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 void sg_finish_rem_req(Sg_request * srp); 183 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 184 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 185 Sg_request * srp); 186 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, 187 const char __user *buf, size_t count, int blocking, 188 int read_only, int sg_io_owned, Sg_request **o_srp); 189 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 190 unsigned char *cmnd, int timeout, int blocking); 191 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 192 static void sg_remove_scat(Sg_scatter_hold * schp); 193 static void sg_build_reserve(Sg_fd * sfp, int req_size); 194 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 195 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 196 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 197 static void sg_remove_sfp(struct kref *); 198 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 199 static Sg_request *sg_add_request(Sg_fd * sfp); 200 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 201 static int sg_res_in_use(Sg_fd * sfp); 202 static Sg_device *sg_get_dev(int dev); 203 static void sg_put_dev(Sg_device *sdp); 204 205 #define SZ_SG_HEADER sizeof(struct sg_header) 206 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 207 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 208 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 209 210 static int sg_allow_access(struct file *filp, unsigned char *cmd) 211 { 212 struct sg_fd *sfp = (struct sg_fd *)filp->private_data; 213 struct request_queue *q = sfp->parentdp->device->request_queue; 214 215 if (sfp->parentdp->device->type == TYPE_SCANNER) 216 return 0; 217 218 return blk_verify_command(&q->cmd_filter, 219 cmd, filp->f_mode & FMODE_WRITE); 220 } 221 222 static int 223 sg_open(struct inode *inode, struct file *filp) 224 { 225 int dev = iminor(inode); 226 int flags = filp->f_flags; 227 struct request_queue *q; 228 Sg_device *sdp; 229 Sg_fd *sfp; 230 int res; 231 int retval; 232 233 lock_kernel(); 234 nonseekable_open(inode, filp); 235 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 236 sdp = sg_get_dev(dev); 237 if (IS_ERR(sdp)) { 238 retval = PTR_ERR(sdp); 239 sdp = NULL; 240 goto sg_put; 241 } 242 243 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 244 /* Prevent the device driver from vanishing while we sleep */ 245 retval = scsi_device_get(sdp->device); 246 if (retval) 247 goto sg_put; 248 249 if (!((flags & O_NONBLOCK) || 250 scsi_block_when_processing_errors(sdp->device))) { 251 retval = -ENXIO; 252 /* we are in error recovery for this device */ 253 goto error_out; 254 } 255 256 if (flags & O_EXCL) { 257 if (O_RDONLY == (flags & O_ACCMODE)) { 258 retval = -EPERM; /* Can't lock it with read only access */ 259 goto error_out; 260 } 261 if (!list_empty(&sdp->sfds) && (flags & O_NONBLOCK)) { 262 retval = -EBUSY; 263 goto error_out; 264 } 265 res = 0; 266 __wait_event_interruptible(sdp->o_excl_wait, 267 ((!list_empty(&sdp->sfds) || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); 268 if (res) { 269 retval = res; /* -ERESTARTSYS because signal hit process */ 270 goto error_out; 271 } 272 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ 273 if (flags & O_NONBLOCK) { 274 retval = -EBUSY; 275 goto error_out; 276 } 277 res = 0; 278 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), 279 res); 280 if (res) { 281 retval = res; /* -ERESTARTSYS because signal hit process */ 282 goto error_out; 283 } 284 } 285 if (sdp->detached) { 286 retval = -ENODEV; 287 goto error_out; 288 } 289 if (list_empty(&sdp->sfds)) { /* no existing opens on this device */ 290 sdp->sgdebug = 0; 291 q = sdp->device->request_queue; 292 sdp->sg_tablesize = min(q->max_hw_segments, 293 q->max_phys_segments); 294 } 295 if ((sfp = sg_add_sfp(sdp, dev))) 296 filp->private_data = sfp; 297 else { 298 if (flags & O_EXCL) { 299 sdp->exclude = 0; /* undo if error */ 300 wake_up_interruptible(&sdp->o_excl_wait); 301 } 302 retval = -ENOMEM; 303 goto error_out; 304 } 305 retval = 0; 306 error_out: 307 if (retval) 308 scsi_device_put(sdp->device); 309 sg_put: 310 if (sdp) 311 sg_put_dev(sdp); 312 unlock_kernel(); 313 return retval; 314 } 315 316 /* Following function was formerly called 'sg_close' */ 317 static int 318 sg_release(struct inode *inode, struct file *filp) 319 { 320 Sg_device *sdp; 321 Sg_fd *sfp; 322 323 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 324 return -ENXIO; 325 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 326 327 sfp->closed = 1; 328 329 sdp->exclude = 0; 330 wake_up_interruptible(&sdp->o_excl_wait); 331 332 kref_put(&sfp->f_ref, sg_remove_sfp); 333 return 0; 334 } 335 336 static ssize_t 337 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 338 { 339 Sg_device *sdp; 340 Sg_fd *sfp; 341 Sg_request *srp; 342 int req_pack_id = -1; 343 sg_io_hdr_t *hp; 344 struct sg_header *old_hdr = NULL; 345 int retval = 0; 346 347 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 348 return -ENXIO; 349 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 350 sdp->disk->disk_name, (int) count)); 351 352 if (!access_ok(VERIFY_WRITE, buf, count)) 353 return -EFAULT; 354 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 355 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 356 if (!old_hdr) 357 return -ENOMEM; 358 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 359 retval = -EFAULT; 360 goto free_old_hdr; 361 } 362 if (old_hdr->reply_len < 0) { 363 if (count >= SZ_SG_IO_HDR) { 364 sg_io_hdr_t *new_hdr; 365 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 366 if (!new_hdr) { 367 retval = -ENOMEM; 368 goto free_old_hdr; 369 } 370 retval =__copy_from_user 371 (new_hdr, buf, SZ_SG_IO_HDR); 372 req_pack_id = new_hdr->pack_id; 373 kfree(new_hdr); 374 if (retval) { 375 retval = -EFAULT; 376 goto free_old_hdr; 377 } 378 } 379 } else 380 req_pack_id = old_hdr->pack_id; 381 } 382 srp = sg_get_rq_mark(sfp, req_pack_id); 383 if (!srp) { /* now wait on packet to arrive */ 384 if (sdp->detached) { 385 retval = -ENODEV; 386 goto free_old_hdr; 387 } 388 if (filp->f_flags & O_NONBLOCK) { 389 retval = -EAGAIN; 390 goto free_old_hdr; 391 } 392 while (1) { 393 retval = 0; /* following macro beats race condition */ 394 __wait_event_interruptible(sfp->read_wait, 395 (sdp->detached || 396 (srp = sg_get_rq_mark(sfp, req_pack_id))), 397 retval); 398 if (sdp->detached) { 399 retval = -ENODEV; 400 goto free_old_hdr; 401 } 402 if (0 == retval) 403 break; 404 405 /* -ERESTARTSYS as signal hit process */ 406 goto free_old_hdr; 407 } 408 } 409 if (srp->header.interface_id != '\0') { 410 retval = sg_new_read(sfp, buf, count, srp); 411 goto free_old_hdr; 412 } 413 414 hp = &srp->header; 415 if (old_hdr == NULL) { 416 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 417 if (! old_hdr) { 418 retval = -ENOMEM; 419 goto free_old_hdr; 420 } 421 } 422 memset(old_hdr, 0, SZ_SG_HEADER); 423 old_hdr->reply_len = (int) hp->timeout; 424 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 425 old_hdr->pack_id = hp->pack_id; 426 old_hdr->twelve_byte = 427 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 428 old_hdr->target_status = hp->masked_status; 429 old_hdr->host_status = hp->host_status; 430 old_hdr->driver_status = hp->driver_status; 431 if ((CHECK_CONDITION & hp->masked_status) || 432 (DRIVER_SENSE & hp->driver_status)) 433 memcpy(old_hdr->sense_buffer, srp->sense_b, 434 sizeof (old_hdr->sense_buffer)); 435 switch (hp->host_status) { 436 /* This setup of 'result' is for backward compatibility and is best 437 ignored by the user who should use target, host + driver status */ 438 case DID_OK: 439 case DID_PASSTHROUGH: 440 case DID_SOFT_ERROR: 441 old_hdr->result = 0; 442 break; 443 case DID_NO_CONNECT: 444 case DID_BUS_BUSY: 445 case DID_TIME_OUT: 446 old_hdr->result = EBUSY; 447 break; 448 case DID_BAD_TARGET: 449 case DID_ABORT: 450 case DID_PARITY: 451 case DID_RESET: 452 case DID_BAD_INTR: 453 old_hdr->result = EIO; 454 break; 455 case DID_ERROR: 456 old_hdr->result = (srp->sense_b[0] == 0 && 457 hp->masked_status == GOOD) ? 0 : EIO; 458 break; 459 default: 460 old_hdr->result = EIO; 461 break; 462 } 463 464 /* Now copy the result back to the user buffer. */ 465 if (count >= SZ_SG_HEADER) { 466 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 467 retval = -EFAULT; 468 goto free_old_hdr; 469 } 470 buf += SZ_SG_HEADER; 471 if (count > old_hdr->reply_len) 472 count = old_hdr->reply_len; 473 if (count > SZ_SG_HEADER) { 474 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 475 retval = -EFAULT; 476 goto free_old_hdr; 477 } 478 } 479 } else 480 count = (old_hdr->result == 0) ? 0 : -EIO; 481 sg_finish_rem_req(srp); 482 retval = count; 483 free_old_hdr: 484 kfree(old_hdr); 485 return retval; 486 } 487 488 static ssize_t 489 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 490 { 491 sg_io_hdr_t *hp = &srp->header; 492 int err = 0; 493 int len; 494 495 if (count < SZ_SG_IO_HDR) { 496 err = -EINVAL; 497 goto err_out; 498 } 499 hp->sb_len_wr = 0; 500 if ((hp->mx_sb_len > 0) && hp->sbp) { 501 if ((CHECK_CONDITION & hp->masked_status) || 502 (DRIVER_SENSE & hp->driver_status)) { 503 int sb_len = SCSI_SENSE_BUFFERSIZE; 504 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 505 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 506 len = (len > sb_len) ? sb_len : len; 507 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 508 err = -EFAULT; 509 goto err_out; 510 } 511 hp->sb_len_wr = len; 512 } 513 } 514 if (hp->masked_status || hp->host_status || hp->driver_status) 515 hp->info |= SG_INFO_CHECK; 516 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 517 err = -EFAULT; 518 goto err_out; 519 } 520 err_out: 521 sg_finish_rem_req(srp); 522 return (0 == err) ? count : err; 523 } 524 525 static ssize_t 526 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 527 { 528 int mxsize, cmd_size, k; 529 int input_size, blocking; 530 unsigned char opcode; 531 Sg_device *sdp; 532 Sg_fd *sfp; 533 Sg_request *srp; 534 struct sg_header old_hdr; 535 sg_io_hdr_t *hp; 536 unsigned char cmnd[MAX_COMMAND_SIZE]; 537 538 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 539 return -ENXIO; 540 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 541 sdp->disk->disk_name, (int) count)); 542 if (sdp->detached) 543 return -ENODEV; 544 if (!((filp->f_flags & O_NONBLOCK) || 545 scsi_block_when_processing_errors(sdp->device))) 546 return -ENXIO; 547 548 if (!access_ok(VERIFY_READ, buf, count)) 549 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 550 if (count < SZ_SG_HEADER) 551 return -EIO; 552 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 553 return -EFAULT; 554 blocking = !(filp->f_flags & O_NONBLOCK); 555 if (old_hdr.reply_len < 0) 556 return sg_new_write(sfp, filp, buf, count, 557 blocking, 0, 0, NULL); 558 if (count < (SZ_SG_HEADER + 6)) 559 return -EIO; /* The minimum scsi command length is 6 bytes. */ 560 561 if (!(srp = sg_add_request(sfp))) { 562 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 563 return -EDOM; 564 } 565 buf += SZ_SG_HEADER; 566 __get_user(opcode, buf); 567 if (sfp->next_cmd_len > 0) { 568 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 569 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 570 sfp->next_cmd_len = 0; 571 sg_remove_request(sfp, srp); 572 return -EIO; 573 } 574 cmd_size = sfp->next_cmd_len; 575 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 576 } else { 577 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 578 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 579 cmd_size = 12; 580 } 581 SCSI_LOG_TIMEOUT(4, printk( 582 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 583 /* Determine buffer size. */ 584 input_size = count - cmd_size; 585 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 586 mxsize -= SZ_SG_HEADER; 587 input_size -= SZ_SG_HEADER; 588 if (input_size < 0) { 589 sg_remove_request(sfp, srp); 590 return -EIO; /* User did not pass enough bytes for this command. */ 591 } 592 hp = &srp->header; 593 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 594 hp->cmd_len = (unsigned char) cmd_size; 595 hp->iovec_count = 0; 596 hp->mx_sb_len = 0; 597 if (input_size > 0) 598 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 599 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 600 else 601 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 602 hp->dxfer_len = mxsize; 603 if (hp->dxfer_direction == SG_DXFER_TO_DEV) 604 hp->dxferp = (char __user *)buf + cmd_size; 605 else 606 hp->dxferp = NULL; 607 hp->sbp = NULL; 608 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 609 hp->flags = input_size; /* structure abuse ... */ 610 hp->pack_id = old_hdr.pack_id; 611 hp->usr_ptr = NULL; 612 if (__copy_from_user(cmnd, buf, cmd_size)) 613 return -EFAULT; 614 /* 615 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 616 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 617 * is a non-zero input_size, so emit a warning. 618 */ 619 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { 620 static char cmd[TASK_COMM_LEN]; 621 if (strcmp(current->comm, cmd) && printk_ratelimit()) { 622 printk(KERN_WARNING 623 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" 624 "guessing data in;\n" KERN_WARNING " " 625 "program %s not setting count and/or reply_len properly\n", 626 old_hdr.reply_len - (int)SZ_SG_HEADER, 627 input_size, (unsigned int) cmnd[0], 628 current->comm); 629 strcpy(cmd, current->comm); 630 } 631 } 632 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 633 return (k < 0) ? k : count; 634 } 635 636 static ssize_t 637 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, 638 size_t count, int blocking, int read_only, int sg_io_owned, 639 Sg_request **o_srp) 640 { 641 int k; 642 Sg_request *srp; 643 sg_io_hdr_t *hp; 644 unsigned char cmnd[MAX_COMMAND_SIZE]; 645 int timeout; 646 unsigned long ul_timeout; 647 648 if (count < SZ_SG_IO_HDR) 649 return -EINVAL; 650 if (!access_ok(VERIFY_READ, buf, count)) 651 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 652 653 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 654 if (!(srp = sg_add_request(sfp))) { 655 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 656 return -EDOM; 657 } 658 srp->sg_io_owned = sg_io_owned; 659 hp = &srp->header; 660 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 661 sg_remove_request(sfp, srp); 662 return -EFAULT; 663 } 664 if (hp->interface_id != 'S') { 665 sg_remove_request(sfp, srp); 666 return -ENOSYS; 667 } 668 if (hp->flags & SG_FLAG_MMAP_IO) { 669 if (hp->dxfer_len > sfp->reserve.bufflen) { 670 sg_remove_request(sfp, srp); 671 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 672 } 673 if (hp->flags & SG_FLAG_DIRECT_IO) { 674 sg_remove_request(sfp, srp); 675 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 676 } 677 if (sg_res_in_use(sfp)) { 678 sg_remove_request(sfp, srp); 679 return -EBUSY; /* reserve buffer already being used */ 680 } 681 } 682 ul_timeout = msecs_to_jiffies(srp->header.timeout); 683 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 684 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 685 sg_remove_request(sfp, srp); 686 return -EMSGSIZE; 687 } 688 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 689 sg_remove_request(sfp, srp); 690 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 691 } 692 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 693 sg_remove_request(sfp, srp); 694 return -EFAULT; 695 } 696 if (read_only && sg_allow_access(file, cmnd)) { 697 sg_remove_request(sfp, srp); 698 return -EPERM; 699 } 700 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 701 if (k < 0) 702 return k; 703 if (o_srp) 704 *o_srp = srp; 705 return count; 706 } 707 708 static int 709 sg_common_write(Sg_fd * sfp, Sg_request * srp, 710 unsigned char *cmnd, int timeout, int blocking) 711 { 712 int k, data_dir; 713 Sg_device *sdp = sfp->parentdp; 714 sg_io_hdr_t *hp = &srp->header; 715 716 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 717 hp->status = 0; 718 hp->masked_status = 0; 719 hp->msg_status = 0; 720 hp->info = 0; 721 hp->host_status = 0; 722 hp->driver_status = 0; 723 hp->resid = 0; 724 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 725 (int) cmnd[0], (int) hp->cmd_len)); 726 727 k = sg_start_req(srp, cmnd); 728 if (k) { 729 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); 730 sg_finish_rem_req(srp); 731 return k; /* probably out of space --> ENOMEM */ 732 } 733 if (sdp->detached) { 734 sg_finish_rem_req(srp); 735 return -ENODEV; 736 } 737 738 switch (hp->dxfer_direction) { 739 case SG_DXFER_TO_FROM_DEV: 740 case SG_DXFER_FROM_DEV: 741 data_dir = DMA_FROM_DEVICE; 742 break; 743 case SG_DXFER_TO_DEV: 744 data_dir = DMA_TO_DEVICE; 745 break; 746 case SG_DXFER_UNKNOWN: 747 data_dir = DMA_BIDIRECTIONAL; 748 break; 749 default: 750 data_dir = DMA_NONE; 751 break; 752 } 753 hp->duration = jiffies_to_msecs(jiffies); 754 755 srp->rq->timeout = timeout; 756 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ 757 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, 758 srp->rq, 1, sg_rq_end_io); 759 return 0; 760 } 761 762 static int 763 sg_ioctl(struct inode *inode, struct file *filp, 764 unsigned int cmd_in, unsigned long arg) 765 { 766 void __user *p = (void __user *)arg; 767 int __user *ip = p; 768 int result, val, read_only; 769 Sg_device *sdp; 770 Sg_fd *sfp; 771 Sg_request *srp; 772 unsigned long iflags; 773 774 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 775 return -ENXIO; 776 777 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 778 sdp->disk->disk_name, (int) cmd_in)); 779 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 780 781 switch (cmd_in) { 782 case SG_IO: 783 { 784 int blocking = 1; /* ignore O_NONBLOCK flag */ 785 786 if (sdp->detached) 787 return -ENODEV; 788 if (!scsi_block_when_processing_errors(sdp->device)) 789 return -ENXIO; 790 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 791 return -EFAULT; 792 result = 793 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, 794 blocking, read_only, 1, &srp); 795 if (result < 0) 796 return result; 797 while (1) { 798 result = 0; /* following macro to beat race condition */ 799 __wait_event_interruptible(sfp->read_wait, 800 (srp->done || sdp->detached), 801 result); 802 if (sdp->detached) 803 return -ENODEV; 804 write_lock_irq(&sfp->rq_list_lock); 805 if (srp->done) { 806 srp->done = 2; 807 write_unlock_irq(&sfp->rq_list_lock); 808 break; 809 } 810 srp->orphan = 1; 811 write_unlock_irq(&sfp->rq_list_lock); 812 return result; /* -ERESTARTSYS because signal hit process */ 813 } 814 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 815 return (result < 0) ? result : 0; 816 } 817 case SG_SET_TIMEOUT: 818 result = get_user(val, ip); 819 if (result) 820 return result; 821 if (val < 0) 822 return -EIO; 823 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 824 val = MULDIV (INT_MAX, USER_HZ, HZ); 825 sfp->timeout_user = val; 826 sfp->timeout = MULDIV (val, HZ, USER_HZ); 827 828 return 0; 829 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 830 /* strange ..., for backward compatibility */ 831 return sfp->timeout_user; 832 case SG_SET_FORCE_LOW_DMA: 833 result = get_user(val, ip); 834 if (result) 835 return result; 836 if (val) { 837 sfp->low_dma = 1; 838 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 839 val = (int) sfp->reserve.bufflen; 840 sg_remove_scat(&sfp->reserve); 841 sg_build_reserve(sfp, val); 842 } 843 } else { 844 if (sdp->detached) 845 return -ENODEV; 846 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 847 } 848 return 0; 849 case SG_GET_LOW_DMA: 850 return put_user((int) sfp->low_dma, ip); 851 case SG_GET_SCSI_ID: 852 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 853 return -EFAULT; 854 else { 855 sg_scsi_id_t __user *sg_idp = p; 856 857 if (sdp->detached) 858 return -ENODEV; 859 __put_user((int) sdp->device->host->host_no, 860 &sg_idp->host_no); 861 __put_user((int) sdp->device->channel, 862 &sg_idp->channel); 863 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 864 __put_user((int) sdp->device->lun, &sg_idp->lun); 865 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 866 __put_user((short) sdp->device->host->cmd_per_lun, 867 &sg_idp->h_cmd_per_lun); 868 __put_user((short) sdp->device->queue_depth, 869 &sg_idp->d_queue_depth); 870 __put_user(0, &sg_idp->unused[0]); 871 __put_user(0, &sg_idp->unused[1]); 872 return 0; 873 } 874 case SG_SET_FORCE_PACK_ID: 875 result = get_user(val, ip); 876 if (result) 877 return result; 878 sfp->force_packid = val ? 1 : 0; 879 return 0; 880 case SG_GET_PACK_ID: 881 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 882 return -EFAULT; 883 read_lock_irqsave(&sfp->rq_list_lock, iflags); 884 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 885 if ((1 == srp->done) && (!srp->sg_io_owned)) { 886 read_unlock_irqrestore(&sfp->rq_list_lock, 887 iflags); 888 __put_user(srp->header.pack_id, ip); 889 return 0; 890 } 891 } 892 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 893 __put_user(-1, ip); 894 return 0; 895 case SG_GET_NUM_WAITING: 896 read_lock_irqsave(&sfp->rq_list_lock, iflags); 897 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 898 if ((1 == srp->done) && (!srp->sg_io_owned)) 899 ++val; 900 } 901 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 902 return put_user(val, ip); 903 case SG_GET_SG_TABLESIZE: 904 return put_user(sdp->sg_tablesize, ip); 905 case SG_SET_RESERVED_SIZE: 906 result = get_user(val, ip); 907 if (result) 908 return result; 909 if (val < 0) 910 return -EINVAL; 911 val = min_t(int, val, 912 sdp->device->request_queue->max_sectors * 512); 913 if (val != sfp->reserve.bufflen) { 914 if (sg_res_in_use(sfp) || sfp->mmap_called) 915 return -EBUSY; 916 sg_remove_scat(&sfp->reserve); 917 sg_build_reserve(sfp, val); 918 } 919 return 0; 920 case SG_GET_RESERVED_SIZE: 921 val = min_t(int, sfp->reserve.bufflen, 922 sdp->device->request_queue->max_sectors * 512); 923 return put_user(val, ip); 924 case SG_SET_COMMAND_Q: 925 result = get_user(val, ip); 926 if (result) 927 return result; 928 sfp->cmd_q = val ? 1 : 0; 929 return 0; 930 case SG_GET_COMMAND_Q: 931 return put_user((int) sfp->cmd_q, ip); 932 case SG_SET_KEEP_ORPHAN: 933 result = get_user(val, ip); 934 if (result) 935 return result; 936 sfp->keep_orphan = val; 937 return 0; 938 case SG_GET_KEEP_ORPHAN: 939 return put_user((int) sfp->keep_orphan, ip); 940 case SG_NEXT_CMD_LEN: 941 result = get_user(val, ip); 942 if (result) 943 return result; 944 sfp->next_cmd_len = (val > 0) ? val : 0; 945 return 0; 946 case SG_GET_VERSION_NUM: 947 return put_user(sg_version_num, ip); 948 case SG_GET_ACCESS_COUNT: 949 /* faked - we don't have a real access count anymore */ 950 val = (sdp->device ? 1 : 0); 951 return put_user(val, ip); 952 case SG_GET_REQUEST_TABLE: 953 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 954 return -EFAULT; 955 else { 956 sg_req_info_t *rinfo; 957 unsigned int ms; 958 959 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 960 GFP_KERNEL); 961 if (!rinfo) 962 return -ENOMEM; 963 read_lock_irqsave(&sfp->rq_list_lock, iflags); 964 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 965 ++val, srp = srp ? srp->nextrp : srp) { 966 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 967 if (srp) { 968 rinfo[val].req_state = srp->done + 1; 969 rinfo[val].problem = 970 srp->header.masked_status & 971 srp->header.host_status & 972 srp->header.driver_status; 973 if (srp->done) 974 rinfo[val].duration = 975 srp->header.duration; 976 else { 977 ms = jiffies_to_msecs(jiffies); 978 rinfo[val].duration = 979 (ms > srp->header.duration) ? 980 (ms - srp->header.duration) : 0; 981 } 982 rinfo[val].orphan = srp->orphan; 983 rinfo[val].sg_io_owned = 984 srp->sg_io_owned; 985 rinfo[val].pack_id = 986 srp->header.pack_id; 987 rinfo[val].usr_ptr = 988 srp->header.usr_ptr; 989 } 990 } 991 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 992 result = __copy_to_user(p, rinfo, 993 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 994 result = result ? -EFAULT : 0; 995 kfree(rinfo); 996 return result; 997 } 998 case SG_EMULATED_HOST: 999 if (sdp->detached) 1000 return -ENODEV; 1001 return put_user(sdp->device->host->hostt->emulated, ip); 1002 case SG_SCSI_RESET: 1003 if (sdp->detached) 1004 return -ENODEV; 1005 if (filp->f_flags & O_NONBLOCK) { 1006 if (scsi_host_in_recovery(sdp->device->host)) 1007 return -EBUSY; 1008 } else if (!scsi_block_when_processing_errors(sdp->device)) 1009 return -EBUSY; 1010 result = get_user(val, ip); 1011 if (result) 1012 return result; 1013 if (SG_SCSI_RESET_NOTHING == val) 1014 return 0; 1015 switch (val) { 1016 case SG_SCSI_RESET_DEVICE: 1017 val = SCSI_TRY_RESET_DEVICE; 1018 break; 1019 case SG_SCSI_RESET_TARGET: 1020 val = SCSI_TRY_RESET_TARGET; 1021 break; 1022 case SG_SCSI_RESET_BUS: 1023 val = SCSI_TRY_RESET_BUS; 1024 break; 1025 case SG_SCSI_RESET_HOST: 1026 val = SCSI_TRY_RESET_HOST; 1027 break; 1028 default: 1029 return -EINVAL; 1030 } 1031 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1032 return -EACCES; 1033 return (scsi_reset_provider(sdp->device, val) == 1034 SUCCESS) ? 0 : -EIO; 1035 case SCSI_IOCTL_SEND_COMMAND: 1036 if (sdp->detached) 1037 return -ENODEV; 1038 if (read_only) { 1039 unsigned char opcode = WRITE_6; 1040 Scsi_Ioctl_Command __user *siocp = p; 1041 1042 if (copy_from_user(&opcode, siocp->data, 1)) 1043 return -EFAULT; 1044 if (sg_allow_access(filp, &opcode)) 1045 return -EPERM; 1046 } 1047 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); 1048 case SG_SET_DEBUG: 1049 result = get_user(val, ip); 1050 if (result) 1051 return result; 1052 sdp->sgdebug = (char) val; 1053 return 0; 1054 case SCSI_IOCTL_GET_IDLUN: 1055 case SCSI_IOCTL_GET_BUS_NUMBER: 1056 case SCSI_IOCTL_PROBE_HOST: 1057 case SG_GET_TRANSFORM: 1058 if (sdp->detached) 1059 return -ENODEV; 1060 return scsi_ioctl(sdp->device, cmd_in, p); 1061 case BLKSECTGET: 1062 return put_user(sdp->device->request_queue->max_sectors * 512, 1063 ip); 1064 case BLKTRACESETUP: 1065 return blk_trace_setup(sdp->device->request_queue, 1066 sdp->disk->disk_name, 1067 MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1068 (char *)arg); 1069 case BLKTRACESTART: 1070 return blk_trace_startstop(sdp->device->request_queue, 1); 1071 case BLKTRACESTOP: 1072 return blk_trace_startstop(sdp->device->request_queue, 0); 1073 case BLKTRACETEARDOWN: 1074 return blk_trace_remove(sdp->device->request_queue); 1075 default: 1076 if (read_only) 1077 return -EPERM; /* don't know so take safe approach */ 1078 return scsi_ioctl(sdp->device, cmd_in, p); 1079 } 1080 } 1081 1082 #ifdef CONFIG_COMPAT 1083 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1084 { 1085 Sg_device *sdp; 1086 Sg_fd *sfp; 1087 struct scsi_device *sdev; 1088 1089 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1090 return -ENXIO; 1091 1092 sdev = sdp->device; 1093 if (sdev->host->hostt->compat_ioctl) { 1094 int ret; 1095 1096 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1097 1098 return ret; 1099 } 1100 1101 return -ENOIOCTLCMD; 1102 } 1103 #endif 1104 1105 static unsigned int 1106 sg_poll(struct file *filp, poll_table * wait) 1107 { 1108 unsigned int res = 0; 1109 Sg_device *sdp; 1110 Sg_fd *sfp; 1111 Sg_request *srp; 1112 int count = 0; 1113 unsigned long iflags; 1114 1115 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) 1116 || sfp->closed) 1117 return POLLERR; 1118 poll_wait(filp, &sfp->read_wait, wait); 1119 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1120 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1121 /* if any read waiting, flag it */ 1122 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1123 res = POLLIN | POLLRDNORM; 1124 ++count; 1125 } 1126 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1127 1128 if (sdp->detached) 1129 res |= POLLHUP; 1130 else if (!sfp->cmd_q) { 1131 if (0 == count) 1132 res |= POLLOUT | POLLWRNORM; 1133 } else if (count < SG_MAX_QUEUE) 1134 res |= POLLOUT | POLLWRNORM; 1135 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1136 sdp->disk->disk_name, (int) res)); 1137 return res; 1138 } 1139 1140 static int 1141 sg_fasync(int fd, struct file *filp, int mode) 1142 { 1143 Sg_device *sdp; 1144 Sg_fd *sfp; 1145 1146 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1147 return -ENXIO; 1148 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1149 sdp->disk->disk_name, mode)); 1150 1151 return fasync_helper(fd, filp, mode, &sfp->async_qp); 1152 } 1153 1154 static int 1155 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1156 { 1157 Sg_fd *sfp; 1158 unsigned long offset, len, sa; 1159 Sg_scatter_hold *rsv_schp; 1160 int k, length; 1161 1162 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1163 return VM_FAULT_SIGBUS; 1164 rsv_schp = &sfp->reserve; 1165 offset = vmf->pgoff << PAGE_SHIFT; 1166 if (offset >= rsv_schp->bufflen) 1167 return VM_FAULT_SIGBUS; 1168 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", 1169 offset, rsv_schp->k_use_sg)); 1170 sa = vma->vm_start; 1171 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1172 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1173 len = vma->vm_end - sa; 1174 len = (len < length) ? len : length; 1175 if (offset < len) { 1176 struct page *page = nth_page(rsv_schp->pages[k], 1177 offset >> PAGE_SHIFT); 1178 get_page(page); /* increment page count */ 1179 vmf->page = page; 1180 return 0; /* success */ 1181 } 1182 sa += len; 1183 offset -= len; 1184 } 1185 1186 return VM_FAULT_SIGBUS; 1187 } 1188 1189 static struct vm_operations_struct sg_mmap_vm_ops = { 1190 .fault = sg_vma_fault, 1191 }; 1192 1193 static int 1194 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1195 { 1196 Sg_fd *sfp; 1197 unsigned long req_sz, len, sa; 1198 Sg_scatter_hold *rsv_schp; 1199 int k, length; 1200 1201 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1202 return -ENXIO; 1203 req_sz = vma->vm_end - vma->vm_start; 1204 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1205 (void *) vma->vm_start, (int) req_sz)); 1206 if (vma->vm_pgoff) 1207 return -EINVAL; /* want no offset */ 1208 rsv_schp = &sfp->reserve; 1209 if (req_sz > rsv_schp->bufflen) 1210 return -ENOMEM; /* cannot map more than reserved buffer */ 1211 1212 sa = vma->vm_start; 1213 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1214 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1215 len = vma->vm_end - sa; 1216 len = (len < length) ? len : length; 1217 sa += len; 1218 } 1219 1220 sfp->mmap_called = 1; 1221 vma->vm_flags |= VM_RESERVED; 1222 vma->vm_private_data = sfp; 1223 vma->vm_ops = &sg_mmap_vm_ops; 1224 return 0; 1225 } 1226 1227 static void sg_rq_end_io_usercontext(struct work_struct *work) 1228 { 1229 struct sg_request *srp = container_of(work, struct sg_request, ew.work); 1230 struct sg_fd *sfp = srp->parentfp; 1231 1232 sg_finish_rem_req(srp); 1233 kref_put(&sfp->f_ref, sg_remove_sfp); 1234 } 1235 1236 /* 1237 * This function is a "bottom half" handler that is called by the mid 1238 * level when a command is completed (or has failed). 1239 */ 1240 static void sg_rq_end_io(struct request *rq, int uptodate) 1241 { 1242 struct sg_request *srp = rq->end_io_data; 1243 Sg_device *sdp; 1244 Sg_fd *sfp; 1245 unsigned long iflags; 1246 unsigned int ms; 1247 char *sense; 1248 int result, resid, done = 1; 1249 1250 if (WARN_ON(srp->done != 0)) 1251 return; 1252 1253 sfp = srp->parentfp; 1254 if (WARN_ON(sfp == NULL)) 1255 return; 1256 1257 sdp = sfp->parentdp; 1258 if (unlikely(sdp->detached)) 1259 printk(KERN_INFO "sg_rq_end_io: device detached\n"); 1260 1261 sense = rq->sense; 1262 result = rq->errors; 1263 resid = rq->data_len; 1264 1265 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1266 sdp->disk->disk_name, srp->header.pack_id, result)); 1267 srp->header.resid = resid; 1268 ms = jiffies_to_msecs(jiffies); 1269 srp->header.duration = (ms > srp->header.duration) ? 1270 (ms - srp->header.duration) : 0; 1271 if (0 != result) { 1272 struct scsi_sense_hdr sshdr; 1273 1274 srp->header.status = 0xff & result; 1275 srp->header.masked_status = status_byte(result); 1276 srp->header.msg_status = msg_byte(result); 1277 srp->header.host_status = host_byte(result); 1278 srp->header.driver_status = driver_byte(result); 1279 if ((sdp->sgdebug > 0) && 1280 ((CHECK_CONDITION == srp->header.masked_status) || 1281 (COMMAND_TERMINATED == srp->header.masked_status))) 1282 __scsi_print_sense("sg_cmd_done", sense, 1283 SCSI_SENSE_BUFFERSIZE); 1284 1285 /* Following if statement is a patch supplied by Eric Youngdale */ 1286 if (driver_byte(result) != 0 1287 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1288 && !scsi_sense_is_deferred(&sshdr) 1289 && sshdr.sense_key == UNIT_ATTENTION 1290 && sdp->device->removable) { 1291 /* Detected possible disc change. Set the bit - this */ 1292 /* may be used if there are filesystems using this device */ 1293 sdp->device->changed = 1; 1294 } 1295 } 1296 /* Rely on write phase to clean out srp status values, so no "else" */ 1297 1298 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1299 if (unlikely(srp->orphan)) { 1300 if (sfp->keep_orphan) 1301 srp->sg_io_owned = 0; 1302 else 1303 done = 0; 1304 } 1305 srp->done = done; 1306 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1307 1308 if (likely(done)) { 1309 /* Now wake up any sg_read() that is waiting for this 1310 * packet. 1311 */ 1312 wake_up_interruptible(&sfp->read_wait); 1313 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1314 kref_put(&sfp->f_ref, sg_remove_sfp); 1315 } else 1316 execute_in_process_context(sg_rq_end_io_usercontext, &srp->ew); 1317 } 1318 1319 static 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 = min(q->max_hw_segments, q->max_phys_segments); 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 } 1658 1659 if (iov_count) 1660 res = blk_rq_map_user_iov(q, rq, md, hp->dxferp, iov_count, 1661 hp->dxfer_len, GFP_ATOMIC); 1662 else 1663 res = blk_rq_map_user(q, rq, md, hp->dxferp, 1664 hp->dxfer_len, GFP_ATOMIC); 1665 1666 if (!res) { 1667 srp->bio = rq->bio; 1668 1669 if (!md) { 1670 req_schp->dio_in_use = 1; 1671 hp->info |= SG_INFO_DIRECT_IO; 1672 } 1673 } 1674 return res; 1675 } 1676 1677 static void 1678 sg_finish_rem_req(Sg_request * srp) 1679 { 1680 Sg_fd *sfp = srp->parentfp; 1681 Sg_scatter_hold *req_schp = &srp->data; 1682 1683 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1684 if (srp->res_used) 1685 sg_unlink_reserve(sfp, srp); 1686 else 1687 sg_remove_scat(req_schp); 1688 1689 if (srp->rq) { 1690 if (srp->bio) 1691 blk_rq_unmap_user(srp->bio); 1692 1693 blk_put_request(srp->rq); 1694 } 1695 1696 sg_remove_request(sfp, srp); 1697 } 1698 1699 static int 1700 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1701 { 1702 int sg_bufflen = tablesize * sizeof(struct page *); 1703 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1704 1705 schp->pages = kzalloc(sg_bufflen, gfp_flags); 1706 if (!schp->pages) 1707 return -ENOMEM; 1708 schp->sglist_len = sg_bufflen; 1709 return tablesize; /* number of scat_gath elements allocated */ 1710 } 1711 1712 static int 1713 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1714 { 1715 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; 1716 int sg_tablesize = sfp->parentdp->sg_tablesize; 1717 int blk_size = buff_size, order; 1718 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 1719 1720 if (blk_size < 0) 1721 return -EFAULT; 1722 if (0 == blk_size) 1723 ++blk_size; /* don't know why */ 1724 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1725 blk_size = ALIGN(blk_size, SG_SECTOR_SZ); 1726 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1727 buff_size, blk_size)); 1728 1729 /* N.B. ret_sz carried into this block ... */ 1730 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1731 if (mx_sc_elems < 0) 1732 return mx_sc_elems; /* most likely -ENOMEM */ 1733 1734 num = scatter_elem_sz; 1735 if (unlikely(num != scatter_elem_sz_prev)) { 1736 if (num < PAGE_SIZE) { 1737 scatter_elem_sz = PAGE_SIZE; 1738 scatter_elem_sz_prev = PAGE_SIZE; 1739 } else 1740 scatter_elem_sz_prev = num; 1741 } 1742 1743 if (sfp->low_dma) 1744 gfp_mask |= GFP_DMA; 1745 1746 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1747 gfp_mask |= __GFP_ZERO; 1748 1749 order = get_order(num); 1750 retry: 1751 ret_sz = 1 << (PAGE_SHIFT + order); 1752 1753 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; 1754 k++, rem_sz -= ret_sz) { 1755 1756 num = (rem_sz > scatter_elem_sz_prev) ? 1757 scatter_elem_sz_prev : rem_sz; 1758 1759 schp->pages[k] = alloc_pages(gfp_mask, order); 1760 if (!schp->pages[k]) 1761 goto out; 1762 1763 if (num == scatter_elem_sz_prev) { 1764 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1765 scatter_elem_sz = ret_sz; 1766 scatter_elem_sz_prev = ret_sz; 1767 } 1768 } 1769 1770 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " 1771 "ret_sz=%d\n", k, num, ret_sz)); 1772 } /* end of for loop */ 1773 1774 schp->page_order = order; 1775 schp->k_use_sg = k; 1776 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " 1777 "rem_sz=%d\n", k, rem_sz)); 1778 1779 schp->bufflen = blk_size; 1780 if (rem_sz > 0) /* must have failed */ 1781 return -ENOMEM; 1782 return 0; 1783 out: 1784 for (i = 0; i < k; i++) 1785 __free_pages(schp->pages[k], order); 1786 1787 if (--order >= 0) 1788 goto retry; 1789 1790 return -ENOMEM; 1791 } 1792 1793 static void 1794 sg_remove_scat(Sg_scatter_hold * schp) 1795 { 1796 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1797 if (schp->pages && schp->sglist_len > 0) { 1798 if (!schp->dio_in_use) { 1799 int k; 1800 1801 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1802 SCSI_LOG_TIMEOUT(5, printk( 1803 "sg_remove_scat: k=%d, pg=0x%p\n", 1804 k, schp->pages[k])); 1805 __free_pages(schp->pages[k], schp->page_order); 1806 } 1807 1808 kfree(schp->pages); 1809 } 1810 } 1811 memset(schp, 0, sizeof (*schp)); 1812 } 1813 1814 static int 1815 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 1816 { 1817 Sg_scatter_hold *schp = &srp->data; 1818 int k, num; 1819 1820 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 1821 num_read_xfer)); 1822 if ((!outp) || (num_read_xfer <= 0)) 1823 return 0; 1824 1825 num = 1 << (PAGE_SHIFT + schp->page_order); 1826 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1827 if (num > num_read_xfer) { 1828 if (__copy_to_user(outp, page_address(schp->pages[k]), 1829 num_read_xfer)) 1830 return -EFAULT; 1831 break; 1832 } else { 1833 if (__copy_to_user(outp, page_address(schp->pages[k]), 1834 num)) 1835 return -EFAULT; 1836 num_read_xfer -= num; 1837 if (num_read_xfer <= 0) 1838 break; 1839 outp += num; 1840 } 1841 } 1842 1843 return 0; 1844 } 1845 1846 static void 1847 sg_build_reserve(Sg_fd * sfp, int req_size) 1848 { 1849 Sg_scatter_hold *schp = &sfp->reserve; 1850 1851 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 1852 do { 1853 if (req_size < PAGE_SIZE) 1854 req_size = PAGE_SIZE; 1855 if (0 == sg_build_indirect(schp, sfp, req_size)) 1856 return; 1857 else 1858 sg_remove_scat(schp); 1859 req_size >>= 1; /* divide by 2 */ 1860 } while (req_size > (PAGE_SIZE / 2)); 1861 } 1862 1863 static void 1864 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 1865 { 1866 Sg_scatter_hold *req_schp = &srp->data; 1867 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1868 int k, num, rem; 1869 1870 srp->res_used = 1; 1871 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 1872 rem = size; 1873 1874 num = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1875 for (k = 0; k < rsv_schp->k_use_sg; k++) { 1876 if (rem <= num) { 1877 req_schp->k_use_sg = k + 1; 1878 req_schp->sglist_len = rsv_schp->sglist_len; 1879 req_schp->pages = rsv_schp->pages; 1880 1881 req_schp->bufflen = size; 1882 req_schp->page_order = rsv_schp->page_order; 1883 break; 1884 } else 1885 rem -= num; 1886 } 1887 1888 if (k >= rsv_schp->k_use_sg) 1889 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 1890 } 1891 1892 static void 1893 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 1894 { 1895 Sg_scatter_hold *req_schp = &srp->data; 1896 1897 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 1898 (int) req_schp->k_use_sg)); 1899 req_schp->k_use_sg = 0; 1900 req_schp->bufflen = 0; 1901 req_schp->pages = NULL; 1902 req_schp->page_order = 0; 1903 req_schp->sglist_len = 0; 1904 sfp->save_scat_len = 0; 1905 srp->res_used = 0; 1906 } 1907 1908 static Sg_request * 1909 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 1910 { 1911 Sg_request *resp; 1912 unsigned long iflags; 1913 1914 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1915 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 1916 /* look for requests that are ready + not SG_IO owned */ 1917 if ((1 == resp->done) && (!resp->sg_io_owned) && 1918 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 1919 resp->done = 2; /* guard against other readers */ 1920 break; 1921 } 1922 } 1923 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1924 return resp; 1925 } 1926 1927 /* always adds to end of list */ 1928 static Sg_request * 1929 sg_add_request(Sg_fd * sfp) 1930 { 1931 int k; 1932 unsigned long iflags; 1933 Sg_request *resp; 1934 Sg_request *rp = sfp->req_arr; 1935 1936 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1937 resp = sfp->headrp; 1938 if (!resp) { 1939 memset(rp, 0, sizeof (Sg_request)); 1940 rp->parentfp = sfp; 1941 resp = rp; 1942 sfp->headrp = resp; 1943 } else { 1944 if (0 == sfp->cmd_q) 1945 resp = NULL; /* command queuing disallowed */ 1946 else { 1947 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 1948 if (!rp->parentfp) 1949 break; 1950 } 1951 if (k < SG_MAX_QUEUE) { 1952 memset(rp, 0, sizeof (Sg_request)); 1953 rp->parentfp = sfp; 1954 while (resp->nextrp) 1955 resp = resp->nextrp; 1956 resp->nextrp = rp; 1957 resp = rp; 1958 } else 1959 resp = NULL; 1960 } 1961 } 1962 if (resp) { 1963 resp->nextrp = NULL; 1964 resp->header.duration = jiffies_to_msecs(jiffies); 1965 } 1966 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1967 return resp; 1968 } 1969 1970 /* Return of 1 for found; 0 for not found */ 1971 static int 1972 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 1973 { 1974 Sg_request *prev_rp; 1975 Sg_request *rp; 1976 unsigned long iflags; 1977 int res = 0; 1978 1979 if ((!sfp) || (!srp) || (!sfp->headrp)) 1980 return res; 1981 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1982 prev_rp = sfp->headrp; 1983 if (srp == prev_rp) { 1984 sfp->headrp = prev_rp->nextrp; 1985 prev_rp->parentfp = NULL; 1986 res = 1; 1987 } else { 1988 while ((rp = prev_rp->nextrp)) { 1989 if (srp == rp) { 1990 prev_rp->nextrp = rp->nextrp; 1991 rp->parentfp = NULL; 1992 res = 1; 1993 break; 1994 } 1995 prev_rp = rp; 1996 } 1997 } 1998 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1999 return res; 2000 } 2001 2002 static Sg_fd * 2003 sg_add_sfp(Sg_device * sdp, int dev) 2004 { 2005 Sg_fd *sfp; 2006 unsigned long iflags; 2007 int bufflen; 2008 2009 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2010 if (!sfp) 2011 return NULL; 2012 2013 init_waitqueue_head(&sfp->read_wait); 2014 rwlock_init(&sfp->rq_list_lock); 2015 2016 kref_init(&sfp->f_ref); 2017 sfp->timeout = SG_DEFAULT_TIMEOUT; 2018 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2019 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2020 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2021 sdp->device->host->unchecked_isa_dma : 1; 2022 sfp->cmd_q = SG_DEF_COMMAND_Q; 2023 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2024 sfp->parentdp = sdp; 2025 write_lock_irqsave(&sg_index_lock, iflags); 2026 list_add_tail(&sfp->sfd_siblings, &sdp->sfds); 2027 write_unlock_irqrestore(&sg_index_lock, iflags); 2028 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2029 if (unlikely(sg_big_buff != def_reserved_size)) 2030 sg_big_buff = def_reserved_size; 2031 2032 bufflen = min_t(int, sg_big_buff, 2033 sdp->device->request_queue->max_sectors * 512); 2034 sg_build_reserve(sfp, bufflen); 2035 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2036 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2037 2038 kref_get(&sdp->d_ref); 2039 __module_get(THIS_MODULE); 2040 return sfp; 2041 } 2042 2043 static void sg_remove_sfp_usercontext(struct work_struct *work) 2044 { 2045 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); 2046 struct sg_device *sdp = sfp->parentdp; 2047 2048 /* Cleanup any responses which were never read(). */ 2049 while (sfp->headrp) 2050 sg_finish_rem_req(sfp->headrp); 2051 2052 if (sfp->reserve.bufflen > 0) { 2053 SCSI_LOG_TIMEOUT(6, 2054 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2055 (int) sfp->reserve.bufflen, 2056 (int) sfp->reserve.k_use_sg)); 2057 sg_remove_scat(&sfp->reserve); 2058 } 2059 2060 SCSI_LOG_TIMEOUT(6, 2061 printk("sg_remove_sfp: %s, sfp=0x%p\n", 2062 sdp->disk->disk_name, 2063 sfp)); 2064 kfree(sfp); 2065 2066 scsi_device_put(sdp->device); 2067 sg_put_dev(sdp); 2068 module_put(THIS_MODULE); 2069 } 2070 2071 static void sg_remove_sfp(struct kref *kref) 2072 { 2073 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); 2074 struct sg_device *sdp = sfp->parentdp; 2075 unsigned long iflags; 2076 2077 write_lock_irqsave(&sg_index_lock, iflags); 2078 list_del(&sfp->sfd_siblings); 2079 write_unlock_irqrestore(&sg_index_lock, iflags); 2080 wake_up_interruptible(&sdp->o_excl_wait); 2081 2082 execute_in_process_context(sg_remove_sfp_usercontext, &sfp->ew); 2083 } 2084 2085 static int 2086 sg_res_in_use(Sg_fd * sfp) 2087 { 2088 const Sg_request *srp; 2089 unsigned long iflags; 2090 2091 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2092 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2093 if (srp->res_used) 2094 break; 2095 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2096 return srp ? 1 : 0; 2097 } 2098 2099 #ifdef CONFIG_SCSI_PROC_FS 2100 static int 2101 sg_idr_max_id(int id, void *p, void *data) 2102 { 2103 int *k = data; 2104 2105 if (*k < id) 2106 *k = id; 2107 2108 return 0; 2109 } 2110 2111 static int 2112 sg_last_dev(void) 2113 { 2114 int k = -1; 2115 unsigned long iflags; 2116 2117 read_lock_irqsave(&sg_index_lock, iflags); 2118 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2119 read_unlock_irqrestore(&sg_index_lock, iflags); 2120 return k + 1; /* origin 1 */ 2121 } 2122 #endif 2123 2124 /* must be called with sg_index_lock held */ 2125 static Sg_device *sg_lookup_dev(int dev) 2126 { 2127 return idr_find(&sg_index_idr, dev); 2128 } 2129 2130 static Sg_device *sg_get_dev(int dev) 2131 { 2132 struct sg_device *sdp; 2133 unsigned long flags; 2134 2135 read_lock_irqsave(&sg_index_lock, flags); 2136 sdp = sg_lookup_dev(dev); 2137 if (!sdp) 2138 sdp = ERR_PTR(-ENXIO); 2139 else if (sdp->detached) { 2140 /* If sdp->detached, then the refcount may already be 0, in 2141 * which case it would be a bug to do kref_get(). 2142 */ 2143 sdp = ERR_PTR(-ENODEV); 2144 } else 2145 kref_get(&sdp->d_ref); 2146 read_unlock_irqrestore(&sg_index_lock, flags); 2147 2148 return sdp; 2149 } 2150 2151 static void sg_put_dev(struct sg_device *sdp) 2152 { 2153 kref_put(&sdp->d_ref, sg_device_destroy); 2154 } 2155 2156 #ifdef CONFIG_SCSI_PROC_FS 2157 2158 static struct proc_dir_entry *sg_proc_sgp = NULL; 2159 2160 static char sg_proc_sg_dirname[] = "scsi/sg"; 2161 2162 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2163 2164 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2165 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2166 size_t count, loff_t *off); 2167 static struct file_operations adio_fops = { 2168 /* .owner, .read and .llseek added in sg_proc_init() */ 2169 .open = sg_proc_single_open_adio, 2170 .write = sg_proc_write_adio, 2171 .release = single_release, 2172 }; 2173 2174 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2175 static ssize_t sg_proc_write_dressz(struct file *filp, 2176 const char __user *buffer, size_t count, loff_t *off); 2177 static struct file_operations dressz_fops = { 2178 .open = sg_proc_single_open_dressz, 2179 .write = sg_proc_write_dressz, 2180 .release = single_release, 2181 }; 2182 2183 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2184 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2185 static struct file_operations version_fops = { 2186 .open = sg_proc_single_open_version, 2187 .release = single_release, 2188 }; 2189 2190 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2191 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2192 static struct file_operations devhdr_fops = { 2193 .open = sg_proc_single_open_devhdr, 2194 .release = single_release, 2195 }; 2196 2197 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2198 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2199 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2200 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2201 static void dev_seq_stop(struct seq_file *s, void *v); 2202 static struct file_operations dev_fops = { 2203 .open = sg_proc_open_dev, 2204 .release = seq_release, 2205 }; 2206 static struct seq_operations dev_seq_ops = { 2207 .start = dev_seq_start, 2208 .next = dev_seq_next, 2209 .stop = dev_seq_stop, 2210 .show = sg_proc_seq_show_dev, 2211 }; 2212 2213 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2214 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2215 static struct file_operations devstrs_fops = { 2216 .open = sg_proc_open_devstrs, 2217 .release = seq_release, 2218 }; 2219 static struct seq_operations devstrs_seq_ops = { 2220 .start = dev_seq_start, 2221 .next = dev_seq_next, 2222 .stop = dev_seq_stop, 2223 .show = sg_proc_seq_show_devstrs, 2224 }; 2225 2226 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2227 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2228 static struct file_operations debug_fops = { 2229 .open = sg_proc_open_debug, 2230 .release = seq_release, 2231 }; 2232 static struct seq_operations debug_seq_ops = { 2233 .start = dev_seq_start, 2234 .next = dev_seq_next, 2235 .stop = dev_seq_stop, 2236 .show = sg_proc_seq_show_debug, 2237 }; 2238 2239 2240 struct sg_proc_leaf { 2241 const char * name; 2242 struct file_operations * fops; 2243 }; 2244 2245 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2246 {"allow_dio", &adio_fops}, 2247 {"debug", &debug_fops}, 2248 {"def_reserved_size", &dressz_fops}, 2249 {"device_hdr", &devhdr_fops}, 2250 {"devices", &dev_fops}, 2251 {"device_strs", &devstrs_fops}, 2252 {"version", &version_fops} 2253 }; 2254 2255 static int 2256 sg_proc_init(void) 2257 { 2258 int k, mask; 2259 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2260 struct sg_proc_leaf * leaf; 2261 2262 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2263 if (!sg_proc_sgp) 2264 return 1; 2265 for (k = 0; k < num_leaves; ++k) { 2266 leaf = &sg_proc_leaf_arr[k]; 2267 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2268 leaf->fops->owner = THIS_MODULE; 2269 leaf->fops->read = seq_read; 2270 leaf->fops->llseek = seq_lseek; 2271 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); 2272 } 2273 return 0; 2274 } 2275 2276 static void 2277 sg_proc_cleanup(void) 2278 { 2279 int k; 2280 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2281 2282 if (!sg_proc_sgp) 2283 return; 2284 for (k = 0; k < num_leaves; ++k) 2285 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2286 remove_proc_entry(sg_proc_sg_dirname, NULL); 2287 } 2288 2289 2290 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2291 { 2292 seq_printf(s, "%d\n", *((int *)s->private)); 2293 return 0; 2294 } 2295 2296 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2297 { 2298 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2299 } 2300 2301 static ssize_t 2302 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2303 size_t count, loff_t *off) 2304 { 2305 int num; 2306 char buff[11]; 2307 2308 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2309 return -EACCES; 2310 num = (count < 10) ? count : 10; 2311 if (copy_from_user(buff, buffer, num)) 2312 return -EFAULT; 2313 buff[num] = '\0'; 2314 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2315 return count; 2316 } 2317 2318 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2319 { 2320 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2321 } 2322 2323 static ssize_t 2324 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2325 size_t count, loff_t *off) 2326 { 2327 int num; 2328 unsigned long k = ULONG_MAX; 2329 char buff[11]; 2330 2331 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2332 return -EACCES; 2333 num = (count < 10) ? count : 10; 2334 if (copy_from_user(buff, buffer, num)) 2335 return -EFAULT; 2336 buff[num] = '\0'; 2337 k = simple_strtoul(buff, NULL, 10); 2338 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2339 sg_big_buff = k; 2340 return count; 2341 } 2342 return -ERANGE; 2343 } 2344 2345 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2346 { 2347 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2348 sg_version_date); 2349 return 0; 2350 } 2351 2352 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2353 { 2354 return single_open(file, sg_proc_seq_show_version, NULL); 2355 } 2356 2357 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2358 { 2359 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2360 "online\n"); 2361 return 0; 2362 } 2363 2364 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2365 { 2366 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2367 } 2368 2369 struct sg_proc_deviter { 2370 loff_t index; 2371 size_t max; 2372 }; 2373 2374 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2375 { 2376 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2377 2378 s->private = it; 2379 if (! it) 2380 return NULL; 2381 2382 it->index = *pos; 2383 it->max = sg_last_dev(); 2384 if (it->index >= it->max) 2385 return NULL; 2386 return it; 2387 } 2388 2389 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2390 { 2391 struct sg_proc_deviter * it = s->private; 2392 2393 *pos = ++it->index; 2394 return (it->index < it->max) ? it : NULL; 2395 } 2396 2397 static void dev_seq_stop(struct seq_file *s, void *v) 2398 { 2399 kfree(s->private); 2400 } 2401 2402 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2403 { 2404 return seq_open(file, &dev_seq_ops); 2405 } 2406 2407 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2408 { 2409 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2410 Sg_device *sdp; 2411 struct scsi_device *scsidp; 2412 unsigned long iflags; 2413 2414 read_lock_irqsave(&sg_index_lock, iflags); 2415 sdp = it ? sg_lookup_dev(it->index) : NULL; 2416 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2417 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2418 scsidp->host->host_no, scsidp->channel, 2419 scsidp->id, scsidp->lun, (int) scsidp->type, 2420 1, 2421 (int) scsidp->queue_depth, 2422 (int) scsidp->device_busy, 2423 (int) scsi_device_online(scsidp)); 2424 else 2425 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2426 read_unlock_irqrestore(&sg_index_lock, iflags); 2427 return 0; 2428 } 2429 2430 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2431 { 2432 return seq_open(file, &devstrs_seq_ops); 2433 } 2434 2435 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2436 { 2437 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2438 Sg_device *sdp; 2439 struct scsi_device *scsidp; 2440 unsigned long iflags; 2441 2442 read_lock_irqsave(&sg_index_lock, iflags); 2443 sdp = it ? sg_lookup_dev(it->index) : NULL; 2444 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2445 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2446 scsidp->vendor, scsidp->model, scsidp->rev); 2447 else 2448 seq_printf(s, "<no active device>\n"); 2449 read_unlock_irqrestore(&sg_index_lock, iflags); 2450 return 0; 2451 } 2452 2453 /* must be called while holding sg_index_lock */ 2454 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2455 { 2456 int k, m, new_interface, blen, usg; 2457 Sg_request *srp; 2458 Sg_fd *fp; 2459 const sg_io_hdr_t *hp; 2460 const char * cp; 2461 unsigned int ms; 2462 2463 k = 0; 2464 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { 2465 k++; 2466 read_lock(&fp->rq_list_lock); /* irqs already disabled */ 2467 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2468 "(res)sgat=%d low_dma=%d\n", k, 2469 jiffies_to_msecs(fp->timeout), 2470 fp->reserve.bufflen, 2471 (int) fp->reserve.k_use_sg, 2472 (int) fp->low_dma); 2473 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2474 (int) fp->cmd_q, (int) fp->force_packid, 2475 (int) fp->keep_orphan, (int) fp->closed); 2476 for (m = 0, srp = fp->headrp; 2477 srp != NULL; 2478 ++m, srp = srp->nextrp) { 2479 hp = &srp->header; 2480 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2481 if (srp->res_used) { 2482 if (new_interface && 2483 (SG_FLAG_MMAP_IO & hp->flags)) 2484 cp = " mmap>> "; 2485 else 2486 cp = " rb>> "; 2487 } else { 2488 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2489 cp = " dio>> "; 2490 else 2491 cp = " "; 2492 } 2493 seq_printf(s, cp); 2494 blen = srp->data.bufflen; 2495 usg = srp->data.k_use_sg; 2496 seq_printf(s, srp->done ? 2497 ((1 == srp->done) ? "rcv:" : "fin:") 2498 : "act:"); 2499 seq_printf(s, " id=%d blen=%d", 2500 srp->header.pack_id, blen); 2501 if (srp->done) 2502 seq_printf(s, " dur=%d", hp->duration); 2503 else { 2504 ms = jiffies_to_msecs(jiffies); 2505 seq_printf(s, " t_o/elap=%d/%d", 2506 (new_interface ? hp->timeout : 2507 jiffies_to_msecs(fp->timeout)), 2508 (ms > hp->duration ? ms - hp->duration : 0)); 2509 } 2510 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2511 (int) srp->data.cmd_opcode); 2512 } 2513 if (0 == m) 2514 seq_printf(s, " No requests active\n"); 2515 read_unlock(&fp->rq_list_lock); 2516 } 2517 } 2518 2519 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2520 { 2521 return seq_open(file, &debug_seq_ops); 2522 } 2523 2524 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2525 { 2526 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2527 Sg_device *sdp; 2528 unsigned long iflags; 2529 2530 if (it && (0 == it->index)) { 2531 seq_printf(s, "max_active_device=%d(origin 1)\n", 2532 (int)it->max); 2533 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2534 } 2535 2536 read_lock_irqsave(&sg_index_lock, iflags); 2537 sdp = it ? sg_lookup_dev(it->index) : NULL; 2538 if (sdp && !list_empty(&sdp->sfds)) { 2539 struct scsi_device *scsidp = sdp->device; 2540 2541 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); 2542 if (sdp->detached) 2543 seq_printf(s, "detached pending close "); 2544 else 2545 seq_printf 2546 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2547 scsidp->host->host_no, 2548 scsidp->channel, scsidp->id, 2549 scsidp->lun, 2550 scsidp->host->hostt->emulated); 2551 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2552 sdp->sg_tablesize, sdp->exclude); 2553 sg_proc_debug_helper(s, sdp); 2554 } 2555 read_unlock_irqrestore(&sg_index_lock, iflags); 2556 return 0; 2557 } 2558 2559 #endif /* CONFIG_SCSI_PROC_FS */ 2560 2561 module_init(init_sg); 2562 module_exit(exit_sg); 2563