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 sg_finish_rem_req(srp); 752 return -ENOMEM; 753 } else 754 return 0; 755 } 756 757 static int 758 sg_srp_done(Sg_request *srp, Sg_fd *sfp) 759 { 760 unsigned long iflags; 761 int done; 762 763 read_lock_irqsave(&sfp->rq_list_lock, iflags); 764 done = srp->done; 765 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 766 return done; 767 } 768 769 static int 770 sg_ioctl(struct inode *inode, struct file *filp, 771 unsigned int cmd_in, unsigned long arg) 772 { 773 void __user *p = (void __user *)arg; 774 int __user *ip = p; 775 int result, val, read_only; 776 Sg_device *sdp; 777 Sg_fd *sfp; 778 Sg_request *srp; 779 unsigned long iflags; 780 781 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 782 return -ENXIO; 783 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 784 sdp->disk->disk_name, (int) cmd_in)); 785 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 786 787 switch (cmd_in) { 788 case SG_IO: 789 { 790 int blocking = 1; /* ignore O_NONBLOCK flag */ 791 792 if (sdp->detached) 793 return -ENODEV; 794 if (!scsi_block_when_processing_errors(sdp->device)) 795 return -ENXIO; 796 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 797 return -EFAULT; 798 result = 799 sg_new_write(sfp, p, SZ_SG_IO_HDR, 800 blocking, read_only, &srp); 801 if (result < 0) 802 return result; 803 srp->sg_io_owned = 1; 804 while (1) { 805 result = 0; /* following macro to beat race condition */ 806 __wait_event_interruptible(sfp->read_wait, 807 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), 808 result); 809 if (sdp->detached) 810 return -ENODEV; 811 if (sfp->closed) 812 return 0; /* request packet dropped already */ 813 if (0 == result) 814 break; 815 srp->orphan = 1; 816 return result; /* -ERESTARTSYS because signal hit process */ 817 } 818 write_lock_irqsave(&sfp->rq_list_lock, iflags); 819 srp->done = 2; 820 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 821 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 822 return (result < 0) ? result : 0; 823 } 824 case SG_SET_TIMEOUT: 825 result = get_user(val, ip); 826 if (result) 827 return result; 828 if (val < 0) 829 return -EIO; 830 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 831 val = MULDIV (INT_MAX, USER_HZ, HZ); 832 sfp->timeout_user = val; 833 sfp->timeout = MULDIV (val, HZ, USER_HZ); 834 835 return 0; 836 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 837 /* strange ..., for backward compatibility */ 838 return sfp->timeout_user; 839 case SG_SET_FORCE_LOW_DMA: 840 result = get_user(val, ip); 841 if (result) 842 return result; 843 if (val) { 844 sfp->low_dma = 1; 845 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 846 val = (int) sfp->reserve.bufflen; 847 sg_remove_scat(&sfp->reserve); 848 sg_build_reserve(sfp, val); 849 } 850 } else { 851 if (sdp->detached) 852 return -ENODEV; 853 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 854 } 855 return 0; 856 case SG_GET_LOW_DMA: 857 return put_user((int) sfp->low_dma, ip); 858 case SG_GET_SCSI_ID: 859 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 860 return -EFAULT; 861 else { 862 sg_scsi_id_t __user *sg_idp = p; 863 864 if (sdp->detached) 865 return -ENODEV; 866 __put_user((int) sdp->device->host->host_no, 867 &sg_idp->host_no); 868 __put_user((int) sdp->device->channel, 869 &sg_idp->channel); 870 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 871 __put_user((int) sdp->device->lun, &sg_idp->lun); 872 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 873 __put_user((short) sdp->device->host->cmd_per_lun, 874 &sg_idp->h_cmd_per_lun); 875 __put_user((short) sdp->device->queue_depth, 876 &sg_idp->d_queue_depth); 877 __put_user(0, &sg_idp->unused[0]); 878 __put_user(0, &sg_idp->unused[1]); 879 return 0; 880 } 881 case SG_SET_FORCE_PACK_ID: 882 result = get_user(val, ip); 883 if (result) 884 return result; 885 sfp->force_packid = val ? 1 : 0; 886 return 0; 887 case SG_GET_PACK_ID: 888 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 889 return -EFAULT; 890 read_lock_irqsave(&sfp->rq_list_lock, iflags); 891 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 892 if ((1 == srp->done) && (!srp->sg_io_owned)) { 893 read_unlock_irqrestore(&sfp->rq_list_lock, 894 iflags); 895 __put_user(srp->header.pack_id, ip); 896 return 0; 897 } 898 } 899 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 900 __put_user(-1, ip); 901 return 0; 902 case SG_GET_NUM_WAITING: 903 read_lock_irqsave(&sfp->rq_list_lock, iflags); 904 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 905 if ((1 == srp->done) && (!srp->sg_io_owned)) 906 ++val; 907 } 908 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 909 return put_user(val, ip); 910 case SG_GET_SG_TABLESIZE: 911 return put_user(sdp->sg_tablesize, ip); 912 case SG_SET_RESERVED_SIZE: 913 result = get_user(val, ip); 914 if (result) 915 return result; 916 if (val < 0) 917 return -EINVAL; 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 = (int) sfp->reserve.bufflen; 927 return put_user(val, ip); 928 case SG_SET_COMMAND_Q: 929 result = get_user(val, ip); 930 if (result) 931 return result; 932 sfp->cmd_q = val ? 1 : 0; 933 return 0; 934 case SG_GET_COMMAND_Q: 935 return put_user((int) sfp->cmd_q, ip); 936 case SG_SET_KEEP_ORPHAN: 937 result = get_user(val, ip); 938 if (result) 939 return result; 940 sfp->keep_orphan = val; 941 return 0; 942 case SG_GET_KEEP_ORPHAN: 943 return put_user((int) sfp->keep_orphan, ip); 944 case SG_NEXT_CMD_LEN: 945 result = get_user(val, ip); 946 if (result) 947 return result; 948 sfp->next_cmd_len = (val > 0) ? val : 0; 949 return 0; 950 case SG_GET_VERSION_NUM: 951 return put_user(sg_version_num, ip); 952 case SG_GET_ACCESS_COUNT: 953 /* faked - we don't have a real access count anymore */ 954 val = (sdp->device ? 1 : 0); 955 return put_user(val, ip); 956 case SG_GET_REQUEST_TABLE: 957 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 958 return -EFAULT; 959 else { 960 sg_req_info_t *rinfo; 961 unsigned int ms; 962 963 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 964 GFP_KERNEL); 965 if (!rinfo) 966 return -ENOMEM; 967 read_lock_irqsave(&sfp->rq_list_lock, iflags); 968 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 969 ++val, srp = srp ? srp->nextrp : srp) { 970 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 971 if (srp) { 972 rinfo[val].req_state = srp->done + 1; 973 rinfo[val].problem = 974 srp->header.masked_status & 975 srp->header.host_status & 976 srp->header.driver_status; 977 if (srp->done) 978 rinfo[val].duration = 979 srp->header.duration; 980 else { 981 ms = jiffies_to_msecs(jiffies); 982 rinfo[val].duration = 983 (ms > srp->header.duration) ? 984 (ms - srp->header.duration) : 0; 985 } 986 rinfo[val].orphan = srp->orphan; 987 rinfo[val].sg_io_owned = 988 srp->sg_io_owned; 989 rinfo[val].pack_id = 990 srp->header.pack_id; 991 rinfo[val].usr_ptr = 992 srp->header.usr_ptr; 993 } 994 } 995 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 996 result = __copy_to_user(p, rinfo, 997 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 998 result = result ? -EFAULT : 0; 999 kfree(rinfo); 1000 return result; 1001 } 1002 case SG_EMULATED_HOST: 1003 if (sdp->detached) 1004 return -ENODEV; 1005 return put_user(sdp->device->host->hostt->emulated, ip); 1006 case SG_SCSI_RESET: 1007 if (sdp->detached) 1008 return -ENODEV; 1009 if (filp->f_flags & O_NONBLOCK) { 1010 if (scsi_host_in_recovery(sdp->device->host)) 1011 return -EBUSY; 1012 } else if (!scsi_block_when_processing_errors(sdp->device)) 1013 return -EBUSY; 1014 result = get_user(val, ip); 1015 if (result) 1016 return result; 1017 if (SG_SCSI_RESET_NOTHING == val) 1018 return 0; 1019 switch (val) { 1020 case SG_SCSI_RESET_DEVICE: 1021 val = SCSI_TRY_RESET_DEVICE; 1022 break; 1023 case SG_SCSI_RESET_BUS: 1024 val = SCSI_TRY_RESET_BUS; 1025 break; 1026 case SG_SCSI_RESET_HOST: 1027 val = SCSI_TRY_RESET_HOST; 1028 break; 1029 default: 1030 return -EINVAL; 1031 } 1032 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1033 return -EACCES; 1034 return (scsi_reset_provider(sdp->device, val) == 1035 SUCCESS) ? 0 : -EIO; 1036 case SCSI_IOCTL_SEND_COMMAND: 1037 if (sdp->detached) 1038 return -ENODEV; 1039 if (read_only) { 1040 unsigned char opcode = WRITE_6; 1041 Scsi_Ioctl_Command __user *siocp = p; 1042 1043 if (copy_from_user(&opcode, siocp->data, 1)) 1044 return -EFAULT; 1045 if (!sg_allow_access(opcode, sdp->device->type)) 1046 return -EPERM; 1047 } 1048 return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p); 1049 case SG_SET_DEBUG: 1050 result = get_user(val, ip); 1051 if (result) 1052 return result; 1053 sdp->sgdebug = (char) val; 1054 return 0; 1055 case SCSI_IOCTL_GET_IDLUN: 1056 case SCSI_IOCTL_GET_BUS_NUMBER: 1057 case SCSI_IOCTL_PROBE_HOST: 1058 case SG_GET_TRANSFORM: 1059 if (sdp->detached) 1060 return -ENODEV; 1061 return scsi_ioctl(sdp->device, cmd_in, p); 1062 default: 1063 if (read_only) 1064 return -EPERM; /* don't know so take safe approach */ 1065 return scsi_ioctl(sdp->device, cmd_in, p); 1066 } 1067 } 1068 1069 #ifdef CONFIG_COMPAT 1070 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1071 { 1072 Sg_device *sdp; 1073 Sg_fd *sfp; 1074 struct scsi_device *sdev; 1075 1076 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1077 return -ENXIO; 1078 1079 sdev = sdp->device; 1080 if (sdev->host->hostt->compat_ioctl) { 1081 int ret; 1082 1083 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1084 1085 return ret; 1086 } 1087 1088 return -ENOIOCTLCMD; 1089 } 1090 #endif 1091 1092 static unsigned int 1093 sg_poll(struct file *filp, poll_table * wait) 1094 { 1095 unsigned int res = 0; 1096 Sg_device *sdp; 1097 Sg_fd *sfp; 1098 Sg_request *srp; 1099 int count = 0; 1100 unsigned long iflags; 1101 1102 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) 1103 || sfp->closed) 1104 return POLLERR; 1105 poll_wait(filp, &sfp->read_wait, wait); 1106 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1107 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1108 /* if any read waiting, flag it */ 1109 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1110 res = POLLIN | POLLRDNORM; 1111 ++count; 1112 } 1113 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1114 1115 if (sdp->detached) 1116 res |= POLLHUP; 1117 else if (!sfp->cmd_q) { 1118 if (0 == count) 1119 res |= POLLOUT | POLLWRNORM; 1120 } else if (count < SG_MAX_QUEUE) 1121 res |= POLLOUT | POLLWRNORM; 1122 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1123 sdp->disk->disk_name, (int) res)); 1124 return res; 1125 } 1126 1127 static int 1128 sg_fasync(int fd, struct file *filp, int mode) 1129 { 1130 int retval; 1131 Sg_device *sdp; 1132 Sg_fd *sfp; 1133 1134 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1135 return -ENXIO; 1136 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1137 sdp->disk->disk_name, mode)); 1138 1139 retval = fasync_helper(fd, filp, mode, &sfp->async_qp); 1140 return (retval < 0) ? retval : 0; 1141 } 1142 1143 static struct page * 1144 sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type) 1145 { 1146 Sg_fd *sfp; 1147 struct page *page = NOPAGE_SIGBUS; 1148 unsigned long offset, len, sa; 1149 Sg_scatter_hold *rsv_schp; 1150 struct scatterlist *sg; 1151 int k; 1152 1153 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1154 return page; 1155 rsv_schp = &sfp->reserve; 1156 offset = addr - vma->vm_start; 1157 if (offset >= rsv_schp->bufflen) 1158 return page; 1159 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n", 1160 offset, rsv_schp->k_use_sg)); 1161 sg = rsv_schp->buffer; 1162 sa = vma->vm_start; 1163 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1164 ++k, ++sg) { 1165 len = vma->vm_end - sa; 1166 len = (len < sg->length) ? len : sg->length; 1167 if (offset < len) { 1168 page = sg->page; 1169 get_page(page); /* increment page count */ 1170 break; 1171 } 1172 sa += len; 1173 offset -= len; 1174 } 1175 1176 if (type) 1177 *type = VM_FAULT_MINOR; 1178 return page; 1179 } 1180 1181 static struct vm_operations_struct sg_mmap_vm_ops = { 1182 .nopage = sg_vma_nopage, 1183 }; 1184 1185 static int 1186 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1187 { 1188 Sg_fd *sfp; 1189 unsigned long req_sz, len, sa; 1190 Sg_scatter_hold *rsv_schp; 1191 int k; 1192 struct scatterlist *sg; 1193 1194 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1195 return -ENXIO; 1196 req_sz = vma->vm_end - vma->vm_start; 1197 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1198 (void *) vma->vm_start, (int) req_sz)); 1199 if (vma->vm_pgoff) 1200 return -EINVAL; /* want no offset */ 1201 rsv_schp = &sfp->reserve; 1202 if (req_sz > rsv_schp->bufflen) 1203 return -ENOMEM; /* cannot map more than reserved buffer */ 1204 1205 sa = vma->vm_start; 1206 sg = rsv_schp->buffer; 1207 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1208 ++k, ++sg) { 1209 len = vma->vm_end - sa; 1210 len = (len < sg->length) ? len : sg->length; 1211 sa += len; 1212 } 1213 1214 sfp->mmap_called = 1; 1215 vma->vm_flags |= VM_RESERVED; 1216 vma->vm_private_data = sfp; 1217 vma->vm_ops = &sg_mmap_vm_ops; 1218 return 0; 1219 } 1220 1221 /* This function is a "bottom half" handler that is called by the 1222 * mid level when a command is completed (or has failed). */ 1223 static void 1224 sg_cmd_done(void *data, char *sense, int result, int resid) 1225 { 1226 Sg_request *srp = data; 1227 Sg_device *sdp = NULL; 1228 Sg_fd *sfp; 1229 unsigned long iflags; 1230 unsigned int ms; 1231 1232 if (NULL == srp) { 1233 printk(KERN_ERR "sg_cmd_done: NULL request\n"); 1234 return; 1235 } 1236 sfp = srp->parentfp; 1237 if (sfp) 1238 sdp = sfp->parentdp; 1239 if ((NULL == sdp) || sdp->detached) { 1240 printk(KERN_INFO "sg_cmd_done: device detached\n"); 1241 return; 1242 } 1243 1244 1245 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1246 sdp->disk->disk_name, srp->header.pack_id, result)); 1247 srp->header.resid = resid; 1248 ms = jiffies_to_msecs(jiffies); 1249 srp->header.duration = (ms > srp->header.duration) ? 1250 (ms - srp->header.duration) : 0; 1251 if (0 != result) { 1252 struct scsi_sense_hdr sshdr; 1253 1254 memcpy(srp->sense_b, sense, sizeof (srp->sense_b)); 1255 srp->header.status = 0xff & result; 1256 srp->header.masked_status = status_byte(result); 1257 srp->header.msg_status = msg_byte(result); 1258 srp->header.host_status = host_byte(result); 1259 srp->header.driver_status = driver_byte(result); 1260 if ((sdp->sgdebug > 0) && 1261 ((CHECK_CONDITION == srp->header.masked_status) || 1262 (COMMAND_TERMINATED == srp->header.masked_status))) 1263 __scsi_print_sense("sg_cmd_done", sense, 1264 SCSI_SENSE_BUFFERSIZE); 1265 1266 /* Following if statement is a patch supplied by Eric Youngdale */ 1267 if (driver_byte(result) != 0 1268 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1269 && !scsi_sense_is_deferred(&sshdr) 1270 && sshdr.sense_key == UNIT_ATTENTION 1271 && sdp->device->removable) { 1272 /* Detected possible disc change. Set the bit - this */ 1273 /* may be used if there are filesystems using this device */ 1274 sdp->device->changed = 1; 1275 } 1276 } 1277 /* Rely on write phase to clean out srp status values, so no "else" */ 1278 1279 if (sfp->closed) { /* whoops this fd already released, cleanup */ 1280 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); 1281 sg_finish_rem_req(srp); 1282 srp = NULL; 1283 if (NULL == sfp->headrp) { 1284 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n")); 1285 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ 1286 scsi_device_put(sdp->device); 1287 } 1288 sfp = NULL; 1289 } 1290 } else if (srp && srp->orphan) { 1291 if (sfp->keep_orphan) 1292 srp->sg_io_owned = 0; 1293 else { 1294 sg_finish_rem_req(srp); 1295 srp = NULL; 1296 } 1297 } 1298 if (sfp && srp) { 1299 /* Now wake up any sg_read() that is waiting for this packet. */ 1300 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1301 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1302 srp->done = 1; 1303 wake_up_interruptible(&sfp->read_wait); 1304 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1305 } 1306 } 1307 1308 static struct file_operations sg_fops = { 1309 .owner = THIS_MODULE, 1310 .read = sg_read, 1311 .write = sg_write, 1312 .poll = sg_poll, 1313 .ioctl = sg_ioctl, 1314 #ifdef CONFIG_COMPAT 1315 .compat_ioctl = sg_compat_ioctl, 1316 #endif 1317 .open = sg_open, 1318 .mmap = sg_mmap, 1319 .release = sg_release, 1320 .fasync = sg_fasync, 1321 }; 1322 1323 static struct class *sg_sysfs_class; 1324 1325 static int sg_sysfs_valid = 0; 1326 1327 static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1328 { 1329 struct request_queue *q = scsidp->request_queue; 1330 Sg_device *sdp; 1331 unsigned long iflags; 1332 void *old_sg_dev_arr = NULL; 1333 int k, error; 1334 1335 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1336 if (!sdp) { 1337 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1338 return -ENOMEM; 1339 } 1340 1341 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1342 if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */ 1343 Sg_device **tmp_da; 1344 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP; 1345 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1346 1347 tmp_da = kzalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL); 1348 if (unlikely(!tmp_da)) 1349 goto expand_failed; 1350 1351 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1352 memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *)); 1353 old_sg_dev_arr = sg_dev_arr; 1354 sg_dev_arr = tmp_da; 1355 sg_dev_max = tmp_dev_max; 1356 } 1357 1358 for (k = 0; k < sg_dev_max; k++) 1359 if (!sg_dev_arr[k]) 1360 break; 1361 if (unlikely(k >= SG_MAX_DEVS)) 1362 goto overflow; 1363 1364 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1365 sprintf(disk->disk_name, "sg%d", k); 1366 disk->first_minor = k; 1367 sdp->disk = disk; 1368 sdp->device = scsidp; 1369 init_waitqueue_head(&sdp->o_excl_wait); 1370 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments); 1371 1372 sg_nr_dev++; 1373 sg_dev_arr[k] = sdp; 1374 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1375 error = k; 1376 1377 out: 1378 if (error < 0) 1379 kfree(sdp); 1380 kfree(old_sg_dev_arr); 1381 return error; 1382 1383 expand_failed: 1384 printk(KERN_WARNING "sg_alloc: device array cannot be resized\n"); 1385 error = -ENOMEM; 1386 goto out; 1387 1388 overflow: 1389 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1390 sdev_printk(KERN_WARNING, scsidp, 1391 "Unable to attach sg device type=%d, minor " 1392 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); 1393 error = -ENODEV; 1394 goto out; 1395 } 1396 1397 static int 1398 sg_add(struct class_device *cl_dev, struct class_interface *cl_intf) 1399 { 1400 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); 1401 struct gendisk *disk; 1402 Sg_device *sdp = NULL; 1403 struct cdev * cdev = NULL; 1404 int error, k; 1405 1406 disk = alloc_disk(1); 1407 if (!disk) { 1408 printk(KERN_WARNING "alloc_disk failed\n"); 1409 return -ENOMEM; 1410 } 1411 disk->major = SCSI_GENERIC_MAJOR; 1412 1413 error = -ENOMEM; 1414 cdev = cdev_alloc(); 1415 if (!cdev) { 1416 printk(KERN_WARNING "cdev_alloc failed\n"); 1417 goto out; 1418 } 1419 cdev->owner = THIS_MODULE; 1420 cdev->ops = &sg_fops; 1421 1422 error = sg_alloc(disk, scsidp); 1423 if (error < 0) { 1424 printk(KERN_WARNING "sg_alloc failed\n"); 1425 goto out; 1426 } 1427 k = error; 1428 sdp = sg_dev_arr[k]; 1429 1430 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1); 1431 if (error) 1432 goto out; 1433 1434 sdp->cdev = cdev; 1435 if (sg_sysfs_valid) { 1436 struct class_device * sg_class_member; 1437 1438 sg_class_member = class_device_create(sg_sysfs_class, NULL, 1439 MKDEV(SCSI_GENERIC_MAJOR, k), 1440 cl_dev->dev, "%s", 1441 disk->disk_name); 1442 if (IS_ERR(sg_class_member)) 1443 printk(KERN_WARNING "sg_add: " 1444 "class_device_create failed\n"); 1445 class_set_devdata(sg_class_member, sdp); 1446 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1447 &sg_class_member->kobj, "generic"); 1448 if (error) 1449 printk(KERN_ERR "sg_add: unable to make symlink " 1450 "'generic' back to sg%d\n", k); 1451 } else 1452 printk(KERN_WARNING "sg_add: sg_sys INvalid\n"); 1453 1454 sdev_printk(KERN_NOTICE, scsidp, 1455 "Attached scsi generic sg%d type %d\n", k,scsidp->type); 1456 1457 return 0; 1458 1459 out: 1460 put_disk(disk); 1461 if (cdev) 1462 cdev_del(cdev); 1463 return error; 1464 } 1465 1466 static void 1467 sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf) 1468 { 1469 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); 1470 Sg_device *sdp = NULL; 1471 unsigned long iflags; 1472 Sg_fd *sfp; 1473 Sg_fd *tsfp; 1474 Sg_request *srp; 1475 Sg_request *tsrp; 1476 int k, delay; 1477 1478 if (NULL == sg_dev_arr) 1479 return; 1480 delay = 0; 1481 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1482 for (k = 0; k < sg_dev_max; k++) { 1483 sdp = sg_dev_arr[k]; 1484 if ((NULL == sdp) || (sdp->device != scsidp)) 1485 continue; /* dirty but lowers nesting */ 1486 if (sdp->headfp) { 1487 sdp->detached = 1; 1488 for (sfp = sdp->headfp; sfp; sfp = tsfp) { 1489 tsfp = sfp->nextfp; 1490 for (srp = sfp->headrp; srp; srp = tsrp) { 1491 tsrp = srp->nextrp; 1492 if (sfp->closed || (0 == sg_srp_done(srp, sfp))) 1493 sg_finish_rem_req(srp); 1494 } 1495 if (sfp->closed) { 1496 scsi_device_put(sdp->device); 1497 __sg_remove_sfp(sdp, sfp); 1498 } else { 1499 delay = 1; 1500 wake_up_interruptible(&sfp->read_wait); 1501 kill_fasync(&sfp->async_qp, SIGPOLL, 1502 POLL_HUP); 1503 } 1504 } 1505 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k)); 1506 if (NULL == sdp->headfp) { 1507 sg_dev_arr[k] = NULL; 1508 } 1509 } else { /* nothing active, simple case */ 1510 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k)); 1511 sg_dev_arr[k] = NULL; 1512 } 1513 sg_nr_dev--; 1514 break; 1515 } 1516 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1517 1518 if (sdp) { 1519 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1520 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k)); 1521 cdev_del(sdp->cdev); 1522 sdp->cdev = NULL; 1523 put_disk(sdp->disk); 1524 sdp->disk = NULL; 1525 if (NULL == sdp->headfp) 1526 kfree((char *) sdp); 1527 } 1528 1529 if (delay) 1530 msleep(10); /* dirty detach so delay device destruction */ 1531 } 1532 1533 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 1534 * of sysfs parameters (which module_param doesn't yet support). 1535 * Sysfs parameters defined explicitly below. 1536 */ 1537 module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO); 1538 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1539 1540 MODULE_AUTHOR("Douglas Gilbert"); 1541 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1542 MODULE_LICENSE("GPL"); 1543 MODULE_VERSION(SG_VERSION_STR); 1544 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1545 1546 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1547 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1548 1549 static int __init 1550 init_sg(void) 1551 { 1552 int rc; 1553 1554 if (def_reserved_size >= 0) 1555 sg_big_buff = def_reserved_size; 1556 1557 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1558 SG_MAX_DEVS, "sg"); 1559 if (rc) 1560 return rc; 1561 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1562 if ( IS_ERR(sg_sysfs_class) ) { 1563 rc = PTR_ERR(sg_sysfs_class); 1564 goto err_out; 1565 } 1566 sg_sysfs_valid = 1; 1567 rc = scsi_register_interface(&sg_interface); 1568 if (0 == rc) { 1569 #ifdef CONFIG_SCSI_PROC_FS 1570 sg_proc_init(); 1571 #endif /* CONFIG_SCSI_PROC_FS */ 1572 return 0; 1573 } 1574 class_destroy(sg_sysfs_class); 1575 err_out: 1576 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1577 return rc; 1578 } 1579 1580 static void __exit 1581 exit_sg(void) 1582 { 1583 #ifdef CONFIG_SCSI_PROC_FS 1584 sg_proc_cleanup(); 1585 #endif /* CONFIG_SCSI_PROC_FS */ 1586 scsi_unregister_interface(&sg_interface); 1587 class_destroy(sg_sysfs_class); 1588 sg_sysfs_valid = 0; 1589 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1590 SG_MAX_DEVS); 1591 kfree((char *)sg_dev_arr); 1592 sg_dev_arr = NULL; 1593 sg_dev_max = 0; 1594 } 1595 1596 static int 1597 sg_start_req(Sg_request * srp) 1598 { 1599 int res; 1600 Sg_fd *sfp = srp->parentfp; 1601 sg_io_hdr_t *hp = &srp->header; 1602 int dxfer_len = (int) hp->dxfer_len; 1603 int dxfer_dir = hp->dxfer_direction; 1604 Sg_scatter_hold *req_schp = &srp->data; 1605 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1606 1607 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); 1608 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1609 return 0; 1610 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && 1611 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && 1612 (!sfp->parentdp->device->host->unchecked_isa_dma)) { 1613 res = sg_build_direct(srp, sfp, dxfer_len); 1614 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ 1615 return res; 1616 } 1617 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) 1618 sg_link_reserve(sfp, srp, dxfer_len); 1619 else { 1620 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1621 if (res) { 1622 sg_remove_scat(req_schp); 1623 return res; 1624 } 1625 } 1626 return 0; 1627 } 1628 1629 static void 1630 sg_finish_rem_req(Sg_request * srp) 1631 { 1632 Sg_fd *sfp = srp->parentfp; 1633 Sg_scatter_hold *req_schp = &srp->data; 1634 1635 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1636 if (srp->res_used) 1637 sg_unlink_reserve(sfp, srp); 1638 else 1639 sg_remove_scat(req_schp); 1640 sg_remove_request(sfp, srp); 1641 } 1642 1643 static int 1644 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1645 { 1646 int sg_bufflen = tablesize * sizeof(struct scatterlist); 1647 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1648 1649 /* 1650 * TODO: test without low_dma, we should not need it since 1651 * the block layer will bounce the buffer for us 1652 * 1653 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list. 1654 */ 1655 if (sfp->low_dma) 1656 gfp_flags |= GFP_DMA; 1657 schp->buffer = kzalloc(sg_bufflen, gfp_flags); 1658 if (!schp->buffer) 1659 return -ENOMEM; 1660 schp->sglist_len = sg_bufflen; 1661 return tablesize; /* number of scat_gath elements allocated */ 1662 } 1663 1664 #ifdef SG_ALLOW_DIO_CODE 1665 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ 1666 /* TODO: hopefully we can use the generic block layer code */ 1667 1668 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if 1669 - mapping of all pages not successful 1670 (i.e., either completely successful or fails) 1671 */ 1672 static int 1673 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, 1674 unsigned long uaddr, size_t count, int rw) 1675 { 1676 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 1677 unsigned long start = uaddr >> PAGE_SHIFT; 1678 const int nr_pages = end - start; 1679 int res, i, j; 1680 struct page **pages; 1681 1682 /* User attempted Overflow! */ 1683 if ((uaddr + count) < uaddr) 1684 return -EINVAL; 1685 1686 /* Too big */ 1687 if (nr_pages > max_pages) 1688 return -ENOMEM; 1689 1690 /* Hmm? */ 1691 if (count == 0) 1692 return 0; 1693 1694 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) 1695 return -ENOMEM; 1696 1697 /* Try to fault in all of the necessary pages */ 1698 down_read(¤t->mm->mmap_sem); 1699 /* rw==READ means read from drive, write into memory area */ 1700 res = get_user_pages( 1701 current, 1702 current->mm, 1703 uaddr, 1704 nr_pages, 1705 rw == READ, 1706 0, /* don't force */ 1707 pages, 1708 NULL); 1709 up_read(¤t->mm->mmap_sem); 1710 1711 /* Errors and no page mapped should return here */ 1712 if (res < nr_pages) 1713 goto out_unmap; 1714 1715 for (i=0; i < nr_pages; i++) { 1716 /* FIXME: flush superflous for rw==READ, 1717 * probably wrong function for rw==WRITE 1718 */ 1719 flush_dcache_page(pages[i]); 1720 /* ?? Is locking needed? I don't think so */ 1721 /* if (TestSetPageLocked(pages[i])) 1722 goto out_unlock; */ 1723 } 1724 1725 sgl[0].page = pages[0]; 1726 sgl[0].offset = uaddr & ~PAGE_MASK; 1727 if (nr_pages > 1) { 1728 sgl[0].length = PAGE_SIZE - sgl[0].offset; 1729 count -= sgl[0].length; 1730 for (i=1; i < nr_pages ; i++) { 1731 sgl[i].page = pages[i]; 1732 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; 1733 count -= PAGE_SIZE; 1734 } 1735 } 1736 else { 1737 sgl[0].length = count; 1738 } 1739 1740 kfree(pages); 1741 return nr_pages; 1742 1743 out_unmap: 1744 if (res > 0) { 1745 for (j=0; j < res; j++) 1746 page_cache_release(pages[j]); 1747 res = 0; 1748 } 1749 kfree(pages); 1750 return res; 1751 } 1752 1753 1754 /* And unmap them... */ 1755 static int 1756 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, 1757 int dirtied) 1758 { 1759 int i; 1760 1761 for (i=0; i < nr_pages; i++) { 1762 struct page *page = sgl[i].page; 1763 1764 if (dirtied) 1765 SetPageDirty(page); 1766 /* unlock_page(page); */ 1767 /* FIXME: cache flush missing for rw==READ 1768 * FIXME: call the correct reference counting function 1769 */ 1770 page_cache_release(page); 1771 } 1772 1773 return 0; 1774 } 1775 1776 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ 1777 #endif 1778 1779 1780 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ 1781 static int 1782 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) 1783 { 1784 #ifdef SG_ALLOW_DIO_CODE 1785 sg_io_hdr_t *hp = &srp->header; 1786 Sg_scatter_hold *schp = &srp->data; 1787 int sg_tablesize = sfp->parentdp->sg_tablesize; 1788 int mx_sc_elems, res; 1789 struct scsi_device *sdev = sfp->parentdp->device; 1790 1791 if (((unsigned long)hp->dxferp & 1792 queue_dma_alignment(sdev->request_queue)) != 0) 1793 return 1; 1794 1795 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1796 if (mx_sc_elems <= 0) { 1797 return 1; 1798 } 1799 res = st_map_user_pages(schp->buffer, mx_sc_elems, 1800 (unsigned long)hp->dxferp, dxfer_len, 1801 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0); 1802 if (res <= 0) { 1803 sg_remove_scat(schp); 1804 return 1; 1805 } 1806 schp->k_use_sg = res; 1807 schp->dio_in_use = 1; 1808 hp->info |= SG_INFO_DIRECT_IO; 1809 return 0; 1810 #else 1811 return 1; 1812 #endif 1813 } 1814 1815 static int 1816 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1817 { 1818 struct scatterlist *sg; 1819 int ret_sz = 0, k, rem_sz, num, mx_sc_elems; 1820 int sg_tablesize = sfp->parentdp->sg_tablesize; 1821 int blk_size = buff_size; 1822 struct page *p = NULL; 1823 1824 if ((blk_size < 0) || (!sfp)) 1825 return -EFAULT; 1826 if (0 == blk_size) 1827 ++blk_size; /* don't know why */ 1828 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1829 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); 1830 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1831 buff_size, blk_size)); 1832 1833 /* N.B. ret_sz carried into this block ... */ 1834 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1835 if (mx_sc_elems < 0) 1836 return mx_sc_elems; /* most likely -ENOMEM */ 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) { 1841 1842 num = (rem_sz > SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz; 1843 p = sg_page_malloc(num, sfp->low_dma, &ret_sz); 1844 if (!p) 1845 return -ENOMEM; 1846 1847 sg->page = p; 1848 sg->length = ret_sz; 1849 1850 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n", 1851 k, p, ret_sz)); 1852 } /* end of for loop */ 1853 1854 schp->k_use_sg = k; 1855 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz)); 1856 1857 schp->bufflen = blk_size; 1858 if (rem_sz > 0) /* must have failed */ 1859 return -ENOMEM; 1860 1861 return 0; 1862 } 1863 1864 static int 1865 sg_write_xfer(Sg_request * srp) 1866 { 1867 sg_io_hdr_t *hp = &srp->header; 1868 Sg_scatter_hold *schp = &srp->data; 1869 struct scatterlist *sg = schp->buffer; 1870 int num_xfer = 0; 1871 int j, k, onum, usglen, ksglen, res; 1872 int iovec_count = (int) hp->iovec_count; 1873 int dxfer_dir = hp->dxfer_direction; 1874 unsigned char *p; 1875 unsigned char __user *up; 1876 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 1877 1878 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || 1879 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 1880 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); 1881 if (schp->bufflen < num_xfer) 1882 num_xfer = schp->bufflen; 1883 } 1884 if ((num_xfer <= 0) || (schp->dio_in_use) || 1885 (new_interface 1886 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 1887 return 0; 1888 1889 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 1890 num_xfer, iovec_count, schp->k_use_sg)); 1891 if (iovec_count) { 1892 onum = iovec_count; 1893 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 1894 return -EFAULT; 1895 } else 1896 onum = 1; 1897 1898 ksglen = sg->length; 1899 p = page_address(sg->page); 1900 for (j = 0, k = 0; j < onum; ++j) { 1901 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); 1902 if (res) 1903 return res; 1904 1905 for (; p; ++sg, ksglen = sg->length, 1906 p = page_address(sg->page)) { 1907 if (usglen <= 0) 1908 break; 1909 if (ksglen > usglen) { 1910 if (usglen >= num_xfer) { 1911 if (__copy_from_user(p, up, num_xfer)) 1912 return -EFAULT; 1913 return 0; 1914 } 1915 if (__copy_from_user(p, up, usglen)) 1916 return -EFAULT; 1917 p += usglen; 1918 ksglen -= usglen; 1919 break; 1920 } else { 1921 if (ksglen >= num_xfer) { 1922 if (__copy_from_user(p, up, num_xfer)) 1923 return -EFAULT; 1924 return 0; 1925 } 1926 if (__copy_from_user(p, up, ksglen)) 1927 return -EFAULT; 1928 up += ksglen; 1929 usglen -= ksglen; 1930 } 1931 ++k; 1932 if (k >= schp->k_use_sg) 1933 return 0; 1934 } 1935 } 1936 1937 return 0; 1938 } 1939 1940 static int 1941 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 1942 int wr_xf, int *countp, unsigned char __user **up) 1943 { 1944 int num_xfer = (int) hp->dxfer_len; 1945 unsigned char __user *p = hp->dxferp; 1946 int count; 1947 1948 if (0 == sg_num) { 1949 if (wr_xf && ('\0' == hp->interface_id)) 1950 count = (int) hp->flags; /* holds "old" input_size */ 1951 else 1952 count = num_xfer; 1953 } else { 1954 sg_iovec_t iovec; 1955 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) 1956 return -EFAULT; 1957 p = iovec.iov_base; 1958 count = (int) iovec.iov_len; 1959 } 1960 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) 1961 return -EFAULT; 1962 if (up) 1963 *up = p; 1964 if (countp) 1965 *countp = count; 1966 return 0; 1967 } 1968 1969 static void 1970 sg_remove_scat(Sg_scatter_hold * schp) 1971 { 1972 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1973 if (schp->buffer && (schp->sglist_len > 0)) { 1974 struct scatterlist *sg = schp->buffer; 1975 1976 if (schp->dio_in_use) { 1977 #ifdef SG_ALLOW_DIO_CODE 1978 st_unmap_user_pages(sg, schp->k_use_sg, TRUE); 1979 #endif 1980 } else { 1981 int k; 1982 1983 for (k = 0; (k < schp->k_use_sg) && sg->page; 1984 ++k, ++sg) { 1985 SCSI_LOG_TIMEOUT(5, printk( 1986 "sg_remove_scat: k=%d, a=0x%p, len=%d\n", 1987 k, sg->page, sg->length)); 1988 sg_page_free(sg->page, sg->length); 1989 } 1990 } 1991 kfree(schp->buffer); 1992 } 1993 memset(schp, 0, sizeof (*schp)); 1994 } 1995 1996 static int 1997 sg_read_xfer(Sg_request * srp) 1998 { 1999 sg_io_hdr_t *hp = &srp->header; 2000 Sg_scatter_hold *schp = &srp->data; 2001 struct scatterlist *sg = schp->buffer; 2002 int num_xfer = 0; 2003 int j, k, onum, usglen, ksglen, res; 2004 int iovec_count = (int) hp->iovec_count; 2005 int dxfer_dir = hp->dxfer_direction; 2006 unsigned char *p; 2007 unsigned char __user *up; 2008 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 2009 2010 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) 2011 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 2012 num_xfer = hp->dxfer_len; 2013 if (schp->bufflen < num_xfer) 2014 num_xfer = schp->bufflen; 2015 } 2016 if ((num_xfer <= 0) || (schp->dio_in_use) || 2017 (new_interface 2018 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 2019 return 0; 2020 2021 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 2022 num_xfer, iovec_count, schp->k_use_sg)); 2023 if (iovec_count) { 2024 onum = iovec_count; 2025 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 2026 return -EFAULT; 2027 } else 2028 onum = 1; 2029 2030 p = page_address(sg->page); 2031 ksglen = sg->length; 2032 for (j = 0, k = 0; j < onum; ++j) { 2033 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); 2034 if (res) 2035 return res; 2036 2037 for (; p; ++sg, ksglen = sg->length, 2038 p = page_address(sg->page)) { 2039 if (usglen <= 0) 2040 break; 2041 if (ksglen > usglen) { 2042 if (usglen >= num_xfer) { 2043 if (__copy_to_user(up, p, num_xfer)) 2044 return -EFAULT; 2045 return 0; 2046 } 2047 if (__copy_to_user(up, p, usglen)) 2048 return -EFAULT; 2049 p += usglen; 2050 ksglen -= usglen; 2051 break; 2052 } else { 2053 if (ksglen >= num_xfer) { 2054 if (__copy_to_user(up, p, num_xfer)) 2055 return -EFAULT; 2056 return 0; 2057 } 2058 if (__copy_to_user(up, p, ksglen)) 2059 return -EFAULT; 2060 up += ksglen; 2061 usglen -= ksglen; 2062 } 2063 ++k; 2064 if (k >= schp->k_use_sg) 2065 return 0; 2066 } 2067 } 2068 2069 return 0; 2070 } 2071 2072 static int 2073 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 2074 { 2075 Sg_scatter_hold *schp = &srp->data; 2076 struct scatterlist *sg = schp->buffer; 2077 int k, num; 2078 2079 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 2080 num_read_xfer)); 2081 if ((!outp) || (num_read_xfer <= 0)) 2082 return 0; 2083 2084 for (k = 0; (k < schp->k_use_sg) && sg->page; ++k, ++sg) { 2085 num = sg->length; 2086 if (num > num_read_xfer) { 2087 if (__copy_to_user(outp, page_address(sg->page), 2088 num_read_xfer)) 2089 return -EFAULT; 2090 break; 2091 } else { 2092 if (__copy_to_user(outp, page_address(sg->page), 2093 num)) 2094 return -EFAULT; 2095 num_read_xfer -= num; 2096 if (num_read_xfer <= 0) 2097 break; 2098 outp += num; 2099 } 2100 } 2101 2102 return 0; 2103 } 2104 2105 static void 2106 sg_build_reserve(Sg_fd * sfp, int req_size) 2107 { 2108 Sg_scatter_hold *schp = &sfp->reserve; 2109 2110 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 2111 do { 2112 if (req_size < PAGE_SIZE) 2113 req_size = PAGE_SIZE; 2114 if (0 == sg_build_indirect(schp, sfp, req_size)) 2115 return; 2116 else 2117 sg_remove_scat(schp); 2118 req_size >>= 1; /* divide by 2 */ 2119 } while (req_size > (PAGE_SIZE / 2)); 2120 } 2121 2122 static void 2123 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 2124 { 2125 Sg_scatter_hold *req_schp = &srp->data; 2126 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2127 struct scatterlist *sg = rsv_schp->buffer; 2128 int k, num, rem; 2129 2130 srp->res_used = 1; 2131 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 2132 rem = size; 2133 2134 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sg) { 2135 num = sg->length; 2136 if (rem <= num) { 2137 sfp->save_scat_len = num; 2138 sg->length = rem; 2139 req_schp->k_use_sg = k + 1; 2140 req_schp->sglist_len = rsv_schp->sglist_len; 2141 req_schp->buffer = rsv_schp->buffer; 2142 2143 req_schp->bufflen = size; 2144 req_schp->b_malloc_len = rsv_schp->b_malloc_len; 2145 break; 2146 } else 2147 rem -= num; 2148 } 2149 2150 if (k >= rsv_schp->k_use_sg) 2151 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 2152 } 2153 2154 static void 2155 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 2156 { 2157 Sg_scatter_hold *req_schp = &srp->data; 2158 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2159 2160 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 2161 (int) req_schp->k_use_sg)); 2162 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { 2163 struct scatterlist *sg = rsv_schp->buffer; 2164 2165 if (sfp->save_scat_len > 0) 2166 (sg + (req_schp->k_use_sg - 1))->length = 2167 (unsigned) sfp->save_scat_len; 2168 else 2169 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); 2170 } 2171 req_schp->k_use_sg = 0; 2172 req_schp->bufflen = 0; 2173 req_schp->buffer = NULL; 2174 req_schp->sglist_len = 0; 2175 sfp->save_scat_len = 0; 2176 srp->res_used = 0; 2177 } 2178 2179 static Sg_request * 2180 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 2181 { 2182 Sg_request *resp; 2183 unsigned long iflags; 2184 2185 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2186 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 2187 /* look for requests that are ready + not SG_IO owned */ 2188 if ((1 == resp->done) && (!resp->sg_io_owned) && 2189 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 2190 resp->done = 2; /* guard against other readers */ 2191 break; 2192 } 2193 } 2194 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2195 return resp; 2196 } 2197 2198 #ifdef CONFIG_SCSI_PROC_FS 2199 static Sg_request * 2200 sg_get_nth_request(Sg_fd * sfp, int nth) 2201 { 2202 Sg_request *resp; 2203 unsigned long iflags; 2204 int k; 2205 2206 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2207 for (k = 0, resp = sfp->headrp; resp && (k < nth); 2208 ++k, resp = resp->nextrp) ; 2209 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2210 return resp; 2211 } 2212 #endif 2213 2214 /* always adds to end of list */ 2215 static Sg_request * 2216 sg_add_request(Sg_fd * sfp) 2217 { 2218 int k; 2219 unsigned long iflags; 2220 Sg_request *resp; 2221 Sg_request *rp = sfp->req_arr; 2222 2223 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2224 resp = sfp->headrp; 2225 if (!resp) { 2226 memset(rp, 0, sizeof (Sg_request)); 2227 rp->parentfp = sfp; 2228 resp = rp; 2229 sfp->headrp = resp; 2230 } else { 2231 if (0 == sfp->cmd_q) 2232 resp = NULL; /* command queuing disallowed */ 2233 else { 2234 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2235 if (!rp->parentfp) 2236 break; 2237 } 2238 if (k < SG_MAX_QUEUE) { 2239 memset(rp, 0, sizeof (Sg_request)); 2240 rp->parentfp = sfp; 2241 while (resp->nextrp) 2242 resp = resp->nextrp; 2243 resp->nextrp = rp; 2244 resp = rp; 2245 } else 2246 resp = NULL; 2247 } 2248 } 2249 if (resp) { 2250 resp->nextrp = NULL; 2251 resp->header.duration = jiffies_to_msecs(jiffies); 2252 } 2253 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2254 return resp; 2255 } 2256 2257 /* Return of 1 for found; 0 for not found */ 2258 static int 2259 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2260 { 2261 Sg_request *prev_rp; 2262 Sg_request *rp; 2263 unsigned long iflags; 2264 int res = 0; 2265 2266 if ((!sfp) || (!srp) || (!sfp->headrp)) 2267 return res; 2268 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2269 prev_rp = sfp->headrp; 2270 if (srp == prev_rp) { 2271 sfp->headrp = prev_rp->nextrp; 2272 prev_rp->parentfp = NULL; 2273 res = 1; 2274 } else { 2275 while ((rp = prev_rp->nextrp)) { 2276 if (srp == rp) { 2277 prev_rp->nextrp = rp->nextrp; 2278 rp->parentfp = NULL; 2279 res = 1; 2280 break; 2281 } 2282 prev_rp = rp; 2283 } 2284 } 2285 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2286 return res; 2287 } 2288 2289 #ifdef CONFIG_SCSI_PROC_FS 2290 static Sg_fd * 2291 sg_get_nth_sfp(Sg_device * sdp, int nth) 2292 { 2293 Sg_fd *resp; 2294 unsigned long iflags; 2295 int k; 2296 2297 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2298 for (k = 0, resp = sdp->headfp; resp && (k < nth); 2299 ++k, resp = resp->nextfp) ; 2300 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2301 return resp; 2302 } 2303 #endif 2304 2305 static Sg_fd * 2306 sg_add_sfp(Sg_device * sdp, int dev) 2307 { 2308 Sg_fd *sfp; 2309 unsigned long iflags; 2310 2311 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2312 if (!sfp) 2313 return NULL; 2314 2315 init_waitqueue_head(&sfp->read_wait); 2316 rwlock_init(&sfp->rq_list_lock); 2317 2318 sfp->timeout = SG_DEFAULT_TIMEOUT; 2319 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2320 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2321 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2322 sdp->device->host->unchecked_isa_dma : 1; 2323 sfp->cmd_q = SG_DEF_COMMAND_Q; 2324 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2325 sfp->parentdp = sdp; 2326 write_lock_irqsave(&sg_dev_arr_lock, iflags); 2327 if (!sdp->headfp) 2328 sdp->headfp = sfp; 2329 else { /* add to tail of existing list */ 2330 Sg_fd *pfp = sdp->headfp; 2331 while (pfp->nextfp) 2332 pfp = pfp->nextfp; 2333 pfp->nextfp = sfp; 2334 } 2335 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2336 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2337 sg_build_reserve(sfp, sg_big_buff); 2338 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2339 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2340 return sfp; 2341 } 2342 2343 static void 2344 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2345 { 2346 Sg_fd *fp; 2347 Sg_fd *prev_fp; 2348 2349 prev_fp = sdp->headfp; 2350 if (sfp == prev_fp) 2351 sdp->headfp = prev_fp->nextfp; 2352 else { 2353 while ((fp = prev_fp->nextfp)) { 2354 if (sfp == fp) { 2355 prev_fp->nextfp = fp->nextfp; 2356 break; 2357 } 2358 prev_fp = fp; 2359 } 2360 } 2361 if (sfp->reserve.bufflen > 0) { 2362 SCSI_LOG_TIMEOUT(6, 2363 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2364 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); 2365 sg_remove_scat(&sfp->reserve); 2366 } 2367 sfp->parentdp = NULL; 2368 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); 2369 kfree(sfp); 2370 } 2371 2372 /* Returns 0 in normal case, 1 when detached and sdp object removed */ 2373 static int 2374 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2375 { 2376 Sg_request *srp; 2377 Sg_request *tsrp; 2378 int dirty = 0; 2379 int res = 0; 2380 2381 for (srp = sfp->headrp; srp; srp = tsrp) { 2382 tsrp = srp->nextrp; 2383 if (sg_srp_done(srp, sfp)) 2384 sg_finish_rem_req(srp); 2385 else 2386 ++dirty; 2387 } 2388 if (0 == dirty) { 2389 unsigned long iflags; 2390 2391 write_lock_irqsave(&sg_dev_arr_lock, iflags); 2392 __sg_remove_sfp(sdp, sfp); 2393 if (sdp->detached && (NULL == sdp->headfp)) { 2394 int k, maxd; 2395 2396 maxd = sg_dev_max; 2397 for (k = 0; k < maxd; ++k) { 2398 if (sdp == sg_dev_arr[k]) 2399 break; 2400 } 2401 if (k < maxd) 2402 sg_dev_arr[k] = NULL; 2403 kfree((char *) sdp); 2404 res = 1; 2405 } 2406 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2407 } else { 2408 /* MOD_INC's to inhibit unloading sg and associated adapter driver */ 2409 /* only bump the access_count if we actually succeeded in 2410 * throwing another counter on the host module */ 2411 scsi_device_get(sdp->device); /* XXX: retval ignored? */ 2412 sfp->closed = 1; /* flag dirty state on this fd */ 2413 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", 2414 dirty)); 2415 } 2416 return res; 2417 } 2418 2419 static int 2420 sg_res_in_use(Sg_fd * sfp) 2421 { 2422 const Sg_request *srp; 2423 unsigned long iflags; 2424 2425 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2426 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2427 if (srp->res_used) 2428 break; 2429 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2430 return srp ? 1 : 0; 2431 } 2432 2433 /* If retSzp==NULL want exact size or fail */ 2434 static struct page * 2435 sg_page_malloc(int rqSz, int lowDma, int *retSzp) 2436 { 2437 struct page *resp = NULL; 2438 gfp_t page_mask; 2439 int order, a_size; 2440 int resSz = rqSz; 2441 2442 if (rqSz <= 0) 2443 return resp; 2444 2445 if (lowDma) 2446 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN; 2447 else 2448 page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 2449 2450 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; 2451 order++, a_size <<= 1) ; 2452 resp = alloc_pages(page_mask, order); 2453 while ((!resp) && order && retSzp) { 2454 --order; 2455 a_size >>= 1; /* divide by 2, until PAGE_SIZE */ 2456 resp = alloc_pages(page_mask, order); /* try half */ 2457 resSz = a_size; 2458 } 2459 if (resp) { 2460 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2461 memset(page_address(resp), 0, resSz); 2462 if (retSzp) 2463 *retSzp = resSz; 2464 } 2465 return resp; 2466 } 2467 2468 static void 2469 sg_page_free(struct page *page, int size) 2470 { 2471 int order, a_size; 2472 2473 if (!page) 2474 return; 2475 for (order = 0, a_size = PAGE_SIZE; a_size < size; 2476 order++, a_size <<= 1) ; 2477 __free_pages(page, order); 2478 } 2479 2480 #ifndef MAINTENANCE_IN_CMD 2481 #define MAINTENANCE_IN_CMD 0xa3 2482 #endif 2483 2484 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, 2485 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, 2486 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, 2487 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD 2488 }; 2489 2490 static int 2491 sg_allow_access(unsigned char opcode, char dev_type) 2492 { 2493 int k; 2494 2495 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */ 2496 return 1; 2497 for (k = 0; k < sizeof (allow_ops); ++k) { 2498 if (opcode == allow_ops[k]) 2499 return 1; 2500 } 2501 return 0; 2502 } 2503 2504 #ifdef CONFIG_SCSI_PROC_FS 2505 static int 2506 sg_last_dev(void) 2507 { 2508 int k; 2509 unsigned long iflags; 2510 2511 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2512 for (k = sg_dev_max - 1; k >= 0; --k) 2513 if (sg_dev_arr[k] && sg_dev_arr[k]->device) 2514 break; 2515 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2516 return k + 1; /* origin 1 */ 2517 } 2518 #endif 2519 2520 static Sg_device * 2521 sg_get_dev(int dev) 2522 { 2523 Sg_device *sdp = NULL; 2524 unsigned long iflags; 2525 2526 if (sg_dev_arr && (dev >= 0)) { 2527 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2528 if (dev < sg_dev_max) 2529 sdp = sg_dev_arr[dev]; 2530 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2531 } 2532 return sdp; 2533 } 2534 2535 #ifdef CONFIG_SCSI_PROC_FS 2536 2537 static struct proc_dir_entry *sg_proc_sgp = NULL; 2538 2539 static char sg_proc_sg_dirname[] = "scsi/sg"; 2540 2541 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2542 2543 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2544 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2545 size_t count, loff_t *off); 2546 static struct file_operations adio_fops = { 2547 /* .owner, .read and .llseek added in sg_proc_init() */ 2548 .open = sg_proc_single_open_adio, 2549 .write = sg_proc_write_adio, 2550 .release = single_release, 2551 }; 2552 2553 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2554 static ssize_t sg_proc_write_dressz(struct file *filp, 2555 const char __user *buffer, size_t count, loff_t *off); 2556 static struct file_operations dressz_fops = { 2557 .open = sg_proc_single_open_dressz, 2558 .write = sg_proc_write_dressz, 2559 .release = single_release, 2560 }; 2561 2562 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2563 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2564 static struct file_operations version_fops = { 2565 .open = sg_proc_single_open_version, 2566 .release = single_release, 2567 }; 2568 2569 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2570 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2571 static struct file_operations devhdr_fops = { 2572 .open = sg_proc_single_open_devhdr, 2573 .release = single_release, 2574 }; 2575 2576 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2577 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2578 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2579 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2580 static void dev_seq_stop(struct seq_file *s, void *v); 2581 static struct file_operations dev_fops = { 2582 .open = sg_proc_open_dev, 2583 .release = seq_release, 2584 }; 2585 static struct seq_operations dev_seq_ops = { 2586 .start = dev_seq_start, 2587 .next = dev_seq_next, 2588 .stop = dev_seq_stop, 2589 .show = sg_proc_seq_show_dev, 2590 }; 2591 2592 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2593 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2594 static struct file_operations devstrs_fops = { 2595 .open = sg_proc_open_devstrs, 2596 .release = seq_release, 2597 }; 2598 static struct seq_operations devstrs_seq_ops = { 2599 .start = dev_seq_start, 2600 .next = dev_seq_next, 2601 .stop = dev_seq_stop, 2602 .show = sg_proc_seq_show_devstrs, 2603 }; 2604 2605 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2606 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2607 static struct file_operations debug_fops = { 2608 .open = sg_proc_open_debug, 2609 .release = seq_release, 2610 }; 2611 static struct seq_operations debug_seq_ops = { 2612 .start = dev_seq_start, 2613 .next = dev_seq_next, 2614 .stop = dev_seq_stop, 2615 .show = sg_proc_seq_show_debug, 2616 }; 2617 2618 2619 struct sg_proc_leaf { 2620 const char * name; 2621 struct file_operations * fops; 2622 }; 2623 2624 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2625 {"allow_dio", &adio_fops}, 2626 {"debug", &debug_fops}, 2627 {"def_reserved_size", &dressz_fops}, 2628 {"device_hdr", &devhdr_fops}, 2629 {"devices", &dev_fops}, 2630 {"device_strs", &devstrs_fops}, 2631 {"version", &version_fops} 2632 }; 2633 2634 static int 2635 sg_proc_init(void) 2636 { 2637 int k, mask; 2638 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2639 struct proc_dir_entry *pdep; 2640 struct sg_proc_leaf * leaf; 2641 2642 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2643 if (!sg_proc_sgp) 2644 return 1; 2645 for (k = 0; k < num_leaves; ++k) { 2646 leaf = &sg_proc_leaf_arr[k]; 2647 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2648 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp); 2649 if (pdep) { 2650 leaf->fops->owner = THIS_MODULE, 2651 leaf->fops->read = seq_read, 2652 leaf->fops->llseek = seq_lseek, 2653 pdep->proc_fops = leaf->fops; 2654 } 2655 } 2656 return 0; 2657 } 2658 2659 static void 2660 sg_proc_cleanup(void) 2661 { 2662 int k; 2663 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2664 2665 if (!sg_proc_sgp) 2666 return; 2667 for (k = 0; k < num_leaves; ++k) 2668 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2669 remove_proc_entry(sg_proc_sg_dirname, NULL); 2670 } 2671 2672 2673 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2674 { 2675 seq_printf(s, "%d\n", *((int *)s->private)); 2676 return 0; 2677 } 2678 2679 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2680 { 2681 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2682 } 2683 2684 static ssize_t 2685 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2686 size_t count, loff_t *off) 2687 { 2688 int num; 2689 char buff[11]; 2690 2691 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2692 return -EACCES; 2693 num = (count < 10) ? count : 10; 2694 if (copy_from_user(buff, buffer, num)) 2695 return -EFAULT; 2696 buff[num] = '\0'; 2697 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2698 return count; 2699 } 2700 2701 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2702 { 2703 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2704 } 2705 2706 static ssize_t 2707 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2708 size_t count, loff_t *off) 2709 { 2710 int num; 2711 unsigned long k = ULONG_MAX; 2712 char buff[11]; 2713 2714 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2715 return -EACCES; 2716 num = (count < 10) ? count : 10; 2717 if (copy_from_user(buff, buffer, num)) 2718 return -EFAULT; 2719 buff[num] = '\0'; 2720 k = simple_strtoul(buff, NULL, 10); 2721 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2722 sg_big_buff = k; 2723 return count; 2724 } 2725 return -ERANGE; 2726 } 2727 2728 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2729 { 2730 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2731 sg_version_date); 2732 return 0; 2733 } 2734 2735 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2736 { 2737 return single_open(file, sg_proc_seq_show_version, NULL); 2738 } 2739 2740 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2741 { 2742 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2743 "online\n"); 2744 return 0; 2745 } 2746 2747 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2748 { 2749 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2750 } 2751 2752 struct sg_proc_deviter { 2753 loff_t index; 2754 size_t max; 2755 }; 2756 2757 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2758 { 2759 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2760 2761 s->private = it; 2762 if (! it) 2763 return NULL; 2764 2765 if (NULL == sg_dev_arr) 2766 return NULL; 2767 it->index = *pos; 2768 it->max = sg_last_dev(); 2769 if (it->index >= it->max) 2770 return NULL; 2771 return it; 2772 } 2773 2774 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2775 { 2776 struct sg_proc_deviter * it = s->private; 2777 2778 *pos = ++it->index; 2779 return (it->index < it->max) ? it : NULL; 2780 } 2781 2782 static void dev_seq_stop(struct seq_file *s, void *v) 2783 { 2784 kfree(s->private); 2785 } 2786 2787 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2788 { 2789 return seq_open(file, &dev_seq_ops); 2790 } 2791 2792 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2793 { 2794 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2795 Sg_device *sdp; 2796 struct scsi_device *scsidp; 2797 2798 sdp = it ? sg_get_dev(it->index) : NULL; 2799 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2800 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2801 scsidp->host->host_no, scsidp->channel, 2802 scsidp->id, scsidp->lun, (int) scsidp->type, 2803 1, 2804 (int) scsidp->queue_depth, 2805 (int) scsidp->device_busy, 2806 (int) scsi_device_online(scsidp)); 2807 else 2808 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2809 return 0; 2810 } 2811 2812 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2813 { 2814 return seq_open(file, &devstrs_seq_ops); 2815 } 2816 2817 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2818 { 2819 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2820 Sg_device *sdp; 2821 struct scsi_device *scsidp; 2822 2823 sdp = it ? sg_get_dev(it->index) : NULL; 2824 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2825 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2826 scsidp->vendor, scsidp->model, scsidp->rev); 2827 else 2828 seq_printf(s, "<no active device>\n"); 2829 return 0; 2830 } 2831 2832 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2833 { 2834 int k, m, new_interface, blen, usg; 2835 Sg_request *srp; 2836 Sg_fd *fp; 2837 const sg_io_hdr_t *hp; 2838 const char * cp; 2839 unsigned int ms; 2840 2841 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { 2842 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2843 "(res)sgat=%d low_dma=%d\n", k + 1, 2844 jiffies_to_msecs(fp->timeout), 2845 fp->reserve.bufflen, 2846 (int) fp->reserve.k_use_sg, 2847 (int) fp->low_dma); 2848 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2849 (int) fp->cmd_q, (int) fp->force_packid, 2850 (int) fp->keep_orphan, (int) fp->closed); 2851 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { 2852 hp = &srp->header; 2853 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2854 if (srp->res_used) { 2855 if (new_interface && 2856 (SG_FLAG_MMAP_IO & hp->flags)) 2857 cp = " mmap>> "; 2858 else 2859 cp = " rb>> "; 2860 } else { 2861 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2862 cp = " dio>> "; 2863 else 2864 cp = " "; 2865 } 2866 seq_printf(s, cp); 2867 blen = srp->data.bufflen; 2868 usg = srp->data.k_use_sg; 2869 seq_printf(s, srp->done ? 2870 ((1 == srp->done) ? "rcv:" : "fin:") 2871 : "act:"); 2872 seq_printf(s, " id=%d blen=%d", 2873 srp->header.pack_id, blen); 2874 if (srp->done) 2875 seq_printf(s, " dur=%d", hp->duration); 2876 else { 2877 ms = jiffies_to_msecs(jiffies); 2878 seq_printf(s, " t_o/elap=%d/%d", 2879 (new_interface ? hp->timeout : 2880 jiffies_to_msecs(fp->timeout)), 2881 (ms > hp->duration ? ms - hp->duration : 0)); 2882 } 2883 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2884 (int) srp->data.cmd_opcode); 2885 } 2886 if (0 == m) 2887 seq_printf(s, " No requests active\n"); 2888 } 2889 } 2890 2891 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2892 { 2893 return seq_open(file, &debug_seq_ops); 2894 } 2895 2896 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2897 { 2898 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2899 Sg_device *sdp; 2900 2901 if (it && (0 == it->index)) { 2902 seq_printf(s, "dev_max(currently)=%d max_active_device=%d " 2903 "(origin 1)\n", sg_dev_max, (int)it->max); 2904 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2905 } 2906 sdp = it ? sg_get_dev(it->index) : NULL; 2907 if (sdp) { 2908 struct scsi_device *scsidp = sdp->device; 2909 2910 if (NULL == scsidp) { 2911 seq_printf(s, "device %d detached ??\n", 2912 (int)it->index); 2913 return 0; 2914 } 2915 2916 if (sg_get_nth_sfp(sdp, 0)) { 2917 seq_printf(s, " >>> device=%s ", 2918 sdp->disk->disk_name); 2919 if (sdp->detached) 2920 seq_printf(s, "detached pending close "); 2921 else 2922 seq_printf 2923 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2924 scsidp->host->host_no, 2925 scsidp->channel, scsidp->id, 2926 scsidp->lun, 2927 scsidp->host->hostt->emulated); 2928 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2929 sdp->sg_tablesize, sdp->exclude); 2930 } 2931 sg_proc_debug_helper(s, sdp); 2932 } 2933 return 0; 2934 } 2935 2936 #endif /* CONFIG_SCSI_PROC_FS */ 2937 2938 module_init(init_sg); 2939 module_exit(exit_sg); 2940