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

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  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/export.h>
 28 #include <linux/pagemap.h>
 29 #include <linux/poll.h>
 30 #include <linux/ptrace.h>
 31 #include <linux/seq_file.h>
 32 #include <linux/slab.h>
 33 
 34 #include <asm/io.h>
 35 #include <asm/time.h>
 36 #include <asm/spu.h>
 37 #include <asm/spu_info.h>
 38 #include <linux/uaccess.h>
 39 
 40 #include "spufs.h"
 41 #include "sputrace.h"
 42 
 43 #define SPUFS_MMAP_4K (PAGE_SIZE == 0x1000)
 44 
 45 /* Simple attribute files */
 46 struct spufs_attr {
 47         int (*get)(void *, u64 *);
 48         int (*set)(void *, u64);
 49         char get_buf[24];       /* enough to store a u64 and "\n\0" */
 50         char set_buf[24];
 51         void *data;
 52         const char *fmt;        /* format for read operation */
 53         struct mutex mutex;     /* protects access to these buffers */
 54 };
 55 
 56 static int spufs_attr_open(struct inode *inode, struct file *file,
 57                 int (*get)(void *, u64 *), int (*set)(void *, u64),
 58                 const char *fmt)
 59 {
 60         struct spufs_attr *attr;
 61 
 62         attr = kmalloc(sizeof(*attr), GFP_KERNEL);
 63         if (!attr)
 64                 return -ENOMEM;
 65 
 66         attr->get = get;
 67         attr->set = set;
 68         attr->data = inode->i_private;
 69         attr->fmt = fmt;
 70         mutex_init(&attr->mutex);
 71         file->private_data = attr;
 72 
 73         return nonseekable_open(inode, file);
 74 }
 75 
 76 static int spufs_attr_release(struct inode *inode, struct file *file)
 77 {
 78        kfree(file->private_data);
 79         return 0;
 80 }
 81 
 82 static ssize_t spufs_attr_read(struct file *file, char __user *buf,
 83                 size_t len, loff_t *ppos)
 84 {
 85         struct spufs_attr *attr;
 86         size_t size;
 87         ssize_t ret;
 88 
 89         attr = file->private_data;
 90         if (!attr->get)
 91                 return -EACCES;
 92 
 93         ret = mutex_lock_interruptible(&attr->mutex);
 94         if (ret)
 95                 return ret;
 96 
 97         if (*ppos) {            /* continued read */
 98                 size = strlen(attr->get_buf);
 99         } else {                /* first read */
100                 u64 val;
101                 ret = attr->get(attr->data, &val);
102                 if (ret)
103                         goto out;
104 
105                 size = scnprintf(attr->get_buf, sizeof(attr->get_buf),
106                                  attr->fmt, (unsigned long long)val);
107         }
108 
109         ret = simple_read_from_buffer(buf, len, ppos, attr->get_buf, size);
110 out:
111         mutex_unlock(&attr->mutex);
112         return ret;
113 }
114 
115 static ssize_t spufs_attr_write(struct file *file, const char __user *buf,
116                 size_t len, loff_t *ppos)
117 {
118         struct spufs_attr *attr;
119         u64 val;
120         size_t size;
121         ssize_t ret;
122 
123         attr = file->private_data;
124         if (!attr->set)
125                 return -EACCES;
126 
127         ret = mutex_lock_interruptible(&attr->mutex);
128         if (ret)
129                 return ret;
130 
131         ret = -EFAULT;
132         size = min(sizeof(attr->set_buf) - 1, len);
133         if (copy_from_user(attr->set_buf, buf, size))
134                 goto out;
135 
136         ret = len; /* claim we got the whole input */
137         attr->set_buf[size] = '\0';
138         val = simple_strtol(attr->set_buf, NULL, 0);
139         attr->set(attr->data, val);
140 out:
141         mutex_unlock(&attr->mutex);
142         return ret;
143 }
144 
145 #define DEFINE_SPUFS_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt)      \
146 static int __fops ## _open(struct inode *inode, struct file *file)      \
147 {                                                                       \
148         __simple_attr_check_format(__fmt, 0ull);                        \
149         return spufs_attr_open(inode, file, __get, __set, __fmt);       \
150 }                                                                       \
151 static const struct file_operations __fops = {                          \
152         .open    = __fops ## _open,                                     \
153         .release = spufs_attr_release,                                  \
154         .read    = spufs_attr_read,                                     \
155         .write   = spufs_attr_write,                                    \
156         .llseek  = generic_file_llseek,                                 \
157 };
158 
159 
160 static int
161 spufs_mem_open(struct inode *inode, struct file *file)
162 {
163         struct spufs_inode_info *i = SPUFS_I(inode);
164         struct spu_context *ctx = i->i_ctx;
165 
166         mutex_lock(&ctx->mapping_lock);
167         file->private_data = ctx;
168         if (!i->i_openers++)
169                 ctx->local_store = inode->i_mapping;
170         mutex_unlock(&ctx->mapping_lock);
171         return 0;
172 }
173 
174 static int
175 spufs_mem_release(struct inode *inode, struct file *file)
176 {
177         struct spufs_inode_info *i = SPUFS_I(inode);
178         struct spu_context *ctx = i->i_ctx;
179 
180         mutex_lock(&ctx->mapping_lock);
181         if (!--i->i_openers)
182                 ctx->local_store = NULL;
183         mutex_unlock(&ctx->mapping_lock);
184         return 0;
185 }
186 
187 static ssize_t
188 __spufs_mem_read(struct spu_context *ctx, char __user *buffer,
189                         size_t size, loff_t *pos)
190 {
191         char *local_store = ctx->ops->get_ls(ctx);
192         return simple_read_from_buffer(buffer, size, pos, local_store,
193                                         LS_SIZE);
194 }
195 
196 static ssize_t
197 spufs_mem_read(struct file *file, char __user *buffer,
198                                 size_t size, loff_t *pos)
199 {
200         struct spu_context *ctx = file->private_data;
201         ssize_t ret;
202 
203         ret = spu_acquire(ctx);
204         if (ret)
205                 return ret;
206         ret = __spufs_mem_read(ctx, buffer, size, pos);
207         spu_release(ctx);
208 
209         return ret;
210 }
211 
212 static ssize_t
213 spufs_mem_write(struct file *file, const char __user *buffer,
214                                         size_t size, loff_t *ppos)
215 {
216         struct spu_context *ctx = file->private_data;
217         char *local_store;
218         loff_t pos = *ppos;
219         int ret;
220 
221         if (pos > LS_SIZE)
222                 return -EFBIG;
223 
224         ret = spu_acquire(ctx);
225         if (ret)
226                 return ret;
227 
228         local_store = ctx->ops->get_ls(ctx);
229         size = simple_write_to_buffer(local_store, LS_SIZE, ppos, buffer, size);
230         spu_release(ctx);
231 
232         return size;
233 }
234 
235 static int
236 spufs_mem_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
237 {
238         struct spu_context *ctx = vma->vm_file->private_data;
239         unsigned long pfn, offset;
240 
241         offset = vmf->pgoff << PAGE_SHIFT;
242         if (offset >= LS_SIZE)
243                 return VM_FAULT_SIGBUS;
244 
245         pr_debug("spufs_mem_mmap_fault address=0x%lx, offset=0x%lx\n",
246                         vmf->address, offset);
247 
248         if (spu_acquire(ctx))
249                 return VM_FAULT_NOPAGE;
250 
251         if (ctx->state == SPU_STATE_SAVED) {
252                 vma->vm_page_prot = pgprot_cached(vma->vm_page_prot);
253                 pfn = vmalloc_to_pfn(ctx->csa.lscsa->ls + offset);
254         } else {
255                 vma->vm_page_prot = pgprot_noncached_wc(vma->vm_page_prot);
256                 pfn = (ctx->spu->local_store_phys + offset) >> PAGE_SHIFT;
257         }
258         vm_insert_pfn(vma, vmf->address, pfn);
259 
260         spu_release(ctx);
261 
262         return VM_FAULT_NOPAGE;
263 }
264 
265 static int spufs_mem_mmap_access(struct vm_area_struct *vma,
266                                 unsigned long address,
267                                 void *buf, int len, int write)
268 {
269         struct spu_context *ctx = vma->vm_file->private_data;
270         unsigned long offset = address - vma->vm_start;
271         char *local_store;
272 
273         if (write && !(vma->vm_flags & VM_WRITE))
274                 return -EACCES;
275         if (spu_acquire(ctx))
276                 return -EINTR;
277         if ((offset + len) > vma->vm_end)
278                 len = vma->vm_end - offset;
279         local_store = ctx->ops->get_ls(ctx);
280         if (write)
281                 memcpy_toio(local_store + offset, buf, len);
282         else
283                 memcpy_fromio(buf, local_store + offset, len);
284         spu_release(ctx);
285         return len;
286 }
287 
288 static const struct vm_operations_struct spufs_mem_mmap_vmops = {
289         .fault = spufs_mem_mmap_fault,
290         .access = spufs_mem_mmap_access,
291 };
292 
293 static int spufs_mem_mmap(struct file *file, struct vm_area_struct *vma)
294 {
295         if (!(vma->vm_flags & VM_SHARED))
296                 return -EINVAL;
297 
298         vma->vm_flags |= VM_IO | VM_PFNMAP;
299         vma->vm_page_prot = pgprot_noncached_wc(vma->vm_page_prot);
300 
301         vma->vm_ops = &spufs_mem_mmap_vmops;
302         return 0;
303 }
304 
305 static const struct file_operations spufs_mem_fops = {
306         .open                   = spufs_mem_open,
307         .release                = spufs_mem_release,
308         .read                   = spufs_mem_read,
309         .write                  = spufs_mem_write,
310         .llseek                 = generic_file_llseek,
311         .mmap                   = spufs_mem_mmap,
312 };
313 
314 static int spufs_ps_fault(struct vm_area_struct *vma,
315                                     struct vm_fault *vmf,
316                                     unsigned long ps_offs,
317                                     unsigned long ps_size)
318 {
319         struct spu_context *ctx = vma->vm_file->private_data;
320         unsigned long area, offset = vmf->pgoff << PAGE_SHIFT;
321         int ret = 0;
322 
323         spu_context_nospu_trace(spufs_ps_fault__enter, ctx);
324 
325         if (offset >= ps_size)
326                 return VM_FAULT_SIGBUS;
327 
328         if (fatal_signal_pending(current))
329                 return VM_FAULT_SIGBUS;
330 
331         /*
332          * Because we release the mmap_sem, the context may be destroyed while
333          * we're in spu_wait. Grab an extra reference so it isn't destroyed
334          * in the meantime.
335          */
336         get_spu_context(ctx);
337 
338         /*
339          * We have to wait for context to be loaded before we have
340          * pages to hand out to the user, but we don't want to wait
341          * with the mmap_sem held.
342          * It is possible to drop the mmap_sem here, but then we need
343          * to return VM_FAULT_NOPAGE because the mappings may have
344          * hanged.
345          */
346         if (spu_acquire(ctx))
347                 goto refault;
348 
349         if (ctx->state == SPU_STATE_SAVED) {
350                 up_read(&current->mm->mmap_sem);
351                 spu_context_nospu_trace(spufs_ps_fault__sleep, ctx);
352                 ret = spufs_wait(ctx->run_wq, ctx->state == SPU_STATE_RUNNABLE);
353                 spu_context_trace(spufs_ps_fault__wake, ctx, ctx->spu);
354                 down_read(&current->mm->mmap_sem);
355         } else {
356                 area = ctx->spu->problem_phys + ps_offs;
357                 vm_insert_pfn(vma, vmf->address, (area + offset) >> PAGE_SHIFT);
358                 spu_context_trace(spufs_ps_fault__insert, ctx, ctx->spu);
359         }
360 
361         if (!ret)
362                 spu_release(ctx);
363 
364 refault:
365         put_spu_context(ctx);
366         return VM_FAULT_NOPAGE;
367 }
368 
369 #if SPUFS_MMAP_4K
370 static int spufs_cntl_mmap_fault(struct vm_area_struct *vma,
371                                            struct vm_fault *vmf)
372 {
373         return spufs_ps_fault(vma, vmf, 0x4000, SPUFS_CNTL_MAP_SIZE);
374 }
375 
376 static const struct vm_operations_struct spufs_cntl_mmap_vmops = {
377         .fault = spufs_cntl_mmap_fault,
378 };
379 
380 /*
381  * mmap support for problem state control area [0x4000 - 0x4fff].
382  */
383 static int spufs_cntl_mmap(struct file *file, struct vm_area_struct *vma)
384 {
385         if (!(vma->vm_flags & VM_SHARED))
386                 return -EINVAL;
387 
388         vma->vm_flags |= VM_IO | VM_PFNMAP;
389         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
390 
391         vma->vm_ops = &spufs_cntl_mmap_vmops;
392         return 0;
393 }
394 #else /* SPUFS_MMAP_4K */
395 #define spufs_cntl_mmap NULL
396 #endif /* !SPUFS_MMAP_4K */
397 
398 static int spufs_cntl_get(void *data, u64 *val)
399 {
400         struct spu_context *ctx = data;
401         int ret;
402 
403         ret = spu_acquire(ctx);
404         if (ret)
405                 return ret;
406         *val = ctx->ops->status_read(ctx);
407         spu_release(ctx);
408 
409         return 0;
410 }
411 
412 static int spufs_cntl_set(void *data, u64 val)
413 {
414         struct spu_context *ctx = data;
415         int ret;
416 
417         ret = spu_acquire(ctx);
418         if (ret)
419                 return ret;
420         ctx->ops->runcntl_write(ctx, val);
421         spu_release(ctx);
422 
423         return 0;
424 }
425 
426 static int spufs_cntl_open(struct inode *inode, struct file *file)
427 {
428         struct spufs_inode_info *i = SPUFS_I(inode);
429         struct spu_context *ctx = i->i_ctx;
430 
431         mutex_lock(&ctx->mapping_lock);
432         file->private_data = ctx;
433         if (!i->i_openers++)
434                 ctx->cntl = inode->i_mapping;
435         mutex_unlock(&ctx->mapping_lock);
436         return simple_attr_open(inode, file, spufs_cntl_get,
437                                         spufs_cntl_set, "0x%08lx");
438 }
439 
440 static int
441 spufs_cntl_release(struct inode *inode, struct file *file)
442 {
443         struct spufs_inode_info *i = SPUFS_I(inode);
444         struct spu_context *ctx = i->i_ctx;
445 
446         simple_attr_release(inode, file);
447 
448         mutex_lock(&ctx->mapping_lock);
449         if (!--i->i_openers)
450                 ctx->cntl = NULL;
451         mutex_unlock(&ctx->mapping_lock);
452         return 0;
453 }
454 
455 static const struct file_operations spufs_cntl_fops = {
456         .open = spufs_cntl_open,
457         .release = spufs_cntl_release,
458         .read = simple_attr_read,
459         .write = simple_attr_write,
460         .llseek = generic_file_llseek,
461         .mmap = spufs_cntl_mmap,
462 };
463 
464 static int
465 spufs_regs_open(struct inode *inode, struct file *file)
466 {
467         struct spufs_inode_info *i = SPUFS_I(inode);
468         file->private_data = i->i_ctx;
469         return 0;
470 }
471 
472 static ssize_t
473 __spufs_regs_read(struct spu_context *ctx, char __user *buffer,
474                         size_t size, loff_t *pos)
475 {
476         struct spu_lscsa *lscsa = ctx->csa.lscsa;
477         return simple_read_from_buffer(buffer, size, pos,
478                                       lscsa->gprs, sizeof lscsa->gprs);
479 }
480 
481 static ssize_t
482 spufs_regs_read(struct file *file, char __user *buffer,
483                 size_t size, loff_t *pos)
484 {
485         int ret;
486         struct spu_context *ctx = file->private_data;
487 
488         /* pre-check for file position: if we'd return EOF, there's no point
489          * causing a deschedule */
490         if (*pos >= sizeof(ctx->csa.lscsa->gprs))
491                 return 0;
492 
493         ret = spu_acquire_saved(ctx);
494         if (ret)
495                 return ret;
496         ret = __spufs_regs_read(ctx, buffer, size, pos);
497         spu_release_saved(ctx);
498         return ret;
499 }
500 
501 static ssize_t
502 spufs_regs_write(struct file *file, const char __user *buffer,
503                  size_t size, loff_t *pos)
504 {
505         struct spu_context *ctx = file->private_data;
506         struct spu_lscsa *lscsa = ctx->csa.lscsa;
507         int ret;
508 
509         if (*pos >= sizeof(lscsa->gprs))
510                 return -EFBIG;
511 
512         ret = spu_acquire_saved(ctx);
513         if (ret)
514                 return ret;
515 
516         size = simple_write_to_buffer(lscsa->gprs, sizeof(lscsa->gprs), pos,
517                                         buffer, size);
518 
519         spu_release_saved(ctx);
520         return size;
521 }
522 
523 static const struct file_operations spufs_regs_fops = {
524         .open    = spufs_regs_open,
525         .read    = spufs_regs_read,
526         .write   = spufs_regs_write,
527         .llseek  = generic_file_llseek,
528 };
529 
530 static ssize_t
531 __spufs_fpcr_read(struct spu_context *ctx, char __user * buffer,
532                         size_t size, loff_t * pos)
533 {
534         struct spu_lscsa *lscsa = ctx->csa.lscsa;
535         return simple_read_from_buffer(buffer, size, pos,
536                                       &lscsa->fpcr, sizeof(lscsa->fpcr));
537 }
538 
539 static ssize_t
540 spufs_fpcr_read(struct file *file, char __user * buffer,
541                 size_t size, loff_t * pos)
542 {
543         int ret;
544         struct spu_context *ctx = file->private_data;
545 
546         ret = spu_acquire_saved(ctx);
547         if (ret)
548                 return ret;
549         ret = __spufs_fpcr_read(ctx, buffer, size, pos);
550         spu_release_saved(ctx);
551         return ret;
552 }
553 
554 static ssize_t
555 spufs_fpcr_write(struct file *file, const char __user * buffer,
556                  size_t size, loff_t * pos)
557 {
558         struct spu_context *ctx = file->private_data;
559         struct spu_lscsa *lscsa = ctx->csa.lscsa;
560         int ret;
561 
562         if (*pos >= sizeof(lscsa->fpcr))
563                 return -EFBIG;
564 
565         ret = spu_acquire_saved(ctx);
566         if (ret)
567                 return ret;
568 
569         size = simple_write_to_buffer(&lscsa->fpcr, sizeof(lscsa->fpcr), pos,
570                                         buffer, size);
571 
572         spu_release_saved(ctx);
573         return size;
574 }
575 
576 static const struct file_operations spufs_fpcr_fops = {
577         .open = spufs_regs_open,
578         .read = spufs_fpcr_read,
579         .write = spufs_fpcr_write,
580         .llseek = generic_file_llseek,
581 };
582 
583 /* generic open function for all pipe-like files */
584 static int spufs_pipe_open(struct inode *inode, struct file *file)
585 {
586         struct spufs_inode_info *i = SPUFS_I(inode);
587         file->private_data = i->i_ctx;
588 
589         return nonseekable_open(inode, file);
590 }
591 
592 /*
593  * Read as many bytes from the mailbox as possible, until
594  * one of the conditions becomes true:
595  *
596  * - no more data available in the mailbox
597  * - end of the user provided buffer
598  * - end of the mapped area
599  */
600 static ssize_t spufs_mbox_read(struct file *file, char __user *buf,
601                         size_t len, loff_t *pos)
602 {
603         struct spu_context *ctx = file->private_data;
604         u32 mbox_data, __user *udata;
605         ssize_t count;
606 
607         if (len < 4)
608                 return -EINVAL;
609 
610         if (!access_ok(VERIFY_WRITE, buf, len))
611                 return -EFAULT;
612 
613         udata = (void __user *)buf;
614 
615         count = spu_acquire(ctx);
616         if (count)
617                 return count;
618 
619         for (count = 0; (count + 4) <= len; count += 4, udata++) {
620                 int ret;
621                 ret = ctx->ops->mbox_read(ctx, &mbox_data);
622                 if (ret == 0)
623                         break;
624 
625                 /*
626                  * at the end of the mapped area, we can fault
627                  * but still need to return the data we have
628                  * read successfully so far.
629                  */
630                 ret = __put_user(mbox_data, udata);
631                 if (ret) {
632                         if (!count)
633                                 count = -EFAULT;
634                         break;
635                 }
636         }
637         spu_release(ctx);
638 
639         if (!count)
640                 count = -EAGAIN;
641 
642         return count;
643 }
644 
645 static const struct file_operations spufs_mbox_fops = {
646         .open   = spufs_pipe_open,
647         .read   = spufs_mbox_read,
648         .llseek = no_llseek,
649 };
650 
651 static ssize_t spufs_mbox_stat_read(struct file *file, char __user *buf,
652                         size_t len, loff_t *pos)
653 {
654         struct spu_context *ctx = file->private_data;
655         ssize_t ret;
656         u32 mbox_stat;
657 
658         if (len < 4)
659                 return -EINVAL;
660 
661         ret = spu_acquire(ctx);
662         if (ret)
663                 return ret;
664 
665         mbox_stat = ctx->ops->mbox_stat_read(ctx) & 0xff;
666 
667         spu_release(ctx);
668 
669         if (copy_to_user(buf, &mbox_stat, sizeof mbox_stat))
670                 return -EFAULT;
671 
672         return 4;
673 }
674 
675 static const struct file_operations spufs_mbox_stat_fops = {
676         .open   = spufs_pipe_open,
677         .read   = spufs_mbox_stat_read,
678         .llseek = no_llseek,
679 };
680 
681 /* low-level ibox access function */
682 size_t spu_ibox_read(struct spu_context *ctx, u32 *data)
683 {
684         return ctx->ops->ibox_read(ctx, data);
685 }
686 
687 static int spufs_ibox_fasync(int fd, struct file *file, int on)
688 {
689         struct spu_context *ctx = file->private_data;
690 
691         return fasync_helper(fd, file, on, &ctx->ibox_fasync);
692 }
693 
694 /* interrupt-level ibox callback function. */
695 void spufs_ibox_callback(struct spu *spu)
696 {
697         struct spu_context *ctx = spu->ctx;
698 
699         if (!ctx)
700                 return;
701 
702         wake_up_all(&ctx->ibox_wq);
703         kill_fasync(&ctx->ibox_fasync, SIGIO, POLLIN);
704 }
705 
706 /*
707  * Read as many bytes from the interrupt mailbox as possible, until
708  * one of the conditions becomes true:
709  *
710  * - no more data available in the mailbox
711  * - end of the user provided buffer
712  * - end of the mapped area
713  *
714  * If the file is opened without O_NONBLOCK, we wait here until
715  * any data is available, but return when we have been able to
716  * read something.
717  */
718 static ssize_t spufs_ibox_read(struct file *file, char __user *buf,
719                         size_t len, loff_t *pos)
720 {
721         struct spu_context *ctx = file->private_data;
722         u32 ibox_data, __user *udata;
723         ssize_t count;
724 
725         if (len < 4)
726                 return -EINVAL;
727 
728         if (!access_ok(VERIFY_WRITE, buf, len))
729                 return -EFAULT;
730 
731         udata = (void __user *)buf;
732 
733         count = spu_acquire(ctx);
734         if (count)
735                 goto out;
736 
737         /* wait only for the first element */
738         count = 0;
739         if (file->f_flags & O_NONBLOCK) {
740                 if (!spu_ibox_read(ctx, &ibox_data)) {
741                         count = -EAGAIN;
742                         goto out_unlock;
743                 }
744         } else {
745                 count = spufs_wait(ctx->ibox_wq, spu_ibox_read(ctx, &ibox_data));
746                 if (count)
747                         goto out;
748         }
749 
750         /* if we can't write at all, return -EFAULT */
751         count = __put_user(ibox_data, udata);
752         if (count)
753                 goto out_unlock;
754 
755         for (count = 4, udata++; (count + 4) <= len; count += 4, udata++) {
756                 int ret;
757                 ret = ctx->ops->ibox_read(ctx, &ibox_data);
758                 if (ret == 0)
759                         break;
760                 /*
761                  * at the end of the mapped area, we can fault
762                  * but still need to return the data we have
763                  * read successfully so far.
764                  */
765                 ret = __put_user(ibox_data, udata);
766                 if (ret)
767                         break;
768         }
769 
770 out_unlock:
771         spu_release(ctx);
772 out:
773         return count;
774 }
775 
776 static unsigned int spufs_ibox_poll(struct file *file, poll_table *wait)
777 {
778         struct spu_context *ctx = file->private_data;
779         unsigned int mask;
780 
781         poll_wait(file, &ctx->ibox_wq, wait);
782 
783         /*
784          * For now keep this uninterruptible and also ignore the rule
785          * that poll should not sleep.  Will be fixed later.
786          */
787         mutex_lock(&ctx->state_mutex);
788         mask = ctx->ops->mbox_stat_poll(ctx, POLLIN | POLLRDNORM);
789         spu_release(ctx);
790 
791         return mask;
792 }
793 
794 static const struct file_operations spufs_ibox_fops = {
795         .open   = spufs_pipe_open,
796         .read   = spufs_ibox_read,
797         .poll   = spufs_ibox_poll,
798         .fasync = spufs_ibox_fasync,
799         .llseek = no_llseek,
800 };
801 
802 static ssize_t spufs_ibox_stat_read(struct file *file, char __user *buf,
803                         size_t len, loff_t *pos)
804 {
805         struct spu_context *ctx = file->private_data;
806         ssize_t ret;
807         u32 ibox_stat;
808 
809         if (len < 4)
810                 return -EINVAL;
811 
812         ret = spu_acquire(ctx);
813         if (ret)
814                 return ret;
815         ibox_stat = (ctx->ops->mbox_stat_read(ctx) >> 16) & 0xff;
816         spu_release(ctx);
817 
818         if (copy_to_user(buf, &ibox_stat, sizeof ibox_stat))
819                 return -EFAULT;
820 
821         return 4;
822 }
823 
824 static const struct file_operations spufs_ibox_stat_fops = {
825         .open   = spufs_pipe_open,
826         .read   = spufs_ibox_stat_read,
827         .llseek = no_llseek,
828 };
829 
830 /* low-level mailbox write */
831 size_t spu_wbox_write(struct spu_context *ctx, u32 data)
832 {
833         return ctx->ops->wbox_write(ctx, data);
834 }
835 
836 static int spufs_wbox_fasync(int fd, struct file *file, int on)
837 {
838         struct spu_context *ctx = file->private_data;
839         int ret;
840 
841         ret = fasync_helper(fd, file, on, &ctx->wbox_fasync);
842 
843         return ret;
844 }
845 
846 /* interrupt-level wbox callback function. */
847 void spufs_wbox_callback(struct spu *spu)
848 {
849         struct spu_context *ctx = spu->ctx;
850 
851         if (!ctx)
852                 return;
853 
854         wake_up_all(&ctx->wbox_wq);
855         kill_fasync(&ctx->wbox_fasync, SIGIO, POLLOUT);
856 }
857 
858 /*
859  * Write as many bytes to the interrupt mailbox as possible, until
860  * one of the conditions becomes true:
861  *
862  * - the mailbox is full
863  * - end of the user provided buffer
864  * - end of the mapped area
865  *
866  * If the file is opened without O_NONBLOCK, we wait here until
867  * space is available, but return when we have been able to
868  * write something.
869  */
870 static ssize_t spufs_wbox_write(struct file *file, const char __user *buf,
871                         size_t len, loff_t *pos)
872 {
873         struct spu_context *ctx = file->private_data;
874         u32 wbox_data, __user *udata;
875         ssize_t count;
876 
877         if (len < 4)
878                 return -EINVAL;
879 
880         udata = (void __user *)buf;
881         if (!access_ok(VERIFY_READ, buf, len))
882                 return -EFAULT;
883 
884         if (__get_user(wbox_data, udata))
885                 return -EFAULT;
886 
887         count = spu_acquire(ctx);
888         if (count)
889                 goto out;
890 
891         /*
892          * make sure we can at least write one element, by waiting
893          * in case of !O_NONBLOCK
894          */
895         count = 0;
896         if (file->f_flags & O_NONBLOCK) {
897                 if (!spu_wbox_write(ctx, wbox_data)) {
898                         count = -EAGAIN;
899                         goto out_unlock;
900                 }
901         } else {
902                 count = spufs_wait(ctx->wbox_wq, spu_wbox_write(ctx, wbox_data));
903                 if (count)
904                         goto out;
905         }
906 
907 
908         /* write as much as possible */
909         for (count = 4, udata++; (count + 4) <= len; count += 4, udata++) {
910                 int ret;
911                 ret = __get_user(wbox_data, udata);
912                 if (ret)
913                         break;
914 
915                 ret = spu_wbox_write(ctx, wbox_data);
916                 if (ret == 0)
917                         break;
918         }
919 
920 out_unlock:
921         spu_release(ctx);
922 out:
923         return count;
924 }
925 
926 static unsigned int spufs_wbox_poll(struct file *file, poll_table *wait)
927 {
928         struct spu_context *ctx = file->private_data;
929         unsigned int mask;
930 
931         poll_wait(file, &ctx->wbox_wq, wait);
932 
933         /*
934          * For now keep this uninterruptible and also ignore the rule
935          * that poll should not sleep.  Will be fixed later.
936          */
937         mutex_lock(&ctx->state_mutex);
938         mask = ctx->ops->mbox_stat_poll(ctx, POLLOUT | POLLWRNORM);
939         spu_release(ctx);
940 
941         return mask;
942 }
943 
944 static const struct file_operations spufs_wbox_fops = {
945         .open   = spufs_pipe_open,
946         .write  = spufs_wbox_write,
947         .poll   = spufs_wbox_poll,
948         .fasync = spufs_wbox_fasync,
949         .llseek = no_llseek,
950 };
951 
952 static ssize_t spufs_wbox_stat_read(struct file *file, char __user *buf,
953                         size_t len, loff_t *pos)
954 {
955         struct spu_context *ctx = file->private_data;
956         ssize_t ret;
957         u32 wbox_stat;
958 
959         if (len < 4)
960                 return -EINVAL;
961 
962         ret = spu_acquire(ctx);
963         if (ret)
964                 return ret;
965         wbox_stat = (ctx->ops->mbox_stat_read(ctx) >> 8) & 0xff;
966         spu_release(ctx);
967 
968         if (copy_to_user(buf, &wbox_stat, sizeof wbox_stat))
969                 return -EFAULT;
970 
971         return 4;
972 }
973 
974 static const struct file_operations spufs_wbox_stat_fops = {
975         .open   = spufs_pipe_open,
976         .read   = spufs_wbox_stat_read,
977         .llseek = no_llseek,
978 };
979 
980 static int spufs_signal1_open(struct inode *inode, struct file *file)
981 {
982         struct spufs_inode_info *i = SPUFS_I(inode);
983         struct spu_context *ctx = i->i_ctx;
984 
985         mutex_lock(&ctx->mapping_lock);
986         file->private_data = ctx;
987         if (!i->i_openers++)
988                 ctx->signal1 = inode->i_mapping;
989         mutex_unlock(&ctx->mapping_lock);
990         return nonseekable_open(inode, file);
991 }
992 
993 static int
994 spufs_signal1_release(struct inode *inode, struct file *file)
995 {
996         struct spufs_inode_info *i = SPUFS_I(inode);
997         struct spu_context *ctx = i->i_ctx;
998 
999         mutex_lock(&ctx->mapping_lock);
1000         if (!--i->i_openers)
1001                 ctx->signal1 = NULL;
1002         mutex_unlock(&ctx->mapping_lock);
1003         return 0;
1004 }
1005 
1006 static ssize_t __spufs_signal1_read(struct spu_context *ctx, char __user *buf,
1007                         size_t len, loff_t *pos)
1008 {
1009         int ret = 0;
1010         u32 data;
1011 
1012         if (len < 4)
1013                 return -EINVAL;
1014 
1015         if (ctx->csa.spu_chnlcnt_RW[3]) {
1016                 data = ctx->csa.spu_chnldata_RW[3];
1017                 ret = 4;
1018         }
1019 
1020         if (!ret)
1021                 goto out;
1022 
1023         if (copy_to_user(buf, &data, 4))
1024                 return -EFAULT;
1025 
1026 out:
1027         return ret;
1028 }
1029 
1030 static ssize_t spufs_signal1_read(struct file *file, char __user *buf,
1031                         size_t len, loff_t *pos)
1032 {
1033         int ret;
1034         struct spu_context *ctx = file->private_data;
1035 
1036         ret = spu_acquire_saved(ctx);
1037         if (ret)
1038                 return ret;
1039         ret = __spufs_signal1_read(ctx, buf, len, pos);
1040         spu_release_saved(ctx);
1041 
1042         return ret;
1043 }
1044 
1045 static ssize_t spufs_signal1_write(struct file *file, const char __user *buf,
1046                         size_t len, loff_t *pos)
1047 {
1048         struct spu_context *ctx;
1049         ssize_t ret;
1050         u32 data;
1051 
1052         ctx = file->private_data;
1053 
1054         if (len < 4)
1055                 return -EINVAL;
1056 
1057         if (copy_from_user(&data, buf, 4))
1058                 return -EFAULT;
1059 
1060         ret = spu_acquire(ctx);
1061         if (ret)
1062                 return ret;
1063         ctx->ops->signal1_write(ctx, data);
1064         spu_release(ctx);
1065 
1066         return 4;
1067 }
1068 
1069 static int
1070 spufs_signal1_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1071 {
1072 #if SPUFS_SIGNAL_MAP_SIZE == 0x1000
1073         return spufs_ps_fault(vma, vmf, 0x14000, SPUFS_SIGNAL_MAP_SIZE);
1074 #elif SPUFS_SIGNAL_MAP_SIZE == 0x10000
1075         /* For 64k pages, both signal1 and signal2 can be used to mmap the whole
1076          * signal 1 and 2 area
1077          */
1078         return spufs_ps_fault(vma, vmf, 0x10000, SPUFS_SIGNAL_MAP_SIZE);
1079 #else
1080 #error unsupported page size
1081 #endif
1082 }
1083 
1084 static const struct vm_operations_struct spufs_signal1_mmap_vmops = {
1085         .fault = spufs_signal1_mmap_fault,
1086 };
1087 
1088 static int spufs_signal1_mmap(struct file *file, struct vm_area_struct *vma)
1089 {
1090         if (!(vma->vm_flags & VM_SHARED))
1091                 return -EINVAL;
1092 
1093         vma->vm_flags |= VM_IO | VM_PFNMAP;
1094         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1095 
1096         vma->vm_ops = &spufs_signal1_mmap_vmops;
1097         return 0;
1098 }
1099 
1100 static const struct file_operations spufs_signal1_fops = {
1101         .open = spufs_signal1_open,
1102         .release = spufs_signal1_release,
1103         .read = spufs_signal1_read,
1104         .write = spufs_signal1_write,
1105         .mmap = spufs_signal1_mmap,
1106         .llseek = no_llseek,
1107 };
1108 
1109 static const struct file_operations spufs_signal1_nosched_fops = {
1110         .open = spufs_signal1_open,
1111         .release = spufs_signal1_release,
1112         .write = spufs_signal1_write,
1113         .mmap = spufs_signal1_mmap,
1114         .llseek = no_llseek,
1115 };
1116 
1117 static int spufs_signal2_open(struct inode *inode, struct file *file)
1118 {
1119         struct spufs_inode_info *i = SPUFS_I(inode);
1120         struct spu_context *ctx = i->i_ctx;
1121 
1122         mutex_lock(&ctx->mapping_lock);
1123         file->private_data = ctx;
1124         if (!i->i_openers++)
1125                 ctx->signal2 = inode->i_mapping;
1126         mutex_unlock(&ctx->mapping_lock);
1127         return nonseekable_open(inode, file);
1128 }
1129 
1130 static int
1131 spufs_signal2_release(struct inode *inode, struct file *file)
1132 {
1133         struct spufs_inode_info *i = SPUFS_I(inode);
1134         struct spu_context *ctx = i->i_ctx;
1135 
1136         mutex_lock(&ctx->mapping_lock);
1137         if (!--i->i_openers)
1138                 ctx->signal2 = NULL;
1139         mutex_unlock(&ctx->mapping_lock);
1140         return 0;
1141 }
1142 
1143 static ssize_t __spufs_signal2_read(struct spu_context *ctx, char __user *buf,
1144                         size_t len, loff_t *pos)
1145 {
1146         int ret = 0;
1147         u32 data;
1148 
1149         if (len < 4)
1150                 return -EINVAL;
1151 
1152         if (ctx->csa.spu_chnlcnt_RW[4]) {
1153                 data =  ctx->csa.spu_chnldata_RW[4];
1154                 ret = 4;
1155         }
1156 
1157         if (!ret)
1158                 goto out;
1159 
1160         if (copy_to_user(buf, &data, 4))
1161                 return -EFAULT;
1162 
1163 out:
1164         return ret;
1165 }
1166 
1167 static ssize_t spufs_signal2_read(struct file *file, char __user *buf,
1168                         size_t len, loff_t *pos)
1169 {
1170         struct spu_context *ctx = file->private_data;
1171         int ret;
1172 
1173         ret = spu_acquire_saved(ctx);
1174         if (ret)
1175                 return ret;
1176         ret = __spufs_signal2_read(ctx, buf, len, pos);
1177         spu_release_saved(ctx);
1178 
1179         return ret;
1180 }
1181 
1182 static ssize_t spufs_signal2_write(struct file *file, const char __user *buf,
1183                         size_t len, loff_t *pos)
1184 {
1185         struct spu_context *ctx;
1186         ssize_t ret;
1187         u32 data;
1188 
1189         ctx = file->private_data;
1190 
1191         if (len < 4)
1192                 return -EINVAL;
1193 
1194         if (copy_from_user(&data, buf, 4))
1195                 return -EFAULT;
1196 
1197         ret = spu_acquire(ctx);
1198         if (ret)
1199                 return ret;
1200         ctx->ops->signal2_write(ctx, data);
1201         spu_release(ctx);
1202 
1203         return 4;
1204 }
1205 
1206 #if SPUFS_MMAP_4K
1207 static int
1208 spufs_signal2_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1209 {
1210 #if SPUFS_SIGNAL_MAP_SIZE == 0x1000
1211         return spufs_ps_fault(vma, vmf, 0x1c000, SPUFS_SIGNAL_MAP_SIZE);
1212 #elif SPUFS_SIGNAL_MAP_SIZE == 0x10000
1213         /* For 64k pages, both signal1 and signal2 can be used to mmap the whole
1214          * signal 1 and 2 area
1215          */
1216         return spufs_ps_fault(vma, vmf, 0x10000, SPUFS_SIGNAL_MAP_SIZE);
1217 #else
1218 #error unsupported page size
1219 #endif
1220 }
1221 
1222 static const struct vm_operations_struct spufs_signal2_mmap_vmops = {
1223         .fault = spufs_signal2_mmap_fault,
1224 };
1225 
1226 static int spufs_signal2_mmap(struct file *file, struct vm_area_struct *vma)
1227 {
1228         if (!(vma->vm_flags & VM_SHARED))
1229                 return -EINVAL;
1230 
1231         vma->vm_flags |= VM_IO | VM_PFNMAP;
1232         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1233 
1234         vma->vm_ops = &spufs_signal2_mmap_vmops;
1235         return 0;
1236 }
1237 #else /* SPUFS_MMAP_4K */
1238 #define spufs_signal2_mmap NULL
1239 #endif /* !SPUFS_MMAP_4K */
1240 
1241 static const struct file_operations spufs_signal2_fops = {
1242         .open = spufs_signal2_open,
1243         .release = spufs_signal2_release,
1244         .read = spufs_signal2_read,
1245         .write = spufs_signal2_write,
1246         .mmap = spufs_signal2_mmap,
1247         .llseek = no_llseek,
1248 };
1249 
1250 static const struct file_operations spufs_signal2_nosched_fops = {
1251         .open = spufs_signal2_open,
1252         .release = spufs_signal2_release,
1253         .write = spufs_signal2_write,
1254         .mmap = spufs_signal2_mmap,
1255         .llseek = no_llseek,
1256 };
1257 
1258 /*
1259  * This is a wrapper around DEFINE_SIMPLE_ATTRIBUTE which does the
1260  * work of acquiring (or not) the SPU context before calling through
1261  * to the actual get routine. The set routine is called directly.
1262  */
1263 #define SPU_ATTR_NOACQUIRE      0
1264 #define SPU_ATTR_ACQUIRE        1
1265 #define SPU_ATTR_ACQUIRE_SAVED  2
1266 
1267 #define DEFINE_SPUFS_ATTRIBUTE(__name, __get, __set, __fmt, __acquire)  \
1268 static int __##__get(void *data, u64 *val)                              \
1269 {                                                                       \
1270         struct spu_context *ctx = data;                                 \
1271         int ret = 0;                                                    \
1272                                                                         \
1273         if (__acquire == SPU_ATTR_ACQUIRE) {                            \
1274                 ret = spu_acquire(ctx);                                 \
1275                 if (ret)                                                \
1276                         return ret;                                     \
1277                 *val = __get(ctx);                                      \
1278                 spu_release(ctx);                                       \
1279         } else if (__acquire == SPU_ATTR_ACQUIRE_SAVED) {               \
1280                 ret = spu_acquire_saved(ctx);                           \
1281                 if (ret)                                                \
1282                         return ret;                                     \
1283                 *val = __get(ctx);                                      \
1284                 spu_release_saved(ctx);                                 \
1285         } else                                                          \
1286                 *val = __get(ctx);                                      \
1287                                                                         \
1288         return 0;                                                       \
1289 }                                                                       \
1290 DEFINE_SPUFS_SIMPLE_ATTRIBUTE(__name, __##__get, __set, __fmt);
1291 
1292 static int spufs_signal1_type_set(void *data, u64 val)
1293 {
1294         struct spu_context *ctx = data;
1295         int ret;
1296 
1297         ret = spu_acquire(ctx);
1298         if (ret)
1299                 return ret;
1300         ctx->ops->signal1_type_set(ctx, val);
1301         spu_release(ctx);
1302 
1303         return 0;
1304 }
1305 
1306 static u64 spufs_signal1_type_get(struct spu_context *ctx)
1307 {
1308         return ctx->ops->signal1_type_get(ctx);
1309 }
1310 DEFINE_SPUFS_ATTRIBUTE(spufs_signal1_type, spufs_signal1_type_get,
1311                        spufs_signal1_type_set, "%llu\n", SPU_ATTR_ACQUIRE);
1312 
1313 
1314 static int spufs_signal2_type_set(void *data, u64 val)
1315 {
1316         struct spu_context *ctx = data;
1317         int ret;
1318 
1319         ret = spu_acquire(ctx);
1320         if (ret)
1321                 return ret;
1322         ctx->ops->signal2_type_set(ctx, val);
1323         spu_release(ctx);
1324 
1325         return 0;
1326 }
1327 
1328 static u64 spufs_signal2_type_get(struct spu_context *ctx)
1329 {
1330         return ctx->ops->signal2_type_get(ctx);
1331 }
1332 DEFINE_SPUFS_ATTRIBUTE(spufs_signal2_type, spufs_signal2_type_get,
1333                        spufs_signal2_type_set, "%llu\n", SPU_ATTR_ACQUIRE);
1334 
1335 #if SPUFS_MMAP_4K
1336 static int
1337 spufs_mss_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1338 {
1339         return spufs_ps_fault(vma, vmf, 0x0000, SPUFS_MSS_MAP_SIZE);
1340 }
1341 
1342 static const struct vm_operations_struct spufs_mss_mmap_vmops = {
1343         .fault = spufs_mss_mmap_fault,
1344 };
1345 
1346 /*
1347  * mmap support for problem state MFC DMA area [0x0000 - 0x0fff].
1348  */
1349 static int spufs_mss_mmap(struct file *file, struct vm_area_struct *vma)
1350 {
1351         if (!(vma->vm_flags & VM_SHARED))
1352                 return -EINVAL;
1353 
1354         vma->vm_flags |= VM_IO | VM_PFNMAP;
1355         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1356 
1357         vma->vm_ops = &spufs_mss_mmap_vmops;
1358         return 0;
1359 }
1360 #else /* SPUFS_MMAP_4K */
1361 #define spufs_mss_mmap NULL
1362 #endif /* !SPUFS_MMAP_4K */
1363 
1364 static int spufs_mss_open(struct inode *inode, struct file *file)
1365 {
1366         struct spufs_inode_info *i = SPUFS_I(inode);
1367         struct spu_context *ctx = i->i_ctx;
1368 
1369         file->private_data = i->i_ctx;
1370 
1371         mutex_lock(&ctx->mapping_lock);
1372         if (!i->i_openers++)
1373                 ctx->mss = inode->i_mapping;
1374         mutex_unlock(&ctx->mapping_lock);
1375         return nonseekable_open(inode, file);
1376 }
1377 
1378 static int
1379 spufs_mss_release(struct inode *inode, struct file *file)
1380 {
1381         struct spufs_inode_info *i = SPUFS_I(inode);
1382         struct spu_context *ctx = i->i_ctx;
1383 
1384         mutex_lock(&ctx->mapping_lock);
1385         if (!--i->i_openers)
1386                 ctx->mss = NULL;
1387         mutex_unlock(&ctx->mapping_lock);
1388         return 0;
1389 }
1390 
1391 static const struct file_operations spufs_mss_fops = {
1392         .open    = spufs_mss_open,
1393         .release = spufs_mss_release,
1394         .mmap    = spufs_mss_mmap,
1395         .llseek  = no_llseek,
1396 };
1397 
1398 static int
1399 spufs_psmap_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1400 {
1401         return spufs_ps_fault(vma, vmf, 0x0000, SPUFS_PS_MAP_SIZE);
1402 }
1403 
1404 static const struct vm_operations_struct spufs_psmap_mmap_vmops = {
1405         .fault = spufs_psmap_mmap_fault,
1406 };
1407 
1408 /*
1409  * mmap support for full problem state area [0x00000 - 0x1ffff].
1410  */
1411 static int spufs_psmap_mmap(struct file *file, struct vm_area_struct *vma)
1412 {
1413         if (!(vma->vm_flags & VM_SHARED))
1414                 return -EINVAL;
1415 
1416         vma->vm_flags |= VM_IO | VM_PFNMAP;
1417         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1418 
1419         vma->vm_ops = &spufs_psmap_mmap_vmops;
1420         return 0;
1421 }
1422 
1423 static int spufs_psmap_open(struct inode *inode, struct file *file)
1424 {
1425         struct spufs_inode_info *i = SPUFS_I(inode);
1426         struct spu_context *ctx = i->i_ctx;
1427 
1428         mutex_lock(&ctx->mapping_lock);
1429         file->private_data = i->i_ctx;
1430         if (!i->i_openers++)
1431                 ctx->psmap = inode->i_mapping;
1432         mutex_unlock(&ctx->mapping_lock);
1433         return nonseekable_open(inode, file);
1434 }
1435 
1436 static int
1437 spufs_psmap_release(struct inode *inode, struct file *file)
1438 {
1439         struct spufs_inode_info *i = SPUFS_I(inode);
1440         struct spu_context *ctx = i->i_ctx;
1441 
1442         mutex_lock(&ctx->mapping_lock);
1443         if (!--i->i_openers)
1444                 ctx->psmap = NULL;
1445         mutex_unlock(&ctx->mapping_lock);
1446         return 0;
1447 }
1448 
1449 static const struct file_operations spufs_psmap_fops = {
1450         .open    = spufs_psmap_open,
1451         .release = spufs_psmap_release,
1452         .mmap    = spufs_psmap_mmap,
1453         .llseek  = no_llseek,
1454 };
1455 
1456 
1457 #if SPUFS_MMAP_4K
1458 static int
1459 spufs_mfc_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1460 {
1461         return spufs_ps_fault(vma, vmf, 0x3000, SPUFS_MFC_MAP_SIZE);
1462 }
1463 
1464 static const struct vm_operations_struct spufs_mfc_mmap_vmops = {
1465         .fault = spufs_mfc_mmap_fault,
1466 };
1467 
1468 /*
1469  * mmap support for problem state MFC DMA area [0x0000 - 0x0fff].
1470  */
1471 static int spufs_mfc_mmap(struct file *file, struct vm_area_struct *vma)
1472 {
1473         if (!(vma->vm_flags & VM_SHARED))
1474                 return -EINVAL;
1475 
1476         vma->vm_flags |= VM_IO | VM_PFNMAP;
1477         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1478 
1479         vma->vm_ops = &spufs_mfc_mmap_vmops;
1480         return 0;
1481 }
1482 #else /* SPUFS_MMAP_4K */
1483 #define spufs_mfc_mmap NULL
1484 #endif /* !SPUFS_MMAP_4K */
1485 
1486 static int spufs_mfc_open(struct inode *inode, struct file *file)
1487 {
1488         struct spufs_inode_info *i = SPUFS_I(inode);
1489         struct spu_context *ctx = i->i_ctx;
1490 
1491         /* we don't want to deal with DMA into other processes */
1492         if (ctx->owner != current->mm)
1493                 return -EINVAL;
1494 
1495         if (atomic_read(&inode->i_count) != 1)
1496                 return -EBUSY;
1497 
1498         mutex_lock(&ctx->mapping_lock);
1499         file->private_data = ctx;
1500         if (!i->i_openers++)
1501                 ctx->mfc = inode->i_mapping;
1502         mutex_unlock(&ctx->mapping_lock);
1503         return nonseekable_open(inode, file);
1504 }
1505 
1506 static int
1507 spufs_mfc_release(struct inode *inode, struct file *file)
1508 {
1509         struct spufs_inode_info *i = SPUFS_I(inode);
1510         struct spu_context *ctx = i->i_ctx;
1511 
1512         mutex_lock(&ctx->mapping_lock);
1513         if (!--i->i_openers)
1514                 ctx->mfc = NULL;
1515         mutex_unlock(&ctx->mapping_lock);
1516         return 0;
1517 }
1518 
1519 /* interrupt-level mfc callback function. */
1520 void spufs_mfc_callback(struct spu *spu)
1521 {
1522         struct spu_context *ctx = spu->ctx;
1523 
1524         if (!ctx)
1525                 return;
1526 
1527         wake_up_all(&ctx->mfc_wq);
1528 
1529         pr_debug("%s %s\n", __func__, spu->name);
1530         if (ctx->mfc_fasync) {
1531                 u32 free_elements, tagstatus;
1532                 unsigned int mask;
1533 
1534                 /* no need for spu_acquire in interrupt context */
1535                 free_elements = ctx->ops->get_mfc_free_elements(ctx);
1536                 tagstatus = ctx->ops->read_mfc_tagstatus(ctx);
1537 
1538                 mask = 0;
1539                 if (free_elements & 0xffff)
1540                         mask |= POLLOUT;
1541                 if (tagstatus & ctx->tagwait)
1542                         mask |= POLLIN;
1543 
1544                 kill_fasync(&ctx->mfc_fasync, SIGIO, mask);
1545         }
1546 }
1547 
1548 static int spufs_read_mfc_tagstatus(struct spu_context *ctx, u32 *status)
1549 {
1550         /* See if there is one tag group is complete */
1551         /* FIXME we need locking around tagwait */
1552         *status = ctx->ops->read_mfc_tagstatus(ctx) & ctx->tagwait;
1553         ctx->tagwait &= ~*status;
1554         if (*status)
1555                 return 1;
1556 
1557         /* enable interrupt waiting for any tag group,
1558            may silently fail if interrupts are already enabled */
1559         ctx->ops->set_mfc_query(ctx, ctx->tagwait, 1);
1560         return 0;
1561 }
1562 
1563 static ssize_t spufs_mfc_read(struct file *file, char __user *buffer,
1564                         size_t size, loff_t *pos)
1565 {
1566         struct spu_context *ctx = file->private_data;
1567         int ret = -EINVAL;
1568         u32 status;
1569 
1570         if (size != 4)
1571                 goto out;
1572 
1573         ret = spu_acquire(ctx);
1574         if (ret)
1575                 return ret;
1576 
1577         ret = -EINVAL;
1578         if (file->f_flags & O_NONBLOCK) {
1579                 status = ctx->ops->read_mfc_tagstatus(ctx);
1580                 if (!(status & ctx->tagwait))
1581                         ret = -EAGAIN;
1582                 else
1583                         /* XXX(hch): shouldn't we clear ret here? */
1584                         ctx->tagwait &= ~status;
1585         } else {
1586                 ret = spufs_wait(ctx->mfc_wq,
1587                            spufs_read_mfc_tagstatus(ctx, &status));
1588                 if (ret)
1589                         goto out;
1590         }
1591         spu_release(ctx);
1592 
1593         ret = 4;
1594         if (copy_to_user(buffer, &status, 4))
1595                 ret = -EFAULT;
1596 
1597 out:
1598         return ret;
1599 }
1600 
1601 static int spufs_check_valid_dma(struct mfc_dma_command *cmd)
1602 {
1603         pr_debug("queueing DMA %x %llx %x %x %x\n", cmd->lsa,
1604                  cmd->ea, cmd->size, cmd->tag, cmd->cmd);
1605 
1606         switch (cmd->cmd) {
1607         case MFC_PUT_CMD:
1608         case MFC_PUTF_CMD:
1609         case MFC_PUTB_CMD:
1610         case MFC_GET_CMD:
1611         case MFC_GETF_CMD:
1612         case MFC_GETB_CMD:
1613                 break;
1614         default:
1615                 pr_debug("invalid DMA opcode %x\n", cmd->cmd);
1616                 return -EIO;
1617         }
1618 
1619         if ((cmd->lsa & 0xf) != (cmd->ea &0xf)) {
1620                 pr_debug("invalid DMA alignment, ea %llx lsa %x\n",
1621                                 cmd->ea, cmd->lsa);
1622                 return -EIO;
1623         }
1624 
1625         switch (cmd->size & 0xf) {
1626         case 1:
1627                 break;
1628         case 2:
1629                 if (cmd->lsa & 1)
1630                         goto error;
1631                 break;
1632         case 4:
1633                 if (cmd->lsa & 3)
1634                         goto error;
1635                 break;
1636         case 8:
1637                 if (cmd->lsa & 7)
1638                         goto error;
1639                 break;
1640         case 0:
1641                 if (cmd->lsa & 15)
1642                         goto error;
1643                 break;
1644         error:
1645         default:
1646                 pr_debug("invalid DMA alignment %x for size %x\n",
1647                         cmd->lsa & 0xf, cmd->size);
1648                 return -EIO;
1649         }
1650 
1651         if (cmd->size > 16 * 1024) {
1652                 pr_debug("invalid DMA size %x\n", cmd->size);
1653                 return -EIO;
1654         }
1655 
1656         if (cmd->tag & 0xfff0) {
1657                 /* we reserve the higher tag numbers for kernel use */
1658                 pr_debug("invalid DMA tag\n");
1659                 return -EIO;
1660         }
1661 
1662         if (cmd->class) {
1663                 /* not supported in this version */
1664                 pr_debug("invalid DMA class\n");
1665                 return -EIO;
1666         }
1667 
1668         return 0;
1669 }
1670 
1671 static int spu_send_mfc_command(struct spu_context *ctx,
1672                                 struct mfc_dma_command cmd,
1673                                 int *error)
1674 {
1675         *error = ctx->ops->send_mfc_command(ctx, &cmd);
1676         if (*error == -EAGAIN) {
1677                 /* wait for any tag group to complete
1678                    so we have space for the new command */
1679                 ctx->ops->set_mfc_query(ctx, ctx->tagwait, 1);
1680                 /* try again, because the queue might be
1681                    empty again */
1682                 *error = ctx->ops->send_mfc_command(ctx, &cmd);
1683                 if (*error == -EAGAIN)
1684                         return 0;
1685         }
1686         return 1;
1687 }
1688 
1689 static ssize_t spufs_mfc_write(struct file *file, const char __user *buffer,
1690                         size_t size, loff_t *pos)
1691 {
1692         struct spu_context *ctx = file->private_data;
1693         struct mfc_dma_command cmd;
1694         int ret = -EINVAL;
1695 
1696         if (size != sizeof cmd)
1697                 goto out;
1698 
1699         ret = -EFAULT;
1700         if (copy_from_user(&cmd, buffer, sizeof cmd))
1701                 goto out;
1702 
1703         ret = spufs_check_valid_dma(&cmd);
1704         if (ret)
1705                 goto out;
1706 
1707         ret = spu_acquire(ctx);
1708         if (ret)
1709                 goto out;
1710 
1711         ret = spufs_wait(ctx->run_wq, ctx->state == SPU_STATE_RUNNABLE);
1712         if (ret)
1713                 goto out;
1714 
1715         if (file->f_flags & O_NONBLOCK) {
1716                 ret = ctx->ops->send_mfc_command(ctx, &cmd);
1717         } else {
1718                 int status;
1719                 ret = spufs_wait(ctx->mfc_wq,
1720                                  spu_send_mfc_command(ctx, cmd, &status));
1721                 if (ret)
1722                         goto out;
1723                 if (status)
1724                         ret = status;
1725         }
1726 
1727         if (ret)
1728                 goto out_unlock;
1729 
1730         ctx->tagwait |= 1 << cmd.tag;
1731         ret = size;
1732 
1733 out_unlock:
1734         spu_release(ctx);
1735 out:
1736         return ret;
1737 }
1738 
1739 static unsigned int spufs_mfc_poll(struct file *file,poll_table *wait)
1740 {
1741         struct spu_context *ctx = file->private_data;
1742         u32 free_elements, tagstatus;
1743         unsigned int mask;
1744 
1745         poll_wait(file, &ctx->mfc_wq, wait);
1746 
1747         /*
1748          * For now keep this uninterruptible and also ignore the rule
1749          * that poll should not sleep.  Will be fixed later.
1750          */
1751         mutex_lock(&ctx->state_mutex);
1752         ctx->ops->set_mfc_query(ctx, ctx->tagwait, 2);
1753         free_elements = ctx->ops->get_mfc_free_elements(ctx);
1754         tagstatus = ctx->ops->read_mfc_tagstatus(ctx);
1755         spu_release(ctx);
1756 
1757         mask = 0;
1758         if (free_elements & 0xffff)
1759                 mask |= POLLOUT | POLLWRNORM;
1760         if (tagstatus & ctx->tagwait)
1761                 mask |= POLLIN | POLLRDNORM;
1762 
1763         pr_debug("%s: free %d tagstatus %d tagwait %d\n", __func__,
1764                 free_elements, tagstatus, ctx->tagwait);
1765 
1766         return mask;
1767 }
1768 
1769 static int spufs_mfc_flush(struct file *file, fl_owner_t id)
1770 {
1771         struct spu_context *ctx = file->private_data;
1772         int ret;
1773 
1774         ret = spu_acquire(ctx);
1775         if (ret)
1776                 goto out;
1777 #if 0
1778 /* this currently hangs */
1779         ret = spufs_wait(ctx->mfc_wq,
1780                          ctx->ops->set_mfc_query(ctx, ctx->tagwait, 2));
1781         if (ret)
1782                 goto out;
1783         ret = spufs_wait(ctx->mfc_wq,
1784                          ctx->ops->read_mfc_tagstatus(ctx) == ctx->tagwait);
1785         if (ret)
1786                 goto out;
1787 #else
1788         ret = 0;
1789 #endif
1790         spu_release(ctx);
1791 out:
1792         return ret;
1793 }
1794 
1795 static int spufs_mfc_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1796 {
1797         struct inode *inode = file_inode(file);
1798         int err = filemap_write_and_wait_range(inode->i_mapping, start, end);
1799         if (!err) {
1800                 inode_lock(inode);
1801                 err = spufs_mfc_flush(file, NULL);
1802                 inode_unlock(inode);
1803         }
1804         return err;
1805 }
1806 
1807 static int spufs_mfc_fasync(int fd, struct file *file, int on)
1808 {
1809         struct spu_context *ctx = file->private_data;
1810 
1811         return fasync_helper(fd, file, on, &ctx->mfc_fasync);
1812 }
1813 
1814 static const struct file_operations spufs_mfc_fops = {
1815         .open    = spufs_mfc_open,
1816         .release = spufs_mfc_release,
1817         .read    = spufs_mfc_read,
1818         .write   = spufs_mfc_write,
1819         .poll    = spufs_mfc_poll,
1820         .flush   = spufs_mfc_flush,
1821         .fsync   = spufs_mfc_fsync,
1822         .fasync  = spufs_mfc_fasync,
1823         .mmap    = spufs_mfc_mmap,
1824         .llseek  = no_llseek,
1825 };
1826 
1827 static int spufs_npc_set(void *data, u64 val)
1828 {
1829         struct spu_context *ctx = data;
1830         int ret;
1831 
1832         ret = spu_acquire(ctx);
1833         if (ret)
1834                 return ret;
1835         ctx->ops->npc_write(ctx, val);
1836         spu_release(ctx);
1837 
1838         return 0;
1839 }
1840 
1841 static u64 spufs_npc_get(struct spu_context *ctx)
1842 {
1843         return ctx->ops->npc_read(ctx);
1844 }
1845 DEFINE_SPUFS_ATTRIBUTE(spufs_npc_ops, spufs_npc_get, spufs_npc_set,
1846                        "0x%llx\n", SPU_ATTR_ACQUIRE);
1847 
1848 static int spufs_decr_set(void *data, u64 val)
1849 {
1850         struct spu_context *ctx = data;
1851         struct spu_lscsa *lscsa = ctx->csa.lscsa;
1852         int ret;
1853 
1854         ret = spu_acquire_saved(ctx);
1855         if (ret)
1856                 return ret;
1857         lscsa->decr.slot[0] = (u32) val;
1858         spu_release_saved(ctx);
1859 
1860         return 0;
1861 }
1862 
1863 static u64 spufs_decr_get(struct spu_context *ctx)
1864 {
1865         struct spu_lscsa *lscsa = ctx->csa.lscsa;
1866         return lscsa->decr.slot[0];
1867 }
1868 DEFINE_SPUFS_ATTRIBUTE(spufs_decr_ops, spufs_decr_get, spufs_decr_set,
1869                        "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED);
1870 
1871 static int spufs_decr_status_set(void *data, u64 val)
1872 {
1873         struct spu_context *ctx = data;
1874         int ret;
1875 
1876         ret = spu_acquire_saved(ctx);
1877         if (ret)
1878                 return ret;
1879         if (val)
1880                 ctx->csa.priv2.mfc_control_RW |= MFC_CNTL_DECREMENTER_RUNNING;
1881         else
1882                 ctx->csa.priv2.mfc_control_RW &= ~MFC_CNTL_DECREMENTER_RUNNING;
1883         spu_release_saved(ctx);
1884 
1885         return 0;
1886 }
1887 
1888 static u64 spufs_decr_status_get(struct spu_context *ctx)
1889 {
1890         if (ctx->csa.priv2.mfc_control_RW & MFC_CNTL_DECREMENTER_RUNNING)
1891                 return SPU_DECR_STATUS_RUNNING;
1892         else
1893                 return 0;
1894 }
1895 DEFINE_SPUFS_ATTRIBUTE(spufs_decr_status_ops, spufs_decr_status_get,
1896                        spufs_decr_status_set, "0x%llx\n",
1897                        SPU_ATTR_ACQUIRE_SAVED);
1898 
1899 static int spufs_event_mask_set(void *data, u64 val)
1900 {
1901         struct spu_context *ctx = data;
1902         struct spu_lscsa *lscsa = ctx->csa.lscsa;
1903         int ret;
1904 
1905         ret = spu_acquire_saved(ctx);
1906         if (ret)
1907                 return ret;
1908         lscsa->event_mask.slot[0] = (u32) val;
1909         spu_release_saved(ctx);
1910 
1911         return 0;
1912 }
1913 
1914 static u64 spufs_event_mask_get(struct spu_context *ctx)
1915 {
1916         struct spu_lscsa *lscsa = ctx->csa.lscsa;
1917         return lscsa->event_mask.slot[0];
1918 }
1919 
1920 DEFINE_SPUFS_ATTRIBUTE(spufs_event_mask_ops, spufs_event_mask_get,
1921                        spufs_event_mask_set, "0x%llx\n",
1922                        SPU_ATTR_ACQUIRE_SAVED);
1923 
1924 static u64 spufs_event_status_get(struct spu_context *ctx)
1925 {
1926         struct spu_state *state = &ctx->csa;
1927         u64 stat;
1928         stat = state->spu_chnlcnt_RW[0];
1929         if (stat)
1930                 return state->spu_chnldata_RW[0];
1931         return 0;
1932 }
1933 DEFINE_SPUFS_ATTRIBUTE(spufs_event_status_ops, spufs_event_status_get,
1934                        NULL, "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED)
1935 
1936 static int spufs_srr0_set(void *data, u64 val)
1937 {
1938         struct spu_context *ctx = data;
1939         struct spu_lscsa *lscsa = ctx->csa.lscsa;
1940         int ret;
1941 
1942         ret = spu_acquire_saved(ctx);
1943         if (ret)
1944                 return ret;
1945         lscsa->srr0.slot[0] = (u32) val;
1946         spu_release_saved(ctx);
1947 
1948         return 0;
1949 }
1950 
1951 static u64 spufs_srr0_get(struct spu_context *ctx)
1952 {
1953         struct spu_lscsa *lscsa = ctx->csa.lscsa;
1954         return lscsa->srr0.slot[0];
1955 }
1956 DEFINE_SPUFS_ATTRIBUTE(spufs_srr0_ops, spufs_srr0_get, spufs_srr0_set,
1957                        "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED)
1958 
1959 static u64 spufs_id_get(struct spu_context *ctx)
1960 {
1961         u64 num;
1962 
1963         if (ctx->state == SPU_STATE_RUNNABLE)
1964                 num = ctx->spu->number;
1965         else
1966                 num = (unsigned int)-1;
1967 
1968         return num;
1969 }
1970 DEFINE_SPUFS_ATTRIBUTE(spufs_id_ops, spufs_id_get, NULL, "0x%llx\n",
1971                        SPU_ATTR_ACQUIRE)
1972 
1973 static u64 spufs_object_id_get(struct spu_context *ctx)
1974 {
1975         /* FIXME: Should there really be no locking here? */
1976         return ctx->object_id;
1977 }
1978 
1979 static int spufs_object_id_set(void *data, u64 id)
1980 {
1981         struct spu_context *ctx = data;
1982         ctx->object_id = id;
1983 
1984         return 0;
1985 }
1986 
1987 DEFINE_SPUFS_ATTRIBUTE(spufs_object_id_ops, spufs_object_id_get,
1988                        spufs_object_id_set, "0x%llx\n", SPU_ATTR_NOACQUIRE);
1989 
1990 static u64 spufs_lslr_get(struct spu_context *ctx)
1991 {
1992         return ctx->csa.priv2.spu_lslr_RW;
1993 }
1994 DEFINE_SPUFS_ATTRIBUTE(spufs_lslr_ops, spufs_lslr_get, NULL, "0x%llx\n",
1995                        SPU_ATTR_ACQUIRE_SAVED);
1996 
1997 static int spufs_info_open(struct inode *inode, struct file *file)
1998 {
1999         struct spufs_inode_info *i = SPUFS_I(inode);
2000         struct spu_context *ctx = i->i_ctx;
2001         file->private_data = ctx;
2002         return 0;
2003 }
2004 
2005 static int spufs_caps_show(struct seq_file *s, void *private)
2006 {
2007         struct spu_context *ctx = s->private;
2008 
2009         if (!(ctx->flags & SPU_CREATE_NOSCHED))
2010                 seq_puts(s, "sched\n");
2011         if (!(ctx->flags & SPU_CREATE_ISOLATE))
2012                 seq_puts(s, "step\n");
2013         return 0;
2014 }
2015 
2016 static int spufs_caps_open(struct inode *inode, struct file *file)
2017 {
2018         return single_open(file, spufs_caps_show, SPUFS_I(inode)->i_ctx);
2019 }
2020 
2021 static const struct file_operations spufs_caps_fops = {
2022         .open           = spufs_caps_open,
2023         .read           = seq_read,
2024         .llseek         = seq_lseek,
2025         .release        = single_release,
2026 };
2027 
2028 static ssize_t __spufs_mbox_info_read(struct spu_context *ctx,
2029                         char __user *buf, size_t len, loff_t *pos)
2030 {
2031         u32 data;
2032 
2033         /* EOF if there's no entry in the mbox */
2034         if (!(ctx->csa.prob.mb_stat_R & 0x0000ff))
2035                 return 0;
2036 
2037         data = ctx->csa.prob.pu_mb_R;
2038 
2039         return simple_read_from_buffer(buf, len, pos, &data, sizeof data);
2040 }
2041 
2042 static ssize_t spufs_mbox_info_read(struct file *file, char __user *buf,
2043                                    size_t len, loff_t *pos)
2044 {
2045         int ret;
2046         struct spu_context *ctx = file->private_data;
2047 
2048         if (!access_ok(VERIFY_WRITE, buf, len))
2049                 return -EFAULT;
2050 
2051         ret = spu_acquire_saved(ctx);
2052         if (ret)
2053                 return ret;
2054         spin_lock(&ctx->csa.register_lock);
2055         ret = __spufs_mbox_info_read(ctx, buf, len, pos);
2056         spin_unlock(&ctx->csa.register_lock);
2057         spu_release_saved(ctx);
2058 
2059         return ret;
2060 }
2061 
2062 static const struct file_operations spufs_mbox_info_fops = {
2063         .open = spufs_info_open,
2064         .read = spufs_mbox_info_read,
2065         .llseek  = generic_file_llseek,
2066 };
2067 
2068 static ssize_t __spufs_ibox_info_read(struct spu_context *ctx,
2069                                 char __user *buf, size_t len, loff_t *pos)
2070 {
2071         u32 data;
2072 
2073         /* EOF if there's no entry in the ibox */
2074         if (!(ctx->csa.prob.mb_stat_R & 0xff0000))
2075                 return 0;
2076 
2077         data = ctx->csa.priv2.puint_mb_R;
2078 
2079         return simple_read_from_buffer(buf, len, pos, &data, sizeof data);
2080 }
2081 
2082 static ssize_t spufs_ibox_info_read(struct file *file, char __user *buf,
2083                                    size_t len, loff_t *pos)
2084 {
2085         struct spu_context *ctx = file->private_data;
2086         int ret;
2087 
2088         if (!access_ok(VERIFY_WRITE, buf, len))
2089                 return -EFAULT;
2090 
2091         ret = spu_acquire_saved(ctx);
2092         if (ret)
2093                 return ret;
2094         spin_lock(&ctx->csa.register_lock);
2095         ret = __spufs_ibox_info_read(ctx, buf, len, pos);
2096         spin_unlock(&ctx->csa.register_lock);
2097         spu_release_saved(ctx);
2098 
2099         return ret;
2100 }
2101 
2102 static const struct file_operations spufs_ibox_info_fops = {
2103         .open = spufs_info_open,
2104         .read = spufs_ibox_info_read,
2105         .llseek  = generic_file_llseek,
2106 };
2107 
2108 static ssize_t __spufs_wbox_info_read(struct spu_context *ctx,
2109                         char __user *buf, size_t len, loff_t *pos)
2110 {
2111         int i, cnt;
2112         u32 data[4];
2113         u32 wbox_stat;
2114 
2115         wbox_stat = ctx->csa.prob.mb_stat_R;
2116         cnt = 4 - ((wbox_stat & 0x00ff00) >> 8);
2117         for (i = 0; i < cnt; i++) {
2118                 data[i] = ctx->csa.spu_mailbox_data[i];
2119         }
2120 
2121         return simple_read_from_buffer(buf, len, pos, &data,
2122                                 cnt * sizeof(u32));
2123 }
2124 
2125 static ssize_t spufs_wbox_info_read(struct file *file, char __user *buf,
2126                                    size_t len, loff_t *pos)
2127 {
2128         struct spu_context *ctx = file->private_data;
2129         int ret;
2130 
2131         if (!access_ok(VERIFY_WRITE, buf, len))
2132                 return -EFAULT;
2133 
2134         ret = spu_acquire_saved(ctx);
2135         if (ret)
2136                 return ret;
2137         spin_lock(&ctx->csa.register_lock);
2138         ret = __spufs_wbox_info_read(ctx, buf, len, pos);
2139         spin_unlock(&ctx->csa.register_lock);
2140         spu_release_saved(ctx);
2141 
2142         return ret;
2143 }
2144 
2145 static const struct file_operations spufs_wbox_info_fops = {
2146         .open = spufs_info_open,
2147         .read = spufs_wbox_info_read,
2148         .llseek  = generic_file_llseek,
2149 };
2150 
2151 static ssize_t __spufs_dma_info_read(struct spu_context *ctx,
2152                         char __user *buf, size_t len, loff_t *pos)
2153 {
2154         struct spu_dma_info info;
2155         struct mfc_cq_sr *qp, *spuqp;
2156         int i;
2157 
2158         info.dma_info_type = ctx->csa.priv2.spu_tag_status_query_RW;
2159         info.dma_info_mask = ctx->csa.lscsa->tag_mask.slot[0];
2160         info.dma_info_status = ctx->csa.spu_chnldata_RW[24];
2161         info.dma_info_stall_and_notify = ctx->csa.spu_chnldata_RW[25];
2162         info.dma_info_atomic_command_status = ctx->csa.spu_chnldata_RW[27];
2163         for (i = 0; i < 16; i++) {
2164                 qp = &info.dma_info_command_data[i];
2165                 spuqp = &ctx->csa.priv2.spuq[i];
2166 
2167                 qp->mfc_cq_data0_RW = spuqp->mfc_cq_data0_RW;
2168                 qp->mfc_cq_data1_RW = spuqp->mfc_cq_data1_RW;
2169                 qp->mfc_cq_data2_RW = spuqp->mfc_cq_data2_RW;
2170                 qp->mfc_cq_data3_RW = spuqp->mfc_cq_data3_RW;
2171         }
2172 
2173         return simple_read_from_buffer(buf, len, pos, &info,
2174                                 sizeof info);
2175 }
2176 
2177 static ssize_t spufs_dma_info_read(struct file *file, char __user *buf,
2178                               size_t len, loff_t *pos)
2179 {
2180         struct spu_context *ctx = file->private_data;
2181         int ret;
2182 
2183         if (!access_ok(VERIFY_WRITE, buf, len))
2184                 return -EFAULT;
2185 
2186         ret = spu_acquire_saved(ctx);
2187         if (ret)
2188                 return ret;
2189         spin_lock(&ctx->csa.register_lock);
2190         ret = __spufs_dma_info_read(ctx, buf, len, pos);
2191         spin_unlock(&ctx->csa.register_lock);
2192         spu_release_saved(ctx);
2193 
2194         return ret;
2195 }
2196 
2197 static const struct file_operations spufs_dma_info_fops = {
2198         .open = spufs_info_open,
2199         .read = spufs_dma_info_read,
2200         .llseek = no_llseek,
2201 };
2202 
2203 static ssize_t __spufs_proxydma_info_read(struct spu_context *ctx,
2204                         char __user *buf, size_t len, loff_t *pos)
2205 {
2206         struct spu_proxydma_info info;
2207         struct mfc_cq_sr *qp, *puqp;
2208         int ret = sizeof info;
2209         int i;
2210 
2211         if (len < ret)
2212                 return -EINVAL;
2213 
2214         if (!access_ok(VERIFY_WRITE, buf, len))
2215                 return -EFAULT;
2216 
2217         info.proxydma_info_type = ctx->csa.prob.dma_querytype_RW;
2218         info.proxydma_info_mask = ctx->csa.prob.dma_querymask_RW;
2219         info.proxydma_info_status = ctx->csa.prob.dma_tagstatus_R;
2220         for (i = 0; i < 8; i++) {
2221                 qp = &info.proxydma_info_command_data[i];
2222                 puqp = &ctx->csa.priv2.puq[i];
2223 
2224                 qp->mfc_cq_data0_RW = puqp->mfc_cq_data0_RW;
2225                 qp->mfc_cq_data1_RW = puqp->mfc_cq_data1_RW;
2226                 qp->mfc_cq_data2_RW = puqp->mfc_cq_data2_RW;
2227                 qp->mfc_cq_data3_RW = puqp->mfc_cq_data3_RW;
2228         }
2229 
2230         return simple_read_from_buffer(buf, len, pos, &info,
2231                                 sizeof info);
2232 }
2233 
2234 static ssize_t spufs_proxydma_info_read(struct file *file, char __user *buf,
2235                                    size_t len, loff_t *pos)
2236 {
2237         struct spu_context *ctx = file->private_data;
2238         int ret;
2239 
2240         ret = spu_acquire_saved(ctx);
2241         if (ret)
2242                 return ret;
2243         spin_lock(&ctx->csa.register_lock);
2244         ret = __spufs_proxydma_info_read(ctx, buf, len, pos);
2245         spin_unlock(&ctx->csa.register_lock);
2246         spu_release_saved(ctx);
2247 
2248         return ret;
2249 }
2250 
2251 static const struct file_operations spufs_proxydma_info_fops = {
2252         .open = spufs_info_open,
2253         .read = spufs_proxydma_info_read,
2254         .llseek = no_llseek,
2255 };
2256 
2257 static int spufs_show_tid(struct seq_file *s, void *private)
2258 {
2259         struct spu_context *ctx = s->private;
2260 
2261         seq_printf(s, "%d\n", ctx->tid);
2262         return 0;
2263 }
2264 
2265 static int spufs_tid_open(struct inode *inode, struct file *file)
2266 {
2267         return single_open(file, spufs_show_tid, SPUFS_I(inode)->i_ctx);
2268 }
2269 
2270 static const struct file_operations spufs_tid_fops = {
2271         .open           = spufs_tid_open,
2272         .read           = seq_read,
2273         .llseek         = seq_lseek,
2274         .release        = single_release,
2275 };
2276 
2277 static const char *ctx_state_names[] = {
2278         "user", "system", "iowait", "loaded"
2279 };
2280 
2281 static unsigned long long spufs_acct_time(struct spu_context *ctx,
2282                 enum spu_utilization_state state)
2283 {
2284         unsigned long long time = ctx->stats.times[state];
2285 
2286         /*
2287          * In general, utilization statistics are updated by the controlling
2288          * thread as the spu context moves through various well defined
2289          * state transitions, but if the context is lazily loaded its
2290          * utilization statistics are not updated as the controlling thread
2291          * is not tightly coupled with the execution of the spu context.  We
2292          * calculate and apply the time delta from the last recorded state
2293          * of the spu context.
2294          */
2295         if (ctx->spu && ctx->stats.util_state == state) {
2296                 time += ktime_get_ns() - ctx->stats.tstamp;
2297         }
2298 
2299         return time / NSEC_PER_MSEC;
2300 }
2301 
2302 static unsigned long long spufs_slb_flts(struct spu_context *ctx)
2303 {
2304         unsigned long long slb_flts = ctx->stats.slb_flt;
2305 
2306         if (ctx->state == SPU_STATE_RUNNABLE) {
2307                 slb_flts += (ctx->spu->stats.slb_flt -
2308                              ctx->stats.slb_flt_base);
2309         }
2310 
2311         return slb_flts;
2312 }
2313 
2314 static unsigned long long spufs_class2_intrs(struct spu_context *ctx)
2315 {
2316         unsigned long long class2_intrs = ctx->stats.class2_intr;
2317 
2318         if (ctx->state == SPU_STATE_RUNNABLE) {
2319                 class2_intrs += (ctx->spu->stats.class2_intr -
2320                                  ctx->stats.class2_intr_base);
2321         }
2322 
2323         return class2_intrs;
2324 }
2325 
2326 
2327 static int spufs_show_stat(struct seq_file *s, void *private)
2328 {
2329         struct spu_context *ctx = s->private;
2330         int ret;
2331 
2332         ret = spu_acquire(ctx);
2333         if (ret)
2334                 return ret;
2335 
2336         seq_printf(s, "%s %llu %llu %llu %llu "
2337                       "%llu %llu %llu %llu %llu %llu %llu %llu\n",
2338                 ctx_state_names[ctx->stats.util_state],
2339                 spufs_acct_time(ctx, SPU_UTIL_USER),
2340                 spufs_acct_time(ctx, SPU_UTIL_SYSTEM),
2341                 spufs_acct_time(ctx, SPU_UTIL_IOWAIT),
2342                 spufs_acct_time(ctx, SPU_UTIL_IDLE_LOADED),
2343                 ctx->stats.vol_ctx_switch,
2344                 ctx->stats.invol_ctx_switch,
2345                 spufs_slb_flts(ctx),
2346                 ctx->stats.hash_flt,
2347                 ctx->stats.min_flt,
2348                 ctx->stats.maj_flt,
2349                 spufs_class2_intrs(ctx),
2350                 ctx->stats.libassist);
2351         spu_release(ctx);
2352         return 0;
2353 }
2354 
2355 static int spufs_stat_open(struct inode *inode, struct file *file)
2356 {
2357         return single_open(file, spufs_show_stat, SPUFS_I(inode)->i_ctx);
2358 }
2359 
2360 static const struct file_operations spufs_stat_fops = {
2361         .open           = spufs_stat_open,
2362         .read           = seq_read,
2363         .llseek         = seq_lseek,
2364         .release        = single_release,
2365 };
2366 
2367 static inline int spufs_switch_log_used(struct spu_context *ctx)
2368 {
2369         return (ctx->switch_log->head - ctx->switch_log->tail) %
2370                 SWITCH_LOG_BUFSIZE;
2371 }
2372 
2373 static inline int spufs_switch_log_avail(struct spu_context *ctx)
2374 {
2375         return SWITCH_LOG_BUFSIZE - spufs_switch_log_used(ctx);
2376 }
2377 
2378 static int spufs_switch_log_open(struct inode *inode, struct file *file)
2379 {
2380         struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2381         int rc;
2382 
2383         rc = spu_acquire(ctx);
2384         if (rc)
2385                 return rc;
2386 
2387         if (ctx->switch_log) {
2388                 rc = -EBUSY;
2389                 goto out;
2390         }
2391 
2392         ctx->switch_log = kmalloc(sizeof(struct switch_log) +
2393                 SWITCH_LOG_BUFSIZE * sizeof(struct switch_log_entry),
2394                 GFP_KERNEL);
2395 
2396         if (!ctx->switch_log) {
2397                 rc = -ENOMEM;
2398                 goto out;
2399         }
2400 
2401         ctx->switch_log->head = ctx->switch_log->tail = 0;
2402         init_waitqueue_head(&ctx->switch_log->wait);
2403         rc = 0;
2404 
2405 out:
2406         spu_release(ctx);
2407         return rc;
2408 }
2409 
2410 static int spufs_switch_log_release(struct inode *inode, struct file *file)
2411 {
2412         struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2413         int rc;
2414 
2415         rc = spu_acquire(ctx);
2416         if (rc)
2417                 return rc;
2418 
2419         kfree(ctx->switch_log);
2420         ctx->switch_log = NULL;
2421         spu_release(ctx);
2422 
2423         return 0;
2424 }
2425 
2426 static int switch_log_sprint(struct spu_context *ctx, char *tbuf, int n)
2427 {
2428         struct switch_log_entry *p;
2429 
2430         p = ctx->switch_log->log + ctx->switch_log->tail % SWITCH_LOG_BUFSIZE;
2431 
2432         return snprintf(tbuf, n, "%u.%09u %d %u %u %llu\n",
2433                         (unsigned int) p->tstamp.tv_sec,
2434                         (unsigned int) p->tstamp.tv_nsec,
2435                         p->spu_id,
2436                         (unsigned int) p->type,
2437                         (unsigned int) p->val,
2438                         (unsigned long long) p->timebase);
2439 }
2440 
2441 static ssize_t spufs_switch_log_read(struct file *file, char __user *buf,
2442                              size_t len, loff_t *ppos)
2443 {
2444         struct inode *inode = file_inode(file);
2445         struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2446         int error = 0, cnt = 0;
2447 
2448         if (!buf)
2449                 return -EINVAL;
2450 
2451         error = spu_acquire(ctx);
2452         if (error)
2453                 return error;
2454 
2455         while (cnt < len) {
2456                 char tbuf[128];
2457                 int width;
2458 
2459                 if (spufs_switch_log_used(ctx) == 0) {
2460                         if (cnt > 0) {
2461                                 /* If there's data ready to go, we can
2462                                  * just return straight away */
2463                                 break;
2464 
2465                         } else if (file->f_flags & O_NONBLOCK) {
2466                                 error = -EAGAIN;
2467                                 break;
2468 
2469                         } else {
2470                                 /* spufs_wait will drop the mutex and
2471                                  * re-acquire, but since we're in read(), the
2472                                  * file cannot be _released (and so
2473                                  * ctx->switch_log is stable).
2474                                  */
2475                                 error = spufs_wait(ctx->switch_log->wait,
2476                                                 spufs_switch_log_used(ctx) > 0);
2477 
2478                                 /* On error, spufs_wait returns without the
2479                                  * state mutex held */
2480                                 if (error)
2481                                         return error;
2482 
2483                                 /* We may have had entries read from underneath
2484                                  * us while we dropped the mutex in spufs_wait,
2485                                  * so re-check */
2486                                 if (spufs_switch_log_used(ctx) == 0)
2487                                         continue;
2488                         }
2489                 }
2490 
2491                 width = switch_log_sprint(ctx, tbuf, sizeof(tbuf));
2492                 if (width < len)
2493                         ctx->switch_log->tail =
2494                                 (ctx->switch_log->tail + 1) %
2495                                  SWITCH_LOG_BUFSIZE;
2496                 else
2497                         /* If the record is greater than space available return
2498                          * partial buffer (so far) */
2499                         break;
2500 
2501                 error = copy_to_user(buf + cnt, tbuf, width);
2502                 if (error)
2503                         break;
2504                 cnt += width;
2505         }
2506 
2507         spu_release(ctx);
2508 
2509         return cnt == 0 ? error : cnt;
2510 }
2511 
2512 static unsigned int spufs_switch_log_poll(struct file *file, poll_table *wait)
2513 {
2514         struct inode *inode = file_inode(file);
2515         struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2516         unsigned int mask = 0;
2517         int rc;
2518 
2519         poll_wait(file, &ctx->switch_log->wait, wait);
2520 
2521         rc = spu_acquire(ctx);
2522         if (rc)
2523                 return rc;
2524 
2525         if (spufs_switch_log_used(ctx) > 0)
2526                 mask |= POLLIN;
2527 
2528         spu_release(ctx);
2529 
2530         return mask;
2531 }
2532 
2533 static const struct file_operations spufs_switch_log_fops = {
2534         .open           = spufs_switch_log_open,
2535         .read           = spufs_switch_log_read,
2536         .poll           = spufs_switch_log_poll,
2537         .release        = spufs_switch_log_release,
2538         .llseek         = no_llseek,
2539 };
2540 
2541 /**
2542  * Log a context switch event to a switch log reader.
2543  *
2544  * Must be called with ctx->state_mutex held.
2545  */
2546 void spu_switch_log_notify(struct spu *spu, struct spu_context *ctx,
2547                 u32 type, u32 val)
2548 {
2549         if (!ctx->switch_log)
2550                 return;
2551 
2552         if (spufs_switch_log_avail(ctx) > 1) {
2553                 struct switch_log_entry *p;
2554 
2555                 p = ctx->switch_log->log + ctx->switch_log->head;
2556                 ktime_get_ts(&p->tstamp);
2557                 p->timebase = get_tb();
2558                 p->spu_id = spu ? spu->number : -1;
2559                 p->type = type;
2560                 p->val = val;
2561 
2562                 ctx->switch_log->head =
2563                         (ctx->switch_log->head + 1) % SWITCH_LOG_BUFSIZE;
2564         }
2565 
2566         wake_up(&ctx->switch_log->wait);
2567 }
2568 
2569 static int spufs_show_ctx(struct seq_file *s, void *private)
2570 {
2571         struct spu_context *ctx = s->private;
2572         u64 mfc_control_RW;
2573 
2574         mutex_lock(&ctx->state_mutex);
2575         if (ctx->spu) {
2576                 struct spu *spu = ctx->spu;
2577                 struct spu_priv2 __iomem *priv2 = spu->priv2;
2578 
2579                 spin_lock_irq(&spu->register_lock);
2580                 mfc_control_RW = in_be64(&priv2->mfc_control_RW);
2581                 spin_unlock_irq(&spu->register_lock);
2582         } else {
2583                 struct spu_state *csa = &ctx->csa;
2584 
2585                 mfc_control_RW = csa->priv2.mfc_control_RW;
2586         }
2587 
2588         seq_printf(s, "%c flgs(%lx) sflgs(%lx) pri(%d) ts(%d) spu(%02d)"
2589                 " %c %llx %llx %llx %llx %x %x\n",
2590                 ctx->state == SPU_STATE_SAVED ? 'S' : 'R',
2591                 ctx->flags,
2592                 ctx->sched_flags,
2593                 ctx->prio,
2594                 ctx->time_slice,
2595                 ctx->spu ? ctx->spu->number : -1,
2596                 !list_empty(&ctx->rq) ? 'q' : ' ',
2597                 ctx->csa.class_0_pending,
2598                 ctx->csa.class_0_dar,
2599                 ctx->csa.class_1_dsisr,
2600                 mfc_control_RW,
2601                 ctx->ops->runcntl_read(ctx),
2602                 ctx->ops->status_read(ctx));
2603 
2604         mutex_unlock(&ctx->state_mutex);
2605 
2606         return 0;
2607 }
2608 
2609 static int spufs_ctx_open(struct inode *inode, struct file *file)
2610 {
2611         return single_open(file, spufs_show_ctx, SPUFS_I(inode)->i_ctx);
2612 }
2613 
2614 static const struct file_operations spufs_ctx_fops = {
2615         .open           = spufs_ctx_open,
2616         .read           = seq_read,
2617         .llseek         = seq_lseek,
2618         .release        = single_release,
2619 };
2620 
2621 const struct spufs_tree_descr spufs_dir_contents[] = {
2622         { "capabilities", &spufs_caps_fops, 0444, },
2623         { "mem",  &spufs_mem_fops,  0666, LS_SIZE, },
2624         { "regs", &spufs_regs_fops,  0666, sizeof(struct spu_reg128[128]), },
2625         { "mbox", &spufs_mbox_fops, 0444, },
2626         { "ibox", &spufs_ibox_fops, 0444, },
2627         { "wbox", &spufs_wbox_fops, 0222, },
2628         { "mbox_stat", &spufs_mbox_stat_fops, 0444, sizeof(u32), },
2629         { "ibox_stat", &spufs_ibox_stat_fops, 0444, sizeof(u32), },
2630         { "wbox_stat", &spufs_wbox_stat_fops, 0444, sizeof(u32), },
2631         { "signal1", &spufs_signal1_fops, 0666, },
2632         { "signal2", &spufs_signal2_fops, 0666, },
2633         { "signal1_type", &spufs_signal1_type, 0666, },
2634         { "signal2_type", &spufs_signal2_type, 0666, },
2635         { "cntl", &spufs_cntl_fops,  0666, },
2636         { "fpcr", &spufs_fpcr_fops, 0666, sizeof(struct spu_reg128), },
2637         { "lslr", &spufs_lslr_ops, 0444, },
2638         { "mfc", &spufs_mfc_fops, 0666, },
2639         { "mss", &spufs_mss_fops, 0666, },
2640         { "npc", &spufs_npc_ops, 0666, },
2641         { "srr0", &spufs_srr0_ops, 0666, },
2642         { "decr", &spufs_decr_ops, 0666, },
2643         { "decr_status", &spufs_decr_status_ops, 0666, },
2644         { "event_mask", &spufs_event_mask_ops, 0666, },
2645         { "event_status", &spufs_event_status_ops, 0444, },
2646         { "psmap", &spufs_psmap_fops, 0666, SPUFS_PS_MAP_SIZE, },
2647         { "phys-id", &spufs_id_ops, 0666, },
2648         { "object-id", &spufs_object_id_ops, 0666, },
2649         { "mbox_info", &spufs_mbox_info_fops, 0444, sizeof(u32), },
2650         { "ibox_info", &spufs_ibox_info_fops, 0444, sizeof(u32), },
2651         { "wbox_info", &spufs_wbox_info_fops, 0444, sizeof(u32), },
2652         { "dma_info", &spufs_dma_info_fops, 0444,
2653                 sizeof(struct spu_dma_info), },
2654         { "proxydma_info", &spufs_proxydma_info_fops, 0444,
2655                 sizeof(struct spu_proxydma_info)},
2656         { "tid", &spufs_tid_fops, 0444, },
2657         { "stat", &spufs_stat_fops, 0444, },
2658         { "switch_log", &spufs_switch_log_fops, 0444 },
2659         {},
2660 };
2661 
2662 const struct spufs_tree_descr spufs_dir_nosched_contents[] = {
2663         { "capabilities", &spufs_caps_fops, 0444, },
2664         { "mem",  &spufs_mem_fops,  0666, LS_SIZE, },
2665         { "mbox", &spufs_mbox_fops, 0444, },
2666         { "ibox", &spufs_ibox_fops, 0444, },
2667         { "wbox", &spufs_wbox_fops, 0222, },
2668         { "mbox_stat", &spufs_mbox_stat_fops, 0444, sizeof(u32), },
2669         { "ibox_stat", &spufs_ibox_stat_fops, 0444, sizeof(u32), },
2670         { "wbox_stat", &spufs_wbox_stat_fops, 0444, sizeof(u32), },
2671         { "signal1", &spufs_signal1_nosched_fops, 0222, },
2672         { "signal2", &spufs_signal2_nosched_fops, 0222, },
2673         { "signal1_type", &spufs_signal1_type, 0666, },
2674         { "signal2_type", &spufs_signal2_type, 0666, },
2675         { "mss", &spufs_mss_fops, 0666, },
2676         { "mfc", &spufs_mfc_fops, 0666, },
2677         { "cntl", &spufs_cntl_fops,  0666, },
2678         { "npc", &spufs_npc_ops, 0666, },
2679         { "psmap", &spufs_psmap_fops, 0666, SPUFS_PS_MAP_SIZE, },
2680         { "phys-id", &spufs_id_ops, 0666, },
2681         { "object-id", &spufs_object_id_ops, 0666, },
2682         { "tid", &spufs_tid_fops, 0444, },
2683         { "stat", &spufs_stat_fops, 0444, },
2684         {},
2685 };
2686 
2687 const struct spufs_tree_descr spufs_dir_debug_contents[] = {
2688         { ".ctx", &spufs_ctx_fops, 0444, },
2689         {},
2690 };
2691 
2692 const struct spufs_coredump_reader spufs_coredump_read[] = {
2693         { "regs", __spufs_regs_read, NULL, sizeof(struct spu_reg128[128])},
2694         { "fpcr", __spufs_fpcr_read, NULL, sizeof(struct spu_reg128) },
2695         { "lslr", NULL, spufs_lslr_get, 19 },
2696         { "decr", NULL, spufs_decr_get, 19 },
2697         { "decr_status", NULL, spufs_decr_status_get, 19 },
2698         { "mem", __spufs_mem_read, NULL, LS_SIZE, },
2699         { "signal1", __spufs_signal1_read, NULL, sizeof(u32) },
2700         { "signal1_type", NULL, spufs_signal1_type_get, 19 },
2701         { "signal2", __spufs_signal2_read, NULL, sizeof(u32) },
2702         { "signal2_type", NULL, spufs_signal2_type_get, 19 },
2703         { "event_mask", NULL, spufs_event_mask_get, 19 },
2704         { "event_status", NULL, spufs_event_status_get, 19 },
2705         { "mbox_info", __spufs_mbox_info_read, NULL, sizeof(u32) },
2706         { "ibox_info", __spufs_ibox_info_read, NULL, sizeof(u32) },
2707         { "wbox_info", __spufs_wbox_info_read, NULL, 4 * sizeof(u32)},
2708         { "dma_info", __spufs_dma_info_read, NULL, sizeof(struct spu_dma_info)},
2709         { "proxydma_info", __spufs_proxydma_info_read,
2710                            NULL, sizeof(struct spu_proxydma_info)},
2711         { "object-id", NULL, spufs_object_id_get, 19 },
2712         { "npc", NULL, spufs_npc_get, 19 },
2713         { NULL },
2714 };
2715 

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