err.no Git - linux-2.6/blob - 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
  46 /* UPA nodes send interrupt packet to UltraSparc with first data reg
  47  * value low 5 (7 on Starfire) bits holding the IRQ identifier being
  48  * delivered.  We must translate this into a non-vector IRQ so we can
  49  * set the softint on this cpu.
  50  *
  51  * To make processing these packets efficient and race free we use
  52  * an array of irq buckets below.  The interrupt vector handler in
  53  * entry.S feeds incoming packets into per-cpu pil-indexed lists.
  54  * The IVEC handler does not need to act atomically, the PIL dispatch
  55  * code uses CAS to get an atomic snapshot of the list and clear it
  56  * at the same time.
  57  *
  58  * If you make changes to ino_bucket, please update hand coded assembler
  59  * of the vectored interrupt trap handler(s) in entry.S and sun4v_ivec.S
  60  */
  61 struct ino_bucket {
  62         /* Next handler in per-CPU IRQ worklist.  We know that
  63          * bucket pointers have the high 32-bits clear, so to
  64          * save space we only store the bits we need.
  65          */
  66 /*0x00*/unsigned int irq_chain;
  67
  68         /* Virtual interrupt number assigned to this INO.  */
  69 /*0x04*/unsigned int virt_irq;
  70 };
  71
  72 #define NUM_IVECS       (IMAP_INR + 1)
  73 struct ino_bucket ivector_table[NUM_IVECS] __attribute__ ((aligned (SMP_CACHE_BYTES)));
  74
  75 #define __irq_ino(irq) \
  76         (((struct ino_bucket *)(unsigned long)(irq)) - &ivector_table[0])
  77 #define __bucket(irq) ((struct ino_bucket *)(unsigned long)(irq))
  78 #define __irq(bucket) ((unsigned int)(unsigned long)(bucket))
  79
  80 /* This has to be in the main kernel image, it cannot be
  81  * turned into per-cpu data.  The reason is that the main
  82  * kernel image is locked into the TLB and this structure
  83  * is accessed from the vectored interrupt trap handler.  If
  84  * access to this structure takes a TLB miss it could cause
  85  * the 5-level sparc v9 trap stack to overflow.
  86  */
  87 #define irq_work(__cpu) &(trap_block[(__cpu)].irq_worklist)
  88
  89 static struct {
  90         unsigned int irq;
  91         unsigned int dev_handle;
  92         unsigned int dev_ino;
  93 } virt_to_real_irq_table[NR_IRQS];
  94 static DEFINE_SPINLOCK(virt_irq_alloc_lock);
  95
  96 unsigned char virt_irq_alloc(unsigned int real_irq)
  97 {
  98         unsigned long flags;
  99         unsigned char ent;
 100
 101         BUILD_BUG_ON(NR_IRQS >= 256);
 102
 103         spin_lock_irqsave(&virt_irq_alloc_lock, flags);
 104
 105         for (ent = 1; ent < NR_IRQS; ent++) {
 106                 if (!virt_to_real_irq_table[ent].irq)
 107                         break;
 108         }
 109         if (ent >= NR_IRQS) {
 110                 printk(KERN_ERR "IRQ: Out of virtual IRQs.\n");
 111                 ent = 0;
 112         } else {
 113                 virt_to_real_irq_table[ent].irq = real_irq;
 114         }
 115
 116         spin_unlock_irqrestore(&virt_irq_alloc_lock, flags);
 117
 118         return ent;
 119 }
 120
 121 #ifdef CONFIG_PCI_MSI
 122 void virt_irq_free(unsigned int virt_irq)
 123 {
 124         unsigned long flags;
 125
 126         if (virt_irq >= NR_IRQS)
 127                 return;
 128
 129         spin_lock_irqsave(&virt_irq_alloc_lock, flags);
 130
 131         virt_to_real_irq_table[virt_irq].irq = 0;
 132
 133         spin_unlock_irqrestore(&virt_irq_alloc_lock, flags);
 134 }
 135 #endif
 136
 137 static unsigned int virt_to_real_irq(unsigned char virt_irq)
 138 {
 139         return virt_to_real_irq_table[virt_irq].irq;
 140 }
 141
 142 /*
 143  * /proc/interrupts printing:
 144  */
 145
 146 int show_interrupts(struct seq_file *p, void *v)
 147 {
 148         int i = *(loff_t *) v, j;
 149         struct irqaction * action;
 150         unsigned long flags;
 151
 152         if (i == 0) {
 153                 seq_printf(p, "           ");
 154                 for_each_online_cpu(j)
 155                         seq_printf(p, "CPU%d       ",j);
 156                 seq_putc(p, '\n');
 157         }
 158
 159         if (i < NR_IRQS) {
 160                 spin_lock_irqsave(&irq_desc[i].lock, flags);
 161                 action = irq_desc[i].action;
 162                 if (!action)
 163                         goto skip;
 164                 seq_printf(p, "%3d: ",i);
 165 #ifndef CONFIG_SMP
 166                 seq_printf(p, "%10u ", kstat_irqs(i));
 167 #else
 168                 for_each_online_cpu(j)
 169                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
 170 #endif
 171                 seq_printf(p, " %9s", irq_desc[i].chip->typename);
 172                 seq_printf(p, "  %s", action->name);
 173
 174                 for (action=action->next; action; action = action->next)
 175                         seq_printf(p, ", %s", action->name);
 176
 177                 seq_putc(p, '\n');
 178 skip:
 179                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 180         }
 181         return 0;
 182 }
 183
 184 static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid)
 185 {
 186         unsigned int tid;
 187
 188         if (this_is_starfire) {
 189                 tid = starfire_translate(imap, cpuid);
 190                 tid <<= IMAP_TID_SHIFT;
 191                 tid &= IMAP_TID_UPA;
 192         } else {
 193                 if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 194                         unsigned long ver;
 195
 196                         __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 197                         if ((ver >> 32UL) == __JALAPENO_ID ||
 198                             (ver >> 32UL) == __SERRANO_ID) {
 199                                 tid = cpuid << IMAP_TID_SHIFT;
 200                                 tid &= IMAP_TID_JBUS;
 201                         } else {
 202                                 unsigned int a = cpuid & 0x1f;
 203                                 unsigned int n = (cpuid >> 5) & 0x1f;
 204
 205                                 tid = ((a << IMAP_AID_SHIFT) |
 206                                        (n << IMAP_NID_SHIFT));
 207                                 tid &= (IMAP_AID_SAFARI |
 208                                         IMAP_NID_SAFARI);;
 209                         }
 210                 } else {
 211                         tid = cpuid << IMAP_TID_SHIFT;
 212                         tid &= IMAP_TID_UPA;
 213                 }
 214         }
 215
 216         return tid;
 217 }
 218
 219 struct irq_handler_data {
 220         unsigned long   iclr;
 221         unsigned long   imap;
 222
 223         void            (*pre_handler)(unsigned int, void *, void *);
 224         void            *pre_handler_arg1;
 225         void            *pre_handler_arg2;
 226 };
 227
 228 static inline struct ino_bucket *virt_irq_to_bucket(unsigned int virt_irq)
 229 {
 230         unsigned int real_irq = virt_to_real_irq(virt_irq);
 231         struct ino_bucket *bucket = NULL;
 232
 233         if (likely(real_irq))
 234                 bucket = __bucket(real_irq);
 235
 236         return bucket;
 237 }
 238
 239 #ifdef CONFIG_SMP
 240 static int irq_choose_cpu(unsigned int virt_irq)
 241 {
 242         cpumask_t mask = irq_desc[virt_irq].affinity;
 243         int cpuid;
 244
 245         if (cpus_equal(mask, CPU_MASK_ALL)) {
 246                 static int irq_rover;
 247                 static DEFINE_SPINLOCK(irq_rover_lock);
 248                 unsigned long flags;
 249
 250                 /* Round-robin distribution... */
 251         do_round_robin:
 252                 spin_lock_irqsave(&irq_rover_lock, flags);
 253
 254                 while (!cpu_online(irq_rover)) {
 255                         if (++irq_rover >= NR_CPUS)
 256                                 irq_rover = 0;
 257                 }
 258                 cpuid = irq_rover;
 259                 do {
 260                         if (++irq_rover >= NR_CPUS)
 261                                 irq_rover = 0;
 262                 } while (!cpu_online(irq_rover));
 263
 264                 spin_unlock_irqrestore(&irq_rover_lock, flags);
 265         } else {
 266                 cpumask_t tmp;
 267
 268                 cpus_and(tmp, cpu_online_map, mask);
 269
 270                 if (cpus_empty(tmp))
 271                         goto do_round_robin;
 272
 273                 cpuid = first_cpu(tmp);
 274         }
 275
 276         return cpuid;
 277 }
 278 #else
 279 static int irq_choose_cpu(unsigned int virt_irq)
 280 {
 281         return real_hard_smp_processor_id();
 282 }
 283 #endif
 284
 285 static void sun4u_irq_enable(unsigned int virt_irq)
 286 {
 287         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 288
 289         if (likely(data)) {
 290                 unsigned long cpuid, imap, val;
 291                 unsigned int tid;
 292
 293                 cpuid = irq_choose_cpu(virt_irq);
 294                 imap = data->imap;
 295
 296                 tid = sun4u_compute_tid(imap, cpuid);
 297
 298                 val = upa_readq(imap);
 299                 val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS |
 300                          IMAP_AID_SAFARI | IMAP_NID_SAFARI);
 301                 val |= tid | IMAP_VALID;
 302                 upa_writeq(val, imap);
 303         }
 304 }
 305
 306 static void sun4u_set_affinity(unsigned int virt_irq, cpumask_t mask)
 307 {
 308         sun4u_irq_enable(virt_irq);
 309 }
 310
 311 static void sun4u_irq_disable(unsigned int virt_irq)
 312 {
 313         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 314
 315         if (likely(data)) {
 316                 unsigned long imap = data->imap;
 317                 unsigned long tmp = upa_readq(imap);
 318
 319                 tmp &= ~IMAP_VALID;
 320                 upa_writeq(tmp, imap);
 321         }
 322 }
 323
 324 static void sun4u_irq_end(unsigned int virt_irq)
 325 {
 326         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 327         struct irq_desc *desc = irq_desc + virt_irq;
 328
 329         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 330                 return;
 331
 332         if (likely(data))
 333                 upa_writeq(ICLR_IDLE, data->iclr);
 334 }
 335
 336 static void sun4v_irq_enable(unsigned int virt_irq)
 337 {
 338         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 339         unsigned int ino = bucket - &ivector_table[0];
 340
 341         if (likely(bucket)) {
 342                 unsigned long cpuid;
 343                 int err;
 344
 345                 cpuid = irq_choose_cpu(virt_irq);
 346
 347                 err = sun4v_intr_settarget(ino, cpuid);
 348                 if (err != HV_EOK)
 349                         printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
 350                                "err(%d)\n", ino, cpuid, err);
 351                 err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 352                 if (err != HV_EOK)
 353                         printk(KERN_ERR "sun4v_intr_setstate(%x): "
 354                                "err(%d)\n", ino, err);
 355                 err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED);
 356                 if (err != HV_EOK)
 357                         printk(KERN_ERR "sun4v_intr_setenabled(%x): err(%d)\n",
 358                                ino, err);
 359         }
 360 }
 361
 362 static void sun4v_set_affinity(unsigned int virt_irq, cpumask_t mask)
 363 {
 364         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 365         unsigned int ino = bucket - &ivector_table[0];
 366
 367         if (likely(bucket)) {
 368                 unsigned long cpuid;
 369                 int err;
 370
 371                 cpuid = irq_choose_cpu(virt_irq);
 372
 373                 err = sun4v_intr_settarget(ino, cpuid);
 374                 if (err != HV_EOK)
 375                         printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
 376                                "err(%d)\n", ino, cpuid, err);
 377         }
 378 }
 379
 380 static void sun4v_irq_disable(unsigned int virt_irq)
 381 {
 382         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 383         unsigned int ino = bucket - &ivector_table[0];
 384
 385         if (likely(bucket)) {
 386                 int err;
 387
 388                 err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED);
 389                 if (err != HV_EOK)
 390                         printk(KERN_ERR "sun4v_intr_setenabled(%x): "
 391                                "err(%d)\n", ino, err);
 392         }
 393 }
 394
 395 static void sun4v_irq_end(unsigned int virt_irq)
 396 {
 397         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 398         unsigned int ino = bucket - &ivector_table[0];
 399         struct irq_desc *desc = irq_desc + virt_irq;
 400
 401         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 402                 return;
 403
 404         if (likely(bucket)) {
 405                 int err;
 406
 407                 err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 408                 if (err != HV_EOK)
 409                         printk(KERN_ERR "sun4v_intr_setstate(%x): "
 410                                "err(%d)\n", ino, err);
 411         }
 412 }
 413
 414 static void sun4v_virq_enable(unsigned int virt_irq)
 415 {
 416         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 417
 418         if (likely(bucket)) {
 419                 unsigned long cpuid, dev_handle, dev_ino;
 420                 int err;
 421
 422                 cpuid = irq_choose_cpu(virt_irq);
 423
 424                 dev_handle = virt_to_real_irq_table[virt_irq].dev_handle;
 425                 dev_ino = virt_to_real_irq_table[virt_irq].dev_ino;
 426
 427                 err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
 428                 if (err != HV_EOK)
 429                         printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
 430                                "err(%d)\n",
 431                                dev_handle, dev_ino, cpuid, err);
 432                 err = sun4v_vintr_set_state(dev_handle, dev_ino,
 433                                             HV_INTR_STATE_IDLE);
 434                 if (err != HV_EOK)
 435                         printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 436                                 "HV_INTR_STATE_IDLE): err(%d)\n",
 437                                dev_handle, dev_ino, err);
 438                 err = sun4v_vintr_set_valid(dev_handle, dev_ino,
 439                                             HV_INTR_ENABLED);
 440                 if (err != HV_EOK)
 441                         printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 442                                "HV_INTR_ENABLED): err(%d)\n",
 443                                dev_handle, dev_ino, err);
 444         }
 445 }
 446
 447 static void sun4v_virt_set_affinity(unsigned int virt_irq, cpumask_t mask)
 448 {
 449         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 450
 451         if (likely(bucket)) {
 452                 unsigned long cpuid, dev_handle, dev_ino;
 453                 int err;
 454
 455                 cpuid = irq_choose_cpu(virt_irq);
 456
 457                 dev_handle = virt_to_real_irq_table[virt_irq].dev_handle;
 458                 dev_ino = virt_to_real_irq_table[virt_irq].dev_ino;
 459
 460                 err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
 461                 if (err != HV_EOK)
 462                         printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
 463                                "err(%d)\n",
 464                                dev_handle, dev_ino, cpuid, err);
 465         }
 466 }
 467
 468 static void sun4v_virq_disable(unsigned int virt_irq)
 469 {
 470         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 471
 472         if (likely(bucket)) {
 473                 unsigned long dev_handle, dev_ino;
 474                 int err;
 475
 476                 dev_handle = virt_to_real_irq_table[virt_irq].dev_handle;
 477                 dev_ino = virt_to_real_irq_table[virt_irq].dev_ino;
 478
 479                 err = sun4v_vintr_set_valid(dev_handle, dev_ino,
 480                                             HV_INTR_DISABLED);
 481                 if (err != HV_EOK)
 482                         printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 483                                "HV_INTR_DISABLED): err(%d)\n",
 484                                dev_handle, dev_ino, err);
 485         }
 486 }
 487
 488 static void sun4v_virq_end(unsigned int virt_irq)
 489 {
 490         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 491         struct irq_desc *desc = irq_desc + virt_irq;
 492
 493         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 494                 return;
 495
 496         if (likely(bucket)) {
 497                 unsigned long dev_handle, dev_ino;
 498                 int err;
 499
 500                 dev_handle = virt_to_real_irq_table[virt_irq].dev_handle;
 501                 dev_ino = virt_to_real_irq_table[virt_irq].dev_ino;
 502
 503                 err = sun4v_vintr_set_state(dev_handle, dev_ino,
 504                                             HV_INTR_STATE_IDLE);
 505                 if (err != HV_EOK)
 506                         printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 507                                 "HV_INTR_STATE_IDLE): err(%d)\n",
 508                                dev_handle, dev_ino, err);
 509         }
 510 }
 511
 512 static void run_pre_handler(unsigned int virt_irq)
 513 {
 514         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 515         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 516
 517         if (likely(data->pre_handler)) {
 518                 data->pre_handler(__irq_ino(__irq(bucket)),
 519                                   data->pre_handler_arg1,
 520                                   data->pre_handler_arg2);
 521         }
 522 }
 523
 524 static struct irq_chip sun4u_irq = {
 525         .typename       = "sun4u",
 526         .enable         = sun4u_irq_enable,
 527         .disable        = sun4u_irq_disable,
 528         .end            = sun4u_irq_end,
 529         .set_affinity   = sun4u_set_affinity,
 530 };
 531
 532 static struct irq_chip sun4u_irq_ack = {
 533         .typename       = "sun4u+ack",
 534         .enable         = sun4u_irq_enable,
 535         .disable        = sun4u_irq_disable,
 536         .ack            = run_pre_handler,
 537         .end            = sun4u_irq_end,
 538         .set_affinity   = sun4u_set_affinity,
 539 };
 540
 541 static struct irq_chip sun4v_irq = {
 542         .typename       = "sun4v",
 543         .enable         = sun4v_irq_enable,
 544         .disable        = sun4v_irq_disable,
 545         .end            = sun4v_irq_end,
 546         .set_affinity   = sun4v_set_affinity,
 547 };
 548
 549 static struct irq_chip sun4v_virq = {
 550         .typename       = "vsun4v",
 551         .enable         = sun4v_virq_enable,
 552         .disable        = sun4v_virq_disable,
 553         .end            = sun4v_virq_end,
 554         .set_affinity   = sun4v_virt_set_affinity,
 555 };
 556
 557 void irq_install_pre_handler(int virt_irq,
 558                              void (*func)(unsigned int, void *, void *),
 559                              void *arg1, void *arg2)
 560 {
 561         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 562         struct irq_chip *chip = get_irq_chip(virt_irq);
 563
 564         if (WARN_ON(chip == &sun4v_irq || chip == &sun4v_virq)) {
 565                 printk(KERN_ERR "IRQ: Trying to install pre-handler on "
 566                        "sun4v irq %u\n", virt_irq);
 567                 return;
 568         }
 569
 570         data->pre_handler = func;
 571         data->pre_handler_arg1 = arg1;
 572         data->pre_handler_arg2 = arg2;
 573
 574         if (chip == &sun4u_irq_ack)
 575                 return;
 576
 577         set_irq_chip(virt_irq, &sun4u_irq_ack);
 578 }
 579
 580 unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
 581 {
 582         struct ino_bucket *bucket;
 583         struct irq_handler_data *data;
 584         int ino;
 585
 586         BUG_ON(tlb_type == hypervisor);
 587
 588         ino = (upa_readq(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
 589         bucket = &ivector_table[ino];
 590         if (!bucket->virt_irq) {
 591                 bucket->virt_irq = virt_irq_alloc(__irq(bucket));
 592                 set_irq_chip(bucket->virt_irq, &sun4u_irq);
 593         }
 594
 595         data = get_irq_chip_data(bucket->virt_irq);
 596         if (unlikely(data))
 597                 goto out;
 598
 599         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 600         if (unlikely(!data)) {
 601                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 602                 prom_halt();
 603         }
 604         set_irq_chip_data(bucket->virt_irq, data);
 605
 606         data->imap  = imap;
 607         data->iclr  = iclr;
 608
 609 out:
 610         return bucket->virt_irq;
 611 }
 612
 613 static unsigned int sun4v_build_common(unsigned long sysino,
 614                                        struct irq_chip *chip)
 615 {
 616         struct ino_bucket *bucket;
 617         struct irq_handler_data *data;
 618
 619         BUG_ON(tlb_type != hypervisor);
 620
 621         bucket = &ivector_table[sysino];
 622         if (!bucket->virt_irq) {
 623                 bucket->virt_irq = virt_irq_alloc(__irq(bucket));
 624                 set_irq_chip(bucket->virt_irq, chip);
 625         }
 626
 627         data = get_irq_chip_data(bucket->virt_irq);
 628         if (unlikely(data))
 629                 goto out;
 630
 631         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 632         if (unlikely(!data)) {
 633                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 634                 prom_halt();
 635         }
 636         set_irq_chip_data(bucket->virt_irq, data);
 637
 638         /* Catch accidental accesses to these things.  IMAP/ICLR handling
 639          * is done by hypervisor calls on sun4v platforms, not by direct
 640          * register accesses.
 641          */
 642         data->imap = ~0UL;
 643         data->iclr = ~0UL;
 644
 645 out:
 646         return bucket->virt_irq;
 647 }
 648
 649 unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino)
 650 {
 651         unsigned long sysino = sun4v_devino_to_sysino(devhandle, devino);
 652
 653         return sun4v_build_common(sysino, &sun4v_irq);
 654 }
 655
 656 unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino)
 657 {
 658         unsigned long sysino, hv_err;
 659         unsigned int virq;
 660
 661         BUG_ON(devhandle & devino);
 662
 663         sysino = devhandle | devino;
 664         BUG_ON(sysino & ~(IMAP_IGN | IMAP_INO));
 665
 666         hv_err = sun4v_vintr_set_cookie(devhandle, devino, sysino);
 667         if (hv_err) {
 668                 prom_printf("IRQ: Fatal, cannot set cookie for [%x:%x] "
 669                             "err=%lu\n", devhandle, devino, hv_err);
 670                 prom_halt();
 671         }
 672
 673         virq = sun4v_build_common(sysino, &sun4v_virq);
 674
 675         virt_to_real_irq_table[virq].dev_handle = devhandle;
 676         virt_to_real_irq_table[virq].dev_ino = devino;
 677
 678         return virq;
 679 }
 680
 681 void ack_bad_irq(unsigned int virt_irq)
 682 {
 683         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 684         unsigned int ino = 0xdeadbeef;
 685
 686         if (bucket)
 687                 ino = bucket - &ivector_table[0];
 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         struct ino_bucket *bucket;
 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         /* Sliiiick... */
 704         bucket = __bucket(xchg32(irq_work(smp_processor_id()), 0));
 705         while (bucket) {
 706                 struct ino_bucket *next = __bucket(bucket->irq_chain);
 707
 708                 bucket->irq_chain = 0;
 709                 __do_IRQ(bucket->virt_irq);
 710
 711                 bucket = next;
 712         }
 713
 714         irq_exit();
 715         set_irq_regs(old_regs);
 716 }
 717
 718 #ifdef CONFIG_HOTPLUG_CPU
 719 void fixup_irqs(void)
 720 {
 721         unsigned int irq;
 722
 723         for (irq = 0; irq < NR_IRQS; irq++) {
 724                 unsigned long flags;
 725
 726                 spin_lock_irqsave(&irq_desc[irq].lock, flags);
 727                 if (irq_desc[irq].action &&
 728                     !(irq_desc[irq].status & IRQ_PER_CPU)) {
 729                         if (irq_desc[irq].chip->set_affinity)
 730                                 irq_desc[irq].chip->set_affinity(irq,
 731                                         irq_desc[irq].affinity);
 732                 }
 733                 spin_unlock_irqrestore(&irq_desc[irq].lock, flags);
 734         }
 735 }
 736 #endif
 737
 738 struct sun5_timer {
 739         u64     count0;
 740         u64     limit0;
 741         u64     count1;
 742         u64     limit1;
 743 };
 744
 745 static struct sun5_timer *prom_timers;
 746 static u64 prom_limit0, prom_limit1;
 747
 748 static void map_prom_timers(void)
 749 {
 750         struct device_node *dp;
 751         const unsigned int *addr;
 752
 753         /* PROM timer node hangs out in the top level of device siblings... */
 754         dp = of_find_node_by_path("/");
 755         dp = dp->child;
 756         while (dp) {
 757                 if (!strcmp(dp->name, "counter-timer"))
 758                         break;
 759                 dp = dp->sibling;
 760         }
 761
 762         /* Assume if node is not present, PROM uses different tick mechanism
 763          * which we should not care about.
 764          */
 765         if (!dp) {
 766                 prom_timers = (struct sun5_timer *) 0;
 767                 return;
 768         }
 769
 770         /* If PROM is really using this, it must be mapped by him. */
 771         addr = of_get_property(dp, "address", NULL);
 772         if (!addr) {
 773                 prom_printf("PROM does not have timer mapped, trying to continue.\n");
 774                 prom_timers = (struct sun5_timer *) 0;
 775                 return;
 776         }
 777         prom_timers = (struct sun5_timer *) ((unsigned long)addr[0]);
 778 }
 779
 780 static void kill_prom_timer(void)
 781 {
 782         if (!prom_timers)
 783                 return;
 784
 785         /* Save them away for later. */
 786         prom_limit0 = prom_timers->limit0;
 787         prom_limit1 = prom_timers->limit1;
 788
 789         /* Just as in sun4c/sun4m PROM uses timer which ticks at IRQ 14.
 790          * We turn both off here just to be paranoid.
 791          */
 792         prom_timers->limit0 = 0;
 793         prom_timers->limit1 = 0;
 794
 795         /* Wheee, eat the interrupt packet too... */
 796         __asm__ __volatile__(
 797 "       mov     0x40, %%g2\n"
 798 "       ldxa    [%%g0] %0, %%g1\n"
 799 "       ldxa    [%%g2] %1, %%g1\n"
 800 "       stxa    %%g0, [%%g0] %0\n"
 801 "       membar  #Sync\n"
 802         : /* no outputs */
 803         : "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R)
 804         : "g1", "g2");
 805 }
 806
 807 void init_irqwork_curcpu(void)
 808 {
 809         int cpu = hard_smp_processor_id();
 810
 811         trap_block[cpu].irq_worklist = 0;
 812 }
 813
 814 /* Please be very careful with register_one_mondo() and
 815  * sun4v_register_mondo_queues().
 816  *
 817  * On SMP this gets invoked from the CPU trampoline before
 818  * the cpu has fully taken over the trap table from OBP,
 819  * and it's kernel stack + %g6 thread register state is
 820  * not fully cooked yet.
 821  *
 822  * Therefore you cannot make any OBP calls, not even prom_printf,
 823  * from these two routines.
 824  */
 825 static void __cpuinit register_one_mondo(unsigned long paddr, unsigned long type, unsigned long qmask)
 826 {
 827         unsigned long num_entries = (qmask + 1) / 64;
 828         unsigned long status;
 829
 830         status = sun4v_cpu_qconf(type, paddr, num_entries);
 831         if (status != HV_EOK) {
 832                 prom_printf("SUN4V: sun4v_cpu_qconf(%lu:%lx:%lu) failed, "
 833                             "err %lu\n", type, paddr, num_entries, status);
 834                 prom_halt();
 835         }
 836 }
 837
 838 void __cpuinit sun4v_register_mondo_queues(int this_cpu)
 839 {
 840         struct trap_per_cpu *tb = &trap_block[this_cpu];
 841
 842         register_one_mondo(tb->cpu_mondo_pa, HV_CPU_QUEUE_CPU_MONDO,
 843                            tb->cpu_mondo_qmask);
 844         register_one_mondo(tb->dev_mondo_pa, HV_CPU_QUEUE_DEVICE_MONDO,
 845                            tb->dev_mondo_qmask);
 846         register_one_mondo(tb->resum_mondo_pa, HV_CPU_QUEUE_RES_ERROR,
 847                            tb->resum_qmask);
 848         register_one_mondo(tb->nonresum_mondo_pa, HV_CPU_QUEUE_NONRES_ERROR,
 849                            tb->nonresum_qmask);
 850 }
 851
 852 static void __init alloc_one_mondo(unsigned long *pa_ptr, unsigned long qmask)
 853 {
 854         unsigned long size = PAGE_ALIGN(qmask + 1);
 855         void *p = __alloc_bootmem_low(size, size, 0);
 856         if (!p) {
 857                 prom_printf("SUN4V: Error, cannot allocate mondo queue.\n");
 858                 prom_halt();
 859         }
 860
 861         *pa_ptr = __pa(p);
 862 }
 863
 864 static void __init alloc_one_kbuf(unsigned long *pa_ptr, unsigned long qmask)
 865 {
 866         unsigned long size = PAGE_ALIGN(qmask + 1);
 867         void *p = __alloc_bootmem_low(size, size, 0);
 868
 869         if (!p) {
 870                 prom_printf("SUN4V: Error, cannot allocate kbuf page.\n");
 871                 prom_halt();
 872         }
 873
 874         *pa_ptr = __pa(p);
 875 }
 876
 877 static void __init init_cpu_send_mondo_info(struct trap_per_cpu *tb)
 878 {
 879 #ifdef CONFIG_SMP
 880         void *page;
 881
 882         BUILD_BUG_ON((NR_CPUS * sizeof(u16)) > (PAGE_SIZE - 64));
 883
 884         page = alloc_bootmem_low_pages(PAGE_SIZE);
 885         if (!page) {
 886                 prom_printf("SUN4V: Error, cannot allocate cpu mondo page.\n");
 887                 prom_halt();
 888         }
 889
 890         tb->cpu_mondo_block_pa = __pa(page);
 891         tb->cpu_list_pa = __pa(page + 64);
 892 #endif
 893 }
 894
 895 /* Allocate mondo and error queues for all possible cpus.  */
 896 static void __init sun4v_init_mondo_queues(void)
 897 {
 898         int cpu;
 899
 900         for_each_possible_cpu(cpu) {
 901                 struct trap_per_cpu *tb = &trap_block[cpu];
 902
 903                 alloc_one_mondo(&tb->cpu_mondo_pa, tb->cpu_mondo_qmask);
 904                 alloc_one_mondo(&tb->dev_mondo_pa, tb->dev_mondo_qmask);
 905                 alloc_one_mondo(&tb->resum_mondo_pa, tb->resum_qmask);
 906                 alloc_one_kbuf(&tb->resum_kernel_buf_pa, tb->resum_qmask);
 907                 alloc_one_mondo(&tb->nonresum_mondo_pa, tb->nonresum_qmask);
 908                 alloc_one_kbuf(&tb->nonresum_kernel_buf_pa,
 909                                tb->nonresum_qmask);
 910
 911                 init_cpu_send_mondo_info(tb);
 912         }
 913
 914         /* Load up the boot cpu's entries.  */
 915         sun4v_register_mondo_queues(hard_smp_processor_id());
 916 }
 917
 918 static struct irqaction timer_irq_action = {
 919         .name = "timer",
 920 };
 921
 922 /* Only invoked on boot processor. */
 923 void __init init_IRQ(void)
 924 {
 925         map_prom_timers();
 926         kill_prom_timer();
 927         memset(&ivector_table[0], 0, sizeof(ivector_table));
 928
 929         if (tlb_type == hypervisor)
 930                 sun4v_init_mondo_queues();
 931
 932         /* We need to clear any IRQ's pending in the soft interrupt
 933          * registers, a spurious one could be left around from the
 934          * PROM timer which we just disabled.
 935          */
 936         clear_softint(get_softint());
 937
 938         /* Now that ivector table is initialized, it is safe
 939          * to receive IRQ vector traps.  We will normally take
 940          * one or two right now, in case some device PROM used
 941          * to boot us wants to speak to us.  We just ignore them.
 942          */
 943         __asm__ __volatile__("rdpr      %%pstate, %%g1\n\t"
 944                              "or        %%g1, %0, %%g1\n\t"
 945                              "wrpr      %%g1, 0x0, %%pstate"
 946                              : /* No outputs */
 947                              : "i" (PSTATE_IE)
 948                              : "g1");
 949
 950         irq_desc[0].action = &timer_irq_action;
 951 }