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(size: 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, filp: file);
62	}
63
64	static int spufs_attr_release(struct inode *inode, struct file *file)
65	{
66	kfree(objp: 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(buf: attr->get_buf, size: sizeof(attr->get_buf),
94	fmt: attr->fmt, (unsigned long long)val);
95	}
96
97	ret = simple_read_from_buffer(to: buf, count: len, ppos, from: attr->get_buf, available: size);
98	out:
99	mutex_unlock(lock: &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(to: attr->set_buf, from: buf, n: 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(lock: &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, addr: buf, nr: 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(lock: &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(lock: &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, buf: ctx->ops->get_ls(ctx), size: 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(to: buffer, count: size, ppos: pos, from: ctx->ops->get_ls(ctx),
200	available: 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(to: local_store, available: LS_SIZE, ppos, from: buffer, count: 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(addr: 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, addr: 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(vma: vmf->vma, addr: vmf->address,
354	pfn: (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, ps_offs: 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(lock: &ctx->mapping_lock);
432	return simple_attr_open(inode, file, get: spufs_cntl_get,
433	set: spufs_cntl_set, fmt: "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(lock: &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, buf: ctx->csa.lscsa->gprs,
472	size: 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(to: buffer, count: size, ppos: pos, from: ctx->csa.lscsa->gprs,
491	available: 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(to: lscsa->gprs, available: sizeof(lscsa->gprs), ppos: pos,
512	from: buffer, count: 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, buf: &ctx->csa.lscsa->fpcr,
529	size: 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(to: buffer, count: size, ppos: pos, from: &ctx->csa.lscsa->fpcr,
543	available: 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(to: &lscsa->fpcr, available: sizeof(lscsa->fpcr), ppos: pos,
564	from: buffer, count: 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, filp: 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(to: buf, from: &mbox_stat, n: 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, data: &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(filp: file, wait_address: &ctx->ibox_wq, p: 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(to: buf, from: &ibox_stat, n: 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, data: 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, data: 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(filp: file, wait_address: &ctx->wbox_wq, p: 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(to: buf, from: &wbox_stat, n: 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(lock: &ctx->mapping_lock);
945	return nonseekable_open(inode, filp: 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(lock: &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, buf: &ctx->csa.spu_chnldata_RW[3],
967	size: 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(to: buf, from: &ctx->csa.spu_chnldata_RW[3],
978	n: 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(to: &data, from: buf, n: 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, ps_offs: 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(lock: &ctx->mapping_lock);
1080	return nonseekable_open(inode, filp: 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(lock: &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, buf: &ctx->csa.spu_chnldata_RW[4],
1102	size: 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(to: buf, from: &ctx->csa.spu_chnldata_RW[4],
1113	n: 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(to: &data, from: buf, n: 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, ps_offs: 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, ps_offs: 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(lock: &ctx->mapping_lock);
1326	return nonseekable_open(inode, filp: 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(lock: &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, ps_offs: 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(lock: &ctx->mapping_lock);
1384	return nonseekable_open(inode, filp: 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(lock: &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, ps_offs: 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(v: &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(lock: &ctx->mapping_lock);
1454	return nonseekable_open(inode, filp: 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(lock: &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(to: buffer, from: &status, n: 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(to: &cmd, from: buffer, n: sizeof cmd))
1632	goto out;
1633
1634	ret = spufs_check_valid_dma(cmd: &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(filp: file, wait_address: &ctx->mfc_wq, p: 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	goto out;
1708	#if 0
1709	/* this currently hangs */
1710	ret = spufs_wait(ctx->mfc_wq,
1711	ctx->ops->set_mfc_query(ctx, ctx->tagwait, 2));
1712	if (ret)
1713	goto out;
1714	ret = spufs_wait(ctx->mfc_wq,
1715	ctx->ops->read_mfc_tagstatus(ctx) == ctx->tagwait);
1716	if (ret)
1717	goto out;
1718	#else
1719	ret = 0;
1720	#endif
1721	spu_release(ctx);
1722	out:
1723	return ret;
1724	}
1725
1726	static int spufs_mfc_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1727	{
1728	struct inode *inode = file_inode(f: file);
1729	int err = file_write_and_wait_range(file, start, end);
1730	if (!err) {
1731	inode_lock(inode);
1732	err = spufs_mfc_flush(file, NULL);
1733	inode_unlock(inode);
1734	}
1735	return err;
1736	}
1737
1738	static const struct file_operations spufs_mfc_fops = {
1739	.open = spufs_mfc_open,
1740	.release = spufs_mfc_release,
1741	.read = spufs_mfc_read,
1742	.write = spufs_mfc_write,
1743	.poll = spufs_mfc_poll,
1744	.flush = spufs_mfc_flush,
1745	.fsync = spufs_mfc_fsync,
1746	.mmap = spufs_mfc_mmap,
1747	.llseek = no_llseek,
1748	};
1749
1750	static int spufs_npc_set(void *data, u64 val)
1751	{
1752	struct spu_context *ctx = data;
1753	int ret;
1754
1755	ret = spu_acquire(ctx);
1756	if (ret)
1757	return ret;
1758	ctx->ops->npc_write(ctx, val);
1759	spu_release(ctx);
1760
1761	return 0;
1762	}
1763
1764	static u64 spufs_npc_get(struct spu_context *ctx)
1765	{
1766	return ctx->ops->npc_read(ctx);
1767	}
1768	DEFINE_SPUFS_ATTRIBUTE(spufs_npc_ops, spufs_npc_get, spufs_npc_set,
1769	"0x%llx\n", SPU_ATTR_ACQUIRE);
1770
1771	static int spufs_decr_set(void *data, u64 val)
1772	{
1773	struct spu_context *ctx = data;
1774	struct spu_lscsa *lscsa = ctx->csa.lscsa;
1775	int ret;
1776
1777	ret = spu_acquire_saved(ctx);
1778	if (ret)
1779	return ret;
1780	lscsa->decr.slot[0] = (u32) val;
1781	spu_release_saved(ctx);
1782
1783	return 0;
1784	}
1785
1786	static u64 spufs_decr_get(struct spu_context *ctx)
1787	{
1788	struct spu_lscsa *lscsa = ctx->csa.lscsa;
1789	return lscsa->decr.slot[0];
1790	}
1791	DEFINE_SPUFS_ATTRIBUTE(spufs_decr_ops, spufs_decr_get, spufs_decr_set,
1792	"0x%llx\n", SPU_ATTR_ACQUIRE_SAVED);
1793
1794	static int spufs_decr_status_set(void *data, u64 val)
1795	{
1796	struct spu_context *ctx = data;
1797	int ret;
1798
1799	ret = spu_acquire_saved(ctx);
1800	if (ret)
1801	return ret;
1802	if (val)
1803	ctx->csa.priv2.mfc_control_RW |= MFC_CNTL_DECREMENTER_RUNNING;
1804	else
1805	ctx->csa.priv2.mfc_control_RW &= ~MFC_CNTL_DECREMENTER_RUNNING;
1806	spu_release_saved(ctx);
1807
1808	return 0;
1809	}
1810
1811	static u64 spufs_decr_status_get(struct spu_context *ctx)
1812	{
1813	if (ctx->csa.priv2.mfc_control_RW & MFC_CNTL_DECREMENTER_RUNNING)
1814	return SPU_DECR_STATUS_RUNNING;
1815	else
1816	return 0;
1817	}
1818	DEFINE_SPUFS_ATTRIBUTE(spufs_decr_status_ops, spufs_decr_status_get,
1819	spufs_decr_status_set, "0x%llx\n",
1820	SPU_ATTR_ACQUIRE_SAVED);
1821
1822	static int spufs_event_mask_set(void *data, u64 val)
1823	{
1824	struct spu_context *ctx = data;
1825	struct spu_lscsa *lscsa = ctx->csa.lscsa;
1826	int ret;
1827
1828	ret = spu_acquire_saved(ctx);
1829	if (ret)
1830	return ret;
1831	lscsa->event_mask.slot[0] = (u32) val;
1832	spu_release_saved(ctx);
1833
1834	return 0;
1835	}
1836
1837	static u64 spufs_event_mask_get(struct spu_context *ctx)
1838	{
1839	struct spu_lscsa *lscsa = ctx->csa.lscsa;
1840	return lscsa->event_mask.slot[0];
1841	}
1842
1843	DEFINE_SPUFS_ATTRIBUTE(spufs_event_mask_ops, spufs_event_mask_get,
1844	spufs_event_mask_set, "0x%llx\n",
1845	SPU_ATTR_ACQUIRE_SAVED);
1846
1847	static u64 spufs_event_status_get(struct spu_context *ctx)
1848	{
1849	struct spu_state *state = &ctx->csa;
1850	u64 stat;
1851	stat = state->spu_chnlcnt_RW[0];
1852	if (stat)
1853	return state->spu_chnldata_RW[0];
1854	return 0;
1855	}
1856	DEFINE_SPUFS_ATTRIBUTE(spufs_event_status_ops, spufs_event_status_get,
1857	NULL, "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED)
1858
1859	static int spufs_srr0_set(void *data, u64 val)
1860	{
1861	struct spu_context *ctx = data;
1862	struct spu_lscsa *lscsa = ctx->csa.lscsa;
1863	int ret;
1864
1865	ret = spu_acquire_saved(ctx);
1866	if (ret)
1867	return ret;
1868	lscsa->srr0.slot[0] = (u32) val;
1869	spu_release_saved(ctx);
1870
1871	return 0;
1872	}
1873
1874	static u64 spufs_srr0_get(struct spu_context *ctx)
1875	{
1876	struct spu_lscsa *lscsa = ctx->csa.lscsa;
1877	return lscsa->srr0.slot[0];
1878	}
1879	DEFINE_SPUFS_ATTRIBUTE(spufs_srr0_ops, spufs_srr0_get, spufs_srr0_set,
1880	"0x%llx\n", SPU_ATTR_ACQUIRE_SAVED)
1881
1882	static u64 spufs_id_get(struct spu_context *ctx)
1883	{
1884	u64 num;
1885
1886	if (ctx->state == SPU_STATE_RUNNABLE)
1887	num = ctx->spu->number;
1888	else
1889	num = (unsigned int)-1;
1890
1891	return num;
1892	}
1893	DEFINE_SPUFS_ATTRIBUTE(spufs_id_ops, spufs_id_get, NULL, "0x%llx\n",
1894	SPU_ATTR_ACQUIRE)
1895
1896	static u64 spufs_object_id_get(struct spu_context *ctx)
1897	{
1898	/* FIXME: Should there really be no locking here? */
1899	return ctx->object_id;
1900	}
1901
1902	static int spufs_object_id_set(void *data, u64 id)
1903	{
1904	struct spu_context *ctx = data;
1905	ctx->object_id = id;
1906
1907	return 0;
1908	}
1909
1910	DEFINE_SPUFS_ATTRIBUTE(spufs_object_id_ops, spufs_object_id_get,
1911	spufs_object_id_set, "0x%llx\n", SPU_ATTR_NOACQUIRE);
1912
1913	static u64 spufs_lslr_get(struct spu_context *ctx)
1914	{
1915	return ctx->csa.priv2.spu_lslr_RW;
1916	}
1917	DEFINE_SPUFS_ATTRIBUTE(spufs_lslr_ops, spufs_lslr_get, NULL, "0x%llx\n",
1918	SPU_ATTR_ACQUIRE_SAVED);
1919
1920	static int spufs_info_open(struct inode *inode, struct file *file)
1921	{
1922	struct spufs_inode_info *i = SPUFS_I(inode);
1923	struct spu_context *ctx = i->i_ctx;
1924	file->private_data = ctx;
1925	return 0;
1926	}
1927
1928	static int spufs_caps_show(struct seq_file *s, void *private)
1929	{
1930	struct spu_context *ctx = s->private;
1931
1932	if (!(ctx->flags & SPU_CREATE_NOSCHED))
1933	seq_puts(m: s, s: "sched\n");
1934	if (!(ctx->flags & SPU_CREATE_ISOLATE))
1935	seq_puts(m: s, s: "step\n");
1936	return 0;
1937	}
1938
1939	static int spufs_caps_open(struct inode *inode, struct file *file)
1940	{
1941	return single_open(file, spufs_caps_show, SPUFS_I(inode)->i_ctx);
1942	}
1943
1944	static const struct file_operations spufs_caps_fops = {
1945	.open = spufs_caps_open,
1946	.read = seq_read,
1947	.llseek = seq_lseek,
1948	.release = single_release,
1949	};
1950
1951	static ssize_t spufs_mbox_info_dump(struct spu_context *ctx,
1952	struct coredump_params *cprm)
1953	{
1954	if (!(ctx->csa.prob.mb_stat_R & 0x0000ff))
1955	return 0;
1956	return spufs_dump_emit(cprm, buf: &ctx->csa.prob.pu_mb_R,
1957	size: sizeof(ctx->csa.prob.pu_mb_R));
1958	}
1959
1960	static ssize_t spufs_mbox_info_read(struct file *file, char __user *buf,
1961	size_t len, loff_t *pos)
1962	{
1963	struct spu_context *ctx = file->private_data;
1964	u32 stat, data;
1965	int ret;
1966
1967	ret = spu_acquire_saved(ctx);
1968	if (ret)
1969	return ret;
1970	spin_lock(lock: &ctx->csa.register_lock);
1971	stat = ctx->csa.prob.mb_stat_R;
1972	data = ctx->csa.prob.pu_mb_R;
1973	spin_unlock(lock: &ctx->csa.register_lock);
1974	spu_release_saved(ctx);
1975
1976	/* EOF if there's no entry in the mbox */
1977	if (!(stat & 0x0000ff))
1978	return 0;
1979
1980	return simple_read_from_buffer(to: buf, count: len, ppos: pos, from: &data, available: sizeof(data));
1981	}
1982
1983	static const struct file_operations spufs_mbox_info_fops = {
1984	.open = spufs_info_open,
1985	.read = spufs_mbox_info_read,
1986	.llseek = generic_file_llseek,
1987	};
1988
1989	static ssize_t spufs_ibox_info_dump(struct spu_context *ctx,
1990	struct coredump_params *cprm)
1991	{
1992	if (!(ctx->csa.prob.mb_stat_R & 0xff0000))
1993	return 0;
1994	return spufs_dump_emit(cprm, buf: &ctx->csa.priv2.puint_mb_R,
1995	size: sizeof(ctx->csa.priv2.puint_mb_R));
1996	}
1997
1998	static ssize_t spufs_ibox_info_read(struct file *file, char __user *buf,
1999	size_t len, loff_t *pos)
2000	{
2001	struct spu_context *ctx = file->private_data;
2002	u32 stat, data;
2003	int ret;
2004
2005	ret = spu_acquire_saved(ctx);
2006	if (ret)
2007	return ret;
2008	spin_lock(lock: &ctx->csa.register_lock);
2009	stat = ctx->csa.prob.mb_stat_R;
2010	data = ctx->csa.priv2.puint_mb_R;
2011	spin_unlock(lock: &ctx->csa.register_lock);
2012	spu_release_saved(ctx);
2013
2014	/* EOF if there's no entry in the ibox */
2015	if (!(stat & 0xff0000))
2016	return 0;
2017
2018	return simple_read_from_buffer(to: buf, count: len, ppos: pos, from: &data, available: sizeof(data));
2019	}
2020
2021	static const struct file_operations spufs_ibox_info_fops = {
2022	.open = spufs_info_open,
2023	.read = spufs_ibox_info_read,
2024	.llseek = generic_file_llseek,
2025	};
2026
2027	static size_t spufs_wbox_info_cnt(struct spu_context *ctx)
2028	{
2029	return (4 - ((ctx->csa.prob.mb_stat_R & 0x00ff00) >> 8)) * sizeof(u32);
2030	}
2031
2032	static ssize_t spufs_wbox_info_dump(struct spu_context *ctx,
2033	struct coredump_params *cprm)
2034	{
2035	return spufs_dump_emit(cprm, buf: &ctx->csa.spu_mailbox_data,
2036	size: spufs_wbox_info_cnt(ctx));
2037	}
2038
2039	static ssize_t spufs_wbox_info_read(struct file *file, char __user *buf,
2040	size_t len, loff_t *pos)
2041	{
2042	struct spu_context *ctx = file->private_data;
2043	u32 data[ARRAY_SIZE(ctx->csa.spu_mailbox_data)];
2044	int ret, count;
2045
2046	ret = spu_acquire_saved(ctx);
2047	if (ret)
2048	return ret;
2049	spin_lock(lock: &ctx->csa.register_lock);
2050	count = spufs_wbox_info_cnt(ctx);
2051	memcpy(to: &data, from: &ctx->csa.spu_mailbox_data, len: sizeof(data));
2052	spin_unlock(lock: &ctx->csa.register_lock);
2053	spu_release_saved(ctx);
2054
2055	return simple_read_from_buffer(to: buf, count: len, ppos: pos, from: &data,
2056	available: count * sizeof(u32));
2057	}
2058
2059	static const struct file_operations spufs_wbox_info_fops = {
2060	.open = spufs_info_open,
2061	.read = spufs_wbox_info_read,
2062	.llseek = generic_file_llseek,
2063	};
2064
2065	static void spufs_get_dma_info(struct spu_context *ctx,
2066	struct spu_dma_info *info)
2067	{
2068	int i;
2069
2070	info->dma_info_type = ctx->csa.priv2.spu_tag_status_query_RW;
2071	info->dma_info_mask = ctx->csa.lscsa->tag_mask.slot[0];
2072	info->dma_info_status = ctx->csa.spu_chnldata_RW[24];
2073	info->dma_info_stall_and_notify = ctx->csa.spu_chnldata_RW[25];
2074	info->dma_info_atomic_command_status = ctx->csa.spu_chnldata_RW[27];
2075	for (i = 0; i < 16; i++) {
2076	struct mfc_cq_sr *qp = &info->dma_info_command_data[i];
2077	struct mfc_cq_sr *spuqp = &ctx->csa.priv2.spuq[i];
2078
2079	qp->mfc_cq_data0_RW = spuqp->mfc_cq_data0_RW;
2080	qp->mfc_cq_data1_RW = spuqp->mfc_cq_data1_RW;
2081	qp->mfc_cq_data2_RW = spuqp->mfc_cq_data2_RW;
2082	qp->mfc_cq_data3_RW = spuqp->mfc_cq_data3_RW;
2083	}
2084	}
2085
2086	static ssize_t spufs_dma_info_dump(struct spu_context *ctx,
2087	struct coredump_params *cprm)
2088	{
2089	struct spu_dma_info info;
2090
2091	spufs_get_dma_info(ctx, info: &info);
2092	return spufs_dump_emit(cprm, buf: &info, size: sizeof(info));
2093	}
2094
2095	static ssize_t spufs_dma_info_read(struct file *file, char __user *buf,
2096	size_t len, loff_t *pos)
2097	{
2098	struct spu_context *ctx = file->private_data;
2099	struct spu_dma_info info;
2100	int ret;
2101
2102	ret = spu_acquire_saved(ctx);
2103	if (ret)
2104	return ret;
2105	spin_lock(lock: &ctx->csa.register_lock);
2106	spufs_get_dma_info(ctx, info: &info);
2107	spin_unlock(lock: &ctx->csa.register_lock);
2108	spu_release_saved(ctx);
2109
2110	return simple_read_from_buffer(to: buf, count: len, ppos: pos, from: &info,
2111	available: sizeof(info));
2112	}
2113
2114	static const struct file_operations spufs_dma_info_fops = {
2115	.open = spufs_info_open,
2116	.read = spufs_dma_info_read,
2117	.llseek = no_llseek,
2118	};
2119
2120	static void spufs_get_proxydma_info(struct spu_context *ctx,
2121	struct spu_proxydma_info *info)
2122	{
2123	int i;
2124
2125	info->proxydma_info_type = ctx->csa.prob.dma_querytype_RW;
2126	info->proxydma_info_mask = ctx->csa.prob.dma_querymask_RW;
2127	info->proxydma_info_status = ctx->csa.prob.dma_tagstatus_R;
2128
2129	for (i = 0; i < 8; i++) {
2130	struct mfc_cq_sr *qp = &info->proxydma_info_command_data[i];
2131	struct mfc_cq_sr *puqp = &ctx->csa.priv2.puq[i];
2132
2133	qp->mfc_cq_data0_RW = puqp->mfc_cq_data0_RW;
2134	qp->mfc_cq_data1_RW = puqp->mfc_cq_data1_RW;
2135	qp->mfc_cq_data2_RW = puqp->mfc_cq_data2_RW;
2136	qp->mfc_cq_data3_RW = puqp->mfc_cq_data3_RW;
2137	}
2138	}
2139
2140	static ssize_t spufs_proxydma_info_dump(struct spu_context *ctx,
2141	struct coredump_params *cprm)
2142	{
2143	struct spu_proxydma_info info;
2144
2145	spufs_get_proxydma_info(ctx, info: &info);
2146	return spufs_dump_emit(cprm, buf: &info, size: sizeof(info));
2147	}
2148
2149	static ssize_t spufs_proxydma_info_read(struct file *file, char __user *buf,
2150	size_t len, loff_t *pos)
2151	{
2152	struct spu_context *ctx = file->private_data;
2153	struct spu_proxydma_info info;
2154	int ret;
2155
2156	if (len < sizeof(info))
2157	return -EINVAL;
2158
2159	ret = spu_acquire_saved(ctx);
2160	if (ret)
2161	return ret;
2162	spin_lock(lock: &ctx->csa.register_lock);
2163	spufs_get_proxydma_info(ctx, info: &info);
2164	spin_unlock(lock: &ctx->csa.register_lock);
2165	spu_release_saved(ctx);
2166
2167	return simple_read_from_buffer(to: buf, count: len, ppos: pos, from: &info,
2168	available: sizeof(info));
2169	}
2170
2171	static const struct file_operations spufs_proxydma_info_fops = {
2172	.open = spufs_info_open,
2173	.read = spufs_proxydma_info_read,
2174	.llseek = no_llseek,
2175	};
2176
2177	static int spufs_show_tid(struct seq_file *s, void *private)
2178	{
2179	struct spu_context *ctx = s->private;
2180
2181	seq_printf(m: s, fmt: "%d\n", ctx->tid);
2182	return 0;
2183	}
2184
2185	static int spufs_tid_open(struct inode *inode, struct file *file)
2186	{
2187	return single_open(file, spufs_show_tid, SPUFS_I(inode)->i_ctx);
2188	}
2189
2190	static const struct file_operations spufs_tid_fops = {
2191	.open = spufs_tid_open,
2192	.read = seq_read,
2193	.llseek = seq_lseek,
2194	.release = single_release,
2195	};
2196
2197	static const char *ctx_state_names[] = {
2198	"user", "system", "iowait", "loaded"
2199	};
2200
2201	static unsigned long long spufs_acct_time(struct spu_context *ctx,
2202	enum spu_utilization_state state)
2203	{
2204	unsigned long long time = ctx->stats.times[state];
2205
2206	/*
2207	* In general, utilization statistics are updated by the controlling
2208	* thread as the spu context moves through various well defined
2209	* state transitions, but if the context is lazily loaded its
2210	* utilization statistics are not updated as the controlling thread
2211	* is not tightly coupled with the execution of the spu context. We
2212	* calculate and apply the time delta from the last recorded state
2213	* of the spu context.
2214	*/
2215	if (ctx->spu && ctx->stats.util_state == state) {
2216	time += ktime_get_ns() - ctx->stats.tstamp;
2217	}
2218
2219	return time / NSEC_PER_MSEC;
2220	}
2221
2222	static unsigned long long spufs_slb_flts(struct spu_context *ctx)
2223	{
2224	unsigned long long slb_flts = ctx->stats.slb_flt;
2225
2226	if (ctx->state == SPU_STATE_RUNNABLE) {
2227	slb_flts += (ctx->spu->stats.slb_flt -
2228	ctx->stats.slb_flt_base);
2229	}
2230
2231	return slb_flts;
2232	}
2233
2234	static unsigned long long spufs_class2_intrs(struct spu_context *ctx)
2235	{
2236	unsigned long long class2_intrs = ctx->stats.class2_intr;
2237
2238	if (ctx->state == SPU_STATE_RUNNABLE) {
2239	class2_intrs += (ctx->spu->stats.class2_intr -
2240	ctx->stats.class2_intr_base);
2241	}
2242
2243	return class2_intrs;
2244	}
2245
2246
2247	static int spufs_show_stat(struct seq_file *s, void *private)
2248	{
2249	struct spu_context *ctx = s->private;
2250	int ret;
2251
2252	ret = spu_acquire(ctx);
2253	if (ret)
2254	return ret;
2255
2256	seq_printf(m: s, fmt: "%s %llu %llu %llu %llu "
2257	"%llu %llu %llu %llu %llu %llu %llu %llu\n",
2258	ctx_state_names[ctx->stats.util_state],
2259	spufs_acct_time(ctx, state: SPU_UTIL_USER),
2260	spufs_acct_time(ctx, state: SPU_UTIL_SYSTEM),
2261	spufs_acct_time(ctx, state: SPU_UTIL_IOWAIT),
2262	spufs_acct_time(ctx, state: SPU_UTIL_IDLE_LOADED),
2263	ctx->stats.vol_ctx_switch,
2264	ctx->stats.invol_ctx_switch,
2265	spufs_slb_flts(ctx),
2266	ctx->stats.hash_flt,
2267	ctx->stats.min_flt,
2268	ctx->stats.maj_flt,
2269	spufs_class2_intrs(ctx),
2270	ctx->stats.libassist);
2271	spu_release(ctx);
2272	return 0;
2273	}
2274
2275	static int spufs_stat_open(struct inode *inode, struct file *file)
2276	{
2277	return single_open(file, spufs_show_stat, SPUFS_I(inode)->i_ctx);
2278	}
2279
2280	static const struct file_operations spufs_stat_fops = {
2281	.open = spufs_stat_open,
2282	.read = seq_read,
2283	.llseek = seq_lseek,
2284	.release = single_release,
2285	};
2286
2287	static inline int spufs_switch_log_used(struct spu_context *ctx)
2288	{
2289	return (ctx->switch_log->head - ctx->switch_log->tail) %
2290	SWITCH_LOG_BUFSIZE;
2291	}
2292
2293	static inline int spufs_switch_log_avail(struct spu_context *ctx)
2294	{
2295	return SWITCH_LOG_BUFSIZE - spufs_switch_log_used(ctx);
2296	}
2297
2298	static int spufs_switch_log_open(struct inode *inode, struct file *file)
2299	{
2300	struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2301	int rc;
2302
2303	rc = spu_acquire(ctx);
2304	if (rc)
2305	return rc;
2306
2307	if (ctx->switch_log) {
2308	rc = -EBUSY;
2309	goto out;
2310	}
2311
2312	ctx->switch_log = kmalloc(struct_size(ctx->switch_log, log,
2313	SWITCH_LOG_BUFSIZE), GFP_KERNEL);
2314
2315	if (!ctx->switch_log) {
2316	rc = -ENOMEM;
2317	goto out;
2318	}
2319
2320	ctx->switch_log->head = ctx->switch_log->tail = 0;
2321	init_waitqueue_head(&ctx->switch_log->wait);
2322	rc = 0;
2323
2324	out:
2325	spu_release(ctx);
2326	return rc;
2327	}
2328
2329	static int spufs_switch_log_release(struct inode *inode, struct file *file)
2330	{
2331	struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2332	int rc;
2333
2334	rc = spu_acquire(ctx);
2335	if (rc)
2336	return rc;
2337
2338	kfree(objp: ctx->switch_log);
2339	ctx->switch_log = NULL;
2340	spu_release(ctx);
2341
2342	return 0;
2343	}
2344
2345	static int switch_log_sprint(struct spu_context *ctx, char *tbuf, int n)
2346	{
2347	struct switch_log_entry *p;
2348
2349	p = ctx->switch_log->log + ctx->switch_log->tail % SWITCH_LOG_BUFSIZE;
2350
2351	return snprintf(buf: tbuf, size: n, fmt: "%llu.%09u %d %u %u %llu\n",
2352	(unsigned long long) p->tstamp.tv_sec,
2353	(unsigned int) p->tstamp.tv_nsec,
2354	p->spu_id,
2355	(unsigned int) p->type,
2356	(unsigned int) p->val,
2357	(unsigned long long) p->timebase);
2358	}
2359
2360	static ssize_t spufs_switch_log_read(struct file *file, char __user *buf,
2361	size_t len, loff_t *ppos)
2362	{
2363	struct inode *inode = file_inode(f: file);
2364	struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2365	int error = 0, cnt = 0;
2366
2367	if (!buf)
2368	return -EINVAL;
2369
2370	error = spu_acquire(ctx);
2371	if (error)
2372	return error;
2373
2374	while (cnt < len) {
2375	char tbuf[128];
2376	int width;
2377
2378	if (spufs_switch_log_used(ctx) == 0) {
2379	if (cnt > 0) {
2380	/* If there's data ready to go, we can
2381	* just return straight away */
2382	break;
2383
2384	} else if (file->f_flags & O_NONBLOCK) {
2385	error = -EAGAIN;
2386	break;
2387
2388	} else {
2389	/* spufs_wait will drop the mutex and
2390	* re-acquire, but since we're in read(), the
2391	* file cannot be _released (and so
2392	* ctx->switch_log is stable).
2393	*/
2394	error = spufs_wait(ctx->switch_log->wait,
2395	spufs_switch_log_used(ctx) > 0);
2396
2397	/* On error, spufs_wait returns without the
2398	* state mutex held */
2399	if (error)
2400	return error;
2401
2402	/* We may have had entries read from underneath
2403	* us while we dropped the mutex in spufs_wait,
2404	* so re-check */
2405	if (spufs_switch_log_used(ctx) == 0)
2406	continue;
2407	}
2408	}
2409
2410	width = switch_log_sprint(ctx, tbuf, n: sizeof(tbuf));
2411	if (width < len)
2412	ctx->switch_log->tail =
2413	(ctx->switch_log->tail + 1) %
2414	SWITCH_LOG_BUFSIZE;
2415	else
2416	/* If the record is greater than space available return
2417	* partial buffer (so far) */
2418	break;
2419
2420	error = copy_to_user(to: buf + cnt, from: tbuf, n: width);
2421	if (error)
2422	break;
2423	cnt += width;
2424	}
2425
2426	spu_release(ctx);
2427
2428	return cnt == 0 ? error : cnt;
2429	}
2430
2431	static __poll_t spufs_switch_log_poll(struct file *file, poll_table *wait)
2432	{
2433	struct inode *inode = file_inode(f: file);
2434	struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2435	__poll_t mask = 0;
2436	int rc;
2437
2438	poll_wait(filp: file, wait_address: &ctx->switch_log->wait, p: wait);
2439
2440	rc = spu_acquire(ctx);
2441	if (rc)
2442	return rc;
2443
2444	if (spufs_switch_log_used(ctx) > 0)
2445	mask |= EPOLLIN;
2446
2447	spu_release(ctx);
2448
2449	return mask;
2450	}
2451
2452	static const struct file_operations spufs_switch_log_fops = {
2453	.open = spufs_switch_log_open,
2454	.read = spufs_switch_log_read,
2455	.poll = spufs_switch_log_poll,
2456	.release = spufs_switch_log_release,
2457	.llseek = no_llseek,
2458	};
2459
2460	/**
2461	* Log a context switch event to a switch log reader.
2462	*
2463	* Must be called with ctx->state_mutex held.
2464	*/
2465	void spu_switch_log_notify(struct spu *spu, struct spu_context *ctx,
2466	u32 type, u32 val)
2467	{
2468	if (!ctx->switch_log)
2469	return;
2470
2471	if (spufs_switch_log_avail(ctx) > 1) {
2472	struct switch_log_entry *p;
2473
2474	p = ctx->switch_log->log + ctx->switch_log->head;
2475	ktime_get_ts64(ts: &p->tstamp);
2476	p->timebase = get_tb();
2477	p->spu_id = spu ? spu->number : -1;
2478	p->type = type;
2479	p->val = val;
2480
2481	ctx->switch_log->head =
2482	(ctx->switch_log->head + 1) % SWITCH_LOG_BUFSIZE;
2483	}
2484
2485	wake_up(&ctx->switch_log->wait);
2486	}
2487
2488	static int spufs_show_ctx(struct seq_file *s, void *private)
2489	{
2490	struct spu_context *ctx = s->private;
2491	u64 mfc_control_RW;
2492
2493	mutex_lock(&ctx->state_mutex);
2494	if (ctx->spu) {
2495	struct spu *spu = ctx->spu;
2496	struct spu_priv2 __iomem *priv2 = spu->priv2;
2497
2498	spin_lock_irq(lock: &spu->register_lock);
2499	mfc_control_RW = in_be64(&priv2->mfc_control_RW);
2500	spin_unlock_irq(lock: &spu->register_lock);
2501	} else {
2502	struct spu_state *csa = &ctx->csa;
2503
2504	mfc_control_RW = csa->priv2.mfc_control_RW;
2505	}
2506
2507	seq_printf(m: s, fmt: "%c flgs(%lx) sflgs(%lx) pri(%d) ts(%d) spu(%02d)"
2508	" %c %llx %llx %llx %llx %x %x\n",
2509	ctx->state == SPU_STATE_SAVED ? 'S' : 'R',
2510	ctx->flags,
2511	ctx->sched_flags,
2512	ctx->prio,
2513	ctx->time_slice,
2514	ctx->spu ? ctx->spu->number : -1,
2515	!list_empty(head: &ctx->rq) ? 'q' : ' ',
2516	ctx->csa.class_0_pending,
2517	ctx->csa.class_0_dar,
2518	ctx->csa.class_1_dsisr,
2519	mfc_control_RW,
2520	ctx->ops->runcntl_read(ctx),
2521	ctx->ops->status_read(ctx));
2522
2523	mutex_unlock(lock: &ctx->state_mutex);
2524
2525	return 0;
2526	}
2527
2528	static int spufs_ctx_open(struct inode *inode, struct file *file)
2529	{
2530	return single_open(file, spufs_show_ctx, SPUFS_I(inode)->i_ctx);
2531	}
2532
2533	static const struct file_operations spufs_ctx_fops = {
2534	.open = spufs_ctx_open,
2535	.read = seq_read,
2536	.llseek = seq_lseek,
2537	.release = single_release,
2538	};
2539
2540	const struct spufs_tree_descr spufs_dir_contents[] = {
2541	{ "capabilities", &spufs_caps_fops, 0444, },
2542	{ "mem", &spufs_mem_fops, 0666, LS_SIZE, },
2543	{ "regs", &spufs_regs_fops, 0666, sizeof(struct spu_reg128[128]), },
2544	{ "mbox", &spufs_mbox_fops, 0444, },
2545	{ "ibox", &spufs_ibox_fops, 0444, },
2546	{ "wbox", &spufs_wbox_fops, 0222, },
2547	{ "mbox_stat", &spufs_mbox_stat_fops, 0444, sizeof(u32), },
2548	{ "ibox_stat", &spufs_ibox_stat_fops, 0444, sizeof(u32), },
2549	{ "wbox_stat", &spufs_wbox_stat_fops, 0444, sizeof(u32), },
2550	{ "signal1", &spufs_signal1_fops, 0666, },
2551	{ "signal2", &spufs_signal2_fops, 0666, },
2552	{ "signal1_type", &spufs_signal1_type, 0666, },
2553	{ "signal2_type", &spufs_signal2_type, 0666, },
2554	{ "cntl", &spufs_cntl_fops, 0666, },
2555	{ "fpcr", &spufs_fpcr_fops, 0666, sizeof(struct spu_reg128), },
2556	{ "lslr", &spufs_lslr_ops, 0444, },
2557	{ "mfc", &spufs_mfc_fops, 0666, },
2558	{ "mss", &spufs_mss_fops, 0666, },
2559	{ "npc", &spufs_npc_ops, 0666, },
2560	{ "srr0", &spufs_srr0_ops, 0666, },
2561	{ "decr", &spufs_decr_ops, 0666, },
2562	{ "decr_status", &spufs_decr_status_ops, 0666, },
2563	{ "event_mask", &spufs_event_mask_ops, 0666, },
2564	{ "event_status", &spufs_event_status_ops, 0444, },
2565	{ "psmap", &spufs_psmap_fops, 0666, SPUFS_PS_MAP_SIZE, },
2566	{ "phys-id", &spufs_id_ops, 0666, },
2567	{ "object-id", &spufs_object_id_ops, 0666, },
2568	{ "mbox_info", &spufs_mbox_info_fops, 0444, sizeof(u32), },
2569	{ "ibox_info", &spufs_ibox_info_fops, 0444, sizeof(u32), },
2570	{ "wbox_info", &spufs_wbox_info_fops, 0444, sizeof(u32), },
2571	{ "dma_info", &spufs_dma_info_fops, 0444,
2572	sizeof(struct spu_dma_info), },
2573	{ "proxydma_info", &spufs_proxydma_info_fops, 0444,
2574	sizeof(struct spu_proxydma_info)},
2575	{ "tid", &spufs_tid_fops, 0444, },
2576	{ "stat", &spufs_stat_fops, 0444, },
2577	{ "switch_log", &spufs_switch_log_fops, 0444 },
2578	{},
2579	};
2580
2581	const struct spufs_tree_descr spufs_dir_nosched_contents[] = {
2582	{ "capabilities", &spufs_caps_fops, 0444, },
2583	{ "mem", &spufs_mem_fops, 0666, LS_SIZE, },
2584	{ "mbox", &spufs_mbox_fops, 0444, },
2585	{ "ibox", &spufs_ibox_fops, 0444, },
2586	{ "wbox", &spufs_wbox_fops, 0222, },
2587	{ "mbox_stat", &spufs_mbox_stat_fops, 0444, sizeof(u32), },
2588	{ "ibox_stat", &spufs_ibox_stat_fops, 0444, sizeof(u32), },
2589	{ "wbox_stat", &spufs_wbox_stat_fops, 0444, sizeof(u32), },
2590	{ "signal1", &spufs_signal1_nosched_fops, 0222, },
2591	{ "signal2", &spufs_signal2_nosched_fops, 0222, },
2592	{ "signal1_type", &spufs_signal1_type, 0666, },
2593	{ "signal2_type", &spufs_signal2_type, 0666, },
2594	{ "mss", &spufs_mss_fops, 0666, },
2595	{ "mfc", &spufs_mfc_fops, 0666, },
2596	{ "cntl", &spufs_cntl_fops, 0666, },
2597	{ "npc", &spufs_npc_ops, 0666, },
2598	{ "psmap", &spufs_psmap_fops, 0666, SPUFS_PS_MAP_SIZE, },
2599	{ "phys-id", &spufs_id_ops, 0666, },
2600	{ "object-id", &spufs_object_id_ops, 0666, },
2601	{ "tid", &spufs_tid_fops, 0444, },
2602	{ "stat", &spufs_stat_fops, 0444, },
2603	{},
2604	};
2605
2606	const struct spufs_tree_descr spufs_dir_debug_contents[] = {
2607	{ ".ctx", &spufs_ctx_fops, 0444, },
2608	{},
2609	};
2610
2611	const struct spufs_coredump_reader spufs_coredump_read[] = {
2612	{ "regs", spufs_regs_dump, NULL, sizeof(struct spu_reg128[128])},
2613	{ "fpcr", spufs_fpcr_dump, NULL, sizeof(struct spu_reg128) },
2614	{ "lslr", NULL, spufs_lslr_get, 19 },
2615	{ "decr", NULL, spufs_decr_get, 19 },
2616	{ "decr_status", NULL, spufs_decr_status_get, 19 },
2617	{ "mem", spufs_mem_dump, NULL, LS_SIZE, },
2618	{ "signal1", spufs_signal1_dump, NULL, sizeof(u32) },
2619	{ "signal1_type", NULL, spufs_signal1_type_get, 19 },
2620	{ "signal2", spufs_signal2_dump, NULL, sizeof(u32) },
2621	{ "signal2_type", NULL, spufs_signal2_type_get, 19 },
2622	{ "event_mask", NULL, spufs_event_mask_get, 19 },
2623	{ "event_status", NULL, spufs_event_status_get, 19 },
2624	{ "mbox_info", spufs_mbox_info_dump, NULL, sizeof(u32) },
2625	{ "ibox_info", spufs_ibox_info_dump, NULL, sizeof(u32) },
2626	{ "wbox_info", spufs_wbox_info_dump, NULL, 4 * sizeof(u32)},
2627	{ "dma_info", spufs_dma_info_dump, NULL, sizeof(struct spu_dma_info)},
2628	{ "proxydma_info", spufs_proxydma_info_dump,
2629	NULL, sizeof(struct spu_proxydma_info)},
2630	{ "object-id", NULL, spufs_object_id_get, 19 },
2631	{ "npc", NULL, spufs_npc_get, 19 },
2632	{ NULL },
2633	};
2634