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