arch/sparc64/kernel/irq.c

   1 /* irq.c: UltraSparc IRQ handling/init/registry.
   2  *
   3  * Copyright (C) 1997, 2007, 2008 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/iommu.h>
  32 #include <asm/upa.h>
  33 #include <asm/oplib.h>
  34 #include <asm/prom.h>
  35 #include <asm/timer.h>
  36 #include <asm/smp.h>
  37 #include <asm/starfire.h>
  38 #include <asm/uaccess.h>
  39 #include <asm/cache.h>
  40 #include <asm/cpudata.h>
  41 #include <asm/auxio.h>
  42 #include <asm/head.h>
  43 #include <asm/hypervisor.h>
  44 #include <asm/cacheflush.h>
  45
  46 #include "entry.h"
  47
  48 #define NUM_IVECS       (IMAP_INR + 1)
  49
  50 struct ino_bucket *ivector_table;
  51 unsigned long ivector_table_pa;
  52
  53 /* On several sun4u processors, it is illegal to mix bypass and
  54  * non-bypass accesses.  Therefore we access all INO buckets
  55  * using bypass accesses only.
  56  */
  57 static unsigned long bucket_get_chain_pa(unsigned long bucket_pa)
  58 {
  59         unsigned long ret;
  60
  61         __asm__ __volatile__("ldxa      [%1] %2, %0"
  62                              : "=&r" (ret)
  63                              : "r" (bucket_pa +
  64                                     offsetof(struct ino_bucket,
  65                                              __irq_chain_pa)),
  66                                "i" (ASI_PHYS_USE_EC));
  67
  68         return ret;
  69 }
  70
  71 static void bucket_clear_chain_pa(unsigned long bucket_pa)
  72 {
  73         __asm__ __volatile__("stxa      %%g0, [%0] %1"
  74                              : /* no outputs */
  75                              : "r" (bucket_pa +
  76                                     offsetof(struct ino_bucket,
  77                                              __irq_chain_pa)),
  78                                "i" (ASI_PHYS_USE_EC));
  79 }
  80
  81 static unsigned int bucket_get_virt_irq(unsigned long bucket_pa)
  82 {
  83         unsigned int ret;
  84
  85         __asm__ __volatile__("lduwa     [%1] %2, %0"
  86                              : "=&r" (ret)
  87                              : "r" (bucket_pa +
  88                                     offsetof(struct ino_bucket,
  89                                              __virt_irq)),
  90                                "i" (ASI_PHYS_USE_EC));
  91
  92         return ret;
  93 }
  94
  95 static void bucket_set_virt_irq(unsigned long bucket_pa,
  96                                 unsigned int virt_irq)
  97 {
  98         __asm__ __volatile__("stwa      %0, [%1] %2"
  99                              : /* no outputs */
 100                              : "r" (virt_irq),
 101                                "r" (bucket_pa +
 102                                     offsetof(struct ino_bucket,
 103                                              __virt_irq)),
 104                                "i" (ASI_PHYS_USE_EC));
 105 }
 106
 107 #define irq_work_pa(__cpu)      &(trap_block[(__cpu)].irq_worklist_pa)
 108
 109 static struct {
 110         unsigned int dev_handle;
 111         unsigned int dev_ino;
 112         unsigned int in_use;
 113 } virt_irq_table[NR_IRQS];
 114 static DEFINE_SPINLOCK(virt_irq_alloc_lock);
 115
 116 unsigned char virt_irq_alloc(unsigned int dev_handle,
 117                              unsigned int dev_ino)
 118 {
 119         unsigned long flags;
 120         unsigned char ent;
 121
 122         BUILD_BUG_ON(NR_IRQS >= 256);
 123
 124         spin_lock_irqsave(&virt_irq_alloc_lock, flags);
 125
 126         for (ent = 1; ent < NR_IRQS; ent++) {
 127                 if (!virt_irq_table[ent].in_use)
 128                         break;
 129         }
 130         if (ent >= NR_IRQS) {
 131                 printk(KERN_ERR "IRQ: Out of virtual IRQs.\n");
 132                 ent = 0;
 133         } else {
 134                 virt_irq_table[ent].dev_handle = dev_handle;
 135                 virt_irq_table[ent].dev_ino = dev_ino;
 136                 virt_irq_table[ent].in_use = 1;
 137         }
 138
 139         spin_unlock_irqrestore(&virt_irq_alloc_lock, flags);
 140
 141         return ent;
 142 }
 143
 144 #ifdef CONFIG_PCI_MSI
 145 void virt_irq_free(unsigned int virt_irq)
 146 {
 147         unsigned long flags;
 148
 149         if (virt_irq >= NR_IRQS)
 150                 return;
 151
 152         spin_lock_irqsave(&virt_irq_alloc_lock, flags);
 153
 154         virt_irq_table[virt_irq].in_use = 0;
 155
 156         spin_unlock_irqrestore(&virt_irq_alloc_lock, flags);
 157 }
 158 #endif
 159
 160 /*
 161  * /proc/interrupts printing:
 162  */
 163
 164 int show_interrupts(struct seq_file *p, void *v)
 165 {
 166         int i = *(loff_t *) v, j;
 167         struct irqaction * action;
 168         unsigned long flags;
 169
 170         if (i == 0) {
 171                 seq_printf(p, "           ");
 172                 for_each_online_cpu(j)
 173                         seq_printf(p, "CPU%d       ",j);
 174                 seq_putc(p, '\n');
 175         }
 176
 177         if (i < NR_IRQS) {
 178                 spin_lock_irqsave(&irq_desc[i].lock, flags);
 179                 action = irq_desc[i].action;
 180                 if (!action)
 181                         goto skip;
 182                 seq_printf(p, "%3d: ",i);
 183 #ifndef CONFIG_SMP
 184                 seq_printf(p, "%10u ", kstat_irqs(i));
 185 #else
 186                 for_each_online_cpu(j)
 187                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
 188 #endif
 189                 seq_printf(p, " %9s", irq_desc[i].chip->typename);
 190                 seq_printf(p, "  %s", action->name);
 191
 192                 for (action=action->next; action; action = action->next)
 193                         seq_printf(p, ", %s", action->name);
 194
 195                 seq_putc(p, '\n');
 196 skip:
 197                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 198         }
 199         return 0;
 200 }
 201
 202 static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid)
 203 {
 204         unsigned int tid;
 205
 206         if (this_is_starfire) {
 207                 tid = starfire_translate(imap, cpuid);
 208                 tid <<= IMAP_TID_SHIFT;
 209                 tid &= IMAP_TID_UPA;
 210         } else {
 211                 if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 212                         unsigned long ver;
 213
 214                         __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 215                         if ((ver >> 32UL) == __JALAPENO_ID ||
 216                             (ver >> 32UL) == __SERRANO_ID) {
 217                                 tid = cpuid << IMAP_TID_SHIFT;
 218                                 tid &= IMAP_TID_JBUS;
 219                         } else {
 220                                 unsigned int a = cpuid & 0x1f;
 221                                 unsigned int n = (cpuid >> 5) & 0x1f;
 222
 223                                 tid = ((a << IMAP_AID_SHIFT) |
 224                                        (n << IMAP_NID_SHIFT));
 225                                 tid &= (IMAP_AID_SAFARI |
 226                                         IMAP_NID_SAFARI);;
 227                         }
 228                 } else {
 229                         tid = cpuid << IMAP_TID_SHIFT;
 230                         tid &= IMAP_TID_UPA;
 231                 }
 232         }
 233
 234         return tid;
 235 }
 236
 237 struct irq_handler_data {
 238         unsigned long   iclr;
 239         unsigned long   imap;
 240
 241         void            (*pre_handler)(unsigned int, void *, void *);
 242         void            *arg1;
 243         void            *arg2;
 244 };
 245
 246 #ifdef CONFIG_SMP
 247 static int irq_choose_cpu(unsigned int virt_irq)
 248 {
 249         cpumask_t mask = irq_desc[virt_irq].affinity;
 250         int cpuid;
 251
 252         if (cpus_equal(mask, CPU_MASK_ALL)) {
 253                 static int irq_rover;
 254                 static DEFINE_SPINLOCK(irq_rover_lock);
 255                 unsigned long flags;
 256
 257                 /* Round-robin distribution... */
 258         do_round_robin:
 259                 spin_lock_irqsave(&irq_rover_lock, flags);
 260
 261                 while (!cpu_online(irq_rover)) {
 262                         if (++irq_rover >= NR_CPUS)
 263                                 irq_rover = 0;
 264                 }
 265                 cpuid = irq_rover;
 266                 do {
 267                         if (++irq_rover >= NR_CPUS)
 268                                 irq_rover = 0;
 269                 } while (!cpu_online(irq_rover));
 270
 271                 spin_unlock_irqrestore(&irq_rover_lock, flags);
 272         } else {
 273                 cpumask_t tmp;
 274
 275                 cpus_and(tmp, cpu_online_map, mask);
 276
 277                 if (cpus_empty(tmp))
 278                         goto do_round_robin;
 279
 280                 cpuid = first_cpu(tmp);
 281         }
 282
 283         return cpuid;
 284 }
 285 #else
 286 static int irq_choose_cpu(unsigned int virt_irq)
 287 {
 288         return real_hard_smp_processor_id();
 289 }
 290 #endif
 291
 292 static void sun4u_irq_enable(unsigned int virt_irq)
 293 {
 294         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 295
 296         if (likely(data)) {
 297                 unsigned long cpuid, imap, val;
 298                 unsigned int tid;
 299
 300                 cpuid = irq_choose_cpu(virt_irq);
 301                 imap = data->imap;
 302
 303                 tid = sun4u_compute_tid(imap, cpuid);
 304
 305                 val = upa_readq(imap);
 306                 val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS |
 307                          IMAP_AID_SAFARI | IMAP_NID_SAFARI);
 308                 val |= tid | IMAP_VALID;
 309                 upa_writeq(val, imap);
 310                 upa_writeq(ICLR_IDLE, data->iclr);
 311         }
 312 }
 313
 314 static void sun4u_set_affinity(unsigned int virt_irq, cpumask_t mask)
 315 {
 316         sun4u_irq_enable(virt_irq);
 317 }
 318
 319 static void sun4u_irq_disable(unsigned int virt_irq)
 320 {
 321         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 322
 323         if (likely(data)) {
 324                 unsigned long imap = data->imap;
 325                 unsigned long tmp = upa_readq(imap);
 326
 327                 tmp &= ~IMAP_VALID;
 328                 upa_writeq(tmp, imap);
 329         }
 330 }
 331
 332 static void sun4u_irq_eoi(unsigned int virt_irq)
 333 {
 334         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 335         struct irq_desc *desc = irq_desc + virt_irq;
 336
 337         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 338                 return;
 339
 340         if (likely(data))
 341                 upa_writeq(ICLR_IDLE, data->iclr);
 342 }
 343
 344 static void sun4v_irq_enable(unsigned int virt_irq)
 345 {
 346         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 347         unsigned long cpuid = irq_choose_cpu(virt_irq);
 348         int err;
 349
 350         err = sun4v_intr_settarget(ino, cpuid);
 351         if (err != HV_EOK)
 352                 printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
 353                        "err(%d)\n", ino, cpuid, err);
 354         err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 355         if (err != HV_EOK)
 356                 printk(KERN_ERR "sun4v_intr_setstate(%x): "
 357                        "err(%d)\n", ino, err);
 358         err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED);
 359         if (err != HV_EOK)
 360                 printk(KERN_ERR "sun4v_intr_setenabled(%x): err(%d)\n",
 361                        ino, err);
 362 }
 363
 364 static void sun4v_set_affinity(unsigned int virt_irq, cpumask_t mask)
 365 {
 366         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 367         unsigned long cpuid = irq_choose_cpu(virt_irq);
 368         int err;
 369
 370         err = sun4v_intr_settarget(ino, cpuid);
 371         if (err != HV_EOK)
 372                 printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
 373                        "err(%d)\n", ino, cpuid, err);
 374 }
 375
 376 static void sun4v_irq_disable(unsigned int virt_irq)
 377 {
 378         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 379         int err;
 380
 381         err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED);
 382         if (err != HV_EOK)
 383                 printk(KERN_ERR "sun4v_intr_setenabled(%x): "
 384                        "err(%d)\n", ino, err);
 385 }
 386
 387 static void sun4v_irq_eoi(unsigned int virt_irq)
 388 {
 389         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 390         struct irq_desc *desc = irq_desc + virt_irq;
 391         int err;
 392
 393         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 394                 return;
 395
 396         err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 397         if (err != HV_EOK)
 398                 printk(KERN_ERR "sun4v_intr_setstate(%x): "
 399                        "err(%d)\n", ino, err);
 400 }
 401
 402 static void sun4v_virq_enable(unsigned int virt_irq)
 403 {
 404         unsigned long cpuid, dev_handle, dev_ino;
 405         int err;
 406
 407         cpuid = irq_choose_cpu(virt_irq);
 408
 409         dev_handle = virt_irq_table[virt_irq].dev_handle;
 410         dev_ino = virt_irq_table[virt_irq].dev_ino;
 411
 412         err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
 413         if (err != HV_EOK)
 414                 printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
 415                        "err(%d)\n",
 416                        dev_handle, dev_ino, cpuid, err);
 417         err = sun4v_vintr_set_state(dev_handle, dev_ino,
 418                                     HV_INTR_STATE_IDLE);
 419         if (err != HV_EOK)
 420                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 421                        "HV_INTR_STATE_IDLE): err(%d)\n",
 422                        dev_handle, dev_ino, err);
 423         err = sun4v_vintr_set_valid(dev_handle, dev_ino,
 424                                     HV_INTR_ENABLED);
 425         if (err != HV_EOK)
 426                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 427                        "HV_INTR_ENABLED): err(%d)\n",
 428                        dev_handle, dev_ino, err);
 429 }
 430
 431 static void sun4v_virt_set_affinity(unsigned int virt_irq, cpumask_t mask)
 432 {
 433         unsigned long cpuid, dev_handle, dev_ino;
 434         int err;
 435
 436         cpuid = irq_choose_cpu(virt_irq);
 437
 438         dev_handle = virt_irq_table[virt_irq].dev_handle;
 439         dev_ino = virt_irq_table[virt_irq].dev_ino;
 440
 441         err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
 442         if (err != HV_EOK)
 443                 printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
 444                        "err(%d)\n",
 445                        dev_handle, dev_ino, cpuid, err);
 446 }
 447
 448 static void sun4v_virq_disable(unsigned int virt_irq)
 449 {
 450         unsigned long dev_handle, dev_ino;
 451         int err;
 452
 453         dev_handle = virt_irq_table[virt_irq].dev_handle;
 454         dev_ino = virt_irq_table[virt_irq].dev_ino;
 455
 456         err = sun4v_vintr_set_valid(dev_handle, dev_ino,
 457                                     HV_INTR_DISABLED);
 458         if (err != HV_EOK)
 459                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 460                        "HV_INTR_DISABLED): err(%d)\n",
 461                        dev_handle, dev_ino, err);
 462 }
 463
 464 static void sun4v_virq_eoi(unsigned int virt_irq)
 465 {
 466         struct irq_desc *desc = irq_desc + virt_irq;
 467         unsigned long dev_handle, dev_ino;
 468         int err;
 469
 470         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 471                 return;
 472
 473         dev_handle = virt_irq_table[virt_irq].dev_handle;
 474         dev_ino = virt_irq_table[virt_irq].dev_ino;
 475
 476         err = sun4v_vintr_set_state(dev_handle, dev_ino,
 477                                     HV_INTR_STATE_IDLE);
 478         if (err != HV_EOK)
 479                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 480                        "HV_INTR_STATE_IDLE): err(%d)\n",
 481                        dev_handle, dev_ino, err);
 482 }
 483
 484 static struct irq_chip sun4u_irq = {
 485         .typename       = "sun4u",
 486         .enable         = sun4u_irq_enable,
 487         .disable        = sun4u_irq_disable,
 488         .eoi            = sun4u_irq_eoi,
 489         .set_affinity   = sun4u_set_affinity,
 490 };
 491
 492 static struct irq_chip sun4v_irq = {
 493         .typename       = "sun4v",
 494         .enable         = sun4v_irq_enable,
 495         .disable        = sun4v_irq_disable,
 496         .eoi            = sun4v_irq_eoi,
 497         .set_affinity   = sun4v_set_affinity,
 498 };
 499
 500 static struct irq_chip sun4v_virq = {
 501         .typename       = "vsun4v",
 502         .enable         = sun4v_virq_enable,
 503         .disable        = sun4v_virq_disable,
 504         .eoi            = sun4v_virq_eoi,
 505         .set_affinity   = sun4v_virt_set_affinity,
 506 };
 507
 508 static void pre_flow_handler(unsigned int virt_irq,
 509                                       struct irq_desc *desc)
 510 {
 511         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 512         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 513
 514         data->pre_handler(ino, data->arg1, data->arg2);
 515
 516         handle_fasteoi_irq(virt_irq, desc);
 517 }
 518
 519 void irq_install_pre_handler(int virt_irq,
 520                              void (*func)(unsigned int, void *, void *),
 521                              void *arg1, void *arg2)
 522 {
 523         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 524         struct irq_desc *desc = irq_desc + virt_irq;
 525
 526         data->pre_handler = func;
 527         data->arg1 = arg1;
 528         data->arg2 = arg2;
 529
 530         desc->handle_irq = pre_flow_handler;
 531 }
 532
 533 unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
 534 {
 535         struct ino_bucket *bucket;
 536         struct irq_handler_data *data;
 537         unsigned int virt_irq;
 538         int ino;
 539
 540         BUG_ON(tlb_type == hypervisor);
 541
 542         ino = (upa_readq(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
 543         bucket = &ivector_table[ino];
 544         virt_irq = bucket_get_virt_irq(__pa(bucket));
 545         if (!virt_irq) {
 546                 virt_irq = virt_irq_alloc(0, ino);
 547                 bucket_set_virt_irq(__pa(bucket), virt_irq);
 548                 set_irq_chip_and_handler_name(virt_irq,
 549                                               &sun4u_irq,
 550                                               handle_fasteoi_irq,
 551                                               "IVEC");
 552         }
 553
 554         data = get_irq_chip_data(virt_irq);
 555         if (unlikely(data))
 556                 goto out;
 557
 558         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 559         if (unlikely(!data)) {
 560                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 561                 prom_halt();
 562         }
 563         set_irq_chip_data(virt_irq, data);
 564
 565         data->imap  = imap;
 566         data->iclr  = iclr;
 567
 568 out:
 569         return virt_irq;
 570 }
 571
 572 static unsigned int sun4v_build_common(unsigned long sysino,
 573                                        struct irq_chip *chip)
 574 {
 575         struct ino_bucket *bucket;
 576         struct irq_handler_data *data;
 577         unsigned int virt_irq;
 578
 579         BUG_ON(tlb_type != hypervisor);
 580
 581         bucket = &ivector_table[sysino];
 582         virt_irq = bucket_get_virt_irq(__pa(bucket));
 583         if (!virt_irq) {
 584                 virt_irq = virt_irq_alloc(0, sysino);
 585                 bucket_set_virt_irq(__pa(bucket), virt_irq);
 586                 set_irq_chip_and_handler_name(virt_irq, chip,
 587                                               handle_fasteoi_irq,
 588                                               "IVEC");
 589         }
 590
 591         data = get_irq_chip_data(virt_irq);
 592         if (unlikely(data))
 593                 goto out;
 594
 595         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 596         if (unlikely(!data)) {
 597                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 598                 prom_halt();
 599         }
 600         set_irq_chip_data(virt_irq, data);
 601
 602         /* Catch accidental accesses to these things.  IMAP/ICLR handling
 603          * is done by hypervisor calls on sun4v platforms, not by direct
 604          * register accesses.
 605          */
 606         data->imap = ~0UL;
 607         data->iclr = ~0UL;
 608
 609 out:
 610         return virt_irq;
 611 }
 612
 613 unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino)
 614 {
 615         unsigned long sysino = sun4v_devino_to_sysino(devhandle, devino);
 616
 617         return sun4v_build_common(sysino, &sun4v_irq);
 618 }
 619
 620 unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino)
 621 {
 622         struct irq_handler_data *data;
 623         unsigned long hv_err, cookie;
 624         struct ino_bucket *bucket;
 625         struct irq_desc *desc;
 626         unsigned int virt_irq;
 627
 628         bucket = kzalloc(sizeof(struct ino_bucket), GFP_ATOMIC);
 629         if (unlikely(!bucket))
 630                 return 0;
 631         __flush_dcache_range((unsigned long) bucket,
 632                              ((unsigned long) bucket +
 633                               sizeof(struct ino_bucket)));
 634
 635         virt_irq = virt_irq_alloc(devhandle, devino);
 636         bucket_set_virt_irq(__pa(bucket), virt_irq);
 637
 638         set_irq_chip_and_handler_name(virt_irq, &sun4v_virq,
 639                                       handle_fasteoi_irq,
 640                                       "IVEC");
 641
 642         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 643         if (unlikely(!data))
 644                 return 0;
 645
 646         /* In order to make the LDC channel startup sequence easier,
 647          * especially wrt. locking, we do not let request_irq() enable
 648          * the interrupt.
 649          */
 650         desc = irq_desc + virt_irq;
 651         desc->status |= IRQ_NOAUTOEN;
 652
 653         set_irq_chip_data(virt_irq, data);
 654
 655         /* Catch accidental accesses to these things.  IMAP/ICLR handling
 656          * is done by hypervisor calls on sun4v platforms, not by direct
 657          * register accesses.
 658          */
 659         data->imap = ~0UL;
 660         data->iclr = ~0UL;
 661
 662         cookie = ~__pa(bucket);
 663         hv_err = sun4v_vintr_set_cookie(devhandle, devino, cookie);
 664         if (hv_err) {
 665                 prom_printf("IRQ: Fatal, cannot set cookie for [%x:%x] "
 666                             "err=%lu\n", devhandle, devino, hv_err);
 667                 prom_halt();
 668         }
 669
 670         return virt_irq;
 671 }
 672
 673 void ack_bad_irq(unsigned int virt_irq)
 674 {
 675         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 676
 677         if (!ino)
 678                 ino = 0xdeadbeef;
 679
 680         printk(KERN_CRIT "Unexpected IRQ from ino[%x] virt_irq[%u]\n",
 681                ino, virt_irq);
 682 }
 683
 684 void *hardirq_stack[NR_CPUS];
 685 void *softirq_stack[NR_CPUS];
 686
 687 static __attribute__((always_inline)) void *set_hardirq_stack(void)
 688 {
 689         void *orig_sp, *sp = hardirq_stack[smp_processor_id()];
 690
 691         __asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp));
 692         if (orig_sp < sp ||
 693             orig_sp > (sp + THREAD_SIZE)) {
 694                 sp += THREAD_SIZE - 192 - STACK_BIAS;
 695                 __asm__ __volatile__("mov %0, %%sp" : : "r" (sp));
 696         }
 697
 698         return orig_sp;
 699 }
 700 static __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp)
 701 {
 702         __asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp));
 703 }
 704
 705 void handler_irq(int irq, struct pt_regs *regs)
 706 {
 707         unsigned long pstate, bucket_pa;
 708         struct pt_regs *old_regs;
 709         void *orig_sp;
 710
 711         clear_softint(1 << irq);
 712
 713         old_regs = set_irq_regs(regs);
 714         irq_enter();
 715
 716         /* Grab an atomic snapshot of the pending IVECs.  */
 717         __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
 718                              "wrpr      %0, %3, %%pstate\n\t"
 719                              "ldx       [%2], %1\n\t"
 720                              "stx       %%g0, [%2]\n\t"
 721                              "wrpr      %0, 0x0, %%pstate\n\t"
 722                              : "=&r" (pstate), "=&r" (bucket_pa)
 723                              : "r" (irq_work_pa(smp_processor_id())),
 724                                "i" (PSTATE_IE)
 725                              : "memory");
 726
 727         orig_sp = set_hardirq_stack();
 728
 729         while (bucket_pa) {
 730                 struct irq_desc *desc;
 731                 unsigned long next_pa;
 732                 unsigned int virt_irq;
 733
 734                 next_pa = bucket_get_chain_pa(bucket_pa);
 735                 virt_irq = bucket_get_virt_irq(bucket_pa);
 736                 bucket_clear_chain_pa(bucket_pa);
 737
 738                 desc = irq_desc + virt_irq;
 739
 740                 desc->handle_irq(virt_irq, desc);
 741
 742                 bucket_pa = next_pa;
 743         }
 744
 745         restore_hardirq_stack(orig_sp);
 746
 747         irq_exit();
 748         set_irq_regs(old_regs);
 749 }
 750
 751 void do_softirq(void)
 752 {
 753         unsigned long flags;
 754
 755         if (in_interrupt())
 756                 return;
 757
 758         local_irq_save(flags);
 759
 760         if (local_softirq_pending()) {
 761                 void *orig_sp, *sp = softirq_stack[smp_processor_id()];
 762
 763                 sp += THREAD_SIZE - 192 - STACK_BIAS;
 764
 765                 __asm__ __volatile__("mov %%sp, %0\n\t"
 766                                      "mov %1, %%sp"
 767                                      : "=&r" (orig_sp)
 768                                      : "r" (sp));
 769                 __do_softirq();
 770                 __asm__ __volatile__("mov %0, %%sp"
 771                                      : : "r" (orig_sp));
 772         }
 773
 774         local_irq_restore(flags);
 775 }
 776
 777 #ifdef CONFIG_HOTPLUG_CPU
 778 void fixup_irqs(void)
 779 {
 780         unsigned int irq;
 781
 782         for (irq = 0; irq < NR_IRQS; irq++) {
 783                 unsigned long flags;
 784
 785                 spin_lock_irqsave(&irq_desc[irq].lock, flags);
 786                 if (irq_desc[irq].action &&
 787                     !(irq_desc[irq].status & IRQ_PER_CPU)) {
 788                         if (irq_desc[irq].chip->set_affinity)
 789                                 irq_desc[irq].chip->set_affinity(irq,
 790                                         irq_desc[irq].affinity);
 791                 }
 792                 spin_unlock_irqrestore(&irq_desc[irq].lock, flags);
 793         }
 794
 795         tick_ops->disable_irq();
 796 }
 797 #endif
 798
 799 struct sun5_timer {
 800         u64     count0;
 801         u64     limit0;
 802         u64     count1;
 803         u64     limit1;
 804 };
 805
 806 static struct sun5_timer *prom_timers;
 807 static u64 prom_limit0, prom_limit1;
 808
 809 static void map_prom_timers(void)
 810 {
 811         struct device_node *dp;
 812         const unsigned int *addr;
 813
 814         /* PROM timer node hangs out in the top level of device siblings... */
 815         dp = of_find_node_by_path("/");
 816         dp = dp->child;
 817         while (dp) {
 818                 if (!strcmp(dp->name, "counter-timer"))
 819                         break;
 820                 dp = dp->sibling;
 821         }
 822
 823         /* Assume if node is not present, PROM uses different tick mechanism
 824          * which we should not care about.
 825          */
 826         if (!dp) {
 827                 prom_timers = (struct sun5_timer *) 0;
 828                 return;
 829         }
 830
 831         /* If PROM is really using this, it must be mapped by him. */
 832         addr = of_get_property(dp, "address", NULL);
 833         if (!addr) {
 834                 prom_printf("PROM does not have timer mapped, trying to continue.\n");
 835                 prom_timers = (struct sun5_timer *) 0;
 836                 return;
 837         }
 838         prom_timers = (struct sun5_timer *) ((unsigned long)addr[0]);
 839 }
 840
 841 static void kill_prom_timer(void)
 842 {
 843         if (!prom_timers)
 844                 return;
 845
 846         /* Save them away for later. */
 847         prom_limit0 = prom_timers->limit0;
 848         prom_limit1 = prom_timers->limit1;
 849
 850         /* Just as in sun4c/sun4m PROM uses timer which ticks at IRQ 14.
 851          * We turn both off here just to be paranoid.
 852          */
 853         prom_timers->limit0 = 0;
 854         prom_timers->limit1 = 0;
 855
 856         /* Wheee, eat the interrupt packet too... */
 857         __asm__ __volatile__(
 858 "       mov     0x40, %%g2\n"
 859 "       ldxa    [%%g0] %0, %%g1\n"
 860 "       ldxa    [%%g2] %1, %%g1\n"
 861 "       stxa    %%g0, [%%g0] %0\n"
 862 "       membar  #Sync\n"
 863         : /* no outputs */
 864         : "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R)
 865         : "g1", "g2");
 866 }
 867
 868 void init_irqwork_curcpu(void)
 869 {
 870         int cpu = hard_smp_processor_id();
 871
 872         trap_block[cpu].irq_worklist_pa = 0UL;
 873 }
 874
 875 /* Please be very careful with register_one_mondo() and
 876  * sun4v_register_mondo_queues().
 877  *
 878  * On SMP this gets invoked from the CPU trampoline before
 879  * the cpu has fully taken over the trap table from OBP,
 880  * and it's kernel stack + %g6 thread register state is
 881  * not fully cooked yet.
 882  *
 883  * Therefore you cannot make any OBP calls, not even prom_printf,
 884  * from these two routines.
 885  */
 886 static void __cpuinit register_one_mondo(unsigned long paddr, unsigned long type, unsigned long qmask)
 887 {
 888         unsigned long num_entries = (qmask + 1) / 64;
 889         unsigned long status;
 890
 891         status = sun4v_cpu_qconf(type, paddr, num_entries);
 892         if (status != HV_EOK) {
 893                 prom_printf("SUN4V: sun4v_cpu_qconf(%lu:%lx:%lu) failed, "
 894                             "err %lu\n", type, paddr, num_entries, status);
 895                 prom_halt();
 896         }
 897 }
 898
 899 void __cpuinit sun4v_register_mondo_queues(int this_cpu)
 900 {
 901         struct trap_per_cpu *tb = &trap_block[this_cpu];
 902
 903         register_one_mondo(tb->cpu_mondo_pa, HV_CPU_QUEUE_CPU_MONDO,
 904                            tb->cpu_mondo_qmask);
 905         register_one_mondo(tb->dev_mondo_pa, HV_CPU_QUEUE_DEVICE_MONDO,
 906                            tb->dev_mondo_qmask);
 907         register_one_mondo(tb->resum_mondo_pa, HV_CPU_QUEUE_RES_ERROR,
 908                            tb->resum_qmask);
 909         register_one_mondo(tb->nonresum_mondo_pa, HV_CPU_QUEUE_NONRES_ERROR,
 910                            tb->nonresum_qmask);
 911 }
 912
 913 static void __init alloc_one_mondo(unsigned long *pa_ptr, unsigned long qmask)
 914 {
 915         unsigned long size = PAGE_ALIGN(qmask + 1);
 916         void *p = __alloc_bootmem(size, size, 0);
 917         if (!p) {
 918                 prom_printf("SUN4V: Error, cannot allocate mondo queue.\n");
 919                 prom_halt();
 920         }
 921
 922         *pa_ptr = __pa(p);
 923 }
 924
 925 static void __init alloc_one_kbuf(unsigned long *pa_ptr, unsigned long qmask)
 926 {
 927         unsigned long size = PAGE_ALIGN(qmask + 1);
 928         void *p = __alloc_bootmem(size, size, 0);
 929
 930         if (!p) {
 931                 prom_printf("SUN4V: Error, cannot allocate kbuf page.\n");
 932                 prom_halt();
 933         }
 934
 935         *pa_ptr = __pa(p);
 936 }
 937
 938 static void __init init_cpu_send_mondo_info(struct trap_per_cpu *tb)
 939 {
 940 #ifdef CONFIG_SMP
 941         void *page;
 942
 943         BUILD_BUG_ON((NR_CPUS * sizeof(u16)) > (PAGE_SIZE - 64));
 944
 945         page = alloc_bootmem_pages(PAGE_SIZE);
 946         if (!page) {
 947                 prom_printf("SUN4V: Error, cannot allocate cpu mondo page.\n");
 948                 prom_halt();
 949         }
 950
 951         tb->cpu_mondo_block_pa = __pa(page);
 952         tb->cpu_list_pa = __pa(page + 64);
 953 #endif
 954 }
 955
 956 /* Allocate mondo and error queues for all possible cpus.  */
 957 static void __init sun4v_init_mondo_queues(void)
 958 {
 959         int cpu;
 960
 961         for_each_possible_cpu(cpu) {
 962                 struct trap_per_cpu *tb = &trap_block[cpu];
 963
 964                 alloc_one_mondo(&tb->cpu_mondo_pa, tb->cpu_mondo_qmask);
 965                 alloc_one_mondo(&tb->dev_mondo_pa, tb->dev_mondo_qmask);
 966                 alloc_one_mondo(&tb->resum_mondo_pa, tb->resum_qmask);
 967                 alloc_one_kbuf(&tb->resum_kernel_buf_pa, tb->resum_qmask);
 968                 alloc_one_mondo(&tb->nonresum_mondo_pa, tb->nonresum_qmask);
 969                 alloc_one_kbuf(&tb->nonresum_kernel_buf_pa,
 970                                tb->nonresum_qmask);
 971         }
 972 }
 973
 974 static void __init init_send_mondo_info(void)
 975 {
 976         int cpu;
 977
 978         for_each_possible_cpu(cpu) {
 979                 struct trap_per_cpu *tb = &trap_block[cpu];
 980
 981                 init_cpu_send_mondo_info(tb);
 982         }
 983 }
 984
 985 static struct irqaction timer_irq_action = {
 986         .name = "timer",
 987 };
 988
 989 /* Only invoked on boot processor. */
 990 void __init init_IRQ(void)
 991 {
 992         unsigned long size;
 993
 994         map_prom_timers();
 995         kill_prom_timer();
 996
 997         size = sizeof(struct ino_bucket) * NUM_IVECS;
 998         ivector_table = alloc_bootmem(size);
 999         if (!ivector_table) {
1000                 prom_printf("Fatal error, cannot allocate ivector_table\n");
1001                 prom_halt();
1002         }
1003         __flush_dcache_range((unsigned long) ivector_table,
1004                              ((unsigned long) ivector_table) + size);
1005
1006         ivector_table_pa = __pa(ivector_table);
1007
1008         if (tlb_type == hypervisor)
1009                 sun4v_init_mondo_queues();
1010
1011         init_send_mondo_info();
1012
1013         if (tlb_type == hypervisor) {
1014                 /* Load up the boot cpu's entries.  */
1015                 sun4v_register_mondo_queues(hard_smp_processor_id());
1016         }
1017
1018         /* We need to clear any IRQ's pending in the soft interrupt
1019          * registers, a spurious one could be left around from the
1020          * PROM timer which we just disabled.
1021          */
1022         clear_softint(get_softint());
1023
1024         /* Now that ivector table is initialized, it is safe
1025          * to receive IRQ vector traps.  We will normally take
1026          * one or two right now, in case some device PROM used
1027          * to boot us wants to speak to us.  We just ignore them.
1028          */
1029         __asm__ __volatile__("rdpr      %%pstate, %%g1\n\t"
1030                              "or        %%g1, %0, %%g1\n\t"
1031                              "wrpr      %%g1, 0x0, %%pstate"
1032                              : /* No outputs */
1033                              : "i" (PSTATE_IE)
1034                              : "g1");
1035
1036         irq_desc[0].action = &timer_irq_action;
1037 }