arch/sparc64/kernel/irq.c

   1 /* irq.c: UltraSparc IRQ handling/init/registry.
   2  *
   3  * Copyright (C) 1997, 2007  David S. Miller  (davem@davemloft.net)
   4  * Copyright (C) 1998  Eddie C. Dost    (ecd@skynet.be)
   5  * Copyright (C) 1998  Jakub Jelinek    (jj@ultra.linux.cz)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/sched.h>
  10 #include <linux/ptrace.h>
  11 #include <linux/errno.h>
  12 #include <linux/kernel_stat.h>
  13 #include <linux/signal.h>
  14 #include <linux/mm.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/slab.h>
  17 #include <linux/random.h>
  18 #include <linux/init.h>
  19 #include <linux/delay.h>
  20 #include <linux/proc_fs.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/bootmem.h>
  23 #include <linux/irq.h>
  24
  25 #include <asm/ptrace.h>
  26 #include <asm/processor.h>
  27 #include <asm/atomic.h>
  28 #include <asm/system.h>
  29 #include <asm/irq.h>
  30 #include <asm/io.h>
  31 #include <asm/sbus.h>
  32 #include <asm/iommu.h>
  33 #include <asm/upa.h>
  34 #include <asm/oplib.h>
  35 #include <asm/prom.h>
  36 #include <asm/timer.h>
  37 #include <asm/smp.h>
  38 #include <asm/starfire.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/cache.h>
  41 #include <asm/cpudata.h>
  42 #include <asm/auxio.h>
  43 #include <asm/head.h>
  44 #include <asm/hypervisor.h>
  45 #include <asm/cacheflush.h>
  46
  47 /* UPA nodes send interrupt packet to UltraSparc with first data reg
  48  * value low 5 (7 on Starfire) bits holding the IRQ identifier being
  49  * delivered.  We must translate this into a non-vector IRQ so we can
  50  * set the softint on this cpu.
  51  *
  52  * To make processing these packets efficient and race free we use
  53  * an array of irq buckets below.  The interrupt vector handler in
  54  * entry.S feeds incoming packets into per-cpu pil-indexed lists.
  55  *
  56  * If you make changes to ino_bucket, please update hand coded assembler
  57  * of the vectored interrupt trap handler(s) in entry.S and sun4v_ivec.S
  58  */
  59 struct ino_bucket {
  60 /*0x00*/unsigned long __irq_chain_pa;
  61
  62         /* Virtual interrupt number assigned to this INO.  */
  63 /*0x08*/unsigned int __virt_irq;
  64 /*0x0c*/unsigned int __pad;
  65 };
  66
  67 #define NUM_IVECS       (IMAP_INR + 1)
  68 struct ino_bucket *ivector_table;
  69 unsigned long ivector_table_pa;
  70
  71 /* On several sun4u processors, it is illegal to mix bypass and
  72  * non-bypass accesses.  Therefore we access all INO buckets
  73  * using bypass accesses only.
  74  */
  75 static unsigned long bucket_get_chain_pa(unsigned long bucket_pa)
  76 {
  77         unsigned long ret;
  78
  79         __asm__ __volatile__("ldxa      [%1] %2, %0"
  80                              : "=&r" (ret)
  81                              : "r" (bucket_pa +
  82                                     offsetof(struct ino_bucket,
  83                                              __irq_chain_pa)),
  84                                "i" (ASI_PHYS_USE_EC));
  85
  86         return ret;
  87 }
  88
  89 static void bucket_clear_chain_pa(unsigned long bucket_pa)
  90 {
  91         __asm__ __volatile__("stxa      %%g0, [%0] %1"
  92                              : /* no outputs */
  93                              : "r" (bucket_pa +
  94                                     offsetof(struct ino_bucket,
  95                                              __irq_chain_pa)),
  96                                "i" (ASI_PHYS_USE_EC));
  97 }
  98
  99 static unsigned int bucket_get_virt_irq(unsigned long bucket_pa)
 100 {
 101         unsigned int ret;
 102
 103         __asm__ __volatile__("lduwa     [%1] %2, %0"
 104                              : "=&r" (ret)
 105                              : "r" (bucket_pa +
 106                                     offsetof(struct ino_bucket,
 107                                              __virt_irq)),
 108                                "i" (ASI_PHYS_USE_EC));
 109
 110         return ret;
 111 }
 112
 113 static void bucket_set_virt_irq(unsigned long bucket_pa,
 114                                 unsigned int virt_irq)
 115 {
 116         __asm__ __volatile__("stwa      %0, [%1] %2"
 117                              : /* no outputs */
 118                              : "r" (virt_irq),
 119                                "r" (bucket_pa +
 120                                     offsetof(struct ino_bucket,
 121                                              __virt_irq)),
 122                                "i" (ASI_PHYS_USE_EC));
 123 }
 124
 125 #define irq_work_pa(__cpu)      &(trap_block[(__cpu)].irq_worklist_pa)
 126
 127 static struct {
 128         unsigned int dev_handle;
 129         unsigned int dev_ino;
 130         unsigned int in_use;
 131 } virt_irq_table[NR_IRQS];
 132 static DEFINE_SPINLOCK(virt_irq_alloc_lock);
 133
 134 unsigned char virt_irq_alloc(unsigned int dev_handle,
 135                              unsigned int dev_ino)
 136 {
 137         unsigned long flags;
 138         unsigned char ent;
 139
 140         BUILD_BUG_ON(NR_IRQS >= 256);
 141
 142         spin_lock_irqsave(&virt_irq_alloc_lock, flags);
 143
 144         for (ent = 1; ent < NR_IRQS; ent++) {
 145                 if (!virt_irq_table[ent].in_use)
 146                         break;
 147         }
 148         if (ent >= NR_IRQS) {
 149                 printk(KERN_ERR "IRQ: Out of virtual IRQs.\n");
 150                 ent = 0;
 151         } else {
 152                 virt_irq_table[ent].dev_handle = dev_handle;
 153                 virt_irq_table[ent].dev_ino = dev_ino;
 154                 virt_irq_table[ent].in_use = 1;
 155         }
 156
 157         spin_unlock_irqrestore(&virt_irq_alloc_lock, flags);
 158
 159         return ent;
 160 }
 161
 162 #ifdef CONFIG_PCI_MSI
 163 void virt_irq_free(unsigned int virt_irq)
 164 {
 165         unsigned long flags;
 166
 167         if (virt_irq >= NR_IRQS)
 168                 return;
 169
 170         spin_lock_irqsave(&virt_irq_alloc_lock, flags);
 171
 172         virt_irq_table[virt_irq].in_use = 0;
 173
 174         spin_unlock_irqrestore(&virt_irq_alloc_lock, flags);
 175 }
 176 #endif
 177
 178 /*
 179  * /proc/interrupts printing:
 180  */
 181
 182 int show_interrupts(struct seq_file *p, void *v)
 183 {
 184         int i = *(loff_t *) v, j;
 185         struct irqaction * action;
 186         unsigned long flags;
 187
 188         if (i == 0) {
 189                 seq_printf(p, "           ");
 190                 for_each_online_cpu(j)
 191                         seq_printf(p, "CPU%d       ",j);
 192                 seq_putc(p, '\n');
 193         }
 194
 195         if (i < NR_IRQS) {
 196                 spin_lock_irqsave(&irq_desc[i].lock, flags);
 197                 action = irq_desc[i].action;
 198                 if (!action)
 199                         goto skip;
 200                 seq_printf(p, "%3d: ",i);
 201 #ifndef CONFIG_SMP
 202                 seq_printf(p, "%10u ", kstat_irqs(i));
 203 #else
 204                 for_each_online_cpu(j)
 205                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
 206 #endif
 207                 seq_printf(p, " %9s", irq_desc[i].chip->typename);
 208                 seq_printf(p, "  %s", action->name);
 209
 210                 for (action=action->next; action; action = action->next)
 211                         seq_printf(p, ", %s", action->name);
 212
 213                 seq_putc(p, '\n');
 214 skip:
 215                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 216         }
 217         return 0;
 218 }
 219
 220 static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid)
 221 {
 222         unsigned int tid;
 223
 224         if (this_is_starfire) {
 225                 tid = starfire_translate(imap, cpuid);
 226                 tid <<= IMAP_TID_SHIFT;
 227                 tid &= IMAP_TID_UPA;
 228         } else {
 229                 if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 230                         unsigned long ver;
 231
 232                         __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 233                         if ((ver >> 32UL) == __JALAPENO_ID ||
 234                             (ver >> 32UL) == __SERRANO_ID) {
 235                                 tid = cpuid << IMAP_TID_SHIFT;
 236                                 tid &= IMAP_TID_JBUS;
 237                         } else {
 238                                 unsigned int a = cpuid & 0x1f;
 239                                 unsigned int n = (cpuid >> 5) & 0x1f;
 240
 241                                 tid = ((a << IMAP_AID_SHIFT) |
 242                                        (n << IMAP_NID_SHIFT));
 243                                 tid &= (IMAP_AID_SAFARI |
 244                                         IMAP_NID_SAFARI);;
 245                         }
 246                 } else {
 247                         tid = cpuid << IMAP_TID_SHIFT;
 248                         tid &= IMAP_TID_UPA;
 249                 }
 250         }
 251
 252         return tid;
 253 }
 254
 255 struct irq_handler_data {
 256         unsigned long   iclr;
 257         unsigned long   imap;
 258
 259         void            (*pre_handler)(unsigned int, void *, void *);
 260         void            *arg1;
 261         void            *arg2;
 262 };
 263
 264 #ifdef CONFIG_SMP
 265 static int irq_choose_cpu(unsigned int virt_irq)
 266 {
 267         cpumask_t mask = irq_desc[virt_irq].affinity;
 268         int cpuid;
 269
 270         if (cpus_equal(mask, CPU_MASK_ALL)) {
 271                 static int irq_rover;
 272                 static DEFINE_SPINLOCK(irq_rover_lock);
 273                 unsigned long flags;
 274
 275                 /* Round-robin distribution... */
 276         do_round_robin:
 277                 spin_lock_irqsave(&irq_rover_lock, flags);
 278
 279                 while (!cpu_online(irq_rover)) {
 280                         if (++irq_rover >= NR_CPUS)
 281                                 irq_rover = 0;
 282                 }
 283                 cpuid = irq_rover;
 284                 do {
 285                         if (++irq_rover >= NR_CPUS)
 286                                 irq_rover = 0;
 287                 } while (!cpu_online(irq_rover));
 288
 289                 spin_unlock_irqrestore(&irq_rover_lock, flags);
 290         } else {
 291                 cpumask_t tmp;
 292
 293                 cpus_and(tmp, cpu_online_map, mask);
 294
 295                 if (cpus_empty(tmp))
 296                         goto do_round_robin;
 297
 298                 cpuid = first_cpu(tmp);
 299         }
 300
 301         return cpuid;
 302 }
 303 #else
 304 static int irq_choose_cpu(unsigned int virt_irq)
 305 {
 306         return real_hard_smp_processor_id();
 307 }
 308 #endif
 309
 310 static void sun4u_irq_enable(unsigned int virt_irq)
 311 {
 312         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 313
 314         if (likely(data)) {
 315                 unsigned long cpuid, imap, val;
 316                 unsigned int tid;
 317
 318                 cpuid = irq_choose_cpu(virt_irq);
 319                 imap = data->imap;
 320
 321                 tid = sun4u_compute_tid(imap, cpuid);
 322
 323                 val = upa_readq(imap);
 324                 val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS |
 325                          IMAP_AID_SAFARI | IMAP_NID_SAFARI);
 326                 val |= tid | IMAP_VALID;
 327                 upa_writeq(val, imap);
 328         }
 329 }
 330
 331 static void sun4u_set_affinity(unsigned int virt_irq, cpumask_t mask)
 332 {
 333         sun4u_irq_enable(virt_irq);
 334 }
 335
 336 static void sun4u_irq_disable(unsigned int virt_irq)
 337 {
 338         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 339
 340         if (likely(data)) {
 341                 unsigned long imap = data->imap;
 342                 unsigned long tmp = upa_readq(imap);
 343
 344                 tmp &= ~IMAP_VALID;
 345                 upa_writeq(tmp, imap);
 346         }
 347 }
 348
 349 static void sun4u_irq_eoi(unsigned int virt_irq)
 350 {
 351         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 352         struct irq_desc *desc = irq_desc + virt_irq;
 353
 354         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 355                 return;
 356
 357         if (likely(data))
 358                 upa_writeq(ICLR_IDLE, data->iclr);
 359 }
 360
 361 static void sun4v_irq_enable(unsigned int virt_irq)
 362 {
 363         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 364         unsigned long cpuid = irq_choose_cpu(virt_irq);
 365         int err;
 366
 367         err = sun4v_intr_settarget(ino, cpuid);
 368         if (err != HV_EOK)
 369                 printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
 370                        "err(%d)\n", ino, cpuid, err);
 371         err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 372         if (err != HV_EOK)
 373                 printk(KERN_ERR "sun4v_intr_setstate(%x): "
 374                        "err(%d)\n", ino, err);
 375         err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED);
 376         if (err != HV_EOK)
 377                 printk(KERN_ERR "sun4v_intr_setenabled(%x): err(%d)\n",
 378                        ino, err);
 379 }
 380
 381 static void sun4v_set_affinity(unsigned int virt_irq, cpumask_t mask)
 382 {
 383         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 384         unsigned long cpuid = irq_choose_cpu(virt_irq);
 385         int err;
 386
 387         err = sun4v_intr_settarget(ino, cpuid);
 388         if (err != HV_EOK)
 389                 printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
 390                        "err(%d)\n", ino, cpuid, err);
 391 }
 392
 393 static void sun4v_irq_disable(unsigned int virt_irq)
 394 {
 395         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 396         int err;
 397
 398         err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED);
 399         if (err != HV_EOK)
 400                 printk(KERN_ERR "sun4v_intr_setenabled(%x): "
 401                        "err(%d)\n", ino, err);
 402 }
 403
 404 static void sun4v_irq_eoi(unsigned int virt_irq)
 405 {
 406         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 407         struct irq_desc *desc = irq_desc + virt_irq;
 408         int err;
 409
 410         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 411                 return;
 412
 413         err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 414         if (err != HV_EOK)
 415                 printk(KERN_ERR "sun4v_intr_setstate(%x): "
 416                        "err(%d)\n", ino, err);
 417 }
 418
 419 static void sun4v_virq_enable(unsigned int virt_irq)
 420 {
 421         unsigned long cpuid, dev_handle, dev_ino;
 422         int err;
 423
 424         cpuid = irq_choose_cpu(virt_irq);
 425
 426         dev_handle = virt_irq_table[virt_irq].dev_handle;
 427         dev_ino = virt_irq_table[virt_irq].dev_ino;
 428
 429         err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
 430         if (err != HV_EOK)
 431                 printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
 432                        "err(%d)\n",
 433                        dev_handle, dev_ino, cpuid, err);
 434         err = sun4v_vintr_set_state(dev_handle, dev_ino,
 435                                     HV_INTR_STATE_IDLE);
 436         if (err != HV_EOK)
 437                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 438                        "HV_INTR_STATE_IDLE): err(%d)\n",
 439                        dev_handle, dev_ino, err);
 440         err = sun4v_vintr_set_valid(dev_handle, dev_ino,
 441                                     HV_INTR_ENABLED);
 442         if (err != HV_EOK)
 443                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 444                        "HV_INTR_ENABLED): err(%d)\n",
 445                        dev_handle, dev_ino, err);
 446 }
 447
 448 static void sun4v_virt_set_affinity(unsigned int virt_irq, cpumask_t mask)
 449 {
 450         unsigned long cpuid, dev_handle, dev_ino;
 451         int err;
 452
 453         cpuid = irq_choose_cpu(virt_irq);
 454
 455         dev_handle = virt_irq_table[virt_irq].dev_handle;
 456         dev_ino = virt_irq_table[virt_irq].dev_ino;
 457
 458         err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
 459         if (err != HV_EOK)
 460                 printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
 461                        "err(%d)\n",
 462                        dev_handle, dev_ino, cpuid, err);
 463 }
 464
 465 static void sun4v_virq_disable(unsigned int virt_irq)
 466 {
 467         unsigned long dev_handle, dev_ino;
 468         int err;
 469
 470         dev_handle = virt_irq_table[virt_irq].dev_handle;
 471         dev_ino = virt_irq_table[virt_irq].dev_ino;
 472
 473         err = sun4v_vintr_set_valid(dev_handle, dev_ino,
 474                                     HV_INTR_DISABLED);
 475         if (err != HV_EOK)
 476                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 477                        "HV_INTR_DISABLED): err(%d)\n",
 478                        dev_handle, dev_ino, err);
 479 }
 480
 481 static void sun4v_virq_eoi(unsigned int virt_irq)
 482 {
 483         struct irq_desc *desc = irq_desc + virt_irq;
 484         unsigned long dev_handle, dev_ino;
 485         int err;
 486
 487         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 488                 return;
 489
 490         dev_handle = virt_irq_table[virt_irq].dev_handle;
 491         dev_ino = virt_irq_table[virt_irq].dev_ino;
 492
 493         err = sun4v_vintr_set_state(dev_handle, dev_ino,
 494                                     HV_INTR_STATE_IDLE);
 495         if (err != HV_EOK)
 496                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 497                        "HV_INTR_STATE_IDLE): err(%d)\n",
 498                        dev_handle, dev_ino, err);
 499 }
 500
 501 static struct irq_chip sun4u_irq = {
 502         .typename       = "sun4u",
 503         .enable         = sun4u_irq_enable,
 504         .disable        = sun4u_irq_disable,
 505         .eoi            = sun4u_irq_eoi,
 506         .set_affinity   = sun4u_set_affinity,
 507 };
 508
 509 static struct irq_chip sun4v_irq = {
 510         .typename       = "sun4v",
 511         .enable         = sun4v_irq_enable,
 512         .disable        = sun4v_irq_disable,
 513         .eoi            = sun4v_irq_eoi,
 514         .set_affinity   = sun4v_set_affinity,
 515 };
 516
 517 static struct irq_chip sun4v_virq = {
 518         .typename       = "vsun4v",
 519         .enable         = sun4v_virq_enable,
 520         .disable        = sun4v_virq_disable,
 521         .eoi            = sun4v_virq_eoi,
 522         .set_affinity   = sun4v_virt_set_affinity,
 523 };
 524
 525 static void pre_flow_handler(unsigned int virt_irq,
 526                                       struct irq_desc *desc)
 527 {
 528         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 529         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 530
 531         data->pre_handler(ino, data->arg1, data->arg2);
 532
 533         handle_fasteoi_irq(virt_irq, desc);
 534 }
 535
 536 void irq_install_pre_handler(int virt_irq,
 537                              void (*func)(unsigned int, void *, void *),
 538                              void *arg1, void *arg2)
 539 {
 540         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 541         struct irq_desc *desc = irq_desc + virt_irq;
 542
 543         data->pre_handler = func;
 544         data->arg1 = arg1;
 545         data->arg2 = arg2;
 546
 547         desc->handle_irq = pre_flow_handler;
 548 }
 549
 550 unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
 551 {
 552         struct ino_bucket *bucket;
 553         struct irq_handler_data *data;
 554         unsigned int virt_irq;
 555         int ino;
 556
 557         BUG_ON(tlb_type == hypervisor);
 558
 559         ino = (upa_readq(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
 560         bucket = &ivector_table[ino];
 561         virt_irq = bucket_get_virt_irq(__pa(bucket));
 562         if (!virt_irq) {
 563                 virt_irq = virt_irq_alloc(0, ino);
 564                 bucket_set_virt_irq(__pa(bucket), virt_irq);
 565                 set_irq_chip_and_handler_name(virt_irq,
 566                                               &sun4u_irq,
 567                                               handle_fasteoi_irq,
 568                                               "IVEC");
 569         }
 570
 571         data = get_irq_chip_data(virt_irq);
 572         if (unlikely(data))
 573                 goto out;
 574
 575         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 576         if (unlikely(!data)) {
 577                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 578                 prom_halt();
 579         }
 580         set_irq_chip_data(virt_irq, data);
 581
 582         data->imap  = imap;
 583         data->iclr  = iclr;
 584
 585 out:
 586         return virt_irq;
 587 }
 588
 589 static unsigned int sun4v_build_common(unsigned long sysino,
 590                                        struct irq_chip *chip)
 591 {
 592         struct ino_bucket *bucket;
 593         struct irq_handler_data *data;
 594         unsigned int virt_irq;
 595
 596         BUG_ON(tlb_type != hypervisor);
 597
 598         bucket = &ivector_table[sysino];
 599         virt_irq = bucket_get_virt_irq(__pa(bucket));
 600         if (!virt_irq) {
 601                 virt_irq = virt_irq_alloc(0, sysino);
 602                 bucket_set_virt_irq(__pa(bucket), virt_irq);
 603                 set_irq_chip_and_handler_name(virt_irq, chip,
 604                                               handle_fasteoi_irq,
 605                                               "IVEC");
 606         }
 607
 608         data = get_irq_chip_data(virt_irq);
 609         if (unlikely(data))
 610                 goto out;
 611
 612         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 613         if (unlikely(!data)) {
 614                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 615                 prom_halt();
 616         }
 617         set_irq_chip_data(virt_irq, data);
 618
 619         /* Catch accidental accesses to these things.  IMAP/ICLR handling
 620          * is done by hypervisor calls on sun4v platforms, not by direct
 621          * register accesses.
 622          */
 623         data->imap = ~0UL;
 624         data->iclr = ~0UL;
 625
 626 out:
 627         return virt_irq;
 628 }
 629
 630 unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino)
 631 {
 632         unsigned long sysino = sun4v_devino_to_sysino(devhandle, devino);
 633
 634         return sun4v_build_common(sysino, &sun4v_irq);
 635 }
 636
 637 unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino)
 638 {
 639         struct irq_handler_data *data;
 640         struct ino_bucket *bucket;
 641         unsigned long hv_err, cookie;
 642         unsigned int virt_irq;
 643
 644         bucket = kzalloc(sizeof(struct ino_bucket), GFP_ATOMIC);
 645         if (unlikely(!bucket))
 646                 return 0;
 647         __flush_dcache_range((unsigned long) bucket,
 648                              ((unsigned long) bucket +
 649                               sizeof(struct ino_bucket)));
 650
 651         virt_irq = virt_irq_alloc(devhandle, devino);
 652         bucket_set_virt_irq(__pa(bucket), virt_irq);
 653
 654         set_irq_chip_and_handler_name(virt_irq, &sun4v_virq,
 655                                       handle_fasteoi_irq,
 656                                       "IVEC");
 657
 658         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 659         if (unlikely(!data))
 660                 return 0;
 661
 662         set_irq_chip_data(virt_irq, data);
 663
 664         /* Catch accidental accesses to these things.  IMAP/ICLR handling
 665          * is done by hypervisor calls on sun4v platforms, not by direct
 666          * register accesses.
 667          */
 668         data->imap = ~0UL;
 669         data->iclr = ~0UL;
 670
 671         cookie = ~__pa(bucket);
 672         hv_err = sun4v_vintr_set_cookie(devhandle, devino, cookie);
 673         if (hv_err) {
 674                 prom_printf("IRQ: Fatal, cannot set cookie for [%x:%x] "
 675                             "err=%lu\n", devhandle, devino, hv_err);
 676                 prom_halt();
 677         }
 678
 679         return virt_irq;
 680 }
 681
 682 void ack_bad_irq(unsigned int virt_irq)
 683 {
 684         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 685
 686         if (!ino)
 687                 ino = 0xdeadbeef;
 688
 689         printk(KERN_CRIT "Unexpected IRQ from ino[%x] virt_irq[%u]\n",
 690                ino, virt_irq);
 691 }
 692
 693 void handler_irq(int irq, struct pt_regs *regs)
 694 {
 695         unsigned long pstate, bucket_pa;
 696         struct pt_regs *old_regs;
 697
 698         clear_softint(1 << irq);
 699
 700         old_regs = set_irq_regs(regs);
 701         irq_enter();
 702
 703         /* Grab an atomic snapshot of the pending IVECs.  */
 704         __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
 705                              "wrpr      %0, %3, %%pstate\n\t"
 706                              "ldx       [%2], %1\n\t"
 707                              "stx       %%g0, [%2]\n\t"
 708                              "wrpr      %0, 0x0, %%pstate\n\t"
 709                              : "=&r" (pstate), "=&r" (bucket_pa)
 710                              : "r" (irq_work_pa(smp_processor_id())),
 711                                "i" (PSTATE_IE)
 712                              : "memory");
 713
 714         while (bucket_pa) {
 715                 struct irq_desc *desc;
 716                 unsigned long next_pa;
 717                 unsigned int virt_irq;
 718
 719                 next_pa = bucket_get_chain_pa(bucket_pa);
 720                 virt_irq = bucket_get_virt_irq(bucket_pa);
 721                 bucket_clear_chain_pa(bucket_pa);
 722
 723                 desc = irq_desc + virt_irq;
 724
 725                 desc->handle_irq(virt_irq, desc);
 726
 727                 bucket_pa = next_pa;
 728         }
 729
 730         irq_exit();
 731         set_irq_regs(old_regs);
 732 }
 733
 734 #ifdef CONFIG_HOTPLUG_CPU
 735 void fixup_irqs(void)
 736 {
 737         unsigned int irq;
 738
 739         for (irq = 0; irq < NR_IRQS; irq++) {
 740                 unsigned long flags;
 741
 742                 spin_lock_irqsave(&irq_desc[irq].lock, flags);
 743                 if (irq_desc[irq].action &&
 744                     !(irq_desc[irq].status & IRQ_PER_CPU)) {
 745                         if (irq_desc[irq].chip->set_affinity)
 746                                 irq_desc[irq].chip->set_affinity(irq,
 747                                         irq_desc[irq].affinity);
 748                 }
 749                 spin_unlock_irqrestore(&irq_desc[irq].lock, flags);
 750         }
 751 }
 752 #endif
 753
 754 struct sun5_timer {
 755         u64     count0;
 756         u64     limit0;
 757         u64     count1;
 758         u64     limit1;
 759 };
 760
 761 static struct sun5_timer *prom_timers;
 762 static u64 prom_limit0, prom_limit1;
 763
 764 static void map_prom_timers(void)
 765 {
 766         struct device_node *dp;
 767         const unsigned int *addr;
 768
 769         /* PROM timer node hangs out in the top level of device siblings... */
 770         dp = of_find_node_by_path("/");
 771         dp = dp->child;
 772         while (dp) {
 773                 if (!strcmp(dp->name, "counter-timer"))
 774                         break;
 775                 dp = dp->sibling;
 776         }
 777
 778         /* Assume if node is not present, PROM uses different tick mechanism
 779          * which we should not care about.
 780          */
 781         if (!dp) {
 782                 prom_timers = (struct sun5_timer *) 0;
 783                 return;
 784         }
 785
 786         /* If PROM is really using this, it must be mapped by him. */
 787         addr = of_get_property(dp, "address", NULL);
 788         if (!addr) {
 789                 prom_printf("PROM does not have timer mapped, trying to continue.\n");
 790                 prom_timers = (struct sun5_timer *) 0;
 791                 return;
 792         }
 793         prom_timers = (struct sun5_timer *) ((unsigned long)addr[0]);
 794 }
 795
 796 static void kill_prom_timer(void)
 797 {
 798         if (!prom_timers)
 799                 return;
 800
 801         /* Save them away for later. */
 802         prom_limit0 = prom_timers->limit0;
 803         prom_limit1 = prom_timers->limit1;
 804
 805         /* Just as in sun4c/sun4m PROM uses timer which ticks at IRQ 14.
 806          * We turn both off here just to be paranoid.
 807          */
 808         prom_timers->limit0 = 0;
 809         prom_timers->limit1 = 0;
 810
 811         /* Wheee, eat the interrupt packet too... */
 812         __asm__ __volatile__(
 813 "       mov     0x40, %%g2\n"
 814 "       ldxa    [%%g0] %0, %%g1\n"
 815 "       ldxa    [%%g2] %1, %%g1\n"
 816 "       stxa    %%g0, [%%g0] %0\n"
 817 "       membar  #Sync\n"
 818         : /* no outputs */
 819         : "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R)
 820         : "g1", "g2");
 821 }
 822
 823 void init_irqwork_curcpu(void)
 824 {
 825         int cpu = hard_smp_processor_id();
 826
 827         trap_block[cpu].irq_worklist_pa = 0UL;
 828 }
 829
 830 /* Please be very careful with register_one_mondo() and
 831  * sun4v_register_mondo_queues().
 832  *
 833  * On SMP this gets invoked from the CPU trampoline before
 834  * the cpu has fully taken over the trap table from OBP,
 835  * and it's kernel stack + %g6 thread register state is
 836  * not fully cooked yet.
 837  *
 838  * Therefore you cannot make any OBP calls, not even prom_printf,
 839  * from these two routines.
 840  */
 841 static void __cpuinit register_one_mondo(unsigned long paddr, unsigned long type, unsigned long qmask)
 842 {
 843         unsigned long num_entries = (qmask + 1) / 64;
 844         unsigned long status;
 845
 846         status = sun4v_cpu_qconf(type, paddr, num_entries);
 847         if (status != HV_EOK) {
 848                 prom_printf("SUN4V: sun4v_cpu_qconf(%lu:%lx:%lu) failed, "
 849                             "err %lu\n", type, paddr, num_entries, status);
 850                 prom_halt();
 851         }
 852 }
 853
 854 void __cpuinit sun4v_register_mondo_queues(int this_cpu)
 855 {
 856         struct trap_per_cpu *tb = &trap_block[this_cpu];
 857
 858         register_one_mondo(tb->cpu_mondo_pa, HV_CPU_QUEUE_CPU_MONDO,
 859                            tb->cpu_mondo_qmask);
 860         register_one_mondo(tb->dev_mondo_pa, HV_CPU_QUEUE_DEVICE_MONDO,
 861                            tb->dev_mondo_qmask);
 862         register_one_mondo(tb->resum_mondo_pa, HV_CPU_QUEUE_RES_ERROR,
 863                            tb->resum_qmask);
 864         register_one_mondo(tb->nonresum_mondo_pa, HV_CPU_QUEUE_NONRES_ERROR,
 865                            tb->nonresum_qmask);
 866 }
 867
 868 static void __init alloc_one_mondo(unsigned long *pa_ptr, unsigned long qmask)
 869 {
 870         unsigned long size = PAGE_ALIGN(qmask + 1);
 871         void *p = __alloc_bootmem(size, size, 0);
 872         if (!p) {
 873                 prom_printf("SUN4V: Error, cannot allocate mondo queue.\n");
 874                 prom_halt();
 875         }
 876
 877         *pa_ptr = __pa(p);
 878 }
 879
 880 static void __init alloc_one_kbuf(unsigned long *pa_ptr, unsigned long qmask)
 881 {
 882         unsigned long size = PAGE_ALIGN(qmask + 1);
 883         void *p = __alloc_bootmem(size, size, 0);
 884
 885         if (!p) {
 886                 prom_printf("SUN4V: Error, cannot allocate kbuf page.\n");
 887                 prom_halt();
 888         }
 889
 890         *pa_ptr = __pa(p);
 891 }
 892
 893 static void __init init_cpu_send_mondo_info(struct trap_per_cpu *tb)
 894 {
 895 #ifdef CONFIG_SMP
 896         void *page;
 897
 898         BUILD_BUG_ON((NR_CPUS * sizeof(u16)) > (PAGE_SIZE - 64));
 899
 900         page = alloc_bootmem_pages(PAGE_SIZE);
 901         if (!page) {
 902                 prom_printf("SUN4V: Error, cannot allocate cpu mondo page.\n");
 903                 prom_halt();
 904         }
 905
 906         tb->cpu_mondo_block_pa = __pa(page);
 907         tb->cpu_list_pa = __pa(page + 64);
 908 #endif
 909 }
 910
 911 /* Allocate mondo and error queues for all possible cpus.  */
 912 static void __init sun4v_init_mondo_queues(void)
 913 {
 914         int cpu;
 915
 916         for_each_possible_cpu(cpu) {
 917                 struct trap_per_cpu *tb = &trap_block[cpu];
 918
 919                 alloc_one_mondo(&tb->cpu_mondo_pa, tb->cpu_mondo_qmask);
 920                 alloc_one_mondo(&tb->dev_mondo_pa, tb->dev_mondo_qmask);
 921                 alloc_one_mondo(&tb->resum_mondo_pa, tb->resum_qmask);
 922                 alloc_one_kbuf(&tb->resum_kernel_buf_pa, tb->resum_qmask);
 923                 alloc_one_mondo(&tb->nonresum_mondo_pa, tb->nonresum_qmask);
 924                 alloc_one_kbuf(&tb->nonresum_kernel_buf_pa,
 925                                tb->nonresum_qmask);
 926
 927                 init_cpu_send_mondo_info(tb);
 928         }
 929
 930         /* Load up the boot cpu's entries.  */
 931         sun4v_register_mondo_queues(hard_smp_processor_id());
 932 }
 933
 934 static struct irqaction timer_irq_action = {
 935         .name = "timer",
 936 };
 937
 938 /* Only invoked on boot processor. */
 939 void __init init_IRQ(void)
 940 {
 941         unsigned long size;
 942
 943         map_prom_timers();
 944         kill_prom_timer();
 945
 946         size = sizeof(struct ino_bucket) * NUM_IVECS;
 947         ivector_table = alloc_bootmem(size);
 948         if (!ivector_table) {
 949                 prom_printf("Fatal error, cannot allocate ivector_table\n");
 950                 prom_halt();
 951         }
 952         __flush_dcache_range((unsigned long) ivector_table,
 953                              ((unsigned long) ivector_table) + size);
 954
 955         ivector_table_pa = __pa(ivector_table);
 956
 957         if (tlb_type == hypervisor)
 958                 sun4v_init_mondo_queues();
 959
 960         /* We need to clear any IRQ's pending in the soft interrupt
 961          * registers, a spurious one could be left around from the
 962          * PROM timer which we just disabled.
 963          */
 964         clear_softint(get_softint());
 965
 966         /* Now that ivector table is initialized, it is safe
 967          * to receive IRQ vector traps.  We will normally take
 968          * one or two right now, in case some device PROM used
 969          * to boot us wants to speak to us.  We just ignore them.
 970          */
 971         __asm__ __volatile__("rdpr      %%pstate, %%g1\n\t"
 972                              "or        %%g1, %0, %%g1\n\t"
 973                              "wrpr      %%g1, 0x0, %%pstate"
 974                              : /* No outputs */
 975                              : "i" (PSTATE_IE)
 976                              : "g1");
 977
 978         irq_desc[0].action = &timer_irq_action;
 979 }