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/spu_csa.h> 38#include <asm/xmon.h> 39#include <asm/prom.h> 40 41const struct spu_management_ops *spu_management_ops; 42EXPORT_SYMBOL_GPL(spu_management_ops); 43 44const struct spu_priv1_ops *spu_priv1_ops; 45EXPORT_SYMBOL_GPL(spu_priv1_ops); 46 47struct cbe_spu_info cbe_spu_info[MAX_NUMNODES]; 48EXPORT_SYMBOL_GPL(cbe_spu_info); 49 50/* 51 * The spufs fault-handling code needs to call force_sig_info to raise signals 52 * on DMA errors. Export it here to avoid general kernel-wide access to this 53 * function 54 */ 55EXPORT_SYMBOL_GPL(force_sig_info); 56 57/* 58 * Protects cbe_spu_info and spu->number. 59 */ 60static DEFINE_SPINLOCK(spu_lock); 61 62/* 63 * List of all spus in the system. 64 * 65 * This list is iterated by callers from irq context and callers that 66 * want to sleep. Thus modifications need to be done with both 67 * spu_full_list_lock and spu_full_list_mutex held, while iterating 68 * through it requires either of these locks. 69 * 70 * In addition spu_full_list_lock protects all assignmens to 71 * spu->mm. 72 */ 73static LIST_HEAD(spu_full_list); 74static DEFINE_SPINLOCK(spu_full_list_lock); 75static DEFINE_MUTEX(spu_full_list_mutex); 76 77struct spu_slb { 78 u64 esid, vsid; 79}; 80 81void spu_invalidate_slbs(struct spu *spu) 82{ 83 struct spu_priv2 __iomem *priv2 = spu->priv2; 84 unsigned long flags; 85 86 spin_lock_irqsave(&spu->register_lock, flags); 87 if (spu_mfc_sr1_get(spu) & MFC_STATE1_RELOCATE_MASK) 88 out_be64(&priv2->slb_invalidate_all_W, 0UL); 89 spin_unlock_irqrestore(&spu->register_lock, flags); 90} 91EXPORT_SYMBOL_GPL(spu_invalidate_slbs); 92 93/* This is called by the MM core when a segment size is changed, to 94 * request a flush of all the SPEs using a given mm 95 */ 96void spu_flush_all_slbs(struct mm_struct *mm) 97{ 98 struct spu *spu; 99 unsigned long flags; 100 101 spin_lock_irqsave(&spu_full_list_lock, flags); 102 list_for_each_entry(spu, &spu_full_list, full_list) { 103 if (spu->mm == mm) 104 spu_invalidate_slbs(spu); 105 } 106 spin_unlock_irqrestore(&spu_full_list_lock, flags); 107} 108 109/* The hack below stinks... try to do something better one of 110 * these days... Does it even work properly with NR_CPUS == 1 ? 111 */ 112static inline void mm_needs_global_tlbie(struct mm_struct *mm) 113{ 114 int nr = (NR_CPUS > 1) ? NR_CPUS : NR_CPUS + 1; 115 116 /* Global TLBIE broadcast required with SPEs. */ 117 bitmap_fill(cpumask_bits(mm_cpumask(mm)), nr); 118} 119 120void spu_associate_mm(struct spu *spu, struct mm_struct *mm) 121{ 122 unsigned long flags; 123 124 spin_lock_irqsave(&spu_full_list_lock, flags); 125 spu->mm = mm; 126 spin_unlock_irqrestore(&spu_full_list_lock, flags); 127 if (mm) 128 mm_needs_global_tlbie(mm); 129} 130EXPORT_SYMBOL_GPL(spu_associate_mm); 131 132int spu_64k_pages_available(void) 133{ 134 return mmu_psize_defs[MMU_PAGE_64K].shift != 0; 135} 136EXPORT_SYMBOL_GPL(spu_64k_pages_available); 137 138static 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 else { 145 set_bit(SPU_CONTEXT_FAULT_PENDING, &spu->flags); 146 mb(); 147 } 148} 149 150static inline void spu_load_slb(struct spu *spu, int slbe, struct spu_slb *slb) 151{ 152 struct spu_priv2 __iomem *priv2 = spu->priv2; 153 154 pr_debug("%s: adding SLB[%d] 0x%016llx 0x%016llx\n", 155 __func__, slbe, slb->vsid, slb->esid); 156 157 out_be64(&priv2->slb_index_W, slbe); 158 /* set invalid before writing vsid */ 159 out_be64(&priv2->slb_esid_RW, 0); 160 /* now it's safe to write the vsid */ 161 out_be64(&priv2->slb_vsid_RW, slb->vsid); 162 /* setting the new esid makes the entry valid again */ 163 out_be64(&priv2->slb_esid_RW, slb->esid); 164} 165 166static int __spu_trap_data_seg(struct spu *spu, unsigned long ea) 167{ 168 struct mm_struct *mm = spu->mm; 169 struct spu_slb slb; 170 int psize; 171 172 pr_debug("%s\n", __func__); 173 174 slb.esid = (ea & ESID_MASK) | SLB_ESID_V; 175 176 switch(REGION_ID(ea)) { 177 case USER_REGION_ID: 178#ifdef CONFIG_PPC_MM_SLICES 179 psize = get_slice_psize(mm, ea); 180#else 181 psize = mm->context.user_psize; 182#endif 183 slb.vsid = (get_vsid(mm->context.id, ea, MMU_SEGSIZE_256M) 184 << SLB_VSID_SHIFT) | SLB_VSID_USER; 185 break; 186 case VMALLOC_REGION_ID: 187 if (ea < VMALLOC_END) 188 psize = mmu_vmalloc_psize; 189 else 190 psize = mmu_io_psize; 191 slb.vsid = (get_kernel_vsid(ea, MMU_SEGSIZE_256M) 192 << SLB_VSID_SHIFT) | SLB_VSID_KERNEL; 193 break; 194 case KERNEL_REGION_ID: 195 psize = mmu_linear_psize; 196 slb.vsid = (get_kernel_vsid(ea, MMU_SEGSIZE_256M) 197 << SLB_VSID_SHIFT) | SLB_VSID_KERNEL; 198 break; 199 default: 200 /* Future: support kernel segments so that drivers 201 * can use SPUs. 202 */ 203 pr_debug("invalid region access at %016lx\n", ea); 204 return 1; 205 } 206 slb.vsid |= mmu_psize_defs[psize].sllp; 207 208 spu_load_slb(spu, spu->slb_replace, &slb); 209 210 spu->slb_replace++; 211 if (spu->slb_replace >= 8) 212 spu->slb_replace = 0; 213 214 spu_restart_dma(spu); 215 spu->stats.slb_flt++; 216 return 0; 217} 218 219extern int hash_page(unsigned long ea, unsigned long access, unsigned long trap); 220static int __spu_trap_data_map(struct spu *spu, unsigned long ea, u64 dsisr) 221{ 222 int ret; 223 224 pr_debug("%s, %llx, %lx\n", __func__, dsisr, ea); 225 226 /* 227 * Handle kernel space hash faults immediately. User hash 228 * faults need to be deferred to process context. 229 */ 230 if ((dsisr & MFC_DSISR_PTE_NOT_FOUND) && 231 (REGION_ID(ea) != USER_REGION_ID)) { 232 233 spin_unlock(&spu->register_lock); 234 ret = hash_page(ea, _PAGE_PRESENT, 0x300); 235 spin_lock(&spu->register_lock); 236 237 if (!ret) { 238 spu_restart_dma(spu); 239 return 0; 240 } 241 } 242 243 spu->class_1_dar = ea; 244 spu->class_1_dsisr = dsisr; 245 246 spu->stop_callback(spu, 1); 247 248 spu->class_1_dar = 0; 249 spu->class_1_dsisr = 0; 250 251 return 0; 252} 253 254static void __spu_kernel_slb(void *addr, struct spu_slb *slb) 255{ 256 unsigned long ea = (unsigned long)addr; 257 u64 llp; 258 259 if (REGION_ID(ea) == KERNEL_REGION_ID) 260 llp = mmu_psize_defs[mmu_linear_psize].sllp; 261 else 262 llp = mmu_psize_defs[mmu_virtual_psize].sllp; 263 264 slb->vsid = (get_kernel_vsid(ea, MMU_SEGSIZE_256M) << SLB_VSID_SHIFT) | 265 SLB_VSID_KERNEL | llp; 266 slb->esid = (ea & ESID_MASK) | SLB_ESID_V; 267} 268 269/** 270 * Given an array of @nr_slbs SLB entries, @slbs, return non-zero if the 271 * address @new_addr is present. 272 */ 273static inline int __slb_present(struct spu_slb *slbs, int nr_slbs, 274 void *new_addr) 275{ 276 unsigned long ea = (unsigned long)new_addr; 277 int i; 278 279 for (i = 0; i < nr_slbs; i++) 280 if (!((slbs[i].esid ^ ea) & ESID_MASK)) 281 return 1; 282 283 return 0; 284} 285 286/** 287 * Setup the SPU kernel SLBs, in preparation for a context save/restore. We 288 * need to map both the context save area, and the save/restore code. 289 * 290 * Because the lscsa and code may cross segment boundaires, we check to see 291 * if mappings are required for the start and end of each range. We currently 292 * assume that the mappings are smaller that one segment - if not, something 293 * is seriously wrong. 294 */ 295void spu_setup_kernel_slbs(struct spu *spu, struct spu_lscsa *lscsa, 296 void *code, int code_size) 297{ 298 struct spu_slb slbs[4]; 299 int i, nr_slbs = 0; 300 /* start and end addresses of both mappings */ 301 void *addrs[] = { 302 lscsa, (void *)lscsa + sizeof(*lscsa) - 1, 303 code, code + code_size - 1 304 }; 305 306 /* check the set of addresses, and create a new entry in the slbs array 307 * if there isn't already a SLB for that address */ 308 for (i = 0; i < ARRAY_SIZE(addrs); i++) { 309 if (__slb_present(slbs, nr_slbs, addrs[i])) 310 continue; 311 312 __spu_kernel_slb(addrs[i], &slbs[nr_slbs]); 313 nr_slbs++; 314 } 315 316 spin_lock_irq(&spu->register_lock); 317 /* Add the set of SLBs */ 318 for (i = 0; i < nr_slbs; i++) 319 spu_load_slb(spu, i, &slbs[i]); 320 spin_unlock_irq(&spu->register_lock); 321} 322EXPORT_SYMBOL_GPL(spu_setup_kernel_slbs); 323 324static irqreturn_t 325spu_irq_class_0(int irq, void *data) 326{ 327 struct spu *spu; 328 unsigned long stat, mask; 329 330 spu = data; 331 332 spin_lock(&spu->register_lock); 333 mask = spu_int_mask_get(spu, 0); 334 stat = spu_int_stat_get(spu, 0) & mask; 335 336 spu->class_0_pending |= stat; 337 spu->class_0_dar = spu_mfc_dar_get(spu); 338 spu->stop_callback(spu, 0); 339 spu->class_0_pending = 0; 340 spu->class_0_dar = 0; 341 342 spu_int_stat_clear(spu, 0, stat); 343 spin_unlock(&spu->register_lock); 344 345 return IRQ_HANDLED; 346} 347 348static irqreturn_t 349spu_irq_class_1(int irq, void *data) 350{ 351 struct spu *spu; 352 unsigned long stat, mask, dar, dsisr; 353 354 spu = data; 355 356 /* atomically read & clear class1 status. */ 357 spin_lock(&spu->register_lock); 358 mask = spu_int_mask_get(spu, 1); 359 stat = spu_int_stat_get(spu, 1) & mask; 360 dar = spu_mfc_dar_get(spu); 361 dsisr = spu_mfc_dsisr_get(spu); 362 if (stat & CLASS1_STORAGE_FAULT_INTR) 363 spu_mfc_dsisr_set(spu, 0ul); 364 spu_int_stat_clear(spu, 1, stat); 365 366 pr_debug("%s: %lx %lx %lx %lx\n", __func__, mask, stat, 367 dar, dsisr); 368 369 if (stat & CLASS1_SEGMENT_FAULT_INTR) 370 __spu_trap_data_seg(spu, dar); 371 372 if (stat & CLASS1_STORAGE_FAULT_INTR) 373 __spu_trap_data_map(spu, dar, dsisr); 374 375 if (stat & CLASS1_LS_COMPARE_SUSPEND_ON_GET_INTR) 376 ; 377 378 if (stat & CLASS1_LS_COMPARE_SUSPEND_ON_PUT_INTR) 379 ; 380 381 spu->class_1_dsisr = 0; 382 spu->class_1_dar = 0; 383 384 spin_unlock(&spu->register_lock); 385 386 return stat ? IRQ_HANDLED : IRQ_NONE; 387} 388 389static irqreturn_t 390spu_irq_class_2(int irq, void *data) 391{ 392 struct spu *spu; 393 unsigned long stat; 394 unsigned long mask; 395 const int mailbox_intrs = 396 CLASS2_MAILBOX_THRESHOLD_INTR | CLASS2_MAILBOX_INTR; 397 398 spu = data; 399 spin_lock(&spu->register_lock); 400 stat = spu_int_stat_get(spu, 2); 401 mask = spu_int_mask_get(spu, 2); 402 /* ignore interrupts we're not waiting for */ 403 stat &= mask; 404 /* mailbox interrupts are level triggered. mask them now before 405 * acknowledging */ 406 if (stat & mailbox_intrs) 407 spu_int_mask_and(spu, 2, ~(stat & mailbox_intrs)); 408 /* acknowledge all interrupts before the callbacks */ 409 spu_int_stat_clear(spu, 2, stat); 410 411 pr_debug("class 2 interrupt %d, %lx, %lx\n", irq, stat, mask); 412 413 if (stat & CLASS2_MAILBOX_INTR) 414 spu->ibox_callback(spu); 415 416 if (stat & CLASS2_SPU_STOP_INTR) 417 spu->stop_callback(spu, 2); 418 419 if (stat & CLASS2_SPU_HALT_INTR) 420 spu->stop_callback(spu, 2); 421 422 if (stat & CLASS2_SPU_DMA_TAG_GROUP_COMPLETE_INTR) 423 spu->mfc_callback(spu); 424 425 if (stat & CLASS2_MAILBOX_THRESHOLD_INTR) 426 spu->wbox_callback(spu); 427 428 spu->stats.class2_intr++; 429 430 spin_unlock(&spu->register_lock); 431 432 return stat ? IRQ_HANDLED : IRQ_NONE; 433} 434 435static int spu_request_irqs(struct spu *spu) 436{ 437 int ret = 0; 438 439 if (spu->irqs[0] != NO_IRQ) { 440 snprintf(spu->irq_c0, sizeof (spu->irq_c0), "spe%02d.0", 441 spu->number); 442 ret = request_irq(spu->irqs[0], spu_irq_class_0, 443 IRQF_DISABLED, 444 spu->irq_c0, spu); 445 if (ret) 446 goto bail0; 447 } 448 if (spu->irqs[1] != NO_IRQ) { 449 snprintf(spu->irq_c1, sizeof (spu->irq_c1), "spe%02d.1", 450 spu->number); 451 ret = request_irq(spu->irqs[1], spu_irq_class_1, 452 IRQF_DISABLED, 453 spu->irq_c1, spu); 454 if (ret) 455 goto bail1; 456 } 457 if (spu->irqs[2] != NO_IRQ) { 458 snprintf(spu->irq_c2, sizeof (spu->irq_c2), "spe%02d.2", 459 spu->number); 460 ret = request_irq(spu->irqs[2], spu_irq_class_2, 461 IRQF_DISABLED, 462 spu->irq_c2, spu); 463 if (ret) 464 goto bail2; 465 } 466 return 0; 467 468bail2: 469 if (spu->irqs[1] != NO_IRQ) 470 free_irq(spu->irqs[1], spu); 471bail1: 472 if (spu->irqs[0] != NO_IRQ) 473 free_irq(spu->irqs[0], spu); 474bail0: 475 return ret; 476} 477 478static void spu_free_irqs(struct spu *spu) 479{ 480 if (spu->irqs[0] != NO_IRQ) 481 free_irq(spu->irqs[0], spu); 482 if (spu->irqs[1] != NO_IRQ) 483 free_irq(spu->irqs[1], spu); 484 if (spu->irqs[2] != NO_IRQ) 485 free_irq(spu->irqs[2], spu); 486} 487 488void spu_init_channels(struct spu *spu) 489{ 490 static const struct { 491 unsigned channel; 492 unsigned count; 493 } zero_list[] = { 494 { 0x00, 1, }, { 0x01, 1, }, { 0x03, 1, }, { 0x04, 1, }, 495 { 0x18, 1, }, { 0x19, 1, }, { 0x1b, 1, }, { 0x1d, 1, }, 496 }, count_list[] = { 497 { 0x00, 0, }, { 0x03, 0, }, { 0x04, 0, }, { 0x15, 16, }, 498 { 0x17, 1, }, { 0x18, 0, }, { 0x19, 0, }, { 0x1b, 0, }, 499 { 0x1c, 1, }, { 0x1d, 0, }, { 0x1e, 1, }, 500 }; 501 struct spu_priv2 __iomem *priv2; 502 int i; 503 504 priv2 = spu->priv2; 505 506 /* initialize all channel data to zero */ 507 for (i = 0; i < ARRAY_SIZE(zero_list); i++) { 508 int count; 509 510 out_be64(&priv2->spu_chnlcntptr_RW, zero_list[i].channel); 511 for (count = 0; count < zero_list[i].count; count++) 512 out_be64(&priv2->spu_chnldata_RW, 0); 513 } 514 515 /* initialize channel counts to meaningful values */ 516 for (i = 0; i < ARRAY_SIZE(count_list); i++) { 517 out_be64(&priv2->spu_chnlcntptr_RW, count_list[i].channel); 518 out_be64(&priv2->spu_chnlcnt_RW, count_list[i].count); 519 } 520} 521EXPORT_SYMBOL_GPL(spu_init_channels); 522 523static int spu_shutdown(struct sys_device *sysdev) 524{ 525 struct spu *spu = container_of(sysdev, struct spu, sysdev); 526 527 spu_free_irqs(spu); 528 spu_destroy_spu(spu); 529 return 0; 530} 531 532static struct sysdev_class spu_sysdev_class = { 533 .name = "spu", 534 .shutdown = spu_shutdown, 535}; 536 537int spu_add_sysdev_attr(struct sysdev_attribute *attr) 538{ 539 struct spu *spu; 540 541 mutex_lock(&spu_full_list_mutex); 542 list_for_each_entry(spu, &spu_full_list, full_list) 543 sysdev_create_file(&spu->sysdev, attr); 544 mutex_unlock(&spu_full_list_mutex); 545 546 return 0; 547} 548EXPORT_SYMBOL_GPL(spu_add_sysdev_attr); 549 550int spu_add_sysdev_attr_group(struct attribute_group *attrs) 551{ 552 struct spu *spu; 553 int rc = 0; 554 555 mutex_lock(&spu_full_list_mutex); 556 list_for_each_entry(spu, &spu_full_list, full_list) { 557 rc = sysfs_create_group(&spu->sysdev.kobj, attrs); 558 559 /* we're in trouble here, but try unwinding anyway */ 560 if (rc) { 561 printk(KERN_ERR "%s: can't create sysfs group '%s'\n", 562 __func__, attrs->name); 563 564 list_for_each_entry_continue_reverse(spu, 565 &spu_full_list, full_list) 566 sysfs_remove_group(&spu->sysdev.kobj, attrs); 567 break; 568 } 569 } 570 571 mutex_unlock(&spu_full_list_mutex); 572 573 return rc; 574} 575EXPORT_SYMBOL_GPL(spu_add_sysdev_attr_group); 576 577 578void spu_remove_sysdev_attr(struct sysdev_attribute *attr) 579{ 580 struct spu *spu; 581 582 mutex_lock(&spu_full_list_mutex); 583 list_for_each_entry(spu, &spu_full_list, full_list) 584 sysdev_remove_file(&spu->sysdev, attr); 585 mutex_unlock(&spu_full_list_mutex); 586} 587EXPORT_SYMBOL_GPL(spu_remove_sysdev_attr); 588 589void spu_remove_sysdev_attr_group(struct attribute_group *attrs) 590{ 591 struct spu *spu; 592 593 mutex_lock(&spu_full_list_mutex); 594 list_for_each_entry(spu, &spu_full_list, full_list) 595 sysfs_remove_group(&spu->sysdev.kobj, attrs); 596 mutex_unlock(&spu_full_list_mutex); 597} 598EXPORT_SYMBOL_GPL(spu_remove_sysdev_attr_group); 599 600static int spu_create_sysdev(struct spu *spu) 601{ 602 int ret; 603 604 spu->sysdev.id = spu->number; 605 spu->sysdev.cls = &spu_sysdev_class; 606 ret = sysdev_register(&spu->sysdev); 607 if (ret) { 608 printk(KERN_ERR "Can't register SPU %d with sysfs\n", 609 spu->number); 610 return ret; 611 } 612 613 sysfs_add_device_to_node(&spu->sysdev, spu->node); 614 615 return 0; 616} 617 618static int __init create_spu(void *data) 619{ 620 struct spu *spu; 621 int ret; 622 static int number; 623 unsigned long flags; 624 struct timespec ts; 625 626 ret = -ENOMEM; 627 spu = kzalloc(sizeof (*spu), GFP_KERNEL); 628 if (!spu) 629 goto out; 630 631 spu->alloc_state = SPU_FREE; 632 633 spin_lock_init(&spu->register_lock); 634 spin_lock(&spu_lock); 635 spu->number = number++; 636 spin_unlock(&spu_lock); 637 638 ret = spu_create_spu(spu, data); 639 640 if (ret) 641 goto out_free; 642 643 spu_mfc_sdr_setup(spu); 644 spu_mfc_sr1_set(spu, 0x33); 645 ret = spu_request_irqs(spu); 646 if (ret) 647 goto out_destroy; 648 649 ret = spu_create_sysdev(spu); 650 if (ret) 651 goto out_free_irqs; 652 653 mutex_lock(&cbe_spu_info[spu->node].list_mutex); 654 list_add(&spu->cbe_list, &cbe_spu_info[spu->node].spus); 655 cbe_spu_info[spu->node].n_spus++; 656 mutex_unlock(&cbe_spu_info[spu->node].list_mutex); 657 658 mutex_lock(&spu_full_list_mutex); 659 spin_lock_irqsave(&spu_full_list_lock, flags); 660 list_add(&spu->full_list, &spu_full_list); 661 spin_unlock_irqrestore(&spu_full_list_lock, flags); 662 mutex_unlock(&spu_full_list_mutex); 663 664 spu->stats.util_state = SPU_UTIL_IDLE_LOADED; 665 ktime_get_ts(&ts); 666 spu->stats.tstamp = timespec_to_ns(&ts); 667 668 INIT_LIST_HEAD(&spu->aff_list); 669 670 goto out; 671 672out_free_irqs: 673 spu_free_irqs(spu); 674out_destroy: 675 spu_destroy_spu(spu); 676out_free: 677 kfree(spu); 678out: 679 return ret; 680} 681 682static const char *spu_state_names[] = { 683 "user", "system", "iowait", "idle" 684}; 685 686static unsigned long long spu_acct_time(struct spu *spu, 687 enum spu_utilization_state state) 688{ 689 struct timespec ts; 690 unsigned long long time = spu->stats.times[state]; 691 692 /* 693 * If the spu is idle or the context is stopped, utilization 694 * statistics are not updated. Apply the time delta from the 695 * last recorded state of the spu. 696 */ 697 if (spu->stats.util_state == state) { 698 ktime_get_ts(&ts); 699 time += timespec_to_ns(&ts) - spu->stats.tstamp; 700 } 701 702 return time / NSEC_PER_MSEC; 703} 704 705 706static ssize_t spu_stat_show(struct sys_device *sysdev, 707 struct sysdev_attribute *attr, char *buf) 708{ 709 struct spu *spu = container_of(sysdev, struct spu, sysdev); 710 711 return sprintf(buf, "%s %llu %llu %llu %llu " 712 "%llu %llu %llu %llu %llu %llu %llu %llu\n", 713 spu_state_names[spu->stats.util_state], 714 spu_acct_time(spu, SPU_UTIL_USER), 715 spu_acct_time(spu, SPU_UTIL_SYSTEM), 716 spu_acct_time(spu, SPU_UTIL_IOWAIT), 717 spu_acct_time(spu, SPU_UTIL_IDLE_LOADED), 718 spu->stats.vol_ctx_switch, 719 spu->stats.invol_ctx_switch, 720 spu->stats.slb_flt, 721 spu->stats.hash_flt, 722 spu->stats.min_flt, 723 spu->stats.maj_flt, 724 spu->stats.class2_intr, 725 spu->stats.libassist); 726} 727 728static SYSDEV_ATTR(stat, 0644, spu_stat_show, NULL); 729 730static int __init init_spu_base(void) 731{ 732 int i, ret = 0; 733 734 for (i = 0; i < MAX_NUMNODES; i++) { 735 mutex_init(&cbe_spu_info[i].list_mutex); 736 INIT_LIST_HEAD(&cbe_spu_info[i].spus); 737 } 738 739 if (!spu_management_ops) 740 goto out; 741 742 /* create sysdev class for spus */ 743 ret = sysdev_class_register(&spu_sysdev_class); 744 if (ret) 745 goto out; 746 747 ret = spu_enumerate_spus(create_spu); 748 749 if (ret < 0) { 750 printk(KERN_WARNING "%s: Error initializing spus\n", 751 __func__); 752 goto out_unregister_sysdev_class; 753 } 754 755 if (ret > 0) 756 fb_append_extra_logo(&logo_spe_clut224, ret); 757 758 mutex_lock(&spu_full_list_mutex); 759 xmon_register_spus(&spu_full_list); 760 crash_register_spus(&spu_full_list); 761 mutex_unlock(&spu_full_list_mutex); 762 spu_add_sysdev_attr(&attr_stat); 763 764 spu_init_affinity(); 765 766 return 0; 767 768 out_unregister_sysdev_class: 769 sysdev_class_unregister(&spu_sysdev_class); 770 out: 771 return ret; 772} 773module_init(init_spu_base); 774 775MODULE_LICENSE("GPL"); 776MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>"); 777