1 /* 2 * History: 3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), 4 * to allow user process control of SCSI devices. 5 * Development Sponsored by Killy Corp. NY NY 6 * 7 * Original driver (sg.c): 8 * Copyright (C) 1992 Lawrence Foard 9 * Version 2 and 3 extensions to driver: 10 * Copyright (C) 1998 - 2005 Douglas Gilbert 11 * 12 * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 */ 20 21 static int sg_version_num = 30534; /* 2 digits for each component */ 22 #define SG_VERSION_STR "3.5.34" 23 24 /* 25 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes: 26 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First 27 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING 28 * (otherwise the macros compile to empty statements). 29 * 30 */ 31 #include <linux/module.h> 32 33 #include <linux/fs.h> 34 #include <linux/kernel.h> 35 #include <linux/sched.h> 36 #include <linux/string.h> 37 #include <linux/mm.h> 38 #include <linux/errno.h> 39 #include <linux/mtio.h> 40 #include <linux/ioctl.h> 41 #include <linux/fcntl.h> 42 #include <linux/init.h> 43 #include <linux/poll.h> 44 #include <linux/moduleparam.h> 45 #include <linux/cdev.h> 46 #include <linux/idr.h> 47 #include <linux/seq_file.h> 48 #include <linux/blkdev.h> 49 #include <linux/delay.h> 50 #include <linux/blktrace_api.h> 51 #include <linux/smp_lock.h> 52 53 #include "scsi.h" 54 #include <scsi/scsi_dbg.h> 55 #include <scsi/scsi_host.h> 56 #include <scsi/scsi_driver.h> 57 #include <scsi/scsi_ioctl.h> 58 #include <scsi/sg.h> 59 60 #include "scsi_logging.h" 61 62 #ifdef CONFIG_SCSI_PROC_FS 63 #include <linux/proc_fs.h> 64 static char *sg_version_date = "20061027"; 65 66 static int sg_proc_init(void); 67 static void sg_proc_cleanup(void); 68 #endif 69 70 #define SG_ALLOW_DIO_DEF 0 71 72 #define SG_MAX_DEVS 32768 73 74 /* 75 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 76 * Then when using 32 bit integers x * m may overflow during the calculation. 77 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 78 * calculates the same, but prevents the overflow when both m and d 79 * are "small" numbers (like HZ and USER_HZ). 80 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 81 * in 32 bits. 82 */ 83 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 84 85 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 86 87 int sg_big_buff = SG_DEF_RESERVED_SIZE; 88 /* N.B. This variable is readable and writeable via 89 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 90 of this size (or less if there is not enough memory) will be reserved 91 for use by this file descriptor. [Deprecated usage: this variable is also 92 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 93 the kernel (i.e. it is not a module).] */ 94 static int def_reserved_size = -1; /* picks up init parameter */ 95 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 96 97 static int scatter_elem_sz = SG_SCATTER_SZ; 98 static int scatter_elem_sz_prev = SG_SCATTER_SZ; 99 100 #define SG_SECTOR_SZ 512 101 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) 102 103 static int sg_add(struct device *, struct class_interface *); 104 static void sg_remove(struct device *, struct class_interface *); 105 106 static DEFINE_IDR(sg_index_idr); 107 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock 108 file descriptor list for device */ 109 110 static struct class_interface sg_interface = { 111 .add_dev = sg_add, 112 .remove_dev = sg_remove, 113 }; 114 115 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 116 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 117 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ 118 unsigned bufflen; /* Size of (aggregate) data buffer */ 119 struct page **pages; 120 int page_order; 121 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 122 unsigned char cmd_opcode; /* first byte of command */ 123 } Sg_scatter_hold; 124 125 struct sg_device; /* forward declarations */ 126 struct sg_fd; 127 128 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 129 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 130 struct sg_fd *parentfp; /* NULL -> not in use */ 131 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 132 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 133 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; 134 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 135 char orphan; /* 1 -> drop on sight, 0 -> normal */ 136 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 137 volatile char done; /* 0->before bh, 1->before read, 2->read */ 138 struct request *rq; 139 struct bio *bio; 140 } Sg_request; 141 142 typedef struct sg_fd { /* holds the state of a file descriptor */ 143 struct sg_fd *nextfp; /* NULL when last opened fd on this device */ 144 struct sg_device *parentdp; /* owning device */ 145 wait_queue_head_t read_wait; /* queue read until command done */ 146 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 147 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 148 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 149 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 150 unsigned save_scat_len; /* original length of trunc. scat. element */ 151 Sg_request *headrp; /* head of request slist, NULL->empty */ 152 struct fasync_struct *async_qp; /* used by asynchronous notification */ 153 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 154 char low_dma; /* as in parent but possibly overridden to 1 */ 155 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 156 volatile char closed; /* 1 -> fd closed but request(s) outstanding */ 157 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 158 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ 159 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 160 char mmap_called; /* 0 -> mmap() never called on this fd */ 161 } Sg_fd; 162 163 typedef struct sg_device { /* holds the state of each scsi generic device */ 164 struct scsi_device *device; 165 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ 166 int sg_tablesize; /* adapter's max scatter-gather table size */ 167 u32 index; /* device index number */ 168 Sg_fd *headfp; /* first open fd belonging to this device */ 169 volatile char detached; /* 0->attached, 1->detached pending removal */ 170 volatile char exclude; /* opened for exclusive access */ 171 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 172 struct gendisk *disk; 173 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 174 } Sg_device; 175 176 static int sg_fasync(int fd, struct file *filp, int mode); 177 /* tasklet or soft irq callback */ 178 static void sg_rq_end_io(struct request *rq, int uptodate); 179 static int sg_start_req(Sg_request *srp, unsigned char *cmd); 180 static void sg_finish_rem_req(Sg_request * srp); 181 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 182 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, 183 int tablesize); 184 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 185 Sg_request * srp); 186 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, 187 const char __user *buf, size_t count, int blocking, 188 int read_only, Sg_request **o_srp); 189 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 190 unsigned char *cmnd, int timeout, int blocking); 191 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 192 static void sg_remove_scat(Sg_scatter_hold * schp); 193 static void sg_build_reserve(Sg_fd * sfp, int req_size); 194 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 195 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 196 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 197 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 198 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 199 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 200 static Sg_request *sg_add_request(Sg_fd * sfp); 201 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 202 static int sg_res_in_use(Sg_fd * sfp); 203 static Sg_device *sg_get_dev(int dev); 204 #ifdef CONFIG_SCSI_PROC_FS 205 static int sg_last_dev(void); 206 #endif 207 208 #define SZ_SG_HEADER sizeof(struct sg_header) 209 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 210 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 211 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 212 213 static int sg_allow_access(struct file *filp, unsigned char *cmd) 214 { 215 struct sg_fd *sfp = (struct sg_fd *)filp->private_data; 216 struct request_queue *q = sfp->parentdp->device->request_queue; 217 218 if (sfp->parentdp->device->type == TYPE_SCANNER) 219 return 0; 220 221 return blk_verify_command(&q->cmd_filter, 222 cmd, filp->f_mode & FMODE_WRITE); 223 } 224 225 static int 226 sg_open(struct inode *inode, struct file *filp) 227 { 228 int dev = iminor(inode); 229 int flags = filp->f_flags; 230 struct request_queue *q; 231 Sg_device *sdp; 232 Sg_fd *sfp; 233 int res; 234 int retval; 235 236 lock_kernel(); 237 nonseekable_open(inode, filp); 238 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 239 sdp = sg_get_dev(dev); 240 if ((!sdp) || (!sdp->device)) { 241 unlock_kernel(); 242 return -ENXIO; 243 } 244 if (sdp->detached) { 245 unlock_kernel(); 246 return -ENODEV; 247 } 248 249 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 250 /* Prevent the device driver from vanishing while we sleep */ 251 retval = scsi_device_get(sdp->device); 252 if (retval) { 253 unlock_kernel(); 254 return retval; 255 } 256 257 if (!((flags & O_NONBLOCK) || 258 scsi_block_when_processing_errors(sdp->device))) { 259 retval = -ENXIO; 260 /* we are in error recovery for this device */ 261 goto error_out; 262 } 263 264 if (flags & O_EXCL) { 265 if (O_RDONLY == (flags & O_ACCMODE)) { 266 retval = -EPERM; /* Can't lock it with read only access */ 267 goto error_out; 268 } 269 if (sdp->headfp && (flags & O_NONBLOCK)) { 270 retval = -EBUSY; 271 goto error_out; 272 } 273 res = 0; 274 __wait_event_interruptible(sdp->o_excl_wait, 275 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); 276 if (res) { 277 retval = res; /* -ERESTARTSYS because signal hit process */ 278 goto error_out; 279 } 280 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ 281 if (flags & O_NONBLOCK) { 282 retval = -EBUSY; 283 goto error_out; 284 } 285 res = 0; 286 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), 287 res); 288 if (res) { 289 retval = res; /* -ERESTARTSYS because signal hit process */ 290 goto error_out; 291 } 292 } 293 if (sdp->detached) { 294 retval = -ENODEV; 295 goto error_out; 296 } 297 if (!sdp->headfp) { /* no existing opens on this device */ 298 sdp->sgdebug = 0; 299 q = sdp->device->request_queue; 300 sdp->sg_tablesize = min(q->max_hw_segments, 301 q->max_phys_segments); 302 } 303 if ((sfp = sg_add_sfp(sdp, dev))) 304 filp->private_data = sfp; 305 else { 306 if (flags & O_EXCL) 307 sdp->exclude = 0; /* undo if error */ 308 retval = -ENOMEM; 309 goto error_out; 310 } 311 unlock_kernel(); 312 return 0; 313 314 error_out: 315 scsi_device_put(sdp->device); 316 unlock_kernel(); 317 return retval; 318 } 319 320 /* Following function was formerly called 'sg_close' */ 321 static int 322 sg_release(struct inode *inode, struct file *filp) 323 { 324 Sg_device *sdp; 325 Sg_fd *sfp; 326 327 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 328 return -ENXIO; 329 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 330 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ 331 if (!sdp->detached) { 332 scsi_device_put(sdp->device); 333 } 334 sdp->exclude = 0; 335 wake_up_interruptible(&sdp->o_excl_wait); 336 } 337 return 0; 338 } 339 340 static ssize_t 341 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 342 { 343 Sg_device *sdp; 344 Sg_fd *sfp; 345 Sg_request *srp; 346 int req_pack_id = -1; 347 sg_io_hdr_t *hp; 348 struct sg_header *old_hdr = NULL; 349 int retval = 0; 350 351 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 352 return -ENXIO; 353 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 354 sdp->disk->disk_name, (int) count)); 355 356 if (!access_ok(VERIFY_WRITE, buf, count)) 357 return -EFAULT; 358 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 359 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 360 if (!old_hdr) 361 return -ENOMEM; 362 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 363 retval = -EFAULT; 364 goto free_old_hdr; 365 } 366 if (old_hdr->reply_len < 0) { 367 if (count >= SZ_SG_IO_HDR) { 368 sg_io_hdr_t *new_hdr; 369 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 370 if (!new_hdr) { 371 retval = -ENOMEM; 372 goto free_old_hdr; 373 } 374 retval =__copy_from_user 375 (new_hdr, buf, SZ_SG_IO_HDR); 376 req_pack_id = new_hdr->pack_id; 377 kfree(new_hdr); 378 if (retval) { 379 retval = -EFAULT; 380 goto free_old_hdr; 381 } 382 } 383 } else 384 req_pack_id = old_hdr->pack_id; 385 } 386 srp = sg_get_rq_mark(sfp, req_pack_id); 387 if (!srp) { /* now wait on packet to arrive */ 388 if (sdp->detached) { 389 retval = -ENODEV; 390 goto free_old_hdr; 391 } 392 if (filp->f_flags & O_NONBLOCK) { 393 retval = -EAGAIN; 394 goto free_old_hdr; 395 } 396 while (1) { 397 retval = 0; /* following macro beats race condition */ 398 __wait_event_interruptible(sfp->read_wait, 399 (sdp->detached || 400 (srp = sg_get_rq_mark(sfp, req_pack_id))), 401 retval); 402 if (sdp->detached) { 403 retval = -ENODEV; 404 goto free_old_hdr; 405 } 406 if (0 == retval) 407 break; 408 409 /* -ERESTARTSYS as signal hit process */ 410 goto free_old_hdr; 411 } 412 } 413 if (srp->header.interface_id != '\0') { 414 retval = sg_new_read(sfp, buf, count, srp); 415 goto free_old_hdr; 416 } 417 418 hp = &srp->header; 419 if (old_hdr == NULL) { 420 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 421 if (! old_hdr) { 422 retval = -ENOMEM; 423 goto free_old_hdr; 424 } 425 } 426 memset(old_hdr, 0, SZ_SG_HEADER); 427 old_hdr->reply_len = (int) hp->timeout; 428 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 429 old_hdr->pack_id = hp->pack_id; 430 old_hdr->twelve_byte = 431 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 432 old_hdr->target_status = hp->masked_status; 433 old_hdr->host_status = hp->host_status; 434 old_hdr->driver_status = hp->driver_status; 435 if ((CHECK_CONDITION & hp->masked_status) || 436 (DRIVER_SENSE & hp->driver_status)) 437 memcpy(old_hdr->sense_buffer, srp->sense_b, 438 sizeof (old_hdr->sense_buffer)); 439 switch (hp->host_status) { 440 /* This setup of 'result' is for backward compatibility and is best 441 ignored by the user who should use target, host + driver status */ 442 case DID_OK: 443 case DID_PASSTHROUGH: 444 case DID_SOFT_ERROR: 445 old_hdr->result = 0; 446 break; 447 case DID_NO_CONNECT: 448 case DID_BUS_BUSY: 449 case DID_TIME_OUT: 450 old_hdr->result = EBUSY; 451 break; 452 case DID_BAD_TARGET: 453 case DID_ABORT: 454 case DID_PARITY: 455 case DID_RESET: 456 case DID_BAD_INTR: 457 old_hdr->result = EIO; 458 break; 459 case DID_ERROR: 460 old_hdr->result = (srp->sense_b[0] == 0 && 461 hp->masked_status == GOOD) ? 0 : EIO; 462 break; 463 default: 464 old_hdr->result = EIO; 465 break; 466 } 467 468 /* Now copy the result back to the user buffer. */ 469 if (count >= SZ_SG_HEADER) { 470 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 471 retval = -EFAULT; 472 goto free_old_hdr; 473 } 474 buf += SZ_SG_HEADER; 475 if (count > old_hdr->reply_len) 476 count = old_hdr->reply_len; 477 if (count > SZ_SG_HEADER) { 478 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 479 retval = -EFAULT; 480 goto free_old_hdr; 481 } 482 } 483 } else 484 count = (old_hdr->result == 0) ? 0 : -EIO; 485 sg_finish_rem_req(srp); 486 retval = count; 487 free_old_hdr: 488 kfree(old_hdr); 489 return retval; 490 } 491 492 static ssize_t 493 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 494 { 495 sg_io_hdr_t *hp = &srp->header; 496 int err = 0; 497 int len; 498 499 if (count < SZ_SG_IO_HDR) { 500 err = -EINVAL; 501 goto err_out; 502 } 503 hp->sb_len_wr = 0; 504 if ((hp->mx_sb_len > 0) && hp->sbp) { 505 if ((CHECK_CONDITION & hp->masked_status) || 506 (DRIVER_SENSE & hp->driver_status)) { 507 int sb_len = SCSI_SENSE_BUFFERSIZE; 508 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 509 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 510 len = (len > sb_len) ? sb_len : len; 511 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 512 err = -EFAULT; 513 goto err_out; 514 } 515 hp->sb_len_wr = len; 516 } 517 } 518 if (hp->masked_status || hp->host_status || hp->driver_status) 519 hp->info |= SG_INFO_CHECK; 520 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 521 err = -EFAULT; 522 goto err_out; 523 } 524 err_out: 525 sg_finish_rem_req(srp); 526 return (0 == err) ? count : err; 527 } 528 529 static ssize_t 530 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 531 { 532 int mxsize, cmd_size, k; 533 int input_size, blocking; 534 unsigned char opcode; 535 Sg_device *sdp; 536 Sg_fd *sfp; 537 Sg_request *srp; 538 struct sg_header old_hdr; 539 sg_io_hdr_t *hp; 540 unsigned char cmnd[MAX_COMMAND_SIZE]; 541 542 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 543 return -ENXIO; 544 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 545 sdp->disk->disk_name, (int) count)); 546 if (sdp->detached) 547 return -ENODEV; 548 if (!((filp->f_flags & O_NONBLOCK) || 549 scsi_block_when_processing_errors(sdp->device))) 550 return -ENXIO; 551 552 if (!access_ok(VERIFY_READ, buf, count)) 553 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 554 if (count < SZ_SG_HEADER) 555 return -EIO; 556 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 557 return -EFAULT; 558 blocking = !(filp->f_flags & O_NONBLOCK); 559 if (old_hdr.reply_len < 0) 560 return sg_new_write(sfp, filp, buf, count, blocking, 0, NULL); 561 if (count < (SZ_SG_HEADER + 6)) 562 return -EIO; /* The minimum scsi command length is 6 bytes. */ 563 564 if (!(srp = sg_add_request(sfp))) { 565 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 566 return -EDOM; 567 } 568 buf += SZ_SG_HEADER; 569 __get_user(opcode, buf); 570 if (sfp->next_cmd_len > 0) { 571 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 572 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 573 sfp->next_cmd_len = 0; 574 sg_remove_request(sfp, srp); 575 return -EIO; 576 } 577 cmd_size = sfp->next_cmd_len; 578 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 579 } else { 580 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 581 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 582 cmd_size = 12; 583 } 584 SCSI_LOG_TIMEOUT(4, printk( 585 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 586 /* Determine buffer size. */ 587 input_size = count - cmd_size; 588 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 589 mxsize -= SZ_SG_HEADER; 590 input_size -= SZ_SG_HEADER; 591 if (input_size < 0) { 592 sg_remove_request(sfp, srp); 593 return -EIO; /* User did not pass enough bytes for this command. */ 594 } 595 hp = &srp->header; 596 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 597 hp->cmd_len = (unsigned char) cmd_size; 598 hp->iovec_count = 0; 599 hp->mx_sb_len = 0; 600 if (input_size > 0) 601 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 602 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 603 else 604 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 605 hp->dxfer_len = mxsize; 606 if (hp->dxfer_direction == SG_DXFER_TO_DEV) 607 hp->dxferp = (char __user *)buf + cmd_size; 608 else 609 hp->dxferp = NULL; 610 hp->sbp = NULL; 611 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 612 hp->flags = input_size; /* structure abuse ... */ 613 hp->pack_id = old_hdr.pack_id; 614 hp->usr_ptr = NULL; 615 if (__copy_from_user(cmnd, buf, cmd_size)) 616 return -EFAULT; 617 /* 618 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 619 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 620 * is a non-zero input_size, so emit a warning. 621 */ 622 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { 623 static char cmd[TASK_COMM_LEN]; 624 if (strcmp(current->comm, cmd) && printk_ratelimit()) { 625 printk(KERN_WARNING 626 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" 627 "guessing data in;\n" KERN_WARNING " " 628 "program %s not setting count and/or reply_len properly\n", 629 old_hdr.reply_len - (int)SZ_SG_HEADER, 630 input_size, (unsigned int) cmnd[0], 631 current->comm); 632 strcpy(cmd, current->comm); 633 } 634 } 635 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 636 return (k < 0) ? k : count; 637 } 638 639 static ssize_t 640 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, 641 size_t count, int blocking, int read_only, 642 Sg_request **o_srp) 643 { 644 int k; 645 Sg_request *srp; 646 sg_io_hdr_t *hp; 647 unsigned char cmnd[MAX_COMMAND_SIZE]; 648 int timeout; 649 unsigned long ul_timeout; 650 651 if (count < SZ_SG_IO_HDR) 652 return -EINVAL; 653 if (!access_ok(VERIFY_READ, buf, count)) 654 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 655 656 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 657 if (!(srp = sg_add_request(sfp))) { 658 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 659 return -EDOM; 660 } 661 hp = &srp->header; 662 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 663 sg_remove_request(sfp, srp); 664 return -EFAULT; 665 } 666 if (hp->interface_id != 'S') { 667 sg_remove_request(sfp, srp); 668 return -ENOSYS; 669 } 670 if (hp->flags & SG_FLAG_MMAP_IO) { 671 if (hp->dxfer_len > sfp->reserve.bufflen) { 672 sg_remove_request(sfp, srp); 673 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 674 } 675 if (hp->flags & SG_FLAG_DIRECT_IO) { 676 sg_remove_request(sfp, srp); 677 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 678 } 679 if (sg_res_in_use(sfp)) { 680 sg_remove_request(sfp, srp); 681 return -EBUSY; /* reserve buffer already being used */ 682 } 683 } 684 ul_timeout = msecs_to_jiffies(srp->header.timeout); 685 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 686 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 687 sg_remove_request(sfp, srp); 688 return -EMSGSIZE; 689 } 690 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 691 sg_remove_request(sfp, srp); 692 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 693 } 694 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 695 sg_remove_request(sfp, srp); 696 return -EFAULT; 697 } 698 if (read_only && sg_allow_access(file, cmnd)) { 699 sg_remove_request(sfp, srp); 700 return -EPERM; 701 } 702 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 703 if (k < 0) 704 return k; 705 if (o_srp) 706 *o_srp = srp; 707 return count; 708 } 709 710 static int 711 sg_common_write(Sg_fd * sfp, Sg_request * srp, 712 unsigned char *cmnd, int timeout, int blocking) 713 { 714 int k, data_dir; 715 Sg_device *sdp = sfp->parentdp; 716 sg_io_hdr_t *hp = &srp->header; 717 718 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 719 hp->status = 0; 720 hp->masked_status = 0; 721 hp->msg_status = 0; 722 hp->info = 0; 723 hp->host_status = 0; 724 hp->driver_status = 0; 725 hp->resid = 0; 726 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 727 (int) cmnd[0], (int) hp->cmd_len)); 728 729 k = sg_start_req(srp, cmnd); 730 if (k) { 731 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); 732 sg_finish_rem_req(srp); 733 return k; /* probably out of space --> ENOMEM */ 734 } 735 if (sdp->detached) { 736 sg_finish_rem_req(srp); 737 return -ENODEV; 738 } 739 740 switch (hp->dxfer_direction) { 741 case SG_DXFER_TO_FROM_DEV: 742 case SG_DXFER_FROM_DEV: 743 data_dir = DMA_FROM_DEVICE; 744 break; 745 case SG_DXFER_TO_DEV: 746 data_dir = DMA_TO_DEVICE; 747 break; 748 case SG_DXFER_UNKNOWN: 749 data_dir = DMA_BIDIRECTIONAL; 750 break; 751 default: 752 data_dir = DMA_NONE; 753 break; 754 } 755 hp->duration = jiffies_to_msecs(jiffies); 756 757 srp->rq->timeout = timeout; 758 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, 759 srp->rq, 1, sg_rq_end_io); 760 return 0; 761 } 762 763 static int 764 sg_srp_done(Sg_request *srp, Sg_fd *sfp) 765 { 766 unsigned long iflags; 767 int done; 768 769 read_lock_irqsave(&sfp->rq_list_lock, iflags); 770 done = srp->done; 771 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 772 return done; 773 } 774 775 static int 776 sg_ioctl(struct inode *inode, struct file *filp, 777 unsigned int cmd_in, unsigned long arg) 778 { 779 void __user *p = (void __user *)arg; 780 int __user *ip = p; 781 int result, val, read_only; 782 Sg_device *sdp; 783 Sg_fd *sfp; 784 Sg_request *srp; 785 unsigned long iflags; 786 787 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 788 return -ENXIO; 789 790 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 791 sdp->disk->disk_name, (int) cmd_in)); 792 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 793 794 switch (cmd_in) { 795 case SG_IO: 796 { 797 int blocking = 1; /* ignore O_NONBLOCK flag */ 798 799 if (sdp->detached) 800 return -ENODEV; 801 if (!scsi_block_when_processing_errors(sdp->device)) 802 return -ENXIO; 803 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 804 return -EFAULT; 805 result = 806 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, 807 blocking, read_only, &srp); 808 if (result < 0) 809 return result; 810 srp->sg_io_owned = 1; 811 while (1) { 812 result = 0; /* following macro to beat race condition */ 813 __wait_event_interruptible(sfp->read_wait, 814 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), 815 result); 816 if (sdp->detached) 817 return -ENODEV; 818 if (sfp->closed) 819 return 0; /* request packet dropped already */ 820 if (0 == result) 821 break; 822 srp->orphan = 1; 823 return result; /* -ERESTARTSYS because signal hit process */ 824 } 825 write_lock_irqsave(&sfp->rq_list_lock, iflags); 826 srp->done = 2; 827 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 828 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 829 return (result < 0) ? result : 0; 830 } 831 case SG_SET_TIMEOUT: 832 result = get_user(val, ip); 833 if (result) 834 return result; 835 if (val < 0) 836 return -EIO; 837 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 838 val = MULDIV (INT_MAX, USER_HZ, HZ); 839 sfp->timeout_user = val; 840 sfp->timeout = MULDIV (val, HZ, USER_HZ); 841 842 return 0; 843 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 844 /* strange ..., for backward compatibility */ 845 return sfp->timeout_user; 846 case SG_SET_FORCE_LOW_DMA: 847 result = get_user(val, ip); 848 if (result) 849 return result; 850 if (val) { 851 sfp->low_dma = 1; 852 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 853 val = (int) sfp->reserve.bufflen; 854 sg_remove_scat(&sfp->reserve); 855 sg_build_reserve(sfp, val); 856 } 857 } else { 858 if (sdp->detached) 859 return -ENODEV; 860 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 861 } 862 return 0; 863 case SG_GET_LOW_DMA: 864 return put_user((int) sfp->low_dma, ip); 865 case SG_GET_SCSI_ID: 866 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 867 return -EFAULT; 868 else { 869 sg_scsi_id_t __user *sg_idp = p; 870 871 if (sdp->detached) 872 return -ENODEV; 873 __put_user((int) sdp->device->host->host_no, 874 &sg_idp->host_no); 875 __put_user((int) sdp->device->channel, 876 &sg_idp->channel); 877 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 878 __put_user((int) sdp->device->lun, &sg_idp->lun); 879 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 880 __put_user((short) sdp->device->host->cmd_per_lun, 881 &sg_idp->h_cmd_per_lun); 882 __put_user((short) sdp->device->queue_depth, 883 &sg_idp->d_queue_depth); 884 __put_user(0, &sg_idp->unused[0]); 885 __put_user(0, &sg_idp->unused[1]); 886 return 0; 887 } 888 case SG_SET_FORCE_PACK_ID: 889 result = get_user(val, ip); 890 if (result) 891 return result; 892 sfp->force_packid = val ? 1 : 0; 893 return 0; 894 case SG_GET_PACK_ID: 895 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 896 return -EFAULT; 897 read_lock_irqsave(&sfp->rq_list_lock, iflags); 898 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 899 if ((1 == srp->done) && (!srp->sg_io_owned)) { 900 read_unlock_irqrestore(&sfp->rq_list_lock, 901 iflags); 902 __put_user(srp->header.pack_id, ip); 903 return 0; 904 } 905 } 906 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 907 __put_user(-1, ip); 908 return 0; 909 case SG_GET_NUM_WAITING: 910 read_lock_irqsave(&sfp->rq_list_lock, iflags); 911 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 912 if ((1 == srp->done) && (!srp->sg_io_owned)) 913 ++val; 914 } 915 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 916 return put_user(val, ip); 917 case SG_GET_SG_TABLESIZE: 918 return put_user(sdp->sg_tablesize, ip); 919 case SG_SET_RESERVED_SIZE: 920 result = get_user(val, ip); 921 if (result) 922 return result; 923 if (val < 0) 924 return -EINVAL; 925 val = min_t(int, val, 926 sdp->device->request_queue->max_sectors * 512); 927 if (val != sfp->reserve.bufflen) { 928 if (sg_res_in_use(sfp) || sfp->mmap_called) 929 return -EBUSY; 930 sg_remove_scat(&sfp->reserve); 931 sg_build_reserve(sfp, val); 932 } 933 return 0; 934 case SG_GET_RESERVED_SIZE: 935 val = min_t(int, sfp->reserve.bufflen, 936 sdp->device->request_queue->max_sectors * 512); 937 return put_user(val, ip); 938 case SG_SET_COMMAND_Q: 939 result = get_user(val, ip); 940 if (result) 941 return result; 942 sfp->cmd_q = val ? 1 : 0; 943 return 0; 944 case SG_GET_COMMAND_Q: 945 return put_user((int) sfp->cmd_q, ip); 946 case SG_SET_KEEP_ORPHAN: 947 result = get_user(val, ip); 948 if (result) 949 return result; 950 sfp->keep_orphan = val; 951 return 0; 952 case SG_GET_KEEP_ORPHAN: 953 return put_user((int) sfp->keep_orphan, ip); 954 case SG_NEXT_CMD_LEN: 955 result = get_user(val, ip); 956 if (result) 957 return result; 958 sfp->next_cmd_len = (val > 0) ? val : 0; 959 return 0; 960 case SG_GET_VERSION_NUM: 961 return put_user(sg_version_num, ip); 962 case SG_GET_ACCESS_COUNT: 963 /* faked - we don't have a real access count anymore */ 964 val = (sdp->device ? 1 : 0); 965 return put_user(val, ip); 966 case SG_GET_REQUEST_TABLE: 967 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 968 return -EFAULT; 969 else { 970 sg_req_info_t *rinfo; 971 unsigned int ms; 972 973 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 974 GFP_KERNEL); 975 if (!rinfo) 976 return -ENOMEM; 977 read_lock_irqsave(&sfp->rq_list_lock, iflags); 978 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 979 ++val, srp = srp ? srp->nextrp : srp) { 980 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 981 if (srp) { 982 rinfo[val].req_state = srp->done + 1; 983 rinfo[val].problem = 984 srp->header.masked_status & 985 srp->header.host_status & 986 srp->header.driver_status; 987 if (srp->done) 988 rinfo[val].duration = 989 srp->header.duration; 990 else { 991 ms = jiffies_to_msecs(jiffies); 992 rinfo[val].duration = 993 (ms > srp->header.duration) ? 994 (ms - srp->header.duration) : 0; 995 } 996 rinfo[val].orphan = srp->orphan; 997 rinfo[val].sg_io_owned = 998 srp->sg_io_owned; 999 rinfo[val].pack_id = 1000 srp->header.pack_id; 1001 rinfo[val].usr_ptr = 1002 srp->header.usr_ptr; 1003 } 1004 } 1005 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1006 result = __copy_to_user(p, rinfo, 1007 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 1008 result = result ? -EFAULT : 0; 1009 kfree(rinfo); 1010 return result; 1011 } 1012 case SG_EMULATED_HOST: 1013 if (sdp->detached) 1014 return -ENODEV; 1015 return put_user(sdp->device->host->hostt->emulated, ip); 1016 case SG_SCSI_RESET: 1017 if (sdp->detached) 1018 return -ENODEV; 1019 if (filp->f_flags & O_NONBLOCK) { 1020 if (scsi_host_in_recovery(sdp->device->host)) 1021 return -EBUSY; 1022 } else if (!scsi_block_when_processing_errors(sdp->device)) 1023 return -EBUSY; 1024 result = get_user(val, ip); 1025 if (result) 1026 return result; 1027 if (SG_SCSI_RESET_NOTHING == val) 1028 return 0; 1029 switch (val) { 1030 case SG_SCSI_RESET_DEVICE: 1031 val = SCSI_TRY_RESET_DEVICE; 1032 break; 1033 case SG_SCSI_RESET_TARGET: 1034 val = SCSI_TRY_RESET_TARGET; 1035 break; 1036 case SG_SCSI_RESET_BUS: 1037 val = SCSI_TRY_RESET_BUS; 1038 break; 1039 case SG_SCSI_RESET_HOST: 1040 val = SCSI_TRY_RESET_HOST; 1041 break; 1042 default: 1043 return -EINVAL; 1044 } 1045 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1046 return -EACCES; 1047 return (scsi_reset_provider(sdp->device, val) == 1048 SUCCESS) ? 0 : -EIO; 1049 case SCSI_IOCTL_SEND_COMMAND: 1050 if (sdp->detached) 1051 return -ENODEV; 1052 if (read_only) { 1053 unsigned char opcode = WRITE_6; 1054 Scsi_Ioctl_Command __user *siocp = p; 1055 1056 if (copy_from_user(&opcode, siocp->data, 1)) 1057 return -EFAULT; 1058 if (sg_allow_access(filp, &opcode)) 1059 return -EPERM; 1060 } 1061 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); 1062 case SG_SET_DEBUG: 1063 result = get_user(val, ip); 1064 if (result) 1065 return result; 1066 sdp->sgdebug = (char) val; 1067 return 0; 1068 case SCSI_IOCTL_GET_IDLUN: 1069 case SCSI_IOCTL_GET_BUS_NUMBER: 1070 case SCSI_IOCTL_PROBE_HOST: 1071 case SG_GET_TRANSFORM: 1072 if (sdp->detached) 1073 return -ENODEV; 1074 return scsi_ioctl(sdp->device, cmd_in, p); 1075 case BLKSECTGET: 1076 return put_user(sdp->device->request_queue->max_sectors * 512, 1077 ip); 1078 case BLKTRACESETUP: 1079 return blk_trace_setup(sdp->device->request_queue, 1080 sdp->disk->disk_name, 1081 sdp->device->sdev_gendev.devt, 1082 (char *)arg); 1083 case BLKTRACESTART: 1084 return blk_trace_startstop(sdp->device->request_queue, 1); 1085 case BLKTRACESTOP: 1086 return blk_trace_startstop(sdp->device->request_queue, 0); 1087 case BLKTRACETEARDOWN: 1088 return blk_trace_remove(sdp->device->request_queue); 1089 default: 1090 if (read_only) 1091 return -EPERM; /* don't know so take safe approach */ 1092 return scsi_ioctl(sdp->device, cmd_in, p); 1093 } 1094 } 1095 1096 #ifdef CONFIG_COMPAT 1097 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1098 { 1099 Sg_device *sdp; 1100 Sg_fd *sfp; 1101 struct scsi_device *sdev; 1102 1103 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1104 return -ENXIO; 1105 1106 sdev = sdp->device; 1107 if (sdev->host->hostt->compat_ioctl) { 1108 int ret; 1109 1110 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1111 1112 return ret; 1113 } 1114 1115 return -ENOIOCTLCMD; 1116 } 1117 #endif 1118 1119 static unsigned int 1120 sg_poll(struct file *filp, poll_table * wait) 1121 { 1122 unsigned int res = 0; 1123 Sg_device *sdp; 1124 Sg_fd *sfp; 1125 Sg_request *srp; 1126 int count = 0; 1127 unsigned long iflags; 1128 1129 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) 1130 || sfp->closed) 1131 return POLLERR; 1132 poll_wait(filp, &sfp->read_wait, wait); 1133 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1134 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1135 /* if any read waiting, flag it */ 1136 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1137 res = POLLIN | POLLRDNORM; 1138 ++count; 1139 } 1140 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1141 1142 if (sdp->detached) 1143 res |= POLLHUP; 1144 else if (!sfp->cmd_q) { 1145 if (0 == count) 1146 res |= POLLOUT | POLLWRNORM; 1147 } else if (count < SG_MAX_QUEUE) 1148 res |= POLLOUT | POLLWRNORM; 1149 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1150 sdp->disk->disk_name, (int) res)); 1151 return res; 1152 } 1153 1154 static int 1155 sg_fasync(int fd, struct file *filp, int mode) 1156 { 1157 int retval; 1158 Sg_device *sdp; 1159 Sg_fd *sfp; 1160 1161 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1162 return -ENXIO; 1163 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1164 sdp->disk->disk_name, mode)); 1165 1166 retval = fasync_helper(fd, filp, mode, &sfp->async_qp); 1167 return (retval < 0) ? retval : 0; 1168 } 1169 1170 static int 1171 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1172 { 1173 Sg_fd *sfp; 1174 unsigned long offset, len, sa; 1175 Sg_scatter_hold *rsv_schp; 1176 int k, length; 1177 1178 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1179 return VM_FAULT_SIGBUS; 1180 rsv_schp = &sfp->reserve; 1181 offset = vmf->pgoff << PAGE_SHIFT; 1182 if (offset >= rsv_schp->bufflen) 1183 return VM_FAULT_SIGBUS; 1184 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", 1185 offset, rsv_schp->k_use_sg)); 1186 sa = vma->vm_start; 1187 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1188 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1189 len = vma->vm_end - sa; 1190 len = (len < length) ? len : length; 1191 if (offset < len) { 1192 struct page *page = nth_page(rsv_schp->pages[k], 1193 offset >> PAGE_SHIFT); 1194 get_page(page); /* increment page count */ 1195 vmf->page = page; 1196 return 0; /* success */ 1197 } 1198 sa += len; 1199 offset -= len; 1200 } 1201 1202 return VM_FAULT_SIGBUS; 1203 } 1204 1205 static struct vm_operations_struct sg_mmap_vm_ops = { 1206 .fault = sg_vma_fault, 1207 }; 1208 1209 static int 1210 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1211 { 1212 Sg_fd *sfp; 1213 unsigned long req_sz, len, sa; 1214 Sg_scatter_hold *rsv_schp; 1215 int k, length; 1216 1217 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1218 return -ENXIO; 1219 req_sz = vma->vm_end - vma->vm_start; 1220 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1221 (void *) vma->vm_start, (int) req_sz)); 1222 if (vma->vm_pgoff) 1223 return -EINVAL; /* want no offset */ 1224 rsv_schp = &sfp->reserve; 1225 if (req_sz > rsv_schp->bufflen) 1226 return -ENOMEM; /* cannot map more than reserved buffer */ 1227 1228 sa = vma->vm_start; 1229 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1230 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1231 len = vma->vm_end - sa; 1232 len = (len < length) ? len : length; 1233 sa += len; 1234 } 1235 1236 sfp->mmap_called = 1; 1237 vma->vm_flags |= VM_RESERVED; 1238 vma->vm_private_data = sfp; 1239 vma->vm_ops = &sg_mmap_vm_ops; 1240 return 0; 1241 } 1242 1243 /* 1244 * This function is a "bottom half" handler that is called by the mid 1245 * level when a command is completed (or has failed). 1246 */ 1247 static void sg_rq_end_io(struct request *rq, int uptodate) 1248 { 1249 struct sg_request *srp = rq->end_io_data; 1250 Sg_device *sdp = NULL; 1251 Sg_fd *sfp; 1252 unsigned long iflags; 1253 unsigned int ms; 1254 char *sense; 1255 int result, resid; 1256 1257 if (NULL == srp) { 1258 printk(KERN_ERR "sg_cmd_done: NULL request\n"); 1259 return; 1260 } 1261 sfp = srp->parentfp; 1262 if (sfp) 1263 sdp = sfp->parentdp; 1264 if ((NULL == sdp) || sdp->detached) { 1265 printk(KERN_INFO "sg_cmd_done: device detached\n"); 1266 return; 1267 } 1268 1269 sense = rq->sense; 1270 result = rq->errors; 1271 resid = rq->data_len; 1272 1273 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1274 sdp->disk->disk_name, srp->header.pack_id, result)); 1275 srp->header.resid = resid; 1276 ms = jiffies_to_msecs(jiffies); 1277 srp->header.duration = (ms > srp->header.duration) ? 1278 (ms - srp->header.duration) : 0; 1279 if (0 != result) { 1280 struct scsi_sense_hdr sshdr; 1281 1282 srp->header.status = 0xff & result; 1283 srp->header.masked_status = status_byte(result); 1284 srp->header.msg_status = msg_byte(result); 1285 srp->header.host_status = host_byte(result); 1286 srp->header.driver_status = driver_byte(result); 1287 if ((sdp->sgdebug > 0) && 1288 ((CHECK_CONDITION == srp->header.masked_status) || 1289 (COMMAND_TERMINATED == srp->header.masked_status))) 1290 __scsi_print_sense("sg_cmd_done", sense, 1291 SCSI_SENSE_BUFFERSIZE); 1292 1293 /* Following if statement is a patch supplied by Eric Youngdale */ 1294 if (driver_byte(result) != 0 1295 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1296 && !scsi_sense_is_deferred(&sshdr) 1297 && sshdr.sense_key == UNIT_ATTENTION 1298 && sdp->device->removable) { 1299 /* Detected possible disc change. Set the bit - this */ 1300 /* may be used if there are filesystems using this device */ 1301 sdp->device->changed = 1; 1302 } 1303 } 1304 /* Rely on write phase to clean out srp status values, so no "else" */ 1305 1306 if (sfp->closed) { /* whoops this fd already released, cleanup */ 1307 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); 1308 sg_finish_rem_req(srp); 1309 srp = NULL; 1310 if (NULL == sfp->headrp) { 1311 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n")); 1312 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ 1313 scsi_device_put(sdp->device); 1314 } 1315 sfp = NULL; 1316 } 1317 } else if (srp && srp->orphan) { 1318 if (sfp->keep_orphan) 1319 srp->sg_io_owned = 0; 1320 else { 1321 sg_finish_rem_req(srp); 1322 srp = NULL; 1323 } 1324 } 1325 if (sfp && srp) { 1326 /* Now wake up any sg_read() that is waiting for this packet. */ 1327 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1328 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1329 srp->done = 1; 1330 wake_up_interruptible(&sfp->read_wait); 1331 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1332 } 1333 } 1334 1335 static struct file_operations sg_fops = { 1336 .owner = THIS_MODULE, 1337 .read = sg_read, 1338 .write = sg_write, 1339 .poll = sg_poll, 1340 .ioctl = sg_ioctl, 1341 #ifdef CONFIG_COMPAT 1342 .compat_ioctl = sg_compat_ioctl, 1343 #endif 1344 .open = sg_open, 1345 .mmap = sg_mmap, 1346 .release = sg_release, 1347 .fasync = sg_fasync, 1348 }; 1349 1350 static struct class *sg_sysfs_class; 1351 1352 static int sg_sysfs_valid = 0; 1353 1354 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1355 { 1356 struct request_queue *q = scsidp->request_queue; 1357 Sg_device *sdp; 1358 unsigned long iflags; 1359 int error; 1360 u32 k; 1361 1362 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1363 if (!sdp) { 1364 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1365 return ERR_PTR(-ENOMEM); 1366 } 1367 error = -ENOMEM; 1368 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) { 1369 printk(KERN_WARNING "idr expansion Sg_device failure\n"); 1370 goto out; 1371 } 1372 1373 write_lock_irqsave(&sg_index_lock, iflags); 1374 error = idr_get_new(&sg_index_idr, sdp, &k); 1375 write_unlock_irqrestore(&sg_index_lock, iflags); 1376 1377 if (error) { 1378 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n", 1379 error); 1380 goto out; 1381 } 1382 1383 if (unlikely(k >= SG_MAX_DEVS)) 1384 goto overflow; 1385 1386 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1387 sprintf(disk->disk_name, "sg%d", k); 1388 disk->first_minor = k; 1389 sdp->disk = disk; 1390 sdp->device = scsidp; 1391 init_waitqueue_head(&sdp->o_excl_wait); 1392 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments); 1393 sdp->index = k; 1394 1395 error = 0; 1396 out: 1397 if (error) { 1398 kfree(sdp); 1399 return ERR_PTR(error); 1400 } 1401 return sdp; 1402 1403 overflow: 1404 sdev_printk(KERN_WARNING, scsidp, 1405 "Unable to attach sg device type=%d, minor " 1406 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); 1407 error = -ENODEV; 1408 goto out; 1409 } 1410 1411 static int 1412 sg_add(struct device *cl_dev, struct class_interface *cl_intf) 1413 { 1414 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1415 struct gendisk *disk; 1416 Sg_device *sdp = NULL; 1417 struct cdev * cdev = NULL; 1418 int error; 1419 unsigned long iflags; 1420 1421 disk = alloc_disk(1); 1422 if (!disk) { 1423 printk(KERN_WARNING "alloc_disk failed\n"); 1424 return -ENOMEM; 1425 } 1426 disk->major = SCSI_GENERIC_MAJOR; 1427 1428 error = -ENOMEM; 1429 cdev = cdev_alloc(); 1430 if (!cdev) { 1431 printk(KERN_WARNING "cdev_alloc failed\n"); 1432 goto out; 1433 } 1434 cdev->owner = THIS_MODULE; 1435 cdev->ops = &sg_fops; 1436 1437 sdp = sg_alloc(disk, scsidp); 1438 if (IS_ERR(sdp)) { 1439 printk(KERN_WARNING "sg_alloc failed\n"); 1440 error = PTR_ERR(sdp); 1441 goto out; 1442 } 1443 1444 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); 1445 if (error) 1446 goto cdev_add_err; 1447 1448 sdp->cdev = cdev; 1449 if (sg_sysfs_valid) { 1450 struct device *sg_class_member; 1451 1452 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, 1453 MKDEV(SCSI_GENERIC_MAJOR, 1454 sdp->index), 1455 sdp, "%s", disk->disk_name); 1456 if (IS_ERR(sg_class_member)) { 1457 printk(KERN_ERR "sg_add: " 1458 "device_create failed\n"); 1459 error = PTR_ERR(sg_class_member); 1460 goto cdev_add_err; 1461 } 1462 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1463 &sg_class_member->kobj, "generic"); 1464 if (error) 1465 printk(KERN_ERR "sg_add: unable to make symlink " 1466 "'generic' back to sg%d\n", sdp->index); 1467 } else 1468 printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); 1469 1470 sdev_printk(KERN_NOTICE, scsidp, 1471 "Attached scsi generic sg%d type %d\n", sdp->index, 1472 scsidp->type); 1473 1474 dev_set_drvdata(cl_dev, sdp); 1475 1476 return 0; 1477 1478 cdev_add_err: 1479 write_lock_irqsave(&sg_index_lock, iflags); 1480 idr_remove(&sg_index_idr, sdp->index); 1481 write_unlock_irqrestore(&sg_index_lock, iflags); 1482 kfree(sdp); 1483 1484 out: 1485 put_disk(disk); 1486 if (cdev) 1487 cdev_del(cdev); 1488 return error; 1489 } 1490 1491 static void 1492 sg_remove(struct device *cl_dev, struct class_interface *cl_intf) 1493 { 1494 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1495 Sg_device *sdp = dev_get_drvdata(cl_dev); 1496 unsigned long iflags; 1497 Sg_fd *sfp; 1498 Sg_fd *tsfp; 1499 Sg_request *srp; 1500 Sg_request *tsrp; 1501 int delay; 1502 1503 if (!sdp) 1504 return; 1505 1506 delay = 0; 1507 write_lock_irqsave(&sg_index_lock, iflags); 1508 if (sdp->headfp) { 1509 sdp->detached = 1; 1510 for (sfp = sdp->headfp; sfp; sfp = tsfp) { 1511 tsfp = sfp->nextfp; 1512 for (srp = sfp->headrp; srp; srp = tsrp) { 1513 tsrp = srp->nextrp; 1514 if (sfp->closed || (0 == sg_srp_done(srp, sfp))) 1515 sg_finish_rem_req(srp); 1516 } 1517 if (sfp->closed) { 1518 scsi_device_put(sdp->device); 1519 __sg_remove_sfp(sdp, sfp); 1520 } else { 1521 delay = 1; 1522 wake_up_interruptible(&sfp->read_wait); 1523 kill_fasync(&sfp->async_qp, SIGPOLL, 1524 POLL_HUP); 1525 } 1526 } 1527 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index)); 1528 if (NULL == sdp->headfp) { 1529 idr_remove(&sg_index_idr, sdp->index); 1530 } 1531 } else { /* nothing active, simple case */ 1532 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index)); 1533 idr_remove(&sg_index_idr, sdp->index); 1534 } 1535 write_unlock_irqrestore(&sg_index_lock, iflags); 1536 1537 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1538 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); 1539 cdev_del(sdp->cdev); 1540 sdp->cdev = NULL; 1541 put_disk(sdp->disk); 1542 sdp->disk = NULL; 1543 if (NULL == sdp->headfp) 1544 kfree(sdp); 1545 1546 if (delay) 1547 msleep(10); /* dirty detach so delay device destruction */ 1548 } 1549 1550 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1551 module_param_named(def_reserved_size, def_reserved_size, int, 1552 S_IRUGO | S_IWUSR); 1553 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1554 1555 MODULE_AUTHOR("Douglas Gilbert"); 1556 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1557 MODULE_LICENSE("GPL"); 1558 MODULE_VERSION(SG_VERSION_STR); 1559 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1560 1561 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1562 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1563 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1564 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1565 1566 static int __init 1567 init_sg(void) 1568 { 1569 int rc; 1570 1571 if (scatter_elem_sz < PAGE_SIZE) { 1572 scatter_elem_sz = PAGE_SIZE; 1573 scatter_elem_sz_prev = scatter_elem_sz; 1574 } 1575 if (def_reserved_size >= 0) 1576 sg_big_buff = def_reserved_size; 1577 else 1578 def_reserved_size = sg_big_buff; 1579 1580 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1581 SG_MAX_DEVS, "sg"); 1582 if (rc) 1583 return rc; 1584 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1585 if ( IS_ERR(sg_sysfs_class) ) { 1586 rc = PTR_ERR(sg_sysfs_class); 1587 goto err_out; 1588 } 1589 sg_sysfs_valid = 1; 1590 rc = scsi_register_interface(&sg_interface); 1591 if (0 == rc) { 1592 #ifdef CONFIG_SCSI_PROC_FS 1593 sg_proc_init(); 1594 #endif /* CONFIG_SCSI_PROC_FS */ 1595 return 0; 1596 } 1597 class_destroy(sg_sysfs_class); 1598 err_out: 1599 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1600 return rc; 1601 } 1602 1603 static void __exit 1604 exit_sg(void) 1605 { 1606 #ifdef CONFIG_SCSI_PROC_FS 1607 sg_proc_cleanup(); 1608 #endif /* CONFIG_SCSI_PROC_FS */ 1609 scsi_unregister_interface(&sg_interface); 1610 class_destroy(sg_sysfs_class); 1611 sg_sysfs_valid = 0; 1612 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1613 SG_MAX_DEVS); 1614 idr_destroy(&sg_index_idr); 1615 } 1616 1617 static int sg_start_req(Sg_request *srp, unsigned char *cmd) 1618 { 1619 int res; 1620 struct request *rq; 1621 Sg_fd *sfp = srp->parentfp; 1622 sg_io_hdr_t *hp = &srp->header; 1623 int dxfer_len = (int) hp->dxfer_len; 1624 int dxfer_dir = hp->dxfer_direction; 1625 unsigned int iov_count = hp->iovec_count; 1626 Sg_scatter_hold *req_schp = &srp->data; 1627 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1628 struct request_queue *q = sfp->parentdp->device->request_queue; 1629 struct rq_map_data *md, map_data; 1630 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; 1631 1632 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n", 1633 dxfer_len)); 1634 1635 rq = blk_get_request(q, rw, GFP_ATOMIC); 1636 if (!rq) 1637 return -ENOMEM; 1638 1639 memcpy(rq->cmd, cmd, hp->cmd_len); 1640 1641 rq->cmd_len = hp->cmd_len; 1642 rq->cmd_type = REQ_TYPE_BLOCK_PC; 1643 1644 srp->rq = rq; 1645 rq->end_io_data = srp; 1646 rq->sense = srp->sense_b; 1647 rq->retries = SG_DEFAULT_RETRIES; 1648 1649 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1650 return 0; 1651 1652 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && 1653 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && 1654 !sfp->parentdp->device->host->unchecked_isa_dma && 1655 blk_rq_aligned(q, hp->dxferp, dxfer_len)) 1656 md = NULL; 1657 else 1658 md = &map_data; 1659 1660 if (md) { 1661 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) 1662 sg_link_reserve(sfp, srp, dxfer_len); 1663 else { 1664 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1665 if (res) 1666 return res; 1667 } 1668 1669 md->pages = req_schp->pages; 1670 md->page_order = req_schp->page_order; 1671 md->nr_entries = req_schp->k_use_sg; 1672 } 1673 1674 if (iov_count) 1675 res = blk_rq_map_user_iov(q, rq, md, hp->dxferp, iov_count, 1676 hp->dxfer_len, GFP_ATOMIC); 1677 else 1678 res = blk_rq_map_user(q, rq, md, hp->dxferp, 1679 hp->dxfer_len, GFP_ATOMIC); 1680 1681 if (!res) { 1682 srp->bio = rq->bio; 1683 1684 if (!md) { 1685 req_schp->dio_in_use = 1; 1686 hp->info |= SG_INFO_DIRECT_IO; 1687 } 1688 } 1689 return res; 1690 } 1691 1692 static void 1693 sg_finish_rem_req(Sg_request * srp) 1694 { 1695 Sg_fd *sfp = srp->parentfp; 1696 Sg_scatter_hold *req_schp = &srp->data; 1697 1698 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1699 if (srp->res_used) 1700 sg_unlink_reserve(sfp, srp); 1701 else 1702 sg_remove_scat(req_schp); 1703 1704 if (srp->rq) { 1705 if (srp->bio) 1706 blk_rq_unmap_user(srp->bio); 1707 1708 blk_put_request(srp->rq); 1709 } 1710 1711 sg_remove_request(sfp, srp); 1712 } 1713 1714 static int 1715 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1716 { 1717 int sg_bufflen = tablesize * sizeof(struct page *); 1718 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1719 1720 schp->pages = kzalloc(sg_bufflen, gfp_flags); 1721 if (!schp->pages) 1722 return -ENOMEM; 1723 schp->sglist_len = sg_bufflen; 1724 return tablesize; /* number of scat_gath elements allocated */ 1725 } 1726 1727 static int 1728 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1729 { 1730 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; 1731 int sg_tablesize = sfp->parentdp->sg_tablesize; 1732 int blk_size = buff_size, order; 1733 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 1734 1735 if (blk_size < 0) 1736 return -EFAULT; 1737 if (0 == blk_size) 1738 ++blk_size; /* don't know why */ 1739 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1740 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); 1741 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1742 buff_size, blk_size)); 1743 1744 /* N.B. ret_sz carried into this block ... */ 1745 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1746 if (mx_sc_elems < 0) 1747 return mx_sc_elems; /* most likely -ENOMEM */ 1748 1749 num = scatter_elem_sz; 1750 if (unlikely(num != scatter_elem_sz_prev)) { 1751 if (num < PAGE_SIZE) { 1752 scatter_elem_sz = PAGE_SIZE; 1753 scatter_elem_sz_prev = PAGE_SIZE; 1754 } else 1755 scatter_elem_sz_prev = num; 1756 } 1757 1758 if (sfp->low_dma) 1759 gfp_mask |= GFP_DMA; 1760 1761 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1762 gfp_mask |= __GFP_ZERO; 1763 1764 order = get_order(num); 1765 retry: 1766 ret_sz = 1 << (PAGE_SHIFT + order); 1767 1768 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; 1769 k++, rem_sz -= ret_sz) { 1770 1771 num = (rem_sz > scatter_elem_sz_prev) ? 1772 scatter_elem_sz_prev : rem_sz; 1773 1774 schp->pages[k] = alloc_pages(gfp_mask, order); 1775 if (!schp->pages[k]) 1776 goto out; 1777 1778 if (num == scatter_elem_sz_prev) { 1779 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1780 scatter_elem_sz = ret_sz; 1781 scatter_elem_sz_prev = ret_sz; 1782 } 1783 } 1784 1785 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " 1786 "ret_sz=%d\n", k, num, ret_sz)); 1787 } /* end of for loop */ 1788 1789 schp->page_order = order; 1790 schp->k_use_sg = k; 1791 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " 1792 "rem_sz=%d\n", k, rem_sz)); 1793 1794 schp->bufflen = blk_size; 1795 if (rem_sz > 0) /* must have failed */ 1796 return -ENOMEM; 1797 return 0; 1798 out: 1799 for (i = 0; i < k; i++) 1800 __free_pages(schp->pages[k], order); 1801 1802 if (--order >= 0) 1803 goto retry; 1804 1805 return -ENOMEM; 1806 } 1807 1808 static void 1809 sg_remove_scat(Sg_scatter_hold * schp) 1810 { 1811 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1812 if (schp->pages && schp->sglist_len > 0) { 1813 if (!schp->dio_in_use) { 1814 int k; 1815 1816 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1817 SCSI_LOG_TIMEOUT(5, printk( 1818 "sg_remove_scat: k=%d, pg=0x%p\n", 1819 k, schp->pages[k])); 1820 __free_pages(schp->pages[k], schp->page_order); 1821 } 1822 1823 kfree(schp->pages); 1824 } 1825 } 1826 memset(schp, 0, sizeof (*schp)); 1827 } 1828 1829 static int 1830 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 1831 { 1832 Sg_scatter_hold *schp = &srp->data; 1833 int k, num; 1834 1835 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 1836 num_read_xfer)); 1837 if ((!outp) || (num_read_xfer <= 0)) 1838 return 0; 1839 1840 num = 1 << (PAGE_SHIFT + schp->page_order); 1841 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1842 if (num > num_read_xfer) { 1843 if (__copy_to_user(outp, page_address(schp->pages[k]), 1844 num_read_xfer)) 1845 return -EFAULT; 1846 break; 1847 } else { 1848 if (__copy_to_user(outp, page_address(schp->pages[k]), 1849 num)) 1850 return -EFAULT; 1851 num_read_xfer -= num; 1852 if (num_read_xfer <= 0) 1853 break; 1854 outp += num; 1855 } 1856 } 1857 1858 return 0; 1859 } 1860 1861 static void 1862 sg_build_reserve(Sg_fd * sfp, int req_size) 1863 { 1864 Sg_scatter_hold *schp = &sfp->reserve; 1865 1866 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 1867 do { 1868 if (req_size < PAGE_SIZE) 1869 req_size = PAGE_SIZE; 1870 if (0 == sg_build_indirect(schp, sfp, req_size)) 1871 return; 1872 else 1873 sg_remove_scat(schp); 1874 req_size >>= 1; /* divide by 2 */ 1875 } while (req_size > (PAGE_SIZE / 2)); 1876 } 1877 1878 static void 1879 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 1880 { 1881 Sg_scatter_hold *req_schp = &srp->data; 1882 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1883 int k, num, rem; 1884 1885 srp->res_used = 1; 1886 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 1887 rem = size; 1888 1889 num = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1890 for (k = 0; k < rsv_schp->k_use_sg; k++) { 1891 if (rem <= num) { 1892 req_schp->k_use_sg = k + 1; 1893 req_schp->sglist_len = rsv_schp->sglist_len; 1894 req_schp->pages = rsv_schp->pages; 1895 1896 req_schp->bufflen = size; 1897 req_schp->page_order = rsv_schp->page_order; 1898 break; 1899 } else 1900 rem -= num; 1901 } 1902 1903 if (k >= rsv_schp->k_use_sg) 1904 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 1905 } 1906 1907 static void 1908 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 1909 { 1910 Sg_scatter_hold *req_schp = &srp->data; 1911 1912 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 1913 (int) req_schp->k_use_sg)); 1914 req_schp->k_use_sg = 0; 1915 req_schp->bufflen = 0; 1916 req_schp->pages = NULL; 1917 req_schp->page_order = 0; 1918 req_schp->sglist_len = 0; 1919 sfp->save_scat_len = 0; 1920 srp->res_used = 0; 1921 } 1922 1923 static Sg_request * 1924 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 1925 { 1926 Sg_request *resp; 1927 unsigned long iflags; 1928 1929 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1930 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 1931 /* look for requests that are ready + not SG_IO owned */ 1932 if ((1 == resp->done) && (!resp->sg_io_owned) && 1933 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 1934 resp->done = 2; /* guard against other readers */ 1935 break; 1936 } 1937 } 1938 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1939 return resp; 1940 } 1941 1942 #ifdef CONFIG_SCSI_PROC_FS 1943 static Sg_request * 1944 sg_get_nth_request(Sg_fd * sfp, int nth) 1945 { 1946 Sg_request *resp; 1947 unsigned long iflags; 1948 int k; 1949 1950 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1951 for (k = 0, resp = sfp->headrp; resp && (k < nth); 1952 ++k, resp = resp->nextrp) ; 1953 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1954 return resp; 1955 } 1956 #endif 1957 1958 /* always adds to end of list */ 1959 static Sg_request * 1960 sg_add_request(Sg_fd * sfp) 1961 { 1962 int k; 1963 unsigned long iflags; 1964 Sg_request *resp; 1965 Sg_request *rp = sfp->req_arr; 1966 1967 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1968 resp = sfp->headrp; 1969 if (!resp) { 1970 memset(rp, 0, sizeof (Sg_request)); 1971 rp->parentfp = sfp; 1972 resp = rp; 1973 sfp->headrp = resp; 1974 } else { 1975 if (0 == sfp->cmd_q) 1976 resp = NULL; /* command queuing disallowed */ 1977 else { 1978 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 1979 if (!rp->parentfp) 1980 break; 1981 } 1982 if (k < SG_MAX_QUEUE) { 1983 memset(rp, 0, sizeof (Sg_request)); 1984 rp->parentfp = sfp; 1985 while (resp->nextrp) 1986 resp = resp->nextrp; 1987 resp->nextrp = rp; 1988 resp = rp; 1989 } else 1990 resp = NULL; 1991 } 1992 } 1993 if (resp) { 1994 resp->nextrp = NULL; 1995 resp->header.duration = jiffies_to_msecs(jiffies); 1996 } 1997 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1998 return resp; 1999 } 2000 2001 /* Return of 1 for found; 0 for not found */ 2002 static int 2003 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2004 { 2005 Sg_request *prev_rp; 2006 Sg_request *rp; 2007 unsigned long iflags; 2008 int res = 0; 2009 2010 if ((!sfp) || (!srp) || (!sfp->headrp)) 2011 return res; 2012 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2013 prev_rp = sfp->headrp; 2014 if (srp == prev_rp) { 2015 sfp->headrp = prev_rp->nextrp; 2016 prev_rp->parentfp = NULL; 2017 res = 1; 2018 } else { 2019 while ((rp = prev_rp->nextrp)) { 2020 if (srp == rp) { 2021 prev_rp->nextrp = rp->nextrp; 2022 rp->parentfp = NULL; 2023 res = 1; 2024 break; 2025 } 2026 prev_rp = rp; 2027 } 2028 } 2029 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2030 return res; 2031 } 2032 2033 #ifdef CONFIG_SCSI_PROC_FS 2034 static Sg_fd * 2035 sg_get_nth_sfp(Sg_device * sdp, int nth) 2036 { 2037 Sg_fd *resp; 2038 unsigned long iflags; 2039 int k; 2040 2041 read_lock_irqsave(&sg_index_lock, iflags); 2042 for (k = 0, resp = sdp->headfp; resp && (k < nth); 2043 ++k, resp = resp->nextfp) ; 2044 read_unlock_irqrestore(&sg_index_lock, iflags); 2045 return resp; 2046 } 2047 #endif 2048 2049 static Sg_fd * 2050 sg_add_sfp(Sg_device * sdp, int dev) 2051 { 2052 Sg_fd *sfp; 2053 unsigned long iflags; 2054 int bufflen; 2055 2056 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2057 if (!sfp) 2058 return NULL; 2059 2060 init_waitqueue_head(&sfp->read_wait); 2061 rwlock_init(&sfp->rq_list_lock); 2062 2063 sfp->timeout = SG_DEFAULT_TIMEOUT; 2064 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2065 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2066 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2067 sdp->device->host->unchecked_isa_dma : 1; 2068 sfp->cmd_q = SG_DEF_COMMAND_Q; 2069 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2070 sfp->parentdp = sdp; 2071 write_lock_irqsave(&sg_index_lock, iflags); 2072 if (!sdp->headfp) 2073 sdp->headfp = sfp; 2074 else { /* add to tail of existing list */ 2075 Sg_fd *pfp = sdp->headfp; 2076 while (pfp->nextfp) 2077 pfp = pfp->nextfp; 2078 pfp->nextfp = sfp; 2079 } 2080 write_unlock_irqrestore(&sg_index_lock, iflags); 2081 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2082 if (unlikely(sg_big_buff != def_reserved_size)) 2083 sg_big_buff = def_reserved_size; 2084 2085 bufflen = min_t(int, sg_big_buff, 2086 sdp->device->request_queue->max_sectors * 512); 2087 sg_build_reserve(sfp, bufflen); 2088 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2089 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2090 return sfp; 2091 } 2092 2093 static void 2094 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2095 { 2096 Sg_fd *fp; 2097 Sg_fd *prev_fp; 2098 2099 prev_fp = sdp->headfp; 2100 if (sfp == prev_fp) 2101 sdp->headfp = prev_fp->nextfp; 2102 else { 2103 while ((fp = prev_fp->nextfp)) { 2104 if (sfp == fp) { 2105 prev_fp->nextfp = fp->nextfp; 2106 break; 2107 } 2108 prev_fp = fp; 2109 } 2110 } 2111 if (sfp->reserve.bufflen > 0) { 2112 SCSI_LOG_TIMEOUT(6, 2113 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2114 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); 2115 sg_remove_scat(&sfp->reserve); 2116 } 2117 sfp->parentdp = NULL; 2118 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); 2119 kfree(sfp); 2120 } 2121 2122 /* Returns 0 in normal case, 1 when detached and sdp object removed */ 2123 static int 2124 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2125 { 2126 Sg_request *srp; 2127 Sg_request *tsrp; 2128 int dirty = 0; 2129 int res = 0; 2130 2131 for (srp = sfp->headrp; srp; srp = tsrp) { 2132 tsrp = srp->nextrp; 2133 if (sg_srp_done(srp, sfp)) 2134 sg_finish_rem_req(srp); 2135 else 2136 ++dirty; 2137 } 2138 if (0 == dirty) { 2139 unsigned long iflags; 2140 2141 write_lock_irqsave(&sg_index_lock, iflags); 2142 __sg_remove_sfp(sdp, sfp); 2143 if (sdp->detached && (NULL == sdp->headfp)) { 2144 idr_remove(&sg_index_idr, sdp->index); 2145 kfree(sdp); 2146 res = 1; 2147 } 2148 write_unlock_irqrestore(&sg_index_lock, iflags); 2149 } else { 2150 /* MOD_INC's to inhibit unloading sg and associated adapter driver */ 2151 /* only bump the access_count if we actually succeeded in 2152 * throwing another counter on the host module */ 2153 scsi_device_get(sdp->device); /* XXX: retval ignored? */ 2154 sfp->closed = 1; /* flag dirty state on this fd */ 2155 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", 2156 dirty)); 2157 } 2158 return res; 2159 } 2160 2161 static int 2162 sg_res_in_use(Sg_fd * sfp) 2163 { 2164 const Sg_request *srp; 2165 unsigned long iflags; 2166 2167 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2168 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2169 if (srp->res_used) 2170 break; 2171 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2172 return srp ? 1 : 0; 2173 } 2174 2175 #ifdef CONFIG_SCSI_PROC_FS 2176 static int 2177 sg_idr_max_id(int id, void *p, void *data) 2178 { 2179 int *k = data; 2180 2181 if (*k < id) 2182 *k = id; 2183 2184 return 0; 2185 } 2186 2187 static int 2188 sg_last_dev(void) 2189 { 2190 int k = -1; 2191 unsigned long iflags; 2192 2193 read_lock_irqsave(&sg_index_lock, iflags); 2194 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2195 read_unlock_irqrestore(&sg_index_lock, iflags); 2196 return k + 1; /* origin 1 */ 2197 } 2198 #endif 2199 2200 static Sg_device * 2201 sg_get_dev(int dev) 2202 { 2203 Sg_device *sdp; 2204 unsigned long iflags; 2205 2206 read_lock_irqsave(&sg_index_lock, iflags); 2207 sdp = idr_find(&sg_index_idr, dev); 2208 read_unlock_irqrestore(&sg_index_lock, iflags); 2209 2210 return sdp; 2211 } 2212 2213 #ifdef CONFIG_SCSI_PROC_FS 2214 2215 static struct proc_dir_entry *sg_proc_sgp = NULL; 2216 2217 static char sg_proc_sg_dirname[] = "scsi/sg"; 2218 2219 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2220 2221 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2222 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2223 size_t count, loff_t *off); 2224 static struct file_operations adio_fops = { 2225 /* .owner, .read and .llseek added in sg_proc_init() */ 2226 .open = sg_proc_single_open_adio, 2227 .write = sg_proc_write_adio, 2228 .release = single_release, 2229 }; 2230 2231 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2232 static ssize_t sg_proc_write_dressz(struct file *filp, 2233 const char __user *buffer, size_t count, loff_t *off); 2234 static struct file_operations dressz_fops = { 2235 .open = sg_proc_single_open_dressz, 2236 .write = sg_proc_write_dressz, 2237 .release = single_release, 2238 }; 2239 2240 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2241 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2242 static struct file_operations version_fops = { 2243 .open = sg_proc_single_open_version, 2244 .release = single_release, 2245 }; 2246 2247 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2248 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2249 static struct file_operations devhdr_fops = { 2250 .open = sg_proc_single_open_devhdr, 2251 .release = single_release, 2252 }; 2253 2254 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2255 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2256 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2257 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2258 static void dev_seq_stop(struct seq_file *s, void *v); 2259 static struct file_operations dev_fops = { 2260 .open = sg_proc_open_dev, 2261 .release = seq_release, 2262 }; 2263 static struct seq_operations dev_seq_ops = { 2264 .start = dev_seq_start, 2265 .next = dev_seq_next, 2266 .stop = dev_seq_stop, 2267 .show = sg_proc_seq_show_dev, 2268 }; 2269 2270 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2271 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2272 static struct file_operations devstrs_fops = { 2273 .open = sg_proc_open_devstrs, 2274 .release = seq_release, 2275 }; 2276 static struct seq_operations devstrs_seq_ops = { 2277 .start = dev_seq_start, 2278 .next = dev_seq_next, 2279 .stop = dev_seq_stop, 2280 .show = sg_proc_seq_show_devstrs, 2281 }; 2282 2283 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2284 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2285 static struct file_operations debug_fops = { 2286 .open = sg_proc_open_debug, 2287 .release = seq_release, 2288 }; 2289 static struct seq_operations debug_seq_ops = { 2290 .start = dev_seq_start, 2291 .next = dev_seq_next, 2292 .stop = dev_seq_stop, 2293 .show = sg_proc_seq_show_debug, 2294 }; 2295 2296 2297 struct sg_proc_leaf { 2298 const char * name; 2299 struct file_operations * fops; 2300 }; 2301 2302 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2303 {"allow_dio", &adio_fops}, 2304 {"debug", &debug_fops}, 2305 {"def_reserved_size", &dressz_fops}, 2306 {"device_hdr", &devhdr_fops}, 2307 {"devices", &dev_fops}, 2308 {"device_strs", &devstrs_fops}, 2309 {"version", &version_fops} 2310 }; 2311 2312 static int 2313 sg_proc_init(void) 2314 { 2315 int k, mask; 2316 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2317 struct sg_proc_leaf * leaf; 2318 2319 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2320 if (!sg_proc_sgp) 2321 return 1; 2322 for (k = 0; k < num_leaves; ++k) { 2323 leaf = &sg_proc_leaf_arr[k]; 2324 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2325 leaf->fops->owner = THIS_MODULE; 2326 leaf->fops->read = seq_read; 2327 leaf->fops->llseek = seq_lseek; 2328 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); 2329 } 2330 return 0; 2331 } 2332 2333 static void 2334 sg_proc_cleanup(void) 2335 { 2336 int k; 2337 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2338 2339 if (!sg_proc_sgp) 2340 return; 2341 for (k = 0; k < num_leaves; ++k) 2342 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2343 remove_proc_entry(sg_proc_sg_dirname, NULL); 2344 } 2345 2346 2347 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2348 { 2349 seq_printf(s, "%d\n", *((int *)s->private)); 2350 return 0; 2351 } 2352 2353 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2354 { 2355 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2356 } 2357 2358 static ssize_t 2359 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2360 size_t count, loff_t *off) 2361 { 2362 int num; 2363 char buff[11]; 2364 2365 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2366 return -EACCES; 2367 num = (count < 10) ? count : 10; 2368 if (copy_from_user(buff, buffer, num)) 2369 return -EFAULT; 2370 buff[num] = '\0'; 2371 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2372 return count; 2373 } 2374 2375 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2376 { 2377 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2378 } 2379 2380 static ssize_t 2381 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2382 size_t count, loff_t *off) 2383 { 2384 int num; 2385 unsigned long k = ULONG_MAX; 2386 char buff[11]; 2387 2388 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2389 return -EACCES; 2390 num = (count < 10) ? count : 10; 2391 if (copy_from_user(buff, buffer, num)) 2392 return -EFAULT; 2393 buff[num] = '\0'; 2394 k = simple_strtoul(buff, NULL, 10); 2395 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2396 sg_big_buff = k; 2397 return count; 2398 } 2399 return -ERANGE; 2400 } 2401 2402 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2403 { 2404 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2405 sg_version_date); 2406 return 0; 2407 } 2408 2409 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2410 { 2411 return single_open(file, sg_proc_seq_show_version, NULL); 2412 } 2413 2414 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2415 { 2416 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2417 "online\n"); 2418 return 0; 2419 } 2420 2421 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2422 { 2423 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2424 } 2425 2426 struct sg_proc_deviter { 2427 loff_t index; 2428 size_t max; 2429 }; 2430 2431 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2432 { 2433 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2434 2435 s->private = it; 2436 if (! it) 2437 return NULL; 2438 2439 it->index = *pos; 2440 it->max = sg_last_dev(); 2441 if (it->index >= it->max) 2442 return NULL; 2443 return it; 2444 } 2445 2446 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2447 { 2448 struct sg_proc_deviter * it = s->private; 2449 2450 *pos = ++it->index; 2451 return (it->index < it->max) ? it : NULL; 2452 } 2453 2454 static void dev_seq_stop(struct seq_file *s, void *v) 2455 { 2456 kfree(s->private); 2457 } 2458 2459 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2460 { 2461 return seq_open(file, &dev_seq_ops); 2462 } 2463 2464 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2465 { 2466 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2467 Sg_device *sdp; 2468 struct scsi_device *scsidp; 2469 2470 sdp = it ? sg_get_dev(it->index) : NULL; 2471 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2472 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2473 scsidp->host->host_no, scsidp->channel, 2474 scsidp->id, scsidp->lun, (int) scsidp->type, 2475 1, 2476 (int) scsidp->queue_depth, 2477 (int) scsidp->device_busy, 2478 (int) scsi_device_online(scsidp)); 2479 else 2480 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2481 return 0; 2482 } 2483 2484 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2485 { 2486 return seq_open(file, &devstrs_seq_ops); 2487 } 2488 2489 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2490 { 2491 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2492 Sg_device *sdp; 2493 struct scsi_device *scsidp; 2494 2495 sdp = it ? sg_get_dev(it->index) : NULL; 2496 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2497 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2498 scsidp->vendor, scsidp->model, scsidp->rev); 2499 else 2500 seq_printf(s, "<no active device>\n"); 2501 return 0; 2502 } 2503 2504 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2505 { 2506 int k, m, new_interface, blen, usg; 2507 Sg_request *srp; 2508 Sg_fd *fp; 2509 const sg_io_hdr_t *hp; 2510 const char * cp; 2511 unsigned int ms; 2512 2513 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { 2514 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2515 "(res)sgat=%d low_dma=%d\n", k + 1, 2516 jiffies_to_msecs(fp->timeout), 2517 fp->reserve.bufflen, 2518 (int) fp->reserve.k_use_sg, 2519 (int) fp->low_dma); 2520 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2521 (int) fp->cmd_q, (int) fp->force_packid, 2522 (int) fp->keep_orphan, (int) fp->closed); 2523 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { 2524 hp = &srp->header; 2525 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2526 if (srp->res_used) { 2527 if (new_interface && 2528 (SG_FLAG_MMAP_IO & hp->flags)) 2529 cp = " mmap>> "; 2530 else 2531 cp = " rb>> "; 2532 } else { 2533 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2534 cp = " dio>> "; 2535 else 2536 cp = " "; 2537 } 2538 seq_printf(s, cp); 2539 blen = srp->data.bufflen; 2540 usg = srp->data.k_use_sg; 2541 seq_printf(s, srp->done ? 2542 ((1 == srp->done) ? "rcv:" : "fin:") 2543 : "act:"); 2544 seq_printf(s, " id=%d blen=%d", 2545 srp->header.pack_id, blen); 2546 if (srp->done) 2547 seq_printf(s, " dur=%d", hp->duration); 2548 else { 2549 ms = jiffies_to_msecs(jiffies); 2550 seq_printf(s, " t_o/elap=%d/%d", 2551 (new_interface ? hp->timeout : 2552 jiffies_to_msecs(fp->timeout)), 2553 (ms > hp->duration ? ms - hp->duration : 0)); 2554 } 2555 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2556 (int) srp->data.cmd_opcode); 2557 } 2558 if (0 == m) 2559 seq_printf(s, " No requests active\n"); 2560 } 2561 } 2562 2563 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2564 { 2565 return seq_open(file, &debug_seq_ops); 2566 } 2567 2568 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2569 { 2570 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2571 Sg_device *sdp; 2572 2573 if (it && (0 == it->index)) { 2574 seq_printf(s, "max_active_device=%d(origin 1)\n", 2575 (int)it->max); 2576 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2577 } 2578 sdp = it ? sg_get_dev(it->index) : NULL; 2579 if (sdp) { 2580 struct scsi_device *scsidp = sdp->device; 2581 2582 if (NULL == scsidp) { 2583 seq_printf(s, "device %d detached ??\n", 2584 (int)it->index); 2585 return 0; 2586 } 2587 2588 if (sg_get_nth_sfp(sdp, 0)) { 2589 seq_printf(s, " >>> device=%s ", 2590 sdp->disk->disk_name); 2591 if (sdp->detached) 2592 seq_printf(s, "detached pending close "); 2593 else 2594 seq_printf 2595 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2596 scsidp->host->host_no, 2597 scsidp->channel, scsidp->id, 2598 scsidp->lun, 2599 scsidp->host->hostt->emulated); 2600 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2601 sdp->sg_tablesize, sdp->exclude); 2602 } 2603 sg_proc_debug_helper(s, sdp); 2604 } 2605 return 0; 2606 } 2607 2608 #endif /* CONFIG_SCSI_PROC_FS */ 2609 2610 module_init(init_sg); 2611 module_exit(exit_sg); 2612