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/aio.h> 39 #include <linux/errno.h> 40 #include <linux/mtio.h> 41 #include <linux/ioctl.h> 42 #include <linux/slab.h> 43 #include <linux/fcntl.h> 44 #include <linux/init.h> 45 #include <linux/poll.h> 46 #include <linux/moduleparam.h> 47 #include <linux/cdev.h> 48 #include <linux/idr.h> 49 #include <linux/seq_file.h> 50 #include <linux/blkdev.h> 51 #include <linux/delay.h> 52 #include <linux/blktrace_api.h> 53 #include <linux/mutex.h> 54 #include <linux/ratelimit.h> 55 56 #include "scsi.h" 57 #include <scsi/scsi_dbg.h> 58 #include <scsi/scsi_host.h> 59 #include <scsi/scsi_driver.h> 60 #include <scsi/scsi_ioctl.h> 61 #include <scsi/sg.h> 62 63 #include "scsi_logging.h" 64 65 #ifdef CONFIG_SCSI_PROC_FS 66 #include <linux/proc_fs.h> 67 static char *sg_version_date = "20061027"; 68 69 static int sg_proc_init(void); 70 static void sg_proc_cleanup(void); 71 #endif 72 73 #define SG_ALLOW_DIO_DEF 0 74 75 #define SG_MAX_DEVS 32768 76 77 /* 78 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 79 * Then when using 32 bit integers x * m may overflow during the calculation. 80 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 81 * calculates the same, but prevents the overflow when both m and d 82 * are "small" numbers (like HZ and USER_HZ). 83 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 84 * in 32 bits. 85 */ 86 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 87 88 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 89 90 int sg_big_buff = SG_DEF_RESERVED_SIZE; 91 /* N.B. This variable is readable and writeable via 92 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 93 of this size (or less if there is not enough memory) will be reserved 94 for use by this file descriptor. [Deprecated usage: this variable is also 95 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 96 the kernel (i.e. it is not a module).] */ 97 static int def_reserved_size = -1; /* picks up init parameter */ 98 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 99 100 static int scatter_elem_sz = SG_SCATTER_SZ; 101 static int scatter_elem_sz_prev = SG_SCATTER_SZ; 102 103 #define SG_SECTOR_SZ 512 104 105 static int sg_add(struct device *, struct class_interface *); 106 static void sg_remove(struct device *, struct class_interface *); 107 108 static DEFINE_SPINLOCK(sg_open_exclusive_lock); 109 110 static DEFINE_IDR(sg_index_idr); 111 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock 112 file descriptor list for device */ 113 114 static struct class_interface sg_interface = { 115 .add_dev = sg_add, 116 .remove_dev = sg_remove, 117 }; 118 119 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 120 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 121 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ 122 unsigned bufflen; /* Size of (aggregate) data buffer */ 123 struct page **pages; 124 int page_order; 125 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 126 unsigned char cmd_opcode; /* first byte of command */ 127 } Sg_scatter_hold; 128 129 struct sg_device; /* forward declarations */ 130 struct sg_fd; 131 132 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 133 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 134 struct sg_fd *parentfp; /* NULL -> not in use */ 135 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 136 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 137 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; 138 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 139 char orphan; /* 1 -> drop on sight, 0 -> normal */ 140 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 141 /* done protected by rq_list_lock */ 142 char done; /* 0->before bh, 1->before read, 2->read */ 143 struct request *rq; 144 struct bio *bio; 145 struct execute_work ew; 146 } Sg_request; 147 148 typedef struct sg_fd { /* holds the state of a file descriptor */ 149 /* sfd_siblings is protected by sg_index_lock */ 150 struct list_head sfd_siblings; 151 struct sg_device *parentdp; /* owning device */ 152 wait_queue_head_t read_wait; /* queue read until command done */ 153 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 154 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 155 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 156 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 157 unsigned save_scat_len; /* original length of trunc. scat. element */ 158 Sg_request *headrp; /* head of request slist, NULL->empty */ 159 struct fasync_struct *async_qp; /* used by asynchronous notification */ 160 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 161 char low_dma; /* as in parent but possibly overridden to 1 */ 162 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 163 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 164 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ 165 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 166 char mmap_called; /* 0 -> mmap() never called on this fd */ 167 struct kref f_ref; 168 struct execute_work ew; 169 } Sg_fd; 170 171 typedef struct sg_device { /* holds the state of each scsi generic device */ 172 struct scsi_device *device; 173 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ 174 int sg_tablesize; /* adapter's max scatter-gather table size */ 175 u32 index; /* device index number */ 176 /* sfds is protected by sg_index_lock */ 177 struct list_head sfds; 178 volatile char detached; /* 0->attached, 1->detached pending removal */ 179 /* exclude protected by sg_open_exclusive_lock */ 180 char exclude; /* opened for exclusive access */ 181 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 182 struct gendisk *disk; 183 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 184 struct kref d_ref; 185 } Sg_device; 186 187 /* tasklet or soft irq callback */ 188 static void sg_rq_end_io(struct request *rq, int uptodate); 189 static int sg_start_req(Sg_request *srp, unsigned char *cmd); 190 static int sg_finish_rem_req(Sg_request * srp); 191 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 192 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 193 Sg_request * srp); 194 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, 195 const char __user *buf, size_t count, int blocking, 196 int read_only, int sg_io_owned, Sg_request **o_srp); 197 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 198 unsigned char *cmnd, int timeout, int blocking); 199 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 200 static void sg_remove_scat(Sg_scatter_hold * schp); 201 static void sg_build_reserve(Sg_fd * sfp, int req_size); 202 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 203 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 204 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 205 static void sg_remove_sfp(struct kref *); 206 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 207 static Sg_request *sg_add_request(Sg_fd * sfp); 208 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 209 static int sg_res_in_use(Sg_fd * sfp); 210 static Sg_device *sg_get_dev(int dev); 211 static void sg_put_dev(Sg_device *sdp); 212 213 #define SZ_SG_HEADER sizeof(struct sg_header) 214 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 215 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 216 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 217 218 static int sg_allow_access(struct file *filp, unsigned char *cmd) 219 { 220 struct sg_fd *sfp = filp->private_data; 221 222 if (sfp->parentdp->device->type == TYPE_SCANNER) 223 return 0; 224 225 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); 226 } 227 228 static int get_exclude(Sg_device *sdp) 229 { 230 unsigned long flags; 231 int ret; 232 233 spin_lock_irqsave(&sg_open_exclusive_lock, flags); 234 ret = sdp->exclude; 235 spin_unlock_irqrestore(&sg_open_exclusive_lock, flags); 236 return ret; 237 } 238 239 static int set_exclude(Sg_device *sdp, char val) 240 { 241 unsigned long flags; 242 243 spin_lock_irqsave(&sg_open_exclusive_lock, flags); 244 sdp->exclude = val; 245 spin_unlock_irqrestore(&sg_open_exclusive_lock, flags); 246 return val; 247 } 248 249 static int sfds_list_empty(Sg_device *sdp) 250 { 251 unsigned long flags; 252 int ret; 253 254 read_lock_irqsave(&sg_index_lock, flags); 255 ret = list_empty(&sdp->sfds); 256 read_unlock_irqrestore(&sg_index_lock, flags); 257 return ret; 258 } 259 260 static int 261 sg_open(struct inode *inode, struct file *filp) 262 { 263 int dev = iminor(inode); 264 int flags = filp->f_flags; 265 struct request_queue *q; 266 Sg_device *sdp; 267 Sg_fd *sfp; 268 int res; 269 int retval; 270 271 nonseekable_open(inode, filp); 272 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 273 sdp = sg_get_dev(dev); 274 if (IS_ERR(sdp)) { 275 retval = PTR_ERR(sdp); 276 sdp = NULL; 277 goto sg_put; 278 } 279 280 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 281 /* Prevent the device driver from vanishing while we sleep */ 282 retval = scsi_device_get(sdp->device); 283 if (retval) 284 goto sg_put; 285 286 retval = scsi_autopm_get_device(sdp->device); 287 if (retval) 288 goto sdp_put; 289 290 if (!((flags & O_NONBLOCK) || 291 scsi_block_when_processing_errors(sdp->device))) { 292 retval = -ENXIO; 293 /* we are in error recovery for this device */ 294 goto error_out; 295 } 296 297 if (flags & O_EXCL) { 298 if (O_RDONLY == (flags & O_ACCMODE)) { 299 retval = -EPERM; /* Can't lock it with read only access */ 300 goto error_out; 301 } 302 if (!sfds_list_empty(sdp) && (flags & O_NONBLOCK)) { 303 retval = -EBUSY; 304 goto error_out; 305 } 306 res = wait_event_interruptible(sdp->o_excl_wait, 307 ((!sfds_list_empty(sdp) || get_exclude(sdp)) ? 0 : set_exclude(sdp, 1))); 308 if (res) { 309 retval = res; /* -ERESTARTSYS because signal hit process */ 310 goto error_out; 311 } 312 } else if (get_exclude(sdp)) { /* some other fd has an exclusive lock on dev */ 313 if (flags & O_NONBLOCK) { 314 retval = -EBUSY; 315 goto error_out; 316 } 317 res = wait_event_interruptible(sdp->o_excl_wait, !get_exclude(sdp)); 318 if (res) { 319 retval = res; /* -ERESTARTSYS because signal hit process */ 320 goto error_out; 321 } 322 } 323 if (sdp->detached) { 324 retval = -ENODEV; 325 goto error_out; 326 } 327 if (sfds_list_empty(sdp)) { /* no existing opens on this device */ 328 sdp->sgdebug = 0; 329 q = sdp->device->request_queue; 330 sdp->sg_tablesize = queue_max_segments(q); 331 } 332 if ((sfp = sg_add_sfp(sdp, dev))) 333 filp->private_data = sfp; 334 else { 335 if (flags & O_EXCL) { 336 set_exclude(sdp, 0); /* undo if error */ 337 wake_up_interruptible(&sdp->o_excl_wait); 338 } 339 retval = -ENOMEM; 340 goto error_out; 341 } 342 retval = 0; 343 error_out: 344 if (retval) { 345 scsi_autopm_put_device(sdp->device); 346 sdp_put: 347 scsi_device_put(sdp->device); 348 } 349 sg_put: 350 if (sdp) 351 sg_put_dev(sdp); 352 return retval; 353 } 354 355 /* Following function was formerly called 'sg_close' */ 356 static int 357 sg_release(struct inode *inode, struct file *filp) 358 { 359 Sg_device *sdp; 360 Sg_fd *sfp; 361 362 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 363 return -ENXIO; 364 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 365 366 set_exclude(sdp, 0); 367 wake_up_interruptible(&sdp->o_excl_wait); 368 369 scsi_autopm_put_device(sdp->device); 370 kref_put(&sfp->f_ref, sg_remove_sfp); 371 return 0; 372 } 373 374 static ssize_t 375 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 376 { 377 Sg_device *sdp; 378 Sg_fd *sfp; 379 Sg_request *srp; 380 int req_pack_id = -1; 381 sg_io_hdr_t *hp; 382 struct sg_header *old_hdr = NULL; 383 int retval = 0; 384 385 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 386 return -ENXIO; 387 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 388 sdp->disk->disk_name, (int) count)); 389 390 if (!access_ok(VERIFY_WRITE, buf, count)) 391 return -EFAULT; 392 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 393 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 394 if (!old_hdr) 395 return -ENOMEM; 396 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 397 retval = -EFAULT; 398 goto free_old_hdr; 399 } 400 if (old_hdr->reply_len < 0) { 401 if (count >= SZ_SG_IO_HDR) { 402 sg_io_hdr_t *new_hdr; 403 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 404 if (!new_hdr) { 405 retval = -ENOMEM; 406 goto free_old_hdr; 407 } 408 retval =__copy_from_user 409 (new_hdr, buf, SZ_SG_IO_HDR); 410 req_pack_id = new_hdr->pack_id; 411 kfree(new_hdr); 412 if (retval) { 413 retval = -EFAULT; 414 goto free_old_hdr; 415 } 416 } 417 } else 418 req_pack_id = old_hdr->pack_id; 419 } 420 srp = sg_get_rq_mark(sfp, req_pack_id); 421 if (!srp) { /* now wait on packet to arrive */ 422 if (sdp->detached) { 423 retval = -ENODEV; 424 goto free_old_hdr; 425 } 426 if (filp->f_flags & O_NONBLOCK) { 427 retval = -EAGAIN; 428 goto free_old_hdr; 429 } 430 retval = wait_event_interruptible(sfp->read_wait, 431 (sdp->detached || 432 (srp = sg_get_rq_mark(sfp, req_pack_id)))); 433 if (sdp->detached) { 434 retval = -ENODEV; 435 goto free_old_hdr; 436 } 437 if (retval) { 438 /* -ERESTARTSYS as signal hit process */ 439 goto free_old_hdr; 440 } 441 } 442 if (srp->header.interface_id != '\0') { 443 retval = sg_new_read(sfp, buf, count, srp); 444 goto free_old_hdr; 445 } 446 447 hp = &srp->header; 448 if (old_hdr == NULL) { 449 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 450 if (! old_hdr) { 451 retval = -ENOMEM; 452 goto free_old_hdr; 453 } 454 } 455 memset(old_hdr, 0, SZ_SG_HEADER); 456 old_hdr->reply_len = (int) hp->timeout; 457 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 458 old_hdr->pack_id = hp->pack_id; 459 old_hdr->twelve_byte = 460 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 461 old_hdr->target_status = hp->masked_status; 462 old_hdr->host_status = hp->host_status; 463 old_hdr->driver_status = hp->driver_status; 464 if ((CHECK_CONDITION & hp->masked_status) || 465 (DRIVER_SENSE & hp->driver_status)) 466 memcpy(old_hdr->sense_buffer, srp->sense_b, 467 sizeof (old_hdr->sense_buffer)); 468 switch (hp->host_status) { 469 /* This setup of 'result' is for backward compatibility and is best 470 ignored by the user who should use target, host + driver status */ 471 case DID_OK: 472 case DID_PASSTHROUGH: 473 case DID_SOFT_ERROR: 474 old_hdr->result = 0; 475 break; 476 case DID_NO_CONNECT: 477 case DID_BUS_BUSY: 478 case DID_TIME_OUT: 479 old_hdr->result = EBUSY; 480 break; 481 case DID_BAD_TARGET: 482 case DID_ABORT: 483 case DID_PARITY: 484 case DID_RESET: 485 case DID_BAD_INTR: 486 old_hdr->result = EIO; 487 break; 488 case DID_ERROR: 489 old_hdr->result = (srp->sense_b[0] == 0 && 490 hp->masked_status == GOOD) ? 0 : EIO; 491 break; 492 default: 493 old_hdr->result = EIO; 494 break; 495 } 496 497 /* Now copy the result back to the user buffer. */ 498 if (count >= SZ_SG_HEADER) { 499 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 500 retval = -EFAULT; 501 goto free_old_hdr; 502 } 503 buf += SZ_SG_HEADER; 504 if (count > old_hdr->reply_len) 505 count = old_hdr->reply_len; 506 if (count > SZ_SG_HEADER) { 507 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 508 retval = -EFAULT; 509 goto free_old_hdr; 510 } 511 } 512 } else 513 count = (old_hdr->result == 0) ? 0 : -EIO; 514 sg_finish_rem_req(srp); 515 retval = count; 516 free_old_hdr: 517 kfree(old_hdr); 518 return retval; 519 } 520 521 static ssize_t 522 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 523 { 524 sg_io_hdr_t *hp = &srp->header; 525 int err = 0; 526 int len; 527 528 if (count < SZ_SG_IO_HDR) { 529 err = -EINVAL; 530 goto err_out; 531 } 532 hp->sb_len_wr = 0; 533 if ((hp->mx_sb_len > 0) && hp->sbp) { 534 if ((CHECK_CONDITION & hp->masked_status) || 535 (DRIVER_SENSE & hp->driver_status)) { 536 int sb_len = SCSI_SENSE_BUFFERSIZE; 537 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 538 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 539 len = (len > sb_len) ? sb_len : len; 540 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 541 err = -EFAULT; 542 goto err_out; 543 } 544 hp->sb_len_wr = len; 545 } 546 } 547 if (hp->masked_status || hp->host_status || hp->driver_status) 548 hp->info |= SG_INFO_CHECK; 549 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 550 err = -EFAULT; 551 goto err_out; 552 } 553 err_out: 554 err = sg_finish_rem_req(srp); 555 return (0 == err) ? count : err; 556 } 557 558 static ssize_t 559 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 560 { 561 int mxsize, cmd_size, k; 562 int input_size, blocking; 563 unsigned char opcode; 564 Sg_device *sdp; 565 Sg_fd *sfp; 566 Sg_request *srp; 567 struct sg_header old_hdr; 568 sg_io_hdr_t *hp; 569 unsigned char cmnd[MAX_COMMAND_SIZE]; 570 571 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 572 return -ENXIO; 573 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 574 sdp->disk->disk_name, (int) count)); 575 if (sdp->detached) 576 return -ENODEV; 577 if (!((filp->f_flags & O_NONBLOCK) || 578 scsi_block_when_processing_errors(sdp->device))) 579 return -ENXIO; 580 581 if (!access_ok(VERIFY_READ, buf, count)) 582 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 583 if (count < SZ_SG_HEADER) 584 return -EIO; 585 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 586 return -EFAULT; 587 blocking = !(filp->f_flags & O_NONBLOCK); 588 if (old_hdr.reply_len < 0) 589 return sg_new_write(sfp, filp, buf, count, 590 blocking, 0, 0, NULL); 591 if (count < (SZ_SG_HEADER + 6)) 592 return -EIO; /* The minimum scsi command length is 6 bytes. */ 593 594 if (!(srp = sg_add_request(sfp))) { 595 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 596 return -EDOM; 597 } 598 buf += SZ_SG_HEADER; 599 __get_user(opcode, buf); 600 if (sfp->next_cmd_len > 0) { 601 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 602 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 603 sfp->next_cmd_len = 0; 604 sg_remove_request(sfp, srp); 605 return -EIO; 606 } 607 cmd_size = sfp->next_cmd_len; 608 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 609 } else { 610 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 611 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 612 cmd_size = 12; 613 } 614 SCSI_LOG_TIMEOUT(4, printk( 615 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 616 /* Determine buffer size. */ 617 input_size = count - cmd_size; 618 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 619 mxsize -= SZ_SG_HEADER; 620 input_size -= SZ_SG_HEADER; 621 if (input_size < 0) { 622 sg_remove_request(sfp, srp); 623 return -EIO; /* User did not pass enough bytes for this command. */ 624 } 625 hp = &srp->header; 626 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 627 hp->cmd_len = (unsigned char) cmd_size; 628 hp->iovec_count = 0; 629 hp->mx_sb_len = 0; 630 if (input_size > 0) 631 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 632 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 633 else 634 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 635 hp->dxfer_len = mxsize; 636 if (hp->dxfer_direction == SG_DXFER_TO_DEV) 637 hp->dxferp = (char __user *)buf + cmd_size; 638 else 639 hp->dxferp = NULL; 640 hp->sbp = NULL; 641 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 642 hp->flags = input_size; /* structure abuse ... */ 643 hp->pack_id = old_hdr.pack_id; 644 hp->usr_ptr = NULL; 645 if (__copy_from_user(cmnd, buf, cmd_size)) 646 return -EFAULT; 647 /* 648 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 649 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 650 * is a non-zero input_size, so emit a warning. 651 */ 652 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { 653 static char cmd[TASK_COMM_LEN]; 654 if (strcmp(current->comm, cmd)) { 655 printk_ratelimited(KERN_WARNING 656 "sg_write: data in/out %d/%d bytes " 657 "for SCSI command 0x%x-- guessing " 658 "data in;\n program %s not setting " 659 "count and/or reply_len properly\n", 660 old_hdr.reply_len - (int)SZ_SG_HEADER, 661 input_size, (unsigned int) cmnd[0], 662 current->comm); 663 strcpy(cmd, current->comm); 664 } 665 } 666 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 667 return (k < 0) ? k : count; 668 } 669 670 static ssize_t 671 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, 672 size_t count, int blocking, int read_only, int sg_io_owned, 673 Sg_request **o_srp) 674 { 675 int k; 676 Sg_request *srp; 677 sg_io_hdr_t *hp; 678 unsigned char cmnd[MAX_COMMAND_SIZE]; 679 int timeout; 680 unsigned long ul_timeout; 681 682 if (count < SZ_SG_IO_HDR) 683 return -EINVAL; 684 if (!access_ok(VERIFY_READ, buf, count)) 685 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 686 687 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 688 if (!(srp = sg_add_request(sfp))) { 689 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 690 return -EDOM; 691 } 692 srp->sg_io_owned = sg_io_owned; 693 hp = &srp->header; 694 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 695 sg_remove_request(sfp, srp); 696 return -EFAULT; 697 } 698 if (hp->interface_id != 'S') { 699 sg_remove_request(sfp, srp); 700 return -ENOSYS; 701 } 702 if (hp->flags & SG_FLAG_MMAP_IO) { 703 if (hp->dxfer_len > sfp->reserve.bufflen) { 704 sg_remove_request(sfp, srp); 705 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 706 } 707 if (hp->flags & SG_FLAG_DIRECT_IO) { 708 sg_remove_request(sfp, srp); 709 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 710 } 711 if (sg_res_in_use(sfp)) { 712 sg_remove_request(sfp, srp); 713 return -EBUSY; /* reserve buffer already being used */ 714 } 715 } 716 ul_timeout = msecs_to_jiffies(srp->header.timeout); 717 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 718 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 719 sg_remove_request(sfp, srp); 720 return -EMSGSIZE; 721 } 722 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 723 sg_remove_request(sfp, srp); 724 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 725 } 726 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 727 sg_remove_request(sfp, srp); 728 return -EFAULT; 729 } 730 if (read_only && sg_allow_access(file, cmnd)) { 731 sg_remove_request(sfp, srp); 732 return -EPERM; 733 } 734 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 735 if (k < 0) 736 return k; 737 if (o_srp) 738 *o_srp = srp; 739 return count; 740 } 741 742 static int 743 sg_common_write(Sg_fd * sfp, Sg_request * srp, 744 unsigned char *cmnd, int timeout, int blocking) 745 { 746 int k, data_dir; 747 Sg_device *sdp = sfp->parentdp; 748 sg_io_hdr_t *hp = &srp->header; 749 750 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 751 hp->status = 0; 752 hp->masked_status = 0; 753 hp->msg_status = 0; 754 hp->info = 0; 755 hp->host_status = 0; 756 hp->driver_status = 0; 757 hp->resid = 0; 758 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 759 (int) cmnd[0], (int) hp->cmd_len)); 760 761 k = sg_start_req(srp, cmnd); 762 if (k) { 763 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); 764 sg_finish_rem_req(srp); 765 return k; /* probably out of space --> ENOMEM */ 766 } 767 if (sdp->detached) { 768 if (srp->bio) 769 blk_end_request_all(srp->rq, -EIO); 770 sg_finish_rem_req(srp); 771 return -ENODEV; 772 } 773 774 switch (hp->dxfer_direction) { 775 case SG_DXFER_TO_FROM_DEV: 776 case SG_DXFER_FROM_DEV: 777 data_dir = DMA_FROM_DEVICE; 778 break; 779 case SG_DXFER_TO_DEV: 780 data_dir = DMA_TO_DEVICE; 781 break; 782 case SG_DXFER_UNKNOWN: 783 data_dir = DMA_BIDIRECTIONAL; 784 break; 785 default: 786 data_dir = DMA_NONE; 787 break; 788 } 789 hp->duration = jiffies_to_msecs(jiffies); 790 791 srp->rq->timeout = timeout; 792 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ 793 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, 794 srp->rq, 1, sg_rq_end_io); 795 return 0; 796 } 797 798 static int srp_done(Sg_fd *sfp, Sg_request *srp) 799 { 800 unsigned long flags; 801 int ret; 802 803 read_lock_irqsave(&sfp->rq_list_lock, flags); 804 ret = srp->done; 805 read_unlock_irqrestore(&sfp->rq_list_lock, flags); 806 return ret; 807 } 808 809 static long 810 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 811 { 812 void __user *p = (void __user *)arg; 813 int __user *ip = p; 814 int result, val, read_only; 815 Sg_device *sdp; 816 Sg_fd *sfp; 817 Sg_request *srp; 818 unsigned long iflags; 819 820 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 821 return -ENXIO; 822 823 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 824 sdp->disk->disk_name, (int) cmd_in)); 825 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 826 827 switch (cmd_in) { 828 case SG_IO: 829 if (sdp->detached) 830 return -ENODEV; 831 if (!scsi_block_when_processing_errors(sdp->device)) 832 return -ENXIO; 833 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 834 return -EFAULT; 835 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, 836 1, read_only, 1, &srp); 837 if (result < 0) 838 return result; 839 result = wait_event_interruptible(sfp->read_wait, 840 (srp_done(sfp, srp) || sdp->detached)); 841 if (sdp->detached) 842 return -ENODEV; 843 write_lock_irq(&sfp->rq_list_lock); 844 if (srp->done) { 845 srp->done = 2; 846 write_unlock_irq(&sfp->rq_list_lock); 847 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 848 return (result < 0) ? result : 0; 849 } 850 srp->orphan = 1; 851 write_unlock_irq(&sfp->rq_list_lock); 852 return result; /* -ERESTARTSYS because signal hit process */ 853 case SG_SET_TIMEOUT: 854 result = get_user(val, ip); 855 if (result) 856 return result; 857 if (val < 0) 858 return -EIO; 859 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 860 val = MULDIV (INT_MAX, USER_HZ, HZ); 861 sfp->timeout_user = val; 862 sfp->timeout = MULDIV (val, HZ, USER_HZ); 863 864 return 0; 865 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 866 /* strange ..., for backward compatibility */ 867 return sfp->timeout_user; 868 case SG_SET_FORCE_LOW_DMA: 869 result = get_user(val, ip); 870 if (result) 871 return result; 872 if (val) { 873 sfp->low_dma = 1; 874 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 875 val = (int) sfp->reserve.bufflen; 876 sg_remove_scat(&sfp->reserve); 877 sg_build_reserve(sfp, val); 878 } 879 } else { 880 if (sdp->detached) 881 return -ENODEV; 882 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 883 } 884 return 0; 885 case SG_GET_LOW_DMA: 886 return put_user((int) sfp->low_dma, ip); 887 case SG_GET_SCSI_ID: 888 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 889 return -EFAULT; 890 else { 891 sg_scsi_id_t __user *sg_idp = p; 892 893 if (sdp->detached) 894 return -ENODEV; 895 __put_user((int) sdp->device->host->host_no, 896 &sg_idp->host_no); 897 __put_user((int) sdp->device->channel, 898 &sg_idp->channel); 899 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 900 __put_user((int) sdp->device->lun, &sg_idp->lun); 901 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 902 __put_user((short) sdp->device->host->cmd_per_lun, 903 &sg_idp->h_cmd_per_lun); 904 __put_user((short) sdp->device->queue_depth, 905 &sg_idp->d_queue_depth); 906 __put_user(0, &sg_idp->unused[0]); 907 __put_user(0, &sg_idp->unused[1]); 908 return 0; 909 } 910 case SG_SET_FORCE_PACK_ID: 911 result = get_user(val, ip); 912 if (result) 913 return result; 914 sfp->force_packid = val ? 1 : 0; 915 return 0; 916 case SG_GET_PACK_ID: 917 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 918 return -EFAULT; 919 read_lock_irqsave(&sfp->rq_list_lock, iflags); 920 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 921 if ((1 == srp->done) && (!srp->sg_io_owned)) { 922 read_unlock_irqrestore(&sfp->rq_list_lock, 923 iflags); 924 __put_user(srp->header.pack_id, ip); 925 return 0; 926 } 927 } 928 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 929 __put_user(-1, ip); 930 return 0; 931 case SG_GET_NUM_WAITING: 932 read_lock_irqsave(&sfp->rq_list_lock, iflags); 933 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 934 if ((1 == srp->done) && (!srp->sg_io_owned)) 935 ++val; 936 } 937 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 938 return put_user(val, ip); 939 case SG_GET_SG_TABLESIZE: 940 return put_user(sdp->sg_tablesize, ip); 941 case SG_SET_RESERVED_SIZE: 942 result = get_user(val, ip); 943 if (result) 944 return result; 945 if (val < 0) 946 return -EINVAL; 947 val = min_t(int, val, 948 queue_max_sectors(sdp->device->request_queue) * 512); 949 if (val != sfp->reserve.bufflen) { 950 if (sg_res_in_use(sfp) || sfp->mmap_called) 951 return -EBUSY; 952 sg_remove_scat(&sfp->reserve); 953 sg_build_reserve(sfp, val); 954 } 955 return 0; 956 case SG_GET_RESERVED_SIZE: 957 val = min_t(int, sfp->reserve.bufflen, 958 queue_max_sectors(sdp->device->request_queue) * 512); 959 return put_user(val, ip); 960 case SG_SET_COMMAND_Q: 961 result = get_user(val, ip); 962 if (result) 963 return result; 964 sfp->cmd_q = val ? 1 : 0; 965 return 0; 966 case SG_GET_COMMAND_Q: 967 return put_user((int) sfp->cmd_q, ip); 968 case SG_SET_KEEP_ORPHAN: 969 result = get_user(val, ip); 970 if (result) 971 return result; 972 sfp->keep_orphan = val; 973 return 0; 974 case SG_GET_KEEP_ORPHAN: 975 return put_user((int) sfp->keep_orphan, ip); 976 case SG_NEXT_CMD_LEN: 977 result = get_user(val, ip); 978 if (result) 979 return result; 980 sfp->next_cmd_len = (val > 0) ? val : 0; 981 return 0; 982 case SG_GET_VERSION_NUM: 983 return put_user(sg_version_num, ip); 984 case SG_GET_ACCESS_COUNT: 985 /* faked - we don't have a real access count anymore */ 986 val = (sdp->device ? 1 : 0); 987 return put_user(val, ip); 988 case SG_GET_REQUEST_TABLE: 989 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 990 return -EFAULT; 991 else { 992 sg_req_info_t *rinfo; 993 unsigned int ms; 994 995 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 996 GFP_KERNEL); 997 if (!rinfo) 998 return -ENOMEM; 999 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1000 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 1001 ++val, srp = srp ? srp->nextrp : srp) { 1002 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 1003 if (srp) { 1004 rinfo[val].req_state = srp->done + 1; 1005 rinfo[val].problem = 1006 srp->header.masked_status & 1007 srp->header.host_status & 1008 srp->header.driver_status; 1009 if (srp->done) 1010 rinfo[val].duration = 1011 srp->header.duration; 1012 else { 1013 ms = jiffies_to_msecs(jiffies); 1014 rinfo[val].duration = 1015 (ms > srp->header.duration) ? 1016 (ms - srp->header.duration) : 0; 1017 } 1018 rinfo[val].orphan = srp->orphan; 1019 rinfo[val].sg_io_owned = 1020 srp->sg_io_owned; 1021 rinfo[val].pack_id = 1022 srp->header.pack_id; 1023 rinfo[val].usr_ptr = 1024 srp->header.usr_ptr; 1025 } 1026 } 1027 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1028 result = __copy_to_user(p, rinfo, 1029 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 1030 result = result ? -EFAULT : 0; 1031 kfree(rinfo); 1032 return result; 1033 } 1034 case SG_EMULATED_HOST: 1035 if (sdp->detached) 1036 return -ENODEV; 1037 return put_user(sdp->device->host->hostt->emulated, ip); 1038 case SG_SCSI_RESET: 1039 if (sdp->detached) 1040 return -ENODEV; 1041 if (filp->f_flags & O_NONBLOCK) { 1042 if (scsi_host_in_recovery(sdp->device->host)) 1043 return -EBUSY; 1044 } else if (!scsi_block_when_processing_errors(sdp->device)) 1045 return -EBUSY; 1046 result = get_user(val, ip); 1047 if (result) 1048 return result; 1049 if (SG_SCSI_RESET_NOTHING == val) 1050 return 0; 1051 switch (val) { 1052 case SG_SCSI_RESET_DEVICE: 1053 val = SCSI_TRY_RESET_DEVICE; 1054 break; 1055 case SG_SCSI_RESET_TARGET: 1056 val = SCSI_TRY_RESET_TARGET; 1057 break; 1058 case SG_SCSI_RESET_BUS: 1059 val = SCSI_TRY_RESET_BUS; 1060 break; 1061 case SG_SCSI_RESET_HOST: 1062 val = SCSI_TRY_RESET_HOST; 1063 break; 1064 default: 1065 return -EINVAL; 1066 } 1067 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1068 return -EACCES; 1069 return (scsi_reset_provider(sdp->device, val) == 1070 SUCCESS) ? 0 : -EIO; 1071 case SCSI_IOCTL_SEND_COMMAND: 1072 if (sdp->detached) 1073 return -ENODEV; 1074 if (read_only) { 1075 unsigned char opcode = WRITE_6; 1076 Scsi_Ioctl_Command __user *siocp = p; 1077 1078 if (copy_from_user(&opcode, siocp->data, 1)) 1079 return -EFAULT; 1080 if (sg_allow_access(filp, &opcode)) 1081 return -EPERM; 1082 } 1083 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); 1084 case SG_SET_DEBUG: 1085 result = get_user(val, ip); 1086 if (result) 1087 return result; 1088 sdp->sgdebug = (char) val; 1089 return 0; 1090 case SCSI_IOCTL_GET_IDLUN: 1091 case SCSI_IOCTL_GET_BUS_NUMBER: 1092 case SCSI_IOCTL_PROBE_HOST: 1093 case SG_GET_TRANSFORM: 1094 if (sdp->detached) 1095 return -ENODEV; 1096 return scsi_ioctl(sdp->device, cmd_in, p); 1097 case BLKSECTGET: 1098 return put_user(queue_max_sectors(sdp->device->request_queue) * 512, 1099 ip); 1100 case BLKTRACESETUP: 1101 return blk_trace_setup(sdp->device->request_queue, 1102 sdp->disk->disk_name, 1103 MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1104 NULL, 1105 (char *)arg); 1106 case BLKTRACESTART: 1107 return blk_trace_startstop(sdp->device->request_queue, 1); 1108 case BLKTRACESTOP: 1109 return blk_trace_startstop(sdp->device->request_queue, 0); 1110 case BLKTRACETEARDOWN: 1111 return blk_trace_remove(sdp->device->request_queue); 1112 default: 1113 if (read_only) 1114 return -EPERM; /* don't know so take safe approach */ 1115 return scsi_ioctl(sdp->device, cmd_in, p); 1116 } 1117 } 1118 1119 #ifdef CONFIG_COMPAT 1120 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1121 { 1122 Sg_device *sdp; 1123 Sg_fd *sfp; 1124 struct scsi_device *sdev; 1125 1126 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1127 return -ENXIO; 1128 1129 sdev = sdp->device; 1130 if (sdev->host->hostt->compat_ioctl) { 1131 int ret; 1132 1133 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1134 1135 return ret; 1136 } 1137 1138 return -ENOIOCTLCMD; 1139 } 1140 #endif 1141 1142 static unsigned int 1143 sg_poll(struct file *filp, poll_table * wait) 1144 { 1145 unsigned int res = 0; 1146 Sg_device *sdp; 1147 Sg_fd *sfp; 1148 Sg_request *srp; 1149 int count = 0; 1150 unsigned long iflags; 1151 1152 sfp = filp->private_data; 1153 if (!sfp) 1154 return POLLERR; 1155 sdp = sfp->parentdp; 1156 if (!sdp) 1157 return POLLERR; 1158 poll_wait(filp, &sfp->read_wait, wait); 1159 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1160 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1161 /* if any read waiting, flag it */ 1162 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1163 res = POLLIN | POLLRDNORM; 1164 ++count; 1165 } 1166 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1167 1168 if (sdp->detached) 1169 res |= POLLHUP; 1170 else if (!sfp->cmd_q) { 1171 if (0 == count) 1172 res |= POLLOUT | POLLWRNORM; 1173 } else if (count < SG_MAX_QUEUE) 1174 res |= POLLOUT | POLLWRNORM; 1175 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1176 sdp->disk->disk_name, (int) res)); 1177 return res; 1178 } 1179 1180 static int 1181 sg_fasync(int fd, struct file *filp, int mode) 1182 { 1183 Sg_device *sdp; 1184 Sg_fd *sfp; 1185 1186 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1187 return -ENXIO; 1188 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1189 sdp->disk->disk_name, mode)); 1190 1191 return fasync_helper(fd, filp, mode, &sfp->async_qp); 1192 } 1193 1194 static int 1195 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1196 { 1197 Sg_fd *sfp; 1198 unsigned long offset, len, sa; 1199 Sg_scatter_hold *rsv_schp; 1200 int k, length; 1201 1202 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1203 return VM_FAULT_SIGBUS; 1204 rsv_schp = &sfp->reserve; 1205 offset = vmf->pgoff << PAGE_SHIFT; 1206 if (offset >= rsv_schp->bufflen) 1207 return VM_FAULT_SIGBUS; 1208 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", 1209 offset, rsv_schp->k_use_sg)); 1210 sa = vma->vm_start; 1211 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1212 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1213 len = vma->vm_end - sa; 1214 len = (len < length) ? len : length; 1215 if (offset < len) { 1216 struct page *page = nth_page(rsv_schp->pages[k], 1217 offset >> PAGE_SHIFT); 1218 get_page(page); /* increment page count */ 1219 vmf->page = page; 1220 return 0; /* success */ 1221 } 1222 sa += len; 1223 offset -= len; 1224 } 1225 1226 return VM_FAULT_SIGBUS; 1227 } 1228 1229 static const struct vm_operations_struct sg_mmap_vm_ops = { 1230 .fault = sg_vma_fault, 1231 }; 1232 1233 static int 1234 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1235 { 1236 Sg_fd *sfp; 1237 unsigned long req_sz, len, sa; 1238 Sg_scatter_hold *rsv_schp; 1239 int k, length; 1240 1241 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1242 return -ENXIO; 1243 req_sz = vma->vm_end - vma->vm_start; 1244 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1245 (void *) vma->vm_start, (int) req_sz)); 1246 if (vma->vm_pgoff) 1247 return -EINVAL; /* want no offset */ 1248 rsv_schp = &sfp->reserve; 1249 if (req_sz > rsv_schp->bufflen) 1250 return -ENOMEM; /* cannot map more than reserved buffer */ 1251 1252 sa = vma->vm_start; 1253 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1254 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1255 len = vma->vm_end - sa; 1256 len = (len < length) ? len : length; 1257 sa += len; 1258 } 1259 1260 sfp->mmap_called = 1; 1261 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 1262 vma->vm_private_data = sfp; 1263 vma->vm_ops = &sg_mmap_vm_ops; 1264 return 0; 1265 } 1266 1267 static void sg_rq_end_io_usercontext(struct work_struct *work) 1268 { 1269 struct sg_request *srp = container_of(work, struct sg_request, ew.work); 1270 struct sg_fd *sfp = srp->parentfp; 1271 1272 sg_finish_rem_req(srp); 1273 kref_put(&sfp->f_ref, sg_remove_sfp); 1274 } 1275 1276 /* 1277 * This function is a "bottom half" handler that is called by the mid 1278 * level when a command is completed (or has failed). 1279 */ 1280 static void sg_rq_end_io(struct request *rq, int uptodate) 1281 { 1282 struct sg_request *srp = rq->end_io_data; 1283 Sg_device *sdp; 1284 Sg_fd *sfp; 1285 unsigned long iflags; 1286 unsigned int ms; 1287 char *sense; 1288 int result, resid, done = 1; 1289 1290 if (WARN_ON(srp->done != 0)) 1291 return; 1292 1293 sfp = srp->parentfp; 1294 if (WARN_ON(sfp == NULL)) 1295 return; 1296 1297 sdp = sfp->parentdp; 1298 if (unlikely(sdp->detached)) 1299 printk(KERN_INFO "sg_rq_end_io: device detached\n"); 1300 1301 sense = rq->sense; 1302 result = rq->errors; 1303 resid = rq->resid_len; 1304 1305 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1306 sdp->disk->disk_name, srp->header.pack_id, result)); 1307 srp->header.resid = resid; 1308 ms = jiffies_to_msecs(jiffies); 1309 srp->header.duration = (ms > srp->header.duration) ? 1310 (ms - srp->header.duration) : 0; 1311 if (0 != result) { 1312 struct scsi_sense_hdr sshdr; 1313 1314 srp->header.status = 0xff & result; 1315 srp->header.masked_status = status_byte(result); 1316 srp->header.msg_status = msg_byte(result); 1317 srp->header.host_status = host_byte(result); 1318 srp->header.driver_status = driver_byte(result); 1319 if ((sdp->sgdebug > 0) && 1320 ((CHECK_CONDITION == srp->header.masked_status) || 1321 (COMMAND_TERMINATED == srp->header.masked_status))) 1322 __scsi_print_sense("sg_cmd_done", sense, 1323 SCSI_SENSE_BUFFERSIZE); 1324 1325 /* Following if statement is a patch supplied by Eric Youngdale */ 1326 if (driver_byte(result) != 0 1327 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1328 && !scsi_sense_is_deferred(&sshdr) 1329 && sshdr.sense_key == UNIT_ATTENTION 1330 && sdp->device->removable) { 1331 /* Detected possible disc change. Set the bit - this */ 1332 /* may be used if there are filesystems using this device */ 1333 sdp->device->changed = 1; 1334 } 1335 } 1336 /* Rely on write phase to clean out srp status values, so no "else" */ 1337 1338 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1339 if (unlikely(srp->orphan)) { 1340 if (sfp->keep_orphan) 1341 srp->sg_io_owned = 0; 1342 else 1343 done = 0; 1344 } 1345 srp->done = done; 1346 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1347 1348 if (likely(done)) { 1349 /* Now wake up any sg_read() that is waiting for this 1350 * packet. 1351 */ 1352 wake_up_interruptible(&sfp->read_wait); 1353 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1354 kref_put(&sfp->f_ref, sg_remove_sfp); 1355 } else { 1356 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); 1357 schedule_work(&srp->ew.work); 1358 } 1359 } 1360 1361 static const struct file_operations sg_fops = { 1362 .owner = THIS_MODULE, 1363 .read = sg_read, 1364 .write = sg_write, 1365 .poll = sg_poll, 1366 .unlocked_ioctl = sg_ioctl, 1367 #ifdef CONFIG_COMPAT 1368 .compat_ioctl = sg_compat_ioctl, 1369 #endif 1370 .open = sg_open, 1371 .mmap = sg_mmap, 1372 .release = sg_release, 1373 .fasync = sg_fasync, 1374 .llseek = no_llseek, 1375 }; 1376 1377 static struct class *sg_sysfs_class; 1378 1379 static int sg_sysfs_valid = 0; 1380 1381 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1382 { 1383 struct request_queue *q = scsidp->request_queue; 1384 Sg_device *sdp; 1385 unsigned long iflags; 1386 int error; 1387 u32 k; 1388 1389 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1390 if (!sdp) { 1391 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1392 return ERR_PTR(-ENOMEM); 1393 } 1394 1395 idr_preload(GFP_KERNEL); 1396 write_lock_irqsave(&sg_index_lock, iflags); 1397 1398 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT); 1399 if (error < 0) { 1400 if (error == -ENOSPC) { 1401 sdev_printk(KERN_WARNING, scsidp, 1402 "Unable to attach sg device type=%d, minor number exceeds %d\n", 1403 scsidp->type, SG_MAX_DEVS - 1); 1404 error = -ENODEV; 1405 } else { 1406 printk(KERN_WARNING 1407 "idr allocation Sg_device failure: %d\n", error); 1408 } 1409 goto out_unlock; 1410 } 1411 k = error; 1412 1413 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1414 sprintf(disk->disk_name, "sg%d", k); 1415 disk->first_minor = k; 1416 sdp->disk = disk; 1417 sdp->device = scsidp; 1418 INIT_LIST_HEAD(&sdp->sfds); 1419 init_waitqueue_head(&sdp->o_excl_wait); 1420 sdp->sg_tablesize = queue_max_segments(q); 1421 sdp->index = k; 1422 kref_init(&sdp->d_ref); 1423 error = 0; 1424 1425 out_unlock: 1426 write_unlock_irqrestore(&sg_index_lock, iflags); 1427 idr_preload_end(); 1428 1429 if (error) { 1430 kfree(sdp); 1431 return ERR_PTR(error); 1432 } 1433 return sdp; 1434 } 1435 1436 static int 1437 sg_add(struct device *cl_dev, struct class_interface *cl_intf) 1438 { 1439 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1440 struct gendisk *disk; 1441 Sg_device *sdp = NULL; 1442 struct cdev * cdev = NULL; 1443 int error; 1444 unsigned long iflags; 1445 1446 disk = alloc_disk(1); 1447 if (!disk) { 1448 printk(KERN_WARNING "alloc_disk failed\n"); 1449 return -ENOMEM; 1450 } 1451 disk->major = SCSI_GENERIC_MAJOR; 1452 1453 error = -ENOMEM; 1454 cdev = cdev_alloc(); 1455 if (!cdev) { 1456 printk(KERN_WARNING "cdev_alloc failed\n"); 1457 goto out; 1458 } 1459 cdev->owner = THIS_MODULE; 1460 cdev->ops = &sg_fops; 1461 1462 sdp = sg_alloc(disk, scsidp); 1463 if (IS_ERR(sdp)) { 1464 printk(KERN_WARNING "sg_alloc failed\n"); 1465 error = PTR_ERR(sdp); 1466 goto out; 1467 } 1468 1469 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); 1470 if (error) 1471 goto cdev_add_err; 1472 1473 sdp->cdev = cdev; 1474 if (sg_sysfs_valid) { 1475 struct device *sg_class_member; 1476 1477 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, 1478 MKDEV(SCSI_GENERIC_MAJOR, 1479 sdp->index), 1480 sdp, "%s", disk->disk_name); 1481 if (IS_ERR(sg_class_member)) { 1482 printk(KERN_ERR "sg_add: " 1483 "device_create failed\n"); 1484 error = PTR_ERR(sg_class_member); 1485 goto cdev_add_err; 1486 } 1487 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1488 &sg_class_member->kobj, "generic"); 1489 if (error) 1490 printk(KERN_ERR "sg_add: unable to make symlink " 1491 "'generic' back to sg%d\n", sdp->index); 1492 } else 1493 printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); 1494 1495 sdev_printk(KERN_NOTICE, scsidp, 1496 "Attached scsi generic sg%d type %d\n", sdp->index, 1497 scsidp->type); 1498 1499 dev_set_drvdata(cl_dev, sdp); 1500 1501 return 0; 1502 1503 cdev_add_err: 1504 write_lock_irqsave(&sg_index_lock, iflags); 1505 idr_remove(&sg_index_idr, sdp->index); 1506 write_unlock_irqrestore(&sg_index_lock, iflags); 1507 kfree(sdp); 1508 1509 out: 1510 put_disk(disk); 1511 if (cdev) 1512 cdev_del(cdev); 1513 return error; 1514 } 1515 1516 static void sg_device_destroy(struct kref *kref) 1517 { 1518 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); 1519 unsigned long flags; 1520 1521 /* CAUTION! Note that the device can still be found via idr_find() 1522 * even though the refcount is 0. Therefore, do idr_remove() BEFORE 1523 * any other cleanup. 1524 */ 1525 1526 write_lock_irqsave(&sg_index_lock, flags); 1527 idr_remove(&sg_index_idr, sdp->index); 1528 write_unlock_irqrestore(&sg_index_lock, flags); 1529 1530 SCSI_LOG_TIMEOUT(3, 1531 printk("sg_device_destroy: %s\n", 1532 sdp->disk->disk_name)); 1533 1534 put_disk(sdp->disk); 1535 kfree(sdp); 1536 } 1537 1538 static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf) 1539 { 1540 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1541 Sg_device *sdp = dev_get_drvdata(cl_dev); 1542 unsigned long iflags; 1543 Sg_fd *sfp; 1544 1545 if (!sdp || sdp->detached) 1546 return; 1547 1548 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name)); 1549 1550 /* Need a write lock to set sdp->detached. */ 1551 write_lock_irqsave(&sg_index_lock, iflags); 1552 sdp->detached = 1; 1553 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { 1554 wake_up_interruptible(&sfp->read_wait); 1555 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); 1556 } 1557 write_unlock_irqrestore(&sg_index_lock, iflags); 1558 1559 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1560 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); 1561 cdev_del(sdp->cdev); 1562 sdp->cdev = NULL; 1563 1564 sg_put_dev(sdp); 1565 } 1566 1567 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1568 module_param_named(def_reserved_size, def_reserved_size, int, 1569 S_IRUGO | S_IWUSR); 1570 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1571 1572 MODULE_AUTHOR("Douglas Gilbert"); 1573 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1574 MODULE_LICENSE("GPL"); 1575 MODULE_VERSION(SG_VERSION_STR); 1576 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1577 1578 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1579 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1580 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1581 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1582 1583 static int __init 1584 init_sg(void) 1585 { 1586 int rc; 1587 1588 if (scatter_elem_sz < PAGE_SIZE) { 1589 scatter_elem_sz = PAGE_SIZE; 1590 scatter_elem_sz_prev = scatter_elem_sz; 1591 } 1592 if (def_reserved_size >= 0) 1593 sg_big_buff = def_reserved_size; 1594 else 1595 def_reserved_size = sg_big_buff; 1596 1597 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1598 SG_MAX_DEVS, "sg"); 1599 if (rc) 1600 return rc; 1601 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1602 if ( IS_ERR(sg_sysfs_class) ) { 1603 rc = PTR_ERR(sg_sysfs_class); 1604 goto err_out; 1605 } 1606 sg_sysfs_valid = 1; 1607 rc = scsi_register_interface(&sg_interface); 1608 if (0 == rc) { 1609 #ifdef CONFIG_SCSI_PROC_FS 1610 sg_proc_init(); 1611 #endif /* CONFIG_SCSI_PROC_FS */ 1612 return 0; 1613 } 1614 class_destroy(sg_sysfs_class); 1615 err_out: 1616 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1617 return rc; 1618 } 1619 1620 static void __exit 1621 exit_sg(void) 1622 { 1623 #ifdef CONFIG_SCSI_PROC_FS 1624 sg_proc_cleanup(); 1625 #endif /* CONFIG_SCSI_PROC_FS */ 1626 scsi_unregister_interface(&sg_interface); 1627 class_destroy(sg_sysfs_class); 1628 sg_sysfs_valid = 0; 1629 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1630 SG_MAX_DEVS); 1631 idr_destroy(&sg_index_idr); 1632 } 1633 1634 static int sg_start_req(Sg_request *srp, unsigned char *cmd) 1635 { 1636 int res; 1637 struct request *rq; 1638 Sg_fd *sfp = srp->parentfp; 1639 sg_io_hdr_t *hp = &srp->header; 1640 int dxfer_len = (int) hp->dxfer_len; 1641 int dxfer_dir = hp->dxfer_direction; 1642 unsigned int iov_count = hp->iovec_count; 1643 Sg_scatter_hold *req_schp = &srp->data; 1644 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1645 struct request_queue *q = sfp->parentdp->device->request_queue; 1646 struct rq_map_data *md, map_data; 1647 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; 1648 1649 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n", 1650 dxfer_len)); 1651 1652 rq = blk_get_request(q, rw, GFP_ATOMIC); 1653 if (!rq) 1654 return -ENOMEM; 1655 1656 memcpy(rq->cmd, cmd, hp->cmd_len); 1657 1658 rq->cmd_len = hp->cmd_len; 1659 rq->cmd_type = REQ_TYPE_BLOCK_PC; 1660 1661 srp->rq = rq; 1662 rq->end_io_data = srp; 1663 rq->sense = srp->sense_b; 1664 rq->retries = SG_DEFAULT_RETRIES; 1665 1666 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1667 return 0; 1668 1669 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && 1670 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && 1671 !sfp->parentdp->device->host->unchecked_isa_dma && 1672 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) 1673 md = NULL; 1674 else 1675 md = &map_data; 1676 1677 if (md) { 1678 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) 1679 sg_link_reserve(sfp, srp, dxfer_len); 1680 else { 1681 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1682 if (res) 1683 return res; 1684 } 1685 1686 md->pages = req_schp->pages; 1687 md->page_order = req_schp->page_order; 1688 md->nr_entries = req_schp->k_use_sg; 1689 md->offset = 0; 1690 md->null_mapped = hp->dxferp ? 0 : 1; 1691 if (dxfer_dir == SG_DXFER_TO_FROM_DEV) 1692 md->from_user = 1; 1693 else 1694 md->from_user = 0; 1695 } 1696 1697 if (iov_count) { 1698 int len, size = sizeof(struct sg_iovec) * iov_count; 1699 struct iovec *iov; 1700 1701 iov = memdup_user(hp->dxferp, size); 1702 if (IS_ERR(iov)) 1703 return PTR_ERR(iov); 1704 1705 len = iov_length(iov, iov_count); 1706 if (hp->dxfer_len < len) { 1707 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len); 1708 len = hp->dxfer_len; 1709 } 1710 1711 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov, 1712 iov_count, 1713 len, GFP_ATOMIC); 1714 kfree(iov); 1715 } else 1716 res = blk_rq_map_user(q, rq, md, hp->dxferp, 1717 hp->dxfer_len, GFP_ATOMIC); 1718 1719 if (!res) { 1720 srp->bio = rq->bio; 1721 1722 if (!md) { 1723 req_schp->dio_in_use = 1; 1724 hp->info |= SG_INFO_DIRECT_IO; 1725 } 1726 } 1727 return res; 1728 } 1729 1730 static int sg_finish_rem_req(Sg_request * srp) 1731 { 1732 int ret = 0; 1733 1734 Sg_fd *sfp = srp->parentfp; 1735 Sg_scatter_hold *req_schp = &srp->data; 1736 1737 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1738 if (srp->rq) { 1739 if (srp->bio) 1740 ret = blk_rq_unmap_user(srp->bio); 1741 1742 blk_put_request(srp->rq); 1743 } 1744 1745 if (srp->res_used) 1746 sg_unlink_reserve(sfp, srp); 1747 else 1748 sg_remove_scat(req_schp); 1749 1750 sg_remove_request(sfp, srp); 1751 1752 return ret; 1753 } 1754 1755 static int 1756 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1757 { 1758 int sg_bufflen = tablesize * sizeof(struct page *); 1759 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1760 1761 schp->pages = kzalloc(sg_bufflen, gfp_flags); 1762 if (!schp->pages) 1763 return -ENOMEM; 1764 schp->sglist_len = sg_bufflen; 1765 return tablesize; /* number of scat_gath elements allocated */ 1766 } 1767 1768 static int 1769 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1770 { 1771 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; 1772 int sg_tablesize = sfp->parentdp->sg_tablesize; 1773 int blk_size = buff_size, order; 1774 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 1775 1776 if (blk_size < 0) 1777 return -EFAULT; 1778 if (0 == blk_size) 1779 ++blk_size; /* don't know why */ 1780 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1781 blk_size = ALIGN(blk_size, SG_SECTOR_SZ); 1782 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1783 buff_size, blk_size)); 1784 1785 /* N.B. ret_sz carried into this block ... */ 1786 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1787 if (mx_sc_elems < 0) 1788 return mx_sc_elems; /* most likely -ENOMEM */ 1789 1790 num = scatter_elem_sz; 1791 if (unlikely(num != scatter_elem_sz_prev)) { 1792 if (num < PAGE_SIZE) { 1793 scatter_elem_sz = PAGE_SIZE; 1794 scatter_elem_sz_prev = PAGE_SIZE; 1795 } else 1796 scatter_elem_sz_prev = num; 1797 } 1798 1799 if (sfp->low_dma) 1800 gfp_mask |= GFP_DMA; 1801 1802 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1803 gfp_mask |= __GFP_ZERO; 1804 1805 order = get_order(num); 1806 retry: 1807 ret_sz = 1 << (PAGE_SHIFT + order); 1808 1809 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; 1810 k++, rem_sz -= ret_sz) { 1811 1812 num = (rem_sz > scatter_elem_sz_prev) ? 1813 scatter_elem_sz_prev : rem_sz; 1814 1815 schp->pages[k] = alloc_pages(gfp_mask, order); 1816 if (!schp->pages[k]) 1817 goto out; 1818 1819 if (num == scatter_elem_sz_prev) { 1820 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1821 scatter_elem_sz = ret_sz; 1822 scatter_elem_sz_prev = ret_sz; 1823 } 1824 } 1825 1826 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " 1827 "ret_sz=%d\n", k, num, ret_sz)); 1828 } /* end of for loop */ 1829 1830 schp->page_order = order; 1831 schp->k_use_sg = k; 1832 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " 1833 "rem_sz=%d\n", k, rem_sz)); 1834 1835 schp->bufflen = blk_size; 1836 if (rem_sz > 0) /* must have failed */ 1837 return -ENOMEM; 1838 return 0; 1839 out: 1840 for (i = 0; i < k; i++) 1841 __free_pages(schp->pages[i], order); 1842 1843 if (--order >= 0) 1844 goto retry; 1845 1846 return -ENOMEM; 1847 } 1848 1849 static void 1850 sg_remove_scat(Sg_scatter_hold * schp) 1851 { 1852 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1853 if (schp->pages && schp->sglist_len > 0) { 1854 if (!schp->dio_in_use) { 1855 int k; 1856 1857 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1858 SCSI_LOG_TIMEOUT(5, printk( 1859 "sg_remove_scat: k=%d, pg=0x%p\n", 1860 k, schp->pages[k])); 1861 __free_pages(schp->pages[k], schp->page_order); 1862 } 1863 1864 kfree(schp->pages); 1865 } 1866 } 1867 memset(schp, 0, sizeof (*schp)); 1868 } 1869 1870 static int 1871 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 1872 { 1873 Sg_scatter_hold *schp = &srp->data; 1874 int k, num; 1875 1876 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 1877 num_read_xfer)); 1878 if ((!outp) || (num_read_xfer <= 0)) 1879 return 0; 1880 1881 num = 1 << (PAGE_SHIFT + schp->page_order); 1882 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1883 if (num > num_read_xfer) { 1884 if (__copy_to_user(outp, page_address(schp->pages[k]), 1885 num_read_xfer)) 1886 return -EFAULT; 1887 break; 1888 } else { 1889 if (__copy_to_user(outp, page_address(schp->pages[k]), 1890 num)) 1891 return -EFAULT; 1892 num_read_xfer -= num; 1893 if (num_read_xfer <= 0) 1894 break; 1895 outp += num; 1896 } 1897 } 1898 1899 return 0; 1900 } 1901 1902 static void 1903 sg_build_reserve(Sg_fd * sfp, int req_size) 1904 { 1905 Sg_scatter_hold *schp = &sfp->reserve; 1906 1907 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 1908 do { 1909 if (req_size < PAGE_SIZE) 1910 req_size = PAGE_SIZE; 1911 if (0 == sg_build_indirect(schp, sfp, req_size)) 1912 return; 1913 else 1914 sg_remove_scat(schp); 1915 req_size >>= 1; /* divide by 2 */ 1916 } while (req_size > (PAGE_SIZE / 2)); 1917 } 1918 1919 static void 1920 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 1921 { 1922 Sg_scatter_hold *req_schp = &srp->data; 1923 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1924 int k, num, rem; 1925 1926 srp->res_used = 1; 1927 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 1928 rem = size; 1929 1930 num = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1931 for (k = 0; k < rsv_schp->k_use_sg; k++) { 1932 if (rem <= num) { 1933 req_schp->k_use_sg = k + 1; 1934 req_schp->sglist_len = rsv_schp->sglist_len; 1935 req_schp->pages = rsv_schp->pages; 1936 1937 req_schp->bufflen = size; 1938 req_schp->page_order = rsv_schp->page_order; 1939 break; 1940 } else 1941 rem -= num; 1942 } 1943 1944 if (k >= rsv_schp->k_use_sg) 1945 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 1946 } 1947 1948 static void 1949 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 1950 { 1951 Sg_scatter_hold *req_schp = &srp->data; 1952 1953 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 1954 (int) req_schp->k_use_sg)); 1955 req_schp->k_use_sg = 0; 1956 req_schp->bufflen = 0; 1957 req_schp->pages = NULL; 1958 req_schp->page_order = 0; 1959 req_schp->sglist_len = 0; 1960 sfp->save_scat_len = 0; 1961 srp->res_used = 0; 1962 } 1963 1964 static Sg_request * 1965 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 1966 { 1967 Sg_request *resp; 1968 unsigned long iflags; 1969 1970 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1971 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 1972 /* look for requests that are ready + not SG_IO owned */ 1973 if ((1 == resp->done) && (!resp->sg_io_owned) && 1974 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 1975 resp->done = 2; /* guard against other readers */ 1976 break; 1977 } 1978 } 1979 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1980 return resp; 1981 } 1982 1983 /* always adds to end of list */ 1984 static Sg_request * 1985 sg_add_request(Sg_fd * sfp) 1986 { 1987 int k; 1988 unsigned long iflags; 1989 Sg_request *resp; 1990 Sg_request *rp = sfp->req_arr; 1991 1992 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1993 resp = sfp->headrp; 1994 if (!resp) { 1995 memset(rp, 0, sizeof (Sg_request)); 1996 rp->parentfp = sfp; 1997 resp = rp; 1998 sfp->headrp = resp; 1999 } else { 2000 if (0 == sfp->cmd_q) 2001 resp = NULL; /* command queuing disallowed */ 2002 else { 2003 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2004 if (!rp->parentfp) 2005 break; 2006 } 2007 if (k < SG_MAX_QUEUE) { 2008 memset(rp, 0, sizeof (Sg_request)); 2009 rp->parentfp = sfp; 2010 while (resp->nextrp) 2011 resp = resp->nextrp; 2012 resp->nextrp = rp; 2013 resp = rp; 2014 } else 2015 resp = NULL; 2016 } 2017 } 2018 if (resp) { 2019 resp->nextrp = NULL; 2020 resp->header.duration = jiffies_to_msecs(jiffies); 2021 } 2022 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2023 return resp; 2024 } 2025 2026 /* Return of 1 for found; 0 for not found */ 2027 static int 2028 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2029 { 2030 Sg_request *prev_rp; 2031 Sg_request *rp; 2032 unsigned long iflags; 2033 int res = 0; 2034 2035 if ((!sfp) || (!srp) || (!sfp->headrp)) 2036 return res; 2037 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2038 prev_rp = sfp->headrp; 2039 if (srp == prev_rp) { 2040 sfp->headrp = prev_rp->nextrp; 2041 prev_rp->parentfp = NULL; 2042 res = 1; 2043 } else { 2044 while ((rp = prev_rp->nextrp)) { 2045 if (srp == rp) { 2046 prev_rp->nextrp = rp->nextrp; 2047 rp->parentfp = NULL; 2048 res = 1; 2049 break; 2050 } 2051 prev_rp = rp; 2052 } 2053 } 2054 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2055 return res; 2056 } 2057 2058 static Sg_fd * 2059 sg_add_sfp(Sg_device * sdp, int dev) 2060 { 2061 Sg_fd *sfp; 2062 unsigned long iflags; 2063 int bufflen; 2064 2065 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2066 if (!sfp) 2067 return NULL; 2068 2069 init_waitqueue_head(&sfp->read_wait); 2070 rwlock_init(&sfp->rq_list_lock); 2071 2072 kref_init(&sfp->f_ref); 2073 sfp->timeout = SG_DEFAULT_TIMEOUT; 2074 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2075 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2076 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2077 sdp->device->host->unchecked_isa_dma : 1; 2078 sfp->cmd_q = SG_DEF_COMMAND_Q; 2079 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2080 sfp->parentdp = sdp; 2081 write_lock_irqsave(&sg_index_lock, iflags); 2082 list_add_tail(&sfp->sfd_siblings, &sdp->sfds); 2083 write_unlock_irqrestore(&sg_index_lock, iflags); 2084 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2085 if (unlikely(sg_big_buff != def_reserved_size)) 2086 sg_big_buff = def_reserved_size; 2087 2088 bufflen = min_t(int, sg_big_buff, 2089 queue_max_sectors(sdp->device->request_queue) * 512); 2090 sg_build_reserve(sfp, bufflen); 2091 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2092 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2093 2094 kref_get(&sdp->d_ref); 2095 __module_get(THIS_MODULE); 2096 return sfp; 2097 } 2098 2099 static void sg_remove_sfp_usercontext(struct work_struct *work) 2100 { 2101 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); 2102 struct sg_device *sdp = sfp->parentdp; 2103 2104 /* Cleanup any responses which were never read(). */ 2105 while (sfp->headrp) 2106 sg_finish_rem_req(sfp->headrp); 2107 2108 if (sfp->reserve.bufflen > 0) { 2109 SCSI_LOG_TIMEOUT(6, 2110 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2111 (int) sfp->reserve.bufflen, 2112 (int) sfp->reserve.k_use_sg)); 2113 sg_remove_scat(&sfp->reserve); 2114 } 2115 2116 SCSI_LOG_TIMEOUT(6, 2117 printk("sg_remove_sfp: %s, sfp=0x%p\n", 2118 sdp->disk->disk_name, 2119 sfp)); 2120 kfree(sfp); 2121 2122 scsi_device_put(sdp->device); 2123 sg_put_dev(sdp); 2124 module_put(THIS_MODULE); 2125 } 2126 2127 static void sg_remove_sfp(struct kref *kref) 2128 { 2129 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); 2130 struct sg_device *sdp = sfp->parentdp; 2131 unsigned long iflags; 2132 2133 write_lock_irqsave(&sg_index_lock, iflags); 2134 list_del(&sfp->sfd_siblings); 2135 write_unlock_irqrestore(&sg_index_lock, iflags); 2136 wake_up_interruptible(&sdp->o_excl_wait); 2137 2138 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); 2139 schedule_work(&sfp->ew.work); 2140 } 2141 2142 static int 2143 sg_res_in_use(Sg_fd * sfp) 2144 { 2145 const Sg_request *srp; 2146 unsigned long iflags; 2147 2148 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2149 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2150 if (srp->res_used) 2151 break; 2152 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2153 return srp ? 1 : 0; 2154 } 2155 2156 #ifdef CONFIG_SCSI_PROC_FS 2157 static int 2158 sg_idr_max_id(int id, void *p, void *data) 2159 { 2160 int *k = data; 2161 2162 if (*k < id) 2163 *k = id; 2164 2165 return 0; 2166 } 2167 2168 static int 2169 sg_last_dev(void) 2170 { 2171 int k = -1; 2172 unsigned long iflags; 2173 2174 read_lock_irqsave(&sg_index_lock, iflags); 2175 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2176 read_unlock_irqrestore(&sg_index_lock, iflags); 2177 return k + 1; /* origin 1 */ 2178 } 2179 #endif 2180 2181 /* must be called with sg_index_lock held */ 2182 static Sg_device *sg_lookup_dev(int dev) 2183 { 2184 return idr_find(&sg_index_idr, dev); 2185 } 2186 2187 static Sg_device *sg_get_dev(int dev) 2188 { 2189 struct sg_device *sdp; 2190 unsigned long flags; 2191 2192 read_lock_irqsave(&sg_index_lock, flags); 2193 sdp = sg_lookup_dev(dev); 2194 if (!sdp) 2195 sdp = ERR_PTR(-ENXIO); 2196 else if (sdp->detached) { 2197 /* If sdp->detached, then the refcount may already be 0, in 2198 * which case it would be a bug to do kref_get(). 2199 */ 2200 sdp = ERR_PTR(-ENODEV); 2201 } else 2202 kref_get(&sdp->d_ref); 2203 read_unlock_irqrestore(&sg_index_lock, flags); 2204 2205 return sdp; 2206 } 2207 2208 static void sg_put_dev(struct sg_device *sdp) 2209 { 2210 kref_put(&sdp->d_ref, sg_device_destroy); 2211 } 2212 2213 #ifdef CONFIG_SCSI_PROC_FS 2214 2215 static struct proc_dir_entry *sg_proc_sgp = NULL; 2216 2217 static char sg_proc_sg_dirname[] = "scsi/sg"; 2218 2219 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2220 2221 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2222 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2223 size_t count, loff_t *off); 2224 static const struct file_operations adio_fops = { 2225 .owner = THIS_MODULE, 2226 .open = sg_proc_single_open_adio, 2227 .read = seq_read, 2228 .llseek = seq_lseek, 2229 .write = sg_proc_write_adio, 2230 .release = single_release, 2231 }; 2232 2233 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2234 static ssize_t sg_proc_write_dressz(struct file *filp, 2235 const char __user *buffer, size_t count, loff_t *off); 2236 static const struct file_operations dressz_fops = { 2237 .owner = THIS_MODULE, 2238 .open = sg_proc_single_open_dressz, 2239 .read = seq_read, 2240 .llseek = seq_lseek, 2241 .write = sg_proc_write_dressz, 2242 .release = single_release, 2243 }; 2244 2245 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2246 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2247 static const struct file_operations version_fops = { 2248 .owner = THIS_MODULE, 2249 .open = sg_proc_single_open_version, 2250 .read = seq_read, 2251 .llseek = seq_lseek, 2252 .release = single_release, 2253 }; 2254 2255 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2256 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2257 static const struct file_operations devhdr_fops = { 2258 .owner = THIS_MODULE, 2259 .open = sg_proc_single_open_devhdr, 2260 .read = seq_read, 2261 .llseek = seq_lseek, 2262 .release = single_release, 2263 }; 2264 2265 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2266 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2267 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2268 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2269 static void dev_seq_stop(struct seq_file *s, void *v); 2270 static const struct file_operations dev_fops = { 2271 .owner = THIS_MODULE, 2272 .open = sg_proc_open_dev, 2273 .read = seq_read, 2274 .llseek = seq_lseek, 2275 .release = seq_release, 2276 }; 2277 static const struct seq_operations dev_seq_ops = { 2278 .start = dev_seq_start, 2279 .next = dev_seq_next, 2280 .stop = dev_seq_stop, 2281 .show = sg_proc_seq_show_dev, 2282 }; 2283 2284 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2285 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2286 static const struct file_operations devstrs_fops = { 2287 .owner = THIS_MODULE, 2288 .open = sg_proc_open_devstrs, 2289 .read = seq_read, 2290 .llseek = seq_lseek, 2291 .release = seq_release, 2292 }; 2293 static const struct seq_operations devstrs_seq_ops = { 2294 .start = dev_seq_start, 2295 .next = dev_seq_next, 2296 .stop = dev_seq_stop, 2297 .show = sg_proc_seq_show_devstrs, 2298 }; 2299 2300 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2301 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2302 static const struct file_operations debug_fops = { 2303 .owner = THIS_MODULE, 2304 .open = sg_proc_open_debug, 2305 .read = seq_read, 2306 .llseek = seq_lseek, 2307 .release = seq_release, 2308 }; 2309 static const struct seq_operations debug_seq_ops = { 2310 .start = dev_seq_start, 2311 .next = dev_seq_next, 2312 .stop = dev_seq_stop, 2313 .show = sg_proc_seq_show_debug, 2314 }; 2315 2316 2317 struct sg_proc_leaf { 2318 const char * name; 2319 const struct file_operations * fops; 2320 }; 2321 2322 static const struct sg_proc_leaf sg_proc_leaf_arr[] = { 2323 {"allow_dio", &adio_fops}, 2324 {"debug", &debug_fops}, 2325 {"def_reserved_size", &dressz_fops}, 2326 {"device_hdr", &devhdr_fops}, 2327 {"devices", &dev_fops}, 2328 {"device_strs", &devstrs_fops}, 2329 {"version", &version_fops} 2330 }; 2331 2332 static int 2333 sg_proc_init(void) 2334 { 2335 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2336 int k; 2337 2338 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2339 if (!sg_proc_sgp) 2340 return 1; 2341 for (k = 0; k < num_leaves; ++k) { 2342 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k]; 2343 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2344 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); 2345 } 2346 return 0; 2347 } 2348 2349 static void 2350 sg_proc_cleanup(void) 2351 { 2352 int k; 2353 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2354 2355 if (!sg_proc_sgp) 2356 return; 2357 for (k = 0; k < num_leaves; ++k) 2358 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2359 remove_proc_entry(sg_proc_sg_dirname, NULL); 2360 } 2361 2362 2363 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2364 { 2365 seq_printf(s, "%d\n", *((int *)s->private)); 2366 return 0; 2367 } 2368 2369 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2370 { 2371 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2372 } 2373 2374 static ssize_t 2375 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2376 size_t count, loff_t *off) 2377 { 2378 int err; 2379 unsigned long num; 2380 2381 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2382 return -EACCES; 2383 err = kstrtoul_from_user(buffer, count, 0, &num); 2384 if (err) 2385 return err; 2386 sg_allow_dio = num ? 1 : 0; 2387 return count; 2388 } 2389 2390 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2391 { 2392 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2393 } 2394 2395 static ssize_t 2396 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2397 size_t count, loff_t *off) 2398 { 2399 int err; 2400 unsigned long k = ULONG_MAX; 2401 2402 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2403 return -EACCES; 2404 2405 err = kstrtoul_from_user(buffer, count, 0, &k); 2406 if (err) 2407 return err; 2408 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2409 sg_big_buff = k; 2410 return count; 2411 } 2412 return -ERANGE; 2413 } 2414 2415 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2416 { 2417 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2418 sg_version_date); 2419 return 0; 2420 } 2421 2422 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2423 { 2424 return single_open(file, sg_proc_seq_show_version, NULL); 2425 } 2426 2427 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2428 { 2429 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2430 "online\n"); 2431 return 0; 2432 } 2433 2434 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2435 { 2436 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2437 } 2438 2439 struct sg_proc_deviter { 2440 loff_t index; 2441 size_t max; 2442 }; 2443 2444 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2445 { 2446 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2447 2448 s->private = it; 2449 if (! it) 2450 return NULL; 2451 2452 it->index = *pos; 2453 it->max = sg_last_dev(); 2454 if (it->index >= it->max) 2455 return NULL; 2456 return it; 2457 } 2458 2459 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2460 { 2461 struct sg_proc_deviter * it = s->private; 2462 2463 *pos = ++it->index; 2464 return (it->index < it->max) ? it : NULL; 2465 } 2466 2467 static void dev_seq_stop(struct seq_file *s, void *v) 2468 { 2469 kfree(s->private); 2470 } 2471 2472 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2473 { 2474 return seq_open(file, &dev_seq_ops); 2475 } 2476 2477 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2478 { 2479 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2480 Sg_device *sdp; 2481 struct scsi_device *scsidp; 2482 unsigned long iflags; 2483 2484 read_lock_irqsave(&sg_index_lock, iflags); 2485 sdp = it ? sg_lookup_dev(it->index) : NULL; 2486 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2487 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2488 scsidp->host->host_no, scsidp->channel, 2489 scsidp->id, scsidp->lun, (int) scsidp->type, 2490 1, 2491 (int) scsidp->queue_depth, 2492 (int) scsidp->device_busy, 2493 (int) scsi_device_online(scsidp)); 2494 else 2495 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2496 read_unlock_irqrestore(&sg_index_lock, iflags); 2497 return 0; 2498 } 2499 2500 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2501 { 2502 return seq_open(file, &devstrs_seq_ops); 2503 } 2504 2505 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2506 { 2507 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2508 Sg_device *sdp; 2509 struct scsi_device *scsidp; 2510 unsigned long iflags; 2511 2512 read_lock_irqsave(&sg_index_lock, iflags); 2513 sdp = it ? sg_lookup_dev(it->index) : NULL; 2514 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2515 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2516 scsidp->vendor, scsidp->model, scsidp->rev); 2517 else 2518 seq_printf(s, "<no active device>\n"); 2519 read_unlock_irqrestore(&sg_index_lock, iflags); 2520 return 0; 2521 } 2522 2523 /* must be called while holding sg_index_lock */ 2524 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2525 { 2526 int k, m, new_interface, blen, usg; 2527 Sg_request *srp; 2528 Sg_fd *fp; 2529 const sg_io_hdr_t *hp; 2530 const char * cp; 2531 unsigned int ms; 2532 2533 k = 0; 2534 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { 2535 k++; 2536 read_lock(&fp->rq_list_lock); /* irqs already disabled */ 2537 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2538 "(res)sgat=%d low_dma=%d\n", k, 2539 jiffies_to_msecs(fp->timeout), 2540 fp->reserve.bufflen, 2541 (int) fp->reserve.k_use_sg, 2542 (int) fp->low_dma); 2543 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n", 2544 (int) fp->cmd_q, (int) fp->force_packid, 2545 (int) fp->keep_orphan); 2546 for (m = 0, srp = fp->headrp; 2547 srp != NULL; 2548 ++m, srp = srp->nextrp) { 2549 hp = &srp->header; 2550 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2551 if (srp->res_used) { 2552 if (new_interface && 2553 (SG_FLAG_MMAP_IO & hp->flags)) 2554 cp = " mmap>> "; 2555 else 2556 cp = " rb>> "; 2557 } else { 2558 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2559 cp = " dio>> "; 2560 else 2561 cp = " "; 2562 } 2563 seq_printf(s, cp); 2564 blen = srp->data.bufflen; 2565 usg = srp->data.k_use_sg; 2566 seq_printf(s, srp->done ? 2567 ((1 == srp->done) ? "rcv:" : "fin:") 2568 : "act:"); 2569 seq_printf(s, " id=%d blen=%d", 2570 srp->header.pack_id, blen); 2571 if (srp->done) 2572 seq_printf(s, " dur=%d", hp->duration); 2573 else { 2574 ms = jiffies_to_msecs(jiffies); 2575 seq_printf(s, " t_o/elap=%d/%d", 2576 (new_interface ? hp->timeout : 2577 jiffies_to_msecs(fp->timeout)), 2578 (ms > hp->duration ? ms - hp->duration : 0)); 2579 } 2580 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2581 (int) srp->data.cmd_opcode); 2582 } 2583 if (0 == m) 2584 seq_printf(s, " No requests active\n"); 2585 read_unlock(&fp->rq_list_lock); 2586 } 2587 } 2588 2589 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2590 { 2591 return seq_open(file, &debug_seq_ops); 2592 } 2593 2594 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2595 { 2596 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2597 Sg_device *sdp; 2598 unsigned long iflags; 2599 2600 if (it && (0 == it->index)) { 2601 seq_printf(s, "max_active_device=%d(origin 1)\n", 2602 (int)it->max); 2603 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2604 } 2605 2606 read_lock_irqsave(&sg_index_lock, iflags); 2607 sdp = it ? sg_lookup_dev(it->index) : NULL; 2608 if (sdp && !list_empty(&sdp->sfds)) { 2609 struct scsi_device *scsidp = sdp->device; 2610 2611 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); 2612 if (sdp->detached) 2613 seq_printf(s, "detached pending close "); 2614 else 2615 seq_printf 2616 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2617 scsidp->host->host_no, 2618 scsidp->channel, scsidp->id, 2619 scsidp->lun, 2620 scsidp->host->hostt->emulated); 2621 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2622 sdp->sg_tablesize, get_exclude(sdp)); 2623 sg_proc_debug_helper(s, sdp); 2624 } 2625 read_unlock_irqrestore(&sg_index_lock, iflags); 2626 return 0; 2627 } 2628 2629 #endif /* CONFIG_SCSI_PROC_FS */ 2630 2631 module_init(init_sg); 2632 module_exit(exit_sg); 2633