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> |
Paul Gortmaker | f940fcd | 2011-05-27 09:56:31 -0400 | [diff] [blame] | 14 | #include <linux/export.h> |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 15 | #include <linux/usb.h> |
| 16 | #include <linux/poll.h> |
| 17 | #include <linux/compat.h> |
| 18 | #include <linux/mm.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> |
Tina Ruchandani | 8ab0f72 | 2015-10-29 22:44:31 -0700 | [diff] [blame] | 21 | #include <linux/time64.h> |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 22 | |
| 23 | #include <asm/uaccess.h> |
| 24 | |
| 25 | #include "usb_mon.h" |
| 26 | |
| 27 | /* |
| 28 | * Defined by USB 2.0 clause 9.3, table 9.2. |
| 29 | */ |
| 30 | #define SETUP_LEN 8 |
| 31 | |
| 32 | /* ioctl macros */ |
| 33 | #define MON_IOC_MAGIC 0x92 |
| 34 | |
| 35 | #define MON_IOCQ_URB_LEN _IO(MON_IOC_MAGIC, 1) |
| 36 | /* #2 used to be MON_IOCX_URB, removed before it got into Linus tree */ |
| 37 | #define MON_IOCG_STATS _IOR(MON_IOC_MAGIC, 3, struct mon_bin_stats) |
| 38 | #define MON_IOCT_RING_SIZE _IO(MON_IOC_MAGIC, 4) |
| 39 | #define MON_IOCQ_RING_SIZE _IO(MON_IOC_MAGIC, 5) |
| 40 | #define MON_IOCX_GET _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get) |
| 41 | #define MON_IOCX_MFETCH _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch) |
| 42 | #define MON_IOCH_MFLUSH _IO(MON_IOC_MAGIC, 8) |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 43 | /* #9 was MON_IOCT_SETAPI */ |
| 44 | #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] | 45 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 46 | #ifdef CONFIG_COMPAT |
| 47 | #define MON_IOCX_GET32 _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get32) |
| 48 | #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] | 49 | #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] | 50 | #endif |
| 51 | |
| 52 | /* |
| 53 | * Some architectures have enormous basic pages (16KB for ia64, 64KB for ppc). |
| 54 | * But it's all right. Just use a simple way to make sure the chunk is never |
| 55 | * smaller than a page. |
| 56 | * |
| 57 | * N.B. An application does not know our chunk size. |
| 58 | * |
| 59 | * Woops, get_zeroed_page() returns a single page. I guess we're stuck with |
| 60 | * page-sized chunks for the time being. |
| 61 | */ |
| 62 | #define CHUNK_SIZE PAGE_SIZE |
| 63 | #define CHUNK_ALIGN(x) (((x)+CHUNK_SIZE-1) & ~(CHUNK_SIZE-1)) |
| 64 | |
| 65 | /* |
| 66 | * The magic limit was calculated so that it allows the monitoring |
| 67 | * application to pick data once in two ticks. This way, another application, |
| 68 | * which presumably drives the bus, gets to hog CPU, yet we collect our data. |
| 69 | * If HZ is 100, a 480 mbit/s bus drives 614 KB every jiffy. USB has an |
| 70 | * enormous overhead built into the bus protocol, so we need about 1000 KB. |
| 71 | * |
| 72 | * This is still too much for most cases, where we just snoop a few |
| 73 | * descriptor fetches for enumeration. So, the default is a "reasonable" |
| 74 | * amount for systems with HZ=250 and incomplete bus saturation. |
| 75 | * |
| 76 | * XXX What about multi-megabyte URBs which take minutes to transfer? |
| 77 | */ |
| 78 | #define BUFF_MAX CHUNK_ALIGN(1200*1024) |
| 79 | #define BUFF_DFL CHUNK_ALIGN(300*1024) |
| 80 | #define BUFF_MIN CHUNK_ALIGN(8*1024) |
| 81 | |
| 82 | /* |
| 83 | * The per-event API header (2 per URB). |
| 84 | * |
| 85 | * This structure is seen in userland as defined by the documentation. |
| 86 | */ |
| 87 | struct mon_bin_hdr { |
| 88 | u64 id; /* URB ID - from submission to callback */ |
| 89 | unsigned char type; /* Same as in text API; extensible. */ |
| 90 | unsigned char xfer_type; /* ISO, Intr, Control, Bulk */ |
| 91 | unsigned char epnum; /* Endpoint number and transfer direction */ |
| 92 | unsigned char devnum; /* Device address */ |
| 93 | unsigned short busnum; /* Bus number */ |
| 94 | char flag_setup; |
| 95 | char flag_data; |
Tina Ruchandani | 8ab0f72 | 2015-10-29 22:44:31 -0700 | [diff] [blame] | 96 | s64 ts_sec; /* getnstimeofday64 */ |
| 97 | s32 ts_usec; /* getnstimeofday64 */ |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 98 | int status; |
| 99 | unsigned int len_urb; /* Length of data (submitted or actual) */ |
| 100 | unsigned int len_cap; /* Delivered length */ |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 101 | union { |
| 102 | unsigned char setup[SETUP_LEN]; /* Only for Control S-type */ |
| 103 | struct iso_rec { |
| 104 | int error_count; |
| 105 | int numdesc; |
| 106 | } iso; |
| 107 | } s; |
| 108 | int interval; |
| 109 | int start_frame; |
| 110 | unsigned int xfer_flags; |
| 111 | unsigned int ndesc; /* Actual number of ISO descriptors */ |
| 112 | }; |
| 113 | |
| 114 | /* |
| 115 | * ISO vector, packed into the head of data stream. |
| 116 | * This has to take 16 bytes to make sure that the end of buffer |
| 117 | * wrap is not happening in the middle of a descriptor. |
| 118 | */ |
| 119 | struct mon_bin_isodesc { |
| 120 | int iso_status; |
| 121 | unsigned int iso_off; |
| 122 | unsigned int iso_len; |
| 123 | u32 _pad; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 124 | }; |
| 125 | |
| 126 | /* per file statistic */ |
| 127 | struct mon_bin_stats { |
| 128 | u32 queued; |
| 129 | u32 dropped; |
| 130 | }; |
| 131 | |
| 132 | struct mon_bin_get { |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 133 | struct mon_bin_hdr __user *hdr; /* Can be 48 bytes or 64. */ |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 134 | void __user *data; |
| 135 | size_t alloc; /* Length of data (can be zero) */ |
| 136 | }; |
| 137 | |
| 138 | struct mon_bin_mfetch { |
| 139 | u32 __user *offvec; /* Vector of events fetched */ |
| 140 | u32 nfetch; /* Number of events to fetch (out: fetched) */ |
| 141 | u32 nflush; /* Number of events to flush */ |
| 142 | }; |
| 143 | |
| 144 | #ifdef CONFIG_COMPAT |
| 145 | struct mon_bin_get32 { |
| 146 | u32 hdr32; |
| 147 | u32 data32; |
| 148 | u32 alloc32; |
| 149 | }; |
| 150 | |
| 151 | struct mon_bin_mfetch32 { |
| 152 | u32 offvec32; |
| 153 | u32 nfetch32; |
| 154 | u32 nflush32; |
| 155 | }; |
| 156 | #endif |
| 157 | |
| 158 | /* Having these two values same prevents wrapping of the mon_bin_hdr */ |
| 159 | #define PKT_ALIGN 64 |
| 160 | #define PKT_SIZE 64 |
| 161 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 162 | #define PKT_SZ_API0 48 /* API 0 (2.6.20) size */ |
| 163 | #define PKT_SZ_API1 64 /* API 1 size: extra fields */ |
| 164 | |
| 165 | #define ISODESC_MAX 128 /* Same number as usbfs allows, 2048 bytes. */ |
| 166 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 167 | /* max number of USB bus supported */ |
| 168 | #define MON_BIN_MAX_MINOR 128 |
| 169 | |
| 170 | /* |
| 171 | * The buffer: map of used pages. |
| 172 | */ |
| 173 | struct mon_pgmap { |
| 174 | struct page *pg; |
| 175 | unsigned char *ptr; /* XXX just use page_to_virt everywhere? */ |
| 176 | }; |
| 177 | |
| 178 | /* |
| 179 | * This gets associated with an open file struct. |
| 180 | */ |
| 181 | struct mon_reader_bin { |
| 182 | /* The buffer: one per open. */ |
| 183 | spinlock_t b_lock; /* Protect b_cnt, b_in */ |
| 184 | unsigned int b_size; /* Current size of the buffer - bytes */ |
| 185 | unsigned int b_cnt; /* Bytes used */ |
| 186 | unsigned int b_in, b_out; /* Offsets into buffer - bytes */ |
| 187 | unsigned int b_read; /* Amount of read data in curr. pkt. */ |
| 188 | struct mon_pgmap *b_vec; /* The map array */ |
| 189 | wait_queue_head_t b_wait; /* Wait for data here */ |
| 190 | |
| 191 | struct mutex fetch_lock; /* Protect b_read, b_out */ |
| 192 | int mmap_active; |
| 193 | |
| 194 | /* A list of these is needed for "bus 0". Some time later. */ |
| 195 | struct mon_reader r; |
| 196 | |
| 197 | /* Stats */ |
| 198 | unsigned int cnt_lost; |
| 199 | }; |
| 200 | |
| 201 | static inline struct mon_bin_hdr *MON_OFF2HDR(const struct mon_reader_bin *rp, |
| 202 | unsigned int offset) |
| 203 | { |
| 204 | return (struct mon_bin_hdr *) |
| 205 | (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE); |
| 206 | } |
| 207 | |
| 208 | #define MON_RING_EMPTY(rp) ((rp)->b_cnt == 0) |
| 209 | |
Pete Zaitcev | 30c7431 | 2007-08-14 00:33:40 -0700 | [diff] [blame] | 210 | static unsigned char xfer_to_pipe[4] = { |
| 211 | PIPE_CONTROL, PIPE_ISOCHRONOUS, PIPE_BULK, PIPE_INTERRUPT |
| 212 | }; |
| 213 | |
Pete Zaitcev | ce7cd137f | 2007-05-03 16:51:16 -0700 | [diff] [blame] | 214 | static struct class *mon_bin_class; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 215 | static dev_t mon_bin_dev0; |
| 216 | static struct cdev mon_bin_cdev; |
| 217 | |
| 218 | static void mon_buff_area_fill(const struct mon_reader_bin *rp, |
| 219 | unsigned int offset, unsigned int size); |
| 220 | static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp); |
| 221 | static int mon_alloc_buff(struct mon_pgmap *map, int npages); |
| 222 | static void mon_free_buff(struct mon_pgmap *map, int npages); |
| 223 | |
| 224 | /* |
| 225 | * This is a "chunked memcpy". It does not manipulate any counters. |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 226 | */ |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 227 | 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] | 228 | unsigned int off, const unsigned char *from, unsigned int length) |
| 229 | { |
| 230 | unsigned int step_len; |
| 231 | unsigned char *buf; |
| 232 | unsigned int in_page; |
| 233 | |
| 234 | while (length) { |
| 235 | /* |
| 236 | * Determine step_len. |
| 237 | */ |
| 238 | step_len = length; |
| 239 | in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1)); |
| 240 | if (in_page < step_len) |
| 241 | step_len = in_page; |
| 242 | |
| 243 | /* |
| 244 | * Copy data and advance pointers. |
| 245 | */ |
| 246 | buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE; |
| 247 | memcpy(buf, from, step_len); |
| 248 | if ((off += step_len) >= this->b_size) off = 0; |
| 249 | from += step_len; |
| 250 | length -= step_len; |
| 251 | } |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 252 | return off; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | /* |
| 256 | * This is a little worse than the above because it's "chunked copy_to_user". |
| 257 | * The return value is an error code, not an offset. |
| 258 | */ |
| 259 | static int copy_from_buf(const struct mon_reader_bin *this, unsigned int off, |
| 260 | char __user *to, int length) |
| 261 | { |
| 262 | unsigned int step_len; |
| 263 | unsigned char *buf; |
| 264 | unsigned int in_page; |
| 265 | |
| 266 | while (length) { |
| 267 | /* |
| 268 | * Determine step_len. |
| 269 | */ |
| 270 | step_len = length; |
| 271 | in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1)); |
| 272 | if (in_page < step_len) |
| 273 | step_len = in_page; |
| 274 | |
| 275 | /* |
| 276 | * Copy data and advance pointers. |
| 277 | */ |
| 278 | buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE; |
| 279 | if (copy_to_user(to, buf, step_len)) |
| 280 | return -EINVAL; |
| 281 | if ((off += step_len) >= this->b_size) off = 0; |
| 282 | to += step_len; |
| 283 | length -= step_len; |
| 284 | } |
| 285 | return 0; |
| 286 | } |
| 287 | |
| 288 | /* |
| 289 | * Allocate an (aligned) area in the buffer. |
| 290 | * This is called under b_lock. |
| 291 | * Returns ~0 on failure. |
| 292 | */ |
| 293 | static unsigned int mon_buff_area_alloc(struct mon_reader_bin *rp, |
| 294 | unsigned int size) |
| 295 | { |
| 296 | unsigned int offset; |
| 297 | |
| 298 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
| 299 | if (rp->b_cnt + size > rp->b_size) |
| 300 | return ~0; |
| 301 | offset = rp->b_in; |
| 302 | rp->b_cnt += size; |
| 303 | if ((rp->b_in += size) >= rp->b_size) |
| 304 | rp->b_in -= rp->b_size; |
| 305 | return offset; |
| 306 | } |
| 307 | |
| 308 | /* |
| 309 | * This is the same thing as mon_buff_area_alloc, only it does not allow |
| 310 | * buffers to wrap. This is needed by applications which pass references |
| 311 | * into mmap-ed buffers up their stacks (libpcap can do that). |
| 312 | * |
| 313 | * Currently, we always have the header stuck with the data, although |
| 314 | * it is not strictly speaking necessary. |
| 315 | * |
| 316 | * When a buffer would wrap, we place a filler packet to mark the space. |
| 317 | */ |
| 318 | static unsigned int mon_buff_area_alloc_contiguous(struct mon_reader_bin *rp, |
| 319 | unsigned int size) |
| 320 | { |
| 321 | unsigned int offset; |
| 322 | unsigned int fill_size; |
| 323 | |
| 324 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
| 325 | if (rp->b_cnt + size > rp->b_size) |
| 326 | return ~0; |
| 327 | if (rp->b_in + size > rp->b_size) { |
| 328 | /* |
| 329 | * This would wrap. Find if we still have space after |
| 330 | * skipping to the end of the buffer. If we do, place |
| 331 | * a filler packet and allocate a new packet. |
| 332 | */ |
| 333 | fill_size = rp->b_size - rp->b_in; |
| 334 | if (rp->b_cnt + size + fill_size > rp->b_size) |
| 335 | return ~0; |
| 336 | mon_buff_area_fill(rp, rp->b_in, fill_size); |
| 337 | |
| 338 | offset = 0; |
| 339 | rp->b_in = size; |
| 340 | rp->b_cnt += size + fill_size; |
| 341 | } else if (rp->b_in + size == rp->b_size) { |
| 342 | offset = rp->b_in; |
| 343 | rp->b_in = 0; |
| 344 | rp->b_cnt += size; |
| 345 | } else { |
| 346 | offset = rp->b_in; |
| 347 | rp->b_in += size; |
| 348 | rp->b_cnt += size; |
| 349 | } |
| 350 | return offset; |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * Return a few (kilo-)bytes to the head of the buffer. |
Alan Stern | fca9474 | 2009-11-04 11:35:53 -0500 | [diff] [blame] | 355 | * This is used if a data fetch fails. |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 356 | */ |
| 357 | static void mon_buff_area_shrink(struct mon_reader_bin *rp, unsigned int size) |
| 358 | { |
| 359 | |
Alan Stern | fca9474 | 2009-11-04 11:35:53 -0500 | [diff] [blame] | 360 | /* size &= ~(PKT_ALIGN-1); -- we're called with aligned size */ |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 361 | rp->b_cnt -= size; |
| 362 | if (rp->b_in < size) |
| 363 | rp->b_in += rp->b_size; |
| 364 | rp->b_in -= size; |
| 365 | } |
| 366 | |
| 367 | /* |
| 368 | * This has to be called under both b_lock and fetch_lock, because |
| 369 | * it accesses both b_cnt and b_out. |
| 370 | */ |
| 371 | static void mon_buff_area_free(struct mon_reader_bin *rp, unsigned int size) |
| 372 | { |
| 373 | |
| 374 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
| 375 | rp->b_cnt -= size; |
| 376 | if ((rp->b_out += size) >= rp->b_size) |
| 377 | rp->b_out -= rp->b_size; |
| 378 | } |
| 379 | |
| 380 | static void mon_buff_area_fill(const struct mon_reader_bin *rp, |
| 381 | unsigned int offset, unsigned int size) |
| 382 | { |
| 383 | struct mon_bin_hdr *ep; |
| 384 | |
| 385 | ep = MON_OFF2HDR(rp, offset); |
| 386 | memset(ep, 0, PKT_SIZE); |
| 387 | ep->type = '@'; |
| 388 | ep->len_cap = size - PKT_SIZE; |
| 389 | } |
| 390 | |
| 391 | static inline char mon_bin_get_setup(unsigned char *setupb, |
| 392 | const struct urb *urb, char ev_type) |
| 393 | { |
| 394 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 395 | if (urb->setup_packet == NULL) |
| 396 | return 'Z'; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 397 | memcpy(setupb, urb->setup_packet, SETUP_LEN); |
| 398 | return 0; |
| 399 | } |
| 400 | |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 401 | static unsigned int mon_bin_get_data(const struct mon_reader_bin *rp, |
| 402 | unsigned int offset, struct urb *urb, unsigned int length, |
| 403 | char *flag) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 404 | { |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 405 | int i; |
| 406 | struct scatterlist *sg; |
| 407 | unsigned int this_len; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 408 | |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 409 | *flag = 0; |
| 410 | if (urb->num_sgs == 0) { |
| 411 | if (urb->transfer_buffer == NULL) { |
| 412 | *flag = 'Z'; |
| 413 | return length; |
| 414 | } |
| 415 | mon_copy_to_buff(rp, offset, urb->transfer_buffer, length); |
| 416 | length = 0; |
| 417 | |
| 418 | } else { |
| 419 | /* If IOMMU coalescing occurred, we cannot trust sg_page */ |
Alan Stern | ff9c895 | 2010-04-02 13:27:28 -0400 | [diff] [blame] | 420 | if (urb->transfer_flags & URB_DMA_SG_COMBINED) { |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 421 | *flag = 'D'; |
| 422 | return length; |
| 423 | } |
| 424 | |
| 425 | /* Copy up to the first non-addressable segment */ |
Matthew Wilcox | 910f8d0 | 2010-05-01 12:20:01 -0600 | [diff] [blame] | 426 | for_each_sg(urb->sg, sg, urb->num_sgs, i) { |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 427 | if (length == 0 || PageHighMem(sg_page(sg))) |
| 428 | break; |
| 429 | this_len = min_t(unsigned int, sg->length, length); |
| 430 | offset = mon_copy_to_buff(rp, offset, sg_virt(sg), |
| 431 | this_len); |
| 432 | length -= this_len; |
| 433 | } |
| 434 | if (i == 0) |
| 435 | *flag = 'D'; |
| 436 | } |
| 437 | |
| 438 | return length; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 439 | } |
| 440 | |
Pete Zaitcev | b17ea16 | 2010-11-16 21:51:19 -0700 | [diff] [blame] | 441 | /* |
| 442 | * This is the look-ahead pass in case of 'C Zi', when actual_length cannot |
| 443 | * be used to determine the length of the whole contiguous buffer. |
| 444 | */ |
| 445 | static unsigned int mon_bin_collate_isodesc(const struct mon_reader_bin *rp, |
| 446 | struct urb *urb, unsigned int ndesc) |
| 447 | { |
| 448 | struct usb_iso_packet_descriptor *fp; |
| 449 | unsigned int length; |
| 450 | |
| 451 | length = 0; |
| 452 | fp = urb->iso_frame_desc; |
| 453 | while (ndesc-- != 0) { |
| 454 | if (fp->actual_length != 0) { |
| 455 | if (fp->offset + fp->actual_length > length) |
| 456 | length = fp->offset + fp->actual_length; |
| 457 | } |
| 458 | fp++; |
| 459 | } |
| 460 | return length; |
| 461 | } |
| 462 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 463 | static void mon_bin_get_isodesc(const struct mon_reader_bin *rp, |
| 464 | unsigned int offset, struct urb *urb, char ev_type, unsigned int ndesc) |
| 465 | { |
| 466 | struct mon_bin_isodesc *dp; |
| 467 | struct usb_iso_packet_descriptor *fp; |
| 468 | |
| 469 | fp = urb->iso_frame_desc; |
| 470 | while (ndesc-- != 0) { |
| 471 | dp = (struct mon_bin_isodesc *) |
| 472 | (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE); |
| 473 | dp->iso_status = fp->status; |
| 474 | dp->iso_off = fp->offset; |
| 475 | dp->iso_len = (ev_type == 'S') ? fp->length : fp->actual_length; |
| 476 | dp->_pad = 0; |
| 477 | if ((offset += sizeof(struct mon_bin_isodesc)) >= rp->b_size) |
| 478 | offset = 0; |
| 479 | fp++; |
| 480 | } |
| 481 | } |
| 482 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 483 | 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] | 484 | char ev_type, int status) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 485 | { |
Pete Zaitcev | 30c7431 | 2007-08-14 00:33:40 -0700 | [diff] [blame] | 486 | const struct usb_endpoint_descriptor *epd = &urb->ep->desc; |
Tina Ruchandani | 8ab0f72 | 2015-10-29 22:44:31 -0700 | [diff] [blame] | 487 | struct timespec64 ts; |
Pete Zaitcev | 2bc0d109 | 2010-01-05 11:50:07 -0700 | [diff] [blame] | 488 | unsigned long flags; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 489 | unsigned int urb_length; |
| 490 | unsigned int offset; |
| 491 | unsigned int length; |
Alan Stern | fca9474 | 2009-11-04 11:35:53 -0500 | [diff] [blame] | 492 | unsigned int delta; |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 493 | unsigned int ndesc, lendesc; |
Pete Zaitcev | 30c7431 | 2007-08-14 00:33:40 -0700 | [diff] [blame] | 494 | unsigned char dir; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 495 | struct mon_bin_hdr *ep; |
| 496 | char data_tag = 0; |
| 497 | |
Tina Ruchandani | 8ab0f72 | 2015-10-29 22:44:31 -0700 | [diff] [blame] | 498 | getnstimeofday64(&ts); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 499 | |
| 500 | spin_lock_irqsave(&rp->b_lock, flags); |
| 501 | |
| 502 | /* |
| 503 | * Find the maximum allowable length, then allocate space. |
| 504 | */ |
Pete Zaitcev | b17ea16 | 2010-11-16 21:51:19 -0700 | [diff] [blame] | 505 | urb_length = (ev_type == 'S') ? |
| 506 | urb->transfer_buffer_length : urb->actual_length; |
| 507 | length = urb_length; |
| 508 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 509 | if (usb_endpoint_xfer_isoc(epd)) { |
| 510 | if (urb->number_of_packets < 0) { |
| 511 | ndesc = 0; |
| 512 | } else if (urb->number_of_packets >= ISODESC_MAX) { |
| 513 | ndesc = ISODESC_MAX; |
| 514 | } else { |
| 515 | ndesc = urb->number_of_packets; |
| 516 | } |
Pete Zaitcev | b17ea16 | 2010-11-16 21:51:19 -0700 | [diff] [blame] | 517 | if (ev_type == 'C' && usb_urb_dir_in(urb)) |
| 518 | length = mon_bin_collate_isodesc(rp, urb, ndesc); |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 519 | } else { |
| 520 | ndesc = 0; |
| 521 | } |
| 522 | lendesc = ndesc*sizeof(struct mon_bin_isodesc); |
| 523 | |
Pete Zaitcev | b17ea16 | 2010-11-16 21:51:19 -0700 | [diff] [blame] | 524 | /* not an issue unless there's a subtle bug in a HCD somewhere */ |
| 525 | if (length >= urb->transfer_buffer_length) |
| 526 | length = urb->transfer_buffer_length; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 527 | |
| 528 | if (length >= rp->b_size/5) |
| 529 | length = rp->b_size/5; |
| 530 | |
Alan Stern | 18ea5d0 | 2007-07-30 17:10:36 -0400 | [diff] [blame] | 531 | if (usb_urb_dir_in(urb)) { |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 532 | if (ev_type == 'S') { |
| 533 | length = 0; |
| 534 | data_tag = '<'; |
| 535 | } |
Pete Zaitcev | 30c7431 | 2007-08-14 00:33:40 -0700 | [diff] [blame] | 536 | /* Cannot rely on endpoint number in case of control ep.0 */ |
| 537 | dir = USB_DIR_IN; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 538 | } else { |
| 539 | if (ev_type == 'C') { |
| 540 | length = 0; |
| 541 | data_tag = '>'; |
| 542 | } |
Pete Zaitcev | 30c7431 | 2007-08-14 00:33:40 -0700 | [diff] [blame] | 543 | dir = 0; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 544 | } |
| 545 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 546 | if (rp->mmap_active) { |
| 547 | offset = mon_buff_area_alloc_contiguous(rp, |
| 548 | length + PKT_SIZE + lendesc); |
| 549 | } else { |
| 550 | offset = mon_buff_area_alloc(rp, length + PKT_SIZE + lendesc); |
| 551 | } |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 552 | if (offset == ~0) { |
| 553 | rp->cnt_lost++; |
| 554 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 555 | return; |
| 556 | } |
| 557 | |
| 558 | ep = MON_OFF2HDR(rp, offset); |
| 559 | if ((offset += PKT_SIZE) >= rp->b_size) offset = 0; |
| 560 | |
| 561 | /* |
| 562 | * Fill the allocated area. |
| 563 | */ |
| 564 | memset(ep, 0, PKT_SIZE); |
| 565 | ep->type = ev_type; |
Pete Zaitcev | 30c7431 | 2007-08-14 00:33:40 -0700 | [diff] [blame] | 566 | ep->xfer_type = xfer_to_pipe[usb_endpoint_type(epd)]; |
| 567 | ep->epnum = dir | usb_endpoint_num(epd); |
Alan Stern | 18ea5d0 | 2007-07-30 17:10:36 -0400 | [diff] [blame] | 568 | ep->devnum = urb->dev->devnum; |
Pete Zaitcev | ecb658d | 2007-04-11 13:47:26 -0700 | [diff] [blame] | 569 | ep->busnum = urb->dev->bus->busnum; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 570 | ep->id = (unsigned long) urb; |
| 571 | ep->ts_sec = ts.tv_sec; |
Tina Ruchandani | 8ab0f72 | 2015-10-29 22:44:31 -0700 | [diff] [blame] | 572 | ep->ts_usec = ts.tv_nsec / NSEC_PER_USEC; |
Alan Stern | 9347d51 | 2007-08-24 15:41:41 -0400 | [diff] [blame] | 573 | ep->status = status; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 574 | ep->len_urb = urb_length; |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 575 | ep->len_cap = length + lendesc; |
| 576 | ep->xfer_flags = urb->transfer_flags; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 577 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 578 | if (usb_endpoint_xfer_int(epd)) { |
| 579 | ep->interval = urb->interval; |
| 580 | } else if (usb_endpoint_xfer_isoc(epd)) { |
| 581 | ep->interval = urb->interval; |
| 582 | ep->start_frame = urb->start_frame; |
| 583 | ep->s.iso.error_count = urb->error_count; |
| 584 | ep->s.iso.numdesc = urb->number_of_packets; |
| 585 | } |
| 586 | |
| 587 | if (usb_endpoint_xfer_control(epd) && ev_type == 'S') { |
| 588 | ep->flag_setup = mon_bin_get_setup(ep->s.setup, urb, ev_type); |
| 589 | } else { |
| 590 | ep->flag_setup = '-'; |
| 591 | } |
| 592 | |
| 593 | if (ndesc != 0) { |
| 594 | ep->ndesc = ndesc; |
| 595 | mon_bin_get_isodesc(rp, offset, urb, ev_type, ndesc); |
| 596 | if ((offset += lendesc) >= rp->b_size) |
| 597 | offset -= rp->b_size; |
| 598 | } |
| 599 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 600 | if (length != 0) { |
Alan Stern | b375e11 | 2009-11-06 12:32:23 -0500 | [diff] [blame] | 601 | length = mon_bin_get_data(rp, offset, urb, length, |
| 602 | &ep->flag_data); |
| 603 | if (length > 0) { |
Alan Stern | fca9474 | 2009-11-04 11:35:53 -0500 | [diff] [blame] | 604 | delta = (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
| 605 | ep->len_cap -= length; |
| 606 | delta -= (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
| 607 | mon_buff_area_shrink(rp, delta); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 608 | } |
| 609 | } else { |
| 610 | ep->flag_data = data_tag; |
| 611 | } |
| 612 | |
| 613 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 614 | |
| 615 | wake_up(&rp->b_wait); |
| 616 | } |
| 617 | |
| 618 | static void mon_bin_submit(void *data, struct urb *urb) |
| 619 | { |
| 620 | struct mon_reader_bin *rp = data; |
Alan Stern | 9347d51 | 2007-08-24 15:41:41 -0400 | [diff] [blame] | 621 | mon_bin_event(rp, urb, 'S', -EINPROGRESS); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 622 | } |
| 623 | |
Alan Stern | 9347d51 | 2007-08-24 15:41:41 -0400 | [diff] [blame] | 624 | static void mon_bin_complete(void *data, struct urb *urb, int status) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 625 | { |
| 626 | struct mon_reader_bin *rp = data; |
Alan Stern | 9347d51 | 2007-08-24 15:41:41 -0400 | [diff] [blame] | 627 | mon_bin_event(rp, urb, 'C', status); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 628 | } |
| 629 | |
| 630 | static void mon_bin_error(void *data, struct urb *urb, int error) |
| 631 | { |
| 632 | struct mon_reader_bin *rp = data; |
Tina Ruchandani | 8ab0f72 | 2015-10-29 22:44:31 -0700 | [diff] [blame] | 633 | struct timespec64 ts; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 634 | unsigned long flags; |
| 635 | unsigned int offset; |
| 636 | struct mon_bin_hdr *ep; |
| 637 | |
Tina Ruchandani | 8ab0f72 | 2015-10-29 22:44:31 -0700 | [diff] [blame] | 638 | getnstimeofday64(&ts); |
Pete Zaitcev | 2bc0d109 | 2010-01-05 11:50:07 -0700 | [diff] [blame] | 639 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 640 | spin_lock_irqsave(&rp->b_lock, flags); |
| 641 | |
| 642 | offset = mon_buff_area_alloc(rp, PKT_SIZE); |
| 643 | if (offset == ~0) { |
| 644 | /* Not incrementing cnt_lost. Just because. */ |
| 645 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 646 | return; |
| 647 | } |
| 648 | |
| 649 | ep = MON_OFF2HDR(rp, offset); |
| 650 | |
| 651 | memset(ep, 0, PKT_SIZE); |
| 652 | ep->type = 'E'; |
Pete Zaitcev | 30c7431 | 2007-08-14 00:33:40 -0700 | [diff] [blame] | 653 | ep->xfer_type = xfer_to_pipe[usb_endpoint_type(&urb->ep->desc)]; |
| 654 | ep->epnum = usb_urb_dir_in(urb) ? USB_DIR_IN : 0; |
| 655 | ep->epnum |= usb_endpoint_num(&urb->ep->desc); |
Alan Stern | 18ea5d0 | 2007-07-30 17:10:36 -0400 | [diff] [blame] | 656 | ep->devnum = urb->dev->devnum; |
Pete Zaitcev | ecb658d | 2007-04-11 13:47:26 -0700 | [diff] [blame] | 657 | ep->busnum = urb->dev->bus->busnum; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 658 | ep->id = (unsigned long) urb; |
Pete Zaitcev | 2bc0d109 | 2010-01-05 11:50:07 -0700 | [diff] [blame] | 659 | ep->ts_sec = ts.tv_sec; |
Tina Ruchandani | 8ab0f72 | 2015-10-29 22:44:31 -0700 | [diff] [blame] | 660 | ep->ts_usec = ts.tv_nsec / NSEC_PER_USEC; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 661 | ep->status = error; |
| 662 | |
| 663 | ep->flag_setup = '-'; |
| 664 | ep->flag_data = 'E'; |
| 665 | |
| 666 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 667 | |
| 668 | wake_up(&rp->b_wait); |
| 669 | } |
| 670 | |
| 671 | static int mon_bin_open(struct inode *inode, struct file *file) |
| 672 | { |
| 673 | struct mon_bus *mbus; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 674 | struct mon_reader_bin *rp; |
| 675 | size_t size; |
| 676 | int rc; |
| 677 | |
| 678 | mutex_lock(&mon_lock); |
Greg Kroah-Hartman | 0296951 | 2015-04-30 11:32:56 +0200 | [diff] [blame] | 679 | mbus = mon_bus_lookup(iminor(inode)); |
| 680 | if (mbus == NULL) { |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 681 | mutex_unlock(&mon_lock); |
| 682 | return -ENODEV; |
| 683 | } |
Pete Zaitcev | ecb658d | 2007-04-11 13:47:26 -0700 | [diff] [blame] | 684 | if (mbus != &mon_bus0 && mbus->u_bus == NULL) { |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 685 | printk(KERN_ERR TAG ": consistency error on open\n"); |
| 686 | mutex_unlock(&mon_lock); |
| 687 | return -ENODEV; |
| 688 | } |
| 689 | |
| 690 | rp = kzalloc(sizeof(struct mon_reader_bin), GFP_KERNEL); |
| 691 | if (rp == NULL) { |
| 692 | rc = -ENOMEM; |
| 693 | goto err_alloc; |
| 694 | } |
| 695 | spin_lock_init(&rp->b_lock); |
| 696 | init_waitqueue_head(&rp->b_wait); |
| 697 | mutex_init(&rp->fetch_lock); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 698 | rp->b_size = BUFF_DFL; |
| 699 | |
| 700 | size = sizeof(struct mon_pgmap) * (rp->b_size/CHUNK_SIZE); |
| 701 | if ((rp->b_vec = kzalloc(size, GFP_KERNEL)) == NULL) { |
| 702 | rc = -ENOMEM; |
| 703 | goto err_allocvec; |
| 704 | } |
| 705 | |
| 706 | if ((rc = mon_alloc_buff(rp->b_vec, rp->b_size/CHUNK_SIZE)) < 0) |
| 707 | goto err_allocbuff; |
| 708 | |
| 709 | rp->r.m_bus = mbus; |
| 710 | rp->r.r_data = rp; |
| 711 | rp->r.rnf_submit = mon_bin_submit; |
| 712 | rp->r.rnf_error = mon_bin_error; |
| 713 | rp->r.rnf_complete = mon_bin_complete; |
| 714 | |
| 715 | mon_reader_add(mbus, &rp->r); |
| 716 | |
| 717 | file->private_data = rp; |
| 718 | mutex_unlock(&mon_lock); |
| 719 | return 0; |
| 720 | |
| 721 | err_allocbuff: |
| 722 | kfree(rp->b_vec); |
| 723 | err_allocvec: |
| 724 | kfree(rp); |
| 725 | err_alloc: |
| 726 | mutex_unlock(&mon_lock); |
| 727 | return rc; |
| 728 | } |
| 729 | |
| 730 | /* |
| 731 | * Extract an event from buffer and copy it to user space. |
| 732 | * Wait if there is no event ready. |
| 733 | * Returns zero or error. |
| 734 | */ |
| 735 | 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] | 736 | struct mon_bin_hdr __user *hdr, unsigned int hdrbytes, |
| 737 | void __user *data, unsigned int nbytes) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 738 | { |
| 739 | unsigned long flags; |
| 740 | struct mon_bin_hdr *ep; |
| 741 | size_t step_len; |
| 742 | unsigned int offset; |
| 743 | int rc; |
| 744 | |
| 745 | mutex_lock(&rp->fetch_lock); |
| 746 | |
| 747 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { |
| 748 | mutex_unlock(&rp->fetch_lock); |
| 749 | return rc; |
| 750 | } |
| 751 | |
| 752 | ep = MON_OFF2HDR(rp, rp->b_out); |
| 753 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 754 | if (copy_to_user(hdr, ep, hdrbytes)) { |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 755 | mutex_unlock(&rp->fetch_lock); |
| 756 | return -EFAULT; |
| 757 | } |
| 758 | |
| 759 | step_len = min(ep->len_cap, nbytes); |
| 760 | if ((offset = rp->b_out + PKT_SIZE) >= rp->b_size) offset = 0; |
| 761 | |
| 762 | if (copy_from_buf(rp, offset, data, step_len)) { |
| 763 | mutex_unlock(&rp->fetch_lock); |
| 764 | return -EFAULT; |
| 765 | } |
| 766 | |
| 767 | spin_lock_irqsave(&rp->b_lock, flags); |
| 768 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); |
| 769 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 770 | rp->b_read = 0; |
| 771 | |
| 772 | mutex_unlock(&rp->fetch_lock); |
| 773 | return 0; |
| 774 | } |
| 775 | |
| 776 | static int mon_bin_release(struct inode *inode, struct file *file) |
| 777 | { |
| 778 | struct mon_reader_bin *rp = file->private_data; |
| 779 | struct mon_bus* mbus = rp->r.m_bus; |
| 780 | |
| 781 | mutex_lock(&mon_lock); |
| 782 | |
| 783 | if (mbus->nreaders <= 0) { |
| 784 | printk(KERN_ERR TAG ": consistency error on close\n"); |
| 785 | mutex_unlock(&mon_lock); |
| 786 | return 0; |
| 787 | } |
| 788 | mon_reader_del(mbus, &rp->r); |
| 789 | |
| 790 | mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE); |
| 791 | kfree(rp->b_vec); |
| 792 | kfree(rp); |
| 793 | |
| 794 | mutex_unlock(&mon_lock); |
| 795 | return 0; |
| 796 | } |
| 797 | |
| 798 | static ssize_t mon_bin_read(struct file *file, char __user *buf, |
| 799 | size_t nbytes, loff_t *ppos) |
| 800 | { |
| 801 | struct mon_reader_bin *rp = file->private_data; |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 802 | unsigned int hdrbytes = PKT_SZ_API0; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 803 | unsigned long flags; |
| 804 | struct mon_bin_hdr *ep; |
| 805 | unsigned int offset; |
| 806 | size_t step_len; |
| 807 | char *ptr; |
| 808 | ssize_t done = 0; |
| 809 | int rc; |
| 810 | |
| 811 | mutex_lock(&rp->fetch_lock); |
| 812 | |
| 813 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { |
| 814 | mutex_unlock(&rp->fetch_lock); |
| 815 | return rc; |
| 816 | } |
| 817 | |
| 818 | ep = MON_OFF2HDR(rp, rp->b_out); |
| 819 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 820 | if (rp->b_read < hdrbytes) { |
| 821 | step_len = min(nbytes, (size_t)(hdrbytes - rp->b_read)); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 822 | ptr = ((char *)ep) + rp->b_read; |
| 823 | if (step_len && copy_to_user(buf, ptr, step_len)) { |
| 824 | mutex_unlock(&rp->fetch_lock); |
| 825 | return -EFAULT; |
| 826 | } |
| 827 | nbytes -= step_len; |
| 828 | buf += step_len; |
| 829 | rp->b_read += step_len; |
| 830 | done += step_len; |
| 831 | } |
| 832 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 833 | if (rp->b_read >= hdrbytes) { |
Pete Zaitcev | f1c0a2a | 2008-11-14 09:47:41 -0700 | [diff] [blame] | 834 | step_len = ep->len_cap; |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 835 | step_len -= rp->b_read - hdrbytes; |
Pete Zaitcev | f1c0a2a | 2008-11-14 09:47:41 -0700 | [diff] [blame] | 836 | if (step_len > nbytes) |
| 837 | step_len = nbytes; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 838 | offset = rp->b_out + PKT_SIZE; |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 839 | offset += rp->b_read - hdrbytes; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 840 | if (offset >= rp->b_size) |
| 841 | offset -= rp->b_size; |
| 842 | if (copy_from_buf(rp, offset, buf, step_len)) { |
| 843 | mutex_unlock(&rp->fetch_lock); |
| 844 | return -EFAULT; |
| 845 | } |
| 846 | nbytes -= step_len; |
| 847 | buf += step_len; |
| 848 | rp->b_read += step_len; |
| 849 | done += step_len; |
| 850 | } |
| 851 | |
| 852 | /* |
| 853 | * Check if whole packet was read, and if so, jump to the next one. |
| 854 | */ |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 855 | if (rp->b_read >= hdrbytes + ep->len_cap) { |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 856 | spin_lock_irqsave(&rp->b_lock, flags); |
| 857 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); |
| 858 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 859 | rp->b_read = 0; |
| 860 | } |
| 861 | |
| 862 | mutex_unlock(&rp->fetch_lock); |
| 863 | return done; |
| 864 | } |
| 865 | |
| 866 | /* |
| 867 | * Remove at most nevents from chunked buffer. |
| 868 | * Returns the number of removed events. |
| 869 | */ |
| 870 | static int mon_bin_flush(struct mon_reader_bin *rp, unsigned nevents) |
| 871 | { |
| 872 | unsigned long flags; |
| 873 | struct mon_bin_hdr *ep; |
| 874 | int i; |
| 875 | |
| 876 | mutex_lock(&rp->fetch_lock); |
| 877 | spin_lock_irqsave(&rp->b_lock, flags); |
| 878 | for (i = 0; i < nevents; ++i) { |
| 879 | if (MON_RING_EMPTY(rp)) |
| 880 | break; |
| 881 | |
| 882 | ep = MON_OFF2HDR(rp, rp->b_out); |
| 883 | mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); |
| 884 | } |
| 885 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 886 | rp->b_read = 0; |
| 887 | mutex_unlock(&rp->fetch_lock); |
| 888 | return i; |
| 889 | } |
| 890 | |
| 891 | /* |
| 892 | * Fetch at most max event offsets into the buffer and put them into vec. |
| 893 | * The events are usually freed later with mon_bin_flush. |
| 894 | * Return the effective number of events fetched. |
| 895 | */ |
| 896 | static int mon_bin_fetch(struct file *file, struct mon_reader_bin *rp, |
| 897 | u32 __user *vec, unsigned int max) |
| 898 | { |
| 899 | unsigned int cur_out; |
| 900 | unsigned int bytes, avail; |
| 901 | unsigned int size; |
| 902 | unsigned int nevents; |
| 903 | struct mon_bin_hdr *ep; |
| 904 | unsigned long flags; |
| 905 | int rc; |
| 906 | |
| 907 | mutex_lock(&rp->fetch_lock); |
| 908 | |
| 909 | if ((rc = mon_bin_wait_event(file, rp)) < 0) { |
| 910 | mutex_unlock(&rp->fetch_lock); |
| 911 | return rc; |
| 912 | } |
| 913 | |
| 914 | spin_lock_irqsave(&rp->b_lock, flags); |
| 915 | avail = rp->b_cnt; |
| 916 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 917 | |
| 918 | cur_out = rp->b_out; |
| 919 | nevents = 0; |
| 920 | bytes = 0; |
| 921 | while (bytes < avail) { |
| 922 | if (nevents >= max) |
| 923 | break; |
| 924 | |
| 925 | ep = MON_OFF2HDR(rp, cur_out); |
| 926 | if (put_user(cur_out, &vec[nevents])) { |
| 927 | mutex_unlock(&rp->fetch_lock); |
| 928 | return -EFAULT; |
| 929 | } |
| 930 | |
| 931 | nevents++; |
| 932 | size = ep->len_cap + PKT_SIZE; |
| 933 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
| 934 | if ((cur_out += size) >= rp->b_size) |
| 935 | cur_out -= rp->b_size; |
| 936 | bytes += size; |
| 937 | } |
| 938 | |
| 939 | mutex_unlock(&rp->fetch_lock); |
| 940 | return nevents; |
| 941 | } |
| 942 | |
| 943 | /* |
| 944 | * Count events. This is almost the same as the above mon_bin_fetch, |
| 945 | * only we do not store offsets into user vector, and we have no limit. |
| 946 | */ |
| 947 | static int mon_bin_queued(struct mon_reader_bin *rp) |
| 948 | { |
| 949 | unsigned int cur_out; |
| 950 | unsigned int bytes, avail; |
| 951 | unsigned int size; |
| 952 | unsigned int nevents; |
| 953 | struct mon_bin_hdr *ep; |
| 954 | unsigned long flags; |
| 955 | |
| 956 | mutex_lock(&rp->fetch_lock); |
| 957 | |
| 958 | spin_lock_irqsave(&rp->b_lock, flags); |
| 959 | avail = rp->b_cnt; |
| 960 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 961 | |
| 962 | cur_out = rp->b_out; |
| 963 | nevents = 0; |
| 964 | bytes = 0; |
| 965 | while (bytes < avail) { |
| 966 | ep = MON_OFF2HDR(rp, cur_out); |
| 967 | |
| 968 | nevents++; |
| 969 | size = ep->len_cap + PKT_SIZE; |
| 970 | size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); |
| 971 | if ((cur_out += size) >= rp->b_size) |
| 972 | cur_out -= rp->b_size; |
| 973 | bytes += size; |
| 974 | } |
| 975 | |
| 976 | mutex_unlock(&rp->fetch_lock); |
| 977 | return nevents; |
| 978 | } |
| 979 | |
| 980 | /* |
| 981 | */ |
Arnd Bergmann | 3b759c7 | 2010-06-01 23:04:45 +0200 | [diff] [blame] | 982 | static long mon_bin_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 983 | { |
| 984 | struct mon_reader_bin *rp = file->private_data; |
| 985 | // struct mon_bus* mbus = rp->r.m_bus; |
| 986 | int ret = 0; |
| 987 | struct mon_bin_hdr *ep; |
| 988 | unsigned long flags; |
| 989 | |
| 990 | switch (cmd) { |
| 991 | |
| 992 | case MON_IOCQ_URB_LEN: |
| 993 | /* |
| 994 | * N.B. This only returns the size of data, without the header. |
| 995 | */ |
| 996 | spin_lock_irqsave(&rp->b_lock, flags); |
| 997 | if (!MON_RING_EMPTY(rp)) { |
| 998 | ep = MON_OFF2HDR(rp, rp->b_out); |
| 999 | ret = ep->len_cap; |
| 1000 | } |
| 1001 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 1002 | break; |
| 1003 | |
| 1004 | case MON_IOCQ_RING_SIZE: |
| 1005 | ret = rp->b_size; |
| 1006 | break; |
| 1007 | |
| 1008 | case MON_IOCT_RING_SIZE: |
| 1009 | /* |
| 1010 | * Changing the buffer size will flush it's contents; the new |
| 1011 | * buffer is allocated before releasing the old one to be sure |
| 1012 | * the device will stay functional also in case of memory |
| 1013 | * pressure. |
| 1014 | */ |
| 1015 | { |
| 1016 | int size; |
| 1017 | struct mon_pgmap *vec; |
| 1018 | |
| 1019 | if (arg < BUFF_MIN || arg > BUFF_MAX) |
| 1020 | return -EINVAL; |
| 1021 | |
| 1022 | size = CHUNK_ALIGN(arg); |
Greg Kroah-Hartman | 0296951 | 2015-04-30 11:32:56 +0200 | [diff] [blame] | 1023 | vec = kzalloc(sizeof(struct mon_pgmap) * (size / CHUNK_SIZE), GFP_KERNEL); |
| 1024 | if (vec == NULL) { |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1025 | ret = -ENOMEM; |
| 1026 | break; |
| 1027 | } |
| 1028 | |
| 1029 | ret = mon_alloc_buff(vec, size/CHUNK_SIZE); |
| 1030 | if (ret < 0) { |
| 1031 | kfree(vec); |
| 1032 | break; |
| 1033 | } |
| 1034 | |
| 1035 | mutex_lock(&rp->fetch_lock); |
| 1036 | spin_lock_irqsave(&rp->b_lock, flags); |
Steven Robertson | 33d973a | 2010-07-21 16:38:44 -0400 | [diff] [blame] | 1037 | mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1038 | kfree(rp->b_vec); |
| 1039 | rp->b_vec = vec; |
| 1040 | rp->b_size = size; |
| 1041 | rp->b_read = rp->b_in = rp->b_out = rp->b_cnt = 0; |
| 1042 | rp->cnt_lost = 0; |
| 1043 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 1044 | mutex_unlock(&rp->fetch_lock); |
| 1045 | } |
| 1046 | break; |
| 1047 | |
| 1048 | case MON_IOCH_MFLUSH: |
| 1049 | ret = mon_bin_flush(rp, arg); |
| 1050 | break; |
| 1051 | |
| 1052 | case MON_IOCX_GET: |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 1053 | case MON_IOCX_GETX: |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1054 | { |
| 1055 | struct mon_bin_get getb; |
| 1056 | |
| 1057 | if (copy_from_user(&getb, (void __user *)arg, |
| 1058 | sizeof(struct mon_bin_get))) |
| 1059 | return -EFAULT; |
| 1060 | |
| 1061 | if (getb.alloc > 0x10000000) /* Want to cast to u32 */ |
| 1062 | return -EINVAL; |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 1063 | ret = mon_bin_get_event(file, rp, getb.hdr, |
| 1064 | (cmd == MON_IOCX_GET)? PKT_SZ_API0: PKT_SZ_API1, |
| 1065 | getb.data, (unsigned int)getb.alloc); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1066 | } |
| 1067 | break; |
| 1068 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1069 | case MON_IOCX_MFETCH: |
| 1070 | { |
| 1071 | struct mon_bin_mfetch mfetch; |
| 1072 | struct mon_bin_mfetch __user *uptr; |
| 1073 | |
| 1074 | uptr = (struct mon_bin_mfetch __user *)arg; |
| 1075 | |
| 1076 | if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) |
| 1077 | return -EFAULT; |
| 1078 | |
| 1079 | if (mfetch.nflush) { |
| 1080 | ret = mon_bin_flush(rp, mfetch.nflush); |
| 1081 | if (ret < 0) |
| 1082 | return ret; |
| 1083 | if (put_user(ret, &uptr->nflush)) |
| 1084 | return -EFAULT; |
| 1085 | } |
| 1086 | ret = mon_bin_fetch(file, rp, mfetch.offvec, mfetch.nfetch); |
| 1087 | if (ret < 0) |
| 1088 | return ret; |
| 1089 | if (put_user(ret, &uptr->nfetch)) |
| 1090 | return -EFAULT; |
| 1091 | ret = 0; |
| 1092 | } |
| 1093 | break; |
| 1094 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1095 | case MON_IOCG_STATS: { |
| 1096 | struct mon_bin_stats __user *sp; |
| 1097 | unsigned int nevents; |
| 1098 | unsigned int ndropped; |
| 1099 | |
| 1100 | spin_lock_irqsave(&rp->b_lock, flags); |
| 1101 | ndropped = rp->cnt_lost; |
| 1102 | rp->cnt_lost = 0; |
| 1103 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 1104 | nevents = mon_bin_queued(rp); |
| 1105 | |
| 1106 | sp = (struct mon_bin_stats __user *)arg; |
Johannes Stezenbach | 236c448 | 2011-09-08 15:39:15 +0200 | [diff] [blame] | 1107 | if (put_user(ndropped, &sp->dropped)) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1108 | return -EFAULT; |
| 1109 | if (put_user(nevents, &sp->queued)) |
| 1110 | return -EFAULT; |
| 1111 | |
| 1112 | } |
| 1113 | break; |
| 1114 | |
| 1115 | default: |
| 1116 | return -ENOTTY; |
| 1117 | } |
| 1118 | |
| 1119 | return ret; |
| 1120 | } |
| 1121 | |
Pete Zaitcev | 7abce6b | 2008-12-20 12:56:08 -0700 | [diff] [blame] | 1122 | #ifdef CONFIG_COMPAT |
| 1123 | static long mon_bin_compat_ioctl(struct file *file, |
| 1124 | unsigned int cmd, unsigned long arg) |
| 1125 | { |
| 1126 | struct mon_reader_bin *rp = file->private_data; |
| 1127 | int ret; |
| 1128 | |
| 1129 | switch (cmd) { |
| 1130 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 1131 | case MON_IOCX_GET32: |
| 1132 | case MON_IOCX_GETX32: |
| 1133 | { |
Pete Zaitcev | 7abce6b | 2008-12-20 12:56:08 -0700 | [diff] [blame] | 1134 | struct mon_bin_get32 getb; |
| 1135 | |
| 1136 | if (copy_from_user(&getb, (void __user *)arg, |
| 1137 | sizeof(struct mon_bin_get32))) |
| 1138 | return -EFAULT; |
| 1139 | |
Pete Zaitcev | 471c604 | 2009-02-19 22:54:45 -0700 | [diff] [blame] | 1140 | ret = mon_bin_get_event(file, rp, compat_ptr(getb.hdr32), |
| 1141 | (cmd == MON_IOCX_GET32)? PKT_SZ_API0: PKT_SZ_API1, |
| 1142 | compat_ptr(getb.data32), getb.alloc32); |
Pete Zaitcev | 7abce6b | 2008-12-20 12:56:08 -0700 | [diff] [blame] | 1143 | if (ret < 0) |
| 1144 | return ret; |
| 1145 | } |
| 1146 | return 0; |
| 1147 | |
| 1148 | case MON_IOCX_MFETCH32: |
| 1149 | { |
| 1150 | struct mon_bin_mfetch32 mfetch; |
| 1151 | struct mon_bin_mfetch32 __user *uptr; |
| 1152 | |
| 1153 | uptr = (struct mon_bin_mfetch32 __user *) compat_ptr(arg); |
| 1154 | |
| 1155 | if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) |
| 1156 | return -EFAULT; |
| 1157 | |
| 1158 | if (mfetch.nflush32) { |
| 1159 | ret = mon_bin_flush(rp, mfetch.nflush32); |
| 1160 | if (ret < 0) |
| 1161 | return ret; |
| 1162 | if (put_user(ret, &uptr->nflush32)) |
| 1163 | return -EFAULT; |
| 1164 | } |
| 1165 | ret = mon_bin_fetch(file, rp, compat_ptr(mfetch.offvec32), |
| 1166 | mfetch.nfetch32); |
| 1167 | if (ret < 0) |
| 1168 | return ret; |
| 1169 | if (put_user(ret, &uptr->nfetch32)) |
| 1170 | return -EFAULT; |
| 1171 | } |
| 1172 | return 0; |
| 1173 | |
| 1174 | case MON_IOCG_STATS: |
Arnd Bergmann | 5592933 | 2010-04-27 00:24:05 +0200 | [diff] [blame] | 1175 | return mon_bin_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); |
Pete Zaitcev | 7abce6b | 2008-12-20 12:56:08 -0700 | [diff] [blame] | 1176 | |
| 1177 | case MON_IOCQ_URB_LEN: |
| 1178 | case MON_IOCQ_RING_SIZE: |
| 1179 | case MON_IOCT_RING_SIZE: |
| 1180 | case MON_IOCH_MFLUSH: |
Arnd Bergmann | 5592933 | 2010-04-27 00:24:05 +0200 | [diff] [blame] | 1181 | return mon_bin_ioctl(file, cmd, arg); |
Pete Zaitcev | 7abce6b | 2008-12-20 12:56:08 -0700 | [diff] [blame] | 1182 | |
| 1183 | default: |
| 1184 | ; |
| 1185 | } |
| 1186 | return -ENOTTY; |
| 1187 | } |
| 1188 | #endif /* CONFIG_COMPAT */ |
| 1189 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1190 | static unsigned int |
| 1191 | mon_bin_poll(struct file *file, struct poll_table_struct *wait) |
| 1192 | { |
| 1193 | struct mon_reader_bin *rp = file->private_data; |
| 1194 | unsigned int mask = 0; |
| 1195 | unsigned long flags; |
| 1196 | |
| 1197 | if (file->f_mode & FMODE_READ) |
| 1198 | poll_wait(file, &rp->b_wait, wait); |
| 1199 | |
| 1200 | spin_lock_irqsave(&rp->b_lock, flags); |
| 1201 | if (!MON_RING_EMPTY(rp)) |
| 1202 | mask |= POLLIN | POLLRDNORM; /* readable */ |
| 1203 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 1204 | return mask; |
| 1205 | } |
| 1206 | |
| 1207 | /* |
| 1208 | * open and close: just keep track of how many times the device is |
| 1209 | * mapped, to use the proper memory allocation function. |
| 1210 | */ |
| 1211 | static void mon_bin_vma_open(struct vm_area_struct *vma) |
| 1212 | { |
| 1213 | struct mon_reader_bin *rp = vma->vm_private_data; |
| 1214 | rp->mmap_active++; |
| 1215 | } |
| 1216 | |
| 1217 | static void mon_bin_vma_close(struct vm_area_struct *vma) |
| 1218 | { |
| 1219 | struct mon_reader_bin *rp = vma->vm_private_data; |
| 1220 | rp->mmap_active--; |
| 1221 | } |
| 1222 | |
| 1223 | /* |
| 1224 | * Map ring pages to user space. |
| 1225 | */ |
Nick Piggin | 041509d | 2007-12-13 16:15:35 -0800 | [diff] [blame] | 1226 | 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] | 1227 | { |
| 1228 | struct mon_reader_bin *rp = vma->vm_private_data; |
| 1229 | unsigned long offset, chunk_idx; |
| 1230 | struct page *pageptr; |
| 1231 | |
Nick Piggin | 041509d | 2007-12-13 16:15:35 -0800 | [diff] [blame] | 1232 | offset = vmf->pgoff << PAGE_SHIFT; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1233 | if (offset >= rp->b_size) |
Nick Piggin | 041509d | 2007-12-13 16:15:35 -0800 | [diff] [blame] | 1234 | return VM_FAULT_SIGBUS; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1235 | chunk_idx = offset / CHUNK_SIZE; |
| 1236 | pageptr = rp->b_vec[chunk_idx].pg; |
| 1237 | get_page(pageptr); |
Nick Piggin | 041509d | 2007-12-13 16:15:35 -0800 | [diff] [blame] | 1238 | vmf->page = pageptr; |
| 1239 | return 0; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1240 | } |
| 1241 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 1242 | static const struct vm_operations_struct mon_bin_vm_ops = { |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1243 | .open = mon_bin_vma_open, |
| 1244 | .close = mon_bin_vma_close, |
Nick Piggin | 041509d | 2007-12-13 16:15:35 -0800 | [diff] [blame] | 1245 | .fault = mon_bin_vma_fault, |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1246 | }; |
| 1247 | |
Pete Zaitcev | 454459b | 2008-03-19 22:29:51 -0700 | [diff] [blame] | 1248 | 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] | 1249 | { |
Nick Piggin | 041509d | 2007-12-13 16:15:35 -0800 | [diff] [blame] | 1250 | /* don't do anything here: "fault" will set up page table entries */ |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1251 | vma->vm_ops = &mon_bin_vm_ops; |
Konstantin Khlebnikov | 314e51b | 2012-10-08 16:29:02 -0700 | [diff] [blame] | 1252 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1253 | vma->vm_private_data = filp->private_data; |
| 1254 | mon_bin_vma_open(vma); |
| 1255 | return 0; |
| 1256 | } |
| 1257 | |
Jan Engelhardt | 0b3f5fe | 2008-01-22 20:51:11 +0100 | [diff] [blame] | 1258 | static const struct file_operations mon_fops_binary = { |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1259 | .owner = THIS_MODULE, |
| 1260 | .open = mon_bin_open, |
| 1261 | .llseek = no_llseek, |
| 1262 | .read = mon_bin_read, |
| 1263 | /* .write = mon_text_write, */ |
| 1264 | .poll = mon_bin_poll, |
Arnd Bergmann | 3b759c7 | 2010-06-01 23:04:45 +0200 | [diff] [blame] | 1265 | .unlocked_ioctl = mon_bin_ioctl, |
Pete Zaitcev | 7abce6b | 2008-12-20 12:56:08 -0700 | [diff] [blame] | 1266 | #ifdef CONFIG_COMPAT |
| 1267 | .compat_ioctl = mon_bin_compat_ioctl, |
| 1268 | #endif |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1269 | .release = mon_bin_release, |
Pete Zaitcev | 454459b | 2008-03-19 22:29:51 -0700 | [diff] [blame] | 1270 | .mmap = mon_bin_mmap, |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1271 | }; |
| 1272 | |
| 1273 | static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp) |
| 1274 | { |
| 1275 | DECLARE_WAITQUEUE(waita, current); |
| 1276 | unsigned long flags; |
| 1277 | |
| 1278 | add_wait_queue(&rp->b_wait, &waita); |
| 1279 | set_current_state(TASK_INTERRUPTIBLE); |
| 1280 | |
| 1281 | spin_lock_irqsave(&rp->b_lock, flags); |
| 1282 | while (MON_RING_EMPTY(rp)) { |
| 1283 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 1284 | |
| 1285 | if (file->f_flags & O_NONBLOCK) { |
| 1286 | set_current_state(TASK_RUNNING); |
| 1287 | remove_wait_queue(&rp->b_wait, &waita); |
| 1288 | return -EWOULDBLOCK; /* Same as EAGAIN in Linux */ |
| 1289 | } |
| 1290 | schedule(); |
| 1291 | if (signal_pending(current)) { |
| 1292 | remove_wait_queue(&rp->b_wait, &waita); |
| 1293 | return -EINTR; |
| 1294 | } |
| 1295 | set_current_state(TASK_INTERRUPTIBLE); |
| 1296 | |
| 1297 | spin_lock_irqsave(&rp->b_lock, flags); |
| 1298 | } |
| 1299 | spin_unlock_irqrestore(&rp->b_lock, flags); |
| 1300 | |
| 1301 | set_current_state(TASK_RUNNING); |
| 1302 | remove_wait_queue(&rp->b_wait, &waita); |
| 1303 | return 0; |
| 1304 | } |
| 1305 | |
| 1306 | static int mon_alloc_buff(struct mon_pgmap *map, int npages) |
| 1307 | { |
| 1308 | int n; |
| 1309 | unsigned long vaddr; |
| 1310 | |
| 1311 | for (n = 0; n < npages; n++) { |
| 1312 | vaddr = get_zeroed_page(GFP_KERNEL); |
| 1313 | if (vaddr == 0) { |
| 1314 | while (n-- != 0) |
| 1315 | free_page((unsigned long) map[n].ptr); |
| 1316 | return -ENOMEM; |
| 1317 | } |
| 1318 | map[n].ptr = (unsigned char *) vaddr; |
Kevin Cernekee | 5bfd756 | 2009-07-05 12:08:19 -0700 | [diff] [blame] | 1319 | map[n].pg = virt_to_page((void *) vaddr); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1320 | } |
| 1321 | return 0; |
| 1322 | } |
| 1323 | |
| 1324 | static void mon_free_buff(struct mon_pgmap *map, int npages) |
| 1325 | { |
| 1326 | int n; |
| 1327 | |
| 1328 | for (n = 0; n < npages; n++) |
| 1329 | free_page((unsigned long) map[n].ptr); |
| 1330 | } |
| 1331 | |
Pete Zaitcev | ce7cd137f | 2007-05-03 16:51:16 -0700 | [diff] [blame] | 1332 | int mon_bin_add(struct mon_bus *mbus, const struct usb_bus *ubus) |
| 1333 | { |
| 1334 | struct device *dev; |
| 1335 | unsigned minor = ubus? ubus->busnum: 0; |
| 1336 | |
| 1337 | if (minor >= MON_BIN_MAX_MINOR) |
| 1338 | return 0; |
| 1339 | |
Greg Kroah-Hartman | b0b090e | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 1340 | dev = device_create(mon_bin_class, ubus ? ubus->controller : NULL, |
| 1341 | MKDEV(MAJOR(mon_bin_dev0), minor), NULL, |
| 1342 | "usbmon%d", minor); |
Pete Zaitcev | ce7cd137f | 2007-05-03 16:51:16 -0700 | [diff] [blame] | 1343 | if (IS_ERR(dev)) |
| 1344 | return 0; |
| 1345 | |
| 1346 | mbus->classdev = dev; |
| 1347 | return 1; |
| 1348 | } |
| 1349 | |
| 1350 | void mon_bin_del(struct mon_bus *mbus) |
| 1351 | { |
| 1352 | device_destroy(mon_bin_class, mbus->classdev->devt); |
| 1353 | } |
| 1354 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1355 | int __init mon_bin_init(void) |
| 1356 | { |
| 1357 | int rc; |
| 1358 | |
Pete Zaitcev | ce7cd137f | 2007-05-03 16:51:16 -0700 | [diff] [blame] | 1359 | mon_bin_class = class_create(THIS_MODULE, "usbmon"); |
| 1360 | if (IS_ERR(mon_bin_class)) { |
| 1361 | rc = PTR_ERR(mon_bin_class); |
| 1362 | goto err_class; |
| 1363 | } |
| 1364 | |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1365 | rc = alloc_chrdev_region(&mon_bin_dev0, 0, MON_BIN_MAX_MINOR, "usbmon"); |
| 1366 | if (rc < 0) |
| 1367 | goto err_dev; |
| 1368 | |
| 1369 | cdev_init(&mon_bin_cdev, &mon_fops_binary); |
| 1370 | mon_bin_cdev.owner = THIS_MODULE; |
| 1371 | |
| 1372 | rc = cdev_add(&mon_bin_cdev, mon_bin_dev0, MON_BIN_MAX_MINOR); |
| 1373 | if (rc < 0) |
| 1374 | goto err_add; |
| 1375 | |
| 1376 | return 0; |
| 1377 | |
| 1378 | err_add: |
| 1379 | unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); |
| 1380 | err_dev: |
Pete Zaitcev | ce7cd137f | 2007-05-03 16:51:16 -0700 | [diff] [blame] | 1381 | class_destroy(mon_bin_class); |
| 1382 | err_class: |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1383 | return rc; |
| 1384 | } |
| 1385 | |
Pete Zaitcev | 21641e3 | 2007-02-20 10:37:52 -0800 | [diff] [blame] | 1386 | void mon_bin_exit(void) |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1387 | { |
| 1388 | cdev_del(&mon_bin_cdev); |
| 1389 | unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); |
Pete Zaitcev | ce7cd137f | 2007-05-03 16:51:16 -0700 | [diff] [blame] | 1390 | class_destroy(mon_bin_class); |
Pete Zaitcev | 6f23ee1 | 2006-12-30 22:43:10 -0800 | [diff] [blame] | 1391 | } |