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