arch/powerpc/platforms/cell/spufs/file.c

   1 /*
   2  * SPU file system -- file contents
   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/fs.h>
  26 #include <linux/ioctl.h>
  27 #include <linux/module.h>
  28 #include <linux/pagemap.h>
  29 #include <linux/poll.h>
  30 #include <linux/ptrace.h>
  31 #include <linux/seq_file.h>
  32
  33 #include <asm/io.h>
  34 #include <asm/semaphore.h>
  35 #include <asm/spu.h>
  36 #include <asm/spu_info.h>
  37 #include <asm/uaccess.h>
  38
  39 #include "spufs.h"
  40
  41 #define SPUFS_MMAP_4K (PAGE_SIZE == 0x1000)
  42
  43
  44 static int
  45 spufs_mem_open(struct inode *inode, struct file *file)
  46 {
  47         struct spufs_inode_info *i = SPUFS_I(inode);
  48         struct spu_context *ctx = i->i_ctx;
  49
  50         mutex_lock(&ctx->mapping_lock);
  51         file->private_data = ctx;
  52         if (!i->i_openers++)
  53                 ctx->local_store = inode->i_mapping;
  54         mutex_unlock(&ctx->mapping_lock);
  55         return 0;
  56 }
  57
  58 static int
  59 spufs_mem_release(struct inode *inode, struct file *file)
  60 {
  61         struct spufs_inode_info *i = SPUFS_I(inode);
  62         struct spu_context *ctx = i->i_ctx;
  63
  64         mutex_lock(&ctx->mapping_lock);
  65         if (!--i->i_openers)
  66                 ctx->local_store = NULL;
  67         mutex_unlock(&ctx->mapping_lock);
  68         return 0;
  69 }
  70
  71 static ssize_t
  72 __spufs_mem_read(struct spu_context *ctx, char __user *buffer,
  73                         size_t size, loff_t *pos)
  74 {
  75         char *local_store = ctx->ops->get_ls(ctx);
  76         return simple_read_from_buffer(buffer, size, pos, local_store,
  77                                         LS_SIZE);
  78 }
  79
  80 static ssize_t
  81 spufs_mem_read(struct file *file, char __user *buffer,
  82                                 size_t size, loff_t *pos)
  83 {
  84         struct spu_context *ctx = file->private_data;
  85         ssize_t ret;
  86
  87         spu_acquire(ctx);
  88         ret = __spufs_mem_read(ctx, buffer, size, pos);
  89         spu_release(ctx);
  90         return ret;
  91 }
  92
  93 static ssize_t
  94 spufs_mem_write(struct file *file, const char __user *buffer,
  95                                         size_t size, loff_t *ppos)
  96 {
  97         struct spu_context *ctx = file->private_data;
  98         char *local_store;
  99         loff_t pos = *ppos;
 100         int ret;
 101
 102         if (pos < 0)
 103                 return -EINVAL;
 104         if (pos > LS_SIZE)
 105                 return -EFBIG;
 106         if (size > LS_SIZE - pos)
 107                 size = LS_SIZE - pos;
 108
 109         spu_acquire(ctx);
 110         local_store = ctx->ops->get_ls(ctx);
 111         ret = copy_from_user(local_store + pos, buffer, size);
 112         spu_release(ctx);
 113
 114         if (ret)
 115                 return -EFAULT;
 116         *ppos = pos + size;
 117         return size;
 118 }
 119
 120 static unsigned long spufs_mem_mmap_nopfn(struct vm_area_struct *vma,
 121                                           unsigned long address)
 122 {
 123         struct spu_context *ctx = vma->vm_file->private_data;
 124         unsigned long pfn, offset, addr0 = address;
 125 #ifdef CONFIG_SPU_FS_64K_LS
 126         struct spu_state *csa = &ctx->csa;
 127         int psize;
 128
 129         /* Check what page size we are using */
 130         psize = get_slice_psize(vma->vm_mm, address);
 131
 132         /* Some sanity checking */
 133         BUG_ON(csa->use_big_pages != (psize == MMU_PAGE_64K));
 134
 135         /* Wow, 64K, cool, we need to align the address though */
 136         if (csa->use_big_pages) {
 137                 BUG_ON(vma->vm_start & 0xffff);
 138                 address &= ~0xfffful;
 139         }
 140 #endif /* CONFIG_SPU_FS_64K_LS */
 141
 142         offset = (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
 143         if (offset >= LS_SIZE)
 144                 return NOPFN_SIGBUS;
 145
 146         pr_debug("spufs_mem_mmap_nopfn address=0x%lx -> 0x%lx, offset=0x%lx\n",
 147                  addr0, address, offset);
 148
 149         spu_acquire(ctx);
 150
 151         if (ctx->state == SPU_STATE_SAVED) {
 152                 vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
 153                                                         & ~_PAGE_NO_CACHE);
 154                 pfn = vmalloc_to_pfn(ctx->csa.lscsa->ls + offset);
 155         } else {
 156                 vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
 157                                              | _PAGE_NO_CACHE);
 158                 pfn = (ctx->spu->local_store_phys + offset) >> PAGE_SHIFT;
 159         }
 160         vm_insert_pfn(vma, address, pfn);
 161
 162         spu_release(ctx);
 163
 164         return NOPFN_REFAULT;
 165 }
 166
 167
 168 static struct vm_operations_struct spufs_mem_mmap_vmops = {
 169         .nopfn = spufs_mem_mmap_nopfn,
 170 };
 171
 172 static int spufs_mem_mmap(struct file *file, struct vm_area_struct *vma)
 173 {
 174 #ifdef CONFIG_SPU_FS_64K_LS
 175         struct spu_context      *ctx = file->private_data;
 176         struct spu_state        *csa = &ctx->csa;
 177
 178         /* Sanity check VMA alignment */
 179         if (csa->use_big_pages) {
 180                 pr_debug("spufs_mem_mmap 64K, start=0x%lx, end=0x%lx,"
 181                          " pgoff=0x%lx\n", vma->vm_start, vma->vm_end,
 182                          vma->vm_pgoff);
 183                 if (vma->vm_start & 0xffff)
 184                         return -EINVAL;
 185                 if (vma->vm_pgoff & 0xf)
 186                         return -EINVAL;
 187         }
 188 #endif /* CONFIG_SPU_FS_64K_LS */
 189
 190         if (!(vma->vm_flags & VM_SHARED))
 191                 return -EINVAL;
 192
 193         vma->vm_flags |= VM_IO | VM_PFNMAP;
 194         vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
 195                                      | _PAGE_NO_CACHE);
 196
 197         vma->vm_ops = &spufs_mem_mmap_vmops;
 198         return 0;
 199 }
 200
 201 #ifdef CONFIG_SPU_FS_64K_LS
 202 static unsigned long spufs_get_unmapped_area(struct file *file,
 203                 unsigned long addr, unsigned long len, unsigned long pgoff,
 204                 unsigned long flags)
 205 {
 206         struct spu_context      *ctx = file->private_data;
 207         struct spu_state        *csa = &ctx->csa;
 208
 209         /* If not using big pages, fallback to normal MM g_u_a */
 210         if (!csa->use_big_pages)
 211                 return current->mm->get_unmapped_area(file, addr, len,
 212                                                       pgoff, flags);
 213
 214         /* Else, try to obtain a 64K pages slice */
 215         return slice_get_unmapped_area(addr, len, flags,
 216                                        MMU_PAGE_64K, 1, 0);
 217 }
 218 #endif /* CONFIG_SPU_FS_64K_LS */
 219
 220 static const struct file_operations spufs_mem_fops = {
 221         .open                   = spufs_mem_open,
 222         .release                = spufs_mem_release,
 223         .read                   = spufs_mem_read,
 224         .write                  = spufs_mem_write,
 225         .llseek                 = generic_file_llseek,
 226         .mmap                   = spufs_mem_mmap,
 227 #ifdef CONFIG_SPU_FS_64K_LS
 228         .get_unmapped_area      = spufs_get_unmapped_area,
 229 #endif
 230 };
 231
 232 static unsigned long spufs_ps_nopfn(struct vm_area_struct *vma,
 233                                     unsigned long address,
 234                                     unsigned long ps_offs,
 235                                     unsigned long ps_size)
 236 {
 237         struct spu_context *ctx = vma->vm_file->private_data;
 238         unsigned long area, offset = address - vma->vm_start;
 239         int ret;
 240
 241         offset += vma->vm_pgoff << PAGE_SHIFT;
 242         if (offset >= ps_size)
 243                 return NOPFN_SIGBUS;
 244
 245         /* error here usually means a signal.. we might want to test
 246          * the error code more precisely though
 247          */
 248         ret = spu_acquire_runnable(ctx, 0);
 249         if (ret)
 250                 return NOPFN_REFAULT;
 251
 252         area = ctx->spu->problem_phys + ps_offs;
 253         vm_insert_pfn(vma, address, (area + offset) >> PAGE_SHIFT);
 254         spu_release(ctx);
 255
 256         return NOPFN_REFAULT;
 257 }
 258
 259 #if SPUFS_MMAP_4K
 260 static unsigned long spufs_cntl_mmap_nopfn(struct vm_area_struct *vma,
 261                                            unsigned long address)
 262 {
 263         return spufs_ps_nopfn(vma, address, 0x4000, 0x1000);
 264 }
 265
 266 static struct vm_operations_struct spufs_cntl_mmap_vmops = {
 267         .nopfn = spufs_cntl_mmap_nopfn,
 268 };
 269
 270 /*
 271  * mmap support for problem state control area [0x4000 - 0x4fff].
 272  */
 273 static int spufs_cntl_mmap(struct file *file, struct vm_area_struct *vma)
 274 {
 275         if (!(vma->vm_flags & VM_SHARED))
 276                 return -EINVAL;
 277
 278         vma->vm_flags |= VM_IO | VM_PFNMAP;
 279         vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
 280                                      | _PAGE_NO_CACHE | _PAGE_GUARDED);
 281
 282         vma->vm_ops = &spufs_cntl_mmap_vmops;
 283         return 0;
 284 }
 285 #else /* SPUFS_MMAP_4K */
 286 #define spufs_cntl_mmap NULL
 287 #endif /* !SPUFS_MMAP_4K */
 288
 289 static u64 spufs_cntl_get(void *data)
 290 {
 291         struct spu_context *ctx = data;
 292         u64 val;
 293
 294         spu_acquire(ctx);
 295         val = ctx->ops->status_read(ctx);
 296         spu_release(ctx);
 297
 298         return val;
 299 }
 300
 301 static void spufs_cntl_set(void *data, u64 val)
 302 {
 303         struct spu_context *ctx = data;
 304
 305         spu_acquire(ctx);
 306         ctx->ops->runcntl_write(ctx, val);
 307         spu_release(ctx);
 308 }
 309
 310 static int spufs_cntl_open(struct inode *inode, struct file *file)
 311 {
 312         struct spufs_inode_info *i = SPUFS_I(inode);
 313         struct spu_context *ctx = i->i_ctx;
 314
 315         mutex_lock(&ctx->mapping_lock);
 316         file->private_data = ctx;
 317         if (!i->i_openers++)
 318                 ctx->cntl = inode->i_mapping;
 319         mutex_unlock(&ctx->mapping_lock);
 320         return simple_attr_open(inode, file, spufs_cntl_get,
 321                                         spufs_cntl_set, "0x%08lx");
 322 }
 323
 324 static int
 325 spufs_cntl_release(struct inode *inode, struct file *file)
 326 {
 327         struct spufs_inode_info *i = SPUFS_I(inode);
 328         struct spu_context *ctx = i->i_ctx;
 329
 330         simple_attr_close(inode, file);
 331
 332         mutex_lock(&ctx->mapping_lock);
 333         if (!--i->i_openers)
 334                 ctx->cntl = NULL;
 335         mutex_unlock(&ctx->mapping_lock);
 336         return 0;
 337 }
 338
 339 static const struct file_operations spufs_cntl_fops = {
 340         .open = spufs_cntl_open,
 341         .release = spufs_cntl_release,
 342         .read = simple_attr_read,
 343         .write = simple_attr_write,
 344         .mmap = spufs_cntl_mmap,
 345 };
 346
 347 static int
 348 spufs_regs_open(struct inode *inode, struct file *file)
 349 {
 350         struct spufs_inode_info *i = SPUFS_I(inode);
 351         file->private_data = i->i_ctx;
 352         return 0;
 353 }
 354
 355 static ssize_t
 356 __spufs_regs_read(struct spu_context *ctx, char __user *buffer,
 357                         size_t size, loff_t *pos)
 358 {
 359         struct spu_lscsa *lscsa = ctx->csa.lscsa;
 360         return simple_read_from_buffer(buffer, size, pos,
 361                                       lscsa->gprs, sizeof lscsa->gprs);
 362 }
 363
 364 static ssize_t
 365 spufs_regs_read(struct file *file, char __user *buffer,
 366                 size_t size, loff_t *pos)
 367 {
 368         int ret;
 369         struct spu_context *ctx = file->private_data;
 370
 371         spu_acquire_saved(ctx);
 372         ret = __spufs_regs_read(ctx, buffer, size, pos);
 373         spu_release_saved(ctx);
 374         return ret;
 375 }
 376
 377 static ssize_t
 378 spufs_regs_write(struct file *file, const char __user *buffer,
 379                  size_t size, loff_t *pos)
 380 {
 381         struct spu_context *ctx = file->private_data;
 382         struct spu_lscsa *lscsa = ctx->csa.lscsa;
 383         int ret;
 384
 385         size = min_t(ssize_t, sizeof lscsa->gprs - *pos, size);
 386         if (size <= 0)
 387                 return -EFBIG;
 388         *pos += size;
 389
 390         spu_acquire_saved(ctx);
 391
 392         ret = copy_from_user(lscsa->gprs + *pos - size,
 393                              buffer, size) ? -EFAULT : size;
 394
 395         spu_release_saved(ctx);
 396         return ret;
 397 }
 398
 399 static const struct file_operations spufs_regs_fops = {
 400         .open    = spufs_regs_open,
 401         .read    = spufs_regs_read,
 402         .write   = spufs_regs_write,
 403         .llseek  = generic_file_llseek,
 404 };
 405
 406 static ssize_t
 407 __spufs_fpcr_read(struct spu_context *ctx, char __user * buffer,
 408                         size_t size, loff_t * pos)
 409 {
 410         struct spu_lscsa *lscsa = ctx->csa.lscsa;
 411         return simple_read_from_buffer(buffer, size, pos,
 412                                       &lscsa->fpcr, sizeof(lscsa->fpcr));
 413 }
 414
 415 static ssize_t
 416 spufs_fpcr_read(struct file *file, char __user * buffer,
 417                 size_t size, loff_t * pos)
 418 {
 419         int ret;
 420         struct spu_context *ctx = file->private_data;
 421
 422         spu_acquire_saved(ctx);
 423         ret = __spufs_fpcr_read(ctx, buffer, size, pos);
 424         spu_release_saved(ctx);
 425         return ret;
 426 }
 427
 428 static ssize_t
 429 spufs_fpcr_write(struct file *file, const char __user * buffer,
 430                  size_t size, loff_t * pos)
 431 {
 432         struct spu_context *ctx = file->private_data;
 433         struct spu_lscsa *lscsa = ctx->csa.lscsa;
 434         int ret;
 435
 436         size = min_t(ssize_t, sizeof(lscsa->fpcr) - *pos, size);
 437         if (size <= 0)
 438                 return -EFBIG;
 439         *pos += size;
 440
 441         spu_acquire_saved(ctx);
 442
 443         ret = copy_from_user((char *)&lscsa->fpcr + *pos - size,
 444                              buffer, size) ? -EFAULT : size;
 445
 446         spu_release_saved(ctx);
 447         return ret;
 448 }
 449
 450 static const struct file_operations spufs_fpcr_fops = {
 451         .open = spufs_regs_open,
 452         .read = spufs_fpcr_read,
 453         .write = spufs_fpcr_write,
 454         .llseek = generic_file_llseek,
 455 };
 456
 457 /* generic open function for all pipe-like files */
 458 static int spufs_pipe_open(struct inode *inode, struct file *file)
 459 {
 460         struct spufs_inode_info *i = SPUFS_I(inode);
 461         file->private_data = i->i_ctx;
 462
 463         return nonseekable_open(inode, file);
 464 }
 465
 466 /*
 467  * Read as many bytes from the mailbox as possible, until
 468  * one of the conditions becomes true:
 469  *
 470  * - no more data available in the mailbox
 471  * - end of the user provided buffer
 472  * - end of the mapped area
 473  */
 474 static ssize_t spufs_mbox_read(struct file *file, char __user *buf,
 475                         size_t len, loff_t *pos)
 476 {
 477         struct spu_context *ctx = file->private_data;
 478         u32 mbox_data, __user *udata;
 479         ssize_t count;
 480
 481         if (len < 4)
 482                 return -EINVAL;
 483
 484         if (!access_ok(VERIFY_WRITE, buf, len))
 485                 return -EFAULT;
 486
 487         udata = (void __user *)buf;
 488
 489         spu_acquire(ctx);
 490         for (count = 0; (count + 4) <= len; count += 4, udata++) {
 491                 int ret;
 492                 ret = ctx->ops->mbox_read(ctx, &mbox_data);
 493                 if (ret == 0)
 494                         break;
 495
 496                 /*
 497                  * at the end of the mapped area, we can fault
 498                  * but still need to return the data we have
 499                  * read successfully so far.
 500                  */
 501                 ret = __put_user(mbox_data, udata);
 502                 if (ret) {
 503                         if (!count)
 504                                 count = -EFAULT;
 505                         break;
 506                 }
 507         }
 508         spu_release(ctx);
 509
 510         if (!count)
 511                 count = -EAGAIN;
 512
 513         return count;
 514 }
 515
 516 static const struct file_operations spufs_mbox_fops = {
 517         .open   = spufs_pipe_open,
 518         .read   = spufs_mbox_read,
 519 };
 520
 521 static ssize_t spufs_mbox_stat_read(struct file *file, char __user *buf,
 522                         size_t len, loff_t *pos)
 523 {
 524         struct spu_context *ctx = file->private_data;
 525         u32 mbox_stat;
 526
 527         if (len < 4)
 528                 return -EINVAL;
 529
 530         spu_acquire(ctx);
 531
 532         mbox_stat = ctx->ops->mbox_stat_read(ctx) & 0xff;
 533
 534         spu_release(ctx);
 535
 536         if (copy_to_user(buf, &mbox_stat, sizeof mbox_stat))
 537                 return -EFAULT;
 538
 539         return 4;
 540 }
 541
 542 static const struct file_operations spufs_mbox_stat_fops = {
 543         .open   = spufs_pipe_open,
 544         .read   = spufs_mbox_stat_read,
 545 };
 546
 547 /* low-level ibox access function */
 548 size_t spu_ibox_read(struct spu_context *ctx, u32 *data)
 549 {
 550         return ctx->ops->ibox_read(ctx, data);
 551 }
 552
 553 static int spufs_ibox_fasync(int fd, struct file *file, int on)
 554 {
 555         struct spu_context *ctx = file->private_data;
 556
 557         return fasync_helper(fd, file, on, &ctx->ibox_fasync);
 558 }
 559
 560 /* interrupt-level ibox callback function. */
 561 void spufs_ibox_callback(struct spu *spu)
 562 {
 563         struct spu_context *ctx = spu->ctx;
 564
 565         wake_up_all(&ctx->ibox_wq);
 566         kill_fasync(&ctx->ibox_fasync, SIGIO, POLLIN);
 567 }
 568
 569 /*
 570  * Read as many bytes from the interrupt mailbox as possible, until
 571  * one of the conditions becomes true:
 572  *
 573  * - no more data available in the mailbox
 574  * - end of the user provided buffer
 575  * - end of the mapped area
 576  *
 577  * If the file is opened without O_NONBLOCK, we wait here until
 578  * any data is available, but return when we have been able to
 579  * read something.
 580  */
 581 static ssize_t spufs_ibox_read(struct file *file, char __user *buf,
 582                         size_t len, loff_t *pos)
 583 {
 584         struct spu_context *ctx = file->private_data;
 585         u32 ibox_data, __user *udata;
 586         ssize_t count;
 587
 588         if (len < 4)
 589                 return -EINVAL;
 590
 591         if (!access_ok(VERIFY_WRITE, buf, len))
 592                 return -EFAULT;
 593
 594         udata = (void __user *)buf;
 595
 596         spu_acquire(ctx);
 597
 598         /* wait only for the first element */
 599         count = 0;
 600         if (file->f_flags & O_NONBLOCK) {
 601                 if (!spu_ibox_read(ctx, &ibox_data))
 602                         count = -EAGAIN;
 603         } else {
 604                 count = spufs_wait(ctx->ibox_wq, spu_ibox_read(ctx, &ibox_data));
 605         }
 606         if (count)
 607                 goto out;
 608
 609         /* if we can't write at all, return -EFAULT */
 610         count = __put_user(ibox_data, udata);
 611         if (count)
 612                 goto out;
 613
 614         for (count = 4, udata++; (count + 4) <= len; count += 4, udata++) {
 615                 int ret;
 616                 ret = ctx->ops->ibox_read(ctx, &ibox_data);
 617                 if (ret == 0)
 618                         break;
 619                 /*
 620                  * at the end of the mapped area, we can fault
 621                  * but still need to return the data we have
 622                  * read successfully so far.
 623                  */
 624                 ret = __put_user(ibox_data, udata);
 625                 if (ret)
 626                         break;
 627         }
 628
 629 out:
 630         spu_release(ctx);
 631
 632         return count;
 633 }
 634
 635 static unsigned int spufs_ibox_poll(struct file *file, poll_table *wait)
 636 {
 637         struct spu_context *ctx = file->private_data;
 638         unsigned int mask;
 639
 640         poll_wait(file, &ctx->ibox_wq, wait);
 641
 642         spu_acquire(ctx);
 643         mask = ctx->ops->mbox_stat_poll(ctx, POLLIN | POLLRDNORM);
 644         spu_release(ctx);
 645
 646         return mask;
 647 }
 648
 649 static const struct file_operations spufs_ibox_fops = {
 650         .open   = spufs_pipe_open,
 651         .read   = spufs_ibox_read,
 652         .poll   = spufs_ibox_poll,
 653         .fasync = spufs_ibox_fasync,
 654 };
 655
 656 static ssize_t spufs_ibox_stat_read(struct file *file, char __user *buf,
 657                         size_t len, loff_t *pos)
 658 {
 659         struct spu_context *ctx = file->private_data;
 660         u32 ibox_stat;
 661
 662         if (len < 4)
 663                 return -EINVAL;
 664
 665         spu_acquire(ctx);
 666         ibox_stat = (ctx->ops->mbox_stat_read(ctx) >> 16) & 0xff;
 667         spu_release(ctx);
 668
 669         if (copy_to_user(buf, &ibox_stat, sizeof ibox_stat))
 670                 return -EFAULT;
 671
 672         return 4;
 673 }
 674
 675 static const struct file_operations spufs_ibox_stat_fops = {
 676         .open   = spufs_pipe_open,
 677         .read   = spufs_ibox_stat_read,
 678 };
 679
 680 /* low-level mailbox write */
 681 size_t spu_wbox_write(struct spu_context *ctx, u32 data)
 682 {
 683         return ctx->ops->wbox_write(ctx, data);
 684 }
 685
 686 static int spufs_wbox_fasync(int fd, struct file *file, int on)
 687 {
 688         struct spu_context *ctx = file->private_data;
 689         int ret;
 690
 691         ret = fasync_helper(fd, file, on, &ctx->wbox_fasync);
 692
 693         return ret;
 694 }
 695
 696 /* interrupt-level wbox callback function. */
 697 void spufs_wbox_callback(struct spu *spu)
 698 {
 699         struct spu_context *ctx = spu->ctx;
 700
 701         wake_up_all(&ctx->wbox_wq);
 702         kill_fasync(&ctx->wbox_fasync, SIGIO, POLLOUT);
 703 }
 704
 705 /*
 706  * Write as many bytes to the interrupt mailbox as possible, until
 707  * one of the conditions becomes true:
 708  *
 709  * - the mailbox is full
 710  * - end of the user provided buffer
 711  * - end of the mapped area
 712  *
 713  * If the file is opened without O_NONBLOCK, we wait here until
 714  * space is availabyl, but return when we have been able to
 715  * write something.
 716  */
 717 static ssize_t spufs_wbox_write(struct file *file, const char __user *buf,
 718                         size_t len, loff_t *pos)
 719 {
 720         struct spu_context *ctx = file->private_data;
 721         u32 wbox_data, __user *udata;
 722         ssize_t count;
 723
 724         if (len < 4)
 725                 return -EINVAL;
 726
 727         udata = (void __user *)buf;
 728         if (!access_ok(VERIFY_READ, buf, len))
 729                 return -EFAULT;
 730
 731         if (__get_user(wbox_data, udata))
 732                 return -EFAULT;
 733
 734         spu_acquire(ctx);
 735
 736         /*
 737          * make sure we can at least write one element, by waiting
 738          * in case of !O_NONBLOCK
 739          */
 740         count = 0;
 741         if (file->f_flags & O_NONBLOCK) {
 742                 if (!spu_wbox_write(ctx, wbox_data))
 743                         count = -EAGAIN;
 744         } else {
 745                 count = spufs_wait(ctx->wbox_wq, spu_wbox_write(ctx, wbox_data));
 746         }
 747
 748         if (count)
 749                 goto out;
 750
 751         /* write as much as possible */
 752         for (count = 4, udata++; (count + 4) <= len; count += 4, udata++) {
 753                 int ret;
 754                 ret = __get_user(wbox_data, udata);
 755                 if (ret)
 756                         break;
 757
 758                 ret = spu_wbox_write(ctx, wbox_data);
 759                 if (ret == 0)
 760                         break;
 761         }
 762
 763 out:
 764         spu_release(ctx);
 765         return count;
 766 }
 767
 768 static unsigned int spufs_wbox_poll(struct file *file, poll_table *wait)
 769 {
 770         struct spu_context *ctx = file->private_data;
 771         unsigned int mask;
 772
 773         poll_wait(file, &ctx->wbox_wq, wait);
 774
 775         spu_acquire(ctx);
 776         mask = ctx->ops->mbox_stat_poll(ctx, POLLOUT | POLLWRNORM);
 777         spu_release(ctx);
 778
 779         return mask;
 780 }
 781
 782 static const struct file_operations spufs_wbox_fops = {
 783         .open   = spufs_pipe_open,
 784         .write  = spufs_wbox_write,
 785         .poll   = spufs_wbox_poll,
 786         .fasync = spufs_wbox_fasync,
 787 };
 788
 789 static ssize_t spufs_wbox_stat_read(struct file *file, char __user *buf,
 790                         size_t len, loff_t *pos)
 791 {
 792         struct spu_context *ctx = file->private_data;
 793         u32 wbox_stat;
 794
 795         if (len < 4)
 796                 return -EINVAL;
 797
 798         spu_acquire(ctx);
 799         wbox_stat = (ctx->ops->mbox_stat_read(ctx) >> 8) & 0xff;
 800         spu_release(ctx);
 801
 802         if (copy_to_user(buf, &wbox_stat, sizeof wbox_stat))
 803                 return -EFAULT;
 804
 805         return 4;
 806 }
 807
 808 static const struct file_operations spufs_wbox_stat_fops = {
 809         .open   = spufs_pipe_open,
 810         .read   = spufs_wbox_stat_read,
 811 };
 812
 813 static int spufs_signal1_open(struct inode *inode, struct file *file)
 814 {
 815         struct spufs_inode_info *i = SPUFS_I(inode);
 816         struct spu_context *ctx = i->i_ctx;
 817
 818         mutex_lock(&ctx->mapping_lock);
 819         file->private_data = ctx;
 820         if (!i->i_openers++)
 821                 ctx->signal1 = inode->i_mapping;
 822         mutex_unlock(&ctx->mapping_lock);
 823         return nonseekable_open(inode, file);
 824 }
 825
 826 static int
 827 spufs_signal1_release(struct inode *inode, struct file *file)
 828 {
 829         struct spufs_inode_info *i = SPUFS_I(inode);
 830         struct spu_context *ctx = i->i_ctx;
 831
 832         mutex_lock(&ctx->mapping_lock);
 833         if (!--i->i_openers)
 834                 ctx->signal1 = NULL;
 835         mutex_unlock(&ctx->mapping_lock);
 836         return 0;
 837 }
 838
 839 static ssize_t __spufs_signal1_read(struct spu_context *ctx, char __user *buf,
 840                         size_t len, loff_t *pos)
 841 {
 842         int ret = 0;
 843         u32 data;
 844
 845         if (len < 4)
 846                 return -EINVAL;
 847
 848         if (ctx->csa.spu_chnlcnt_RW[3]) {
 849                 data = ctx->csa.spu_chnldata_RW[3];
 850                 ret = 4;
 851         }
 852
 853         if (!ret)
 854                 goto out;
 855
 856         if (copy_to_user(buf, &data, 4))
 857                 return -EFAULT;
 858
 859 out:
 860         return ret;
 861 }
 862
 863 static ssize_t spufs_signal1_read(struct file *file, char __user *buf,
 864                         size_t len, loff_t *pos)
 865 {
 866         int ret;
 867         struct spu_context *ctx = file->private_data;
 868
 869         spu_acquire_saved(ctx);
 870         ret = __spufs_signal1_read(ctx, buf, len, pos);
 871         spu_release_saved(ctx);
 872
 873         return ret;
 874 }
 875
 876 static ssize_t spufs_signal1_write(struct file *file, const char __user *buf,
 877                         size_t len, loff_t *pos)
 878 {
 879         struct spu_context *ctx;
 880         u32 data;
 881
 882         ctx = file->private_data;
 883
 884         if (len < 4)
 885                 return -EINVAL;
 886
 887         if (copy_from_user(&data, buf, 4))
 888                 return -EFAULT;
 889
 890         spu_acquire(ctx);
 891         ctx->ops->signal1_write(ctx, data);
 892         spu_release(ctx);
 893
 894         return 4;
 895 }
 896
 897 static unsigned long spufs_signal1_mmap_nopfn(struct vm_area_struct *vma,
 898                                               unsigned long address)
 899 {
 900 #if PAGE_SIZE == 0x1000
 901         return spufs_ps_nopfn(vma, address, 0x14000, 0x1000);
 902 #elif PAGE_SIZE == 0x10000
 903         /* For 64k pages, both signal1 and signal2 can be used to mmap the whole
 904          * signal 1 and 2 area
 905          */
 906         return spufs_ps_nopfn(vma, address, 0x10000, 0x10000);
 907 #else
 908 #error unsupported page size
 909 #endif
 910 }
 911
 912 static struct vm_operations_struct spufs_signal1_mmap_vmops = {
 913         .nopfn = spufs_signal1_mmap_nopfn,
 914 };
 915
 916 static int spufs_signal1_mmap(struct file *file, struct vm_area_struct *vma)
 917 {
 918         if (!(vma->vm_flags & VM_SHARED))
 919                 return -EINVAL;
 920
 921         vma->vm_flags |= VM_IO | VM_PFNMAP;
 922         vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
 923                                      | _PAGE_NO_CACHE | _PAGE_GUARDED);
 924
 925         vma->vm_ops = &spufs_signal1_mmap_vmops;
 926         return 0;
 927 }
 928
 929 static const struct file_operations spufs_signal1_fops = {
 930         .open = spufs_signal1_open,
 931         .release = spufs_signal1_release,
 932         .read = spufs_signal1_read,
 933         .write = spufs_signal1_write,
 934         .mmap = spufs_signal1_mmap,
 935 };
 936
 937 static const struct file_operations spufs_signal1_nosched_fops = {
 938         .open = spufs_signal1_open,
 939         .release = spufs_signal1_release,
 940         .write = spufs_signal1_write,
 941         .mmap = spufs_signal1_mmap,
 942 };
 943
 944 static int spufs_signal2_open(struct inode *inode, struct file *file)
 945 {
 946         struct spufs_inode_info *i = SPUFS_I(inode);
 947         struct spu_context *ctx = i->i_ctx;
 948
 949         mutex_lock(&ctx->mapping_lock);
 950         file->private_data = ctx;
 951         if (!i->i_openers++)
 952                 ctx->signal2 = inode->i_mapping;
 953         mutex_unlock(&ctx->mapping_lock);
 954         return nonseekable_open(inode, file);
 955 }
 956
 957 static int
 958 spufs_signal2_release(struct inode *inode, struct file *file)
 959 {
 960         struct spufs_inode_info *i = SPUFS_I(inode);
 961         struct spu_context *ctx = i->i_ctx;
 962
 963         mutex_lock(&ctx->mapping_lock);
 964         if (!--i->i_openers)
 965                 ctx->signal2 = NULL;
 966         mutex_unlock(&ctx->mapping_lock);
 967         return 0;
 968 }
 969
 970 static ssize_t __spufs_signal2_read(struct spu_context *ctx, char __user *buf,
 971                         size_t len, loff_t *pos)
 972 {
 973         int ret = 0;
 974         u32 data;
 975
 976         if (len < 4)
 977                 return -EINVAL;
 978
 979         if (ctx->csa.spu_chnlcnt_RW[4]) {
 980                 data =  ctx->csa.spu_chnldata_RW[4];
 981                 ret = 4;
 982         }
 983
 984         if (!ret)
 985                 goto out;
 986
 987         if (copy_to_user(buf, &data, 4))
 988                 return -EFAULT;
 989
 990 out:
 991         return ret;
 992 }
 993
 994 static ssize_t spufs_signal2_read(struct file *file, char __user *buf,
 995                         size_t len, loff_t *pos)
 996 {
 997         struct spu_context *ctx = file->private_data;
 998         int ret;
 999
1000         spu_acquire_saved(ctx);
1001         ret = __spufs_signal2_read(ctx, buf, len, pos);
1002         spu_release_saved(ctx);
1003
1004         return ret;
1005 }
1006
1007 static ssize_t spufs_signal2_write(struct file *file, const char __user *buf,
1008                         size_t len, loff_t *pos)
1009 {
1010         struct spu_context *ctx;
1011         u32 data;
1012
1013         ctx = file->private_data;
1014
1015         if (len < 4)
1016                 return -EINVAL;
1017
1018         if (copy_from_user(&data, buf, 4))
1019                 return -EFAULT;
1020
1021         spu_acquire(ctx);
1022         ctx->ops->signal2_write(ctx, data);
1023         spu_release(ctx);
1024
1025         return 4;
1026 }
1027
1028 #if SPUFS_MMAP_4K
1029 static unsigned long spufs_signal2_mmap_nopfn(struct vm_area_struct *vma,
1030                                               unsigned long address)
1031 {
1032 #if PAGE_SIZE == 0x1000
1033         return spufs_ps_nopfn(vma, address, 0x1c000, 0x1000);
1034 #elif PAGE_SIZE == 0x10000
1035         /* For 64k pages, both signal1 and signal2 can be used to mmap the whole
1036          * signal 1 and 2 area
1037          */
1038         return spufs_ps_nopfn(vma, address, 0x10000, 0x10000);
1039 #else
1040 #error unsupported page size
1041 #endif
1042 }
1043
1044 static struct vm_operations_struct spufs_signal2_mmap_vmops = {
1045         .nopfn = spufs_signal2_mmap_nopfn,
1046 };
1047
1048 static int spufs_signal2_mmap(struct file *file, struct vm_area_struct *vma)
1049 {
1050         if (!(vma->vm_flags & VM_SHARED))
1051                 return -EINVAL;
1052
1053         vma->vm_flags |= VM_IO | VM_PFNMAP;
1054         vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
1055                                      | _PAGE_NO_CACHE | _PAGE_GUARDED);
1056
1057         vma->vm_ops = &spufs_signal2_mmap_vmops;
1058         return 0;
1059 }
1060 #else /* SPUFS_MMAP_4K */
1061 #define spufs_signal2_mmap NULL
1062 #endif /* !SPUFS_MMAP_4K */
1063
1064 static const struct file_operations spufs_signal2_fops = {
1065         .open = spufs_signal2_open,
1066         .release = spufs_signal2_release,
1067         .read = spufs_signal2_read,
1068         .write = spufs_signal2_write,
1069         .mmap = spufs_signal2_mmap,
1070 };
1071
1072 static const struct file_operations spufs_signal2_nosched_fops = {
1073         .open = spufs_signal2_open,
1074         .release = spufs_signal2_release,
1075         .write = spufs_signal2_write,
1076         .mmap = spufs_signal2_mmap,
1077 };
1078
1079 /*
1080  * This is a wrapper around DEFINE_SIMPLE_ATTRIBUTE which does the
1081  * work of acquiring (or not) the SPU context before calling through
1082  * to the actual get routine. The set routine is called directly.
1083  */
1084 #define SPU_ATTR_NOACQUIRE      0
1085 #define SPU_ATTR_ACQUIRE        1
1086 #define SPU_ATTR_ACQUIRE_SAVED  2
1087
1088 #define DEFINE_SPUFS_ATTRIBUTE(__name, __get, __set, __fmt, __acquire)  \
1089 static u64 __##__get(void *data)                                        \
1090 {                                                                       \
1091         struct spu_context *ctx = data;                                 \
1092         u64 ret;                                                        \
1093                                                                         \
1094         if (__acquire == SPU_ATTR_ACQUIRE) {                            \
1095                 spu_acquire(ctx);                                       \
1096                 ret = __get(ctx);                                       \
1097                 spu_release(ctx);                                       \
1098         } else if (__acquire == SPU_ATTR_ACQUIRE_SAVED) {               \
1099                 spu_acquire_saved(ctx);                                 \
1100                 ret = __get(ctx);                                       \
1101                 spu_release_saved(ctx);                                 \
1102         } else                                                          \
1103                 ret = __get(ctx);                                       \
1104                                                                         \
1105         return ret;                                                     \
1106 }                                                                       \
1107 DEFINE_SIMPLE_ATTRIBUTE(__name, __##__get, __set, __fmt);
1108
1109 static void spufs_signal1_type_set(void *data, u64 val)
1110 {
1111         struct spu_context *ctx = data;
1112
1113         spu_acquire(ctx);
1114         ctx->ops->signal1_type_set(ctx, val);
1115         spu_release(ctx);
1116 }
1117
1118 static u64 spufs_signal1_type_get(struct spu_context *ctx)
1119 {
1120         return ctx->ops->signal1_type_get(ctx);
1121 }
1122 DEFINE_SPUFS_ATTRIBUTE(spufs_signal1_type, spufs_signal1_type_get,
1123                        spufs_signal1_type_set, "%llu", SPU_ATTR_ACQUIRE);
1124
1125
1126 static void spufs_signal2_type_set(void *data, u64 val)
1127 {
1128         struct spu_context *ctx = data;
1129
1130         spu_acquire(ctx);
1131         ctx->ops->signal2_type_set(ctx, val);
1132         spu_release(ctx);
1133 }
1134
1135 static u64 spufs_signal2_type_get(struct spu_context *ctx)
1136 {
1137         return ctx->ops->signal2_type_get(ctx);
1138 }
1139 DEFINE_SPUFS_ATTRIBUTE(spufs_signal2_type, spufs_signal2_type_get,
1140                        spufs_signal2_type_set, "%llu", SPU_ATTR_ACQUIRE);
1141
1142 #if SPUFS_MMAP_4K
1143 static unsigned long spufs_mss_mmap_nopfn(struct vm_area_struct *vma,
1144                                           unsigned long address)
1145 {
1146         return spufs_ps_nopfn(vma, address, 0x0000, 0x1000);
1147 }
1148
1149 static struct vm_operations_struct spufs_mss_mmap_vmops = {
1150         .nopfn = spufs_mss_mmap_nopfn,
1151 };
1152
1153 /*
1154  * mmap support for problem state MFC DMA area [0x0000 - 0x0fff].
1155  */
1156 static int spufs_mss_mmap(struct file *file, struct vm_area_struct *vma)
1157 {
1158         if (!(vma->vm_flags & VM_SHARED))
1159                 return -EINVAL;
1160
1161         vma->vm_flags |= VM_IO | VM_PFNMAP;
1162         vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
1163                                      | _PAGE_NO_CACHE | _PAGE_GUARDED);
1164
1165         vma->vm_ops = &spufs_mss_mmap_vmops;
1166         return 0;
1167 }
1168 #else /* SPUFS_MMAP_4K */
1169 #define spufs_mss_mmap NULL
1170 #endif /* !SPUFS_MMAP_4K */
1171
1172 static int spufs_mss_open(struct inode *inode, struct file *file)
1173 {
1174         struct spufs_inode_info *i = SPUFS_I(inode);
1175         struct spu_context *ctx = i->i_ctx;
1176
1177         file->private_data = i->i_ctx;
1178
1179         mutex_lock(&ctx->mapping_lock);
1180         if (!i->i_openers++)
1181                 ctx->mss = inode->i_mapping;
1182         mutex_unlock(&ctx->mapping_lock);
1183         return nonseekable_open(inode, file);
1184 }
1185
1186 static int
1187 spufs_mss_release(struct inode *inode, struct file *file)
1188 {
1189         struct spufs_inode_info *i = SPUFS_I(inode);
1190         struct spu_context *ctx = i->i_ctx;
1191
1192         mutex_lock(&ctx->mapping_lock);
1193         if (!--i->i_openers)
1194                 ctx->mss = NULL;
1195         mutex_unlock(&ctx->mapping_lock);
1196         return 0;
1197 }
1198
1199 static const struct file_operations spufs_mss_fops = {
1200         .open    = spufs_mss_open,
1201         .release = spufs_mss_release,
1202         .mmap    = spufs_mss_mmap,
1203 };
1204
1205 static unsigned long spufs_psmap_mmap_nopfn(struct vm_area_struct *vma,
1206                                             unsigned long address)
1207 {
1208         return spufs_ps_nopfn(vma, address, 0x0000, 0x20000);
1209 }
1210
1211 static struct vm_operations_struct spufs_psmap_mmap_vmops = {
1212         .nopfn = spufs_psmap_mmap_nopfn,
1213 };
1214
1215 /*
1216  * mmap support for full problem state area [0x00000 - 0x1ffff].
1217  */
1218 static int spufs_psmap_mmap(struct file *file, struct vm_area_struct *vma)
1219 {
1220         if (!(vma->vm_flags & VM_SHARED))
1221                 return -EINVAL;
1222
1223         vma->vm_flags |= VM_IO | VM_PFNMAP;
1224         vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
1225                                      | _PAGE_NO_CACHE | _PAGE_GUARDED);
1226
1227         vma->vm_ops = &spufs_psmap_mmap_vmops;
1228         return 0;
1229 }
1230
1231 static int spufs_psmap_open(struct inode *inode, struct file *file)
1232 {
1233         struct spufs_inode_info *i = SPUFS_I(inode);
1234         struct spu_context *ctx = i->i_ctx;
1235
1236         mutex_lock(&ctx->mapping_lock);
1237         file->private_data = i->i_ctx;
1238         if (!i->i_openers++)
1239                 ctx->psmap = inode->i_mapping;
1240         mutex_unlock(&ctx->mapping_lock);
1241         return nonseekable_open(inode, file);
1242 }
1243
1244 static int
1245 spufs_psmap_release(struct inode *inode, struct file *file)
1246 {
1247         struct spufs_inode_info *i = SPUFS_I(inode);
1248         struct spu_context *ctx = i->i_ctx;
1249
1250         mutex_lock(&ctx->mapping_lock);
1251         if (!--i->i_openers)
1252                 ctx->psmap = NULL;
1253         mutex_unlock(&ctx->mapping_lock);
1254         return 0;
1255 }
1256
1257 static const struct file_operations spufs_psmap_fops = {
1258         .open    = spufs_psmap_open,
1259         .release = spufs_psmap_release,
1260         .mmap    = spufs_psmap_mmap,
1261 };
1262
1263
1264 #if SPUFS_MMAP_4K
1265 static unsigned long spufs_mfc_mmap_nopfn(struct vm_area_struct *vma,
1266                                           unsigned long address)
1267 {
1268         return spufs_ps_nopfn(vma, address, 0x3000, 0x1000);
1269 }
1270
1271 static struct vm_operations_struct spufs_mfc_mmap_vmops = {
1272         .nopfn = spufs_mfc_mmap_nopfn,
1273 };
1274
1275 /*
1276  * mmap support for problem state MFC DMA area [0x0000 - 0x0fff].
1277  */
1278 static int spufs_mfc_mmap(struct file *file, struct vm_area_struct *vma)
1279 {
1280         if (!(vma->vm_flags & VM_SHARED))
1281                 return -EINVAL;
1282
1283         vma->vm_flags |= VM_IO | VM_PFNMAP;
1284         vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
1285                                      | _PAGE_NO_CACHE | _PAGE_GUARDED);
1286
1287         vma->vm_ops = &spufs_mfc_mmap_vmops;
1288         return 0;
1289 }
1290 #else /* SPUFS_MMAP_4K */
1291 #define spufs_mfc_mmap NULL
1292 #endif /* !SPUFS_MMAP_4K */
1293
1294 static int spufs_mfc_open(struct inode *inode, struct file *file)
1295 {
1296         struct spufs_inode_info *i = SPUFS_I(inode);
1297         struct spu_context *ctx = i->i_ctx;
1298
1299         /* we don't want to deal with DMA into other processes */
1300         if (ctx->owner != current->mm)
1301                 return -EINVAL;
1302
1303         if (atomic_read(&inode->i_count) != 1)
1304                 return -EBUSY;
1305
1306         mutex_lock(&ctx->mapping_lock);
1307         file->private_data = ctx;
1308         if (!i->i_openers++)
1309                 ctx->mfc = inode->i_mapping;
1310         mutex_unlock(&ctx->mapping_lock);
1311         return nonseekable_open(inode, file);
1312 }
1313
1314 static int
1315 spufs_mfc_release(struct inode *inode, struct file *file)
1316 {
1317         struct spufs_inode_info *i = SPUFS_I(inode);
1318         struct spu_context *ctx = i->i_ctx;
1319
1320         mutex_lock(&ctx->mapping_lock);
1321         if (!--i->i_openers)
1322                 ctx->mfc = NULL;
1323         mutex_unlock(&ctx->mapping_lock);
1324         return 0;
1325 }
1326
1327 /* interrupt-level mfc callback function. */
1328 void spufs_mfc_callback(struct spu *spu)
1329 {
1330         struct spu_context *ctx = spu->ctx;
1331
1332         wake_up_all(&ctx->mfc_wq);
1333
1334         pr_debug("%s %s\n", __FUNCTION__, spu->name);
1335         if (ctx->mfc_fasync) {
1336                 u32 free_elements, tagstatus;
1337                 unsigned int mask;
1338
1339                 /* no need for spu_acquire in interrupt context */
1340                 free_elements = ctx->ops->get_mfc_free_elements(ctx);
1341                 tagstatus = ctx->ops->read_mfc_tagstatus(ctx);
1342
1343                 mask = 0;
1344                 if (free_elements & 0xffff)
1345                         mask |= POLLOUT;
1346                 if (tagstatus & ctx->tagwait)
1347                         mask |= POLLIN;
1348
1349                 kill_fasync(&ctx->mfc_fasync, SIGIO, mask);
1350         }
1351 }
1352
1353 static int spufs_read_mfc_tagstatus(struct spu_context *ctx, u32 *status)
1354 {
1355         /* See if there is one tag group is complete */
1356         /* FIXME we need locking around tagwait */
1357         *status = ctx->ops->read_mfc_tagstatus(ctx) & ctx->tagwait;
1358         ctx->tagwait &= ~*status;
1359         if (*status)
1360                 return 1;
1361
1362         /* enable interrupt waiting for any tag group,
1363            may silently fail if interrupts are already enabled */
1364         ctx->ops->set_mfc_query(ctx, ctx->tagwait, 1);
1365         return 0;
1366 }
1367
1368 static ssize_t spufs_mfc_read(struct file *file, char __user *buffer,
1369                         size_t size, loff_t *pos)
1370 {
1371         struct spu_context *ctx = file->private_data;
1372         int ret = -EINVAL;
1373         u32 status;
1374
1375         if (size != 4)
1376                 goto out;
1377
1378         spu_acquire(ctx);
1379         if (file->f_flags & O_NONBLOCK) {
1380                 status = ctx->ops->read_mfc_tagstatus(ctx);
1381                 if (!(status & ctx->tagwait))
1382                         ret = -EAGAIN;
1383                 else
1384                         ctx->tagwait &= ~status;
1385         } else {
1386                 ret = spufs_wait(ctx->mfc_wq,
1387                            spufs_read_mfc_tagstatus(ctx, &status));
1388         }
1389         spu_release(ctx);
1390
1391         if (ret)
1392                 goto out;
1393
1394         ret = 4;
1395         if (copy_to_user(buffer, &status, 4))
1396                 ret = -EFAULT;
1397
1398 out:
1399         return ret;
1400 }
1401
1402 static int spufs_check_valid_dma(struct mfc_dma_command *cmd)
1403 {
1404         pr_debug("queueing DMA %x %lx %x %x %x\n", cmd->lsa,
1405                  cmd->ea, cmd->size, cmd->tag, cmd->cmd);
1406
1407         switch (cmd->cmd) {
1408         case MFC_PUT_CMD:
1409         case MFC_PUTF_CMD:
1410         case MFC_PUTB_CMD:
1411         case MFC_GET_CMD:
1412         case MFC_GETF_CMD:
1413         case MFC_GETB_CMD:
1414                 break;
1415         default:
1416                 pr_debug("invalid DMA opcode %x\n", cmd->cmd);
1417                 return -EIO;
1418         }
1419
1420         if ((cmd->lsa & 0xf) != (cmd->ea &0xf)) {
1421                 pr_debug("invalid DMA alignment, ea %lx lsa %x\n",
1422                                 cmd->ea, cmd->lsa);
1423                 return -EIO;
1424         }
1425
1426         switch (cmd->size & 0xf) {
1427         case 1:
1428                 break;
1429         case 2:
1430                 if (cmd->lsa & 1)
1431                         goto error;
1432                 break;
1433         case 4:
1434                 if (cmd->lsa & 3)
1435                         goto error;
1436                 break;
1437         case 8:
1438                 if (cmd->lsa & 7)
1439                         goto error;
1440                 break;
1441         case 0:
1442                 if (cmd->lsa & 15)
1443                         goto error;
1444                 break;
1445         error:
1446         default:
1447                 pr_debug("invalid DMA alignment %x for size %x\n",
1448                         cmd->lsa & 0xf, cmd->size);
1449                 return -EIO;
1450         }
1451
1452         if (cmd->size > 16 * 1024) {
1453                 pr_debug("invalid DMA size %x\n", cmd->size);
1454                 return -EIO;
1455         }
1456
1457         if (cmd->tag & 0xfff0) {
1458                 /* we reserve the higher tag numbers for kernel use */
1459                 pr_debug("invalid DMA tag\n");
1460                 return -EIO;
1461         }
1462
1463         if (cmd->class) {
1464                 /* not supported in this version */
1465                 pr_debug("invalid DMA class\n");
1466                 return -EIO;
1467         }
1468
1469         return 0;
1470 }
1471
1472 static int spu_send_mfc_command(struct spu_context *ctx,
1473                                 struct mfc_dma_command cmd,
1474                                 int *error)
1475 {
1476         *error = ctx->ops->send_mfc_command(ctx, &cmd);
1477         if (*error == -EAGAIN) {
1478                 /* wait for any tag group to complete
1479                    so we have space for the new command */
1480                 ctx->ops->set_mfc_query(ctx, ctx->tagwait, 1);
1481                 /* try again, because the queue might be
1482                    empty again */
1483                 *error = ctx->ops->send_mfc_command(ctx, &cmd);
1484                 if (*error == -EAGAIN)
1485                         return 0;
1486         }
1487         return 1;
1488 }
1489
1490 static ssize_t spufs_mfc_write(struct file *file, const char __user *buffer,
1491                         size_t size, loff_t *pos)
1492 {
1493         struct spu_context *ctx = file->private_data;
1494         struct mfc_dma_command cmd;
1495         int ret = -EINVAL;
1496
1497         if (size != sizeof cmd)
1498                 goto out;
1499
1500         ret = -EFAULT;
1501         if (copy_from_user(&cmd, buffer, sizeof cmd))
1502                 goto out;
1503
1504         ret = spufs_check_valid_dma(&cmd);
1505         if (ret)
1506                 goto out;
1507
1508         ret = spu_acquire_runnable(ctx, 0);
1509         if (ret)
1510                 goto out;
1511
1512         if (file->f_flags & O_NONBLOCK) {
1513                 ret = ctx->ops->send_mfc_command(ctx, &cmd);
1514         } else {
1515                 int status;
1516                 ret = spufs_wait(ctx->mfc_wq,
1517                                  spu_send_mfc_command(ctx, cmd, &status));
1518                 if (status)
1519                         ret = status;
1520         }
1521
1522         if (ret)
1523                 goto out_unlock;
1524
1525         ctx->tagwait |= 1 << cmd.tag;
1526         ret = size;
1527
1528 out_unlock:
1529         spu_release(ctx);
1530 out:
1531         return ret;
1532 }
1533
1534 static unsigned int spufs_mfc_poll(struct file *file,poll_table *wait)
1535 {
1536         struct spu_context *ctx = file->private_data;
1537         u32 free_elements, tagstatus;
1538         unsigned int mask;
1539
1540         poll_wait(file, &ctx->mfc_wq, wait);
1541
1542         spu_acquire(ctx);
1543         ctx->ops->set_mfc_query(ctx, ctx->tagwait, 2);
1544         free_elements = ctx->ops->get_mfc_free_elements(ctx);
1545         tagstatus = ctx->ops->read_mfc_tagstatus(ctx);
1546         spu_release(ctx);
1547
1548         mask = 0;
1549         if (free_elements & 0xffff)
1550                 mask |= POLLOUT | POLLWRNORM;
1551         if (tagstatus & ctx->tagwait)
1552                 mask |= POLLIN | POLLRDNORM;
1553
1554         pr_debug("%s: free %d tagstatus %d tagwait %d\n", __FUNCTION__,
1555                 free_elements, tagstatus, ctx->tagwait);
1556
1557         return mask;
1558 }
1559
1560 static int spufs_mfc_flush(struct file *file, fl_owner_t id)
1561 {
1562         struct spu_context *ctx = file->private_data;
1563         int ret;
1564
1565         spu_acquire(ctx);
1566 #if 0
1567 /* this currently hangs */
1568         ret = spufs_wait(ctx->mfc_wq,
1569                          ctx->ops->set_mfc_query(ctx, ctx->tagwait, 2));
1570         if (ret)
1571                 goto out;
1572         ret = spufs_wait(ctx->mfc_wq,
1573                          ctx->ops->read_mfc_tagstatus(ctx) == ctx->tagwait);
1574 out:
1575 #else
1576         ret = 0;
1577 #endif
1578         spu_release(ctx);
1579
1580         return ret;
1581 }
1582
1583 static int spufs_mfc_fsync(struct file *file, struct dentry *dentry,
1584                            int datasync)
1585 {
1586         return spufs_mfc_flush(file, NULL);
1587 }
1588
1589 static int spufs_mfc_fasync(int fd, struct file *file, int on)
1590 {
1591         struct spu_context *ctx = file->private_data;
1592
1593         return fasync_helper(fd, file, on, &ctx->mfc_fasync);
1594 }
1595
1596 static const struct file_operations spufs_mfc_fops = {
1597         .open    = spufs_mfc_open,
1598         .release = spufs_mfc_release,
1599         .read    = spufs_mfc_read,
1600         .write   = spufs_mfc_write,
1601         .poll    = spufs_mfc_poll,
1602         .flush   = spufs_mfc_flush,
1603         .fsync   = spufs_mfc_fsync,
1604         .fasync  = spufs_mfc_fasync,
1605         .mmap    = spufs_mfc_mmap,
1606 };
1607
1608 static void spufs_npc_set(void *data, u64 val)
1609 {
1610         struct spu_context *ctx = data;
1611         spu_acquire(ctx);
1612         ctx->ops->npc_write(ctx, val);
1613         spu_release(ctx);
1614 }
1615
1616 static u64 spufs_npc_get(struct spu_context *ctx)
1617 {
1618         return ctx->ops->npc_read(ctx);
1619 }
1620 DEFINE_SPUFS_ATTRIBUTE(spufs_npc_ops, spufs_npc_get, spufs_npc_set,
1621                        "0x%llx\n", SPU_ATTR_ACQUIRE);
1622
1623 static void spufs_decr_set(void *data, u64 val)
1624 {
1625         struct spu_context *ctx = data;
1626         struct spu_lscsa *lscsa = ctx->csa.lscsa;
1627         spu_acquire_saved(ctx);
1628         lscsa->decr.slot[0] = (u32) val;
1629         spu_release_saved(ctx);
1630 }
1631
1632 static u64 spufs_decr_get(struct spu_context *ctx)
1633 {
1634         struct spu_lscsa *lscsa = ctx->csa.lscsa;
1635         return lscsa->decr.slot[0];
1636 }
1637 DEFINE_SPUFS_ATTRIBUTE(spufs_decr_ops, spufs_decr_get, spufs_decr_set,
1638                        "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED);
1639
1640 static void spufs_decr_status_set(void *data, u64 val)
1641 {
1642         struct spu_context *ctx = data;
1643         spu_acquire_saved(ctx);
1644         if (val)
1645                 ctx->csa.priv2.mfc_control_RW |= MFC_CNTL_DECREMENTER_RUNNING;
1646         else
1647                 ctx->csa.priv2.mfc_control_RW &= ~MFC_CNTL_DECREMENTER_RUNNING;
1648         spu_release_saved(ctx);
1649 }
1650
1651 static u64 spufs_decr_status_get(struct spu_context *ctx)
1652 {
1653         if (ctx->csa.priv2.mfc_control_RW & MFC_CNTL_DECREMENTER_RUNNING)
1654                 return SPU_DECR_STATUS_RUNNING;
1655         else
1656                 return 0;
1657 }
1658 DEFINE_SPUFS_ATTRIBUTE(spufs_decr_status_ops, spufs_decr_status_get,
1659                        spufs_decr_status_set, "0x%llx\n",
1660                        SPU_ATTR_ACQUIRE_SAVED);
1661
1662 static void spufs_event_mask_set(void *data, u64 val)
1663 {
1664         struct spu_context *ctx = data;
1665         struct spu_lscsa *lscsa = ctx->csa.lscsa;
1666         spu_acquire_saved(ctx);
1667         lscsa->event_mask.slot[0] = (u32) val;
1668         spu_release_saved(ctx);
1669 }
1670
1671 static u64 spufs_event_mask_get(struct spu_context *ctx)
1672 {
1673         struct spu_lscsa *lscsa = ctx->csa.lscsa;
1674         return lscsa->event_mask.slot[0];
1675 }
1676
1677 DEFINE_SPUFS_ATTRIBUTE(spufs_event_mask_ops, spufs_event_mask_get,
1678                        spufs_event_mask_set, "0x%llx\n",
1679                        SPU_ATTR_ACQUIRE_SAVED);
1680
1681 static u64 spufs_event_status_get(struct spu_context *ctx)
1682 {
1683         struct spu_state *state = &ctx->csa;
1684         u64 stat;
1685         stat = state->spu_chnlcnt_RW[0];
1686         if (stat)
1687                 return state->spu_chnldata_RW[0];
1688         return 0;
1689 }
1690 DEFINE_SPUFS_ATTRIBUTE(spufs_event_status_ops, spufs_event_status_get,
1691                        NULL, "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED)
1692
1693 static void spufs_srr0_set(void *data, u64 val)
1694 {
1695         struct spu_context *ctx = data;
1696         struct spu_lscsa *lscsa = ctx->csa.lscsa;
1697         spu_acquire_saved(ctx);
1698         lscsa->srr0.slot[0] = (u32) val;
1699         spu_release_saved(ctx);
1700 }
1701
1702 static u64 spufs_srr0_get(struct spu_context *ctx)
1703 {
1704         struct spu_lscsa *lscsa = ctx->csa.lscsa;
1705         return lscsa->srr0.slot[0];
1706 }
1707 DEFINE_SPUFS_ATTRIBUTE(spufs_srr0_ops, spufs_srr0_get, spufs_srr0_set,
1708                        "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED)
1709
1710 static u64 spufs_id_get(struct spu_context *ctx)
1711 {
1712         u64 num;
1713
1714         if (ctx->state == SPU_STATE_RUNNABLE)
1715                 num = ctx->spu->number;
1716         else
1717                 num = (unsigned int)-1;
1718
1719         return num;
1720 }
1721 DEFINE_SPUFS_ATTRIBUTE(spufs_id_ops, spufs_id_get, NULL, "0x%llx\n",
1722                        SPU_ATTR_ACQUIRE)
1723
1724 static u64 spufs_object_id_get(struct spu_context *ctx)
1725 {
1726         /* FIXME: Should there really be no locking here? */
1727         return ctx->object_id;
1728 }
1729
1730 static void spufs_object_id_set(void *data, u64 id)
1731 {
1732         struct spu_context *ctx = data;
1733         ctx->object_id = id;
1734 }
1735
1736 DEFINE_SPUFS_ATTRIBUTE(spufs_object_id_ops, spufs_object_id_get,
1737                        spufs_object_id_set, "0x%llx\n", SPU_ATTR_NOACQUIRE);
1738
1739 static u64 spufs_lslr_get(struct spu_context *ctx)
1740 {
1741         return ctx->csa.priv2.spu_lslr_RW;
1742 }
1743 DEFINE_SPUFS_ATTRIBUTE(spufs_lslr_ops, spufs_lslr_get, NULL, "0x%llx\n",
1744                        SPU_ATTR_ACQUIRE_SAVED);
1745
1746 static int spufs_info_open(struct inode *inode, struct file *file)
1747 {
1748         struct spufs_inode_info *i = SPUFS_I(inode);
1749         struct spu_context *ctx = i->i_ctx;
1750         file->private_data = ctx;
1751         return 0;
1752 }
1753
1754 static int spufs_caps_show(struct seq_file *s, void *private)
1755 {
1756         struct spu_context *ctx = s->private;
1757
1758         if (!(ctx->flags & SPU_CREATE_NOSCHED))
1759                 seq_puts(s, "sched\n");
1760         if (!(ctx->flags & SPU_CREATE_ISOLATE))
1761                 seq_puts(s, "step\n");
1762         return 0;
1763 }
1764
1765 static int spufs_caps_open(struct inode *inode, struct file *file)
1766 {
1767         return single_open(file, spufs_caps_show, SPUFS_I(inode)->i_ctx);
1768 }
1769
1770 static const struct file_operations spufs_caps_fops = {
1771         .open           = spufs_caps_open,
1772         .read           = seq_read,
1773         .llseek         = seq_lseek,
1774         .release        = single_release,
1775 };
1776
1777 static ssize_t __spufs_mbox_info_read(struct spu_context *ctx,
1778                         char __user *buf, size_t len, loff_t *pos)
1779 {
1780         u32 mbox_stat;
1781         u32 data;
1782
1783         mbox_stat = ctx->csa.prob.mb_stat_R;
1784         if (mbox_stat & 0x0000ff) {
1785                 data = ctx->csa.prob.pu_mb_R;
1786         }
1787
1788         return simple_read_from_buffer(buf, len, pos, &data, sizeof data);
1789 }
1790
1791 static ssize_t spufs_mbox_info_read(struct file *file, char __user *buf,
1792                                    size_t len, loff_t *pos)
1793 {
1794         int ret;
1795         struct spu_context *ctx = file->private_data;
1796
1797         if (!access_ok(VERIFY_WRITE, buf, len))
1798                 return -EFAULT;
1799
1800         spu_acquire_saved(ctx);
1801         spin_lock(&ctx->csa.register_lock);
1802         ret = __spufs_mbox_info_read(ctx, buf, len, pos);
1803         spin_unlock(&ctx->csa.register_lock);
1804         spu_release_saved(ctx);
1805
1806         return ret;
1807 }
1808
1809 static const struct file_operations spufs_mbox_info_fops = {
1810         .open = spufs_info_open,
1811         .read = spufs_mbox_info_read,
1812         .llseek  = generic_file_llseek,
1813 };
1814
1815 static ssize_t __spufs_ibox_info_read(struct spu_context *ctx,
1816                                 char __user *buf, size_t len, loff_t *pos)
1817 {
1818         u32 ibox_stat;
1819         u32 data;
1820
1821         ibox_stat = ctx->csa.prob.mb_stat_R;
1822         if (ibox_stat & 0xff0000) {
1823                 data = ctx->csa.priv2.puint_mb_R;
1824         }
1825
1826         return simple_read_from_buffer(buf, len, pos, &data, sizeof data);
1827 }
1828
1829 static ssize_t spufs_ibox_info_read(struct file *file, char __user *buf,
1830                                    size_t len, loff_t *pos)
1831 {
1832         struct spu_context *ctx = file->private_data;
1833         int ret;
1834
1835         if (!access_ok(VERIFY_WRITE, buf, len))
1836                 return -EFAULT;
1837
1838         spu_acquire_saved(ctx);
1839         spin_lock(&ctx->csa.register_lock);
1840         ret = __spufs_ibox_info_read(ctx, buf, len, pos);
1841         spin_unlock(&ctx->csa.register_lock);
1842         spu_release_saved(ctx);
1843
1844         return ret;
1845 }
1846
1847 static const struct file_operations spufs_ibox_info_fops = {
1848         .open = spufs_info_open,
1849         .read = spufs_ibox_info_read,
1850         .llseek  = generic_file_llseek,
1851 };
1852
1853 static ssize_t __spufs_wbox_info_read(struct spu_context *ctx,
1854                         char __user *buf, size_t len, loff_t *pos)
1855 {
1856         int i, cnt;
1857         u32 data[4];
1858         u32 wbox_stat;
1859
1860         wbox_stat = ctx->csa.prob.mb_stat_R;
1861         cnt = 4 - ((wbox_stat & 0x00ff00) >> 8);
1862         for (i = 0; i < cnt; i++) {
1863                 data[i] = ctx->csa.spu_mailbox_data[i];
1864         }
1865
1866         return simple_read_from_buffer(buf, len, pos, &data,
1867                                 cnt * sizeof(u32));
1868 }
1869
1870 static ssize_t spufs_wbox_info_read(struct file *file, char __user *buf,
1871                                    size_t len, loff_t *pos)
1872 {
1873         struct spu_context *ctx = file->private_data;
1874         int ret;
1875
1876         if (!access_ok(VERIFY_WRITE, buf, len))
1877                 return -EFAULT;
1878
1879         spu_acquire_saved(ctx);
1880         spin_lock(&ctx->csa.register_lock);
1881         ret = __spufs_wbox_info_read(ctx, buf, len, pos);
1882         spin_unlock(&ctx->csa.register_lock);
1883         spu_release_saved(ctx);
1884
1885         return ret;
1886 }
1887
1888 static const struct file_operations spufs_wbox_info_fops = {
1889         .open = spufs_info_open,
1890         .read = spufs_wbox_info_read,
1891         .llseek  = generic_file_llseek,
1892 };
1893
1894 static ssize_t __spufs_dma_info_read(struct spu_context *ctx,
1895                         char __user *buf, size_t len, loff_t *pos)
1896 {
1897         struct spu_dma_info info;
1898         struct mfc_cq_sr *qp, *spuqp;
1899         int i;
1900
1901         info.dma_info_type = ctx->csa.priv2.spu_tag_status_query_RW;
1902         info.dma_info_mask = ctx->csa.lscsa->tag_mask.slot[0];
1903         info.dma_info_status = ctx->csa.spu_chnldata_RW[24];
1904         info.dma_info_stall_and_notify = ctx->csa.spu_chnldata_RW[25];
1905         info.dma_info_atomic_command_status = ctx->csa.spu_chnldata_RW[27];
1906         for (i = 0; i < 16; i++) {
1907                 qp = &info.dma_info_command_data[i];
1908                 spuqp = &ctx->csa.priv2.spuq[i];
1909
1910                 qp->mfc_cq_data0_RW = spuqp->mfc_cq_data0_RW;
1911                 qp->mfc_cq_data1_RW = spuqp->mfc_cq_data1_RW;
1912                 qp->mfc_cq_data2_RW = spuqp->mfc_cq_data2_RW;
1913                 qp->mfc_cq_data3_RW = spuqp->mfc_cq_data3_RW;
1914         }
1915
1916         return simple_read_from_buffer(buf, len, pos, &info,
1917                                 sizeof info);
1918 }
1919
1920 static ssize_t spufs_dma_info_read(struct file *file, char __user *buf,
1921                               size_t len, loff_t *pos)
1922 {
1923         struct spu_context *ctx = file->private_data;
1924         int ret;
1925
1926         if (!access_ok(VERIFY_WRITE, buf, len))
1927                 return -EFAULT;
1928
1929         spu_acquire_saved(ctx);
1930         spin_lock(&ctx->csa.register_lock);
1931         ret = __spufs_dma_info_read(ctx, buf, len, pos);
1932         spin_unlock(&ctx->csa.register_lock);
1933         spu_release_saved(ctx);
1934
1935         return ret;
1936 }
1937
1938 static const struct file_operations spufs_dma_info_fops = {
1939         .open = spufs_info_open,
1940         .read = spufs_dma_info_read,
1941 };
1942
1943 static ssize_t __spufs_proxydma_info_read(struct spu_context *ctx,
1944                         char __user *buf, size_t len, loff_t *pos)
1945 {
1946         struct spu_proxydma_info info;
1947         struct mfc_cq_sr *qp, *puqp;
1948         int ret = sizeof info;
1949         int i;
1950
1951         if (len < ret)
1952                 return -EINVAL;
1953
1954         if (!access_ok(VERIFY_WRITE, buf, len))
1955                 return -EFAULT;
1956
1957         info.proxydma_info_type = ctx->csa.prob.dma_querytype_RW;
1958         info.proxydma_info_mask = ctx->csa.prob.dma_querymask_RW;
1959         info.proxydma_info_status = ctx->csa.prob.dma_tagstatus_R;
1960         for (i = 0; i < 8; i++) {
1961                 qp = &info.proxydma_info_command_data[i];
1962                 puqp = &ctx->csa.priv2.puq[i];
1963
1964                 qp->mfc_cq_data0_RW = puqp->mfc_cq_data0_RW;
1965                 qp->mfc_cq_data1_RW = puqp->mfc_cq_data1_RW;
1966                 qp->mfc_cq_data2_RW = puqp->mfc_cq_data2_RW;
1967                 qp->mfc_cq_data3_RW = puqp->mfc_cq_data3_RW;
1968         }
1969
1970         return simple_read_from_buffer(buf, len, pos, &info,
1971                                 sizeof info);
1972 }
1973
1974 static ssize_t spufs_proxydma_info_read(struct file *file, char __user *buf,
1975                                    size_t len, loff_t *pos)
1976 {
1977         struct spu_context *ctx = file->private_data;
1978         int ret;
1979
1980         spu_acquire_saved(ctx);
1981         spin_lock(&ctx->csa.register_lock);
1982         ret = __spufs_proxydma_info_read(ctx, buf, len, pos);
1983         spin_unlock(&ctx->csa.register_lock);
1984         spu_release_saved(ctx);
1985
1986         return ret;
1987 }
1988
1989 static const struct file_operations spufs_proxydma_info_fops = {
1990         .open = spufs_info_open,
1991         .read = spufs_proxydma_info_read,
1992 };
1993
1994 static int spufs_show_tid(struct seq_file *s, void *private)
1995 {
1996         struct spu_context *ctx = s->private;
1997
1998         seq_printf(s, "%d\n", ctx->tid);
1999         return 0;
2000 }
2001
2002 static int spufs_tid_open(struct inode *inode, struct file *file)
2003 {
2004         return single_open(file, spufs_show_tid, SPUFS_I(inode)->i_ctx);
2005 }
2006
2007 static const struct file_operations spufs_tid_fops = {
2008         .open           = spufs_tid_open,
2009         .read           = seq_read,
2010         .llseek         = seq_lseek,
2011         .release        = single_release,
2012 };
2013
2014 static const char *ctx_state_names[] = {
2015         "user", "system", "iowait", "loaded"
2016 };
2017
2018 static unsigned long long spufs_acct_time(struct spu_context *ctx,
2019                 enum spu_utilization_state state)
2020 {
2021         struct timespec ts;
2022         unsigned long long time = ctx->stats.times[state];
2023
2024         /*
2025          * In general, utilization statistics are updated by the controlling
2026          * thread as the spu context moves through various well defined
2027          * state transitions, but if the context is lazily loaded its
2028          * utilization statistics are not updated as the controlling thread
2029          * is not tightly coupled with the execution of the spu context.  We
2030          * calculate and apply the time delta from the last recorded state
2031          * of the spu context.
2032          */
2033         if (ctx->spu && ctx->stats.util_state == state) {
2034                 ktime_get_ts(&ts);
2035                 time += timespec_to_ns(&ts) - ctx->stats.tstamp;
2036         }
2037
2038         return time / NSEC_PER_MSEC;
2039 }
2040
2041 static unsigned long long spufs_slb_flts(struct spu_context *ctx)
2042 {
2043         unsigned long long slb_flts = ctx->stats.slb_flt;
2044
2045         if (ctx->state == SPU_STATE_RUNNABLE) {
2046                 slb_flts += (ctx->spu->stats.slb_flt -
2047                              ctx->stats.slb_flt_base);
2048         }
2049
2050         return slb_flts;
2051 }
2052
2053 static unsigned long long spufs_class2_intrs(struct spu_context *ctx)
2054 {
2055         unsigned long long class2_intrs = ctx->stats.class2_intr;
2056
2057         if (ctx->state == SPU_STATE_RUNNABLE) {
2058                 class2_intrs += (ctx->spu->stats.class2_intr -
2059                                  ctx->stats.class2_intr_base);
2060         }
2061
2062         return class2_intrs;
2063 }
2064
2065
2066 static int spufs_show_stat(struct seq_file *s, void *private)
2067 {
2068         struct spu_context *ctx = s->private;
2069
2070         spu_acquire(ctx);
2071         seq_printf(s, "%s %llu %llu %llu %llu "
2072                       "%llu %llu %llu %llu %llu %llu %llu %llu\n",
2073                 ctx_state_names[ctx->stats.util_state],
2074                 spufs_acct_time(ctx, SPU_UTIL_USER),
2075                 spufs_acct_time(ctx, SPU_UTIL_SYSTEM),
2076                 spufs_acct_time(ctx, SPU_UTIL_IOWAIT),
2077                 spufs_acct_time(ctx, SPU_UTIL_IDLE_LOADED),
2078                 ctx->stats.vol_ctx_switch,
2079                 ctx->stats.invol_ctx_switch,
2080                 spufs_slb_flts(ctx),
2081                 ctx->stats.hash_flt,
2082                 ctx->stats.min_flt,
2083                 ctx->stats.maj_flt,
2084                 spufs_class2_intrs(ctx),
2085                 ctx->stats.libassist);
2086         spu_release(ctx);
2087         return 0;
2088 }
2089
2090 static int spufs_stat_open(struct inode *inode, struct file *file)
2091 {
2092         return single_open(file, spufs_show_stat, SPUFS_I(inode)->i_ctx);
2093 }
2094
2095 static const struct file_operations spufs_stat_fops = {
2096         .open           = spufs_stat_open,
2097         .read           = seq_read,
2098         .llseek         = seq_lseek,
2099         .release        = single_release,
2100 };
2101
2102
2103 struct tree_descr spufs_dir_contents[] = {
2104         { "capabilities", &spufs_caps_fops, 0444, },
2105         { "mem",  &spufs_mem_fops,  0666, },
2106         { "regs", &spufs_regs_fops,  0666, },
2107         { "mbox", &spufs_mbox_fops, 0444, },
2108         { "ibox", &spufs_ibox_fops, 0444, },
2109         { "wbox", &spufs_wbox_fops, 0222, },
2110         { "mbox_stat", &spufs_mbox_stat_fops, 0444, },
2111         { "ibox_stat", &spufs_ibox_stat_fops, 0444, },
2112         { "wbox_stat", &spufs_wbox_stat_fops, 0444, },
2113         { "signal1", &spufs_signal1_fops, 0666, },
2114         { "signal2", &spufs_signal2_fops, 0666, },
2115         { "signal1_type", &spufs_signal1_type, 0666, },
2116         { "signal2_type", &spufs_signal2_type, 0666, },
2117         { "cntl", &spufs_cntl_fops,  0666, },
2118         { "fpcr", &spufs_fpcr_fops, 0666, },
2119         { "lslr", &spufs_lslr_ops, 0444, },
2120         { "mfc", &spufs_mfc_fops, 0666, },
2121         { "mss", &spufs_mss_fops, 0666, },
2122         { "npc", &spufs_npc_ops, 0666, },
2123         { "srr0", &spufs_srr0_ops, 0666, },
2124         { "decr", &spufs_decr_ops, 0666, },
2125         { "decr_status", &spufs_decr_status_ops, 0666, },
2126         { "event_mask", &spufs_event_mask_ops, 0666, },
2127         { "event_status", &spufs_event_status_ops, 0444, },
2128         { "psmap", &spufs_psmap_fops, 0666, },
2129         { "phys-id", &spufs_id_ops, 0666, },
2130         { "object-id", &spufs_object_id_ops, 0666, },
2131         { "mbox_info", &spufs_mbox_info_fops, 0444, },
2132         { "ibox_info", &spufs_ibox_info_fops, 0444, },
2133         { "wbox_info", &spufs_wbox_info_fops, 0444, },
2134         { "dma_info", &spufs_dma_info_fops, 0444, },
2135         { "proxydma_info", &spufs_proxydma_info_fops, 0444, },
2136         { "tid", &spufs_tid_fops, 0444, },
2137         { "stat", &spufs_stat_fops, 0444, },
2138         {},
2139 };
2140
2141 struct tree_descr spufs_dir_nosched_contents[] = {
2142         { "capabilities", &spufs_caps_fops, 0444, },
2143         { "mem",  &spufs_mem_fops,  0666, },
2144         { "mbox", &spufs_mbox_fops, 0444, },
2145         { "ibox", &spufs_ibox_fops, 0444, },
2146         { "wbox", &spufs_wbox_fops, 0222, },
2147         { "mbox_stat", &spufs_mbox_stat_fops, 0444, },
2148         { "ibox_stat", &spufs_ibox_stat_fops, 0444, },
2149         { "wbox_stat", &spufs_wbox_stat_fops, 0444, },
2150         { "signal1", &spufs_signal1_nosched_fops, 0222, },
2151         { "signal2", &spufs_signal2_nosched_fops, 0222, },
2152         { "signal1_type", &spufs_signal1_type, 0666, },
2153         { "signal2_type", &spufs_signal2_type, 0666, },
2154         { "mss", &spufs_mss_fops, 0666, },
2155         { "mfc", &spufs_mfc_fops, 0666, },
2156         { "cntl", &spufs_cntl_fops,  0666, },
2157         { "npc", &spufs_npc_ops, 0666, },
2158         { "psmap", &spufs_psmap_fops, 0666, },
2159         { "phys-id", &spufs_id_ops, 0666, },
2160         { "object-id", &spufs_object_id_ops, 0666, },
2161         { "tid", &spufs_tid_fops, 0444, },
2162         { "stat", &spufs_stat_fops, 0444, },
2163         {},
2164 };
2165
2166 struct spufs_coredump_reader spufs_coredump_read[] = {
2167         { "regs", __spufs_regs_read, NULL, sizeof(struct spu_reg128[128])},
2168         { "fpcr", __spufs_fpcr_read, NULL, sizeof(struct spu_reg128) },
2169         { "lslr", NULL, spufs_lslr_get, 19 },
2170         { "decr", NULL, spufs_decr_get, 19 },
2171         { "decr_status", NULL, spufs_decr_status_get, 19 },
2172         { "mem", __spufs_mem_read, NULL, LS_SIZE, },
2173         { "signal1", __spufs_signal1_read, NULL, sizeof(u32) },
2174         { "signal1_type", NULL, spufs_signal1_type_get, 19 },
2175         { "signal2", __spufs_signal2_read, NULL, sizeof(u32) },
2176         { "signal2_type", NULL, spufs_signal2_type_get, 19 },
2177         { "event_mask", NULL, spufs_event_mask_get, 19 },
2178         { "event_status", NULL, spufs_event_status_get, 19 },
2179         { "mbox_info", __spufs_mbox_info_read, NULL, sizeof(u32) },
2180         { "ibox_info", __spufs_ibox_info_read, NULL, sizeof(u32) },
2181         { "wbox_info", __spufs_wbox_info_read, NULL, 4 * sizeof(u32)},
2182         { "dma_info", __spufs_dma_info_read, NULL, sizeof(struct spu_dma_info)},
2183         { "proxydma_info", __spufs_proxydma_info_read,
2184                            NULL, sizeof(struct spu_proxydma_info)},
2185         { "object-id", NULL, spufs_object_id_get, 19 },
2186         { "npc", NULL, spufs_npc_get, 19 },
2187         { NULL },
2188 };