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/scatterlist.h> 51 52 #include "scsi.h" 53 #include <scsi/scsi_dbg.h> 54 #include <scsi/scsi_host.h> 55 #include <scsi/scsi_driver.h> 56 #include <scsi/scsi_ioctl.h> 57 #include <scsi/sg.h> 58 59 #include "scsi_logging.h" 60 61 #ifdef CONFIG_SCSI_PROC_FS 62 #include <linux/proc_fs.h> 63 static char *sg_version_date = "20061027"; 64 65 static int sg_proc_init(void); 66 static void sg_proc_cleanup(void); 67 #endif 68 69 #define SG_ALLOW_DIO_DEF 0 70 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */ 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 class_device *, struct class_interface *); 104 static void sg_remove(struct class_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 = sg_add, 112 .remove = 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 unsigned b_malloc_len; /* actual len malloc'ed in buffer */ 120 struct scatterlist *buffer;/* scatter list */ 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 } Sg_request; 139 140 typedef struct sg_fd { /* holds the state of a file descriptor */ 141 struct sg_fd *nextfp; /* NULL when last opened fd on this device */ 142 struct sg_device *parentdp; /* owning device */ 143 wait_queue_head_t read_wait; /* queue read until command done */ 144 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 145 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 146 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 147 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 148 unsigned save_scat_len; /* original length of trunc. scat. element */ 149 Sg_request *headrp; /* head of request slist, NULL->empty */ 150 struct fasync_struct *async_qp; /* used by asynchronous notification */ 151 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 152 char low_dma; /* as in parent but possibly overridden to 1 */ 153 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 154 volatile char closed; /* 1 -> fd closed but request(s) outstanding */ 155 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 156 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ 157 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 158 char mmap_called; /* 0 -> mmap() never called on this fd */ 159 } Sg_fd; 160 161 typedef struct sg_device { /* holds the state of each scsi generic device */ 162 struct scsi_device *device; 163 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ 164 int sg_tablesize; /* adapter's max scatter-gather table size */ 165 u32 index; /* device index number */ 166 Sg_fd *headfp; /* first open fd belonging to this device */ 167 volatile char detached; /* 0->attached, 1->detached pending removal */ 168 volatile char exclude; /* opened for exclusive access */ 169 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 170 struct gendisk *disk; 171 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 172 } Sg_device; 173 174 static int sg_fasync(int fd, struct file *filp, int mode); 175 /* tasklet or soft irq callback */ 176 static void sg_cmd_done(void *data, char *sense, int result, int resid); 177 static int sg_start_req(Sg_request * srp); 178 static void sg_finish_rem_req(Sg_request * srp); 179 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 180 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, 181 int tablesize); 182 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 183 Sg_request * srp); 184 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 185 int blocking, int read_only, Sg_request ** o_srp); 186 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 187 unsigned char *cmnd, int timeout, int blocking); 188 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 189 int wr_xf, int *countp, unsigned char __user **up); 190 static int sg_write_xfer(Sg_request * srp); 191 static int sg_read_xfer(Sg_request * srp); 192 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 193 static void sg_remove_scat(Sg_scatter_hold * schp); 194 static void sg_build_reserve(Sg_fd * sfp, int req_size); 195 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 196 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 197 static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp); 198 static void sg_page_free(struct page *page, int size); 199 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 200 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 201 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 202 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 203 static Sg_request *sg_add_request(Sg_fd * sfp); 204 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 205 static int sg_res_in_use(Sg_fd * sfp); 206 static int sg_allow_access(unsigned char opcode, char dev_type); 207 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); 208 static Sg_device *sg_get_dev(int dev); 209 #ifdef CONFIG_SCSI_PROC_FS 210 static int sg_last_dev(void); 211 #endif 212 213 #define SZ_SG_HEADER sizeof(struct sg_header) 214 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 215 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 216 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 217 218 static int 219 sg_open(struct inode *inode, struct file *filp) 220 { 221 int dev = iminor(inode); 222 int flags = filp->f_flags; 223 struct request_queue *q; 224 Sg_device *sdp; 225 Sg_fd *sfp; 226 int res; 227 int retval; 228 229 nonseekable_open(inode, filp); 230 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 231 sdp = sg_get_dev(dev); 232 if ((!sdp) || (!sdp->device)) 233 return -ENXIO; 234 if (sdp->detached) 235 return -ENODEV; 236 237 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 238 /* Prevent the device driver from vanishing while we sleep */ 239 retval = scsi_device_get(sdp->device); 240 if (retval) 241 return retval; 242 243 if (!((flags & O_NONBLOCK) || 244 scsi_block_when_processing_errors(sdp->device))) { 245 retval = -ENXIO; 246 /* we are in error recovery for this device */ 247 goto error_out; 248 } 249 250 if (flags & O_EXCL) { 251 if (O_RDONLY == (flags & O_ACCMODE)) { 252 retval = -EPERM; /* Can't lock it with read only access */ 253 goto error_out; 254 } 255 if (sdp->headfp && (flags & O_NONBLOCK)) { 256 retval = -EBUSY; 257 goto error_out; 258 } 259 res = 0; 260 __wait_event_interruptible(sdp->o_excl_wait, 261 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); 262 if (res) { 263 retval = res; /* -ERESTARTSYS because signal hit process */ 264 goto error_out; 265 } 266 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ 267 if (flags & O_NONBLOCK) { 268 retval = -EBUSY; 269 goto error_out; 270 } 271 res = 0; 272 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), 273 res); 274 if (res) { 275 retval = res; /* -ERESTARTSYS because signal hit process */ 276 goto error_out; 277 } 278 } 279 if (sdp->detached) { 280 retval = -ENODEV; 281 goto error_out; 282 } 283 if (!sdp->headfp) { /* no existing opens on this device */ 284 sdp->sgdebug = 0; 285 q = sdp->device->request_queue; 286 sdp->sg_tablesize = min(q->max_hw_segments, 287 q->max_phys_segments); 288 } 289 if ((sfp = sg_add_sfp(sdp, dev))) 290 filp->private_data = sfp; 291 else { 292 if (flags & O_EXCL) 293 sdp->exclude = 0; /* undo if error */ 294 retval = -ENOMEM; 295 goto error_out; 296 } 297 return 0; 298 299 error_out: 300 scsi_device_put(sdp->device); 301 return retval; 302 } 303 304 /* Following function was formerly called 'sg_close' */ 305 static int 306 sg_release(struct inode *inode, struct file *filp) 307 { 308 Sg_device *sdp; 309 Sg_fd *sfp; 310 311 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 312 return -ENXIO; 313 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 314 sg_fasync(-1, filp, 0); /* remove filp from async notification list */ 315 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ 316 if (!sdp->detached) { 317 scsi_device_put(sdp->device); 318 } 319 sdp->exclude = 0; 320 wake_up_interruptible(&sdp->o_excl_wait); 321 } 322 return 0; 323 } 324 325 static ssize_t 326 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 327 { 328 Sg_device *sdp; 329 Sg_fd *sfp; 330 Sg_request *srp; 331 int req_pack_id = -1; 332 sg_io_hdr_t *hp; 333 struct sg_header *old_hdr = NULL; 334 int retval = 0; 335 336 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 337 return -ENXIO; 338 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 339 sdp->disk->disk_name, (int) count)); 340 341 if (!access_ok(VERIFY_WRITE, buf, count)) 342 return -EFAULT; 343 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 344 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 345 if (!old_hdr) 346 return -ENOMEM; 347 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 348 retval = -EFAULT; 349 goto free_old_hdr; 350 } 351 if (old_hdr->reply_len < 0) { 352 if (count >= SZ_SG_IO_HDR) { 353 sg_io_hdr_t *new_hdr; 354 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 355 if (!new_hdr) { 356 retval = -ENOMEM; 357 goto free_old_hdr; 358 } 359 retval =__copy_from_user 360 (new_hdr, buf, SZ_SG_IO_HDR); 361 req_pack_id = new_hdr->pack_id; 362 kfree(new_hdr); 363 if (retval) { 364 retval = -EFAULT; 365 goto free_old_hdr; 366 } 367 } 368 } else 369 req_pack_id = old_hdr->pack_id; 370 } 371 srp = sg_get_rq_mark(sfp, req_pack_id); 372 if (!srp) { /* now wait on packet to arrive */ 373 if (sdp->detached) { 374 retval = -ENODEV; 375 goto free_old_hdr; 376 } 377 if (filp->f_flags & O_NONBLOCK) { 378 retval = -EAGAIN; 379 goto free_old_hdr; 380 } 381 while (1) { 382 retval = 0; /* following macro beats race condition */ 383 __wait_event_interruptible(sfp->read_wait, 384 (sdp->detached || 385 (srp = sg_get_rq_mark(sfp, req_pack_id))), 386 retval); 387 if (sdp->detached) { 388 retval = -ENODEV; 389 goto free_old_hdr; 390 } 391 if (0 == retval) 392 break; 393 394 /* -ERESTARTSYS as signal hit process */ 395 goto free_old_hdr; 396 } 397 } 398 if (srp->header.interface_id != '\0') { 399 retval = sg_new_read(sfp, buf, count, srp); 400 goto free_old_hdr; 401 } 402 403 hp = &srp->header; 404 if (old_hdr == NULL) { 405 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 406 if (! old_hdr) { 407 retval = -ENOMEM; 408 goto free_old_hdr; 409 } 410 } 411 memset(old_hdr, 0, SZ_SG_HEADER); 412 old_hdr->reply_len = (int) hp->timeout; 413 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 414 old_hdr->pack_id = hp->pack_id; 415 old_hdr->twelve_byte = 416 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 417 old_hdr->target_status = hp->masked_status; 418 old_hdr->host_status = hp->host_status; 419 old_hdr->driver_status = hp->driver_status; 420 if ((CHECK_CONDITION & hp->masked_status) || 421 (DRIVER_SENSE & hp->driver_status)) 422 memcpy(old_hdr->sense_buffer, srp->sense_b, 423 sizeof (old_hdr->sense_buffer)); 424 switch (hp->host_status) { 425 /* This setup of 'result' is for backward compatibility and is best 426 ignored by the user who should use target, host + driver status */ 427 case DID_OK: 428 case DID_PASSTHROUGH: 429 case DID_SOFT_ERROR: 430 old_hdr->result = 0; 431 break; 432 case DID_NO_CONNECT: 433 case DID_BUS_BUSY: 434 case DID_TIME_OUT: 435 old_hdr->result = EBUSY; 436 break; 437 case DID_BAD_TARGET: 438 case DID_ABORT: 439 case DID_PARITY: 440 case DID_RESET: 441 case DID_BAD_INTR: 442 old_hdr->result = EIO; 443 break; 444 case DID_ERROR: 445 old_hdr->result = (srp->sense_b[0] == 0 && 446 hp->masked_status == GOOD) ? 0 : EIO; 447 break; 448 default: 449 old_hdr->result = EIO; 450 break; 451 } 452 453 /* Now copy the result back to the user buffer. */ 454 if (count >= SZ_SG_HEADER) { 455 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 456 retval = -EFAULT; 457 goto free_old_hdr; 458 } 459 buf += SZ_SG_HEADER; 460 if (count > old_hdr->reply_len) 461 count = old_hdr->reply_len; 462 if (count > SZ_SG_HEADER) { 463 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 464 retval = -EFAULT; 465 goto free_old_hdr; 466 } 467 } 468 } else 469 count = (old_hdr->result == 0) ? 0 : -EIO; 470 sg_finish_rem_req(srp); 471 retval = count; 472 free_old_hdr: 473 kfree(old_hdr); 474 return retval; 475 } 476 477 static ssize_t 478 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 479 { 480 sg_io_hdr_t *hp = &srp->header; 481 int err = 0; 482 int len; 483 484 if (count < SZ_SG_IO_HDR) { 485 err = -EINVAL; 486 goto err_out; 487 } 488 hp->sb_len_wr = 0; 489 if ((hp->mx_sb_len > 0) && hp->sbp) { 490 if ((CHECK_CONDITION & hp->masked_status) || 491 (DRIVER_SENSE & hp->driver_status)) { 492 int sb_len = SCSI_SENSE_BUFFERSIZE; 493 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 494 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 495 len = (len > sb_len) ? sb_len : len; 496 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 497 err = -EFAULT; 498 goto err_out; 499 } 500 hp->sb_len_wr = len; 501 } 502 } 503 if (hp->masked_status || hp->host_status || hp->driver_status) 504 hp->info |= SG_INFO_CHECK; 505 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 506 err = -EFAULT; 507 goto err_out; 508 } 509 err = sg_read_xfer(srp); 510 err_out: 511 sg_finish_rem_req(srp); 512 return (0 == err) ? count : err; 513 } 514 515 static ssize_t 516 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 517 { 518 int mxsize, cmd_size, k; 519 int input_size, blocking; 520 unsigned char opcode; 521 Sg_device *sdp; 522 Sg_fd *sfp; 523 Sg_request *srp; 524 struct sg_header old_hdr; 525 sg_io_hdr_t *hp; 526 unsigned char cmnd[MAX_COMMAND_SIZE]; 527 528 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 529 return -ENXIO; 530 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 531 sdp->disk->disk_name, (int) count)); 532 if (sdp->detached) 533 return -ENODEV; 534 if (!((filp->f_flags & O_NONBLOCK) || 535 scsi_block_when_processing_errors(sdp->device))) 536 return -ENXIO; 537 538 if (!access_ok(VERIFY_READ, buf, count)) 539 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 540 if (count < SZ_SG_HEADER) 541 return -EIO; 542 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 543 return -EFAULT; 544 blocking = !(filp->f_flags & O_NONBLOCK); 545 if (old_hdr.reply_len < 0) 546 return sg_new_write(sfp, buf, count, blocking, 0, NULL); 547 if (count < (SZ_SG_HEADER + 6)) 548 return -EIO; /* The minimum scsi command length is 6 bytes. */ 549 550 if (!(srp = sg_add_request(sfp))) { 551 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 552 return -EDOM; 553 } 554 buf += SZ_SG_HEADER; 555 __get_user(opcode, buf); 556 if (sfp->next_cmd_len > 0) { 557 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 558 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 559 sfp->next_cmd_len = 0; 560 sg_remove_request(sfp, srp); 561 return -EIO; 562 } 563 cmd_size = sfp->next_cmd_len; 564 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 565 } else { 566 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 567 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 568 cmd_size = 12; 569 } 570 SCSI_LOG_TIMEOUT(4, printk( 571 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 572 /* Determine buffer size. */ 573 input_size = count - cmd_size; 574 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 575 mxsize -= SZ_SG_HEADER; 576 input_size -= SZ_SG_HEADER; 577 if (input_size < 0) { 578 sg_remove_request(sfp, srp); 579 return -EIO; /* User did not pass enough bytes for this command. */ 580 } 581 hp = &srp->header; 582 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 583 hp->cmd_len = (unsigned char) cmd_size; 584 hp->iovec_count = 0; 585 hp->mx_sb_len = 0; 586 if (input_size > 0) 587 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 588 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 589 else 590 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 591 hp->dxfer_len = mxsize; 592 hp->dxferp = (char __user *)buf + cmd_size; 593 hp->sbp = NULL; 594 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 595 hp->flags = input_size; /* structure abuse ... */ 596 hp->pack_id = old_hdr.pack_id; 597 hp->usr_ptr = NULL; 598 if (__copy_from_user(cmnd, buf, cmd_size)) 599 return -EFAULT; 600 /* 601 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 602 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 603 * is a non-zero input_size, so emit a warning. 604 */ 605 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) 606 if (printk_ratelimit()) 607 printk(KERN_WARNING 608 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" 609 "guessing data in;\n" KERN_WARNING " " 610 "program %s not setting count and/or reply_len properly\n", 611 old_hdr.reply_len - (int)SZ_SG_HEADER, 612 input_size, (unsigned int) cmnd[0], 613 current->comm); 614 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 615 return (k < 0) ? k : count; 616 } 617 618 static ssize_t 619 sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 620 int blocking, int read_only, Sg_request ** o_srp) 621 { 622 int k; 623 Sg_request *srp; 624 sg_io_hdr_t *hp; 625 unsigned char cmnd[MAX_COMMAND_SIZE]; 626 int timeout; 627 unsigned long ul_timeout; 628 629 if (count < SZ_SG_IO_HDR) 630 return -EINVAL; 631 if (!access_ok(VERIFY_READ, buf, count)) 632 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 633 634 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 635 if (!(srp = sg_add_request(sfp))) { 636 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 637 return -EDOM; 638 } 639 hp = &srp->header; 640 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 641 sg_remove_request(sfp, srp); 642 return -EFAULT; 643 } 644 if (hp->interface_id != 'S') { 645 sg_remove_request(sfp, srp); 646 return -ENOSYS; 647 } 648 if (hp->flags & SG_FLAG_MMAP_IO) { 649 if (hp->dxfer_len > sfp->reserve.bufflen) { 650 sg_remove_request(sfp, srp); 651 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 652 } 653 if (hp->flags & SG_FLAG_DIRECT_IO) { 654 sg_remove_request(sfp, srp); 655 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 656 } 657 if (sg_res_in_use(sfp)) { 658 sg_remove_request(sfp, srp); 659 return -EBUSY; /* reserve buffer already being used */ 660 } 661 } 662 ul_timeout = msecs_to_jiffies(srp->header.timeout); 663 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 664 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 665 sg_remove_request(sfp, srp); 666 return -EMSGSIZE; 667 } 668 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 669 sg_remove_request(sfp, srp); 670 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 671 } 672 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 673 sg_remove_request(sfp, srp); 674 return -EFAULT; 675 } 676 if (read_only && 677 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) { 678 sg_remove_request(sfp, srp); 679 return -EPERM; 680 } 681 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 682 if (k < 0) 683 return k; 684 if (o_srp) 685 *o_srp = srp; 686 return count; 687 } 688 689 static int 690 sg_common_write(Sg_fd * sfp, Sg_request * srp, 691 unsigned char *cmnd, int timeout, int blocking) 692 { 693 int k, data_dir; 694 Sg_device *sdp = sfp->parentdp; 695 sg_io_hdr_t *hp = &srp->header; 696 697 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 698 hp->status = 0; 699 hp->masked_status = 0; 700 hp->msg_status = 0; 701 hp->info = 0; 702 hp->host_status = 0; 703 hp->driver_status = 0; 704 hp->resid = 0; 705 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 706 (int) cmnd[0], (int) hp->cmd_len)); 707 708 if ((k = sg_start_req(srp))) { 709 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); 710 sg_finish_rem_req(srp); 711 return k; /* probably out of space --> ENOMEM */ 712 } 713 if ((k = sg_write_xfer(srp))) { 714 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n")); 715 sg_finish_rem_req(srp); 716 return k; 717 } 718 if (sdp->detached) { 719 sg_finish_rem_req(srp); 720 return -ENODEV; 721 } 722 723 switch (hp->dxfer_direction) { 724 case SG_DXFER_TO_FROM_DEV: 725 case SG_DXFER_FROM_DEV: 726 data_dir = DMA_FROM_DEVICE; 727 break; 728 case SG_DXFER_TO_DEV: 729 data_dir = DMA_TO_DEVICE; 730 break; 731 case SG_DXFER_UNKNOWN: 732 data_dir = DMA_BIDIRECTIONAL; 733 break; 734 default: 735 data_dir = DMA_NONE; 736 break; 737 } 738 hp->duration = jiffies_to_msecs(jiffies); 739 /* Now send everything of to mid-level. The next time we hear about this 740 packet is when sg_cmd_done() is called (i.e. a callback). */ 741 if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer, 742 hp->dxfer_len, srp->data.k_use_sg, timeout, 743 SG_DEFAULT_RETRIES, srp, sg_cmd_done, 744 GFP_ATOMIC)) { 745 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n")); 746 /* 747 * most likely out of mem, but could also be a bad map 748 */ 749 sg_finish_rem_req(srp); 750 return -ENOMEM; 751 } else 752 return 0; 753 } 754 755 static int 756 sg_srp_done(Sg_request *srp, Sg_fd *sfp) 757 { 758 unsigned long iflags; 759 int done; 760 761 read_lock_irqsave(&sfp->rq_list_lock, iflags); 762 done = srp->done; 763 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 764 return done; 765 } 766 767 static int 768 sg_ioctl(struct inode *inode, struct file *filp, 769 unsigned int cmd_in, unsigned long arg) 770 { 771 void __user *p = (void __user *)arg; 772 int __user *ip = p; 773 int result, val, read_only; 774 Sg_device *sdp; 775 Sg_fd *sfp; 776 Sg_request *srp; 777 unsigned long iflags; 778 779 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 780 return -ENXIO; 781 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 782 sdp->disk->disk_name, (int) cmd_in)); 783 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 784 785 switch (cmd_in) { 786 case SG_IO: 787 { 788 int blocking = 1; /* ignore O_NONBLOCK flag */ 789 790 if (sdp->detached) 791 return -ENODEV; 792 if (!scsi_block_when_processing_errors(sdp->device)) 793 return -ENXIO; 794 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 795 return -EFAULT; 796 result = 797 sg_new_write(sfp, p, SZ_SG_IO_HDR, 798 blocking, read_only, &srp); 799 if (result < 0) 800 return result; 801 srp->sg_io_owned = 1; 802 while (1) { 803 result = 0; /* following macro to beat race condition */ 804 __wait_event_interruptible(sfp->read_wait, 805 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), 806 result); 807 if (sdp->detached) 808 return -ENODEV; 809 if (sfp->closed) 810 return 0; /* request packet dropped already */ 811 if (0 == result) 812 break; 813 srp->orphan = 1; 814 return result; /* -ERESTARTSYS because signal hit process */ 815 } 816 write_lock_irqsave(&sfp->rq_list_lock, iflags); 817 srp->done = 2; 818 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 819 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 820 return (result < 0) ? result : 0; 821 } 822 case SG_SET_TIMEOUT: 823 result = get_user(val, ip); 824 if (result) 825 return result; 826 if (val < 0) 827 return -EIO; 828 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 829 val = MULDIV (INT_MAX, USER_HZ, HZ); 830 sfp->timeout_user = val; 831 sfp->timeout = MULDIV (val, HZ, USER_HZ); 832 833 return 0; 834 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 835 /* strange ..., for backward compatibility */ 836 return sfp->timeout_user; 837 case SG_SET_FORCE_LOW_DMA: 838 result = get_user(val, ip); 839 if (result) 840 return result; 841 if (val) { 842 sfp->low_dma = 1; 843 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 844 val = (int) sfp->reserve.bufflen; 845 sg_remove_scat(&sfp->reserve); 846 sg_build_reserve(sfp, val); 847 } 848 } else { 849 if (sdp->detached) 850 return -ENODEV; 851 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 852 } 853 return 0; 854 case SG_GET_LOW_DMA: 855 return put_user((int) sfp->low_dma, ip); 856 case SG_GET_SCSI_ID: 857 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 858 return -EFAULT; 859 else { 860 sg_scsi_id_t __user *sg_idp = p; 861 862 if (sdp->detached) 863 return -ENODEV; 864 __put_user((int) sdp->device->host->host_no, 865 &sg_idp->host_no); 866 __put_user((int) sdp->device->channel, 867 &sg_idp->channel); 868 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 869 __put_user((int) sdp->device->lun, &sg_idp->lun); 870 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 871 __put_user((short) sdp->device->host->cmd_per_lun, 872 &sg_idp->h_cmd_per_lun); 873 __put_user((short) sdp->device->queue_depth, 874 &sg_idp->d_queue_depth); 875 __put_user(0, &sg_idp->unused[0]); 876 __put_user(0, &sg_idp->unused[1]); 877 return 0; 878 } 879 case SG_SET_FORCE_PACK_ID: 880 result = get_user(val, ip); 881 if (result) 882 return result; 883 sfp->force_packid = val ? 1 : 0; 884 return 0; 885 case SG_GET_PACK_ID: 886 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 887 return -EFAULT; 888 read_lock_irqsave(&sfp->rq_list_lock, iflags); 889 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 890 if ((1 == srp->done) && (!srp->sg_io_owned)) { 891 read_unlock_irqrestore(&sfp->rq_list_lock, 892 iflags); 893 __put_user(srp->header.pack_id, ip); 894 return 0; 895 } 896 } 897 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 898 __put_user(-1, ip); 899 return 0; 900 case SG_GET_NUM_WAITING: 901 read_lock_irqsave(&sfp->rq_list_lock, iflags); 902 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 903 if ((1 == srp->done) && (!srp->sg_io_owned)) 904 ++val; 905 } 906 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 907 return put_user(val, ip); 908 case SG_GET_SG_TABLESIZE: 909 return put_user(sdp->sg_tablesize, ip); 910 case SG_SET_RESERVED_SIZE: 911 result = get_user(val, ip); 912 if (result) 913 return result; 914 if (val < 0) 915 return -EINVAL; 916 val = min_t(int, val, 917 sdp->device->request_queue->max_sectors * 512); 918 if (val != sfp->reserve.bufflen) { 919 if (sg_res_in_use(sfp) || sfp->mmap_called) 920 return -EBUSY; 921 sg_remove_scat(&sfp->reserve); 922 sg_build_reserve(sfp, val); 923 } 924 return 0; 925 case SG_GET_RESERVED_SIZE: 926 val = min_t(int, sfp->reserve.bufflen, 927 sdp->device->request_queue->max_sectors * 512); 928 return put_user(val, ip); 929 case SG_SET_COMMAND_Q: 930 result = get_user(val, ip); 931 if (result) 932 return result; 933 sfp->cmd_q = val ? 1 : 0; 934 return 0; 935 case SG_GET_COMMAND_Q: 936 return put_user((int) sfp->cmd_q, ip); 937 case SG_SET_KEEP_ORPHAN: 938 result = get_user(val, ip); 939 if (result) 940 return result; 941 sfp->keep_orphan = val; 942 return 0; 943 case SG_GET_KEEP_ORPHAN: 944 return put_user((int) sfp->keep_orphan, ip); 945 case SG_NEXT_CMD_LEN: 946 result = get_user(val, ip); 947 if (result) 948 return result; 949 sfp->next_cmd_len = (val > 0) ? val : 0; 950 return 0; 951 case SG_GET_VERSION_NUM: 952 return put_user(sg_version_num, ip); 953 case SG_GET_ACCESS_COUNT: 954 /* faked - we don't have a real access count anymore */ 955 val = (sdp->device ? 1 : 0); 956 return put_user(val, ip); 957 case SG_GET_REQUEST_TABLE: 958 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 959 return -EFAULT; 960 else { 961 sg_req_info_t *rinfo; 962 unsigned int ms; 963 964 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 965 GFP_KERNEL); 966 if (!rinfo) 967 return -ENOMEM; 968 read_lock_irqsave(&sfp->rq_list_lock, iflags); 969 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 970 ++val, srp = srp ? srp->nextrp : srp) { 971 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 972 if (srp) { 973 rinfo[val].req_state = srp->done + 1; 974 rinfo[val].problem = 975 srp->header.masked_status & 976 srp->header.host_status & 977 srp->header.driver_status; 978 if (srp->done) 979 rinfo[val].duration = 980 srp->header.duration; 981 else { 982 ms = jiffies_to_msecs(jiffies); 983 rinfo[val].duration = 984 (ms > srp->header.duration) ? 985 (ms - srp->header.duration) : 0; 986 } 987 rinfo[val].orphan = srp->orphan; 988 rinfo[val].sg_io_owned = 989 srp->sg_io_owned; 990 rinfo[val].pack_id = 991 srp->header.pack_id; 992 rinfo[val].usr_ptr = 993 srp->header.usr_ptr; 994 } 995 } 996 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 997 result = __copy_to_user(p, rinfo, 998 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 999 result = result ? -EFAULT : 0; 1000 kfree(rinfo); 1001 return result; 1002 } 1003 case SG_EMULATED_HOST: 1004 if (sdp->detached) 1005 return -ENODEV; 1006 return put_user(sdp->device->host->hostt->emulated, ip); 1007 case SG_SCSI_RESET: 1008 if (sdp->detached) 1009 return -ENODEV; 1010 if (filp->f_flags & O_NONBLOCK) { 1011 if (scsi_host_in_recovery(sdp->device->host)) 1012 return -EBUSY; 1013 } else if (!scsi_block_when_processing_errors(sdp->device)) 1014 return -EBUSY; 1015 result = get_user(val, ip); 1016 if (result) 1017 return result; 1018 if (SG_SCSI_RESET_NOTHING == val) 1019 return 0; 1020 switch (val) { 1021 case SG_SCSI_RESET_DEVICE: 1022 val = SCSI_TRY_RESET_DEVICE; 1023 break; 1024 case SG_SCSI_RESET_BUS: 1025 val = SCSI_TRY_RESET_BUS; 1026 break; 1027 case SG_SCSI_RESET_HOST: 1028 val = SCSI_TRY_RESET_HOST; 1029 break; 1030 default: 1031 return -EINVAL; 1032 } 1033 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1034 return -EACCES; 1035 return (scsi_reset_provider(sdp->device, val) == 1036 SUCCESS) ? 0 : -EIO; 1037 case SCSI_IOCTL_SEND_COMMAND: 1038 if (sdp->detached) 1039 return -ENODEV; 1040 if (read_only) { 1041 unsigned char opcode = WRITE_6; 1042 Scsi_Ioctl_Command __user *siocp = p; 1043 1044 if (copy_from_user(&opcode, siocp->data, 1)) 1045 return -EFAULT; 1046 if (!sg_allow_access(opcode, sdp->device->type)) 1047 return -EPERM; 1048 } 1049 return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p); 1050 case SG_SET_DEBUG: 1051 result = get_user(val, ip); 1052 if (result) 1053 return result; 1054 sdp->sgdebug = (char) val; 1055 return 0; 1056 case SCSI_IOCTL_GET_IDLUN: 1057 case SCSI_IOCTL_GET_BUS_NUMBER: 1058 case SCSI_IOCTL_PROBE_HOST: 1059 case SG_GET_TRANSFORM: 1060 if (sdp->detached) 1061 return -ENODEV; 1062 return scsi_ioctl(sdp->device, cmd_in, p); 1063 case BLKSECTGET: 1064 return put_user(sdp->device->request_queue->max_sectors * 512, 1065 ip); 1066 default: 1067 if (read_only) 1068 return -EPERM; /* don't know so take safe approach */ 1069 return scsi_ioctl(sdp->device, cmd_in, p); 1070 } 1071 } 1072 1073 #ifdef CONFIG_COMPAT 1074 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1075 { 1076 Sg_device *sdp; 1077 Sg_fd *sfp; 1078 struct scsi_device *sdev; 1079 1080 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1081 return -ENXIO; 1082 1083 sdev = sdp->device; 1084 if (sdev->host->hostt->compat_ioctl) { 1085 int ret; 1086 1087 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1088 1089 return ret; 1090 } 1091 1092 return -ENOIOCTLCMD; 1093 } 1094 #endif 1095 1096 static unsigned int 1097 sg_poll(struct file *filp, poll_table * wait) 1098 { 1099 unsigned int res = 0; 1100 Sg_device *sdp; 1101 Sg_fd *sfp; 1102 Sg_request *srp; 1103 int count = 0; 1104 unsigned long iflags; 1105 1106 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) 1107 || sfp->closed) 1108 return POLLERR; 1109 poll_wait(filp, &sfp->read_wait, wait); 1110 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1111 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1112 /* if any read waiting, flag it */ 1113 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1114 res = POLLIN | POLLRDNORM; 1115 ++count; 1116 } 1117 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1118 1119 if (sdp->detached) 1120 res |= POLLHUP; 1121 else if (!sfp->cmd_q) { 1122 if (0 == count) 1123 res |= POLLOUT | POLLWRNORM; 1124 } else if (count < SG_MAX_QUEUE) 1125 res |= POLLOUT | POLLWRNORM; 1126 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1127 sdp->disk->disk_name, (int) res)); 1128 return res; 1129 } 1130 1131 static int 1132 sg_fasync(int fd, struct file *filp, int mode) 1133 { 1134 int retval; 1135 Sg_device *sdp; 1136 Sg_fd *sfp; 1137 1138 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1139 return -ENXIO; 1140 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1141 sdp->disk->disk_name, mode)); 1142 1143 retval = fasync_helper(fd, filp, mode, &sfp->async_qp); 1144 return (retval < 0) ? retval : 0; 1145 } 1146 1147 static struct page * 1148 sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type) 1149 { 1150 Sg_fd *sfp; 1151 struct page *page = NOPAGE_SIGBUS; 1152 unsigned long offset, len, sa; 1153 Sg_scatter_hold *rsv_schp; 1154 struct scatterlist *sg; 1155 int k; 1156 1157 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1158 return page; 1159 rsv_schp = &sfp->reserve; 1160 offset = addr - vma->vm_start; 1161 if (offset >= rsv_schp->bufflen) 1162 return page; 1163 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n", 1164 offset, rsv_schp->k_use_sg)); 1165 sg = rsv_schp->buffer; 1166 sa = vma->vm_start; 1167 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1168 ++k, sg = sg_next(sg)) { 1169 len = vma->vm_end - sa; 1170 len = (len < sg->length) ? len : sg->length; 1171 if (offset < len) { 1172 page = virt_to_page(page_address(sg->page) + offset); 1173 get_page(page); /* increment page count */ 1174 break; 1175 } 1176 sa += len; 1177 offset -= len; 1178 } 1179 1180 if (type) 1181 *type = VM_FAULT_MINOR; 1182 return page; 1183 } 1184 1185 static struct vm_operations_struct sg_mmap_vm_ops = { 1186 .nopage = sg_vma_nopage, 1187 }; 1188 1189 static int 1190 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1191 { 1192 Sg_fd *sfp; 1193 unsigned long req_sz, len, sa; 1194 Sg_scatter_hold *rsv_schp; 1195 int k; 1196 struct scatterlist *sg; 1197 1198 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1199 return -ENXIO; 1200 req_sz = vma->vm_end - vma->vm_start; 1201 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1202 (void *) vma->vm_start, (int) req_sz)); 1203 if (vma->vm_pgoff) 1204 return -EINVAL; /* want no offset */ 1205 rsv_schp = &sfp->reserve; 1206 if (req_sz > rsv_schp->bufflen) 1207 return -ENOMEM; /* cannot map more than reserved buffer */ 1208 1209 sa = vma->vm_start; 1210 sg = rsv_schp->buffer; 1211 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1212 ++k, sg = sg_next(sg)) { 1213 len = vma->vm_end - sa; 1214 len = (len < sg->length) ? len : sg->length; 1215 sa += len; 1216 } 1217 1218 sfp->mmap_called = 1; 1219 vma->vm_flags |= VM_RESERVED; 1220 vma->vm_private_data = sfp; 1221 vma->vm_ops = &sg_mmap_vm_ops; 1222 return 0; 1223 } 1224 1225 /* This function is a "bottom half" handler that is called by the 1226 * mid level when a command is completed (or has failed). */ 1227 static void 1228 sg_cmd_done(void *data, char *sense, int result, int resid) 1229 { 1230 Sg_request *srp = data; 1231 Sg_device *sdp = NULL; 1232 Sg_fd *sfp; 1233 unsigned long iflags; 1234 unsigned int ms; 1235 1236 if (NULL == srp) { 1237 printk(KERN_ERR "sg_cmd_done: NULL request\n"); 1238 return; 1239 } 1240 sfp = srp->parentfp; 1241 if (sfp) 1242 sdp = sfp->parentdp; 1243 if ((NULL == sdp) || sdp->detached) { 1244 printk(KERN_INFO "sg_cmd_done: device detached\n"); 1245 return; 1246 } 1247 1248 1249 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1250 sdp->disk->disk_name, srp->header.pack_id, result)); 1251 srp->header.resid = resid; 1252 ms = jiffies_to_msecs(jiffies); 1253 srp->header.duration = (ms > srp->header.duration) ? 1254 (ms - srp->header.duration) : 0; 1255 if (0 != result) { 1256 struct scsi_sense_hdr sshdr; 1257 1258 memcpy(srp->sense_b, sense, sizeof (srp->sense_b)); 1259 srp->header.status = 0xff & result; 1260 srp->header.masked_status = status_byte(result); 1261 srp->header.msg_status = msg_byte(result); 1262 srp->header.host_status = host_byte(result); 1263 srp->header.driver_status = driver_byte(result); 1264 if ((sdp->sgdebug > 0) && 1265 ((CHECK_CONDITION == srp->header.masked_status) || 1266 (COMMAND_TERMINATED == srp->header.masked_status))) 1267 __scsi_print_sense("sg_cmd_done", sense, 1268 SCSI_SENSE_BUFFERSIZE); 1269 1270 /* Following if statement is a patch supplied by Eric Youngdale */ 1271 if (driver_byte(result) != 0 1272 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1273 && !scsi_sense_is_deferred(&sshdr) 1274 && sshdr.sense_key == UNIT_ATTENTION 1275 && sdp->device->removable) { 1276 /* Detected possible disc change. Set the bit - this */ 1277 /* may be used if there are filesystems using this device */ 1278 sdp->device->changed = 1; 1279 } 1280 } 1281 /* Rely on write phase to clean out srp status values, so no "else" */ 1282 1283 if (sfp->closed) { /* whoops this fd already released, cleanup */ 1284 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); 1285 sg_finish_rem_req(srp); 1286 srp = NULL; 1287 if (NULL == sfp->headrp) { 1288 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n")); 1289 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ 1290 scsi_device_put(sdp->device); 1291 } 1292 sfp = NULL; 1293 } 1294 } else if (srp && srp->orphan) { 1295 if (sfp->keep_orphan) 1296 srp->sg_io_owned = 0; 1297 else { 1298 sg_finish_rem_req(srp); 1299 srp = NULL; 1300 } 1301 } 1302 if (sfp && srp) { 1303 /* Now wake up any sg_read() that is waiting for this packet. */ 1304 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1305 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1306 srp->done = 1; 1307 wake_up_interruptible(&sfp->read_wait); 1308 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1309 } 1310 } 1311 1312 static struct file_operations sg_fops = { 1313 .owner = THIS_MODULE, 1314 .read = sg_read, 1315 .write = sg_write, 1316 .poll = sg_poll, 1317 .ioctl = sg_ioctl, 1318 #ifdef CONFIG_COMPAT 1319 .compat_ioctl = sg_compat_ioctl, 1320 #endif 1321 .open = sg_open, 1322 .mmap = sg_mmap, 1323 .release = sg_release, 1324 .fasync = sg_fasync, 1325 }; 1326 1327 static struct class *sg_sysfs_class; 1328 1329 static int sg_sysfs_valid = 0; 1330 1331 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1332 { 1333 struct request_queue *q = scsidp->request_queue; 1334 Sg_device *sdp; 1335 unsigned long iflags; 1336 int error; 1337 u32 k; 1338 1339 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1340 if (!sdp) { 1341 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1342 return ERR_PTR(-ENOMEM); 1343 } 1344 error = -ENOMEM; 1345 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) { 1346 printk(KERN_WARNING "idr expansion Sg_device failure\n"); 1347 goto out; 1348 } 1349 1350 write_lock_irqsave(&sg_index_lock, iflags); 1351 error = idr_get_new(&sg_index_idr, sdp, &k); 1352 write_unlock_irqrestore(&sg_index_lock, iflags); 1353 1354 if (error) { 1355 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n", 1356 error); 1357 goto out; 1358 } 1359 1360 if (unlikely(k >= SG_MAX_DEVS)) 1361 goto overflow; 1362 1363 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1364 sprintf(disk->disk_name, "sg%d", k); 1365 disk->first_minor = k; 1366 sdp->disk = disk; 1367 sdp->device = scsidp; 1368 init_waitqueue_head(&sdp->o_excl_wait); 1369 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments); 1370 sdp->index = k; 1371 1372 error = 0; 1373 out: 1374 if (error) { 1375 kfree(sdp); 1376 return ERR_PTR(error); 1377 } 1378 return sdp; 1379 1380 overflow: 1381 sdev_printk(KERN_WARNING, scsidp, 1382 "Unable to attach sg device type=%d, minor " 1383 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); 1384 error = -ENODEV; 1385 goto out; 1386 } 1387 1388 static int 1389 sg_add(struct class_device *cl_dev, struct class_interface *cl_intf) 1390 { 1391 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); 1392 struct gendisk *disk; 1393 Sg_device *sdp = NULL; 1394 struct cdev * cdev = NULL; 1395 int error; 1396 unsigned long iflags; 1397 1398 disk = alloc_disk(1); 1399 if (!disk) { 1400 printk(KERN_WARNING "alloc_disk failed\n"); 1401 return -ENOMEM; 1402 } 1403 disk->major = SCSI_GENERIC_MAJOR; 1404 1405 error = -ENOMEM; 1406 cdev = cdev_alloc(); 1407 if (!cdev) { 1408 printk(KERN_WARNING "cdev_alloc failed\n"); 1409 goto out; 1410 } 1411 cdev->owner = THIS_MODULE; 1412 cdev->ops = &sg_fops; 1413 1414 sdp = sg_alloc(disk, scsidp); 1415 if (IS_ERR(sdp)) { 1416 printk(KERN_WARNING "sg_alloc failed\n"); 1417 error = PTR_ERR(sdp); 1418 goto out; 1419 } 1420 1421 class_set_devdata(cl_dev, sdp); 1422 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); 1423 if (error) 1424 goto cdev_add_err; 1425 1426 sdp->cdev = cdev; 1427 if (sg_sysfs_valid) { 1428 struct class_device * sg_class_member; 1429 1430 sg_class_member = class_device_create(sg_sysfs_class, NULL, 1431 MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1432 cl_dev->dev, "%s", 1433 disk->disk_name); 1434 if (IS_ERR(sg_class_member)) 1435 printk(KERN_WARNING "sg_add: " 1436 "class_device_create failed\n"); 1437 class_set_devdata(sg_class_member, sdp); 1438 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1439 &sg_class_member->kobj, "generic"); 1440 if (error) 1441 printk(KERN_ERR "sg_add: unable to make symlink " 1442 "'generic' back to sg%d\n", sdp->index); 1443 } else 1444 printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); 1445 1446 sdev_printk(KERN_NOTICE, scsidp, 1447 "Attached scsi generic sg%d type %d\n", sdp->index, 1448 scsidp->type); 1449 1450 return 0; 1451 1452 cdev_add_err: 1453 write_lock_irqsave(&sg_index_lock, iflags); 1454 idr_remove(&sg_index_idr, sdp->index); 1455 write_unlock_irqrestore(&sg_index_lock, iflags); 1456 kfree(sdp); 1457 1458 out: 1459 put_disk(disk); 1460 if (cdev) 1461 cdev_del(cdev); 1462 return error; 1463 } 1464 1465 static void 1466 sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf) 1467 { 1468 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); 1469 Sg_device *sdp = class_get_devdata(cl_dev); 1470 unsigned long iflags; 1471 Sg_fd *sfp; 1472 Sg_fd *tsfp; 1473 Sg_request *srp; 1474 Sg_request *tsrp; 1475 int delay; 1476 1477 if (!sdp) 1478 return; 1479 1480 delay = 0; 1481 write_lock_irqsave(&sg_index_lock, iflags); 1482 if (sdp->headfp) { 1483 sdp->detached = 1; 1484 for (sfp = sdp->headfp; sfp; sfp = tsfp) { 1485 tsfp = sfp->nextfp; 1486 for (srp = sfp->headrp; srp; srp = tsrp) { 1487 tsrp = srp->nextrp; 1488 if (sfp->closed || (0 == sg_srp_done(srp, sfp))) 1489 sg_finish_rem_req(srp); 1490 } 1491 if (sfp->closed) { 1492 scsi_device_put(sdp->device); 1493 __sg_remove_sfp(sdp, sfp); 1494 } else { 1495 delay = 1; 1496 wake_up_interruptible(&sfp->read_wait); 1497 kill_fasync(&sfp->async_qp, SIGPOLL, 1498 POLL_HUP); 1499 } 1500 } 1501 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index)); 1502 if (NULL == sdp->headfp) { 1503 idr_remove(&sg_index_idr, sdp->index); 1504 } 1505 } else { /* nothing active, simple case */ 1506 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index)); 1507 idr_remove(&sg_index_idr, sdp->index); 1508 } 1509 write_unlock_irqrestore(&sg_index_lock, iflags); 1510 1511 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1512 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); 1513 cdev_del(sdp->cdev); 1514 sdp->cdev = NULL; 1515 put_disk(sdp->disk); 1516 sdp->disk = NULL; 1517 if (NULL == sdp->headfp) 1518 kfree(sdp); 1519 1520 if (delay) 1521 msleep(10); /* dirty detach so delay device destruction */ 1522 } 1523 1524 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1525 module_param_named(def_reserved_size, def_reserved_size, int, 1526 S_IRUGO | S_IWUSR); 1527 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1528 1529 MODULE_AUTHOR("Douglas Gilbert"); 1530 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1531 MODULE_LICENSE("GPL"); 1532 MODULE_VERSION(SG_VERSION_STR); 1533 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1534 1535 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1536 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1537 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1538 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1539 1540 static int __init 1541 init_sg(void) 1542 { 1543 int rc; 1544 1545 if (scatter_elem_sz < PAGE_SIZE) { 1546 scatter_elem_sz = PAGE_SIZE; 1547 scatter_elem_sz_prev = scatter_elem_sz; 1548 } 1549 if (def_reserved_size >= 0) 1550 sg_big_buff = def_reserved_size; 1551 else 1552 def_reserved_size = sg_big_buff; 1553 1554 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1555 SG_MAX_DEVS, "sg"); 1556 if (rc) 1557 return rc; 1558 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1559 if ( IS_ERR(sg_sysfs_class) ) { 1560 rc = PTR_ERR(sg_sysfs_class); 1561 goto err_out; 1562 } 1563 sg_sysfs_valid = 1; 1564 rc = scsi_register_interface(&sg_interface); 1565 if (0 == rc) { 1566 #ifdef CONFIG_SCSI_PROC_FS 1567 sg_proc_init(); 1568 #endif /* CONFIG_SCSI_PROC_FS */ 1569 return 0; 1570 } 1571 class_destroy(sg_sysfs_class); 1572 err_out: 1573 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1574 return rc; 1575 } 1576 1577 static void __exit 1578 exit_sg(void) 1579 { 1580 #ifdef CONFIG_SCSI_PROC_FS 1581 sg_proc_cleanup(); 1582 #endif /* CONFIG_SCSI_PROC_FS */ 1583 scsi_unregister_interface(&sg_interface); 1584 class_destroy(sg_sysfs_class); 1585 sg_sysfs_valid = 0; 1586 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1587 SG_MAX_DEVS); 1588 idr_destroy(&sg_index_idr); 1589 } 1590 1591 static int 1592 sg_start_req(Sg_request * srp) 1593 { 1594 int res; 1595 Sg_fd *sfp = srp->parentfp; 1596 sg_io_hdr_t *hp = &srp->header; 1597 int dxfer_len = (int) hp->dxfer_len; 1598 int dxfer_dir = hp->dxfer_direction; 1599 Sg_scatter_hold *req_schp = &srp->data; 1600 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1601 1602 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); 1603 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1604 return 0; 1605 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && 1606 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && 1607 (!sfp->parentdp->device->host->unchecked_isa_dma)) { 1608 res = sg_build_direct(srp, sfp, dxfer_len); 1609 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ 1610 return res; 1611 } 1612 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) 1613 sg_link_reserve(sfp, srp, dxfer_len); 1614 else { 1615 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1616 if (res) { 1617 sg_remove_scat(req_schp); 1618 return res; 1619 } 1620 } 1621 return 0; 1622 } 1623 1624 static void 1625 sg_finish_rem_req(Sg_request * srp) 1626 { 1627 Sg_fd *sfp = srp->parentfp; 1628 Sg_scatter_hold *req_schp = &srp->data; 1629 1630 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1631 if (srp->res_used) 1632 sg_unlink_reserve(sfp, srp); 1633 else 1634 sg_remove_scat(req_schp); 1635 sg_remove_request(sfp, srp); 1636 } 1637 1638 static int 1639 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1640 { 1641 int sg_bufflen = tablesize * sizeof(struct scatterlist); 1642 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1643 1644 /* 1645 * TODO: test without low_dma, we should not need it since 1646 * the block layer will bounce the buffer for us 1647 * 1648 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list. 1649 */ 1650 if (sfp->low_dma) 1651 gfp_flags |= GFP_DMA; 1652 schp->buffer = kzalloc(sg_bufflen, gfp_flags); 1653 if (!schp->buffer) 1654 return -ENOMEM; 1655 schp->sglist_len = sg_bufflen; 1656 return tablesize; /* number of scat_gath elements allocated */ 1657 } 1658 1659 #ifdef SG_ALLOW_DIO_CODE 1660 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ 1661 /* TODO: hopefully we can use the generic block layer code */ 1662 1663 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if 1664 - mapping of all pages not successful 1665 (i.e., either completely successful or fails) 1666 */ 1667 static int 1668 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, 1669 unsigned long uaddr, size_t count, int rw) 1670 { 1671 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 1672 unsigned long start = uaddr >> PAGE_SHIFT; 1673 const int nr_pages = end - start; 1674 int res, i, j; 1675 struct page **pages; 1676 1677 /* User attempted Overflow! */ 1678 if ((uaddr + count) < uaddr) 1679 return -EINVAL; 1680 1681 /* Too big */ 1682 if (nr_pages > max_pages) 1683 return -ENOMEM; 1684 1685 /* Hmm? */ 1686 if (count == 0) 1687 return 0; 1688 1689 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) 1690 return -ENOMEM; 1691 1692 /* Try to fault in all of the necessary pages */ 1693 down_read(¤t->mm->mmap_sem); 1694 /* rw==READ means read from drive, write into memory area */ 1695 res = get_user_pages( 1696 current, 1697 current->mm, 1698 uaddr, 1699 nr_pages, 1700 rw == READ, 1701 0, /* don't force */ 1702 pages, 1703 NULL); 1704 up_read(¤t->mm->mmap_sem); 1705 1706 /* Errors and no page mapped should return here */ 1707 if (res < nr_pages) 1708 goto out_unmap; 1709 1710 for (i=0; i < nr_pages; i++) { 1711 /* FIXME: flush superflous for rw==READ, 1712 * probably wrong function for rw==WRITE 1713 */ 1714 flush_dcache_page(pages[i]); 1715 /* ?? Is locking needed? I don't think so */ 1716 /* if (TestSetPageLocked(pages[i])) 1717 goto out_unlock; */ 1718 } 1719 1720 sgl[0].page = pages[0]; 1721 sgl[0].offset = uaddr & ~PAGE_MASK; 1722 if (nr_pages > 1) { 1723 sgl[0].length = PAGE_SIZE - sgl[0].offset; 1724 count -= sgl[0].length; 1725 for (i=1; i < nr_pages ; i++) { 1726 sgl[i].page = pages[i]; 1727 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; 1728 count -= PAGE_SIZE; 1729 } 1730 } 1731 else { 1732 sgl[0].length = count; 1733 } 1734 1735 kfree(pages); 1736 return nr_pages; 1737 1738 out_unmap: 1739 if (res > 0) { 1740 for (j=0; j < res; j++) 1741 page_cache_release(pages[j]); 1742 res = 0; 1743 } 1744 kfree(pages); 1745 return res; 1746 } 1747 1748 1749 /* And unmap them... */ 1750 static int 1751 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, 1752 int dirtied) 1753 { 1754 int i; 1755 1756 for (i=0; i < nr_pages; i++) { 1757 struct page *page = sgl[i].page; 1758 1759 if (dirtied) 1760 SetPageDirty(page); 1761 /* unlock_page(page); */ 1762 /* FIXME: cache flush missing for rw==READ 1763 * FIXME: call the correct reference counting function 1764 */ 1765 page_cache_release(page); 1766 } 1767 1768 return 0; 1769 } 1770 1771 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ 1772 #endif 1773 1774 1775 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ 1776 static int 1777 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) 1778 { 1779 #ifdef SG_ALLOW_DIO_CODE 1780 sg_io_hdr_t *hp = &srp->header; 1781 Sg_scatter_hold *schp = &srp->data; 1782 int sg_tablesize = sfp->parentdp->sg_tablesize; 1783 int mx_sc_elems, res; 1784 struct scsi_device *sdev = sfp->parentdp->device; 1785 1786 if (((unsigned long)hp->dxferp & 1787 queue_dma_alignment(sdev->request_queue)) != 0) 1788 return 1; 1789 1790 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1791 if (mx_sc_elems <= 0) { 1792 return 1; 1793 } 1794 res = st_map_user_pages(schp->buffer, mx_sc_elems, 1795 (unsigned long)hp->dxferp, dxfer_len, 1796 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0); 1797 if (res <= 0) { 1798 sg_remove_scat(schp); 1799 return 1; 1800 } 1801 schp->k_use_sg = res; 1802 schp->dio_in_use = 1; 1803 hp->info |= SG_INFO_DIRECT_IO; 1804 return 0; 1805 #else 1806 return 1; 1807 #endif 1808 } 1809 1810 static int 1811 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1812 { 1813 struct scatterlist *sg; 1814 int ret_sz = 0, k, rem_sz, num, mx_sc_elems; 1815 int sg_tablesize = sfp->parentdp->sg_tablesize; 1816 int blk_size = buff_size; 1817 struct page *p = NULL; 1818 1819 if (blk_size < 0) 1820 return -EFAULT; 1821 if (0 == blk_size) 1822 ++blk_size; /* don't know why */ 1823 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1824 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); 1825 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1826 buff_size, blk_size)); 1827 1828 /* N.B. ret_sz carried into this block ... */ 1829 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1830 if (mx_sc_elems < 0) 1831 return mx_sc_elems; /* most likely -ENOMEM */ 1832 1833 num = scatter_elem_sz; 1834 if (unlikely(num != scatter_elem_sz_prev)) { 1835 if (num < PAGE_SIZE) { 1836 scatter_elem_sz = PAGE_SIZE; 1837 scatter_elem_sz_prev = PAGE_SIZE; 1838 } else 1839 scatter_elem_sz_prev = num; 1840 } 1841 for (k = 0, sg = schp->buffer, rem_sz = blk_size; 1842 (rem_sz > 0) && (k < mx_sc_elems); 1843 ++k, rem_sz -= ret_sz, sg = sg_next(sg)) { 1844 1845 num = (rem_sz > scatter_elem_sz_prev) ? 1846 scatter_elem_sz_prev : rem_sz; 1847 p = sg_page_malloc(num, sfp->low_dma, &ret_sz); 1848 if (!p) 1849 return -ENOMEM; 1850 1851 if (num == scatter_elem_sz_prev) { 1852 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1853 scatter_elem_sz = ret_sz; 1854 scatter_elem_sz_prev = ret_sz; 1855 } 1856 } 1857 sg->page = p; 1858 sg->length = (ret_sz > num) ? num : ret_sz; 1859 1860 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " 1861 "ret_sz=%d\n", k, num, ret_sz)); 1862 } /* end of for loop */ 1863 1864 schp->k_use_sg = k; 1865 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " 1866 "rem_sz=%d\n", k, rem_sz)); 1867 1868 schp->bufflen = blk_size; 1869 if (rem_sz > 0) /* must have failed */ 1870 return -ENOMEM; 1871 1872 return 0; 1873 } 1874 1875 static int 1876 sg_write_xfer(Sg_request * srp) 1877 { 1878 sg_io_hdr_t *hp = &srp->header; 1879 Sg_scatter_hold *schp = &srp->data; 1880 struct scatterlist *sg = schp->buffer; 1881 int num_xfer = 0; 1882 int j, k, onum, usglen, ksglen, res; 1883 int iovec_count = (int) hp->iovec_count; 1884 int dxfer_dir = hp->dxfer_direction; 1885 unsigned char *p; 1886 unsigned char __user *up; 1887 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 1888 1889 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || 1890 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 1891 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); 1892 if (schp->bufflen < num_xfer) 1893 num_xfer = schp->bufflen; 1894 } 1895 if ((num_xfer <= 0) || (schp->dio_in_use) || 1896 (new_interface 1897 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 1898 return 0; 1899 1900 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 1901 num_xfer, iovec_count, schp->k_use_sg)); 1902 if (iovec_count) { 1903 onum = iovec_count; 1904 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 1905 return -EFAULT; 1906 } else 1907 onum = 1; 1908 1909 ksglen = sg->length; 1910 p = page_address(sg->page); 1911 for (j = 0, k = 0; j < onum; ++j) { 1912 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); 1913 if (res) 1914 return res; 1915 1916 for (; p; sg = sg_next(sg), ksglen = sg->length, 1917 p = page_address(sg->page)) { 1918 if (usglen <= 0) 1919 break; 1920 if (ksglen > usglen) { 1921 if (usglen >= num_xfer) { 1922 if (__copy_from_user(p, up, num_xfer)) 1923 return -EFAULT; 1924 return 0; 1925 } 1926 if (__copy_from_user(p, up, usglen)) 1927 return -EFAULT; 1928 p += usglen; 1929 ksglen -= usglen; 1930 break; 1931 } else { 1932 if (ksglen >= num_xfer) { 1933 if (__copy_from_user(p, up, num_xfer)) 1934 return -EFAULT; 1935 return 0; 1936 } 1937 if (__copy_from_user(p, up, ksglen)) 1938 return -EFAULT; 1939 up += ksglen; 1940 usglen -= ksglen; 1941 } 1942 ++k; 1943 if (k >= schp->k_use_sg) 1944 return 0; 1945 } 1946 } 1947 1948 return 0; 1949 } 1950 1951 static int 1952 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 1953 int wr_xf, int *countp, unsigned char __user **up) 1954 { 1955 int num_xfer = (int) hp->dxfer_len; 1956 unsigned char __user *p = hp->dxferp; 1957 int count; 1958 1959 if (0 == sg_num) { 1960 if (wr_xf && ('\0' == hp->interface_id)) 1961 count = (int) hp->flags; /* holds "old" input_size */ 1962 else 1963 count = num_xfer; 1964 } else { 1965 sg_iovec_t iovec; 1966 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) 1967 return -EFAULT; 1968 p = iovec.iov_base; 1969 count = (int) iovec.iov_len; 1970 } 1971 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) 1972 return -EFAULT; 1973 if (up) 1974 *up = p; 1975 if (countp) 1976 *countp = count; 1977 return 0; 1978 } 1979 1980 static void 1981 sg_remove_scat(Sg_scatter_hold * schp) 1982 { 1983 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1984 if (schp->buffer && (schp->sglist_len > 0)) { 1985 struct scatterlist *sg = schp->buffer; 1986 1987 if (schp->dio_in_use) { 1988 #ifdef SG_ALLOW_DIO_CODE 1989 st_unmap_user_pages(sg, schp->k_use_sg, TRUE); 1990 #endif 1991 } else { 1992 int k; 1993 1994 for (k = 0; (k < schp->k_use_sg) && sg->page; 1995 ++k, sg = sg_next(sg)) { 1996 SCSI_LOG_TIMEOUT(5, printk( 1997 "sg_remove_scat: k=%d, pg=0x%p, len=%d\n", 1998 k, sg->page, sg->length)); 1999 sg_page_free(sg->page, sg->length); 2000 } 2001 } 2002 kfree(schp->buffer); 2003 } 2004 memset(schp, 0, sizeof (*schp)); 2005 } 2006 2007 static int 2008 sg_read_xfer(Sg_request * srp) 2009 { 2010 sg_io_hdr_t *hp = &srp->header; 2011 Sg_scatter_hold *schp = &srp->data; 2012 struct scatterlist *sg = schp->buffer; 2013 int num_xfer = 0; 2014 int j, k, onum, usglen, ksglen, res; 2015 int iovec_count = (int) hp->iovec_count; 2016 int dxfer_dir = hp->dxfer_direction; 2017 unsigned char *p; 2018 unsigned char __user *up; 2019 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 2020 2021 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) 2022 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 2023 num_xfer = hp->dxfer_len; 2024 if (schp->bufflen < num_xfer) 2025 num_xfer = schp->bufflen; 2026 } 2027 if ((num_xfer <= 0) || (schp->dio_in_use) || 2028 (new_interface 2029 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 2030 return 0; 2031 2032 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 2033 num_xfer, iovec_count, schp->k_use_sg)); 2034 if (iovec_count) { 2035 onum = iovec_count; 2036 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 2037 return -EFAULT; 2038 } else 2039 onum = 1; 2040 2041 p = page_address(sg->page); 2042 ksglen = sg->length; 2043 for (j = 0, k = 0; j < onum; ++j) { 2044 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); 2045 if (res) 2046 return res; 2047 2048 for (; p; sg = sg_next(sg), ksglen = sg->length, 2049 p = page_address(sg->page)) { 2050 if (usglen <= 0) 2051 break; 2052 if (ksglen > usglen) { 2053 if (usglen >= num_xfer) { 2054 if (__copy_to_user(up, p, num_xfer)) 2055 return -EFAULT; 2056 return 0; 2057 } 2058 if (__copy_to_user(up, p, usglen)) 2059 return -EFAULT; 2060 p += usglen; 2061 ksglen -= usglen; 2062 break; 2063 } else { 2064 if (ksglen >= num_xfer) { 2065 if (__copy_to_user(up, p, num_xfer)) 2066 return -EFAULT; 2067 return 0; 2068 } 2069 if (__copy_to_user(up, p, ksglen)) 2070 return -EFAULT; 2071 up += ksglen; 2072 usglen -= ksglen; 2073 } 2074 ++k; 2075 if (k >= schp->k_use_sg) 2076 return 0; 2077 } 2078 } 2079 2080 return 0; 2081 } 2082 2083 static int 2084 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 2085 { 2086 Sg_scatter_hold *schp = &srp->data; 2087 struct scatterlist *sg = schp->buffer; 2088 int k, num; 2089 2090 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 2091 num_read_xfer)); 2092 if ((!outp) || (num_read_xfer <= 0)) 2093 return 0; 2094 2095 for (k = 0; (k < schp->k_use_sg) && sg->page; ++k, sg = sg_next(sg)) { 2096 num = sg->length; 2097 if (num > num_read_xfer) { 2098 if (__copy_to_user(outp, page_address(sg->page), 2099 num_read_xfer)) 2100 return -EFAULT; 2101 break; 2102 } else { 2103 if (__copy_to_user(outp, page_address(sg->page), 2104 num)) 2105 return -EFAULT; 2106 num_read_xfer -= num; 2107 if (num_read_xfer <= 0) 2108 break; 2109 outp += num; 2110 } 2111 } 2112 2113 return 0; 2114 } 2115 2116 static void 2117 sg_build_reserve(Sg_fd * sfp, int req_size) 2118 { 2119 Sg_scatter_hold *schp = &sfp->reserve; 2120 2121 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 2122 do { 2123 if (req_size < PAGE_SIZE) 2124 req_size = PAGE_SIZE; 2125 if (0 == sg_build_indirect(schp, sfp, req_size)) 2126 return; 2127 else 2128 sg_remove_scat(schp); 2129 req_size >>= 1; /* divide by 2 */ 2130 } while (req_size > (PAGE_SIZE / 2)); 2131 } 2132 2133 static void 2134 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 2135 { 2136 Sg_scatter_hold *req_schp = &srp->data; 2137 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2138 struct scatterlist *sg = rsv_schp->buffer; 2139 int k, num, rem; 2140 2141 srp->res_used = 1; 2142 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 2143 rem = size; 2144 2145 for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) { 2146 num = sg->length; 2147 if (rem <= num) { 2148 sfp->save_scat_len = num; 2149 sg->length = rem; 2150 req_schp->k_use_sg = k + 1; 2151 req_schp->sglist_len = rsv_schp->sglist_len; 2152 req_schp->buffer = rsv_schp->buffer; 2153 2154 req_schp->bufflen = size; 2155 req_schp->b_malloc_len = rsv_schp->b_malloc_len; 2156 break; 2157 } else 2158 rem -= num; 2159 } 2160 2161 if (k >= rsv_schp->k_use_sg) 2162 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 2163 } 2164 2165 static void 2166 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 2167 { 2168 Sg_scatter_hold *req_schp = &srp->data; 2169 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2170 2171 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 2172 (int) req_schp->k_use_sg)); 2173 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { 2174 struct scatterlist *sg = rsv_schp->buffer; 2175 2176 if (sfp->save_scat_len > 0) 2177 (sg + (req_schp->k_use_sg - 1))->length = 2178 (unsigned) sfp->save_scat_len; 2179 else 2180 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); 2181 } 2182 req_schp->k_use_sg = 0; 2183 req_schp->bufflen = 0; 2184 req_schp->buffer = NULL; 2185 req_schp->sglist_len = 0; 2186 sfp->save_scat_len = 0; 2187 srp->res_used = 0; 2188 } 2189 2190 static Sg_request * 2191 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 2192 { 2193 Sg_request *resp; 2194 unsigned long iflags; 2195 2196 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2197 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 2198 /* look for requests that are ready + not SG_IO owned */ 2199 if ((1 == resp->done) && (!resp->sg_io_owned) && 2200 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 2201 resp->done = 2; /* guard against other readers */ 2202 break; 2203 } 2204 } 2205 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2206 return resp; 2207 } 2208 2209 #ifdef CONFIG_SCSI_PROC_FS 2210 static Sg_request * 2211 sg_get_nth_request(Sg_fd * sfp, int nth) 2212 { 2213 Sg_request *resp; 2214 unsigned long iflags; 2215 int k; 2216 2217 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2218 for (k = 0, resp = sfp->headrp; resp && (k < nth); 2219 ++k, resp = resp->nextrp) ; 2220 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2221 return resp; 2222 } 2223 #endif 2224 2225 /* always adds to end of list */ 2226 static Sg_request * 2227 sg_add_request(Sg_fd * sfp) 2228 { 2229 int k; 2230 unsigned long iflags; 2231 Sg_request *resp; 2232 Sg_request *rp = sfp->req_arr; 2233 2234 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2235 resp = sfp->headrp; 2236 if (!resp) { 2237 memset(rp, 0, sizeof (Sg_request)); 2238 rp->parentfp = sfp; 2239 resp = rp; 2240 sfp->headrp = resp; 2241 } else { 2242 if (0 == sfp->cmd_q) 2243 resp = NULL; /* command queuing disallowed */ 2244 else { 2245 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2246 if (!rp->parentfp) 2247 break; 2248 } 2249 if (k < SG_MAX_QUEUE) { 2250 memset(rp, 0, sizeof (Sg_request)); 2251 rp->parentfp = sfp; 2252 while (resp->nextrp) 2253 resp = resp->nextrp; 2254 resp->nextrp = rp; 2255 resp = rp; 2256 } else 2257 resp = NULL; 2258 } 2259 } 2260 if (resp) { 2261 resp->nextrp = NULL; 2262 resp->header.duration = jiffies_to_msecs(jiffies); 2263 } 2264 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2265 return resp; 2266 } 2267 2268 /* Return of 1 for found; 0 for not found */ 2269 static int 2270 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2271 { 2272 Sg_request *prev_rp; 2273 Sg_request *rp; 2274 unsigned long iflags; 2275 int res = 0; 2276 2277 if ((!sfp) || (!srp) || (!sfp->headrp)) 2278 return res; 2279 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2280 prev_rp = sfp->headrp; 2281 if (srp == prev_rp) { 2282 sfp->headrp = prev_rp->nextrp; 2283 prev_rp->parentfp = NULL; 2284 res = 1; 2285 } else { 2286 while ((rp = prev_rp->nextrp)) { 2287 if (srp == rp) { 2288 prev_rp->nextrp = rp->nextrp; 2289 rp->parentfp = NULL; 2290 res = 1; 2291 break; 2292 } 2293 prev_rp = rp; 2294 } 2295 } 2296 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2297 return res; 2298 } 2299 2300 #ifdef CONFIG_SCSI_PROC_FS 2301 static Sg_fd * 2302 sg_get_nth_sfp(Sg_device * sdp, int nth) 2303 { 2304 Sg_fd *resp; 2305 unsigned long iflags; 2306 int k; 2307 2308 read_lock_irqsave(&sg_index_lock, iflags); 2309 for (k = 0, resp = sdp->headfp; resp && (k < nth); 2310 ++k, resp = resp->nextfp) ; 2311 read_unlock_irqrestore(&sg_index_lock, iflags); 2312 return resp; 2313 } 2314 #endif 2315 2316 static Sg_fd * 2317 sg_add_sfp(Sg_device * sdp, int dev) 2318 { 2319 Sg_fd *sfp; 2320 unsigned long iflags; 2321 int bufflen; 2322 2323 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2324 if (!sfp) 2325 return NULL; 2326 2327 init_waitqueue_head(&sfp->read_wait); 2328 rwlock_init(&sfp->rq_list_lock); 2329 2330 sfp->timeout = SG_DEFAULT_TIMEOUT; 2331 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2332 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2333 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2334 sdp->device->host->unchecked_isa_dma : 1; 2335 sfp->cmd_q = SG_DEF_COMMAND_Q; 2336 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2337 sfp->parentdp = sdp; 2338 write_lock_irqsave(&sg_index_lock, iflags); 2339 if (!sdp->headfp) 2340 sdp->headfp = sfp; 2341 else { /* add to tail of existing list */ 2342 Sg_fd *pfp = sdp->headfp; 2343 while (pfp->nextfp) 2344 pfp = pfp->nextfp; 2345 pfp->nextfp = sfp; 2346 } 2347 write_unlock_irqrestore(&sg_index_lock, iflags); 2348 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2349 if (unlikely(sg_big_buff != def_reserved_size)) 2350 sg_big_buff = def_reserved_size; 2351 2352 bufflen = min_t(int, sg_big_buff, 2353 sdp->device->request_queue->max_sectors * 512); 2354 sg_build_reserve(sfp, bufflen); 2355 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2356 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2357 return sfp; 2358 } 2359 2360 static void 2361 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2362 { 2363 Sg_fd *fp; 2364 Sg_fd *prev_fp; 2365 2366 prev_fp = sdp->headfp; 2367 if (sfp == prev_fp) 2368 sdp->headfp = prev_fp->nextfp; 2369 else { 2370 while ((fp = prev_fp->nextfp)) { 2371 if (sfp == fp) { 2372 prev_fp->nextfp = fp->nextfp; 2373 break; 2374 } 2375 prev_fp = fp; 2376 } 2377 } 2378 if (sfp->reserve.bufflen > 0) { 2379 SCSI_LOG_TIMEOUT(6, 2380 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2381 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); 2382 sg_remove_scat(&sfp->reserve); 2383 } 2384 sfp->parentdp = NULL; 2385 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); 2386 kfree(sfp); 2387 } 2388 2389 /* Returns 0 in normal case, 1 when detached and sdp object removed */ 2390 static int 2391 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2392 { 2393 Sg_request *srp; 2394 Sg_request *tsrp; 2395 int dirty = 0; 2396 int res = 0; 2397 2398 for (srp = sfp->headrp; srp; srp = tsrp) { 2399 tsrp = srp->nextrp; 2400 if (sg_srp_done(srp, sfp)) 2401 sg_finish_rem_req(srp); 2402 else 2403 ++dirty; 2404 } 2405 if (0 == dirty) { 2406 unsigned long iflags; 2407 2408 write_lock_irqsave(&sg_index_lock, iflags); 2409 __sg_remove_sfp(sdp, sfp); 2410 if (sdp->detached && (NULL == sdp->headfp)) { 2411 idr_remove(&sg_index_idr, sdp->index); 2412 kfree(sdp); 2413 res = 1; 2414 } 2415 write_unlock_irqrestore(&sg_index_lock, iflags); 2416 } else { 2417 /* MOD_INC's to inhibit unloading sg and associated adapter driver */ 2418 /* only bump the access_count if we actually succeeded in 2419 * throwing another counter on the host module */ 2420 scsi_device_get(sdp->device); /* XXX: retval ignored? */ 2421 sfp->closed = 1; /* flag dirty state on this fd */ 2422 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", 2423 dirty)); 2424 } 2425 return res; 2426 } 2427 2428 static int 2429 sg_res_in_use(Sg_fd * sfp) 2430 { 2431 const Sg_request *srp; 2432 unsigned long iflags; 2433 2434 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2435 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2436 if (srp->res_used) 2437 break; 2438 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2439 return srp ? 1 : 0; 2440 } 2441 2442 /* The size fetched (value output via retSzp) set when non-NULL return */ 2443 static struct page * 2444 sg_page_malloc(int rqSz, int lowDma, int *retSzp) 2445 { 2446 struct page *resp = NULL; 2447 gfp_t page_mask; 2448 int order, a_size; 2449 int resSz; 2450 2451 if ((rqSz <= 0) || (NULL == retSzp)) 2452 return resp; 2453 2454 if (lowDma) 2455 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN; 2456 else 2457 page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 2458 2459 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; 2460 order++, a_size <<= 1) ; 2461 resSz = a_size; /* rounded up if necessary */ 2462 resp = alloc_pages(page_mask, order); 2463 while ((!resp) && order) { 2464 --order; 2465 a_size >>= 1; /* divide by 2, until PAGE_SIZE */ 2466 resp = alloc_pages(page_mask, order); /* try half */ 2467 resSz = a_size; 2468 } 2469 if (resp) { 2470 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2471 memset(page_address(resp), 0, resSz); 2472 *retSzp = resSz; 2473 } 2474 return resp; 2475 } 2476 2477 static void 2478 sg_page_free(struct page *page, int size) 2479 { 2480 int order, a_size; 2481 2482 if (!page) 2483 return; 2484 for (order = 0, a_size = PAGE_SIZE; a_size < size; 2485 order++, a_size <<= 1) ; 2486 __free_pages(page, order); 2487 } 2488 2489 #ifndef MAINTENANCE_IN_CMD 2490 #define MAINTENANCE_IN_CMD 0xa3 2491 #endif 2492 2493 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, 2494 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, 2495 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, 2496 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD 2497 }; 2498 2499 static int 2500 sg_allow_access(unsigned char opcode, char dev_type) 2501 { 2502 int k; 2503 2504 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */ 2505 return 1; 2506 for (k = 0; k < sizeof (allow_ops); ++k) { 2507 if (opcode == allow_ops[k]) 2508 return 1; 2509 } 2510 return 0; 2511 } 2512 2513 #ifdef CONFIG_SCSI_PROC_FS 2514 static int 2515 sg_idr_max_id(int id, void *p, void *data) 2516 { 2517 int *k = data; 2518 2519 if (*k < id) 2520 *k = id; 2521 2522 return 0; 2523 } 2524 2525 static int 2526 sg_last_dev(void) 2527 { 2528 int k = 0; 2529 unsigned long iflags; 2530 2531 read_lock_irqsave(&sg_index_lock, iflags); 2532 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2533 read_unlock_irqrestore(&sg_index_lock, iflags); 2534 return k + 1; /* origin 1 */ 2535 } 2536 #endif 2537 2538 static Sg_device * 2539 sg_get_dev(int dev) 2540 { 2541 Sg_device *sdp; 2542 unsigned long iflags; 2543 2544 read_lock_irqsave(&sg_index_lock, iflags); 2545 sdp = idr_find(&sg_index_idr, dev); 2546 read_unlock_irqrestore(&sg_index_lock, iflags); 2547 2548 return sdp; 2549 } 2550 2551 #ifdef CONFIG_SCSI_PROC_FS 2552 2553 static struct proc_dir_entry *sg_proc_sgp = NULL; 2554 2555 static char sg_proc_sg_dirname[] = "scsi/sg"; 2556 2557 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2558 2559 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2560 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2561 size_t count, loff_t *off); 2562 static struct file_operations adio_fops = { 2563 /* .owner, .read and .llseek added in sg_proc_init() */ 2564 .open = sg_proc_single_open_adio, 2565 .write = sg_proc_write_adio, 2566 .release = single_release, 2567 }; 2568 2569 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2570 static ssize_t sg_proc_write_dressz(struct file *filp, 2571 const char __user *buffer, size_t count, loff_t *off); 2572 static struct file_operations dressz_fops = { 2573 .open = sg_proc_single_open_dressz, 2574 .write = sg_proc_write_dressz, 2575 .release = single_release, 2576 }; 2577 2578 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2579 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2580 static struct file_operations version_fops = { 2581 .open = sg_proc_single_open_version, 2582 .release = single_release, 2583 }; 2584 2585 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2586 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2587 static struct file_operations devhdr_fops = { 2588 .open = sg_proc_single_open_devhdr, 2589 .release = single_release, 2590 }; 2591 2592 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2593 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2594 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2595 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2596 static void dev_seq_stop(struct seq_file *s, void *v); 2597 static struct file_operations dev_fops = { 2598 .open = sg_proc_open_dev, 2599 .release = seq_release, 2600 }; 2601 static struct seq_operations dev_seq_ops = { 2602 .start = dev_seq_start, 2603 .next = dev_seq_next, 2604 .stop = dev_seq_stop, 2605 .show = sg_proc_seq_show_dev, 2606 }; 2607 2608 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2609 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2610 static struct file_operations devstrs_fops = { 2611 .open = sg_proc_open_devstrs, 2612 .release = seq_release, 2613 }; 2614 static struct seq_operations devstrs_seq_ops = { 2615 .start = dev_seq_start, 2616 .next = dev_seq_next, 2617 .stop = dev_seq_stop, 2618 .show = sg_proc_seq_show_devstrs, 2619 }; 2620 2621 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2622 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2623 static struct file_operations debug_fops = { 2624 .open = sg_proc_open_debug, 2625 .release = seq_release, 2626 }; 2627 static struct seq_operations debug_seq_ops = { 2628 .start = dev_seq_start, 2629 .next = dev_seq_next, 2630 .stop = dev_seq_stop, 2631 .show = sg_proc_seq_show_debug, 2632 }; 2633 2634 2635 struct sg_proc_leaf { 2636 const char * name; 2637 struct file_operations * fops; 2638 }; 2639 2640 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2641 {"allow_dio", &adio_fops}, 2642 {"debug", &debug_fops}, 2643 {"def_reserved_size", &dressz_fops}, 2644 {"device_hdr", &devhdr_fops}, 2645 {"devices", &dev_fops}, 2646 {"device_strs", &devstrs_fops}, 2647 {"version", &version_fops} 2648 }; 2649 2650 static int 2651 sg_proc_init(void) 2652 { 2653 int k, mask; 2654 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2655 struct proc_dir_entry *pdep; 2656 struct sg_proc_leaf * leaf; 2657 2658 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2659 if (!sg_proc_sgp) 2660 return 1; 2661 for (k = 0; k < num_leaves; ++k) { 2662 leaf = &sg_proc_leaf_arr[k]; 2663 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2664 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp); 2665 if (pdep) { 2666 leaf->fops->owner = THIS_MODULE, 2667 leaf->fops->read = seq_read, 2668 leaf->fops->llseek = seq_lseek, 2669 pdep->proc_fops = leaf->fops; 2670 } 2671 } 2672 return 0; 2673 } 2674 2675 static void 2676 sg_proc_cleanup(void) 2677 { 2678 int k; 2679 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2680 2681 if (!sg_proc_sgp) 2682 return; 2683 for (k = 0; k < num_leaves; ++k) 2684 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2685 remove_proc_entry(sg_proc_sg_dirname, NULL); 2686 } 2687 2688 2689 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2690 { 2691 seq_printf(s, "%d\n", *((int *)s->private)); 2692 return 0; 2693 } 2694 2695 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2696 { 2697 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2698 } 2699 2700 static ssize_t 2701 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2702 size_t count, loff_t *off) 2703 { 2704 int num; 2705 char buff[11]; 2706 2707 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2708 return -EACCES; 2709 num = (count < 10) ? count : 10; 2710 if (copy_from_user(buff, buffer, num)) 2711 return -EFAULT; 2712 buff[num] = '\0'; 2713 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2714 return count; 2715 } 2716 2717 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2718 { 2719 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2720 } 2721 2722 static ssize_t 2723 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2724 size_t count, loff_t *off) 2725 { 2726 int num; 2727 unsigned long k = ULONG_MAX; 2728 char buff[11]; 2729 2730 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2731 return -EACCES; 2732 num = (count < 10) ? count : 10; 2733 if (copy_from_user(buff, buffer, num)) 2734 return -EFAULT; 2735 buff[num] = '\0'; 2736 k = simple_strtoul(buff, NULL, 10); 2737 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2738 sg_big_buff = k; 2739 return count; 2740 } 2741 return -ERANGE; 2742 } 2743 2744 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2745 { 2746 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2747 sg_version_date); 2748 return 0; 2749 } 2750 2751 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2752 { 2753 return single_open(file, sg_proc_seq_show_version, NULL); 2754 } 2755 2756 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2757 { 2758 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2759 "online\n"); 2760 return 0; 2761 } 2762 2763 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2764 { 2765 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2766 } 2767 2768 struct sg_proc_deviter { 2769 loff_t index; 2770 size_t max; 2771 }; 2772 2773 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2774 { 2775 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2776 2777 s->private = it; 2778 if (! it) 2779 return NULL; 2780 2781 it->index = *pos; 2782 it->max = sg_last_dev(); 2783 if (it->index >= it->max) 2784 return NULL; 2785 return it; 2786 } 2787 2788 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2789 { 2790 struct sg_proc_deviter * it = s->private; 2791 2792 *pos = ++it->index; 2793 return (it->index < it->max) ? it : NULL; 2794 } 2795 2796 static void dev_seq_stop(struct seq_file *s, void *v) 2797 { 2798 kfree(s->private); 2799 } 2800 2801 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2802 { 2803 return seq_open(file, &dev_seq_ops); 2804 } 2805 2806 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2807 { 2808 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2809 Sg_device *sdp; 2810 struct scsi_device *scsidp; 2811 2812 sdp = it ? sg_get_dev(it->index) : NULL; 2813 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2814 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2815 scsidp->host->host_no, scsidp->channel, 2816 scsidp->id, scsidp->lun, (int) scsidp->type, 2817 1, 2818 (int) scsidp->queue_depth, 2819 (int) scsidp->device_busy, 2820 (int) scsi_device_online(scsidp)); 2821 else 2822 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2823 return 0; 2824 } 2825 2826 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2827 { 2828 return seq_open(file, &devstrs_seq_ops); 2829 } 2830 2831 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2832 { 2833 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2834 Sg_device *sdp; 2835 struct scsi_device *scsidp; 2836 2837 sdp = it ? sg_get_dev(it->index) : NULL; 2838 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2839 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2840 scsidp->vendor, scsidp->model, scsidp->rev); 2841 else 2842 seq_printf(s, "<no active device>\n"); 2843 return 0; 2844 } 2845 2846 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2847 { 2848 int k, m, new_interface, blen, usg; 2849 Sg_request *srp; 2850 Sg_fd *fp; 2851 const sg_io_hdr_t *hp; 2852 const char * cp; 2853 unsigned int ms; 2854 2855 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { 2856 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2857 "(res)sgat=%d low_dma=%d\n", k + 1, 2858 jiffies_to_msecs(fp->timeout), 2859 fp->reserve.bufflen, 2860 (int) fp->reserve.k_use_sg, 2861 (int) fp->low_dma); 2862 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2863 (int) fp->cmd_q, (int) fp->force_packid, 2864 (int) fp->keep_orphan, (int) fp->closed); 2865 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { 2866 hp = &srp->header; 2867 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2868 if (srp->res_used) { 2869 if (new_interface && 2870 (SG_FLAG_MMAP_IO & hp->flags)) 2871 cp = " mmap>> "; 2872 else 2873 cp = " rb>> "; 2874 } else { 2875 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2876 cp = " dio>> "; 2877 else 2878 cp = " "; 2879 } 2880 seq_printf(s, cp); 2881 blen = srp->data.bufflen; 2882 usg = srp->data.k_use_sg; 2883 seq_printf(s, srp->done ? 2884 ((1 == srp->done) ? "rcv:" : "fin:") 2885 : "act:"); 2886 seq_printf(s, " id=%d blen=%d", 2887 srp->header.pack_id, blen); 2888 if (srp->done) 2889 seq_printf(s, " dur=%d", hp->duration); 2890 else { 2891 ms = jiffies_to_msecs(jiffies); 2892 seq_printf(s, " t_o/elap=%d/%d", 2893 (new_interface ? hp->timeout : 2894 jiffies_to_msecs(fp->timeout)), 2895 (ms > hp->duration ? ms - hp->duration : 0)); 2896 } 2897 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2898 (int) srp->data.cmd_opcode); 2899 } 2900 if (0 == m) 2901 seq_printf(s, " No requests active\n"); 2902 } 2903 } 2904 2905 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2906 { 2907 return seq_open(file, &debug_seq_ops); 2908 } 2909 2910 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2911 { 2912 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2913 Sg_device *sdp; 2914 2915 if (it && (0 == it->index)) { 2916 seq_printf(s, "max_active_device=%d(origin 1)\n", 2917 (int)it->max); 2918 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2919 } 2920 sdp = it ? sg_get_dev(it->index) : NULL; 2921 if (sdp) { 2922 struct scsi_device *scsidp = sdp->device; 2923 2924 if (NULL == scsidp) { 2925 seq_printf(s, "device %d detached ??\n", 2926 (int)it->index); 2927 return 0; 2928 } 2929 2930 if (sg_get_nth_sfp(sdp, 0)) { 2931 seq_printf(s, " >>> device=%s ", 2932 sdp->disk->disk_name); 2933 if (sdp->detached) 2934 seq_printf(s, "detached pending close "); 2935 else 2936 seq_printf 2937 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2938 scsidp->host->host_no, 2939 scsidp->channel, scsidp->id, 2940 scsidp->lun, 2941 scsidp->host->hostt->emulated); 2942 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2943 sdp->sg_tablesize, sdp->exclude); 2944 } 2945 sg_proc_debug_helper(s, sdp); 2946 } 2947 return 0; 2948 } 2949 2950 #endif /* CONFIG_SCSI_PROC_FS */ 2951 2952 module_init(init_sg); 2953 module_exit(exit_sg); 2954