arch/sparc/kernel/irq_64.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/linkage.h>
  11 #include <linux/ptrace.h>
  12 #include <linux/errno.h>
  13 #include <linux/kernel_stat.h>
  14 #include <linux/signal.h>
  15 #include <linux/mm.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/slab.h>
  18 #include <linux/random.h>
  19 #include <linux/init.h>
  20 #include <linux/delay.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/bootmem.h>
  24 #include <linux/irq.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/iommu.h>
  33 #include <asm/upa.h>
  34 #include <asm/oplib.h>
  35 #include <asm/prom.h>
  36 #include <asm/timer.h>
  37 #include <asm/smp.h>
  38 #include <asm/starfire.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/cache.h>
  41 #include <asm/cpudata.h>
  42 #include <asm/auxio.h>
  43 #include <asm/head.h>
  44 #include <asm/hypervisor.h>
  45 #include <asm/cacheflush.h>
  46
  47 #include "entry.h"
  48
  49 #define NUM_IVECS       (IMAP_INR + 1)
  50
  51 struct ino_bucket *ivector_table;
  52 unsigned long ivector_table_pa;
  53
  54 /* On several sun4u processors, it is illegal to mix bypass and
  55  * non-bypass accesses.  Therefore we access all INO buckets
  56  * using bypass accesses only.
  57  */
  58 static unsigned long bucket_get_chain_pa(unsigned long bucket_pa)
  59 {
  60         unsigned long ret;
  61
  62         __asm__ __volatile__("ldxa      [%1] %2, %0"
  63                              : "=&r" (ret)
  64                              : "r" (bucket_pa +
  65                                     offsetof(struct ino_bucket,
  66                                              __irq_chain_pa)),
  67                                "i" (ASI_PHYS_USE_EC));
  68
  69         return ret;
  70 }
  71
  72 static void bucket_clear_chain_pa(unsigned long bucket_pa)
  73 {
  74         __asm__ __volatile__("stxa      %%g0, [%0] %1"
  75                              : /* no outputs */
  76                              : "r" (bucket_pa +
  77                                     offsetof(struct ino_bucket,
  78                                              __irq_chain_pa)),
  79                                "i" (ASI_PHYS_USE_EC));
  80 }
  81
  82 static unsigned int bucket_get_virt_irq(unsigned long bucket_pa)
  83 {
  84         unsigned int ret;
  85
  86         __asm__ __volatile__("lduwa     [%1] %2, %0"
  87                              : "=&r" (ret)
  88                              : "r" (bucket_pa +
  89                                     offsetof(struct ino_bucket,
  90                                              __virt_irq)),
  91                                "i" (ASI_PHYS_USE_EC));
  92
  93         return ret;
  94 }
  95
  96 static void bucket_set_virt_irq(unsigned long bucket_pa,
  97                                 unsigned int virt_irq)
  98 {
  99         __asm__ __volatile__("stwa      %0, [%1] %2"
 100                              : /* no outputs */
 101                              : "r" (virt_irq),
 102                                "r" (bucket_pa +
 103                                     offsetof(struct ino_bucket,
 104                                              __virt_irq)),
 105                                "i" (ASI_PHYS_USE_EC));
 106 }
 107
 108 #define irq_work_pa(__cpu)      &(trap_block[(__cpu)].irq_worklist_pa)
 109
 110 static struct {
 111         unsigned int dev_handle;
 112         unsigned int dev_ino;
 113         unsigned int in_use;
 114 } virt_irq_table[NR_IRQS];
 115 static DEFINE_SPINLOCK(virt_irq_alloc_lock);
 116
 117 unsigned char virt_irq_alloc(unsigned int dev_handle,
 118                              unsigned int dev_ino)
 119 {
 120         unsigned long flags;
 121         unsigned char ent;
 122
 123         BUILD_BUG_ON(NR_IRQS >= 256);
 124
 125         spin_lock_irqsave(&virt_irq_alloc_lock, flags);
 126
 127         for (ent = 1; ent < NR_IRQS; ent++) {
 128                 if (!virt_irq_table[ent].in_use)
 129                         break;
 130         }
 131         if (ent >= NR_IRQS) {
 132                 printk(KERN_ERR "IRQ: Out of virtual IRQs.\n");
 133                 ent = 0;
 134         } else {
 135                 virt_irq_table[ent].dev_handle = dev_handle;
 136                 virt_irq_table[ent].dev_ino = dev_ino;
 137                 virt_irq_table[ent].in_use = 1;
 138         }
 139
 140         spin_unlock_irqrestore(&virt_irq_alloc_lock, flags);
 141
 142         return ent;
 143 }
 144
 145 #ifdef CONFIG_PCI_MSI
 146 void virt_irq_free(unsigned int virt_irq)
 147 {
 148         unsigned long flags;
 149
 150         if (virt_irq >= NR_IRQS)
 151                 return;
 152
 153         spin_lock_irqsave(&virt_irq_alloc_lock, flags);
 154
 155         virt_irq_table[virt_irq].in_use = 0;
 156
 157         spin_unlock_irqrestore(&virt_irq_alloc_lock, flags);
 158 }
 159 #endif
 160
 161 /*
 162  * /proc/interrupts printing:
 163  */
 164
 165 int show_interrupts(struct seq_file *p, void *v)
 166 {
 167         int i = *(loff_t *) v, j;
 168         struct irqaction * action;
 169         unsigned long flags;
 170
 171         if (i == 0) {
 172                 seq_printf(p, "           ");
 173                 for_each_online_cpu(j)
 174                         seq_printf(p, "CPU%d       ",j);
 175                 seq_putc(p, '\n');
 176         }
 177
 178         if (i < NR_IRQS) {
 179                 spin_lock_irqsave(&irq_desc[i].lock, flags);
 180                 action = irq_desc[i].action;
 181                 if (!action)
 182                         goto skip;
 183                 seq_printf(p, "%3d: ",i);
 184 #ifndef CONFIG_SMP
 185                 seq_printf(p, "%10u ", kstat_irqs(i));
 186 #else
 187                 for_each_online_cpu(j)
 188                         seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
 189 #endif
 190                 seq_printf(p, " %9s", irq_desc[i].chip->typename);
 191                 seq_printf(p, "  %s", action->name);
 192
 193                 for (action=action->next; action; action = action->next)
 194                         seq_printf(p, ", %s", action->name);
 195
 196                 seq_putc(p, '\n');
 197 skip:
 198                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 199         } else if (i == NR_IRQS) {
 200                 seq_printf(p, "NMI: ");
 201                 for_each_online_cpu(j)
 202                         seq_printf(p, "%10u ", cpu_data(j).__nmi_count);
 203                 seq_printf(p, "     Non-maskable interrupts\n");
 204         }
 205         return 0;
 206 }
 207
 208 static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid)
 209 {
 210         unsigned int tid;
 211
 212         if (this_is_starfire) {
 213                 tid = starfire_translate(imap, cpuid);
 214                 tid <<= IMAP_TID_SHIFT;
 215                 tid &= IMAP_TID_UPA;
 216         } else {
 217                 if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 218                         unsigned long ver;
 219
 220                         __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 221                         if ((ver >> 32UL) == __JALAPENO_ID ||
 222                             (ver >> 32UL) == __SERRANO_ID) {
 223                                 tid = cpuid << IMAP_TID_SHIFT;
 224                                 tid &= IMAP_TID_JBUS;
 225                         } else {
 226                                 unsigned int a = cpuid & 0x1f;
 227                                 unsigned int n = (cpuid >> 5) & 0x1f;
 228
 229                                 tid = ((a << IMAP_AID_SHIFT) |
 230                                        (n << IMAP_NID_SHIFT));
 231                                 tid &= (IMAP_AID_SAFARI |
 232                                         IMAP_NID_SAFARI);;
 233                         }
 234                 } else {
 235                         tid = cpuid << IMAP_TID_SHIFT;
 236                         tid &= IMAP_TID_UPA;
 237                 }
 238         }
 239
 240         return tid;
 241 }
 242
 243 struct irq_handler_data {
 244         unsigned long   iclr;
 245         unsigned long   imap;
 246
 247         void            (*pre_handler)(unsigned int, void *, void *);
 248         void            *arg1;
 249         void            *arg2;
 250 };
 251
 252 #ifdef CONFIG_SMP
 253 static int irq_choose_cpu(unsigned int virt_irq)
 254 {
 255         cpumask_t mask;
 256         int cpuid;
 257
 258         cpumask_copy(&mask, irq_desc[virt_irq].affinity);
 259         if (cpus_equal(mask, CPU_MASK_ALL)) {
 260                 static int irq_rover;
 261                 static DEFINE_SPINLOCK(irq_rover_lock);
 262                 unsigned long flags;
 263
 264                 /* Round-robin distribution... */
 265         do_round_robin:
 266                 spin_lock_irqsave(&irq_rover_lock, flags);
 267
 268                 while (!cpu_online(irq_rover)) {
 269                         if (++irq_rover >= NR_CPUS)
 270                                 irq_rover = 0;
 271                 }
 272                 cpuid = irq_rover;
 273                 do {
 274                         if (++irq_rover >= NR_CPUS)
 275                                 irq_rover = 0;
 276                 } while (!cpu_online(irq_rover));
 277
 278                 spin_unlock_irqrestore(&irq_rover_lock, flags);
 279         } else {
 280                 cpumask_t tmp;
 281
 282                 cpus_and(tmp, cpu_online_map, mask);
 283
 284                 if (cpus_empty(tmp))
 285                         goto do_round_robin;
 286
 287                 cpuid = first_cpu(tmp);
 288         }
 289
 290         return cpuid;
 291 }
 292 #else
 293 static int irq_choose_cpu(unsigned int virt_irq)
 294 {
 295         return real_hard_smp_processor_id();
 296 }
 297 #endif
 298
 299 static void sun4u_irq_enable(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 cpuid, imap, val;
 305                 unsigned int tid;
 306
 307                 cpuid = irq_choose_cpu(virt_irq);
 308                 imap = data->imap;
 309
 310                 tid = sun4u_compute_tid(imap, cpuid);
 311
 312                 val = upa_readq(imap);
 313                 val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS |
 314                          IMAP_AID_SAFARI | IMAP_NID_SAFARI);
 315                 val |= tid | IMAP_VALID;
 316                 upa_writeq(val, imap);
 317                 upa_writeq(ICLR_IDLE, data->iclr);
 318         }
 319 }
 320
 321 static void sun4u_set_affinity(unsigned int virt_irq,
 322                                const struct cpumask *mask)
 323 {
 324         sun4u_irq_enable(virt_irq);
 325 }
 326
 327 /* Don't do anything.  The desc->status check for IRQ_DISABLED in
 328  * handler_irq() will skip the handler call and that will leave the
 329  * interrupt in the sent state.  The next ->enable() call will hit the
 330  * ICLR register to reset the state machine.
 331  *
 332  * This scheme is necessary, instead of clearing the Valid bit in the
 333  * IMAP register, to handle the case of IMAP registers being shared by
 334  * multiple INOs (and thus ICLR registers).  Since we use a different
 335  * virtual IRQ for each shared IMAP instance, the generic code thinks
 336  * there is only one user so it prematurely calls ->disable() on
 337  * free_irq().
 338  *
 339  * We have to provide an explicit ->disable() method instead of using
 340  * NULL to get the default.  The reason is that if the generic code
 341  * sees that, it also hooks up a default ->shutdown method which
 342  * invokes ->mask() which we do not want.  See irq_chip_set_defaults().
 343  */
 344 static void sun4u_irq_disable(unsigned int virt_irq)
 345 {
 346 }
 347
 348 static void sun4u_irq_eoi(unsigned int virt_irq)
 349 {
 350         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 351         struct irq_desc *desc = irq_desc + virt_irq;
 352
 353         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 354                 return;
 355
 356         if (likely(data))
 357                 upa_writeq(ICLR_IDLE, data->iclr);
 358 }
 359
 360 static void sun4v_irq_enable(unsigned int virt_irq)
 361 {
 362         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 363         unsigned long cpuid = irq_choose_cpu(virt_irq);
 364         int err;
 365
 366         err = sun4v_intr_settarget(ino, cpuid);
 367         if (err != HV_EOK)
 368                 printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
 369                        "err(%d)\n", ino, cpuid, err);
 370         err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 371         if (err != HV_EOK)
 372                 printk(KERN_ERR "sun4v_intr_setstate(%x): "
 373                        "err(%d)\n", ino, err);
 374         err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED);
 375         if (err != HV_EOK)
 376                 printk(KERN_ERR "sun4v_intr_setenabled(%x): err(%d)\n",
 377                        ino, err);
 378 }
 379
 380 static void sun4v_set_affinity(unsigned int virt_irq,
 381                                const struct cpumask *mask)
 382 {
 383         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 384         unsigned long cpuid = irq_choose_cpu(virt_irq);
 385         int err;
 386
 387         err = sun4v_intr_settarget(ino, cpuid);
 388         if (err != HV_EOK)
 389                 printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
 390                        "err(%d)\n", ino, cpuid, err);
 391 }
 392
 393 static void sun4v_irq_disable(unsigned int virt_irq)
 394 {
 395         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 396         int err;
 397
 398         err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED);
 399         if (err != HV_EOK)
 400                 printk(KERN_ERR "sun4v_intr_setenabled(%x): "
 401                        "err(%d)\n", ino, err);
 402 }
 403
 404 static void sun4v_irq_eoi(unsigned int virt_irq)
 405 {
 406         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 407         struct irq_desc *desc = irq_desc + virt_irq;
 408         int err;
 409
 410         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 411                 return;
 412
 413         err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 414         if (err != HV_EOK)
 415                 printk(KERN_ERR "sun4v_intr_setstate(%x): "
 416                        "err(%d)\n", ino, err);
 417 }
 418
 419 static void sun4v_virq_enable(unsigned int virt_irq)
 420 {
 421         unsigned long cpuid, dev_handle, dev_ino;
 422         int err;
 423
 424         cpuid = irq_choose_cpu(virt_irq);
 425
 426         dev_handle = virt_irq_table[virt_irq].dev_handle;
 427         dev_ino = virt_irq_table[virt_irq].dev_ino;
 428
 429         err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
 430         if (err != HV_EOK)
 431                 printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
 432                        "err(%d)\n",
 433                        dev_handle, dev_ino, cpuid, err);
 434         err = sun4v_vintr_set_state(dev_handle, dev_ino,
 435                                     HV_INTR_STATE_IDLE);
 436         if (err != HV_EOK)
 437                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 438                        "HV_INTR_STATE_IDLE): err(%d)\n",
 439                        dev_handle, dev_ino, err);
 440         err = sun4v_vintr_set_valid(dev_handle, dev_ino,
 441                                     HV_INTR_ENABLED);
 442         if (err != HV_EOK)
 443                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 444                        "HV_INTR_ENABLED): err(%d)\n",
 445                        dev_handle, dev_ino, err);
 446 }
 447
 448 static void sun4v_virt_set_affinity(unsigned int virt_irq,
 449                                     const struct cpumask *mask)
 450 {
 451         unsigned long cpuid, dev_handle, dev_ino;
 452         int err;
 453
 454         cpuid = irq_choose_cpu(virt_irq);
 455
 456         dev_handle = virt_irq_table[virt_irq].dev_handle;
 457         dev_ino = virt_irq_table[virt_irq].dev_ino;
 458
 459         err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
 460         if (err != HV_EOK)
 461                 printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
 462                        "err(%d)\n",
 463                        dev_handle, dev_ino, cpuid, err);
 464 }
 465
 466 static void sun4v_virq_disable(unsigned int virt_irq)
 467 {
 468         unsigned long dev_handle, dev_ino;
 469         int err;
 470
 471         dev_handle = virt_irq_table[virt_irq].dev_handle;
 472         dev_ino = virt_irq_table[virt_irq].dev_ino;
 473
 474         err = sun4v_vintr_set_valid(dev_handle, dev_ino,
 475                                     HV_INTR_DISABLED);
 476         if (err != HV_EOK)
 477                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 478                        "HV_INTR_DISABLED): err(%d)\n",
 479                        dev_handle, dev_ino, err);
 480 }
 481
 482 static void sun4v_virq_eoi(unsigned int virt_irq)
 483 {
 484         struct irq_desc *desc = irq_desc + virt_irq;
 485         unsigned long dev_handle, dev_ino;
 486         int err;
 487
 488         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 489                 return;
 490
 491         dev_handle = virt_irq_table[virt_irq].dev_handle;
 492         dev_ino = virt_irq_table[virt_irq].dev_ino;
 493
 494         err = sun4v_vintr_set_state(dev_handle, dev_ino,
 495                                     HV_INTR_STATE_IDLE);
 496         if (err != HV_EOK)
 497                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 498                        "HV_INTR_STATE_IDLE): err(%d)\n",
 499                        dev_handle, dev_ino, err);
 500 }
 501
 502 static struct irq_chip sun4u_irq = {
 503         .typename       = "sun4u",
 504         .enable         = sun4u_irq_enable,
 505         .disable        = sun4u_irq_disable,
 506         .eoi            = sun4u_irq_eoi,
 507         .set_affinity   = sun4u_set_affinity,
 508 };
 509
 510 static struct irq_chip sun4v_irq = {
 511         .typename       = "sun4v",
 512         .enable         = sun4v_irq_enable,
 513         .disable        = sun4v_irq_disable,
 514         .eoi            = sun4v_irq_eoi,
 515         .set_affinity   = sun4v_set_affinity,
 516 };
 517
 518 static struct irq_chip sun4v_virq = {
 519         .typename       = "vsun4v",
 520         .enable         = sun4v_virq_enable,
 521         .disable        = sun4v_virq_disable,
 522         .eoi            = sun4v_virq_eoi,
 523         .set_affinity   = sun4v_virt_set_affinity,
 524 };
 525
 526 static void pre_flow_handler(unsigned int virt_irq,
 527                                       struct irq_desc *desc)
 528 {
 529         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 530         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 531
 532         data->pre_handler(ino, data->arg1, data->arg2);
 533
 534         handle_fasteoi_irq(virt_irq, desc);
 535 }
 536
 537 void irq_install_pre_handler(int virt_irq,
 538                              void (*func)(unsigned int, void *, void *),
 539                              void *arg1, void *arg2)
 540 {
 541         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 542         struct irq_desc *desc = irq_desc + virt_irq;
 543
 544         data->pre_handler = func;
 545         data->arg1 = arg1;
 546         data->arg2 = arg2;
 547
 548         desc->handle_irq = pre_flow_handler;
 549 }
 550
 551 unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
 552 {
 553         struct ino_bucket *bucket;
 554         struct irq_handler_data *data;
 555         unsigned int virt_irq;
 556         int ino;
 557
 558         BUG_ON(tlb_type == hypervisor);
 559
 560         ino = (upa_readq(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
 561         bucket = &ivector_table[ino];
 562         virt_irq = bucket_get_virt_irq(__pa(bucket));
 563         if (!virt_irq) {
 564                 virt_irq = virt_irq_alloc(0, ino);
 565                 bucket_set_virt_irq(__pa(bucket), virt_irq);
 566                 set_irq_chip_and_handler_name(virt_irq,
 567                                               &sun4u_irq,
 568                                               handle_fasteoi_irq,
 569                                               "IVEC");
 570         }
 571
 572         data = get_irq_chip_data(virt_irq);
 573         if (unlikely(data))
 574                 goto out;
 575
 576         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 577         if (unlikely(!data)) {
 578                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 579                 prom_halt();
 580         }
 581         set_irq_chip_data(virt_irq, data);
 582
 583         data->imap  = imap;
 584         data->iclr  = iclr;
 585
 586 out:
 587         return virt_irq;
 588 }
 589
 590 static unsigned int sun4v_build_common(unsigned long sysino,
 591                                        struct irq_chip *chip)
 592 {
 593         struct ino_bucket *bucket;
 594         struct irq_handler_data *data;
 595         unsigned int virt_irq;
 596
 597         BUG_ON(tlb_type != hypervisor);
 598
 599         bucket = &ivector_table[sysino];
 600         virt_irq = bucket_get_virt_irq(__pa(bucket));
 601         if (!virt_irq) {
 602                 virt_irq = virt_irq_alloc(0, sysino);
 603                 bucket_set_virt_irq(__pa(bucket), virt_irq);
 604                 set_irq_chip_and_handler_name(virt_irq, chip,
 605                                               handle_fasteoi_irq,
 606                                               "IVEC");
 607         }
 608
 609         data = get_irq_chip_data(virt_irq);
 610         if (unlikely(data))
 611                 goto out;
 612
 613         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 614         if (unlikely(!data)) {
 615                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 616                 prom_halt();
 617         }
 618         set_irq_chip_data(virt_irq, data);
 619
 620         /* Catch accidental accesses to these things.  IMAP/ICLR handling
 621          * is done by hypervisor calls on sun4v platforms, not by direct
 622          * register accesses.
 623          */
 624         data->imap = ~0UL;
 625         data->iclr = ~0UL;
 626
 627 out:
 628         return virt_irq;
 629 }
 630
 631 unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino)
 632 {
 633         unsigned long sysino = sun4v_devino_to_sysino(devhandle, devino);
 634
 635         return sun4v_build_common(sysino, &sun4v_irq);
 636 }
 637
 638 unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino)
 639 {
 640         struct irq_handler_data *data;
 641         unsigned long hv_err, cookie;
 642         struct ino_bucket *bucket;
 643         struct irq_desc *desc;
 644         unsigned int virt_irq;
 645
 646         bucket = kzalloc(sizeof(struct ino_bucket), GFP_ATOMIC);
 647         if (unlikely(!bucket))
 648                 return 0;
 649         __flush_dcache_range((unsigned long) bucket,
 650                              ((unsigned long) bucket +
 651                               sizeof(struct ino_bucket)));
 652
 653         virt_irq = virt_irq_alloc(devhandle, devino);
 654         bucket_set_virt_irq(__pa(bucket), virt_irq);
 655
 656         set_irq_chip_and_handler_name(virt_irq, &sun4v_virq,
 657                                       handle_fasteoi_irq,
 658                                       "IVEC");
 659
 660         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 661         if (unlikely(!data))
 662                 return 0;
 663
 664         /* In order to make the LDC channel startup sequence easier,
 665          * especially wrt. locking, we do not let request_irq() enable
 666          * the interrupt.
 667          */
 668         desc = irq_desc + virt_irq;
 669         desc->status |= IRQ_NOAUTOEN;
 670
 671         set_irq_chip_data(virt_irq, data);
 672
 673         /* Catch accidental accesses to these things.  IMAP/ICLR handling
 674          * is done by hypervisor calls on sun4v platforms, not by direct
 675          * register accesses.
 676          */
 677         data->imap = ~0UL;
 678         data->iclr = ~0UL;
 679
 680         cookie = ~__pa(bucket);
 681         hv_err = sun4v_vintr_set_cookie(devhandle, devino, cookie);
 682         if (hv_err) {
 683                 prom_printf("IRQ: Fatal, cannot set cookie for [%x:%x] "
 684                             "err=%lu\n", devhandle, devino, hv_err);
 685                 prom_halt();
 686         }
 687
 688         return virt_irq;
 689 }
 690
 691 void ack_bad_irq(unsigned int virt_irq)
 692 {
 693         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
 694
 695         if (!ino)
 696                 ino = 0xdeadbeef;
 697
 698         printk(KERN_CRIT "Unexpected IRQ from ino[%x] virt_irq[%u]\n",
 699                ino, virt_irq);
 700 }
 701
 702 void *hardirq_stack[NR_CPUS];
 703 void *softirq_stack[NR_CPUS];
 704
 705 static __attribute__((always_inline)) void *set_hardirq_stack(void)
 706 {
 707         void *orig_sp, *sp = hardirq_stack[smp_processor_id()];
 708
 709         __asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp));
 710         if (orig_sp < sp ||
 711             orig_sp > (sp + THREAD_SIZE)) {
 712                 sp += THREAD_SIZE - 192 - STACK_BIAS;
 713                 __asm__ __volatile__("mov %0, %%sp" : : "r" (sp));
 714         }
 715
 716         return orig_sp;
 717 }
 718 static __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp)
 719 {
 720         __asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp));
 721 }
 722
 723 void handler_irq(int irq, struct pt_regs *regs)
 724 {
 725         unsigned long pstate, bucket_pa;
 726         struct pt_regs *old_regs;
 727         void *orig_sp;
 728
 729         clear_softint(1 << irq);
 730
 731         old_regs = set_irq_regs(regs);
 732         irq_enter();
 733
 734         /* Grab an atomic snapshot of the pending IVECs.  */
 735         __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
 736                              "wrpr      %0, %3, %%pstate\n\t"
 737                              "ldx       [%2], %1\n\t"
 738                              "stx       %%g0, [%2]\n\t"
 739                              "wrpr      %0, 0x0, %%pstate\n\t"
 740                              : "=&r" (pstate), "=&r" (bucket_pa)
 741                              : "r" (irq_work_pa(smp_processor_id())),
 742                                "i" (PSTATE_IE)
 743                              : "memory");
 744
 745         orig_sp = set_hardirq_stack();
 746
 747         while (bucket_pa) {
 748                 struct irq_desc *desc;
 749                 unsigned long next_pa;
 750                 unsigned int virt_irq;
 751
 752                 next_pa = bucket_get_chain_pa(bucket_pa);
 753                 virt_irq = bucket_get_virt_irq(bucket_pa);
 754                 bucket_clear_chain_pa(bucket_pa);
 755
 756                 desc = irq_desc + virt_irq;
 757
 758                 if (!(desc->status & IRQ_DISABLED))
 759                         desc->handle_irq(virt_irq, desc);
 760
 761                 bucket_pa = next_pa;
 762         }
 763
 764         restore_hardirq_stack(orig_sp);
 765
 766         irq_exit();
 767         set_irq_regs(old_regs);
 768 }
 769
 770 void do_softirq(void)
 771 {
 772         unsigned long flags;
 773
 774         if (in_interrupt())
 775                 return;
 776
 777         local_irq_save(flags);
 778
 779         if (local_softirq_pending()) {
 780                 void *orig_sp, *sp = softirq_stack[smp_processor_id()];
 781
 782                 sp += THREAD_SIZE - 192 - STACK_BIAS;
 783
 784                 __asm__ __volatile__("mov %%sp, %0\n\t"
 785                                      "mov %1, %%sp"
 786                                      : "=&r" (orig_sp)
 787                                      : "r" (sp));
 788                 __do_softirq();
 789                 __asm__ __volatile__("mov %0, %%sp"
 790                                      : : "r" (orig_sp));
 791         }
 792
 793         local_irq_restore(flags);
 794 }
 795
 796 #ifdef CONFIG_HOTPLUG_CPU
 797 void fixup_irqs(void)
 798 {
 799         unsigned int irq;
 800
 801         for (irq = 0; irq < NR_IRQS; irq++) {
 802                 unsigned long flags;
 803
 804                 spin_lock_irqsave(&irq_desc[irq].lock, flags);
 805                 if (irq_desc[irq].action &&
 806                     !(irq_desc[irq].status & IRQ_PER_CPU)) {
 807                         if (irq_desc[irq].chip->set_affinity)
 808                                 irq_desc[irq].chip->set_affinity(irq,
 809                                         irq_desc[irq].affinity);
 810                 }
 811                 spin_unlock_irqrestore(&irq_desc[irq].lock, flags);
 812         }
 813
 814         tick_ops->disable_irq();
 815 }
 816 #endif
 817
 818 struct sun5_timer {
 819         u64     count0;
 820         u64     limit0;
 821         u64     count1;
 822         u64     limit1;
 823 };
 824
 825 static struct sun5_timer *prom_timers;
 826 static u64 prom_limit0, prom_limit1;
 827
 828 static void map_prom_timers(void)
 829 {
 830         struct device_node *dp;
 831         const unsigned int *addr;
 832
 833         /* PROM timer node hangs out in the top level of device siblings... */
 834         dp = of_find_node_by_path("/");
 835         dp = dp->child;
 836         while (dp) {
 837                 if (!strcmp(dp->name, "counter-timer"))
 838                         break;
 839                 dp = dp->sibling;
 840         }
 841
 842         /* Assume if node is not present, PROM uses different tick mechanism
 843          * which we should not care about.
 844          */
 845         if (!dp) {
 846                 prom_timers = (struct sun5_timer *) 0;
 847                 return;
 848         }
 849
 850         /* If PROM is really using this, it must be mapped by him. */
 851         addr = of_get_property(dp, "address", NULL);
 852         if (!addr) {
 853                 prom_printf("PROM does not have timer mapped, trying to continue.\n");
 854                 prom_timers = (struct sun5_timer *) 0;
 855                 return;
 856         }
 857         prom_timers = (struct sun5_timer *) ((unsigned long)addr[0]);
 858 }
 859
 860 static void kill_prom_timer(void)
 861 {
 862         if (!prom_timers)
 863                 return;
 864
 865         /* Save them away for later. */
 866         prom_limit0 = prom_timers->limit0;
 867         prom_limit1 = prom_timers->limit1;
 868
 869         /* Just as in sun4c/sun4m PROM uses timer which ticks at IRQ 14.
 870          * We turn both off here just to be paranoid.
 871          */
 872         prom_timers->limit0 = 0;
 873         prom_timers->limit1 = 0;
 874
 875         /* Wheee, eat the interrupt packet too... */
 876         __asm__ __volatile__(
 877 "       mov     0x40, %%g2\n"
 878 "       ldxa    [%%g0] %0, %%g1\n"
 879 "       ldxa    [%%g2] %1, %%g1\n"
 880 "       stxa    %%g0, [%%g0] %0\n"
 881 "       membar  #Sync\n"
 882         : /* no outputs */
 883         : "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R)
 884         : "g1", "g2");
 885 }
 886
 887 void notrace init_irqwork_curcpu(void)
 888 {
 889         int cpu = hard_smp_processor_id();
 890
 891         trap_block[cpu].irq_worklist_pa = 0UL;
 892 }
 893
 894 /* Please be very careful with register_one_mondo() and
 895  * sun4v_register_mondo_queues().
 896  *
 897  * On SMP this gets invoked from the CPU trampoline before
 898  * the cpu has fully taken over the trap table from OBP,
 899  * and it's kernel stack + %g6 thread register state is
 900  * not fully cooked yet.
 901  *
 902  * Therefore you cannot make any OBP calls, not even prom_printf,
 903  * from these two routines.
 904  */
 905 static void __cpuinit register_one_mondo(unsigned long paddr, unsigned long type, unsigned long qmask)
 906 {
 907         unsigned long num_entries = (qmask + 1) / 64;
 908         unsigned long status;
 909
 910         status = sun4v_cpu_qconf(type, paddr, num_entries);
 911         if (status != HV_EOK) {
 912                 prom_printf("SUN4V: sun4v_cpu_qconf(%lu:%lx:%lu) failed, "
 913                             "err %lu\n", type, paddr, num_entries, status);
 914                 prom_halt();
 915         }
 916 }
 917
 918 void __cpuinit notrace sun4v_register_mondo_queues(int this_cpu)
 919 {
 920         struct trap_per_cpu *tb = &trap_block[this_cpu];
 921
 922         register_one_mondo(tb->cpu_mondo_pa, HV_CPU_QUEUE_CPU_MONDO,
 923                            tb->cpu_mondo_qmask);
 924         register_one_mondo(tb->dev_mondo_pa, HV_CPU_QUEUE_DEVICE_MONDO,
 925                            tb->dev_mondo_qmask);
 926         register_one_mondo(tb->resum_mondo_pa, HV_CPU_QUEUE_RES_ERROR,
 927                            tb->resum_qmask);
 928         register_one_mondo(tb->nonresum_mondo_pa, HV_CPU_QUEUE_NONRES_ERROR,
 929                            tb->nonresum_qmask);
 930 }
 931
 932 static void __init alloc_one_mondo(unsigned long *pa_ptr, unsigned long qmask)
 933 {
 934         unsigned long size = PAGE_ALIGN(qmask + 1);
 935         void *p = __alloc_bootmem(size, size, 0);
 936         if (!p) {
 937                 prom_printf("SUN4V: Error, cannot allocate mondo queue.\n");
 938                 prom_halt();
 939         }
 940
 941         *pa_ptr = __pa(p);
 942 }
 943
 944 static void __init alloc_one_kbuf(unsigned long *pa_ptr, unsigned long qmask)
 945 {
 946         unsigned long size = PAGE_ALIGN(qmask + 1);
 947         void *p = __alloc_bootmem(size, size, 0);
 948
 949         if (!p) {
 950                 prom_printf("SUN4V: Error, cannot allocate kbuf page.\n");
 951                 prom_halt();
 952         }
 953
 954         *pa_ptr = __pa(p);
 955 }
 956
 957 static void __init init_cpu_send_mondo_info(struct trap_per_cpu *tb)
 958 {
 959 #ifdef CONFIG_SMP
 960         void *page;
 961
 962         BUILD_BUG_ON((NR_CPUS * sizeof(u16)) > (PAGE_SIZE - 64));
 963
 964         page = alloc_bootmem_pages(PAGE_SIZE);
 965         if (!page) {
 966                 prom_printf("SUN4V: Error, cannot allocate cpu mondo page.\n");
 967                 prom_halt();
 968         }
 969
 970         tb->cpu_mondo_block_pa = __pa(page);
 971         tb->cpu_list_pa = __pa(page + 64);
 972 #endif
 973 }
 974
 975 /* Allocate mondo and error queues for all possible cpus.  */
 976 static void __init sun4v_init_mondo_queues(void)
 977 {
 978         int cpu;
 979
 980         for_each_possible_cpu(cpu) {
 981                 struct trap_per_cpu *tb = &trap_block[cpu];
 982
 983                 alloc_one_mondo(&tb->cpu_mondo_pa, tb->cpu_mondo_qmask);
 984                 alloc_one_mondo(&tb->dev_mondo_pa, tb->dev_mondo_qmask);
 985                 alloc_one_mondo(&tb->resum_mondo_pa, tb->resum_qmask);
 986                 alloc_one_kbuf(&tb->resum_kernel_buf_pa, tb->resum_qmask);
 987                 alloc_one_mondo(&tb->nonresum_mondo_pa, tb->nonresum_qmask);
 988                 alloc_one_kbuf(&tb->nonresum_kernel_buf_pa,
 989                                tb->nonresum_qmask);
 990         }
 991 }
 992
 993 static void __init init_send_mondo_info(void)
 994 {
 995         int cpu;
 996
 997         for_each_possible_cpu(cpu) {
 998                 struct trap_per_cpu *tb = &trap_block[cpu];
 999
1000                 init_cpu_send_mondo_info(tb);
1001         }
1002 }
1003
1004 static struct irqaction timer_irq_action = {
1005         .name = "timer",
1006 };
1007
1008 /* Only invoked on boot processor. */
1009 void __init init_IRQ(void)
1010 {
1011         unsigned long size;
1012
1013         map_prom_timers();
1014         kill_prom_timer();
1015
1016         size = sizeof(struct ino_bucket) * NUM_IVECS;
1017         ivector_table = alloc_bootmem(size);
1018         if (!ivector_table) {
1019                 prom_printf("Fatal error, cannot allocate ivector_table\n");
1020                 prom_halt();
1021         }
1022         __flush_dcache_range((unsigned long) ivector_table,
1023                              ((unsigned long) ivector_table) + size);
1024
1025         ivector_table_pa = __pa(ivector_table);
1026
1027         if (tlb_type == hypervisor)
1028                 sun4v_init_mondo_queues();
1029
1030         init_send_mondo_info();
1031
1032         if (tlb_type == hypervisor) {
1033                 /* Load up the boot cpu's entries.  */
1034                 sun4v_register_mondo_queues(hard_smp_processor_id());
1035         }
1036
1037         /* We need to clear any IRQ's pending in the soft interrupt
1038          * registers, a spurious one could be left around from the
1039          * PROM timer which we just disabled.
1040          */
1041         clear_softint(get_softint());
1042
1043         /* Now that ivector table is initialized, it is safe
1044          * to receive IRQ vector traps.  We will normally take
1045          * one or two right now, in case some device PROM used
1046          * to boot us wants to speak to us.  We just ignore them.
1047          */
1048         __asm__ __volatile__("rdpr      %%pstate, %%g1\n\t"
1049                              "or        %%g1, %0, %%g1\n\t"
1050                              "wrpr      %%g1, 0x0, %%pstate"
1051                              : /* No outputs */
1052                              : "i" (PSTATE_IE)
1053                              : "g1");
1054
1055         irq_desc[0].action = &timer_irq_action;
1056 }