Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 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) |
Pete Zaitcev | ce7cd137f | 2007-05-03 16:51:16 -0700 | [diff] [blame] | 7 | * Copyright (C) 2006,2007 Pete Zaitcev (zaitcev@redhat.com) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 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> |
Jonathan Corbet | 1af46fd | 2008-05-16 14:23:31 -0600 | [diff] [blame] | 18 | #include <linux/smp_lock.h> |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 19 | #include <linux/scatterlist.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 21 | |
| 22 | #include <asm/uaccess.h> |
| 23 | |
| 24 | #include "usb_mon.h" |
| 25 | |
| 26 | /* |
| 27 | * Defined by USB 2.0 clause 9.3, table 9.2. |
| 28 | */ |
| 29 | #define SETUP_LEN 8 |
| 30 | |
| 31 | /* ioctl macros */ |
| 32 | #define MON_IOC_MAGIC 0x92 |
| 33 | |
| 34 | #define MON_IOCQ_URB_LEN _IO(MON_IOC_MAGIC, 1) |
| 35 | /* #2 used to be MON_IOCX_URB, removed before it got into Linus tree */ |
| 36 | #define MON_IOCG_STATS _IOR(MON_IOC_MAGIC, 3, struct mon_bin_stats) |
| 37 | #define MON_IOCT_RING_SIZE _IO(MON_IOC_MAGIC, 4) |
| 38 | #define MON_IOCQ_RING_SIZE _IO(MON_IOC_MAGIC, 5) |
| 39 | #define MON_IOCX_GET _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get) |
| 40 | #define MON_IOCX_MFETCH _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch) |
| 41 | #define MON_IOCH_MFLUSH _IO(MON_IOC_MAGIC, 8) |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 42 | /* #9 was MON_IOCT_SETAPI */ |
| 43 | #define MON_IOCX_GETX _IOW(MON_IOC_MAGIC, 10, struct mon_bin_get) |
Pete Zaitcev | 7abce6b | 2008-12-20 12:56:08 -0700 | [diff] [blame] | 44 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 45 | #ifdef CONFIG_COMPAT |
| 46 | #define MON_IOCX_GET32 _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get32) |
| 47 | #define MON_IOCX_MFETCH32 _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch32) |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 48 | #define MON_IOCX_GETX32 _IOW(MON_IOC_MAGIC, 10, struct mon_bin_get32) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 49 | #endif |
| 50 | |
| 51 | /* |
| 52 | * Some architectures have enormous basic pages (16KB for ia64, 64KB for ppc). |
| 53 | * But it's all right. Just use a simple way to make sure the chunk is never |
| 54 | * smaller than a page. |
| 55 | * |
| 56 | * N.B. An application does not know our chunk size. |
| 57 | * |
| 58 | * Woops, get_zeroed_page() returns a single page. I guess we're stuck with |
| 59 | * page-sized chunks for the time being. |
| 60 | */ |
| 61 | #define CHUNK_SIZE PAGE_SIZE |
| 62 | #define CHUNK_ALIGN(x) (((x)+CHUNK_SIZE-1) & ~(CHUNK_SIZE-1)) |
| 63 | |
| 64 | /* |
| 65 | * The magic limit was calculated so that it allows the monitoring |
| 66 | * application to pick data once in two ticks. This way, another application, |
| 67 | * which presumably drives the bus, gets to hog CPU, yet we collect our data. |
| 68 | * If HZ is 100, a 480 mbit/s bus drives 614 KB every jiffy. USB has an |
| 69 | * enormous overhead built into the bus protocol, so we need about 1000 KB. |
| 70 | * |
| 71 | * This is still too much for most cases, where we just snoop a few |
| 72 | * descriptor fetches for enumeration. So, the default is a "reasonable" |
| 73 | * amount for systems with HZ=250 and incomplete bus saturation. |
| 74 | * |
| 75 | * XXX What about multi-megabyte URBs which take minutes to transfer? |
| 76 | */ |
| 77 | #define BUFF_MAX CHUNK_ALIGN(1200*1024) |
| 78 | #define BUFF_DFL CHUNK_ALIGN(300*1024) |
| 79 | #define BUFF_MIN CHUNK_ALIGN(8*1024) |
| 80 | |
| 81 | /* |
| 82 | * The per-event API header (2 per URB). |
| 83 | * |
| 84 | * This structure is seen in userland as defined by the documentation. |
| 85 | */ |
| 86 | struct mon_bin_hdr { |
| 87 | u64 id; /* URB ID - from submission to callback */ |
| 88 | unsigned char type; /* Same as in text API; extensible. */ |
| 89 | unsigned char xfer_type; /* ISO, Intr, Control, Bulk */ |
| 90 | unsigned char epnum; /* Endpoint number and transfer direction */ |
| 91 | unsigned char devnum; /* Device address */ |
| 92 | unsigned short busnum; /* Bus number */ |
| 93 | char flag_setup; |
| 94 | char flag_data; |
| 95 | s64 ts_sec; /* gettimeofday */ |
| 96 | s32 ts_usec; /* gettimeofday */ |
| 97 | int status; |
| 98 | unsigned int len_urb; /* Length of data (submitted or actual) */ |
| 99 | unsigned int len_cap; /* Delivered length */ |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 100 | union { |
| 101 | unsigned char setup[SETUP_LEN]; /* Only for Control S-type */ |
| 102 | struct iso_rec { |
| 103 | int error_count; |
| 104 | int numdesc; |
| 105 | } iso; |
| 106 | } s; |
| 107 | int interval; |
| 108 | int start_frame; |
| 109 | unsigned int xfer_flags; |
| 110 | unsigned int ndesc; /* Actual number of ISO descriptors */ |
| 111 | }; |
| 112 | |
| 113 | /* |
| 114 | * ISO vector, packed into the head of data stream. |
| 115 | * This has to take 16 bytes to make sure that the end of buffer |
| 116 | * wrap is not happening in the middle of a descriptor. |
| 117 | */ |
| 118 | struct mon_bin_isodesc { |
| 119 | int iso_status; |
| 120 | unsigned int iso_off; |
| 121 | unsigned int iso_len; |
| 122 | u32 _pad; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 123 | }; |
| 124 | |
| 125 | /* per file statistic */ |
| 126 | struct mon_bin_stats { |
| 127 | u32 queued; |
| 128 | u32 dropped; |
| 129 | }; |
| 130 | |
| 131 | struct mon_bin_get { |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 132 | struct mon_bin_hdr __user *hdr; /* Can be 48 bytes or 64. */ |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 133 | void __user *data; |
| 134 | size_t alloc; /* Length of data (can be zero) */ |
| 135 | }; |
| 136 | |
| 137 | struct mon_bin_mfetch { |
| 138 | u32 __user *offvec; /* Vector of events fetched */ |
| 139 | u32 nfetch; /* Number of events to fetch (out: fetched) */ |
| 140 | u32 nflush; /* Number of events to flush */ |
| 141 | }; |
| 142 | |
| 143 | #ifdef CONFIG_COMPAT |
| 144 | struct mon_bin_get32 { |
| 145 | u32 hdr32; |
| 146 | u32 data32; |
| 147 | u32 alloc32; |
| 148 | }; |
| 149 | |
| 150 | struct mon_bin_mfetch32 { |
| 151 | u32 offvec32; |
| 152 | u32 nfetch32; |
| 153 | u32 nflush32; |
| 154 | }; |
| 155 | #endif |
| 156 | |
| 157 | /* Having these two values same prevents wrapping of the mon_bin_hdr */ |
| 158 | #define PKT_ALIGN 64 |
| 159 | #define PKT_SIZE 64 |
| 160 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 161 | #define PKT_SZ_API0 48 /* API 0 (2.6.20) size */ |
| 162 | #define PKT_SZ_API1 64 /* API 1 size: extra fields */ |
| 163 | |
| 164 | #define ISODESC_MAX 128 /* Same number as usbfs allows, 2048 bytes. */ |
| 165 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 166 | /* max number of USB bus supported */ |
| 167 | #define MON_BIN_MAX_MINOR 128 |
| 168 | |
| 169 | /* |
| 170 | * The buffer: map of used pages. |
| 171 | */ |
| 172 | struct mon_pgmap { |
| 173 | struct page *pg; |
| 174 | unsigned char *ptr; /* XXX just use page_to_virt everywhere? */ |
| 175 | }; |
| 176 | |
| 177 | /* |
| 178 | * This gets associated with an open file struct. |
| 179 | */ |
| 180 | struct mon_reader_bin { |
| 181 | /* The buffer: one per open. */ |
| 182 | spinlock_t b_lock; /* Protect b_cnt, b_in */ |
| 183 | unsigned int b_size; /* Current size of the buffer - bytes */ |
| 184 | unsigned int b_cnt; /* Bytes used */ |
| 185 | unsigned int b_in, b_out; /* Offsets into buffer - bytes */ |
| 186 | unsigned int b_read; /* Amount of read data in curr. pkt. */ |
| 187 | struct mon_pgmap *b_vec; /* The map array */ |
| 188 | wait_queue_head_t b_wait; /* Wait for data here */ |
| 189 | |
| 190 | struct mutex fetch_lock; /* Protect b_read, b_out */ |
| 191 | int mmap_active; |
| 192 | |
| 193 | /* A list of these is needed for "bus 0". Some time later. */ |
| 194 | struct mon_reader r; |
| 195 | |
| 196 | /* Stats */ |
| 197 | unsigned int cnt_lost; |
| 198 | }; |
| 199 | |
| 200 | static inline struct mon_bin_hdr *MON_OFF2HDR(const struct mon_reader_bin *rp, |
| 201 | unsigned int offset) |
| 202 | { |
| 203 | return (struct mon_bin_hdr *) |
| 204 | (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE); |
| 205 | } |
| 206 | |
| 207 | #define MON_RING_EMPTY(rp) ((rp)->b_cnt == 0) |
| 208 | |
Pete Zaitcev | 30c7431 | 2007-08-14 00:33:40 -0700 | [diff] [blame] | 209 | static unsigned char xfer_to_pipe[4] = { |
| 210 | PIPE_CONTROL, PIPE_ISOCHRONOUS, PIPE_BULK, PIPE_INTERRUPT |
| 211 | }; |
| 212 | |
Pete Zaitcev | ce7cd137f | 2007-05-03 16:51:16 -0700 | [diff] [blame] | 213 | static struct class *mon_bin_class; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 214 | static dev_t mon_bin_dev0; |
| 215 | static struct cdev mon_bin_cdev; |
| 216 | |
| 217 | static void mon_buff_area_fill(const struct mon_reader_bin *rp, |
| 218 | unsigned int offset, unsigned int size); |
| 219 | static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp); |
| 220 | static int mon_alloc_buff(struct mon_pgmap *map, int npages); |
| 221 | static void mon_free_buff(struct mon_pgmap *map, int npages); |
| 222 | |
| 223 | /* |
| 224 | * This is a "chunked memcpy". It does not manipulate any counters. |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 225 | */ |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 226 | static unsigned int mon_copy_to_buff(const struct mon_reader_bin *this, |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 227 | unsigned int off, const unsigned char *from, unsigned int length) |
| 228 | { |
| 229 | unsigned int step_len; |
| 230 | unsigned char *buf; |
| 231 | unsigned int in_page; |
| 232 | |
| 233 | while (length) { |
| 234 | /* |
| 235 | * Determine step_len. |
| 236 | */ |
| 237 | step_len = length; |
| 238 | in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1)); |
| 239 | if (in_page < step_len) |
| 240 | step_len = in_page; |
| 241 | |
| 242 | /* |
| 243 | * Copy data and advance pointers. |
| 244 | */ |
| 245 | buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE; |
| 246 | memcpy(buf, from, step_len); |
| 247 | if ((off += step_len) >= this->b_size) off = 0; |
| 248 | from += step_len; |
| 249 | length -= step_len; |
| 250 | } |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 251 | return off; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | /* |
| 255 | * This is a little worse than the above because it's "chunked copy_to_user". |
| 256 | * The return value is an error code, not an offset. |
| 257 | */ |
| 258 | static int copy_from_buf(const struct mon_reader_bin *this, unsigned int off, |
| 259 | char __user *to, int length) |
| 260 | { |
| 261 | unsigned int step_len; |
| 262 | unsigned char *buf; |
| 263 | unsigned int in_page; |
| 264 | |
| 265 | while (length) { |
| 266 | /* |
| 267 | * Determine step_len. |
| 268 | */ |
| 269 | step_len = length; |
| 270 | in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1)); |
| 271 | if (in_page < step_len) |
| 272 | step_len = in_page; |
| 273 | |
| 274 | /* |
| 275 | * Copy data and advance pointers. |
| 276 | */ |
| 277 | buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE; |
| 278 | if (copy_to_user(to, buf, step_len)) |
| 279 | return -EINVAL; |
| 280 | if ((off += step_len) >= this->b_size) off = 0; |
| 281 | to += step_len; |
| 282 | length -= step_len; |
| 283 | } |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * Allocate an (aligned) area in the buffer. |
| 289 | * This is called under b_lock. |
| 290 | * Returns ~0 on failure. |
| 291 | */ |
| 292 | static unsigned int mon_buff_area_alloc(struct mon_reader_bin *rp, |
| 293 | unsigned int size) |
| 294 | { |
| 295 | unsigned int offset; |
| 296 | |
| 297 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
| 298 | if (rp->b_cnt + size > rp->b_size) |
| 299 | return ~0; |
| 300 | offset = rp->b_in; |
| 301 | rp->b_cnt += size; |
| 302 | if ((rp->b_in += size) >= rp->b_size) |
| 303 | rp->b_in -= rp->b_size; |
| 304 | return offset; |
| 305 | } |
| 306 | |
| 307 | /* |
| 308 | * This is the same thing as mon_buff_area_alloc, only it does not allow |
| 309 | * buffers to wrap. This is needed by applications which pass references |
| 310 | * into mmap-ed buffers up their stacks (libpcap can do that). |
| 311 | * |
| 312 | * Currently, we always have the header stuck with the data, although |
| 313 | * it is not strictly speaking necessary. |
| 314 | * |
| 315 | * When a buffer would wrap, we place a filler packet to mark the space. |
| 316 | */ |
| 317 | static unsigned int mon_buff_area_alloc_contiguous(struct mon_reader_bin *rp, |
| 318 | unsigned int size) |
| 319 | { |
| 320 | unsigned int offset; |
| 321 | unsigned int fill_size; |
| 322 | |
| 323 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
| 324 | if (rp->b_cnt + size > rp->b_size) |
| 325 | return ~0; |
| 326 | if (rp->b_in + size > rp->b_size) { |
| 327 | /* |
| 328 | * This would wrap. Find if we still have space after |
| 329 | * skipping to the end of the buffer. If we do, place |
| 330 | * a filler packet and allocate a new packet. |
| 331 | */ |
| 332 | fill_size = rp->b_size - rp->b_in; |
| 333 | if (rp->b_cnt + size + fill_size > rp->b_size) |
| 334 | return ~0; |
| 335 | mon_buff_area_fill(rp, rp->b_in, fill_size); |
| 336 | |
| 337 | offset = 0; |
| 338 | rp->b_in = size; |
| 339 | rp->b_cnt += size + fill_size; |
| 340 | } else if (rp->b_in + size == rp->b_size) { |
| 341 | offset = rp->b_in; |
| 342 | rp->b_in = 0; |
| 343 | rp->b_cnt += size; |
| 344 | } else { |
| 345 | offset = rp->b_in; |
| 346 | rp->b_in += size; |
| 347 | rp->b_cnt += size; |
| 348 | } |
| 349 | return offset; |
| 350 | } |
| 351 | |
| 352 | /* |
| 353 | * Return a few (kilo-)bytes to the head of the buffer. |
Alan Stern | fca9474 | 2009-11-04 11:35:53 -0500 | [diff] [blame] | 354 | * This is used if a data fetch fails. |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 355 | */ |
| 356 | static void mon_buff_area_shrink(struct mon_reader_bin *rp, unsigned int size) |
| 357 | { |
| 358 | |
Alan Stern | fca9474 | 2009-11-04 11:35:53 -0500 | [diff] [blame] | 359 | /* size &= ~(PKT_ALIGN-1); -- we're called with aligned size */ |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 360 | rp->b_cnt -= size; |
| 361 | if (rp->b_in < size) |
| 362 | rp->b_in += rp->b_size; |
| 363 | rp->b_in -= size; |
| 364 | } |
| 365 | |
| 366 | /* |
| 367 | * This has to be called under both b_lock and fetch_lock, because |
| 368 | * it accesses both b_cnt and b_out. |
| 369 | */ |
| 370 | static void mon_buff_area_free(struct mon_reader_bin *rp, unsigned int size) |
| 371 | { |
| 372 | |
| 373 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
| 374 | rp->b_cnt -= size; |
| 375 | if ((rp->b_out += size) >= rp->b_size) |
| 376 | rp->b_out -= rp->b_size; |
| 377 | } |
| 378 | |
| 379 | static void mon_buff_area_fill(const struct mon_reader_bin *rp, |
| 380 | unsigned int offset, unsigned int size) |
| 381 | { |
| 382 | struct mon_bin_hdr *ep; |
| 383 | |
| 384 | ep = MON_OFF2HDR(rp, offset); |
| 385 | memset(ep, 0, PKT_SIZE); |
| 386 | ep->type = '@'; |
| 387 | ep->len_cap = size - PKT_SIZE; |
| 388 | } |
| 389 | |
| 390 | static inline char mon_bin_get_setup(unsigned char *setupb, |
| 391 | const struct urb *urb, char ev_type) |
| 392 | { |
| 393 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 394 | if (urb->setup_packet == NULL) |
| 395 | return 'Z'; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 396 | memcpy(setupb, urb->setup_packet, SETUP_LEN); |
| 397 | return 0; |
| 398 | } |
| 399 | |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 400 | static unsigned int mon_bin_get_data(const struct mon_reader_bin *rp, |
| 401 | unsigned int offset, struct urb *urb, unsigned int length, |
| 402 | char *flag) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 403 | { |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 404 | int i; |
| 405 | struct scatterlist *sg; |
| 406 | unsigned int this_len; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 407 | |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 408 | *flag = 0; |
| 409 | if (urb->num_sgs == 0) { |
| 410 | if (urb->transfer_buffer == NULL) { |
| 411 | *flag = 'Z'; |
| 412 | return length; |
| 413 | } |
| 414 | mon_copy_to_buff(rp, offset, urb->transfer_buffer, length); |
| 415 | length = 0; |
| 416 | |
| 417 | } else { |
| 418 | /* If IOMMU coalescing occurred, we cannot trust sg_page */ |
| 419 | if (urb->sg->nents != urb->num_sgs) { |
| 420 | *flag = 'D'; |
| 421 | return length; |
| 422 | } |
| 423 | |
| 424 | /* Copy up to the first non-addressable segment */ |
| 425 | for_each_sg(urb->sg->sg, sg, urb->num_sgs, i) { |
| 426 | if (length == 0 || PageHighMem(sg_page(sg))) |
| 427 | break; |
| 428 | this_len = min_t(unsigned int, sg->length, length); |
| 429 | offset = mon_copy_to_buff(rp, offset, sg_virt(sg), |
| 430 | this_len); |
| 431 | length -= this_len; |
| 432 | } |
| 433 | if (i == 0) |
| 434 | *flag = 'D'; |
| 435 | } |
| 436 | |
| 437 | return length; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 438 | } |
| 439 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 440 | static void mon_bin_get_isodesc(const struct mon_reader_bin *rp, |
| 441 | unsigned int offset, struct urb *urb, char ev_type, unsigned int ndesc) |
| 442 | { |
| 443 | struct mon_bin_isodesc *dp; |
| 444 | struct usb_iso_packet_descriptor *fp; |
| 445 | |
| 446 | fp = urb->iso_frame_desc; |
| 447 | while (ndesc-- != 0) { |
| 448 | dp = (struct mon_bin_isodesc *) |
| 449 | (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE); |
| 450 | dp->iso_status = fp->status; |
| 451 | dp->iso_off = fp->offset; |
| 452 | dp->iso_len = (ev_type == 'S') ? fp->length : fp->actual_length; |
| 453 | dp->_pad = 0; |
| 454 | if ((offset += sizeof(struct mon_bin_isodesc)) >= rp->b_size) |
| 455 | offset = 0; |
| 456 | fp++; |
| 457 | } |
| 458 | } |
| 459 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 460 | static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb, |
Alan Stern | 9347d51 | 2007-08-24 15:41:41 -0400 | [diff] [blame] | 461 | char ev_type, int status) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 462 | { |
Pete Zaitcev | 30c7431 | 2007-08-14 00:33:40 -0700 | [diff] [blame] | 463 | const struct usb_endpoint_descriptor *epd = &urb->ep->desc; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 464 | struct timeval ts; |
Pete Zaitcev | 2bc0d109 | 2010-01-05 11:50:07 -0700 | [diff] [blame] | 465 | unsigned long flags; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 466 | unsigned int urb_length; |
| 467 | unsigned int offset; |
| 468 | unsigned int length; |
Alan Stern | fca9474 | 2009-11-04 11:35:53 -0500 | [diff] [blame] | 469 | unsigned int delta; |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 470 | unsigned int ndesc, lendesc; |
Pete Zaitcev | 30c7431 | 2007-08-14 00:33:40 -0700 | [diff] [blame] | 471 | unsigned char dir; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 472 | struct mon_bin_hdr *ep; |
| 473 | char data_tag = 0; |
| 474 | |
| 475 | do_gettimeofday(&ts); |
| 476 | |
| 477 | spin_lock_irqsave(&rp->b_lock, flags); |
| 478 | |
| 479 | /* |
| 480 | * Find the maximum allowable length, then allocate space. |
| 481 | */ |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 482 | if (usb_endpoint_xfer_isoc(epd)) { |
| 483 | if (urb->number_of_packets < 0) { |
| 484 | ndesc = 0; |
| 485 | } else if (urb->number_of_packets >= ISODESC_MAX) { |
| 486 | ndesc = ISODESC_MAX; |
| 487 | } else { |
| 488 | ndesc = urb->number_of_packets; |
| 489 | } |
| 490 | } else { |
| 491 | ndesc = 0; |
| 492 | } |
| 493 | lendesc = ndesc*sizeof(struct mon_bin_isodesc); |
| 494 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 495 | urb_length = (ev_type == 'S') ? |
| 496 | urb->transfer_buffer_length : urb->actual_length; |
| 497 | length = urb_length; |
| 498 | |
| 499 | if (length >= rp->b_size/5) |
| 500 | length = rp->b_size/5; |
| 501 | |
Alan Stern | 18ea5d0 | 2007-07-30 17:10:36 -0400 | [diff] [blame] | 502 | if (usb_urb_dir_in(urb)) { |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 503 | if (ev_type == 'S') { |
| 504 | length = 0; |
| 505 | data_tag = '<'; |
| 506 | } |
Pete Zaitcev | 30c7431 | 2007-08-14 00:33:40 -0700 | [diff] [blame] | 507 | /* Cannot rely on endpoint number in case of control ep.0 */ |
| 508 | dir = USB_DIR_IN; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 509 | } else { |
| 510 | if (ev_type == 'C') { |
| 511 | length = 0; |
| 512 | data_tag = '>'; |
| 513 | } |
Pete Zaitcev | 30c7431 | 2007-08-14 00:33:40 -0700 | [diff] [blame] | 514 | dir = 0; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 515 | } |
| 516 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 517 | if (rp->mmap_active) { |
| 518 | offset = mon_buff_area_alloc_contiguous(rp, |
| 519 | length + PKT_SIZE + lendesc); |
| 520 | } else { |
| 521 | offset = mon_buff_area_alloc(rp, length + PKT_SIZE + lendesc); |
| 522 | } |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 523 | if (offset == ~0) { |
| 524 | rp->cnt_lost++; |
| 525 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 526 | return; |
| 527 | } |
| 528 | |
| 529 | ep = MON_OFF2HDR(rp, offset); |
| 530 | if ((offset += PKT_SIZE) >= rp->b_size) offset = 0; |
| 531 | |
| 532 | /* |
| 533 | * Fill the allocated area. |
| 534 | */ |
| 535 | memset(ep, 0, PKT_SIZE); |
| 536 | ep->type = ev_type; |
Pete Zaitcev | 30c7431 | 2007-08-14 00:33:40 -0700 | [diff] [blame] | 537 | ep->xfer_type = xfer_to_pipe[usb_endpoint_type(epd)]; |
| 538 | ep->epnum = dir | usb_endpoint_num(epd); |
Alan Stern | 18ea5d0 | 2007-07-30 17:10:36 -0400 | [diff] [blame] | 539 | ep->devnum = urb->dev->devnum; |
Pete Zaitcev | ecb658d | 2007-04-11 13:47:26 -0700 | [diff] [blame] | 540 | ep->busnum = urb->dev->bus->busnum; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 541 | ep->id = (unsigned long) urb; |
| 542 | ep->ts_sec = ts.tv_sec; |
| 543 | ep->ts_usec = ts.tv_usec; |
Alan Stern | 9347d51 | 2007-08-24 15:41:41 -0400 | [diff] [blame] | 544 | ep->status = status; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 545 | ep->len_urb = urb_length; |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 546 | ep->len_cap = length + lendesc; |
| 547 | ep->xfer_flags = urb->transfer_flags; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 548 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 549 | if (usb_endpoint_xfer_int(epd)) { |
| 550 | ep->interval = urb->interval; |
| 551 | } else if (usb_endpoint_xfer_isoc(epd)) { |
| 552 | ep->interval = urb->interval; |
| 553 | ep->start_frame = urb->start_frame; |
| 554 | ep->s.iso.error_count = urb->error_count; |
| 555 | ep->s.iso.numdesc = urb->number_of_packets; |
| 556 | } |
| 557 | |
| 558 | if (usb_endpoint_xfer_control(epd) && ev_type == 'S') { |
| 559 | ep->flag_setup = mon_bin_get_setup(ep->s.setup, urb, ev_type); |
| 560 | } else { |
| 561 | ep->flag_setup = '-'; |
| 562 | } |
| 563 | |
| 564 | if (ndesc != 0) { |
| 565 | ep->ndesc = ndesc; |
| 566 | mon_bin_get_isodesc(rp, offset, urb, ev_type, ndesc); |
| 567 | if ((offset += lendesc) >= rp->b_size) |
| 568 | offset -= rp->b_size; |
| 569 | } |
| 570 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 571 | if (length != 0) { |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 572 | length = mon_bin_get_data(rp, offset, urb, length, |
| 573 | &ep->flag_data); |
| 574 | if (length > 0) { |
Alan Stern | fca9474 | 2009-11-04 11:35:53 -0500 | [diff] [blame] | 575 | delta = (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
| 576 | ep->len_cap -= length; |
| 577 | delta -= (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
| 578 | mon_buff_area_shrink(rp, delta); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 579 | } |
| 580 | } else { |
| 581 | ep->flag_data = data_tag; |
| 582 | } |
| 583 | |
| 584 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 585 | |
| 586 | wake_up(&rp->b_wait); |
| 587 | } |
| 588 | |
| 589 | static void mon_bin_submit(void *data, struct urb *urb) |
| 590 | { |
| 591 | struct mon_reader_bin *rp = data; |
Alan Stern | 9347d51 | 2007-08-24 15:41:41 -0400 | [diff] [blame] | 592 | mon_bin_event(rp, urb, 'S', -EINPROGRESS); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 593 | } |
| 594 | |
Alan Stern | 9347d51 | 2007-08-24 15:41:41 -0400 | [diff] [blame] | 595 | static void mon_bin_complete(void *data, struct urb *urb, int status) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 596 | { |
| 597 | struct mon_reader_bin *rp = data; |
Alan Stern | 9347d51 | 2007-08-24 15:41:41 -0400 | [diff] [blame] | 598 | mon_bin_event(rp, urb, 'C', status); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 599 | } |
| 600 | |
| 601 | static void mon_bin_error(void *data, struct urb *urb, int error) |
| 602 | { |
| 603 | struct mon_reader_bin *rp = data; |
Pete Zaitcev | 2bc0d109 | 2010-01-05 11:50:07 -0700 | [diff] [blame] | 604 | struct timeval ts; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 605 | unsigned long flags; |
| 606 | unsigned int offset; |
| 607 | struct mon_bin_hdr *ep; |
| 608 | |
Pete Zaitcev | 2bc0d109 | 2010-01-05 11:50:07 -0700 | [diff] [blame] | 609 | do_gettimeofday(&ts); |
| 610 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 611 | spin_lock_irqsave(&rp->b_lock, flags); |
| 612 | |
| 613 | offset = mon_buff_area_alloc(rp, PKT_SIZE); |
| 614 | if (offset == ~0) { |
| 615 | /* Not incrementing cnt_lost. Just because. */ |
| 616 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 617 | return; |
| 618 | } |
| 619 | |
| 620 | ep = MON_OFF2HDR(rp, offset); |
| 621 | |
| 622 | memset(ep, 0, PKT_SIZE); |
| 623 | ep->type = 'E'; |
Pete Zaitcev | 30c7431 | 2007-08-14 00:33:40 -0700 | [diff] [blame] | 624 | ep->xfer_type = xfer_to_pipe[usb_endpoint_type(&urb->ep->desc)]; |
| 625 | ep->epnum = usb_urb_dir_in(urb) ? USB_DIR_IN : 0; |
| 626 | ep->epnum |= usb_endpoint_num(&urb->ep->desc); |
Alan Stern | 18ea5d0 | 2007-07-30 17:10:36 -0400 | [diff] [blame] | 627 | ep->devnum = urb->dev->devnum; |
Pete Zaitcev | ecb658d | 2007-04-11 13:47:26 -0700 | [diff] [blame] | 628 | ep->busnum = urb->dev->bus->busnum; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 629 | ep->id = (unsigned long) urb; |
Pete Zaitcev | 2bc0d109 | 2010-01-05 11:50:07 -0700 | [diff] [blame] | 630 | ep->ts_sec = ts.tv_sec; |
| 631 | ep->ts_usec = ts.tv_usec; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 632 | ep->status = error; |
| 633 | |
| 634 | ep->flag_setup = '-'; |
| 635 | ep->flag_data = 'E'; |
| 636 | |
| 637 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 638 | |
| 639 | wake_up(&rp->b_wait); |
| 640 | } |
| 641 | |
| 642 | static int mon_bin_open(struct inode *inode, struct file *file) |
| 643 | { |
| 644 | struct mon_bus *mbus; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 645 | struct mon_reader_bin *rp; |
| 646 | size_t size; |
| 647 | int rc; |
| 648 | |
Jonathan Corbet | 1af46fd | 2008-05-16 14:23:31 -0600 | [diff] [blame] | 649 | lock_kernel(); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 650 | mutex_lock(&mon_lock); |
| 651 | if ((mbus = mon_bus_lookup(iminor(inode))) == NULL) { |
| 652 | mutex_unlock(&mon_lock); |
Jonathan Corbet | 1af46fd | 2008-05-16 14:23:31 -0600 | [diff] [blame] | 653 | unlock_kernel(); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 654 | return -ENODEV; |
| 655 | } |
Pete Zaitcev | ecb658d | 2007-04-11 13:47:26 -0700 | [diff] [blame] | 656 | if (mbus != &mon_bus0 && mbus->u_bus == NULL) { |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 657 | printk(KERN_ERR TAG ": consistency error on open\n"); |
| 658 | mutex_unlock(&mon_lock); |
Jonathan Corbet | 1af46fd | 2008-05-16 14:23:31 -0600 | [diff] [blame] | 659 | unlock_kernel(); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 660 | return -ENODEV; |
| 661 | } |
| 662 | |
| 663 | rp = kzalloc(sizeof(struct mon_reader_bin), GFP_KERNEL); |
| 664 | if (rp == NULL) { |
| 665 | rc = -ENOMEM; |
| 666 | goto err_alloc; |
| 667 | } |
| 668 | spin_lock_init(&rp->b_lock); |
| 669 | init_waitqueue_head(&rp->b_wait); |
| 670 | mutex_init(&rp->fetch_lock); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 671 | rp->b_size = BUFF_DFL; |
| 672 | |
| 673 | size = sizeof(struct mon_pgmap) * (rp->b_size/CHUNK_SIZE); |
| 674 | if ((rp->b_vec = kzalloc(size, GFP_KERNEL)) == NULL) { |
| 675 | rc = -ENOMEM; |
| 676 | goto err_allocvec; |
| 677 | } |
| 678 | |
| 679 | if ((rc = mon_alloc_buff(rp->b_vec, rp->b_size/CHUNK_SIZE)) < 0) |
| 680 | goto err_allocbuff; |
| 681 | |
| 682 | rp->r.m_bus = mbus; |
| 683 | rp->r.r_data = rp; |
| 684 | rp->r.rnf_submit = mon_bin_submit; |
| 685 | rp->r.rnf_error = mon_bin_error; |
| 686 | rp->r.rnf_complete = mon_bin_complete; |
| 687 | |
| 688 | mon_reader_add(mbus, &rp->r); |
| 689 | |
| 690 | file->private_data = rp; |
| 691 | mutex_unlock(&mon_lock); |
Jonathan Corbet | 1af46fd | 2008-05-16 14:23:31 -0600 | [diff] [blame] | 692 | unlock_kernel(); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 693 | return 0; |
| 694 | |
| 695 | err_allocbuff: |
| 696 | kfree(rp->b_vec); |
| 697 | err_allocvec: |
| 698 | kfree(rp); |
| 699 | err_alloc: |
| 700 | mutex_unlock(&mon_lock); |
Jonathan Corbet | 1af46fd | 2008-05-16 14:23:31 -0600 | [diff] [blame] | 701 | unlock_kernel(); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 702 | return rc; |
| 703 | } |
| 704 | |
| 705 | /* |
| 706 | * Extract an event from buffer and copy it to user space. |
| 707 | * Wait if there is no event ready. |
| 708 | * Returns zero or error. |
| 709 | */ |
| 710 | static int mon_bin_get_event(struct file *file, struct mon_reader_bin *rp, |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 711 | struct mon_bin_hdr __user *hdr, unsigned int hdrbytes, |
| 712 | void __user *data, unsigned int nbytes) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 713 | { |
| 714 | unsigned long flags; |
| 715 | struct mon_bin_hdr *ep; |
| 716 | size_t step_len; |
| 717 | unsigned int offset; |
| 718 | int rc; |
| 719 | |
| 720 | mutex_lock(&rp->fetch_lock); |
| 721 | |
| 722 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { |
| 723 | mutex_unlock(&rp->fetch_lock); |
| 724 | return rc; |
| 725 | } |
| 726 | |
| 727 | ep = MON_OFF2HDR(rp, rp->b_out); |
| 728 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 729 | if (copy_to_user(hdr, ep, hdrbytes)) { |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 730 | mutex_unlock(&rp->fetch_lock); |
| 731 | return -EFAULT; |
| 732 | } |
| 733 | |
| 734 | step_len = min(ep->len_cap, nbytes); |
| 735 | if ((offset = rp->b_out + PKT_SIZE) >= rp->b_size) offset = 0; |
| 736 | |
| 737 | if (copy_from_buf(rp, offset, data, step_len)) { |
| 738 | mutex_unlock(&rp->fetch_lock); |
| 739 | return -EFAULT; |
| 740 | } |
| 741 | |
| 742 | spin_lock_irqsave(&rp->b_lock, flags); |
| 743 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); |
| 744 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 745 | rp->b_read = 0; |
| 746 | |
| 747 | mutex_unlock(&rp->fetch_lock); |
| 748 | return 0; |
| 749 | } |
| 750 | |
| 751 | static int mon_bin_release(struct inode *inode, struct file *file) |
| 752 | { |
| 753 | struct mon_reader_bin *rp = file->private_data; |
| 754 | struct mon_bus* mbus = rp->r.m_bus; |
| 755 | |
| 756 | mutex_lock(&mon_lock); |
| 757 | |
| 758 | if (mbus->nreaders <= 0) { |
| 759 | printk(KERN_ERR TAG ": consistency error on close\n"); |
| 760 | mutex_unlock(&mon_lock); |
| 761 | return 0; |
| 762 | } |
| 763 | mon_reader_del(mbus, &rp->r); |
| 764 | |
| 765 | mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE); |
| 766 | kfree(rp->b_vec); |
| 767 | kfree(rp); |
| 768 | |
| 769 | mutex_unlock(&mon_lock); |
| 770 | return 0; |
| 771 | } |
| 772 | |
| 773 | static ssize_t mon_bin_read(struct file *file, char __user *buf, |
| 774 | size_t nbytes, loff_t *ppos) |
| 775 | { |
| 776 | struct mon_reader_bin *rp = file->private_data; |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 777 | unsigned int hdrbytes = PKT_SZ_API0; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 778 | unsigned long flags; |
| 779 | struct mon_bin_hdr *ep; |
| 780 | unsigned int offset; |
| 781 | size_t step_len; |
| 782 | char *ptr; |
| 783 | ssize_t done = 0; |
| 784 | int rc; |
| 785 | |
| 786 | mutex_lock(&rp->fetch_lock); |
| 787 | |
| 788 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { |
| 789 | mutex_unlock(&rp->fetch_lock); |
| 790 | return rc; |
| 791 | } |
| 792 | |
| 793 | ep = MON_OFF2HDR(rp, rp->b_out); |
| 794 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 795 | if (rp->b_read < hdrbytes) { |
| 796 | step_len = min(nbytes, (size_t)(hdrbytes - rp->b_read)); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 797 | ptr = ((char *)ep) + rp->b_read; |
| 798 | if (step_len && copy_to_user(buf, ptr, step_len)) { |
| 799 | mutex_unlock(&rp->fetch_lock); |
| 800 | return -EFAULT; |
| 801 | } |
| 802 | nbytes -= step_len; |
| 803 | buf += step_len; |
| 804 | rp->b_read += step_len; |
| 805 | done += step_len; |
| 806 | } |
| 807 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 808 | if (rp->b_read >= hdrbytes) { |
Pete Zaitcev | f1c0a2a | 2008-11-14 09:47:41 -0700 | [diff] [blame] | 809 | step_len = ep->len_cap; |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 810 | step_len -= rp->b_read - hdrbytes; |
Pete Zaitcev | f1c0a2a | 2008-11-14 09:47:41 -0700 | [diff] [blame] | 811 | if (step_len > nbytes) |
| 812 | step_len = nbytes; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 813 | offset = rp->b_out + PKT_SIZE; |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 814 | offset += rp->b_read - hdrbytes; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 815 | if (offset >= rp->b_size) |
| 816 | offset -= rp->b_size; |
| 817 | if (copy_from_buf(rp, offset, buf, step_len)) { |
| 818 | mutex_unlock(&rp->fetch_lock); |
| 819 | return -EFAULT; |
| 820 | } |
| 821 | nbytes -= step_len; |
| 822 | buf += step_len; |
| 823 | rp->b_read += step_len; |
| 824 | done += step_len; |
| 825 | } |
| 826 | |
| 827 | /* |
| 828 | * Check if whole packet was read, and if so, jump to the next one. |
| 829 | */ |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 830 | if (rp->b_read >= hdrbytes + ep->len_cap) { |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 831 | spin_lock_irqsave(&rp->b_lock, flags); |
| 832 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); |
| 833 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 834 | rp->b_read = 0; |
| 835 | } |
| 836 | |
| 837 | mutex_unlock(&rp->fetch_lock); |
| 838 | return done; |
| 839 | } |
| 840 | |
| 841 | /* |
| 842 | * Remove at most nevents from chunked buffer. |
| 843 | * Returns the number of removed events. |
| 844 | */ |
| 845 | static int mon_bin_flush(struct mon_reader_bin *rp, unsigned nevents) |
| 846 | { |
| 847 | unsigned long flags; |
| 848 | struct mon_bin_hdr *ep; |
| 849 | int i; |
| 850 | |
| 851 | mutex_lock(&rp->fetch_lock); |
| 852 | spin_lock_irqsave(&rp->b_lock, flags); |
| 853 | for (i = 0; i < nevents; ++i) { |
| 854 | if (MON_RING_EMPTY(rp)) |
| 855 | break; |
| 856 | |
| 857 | ep = MON_OFF2HDR(rp, rp->b_out); |
| 858 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); |
| 859 | } |
| 860 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 861 | rp->b_read = 0; |
| 862 | mutex_unlock(&rp->fetch_lock); |
| 863 | return i; |
| 864 | } |
| 865 | |
| 866 | /* |
| 867 | * Fetch at most max event offsets into the buffer and put them into vec. |
| 868 | * The events are usually freed later with mon_bin_flush. |
| 869 | * Return the effective number of events fetched. |
| 870 | */ |
| 871 | static int mon_bin_fetch(struct file *file, struct mon_reader_bin *rp, |
| 872 | u32 __user *vec, unsigned int max) |
| 873 | { |
| 874 | unsigned int cur_out; |
| 875 | unsigned int bytes, avail; |
| 876 | unsigned int size; |
| 877 | unsigned int nevents; |
| 878 | struct mon_bin_hdr *ep; |
| 879 | unsigned long flags; |
| 880 | int rc; |
| 881 | |
| 882 | mutex_lock(&rp->fetch_lock); |
| 883 | |
| 884 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { |
| 885 | mutex_unlock(&rp->fetch_lock); |
| 886 | return rc; |
| 887 | } |
| 888 | |
| 889 | spin_lock_irqsave(&rp->b_lock, flags); |
| 890 | avail = rp->b_cnt; |
| 891 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 892 | |
| 893 | cur_out = rp->b_out; |
| 894 | nevents = 0; |
| 895 | bytes = 0; |
| 896 | while (bytes < avail) { |
| 897 | if (nevents >= max) |
| 898 | break; |
| 899 | |
| 900 | ep = MON_OFF2HDR(rp, cur_out); |
| 901 | if (put_user(cur_out, &vec[nevents])) { |
| 902 | mutex_unlock(&rp->fetch_lock); |
| 903 | return -EFAULT; |
| 904 | } |
| 905 | |
| 906 | nevents++; |
| 907 | size = ep->len_cap + PKT_SIZE; |
| 908 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
| 909 | if ((cur_out += size) >= rp->b_size) |
| 910 | cur_out -= rp->b_size; |
| 911 | bytes += size; |
| 912 | } |
| 913 | |
| 914 | mutex_unlock(&rp->fetch_lock); |
| 915 | return nevents; |
| 916 | } |
| 917 | |
| 918 | /* |
| 919 | * Count events. This is almost the same as the above mon_bin_fetch, |
| 920 | * only we do not store offsets into user vector, and we have no limit. |
| 921 | */ |
| 922 | static int mon_bin_queued(struct mon_reader_bin *rp) |
| 923 | { |
| 924 | unsigned int cur_out; |
| 925 | unsigned int bytes, avail; |
| 926 | unsigned int size; |
| 927 | unsigned int nevents; |
| 928 | struct mon_bin_hdr *ep; |
| 929 | unsigned long flags; |
| 930 | |
| 931 | mutex_lock(&rp->fetch_lock); |
| 932 | |
| 933 | spin_lock_irqsave(&rp->b_lock, flags); |
| 934 | avail = rp->b_cnt; |
| 935 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 936 | |
| 937 | cur_out = rp->b_out; |
| 938 | nevents = 0; |
| 939 | bytes = 0; |
| 940 | while (bytes < avail) { |
| 941 | ep = MON_OFF2HDR(rp, cur_out); |
| 942 | |
| 943 | nevents++; |
| 944 | size = ep->len_cap + PKT_SIZE; |
| 945 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
| 946 | if ((cur_out += size) >= rp->b_size) |
| 947 | cur_out -= rp->b_size; |
| 948 | bytes += size; |
| 949 | } |
| 950 | |
| 951 | mutex_unlock(&rp->fetch_lock); |
| 952 | return nevents; |
| 953 | } |
| 954 | |
| 955 | /* |
| 956 | */ |
| 957 | static int mon_bin_ioctl(struct inode *inode, struct file *file, |
| 958 | unsigned int cmd, unsigned long arg) |
| 959 | { |
| 960 | struct mon_reader_bin *rp = file->private_data; |
| 961 | // struct mon_bus* mbus = rp->r.m_bus; |
| 962 | int ret = 0; |
| 963 | struct mon_bin_hdr *ep; |
| 964 | unsigned long flags; |
| 965 | |
| 966 | switch (cmd) { |
| 967 | |
| 968 | case MON_IOCQ_URB_LEN: |
| 969 | /* |
| 970 | * N.B. This only returns the size of data, without the header. |
| 971 | */ |
| 972 | spin_lock_irqsave(&rp->b_lock, flags); |
| 973 | if (!MON_RING_EMPTY(rp)) { |
| 974 | ep = MON_OFF2HDR(rp, rp->b_out); |
| 975 | ret = ep->len_cap; |
| 976 | } |
| 977 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 978 | break; |
| 979 | |
| 980 | case MON_IOCQ_RING_SIZE: |
| 981 | ret = rp->b_size; |
| 982 | break; |
| 983 | |
| 984 | case MON_IOCT_RING_SIZE: |
| 985 | /* |
| 986 | * Changing the buffer size will flush it's contents; the new |
| 987 | * buffer is allocated before releasing the old one to be sure |
| 988 | * the device will stay functional also in case of memory |
| 989 | * pressure. |
| 990 | */ |
| 991 | { |
| 992 | int size; |
| 993 | struct mon_pgmap *vec; |
| 994 | |
| 995 | if (arg < BUFF_MIN || arg > BUFF_MAX) |
| 996 | return -EINVAL; |
| 997 | |
| 998 | size = CHUNK_ALIGN(arg); |
| 999 | if ((vec = kzalloc(sizeof(struct mon_pgmap) * (size/CHUNK_SIZE), |
| 1000 | GFP_KERNEL)) == NULL) { |
| 1001 | ret = -ENOMEM; |
| 1002 | break; |
| 1003 | } |
| 1004 | |
| 1005 | ret = mon_alloc_buff(vec, size/CHUNK_SIZE); |
| 1006 | if (ret < 0) { |
| 1007 | kfree(vec); |
| 1008 | break; |
| 1009 | } |
| 1010 | |
| 1011 | mutex_lock(&rp->fetch_lock); |
| 1012 | spin_lock_irqsave(&rp->b_lock, flags); |
| 1013 | mon_free_buff(rp->b_vec, size/CHUNK_SIZE); |
| 1014 | kfree(rp->b_vec); |
| 1015 | rp->b_vec = vec; |
| 1016 | rp->b_size = size; |
| 1017 | rp->b_read = rp->b_in = rp->b_out = rp->b_cnt = 0; |
| 1018 | rp->cnt_lost = 0; |
| 1019 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 1020 | mutex_unlock(&rp->fetch_lock); |
| 1021 | } |
| 1022 | break; |
| 1023 | |
| 1024 | case MON_IOCH_MFLUSH: |
| 1025 | ret = mon_bin_flush(rp, arg); |
| 1026 | break; |
| 1027 | |
| 1028 | case MON_IOCX_GET: |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 1029 | case MON_IOCX_GETX: |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1030 | { |
| 1031 | struct mon_bin_get getb; |
| 1032 | |
| 1033 | if (copy_from_user(&getb, (void __user *)arg, |
| 1034 | sizeof(struct mon_bin_get))) |
| 1035 | return -EFAULT; |
| 1036 | |
| 1037 | if (getb.alloc > 0x10000000) /* Want to cast to u32 */ |
| 1038 | return -EINVAL; |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 1039 | ret = mon_bin_get_event(file, rp, getb.hdr, |
| 1040 | (cmd == MON_IOCX_GET)? PKT_SZ_API0: PKT_SZ_API1, |
| 1041 | getb.data, (unsigned int)getb.alloc); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1042 | } |
| 1043 | break; |
| 1044 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1045 | case MON_IOCX_MFETCH: |
| 1046 | { |
| 1047 | struct mon_bin_mfetch mfetch; |
| 1048 | struct mon_bin_mfetch __user *uptr; |
| 1049 | |
| 1050 | uptr = (struct mon_bin_mfetch __user *)arg; |
| 1051 | |
| 1052 | if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) |
| 1053 | return -EFAULT; |
| 1054 | |
| 1055 | if (mfetch.nflush) { |
| 1056 | ret = mon_bin_flush(rp, mfetch.nflush); |
| 1057 | if (ret < 0) |
| 1058 | return ret; |
| 1059 | if (put_user(ret, &uptr->nflush)) |
| 1060 | return -EFAULT; |
| 1061 | } |
| 1062 | ret = mon_bin_fetch(file, rp, mfetch.offvec, mfetch.nfetch); |
| 1063 | if (ret < 0) |
| 1064 | return ret; |
| 1065 | if (put_user(ret, &uptr->nfetch)) |
| 1066 | return -EFAULT; |
| 1067 | ret = 0; |
| 1068 | } |
| 1069 | break; |
| 1070 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1071 | case MON_IOCG_STATS: { |
| 1072 | struct mon_bin_stats __user *sp; |
| 1073 | unsigned int nevents; |
| 1074 | unsigned int ndropped; |
| 1075 | |
| 1076 | spin_lock_irqsave(&rp->b_lock, flags); |
| 1077 | ndropped = rp->cnt_lost; |
| 1078 | rp->cnt_lost = 0; |
| 1079 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 1080 | nevents = mon_bin_queued(rp); |
| 1081 | |
| 1082 | sp = (struct mon_bin_stats __user *)arg; |
| 1083 | if (put_user(rp->cnt_lost, &sp->dropped)) |
| 1084 | return -EFAULT; |
| 1085 | if (put_user(nevents, &sp->queued)) |
| 1086 | return -EFAULT; |
| 1087 | |
| 1088 | } |
| 1089 | break; |
| 1090 | |
| 1091 | default: |
| 1092 | return -ENOTTY; |
| 1093 | } |
| 1094 | |
| 1095 | return ret; |
| 1096 | } |
| 1097 | |
Pete Zaitcev | 7abce6b | 2008-12-20 12:56:08 -0700 | [diff] [blame] | 1098 | #ifdef CONFIG_COMPAT |
| 1099 | static long mon_bin_compat_ioctl(struct file *file, |
| 1100 | unsigned int cmd, unsigned long arg) |
| 1101 | { |
| 1102 | struct mon_reader_bin *rp = file->private_data; |
| 1103 | int ret; |
| 1104 | |
| 1105 | switch (cmd) { |
| 1106 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 1107 | case MON_IOCX_GET32: |
| 1108 | case MON_IOCX_GETX32: |
| 1109 | { |
Pete Zaitcev | 7abce6b | 2008-12-20 12:56:08 -0700 | [diff] [blame] | 1110 | struct mon_bin_get32 getb; |
| 1111 | |
| 1112 | if (copy_from_user(&getb, (void __user *)arg, |
| 1113 | sizeof(struct mon_bin_get32))) |
| 1114 | return -EFAULT; |
| 1115 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 1116 | ret = mon_bin_get_event(file, rp, compat_ptr(getb.hdr32), |
| 1117 | (cmd == MON_IOCX_GET32)? PKT_SZ_API0: PKT_SZ_API1, |
| 1118 | compat_ptr(getb.data32), getb.alloc32); |
Pete Zaitcev | 7abce6b | 2008-12-20 12:56:08 -0700 | [diff] [blame] | 1119 | if (ret < 0) |
| 1120 | return ret; |
| 1121 | } |
| 1122 | return 0; |
| 1123 | |
| 1124 | case MON_IOCX_MFETCH32: |
| 1125 | { |
| 1126 | struct mon_bin_mfetch32 mfetch; |
| 1127 | struct mon_bin_mfetch32 __user *uptr; |
| 1128 | |
| 1129 | uptr = (struct mon_bin_mfetch32 __user *) compat_ptr(arg); |
| 1130 | |
| 1131 | if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) |
| 1132 | return -EFAULT; |
| 1133 | |
| 1134 | if (mfetch.nflush32) { |
| 1135 | ret = mon_bin_flush(rp, mfetch.nflush32); |
| 1136 | if (ret < 0) |
| 1137 | return ret; |
| 1138 | if (put_user(ret, &uptr->nflush32)) |
| 1139 | return -EFAULT; |
| 1140 | } |
| 1141 | ret = mon_bin_fetch(file, rp, compat_ptr(mfetch.offvec32), |
| 1142 | mfetch.nfetch32); |
| 1143 | if (ret < 0) |
| 1144 | return ret; |
| 1145 | if (put_user(ret, &uptr->nfetch32)) |
| 1146 | return -EFAULT; |
| 1147 | } |
| 1148 | return 0; |
| 1149 | |
| 1150 | case MON_IOCG_STATS: |
| 1151 | return mon_bin_ioctl(NULL, file, cmd, |
| 1152 | (unsigned long) compat_ptr(arg)); |
| 1153 | |
| 1154 | case MON_IOCQ_URB_LEN: |
| 1155 | case MON_IOCQ_RING_SIZE: |
| 1156 | case MON_IOCT_RING_SIZE: |
| 1157 | case MON_IOCH_MFLUSH: |
| 1158 | return mon_bin_ioctl(NULL, file, cmd, arg); |
| 1159 | |
| 1160 | default: |
| 1161 | ; |
| 1162 | } |
| 1163 | return -ENOTTY; |
| 1164 | } |
| 1165 | #endif /* CONFIG_COMPAT */ |
| 1166 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1167 | static unsigned int |
| 1168 | mon_bin_poll(struct file *file, struct poll_table_struct *wait) |
| 1169 | { |
| 1170 | struct mon_reader_bin *rp = file->private_data; |
| 1171 | unsigned int mask = 0; |
| 1172 | unsigned long flags; |
| 1173 | |
| 1174 | if (file->f_mode & FMODE_READ) |
| 1175 | poll_wait(file, &rp->b_wait, wait); |
| 1176 | |
| 1177 | spin_lock_irqsave(&rp->b_lock, flags); |
| 1178 | if (!MON_RING_EMPTY(rp)) |
| 1179 | mask |= POLLIN | POLLRDNORM; /* readable */ |
| 1180 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 1181 | return mask; |
| 1182 | } |
| 1183 | |
| 1184 | /* |
| 1185 | * open and close: just keep track of how many times the device is |
| 1186 | * mapped, to use the proper memory allocation function. |
| 1187 | */ |
| 1188 | static void mon_bin_vma_open(struct vm_area_struct *vma) |
| 1189 | { |
| 1190 | struct mon_reader_bin *rp = vma->vm_private_data; |
| 1191 | rp->mmap_active++; |
| 1192 | } |
| 1193 | |
| 1194 | static void mon_bin_vma_close(struct vm_area_struct *vma) |
| 1195 | { |
| 1196 | struct mon_reader_bin *rp = vma->vm_private_data; |
| 1197 | rp->mmap_active--; |
| 1198 | } |
| 1199 | |
| 1200 | /* |
| 1201 | * Map ring pages to user space. |
| 1202 | */ |
Nick Piggin | 041509d | 2007-12-13 16:15:35 -0800 | [diff] [blame] | 1203 | static int mon_bin_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1204 | { |
| 1205 | struct mon_reader_bin *rp = vma->vm_private_data; |
| 1206 | unsigned long offset, chunk_idx; |
| 1207 | struct page *pageptr; |
| 1208 | |
Nick Piggin | 041509d | 2007-12-13 16:15:35 -0800 | [diff] [blame] | 1209 | offset = vmf->pgoff << PAGE_SHIFT; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1210 | if (offset >= rp->b_size) |
Nick Piggin | 041509d | 2007-12-13 16:15:35 -0800 | [diff] [blame] | 1211 | return VM_FAULT_SIGBUS; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1212 | chunk_idx = offset / CHUNK_SIZE; |
| 1213 | pageptr = rp->b_vec[chunk_idx].pg; |
| 1214 | get_page(pageptr); |
Nick Piggin | 041509d | 2007-12-13 16:15:35 -0800 | [diff] [blame] | 1215 | vmf->page = pageptr; |
| 1216 | return 0; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1217 | } |
| 1218 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 1219 | static const struct vm_operations_struct mon_bin_vm_ops = { |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1220 | .open = mon_bin_vma_open, |
| 1221 | .close = mon_bin_vma_close, |
Nick Piggin | 041509d | 2007-12-13 16:15:35 -0800 | [diff] [blame] | 1222 | .fault = mon_bin_vma_fault, |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1223 | }; |
| 1224 | |
Pete Zaitcev | 454459b | 2008-03-19 22:29:51 -0700 | [diff] [blame] | 1225 | static int mon_bin_mmap(struct file *filp, struct vm_area_struct *vma) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1226 | { |
Nick Piggin | 041509d | 2007-12-13 16:15:35 -0800 | [diff] [blame] | 1227 | /* don't do anything here: "fault" will set up page table entries */ |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1228 | vma->vm_ops = &mon_bin_vm_ops; |
| 1229 | vma->vm_flags |= VM_RESERVED; |
| 1230 | vma->vm_private_data = filp->private_data; |
| 1231 | mon_bin_vma_open(vma); |
| 1232 | return 0; |
| 1233 | } |
| 1234 | |
Jan Engelhardt | 0b3f5fe | 2008-01-22 20:51:11 +0100 | [diff] [blame] | 1235 | static const struct file_operations mon_fops_binary = { |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1236 | .owner = THIS_MODULE, |
| 1237 | .open = mon_bin_open, |
| 1238 | .llseek = no_llseek, |
| 1239 | .read = mon_bin_read, |
| 1240 | /* .write = mon_text_write, */ |
| 1241 | .poll = mon_bin_poll, |
| 1242 | .ioctl = mon_bin_ioctl, |
Pete Zaitcev | 7abce6b | 2008-12-20 12:56:08 -0700 | [diff] [blame] | 1243 | #ifdef CONFIG_COMPAT |
| 1244 | .compat_ioctl = mon_bin_compat_ioctl, |
| 1245 | #endif |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1246 | .release = mon_bin_release, |
Pete Zaitcev | 454459b | 2008-03-19 22:29:51 -0700 | [diff] [blame] | 1247 | .mmap = mon_bin_mmap, |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1248 | }; |
| 1249 | |
| 1250 | static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp) |
| 1251 | { |
| 1252 | DECLARE_WAITQUEUE(waita, current); |
| 1253 | unsigned long flags; |
| 1254 | |
| 1255 | add_wait_queue(&rp->b_wait, &waita); |
| 1256 | set_current_state(TASK_INTERRUPTIBLE); |
| 1257 | |
| 1258 | spin_lock_irqsave(&rp->b_lock, flags); |
| 1259 | while (MON_RING_EMPTY(rp)) { |
| 1260 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 1261 | |
| 1262 | if (file->f_flags & O_NONBLOCK) { |
| 1263 | set_current_state(TASK_RUNNING); |
| 1264 | remove_wait_queue(&rp->b_wait, &waita); |
| 1265 | return -EWOULDBLOCK; /* Same as EAGAIN in Linux */ |
| 1266 | } |
| 1267 | schedule(); |
| 1268 | if (signal_pending(current)) { |
| 1269 | remove_wait_queue(&rp->b_wait, &waita); |
| 1270 | return -EINTR; |
| 1271 | } |
| 1272 | set_current_state(TASK_INTERRUPTIBLE); |
| 1273 | |
| 1274 | spin_lock_irqsave(&rp->b_lock, flags); |
| 1275 | } |
| 1276 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 1277 | |
| 1278 | set_current_state(TASK_RUNNING); |
| 1279 | remove_wait_queue(&rp->b_wait, &waita); |
| 1280 | return 0; |
| 1281 | } |
| 1282 | |
| 1283 | static int mon_alloc_buff(struct mon_pgmap *map, int npages) |
| 1284 | { |
| 1285 | int n; |
| 1286 | unsigned long vaddr; |
| 1287 | |
| 1288 | for (n = 0; n < npages; n++) { |
| 1289 | vaddr = get_zeroed_page(GFP_KERNEL); |
| 1290 | if (vaddr == 0) { |
| 1291 | while (n-- != 0) |
| 1292 | free_page((unsigned long) map[n].ptr); |
| 1293 | return -ENOMEM; |
| 1294 | } |
| 1295 | map[n].ptr = (unsigned char *) vaddr; |
Kevin Cernekee | 5bfd756 | 2009-07-05 12:08:19 -0700 | [diff] [blame] | 1296 | map[n].pg = virt_to_page((void *) vaddr); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1297 | } |
| 1298 | return 0; |
| 1299 | } |
| 1300 | |
| 1301 | static void mon_free_buff(struct mon_pgmap *map, int npages) |
| 1302 | { |
| 1303 | int n; |
| 1304 | |
| 1305 | for (n = 0; n < npages; n++) |
| 1306 | free_page((unsigned long) map[n].ptr); |
| 1307 | } |
| 1308 | |
Pete Zaitcev | ce7cd137f | 2007-05-03 16:51:16 -0700 | [diff] [blame] | 1309 | int mon_bin_add(struct mon_bus *mbus, const struct usb_bus *ubus) |
| 1310 | { |
| 1311 | struct device *dev; |
| 1312 | unsigned minor = ubus? ubus->busnum: 0; |
| 1313 | |
| 1314 | if (minor >= MON_BIN_MAX_MINOR) |
| 1315 | return 0; |
| 1316 | |
Greg Kroah-Hartman | b0b090e | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 1317 | dev = device_create(mon_bin_class, ubus ? ubus->controller : NULL, |
| 1318 | MKDEV(MAJOR(mon_bin_dev0), minor), NULL, |
| 1319 | "usbmon%d", minor); |
Pete Zaitcev | ce7cd137f | 2007-05-03 16:51:16 -0700 | [diff] [blame] | 1320 | if (IS_ERR(dev)) |
| 1321 | return 0; |
| 1322 | |
| 1323 | mbus->classdev = dev; |
| 1324 | return 1; |
| 1325 | } |
| 1326 | |
| 1327 | void mon_bin_del(struct mon_bus *mbus) |
| 1328 | { |
| 1329 | device_destroy(mon_bin_class, mbus->classdev->devt); |
| 1330 | } |
| 1331 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1332 | int __init mon_bin_init(void) |
| 1333 | { |
| 1334 | int rc; |
| 1335 | |
Pete Zaitcev | ce7cd137f | 2007-05-03 16:51:16 -0700 | [diff] [blame] | 1336 | mon_bin_class = class_create(THIS_MODULE, "usbmon"); |
| 1337 | if (IS_ERR(mon_bin_class)) { |
| 1338 | rc = PTR_ERR(mon_bin_class); |
| 1339 | goto err_class; |
| 1340 | } |
| 1341 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1342 | rc = alloc_chrdev_region(&mon_bin_dev0, 0, MON_BIN_MAX_MINOR, "usbmon"); |
| 1343 | if (rc < 0) |
| 1344 | goto err_dev; |
| 1345 | |
| 1346 | cdev_init(&mon_bin_cdev, &mon_fops_binary); |
| 1347 | mon_bin_cdev.owner = THIS_MODULE; |
| 1348 | |
| 1349 | rc = cdev_add(&mon_bin_cdev, mon_bin_dev0, MON_BIN_MAX_MINOR); |
| 1350 | if (rc < 0) |
| 1351 | goto err_add; |
| 1352 | |
| 1353 | return 0; |
| 1354 | |
| 1355 | err_add: |
| 1356 | unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); |
| 1357 | err_dev: |
Pete Zaitcev | ce7cd137f | 2007-05-03 16:51:16 -0700 | [diff] [blame] | 1358 | class_destroy(mon_bin_class); |
| 1359 | err_class: |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1360 | return rc; |
| 1361 | } |
| 1362 | |
Pete Zaitcev | 21641e3 | 2007-02-20 10:37:52 -0800 | [diff] [blame] | 1363 | void mon_bin_exit(void) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1364 | { |
| 1365 | cdev_del(&mon_bin_cdev); |
| 1366 | unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); |
Pete Zaitcev | ce7cd137f | 2007-05-03 16:51:16 -0700 | [diff] [blame] | 1367 | class_destroy(mon_bin_class); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1368 | } |