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(queue_max_hw_segments(q), 293 queue_max_phys_segments(q)); 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 queue_max_sectors(sdp->device->request_queue) * 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 queue_max_sectors(sdp->device->request_queue) * 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(queue_max_sectors(sdp->device->request_queue) * 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 NULL, 1069 (char *)arg); 1070 case BLKTRACESTART: 1071 return blk_trace_startstop(sdp->device->request_queue, 1); 1072 case BLKTRACESTOP: 1073 return blk_trace_startstop(sdp->device->request_queue, 0); 1074 case BLKTRACETEARDOWN: 1075 return blk_trace_remove(sdp->device->request_queue); 1076 default: 1077 if (read_only) 1078 return -EPERM; /* don't know so take safe approach */ 1079 return scsi_ioctl(sdp->device, cmd_in, p); 1080 } 1081 } 1082 1083 #ifdef CONFIG_COMPAT 1084 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1085 { 1086 Sg_device *sdp; 1087 Sg_fd *sfp; 1088 struct scsi_device *sdev; 1089 1090 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1091 return -ENXIO; 1092 1093 sdev = sdp->device; 1094 if (sdev->host->hostt->compat_ioctl) { 1095 int ret; 1096 1097 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1098 1099 return ret; 1100 } 1101 1102 return -ENOIOCTLCMD; 1103 } 1104 #endif 1105 1106 static unsigned int 1107 sg_poll(struct file *filp, poll_table * wait) 1108 { 1109 unsigned int res = 0; 1110 Sg_device *sdp; 1111 Sg_fd *sfp; 1112 Sg_request *srp; 1113 int count = 0; 1114 unsigned long iflags; 1115 1116 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) 1117 || sfp->closed) 1118 return POLLERR; 1119 poll_wait(filp, &sfp->read_wait, wait); 1120 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1121 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1122 /* if any read waiting, flag it */ 1123 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1124 res = POLLIN | POLLRDNORM; 1125 ++count; 1126 } 1127 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1128 1129 if (sdp->detached) 1130 res |= POLLHUP; 1131 else if (!sfp->cmd_q) { 1132 if (0 == count) 1133 res |= POLLOUT | POLLWRNORM; 1134 } else if (count < SG_MAX_QUEUE) 1135 res |= POLLOUT | POLLWRNORM; 1136 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1137 sdp->disk->disk_name, (int) res)); 1138 return res; 1139 } 1140 1141 static int 1142 sg_fasync(int fd, struct file *filp, int mode) 1143 { 1144 Sg_device *sdp; 1145 Sg_fd *sfp; 1146 1147 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1148 return -ENXIO; 1149 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1150 sdp->disk->disk_name, mode)); 1151 1152 return fasync_helper(fd, filp, mode, &sfp->async_qp); 1153 } 1154 1155 static int 1156 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1157 { 1158 Sg_fd *sfp; 1159 unsigned long offset, len, sa; 1160 Sg_scatter_hold *rsv_schp; 1161 int k, length; 1162 1163 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1164 return VM_FAULT_SIGBUS; 1165 rsv_schp = &sfp->reserve; 1166 offset = vmf->pgoff << PAGE_SHIFT; 1167 if (offset >= rsv_schp->bufflen) 1168 return VM_FAULT_SIGBUS; 1169 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", 1170 offset, rsv_schp->k_use_sg)); 1171 sa = vma->vm_start; 1172 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1173 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1174 len = vma->vm_end - sa; 1175 len = (len < length) ? len : length; 1176 if (offset < len) { 1177 struct page *page = nth_page(rsv_schp->pages[k], 1178 offset >> PAGE_SHIFT); 1179 get_page(page); /* increment page count */ 1180 vmf->page = page; 1181 return 0; /* success */ 1182 } 1183 sa += len; 1184 offset -= len; 1185 } 1186 1187 return VM_FAULT_SIGBUS; 1188 } 1189 1190 static struct vm_operations_struct sg_mmap_vm_ops = { 1191 .fault = sg_vma_fault, 1192 }; 1193 1194 static int 1195 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1196 { 1197 Sg_fd *sfp; 1198 unsigned long req_sz, len, sa; 1199 Sg_scatter_hold *rsv_schp; 1200 int k, length; 1201 1202 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1203 return -ENXIO; 1204 req_sz = vma->vm_end - vma->vm_start; 1205 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1206 (void *) vma->vm_start, (int) req_sz)); 1207 if (vma->vm_pgoff) 1208 return -EINVAL; /* want no offset */ 1209 rsv_schp = &sfp->reserve; 1210 if (req_sz > rsv_schp->bufflen) 1211 return -ENOMEM; /* cannot map more than reserved buffer */ 1212 1213 sa = vma->vm_start; 1214 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1215 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1216 len = vma->vm_end - sa; 1217 len = (len < length) ? len : length; 1218 sa += len; 1219 } 1220 1221 sfp->mmap_called = 1; 1222 vma->vm_flags |= VM_RESERVED; 1223 vma->vm_private_data = sfp; 1224 vma->vm_ops = &sg_mmap_vm_ops; 1225 return 0; 1226 } 1227 1228 static void sg_rq_end_io_usercontext(struct work_struct *work) 1229 { 1230 struct sg_request *srp = container_of(work, struct sg_request, ew.work); 1231 struct sg_fd *sfp = srp->parentfp; 1232 1233 sg_finish_rem_req(srp); 1234 kref_put(&sfp->f_ref, sg_remove_sfp); 1235 } 1236 1237 /* 1238 * This function is a "bottom half" handler that is called by the mid 1239 * level when a command is completed (or has failed). 1240 */ 1241 static void sg_rq_end_io(struct request *rq, int uptodate) 1242 { 1243 struct sg_request *srp = rq->end_io_data; 1244 Sg_device *sdp; 1245 Sg_fd *sfp; 1246 unsigned long iflags; 1247 unsigned int ms; 1248 char *sense; 1249 int result, resid, done = 1; 1250 1251 if (WARN_ON(srp->done != 0)) 1252 return; 1253 1254 sfp = srp->parentfp; 1255 if (WARN_ON(sfp == NULL)) 1256 return; 1257 1258 sdp = sfp->parentdp; 1259 if (unlikely(sdp->detached)) 1260 printk(KERN_INFO "sg_rq_end_io: device detached\n"); 1261 1262 sense = rq->sense; 1263 result = rq->errors; 1264 resid = rq->resid_len; 1265 1266 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1267 sdp->disk->disk_name, srp->header.pack_id, result)); 1268 srp->header.resid = resid; 1269 ms = jiffies_to_msecs(jiffies); 1270 srp->header.duration = (ms > srp->header.duration) ? 1271 (ms - srp->header.duration) : 0; 1272 if (0 != result) { 1273 struct scsi_sense_hdr sshdr; 1274 1275 srp->header.status = 0xff & result; 1276 srp->header.masked_status = status_byte(result); 1277 srp->header.msg_status = msg_byte(result); 1278 srp->header.host_status = host_byte(result); 1279 srp->header.driver_status = driver_byte(result); 1280 if ((sdp->sgdebug > 0) && 1281 ((CHECK_CONDITION == srp->header.masked_status) || 1282 (COMMAND_TERMINATED == srp->header.masked_status))) 1283 __scsi_print_sense("sg_cmd_done", sense, 1284 SCSI_SENSE_BUFFERSIZE); 1285 1286 /* Following if statement is a patch supplied by Eric Youngdale */ 1287 if (driver_byte(result) != 0 1288 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1289 && !scsi_sense_is_deferred(&sshdr) 1290 && sshdr.sense_key == UNIT_ATTENTION 1291 && sdp->device->removable) { 1292 /* Detected possible disc change. Set the bit - this */ 1293 /* may be used if there are filesystems using this device */ 1294 sdp->device->changed = 1; 1295 } 1296 } 1297 /* Rely on write phase to clean out srp status values, so no "else" */ 1298 1299 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1300 if (unlikely(srp->orphan)) { 1301 if (sfp->keep_orphan) 1302 srp->sg_io_owned = 0; 1303 else 1304 done = 0; 1305 } 1306 srp->done = done; 1307 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1308 1309 if (likely(done)) { 1310 /* Now wake up any sg_read() that is waiting for this 1311 * packet. 1312 */ 1313 wake_up_interruptible(&sfp->read_wait); 1314 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1315 kref_put(&sfp->f_ref, sg_remove_sfp); 1316 } else { 1317 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); 1318 schedule_work(&srp->ew.work); 1319 } 1320 } 1321 1322 static struct file_operations sg_fops = { 1323 .owner = THIS_MODULE, 1324 .read = sg_read, 1325 .write = sg_write, 1326 .poll = sg_poll, 1327 .ioctl = sg_ioctl, 1328 #ifdef CONFIG_COMPAT 1329 .compat_ioctl = sg_compat_ioctl, 1330 #endif 1331 .open = sg_open, 1332 .mmap = sg_mmap, 1333 .release = sg_release, 1334 .fasync = sg_fasync, 1335 }; 1336 1337 static struct class *sg_sysfs_class; 1338 1339 static int sg_sysfs_valid = 0; 1340 1341 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1342 { 1343 struct request_queue *q = scsidp->request_queue; 1344 Sg_device *sdp; 1345 unsigned long iflags; 1346 int error; 1347 u32 k; 1348 1349 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1350 if (!sdp) { 1351 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1352 return ERR_PTR(-ENOMEM); 1353 } 1354 1355 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) { 1356 printk(KERN_WARNING "idr expansion Sg_device failure\n"); 1357 error = -ENOMEM; 1358 goto out; 1359 } 1360 1361 write_lock_irqsave(&sg_index_lock, iflags); 1362 1363 error = idr_get_new(&sg_index_idr, sdp, &k); 1364 if (error) { 1365 write_unlock_irqrestore(&sg_index_lock, iflags); 1366 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n", 1367 error); 1368 goto out; 1369 } 1370 1371 if (unlikely(k >= SG_MAX_DEVS)) 1372 goto overflow; 1373 1374 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1375 sprintf(disk->disk_name, "sg%d", k); 1376 disk->first_minor = k; 1377 sdp->disk = disk; 1378 sdp->device = scsidp; 1379 INIT_LIST_HEAD(&sdp->sfds); 1380 init_waitqueue_head(&sdp->o_excl_wait); 1381 sdp->sg_tablesize = min(queue_max_hw_segments(q), 1382 queue_max_phys_segments(q)); 1383 sdp->index = k; 1384 kref_init(&sdp->d_ref); 1385 1386 write_unlock_irqrestore(&sg_index_lock, iflags); 1387 1388 error = 0; 1389 out: 1390 if (error) { 1391 kfree(sdp); 1392 return ERR_PTR(error); 1393 } 1394 return sdp; 1395 1396 overflow: 1397 idr_remove(&sg_index_idr, k); 1398 write_unlock_irqrestore(&sg_index_lock, iflags); 1399 sdev_printk(KERN_WARNING, scsidp, 1400 "Unable to attach sg device type=%d, minor " 1401 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); 1402 error = -ENODEV; 1403 goto out; 1404 } 1405 1406 static int 1407 sg_add(struct device *cl_dev, struct class_interface *cl_intf) 1408 { 1409 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1410 struct gendisk *disk; 1411 Sg_device *sdp = NULL; 1412 struct cdev * cdev = NULL; 1413 int error; 1414 unsigned long iflags; 1415 1416 disk = alloc_disk(1); 1417 if (!disk) { 1418 printk(KERN_WARNING "alloc_disk failed\n"); 1419 return -ENOMEM; 1420 } 1421 disk->major = SCSI_GENERIC_MAJOR; 1422 1423 error = -ENOMEM; 1424 cdev = cdev_alloc(); 1425 if (!cdev) { 1426 printk(KERN_WARNING "cdev_alloc failed\n"); 1427 goto out; 1428 } 1429 cdev->owner = THIS_MODULE; 1430 cdev->ops = &sg_fops; 1431 1432 sdp = sg_alloc(disk, scsidp); 1433 if (IS_ERR(sdp)) { 1434 printk(KERN_WARNING "sg_alloc failed\n"); 1435 error = PTR_ERR(sdp); 1436 goto out; 1437 } 1438 1439 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); 1440 if (error) 1441 goto cdev_add_err; 1442 1443 sdp->cdev = cdev; 1444 if (sg_sysfs_valid) { 1445 struct device *sg_class_member; 1446 1447 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, 1448 MKDEV(SCSI_GENERIC_MAJOR, 1449 sdp->index), 1450 sdp, "%s", disk->disk_name); 1451 if (IS_ERR(sg_class_member)) { 1452 printk(KERN_ERR "sg_add: " 1453 "device_create failed\n"); 1454 error = PTR_ERR(sg_class_member); 1455 goto cdev_add_err; 1456 } 1457 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1458 &sg_class_member->kobj, "generic"); 1459 if (error) 1460 printk(KERN_ERR "sg_add: unable to make symlink " 1461 "'generic' back to sg%d\n", sdp->index); 1462 } else 1463 printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); 1464 1465 sdev_printk(KERN_NOTICE, scsidp, 1466 "Attached scsi generic sg%d type %d\n", sdp->index, 1467 scsidp->type); 1468 1469 dev_set_drvdata(cl_dev, sdp); 1470 1471 return 0; 1472 1473 cdev_add_err: 1474 write_lock_irqsave(&sg_index_lock, iflags); 1475 idr_remove(&sg_index_idr, sdp->index); 1476 write_unlock_irqrestore(&sg_index_lock, iflags); 1477 kfree(sdp); 1478 1479 out: 1480 put_disk(disk); 1481 if (cdev) 1482 cdev_del(cdev); 1483 return error; 1484 } 1485 1486 static void sg_device_destroy(struct kref *kref) 1487 { 1488 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); 1489 unsigned long flags; 1490 1491 /* CAUTION! Note that the device can still be found via idr_find() 1492 * even though the refcount is 0. Therefore, do idr_remove() BEFORE 1493 * any other cleanup. 1494 */ 1495 1496 write_lock_irqsave(&sg_index_lock, flags); 1497 idr_remove(&sg_index_idr, sdp->index); 1498 write_unlock_irqrestore(&sg_index_lock, flags); 1499 1500 SCSI_LOG_TIMEOUT(3, 1501 printk("sg_device_destroy: %s\n", 1502 sdp->disk->disk_name)); 1503 1504 put_disk(sdp->disk); 1505 kfree(sdp); 1506 } 1507 1508 static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf) 1509 { 1510 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1511 Sg_device *sdp = dev_get_drvdata(cl_dev); 1512 unsigned long iflags; 1513 Sg_fd *sfp; 1514 1515 if (!sdp || sdp->detached) 1516 return; 1517 1518 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name)); 1519 1520 /* Need a write lock to set sdp->detached. */ 1521 write_lock_irqsave(&sg_index_lock, iflags); 1522 sdp->detached = 1; 1523 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { 1524 wake_up_interruptible(&sfp->read_wait); 1525 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); 1526 } 1527 write_unlock_irqrestore(&sg_index_lock, iflags); 1528 1529 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1530 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); 1531 cdev_del(sdp->cdev); 1532 sdp->cdev = NULL; 1533 1534 sg_put_dev(sdp); 1535 } 1536 1537 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1538 module_param_named(def_reserved_size, def_reserved_size, int, 1539 S_IRUGO | S_IWUSR); 1540 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1541 1542 MODULE_AUTHOR("Douglas Gilbert"); 1543 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1544 MODULE_LICENSE("GPL"); 1545 MODULE_VERSION(SG_VERSION_STR); 1546 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1547 1548 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1549 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1550 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1551 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1552 1553 static int __init 1554 init_sg(void) 1555 { 1556 int rc; 1557 1558 if (scatter_elem_sz < PAGE_SIZE) { 1559 scatter_elem_sz = PAGE_SIZE; 1560 scatter_elem_sz_prev = scatter_elem_sz; 1561 } 1562 if (def_reserved_size >= 0) 1563 sg_big_buff = def_reserved_size; 1564 else 1565 def_reserved_size = sg_big_buff; 1566 1567 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1568 SG_MAX_DEVS, "sg"); 1569 if (rc) 1570 return rc; 1571 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1572 if ( IS_ERR(sg_sysfs_class) ) { 1573 rc = PTR_ERR(sg_sysfs_class); 1574 goto err_out; 1575 } 1576 sg_sysfs_valid = 1; 1577 rc = scsi_register_interface(&sg_interface); 1578 if (0 == rc) { 1579 #ifdef CONFIG_SCSI_PROC_FS 1580 sg_proc_init(); 1581 #endif /* CONFIG_SCSI_PROC_FS */ 1582 return 0; 1583 } 1584 class_destroy(sg_sysfs_class); 1585 err_out: 1586 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1587 return rc; 1588 } 1589 1590 static void __exit 1591 exit_sg(void) 1592 { 1593 #ifdef CONFIG_SCSI_PROC_FS 1594 sg_proc_cleanup(); 1595 #endif /* CONFIG_SCSI_PROC_FS */ 1596 scsi_unregister_interface(&sg_interface); 1597 class_destroy(sg_sysfs_class); 1598 sg_sysfs_valid = 0; 1599 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1600 SG_MAX_DEVS); 1601 idr_destroy(&sg_index_idr); 1602 } 1603 1604 static int sg_start_req(Sg_request *srp, unsigned char *cmd) 1605 { 1606 int res; 1607 struct request *rq; 1608 Sg_fd *sfp = srp->parentfp; 1609 sg_io_hdr_t *hp = &srp->header; 1610 int dxfer_len = (int) hp->dxfer_len; 1611 int dxfer_dir = hp->dxfer_direction; 1612 unsigned int iov_count = hp->iovec_count; 1613 Sg_scatter_hold *req_schp = &srp->data; 1614 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1615 struct request_queue *q = sfp->parentdp->device->request_queue; 1616 struct rq_map_data *md, map_data; 1617 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; 1618 1619 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n", 1620 dxfer_len)); 1621 1622 rq = blk_get_request(q, rw, GFP_ATOMIC); 1623 if (!rq) 1624 return -ENOMEM; 1625 1626 memcpy(rq->cmd, cmd, hp->cmd_len); 1627 1628 rq->cmd_len = hp->cmd_len; 1629 rq->cmd_type = REQ_TYPE_BLOCK_PC; 1630 1631 srp->rq = rq; 1632 rq->end_io_data = srp; 1633 rq->sense = srp->sense_b; 1634 rq->retries = SG_DEFAULT_RETRIES; 1635 1636 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1637 return 0; 1638 1639 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && 1640 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && 1641 !sfp->parentdp->device->host->unchecked_isa_dma && 1642 blk_rq_aligned(q, hp->dxferp, dxfer_len)) 1643 md = NULL; 1644 else 1645 md = &map_data; 1646 1647 if (md) { 1648 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) 1649 sg_link_reserve(sfp, srp, dxfer_len); 1650 else { 1651 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1652 if (res) 1653 return res; 1654 } 1655 1656 md->pages = req_schp->pages; 1657 md->page_order = req_schp->page_order; 1658 md->nr_entries = req_schp->k_use_sg; 1659 md->offset = 0; 1660 md->null_mapped = hp->dxferp ? 0 : 1; 1661 } 1662 1663 if (iov_count) { 1664 int len, size = sizeof(struct sg_iovec) * iov_count; 1665 struct iovec *iov; 1666 1667 iov = kmalloc(size, GFP_ATOMIC); 1668 if (!iov) 1669 return -ENOMEM; 1670 1671 if (copy_from_user(iov, hp->dxferp, size)) { 1672 kfree(iov); 1673 return -EFAULT; 1674 } 1675 1676 len = iov_length(iov, iov_count); 1677 if (hp->dxfer_len < len) { 1678 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len); 1679 len = hp->dxfer_len; 1680 } 1681 1682 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov, 1683 iov_count, 1684 len, GFP_ATOMIC); 1685 kfree(iov); 1686 } else 1687 res = blk_rq_map_user(q, rq, md, hp->dxferp, 1688 hp->dxfer_len, GFP_ATOMIC); 1689 1690 if (!res) { 1691 srp->bio = rq->bio; 1692 1693 if (!md) { 1694 req_schp->dio_in_use = 1; 1695 hp->info |= SG_INFO_DIRECT_IO; 1696 } 1697 } 1698 return res; 1699 } 1700 1701 static int sg_finish_rem_req(Sg_request * srp) 1702 { 1703 int ret = 0; 1704 1705 Sg_fd *sfp = srp->parentfp; 1706 Sg_scatter_hold *req_schp = &srp->data; 1707 1708 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1709 if (srp->res_used) 1710 sg_unlink_reserve(sfp, srp); 1711 else 1712 sg_remove_scat(req_schp); 1713 1714 if (srp->rq) { 1715 if (srp->bio) 1716 ret = blk_rq_unmap_user(srp->bio); 1717 1718 blk_put_request(srp->rq); 1719 } 1720 1721 sg_remove_request(sfp, srp); 1722 1723 return ret; 1724 } 1725 1726 static int 1727 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1728 { 1729 int sg_bufflen = tablesize * sizeof(struct page *); 1730 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1731 1732 schp->pages = kzalloc(sg_bufflen, gfp_flags); 1733 if (!schp->pages) 1734 return -ENOMEM; 1735 schp->sglist_len = sg_bufflen; 1736 return tablesize; /* number of scat_gath elements allocated */ 1737 } 1738 1739 static int 1740 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1741 { 1742 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; 1743 int sg_tablesize = sfp->parentdp->sg_tablesize; 1744 int blk_size = buff_size, order; 1745 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 1746 1747 if (blk_size < 0) 1748 return -EFAULT; 1749 if (0 == blk_size) 1750 ++blk_size; /* don't know why */ 1751 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1752 blk_size = ALIGN(blk_size, SG_SECTOR_SZ); 1753 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1754 buff_size, blk_size)); 1755 1756 /* N.B. ret_sz carried into this block ... */ 1757 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1758 if (mx_sc_elems < 0) 1759 return mx_sc_elems; /* most likely -ENOMEM */ 1760 1761 num = scatter_elem_sz; 1762 if (unlikely(num != scatter_elem_sz_prev)) { 1763 if (num < PAGE_SIZE) { 1764 scatter_elem_sz = PAGE_SIZE; 1765 scatter_elem_sz_prev = PAGE_SIZE; 1766 } else 1767 scatter_elem_sz_prev = num; 1768 } 1769 1770 if (sfp->low_dma) 1771 gfp_mask |= GFP_DMA; 1772 1773 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1774 gfp_mask |= __GFP_ZERO; 1775 1776 order = get_order(num); 1777 retry: 1778 ret_sz = 1 << (PAGE_SHIFT + order); 1779 1780 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; 1781 k++, rem_sz -= ret_sz) { 1782 1783 num = (rem_sz > scatter_elem_sz_prev) ? 1784 scatter_elem_sz_prev : rem_sz; 1785 1786 schp->pages[k] = alloc_pages(gfp_mask, order); 1787 if (!schp->pages[k]) 1788 goto out; 1789 1790 if (num == scatter_elem_sz_prev) { 1791 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1792 scatter_elem_sz = ret_sz; 1793 scatter_elem_sz_prev = ret_sz; 1794 } 1795 } 1796 1797 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " 1798 "ret_sz=%d\n", k, num, ret_sz)); 1799 } /* end of for loop */ 1800 1801 schp->page_order = order; 1802 schp->k_use_sg = k; 1803 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " 1804 "rem_sz=%d\n", k, rem_sz)); 1805 1806 schp->bufflen = blk_size; 1807 if (rem_sz > 0) /* must have failed */ 1808 return -ENOMEM; 1809 return 0; 1810 out: 1811 for (i = 0; i < k; i++) 1812 __free_pages(schp->pages[k], order); 1813 1814 if (--order >= 0) 1815 goto retry; 1816 1817 return -ENOMEM; 1818 } 1819 1820 static void 1821 sg_remove_scat(Sg_scatter_hold * schp) 1822 { 1823 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1824 if (schp->pages && schp->sglist_len > 0) { 1825 if (!schp->dio_in_use) { 1826 int k; 1827 1828 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1829 SCSI_LOG_TIMEOUT(5, printk( 1830 "sg_remove_scat: k=%d, pg=0x%p\n", 1831 k, schp->pages[k])); 1832 __free_pages(schp->pages[k], schp->page_order); 1833 } 1834 1835 kfree(schp->pages); 1836 } 1837 } 1838 memset(schp, 0, sizeof (*schp)); 1839 } 1840 1841 static int 1842 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 1843 { 1844 Sg_scatter_hold *schp = &srp->data; 1845 int k, num; 1846 1847 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 1848 num_read_xfer)); 1849 if ((!outp) || (num_read_xfer <= 0)) 1850 return 0; 1851 1852 num = 1 << (PAGE_SHIFT + schp->page_order); 1853 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1854 if (num > num_read_xfer) { 1855 if (__copy_to_user(outp, page_address(schp->pages[k]), 1856 num_read_xfer)) 1857 return -EFAULT; 1858 break; 1859 } else { 1860 if (__copy_to_user(outp, page_address(schp->pages[k]), 1861 num)) 1862 return -EFAULT; 1863 num_read_xfer -= num; 1864 if (num_read_xfer <= 0) 1865 break; 1866 outp += num; 1867 } 1868 } 1869 1870 return 0; 1871 } 1872 1873 static void 1874 sg_build_reserve(Sg_fd * sfp, int req_size) 1875 { 1876 Sg_scatter_hold *schp = &sfp->reserve; 1877 1878 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 1879 do { 1880 if (req_size < PAGE_SIZE) 1881 req_size = PAGE_SIZE; 1882 if (0 == sg_build_indirect(schp, sfp, req_size)) 1883 return; 1884 else 1885 sg_remove_scat(schp); 1886 req_size >>= 1; /* divide by 2 */ 1887 } while (req_size > (PAGE_SIZE / 2)); 1888 } 1889 1890 static void 1891 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 1892 { 1893 Sg_scatter_hold *req_schp = &srp->data; 1894 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1895 int k, num, rem; 1896 1897 srp->res_used = 1; 1898 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 1899 rem = size; 1900 1901 num = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1902 for (k = 0; k < rsv_schp->k_use_sg; k++) { 1903 if (rem <= num) { 1904 req_schp->k_use_sg = k + 1; 1905 req_schp->sglist_len = rsv_schp->sglist_len; 1906 req_schp->pages = rsv_schp->pages; 1907 1908 req_schp->bufflen = size; 1909 req_schp->page_order = rsv_schp->page_order; 1910 break; 1911 } else 1912 rem -= num; 1913 } 1914 1915 if (k >= rsv_schp->k_use_sg) 1916 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 1917 } 1918 1919 static void 1920 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 1921 { 1922 Sg_scatter_hold *req_schp = &srp->data; 1923 1924 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 1925 (int) req_schp->k_use_sg)); 1926 req_schp->k_use_sg = 0; 1927 req_schp->bufflen = 0; 1928 req_schp->pages = NULL; 1929 req_schp->page_order = 0; 1930 req_schp->sglist_len = 0; 1931 sfp->save_scat_len = 0; 1932 srp->res_used = 0; 1933 } 1934 1935 static Sg_request * 1936 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 1937 { 1938 Sg_request *resp; 1939 unsigned long iflags; 1940 1941 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1942 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 1943 /* look for requests that are ready + not SG_IO owned */ 1944 if ((1 == resp->done) && (!resp->sg_io_owned) && 1945 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 1946 resp->done = 2; /* guard against other readers */ 1947 break; 1948 } 1949 } 1950 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1951 return resp; 1952 } 1953 1954 /* always adds to end of list */ 1955 static Sg_request * 1956 sg_add_request(Sg_fd * sfp) 1957 { 1958 int k; 1959 unsigned long iflags; 1960 Sg_request *resp; 1961 Sg_request *rp = sfp->req_arr; 1962 1963 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1964 resp = sfp->headrp; 1965 if (!resp) { 1966 memset(rp, 0, sizeof (Sg_request)); 1967 rp->parentfp = sfp; 1968 resp = rp; 1969 sfp->headrp = resp; 1970 } else { 1971 if (0 == sfp->cmd_q) 1972 resp = NULL; /* command queuing disallowed */ 1973 else { 1974 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 1975 if (!rp->parentfp) 1976 break; 1977 } 1978 if (k < SG_MAX_QUEUE) { 1979 memset(rp, 0, sizeof (Sg_request)); 1980 rp->parentfp = sfp; 1981 while (resp->nextrp) 1982 resp = resp->nextrp; 1983 resp->nextrp = rp; 1984 resp = rp; 1985 } else 1986 resp = NULL; 1987 } 1988 } 1989 if (resp) { 1990 resp->nextrp = NULL; 1991 resp->header.duration = jiffies_to_msecs(jiffies); 1992 } 1993 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1994 return resp; 1995 } 1996 1997 /* Return of 1 for found; 0 for not found */ 1998 static int 1999 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2000 { 2001 Sg_request *prev_rp; 2002 Sg_request *rp; 2003 unsigned long iflags; 2004 int res = 0; 2005 2006 if ((!sfp) || (!srp) || (!sfp->headrp)) 2007 return res; 2008 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2009 prev_rp = sfp->headrp; 2010 if (srp == prev_rp) { 2011 sfp->headrp = prev_rp->nextrp; 2012 prev_rp->parentfp = NULL; 2013 res = 1; 2014 } else { 2015 while ((rp = prev_rp->nextrp)) { 2016 if (srp == rp) { 2017 prev_rp->nextrp = rp->nextrp; 2018 rp->parentfp = NULL; 2019 res = 1; 2020 break; 2021 } 2022 prev_rp = rp; 2023 } 2024 } 2025 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2026 return res; 2027 } 2028 2029 static Sg_fd * 2030 sg_add_sfp(Sg_device * sdp, int dev) 2031 { 2032 Sg_fd *sfp; 2033 unsigned long iflags; 2034 int bufflen; 2035 2036 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2037 if (!sfp) 2038 return NULL; 2039 2040 init_waitqueue_head(&sfp->read_wait); 2041 rwlock_init(&sfp->rq_list_lock); 2042 2043 kref_init(&sfp->f_ref); 2044 sfp->timeout = SG_DEFAULT_TIMEOUT; 2045 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2046 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2047 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2048 sdp->device->host->unchecked_isa_dma : 1; 2049 sfp->cmd_q = SG_DEF_COMMAND_Q; 2050 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2051 sfp->parentdp = sdp; 2052 write_lock_irqsave(&sg_index_lock, iflags); 2053 list_add_tail(&sfp->sfd_siblings, &sdp->sfds); 2054 write_unlock_irqrestore(&sg_index_lock, iflags); 2055 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2056 if (unlikely(sg_big_buff != def_reserved_size)) 2057 sg_big_buff = def_reserved_size; 2058 2059 bufflen = min_t(int, sg_big_buff, 2060 queue_max_sectors(sdp->device->request_queue) * 512); 2061 sg_build_reserve(sfp, bufflen); 2062 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2063 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2064 2065 kref_get(&sdp->d_ref); 2066 __module_get(THIS_MODULE); 2067 return sfp; 2068 } 2069 2070 static void sg_remove_sfp_usercontext(struct work_struct *work) 2071 { 2072 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); 2073 struct sg_device *sdp = sfp->parentdp; 2074 2075 /* Cleanup any responses which were never read(). */ 2076 while (sfp->headrp) 2077 sg_finish_rem_req(sfp->headrp); 2078 2079 if (sfp->reserve.bufflen > 0) { 2080 SCSI_LOG_TIMEOUT(6, 2081 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2082 (int) sfp->reserve.bufflen, 2083 (int) sfp->reserve.k_use_sg)); 2084 sg_remove_scat(&sfp->reserve); 2085 } 2086 2087 SCSI_LOG_TIMEOUT(6, 2088 printk("sg_remove_sfp: %s, sfp=0x%p\n", 2089 sdp->disk->disk_name, 2090 sfp)); 2091 kfree(sfp); 2092 2093 scsi_device_put(sdp->device); 2094 sg_put_dev(sdp); 2095 module_put(THIS_MODULE); 2096 } 2097 2098 static void sg_remove_sfp(struct kref *kref) 2099 { 2100 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); 2101 struct sg_device *sdp = sfp->parentdp; 2102 unsigned long iflags; 2103 2104 write_lock_irqsave(&sg_index_lock, iflags); 2105 list_del(&sfp->sfd_siblings); 2106 write_unlock_irqrestore(&sg_index_lock, iflags); 2107 wake_up_interruptible(&sdp->o_excl_wait); 2108 2109 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); 2110 schedule_work(&sfp->ew.work); 2111 } 2112 2113 static int 2114 sg_res_in_use(Sg_fd * sfp) 2115 { 2116 const Sg_request *srp; 2117 unsigned long iflags; 2118 2119 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2120 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2121 if (srp->res_used) 2122 break; 2123 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2124 return srp ? 1 : 0; 2125 } 2126 2127 #ifdef CONFIG_SCSI_PROC_FS 2128 static int 2129 sg_idr_max_id(int id, void *p, void *data) 2130 { 2131 int *k = data; 2132 2133 if (*k < id) 2134 *k = id; 2135 2136 return 0; 2137 } 2138 2139 static int 2140 sg_last_dev(void) 2141 { 2142 int k = -1; 2143 unsigned long iflags; 2144 2145 read_lock_irqsave(&sg_index_lock, iflags); 2146 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2147 read_unlock_irqrestore(&sg_index_lock, iflags); 2148 return k + 1; /* origin 1 */ 2149 } 2150 #endif 2151 2152 /* must be called with sg_index_lock held */ 2153 static Sg_device *sg_lookup_dev(int dev) 2154 { 2155 return idr_find(&sg_index_idr, dev); 2156 } 2157 2158 static Sg_device *sg_get_dev(int dev) 2159 { 2160 struct sg_device *sdp; 2161 unsigned long flags; 2162 2163 read_lock_irqsave(&sg_index_lock, flags); 2164 sdp = sg_lookup_dev(dev); 2165 if (!sdp) 2166 sdp = ERR_PTR(-ENXIO); 2167 else if (sdp->detached) { 2168 /* If sdp->detached, then the refcount may already be 0, in 2169 * which case it would be a bug to do kref_get(). 2170 */ 2171 sdp = ERR_PTR(-ENODEV); 2172 } else 2173 kref_get(&sdp->d_ref); 2174 read_unlock_irqrestore(&sg_index_lock, flags); 2175 2176 return sdp; 2177 } 2178 2179 static void sg_put_dev(struct sg_device *sdp) 2180 { 2181 kref_put(&sdp->d_ref, sg_device_destroy); 2182 } 2183 2184 #ifdef CONFIG_SCSI_PROC_FS 2185 2186 static struct proc_dir_entry *sg_proc_sgp = NULL; 2187 2188 static char sg_proc_sg_dirname[] = "scsi/sg"; 2189 2190 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2191 2192 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2193 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2194 size_t count, loff_t *off); 2195 static struct file_operations adio_fops = { 2196 /* .owner, .read and .llseek added in sg_proc_init() */ 2197 .open = sg_proc_single_open_adio, 2198 .write = sg_proc_write_adio, 2199 .release = single_release, 2200 }; 2201 2202 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2203 static ssize_t sg_proc_write_dressz(struct file *filp, 2204 const char __user *buffer, size_t count, loff_t *off); 2205 static struct file_operations dressz_fops = { 2206 .open = sg_proc_single_open_dressz, 2207 .write = sg_proc_write_dressz, 2208 .release = single_release, 2209 }; 2210 2211 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2212 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2213 static struct file_operations version_fops = { 2214 .open = sg_proc_single_open_version, 2215 .release = single_release, 2216 }; 2217 2218 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2219 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2220 static struct file_operations devhdr_fops = { 2221 .open = sg_proc_single_open_devhdr, 2222 .release = single_release, 2223 }; 2224 2225 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2226 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2227 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2228 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2229 static void dev_seq_stop(struct seq_file *s, void *v); 2230 static struct file_operations dev_fops = { 2231 .open = sg_proc_open_dev, 2232 .release = seq_release, 2233 }; 2234 static struct seq_operations dev_seq_ops = { 2235 .start = dev_seq_start, 2236 .next = dev_seq_next, 2237 .stop = dev_seq_stop, 2238 .show = sg_proc_seq_show_dev, 2239 }; 2240 2241 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2242 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2243 static struct file_operations devstrs_fops = { 2244 .open = sg_proc_open_devstrs, 2245 .release = seq_release, 2246 }; 2247 static struct seq_operations devstrs_seq_ops = { 2248 .start = dev_seq_start, 2249 .next = dev_seq_next, 2250 .stop = dev_seq_stop, 2251 .show = sg_proc_seq_show_devstrs, 2252 }; 2253 2254 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2255 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2256 static struct file_operations debug_fops = { 2257 .open = sg_proc_open_debug, 2258 .release = seq_release, 2259 }; 2260 static struct seq_operations debug_seq_ops = { 2261 .start = dev_seq_start, 2262 .next = dev_seq_next, 2263 .stop = dev_seq_stop, 2264 .show = sg_proc_seq_show_debug, 2265 }; 2266 2267 2268 struct sg_proc_leaf { 2269 const char * name; 2270 struct file_operations * fops; 2271 }; 2272 2273 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2274 {"allow_dio", &adio_fops}, 2275 {"debug", &debug_fops}, 2276 {"def_reserved_size", &dressz_fops}, 2277 {"device_hdr", &devhdr_fops}, 2278 {"devices", &dev_fops}, 2279 {"device_strs", &devstrs_fops}, 2280 {"version", &version_fops} 2281 }; 2282 2283 static int 2284 sg_proc_init(void) 2285 { 2286 int k, mask; 2287 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2288 struct sg_proc_leaf * leaf; 2289 2290 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2291 if (!sg_proc_sgp) 2292 return 1; 2293 for (k = 0; k < num_leaves; ++k) { 2294 leaf = &sg_proc_leaf_arr[k]; 2295 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2296 leaf->fops->owner = THIS_MODULE; 2297 leaf->fops->read = seq_read; 2298 leaf->fops->llseek = seq_lseek; 2299 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); 2300 } 2301 return 0; 2302 } 2303 2304 static void 2305 sg_proc_cleanup(void) 2306 { 2307 int k; 2308 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2309 2310 if (!sg_proc_sgp) 2311 return; 2312 for (k = 0; k < num_leaves; ++k) 2313 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2314 remove_proc_entry(sg_proc_sg_dirname, NULL); 2315 } 2316 2317 2318 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2319 { 2320 seq_printf(s, "%d\n", *((int *)s->private)); 2321 return 0; 2322 } 2323 2324 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2325 { 2326 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2327 } 2328 2329 static ssize_t 2330 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2331 size_t count, loff_t *off) 2332 { 2333 int num; 2334 char buff[11]; 2335 2336 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2337 return -EACCES; 2338 num = (count < 10) ? count : 10; 2339 if (copy_from_user(buff, buffer, num)) 2340 return -EFAULT; 2341 buff[num] = '\0'; 2342 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2343 return count; 2344 } 2345 2346 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2347 { 2348 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2349 } 2350 2351 static ssize_t 2352 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2353 size_t count, loff_t *off) 2354 { 2355 int num; 2356 unsigned long k = ULONG_MAX; 2357 char buff[11]; 2358 2359 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2360 return -EACCES; 2361 num = (count < 10) ? count : 10; 2362 if (copy_from_user(buff, buffer, num)) 2363 return -EFAULT; 2364 buff[num] = '\0'; 2365 k = simple_strtoul(buff, NULL, 10); 2366 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2367 sg_big_buff = k; 2368 return count; 2369 } 2370 return -ERANGE; 2371 } 2372 2373 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2374 { 2375 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2376 sg_version_date); 2377 return 0; 2378 } 2379 2380 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2381 { 2382 return single_open(file, sg_proc_seq_show_version, NULL); 2383 } 2384 2385 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2386 { 2387 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2388 "online\n"); 2389 return 0; 2390 } 2391 2392 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2393 { 2394 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2395 } 2396 2397 struct sg_proc_deviter { 2398 loff_t index; 2399 size_t max; 2400 }; 2401 2402 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2403 { 2404 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2405 2406 s->private = it; 2407 if (! it) 2408 return NULL; 2409 2410 it->index = *pos; 2411 it->max = sg_last_dev(); 2412 if (it->index >= it->max) 2413 return NULL; 2414 return it; 2415 } 2416 2417 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2418 { 2419 struct sg_proc_deviter * it = s->private; 2420 2421 *pos = ++it->index; 2422 return (it->index < it->max) ? it : NULL; 2423 } 2424 2425 static void dev_seq_stop(struct seq_file *s, void *v) 2426 { 2427 kfree(s->private); 2428 } 2429 2430 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2431 { 2432 return seq_open(file, &dev_seq_ops); 2433 } 2434 2435 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2436 { 2437 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2438 Sg_device *sdp; 2439 struct scsi_device *scsidp; 2440 unsigned long iflags; 2441 2442 read_lock_irqsave(&sg_index_lock, iflags); 2443 sdp = it ? sg_lookup_dev(it->index) : NULL; 2444 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2445 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2446 scsidp->host->host_no, scsidp->channel, 2447 scsidp->id, scsidp->lun, (int) scsidp->type, 2448 1, 2449 (int) scsidp->queue_depth, 2450 (int) scsidp->device_busy, 2451 (int) scsi_device_online(scsidp)); 2452 else 2453 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2454 read_unlock_irqrestore(&sg_index_lock, iflags); 2455 return 0; 2456 } 2457 2458 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2459 { 2460 return seq_open(file, &devstrs_seq_ops); 2461 } 2462 2463 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2464 { 2465 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2466 Sg_device *sdp; 2467 struct scsi_device *scsidp; 2468 unsigned long iflags; 2469 2470 read_lock_irqsave(&sg_index_lock, iflags); 2471 sdp = it ? sg_lookup_dev(it->index) : NULL; 2472 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2473 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2474 scsidp->vendor, scsidp->model, scsidp->rev); 2475 else 2476 seq_printf(s, "<no active device>\n"); 2477 read_unlock_irqrestore(&sg_index_lock, iflags); 2478 return 0; 2479 } 2480 2481 /* must be called while holding sg_index_lock */ 2482 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2483 { 2484 int k, m, new_interface, blen, usg; 2485 Sg_request *srp; 2486 Sg_fd *fp; 2487 const sg_io_hdr_t *hp; 2488 const char * cp; 2489 unsigned int ms; 2490 2491 k = 0; 2492 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { 2493 k++; 2494 read_lock(&fp->rq_list_lock); /* irqs already disabled */ 2495 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2496 "(res)sgat=%d low_dma=%d\n", k, 2497 jiffies_to_msecs(fp->timeout), 2498 fp->reserve.bufflen, 2499 (int) fp->reserve.k_use_sg, 2500 (int) fp->low_dma); 2501 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2502 (int) fp->cmd_q, (int) fp->force_packid, 2503 (int) fp->keep_orphan, (int) fp->closed); 2504 for (m = 0, srp = fp->headrp; 2505 srp != NULL; 2506 ++m, srp = srp->nextrp) { 2507 hp = &srp->header; 2508 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2509 if (srp->res_used) { 2510 if (new_interface && 2511 (SG_FLAG_MMAP_IO & hp->flags)) 2512 cp = " mmap>> "; 2513 else 2514 cp = " rb>> "; 2515 } else { 2516 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2517 cp = " dio>> "; 2518 else 2519 cp = " "; 2520 } 2521 seq_printf(s, cp); 2522 blen = srp->data.bufflen; 2523 usg = srp->data.k_use_sg; 2524 seq_printf(s, srp->done ? 2525 ((1 == srp->done) ? "rcv:" : "fin:") 2526 : "act:"); 2527 seq_printf(s, " id=%d blen=%d", 2528 srp->header.pack_id, blen); 2529 if (srp->done) 2530 seq_printf(s, " dur=%d", hp->duration); 2531 else { 2532 ms = jiffies_to_msecs(jiffies); 2533 seq_printf(s, " t_o/elap=%d/%d", 2534 (new_interface ? hp->timeout : 2535 jiffies_to_msecs(fp->timeout)), 2536 (ms > hp->duration ? ms - hp->duration : 0)); 2537 } 2538 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2539 (int) srp->data.cmd_opcode); 2540 } 2541 if (0 == m) 2542 seq_printf(s, " No requests active\n"); 2543 read_unlock(&fp->rq_list_lock); 2544 } 2545 } 2546 2547 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2548 { 2549 return seq_open(file, &debug_seq_ops); 2550 } 2551 2552 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2553 { 2554 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2555 Sg_device *sdp; 2556 unsigned long iflags; 2557 2558 if (it && (0 == it->index)) { 2559 seq_printf(s, "max_active_device=%d(origin 1)\n", 2560 (int)it->max); 2561 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2562 } 2563 2564 read_lock_irqsave(&sg_index_lock, iflags); 2565 sdp = it ? sg_lookup_dev(it->index) : NULL; 2566 if (sdp && !list_empty(&sdp->sfds)) { 2567 struct scsi_device *scsidp = sdp->device; 2568 2569 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); 2570 if (sdp->detached) 2571 seq_printf(s, "detached pending close "); 2572 else 2573 seq_printf 2574 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2575 scsidp->host->host_no, 2576 scsidp->channel, scsidp->id, 2577 scsidp->lun, 2578 scsidp->host->hostt->emulated); 2579 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2580 sdp->sg_tablesize, sdp->exclude); 2581 sg_proc_debug_helper(s, sdp); 2582 } 2583 read_unlock_irqrestore(&sg_index_lock, iflags); 2584 return 0; 2585 } 2586 2587 #endif /* CONFIG_SCSI_PROC_FS */ 2588 2589 module_init(init_sg); 2590 module_exit(exit_sg); 2591