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 #include <linux/msi.h>
  25
  26 #include <asm/ptrace.h>
  27 #include <asm/processor.h>
  28 #include <asm/atomic.h>
  29 #include <asm/system.h>
  30 #include <asm/irq.h>
  31 #include <asm/io.h>
  32 #include <asm/sbus.h>
  33 #include <asm/iommu.h>
  34 #include <asm/upa.h>
  35 #include <asm/oplib.h>
  36 #include <asm/prom.h>
  37 #include <asm/timer.h>
  38 #include <asm/smp.h>
  39 #include <asm/starfire.h>
  40 #include <asm/uaccess.h>
  41 #include <asm/cache.h>
  42 #include <asm/cpudata.h>
  43 #include <asm/auxio.h>
  44 #include <asm/head.h>
  45 #include <asm/hypervisor.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  * The IVEC handler does not need to act atomically, the PIL dispatch
  56  * code uses CAS to get an atomic snapshot of the list and clear it
  57  * at the same time.
  58  *
  59  * If you make changes to ino_bucket, please update hand coded assembler
  60  * of the vectored interrupt trap handler(s) in entry.S and sun4v_ivec.S
  61  */
  62 struct ino_bucket {
  63         /* Next handler in per-CPU IRQ worklist.  We know that
  64          * bucket pointers have the high 32-bits clear, so to
  65          * save space we only store the bits we need.
  66          */
  67 /*0x00*/unsigned int irq_chain;
  68
  69         /* Virtual interrupt number assigned to this INO.  */
  70 /*0x04*/unsigned int virt_irq;
  71 };
  72
  73 #define NUM_IVECS       (IMAP_INR + 1)
  74 struct ino_bucket ivector_table[NUM_IVECS] __attribute__ ((aligned (SMP_CACHE_BYTES)));
  75
  76 #define __irq_ino(irq) \
  77         (((struct ino_bucket *)(unsigned long)(irq)) - &ivector_table[0])
  78 #define __bucket(irq) ((struct ino_bucket *)(unsigned long)(irq))
  79 #define __irq(bucket) ((unsigned int)(unsigned long)(bucket))
  80
  81 /* This has to be in the main kernel image, it cannot be
  82  * turned into per-cpu data.  The reason is that the main
  83  * kernel image is locked into the TLB and this structure
  84  * is accessed from the vectored interrupt trap handler.  If
  85  * access to this structure takes a TLB miss it could cause
  86  * the 5-level sparc v9 trap stack to overflow.
  87  */
  88 #define irq_work(__cpu) &(trap_block[(__cpu)].irq_worklist)
  89
  90 static unsigned int virt_to_real_irq_table[NR_IRQS];
  91
  92 static unsigned char virt_irq_alloc(unsigned int real_irq)
  93 {
  94         unsigned char ent;
  95
  96         BUILD_BUG_ON(NR_IRQS >= 256);
  97
  98         for (ent = 1; ent < NR_IRQS; ent++) {
  99                 if (!virt_to_real_irq_table[ent])
 100                         break;
 101         }
 102         if (ent >= NR_IRQS) {
 103                 printk(KERN_ERR "IRQ: Out of virtual IRQs.\n");
 104                 return 0;
 105         }
 106
 107         virt_to_real_irq_table[ent] = real_irq;
 108
 109         return ent;
 110 }
 111
 112 #ifdef CONFIG_PCI_MSI
 113 static void virt_irq_free(unsigned int virt_irq)
 114 {
 115         unsigned int real_irq;
 116
 117         if (virt_irq >= NR_IRQS)
 118                 return;
 119
 120         real_irq = virt_to_real_irq_table[virt_irq];
 121         virt_to_real_irq_table[virt_irq] = 0;
 122
 123         __bucket(real_irq)->virt_irq = 0;
 124 }
 125 #endif
 126
 127 static unsigned int virt_to_real_irq(unsigned char virt_irq)
 128 {
 129         return virt_to_real_irq_table[virt_irq];
 130 }
 131
 132 /*
 133  * /proc/interrupts printing:
 134  */
 135
 136 int show_interrupts(struct seq_file *p, void *v)
 137 {
 138         int i = *(loff_t *) v, j;
 139         struct irqaction * action;
 140         unsigned long flags;
 141
 142         if (i == 0) {
 143                 seq_printf(p, "           ");
 144                 for_each_online_cpu(j)
 145                         seq_printf(p, "CPU%d       ",j);
 146                 seq_putc(p, '\n');
 147         }
 148
 149         if (i < NR_IRQS) {
 150                 spin_lock_irqsave(&irq_desc[i].lock, flags);
 151                 action = irq_desc[i].action;
 152                 if (!action)
 153                         goto skip;
 154                 seq_printf(p, "%3d: ",i);
 155 #ifndef CONFIG_SMP
 156                 seq_printf(p, "%10u ", kstat_irqs(i));
 157 #else
 158                 for_each_online_cpu(j)
 159                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
 160 #endif
 161                 seq_printf(p, " %9s", irq_desc[i].chip->typename);
 162                 seq_printf(p, "  %s", action->name);
 163
 164                 for (action=action->next; action; action = action->next)
 165                         seq_printf(p, ", %s", action->name);
 166
 167                 seq_putc(p, '\n');
 168 skip:
 169                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 170         }
 171         return 0;
 172 }
 173
 174 static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid)
 175 {
 176         unsigned int tid;
 177
 178         if (this_is_starfire) {
 179                 tid = starfire_translate(imap, cpuid);
 180                 tid <<= IMAP_TID_SHIFT;
 181                 tid &= IMAP_TID_UPA;
 182         } else {
 183                 if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 184                         unsigned long ver;
 185
 186                         __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 187                         if ((ver >> 32UL) == __JALAPENO_ID ||
 188                             (ver >> 32UL) == __SERRANO_ID) {
 189                                 tid = cpuid << IMAP_TID_SHIFT;
 190                                 tid &= IMAP_TID_JBUS;
 191                         } else {
 192                                 unsigned int a = cpuid & 0x1f;
 193                                 unsigned int n = (cpuid >> 5) & 0x1f;
 194
 195                                 tid = ((a << IMAP_AID_SHIFT) |
 196                                        (n << IMAP_NID_SHIFT));
 197                                 tid &= (IMAP_AID_SAFARI |
 198                                         IMAP_NID_SAFARI);;
 199                         }
 200                 } else {
 201                         tid = cpuid << IMAP_TID_SHIFT;
 202                         tid &= IMAP_TID_UPA;
 203                 }
 204         }
 205
 206         return tid;
 207 }
 208
 209 struct irq_handler_data {
 210         unsigned long   iclr;
 211         unsigned long   imap;
 212
 213         void            (*pre_handler)(unsigned int, void *, void *);
 214         void            *pre_handler_arg1;
 215         void            *pre_handler_arg2;
 216 };
 217
 218 static inline struct ino_bucket *virt_irq_to_bucket(unsigned int virt_irq)
 219 {
 220         unsigned int real_irq = virt_to_real_irq(virt_irq);
 221         struct ino_bucket *bucket = NULL;
 222
 223         if (likely(real_irq))
 224                 bucket = __bucket(real_irq);
 225
 226         return bucket;
 227 }
 228
 229 #ifdef CONFIG_SMP
 230 static int irq_choose_cpu(unsigned int virt_irq)
 231 {
 232         cpumask_t mask = irq_desc[virt_irq].affinity;
 233         int cpuid;
 234
 235         if (cpus_equal(mask, CPU_MASK_ALL)) {
 236                 static int irq_rover;
 237                 static DEFINE_SPINLOCK(irq_rover_lock);
 238                 unsigned long flags;
 239
 240                 /* Round-robin distribution... */
 241         do_round_robin:
 242                 spin_lock_irqsave(&irq_rover_lock, flags);
 243
 244                 while (!cpu_online(irq_rover)) {
 245                         if (++irq_rover >= NR_CPUS)
 246                                 irq_rover = 0;
 247                 }
 248                 cpuid = irq_rover;
 249                 do {
 250                         if (++irq_rover >= NR_CPUS)
 251                                 irq_rover = 0;
 252                 } while (!cpu_online(irq_rover));
 253
 254                 spin_unlock_irqrestore(&irq_rover_lock, flags);
 255         } else {
 256                 cpumask_t tmp;
 257
 258                 cpus_and(tmp, cpu_online_map, mask);
 259
 260                 if (cpus_empty(tmp))
 261                         goto do_round_robin;
 262
 263                 cpuid = first_cpu(tmp);
 264         }
 265
 266         return cpuid;
 267 }
 268 #else
 269 static int irq_choose_cpu(unsigned int virt_irq)
 270 {
 271         return real_hard_smp_processor_id();
 272 }
 273 #endif
 274
 275 static void sun4u_irq_enable(unsigned int virt_irq)
 276 {
 277         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 278
 279         if (likely(data)) {
 280                 unsigned long cpuid, imap, val;
 281                 unsigned int tid;
 282
 283                 cpuid = irq_choose_cpu(virt_irq);
 284                 imap = data->imap;
 285
 286                 tid = sun4u_compute_tid(imap, cpuid);
 287
 288                 val = upa_readq(imap);
 289                 val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS |
 290                          IMAP_AID_SAFARI | IMAP_NID_SAFARI);
 291                 val |= tid | IMAP_VALID;
 292                 upa_writeq(val, imap);
 293         }
 294 }
 295
 296 static void sun4u_set_affinity(unsigned int virt_irq, cpumask_t mask)
 297 {
 298         sun4u_irq_enable(virt_irq);
 299 }
 300
 301 static void sun4u_irq_disable(unsigned int virt_irq)
 302 {
 303         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 304
 305         if (likely(data)) {
 306                 unsigned long imap = data->imap;
 307                 u32 tmp = upa_readq(imap);
 308
 309                 tmp &= ~IMAP_VALID;
 310                 upa_writeq(tmp, imap);
 311         }
 312 }
 313
 314 static void sun4u_irq_end(unsigned int virt_irq)
 315 {
 316         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 317         struct irq_desc *desc = irq_desc + virt_irq;
 318
 319         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 320                 return;
 321
 322         if (likely(data))
 323                 upa_writeq(ICLR_IDLE, data->iclr);
 324 }
 325
 326 static void sun4v_irq_enable(unsigned int virt_irq)
 327 {
 328         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 329         unsigned int ino = bucket - &ivector_table[0];
 330
 331         if (likely(bucket)) {
 332                 unsigned long cpuid;
 333                 int err;
 334
 335                 cpuid = irq_choose_cpu(virt_irq);
 336
 337                 err = sun4v_intr_settarget(ino, cpuid);
 338                 if (err != HV_EOK)
 339                         printk("sun4v_intr_settarget(%x,%lu): err(%d)\n",
 340                                ino, cpuid, err);
 341                 err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 342                 if (err != HV_EOK)
 343                         printk("sun4v_intr_setstate(%x): "
 344                                "err(%d)\n", ino, err);
 345                 err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED);
 346                 if (err != HV_EOK)
 347                         printk("sun4v_intr_setenabled(%x): err(%d)\n",
 348                                ino, err);
 349         }
 350 }
 351
 352 static void sun4v_set_affinity(unsigned int virt_irq, cpumask_t mask)
 353 {
 354         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 355         unsigned int ino = bucket - &ivector_table[0];
 356
 357         if (likely(bucket)) {
 358                 unsigned long cpuid;
 359                 int err;
 360
 361                 cpuid = irq_choose_cpu(virt_irq);
 362
 363                 err = sun4v_intr_settarget(ino, cpuid);
 364                 if (err != HV_EOK)
 365                         printk("sun4v_intr_settarget(%x,%lu): err(%d)\n",
 366                                ino, cpuid, err);
 367         }
 368 }
 369
 370 static void sun4v_irq_disable(unsigned int virt_irq)
 371 {
 372         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 373         unsigned int ino = bucket - &ivector_table[0];
 374
 375         if (likely(bucket)) {
 376                 int err;
 377
 378                 err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED);
 379                 if (err != HV_EOK)
 380                         printk("sun4v_intr_setenabled(%x): "
 381                                "err(%d)\n", ino, err);
 382         }
 383 }
 384
 385 #ifdef CONFIG_PCI_MSI
 386 static void sun4v_msi_enable(unsigned int virt_irq)
 387 {
 388         sun4v_irq_enable(virt_irq);
 389         unmask_msi_irq(virt_irq);
 390 }
 391
 392 static void sun4v_msi_disable(unsigned int virt_irq)
 393 {
 394         mask_msi_irq(virt_irq);
 395         sun4v_irq_disable(virt_irq);
 396 }
 397 #endif
 398
 399 static void sun4v_irq_end(unsigned int virt_irq)
 400 {
 401         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 402         unsigned int ino = bucket - &ivector_table[0];
 403         struct irq_desc *desc = irq_desc + virt_irq;
 404
 405         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 406                 return;
 407
 408         if (likely(bucket)) {
 409                 int err;
 410
 411                 err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 412                 if (err != HV_EOK)
 413                         printk("sun4v_intr_setstate(%x): "
 414                                "err(%d)\n", ino, err);
 415         }
 416 }
 417
 418 static void sun4v_virq_enable(unsigned int virt_irq)
 419 {
 420         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 421         unsigned int ino = bucket - &ivector_table[0];
 422
 423         if (likely(bucket)) {
 424                 unsigned long cpuid, dev_handle, dev_ino;
 425                 int err;
 426
 427                 cpuid = irq_choose_cpu(virt_irq);
 428
 429                 dev_handle = ino & IMAP_IGN;
 430                 dev_ino = ino & IMAP_INO;
 431
 432                 err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
 433                 if (err != HV_EOK)
 434                         printk("sun4v_vintr_set_target(%lx,%lx,%lu): "
 435                                "err(%d)\n",
 436                                dev_handle, dev_ino, cpuid, err);
 437                 err = sun4v_vintr_set_state(dev_handle, dev_ino,
 438                                             HV_INTR_STATE_IDLE);
 439                 if (err != HV_EOK)
 440                         printk("sun4v_vintr_set_state(%lx,%lx,"
 441                                 "HV_INTR_STATE_IDLE): err(%d)\n",
 442                                dev_handle, dev_ino, err);
 443                 err = sun4v_vintr_set_valid(dev_handle, dev_ino,
 444                                             HV_INTR_ENABLED);
 445                 if (err != HV_EOK)
 446                         printk("sun4v_vintr_set_state(%lx,%lx,"
 447                                "HV_INTR_ENABLED): err(%d)\n",
 448                                dev_handle, dev_ino, err);
 449         }
 450 }
 451
 452 static void sun4v_virt_set_affinity(unsigned int virt_irq, cpumask_t mask)
 453 {
 454         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 455         unsigned int ino = bucket - &ivector_table[0];
 456
 457         if (likely(bucket)) {
 458                 unsigned long cpuid, dev_handle, dev_ino;
 459                 int err;
 460
 461                 cpuid = irq_choose_cpu(virt_irq);
 462
 463                 dev_handle = ino & IMAP_IGN;
 464                 dev_ino = ino & IMAP_INO;
 465
 466                 err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
 467                 if (err != HV_EOK)
 468                         printk("sun4v_vintr_set_target(%lx,%lx,%lu): "
 469                                "err(%d)\n",
 470                                dev_handle, dev_ino, cpuid, err);
 471         }
 472 }
 473
 474 static void sun4v_virq_disable(unsigned int virt_irq)
 475 {
 476         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 477         unsigned int ino = bucket - &ivector_table[0];
 478
 479         if (likely(bucket)) {
 480                 unsigned long dev_handle, dev_ino;
 481                 int err;
 482
 483                 dev_handle = ino & IMAP_IGN;
 484                 dev_ino = ino & IMAP_INO;
 485
 486                 err = sun4v_vintr_set_valid(dev_handle, dev_ino,
 487                                             HV_INTR_DISABLED);
 488                 if (err != HV_EOK)
 489                         printk("sun4v_vintr_set_state(%lx,%lx,"
 490                                "HV_INTR_DISABLED): err(%d)\n",
 491                                dev_handle, dev_ino, err);
 492         }
 493 }
 494
 495 static void sun4v_virq_end(unsigned int virt_irq)
 496 {
 497         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 498         unsigned int ino = bucket - &ivector_table[0];
 499         struct irq_desc *desc = irq_desc + virt_irq;
 500
 501         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 502                 return;
 503
 504         if (likely(bucket)) {
 505                 unsigned long dev_handle, dev_ino;
 506                 int err;
 507
 508                 dev_handle = ino & IMAP_IGN;
 509                 dev_ino = ino & IMAP_INO;
 510
 511                 err = sun4v_vintr_set_state(dev_handle, dev_ino,
 512                                             HV_INTR_STATE_IDLE);
 513                 if (err != HV_EOK)
 514                         printk("sun4v_vintr_set_state(%lx,%lx,"
 515                                 "HV_INTR_STATE_IDLE): err(%d)\n",
 516                                dev_handle, dev_ino, err);
 517         }
 518 }
 519
 520 static void run_pre_handler(unsigned int virt_irq)
 521 {
 522         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 523         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 524
 525         if (likely(data->pre_handler)) {
 526                 data->pre_handler(__irq_ino(__irq(bucket)),
 527                                   data->pre_handler_arg1,
 528                                   data->pre_handler_arg2);
 529         }
 530 }
 531
 532 static struct irq_chip sun4u_irq = {
 533         .typename       = "sun4u",
 534         .enable         = sun4u_irq_enable,
 535         .disable        = sun4u_irq_disable,
 536         .end            = sun4u_irq_end,
 537         .set_affinity   = sun4u_set_affinity,
 538 };
 539
 540 static struct irq_chip sun4u_irq_ack = {
 541         .typename       = "sun4u+ack",
 542         .enable         = sun4u_irq_enable,
 543         .disable        = sun4u_irq_disable,
 544         .ack            = run_pre_handler,
 545         .end            = sun4u_irq_end,
 546         .set_affinity   = sun4u_set_affinity,
 547 };
 548
 549 static struct irq_chip sun4v_irq = {
 550         .typename       = "sun4v",
 551         .enable         = sun4v_irq_enable,
 552         .disable        = sun4v_irq_disable,
 553         .end            = sun4v_irq_end,
 554         .set_affinity   = sun4v_set_affinity,
 555 };
 556
 557 static struct irq_chip sun4v_irq_ack = {
 558         .typename       = "sun4v+ack",
 559         .enable         = sun4v_irq_enable,
 560         .disable        = sun4v_irq_disable,
 561         .ack            = run_pre_handler,
 562         .end            = sun4v_irq_end,
 563         .set_affinity   = sun4v_set_affinity,
 564 };
 565
 566 #ifdef CONFIG_PCI_MSI
 567 static struct irq_chip sun4v_msi = {
 568         .typename       = "sun4v+msi",
 569         .mask           = mask_msi_irq,
 570         .unmask         = unmask_msi_irq,
 571         .enable         = sun4v_msi_enable,
 572         .disable        = sun4v_msi_disable,
 573         .ack            = run_pre_handler,
 574         .end            = sun4v_irq_end,
 575         .set_affinity   = sun4v_set_affinity,
 576 };
 577 #endif
 578
 579 static struct irq_chip sun4v_virq = {
 580         .typename       = "vsun4v",
 581         .enable         = sun4v_virq_enable,
 582         .disable        = sun4v_virq_disable,
 583         .end            = sun4v_virq_end,
 584         .set_affinity   = sun4v_virt_set_affinity,
 585 };
 586
 587 static struct irq_chip sun4v_virq_ack = {
 588         .typename       = "vsun4v+ack",
 589         .enable         = sun4v_virq_enable,
 590         .disable        = sun4v_virq_disable,
 591         .ack            = run_pre_handler,
 592         .end            = sun4v_virq_end,
 593         .set_affinity   = sun4v_virt_set_affinity,
 594 };
 595
 596 void irq_install_pre_handler(int virt_irq,
 597                              void (*func)(unsigned int, void *, void *),
 598                              void *arg1, void *arg2)
 599 {
 600         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 601         struct irq_chip *chip;
 602
 603         data->pre_handler = func;
 604         data->pre_handler_arg1 = arg1;
 605         data->pre_handler_arg2 = arg2;
 606
 607         chip = get_irq_chip(virt_irq);
 608         if (chip == &sun4u_irq_ack ||
 609             chip == &sun4v_irq_ack ||
 610             chip == &sun4v_virq_ack
 611 #ifdef CONFIG_PCI_MSI
 612             || chip == &sun4v_msi
 613 #endif
 614             )
 615                 return;
 616
 617         chip = (chip == &sun4u_irq ?
 618                 &sun4u_irq_ack :
 619                 (chip == &sun4v_irq ?
 620                  &sun4v_irq_ack : &sun4v_virq_ack));
 621         set_irq_chip(virt_irq, chip);
 622 }
 623
 624 unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
 625 {
 626         struct ino_bucket *bucket;
 627         struct irq_handler_data *data;
 628         int ino;
 629
 630         BUG_ON(tlb_type == hypervisor);
 631
 632         ino = (upa_readq(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
 633         bucket = &ivector_table[ino];
 634         if (!bucket->virt_irq) {
 635                 bucket->virt_irq = virt_irq_alloc(__irq(bucket));
 636                 set_irq_chip(bucket->virt_irq, &sun4u_irq);
 637         }
 638
 639         data = get_irq_chip_data(bucket->virt_irq);
 640         if (unlikely(data))
 641                 goto out;
 642
 643         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 644         if (unlikely(!data)) {
 645                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 646                 prom_halt();
 647         }
 648         set_irq_chip_data(bucket->virt_irq, data);
 649
 650         data->imap  = imap;
 651         data->iclr  = iclr;
 652
 653 out:
 654         return bucket->virt_irq;
 655 }
 656
 657 static unsigned int sun4v_build_common(unsigned long sysino,
 658                                        struct irq_chip *chip)
 659 {
 660         struct ino_bucket *bucket;
 661         struct irq_handler_data *data;
 662
 663         BUG_ON(tlb_type != hypervisor);
 664
 665         bucket = &ivector_table[sysino];
 666         if (!bucket->virt_irq) {
 667                 bucket->virt_irq = virt_irq_alloc(__irq(bucket));
 668                 set_irq_chip(bucket->virt_irq, chip);
 669         }
 670
 671         data = get_irq_chip_data(bucket->virt_irq);
 672         if (unlikely(data))
 673                 goto out;
 674
 675         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 676         if (unlikely(!data)) {
 677                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 678                 prom_halt();
 679         }
 680         set_irq_chip_data(bucket->virt_irq, data);
 681
 682         /* Catch accidental accesses to these things.  IMAP/ICLR handling
 683          * is done by hypervisor calls on sun4v platforms, not by direct
 684          * register accesses.
 685          */
 686         data->imap = ~0UL;
 687         data->iclr = ~0UL;
 688
 689 out:
 690         return bucket->virt_irq;
 691 }
 692
 693 unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino)
 694 {
 695         unsigned long sysino = sun4v_devino_to_sysino(devhandle, devino);
 696
 697         return sun4v_build_common(sysino, &sun4v_irq);
 698 }
 699
 700 unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino)
 701 {
 702         unsigned long sysino, hv_err;
 703
 704         BUG_ON(devhandle & devino);
 705
 706         sysino = devhandle | devino;
 707         BUG_ON(sysino & ~(IMAP_IGN | IMAP_INO));
 708
 709         hv_err = sun4v_vintr_set_cookie(devhandle, devino, sysino);
 710         if (hv_err) {
 711                 prom_printf("IRQ: Fatal, cannot set cookie for [%x:%x] "
 712                             "err=%lu\n", devhandle, devino, hv_err);
 713                 prom_halt();
 714         }
 715
 716         return sun4v_build_common(sysino, &sun4v_virq);
 717 }
 718
 719 #ifdef CONFIG_PCI_MSI
 720 unsigned int sun4v_build_msi(u32 devhandle, unsigned int *virt_irq_p,
 721                              unsigned int msi_start, unsigned int msi_end)
 722 {
 723         struct ino_bucket *bucket;
 724         struct irq_handler_data *data;
 725         unsigned long sysino;
 726         unsigned int devino;
 727
 728         BUG_ON(tlb_type != hypervisor);
 729
 730         /* Find a free devino in the given range.  */
 731         for (devino = msi_start; devino < msi_end; devino++) {
 732                 sysino = sun4v_devino_to_sysino(devhandle, devino);
 733                 bucket = &ivector_table[sysino];
 734                 if (!bucket->virt_irq)
 735                         break;
 736         }
 737         if (devino >= msi_end)
 738                 return 0;
 739
 740         sysino = sun4v_devino_to_sysino(devhandle, devino);
 741         bucket = &ivector_table[sysino];
 742         bucket->virt_irq = virt_irq_alloc(__irq(bucket));
 743         *virt_irq_p = bucket->virt_irq;
 744         set_irq_chip(bucket->virt_irq, &sun4v_msi);
 745
 746         data = get_irq_chip_data(bucket->virt_irq);
 747         if (unlikely(data))
 748                 return devino;
 749
 750         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 751         if (unlikely(!data)) {
 752                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 753                 prom_halt();
 754         }
 755         set_irq_chip_data(bucket->virt_irq, data);
 756
 757         data->imap = ~0UL;
 758         data->iclr = ~0UL;
 759
 760         return devino;
 761 }
 762
 763 void sun4v_destroy_msi(unsigned int virt_irq)
 764 {
 765         virt_irq_free(virt_irq);
 766 }
 767 #endif
 768
 769 void ack_bad_irq(unsigned int virt_irq)
 770 {
 771         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 772         unsigned int ino = 0xdeadbeef;
 773
 774         if (bucket)
 775                 ino = bucket - &ivector_table[0];
 776
 777         printk(KERN_CRIT "Unexpected IRQ from ino[%x] virt_irq[%u]\n",
 778                ino, virt_irq);
 779 }
 780
 781 void handler_irq(int irq, struct pt_regs *regs)
 782 {
 783         struct ino_bucket *bucket;
 784         struct pt_regs *old_regs;
 785
 786         clear_softint(1 << irq);
 787
 788         old_regs = set_irq_regs(regs);
 789         irq_enter();
 790
 791         /* Sliiiick... */
 792         bucket = __bucket(xchg32(irq_work(smp_processor_id()), 0));
 793         while (bucket) {
 794                 struct ino_bucket *next = __bucket(bucket->irq_chain);
 795
 796                 bucket->irq_chain = 0;
 797                 __do_IRQ(bucket->virt_irq);
 798
 799                 bucket = next;
 800         }
 801
 802         irq_exit();
 803         set_irq_regs(old_regs);
 804 }
 805
 806 #ifdef CONFIG_HOTPLUG_CPU
 807 void fixup_irqs(void)
 808 {
 809         unsigned int irq;
 810
 811         for (irq = 0; irq < NR_IRQS; irq++) {
 812                 unsigned long flags;
 813
 814                 spin_lock_irqsave(&irq_desc[irq].lock, flags);
 815                 if (irq_desc[irq].action &&
 816                     !(irq_desc[irq].status & IRQ_PER_CPU)) {
 817                         if (irq_desc[irq].chip->set_affinity)
 818                                 irq_desc[irq].chip->set_affinity(irq,
 819                                         irq_desc[irq].affinity);
 820                 }
 821                 spin_unlock_irqrestore(&irq_desc[irq].lock, flags);
 822         }
 823 }
 824 #endif
 825
 826 struct sun5_timer {
 827         u64     count0;
 828         u64     limit0;
 829         u64     count1;
 830         u64     limit1;
 831 };
 832
 833 static struct sun5_timer *prom_timers;
 834 static u64 prom_limit0, prom_limit1;
 835
 836 static void map_prom_timers(void)
 837 {
 838         struct device_node *dp;
 839         const unsigned int *addr;
 840
 841         /* PROM timer node hangs out in the top level of device siblings... */
 842         dp = of_find_node_by_path("/");
 843         dp = dp->child;
 844         while (dp) {
 845                 if (!strcmp(dp->name, "counter-timer"))
 846                         break;
 847                 dp = dp->sibling;
 848         }
 849
 850         /* Assume if node is not present, PROM uses different tick mechanism
 851          * which we should not care about.
 852          */
 853         if (!dp) {
 854                 prom_timers = (struct sun5_timer *) 0;
 855                 return;
 856         }
 857
 858         /* If PROM is really using this, it must be mapped by him. */
 859         addr = of_get_property(dp, "address", NULL);
 860         if (!addr) {
 861                 prom_printf("PROM does not have timer mapped, trying to continue.\n");
 862                 prom_timers = (struct sun5_timer *) 0;
 863                 return;
 864         }
 865         prom_timers = (struct sun5_timer *) ((unsigned long)addr[0]);
 866 }
 867
 868 static void kill_prom_timer(void)
 869 {
 870         if (!prom_timers)
 871                 return;
 872
 873         /* Save them away for later. */
 874         prom_limit0 = prom_timers->limit0;
 875         prom_limit1 = prom_timers->limit1;
 876
 877         /* Just as in sun4c/sun4m PROM uses timer which ticks at IRQ 14.
 878          * We turn both off here just to be paranoid.
 879          */
 880         prom_timers->limit0 = 0;
 881         prom_timers->limit1 = 0;
 882
 883         /* Wheee, eat the interrupt packet too... */
 884         __asm__ __volatile__(
 885 "       mov     0x40, %%g2\n"
 886 "       ldxa    [%%g0] %0, %%g1\n"
 887 "       ldxa    [%%g2] %1, %%g1\n"
 888 "       stxa    %%g0, [%%g0] %0\n"
 889 "       membar  #Sync\n"
 890         : /* no outputs */
 891         : "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R)
 892         : "g1", "g2");
 893 }
 894
 895 void init_irqwork_curcpu(void)
 896 {
 897         int cpu = hard_smp_processor_id();
 898
 899         trap_block[cpu].irq_worklist = 0;
 900 }
 901
 902 /* Please be very careful with register_one_mondo() and
 903  * sun4v_register_mondo_queues().
 904  *
 905  * On SMP this gets invoked from the CPU trampoline before
 906  * the cpu has fully taken over the trap table from OBP,
 907  * and it's kernel stack + %g6 thread register state is
 908  * not fully cooked yet.
 909  *
 910  * Therefore you cannot make any OBP calls, not even prom_printf,
 911  * from these two routines.
 912  */
 913 static void __cpuinit register_one_mondo(unsigned long paddr, unsigned long type, unsigned long qmask)
 914 {
 915         unsigned long num_entries = (qmask + 1) / 64;
 916         unsigned long status;
 917
 918         status = sun4v_cpu_qconf(type, paddr, num_entries);
 919         if (status != HV_EOK) {
 920                 prom_printf("SUN4V: sun4v_cpu_qconf(%lu:%lx:%lu) failed, "
 921                             "err %lu\n", type, paddr, num_entries, status);
 922                 prom_halt();
 923         }
 924 }
 925
 926 static void __cpuinit sun4v_register_mondo_queues(int this_cpu)
 927 {
 928         struct trap_per_cpu *tb = &trap_block[this_cpu];
 929
 930         register_one_mondo(tb->cpu_mondo_pa, HV_CPU_QUEUE_CPU_MONDO,
 931                            tb->cpu_mondo_qmask);
 932         register_one_mondo(tb->dev_mondo_pa, HV_CPU_QUEUE_DEVICE_MONDO,
 933                            tb->dev_mondo_qmask);
 934         register_one_mondo(tb->resum_mondo_pa, HV_CPU_QUEUE_RES_ERROR,
 935                            tb->resum_qmask);
 936         register_one_mondo(tb->nonresum_mondo_pa, HV_CPU_QUEUE_NONRES_ERROR,
 937                            tb->nonresum_qmask);
 938 }
 939
 940 static void __cpuinit alloc_one_mondo(unsigned long *pa_ptr, unsigned long qmask, int use_bootmem)
 941 {
 942         unsigned long size = PAGE_ALIGN(qmask + 1);
 943         unsigned long order = get_order(size);
 944         void *p = NULL;
 945
 946         if (use_bootmem) {
 947                 p = __alloc_bootmem_low(size, size, 0);
 948         } else {
 949                 struct page *page = alloc_pages(GFP_ATOMIC | __GFP_ZERO, order);
 950                 if (page)
 951                         p = page_address(page);
 952         }
 953
 954         if (!p) {
 955                 prom_printf("SUN4V: Error, cannot allocate mondo queue.\n");
 956                 prom_halt();
 957         }
 958
 959         *pa_ptr = __pa(p);
 960 }
 961
 962 static void __cpuinit alloc_one_kbuf(unsigned long *pa_ptr, unsigned long qmask, int use_bootmem)
 963 {
 964         unsigned long size = PAGE_ALIGN(qmask + 1);
 965         unsigned long order = get_order(size);
 966         void *p = NULL;
 967
 968         if (use_bootmem) {
 969                 p = __alloc_bootmem_low(size, size, 0);
 970         } else {
 971                 struct page *page = alloc_pages(GFP_ATOMIC | __GFP_ZERO, order);
 972                 if (page)
 973                         p = page_address(page);
 974         }
 975
 976         if (!p) {
 977                 prom_printf("SUN4V: Error, cannot allocate kbuf page.\n");
 978                 prom_halt();
 979         }
 980
 981         *pa_ptr = __pa(p);
 982 }
 983
 984 static void __cpuinit init_cpu_send_mondo_info(struct trap_per_cpu *tb, int use_bootmem)
 985 {
 986 #ifdef CONFIG_SMP
 987         void *page;
 988
 989         BUILD_BUG_ON((NR_CPUS * sizeof(u16)) > (PAGE_SIZE - 64));
 990
 991         if (use_bootmem)
 992                 page = alloc_bootmem_low_pages(PAGE_SIZE);
 993         else
 994                 page = (void *) get_zeroed_page(GFP_ATOMIC);
 995
 996         if (!page) {
 997                 prom_printf("SUN4V: Error, cannot allocate cpu mondo page.\n");
 998                 prom_halt();
 999         }
1000
1001         tb->cpu_mondo_block_pa = __pa(page);
1002         tb->cpu_list_pa = __pa(page + 64);
1003 #endif
1004 }
1005
1006 /* Allocate and register the mondo and error queues for this cpu.  */
1007 void __cpuinit sun4v_init_mondo_queues(int use_bootmem, int cpu, int alloc, int load)
1008 {
1009         struct trap_per_cpu *tb = &trap_block[cpu];
1010
1011         if (alloc) {
1012                 alloc_one_mondo(&tb->cpu_mondo_pa, tb->cpu_mondo_qmask, use_bootmem);
1013                 alloc_one_mondo(&tb->dev_mondo_pa, tb->dev_mondo_qmask, use_bootmem);
1014                 alloc_one_mondo(&tb->resum_mondo_pa, tb->resum_qmask, use_bootmem);
1015                 alloc_one_kbuf(&tb->resum_kernel_buf_pa, tb->resum_qmask, use_bootmem);
1016                 alloc_one_mondo(&tb->nonresum_mondo_pa, tb->nonresum_qmask, use_bootmem);
1017                 alloc_one_kbuf(&tb->nonresum_kernel_buf_pa, tb->nonresum_qmask, use_bootmem);
1018
1019                 init_cpu_send_mondo_info(tb, use_bootmem);
1020         }
1021
1022         if (load) {
1023                 if (cpu != hard_smp_processor_id()) {
1024                         prom_printf("SUN4V: init mondo on cpu %d not %d\n",
1025                                     cpu, hard_smp_processor_id());
1026                         prom_halt();
1027                 }
1028                 sun4v_register_mondo_queues(cpu);
1029         }
1030 }
1031
1032 static struct irqaction timer_irq_action = {
1033         .name = "timer",
1034 };
1035
1036 /* Only invoked on boot processor. */
1037 void __init init_IRQ(void)
1038 {
1039         map_prom_timers();
1040         kill_prom_timer();
1041         memset(&ivector_table[0], 0, sizeof(ivector_table));
1042
1043         if (tlb_type == hypervisor)
1044                 sun4v_init_mondo_queues(1, hard_smp_processor_id(), 1, 1);
1045
1046         /* We need to clear any IRQ's pending in the soft interrupt
1047          * registers, a spurious one could be left around from the
1048          * PROM timer which we just disabled.
1049          */
1050         clear_softint(get_softint());
1051
1052         /* Now that ivector table is initialized, it is safe
1053          * to receive IRQ vector traps.  We will normally take
1054          * one or two right now, in case some device PROM used
1055          * to boot us wants to speak to us.  We just ignore them.
1056          */
1057         __asm__ __volatile__("rdpr      %%pstate, %%g1\n\t"
1058                              "or        %%g1, %0, %%g1\n\t"
1059                              "wrpr      %%g1, 0x0, %%pstate"
1060                              : /* No outputs */
1061                              : "i" (PSTATE_IE)
1062                              : "g1");
1063
1064         irq_desc[0].action = &timer_irq_action;
1065 }