPARE:
 607                 uv_heartbeat_disable(cpu);
 608                 break;
 609         default:
 610                 break;
 611         }
 612         return NOTIFY_OK;
 613 }
 614
 615 static __init void uv_scir_register_cpu_notifier(void)
 616 {
 617         hotcpu_notifier(uv_scir_cpu_notify, 0);
 618 }
 619
 620 #else /* !CONFIG_HOTPLUG_CPU */
 621
 622 static __init void uv_scir_register_cpu_notifier(void)
 623 {
 624 }
 625
 626 static __init int uv_init_heartbeat(void)
 627 {
 628         int cpu;
 629
 630         if (is_uv_system())
 631                 for_each_online_cpu(cpu)
 632                         uv_heartbeat_enable(cpu);
 633         return 0;
 634 }
 635
 636 late_initcall(uv_init_heartbeat);
 637
 638 #endif /* !CONFIG_HOTPLUG_CPU */
 639
 640 /* Direct Legacy VGA I/O traffic to designated IOH */
 641 int uv_set_vga_state(struct pci_dev *pdev, bool decode,
 642                       unsigned int command_bits, u32 flags)
 643 {
 644         int domain, bus, rc;
 645
 646         PR_DEVEL("devfn %x decode %d cmd %x flags %d\n",
 647                         pdev->devfn, decode, command_bits, flags);
 648
 649         if (!(flags & PCI_VGA_STATE_CHANGE_BRIDGE))
 650                 return 0;
 651
 652         if ((command_bits & PCI_COMMAND_IO) == 0)
 653                 return 0;
 654
 655         domain = pci_domain_nr(pdev->bus);
 656         bus = pdev->bus->number;
 657
 658         rc = uv_bios_set_legacy_vga_target(decode, domain, bus);
 659         PR_DEVEL("vga decode %d %x:%x, rc: %d\n", decode, domain, bus, rc);
 660
 661         return rc;
 662 }
 663
 664 /*
 665  * Called on each cpu to initialize the per_cpu UV data area.
 666  * FIXME: hotplug not supported yet
 667  */
 668 void __cpuinit uv_cpu_init(void)
 669 {
 670         /* CPU 0 initilization will be done via uv_system_init. */
 671         if (!uv_blade_info)
 672                 return;
 673
 674         uv_blade_info[uv_numa_blade_id()].nr_online_cpus++;
 675
 676         if (get_uv_system_type() == UV_NON_UNIQUE_APIC)
 677                 set_x2apic_extra_bits(uv_hub_info->pnode);
 678 }
 679
 680 /*
 681  * When NMI is received, print a stack trace.
 682  */
 683 int uv_handle_nmi(unsigned int reason, struct pt_regs *regs)
 684 {
 685         unsigned long real_uv_nmi;
 686         int bid;
 687
 688         /*
 689          * Each blade has an MMR that indicates when an NMI has been sent
 690          * to cpus on the blade. If an NMI is detected, atomically
 691          * clear the MMR and update a per-blade NMI count used to
 692          * cause each cpu on the blade to notice a new NMI.
 693          */
 694         bid = uv_numa_blade_id();
 695         real_uv_nmi = (uv_read_local_mmr(UVH_NMI_MMR) & UV_NMI_PENDING_MASK);
 696
 697         if (unlikely(real_uv_nmi)) {
 698                 spin_lock(&uv_blade_info[bid].nmi_lock);
 699                 real_uv_nmi = (uv_read_local_mmr(UVH_NMI_MMR) & UV_NMI_PENDING_MASK);
 700                 if (real_uv_nmi) {
 701                         uv_blade_info[bid].nmi_count++;
 702                         uv_write_local_mmr(UVH_NMI_MMR_CLEAR, UV_NMI_PENDING_MASK);
 703                 }
 704                 spin_unlock(&uv_blade_info[bid].nmi_lock);
 705         }
 706
 707         if (likely(__get_cpu_var(cpu_last_nmi_count) == uv_blade_info[bid].nmi_count))
 708                 return NMI_DONE;
 709
 710         __get_cpu_var(cpu_last_nmi_count) = uv_blade_info[bid].nmi_count;
 711
 712         /*
 713          * Use a lock so only one cpu prints at a time.
 714          * This prevents intermixed output.
 715          */
 716         spin_lock(&uv_nmi_lock);
 717         pr_info("UV NMI stack dump cpu %u:\n", smp_processor_id());
 718         dump_stack();
 719         spin_unlock(&uv_nmi_lock);
 720
 721         return NMI_HANDLED;
 722 }
 723
 724 void uv_register_nmi_notifier(void)
 725 {
 726         if (register_nmi_handler(NMI_UNKNOWN, uv_handle_nmi, 0, "uv"))
 727                 printk(KERN_WARNING "UV NMI handler failed to register\n");
 728 }
 729
 730 void uv_nmi_init(void)
 731 {
 732         unsigned int value;
 733
 734         /*
 735          * Unmask NMI on all cpus
 736          */
 737         value = apic_read(APIC_LVT1) | APIC_DM_NMI;
 738         value &= ~APIC_LVT_MASKED;
 739         apic_write(APIC_LVT1, value);
 740 }
 741
 742 void __init uv_system_init(void)
 743 {
 744         union uvh_rh_gam_config_mmr_u  m_n_config;
 745         union uvh_rh_gam_mmioh_overlay_config_mmr_u mmioh;
 746         union uvh_node_id_u node_id;
 747         unsigned long gnode_upper, lowmem_redir_base, lowmem_redir_size;
 748         int bytes, nid, cpu, lcpu, pnode, blade, i, j, m_val, n_val, n_io;
 749         int gnode_extra, max_pnode = 0;
 750         unsigned long mmr_base, present, paddr;
 751         unsigned short pnode_mask, pnode_io_mask;
 752
 753         printk(KERN_INFO "UV: Found %s hub\n", is_uv1_hub() ? "UV1" : "UV2");
 754         map_low_mmrs();
 755
 756         m_n_config.v = uv_read_local_mmr(UVH_RH_GAM_CONFIG_MMR );
 757         m_val = m_n_config.s.m_skt;
 758         n_val = m_n_config.s.n_skt;
 759         mmioh.v = uv_read_local_mmr(UVH_RH_GAM_MMIOH_OVERLAY_CONFIG_MMR);
 760         n_io = is_uv1_hub() ? mmioh.s1.n_io : mmioh.s2.n_io;
 761         mmr_base =
 762             uv_read_local_mmr(UVH_RH_GAM_MMR_OVERLAY_CONFIG_MMR) &
 763             ~UV_MMR_ENABLE;
 764         pnode_mask = (1 << n_val) - 1;
 765         pnode_io_mask = (1 << n_io) - 1;
 766
 767         node_id.v = uv_read_local_mmr(UVH_NODE_ID);
 768         gnode_extra = (node_id.s.node_id & ~((1 << n_val) - 1)) >> 1;
 769         gnode_upper = ((unsigned long)gnode_extra  << m_val);
 770         printk(KERN_INFO "UV: N %d, M %d, N_IO: %d, gnode_upper 0x%lx, gnode_extra 0x%x, pnode_mask 0x%x, pnode_io_mask 0x%x\n",
 771                         n_val, m_val, n_io, gnode_upper, gnode_extra, pnode_mask, pnode_io_mask);
 772
 773         printk(KERN_DEBUG "UV: global MMR base 0x%lx\n", mmr_base);
 774
 775         for(i = 0; i < UVH_NODE_PRESENT_TABLE_DEPTH; i++)
 776                 uv_possible_blades +=
 777                   hweight64(uv_read_local_mmr( UVH_NODE_PRESENT_TABLE + i * 8));
 778
 779         /* uv_num_possible_blades() is really the hub count */
 780         printk(KERN_INFO "UV: Found %d blades, %d hubs\n",
 781                         is_uv1_hub() ? uv_num_possible_blades() :
 782                         (uv_num_possible_blades() + 1) / 2,
 783                         uv_num_possible_blades());
 784
 785         bytes = sizeof(struct uv_blade_info) * uv_num_possible_blades();
 786         uv_blade_info = kzalloc(bytes, GFP_KERNEL);
 787         BUG_ON(!uv_blade_info);
 788
 789         for (blade = 0; blade < uv_num_possible_blades(); blade++)
 790                 uv_blade_info[blade].memory_nid = -1;
 791
 792         get_lowmem_redirect(&lowmem_redir_base, &lowmem_redir_size);
 793
 794         bytes = sizeof(uv_node_to_blade[0]) * num_possible_nodes();
 795         uv_node_to_blade = kmalloc(bytes, GFP_KERNEL);
 796         BUG_ON(!uv_node_to_blade);
 797         memset(uv_node_to_blade, 255, bytes);
 798
 799         bytes = sizeof(uv_cpu_to_blade[0]) * num_possible_cpus();
 800         uv_cpu_to_blade = kmalloc(bytes, GFP_KERNEL);
 801         BUG_ON(!uv_cpu_to_blade);
 802         memset(uv_cpu_to_blade, 255, bytes);
 803
 804         blade = 0;
 805         for (i = 0; i < UVH_NODE_PRESENT_TABLE_DEPTH; i++) {
 806                 present = uv_read_local_mmr(UVH_NODE_PRESENT_TABLE + i * 8);
 807                 for (j = 0; j < 64; j++) {
 808                         if (!test_bit(j, &present))
 809                                 continue;
 810                         pnode = (i * 64 + j) & pnode_mask;
 811                         uv_blade_info[blade].pnode = pnode;
 812                         uv_blade_info[blade].nr_possible_cpus = 0;
 813                         uv_blade_info[blade].nr_online_cpus = 0;
 814                         spin_lock_init(&uv_blade_info[blade].nmi_lock);
 815                         max_pnode = max(pnode, max_pnode);
 816                         blade++;
 817                 }
 818         }
 819
 820         uv_bios_init();
 821         uv_bios_get_sn_info(0, &uv_type, &sn_partition_id, &sn_coherency_id,
 822                             &sn_region_size, &system_serial_number);
 823         uv_rtc_init();
 824
 825         for_each_present_cpu(cpu) {
 826                 int apicid = per_cpu(x86_cpu_to_apicid, cpu);
 827
 828                 nid = cpu_to_node(cpu);
 829                 /*
 830                  * apic_pnode_shift must be set before calling uv_apicid_to_pnode();
 831                  */
 832                 uv_cpu_hub_info(cpu)->pnode_mask = pnode_mask;
 833                 uv_cpu_hub_info(cpu)->apic_pnode_shift = uvh_apicid.s.pnode_shift;
 834                 uv_cpu_hub_info(cpu)->hub_revision = uv_hub_info->hub_revision;
 835
 836                 uv_cpu_hub_info(cpu)->m_shift = 64 - m_val;
 837                 uv_cpu_hub_info(cpu)->n_lshift = is_uv2_1_hub() ?
 838                                 (m_val == 40 ? 40 : 39) : m_val;
 839
 840                 pnode = uv_apicid_to_pnode(apicid);
 841                 blade = boot_pnode_to_blade(pnode);
 842                 lcpu = uv_blade_info[blade].nr_possible_cpus;
 843                 uv_blade_info[blade].nr_possible_cpus++;
 844
 845                 /* Any node on the blade, else will contain -1. */
 846                 uv_blade_info[blade].memory_nid = nid;
 847
 848                 uv_cpu_hub_info(cpu)->lowmem_remap_base = lowmem_redir_base;
 849                 uv_cpu_hub_info(cpu)->lowmem_remap_top = lowmem_redir_size;
 850                 uv_cpu_hub_info(cpu)->m_val = m_val;
 851                 uv_cpu_hub_info(cpu)->n_val = n_val;
 852                 uv_cpu_hub_info(cpu)->numa_blade_id = blade;
 853                 uv_cpu_hub_info(cpu)->blade_processor_id = lcpu;
 854                 uv_cpu_hub_info(cpu)->pnode = pnode;
 855                 uv_cpu_hub_info(cpu)->gpa_mask = (1UL << (m_val + n_val)) - 1;
 856                 uv_cpu_hub_info(cpu)->gnode_upper = gnode_upper;
 857                 uv_cpu_hub_info(cpu)->gnode_extra = gnode_extra;
 858                 uv_cpu_hub_info(cpu)->global_mmr_base = mmr_base;
 859                 uv_cpu_hub_info(cpu)->coherency_domain_number = sn_coherency_id;
 860                 uv_cpu_hub_info(cpu)->scir.offset = uv_scir_offset(apicid);
 861                 uv_node_to_blade[nid] = blade;
 862                 uv_cpu_to_blade[cpu] = blade;
 863         }
 864
 865         /* Add blade/pnode info for nodes without cpus */
 866         for_each_online_node(nid) {
 867                 if (uv_node_to_blade[nid] >= 0)
 868                         continue;
 869                 paddr = node_start_pfn(nid) << PAGE_SHIFT;
 870                 pnode = uv_gpa_to_pnode(uv_soc_phys_ram_to_gpa(paddr));
 871                 blade = boot_pnode_to_blade(pnode);
 872                 uv_node_to_blade[nid] = blade;
 873         }
 874
 875         map_gru_high(max_pnode);
 876         map_mmr_high(max_pnode);
 877         map_mmioh_high(max_pnode & pnode_io_mask);
 878
 879         uv_cpu_init();
 880         uv_scir_register_cpu_notifier();
 881         uv_register_nmi_notifier();
 882         proc_mkdir("sgi_uv", NULL);
 883
 884         /* register Legacy VGA I/O redirection handler */
 885         pci_register_set_vga_state(uv_set_vga_state);
 886
 887         /*
 888          * For a kdump kernel the reset must be BOOT_ACPI, not BOOT_EFI, as
 889          * EFI is not enabled in the kdump kernel.
 890          */
 891         if (is_kdump_kernel())
 892                 reboot_type = BOOT_ACPI;
 893 }
 894
 895 apic_driver(apic_x2apic_uv_x);