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 DMA alignment */
 172                 __spu_trap_dma_align(spu);
 173
 174         if (stat & 2) /* invalid MFC DMA */
 175                 __spu_trap_invalid_dma(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 spu_request_irqs(struct spu *spu)
 268 {
 269         int ret = 0;
 270
 271         if (spu->irqs[0] != NO_IRQ) {
 272                 snprintf(spu->irq_c0, sizeof (spu->irq_c0), "spe%02d.0",
 273                          spu->number);
 274                 ret = request_irq(spu->irqs[0], spu_irq_class_0,
 275                                   IRQF_DISABLED,
 276                                   spu->irq_c0, spu);
 277                 if (ret)
 278                         goto bail0;
 279         }
 280         if (spu->irqs[1] != NO_IRQ) {
 281                 snprintf(spu->irq_c1, sizeof (spu->irq_c1), "spe%02d.1",
 282                          spu->number);
 283                 ret = request_irq(spu->irqs[1], spu_irq_class_1,
 284                                   IRQF_DISABLED,
 285                                   spu->irq_c1, spu);
 286                 if (ret)
 287                         goto bail1;
 288         }
 289         if (spu->irqs[2] != NO_IRQ) {
 290                 snprintf(spu->irq_c2, sizeof (spu->irq_c2), "spe%02d.2",
 291                          spu->number);
 292                 ret = request_irq(spu->irqs[2], spu_irq_class_2,
 293                                   IRQF_DISABLED,
 294                                   spu->irq_c2, spu);
 295                 if (ret)
 296                         goto bail2;
 297         }
 298         return 0;
 299
 300 bail2:
 301         if (spu->irqs[1] != NO_IRQ)
 302                 free_irq(spu->irqs[1], spu);
 303 bail1:
 304         if (spu->irqs[0] != NO_IRQ)
 305                 free_irq(spu->irqs[0], spu);
 306 bail0:
 307         return ret;
 308 }
 309
 310 static void spu_free_irqs(struct spu *spu)
 311 {
 312         if (spu->irqs[0] != NO_IRQ)
 313                 free_irq(spu->irqs[0], spu);
 314         if (spu->irqs[1] != NO_IRQ)
 315                 free_irq(spu->irqs[1], spu);
 316         if (spu->irqs[2] != NO_IRQ)
 317                 free_irq(spu->irqs[2], spu);
 318 }
 319
 320 static LIST_HEAD(spu_list);
 321 static DEFINE_MUTEX(spu_mutex);
 322
 323 static void spu_init_channels(struct spu *spu)
 324 {
 325         static const struct {
 326                  unsigned channel;
 327                  unsigned count;
 328         } zero_list[] = {
 329                 { 0x00, 1, }, { 0x01, 1, }, { 0x03, 1, }, { 0x04, 1, },
 330                 { 0x18, 1, }, { 0x19, 1, }, { 0x1b, 1, }, { 0x1d, 1, },
 331         }, count_list[] = {
 332                 { 0x00, 0, }, { 0x03, 0, }, { 0x04, 0, }, { 0x15, 16, },
 333                 { 0x17, 1, }, { 0x18, 0, }, { 0x19, 0, }, { 0x1b, 0, },
 334                 { 0x1c, 1, }, { 0x1d, 0, }, { 0x1e, 1, },
 335         };
 336         struct spu_priv2 __iomem *priv2;
 337         int i;
 338
 339         priv2 = spu->priv2;
 340
 341         /* initialize all channel data to zero */
 342         for (i = 0; i < ARRAY_SIZE(zero_list); i++) {
 343                 int count;
 344
 345                 out_be64(&priv2->spu_chnlcntptr_RW, zero_list[i].channel);
 346                 for (count = 0; count < zero_list[i].count; count++)
 347                         out_be64(&priv2->spu_chnldata_RW, 0);
 348         }
 349
 350         /* initialize channel counts to meaningful values */
 351         for (i = 0; i < ARRAY_SIZE(count_list); i++) {
 352                 out_be64(&priv2->spu_chnlcntptr_RW, count_list[i].channel);
 353                 out_be64(&priv2->spu_chnlcnt_RW, count_list[i].count);
 354         }
 355 }
 356
 357 struct spu *spu_alloc(void)
 358 {
 359         struct spu *spu;
 360
 361         mutex_lock(&spu_mutex);
 362         if (!list_empty(&spu_list)) {
 363                 spu = list_entry(spu_list.next, struct spu, list);
 364                 list_del_init(&spu->list);
 365                 pr_debug("Got SPU %x %d\n", spu->isrc, spu->number);
 366         } else {
 367                 pr_debug("No SPU left\n");
 368                 spu = NULL;
 369         }
 370         mutex_unlock(&spu_mutex);
 371
 372         if (spu)
 373                 spu_init_channels(spu);
 374
 375         return spu;
 376 }
 377 EXPORT_SYMBOL_GPL(spu_alloc);
 378
 379 void spu_free(struct spu *spu)
 380 {
 381         mutex_lock(&spu_mutex);
 382         list_add_tail(&spu->list, &spu_list);
 383         mutex_unlock(&spu_mutex);
 384 }
 385 EXPORT_SYMBOL_GPL(spu_free);
 386
 387 static int spu_handle_mm_fault(struct spu *spu)
 388 {
 389         struct mm_struct *mm = spu->mm;
 390         struct vm_area_struct *vma;
 391         u64 ea, dsisr, is_write;
 392         int ret;
 393
 394         ea = spu->dar;
 395         dsisr = spu->dsisr;
 396 #if 0
 397         if (!IS_VALID_EA(ea)) {
 398                 return -EFAULT;
 399         }
 400 #endif /* XXX */
 401         if (mm == NULL) {
 402                 return -EFAULT;
 403         }
 404         if (mm->pgd == NULL) {
 405                 return -EFAULT;
 406         }
 407
 408         down_read(&mm->mmap_sem);
 409         vma = find_vma(mm, ea);
 410         if (!vma)
 411                 goto bad_area;
 412         if (vma->vm_start <= ea)
 413                 goto good_area;
 414         if (!(vma->vm_flags & VM_GROWSDOWN))
 415                 goto bad_area;
 416 #if 0
 417         if (expand_stack(vma, ea))
 418                 goto bad_area;
 419 #endif /* XXX */
 420 good_area:
 421         is_write = dsisr & MFC_DSISR_ACCESS_PUT;
 422         if (is_write) {
 423                 if (!(vma->vm_flags & VM_WRITE))
 424                         goto bad_area;
 425         } else {
 426                 if (dsisr & MFC_DSISR_ACCESS_DENIED)
 427                         goto bad_area;
 428                 if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
 429                         goto bad_area;
 430         }
 431         ret = 0;
 432         switch (handle_mm_fault(mm, vma, ea, is_write)) {
 433         case VM_FAULT_MINOR:
 434                 current->min_flt++;
 435                 break;
 436         case VM_FAULT_MAJOR:
 437                 current->maj_flt++;
 438                 break;
 439         case VM_FAULT_SIGBUS:
 440                 ret = -EFAULT;
 441                 goto bad_area;
 442         case VM_FAULT_OOM:
 443                 ret = -ENOMEM;
 444                 goto bad_area;
 445         default:
 446                 BUG();
 447         }
 448         up_read(&mm->mmap_sem);
 449         return ret;
 450
 451 bad_area:
 452         up_read(&mm->mmap_sem);
 453         return -EFAULT;
 454 }
 455
 456 int spu_irq_class_1_bottom(struct spu *spu)
 457 {
 458         u64 ea, dsisr, access, error = 0UL;
 459         int ret = 0;
 460
 461         ea = spu->dar;
 462         dsisr = spu->dsisr;
 463         if (dsisr & (MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED)) {
 464                 u64 flags;
 465
 466                 access = (_PAGE_PRESENT | _PAGE_USER);
 467                 access |= (dsisr & MFC_DSISR_ACCESS_PUT) ? _PAGE_RW : 0UL;
 468                 local_irq_save(flags);
 469                 if (hash_page(ea, access, 0x300) != 0)
 470                         error |= CLASS1_ENABLE_STORAGE_FAULT_INTR;
 471                 local_irq_restore(flags);
 472         }
 473         if (error & CLASS1_ENABLE_STORAGE_FAULT_INTR) {
 474                 if ((ret = spu_handle_mm_fault(spu)) != 0)
 475                         error |= CLASS1_ENABLE_STORAGE_FAULT_INTR;
 476                 else
 477                         error &= ~CLASS1_ENABLE_STORAGE_FAULT_INTR;
 478         }
 479         spu->dar = 0UL;
 480         spu->dsisr = 0UL;
 481         if (!error) {
 482                 spu_restart_dma(spu);
 483         } else {
 484                 __spu_trap_invalid_dma(spu);
 485         }
 486         return ret;
 487 }
 488
 489 static int __init find_spu_node_id(struct device_node *spe)
 490 {
 491         unsigned int *id;
 492         struct device_node *cpu;
 493         cpu = spe->parent->parent;
 494         id = (unsigned int *)get_property(cpu, "node-id", NULL);
 495         return id ? *id : 0;
 496 }
 497
 498 static int __init cell_spuprop_present(struct spu *spu, struct device_node *spe,
 499                 const char *prop)
 500 {
 501         static DEFINE_MUTEX(add_spumem_mutex);
 502
 503         struct address_prop {
 504                 unsigned long address;
 505                 unsigned int len;
 506         } __attribute__((packed)) *p;
 507         int proplen;
 508
 509         unsigned long start_pfn, nr_pages;
 510         struct pglist_data *pgdata;
 511         struct zone *zone;
 512         int ret;
 513
 514         p = (void*)get_property(spe, prop, &proplen);
 515         WARN_ON(proplen != sizeof (*p));
 516
 517         start_pfn = p->address >> PAGE_SHIFT;
 518         nr_pages = ((unsigned long)p->len + PAGE_SIZE - 1) >> PAGE_SHIFT;
 519
 520         pgdata = NODE_DATA(spu->nid);
 521         zone = pgdata->node_zones;
 522
 523         /* XXX rethink locking here */
 524         mutex_lock(&add_spumem_mutex);
 525         ret = __add_pages(zone, start_pfn, nr_pages);
 526         mutex_unlock(&add_spumem_mutex);
 527
 528         return ret;
 529 }
 530
 531 static void __iomem * __init map_spe_prop(struct spu *spu,
 532                 struct device_node *n, const char *name)
 533 {
 534         struct address_prop {
 535                 unsigned long address;
 536                 unsigned int len;
 537         } __attribute__((packed)) *prop;
 538
 539         void *p;
 540         int proplen;
 541         void* ret = NULL;
 542         int err = 0;
 543
 544         p = get_property(n, name, &proplen);
 545         if (proplen != sizeof (struct address_prop))
 546                 return NULL;
 547
 548         prop = p;
 549
 550         err = cell_spuprop_present(spu, n, name);
 551         if (err && (err != -EEXIST))
 552                 goto out;
 553
 554         ret = ioremap(prop->address, prop->len);
 555
 556  out:
 557         return ret;
 558 }
 559
 560 static void spu_unmap(struct spu *spu)
 561 {
 562         iounmap(spu->priv2);
 563         iounmap(spu->priv1);
 564         iounmap(spu->problem);
 565         iounmap((u8 __iomem *)spu->local_store);
 566 }
 567
 568 /* This function shall be abstracted for HV platforms */
 569 static int __init spu_map_interrupts(struct spu *spu, struct device_node *np)
 570 {
 571         struct irq_host *host;
 572         unsigned int isrc;
 573         u32 *tmp;
 574
 575         host = iic_get_irq_host(spu->node);
 576         if (host == NULL)
 577                 return -ENODEV;
 578
 579         /* Get the interrupt source from the device-tree */
 580         tmp = (u32 *)get_property(np, "isrc", NULL);
 581         if (!tmp)
 582                 return -ENODEV;
 583         spu->isrc = isrc = tmp[0];
 584
 585         /* Now map interrupts of all 3 classes */
 586         spu->irqs[0] = irq_create_mapping(host, 0x00 | isrc);
 587         spu->irqs[1] = irq_create_mapping(host, 0x10 | isrc);
 588         spu->irqs[2] = irq_create_mapping(host, 0x20 | isrc);
 589
 590         /* Right now, we only fail if class 2 failed */
 591         return spu->irqs[2] == NO_IRQ ? -EINVAL : 0;
 592 }
 593
 594 static int __init spu_map_device(struct spu *spu, struct device_node *node)
 595 {
 596         char *prop;
 597         int ret;
 598
 599         ret = -ENODEV;
 600         spu->name = get_property(node, "name", NULL);
 601         if (!spu->name)
 602                 goto out;
 603
 604         prop = get_property(node, "local-store", NULL);
 605         if (!prop)
 606                 goto out;
 607         spu->local_store_phys = *(unsigned long *)prop;
 608
 609         /* we use local store as ram, not io memory */
 610         spu->local_store = (void __force *)
 611                 map_spe_prop(spu, node, "local-store");
 612         if (!spu->local_store)
 613                 goto out;
 614
 615         prop = get_property(node, "problem", NULL);
 616         if (!prop)
 617                 goto out_unmap;
 618         spu->problem_phys = *(unsigned long *)prop;
 619
 620         spu->problem= map_spe_prop(spu, node, "problem");
 621         if (!spu->problem)
 622                 goto out_unmap;
 623
 624         spu->priv1= map_spe_prop(spu, node, "priv1");
 625         /* priv1 is not available on a hypervisor */
 626
 627         spu->priv2= map_spe_prop(spu, node, "priv2");
 628         if (!spu->priv2)
 629                 goto out_unmap;
 630         ret = 0;
 631         goto out;
 632
 633 out_unmap:
 634         spu_unmap(spu);
 635 out:
 636         return ret;
 637 }
 638
 639 struct sysdev_class spu_sysdev_class = {
 640         set_kset_name("spu")
 641 };
 642
 643 static ssize_t spu_show_isrc(struct sys_device *sysdev, char *buf)
 644 {
 645         struct spu *spu = container_of(sysdev, struct spu, sysdev);
 646         return sprintf(buf, "%d\n", spu->isrc);
 647
 648 }
 649 static SYSDEV_ATTR(isrc, 0400, spu_show_isrc, NULL);
 650
 651 extern int attach_sysdev_to_node(struct sys_device *dev, int nid);
 652
 653 static int spu_create_sysdev(struct spu *spu)
 654 {
 655         int ret;
 656
 657         spu->sysdev.id = spu->number;
 658         spu->sysdev.cls = &spu_sysdev_class;
 659         ret = sysdev_register(&spu->sysdev);
 660         if (ret) {
 661                 printk(KERN_ERR "Can't register SPU %d with sysfs\n",
 662                                 spu->number);
 663                 return ret;
 664         }
 665
 666         if (spu->isrc != 0)
 667                 sysdev_create_file(&spu->sysdev, &attr_isrc);
 668         sysfs_add_device_to_node(&spu->sysdev, spu->nid);
 669
 670         return 0;
 671 }
 672
 673 static void spu_destroy_sysdev(struct spu *spu)
 674 {
 675         sysdev_remove_file(&spu->sysdev, &attr_isrc);
 676         sysfs_remove_device_from_node(&spu->sysdev, spu->nid);
 677         sysdev_unregister(&spu->sysdev);
 678 }
 679
 680 static int __init create_spu(struct device_node *spe)
 681 {
 682         struct spu *spu;
 683         int ret;
 684         static int number;
 685
 686         ret = -ENOMEM;
 687         spu = kzalloc(sizeof (*spu), GFP_KERNEL);
 688         if (!spu)
 689                 goto out;
 690
 691         ret = spu_map_device(spu, spe);
 692         if (ret)
 693                 goto out_free;
 694
 695         spu->node = find_spu_node_id(spe);
 696         spu->nid = of_node_to_nid(spe);
 697         if (spu->nid == -1)
 698                 spu->nid = 0;
 699         ret = spu_map_interrupts(spu, spe);
 700         if (ret)
 701                 goto out_unmap;
 702         spin_lock_init(&spu->register_lock);
 703         spu_mfc_sdr_set(spu, mfspr(SPRN_SDR1));
 704         spu_mfc_sr1_set(spu, 0x33);
 705         mutex_lock(&spu_mutex);
 706
 707         spu->number = number++;
 708         ret = spu_request_irqs(spu);
 709         if (ret)
 710                 goto out_unmap;
 711
 712         ret = spu_create_sysdev(spu);
 713         if (ret)
 714                 goto out_free_irqs;
 715
 716         list_add(&spu->list, &spu_list);
 717         mutex_unlock(&spu_mutex);
 718
 719         pr_debug(KERN_DEBUG "Using SPE %s %02x %p %p %p %p %d\n",
 720                 spu->name, spu->isrc, spu->local_store,
 721                 spu->problem, spu->priv1, spu->priv2, spu->number);
 722         goto out;
 723
 724 out_free_irqs:
 725         spu_free_irqs(spu);
 726
 727 out_unmap:
 728         mutex_unlock(&spu_mutex);
 729         spu_unmap(spu);
 730 out_free:
 731         kfree(spu);
 732 out:
 733         return ret;
 734 }
 735
 736 static void destroy_spu(struct spu *spu)
 737 {
 738         list_del_init(&spu->list);
 739
 740         spu_destroy_sysdev(spu);
 741         spu_free_irqs(spu);
 742         spu_unmap(spu);
 743         kfree(spu);
 744 }
 745
 746 static void cleanup_spu_base(void)
 747 {
 748         struct spu *spu, *tmp;
 749         mutex_lock(&spu_mutex);
 750         list_for_each_entry_safe(spu, tmp, &spu_list, list)
 751                 destroy_spu(spu);
 752         mutex_unlock(&spu_mutex);
 753         sysdev_class_unregister(&spu_sysdev_class);
 754 }
 755 module_exit(cleanup_spu_base);
 756
 757 static int __init init_spu_base(void)
 758 {
 759         struct device_node *node;
 760         int ret;
 761
 762         /* create sysdev class for spus */
 763         ret = sysdev_class_register(&spu_sysdev_class);
 764         if (ret)
 765                 return ret;
 766
 767         ret = -ENODEV;
 768         for (node = of_find_node_by_type(NULL, "spe");
 769                         node; node = of_find_node_by_type(node, "spe")) {
 770                 ret = create_spu(node);
 771                 if (ret) {
 772                         printk(KERN_WARNING "%s: Error initializing %s\n",
 773                                 __FUNCTION__, node->name);
 774                         cleanup_spu_base();
 775                         break;
 776                 }
 777         }
 778         /* in some old firmware versions, the spe is called 'spc', so we
 779            look for that as well */
 780         for (node = of_find_node_by_type(NULL, "spc");
 781                         node; node = of_find_node_by_type(node, "spc")) {
 782                 ret = create_spu(node);
 783                 if (ret) {
 784                         printk(KERN_WARNING "%s: Error initializing %s\n",
 785                                 __FUNCTION__, node->name);
 786                         cleanup_spu_base();
 787                         break;
 788                 }
 789         }
 790         return ret;
 791 }
 792 module_init(init_spu_base);
 793
 794 MODULE_LICENSE("GPL");
 795 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");