Commit | Line | Data |
---|---|---|
6f23ee1f PZ |
1 | /* |
2 | * The USB Monitor, inspired by Dave Harding's USBMon. | |
3 | * | |
4 | * This is a binary format reader. | |
5 | * | |
6 | * Copyright (C) 2006 Paolo Abeni (paolo.abeni@email.it) | |
ce7cd137 | 7 | * Copyright (C) 2006,2007 Pete Zaitcev (zaitcev@redhat.com) |
6f23ee1f PZ |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/types.h> | |
12 | #include <linux/fs.h> | |
13 | #include <linux/cdev.h> | |
14 | #include <linux/usb.h> | |
15 | #include <linux/poll.h> | |
16 | #include <linux/compat.h> | |
17 | #include <linux/mm.h> | |
1af46fd7 | 18 | #include <linux/smp_lock.h> |
6f23ee1f PZ |
19 | |
20 | #include <asm/uaccess.h> | |
21 | ||
22 | #include "usb_mon.h" | |
23 | ||
24 | /* | |
25 | * Defined by USB 2.0 clause 9.3, table 9.2. | |
26 | */ | |
27 | #define SETUP_LEN 8 | |
28 | ||
29 | /* ioctl macros */ | |
30 | #define MON_IOC_MAGIC 0x92 | |
31 | ||
32 | #define MON_IOCQ_URB_LEN _IO(MON_IOC_MAGIC, 1) | |
33 | /* #2 used to be MON_IOCX_URB, removed before it got into Linus tree */ | |
34 | #define MON_IOCG_STATS _IOR(MON_IOC_MAGIC, 3, struct mon_bin_stats) | |
35 | #define MON_IOCT_RING_SIZE _IO(MON_IOC_MAGIC, 4) | |
36 | #define MON_IOCQ_RING_SIZE _IO(MON_IOC_MAGIC, 5) | |
37 | #define MON_IOCX_GET _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get) | |
38 | #define MON_IOCX_MFETCH _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch) | |
39 | #define MON_IOCH_MFLUSH _IO(MON_IOC_MAGIC, 8) | |
471c604d PZ |
40 | /* #9 was MON_IOCT_SETAPI */ |
41 | #define MON_IOCX_GETX _IOW(MON_IOC_MAGIC, 10, struct mon_bin_get) | |
7abce6be | 42 | |
6f23ee1f PZ |
43 | #ifdef CONFIG_COMPAT |
44 | #define MON_IOCX_GET32 _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get32) | |
45 | #define MON_IOCX_MFETCH32 _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch32) | |
471c604d | 46 | #define MON_IOCX_GETX32 _IOW(MON_IOC_MAGIC, 10, struct mon_bin_get32) |
6f23ee1f PZ |
47 | #endif |
48 | ||
49 | /* | |
50 | * Some architectures have enormous basic pages (16KB for ia64, 64KB for ppc). | |
51 | * But it's all right. Just use a simple way to make sure the chunk is never | |
52 | * smaller than a page. | |
53 | * | |
54 | * N.B. An application does not know our chunk size. | |
55 | * | |
56 | * Woops, get_zeroed_page() returns a single page. I guess we're stuck with | |
57 | * page-sized chunks for the time being. | |
58 | */ | |
59 | #define CHUNK_SIZE PAGE_SIZE | |
60 | #define CHUNK_ALIGN(x) (((x)+CHUNK_SIZE-1) & ~(CHUNK_SIZE-1)) | |
61 | ||
62 | /* | |
63 | * The magic limit was calculated so that it allows the monitoring | |
64 | * application to pick data once in two ticks. This way, another application, | |
65 | * which presumably drives the bus, gets to hog CPU, yet we collect our data. | |
66 | * If HZ is 100, a 480 mbit/s bus drives 614 KB every jiffy. USB has an | |
67 | * enormous overhead built into the bus protocol, so we need about 1000 KB. | |
68 | * | |
69 | * This is still too much for most cases, where we just snoop a few | |
70 | * descriptor fetches for enumeration. So, the default is a "reasonable" | |
71 | * amount for systems with HZ=250 and incomplete bus saturation. | |
72 | * | |
73 | * XXX What about multi-megabyte URBs which take minutes to transfer? | |
74 | */ | |
75 | #define BUFF_MAX CHUNK_ALIGN(1200*1024) | |
76 | #define BUFF_DFL CHUNK_ALIGN(300*1024) | |
77 | #define BUFF_MIN CHUNK_ALIGN(8*1024) | |
78 | ||
79 | /* | |
80 | * The per-event API header (2 per URB). | |
81 | * | |
82 | * This structure is seen in userland as defined by the documentation. | |
83 | */ | |
84 | struct mon_bin_hdr { | |
85 | u64 id; /* URB ID - from submission to callback */ | |
86 | unsigned char type; /* Same as in text API; extensible. */ | |
87 | unsigned char xfer_type; /* ISO, Intr, Control, Bulk */ | |
88 | unsigned char epnum; /* Endpoint number and transfer direction */ | |
89 | unsigned char devnum; /* Device address */ | |
90 | unsigned short busnum; /* Bus number */ | |
91 | char flag_setup; | |
92 | char flag_data; | |
93 | s64 ts_sec; /* gettimeofday */ | |
94 | s32 ts_usec; /* gettimeofday */ | |
95 | int status; | |
96 | unsigned int len_urb; /* Length of data (submitted or actual) */ | |
97 | unsigned int len_cap; /* Delivered length */ | |
471c604d PZ |
98 | union { |
99 | unsigned char setup[SETUP_LEN]; /* Only for Control S-type */ | |
100 | struct iso_rec { | |
101 | int error_count; | |
102 | int numdesc; | |
103 | } iso; | |
104 | } s; | |
105 | int interval; | |
106 | int start_frame; | |
107 | unsigned int xfer_flags; | |
108 | unsigned int ndesc; /* Actual number of ISO descriptors */ | |
109 | }; | |
110 | ||
111 | /* | |
112 | * ISO vector, packed into the head of data stream. | |
113 | * This has to take 16 bytes to make sure that the end of buffer | |
114 | * wrap is not happening in the middle of a descriptor. | |
115 | */ | |
116 | struct mon_bin_isodesc { | |
117 | int iso_status; | |
118 | unsigned int iso_off; | |
119 | unsigned int iso_len; | |
120 | u32 _pad; | |
6f23ee1f PZ |
121 | }; |
122 | ||
123 | /* per file statistic */ | |
124 | struct mon_bin_stats { | |
125 | u32 queued; | |
126 | u32 dropped; | |
127 | }; | |
128 | ||
129 | struct mon_bin_get { | |
471c604d | 130 | struct mon_bin_hdr __user *hdr; /* Can be 48 bytes or 64. */ |
6f23ee1f PZ |
131 | void __user *data; |
132 | size_t alloc; /* Length of data (can be zero) */ | |
133 | }; | |
134 | ||
135 | struct mon_bin_mfetch { | |
136 | u32 __user *offvec; /* Vector of events fetched */ | |
137 | u32 nfetch; /* Number of events to fetch (out: fetched) */ | |
138 | u32 nflush; /* Number of events to flush */ | |
139 | }; | |
140 | ||
141 | #ifdef CONFIG_COMPAT | |
142 | struct mon_bin_get32 { | |
143 | u32 hdr32; | |
144 | u32 data32; | |
145 | u32 alloc32; | |
146 | }; | |
147 | ||
148 | struct mon_bin_mfetch32 { | |
149 | u32 offvec32; | |
150 | u32 nfetch32; | |
151 | u32 nflush32; | |
152 | }; | |
153 | #endif | |
154 | ||
155 | /* Having these two values same prevents wrapping of the mon_bin_hdr */ | |
156 | #define PKT_ALIGN 64 | |
157 | #define PKT_SIZE 64 | |
158 | ||
471c604d PZ |
159 | #define PKT_SZ_API0 48 /* API 0 (2.6.20) size */ |
160 | #define PKT_SZ_API1 64 /* API 1 size: extra fields */ | |
161 | ||
162 | #define ISODESC_MAX 128 /* Same number as usbfs allows, 2048 bytes. */ | |
163 | ||
6f23ee1f PZ |
164 | /* max number of USB bus supported */ |
165 | #define MON_BIN_MAX_MINOR 128 | |
166 | ||
167 | /* | |
168 | * The buffer: map of used pages. | |
169 | */ | |
170 | struct mon_pgmap { | |
171 | struct page *pg; | |
172 | unsigned char *ptr; /* XXX just use page_to_virt everywhere? */ | |
173 | }; | |
174 | ||
175 | /* | |
176 | * This gets associated with an open file struct. | |
177 | */ | |
178 | struct mon_reader_bin { | |
179 | /* The buffer: one per open. */ | |
180 | spinlock_t b_lock; /* Protect b_cnt, b_in */ | |
181 | unsigned int b_size; /* Current size of the buffer - bytes */ | |
182 | unsigned int b_cnt; /* Bytes used */ | |
183 | unsigned int b_in, b_out; /* Offsets into buffer - bytes */ | |
184 | unsigned int b_read; /* Amount of read data in curr. pkt. */ | |
185 | struct mon_pgmap *b_vec; /* The map array */ | |
186 | wait_queue_head_t b_wait; /* Wait for data here */ | |
187 | ||
188 | struct mutex fetch_lock; /* Protect b_read, b_out */ | |
189 | int mmap_active; | |
190 | ||
191 | /* A list of these is needed for "bus 0". Some time later. */ | |
192 | struct mon_reader r; | |
193 | ||
194 | /* Stats */ | |
195 | unsigned int cnt_lost; | |
196 | }; | |
197 | ||
198 | static inline struct mon_bin_hdr *MON_OFF2HDR(const struct mon_reader_bin *rp, | |
199 | unsigned int offset) | |
200 | { | |
201 | return (struct mon_bin_hdr *) | |
202 | (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE); | |
203 | } | |
204 | ||
205 | #define MON_RING_EMPTY(rp) ((rp)->b_cnt == 0) | |
206 | ||
30c7431d PZ |
207 | static unsigned char xfer_to_pipe[4] = { |
208 | PIPE_CONTROL, PIPE_ISOCHRONOUS, PIPE_BULK, PIPE_INTERRUPT | |
209 | }; | |
210 | ||
ce7cd137 | 211 | static struct class *mon_bin_class; |
6f23ee1f PZ |
212 | static dev_t mon_bin_dev0; |
213 | static struct cdev mon_bin_cdev; | |
214 | ||
215 | static void mon_buff_area_fill(const struct mon_reader_bin *rp, | |
216 | unsigned int offset, unsigned int size); | |
217 | static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp); | |
218 | static int mon_alloc_buff(struct mon_pgmap *map, int npages); | |
219 | static void mon_free_buff(struct mon_pgmap *map, int npages); | |
220 | ||
221 | /* | |
222 | * This is a "chunked memcpy". It does not manipulate any counters. | |
223 | * But it returns the new offset for repeated application. | |
224 | */ | |
225 | unsigned int mon_copy_to_buff(const struct mon_reader_bin *this, | |
226 | unsigned int off, const unsigned char *from, unsigned int length) | |
227 | { | |
228 | unsigned int step_len; | |
229 | unsigned char *buf; | |
230 | unsigned int in_page; | |
231 | ||
232 | while (length) { | |
233 | /* | |
234 | * Determine step_len. | |
235 | */ | |
236 | step_len = length; | |
237 | in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1)); | |
238 | if (in_page < step_len) | |
239 | step_len = in_page; | |
240 | ||
241 | /* | |
242 | * Copy data and advance pointers. | |
243 | */ | |
244 | buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE; | |
245 | memcpy(buf, from, step_len); | |
246 | if ((off += step_len) >= this->b_size) off = 0; | |
247 | from += step_len; | |
248 | length -= step_len; | |
249 | } | |
250 | return off; | |
251 | } | |
252 | ||
253 | /* | |
254 | * This is a little worse than the above because it's "chunked copy_to_user". | |
255 | * The return value is an error code, not an offset. | |
256 | */ | |
257 | static int copy_from_buf(const struct mon_reader_bin *this, unsigned int off, | |
258 | char __user *to, int length) | |
259 | { | |
260 | unsigned int step_len; | |
261 | unsigned char *buf; | |
262 | unsigned int in_page; | |
263 | ||
264 | while (length) { | |
265 | /* | |
266 | * Determine step_len. | |
267 | */ | |
268 | step_len = length; | |
269 | in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1)); | |
270 | if (in_page < step_len) | |
271 | step_len = in_page; | |
272 | ||
273 | /* | |
274 | * Copy data and advance pointers. | |
275 | */ | |
276 | buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE; | |
277 | if (copy_to_user(to, buf, step_len)) | |
278 | return -EINVAL; | |
279 | if ((off += step_len) >= this->b_size) off = 0; | |
280 | to += step_len; | |
281 | length -= step_len; | |
282 | } | |
283 | return 0; | |
284 | } | |
285 | ||
286 | /* | |
287 | * Allocate an (aligned) area in the buffer. | |
288 | * This is called under b_lock. | |
289 | * Returns ~0 on failure. | |
290 | */ | |
291 | static unsigned int mon_buff_area_alloc(struct mon_reader_bin *rp, | |
292 | unsigned int size) | |
293 | { | |
294 | unsigned int offset; | |
295 | ||
296 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
297 | if (rp->b_cnt + size > rp->b_size) | |
298 | return ~0; | |
299 | offset = rp->b_in; | |
300 | rp->b_cnt += size; | |
301 | if ((rp->b_in += size) >= rp->b_size) | |
302 | rp->b_in -= rp->b_size; | |
303 | return offset; | |
304 | } | |
305 | ||
306 | /* | |
307 | * This is the same thing as mon_buff_area_alloc, only it does not allow | |
308 | * buffers to wrap. This is needed by applications which pass references | |
309 | * into mmap-ed buffers up their stacks (libpcap can do that). | |
310 | * | |
311 | * Currently, we always have the header stuck with the data, although | |
312 | * it is not strictly speaking necessary. | |
313 | * | |
314 | * When a buffer would wrap, we place a filler packet to mark the space. | |
315 | */ | |
316 | static unsigned int mon_buff_area_alloc_contiguous(struct mon_reader_bin *rp, | |
317 | unsigned int size) | |
318 | { | |
319 | unsigned int offset; | |
320 | unsigned int fill_size; | |
321 | ||
322 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
323 | if (rp->b_cnt + size > rp->b_size) | |
324 | return ~0; | |
325 | if (rp->b_in + size > rp->b_size) { | |
326 | /* | |
327 | * This would wrap. Find if we still have space after | |
328 | * skipping to the end of the buffer. If we do, place | |
329 | * a filler packet and allocate a new packet. | |
330 | */ | |
331 | fill_size = rp->b_size - rp->b_in; | |
332 | if (rp->b_cnt + size + fill_size > rp->b_size) | |
333 | return ~0; | |
334 | mon_buff_area_fill(rp, rp->b_in, fill_size); | |
335 | ||
336 | offset = 0; | |
337 | rp->b_in = size; | |
338 | rp->b_cnt += size + fill_size; | |
339 | } else if (rp->b_in + size == rp->b_size) { | |
340 | offset = rp->b_in; | |
341 | rp->b_in = 0; | |
342 | rp->b_cnt += size; | |
343 | } else { | |
344 | offset = rp->b_in; | |
345 | rp->b_in += size; | |
346 | rp->b_cnt += size; | |
347 | } | |
348 | return offset; | |
349 | } | |
350 | ||
351 | /* | |
352 | * Return a few (kilo-)bytes to the head of the buffer. | |
353 | * This is used if a DMA fetch fails. | |
354 | */ | |
355 | static void mon_buff_area_shrink(struct mon_reader_bin *rp, unsigned int size) | |
356 | { | |
357 | ||
358 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
359 | rp->b_cnt -= size; | |
360 | if (rp->b_in < size) | |
361 | rp->b_in += rp->b_size; | |
362 | rp->b_in -= size; | |
363 | } | |
364 | ||
365 | /* | |
366 | * This has to be called under both b_lock and fetch_lock, because | |
367 | * it accesses both b_cnt and b_out. | |
368 | */ | |
369 | static void mon_buff_area_free(struct mon_reader_bin *rp, unsigned int size) | |
370 | { | |
371 | ||
372 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
373 | rp->b_cnt -= size; | |
374 | if ((rp->b_out += size) >= rp->b_size) | |
375 | rp->b_out -= rp->b_size; | |
376 | } | |
377 | ||
378 | static void mon_buff_area_fill(const struct mon_reader_bin *rp, | |
379 | unsigned int offset, unsigned int size) | |
380 | { | |
381 | struct mon_bin_hdr *ep; | |
382 | ||
383 | ep = MON_OFF2HDR(rp, offset); | |
384 | memset(ep, 0, PKT_SIZE); | |
385 | ep->type = '@'; | |
386 | ep->len_cap = size - PKT_SIZE; | |
387 | } | |
388 | ||
389 | static inline char mon_bin_get_setup(unsigned char *setupb, | |
390 | const struct urb *urb, char ev_type) | |
391 | { | |
392 | ||
6f23ee1f PZ |
393 | if (urb->setup_packet == NULL) |
394 | return 'Z'; | |
6f23ee1f PZ |
395 | memcpy(setupb, urb->setup_packet, SETUP_LEN); |
396 | return 0; | |
397 | } | |
398 | ||
399 | static char mon_bin_get_data(const struct mon_reader_bin *rp, | |
400 | unsigned int offset, struct urb *urb, unsigned int length) | |
401 | { | |
402 | ||
ecb658d3 PZ |
403 | if (urb->dev->bus->uses_dma && |
404 | (urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) { | |
6f23ee1f PZ |
405 | mon_dmapeek_vec(rp, offset, urb->transfer_dma, length); |
406 | return 0; | |
407 | } | |
408 | ||
409 | if (urb->transfer_buffer == NULL) | |
410 | return 'Z'; | |
411 | ||
412 | mon_copy_to_buff(rp, offset, urb->transfer_buffer, length); | |
413 | return 0; | |
414 | } | |
415 | ||
471c604d PZ |
416 | static void mon_bin_get_isodesc(const struct mon_reader_bin *rp, |
417 | unsigned int offset, struct urb *urb, char ev_type, unsigned int ndesc) | |
418 | { | |
419 | struct mon_bin_isodesc *dp; | |
420 | struct usb_iso_packet_descriptor *fp; | |
421 | ||
422 | fp = urb->iso_frame_desc; | |
423 | while (ndesc-- != 0) { | |
424 | dp = (struct mon_bin_isodesc *) | |
425 | (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE); | |
426 | dp->iso_status = fp->status; | |
427 | dp->iso_off = fp->offset; | |
428 | dp->iso_len = (ev_type == 'S') ? fp->length : fp->actual_length; | |
429 | dp->_pad = 0; | |
430 | if ((offset += sizeof(struct mon_bin_isodesc)) >= rp->b_size) | |
431 | offset = 0; | |
432 | fp++; | |
433 | } | |
434 | } | |
435 | ||
6f23ee1f | 436 | static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb, |
9347d51c | 437 | char ev_type, int status) |
6f23ee1f | 438 | { |
30c7431d | 439 | const struct usb_endpoint_descriptor *epd = &urb->ep->desc; |
6f23ee1f PZ |
440 | unsigned long flags; |
441 | struct timeval ts; | |
442 | unsigned int urb_length; | |
443 | unsigned int offset; | |
444 | unsigned int length; | |
471c604d | 445 | unsigned int ndesc, lendesc; |
30c7431d | 446 | unsigned char dir; |
6f23ee1f PZ |
447 | struct mon_bin_hdr *ep; |
448 | char data_tag = 0; | |
449 | ||
450 | do_gettimeofday(&ts); | |
451 | ||
452 | spin_lock_irqsave(&rp->b_lock, flags); | |
453 | ||
454 | /* | |
455 | * Find the maximum allowable length, then allocate space. | |
456 | */ | |
471c604d PZ |
457 | if (usb_endpoint_xfer_isoc(epd)) { |
458 | if (urb->number_of_packets < 0) { | |
459 | ndesc = 0; | |
460 | } else if (urb->number_of_packets >= ISODESC_MAX) { | |
461 | ndesc = ISODESC_MAX; | |
462 | } else { | |
463 | ndesc = urb->number_of_packets; | |
464 | } | |
465 | } else { | |
466 | ndesc = 0; | |
467 | } | |
468 | lendesc = ndesc*sizeof(struct mon_bin_isodesc); | |
469 | ||
6f23ee1f PZ |
470 | urb_length = (ev_type == 'S') ? |
471 | urb->transfer_buffer_length : urb->actual_length; | |
472 | length = urb_length; | |
473 | ||
474 | if (length >= rp->b_size/5) | |
475 | length = rp->b_size/5; | |
476 | ||
18ea5d00 | 477 | if (usb_urb_dir_in(urb)) { |
6f23ee1f PZ |
478 | if (ev_type == 'S') { |
479 | length = 0; | |
480 | data_tag = '<'; | |
481 | } | |
30c7431d PZ |
482 | /* Cannot rely on endpoint number in case of control ep.0 */ |
483 | dir = USB_DIR_IN; | |
6f23ee1f PZ |
484 | } else { |
485 | if (ev_type == 'C') { | |
486 | length = 0; | |
487 | data_tag = '>'; | |
488 | } | |
30c7431d | 489 | dir = 0; |
6f23ee1f PZ |
490 | } |
491 | ||
471c604d PZ |
492 | if (rp->mmap_active) { |
493 | offset = mon_buff_area_alloc_contiguous(rp, | |
494 | length + PKT_SIZE + lendesc); | |
495 | } else { | |
496 | offset = mon_buff_area_alloc(rp, length + PKT_SIZE + lendesc); | |
497 | } | |
6f23ee1f PZ |
498 | if (offset == ~0) { |
499 | rp->cnt_lost++; | |
500 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
501 | return; | |
502 | } | |
503 | ||
504 | ep = MON_OFF2HDR(rp, offset); | |
505 | if ((offset += PKT_SIZE) >= rp->b_size) offset = 0; | |
506 | ||
507 | /* | |
508 | * Fill the allocated area. | |
509 | */ | |
510 | memset(ep, 0, PKT_SIZE); | |
511 | ep->type = ev_type; | |
30c7431d PZ |
512 | ep->xfer_type = xfer_to_pipe[usb_endpoint_type(epd)]; |
513 | ep->epnum = dir | usb_endpoint_num(epd); | |
18ea5d00 | 514 | ep->devnum = urb->dev->devnum; |
ecb658d3 | 515 | ep->busnum = urb->dev->bus->busnum; |
6f23ee1f PZ |
516 | ep->id = (unsigned long) urb; |
517 | ep->ts_sec = ts.tv_sec; | |
518 | ep->ts_usec = ts.tv_usec; | |
9347d51c | 519 | ep->status = status; |
6f23ee1f | 520 | ep->len_urb = urb_length; |
471c604d PZ |
521 | ep->len_cap = length + lendesc; |
522 | ep->xfer_flags = urb->transfer_flags; | |
523 | ||
524 | if (usb_endpoint_xfer_int(epd)) { | |
525 | ep->interval = urb->interval; | |
526 | } else if (usb_endpoint_xfer_isoc(epd)) { | |
527 | ep->interval = urb->interval; | |
528 | ep->start_frame = urb->start_frame; | |
529 | ep->s.iso.error_count = urb->error_count; | |
530 | ep->s.iso.numdesc = urb->number_of_packets; | |
531 | } | |
532 | ||
533 | if (usb_endpoint_xfer_control(epd) && ev_type == 'S') { | |
534 | ep->flag_setup = mon_bin_get_setup(ep->s.setup, urb, ev_type); | |
535 | } else { | |
536 | ep->flag_setup = '-'; | |
537 | } | |
538 | ||
539 | if (ndesc != 0) { | |
540 | ep->ndesc = ndesc; | |
541 | mon_bin_get_isodesc(rp, offset, urb, ev_type, ndesc); | |
542 | if ((offset += lendesc) >= rp->b_size) | |
543 | offset -= rp->b_size; | |
544 | } | |
6f23ee1f | 545 | |
6f23ee1f PZ |
546 | if (length != 0) { |
547 | ep->flag_data = mon_bin_get_data(rp, offset, urb, length); | |
548 | if (ep->flag_data != 0) { /* Yes, it's 0x00, not '0' */ | |
549 | ep->len_cap = 0; | |
550 | mon_buff_area_shrink(rp, length); | |
551 | } | |
552 | } else { | |
553 | ep->flag_data = data_tag; | |
554 | } | |
555 | ||
556 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
557 | ||
558 | wake_up(&rp->b_wait); | |
559 | } | |
560 | ||
561 | static void mon_bin_submit(void *data, struct urb *urb) | |
562 | { | |
563 | struct mon_reader_bin *rp = data; | |
9347d51c | 564 | mon_bin_event(rp, urb, 'S', -EINPROGRESS); |
6f23ee1f PZ |
565 | } |
566 | ||
9347d51c | 567 | static void mon_bin_complete(void *data, struct urb *urb, int status) |
6f23ee1f PZ |
568 | { |
569 | struct mon_reader_bin *rp = data; | |
9347d51c | 570 | mon_bin_event(rp, urb, 'C', status); |
6f23ee1f PZ |
571 | } |
572 | ||
573 | static void mon_bin_error(void *data, struct urb *urb, int error) | |
574 | { | |
575 | struct mon_reader_bin *rp = data; | |
576 | unsigned long flags; | |
577 | unsigned int offset; | |
578 | struct mon_bin_hdr *ep; | |
579 | ||
580 | spin_lock_irqsave(&rp->b_lock, flags); | |
581 | ||
582 | offset = mon_buff_area_alloc(rp, PKT_SIZE); | |
583 | if (offset == ~0) { | |
584 | /* Not incrementing cnt_lost. Just because. */ | |
585 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
586 | return; | |
587 | } | |
588 | ||
589 | ep = MON_OFF2HDR(rp, offset); | |
590 | ||
591 | memset(ep, 0, PKT_SIZE); | |
592 | ep->type = 'E'; | |
30c7431d PZ |
593 | ep->xfer_type = xfer_to_pipe[usb_endpoint_type(&urb->ep->desc)]; |
594 | ep->epnum = usb_urb_dir_in(urb) ? USB_DIR_IN : 0; | |
595 | ep->epnum |= usb_endpoint_num(&urb->ep->desc); | |
18ea5d00 | 596 | ep->devnum = urb->dev->devnum; |
ecb658d3 | 597 | ep->busnum = urb->dev->bus->busnum; |
6f23ee1f PZ |
598 | ep->id = (unsigned long) urb; |
599 | ep->status = error; | |
600 | ||
601 | ep->flag_setup = '-'; | |
602 | ep->flag_data = 'E'; | |
603 | ||
604 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
605 | ||
606 | wake_up(&rp->b_wait); | |
607 | } | |
608 | ||
609 | static int mon_bin_open(struct inode *inode, struct file *file) | |
610 | { | |
611 | struct mon_bus *mbus; | |
6f23ee1f PZ |
612 | struct mon_reader_bin *rp; |
613 | size_t size; | |
614 | int rc; | |
615 | ||
1af46fd7 | 616 | lock_kernel(); |
6f23ee1f PZ |
617 | mutex_lock(&mon_lock); |
618 | if ((mbus = mon_bus_lookup(iminor(inode))) == NULL) { | |
619 | mutex_unlock(&mon_lock); | |
1af46fd7 | 620 | unlock_kernel(); |
6f23ee1f PZ |
621 | return -ENODEV; |
622 | } | |
ecb658d3 | 623 | if (mbus != &mon_bus0 && mbus->u_bus == NULL) { |
6f23ee1f PZ |
624 | printk(KERN_ERR TAG ": consistency error on open\n"); |
625 | mutex_unlock(&mon_lock); | |
1af46fd7 | 626 | unlock_kernel(); |
6f23ee1f PZ |
627 | return -ENODEV; |
628 | } | |
629 | ||
630 | rp = kzalloc(sizeof(struct mon_reader_bin), GFP_KERNEL); | |
631 | if (rp == NULL) { | |
632 | rc = -ENOMEM; | |
633 | goto err_alloc; | |
634 | } | |
635 | spin_lock_init(&rp->b_lock); | |
636 | init_waitqueue_head(&rp->b_wait); | |
637 | mutex_init(&rp->fetch_lock); | |
638 | ||
639 | rp->b_size = BUFF_DFL; | |
640 | ||
641 | size = sizeof(struct mon_pgmap) * (rp->b_size/CHUNK_SIZE); | |
642 | if ((rp->b_vec = kzalloc(size, GFP_KERNEL)) == NULL) { | |
643 | rc = -ENOMEM; | |
644 | goto err_allocvec; | |
645 | } | |
646 | ||
647 | if ((rc = mon_alloc_buff(rp->b_vec, rp->b_size/CHUNK_SIZE)) < 0) | |
648 | goto err_allocbuff; | |
649 | ||
650 | rp->r.m_bus = mbus; | |
651 | rp->r.r_data = rp; | |
652 | rp->r.rnf_submit = mon_bin_submit; | |
653 | rp->r.rnf_error = mon_bin_error; | |
654 | rp->r.rnf_complete = mon_bin_complete; | |
655 | ||
656 | mon_reader_add(mbus, &rp->r); | |
657 | ||
658 | file->private_data = rp; | |
659 | mutex_unlock(&mon_lock); | |
1af46fd7 | 660 | unlock_kernel(); |
6f23ee1f PZ |
661 | return 0; |
662 | ||
663 | err_allocbuff: | |
664 | kfree(rp->b_vec); | |
665 | err_allocvec: | |
666 | kfree(rp); | |
667 | err_alloc: | |
668 | mutex_unlock(&mon_lock); | |
1af46fd7 | 669 | unlock_kernel(); |
6f23ee1f PZ |
670 | return rc; |
671 | } | |
672 | ||
673 | /* | |
674 | * Extract an event from buffer and copy it to user space. | |
675 | * Wait if there is no event ready. | |
676 | * Returns zero or error. | |
677 | */ | |
678 | static int mon_bin_get_event(struct file *file, struct mon_reader_bin *rp, | |
471c604d PZ |
679 | struct mon_bin_hdr __user *hdr, unsigned int hdrbytes, |
680 | void __user *data, unsigned int nbytes) | |
6f23ee1f PZ |
681 | { |
682 | unsigned long flags; | |
683 | struct mon_bin_hdr *ep; | |
684 | size_t step_len; | |
685 | unsigned int offset; | |
686 | int rc; | |
687 | ||
688 | mutex_lock(&rp->fetch_lock); | |
689 | ||
690 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { | |
691 | mutex_unlock(&rp->fetch_lock); | |
692 | return rc; | |
693 | } | |
694 | ||
695 | ep = MON_OFF2HDR(rp, rp->b_out); | |
696 | ||
471c604d | 697 | if (copy_to_user(hdr, ep, hdrbytes)) { |
6f23ee1f PZ |
698 | mutex_unlock(&rp->fetch_lock); |
699 | return -EFAULT; | |
700 | } | |
701 | ||
702 | step_len = min(ep->len_cap, nbytes); | |
703 | if ((offset = rp->b_out + PKT_SIZE) >= rp->b_size) offset = 0; | |
704 | ||
705 | if (copy_from_buf(rp, offset, data, step_len)) { | |
706 | mutex_unlock(&rp->fetch_lock); | |
707 | return -EFAULT; | |
708 | } | |
709 | ||
710 | spin_lock_irqsave(&rp->b_lock, flags); | |
711 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); | |
712 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
713 | rp->b_read = 0; | |
714 | ||
715 | mutex_unlock(&rp->fetch_lock); | |
716 | return 0; | |
717 | } | |
718 | ||
719 | static int mon_bin_release(struct inode *inode, struct file *file) | |
720 | { | |
721 | struct mon_reader_bin *rp = file->private_data; | |
722 | struct mon_bus* mbus = rp->r.m_bus; | |
723 | ||
724 | mutex_lock(&mon_lock); | |
725 | ||
726 | if (mbus->nreaders <= 0) { | |
727 | printk(KERN_ERR TAG ": consistency error on close\n"); | |
728 | mutex_unlock(&mon_lock); | |
729 | return 0; | |
730 | } | |
731 | mon_reader_del(mbus, &rp->r); | |
732 | ||
733 | mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE); | |
734 | kfree(rp->b_vec); | |
735 | kfree(rp); | |
736 | ||
737 | mutex_unlock(&mon_lock); | |
738 | return 0; | |
739 | } | |
740 | ||
741 | static ssize_t mon_bin_read(struct file *file, char __user *buf, | |
742 | size_t nbytes, loff_t *ppos) | |
743 | { | |
744 | struct mon_reader_bin *rp = file->private_data; | |
471c604d | 745 | unsigned int hdrbytes = PKT_SZ_API0; |
6f23ee1f PZ |
746 | unsigned long flags; |
747 | struct mon_bin_hdr *ep; | |
748 | unsigned int offset; | |
749 | size_t step_len; | |
750 | char *ptr; | |
751 | ssize_t done = 0; | |
752 | int rc; | |
753 | ||
754 | mutex_lock(&rp->fetch_lock); | |
755 | ||
756 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { | |
757 | mutex_unlock(&rp->fetch_lock); | |
758 | return rc; | |
759 | } | |
760 | ||
761 | ep = MON_OFF2HDR(rp, rp->b_out); | |
762 | ||
471c604d PZ |
763 | if (rp->b_read < hdrbytes) { |
764 | step_len = min(nbytes, (size_t)(hdrbytes - rp->b_read)); | |
6f23ee1f PZ |
765 | ptr = ((char *)ep) + rp->b_read; |
766 | if (step_len && copy_to_user(buf, ptr, step_len)) { | |
767 | mutex_unlock(&rp->fetch_lock); | |
768 | return -EFAULT; | |
769 | } | |
770 | nbytes -= step_len; | |
771 | buf += step_len; | |
772 | rp->b_read += step_len; | |
773 | done += step_len; | |
774 | } | |
775 | ||
471c604d | 776 | if (rp->b_read >= hdrbytes) { |
f1c0a2a3 | 777 | step_len = ep->len_cap; |
471c604d | 778 | step_len -= rp->b_read - hdrbytes; |
f1c0a2a3 PZ |
779 | if (step_len > nbytes) |
780 | step_len = nbytes; | |
6f23ee1f | 781 | offset = rp->b_out + PKT_SIZE; |
471c604d | 782 | offset += rp->b_read - hdrbytes; |
6f23ee1f PZ |
783 | if (offset >= rp->b_size) |
784 | offset -= rp->b_size; | |
785 | if (copy_from_buf(rp, offset, buf, step_len)) { | |
786 | mutex_unlock(&rp->fetch_lock); | |
787 | return -EFAULT; | |
788 | } | |
789 | nbytes -= step_len; | |
790 | buf += step_len; | |
791 | rp->b_read += step_len; | |
792 | done += step_len; | |
793 | } | |
794 | ||
795 | /* | |
796 | * Check if whole packet was read, and if so, jump to the next one. | |
797 | */ | |
471c604d | 798 | if (rp->b_read >= hdrbytes + ep->len_cap) { |
6f23ee1f PZ |
799 | spin_lock_irqsave(&rp->b_lock, flags); |
800 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); | |
801 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
802 | rp->b_read = 0; | |
803 | } | |
804 | ||
805 | mutex_unlock(&rp->fetch_lock); | |
806 | return done; | |
807 | } | |
808 | ||
809 | /* | |
810 | * Remove at most nevents from chunked buffer. | |
811 | * Returns the number of removed events. | |
812 | */ | |
813 | static int mon_bin_flush(struct mon_reader_bin *rp, unsigned nevents) | |
814 | { | |
815 | unsigned long flags; | |
816 | struct mon_bin_hdr *ep; | |
817 | int i; | |
818 | ||
819 | mutex_lock(&rp->fetch_lock); | |
820 | spin_lock_irqsave(&rp->b_lock, flags); | |
821 | for (i = 0; i < nevents; ++i) { | |
822 | if (MON_RING_EMPTY(rp)) | |
823 | break; | |
824 | ||
825 | ep = MON_OFF2HDR(rp, rp->b_out); | |
826 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); | |
827 | } | |
828 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
829 | rp->b_read = 0; | |
830 | mutex_unlock(&rp->fetch_lock); | |
831 | return i; | |
832 | } | |
833 | ||
834 | /* | |
835 | * Fetch at most max event offsets into the buffer and put them into vec. | |
836 | * The events are usually freed later with mon_bin_flush. | |
837 | * Return the effective number of events fetched. | |
838 | */ | |
839 | static int mon_bin_fetch(struct file *file, struct mon_reader_bin *rp, | |
840 | u32 __user *vec, unsigned int max) | |
841 | { | |
842 | unsigned int cur_out; | |
843 | unsigned int bytes, avail; | |
844 | unsigned int size; | |
845 | unsigned int nevents; | |
846 | struct mon_bin_hdr *ep; | |
847 | unsigned long flags; | |
848 | int rc; | |
849 | ||
850 | mutex_lock(&rp->fetch_lock); | |
851 | ||
852 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { | |
853 | mutex_unlock(&rp->fetch_lock); | |
854 | return rc; | |
855 | } | |
856 | ||
857 | spin_lock_irqsave(&rp->b_lock, flags); | |
858 | avail = rp->b_cnt; | |
859 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
860 | ||
861 | cur_out = rp->b_out; | |
862 | nevents = 0; | |
863 | bytes = 0; | |
864 | while (bytes < avail) { | |
865 | if (nevents >= max) | |
866 | break; | |
867 | ||
868 | ep = MON_OFF2HDR(rp, cur_out); | |
869 | if (put_user(cur_out, &vec[nevents])) { | |
870 | mutex_unlock(&rp->fetch_lock); | |
871 | return -EFAULT; | |
872 | } | |
873 | ||
874 | nevents++; | |
875 | size = ep->len_cap + PKT_SIZE; | |
876 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
877 | if ((cur_out += size) >= rp->b_size) | |
878 | cur_out -= rp->b_size; | |
879 | bytes += size; | |
880 | } | |
881 | ||
882 | mutex_unlock(&rp->fetch_lock); | |
883 | return nevents; | |
884 | } | |
885 | ||
886 | /* | |
887 | * Count events. This is almost the same as the above mon_bin_fetch, | |
888 | * only we do not store offsets into user vector, and we have no limit. | |
889 | */ | |
890 | static int mon_bin_queued(struct mon_reader_bin *rp) | |
891 | { | |
892 | unsigned int cur_out; | |
893 | unsigned int bytes, avail; | |
894 | unsigned int size; | |
895 | unsigned int nevents; | |
896 | struct mon_bin_hdr *ep; | |
897 | unsigned long flags; | |
898 | ||
899 | mutex_lock(&rp->fetch_lock); | |
900 | ||
901 | spin_lock_irqsave(&rp->b_lock, flags); | |
902 | avail = rp->b_cnt; | |
903 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
904 | ||
905 | cur_out = rp->b_out; | |
906 | nevents = 0; | |
907 | bytes = 0; | |
908 | while (bytes < avail) { | |
909 | ep = MON_OFF2HDR(rp, cur_out); | |
910 | ||
911 | nevents++; | |
912 | size = ep->len_cap + PKT_SIZE; | |
913 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
914 | if ((cur_out += size) >= rp->b_size) | |
915 | cur_out -= rp->b_size; | |
916 | bytes += size; | |
917 | } | |
918 | ||
919 | mutex_unlock(&rp->fetch_lock); | |
920 | return nevents; | |
921 | } | |
922 | ||
923 | /* | |
924 | */ | |
925 | static int mon_bin_ioctl(struct inode *inode, struct file *file, | |
926 | unsigned int cmd, unsigned long arg) | |
927 | { | |
928 | struct mon_reader_bin *rp = file->private_data; | |
929 | // struct mon_bus* mbus = rp->r.m_bus; | |
930 | int ret = 0; | |
931 | struct mon_bin_hdr *ep; | |
932 | unsigned long flags; | |
933 | ||
934 | switch (cmd) { | |
935 | ||
936 | case MON_IOCQ_URB_LEN: | |
937 | /* | |
938 | * N.B. This only returns the size of data, without the header. | |
939 | */ | |
940 | spin_lock_irqsave(&rp->b_lock, flags); | |
941 | if (!MON_RING_EMPTY(rp)) { | |
942 | ep = MON_OFF2HDR(rp, rp->b_out); | |
943 | ret = ep->len_cap; | |
944 | } | |
945 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
946 | break; | |
947 | ||
948 | case MON_IOCQ_RING_SIZE: | |
949 | ret = rp->b_size; | |
950 | break; | |
951 | ||
952 | case MON_IOCT_RING_SIZE: | |
953 | /* | |
954 | * Changing the buffer size will flush it's contents; the new | |
955 | * buffer is allocated before releasing the old one to be sure | |
956 | * the device will stay functional also in case of memory | |
957 | * pressure. | |
958 | */ | |
959 | { | |
960 | int size; | |
961 | struct mon_pgmap *vec; | |
962 | ||
963 | if (arg < BUFF_MIN || arg > BUFF_MAX) | |
964 | return -EINVAL; | |
965 | ||
966 | size = CHUNK_ALIGN(arg); | |
967 | if ((vec = kzalloc(sizeof(struct mon_pgmap) * (size/CHUNK_SIZE), | |
968 | GFP_KERNEL)) == NULL) { | |
969 | ret = -ENOMEM; | |
970 | break; | |
971 | } | |
972 | ||
973 | ret = mon_alloc_buff(vec, size/CHUNK_SIZE); | |
974 | if (ret < 0) { | |
975 | kfree(vec); | |
976 | break; | |
977 | } | |
978 | ||
979 | mutex_lock(&rp->fetch_lock); | |
980 | spin_lock_irqsave(&rp->b_lock, flags); | |
981 | mon_free_buff(rp->b_vec, size/CHUNK_SIZE); | |
982 | kfree(rp->b_vec); | |
983 | rp->b_vec = vec; | |
984 | rp->b_size = size; | |
985 | rp->b_read = rp->b_in = rp->b_out = rp->b_cnt = 0; | |
986 | rp->cnt_lost = 0; | |
987 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
988 | mutex_unlock(&rp->fetch_lock); | |
989 | } | |
990 | break; | |
991 | ||
992 | case MON_IOCH_MFLUSH: | |
993 | ret = mon_bin_flush(rp, arg); | |
994 | break; | |
995 | ||
996 | case MON_IOCX_GET: | |
471c604d | 997 | case MON_IOCX_GETX: |
6f23ee1f PZ |
998 | { |
999 | struct mon_bin_get getb; | |
1000 | ||
1001 | if (copy_from_user(&getb, (void __user *)arg, | |
1002 | sizeof(struct mon_bin_get))) | |
1003 | return -EFAULT; | |
1004 | ||
1005 | if (getb.alloc > 0x10000000) /* Want to cast to u32 */ | |
1006 | return -EINVAL; | |
471c604d PZ |
1007 | ret = mon_bin_get_event(file, rp, getb.hdr, |
1008 | (cmd == MON_IOCX_GET)? PKT_SZ_API0: PKT_SZ_API1, | |
1009 | getb.data, (unsigned int)getb.alloc); | |
6f23ee1f PZ |
1010 | } |
1011 | break; | |
1012 | ||
6f23ee1f PZ |
1013 | case MON_IOCX_MFETCH: |
1014 | { | |
1015 | struct mon_bin_mfetch mfetch; | |
1016 | struct mon_bin_mfetch __user *uptr; | |
1017 | ||
1018 | uptr = (struct mon_bin_mfetch __user *)arg; | |
1019 | ||
1020 | if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) | |
1021 | return -EFAULT; | |
1022 | ||
1023 | if (mfetch.nflush) { | |
1024 | ret = mon_bin_flush(rp, mfetch.nflush); | |
1025 | if (ret < 0) | |
1026 | return ret; | |
1027 | if (put_user(ret, &uptr->nflush)) | |
1028 | return -EFAULT; | |
1029 | } | |
1030 | ret = mon_bin_fetch(file, rp, mfetch.offvec, mfetch.nfetch); | |
1031 | if (ret < 0) | |
1032 | return ret; | |
1033 | if (put_user(ret, &uptr->nfetch)) | |
1034 | return -EFAULT; | |
1035 | ret = 0; | |
1036 | } | |
1037 | break; | |
1038 | ||
7abce6be PZ |
1039 | case MON_IOCG_STATS: { |
1040 | struct mon_bin_stats __user *sp; | |
1041 | unsigned int nevents; | |
1042 | unsigned int ndropped; | |
1043 | ||
1044 | spin_lock_irqsave(&rp->b_lock, flags); | |
1045 | ndropped = rp->cnt_lost; | |
1046 | rp->cnt_lost = 0; | |
1047 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
1048 | nevents = mon_bin_queued(rp); | |
1049 | ||
1050 | sp = (struct mon_bin_stats __user *)arg; | |
1051 | if (put_user(rp->cnt_lost, &sp->dropped)) | |
1052 | return -EFAULT; | |
1053 | if (put_user(nevents, &sp->queued)) | |
1054 | return -EFAULT; | |
1055 | ||
1056 | } | |
1057 | break; | |
1058 | ||
1059 | default: | |
1060 | return -ENOTTY; | |
1061 | } | |
1062 | ||
1063 | return ret; | |
1064 | } | |
1065 | ||
6f23ee1f | 1066 | #ifdef CONFIG_COMPAT |
7abce6be PZ |
1067 | static long mon_bin_compat_ioctl(struct file *file, |
1068 | unsigned int cmd, unsigned long arg) | |
1069 | { | |
1070 | struct mon_reader_bin *rp = file->private_data; | |
1071 | int ret; | |
1072 | ||
1073 | switch (cmd) { | |
1074 | ||
471c604d PZ |
1075 | case MON_IOCX_GET32: |
1076 | case MON_IOCX_GETX32: | |
1077 | { | |
7abce6be PZ |
1078 | struct mon_bin_get32 getb; |
1079 | ||
1080 | if (copy_from_user(&getb, (void __user *)arg, | |
1081 | sizeof(struct mon_bin_get32))) | |
1082 | return -EFAULT; | |
1083 | ||
471c604d PZ |
1084 | ret = mon_bin_get_event(file, rp, compat_ptr(getb.hdr32), |
1085 | (cmd == MON_IOCX_GET32)? PKT_SZ_API0: PKT_SZ_API1, | |
1086 | compat_ptr(getb.data32), getb.alloc32); | |
7abce6be PZ |
1087 | if (ret < 0) |
1088 | return ret; | |
1089 | } | |
1090 | return 0; | |
1091 | ||
6f23ee1f PZ |
1092 | case MON_IOCX_MFETCH32: |
1093 | { | |
1094 | struct mon_bin_mfetch32 mfetch; | |
1095 | struct mon_bin_mfetch32 __user *uptr; | |
1096 | ||
1097 | uptr = (struct mon_bin_mfetch32 __user *) compat_ptr(arg); | |
1098 | ||
1099 | if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) | |
1100 | return -EFAULT; | |
1101 | ||
1102 | if (mfetch.nflush32) { | |
1103 | ret = mon_bin_flush(rp, mfetch.nflush32); | |
1104 | if (ret < 0) | |
1105 | return ret; | |
1106 | if (put_user(ret, &uptr->nflush32)) | |
1107 | return -EFAULT; | |
1108 | } | |
1109 | ret = mon_bin_fetch(file, rp, compat_ptr(mfetch.offvec32), | |
1110 | mfetch.nfetch32); | |
1111 | if (ret < 0) | |
1112 | return ret; | |
1113 | if (put_user(ret, &uptr->nfetch32)) | |
1114 | return -EFAULT; | |
6f23ee1f | 1115 | } |
7abce6be | 1116 | return 0; |
6f23ee1f | 1117 | |
7abce6be PZ |
1118 | case MON_IOCG_STATS: |
1119 | return mon_bin_ioctl(NULL, file, cmd, | |
1120 | (unsigned long) compat_ptr(arg)); | |
6f23ee1f | 1121 | |
7abce6be PZ |
1122 | case MON_IOCQ_URB_LEN: |
1123 | case MON_IOCQ_RING_SIZE: | |
1124 | case MON_IOCT_RING_SIZE: | |
1125 | case MON_IOCH_MFLUSH: | |
1126 | return mon_bin_ioctl(NULL, file, cmd, arg); | |
6f23ee1f PZ |
1127 | |
1128 | default: | |
7abce6be | 1129 | ; |
6f23ee1f | 1130 | } |
7abce6be | 1131 | return -ENOTTY; |
6f23ee1f | 1132 | } |
7abce6be | 1133 | #endif /* CONFIG_COMPAT */ |
6f23ee1f PZ |
1134 | |
1135 | static unsigned int | |
1136 | mon_bin_poll(struct file *file, struct poll_table_struct *wait) | |
1137 | { | |
1138 | struct mon_reader_bin *rp = file->private_data; | |
1139 | unsigned int mask = 0; | |
1140 | unsigned long flags; | |
1141 | ||
1142 | if (file->f_mode & FMODE_READ) | |
1143 | poll_wait(file, &rp->b_wait, wait); | |
1144 | ||
1145 | spin_lock_irqsave(&rp->b_lock, flags); | |
1146 | if (!MON_RING_EMPTY(rp)) | |
1147 | mask |= POLLIN | POLLRDNORM; /* readable */ | |
1148 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
1149 | return mask; | |
1150 | } | |
1151 | ||
1152 | /* | |
1153 | * open and close: just keep track of how many times the device is | |
1154 | * mapped, to use the proper memory allocation function. | |
1155 | */ | |
1156 | static void mon_bin_vma_open(struct vm_area_struct *vma) | |
1157 | { | |
1158 | struct mon_reader_bin *rp = vma->vm_private_data; | |
1159 | rp->mmap_active++; | |
1160 | } | |
1161 | ||
1162 | static void mon_bin_vma_close(struct vm_area_struct *vma) | |
1163 | { | |
1164 | struct mon_reader_bin *rp = vma->vm_private_data; | |
1165 | rp->mmap_active--; | |
1166 | } | |
1167 | ||
1168 | /* | |
1169 | * Map ring pages to user space. | |
1170 | */ | |
041509db | 1171 | static int mon_bin_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
6f23ee1f PZ |
1172 | { |
1173 | struct mon_reader_bin *rp = vma->vm_private_data; | |
1174 | unsigned long offset, chunk_idx; | |
1175 | struct page *pageptr; | |
1176 | ||
041509db | 1177 | offset = vmf->pgoff << PAGE_SHIFT; |
6f23ee1f | 1178 | if (offset >= rp->b_size) |
041509db | 1179 | return VM_FAULT_SIGBUS; |
6f23ee1f PZ |
1180 | chunk_idx = offset / CHUNK_SIZE; |
1181 | pageptr = rp->b_vec[chunk_idx].pg; | |
1182 | get_page(pageptr); | |
041509db NP |
1183 | vmf->page = pageptr; |
1184 | return 0; | |
6f23ee1f PZ |
1185 | } |
1186 | ||
454459b0 | 1187 | static struct vm_operations_struct mon_bin_vm_ops = { |
6f23ee1f PZ |
1188 | .open = mon_bin_vma_open, |
1189 | .close = mon_bin_vma_close, | |
041509db | 1190 | .fault = mon_bin_vma_fault, |
6f23ee1f PZ |
1191 | }; |
1192 | ||
454459b0 | 1193 | static int mon_bin_mmap(struct file *filp, struct vm_area_struct *vma) |
6f23ee1f | 1194 | { |
041509db | 1195 | /* don't do anything here: "fault" will set up page table entries */ |
6f23ee1f PZ |
1196 | vma->vm_ops = &mon_bin_vm_ops; |
1197 | vma->vm_flags |= VM_RESERVED; | |
1198 | vma->vm_private_data = filp->private_data; | |
1199 | mon_bin_vma_open(vma); | |
1200 | return 0; | |
1201 | } | |
1202 | ||
0b3f5fe6 | 1203 | static const struct file_operations mon_fops_binary = { |
6f23ee1f PZ |
1204 | .owner = THIS_MODULE, |
1205 | .open = mon_bin_open, | |
1206 | .llseek = no_llseek, | |
1207 | .read = mon_bin_read, | |
1208 | /* .write = mon_text_write, */ | |
1209 | .poll = mon_bin_poll, | |
1210 | .ioctl = mon_bin_ioctl, | |
7abce6be PZ |
1211 | #ifdef CONFIG_COMPAT |
1212 | .compat_ioctl = mon_bin_compat_ioctl, | |
1213 | #endif | |
6f23ee1f | 1214 | .release = mon_bin_release, |
454459b0 | 1215 | .mmap = mon_bin_mmap, |
6f23ee1f PZ |
1216 | }; |
1217 | ||
1218 | static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp) | |
1219 | { | |
1220 | DECLARE_WAITQUEUE(waita, current); | |
1221 | unsigned long flags; | |
1222 | ||
1223 | add_wait_queue(&rp->b_wait, &waita); | |
1224 | set_current_state(TASK_INTERRUPTIBLE); | |
1225 | ||
1226 | spin_lock_irqsave(&rp->b_lock, flags); | |
1227 | while (MON_RING_EMPTY(rp)) { | |
1228 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
1229 | ||
1230 | if (file->f_flags & O_NONBLOCK) { | |
1231 | set_current_state(TASK_RUNNING); | |
1232 | remove_wait_queue(&rp->b_wait, &waita); | |
1233 | return -EWOULDBLOCK; /* Same as EAGAIN in Linux */ | |
1234 | } | |
1235 | schedule(); | |
1236 | if (signal_pending(current)) { | |
1237 | remove_wait_queue(&rp->b_wait, &waita); | |
1238 | return -EINTR; | |
1239 | } | |
1240 | set_current_state(TASK_INTERRUPTIBLE); | |
1241 | ||
1242 | spin_lock_irqsave(&rp->b_lock, flags); | |
1243 | } | |
1244 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
1245 | ||
1246 | set_current_state(TASK_RUNNING); | |
1247 | remove_wait_queue(&rp->b_wait, &waita); | |
1248 | return 0; | |
1249 | } | |
1250 | ||
1251 | static int mon_alloc_buff(struct mon_pgmap *map, int npages) | |
1252 | { | |
1253 | int n; | |
1254 | unsigned long vaddr; | |
1255 | ||
1256 | for (n = 0; n < npages; n++) { | |
1257 | vaddr = get_zeroed_page(GFP_KERNEL); | |
1258 | if (vaddr == 0) { | |
1259 | while (n-- != 0) | |
1260 | free_page((unsigned long) map[n].ptr); | |
1261 | return -ENOMEM; | |
1262 | } | |
1263 | map[n].ptr = (unsigned char *) vaddr; | |
1264 | map[n].pg = virt_to_page(vaddr); | |
1265 | } | |
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | static void mon_free_buff(struct mon_pgmap *map, int npages) | |
1270 | { | |
1271 | int n; | |
1272 | ||
1273 | for (n = 0; n < npages; n++) | |
1274 | free_page((unsigned long) map[n].ptr); | |
1275 | } | |
1276 | ||
ce7cd137 PZ |
1277 | int mon_bin_add(struct mon_bus *mbus, const struct usb_bus *ubus) |
1278 | { | |
1279 | struct device *dev; | |
1280 | unsigned minor = ubus? ubus->busnum: 0; | |
1281 | ||
1282 | if (minor >= MON_BIN_MAX_MINOR) | |
1283 | return 0; | |
1284 | ||
b0b090e5 GKH |
1285 | dev = device_create(mon_bin_class, ubus ? ubus->controller : NULL, |
1286 | MKDEV(MAJOR(mon_bin_dev0), minor), NULL, | |
1287 | "usbmon%d", minor); | |
ce7cd137 PZ |
1288 | if (IS_ERR(dev)) |
1289 | return 0; | |
1290 | ||
1291 | mbus->classdev = dev; | |
1292 | return 1; | |
1293 | } | |
1294 | ||
1295 | void mon_bin_del(struct mon_bus *mbus) | |
1296 | { | |
1297 | device_destroy(mon_bin_class, mbus->classdev->devt); | |
1298 | } | |
1299 | ||
6f23ee1f PZ |
1300 | int __init mon_bin_init(void) |
1301 | { | |
1302 | int rc; | |
1303 | ||
ce7cd137 PZ |
1304 | mon_bin_class = class_create(THIS_MODULE, "usbmon"); |
1305 | if (IS_ERR(mon_bin_class)) { | |
1306 | rc = PTR_ERR(mon_bin_class); | |
1307 | goto err_class; | |
1308 | } | |
1309 | ||
6f23ee1f PZ |
1310 | rc = alloc_chrdev_region(&mon_bin_dev0, 0, MON_BIN_MAX_MINOR, "usbmon"); |
1311 | if (rc < 0) | |
1312 | goto err_dev; | |
1313 | ||
1314 | cdev_init(&mon_bin_cdev, &mon_fops_binary); | |
1315 | mon_bin_cdev.owner = THIS_MODULE; | |
1316 | ||
1317 | rc = cdev_add(&mon_bin_cdev, mon_bin_dev0, MON_BIN_MAX_MINOR); | |
1318 | if (rc < 0) | |
1319 | goto err_add; | |
1320 | ||
1321 | return 0; | |
1322 | ||
1323 | err_add: | |
1324 | unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); | |
1325 | err_dev: | |
ce7cd137 PZ |
1326 | class_destroy(mon_bin_class); |
1327 | err_class: | |
6f23ee1f PZ |
1328 | return rc; |
1329 | } | |
1330 | ||
21641e3f | 1331 | void mon_bin_exit(void) |
6f23ee1f PZ |
1332 | { |
1333 | cdev_del(&mon_bin_cdev); | |
1334 | unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); | |
ce7cd137 | 1335 | class_destroy(mon_bin_class); |
6f23ee1f | 1336 | } |