1// SPDX-License-Identifier: GPL-2.0
2/*
3 * The USB Monitor, inspired by Dave Harding's USBMon.
4 *
5 * This is a binary format reader.
6 *
7 * Copyright (C) 2006 Paolo Abeni (paolo.abeni@email.it)
8 * Copyright (C) 2006,2007 Pete Zaitcev (zaitcev@redhat.com)
9 */
10
11#include <linux/kernel.h>
12#include <linux/sched/signal.h>
13#include <linux/types.h>
14#include <linux/fs.h>
15#include <linux/cdev.h>
16#include <linux/export.h>
17#include <linux/usb.h>
18#include <linux/poll.h>
19#include <linux/compat.h>
20#include <linux/mm.h>
21#include <linux/scatterlist.h>
22#include <linux/slab.h>
23#include <linux/time64.h>
24
25#include <linux/uaccess.h>
26
27#include "usb_mon.h"
28
29/*
30 * Defined by USB 2.0 clause 9.3, table 9.2.
31 */
32#define SETUP_LEN 8
33
34/* ioctl macros */
35#define MON_IOC_MAGIC 0x92
36
37#define MON_IOCQ_URB_LEN _IO(MON_IOC_MAGIC, 1)
38/* #2 used to be MON_IOCX_URB, removed before it got into Linus tree */
39#define MON_IOCG_STATS _IOR(MON_IOC_MAGIC, 3, struct mon_bin_stats)
40#define MON_IOCT_RING_SIZE _IO(MON_IOC_MAGIC, 4)
41#define MON_IOCQ_RING_SIZE _IO(MON_IOC_MAGIC, 5)
42#define MON_IOCX_GET _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get)
43#define MON_IOCX_MFETCH _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch)
44#define MON_IOCH_MFLUSH _IO(MON_IOC_MAGIC, 8)
45/* #9 was MON_IOCT_SETAPI */
46#define MON_IOCX_GETX _IOW(MON_IOC_MAGIC, 10, struct mon_bin_get)
47
48#ifdef CONFIG_COMPAT
49#define MON_IOCX_GET32 _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get32)
50#define MON_IOCX_MFETCH32 _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch32)
51#define MON_IOCX_GETX32 _IOW(MON_IOC_MAGIC, 10, struct mon_bin_get32)
52#endif
53
54/*
55 * Some architectures have enormous basic pages (16KB for ia64, 64KB for ppc).
56 * But it's all right. Just use a simple way to make sure the chunk is never
57 * smaller than a page.
58 *
59 * N.B. An application does not know our chunk size.
60 *
61 * Woops, get_zeroed_page() returns a single page. I guess we're stuck with
62 * page-sized chunks for the time being.
63 */
64#define CHUNK_SIZE PAGE_SIZE
65#define CHUNK_ALIGN(x) (((x)+CHUNK_SIZE-1) & ~(CHUNK_SIZE-1))
66
67/*
68 * The magic limit was calculated so that it allows the monitoring
69 * application to pick data once in two ticks. This way, another application,
70 * which presumably drives the bus, gets to hog CPU, yet we collect our data.
71 *
72 * Originally, for a 480 Mbit/s bus this required a buffer of about 1 MB. For
73 * modern 20 Gbps buses, this value increases to over 50 MB. The maximum
74 * buffer size is set to 64 MiB to accommodate this.
75 *
76 * This is still too much for most cases, where we just snoop a few
77 * descriptor fetches for enumeration. So, the default is a "reasonable"
78 * amount for typical, low-throughput use cases.
79 *
80 * XXX What about multi-megabyte URBs which take minutes to transfer?
81 */
82#define BUFF_MAX CHUNK_ALIGN(64*1024*1024)
83#define BUFF_DFL CHUNK_ALIGN(300*1024)
84#define BUFF_MIN CHUNK_ALIGN(8*1024)
85
86/*
87 * The per-event API header (2 per URB).
88 *
89 * This structure is seen in userland as defined by the documentation.
90 */
91struct mon_bin_hdr {
92 u64 id; /* URB ID - from submission to callback */
93 unsigned char type; /* Same as in text API; extensible. */
94 unsigned char xfer_type; /* ISO, Intr, Control, Bulk */
95 unsigned char epnum; /* Endpoint number and transfer direction */
96 unsigned char devnum; /* Device address */
97 unsigned short busnum; /* Bus number */
98 char flag_setup;
99 char flag_data;
100 s64 ts_sec; /* ktime_get_real_ts64 */
101 s32 ts_usec; /* ktime_get_real_ts64 */
102 int status;
103 unsigned int len_urb; /* Length of data (submitted or actual) */
104 unsigned int len_cap; /* Delivered length */
105 union {
106 unsigned char setup[SETUP_LEN]; /* Only for Control S-type */
107 struct iso_rec {
108 int error_count;
109 int numdesc;
110 } iso;
111 } s;
112 int interval;
113 int start_frame;
114 unsigned int xfer_flags;
115 unsigned int ndesc; /* Actual number of ISO descriptors */
116};
117
118/*
119 * ISO vector, packed into the head of data stream.
120 * This has to take 16 bytes to make sure that the end of buffer
121 * wrap is not happening in the middle of a descriptor.
122 */
123struct mon_bin_isodesc {
124 int iso_status;
125 unsigned int iso_off;
126 unsigned int iso_len;
127 u32 _pad;
128};
129
130/* per file statistic */
131struct mon_bin_stats {
132 u32 queued;
133 u32 dropped;
134};
135
136struct mon_bin_get {
137 struct mon_bin_hdr __user *hdr; /* Can be 48 bytes or 64. */
138 void __user *data;
139 size_t alloc; /* Length of data (can be zero) */
140};
141
142struct mon_bin_mfetch {
143 u32 __user *offvec; /* Vector of events fetched */
144 u32 nfetch; /* Number of events to fetch (out: fetched) */
145 u32 nflush; /* Number of events to flush */
146};
147
148#ifdef CONFIG_COMPAT
149struct mon_bin_get32 {
150 u32 hdr32;
151 u32 data32;
152 u32 alloc32;
153};
154
155struct mon_bin_mfetch32 {
156 u32 offvec32;
157 u32 nfetch32;
158 u32 nflush32;
159};
160#endif
161
162/* Having these two values same prevents wrapping of the mon_bin_hdr */
163#define PKT_ALIGN 64
164#define PKT_SIZE 64
165
166#define PKT_SZ_API0 48 /* API 0 (2.6.20) size */
167#define PKT_SZ_API1 64 /* API 1 size: extra fields */
168
169#define ISODESC_MAX 128 /* Same number as usbfs allows, 2048 bytes. */
170
171/* max number of USB bus supported */
172#define MON_BIN_MAX_MINOR 128
173
174/*
175 * The buffer: map of used pages.
176 */
177struct mon_pgmap {
178 struct page *pg;
179 unsigned char *ptr; /* XXX just use page_to_virt everywhere? */
180};
181
182/*
183 * This gets associated with an open file struct.
184 */
185struct mon_reader_bin {
186 /* The buffer: one per open. */
187 spinlock_t b_lock; /* Protect b_cnt, b_in */
188 unsigned int b_size; /* Current size of the buffer - bytes */
189 unsigned int b_cnt; /* Bytes used */
190 unsigned int b_in, b_out; /* Offsets into buffer - bytes */
191 unsigned int b_read; /* Amount of read data in curr. pkt. */
192 struct mon_pgmap *b_vec; /* The map array */
193 wait_queue_head_t b_wait; /* Wait for data here */
194
195 struct mutex fetch_lock; /* Protect b_read, b_out */
196 int mmap_active;
197
198 /* A list of these is needed for "bus 0". Some time later. */
199 struct mon_reader r;
200
201 /* Stats */
202 unsigned int cnt_lost;
203};
204
205static inline struct mon_bin_hdr *MON_OFF2HDR(const struct mon_reader_bin *rp,
206 unsigned int offset)
207{
208 return (struct mon_bin_hdr *)
209 (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE);
210}
211
212#define MON_RING_EMPTY(rp) ((rp)->b_cnt == 0)
213
214static unsigned char xfer_to_pipe[4] = {
215 PIPE_CONTROL, PIPE_ISOCHRONOUS, PIPE_BULK, PIPE_INTERRUPT
216};
217
218static const struct class mon_bin_class = {
219 .name = "usbmon",
220};
221
222static dev_t mon_bin_dev0;
223static struct cdev mon_bin_cdev;
224
225static void mon_buff_area_fill(const struct mon_reader_bin *rp,
226 unsigned int offset, unsigned int size);
227static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp);
228static int mon_alloc_buff(struct mon_pgmap *map, int npages);
229static void mon_free_buff(struct mon_pgmap *map, int npages);
230
231/*
232 * This is a "chunked memcpy". It does not manipulate any counters.
233 */
234static unsigned int mon_copy_to_buff(const struct mon_reader_bin *this,
235 unsigned int off, const unsigned char *from, unsigned int length)
236{
237 unsigned int step_len;
238 unsigned char *buf;
239 unsigned int in_page;
240
241 while (length) {
242 /*
243 * Determine step_len.
244 */
245 step_len = length;
246 in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1));
247 if (in_page < step_len)
248 step_len = in_page;
249
250 /*
251 * Copy data and advance pointers.
252 */
253 buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE;
254 memcpy(to: buf, from, len: step_len);
255 if ((off += step_len) >= this->b_size) off = 0;
256 from += step_len;
257 length -= step_len;
258 }
259 return off;
260}
261
262/*
263 * This is a little worse than the above because it's "chunked copy_to_user".
264 * The return value is an error code, not an offset.
265 */
266static int copy_from_buf(const struct mon_reader_bin *this, unsigned int off,
267 char __user *to, int length)
268{
269 unsigned int step_len;
270 unsigned char *buf;
271 unsigned int in_page;
272
273 while (length) {
274 /*
275 * Determine step_len.
276 */
277 step_len = length;
278 in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1));
279 if (in_page < step_len)
280 step_len = in_page;
281
282 /*
283 * Copy data and advance pointers.
284 */
285 buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE;
286 if (copy_to_user(to, from: buf, n: step_len))
287 return -EINVAL;
288 if ((off += step_len) >= this->b_size) off = 0;
289 to += step_len;
290 length -= step_len;
291 }
292 return 0;
293}
294
295/*
296 * Allocate an (aligned) area in the buffer.
297 * This is called under b_lock.
298 * Returns ~0 on failure.
299 */
300static unsigned int mon_buff_area_alloc(struct mon_reader_bin *rp,
301 unsigned int size)
302{
303 unsigned int offset;
304
305 size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
306 if (rp->b_cnt + size > rp->b_size)
307 return ~0;
308 offset = rp->b_in;
309 rp->b_cnt += size;
310 if ((rp->b_in += size) >= rp->b_size)
311 rp->b_in -= rp->b_size;
312 return offset;
313}
314
315/*
316 * This is the same thing as mon_buff_area_alloc, only it does not allow
317 * buffers to wrap. This is needed by applications which pass references
318 * into mmap-ed buffers up their stacks (libpcap can do that).
319 *
320 * Currently, we always have the header stuck with the data, although
321 * it is not strictly speaking necessary.
322 *
323 * When a buffer would wrap, we place a filler packet to mark the space.
324 */
325static unsigned int mon_buff_area_alloc_contiguous(struct mon_reader_bin *rp,
326 unsigned int size)
327{
328 unsigned int offset;
329 unsigned int fill_size;
330
331 size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
332 if (rp->b_cnt + size > rp->b_size)
333 return ~0;
334 if (rp->b_in + size > rp->b_size) {
335 /*
336 * This would wrap. Find if we still have space after
337 * skipping to the end of the buffer. If we do, place
338 * a filler packet and allocate a new packet.
339 */
340 fill_size = rp->b_size - rp->b_in;
341 if (rp->b_cnt + size + fill_size > rp->b_size)
342 return ~0;
343 mon_buff_area_fill(rp, offset: rp->b_in, size: fill_size);
344
345 offset = 0;
346 rp->b_in = size;
347 rp->b_cnt += size + fill_size;
348 } else if (rp->b_in + size == rp->b_size) {
349 offset = rp->b_in;
350 rp->b_in = 0;
351 rp->b_cnt += size;
352 } else {
353 offset = rp->b_in;
354 rp->b_in += size;
355 rp->b_cnt += size;
356 }
357 return offset;
358}
359
360/*
361 * Return a few (kilo-)bytes to the head of the buffer.
362 * This is used if a data fetch fails.
363 */
364static void mon_buff_area_shrink(struct mon_reader_bin *rp, unsigned int size)
365{
366
367 /* size &= ~(PKT_ALIGN-1); -- we're called with aligned size */
368 rp->b_cnt -= size;
369 if (rp->b_in < size)
370 rp->b_in += rp->b_size;
371 rp->b_in -= size;
372}
373
374/*
375 * This has to be called under both b_lock and fetch_lock, because
376 * it accesses both b_cnt and b_out.
377 */
378static void mon_buff_area_free(struct mon_reader_bin *rp, unsigned int size)
379{
380
381 size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
382 rp->b_cnt -= size;
383 if ((rp->b_out += size) >= rp->b_size)
384 rp->b_out -= rp->b_size;
385}
386
387static void mon_buff_area_fill(const struct mon_reader_bin *rp,
388 unsigned int offset, unsigned int size)
389{
390 struct mon_bin_hdr *ep;
391
392 ep = MON_OFF2HDR(rp, offset);
393 memset(s: ep, c: 0, PKT_SIZE);
394 ep->type = '@';
395 ep->len_cap = size - PKT_SIZE;
396}
397
398static inline char mon_bin_get_setup(unsigned char *setupb,
399 const struct urb *urb, char ev_type)
400{
401
402 if (urb->setup_packet == NULL)
403 return 'Z';
404 memcpy(to: setupb, from: urb->setup_packet, SETUP_LEN);
405 return 0;
406}
407
408static unsigned int mon_bin_get_data(const struct mon_reader_bin *rp,
409 unsigned int offset, struct urb *urb, unsigned int length,
410 char *flag)
411{
412 int i;
413 struct scatterlist *sg;
414 unsigned int this_len;
415
416 *flag = 0;
417 if (urb->num_sgs == 0) {
418 if (urb->transfer_buffer == NULL) {
419 *flag = 'Z';
420 return length;
421 }
422 mon_copy_to_buff(this: rp, off: offset, from: urb->transfer_buffer, length);
423 length = 0;
424
425 } else {
426 /* If IOMMU coalescing occurred, we cannot trust sg_page */
427 if (urb->transfer_flags & URB_DMA_SG_COMBINED) {
428 *flag = 'D';
429 return length;
430 }
431
432 /* Copy up to the first non-addressable segment */
433 for_each_sg(urb->sg, sg, urb->num_sgs, i) {
434 if (length == 0 || PageHighMem(page: sg_page(sg)))
435 break;
436 this_len = min_t(unsigned int, sg->length, length);
437 offset = mon_copy_to_buff(this: rp, off: offset, from: sg_virt(sg),
438 length: this_len);
439 length -= this_len;
440 }
441 if (i == 0)
442 *flag = 'D';
443 }
444
445 return length;
446}
447
448/*
449 * This is the look-ahead pass in case of 'C Zi', when actual_length cannot
450 * be used to determine the length of the whole contiguous buffer.
451 */
452static unsigned int mon_bin_collate_isodesc(const struct mon_reader_bin *rp,
453 struct urb *urb, unsigned int ndesc)
454{
455 struct usb_iso_packet_descriptor *fp;
456 unsigned int length;
457
458 length = 0;
459 fp = urb->iso_frame_desc;
460 while (ndesc-- != 0) {
461 if (fp->actual_length != 0) {
462 if (fp->offset + fp->actual_length > length)
463 length = fp->offset + fp->actual_length;
464 }
465 fp++;
466 }
467 return length;
468}
469
470static void mon_bin_get_isodesc(const struct mon_reader_bin *rp,
471 unsigned int offset, struct urb *urb, char ev_type, unsigned int ndesc)
472{
473 struct mon_bin_isodesc *dp;
474 struct usb_iso_packet_descriptor *fp;
475
476 fp = urb->iso_frame_desc;
477 while (ndesc-- != 0) {
478 dp = (struct mon_bin_isodesc *)
479 (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE);
480 dp->iso_status = fp->status;
481 dp->iso_off = fp->offset;
482 dp->iso_len = (ev_type == 'S') ? fp->length : fp->actual_length;
483 dp->_pad = 0;
484 if ((offset += sizeof(struct mon_bin_isodesc)) >= rp->b_size)
485 offset = 0;
486 fp++;
487 }
488}
489
490static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb,
491 char ev_type, int status)
492{
493 const struct usb_endpoint_descriptor *epd = &urb->ep->desc;
494 struct timespec64 ts;
495 unsigned long flags;
496 unsigned int urb_length;
497 unsigned int offset;
498 unsigned int length;
499 unsigned int delta;
500 unsigned int ndesc, lendesc;
501 unsigned char dir;
502 struct mon_bin_hdr *ep;
503 char data_tag = 0;
504
505 ktime_get_real_ts64(tv: &ts);
506
507 spin_lock_irqsave(&rp->b_lock, flags);
508
509 /*
510 * Find the maximum allowable length, then allocate space.
511 */
512 urb_length = (ev_type == 'S') ?
513 urb->transfer_buffer_length : urb->actual_length;
514 length = urb_length;
515
516 if (usb_endpoint_xfer_isoc(epd)) {
517 if (urb->number_of_packets < 0) {
518 ndesc = 0;
519 } else if (urb->number_of_packets >= ISODESC_MAX) {
520 ndesc = ISODESC_MAX;
521 } else {
522 ndesc = urb->number_of_packets;
523 }
524 if (ev_type == 'C' && usb_urb_dir_in(urb))
525 length = mon_bin_collate_isodesc(rp, urb, ndesc);
526 } else {
527 ndesc = 0;
528 }
529 lendesc = ndesc*sizeof(struct mon_bin_isodesc);
530
531 /* not an issue unless there's a subtle bug in a HCD somewhere */
532 if (length >= urb->transfer_buffer_length)
533 length = urb->transfer_buffer_length;
534
535 if (length >= rp->b_size/5)
536 length = rp->b_size/5;
537
538 if (usb_urb_dir_in(urb)) {
539 if (ev_type == 'S') {
540 length = 0;
541 data_tag = '<';
542 }
543 /* Cannot rely on endpoint number in case of control ep.0 */
544 dir = USB_DIR_IN;
545 } else {
546 if (ev_type == 'C') {
547 length = 0;
548 data_tag = '>';
549 }
550 dir = 0;
551 }
552
553 if (rp->mmap_active) {
554 offset = mon_buff_area_alloc_contiguous(rp,
555 size: length + PKT_SIZE + lendesc);
556 } else {
557 offset = mon_buff_area_alloc(rp, size: length + PKT_SIZE + lendesc);
558 }
559 if (offset == ~0) {
560 rp->cnt_lost++;
561 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
562 return;
563 }
564
565 ep = MON_OFF2HDR(rp, offset);
566 if ((offset += PKT_SIZE) >= rp->b_size) offset = 0;
567
568 /*
569 * Fill the allocated area.
570 */
571 memset(s: ep, c: 0, PKT_SIZE);
572 ep->type = ev_type;
573 ep->xfer_type = xfer_to_pipe[usb_endpoint_type(epd)];
574 ep->epnum = dir | usb_endpoint_num(epd);
575 ep->devnum = urb->dev->devnum;
576 ep->busnum = urb->dev->bus->busnum;
577 ep->id = (unsigned long) urb;
578 ep->ts_sec = ts.tv_sec;
579 ep->ts_usec = ts.tv_nsec / NSEC_PER_USEC;
580 ep->status = status;
581 ep->len_urb = urb_length;
582 ep->len_cap = length + lendesc;
583 ep->xfer_flags = urb->transfer_flags;
584
585 if (usb_endpoint_xfer_int(epd)) {
586 ep->interval = urb->interval;
587 } else if (usb_endpoint_xfer_isoc(epd)) {
588 ep->interval = urb->interval;
589 ep->start_frame = urb->start_frame;
590 ep->s.iso.error_count = urb->error_count;
591 ep->s.iso.numdesc = urb->number_of_packets;
592 }
593
594 if (usb_endpoint_xfer_control(epd) && ev_type == 'S') {
595 ep->flag_setup = mon_bin_get_setup(setupb: ep->s.setup, urb, ev_type);
596 } else {
597 ep->flag_setup = '-';
598 }
599
600 if (ndesc != 0) {
601 ep->ndesc = ndesc;
602 mon_bin_get_isodesc(rp, offset, urb, ev_type, ndesc);
603 if ((offset += lendesc) >= rp->b_size)
604 offset -= rp->b_size;
605 }
606
607 if (length != 0) {
608 length = mon_bin_get_data(rp, offset, urb, length,
609 flag: &ep->flag_data);
610 if (length > 0) {
611 delta = (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
612 ep->len_cap -= length;
613 delta -= (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
614 mon_buff_area_shrink(rp, size: delta);
615 }
616 } else {
617 ep->flag_data = data_tag;
618 }
619
620 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
621
622 wake_up(&rp->b_wait);
623}
624
625static void mon_bin_submit(void *data, struct urb *urb)
626{
627 struct mon_reader_bin *rp = data;
628 mon_bin_event(rp, urb, ev_type: 'S', status: -EINPROGRESS);
629}
630
631static void mon_bin_complete(void *data, struct urb *urb, int status)
632{
633 struct mon_reader_bin *rp = data;
634 mon_bin_event(rp, urb, ev_type: 'C', status);
635}
636
637static void mon_bin_error(void *data, struct urb *urb, int error)
638{
639 struct mon_reader_bin *rp = data;
640 struct timespec64 ts;
641 unsigned long flags;
642 unsigned int offset;
643 struct mon_bin_hdr *ep;
644
645 ktime_get_real_ts64(tv: &ts);
646
647 spin_lock_irqsave(&rp->b_lock, flags);
648
649 offset = mon_buff_area_alloc(rp, PKT_SIZE);
650 if (offset == ~0) {
651 /* Not incrementing cnt_lost. Just because. */
652 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
653 return;
654 }
655
656 ep = MON_OFF2HDR(rp, offset);
657
658 memset(s: ep, c: 0, PKT_SIZE);
659 ep->type = 'E';
660 ep->xfer_type = xfer_to_pipe[usb_endpoint_type(epd: &urb->ep->desc)];
661 ep->epnum = usb_urb_dir_in(urb) ? USB_DIR_IN : 0;
662 ep->epnum |= usb_endpoint_num(epd: &urb->ep->desc);
663 ep->devnum = urb->dev->devnum;
664 ep->busnum = urb->dev->bus->busnum;
665 ep->id = (unsigned long) urb;
666 ep->ts_sec = ts.tv_sec;
667 ep->ts_usec = ts.tv_nsec / NSEC_PER_USEC;
668 ep->status = error;
669
670 ep->flag_setup = '-';
671 ep->flag_data = 'E';
672
673 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
674
675 wake_up(&rp->b_wait);
676}
677
678static int mon_bin_open(struct inode *inode, struct file *file)
679{
680 struct mon_bus *mbus;
681 struct mon_reader_bin *rp;
682 size_t size;
683 int rc;
684
685 mutex_lock(lock: &mon_lock);
686 mbus = mon_bus_lookup(num: iminor(inode));
687 if (mbus == NULL) {
688 mutex_unlock(lock: &mon_lock);
689 return -ENODEV;
690 }
691 if (mbus != &mon_bus0 && mbus->u_bus == NULL) {
692 printk(KERN_ERR TAG ": consistency error on open\n");
693 mutex_unlock(lock: &mon_lock);
694 return -ENODEV;
695 }
696
697 rp = kzalloc(sizeof(struct mon_reader_bin), GFP_KERNEL);
698 if (rp == NULL) {
699 rc = -ENOMEM;
700 goto err_alloc;
701 }
702 spin_lock_init(&rp->b_lock);
703 init_waitqueue_head(&rp->b_wait);
704 mutex_init(&rp->fetch_lock);
705 rp->b_size = BUFF_DFL;
706
707 size = sizeof(struct mon_pgmap) * (rp->b_size/CHUNK_SIZE);
708 if ((rp->b_vec = kzalloc(size, GFP_KERNEL)) == NULL) {
709 rc = -ENOMEM;
710 goto err_allocvec;
711 }
712
713 if ((rc = mon_alloc_buff(map: rp->b_vec, npages: rp->b_size/CHUNK_SIZE)) < 0)
714 goto err_allocbuff;
715
716 rp->r.m_bus = mbus;
717 rp->r.r_data = rp;
718 rp->r.rnf_submit = mon_bin_submit;
719 rp->r.rnf_error = mon_bin_error;
720 rp->r.rnf_complete = mon_bin_complete;
721
722 mon_reader_add(mbus, r: &rp->r);
723
724 file->private_data = rp;
725 mutex_unlock(lock: &mon_lock);
726 return 0;
727
728err_allocbuff:
729 kfree(objp: rp->b_vec);
730err_allocvec:
731 kfree(objp: rp);
732err_alloc:
733 mutex_unlock(lock: &mon_lock);
734 return rc;
735}
736
737/*
738 * Extract an event from buffer and copy it to user space.
739 * Wait if there is no event ready.
740 * Returns zero or error.
741 */
742static int mon_bin_get_event(struct file *file, struct mon_reader_bin *rp,
743 struct mon_bin_hdr __user *hdr, unsigned int hdrbytes,
744 void __user *data, unsigned int nbytes)
745{
746 unsigned long flags;
747 struct mon_bin_hdr *ep;
748 size_t step_len;
749 unsigned int offset;
750 int rc;
751
752 mutex_lock(lock: &rp->fetch_lock);
753
754 if ((rc = mon_bin_wait_event(file, rp)) < 0) {
755 mutex_unlock(lock: &rp->fetch_lock);
756 return rc;
757 }
758
759 ep = MON_OFF2HDR(rp, offset: rp->b_out);
760
761 if (copy_to_user(to: hdr, from: ep, n: hdrbytes)) {
762 mutex_unlock(lock: &rp->fetch_lock);
763 return -EFAULT;
764 }
765
766 step_len = min(ep->len_cap, nbytes);
767 if ((offset = rp->b_out + PKT_SIZE) >= rp->b_size) offset = 0;
768
769 if (copy_from_buf(this: rp, off: offset, to: data, length: step_len)) {
770 mutex_unlock(lock: &rp->fetch_lock);
771 return -EFAULT;
772 }
773
774 spin_lock_irqsave(&rp->b_lock, flags);
775 mon_buff_area_free(rp, PKT_SIZE + ep->len_cap);
776 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
777 rp->b_read = 0;
778
779 mutex_unlock(lock: &rp->fetch_lock);
780 return 0;
781}
782
783static int mon_bin_release(struct inode *inode, struct file *file)
784{
785 struct mon_reader_bin *rp = file->private_data;
786 struct mon_bus* mbus = rp->r.m_bus;
787
788 mutex_lock(lock: &mon_lock);
789
790 if (mbus->nreaders <= 0) {
791 printk(KERN_ERR TAG ": consistency error on close\n");
792 mutex_unlock(lock: &mon_lock);
793 return 0;
794 }
795 mon_reader_del(mbus, r: &rp->r);
796
797 mon_free_buff(map: rp->b_vec, npages: rp->b_size/CHUNK_SIZE);
798 kfree(objp: rp->b_vec);
799 kfree(objp: rp);
800
801 mutex_unlock(lock: &mon_lock);
802 return 0;
803}
804
805static ssize_t mon_bin_read(struct file *file, char __user *buf,
806 size_t nbytes, loff_t *ppos)
807{
808 struct mon_reader_bin *rp = file->private_data;
809 unsigned int hdrbytes = PKT_SZ_API0;
810 unsigned long flags;
811 struct mon_bin_hdr *ep;
812 unsigned int offset;
813 size_t step_len;
814 char *ptr;
815 ssize_t done = 0;
816 int rc;
817
818 mutex_lock(lock: &rp->fetch_lock);
819
820 if ((rc = mon_bin_wait_event(file, rp)) < 0) {
821 mutex_unlock(lock: &rp->fetch_lock);
822 return rc;
823 }
824
825 ep = MON_OFF2HDR(rp, offset: rp->b_out);
826
827 if (rp->b_read < hdrbytes) {
828 step_len = min_t(size_t, nbytes, hdrbytes - rp->b_read);
829 ptr = ((char *)ep) + rp->b_read;
830 if (step_len && copy_to_user(to: buf, from: ptr, n: step_len)) {
831 mutex_unlock(lock: &rp->fetch_lock);
832 return -EFAULT;
833 }
834 nbytes -= step_len;
835 buf += step_len;
836 rp->b_read += step_len;
837 done += step_len;
838 }
839
840 if (rp->b_read >= hdrbytes) {
841 step_len = ep->len_cap;
842 step_len -= rp->b_read - hdrbytes;
843 if (step_len > nbytes)
844 step_len = nbytes;
845 offset = rp->b_out + PKT_SIZE;
846 offset += rp->b_read - hdrbytes;
847 if (offset >= rp->b_size)
848 offset -= rp->b_size;
849 if (copy_from_buf(this: rp, off: offset, to: buf, length: step_len)) {
850 mutex_unlock(lock: &rp->fetch_lock);
851 return -EFAULT;
852 }
853 nbytes -= step_len;
854 buf += step_len;
855 rp->b_read += step_len;
856 done += step_len;
857 }
858
859 /*
860 * Check if whole packet was read, and if so, jump to the next one.
861 */
862 if (rp->b_read >= hdrbytes + ep->len_cap) {
863 spin_lock_irqsave(&rp->b_lock, flags);
864 mon_buff_area_free(rp, PKT_SIZE + ep->len_cap);
865 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
866 rp->b_read = 0;
867 }
868
869 mutex_unlock(lock: &rp->fetch_lock);
870 return done;
871}
872
873/*
874 * Remove at most nevents from chunked buffer.
875 * Returns the number of removed events.
876 */
877static int mon_bin_flush(struct mon_reader_bin *rp, unsigned nevents)
878{
879 unsigned long flags;
880 struct mon_bin_hdr *ep;
881 int i;
882
883 mutex_lock(lock: &rp->fetch_lock);
884 spin_lock_irqsave(&rp->b_lock, flags);
885 for (i = 0; i < nevents; ++i) {
886 if (MON_RING_EMPTY(rp))
887 break;
888
889 ep = MON_OFF2HDR(rp, offset: rp->b_out);
890 mon_buff_area_free(rp, PKT_SIZE + ep->len_cap);
891 }
892 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
893 rp->b_read = 0;
894 mutex_unlock(lock: &rp->fetch_lock);
895 return i;
896}
897
898/*
899 * Fetch at most max event offsets into the buffer and put them into vec.
900 * The events are usually freed later with mon_bin_flush.
901 * Return the effective number of events fetched.
902 */
903static int mon_bin_fetch(struct file *file, struct mon_reader_bin *rp,
904 u32 __user *vec, unsigned int max)
905{
906 unsigned int cur_out;
907 unsigned int bytes, avail;
908 unsigned int size;
909 unsigned int nevents;
910 struct mon_bin_hdr *ep;
911 unsigned long flags;
912 int rc;
913
914 mutex_lock(lock: &rp->fetch_lock);
915
916 if ((rc = mon_bin_wait_event(file, rp)) < 0) {
917 mutex_unlock(lock: &rp->fetch_lock);
918 return rc;
919 }
920
921 spin_lock_irqsave(&rp->b_lock, flags);
922 avail = rp->b_cnt;
923 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
924
925 cur_out = rp->b_out;
926 nevents = 0;
927 bytes = 0;
928 while (bytes < avail) {
929 if (nevents >= max)
930 break;
931
932 ep = MON_OFF2HDR(rp, offset: cur_out);
933 if (put_user(cur_out, &vec[nevents])) {
934 mutex_unlock(lock: &rp->fetch_lock);
935 return -EFAULT;
936 }
937
938 nevents++;
939 size = ep->len_cap + PKT_SIZE;
940 size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
941 if ((cur_out += size) >= rp->b_size)
942 cur_out -= rp->b_size;
943 bytes += size;
944 }
945
946 mutex_unlock(lock: &rp->fetch_lock);
947 return nevents;
948}
949
950/*
951 * Count events. This is almost the same as the above mon_bin_fetch,
952 * only we do not store offsets into user vector, and we have no limit.
953 */
954static int mon_bin_queued(struct mon_reader_bin *rp)
955{
956 unsigned int cur_out;
957 unsigned int bytes, avail;
958 unsigned int size;
959 unsigned int nevents;
960 struct mon_bin_hdr *ep;
961 unsigned long flags;
962
963 mutex_lock(lock: &rp->fetch_lock);
964
965 spin_lock_irqsave(&rp->b_lock, flags);
966 avail = rp->b_cnt;
967 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
968
969 cur_out = rp->b_out;
970 nevents = 0;
971 bytes = 0;
972 while (bytes < avail) {
973 ep = MON_OFF2HDR(rp, offset: cur_out);
974
975 nevents++;
976 size = ep->len_cap + PKT_SIZE;
977 size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
978 if ((cur_out += size) >= rp->b_size)
979 cur_out -= rp->b_size;
980 bytes += size;
981 }
982
983 mutex_unlock(lock: &rp->fetch_lock);
984 return nevents;
985}
986
987/*
988 */
989static long mon_bin_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
990{
991 struct mon_reader_bin *rp = file->private_data;
992 // struct mon_bus* mbus = rp->r.m_bus;
993 int ret = 0;
994 struct mon_bin_hdr *ep;
995 unsigned long flags;
996
997 switch (cmd) {
998
999 case MON_IOCQ_URB_LEN:
1000 /*
1001 * N.B. This only returns the size of data, without the header.
1002 */
1003 spin_lock_irqsave(&rp->b_lock, flags);
1004 if (!MON_RING_EMPTY(rp)) {
1005 ep = MON_OFF2HDR(rp, offset: rp->b_out);
1006 ret = ep->len_cap;
1007 }
1008 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
1009 break;
1010
1011 case MON_IOCQ_RING_SIZE:
1012 mutex_lock(lock: &rp->fetch_lock);
1013 ret = rp->b_size;
1014 mutex_unlock(lock: &rp->fetch_lock);
1015 break;
1016
1017 case MON_IOCT_RING_SIZE:
1018 /*
1019 * Changing the buffer size will flush it's contents; the new
1020 * buffer is allocated before releasing the old one to be sure
1021 * the device will stay functional also in case of memory
1022 * pressure.
1023 */
1024 {
1025 int size;
1026 struct mon_pgmap *vec;
1027
1028 if (arg < BUFF_MIN || arg > BUFF_MAX)
1029 return -EINVAL;
1030
1031 size = CHUNK_ALIGN(arg);
1032 vec = kcalloc(size / CHUNK_SIZE, sizeof(struct mon_pgmap),
1033 GFP_KERNEL);
1034 if (vec == NULL) {
1035 ret = -ENOMEM;
1036 break;
1037 }
1038
1039 ret = mon_alloc_buff(map: vec, npages: size/CHUNK_SIZE);
1040 if (ret < 0) {
1041 kfree(objp: vec);
1042 break;
1043 }
1044
1045 mutex_lock(lock: &rp->fetch_lock);
1046 spin_lock_irqsave(&rp->b_lock, flags);
1047 if (rp->mmap_active) {
1048 mon_free_buff(map: vec, npages: size/CHUNK_SIZE);
1049 kfree(objp: vec);
1050 ret = -EBUSY;
1051 } else {
1052 mon_free_buff(map: rp->b_vec, npages: rp->b_size/CHUNK_SIZE);
1053 kfree(objp: rp->b_vec);
1054 rp->b_vec = vec;
1055 rp->b_size = size;
1056 rp->b_read = rp->b_in = rp->b_out = rp->b_cnt = 0;
1057 rp->cnt_lost = 0;
1058 }
1059 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
1060 mutex_unlock(lock: &rp->fetch_lock);
1061 }
1062 break;
1063
1064 case MON_IOCH_MFLUSH:
1065 ret = mon_bin_flush(rp, nevents: arg);
1066 break;
1067
1068 case MON_IOCX_GET:
1069 case MON_IOCX_GETX:
1070 {
1071 struct mon_bin_get getb;
1072
1073 if (copy_from_user(to: &getb, from: (void __user *)arg,
1074 n: sizeof(struct mon_bin_get)))
1075 return -EFAULT;
1076
1077 if (getb.alloc > 0x10000000) /* Want to cast to u32 */
1078 return -EINVAL;
1079 ret = mon_bin_get_event(file, rp, hdr: getb.hdr,
1080 hdrbytes: (cmd == MON_IOCX_GET)? PKT_SZ_API0: PKT_SZ_API1,
1081 data: getb.data, nbytes: (unsigned int)getb.alloc);
1082 }
1083 break;
1084
1085 case MON_IOCX_MFETCH:
1086 {
1087 struct mon_bin_mfetch mfetch;
1088 struct mon_bin_mfetch __user *uptr;
1089
1090 uptr = (struct mon_bin_mfetch __user *)arg;
1091
1092 if (copy_from_user(to: &mfetch, from: uptr, n: sizeof(mfetch)))
1093 return -EFAULT;
1094
1095 if (mfetch.nflush) {
1096 ret = mon_bin_flush(rp, nevents: mfetch.nflush);
1097 if (ret < 0)
1098 return ret;
1099 if (put_user(ret, &uptr->nflush))
1100 return -EFAULT;
1101 }
1102 ret = mon_bin_fetch(file, rp, vec: mfetch.offvec, max: mfetch.nfetch);
1103 if (ret < 0)
1104 return ret;
1105 if (put_user(ret, &uptr->nfetch))
1106 return -EFAULT;
1107 ret = 0;
1108 }
1109 break;
1110
1111 case MON_IOCG_STATS: {
1112 struct mon_bin_stats __user *sp;
1113 unsigned int nevents;
1114 unsigned int ndropped;
1115
1116 spin_lock_irqsave(&rp->b_lock, flags);
1117 ndropped = rp->cnt_lost;
1118 rp->cnt_lost = 0;
1119 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
1120 nevents = mon_bin_queued(rp);
1121
1122 sp = (struct mon_bin_stats __user *)arg;
1123 if (put_user(ndropped, &sp->dropped))
1124 return -EFAULT;
1125 if (put_user(nevents, &sp->queued))
1126 return -EFAULT;
1127
1128 }
1129 break;
1130
1131 default:
1132 return -ENOTTY;
1133 }
1134
1135 return ret;
1136}
1137
1138#ifdef CONFIG_COMPAT
1139static long mon_bin_compat_ioctl(struct file *file,
1140 unsigned int cmd, unsigned long arg)
1141{
1142 struct mon_reader_bin *rp = file->private_data;
1143 int ret;
1144
1145 switch (cmd) {
1146
1147 case MON_IOCX_GET32:
1148 case MON_IOCX_GETX32:
1149 {
1150 struct mon_bin_get32 getb;
1151
1152 if (copy_from_user(to: &getb, from: (void __user *)arg,
1153 n: sizeof(struct mon_bin_get32)))
1154 return -EFAULT;
1155
1156 ret = mon_bin_get_event(file, rp, hdr: compat_ptr(uptr: getb.hdr32),
1157 hdrbytes: (cmd == MON_IOCX_GET32)? PKT_SZ_API0: PKT_SZ_API1,
1158 data: compat_ptr(uptr: getb.data32), nbytes: getb.alloc32);
1159 if (ret < 0)
1160 return ret;
1161 }
1162 return 0;
1163
1164 case MON_IOCX_MFETCH32:
1165 {
1166 struct mon_bin_mfetch32 mfetch;
1167 struct mon_bin_mfetch32 __user *uptr;
1168
1169 uptr = (struct mon_bin_mfetch32 __user *) compat_ptr(uptr: arg);
1170
1171 if (copy_from_user(to: &mfetch, from: uptr, n: sizeof(mfetch)))
1172 return -EFAULT;
1173
1174 if (mfetch.nflush32) {
1175 ret = mon_bin_flush(rp, nevents: mfetch.nflush32);
1176 if (ret < 0)
1177 return ret;
1178 if (put_user(ret, &uptr->nflush32))
1179 return -EFAULT;
1180 }
1181 ret = mon_bin_fetch(file, rp, vec: compat_ptr(uptr: mfetch.offvec32),
1182 max: mfetch.nfetch32);
1183 if (ret < 0)
1184 return ret;
1185 if (put_user(ret, &uptr->nfetch32))
1186 return -EFAULT;
1187 }
1188 return 0;
1189
1190 case MON_IOCG_STATS:
1191 return mon_bin_ioctl(file, cmd, arg: (unsigned long) compat_ptr(uptr: arg));
1192
1193 case MON_IOCQ_URB_LEN:
1194 case MON_IOCQ_RING_SIZE:
1195 case MON_IOCT_RING_SIZE:
1196 case MON_IOCH_MFLUSH:
1197 return mon_bin_ioctl(file, cmd, arg);
1198
1199 default:
1200 ;
1201 }
1202 return -ENOTTY;
1203}
1204#endif /* CONFIG_COMPAT */
1205
1206static __poll_t
1207mon_bin_poll(struct file *file, struct poll_table_struct *wait)
1208{
1209 struct mon_reader_bin *rp = file->private_data;
1210 __poll_t mask = 0;
1211 unsigned long flags;
1212
1213 if (file->f_mode & FMODE_READ)
1214 poll_wait(filp: file, wait_address: &rp->b_wait, p: wait);
1215
1216 spin_lock_irqsave(&rp->b_lock, flags);
1217 if (!MON_RING_EMPTY(rp))
1218 mask |= EPOLLIN | EPOLLRDNORM; /* readable */
1219 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
1220 return mask;
1221}
1222
1223/*
1224 * open and close: just keep track of how many times the device is
1225 * mapped, to use the proper memory allocation function.
1226 */
1227static void mon_bin_vma_open(struct vm_area_struct *vma)
1228{
1229 struct mon_reader_bin *rp = vma->vm_private_data;
1230 unsigned long flags;
1231
1232 spin_lock_irqsave(&rp->b_lock, flags);
1233 rp->mmap_active++;
1234 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
1235}
1236
1237static void mon_bin_vma_close(struct vm_area_struct *vma)
1238{
1239 unsigned long flags;
1240
1241 struct mon_reader_bin *rp = vma->vm_private_data;
1242 spin_lock_irqsave(&rp->b_lock, flags);
1243 rp->mmap_active--;
1244 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
1245}
1246
1247/*
1248 * Map ring pages to user space.
1249 */
1250static vm_fault_t mon_bin_vma_fault(struct vm_fault *vmf)
1251{
1252 struct mon_reader_bin *rp = vmf->vma->vm_private_data;
1253 unsigned long offset, chunk_idx;
1254 struct page *pageptr;
1255 unsigned long flags;
1256
1257 spin_lock_irqsave(&rp->b_lock, flags);
1258 offset = vmf->pgoff << PAGE_SHIFT;
1259 if (offset >= rp->b_size) {
1260 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
1261 return VM_FAULT_SIGBUS;
1262 }
1263 chunk_idx = offset / CHUNK_SIZE;
1264 pageptr = rp->b_vec[chunk_idx].pg;
1265 get_page(page: pageptr);
1266 vmf->page = pageptr;
1267 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
1268 return 0;
1269}
1270
1271static const struct vm_operations_struct mon_bin_vm_ops = {
1272 .open = mon_bin_vma_open,
1273 .close = mon_bin_vma_close,
1274 .fault = mon_bin_vma_fault,
1275};
1276
1277static int mon_bin_mmap(struct file *filp, struct vm_area_struct *vma)
1278{
1279 /* don't do anything here: "fault" will set up page table entries */
1280 vma->vm_ops = &mon_bin_vm_ops;
1281
1282 if (vma->vm_flags & VM_WRITE)
1283 return -EPERM;
1284
1285 vm_flags_mod(vma, VM_DONTEXPAND | VM_DONTDUMP, VM_MAYWRITE);
1286 vma->vm_private_data = filp->private_data;
1287 mon_bin_vma_open(vma);
1288 return 0;
1289}
1290
1291static const struct file_operations mon_fops_binary = {
1292 .owner = THIS_MODULE,
1293 .open = mon_bin_open,
1294 .read = mon_bin_read,
1295 /* .write = mon_text_write, */
1296 .poll = mon_bin_poll,
1297 .unlocked_ioctl = mon_bin_ioctl,
1298#ifdef CONFIG_COMPAT
1299 .compat_ioctl = mon_bin_compat_ioctl,
1300#endif
1301 .release = mon_bin_release,
1302 .mmap = mon_bin_mmap,
1303};
1304
1305static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp)
1306{
1307 DECLARE_WAITQUEUE(waita, current);
1308 unsigned long flags;
1309
1310 add_wait_queue(wq_head: &rp->b_wait, wq_entry: &waita);
1311 set_current_state(TASK_INTERRUPTIBLE);
1312
1313 spin_lock_irqsave(&rp->b_lock, flags);
1314 while (MON_RING_EMPTY(rp)) {
1315 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
1316
1317 if (file->f_flags & O_NONBLOCK) {
1318 set_current_state(TASK_RUNNING);
1319 remove_wait_queue(wq_head: &rp->b_wait, wq_entry: &waita);
1320 return -EWOULDBLOCK; /* Same as EAGAIN in Linux */
1321 }
1322 schedule();
1323 if (signal_pending(current)) {
1324 remove_wait_queue(wq_head: &rp->b_wait, wq_entry: &waita);
1325 return -EINTR;
1326 }
1327 set_current_state(TASK_INTERRUPTIBLE);
1328
1329 spin_lock_irqsave(&rp->b_lock, flags);
1330 }
1331 spin_unlock_irqrestore(lock: &rp->b_lock, flags);
1332
1333 set_current_state(TASK_RUNNING);
1334 remove_wait_queue(wq_head: &rp->b_wait, wq_entry: &waita);
1335 return 0;
1336}
1337
1338static int mon_alloc_buff(struct mon_pgmap *map, int npages)
1339{
1340 int n;
1341 unsigned long vaddr;
1342
1343 for (n = 0; n < npages; n++) {
1344 vaddr = get_zeroed_page(GFP_KERNEL);
1345 if (vaddr == 0) {
1346 while (n-- != 0)
1347 free_page((unsigned long) map[n].ptr);
1348 return -ENOMEM;
1349 }
1350 map[n].ptr = (unsigned char *) vaddr;
1351 map[n].pg = virt_to_page((void *) vaddr);
1352 }
1353 return 0;
1354}
1355
1356static void mon_free_buff(struct mon_pgmap *map, int npages)
1357{
1358 int n;
1359
1360 for (n = 0; n < npages; n++)
1361 free_page((unsigned long) map[n].ptr);
1362}
1363
1364int mon_bin_add(struct mon_bus *mbus, const struct usb_bus *ubus)
1365{
1366 struct device *dev;
1367 unsigned minor = ubus? ubus->busnum: 0;
1368
1369 if (minor >= MON_BIN_MAX_MINOR)
1370 return 0;
1371
1372 dev = device_create(cls: &mon_bin_class, parent: ubus ? ubus->controller : NULL,
1373 MKDEV(MAJOR(mon_bin_dev0), minor), NULL,
1374 fmt: "usbmon%d", minor);
1375 if (IS_ERR(ptr: dev))
1376 return 0;
1377
1378 mbus->classdev = dev;
1379 return 1;
1380}
1381
1382void mon_bin_del(struct mon_bus *mbus)
1383{
1384 device_destroy(cls: &mon_bin_class, devt: mbus->classdev->devt);
1385}
1386
1387int __init mon_bin_init(void)
1388{
1389 int rc;
1390
1391 rc = class_register(class: &mon_bin_class);
1392 if (rc)
1393 goto err_class;
1394
1395 rc = alloc_chrdev_region(&mon_bin_dev0, 0, MON_BIN_MAX_MINOR, "usbmon");
1396 if (rc < 0)
1397 goto err_dev;
1398
1399 cdev_init(&mon_bin_cdev, &mon_fops_binary);
1400 mon_bin_cdev.owner = THIS_MODULE;
1401
1402 rc = cdev_add(&mon_bin_cdev, mon_bin_dev0, MON_BIN_MAX_MINOR);
1403 if (rc < 0)
1404 goto err_add;
1405
1406 return 0;
1407
1408err_add:
1409 unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR);
1410err_dev:
1411 class_unregister(class: &mon_bin_class);
1412err_class:
1413 return rc;
1414}
1415
1416void mon_bin_exit(void)
1417{
1418 cdev_del(&mon_bin_cdev);
1419 unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR);
1420 class_unregister(class: &mon_bin_class);
1421}
1422