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/ptrace.h>
  29 #include <linux/slab.h>
  30 #include <linux/wait.h>
  31 #include <linux/mm.h>
  32 #include <linux/io.h>
  33 #include <linux/mutex.h>
  34 #include <linux/linux_logo.h>
  35 #include <asm/spu.h>
  36 #include <asm/spu_priv1.h>
  37 #include <asm/xmon.h>
  38 #include <asm/prom.h>
  39
  40 const struct spu_management_ops *spu_management_ops;
  41 EXPORT_SYMBOL_GPL(spu_management_ops);
  42
  43 const struct spu_priv1_ops *spu_priv1_ops;
  44 EXPORT_SYMBOL_GPL(spu_priv1_ops);
  45
  46 struct cbe_spu_info cbe_spu_info[MAX_NUMNODES];
  47 EXPORT_SYMBOL_GPL(cbe_spu_info);
  48
  49 /*
  50  * Protects cbe_spu_info and spu->number.
  51  */
  52 static DEFINE_SPINLOCK(spu_lock);
  53
  54 /*
  55  * List of all spus in the system.
  56  *
  57  * This list is iterated by callers from irq context and callers that
  58  * want to sleep.  Thus modifications need to be done with both
  59  * spu_full_list_lock and spu_full_list_mutex held, while iterating
  60  * through it requires either of these locks.
  61  *
  62  * In addition spu_full_list_lock protects all assignmens to
  63  * spu->mm.
  64  */
  65 static LIST_HEAD(spu_full_list);
  66 static DEFINE_SPINLOCK(spu_full_list_lock);
  67 static DEFINE_MUTEX(spu_full_list_mutex);
  68
  69 void spu_invalidate_slbs(struct spu *spu)
  70 {
  71         struct spu_priv2 __iomem *priv2 = spu->priv2;
  72
  73         if (spu_mfc_sr1_get(spu) & MFC_STATE1_RELOCATE_MASK)
  74                 out_be64(&priv2->slb_invalidate_all_W, 0UL);
  75 }
  76 EXPORT_SYMBOL_GPL(spu_invalidate_slbs);
  77
  78 /* This is called by the MM core when a segment size is changed, to
  79  * request a flush of all the SPEs using a given mm
  80  */
  81 void spu_flush_all_slbs(struct mm_struct *mm)
  82 {
  83         struct spu *spu;
  84         unsigned long flags;
  85
  86         spin_lock_irqsave(&spu_full_list_lock, flags);
  87         list_for_each_entry(spu, &spu_full_list, full_list) {
  88                 if (spu->mm == mm)
  89                         spu_invalidate_slbs(spu);
  90         }
  91         spin_unlock_irqrestore(&spu_full_list_lock, flags);
  92 }
  93
  94 /* The hack below stinks... try to do something better one of
  95  * these days... Does it even work properly with NR_CPUS == 1 ?
  96  */
  97 static inline void mm_needs_global_tlbie(struct mm_struct *mm)
  98 {
  99         int nr = (NR_CPUS > 1) ? NR_CPUS : NR_CPUS + 1;
 100
 101         /* Global TLBIE broadcast required with SPEs. */
 102         __cpus_setall(&mm->cpu_vm_mask, nr);
 103 }
 104
 105 void spu_associate_mm(struct spu *spu, struct mm_struct *mm)
 106 {
 107         unsigned long flags;
 108
 109         spin_lock_irqsave(&spu_full_list_lock, flags);
 110         spu->mm = mm;
 111         spin_unlock_irqrestore(&spu_full_list_lock, flags);
 112         if (mm)
 113                 mm_needs_global_tlbie(mm);
 114 }
 115 EXPORT_SYMBOL_GPL(spu_associate_mm);
 116
 117 static int __spu_trap_invalid_dma(struct spu *spu)
 118 {
 119         pr_debug("%s\n", __FUNCTION__);
 120         spu->dma_callback(spu, SPE_EVENT_INVALID_DMA);
 121         return 0;
 122 }
 123
 124 static int __spu_trap_dma_align(struct spu *spu)
 125 {
 126         pr_debug("%s\n", __FUNCTION__);
 127         spu->dma_callback(spu, SPE_EVENT_DMA_ALIGNMENT);
 128         return 0;
 129 }
 130
 131 static int __spu_trap_error(struct spu *spu)
 132 {
 133         pr_debug("%s\n", __FUNCTION__);
 134         spu->dma_callback(spu, SPE_EVENT_SPE_ERROR);
 135         return 0;
 136 }
 137
 138 static void spu_restart_dma(struct spu *spu)
 139 {
 140         struct spu_priv2 __iomem *priv2 = spu->priv2;
 141
 142         if (!test_bit(SPU_CONTEXT_SWITCH_PENDING, &spu->flags))
 143                 out_be64(&priv2->mfc_control_RW, MFC_CNTL_RESTART_DMA_COMMAND);
 144 }
 145
 146 static int __spu_trap_data_seg(struct spu *spu, unsigned long ea)
 147 {
 148         struct spu_priv2 __iomem *priv2 = spu->priv2;
 149         struct mm_struct *mm = spu->mm;
 150         u64 esid, vsid, llp;
 151         int psize;
 152
 153         pr_debug("%s\n", __FUNCTION__);
 154
 155         if (test_bit(SPU_CONTEXT_SWITCH_ACTIVE, &spu->flags)) {
 156                 /* SLBs are pre-loaded for context switch, so
 157                  * we should never get here!
 158                  */
 159                 printk("%s: invalid access during switch!\n", __func__);
 160                 return 1;
 161         }
 162         esid = (ea & ESID_MASK) | SLB_ESID_V;
 163
 164         switch(REGION_ID(ea)) {
 165         case USER_REGION_ID:
 166 #ifdef CONFIG_PPC_MM_SLICES
 167                 psize = get_slice_psize(mm, ea);
 168 #else
 169                 psize = mm->context.user_psize;
 170 #endif
 171                 vsid = (get_vsid(mm->context.id, ea, MMU_SEGSIZE_256M) << SLB_VSID_SHIFT) |
 172                                 SLB_VSID_USER;
 173                 break;
 174         case VMALLOC_REGION_ID:
 175                 if (ea < VMALLOC_END)
 176                         psize = mmu_vmalloc_psize;
 177                 else
 178                         psize = mmu_io_psize;
 179                 vsid = (get_kernel_vsid(ea, MMU_SEGSIZE_256M) << SLB_VSID_SHIFT) |
 180                         SLB_VSID_KERNEL;
 181                 break;
 182         case KERNEL_REGION_ID:
 183                 psize = mmu_linear_psize;
 184                 vsid = (get_kernel_vsid(ea, MMU_SEGSIZE_256M) << SLB_VSID_SHIFT) |
 185                         SLB_VSID_KERNEL;
 186                 break;
 187         default:
 188                 /* Future: support kernel segments so that drivers
 189                  * can use SPUs.
 190                  */
 191                 pr_debug("invalid region access at %016lx\n", ea);
 192                 return 1;
 193         }
 194         llp = mmu_psize_defs[psize].sllp;
 195
 196         out_be64(&priv2->slb_index_W, spu->slb_replace);
 197         out_be64(&priv2->slb_vsid_RW, vsid | llp);
 198         out_be64(&priv2->slb_esid_RW, esid);
 199
 200         spu->slb_replace++;
 201         if (spu->slb_replace >= 8)
 202                 spu->slb_replace = 0;
 203
 204         spu_restart_dma(spu);
 205         spu->stats.slb_flt++;
 206         return 0;
 207 }
 208
 209 extern int hash_page(unsigned long ea, unsigned long access, unsigned long trap); //XXX
 210 static int __spu_trap_data_map(struct spu *spu, unsigned long ea, u64 dsisr)
 211 {
 212         pr_debug("%s, %lx, %lx\n", __FUNCTION__, dsisr, ea);
 213
 214         /* Handle kernel space hash faults immediately.
 215            User hash faults need to be deferred to process context. */
 216         if ((dsisr & MFC_DSISR_PTE_NOT_FOUND)
 217             && REGION_ID(ea) != USER_REGION_ID
 218             && hash_page(ea, _PAGE_PRESENT, 0x300) == 0) {
 219                 spu_restart_dma(spu);
 220                 return 0;
 221         }
 222
 223         if (test_bit(SPU_CONTEXT_SWITCH_ACTIVE, &spu->flags)) {
 224                 printk("%s: invalid access during switch!\n", __func__);
 225                 return 1;
 226         }
 227
 228         spu->dar = ea;
 229         spu->dsisr = dsisr;
 230         mb();
 231         spu->stop_callback(spu);
 232         return 0;
 233 }
 234
 235 static irqreturn_t
 236 spu_irq_class_0(int irq, void *data)
 237 {
 238         struct spu *spu;
 239         unsigned long stat, mask;
 240
 241         spu = data;
 242
 243         mask = spu_int_mask_get(spu, 0);
 244         stat = spu_int_stat_get(spu, 0);
 245         stat &= mask;
 246
 247         spin_lock(&spu->register_lock);
 248         spu->class_0_pending |= stat;
 249         spin_unlock(&spu->register_lock);
 250
 251         spu->stop_callback(spu);
 252
 253         spu_int_stat_clear(spu, 0, stat);
 254
 255         return IRQ_HANDLED;
 256 }
 257
 258 int
 259 spu_irq_class_0_bottom(struct spu *spu)
 260 {
 261         unsigned long flags;
 262         unsigned long stat;
 263
 264         spin_lock_irqsave(&spu->register_lock, flags);
 265         stat = spu->class_0_pending;
 266         spu->class_0_pending = 0;
 267
 268         if (stat & 1) /* invalid DMA alignment */
 269                 __spu_trap_dma_align(spu);
 270
 271         if (stat & 2) /* invalid MFC DMA */
 272                 __spu_trap_invalid_dma(spu);
 273
 274         if (stat & 4) /* error on SPU */
 275                 __spu_trap_error(spu);
 276
 277         spin_unlock_irqrestore(&spu->register_lock, flags);
 278
 279         return (stat & 0x7) ? -EIO : 0;
 280 }
 281 EXPORT_SYMBOL_GPL(spu_irq_class_0_bottom);
 282
 283 static irqreturn_t
 284 spu_irq_class_1(int irq, void *data)
 285 {
 286         struct spu *spu;
 287         unsigned long stat, mask, dar, dsisr;
 288
 289         spu = data;
 290
 291         /* atomically read & clear class1 status. */
 292         spin_lock(&spu->register_lock);
 293         mask  = spu_int_mask_get(spu, 1);
 294         stat  = spu_int_stat_get(spu, 1) & mask;
 295         dar   = spu_mfc_dar_get(spu);
 296         dsisr = spu_mfc_dsisr_get(spu);
 297         if (stat & 2) /* mapping fault */
 298                 spu_mfc_dsisr_set(spu, 0ul);
 299         spu_int_stat_clear(spu, 1, stat);
 300         spin_unlock(&spu->register_lock);
 301         pr_debug("%s: %lx %lx %lx %lx\n", __FUNCTION__, mask, stat,
 302                         dar, dsisr);
 303
 304         if (stat & 1) /* segment fault */
 305                 __spu_trap_data_seg(spu, dar);
 306
 307         if (stat & 2) { /* mapping fault */
 308                 __spu_trap_data_map(spu, dar, dsisr);
 309         }
 310
 311         if (stat & 4) /* ls compare & suspend on get */
 312                 ;
 313
 314         if (stat & 8) /* ls compare & suspend on put */
 315                 ;
 316
 317         return stat ? IRQ_HANDLED : IRQ_NONE;
 318 }
 319
 320 static irqreturn_t
 321 spu_irq_class_2(int irq, void *data)
 322 {
 323         struct spu *spu;
 324         unsigned long stat;
 325         unsigned long mask;
 326
 327         spu = data;
 328         spin_lock(&spu->register_lock);
 329         stat = spu_int_stat_get(spu, 2);
 330         mask = spu_int_mask_get(spu, 2);
 331         /* ignore interrupts we're not waiting for */
 332         stat &= mask;
 333         /*
 334          * mailbox interrupts (0x1 and 0x10) are level triggered.
 335          * mask them now before acknowledging.
 336          */
 337         if (stat & 0x11)
 338                 spu_int_mask_and(spu, 2, ~(stat & 0x11));
 339         /* acknowledge all interrupts before the callbacks */
 340         spu_int_stat_clear(spu, 2, stat);
 341         spin_unlock(&spu->register_lock);
 342
 343         pr_debug("class 2 interrupt %d, %lx, %lx\n", irq, stat, mask);
 344
 345         if (stat & 1)  /* PPC core mailbox */
 346                 spu->ibox_callback(spu);
 347
 348         if (stat & 2) /* SPU stop-and-signal */
 349                 spu->stop_callback(spu);
 350
 351         if (stat & 4) /* SPU halted */
 352                 spu->stop_callback(spu);
 353
 354         if (stat & 8) /* DMA tag group complete */
 355                 spu->mfc_callback(spu);
 356
 357         if (stat & 0x10) /* SPU mailbox threshold */
 358                 spu->wbox_callback(spu);
 359
 360         spu->stats.class2_intr++;
 361         return stat ? IRQ_HANDLED : IRQ_NONE;
 362 }
 363
 364 static int spu_request_irqs(struct spu *spu)
 365 {
 366         int ret = 0;
 367
 368         if (spu->irqs[0] != NO_IRQ) {
 369                 snprintf(spu->irq_c0, sizeof (spu->irq_c0), "spe%02d.0",
 370                          spu->number);
 371                 ret = request_irq(spu->irqs[0], spu_irq_class_0,
 372                                   IRQF_DISABLED,
 373                                   spu->irq_c0, spu);
 374                 if (ret)
 375                         goto bail0;
 376         }
 377         if (spu->irqs[1] != NO_IRQ) {
 378                 snprintf(spu->irq_c1, sizeof (spu->irq_c1), "spe%02d.1",
 379                          spu->number);
 380                 ret = request_irq(spu->irqs[1], spu_irq_class_1,
 381                                   IRQF_DISABLED,
 382                                   spu->irq_c1, spu);
 383                 if (ret)
 384                         goto bail1;
 385         }
 386         if (spu->irqs[2] != NO_IRQ) {
 387                 snprintf(spu->irq_c2, sizeof (spu->irq_c2), "spe%02d.2",
 388                          spu->number);
 389                 ret = request_irq(spu->irqs[2], spu_irq_class_2,
 390                                   IRQF_DISABLED,
 391                                   spu->irq_c2, spu);
 392                 if (ret)
 393                         goto bail2;
 394         }
 395         return 0;
 396
 397 bail2:
 398         if (spu->irqs[1] != NO_IRQ)
 399                 free_irq(spu->irqs[1], spu);
 400 bail1:
 401         if (spu->irqs[0] != NO_IRQ)
 402                 free_irq(spu->irqs[0], spu);
 403 bail0:
 404         return ret;
 405 }
 406
 407 static void spu_free_irqs(struct spu *spu)
 408 {
 409         if (spu->irqs[0] != NO_IRQ)
 410                 free_irq(spu->irqs[0], spu);
 411         if (spu->irqs[1] != NO_IRQ)
 412                 free_irq(spu->irqs[1], spu);
 413         if (spu->irqs[2] != NO_IRQ)
 414                 free_irq(spu->irqs[2], spu);
 415 }
 416
 417 void spu_init_channels(struct spu *spu)
 418 {
 419         static const struct {
 420                  unsigned channel;
 421                  unsigned count;
 422         } zero_list[] = {
 423                 { 0x00, 1, }, { 0x01, 1, }, { 0x03, 1, }, { 0x04, 1, },
 424                 { 0x18, 1, }, { 0x19, 1, }, { 0x1b, 1, }, { 0x1d, 1, },
 425         }, count_list[] = {
 426                 { 0x00, 0, }, { 0x03, 0, }, { 0x04, 0, }, { 0x15, 16, },
 427                 { 0x17, 1, }, { 0x18, 0, }, { 0x19, 0, }, { 0x1b, 0, },
 428                 { 0x1c, 1, }, { 0x1d, 0, }, { 0x1e, 1, },
 429         };
 430         struct spu_priv2 __iomem *priv2;
 431         int i;
 432
 433         priv2 = spu->priv2;
 434
 435         /* initialize all channel data to zero */
 436         for (i = 0; i < ARRAY_SIZE(zero_list); i++) {
 437                 int count;
 438
 439                 out_be64(&priv2->spu_chnlcntptr_RW, zero_list[i].channel);
 440                 for (count = 0; count < zero_list[i].count; count++)
 441                         out_be64(&priv2->spu_chnldata_RW, 0);
 442         }
 443
 444         /* initialize channel counts to meaningful values */
 445         for (i = 0; i < ARRAY_SIZE(count_list); i++) {
 446                 out_be64(&priv2->spu_chnlcntptr_RW, count_list[i].channel);
 447                 out_be64(&priv2->spu_chnlcnt_RW, count_list[i].count);
 448         }
 449 }
 450 EXPORT_SYMBOL_GPL(spu_init_channels);
 451
 452 static int spu_shutdown(struct sys_device *sysdev)
 453 {
 454         struct spu *spu = container_of(sysdev, struct spu, sysdev);
 455
 456         spu_free_irqs(spu);
 457         spu_destroy_spu(spu);
 458         return 0;
 459 }
 460
 461 static struct sysdev_class spu_sysdev_class = {
 462         .name = "spu",
 463         .shutdown = spu_shutdown,
 464 };
 465
 466 int spu_add_sysdev_attr(struct sysdev_attribute *attr)
 467 {
 468         struct spu *spu;
 469
 470         mutex_lock(&spu_full_list_mutex);
 471         list_for_each_entry(spu, &spu_full_list, full_list)
 472                 sysdev_create_file(&spu->sysdev, attr);
 473         mutex_unlock(&spu_full_list_mutex);
 474
 475         return 0;
 476 }
 477 EXPORT_SYMBOL_GPL(spu_add_sysdev_attr);
 478
 479 int spu_add_sysdev_attr_group(struct attribute_group *attrs)
 480 {
 481         struct spu *spu;
 482
 483         mutex_lock(&spu_full_list_mutex);
 484         list_for_each_entry(spu, &spu_full_list, full_list)
 485                 sysfs_create_group(&spu->sysdev.kobj, attrs);
 486         mutex_unlock(&spu_full_list_mutex);
 487
 488         return 0;
 489 }
 490 EXPORT_SYMBOL_GPL(spu_add_sysdev_attr_group);
 491
 492
 493 void spu_remove_sysdev_attr(struct sysdev_attribute *attr)
 494 {
 495         struct spu *spu;
 496
 497         mutex_lock(&spu_full_list_mutex);
 498         list_for_each_entry(spu, &spu_full_list, full_list)
 499                 sysdev_remove_file(&spu->sysdev, attr);
 500         mutex_unlock(&spu_full_list_mutex);
 501 }
 502 EXPORT_SYMBOL_GPL(spu_remove_sysdev_attr);
 503
 504 void spu_remove_sysdev_attr_group(struct attribute_group *attrs)
 505 {
 506         struct spu *spu;
 507
 508         mutex_lock(&spu_full_list_mutex);
 509         list_for_each_entry(spu, &spu_full_list, full_list)
 510                 sysfs_remove_group(&spu->sysdev.kobj, attrs);
 511         mutex_unlock(&spu_full_list_mutex);
 512 }
 513 EXPORT_SYMBOL_GPL(spu_remove_sysdev_attr_group);
 514
 515 static int spu_create_sysdev(struct spu *spu)
 516 {
 517         int ret;
 518
 519         spu->sysdev.id = spu->number;
 520         spu->sysdev.cls = &spu_sysdev_class;
 521         ret = sysdev_register(&spu->sysdev);
 522         if (ret) {
 523                 printk(KERN_ERR "Can't register SPU %d with sysfs\n",
 524                                 spu->number);
 525                 return ret;
 526         }
 527
 528         sysfs_add_device_to_node(&spu->sysdev, spu->node);
 529
 530         return 0;
 531 }
 532
 533 static int __init create_spu(void *data)
 534 {
 535         struct spu *spu;
 536         int ret;
 537         static int number;
 538         unsigned long flags;
 539         struct timespec ts;
 540
 541         ret = -ENOMEM;
 542         spu = kzalloc(sizeof (*spu), GFP_KERNEL);
 543         if (!spu)
 544                 goto out;
 545
 546         spu->alloc_state = SPU_FREE;
 547
 548         spin_lock_init(&spu->register_lock);
 549         spin_lock(&spu_lock);
 550         spu->number = number++;
 551         spin_unlock(&spu_lock);
 552
 553         ret = spu_create_spu(spu, data);
 554
 555         if (ret)
 556                 goto out_free;
 557
 558         spu_mfc_sdr_setup(spu);
 559         spu_mfc_sr1_set(spu, 0x33);
 560         ret = spu_request_irqs(spu);
 561         if (ret)
 562                 goto out_destroy;
 563
 564         ret = spu_create_sysdev(spu);
 565         if (ret)
 566                 goto out_free_irqs;
 567
 568         mutex_lock(&cbe_spu_info[spu->node].list_mutex);
 569         list_add(&spu->cbe_list, &cbe_spu_info[spu->node].spus);
 570         cbe_spu_info[spu->node].n_spus++;
 571         mutex_unlock(&cbe_spu_info[spu->node].list_mutex);
 572
 573         mutex_lock(&spu_full_list_mutex);
 574         spin_lock_irqsave(&spu_full_list_lock, flags);
 575         list_add(&spu->full_list, &spu_full_list);
 576         spin_unlock_irqrestore(&spu_full_list_lock, flags);
 577         mutex_unlock(&spu_full_list_mutex);
 578
 579         spu->stats.util_state = SPU_UTIL_IDLE_LOADED;
 580         ktime_get_ts(&ts);
 581         spu->stats.tstamp = timespec_to_ns(&ts);
 582
 583         INIT_LIST_HEAD(&spu->aff_list);
 584
 585         goto out;
 586
 587 out_free_irqs:
 588         spu_free_irqs(spu);
 589 out_destroy:
 590         spu_destroy_spu(spu);
 591 out_free:
 592         kfree(spu);
 593 out:
 594         return ret;
 595 }
 596
 597 static const char *spu_state_names[] = {
 598         "user", "system", "iowait", "idle"
 599 };
 600
 601 static unsigned long long spu_acct_time(struct spu *spu,
 602                 enum spu_utilization_state state)
 603 {
 604         struct timespec ts;
 605         unsigned long long time = spu->stats.times[state];
 606
 607         /*
 608          * If the spu is idle or the context is stopped, utilization
 609          * statistics are not updated.  Apply the time delta from the
 610          * last recorded state of the spu.
 611          */
 612         if (spu->stats.util_state == state) {
 613                 ktime_get_ts(&ts);
 614                 time += timespec_to_ns(&ts) - spu->stats.tstamp;
 615         }
 616
 617         return time / NSEC_PER_MSEC;
 618 }
 619
 620
 621 static ssize_t spu_stat_show(struct sys_device *sysdev, char *buf)
 622 {
 623         struct spu *spu = container_of(sysdev, struct spu, sysdev);
 624
 625         return sprintf(buf, "%s %llu %llu %llu %llu "
 626                       "%llu %llu %llu %llu %llu %llu %llu %llu\n",
 627                 spu_state_names[spu->stats.util_state],
 628                 spu_acct_time(spu, SPU_UTIL_USER),
 629                 spu_acct_time(spu, SPU_UTIL_SYSTEM),
 630                 spu_acct_time(spu, SPU_UTIL_IOWAIT),
 631                 spu_acct_time(spu, SPU_UTIL_IDLE_LOADED),
 632                 spu->stats.vol_ctx_switch,
 633                 spu->stats.invol_ctx_switch,
 634                 spu->stats.slb_flt,
 635                 spu->stats.hash_flt,
 636                 spu->stats.min_flt,
 637                 spu->stats.maj_flt,
 638                 spu->stats.class2_intr,
 639                 spu->stats.libassist);
 640 }
 641
 642 static SYSDEV_ATTR(stat, 0644, spu_stat_show, NULL);
 643
 644 static int __init init_spu_base(void)
 645 {
 646         int i, ret = 0;
 647
 648         for (i = 0; i < MAX_NUMNODES; i++) {
 649                 mutex_init(&cbe_spu_info[i].list_mutex);
 650                 INIT_LIST_HEAD(&cbe_spu_info[i].spus);
 651         }
 652
 653         if (!spu_management_ops)
 654                 goto out;
 655
 656         /* create sysdev class for spus */
 657         ret = sysdev_class_register(&spu_sysdev_class);
 658         if (ret)
 659                 goto out;
 660
 661         ret = spu_enumerate_spus(create_spu);
 662
 663         if (ret < 0) {
 664                 printk(KERN_WARNING "%s: Error initializing spus\n",
 665                         __FUNCTION__);
 666                 goto out_unregister_sysdev_class;
 667         }
 668
 669         if (ret > 0) {
 670                 /*
 671                  * We cannot put the forward declaration in
 672                  * <linux/linux_logo.h> because of conflicting session type
 673                  * conflicts for const and __initdata with different compiler
 674                  * versions
 675                  */
 676                 extern const struct linux_logo logo_spe_clut224;
 677
 678                 fb_append_extra_logo(&logo_spe_clut224, ret);
 679         }
 680
 681         mutex_lock(&spu_full_list_mutex);
 682         xmon_register_spus(&spu_full_list);
 683         crash_register_spus(&spu_full_list);
 684         mutex_unlock(&spu_full_list_mutex);
 685         spu_add_sysdev_attr(&attr_stat);
 686
 687         spu_init_affinity();
 688
 689         return 0;
 690
 691  out_unregister_sysdev_class:
 692         sysdev_class_unregister(&spu_sysdev_class);
 693  out:
 694         return ret;
 695 }
 696 module_init(init_spu_base);
 697
 698 MODULE_LICENSE("GPL");
 699 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");