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, 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	.mmap = spufs_cntl_mmap,
457	};
458
459	static int
460	spufs_regs_open(struct inode *inode, struct file *file)
461	{
462	struct spufs_inode_info *i = SPUFS_I(inode);
463	file->private_data = i->i_ctx;
464	return 0;
465	}
466
467	static ssize_t
468	spufs_regs_dump(struct spu_context *ctx, struct coredump_params *cprm)
469	{
470	return spufs_dump_emit(cprm, buf: ctx->csa.lscsa->gprs,
471	size: sizeof(ctx->csa.lscsa->gprs));
472	}
473
474	static ssize_t
475	spufs_regs_read(struct file *file, char __user *buffer,
476	size_t size, loff_t *pos)
477	{
478	int ret;
479	struct spu_context *ctx = file->private_data;
480
481	/* pre-check for file position: if we'd return EOF, there's no point
482	* causing a deschedule */
483	if (*pos >= sizeof(ctx->csa.lscsa->gprs))
484	return 0;
485
486	ret = spu_acquire_saved(ctx);
487	if (ret)
488	return ret;
489	ret = simple_read_from_buffer(to: buffer, count: size, ppos: pos, from: ctx->csa.lscsa->gprs,
490	available: sizeof(ctx->csa.lscsa->gprs));
491	spu_release_saved(ctx);
492	return ret;
493	}
494
495	static ssize_t
496	spufs_regs_write(struct file *file, const char __user *buffer,
497	size_t size, loff_t *pos)
498	{
499	struct spu_context *ctx = file->private_data;
500	struct spu_lscsa *lscsa = ctx->csa.lscsa;
501	int ret;
502
503	if (*pos >= sizeof(lscsa->gprs))
504	return -EFBIG;
505
506	ret = spu_acquire_saved(ctx);
507	if (ret)
508	return ret;
509
510	size = simple_write_to_buffer(to: lscsa->gprs, available: sizeof(lscsa->gprs), ppos: pos,
511	from: buffer, count: size);
512
513	spu_release_saved(ctx);
514	return size;
515	}
516
517	static const struct file_operations spufs_regs_fops = {
518	.open = spufs_regs_open,
519	.read = spufs_regs_read,
520	.write = spufs_regs_write,
521	.llseek = generic_file_llseek,
522	};
523
524	static ssize_t
525	spufs_fpcr_dump(struct spu_context *ctx, struct coredump_params *cprm)
526	{
527	return spufs_dump_emit(cprm, buf: &ctx->csa.lscsa->fpcr,
528	size: sizeof(ctx->csa.lscsa->fpcr));
529	}
530
531	static ssize_t
532	spufs_fpcr_read(struct file *file, char __user * buffer,
533	size_t size, loff_t * pos)
534	{
535	int ret;
536	struct spu_context *ctx = file->private_data;
537
538	ret = spu_acquire_saved(ctx);
539	if (ret)
540	return ret;
541	ret = simple_read_from_buffer(to: buffer, count: size, ppos: pos, from: &ctx->csa.lscsa->fpcr,
542	available: sizeof(ctx->csa.lscsa->fpcr));
543	spu_release_saved(ctx);
544	return ret;
545	}
546
547	static ssize_t
548	spufs_fpcr_write(struct file *file, const char __user * buffer,
549	size_t size, loff_t * pos)
550	{
551	struct spu_context *ctx = file->private_data;
552	struct spu_lscsa *lscsa = ctx->csa.lscsa;
553	int ret;
554
555	if (*pos >= sizeof(lscsa->fpcr))
556	return -EFBIG;
557
558	ret = spu_acquire_saved(ctx);
559	if (ret)
560	return ret;
561
562	size = simple_write_to_buffer(to: &lscsa->fpcr, available: sizeof(lscsa->fpcr), ppos: pos,
563	from: buffer, count: size);
564
565	spu_release_saved(ctx);
566	return size;
567	}
568
569	static const struct file_operations spufs_fpcr_fops = {
570	.open = spufs_regs_open,
571	.read = spufs_fpcr_read,
572	.write = spufs_fpcr_write,
573	.llseek = generic_file_llseek,
574	};
575
576	/* generic open function for all pipe-like files */
577	static int spufs_pipe_open(struct inode *inode, struct file *file)
578	{
579	struct spufs_inode_info *i = SPUFS_I(inode);
580	file->private_data = i->i_ctx;
581
582	return stream_open(inode, filp: file);
583	}
584
585	/*
586	* Read as many bytes from the mailbox as possible, until
587	* one of the conditions becomes true:
588	*
589	* - no more data available in the mailbox
590	* - end of the user provided buffer
591	* - end of the mapped area
592	*/
593	static ssize_t spufs_mbox_read(struct file *file, char __user *buf,
594	size_t len, loff_t *pos)
595	{
596	struct spu_context *ctx = file->private_data;
597	u32 mbox_data, __user *udata = (void __user *)buf;
598	ssize_t count;
599
600	if (len < 4)
601	return -EINVAL;
602
603	count = spu_acquire(ctx);
604	if (count)
605	return count;
606
607	for (count = 0; (count + 4) <= len; count += 4, udata++) {
608	int ret;
609	ret = ctx->ops->mbox_read(ctx, &mbox_data);
610	if (ret == 0)
611	break;
612
613	/*
614	* at the end of the mapped area, we can fault
615	* but still need to return the data we have
616	* read successfully so far.
617	*/
618	ret = put_user(mbox_data, udata);
619	if (ret) {
620	if (!count)
621	count = -EFAULT;
622	break;
623	}
624	}
625	spu_release(ctx);
626
627	if (!count)
628	count = -EAGAIN;
629
630	return count;
631	}
632
633	static const struct file_operations spufs_mbox_fops = {
634	.open = spufs_pipe_open,
635	.read = spufs_mbox_read,
636	};
637
638	static ssize_t spufs_mbox_stat_read(struct file *file, char __user *buf,
639	size_t len, loff_t *pos)
640	{
641	struct spu_context *ctx = file->private_data;
642	ssize_t ret;
643	u32 mbox_stat;
644
645	if (len < 4)
646	return -EINVAL;
647
648	ret = spu_acquire(ctx);
649	if (ret)
650	return ret;
651
652	mbox_stat = ctx->ops->mbox_stat_read(ctx) & 0xff;
653
654	spu_release(ctx);
655
656	if (copy_to_user(to: buf, from: &mbox_stat, n: sizeof mbox_stat))
657	return -EFAULT;
658
659	return 4;
660	}
661
662	static const struct file_operations spufs_mbox_stat_fops = {
663	.open = spufs_pipe_open,
664	.read = spufs_mbox_stat_read,
665	};
666
667	/* low-level ibox access function */
668	size_t spu_ibox_read(struct spu_context *ctx, u32 *data)
669	{
670	return ctx->ops->ibox_read(ctx, data);
671	}
672
673	/* interrupt-level ibox callback function. */
674	void spufs_ibox_callback(struct spu *spu)
675	{
676	struct spu_context *ctx = spu->ctx;
677
678	if (ctx)
679	wake_up_all(&ctx->ibox_wq);
680	}
681
682	/*
683	* Read as many bytes from the interrupt mailbox as possible, until
684	* one of the conditions becomes true:
685	*
686	* - no more data available in the mailbox
687	* - end of the user provided buffer
688	* - end of the mapped area
689	*
690	* If the file is opened without O_NONBLOCK, we wait here until
691	* any data is available, but return when we have been able to
692	* read something.
693	*/
694	static ssize_t spufs_ibox_read(struct file *file, char __user *buf,
695	size_t len, loff_t *pos)
696	{
697	struct spu_context *ctx = file->private_data;
698	u32 ibox_data, __user *udata = (void __user *)buf;
699	ssize_t count;
700
701	if (len < 4)
702	return -EINVAL;
703
704	count = spu_acquire(ctx);
705	if (count)
706	goto out;
707
708	/* wait only for the first element */
709	count = 0;
710	if (file->f_flags & O_NONBLOCK) {
711	if (!spu_ibox_read(ctx, data: &ibox_data)) {
712	count = -EAGAIN;
713	goto out_unlock;
714	}
715	} else {
716	count = spufs_wait(ctx->ibox_wq, spu_ibox_read(ctx, &ibox_data));
717	if (count)
718	goto out;
719	}
720
721	/* if we can't write at all, return -EFAULT */
722	count = put_user(ibox_data, udata);
723	if (count)
724	goto out_unlock;
725
726	for (count = 4, udata++; (count + 4) <= len; count += 4, udata++) {
727	int ret;
728	ret = ctx->ops->ibox_read(ctx, &ibox_data);
729	if (ret == 0)
730	break;
731	/*
732	* at the end of the mapped area, we can fault
733	* but still need to return the data we have
734	* read successfully so far.
735	*/
736	ret = put_user(ibox_data, udata);
737	if (ret)
738	break;
739	}
740
741	out_unlock:
742	spu_release(ctx);
743	out:
744	return count;
745	}
746
747	static __poll_t spufs_ibox_poll(struct file *file, poll_table *wait)
748	{
749	struct spu_context *ctx = file->private_data;
750	__poll_t mask;
751
752	poll_wait(filp: file, wait_address: &ctx->ibox_wq, p: wait);
753
754	/*
755	* For now keep this uninterruptible and also ignore the rule
756	* that poll should not sleep. Will be fixed later.
757	*/
758	mutex_lock(&ctx->state_mutex);
759	mask = ctx->ops->mbox_stat_poll(ctx, EPOLLIN | EPOLLRDNORM);
760	spu_release(ctx);
761
762	return mask;
763	}
764
765	static const struct file_operations spufs_ibox_fops = {
766	.open = spufs_pipe_open,
767	.read = spufs_ibox_read,
768	.poll = spufs_ibox_poll,
769	};
770
771	static ssize_t spufs_ibox_stat_read(struct file *file, char __user *buf,
772	size_t len, loff_t *pos)
773	{
774	struct spu_context *ctx = file->private_data;
775	ssize_t ret;
776	u32 ibox_stat;
777
778	if (len < 4)
779	return -EINVAL;
780
781	ret = spu_acquire(ctx);
782	if (ret)
783	return ret;
784	ibox_stat = (ctx->ops->mbox_stat_read(ctx) >> 16) & 0xff;
785	spu_release(ctx);
786
787	if (copy_to_user(to: buf, from: &ibox_stat, n: sizeof ibox_stat))
788	return -EFAULT;
789
790	return 4;
791	}
792
793	static const struct file_operations spufs_ibox_stat_fops = {
794	.open = spufs_pipe_open,
795	.read = spufs_ibox_stat_read,
796	};
797
798	/* low-level mailbox write */
799	size_t spu_wbox_write(struct spu_context *ctx, u32 data)
800	{
801	return ctx->ops->wbox_write(ctx, data);
802	}
803
804	/* interrupt-level wbox callback function. */
805	void spufs_wbox_callback(struct spu *spu)
806	{
807	struct spu_context *ctx = spu->ctx;
808
809	if (ctx)
810	wake_up_all(&ctx->wbox_wq);
811	}
812
813	/*
814	* Write as many bytes to the interrupt mailbox as possible, until
815	* one of the conditions becomes true:
816	*
817	* - the mailbox is full
818	* - end of the user provided buffer
819	* - end of the mapped area
820	*
821	* If the file is opened without O_NONBLOCK, we wait here until
822	* space is available, but return when we have been able to
823	* write something.
824	*/
825	static ssize_t spufs_wbox_write(struct file *file, const char __user *buf,
826	size_t len, loff_t *pos)
827	{
828	struct spu_context *ctx = file->private_data;
829	u32 wbox_data, __user *udata = (void __user *)buf;
830	ssize_t count;
831
832	if (len < 4)
833	return -EINVAL;
834
835	if (get_user(wbox_data, udata))
836	return -EFAULT;
837
838	count = spu_acquire(ctx);
839	if (count)
840	goto out;
841
842	/*
843	* make sure we can at least write one element, by waiting
844	* in case of !O_NONBLOCK
845	*/
846	count = 0;
847	if (file->f_flags & O_NONBLOCK) {
848	if (!spu_wbox_write(ctx, data: wbox_data)) {
849	count = -EAGAIN;
850	goto out_unlock;
851	}
852	} else {
853	count = spufs_wait(ctx->wbox_wq, spu_wbox_write(ctx, wbox_data));
854	if (count)
855	goto out;
856	}
857
858
859	/* write as much as possible */
860	for (count = 4, udata++; (count + 4) <= len; count += 4, udata++) {
861	int ret;
862	ret = get_user(wbox_data, udata);
863	if (ret)
864	break;
865
866	ret = spu_wbox_write(ctx, data: wbox_data);
867	if (ret == 0)
868	break;
869	}
870
871	out_unlock:
872	spu_release(ctx);
873	out:
874	return count;
875	}
876
877	static __poll_t spufs_wbox_poll(struct file *file, poll_table *wait)
878	{
879	struct spu_context *ctx = file->private_data;
880	__poll_t mask;
881
882	poll_wait(filp: file, wait_address: &ctx->wbox_wq, p: wait);
883
884	/*
885	* For now keep this uninterruptible and also ignore the rule
886	* that poll should not sleep. Will be fixed later.
887	*/
888	mutex_lock(&ctx->state_mutex);
889	mask = ctx->ops->mbox_stat_poll(ctx, EPOLLOUT | EPOLLWRNORM);
890	spu_release(ctx);
891
892	return mask;
893	}
894
895	static const struct file_operations spufs_wbox_fops = {
896	.open = spufs_pipe_open,
897	.write = spufs_wbox_write,
898	.poll = spufs_wbox_poll,
899	};
900
901	static ssize_t spufs_wbox_stat_read(struct file *file, char __user *buf,
902	size_t len, loff_t *pos)
903	{
904	struct spu_context *ctx = file->private_data;
905	ssize_t ret;
906	u32 wbox_stat;
907
908	if (len < 4)
909	return -EINVAL;
910
911	ret = spu_acquire(ctx);
912	if (ret)
913	return ret;
914	wbox_stat = (ctx->ops->mbox_stat_read(ctx) >> 8) & 0xff;
915	spu_release(ctx);
916
917	if (copy_to_user(to: buf, from: &wbox_stat, n: sizeof wbox_stat))
918	return -EFAULT;
919
920	return 4;
921	}
922
923	static const struct file_operations spufs_wbox_stat_fops = {
924	.open = spufs_pipe_open,
925	.read = spufs_wbox_stat_read,
926	};
927
928	static int spufs_signal1_open(struct inode *inode, struct file *file)
929	{
930	struct spufs_inode_info *i = SPUFS_I(inode);
931	struct spu_context *ctx = i->i_ctx;
932
933	mutex_lock(&ctx->mapping_lock);
934	file->private_data = ctx;
935	if (!i->i_openers++)
936	ctx->signal1 = inode->i_mapping;
937	mutex_unlock(lock: &ctx->mapping_lock);
938	return nonseekable_open(inode, filp: file);
939	}
940
941	static int
942	spufs_signal1_release(struct inode *inode, struct file *file)
943	{
944	struct spufs_inode_info *i = SPUFS_I(inode);
945	struct spu_context *ctx = i->i_ctx;
946
947	mutex_lock(&ctx->mapping_lock);
948	if (!--i->i_openers)
949	ctx->signal1 = NULL;
950	mutex_unlock(lock: &ctx->mapping_lock);
951	return 0;
952	}
953
954	static ssize_t spufs_signal1_dump(struct spu_context *ctx,
955	struct coredump_params *cprm)
956	{
957	if (!ctx->csa.spu_chnlcnt_RW[3])
958	return 0;
959	return spufs_dump_emit(cprm, buf: &ctx->csa.spu_chnldata_RW[3],
960	size: sizeof(ctx->csa.spu_chnldata_RW[3]));
961	}
962
963	static ssize_t __spufs_signal1_read(struct spu_context *ctx, char __user *buf,
964	size_t len)
965	{
966	if (len < sizeof(ctx->csa.spu_chnldata_RW[3]))
967	return -EINVAL;
968	if (!ctx->csa.spu_chnlcnt_RW[3])
969	return 0;
970	if (copy_to_user(to: buf, from: &ctx->csa.spu_chnldata_RW[3],
971	n: sizeof(ctx->csa.spu_chnldata_RW[3])))
972	return -EFAULT;
973	return sizeof(ctx->csa.spu_chnldata_RW[3]);
974	}
975
976	static ssize_t spufs_signal1_read(struct file *file, char __user *buf,
977	size_t len, loff_t *pos)
978	{
979	int ret;
980	struct spu_context *ctx = file->private_data;
981
982	ret = spu_acquire_saved(ctx);
983	if (ret)
984	return ret;
985	ret = __spufs_signal1_read(ctx, buf, len);
986	spu_release_saved(ctx);
987
988	return ret;
989	}
990
991	static ssize_t spufs_signal1_write(struct file *file, const char __user *buf,
992	size_t len, loff_t *pos)
993	{
994	struct spu_context *ctx;
995	ssize_t ret;
996	u32 data;
997
998	ctx = file->private_data;
999
1000	if (len < 4)
1001	return -EINVAL;
1002
1003	if (copy_from_user(to: &data, from: buf, n: 4))
1004	return -EFAULT;
1005
1006	ret = spu_acquire(ctx);
1007	if (ret)
1008	return ret;
1009	ctx->ops->signal1_write(ctx, data);
1010	spu_release(ctx);
1011
1012	return 4;
1013	}
1014
1015	static vm_fault_t
1016	spufs_signal1_mmap_fault(struct vm_fault *vmf)
1017	{
1018	#if SPUFS_SIGNAL_MAP_SIZE == 0x1000
1019	return spufs_ps_fault(vmf, ps_offs: 0x14000, SPUFS_SIGNAL_MAP_SIZE);
1020	#elif SPUFS_SIGNAL_MAP_SIZE == 0x10000
1021	/* For 64k pages, both signal1 and signal2 can be used to mmap the whole
1022	* signal 1 and 2 area
1023	*/
1024	return spufs_ps_fault(vmf, 0x10000, SPUFS_SIGNAL_MAP_SIZE);
1025	#else
1026	#error unsupported page size
1027	#endif
1028	}
1029
1030	static const struct vm_operations_struct spufs_signal1_mmap_vmops = {
1031	.fault = spufs_signal1_mmap_fault,
1032	};
1033
1034	static int spufs_signal1_mmap(struct file *file, struct vm_area_struct *vma)
1035	{
1036	if (!(vma->vm_flags & VM_SHARED))
1037	return -EINVAL;
1038
1039	vm_flags_set(vma, VM_IO | VM_PFNMAP);
1040	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1041
1042	vma->vm_ops = &spufs_signal1_mmap_vmops;
1043	return 0;
1044	}
1045
1046	static const struct file_operations spufs_signal1_fops = {
1047	.open = spufs_signal1_open,
1048	.release = spufs_signal1_release,
1049	.read = spufs_signal1_read,
1050	.write = spufs_signal1_write,
1051	.mmap = spufs_signal1_mmap,
1052	};
1053
1054	static const struct file_operations spufs_signal1_nosched_fops = {
1055	.open = spufs_signal1_open,
1056	.release = spufs_signal1_release,
1057	.write = spufs_signal1_write,
1058	.mmap = spufs_signal1_mmap,
1059	};
1060
1061	static int spufs_signal2_open(struct inode *inode, struct file *file)
1062	{
1063	struct spufs_inode_info *i = SPUFS_I(inode);
1064	struct spu_context *ctx = i->i_ctx;
1065
1066	mutex_lock(&ctx->mapping_lock);
1067	file->private_data = ctx;
1068	if (!i->i_openers++)
1069	ctx->signal2 = inode->i_mapping;
1070	mutex_unlock(lock: &ctx->mapping_lock);
1071	return nonseekable_open(inode, filp: file);
1072	}
1073
1074	static int
1075	spufs_signal2_release(struct inode *inode, struct file *file)
1076	{
1077	struct spufs_inode_info *i = SPUFS_I(inode);
1078	struct spu_context *ctx = i->i_ctx;
1079
1080	mutex_lock(&ctx->mapping_lock);
1081	if (!--i->i_openers)
1082	ctx->signal2 = NULL;
1083	mutex_unlock(lock: &ctx->mapping_lock);
1084	return 0;
1085	}
1086
1087	static ssize_t spufs_signal2_dump(struct spu_context *ctx,
1088	struct coredump_params *cprm)
1089	{
1090	if (!ctx->csa.spu_chnlcnt_RW[4])
1091	return 0;
1092	return spufs_dump_emit(cprm, buf: &ctx->csa.spu_chnldata_RW[4],
1093	size: sizeof(ctx->csa.spu_chnldata_RW[4]));
1094	}
1095
1096	static ssize_t __spufs_signal2_read(struct spu_context *ctx, char __user *buf,
1097	size_t len)
1098	{
1099	if (len < sizeof(ctx->csa.spu_chnldata_RW[4]))
1100	return -EINVAL;
1101	if (!ctx->csa.spu_chnlcnt_RW[4])
1102	return 0;
1103	if (copy_to_user(to: buf, from: &ctx->csa.spu_chnldata_RW[4],
1104	n: sizeof(ctx->csa.spu_chnldata_RW[4])))
1105	return -EFAULT;
1106	return sizeof(ctx->csa.spu_chnldata_RW[4]);
1107	}
1108
1109	static ssize_t spufs_signal2_read(struct file *file, char __user *buf,
1110	size_t len, loff_t *pos)
1111	{
1112	struct spu_context *ctx = file->private_data;
1113	int ret;
1114
1115	ret = spu_acquire_saved(ctx);
1116	if (ret)
1117	return ret;
1118	ret = __spufs_signal2_read(ctx, buf, len);
1119	spu_release_saved(ctx);
1120
1121	return ret;
1122	}
1123
1124	static ssize_t spufs_signal2_write(struct file *file, const char __user *buf,
1125	size_t len, loff_t *pos)
1126	{
1127	struct spu_context *ctx;
1128	ssize_t ret;
1129	u32 data;
1130
1131	ctx = file->private_data;
1132
1133	if (len < 4)
1134	return -EINVAL;
1135
1136	if (copy_from_user(to: &data, from: buf, n: 4))
1137	return -EFAULT;
1138
1139	ret = spu_acquire(ctx);
1140	if (ret)
1141	return ret;
1142	ctx->ops->signal2_write(ctx, data);
1143	spu_release(ctx);
1144
1145	return 4;
1146	}
1147
1148	#if SPUFS_MMAP_4K
1149	static vm_fault_t
1150	spufs_signal2_mmap_fault(struct vm_fault *vmf)
1151	{
1152	#if SPUFS_SIGNAL_MAP_SIZE == 0x1000
1153	return spufs_ps_fault(vmf, ps_offs: 0x1c000, SPUFS_SIGNAL_MAP_SIZE);
1154	#elif SPUFS_SIGNAL_MAP_SIZE == 0x10000
1155	/* For 64k pages, both signal1 and signal2 can be used to mmap the whole
1156	* signal 1 and 2 area
1157	*/
1158	return spufs_ps_fault(vmf, 0x10000, SPUFS_SIGNAL_MAP_SIZE);
1159	#else
1160	#error unsupported page size
1161	#endif
1162	}
1163
1164	static const struct vm_operations_struct spufs_signal2_mmap_vmops = {
1165	.fault = spufs_signal2_mmap_fault,
1166	};
1167
1168	static int spufs_signal2_mmap(struct file *file, struct vm_area_struct *vma)
1169	{
1170	if (!(vma->vm_flags & VM_SHARED))
1171	return -EINVAL;
1172
1173	vm_flags_set(vma, VM_IO | VM_PFNMAP);
1174	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1175
1176	vma->vm_ops = &spufs_signal2_mmap_vmops;
1177	return 0;
1178	}
1179	#else /* SPUFS_MMAP_4K */
1180	#define spufs_signal2_mmap NULL
1181	#endif /* !SPUFS_MMAP_4K */
1182
1183	static const struct file_operations spufs_signal2_fops = {
1184	.open = spufs_signal2_open,
1185	.release = spufs_signal2_release,
1186	.read = spufs_signal2_read,
1187	.write = spufs_signal2_write,
1188	.mmap = spufs_signal2_mmap,
1189	};
1190
1191	static const struct file_operations spufs_signal2_nosched_fops = {
1192	.open = spufs_signal2_open,
1193	.release = spufs_signal2_release,
1194	.write = spufs_signal2_write,
1195	.mmap = spufs_signal2_mmap,
1196	};
1197
1198	/*
1199	* This is a wrapper around DEFINE_SIMPLE_ATTRIBUTE which does the
1200	* work of acquiring (or not) the SPU context before calling through
1201	* to the actual get routine. The set routine is called directly.
1202	*/
1203	#define SPU_ATTR_NOACQUIRE 0
1204	#define SPU_ATTR_ACQUIRE 1
1205	#define SPU_ATTR_ACQUIRE_SAVED 2
1206
1207	#define DEFINE_SPUFS_ATTRIBUTE(__name, __get, __set, __fmt, __acquire) \
1208	static int __##__get(void *data, u64 *val) \
1209	{ \
1210	struct spu_context *ctx = data; \
1211	int ret = 0; \
1212	\
1213	if (__acquire == SPU_ATTR_ACQUIRE) { \
1214	ret = spu_acquire(ctx); \
1215	if (ret) \
1216	return ret; \
1217	*val = __get(ctx); \
1218	spu_release(ctx); \
1219	} else if (__acquire == SPU_ATTR_ACQUIRE_SAVED) { \
1220	ret = spu_acquire_saved(ctx); \
1221	if (ret) \
1222	return ret; \
1223	*val = __get(ctx); \
1224	spu_release_saved(ctx); \
1225	} else \
1226	*val = __get(ctx); \
1227	\
1228	return 0; \
1229	} \
1230	DEFINE_SPUFS_SIMPLE_ATTRIBUTE(__name, __##__get, __set, __fmt);
1231
1232	static int spufs_signal1_type_set(void *data, u64 val)
1233	{
1234	struct spu_context *ctx = data;
1235	int ret;
1236
1237	ret = spu_acquire(ctx);
1238	if (ret)
1239	return ret;
1240	ctx->ops->signal1_type_set(ctx, val);
1241	spu_release(ctx);
1242
1243	return 0;
1244	}
1245
1246	static u64 spufs_signal1_type_get(struct spu_context *ctx)
1247	{
1248	return ctx->ops->signal1_type_get(ctx);
1249	}
1250	DEFINE_SPUFS_ATTRIBUTE(spufs_signal1_type, spufs_signal1_type_get,
1251	spufs_signal1_type_set, "%llu\n", SPU_ATTR_ACQUIRE);
1252
1253
1254	static int spufs_signal2_type_set(void *data, u64 val)
1255	{
1256	struct spu_context *ctx = data;
1257	int ret;
1258
1259	ret = spu_acquire(ctx);
1260	if (ret)
1261	return ret;
1262	ctx->ops->signal2_type_set(ctx, val);
1263	spu_release(ctx);
1264
1265	return 0;
1266	}
1267
1268	static u64 spufs_signal2_type_get(struct spu_context *ctx)
1269	{
1270	return ctx->ops->signal2_type_get(ctx);
1271	}
1272	DEFINE_SPUFS_ATTRIBUTE(spufs_signal2_type, spufs_signal2_type_get,
1273	spufs_signal2_type_set, "%llu\n", SPU_ATTR_ACQUIRE);
1274
1275	#if SPUFS_MMAP_4K
1276	static vm_fault_t
1277	spufs_mss_mmap_fault(struct vm_fault *vmf)
1278	{
1279	return spufs_ps_fault(vmf, ps_offs: 0x0000, SPUFS_MSS_MAP_SIZE);
1280	}
1281
1282	static const struct vm_operations_struct spufs_mss_mmap_vmops = {
1283	.fault = spufs_mss_mmap_fault,
1284	};
1285
1286	/*
1287	* mmap support for problem state MFC DMA area [0x0000 - 0x0fff].
1288	*/
1289	static int spufs_mss_mmap(struct file *file, struct vm_area_struct *vma)
1290	{
1291	if (!(vma->vm_flags & VM_SHARED))
1292	return -EINVAL;
1293
1294	vm_flags_set(vma, VM_IO | VM_PFNMAP);
1295	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1296
1297	vma->vm_ops = &spufs_mss_mmap_vmops;
1298	return 0;
1299	}
1300	#else /* SPUFS_MMAP_4K */
1301	#define spufs_mss_mmap NULL
1302	#endif /* !SPUFS_MMAP_4K */
1303
1304	static int spufs_mss_open(struct inode *inode, struct file *file)
1305	{
1306	struct spufs_inode_info *i = SPUFS_I(inode);
1307	struct spu_context *ctx = i->i_ctx;
1308
1309	file->private_data = i->i_ctx;
1310
1311	mutex_lock(&ctx->mapping_lock);
1312	if (!i->i_openers++)
1313	ctx->mss = inode->i_mapping;
1314	mutex_unlock(lock: &ctx->mapping_lock);
1315	return nonseekable_open(inode, filp: file);
1316	}
1317
1318	static int
1319	spufs_mss_release(struct inode *inode, struct file *file)
1320	{
1321	struct spufs_inode_info *i = SPUFS_I(inode);
1322	struct spu_context *ctx = i->i_ctx;
1323
1324	mutex_lock(&ctx->mapping_lock);
1325	if (!--i->i_openers)
1326	ctx->mss = NULL;
1327	mutex_unlock(lock: &ctx->mapping_lock);
1328	return 0;
1329	}
1330
1331	static const struct file_operations spufs_mss_fops = {
1332	.open = spufs_mss_open,
1333	.release = spufs_mss_release,
1334	.mmap = spufs_mss_mmap,
1335	};
1336
1337	static vm_fault_t
1338	spufs_psmap_mmap_fault(struct vm_fault *vmf)
1339	{
1340	return spufs_ps_fault(vmf, ps_offs: 0x0000, SPUFS_PS_MAP_SIZE);
1341	}
1342
1343	static const struct vm_operations_struct spufs_psmap_mmap_vmops = {
1344	.fault = spufs_psmap_mmap_fault,
1345	};
1346
1347	/*
1348	* mmap support for full problem state area [0x00000 - 0x1ffff].
1349	*/
1350	static int spufs_psmap_mmap(struct file *file, struct vm_area_struct *vma)
1351	{
1352	if (!(vma->vm_flags & VM_SHARED))
1353	return -EINVAL;
1354
1355	vm_flags_set(vma, VM_IO | VM_PFNMAP);
1356	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1357
1358	vma->vm_ops = &spufs_psmap_mmap_vmops;
1359	return 0;
1360	}
1361
1362	static int spufs_psmap_open(struct inode *inode, struct file *file)
1363	{
1364	struct spufs_inode_info *i = SPUFS_I(inode);
1365	struct spu_context *ctx = i->i_ctx;
1366
1367	mutex_lock(&ctx->mapping_lock);
1368	file->private_data = i->i_ctx;
1369	if (!i->i_openers++)
1370	ctx->psmap = inode->i_mapping;
1371	mutex_unlock(lock: &ctx->mapping_lock);
1372	return nonseekable_open(inode, filp: file);
1373	}
1374
1375	static int
1376	spufs_psmap_release(struct inode *inode, struct file *file)
1377	{
1378	struct spufs_inode_info *i = SPUFS_I(inode);
1379	struct spu_context *ctx = i->i_ctx;
1380
1381	mutex_lock(&ctx->mapping_lock);
1382	if (!--i->i_openers)
1383	ctx->psmap = NULL;
1384	mutex_unlock(lock: &ctx->mapping_lock);
1385	return 0;
1386	}
1387
1388	static const struct file_operations spufs_psmap_fops = {
1389	.open = spufs_psmap_open,
1390	.release = spufs_psmap_release,
1391	.mmap = spufs_psmap_mmap,
1392	};
1393
1394
1395	#if SPUFS_MMAP_4K
1396	static vm_fault_t
1397	spufs_mfc_mmap_fault(struct vm_fault *vmf)
1398	{
1399	return spufs_ps_fault(vmf, ps_offs: 0x3000, SPUFS_MFC_MAP_SIZE);
1400	}
1401
1402	static const struct vm_operations_struct spufs_mfc_mmap_vmops = {
1403	.fault = spufs_mfc_mmap_fault,
1404	};
1405
1406	/*
1407	* mmap support for problem state MFC DMA area [0x0000 - 0x0fff].
1408	*/
1409	static int spufs_mfc_mmap(struct file *file, struct vm_area_struct *vma)
1410	{
1411	if (!(vma->vm_flags & VM_SHARED))
1412	return -EINVAL;
1413
1414	vm_flags_set(vma, VM_IO | VM_PFNMAP);
1415	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1416
1417	vma->vm_ops = &spufs_mfc_mmap_vmops;
1418	return 0;
1419	}
1420	#else /* SPUFS_MMAP_4K */
1421	#define spufs_mfc_mmap NULL
1422	#endif /* !SPUFS_MMAP_4K */
1423
1424	static int spufs_mfc_open(struct inode *inode, struct file *file)
1425	{
1426	struct spufs_inode_info *i = SPUFS_I(inode);
1427	struct spu_context *ctx = i->i_ctx;
1428
1429	/* we don't want to deal with DMA into other processes */
1430	if (ctx->owner != current->mm)
1431	return -EINVAL;
1432
1433	if (atomic_read(v: &inode->i_count) != 1)
1434	return -EBUSY;
1435
1436	mutex_lock(&ctx->mapping_lock);
1437	file->private_data = ctx;
1438	if (!i->i_openers++)
1439	ctx->mfc = inode->i_mapping;
1440	mutex_unlock(lock: &ctx->mapping_lock);
1441	return nonseekable_open(inode, filp: file);
1442	}
1443
1444	static int
1445	spufs_mfc_release(struct inode *inode, struct file *file)
1446	{
1447	struct spufs_inode_info *i = SPUFS_I(inode);
1448	struct spu_context *ctx = i->i_ctx;
1449
1450	mutex_lock(&ctx->mapping_lock);
1451	if (!--i->i_openers)
1452	ctx->mfc = NULL;
1453	mutex_unlock(lock: &ctx->mapping_lock);
1454	return 0;
1455	}
1456
1457	/* interrupt-level mfc callback function. */
1458	void spufs_mfc_callback(struct spu *spu)
1459	{
1460	struct spu_context *ctx = spu->ctx;
1461
1462	if (ctx)
1463	wake_up_all(&ctx->mfc_wq);
1464	}
1465
1466	static int spufs_read_mfc_tagstatus(struct spu_context *ctx, u32 *status)
1467	{
1468	/* See if there is one tag group is complete */
1469	/* FIXME we need locking around tagwait */
1470	*status = ctx->ops->read_mfc_tagstatus(ctx) & ctx->tagwait;
1471	ctx->tagwait &= ~*status;
1472	if (*status)
1473	return 1;
1474
1475	/* enable interrupt waiting for any tag group,
1476	may silently fail if interrupts are already enabled */
1477	ctx->ops->set_mfc_query(ctx, ctx->tagwait, 1);
1478	return 0;
1479	}
1480
1481	static ssize_t spufs_mfc_read(struct file *file, char __user *buffer,
1482	size_t size, loff_t *pos)
1483	{
1484	struct spu_context *ctx = file->private_data;
1485	int ret = -EINVAL;
1486	u32 status;
1487
1488	if (size != 4)
1489	goto out;
1490
1491	ret = spu_acquire(ctx);
1492	if (ret)
1493	return ret;
1494
1495	ret = -EINVAL;
1496	if (file->f_flags & O_NONBLOCK) {
1497	status = ctx->ops->read_mfc_tagstatus(ctx);
1498	if (!(status & ctx->tagwait))
1499	ret = -EAGAIN;
1500	else
1501	/* XXX(hch): shouldn't we clear ret here? */
1502	ctx->tagwait &= ~status;
1503	} else {
1504	ret = spufs_wait(ctx->mfc_wq,
1505	spufs_read_mfc_tagstatus(ctx, &status));
1506	if (ret)
1507	goto out;
1508	}
1509	spu_release(ctx);
1510
1511	ret = 4;
1512	if (copy_to_user(to: buffer, from: &status, n: 4))
1513	ret = -EFAULT;
1514
1515	out:
1516	return ret;
1517	}
1518
1519	static int spufs_check_valid_dma(struct mfc_dma_command *cmd)
1520	{
1521	pr_debug("queueing DMA %x %llx %x %x %x\n", cmd->lsa,
1522	cmd->ea, cmd->size, cmd->tag, cmd->cmd);
1523
1524	switch (cmd->cmd) {
1525	case MFC_PUT_CMD:
1526	case MFC_PUTF_CMD:
1527	case MFC_PUTB_CMD:
1528	case MFC_GET_CMD:
1529	case MFC_GETF_CMD:
1530	case MFC_GETB_CMD:
1531	break;
1532	default:
1533	pr_debug("invalid DMA opcode %x\n", cmd->cmd);
1534	return -EIO;
1535	}
1536
1537	if ((cmd->lsa & 0xf) != (cmd->ea &0xf)) {
1538	pr_debug("invalid DMA alignment, ea %llx lsa %x\n",
1539	cmd->ea, cmd->lsa);
1540	return -EIO;
1541	}
1542
1543	switch (cmd->size & 0xf) {
1544	case 1:
1545	break;
1546	case 2:
1547	if (cmd->lsa & 1)
1548	goto error;
1549	break;
1550	case 4:
1551	if (cmd->lsa & 3)
1552	goto error;
1553	break;
1554	case 8:
1555	if (cmd->lsa & 7)
1556	goto error;
1557	break;
1558	case 0:
1559	if (cmd->lsa & 15)
1560	goto error;
1561	break;
1562	error:
1563	default:
1564	pr_debug("invalid DMA alignment %x for size %x\n",
1565	cmd->lsa & 0xf, cmd->size);
1566	return -EIO;
1567	}
1568
1569	if (cmd->size > 16 * 1024) {
1570	pr_debug("invalid DMA size %x\n", cmd->size);
1571	return -EIO;
1572	}
1573
1574	if (cmd->tag & 0xfff0) {
1575	/* we reserve the higher tag numbers for kernel use */
1576	pr_debug("invalid DMA tag\n");
1577	return -EIO;
1578	}
1579
1580	if (cmd->class) {
1581	/* not supported in this version */
1582	pr_debug("invalid DMA class\n");
1583	return -EIO;
1584	}
1585
1586	return 0;
1587	}
1588
1589	static int spu_send_mfc_command(struct spu_context *ctx,
1590	struct mfc_dma_command cmd,
1591	int *error)
1592	{
1593	*error = ctx->ops->send_mfc_command(ctx, &cmd);
1594	if (*error == -EAGAIN) {
1595	/* wait for any tag group to complete
1596	so we have space for the new command */
1597	ctx->ops->set_mfc_query(ctx, ctx->tagwait, 1);
1598	/* try again, because the queue might be
1599	empty again */
1600	*error = ctx->ops->send_mfc_command(ctx, &cmd);
1601	if (*error == -EAGAIN)
1602	return 0;
1603	}
1604	return 1;
1605	}
1606
1607	static ssize_t spufs_mfc_write(struct file *file, const char __user *buffer,
1608	size_t size, loff_t *pos)
1609	{
1610	struct spu_context *ctx = file->private_data;
1611	struct mfc_dma_command cmd;
1612	int ret = -EINVAL;
1613
1614	if (size != sizeof cmd)
1615	goto out;
1616
1617	ret = -EFAULT;
1618	if (copy_from_user(to: &cmd, from: buffer, n: sizeof cmd))
1619	goto out;
1620
1621	ret = spufs_check_valid_dma(cmd: &cmd);
1622	if (ret)
1623	goto out;
1624
1625	ret = spu_acquire(ctx);
1626	if (ret)
1627	goto out;
1628
1629	ret = spufs_wait(ctx->run_wq, ctx->state == SPU_STATE_RUNNABLE);
1630	if (ret)
1631	goto out;
1632
1633	if (file->f_flags & O_NONBLOCK) {
1634	ret = ctx->ops->send_mfc_command(ctx, &cmd);
1635	} else {
1636	int status;
1637	ret = spufs_wait(ctx->mfc_wq,
1638	spu_send_mfc_command(ctx, cmd, &status));
1639	if (ret)
1640	goto out;
1641	if (status)
1642	ret = status;
1643	}
1644
1645	if (ret)
1646	goto out_unlock;
1647
1648	ctx->tagwait |= 1 << cmd.tag;
1649	ret = size;
1650
1651	out_unlock:
1652	spu_release(ctx);
1653	out:
1654	return ret;
1655	}
1656
1657	static __poll_t spufs_mfc_poll(struct file *file,poll_table *wait)
1658	{
1659	struct spu_context *ctx = file->private_data;
1660	u32 free_elements, tagstatus;
1661	__poll_t mask;
1662
1663	poll_wait(filp: file, wait_address: &ctx->mfc_wq, p: wait);
1664
1665	/*
1666	* For now keep this uninterruptible and also ignore the rule
1667	* that poll should not sleep. Will be fixed later.
1668	*/
1669	mutex_lock(&ctx->state_mutex);
1670	ctx->ops->set_mfc_query(ctx, ctx->tagwait, 2);
1671	free_elements = ctx->ops->get_mfc_free_elements(ctx);
1672	tagstatus = ctx->ops->read_mfc_tagstatus(ctx);
1673	spu_release(ctx);
1674
1675	mask = 0;
1676	if (free_elements & 0xffff)
1677	mask |= EPOLLOUT | EPOLLWRNORM;
1678	if (tagstatus & ctx->tagwait)
1679	mask |= EPOLLIN | EPOLLRDNORM;
1680
1681	pr_debug("%s: free %d tagstatus %d tagwait %d\n", __func__,
1682	free_elements, tagstatus, ctx->tagwait);
1683
1684	return mask;
1685	}
1686
1687	static int spufs_mfc_flush(struct file *file, fl_owner_t id)
1688	{
1689	struct spu_context *ctx = file->private_data;
1690	int ret;
1691
1692	ret = spu_acquire(ctx);
1693	if (ret)
1694	return ret;
1695
1696	spu_release(ctx);
1697
1698	return 0;
1699	}
1700
1701	static int spufs_mfc_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1702	{
1703	struct inode *inode = file_inode(f: file);
1704	int err = file_write_and_wait_range(file, start, end);
1705	if (!err) {
1706	inode_lock(inode);
1707	err = spufs_mfc_flush(file, NULL);
1708	inode_unlock(inode);
1709	}
1710	return err;
1711	}
1712
1713	static const struct file_operations spufs_mfc_fops = {
1714	.open = spufs_mfc_open,
1715	.release = spufs_mfc_release,
1716	.read = spufs_mfc_read,
1717	.write = spufs_mfc_write,
1718	.poll = spufs_mfc_poll,
1719	.flush = spufs_mfc_flush,
1720	.fsync = spufs_mfc_fsync,
1721	.mmap = spufs_mfc_mmap,
1722	};
1723
1724	static int spufs_npc_set(void *data, u64 val)
1725	{
1726	struct spu_context *ctx = data;
1727	int ret;
1728
1729	ret = spu_acquire(ctx);
1730	if (ret)
1731	return ret;
1732	ctx->ops->npc_write(ctx, val);
1733	spu_release(ctx);
1734
1735	return 0;
1736	}
1737
1738	static u64 spufs_npc_get(struct spu_context *ctx)
1739	{
1740	return ctx->ops->npc_read(ctx);
1741	}
1742	DEFINE_SPUFS_ATTRIBUTE(spufs_npc_ops, spufs_npc_get, spufs_npc_set,
1743	"0x%llx\n", SPU_ATTR_ACQUIRE);
1744
1745	static int spufs_decr_set(void *data, u64 val)
1746	{
1747	struct spu_context *ctx = data;
1748	struct spu_lscsa *lscsa = ctx->csa.lscsa;
1749	int ret;
1750
1751	ret = spu_acquire_saved(ctx);
1752	if (ret)
1753	return ret;
1754	lscsa->decr.slot[0] = (u32) val;
1755	spu_release_saved(ctx);
1756
1757	return 0;
1758	}
1759
1760	static u64 spufs_decr_get(struct spu_context *ctx)
1761	{
1762	struct spu_lscsa *lscsa = ctx->csa.lscsa;
1763	return lscsa->decr.slot[0];
1764	}
1765	DEFINE_SPUFS_ATTRIBUTE(spufs_decr_ops, spufs_decr_get, spufs_decr_set,
1766	"0x%llx\n", SPU_ATTR_ACQUIRE_SAVED);
1767
1768	static int spufs_decr_status_set(void *data, u64 val)
1769	{
1770	struct spu_context *ctx = data;
1771	int ret;
1772
1773	ret = spu_acquire_saved(ctx);
1774	if (ret)
1775	return ret;
1776	if (val)
1777	ctx->csa.priv2.mfc_control_RW |= MFC_CNTL_DECREMENTER_RUNNING;
1778	else
1779	ctx->csa.priv2.mfc_control_RW &= ~MFC_CNTL_DECREMENTER_RUNNING;
1780	spu_release_saved(ctx);
1781
1782	return 0;
1783	}
1784
1785	static u64 spufs_decr_status_get(struct spu_context *ctx)
1786	{
1787	if (ctx->csa.priv2.mfc_control_RW & MFC_CNTL_DECREMENTER_RUNNING)
1788	return SPU_DECR_STATUS_RUNNING;
1789	else
1790	return 0;
1791	}
1792	DEFINE_SPUFS_ATTRIBUTE(spufs_decr_status_ops, spufs_decr_status_get,
1793	spufs_decr_status_set, "0x%llx\n",
1794	SPU_ATTR_ACQUIRE_SAVED);
1795
1796	static int spufs_event_mask_set(void *data, u64 val)
1797	{
1798	struct spu_context *ctx = data;
1799	struct spu_lscsa *lscsa = ctx->csa.lscsa;
1800	int ret;
1801
1802	ret = spu_acquire_saved(ctx);
1803	if (ret)
1804	return ret;
1805	lscsa->event_mask.slot[0] = (u32) val;
1806	spu_release_saved(ctx);
1807
1808	return 0;
1809	}
1810
1811	static u64 spufs_event_mask_get(struct spu_context *ctx)
1812	{
1813	struct spu_lscsa *lscsa = ctx->csa.lscsa;
1814	return lscsa->event_mask.slot[0];
1815	}
1816
1817	DEFINE_SPUFS_ATTRIBUTE(spufs_event_mask_ops, spufs_event_mask_get,
1818	spufs_event_mask_set, "0x%llx\n",
1819	SPU_ATTR_ACQUIRE_SAVED);
1820
1821	static u64 spufs_event_status_get(struct spu_context *ctx)
1822	{
1823	struct spu_state *state = &ctx->csa;
1824	u64 stat;
1825	stat = state->spu_chnlcnt_RW[0];
1826	if (stat)
1827	return state->spu_chnldata_RW[0];
1828	return 0;
1829	}
1830	DEFINE_SPUFS_ATTRIBUTE(spufs_event_status_ops, spufs_event_status_get,
1831	NULL, "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED)
1832
1833	static int spufs_srr0_set(void *data, u64 val)
1834	{
1835	struct spu_context *ctx = data;
1836	struct spu_lscsa *lscsa = ctx->csa.lscsa;
1837	int ret;
1838
1839	ret = spu_acquire_saved(ctx);
1840	if (ret)
1841	return ret;
1842	lscsa->srr0.slot[0] = (u32) val;
1843	spu_release_saved(ctx);
1844
1845	return 0;
1846	}
1847
1848	static u64 spufs_srr0_get(struct spu_context *ctx)
1849	{
1850	struct spu_lscsa *lscsa = ctx->csa.lscsa;
1851	return lscsa->srr0.slot[0];
1852	}
1853	DEFINE_SPUFS_ATTRIBUTE(spufs_srr0_ops, spufs_srr0_get, spufs_srr0_set,
1854	"0x%llx\n", SPU_ATTR_ACQUIRE_SAVED)
1855
1856	static u64 spufs_id_get(struct spu_context *ctx)
1857	{
1858	u64 num;
1859
1860	if (ctx->state == SPU_STATE_RUNNABLE)
1861	num = ctx->spu->number;
1862	else
1863	num = (unsigned int)-1;
1864
1865	return num;
1866	}
1867	DEFINE_SPUFS_ATTRIBUTE(spufs_id_ops, spufs_id_get, NULL, "0x%llx\n",
1868	SPU_ATTR_ACQUIRE)
1869
1870	static u64 spufs_object_id_get(struct spu_context *ctx)
1871	{
1872	/* FIXME: Should there really be no locking here? */
1873	return ctx->object_id;
1874	}
1875
1876	static int spufs_object_id_set(void *data, u64 id)
1877	{
1878	struct spu_context *ctx = data;
1879	ctx->object_id = id;
1880
1881	return 0;
1882	}
1883
1884	DEFINE_SPUFS_ATTRIBUTE(spufs_object_id_ops, spufs_object_id_get,
1885	spufs_object_id_set, "0x%llx\n", SPU_ATTR_NOACQUIRE);
1886
1887	static u64 spufs_lslr_get(struct spu_context *ctx)
1888	{
1889	return ctx->csa.priv2.spu_lslr_RW;
1890	}
1891	DEFINE_SPUFS_ATTRIBUTE(spufs_lslr_ops, spufs_lslr_get, NULL, "0x%llx\n",
1892	SPU_ATTR_ACQUIRE_SAVED);
1893
1894	static int spufs_info_open(struct inode *inode, struct file *file)
1895	{
1896	struct spufs_inode_info *i = SPUFS_I(inode);
1897	struct spu_context *ctx = i->i_ctx;
1898	file->private_data = ctx;
1899	return 0;
1900	}
1901
1902	static int spufs_caps_show(struct seq_file *s, void *private)
1903	{
1904	struct spu_context *ctx = s->private;
1905
1906	if (!(ctx->flags & SPU_CREATE_NOSCHED))
1907	seq_puts(m: s, s: "sched\n");
1908	if (!(ctx->flags & SPU_CREATE_ISOLATE))
1909	seq_puts(m: s, s: "step\n");
1910	return 0;
1911	}
1912
1913	static int spufs_caps_open(struct inode *inode, struct file *file)
1914	{
1915	return single_open(file, spufs_caps_show, SPUFS_I(inode)->i_ctx);
1916	}
1917
1918	static const struct file_operations spufs_caps_fops = {
1919	.open = spufs_caps_open,
1920	.read = seq_read,
1921	.llseek = seq_lseek,
1922	.release = single_release,
1923	};
1924
1925	static ssize_t spufs_mbox_info_dump(struct spu_context *ctx,
1926	struct coredump_params *cprm)
1927	{
1928	if (!(ctx->csa.prob.mb_stat_R & 0x0000ff))
1929	return 0;
1930	return spufs_dump_emit(cprm, buf: &ctx->csa.prob.pu_mb_R,
1931	size: sizeof(ctx->csa.prob.pu_mb_R));
1932	}
1933
1934	static ssize_t spufs_mbox_info_read(struct file *file, char __user *buf,
1935	size_t len, loff_t *pos)
1936	{
1937	struct spu_context *ctx = file->private_data;
1938	u32 stat, data;
1939	int ret;
1940
1941	ret = spu_acquire_saved(ctx);
1942	if (ret)
1943	return ret;
1944	spin_lock(lock: &ctx->csa.register_lock);
1945	stat = ctx->csa.prob.mb_stat_R;
1946	data = ctx->csa.prob.pu_mb_R;
1947	spin_unlock(lock: &ctx->csa.register_lock);
1948	spu_release_saved(ctx);
1949
1950	/* EOF if there's no entry in the mbox */
1951	if (!(stat & 0x0000ff))
1952	return 0;
1953
1954	return simple_read_from_buffer(to: buf, count: len, ppos: pos, from: &data, available: sizeof(data));
1955	}
1956
1957	static const struct file_operations spufs_mbox_info_fops = {
1958	.open = spufs_info_open,
1959	.read = spufs_mbox_info_read,
1960	.llseek = generic_file_llseek,
1961	};
1962
1963	static ssize_t spufs_ibox_info_dump(struct spu_context *ctx,
1964	struct coredump_params *cprm)
1965	{
1966	if (!(ctx->csa.prob.mb_stat_R & 0xff0000))
1967	return 0;
1968	return spufs_dump_emit(cprm, buf: &ctx->csa.priv2.puint_mb_R,
1969	size: sizeof(ctx->csa.priv2.puint_mb_R));
1970	}
1971
1972	static ssize_t spufs_ibox_info_read(struct file *file, char __user *buf,
1973	size_t len, loff_t *pos)
1974	{
1975	struct spu_context *ctx = file->private_data;
1976	u32 stat, data;
1977	int ret;
1978
1979	ret = spu_acquire_saved(ctx);
1980	if (ret)
1981	return ret;
1982	spin_lock(lock: &ctx->csa.register_lock);
1983	stat = ctx->csa.prob.mb_stat_R;
1984	data = ctx->csa.priv2.puint_mb_R;
1985	spin_unlock(lock: &ctx->csa.register_lock);
1986	spu_release_saved(ctx);
1987
1988	/* EOF if there's no entry in the ibox */
1989	if (!(stat & 0xff0000))
1990	return 0;
1991
1992	return simple_read_from_buffer(to: buf, count: len, ppos: pos, from: &data, available: sizeof(data));
1993	}
1994
1995	static const struct file_operations spufs_ibox_info_fops = {
1996	.open = spufs_info_open,
1997	.read = spufs_ibox_info_read,
1998	.llseek = generic_file_llseek,
1999	};
2000
2001	static size_t spufs_wbox_info_cnt(struct spu_context *ctx)
2002	{
2003	return (4 - ((ctx->csa.prob.mb_stat_R & 0x00ff00) >> 8)) * sizeof(u32);
2004	}
2005
2006	static ssize_t spufs_wbox_info_dump(struct spu_context *ctx,
2007	struct coredump_params *cprm)
2008	{
2009	return spufs_dump_emit(cprm, buf: &ctx->csa.spu_mailbox_data,
2010	size: spufs_wbox_info_cnt(ctx));
2011	}
2012
2013	static ssize_t spufs_wbox_info_read(struct file *file, char __user *buf,
2014	size_t len, loff_t *pos)
2015	{
2016	struct spu_context *ctx = file->private_data;
2017	u32 data[ARRAY_SIZE(ctx->csa.spu_mailbox_data)];
2018	int ret, count;
2019
2020	ret = spu_acquire_saved(ctx);
2021	if (ret)
2022	return ret;
2023	spin_lock(lock: &ctx->csa.register_lock);
2024	count = spufs_wbox_info_cnt(ctx);
2025	memcpy(to: &data, from: &ctx->csa.spu_mailbox_data, len: sizeof(data));
2026	spin_unlock(lock: &ctx->csa.register_lock);
2027	spu_release_saved(ctx);
2028
2029	return simple_read_from_buffer(to: buf, count: len, ppos: pos, from: &data,
2030	available: count * sizeof(u32));
2031	}
2032
2033	static const struct file_operations spufs_wbox_info_fops = {
2034	.open = spufs_info_open,
2035	.read = spufs_wbox_info_read,
2036	.llseek = generic_file_llseek,
2037	};
2038
2039	static void spufs_get_dma_info(struct spu_context *ctx,
2040	struct spu_dma_info *info)
2041	{
2042	int i;
2043
2044	info->dma_info_type = ctx->csa.priv2.spu_tag_status_query_RW;
2045	info->dma_info_mask = ctx->csa.lscsa->tag_mask.slot[0];
2046	info->dma_info_status = ctx->csa.spu_chnldata_RW[24];
2047	info->dma_info_stall_and_notify = ctx->csa.spu_chnldata_RW[25];
2048	info->dma_info_atomic_command_status = ctx->csa.spu_chnldata_RW[27];
2049	for (i = 0; i < 16; i++) {
2050	struct mfc_cq_sr *qp = &info->dma_info_command_data[i];
2051	struct mfc_cq_sr *spuqp = &ctx->csa.priv2.spuq[i];
2052
2053	qp->mfc_cq_data0_RW = spuqp->mfc_cq_data0_RW;
2054	qp->mfc_cq_data1_RW = spuqp->mfc_cq_data1_RW;
2055	qp->mfc_cq_data2_RW = spuqp->mfc_cq_data2_RW;
2056	qp->mfc_cq_data3_RW = spuqp->mfc_cq_data3_RW;
2057	}
2058	}
2059
2060	static ssize_t spufs_dma_info_dump(struct spu_context *ctx,
2061	struct coredump_params *cprm)
2062	{
2063	struct spu_dma_info info;
2064
2065	spufs_get_dma_info(ctx, info: &info);
2066	return spufs_dump_emit(cprm, buf: &info, size: sizeof(info));
2067	}
2068
2069	static ssize_t spufs_dma_info_read(struct file *file, char __user *buf,
2070	size_t len, loff_t *pos)
2071	{
2072	struct spu_context *ctx = file->private_data;
2073	struct spu_dma_info info;
2074	int ret;
2075
2076	ret = spu_acquire_saved(ctx);
2077	if (ret)
2078	return ret;
2079	spin_lock(lock: &ctx->csa.register_lock);
2080	spufs_get_dma_info(ctx, info: &info);
2081	spin_unlock(lock: &ctx->csa.register_lock);
2082	spu_release_saved(ctx);
2083
2084	return simple_read_from_buffer(to: buf, count: len, ppos: pos, from: &info,
2085	available: sizeof(info));
2086	}
2087
2088	static const struct file_operations spufs_dma_info_fops = {
2089	.open = spufs_info_open,
2090	.read = spufs_dma_info_read,
2091	};
2092
2093	static void spufs_get_proxydma_info(struct spu_context *ctx,
2094	struct spu_proxydma_info *info)
2095	{
2096	int i;
2097
2098	info->proxydma_info_type = ctx->csa.prob.dma_querytype_RW;
2099	info->proxydma_info_mask = ctx->csa.prob.dma_querymask_RW;
2100	info->proxydma_info_status = ctx->csa.prob.dma_tagstatus_R;
2101
2102	for (i = 0; i < 8; i++) {
2103	struct mfc_cq_sr *qp = &info->proxydma_info_command_data[i];
2104	struct mfc_cq_sr *puqp = &ctx->csa.priv2.puq[i];
2105
2106	qp->mfc_cq_data0_RW = puqp->mfc_cq_data0_RW;
2107	qp->mfc_cq_data1_RW = puqp->mfc_cq_data1_RW;
2108	qp->mfc_cq_data2_RW = puqp->mfc_cq_data2_RW;
2109	qp->mfc_cq_data3_RW = puqp->mfc_cq_data3_RW;
2110	}
2111	}
2112
2113	static ssize_t spufs_proxydma_info_dump(struct spu_context *ctx,
2114	struct coredump_params *cprm)
2115	{
2116	struct spu_proxydma_info info;
2117
2118	spufs_get_proxydma_info(ctx, info: &info);
2119	return spufs_dump_emit(cprm, buf: &info, size: sizeof(info));
2120	}
2121
2122	static ssize_t spufs_proxydma_info_read(struct file *file, char __user *buf,
2123	size_t len, loff_t *pos)
2124	{
2125	struct spu_context *ctx = file->private_data;
2126	struct spu_proxydma_info info;
2127	int ret;
2128
2129	if (len < sizeof(info))
2130	return -EINVAL;
2131
2132	ret = spu_acquire_saved(ctx);
2133	if (ret)
2134	return ret;
2135	spin_lock(lock: &ctx->csa.register_lock);
2136	spufs_get_proxydma_info(ctx, info: &info);
2137	spin_unlock(lock: &ctx->csa.register_lock);
2138	spu_release_saved(ctx);
2139
2140	return simple_read_from_buffer(to: buf, count: len, ppos: pos, from: &info,
2141	available: sizeof(info));
2142	}
2143
2144	static const struct file_operations spufs_proxydma_info_fops = {
2145	.open = spufs_info_open,
2146	.read = spufs_proxydma_info_read,
2147	};
2148
2149	static int spufs_show_tid(struct seq_file *s, void *private)
2150	{
2151	struct spu_context *ctx = s->private;
2152
2153	seq_printf(m: s, fmt: "%d\n", ctx->tid);
2154	return 0;
2155	}
2156
2157	static int spufs_tid_open(struct inode *inode, struct file *file)
2158	{
2159	return single_open(file, spufs_show_tid, SPUFS_I(inode)->i_ctx);
2160	}
2161
2162	static const struct file_operations spufs_tid_fops = {
2163	.open = spufs_tid_open,
2164	.read = seq_read,
2165	.llseek = seq_lseek,
2166	.release = single_release,
2167	};
2168
2169	static const char *ctx_state_names[] = {
2170	"user", "system", "iowait", "loaded"
2171	};
2172
2173	static unsigned long long spufs_acct_time(struct spu_context *ctx,
2174	enum spu_utilization_state state)
2175	{
2176	unsigned long long time = ctx->stats.times[state];
2177
2178	/*
2179	* In general, utilization statistics are updated by the controlling
2180	* thread as the spu context moves through various well defined
2181	* state transitions, but if the context is lazily loaded its
2182	* utilization statistics are not updated as the controlling thread
2183	* is not tightly coupled with the execution of the spu context. We
2184	* calculate and apply the time delta from the last recorded state
2185	* of the spu context.
2186	*/
2187	if (ctx->spu && ctx->stats.util_state == state) {
2188	time += ktime_get_ns() - ctx->stats.tstamp;
2189	}
2190
2191	return time / NSEC_PER_MSEC;
2192	}
2193
2194	static unsigned long long spufs_slb_flts(struct spu_context *ctx)
2195	{
2196	unsigned long long slb_flts = ctx->stats.slb_flt;
2197
2198	if (ctx->state == SPU_STATE_RUNNABLE) {
2199	slb_flts += (ctx->spu->stats.slb_flt -
2200	ctx->stats.slb_flt_base);
2201	}
2202
2203	return slb_flts;
2204	}
2205
2206	static unsigned long long spufs_class2_intrs(struct spu_context *ctx)
2207	{
2208	unsigned long long class2_intrs = ctx->stats.class2_intr;
2209
2210	if (ctx->state == SPU_STATE_RUNNABLE) {
2211	class2_intrs += (ctx->spu->stats.class2_intr -
2212	ctx->stats.class2_intr_base);
2213	}
2214
2215	return class2_intrs;
2216	}
2217
2218
2219	static int spufs_show_stat(struct seq_file *s, void *private)
2220	{
2221	struct spu_context *ctx = s->private;
2222	int ret;
2223
2224	ret = spu_acquire(ctx);
2225	if (ret)
2226	return ret;
2227
2228	seq_printf(m: s, fmt: "%s %llu %llu %llu %llu "
2229	"%llu %llu %llu %llu %llu %llu %llu %llu\n",
2230	ctx_state_names[ctx->stats.util_state],
2231	spufs_acct_time(ctx, state: SPU_UTIL_USER),
2232	spufs_acct_time(ctx, state: SPU_UTIL_SYSTEM),
2233	spufs_acct_time(ctx, state: SPU_UTIL_IOWAIT),
2234	spufs_acct_time(ctx, state: SPU_UTIL_IDLE_LOADED),
2235	ctx->stats.vol_ctx_switch,
2236	ctx->stats.invol_ctx_switch,
2237	spufs_slb_flts(ctx),
2238	ctx->stats.hash_flt,
2239	ctx->stats.min_flt,
2240	ctx->stats.maj_flt,
2241	spufs_class2_intrs(ctx),
2242	ctx->stats.libassist);
2243	spu_release(ctx);
2244	return 0;
2245	}
2246
2247	static int spufs_stat_open(struct inode *inode, struct file *file)
2248	{
2249	return single_open(file, spufs_show_stat, SPUFS_I(inode)->i_ctx);
2250	}
2251
2252	static const struct file_operations spufs_stat_fops = {
2253	.open = spufs_stat_open,
2254	.read = seq_read,
2255	.llseek = seq_lseek,
2256	.release = single_release,
2257	};
2258
2259	static inline int spufs_switch_log_used(struct spu_context *ctx)
2260	{
2261	return (ctx->switch_log->head - ctx->switch_log->tail) %
2262	SWITCH_LOG_BUFSIZE;
2263	}
2264
2265	static inline int spufs_switch_log_avail(struct spu_context *ctx)
2266	{
2267	return SWITCH_LOG_BUFSIZE - spufs_switch_log_used(ctx);
2268	}
2269
2270	static int spufs_switch_log_open(struct inode *inode, struct file *file)
2271	{
2272	struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2273	int rc;
2274
2275	rc = spu_acquire(ctx);
2276	if (rc)
2277	return rc;
2278
2279	if (ctx->switch_log) {
2280	rc = -EBUSY;
2281	goto out;
2282	}
2283
2284	ctx->switch_log = kmalloc(struct_size(ctx->switch_log, log,
2285	SWITCH_LOG_BUFSIZE), GFP_KERNEL);
2286
2287	if (!ctx->switch_log) {
2288	rc = -ENOMEM;
2289	goto out;
2290	}
2291
2292	ctx->switch_log->head = ctx->switch_log->tail = 0;
2293	init_waitqueue_head(&ctx->switch_log->wait);
2294	rc = 0;
2295
2296	out:
2297	spu_release(ctx);
2298	return rc;
2299	}
2300
2301	static int spufs_switch_log_release(struct inode *inode, struct file *file)
2302	{
2303	struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2304	int rc;
2305
2306	rc = spu_acquire(ctx);
2307	if (rc)
2308	return rc;
2309
2310	kfree(objp: ctx->switch_log);
2311	ctx->switch_log = NULL;
2312	spu_release(ctx);
2313
2314	return 0;
2315	}
2316
2317	static int switch_log_sprint(struct spu_context *ctx, char *tbuf, int n)
2318	{
2319	struct switch_log_entry *p;
2320
2321	p = ctx->switch_log->log + ctx->switch_log->tail % SWITCH_LOG_BUFSIZE;
2322
2323	return snprintf(buf: tbuf, size: n, fmt: "%llu.%09u %d %u %u %llu\n",
2324	(unsigned long long) p->tstamp.tv_sec,
2325	(unsigned int) p->tstamp.tv_nsec,
2326	p->spu_id,
2327	(unsigned int) p->type,
2328	(unsigned int) p->val,
2329	(unsigned long long) p->timebase);
2330	}
2331
2332	static ssize_t spufs_switch_log_read(struct file *file, char __user *buf,
2333	size_t len, loff_t *ppos)
2334	{
2335	struct inode *inode = file_inode(f: file);
2336	struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2337	int error = 0, cnt = 0;
2338
2339	if (!buf)
2340	return -EINVAL;
2341
2342	error = spu_acquire(ctx);
2343	if (error)
2344	return error;
2345
2346	while (cnt < len) {
2347	char tbuf[128];
2348	int width;
2349
2350	if (spufs_switch_log_used(ctx) == 0) {
2351	if (cnt > 0) {
2352	/* If there's data ready to go, we can
2353	* just return straight away */
2354	break;
2355
2356	} else if (file->f_flags & O_NONBLOCK) {
2357	error = -EAGAIN;
2358	break;
2359
2360	} else {
2361	/* spufs_wait will drop the mutex and
2362	* re-acquire, but since we're in read(), the
2363	* file cannot be _released (and so
2364	* ctx->switch_log is stable).
2365	*/
2366	error = spufs_wait(ctx->switch_log->wait,
2367	spufs_switch_log_used(ctx) > 0);
2368
2369	/* On error, spufs_wait returns without the
2370	* state mutex held */
2371	if (error)
2372	return error;
2373
2374	/* We may have had entries read from underneath
2375	* us while we dropped the mutex in spufs_wait,
2376	* so re-check */
2377	if (spufs_switch_log_used(ctx) == 0)
2378	continue;
2379	}
2380	}
2381
2382	width = switch_log_sprint(ctx, tbuf, n: sizeof(tbuf));
2383	if (width < len)
2384	ctx->switch_log->tail =
2385	(ctx->switch_log->tail + 1) %
2386	SWITCH_LOG_BUFSIZE;
2387	else
2388	/* If the record is greater than space available return
2389	* partial buffer (so far) */
2390	break;
2391
2392	error = copy_to_user(to: buf + cnt, from: tbuf, n: width);
2393	if (error)
2394	break;
2395	cnt += width;
2396	}
2397
2398	spu_release(ctx);
2399
2400	return cnt == 0 ? error : cnt;
2401	}
2402
2403	static __poll_t spufs_switch_log_poll(struct file *file, poll_table *wait)
2404	{
2405	struct inode *inode = file_inode(f: file);
2406	struct spu_context *ctx = SPUFS_I(inode)->i_ctx;
2407	__poll_t mask = 0;
2408	int rc;
2409
2410	poll_wait(filp: file, wait_address: &ctx->switch_log->wait, p: wait);
2411
2412	rc = spu_acquire(ctx);
2413	if (rc)
2414	return rc;
2415
2416	if (spufs_switch_log_used(ctx) > 0)
2417	mask |= EPOLLIN;
2418
2419	spu_release(ctx);
2420
2421	return mask;
2422	}
2423
2424	static const struct file_operations spufs_switch_log_fops = {
2425	.open = spufs_switch_log_open,
2426	.read = spufs_switch_log_read,
2427	.poll = spufs_switch_log_poll,
2428	.release = spufs_switch_log_release,
2429	};
2430
2431	/**
2432	* Log a context switch event to a switch log reader.
2433	*
2434	* Must be called with ctx->state_mutex held.
2435	*/
2436	void spu_switch_log_notify(struct spu *spu, struct spu_context *ctx,
2437	u32 type, u32 val)
2438	{
2439	if (!ctx->switch_log)
2440	return;
2441
2442	if (spufs_switch_log_avail(ctx) > 1) {
2443	struct switch_log_entry *p;
2444
2445	p = ctx->switch_log->log + ctx->switch_log->head;
2446	ktime_get_ts64(ts: &p->tstamp);
2447	p->timebase = get_tb();
2448	p->spu_id = spu ? spu->number : -1;
2449	p->type = type;
2450	p->val = val;
2451
2452	ctx->switch_log->head =
2453	(ctx->switch_log->head + 1) % SWITCH_LOG_BUFSIZE;
2454	}
2455
2456	wake_up(&ctx->switch_log->wait);
2457	}
2458
2459	static int spufs_show_ctx(struct seq_file *s, void *private)
2460	{
2461	struct spu_context *ctx = s->private;
2462	u64 mfc_control_RW;
2463
2464	mutex_lock(&ctx->state_mutex);
2465	if (ctx->spu) {
2466	struct spu *spu = ctx->spu;
2467	struct spu_priv2 __iomem *priv2 = spu->priv2;
2468
2469	spin_lock_irq(lock: &spu->register_lock);
2470	mfc_control_RW = in_be64(&priv2->mfc_control_RW);
2471	spin_unlock_irq(lock: &spu->register_lock);
2472	} else {
2473	struct spu_state *csa = &ctx->csa;
2474
2475	mfc_control_RW = csa->priv2.mfc_control_RW;
2476	}
2477
2478	seq_printf(m: s, fmt: "%c flgs(%lx) sflgs(%lx) pri(%d) ts(%d) spu(%02d)"
2479	" %c %llx %llx %llx %llx %x %x\n",
2480	ctx->state == SPU_STATE_SAVED ? 'S' : 'R',
2481	ctx->flags,
2482	ctx->sched_flags,
2483	ctx->prio,
2484	ctx->time_slice,
2485	ctx->spu ? ctx->spu->number : -1,
2486	!list_empty(head: &ctx->rq) ? 'q' : ' ',
2487	ctx->csa.class_0_pending,
2488	ctx->csa.class_0_dar,
2489	ctx->csa.class_1_dsisr,
2490	mfc_control_RW,
2491	ctx->ops->runcntl_read(ctx),
2492	ctx->ops->status_read(ctx));
2493
2494	mutex_unlock(lock: &ctx->state_mutex);
2495
2496	return 0;
2497	}
2498
2499	static int spufs_ctx_open(struct inode *inode, struct file *file)
2500	{
2501	return single_open(file, spufs_show_ctx, SPUFS_I(inode)->i_ctx);
2502	}
2503
2504	static const struct file_operations spufs_ctx_fops = {
2505	.open = spufs_ctx_open,
2506	.read = seq_read,
2507	.llseek = seq_lseek,
2508	.release = single_release,
2509	};
2510
2511	const struct spufs_tree_descr spufs_dir_contents[] = {
2512	{ "capabilities", &spufs_caps_fops, 0444, },
2513	{ "mem", &spufs_mem_fops, 0666, LS_SIZE, },
2514	{ "regs", &spufs_regs_fops, 0666, sizeof(struct spu_reg128[128]), },
2515	{ "mbox", &spufs_mbox_fops, 0444, },
2516	{ "ibox", &spufs_ibox_fops, 0444, },
2517	{ "wbox", &spufs_wbox_fops, 0222, },
2518	{ "mbox_stat", &spufs_mbox_stat_fops, 0444, sizeof(u32), },
2519	{ "ibox_stat", &spufs_ibox_stat_fops, 0444, sizeof(u32), },
2520	{ "wbox_stat", &spufs_wbox_stat_fops, 0444, sizeof(u32), },
2521	{ "signal1", &spufs_signal1_fops, 0666, },
2522	{ "signal2", &spufs_signal2_fops, 0666, },
2523	{ "signal1_type", &spufs_signal1_type, 0666, },
2524	{ "signal2_type", &spufs_signal2_type, 0666, },
2525	{ "cntl", &spufs_cntl_fops, 0666, },
2526	{ "fpcr", &spufs_fpcr_fops, 0666, sizeof(struct spu_reg128), },
2527	{ "lslr", &spufs_lslr_ops, 0444, },
2528	{ "mfc", &spufs_mfc_fops, 0666, },
2529	{ "mss", &spufs_mss_fops, 0666, },
2530	{ "npc", &spufs_npc_ops, 0666, },
2531	{ "srr0", &spufs_srr0_ops, 0666, },
2532	{ "decr", &spufs_decr_ops, 0666, },
2533	{ "decr_status", &spufs_decr_status_ops, 0666, },
2534	{ "event_mask", &spufs_event_mask_ops, 0666, },
2535	{ "event_status", &spufs_event_status_ops, 0444, },
2536	{ "psmap", &spufs_psmap_fops, 0666, SPUFS_PS_MAP_SIZE, },
2537	{ "phys-id", &spufs_id_ops, 0666, },
2538	{ "object-id", &spufs_object_id_ops, 0666, },
2539	{ "mbox_info", &spufs_mbox_info_fops, 0444, sizeof(u32), },
2540	{ "ibox_info", &spufs_ibox_info_fops, 0444, sizeof(u32), },
2541	{ "wbox_info", &spufs_wbox_info_fops, 0444, sizeof(u32), },
2542	{ "dma_info", &spufs_dma_info_fops, 0444,
2543	sizeof(struct spu_dma_info), },
2544	{ "proxydma_info", &spufs_proxydma_info_fops, 0444,
2545	sizeof(struct spu_proxydma_info)},
2546	{ "tid", &spufs_tid_fops, 0444, },
2547	{ "stat", &spufs_stat_fops, 0444, },
2548	{ "switch_log", &spufs_switch_log_fops, 0444 },
2549	{},
2550	};
2551
2552	const struct spufs_tree_descr spufs_dir_nosched_contents[] = {
2553	{ "capabilities", &spufs_caps_fops, 0444, },
2554	{ "mem", &spufs_mem_fops, 0666, LS_SIZE, },
2555	{ "mbox", &spufs_mbox_fops, 0444, },
2556	{ "ibox", &spufs_ibox_fops, 0444, },
2557	{ "wbox", &spufs_wbox_fops, 0222, },
2558	{ "mbox_stat", &spufs_mbox_stat_fops, 0444, sizeof(u32), },
2559	{ "ibox_stat", &spufs_ibox_stat_fops, 0444, sizeof(u32), },
2560	{ "wbox_stat", &spufs_wbox_stat_fops, 0444, sizeof(u32), },
2561	{ "signal1", &spufs_signal1_nosched_fops, 0222, },
2562	{ "signal2", &spufs_signal2_nosched_fops, 0222, },
2563	{ "signal1_type", &spufs_signal1_type, 0666, },
2564	{ "signal2_type", &spufs_signal2_type, 0666, },
2565	{ "mss", &spufs_mss_fops, 0666, },
2566	{ "mfc", &spufs_mfc_fops, 0666, },
2567	{ "cntl", &spufs_cntl_fops, 0666, },
2568	{ "npc", &spufs_npc_ops, 0666, },
2569	{ "psmap", &spufs_psmap_fops, 0666, SPUFS_PS_MAP_SIZE, },
2570	{ "phys-id", &spufs_id_ops, 0666, },
2571	{ "object-id", &spufs_object_id_ops, 0666, },
2572	{ "tid", &spufs_tid_fops, 0444, },
2573	{ "stat", &spufs_stat_fops, 0444, },
2574	{},
2575	};
2576
2577	const struct spufs_tree_descr spufs_dir_debug_contents[] = {
2578	{ ".ctx", &spufs_ctx_fops, 0444, },
2579	{},
2580	};
2581
2582	const struct spufs_coredump_reader spufs_coredump_read[] = {
2583	{ "regs", spufs_regs_dump, NULL, sizeof(struct spu_reg128[128])},
2584	{ "fpcr", spufs_fpcr_dump, NULL, sizeof(struct spu_reg128) },
2585	{ "lslr", NULL, spufs_lslr_get, 19 },
2586	{ "decr", NULL, spufs_decr_get, 19 },
2587	{ "decr_status", NULL, spufs_decr_status_get, 19 },
2588	{ "mem", spufs_mem_dump, NULL, LS_SIZE, },
2589	{ "signal1", spufs_signal1_dump, NULL, sizeof(u32) },
2590	{ "signal1_type", NULL, spufs_signal1_type_get, 19 },
2591	{ "signal2", spufs_signal2_dump, NULL, sizeof(u32) },
2592	{ "signal2_type", NULL, spufs_signal2_type_get, 19 },
2593	{ "event_mask", NULL, spufs_event_mask_get, 19 },
2594	{ "event_status", NULL, spufs_event_status_get, 19 },
2595	{ "mbox_info", spufs_mbox_info_dump, NULL, sizeof(u32) },
2596	{ "ibox_info", spufs_ibox_info_dump, NULL, sizeof(u32) },
2597	{ "wbox_info", spufs_wbox_info_dump, NULL, 4 * sizeof(u32)},
2598	{ "dma_info", spufs_dma_info_dump, NULL, sizeof(struct spu_dma_info)},
2599	{ "proxydma_info", spufs_proxydma_info_dump,
2600	NULL, sizeof(struct spu_proxydma_info)},
2601	{ "object-id", NULL, spufs_object_id_get, 19 },
2602	{ "npc", NULL, spufs_npc_get, 19 },
2603	{ NULL },
2604	};
2605