arch/sparc/kernel/irq_64.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* irq.c: UltraSparc IRQ handling/init/registry.
   3  *
   4  * Copyright (C) 1997, 2007, 2008 David S. Miller ([email protected])
   5  * Copyright (C) 1998  Eddie C. Dost    ([email protected])
   6  * Copyright (C) 1998  Jakub Jelinek    ([email protected])
   7  */
   8
   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/ftrace.h>
  24 #include <linux/irq.h>
  25
  26 #include <asm/ptrace.h>
  27 #include <asm/processor.h>
  28 #include <linux/atomic.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 <linux/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 #include "cpumap.h"
  48 #include "kstack.h"
  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_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                                              __irq)),
  90                                "i" (ASI_PHYS_USE_EC));
  91
  92         return ret;
  93 }
  94
  95 static void bucket_set_irq(unsigned long bucket_pa, unsigned int irq)
  96 {
  97         __asm__ __volatile__("stwa      %0, [%1] %2"
  98                              : /* no outputs */
  99                              : "r" (irq),
 100                                "r" (bucket_pa +
 101                                     offsetof(struct ino_bucket,
 102                                              __irq)),
 103                                "i" (ASI_PHYS_USE_EC));
 104 }
 105
 106 #define irq_work_pa(__cpu)      &(trap_block[(__cpu)].irq_worklist_pa)
 107
 108 static unsigned long hvirq_major __initdata;
 109 static int __init early_hvirq_major(char *p)
 110 {
 111         int rc = kstrtoul(p, 10, &hvirq_major);
 112
 113         return rc;
 114 }
 115 early_param("hvirq", early_hvirq_major);
 116
 117 static int hv_irq_version;
 118
 119 /* Major version 2.0 of HV_GRP_INTR added support for the VIRQ cookie
 120  * based interfaces, but:
 121  *
 122  * 1) Several OSs, Solaris and Linux included, use them even when only
 123  *    negotiating version 1.0 (or failing to negotiate at all).  So the
 124  *    hypervisor has a workaround that provides the VIRQ interfaces even
 125  *    when only verion 1.0 of the API is in use.
 126  *
 127  * 2) Second, and more importantly, with major version 2.0 these VIRQ
 128  *    interfaces only were actually hooked up for LDC interrupts, even
 129  *    though the Hypervisor specification clearly stated:
 130  *
 131  *      The new interrupt API functions will be available to a guest
 132  *      when it negotiates version 2.0 in the interrupt API group 0x2. When
 133  *      a guest negotiates version 2.0, all interrupt sources will only
 134  *      support using the cookie interface, and any attempt to use the
 135  *      version 1.0 interrupt APIs numbered 0xa0 to 0xa6 will result in the
 136  *      ENOTSUPPORTED error being returned.
 137  *
 138  *   with an emphasis on "all interrupt sources".
 139  *
 140  * To correct this, major version 3.0 was created which does actually
 141  * support VIRQs for all interrupt sources (not just LDC devices).  So
 142  * if we want to move completely over the cookie based VIRQs we must
 143  * negotiate major version 3.0 or later of HV_GRP_INTR.
 144  */
 145 static bool sun4v_cookie_only_virqs(void)
 146 {
 147         if (hv_irq_version >= 3)
 148                 return true;
 149         return false;
 150 }
 151
 152 static void __init irq_init_hv(void)
 153 {
 154         unsigned long hv_error, major, minor = 0;
 155
 156         if (tlb_type != hypervisor)
 157                 return;
 158
 159         if (hvirq_major)
 160                 major = hvirq_major;
 161         else
 162                 major = 3;
 163
 164         hv_error = sun4v_hvapi_register(HV_GRP_INTR, major, &minor);
 165         if (!hv_error)
 166                 hv_irq_version = major;
 167         else
 168                 hv_irq_version = 1;
 169
 170         pr_info("SUN4V: Using IRQ API major %d, cookie only virqs %s\n",
 171                 hv_irq_version,
 172                 sun4v_cookie_only_virqs() ? "enabled" : "disabled");
 173 }
 174
 175 /* This function is for the timer interrupt.*/
 176 int __init arch_probe_nr_irqs(void)
 177 {
 178         return 1;
 179 }
 180
 181 #define DEFAULT_NUM_IVECS       (0xfffU)
 182 static unsigned int nr_ivec = DEFAULT_NUM_IVECS;
 183 #define NUM_IVECS (nr_ivec)
 184
 185 static unsigned int __init size_nr_ivec(void)
 186 {
 187         if (tlb_type == hypervisor) {
 188                 switch (sun4v_chip_type) {
 189                 /* Athena's devhandle|devino is large.*/
 190                 case SUN4V_CHIP_SPARC64X:
 191                         nr_ivec = 0xffff;
 192                         break;
 193                 }
 194         }
 195         return nr_ivec;
 196 }
 197
 198 struct irq_handler_data {
 199         union {
 200                 struct {
 201                         unsigned int dev_handle;
 202                         unsigned int dev_ino;
 203                 };
 204                 unsigned long sysino;
 205         };
 206         struct ino_bucket bucket;
 207         unsigned long   iclr;
 208         unsigned long   imap;
 209 };
 210
 211 static inline unsigned int irq_data_to_handle(struct irq_data *data)
 212 {
 213         struct irq_handler_data *ihd = irq_data_get_irq_handler_data(data);
 214
 215         return ihd->dev_handle;
 216 }
 217
 218 static inline unsigned int irq_data_to_ino(struct irq_data *data)
 219 {
 220         struct irq_handler_data *ihd = irq_data_get_irq_handler_data(data);
 221
 222         return ihd->dev_ino;
 223 }
 224
 225 static inline unsigned long irq_data_to_sysino(struct irq_data *data)
 226 {
 227         struct irq_handler_data *ihd = irq_data_get_irq_handler_data(data);
 228
 229         return ihd->sysino;
 230 }
 231
 232 void irq_free(unsigned int irq)
 233 {
 234         void *data = irq_get_handler_data(irq);
 235
 236         kfree(data);
 237         irq_set_handler_data(irq, NULL);
 238         irq_free_descs(irq, 1);
 239 }
 240
 241 unsigned int irq_alloc(unsigned int dev_handle, unsigned int dev_ino)
 242 {
 243         int irq;
 244
 245         irq = __irq_alloc_descs(-1, 1, 1, numa_node_id(), NULL, NULL);
 246         if (irq <= 0)
 247                 goto out;
 248
 249         return irq;
 250 out:
 251         return 0;
 252 }
 253
 254 static unsigned int cookie_exists(u32 devhandle, unsigned int devino)
 255 {
 256         unsigned long hv_err, cookie;
 257         struct ino_bucket *bucket;
 258         unsigned int irq = 0U;
 259
 260         hv_err = sun4v_vintr_get_cookie(devhandle, devino, &cookie);
 261         if (hv_err) {
 262                 pr_err("HV get cookie failed hv_err = %ld\n", hv_err);
 263                 goto out;
 264         }
 265
 266         if (cookie & ((1UL << 63UL))) {
 267                 cookie = ~cookie;
 268                 bucket = (struct ino_bucket *) __va(cookie);
 269                 irq = bucket->__irq;
 270         }
 271 out:
 272         return irq;
 273 }
 274
 275 static unsigned int sysino_exists(u32 devhandle, unsigned int devino)
 276 {
 277         unsigned long sysino = sun4v_devino_to_sysino(devhandle, devino);
 278         struct ino_bucket *bucket;
 279         unsigned int irq;
 280
 281         bucket = &ivector_table[sysino];
 282         irq = bucket_get_irq(__pa(bucket));
 283
 284         return irq;
 285 }
 286
 287 void ack_bad_irq(unsigned int irq)
 288 {
 289         pr_crit("BAD IRQ ack %d\n", irq);
 290 }
 291
 292 void irq_install_pre_handler(int irq,
 293                              void (*func)(unsigned int, void *, void *),
 294                              void *arg1, void *arg2)
 295 {
 296         pr_warn("IRQ pre handler NOT supported.\n");
 297 }
 298
 299 /*
 300  * /proc/interrupts printing:
 301  */
 302 int arch_show_interrupts(struct seq_file *p, int prec)
 303 {
 304         int j;
 305
 306         seq_printf(p, "NMI: ");
 307         for_each_online_cpu(j)
 308                 seq_printf(p, "%10u ", cpu_data(j).__nmi_count);
 309         seq_printf(p, "     Non-maskable interrupts\n");
 310         return 0;
 311 }
 312
 313 static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid)
 314 {
 315         unsigned int tid;
 316
 317         if (this_is_starfire) {
 318                 tid = starfire_translate(imap, cpuid);
 319                 tid <<= IMAP_TID_SHIFT;
 320                 tid &= IMAP_TID_UPA;
 321         } else {
 322                 if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 323                         unsigned long ver;
 324
 325                         __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 326                         if ((ver >> 32UL) == __JALAPENO_ID ||
 327                             (ver >> 32UL) == __SERRANO_ID) {
 328                                 tid = cpuid << IMAP_TID_SHIFT;
 329                                 tid &= IMAP_TID_JBUS;
 330                         } else {
 331                                 unsigned int a = cpuid & 0x1f;
 332                                 unsigned int n = (cpuid >> 5) & 0x1f;
 333
 334                                 tid = ((a << IMAP_AID_SHIFT) |
 335                                        (n << IMAP_NID_SHIFT));
 336                                 tid &= (IMAP_AID_SAFARI |
 337                                         IMAP_NID_SAFARI);
 338                         }
 339                 } else {
 340                         tid = cpuid << IMAP_TID_SHIFT;
 341                         tid &= IMAP_TID_UPA;
 342                 }
 343         }
 344
 345         return tid;
 346 }
 347
 348 #ifdef CONFIG_SMP
 349 static int irq_choose_cpu(unsigned int irq, const struct cpumask *affinity)
 350 {
 351         cpumask_t mask;
 352         int cpuid;
 353
 354         cpumask_copy(&mask, affinity);
 355         if (cpumask_equal(&mask, cpu_online_mask)) {
 356                 cpuid = map_to_cpu(irq);
 357         } else {
 358                 cpumask_t tmp;
 359
 360                 cpumask_and(&tmp, cpu_online_mask, &mask);
 361                 cpuid = cpumask_empty(&tmp) ? map_to_cpu(irq) : cpumask_first(&tmp);
 362         }
 363
 364         return cpuid;
 365 }
 366 #else
 367 #define irq_choose_cpu(irq, affinity)   \
 368         real_hard_smp_processor_id()
 369 #endif
 370
 371 static void sun4u_irq_enable(struct irq_data *data)
 372 {
 373         struct irq_handler_data *handler_data;
 374
 375         handler_data = irq_data_get_irq_handler_data(data);
 376         if (likely(handler_data)) {
 377                 unsigned long cpuid, imap, val;
 378                 unsigned int tid;
 379
 380                 cpuid = irq_choose_cpu(data->irq,
 381                                        irq_data_get_affinity_mask(data));
 382                 imap = handler_data->imap;
 383
 384                 tid = sun4u_compute_tid(imap, cpuid);
 385
 386                 val = upa_readq(imap);
 387                 val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS |
 388                          IMAP_AID_SAFARI | IMAP_NID_SAFARI);
 389                 val |= tid | IMAP_VALID;
 390                 upa_writeq(val, imap);
 391                 upa_writeq(ICLR_IDLE, handler_data->iclr);
 392         }
 393 }
 394
 395 static int sun4u_set_affinity(struct irq_data *data,
 396                                const struct cpumask *mask, bool force)
 397 {
 398         struct irq_handler_data *handler_data;
 399
 400         handler_data = irq_data_get_irq_handler_data(data);
 401         if (likely(handler_data)) {
 402                 unsigned long cpuid, imap, val;
 403                 unsigned int tid;
 404
 405                 cpuid = irq_choose_cpu(data->irq, mask);
 406                 imap = handler_data->imap;
 407
 408                 tid = sun4u_compute_tid(imap, cpuid);
 409
 410                 val = upa_readq(imap);
 411                 val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS |
 412                          IMAP_AID_SAFARI | IMAP_NID_SAFARI);
 413                 val |= tid | IMAP_VALID;
 414                 upa_writeq(val, imap);
 415                 upa_writeq(ICLR_IDLE, handler_data->iclr);
 416         }
 417
 418         return 0;
 419 }
 420
 421 /* Don't do anything.  The desc->status check for IRQ_DISABLED in
 422  * handler_irq() will skip the handler call and that will leave the
 423  * interrupt in the sent state.  The next ->enable() call will hit the
 424  * ICLR register to reset the state machine.
 425  *
 426  * This scheme is necessary, instead of clearing the Valid bit in the
 427  * IMAP register, to handle the case of IMAP registers being shared by
 428  * multiple INOs (and thus ICLR registers).  Since we use a different
 429  * virtual IRQ for each shared IMAP instance, the generic code thinks
 430  * there is only one user so it prematurely calls ->disable() on
 431  * free_irq().
 432  *
 433  * We have to provide an explicit ->disable() method instead of using
 434  * NULL to get the default.  The reason is that if the generic code
 435  * sees that, it also hooks up a default ->shutdown method which
 436  * invokes ->mask() which we do not want.  See irq_chip_set_defaults().
 437  */
 438 static void sun4u_irq_disable(struct irq_data *data)
 439 {
 440 }
 441
 442 static void sun4u_irq_eoi(struct irq_data *data)
 443 {
 444         struct irq_handler_data *handler_data;
 445
 446         handler_data = irq_data_get_irq_handler_data(data);
 447         if (likely(handler_data))
 448                 upa_writeq(ICLR_IDLE, handler_data->iclr);
 449 }
 450
 451 static void sun4v_irq_enable(struct irq_data *data)
 452 {
 453         unsigned long cpuid = irq_choose_cpu(data->irq,
 454                                              irq_data_get_affinity_mask(data));
 455         unsigned int ino = irq_data_to_sysino(data);
 456         int err;
 457
 458         err = sun4v_intr_settarget(ino, cpuid);
 459         if (err != HV_EOK)
 460                 printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
 461                        "err(%d)\n", ino, cpuid, err);
 462         err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 463         if (err != HV_EOK)
 464                 printk(KERN_ERR "sun4v_intr_setstate(%x): "
 465                        "err(%d)\n", ino, err);
 466         err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED);
 467         if (err != HV_EOK)
 468                 printk(KERN_ERR "sun4v_intr_setenabled(%x): err(%d)\n",
 469                        ino, err);
 470 }
 471
 472 static int sun4v_set_affinity(struct irq_data *data,
 473                                const struct cpumask *mask, bool force)
 474 {
 475         unsigned long cpuid = irq_choose_cpu(data->irq, mask);
 476         unsigned int ino = irq_data_to_sysino(data);
 477         int err;
 478
 479         err = sun4v_intr_settarget(ino, cpuid);
 480         if (err != HV_EOK)
 481                 printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
 482                        "err(%d)\n", ino, cpuid, err);
 483
 484         return 0;
 485 }
 486
 487 static void sun4v_irq_disable(struct irq_data *data)
 488 {
 489         unsigned int ino = irq_data_to_sysino(data);
 490         int err;
 491
 492         err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED);
 493         if (err != HV_EOK)
 494                 printk(KERN_ERR "sun4v_intr_setenabled(%x): "
 495                        "err(%d)\n", ino, err);
 496 }
 497
 498 static void sun4v_irq_eoi(struct irq_data *data)
 499 {
 500         unsigned int ino = irq_data_to_sysino(data);
 501         int err;
 502
 503         err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 504         if (err != HV_EOK)
 505                 printk(KERN_ERR "sun4v_intr_setstate(%x): "
 506                        "err(%d)\n", ino, err);
 507 }
 508
 509 static void sun4v_virq_enable(struct irq_data *data)
 510 {
 511         unsigned long dev_handle = irq_data_to_handle(data);
 512         unsigned long dev_ino = irq_data_to_ino(data);
 513         unsigned long cpuid;
 514         int err;
 515
 516         cpuid = irq_choose_cpu(data->irq, irq_data_get_affinity_mask(data));
 517
 518         err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
 519         if (err != HV_EOK)
 520                 printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
 521                        "err(%d)\n",
 522                        dev_handle, dev_ino, cpuid, err);
 523         err = sun4v_vintr_set_state(dev_handle, dev_ino,
 524                                     HV_INTR_STATE_IDLE);
 525         if (err != HV_EOK)
 526                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 527                        "HV_INTR_STATE_IDLE): err(%d)\n",
 528                        dev_handle, dev_ino, err);
 529         err = sun4v_vintr_set_valid(dev_handle, dev_ino,
 530                                     HV_INTR_ENABLED);
 531         if (err != HV_EOK)
 532                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 533                        "HV_INTR_ENABLED): err(%d)\n",
 534                        dev_handle, dev_ino, err);
 535 }
 536
 537 static int sun4v_virt_set_affinity(struct irq_data *data,
 538                                     const struct cpumask *mask, bool force)
 539 {
 540         unsigned long dev_handle = irq_data_to_handle(data);
 541         unsigned long dev_ino = irq_data_to_ino(data);
 542         unsigned long cpuid;
 543         int err;
 544
 545         cpuid = irq_choose_cpu(data->irq, mask);
 546
 547         err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
 548         if (err != HV_EOK)
 549                 printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
 550                        "err(%d)\n",
 551                        dev_handle, dev_ino, cpuid, err);
 552
 553         return 0;
 554 }
 555
 556 static void sun4v_virq_disable(struct irq_data *data)
 557 {
 558         unsigned long dev_handle = irq_data_to_handle(data);
 559         unsigned long dev_ino = irq_data_to_ino(data);
 560         int err;
 561
 562
 563         err = sun4v_vintr_set_valid(dev_handle, dev_ino,
 564                                     HV_INTR_DISABLED);
 565         if (err != HV_EOK)
 566                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 567                        "HV_INTR_DISABLED): err(%d)\n",
 568                        dev_handle, dev_ino, err);
 569 }
 570
 571 static void sun4v_virq_eoi(struct irq_data *data)
 572 {
 573         unsigned long dev_handle = irq_data_to_handle(data);
 574         unsigned long dev_ino = irq_data_to_ino(data);
 575         int err;
 576
 577         err = sun4v_vintr_set_state(dev_handle, dev_ino,
 578                                     HV_INTR_STATE_IDLE);
 579         if (err != HV_EOK)
 580                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
 581                        "HV_INTR_STATE_IDLE): err(%d)\n",
 582                        dev_handle, dev_ino, err);
 583 }
 584
 585 static struct irq_chip sun4u_irq = {
 586         .name                   = "sun4u",
 587         .irq_enable             = sun4u_irq_enable,
 588         .irq_disable            = sun4u_irq_disable,
 589         .irq_eoi                = sun4u_irq_eoi,
 590         .irq_set_affinity       = sun4u_set_affinity,
 591         .flags                  = IRQCHIP_EOI_IF_HANDLED,
 592 };
 593
 594 static struct irq_chip sun4v_irq = {
 595         .name                   = "sun4v",
 596         .irq_enable             = sun4v_irq_enable,
 597         .irq_disable            = sun4v_irq_disable,
 598         .irq_eoi                = sun4v_irq_eoi,
 599         .irq_set_affinity       = sun4v_set_affinity,
 600         .flags                  = IRQCHIP_EOI_IF_HANDLED,
 601 };
 602
 603 static struct irq_chip sun4v_virq = {
 604         .name                   = "vsun4v",
 605         .irq_enable             = sun4v_virq_enable,
 606         .irq_disable            = sun4v_virq_disable,
 607         .irq_eoi                = sun4v_virq_eoi,
 608         .irq_set_affinity       = sun4v_virt_set_affinity,
 609         .flags                  = IRQCHIP_EOI_IF_HANDLED,
 610 };
 611
 612 unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
 613 {
 614         struct irq_handler_data *handler_data;
 615         struct ino_bucket *bucket;
 616         unsigned int irq;
 617         int ino;
 618
 619         BUG_ON(tlb_type == hypervisor);
 620
 621         ino = (upa_readq(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
 622         bucket = &ivector_table[ino];
 623         irq = bucket_get_irq(__pa(bucket));
 624         if (!irq) {
 625                 irq = irq_alloc(0, ino);
 626                 bucket_set_irq(__pa(bucket), irq);
 627                 irq_set_chip_and_handler_name(irq, &sun4u_irq,
 628                                               handle_fasteoi_irq, "IVEC");
 629         }
 630
 631         handler_data = irq_get_handler_data(irq);
 632         if (unlikely(handler_data))
 633                 goto out;
 634
 635         handler_data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 636         if (unlikely(!handler_data)) {
 637                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 638                 prom_halt();
 639         }
 640         irq_set_handler_data(irq, handler_data);
 641
 642         handler_data->imap  = imap;
 643         handler_data->iclr  = iclr;
 644
 645 out:
 646         return irq;
 647 }
 648
 649 static unsigned int sun4v_build_common(u32 devhandle, unsigned int devino,
 650                 void (*handler_data_init)(struct irq_handler_data *data,
 651                 u32 devhandle, unsigned int devino),
 652                 struct irq_chip *chip)
 653 {
 654         struct irq_handler_data *data;
 655         unsigned int irq;
 656
 657         irq = irq_alloc(devhandle, devino);
 658         if (!irq)
 659                 goto out;
 660
 661         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 662         if (unlikely(!data)) {
 663                 pr_err("IRQ handler data allocation failed.\n");
 664                 irq_free(irq);
 665                 irq = 0;
 666                 goto out;
 667         }
 668
 669         irq_set_handler_data(irq, data);
 670         handler_data_init(data, devhandle, devino);
 671         irq_set_chip_and_handler_name(irq, chip, handle_fasteoi_irq, "IVEC");
 672         data->imap = ~0UL;
 673         data->iclr = ~0UL;
 674 out:
 675         return irq;
 676 }
 677
 678 static unsigned long cookie_assign(unsigned int irq, u32 devhandle,
 679                 unsigned int devino)
 680 {
 681         struct irq_handler_data *ihd = irq_get_handler_data(irq);
 682         unsigned long hv_error, cookie;
 683
 684         /* handler_irq needs to find the irq. cookie is seen signed in
 685          * sun4v_dev_mondo and treated as a non ivector_table delivery.
 686          */
 687         ihd->bucket.__irq = irq;
 688         cookie = ~__pa(&ihd->bucket);
 689
 690         hv_error = sun4v_vintr_set_cookie(devhandle, devino, cookie);
 691         if (hv_error)
 692                 pr_err("HV vintr set cookie failed = %ld\n", hv_error);
 693
 694         return hv_error;
 695 }
 696
 697 static void cookie_handler_data(struct irq_handler_data *data,
 698                                 u32 devhandle, unsigned int devino)
 699 {
 700         data->dev_handle = devhandle;
 701         data->dev_ino = devino;
 702 }
 703
 704 static unsigned int cookie_build_irq(u32 devhandle, unsigned int devino,
 705                                      struct irq_chip *chip)
 706 {
 707         unsigned long hv_error;
 708         unsigned int irq;
 709
 710         irq = sun4v_build_common(devhandle, devino, cookie_handler_data, chip);
 711
 712         hv_error = cookie_assign(irq, devhandle, devino);
 713         if (hv_error) {
 714                 irq_free(irq);
 715                 irq = 0;
 716         }
 717
 718         return irq;
 719 }
 720
 721 static unsigned int sun4v_build_cookie(u32 devhandle, unsigned int devino)
 722 {
 723         unsigned int irq;
 724
 725         irq = cookie_exists(devhandle, devino);
 726         if (irq)
 727                 goto out;
 728
 729         irq = cookie_build_irq(devhandle, devino, &sun4v_virq);
 730
 731 out:
 732         return irq;
 733 }
 734
 735 static void sysino_set_bucket(unsigned int irq)
 736 {
 737         struct irq_handler_data *ihd = irq_get_handler_data(irq);
 738         struct ino_bucket *bucket;
 739         unsigned long sysino;
 740
 741         sysino = sun4v_devino_to_sysino(ihd->dev_handle, ihd->dev_ino);
 742         BUG_ON(sysino >= nr_ivec);
 743         bucket = &ivector_table[sysino];
 744         bucket_set_irq(__pa(bucket), irq);
 745 }
 746
 747 static void sysino_handler_data(struct irq_handler_data *data,
 748                                 u32 devhandle, unsigned int devino)
 749 {
 750         unsigned long sysino;
 751
 752         sysino = sun4v_devino_to_sysino(devhandle, devino);
 753         data->sysino = sysino;
 754 }
 755
 756 static unsigned int sysino_build_irq(u32 devhandle, unsigned int devino,
 757                                      struct irq_chip *chip)
 758 {
 759         unsigned int irq;
 760
 761         irq = sun4v_build_common(devhandle, devino, sysino_handler_data, chip);
 762         if (!irq)
 763                 goto out;
 764
 765         sysino_set_bucket(irq);
 766 out:
 767         return irq;
 768 }
 769
 770 static int sun4v_build_sysino(u32 devhandle, unsigned int devino)
 771 {
 772         int irq;
 773
 774         irq = sysino_exists(devhandle, devino);
 775         if (irq)
 776                 goto out;
 777
 778         irq = sysino_build_irq(devhandle, devino, &sun4v_irq);
 779 out:
 780         return irq;
 781 }
 782
 783 unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino)
 784 {
 785         unsigned int irq;
 786
 787         if (sun4v_cookie_only_virqs())
 788                 irq = sun4v_build_cookie(devhandle, devino);
 789         else
 790                 irq = sun4v_build_sysino(devhandle, devino);
 791
 792         return irq;
 793 }
 794
 795 unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino)
 796 {
 797         int irq;
 798
 799         irq = cookie_build_irq(devhandle, devino, &sun4v_virq);
 800         if (!irq)
 801                 goto out;
 802
 803         /* This is borrowed from the original function.
 804          */
 805         irq_set_status_flags(irq, IRQ_NOAUTOEN);
 806
 807 out:
 808         return irq;
 809 }
 810
 811 void *hardirq_stack[NR_CPUS];
 812 void *softirq_stack[NR_CPUS];
 813
 814 void __irq_entry handler_irq(int pil, struct pt_regs *regs)
 815 {
 816         unsigned long pstate, bucket_pa;
 817         struct pt_regs *old_regs;
 818         void *orig_sp;
 819
 820         clear_softint(1 << pil);
 821
 822         old_regs = set_irq_regs(regs);
 823         irq_enter();
 824
 825         /* Grab an atomic snapshot of the pending IVECs.  */
 826         __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
 827                              "wrpr      %0, %3, %%pstate\n\t"
 828                              "ldx       [%2], %1\n\t"
 829                              "stx       %%g0, [%2]\n\t"
 830                              "wrpr      %0, 0x0, %%pstate\n\t"
 831                              : "=&r" (pstate), "=&r" (bucket_pa)
 832                              : "r" (irq_work_pa(smp_processor_id())),
 833                                "i" (PSTATE_IE)
 834                              : "memory");
 835
 836         orig_sp = set_hardirq_stack();
 837
 838         while (bucket_pa) {
 839                 unsigned long next_pa;
 840                 unsigned int irq;
 841
 842                 next_pa = bucket_get_chain_pa(bucket_pa);
 843                 irq = bucket_get_irq(bucket_pa);
 844                 bucket_clear_chain_pa(bucket_pa);
 845
 846                 generic_handle_irq(irq);
 847
 848                 bucket_pa = next_pa;
 849         }
 850
 851         restore_hardirq_stack(orig_sp);
 852
 853         irq_exit();
 854         set_irq_regs(old_regs);
 855 }
 856
 857 void do_softirq_own_stack(void)
 858 {
 859         void *orig_sp, *sp = softirq_stack[smp_processor_id()];
 860
 861         sp += THREAD_SIZE - 192 - STACK_BIAS;
 862
 863         __asm__ __volatile__("mov %%sp, %0\n\t"
 864                              "mov %1, %%sp"
 865                              : "=&r" (orig_sp)
 866                              : "r" (sp));
 867         __do_softirq();
 868         __asm__ __volatile__("mov %0, %%sp"
 869                              : : "r" (orig_sp));
 870 }
 871
 872 #ifdef CONFIG_HOTPLUG_CPU
 873 void fixup_irqs(void)
 874 {
 875         unsigned int irq;
 876
 877         for (irq = 0; irq < NR_IRQS; irq++) {
 878                 struct irq_desc *desc = irq_to_desc(irq);
 879                 struct irq_data *data;
 880                 unsigned long flags;
 881
 882                 if (!desc)
 883                         continue;
 884                 data = irq_desc_get_irq_data(desc);
 885                 raw_spin_lock_irqsave(&desc->lock, flags);
 886                 if (desc->action && !irqd_is_per_cpu(data)) {
 887                         if (data->chip->irq_set_affinity)
 888                                 data->chip->irq_set_affinity(data,
 889                                         irq_data_get_affinity_mask(data),
 890                                         false);
 891                 }
 892                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 893         }
 894
 895         tick_ops->disable_irq();
 896 }
 897 #endif
 898
 899 struct sun5_timer {
 900         u64     count0;
 901         u64     limit0;
 902         u64     count1;
 903         u64     limit1;
 904 };
 905
 906 static struct sun5_timer *prom_timers;
 907 static u64 prom_limit0, prom_limit1;
 908
 909 static void map_prom_timers(void)
 910 {
 911         struct device_node *dp;
 912         const unsigned int *addr;
 913
 914         /* PROM timer node hangs out in the top level of device siblings... */
 915         dp = of_find_node_by_path("/");
 916         dp = dp->child;
 917         while (dp) {
 918                 if (of_node_name_eq(dp, "counter-timer"))
 919                         break;
 920                 dp = dp->sibling;
 921         }
 922
 923         /* Assume if node is not present, PROM uses different tick mechanism
 924          * which we should not care about.
 925          */
 926         if (!dp) {
 927                 prom_timers = (struct sun5_timer *) 0;
 928                 return;
 929         }
 930
 931         /* If PROM is really using this, it must be mapped by him. */
 932         addr = of_get_property(dp, "address", NULL);
 933         if (!addr) {
 934                 prom_printf("PROM does not have timer mapped, trying to continue.\n");
 935                 prom_timers = (struct sun5_timer *) 0;
 936                 return;
 937         }
 938         prom_timers = (struct sun5_timer *) ((unsigned long)addr[0]);
 939 }
 940
 941 static void kill_prom_timer(void)
 942 {
 943         if (!prom_timers)
 944                 return;
 945
 946         /* Save them away for later. */
 947         prom_limit0 = prom_timers->limit0;
 948         prom_limit1 = prom_timers->limit1;
 949
 950         /* Just as in sun4c PROM uses timer which ticks at IRQ 14.
 951          * We turn both off here just to be paranoid.
 952          */
 953         prom_timers->limit0 = 0;
 954         prom_timers->limit1 = 0;
 955
 956         /* Wheee, eat the interrupt packet too... */
 957         __asm__ __volatile__(
 958 "       mov     0x40, %%g2\n"
 959 "       ldxa    [%%g0] %0, %%g1\n"
 960 "       ldxa    [%%g2] %1, %%g1\n"
 961 "       stxa    %%g0, [%%g0] %0\n"
 962 "       membar  #Sync\n"
 963         : /* no outputs */
 964         : "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R)
 965         : "g1", "g2");
 966 }
 967
 968 void notrace init_irqwork_curcpu(void)
 969 {
 970         int cpu = hard_smp_processor_id();
 971
 972         trap_block[cpu].irq_worklist_pa = 0UL;
 973 }
 974
 975 /* Please be very careful with register_one_mondo() and
 976  * sun4v_register_mondo_queues().
 977  *
 978  * On SMP this gets invoked from the CPU trampoline before
 979  * the cpu has fully taken over the trap table from OBP,
 980  * and it's kernel stack + %g6 thread register state is
 981  * not fully cooked yet.
 982  *
 983  * Therefore you cannot make any OBP calls, not even prom_printf,
 984  * from these two routines.
 985  */
 986 static void notrace register_one_mondo(unsigned long paddr, unsigned long type,
 987                                        unsigned long qmask)
 988 {
 989         unsigned long num_entries = (qmask + 1) / 64;
 990         unsigned long status;
 991
 992         status = sun4v_cpu_qconf(type, paddr, num_entries);
 993         if (status != HV_EOK) {
 994                 prom_printf("SUN4V: sun4v_cpu_qconf(%lu:%lx:%lu) failed, "
 995                             "err %lu\n", type, paddr, num_entries, status);
 996                 prom_halt();
 997         }
 998 }
 999
1000 void notrace sun4v_register_mondo_queues(int this_cpu)
1001 {
1002         struct trap_per_cpu *tb = &trap_block[this_cpu];
1003
1004         register_one_mondo(tb->cpu_mondo_pa, HV_CPU_QUEUE_CPU_MONDO,
1005                            tb->cpu_mondo_qmask);
1006         register_one_mondo(tb->dev_mondo_pa, HV_CPU_QUEUE_DEVICE_MONDO,
1007                            tb->dev_mondo_qmask);
1008         register_one_mondo(tb->resum_mondo_pa, HV_CPU_QUEUE_RES_ERROR,
1009                            tb->resum_qmask);
1010         register_one_mondo(tb->nonresum_mondo_pa, HV_CPU_QUEUE_NONRES_ERROR,
1011                            tb->nonresum_qmask);
1012 }
1013
1014 /* Each queue region must be a power of 2 multiple of 64 bytes in
1015  * size.  The base real address must be aligned to the size of the
1016  * region.  Thus, an 8KB queue must be 8KB aligned, for example.
1017  */
1018 static void __init alloc_one_queue(unsigned long *pa_ptr, unsigned long qmask)
1019 {
1020         unsigned long size = PAGE_ALIGN(qmask + 1);
1021         unsigned long order = get_order(size);
1022         unsigned long p;
1023
1024         p = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
1025         if (!p) {
1026                 prom_printf("SUN4V: Error, cannot allocate queue.\n");
1027                 prom_halt();
1028         }
1029
1030         *pa_ptr = __pa(p);
1031 }
1032
1033 static void __init init_cpu_send_mondo_info(struct trap_per_cpu *tb)
1034 {
1035 #ifdef CONFIG_SMP
1036         unsigned long page;
1037         void *mondo, *p;
1038
1039         BUILD_BUG_ON((NR_CPUS * sizeof(u16)) > PAGE_SIZE);
1040
1041         /* Make sure mondo block is 64byte aligned */
1042         p = kzalloc(127, GFP_KERNEL);
1043         if (!p) {
1044                 prom_printf("SUN4V: Error, cannot allocate mondo block.\n");
1045                 prom_halt();
1046         }
1047         mondo = (void *)(((unsigned long)p + 63) & ~0x3f);
1048         tb->cpu_mondo_block_pa = __pa(mondo);
1049
1050         page = get_zeroed_page(GFP_KERNEL);
1051         if (!page) {
1052                 prom_printf("SUN4V: Error, cannot allocate cpu list page.\n");
1053                 prom_halt();
1054         }
1055
1056         tb->cpu_list_pa = __pa(page);
1057 #endif
1058 }
1059
1060 /* Allocate mondo and error queues for all possible cpus.  */
1061 static void __init sun4v_init_mondo_queues(void)
1062 {
1063         int cpu;
1064
1065         for_each_possible_cpu(cpu) {
1066                 struct trap_per_cpu *tb = &trap_block[cpu];
1067
1068                 alloc_one_queue(&tb->cpu_mondo_pa, tb->cpu_mondo_qmask);
1069                 alloc_one_queue(&tb->dev_mondo_pa, tb->dev_mondo_qmask);
1070                 alloc_one_queue(&tb->resum_mondo_pa, tb->resum_qmask);
1071                 alloc_one_queue(&tb->resum_kernel_buf_pa, tb->resum_qmask);
1072                 alloc_one_queue(&tb->nonresum_mondo_pa, tb->nonresum_qmask);
1073                 alloc_one_queue(&tb->nonresum_kernel_buf_pa,
1074                                 tb->nonresum_qmask);
1075         }
1076 }
1077
1078 static void __init init_send_mondo_info(void)
1079 {
1080         int cpu;
1081
1082         for_each_possible_cpu(cpu) {
1083                 struct trap_per_cpu *tb = &trap_block[cpu];
1084
1085                 init_cpu_send_mondo_info(tb);
1086         }
1087 }
1088
1089 static struct irqaction timer_irq_action = {
1090         .name = "timer",
1091 };
1092
1093 static void __init irq_ivector_init(void)
1094 {
1095         unsigned long size, order;
1096         unsigned int ivecs;
1097
1098         /* If we are doing cookie only VIRQs then we do not need the ivector
1099          * table to process interrupts.
1100          */
1101         if (sun4v_cookie_only_virqs())
1102                 return;
1103
1104         ivecs = size_nr_ivec();
1105         size = sizeof(struct ino_bucket) * ivecs;
1106         order = get_order(size);
1107         ivector_table = (struct ino_bucket *)
1108                 __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
1109         if (!ivector_table) {
1110                 prom_printf("Fatal error, cannot allocate ivector_table\n");
1111                 prom_halt();
1112         }
1113         __flush_dcache_range((unsigned long) ivector_table,
1114                              ((unsigned long) ivector_table) + size);
1115
1116         ivector_table_pa = __pa(ivector_table);
1117 }
1118
1119 /* Only invoked on boot processor.*/
1120 void __init init_IRQ(void)
1121 {
1122         irq_init_hv();
1123         irq_ivector_init();
1124         map_prom_timers();
1125         kill_prom_timer();
1126
1127         if (tlb_type == hypervisor)
1128                 sun4v_init_mondo_queues();
1129
1130         init_send_mondo_info();
1131
1132         if (tlb_type == hypervisor) {
1133                 /* Load up the boot cpu's entries.  */
1134                 sun4v_register_mondo_queues(hard_smp_processor_id());
1135         }
1136
1137         /* We need to clear any IRQ's pending in the soft interrupt
1138          * registers, a spurious one could be left around from the
1139          * PROM timer which we just disabled.
1140          */
1141         clear_softint(get_softint());
1142
1143         /* Now that ivector table is initialized, it is safe
1144          * to receive IRQ vector traps.  We will normally take
1145          * one or two right now, in case some device PROM used
1146          * to boot us wants to speak to us.  We just ignore them.
1147          */
1148         __asm__ __volatile__("rdpr      %%pstate, %%g1\n\t"
1149                              "or        %%g1, %0, %%g1\n\t"
1150                              "wrpr      %%g1, 0x0, %%pstate"
1151                              : /* No outputs */
1152                              : "i" (PSTATE_IE)
1153                              : "g1");
1154
1155         irq_to_desc(0)->action = &timer_irq_action;
1156 }