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Commit | Line | Data |
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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. | |
6f23ee1f | 223 | */ |
4e9e9200 | 224 | static void mon_copy_to_buff(const struct mon_reader_bin *this, |
6f23ee1f PZ |
225 | unsigned int off, const unsigned char *from, unsigned int length) |
226 | { | |
227 | unsigned int step_len; | |
228 | unsigned char *buf; | |
229 | unsigned int in_page; | |
230 | ||
231 | while (length) { | |
232 | /* | |
233 | * Determine step_len. | |
234 | */ | |
235 | step_len = length; | |
236 | in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1)); | |
237 | if (in_page < step_len) | |
238 | step_len = in_page; | |
239 | ||
240 | /* | |
241 | * Copy data and advance pointers. | |
242 | */ | |
243 | buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE; | |
244 | memcpy(buf, from, step_len); | |
245 | if ((off += step_len) >= this->b_size) off = 0; | |
246 | from += step_len; | |
247 | length -= step_len; | |
248 | } | |
6f23ee1f PZ |
249 | } |
250 | ||
251 | /* | |
252 | * This is a little worse than the above because it's "chunked copy_to_user". | |
253 | * The return value is an error code, not an offset. | |
254 | */ | |
255 | static int copy_from_buf(const struct mon_reader_bin *this, unsigned int off, | |
256 | char __user *to, int length) | |
257 | { | |
258 | unsigned int step_len; | |
259 | unsigned char *buf; | |
260 | unsigned int in_page; | |
261 | ||
262 | while (length) { | |
263 | /* | |
264 | * Determine step_len. | |
265 | */ | |
266 | step_len = length; | |
267 | in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1)); | |
268 | if (in_page < step_len) | |
269 | step_len = in_page; | |
270 | ||
271 | /* | |
272 | * Copy data and advance pointers. | |
273 | */ | |
274 | buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE; | |
275 | if (copy_to_user(to, buf, step_len)) | |
276 | return -EINVAL; | |
277 | if ((off += step_len) >= this->b_size) off = 0; | |
278 | to += step_len; | |
279 | length -= step_len; | |
280 | } | |
281 | return 0; | |
282 | } | |
283 | ||
284 | /* | |
285 | * Allocate an (aligned) area in the buffer. | |
286 | * This is called under b_lock. | |
287 | * Returns ~0 on failure. | |
288 | */ | |
289 | static unsigned int mon_buff_area_alloc(struct mon_reader_bin *rp, | |
290 | unsigned int size) | |
291 | { | |
292 | unsigned int offset; | |
293 | ||
294 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
295 | if (rp->b_cnt + size > rp->b_size) | |
296 | return ~0; | |
297 | offset = rp->b_in; | |
298 | rp->b_cnt += size; | |
299 | if ((rp->b_in += size) >= rp->b_size) | |
300 | rp->b_in -= rp->b_size; | |
301 | return offset; | |
302 | } | |
303 | ||
304 | /* | |
305 | * This is the same thing as mon_buff_area_alloc, only it does not allow | |
306 | * buffers to wrap. This is needed by applications which pass references | |
307 | * into mmap-ed buffers up their stacks (libpcap can do that). | |
308 | * | |
309 | * Currently, we always have the header stuck with the data, although | |
310 | * it is not strictly speaking necessary. | |
311 | * | |
312 | * When a buffer would wrap, we place a filler packet to mark the space. | |
313 | */ | |
314 | static unsigned int mon_buff_area_alloc_contiguous(struct mon_reader_bin *rp, | |
315 | unsigned int size) | |
316 | { | |
317 | unsigned int offset; | |
318 | unsigned int fill_size; | |
319 | ||
320 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
321 | if (rp->b_cnt + size > rp->b_size) | |
322 | return ~0; | |
323 | if (rp->b_in + size > rp->b_size) { | |
324 | /* | |
325 | * This would wrap. Find if we still have space after | |
326 | * skipping to the end of the buffer. If we do, place | |
327 | * a filler packet and allocate a new packet. | |
328 | */ | |
329 | fill_size = rp->b_size - rp->b_in; | |
330 | if (rp->b_cnt + size + fill_size > rp->b_size) | |
331 | return ~0; | |
332 | mon_buff_area_fill(rp, rp->b_in, fill_size); | |
333 | ||
334 | offset = 0; | |
335 | rp->b_in = size; | |
336 | rp->b_cnt += size + fill_size; | |
337 | } else if (rp->b_in + size == rp->b_size) { | |
338 | offset = rp->b_in; | |
339 | rp->b_in = 0; | |
340 | rp->b_cnt += size; | |
341 | } else { | |
342 | offset = rp->b_in; | |
343 | rp->b_in += size; | |
344 | rp->b_cnt += size; | |
345 | } | |
346 | return offset; | |
347 | } | |
348 | ||
349 | /* | |
350 | * Return a few (kilo-)bytes to the head of the buffer. | |
fca94748 | 351 | * This is used if a data fetch fails. |
6f23ee1f PZ |
352 | */ |
353 | static void mon_buff_area_shrink(struct mon_reader_bin *rp, unsigned int size) | |
354 | { | |
355 | ||
fca94748 | 356 | /* size &= ~(PKT_ALIGN-1); -- we're called with aligned size */ |
6f23ee1f PZ |
357 | rp->b_cnt -= size; |
358 | if (rp->b_in < size) | |
359 | rp->b_in += rp->b_size; | |
360 | rp->b_in -= size; | |
361 | } | |
362 | ||
363 | /* | |
364 | * This has to be called under both b_lock and fetch_lock, because | |
365 | * it accesses both b_cnt and b_out. | |
366 | */ | |
367 | static void mon_buff_area_free(struct mon_reader_bin *rp, unsigned int size) | |
368 | { | |
369 | ||
370 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
371 | rp->b_cnt -= size; | |
372 | if ((rp->b_out += size) >= rp->b_size) | |
373 | rp->b_out -= rp->b_size; | |
374 | } | |
375 | ||
376 | static void mon_buff_area_fill(const struct mon_reader_bin *rp, | |
377 | unsigned int offset, unsigned int size) | |
378 | { | |
379 | struct mon_bin_hdr *ep; | |
380 | ||
381 | ep = MON_OFF2HDR(rp, offset); | |
382 | memset(ep, 0, PKT_SIZE); | |
383 | ep->type = '@'; | |
384 | ep->len_cap = size - PKT_SIZE; | |
385 | } | |
386 | ||
387 | static inline char mon_bin_get_setup(unsigned char *setupb, | |
388 | const struct urb *urb, char ev_type) | |
389 | { | |
390 | ||
6f23ee1f PZ |
391 | if (urb->setup_packet == NULL) |
392 | return 'Z'; | |
6f23ee1f PZ |
393 | memcpy(setupb, urb->setup_packet, SETUP_LEN); |
394 | return 0; | |
395 | } | |
396 | ||
397 | static char mon_bin_get_data(const struct mon_reader_bin *rp, | |
398 | unsigned int offset, struct urb *urb, unsigned int length) | |
399 | { | |
400 | ||
6f23ee1f PZ |
401 | if (urb->transfer_buffer == NULL) |
402 | return 'Z'; | |
6f23ee1f PZ |
403 | mon_copy_to_buff(rp, offset, urb->transfer_buffer, length); |
404 | return 0; | |
405 | } | |
406 | ||
471c604d PZ |
407 | static void mon_bin_get_isodesc(const struct mon_reader_bin *rp, |
408 | unsigned int offset, struct urb *urb, char ev_type, unsigned int ndesc) | |
409 | { | |
410 | struct mon_bin_isodesc *dp; | |
411 | struct usb_iso_packet_descriptor *fp; | |
412 | ||
413 | fp = urb->iso_frame_desc; | |
414 | while (ndesc-- != 0) { | |
415 | dp = (struct mon_bin_isodesc *) | |
416 | (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE); | |
417 | dp->iso_status = fp->status; | |
418 | dp->iso_off = fp->offset; | |
419 | dp->iso_len = (ev_type == 'S') ? fp->length : fp->actual_length; | |
420 | dp->_pad = 0; | |
421 | if ((offset += sizeof(struct mon_bin_isodesc)) >= rp->b_size) | |
422 | offset = 0; | |
423 | fp++; | |
424 | } | |
425 | } | |
426 | ||
6f23ee1f | 427 | static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb, |
9347d51c | 428 | char ev_type, int status) |
6f23ee1f | 429 | { |
30c7431d | 430 | const struct usb_endpoint_descriptor *epd = &urb->ep->desc; |
6f23ee1f PZ |
431 | unsigned long flags; |
432 | struct timeval ts; | |
433 | unsigned int urb_length; | |
434 | unsigned int offset; | |
435 | unsigned int length; | |
fca94748 | 436 | unsigned int delta; |
471c604d | 437 | unsigned int ndesc, lendesc; |
30c7431d | 438 | unsigned char dir; |
6f23ee1f PZ |
439 | struct mon_bin_hdr *ep; |
440 | char data_tag = 0; | |
441 | ||
442 | do_gettimeofday(&ts); | |
443 | ||
444 | spin_lock_irqsave(&rp->b_lock, flags); | |
445 | ||
446 | /* | |
447 | * Find the maximum allowable length, then allocate space. | |
448 | */ | |
471c604d PZ |
449 | if (usb_endpoint_xfer_isoc(epd)) { |
450 | if (urb->number_of_packets < 0) { | |
451 | ndesc = 0; | |
452 | } else if (urb->number_of_packets >= ISODESC_MAX) { | |
453 | ndesc = ISODESC_MAX; | |
454 | } else { | |
455 | ndesc = urb->number_of_packets; | |
456 | } | |
457 | } else { | |
458 | ndesc = 0; | |
459 | } | |
460 | lendesc = ndesc*sizeof(struct mon_bin_isodesc); | |
461 | ||
6f23ee1f PZ |
462 | urb_length = (ev_type == 'S') ? |
463 | urb->transfer_buffer_length : urb->actual_length; | |
464 | length = urb_length; | |
465 | ||
466 | if (length >= rp->b_size/5) | |
467 | length = rp->b_size/5; | |
468 | ||
18ea5d00 | 469 | if (usb_urb_dir_in(urb)) { |
6f23ee1f PZ |
470 | if (ev_type == 'S') { |
471 | length = 0; | |
472 | data_tag = '<'; | |
473 | } | |
30c7431d PZ |
474 | /* Cannot rely on endpoint number in case of control ep.0 */ |
475 | dir = USB_DIR_IN; | |
6f23ee1f PZ |
476 | } else { |
477 | if (ev_type == 'C') { | |
478 | length = 0; | |
479 | data_tag = '>'; | |
480 | } | |
30c7431d | 481 | dir = 0; |
6f23ee1f PZ |
482 | } |
483 | ||
471c604d PZ |
484 | if (rp->mmap_active) { |
485 | offset = mon_buff_area_alloc_contiguous(rp, | |
486 | length + PKT_SIZE + lendesc); | |
487 | } else { | |
488 | offset = mon_buff_area_alloc(rp, length + PKT_SIZE + lendesc); | |
489 | } | |
6f23ee1f PZ |
490 | if (offset == ~0) { |
491 | rp->cnt_lost++; | |
492 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
493 | return; | |
494 | } | |
495 | ||
496 | ep = MON_OFF2HDR(rp, offset); | |
497 | if ((offset += PKT_SIZE) >= rp->b_size) offset = 0; | |
498 | ||
499 | /* | |
500 | * Fill the allocated area. | |
501 | */ | |
502 | memset(ep, 0, PKT_SIZE); | |
503 | ep->type = ev_type; | |
30c7431d PZ |
504 | ep->xfer_type = xfer_to_pipe[usb_endpoint_type(epd)]; |
505 | ep->epnum = dir | usb_endpoint_num(epd); | |
18ea5d00 | 506 | ep->devnum = urb->dev->devnum; |
ecb658d3 | 507 | ep->busnum = urb->dev->bus->busnum; |
6f23ee1f PZ |
508 | ep->id = (unsigned long) urb; |
509 | ep->ts_sec = ts.tv_sec; | |
510 | ep->ts_usec = ts.tv_usec; | |
9347d51c | 511 | ep->status = status; |
6f23ee1f | 512 | ep->len_urb = urb_length; |
471c604d PZ |
513 | ep->len_cap = length + lendesc; |
514 | ep->xfer_flags = urb->transfer_flags; | |
515 | ||
516 | if (usb_endpoint_xfer_int(epd)) { | |
517 | ep->interval = urb->interval; | |
518 | } else if (usb_endpoint_xfer_isoc(epd)) { | |
519 | ep->interval = urb->interval; | |
520 | ep->start_frame = urb->start_frame; | |
521 | ep->s.iso.error_count = urb->error_count; | |
522 | ep->s.iso.numdesc = urb->number_of_packets; | |
523 | } | |
524 | ||
525 | if (usb_endpoint_xfer_control(epd) && ev_type == 'S') { | |
526 | ep->flag_setup = mon_bin_get_setup(ep->s.setup, urb, ev_type); | |
527 | } else { | |
528 | ep->flag_setup = '-'; | |
529 | } | |
530 | ||
531 | if (ndesc != 0) { | |
532 | ep->ndesc = ndesc; | |
533 | mon_bin_get_isodesc(rp, offset, urb, ev_type, ndesc); | |
534 | if ((offset += lendesc) >= rp->b_size) | |
535 | offset -= rp->b_size; | |
536 | } | |
6f23ee1f | 537 | |
6f23ee1f PZ |
538 | if (length != 0) { |
539 | ep->flag_data = mon_bin_get_data(rp, offset, urb, length); | |
540 | if (ep->flag_data != 0) { /* Yes, it's 0x00, not '0' */ | |
fca94748 AS |
541 | delta = (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
542 | ep->len_cap -= length; | |
543 | delta -= (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
544 | mon_buff_area_shrink(rp, delta); | |
6f23ee1f PZ |
545 | } |
546 | } else { | |
547 | ep->flag_data = data_tag; | |
548 | } | |
549 | ||
550 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
551 | ||
552 | wake_up(&rp->b_wait); | |
553 | } | |
554 | ||
555 | static void mon_bin_submit(void *data, struct urb *urb) | |
556 | { | |
557 | struct mon_reader_bin *rp = data; | |
9347d51c | 558 | mon_bin_event(rp, urb, 'S', -EINPROGRESS); |
6f23ee1f PZ |
559 | } |
560 | ||
9347d51c | 561 | static void mon_bin_complete(void *data, struct urb *urb, int status) |
6f23ee1f PZ |
562 | { |
563 | struct mon_reader_bin *rp = data; | |
9347d51c | 564 | mon_bin_event(rp, urb, 'C', status); |
6f23ee1f PZ |
565 | } |
566 | ||
567 | static void mon_bin_error(void *data, struct urb *urb, int error) | |
568 | { | |
569 | struct mon_reader_bin *rp = data; | |
570 | unsigned long flags; | |
571 | unsigned int offset; | |
572 | struct mon_bin_hdr *ep; | |
573 | ||
574 | spin_lock_irqsave(&rp->b_lock, flags); | |
575 | ||
576 | offset = mon_buff_area_alloc(rp, PKT_SIZE); | |
577 | if (offset == ~0) { | |
578 | /* Not incrementing cnt_lost. Just because. */ | |
579 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
580 | return; | |
581 | } | |
582 | ||
583 | ep = MON_OFF2HDR(rp, offset); | |
584 | ||
585 | memset(ep, 0, PKT_SIZE); | |
586 | ep->type = 'E'; | |
30c7431d PZ |
587 | ep->xfer_type = xfer_to_pipe[usb_endpoint_type(&urb->ep->desc)]; |
588 | ep->epnum = usb_urb_dir_in(urb) ? USB_DIR_IN : 0; | |
589 | ep->epnum |= usb_endpoint_num(&urb->ep->desc); | |
18ea5d00 | 590 | ep->devnum = urb->dev->devnum; |
ecb658d3 | 591 | ep->busnum = urb->dev->bus->busnum; |
6f23ee1f PZ |
592 | ep->id = (unsigned long) urb; |
593 | ep->status = error; | |
594 | ||
595 | ep->flag_setup = '-'; | |
596 | ep->flag_data = 'E'; | |
597 | ||
598 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
599 | ||
600 | wake_up(&rp->b_wait); | |
601 | } | |
602 | ||
603 | static int mon_bin_open(struct inode *inode, struct file *file) | |
604 | { | |
605 | struct mon_bus *mbus; | |
6f23ee1f PZ |
606 | struct mon_reader_bin *rp; |
607 | size_t size; | |
608 | int rc; | |
609 | ||
1af46fd7 | 610 | lock_kernel(); |
6f23ee1f PZ |
611 | mutex_lock(&mon_lock); |
612 | if ((mbus = mon_bus_lookup(iminor(inode))) == NULL) { | |
613 | mutex_unlock(&mon_lock); | |
1af46fd7 | 614 | unlock_kernel(); |
6f23ee1f PZ |
615 | return -ENODEV; |
616 | } | |
ecb658d3 | 617 | if (mbus != &mon_bus0 && mbus->u_bus == NULL) { |
6f23ee1f PZ |
618 | printk(KERN_ERR TAG ": consistency error on open\n"); |
619 | mutex_unlock(&mon_lock); | |
1af46fd7 | 620 | unlock_kernel(); |
6f23ee1f PZ |
621 | return -ENODEV; |
622 | } | |
623 | ||
624 | rp = kzalloc(sizeof(struct mon_reader_bin), GFP_KERNEL); | |
625 | if (rp == NULL) { | |
626 | rc = -ENOMEM; | |
627 | goto err_alloc; | |
628 | } | |
629 | spin_lock_init(&rp->b_lock); | |
630 | init_waitqueue_head(&rp->b_wait); | |
631 | mutex_init(&rp->fetch_lock); | |
6f23ee1f PZ |
632 | rp->b_size = BUFF_DFL; |
633 | ||
634 | size = sizeof(struct mon_pgmap) * (rp->b_size/CHUNK_SIZE); | |
635 | if ((rp->b_vec = kzalloc(size, GFP_KERNEL)) == NULL) { | |
636 | rc = -ENOMEM; | |
637 | goto err_allocvec; | |
638 | } | |
639 | ||
640 | if ((rc = mon_alloc_buff(rp->b_vec, rp->b_size/CHUNK_SIZE)) < 0) | |
641 | goto err_allocbuff; | |
642 | ||
643 | rp->r.m_bus = mbus; | |
644 | rp->r.r_data = rp; | |
645 | rp->r.rnf_submit = mon_bin_submit; | |
646 | rp->r.rnf_error = mon_bin_error; | |
647 | rp->r.rnf_complete = mon_bin_complete; | |
648 | ||
649 | mon_reader_add(mbus, &rp->r); | |
650 | ||
651 | file->private_data = rp; | |
652 | mutex_unlock(&mon_lock); | |
1af46fd7 | 653 | unlock_kernel(); |
6f23ee1f PZ |
654 | return 0; |
655 | ||
656 | err_allocbuff: | |
657 | kfree(rp->b_vec); | |
658 | err_allocvec: | |
659 | kfree(rp); | |
660 | err_alloc: | |
661 | mutex_unlock(&mon_lock); | |
1af46fd7 | 662 | unlock_kernel(); |
6f23ee1f PZ |
663 | return rc; |
664 | } | |
665 | ||
666 | /* | |
667 | * Extract an event from buffer and copy it to user space. | |
668 | * Wait if there is no event ready. | |
669 | * Returns zero or error. | |
670 | */ | |
671 | static int mon_bin_get_event(struct file *file, struct mon_reader_bin *rp, | |
471c604d PZ |
672 | struct mon_bin_hdr __user *hdr, unsigned int hdrbytes, |
673 | void __user *data, unsigned int nbytes) | |
6f23ee1f PZ |
674 | { |
675 | unsigned long flags; | |
676 | struct mon_bin_hdr *ep; | |
677 | size_t step_len; | |
678 | unsigned int offset; | |
679 | int rc; | |
680 | ||
681 | mutex_lock(&rp->fetch_lock); | |
682 | ||
683 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { | |
684 | mutex_unlock(&rp->fetch_lock); | |
685 | return rc; | |
686 | } | |
687 | ||
688 | ep = MON_OFF2HDR(rp, rp->b_out); | |
689 | ||
471c604d | 690 | if (copy_to_user(hdr, ep, hdrbytes)) { |
6f23ee1f PZ |
691 | mutex_unlock(&rp->fetch_lock); |
692 | return -EFAULT; | |
693 | } | |
694 | ||
695 | step_len = min(ep->len_cap, nbytes); | |
696 | if ((offset = rp->b_out + PKT_SIZE) >= rp->b_size) offset = 0; | |
697 | ||
698 | if (copy_from_buf(rp, offset, data, step_len)) { | |
699 | mutex_unlock(&rp->fetch_lock); | |
700 | return -EFAULT; | |
701 | } | |
702 | ||
703 | spin_lock_irqsave(&rp->b_lock, flags); | |
704 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); | |
705 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
706 | rp->b_read = 0; | |
707 | ||
708 | mutex_unlock(&rp->fetch_lock); | |
709 | return 0; | |
710 | } | |
711 | ||
712 | static int mon_bin_release(struct inode *inode, struct file *file) | |
713 | { | |
714 | struct mon_reader_bin *rp = file->private_data; | |
715 | struct mon_bus* mbus = rp->r.m_bus; | |
716 | ||
717 | mutex_lock(&mon_lock); | |
718 | ||
719 | if (mbus->nreaders <= 0) { | |
720 | printk(KERN_ERR TAG ": consistency error on close\n"); | |
721 | mutex_unlock(&mon_lock); | |
722 | return 0; | |
723 | } | |
724 | mon_reader_del(mbus, &rp->r); | |
725 | ||
726 | mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE); | |
727 | kfree(rp->b_vec); | |
728 | kfree(rp); | |
729 | ||
730 | mutex_unlock(&mon_lock); | |
731 | return 0; | |
732 | } | |
733 | ||
734 | static ssize_t mon_bin_read(struct file *file, char __user *buf, | |
735 | size_t nbytes, loff_t *ppos) | |
736 | { | |
737 | struct mon_reader_bin *rp = file->private_data; | |
471c604d | 738 | unsigned int hdrbytes = PKT_SZ_API0; |
6f23ee1f PZ |
739 | unsigned long flags; |
740 | struct mon_bin_hdr *ep; | |
741 | unsigned int offset; | |
742 | size_t step_len; | |
743 | char *ptr; | |
744 | ssize_t done = 0; | |
745 | int rc; | |
746 | ||
747 | mutex_lock(&rp->fetch_lock); | |
748 | ||
749 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { | |
750 | mutex_unlock(&rp->fetch_lock); | |
751 | return rc; | |
752 | } | |
753 | ||
754 | ep = MON_OFF2HDR(rp, rp->b_out); | |
755 | ||
471c604d PZ |
756 | if (rp->b_read < hdrbytes) { |
757 | step_len = min(nbytes, (size_t)(hdrbytes - rp->b_read)); | |
6f23ee1f PZ |
758 | ptr = ((char *)ep) + rp->b_read; |
759 | if (step_len && copy_to_user(buf, ptr, step_len)) { | |
760 | mutex_unlock(&rp->fetch_lock); | |
761 | return -EFAULT; | |
762 | } | |
763 | nbytes -= step_len; | |
764 | buf += step_len; | |
765 | rp->b_read += step_len; | |
766 | done += step_len; | |
767 | } | |
768 | ||
471c604d | 769 | if (rp->b_read >= hdrbytes) { |
f1c0a2a3 | 770 | step_len = ep->len_cap; |
471c604d | 771 | step_len -= rp->b_read - hdrbytes; |
f1c0a2a3 PZ |
772 | if (step_len > nbytes) |
773 | step_len = nbytes; | |
6f23ee1f | 774 | offset = rp->b_out + PKT_SIZE; |
471c604d | 775 | offset += rp->b_read - hdrbytes; |
6f23ee1f PZ |
776 | if (offset >= rp->b_size) |
777 | offset -= rp->b_size; | |
778 | if (copy_from_buf(rp, offset, buf, step_len)) { | |
779 | mutex_unlock(&rp->fetch_lock); | |
780 | return -EFAULT; | |
781 | } | |
782 | nbytes -= step_len; | |
783 | buf += step_len; | |
784 | rp->b_read += step_len; | |
785 | done += step_len; | |
786 | } | |
787 | ||
788 | /* | |
789 | * Check if whole packet was read, and if so, jump to the next one. | |
790 | */ | |
471c604d | 791 | if (rp->b_read >= hdrbytes + ep->len_cap) { |
6f23ee1f PZ |
792 | spin_lock_irqsave(&rp->b_lock, flags); |
793 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); | |
794 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
795 | rp->b_read = 0; | |
796 | } | |
797 | ||
798 | mutex_unlock(&rp->fetch_lock); | |
799 | return done; | |
800 | } | |
801 | ||
802 | /* | |
803 | * Remove at most nevents from chunked buffer. | |
804 | * Returns the number of removed events. | |
805 | */ | |
806 | static int mon_bin_flush(struct mon_reader_bin *rp, unsigned nevents) | |
807 | { | |
808 | unsigned long flags; | |
809 | struct mon_bin_hdr *ep; | |
810 | int i; | |
811 | ||
812 | mutex_lock(&rp->fetch_lock); | |
813 | spin_lock_irqsave(&rp->b_lock, flags); | |
814 | for (i = 0; i < nevents; ++i) { | |
815 | if (MON_RING_EMPTY(rp)) | |
816 | break; | |
817 | ||
818 | ep = MON_OFF2HDR(rp, rp->b_out); | |
819 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); | |
820 | } | |
821 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
822 | rp->b_read = 0; | |
823 | mutex_unlock(&rp->fetch_lock); | |
824 | return i; | |
825 | } | |
826 | ||
827 | /* | |
828 | * Fetch at most max event offsets into the buffer and put them into vec. | |
829 | * The events are usually freed later with mon_bin_flush. | |
830 | * Return the effective number of events fetched. | |
831 | */ | |
832 | static int mon_bin_fetch(struct file *file, struct mon_reader_bin *rp, | |
833 | u32 __user *vec, unsigned int max) | |
834 | { | |
835 | unsigned int cur_out; | |
836 | unsigned int bytes, avail; | |
837 | unsigned int size; | |
838 | unsigned int nevents; | |
839 | struct mon_bin_hdr *ep; | |
840 | unsigned long flags; | |
841 | int rc; | |
842 | ||
843 | mutex_lock(&rp->fetch_lock); | |
844 | ||
845 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { | |
846 | mutex_unlock(&rp->fetch_lock); | |
847 | return rc; | |
848 | } | |
849 | ||
850 | spin_lock_irqsave(&rp->b_lock, flags); | |
851 | avail = rp->b_cnt; | |
852 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
853 | ||
854 | cur_out = rp->b_out; | |
855 | nevents = 0; | |
856 | bytes = 0; | |
857 | while (bytes < avail) { | |
858 | if (nevents >= max) | |
859 | break; | |
860 | ||
861 | ep = MON_OFF2HDR(rp, cur_out); | |
862 | if (put_user(cur_out, &vec[nevents])) { | |
863 | mutex_unlock(&rp->fetch_lock); | |
864 | return -EFAULT; | |
865 | } | |
866 | ||
867 | nevents++; | |
868 | size = ep->len_cap + PKT_SIZE; | |
869 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
870 | if ((cur_out += size) >= rp->b_size) | |
871 | cur_out -= rp->b_size; | |
872 | bytes += size; | |
873 | } | |
874 | ||
875 | mutex_unlock(&rp->fetch_lock); | |
876 | return nevents; | |
877 | } | |
878 | ||
879 | /* | |
880 | * Count events. This is almost the same as the above mon_bin_fetch, | |
881 | * only we do not store offsets into user vector, and we have no limit. | |
882 | */ | |
883 | static int mon_bin_queued(struct mon_reader_bin *rp) | |
884 | { | |
885 | unsigned int cur_out; | |
886 | unsigned int bytes, avail; | |
887 | unsigned int size; | |
888 | unsigned int nevents; | |
889 | struct mon_bin_hdr *ep; | |
890 | unsigned long flags; | |
891 | ||
892 | mutex_lock(&rp->fetch_lock); | |
893 | ||
894 | spin_lock_irqsave(&rp->b_lock, flags); | |
895 | avail = rp->b_cnt; | |
896 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
897 | ||
898 | cur_out = rp->b_out; | |
899 | nevents = 0; | |
900 | bytes = 0; | |
901 | while (bytes < avail) { | |
902 | ep = MON_OFF2HDR(rp, cur_out); | |
903 | ||
904 | nevents++; | |
905 | size = ep->len_cap + PKT_SIZE; | |
906 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
907 | if ((cur_out += size) >= rp->b_size) | |
908 | cur_out -= rp->b_size; | |
909 | bytes += size; | |
910 | } | |
911 | ||
912 | mutex_unlock(&rp->fetch_lock); | |
913 | return nevents; | |
914 | } | |
915 | ||
916 | /* | |
917 | */ | |
918 | static int mon_bin_ioctl(struct inode *inode, struct file *file, | |
919 | unsigned int cmd, unsigned long arg) | |
920 | { | |
921 | struct mon_reader_bin *rp = file->private_data; | |
922 | // struct mon_bus* mbus = rp->r.m_bus; | |
923 | int ret = 0; | |
924 | struct mon_bin_hdr *ep; | |
925 | unsigned long flags; | |
926 | ||
927 | switch (cmd) { | |
928 | ||
929 | case MON_IOCQ_URB_LEN: | |
930 | /* | |
931 | * N.B. This only returns the size of data, without the header. | |
932 | */ | |
933 | spin_lock_irqsave(&rp->b_lock, flags); | |
934 | if (!MON_RING_EMPTY(rp)) { | |
935 | ep = MON_OFF2HDR(rp, rp->b_out); | |
936 | ret = ep->len_cap; | |
937 | } | |
938 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
939 | break; | |
940 | ||
941 | case MON_IOCQ_RING_SIZE: | |
942 | ret = rp->b_size; | |
943 | break; | |
944 | ||
945 | case MON_IOCT_RING_SIZE: | |
946 | /* | |
947 | * Changing the buffer size will flush it's contents; the new | |
948 | * buffer is allocated before releasing the old one to be sure | |
949 | * the device will stay functional also in case of memory | |
950 | * pressure. | |
951 | */ | |
952 | { | |
953 | int size; | |
954 | struct mon_pgmap *vec; | |
955 | ||
956 | if (arg < BUFF_MIN || arg > BUFF_MAX) | |
957 | return -EINVAL; | |
958 | ||
959 | size = CHUNK_ALIGN(arg); | |
960 | if ((vec = kzalloc(sizeof(struct mon_pgmap) * (size/CHUNK_SIZE), | |
961 | GFP_KERNEL)) == NULL) { | |
962 | ret = -ENOMEM; | |
963 | break; | |
964 | } | |
965 | ||
966 | ret = mon_alloc_buff(vec, size/CHUNK_SIZE); | |
967 | if (ret < 0) { | |
968 | kfree(vec); | |
969 | break; | |
970 | } | |
971 | ||
972 | mutex_lock(&rp->fetch_lock); | |
973 | spin_lock_irqsave(&rp->b_lock, flags); | |
974 | mon_free_buff(rp->b_vec, size/CHUNK_SIZE); | |
975 | kfree(rp->b_vec); | |
976 | rp->b_vec = vec; | |
977 | rp->b_size = size; | |
978 | rp->b_read = rp->b_in = rp->b_out = rp->b_cnt = 0; | |
979 | rp->cnt_lost = 0; | |
980 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
981 | mutex_unlock(&rp->fetch_lock); | |
982 | } | |
983 | break; | |
984 | ||
985 | case MON_IOCH_MFLUSH: | |
986 | ret = mon_bin_flush(rp, arg); | |
987 | break; | |
988 | ||
989 | case MON_IOCX_GET: | |
471c604d | 990 | case MON_IOCX_GETX: |
6f23ee1f PZ |
991 | { |
992 | struct mon_bin_get getb; | |
993 | ||
994 | if (copy_from_user(&getb, (void __user *)arg, | |
995 | sizeof(struct mon_bin_get))) | |
996 | return -EFAULT; | |
997 | ||
998 | if (getb.alloc > 0x10000000) /* Want to cast to u32 */ | |
999 | return -EINVAL; | |
471c604d PZ |
1000 | ret = mon_bin_get_event(file, rp, getb.hdr, |
1001 | (cmd == MON_IOCX_GET)? PKT_SZ_API0: PKT_SZ_API1, | |
1002 | getb.data, (unsigned int)getb.alloc); | |
6f23ee1f PZ |
1003 | } |
1004 | break; | |
1005 | ||
6f23ee1f PZ |
1006 | case MON_IOCX_MFETCH: |
1007 | { | |
1008 | struct mon_bin_mfetch mfetch; | |
1009 | struct mon_bin_mfetch __user *uptr; | |
1010 | ||
1011 | uptr = (struct mon_bin_mfetch __user *)arg; | |
1012 | ||
1013 | if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) | |
1014 | return -EFAULT; | |
1015 | ||
1016 | if (mfetch.nflush) { | |
1017 | ret = mon_bin_flush(rp, mfetch.nflush); | |
1018 | if (ret < 0) | |
1019 | return ret; | |
1020 | if (put_user(ret, &uptr->nflush)) | |
1021 | return -EFAULT; | |
1022 | } | |
1023 | ret = mon_bin_fetch(file, rp, mfetch.offvec, mfetch.nfetch); | |
1024 | if (ret < 0) | |
1025 | return ret; | |
1026 | if (put_user(ret, &uptr->nfetch)) | |
1027 | return -EFAULT; | |
1028 | ret = 0; | |
1029 | } | |
1030 | break; | |
1031 | ||
7abce6be PZ |
1032 | case MON_IOCG_STATS: { |
1033 | struct mon_bin_stats __user *sp; | |
1034 | unsigned int nevents; | |
1035 | unsigned int ndropped; | |
1036 | ||
1037 | spin_lock_irqsave(&rp->b_lock, flags); | |
1038 | ndropped = rp->cnt_lost; | |
1039 | rp->cnt_lost = 0; | |
1040 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
1041 | nevents = mon_bin_queued(rp); | |
1042 | ||
1043 | sp = (struct mon_bin_stats __user *)arg; | |
1044 | if (put_user(rp->cnt_lost, &sp->dropped)) | |
1045 | return -EFAULT; | |
1046 | if (put_user(nevents, &sp->queued)) | |
1047 | return -EFAULT; | |
1048 | ||
1049 | } | |
1050 | break; | |
1051 | ||
1052 | default: | |
1053 | return -ENOTTY; | |
1054 | } | |
1055 | ||
1056 | return ret; | |
1057 | } | |
1058 | ||
6f23ee1f | 1059 | #ifdef CONFIG_COMPAT |
7abce6be PZ |
1060 | static long mon_bin_compat_ioctl(struct file *file, |
1061 | unsigned int cmd, unsigned long arg) | |
1062 | { | |
1063 | struct mon_reader_bin *rp = file->private_data; | |
1064 | int ret; | |
1065 | ||
1066 | switch (cmd) { | |
1067 | ||
471c604d PZ |
1068 | case MON_IOCX_GET32: |
1069 | case MON_IOCX_GETX32: | |
1070 | { | |
7abce6be PZ |
1071 | struct mon_bin_get32 getb; |
1072 | ||
1073 | if (copy_from_user(&getb, (void __user *)arg, | |
1074 | sizeof(struct mon_bin_get32))) | |
1075 | return -EFAULT; | |
1076 | ||
471c604d PZ |
1077 | ret = mon_bin_get_event(file, rp, compat_ptr(getb.hdr32), |
1078 | (cmd == MON_IOCX_GET32)? PKT_SZ_API0: PKT_SZ_API1, | |
1079 | compat_ptr(getb.data32), getb.alloc32); | |
7abce6be PZ |
1080 | if (ret < 0) |
1081 | return ret; | |
1082 | } | |
1083 | return 0; | |
1084 | ||
6f23ee1f PZ |
1085 | case MON_IOCX_MFETCH32: |
1086 | { | |
1087 | struct mon_bin_mfetch32 mfetch; | |
1088 | struct mon_bin_mfetch32 __user *uptr; | |
1089 | ||
1090 | uptr = (struct mon_bin_mfetch32 __user *) compat_ptr(arg); | |
1091 | ||
1092 | if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) | |
1093 | return -EFAULT; | |
1094 | ||
1095 | if (mfetch.nflush32) { | |
1096 | ret = mon_bin_flush(rp, mfetch.nflush32); | |
1097 | if (ret < 0) | |
1098 | return ret; | |
1099 | if (put_user(ret, &uptr->nflush32)) | |
1100 | return -EFAULT; | |
1101 | } | |
1102 | ret = mon_bin_fetch(file, rp, compat_ptr(mfetch.offvec32), | |
1103 | mfetch.nfetch32); | |
1104 | if (ret < 0) | |
1105 | return ret; | |
1106 | if (put_user(ret, &uptr->nfetch32)) | |
1107 | return -EFAULT; | |
6f23ee1f | 1108 | } |
7abce6be | 1109 | return 0; |
6f23ee1f | 1110 | |
7abce6be PZ |
1111 | case MON_IOCG_STATS: |
1112 | return mon_bin_ioctl(NULL, file, cmd, | |
1113 | (unsigned long) compat_ptr(arg)); | |
6f23ee1f | 1114 | |
7abce6be PZ |
1115 | case MON_IOCQ_URB_LEN: |
1116 | case MON_IOCQ_RING_SIZE: | |
1117 | case MON_IOCT_RING_SIZE: | |
1118 | case MON_IOCH_MFLUSH: | |
1119 | return mon_bin_ioctl(NULL, file, cmd, arg); | |
6f23ee1f PZ |
1120 | |
1121 | default: | |
7abce6be | 1122 | ; |
6f23ee1f | 1123 | } |
7abce6be | 1124 | return -ENOTTY; |
6f23ee1f | 1125 | } |
7abce6be | 1126 | #endif /* CONFIG_COMPAT */ |
6f23ee1f PZ |
1127 | |
1128 | static unsigned int | |
1129 | mon_bin_poll(struct file *file, struct poll_table_struct *wait) | |
1130 | { | |
1131 | struct mon_reader_bin *rp = file->private_data; | |
1132 | unsigned int mask = 0; | |
1133 | unsigned long flags; | |
1134 | ||
1135 | if (file->f_mode & FMODE_READ) | |
1136 | poll_wait(file, &rp->b_wait, wait); | |
1137 | ||
1138 | spin_lock_irqsave(&rp->b_lock, flags); | |
1139 | if (!MON_RING_EMPTY(rp)) | |
1140 | mask |= POLLIN | POLLRDNORM; /* readable */ | |
1141 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
1142 | return mask; | |
1143 | } | |
1144 | ||
1145 | /* | |
1146 | * open and close: just keep track of how many times the device is | |
1147 | * mapped, to use the proper memory allocation function. | |
1148 | */ | |
1149 | static void mon_bin_vma_open(struct vm_area_struct *vma) | |
1150 | { | |
1151 | struct mon_reader_bin *rp = vma->vm_private_data; | |
1152 | rp->mmap_active++; | |
1153 | } | |
1154 | ||
1155 | static void mon_bin_vma_close(struct vm_area_struct *vma) | |
1156 | { | |
1157 | struct mon_reader_bin *rp = vma->vm_private_data; | |
1158 | rp->mmap_active--; | |
1159 | } | |
1160 | ||
1161 | /* | |
1162 | * Map ring pages to user space. | |
1163 | */ | |
041509db | 1164 | static int mon_bin_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
6f23ee1f PZ |
1165 | { |
1166 | struct mon_reader_bin *rp = vma->vm_private_data; | |
1167 | unsigned long offset, chunk_idx; | |
1168 | struct page *pageptr; | |
1169 | ||
041509db | 1170 | offset = vmf->pgoff << PAGE_SHIFT; |
6f23ee1f | 1171 | if (offset >= rp->b_size) |
041509db | 1172 | return VM_FAULT_SIGBUS; |
6f23ee1f PZ |
1173 | chunk_idx = offset / CHUNK_SIZE; |
1174 | pageptr = rp->b_vec[chunk_idx].pg; | |
1175 | get_page(pageptr); | |
041509db NP |
1176 | vmf->page = pageptr; |
1177 | return 0; | |
6f23ee1f PZ |
1178 | } |
1179 | ||
f0f37e2f | 1180 | static const struct vm_operations_struct mon_bin_vm_ops = { |
6f23ee1f PZ |
1181 | .open = mon_bin_vma_open, |
1182 | .close = mon_bin_vma_close, | |
041509db | 1183 | .fault = mon_bin_vma_fault, |
6f23ee1f PZ |
1184 | }; |
1185 | ||
454459b0 | 1186 | static int mon_bin_mmap(struct file *filp, struct vm_area_struct *vma) |
6f23ee1f | 1187 | { |
041509db | 1188 | /* don't do anything here: "fault" will set up page table entries */ |
6f23ee1f PZ |
1189 | vma->vm_ops = &mon_bin_vm_ops; |
1190 | vma->vm_flags |= VM_RESERVED; | |
1191 | vma->vm_private_data = filp->private_data; | |
1192 | mon_bin_vma_open(vma); | |
1193 | return 0; | |
1194 | } | |
1195 | ||
0b3f5fe6 | 1196 | static const struct file_operations mon_fops_binary = { |
6f23ee1f PZ |
1197 | .owner = THIS_MODULE, |
1198 | .open = mon_bin_open, | |
1199 | .llseek = no_llseek, | |
1200 | .read = mon_bin_read, | |
1201 | /* .write = mon_text_write, */ | |
1202 | .poll = mon_bin_poll, | |
1203 | .ioctl = mon_bin_ioctl, | |
7abce6be PZ |
1204 | #ifdef CONFIG_COMPAT |
1205 | .compat_ioctl = mon_bin_compat_ioctl, | |
1206 | #endif | |
6f23ee1f | 1207 | .release = mon_bin_release, |
454459b0 | 1208 | .mmap = mon_bin_mmap, |
6f23ee1f PZ |
1209 | }; |
1210 | ||
1211 | static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp) | |
1212 | { | |
1213 | DECLARE_WAITQUEUE(waita, current); | |
1214 | unsigned long flags; | |
1215 | ||
1216 | add_wait_queue(&rp->b_wait, &waita); | |
1217 | set_current_state(TASK_INTERRUPTIBLE); | |
1218 | ||
1219 | spin_lock_irqsave(&rp->b_lock, flags); | |
1220 | while (MON_RING_EMPTY(rp)) { | |
1221 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
1222 | ||
1223 | if (file->f_flags & O_NONBLOCK) { | |
1224 | set_current_state(TASK_RUNNING); | |
1225 | remove_wait_queue(&rp->b_wait, &waita); | |
1226 | return -EWOULDBLOCK; /* Same as EAGAIN in Linux */ | |
1227 | } | |
1228 | schedule(); | |
1229 | if (signal_pending(current)) { | |
1230 | remove_wait_queue(&rp->b_wait, &waita); | |
1231 | return -EINTR; | |
1232 | } | |
1233 | set_current_state(TASK_INTERRUPTIBLE); | |
1234 | ||
1235 | spin_lock_irqsave(&rp->b_lock, flags); | |
1236 | } | |
1237 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
1238 | ||
1239 | set_current_state(TASK_RUNNING); | |
1240 | remove_wait_queue(&rp->b_wait, &waita); | |
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | static int mon_alloc_buff(struct mon_pgmap *map, int npages) | |
1245 | { | |
1246 | int n; | |
1247 | unsigned long vaddr; | |
1248 | ||
1249 | for (n = 0; n < npages; n++) { | |
1250 | vaddr = get_zeroed_page(GFP_KERNEL); | |
1251 | if (vaddr == 0) { | |
1252 | while (n-- != 0) | |
1253 | free_page((unsigned long) map[n].ptr); | |
1254 | return -ENOMEM; | |
1255 | } | |
1256 | map[n].ptr = (unsigned char *) vaddr; | |
5bfd7560 | 1257 | map[n].pg = virt_to_page((void *) vaddr); |
6f23ee1f PZ |
1258 | } |
1259 | return 0; | |
1260 | } | |
1261 | ||
1262 | static void mon_free_buff(struct mon_pgmap *map, int npages) | |
1263 | { | |
1264 | int n; | |
1265 | ||
1266 | for (n = 0; n < npages; n++) | |
1267 | free_page((unsigned long) map[n].ptr); | |
1268 | } | |
1269 | ||
ce7cd137 PZ |
1270 | int mon_bin_add(struct mon_bus *mbus, const struct usb_bus *ubus) |
1271 | { | |
1272 | struct device *dev; | |
1273 | unsigned minor = ubus? ubus->busnum: 0; | |
1274 | ||
1275 | if (minor >= MON_BIN_MAX_MINOR) | |
1276 | return 0; | |
1277 | ||
b0b090e5 GKH |
1278 | dev = device_create(mon_bin_class, ubus ? ubus->controller : NULL, |
1279 | MKDEV(MAJOR(mon_bin_dev0), minor), NULL, | |
1280 | "usbmon%d", minor); | |
ce7cd137 PZ |
1281 | if (IS_ERR(dev)) |
1282 | return 0; | |
1283 | ||
1284 | mbus->classdev = dev; | |
1285 | return 1; | |
1286 | } | |
1287 | ||
1288 | void mon_bin_del(struct mon_bus *mbus) | |
1289 | { | |
1290 | device_destroy(mon_bin_class, mbus->classdev->devt); | |
1291 | } | |
1292 | ||
6f23ee1f PZ |
1293 | int __init mon_bin_init(void) |
1294 | { | |
1295 | int rc; | |
1296 | ||
ce7cd137 PZ |
1297 | mon_bin_class = class_create(THIS_MODULE, "usbmon"); |
1298 | if (IS_ERR(mon_bin_class)) { | |
1299 | rc = PTR_ERR(mon_bin_class); | |
1300 | goto err_class; | |
1301 | } | |
1302 | ||
6f23ee1f PZ |
1303 | rc = alloc_chrdev_region(&mon_bin_dev0, 0, MON_BIN_MAX_MINOR, "usbmon"); |
1304 | if (rc < 0) | |
1305 | goto err_dev; | |
1306 | ||
1307 | cdev_init(&mon_bin_cdev, &mon_fops_binary); | |
1308 | mon_bin_cdev.owner = THIS_MODULE; | |
1309 | ||
1310 | rc = cdev_add(&mon_bin_cdev, mon_bin_dev0, MON_BIN_MAX_MINOR); | |
1311 | if (rc < 0) | |
1312 | goto err_add; | |
1313 | ||
1314 | return 0; | |
1315 | ||
1316 | err_add: | |
1317 | unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); | |
1318 | err_dev: | |
ce7cd137 PZ |
1319 | class_destroy(mon_bin_class); |
1320 | err_class: | |
6f23ee1f PZ |
1321 | return rc; |
1322 | } | |
1323 | ||
21641e3f | 1324 | void mon_bin_exit(void) |
6f23ee1f PZ |
1325 | { |
1326 | cdev_del(&mon_bin_cdev); | |
1327 | unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); | |
ce7cd137 | 1328 | class_destroy(mon_bin_class); |
6f23ee1f | 1329 | } |