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(sg)) + 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 sg_init_table(schp->buffer, tablesize); 1656 schp->sglist_len = sg_bufflen; 1657 return tablesize; /* number of scat_gath elements allocated */ 1658 } 1659 1660 #ifdef SG_ALLOW_DIO_CODE 1661 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ 1662 /* TODO: hopefully we can use the generic block layer code */ 1663 1664 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if 1665 - mapping of all pages not successful 1666 (i.e., either completely successful or fails) 1667 */ 1668 static int 1669 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, 1670 unsigned long uaddr, size_t count, int rw) 1671 { 1672 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 1673 unsigned long start = uaddr >> PAGE_SHIFT; 1674 const int nr_pages = end - start; 1675 int res, i, j; 1676 struct page **pages; 1677 1678 /* User attempted Overflow! */ 1679 if ((uaddr + count) < uaddr) 1680 return -EINVAL; 1681 1682 /* Too big */ 1683 if (nr_pages > max_pages) 1684 return -ENOMEM; 1685 1686 /* Hmm? */ 1687 if (count == 0) 1688 return 0; 1689 1690 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) 1691 return -ENOMEM; 1692 1693 /* Try to fault in all of the necessary pages */ 1694 down_read(¤t->mm->mmap_sem); 1695 /* rw==READ means read from drive, write into memory area */ 1696 res = get_user_pages( 1697 current, 1698 current->mm, 1699 uaddr, 1700 nr_pages, 1701 rw == READ, 1702 0, /* don't force */ 1703 pages, 1704 NULL); 1705 up_read(¤t->mm->mmap_sem); 1706 1707 /* Errors and no page mapped should return here */ 1708 if (res < nr_pages) 1709 goto out_unmap; 1710 1711 for (i=0; i < nr_pages; i++) { 1712 /* FIXME: flush superflous for rw==READ, 1713 * probably wrong function for rw==WRITE 1714 */ 1715 flush_dcache_page(pages[i]); 1716 /* ?? Is locking needed? I don't think so */ 1717 /* if (TestSetPageLocked(pages[i])) 1718 goto out_unlock; */ 1719 } 1720 1721 sg_set_page(sgl, pages[0], 0, 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 sg_set_page(&sgl[i], pages[i], count < PAGE_SIZE ? count : PAGE_SIZE, 0); 1727 } 1728 else { 1729 sgl[0].length = count; 1730 } 1731 1732 kfree(pages); 1733 return nr_pages; 1734 1735 out_unmap: 1736 if (res > 0) { 1737 for (j=0; j < res; j++) 1738 page_cache_release(pages[j]); 1739 res = 0; 1740 } 1741 kfree(pages); 1742 return res; 1743 } 1744 1745 1746 /* And unmap them... */ 1747 static int 1748 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, 1749 int dirtied) 1750 { 1751 int i; 1752 1753 for (i=0; i < nr_pages; i++) { 1754 struct page *page = sg_page(&sgl[i]); 1755 1756 if (dirtied) 1757 SetPageDirty(page); 1758 /* unlock_page(page); */ 1759 /* FIXME: cache flush missing for rw==READ 1760 * FIXME: call the correct reference counting function 1761 */ 1762 page_cache_release(page); 1763 } 1764 1765 return 0; 1766 } 1767 1768 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ 1769 #endif 1770 1771 1772 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ 1773 static int 1774 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) 1775 { 1776 #ifdef SG_ALLOW_DIO_CODE 1777 sg_io_hdr_t *hp = &srp->header; 1778 Sg_scatter_hold *schp = &srp->data; 1779 int sg_tablesize = sfp->parentdp->sg_tablesize; 1780 int mx_sc_elems, res; 1781 struct scsi_device *sdev = sfp->parentdp->device; 1782 1783 if (((unsigned long)hp->dxferp & 1784 queue_dma_alignment(sdev->request_queue)) != 0) 1785 return 1; 1786 1787 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1788 if (mx_sc_elems <= 0) { 1789 return 1; 1790 } 1791 res = st_map_user_pages(schp->buffer, mx_sc_elems, 1792 (unsigned long)hp->dxferp, dxfer_len, 1793 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0); 1794 if (res <= 0) { 1795 sg_remove_scat(schp); 1796 return 1; 1797 } 1798 schp->k_use_sg = res; 1799 schp->dio_in_use = 1; 1800 hp->info |= SG_INFO_DIRECT_IO; 1801 return 0; 1802 #else 1803 return 1; 1804 #endif 1805 } 1806 1807 static int 1808 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1809 { 1810 struct scatterlist *sg; 1811 int ret_sz = 0, k, rem_sz, num, mx_sc_elems; 1812 int sg_tablesize = sfp->parentdp->sg_tablesize; 1813 int blk_size = buff_size; 1814 struct page *p = NULL; 1815 1816 if (blk_size < 0) 1817 return -EFAULT; 1818 if (0 == blk_size) 1819 ++blk_size; /* don't know why */ 1820 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1821 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); 1822 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1823 buff_size, blk_size)); 1824 1825 /* N.B. ret_sz carried into this block ... */ 1826 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1827 if (mx_sc_elems < 0) 1828 return mx_sc_elems; /* most likely -ENOMEM */ 1829 1830 num = scatter_elem_sz; 1831 if (unlikely(num != scatter_elem_sz_prev)) { 1832 if (num < PAGE_SIZE) { 1833 scatter_elem_sz = PAGE_SIZE; 1834 scatter_elem_sz_prev = PAGE_SIZE; 1835 } else 1836 scatter_elem_sz_prev = num; 1837 } 1838 for (k = 0, sg = schp->buffer, rem_sz = blk_size; 1839 (rem_sz > 0) && (k < mx_sc_elems); 1840 ++k, rem_sz -= ret_sz, sg = sg_next(sg)) { 1841 1842 num = (rem_sz > scatter_elem_sz_prev) ? 1843 scatter_elem_sz_prev : rem_sz; 1844 p = sg_page_malloc(num, sfp->low_dma, &ret_sz); 1845 if (!p) 1846 return -ENOMEM; 1847 1848 if (num == scatter_elem_sz_prev) { 1849 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1850 scatter_elem_sz = ret_sz; 1851 scatter_elem_sz_prev = ret_sz; 1852 } 1853 } 1854 sg_set_page(sg, p, (ret_sz > num) ? num : ret_sz, 0); 1855 1856 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " 1857 "ret_sz=%d\n", k, num, ret_sz)); 1858 } /* end of for loop */ 1859 1860 schp->k_use_sg = k; 1861 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " 1862 "rem_sz=%d\n", k, rem_sz)); 1863 1864 schp->bufflen = blk_size; 1865 if (rem_sz > 0) /* must have failed */ 1866 return -ENOMEM; 1867 1868 return 0; 1869 } 1870 1871 static int 1872 sg_write_xfer(Sg_request * srp) 1873 { 1874 sg_io_hdr_t *hp = &srp->header; 1875 Sg_scatter_hold *schp = &srp->data; 1876 struct scatterlist *sg = schp->buffer; 1877 int num_xfer = 0; 1878 int j, k, onum, usglen, ksglen, res; 1879 int iovec_count = (int) hp->iovec_count; 1880 int dxfer_dir = hp->dxfer_direction; 1881 unsigned char *p; 1882 unsigned char __user *up; 1883 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 1884 1885 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || 1886 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 1887 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); 1888 if (schp->bufflen < num_xfer) 1889 num_xfer = schp->bufflen; 1890 } 1891 if ((num_xfer <= 0) || (schp->dio_in_use) || 1892 (new_interface 1893 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 1894 return 0; 1895 1896 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 1897 num_xfer, iovec_count, schp->k_use_sg)); 1898 if (iovec_count) { 1899 onum = iovec_count; 1900 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 1901 return -EFAULT; 1902 } else 1903 onum = 1; 1904 1905 ksglen = sg->length; 1906 p = page_address(sg_page(sg)); 1907 for (j = 0, k = 0; j < onum; ++j) { 1908 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); 1909 if (res) 1910 return res; 1911 1912 for (; p; sg = sg_next(sg), ksglen = sg->length, 1913 p = page_address(sg_page(sg))) { 1914 if (usglen <= 0) 1915 break; 1916 if (ksglen > usglen) { 1917 if (usglen >= num_xfer) { 1918 if (__copy_from_user(p, up, num_xfer)) 1919 return -EFAULT; 1920 return 0; 1921 } 1922 if (__copy_from_user(p, up, usglen)) 1923 return -EFAULT; 1924 p += usglen; 1925 ksglen -= usglen; 1926 break; 1927 } else { 1928 if (ksglen >= num_xfer) { 1929 if (__copy_from_user(p, up, num_xfer)) 1930 return -EFAULT; 1931 return 0; 1932 } 1933 if (__copy_from_user(p, up, ksglen)) 1934 return -EFAULT; 1935 up += ksglen; 1936 usglen -= ksglen; 1937 } 1938 ++k; 1939 if (k >= schp->k_use_sg) 1940 return 0; 1941 } 1942 } 1943 1944 return 0; 1945 } 1946 1947 static int 1948 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 1949 int wr_xf, int *countp, unsigned char __user **up) 1950 { 1951 int num_xfer = (int) hp->dxfer_len; 1952 unsigned char __user *p = hp->dxferp; 1953 int count; 1954 1955 if (0 == sg_num) { 1956 if (wr_xf && ('\0' == hp->interface_id)) 1957 count = (int) hp->flags; /* holds "old" input_size */ 1958 else 1959 count = num_xfer; 1960 } else { 1961 sg_iovec_t iovec; 1962 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) 1963 return -EFAULT; 1964 p = iovec.iov_base; 1965 count = (int) iovec.iov_len; 1966 } 1967 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) 1968 return -EFAULT; 1969 if (up) 1970 *up = p; 1971 if (countp) 1972 *countp = count; 1973 return 0; 1974 } 1975 1976 static void 1977 sg_remove_scat(Sg_scatter_hold * schp) 1978 { 1979 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1980 if (schp->buffer && (schp->sglist_len > 0)) { 1981 struct scatterlist *sg = schp->buffer; 1982 1983 if (schp->dio_in_use) { 1984 #ifdef SG_ALLOW_DIO_CODE 1985 st_unmap_user_pages(sg, schp->k_use_sg, TRUE); 1986 #endif 1987 } else { 1988 int k; 1989 1990 for (k = 0; (k < schp->k_use_sg) && sg_page(sg); 1991 ++k, sg = sg_next(sg)) { 1992 SCSI_LOG_TIMEOUT(5, printk( 1993 "sg_remove_scat: k=%d, pg=0x%p, len=%d\n", 1994 k, sg_page(sg), sg->length)); 1995 sg_page_free(sg_page(sg), sg->length); 1996 } 1997 } 1998 kfree(schp->buffer); 1999 } 2000 memset(schp, 0, sizeof (*schp)); 2001 } 2002 2003 static int 2004 sg_read_xfer(Sg_request * srp) 2005 { 2006 sg_io_hdr_t *hp = &srp->header; 2007 Sg_scatter_hold *schp = &srp->data; 2008 struct scatterlist *sg = schp->buffer; 2009 int num_xfer = 0; 2010 int j, k, onum, usglen, ksglen, res; 2011 int iovec_count = (int) hp->iovec_count; 2012 int dxfer_dir = hp->dxfer_direction; 2013 unsigned char *p; 2014 unsigned char __user *up; 2015 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 2016 2017 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) 2018 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 2019 num_xfer = hp->dxfer_len; 2020 if (schp->bufflen < num_xfer) 2021 num_xfer = schp->bufflen; 2022 } 2023 if ((num_xfer <= 0) || (schp->dio_in_use) || 2024 (new_interface 2025 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 2026 return 0; 2027 2028 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 2029 num_xfer, iovec_count, schp->k_use_sg)); 2030 if (iovec_count) { 2031 onum = iovec_count; 2032 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 2033 return -EFAULT; 2034 } else 2035 onum = 1; 2036 2037 p = page_address(sg_page(sg)); 2038 ksglen = sg->length; 2039 for (j = 0, k = 0; j < onum; ++j) { 2040 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); 2041 if (res) 2042 return res; 2043 2044 for (; p; sg = sg_next(sg), ksglen = sg->length, 2045 p = page_address(sg_page(sg))) { 2046 if (usglen <= 0) 2047 break; 2048 if (ksglen > usglen) { 2049 if (usglen >= num_xfer) { 2050 if (__copy_to_user(up, p, num_xfer)) 2051 return -EFAULT; 2052 return 0; 2053 } 2054 if (__copy_to_user(up, p, usglen)) 2055 return -EFAULT; 2056 p += usglen; 2057 ksglen -= usglen; 2058 break; 2059 } else { 2060 if (ksglen >= num_xfer) { 2061 if (__copy_to_user(up, p, num_xfer)) 2062 return -EFAULT; 2063 return 0; 2064 } 2065 if (__copy_to_user(up, p, ksglen)) 2066 return -EFAULT; 2067 up += ksglen; 2068 usglen -= ksglen; 2069 } 2070 ++k; 2071 if (k >= schp->k_use_sg) 2072 return 0; 2073 } 2074 } 2075 2076 return 0; 2077 } 2078 2079 static int 2080 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 2081 { 2082 Sg_scatter_hold *schp = &srp->data; 2083 struct scatterlist *sg = schp->buffer; 2084 int k, num; 2085 2086 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 2087 num_read_xfer)); 2088 if ((!outp) || (num_read_xfer <= 0)) 2089 return 0; 2090 2091 for (k = 0; (k < schp->k_use_sg) && sg_page(sg); ++k, sg = sg_next(sg)) { 2092 num = sg->length; 2093 if (num > num_read_xfer) { 2094 if (__copy_to_user(outp, page_address(sg_page(sg)), 2095 num_read_xfer)) 2096 return -EFAULT; 2097 break; 2098 } else { 2099 if (__copy_to_user(outp, page_address(sg_page(sg)), 2100 num)) 2101 return -EFAULT; 2102 num_read_xfer -= num; 2103 if (num_read_xfer <= 0) 2104 break; 2105 outp += num; 2106 } 2107 } 2108 2109 return 0; 2110 } 2111 2112 static void 2113 sg_build_reserve(Sg_fd * sfp, int req_size) 2114 { 2115 Sg_scatter_hold *schp = &sfp->reserve; 2116 2117 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 2118 do { 2119 if (req_size < PAGE_SIZE) 2120 req_size = PAGE_SIZE; 2121 if (0 == sg_build_indirect(schp, sfp, req_size)) 2122 return; 2123 else 2124 sg_remove_scat(schp); 2125 req_size >>= 1; /* divide by 2 */ 2126 } while (req_size > (PAGE_SIZE / 2)); 2127 } 2128 2129 static void 2130 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 2131 { 2132 Sg_scatter_hold *req_schp = &srp->data; 2133 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2134 struct scatterlist *sg = rsv_schp->buffer; 2135 int k, num, rem; 2136 2137 srp->res_used = 1; 2138 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 2139 rem = size; 2140 2141 for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) { 2142 num = sg->length; 2143 if (rem <= num) { 2144 sfp->save_scat_len = num; 2145 sg->length = rem; 2146 req_schp->k_use_sg = k + 1; 2147 req_schp->sglist_len = rsv_schp->sglist_len; 2148 req_schp->buffer = rsv_schp->buffer; 2149 2150 req_schp->bufflen = size; 2151 req_schp->b_malloc_len = rsv_schp->b_malloc_len; 2152 break; 2153 } else 2154 rem -= num; 2155 } 2156 2157 if (k >= rsv_schp->k_use_sg) 2158 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 2159 } 2160 2161 static void 2162 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 2163 { 2164 Sg_scatter_hold *req_schp = &srp->data; 2165 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2166 2167 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 2168 (int) req_schp->k_use_sg)); 2169 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { 2170 struct scatterlist *sg = rsv_schp->buffer; 2171 2172 if (sfp->save_scat_len > 0) 2173 (sg + (req_schp->k_use_sg - 1))->length = 2174 (unsigned) sfp->save_scat_len; 2175 else 2176 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); 2177 } 2178 req_schp->k_use_sg = 0; 2179 req_schp->bufflen = 0; 2180 req_schp->buffer = NULL; 2181 req_schp->sglist_len = 0; 2182 sfp->save_scat_len = 0; 2183 srp->res_used = 0; 2184 } 2185 2186 static Sg_request * 2187 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 2188 { 2189 Sg_request *resp; 2190 unsigned long iflags; 2191 2192 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2193 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 2194 /* look for requests that are ready + not SG_IO owned */ 2195 if ((1 == resp->done) && (!resp->sg_io_owned) && 2196 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 2197 resp->done = 2; /* guard against other readers */ 2198 break; 2199 } 2200 } 2201 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2202 return resp; 2203 } 2204 2205 #ifdef CONFIG_SCSI_PROC_FS 2206 static Sg_request * 2207 sg_get_nth_request(Sg_fd * sfp, int nth) 2208 { 2209 Sg_request *resp; 2210 unsigned long iflags; 2211 int k; 2212 2213 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2214 for (k = 0, resp = sfp->headrp; resp && (k < nth); 2215 ++k, resp = resp->nextrp) ; 2216 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2217 return resp; 2218 } 2219 #endif 2220 2221 /* always adds to end of list */ 2222 static Sg_request * 2223 sg_add_request(Sg_fd * sfp) 2224 { 2225 int k; 2226 unsigned long iflags; 2227 Sg_request *resp; 2228 Sg_request *rp = sfp->req_arr; 2229 2230 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2231 resp = sfp->headrp; 2232 if (!resp) { 2233 memset(rp, 0, sizeof (Sg_request)); 2234 rp->parentfp = sfp; 2235 resp = rp; 2236 sfp->headrp = resp; 2237 } else { 2238 if (0 == sfp->cmd_q) 2239 resp = NULL; /* command queuing disallowed */ 2240 else { 2241 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2242 if (!rp->parentfp) 2243 break; 2244 } 2245 if (k < SG_MAX_QUEUE) { 2246 memset(rp, 0, sizeof (Sg_request)); 2247 rp->parentfp = sfp; 2248 while (resp->nextrp) 2249 resp = resp->nextrp; 2250 resp->nextrp = rp; 2251 resp = rp; 2252 } else 2253 resp = NULL; 2254 } 2255 } 2256 if (resp) { 2257 resp->nextrp = NULL; 2258 resp->header.duration = jiffies_to_msecs(jiffies); 2259 } 2260 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2261 return resp; 2262 } 2263 2264 /* Return of 1 for found; 0 for not found */ 2265 static int 2266 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2267 { 2268 Sg_request *prev_rp; 2269 Sg_request *rp; 2270 unsigned long iflags; 2271 int res = 0; 2272 2273 if ((!sfp) || (!srp) || (!sfp->headrp)) 2274 return res; 2275 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2276 prev_rp = sfp->headrp; 2277 if (srp == prev_rp) { 2278 sfp->headrp = prev_rp->nextrp; 2279 prev_rp->parentfp = NULL; 2280 res = 1; 2281 } else { 2282 while ((rp = prev_rp->nextrp)) { 2283 if (srp == rp) { 2284 prev_rp->nextrp = rp->nextrp; 2285 rp->parentfp = NULL; 2286 res = 1; 2287 break; 2288 } 2289 prev_rp = rp; 2290 } 2291 } 2292 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2293 return res; 2294 } 2295 2296 #ifdef CONFIG_SCSI_PROC_FS 2297 static Sg_fd * 2298 sg_get_nth_sfp(Sg_device * sdp, int nth) 2299 { 2300 Sg_fd *resp; 2301 unsigned long iflags; 2302 int k; 2303 2304 read_lock_irqsave(&sg_index_lock, iflags); 2305 for (k = 0, resp = sdp->headfp; resp && (k < nth); 2306 ++k, resp = resp->nextfp) ; 2307 read_unlock_irqrestore(&sg_index_lock, iflags); 2308 return resp; 2309 } 2310 #endif 2311 2312 static Sg_fd * 2313 sg_add_sfp(Sg_device * sdp, int dev) 2314 { 2315 Sg_fd *sfp; 2316 unsigned long iflags; 2317 int bufflen; 2318 2319 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2320 if (!sfp) 2321 return NULL; 2322 2323 init_waitqueue_head(&sfp->read_wait); 2324 rwlock_init(&sfp->rq_list_lock); 2325 2326 sfp->timeout = SG_DEFAULT_TIMEOUT; 2327 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2328 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2329 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2330 sdp->device->host->unchecked_isa_dma : 1; 2331 sfp->cmd_q = SG_DEF_COMMAND_Q; 2332 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2333 sfp->parentdp = sdp; 2334 write_lock_irqsave(&sg_index_lock, iflags); 2335 if (!sdp->headfp) 2336 sdp->headfp = sfp; 2337 else { /* add to tail of existing list */ 2338 Sg_fd *pfp = sdp->headfp; 2339 while (pfp->nextfp) 2340 pfp = pfp->nextfp; 2341 pfp->nextfp = sfp; 2342 } 2343 write_unlock_irqrestore(&sg_index_lock, iflags); 2344 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2345 if (unlikely(sg_big_buff != def_reserved_size)) 2346 sg_big_buff = def_reserved_size; 2347 2348 bufflen = min_t(int, sg_big_buff, 2349 sdp->device->request_queue->max_sectors * 512); 2350 sg_build_reserve(sfp, bufflen); 2351 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2352 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2353 return sfp; 2354 } 2355 2356 static void 2357 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2358 { 2359 Sg_fd *fp; 2360 Sg_fd *prev_fp; 2361 2362 prev_fp = sdp->headfp; 2363 if (sfp == prev_fp) 2364 sdp->headfp = prev_fp->nextfp; 2365 else { 2366 while ((fp = prev_fp->nextfp)) { 2367 if (sfp == fp) { 2368 prev_fp->nextfp = fp->nextfp; 2369 break; 2370 } 2371 prev_fp = fp; 2372 } 2373 } 2374 if (sfp->reserve.bufflen > 0) { 2375 SCSI_LOG_TIMEOUT(6, 2376 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2377 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); 2378 sg_remove_scat(&sfp->reserve); 2379 } 2380 sfp->parentdp = NULL; 2381 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); 2382 kfree(sfp); 2383 } 2384 2385 /* Returns 0 in normal case, 1 when detached and sdp object removed */ 2386 static int 2387 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2388 { 2389 Sg_request *srp; 2390 Sg_request *tsrp; 2391 int dirty = 0; 2392 int res = 0; 2393 2394 for (srp = sfp->headrp; srp; srp = tsrp) { 2395 tsrp = srp->nextrp; 2396 if (sg_srp_done(srp, sfp)) 2397 sg_finish_rem_req(srp); 2398 else 2399 ++dirty; 2400 } 2401 if (0 == dirty) { 2402 unsigned long iflags; 2403 2404 write_lock_irqsave(&sg_index_lock, iflags); 2405 __sg_remove_sfp(sdp, sfp); 2406 if (sdp->detached && (NULL == sdp->headfp)) { 2407 idr_remove(&sg_index_idr, sdp->index); 2408 kfree(sdp); 2409 res = 1; 2410 } 2411 write_unlock_irqrestore(&sg_index_lock, iflags); 2412 } else { 2413 /* MOD_INC's to inhibit unloading sg and associated adapter driver */ 2414 /* only bump the access_count if we actually succeeded in 2415 * throwing another counter on the host module */ 2416 scsi_device_get(sdp->device); /* XXX: retval ignored? */ 2417 sfp->closed = 1; /* flag dirty state on this fd */ 2418 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", 2419 dirty)); 2420 } 2421 return res; 2422 } 2423 2424 static int 2425 sg_res_in_use(Sg_fd * sfp) 2426 { 2427 const Sg_request *srp; 2428 unsigned long iflags; 2429 2430 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2431 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2432 if (srp->res_used) 2433 break; 2434 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2435 return srp ? 1 : 0; 2436 } 2437 2438 /* The size fetched (value output via retSzp) set when non-NULL return */ 2439 static struct page * 2440 sg_page_malloc(int rqSz, int lowDma, int *retSzp) 2441 { 2442 struct page *resp = NULL; 2443 gfp_t page_mask; 2444 int order, a_size; 2445 int resSz; 2446 2447 if ((rqSz <= 0) || (NULL == retSzp)) 2448 return resp; 2449 2450 if (lowDma) 2451 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN; 2452 else 2453 page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 2454 2455 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; 2456 order++, a_size <<= 1) ; 2457 resSz = a_size; /* rounded up if necessary */ 2458 resp = alloc_pages(page_mask, order); 2459 while ((!resp) && order) { 2460 --order; 2461 a_size >>= 1; /* divide by 2, until PAGE_SIZE */ 2462 resp = alloc_pages(page_mask, order); /* try half */ 2463 resSz = a_size; 2464 } 2465 if (resp) { 2466 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2467 memset(page_address(resp), 0, resSz); 2468 *retSzp = resSz; 2469 } 2470 return resp; 2471 } 2472 2473 static void 2474 sg_page_free(struct page *page, int size) 2475 { 2476 int order, a_size; 2477 2478 if (!page) 2479 return; 2480 for (order = 0, a_size = PAGE_SIZE; a_size < size; 2481 order++, a_size <<= 1) ; 2482 __free_pages(page, order); 2483 } 2484 2485 #ifndef MAINTENANCE_IN_CMD 2486 #define MAINTENANCE_IN_CMD 0xa3 2487 #endif 2488 2489 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, 2490 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, 2491 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, 2492 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD 2493 }; 2494 2495 static int 2496 sg_allow_access(unsigned char opcode, char dev_type) 2497 { 2498 int k; 2499 2500 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */ 2501 return 1; 2502 for (k = 0; k < sizeof (allow_ops); ++k) { 2503 if (opcode == allow_ops[k]) 2504 return 1; 2505 } 2506 return 0; 2507 } 2508 2509 #ifdef CONFIG_SCSI_PROC_FS 2510 static int 2511 sg_idr_max_id(int id, void *p, void *data) 2512 { 2513 int *k = data; 2514 2515 if (*k < id) 2516 *k = id; 2517 2518 return 0; 2519 } 2520 2521 static int 2522 sg_last_dev(void) 2523 { 2524 int k = 0; 2525 unsigned long iflags; 2526 2527 read_lock_irqsave(&sg_index_lock, iflags); 2528 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2529 read_unlock_irqrestore(&sg_index_lock, iflags); 2530 return k + 1; /* origin 1 */ 2531 } 2532 #endif 2533 2534 static Sg_device * 2535 sg_get_dev(int dev) 2536 { 2537 Sg_device *sdp; 2538 unsigned long iflags; 2539 2540 read_lock_irqsave(&sg_index_lock, iflags); 2541 sdp = idr_find(&sg_index_idr, dev); 2542 read_unlock_irqrestore(&sg_index_lock, iflags); 2543 2544 return sdp; 2545 } 2546 2547 #ifdef CONFIG_SCSI_PROC_FS 2548 2549 static struct proc_dir_entry *sg_proc_sgp = NULL; 2550 2551 static char sg_proc_sg_dirname[] = "scsi/sg"; 2552 2553 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2554 2555 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2556 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2557 size_t count, loff_t *off); 2558 static struct file_operations adio_fops = { 2559 /* .owner, .read and .llseek added in sg_proc_init() */ 2560 .open = sg_proc_single_open_adio, 2561 .write = sg_proc_write_adio, 2562 .release = single_release, 2563 }; 2564 2565 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2566 static ssize_t sg_proc_write_dressz(struct file *filp, 2567 const char __user *buffer, size_t count, loff_t *off); 2568 static struct file_operations dressz_fops = { 2569 .open = sg_proc_single_open_dressz, 2570 .write = sg_proc_write_dressz, 2571 .release = single_release, 2572 }; 2573 2574 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2575 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2576 static struct file_operations version_fops = { 2577 .open = sg_proc_single_open_version, 2578 .release = single_release, 2579 }; 2580 2581 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2582 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2583 static struct file_operations devhdr_fops = { 2584 .open = sg_proc_single_open_devhdr, 2585 .release = single_release, 2586 }; 2587 2588 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2589 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2590 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2591 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2592 static void dev_seq_stop(struct seq_file *s, void *v); 2593 static struct file_operations dev_fops = { 2594 .open = sg_proc_open_dev, 2595 .release = seq_release, 2596 }; 2597 static struct seq_operations dev_seq_ops = { 2598 .start = dev_seq_start, 2599 .next = dev_seq_next, 2600 .stop = dev_seq_stop, 2601 .show = sg_proc_seq_show_dev, 2602 }; 2603 2604 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2605 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2606 static struct file_operations devstrs_fops = { 2607 .open = sg_proc_open_devstrs, 2608 .release = seq_release, 2609 }; 2610 static struct seq_operations devstrs_seq_ops = { 2611 .start = dev_seq_start, 2612 .next = dev_seq_next, 2613 .stop = dev_seq_stop, 2614 .show = sg_proc_seq_show_devstrs, 2615 }; 2616 2617 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2618 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2619 static struct file_operations debug_fops = { 2620 .open = sg_proc_open_debug, 2621 .release = seq_release, 2622 }; 2623 static struct seq_operations debug_seq_ops = { 2624 .start = dev_seq_start, 2625 .next = dev_seq_next, 2626 .stop = dev_seq_stop, 2627 .show = sg_proc_seq_show_debug, 2628 }; 2629 2630 2631 struct sg_proc_leaf { 2632 const char * name; 2633 struct file_operations * fops; 2634 }; 2635 2636 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2637 {"allow_dio", &adio_fops}, 2638 {"debug", &debug_fops}, 2639 {"def_reserved_size", &dressz_fops}, 2640 {"device_hdr", &devhdr_fops}, 2641 {"devices", &dev_fops}, 2642 {"device_strs", &devstrs_fops}, 2643 {"version", &version_fops} 2644 }; 2645 2646 static int 2647 sg_proc_init(void) 2648 { 2649 int k, mask; 2650 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2651 struct proc_dir_entry *pdep; 2652 struct sg_proc_leaf * leaf; 2653 2654 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2655 if (!sg_proc_sgp) 2656 return 1; 2657 for (k = 0; k < num_leaves; ++k) { 2658 leaf = &sg_proc_leaf_arr[k]; 2659 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2660 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp); 2661 if (pdep) { 2662 leaf->fops->owner = THIS_MODULE, 2663 leaf->fops->read = seq_read, 2664 leaf->fops->llseek = seq_lseek, 2665 pdep->proc_fops = leaf->fops; 2666 } 2667 } 2668 return 0; 2669 } 2670 2671 static void 2672 sg_proc_cleanup(void) 2673 { 2674 int k; 2675 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2676 2677 if (!sg_proc_sgp) 2678 return; 2679 for (k = 0; k < num_leaves; ++k) 2680 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2681 remove_proc_entry(sg_proc_sg_dirname, NULL); 2682 } 2683 2684 2685 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2686 { 2687 seq_printf(s, "%d\n", *((int *)s->private)); 2688 return 0; 2689 } 2690 2691 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2692 { 2693 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2694 } 2695 2696 static ssize_t 2697 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2698 size_t count, loff_t *off) 2699 { 2700 int num; 2701 char buff[11]; 2702 2703 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2704 return -EACCES; 2705 num = (count < 10) ? count : 10; 2706 if (copy_from_user(buff, buffer, num)) 2707 return -EFAULT; 2708 buff[num] = '\0'; 2709 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2710 return count; 2711 } 2712 2713 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2714 { 2715 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2716 } 2717 2718 static ssize_t 2719 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2720 size_t count, loff_t *off) 2721 { 2722 int num; 2723 unsigned long k = ULONG_MAX; 2724 char buff[11]; 2725 2726 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2727 return -EACCES; 2728 num = (count < 10) ? count : 10; 2729 if (copy_from_user(buff, buffer, num)) 2730 return -EFAULT; 2731 buff[num] = '\0'; 2732 k = simple_strtoul(buff, NULL, 10); 2733 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2734 sg_big_buff = k; 2735 return count; 2736 } 2737 return -ERANGE; 2738 } 2739 2740 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2741 { 2742 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2743 sg_version_date); 2744 return 0; 2745 } 2746 2747 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2748 { 2749 return single_open(file, sg_proc_seq_show_version, NULL); 2750 } 2751 2752 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2753 { 2754 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2755 "online\n"); 2756 return 0; 2757 } 2758 2759 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2760 { 2761 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2762 } 2763 2764 struct sg_proc_deviter { 2765 loff_t index; 2766 size_t max; 2767 }; 2768 2769 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2770 { 2771 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2772 2773 s->private = it; 2774 if (! it) 2775 return NULL; 2776 2777 it->index = *pos; 2778 it->max = sg_last_dev(); 2779 if (it->index >= it->max) 2780 return NULL; 2781 return it; 2782 } 2783 2784 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2785 { 2786 struct sg_proc_deviter * it = s->private; 2787 2788 *pos = ++it->index; 2789 return (it->index < it->max) ? it : NULL; 2790 } 2791 2792 static void dev_seq_stop(struct seq_file *s, void *v) 2793 { 2794 kfree(s->private); 2795 } 2796 2797 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2798 { 2799 return seq_open(file, &dev_seq_ops); 2800 } 2801 2802 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2803 { 2804 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2805 Sg_device *sdp; 2806 struct scsi_device *scsidp; 2807 2808 sdp = it ? sg_get_dev(it->index) : NULL; 2809 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2810 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2811 scsidp->host->host_no, scsidp->channel, 2812 scsidp->id, scsidp->lun, (int) scsidp->type, 2813 1, 2814 (int) scsidp->queue_depth, 2815 (int) scsidp->device_busy, 2816 (int) scsi_device_online(scsidp)); 2817 else 2818 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2819 return 0; 2820 } 2821 2822 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2823 { 2824 return seq_open(file, &devstrs_seq_ops); 2825 } 2826 2827 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2828 { 2829 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2830 Sg_device *sdp; 2831 struct scsi_device *scsidp; 2832 2833 sdp = it ? sg_get_dev(it->index) : NULL; 2834 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2835 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2836 scsidp->vendor, scsidp->model, scsidp->rev); 2837 else 2838 seq_printf(s, "<no active device>\n"); 2839 return 0; 2840 } 2841 2842 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2843 { 2844 int k, m, new_interface, blen, usg; 2845 Sg_request *srp; 2846 Sg_fd *fp; 2847 const sg_io_hdr_t *hp; 2848 const char * cp; 2849 unsigned int ms; 2850 2851 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { 2852 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2853 "(res)sgat=%d low_dma=%d\n", k + 1, 2854 jiffies_to_msecs(fp->timeout), 2855 fp->reserve.bufflen, 2856 (int) fp->reserve.k_use_sg, 2857 (int) fp->low_dma); 2858 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2859 (int) fp->cmd_q, (int) fp->force_packid, 2860 (int) fp->keep_orphan, (int) fp->closed); 2861 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { 2862 hp = &srp->header; 2863 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2864 if (srp->res_used) { 2865 if (new_interface && 2866 (SG_FLAG_MMAP_IO & hp->flags)) 2867 cp = " mmap>> "; 2868 else 2869 cp = " rb>> "; 2870 } else { 2871 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2872 cp = " dio>> "; 2873 else 2874 cp = " "; 2875 } 2876 seq_printf(s, cp); 2877 blen = srp->data.bufflen; 2878 usg = srp->data.k_use_sg; 2879 seq_printf(s, srp->done ? 2880 ((1 == srp->done) ? "rcv:" : "fin:") 2881 : "act:"); 2882 seq_printf(s, " id=%d blen=%d", 2883 srp->header.pack_id, blen); 2884 if (srp->done) 2885 seq_printf(s, " dur=%d", hp->duration); 2886 else { 2887 ms = jiffies_to_msecs(jiffies); 2888 seq_printf(s, " t_o/elap=%d/%d", 2889 (new_interface ? hp->timeout : 2890 jiffies_to_msecs(fp->timeout)), 2891 (ms > hp->duration ? ms - hp->duration : 0)); 2892 } 2893 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2894 (int) srp->data.cmd_opcode); 2895 } 2896 if (0 == m) 2897 seq_printf(s, " No requests active\n"); 2898 } 2899 } 2900 2901 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2902 { 2903 return seq_open(file, &debug_seq_ops); 2904 } 2905 2906 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2907 { 2908 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2909 Sg_device *sdp; 2910 2911 if (it && (0 == it->index)) { 2912 seq_printf(s, "max_active_device=%d(origin 1)\n", 2913 (int)it->max); 2914 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2915 } 2916 sdp = it ? sg_get_dev(it->index) : NULL; 2917 if (sdp) { 2918 struct scsi_device *scsidp = sdp->device; 2919 2920 if (NULL == scsidp) { 2921 seq_printf(s, "device %d detached ??\n", 2922 (int)it->index); 2923 return 0; 2924 } 2925 2926 if (sg_get_nth_sfp(sdp, 0)) { 2927 seq_printf(s, " >>> device=%s ", 2928 sdp->disk->disk_name); 2929 if (sdp->detached) 2930 seq_printf(s, "detached pending close "); 2931 else 2932 seq_printf 2933 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2934 scsidp->host->host_no, 2935 scsidp->channel, scsidp->id, 2936 scsidp->lun, 2937 scsidp->host->hostt->emulated); 2938 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2939 sdp->sg_tablesize, sdp->exclude); 2940 } 2941 sg_proc_debug_helper(s, sdp); 2942 } 2943 return 0; 2944 } 2945 2946 #endif /* CONFIG_SCSI_PROC_FS */ 2947 2948 module_init(init_sg); 2949 module_exit(exit_sg); 2950