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  *
  55  * If you make changes to ino_bucket, please update hand coded assembler
  56  * of the vectored interrupt trap handler(s) in entry.S and sun4v_ivec.S
  57  */
  58 struct ino_bucket {
  59 /*0x00*/unsigned long irq_chain_pa;
  60
  61         /* Virtual interrupt number assigned to this INO.  */
  62 /*0x08*/unsigned int virt_irq;
  63 /*0x0c*/unsigned int __pad;
  64 };
  65
  66 #define NUM_IVECS       (IMAP_INR + 1)
  67 struct ino_bucket ivector_table[NUM_IVECS] __attribute__ ((aligned (SMP_CACHE_BYTES)));
  68 unsigned long ivector_table_pa;
  69
  70 #define __irq_ino(irq) \
  71         (((struct ino_bucket *)(irq)) - &ivector_table[0])
  72 #define __bucket(irq) ((struct ino_bucket *)(irq))
  73 #define __irq(bucket) ((unsigned long)(bucket))
  74
  75 #define irq_work_pa(__cpu)      &(trap_block[(__cpu)].irq_worklist_pa)
  76
  77 static struct {
  78         unsigned long irq;
  79         unsigned int dev_handle;
  80         unsigned int dev_ino;
  81 } virt_to_real_irq_table[NR_IRQS];
  82 static DEFINE_SPINLOCK(virt_irq_alloc_lock);
  83
  84 unsigned char virt_irq_alloc(unsigned long real_irq)
  85 {
  86         unsigned long flags;
  87         unsigned char ent;
  88
  89         BUILD_BUG_ON(NR_IRQS >= 256);
  90
  91         spin_lock_irqsave(&virt_irq_alloc_lock, flags);
  92
  93         for (ent = 1; ent < NR_IRQS; ent++) {
  94                 if (!virt_to_real_irq_table[ent].irq)
  95                         break;
  96         }
  97         if (ent >= NR_IRQS) {
  98                 printk(KERN_ERR "IRQ: Out of virtual IRQs.\n");
  99                 ent = 0;
 100         } else {
 101                 virt_to_real_irq_table[ent].irq = real_irq;
 102         }
 103
 104         spin_unlock_irqrestore(&virt_irq_alloc_lock, flags);
 105
 106         return ent;
 107 }
 108
 109 #ifdef CONFIG_PCI_MSI
 110 void virt_irq_free(unsigned int virt_irq)
 111 {
 112         unsigned long flags;
 113
 114         if (virt_irq >= NR_IRQS)
 115                 return;
 116
 117         spin_lock_irqsave(&virt_irq_alloc_lock, flags);
 118
 119         virt_to_real_irq_table[virt_irq].irq = 0;
 120
 121         spin_unlock_irqrestore(&virt_irq_alloc_lock, flags);
 122 }
 123 #endif
 124
 125 static unsigned long virt_to_real_irq(unsigned char virt_irq)
 126 {
 127         return virt_to_real_irq_table[virt_irq].irq;
 128 }
 129
 130 /*
 131  * /proc/interrupts printing:
 132  */
 133
 134 int show_interrupts(struct seq_file *p, void *v)
 135 {
 136         int i = *(loff_t *) v, j;
 137         struct irqaction * action;
 138         unsigned long flags;
 139
 140         if (i == 0) {
 141                 seq_printf(p, "           ");
 142                 for_each_online_cpu(j)
 143                         seq_printf(p, "CPU%d       ",j);
 144                 seq_putc(p, '\n');
 145         }
 146
 147         if (i < NR_IRQS) {
 148                 spin_lock_irqsave(&irq_desc[i].lock, flags);
 149                 action = irq_desc[i].action;
 150                 if (!action)
 151                         goto skip;
 152                 seq_printf(p, "%3d: ",i);
 153 #ifndef CONFIG_SMP
 154                 seq_printf(p, "%10u ", kstat_irqs(i));
 155 #else
 156                 for_each_online_cpu(j)
 157                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
 158 #endif
 159                 seq_printf(p, " %9s", irq_desc[i].chip->typename);
 160                 seq_printf(p, "  %s", action->name);
 161
 162                 for (action=action->next; action; action = action->next)
 163                         seq_printf(p, ", %s", action->name);
 164
 165                 seq_putc(p, '\n');
 166 skip:
 167                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 168         }
 169         return 0;
 170 }
 171
 172 static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid)
 173 {
 174         unsigned int tid;
 175
 176         if (this_is_starfire) {
 177                 tid = starfire_translate(imap, cpuid);
 178                 tid <<= IMAP_TID_SHIFT;
 179                 tid &= IMAP_TID_UPA;
 180         } else {
 181                 if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 182                         unsigned long ver;
 183
 184                         __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 185                         if ((ver >> 32UL) == __JALAPENO_ID ||
 186                             (ver >> 32UL) == __SERRANO_ID) {
 187                                 tid = cpuid << IMAP_TID_SHIFT;
 188                                 tid &= IMAP_TID_JBUS;
 189                         } else {
 190                                 unsigned int a = cpuid & 0x1f;
 191                                 unsigned int n = (cpuid >> 5) & 0x1f;
 192
 193                                 tid = ((a << IMAP_AID_SHIFT) |
 194                                        (n << IMAP_NID_SHIFT));
 195                                 tid &= (IMAP_AID_SAFARI |
 196                                         IMAP_NID_SAFARI);;
 197                         }
 198                 } else {
 199                         tid = cpuid << IMAP_TID_SHIFT;
 200                         tid &= IMAP_TID_UPA;
 201                 }
 202         }
 203
 204         return tid;
 205 }
 206
 207 struct irq_handler_data {
 208         unsigned long   iclr;
 209         unsigned long   imap;
 210
 211         void            (*pre_handler)(unsigned int, void *, void *);
 212         void            *pre_handler_arg1;
 213         void            *pre_handler_arg2;
 214 };
 215
 216 static inline struct ino_bucket *virt_irq_to_bucket(unsigned int virt_irq)
 217 {
 218         unsigned long real_irq = virt_to_real_irq(virt_irq);
 219         struct ino_bucket *bucket = NULL;
 220
 221         if (likely(real_irq))
 222                 bucket = __bucket(real_irq);
 223
 224         return bucket;
 225 }
 226
 227 #ifdef CONFIG_SMP
 228 static int irq_choose_cpu(unsigned int virt_irq)
 229 {
 230         cpumask_t mask = irq_desc[virt_irq].affinity;
 231         int cpuid;
 232
 233         if (cpus_equal(mask, CPU_MASK_ALL)) {
 234                 static int irq_rover;
 235                 static DEFINE_SPINLOCK(irq_rover_lock);
 236                 unsigned long flags;
 237
 238                 /* Round-robin distribution... */
 239         do_round_robin:
 240                 spin_lock_irqsave(&irq_rover_lock, flags);
 241
 242                 while (!cpu_online(irq_rover)) {
 243                         if (++irq_rover >= NR_CPUS)
 244                                 irq_rover = 0;
 245                 }
 246                 cpuid = irq_rover;
 247                 do {
 248                         if (++irq_rover >= NR_CPUS)
 249                                 irq_rover = 0;
 250                 } while (!cpu_online(irq_rover));
 251
 252                 spin_unlock_irqrestore(&irq_rover_lock, flags);
 253         } else {
 254                 cpumask_t tmp;
 255
 256                 cpus_and(tmp, cpu_online_map, mask);
 257
 258                 if (cpus_empty(tmp))
 259                         goto do_round_robin;
 260
 261                 cpuid = first_cpu(tmp);
 262         }
 263
 264         return cpuid;
 265 }
 266 #else
 267 static int irq_choose_cpu(unsigned int virt_irq)
 268 {
 269         return real_hard_smp_processor_id();
 270 }
 271 #endif
 272
 273 static void sun4u_irq_enable(unsigned int virt_irq)
 274 {
 275         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 276
 277         if (likely(data)) {
 278                 unsigned long cpuid, imap, val;
 279                 unsigned int tid;
 280
 281                 cpuid = irq_choose_cpu(virt_irq);
 282                 imap = data->imap;
 283
 284                 tid = sun4u_compute_tid(imap, cpuid);
 285
 286                 val = upa_readq(imap);
 287                 val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS |
 288                          IMAP_AID_SAFARI | IMAP_NID_SAFARI);
 289                 val |= tid | IMAP_VALID;
 290                 upa_writeq(val, imap);
 291         }
 292 }
 293
 294 static void sun4u_set_affinity(unsigned int virt_irq, cpumask_t mask)
 295 {
 296         sun4u_irq_enable(virt_irq);
 297 }
 298
 299 static void sun4u_irq_disable(unsigned int virt_irq)
 300 {
 301         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 302
 303         if (likely(data)) {
 304                 unsigned long imap = data->imap;
 305                 unsigned long tmp = upa_readq(imap);
 306
 307                 tmp &= ~IMAP_VALID;
 308                 upa_writeq(tmp, imap);
 309         }
 310 }
 311
 312 static void sun4u_irq_end(unsigned int virt_irq)
 313 {
 314         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 315         struct irq_desc *desc = irq_desc + virt_irq;
 316
 317         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 318                 return;
 319
 320         if (likely(data))
 321                 upa_writeq(ICLR_IDLE, data->iclr);
 322 }
 323
 324 static void sun4v_irq_enable(unsigned int virt_irq)
 325 {
 326         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 327         unsigned int ino = bucket - &ivector_table[0];
 328
 329         if (likely(bucket)) {
 330                 unsigned long cpuid;
 331                 int err;
 332
 333                 cpuid = irq_choose_cpu(virt_irq);
 334
 335                 err = sun4v_intr_settarget(ino, cpuid);
 336                 if (err != HV_EOK)
 337                         printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
 338                                "err(%d)\n", ino, cpuid, err);
 339                 err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 340                 if (err != HV_EOK)
 341                         printk(KERN_ERR "sun4v_intr_setstate(%x): "
 342                                "err(%d)\n", ino, err);
 343                 err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED);
 344                 if (err != HV_EOK)
 345                         printk(KERN_ERR "sun4v_intr_setenabled(%x): err(%d)\n",
 346                                ino, err);
 347         }
 348 }
 349
 350 static void sun4v_set_affinity(unsigned int virt_irq, cpumask_t mask)
 351 {
 352         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 353         unsigned int ino = bucket - &ivector_table[0];
 354
 355         if (likely(bucket)) {
 356                 unsigned long cpuid;
 357                 int err;
 358
 359                 cpuid = irq_choose_cpu(virt_irq);
 360
 361                 err = sun4v_intr_settarget(ino, cpuid);
 362                 if (err != HV_EOK)
 363                         printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
 364                                "err(%d)\n", ino, cpuid, err);
 365         }
 366 }
 367
 368 static void sun4v_irq_disable(unsigned int virt_irq)
 369 {
 370         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 371         unsigned int ino = bucket - &ivector_table[0];
 372
 373         if (likely(bucket)) {
 374                 int err;
 375
 376                 err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED);
 377                 if (err != HV_EOK)
 378                         printk(KERN_ERR "sun4v_intr_setenabled(%x): "
 379                                "err(%d)\n", ino, err);
 380         }
 381 }
 382
 383 static void sun4v_irq_end(unsigned int virt_irq)
 384 {
 385         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 386         unsigned int ino = bucket - &ivector_table[0];
 387         struct irq_desc *desc = irq_desc + virt_irq;
 388
 389         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 390                 return;
 391
 392         if (likely(bucket)) {
 393                 int err;
 394
 395                 err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 396                 if (err != HV_EOK)
 397                         printk(KERN_ERR "sun4v_intr_setstate(%x): "
 398                                "err(%d)\n", ino, err);
 399         }
 400 }
 401
 402 static void sun4v_virq_enable(unsigned int virt_irq)
 403 {
 404         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 405
 406         if (likely(bucket)) {
 407                 unsigned long cpuid, dev_handle, dev_ino;
 408                 int err;
 409
 410                 cpuid = irq_choose_cpu(virt_irq);
 411
 412                 dev_handle = virt_to_real_irq_table[virt_irq].dev_handle;
 413                 dev_ino = virt_to_real_irq_table[virt_irq].dev_ino;
 414
 415                 err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
 416                 if (err != HV_EOK)
 417                         printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
 418                                "err(%d)\n",
 419                                dev_handle, dev_ino, cpuid, err);
 420                 err = sun4v_vintr_set_state(dev_handle, dev_ino,
 421                                             HV_INTR_STATE_IDLE);
 422                 if (err != HV_EOK)
 423                         printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 424                                 "HV_INTR_STATE_IDLE): err(%d)\n",
 425                                dev_handle, dev_ino, err);
 426                 err = sun4v_vintr_set_valid(dev_handle, dev_ino,
 427                                             HV_INTR_ENABLED);
 428                 if (err != HV_EOK)
 429                         printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 430                                "HV_INTR_ENABLED): err(%d)\n",
 431                                dev_handle, dev_ino, err);
 432         }
 433 }
 434
 435 static void sun4v_virt_set_affinity(unsigned int virt_irq, cpumask_t mask)
 436 {
 437         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 438
 439         if (likely(bucket)) {
 440                 unsigned long cpuid, dev_handle, dev_ino;
 441                 int err;
 442
 443                 cpuid = irq_choose_cpu(virt_irq);
 444
 445                 dev_handle = virt_to_real_irq_table[virt_irq].dev_handle;
 446                 dev_ino = virt_to_real_irq_table[virt_irq].dev_ino;
 447
 448                 err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
 449                 if (err != HV_EOK)
 450                         printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
 451                                "err(%d)\n",
 452                                dev_handle, dev_ino, cpuid, err);
 453         }
 454 }
 455
 456 static void sun4v_virq_disable(unsigned int virt_irq)
 457 {
 458         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 459
 460         if (likely(bucket)) {
 461                 unsigned long dev_handle, dev_ino;
 462                 int err;
 463
 464                 dev_handle = virt_to_real_irq_table[virt_irq].dev_handle;
 465                 dev_ino = virt_to_real_irq_table[virt_irq].dev_ino;
 466
 467                 err = sun4v_vintr_set_valid(dev_handle, dev_ino,
 468                                             HV_INTR_DISABLED);
 469                 if (err != HV_EOK)
 470                         printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 471                                "HV_INTR_DISABLED): err(%d)\n",
 472                                dev_handle, dev_ino, err);
 473         }
 474 }
 475
 476 static void sun4v_virq_end(unsigned int virt_irq)
 477 {
 478         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 479         struct irq_desc *desc = irq_desc + virt_irq;
 480
 481         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 482                 return;
 483
 484         if (likely(bucket)) {
 485                 unsigned long dev_handle, dev_ino;
 486                 int err;
 487
 488                 dev_handle = virt_to_real_irq_table[virt_irq].dev_handle;
 489                 dev_ino = virt_to_real_irq_table[virt_irq].dev_ino;
 490
 491                 err = sun4v_vintr_set_state(dev_handle, dev_ino,
 492                                             HV_INTR_STATE_IDLE);
 493                 if (err != HV_EOK)
 494                         printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 495                                 "HV_INTR_STATE_IDLE): err(%d)\n",
 496                                dev_handle, dev_ino, err);
 497         }
 498 }
 499
 500 static void run_pre_handler(unsigned int virt_irq)
 501 {
 502         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 503         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 504
 505         if (likely(data->pre_handler)) {
 506                 data->pre_handler(__irq_ino(__irq(bucket)),
 507                                   data->pre_handler_arg1,
 508                                   data->pre_handler_arg2);
 509         }
 510 }
 511
 512 static struct irq_chip sun4u_irq = {
 513         .typename       = "sun4u",
 514         .enable         = sun4u_irq_enable,
 515         .disable        = sun4u_irq_disable,
 516         .end            = sun4u_irq_end,
 517         .set_affinity   = sun4u_set_affinity,
 518 };
 519
 520 static struct irq_chip sun4u_irq_ack = {
 521         .typename       = "sun4u+ack",
 522         .enable         = sun4u_irq_enable,
 523         .disable        = sun4u_irq_disable,
 524         .ack            = run_pre_handler,
 525         .end            = sun4u_irq_end,
 526         .set_affinity   = sun4u_set_affinity,
 527 };
 528
 529 static struct irq_chip sun4v_irq = {
 530         .typename       = "sun4v",
 531         .enable         = sun4v_irq_enable,
 532         .disable        = sun4v_irq_disable,
 533         .end            = sun4v_irq_end,
 534         .set_affinity   = sun4v_set_affinity,
 535 };
 536
 537 static struct irq_chip sun4v_virq = {
 538         .typename       = "vsun4v",
 539         .enable         = sun4v_virq_enable,
 540         .disable        = sun4v_virq_disable,
 541         .end            = sun4v_virq_end,
 542         .set_affinity   = sun4v_virt_set_affinity,
 543 };
 544
 545 void irq_install_pre_handler(int virt_irq,
 546                              void (*func)(unsigned int, void *, void *),
 547                              void *arg1, void *arg2)
 548 {
 549         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 550         struct irq_chip *chip = get_irq_chip(virt_irq);
 551
 552         if (WARN_ON(chip == &sun4v_irq || chip == &sun4v_virq)) {
 553                 printk(KERN_ERR "IRQ: Trying to install pre-handler on "
 554                        "sun4v irq %u\n", virt_irq);
 555                 return;
 556         }
 557
 558         data->pre_handler = func;
 559         data->pre_handler_arg1 = arg1;
 560         data->pre_handler_arg2 = arg2;
 561
 562         if (chip == &sun4u_irq_ack)
 563                 return;
 564
 565         set_irq_chip(virt_irq, &sun4u_irq_ack);
 566 }
 567
 568 unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
 569 {
 570         struct ino_bucket *bucket;
 571         struct irq_handler_data *data;
 572         int ino;
 573
 574         BUG_ON(tlb_type == hypervisor);
 575
 576         ino = (upa_readq(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
 577         bucket = &ivector_table[ino];
 578         if (!bucket->virt_irq) {
 579                 bucket->virt_irq = virt_irq_alloc(__irq(bucket));
 580                 set_irq_chip(bucket->virt_irq, &sun4u_irq);
 581         }
 582
 583         data = get_irq_chip_data(bucket->virt_irq);
 584         if (unlikely(data))
 585                 goto out;
 586
 587         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 588         if (unlikely(!data)) {
 589                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 590                 prom_halt();
 591         }
 592         set_irq_chip_data(bucket->virt_irq, data);
 593
 594         data->imap  = imap;
 595         data->iclr  = iclr;
 596
 597 out:
 598         return bucket->virt_irq;
 599 }
 600
 601 static unsigned int sun4v_build_common(unsigned long sysino,
 602                                        struct irq_chip *chip)
 603 {
 604         struct ino_bucket *bucket;
 605         struct irq_handler_data *data;
 606
 607         BUG_ON(tlb_type != hypervisor);
 608
 609         bucket = &ivector_table[sysino];
 610         if (!bucket->virt_irq) {
 611                 bucket->virt_irq = virt_irq_alloc(__irq(bucket));
 612                 set_irq_chip(bucket->virt_irq, chip);
 613         }
 614
 615         data = get_irq_chip_data(bucket->virt_irq);
 616         if (unlikely(data))
 617                 goto out;
 618
 619         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 620         if (unlikely(!data)) {
 621                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 622                 prom_halt();
 623         }
 624         set_irq_chip_data(bucket->virt_irq, data);
 625
 626         /* Catch accidental accesses to these things.  IMAP/ICLR handling
 627          * is done by hypervisor calls on sun4v platforms, not by direct
 628          * register accesses.
 629          */
 630         data->imap = ~0UL;
 631         data->iclr = ~0UL;
 632
 633 out:
 634         return bucket->virt_irq;
 635 }
 636
 637 unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino)
 638 {
 639         unsigned long sysino = sun4v_devino_to_sysino(devhandle, devino);
 640
 641         return sun4v_build_common(sysino, &sun4v_irq);
 642 }
 643
 644 unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino)
 645 {
 646         unsigned long sysino, hv_err;
 647         unsigned int virq;
 648
 649         BUG_ON(devhandle & devino);
 650
 651         sysino = devhandle | devino;
 652         BUG_ON(sysino & ~(IMAP_IGN | IMAP_INO));
 653
 654         hv_err = sun4v_vintr_set_cookie(devhandle, devino, sysino);
 655         if (hv_err) {
 656                 prom_printf("IRQ: Fatal, cannot set cookie for [%x:%x] "
 657                             "err=%lu\n", devhandle, devino, hv_err);
 658                 prom_halt();
 659         }
 660
 661         virq = sun4v_build_common(sysino, &sun4v_virq);
 662
 663         virt_to_real_irq_table[virq].dev_handle = devhandle;
 664         virt_to_real_irq_table[virq].dev_ino = devino;
 665
 666         return virq;
 667 }
 668
 669 void ack_bad_irq(unsigned int virt_irq)
 670 {
 671         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 672         unsigned int ino = 0xdeadbeef;
 673
 674         if (bucket)
 675                 ino = bucket - &ivector_table[0];
 676
 677         printk(KERN_CRIT "Unexpected IRQ from ino[%x] virt_irq[%u]\n",
 678                ino, virt_irq);
 679 }
 680
 681 void handler_irq(int irq, struct pt_regs *regs)
 682 {
 683         unsigned long pstate, bucket_pa;
 684         struct pt_regs *old_regs;
 685
 686         clear_softint(1 << irq);
 687
 688         old_regs = set_irq_regs(regs);
 689         irq_enter();
 690
 691         /* Grab an atomic snapshot of the pending IVECs.  */
 692         __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
 693                              "wrpr      %0, %3, %%pstate\n\t"
 694                              "ldx       [%2], %1\n\t"
 695                              "stx       %%g0, [%2]\n\t"
 696                              "wrpr      %0, 0x0, %%pstate\n\t"
 697                              : "=&r" (pstate), "=&r" (bucket_pa)
 698                              : "r" (irq_work_pa(smp_processor_id())),
 699                                "i" (PSTATE_IE)
 700                              : "memory");
 701
 702         while (bucket_pa) {
 703                 unsigned long next_pa;
 704                 unsigned int virt_irq;
 705
 706                 __asm__ __volatile__("ldxa      [%2] %4, %0\n\t"
 707                                      "lduwa     [%3] %4, %1\n\t"
 708                                      "stxa      %%g0, [%2] %4"
 709                                      : "=&r" (next_pa), "=&r" (virt_irq)
 710                                      : "r" (bucket_pa +
 711                                             offsetof(struct ino_bucket,
 712                                                      irq_chain_pa)),
 713                                        "r" (bucket_pa +
 714                                             offsetof(struct ino_bucket,
 715                                                      virt_irq)),
 716                                        "i" (ASI_PHYS_USE_EC));
 717
 718                 __do_IRQ(virt_irq);
 719
 720                 bucket_pa = next_pa;
 721         }
 722
 723         irq_exit();
 724         set_irq_regs(old_regs);
 725 }
 726
 727 #ifdef CONFIG_HOTPLUG_CPU
 728 void fixup_irqs(void)
 729 {
 730         unsigned int irq;
 731
 732         for (irq = 0; irq < NR_IRQS; irq++) {
 733                 unsigned long flags;
 734
 735                 spin_lock_irqsave(&irq_desc[irq].lock, flags);
 736                 if (irq_desc[irq].action &&
 737                     !(irq_desc[irq].status & IRQ_PER_CPU)) {
 738                         if (irq_desc[irq].chip->set_affinity)
 739                                 irq_desc[irq].chip->set_affinity(irq,
 740                                         irq_desc[irq].affinity);
 741                 }
 742                 spin_unlock_irqrestore(&irq_desc[irq].lock, flags);
 743         }
 744 }
 745 #endif
 746
 747 struct sun5_timer {
 748         u64     count0;
 749         u64     limit0;
 750         u64     count1;
 751         u64     limit1;
 752 };
 753
 754 static struct sun5_timer *prom_timers;
 755 static u64 prom_limit0, prom_limit1;
 756
 757 static void map_prom_timers(void)
 758 {
 759         struct device_node *dp;
 760         const unsigned int *addr;
 761
 762         /* PROM timer node hangs out in the top level of device siblings... */
 763         dp = of_find_node_by_path("/");
 764         dp = dp->child;
 765         while (dp) {
 766                 if (!strcmp(dp->name, "counter-timer"))
 767                         break;
 768                 dp = dp->sibling;
 769         }
 770
 771         /* Assume if node is not present, PROM uses different tick mechanism
 772          * which we should not care about.
 773          */
 774         if (!dp) {
 775                 prom_timers = (struct sun5_timer *) 0;
 776                 return;
 777         }
 778
 779         /* If PROM is really using this, it must be mapped by him. */
 780         addr = of_get_property(dp, "address", NULL);
 781         if (!addr) {
 782                 prom_printf("PROM does not have timer mapped, trying to continue.\n");
 783                 prom_timers = (struct sun5_timer *) 0;
 784                 return;
 785         }
 786         prom_timers = (struct sun5_timer *) ((unsigned long)addr[0]);
 787 }
 788
 789 static void kill_prom_timer(void)
 790 {
 791         if (!prom_timers)
 792                 return;
 793
 794         /* Save them away for later. */
 795         prom_limit0 = prom_timers->limit0;
 796         prom_limit1 = prom_timers->limit1;
 797
 798         /* Just as in sun4c/sun4m PROM uses timer which ticks at IRQ 14.
 799          * We turn both off here just to be paranoid.
 800          */
 801         prom_timers->limit0 = 0;
 802         prom_timers->limit1 = 0;
 803
 804         /* Wheee, eat the interrupt packet too... */
 805         __asm__ __volatile__(
 806 "       mov     0x40, %%g2\n"
 807 "       ldxa    [%%g0] %0, %%g1\n"
 808 "       ldxa    [%%g2] %1, %%g1\n"
 809 "       stxa    %%g0, [%%g0] %0\n"
 810 "       membar  #Sync\n"
 811         : /* no outputs */
 812         : "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R)
 813         : "g1", "g2");
 814 }
 815
 816 void init_irqwork_curcpu(void)
 817 {
 818         int cpu = hard_smp_processor_id();
 819
 820         trap_block[cpu].irq_worklist_pa = 0UL;
 821 }
 822
 823 /* Please be very careful with register_one_mondo() and
 824  * sun4v_register_mondo_queues().
 825  *
 826  * On SMP this gets invoked from the CPU trampoline before
 827  * the cpu has fully taken over the trap table from OBP,
 828  * and it's kernel stack + %g6 thread register state is
 829  * not fully cooked yet.
 830  *
 831  * Therefore you cannot make any OBP calls, not even prom_printf,
 832  * from these two routines.
 833  */
 834 static void __cpuinit register_one_mondo(unsigned long paddr, unsigned long type, unsigned long qmask)
 835 {
 836         unsigned long num_entries = (qmask + 1) / 64;
 837         unsigned long status;
 838
 839         status = sun4v_cpu_qconf(type, paddr, num_entries);
 840         if (status != HV_EOK) {
 841                 prom_printf("SUN4V: sun4v_cpu_qconf(%lu:%lx:%lu) failed, "
 842                             "err %lu\n", type, paddr, num_entries, status);
 843                 prom_halt();
 844         }
 845 }
 846
 847 void __cpuinit sun4v_register_mondo_queues(int this_cpu)
 848 {
 849         struct trap_per_cpu *tb = &trap_block[this_cpu];
 850
 851         register_one_mondo(tb->cpu_mondo_pa, HV_CPU_QUEUE_CPU_MONDO,
 852                            tb->cpu_mondo_qmask);
 853         register_one_mondo(tb->dev_mondo_pa, HV_CPU_QUEUE_DEVICE_MONDO,
 854                            tb->dev_mondo_qmask);
 855         register_one_mondo(tb->resum_mondo_pa, HV_CPU_QUEUE_RES_ERROR,
 856                            tb->resum_qmask);
 857         register_one_mondo(tb->nonresum_mondo_pa, HV_CPU_QUEUE_NONRES_ERROR,
 858                            tb->nonresum_qmask);
 859 }
 860
 861 static void __init alloc_one_mondo(unsigned long *pa_ptr, unsigned long qmask)
 862 {
 863         unsigned long size = PAGE_ALIGN(qmask + 1);
 864         void *p = __alloc_bootmem_low(size, size, 0);
 865         if (!p) {
 866                 prom_printf("SUN4V: Error, cannot allocate mondo queue.\n");
 867                 prom_halt();
 868         }
 869
 870         *pa_ptr = __pa(p);
 871 }
 872
 873 static void __init alloc_one_kbuf(unsigned long *pa_ptr, unsigned long qmask)
 874 {
 875         unsigned long size = PAGE_ALIGN(qmask + 1);
 876         void *p = __alloc_bootmem_low(size, size, 0);
 877
 878         if (!p) {
 879                 prom_printf("SUN4V: Error, cannot allocate kbuf page.\n");
 880                 prom_halt();
 881         }
 882
 883         *pa_ptr = __pa(p);
 884 }
 885
 886 static void __init init_cpu_send_mondo_info(struct trap_per_cpu *tb)
 887 {
 888 #ifdef CONFIG_SMP
 889         void *page;
 890
 891         BUILD_BUG_ON((NR_CPUS * sizeof(u16)) > (PAGE_SIZE - 64));
 892
 893         page = alloc_bootmem_low_pages(PAGE_SIZE);
 894         if (!page) {
 895                 prom_printf("SUN4V: Error, cannot allocate cpu mondo page.\n");
 896                 prom_halt();
 897         }
 898
 899         tb->cpu_mondo_block_pa = __pa(page);
 900         tb->cpu_list_pa = __pa(page + 64);
 901 #endif
 902 }
 903
 904 /* Allocate mondo and error queues for all possible cpus.  */
 905 static void __init sun4v_init_mondo_queues(void)
 906 {
 907         int cpu;
 908
 909         for_each_possible_cpu(cpu) {
 910                 struct trap_per_cpu *tb = &trap_block[cpu];
 911
 912                 alloc_one_mondo(&tb->cpu_mondo_pa, tb->cpu_mondo_qmask);
 913                 alloc_one_mondo(&tb->dev_mondo_pa, tb->dev_mondo_qmask);
 914                 alloc_one_mondo(&tb->resum_mondo_pa, tb->resum_qmask);
 915                 alloc_one_kbuf(&tb->resum_kernel_buf_pa, tb->resum_qmask);
 916                 alloc_one_mondo(&tb->nonresum_mondo_pa, tb->nonresum_qmask);
 917                 alloc_one_kbuf(&tb->nonresum_kernel_buf_pa,
 918                                tb->nonresum_qmask);
 919
 920                 init_cpu_send_mondo_info(tb);
 921         }
 922
 923         /* Load up the boot cpu's entries.  */
 924         sun4v_register_mondo_queues(hard_smp_processor_id());
 925 }
 926
 927 static struct irqaction timer_irq_action = {
 928         .name = "timer",
 929 };
 930
 931 /* XXX Belongs in a common location. XXX */
 932 static unsigned long kimage_addr_to_ra(void *p)
 933 {
 934         unsigned long val = (unsigned long) p;
 935
 936         return kern_base + (val - KERNBASE);
 937 }
 938
 939 /* Only invoked on boot processor. */
 940 void __init init_IRQ(void)
 941 {
 942         map_prom_timers();
 943         kill_prom_timer();
 944         memset(&ivector_table[0], 0, sizeof(ivector_table));
 945
 946         ivector_table_pa = kimage_addr_to_ra(&ivector_table[0]);
 947
 948         if (tlb_type == hypervisor)
 949                 sun4v_init_mondo_queues();
 950
 951         /* We need to clear any IRQ's pending in the soft interrupt
 952          * registers, a spurious one could be left around from the
 953          * PROM timer which we just disabled.
 954          */
 955         clear_softint(get_softint());
 956
 957         /* Now that ivector table is initialized, it is safe
 958          * to receive IRQ vector traps.  We will normally take
 959          * one or two right now, in case some device PROM used
 960          * to boot us wants to speak to us.  We just ignore them.
 961          */
 962         __asm__ __volatile__("rdpr      %%pstate, %%g1\n\t"
 963                              "or        %%g1, %0, %%g1\n\t"
 964                              "wrpr      %%g1, 0x0, %%pstate"
 965                              : /* No outputs */
 966                              : "i" (PSTATE_IE)
 967                              : "g1");
 968
 969         irq_desc[0].action = &timer_irq_action;
 970 }