xref: /openbmc/linux/sound/core/pcm_compat.c (revision 358040e3)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *   32bit -> 64bit ioctl wrapper for PCM API
4  *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
5  */
6 
7 /* This file included from pcm_native.c */
8 
9 #include <linux/compat.h>
10 #include <linux/slab.h>
11 
snd_pcm_ioctl_delay_compat(struct snd_pcm_substream * substream,s32 __user * src)12 static int snd_pcm_ioctl_delay_compat(struct snd_pcm_substream *substream,
13 				      s32 __user *src)
14 {
15 	snd_pcm_sframes_t delay;
16 	int err;
17 
18 	err = snd_pcm_delay(substream, &delay);
19 	if (err)
20 		return err;
21 	if (put_user(delay, src))
22 		return -EFAULT;
23 	return 0;
24 }
25 
snd_pcm_ioctl_rewind_compat(struct snd_pcm_substream * substream,u32 __user * src)26 static int snd_pcm_ioctl_rewind_compat(struct snd_pcm_substream *substream,
27 				       u32 __user *src)
28 {
29 	snd_pcm_uframes_t frames;
30 	int err;
31 
32 	if (get_user(frames, src))
33 		return -EFAULT;
34 	err = snd_pcm_rewind(substream, frames);
35 	if (put_user(err, src))
36 		return -EFAULT;
37 	return err < 0 ? err : 0;
38 }
39 
snd_pcm_ioctl_forward_compat(struct snd_pcm_substream * substream,u32 __user * src)40 static int snd_pcm_ioctl_forward_compat(struct snd_pcm_substream *substream,
41 				       u32 __user *src)
42 {
43 	snd_pcm_uframes_t frames;
44 	int err;
45 
46 	if (get_user(frames, src))
47 		return -EFAULT;
48 	err = snd_pcm_forward(substream, frames);
49 	if (put_user(err, src))
50 		return -EFAULT;
51 	return err < 0 ? err : 0;
52 }
53 
54 struct snd_pcm_hw_params32 {
55 	u32 flags;
56 	struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; /* this must be identical */
57 	struct snd_mask mres[5];	/* reserved masks */
58 	struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
59 	struct snd_interval ires[9];	/* reserved intervals */
60 	u32 rmask;
61 	u32 cmask;
62 	u32 info;
63 	u32 msbits;
64 	u32 rate_num;
65 	u32 rate_den;
66 	u32 fifo_size;
67 	unsigned char reserved[64];
68 };
69 
70 struct snd_pcm_sw_params32 {
71 	s32 tstamp_mode;
72 	u32 period_step;
73 	u32 sleep_min;
74 	u32 avail_min;
75 	u32 xfer_align;
76 	u32 start_threshold;
77 	u32 stop_threshold;
78 	u32 silence_threshold;
79 	u32 silence_size;
80 	u32 boundary;
81 	u32 proto;
82 	u32 tstamp_type;
83 	unsigned char reserved[56];
84 };
85 
snd_pcm_ioctl_sw_params_compat(struct snd_pcm_substream * substream,struct snd_pcm_sw_params32 __user * src)86 static int snd_pcm_ioctl_sw_params_compat(struct snd_pcm_substream *substream,
87 					  struct snd_pcm_sw_params32 __user *src)
88 {
89 	struct snd_pcm_sw_params params;
90 	snd_pcm_uframes_t boundary;
91 	int err;
92 
93 	memset(&params, 0, sizeof(params));
94 	if (get_user(params.tstamp_mode, &src->tstamp_mode) ||
95 	    get_user(params.period_step, &src->period_step) ||
96 	    get_user(params.sleep_min, &src->sleep_min) ||
97 	    get_user(params.avail_min, &src->avail_min) ||
98 	    get_user(params.xfer_align, &src->xfer_align) ||
99 	    get_user(params.start_threshold, &src->start_threshold) ||
100 	    get_user(params.stop_threshold, &src->stop_threshold) ||
101 	    get_user(params.silence_threshold, &src->silence_threshold) ||
102 	    get_user(params.silence_size, &src->silence_size) ||
103 	    get_user(params.tstamp_type, &src->tstamp_type) ||
104 	    get_user(params.proto, &src->proto))
105 		return -EFAULT;
106 	/*
107 	 * Check silent_size parameter.  Since we have 64bit boundary,
108 	 * silence_size must be compared with the 32bit boundary.
109 	 */
110 	boundary = recalculate_boundary(substream->runtime);
111 	if (boundary && params.silence_size >= boundary)
112 		params.silence_size = substream->runtime->boundary;
113 	err = snd_pcm_sw_params(substream, &params);
114 	if (err < 0)
115 		return err;
116 	if (boundary && put_user(boundary, &src->boundary))
117 		return -EFAULT;
118 	return err;
119 }
120 
121 struct snd_pcm_channel_info32 {
122 	u32 channel;
123 	u32 offset;
124 	u32 first;
125 	u32 step;
126 };
127 
snd_pcm_ioctl_channel_info_compat(struct snd_pcm_substream * substream,struct snd_pcm_channel_info32 __user * src)128 static int snd_pcm_ioctl_channel_info_compat(struct snd_pcm_substream *substream,
129 					     struct snd_pcm_channel_info32 __user *src)
130 {
131 	struct snd_pcm_channel_info info;
132 	int err;
133 
134 	if (get_user(info.channel, &src->channel) ||
135 	    get_user(info.offset, &src->offset) ||
136 	    get_user(info.first, &src->first) ||
137 	    get_user(info.step, &src->step))
138 		return -EFAULT;
139 	err = snd_pcm_channel_info(substream, &info);
140 	if (err < 0)
141 		return err;
142 	if (put_user(info.channel, &src->channel) ||
143 	    put_user(info.offset, &src->offset) ||
144 	    put_user(info.first, &src->first) ||
145 	    put_user(info.step, &src->step))
146 		return -EFAULT;
147 	return err;
148 }
149 
150 #ifdef CONFIG_X86_X32_ABI
151 /* X32 ABI has the same struct as x86-64 for snd_pcm_channel_info */
152 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
153 				     struct snd_pcm_channel_info __user *src);
154 #define snd_pcm_ioctl_channel_info_x32(s, p)	\
155 	snd_pcm_channel_info_user(s, p)
156 #endif /* CONFIG_X86_X32_ABI */
157 
158 struct compat_snd_pcm_status64 {
159 	snd_pcm_state_t state;
160 	u8 rsvd[4]; /* alignment */
161 	s64 trigger_tstamp_sec;
162 	s64 trigger_tstamp_nsec;
163 	s64 tstamp_sec;
164 	s64 tstamp_nsec;
165 	u32 appl_ptr;
166 	u32 hw_ptr;
167 	s32 delay;
168 	u32 avail;
169 	u32 avail_max;
170 	u32 overrange;
171 	snd_pcm_state_t suspended_state;
172 	u32 audio_tstamp_data;
173 	s64 audio_tstamp_sec;
174 	s64 audio_tstamp_nsec;
175 	s64 driver_tstamp_sec;
176 	s64 driver_tstamp_nsec;
177 	u32 audio_tstamp_accuracy;
178 	unsigned char reserved[52-4*sizeof(s64)];
179 } __packed;
180 
snd_pcm_status_user_compat64(struct snd_pcm_substream * substream,struct compat_snd_pcm_status64 __user * src,bool ext)181 static int snd_pcm_status_user_compat64(struct snd_pcm_substream *substream,
182 					struct compat_snd_pcm_status64 __user *src,
183 					bool ext)
184 {
185 	struct snd_pcm_status64 status;
186 	struct compat_snd_pcm_status64 compat_status64;
187 	int err;
188 
189 	memset(&status, 0, sizeof(status));
190 	memset(&compat_status64, 0, sizeof(compat_status64));
191 	/*
192 	 * with extension, parameters are read/write,
193 	 * get audio_tstamp_data from user,
194 	 * ignore rest of status structure
195 	 */
196 	if (ext && get_user(status.audio_tstamp_data,
197 				(u32 __user *)(&src->audio_tstamp_data)))
198 		return -EFAULT;
199 	err = snd_pcm_status64(substream, &status);
200 	if (err < 0)
201 		return err;
202 
203 	if (clear_user(src, sizeof(*src)))
204 		return -EFAULT;
205 
206 	compat_status64 = (struct compat_snd_pcm_status64) {
207 		.state = status.state,
208 		.trigger_tstamp_sec = status.trigger_tstamp_sec,
209 		.trigger_tstamp_nsec = status.trigger_tstamp_nsec,
210 		.tstamp_sec = status.tstamp_sec,
211 		.tstamp_nsec = status.tstamp_nsec,
212 		.appl_ptr = status.appl_ptr,
213 		.hw_ptr = status.hw_ptr,
214 		.delay = status.delay,
215 		.avail = status.avail,
216 		.avail_max = status.avail_max,
217 		.overrange = status.overrange,
218 		.suspended_state = status.suspended_state,
219 		.audio_tstamp_data = status.audio_tstamp_data,
220 		.audio_tstamp_sec = status.audio_tstamp_sec,
221 		.audio_tstamp_nsec = status.audio_tstamp_nsec,
222 		.driver_tstamp_sec = status.audio_tstamp_sec,
223 		.driver_tstamp_nsec = status.audio_tstamp_nsec,
224 		.audio_tstamp_accuracy = status.audio_tstamp_accuracy,
225 	};
226 
227 	if (copy_to_user(src, &compat_status64, sizeof(compat_status64)))
228 		return -EFAULT;
229 
230 	return err;
231 }
232 
233 /* both for HW_PARAMS and HW_REFINE */
snd_pcm_ioctl_hw_params_compat(struct snd_pcm_substream * substream,int refine,struct snd_pcm_hw_params32 __user * data32)234 static int snd_pcm_ioctl_hw_params_compat(struct snd_pcm_substream *substream,
235 					  int refine,
236 					  struct snd_pcm_hw_params32 __user *data32)
237 {
238 	struct snd_pcm_hw_params *data;
239 	struct snd_pcm_runtime *runtime;
240 	int err;
241 
242 	runtime = substream->runtime;
243 	if (!runtime)
244 		return -ENOTTY;
245 
246 	data = kmalloc(sizeof(*data), GFP_KERNEL);
247 	if (!data)
248 		return -ENOMEM;
249 
250 	/* only fifo_size (RO from userspace) is different, so just copy all */
251 	if (copy_from_user(data, data32, sizeof(*data32))) {
252 		err = -EFAULT;
253 		goto error;
254 	}
255 
256 	if (refine) {
257 		err = snd_pcm_hw_refine(substream, data);
258 		if (err < 0)
259 			goto error;
260 		err = fixup_unreferenced_params(substream, data);
261 	} else {
262 		err = snd_pcm_hw_params(substream, data);
263 	}
264 	if (err < 0)
265 		goto error;
266 	if (copy_to_user(data32, data, sizeof(*data32)) ||
267 	    put_user(data->fifo_size, &data32->fifo_size)) {
268 		err = -EFAULT;
269 		goto error;
270 	}
271 
272 	if (! refine) {
273 		unsigned int new_boundary = recalculate_boundary(runtime);
274 		if (new_boundary)
275 			runtime->boundary = new_boundary;
276 	}
277  error:
278 	kfree(data);
279 	return err;
280 }
281 
282 
283 /*
284  */
285 struct snd_xferi32 {
286 	s32 result;
287 	u32 buf;
288 	u32 frames;
289 };
290 
snd_pcm_ioctl_xferi_compat(struct snd_pcm_substream * substream,int dir,struct snd_xferi32 __user * data32)291 static int snd_pcm_ioctl_xferi_compat(struct snd_pcm_substream *substream,
292 				      int dir, struct snd_xferi32 __user *data32)
293 {
294 	compat_caddr_t buf;
295 	u32 frames;
296 	int err;
297 
298 	if (! substream->runtime)
299 		return -ENOTTY;
300 	if (substream->stream != dir)
301 		return -EINVAL;
302 	if (substream->runtime->state == SNDRV_PCM_STATE_OPEN)
303 		return -EBADFD;
304 
305 	if (get_user(buf, &data32->buf) ||
306 	    get_user(frames, &data32->frames))
307 		return -EFAULT;
308 
309 	if (dir == SNDRV_PCM_STREAM_PLAYBACK)
310 		err = snd_pcm_lib_write(substream, compat_ptr(buf), frames);
311 	else
312 		err = snd_pcm_lib_read(substream, compat_ptr(buf), frames);
313 	if (err < 0)
314 		return err;
315 	/* copy the result */
316 	if (put_user(err, &data32->result))
317 		return -EFAULT;
318 	return 0;
319 }
320 
321 
322 /* snd_xfern needs remapping of bufs */
323 struct snd_xfern32 {
324 	s32 result;
325 	u32 bufs;  /* this is void **; */
326 	u32 frames;
327 };
328 
329 /*
330  * xfern ioctl nees to copy (up to) 128 pointers on stack.
331  * although we may pass the copied pointers through f_op->ioctl, but the ioctl
332  * handler there expands again the same 128 pointers on stack, so it is better
333  * to handle the function (calling pcm_readv/writev) directly in this handler.
334  */
snd_pcm_ioctl_xfern_compat(struct snd_pcm_substream * substream,int dir,struct snd_xfern32 __user * data32)335 static int snd_pcm_ioctl_xfern_compat(struct snd_pcm_substream *substream,
336 				      int dir, struct snd_xfern32 __user *data32)
337 {
338 	compat_caddr_t buf;
339 	compat_caddr_t __user *bufptr;
340 	u32 frames;
341 	void __user **bufs;
342 	int err, ch, i;
343 
344 	if (! substream->runtime)
345 		return -ENOTTY;
346 	if (substream->stream != dir)
347 		return -EINVAL;
348 	if (substream->runtime->state == SNDRV_PCM_STATE_OPEN)
349 		return -EBADFD;
350 
351 	ch = substream->runtime->channels;
352 	if (ch > 128)
353 		return -EINVAL;
354 	if (get_user(buf, &data32->bufs) ||
355 	    get_user(frames, &data32->frames))
356 		return -EFAULT;
357 	bufptr = compat_ptr(buf);
358 	bufs = kmalloc_array(ch, sizeof(void __user *), GFP_KERNEL);
359 	if (bufs == NULL)
360 		return -ENOMEM;
361 	for (i = 0; i < ch; i++) {
362 		u32 ptr;
363 		if (get_user(ptr, bufptr)) {
364 			kfree(bufs);
365 			return -EFAULT;
366 		}
367 		bufs[i] = compat_ptr(ptr);
368 		bufptr++;
369 	}
370 	if (dir == SNDRV_PCM_STREAM_PLAYBACK)
371 		err = snd_pcm_lib_writev(substream, bufs, frames);
372 	else
373 		err = snd_pcm_lib_readv(substream, bufs, frames);
374 	if (err >= 0) {
375 		if (put_user(err, &data32->result))
376 			err = -EFAULT;
377 	}
378 	kfree(bufs);
379 	return err;
380 }
381 
382 #ifdef CONFIG_X86_X32_ABI
383 /* X32 ABI has 64bit timespec and 64bit alignment */
384 struct snd_pcm_mmap_status_x32 {
385 	snd_pcm_state_t state;
386 	s32 pad1;
387 	u32 hw_ptr;
388 	u32 pad2; /* alignment */
389 	s64 tstamp_sec;
390 	s64 tstamp_nsec;
391 	snd_pcm_state_t suspended_state;
392 	s32 pad3;
393 	s64 audio_tstamp_sec;
394 	s64 audio_tstamp_nsec;
395 } __packed;
396 
397 struct snd_pcm_mmap_control_x32 {
398 	u32 appl_ptr;
399 	u32 avail_min;
400 };
401 
402 struct snd_pcm_sync_ptr_x32 {
403 	u32 flags;
404 	u32 rsvd; /* alignment */
405 	union {
406 		struct snd_pcm_mmap_status_x32 status;
407 		unsigned char reserved[64];
408 	} s;
409 	union {
410 		struct snd_pcm_mmap_control_x32 control;
411 		unsigned char reserved[64];
412 	} c;
413 } __packed;
414 
snd_pcm_ioctl_sync_ptr_x32(struct snd_pcm_substream * substream,struct snd_pcm_sync_ptr_x32 __user * src)415 static int snd_pcm_ioctl_sync_ptr_x32(struct snd_pcm_substream *substream,
416 				      struct snd_pcm_sync_ptr_x32 __user *src)
417 {
418 	struct snd_pcm_runtime *runtime = substream->runtime;
419 	volatile struct snd_pcm_mmap_status *status;
420 	volatile struct snd_pcm_mmap_control *control;
421 	u32 sflags;
422 	struct snd_pcm_mmap_control scontrol;
423 	struct snd_pcm_mmap_status sstatus;
424 	snd_pcm_uframes_t boundary;
425 	int err;
426 
427 	if (snd_BUG_ON(!runtime))
428 		return -EINVAL;
429 
430 	if (get_user(sflags, &src->flags) ||
431 	    get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
432 	    get_user(scontrol.avail_min, &src->c.control.avail_min))
433 		return -EFAULT;
434 	if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
435 		err = snd_pcm_hwsync(substream);
436 		if (err < 0)
437 			return err;
438 	}
439 	status = runtime->status;
440 	control = runtime->control;
441 	boundary = recalculate_boundary(runtime);
442 	if (!boundary)
443 		boundary = 0x7fffffff;
444 	snd_pcm_stream_lock_irq(substream);
445 	/* FIXME: we should consider the boundary for the sync from app */
446 	if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
447 		control->appl_ptr = scontrol.appl_ptr;
448 	else
449 		scontrol.appl_ptr = control->appl_ptr % boundary;
450 	if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
451 		control->avail_min = scontrol.avail_min;
452 	else
453 		scontrol.avail_min = control->avail_min;
454 	sstatus.state = status->state;
455 	sstatus.hw_ptr = status->hw_ptr % boundary;
456 	sstatus.tstamp = status->tstamp;
457 	sstatus.suspended_state = status->suspended_state;
458 	sstatus.audio_tstamp = status->audio_tstamp;
459 	snd_pcm_stream_unlock_irq(substream);
460 	if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
461 		snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
462 	if (put_user(sstatus.state, &src->s.status.state) ||
463 	    put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
464 	    put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
465 	    put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
466 	    put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
467 	    put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
468 	    put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
469 	    put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
470 	    put_user(scontrol.avail_min, &src->c.control.avail_min))
471 		return -EFAULT;
472 
473 	return 0;
474 }
475 #endif /* CONFIG_X86_X32_ABI */
476 
477 #ifdef __BIG_ENDIAN
478 typedef char __pad_before_u32[4];
479 typedef char __pad_after_u32[0];
480 #else
481 typedef char __pad_before_u32[0];
482 typedef char __pad_after_u32[4];
483 #endif
484 
485 /* PCM 2.0.15 API definition had a bug in mmap control; it puts the avail_min
486  * at the wrong offset due to a typo in padding type.
487  * The bug hits only 32bit.
488  * A workaround for incorrect read/write is needed only in 32bit compat mode.
489  */
490 struct __snd_pcm_mmap_control64_buggy {
491 	__pad_before_u32 __pad1;
492 	__u32 appl_ptr;
493 	__pad_before_u32 __pad2;	/* SiC! here is the bug */
494 	__pad_before_u32 __pad3;
495 	__u32 avail_min;
496 	__pad_after_uframe __pad4;
497 };
498 
snd_pcm_ioctl_sync_ptr_buggy(struct snd_pcm_substream * substream,struct snd_pcm_sync_ptr __user * _sync_ptr)499 static int snd_pcm_ioctl_sync_ptr_buggy(struct snd_pcm_substream *substream,
500 					struct snd_pcm_sync_ptr __user *_sync_ptr)
501 {
502 	struct snd_pcm_runtime *runtime = substream->runtime;
503 	struct snd_pcm_sync_ptr sync_ptr;
504 	struct __snd_pcm_mmap_control64_buggy *sync_cp;
505 	volatile struct snd_pcm_mmap_status *status;
506 	volatile struct snd_pcm_mmap_control *control;
507 	int err;
508 
509 	memset(&sync_ptr, 0, sizeof(sync_ptr));
510 	sync_cp = (struct __snd_pcm_mmap_control64_buggy *)&sync_ptr.c.control;
511 	if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
512 		return -EFAULT;
513 	if (copy_from_user(sync_cp, &(_sync_ptr->c.control), sizeof(*sync_cp)))
514 		return -EFAULT;
515 	status = runtime->status;
516 	control = runtime->control;
517 	if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
518 		err = snd_pcm_hwsync(substream);
519 		if (err < 0)
520 			return err;
521 	}
522 	snd_pcm_stream_lock_irq(substream);
523 	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
524 		err = pcm_lib_apply_appl_ptr(substream, sync_cp->appl_ptr);
525 		if (err < 0) {
526 			snd_pcm_stream_unlock_irq(substream);
527 			return err;
528 		}
529 	} else {
530 		sync_cp->appl_ptr = control->appl_ptr;
531 	}
532 	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
533 		control->avail_min = sync_cp->avail_min;
534 	else
535 		sync_cp->avail_min = control->avail_min;
536 	sync_ptr.s.status.state = status->state;
537 	sync_ptr.s.status.hw_ptr = status->hw_ptr;
538 	sync_ptr.s.status.tstamp = status->tstamp;
539 	sync_ptr.s.status.suspended_state = status->suspended_state;
540 	sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
541 	snd_pcm_stream_unlock_irq(substream);
542 	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
543 		snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
544 	if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
545 		return -EFAULT;
546 	return 0;
547 }
548 
549 /*
550  */
551 enum {
552 	SNDRV_PCM_IOCTL_HW_REFINE32 = _IOWR('A', 0x10, struct snd_pcm_hw_params32),
553 	SNDRV_PCM_IOCTL_HW_PARAMS32 = _IOWR('A', 0x11, struct snd_pcm_hw_params32),
554 	SNDRV_PCM_IOCTL_SW_PARAMS32 = _IOWR('A', 0x13, struct snd_pcm_sw_params32),
555 	SNDRV_PCM_IOCTL_STATUS_COMPAT32 = _IOR('A', 0x20, struct snd_pcm_status32),
556 	SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT32 = _IOWR('A', 0x24, struct snd_pcm_status32),
557 	SNDRV_PCM_IOCTL_DELAY32 = _IOR('A', 0x21, s32),
558 	SNDRV_PCM_IOCTL_CHANNEL_INFO32 = _IOR('A', 0x32, struct snd_pcm_channel_info32),
559 	SNDRV_PCM_IOCTL_REWIND32 = _IOW('A', 0x46, u32),
560 	SNDRV_PCM_IOCTL_FORWARD32 = _IOW('A', 0x49, u32),
561 	SNDRV_PCM_IOCTL_WRITEI_FRAMES32 = _IOW('A', 0x50, struct snd_xferi32),
562 	SNDRV_PCM_IOCTL_READI_FRAMES32 = _IOR('A', 0x51, struct snd_xferi32),
563 	SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct snd_xfern32),
564 	SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32),
565 	SNDRV_PCM_IOCTL_STATUS_COMPAT64 = _IOR('A', 0x20, struct compat_snd_pcm_status64),
566 	SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT64 = _IOWR('A', 0x24, struct compat_snd_pcm_status64),
567 #ifdef CONFIG_X86_X32_ABI
568 	SNDRV_PCM_IOCTL_CHANNEL_INFO_X32 = _IOR('A', 0x32, struct snd_pcm_channel_info),
569 	SNDRV_PCM_IOCTL_SYNC_PTR_X32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr_x32),
570 #endif /* CONFIG_X86_X32_ABI */
571 };
572 
snd_pcm_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)573 static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
574 {
575 	struct snd_pcm_file *pcm_file;
576 	struct snd_pcm_substream *substream;
577 	void __user *argp = compat_ptr(arg);
578 
579 	pcm_file = file->private_data;
580 	if (! pcm_file)
581 		return -ENOTTY;
582 	substream = pcm_file->substream;
583 	if (! substream)
584 		return -ENOTTY;
585 
586 	/*
587 	 * When PCM is used on 32bit mode, we need to disable
588 	 * mmap of the old PCM status/control records because
589 	 * of the size incompatibility.
590 	 */
591 	pcm_file->no_compat_mmap = 1;
592 
593 	switch (cmd) {
594 	case SNDRV_PCM_IOCTL_PVERSION:
595 	case SNDRV_PCM_IOCTL_INFO:
596 	case SNDRV_PCM_IOCTL_TSTAMP:
597 	case SNDRV_PCM_IOCTL_TTSTAMP:
598 	case SNDRV_PCM_IOCTL_USER_PVERSION:
599 	case SNDRV_PCM_IOCTL_HWSYNC:
600 	case SNDRV_PCM_IOCTL_PREPARE:
601 	case SNDRV_PCM_IOCTL_RESET:
602 	case SNDRV_PCM_IOCTL_START:
603 	case SNDRV_PCM_IOCTL_DROP:
604 	case SNDRV_PCM_IOCTL_DRAIN:
605 	case SNDRV_PCM_IOCTL_PAUSE:
606 	case SNDRV_PCM_IOCTL_HW_FREE:
607 	case SNDRV_PCM_IOCTL_RESUME:
608 	case SNDRV_PCM_IOCTL_XRUN:
609 	case SNDRV_PCM_IOCTL_LINK:
610 	case SNDRV_PCM_IOCTL_UNLINK:
611 	case __SNDRV_PCM_IOCTL_SYNC_PTR32:
612 		return snd_pcm_common_ioctl(file, substream, cmd, argp);
613 	case __SNDRV_PCM_IOCTL_SYNC_PTR64:
614 #ifdef CONFIG_X86_X32_ABI
615 		if (in_x32_syscall())
616 			return snd_pcm_ioctl_sync_ptr_x32(substream, argp);
617 #endif /* CONFIG_X86_X32_ABI */
618 		return snd_pcm_ioctl_sync_ptr_buggy(substream, argp);
619 	case SNDRV_PCM_IOCTL_HW_REFINE32:
620 		return snd_pcm_ioctl_hw_params_compat(substream, 1, argp);
621 	case SNDRV_PCM_IOCTL_HW_PARAMS32:
622 		return snd_pcm_ioctl_hw_params_compat(substream, 0, argp);
623 	case SNDRV_PCM_IOCTL_SW_PARAMS32:
624 		return snd_pcm_ioctl_sw_params_compat(substream, argp);
625 	case SNDRV_PCM_IOCTL_STATUS_COMPAT32:
626 		return snd_pcm_status_user32(substream, argp, false);
627 	case SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT32:
628 		return snd_pcm_status_user32(substream, argp, true);
629 	case SNDRV_PCM_IOCTL_CHANNEL_INFO32:
630 		return snd_pcm_ioctl_channel_info_compat(substream, argp);
631 	case SNDRV_PCM_IOCTL_WRITEI_FRAMES32:
632 		return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
633 	case SNDRV_PCM_IOCTL_READI_FRAMES32:
634 		return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
635 	case SNDRV_PCM_IOCTL_WRITEN_FRAMES32:
636 		return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
637 	case SNDRV_PCM_IOCTL_READN_FRAMES32:
638 		return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
639 	case SNDRV_PCM_IOCTL_DELAY32:
640 		return snd_pcm_ioctl_delay_compat(substream, argp);
641 	case SNDRV_PCM_IOCTL_REWIND32:
642 		return snd_pcm_ioctl_rewind_compat(substream, argp);
643 	case SNDRV_PCM_IOCTL_FORWARD32:
644 		return snd_pcm_ioctl_forward_compat(substream, argp);
645 	case SNDRV_PCM_IOCTL_STATUS_COMPAT64:
646 		return snd_pcm_status_user_compat64(substream, argp, false);
647 	case SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT64:
648 		return snd_pcm_status_user_compat64(substream, argp, true);
649 #ifdef CONFIG_X86_X32_ABI
650 	case SNDRV_PCM_IOCTL_CHANNEL_INFO_X32:
651 		return snd_pcm_ioctl_channel_info_x32(substream, argp);
652 #endif /* CONFIG_X86_X32_ABI */
653 	}
654 
655 	return -ENOIOCTLCMD;
656 }
657