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 = 30533; /* 2 digits for each component */ 22 #define SG_VERSION_STR "3.5.33" 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/config.h> 32 #include <linux/module.h> 33 34 #include <linux/fs.h> 35 #include <linux/kernel.h> 36 #include <linux/sched.h> 37 #include <linux/string.h> 38 #include <linux/mm.h> 39 #include <linux/errno.h> 40 #include <linux/mtio.h> 41 #include <linux/ioctl.h> 42 #include <linux/fcntl.h> 43 #include <linux/init.h> 44 #include <linux/poll.h> 45 #include <linux/smp_lock.h> 46 #include <linux/moduleparam.h> 47 #include <linux/cdev.h> 48 #include <linux/seq_file.h> 49 #include <linux/blkdev.h> 50 #include <linux/delay.h> 51 #include <linux/scatterlist.h> 52 53 #include "scsi.h" 54 #include <scsi/scsi_dbg.h> 55 #include <scsi/scsi_host.h> 56 #include <scsi/scsi_driver.h> 57 #include <scsi/scsi_ioctl.h> 58 #include <scsi/sg.h> 59 60 #include "scsi_logging.h" 61 62 #ifdef CONFIG_SCSI_PROC_FS 63 #include <linux/proc_fs.h> 64 static char *sg_version_date = "20050908"; 65 66 static int sg_proc_init(void); 67 static void sg_proc_cleanup(void); 68 #endif 69 70 #define SG_ALLOW_DIO_DEF 0 71 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */ 72 73 #define SG_MAX_DEVS 32768 74 75 /* 76 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 77 * Then when using 32 bit integers x * m may overflow during the calculation. 78 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 79 * calculates the same, but prevents the overflow when both m and d 80 * are "small" numbers (like HZ and USER_HZ). 81 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 82 * in 32 bits. 83 */ 84 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 85 86 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 87 88 int sg_big_buff = SG_DEF_RESERVED_SIZE; 89 /* N.B. This variable is readable and writeable via 90 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 91 of this size (or less if there is not enough memory) will be reserved 92 for use by this file descriptor. [Deprecated usage: this variable is also 93 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 94 the kernel (i.e. it is not a module).] */ 95 static int def_reserved_size = -1; /* picks up init parameter */ 96 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 97 98 #define SG_SECTOR_SZ 512 99 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) 100 101 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */ 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_RWLOCK(sg_dev_arr_lock); /* Also used to lock 107 file descriptor list for device */ 108 109 static struct class_interface sg_interface = { 110 .add = sg_add, 111 .remove = sg_remove, 112 }; 113 114 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 115 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 116 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */ 117 unsigned bufflen; /* Size of (aggregate) data buffer */ 118 unsigned b_malloc_len; /* actual len malloc'ed in buffer */ 119 struct scatterlist *buffer;/* scatter list */ 120 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 121 unsigned char cmd_opcode; /* first byte of command */ 122 } Sg_scatter_hold; 123 124 struct sg_device; /* forward declarations */ 125 struct sg_fd; 126 127 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 128 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 129 struct sg_fd *parentfp; /* NULL -> not in use */ 130 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 131 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 132 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; 133 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 134 char orphan; /* 1 -> drop on sight, 0 -> normal */ 135 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 136 volatile char done; /* 0->before bh, 1->before read, 2->read */ 137 } Sg_request; 138 139 typedef struct sg_fd { /* holds the state of a file descriptor */ 140 struct sg_fd *nextfp; /* NULL when last opened fd on this device */ 141 struct sg_device *parentdp; /* owning device */ 142 wait_queue_head_t read_wait; /* queue read until command done */ 143 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 144 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 145 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 146 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 147 unsigned save_scat_len; /* original length of trunc. scat. element */ 148 Sg_request *headrp; /* head of request slist, NULL->empty */ 149 struct fasync_struct *async_qp; /* used by asynchronous notification */ 150 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 151 char low_dma; /* as in parent but possibly overridden to 1 */ 152 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 153 volatile char closed; /* 1 -> fd closed but request(s) outstanding */ 154 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 155 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ 156 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 157 char mmap_called; /* 0 -> mmap() never called on this fd */ 158 } Sg_fd; 159 160 typedef struct sg_device { /* holds the state of each scsi generic device */ 161 struct scsi_device *device; 162 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ 163 int sg_tablesize; /* adapter's max scatter-gather table size */ 164 Sg_fd *headfp; /* first open fd belonging to this device */ 165 volatile char detached; /* 0->attached, 1->detached pending removal */ 166 volatile char exclude; /* opened for exclusive access */ 167 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 168 struct gendisk *disk; 169 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 170 } Sg_device; 171 172 static int sg_fasync(int fd, struct file *filp, int mode); 173 /* tasklet or soft irq callback */ 174 static void sg_cmd_done(void *data, char *sense, int result, int resid); 175 static int sg_start_req(Sg_request * srp); 176 static void sg_finish_rem_req(Sg_request * srp); 177 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 178 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, 179 int tablesize); 180 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 181 Sg_request * srp); 182 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 183 int blocking, int read_only, Sg_request ** o_srp); 184 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 185 unsigned char *cmnd, int timeout, int blocking); 186 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 187 int wr_xf, int *countp, unsigned char __user **up); 188 static int sg_write_xfer(Sg_request * srp); 189 static int sg_read_xfer(Sg_request * srp); 190 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 191 static void sg_remove_scat(Sg_scatter_hold * schp); 192 static void sg_build_reserve(Sg_fd * sfp, int req_size); 193 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 194 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 195 static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp); 196 static void sg_page_free(struct page *page, int size); 197 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 198 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 199 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 200 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 201 static Sg_request *sg_add_request(Sg_fd * sfp); 202 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 203 static int sg_res_in_use(Sg_fd * sfp); 204 static int sg_allow_access(unsigned char opcode, char dev_type); 205 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); 206 static Sg_device *sg_get_dev(int dev); 207 #ifdef CONFIG_SCSI_PROC_FS 208 static int sg_last_dev(void); 209 #endif 210 211 static Sg_device **sg_dev_arr = NULL; 212 static int sg_dev_max; 213 static int sg_nr_dev; 214 215 #define SZ_SG_HEADER sizeof(struct sg_header) 216 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 217 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 218 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 219 220 static int 221 sg_open(struct inode *inode, struct file *filp) 222 { 223 int dev = iminor(inode); 224 int flags = filp->f_flags; 225 struct request_queue *q; 226 Sg_device *sdp; 227 Sg_fd *sfp; 228 int res; 229 int retval; 230 231 nonseekable_open(inode, filp); 232 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 233 sdp = sg_get_dev(dev); 234 if ((!sdp) || (!sdp->device)) 235 return -ENXIO; 236 if (sdp->detached) 237 return -ENODEV; 238 239 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 240 /* Prevent the device driver from vanishing while we sleep */ 241 retval = scsi_device_get(sdp->device); 242 if (retval) 243 return retval; 244 245 if (!((flags & O_NONBLOCK) || 246 scsi_block_when_processing_errors(sdp->device))) { 247 retval = -ENXIO; 248 /* we are in error recovery for this device */ 249 goto error_out; 250 } 251 252 if (flags & O_EXCL) { 253 if (O_RDONLY == (flags & O_ACCMODE)) { 254 retval = -EPERM; /* Can't lock it with read only access */ 255 goto error_out; 256 } 257 if (sdp->headfp && (flags & O_NONBLOCK)) { 258 retval = -EBUSY; 259 goto error_out; 260 } 261 res = 0; 262 __wait_event_interruptible(sdp->o_excl_wait, 263 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); 264 if (res) { 265 retval = res; /* -ERESTARTSYS because signal hit process */ 266 goto error_out; 267 } 268 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ 269 if (flags & O_NONBLOCK) { 270 retval = -EBUSY; 271 goto error_out; 272 } 273 res = 0; 274 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), 275 res); 276 if (res) { 277 retval = res; /* -ERESTARTSYS because signal hit process */ 278 goto error_out; 279 } 280 } 281 if (sdp->detached) { 282 retval = -ENODEV; 283 goto error_out; 284 } 285 if (!sdp->headfp) { /* no existing opens on this device */ 286 sdp->sgdebug = 0; 287 q = sdp->device->request_queue; 288 sdp->sg_tablesize = min(q->max_hw_segments, 289 q->max_phys_segments); 290 } 291 if ((sfp = sg_add_sfp(sdp, dev))) 292 filp->private_data = sfp; 293 else { 294 if (flags & O_EXCL) 295 sdp->exclude = 0; /* undo if error */ 296 retval = -ENOMEM; 297 goto error_out; 298 } 299 return 0; 300 301 error_out: 302 scsi_device_put(sdp->device); 303 return retval; 304 } 305 306 /* Following function was formerly called 'sg_close' */ 307 static int 308 sg_release(struct inode *inode, struct file *filp) 309 { 310 Sg_device *sdp; 311 Sg_fd *sfp; 312 313 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 314 return -ENXIO; 315 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 316 sg_fasync(-1, filp, 0); /* remove filp from async notification list */ 317 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ 318 if (!sdp->detached) { 319 scsi_device_put(sdp->device); 320 } 321 sdp->exclude = 0; 322 wake_up_interruptible(&sdp->o_excl_wait); 323 } 324 return 0; 325 } 326 327 static ssize_t 328 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 329 { 330 Sg_device *sdp; 331 Sg_fd *sfp; 332 Sg_request *srp; 333 int req_pack_id = -1; 334 sg_io_hdr_t *hp; 335 struct sg_header *old_hdr = NULL; 336 int retval = 0; 337 338 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 339 return -ENXIO; 340 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 341 sdp->disk->disk_name, (int) count)); 342 343 if (!access_ok(VERIFY_WRITE, buf, count)) 344 return -EFAULT; 345 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 346 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 347 if (!old_hdr) 348 return -ENOMEM; 349 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 350 retval = -EFAULT; 351 goto free_old_hdr; 352 } 353 if (old_hdr->reply_len < 0) { 354 if (count >= SZ_SG_IO_HDR) { 355 sg_io_hdr_t *new_hdr; 356 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 357 if (!new_hdr) { 358 retval = -ENOMEM; 359 goto free_old_hdr; 360 } 361 retval =__copy_from_user 362 (new_hdr, buf, SZ_SG_IO_HDR); 363 req_pack_id = new_hdr->pack_id; 364 kfree(new_hdr); 365 if (retval) { 366 retval = -EFAULT; 367 goto free_old_hdr; 368 } 369 } 370 } else 371 req_pack_id = old_hdr->pack_id; 372 } 373 srp = sg_get_rq_mark(sfp, req_pack_id); 374 if (!srp) { /* now wait on packet to arrive */ 375 if (sdp->detached) { 376 retval = -ENODEV; 377 goto free_old_hdr; 378 } 379 if (filp->f_flags & O_NONBLOCK) { 380 retval = -EAGAIN; 381 goto free_old_hdr; 382 } 383 while (1) { 384 retval = 0; /* following macro beats race condition */ 385 __wait_event_interruptible(sfp->read_wait, 386 (sdp->detached || 387 (srp = sg_get_rq_mark(sfp, req_pack_id))), 388 retval); 389 if (sdp->detached) { 390 retval = -ENODEV; 391 goto free_old_hdr; 392 } 393 if (0 == retval) 394 break; 395 396 /* -ERESTARTSYS as signal hit process */ 397 goto free_old_hdr; 398 } 399 } 400 if (srp->header.interface_id != '\0') { 401 retval = sg_new_read(sfp, buf, count, srp); 402 goto free_old_hdr; 403 } 404 405 hp = &srp->header; 406 if (old_hdr == NULL) { 407 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 408 if (! old_hdr) { 409 retval = -ENOMEM; 410 goto free_old_hdr; 411 } 412 } 413 memset(old_hdr, 0, SZ_SG_HEADER); 414 old_hdr->reply_len = (int) hp->timeout; 415 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 416 old_hdr->pack_id = hp->pack_id; 417 old_hdr->twelve_byte = 418 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 419 old_hdr->target_status = hp->masked_status; 420 old_hdr->host_status = hp->host_status; 421 old_hdr->driver_status = hp->driver_status; 422 if ((CHECK_CONDITION & hp->masked_status) || 423 (DRIVER_SENSE & hp->driver_status)) 424 memcpy(old_hdr->sense_buffer, srp->sense_b, 425 sizeof (old_hdr->sense_buffer)); 426 switch (hp->host_status) { 427 /* This setup of 'result' is for backward compatibility and is best 428 ignored by the user who should use target, host + driver status */ 429 case DID_OK: 430 case DID_PASSTHROUGH: 431 case DID_SOFT_ERROR: 432 old_hdr->result = 0; 433 break; 434 case DID_NO_CONNECT: 435 case DID_BUS_BUSY: 436 case DID_TIME_OUT: 437 old_hdr->result = EBUSY; 438 break; 439 case DID_BAD_TARGET: 440 case DID_ABORT: 441 case DID_PARITY: 442 case DID_RESET: 443 case DID_BAD_INTR: 444 old_hdr->result = EIO; 445 break; 446 case DID_ERROR: 447 old_hdr->result = (srp->sense_b[0] == 0 && 448 hp->masked_status == GOOD) ? 0 : EIO; 449 break; 450 default: 451 old_hdr->result = EIO; 452 break; 453 } 454 455 /* Now copy the result back to the user buffer. */ 456 if (count >= SZ_SG_HEADER) { 457 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 458 retval = -EFAULT; 459 goto free_old_hdr; 460 } 461 buf += SZ_SG_HEADER; 462 if (count > old_hdr->reply_len) 463 count = old_hdr->reply_len; 464 if (count > SZ_SG_HEADER) { 465 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 466 retval = -EFAULT; 467 goto free_old_hdr; 468 } 469 } 470 } else 471 count = (old_hdr->result == 0) ? 0 : -EIO; 472 sg_finish_rem_req(srp); 473 retval = count; 474 free_old_hdr: 475 kfree(old_hdr); 476 return retval; 477 } 478 479 static ssize_t 480 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 481 { 482 sg_io_hdr_t *hp = &srp->header; 483 int err = 0; 484 int len; 485 486 if (count < SZ_SG_IO_HDR) { 487 err = -EINVAL; 488 goto err_out; 489 } 490 hp->sb_len_wr = 0; 491 if ((hp->mx_sb_len > 0) && hp->sbp) { 492 if ((CHECK_CONDITION & hp->masked_status) || 493 (DRIVER_SENSE & hp->driver_status)) { 494 int sb_len = SCSI_SENSE_BUFFERSIZE; 495 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 496 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 497 len = (len > sb_len) ? sb_len : len; 498 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 499 err = -EFAULT; 500 goto err_out; 501 } 502 hp->sb_len_wr = len; 503 } 504 } 505 if (hp->masked_status || hp->host_status || hp->driver_status) 506 hp->info |= SG_INFO_CHECK; 507 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 508 err = -EFAULT; 509 goto err_out; 510 } 511 err = sg_read_xfer(srp); 512 err_out: 513 sg_finish_rem_req(srp); 514 return (0 == err) ? count : err; 515 } 516 517 static ssize_t 518 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 519 { 520 int mxsize, cmd_size, k; 521 int input_size, blocking; 522 unsigned char opcode; 523 Sg_device *sdp; 524 Sg_fd *sfp; 525 Sg_request *srp; 526 struct sg_header old_hdr; 527 sg_io_hdr_t *hp; 528 unsigned char cmnd[MAX_COMMAND_SIZE]; 529 530 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 531 return -ENXIO; 532 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 533 sdp->disk->disk_name, (int) count)); 534 if (sdp->detached) 535 return -ENODEV; 536 if (!((filp->f_flags & O_NONBLOCK) || 537 scsi_block_when_processing_errors(sdp->device))) 538 return -ENXIO; 539 540 if (!access_ok(VERIFY_READ, buf, count)) 541 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 542 if (count < SZ_SG_HEADER) 543 return -EIO; 544 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 545 return -EFAULT; 546 blocking = !(filp->f_flags & O_NONBLOCK); 547 if (old_hdr.reply_len < 0) 548 return sg_new_write(sfp, buf, count, blocking, 0, NULL); 549 if (count < (SZ_SG_HEADER + 6)) 550 return -EIO; /* The minimum scsi command length is 6 bytes. */ 551 552 if (!(srp = sg_add_request(sfp))) { 553 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 554 return -EDOM; 555 } 556 buf += SZ_SG_HEADER; 557 __get_user(opcode, buf); 558 if (sfp->next_cmd_len > 0) { 559 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 560 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 561 sfp->next_cmd_len = 0; 562 sg_remove_request(sfp, srp); 563 return -EIO; 564 } 565 cmd_size = sfp->next_cmd_len; 566 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 567 } else { 568 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 569 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 570 cmd_size = 12; 571 } 572 SCSI_LOG_TIMEOUT(4, printk( 573 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 574 /* Determine buffer size. */ 575 input_size = count - cmd_size; 576 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 577 mxsize -= SZ_SG_HEADER; 578 input_size -= SZ_SG_HEADER; 579 if (input_size < 0) { 580 sg_remove_request(sfp, srp); 581 return -EIO; /* User did not pass enough bytes for this command. */ 582 } 583 hp = &srp->header; 584 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 585 hp->cmd_len = (unsigned char) cmd_size; 586 hp->iovec_count = 0; 587 hp->mx_sb_len = 0; 588 if (input_size > 0) 589 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 590 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 591 else 592 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 593 hp->dxfer_len = mxsize; 594 hp->dxferp = (char __user *)buf + cmd_size; 595 hp->sbp = NULL; 596 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 597 hp->flags = input_size; /* structure abuse ... */ 598 hp->pack_id = old_hdr.pack_id; 599 hp->usr_ptr = NULL; 600 if (__copy_from_user(cmnd, buf, cmd_size)) 601 return -EFAULT; 602 /* 603 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 604 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 605 * is a non-zero input_size, so emit a warning. 606 */ 607 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) 608 if (printk_ratelimit()) 609 printk(KERN_WARNING 610 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" 611 "guessing data in;\n" KERN_WARNING " " 612 "program %s not setting count and/or reply_len properly\n", 613 old_hdr.reply_len - (int)SZ_SG_HEADER, 614 input_size, (unsigned int) cmnd[0], 615 current->comm); 616 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 617 return (k < 0) ? k : count; 618 } 619 620 static ssize_t 621 sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 622 int blocking, int read_only, Sg_request ** o_srp) 623 { 624 int k; 625 Sg_request *srp; 626 sg_io_hdr_t *hp; 627 unsigned char cmnd[MAX_COMMAND_SIZE]; 628 int timeout; 629 unsigned long ul_timeout; 630 631 if (count < SZ_SG_IO_HDR) 632 return -EINVAL; 633 if (!access_ok(VERIFY_READ, buf, count)) 634 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 635 636 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 637 if (!(srp = sg_add_request(sfp))) { 638 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 639 return -EDOM; 640 } 641 hp = &srp->header; 642 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 643 sg_remove_request(sfp, srp); 644 return -EFAULT; 645 } 646 if (hp->interface_id != 'S') { 647 sg_remove_request(sfp, srp); 648 return -ENOSYS; 649 } 650 if (hp->flags & SG_FLAG_MMAP_IO) { 651 if (hp->dxfer_len > sfp->reserve.bufflen) { 652 sg_remove_request(sfp, srp); 653 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 654 } 655 if (hp->flags & SG_FLAG_DIRECT_IO) { 656 sg_remove_request(sfp, srp); 657 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 658 } 659 if (sg_res_in_use(sfp)) { 660 sg_remove_request(sfp, srp); 661 return -EBUSY; /* reserve buffer already being used */ 662 } 663 } 664 ul_timeout = msecs_to_jiffies(srp->header.timeout); 665 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 666 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 667 sg_remove_request(sfp, srp); 668 return -EMSGSIZE; 669 } 670 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 671 sg_remove_request(sfp, srp); 672 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 673 } 674 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 675 sg_remove_request(sfp, srp); 676 return -EFAULT; 677 } 678 if (read_only && 679 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) { 680 sg_remove_request(sfp, srp); 681 return -EPERM; 682 } 683 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 684 if (k < 0) 685 return k; 686 if (o_srp) 687 *o_srp = srp; 688 return count; 689 } 690 691 static int 692 sg_common_write(Sg_fd * sfp, Sg_request * srp, 693 unsigned char *cmnd, int timeout, int blocking) 694 { 695 int k, data_dir; 696 Sg_device *sdp = sfp->parentdp; 697 sg_io_hdr_t *hp = &srp->header; 698 699 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 700 hp->status = 0; 701 hp->masked_status = 0; 702 hp->msg_status = 0; 703 hp->info = 0; 704 hp->host_status = 0; 705 hp->driver_status = 0; 706 hp->resid = 0; 707 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 708 (int) cmnd[0], (int) hp->cmd_len)); 709 710 if ((k = sg_start_req(srp))) { 711 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k)); 712 sg_finish_rem_req(srp); 713 return k; /* probably out of space --> ENOMEM */ 714 } 715 if ((k = sg_write_xfer(srp))) { 716 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n")); 717 sg_finish_rem_req(srp); 718 return k; 719 } 720 if (sdp->detached) { 721 sg_finish_rem_req(srp); 722 return -ENODEV; 723 } 724 725 switch (hp->dxfer_direction) { 726 case SG_DXFER_TO_FROM_DEV: 727 case SG_DXFER_FROM_DEV: 728 data_dir = DMA_FROM_DEVICE; 729 break; 730 case SG_DXFER_TO_DEV: 731 data_dir = DMA_TO_DEVICE; 732 break; 733 case SG_DXFER_UNKNOWN: 734 data_dir = DMA_BIDIRECTIONAL; 735 break; 736 default: 737 data_dir = DMA_NONE; 738 break; 739 } 740 hp->duration = jiffies_to_msecs(jiffies); 741 /* Now send everything of to mid-level. The next time we hear about this 742 packet is when sg_cmd_done() is called (i.e. a callback). */ 743 if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer, 744 hp->dxfer_len, srp->data.k_use_sg, timeout, 745 SG_DEFAULT_RETRIES, srp, sg_cmd_done, 746 GFP_ATOMIC)) { 747 SCSI_LOG_TIMEOUT(1, printk("sg_write: scsi_execute_async failed\n")); 748 /* 749 * most likely out of mem, but could also be a bad map 750 */ 751 return -ENOMEM; 752 } else 753 return 0; 754 } 755 756 static int 757 sg_srp_done(Sg_request *srp, Sg_fd *sfp) 758 { 759 unsigned long iflags; 760 int done; 761 762 read_lock_irqsave(&sfp->rq_list_lock, iflags); 763 done = srp->done; 764 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 765 return done; 766 } 767 768 static int 769 sg_ioctl(struct inode *inode, struct file *filp, 770 unsigned int cmd_in, unsigned long arg) 771 { 772 void __user *p = (void __user *)arg; 773 int __user *ip = p; 774 int result, val, read_only; 775 Sg_device *sdp; 776 Sg_fd *sfp; 777 Sg_request *srp; 778 unsigned long iflags; 779 780 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 781 return -ENXIO; 782 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 783 sdp->disk->disk_name, (int) cmd_in)); 784 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 785 786 switch (cmd_in) { 787 case SG_IO: 788 { 789 int blocking = 1; /* ignore O_NONBLOCK flag */ 790 791 if (sdp->detached) 792 return -ENODEV; 793 if (!scsi_block_when_processing_errors(sdp->device)) 794 return -ENXIO; 795 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 796 return -EFAULT; 797 result = 798 sg_new_write(sfp, p, SZ_SG_IO_HDR, 799 blocking, read_only, &srp); 800 if (result < 0) 801 return result; 802 srp->sg_io_owned = 1; 803 while (1) { 804 result = 0; /* following macro to beat race condition */ 805 __wait_event_interruptible(sfp->read_wait, 806 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), 807 result); 808 if (sdp->detached) 809 return -ENODEV; 810 if (sfp->closed) 811 return 0; /* request packet dropped already */ 812 if (0 == result) 813 break; 814 srp->orphan = 1; 815 return result; /* -ERESTARTSYS because signal hit process */ 816 } 817 write_lock_irqsave(&sfp->rq_list_lock, iflags); 818 srp->done = 2; 819 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 820 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 821 return (result < 0) ? result : 0; 822 } 823 case SG_SET_TIMEOUT: 824 result = get_user(val, ip); 825 if (result) 826 return result; 827 if (val < 0) 828 return -EIO; 829 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 830 val = MULDIV (INT_MAX, USER_HZ, HZ); 831 sfp->timeout_user = val; 832 sfp->timeout = MULDIV (val, HZ, USER_HZ); 833 834 return 0; 835 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 836 /* strange ..., for backward compatibility */ 837 return sfp->timeout_user; 838 case SG_SET_FORCE_LOW_DMA: 839 result = get_user(val, ip); 840 if (result) 841 return result; 842 if (val) { 843 sfp->low_dma = 1; 844 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 845 val = (int) sfp->reserve.bufflen; 846 sg_remove_scat(&sfp->reserve); 847 sg_build_reserve(sfp, val); 848 } 849 } else { 850 if (sdp->detached) 851 return -ENODEV; 852 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 853 } 854 return 0; 855 case SG_GET_LOW_DMA: 856 return put_user((int) sfp->low_dma, ip); 857 case SG_GET_SCSI_ID: 858 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 859 return -EFAULT; 860 else { 861 sg_scsi_id_t __user *sg_idp = p; 862 863 if (sdp->detached) 864 return -ENODEV; 865 __put_user((int) sdp->device->host->host_no, 866 &sg_idp->host_no); 867 __put_user((int) sdp->device->channel, 868 &sg_idp->channel); 869 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 870 __put_user((int) sdp->device->lun, &sg_idp->lun); 871 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 872 __put_user((short) sdp->device->host->cmd_per_lun, 873 &sg_idp->h_cmd_per_lun); 874 __put_user((short) sdp->device->queue_depth, 875 &sg_idp->d_queue_depth); 876 __put_user(0, &sg_idp->unused[0]); 877 __put_user(0, &sg_idp->unused[1]); 878 return 0; 879 } 880 case SG_SET_FORCE_PACK_ID: 881 result = get_user(val, ip); 882 if (result) 883 return result; 884 sfp->force_packid = val ? 1 : 0; 885 return 0; 886 case SG_GET_PACK_ID: 887 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 888 return -EFAULT; 889 read_lock_irqsave(&sfp->rq_list_lock, iflags); 890 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 891 if ((1 == srp->done) && (!srp->sg_io_owned)) { 892 read_unlock_irqrestore(&sfp->rq_list_lock, 893 iflags); 894 __put_user(srp->header.pack_id, ip); 895 return 0; 896 } 897 } 898 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 899 __put_user(-1, ip); 900 return 0; 901 case SG_GET_NUM_WAITING: 902 read_lock_irqsave(&sfp->rq_list_lock, iflags); 903 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 904 if ((1 == srp->done) && (!srp->sg_io_owned)) 905 ++val; 906 } 907 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 908 return put_user(val, ip); 909 case SG_GET_SG_TABLESIZE: 910 return put_user(sdp->sg_tablesize, ip); 911 case SG_SET_RESERVED_SIZE: 912 result = get_user(val, ip); 913 if (result) 914 return result; 915 if (val < 0) 916 return -EINVAL; 917 if (val != sfp->reserve.bufflen) { 918 if (sg_res_in_use(sfp) || sfp->mmap_called) 919 return -EBUSY; 920 sg_remove_scat(&sfp->reserve); 921 sg_build_reserve(sfp, val); 922 } 923 return 0; 924 case SG_GET_RESERVED_SIZE: 925 val = (int) sfp->reserve.bufflen; 926 return put_user(val, ip); 927 case SG_SET_COMMAND_Q: 928 result = get_user(val, ip); 929 if (result) 930 return result; 931 sfp->cmd_q = val ? 1 : 0; 932 return 0; 933 case SG_GET_COMMAND_Q: 934 return put_user((int) sfp->cmd_q, ip); 935 case SG_SET_KEEP_ORPHAN: 936 result = get_user(val, ip); 937 if (result) 938 return result; 939 sfp->keep_orphan = val; 940 return 0; 941 case SG_GET_KEEP_ORPHAN: 942 return put_user((int) sfp->keep_orphan, ip); 943 case SG_NEXT_CMD_LEN: 944 result = get_user(val, ip); 945 if (result) 946 return result; 947 sfp->next_cmd_len = (val > 0) ? val : 0; 948 return 0; 949 case SG_GET_VERSION_NUM: 950 return put_user(sg_version_num, ip); 951 case SG_GET_ACCESS_COUNT: 952 /* faked - we don't have a real access count anymore */ 953 val = (sdp->device ? 1 : 0); 954 return put_user(val, ip); 955 case SG_GET_REQUEST_TABLE: 956 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 957 return -EFAULT; 958 else { 959 sg_req_info_t *rinfo; 960 unsigned int ms; 961 962 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 963 GFP_KERNEL); 964 if (!rinfo) 965 return -ENOMEM; 966 read_lock_irqsave(&sfp->rq_list_lock, iflags); 967 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 968 ++val, srp = srp ? srp->nextrp : srp) { 969 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 970 if (srp) { 971 rinfo[val].req_state = srp->done + 1; 972 rinfo[val].problem = 973 srp->header.masked_status & 974 srp->header.host_status & 975 srp->header.driver_status; 976 if (srp->done) 977 rinfo[val].duration = 978 srp->header.duration; 979 else { 980 ms = jiffies_to_msecs(jiffies); 981 rinfo[val].duration = 982 (ms > srp->header.duration) ? 983 (ms - srp->header.duration) : 0; 984 } 985 rinfo[val].orphan = srp->orphan; 986 rinfo[val].sg_io_owned = 987 srp->sg_io_owned; 988 rinfo[val].pack_id = 989 srp->header.pack_id; 990 rinfo[val].usr_ptr = 991 srp->header.usr_ptr; 992 } 993 } 994 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 995 result = __copy_to_user(p, rinfo, 996 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 997 result = result ? -EFAULT : 0; 998 kfree(rinfo); 999 return result; 1000 } 1001 case SG_EMULATED_HOST: 1002 if (sdp->detached) 1003 return -ENODEV; 1004 return put_user(sdp->device->host->hostt->emulated, ip); 1005 case SG_SCSI_RESET: 1006 if (sdp->detached) 1007 return -ENODEV; 1008 if (filp->f_flags & O_NONBLOCK) { 1009 if (scsi_host_in_recovery(sdp->device->host)) 1010 return -EBUSY; 1011 } else if (!scsi_block_when_processing_errors(sdp->device)) 1012 return -EBUSY; 1013 result = get_user(val, ip); 1014 if (result) 1015 return result; 1016 if (SG_SCSI_RESET_NOTHING == val) 1017 return 0; 1018 switch (val) { 1019 case SG_SCSI_RESET_DEVICE: 1020 val = SCSI_TRY_RESET_DEVICE; 1021 break; 1022 case SG_SCSI_RESET_BUS: 1023 val = SCSI_TRY_RESET_BUS; 1024 break; 1025 case SG_SCSI_RESET_HOST: 1026 val = SCSI_TRY_RESET_HOST; 1027 break; 1028 default: 1029 return -EINVAL; 1030 } 1031 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1032 return -EACCES; 1033 return (scsi_reset_provider(sdp->device, val) == 1034 SUCCESS) ? 0 : -EIO; 1035 case SCSI_IOCTL_SEND_COMMAND: 1036 if (sdp->detached) 1037 return -ENODEV; 1038 if (read_only) { 1039 unsigned char opcode = WRITE_6; 1040 Scsi_Ioctl_Command __user *siocp = p; 1041 1042 if (copy_from_user(&opcode, siocp->data, 1)) 1043 return -EFAULT; 1044 if (!sg_allow_access(opcode, sdp->device->type)) 1045 return -EPERM; 1046 } 1047 return scsi_ioctl_send_command(sdp->device, p); 1048 case SG_SET_DEBUG: 1049 result = get_user(val, ip); 1050 if (result) 1051 return result; 1052 sdp->sgdebug = (char) val; 1053 return 0; 1054 case SCSI_IOCTL_GET_IDLUN: 1055 case SCSI_IOCTL_GET_BUS_NUMBER: 1056 case SCSI_IOCTL_PROBE_HOST: 1057 case SG_GET_TRANSFORM: 1058 if (sdp->detached) 1059 return -ENODEV; 1060 return scsi_ioctl(sdp->device, cmd_in, p); 1061 default: 1062 if (read_only) 1063 return -EPERM; /* don't know so take safe approach */ 1064 return scsi_ioctl(sdp->device, cmd_in, p); 1065 } 1066 } 1067 1068 #ifdef CONFIG_COMPAT 1069 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1070 { 1071 Sg_device *sdp; 1072 Sg_fd *sfp; 1073 struct scsi_device *sdev; 1074 1075 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1076 return -ENXIO; 1077 1078 sdev = sdp->device; 1079 if (sdev->host->hostt->compat_ioctl) { 1080 int ret; 1081 1082 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1083 1084 return ret; 1085 } 1086 1087 return -ENOIOCTLCMD; 1088 } 1089 #endif 1090 1091 static unsigned int 1092 sg_poll(struct file *filp, poll_table * wait) 1093 { 1094 unsigned int res = 0; 1095 Sg_device *sdp; 1096 Sg_fd *sfp; 1097 Sg_request *srp; 1098 int count = 0; 1099 unsigned long iflags; 1100 1101 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) 1102 || sfp->closed) 1103 return POLLERR; 1104 poll_wait(filp, &sfp->read_wait, wait); 1105 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1106 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1107 /* if any read waiting, flag it */ 1108 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1109 res = POLLIN | POLLRDNORM; 1110 ++count; 1111 } 1112 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1113 1114 if (sdp->detached) 1115 res |= POLLHUP; 1116 else if (!sfp->cmd_q) { 1117 if (0 == count) 1118 res |= POLLOUT | POLLWRNORM; 1119 } else if (count < SG_MAX_QUEUE) 1120 res |= POLLOUT | POLLWRNORM; 1121 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1122 sdp->disk->disk_name, (int) res)); 1123 return res; 1124 } 1125 1126 static int 1127 sg_fasync(int fd, struct file *filp, int mode) 1128 { 1129 int retval; 1130 Sg_device *sdp; 1131 Sg_fd *sfp; 1132 1133 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1134 return -ENXIO; 1135 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1136 sdp->disk->disk_name, mode)); 1137 1138 retval = fasync_helper(fd, filp, mode, &sfp->async_qp); 1139 return (retval < 0) ? retval : 0; 1140 } 1141 1142 static struct page * 1143 sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type) 1144 { 1145 Sg_fd *sfp; 1146 struct page *page = NOPAGE_SIGBUS; 1147 unsigned long offset, len, sa; 1148 Sg_scatter_hold *rsv_schp; 1149 struct scatterlist *sg; 1150 int k; 1151 1152 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1153 return page; 1154 rsv_schp = &sfp->reserve; 1155 offset = addr - vma->vm_start; 1156 if (offset >= rsv_schp->bufflen) 1157 return page; 1158 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n", 1159 offset, rsv_schp->k_use_sg)); 1160 sg = rsv_schp->buffer; 1161 sa = vma->vm_start; 1162 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1163 ++k, ++sg) { 1164 len = vma->vm_end - sa; 1165 len = (len < sg->length) ? len : sg->length; 1166 if (offset < len) { 1167 page = sg->page; 1168 get_page(page); /* increment page count */ 1169 break; 1170 } 1171 sa += len; 1172 offset -= len; 1173 } 1174 1175 if (type) 1176 *type = VM_FAULT_MINOR; 1177 return page; 1178 } 1179 1180 static struct vm_operations_struct sg_mmap_vm_ops = { 1181 .nopage = sg_vma_nopage, 1182 }; 1183 1184 static int 1185 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1186 { 1187 Sg_fd *sfp; 1188 unsigned long req_sz, len, sa; 1189 Sg_scatter_hold *rsv_schp; 1190 int k; 1191 struct scatterlist *sg; 1192 1193 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1194 return -ENXIO; 1195 req_sz = vma->vm_end - vma->vm_start; 1196 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1197 (void *) vma->vm_start, (int) req_sz)); 1198 if (vma->vm_pgoff) 1199 return -EINVAL; /* want no offset */ 1200 rsv_schp = &sfp->reserve; 1201 if (req_sz > rsv_schp->bufflen) 1202 return -ENOMEM; /* cannot map more than reserved buffer */ 1203 1204 sa = vma->vm_start; 1205 sg = rsv_schp->buffer; 1206 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1207 ++k, ++sg) { 1208 len = vma->vm_end - sa; 1209 len = (len < sg->length) ? len : sg->length; 1210 sa += len; 1211 } 1212 1213 sfp->mmap_called = 1; 1214 vma->vm_flags |= VM_RESERVED; 1215 vma->vm_private_data = sfp; 1216 vma->vm_ops = &sg_mmap_vm_ops; 1217 return 0; 1218 } 1219 1220 /* This function is a "bottom half" handler that is called by the 1221 * mid level when a command is completed (or has failed). */ 1222 static void 1223 sg_cmd_done(void *data, char *sense, int result, int resid) 1224 { 1225 Sg_request *srp = data; 1226 Sg_device *sdp = NULL; 1227 Sg_fd *sfp; 1228 unsigned long iflags; 1229 unsigned int ms; 1230 1231 if (NULL == srp) { 1232 printk(KERN_ERR "sg_cmd_done: NULL request\n"); 1233 return; 1234 } 1235 sfp = srp->parentfp; 1236 if (sfp) 1237 sdp = sfp->parentdp; 1238 if ((NULL == sdp) || sdp->detached) { 1239 printk(KERN_INFO "sg_cmd_done: device detached\n"); 1240 return; 1241 } 1242 1243 1244 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1245 sdp->disk->disk_name, srp->header.pack_id, result)); 1246 srp->header.resid = resid; 1247 ms = jiffies_to_msecs(jiffies); 1248 srp->header.duration = (ms > srp->header.duration) ? 1249 (ms - srp->header.duration) : 0; 1250 if (0 != result) { 1251 struct scsi_sense_hdr sshdr; 1252 1253 memcpy(srp->sense_b, sense, sizeof (srp->sense_b)); 1254 srp->header.status = 0xff & result; 1255 srp->header.masked_status = status_byte(result); 1256 srp->header.msg_status = msg_byte(result); 1257 srp->header.host_status = host_byte(result); 1258 srp->header.driver_status = driver_byte(result); 1259 if ((sdp->sgdebug > 0) && 1260 ((CHECK_CONDITION == srp->header.masked_status) || 1261 (COMMAND_TERMINATED == srp->header.masked_status))) 1262 __scsi_print_sense("sg_cmd_done", sense, 1263 SCSI_SENSE_BUFFERSIZE); 1264 1265 /* Following if statement is a patch supplied by Eric Youngdale */ 1266 if (driver_byte(result) != 0 1267 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1268 && !scsi_sense_is_deferred(&sshdr) 1269 && sshdr.sense_key == UNIT_ATTENTION 1270 && sdp->device->removable) { 1271 /* Detected possible disc change. Set the bit - this */ 1272 /* may be used if there are filesystems using this device */ 1273 sdp->device->changed = 1; 1274 } 1275 } 1276 /* Rely on write phase to clean out srp status values, so no "else" */ 1277 1278 if (sfp->closed) { /* whoops this fd already released, cleanup */ 1279 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); 1280 sg_finish_rem_req(srp); 1281 srp = NULL; 1282 if (NULL == sfp->headrp) { 1283 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n")); 1284 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ 1285 scsi_device_put(sdp->device); 1286 } 1287 sfp = NULL; 1288 } 1289 } else if (srp && srp->orphan) { 1290 if (sfp->keep_orphan) 1291 srp->sg_io_owned = 0; 1292 else { 1293 sg_finish_rem_req(srp); 1294 srp = NULL; 1295 } 1296 } 1297 if (sfp && srp) { 1298 /* Now wake up any sg_read() that is waiting for this packet. */ 1299 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1300 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1301 srp->done = 1; 1302 wake_up_interruptible(&sfp->read_wait); 1303 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1304 } 1305 } 1306 1307 static struct file_operations sg_fops = { 1308 .owner = THIS_MODULE, 1309 .read = sg_read, 1310 .write = sg_write, 1311 .poll = sg_poll, 1312 .ioctl = sg_ioctl, 1313 #ifdef CONFIG_COMPAT 1314 .compat_ioctl = sg_compat_ioctl, 1315 #endif 1316 .open = sg_open, 1317 .mmap = sg_mmap, 1318 .release = sg_release, 1319 .fasync = sg_fasync, 1320 }; 1321 1322 static struct class *sg_sysfs_class; 1323 1324 static int sg_sysfs_valid = 0; 1325 1326 static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1327 { 1328 struct request_queue *q = scsidp->request_queue; 1329 Sg_device *sdp; 1330 unsigned long iflags; 1331 void *old_sg_dev_arr = NULL; 1332 int k, error; 1333 1334 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1335 if (!sdp) { 1336 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1337 return -ENOMEM; 1338 } 1339 1340 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1341 if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */ 1342 Sg_device **tmp_da; 1343 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP; 1344 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1345 1346 tmp_da = kzalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL); 1347 if (unlikely(!tmp_da)) 1348 goto expand_failed; 1349 1350 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1351 memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *)); 1352 old_sg_dev_arr = sg_dev_arr; 1353 sg_dev_arr = tmp_da; 1354 sg_dev_max = tmp_dev_max; 1355 } 1356 1357 for (k = 0; k < sg_dev_max; k++) 1358 if (!sg_dev_arr[k]) 1359 break; 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 1371 sg_nr_dev++; 1372 sg_dev_arr[k] = sdp; 1373 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1374 error = k; 1375 1376 out: 1377 if (error < 0) 1378 kfree(sdp); 1379 kfree(old_sg_dev_arr); 1380 return error; 1381 1382 expand_failed: 1383 printk(KERN_WARNING "sg_alloc: device array cannot be resized\n"); 1384 error = -ENOMEM; 1385 goto out; 1386 1387 overflow: 1388 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1389 sdev_printk(KERN_WARNING, scsidp, 1390 "Unable to attach sg device type=%d, minor " 1391 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); 1392 error = -ENODEV; 1393 goto out; 1394 } 1395 1396 static int 1397 sg_add(struct class_device *cl_dev, struct class_interface *cl_intf) 1398 { 1399 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); 1400 struct gendisk *disk; 1401 Sg_device *sdp = NULL; 1402 struct cdev * cdev = NULL; 1403 int error, k; 1404 1405 disk = alloc_disk(1); 1406 if (!disk) { 1407 printk(KERN_WARNING "alloc_disk failed\n"); 1408 return -ENOMEM; 1409 } 1410 disk->major = SCSI_GENERIC_MAJOR; 1411 1412 error = -ENOMEM; 1413 cdev = cdev_alloc(); 1414 if (!cdev) { 1415 printk(KERN_WARNING "cdev_alloc failed\n"); 1416 goto out; 1417 } 1418 cdev->owner = THIS_MODULE; 1419 cdev->ops = &sg_fops; 1420 1421 error = sg_alloc(disk, scsidp); 1422 if (error < 0) { 1423 printk(KERN_WARNING "sg_alloc failed\n"); 1424 goto out; 1425 } 1426 k = error; 1427 sdp = sg_dev_arr[k]; 1428 1429 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1); 1430 if (error) 1431 goto out; 1432 1433 sdp->cdev = cdev; 1434 if (sg_sysfs_valid) { 1435 struct class_device * sg_class_member; 1436 1437 sg_class_member = class_device_create(sg_sysfs_class, NULL, 1438 MKDEV(SCSI_GENERIC_MAJOR, k), 1439 cl_dev->dev, "%s", 1440 disk->disk_name); 1441 if (IS_ERR(sg_class_member)) 1442 printk(KERN_WARNING "sg_add: " 1443 "class_device_create failed\n"); 1444 class_set_devdata(sg_class_member, sdp); 1445 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1446 &sg_class_member->kobj, "generic"); 1447 if (error) 1448 printk(KERN_ERR "sg_add: unable to make symlink " 1449 "'generic' back to sg%d\n", k); 1450 } else 1451 printk(KERN_WARNING "sg_add: sg_sys INvalid\n"); 1452 1453 sdev_printk(KERN_NOTICE, scsidp, 1454 "Attached scsi generic sg%d type %d\n", k,scsidp->type); 1455 1456 return 0; 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 = NULL; 1470 unsigned long iflags; 1471 Sg_fd *sfp; 1472 Sg_fd *tsfp; 1473 Sg_request *srp; 1474 Sg_request *tsrp; 1475 int k, delay; 1476 1477 if (NULL == sg_dev_arr) 1478 return; 1479 delay = 0; 1480 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1481 for (k = 0; k < sg_dev_max; k++) { 1482 sdp = sg_dev_arr[k]; 1483 if ((NULL == sdp) || (sdp->device != scsidp)) 1484 continue; /* dirty but lowers nesting */ 1485 if (sdp->headfp) { 1486 sdp->detached = 1; 1487 for (sfp = sdp->headfp; sfp; sfp = tsfp) { 1488 tsfp = sfp->nextfp; 1489 for (srp = sfp->headrp; srp; srp = tsrp) { 1490 tsrp = srp->nextrp; 1491 if (sfp->closed || (0 == sg_srp_done(srp, sfp))) 1492 sg_finish_rem_req(srp); 1493 } 1494 if (sfp->closed) { 1495 scsi_device_put(sdp->device); 1496 __sg_remove_sfp(sdp, sfp); 1497 } else { 1498 delay = 1; 1499 wake_up_interruptible(&sfp->read_wait); 1500 kill_fasync(&sfp->async_qp, SIGPOLL, 1501 POLL_HUP); 1502 } 1503 } 1504 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k)); 1505 if (NULL == sdp->headfp) { 1506 sg_dev_arr[k] = NULL; 1507 } 1508 } else { /* nothing active, simple case */ 1509 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k)); 1510 sg_dev_arr[k] = NULL; 1511 } 1512 sg_nr_dev--; 1513 break; 1514 } 1515 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1516 1517 if (sdp) { 1518 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1519 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k)); 1520 cdev_del(sdp->cdev); 1521 sdp->cdev = NULL; 1522 put_disk(sdp->disk); 1523 sdp->disk = NULL; 1524 if (NULL == sdp->headfp) 1525 kfree((char *) sdp); 1526 } 1527 1528 if (delay) 1529 msleep(10); /* dirty detach so delay device destruction */ 1530 } 1531 1532 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 1533 * of sysfs parameters (which module_param doesn't yet support). 1534 * Sysfs parameters defined explicitly below. 1535 */ 1536 module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO); 1537 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1538 1539 MODULE_AUTHOR("Douglas Gilbert"); 1540 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1541 MODULE_LICENSE("GPL"); 1542 MODULE_VERSION(SG_VERSION_STR); 1543 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1544 1545 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1546 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1547 1548 static int __init 1549 init_sg(void) 1550 { 1551 int rc; 1552 1553 if (def_reserved_size >= 0) 1554 sg_big_buff = def_reserved_size; 1555 1556 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1557 SG_MAX_DEVS, "sg"); 1558 if (rc) 1559 return rc; 1560 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1561 if ( IS_ERR(sg_sysfs_class) ) { 1562 rc = PTR_ERR(sg_sysfs_class); 1563 goto err_out; 1564 } 1565 sg_sysfs_valid = 1; 1566 rc = scsi_register_interface(&sg_interface); 1567 if (0 == rc) { 1568 #ifdef CONFIG_SCSI_PROC_FS 1569 sg_proc_init(); 1570 #endif /* CONFIG_SCSI_PROC_FS */ 1571 return 0; 1572 } 1573 class_destroy(sg_sysfs_class); 1574 err_out: 1575 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1576 return rc; 1577 } 1578 1579 static void __exit 1580 exit_sg(void) 1581 { 1582 #ifdef CONFIG_SCSI_PROC_FS 1583 sg_proc_cleanup(); 1584 #endif /* CONFIG_SCSI_PROC_FS */ 1585 scsi_unregister_interface(&sg_interface); 1586 class_destroy(sg_sysfs_class); 1587 sg_sysfs_valid = 0; 1588 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1589 SG_MAX_DEVS); 1590 kfree((char *)sg_dev_arr); 1591 sg_dev_arr = NULL; 1592 sg_dev_max = 0; 1593 } 1594 1595 static int 1596 sg_start_req(Sg_request * srp) 1597 { 1598 int res; 1599 Sg_fd *sfp = srp->parentfp; 1600 sg_io_hdr_t *hp = &srp->header; 1601 int dxfer_len = (int) hp->dxfer_len; 1602 int dxfer_dir = hp->dxfer_direction; 1603 Sg_scatter_hold *req_schp = &srp->data; 1604 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1605 1606 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); 1607 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1608 return 0; 1609 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && 1610 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && 1611 (!sfp->parentdp->device->host->unchecked_isa_dma)) { 1612 res = sg_build_direct(srp, sfp, dxfer_len); 1613 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ 1614 return res; 1615 } 1616 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) 1617 sg_link_reserve(sfp, srp, dxfer_len); 1618 else { 1619 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1620 if (res) { 1621 sg_remove_scat(req_schp); 1622 return res; 1623 } 1624 } 1625 return 0; 1626 } 1627 1628 static void 1629 sg_finish_rem_req(Sg_request * srp) 1630 { 1631 Sg_fd *sfp = srp->parentfp; 1632 Sg_scatter_hold *req_schp = &srp->data; 1633 1634 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1635 if (srp->res_used) 1636 sg_unlink_reserve(sfp, srp); 1637 else 1638 sg_remove_scat(req_schp); 1639 sg_remove_request(sfp, srp); 1640 } 1641 1642 static int 1643 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1644 { 1645 int sg_bufflen = tablesize * sizeof(struct scatterlist); 1646 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1647 1648 /* 1649 * TODO: test without low_dma, we should not need it since 1650 * the block layer will bounce the buffer for us 1651 * 1652 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list. 1653 */ 1654 if (sfp->low_dma) 1655 gfp_flags |= GFP_DMA; 1656 schp->buffer = kzalloc(sg_bufflen, gfp_flags); 1657 if (!schp->buffer) 1658 return -ENOMEM; 1659 schp->sglist_len = sg_bufflen; 1660 return tablesize; /* number of scat_gath elements allocated */ 1661 } 1662 1663 #ifdef SG_ALLOW_DIO_CODE 1664 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ 1665 /* TODO: hopefully we can use the generic block layer code */ 1666 1667 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if 1668 - mapping of all pages not successful 1669 (i.e., either completely successful or fails) 1670 */ 1671 static int 1672 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, 1673 unsigned long uaddr, size_t count, int rw) 1674 { 1675 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 1676 unsigned long start = uaddr >> PAGE_SHIFT; 1677 const int nr_pages = end - start; 1678 int res, i, j; 1679 struct page **pages; 1680 1681 /* User attempted Overflow! */ 1682 if ((uaddr + count) < uaddr) 1683 return -EINVAL; 1684 1685 /* Too big */ 1686 if (nr_pages > max_pages) 1687 return -ENOMEM; 1688 1689 /* Hmm? */ 1690 if (count == 0) 1691 return 0; 1692 1693 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) 1694 return -ENOMEM; 1695 1696 /* Try to fault in all of the necessary pages */ 1697 down_read(¤t->mm->mmap_sem); 1698 /* rw==READ means read from drive, write into memory area */ 1699 res = get_user_pages( 1700 current, 1701 current->mm, 1702 uaddr, 1703 nr_pages, 1704 rw == READ, 1705 0, /* don't force */ 1706 pages, 1707 NULL); 1708 up_read(¤t->mm->mmap_sem); 1709 1710 /* Errors and no page mapped should return here */ 1711 if (res < nr_pages) 1712 goto out_unmap; 1713 1714 for (i=0; i < nr_pages; i++) { 1715 /* FIXME: flush superflous for rw==READ, 1716 * probably wrong function for rw==WRITE 1717 */ 1718 flush_dcache_page(pages[i]); 1719 /* ?? Is locking needed? I don't think so */ 1720 /* if (TestSetPageLocked(pages[i])) 1721 goto out_unlock; */ 1722 } 1723 1724 sgl[0].page = pages[0]; 1725 sgl[0].offset = uaddr & ~PAGE_MASK; 1726 if (nr_pages > 1) { 1727 sgl[0].length = PAGE_SIZE - sgl[0].offset; 1728 count -= sgl[0].length; 1729 for (i=1; i < nr_pages ; i++) { 1730 sgl[i].page = pages[i]; 1731 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; 1732 count -= PAGE_SIZE; 1733 } 1734 } 1735 else { 1736 sgl[0].length = count; 1737 } 1738 1739 kfree(pages); 1740 return nr_pages; 1741 1742 out_unmap: 1743 if (res > 0) { 1744 for (j=0; j < res; j++) 1745 page_cache_release(pages[j]); 1746 res = 0; 1747 } 1748 kfree(pages); 1749 return res; 1750 } 1751 1752 1753 /* And unmap them... */ 1754 static int 1755 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, 1756 int dirtied) 1757 { 1758 int i; 1759 1760 for (i=0; i < nr_pages; i++) { 1761 struct page *page = sgl[i].page; 1762 1763 if (dirtied) 1764 SetPageDirty(page); 1765 /* unlock_page(page); */ 1766 /* FIXME: cache flush missing for rw==READ 1767 * FIXME: call the correct reference counting function 1768 */ 1769 page_cache_release(page); 1770 } 1771 1772 return 0; 1773 } 1774 1775 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ 1776 #endif 1777 1778 1779 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ 1780 static int 1781 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) 1782 { 1783 #ifdef SG_ALLOW_DIO_CODE 1784 sg_io_hdr_t *hp = &srp->header; 1785 Sg_scatter_hold *schp = &srp->data; 1786 int sg_tablesize = sfp->parentdp->sg_tablesize; 1787 int mx_sc_elems, res; 1788 struct scsi_device *sdev = sfp->parentdp->device; 1789 1790 if (((unsigned long)hp->dxferp & 1791 queue_dma_alignment(sdev->request_queue)) != 0) 1792 return 1; 1793 1794 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1795 if (mx_sc_elems <= 0) { 1796 return 1; 1797 } 1798 res = st_map_user_pages(schp->buffer, mx_sc_elems, 1799 (unsigned long)hp->dxferp, dxfer_len, 1800 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0); 1801 if (res <= 0) 1802 return 1; 1803 schp->k_use_sg = res; 1804 schp->dio_in_use = 1; 1805 hp->info |= SG_INFO_DIRECT_IO; 1806 return 0; 1807 #else 1808 return 1; 1809 #endif 1810 } 1811 1812 static int 1813 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1814 { 1815 struct scatterlist *sg; 1816 int ret_sz = 0, k, rem_sz, num, mx_sc_elems; 1817 int sg_tablesize = sfp->parentdp->sg_tablesize; 1818 int blk_size = buff_size; 1819 struct page *p = NULL; 1820 1821 if ((blk_size < 0) || (!sfp)) 1822 return -EFAULT; 1823 if (0 == blk_size) 1824 ++blk_size; /* don't know why */ 1825 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1826 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); 1827 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1828 buff_size, blk_size)); 1829 1830 /* N.B. ret_sz carried into this block ... */ 1831 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1832 if (mx_sc_elems < 0) 1833 return mx_sc_elems; /* most likely -ENOMEM */ 1834 1835 for (k = 0, sg = schp->buffer, rem_sz = blk_size; 1836 (rem_sz > 0) && (k < mx_sc_elems); 1837 ++k, rem_sz -= ret_sz, ++sg) { 1838 1839 num = (rem_sz > SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz; 1840 p = sg_page_malloc(num, sfp->low_dma, &ret_sz); 1841 if (!p) 1842 return -ENOMEM; 1843 1844 sg->page = p; 1845 sg->length = ret_sz; 1846 1847 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n", 1848 k, p, ret_sz)); 1849 } /* end of for loop */ 1850 1851 schp->k_use_sg = k; 1852 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz)); 1853 1854 schp->bufflen = blk_size; 1855 if (rem_sz > 0) /* must have failed */ 1856 return -ENOMEM; 1857 1858 return 0; 1859 } 1860 1861 static int 1862 sg_write_xfer(Sg_request * srp) 1863 { 1864 sg_io_hdr_t *hp = &srp->header; 1865 Sg_scatter_hold *schp = &srp->data; 1866 struct scatterlist *sg = schp->buffer; 1867 int num_xfer = 0; 1868 int j, k, onum, usglen, ksglen, res; 1869 int iovec_count = (int) hp->iovec_count; 1870 int dxfer_dir = hp->dxfer_direction; 1871 unsigned char *p; 1872 unsigned char __user *up; 1873 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 1874 1875 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || 1876 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 1877 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); 1878 if (schp->bufflen < num_xfer) 1879 num_xfer = schp->bufflen; 1880 } 1881 if ((num_xfer <= 0) || (schp->dio_in_use) || 1882 (new_interface 1883 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 1884 return 0; 1885 1886 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 1887 num_xfer, iovec_count, schp->k_use_sg)); 1888 if (iovec_count) { 1889 onum = iovec_count; 1890 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 1891 return -EFAULT; 1892 } else 1893 onum = 1; 1894 1895 ksglen = sg->length; 1896 p = page_address(sg->page); 1897 for (j = 0, k = 0; j < onum; ++j) { 1898 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); 1899 if (res) 1900 return res; 1901 1902 for (; p; ++sg, ksglen = sg->length, 1903 p = page_address(sg->page)) { 1904 if (usglen <= 0) 1905 break; 1906 if (ksglen > usglen) { 1907 if (usglen >= num_xfer) { 1908 if (__copy_from_user(p, up, num_xfer)) 1909 return -EFAULT; 1910 return 0; 1911 } 1912 if (__copy_from_user(p, up, usglen)) 1913 return -EFAULT; 1914 p += usglen; 1915 ksglen -= usglen; 1916 break; 1917 } else { 1918 if (ksglen >= num_xfer) { 1919 if (__copy_from_user(p, up, num_xfer)) 1920 return -EFAULT; 1921 return 0; 1922 } 1923 if (__copy_from_user(p, up, ksglen)) 1924 return -EFAULT; 1925 up += ksglen; 1926 usglen -= ksglen; 1927 } 1928 ++k; 1929 if (k >= schp->k_use_sg) 1930 return 0; 1931 } 1932 } 1933 1934 return 0; 1935 } 1936 1937 static int 1938 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 1939 int wr_xf, int *countp, unsigned char __user **up) 1940 { 1941 int num_xfer = (int) hp->dxfer_len; 1942 unsigned char __user *p = hp->dxferp; 1943 int count; 1944 1945 if (0 == sg_num) { 1946 if (wr_xf && ('\0' == hp->interface_id)) 1947 count = (int) hp->flags; /* holds "old" input_size */ 1948 else 1949 count = num_xfer; 1950 } else { 1951 sg_iovec_t iovec; 1952 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) 1953 return -EFAULT; 1954 p = iovec.iov_base; 1955 count = (int) iovec.iov_len; 1956 } 1957 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) 1958 return -EFAULT; 1959 if (up) 1960 *up = p; 1961 if (countp) 1962 *countp = count; 1963 return 0; 1964 } 1965 1966 static void 1967 sg_remove_scat(Sg_scatter_hold * schp) 1968 { 1969 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1970 if (schp->buffer && (schp->sglist_len > 0)) { 1971 struct scatterlist *sg = schp->buffer; 1972 1973 if (schp->dio_in_use) { 1974 #ifdef SG_ALLOW_DIO_CODE 1975 st_unmap_user_pages(sg, schp->k_use_sg, TRUE); 1976 #endif 1977 } else { 1978 int k; 1979 1980 for (k = 0; (k < schp->k_use_sg) && sg->page; 1981 ++k, ++sg) { 1982 SCSI_LOG_TIMEOUT(5, printk( 1983 "sg_remove_scat: k=%d, a=0x%p, len=%d\n", 1984 k, sg->page, sg->length)); 1985 sg_page_free(sg->page, sg->length); 1986 } 1987 } 1988 kfree(schp->buffer); 1989 } 1990 memset(schp, 0, sizeof (*schp)); 1991 } 1992 1993 static int 1994 sg_read_xfer(Sg_request * srp) 1995 { 1996 sg_io_hdr_t *hp = &srp->header; 1997 Sg_scatter_hold *schp = &srp->data; 1998 struct scatterlist *sg = schp->buffer; 1999 int num_xfer = 0; 2000 int j, k, onum, usglen, ksglen, res; 2001 int iovec_count = (int) hp->iovec_count; 2002 int dxfer_dir = hp->dxfer_direction; 2003 unsigned char *p; 2004 unsigned char __user *up; 2005 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 2006 2007 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) 2008 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 2009 num_xfer = hp->dxfer_len; 2010 if (schp->bufflen < num_xfer) 2011 num_xfer = schp->bufflen; 2012 } 2013 if ((num_xfer <= 0) || (schp->dio_in_use) || 2014 (new_interface 2015 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 2016 return 0; 2017 2018 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 2019 num_xfer, iovec_count, schp->k_use_sg)); 2020 if (iovec_count) { 2021 onum = iovec_count; 2022 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 2023 return -EFAULT; 2024 } else 2025 onum = 1; 2026 2027 p = page_address(sg->page); 2028 ksglen = sg->length; 2029 for (j = 0, k = 0; j < onum; ++j) { 2030 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); 2031 if (res) 2032 return res; 2033 2034 for (; p; ++sg, ksglen = sg->length, 2035 p = page_address(sg->page)) { 2036 if (usglen <= 0) 2037 break; 2038 if (ksglen > usglen) { 2039 if (usglen >= num_xfer) { 2040 if (__copy_to_user(up, p, num_xfer)) 2041 return -EFAULT; 2042 return 0; 2043 } 2044 if (__copy_to_user(up, p, usglen)) 2045 return -EFAULT; 2046 p += usglen; 2047 ksglen -= usglen; 2048 break; 2049 } else { 2050 if (ksglen >= num_xfer) { 2051 if (__copy_to_user(up, p, num_xfer)) 2052 return -EFAULT; 2053 return 0; 2054 } 2055 if (__copy_to_user(up, p, ksglen)) 2056 return -EFAULT; 2057 up += ksglen; 2058 usglen -= ksglen; 2059 } 2060 ++k; 2061 if (k >= schp->k_use_sg) 2062 return 0; 2063 } 2064 } 2065 2066 return 0; 2067 } 2068 2069 static int 2070 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 2071 { 2072 Sg_scatter_hold *schp = &srp->data; 2073 struct scatterlist *sg = schp->buffer; 2074 int k, num; 2075 2076 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 2077 num_read_xfer)); 2078 if ((!outp) || (num_read_xfer <= 0)) 2079 return 0; 2080 2081 for (k = 0; (k < schp->k_use_sg) && sg->page; ++k, ++sg) { 2082 num = sg->length; 2083 if (num > num_read_xfer) { 2084 if (__copy_to_user(outp, page_address(sg->page), 2085 num_read_xfer)) 2086 return -EFAULT; 2087 break; 2088 } else { 2089 if (__copy_to_user(outp, page_address(sg->page), 2090 num)) 2091 return -EFAULT; 2092 num_read_xfer -= num; 2093 if (num_read_xfer <= 0) 2094 break; 2095 outp += num; 2096 } 2097 } 2098 2099 return 0; 2100 } 2101 2102 static void 2103 sg_build_reserve(Sg_fd * sfp, int req_size) 2104 { 2105 Sg_scatter_hold *schp = &sfp->reserve; 2106 2107 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 2108 do { 2109 if (req_size < PAGE_SIZE) 2110 req_size = PAGE_SIZE; 2111 if (0 == sg_build_indirect(schp, sfp, req_size)) 2112 return; 2113 else 2114 sg_remove_scat(schp); 2115 req_size >>= 1; /* divide by 2 */ 2116 } while (req_size > (PAGE_SIZE / 2)); 2117 } 2118 2119 static void 2120 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 2121 { 2122 Sg_scatter_hold *req_schp = &srp->data; 2123 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2124 struct scatterlist *sg = rsv_schp->buffer; 2125 int k, num, rem; 2126 2127 srp->res_used = 1; 2128 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 2129 rem = size; 2130 2131 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sg) { 2132 num = sg->length; 2133 if (rem <= num) { 2134 sfp->save_scat_len = num; 2135 sg->length = rem; 2136 req_schp->k_use_sg = k + 1; 2137 req_schp->sglist_len = rsv_schp->sglist_len; 2138 req_schp->buffer = rsv_schp->buffer; 2139 2140 req_schp->bufflen = size; 2141 req_schp->b_malloc_len = rsv_schp->b_malloc_len; 2142 break; 2143 } else 2144 rem -= num; 2145 } 2146 2147 if (k >= rsv_schp->k_use_sg) 2148 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 2149 } 2150 2151 static void 2152 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 2153 { 2154 Sg_scatter_hold *req_schp = &srp->data; 2155 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2156 2157 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 2158 (int) req_schp->k_use_sg)); 2159 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { 2160 struct scatterlist *sg = rsv_schp->buffer; 2161 2162 if (sfp->save_scat_len > 0) 2163 (sg + (req_schp->k_use_sg - 1))->length = 2164 (unsigned) sfp->save_scat_len; 2165 else 2166 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); 2167 } 2168 req_schp->k_use_sg = 0; 2169 req_schp->bufflen = 0; 2170 req_schp->buffer = NULL; 2171 req_schp->sglist_len = 0; 2172 sfp->save_scat_len = 0; 2173 srp->res_used = 0; 2174 } 2175 2176 static Sg_request * 2177 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 2178 { 2179 Sg_request *resp; 2180 unsigned long iflags; 2181 2182 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2183 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 2184 /* look for requests that are ready + not SG_IO owned */ 2185 if ((1 == resp->done) && (!resp->sg_io_owned) && 2186 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 2187 resp->done = 2; /* guard against other readers */ 2188 break; 2189 } 2190 } 2191 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2192 return resp; 2193 } 2194 2195 #ifdef CONFIG_SCSI_PROC_FS 2196 static Sg_request * 2197 sg_get_nth_request(Sg_fd * sfp, int nth) 2198 { 2199 Sg_request *resp; 2200 unsigned long iflags; 2201 int k; 2202 2203 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2204 for (k = 0, resp = sfp->headrp; resp && (k < nth); 2205 ++k, resp = resp->nextrp) ; 2206 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2207 return resp; 2208 } 2209 #endif 2210 2211 /* always adds to end of list */ 2212 static Sg_request * 2213 sg_add_request(Sg_fd * sfp) 2214 { 2215 int k; 2216 unsigned long iflags; 2217 Sg_request *resp; 2218 Sg_request *rp = sfp->req_arr; 2219 2220 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2221 resp = sfp->headrp; 2222 if (!resp) { 2223 memset(rp, 0, sizeof (Sg_request)); 2224 rp->parentfp = sfp; 2225 resp = rp; 2226 sfp->headrp = resp; 2227 } else { 2228 if (0 == sfp->cmd_q) 2229 resp = NULL; /* command queuing disallowed */ 2230 else { 2231 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2232 if (!rp->parentfp) 2233 break; 2234 } 2235 if (k < SG_MAX_QUEUE) { 2236 memset(rp, 0, sizeof (Sg_request)); 2237 rp->parentfp = sfp; 2238 while (resp->nextrp) 2239 resp = resp->nextrp; 2240 resp->nextrp = rp; 2241 resp = rp; 2242 } else 2243 resp = NULL; 2244 } 2245 } 2246 if (resp) { 2247 resp->nextrp = NULL; 2248 resp->header.duration = jiffies_to_msecs(jiffies); 2249 } 2250 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2251 return resp; 2252 } 2253 2254 /* Return of 1 for found; 0 for not found */ 2255 static int 2256 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2257 { 2258 Sg_request *prev_rp; 2259 Sg_request *rp; 2260 unsigned long iflags; 2261 int res = 0; 2262 2263 if ((!sfp) || (!srp) || (!sfp->headrp)) 2264 return res; 2265 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2266 prev_rp = sfp->headrp; 2267 if (srp == prev_rp) { 2268 sfp->headrp = prev_rp->nextrp; 2269 prev_rp->parentfp = NULL; 2270 res = 1; 2271 } else { 2272 while ((rp = prev_rp->nextrp)) { 2273 if (srp == rp) { 2274 prev_rp->nextrp = rp->nextrp; 2275 rp->parentfp = NULL; 2276 res = 1; 2277 break; 2278 } 2279 prev_rp = rp; 2280 } 2281 } 2282 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2283 return res; 2284 } 2285 2286 #ifdef CONFIG_SCSI_PROC_FS 2287 static Sg_fd * 2288 sg_get_nth_sfp(Sg_device * sdp, int nth) 2289 { 2290 Sg_fd *resp; 2291 unsigned long iflags; 2292 int k; 2293 2294 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2295 for (k = 0, resp = sdp->headfp; resp && (k < nth); 2296 ++k, resp = resp->nextfp) ; 2297 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2298 return resp; 2299 } 2300 #endif 2301 2302 static Sg_fd * 2303 sg_add_sfp(Sg_device * sdp, int dev) 2304 { 2305 Sg_fd *sfp; 2306 unsigned long iflags; 2307 2308 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2309 if (!sfp) 2310 return NULL; 2311 2312 init_waitqueue_head(&sfp->read_wait); 2313 rwlock_init(&sfp->rq_list_lock); 2314 2315 sfp->timeout = SG_DEFAULT_TIMEOUT; 2316 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2317 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2318 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2319 sdp->device->host->unchecked_isa_dma : 1; 2320 sfp->cmd_q = SG_DEF_COMMAND_Q; 2321 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2322 sfp->parentdp = sdp; 2323 write_lock_irqsave(&sg_dev_arr_lock, iflags); 2324 if (!sdp->headfp) 2325 sdp->headfp = sfp; 2326 else { /* add to tail of existing list */ 2327 Sg_fd *pfp = sdp->headfp; 2328 while (pfp->nextfp) 2329 pfp = pfp->nextfp; 2330 pfp->nextfp = sfp; 2331 } 2332 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2333 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2334 sg_build_reserve(sfp, sg_big_buff); 2335 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2336 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2337 return sfp; 2338 } 2339 2340 static void 2341 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2342 { 2343 Sg_fd *fp; 2344 Sg_fd *prev_fp; 2345 2346 prev_fp = sdp->headfp; 2347 if (sfp == prev_fp) 2348 sdp->headfp = prev_fp->nextfp; 2349 else { 2350 while ((fp = prev_fp->nextfp)) { 2351 if (sfp == fp) { 2352 prev_fp->nextfp = fp->nextfp; 2353 break; 2354 } 2355 prev_fp = fp; 2356 } 2357 } 2358 if (sfp->reserve.bufflen > 0) { 2359 SCSI_LOG_TIMEOUT(6, 2360 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2361 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); 2362 sg_remove_scat(&sfp->reserve); 2363 } 2364 sfp->parentdp = NULL; 2365 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); 2366 kfree(sfp); 2367 } 2368 2369 /* Returns 0 in normal case, 1 when detached and sdp object removed */ 2370 static int 2371 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2372 { 2373 Sg_request *srp; 2374 Sg_request *tsrp; 2375 int dirty = 0; 2376 int res = 0; 2377 2378 for (srp = sfp->headrp; srp; srp = tsrp) { 2379 tsrp = srp->nextrp; 2380 if (sg_srp_done(srp, sfp)) 2381 sg_finish_rem_req(srp); 2382 else 2383 ++dirty; 2384 } 2385 if (0 == dirty) { 2386 unsigned long iflags; 2387 2388 write_lock_irqsave(&sg_dev_arr_lock, iflags); 2389 __sg_remove_sfp(sdp, sfp); 2390 if (sdp->detached && (NULL == sdp->headfp)) { 2391 int k, maxd; 2392 2393 maxd = sg_dev_max; 2394 for (k = 0; k < maxd; ++k) { 2395 if (sdp == sg_dev_arr[k]) 2396 break; 2397 } 2398 if (k < maxd) 2399 sg_dev_arr[k] = NULL; 2400 kfree((char *) sdp); 2401 res = 1; 2402 } 2403 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2404 } else { 2405 /* MOD_INC's to inhibit unloading sg and associated adapter driver */ 2406 /* only bump the access_count if we actually succeeded in 2407 * throwing another counter on the host module */ 2408 scsi_device_get(sdp->device); /* XXX: retval ignored? */ 2409 sfp->closed = 1; /* flag dirty state on this fd */ 2410 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", 2411 dirty)); 2412 } 2413 return res; 2414 } 2415 2416 static int 2417 sg_res_in_use(Sg_fd * sfp) 2418 { 2419 const Sg_request *srp; 2420 unsigned long iflags; 2421 2422 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2423 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2424 if (srp->res_used) 2425 break; 2426 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2427 return srp ? 1 : 0; 2428 } 2429 2430 /* If retSzp==NULL want exact size or fail */ 2431 static struct page * 2432 sg_page_malloc(int rqSz, int lowDma, int *retSzp) 2433 { 2434 struct page *resp = NULL; 2435 gfp_t page_mask; 2436 int order, a_size; 2437 int resSz = rqSz; 2438 2439 if (rqSz <= 0) 2440 return resp; 2441 2442 if (lowDma) 2443 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN; 2444 else 2445 page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 2446 2447 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; 2448 order++, a_size <<= 1) ; 2449 resp = alloc_pages(page_mask, order); 2450 while ((!resp) && order && retSzp) { 2451 --order; 2452 a_size >>= 1; /* divide by 2, until PAGE_SIZE */ 2453 resp = alloc_pages(page_mask, order); /* try half */ 2454 resSz = a_size; 2455 } 2456 if (resp) { 2457 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2458 memset(page_address(resp), 0, resSz); 2459 if (retSzp) 2460 *retSzp = resSz; 2461 } 2462 return resp; 2463 } 2464 2465 static void 2466 sg_page_free(struct page *page, int size) 2467 { 2468 int order, a_size; 2469 2470 if (!page) 2471 return; 2472 for (order = 0, a_size = PAGE_SIZE; a_size < size; 2473 order++, a_size <<= 1) ; 2474 __free_pages(page, order); 2475 } 2476 2477 #ifndef MAINTENANCE_IN_CMD 2478 #define MAINTENANCE_IN_CMD 0xa3 2479 #endif 2480 2481 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, 2482 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, 2483 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, 2484 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD 2485 }; 2486 2487 static int 2488 sg_allow_access(unsigned char opcode, char dev_type) 2489 { 2490 int k; 2491 2492 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */ 2493 return 1; 2494 for (k = 0; k < sizeof (allow_ops); ++k) { 2495 if (opcode == allow_ops[k]) 2496 return 1; 2497 } 2498 return 0; 2499 } 2500 2501 #ifdef CONFIG_SCSI_PROC_FS 2502 static int 2503 sg_last_dev(void) 2504 { 2505 int k; 2506 unsigned long iflags; 2507 2508 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2509 for (k = sg_dev_max - 1; k >= 0; --k) 2510 if (sg_dev_arr[k] && sg_dev_arr[k]->device) 2511 break; 2512 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2513 return k + 1; /* origin 1 */ 2514 } 2515 #endif 2516 2517 static Sg_device * 2518 sg_get_dev(int dev) 2519 { 2520 Sg_device *sdp = NULL; 2521 unsigned long iflags; 2522 2523 if (sg_dev_arr && (dev >= 0)) { 2524 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2525 if (dev < sg_dev_max) 2526 sdp = sg_dev_arr[dev]; 2527 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2528 } 2529 return sdp; 2530 } 2531 2532 #ifdef CONFIG_SCSI_PROC_FS 2533 2534 static struct proc_dir_entry *sg_proc_sgp = NULL; 2535 2536 static char sg_proc_sg_dirname[] = "scsi/sg"; 2537 2538 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2539 2540 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2541 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2542 size_t count, loff_t *off); 2543 static struct file_operations adio_fops = { 2544 /* .owner, .read and .llseek added in sg_proc_init() */ 2545 .open = sg_proc_single_open_adio, 2546 .write = sg_proc_write_adio, 2547 .release = single_release, 2548 }; 2549 2550 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2551 static ssize_t sg_proc_write_dressz(struct file *filp, 2552 const char __user *buffer, size_t count, loff_t *off); 2553 static struct file_operations dressz_fops = { 2554 .open = sg_proc_single_open_dressz, 2555 .write = sg_proc_write_dressz, 2556 .release = single_release, 2557 }; 2558 2559 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2560 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2561 static struct file_operations version_fops = { 2562 .open = sg_proc_single_open_version, 2563 .release = single_release, 2564 }; 2565 2566 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2567 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2568 static struct file_operations devhdr_fops = { 2569 .open = sg_proc_single_open_devhdr, 2570 .release = single_release, 2571 }; 2572 2573 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2574 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2575 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2576 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2577 static void dev_seq_stop(struct seq_file *s, void *v); 2578 static struct file_operations dev_fops = { 2579 .open = sg_proc_open_dev, 2580 .release = seq_release, 2581 }; 2582 static struct seq_operations dev_seq_ops = { 2583 .start = dev_seq_start, 2584 .next = dev_seq_next, 2585 .stop = dev_seq_stop, 2586 .show = sg_proc_seq_show_dev, 2587 }; 2588 2589 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2590 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2591 static struct file_operations devstrs_fops = { 2592 .open = sg_proc_open_devstrs, 2593 .release = seq_release, 2594 }; 2595 static struct seq_operations devstrs_seq_ops = { 2596 .start = dev_seq_start, 2597 .next = dev_seq_next, 2598 .stop = dev_seq_stop, 2599 .show = sg_proc_seq_show_devstrs, 2600 }; 2601 2602 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2603 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2604 static struct file_operations debug_fops = { 2605 .open = sg_proc_open_debug, 2606 .release = seq_release, 2607 }; 2608 static struct seq_operations debug_seq_ops = { 2609 .start = dev_seq_start, 2610 .next = dev_seq_next, 2611 .stop = dev_seq_stop, 2612 .show = sg_proc_seq_show_debug, 2613 }; 2614 2615 2616 struct sg_proc_leaf { 2617 const char * name; 2618 struct file_operations * fops; 2619 }; 2620 2621 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2622 {"allow_dio", &adio_fops}, 2623 {"debug", &debug_fops}, 2624 {"def_reserved_size", &dressz_fops}, 2625 {"device_hdr", &devhdr_fops}, 2626 {"devices", &dev_fops}, 2627 {"device_strs", &devstrs_fops}, 2628 {"version", &version_fops} 2629 }; 2630 2631 static int 2632 sg_proc_init(void) 2633 { 2634 int k, mask; 2635 int num_leaves = 2636 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); 2637 struct proc_dir_entry *pdep; 2638 struct sg_proc_leaf * leaf; 2639 2640 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2641 if (!sg_proc_sgp) 2642 return 1; 2643 for (k = 0; k < num_leaves; ++k) { 2644 leaf = &sg_proc_leaf_arr[k]; 2645 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2646 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp); 2647 if (pdep) { 2648 leaf->fops->owner = THIS_MODULE, 2649 leaf->fops->read = seq_read, 2650 leaf->fops->llseek = seq_lseek, 2651 pdep->proc_fops = leaf->fops; 2652 } 2653 } 2654 return 0; 2655 } 2656 2657 static void 2658 sg_proc_cleanup(void) 2659 { 2660 int k; 2661 int num_leaves = 2662 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); 2663 2664 if (!sg_proc_sgp) 2665 return; 2666 for (k = 0; k < num_leaves; ++k) 2667 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2668 remove_proc_entry(sg_proc_sg_dirname, NULL); 2669 } 2670 2671 2672 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2673 { 2674 seq_printf(s, "%d\n", *((int *)s->private)); 2675 return 0; 2676 } 2677 2678 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2679 { 2680 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2681 } 2682 2683 static ssize_t 2684 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2685 size_t count, loff_t *off) 2686 { 2687 int num; 2688 char buff[11]; 2689 2690 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2691 return -EACCES; 2692 num = (count < 10) ? count : 10; 2693 if (copy_from_user(buff, buffer, num)) 2694 return -EFAULT; 2695 buff[num] = '\0'; 2696 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2697 return count; 2698 } 2699 2700 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2701 { 2702 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2703 } 2704 2705 static ssize_t 2706 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2707 size_t count, loff_t *off) 2708 { 2709 int num; 2710 unsigned long k = ULONG_MAX; 2711 char buff[11]; 2712 2713 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2714 return -EACCES; 2715 num = (count < 10) ? count : 10; 2716 if (copy_from_user(buff, buffer, num)) 2717 return -EFAULT; 2718 buff[num] = '\0'; 2719 k = simple_strtoul(buff, NULL, 10); 2720 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2721 sg_big_buff = k; 2722 return count; 2723 } 2724 return -ERANGE; 2725 } 2726 2727 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2728 { 2729 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2730 sg_version_date); 2731 return 0; 2732 } 2733 2734 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2735 { 2736 return single_open(file, sg_proc_seq_show_version, NULL); 2737 } 2738 2739 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2740 { 2741 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2742 "online\n"); 2743 return 0; 2744 } 2745 2746 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2747 { 2748 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2749 } 2750 2751 struct sg_proc_deviter { 2752 loff_t index; 2753 size_t max; 2754 }; 2755 2756 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2757 { 2758 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2759 2760 s->private = it; 2761 if (! it) 2762 return NULL; 2763 2764 if (NULL == sg_dev_arr) 2765 return NULL; 2766 it->index = *pos; 2767 it->max = sg_last_dev(); 2768 if (it->index >= it->max) 2769 return NULL; 2770 return it; 2771 } 2772 2773 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2774 { 2775 struct sg_proc_deviter * it = s->private; 2776 2777 *pos = ++it->index; 2778 return (it->index < it->max) ? it : NULL; 2779 } 2780 2781 static void dev_seq_stop(struct seq_file *s, void *v) 2782 { 2783 kfree(s->private); 2784 } 2785 2786 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2787 { 2788 return seq_open(file, &dev_seq_ops); 2789 } 2790 2791 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2792 { 2793 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2794 Sg_device *sdp; 2795 struct scsi_device *scsidp; 2796 2797 sdp = it ? sg_get_dev(it->index) : NULL; 2798 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2799 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2800 scsidp->host->host_no, scsidp->channel, 2801 scsidp->id, scsidp->lun, (int) scsidp->type, 2802 1, 2803 (int) scsidp->queue_depth, 2804 (int) scsidp->device_busy, 2805 (int) scsi_device_online(scsidp)); 2806 else 2807 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2808 return 0; 2809 } 2810 2811 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2812 { 2813 return seq_open(file, &devstrs_seq_ops); 2814 } 2815 2816 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2817 { 2818 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2819 Sg_device *sdp; 2820 struct scsi_device *scsidp; 2821 2822 sdp = it ? sg_get_dev(it->index) : NULL; 2823 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2824 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2825 scsidp->vendor, scsidp->model, scsidp->rev); 2826 else 2827 seq_printf(s, "<no active device>\n"); 2828 return 0; 2829 } 2830 2831 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2832 { 2833 int k, m, new_interface, blen, usg; 2834 Sg_request *srp; 2835 Sg_fd *fp; 2836 const sg_io_hdr_t *hp; 2837 const char * cp; 2838 unsigned int ms; 2839 2840 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { 2841 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2842 "(res)sgat=%d low_dma=%d\n", k + 1, 2843 jiffies_to_msecs(fp->timeout), 2844 fp->reserve.bufflen, 2845 (int) fp->reserve.k_use_sg, 2846 (int) fp->low_dma); 2847 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2848 (int) fp->cmd_q, (int) fp->force_packid, 2849 (int) fp->keep_orphan, (int) fp->closed); 2850 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { 2851 hp = &srp->header; 2852 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2853 if (srp->res_used) { 2854 if (new_interface && 2855 (SG_FLAG_MMAP_IO & hp->flags)) 2856 cp = " mmap>> "; 2857 else 2858 cp = " rb>> "; 2859 } else { 2860 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2861 cp = " dio>> "; 2862 else 2863 cp = " "; 2864 } 2865 seq_printf(s, cp); 2866 blen = srp->data.bufflen; 2867 usg = srp->data.k_use_sg; 2868 seq_printf(s, srp->done ? 2869 ((1 == srp->done) ? "rcv:" : "fin:") 2870 : "act:"); 2871 seq_printf(s, " id=%d blen=%d", 2872 srp->header.pack_id, blen); 2873 if (srp->done) 2874 seq_printf(s, " dur=%d", hp->duration); 2875 else { 2876 ms = jiffies_to_msecs(jiffies); 2877 seq_printf(s, " t_o/elap=%d/%d", 2878 (new_interface ? hp->timeout : 2879 jiffies_to_msecs(fp->timeout)), 2880 (ms > hp->duration ? ms - hp->duration : 0)); 2881 } 2882 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2883 (int) srp->data.cmd_opcode); 2884 } 2885 if (0 == m) 2886 seq_printf(s, " No requests active\n"); 2887 } 2888 } 2889 2890 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2891 { 2892 return seq_open(file, &debug_seq_ops); 2893 } 2894 2895 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2896 { 2897 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2898 Sg_device *sdp; 2899 2900 if (it && (0 == it->index)) { 2901 seq_printf(s, "dev_max(currently)=%d max_active_device=%d " 2902 "(origin 1)\n", sg_dev_max, (int)it->max); 2903 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2904 } 2905 sdp = it ? sg_get_dev(it->index) : NULL; 2906 if (sdp) { 2907 struct scsi_device *scsidp = sdp->device; 2908 2909 if (NULL == scsidp) { 2910 seq_printf(s, "device %d detached ??\n", 2911 (int)it->index); 2912 return 0; 2913 } 2914 2915 if (sg_get_nth_sfp(sdp, 0)) { 2916 seq_printf(s, " >>> device=%s ", 2917 sdp->disk->disk_name); 2918 if (sdp->detached) 2919 seq_printf(s, "detached pending close "); 2920 else 2921 seq_printf 2922 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2923 scsidp->host->host_no, 2924 scsidp->channel, scsidp->id, 2925 scsidp->lun, 2926 scsidp->host->hostt->emulated); 2927 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2928 sdp->sg_tablesize, sdp->exclude); 2929 } 2930 sg_proc_debug_helper(s, sdp); 2931 } 2932 return 0; 2933 } 2934 2935 #endif /* CONFIG_SCSI_PROC_FS */ 2936 2937 module_init(init_sg); 2938 module_exit(exit_sg); 2939