1 /* 2 * History: 3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), 4 * to allow user process control of SCSI devices. 5 * Development Sponsored by Killy Corp. NY NY 6 * 7 * Original driver (sg.c): 8 * Copyright (C) 1992 Lawrence Foard 9 * Version 2 and 3 extensions to driver: 10 * Copyright (C) 1998 - 2005 Douglas Gilbert 11 * 12 * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 */ 20 21 static int sg_version_num = 30534; /* 2 digits for each component */ 22 #define SG_VERSION_STR "3.5.34" 23 24 /* 25 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes: 26 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First 27 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING 28 * (otherwise the macros compile to empty statements). 29 * 30 */ 31 #include <linux/module.h> 32 33 #include <linux/fs.h> 34 #include <linux/kernel.h> 35 #include <linux/sched.h> 36 #include <linux/string.h> 37 #include <linux/mm.h> 38 #include <linux/aio.h> 39 #include <linux/errno.h> 40 #include <linux/mtio.h> 41 #include <linux/ioctl.h> 42 #include <linux/slab.h> 43 #include <linux/fcntl.h> 44 #include <linux/init.h> 45 #include <linux/poll.h> 46 #include <linux/moduleparam.h> 47 #include <linux/cdev.h> 48 #include <linux/idr.h> 49 #include <linux/seq_file.h> 50 #include <linux/blkdev.h> 51 #include <linux/delay.h> 52 #include <linux/blktrace_api.h> 53 #include <linux/mutex.h> 54 #include <linux/ratelimit.h> 55 56 #include "scsi.h" 57 #include <scsi/scsi_dbg.h> 58 #include <scsi/scsi_host.h> 59 #include <scsi/scsi_driver.h> 60 #include <scsi/scsi_ioctl.h> 61 #include <scsi/sg.h> 62 63 #include "scsi_logging.h" 64 65 #ifdef CONFIG_SCSI_PROC_FS 66 #include <linux/proc_fs.h> 67 static char *sg_version_date = "20061027"; 68 69 static int sg_proc_init(void); 70 static void sg_proc_cleanup(void); 71 #endif 72 73 #define SG_ALLOW_DIO_DEF 0 74 75 #define SG_MAX_DEVS 32768 76 77 /* 78 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 79 * Then when using 32 bit integers x * m may overflow during the calculation. 80 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 81 * calculates the same, but prevents the overflow when both m and d 82 * are "small" numbers (like HZ and USER_HZ). 83 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 84 * in 32 bits. 85 */ 86 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 87 88 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 89 90 int sg_big_buff = SG_DEF_RESERVED_SIZE; 91 /* N.B. This variable is readable and writeable via 92 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 93 of this size (or less if there is not enough memory) will be reserved 94 for use by this file descriptor. [Deprecated usage: this variable is also 95 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 96 the kernel (i.e. it is not a module).] */ 97 static int def_reserved_size = -1; /* picks up init parameter */ 98 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 99 100 static int scatter_elem_sz = SG_SCATTER_SZ; 101 static int scatter_elem_sz_prev = SG_SCATTER_SZ; 102 103 #define SG_SECTOR_SZ 512 104 105 static int sg_add(struct device *, struct class_interface *); 106 static void sg_remove(struct device *, struct class_interface *); 107 108 static DEFINE_IDR(sg_index_idr); 109 static DEFINE_RWLOCK(sg_index_lock); 110 111 static struct class_interface sg_interface = { 112 .add_dev = sg_add, 113 .remove_dev = sg_remove, 114 }; 115 116 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 117 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 118 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ 119 unsigned bufflen; /* Size of (aggregate) data buffer */ 120 struct page **pages; 121 int page_order; 122 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 123 unsigned char cmd_opcode; /* first byte of command */ 124 } Sg_scatter_hold; 125 126 struct sg_device; /* forward declarations */ 127 struct sg_fd; 128 129 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 130 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 131 struct sg_fd *parentfp; /* NULL -> not in use */ 132 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 133 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 134 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; 135 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 136 char orphan; /* 1 -> drop on sight, 0 -> normal */ 137 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 138 /* done protected by rq_list_lock */ 139 char done; /* 0->before bh, 1->before read, 2->read */ 140 struct request *rq; 141 struct bio *bio; 142 struct execute_work ew; 143 } Sg_request; 144 145 typedef struct sg_fd { /* holds the state of a file descriptor */ 146 struct list_head sfd_siblings; /* protected by sfd_lock of device */ 147 struct sg_device *parentdp; /* owning device */ 148 wait_queue_head_t read_wait; /* queue read until command done */ 149 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 150 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 151 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 152 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 153 unsigned save_scat_len; /* original length of trunc. scat. element */ 154 Sg_request *headrp; /* head of request slist, NULL->empty */ 155 struct fasync_struct *async_qp; /* used by asynchronous notification */ 156 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 157 char low_dma; /* as in parent but possibly overridden to 1 */ 158 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 159 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 160 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ 161 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 162 char mmap_called; /* 0 -> mmap() never called on this fd */ 163 struct kref f_ref; 164 struct execute_work ew; 165 } Sg_fd; 166 167 typedef struct sg_device { /* holds the state of each scsi generic device */ 168 struct scsi_device *device; 169 int sg_tablesize; /* adapter's max scatter-gather table size */ 170 u32 index; /* device index number */ 171 spinlock_t sfd_lock; /* protect file descriptor list for device */ 172 struct list_head sfds; 173 struct rw_semaphore o_sem; /* exclude open should hold this rwsem */ 174 volatile char detached; /* 0->attached, 1->detached pending removal */ 175 char exclude; /* opened for exclusive access */ 176 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 177 struct gendisk *disk; 178 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 179 struct kref d_ref; 180 } Sg_device; 181 182 /* tasklet or soft irq callback */ 183 static void sg_rq_end_io(struct request *rq, int uptodate); 184 static int sg_start_req(Sg_request *srp, unsigned char *cmd); 185 static int sg_finish_rem_req(Sg_request * srp); 186 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 187 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 188 Sg_request * srp); 189 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, 190 const char __user *buf, size_t count, int blocking, 191 int read_only, int sg_io_owned, Sg_request **o_srp); 192 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 193 unsigned char *cmnd, int timeout, int blocking); 194 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 195 static void sg_remove_scat(Sg_scatter_hold * schp); 196 static void sg_build_reserve(Sg_fd * sfp, int req_size); 197 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 198 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 199 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 200 static void sg_remove_sfp(struct kref *); 201 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 202 static Sg_request *sg_add_request(Sg_fd * sfp); 203 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 204 static int sg_res_in_use(Sg_fd * sfp); 205 static Sg_device *sg_get_dev(int dev); 206 static void sg_put_dev(Sg_device *sdp); 207 208 #define SZ_SG_HEADER sizeof(struct sg_header) 209 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 210 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 211 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 212 213 static int sg_allow_access(struct file *filp, unsigned char *cmd) 214 { 215 struct sg_fd *sfp = filp->private_data; 216 217 if (sfp->parentdp->device->type == TYPE_SCANNER) 218 return 0; 219 220 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); 221 } 222 223 static int sfds_list_empty(Sg_device *sdp) 224 { 225 unsigned long flags; 226 int ret; 227 228 spin_lock_irqsave(&sdp->sfd_lock, flags); 229 ret = list_empty(&sdp->sfds); 230 spin_unlock_irqrestore(&sdp->sfd_lock, flags); 231 return ret; 232 } 233 234 static int 235 sg_open(struct inode *inode, struct file *filp) 236 { 237 int dev = iminor(inode); 238 int flags = filp->f_flags; 239 struct request_queue *q; 240 Sg_device *sdp; 241 Sg_fd *sfp; 242 int retval; 243 244 nonseekable_open(inode, filp); 245 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 246 sdp = sg_get_dev(dev); 247 if (IS_ERR(sdp)) { 248 retval = PTR_ERR(sdp); 249 sdp = NULL; 250 goto sg_put; 251 } 252 253 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 254 /* Prevent the device driver from vanishing while we sleep */ 255 retval = scsi_device_get(sdp->device); 256 if (retval) 257 goto sg_put; 258 259 retval = scsi_autopm_get_device(sdp->device); 260 if (retval) 261 goto sdp_put; 262 263 if (!((flags & O_NONBLOCK) || 264 scsi_block_when_processing_errors(sdp->device))) { 265 retval = -ENXIO; 266 /* we are in error recovery for this device */ 267 goto error_out; 268 } 269 270 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) { 271 retval = -EPERM; /* Can't lock it with read only access */ 272 goto error_out; 273 } 274 if (flags & O_NONBLOCK) { 275 if (flags & O_EXCL) { 276 if (!down_write_trylock(&sdp->o_sem)) { 277 retval = -EBUSY; 278 goto error_out; 279 } 280 } else { 281 if (!down_read_trylock(&sdp->o_sem)) { 282 retval = -EBUSY; 283 goto error_out; 284 } 285 } 286 } else { 287 if (flags & O_EXCL) 288 down_write(&sdp->o_sem); 289 else 290 down_read(&sdp->o_sem); 291 } 292 /* Since write lock is held, no need to check sfd_list */ 293 if (flags & O_EXCL) 294 sdp->exclude = 1; /* used by release lock */ 295 296 if (sfds_list_empty(sdp)) { /* no existing opens on this device */ 297 sdp->sgdebug = 0; 298 q = sdp->device->request_queue; 299 sdp->sg_tablesize = queue_max_segments(q); 300 } 301 sfp = sg_add_sfp(sdp, dev); 302 if (!IS_ERR(sfp)) 303 filp->private_data = sfp; 304 /* retval is already provably zero at this point because of the 305 * check after retval = scsi_autopm_get_device(sdp->device)) 306 */ 307 else { 308 retval = PTR_ERR(sfp); 309 310 if (flags & O_EXCL) { 311 sdp->exclude = 0; /* undo if error */ 312 up_write(&sdp->o_sem); 313 } else 314 up_read(&sdp->o_sem); 315 error_out: 316 scsi_autopm_put_device(sdp->device); 317 sdp_put: 318 scsi_device_put(sdp->device); 319 } 320 sg_put: 321 if (sdp) 322 sg_put_dev(sdp); 323 return retval; 324 } 325 326 /* Following function was formerly called 'sg_close' */ 327 static int 328 sg_release(struct inode *inode, struct file *filp) 329 { 330 Sg_device *sdp; 331 Sg_fd *sfp; 332 int excl; 333 334 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 335 return -ENXIO; 336 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 337 338 excl = sdp->exclude; 339 sdp->exclude = 0; 340 if (excl) 341 up_write(&sdp->o_sem); 342 else 343 up_read(&sdp->o_sem); 344 345 scsi_autopm_put_device(sdp->device); 346 kref_put(&sfp->f_ref, sg_remove_sfp); 347 return 0; 348 } 349 350 static ssize_t 351 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 352 { 353 Sg_device *sdp; 354 Sg_fd *sfp; 355 Sg_request *srp; 356 int req_pack_id = -1; 357 sg_io_hdr_t *hp; 358 struct sg_header *old_hdr = NULL; 359 int retval = 0; 360 361 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 362 return -ENXIO; 363 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 364 sdp->disk->disk_name, (int) count)); 365 366 if (!access_ok(VERIFY_WRITE, buf, count)) 367 return -EFAULT; 368 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 369 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 370 if (!old_hdr) 371 return -ENOMEM; 372 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 373 retval = -EFAULT; 374 goto free_old_hdr; 375 } 376 if (old_hdr->reply_len < 0) { 377 if (count >= SZ_SG_IO_HDR) { 378 sg_io_hdr_t *new_hdr; 379 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 380 if (!new_hdr) { 381 retval = -ENOMEM; 382 goto free_old_hdr; 383 } 384 retval =__copy_from_user 385 (new_hdr, buf, SZ_SG_IO_HDR); 386 req_pack_id = new_hdr->pack_id; 387 kfree(new_hdr); 388 if (retval) { 389 retval = -EFAULT; 390 goto free_old_hdr; 391 } 392 } 393 } else 394 req_pack_id = old_hdr->pack_id; 395 } 396 srp = sg_get_rq_mark(sfp, req_pack_id); 397 if (!srp) { /* now wait on packet to arrive */ 398 if (sdp->detached) { 399 retval = -ENODEV; 400 goto free_old_hdr; 401 } 402 if (filp->f_flags & O_NONBLOCK) { 403 retval = -EAGAIN; 404 goto free_old_hdr; 405 } 406 retval = wait_event_interruptible(sfp->read_wait, 407 (sdp->detached || 408 (srp = sg_get_rq_mark(sfp, req_pack_id)))); 409 if (sdp->detached) { 410 retval = -ENODEV; 411 goto free_old_hdr; 412 } 413 if (retval) { 414 /* -ERESTARTSYS as signal hit process */ 415 goto free_old_hdr; 416 } 417 } 418 if (srp->header.interface_id != '\0') { 419 retval = sg_new_read(sfp, buf, count, srp); 420 goto free_old_hdr; 421 } 422 423 hp = &srp->header; 424 if (old_hdr == NULL) { 425 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 426 if (! old_hdr) { 427 retval = -ENOMEM; 428 goto free_old_hdr; 429 } 430 } 431 memset(old_hdr, 0, SZ_SG_HEADER); 432 old_hdr->reply_len = (int) hp->timeout; 433 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 434 old_hdr->pack_id = hp->pack_id; 435 old_hdr->twelve_byte = 436 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 437 old_hdr->target_status = hp->masked_status; 438 old_hdr->host_status = hp->host_status; 439 old_hdr->driver_status = hp->driver_status; 440 if ((CHECK_CONDITION & hp->masked_status) || 441 (DRIVER_SENSE & hp->driver_status)) 442 memcpy(old_hdr->sense_buffer, srp->sense_b, 443 sizeof (old_hdr->sense_buffer)); 444 switch (hp->host_status) { 445 /* This setup of 'result' is for backward compatibility and is best 446 ignored by the user who should use target, host + driver status */ 447 case DID_OK: 448 case DID_PASSTHROUGH: 449 case DID_SOFT_ERROR: 450 old_hdr->result = 0; 451 break; 452 case DID_NO_CONNECT: 453 case DID_BUS_BUSY: 454 case DID_TIME_OUT: 455 old_hdr->result = EBUSY; 456 break; 457 case DID_BAD_TARGET: 458 case DID_ABORT: 459 case DID_PARITY: 460 case DID_RESET: 461 case DID_BAD_INTR: 462 old_hdr->result = EIO; 463 break; 464 case DID_ERROR: 465 old_hdr->result = (srp->sense_b[0] == 0 && 466 hp->masked_status == GOOD) ? 0 : EIO; 467 break; 468 default: 469 old_hdr->result = EIO; 470 break; 471 } 472 473 /* Now copy the result back to the user buffer. */ 474 if (count >= SZ_SG_HEADER) { 475 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 476 retval = -EFAULT; 477 goto free_old_hdr; 478 } 479 buf += SZ_SG_HEADER; 480 if (count > old_hdr->reply_len) 481 count = old_hdr->reply_len; 482 if (count > SZ_SG_HEADER) { 483 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 484 retval = -EFAULT; 485 goto free_old_hdr; 486 } 487 } 488 } else 489 count = (old_hdr->result == 0) ? 0 : -EIO; 490 sg_finish_rem_req(srp); 491 retval = count; 492 free_old_hdr: 493 kfree(old_hdr); 494 return retval; 495 } 496 497 static ssize_t 498 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 499 { 500 sg_io_hdr_t *hp = &srp->header; 501 int err = 0; 502 int len; 503 504 if (count < SZ_SG_IO_HDR) { 505 err = -EINVAL; 506 goto err_out; 507 } 508 hp->sb_len_wr = 0; 509 if ((hp->mx_sb_len > 0) && hp->sbp) { 510 if ((CHECK_CONDITION & hp->masked_status) || 511 (DRIVER_SENSE & hp->driver_status)) { 512 int sb_len = SCSI_SENSE_BUFFERSIZE; 513 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 514 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 515 len = (len > sb_len) ? sb_len : len; 516 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 517 err = -EFAULT; 518 goto err_out; 519 } 520 hp->sb_len_wr = len; 521 } 522 } 523 if (hp->masked_status || hp->host_status || hp->driver_status) 524 hp->info |= SG_INFO_CHECK; 525 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 526 err = -EFAULT; 527 goto err_out; 528 } 529 err_out: 530 err = sg_finish_rem_req(srp); 531 return (0 == err) ? count : err; 532 } 533 534 static ssize_t 535 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 536 { 537 int mxsize, cmd_size, k; 538 int input_size, blocking; 539 unsigned char opcode; 540 Sg_device *sdp; 541 Sg_fd *sfp; 542 Sg_request *srp; 543 struct sg_header old_hdr; 544 sg_io_hdr_t *hp; 545 unsigned char cmnd[MAX_COMMAND_SIZE]; 546 547 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 548 return -ENXIO; 549 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 550 sdp->disk->disk_name, (int) count)); 551 if (sdp->detached) 552 return -ENODEV; 553 if (!((filp->f_flags & O_NONBLOCK) || 554 scsi_block_when_processing_errors(sdp->device))) 555 return -ENXIO; 556 557 if (!access_ok(VERIFY_READ, buf, count)) 558 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 559 if (count < SZ_SG_HEADER) 560 return -EIO; 561 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 562 return -EFAULT; 563 blocking = !(filp->f_flags & O_NONBLOCK); 564 if (old_hdr.reply_len < 0) 565 return sg_new_write(sfp, filp, buf, count, 566 blocking, 0, 0, NULL); 567 if (count < (SZ_SG_HEADER + 6)) 568 return -EIO; /* The minimum scsi command length is 6 bytes. */ 569 570 if (!(srp = sg_add_request(sfp))) { 571 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 572 return -EDOM; 573 } 574 buf += SZ_SG_HEADER; 575 __get_user(opcode, buf); 576 if (sfp->next_cmd_len > 0) { 577 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 578 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 579 sfp->next_cmd_len = 0; 580 sg_remove_request(sfp, srp); 581 return -EIO; 582 } 583 cmd_size = sfp->next_cmd_len; 584 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 585 } else { 586 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 587 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 588 cmd_size = 12; 589 } 590 SCSI_LOG_TIMEOUT(4, printk( 591 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 592 /* Determine buffer size. */ 593 input_size = count - cmd_size; 594 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 595 mxsize -= SZ_SG_HEADER; 596 input_size -= SZ_SG_HEADER; 597 if (input_size < 0) { 598 sg_remove_request(sfp, srp); 599 return -EIO; /* User did not pass enough bytes for this command. */ 600 } 601 hp = &srp->header; 602 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 603 hp->cmd_len = (unsigned char) cmd_size; 604 hp->iovec_count = 0; 605 hp->mx_sb_len = 0; 606 if (input_size > 0) 607 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 608 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 609 else 610 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 611 hp->dxfer_len = mxsize; 612 if (hp->dxfer_direction == SG_DXFER_TO_DEV) 613 hp->dxferp = (char __user *)buf + cmd_size; 614 else 615 hp->dxferp = NULL; 616 hp->sbp = NULL; 617 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 618 hp->flags = input_size; /* structure abuse ... */ 619 hp->pack_id = old_hdr.pack_id; 620 hp->usr_ptr = NULL; 621 if (__copy_from_user(cmnd, buf, cmd_size)) 622 return -EFAULT; 623 /* 624 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 625 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 626 * is a non-zero input_size, so emit a warning. 627 */ 628 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { 629 static char cmd[TASK_COMM_LEN]; 630 if (strcmp(current->comm, cmd)) { 631 printk_ratelimited(KERN_WARNING 632 "sg_write: data in/out %d/%d bytes " 633 "for SCSI command 0x%x-- guessing " 634 "data in;\n program %s not setting " 635 "count and/or reply_len properly\n", 636 old_hdr.reply_len - (int)SZ_SG_HEADER, 637 input_size, (unsigned int) cmnd[0], 638 current->comm); 639 strcpy(cmd, current->comm); 640 } 641 } 642 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 643 return (k < 0) ? k : count; 644 } 645 646 static ssize_t 647 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, 648 size_t count, int blocking, int read_only, int sg_io_owned, 649 Sg_request **o_srp) 650 { 651 int k; 652 Sg_request *srp; 653 sg_io_hdr_t *hp; 654 unsigned char cmnd[MAX_COMMAND_SIZE]; 655 int timeout; 656 unsigned long ul_timeout; 657 658 if (count < SZ_SG_IO_HDR) 659 return -EINVAL; 660 if (!access_ok(VERIFY_READ, buf, count)) 661 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 662 663 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 664 if (!(srp = sg_add_request(sfp))) { 665 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 666 return -EDOM; 667 } 668 srp->sg_io_owned = sg_io_owned; 669 hp = &srp->header; 670 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 671 sg_remove_request(sfp, srp); 672 return -EFAULT; 673 } 674 if (hp->interface_id != 'S') { 675 sg_remove_request(sfp, srp); 676 return -ENOSYS; 677 } 678 if (hp->flags & SG_FLAG_MMAP_IO) { 679 if (hp->dxfer_len > sfp->reserve.bufflen) { 680 sg_remove_request(sfp, srp); 681 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 682 } 683 if (hp->flags & SG_FLAG_DIRECT_IO) { 684 sg_remove_request(sfp, srp); 685 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 686 } 687 if (sg_res_in_use(sfp)) { 688 sg_remove_request(sfp, srp); 689 return -EBUSY; /* reserve buffer already being used */ 690 } 691 } 692 ul_timeout = msecs_to_jiffies(srp->header.timeout); 693 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 694 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 695 sg_remove_request(sfp, srp); 696 return -EMSGSIZE; 697 } 698 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 699 sg_remove_request(sfp, srp); 700 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 701 } 702 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 703 sg_remove_request(sfp, srp); 704 return -EFAULT; 705 } 706 if (read_only && sg_allow_access(file, cmnd)) { 707 sg_remove_request(sfp, srp); 708 return -EPERM; 709 } 710 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 711 if (k < 0) 712 return k; 713 if (o_srp) 714 *o_srp = srp; 715 return count; 716 } 717 718 static int 719 sg_common_write(Sg_fd * sfp, Sg_request * srp, 720 unsigned char *cmnd, int timeout, int blocking) 721 { 722 int k, data_dir; 723 Sg_device *sdp = sfp->parentdp; 724 sg_io_hdr_t *hp = &srp->header; 725 726 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 727 hp->status = 0; 728 hp->masked_status = 0; 729 hp->msg_status = 0; 730 hp->info = 0; 731 hp->host_status = 0; 732 hp->driver_status = 0; 733 hp->resid = 0; 734 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 735 (int) cmnd[0], (int) hp->cmd_len)); 736 737 k = sg_start_req(srp, cmnd); 738 if (k) { 739 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); 740 sg_finish_rem_req(srp); 741 return k; /* probably out of space --> ENOMEM */ 742 } 743 if (sdp->detached) { 744 if (srp->bio) 745 blk_end_request_all(srp->rq, -EIO); 746 sg_finish_rem_req(srp); 747 return -ENODEV; 748 } 749 750 switch (hp->dxfer_direction) { 751 case SG_DXFER_TO_FROM_DEV: 752 case SG_DXFER_FROM_DEV: 753 data_dir = DMA_FROM_DEVICE; 754 break; 755 case SG_DXFER_TO_DEV: 756 data_dir = DMA_TO_DEVICE; 757 break; 758 case SG_DXFER_UNKNOWN: 759 data_dir = DMA_BIDIRECTIONAL; 760 break; 761 default: 762 data_dir = DMA_NONE; 763 break; 764 } 765 hp->duration = jiffies_to_msecs(jiffies); 766 767 srp->rq->timeout = timeout; 768 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ 769 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, 770 srp->rq, 1, sg_rq_end_io); 771 return 0; 772 } 773 774 static int srp_done(Sg_fd *sfp, Sg_request *srp) 775 { 776 unsigned long flags; 777 int ret; 778 779 read_lock_irqsave(&sfp->rq_list_lock, flags); 780 ret = srp->done; 781 read_unlock_irqrestore(&sfp->rq_list_lock, flags); 782 return ret; 783 } 784 785 static long 786 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 787 { 788 void __user *p = (void __user *)arg; 789 int __user *ip = p; 790 int result, val, read_only; 791 Sg_device *sdp; 792 Sg_fd *sfp; 793 Sg_request *srp; 794 unsigned long iflags; 795 796 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 797 return -ENXIO; 798 799 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 800 sdp->disk->disk_name, (int) cmd_in)); 801 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 802 803 switch (cmd_in) { 804 case SG_IO: 805 if (sdp->detached) 806 return -ENODEV; 807 if (!scsi_block_when_processing_errors(sdp->device)) 808 return -ENXIO; 809 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 810 return -EFAULT; 811 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, 812 1, read_only, 1, &srp); 813 if (result < 0) 814 return result; 815 result = wait_event_interruptible(sfp->read_wait, 816 (srp_done(sfp, srp) || sdp->detached)); 817 if (sdp->detached) 818 return -ENODEV; 819 write_lock_irq(&sfp->rq_list_lock); 820 if (srp->done) { 821 srp->done = 2; 822 write_unlock_irq(&sfp->rq_list_lock); 823 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 824 return (result < 0) ? result : 0; 825 } 826 srp->orphan = 1; 827 write_unlock_irq(&sfp->rq_list_lock); 828 return result; /* -ERESTARTSYS because signal hit process */ 829 case SG_SET_TIMEOUT: 830 result = get_user(val, ip); 831 if (result) 832 return result; 833 if (val < 0) 834 return -EIO; 835 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 836 val = MULDIV (INT_MAX, USER_HZ, HZ); 837 sfp->timeout_user = val; 838 sfp->timeout = MULDIV (val, HZ, USER_HZ); 839 840 return 0; 841 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 842 /* strange ..., for backward compatibility */ 843 return sfp->timeout_user; 844 case SG_SET_FORCE_LOW_DMA: 845 result = get_user(val, ip); 846 if (result) 847 return result; 848 if (val) { 849 sfp->low_dma = 1; 850 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 851 val = (int) sfp->reserve.bufflen; 852 sg_remove_scat(&sfp->reserve); 853 sg_build_reserve(sfp, val); 854 } 855 } else { 856 if (sdp->detached) 857 return -ENODEV; 858 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 859 } 860 return 0; 861 case SG_GET_LOW_DMA: 862 return put_user((int) sfp->low_dma, ip); 863 case SG_GET_SCSI_ID: 864 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 865 return -EFAULT; 866 else { 867 sg_scsi_id_t __user *sg_idp = p; 868 869 if (sdp->detached) 870 return -ENODEV; 871 __put_user((int) sdp->device->host->host_no, 872 &sg_idp->host_no); 873 __put_user((int) sdp->device->channel, 874 &sg_idp->channel); 875 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 876 __put_user((int) sdp->device->lun, &sg_idp->lun); 877 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 878 __put_user((short) sdp->device->host->cmd_per_lun, 879 &sg_idp->h_cmd_per_lun); 880 __put_user((short) sdp->device->queue_depth, 881 &sg_idp->d_queue_depth); 882 __put_user(0, &sg_idp->unused[0]); 883 __put_user(0, &sg_idp->unused[1]); 884 return 0; 885 } 886 case SG_SET_FORCE_PACK_ID: 887 result = get_user(val, ip); 888 if (result) 889 return result; 890 sfp->force_packid = val ? 1 : 0; 891 return 0; 892 case SG_GET_PACK_ID: 893 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 894 return -EFAULT; 895 read_lock_irqsave(&sfp->rq_list_lock, iflags); 896 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 897 if ((1 == srp->done) && (!srp->sg_io_owned)) { 898 read_unlock_irqrestore(&sfp->rq_list_lock, 899 iflags); 900 __put_user(srp->header.pack_id, ip); 901 return 0; 902 } 903 } 904 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 905 __put_user(-1, ip); 906 return 0; 907 case SG_GET_NUM_WAITING: 908 read_lock_irqsave(&sfp->rq_list_lock, iflags); 909 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 910 if ((1 == srp->done) && (!srp->sg_io_owned)) 911 ++val; 912 } 913 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 914 return put_user(val, ip); 915 case SG_GET_SG_TABLESIZE: 916 return put_user(sdp->sg_tablesize, ip); 917 case SG_SET_RESERVED_SIZE: 918 result = get_user(val, ip); 919 if (result) 920 return result; 921 if (val < 0) 922 return -EINVAL; 923 val = min_t(int, val, 924 queue_max_sectors(sdp->device->request_queue) * 512); 925 if (val != sfp->reserve.bufflen) { 926 if (sg_res_in_use(sfp) || sfp->mmap_called) 927 return -EBUSY; 928 sg_remove_scat(&sfp->reserve); 929 sg_build_reserve(sfp, val); 930 } 931 return 0; 932 case SG_GET_RESERVED_SIZE: 933 val = min_t(int, sfp->reserve.bufflen, 934 queue_max_sectors(sdp->device->request_queue) * 512); 935 return put_user(val, ip); 936 case SG_SET_COMMAND_Q: 937 result = get_user(val, ip); 938 if (result) 939 return result; 940 sfp->cmd_q = val ? 1 : 0; 941 return 0; 942 case SG_GET_COMMAND_Q: 943 return put_user((int) sfp->cmd_q, ip); 944 case SG_SET_KEEP_ORPHAN: 945 result = get_user(val, ip); 946 if (result) 947 return result; 948 sfp->keep_orphan = val; 949 return 0; 950 case SG_GET_KEEP_ORPHAN: 951 return put_user((int) sfp->keep_orphan, ip); 952 case SG_NEXT_CMD_LEN: 953 result = get_user(val, ip); 954 if (result) 955 return result; 956 sfp->next_cmd_len = (val > 0) ? val : 0; 957 return 0; 958 case SG_GET_VERSION_NUM: 959 return put_user(sg_version_num, ip); 960 case SG_GET_ACCESS_COUNT: 961 /* faked - we don't have a real access count anymore */ 962 val = (sdp->device ? 1 : 0); 963 return put_user(val, ip); 964 case SG_GET_REQUEST_TABLE: 965 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 966 return -EFAULT; 967 else { 968 sg_req_info_t *rinfo; 969 unsigned int ms; 970 971 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 972 GFP_KERNEL); 973 if (!rinfo) 974 return -ENOMEM; 975 read_lock_irqsave(&sfp->rq_list_lock, iflags); 976 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 977 ++val, srp = srp ? srp->nextrp : srp) { 978 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 979 if (srp) { 980 rinfo[val].req_state = srp->done + 1; 981 rinfo[val].problem = 982 srp->header.masked_status & 983 srp->header.host_status & 984 srp->header.driver_status; 985 if (srp->done) 986 rinfo[val].duration = 987 srp->header.duration; 988 else { 989 ms = jiffies_to_msecs(jiffies); 990 rinfo[val].duration = 991 (ms > srp->header.duration) ? 992 (ms - srp->header.duration) : 0; 993 } 994 rinfo[val].orphan = srp->orphan; 995 rinfo[val].sg_io_owned = 996 srp->sg_io_owned; 997 rinfo[val].pack_id = 998 srp->header.pack_id; 999 rinfo[val].usr_ptr = 1000 srp->header.usr_ptr; 1001 } 1002 } 1003 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1004 result = __copy_to_user(p, rinfo, 1005 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 1006 result = result ? -EFAULT : 0; 1007 kfree(rinfo); 1008 return result; 1009 } 1010 case SG_EMULATED_HOST: 1011 if (sdp->detached) 1012 return -ENODEV; 1013 return put_user(sdp->device->host->hostt->emulated, ip); 1014 case SG_SCSI_RESET: 1015 if (sdp->detached) 1016 return -ENODEV; 1017 if (filp->f_flags & O_NONBLOCK) { 1018 if (scsi_host_in_recovery(sdp->device->host)) 1019 return -EBUSY; 1020 } else if (!scsi_block_when_processing_errors(sdp->device)) 1021 return -EBUSY; 1022 result = get_user(val, ip); 1023 if (result) 1024 return result; 1025 if (SG_SCSI_RESET_NOTHING == val) 1026 return 0; 1027 switch (val) { 1028 case SG_SCSI_RESET_DEVICE: 1029 val = SCSI_TRY_RESET_DEVICE; 1030 break; 1031 case SG_SCSI_RESET_TARGET: 1032 val = SCSI_TRY_RESET_TARGET; 1033 break; 1034 case SG_SCSI_RESET_BUS: 1035 val = SCSI_TRY_RESET_BUS; 1036 break; 1037 case SG_SCSI_RESET_HOST: 1038 val = SCSI_TRY_RESET_HOST; 1039 break; 1040 default: 1041 return -EINVAL; 1042 } 1043 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1044 return -EACCES; 1045 return (scsi_reset_provider(sdp->device, val) == 1046 SUCCESS) ? 0 : -EIO; 1047 case SCSI_IOCTL_SEND_COMMAND: 1048 if (sdp->detached) 1049 return -ENODEV; 1050 if (read_only) { 1051 unsigned char opcode = WRITE_6; 1052 Scsi_Ioctl_Command __user *siocp = p; 1053 1054 if (copy_from_user(&opcode, siocp->data, 1)) 1055 return -EFAULT; 1056 if (sg_allow_access(filp, &opcode)) 1057 return -EPERM; 1058 } 1059 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); 1060 case SG_SET_DEBUG: 1061 result = get_user(val, ip); 1062 if (result) 1063 return result; 1064 sdp->sgdebug = (char) val; 1065 return 0; 1066 case SCSI_IOCTL_GET_IDLUN: 1067 case SCSI_IOCTL_GET_BUS_NUMBER: 1068 case SCSI_IOCTL_PROBE_HOST: 1069 case SG_GET_TRANSFORM: 1070 if (sdp->detached) 1071 return -ENODEV; 1072 return scsi_ioctl(sdp->device, cmd_in, p); 1073 case BLKSECTGET: 1074 return put_user(queue_max_sectors(sdp->device->request_queue) * 512, 1075 ip); 1076 case BLKTRACESETUP: 1077 return blk_trace_setup(sdp->device->request_queue, 1078 sdp->disk->disk_name, 1079 MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1080 NULL, 1081 (char *)arg); 1082 case BLKTRACESTART: 1083 return blk_trace_startstop(sdp->device->request_queue, 1); 1084 case BLKTRACESTOP: 1085 return blk_trace_startstop(sdp->device->request_queue, 0); 1086 case BLKTRACETEARDOWN: 1087 return blk_trace_remove(sdp->device->request_queue); 1088 default: 1089 if (read_only) 1090 return -EPERM; /* don't know so take safe approach */ 1091 return scsi_ioctl(sdp->device, cmd_in, p); 1092 } 1093 } 1094 1095 #ifdef CONFIG_COMPAT 1096 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1097 { 1098 Sg_device *sdp; 1099 Sg_fd *sfp; 1100 struct scsi_device *sdev; 1101 1102 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1103 return -ENXIO; 1104 1105 sdev = sdp->device; 1106 if (sdev->host->hostt->compat_ioctl) { 1107 int ret; 1108 1109 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1110 1111 return ret; 1112 } 1113 1114 return -ENOIOCTLCMD; 1115 } 1116 #endif 1117 1118 static unsigned int 1119 sg_poll(struct file *filp, poll_table * wait) 1120 { 1121 unsigned int res = 0; 1122 Sg_device *sdp; 1123 Sg_fd *sfp; 1124 Sg_request *srp; 1125 int count = 0; 1126 unsigned long iflags; 1127 1128 sfp = filp->private_data; 1129 if (!sfp) 1130 return POLLERR; 1131 sdp = sfp->parentdp; 1132 if (!sdp) 1133 return POLLERR; 1134 poll_wait(filp, &sfp->read_wait, wait); 1135 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1136 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1137 /* if any read waiting, flag it */ 1138 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1139 res = POLLIN | POLLRDNORM; 1140 ++count; 1141 } 1142 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1143 1144 if (sdp->detached) 1145 res |= POLLHUP; 1146 else if (!sfp->cmd_q) { 1147 if (0 == count) 1148 res |= POLLOUT | POLLWRNORM; 1149 } else if (count < SG_MAX_QUEUE) 1150 res |= POLLOUT | POLLWRNORM; 1151 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1152 sdp->disk->disk_name, (int) res)); 1153 return res; 1154 } 1155 1156 static int 1157 sg_fasync(int fd, struct file *filp, int mode) 1158 { 1159 Sg_device *sdp; 1160 Sg_fd *sfp; 1161 1162 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1163 return -ENXIO; 1164 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1165 sdp->disk->disk_name, mode)); 1166 1167 return fasync_helper(fd, filp, mode, &sfp->async_qp); 1168 } 1169 1170 static int 1171 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1172 { 1173 Sg_fd *sfp; 1174 unsigned long offset, len, sa; 1175 Sg_scatter_hold *rsv_schp; 1176 int k, length; 1177 1178 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1179 return VM_FAULT_SIGBUS; 1180 rsv_schp = &sfp->reserve; 1181 offset = vmf->pgoff << PAGE_SHIFT; 1182 if (offset >= rsv_schp->bufflen) 1183 return VM_FAULT_SIGBUS; 1184 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", 1185 offset, rsv_schp->k_use_sg)); 1186 sa = vma->vm_start; 1187 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1188 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1189 len = vma->vm_end - sa; 1190 len = (len < length) ? len : length; 1191 if (offset < len) { 1192 struct page *page = nth_page(rsv_schp->pages[k], 1193 offset >> PAGE_SHIFT); 1194 get_page(page); /* increment page count */ 1195 vmf->page = page; 1196 return 0; /* success */ 1197 } 1198 sa += len; 1199 offset -= len; 1200 } 1201 1202 return VM_FAULT_SIGBUS; 1203 } 1204 1205 static const struct vm_operations_struct sg_mmap_vm_ops = { 1206 .fault = sg_vma_fault, 1207 }; 1208 1209 static int 1210 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1211 { 1212 Sg_fd *sfp; 1213 unsigned long req_sz, len, sa; 1214 Sg_scatter_hold *rsv_schp; 1215 int k, length; 1216 1217 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1218 return -ENXIO; 1219 req_sz = vma->vm_end - vma->vm_start; 1220 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1221 (void *) vma->vm_start, (int) req_sz)); 1222 if (vma->vm_pgoff) 1223 return -EINVAL; /* want no offset */ 1224 rsv_schp = &sfp->reserve; 1225 if (req_sz > rsv_schp->bufflen) 1226 return -ENOMEM; /* cannot map more than reserved buffer */ 1227 1228 sa = vma->vm_start; 1229 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1230 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1231 len = vma->vm_end - sa; 1232 len = (len < length) ? len : length; 1233 sa += len; 1234 } 1235 1236 sfp->mmap_called = 1; 1237 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 1238 vma->vm_private_data = sfp; 1239 vma->vm_ops = &sg_mmap_vm_ops; 1240 return 0; 1241 } 1242 1243 static void sg_rq_end_io_usercontext(struct work_struct *work) 1244 { 1245 struct sg_request *srp = container_of(work, struct sg_request, ew.work); 1246 struct sg_fd *sfp = srp->parentfp; 1247 1248 sg_finish_rem_req(srp); 1249 kref_put(&sfp->f_ref, sg_remove_sfp); 1250 } 1251 1252 /* 1253 * This function is a "bottom half" handler that is called by the mid 1254 * level when a command is completed (or has failed). 1255 */ 1256 static void sg_rq_end_io(struct request *rq, int uptodate) 1257 { 1258 struct sg_request *srp = rq->end_io_data; 1259 Sg_device *sdp; 1260 Sg_fd *sfp; 1261 unsigned long iflags; 1262 unsigned int ms; 1263 char *sense; 1264 int result, resid, done = 1; 1265 1266 if (WARN_ON(srp->done != 0)) 1267 return; 1268 1269 sfp = srp->parentfp; 1270 if (WARN_ON(sfp == NULL)) 1271 return; 1272 1273 sdp = sfp->parentdp; 1274 if (unlikely(sdp->detached)) 1275 printk(KERN_INFO "sg_rq_end_io: device detached\n"); 1276 1277 sense = rq->sense; 1278 result = rq->errors; 1279 resid = rq->resid_len; 1280 1281 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1282 sdp->disk->disk_name, srp->header.pack_id, result)); 1283 srp->header.resid = resid; 1284 ms = jiffies_to_msecs(jiffies); 1285 srp->header.duration = (ms > srp->header.duration) ? 1286 (ms - srp->header.duration) : 0; 1287 if (0 != result) { 1288 struct scsi_sense_hdr sshdr; 1289 1290 srp->header.status = 0xff & result; 1291 srp->header.masked_status = status_byte(result); 1292 srp->header.msg_status = msg_byte(result); 1293 srp->header.host_status = host_byte(result); 1294 srp->header.driver_status = driver_byte(result); 1295 if ((sdp->sgdebug > 0) && 1296 ((CHECK_CONDITION == srp->header.masked_status) || 1297 (COMMAND_TERMINATED == srp->header.masked_status))) 1298 __scsi_print_sense("sg_cmd_done", sense, 1299 SCSI_SENSE_BUFFERSIZE); 1300 1301 /* Following if statement is a patch supplied by Eric Youngdale */ 1302 if (driver_byte(result) != 0 1303 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1304 && !scsi_sense_is_deferred(&sshdr) 1305 && sshdr.sense_key == UNIT_ATTENTION 1306 && sdp->device->removable) { 1307 /* Detected possible disc change. Set the bit - this */ 1308 /* may be used if there are filesystems using this device */ 1309 sdp->device->changed = 1; 1310 } 1311 } 1312 /* Rely on write phase to clean out srp status values, so no "else" */ 1313 1314 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1315 if (unlikely(srp->orphan)) { 1316 if (sfp->keep_orphan) 1317 srp->sg_io_owned = 0; 1318 else 1319 done = 0; 1320 } 1321 srp->done = done; 1322 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1323 1324 if (likely(done)) { 1325 /* Now wake up any sg_read() that is waiting for this 1326 * packet. 1327 */ 1328 wake_up_interruptible(&sfp->read_wait); 1329 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1330 kref_put(&sfp->f_ref, sg_remove_sfp); 1331 } else { 1332 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); 1333 schedule_work(&srp->ew.work); 1334 } 1335 } 1336 1337 static const struct file_operations sg_fops = { 1338 .owner = THIS_MODULE, 1339 .read = sg_read, 1340 .write = sg_write, 1341 .poll = sg_poll, 1342 .unlocked_ioctl = sg_ioctl, 1343 #ifdef CONFIG_COMPAT 1344 .compat_ioctl = sg_compat_ioctl, 1345 #endif 1346 .open = sg_open, 1347 .mmap = sg_mmap, 1348 .release = sg_release, 1349 .fasync = sg_fasync, 1350 .llseek = no_llseek, 1351 }; 1352 1353 static struct class *sg_sysfs_class; 1354 1355 static int sg_sysfs_valid = 0; 1356 1357 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1358 { 1359 struct request_queue *q = scsidp->request_queue; 1360 Sg_device *sdp; 1361 unsigned long iflags; 1362 int error; 1363 u32 k; 1364 1365 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1366 if (!sdp) { 1367 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1368 return ERR_PTR(-ENOMEM); 1369 } 1370 1371 idr_preload(GFP_KERNEL); 1372 write_lock_irqsave(&sg_index_lock, iflags); 1373 1374 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT); 1375 if (error < 0) { 1376 if (error == -ENOSPC) { 1377 sdev_printk(KERN_WARNING, scsidp, 1378 "Unable to attach sg device type=%d, minor number exceeds %d\n", 1379 scsidp->type, SG_MAX_DEVS - 1); 1380 error = -ENODEV; 1381 } else { 1382 printk(KERN_WARNING 1383 "idr allocation Sg_device failure: %d\n", error); 1384 } 1385 goto out_unlock; 1386 } 1387 k = error; 1388 1389 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1390 sprintf(disk->disk_name, "sg%d", k); 1391 disk->first_minor = k; 1392 sdp->disk = disk; 1393 sdp->device = scsidp; 1394 spin_lock_init(&sdp->sfd_lock); 1395 INIT_LIST_HEAD(&sdp->sfds); 1396 init_rwsem(&sdp->o_sem); 1397 sdp->sg_tablesize = queue_max_segments(q); 1398 sdp->index = k; 1399 kref_init(&sdp->d_ref); 1400 error = 0; 1401 1402 out_unlock: 1403 write_unlock_irqrestore(&sg_index_lock, iflags); 1404 idr_preload_end(); 1405 1406 if (error) { 1407 kfree(sdp); 1408 return ERR_PTR(error); 1409 } 1410 return sdp; 1411 } 1412 1413 static int 1414 sg_add(struct device *cl_dev, struct class_interface *cl_intf) 1415 { 1416 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1417 struct gendisk *disk; 1418 Sg_device *sdp = NULL; 1419 struct cdev * cdev = NULL; 1420 int error; 1421 unsigned long iflags; 1422 1423 disk = alloc_disk(1); 1424 if (!disk) { 1425 printk(KERN_WARNING "alloc_disk failed\n"); 1426 return -ENOMEM; 1427 } 1428 disk->major = SCSI_GENERIC_MAJOR; 1429 1430 error = -ENOMEM; 1431 cdev = cdev_alloc(); 1432 if (!cdev) { 1433 printk(KERN_WARNING "cdev_alloc failed\n"); 1434 goto out; 1435 } 1436 cdev->owner = THIS_MODULE; 1437 cdev->ops = &sg_fops; 1438 1439 sdp = sg_alloc(disk, scsidp); 1440 if (IS_ERR(sdp)) { 1441 printk(KERN_WARNING "sg_alloc failed\n"); 1442 error = PTR_ERR(sdp); 1443 goto out; 1444 } 1445 1446 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); 1447 if (error) 1448 goto cdev_add_err; 1449 1450 sdp->cdev = cdev; 1451 if (sg_sysfs_valid) { 1452 struct device *sg_class_member; 1453 1454 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, 1455 MKDEV(SCSI_GENERIC_MAJOR, 1456 sdp->index), 1457 sdp, "%s", disk->disk_name); 1458 if (IS_ERR(sg_class_member)) { 1459 printk(KERN_ERR "sg_add: " 1460 "device_create failed\n"); 1461 error = PTR_ERR(sg_class_member); 1462 goto cdev_add_err; 1463 } 1464 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1465 &sg_class_member->kobj, "generic"); 1466 if (error) 1467 printk(KERN_ERR "sg_add: unable to make symlink " 1468 "'generic' back to sg%d\n", sdp->index); 1469 } else 1470 printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); 1471 1472 sdev_printk(KERN_NOTICE, scsidp, 1473 "Attached scsi generic sg%d type %d\n", sdp->index, 1474 scsidp->type); 1475 1476 dev_set_drvdata(cl_dev, sdp); 1477 1478 return 0; 1479 1480 cdev_add_err: 1481 write_lock_irqsave(&sg_index_lock, iflags); 1482 idr_remove(&sg_index_idr, sdp->index); 1483 write_unlock_irqrestore(&sg_index_lock, iflags); 1484 kfree(sdp); 1485 1486 out: 1487 put_disk(disk); 1488 if (cdev) 1489 cdev_del(cdev); 1490 return error; 1491 } 1492 1493 static void sg_device_destroy(struct kref *kref) 1494 { 1495 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); 1496 unsigned long flags; 1497 1498 /* CAUTION! Note that the device can still be found via idr_find() 1499 * even though the refcount is 0. Therefore, do idr_remove() BEFORE 1500 * any other cleanup. 1501 */ 1502 1503 write_lock_irqsave(&sg_index_lock, flags); 1504 idr_remove(&sg_index_idr, sdp->index); 1505 write_unlock_irqrestore(&sg_index_lock, flags); 1506 1507 SCSI_LOG_TIMEOUT(3, 1508 printk("sg_device_destroy: %s\n", 1509 sdp->disk->disk_name)); 1510 1511 put_disk(sdp->disk); 1512 kfree(sdp); 1513 } 1514 1515 static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf) 1516 { 1517 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1518 Sg_device *sdp = dev_get_drvdata(cl_dev); 1519 unsigned long iflags; 1520 Sg_fd *sfp; 1521 1522 if (!sdp || sdp->detached) 1523 return; 1524 1525 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name)); 1526 1527 /* Need a write lock to set sdp->detached. */ 1528 write_lock_irqsave(&sg_index_lock, iflags); 1529 spin_lock(&sdp->sfd_lock); 1530 sdp->detached = 1; 1531 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { 1532 wake_up_interruptible(&sfp->read_wait); 1533 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); 1534 } 1535 spin_unlock(&sdp->sfd_lock); 1536 write_unlock_irqrestore(&sg_index_lock, iflags); 1537 1538 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1539 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); 1540 cdev_del(sdp->cdev); 1541 sdp->cdev = NULL; 1542 1543 sg_put_dev(sdp); 1544 } 1545 1546 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1547 module_param_named(def_reserved_size, def_reserved_size, int, 1548 S_IRUGO | S_IWUSR); 1549 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1550 1551 MODULE_AUTHOR("Douglas Gilbert"); 1552 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1553 MODULE_LICENSE("GPL"); 1554 MODULE_VERSION(SG_VERSION_STR); 1555 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1556 1557 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1558 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1559 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1560 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1561 1562 static int __init 1563 init_sg(void) 1564 { 1565 int rc; 1566 1567 if (scatter_elem_sz < PAGE_SIZE) { 1568 scatter_elem_sz = PAGE_SIZE; 1569 scatter_elem_sz_prev = scatter_elem_sz; 1570 } 1571 if (def_reserved_size >= 0) 1572 sg_big_buff = def_reserved_size; 1573 else 1574 def_reserved_size = sg_big_buff; 1575 1576 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1577 SG_MAX_DEVS, "sg"); 1578 if (rc) 1579 return rc; 1580 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1581 if ( IS_ERR(sg_sysfs_class) ) { 1582 rc = PTR_ERR(sg_sysfs_class); 1583 goto err_out; 1584 } 1585 sg_sysfs_valid = 1; 1586 rc = scsi_register_interface(&sg_interface); 1587 if (0 == rc) { 1588 #ifdef CONFIG_SCSI_PROC_FS 1589 sg_proc_init(); 1590 #endif /* CONFIG_SCSI_PROC_FS */ 1591 return 0; 1592 } 1593 class_destroy(sg_sysfs_class); 1594 err_out: 1595 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1596 return rc; 1597 } 1598 1599 static void __exit 1600 exit_sg(void) 1601 { 1602 #ifdef CONFIG_SCSI_PROC_FS 1603 sg_proc_cleanup(); 1604 #endif /* CONFIG_SCSI_PROC_FS */ 1605 scsi_unregister_interface(&sg_interface); 1606 class_destroy(sg_sysfs_class); 1607 sg_sysfs_valid = 0; 1608 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1609 SG_MAX_DEVS); 1610 idr_destroy(&sg_index_idr); 1611 } 1612 1613 static int sg_start_req(Sg_request *srp, unsigned char *cmd) 1614 { 1615 int res; 1616 struct request *rq; 1617 Sg_fd *sfp = srp->parentfp; 1618 sg_io_hdr_t *hp = &srp->header; 1619 int dxfer_len = (int) hp->dxfer_len; 1620 int dxfer_dir = hp->dxfer_direction; 1621 unsigned int iov_count = hp->iovec_count; 1622 Sg_scatter_hold *req_schp = &srp->data; 1623 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1624 struct request_queue *q = sfp->parentdp->device->request_queue; 1625 struct rq_map_data *md, map_data; 1626 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; 1627 1628 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n", 1629 dxfer_len)); 1630 1631 rq = blk_get_request(q, rw, GFP_ATOMIC); 1632 if (!rq) 1633 return -ENOMEM; 1634 1635 memcpy(rq->cmd, cmd, hp->cmd_len); 1636 1637 rq->cmd_len = hp->cmd_len; 1638 rq->cmd_type = REQ_TYPE_BLOCK_PC; 1639 1640 srp->rq = rq; 1641 rq->end_io_data = srp; 1642 rq->sense = srp->sense_b; 1643 rq->retries = SG_DEFAULT_RETRIES; 1644 1645 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1646 return 0; 1647 1648 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && 1649 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && 1650 !sfp->parentdp->device->host->unchecked_isa_dma && 1651 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) 1652 md = NULL; 1653 else 1654 md = &map_data; 1655 1656 if (md) { 1657 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) 1658 sg_link_reserve(sfp, srp, dxfer_len); 1659 else { 1660 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1661 if (res) 1662 return res; 1663 } 1664 1665 md->pages = req_schp->pages; 1666 md->page_order = req_schp->page_order; 1667 md->nr_entries = req_schp->k_use_sg; 1668 md->offset = 0; 1669 md->null_mapped = hp->dxferp ? 0 : 1; 1670 if (dxfer_dir == SG_DXFER_TO_FROM_DEV) 1671 md->from_user = 1; 1672 else 1673 md->from_user = 0; 1674 } 1675 1676 if (iov_count) { 1677 int len, size = sizeof(struct sg_iovec) * iov_count; 1678 struct iovec *iov; 1679 1680 iov = memdup_user(hp->dxferp, size); 1681 if (IS_ERR(iov)) 1682 return PTR_ERR(iov); 1683 1684 len = iov_length(iov, iov_count); 1685 if (hp->dxfer_len < len) { 1686 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len); 1687 len = hp->dxfer_len; 1688 } 1689 1690 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov, 1691 iov_count, 1692 len, GFP_ATOMIC); 1693 kfree(iov); 1694 } else 1695 res = blk_rq_map_user(q, rq, md, hp->dxferp, 1696 hp->dxfer_len, GFP_ATOMIC); 1697 1698 if (!res) { 1699 srp->bio = rq->bio; 1700 1701 if (!md) { 1702 req_schp->dio_in_use = 1; 1703 hp->info |= SG_INFO_DIRECT_IO; 1704 } 1705 } 1706 return res; 1707 } 1708 1709 static int sg_finish_rem_req(Sg_request * srp) 1710 { 1711 int ret = 0; 1712 1713 Sg_fd *sfp = srp->parentfp; 1714 Sg_scatter_hold *req_schp = &srp->data; 1715 1716 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1717 if (srp->rq) { 1718 if (srp->bio) 1719 ret = blk_rq_unmap_user(srp->bio); 1720 1721 blk_put_request(srp->rq); 1722 } 1723 1724 if (srp->res_used) 1725 sg_unlink_reserve(sfp, srp); 1726 else 1727 sg_remove_scat(req_schp); 1728 1729 sg_remove_request(sfp, srp); 1730 1731 return ret; 1732 } 1733 1734 static int 1735 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1736 { 1737 int sg_bufflen = tablesize * sizeof(struct page *); 1738 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1739 1740 schp->pages = kzalloc(sg_bufflen, gfp_flags); 1741 if (!schp->pages) 1742 return -ENOMEM; 1743 schp->sglist_len = sg_bufflen; 1744 return tablesize; /* number of scat_gath elements allocated */ 1745 } 1746 1747 static int 1748 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1749 { 1750 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; 1751 int sg_tablesize = sfp->parentdp->sg_tablesize; 1752 int blk_size = buff_size, order; 1753 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 1754 1755 if (blk_size < 0) 1756 return -EFAULT; 1757 if (0 == blk_size) 1758 ++blk_size; /* don't know why */ 1759 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1760 blk_size = ALIGN(blk_size, SG_SECTOR_SZ); 1761 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1762 buff_size, blk_size)); 1763 1764 /* N.B. ret_sz carried into this block ... */ 1765 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1766 if (mx_sc_elems < 0) 1767 return mx_sc_elems; /* most likely -ENOMEM */ 1768 1769 num = scatter_elem_sz; 1770 if (unlikely(num != scatter_elem_sz_prev)) { 1771 if (num < PAGE_SIZE) { 1772 scatter_elem_sz = PAGE_SIZE; 1773 scatter_elem_sz_prev = PAGE_SIZE; 1774 } else 1775 scatter_elem_sz_prev = num; 1776 } 1777 1778 if (sfp->low_dma) 1779 gfp_mask |= GFP_DMA; 1780 1781 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1782 gfp_mask |= __GFP_ZERO; 1783 1784 order = get_order(num); 1785 retry: 1786 ret_sz = 1 << (PAGE_SHIFT + order); 1787 1788 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; 1789 k++, rem_sz -= ret_sz) { 1790 1791 num = (rem_sz > scatter_elem_sz_prev) ? 1792 scatter_elem_sz_prev : rem_sz; 1793 1794 schp->pages[k] = alloc_pages(gfp_mask, order); 1795 if (!schp->pages[k]) 1796 goto out; 1797 1798 if (num == scatter_elem_sz_prev) { 1799 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1800 scatter_elem_sz = ret_sz; 1801 scatter_elem_sz_prev = ret_sz; 1802 } 1803 } 1804 1805 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " 1806 "ret_sz=%d\n", k, num, ret_sz)); 1807 } /* end of for loop */ 1808 1809 schp->page_order = order; 1810 schp->k_use_sg = k; 1811 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " 1812 "rem_sz=%d\n", k, rem_sz)); 1813 1814 schp->bufflen = blk_size; 1815 if (rem_sz > 0) /* must have failed */ 1816 return -ENOMEM; 1817 return 0; 1818 out: 1819 for (i = 0; i < k; i++) 1820 __free_pages(schp->pages[i], order); 1821 1822 if (--order >= 0) 1823 goto retry; 1824 1825 return -ENOMEM; 1826 } 1827 1828 static void 1829 sg_remove_scat(Sg_scatter_hold * schp) 1830 { 1831 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1832 if (schp->pages && schp->sglist_len > 0) { 1833 if (!schp->dio_in_use) { 1834 int k; 1835 1836 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1837 SCSI_LOG_TIMEOUT(5, printk( 1838 "sg_remove_scat: k=%d, pg=0x%p\n", 1839 k, schp->pages[k])); 1840 __free_pages(schp->pages[k], schp->page_order); 1841 } 1842 1843 kfree(schp->pages); 1844 } 1845 } 1846 memset(schp, 0, sizeof (*schp)); 1847 } 1848 1849 static int 1850 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 1851 { 1852 Sg_scatter_hold *schp = &srp->data; 1853 int k, num; 1854 1855 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 1856 num_read_xfer)); 1857 if ((!outp) || (num_read_xfer <= 0)) 1858 return 0; 1859 1860 num = 1 << (PAGE_SHIFT + schp->page_order); 1861 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1862 if (num > num_read_xfer) { 1863 if (__copy_to_user(outp, page_address(schp->pages[k]), 1864 num_read_xfer)) 1865 return -EFAULT; 1866 break; 1867 } else { 1868 if (__copy_to_user(outp, page_address(schp->pages[k]), 1869 num)) 1870 return -EFAULT; 1871 num_read_xfer -= num; 1872 if (num_read_xfer <= 0) 1873 break; 1874 outp += num; 1875 } 1876 } 1877 1878 return 0; 1879 } 1880 1881 static void 1882 sg_build_reserve(Sg_fd * sfp, int req_size) 1883 { 1884 Sg_scatter_hold *schp = &sfp->reserve; 1885 1886 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 1887 do { 1888 if (req_size < PAGE_SIZE) 1889 req_size = PAGE_SIZE; 1890 if (0 == sg_build_indirect(schp, sfp, req_size)) 1891 return; 1892 else 1893 sg_remove_scat(schp); 1894 req_size >>= 1; /* divide by 2 */ 1895 } while (req_size > (PAGE_SIZE / 2)); 1896 } 1897 1898 static void 1899 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 1900 { 1901 Sg_scatter_hold *req_schp = &srp->data; 1902 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1903 int k, num, rem; 1904 1905 srp->res_used = 1; 1906 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 1907 rem = size; 1908 1909 num = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1910 for (k = 0; k < rsv_schp->k_use_sg; k++) { 1911 if (rem <= num) { 1912 req_schp->k_use_sg = k + 1; 1913 req_schp->sglist_len = rsv_schp->sglist_len; 1914 req_schp->pages = rsv_schp->pages; 1915 1916 req_schp->bufflen = size; 1917 req_schp->page_order = rsv_schp->page_order; 1918 break; 1919 } else 1920 rem -= num; 1921 } 1922 1923 if (k >= rsv_schp->k_use_sg) 1924 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 1925 } 1926 1927 static void 1928 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 1929 { 1930 Sg_scatter_hold *req_schp = &srp->data; 1931 1932 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 1933 (int) req_schp->k_use_sg)); 1934 req_schp->k_use_sg = 0; 1935 req_schp->bufflen = 0; 1936 req_schp->pages = NULL; 1937 req_schp->page_order = 0; 1938 req_schp->sglist_len = 0; 1939 sfp->save_scat_len = 0; 1940 srp->res_used = 0; 1941 } 1942 1943 static Sg_request * 1944 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 1945 { 1946 Sg_request *resp; 1947 unsigned long iflags; 1948 1949 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1950 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 1951 /* look for requests that are ready + not SG_IO owned */ 1952 if ((1 == resp->done) && (!resp->sg_io_owned) && 1953 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 1954 resp->done = 2; /* guard against other readers */ 1955 break; 1956 } 1957 } 1958 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1959 return resp; 1960 } 1961 1962 /* always adds to end of list */ 1963 static Sg_request * 1964 sg_add_request(Sg_fd * sfp) 1965 { 1966 int k; 1967 unsigned long iflags; 1968 Sg_request *resp; 1969 Sg_request *rp = sfp->req_arr; 1970 1971 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1972 resp = sfp->headrp; 1973 if (!resp) { 1974 memset(rp, 0, sizeof (Sg_request)); 1975 rp->parentfp = sfp; 1976 resp = rp; 1977 sfp->headrp = resp; 1978 } else { 1979 if (0 == sfp->cmd_q) 1980 resp = NULL; /* command queuing disallowed */ 1981 else { 1982 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 1983 if (!rp->parentfp) 1984 break; 1985 } 1986 if (k < SG_MAX_QUEUE) { 1987 memset(rp, 0, sizeof (Sg_request)); 1988 rp->parentfp = sfp; 1989 while (resp->nextrp) 1990 resp = resp->nextrp; 1991 resp->nextrp = rp; 1992 resp = rp; 1993 } else 1994 resp = NULL; 1995 } 1996 } 1997 if (resp) { 1998 resp->nextrp = NULL; 1999 resp->header.duration = jiffies_to_msecs(jiffies); 2000 } 2001 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2002 return resp; 2003 } 2004 2005 /* Return of 1 for found; 0 for not found */ 2006 static int 2007 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2008 { 2009 Sg_request *prev_rp; 2010 Sg_request *rp; 2011 unsigned long iflags; 2012 int res = 0; 2013 2014 if ((!sfp) || (!srp) || (!sfp->headrp)) 2015 return res; 2016 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2017 prev_rp = sfp->headrp; 2018 if (srp == prev_rp) { 2019 sfp->headrp = prev_rp->nextrp; 2020 prev_rp->parentfp = NULL; 2021 res = 1; 2022 } else { 2023 while ((rp = prev_rp->nextrp)) { 2024 if (srp == rp) { 2025 prev_rp->nextrp = rp->nextrp; 2026 rp->parentfp = NULL; 2027 res = 1; 2028 break; 2029 } 2030 prev_rp = rp; 2031 } 2032 } 2033 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2034 return res; 2035 } 2036 2037 static Sg_fd * 2038 sg_add_sfp(Sg_device * sdp, int dev) 2039 { 2040 Sg_fd *sfp; 2041 unsigned long iflags; 2042 int bufflen; 2043 2044 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2045 if (!sfp) 2046 return ERR_PTR(-ENOMEM); 2047 2048 init_waitqueue_head(&sfp->read_wait); 2049 rwlock_init(&sfp->rq_list_lock); 2050 2051 kref_init(&sfp->f_ref); 2052 sfp->timeout = SG_DEFAULT_TIMEOUT; 2053 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2054 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2055 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2056 sdp->device->host->unchecked_isa_dma : 1; 2057 sfp->cmd_q = SG_DEF_COMMAND_Q; 2058 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2059 sfp->parentdp = sdp; 2060 spin_lock_irqsave(&sdp->sfd_lock, iflags); 2061 if (sdp->detached) { 2062 spin_unlock_irqrestore(&sdp->sfd_lock, iflags); 2063 return ERR_PTR(-ENODEV); 2064 } 2065 list_add_tail(&sfp->sfd_siblings, &sdp->sfds); 2066 spin_unlock_irqrestore(&sdp->sfd_lock, iflags); 2067 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2068 if (unlikely(sg_big_buff != def_reserved_size)) 2069 sg_big_buff = def_reserved_size; 2070 2071 bufflen = min_t(int, sg_big_buff, 2072 queue_max_sectors(sdp->device->request_queue) * 512); 2073 sg_build_reserve(sfp, bufflen); 2074 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2075 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2076 2077 kref_get(&sdp->d_ref); 2078 __module_get(THIS_MODULE); 2079 return sfp; 2080 } 2081 2082 static void sg_remove_sfp_usercontext(struct work_struct *work) 2083 { 2084 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); 2085 struct sg_device *sdp = sfp->parentdp; 2086 2087 /* Cleanup any responses which were never read(). */ 2088 while (sfp->headrp) 2089 sg_finish_rem_req(sfp->headrp); 2090 2091 if (sfp->reserve.bufflen > 0) { 2092 SCSI_LOG_TIMEOUT(6, 2093 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2094 (int) sfp->reserve.bufflen, 2095 (int) sfp->reserve.k_use_sg)); 2096 sg_remove_scat(&sfp->reserve); 2097 } 2098 2099 SCSI_LOG_TIMEOUT(6, 2100 printk("sg_remove_sfp: %s, sfp=0x%p\n", 2101 sdp->disk->disk_name, 2102 sfp)); 2103 kfree(sfp); 2104 2105 scsi_device_put(sdp->device); 2106 sg_put_dev(sdp); 2107 module_put(THIS_MODULE); 2108 } 2109 2110 static void sg_remove_sfp(struct kref *kref) 2111 { 2112 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); 2113 struct sg_device *sdp = sfp->parentdp; 2114 unsigned long iflags; 2115 2116 spin_lock_irqsave(&sdp->sfd_lock, iflags); 2117 list_del(&sfp->sfd_siblings); 2118 spin_unlock_irqrestore(&sdp->sfd_lock, iflags); 2119 2120 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); 2121 schedule_work(&sfp->ew.work); 2122 } 2123 2124 static int 2125 sg_res_in_use(Sg_fd * sfp) 2126 { 2127 const Sg_request *srp; 2128 unsigned long iflags; 2129 2130 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2131 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2132 if (srp->res_used) 2133 break; 2134 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2135 return srp ? 1 : 0; 2136 } 2137 2138 #ifdef CONFIG_SCSI_PROC_FS 2139 static int 2140 sg_idr_max_id(int id, void *p, void *data) 2141 { 2142 int *k = data; 2143 2144 if (*k < id) 2145 *k = id; 2146 2147 return 0; 2148 } 2149 2150 static int 2151 sg_last_dev(void) 2152 { 2153 int k = -1; 2154 unsigned long iflags; 2155 2156 read_lock_irqsave(&sg_index_lock, iflags); 2157 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2158 read_unlock_irqrestore(&sg_index_lock, iflags); 2159 return k + 1; /* origin 1 */ 2160 } 2161 #endif 2162 2163 /* must be called with sg_index_lock held */ 2164 static Sg_device *sg_lookup_dev(int dev) 2165 { 2166 return idr_find(&sg_index_idr, dev); 2167 } 2168 2169 static Sg_device *sg_get_dev(int dev) 2170 { 2171 struct sg_device *sdp; 2172 unsigned long flags; 2173 2174 read_lock_irqsave(&sg_index_lock, flags); 2175 sdp = sg_lookup_dev(dev); 2176 if (!sdp) 2177 sdp = ERR_PTR(-ENXIO); 2178 else if (sdp->detached) { 2179 /* If sdp->detached, then the refcount may already be 0, in 2180 * which case it would be a bug to do kref_get(). 2181 */ 2182 sdp = ERR_PTR(-ENODEV); 2183 } else 2184 kref_get(&sdp->d_ref); 2185 read_unlock_irqrestore(&sg_index_lock, flags); 2186 2187 return sdp; 2188 } 2189 2190 static void sg_put_dev(struct sg_device *sdp) 2191 { 2192 kref_put(&sdp->d_ref, sg_device_destroy); 2193 } 2194 2195 #ifdef CONFIG_SCSI_PROC_FS 2196 2197 static struct proc_dir_entry *sg_proc_sgp = NULL; 2198 2199 static char sg_proc_sg_dirname[] = "scsi/sg"; 2200 2201 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2202 2203 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2204 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2205 size_t count, loff_t *off); 2206 static const struct file_operations adio_fops = { 2207 .owner = THIS_MODULE, 2208 .open = sg_proc_single_open_adio, 2209 .read = seq_read, 2210 .llseek = seq_lseek, 2211 .write = sg_proc_write_adio, 2212 .release = single_release, 2213 }; 2214 2215 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2216 static ssize_t sg_proc_write_dressz(struct file *filp, 2217 const char __user *buffer, size_t count, loff_t *off); 2218 static const struct file_operations dressz_fops = { 2219 .owner = THIS_MODULE, 2220 .open = sg_proc_single_open_dressz, 2221 .read = seq_read, 2222 .llseek = seq_lseek, 2223 .write = sg_proc_write_dressz, 2224 .release = single_release, 2225 }; 2226 2227 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2228 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2229 static const struct file_operations version_fops = { 2230 .owner = THIS_MODULE, 2231 .open = sg_proc_single_open_version, 2232 .read = seq_read, 2233 .llseek = seq_lseek, 2234 .release = single_release, 2235 }; 2236 2237 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2238 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2239 static const struct file_operations devhdr_fops = { 2240 .owner = THIS_MODULE, 2241 .open = sg_proc_single_open_devhdr, 2242 .read = seq_read, 2243 .llseek = seq_lseek, 2244 .release = single_release, 2245 }; 2246 2247 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2248 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2249 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2250 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2251 static void dev_seq_stop(struct seq_file *s, void *v); 2252 static const struct file_operations dev_fops = { 2253 .owner = THIS_MODULE, 2254 .open = sg_proc_open_dev, 2255 .read = seq_read, 2256 .llseek = seq_lseek, 2257 .release = seq_release, 2258 }; 2259 static const struct seq_operations dev_seq_ops = { 2260 .start = dev_seq_start, 2261 .next = dev_seq_next, 2262 .stop = dev_seq_stop, 2263 .show = sg_proc_seq_show_dev, 2264 }; 2265 2266 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2267 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2268 static const struct file_operations devstrs_fops = { 2269 .owner = THIS_MODULE, 2270 .open = sg_proc_open_devstrs, 2271 .read = seq_read, 2272 .llseek = seq_lseek, 2273 .release = seq_release, 2274 }; 2275 static const struct seq_operations devstrs_seq_ops = { 2276 .start = dev_seq_start, 2277 .next = dev_seq_next, 2278 .stop = dev_seq_stop, 2279 .show = sg_proc_seq_show_devstrs, 2280 }; 2281 2282 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2283 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2284 static const struct file_operations debug_fops = { 2285 .owner = THIS_MODULE, 2286 .open = sg_proc_open_debug, 2287 .read = seq_read, 2288 .llseek = seq_lseek, 2289 .release = seq_release, 2290 }; 2291 static const struct seq_operations debug_seq_ops = { 2292 .start = dev_seq_start, 2293 .next = dev_seq_next, 2294 .stop = dev_seq_stop, 2295 .show = sg_proc_seq_show_debug, 2296 }; 2297 2298 2299 struct sg_proc_leaf { 2300 const char * name; 2301 const struct file_operations * fops; 2302 }; 2303 2304 static const struct sg_proc_leaf sg_proc_leaf_arr[] = { 2305 {"allow_dio", &adio_fops}, 2306 {"debug", &debug_fops}, 2307 {"def_reserved_size", &dressz_fops}, 2308 {"device_hdr", &devhdr_fops}, 2309 {"devices", &dev_fops}, 2310 {"device_strs", &devstrs_fops}, 2311 {"version", &version_fops} 2312 }; 2313 2314 static int 2315 sg_proc_init(void) 2316 { 2317 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2318 int k; 2319 2320 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2321 if (!sg_proc_sgp) 2322 return 1; 2323 for (k = 0; k < num_leaves; ++k) { 2324 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k]; 2325 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2326 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); 2327 } 2328 return 0; 2329 } 2330 2331 static void 2332 sg_proc_cleanup(void) 2333 { 2334 int k; 2335 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2336 2337 if (!sg_proc_sgp) 2338 return; 2339 for (k = 0; k < num_leaves; ++k) 2340 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2341 remove_proc_entry(sg_proc_sg_dirname, NULL); 2342 } 2343 2344 2345 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2346 { 2347 seq_printf(s, "%d\n", *((int *)s->private)); 2348 return 0; 2349 } 2350 2351 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2352 { 2353 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2354 } 2355 2356 static ssize_t 2357 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2358 size_t count, loff_t *off) 2359 { 2360 int err; 2361 unsigned long num; 2362 2363 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2364 return -EACCES; 2365 err = kstrtoul_from_user(buffer, count, 0, &num); 2366 if (err) 2367 return err; 2368 sg_allow_dio = num ? 1 : 0; 2369 return count; 2370 } 2371 2372 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2373 { 2374 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2375 } 2376 2377 static ssize_t 2378 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2379 size_t count, loff_t *off) 2380 { 2381 int err; 2382 unsigned long k = ULONG_MAX; 2383 2384 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2385 return -EACCES; 2386 2387 err = kstrtoul_from_user(buffer, count, 0, &k); 2388 if (err) 2389 return err; 2390 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2391 sg_big_buff = k; 2392 return count; 2393 } 2394 return -ERANGE; 2395 } 2396 2397 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2398 { 2399 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2400 sg_version_date); 2401 return 0; 2402 } 2403 2404 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2405 { 2406 return single_open(file, sg_proc_seq_show_version, NULL); 2407 } 2408 2409 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2410 { 2411 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2412 "online\n"); 2413 return 0; 2414 } 2415 2416 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2417 { 2418 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2419 } 2420 2421 struct sg_proc_deviter { 2422 loff_t index; 2423 size_t max; 2424 }; 2425 2426 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2427 { 2428 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2429 2430 s->private = it; 2431 if (! it) 2432 return NULL; 2433 2434 it->index = *pos; 2435 it->max = sg_last_dev(); 2436 if (it->index >= it->max) 2437 return NULL; 2438 return it; 2439 } 2440 2441 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2442 { 2443 struct sg_proc_deviter * it = s->private; 2444 2445 *pos = ++it->index; 2446 return (it->index < it->max) ? it : NULL; 2447 } 2448 2449 static void dev_seq_stop(struct seq_file *s, void *v) 2450 { 2451 kfree(s->private); 2452 } 2453 2454 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2455 { 2456 return seq_open(file, &dev_seq_ops); 2457 } 2458 2459 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2460 { 2461 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2462 Sg_device *sdp; 2463 struct scsi_device *scsidp; 2464 unsigned long iflags; 2465 2466 read_lock_irqsave(&sg_index_lock, iflags); 2467 sdp = it ? sg_lookup_dev(it->index) : NULL; 2468 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2469 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2470 scsidp->host->host_no, scsidp->channel, 2471 scsidp->id, scsidp->lun, (int) scsidp->type, 2472 1, 2473 (int) scsidp->queue_depth, 2474 (int) scsidp->device_busy, 2475 (int) scsi_device_online(scsidp)); 2476 else 2477 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2478 read_unlock_irqrestore(&sg_index_lock, iflags); 2479 return 0; 2480 } 2481 2482 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2483 { 2484 return seq_open(file, &devstrs_seq_ops); 2485 } 2486 2487 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2488 { 2489 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2490 Sg_device *sdp; 2491 struct scsi_device *scsidp; 2492 unsigned long iflags; 2493 2494 read_lock_irqsave(&sg_index_lock, iflags); 2495 sdp = it ? sg_lookup_dev(it->index) : NULL; 2496 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2497 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2498 scsidp->vendor, scsidp->model, scsidp->rev); 2499 else 2500 seq_printf(s, "<no active device>\n"); 2501 read_unlock_irqrestore(&sg_index_lock, iflags); 2502 return 0; 2503 } 2504 2505 /* must be called while holding sg_index_lock and sfd_lock */ 2506 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2507 { 2508 int k, m, new_interface, blen, usg; 2509 Sg_request *srp; 2510 Sg_fd *fp; 2511 const sg_io_hdr_t *hp; 2512 const char * cp; 2513 unsigned int ms; 2514 2515 k = 0; 2516 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { 2517 k++; 2518 read_lock(&fp->rq_list_lock); /* irqs already disabled */ 2519 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2520 "(res)sgat=%d low_dma=%d\n", k, 2521 jiffies_to_msecs(fp->timeout), 2522 fp->reserve.bufflen, 2523 (int) fp->reserve.k_use_sg, 2524 (int) fp->low_dma); 2525 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n", 2526 (int) fp->cmd_q, (int) fp->force_packid, 2527 (int) fp->keep_orphan); 2528 for (m = 0, srp = fp->headrp; 2529 srp != NULL; 2530 ++m, srp = srp->nextrp) { 2531 hp = &srp->header; 2532 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2533 if (srp->res_used) { 2534 if (new_interface && 2535 (SG_FLAG_MMAP_IO & hp->flags)) 2536 cp = " mmap>> "; 2537 else 2538 cp = " rb>> "; 2539 } else { 2540 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2541 cp = " dio>> "; 2542 else 2543 cp = " "; 2544 } 2545 seq_printf(s, cp); 2546 blen = srp->data.bufflen; 2547 usg = srp->data.k_use_sg; 2548 seq_printf(s, srp->done ? 2549 ((1 == srp->done) ? "rcv:" : "fin:") 2550 : "act:"); 2551 seq_printf(s, " id=%d blen=%d", 2552 srp->header.pack_id, blen); 2553 if (srp->done) 2554 seq_printf(s, " dur=%d", hp->duration); 2555 else { 2556 ms = jiffies_to_msecs(jiffies); 2557 seq_printf(s, " t_o/elap=%d/%d", 2558 (new_interface ? hp->timeout : 2559 jiffies_to_msecs(fp->timeout)), 2560 (ms > hp->duration ? ms - hp->duration : 0)); 2561 } 2562 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2563 (int) srp->data.cmd_opcode); 2564 } 2565 if (0 == m) 2566 seq_printf(s, " No requests active\n"); 2567 read_unlock(&fp->rq_list_lock); 2568 } 2569 } 2570 2571 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2572 { 2573 return seq_open(file, &debug_seq_ops); 2574 } 2575 2576 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2577 { 2578 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2579 Sg_device *sdp; 2580 unsigned long iflags; 2581 2582 if (it && (0 == it->index)) { 2583 seq_printf(s, "max_active_device=%d(origin 1)\n", 2584 (int)it->max); 2585 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2586 } 2587 2588 read_lock_irqsave(&sg_index_lock, iflags); 2589 sdp = it ? sg_lookup_dev(it->index) : NULL; 2590 if (sdp) { 2591 spin_lock(&sdp->sfd_lock); 2592 if (!list_empty(&sdp->sfds)) { 2593 struct scsi_device *scsidp = sdp->device; 2594 2595 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); 2596 if (sdp->detached) 2597 seq_printf(s, "detached pending close "); 2598 else 2599 seq_printf 2600 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2601 scsidp->host->host_no, 2602 scsidp->channel, scsidp->id, 2603 scsidp->lun, 2604 scsidp->host->hostt->emulated); 2605 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2606 sdp->sg_tablesize, sdp->exclude); 2607 sg_proc_debug_helper(s, sdp); 2608 } 2609 spin_unlock(&sdp->sfd_lock); 2610 } 2611 read_unlock_irqrestore(&sg_index_lock, iflags); 2612 return 0; 2613 } 2614 2615 #endif /* CONFIG_SCSI_PROC_FS */ 2616 2617 module_init(init_sg); 2618 module_exit(exit_sg); 2619