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; 213 214 if (sfp->parentdp->device->type == TYPE_SCANNER) 215 return 0; 216 217 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); 218 } 219 220 static int 221 sg_open(struct inode *inode, struct file *filp) 222 { 223 int dev = iminor(inode); 224 int flags = filp->f_flags; 225 struct request_queue *q; 226 Sg_device *sdp; 227 Sg_fd *sfp; 228 int res; 229 int retval; 230 231 lock_kernel(); 232 nonseekable_open(inode, filp); 233 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 234 sdp = sg_get_dev(dev); 235 if (IS_ERR(sdp)) { 236 retval = PTR_ERR(sdp); 237 sdp = NULL; 238 goto sg_put; 239 } 240 241 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 242 /* Prevent the device driver from vanishing while we sleep */ 243 retval = scsi_device_get(sdp->device); 244 if (retval) 245 goto sg_put; 246 247 if (!((flags & O_NONBLOCK) || 248 scsi_block_when_processing_errors(sdp->device))) { 249 retval = -ENXIO; 250 /* we are in error recovery for this device */ 251 goto error_out; 252 } 253 254 if (flags & O_EXCL) { 255 if (O_RDONLY == (flags & O_ACCMODE)) { 256 retval = -EPERM; /* Can't lock it with read only access */ 257 goto error_out; 258 } 259 if (!list_empty(&sdp->sfds) && (flags & O_NONBLOCK)) { 260 retval = -EBUSY; 261 goto error_out; 262 } 263 res = 0; 264 __wait_event_interruptible(sdp->o_excl_wait, 265 ((!list_empty(&sdp->sfds) || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); 266 if (res) { 267 retval = res; /* -ERESTARTSYS because signal hit process */ 268 goto error_out; 269 } 270 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ 271 if (flags & O_NONBLOCK) { 272 retval = -EBUSY; 273 goto error_out; 274 } 275 res = 0; 276 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), 277 res); 278 if (res) { 279 retval = res; /* -ERESTARTSYS because signal hit process */ 280 goto error_out; 281 } 282 } 283 if (sdp->detached) { 284 retval = -ENODEV; 285 goto error_out; 286 } 287 if (list_empty(&sdp->sfds)) { /* no existing opens on this device */ 288 sdp->sgdebug = 0; 289 q = sdp->device->request_queue; 290 sdp->sg_tablesize = queue_max_segments(q); 291 } 292 if ((sfp = sg_add_sfp(sdp, dev))) 293 filp->private_data = sfp; 294 else { 295 if (flags & O_EXCL) { 296 sdp->exclude = 0; /* undo if error */ 297 wake_up_interruptible(&sdp->o_excl_wait); 298 } 299 retval = -ENOMEM; 300 goto error_out; 301 } 302 retval = 0; 303 error_out: 304 if (retval) 305 scsi_device_put(sdp->device); 306 sg_put: 307 if (sdp) 308 sg_put_dev(sdp); 309 unlock_kernel(); 310 return retval; 311 } 312 313 /* Following function was formerly called 'sg_close' */ 314 static int 315 sg_release(struct inode *inode, struct file *filp) 316 { 317 Sg_device *sdp; 318 Sg_fd *sfp; 319 320 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 321 return -ENXIO; 322 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 323 324 sfp->closed = 1; 325 326 sdp->exclude = 0; 327 wake_up_interruptible(&sdp->o_excl_wait); 328 329 kref_put(&sfp->f_ref, sg_remove_sfp); 330 return 0; 331 } 332 333 static ssize_t 334 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 335 { 336 Sg_device *sdp; 337 Sg_fd *sfp; 338 Sg_request *srp; 339 int req_pack_id = -1; 340 sg_io_hdr_t *hp; 341 struct sg_header *old_hdr = NULL; 342 int retval = 0; 343 344 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 345 return -ENXIO; 346 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 347 sdp->disk->disk_name, (int) count)); 348 349 if (!access_ok(VERIFY_WRITE, buf, count)) 350 return -EFAULT; 351 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 352 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 353 if (!old_hdr) 354 return -ENOMEM; 355 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 356 retval = -EFAULT; 357 goto free_old_hdr; 358 } 359 if (old_hdr->reply_len < 0) { 360 if (count >= SZ_SG_IO_HDR) { 361 sg_io_hdr_t *new_hdr; 362 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 363 if (!new_hdr) { 364 retval = -ENOMEM; 365 goto free_old_hdr; 366 } 367 retval =__copy_from_user 368 (new_hdr, buf, SZ_SG_IO_HDR); 369 req_pack_id = new_hdr->pack_id; 370 kfree(new_hdr); 371 if (retval) { 372 retval = -EFAULT; 373 goto free_old_hdr; 374 } 375 } 376 } else 377 req_pack_id = old_hdr->pack_id; 378 } 379 srp = sg_get_rq_mark(sfp, req_pack_id); 380 if (!srp) { /* now wait on packet to arrive */ 381 if (sdp->detached) { 382 retval = -ENODEV; 383 goto free_old_hdr; 384 } 385 if (filp->f_flags & O_NONBLOCK) { 386 retval = -EAGAIN; 387 goto free_old_hdr; 388 } 389 while (1) { 390 retval = 0; /* following macro beats race condition */ 391 __wait_event_interruptible(sfp->read_wait, 392 (sdp->detached || 393 (srp = sg_get_rq_mark(sfp, req_pack_id))), 394 retval); 395 if (sdp->detached) { 396 retval = -ENODEV; 397 goto free_old_hdr; 398 } 399 if (0 == retval) 400 break; 401 402 /* -ERESTARTSYS as signal hit process */ 403 goto free_old_hdr; 404 } 405 } 406 if (srp->header.interface_id != '\0') { 407 retval = sg_new_read(sfp, buf, count, srp); 408 goto free_old_hdr; 409 } 410 411 hp = &srp->header; 412 if (old_hdr == NULL) { 413 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 414 if (! old_hdr) { 415 retval = -ENOMEM; 416 goto free_old_hdr; 417 } 418 } 419 memset(old_hdr, 0, SZ_SG_HEADER); 420 old_hdr->reply_len = (int) hp->timeout; 421 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 422 old_hdr->pack_id = hp->pack_id; 423 old_hdr->twelve_byte = 424 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 425 old_hdr->target_status = hp->masked_status; 426 old_hdr->host_status = hp->host_status; 427 old_hdr->driver_status = hp->driver_status; 428 if ((CHECK_CONDITION & hp->masked_status) || 429 (DRIVER_SENSE & hp->driver_status)) 430 memcpy(old_hdr->sense_buffer, srp->sense_b, 431 sizeof (old_hdr->sense_buffer)); 432 switch (hp->host_status) { 433 /* This setup of 'result' is for backward compatibility and is best 434 ignored by the user who should use target, host + driver status */ 435 case DID_OK: 436 case DID_PASSTHROUGH: 437 case DID_SOFT_ERROR: 438 old_hdr->result = 0; 439 break; 440 case DID_NO_CONNECT: 441 case DID_BUS_BUSY: 442 case DID_TIME_OUT: 443 old_hdr->result = EBUSY; 444 break; 445 case DID_BAD_TARGET: 446 case DID_ABORT: 447 case DID_PARITY: 448 case DID_RESET: 449 case DID_BAD_INTR: 450 old_hdr->result = EIO; 451 break; 452 case DID_ERROR: 453 old_hdr->result = (srp->sense_b[0] == 0 && 454 hp->masked_status == GOOD) ? 0 : EIO; 455 break; 456 default: 457 old_hdr->result = EIO; 458 break; 459 } 460 461 /* Now copy the result back to the user buffer. */ 462 if (count >= SZ_SG_HEADER) { 463 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 464 retval = -EFAULT; 465 goto free_old_hdr; 466 } 467 buf += SZ_SG_HEADER; 468 if (count > old_hdr->reply_len) 469 count = old_hdr->reply_len; 470 if (count > SZ_SG_HEADER) { 471 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 472 retval = -EFAULT; 473 goto free_old_hdr; 474 } 475 } 476 } else 477 count = (old_hdr->result == 0) ? 0 : -EIO; 478 sg_finish_rem_req(srp); 479 retval = count; 480 free_old_hdr: 481 kfree(old_hdr); 482 return retval; 483 } 484 485 static ssize_t 486 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 487 { 488 sg_io_hdr_t *hp = &srp->header; 489 int err = 0; 490 int len; 491 492 if (count < SZ_SG_IO_HDR) { 493 err = -EINVAL; 494 goto err_out; 495 } 496 hp->sb_len_wr = 0; 497 if ((hp->mx_sb_len > 0) && hp->sbp) { 498 if ((CHECK_CONDITION & hp->masked_status) || 499 (DRIVER_SENSE & hp->driver_status)) { 500 int sb_len = SCSI_SENSE_BUFFERSIZE; 501 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 502 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 503 len = (len > sb_len) ? sb_len : len; 504 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 505 err = -EFAULT; 506 goto err_out; 507 } 508 hp->sb_len_wr = len; 509 } 510 } 511 if (hp->masked_status || hp->host_status || hp->driver_status) 512 hp->info |= SG_INFO_CHECK; 513 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 514 err = -EFAULT; 515 goto err_out; 516 } 517 err_out: 518 err = sg_finish_rem_req(srp); 519 return (0 == err) ? count : err; 520 } 521 522 static ssize_t 523 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 524 { 525 int mxsize, cmd_size, k; 526 int input_size, blocking; 527 unsigned char opcode; 528 Sg_device *sdp; 529 Sg_fd *sfp; 530 Sg_request *srp; 531 struct sg_header old_hdr; 532 sg_io_hdr_t *hp; 533 unsigned char cmnd[MAX_COMMAND_SIZE]; 534 535 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 536 return -ENXIO; 537 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 538 sdp->disk->disk_name, (int) count)); 539 if (sdp->detached) 540 return -ENODEV; 541 if (!((filp->f_flags & O_NONBLOCK) || 542 scsi_block_when_processing_errors(sdp->device))) 543 return -ENXIO; 544 545 if (!access_ok(VERIFY_READ, buf, count)) 546 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 547 if (count < SZ_SG_HEADER) 548 return -EIO; 549 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 550 return -EFAULT; 551 blocking = !(filp->f_flags & O_NONBLOCK); 552 if (old_hdr.reply_len < 0) 553 return sg_new_write(sfp, filp, buf, count, 554 blocking, 0, 0, NULL); 555 if (count < (SZ_SG_HEADER + 6)) 556 return -EIO; /* The minimum scsi command length is 6 bytes. */ 557 558 if (!(srp = sg_add_request(sfp))) { 559 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 560 return -EDOM; 561 } 562 buf += SZ_SG_HEADER; 563 __get_user(opcode, buf); 564 if (sfp->next_cmd_len > 0) { 565 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 566 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 567 sfp->next_cmd_len = 0; 568 sg_remove_request(sfp, srp); 569 return -EIO; 570 } 571 cmd_size = sfp->next_cmd_len; 572 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 573 } else { 574 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 575 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 576 cmd_size = 12; 577 } 578 SCSI_LOG_TIMEOUT(4, printk( 579 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 580 /* Determine buffer size. */ 581 input_size = count - cmd_size; 582 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 583 mxsize -= SZ_SG_HEADER; 584 input_size -= SZ_SG_HEADER; 585 if (input_size < 0) { 586 sg_remove_request(sfp, srp); 587 return -EIO; /* User did not pass enough bytes for this command. */ 588 } 589 hp = &srp->header; 590 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 591 hp->cmd_len = (unsigned char) cmd_size; 592 hp->iovec_count = 0; 593 hp->mx_sb_len = 0; 594 if (input_size > 0) 595 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 596 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 597 else 598 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 599 hp->dxfer_len = mxsize; 600 if (hp->dxfer_direction == SG_DXFER_TO_DEV) 601 hp->dxferp = (char __user *)buf + cmd_size; 602 else 603 hp->dxferp = NULL; 604 hp->sbp = NULL; 605 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 606 hp->flags = input_size; /* structure abuse ... */ 607 hp->pack_id = old_hdr.pack_id; 608 hp->usr_ptr = NULL; 609 if (__copy_from_user(cmnd, buf, cmd_size)) 610 return -EFAULT; 611 /* 612 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 613 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 614 * is a non-zero input_size, so emit a warning. 615 */ 616 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { 617 static char cmd[TASK_COMM_LEN]; 618 if (strcmp(current->comm, cmd) && printk_ratelimit()) { 619 printk(KERN_WARNING 620 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" 621 "guessing data in;\n " 622 "program %s not setting count and/or reply_len properly\n", 623 old_hdr.reply_len - (int)SZ_SG_HEADER, 624 input_size, (unsigned int) cmnd[0], 625 current->comm); 626 strcpy(cmd, current->comm); 627 } 628 } 629 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 630 return (k < 0) ? k : count; 631 } 632 633 static ssize_t 634 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, 635 size_t count, int blocking, int read_only, int sg_io_owned, 636 Sg_request **o_srp) 637 { 638 int k; 639 Sg_request *srp; 640 sg_io_hdr_t *hp; 641 unsigned char cmnd[MAX_COMMAND_SIZE]; 642 int timeout; 643 unsigned long ul_timeout; 644 645 if (count < SZ_SG_IO_HDR) 646 return -EINVAL; 647 if (!access_ok(VERIFY_READ, buf, count)) 648 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 649 650 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 651 if (!(srp = sg_add_request(sfp))) { 652 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 653 return -EDOM; 654 } 655 srp->sg_io_owned = sg_io_owned; 656 hp = &srp->header; 657 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 658 sg_remove_request(sfp, srp); 659 return -EFAULT; 660 } 661 if (hp->interface_id != 'S') { 662 sg_remove_request(sfp, srp); 663 return -ENOSYS; 664 } 665 if (hp->flags & SG_FLAG_MMAP_IO) { 666 if (hp->dxfer_len > sfp->reserve.bufflen) { 667 sg_remove_request(sfp, srp); 668 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 669 } 670 if (hp->flags & SG_FLAG_DIRECT_IO) { 671 sg_remove_request(sfp, srp); 672 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 673 } 674 if (sg_res_in_use(sfp)) { 675 sg_remove_request(sfp, srp); 676 return -EBUSY; /* reserve buffer already being used */ 677 } 678 } 679 ul_timeout = msecs_to_jiffies(srp->header.timeout); 680 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 681 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 682 sg_remove_request(sfp, srp); 683 return -EMSGSIZE; 684 } 685 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 686 sg_remove_request(sfp, srp); 687 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 688 } 689 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 690 sg_remove_request(sfp, srp); 691 return -EFAULT; 692 } 693 if (read_only && sg_allow_access(file, cmnd)) { 694 sg_remove_request(sfp, srp); 695 return -EPERM; 696 } 697 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 698 if (k < 0) 699 return k; 700 if (o_srp) 701 *o_srp = srp; 702 return count; 703 } 704 705 static int 706 sg_common_write(Sg_fd * sfp, Sg_request * srp, 707 unsigned char *cmnd, int timeout, int blocking) 708 { 709 int k, data_dir; 710 Sg_device *sdp = sfp->parentdp; 711 sg_io_hdr_t *hp = &srp->header; 712 713 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 714 hp->status = 0; 715 hp->masked_status = 0; 716 hp->msg_status = 0; 717 hp->info = 0; 718 hp->host_status = 0; 719 hp->driver_status = 0; 720 hp->resid = 0; 721 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 722 (int) cmnd[0], (int) hp->cmd_len)); 723 724 k = sg_start_req(srp, cmnd); 725 if (k) { 726 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); 727 sg_finish_rem_req(srp); 728 return k; /* probably out of space --> ENOMEM */ 729 } 730 if (sdp->detached) { 731 sg_finish_rem_req(srp); 732 return -ENODEV; 733 } 734 735 switch (hp->dxfer_direction) { 736 case SG_DXFER_TO_FROM_DEV: 737 case SG_DXFER_FROM_DEV: 738 data_dir = DMA_FROM_DEVICE; 739 break; 740 case SG_DXFER_TO_DEV: 741 data_dir = DMA_TO_DEVICE; 742 break; 743 case SG_DXFER_UNKNOWN: 744 data_dir = DMA_BIDIRECTIONAL; 745 break; 746 default: 747 data_dir = DMA_NONE; 748 break; 749 } 750 hp->duration = jiffies_to_msecs(jiffies); 751 752 srp->rq->timeout = timeout; 753 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ 754 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, 755 srp->rq, 1, sg_rq_end_io); 756 return 0; 757 } 758 759 static int 760 sg_ioctl(struct inode *inode, struct file *filp, 761 unsigned int cmd_in, unsigned long arg) 762 { 763 void __user *p = (void __user *)arg; 764 int __user *ip = p; 765 int result, val, read_only; 766 Sg_device *sdp; 767 Sg_fd *sfp; 768 Sg_request *srp; 769 unsigned long iflags; 770 771 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 772 return -ENXIO; 773 774 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 775 sdp->disk->disk_name, (int) cmd_in)); 776 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 777 778 switch (cmd_in) { 779 case SG_IO: 780 { 781 int blocking = 1; /* ignore O_NONBLOCK flag */ 782 783 if (sdp->detached) 784 return -ENODEV; 785 if (!scsi_block_when_processing_errors(sdp->device)) 786 return -ENXIO; 787 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 788 return -EFAULT; 789 result = 790 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, 791 blocking, read_only, 1, &srp); 792 if (result < 0) 793 return result; 794 while (1) { 795 result = 0; /* following macro to beat race condition */ 796 __wait_event_interruptible(sfp->read_wait, 797 (srp->done || sdp->detached), 798 result); 799 if (sdp->detached) 800 return -ENODEV; 801 write_lock_irq(&sfp->rq_list_lock); 802 if (srp->done) { 803 srp->done = 2; 804 write_unlock_irq(&sfp->rq_list_lock); 805 break; 806 } 807 srp->orphan = 1; 808 write_unlock_irq(&sfp->rq_list_lock); 809 return result; /* -ERESTARTSYS because signal hit process */ 810 } 811 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 812 return (result < 0) ? result : 0; 813 } 814 case SG_SET_TIMEOUT: 815 result = get_user(val, ip); 816 if (result) 817 return result; 818 if (val < 0) 819 return -EIO; 820 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 821 val = MULDIV (INT_MAX, USER_HZ, HZ); 822 sfp->timeout_user = val; 823 sfp->timeout = MULDIV (val, HZ, USER_HZ); 824 825 return 0; 826 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 827 /* strange ..., for backward compatibility */ 828 return sfp->timeout_user; 829 case SG_SET_FORCE_LOW_DMA: 830 result = get_user(val, ip); 831 if (result) 832 return result; 833 if (val) { 834 sfp->low_dma = 1; 835 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 836 val = (int) sfp->reserve.bufflen; 837 sg_remove_scat(&sfp->reserve); 838 sg_build_reserve(sfp, val); 839 } 840 } else { 841 if (sdp->detached) 842 return -ENODEV; 843 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 844 } 845 return 0; 846 case SG_GET_LOW_DMA: 847 return put_user((int) sfp->low_dma, ip); 848 case SG_GET_SCSI_ID: 849 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 850 return -EFAULT; 851 else { 852 sg_scsi_id_t __user *sg_idp = p; 853 854 if (sdp->detached) 855 return -ENODEV; 856 __put_user((int) sdp->device->host->host_no, 857 &sg_idp->host_no); 858 __put_user((int) sdp->device->channel, 859 &sg_idp->channel); 860 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 861 __put_user((int) sdp->device->lun, &sg_idp->lun); 862 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 863 __put_user((short) sdp->device->host->cmd_per_lun, 864 &sg_idp->h_cmd_per_lun); 865 __put_user((short) sdp->device->queue_depth, 866 &sg_idp->d_queue_depth); 867 __put_user(0, &sg_idp->unused[0]); 868 __put_user(0, &sg_idp->unused[1]); 869 return 0; 870 } 871 case SG_SET_FORCE_PACK_ID: 872 result = get_user(val, ip); 873 if (result) 874 return result; 875 sfp->force_packid = val ? 1 : 0; 876 return 0; 877 case SG_GET_PACK_ID: 878 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 879 return -EFAULT; 880 read_lock_irqsave(&sfp->rq_list_lock, iflags); 881 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 882 if ((1 == srp->done) && (!srp->sg_io_owned)) { 883 read_unlock_irqrestore(&sfp->rq_list_lock, 884 iflags); 885 __put_user(srp->header.pack_id, ip); 886 return 0; 887 } 888 } 889 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 890 __put_user(-1, ip); 891 return 0; 892 case SG_GET_NUM_WAITING: 893 read_lock_irqsave(&sfp->rq_list_lock, iflags); 894 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 895 if ((1 == srp->done) && (!srp->sg_io_owned)) 896 ++val; 897 } 898 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 899 return put_user(val, ip); 900 case SG_GET_SG_TABLESIZE: 901 return put_user(sdp->sg_tablesize, ip); 902 case SG_SET_RESERVED_SIZE: 903 result = get_user(val, ip); 904 if (result) 905 return result; 906 if (val < 0) 907 return -EINVAL; 908 val = min_t(int, val, 909 queue_max_sectors(sdp->device->request_queue) * 512); 910 if (val != sfp->reserve.bufflen) { 911 if (sg_res_in_use(sfp) || sfp->mmap_called) 912 return -EBUSY; 913 sg_remove_scat(&sfp->reserve); 914 sg_build_reserve(sfp, val); 915 } 916 return 0; 917 case SG_GET_RESERVED_SIZE: 918 val = min_t(int, sfp->reserve.bufflen, 919 queue_max_sectors(sdp->device->request_queue) * 512); 920 return put_user(val, ip); 921 case SG_SET_COMMAND_Q: 922 result = get_user(val, ip); 923 if (result) 924 return result; 925 sfp->cmd_q = val ? 1 : 0; 926 return 0; 927 case SG_GET_COMMAND_Q: 928 return put_user((int) sfp->cmd_q, ip); 929 case SG_SET_KEEP_ORPHAN: 930 result = get_user(val, ip); 931 if (result) 932 return result; 933 sfp->keep_orphan = val; 934 return 0; 935 case SG_GET_KEEP_ORPHAN: 936 return put_user((int) sfp->keep_orphan, ip); 937 case SG_NEXT_CMD_LEN: 938 result = get_user(val, ip); 939 if (result) 940 return result; 941 sfp->next_cmd_len = (val > 0) ? val : 0; 942 return 0; 943 case SG_GET_VERSION_NUM: 944 return put_user(sg_version_num, ip); 945 case SG_GET_ACCESS_COUNT: 946 /* faked - we don't have a real access count anymore */ 947 val = (sdp->device ? 1 : 0); 948 return put_user(val, ip); 949 case SG_GET_REQUEST_TABLE: 950 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 951 return -EFAULT; 952 else { 953 sg_req_info_t *rinfo; 954 unsigned int ms; 955 956 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 957 GFP_KERNEL); 958 if (!rinfo) 959 return -ENOMEM; 960 read_lock_irqsave(&sfp->rq_list_lock, iflags); 961 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 962 ++val, srp = srp ? srp->nextrp : srp) { 963 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 964 if (srp) { 965 rinfo[val].req_state = srp->done + 1; 966 rinfo[val].problem = 967 srp->header.masked_status & 968 srp->header.host_status & 969 srp->header.driver_status; 970 if (srp->done) 971 rinfo[val].duration = 972 srp->header.duration; 973 else { 974 ms = jiffies_to_msecs(jiffies); 975 rinfo[val].duration = 976 (ms > srp->header.duration) ? 977 (ms - srp->header.duration) : 0; 978 } 979 rinfo[val].orphan = srp->orphan; 980 rinfo[val].sg_io_owned = 981 srp->sg_io_owned; 982 rinfo[val].pack_id = 983 srp->header.pack_id; 984 rinfo[val].usr_ptr = 985 srp->header.usr_ptr; 986 } 987 } 988 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 989 result = __copy_to_user(p, rinfo, 990 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 991 result = result ? -EFAULT : 0; 992 kfree(rinfo); 993 return result; 994 } 995 case SG_EMULATED_HOST: 996 if (sdp->detached) 997 return -ENODEV; 998 return put_user(sdp->device->host->hostt->emulated, ip); 999 case SG_SCSI_RESET: 1000 if (sdp->detached) 1001 return -ENODEV; 1002 if (filp->f_flags & O_NONBLOCK) { 1003 if (scsi_host_in_recovery(sdp->device->host)) 1004 return -EBUSY; 1005 } else if (!scsi_block_when_processing_errors(sdp->device)) 1006 return -EBUSY; 1007 result = get_user(val, ip); 1008 if (result) 1009 return result; 1010 if (SG_SCSI_RESET_NOTHING == val) 1011 return 0; 1012 switch (val) { 1013 case SG_SCSI_RESET_DEVICE: 1014 val = SCSI_TRY_RESET_DEVICE; 1015 break; 1016 case SG_SCSI_RESET_TARGET: 1017 val = SCSI_TRY_RESET_TARGET; 1018 break; 1019 case SG_SCSI_RESET_BUS: 1020 val = SCSI_TRY_RESET_BUS; 1021 break; 1022 case SG_SCSI_RESET_HOST: 1023 val = SCSI_TRY_RESET_HOST; 1024 break; 1025 default: 1026 return -EINVAL; 1027 } 1028 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1029 return -EACCES; 1030 return (scsi_reset_provider(sdp->device, val) == 1031 SUCCESS) ? 0 : -EIO; 1032 case SCSI_IOCTL_SEND_COMMAND: 1033 if (sdp->detached) 1034 return -ENODEV; 1035 if (read_only) { 1036 unsigned char opcode = WRITE_6; 1037 Scsi_Ioctl_Command __user *siocp = p; 1038 1039 if (copy_from_user(&opcode, siocp->data, 1)) 1040 return -EFAULT; 1041 if (sg_allow_access(filp, &opcode)) 1042 return -EPERM; 1043 } 1044 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); 1045 case SG_SET_DEBUG: 1046 result = get_user(val, ip); 1047 if (result) 1048 return result; 1049 sdp->sgdebug = (char) val; 1050 return 0; 1051 case SCSI_IOCTL_GET_IDLUN: 1052 case SCSI_IOCTL_GET_BUS_NUMBER: 1053 case SCSI_IOCTL_PROBE_HOST: 1054 case SG_GET_TRANSFORM: 1055 if (sdp->detached) 1056 return -ENODEV; 1057 return scsi_ioctl(sdp->device, cmd_in, p); 1058 case BLKSECTGET: 1059 return put_user(queue_max_sectors(sdp->device->request_queue) * 512, 1060 ip); 1061 case BLKTRACESETUP: 1062 return blk_trace_setup(sdp->device->request_queue, 1063 sdp->disk->disk_name, 1064 MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1065 NULL, 1066 (char *)arg); 1067 case BLKTRACESTART: 1068 return blk_trace_startstop(sdp->device->request_queue, 1); 1069 case BLKTRACESTOP: 1070 return blk_trace_startstop(sdp->device->request_queue, 0); 1071 case BLKTRACETEARDOWN: 1072 return blk_trace_remove(sdp->device->request_queue); 1073 default: 1074 if (read_only) 1075 return -EPERM; /* don't know so take safe approach */ 1076 return scsi_ioctl(sdp->device, cmd_in, p); 1077 } 1078 } 1079 1080 #ifdef CONFIG_COMPAT 1081 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1082 { 1083 Sg_device *sdp; 1084 Sg_fd *sfp; 1085 struct scsi_device *sdev; 1086 1087 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1088 return -ENXIO; 1089 1090 sdev = sdp->device; 1091 if (sdev->host->hostt->compat_ioctl) { 1092 int ret; 1093 1094 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1095 1096 return ret; 1097 } 1098 1099 return -ENOIOCTLCMD; 1100 } 1101 #endif 1102 1103 static unsigned int 1104 sg_poll(struct file *filp, poll_table * wait) 1105 { 1106 unsigned int res = 0; 1107 Sg_device *sdp; 1108 Sg_fd *sfp; 1109 Sg_request *srp; 1110 int count = 0; 1111 unsigned long iflags; 1112 1113 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) 1114 || sfp->closed) 1115 return POLLERR; 1116 poll_wait(filp, &sfp->read_wait, wait); 1117 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1118 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1119 /* if any read waiting, flag it */ 1120 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1121 res = POLLIN | POLLRDNORM; 1122 ++count; 1123 } 1124 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1125 1126 if (sdp->detached) 1127 res |= POLLHUP; 1128 else if (!sfp->cmd_q) { 1129 if (0 == count) 1130 res |= POLLOUT | POLLWRNORM; 1131 } else if (count < SG_MAX_QUEUE) 1132 res |= POLLOUT | POLLWRNORM; 1133 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1134 sdp->disk->disk_name, (int) res)); 1135 return res; 1136 } 1137 1138 static int 1139 sg_fasync(int fd, struct file *filp, int mode) 1140 { 1141 Sg_device *sdp; 1142 Sg_fd *sfp; 1143 1144 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1145 return -ENXIO; 1146 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1147 sdp->disk->disk_name, mode)); 1148 1149 return fasync_helper(fd, filp, mode, &sfp->async_qp); 1150 } 1151 1152 static int 1153 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1154 { 1155 Sg_fd *sfp; 1156 unsigned long offset, len, sa; 1157 Sg_scatter_hold *rsv_schp; 1158 int k, length; 1159 1160 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1161 return VM_FAULT_SIGBUS; 1162 rsv_schp = &sfp->reserve; 1163 offset = vmf->pgoff << PAGE_SHIFT; 1164 if (offset >= rsv_schp->bufflen) 1165 return VM_FAULT_SIGBUS; 1166 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", 1167 offset, rsv_schp->k_use_sg)); 1168 sa = vma->vm_start; 1169 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1170 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1171 len = vma->vm_end - sa; 1172 len = (len < length) ? len : length; 1173 if (offset < len) { 1174 struct page *page = nth_page(rsv_schp->pages[k], 1175 offset >> PAGE_SHIFT); 1176 get_page(page); /* increment page count */ 1177 vmf->page = page; 1178 return 0; /* success */ 1179 } 1180 sa += len; 1181 offset -= len; 1182 } 1183 1184 return VM_FAULT_SIGBUS; 1185 } 1186 1187 static const struct vm_operations_struct sg_mmap_vm_ops = { 1188 .fault = sg_vma_fault, 1189 }; 1190 1191 static int 1192 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1193 { 1194 Sg_fd *sfp; 1195 unsigned long req_sz, len, sa; 1196 Sg_scatter_hold *rsv_schp; 1197 int k, length; 1198 1199 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1200 return -ENXIO; 1201 req_sz = vma->vm_end - vma->vm_start; 1202 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1203 (void *) vma->vm_start, (int) req_sz)); 1204 if (vma->vm_pgoff) 1205 return -EINVAL; /* want no offset */ 1206 rsv_schp = &sfp->reserve; 1207 if (req_sz > rsv_schp->bufflen) 1208 return -ENOMEM; /* cannot map more than reserved buffer */ 1209 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 sa += len; 1216 } 1217 1218 sfp->mmap_called = 1; 1219 vma->vm_flags |= VM_RESERVED; 1220 vma->vm_private_data = sfp; 1221 vma->vm_ops = &sg_mmap_vm_ops; 1222 return 0; 1223 } 1224 1225 static void sg_rq_end_io_usercontext(struct work_struct *work) 1226 { 1227 struct sg_request *srp = container_of(work, struct sg_request, ew.work); 1228 struct sg_fd *sfp = srp->parentfp; 1229 1230 sg_finish_rem_req(srp); 1231 kref_put(&sfp->f_ref, sg_remove_sfp); 1232 } 1233 1234 /* 1235 * This function is a "bottom half" handler that is called by the mid 1236 * level when a command is completed (or has failed). 1237 */ 1238 static void sg_rq_end_io(struct request *rq, int uptodate) 1239 { 1240 struct sg_request *srp = rq->end_io_data; 1241 Sg_device *sdp; 1242 Sg_fd *sfp; 1243 unsigned long iflags; 1244 unsigned int ms; 1245 char *sense; 1246 int result, resid, done = 1; 1247 1248 if (WARN_ON(srp->done != 0)) 1249 return; 1250 1251 sfp = srp->parentfp; 1252 if (WARN_ON(sfp == NULL)) 1253 return; 1254 1255 sdp = sfp->parentdp; 1256 if (unlikely(sdp->detached)) 1257 printk(KERN_INFO "sg_rq_end_io: device detached\n"); 1258 1259 sense = rq->sense; 1260 result = rq->errors; 1261 resid = rq->resid_len; 1262 1263 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1264 sdp->disk->disk_name, srp->header.pack_id, result)); 1265 srp->header.resid = resid; 1266 ms = jiffies_to_msecs(jiffies); 1267 srp->header.duration = (ms > srp->header.duration) ? 1268 (ms - srp->header.duration) : 0; 1269 if (0 != result) { 1270 struct scsi_sense_hdr sshdr; 1271 1272 srp->header.status = 0xff & result; 1273 srp->header.masked_status = status_byte(result); 1274 srp->header.msg_status = msg_byte(result); 1275 srp->header.host_status = host_byte(result); 1276 srp->header.driver_status = driver_byte(result); 1277 if ((sdp->sgdebug > 0) && 1278 ((CHECK_CONDITION == srp->header.masked_status) || 1279 (COMMAND_TERMINATED == srp->header.masked_status))) 1280 __scsi_print_sense("sg_cmd_done", sense, 1281 SCSI_SENSE_BUFFERSIZE); 1282 1283 /* Following if statement is a patch supplied by Eric Youngdale */ 1284 if (driver_byte(result) != 0 1285 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1286 && !scsi_sense_is_deferred(&sshdr) 1287 && sshdr.sense_key == UNIT_ATTENTION 1288 && sdp->device->removable) { 1289 /* Detected possible disc change. Set the bit - this */ 1290 /* may be used if there are filesystems using this device */ 1291 sdp->device->changed = 1; 1292 } 1293 } 1294 /* Rely on write phase to clean out srp status values, so no "else" */ 1295 1296 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1297 if (unlikely(srp->orphan)) { 1298 if (sfp->keep_orphan) 1299 srp->sg_io_owned = 0; 1300 else 1301 done = 0; 1302 } 1303 srp->done = done; 1304 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1305 1306 if (likely(done)) { 1307 /* Now wake up any sg_read() that is waiting for this 1308 * packet. 1309 */ 1310 wake_up_interruptible(&sfp->read_wait); 1311 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1312 kref_put(&sfp->f_ref, sg_remove_sfp); 1313 } else { 1314 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); 1315 schedule_work(&srp->ew.work); 1316 } 1317 } 1318 1319 static const struct file_operations sg_fops = { 1320 .owner = THIS_MODULE, 1321 .read = sg_read, 1322 .write = sg_write, 1323 .poll = sg_poll, 1324 .ioctl = sg_ioctl, 1325 #ifdef CONFIG_COMPAT 1326 .compat_ioctl = sg_compat_ioctl, 1327 #endif 1328 .open = sg_open, 1329 .mmap = sg_mmap, 1330 .release = sg_release, 1331 .fasync = sg_fasync, 1332 }; 1333 1334 static struct class *sg_sysfs_class; 1335 1336 static int sg_sysfs_valid = 0; 1337 1338 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1339 { 1340 struct request_queue *q = scsidp->request_queue; 1341 Sg_device *sdp; 1342 unsigned long iflags; 1343 int error; 1344 u32 k; 1345 1346 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1347 if (!sdp) { 1348 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1349 return ERR_PTR(-ENOMEM); 1350 } 1351 1352 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) { 1353 printk(KERN_WARNING "idr expansion Sg_device failure\n"); 1354 error = -ENOMEM; 1355 goto out; 1356 } 1357 1358 write_lock_irqsave(&sg_index_lock, iflags); 1359 1360 error = idr_get_new(&sg_index_idr, sdp, &k); 1361 if (error) { 1362 write_unlock_irqrestore(&sg_index_lock, iflags); 1363 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n", 1364 error); 1365 goto out; 1366 } 1367 1368 if (unlikely(k >= SG_MAX_DEVS)) 1369 goto overflow; 1370 1371 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1372 sprintf(disk->disk_name, "sg%d", k); 1373 disk->first_minor = k; 1374 sdp->disk = disk; 1375 sdp->device = scsidp; 1376 INIT_LIST_HEAD(&sdp->sfds); 1377 init_waitqueue_head(&sdp->o_excl_wait); 1378 sdp->sg_tablesize = queue_max_segments(q); 1379 sdp->index = k; 1380 kref_init(&sdp->d_ref); 1381 1382 write_unlock_irqrestore(&sg_index_lock, iflags); 1383 1384 error = 0; 1385 out: 1386 if (error) { 1387 kfree(sdp); 1388 return ERR_PTR(error); 1389 } 1390 return sdp; 1391 1392 overflow: 1393 idr_remove(&sg_index_idr, k); 1394 write_unlock_irqrestore(&sg_index_lock, iflags); 1395 sdev_printk(KERN_WARNING, scsidp, 1396 "Unable to attach sg device type=%d, minor " 1397 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); 1398 error = -ENODEV; 1399 goto out; 1400 } 1401 1402 static int 1403 sg_add(struct device *cl_dev, struct class_interface *cl_intf) 1404 { 1405 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1406 struct gendisk *disk; 1407 Sg_device *sdp = NULL; 1408 struct cdev * cdev = NULL; 1409 int error; 1410 unsigned long iflags; 1411 1412 disk = alloc_disk(1); 1413 if (!disk) { 1414 printk(KERN_WARNING "alloc_disk failed\n"); 1415 return -ENOMEM; 1416 } 1417 disk->major = SCSI_GENERIC_MAJOR; 1418 1419 error = -ENOMEM; 1420 cdev = cdev_alloc(); 1421 if (!cdev) { 1422 printk(KERN_WARNING "cdev_alloc failed\n"); 1423 goto out; 1424 } 1425 cdev->owner = THIS_MODULE; 1426 cdev->ops = &sg_fops; 1427 1428 sdp = sg_alloc(disk, scsidp); 1429 if (IS_ERR(sdp)) { 1430 printk(KERN_WARNING "sg_alloc failed\n"); 1431 error = PTR_ERR(sdp); 1432 goto out; 1433 } 1434 1435 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); 1436 if (error) 1437 goto cdev_add_err; 1438 1439 sdp->cdev = cdev; 1440 if (sg_sysfs_valid) { 1441 struct device *sg_class_member; 1442 1443 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, 1444 MKDEV(SCSI_GENERIC_MAJOR, 1445 sdp->index), 1446 sdp, "%s", disk->disk_name); 1447 if (IS_ERR(sg_class_member)) { 1448 printk(KERN_ERR "sg_add: " 1449 "device_create failed\n"); 1450 error = PTR_ERR(sg_class_member); 1451 goto cdev_add_err; 1452 } 1453 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1454 &sg_class_member->kobj, "generic"); 1455 if (error) 1456 printk(KERN_ERR "sg_add: unable to make symlink " 1457 "'generic' back to sg%d\n", sdp->index); 1458 } else 1459 printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); 1460 1461 sdev_printk(KERN_NOTICE, scsidp, 1462 "Attached scsi generic sg%d type %d\n", sdp->index, 1463 scsidp->type); 1464 1465 dev_set_drvdata(cl_dev, sdp); 1466 1467 return 0; 1468 1469 cdev_add_err: 1470 write_lock_irqsave(&sg_index_lock, iflags); 1471 idr_remove(&sg_index_idr, sdp->index); 1472 write_unlock_irqrestore(&sg_index_lock, iflags); 1473 kfree(sdp); 1474 1475 out: 1476 put_disk(disk); 1477 if (cdev) 1478 cdev_del(cdev); 1479 return error; 1480 } 1481 1482 static void sg_device_destroy(struct kref *kref) 1483 { 1484 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); 1485 unsigned long flags; 1486 1487 /* CAUTION! Note that the device can still be found via idr_find() 1488 * even though the refcount is 0. Therefore, do idr_remove() BEFORE 1489 * any other cleanup. 1490 */ 1491 1492 write_lock_irqsave(&sg_index_lock, flags); 1493 idr_remove(&sg_index_idr, sdp->index); 1494 write_unlock_irqrestore(&sg_index_lock, flags); 1495 1496 SCSI_LOG_TIMEOUT(3, 1497 printk("sg_device_destroy: %s\n", 1498 sdp->disk->disk_name)); 1499 1500 put_disk(sdp->disk); 1501 kfree(sdp); 1502 } 1503 1504 static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf) 1505 { 1506 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1507 Sg_device *sdp = dev_get_drvdata(cl_dev); 1508 unsigned long iflags; 1509 Sg_fd *sfp; 1510 1511 if (!sdp || sdp->detached) 1512 return; 1513 1514 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name)); 1515 1516 /* Need a write lock to set sdp->detached. */ 1517 write_lock_irqsave(&sg_index_lock, iflags); 1518 sdp->detached = 1; 1519 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { 1520 wake_up_interruptible(&sfp->read_wait); 1521 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); 1522 } 1523 write_unlock_irqrestore(&sg_index_lock, iflags); 1524 1525 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1526 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); 1527 cdev_del(sdp->cdev); 1528 sdp->cdev = NULL; 1529 1530 sg_put_dev(sdp); 1531 } 1532 1533 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1534 module_param_named(def_reserved_size, def_reserved_size, int, 1535 S_IRUGO | S_IWUSR); 1536 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1537 1538 MODULE_AUTHOR("Douglas Gilbert"); 1539 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1540 MODULE_LICENSE("GPL"); 1541 MODULE_VERSION(SG_VERSION_STR); 1542 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1543 1544 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1545 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1546 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1547 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1548 1549 static int __init 1550 init_sg(void) 1551 { 1552 int rc; 1553 1554 if (scatter_elem_sz < PAGE_SIZE) { 1555 scatter_elem_sz = PAGE_SIZE; 1556 scatter_elem_sz_prev = scatter_elem_sz; 1557 } 1558 if (def_reserved_size >= 0) 1559 sg_big_buff = def_reserved_size; 1560 else 1561 def_reserved_size = sg_big_buff; 1562 1563 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1564 SG_MAX_DEVS, "sg"); 1565 if (rc) 1566 return rc; 1567 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1568 if ( IS_ERR(sg_sysfs_class) ) { 1569 rc = PTR_ERR(sg_sysfs_class); 1570 goto err_out; 1571 } 1572 sg_sysfs_valid = 1; 1573 rc = scsi_register_interface(&sg_interface); 1574 if (0 == rc) { 1575 #ifdef CONFIG_SCSI_PROC_FS 1576 sg_proc_init(); 1577 #endif /* CONFIG_SCSI_PROC_FS */ 1578 return 0; 1579 } 1580 class_destroy(sg_sysfs_class); 1581 err_out: 1582 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1583 return rc; 1584 } 1585 1586 static void __exit 1587 exit_sg(void) 1588 { 1589 #ifdef CONFIG_SCSI_PROC_FS 1590 sg_proc_cleanup(); 1591 #endif /* CONFIG_SCSI_PROC_FS */ 1592 scsi_unregister_interface(&sg_interface); 1593 class_destroy(sg_sysfs_class); 1594 sg_sysfs_valid = 0; 1595 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1596 SG_MAX_DEVS); 1597 idr_destroy(&sg_index_idr); 1598 } 1599 1600 static int sg_start_req(Sg_request *srp, unsigned char *cmd) 1601 { 1602 int res; 1603 struct request *rq; 1604 Sg_fd *sfp = srp->parentfp; 1605 sg_io_hdr_t *hp = &srp->header; 1606 int dxfer_len = (int) hp->dxfer_len; 1607 int dxfer_dir = hp->dxfer_direction; 1608 unsigned int iov_count = hp->iovec_count; 1609 Sg_scatter_hold *req_schp = &srp->data; 1610 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1611 struct request_queue *q = sfp->parentdp->device->request_queue; 1612 struct rq_map_data *md, map_data; 1613 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; 1614 1615 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n", 1616 dxfer_len)); 1617 1618 rq = blk_get_request(q, rw, GFP_ATOMIC); 1619 if (!rq) 1620 return -ENOMEM; 1621 1622 memcpy(rq->cmd, cmd, hp->cmd_len); 1623 1624 rq->cmd_len = hp->cmd_len; 1625 rq->cmd_type = REQ_TYPE_BLOCK_PC; 1626 1627 srp->rq = rq; 1628 rq->end_io_data = srp; 1629 rq->sense = srp->sense_b; 1630 rq->retries = SG_DEFAULT_RETRIES; 1631 1632 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1633 return 0; 1634 1635 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && 1636 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && 1637 !sfp->parentdp->device->host->unchecked_isa_dma && 1638 blk_rq_aligned(q, hp->dxferp, dxfer_len)) 1639 md = NULL; 1640 else 1641 md = &map_data; 1642 1643 if (md) { 1644 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) 1645 sg_link_reserve(sfp, srp, dxfer_len); 1646 else { 1647 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1648 if (res) 1649 return res; 1650 } 1651 1652 md->pages = req_schp->pages; 1653 md->page_order = req_schp->page_order; 1654 md->nr_entries = req_schp->k_use_sg; 1655 md->offset = 0; 1656 md->null_mapped = hp->dxferp ? 0 : 1; 1657 if (dxfer_dir == SG_DXFER_TO_FROM_DEV) 1658 md->from_user = 1; 1659 else 1660 md->from_user = 0; 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->rq) { 1710 if (srp->bio) 1711 ret = blk_rq_unmap_user(srp->bio); 1712 1713 blk_put_request(srp->rq); 1714 } 1715 1716 if (srp->res_used) 1717 sg_unlink_reserve(sfp, srp); 1718 else 1719 sg_remove_scat(req_schp); 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[i], 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 const struct file_operations adio_fops = { 2196 .owner = THIS_MODULE, 2197 .open = sg_proc_single_open_adio, 2198 .read = seq_read, 2199 .llseek = seq_lseek, 2200 .write = sg_proc_write_adio, 2201 .release = single_release, 2202 }; 2203 2204 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2205 static ssize_t sg_proc_write_dressz(struct file *filp, 2206 const char __user *buffer, size_t count, loff_t *off); 2207 static const struct file_operations dressz_fops = { 2208 .owner = THIS_MODULE, 2209 .open = sg_proc_single_open_dressz, 2210 .read = seq_read, 2211 .llseek = seq_lseek, 2212 .write = sg_proc_write_dressz, 2213 .release = single_release, 2214 }; 2215 2216 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2217 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2218 static const struct file_operations version_fops = { 2219 .owner = THIS_MODULE, 2220 .open = sg_proc_single_open_version, 2221 .read = seq_read, 2222 .llseek = seq_lseek, 2223 .release = single_release, 2224 }; 2225 2226 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2227 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2228 static const struct file_operations devhdr_fops = { 2229 .owner = THIS_MODULE, 2230 .open = sg_proc_single_open_devhdr, 2231 .read = seq_read, 2232 .llseek = seq_lseek, 2233 .release = single_release, 2234 }; 2235 2236 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2237 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2238 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2239 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2240 static void dev_seq_stop(struct seq_file *s, void *v); 2241 static const struct file_operations dev_fops = { 2242 .owner = THIS_MODULE, 2243 .open = sg_proc_open_dev, 2244 .read = seq_read, 2245 .llseek = seq_lseek, 2246 .release = seq_release, 2247 }; 2248 static const struct seq_operations dev_seq_ops = { 2249 .start = dev_seq_start, 2250 .next = dev_seq_next, 2251 .stop = dev_seq_stop, 2252 .show = sg_proc_seq_show_dev, 2253 }; 2254 2255 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2256 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2257 static const struct file_operations devstrs_fops = { 2258 .owner = THIS_MODULE, 2259 .open = sg_proc_open_devstrs, 2260 .read = seq_read, 2261 .llseek = seq_lseek, 2262 .release = seq_release, 2263 }; 2264 static const struct seq_operations devstrs_seq_ops = { 2265 .start = dev_seq_start, 2266 .next = dev_seq_next, 2267 .stop = dev_seq_stop, 2268 .show = sg_proc_seq_show_devstrs, 2269 }; 2270 2271 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2272 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2273 static const struct file_operations debug_fops = { 2274 .owner = THIS_MODULE, 2275 .open = sg_proc_open_debug, 2276 .read = seq_read, 2277 .llseek = seq_lseek, 2278 .release = seq_release, 2279 }; 2280 static const struct seq_operations debug_seq_ops = { 2281 .start = dev_seq_start, 2282 .next = dev_seq_next, 2283 .stop = dev_seq_stop, 2284 .show = sg_proc_seq_show_debug, 2285 }; 2286 2287 2288 struct sg_proc_leaf { 2289 const char * name; 2290 const struct file_operations * fops; 2291 }; 2292 2293 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2294 {"allow_dio", &adio_fops}, 2295 {"debug", &debug_fops}, 2296 {"def_reserved_size", &dressz_fops}, 2297 {"device_hdr", &devhdr_fops}, 2298 {"devices", &dev_fops}, 2299 {"device_strs", &devstrs_fops}, 2300 {"version", &version_fops} 2301 }; 2302 2303 static int 2304 sg_proc_init(void) 2305 { 2306 int k, mask; 2307 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2308 struct sg_proc_leaf * leaf; 2309 2310 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2311 if (!sg_proc_sgp) 2312 return 1; 2313 for (k = 0; k < num_leaves; ++k) { 2314 leaf = &sg_proc_leaf_arr[k]; 2315 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2316 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); 2317 } 2318 return 0; 2319 } 2320 2321 static void 2322 sg_proc_cleanup(void) 2323 { 2324 int k; 2325 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2326 2327 if (!sg_proc_sgp) 2328 return; 2329 for (k = 0; k < num_leaves; ++k) 2330 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2331 remove_proc_entry(sg_proc_sg_dirname, NULL); 2332 } 2333 2334 2335 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2336 { 2337 seq_printf(s, "%d\n", *((int *)s->private)); 2338 return 0; 2339 } 2340 2341 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2342 { 2343 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2344 } 2345 2346 static ssize_t 2347 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2348 size_t count, loff_t *off) 2349 { 2350 int num; 2351 char buff[11]; 2352 2353 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2354 return -EACCES; 2355 num = (count < 10) ? count : 10; 2356 if (copy_from_user(buff, buffer, num)) 2357 return -EFAULT; 2358 buff[num] = '\0'; 2359 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2360 return count; 2361 } 2362 2363 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2364 { 2365 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2366 } 2367 2368 static ssize_t 2369 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2370 size_t count, loff_t *off) 2371 { 2372 int num; 2373 unsigned long k = ULONG_MAX; 2374 char buff[11]; 2375 2376 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2377 return -EACCES; 2378 num = (count < 10) ? count : 10; 2379 if (copy_from_user(buff, buffer, num)) 2380 return -EFAULT; 2381 buff[num] = '\0'; 2382 k = simple_strtoul(buff, NULL, 10); 2383 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2384 sg_big_buff = k; 2385 return count; 2386 } 2387 return -ERANGE; 2388 } 2389 2390 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2391 { 2392 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2393 sg_version_date); 2394 return 0; 2395 } 2396 2397 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2398 { 2399 return single_open(file, sg_proc_seq_show_version, NULL); 2400 } 2401 2402 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2403 { 2404 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2405 "online\n"); 2406 return 0; 2407 } 2408 2409 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2410 { 2411 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2412 } 2413 2414 struct sg_proc_deviter { 2415 loff_t index; 2416 size_t max; 2417 }; 2418 2419 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2420 { 2421 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2422 2423 s->private = it; 2424 if (! it) 2425 return NULL; 2426 2427 it->index = *pos; 2428 it->max = sg_last_dev(); 2429 if (it->index >= it->max) 2430 return NULL; 2431 return it; 2432 } 2433 2434 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2435 { 2436 struct sg_proc_deviter * it = s->private; 2437 2438 *pos = ++it->index; 2439 return (it->index < it->max) ? it : NULL; 2440 } 2441 2442 static void dev_seq_stop(struct seq_file *s, void *v) 2443 { 2444 kfree(s->private); 2445 } 2446 2447 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2448 { 2449 return seq_open(file, &dev_seq_ops); 2450 } 2451 2452 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2453 { 2454 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2455 Sg_device *sdp; 2456 struct scsi_device *scsidp; 2457 unsigned long iflags; 2458 2459 read_lock_irqsave(&sg_index_lock, iflags); 2460 sdp = it ? sg_lookup_dev(it->index) : NULL; 2461 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2462 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2463 scsidp->host->host_no, scsidp->channel, 2464 scsidp->id, scsidp->lun, (int) scsidp->type, 2465 1, 2466 (int) scsidp->queue_depth, 2467 (int) scsidp->device_busy, 2468 (int) scsi_device_online(scsidp)); 2469 else 2470 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2471 read_unlock_irqrestore(&sg_index_lock, iflags); 2472 return 0; 2473 } 2474 2475 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2476 { 2477 return seq_open(file, &devstrs_seq_ops); 2478 } 2479 2480 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2481 { 2482 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2483 Sg_device *sdp; 2484 struct scsi_device *scsidp; 2485 unsigned long iflags; 2486 2487 read_lock_irqsave(&sg_index_lock, iflags); 2488 sdp = it ? sg_lookup_dev(it->index) : NULL; 2489 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2490 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2491 scsidp->vendor, scsidp->model, scsidp->rev); 2492 else 2493 seq_printf(s, "<no active device>\n"); 2494 read_unlock_irqrestore(&sg_index_lock, iflags); 2495 return 0; 2496 } 2497 2498 /* must be called while holding sg_index_lock */ 2499 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2500 { 2501 int k, m, new_interface, blen, usg; 2502 Sg_request *srp; 2503 Sg_fd *fp; 2504 const sg_io_hdr_t *hp; 2505 const char * cp; 2506 unsigned int ms; 2507 2508 k = 0; 2509 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { 2510 k++; 2511 read_lock(&fp->rq_list_lock); /* irqs already disabled */ 2512 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2513 "(res)sgat=%d low_dma=%d\n", k, 2514 jiffies_to_msecs(fp->timeout), 2515 fp->reserve.bufflen, 2516 (int) fp->reserve.k_use_sg, 2517 (int) fp->low_dma); 2518 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2519 (int) fp->cmd_q, (int) fp->force_packid, 2520 (int) fp->keep_orphan, (int) fp->closed); 2521 for (m = 0, srp = fp->headrp; 2522 srp != NULL; 2523 ++m, srp = srp->nextrp) { 2524 hp = &srp->header; 2525 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2526 if (srp->res_used) { 2527 if (new_interface && 2528 (SG_FLAG_MMAP_IO & hp->flags)) 2529 cp = " mmap>> "; 2530 else 2531 cp = " rb>> "; 2532 } else { 2533 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2534 cp = " dio>> "; 2535 else 2536 cp = " "; 2537 } 2538 seq_printf(s, cp); 2539 blen = srp->data.bufflen; 2540 usg = srp->data.k_use_sg; 2541 seq_printf(s, srp->done ? 2542 ((1 == srp->done) ? "rcv:" : "fin:") 2543 : "act:"); 2544 seq_printf(s, " id=%d blen=%d", 2545 srp->header.pack_id, blen); 2546 if (srp->done) 2547 seq_printf(s, " dur=%d", hp->duration); 2548 else { 2549 ms = jiffies_to_msecs(jiffies); 2550 seq_printf(s, " t_o/elap=%d/%d", 2551 (new_interface ? hp->timeout : 2552 jiffies_to_msecs(fp->timeout)), 2553 (ms > hp->duration ? ms - hp->duration : 0)); 2554 } 2555 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2556 (int) srp->data.cmd_opcode); 2557 } 2558 if (0 == m) 2559 seq_printf(s, " No requests active\n"); 2560 read_unlock(&fp->rq_list_lock); 2561 } 2562 } 2563 2564 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2565 { 2566 return seq_open(file, &debug_seq_ops); 2567 } 2568 2569 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2570 { 2571 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2572 Sg_device *sdp; 2573 unsigned long iflags; 2574 2575 if (it && (0 == it->index)) { 2576 seq_printf(s, "max_active_device=%d(origin 1)\n", 2577 (int)it->max); 2578 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2579 } 2580 2581 read_lock_irqsave(&sg_index_lock, iflags); 2582 sdp = it ? sg_lookup_dev(it->index) : NULL; 2583 if (sdp && !list_empty(&sdp->sfds)) { 2584 struct scsi_device *scsidp = sdp->device; 2585 2586 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); 2587 if (sdp->detached) 2588 seq_printf(s, "detached pending close "); 2589 else 2590 seq_printf 2591 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2592 scsidp->host->host_no, 2593 scsidp->channel, scsidp->id, 2594 scsidp->lun, 2595 scsidp->host->hostt->emulated); 2596 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2597 sdp->sg_tablesize, sdp->exclude); 2598 sg_proc_debug_helper(s, sdp); 2599 } 2600 read_unlock_irqrestore(&sg_index_lock, iflags); 2601 return 0; 2602 } 2603 2604 #endif /* CONFIG_SCSI_PROC_FS */ 2605 2606 module_init(init_sg); 2607 module_exit(exit_sg); 2608