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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> | |
b375e116 | 18 | #include <linux/scatterlist.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
6f23ee1f PZ |
20 | |
21 | #include <asm/uaccess.h> | |
22 | ||
23 | #include "usb_mon.h" | |
24 | ||
25 | /* | |
26 | * Defined by USB 2.0 clause 9.3, table 9.2. | |
27 | */ | |
28 | #define SETUP_LEN 8 | |
29 | ||
30 | /* ioctl macros */ | |
31 | #define MON_IOC_MAGIC 0x92 | |
32 | ||
33 | #define MON_IOCQ_URB_LEN _IO(MON_IOC_MAGIC, 1) | |
34 | /* #2 used to be MON_IOCX_URB, removed before it got into Linus tree */ | |
35 | #define MON_IOCG_STATS _IOR(MON_IOC_MAGIC, 3, struct mon_bin_stats) | |
36 | #define MON_IOCT_RING_SIZE _IO(MON_IOC_MAGIC, 4) | |
37 | #define MON_IOCQ_RING_SIZE _IO(MON_IOC_MAGIC, 5) | |
38 | #define MON_IOCX_GET _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get) | |
39 | #define MON_IOCX_MFETCH _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch) | |
40 | #define MON_IOCH_MFLUSH _IO(MON_IOC_MAGIC, 8) | |
471c604d PZ |
41 | /* #9 was MON_IOCT_SETAPI */ |
42 | #define MON_IOCX_GETX _IOW(MON_IOC_MAGIC, 10, struct mon_bin_get) | |
7abce6be | 43 | |
6f23ee1f PZ |
44 | #ifdef CONFIG_COMPAT |
45 | #define MON_IOCX_GET32 _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get32) | |
46 | #define MON_IOCX_MFETCH32 _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch32) | |
471c604d | 47 | #define MON_IOCX_GETX32 _IOW(MON_IOC_MAGIC, 10, struct mon_bin_get32) |
6f23ee1f PZ |
48 | #endif |
49 | ||
50 | /* | |
51 | * Some architectures have enormous basic pages (16KB for ia64, 64KB for ppc). | |
52 | * But it's all right. Just use a simple way to make sure the chunk is never | |
53 | * smaller than a page. | |
54 | * | |
55 | * N.B. An application does not know our chunk size. | |
56 | * | |
57 | * Woops, get_zeroed_page() returns a single page. I guess we're stuck with | |
58 | * page-sized chunks for the time being. | |
59 | */ | |
60 | #define CHUNK_SIZE PAGE_SIZE | |
61 | #define CHUNK_ALIGN(x) (((x)+CHUNK_SIZE-1) & ~(CHUNK_SIZE-1)) | |
62 | ||
63 | /* | |
64 | * The magic limit was calculated so that it allows the monitoring | |
65 | * application to pick data once in two ticks. This way, another application, | |
66 | * which presumably drives the bus, gets to hog CPU, yet we collect our data. | |
67 | * If HZ is 100, a 480 mbit/s bus drives 614 KB every jiffy. USB has an | |
68 | * enormous overhead built into the bus protocol, so we need about 1000 KB. | |
69 | * | |
70 | * This is still too much for most cases, where we just snoop a few | |
71 | * descriptor fetches for enumeration. So, the default is a "reasonable" | |
72 | * amount for systems with HZ=250 and incomplete bus saturation. | |
73 | * | |
74 | * XXX What about multi-megabyte URBs which take minutes to transfer? | |
75 | */ | |
76 | #define BUFF_MAX CHUNK_ALIGN(1200*1024) | |
77 | #define BUFF_DFL CHUNK_ALIGN(300*1024) | |
78 | #define BUFF_MIN CHUNK_ALIGN(8*1024) | |
79 | ||
80 | /* | |
81 | * The per-event API header (2 per URB). | |
82 | * | |
83 | * This structure is seen in userland as defined by the documentation. | |
84 | */ | |
85 | struct mon_bin_hdr { | |
86 | u64 id; /* URB ID - from submission to callback */ | |
87 | unsigned char type; /* Same as in text API; extensible. */ | |
88 | unsigned char xfer_type; /* ISO, Intr, Control, Bulk */ | |
89 | unsigned char epnum; /* Endpoint number and transfer direction */ | |
90 | unsigned char devnum; /* Device address */ | |
91 | unsigned short busnum; /* Bus number */ | |
92 | char flag_setup; | |
93 | char flag_data; | |
94 | s64 ts_sec; /* gettimeofday */ | |
95 | s32 ts_usec; /* gettimeofday */ | |
96 | int status; | |
97 | unsigned int len_urb; /* Length of data (submitted or actual) */ | |
98 | unsigned int len_cap; /* Delivered length */ | |
471c604d PZ |
99 | union { |
100 | unsigned char setup[SETUP_LEN]; /* Only for Control S-type */ | |
101 | struct iso_rec { | |
102 | int error_count; | |
103 | int numdesc; | |
104 | } iso; | |
105 | } s; | |
106 | int interval; | |
107 | int start_frame; | |
108 | unsigned int xfer_flags; | |
109 | unsigned int ndesc; /* Actual number of ISO descriptors */ | |
110 | }; | |
111 | ||
112 | /* | |
113 | * ISO vector, packed into the head of data stream. | |
114 | * This has to take 16 bytes to make sure that the end of buffer | |
115 | * wrap is not happening in the middle of a descriptor. | |
116 | */ | |
117 | struct mon_bin_isodesc { | |
118 | int iso_status; | |
119 | unsigned int iso_off; | |
120 | unsigned int iso_len; | |
121 | u32 _pad; | |
6f23ee1f PZ |
122 | }; |
123 | ||
124 | /* per file statistic */ | |
125 | struct mon_bin_stats { | |
126 | u32 queued; | |
127 | u32 dropped; | |
128 | }; | |
129 | ||
130 | struct mon_bin_get { | |
471c604d | 131 | struct mon_bin_hdr __user *hdr; /* Can be 48 bytes or 64. */ |
6f23ee1f PZ |
132 | void __user *data; |
133 | size_t alloc; /* Length of data (can be zero) */ | |
134 | }; | |
135 | ||
136 | struct mon_bin_mfetch { | |
137 | u32 __user *offvec; /* Vector of events fetched */ | |
138 | u32 nfetch; /* Number of events to fetch (out: fetched) */ | |
139 | u32 nflush; /* Number of events to flush */ | |
140 | }; | |
141 | ||
142 | #ifdef CONFIG_COMPAT | |
143 | struct mon_bin_get32 { | |
144 | u32 hdr32; | |
145 | u32 data32; | |
146 | u32 alloc32; | |
147 | }; | |
148 | ||
149 | struct mon_bin_mfetch32 { | |
150 | u32 offvec32; | |
151 | u32 nfetch32; | |
152 | u32 nflush32; | |
153 | }; | |
154 | #endif | |
155 | ||
156 | /* Having these two values same prevents wrapping of the mon_bin_hdr */ | |
157 | #define PKT_ALIGN 64 | |
158 | #define PKT_SIZE 64 | |
159 | ||
471c604d PZ |
160 | #define PKT_SZ_API0 48 /* API 0 (2.6.20) size */ |
161 | #define PKT_SZ_API1 64 /* API 1 size: extra fields */ | |
162 | ||
163 | #define ISODESC_MAX 128 /* Same number as usbfs allows, 2048 bytes. */ | |
164 | ||
6f23ee1f PZ |
165 | /* max number of USB bus supported */ |
166 | #define MON_BIN_MAX_MINOR 128 | |
167 | ||
168 | /* | |
169 | * The buffer: map of used pages. | |
170 | */ | |
171 | struct mon_pgmap { | |
172 | struct page *pg; | |
173 | unsigned char *ptr; /* XXX just use page_to_virt everywhere? */ | |
174 | }; | |
175 | ||
176 | /* | |
177 | * This gets associated with an open file struct. | |
178 | */ | |
179 | struct mon_reader_bin { | |
180 | /* The buffer: one per open. */ | |
181 | spinlock_t b_lock; /* Protect b_cnt, b_in */ | |
182 | unsigned int b_size; /* Current size of the buffer - bytes */ | |
183 | unsigned int b_cnt; /* Bytes used */ | |
184 | unsigned int b_in, b_out; /* Offsets into buffer - bytes */ | |
185 | unsigned int b_read; /* Amount of read data in curr. pkt. */ | |
186 | struct mon_pgmap *b_vec; /* The map array */ | |
187 | wait_queue_head_t b_wait; /* Wait for data here */ | |
188 | ||
189 | struct mutex fetch_lock; /* Protect b_read, b_out */ | |
190 | int mmap_active; | |
191 | ||
192 | /* A list of these is needed for "bus 0". Some time later. */ | |
193 | struct mon_reader r; | |
194 | ||
195 | /* Stats */ | |
196 | unsigned int cnt_lost; | |
197 | }; | |
198 | ||
199 | static inline struct mon_bin_hdr *MON_OFF2HDR(const struct mon_reader_bin *rp, | |
200 | unsigned int offset) | |
201 | { | |
202 | return (struct mon_bin_hdr *) | |
203 | (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE); | |
204 | } | |
205 | ||
206 | #define MON_RING_EMPTY(rp) ((rp)->b_cnt == 0) | |
207 | ||
30c7431d PZ |
208 | static unsigned char xfer_to_pipe[4] = { |
209 | PIPE_CONTROL, PIPE_ISOCHRONOUS, PIPE_BULK, PIPE_INTERRUPT | |
210 | }; | |
211 | ||
ce7cd137 | 212 | static struct class *mon_bin_class; |
6f23ee1f PZ |
213 | static dev_t mon_bin_dev0; |
214 | static struct cdev mon_bin_cdev; | |
215 | ||
216 | static void mon_buff_area_fill(const struct mon_reader_bin *rp, | |
217 | unsigned int offset, unsigned int size); | |
218 | static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp); | |
219 | static int mon_alloc_buff(struct mon_pgmap *map, int npages); | |
220 | static void mon_free_buff(struct mon_pgmap *map, int npages); | |
221 | ||
222 | /* | |
223 | * This is a "chunked memcpy". It does not manipulate any counters. | |
6f23ee1f | 224 | */ |
b375e116 | 225 | static unsigned int mon_copy_to_buff(const struct mon_reader_bin *this, |
6f23ee1f PZ |
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 | } | |
b375e116 | 250 | return off; |
6f23ee1f PZ |
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. | |
fca94748 | 353 | * This is used if a data fetch fails. |
6f23ee1f PZ |
354 | */ |
355 | static void mon_buff_area_shrink(struct mon_reader_bin *rp, unsigned int size) | |
356 | { | |
357 | ||
fca94748 | 358 | /* size &= ~(PKT_ALIGN-1); -- we're called with aligned size */ |
6f23ee1f PZ |
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 | ||
b375e116 AS |
399 | static unsigned int mon_bin_get_data(const struct mon_reader_bin *rp, |
400 | unsigned int offset, struct urb *urb, unsigned int length, | |
401 | char *flag) | |
6f23ee1f | 402 | { |
b375e116 AS |
403 | int i; |
404 | struct scatterlist *sg; | |
405 | unsigned int this_len; | |
406 | ||
407 | *flag = 0; | |
408 | if (urb->num_sgs == 0) { | |
409 | if (urb->transfer_buffer == NULL) { | |
410 | *flag = 'Z'; | |
411 | return length; | |
412 | } | |
413 | mon_copy_to_buff(rp, offset, urb->transfer_buffer, length); | |
414 | length = 0; | |
6f23ee1f | 415 | |
b375e116 AS |
416 | } else { |
417 | /* If IOMMU coalescing occurred, we cannot trust sg_page */ | |
ff9c895f | 418 | if (urb->transfer_flags & URB_DMA_SG_COMBINED) { |
b375e116 AS |
419 | *flag = 'D'; |
420 | return length; | |
421 | } | |
422 | ||
423 | /* Copy up to the first non-addressable segment */ | |
910f8d0c | 424 | for_each_sg(urb->sg, sg, urb->num_sgs, i) { |
b375e116 AS |
425 | if (length == 0 || PageHighMem(sg_page(sg))) |
426 | break; | |
427 | this_len = min_t(unsigned int, sg->length, length); | |
428 | offset = mon_copy_to_buff(rp, offset, sg_virt(sg), | |
429 | this_len); | |
430 | length -= this_len; | |
431 | } | |
432 | if (i == 0) | |
433 | *flag = 'D'; | |
434 | } | |
435 | ||
436 | return length; | |
6f23ee1f PZ |
437 | } |
438 | ||
b17ea167 PZ |
439 | /* |
440 | * This is the look-ahead pass in case of 'C Zi', when actual_length cannot | |
441 | * be used to determine the length of the whole contiguous buffer. | |
442 | */ | |
443 | static unsigned int mon_bin_collate_isodesc(const struct mon_reader_bin *rp, | |
444 | struct urb *urb, unsigned int ndesc) | |
445 | { | |
446 | struct usb_iso_packet_descriptor *fp; | |
447 | unsigned int length; | |
448 | ||
449 | length = 0; | |
450 | fp = urb->iso_frame_desc; | |
451 | while (ndesc-- != 0) { | |
452 | if (fp->actual_length != 0) { | |
453 | if (fp->offset + fp->actual_length > length) | |
454 | length = fp->offset + fp->actual_length; | |
455 | } | |
456 | fp++; | |
457 | } | |
458 | return length; | |
459 | } | |
460 | ||
471c604d PZ |
461 | static void mon_bin_get_isodesc(const struct mon_reader_bin *rp, |
462 | unsigned int offset, struct urb *urb, char ev_type, unsigned int ndesc) | |
463 | { | |
464 | struct mon_bin_isodesc *dp; | |
465 | struct usb_iso_packet_descriptor *fp; | |
466 | ||
467 | fp = urb->iso_frame_desc; | |
468 | while (ndesc-- != 0) { | |
469 | dp = (struct mon_bin_isodesc *) | |
470 | (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE); | |
471 | dp->iso_status = fp->status; | |
472 | dp->iso_off = fp->offset; | |
473 | dp->iso_len = (ev_type == 'S') ? fp->length : fp->actual_length; | |
474 | dp->_pad = 0; | |
475 | if ((offset += sizeof(struct mon_bin_isodesc)) >= rp->b_size) | |
476 | offset = 0; | |
477 | fp++; | |
478 | } | |
479 | } | |
480 | ||
6f23ee1f | 481 | static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb, |
9347d51c | 482 | char ev_type, int status) |
6f23ee1f | 483 | { |
30c7431d | 484 | const struct usb_endpoint_descriptor *epd = &urb->ep->desc; |
6f23ee1f | 485 | struct timeval ts; |
2bc0d109 | 486 | unsigned long flags; |
6f23ee1f PZ |
487 | unsigned int urb_length; |
488 | unsigned int offset; | |
489 | unsigned int length; | |
fca94748 | 490 | unsigned int delta; |
471c604d | 491 | unsigned int ndesc, lendesc; |
30c7431d | 492 | unsigned char dir; |
6f23ee1f PZ |
493 | struct mon_bin_hdr *ep; |
494 | char data_tag = 0; | |
495 | ||
496 | do_gettimeofday(&ts); | |
497 | ||
498 | spin_lock_irqsave(&rp->b_lock, flags); | |
499 | ||
500 | /* | |
501 | * Find the maximum allowable length, then allocate space. | |
502 | */ | |
b17ea167 PZ |
503 | urb_length = (ev_type == 'S') ? |
504 | urb->transfer_buffer_length : urb->actual_length; | |
505 | length = urb_length; | |
506 | ||
471c604d PZ |
507 | if (usb_endpoint_xfer_isoc(epd)) { |
508 | if (urb->number_of_packets < 0) { | |
509 | ndesc = 0; | |
510 | } else if (urb->number_of_packets >= ISODESC_MAX) { | |
511 | ndesc = ISODESC_MAX; | |
512 | } else { | |
513 | ndesc = urb->number_of_packets; | |
514 | } | |
b17ea167 PZ |
515 | if (ev_type == 'C' && usb_urb_dir_in(urb)) |
516 | length = mon_bin_collate_isodesc(rp, urb, ndesc); | |
471c604d PZ |
517 | } else { |
518 | ndesc = 0; | |
519 | } | |
520 | lendesc = ndesc*sizeof(struct mon_bin_isodesc); | |
521 | ||
b17ea167 PZ |
522 | /* not an issue unless there's a subtle bug in a HCD somewhere */ |
523 | if (length >= urb->transfer_buffer_length) | |
524 | length = urb->transfer_buffer_length; | |
6f23ee1f PZ |
525 | |
526 | if (length >= rp->b_size/5) | |
527 | length = rp->b_size/5; | |
528 | ||
18ea5d00 | 529 | if (usb_urb_dir_in(urb)) { |
6f23ee1f PZ |
530 | if (ev_type == 'S') { |
531 | length = 0; | |
532 | data_tag = '<'; | |
533 | } | |
30c7431d PZ |
534 | /* Cannot rely on endpoint number in case of control ep.0 */ |
535 | dir = USB_DIR_IN; | |
6f23ee1f PZ |
536 | } else { |
537 | if (ev_type == 'C') { | |
538 | length = 0; | |
539 | data_tag = '>'; | |
540 | } | |
30c7431d | 541 | dir = 0; |
6f23ee1f PZ |
542 | } |
543 | ||
471c604d PZ |
544 | if (rp->mmap_active) { |
545 | offset = mon_buff_area_alloc_contiguous(rp, | |
546 | length + PKT_SIZE + lendesc); | |
547 | } else { | |
548 | offset = mon_buff_area_alloc(rp, length + PKT_SIZE + lendesc); | |
549 | } | |
6f23ee1f PZ |
550 | if (offset == ~0) { |
551 | rp->cnt_lost++; | |
552 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
553 | return; | |
554 | } | |
555 | ||
556 | ep = MON_OFF2HDR(rp, offset); | |
557 | if ((offset += PKT_SIZE) >= rp->b_size) offset = 0; | |
558 | ||
559 | /* | |
560 | * Fill the allocated area. | |
561 | */ | |
562 | memset(ep, 0, PKT_SIZE); | |
563 | ep->type = ev_type; | |
30c7431d PZ |
564 | ep->xfer_type = xfer_to_pipe[usb_endpoint_type(epd)]; |
565 | ep->epnum = dir | usb_endpoint_num(epd); | |
18ea5d00 | 566 | ep->devnum = urb->dev->devnum; |
ecb658d3 | 567 | ep->busnum = urb->dev->bus->busnum; |
6f23ee1f PZ |
568 | ep->id = (unsigned long) urb; |
569 | ep->ts_sec = ts.tv_sec; | |
570 | ep->ts_usec = ts.tv_usec; | |
9347d51c | 571 | ep->status = status; |
6f23ee1f | 572 | ep->len_urb = urb_length; |
471c604d PZ |
573 | ep->len_cap = length + lendesc; |
574 | ep->xfer_flags = urb->transfer_flags; | |
575 | ||
576 | if (usb_endpoint_xfer_int(epd)) { | |
577 | ep->interval = urb->interval; | |
578 | } else if (usb_endpoint_xfer_isoc(epd)) { | |
579 | ep->interval = urb->interval; | |
580 | ep->start_frame = urb->start_frame; | |
581 | ep->s.iso.error_count = urb->error_count; | |
582 | ep->s.iso.numdesc = urb->number_of_packets; | |
583 | } | |
584 | ||
585 | if (usb_endpoint_xfer_control(epd) && ev_type == 'S') { | |
586 | ep->flag_setup = mon_bin_get_setup(ep->s.setup, urb, ev_type); | |
587 | } else { | |
588 | ep->flag_setup = '-'; | |
589 | } | |
590 | ||
591 | if (ndesc != 0) { | |
592 | ep->ndesc = ndesc; | |
593 | mon_bin_get_isodesc(rp, offset, urb, ev_type, ndesc); | |
594 | if ((offset += lendesc) >= rp->b_size) | |
595 | offset -= rp->b_size; | |
596 | } | |
6f23ee1f | 597 | |
6f23ee1f | 598 | if (length != 0) { |
b375e116 AS |
599 | length = mon_bin_get_data(rp, offset, urb, length, |
600 | &ep->flag_data); | |
601 | if (length > 0) { | |
fca94748 AS |
602 | delta = (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
603 | ep->len_cap -= length; | |
604 | delta -= (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
605 | mon_buff_area_shrink(rp, delta); | |
6f23ee1f PZ |
606 | } |
607 | } else { | |
608 | ep->flag_data = data_tag; | |
609 | } | |
610 | ||
611 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
612 | ||
613 | wake_up(&rp->b_wait); | |
614 | } | |
615 | ||
616 | static void mon_bin_submit(void *data, struct urb *urb) | |
617 | { | |
618 | struct mon_reader_bin *rp = data; | |
9347d51c | 619 | mon_bin_event(rp, urb, 'S', -EINPROGRESS); |
6f23ee1f PZ |
620 | } |
621 | ||
9347d51c | 622 | static void mon_bin_complete(void *data, struct urb *urb, int status) |
6f23ee1f PZ |
623 | { |
624 | struct mon_reader_bin *rp = data; | |
9347d51c | 625 | mon_bin_event(rp, urb, 'C', status); |
6f23ee1f PZ |
626 | } |
627 | ||
628 | static void mon_bin_error(void *data, struct urb *urb, int error) | |
629 | { | |
630 | struct mon_reader_bin *rp = data; | |
2bc0d109 | 631 | struct timeval ts; |
6f23ee1f PZ |
632 | unsigned long flags; |
633 | unsigned int offset; | |
634 | struct mon_bin_hdr *ep; | |
635 | ||
2bc0d109 PZ |
636 | do_gettimeofday(&ts); |
637 | ||
6f23ee1f PZ |
638 | spin_lock_irqsave(&rp->b_lock, flags); |
639 | ||
640 | offset = mon_buff_area_alloc(rp, PKT_SIZE); | |
641 | if (offset == ~0) { | |
642 | /* Not incrementing cnt_lost. Just because. */ | |
643 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
644 | return; | |
645 | } | |
646 | ||
647 | ep = MON_OFF2HDR(rp, offset); | |
648 | ||
649 | memset(ep, 0, PKT_SIZE); | |
650 | ep->type = 'E'; | |
30c7431d PZ |
651 | ep->xfer_type = xfer_to_pipe[usb_endpoint_type(&urb->ep->desc)]; |
652 | ep->epnum = usb_urb_dir_in(urb) ? USB_DIR_IN : 0; | |
653 | ep->epnum |= usb_endpoint_num(&urb->ep->desc); | |
18ea5d00 | 654 | ep->devnum = urb->dev->devnum; |
ecb658d3 | 655 | ep->busnum = urb->dev->bus->busnum; |
6f23ee1f | 656 | ep->id = (unsigned long) urb; |
2bc0d109 PZ |
657 | ep->ts_sec = ts.tv_sec; |
658 | ep->ts_usec = ts.tv_usec; | |
6f23ee1f PZ |
659 | ep->status = error; |
660 | ||
661 | ep->flag_setup = '-'; | |
662 | ep->flag_data = 'E'; | |
663 | ||
664 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
665 | ||
666 | wake_up(&rp->b_wait); | |
667 | } | |
668 | ||
669 | static int mon_bin_open(struct inode *inode, struct file *file) | |
670 | { | |
671 | struct mon_bus *mbus; | |
6f23ee1f PZ |
672 | struct mon_reader_bin *rp; |
673 | size_t size; | |
674 | int rc; | |
675 | ||
676 | mutex_lock(&mon_lock); | |
677 | if ((mbus = mon_bus_lookup(iminor(inode))) == NULL) { | |
678 | mutex_unlock(&mon_lock); | |
679 | return -ENODEV; | |
680 | } | |
ecb658d3 | 681 | if (mbus != &mon_bus0 && mbus->u_bus == NULL) { |
6f23ee1f PZ |
682 | printk(KERN_ERR TAG ": consistency error on open\n"); |
683 | mutex_unlock(&mon_lock); | |
684 | return -ENODEV; | |
685 | } | |
686 | ||
687 | rp = kzalloc(sizeof(struct mon_reader_bin), GFP_KERNEL); | |
688 | if (rp == NULL) { | |
689 | rc = -ENOMEM; | |
690 | goto err_alloc; | |
691 | } | |
692 | spin_lock_init(&rp->b_lock); | |
693 | init_waitqueue_head(&rp->b_wait); | |
694 | mutex_init(&rp->fetch_lock); | |
6f23ee1f PZ |
695 | rp->b_size = BUFF_DFL; |
696 | ||
697 | size = sizeof(struct mon_pgmap) * (rp->b_size/CHUNK_SIZE); | |
698 | if ((rp->b_vec = kzalloc(size, GFP_KERNEL)) == NULL) { | |
699 | rc = -ENOMEM; | |
700 | goto err_allocvec; | |
701 | } | |
702 | ||
703 | if ((rc = mon_alloc_buff(rp->b_vec, rp->b_size/CHUNK_SIZE)) < 0) | |
704 | goto err_allocbuff; | |
705 | ||
706 | rp->r.m_bus = mbus; | |
707 | rp->r.r_data = rp; | |
708 | rp->r.rnf_submit = mon_bin_submit; | |
709 | rp->r.rnf_error = mon_bin_error; | |
710 | rp->r.rnf_complete = mon_bin_complete; | |
711 | ||
712 | mon_reader_add(mbus, &rp->r); | |
713 | ||
714 | file->private_data = rp; | |
715 | mutex_unlock(&mon_lock); | |
716 | return 0; | |
717 | ||
718 | err_allocbuff: | |
719 | kfree(rp->b_vec); | |
720 | err_allocvec: | |
721 | kfree(rp); | |
722 | err_alloc: | |
723 | mutex_unlock(&mon_lock); | |
724 | return rc; | |
725 | } | |
726 | ||
727 | /* | |
728 | * Extract an event from buffer and copy it to user space. | |
729 | * Wait if there is no event ready. | |
730 | * Returns zero or error. | |
731 | */ | |
732 | static int mon_bin_get_event(struct file *file, struct mon_reader_bin *rp, | |
471c604d PZ |
733 | struct mon_bin_hdr __user *hdr, unsigned int hdrbytes, |
734 | void __user *data, unsigned int nbytes) | |
6f23ee1f PZ |
735 | { |
736 | unsigned long flags; | |
737 | struct mon_bin_hdr *ep; | |
738 | size_t step_len; | |
739 | unsigned int offset; | |
740 | int rc; | |
741 | ||
742 | mutex_lock(&rp->fetch_lock); | |
743 | ||
744 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { | |
745 | mutex_unlock(&rp->fetch_lock); | |
746 | return rc; | |
747 | } | |
748 | ||
749 | ep = MON_OFF2HDR(rp, rp->b_out); | |
750 | ||
471c604d | 751 | if (copy_to_user(hdr, ep, hdrbytes)) { |
6f23ee1f PZ |
752 | mutex_unlock(&rp->fetch_lock); |
753 | return -EFAULT; | |
754 | } | |
755 | ||
756 | step_len = min(ep->len_cap, nbytes); | |
757 | if ((offset = rp->b_out + PKT_SIZE) >= rp->b_size) offset = 0; | |
758 | ||
759 | if (copy_from_buf(rp, offset, data, step_len)) { | |
760 | mutex_unlock(&rp->fetch_lock); | |
761 | return -EFAULT; | |
762 | } | |
763 | ||
764 | spin_lock_irqsave(&rp->b_lock, flags); | |
765 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); | |
766 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
767 | rp->b_read = 0; | |
768 | ||
769 | mutex_unlock(&rp->fetch_lock); | |
770 | return 0; | |
771 | } | |
772 | ||
773 | static int mon_bin_release(struct inode *inode, struct file *file) | |
774 | { | |
775 | struct mon_reader_bin *rp = file->private_data; | |
776 | struct mon_bus* mbus = rp->r.m_bus; | |
777 | ||
778 | mutex_lock(&mon_lock); | |
779 | ||
780 | if (mbus->nreaders <= 0) { | |
781 | printk(KERN_ERR TAG ": consistency error on close\n"); | |
782 | mutex_unlock(&mon_lock); | |
783 | return 0; | |
784 | } | |
785 | mon_reader_del(mbus, &rp->r); | |
786 | ||
787 | mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE); | |
788 | kfree(rp->b_vec); | |
789 | kfree(rp); | |
790 | ||
791 | mutex_unlock(&mon_lock); | |
792 | return 0; | |
793 | } | |
794 | ||
795 | static ssize_t mon_bin_read(struct file *file, char __user *buf, | |
796 | size_t nbytes, loff_t *ppos) | |
797 | { | |
798 | struct mon_reader_bin *rp = file->private_data; | |
471c604d | 799 | unsigned int hdrbytes = PKT_SZ_API0; |
6f23ee1f PZ |
800 | unsigned long flags; |
801 | struct mon_bin_hdr *ep; | |
802 | unsigned int offset; | |
803 | size_t step_len; | |
804 | char *ptr; | |
805 | ssize_t done = 0; | |
806 | int rc; | |
807 | ||
808 | mutex_lock(&rp->fetch_lock); | |
809 | ||
810 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { | |
811 | mutex_unlock(&rp->fetch_lock); | |
812 | return rc; | |
813 | } | |
814 | ||
815 | ep = MON_OFF2HDR(rp, rp->b_out); | |
816 | ||
471c604d PZ |
817 | if (rp->b_read < hdrbytes) { |
818 | step_len = min(nbytes, (size_t)(hdrbytes - rp->b_read)); | |
6f23ee1f PZ |
819 | ptr = ((char *)ep) + rp->b_read; |
820 | if (step_len && copy_to_user(buf, ptr, step_len)) { | |
821 | mutex_unlock(&rp->fetch_lock); | |
822 | return -EFAULT; | |
823 | } | |
824 | nbytes -= step_len; | |
825 | buf += step_len; | |
826 | rp->b_read += step_len; | |
827 | done += step_len; | |
828 | } | |
829 | ||
471c604d | 830 | if (rp->b_read >= hdrbytes) { |
f1c0a2a3 | 831 | step_len = ep->len_cap; |
471c604d | 832 | step_len -= rp->b_read - hdrbytes; |
f1c0a2a3 PZ |
833 | if (step_len > nbytes) |
834 | step_len = nbytes; | |
6f23ee1f | 835 | offset = rp->b_out + PKT_SIZE; |
471c604d | 836 | offset += rp->b_read - hdrbytes; |
6f23ee1f PZ |
837 | if (offset >= rp->b_size) |
838 | offset -= rp->b_size; | |
839 | if (copy_from_buf(rp, offset, buf, step_len)) { | |
840 | mutex_unlock(&rp->fetch_lock); | |
841 | return -EFAULT; | |
842 | } | |
843 | nbytes -= step_len; | |
844 | buf += step_len; | |
845 | rp->b_read += step_len; | |
846 | done += step_len; | |
847 | } | |
848 | ||
849 | /* | |
850 | * Check if whole packet was read, and if so, jump to the next one. | |
851 | */ | |
471c604d | 852 | if (rp->b_read >= hdrbytes + ep->len_cap) { |
6f23ee1f PZ |
853 | spin_lock_irqsave(&rp->b_lock, flags); |
854 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); | |
855 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
856 | rp->b_read = 0; | |
857 | } | |
858 | ||
859 | mutex_unlock(&rp->fetch_lock); | |
860 | return done; | |
861 | } | |
862 | ||
863 | /* | |
864 | * Remove at most nevents from chunked buffer. | |
865 | * Returns the number of removed events. | |
866 | */ | |
867 | static int mon_bin_flush(struct mon_reader_bin *rp, unsigned nevents) | |
868 | { | |
869 | unsigned long flags; | |
870 | struct mon_bin_hdr *ep; | |
871 | int i; | |
872 | ||
873 | mutex_lock(&rp->fetch_lock); | |
874 | spin_lock_irqsave(&rp->b_lock, flags); | |
875 | for (i = 0; i < nevents; ++i) { | |
876 | if (MON_RING_EMPTY(rp)) | |
877 | break; | |
878 | ||
879 | ep = MON_OFF2HDR(rp, rp->b_out); | |
880 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); | |
881 | } | |
882 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
883 | rp->b_read = 0; | |
884 | mutex_unlock(&rp->fetch_lock); | |
885 | return i; | |
886 | } | |
887 | ||
888 | /* | |
889 | * Fetch at most max event offsets into the buffer and put them into vec. | |
890 | * The events are usually freed later with mon_bin_flush. | |
891 | * Return the effective number of events fetched. | |
892 | */ | |
893 | static int mon_bin_fetch(struct file *file, struct mon_reader_bin *rp, | |
894 | u32 __user *vec, unsigned int max) | |
895 | { | |
896 | unsigned int cur_out; | |
897 | unsigned int bytes, avail; | |
898 | unsigned int size; | |
899 | unsigned int nevents; | |
900 | struct mon_bin_hdr *ep; | |
901 | unsigned long flags; | |
902 | int rc; | |
903 | ||
904 | mutex_lock(&rp->fetch_lock); | |
905 | ||
906 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { | |
907 | mutex_unlock(&rp->fetch_lock); | |
908 | return rc; | |
909 | } | |
910 | ||
911 | spin_lock_irqsave(&rp->b_lock, flags); | |
912 | avail = rp->b_cnt; | |
913 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
914 | ||
915 | cur_out = rp->b_out; | |
916 | nevents = 0; | |
917 | bytes = 0; | |
918 | while (bytes < avail) { | |
919 | if (nevents >= max) | |
920 | break; | |
921 | ||
922 | ep = MON_OFF2HDR(rp, cur_out); | |
923 | if (put_user(cur_out, &vec[nevents])) { | |
924 | mutex_unlock(&rp->fetch_lock); | |
925 | return -EFAULT; | |
926 | } | |
927 | ||
928 | nevents++; | |
929 | size = ep->len_cap + PKT_SIZE; | |
930 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
931 | if ((cur_out += size) >= rp->b_size) | |
932 | cur_out -= rp->b_size; | |
933 | bytes += size; | |
934 | } | |
935 | ||
936 | mutex_unlock(&rp->fetch_lock); | |
937 | return nevents; | |
938 | } | |
939 | ||
940 | /* | |
941 | * Count events. This is almost the same as the above mon_bin_fetch, | |
942 | * only we do not store offsets into user vector, and we have no limit. | |
943 | */ | |
944 | static int mon_bin_queued(struct mon_reader_bin *rp) | |
945 | { | |
946 | unsigned int cur_out; | |
947 | unsigned int bytes, avail; | |
948 | unsigned int size; | |
949 | unsigned int nevents; | |
950 | struct mon_bin_hdr *ep; | |
951 | unsigned long flags; | |
952 | ||
953 | mutex_lock(&rp->fetch_lock); | |
954 | ||
955 | spin_lock_irqsave(&rp->b_lock, flags); | |
956 | avail = rp->b_cnt; | |
957 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
958 | ||
959 | cur_out = rp->b_out; | |
960 | nevents = 0; | |
961 | bytes = 0; | |
962 | while (bytes < avail) { | |
963 | ep = MON_OFF2HDR(rp, cur_out); | |
964 | ||
965 | nevents++; | |
966 | size = ep->len_cap + PKT_SIZE; | |
967 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); | |
968 | if ((cur_out += size) >= rp->b_size) | |
969 | cur_out -= rp->b_size; | |
970 | bytes += size; | |
971 | } | |
972 | ||
973 | mutex_unlock(&rp->fetch_lock); | |
974 | return nevents; | |
975 | } | |
976 | ||
977 | /* | |
978 | */ | |
3b759c75 | 979 | static long mon_bin_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
6f23ee1f PZ |
980 | { |
981 | struct mon_reader_bin *rp = file->private_data; | |
982 | // struct mon_bus* mbus = rp->r.m_bus; | |
983 | int ret = 0; | |
984 | struct mon_bin_hdr *ep; | |
985 | unsigned long flags; | |
986 | ||
987 | switch (cmd) { | |
988 | ||
989 | case MON_IOCQ_URB_LEN: | |
990 | /* | |
991 | * N.B. This only returns the size of data, without the header. | |
992 | */ | |
993 | spin_lock_irqsave(&rp->b_lock, flags); | |
994 | if (!MON_RING_EMPTY(rp)) { | |
995 | ep = MON_OFF2HDR(rp, rp->b_out); | |
996 | ret = ep->len_cap; | |
997 | } | |
998 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
999 | break; | |
1000 | ||
1001 | case MON_IOCQ_RING_SIZE: | |
1002 | ret = rp->b_size; | |
1003 | break; | |
1004 | ||
1005 | case MON_IOCT_RING_SIZE: | |
1006 | /* | |
1007 | * Changing the buffer size will flush it's contents; the new | |
1008 | * buffer is allocated before releasing the old one to be sure | |
1009 | * the device will stay functional also in case of memory | |
1010 | * pressure. | |
1011 | */ | |
1012 | { | |
1013 | int size; | |
1014 | struct mon_pgmap *vec; | |
1015 | ||
1016 | if (arg < BUFF_MIN || arg > BUFF_MAX) | |
1017 | return -EINVAL; | |
1018 | ||
1019 | size = CHUNK_ALIGN(arg); | |
1020 | if ((vec = kzalloc(sizeof(struct mon_pgmap) * (size/CHUNK_SIZE), | |
1021 | GFP_KERNEL)) == NULL) { | |
1022 | ret = -ENOMEM; | |
1023 | break; | |
1024 | } | |
1025 | ||
1026 | ret = mon_alloc_buff(vec, size/CHUNK_SIZE); | |
1027 | if (ret < 0) { | |
1028 | kfree(vec); | |
1029 | break; | |
1030 | } | |
1031 | ||
1032 | mutex_lock(&rp->fetch_lock); | |
1033 | spin_lock_irqsave(&rp->b_lock, flags); | |
33d973ad | 1034 | mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE); |
6f23ee1f PZ |
1035 | kfree(rp->b_vec); |
1036 | rp->b_vec = vec; | |
1037 | rp->b_size = size; | |
1038 | rp->b_read = rp->b_in = rp->b_out = rp->b_cnt = 0; | |
1039 | rp->cnt_lost = 0; | |
1040 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
1041 | mutex_unlock(&rp->fetch_lock); | |
1042 | } | |
1043 | break; | |
1044 | ||
1045 | case MON_IOCH_MFLUSH: | |
1046 | ret = mon_bin_flush(rp, arg); | |
1047 | break; | |
1048 | ||
1049 | case MON_IOCX_GET: | |
471c604d | 1050 | case MON_IOCX_GETX: |
6f23ee1f PZ |
1051 | { |
1052 | struct mon_bin_get getb; | |
1053 | ||
1054 | if (copy_from_user(&getb, (void __user *)arg, | |
1055 | sizeof(struct mon_bin_get))) | |
1056 | return -EFAULT; | |
1057 | ||
1058 | if (getb.alloc > 0x10000000) /* Want to cast to u32 */ | |
1059 | return -EINVAL; | |
471c604d PZ |
1060 | ret = mon_bin_get_event(file, rp, getb.hdr, |
1061 | (cmd == MON_IOCX_GET)? PKT_SZ_API0: PKT_SZ_API1, | |
1062 | getb.data, (unsigned int)getb.alloc); | |
6f23ee1f PZ |
1063 | } |
1064 | break; | |
1065 | ||
6f23ee1f PZ |
1066 | case MON_IOCX_MFETCH: |
1067 | { | |
1068 | struct mon_bin_mfetch mfetch; | |
1069 | struct mon_bin_mfetch __user *uptr; | |
1070 | ||
1071 | uptr = (struct mon_bin_mfetch __user *)arg; | |
1072 | ||
1073 | if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) | |
1074 | return -EFAULT; | |
1075 | ||
1076 | if (mfetch.nflush) { | |
1077 | ret = mon_bin_flush(rp, mfetch.nflush); | |
1078 | if (ret < 0) | |
1079 | return ret; | |
1080 | if (put_user(ret, &uptr->nflush)) | |
1081 | return -EFAULT; | |
1082 | } | |
1083 | ret = mon_bin_fetch(file, rp, mfetch.offvec, mfetch.nfetch); | |
1084 | if (ret < 0) | |
1085 | return ret; | |
1086 | if (put_user(ret, &uptr->nfetch)) | |
1087 | return -EFAULT; | |
1088 | ret = 0; | |
1089 | } | |
1090 | break; | |
1091 | ||
7abce6be PZ |
1092 | case MON_IOCG_STATS: { |
1093 | struct mon_bin_stats __user *sp; | |
1094 | unsigned int nevents; | |
1095 | unsigned int ndropped; | |
1096 | ||
1097 | spin_lock_irqsave(&rp->b_lock, flags); | |
1098 | ndropped = rp->cnt_lost; | |
1099 | rp->cnt_lost = 0; | |
1100 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
1101 | nevents = mon_bin_queued(rp); | |
1102 | ||
1103 | sp = (struct mon_bin_stats __user *)arg; | |
236c448c | 1104 | if (put_user(ndropped, &sp->dropped)) |
7abce6be PZ |
1105 | return -EFAULT; |
1106 | if (put_user(nevents, &sp->queued)) | |
1107 | return -EFAULT; | |
1108 | ||
1109 | } | |
1110 | break; | |
1111 | ||
1112 | default: | |
1113 | return -ENOTTY; | |
1114 | } | |
1115 | ||
1116 | return ret; | |
1117 | } | |
1118 | ||
6f23ee1f | 1119 | #ifdef CONFIG_COMPAT |
7abce6be PZ |
1120 | static long mon_bin_compat_ioctl(struct file *file, |
1121 | unsigned int cmd, unsigned long arg) | |
1122 | { | |
1123 | struct mon_reader_bin *rp = file->private_data; | |
1124 | int ret; | |
1125 | ||
1126 | switch (cmd) { | |
1127 | ||
471c604d PZ |
1128 | case MON_IOCX_GET32: |
1129 | case MON_IOCX_GETX32: | |
1130 | { | |
7abce6be PZ |
1131 | struct mon_bin_get32 getb; |
1132 | ||
1133 | if (copy_from_user(&getb, (void __user *)arg, | |
1134 | sizeof(struct mon_bin_get32))) | |
1135 | return -EFAULT; | |
1136 | ||
471c604d PZ |
1137 | ret = mon_bin_get_event(file, rp, compat_ptr(getb.hdr32), |
1138 | (cmd == MON_IOCX_GET32)? PKT_SZ_API0: PKT_SZ_API1, | |
1139 | compat_ptr(getb.data32), getb.alloc32); | |
7abce6be PZ |
1140 | if (ret < 0) |
1141 | return ret; | |
1142 | } | |
1143 | return 0; | |
1144 | ||
6f23ee1f PZ |
1145 | case MON_IOCX_MFETCH32: |
1146 | { | |
1147 | struct mon_bin_mfetch32 mfetch; | |
1148 | struct mon_bin_mfetch32 __user *uptr; | |
1149 | ||
1150 | uptr = (struct mon_bin_mfetch32 __user *) compat_ptr(arg); | |
1151 | ||
1152 | if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) | |
1153 | return -EFAULT; | |
1154 | ||
1155 | if (mfetch.nflush32) { | |
1156 | ret = mon_bin_flush(rp, mfetch.nflush32); | |
1157 | if (ret < 0) | |
1158 | return ret; | |
1159 | if (put_user(ret, &uptr->nflush32)) | |
1160 | return -EFAULT; | |
1161 | } | |
1162 | ret = mon_bin_fetch(file, rp, compat_ptr(mfetch.offvec32), | |
1163 | mfetch.nfetch32); | |
1164 | if (ret < 0) | |
1165 | return ret; | |
1166 | if (put_user(ret, &uptr->nfetch32)) | |
1167 | return -EFAULT; | |
6f23ee1f | 1168 | } |
7abce6be | 1169 | return 0; |
6f23ee1f | 1170 | |
7abce6be | 1171 | case MON_IOCG_STATS: |
55929332 | 1172 | return mon_bin_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); |
6f23ee1f | 1173 | |
7abce6be PZ |
1174 | case MON_IOCQ_URB_LEN: |
1175 | case MON_IOCQ_RING_SIZE: | |
1176 | case MON_IOCT_RING_SIZE: | |
1177 | case MON_IOCH_MFLUSH: | |
55929332 | 1178 | return mon_bin_ioctl(file, cmd, arg); |
6f23ee1f PZ |
1179 | |
1180 | default: | |
7abce6be | 1181 | ; |
6f23ee1f | 1182 | } |
7abce6be | 1183 | return -ENOTTY; |
6f23ee1f | 1184 | } |
7abce6be | 1185 | #endif /* CONFIG_COMPAT */ |
6f23ee1f PZ |
1186 | |
1187 | static unsigned int | |
1188 | mon_bin_poll(struct file *file, struct poll_table_struct *wait) | |
1189 | { | |
1190 | struct mon_reader_bin *rp = file->private_data; | |
1191 | unsigned int mask = 0; | |
1192 | unsigned long flags; | |
1193 | ||
1194 | if (file->f_mode & FMODE_READ) | |
1195 | poll_wait(file, &rp->b_wait, wait); | |
1196 | ||
1197 | spin_lock_irqsave(&rp->b_lock, flags); | |
1198 | if (!MON_RING_EMPTY(rp)) | |
1199 | mask |= POLLIN | POLLRDNORM; /* readable */ | |
1200 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
1201 | return mask; | |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | * open and close: just keep track of how many times the device is | |
1206 | * mapped, to use the proper memory allocation function. | |
1207 | */ | |
1208 | static void mon_bin_vma_open(struct vm_area_struct *vma) | |
1209 | { | |
1210 | struct mon_reader_bin *rp = vma->vm_private_data; | |
1211 | rp->mmap_active++; | |
1212 | } | |
1213 | ||
1214 | static void mon_bin_vma_close(struct vm_area_struct *vma) | |
1215 | { | |
1216 | struct mon_reader_bin *rp = vma->vm_private_data; | |
1217 | rp->mmap_active--; | |
1218 | } | |
1219 | ||
1220 | /* | |
1221 | * Map ring pages to user space. | |
1222 | */ | |
041509db | 1223 | static int mon_bin_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
6f23ee1f PZ |
1224 | { |
1225 | struct mon_reader_bin *rp = vma->vm_private_data; | |
1226 | unsigned long offset, chunk_idx; | |
1227 | struct page *pageptr; | |
1228 | ||
041509db | 1229 | offset = vmf->pgoff << PAGE_SHIFT; |
6f23ee1f | 1230 | if (offset >= rp->b_size) |
041509db | 1231 | return VM_FAULT_SIGBUS; |
6f23ee1f PZ |
1232 | chunk_idx = offset / CHUNK_SIZE; |
1233 | pageptr = rp->b_vec[chunk_idx].pg; | |
1234 | get_page(pageptr); | |
041509db NP |
1235 | vmf->page = pageptr; |
1236 | return 0; | |
6f23ee1f PZ |
1237 | } |
1238 | ||
f0f37e2f | 1239 | static const struct vm_operations_struct mon_bin_vm_ops = { |
6f23ee1f PZ |
1240 | .open = mon_bin_vma_open, |
1241 | .close = mon_bin_vma_close, | |
041509db | 1242 | .fault = mon_bin_vma_fault, |
6f23ee1f PZ |
1243 | }; |
1244 | ||
454459b0 | 1245 | static int mon_bin_mmap(struct file *filp, struct vm_area_struct *vma) |
6f23ee1f | 1246 | { |
041509db | 1247 | /* don't do anything here: "fault" will set up page table entries */ |
6f23ee1f PZ |
1248 | vma->vm_ops = &mon_bin_vm_ops; |
1249 | vma->vm_flags |= VM_RESERVED; | |
1250 | vma->vm_private_data = filp->private_data; | |
1251 | mon_bin_vma_open(vma); | |
1252 | return 0; | |
1253 | } | |
1254 | ||
0b3f5fe6 | 1255 | static const struct file_operations mon_fops_binary = { |
6f23ee1f PZ |
1256 | .owner = THIS_MODULE, |
1257 | .open = mon_bin_open, | |
1258 | .llseek = no_llseek, | |
1259 | .read = mon_bin_read, | |
1260 | /* .write = mon_text_write, */ | |
1261 | .poll = mon_bin_poll, | |
3b759c75 | 1262 | .unlocked_ioctl = mon_bin_ioctl, |
7abce6be PZ |
1263 | #ifdef CONFIG_COMPAT |
1264 | .compat_ioctl = mon_bin_compat_ioctl, | |
1265 | #endif | |
6f23ee1f | 1266 | .release = mon_bin_release, |
454459b0 | 1267 | .mmap = mon_bin_mmap, |
6f23ee1f PZ |
1268 | }; |
1269 | ||
1270 | static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp) | |
1271 | { | |
1272 | DECLARE_WAITQUEUE(waita, current); | |
1273 | unsigned long flags; | |
1274 | ||
1275 | add_wait_queue(&rp->b_wait, &waita); | |
1276 | set_current_state(TASK_INTERRUPTIBLE); | |
1277 | ||
1278 | spin_lock_irqsave(&rp->b_lock, flags); | |
1279 | while (MON_RING_EMPTY(rp)) { | |
1280 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
1281 | ||
1282 | if (file->f_flags & O_NONBLOCK) { | |
1283 | set_current_state(TASK_RUNNING); | |
1284 | remove_wait_queue(&rp->b_wait, &waita); | |
1285 | return -EWOULDBLOCK; /* Same as EAGAIN in Linux */ | |
1286 | } | |
1287 | schedule(); | |
1288 | if (signal_pending(current)) { | |
1289 | remove_wait_queue(&rp->b_wait, &waita); | |
1290 | return -EINTR; | |
1291 | } | |
1292 | set_current_state(TASK_INTERRUPTIBLE); | |
1293 | ||
1294 | spin_lock_irqsave(&rp->b_lock, flags); | |
1295 | } | |
1296 | spin_unlock_irqrestore(&rp->b_lock, flags); | |
1297 | ||
1298 | set_current_state(TASK_RUNNING); | |
1299 | remove_wait_queue(&rp->b_wait, &waita); | |
1300 | return 0; | |
1301 | } | |
1302 | ||
1303 | static int mon_alloc_buff(struct mon_pgmap *map, int npages) | |
1304 | { | |
1305 | int n; | |
1306 | unsigned long vaddr; | |
1307 | ||
1308 | for (n = 0; n < npages; n++) { | |
1309 | vaddr = get_zeroed_page(GFP_KERNEL); | |
1310 | if (vaddr == 0) { | |
1311 | while (n-- != 0) | |
1312 | free_page((unsigned long) map[n].ptr); | |
1313 | return -ENOMEM; | |
1314 | } | |
1315 | map[n].ptr = (unsigned char *) vaddr; | |
5bfd7560 | 1316 | map[n].pg = virt_to_page((void *) vaddr); |
6f23ee1f PZ |
1317 | } |
1318 | return 0; | |
1319 | } | |
1320 | ||
1321 | static void mon_free_buff(struct mon_pgmap *map, int npages) | |
1322 | { | |
1323 | int n; | |
1324 | ||
1325 | for (n = 0; n < npages; n++) | |
1326 | free_page((unsigned long) map[n].ptr); | |
1327 | } | |
1328 | ||
ce7cd137 PZ |
1329 | int mon_bin_add(struct mon_bus *mbus, const struct usb_bus *ubus) |
1330 | { | |
1331 | struct device *dev; | |
1332 | unsigned minor = ubus? ubus->busnum: 0; | |
1333 | ||
1334 | if (minor >= MON_BIN_MAX_MINOR) | |
1335 | return 0; | |
1336 | ||
b0b090e5 GKH |
1337 | dev = device_create(mon_bin_class, ubus ? ubus->controller : NULL, |
1338 | MKDEV(MAJOR(mon_bin_dev0), minor), NULL, | |
1339 | "usbmon%d", minor); | |
ce7cd137 PZ |
1340 | if (IS_ERR(dev)) |
1341 | return 0; | |
1342 | ||
1343 | mbus->classdev = dev; | |
1344 | return 1; | |
1345 | } | |
1346 | ||
1347 | void mon_bin_del(struct mon_bus *mbus) | |
1348 | { | |
1349 | device_destroy(mon_bin_class, mbus->classdev->devt); | |
1350 | } | |
1351 | ||
6f23ee1f PZ |
1352 | int __init mon_bin_init(void) |
1353 | { | |
1354 | int rc; | |
1355 | ||
ce7cd137 PZ |
1356 | mon_bin_class = class_create(THIS_MODULE, "usbmon"); |
1357 | if (IS_ERR(mon_bin_class)) { | |
1358 | rc = PTR_ERR(mon_bin_class); | |
1359 | goto err_class; | |
1360 | } | |
1361 | ||
6f23ee1f PZ |
1362 | rc = alloc_chrdev_region(&mon_bin_dev0, 0, MON_BIN_MAX_MINOR, "usbmon"); |
1363 | if (rc < 0) | |
1364 | goto err_dev; | |
1365 | ||
1366 | cdev_init(&mon_bin_cdev, &mon_fops_binary); | |
1367 | mon_bin_cdev.owner = THIS_MODULE; | |
1368 | ||
1369 | rc = cdev_add(&mon_bin_cdev, mon_bin_dev0, MON_BIN_MAX_MINOR); | |
1370 | if (rc < 0) | |
1371 | goto err_add; | |
1372 | ||
1373 | return 0; | |
1374 | ||
1375 | err_add: | |
1376 | unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); | |
1377 | err_dev: | |
ce7cd137 PZ |
1378 | class_destroy(mon_bin_class); |
1379 | err_class: | |
6f23ee1f PZ |
1380 | return rc; |
1381 | } | |
1382 | ||
21641e3f | 1383 | void mon_bin_exit(void) |
6f23ee1f PZ |
1384 | { |
1385 | cdev_del(&mon_bin_cdev); | |
1386 | unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); | |
ce7cd137 | 1387 | class_destroy(mon_bin_class); |
6f23ee1f | 1388 | } |