arch/powerpc/platforms/cell/spu_base.c

   1 /*
   2  * Low-level SPU handling
   3  *
   4  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
   5  *
   6  * Author: Arnd Bergmann <arndb@de.ibm.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #undef DEBUG
  24
  25 #include <linux/interrupt.h>
  26 #include <linux/list.h>
  27 #include <linux/module.h>
  28 #include <linux/poll.h>
  29 #include <linux/ptrace.h>
  30 #include <linux/slab.h>
  31 #include <linux/wait.h>
  32
  33 #include <asm/io.h>
  34 #include <asm/prom.h>
  35 #include <linux/mutex.h>
  36 #include <asm/spu.h>
  37 #include <asm/spu_priv1.h>
  38 #include <asm/mmu_context.h>
  39
  40 #include "interrupt.h"
  41
  42 const struct spu_priv1_ops *spu_priv1_ops;
  43
  44 EXPORT_SYMBOL_GPL(spu_priv1_ops);
  45
  46 static int __spu_trap_invalid_dma(struct spu *spu)
  47 {
  48         pr_debug("%s\n", __FUNCTION__);
  49         force_sig(SIGBUS, /* info, */ current);
  50         return 0;
  51 }
  52
  53 static int __spu_trap_dma_align(struct spu *spu)
  54 {
  55         pr_debug("%s\n", __FUNCTION__);
  56         force_sig(SIGBUS, /* info, */ current);
  57         return 0;
  58 }
  59
  60 static int __spu_trap_error(struct spu *spu)
  61 {
  62         pr_debug("%s\n", __FUNCTION__);
  63         force_sig(SIGILL, /* info, */ current);
  64         return 0;
  65 }
  66
  67 static void spu_restart_dma(struct spu *spu)
  68 {
  69         struct spu_priv2 __iomem *priv2 = spu->priv2;
  70
  71         if (!test_bit(SPU_CONTEXT_SWITCH_PENDING, &spu->flags))
  72                 out_be64(&priv2->mfc_control_RW, MFC_CNTL_RESTART_DMA_COMMAND);
  73 }
  74
  75 static int __spu_trap_data_seg(struct spu *spu, unsigned long ea)
  76 {
  77         struct spu_priv2 __iomem *priv2 = spu->priv2;
  78         struct mm_struct *mm = spu->mm;
  79         u64 esid, vsid, llp;
  80
  81         pr_debug("%s\n", __FUNCTION__);
  82
  83         if (test_bit(SPU_CONTEXT_SWITCH_ACTIVE, &spu->flags)) {
  84                 /* SLBs are pre-loaded for context switch, so
  85                  * we should never get here!
  86                  */
  87                 printk("%s: invalid access during switch!\n", __func__);
  88                 return 1;
  89         }
  90         if (!mm || (REGION_ID(ea) != USER_REGION_ID)) {
  91                 /* Future: support kernel segments so that drivers
  92                  * can use SPUs.
  93                  */
  94                 pr_debug("invalid region access at %016lx\n", ea);
  95                 return 1;
  96         }
  97
  98         esid = (ea & ESID_MASK) | SLB_ESID_V;
  99 #ifdef CONFIG_HUGETLB_PAGE
 100         if (in_hugepage_area(mm->context, ea))
 101                 llp = mmu_psize_defs[mmu_huge_psize].sllp;
 102         else
 103 #endif
 104                 llp = mmu_psize_defs[mmu_virtual_psize].sllp;
 105         vsid = (get_vsid(mm->context.id, ea) << SLB_VSID_SHIFT) |
 106                         SLB_VSID_USER | llp;
 107
 108         out_be64(&priv2->slb_index_W, spu->slb_replace);
 109         out_be64(&priv2->slb_vsid_RW, vsid);
 110         out_be64(&priv2->slb_esid_RW, esid);
 111
 112         spu->slb_replace++;
 113         if (spu->slb_replace >= 8)
 114                 spu->slb_replace = 0;
 115
 116         spu_restart_dma(spu);
 117
 118         return 0;
 119 }
 120
 121 extern int hash_page(unsigned long ea, unsigned long access, unsigned long trap); //XXX
 122 static int __spu_trap_data_map(struct spu *spu, unsigned long ea, u64 dsisr)
 123 {
 124         pr_debug("%s, %lx, %lx\n", __FUNCTION__, dsisr, ea);
 125
 126         /* Handle kernel space hash faults immediately.
 127            User hash faults need to be deferred to process context. */
 128         if ((dsisr & MFC_DSISR_PTE_NOT_FOUND)
 129             && REGION_ID(ea) != USER_REGION_ID
 130             && hash_page(ea, _PAGE_PRESENT, 0x300) == 0) {
 131                 spu_restart_dma(spu);
 132                 return 0;
 133         }
 134
 135         if (test_bit(SPU_CONTEXT_SWITCH_ACTIVE, &spu->flags)) {
 136                 printk("%s: invalid access during switch!\n", __func__);
 137                 return 1;
 138         }
 139
 140         spu->dar = ea;
 141         spu->dsisr = dsisr;
 142         mb();
 143         spu->stop_callback(spu);
 144         return 0;
 145 }
 146
 147 static irqreturn_t
 148 spu_irq_class_0(int irq, void *data, struct pt_regs *regs)
 149 {
 150         struct spu *spu;
 151
 152         spu = data;
 153         spu->class_0_pending = 1;
 154         spu->stop_callback(spu);
 155
 156         return IRQ_HANDLED;
 157 }
 158
 159 int
 160 spu_irq_class_0_bottom(struct spu *spu)
 161 {
 162         unsigned long stat, mask;
 163
 164         spu->class_0_pending = 0;
 165
 166         mask = spu_int_mask_get(spu, 0);
 167         stat = spu_int_stat_get(spu, 0);
 168
 169         stat &= mask;
 170
 171         if (stat & 1) /* invalid MFC DMA */
 172                 __spu_trap_invalid_dma(spu);
 173
 174         if (stat & 2) /* invalid DMA alignment */
 175                 __spu_trap_dma_align(spu);
 176
 177         if (stat & 4) /* error on SPU */
 178                 __spu_trap_error(spu);
 179
 180         spu_int_stat_clear(spu, 0, stat);
 181
 182         return (stat & 0x7) ? -EIO : 0;
 183 }
 184 EXPORT_SYMBOL_GPL(spu_irq_class_0_bottom);
 185
 186 static irqreturn_t
 187 spu_irq_class_1(int irq, void *data, struct pt_regs *regs)
 188 {
 189         struct spu *spu;
 190         unsigned long stat, mask, dar, dsisr;
 191
 192         spu = data;
 193
 194         /* atomically read & clear class1 status. */
 195         spin_lock(&spu->register_lock);
 196         mask  = spu_int_mask_get(spu, 1);
 197         stat  = spu_int_stat_get(spu, 1) & mask;
 198         dar   = spu_mfc_dar_get(spu);
 199         dsisr = spu_mfc_dsisr_get(spu);
 200         if (stat & 2) /* mapping fault */
 201                 spu_mfc_dsisr_set(spu, 0ul);
 202         spu_int_stat_clear(spu, 1, stat);
 203         spin_unlock(&spu->register_lock);
 204         pr_debug("%s: %lx %lx %lx %lx\n", __FUNCTION__, mask, stat,
 205                         dar, dsisr);
 206
 207         if (stat & 1) /* segment fault */
 208                 __spu_trap_data_seg(spu, dar);
 209
 210         if (stat & 2) { /* mapping fault */
 211                 __spu_trap_data_map(spu, dar, dsisr);
 212         }
 213
 214         if (stat & 4) /* ls compare & suspend on get */
 215                 ;
 216
 217         if (stat & 8) /* ls compare & suspend on put */
 218                 ;
 219
 220         return stat ? IRQ_HANDLED : IRQ_NONE;
 221 }
 222 EXPORT_SYMBOL_GPL(spu_irq_class_1_bottom);
 223
 224 static irqreturn_t
 225 spu_irq_class_2(int irq, void *data, struct pt_regs *regs)
 226 {
 227         struct spu *spu;
 228         unsigned long stat;
 229         unsigned long mask;
 230
 231         spu = data;
 232         spin_lock(&spu->register_lock);
 233         stat = spu_int_stat_get(spu, 2);
 234         mask = spu_int_mask_get(spu, 2);
 235         /* ignore interrupts we're not waiting for */
 236         stat &= mask;
 237         /*
 238          * mailbox interrupts (0x1 and 0x10) are level triggered.
 239          * mask them now before acknowledging.
 240          */
 241         if (stat & 0x11)
 242                 spu_int_mask_and(spu, 2, ~(stat & 0x11));
 243         /* acknowledge all interrupts before the callbacks */
 244         spu_int_stat_clear(spu, 2, stat);
 245         spin_unlock(&spu->register_lock);
 246
 247         pr_debug("class 2 interrupt %d, %lx, %lx\n", irq, stat, mask);
 248
 249         if (stat & 1)  /* PPC core mailbox */
 250                 spu->ibox_callback(spu);
 251
 252         if (stat & 2) /* SPU stop-and-signal */
 253                 spu->stop_callback(spu);
 254
 255         if (stat & 4) /* SPU halted */
 256                 spu->stop_callback(spu);
 257
 258         if (stat & 8) /* DMA tag group complete */
 259                 spu->mfc_callback(spu);
 260
 261         if (stat & 0x10) /* SPU mailbox threshold */
 262                 spu->wbox_callback(spu);
 263
 264         return stat ? IRQ_HANDLED : IRQ_NONE;
 265 }
 266
 267 static int
 268 spu_request_irqs(struct spu *spu)
 269 {
 270         int ret;
 271         int irq_base;
 272
 273         irq_base = IIC_NODE_STRIDE * spu->node + IIC_SPE_OFFSET;
 274
 275         snprintf(spu->irq_c0, sizeof (spu->irq_c0), "spe%02d.0", spu->number);
 276         ret = request_irq(irq_base + spu->isrc,
 277                  spu_irq_class_0, SA_INTERRUPT, spu->irq_c0, spu);
 278         if (ret)
 279                 goto out;
 280
 281         snprintf(spu->irq_c1, sizeof (spu->irq_c1), "spe%02d.1", spu->number);
 282         ret = request_irq(irq_base + IIC_CLASS_STRIDE + spu->isrc,
 283                  spu_irq_class_1, SA_INTERRUPT, spu->irq_c1, spu);
 284         if (ret)
 285                 goto out1;
 286
 287         snprintf(spu->irq_c2, sizeof (spu->irq_c2), "spe%02d.2", spu->number);
 288         ret = request_irq(irq_base + 2*IIC_CLASS_STRIDE + spu->isrc,
 289                  spu_irq_class_2, SA_INTERRUPT, spu->irq_c2, spu);
 290         if (ret)
 291                 goto out2;
 292         goto out;
 293
 294 out2:
 295         free_irq(irq_base + IIC_CLASS_STRIDE + spu->isrc, spu);
 296 out1:
 297         free_irq(irq_base + spu->isrc, spu);
 298 out:
 299         return ret;
 300 }
 301
 302 static void
 303 spu_free_irqs(struct spu *spu)
 304 {
 305         int irq_base;
 306
 307         irq_base = IIC_NODE_STRIDE * spu->node + IIC_SPE_OFFSET;
 308
 309         free_irq(irq_base + spu->isrc, spu);
 310         free_irq(irq_base + IIC_CLASS_STRIDE + spu->isrc, spu);
 311         free_irq(irq_base + 2*IIC_CLASS_STRIDE + spu->isrc, spu);
 312 }
 313
 314 static LIST_HEAD(spu_list);
 315 static DEFINE_MUTEX(spu_mutex);
 316
 317 static void spu_init_channels(struct spu *spu)
 318 {
 319         static const struct {
 320                  unsigned channel;
 321                  unsigned count;
 322         } zero_list[] = {
 323                 { 0x00, 1, }, { 0x01, 1, }, { 0x03, 1, }, { 0x04, 1, },
 324                 { 0x18, 1, }, { 0x19, 1, }, { 0x1b, 1, }, { 0x1d, 1, },
 325         }, count_list[] = {
 326                 { 0x00, 0, }, { 0x03, 0, }, { 0x04, 0, }, { 0x15, 16, },
 327                 { 0x17, 1, }, { 0x18, 0, }, { 0x19, 0, }, { 0x1b, 0, },
 328                 { 0x1c, 1, }, { 0x1d, 0, }, { 0x1e, 1, },
 329         };
 330         struct spu_priv2 __iomem *priv2;
 331         int i;
 332
 333         priv2 = spu->priv2;
 334
 335         /* initialize all channel data to zero */
 336         for (i = 0; i < ARRAY_SIZE(zero_list); i++) {
 337                 int count;
 338
 339                 out_be64(&priv2->spu_chnlcntptr_RW, zero_list[i].channel);
 340                 for (count = 0; count < zero_list[i].count; count++)
 341                         out_be64(&priv2->spu_chnldata_RW, 0);
 342         }
 343
 344         /* initialize channel counts to meaningful values */
 345         for (i = 0; i < ARRAY_SIZE(count_list); i++) {
 346                 out_be64(&priv2->spu_chnlcntptr_RW, count_list[i].channel);
 347                 out_be64(&priv2->spu_chnlcnt_RW, count_list[i].count);
 348         }
 349 }
 350
 351 struct spu *spu_alloc(void)
 352 {
 353         struct spu *spu;
 354
 355         mutex_lock(&spu_mutex);
 356         if (!list_empty(&spu_list)) {
 357                 spu = list_entry(spu_list.next, struct spu, list);
 358                 list_del_init(&spu->list);
 359                 pr_debug("Got SPU %x %d\n", spu->isrc, spu->number);
 360         } else {
 361                 pr_debug("No SPU left\n");
 362                 spu = NULL;
 363         }
 364         mutex_unlock(&spu_mutex);
 365
 366         if (spu)
 367                 spu_init_channels(spu);
 368
 369         return spu;
 370 }
 371 EXPORT_SYMBOL_GPL(spu_alloc);
 372
 373 void spu_free(struct spu *spu)
 374 {
 375         mutex_lock(&spu_mutex);
 376         list_add_tail(&spu->list, &spu_list);
 377         mutex_unlock(&spu_mutex);
 378 }
 379 EXPORT_SYMBOL_GPL(spu_free);
 380
 381 static int spu_handle_mm_fault(struct spu *spu)
 382 {
 383         struct mm_struct *mm = spu->mm;
 384         struct vm_area_struct *vma;
 385         u64 ea, dsisr, is_write;
 386         int ret;
 387
 388         ea = spu->dar;
 389         dsisr = spu->dsisr;
 390 #if 0
 391         if (!IS_VALID_EA(ea)) {
 392                 return -EFAULT;
 393         }
 394 #endif /* XXX */
 395         if (mm == NULL) {
 396                 return -EFAULT;
 397         }
 398         if (mm->pgd == NULL) {
 399                 return -EFAULT;
 400         }
 401
 402         down_read(&mm->mmap_sem);
 403         vma = find_vma(mm, ea);
 404         if (!vma)
 405                 goto bad_area;
 406         if (vma->vm_start <= ea)
 407                 goto good_area;
 408         if (!(vma->vm_flags & VM_GROWSDOWN))
 409                 goto bad_area;
 410 #if 0
 411         if (expand_stack(vma, ea))
 412                 goto bad_area;
 413 #endif /* XXX */
 414 good_area:
 415         is_write = dsisr & MFC_DSISR_ACCESS_PUT;
 416         if (is_write) {
 417                 if (!(vma->vm_flags & VM_WRITE))
 418                         goto bad_area;
 419         } else {
 420                 if (dsisr & MFC_DSISR_ACCESS_DENIED)
 421                         goto bad_area;
 422                 if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
 423                         goto bad_area;
 424         }
 425         ret = 0;
 426         switch (handle_mm_fault(mm, vma, ea, is_write)) {
 427         case VM_FAULT_MINOR:
 428                 current->min_flt++;
 429                 break;
 430         case VM_FAULT_MAJOR:
 431                 current->maj_flt++;
 432                 break;
 433         case VM_FAULT_SIGBUS:
 434                 ret = -EFAULT;
 435                 goto bad_area;
 436         case VM_FAULT_OOM:
 437                 ret = -ENOMEM;
 438                 goto bad_area;
 439         default:
 440                 BUG();
 441         }
 442         up_read(&mm->mmap_sem);
 443         return ret;
 444
 445 bad_area:
 446         up_read(&mm->mmap_sem);
 447         return -EFAULT;
 448 }
 449
 450 int spu_irq_class_1_bottom(struct spu *spu)
 451 {
 452         u64 ea, dsisr, access, error = 0UL;
 453         int ret = 0;
 454
 455         ea = spu->dar;
 456         dsisr = spu->dsisr;
 457         if (dsisr & (MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED)) {
 458                 u64 flags;
 459
 460                 access = (_PAGE_PRESENT | _PAGE_USER);
 461                 access |= (dsisr & MFC_DSISR_ACCESS_PUT) ? _PAGE_RW : 0UL;
 462                 local_irq_save(flags);
 463                 if (hash_page(ea, access, 0x300) != 0)
 464                         error |= CLASS1_ENABLE_STORAGE_FAULT_INTR;
 465                 local_irq_restore(flags);
 466         }
 467         if (error & CLASS1_ENABLE_STORAGE_FAULT_INTR) {
 468                 if ((ret = spu_handle_mm_fault(spu)) != 0)
 469                         error |= CLASS1_ENABLE_STORAGE_FAULT_INTR;
 470                 else
 471                         error &= ~CLASS1_ENABLE_STORAGE_FAULT_INTR;
 472         }
 473         spu->dar = 0UL;
 474         spu->dsisr = 0UL;
 475         if (!error) {
 476                 spu_restart_dma(spu);
 477         } else {
 478                 __spu_trap_invalid_dma(spu);
 479         }
 480         return ret;
 481 }
 482
 483 static int __init find_spu_node_id(struct device_node *spe)
 484 {
 485         unsigned int *id;
 486         struct device_node *cpu;
 487         cpu = spe->parent->parent;
 488         id = (unsigned int *)get_property(cpu, "node-id", NULL);
 489         return id ? *id : 0;
 490 }
 491
 492 static int __init cell_spuprop_present(struct spu *spu, struct device_node *spe,
 493                 const char *prop)
 494 {
 495         static DEFINE_MUTEX(add_spumem_mutex);
 496
 497         struct address_prop {
 498                 unsigned long address;
 499                 unsigned int len;
 500         } __attribute__((packed)) *p;
 501         int proplen;
 502
 503         unsigned long start_pfn, nr_pages;
 504         struct pglist_data *pgdata;
 505         struct zone *zone;
 506         int ret;
 507
 508         p = (void*)get_property(spe, prop, &proplen);
 509         WARN_ON(proplen != sizeof (*p));
 510
 511         start_pfn = p->address >> PAGE_SHIFT;
 512         nr_pages = ((unsigned long)p->len + PAGE_SIZE - 1) >> PAGE_SHIFT;
 513
 514         pgdata = NODE_DATA(spu->nid);
 515         zone = pgdata->node_zones;
 516
 517         /* XXX rethink locking here */
 518         mutex_lock(&add_spumem_mutex);
 519         ret = __add_pages(zone, start_pfn, nr_pages);
 520         mutex_unlock(&add_spumem_mutex);
 521
 522         return ret;
 523 }
 524
 525 static void __iomem * __init map_spe_prop(struct spu *spu,
 526                 struct device_node *n, const char *name)
 527 {
 528         struct address_prop {
 529                 unsigned long address;
 530                 unsigned int len;
 531         } __attribute__((packed)) *prop;
 532
 533         void *p;
 534         int proplen;
 535         void* ret = NULL;
 536         int err = 0;
 537
 538         p = get_property(n, name, &proplen);
 539         if (proplen != sizeof (struct address_prop))
 540                 return NULL;
 541
 542         prop = p;
 543
 544         err = cell_spuprop_present(spu, n, name);
 545         if (err && (err != -EEXIST))
 546                 goto out;
 547
 548         ret = ioremap(prop->address, prop->len);
 549
 550  out:
 551         return ret;
 552 }
 553
 554 static void spu_unmap(struct spu *spu)
 555 {
 556         iounmap(spu->priv2);
 557         iounmap(spu->priv1);
 558         iounmap(spu->problem);
 559         iounmap((u8 __iomem *)spu->local_store);
 560 }
 561
 562 static int __init spu_map_device(struct spu *spu, struct device_node *node)
 563 {
 564         char *prop;
 565         int ret;
 566
 567         ret = -ENODEV;
 568         prop = get_property(node, "isrc", NULL);
 569         if (!prop)
 570                 goto out;
 571         spu->isrc = *(unsigned int *)prop;
 572
 573         spu->name = get_property(node, "name", NULL);
 574         if (!spu->name)
 575                 goto out;
 576
 577         prop = get_property(node, "local-store", NULL);
 578         if (!prop)
 579                 goto out;
 580         spu->local_store_phys = *(unsigned long *)prop;
 581
 582         /* we use local store as ram, not io memory */
 583         spu->local_store = (void __force *)
 584                 map_spe_prop(spu, node, "local-store");
 585         if (!spu->local_store)
 586                 goto out;
 587
 588         prop = get_property(node, "problem", NULL);
 589         if (!prop)
 590                 goto out_unmap;
 591         spu->problem_phys = *(unsigned long *)prop;
 592
 593         spu->problem= map_spe_prop(spu, node, "problem");
 594         if (!spu->problem)
 595                 goto out_unmap;
 596
 597         spu->priv1= map_spe_prop(spu, node, "priv1");
 598         /* priv1 is not available on a hypervisor */
 599
 600         spu->priv2= map_spe_prop(spu, node, "priv2");
 601         if (!spu->priv2)
 602                 goto out_unmap;
 603         ret = 0;
 604         goto out;
 605
 606 out_unmap:
 607         spu_unmap(spu);
 608 out:
 609         return ret;
 610 }
 611
 612 struct sysdev_class spu_sysdev_class = {
 613         set_kset_name("spu")
 614 };
 615
 616 static ssize_t spu_show_isrc(struct sys_device *sysdev, char *buf)
 617 {
 618         struct spu *spu = container_of(sysdev, struct spu, sysdev);
 619         return sprintf(buf, "%d\n", spu->isrc);
 620
 621 }
 622 static SYSDEV_ATTR(isrc, 0400, spu_show_isrc, NULL);
 623
 624 extern int attach_sysdev_to_node(struct sys_device *dev, int nid);
 625
 626 static int spu_create_sysdev(struct spu *spu)
 627 {
 628         int ret;
 629
 630         spu->sysdev.id = spu->number;
 631         spu->sysdev.cls = &spu_sysdev_class;
 632         ret = sysdev_register(&spu->sysdev);
 633         if (ret) {
 634                 printk(KERN_ERR "Can't register SPU %d with sysfs\n",
 635                                 spu->number);
 636                 return ret;
 637         }
 638
 639         sysdev_create_file(&spu->sysdev, &attr_isrc);
 640         sysfs_add_device_to_node(&spu->sysdev, spu->nid);
 641
 642         return 0;
 643 }
 644
 645 static void spu_destroy_sysdev(struct spu *spu)
 646 {
 647         sysdev_remove_file(&spu->sysdev, &attr_isrc);
 648         sysfs_remove_device_from_node(&spu->sysdev, spu->nid);
 649         sysdev_unregister(&spu->sysdev);
 650 }
 651
 652 static int __init create_spu(struct device_node *spe)
 653 {
 654         struct spu *spu;
 655         int ret;
 656         static int number;
 657
 658         ret = -ENOMEM;
 659         spu = kzalloc(sizeof (*spu), GFP_KERNEL);
 660         if (!spu)
 661                 goto out;
 662
 663         ret = spu_map_device(spu, spe);
 664         if (ret)
 665                 goto out_free;
 666
 667         spu->node = find_spu_node_id(spe);
 668         spu->nid = of_node_to_nid(spe);
 669         if (spu->nid == -1)
 670                 spu->nid = 0;
 671         spin_lock_init(&spu->register_lock);
 672         spu_mfc_sdr_set(spu, mfspr(SPRN_SDR1));
 673         spu_mfc_sr1_set(spu, 0x33);
 674         mutex_lock(&spu_mutex);
 675
 676         spu->number = number++;
 677         ret = spu_request_irqs(spu);
 678         if (ret)
 679                 goto out_unmap;
 680
 681         ret = spu_create_sysdev(spu);
 682         if (ret)
 683                 goto out_free_irqs;
 684
 685         list_add(&spu->list, &spu_list);
 686         mutex_unlock(&spu_mutex);
 687
 688         pr_debug(KERN_DEBUG "Using SPE %s %02x %p %p %p %p %d\n",
 689                 spu->name, spu->isrc, spu->local_store,
 690                 spu->problem, spu->priv1, spu->priv2, spu->number);
 691         goto out;
 692
 693 out_free_irqs:
 694         spu_free_irqs(spu);
 695
 696 out_unmap:
 697         mutex_unlock(&spu_mutex);
 698         spu_unmap(spu);
 699 out_free:
 700         kfree(spu);
 701 out:
 702         return ret;
 703 }
 704
 705 static void destroy_spu(struct spu *spu)
 706 {
 707         list_del_init(&spu->list);
 708
 709         spu_destroy_sysdev(spu);
 710         spu_free_irqs(spu);
 711         spu_unmap(spu);
 712         kfree(spu);
 713 }
 714
 715 static void cleanup_spu_base(void)
 716 {
 717         struct spu *spu, *tmp;
 718         mutex_lock(&spu_mutex);
 719         list_for_each_entry_safe(spu, tmp, &spu_list, list)
 720                 destroy_spu(spu);
 721         mutex_unlock(&spu_mutex);
 722         sysdev_class_unregister(&spu_sysdev_class);
 723 }
 724 module_exit(cleanup_spu_base);
 725
 726 static int __init init_spu_base(void)
 727 {
 728         struct device_node *node;
 729         int ret;
 730
 731         /* create sysdev class for spus */
 732         ret = sysdev_class_register(&spu_sysdev_class);
 733         if (ret)
 734                 return ret;
 735
 736         ret = -ENODEV;
 737         for (node = of_find_node_by_type(NULL, "spe");
 738                         node; node = of_find_node_by_type(node, "spe")) {
 739                 ret = create_spu(node);
 740                 if (ret) {
 741                         printk(KERN_WARNING "%s: Error initializing %s\n",
 742                                 __FUNCTION__, node->name);
 743                         cleanup_spu_base();
 744                         break;
 745                 }
 746         }
 747         /* in some old firmware versions, the spe is called 'spc', so we
 748            look for that as well */
 749         for (node = of_find_node_by_type(NULL, "spc");
 750                         node; node = of_find_node_by_type(node, "spc")) {
 751                 ret = create_spu(node);
 752                 if (ret) {
 753                         printk(KERN_WARNING "%s: Error initializing %s\n",
 754                                 __FUNCTION__, node->name);
 755                         cleanup_spu_base();
 756                         break;
 757                 }
 758         }
 759         return ret;
 760 }
 761 module_init(init_spu_base);
 762
 763 MODULE_LICENSE("GPL");
 764 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");