1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * SPU file system -- file contents
4 *
5 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
6 *
7 * Author: Arnd Bergmann <arndb@de.ibm.com>
8 */
9
10 #undef DEBUG
11
12 #include <linux/coredump.h>
13 #include <linux/fs.h>
14 #include <linux/ioctl.h>
15 #include <linux/export.h>
16 #include <linux/pagemap.h>
17 #include <linux/poll.h>
18 #include <linux/ptrace.h>
19 #include <linux/seq_file.h>
20 #include <linux/slab.h>
21
22 #include <asm/io.h>
23 #include <asm/time.h>
24 #include <asm/spu.h>
25 #include <asm/spu_info.h>
26 #include <linux/uaccess.h>
27
28 #include "spufs.h"
29 #include "sputrace.h"
30
31 #define SPUFS_MMAP_4K (PAGE_SIZE == 0x1000)
32
33 /* Simple attribute files */
34 struct spufs_attr {
35 int (*get)(void *, u64 *);
36 int (*set)(void *, u64);
37 char get_buf[24]; /* enough to store a u64 and "\n\0" */
38 char set_buf[24];
39 void *data;
40 const char *fmt; /* format for read operation */
41 struct mutex mutex; /* protects access to these buffers */
42 };
43
44 static int spufs_attr_open(struct inode *inode, struct file *file,
45 int (*get)(void *, u64 *), int (*set)(void *, u64),
46 const char *fmt)
47 {
48 struct spufs_attr *attr;
49
50 attr = kmalloc(sizeof(*attr), GFP_KERNEL);
51 if (!attr)
52 return -ENOMEM;
53
54 attr->get = get;
55 attr->set = set;
56 attr->data = inode->i_private;
57 attr->fmt = fmt;
58 mutex_init(&attr->mutex);
59 file->private_data = attr;
60
61 return nonseekable_open(inode, file);
62 }
63
64 static int spufs_attr_release(struct inode *inode, struct file *file)
65 {
66 kfree(file->private_data);
67 return 0;
68 }
69
70 static ssize_t spufs_attr_read(struct file *file, char __user *buf,
71 size_t len, loff_t *ppos)
72 {
73 struct spufs_attr *attr;
74 size_t size;
75 ssize_t ret;
76
77 attr = file->private_data;
78 if (!attr->get)
79 return -EACCES;
80
81 ret = mutex_lock_interruptible(&attr->mutex);
82 if (ret)
83 return ret;
84
85 if (*ppos) { /* continued read */
86 size = strlen(attr->get_buf);
87 } else { /* first read */
88 u64 val;
89 ret = attr->get(attr->data, &val);
90 if (ret)
91 goto out;
92
93 size = scnprintf(attr->get_buf, sizeof(attr->get_buf),
94 attr->fmt, (unsigned long long)val);
95 }
96
97 ret = simple_read_from_buffer(buf, len, ppos, attr->get_buf, size);
98 out:
99 mutex_unlock(&attr->mutex);
100 return ret;
101 }
102
103 static ssize_t spufs_attr_write(struct file *file, const char __user *buf,
104 size_t len, loff_t *ppos)
105 {
106 struct spufs_attr *attr;
107 u64 val;
108 size_t size;
109 ssize_t ret;
110
111 attr = file->private_data;
112 if (!attr->set)
113 return -EACCES;
114
115 ret = mutex_lock_interruptible(&attr->mutex);
116 if (ret)
117 return ret;
118
119 ret = -EFAULT;
120 size = min(sizeof(attr->set_buf) - 1, len);
121 if (copy_from_user(attr->set_buf, buf, size))
122 goto out;
123
124 ret = len; /* claim we got the whole input */
125 attr->set_buf[size] = '\0';
126 val = simple_strtol(attr->set_buf, NULL, 0);
127 attr->set(attr->data, val);
128 out:
129 mutex_unlock(&attr->mutex);
130 return ret;
131 }
132
133 static ssize_t spufs_dump_emit(struct coredump_params *cprm, void *buf,
134 size_t size)
135 {
136 if (!dump_emit(cprm, buf, size))
137 return -EIO;
138 return size;
139 }
140
141 #define DEFINE_SPUFS_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
142 static int __fops ## _open(struct inode *inode, struct file *file) \
143 { \
144 __simple_attr_check_format(__fmt, 0ull); \
145 return spufs_attr_open(inode, file, __get, __set, __fmt); \
146 } \
147 static const struct file_operations __fops = { \
148 .open = __fops ## _open, \
149 .release = spufs_attr_release, \
150 .read = spufs_attr_read, \
151 .write = spufs_attr_write, \
152 .llseek = generic_file_llseek, \
153 };
154
155
156 static int
157 spufs_mem_open(struct inode *inode, struct file *file)
158 {
159 struct spufs_inode_info *i = SPUFS_I(inode);
160 struct spu_context *ctx = i->i_ctx;
161
162 mutex_lock(&ctx->mapping_lock);
163 file->private_data = ctx;
164 if (!i->i_openers++)
165 ctx->local_store = inode->i_mapping;
166 mutex_unlock(&ctx->mapping_lock);
167 return 0;
168 }
169
170 static int
171 spufs_mem_release(struct inode *inode, struct file *file)
172 {
173 struct spufs_inode_info *i = SPUFS_I(inode);
174 struct spu_context *ctx = i->i_ctx;
175
176 mutex_lock(&ctx->mapping_lock);
177 if (!--i->i_openers)
178 ctx->local_store = NULL;
179 mutex_unlock(&ctx->mapping_lock);
180 return 0;
181 }
182
183 static ssize_t
184 spufs_mem_dump(struct spu_context *ctx, struct coredump_params *cprm)
185 {
186 return spufs_dump_emit(cprm, ctx->ops->get_ls(ctx), LS_SIZE);
187 }
188
189 static ssize_t
190 spufs_mem_read(struct file *file, char __user *buffer,
191 size_t size, loff_t *pos)
192 {
193 struct spu_context *ctx = file->private_data;
194 ssize_t ret;
195
196 ret = spu_acquire(ctx);
197 if (ret)
198 return ret;
199 ret = simple_read_from_buffer(buffer, size, pos, ctx->ops->get_ls(ctx),
200 LS_SIZE);
201 spu_release(ctx);
202
203 return ret;
204 }
205
206 static ssize_t
207 spufs_mem_write(struct file *file, const char __user *buffer,
208 size_t size, loff_t *ppos)
209 {
210 struct spu_context *ctx = file->private_data;
211 char *local_store;
212 loff_t pos = *ppos;
213 int ret;
214
215 if (pos > LS_SIZE)
216 return -EFBIG;
217
218 ret = spu_acquire(ctx);
219 if (ret)
220 return ret;
221
222 local_store = ctx->ops->get_ls(ctx);
223 size = simple_write_to_buffer(local_store, LS_SIZE, ppos, buffer, size);
224 spu_release(ctx);
225
226 return size;
227 }
228
229 static vm_fault_t
230 spufs_mem_mmap_fault(struct vm_fault *vmf)
231 {
232 struct vm_area_struct *vma = vmf->vma;
233 struct spu_context *ctx = vma->vm_file->private_data;
234 unsigned long pfn, offset;
235 vm_fault_t ret;
236
237 offset = vmf->pgoff << PAGE_SHIFT;
238 if (offset >= LS_SIZE)
239 return VM_FAULT_SIGBUS;
240
241 pr_debug("spufs_mem_mmap_fault address=0x%lx, offset=0x%lx\n",
242 vmf->address, offset);
243
244 if (spu_acquire(ctx))
245 return VM_FAULT_NOPAGE;
246
247 if (ctx->state == SPU_STATE_SAVED) {
248 vma->vm_page_prot = pgprot_cached(vma->vm_page_prot);
249 pfn = vmalloc_to_pfn(ctx->csa.lscsa->ls + offset);
250 } else {
251 vma->vm_page_prot = pgprot_noncached_wc(vma->vm_page_prot);
252 pfn = (ctx->spu->local_store_phys + offset) >> PAGE_SHIFT;
253 }
254 ret = vmf_insert_pfn(vma, vmf->address, pfn);
255
256 spu_release(ctx);
257
258 return ret;
259 }
260
261 static int spufs_mem_mmap_access(struct vm_area_struct *vma,
262 unsigned long address,
263 void *buf, int len, int write)
264 {
265 struct spu_context *ctx = vma->vm_file->private_data;
266 unsigned long offset = address - vma->vm_start;
267 char *local_store;
268
269 if (write && !(vma->vm_flags & VM_WRITE))
270 return -EACCES;
271 if (spu_acquire(ctx))
272 return -EINTR;
273 if ((offset + len) > vma->vm_end)
274 len = vma->vm_end - offset;
275 local_store = ctx->ops->get_ls(ctx);
276 if (write)
277 memcpy_toio(local_store + offset, buf, len);
278 else
279 memcpy_fromio(buf, local_store + offset, len);
280 spu_release(ctx);
281 return len;
282 }
283
284 static const struct vm_operations_struct spufs_mem_mmap_vmops = {
285 .fault = spufs_mem_mmap_fault,
286 .access = spufs_mem_mmap_access,
287 };
288
289 static int spufs_mem_mmap(struct file *file, struct vm_area_struct *vma)
290 {
291 if (!(vma->vm_flags & VM_SHARED))
292 return -EINVAL;
293
294 vm_flags_set(vma, VM_IO | VM_PFNMAP);
295 vma->vm_page_prot = pgprot_noncached_wc(vma->vm_page_prot);
296
297 vma->vm_ops = &spufs_mem_mmap_vmops;
298 return 0;
299 }
300
301 static const struct file_operations spufs_mem_fops = {
302 .open = spufs_mem_open,
303 .release = spufs_mem_release,
304 .read = spufs_mem_read,
305 .write = spufs_mem_write,
306 .llseek = generic_file_llseek,
307 .mmap = spufs_mem_mmap,
308 };
309
310 static vm_fault_t spufs_ps_fault(struct vm_fault *vmf,
311 unsigned long ps_offs,
312 unsigned long ps_size)
313 {
314 struct spu_context *ctx = vmf->vma->vm_file->private_data;
315 unsigned long area, offset = vmf->pgoff << PAGE_SHIFT;
316 int err = 0;
317 vm_fault_t ret = VM_FAULT_NOPAGE;
318
319 spu_context_nospu_trace(spufs_ps_fault__enter, ctx);
320
321 if (offset >= ps_size)
322 return VM_FAULT_SIGBUS;
323
324 if (fatal_signal_pending(current))
325 return VM_FAULT_SIGBUS;
326
327 /*
328 * Because we release the mmap_lock, the context may be destroyed while
329 * we're in spu_wait. Grab an extra reference so it isn't destroyed
330 * in the meantime.
331 */
332 get_spu_context(ctx);
333
334 /*
335 * We have to wait for context to be loaded before we have
336 * pages to hand out to the user, but we don't want to wait
337 * with the mmap_lock held.
338 * It is possible to drop the mmap_lock here, but then we need
339 * to return VM_FAULT_NOPAGE because the mappings may have
340 * hanged.
341 */
342 if (spu_acquire(ctx))
343 goto refault;
344
345 if (ctx->state == SPU_STATE_SAVED) {
346 mmap_read_unlock(current->mm);
347 spu_context_nospu_trace(spufs_ps_fault__sleep, ctx);
348 err = spufs_wait(ctx->run_wq, ctx->state == SPU_STATE_RUNNABLE);
349 spu_context_trace(spufs_ps_fault__wake, ctx, ctx->spu);
350 mmap_read_lock(current->mm);
351 } else {
352 area = ctx->spu->problem_phys + ps_offs;
353 ret = vmf_insert_pfn(vmf->vma, vmf->address,
354 (area + offset) >> PAGE_SHIFT);
355 spu_context_trace(spufs_ps_fault__insert, ctx, ctx->spu);
356 }
357
358 if (!err)
359 spu_release(ctx);
360
361 refault:
362 put_spu_context(ctx);
363 return ret;
364 }
365
366 #if SPUFS_MMAP_4K
367 static vm_fault_t spufs_cntl_mmap_fault(struct vm_fault *vmf)
368 {
369 return spufs_ps_fault(vmf, 0x4000, SPUFS_CNTL_MAP_SIZE);
370 }
371
372 static const struct vm_operations_struct spufs_cntl_mmap_vmops = {
373 .fault = spufs_cntl_mmap_fault,
374 };
375
376 /*
377 * mmap support for problem state control area [0x4000 - 0x4fff].
378 */
379 static int spufs_cntl_mmap(struct file *file, struct vm_area_struct *vma)
380 {
381 if (!(vma->vm_flags & VM_SHARED))
382 return -EINVAL;
383
384 vm_flags_set(vma, VM_IO | VM_PFNMAP);
385 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
386
387 vma->vm_ops = &spufs_cntl_mmap_vmops;
388 return 0;
389 }
390 #else /* SPUFS_MMAP_4K */
391 #define spufs_cntl_mmap NULL
392 #endif /* !SPUFS_MMAP_4K */
393
394 static int spufs_cntl_get(void *data, u64 *val)
395 {
396 struct spu_context *ctx = data;
397 int ret;
398
399 ret = spu_acquire(ctx);
400 if (ret)
401 return ret;
402 *val = ctx->ops->status_read(ctx);
403 spu_release(ctx);
404
405 return 0;
406 }
407
408 static int spufs_cntl_set(void *data, u64 val)
409 {
410 struct spu_context *ctx = data;
411 int ret;
412
413 ret = spu_acquire(ctx);
414 if (ret)
415 return ret;
416 ctx->ops->runcntl_write(ctx, val);
417 spu_release(ctx);
418
419 return 0;
420 }
421
422 static int spufs_cntl_open(struct inode *inode, struct file *file)
423 {
424 struct spufs_inode_info *i = SPUFS_I(inode);
425 struct spu_context *ctx = i->i_ctx;
426
427 mutex_lock(&ctx->mapping_lock);
428 file->private_data = ctx;
429 if (!i->i_openers++)
430 ctx->cntl = inode->i_mapping;
431 mutex_unlock(&ctx->mapping_lock);
432 return simple_attr_open(inode, file, spufs_cntl_get,
433 spufs_cntl_set, "0x%08lx");
434 }
435
436 static int
437 spufs_cntl_release(struct inode *inode, struct file *file)
438 {
439 struct spufs_inode_info *i = SPUFS_I(inode);
440 struct spu_context *ctx = i->i_ctx;
441
442 simple_attr_release(inode, file);
443
444 mutex_lock(&ctx->mapping_lock);
445 if (!--i->i_openers)
446 ctx->cntl = NULL;
447 mutex_unlock(&ctx->mapping_lock);
448 return 0;
449 }
450
451 static const struct file_operations spufs_cntl_fops = {
452 .open = spufs_cntl_open,
453 .release = spufs_cntl_release,
454 .read = simple_attr_read,
455 .write = simple_attr_write,
456 .llseek = no_llseek,
457 .mmap = spufs_cntl_mmap,
458 };
459
460 static int
461 spufs_regs_open(struct inode *inode, struct file *file)
462 {
463 struct spufs_inode_info *i = SPUFS_I(inode);
464 file->private_data = i->i_ctx;
465 return 0;
466 }
467
468 static ssize_t
469 spufs_regs_dump(struct spu_context *ctx, struct coredump_params *cprm)
470 {
471 return spufs_dump_emit(cprm, ctx->csa.lscsa->gprs,
472 sizeof(ctx->csa.lscsa->gprs));
473 }
474
475 static ssize_t
476 spufs_regs_read(struct file *file, char __user *buffer,
477 size_t size, loff_t *pos)
478 {
479 int ret;
480 struct spu_context *ctx = file->private_data;
481
482 /* pre-check for file position: if we'd return EOF, there's no point
483 * causing a deschedule */
484 if (*pos >= sizeof(ctx->csa.lscsa->gprs))
485 return 0;
486
487 ret = spu_acquire_saved(ctx);
488 if (ret)
489 return ret;
490 ret = simple_read_from_buffer(buffer, size, pos, ctx->csa.lscsa->gprs,
491 sizeof(ctx->csa.lscsa->gprs));
492 spu_release_saved(ctx);
493 return ret;
494 }
495
496 static ssize_t
497 spufs_regs_write(struct file *file, const char __user *buffer,
498 size_t size, loff_t *pos)
499 {
500 struct spu_context *ctx = file->private_data;
501 struct spu_lscsa *lscsa = ctx->csa.lscsa;
502 int ret;
503
504 if (*pos >= sizeof(lscsa->gprs))
505 return -EFBIG;
506
507 ret = spu_acquire_saved(ctx);
508 if (ret)
509 return ret;
510
511 size = simple_write_to_buffer(lscsa->gprs, sizeof(lscsa->gprs), pos,
512 buffer, size);
513
514 spu_release_saved(ctx);
515 return size;
516 }
517
518 static const struct file_operations spufs_regs_fops = {
519 .open = spufs_regs_open,
520 .read = spufs_regs_read,
521 .write = spufs_regs_write,
522 .llseek = generic_file_llseek,
523 };
524
525 static ssize_t
526 spufs_fpcr_dump(struct spu_context *ctx, struct coredump_params *cprm)
527 {
528 return spufs_dump_emit(cprm, &ctx->csa.lscsa->fpcr,
529 sizeof(ctx->csa.lscsa->fpcr));
530 }
531
532 static ssize_t
533 spufs_fpcr_read(struct file *file, char __user * buffer,
534 size_t size, loff_t * pos)
535 {
536 int ret;
537 struct spu_context *ctx = file->private_data;
538
539 ret = spu_acquire_saved(ctx);
540 if (ret)
541 return ret;
542 ret = simple_read_from_buffer(buffer, size, pos, &ctx->csa.lscsa->fpcr,
543 sizeof(ctx->csa.lscsa->fpcr));
544 spu_release_saved(ctx);
545 return ret;
546 }
547
548 static ssize_t
549 spufs_fpcr_write(struct file *file, const char __user * buffer,
550 size_t size, loff_t * pos)
551 {
552 struct spu_context *ctx = file->private_data;
553 struct spu_lscsa *lscsa = ctx->csa.lscsa;
554 int ret;
555
556 if (*pos >= sizeof(lscsa->fpcr))
557 return -EFBIG;
558
559 ret = spu_acquire_saved(ctx);
560 if (ret)
561 return ret;
562
563 size = simple_write_to_buffer(&lscsa->fpcr, sizeof(lscsa->fpcr), pos,
564 buffer, size);
565
566 spu_release_saved(ctx);
567 return size;
568 }
569
570 static const struct file_operations spufs_fpcr_fops = {
571 .open = spufs_regs_open,
572 .read = spufs_fpcr_read,
573 .write = spufs_fpcr_write,
574 .llseek = generic_file_llseek,
575 };
576
577 /* generic open function for all pipe-like files */
578 static int spufs_pipe_open(struct inode *inode, struct file *file)
579 {
580 struct spufs_inode_info *i = SPUFS_I(inode);
581 file->private_data = i->i_ctx;
582
583 return stream_open(inode, file);
584 }
585
586 /*
587 * Read as many bytes from the mailbox as possible, until
588 * one of the conditions becomes true:
589 *
590 * - no more data available in the mailbox
591 * - end of the user provided buffer
592 * - end of the mapped area
593 */
594 static ssize_t spufs_mbox_read(struct file *file, char __user *buf,
595 size_t len, loff_t *pos)
596 {
597 struct spu_context *ctx = file->private_data;
598 u32 mbox_data, __user *udata = (void __user *)buf;
599 ssize_t count;
600
601 if (len < 4)
602 return -EINVAL;
603
604 count = spu_acquire(ctx);
605 if (count)
606 return count;
607
608 for (count = 0; (count + 4) <= len; count += 4, udata++) {
609 int ret;
610 ret = ctx->ops->mbox_read(ctx, &mbox_data);
611 if (ret == 0)
612 break;
613
614 /*
615 * at the end of the mapped area, we can fault
616 * but still need to return the data we have
617 * read successfully so far.
618 */
619 ret = put_user(mbox_data, udata);
620 if (ret) {
621 if (!count)
622 count = -EFAULT;
623 break;
624 }
625 }
626 spu_release(ctx);
627
628 if (!count)
629 count = -EAGAIN;
630
631 return count;
632 }
633
634 static const struct file_operations spufs_mbox_fops = {
635 .open = spufs_pipe_open,
636 .read = spufs_mbox_read,
637 .llseek = no_llseek,
638 };
639
640 static ssize_t spufs_mbox_stat_read(struct file *file, char __user *buf,
641 size_t len, loff_t *pos)
642 {
643 struct spu_context *ctx = file->private_data;
644 ssize_t ret;
645 u32 mbox_stat;
646
647 if (len < 4)
648 return -EINVAL;
649
650 ret = spu_acquire(ctx);
651 if (ret)
652 return ret;
653
654 mbox_stat = ctx->ops->mbox_stat_read(ctx) & 0xff;
655
656 spu_release(ctx);
657
658 if (copy_to_user(buf, &mbox_stat, sizeof mbox_stat))
659 return -EFAULT;
660
661 return 4;
662 }
663
664 static const struct file_operations spufs_mbox_stat_fops = {
665 .open = spufs_pipe_open,
666 .read = spufs_mbox_stat_read,
667 .llseek = no_llseek,
668 };
669
670 /* low-level ibox access function */
671 size_t spu_ibox_read(struct spu_context *ctx, u32 *data)
672 {
673 return ctx->ops->ibox_read(ctx, data);
674 }
675
676 /* interrupt-level ibox callback function. */
677 void spufs_ibox_callback(struct spu *spu)
678 {
679 struct spu_context *ctx = spu->ctx;
680
681 if (ctx)
682 wake_up_all(&ctx->ibox_wq);
683 }
684
685 /*
686 * Read as many bytes from the interrupt mailbox as possible, until
687 * one of the conditions becomes true:
688 *
689 * - no more data available in the mailbox
690 * - end of the user provided buffer
691 * - end of the mapped area
692 *
693 * If the file is opened without O_NONBLOCK, we wait here until
694 * any data is available, but return when we have been able to
695 * read something.
696 */
697 static ssize_t spufs_ibox_read(struct file *file, char __user *buf,
698 size_t len, loff_t *pos)
699 {
700 struct spu_context *ctx = file->private_data;
701 u32 ibox_data, __user *udata = (void __user *)buf;
702 ssize_t count;
703
704 if (len < 4)
705 return -EINVAL;
706
707 count = spu_acquire(ctx);
708 if (count)
709 goto out;
710
711 /* wait only for the first element */
712 count = 0;
713 if (file->f_flags & O_NONBLOCK) {
714 if (!spu_ibox_read(ctx, &ibox_data)) {
715 count = -EAGAIN;
716 goto out_unlock;
717 }
718 } else {
719 count = spufs_wait(ctx->ibox_wq, spu_ibox_read(ctx, &ibox_data));
720 if (count)
721 goto out;
722 }
723
724 /* if we can't write at all, return -EFAULT */
725 count = put_user(ibox_data, udata);
726 if (count)
727 goto out_unlock;
728
729 for (count = 4, udata++; (count + 4) <= len; count += 4, udata++) {
730 int ret;
731 ret = ctx->ops->ibox_read(ctx, &ibox_data);
732 if (ret == 0)
733 break;
734 /*
735 * at the end of the mapped area, we can fault
736 * but still need to return the data we have
737 * read successfully so far.
738 */
739 ret = put_user(ibox_data, udata);
740 if (ret)
741 break;
742 }
743
744 out_unlock:
745 spu_release(ctx);
746 out:
747 return count;
748 }
749
750 static __poll_t spufs_ibox_poll(struct file *file, poll_table *wait)
751 {
752 struct spu_context *ctx = file->private_data;
753 __poll_t mask;
754
755 poll_wait(file, &ctx->ibox_wq, wait);
756
757 /*
758 * For now keep this uninterruptible and also ignore the rule
759 * that poll should not sleep. Will be fixed later.
760 */
761 mutex_lock(&ctx->state_mutex);
762 mask = ctx->ops->mbox_stat_poll(ctx, EPOLLIN | EPOLLRDNORM);
763 spu_release(ctx);
764
765 return mask;
766 }
767
768 static const struct file_operations spufs_ibox_fops = {
769 .open = spufs_pipe_open,
770 .read = spufs_ibox_read,
771 .poll = spufs_ibox_poll,
772 .llseek = no_llseek,
773 };
774
775 static ssize_t spufs_ibox_stat_read(struct file *file, char __user *buf,
776 size_t len, loff_t *pos)
777 {
778 struct spu_context *ctx = file->private_data;
779 ssize_t ret;
780 u32 ibox_stat;
781
782 if (len < 4)
783 return -EINVAL;
784
785 ret = spu_acquire(ctx);
786 if (ret)
787 return ret;
788 ibox_stat = (ctx->ops->mbox_stat_read(ctx) >> 16) & 0xff;
789 spu_release(ctx);
790
791 if (copy_to_user(buf, &ibox_stat, sizeof ibox_stat))
792 return -EFAULT;
793
794 return 4;
795 }
796
797 static const struct file_operations spufs_ibox_stat_fops = {
798 .open = spufs_pipe_open,
799 .read = spufs_ibox_stat_read,
800 .llseek = no_llseek,
801 };
802
803 /* low-level mailbox write */
804 size_t spu_wbox_write(struct spu_context *ctx, u32 data)
805 {
806 return ctx->ops->wbox_write(ctx, data);
807 }
808
809 /* interrupt-level wbox callback function. */
810 void spufs_wbox_callback(struct spu *spu)
811 {
812 struct spu_context *ctx = spu->ctx;
813
814 if (ctx)
815 wake_up_all(&ctx->wbox_wq);
816 }
817
818 /*
819 * Write as many bytes to the interrupt mailbox as possible, until
820 * one of the conditions becomes true:
821 *
822 * - the mailbox is full
823 * - end of the user provided buffer
824 * - end of the mapped area
825 *
826 * If the file is opened without O_NONBLOCK, we wait here until
827 * space is available, but return when we have been able to
828 * write something.
829 */
830 static ssize_t spufs_wbox_write(struct file *file, const char __user *buf,
831 size_t len, loff_t *pos)
832 {
833 struct spu_context *ctx = file->private_data;
834 u32 wbox_data, __user *udata = (void __user *)buf;
835 ssize_t count;
836
837 if (len < 4)
838 return -EINVAL;
839
840 if (get_user(wbox_data, udata))
841 return -EFAULT;
842
843 count = spu_acquire(ctx);
844 if (count)
845 goto out;
846
847 /*
848 * make sure we can at least write one element, by waiting
849 * in case of !O_NONBLOCK
850 */
851 count = 0;
852 if (file->f_flags & O_NONBLOCK) {
853 if (!spu_wbox_write(ctx, wbox_data)) {
854 count = -EAGAIN;
855 goto out_unlock;
856 }
857 } else {
858 count = spufs_wait(ctx->wbox_wq, spu_wbox_write(ctx, wbox_data));
859 if (count)
860 goto out;
861 }
862
863
864 /* write as much as possible */
865 for (count = 4, udata++; (count + 4) <= len; count += 4, udata++) {
866 int ret;
867 ret = get_user(wbox_data, udata);
868 if (ret)
869 break;
870
871 ret = spu_wbox_write(ctx, wbox_data);
872 if (ret == 0)
873 break;
874 }
875
876 out_unlock:
877 spu_release(ctx);
878 out:
879 return count;
880 }
881
882 static __poll_t spufs_wbox_poll(struct file *file, poll_table *wait)
883 {
884 struct spu_context *ctx = file->private_data;
885 __poll_t mask;
886
887 poll_wait(file, &ctx->wbox_wq, wait);
888
889 /*
890 * For now keep this uninterruptible and also ignore the rule
891 * that poll should not sleep. Will be fixed later.
892 */
893 mutex_lock(&ctx->state_mutex);
894 mask = ctx->ops->mbox_stat_poll(ctx, EPOLLOUT | EPOLLWRNORM);
895 spu_release(ctx);
896
897 return mask;
898 }
899
900 static const struct file_operations spufs_wbox_fops = {
901 .open = spufs_pipe_open,
902 .write = spufs_wbox_write,
903 .poll = spufs_wbox_poll,
904 .llseek = no_llseek,
905 };
906
907 static ssize_t spufs_wbox_stat_read(struct file *file, char __user *buf,
908 size_t len, loff_t *pos)
909 {
910 struct spu_context *ctx = file->private_data;
911 ssize_t ret;
912 u32 wbox_stat;
913
914 if (len < 4)
915 return -EINVAL;
916
917 ret = spu_acquire(ctx);
918 if (ret)
919 return ret;
920 wbox_stat = (ctx->ops->mbox_stat_read(ctx) >> 8) & 0xff;
921 spu_release(ctx);
922
923 if (copy_to_user(buf, &wbox_stat, sizeof wbox_stat))
924 return -EFAULT;
925
926 return 4;
927 }
928
929 static const struct file_operations spufs_wbox_stat_fops = {
930 .open = spufs_pipe_open,
931 .read = spufs_wbox_stat_read,
932 .llseek = no_llseek,
933 };
934
935 static int spufs_signal1_open(struct inode *inode, struct file *file)
936 {
937 struct spufs_inode_info *i = SPUFS_I(inode);
938 struct spu_context *ctx = i->i_ctx;
939
940 mutex_lock(&ctx->mapping_lock);
941 file->private_data = ctx;
942 if (!i->i_openers++)
943 ctx->signal1 = inode->i_mapping;
944 mutex_unlock(&ctx->mapping_lock);
945 return nonseekable_open(inode, file);
946 }
947
948 static int
949 spufs_signal1_release(struct inode *inode, struct file *file)
950 {
951 struct spufs_inode_info *i = SPUFS_I(inode);
952 struct spu_context *ctx = i->i_ctx;
953
954 mutex_lock(&ctx->mapping_lock);
955 if (!--i->i_openers)
956 ctx->signal1 = NULL;
957 mutex_unlock(&ctx->mapping_lock);
958 return 0;
959 }
960
961 static ssize_t spufs_signal1_dump(struct spu_context *ctx,
962 struct coredump_params *cprm)
963 {
964 if (!ctx->csa.spu_chnlcnt_RW[3])
965 return 0;
966 return spufs_dump_emit(cprm, &ctx->csa.spu_chnldata_RW[3],
967 sizeof(ctx->csa.spu_chnldata_RW[3]));
968 }
969
970 static ssize_t __spufs_signal1_read(struct spu_context *ctx, char __user *buf,
971 size_t len)
972 {
973 if (len < sizeof(ctx->csa.spu_chnldata_RW[3]))
974 return -EINVAL;
975 if (!ctx->csa.spu_chnlcnt_RW[3])
976 return 0;
977 if (copy_to_user(buf, &ctx->csa.spu_chnldata_RW[3],
978 sizeof(ctx->csa.spu_chnldata_RW[3])))
979 return -EFAULT;
980 return sizeof(ctx->csa.spu_chnldata_RW[3]);
981 }
982
983 static ssize_t spufs_signal1_read(struct file *file, char __user *buf,
984 size_t len, loff_t *pos)
985 {
986 int ret;
987 struct spu_context *ctx = file->private_data;
988
989 ret = spu_acquire_saved(ctx);
990 if (ret)
991 return ret;
992 ret = __spufs_signal1_read(ctx, buf, len);
993 spu_release_saved(ctx);
994
995 return ret;
996 }
997
998 static ssize_t spufs_signal1_write(struct file *file, const char __user *buf,
999 size_t len, loff_t *pos)
1000 {
1001 struct spu_context *ctx;
1002 ssize_t ret;
1003 u32 data;
1004
1005 ctx = file->private_data;
1006
1007 if (len < 4)
1008 return -EINVAL;
1009
1010 if (copy_from_user(&data, buf, 4))
1011 return -EFAULT;
1012
1013 ret = spu_acquire(ctx);
1014 if (ret)
1015 return ret;
1016 ctx->ops->signal1_write(ctx, data);
1017 spu_release(ctx);
1018
1019 return 4;
1020 }
1021
1022 static vm_fault_t
1023 spufs_signal1_mmap_fault(struct vm_fault *vmf)
1024 {
1025 #if SPUFS_SIGNAL_MAP_SIZE == 0x1000
1026 return spufs_ps_fault(vmf, 0x14000, SPUFS_SIGNAL_MAP_SIZE);
1027 #elif SPUFS_SIGNAL_MAP_SIZE == 0x10000
1028 /* For 64k pages, both signal1 and signal2 can be used to mmap the whole
1029 * signal 1 and 2 area
1030 */
1031 return spufs_ps_fault(vmf, 0x10000, SPUFS_SIGNAL_MAP_SIZE);
1032 #else
1033 #error unsupported page size
1034 #endif
1035 }
1036
1037 static const struct vm_operations_struct spufs_signal1_mmap_vmops = {
1038 .fault = spufs_signal1_mmap_fault,
1039 };
1040
1041 static int spufs_signal1_mmap(struct file *file, struct vm_area_struct *vma)
1042 {
1043 if (!(vma->vm_flags & VM_SHARED))
1044 return -EINVAL;
1045
1046 vm_flags_set(vma, VM_IO | VM_PFNMAP);
1047 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1048
1049 vma->vm_ops = &spufs_signal1_mmap_vmops;
1050 return 0;
1051 }
1052
1053 static const struct file_operations spufs_signal1_fops = {
1054 .open = spufs_signal1_open,
1055 .release = spufs_signal1_release,
1056 .read = spufs_signal1_read,
1057 .write = spufs_signal1_write,
1058 .mmap = spufs_signal1_mmap,
1059 .llseek = no_llseek,
1060 };
1061
1062 static const struct file_operations spufs_signal1_nosched_fops = {
1063 .open = spufs_signal1_open,
1064 .release = spufs_signal1_release,
1065 .write = spufs_signal1_write,
1066 .mmap = spufs_signal1_mmap,
1067 .llseek = no_llseek,
1068 };
1069
1070 static int spufs_signal2_open(struct inode *inode, struct file *file)
1071 {
1072 struct spufs_inode_info *i = SPUFS_I(inode);
1073 struct spu_context *ctx = i->i_ctx;
1074
1075 mutex_lock(&ctx->mapping_lock);
1076 file->private_data = ctx;
1077 if (!i->i_openers++)
1078 ctx->signal2 = inode->i_mapping;
1079 mutex_unlock(&ctx->mapping_lock);
1080 return nonseekable_open(inode, file);
1081 }
1082
1083 static int
1084 spufs_signal2_release(struct inode *inode, struct file *file)
1085 {
1086 struct spufs_inode_info *i = SPUFS_I(inode);
1087 struct spu_context *ctx = i->i_ctx;
1088
1089 mutex_lock(&ctx->mapping_lock);
1090 if (!--i->i_openers)
1091 ctx->signal2 = NULL;
1092 mutex_unlock(&ctx->mapping_lock);
1093 return 0;
1094 }
1095
1096 static ssize_t spufs_signal2_dump(struct spu_context *ctx,
1097 struct coredump_params *cprm)
1098 {
1099 if (!ctx->csa.spu_chnlcnt_RW[4])
1100 return 0;
1101 return spufs_dump_emit(cprm, &ctx->csa.spu_chnldata_RW[4],
1102 sizeof(ctx->csa.spu_chnldata_RW[4]));
1103 }
1104
1105 static ssize_t __spufs_signal2_read(struct spu_context *ctx, char __user *buf,
1106 size_t len)
1107 {
1108 if (len < sizeof(ctx->csa.spu_chnldata_RW[4]))
1109 return -EINVAL;
1110 if (!ctx->csa.spu_chnlcnt_RW[4])
1111 return 0;
1112 if (copy_to_user(buf, &ctx->csa.spu_chnldata_RW[4],
1113 sizeof(ctx->csa.spu_chnldata_RW[4])))
1114 return -EFAULT;
1115 return sizeof(ctx->csa.spu_chnldata_RW[4]);
1116 }
1117
1118 static ssize_t spufs_signal2_read(struct file *file, char __user *buf,
1119 size_t len, loff_t *pos)
1120 {
1121 struct spu_context *ctx = file->private_data;
1122 int ret;
1123
1124 ret = spu_acquire_saved(ctx);
1125 if (ret)
1126 return ret;
1127 ret = __spufs_signal2_read(ctx, buf, len);
1128 spu_release_saved(ctx);
1129
1130 return ret;
1131 }
1132
1133 static ssize_t spufs_signal2_write(struct file *file, const char __user *buf,
1134 size_t len, loff_t *pos)
1135 {
1136 struct spu_context *ctx;
1137 ssize_t ret;
1138 u32 data;
1139
1140 ctx = file->private_data;
1141
1142 if (len < 4)
1143 return -EINVAL;
1144
1145 if (copy_from_user(&data, buf, 4))
1146 return -EFAULT;
1147
1148 ret = spu_acquire(ctx);
1149 if (ret)
1150 return ret;
1151 ctx->ops->signal2_write(ctx, data);
1152 spu_release(ctx);
1153
1154 return 4;
1155 }
1156
1157 #if SPUFS_MMAP_4K
1158 static vm_fault_t
1159 spufs_signal2_mmap_fault(struct vm_fault *vmf)
1160 {
1161 #if SPUFS_SIGNAL_MAP_SIZE == 0x1000
1162 return spufs_ps_fault(vmf, 0x1c000, SPUFS_SIGNAL_MAP_SIZE);
1163 #elif SPUFS_SIGNAL_MAP_SIZE == 0x10000
1164 /* For 64k pages, both signal1 and signal2 can be used to mmap the whole
1165 * signal 1 and 2 area
1166 */
1167 return spufs_ps_fault(vmf, 0x10000, SPUFS_SIGNAL_MAP_SIZE);
1168 #else
1169 #error unsupported page size
1170 #endif
1171 }
1172
1173 static const struct vm_operations_struct spufs_signal2_mmap_vmops = {
1174 .fault = spufs_signal2_mmap_fault,
1175 };
1176
1177 static int spufs_signal2_mmap(struct file *file, struct vm_area_struct *vma)
1178 {
1179 if (!(vma->vm_flags & VM_SHARED))
1180 return -EINVAL;
1181
1182 vm_flags_set(vma, VM_IO | VM_PFNMAP);
1183 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1184
1185 vma->vm_ops = &spufs_signal2_mmap_vmops;
1186 return 0;
1187 }
1188 #else /* SPUFS_MMAP_4K */
1189 #define spufs_signal2_mmap NULL
1190 #endif /* !SPUFS_MMAP_4K */
1191
1192 static const struct file_operations spufs_signal2_fops = {
1193 .open = spufs_signal2_open,
1194 .release = spufs_signal2_release,
1195 .read = spufs_signal2_read,
1196 .write = spufs_signal2_write,
1197 .mmap = spufs_signal2_mmap,
1198 .llseek = no_llseek,
1199 };
1200
1201 static const struct file_operations spufs_signal2_nosched_fops = {
1202 .open = spufs_signal2_open,
1203 .release = spufs_signal2_release,
1204 .write = spufs_signal2_write,
1205 .mmap = spufs_signal2_mmap,
1206 .llseek = no_llseek,
1207 };
1208
1209 /*
1210 * This is a wrapper around DEFINE_SIMPLE_ATTRIBUTE which does the
1211 * work of acquiring (or not) the SPU context before calling through
1212 * to the actual get routine. The set routine is called directly.
1213 */
1214 #define SPU_ATTR_NOACQUIRE 0
1215 #define SPU_ATTR_ACQUIRE 1
1216 #define SPU_ATTR_ACQUIRE_SAVED 2
1217
1218 #define DEFINE_SPUFS_ATTRIBUTE(__name, __get, __set, __fmt, __acquire) \
1219 static int __##__get(void *data, u64 *val) \
1220 { \
1221 struct spu_context *ctx = data; \
1222 int ret = 0; \
1223 \
1224 if (__acquire == SPU_ATTR_ACQUIRE) { \
1225 ret = spu_acquire(ctx); \
1226 if (ret) \
1227 return ret; \
1228 *val = __get(ctx); \
1229 spu_release(ctx); \
1230 } else if (__acquire == SPU_ATTR_ACQUIRE_SAVED) { \
1231 ret = spu_acquire_saved(ctx); \
1232 if (ret) \
1233 return ret; \
1234 *val = __get(ctx); \
1235 spu_release_saved(ctx); \
1236 } else \
1237 *val = __get(ctx); \
1238 \
1239 return 0; \
1240 } \
1241 DEFINE_SPUFS_SIMPLE_ATTRIBUTE(__name, __##__get, __set, __fmt);
1242
1243 static int spufs_signal1_type_set(void *data, u64 val)
1244 {
1245 struct spu_context *ctx = data;
1246 int ret;
1247
1248 ret = spu_acquire(ctx);
1249 if (ret)
1250 return ret;
1251 ctx->ops->signal1_type_set(ctx, val);
1252 spu_release(ctx);
1253
1254 return 0;
1255 }
1256
1257 static u64 spufs_signal1_type_get(struct spu_context *ctx)
1258 {
1259 return ctx->ops->signal1_type_get(ctx);
1260 }
1261 DEFINE_SPUFS_ATTRIBUTE(spufs_signal1_type, spufs_signal1_type_get,
1262 spufs_signal1_type_set, "%llu\n", SPU_ATTR_ACQUIRE);
1263
1264
1265 static int spufs_signal2_type_set(void *data, u64 val)
1266 {
1267 struct spu_context *ctx = data;
1268 int ret;
1269
1270 ret = spu_acquire(ctx);
1271 if (ret)
1272 return ret;
1273 ctx->ops->signal2_type_set(ctx, val);
1274 spu_release(ctx);
1275
1276 return 0;
1277 }
1278
1279 static u64 spufs_signal2_type_get(struct spu_context *ctx)
1280 {
1281 return ctx->ops->signal2_type_get(ctx);
1282 }
1283 DEFINE_SPUFS_ATTRIBUTE(spufs_signal2_type, spufs_signal2_type_get,
1284 spufs_signal2_type_set, "%llu\n", SPU_ATTR_ACQUIRE);
1285
1286 #if SPUFS_MMAP_4K
1287 static vm_fault_t
1288 spufs_mss_mmap_fault(struct vm_fault *vmf)
1289 {
1290 return spufs_ps_fault(vmf, 0x0000, SPUFS_MSS_MAP_SIZE);
1291 }
1292
1293 static const struct vm_operations_struct spufs_mss_mmap_vmops = {
1294 .fault = spufs_mss_mmap_fault,
1295 };
1296
1297 /*
1298 * mmap support for problem state MFC DMA area [0x0000 - 0x0fff].
1299 */
1300 static int spufs_mss_mmap(struct file *file, struct vm_area_struct *vma)
1301 {
1302 if (!(vma->vm_flags & VM_SHARED))
1303 return -EINVAL;
1304
1305 vm_flags_set(vma, VM_IO | VM_PFNMAP);
1306 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1307
1308 vma->vm_ops = &spufs_mss_mmap_vmops;
1309 return 0;
1310 }
1311 #else /* SPUFS_MMAP_4K */
1312 #define spufs_mss_mmap NULL
1313 #endif /* !SPUFS_MMAP_4K */
1314
1315 static int spufs_mss_open(struct inode *inode, struct file *file)
1316 {
1317 struct spufs_inode_info *i = SPUFS_I(inode);
1318 struct spu_context *ctx = i->i_ctx;
1319
1320 file->private_data = i->i_ctx;
1321
1322 mutex_lock(&ctx->mapping_lock);
1323 if (!i->i_openers++)
1324 ctx->mss = inode->i_mapping;
1325 mutex_unlock(&ctx->mapping_lock);
1326 return nonseekable_open(inode, file);
1327 }
1328
1329 static int
1330 spufs_mss_release(struct inode *inode, struct file *file)
1331 {
1332 struct spufs_inode_info *i = SPUFS_I(inode);
1333 struct spu_context *ctx = i->i_ctx;
1334
1335 mutex_lock(&ctx->mapping_lock);
1336 if (!--i->i_openers)
1337 ctx->mss = NULL;
1338 mutex_unlock(&ctx->mapping_lock);
1339 return 0;
1340 }
1341
1342 static const struct file_operations spufs_mss_fops = {
1343 .open = spufs_mss_open,
1344 .release = spufs_mss_release,
1345 .mmap = spufs_mss_mmap,
1346 .llseek = no_llseek,
1347 };
1348
1349 static vm_fault_t
1350 spufs_psmap_mmap_fault(struct vm_fault *vmf)
1351 {
1352 return spufs_ps_fault(vmf, 0x0000, SPUFS_PS_MAP_SIZE);
1353 }
1354
1355 static const struct vm_operations_struct spufs_psmap_mmap_vmops = {
1356 .fault = spufs_psmap_mmap_fault,
1357 };
1358
1359 /*
1360 * mmap support for full problem state area [0x00000 - 0x1ffff].
1361 */
1362 static int spufs_psmap_mmap(struct file *file, struct vm_area_struct *vma)
1363 {
1364 if (!(vma->vm_flags & VM_SHARED))
1365 return -EINVAL;
1366
1367 vm_flags_set(vma, VM_IO | VM_PFNMAP);
1368 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1369
1370 vma->vm_ops = &spufs_psmap_mmap_vmops;
1371 return 0;
1372 }
1373
1374 static int spufs_psmap_open(struct inode *inode, struct file *file)
1375 {
1376 struct spufs_inode_info *i = SPUFS_I(inode);
1377 struct spu_context *ctx = i->i_ctx;
1378
1379 mutex_lock(&ctx->mapping_lock);
1380 file->private_data = i->i_ctx;
1381 if (!i->i_openers++)
1382 ctx->psmap = inode->i_mapping;
1383 mutex_unlock(&ctx->mapping_lock);
1384 return nonseekable_open(inode, file);
1385 }
1386
1387 static int
1388 spufs_psmap_release(struct inode *inode, struct file *file)
1389 {
1390 struct spufs_inode_info *i = SPUFS_I(inode);
1391 struct spu_context *ctx = i->i_ctx;
1392
1393 mutex_lock(&ctx->mapping_lock);
1394 if (!--i->i_openers)
1395 ctx->psmap = NULL;
1396 mutex_unlock(&ctx->mapping_lock);
1397 return 0;
1398 }
1399
1400 static const struct file_operations spufs_psmap_fops = {
1401 .open = spufs_psmap_open,
1402 .release = spufs_psmap_release,
1403 .mmap = spufs_psmap_mmap,
1404 .llseek = no_llseek,
1405 };
1406
1407
1408 #if SPUFS_MMAP_4K
1409 static vm_fault_t
1410 spufs_mfc_mmap_fault(struct vm_fault *vmf)
1411 {
1412 return spufs_ps_fault(vmf, 0x3000, SPUFS_MFC_MAP_SIZE);
1413 }
1414
1415 static const struct vm_operations_struct spufs_mfc_mmap_vmops = {
1416 .fault = spufs_mfc_mmap_fault,
1417 };
1418
1419 /*
1420 * mmap support for problem state MFC DMA area [0x0000 - 0x0fff].
1421 */
1422 static int spufs_mfc_mmap(struct file *file, struct vm_area_struct *vma)
1423 {
1424 if (!(vma->vm_flags & VM_SHARED))
1425 return -EINVAL;
1426
1427 vm_flags_set(vma, VM_IO | VM_PFNMAP);
1428 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1429
1430 vma->vm_ops = &spufs_mfc_mmap_vmops;
1431 return 0;
1432 }
1433 #else /* SPUFS_MMAP_4K */
1434 #define spufs_mfc_mmap NULL
1435 #endif /* !SPUFS_MMAP_4K */
1436
1437 static int spufs_mfc_open(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 /* we don't want to deal with DMA into other processes */
1443 if (ctx->owner != current->mm)
1444 return -EINVAL;
1445
1446 if (atomic_read(&inode->i_count) != 1)
1447 return -EBUSY;
1448
1449 mutex_lock(&ctx->mapping_lock);
1450 file->private_data = ctx;
1451 if (!i->i_openers++)
1452 ctx->mfc = inode->i_mapping;
1453 mutex_unlock(&ctx->mapping_lock);
1454 return nonseekable_open(inode, file);
1455 }
1456
1457 static int
1458 spufs_mfc_release(struct inode *inode, struct file *file)
1459 {
1460 struct spufs_inode_info *i = SPUFS_I(inode);
1461 struct spu_context *ctx = i->i_ctx;
1462
1463 mutex_lock(&ctx->mapping_lock);
1464 if (!--i->i_openers)
1465 ctx->mfc = NULL;
1466 mutex_unlock(&ctx->mapping_lock);
1467 return 0;
1468 }
1469
1470 /* interrupt-level mfc callback function. */
1471 void spufs_mfc_callback(struct spu *spu)
1472 {
1473 struct spu_context *ctx = spu->ctx;
1474
1475 if (ctx)
1476 wake_up_all(&ctx->mfc_wq);
1477 }
1478
1479 static int spufs_read_mfc_tagstatus(struct spu_context *ctx, u32 *status)
1480 {
1481 /* See if there is one tag group is complete */
1482 /* FIXME we need locking around tagwait */
1483 *status = ctx->ops->read_mfc_tagstatus(ctx) & ctx->tagwait;
1484 ctx->tagwait &= ~*status;
1485 if (*status)
1486 return 1;
1487
1488 /* enable interrupt waiting for any tag group,
1489 may silently fail if interrupts are already enabled */
1490 ctx->ops->set_mfc_query(ctx, ctx->tagwait, 1);
1491 return 0;
1492 }
1493
1494 static ssize_t spufs_mfc_read(struct file *file, char __user *buffer,
1495 size_t size, loff_t *pos)
1496 {
1497 struct spu_context *ctx = file->private_data;
1498 int ret = -EINVAL;
1499 u32 status;
1500
1501 if (size != 4)
1502 goto out;
1503
1504 ret = spu_acquire(ctx);
1505 if (ret)
1506 return ret;
1507
1508 ret = -EINVAL;
1509 if (file->f_flags & O_NONBLOCK) {
1510 status = ctx->ops->read_mfc_tagstatus(ctx);
1511 if (!(status & ctx->tagwait))
1512 ret = -EAGAIN;
1513 else
1514 /* XXX(hch): shouldn't we clear ret here? */
1515 ctx->tagwait &= ~status;
1516 } else {
1517 ret = spufs_wait(ctx->mfc_wq,
1518 spufs_read_mfc_tagstatus(ctx, &status));
1519 if (ret)
1520 goto out;
1521 }
1522 spu_release(ctx);
1523
1524 ret = 4;
1525 if (copy_to_user(buffer, &status, 4))
1526 ret = -EFAULT;
1527
1528 out:
1529 return ret;
1530 }
1531
1532 static int spufs_check_valid_dma(struct mfc_dma_command *cmd)
1533 {
1534 pr_debug("queueing DMA %x %llx %x %x %x\n", cmd->lsa,
1535 cmd->ea, cmd->size, cmd->tag, cmd->cmd);
1536
1537 switch (cmd->cmd) {
1538 case MFC_PUT_CMD:
1539 case MFC_PUTF_CMD:
1540 case MFC_PUTB_CMD:
1541 case MFC_GET_CMD:
1542 case MFC_GETF_CMD:
1543 case MFC_GETB_CMD:
1544 break;
1545 default:
1546 pr_debug("invalid DMA opcode %x\n", cmd->cmd);
1547 return -EIO;
1548 }
1549
1550 if ((cmd->lsa & 0xf) != (cmd->ea &0xf)) {
1551 pr_debug("invalid DMA alignment, ea %llx lsa %x\n",
1552 cmd->ea, cmd->lsa);
1553 return -EIO;
1554 }
1555
1556 switch (cmd->size & 0xf) {
1557 case 1:
1558 break;
1559 case 2:
1560 if (cmd->lsa & 1)
1561 goto error;
1562 break;
1563 case 4:
1564 if (cmd->lsa & 3)
1565 goto error;
1566 break;
1567 case 8:
1568 if (cmd->lsa & 7)
1569 goto error;
1570 break;
1571 case 0:
1572 if (cmd->lsa & 15)
1573 goto error;
1574 break;
1575 error:
1576 default:
1577 pr_debug("invalid DMA alignment %x for size %x\n",
1578 cmd->lsa & 0xf, cmd->size);
1579 return -EIO;
1580 }
1581
1582 if (cmd->size > 16 * 1024) {
1583 pr_debug("invalid DMA size %x\n", cmd->size);
1584 return -EIO;
1585 }
1586
1587 if (cmd->tag & 0xfff0) {
1588 /* we reserve the higher tag numbers for kernel use */
1589 pr_debug("invalid DMA tag\n");
1590 return -EIO;
1591 }
1592
1593 if (cmd->class) {
1594 /* not supported in this version */
1595 pr_debug("invalid DMA class\n");
1596 return -EIO;
1597 }
1598
1599 return 0;
1600 }
1601
1602 static int spu_send_mfc_command(struct spu_context *ctx,
1603 struct mfc_dma_command cmd,
1604 int *error)
1605 {
1606 *error = ctx->ops->send_mfc_command(ctx, &cmd);
1607 if (*error == -EAGAIN) {
1608 /* wait for any tag group to complete
1609 so we have space for the new command */
1610 ctx->ops->set_mfc_query(ctx, ctx->tagwait, 1);
1611 /* try again, because the queue might be
1612 empty again */
1613 *error = ctx->ops->send_mfc_command(ctx, &cmd);
1614 if (*error == -EAGAIN)
1615 return 0;
1616 }
1617 return 1;
1618 }
1619
1620 static ssize_t spufs_mfc_write(struct file *file, const char __user *buffer,
1621 size_t size, loff_t *pos)
1622 {
1623 struct spu_context *ctx = file->private_data;
1624 struct mfc_dma_command cmd;
1625 int ret = -EINVAL;
1626
1627 if (size != sizeof cmd)
1628 goto out;
1629
1630 ret = -EFAULT;
1631 if (copy_from_user(&cmd, buffer, sizeof cmd))
1632 goto out;
1633
1634 ret = spufs_check_valid_dma(&cmd);
1635 if (ret)
1636 goto out;
1637
1638 ret = spu_acquire(ctx);
1639 if (ret)
1640 goto out;
1641
1642 ret = spufs_wait(ctx->run_wq, ctx->state == SPU_STATE_RUNNABLE);
1643 if (ret)
1644 goto out;
1645
1646 if (file->f_flags & O_NONBLOCK) {
1647 ret = ctx->ops->send_mfc_command(ctx, &cmd);
1648 } else {
1649 int status;
1650 ret = spufs_wait(ctx->mfc_wq,
1651 spu_send_mfc_command(ctx, cmd, &status));
1652 if (ret)
1653 goto out;
1654 if (status)
1655 ret = status;
1656 }
1657
1658 if (ret)
1659 goto out_unlock;
1660
1661 ctx->tagwait |= 1 << cmd.tag;
1662 ret = size;
1663
1664 out_unlock:
1665 spu_release(ctx);
1666 out:
1667 return ret;
1668 }
1669
1670 static __poll_t spufs_mfc_poll(struct file *file,poll_table *wait)
1671 {
1672 struct spu_context *ctx = file->private_data;
1673 u32 free_elements, tagstatus;
1674 __poll_t mask;
1675
1676 poll_wait(file, &ctx->mfc_wq, wait);
1677
1678 /*
1679 * For now keep this uninterruptible and also ignore the rule
1680 * that poll should not sleep. Will be fixed later.
1681 */
1682 mutex_lock(&ctx->state_mutex);
1683 ctx->ops->set_mfc_query(ctx, ctx->tagwait, 2);
1684 free_elements = ctx->ops->get_mfc_free_elements(ctx);
1685 tagstatus = ctx->ops->read_mfc_tagstatus(ctx);
1686 spu_release(ctx);
1687
1688 mask = 0;
1689 if (free_elements & 0xffff)
1690 mask |= EPOLLOUT | EPOLLWRNORM;
1691 if (tagstatus & ctx->tagwait)
1692 mask |= EPOLLIN | EPOLLRDNORM;
1693
1694 pr_debug("%s: free %d tagstatus %d tagwait %d\n", __func__,
1695 free_elements, tagstatus, ctx->tagwait);
1696
1697 return mask;
1698 }
1699
1700 static int spufs_mfc_flush(struct file *file, fl_owner_t id)
1701 {
1702 struct spu_context *ctx = file->private_data;
1703 int ret;
1704
1705 ret = spu_acquire(ctx);
1706 if (ret)
1707 return ret;
1708
1709 spu_release(ctx);
1710
1711 return 0;
1712 }
1713
1714 static int spufs_mfc_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1715 {
1716 struct inode *inode = file_inode(file);
1717 int err = file_write_and_wait_range(file, start, end);
1718 if (!err) {
1719 inode_lock(inode);
1720 err = spufs_mfc_flush(file, NULL);
1721 inode_unlock(inode);
1722 }
1723 return err;
1724 }
1725
1726 static const struct file_operations spufs_mfc_fops = {
1727 .open = spufs_mfc_open,
1728 .release = spufs_mfc_release,
1729 .read = spufs_mfc_read,
1730 .write = spufs_mfc_write,
1731 .poll = spufs_mfc_poll,
1732 .flush = spufs_mfc_flush,
1733 .fsync = spufs_mfc_fsync,
1734 .mmap = spufs_mfc_mmap,
1735 .llseek = no_llseek,
1736 };
1737
1738 static int spufs_npc_set(void *data, u64 val)
1739 {
1740 struct spu_context *ctx = data;
1741 int ret;
1742
1743 ret = spu_acquire(ctx);
1744 if (ret)
1745 return ret;
1746 ctx->ops->npc_write(ctx, val);
1747 spu_release(ctx);
1748
1749 return 0;
1750 }
1751
1752 static u64 spufs_npc_get(struct spu_context *ctx)
1753 {
1754 return ctx->ops->npc_read(ctx);
1755 }
1756 DEFINE_SPUFS_ATTRIBUTE(spufs_npc_ops, spufs_npc_get, spufs_npc_set,
1757 "0x%llx\n", SPU_ATTR_ACQUIRE);
1758
1759 static int spufs_decr_set(void *data, u64 val)
1760 {
1761 struct spu_context *ctx = data;
1762 struct spu_lscsa *lscsa = ctx->csa.lscsa;
1763 int ret;
1764
1765 ret = spu_acquire_saved(ctx);
1766 if (ret)
1767 return ret;
1768 lscsa->decr.slot[0] = (u32) val;
1769 spu_release_saved(ctx);
1770
1771 return 0;
1772 }
1773
1774 static u64 spufs_decr_get(struct spu_context *ctx)
1775 {
1776 struct spu_lscsa *lscsa = ctx->csa.lscsa;
1777 return lscsa->decr.slot[0];
1778 }
1779 DEFINE_SPUFS_ATTRIBUTE(spufs_decr_ops, spufs_decr_get, spufs_decr_set,
1780 "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED);
1781
1782 static int spufs_decr_status_set(void *data, u64 val)
1783 {
1784 struct spu_context *ctx = data;
1785 int ret;
1786
1787 ret = spu_acquire_saved(ctx);
1788 if (ret)
1789 return ret;
1790 if (val)
1791 ctx->csa.priv2.mfc_control_RW |= MFC_CNTL_DECREMENTER_RUNNING;
1792 else
1793 ctx->csa.priv2.mfc_control_RW &= ~MFC_CNTL_DECREMENTER_RUNNING;
1794 spu_release_saved(ctx);
1795
1796 return 0;
1797 }
1798
1799 static u64 spufs_decr_status_get(struct spu_context *ctx)
1800 {
1801 if (ctx->csa.priv2.mfc_control_RW & MFC_CNTL_DECREMENTER_RUNNING)
1802 return SPU_DECR_STATUS_RUNNING;
1803 else
1804 return 0;
1805 }
1806 DEFINE_SPUFS_ATTRIBUTE(spufs_decr_status_ops, spufs_decr_status_get,
1807 spufs_decr_status_set, "0x%llx\n",
1808 SPU_ATTR_ACQUIRE_SAVED);
1809
1810 static int spufs_event_mask_set(void *data, u64 val)
1811 {
1812 struct spu_context *ctx = data;
1813 struct spu_lscsa *lscsa = ctx->csa.lscsa;
1814 int ret;
1815
1816 ret = spu_acquire_saved(ctx);
1817 if (ret)
1818 return ret;
1819 lscsa->event_mask.slot[0] = (u32) val;
1820 spu_release_saved(ctx);
1821
1822 return 0;
1823 }
1824
1825 static u64 spufs_event_mask_get(struct spu_context *ctx)
1826 {
1827 struct spu_lscsa *lscsa = ctx->csa.lscsa;
1828 return lscsa->event_mask.slot[0];
1829 }
1830
1831 DEFINE_SPUFS_ATTRIBUTE(spufs_event_mask_ops, spufs_event_mask_get,
1832 spufs_event_mask_set, "0x%llx\n",
1833 SPU_ATTR_ACQUIRE_SAVED);
1834
1835 static u64 spufs_event_status_get(struct spu_context *ctx)
1836 {
1837 struct spu_state *state = &ctx->csa;
1838 u64 stat;
1839 stat = state->spu_chnlcnt_RW[0];
1840 if (stat)
1841 return state->spu_chnldata_RW[0];
1842 return 0;
1843 }
1844 DEFINE_SPUFS_ATTRIBUTE(spufs_event_status_ops, spufs_event_status_get,
1845 NULL, "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED)
1846
1847 static int spufs_srr0_set(void *data, u64 val)
1848 {
1849 struct spu_context *ctx = data;
1850 struct spu_lscsa *lscsa = ctx->csa.lscsa;
1851 int ret;
1852
1853 ret = spu_acquire_saved(ctx);
1854 if (ret)
1855 return ret;
1856 lscsa->srr0.slot[0] = (u32) val;
1857 spu_release_saved(ctx);
1858
1859 return 0;
1860 }
1861
1862 static u64 spufs_srr0_get(struct spu_context *ctx)
1863 {
1864 struct spu_lscsa *lscsa = ctx->csa.lscsa;
1865 return lscsa->srr0.slot[0];
1866 }
1867 DEFINE_SPUFS_ATTRIBUTE(spufs_srr0_ops, spufs_srr0_get, spufs_srr0_set,
1868 "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED)
1869
1870 static u64 spufs_id_get(struct spu_context *ctx)
1871 {
1872 u64 num;
1873
1874 if (ctx->state == SPU_STATE_RUNNABLE)
1875 num = ctx->spu->number;
1876 else
1877 num = (unsigned int)-1;
1878
1879 return num;
1880 }
1881 DEFINE_SPUFS_ATTRIBUTE(spufs_id_ops, spufs_id_get, NULL, "0x%llx\n",
1882 SPU_ATTR_ACQUIRE)
1883
1884 static u64 spufs_object_id_get(struct spu_context *ctx)
1885 {
1886 /* FIXME: Should there really be no locking here? */
1887 return ctx->object_id;
1888 }
1889
1890 static int spufs_object_id_set(void *data, u64 id)
1891 {
1892 struct spu_context *ctx = data;
1893 ctx->object_id = id;
1894
1895 return 0;
1896 }
1897
1898 DEFINE_SPUFS_ATTRIBUTE(spufs_object_id_ops, spufs_object_id_get,
1899 spufs_object_id_set, "0x%llx\n", SPU_ATTR_NOACQUIRE);
1900
1901 static u64 spufs_lslr_get(struct spu_context *ctx)
1902 {
1903 return ctx->csa.priv2.spu_lslr_RW;
1904 }
1905 DEFINE_SPUFS_ATTRIBUTE(spufs_lslr_ops, spufs_lslr_get, NULL, "0x%llx\n",
1906 SPU_ATTR_ACQUIRE_SAVED);
1907
1908 static int spufs_info_open(struct inode *inode, struct file *file)
1909 {
1910 struct spufs_inode_info *i = SPUFS_I(inode);
1911 struct spu_context *ctx = i->i_ctx;
1912 file->private_data = ctx;
1913 return 0;
1914 }
1915
1916 static int spufs_caps_show(struct seq_file *s, void *private)
1917 {
1918 struct spu_context *ctx = s->private;
1919
1920 if (!(ctx->flags & SPU_CREATE_NOSCHED))
1921 seq_puts(s, "sched\n");
1922 if (!(ctx->flags & SPU_CREATE_ISOLATE))
1923 seq_puts(s, "step\n");
1924 return 0;
1925 }
1926
1927 static int spufs_caps_open(struct inode *inode, struct file *file)
1928 {
1929 return single_open(file, spufs_caps_show, SPUFS_I(inode)->i_ctx);
1930 }
1931
1932 static const struct file_operations spufs_caps_fops = {
1933 .open = spufs_caps_open,
1934 .read = seq_read,
1935 .llseek = seq_lseek,
1936 .release = single_release,
1937 };
1938
1939 static ssize_t spufs_mbox_info_dump(struct spu_context *ctx,
1940 struct coredump_params *cprm)
1941 {
1942 if (!(ctx->csa.prob.mb_stat_R & 0x0000ff))
1943 return 0;
1944 return spufs_dump_emit(cprm, &ctx->csa.prob.pu_mb_R,
1945 sizeof(ctx->csa.prob.pu_mb_R));
1946 }
1947
1948 static ssize_t spufs_mbox_info_read(struct file *file, char __user *buf,
1949 size_t len, loff_t *pos)
1950 {
1951 struct spu_context *ctx = file->private_data;
1952 u32 stat, data;
1953 int ret;
1954
1955 ret = spu_acquire_saved(ctx);
1956 if (ret)
1957 return ret;
1958 spin_lock(&ctx->csa.register_lock);
1959 stat = ctx->csa.prob.mb_stat_R;
1960 data = ctx->csa.prob.pu_mb_R;
1961 spin_unlock(&ctx->csa.register_lock);
1962 spu_release_saved(ctx);
1963
1964 /* EOF if there's no entry in the mbox */
1965 if (!(stat & 0x0000ff))
1966 return 0;
1967
1968 return simple_read_from_buffer(buf, len, pos, &data, sizeof(data));
1969 }
1970
1971 static const struct file_operations spufs_mbox_info_fops = {
1972 .open = spufs_info_open,
1973 .read = spufs_mbox_info_read,
1974 .llseek = generic_file_llseek,
1975 };
1976
1977 static ssize_t spufs_ibox_info_dump(struct spu_context *ctx,
1978 struct coredump_params *cprm)
1979 {
1980 if (!(ctx->csa.prob.mb_stat_R & 0xff0000))
1981 return 0;
1982 return spufs_dump_emit(cprm, &ctx->csa.priv2.puint_mb_R,
1983 sizeof(ctx->csa.priv2.puint_mb_R));
1984 }
1985
1986 static ssize_t spufs_ibox_info_read(struct file *file, char __user *buf,
1987 size_t len, loff_t *pos)
1988 {
1989 struct spu_context *ctx = file->private_data;
1990 u32 stat, data;
1991 int ret;
1992
1993 ret = spu_acquire_saved(ctx);
1994 if (ret)
1995 return ret;
1996 spin_lock(&ctx->csa.register_lock);
1997 stat = ctx->csa.prob.mb_stat_R;
1998 data = ctx->csa.priv2.puint_mb_R;
1999 spin_unlock(&ctx->csa.register_lock);
2000 spu_release_saved(ctx);
2001
2002 /* EOF if there's no entry in the ibox */
2003 if (!(stat & 0xff0000))
2004 return 0;
2005
2006 return simple_read_from_buffer(buf, len, pos, &data, sizeof(data));
2007 }
2008
2009 static const struct file_operations spufs_ibox_info_fops = {
2010 .open = spufs_info_open,
2011 .read = spufs_ibox_info_read,
2012 .llseek = generic_file_llseek,
2013 };
2014
2015 static size_t spufs_wbox_info_cnt(struct spu_context *ctx)
2016 {
2017 return (4 - ((ctx->csa.prob.mb_stat_R & 0x00ff00) >> 8)) * sizeof(u32);
2018 }
2019
2020 static ssize_t spufs_wbox_info_dump(struct spu_context *ctx,
2021 struct coredump_params *cprm)
2022 {
2023 return spufs_dump_emit(cprm, &ctx->csa.spu_mailbox_data,
2024 spufs_wbox_info_cnt(ctx));
2025 }
2026
2027 static ssize_t spufs_wbox_info_read(struct file *file, char __user *buf,
2028 size_t len, loff_t *pos)
2029 {
2030 struct spu_context *ctx = file->private_data;
2031 u32 data[ARRAY_SIZE(ctx->csa.spu_mailbox_data)];
2032 int ret, count;
2033
2034 ret = spu_acquire_saved(ctx);
2035 if (ret)
2036 return ret;
2037 spin_lock(&ctx->csa.register_lock);
2038 count = spufs_wbox_info_cnt(ctx);
2039 memcpy(&data, &ctx->csa.spu_mailbox_data, sizeof(data));
2040 spin_unlock(&ctx->csa.register_lock);
2041 spu_release_saved(ctx);
2042
2043 return simple_read_from_buffer(buf, len, pos, &data,
2044 count * sizeof(u32));
2045 }
2046
2047 static const struct file_operations spufs_wbox_info_fops = {
2048 .open = spufs_info_open,
2049 .read = spufs_wbox_info_read,
2050 .llseek = generic_file_llseek,
2051 };
2052
2053 static void spufs_get_dma_info(struct spu_context *ctx,
2054 struct spu_dma_info *info)
2055 {
2056 int i;
2057
2058 info->dma_info_type = ctx->csa.priv2.spu_tag_status_query_RW;
2059 info->dma_info_mask = ctx->csa.lscsa->tag_mask.slot[0];
2060 info->dma_info_status = ctx->csa.spu_chnldata_RW[24];
2061 info->dma_info_stall_and_notify = ctx->csa.spu_chnldata_RW[25];
2062 info->dma_info_atomic_command_status = ctx->csa.spu_chnldata_RW[27];
2063 for (i = 0; i < 16; i++) {
2064 struct mfc_cq_sr *qp = &info->dma_info_command_data[i];
2065 struct mfc_cq_sr *spuqp = &ctx->csa.priv2.spuq[i];
2066
2067 qp->mfc_cq_data0_RW = spuqp->mfc_cq_data0_RW;
2068 qp->mfc_cq_data1_RW = spuqp->mfc_cq_data1_RW;
2069 qp->mfc_cq_data2_RW = spuqp->mfc_cq_data2_RW;
2070 qp->mfc_cq_data3_RW = spuqp->mfc_cq_data3_RW;
2071 }
2072 }
2073
2074 static ssize_t spufs_dma_info_dump(struct spu_context *ctx,
2075 struct coredump_params *cprm)
2076 {
2077 struct spu_dma_info info;
2078
2079 spufs_get_dma_info(ctx, &info);
2080 return spufs_dump_emit(cprm, &info, sizeof(info));
2081 }
2082
2083 static ssize_t spufs_dma_info_read(struct file *file, char __user *buf,
2084 size_t len, loff_t *pos)
2085 {
2086 struct spu_context *ctx = file->private_data;
2087 struct spu_dma_info info;
2088 int ret;
2089
2090 ret = spu_acquire_saved(ctx);
2091 if (ret)
2092 return ret;
2093 spin_lock(&ctx->csa.register_lock);
2094 spufs_get_dma_info(ctx, &info);
2095 spin_unlock(&ctx->csa.register_lock);
2096 spu_release_saved(ctx);
2097
2098 return simple_read_from_buffer(buf, len, pos, &info,
2099 sizeof(info));
2100 }
2101
2102 static const struct file_operations spufs_dma_info_fops = {
2103 .open = spufs_info_open,
2104 .read = spufs_dma_info_read,
2105 .llseek = no_llseek,
2106 };
2107
2108 static void spufs_get_proxydma_info(struct spu_context *ctx,
2109 struct spu_proxydma_info *info)
2110 {
2111 int i;
2112
2113 info->proxydma_info_type = ctx->csa.prob.dma_querytype_RW;
2114 info->proxydma_info_mask = ctx->csa.prob.dma_querymask_RW;
2115 info->proxydma_info_status = ctx->csa.prob.dma_tagstatus_R;
2116
2117 for (i = 0; i < 8; i++) {
2118 struct mfc_cq_sr *qp = &info->proxydma_info_command_data[i];
2119 struct mfc_cq_sr *puqp = &ctx->csa.priv2.puq[i];
2120
2121 qp->mfc_cq_data0_RW = puqp->mfc_cq_data0_RW;
2122 qp->mfc_cq_data1_RW = puqp->mfc_cq_data1_RW;
2123 qp->mfc_cq_data2_RW = puqp->mfc_cq_data2_RW;
2124 qp->mfc_cq_data3_RW = puqp->mfc_cq_data3_RW;
2125 }
2126 }
2127
2128 static ssize_t spufs_proxydma_info_dump(struct spu_context *ctx,
2129 struct coredump_params *cprm)
2130 {
2131 struct spu_proxydma_info info;
2132
2133 spufs_get_proxydma_info(ctx, &info);
2134 return spufs_dump_emit(cprm, &info, sizeof(info));
2135 }
2136
2137 static ssize_t spufs_proxydma_info_read(struct file *file, char __user *buf,
2138 size_t len, loff_t *pos)
2139 {
2140 struct spu_context *ctx = file->private_data;
2141 struct spu_proxydma_info info;
2142 int ret;
2143
2144 if (len < sizeof(info))
2145 return -EINVAL;
2146
2147 ret = spu_acquire_saved(ctx);
2148 if (ret)
2149 return ret;
2150 spin_lock(&ctx->csa.register_lock);
2151 spufs_get_proxydma_info(ctx, &info);
2152 spin_unlock(&ctx->csa.register_lock);
2153 spu_release_saved(ctx);
2154
2155 return simple_read_from_buffer(buf, len, pos, &info,
2156 sizeof(info));
2157 }
2158
2159 static const struct file_operations spufs_proxydma_info_fops = {
2160 .open = spufs_info_open,
2161 .read = spufs_proxydma_info_read,
2162 .llseek = no_llseek,
2163 };
2164
2165 static int spufs_show_tid(struct seq_file *s, void *private)
2166 {
2167 struct spu_context *ctx = s->private;
2168
2169 seq_printf(s, "%d\n", ctx->tid);
2170 return 0;
2171 }
2172
2173 static int spufs_tid_open(struct inode *inode, struct file *file)
2174 {
2175 return single_open(file, spufs_show_tid, SPUFS_I(inode)->i_ctx);
2176 }
2177
2178 static const struct file_operations spufs_tid_fops = {
2179 .open = spufs_tid_open,
2180 .read = seq_read,
2181 .llseek = seq_lseek,
2182 .release = single_release,
2183 };
2184
2185 static const char *ctx_state_names[] = {
2186 "user", "system", "iowait", "loaded"
2187 };
2188
2189 static unsigned long long spufs_acct_time(struct spu_context *ctx,
2190 enum spu_utilization_state state)
2191 {
2192 unsigned long long time = ctx->stats.times[state];
2193
2194 /*
2195 * In general, utilization statistics are updated by the controlling
2196 * thread as the spu context moves through various well defined
2197 * state transitions, but if the context is lazily loaded its
2198 * utilization statistics are not updated as the controlling thread
2199 * is not tightly coupled with the execution of the spu context. We
2200 * calculate and apply the time delta from the last recorded state
2201 * of the spu context.
2202 */
2203 if (ctx->spu && ctx->stats.util_state == state) {
2204 time += ktime_get_ns() - ctx->stats.tstamp;
2205 }
2206
2207 return time / NSEC_PER_MSEC;
2208 }
2209
2210 static unsigned long long spufs_slb_flts(struct spu_context *ctx)
2211 {
2212 unsigned long long slb_flts = ctx->stats.slb_flt;
2213
2214 if (ctx->state == SPU_STATE_RUNNABLE) {
2215 slb_flts += (ctx->spu->stats.slb_flt -
2216 ctx->stats.slb_flt_base);
2217 }
2218
2219 return slb_flts;
2220 }
2221
2222 static unsigned long long spufs_class2_intrs(struct spu_context *ctx)
2223 {
2224 unsigned long long class2_intrs = ctx->stats.class2_intr;
2225
2226 if (ctx->state == SPU_STATE_RUNNABLE) {
2227 class2_intrs += (ctx->spu->stats.class2_intr -
2228 ctx->stats.class2_intr_base);
2229 }
2230
2231 return class2_intrs;
2232 }
2233
2234
2235 static int spufs_show_stat(struct seq_file *s, void *private)
2236 {
2237 struct spu_context *ctx = s->private;
2238 int ret;
2239
2240 ret = spu_acquire(ctx);
2241 if (ret)
2242 return ret;
2243
2244 seq_printf(s, "%s %llu %llu %llu %llu "
2245 "%llu %llu %llu %llu %llu %llu %llu %llu\n",
2246 ctx_state_names[ctx->stats.util_state],
2247 spufs_acct_time(ctx, SPU_UTIL_USER),
2248 spufs_acct_time(ctx, SPU_UTIL_SYSTEM),
2249 spufs_acct_time(ctx, SPU_UTIL_IOWAIT),
2250 spufs_acct_time(ctx, SPU_UTIL_IDLE_LOADED),
2251 ctx->stats.vol_ctx_switch,
2252 ctx->stats.invol_ctx_switch,
2253 spufs_slb_flts(ctx),
2254 ctx->stats.hash_flt,
2255 ctx->stats.min_flt,
2256 ctx->stats.maj_flt,
2257 spufs_class2_intrs(ctx),
2258 ctx->stats.libassist);
2259 spu_release(ctx);
2260 return 0;
2261 }
2262
2263 static int spufs_stat_open(struct inode *inode, struct file *file)
2264 {
2265 return single_open(file, spufs_show_stat, SPUFS_I(inode)->i_ctx);
2266 }
2267
2268 static const struct file_operations spufs_stat_fops = {
2269 .open = spufs_stat_open,
2270 .read = seq_read,
2271 .llseek = seq_lseek,
2272 .release = single_release,
2273 };
2274
2275 static inline int spufs_switch_log_used(struct spu_context *ctx)
2276 {
2277 return (ctx->switch_log->head - ctx->switch_log->tail) %
2278 SWITCH_LOG_BUFSIZE;
2279 }
2280
2281 static inline int spufs_switch_log_avail(struct spu_context *ctx)
2282 {
2283 return SWITCH_LOG_BUFSIZE - spufs_switch_log_used(ctx);
2284 }
2285
2286 static int spufs_switch_log_open(struct inode *inode, struct file *file)
2287 {
2288 struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2289 int rc;
2290
2291 rc = spu_acquire(ctx);
2292 if (rc)
2293 return rc;
2294
2295 if (ctx->switch_log) {
2296 rc = -EBUSY;
2297 goto out;
2298 }
2299
2300 ctx->switch_log = kmalloc(struct_size(ctx->switch_log, log,
2301 SWITCH_LOG_BUFSIZE), GFP_KERNEL);
2302
2303 if (!ctx->switch_log) {
2304 rc = -ENOMEM;
2305 goto out;
2306 }
2307
2308 ctx->switch_log->head = ctx->switch_log->tail = 0;
2309 init_waitqueue_head(&ctx->switch_log->wait);
2310 rc = 0;
2311
2312 out:
2313 spu_release(ctx);
2314 return rc;
2315 }
2316
2317 static int spufs_switch_log_release(struct inode *inode, struct file *file)
2318 {
2319 struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2320 int rc;
2321
2322 rc = spu_acquire(ctx);
2323 if (rc)
2324 return rc;
2325
2326 kfree(ctx->switch_log);
2327 ctx->switch_log = NULL;
2328 spu_release(ctx);
2329
2330 return 0;
2331 }
2332
2333 static int switch_log_sprint(struct spu_context *ctx, char *tbuf, int n)
2334 {
2335 struct switch_log_entry *p;
2336
2337 p = ctx->switch_log->log + ctx->switch_log->tail % SWITCH_LOG_BUFSIZE;
2338
2339 return snprintf(tbuf, n, "%llu.%09u %d %u %u %llu\n",
2340 (unsigned long long) p->tstamp.tv_sec,
2341 (unsigned int) p->tstamp.tv_nsec,
2342 p->spu_id,
2343 (unsigned int) p->type,
2344 (unsigned int) p->val,
2345 (unsigned long long) p->timebase);
2346 }
2347
2348 static ssize_t spufs_switch_log_read(struct file *file, char __user *buf,
2349 size_t len, loff_t *ppos)
2350 {
2351 struct inode *inode = file_inode(file);
2352 struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2353 int error = 0, cnt = 0;
2354
2355 if (!buf)
2356 return -EINVAL;
2357
2358 error = spu_acquire(ctx);
2359 if (error)
2360 return error;
2361
2362 while (cnt < len) {
2363 char tbuf[128];
2364 int width;
2365
2366 if (spufs_switch_log_used(ctx) == 0) {
2367 if (cnt > 0) {
2368 /* If there's data ready to go, we can
2369 * just return straight away */
2370 break;
2371
2372 } else if (file->f_flags & O_NONBLOCK) {
2373 error = -EAGAIN;
2374 break;
2375
2376 } else {
2377 /* spufs_wait will drop the mutex and
2378 * re-acquire, but since we're in read(), the
2379 * file cannot be _released (and so
2380 * ctx->switch_log is stable).
2381 */
2382 error = spufs_wait(ctx->switch_log->wait,
2383 spufs_switch_log_used(ctx) > 0);
2384
2385 /* On error, spufs_wait returns without the
2386 * state mutex held */
2387 if (error)
2388 return error;
2389
2390 /* We may have had entries read from underneath
2391 * us while we dropped the mutex in spufs_wait,
2392 * so re-check */
2393 if (spufs_switch_log_used(ctx) == 0)
2394 continue;
2395 }
2396 }
2397
2398 width = switch_log_sprint(ctx, tbuf, sizeof(tbuf));
2399 if (width < len)
2400 ctx->switch_log->tail =
2401 (ctx->switch_log->tail + 1) %
2402 SWITCH_LOG_BUFSIZE;
2403 else
2404 /* If the record is greater than space available return
2405 * partial buffer (so far) */
2406 break;
2407
2408 error = copy_to_user(buf + cnt, tbuf, width);
2409 if (error)
2410 break;
2411 cnt += width;
2412 }
2413
2414 spu_release(ctx);
2415
2416 return cnt == 0 ? error : cnt;
2417 }
2418
2419 static __poll_t spufs_switch_log_poll(struct file *file, poll_table *wait)
2420 {
2421 struct inode *inode = file_inode(file);
2422 struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2423 __poll_t mask = 0;
2424 int rc;
2425
2426 poll_wait(file, &ctx->switch_log->wait, wait);
2427
2428 rc = spu_acquire(ctx);
2429 if (rc)
2430 return rc;
2431
2432 if (spufs_switch_log_used(ctx) > 0)
2433 mask |= EPOLLIN;
2434
2435 spu_release(ctx);
2436
2437 return mask;
2438 }
2439
2440 static const struct file_operations spufs_switch_log_fops = {
2441 .open = spufs_switch_log_open,
2442 .read = spufs_switch_log_read,
2443 .poll = spufs_switch_log_poll,
2444 .release = spufs_switch_log_release,
2445 .llseek = no_llseek,
2446 };
2447
2448 /**
2449 * Log a context switch event to a switch log reader.
2450 *
2451 * Must be called with ctx->state_mutex held.
2452 */
2453 void spu_switch_log_notify(struct spu *spu, struct spu_context *ctx,
2454 u32 type, u32 val)
2455 {
2456 if (!ctx->switch_log)
2457 return;
2458
2459 if (spufs_switch_log_avail(ctx) > 1) {
2460 struct switch_log_entry *p;
2461
2462 p = ctx->switch_log->log + ctx->switch_log->head;
2463 ktime_get_ts64(&p->tstamp);
2464 p->timebase = get_tb();
2465 p->spu_id = spu ? spu->number : -1;
2466 p->type = type;
2467 p->val = val;
2468
2469 ctx->switch_log->head =
2470 (ctx->switch_log->head + 1) % SWITCH_LOG_BUFSIZE;
2471 }
2472
2473 wake_up(&ctx->switch_log->wait);
2474 }
2475
2476 static int spufs_show_ctx(struct seq_file *s, void *private)
2477 {
2478 struct spu_context *ctx = s->private;
2479 u64 mfc_control_RW;
2480
2481 mutex_lock(&ctx->state_mutex);
2482 if (ctx->spu) {
2483 struct spu *spu = ctx->spu;
2484 struct spu_priv2 __iomem *priv2 = spu->priv2;
2485
2486 spin_lock_irq(&spu->register_lock);
2487 mfc_control_RW = in_be64(&priv2->mfc_control_RW);
2488 spin_unlock_irq(&spu->register_lock);
2489 } else {
2490 struct spu_state *csa = &ctx->csa;
2491
2492 mfc_control_RW = csa->priv2.mfc_control_RW;
2493 }
2494
2495 seq_printf(s, "%c flgs(%lx) sflgs(%lx) pri(%d) ts(%d) spu(%02d)"
2496 " %c %llx %llx %llx %llx %x %x\n",
2497 ctx->state == SPU_STATE_SAVED ? 'S' : 'R',
2498 ctx->flags,
2499 ctx->sched_flags,
2500 ctx->prio,
2501 ctx->time_slice,
2502 ctx->spu ? ctx->spu->number : -1,
2503 !list_empty(&ctx->rq) ? 'q' : ' ',
2504 ctx->csa.class_0_pending,
2505 ctx->csa.class_0_dar,
2506 ctx->csa.class_1_dsisr,
2507 mfc_control_RW,
2508 ctx->ops->runcntl_read(ctx),
2509 ctx->ops->status_read(ctx));
2510
2511 mutex_unlock(&ctx->state_mutex);
2512
2513 return 0;
2514 }
2515
2516 static int spufs_ctx_open(struct inode *inode, struct file *file)
2517 {
2518 return single_open(file, spufs_show_ctx, SPUFS_I(inode)->i_ctx);
2519 }
2520
2521 static const struct file_operations spufs_ctx_fops = {
2522 .open = spufs_ctx_open,
2523 .read = seq_read,
2524 .llseek = seq_lseek,
2525 .release = single_release,
2526 };
2527
2528 const struct spufs_tree_descr spufs_dir_contents[] = {
2529 { "capabilities", &spufs_caps_fops, 0444, },
2530 { "mem", &spufs_mem_fops, 0666, LS_SIZE, },
2531 { "regs", &spufs_regs_fops, 0666, sizeof(struct spu_reg128[128]), },
2532 { "mbox", &spufs_mbox_fops, 0444, },
2533 { "ibox", &spufs_ibox_fops, 0444, },
2534 { "wbox", &spufs_wbox_fops, 0222, },
2535 { "mbox_stat", &spufs_mbox_stat_fops, 0444, sizeof(u32), },
2536 { "ibox_stat", &spufs_ibox_stat_fops, 0444, sizeof(u32), },
2537 { "wbox_stat", &spufs_wbox_stat_fops, 0444, sizeof(u32), },
2538 { "signal1", &spufs_signal1_fops, 0666, },
2539 { "signal2", &spufs_signal2_fops, 0666, },
2540 { "signal1_type", &spufs_signal1_type, 0666, },
2541 { "signal2_type", &spufs_signal2_type, 0666, },
2542 { "cntl", &spufs_cntl_fops, 0666, },
2543 { "fpcr", &spufs_fpcr_fops, 0666, sizeof(struct spu_reg128), },
2544 { "lslr", &spufs_lslr_ops, 0444, },
2545 { "mfc", &spufs_mfc_fops, 0666, },
2546 { "mss", &spufs_mss_fops, 0666, },
2547 { "npc", &spufs_npc_ops, 0666, },
2548 { "srr0", &spufs_srr0_ops, 0666, },
2549 { "decr", &spufs_decr_ops, 0666, },
2550 { "decr_status", &spufs_decr_status_ops, 0666, },
2551 { "event_mask", &spufs_event_mask_ops, 0666, },
2552 { "event_status", &spufs_event_status_ops, 0444, },
2553 { "psmap", &spufs_psmap_fops, 0666, SPUFS_PS_MAP_SIZE, },
2554 { "phys-id", &spufs_id_ops, 0666, },
2555 { "object-id", &spufs_object_id_ops, 0666, },
2556 { "mbox_info", &spufs_mbox_info_fops, 0444, sizeof(u32), },
2557 { "ibox_info", &spufs_ibox_info_fops, 0444, sizeof(u32), },
2558 { "wbox_info", &spufs_wbox_info_fops, 0444, sizeof(u32), },
2559 { "dma_info", &spufs_dma_info_fops, 0444,
2560 sizeof(struct spu_dma_info), },
2561 { "proxydma_info", &spufs_proxydma_info_fops, 0444,
2562 sizeof(struct spu_proxydma_info)},
2563 { "tid", &spufs_tid_fops, 0444, },
2564 { "stat", &spufs_stat_fops, 0444, },
2565 { "switch_log", &spufs_switch_log_fops, 0444 },
2566 {},
2567 };
2568
2569 const struct spufs_tree_descr spufs_dir_nosched_contents[] = {
2570 { "capabilities", &spufs_caps_fops, 0444, },
2571 { "mem", &spufs_mem_fops, 0666, LS_SIZE, },
2572 { "mbox", &spufs_mbox_fops, 0444, },
2573 { "ibox", &spufs_ibox_fops, 0444, },
2574 { "wbox", &spufs_wbox_fops, 0222, },
2575 { "mbox_stat", &spufs_mbox_stat_fops, 0444, sizeof(u32), },
2576 { "ibox_stat", &spufs_ibox_stat_fops, 0444, sizeof(u32), },
2577 { "wbox_stat", &spufs_wbox_stat_fops, 0444, sizeof(u32), },
2578 { "signal1", &spufs_signal1_nosched_fops, 0222, },
2579 { "signal2", &spufs_signal2_nosched_fops, 0222, },
2580 { "signal1_type", &spufs_signal1_type, 0666, },
2581 { "signal2_type", &spufs_signal2_type, 0666, },
2582 { "mss", &spufs_mss_fops, 0666, },
2583 { "mfc", &spufs_mfc_fops, 0666, },
2584 { "cntl", &spufs_cntl_fops, 0666, },
2585 { "npc", &spufs_npc_ops, 0666, },
2586 { "psmap", &spufs_psmap_fops, 0666, SPUFS_PS_MAP_SIZE, },
2587 { "phys-id", &spufs_id_ops, 0666, },
2588 { "object-id", &spufs_object_id_ops, 0666, },
2589 { "tid", &spufs_tid_fops, 0444, },
2590 { "stat", &spufs_stat_fops, 0444, },
2591 {},
2592 };
2593
2594 const struct spufs_tree_descr spufs_dir_debug_contents[] = {
2595 { ".ctx", &spufs_ctx_fops, 0444, },
2596 {},
2597 };
2598
2599 const struct spufs_coredump_reader spufs_coredump_read[] = {
2600 { "regs", spufs_regs_dump, NULL, sizeof(struct spu_reg128[128])},
2601 { "fpcr", spufs_fpcr_dump, NULL, sizeof(struct spu_reg128) },
2602 { "lslr", NULL, spufs_lslr_get, 19 },
2603 { "decr", NULL, spufs_decr_get, 19 },
2604 { "decr_status", NULL, spufs_decr_status_get, 19 },
2605 { "mem", spufs_mem_dump, NULL, LS_SIZE, },
2606 { "signal1", spufs_signal1_dump, NULL, sizeof(u32) },
2607 { "signal1_type", NULL, spufs_signal1_type_get, 19 },
2608 { "signal2", spufs_signal2_dump, NULL, sizeof(u32) },
2609 { "signal2_type", NULL, spufs_signal2_type_get, 19 },
2610 { "event_mask", NULL, spufs_event_mask_get, 19 },
2611 { "event_status", NULL, spufs_event_status_get, 19 },
2612 { "mbox_info", spufs_mbox_info_dump, NULL, sizeof(u32) },
2613 { "ibox_info", spufs_ibox_info_dump, NULL, sizeof(u32) },
2614 { "wbox_info", spufs_wbox_info_dump, NULL, 4 * sizeof(u32)},
2615 { "dma_info", spufs_dma_info_dump, NULL, sizeof(struct spu_dma_info)},
2616 { "proxydma_info", spufs_proxydma_info_dump,
2617 NULL, sizeof(struct spu_proxydma_info)},
2618 { "object-id", NULL, spufs_object_id_get, 19 },
2619 { "npc", NULL, spufs_npc_get, 19 },
2620 { NULL },
2621 };
2622
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