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