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/module.h> 32 33 #include <linux/fs.h> 34 #include <linux/kernel.h> 35 #include <linux/sched.h> 36 #include <linux/string.h> 37 #include <linux/mm.h> 38 #include <linux/errno.h> 39 #include <linux/mtio.h> 40 #include <linux/ioctl.h> 41 #include <linux/fcntl.h> 42 #include <linux/init.h> 43 #include <linux/poll.h> 44 #include <linux/smp_lock.h> 45 #include <linux/moduleparam.h> 46 #include <linux/cdev.h> 47 #include <linux/seq_file.h> 48 #include <linux/blkdev.h> 49 #include <linux/delay.h> 50 #include <linux/scatterlist.h> 51 52 #include "scsi.h" 53 #include <scsi/scsi_dbg.h> 54 #include <scsi/scsi_host.h> 55 #include <scsi/scsi_driver.h> 56 #include <scsi/scsi_ioctl.h> 57 #include <scsi/sg.h> 58 59 #include "scsi_logging.h" 60 61 #ifdef CONFIG_SCSI_PROC_FS 62 #include <linux/proc_fs.h> 63 static char *sg_version_date = "20050908"; 64 65 static int sg_proc_init(void); 66 static void sg_proc_cleanup(void); 67 #endif 68 69 #define SG_ALLOW_DIO_DEF 0 70 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */ 71 72 #define SG_MAX_DEVS 32768 73 74 /* 75 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 76 * Then when using 32 bit integers x * m may overflow during the calculation. 77 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 78 * calculates the same, but prevents the overflow when both m and d 79 * are "small" numbers (like HZ and USER_HZ). 80 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 81 * in 32 bits. 82 */ 83 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 84 85 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 86 87 int sg_big_buff = SG_DEF_RESERVED_SIZE; 88 /* N.B. This variable is readable and writeable via 89 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 90 of this size (or less if there is not enough memory) will be reserved 91 for use by this file descriptor. [Deprecated usage: this variable is also 92 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 93 the kernel (i.e. it is not a module).] */ 94 static int def_reserved_size = -1; /* picks up init parameter */ 95 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 96 97 #define SG_SECTOR_SZ 512 98 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) 99 100 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */ 101 102 static int sg_add(struct class_device *, struct class_interface *); 103 static void sg_remove(struct class_device *, struct class_interface *); 104 105 static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock 106 file descriptor list for device */ 107 108 static struct class_interface sg_interface = { 109 .add = sg_add, 110 .remove = sg_remove, 111 }; 112 113 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 114 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 115 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */ 116 unsigned bufflen; /* Size of (aggregate) data buffer */ 117 unsigned b_malloc_len; /* actual len malloc'ed in buffer */ 118 struct scatterlist *buffer;/* scatter list */ 119 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 120 unsigned char cmd_opcode; /* first byte of command */ 121 } Sg_scatter_hold; 122 123 struct sg_device; /* forward declarations */ 124 struct sg_fd; 125 126 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 127 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 128 struct sg_fd *parentfp; /* NULL -> not in use */ 129 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 130 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 131 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; 132 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 133 char orphan; /* 1 -> drop on sight, 0 -> normal */ 134 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 135 volatile char done; /* 0->before bh, 1->before read, 2->read */ 136 } Sg_request; 137 138 typedef struct sg_fd { /* holds the state of a file descriptor */ 139 struct sg_fd *nextfp; /* NULL when last opened fd on this device */ 140 struct sg_device *parentdp; /* owning device */ 141 wait_queue_head_t read_wait; /* queue read until command done */ 142 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 143 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 144 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 145 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 146 unsigned save_scat_len; /* original length of trunc. scat. element */ 147 Sg_request *headrp; /* head of request slist, NULL->empty */ 148 struct fasync_struct *async_qp; /* used by asynchronous notification */ 149 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 150 char low_dma; /* as in parent but possibly overridden to 1 */ 151 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 152 volatile char closed; /* 1 -> fd closed but request(s) outstanding */ 153 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 154 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ 155 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 156 char mmap_called; /* 0 -> mmap() never called on this fd */ 157 } Sg_fd; 158 159 typedef struct sg_device { /* holds the state of each scsi generic device */ 160 struct scsi_device *device; 161 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ 162 int sg_tablesize; /* adapter's max scatter-gather table size */ 163 Sg_fd *headfp; /* first open fd belonging to this device */ 164 volatile char detached; /* 0->attached, 1->detached pending removal */ 165 volatile char exclude; /* opened for exclusive access */ 166 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 167 struct gendisk *disk; 168 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 169 } Sg_device; 170 171 static int sg_fasync(int fd, struct file *filp, int mode); 172 /* tasklet or soft irq callback */ 173 static void sg_cmd_done(void *data, char *sense, int result, int resid); 174 static int sg_start_req(Sg_request * srp); 175 static void sg_finish_rem_req(Sg_request * srp); 176 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 177 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, 178 int tablesize); 179 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 180 Sg_request * srp); 181 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 182 int blocking, int read_only, Sg_request ** o_srp); 183 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 184 unsigned char *cmnd, int timeout, int blocking); 185 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 186 int wr_xf, int *countp, unsigned char __user **up); 187 static int sg_write_xfer(Sg_request * srp); 188 static int sg_read_xfer(Sg_request * srp); 189 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 190 static void sg_remove_scat(Sg_scatter_hold * schp); 191 static void sg_build_reserve(Sg_fd * sfp, int req_size); 192 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 193 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 194 static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp); 195 static void sg_page_free(struct page *page, int size); 196 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 197 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 198 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 199 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 200 static Sg_request *sg_add_request(Sg_fd * sfp); 201 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 202 static int sg_res_in_use(Sg_fd * sfp); 203 static int sg_allow_access(unsigned char opcode, char dev_type); 204 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); 205 static Sg_device *sg_get_dev(int dev); 206 #ifdef CONFIG_SCSI_PROC_FS 207 static int sg_last_dev(void); 208 #endif 209 210 static Sg_device **sg_dev_arr = NULL; 211 static int sg_dev_max; 212 static int sg_nr_dev; 213 214 #define SZ_SG_HEADER sizeof(struct sg_header) 215 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 216 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 217 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 218 219 static int 220 sg_open(struct inode *inode, struct file *filp) 221 { 222 int dev = iminor(inode); 223 int flags = filp->f_flags; 224 struct request_queue *q; 225 Sg_device *sdp; 226 Sg_fd *sfp; 227 int res; 228 int retval; 229 230 nonseekable_open(inode, filp); 231 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 232 sdp = sg_get_dev(dev); 233 if ((!sdp) || (!sdp->device)) 234 return -ENXIO; 235 if (sdp->detached) 236 return -ENODEV; 237 238 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 239 /* Prevent the device driver from vanishing while we sleep */ 240 retval = scsi_device_get(sdp->device); 241 if (retval) 242 return retval; 243 244 if (!((flags & O_NONBLOCK) || 245 scsi_block_when_processing_errors(sdp->device))) { 246 retval = -ENXIO; 247 /* we are in error recovery for this device */ 248 goto error_out; 249 } 250 251 if (flags & O_EXCL) { 252 if (O_RDONLY == (flags & O_ACCMODE)) { 253 retval = -EPERM; /* Can't lock it with read only access */ 254 goto error_out; 255 } 256 if (sdp->headfp && (flags & O_NONBLOCK)) { 257 retval = -EBUSY; 258 goto error_out; 259 } 260 res = 0; 261 __wait_event_interruptible(sdp->o_excl_wait, 262 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); 263 if (res) { 264 retval = res; /* -ERESTARTSYS because signal hit process */ 265 goto error_out; 266 } 267 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ 268 if (flags & O_NONBLOCK) { 269 retval = -EBUSY; 270 goto error_out; 271 } 272 res = 0; 273 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), 274 res); 275 if (res) { 276 retval = res; /* -ERESTARTSYS because signal hit process */ 277 goto error_out; 278 } 279 } 280 if (sdp->detached) { 281 retval = -ENODEV; 282 goto error_out; 283 } 284 if (!sdp->headfp) { /* no existing opens on this device */ 285 sdp->sgdebug = 0; 286 q = sdp->device->request_queue; 287 sdp->sg_tablesize = min(q->max_hw_segments, 288 q->max_phys_segments); 289 } 290 if ((sfp = sg_add_sfp(sdp, dev))) 291 filp->private_data = sfp; 292 else { 293 if (flags & O_EXCL) 294 sdp->exclude = 0; /* undo if error */ 295 retval = -ENOMEM; 296 goto error_out; 297 } 298 return 0; 299 300 error_out: 301 scsi_device_put(sdp->device); 302 return retval; 303 } 304 305 /* Following function was formerly called 'sg_close' */ 306 static int 307 sg_release(struct inode *inode, struct file *filp) 308 { 309 Sg_device *sdp; 310 Sg_fd *sfp; 311 312 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 313 return -ENXIO; 314 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 315 sg_fasync(-1, filp, 0); /* remove filp from async notification list */ 316 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ 317 if (!sdp->detached) { 318 scsi_device_put(sdp->device); 319 } 320 sdp->exclude = 0; 321 wake_up_interruptible(&sdp->o_excl_wait); 322 } 323 return 0; 324 } 325 326 static ssize_t 327 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 328 { 329 Sg_device *sdp; 330 Sg_fd *sfp; 331 Sg_request *srp; 332 int req_pack_id = -1; 333 sg_io_hdr_t *hp; 334 struct sg_header *old_hdr = NULL; 335 int retval = 0; 336 337 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 338 return -ENXIO; 339 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 340 sdp->disk->disk_name, (int) count)); 341 342 if (!access_ok(VERIFY_WRITE, buf, count)) 343 return -EFAULT; 344 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 345 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 346 if (!old_hdr) 347 return -ENOMEM; 348 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 349 retval = -EFAULT; 350 goto free_old_hdr; 351 } 352 if (old_hdr->reply_len < 0) { 353 if (count >= SZ_SG_IO_HDR) { 354 sg_io_hdr_t *new_hdr; 355 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 356 if (!new_hdr) { 357 retval = -ENOMEM; 358 goto free_old_hdr; 359 } 360 retval =__copy_from_user 361 (new_hdr, buf, SZ_SG_IO_HDR); 362 req_pack_id = new_hdr->pack_id; 363 kfree(new_hdr); 364 if (retval) { 365 retval = -EFAULT; 366 goto free_old_hdr; 367 } 368 } 369 } else 370 req_pack_id = old_hdr->pack_id; 371 } 372 srp = sg_get_rq_mark(sfp, req_pack_id); 373 if (!srp) { /* now wait on packet to arrive */ 374 if (sdp->detached) { 375 retval = -ENODEV; 376 goto free_old_hdr; 377 } 378 if (filp->f_flags & O_NONBLOCK) { 379 retval = -EAGAIN; 380 goto free_old_hdr; 381 } 382 while (1) { 383 retval = 0; /* following macro beats race condition */ 384 __wait_event_interruptible(sfp->read_wait, 385 (sdp->detached || 386 (srp = sg_get_rq_mark(sfp, req_pack_id))), 387 retval); 388 if (sdp->detached) { 389 retval = -ENODEV; 390 goto free_old_hdr; 391 } 392 if (0 == retval) 393 break; 394 395 /* -ERESTARTSYS as signal hit process */ 396 goto free_old_hdr; 397 } 398 } 399 if (srp->header.interface_id != '\0') { 400 retval = sg_new_read(sfp, buf, count, srp); 401 goto free_old_hdr; 402 } 403 404 hp = &srp->header; 405 if (old_hdr == NULL) { 406 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 407 if (! old_hdr) { 408 retval = -ENOMEM; 409 goto free_old_hdr; 410 } 411 } 412 memset(old_hdr, 0, SZ_SG_HEADER); 413 old_hdr->reply_len = (int) hp->timeout; 414 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 415 old_hdr->pack_id = hp->pack_id; 416 old_hdr->twelve_byte = 417 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 418 old_hdr->target_status = hp->masked_status; 419 old_hdr->host_status = hp->host_status; 420 old_hdr->driver_status = hp->driver_status; 421 if ((CHECK_CONDITION & hp->masked_status) || 422 (DRIVER_SENSE & hp->driver_status)) 423 memcpy(old_hdr->sense_buffer, srp->sense_b, 424 sizeof (old_hdr->sense_buffer)); 425 switch (hp->host_status) { 426 /* This setup of 'result' is for backward compatibility and is best 427 ignored by the user who should use target, host + driver status */ 428 case DID_OK: 429 case DID_PASSTHROUGH: 430 case DID_SOFT_ERROR: 431 old_hdr->result = 0; 432 break; 433 case DID_NO_CONNECT: 434 case DID_BUS_BUSY: 435 case DID_TIME_OUT: 436 old_hdr->result = EBUSY; 437 break; 438 case DID_BAD_TARGET: 439 case DID_ABORT: 440 case DID_PARITY: 441 case DID_RESET: 442 case DID_BAD_INTR: 443 old_hdr->result = EIO; 444 break; 445 case DID_ERROR: 446 old_hdr->result = (srp->sense_b[0] == 0 && 447 hp->masked_status == GOOD) ? 0 : EIO; 448 break; 449 default: 450 old_hdr->result = EIO; 451 break; 452 } 453 454 /* Now copy the result back to the user buffer. */ 455 if (count >= SZ_SG_HEADER) { 456 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 457 retval = -EFAULT; 458 goto free_old_hdr; 459 } 460 buf += SZ_SG_HEADER; 461 if (count > old_hdr->reply_len) 462 count = old_hdr->reply_len; 463 if (count > SZ_SG_HEADER) { 464 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 465 retval = -EFAULT; 466 goto free_old_hdr; 467 } 468 } 469 } else 470 count = (old_hdr->result == 0) ? 0 : -EIO; 471 sg_finish_rem_req(srp); 472 retval = count; 473 free_old_hdr: 474 kfree(old_hdr); 475 return retval; 476 } 477 478 static ssize_t 479 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 480 { 481 sg_io_hdr_t *hp = &srp->header; 482 int err = 0; 483 int len; 484 485 if (count < SZ_SG_IO_HDR) { 486 err = -EINVAL; 487 goto err_out; 488 } 489 hp->sb_len_wr = 0; 490 if ((hp->mx_sb_len > 0) && hp->sbp) { 491 if ((CHECK_CONDITION & hp->masked_status) || 492 (DRIVER_SENSE & hp->driver_status)) { 493 int sb_len = SCSI_SENSE_BUFFERSIZE; 494 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 495 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 496 len = (len > sb_len) ? sb_len : len; 497 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 498 err = -EFAULT; 499 goto err_out; 500 } 501 hp->sb_len_wr = len; 502 } 503 } 504 if (hp->masked_status || hp->host_status || hp->driver_status) 505 hp->info |= SG_INFO_CHECK; 506 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 507 err = -EFAULT; 508 goto err_out; 509 } 510 err = sg_read_xfer(srp); 511 err_out: 512 sg_finish_rem_req(srp); 513 return (0 == err) ? count : err; 514 } 515 516 static ssize_t 517 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 518 { 519 int mxsize, cmd_size, k; 520 int input_size, blocking; 521 unsigned char opcode; 522 Sg_device *sdp; 523 Sg_fd *sfp; 524 Sg_request *srp; 525 struct sg_header old_hdr; 526 sg_io_hdr_t *hp; 527 unsigned char cmnd[MAX_COMMAND_SIZE]; 528 529 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 530 return -ENXIO; 531 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 532 sdp->disk->disk_name, (int) count)); 533 if (sdp->detached) 534 return -ENODEV; 535 if (!((filp->f_flags & O_NONBLOCK) || 536 scsi_block_when_processing_errors(sdp->device))) 537 return -ENXIO; 538 539 if (!access_ok(VERIFY_READ, buf, count)) 540 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 541 if (count < SZ_SG_HEADER) 542 return -EIO; 543 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 544 return -EFAULT; 545 blocking = !(filp->f_flags & O_NONBLOCK); 546 if (old_hdr.reply_len < 0) 547 return sg_new_write(sfp, buf, count, blocking, 0, NULL); 548 if (count < (SZ_SG_HEADER + 6)) 549 return -EIO; /* The minimum scsi command length is 6 bytes. */ 550 551 if (!(srp = sg_add_request(sfp))) { 552 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 553 return -EDOM; 554 } 555 buf += SZ_SG_HEADER; 556 __get_user(opcode, buf); 557 if (sfp->next_cmd_len > 0) { 558 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 559 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 560 sfp->next_cmd_len = 0; 561 sg_remove_request(sfp, srp); 562 return -EIO; 563 } 564 cmd_size = sfp->next_cmd_len; 565 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 566 } else { 567 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 568 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 569 cmd_size = 12; 570 } 571 SCSI_LOG_TIMEOUT(4, printk( 572 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 573 /* Determine buffer size. */ 574 input_size = count - cmd_size; 575 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 576 mxsize -= SZ_SG_HEADER; 577 input_size -= SZ_SG_HEADER; 578 if (input_size < 0) { 579 sg_remove_request(sfp, srp); 580 return -EIO; /* User did not pass enough bytes for this command. */ 581 } 582 hp = &srp->header; 583 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 584 hp->cmd_len = (unsigned char) cmd_size; 585 hp->iovec_count = 0; 586 hp->mx_sb_len = 0; 587 if (input_size > 0) 588 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 589 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 590 else 591 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 592 hp->dxfer_len = mxsize; 593 hp->dxferp = (char __user *)buf + cmd_size; 594 hp->sbp = NULL; 595 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 596 hp->flags = input_size; /* structure abuse ... */ 597 hp->pack_id = old_hdr.pack_id; 598 hp->usr_ptr = NULL; 599 if (__copy_from_user(cmnd, buf, cmd_size)) 600 return -EFAULT; 601 /* 602 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 603 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 604 * is a non-zero input_size, so emit a warning. 605 */ 606 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) 607 if (printk_ratelimit()) 608 printk(KERN_WARNING 609 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" 610 "guessing data in;\n" KERN_WARNING " " 611 "program %s not setting count and/or reply_len properly\n", 612 old_hdr.reply_len - (int)SZ_SG_HEADER, 613 input_size, (unsigned int) cmnd[0], 614 current->comm); 615 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 616 return (k < 0) ? k : count; 617 } 618 619 static ssize_t 620 sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 621 int blocking, int read_only, Sg_request ** o_srp) 622 { 623 int k; 624 Sg_request *srp; 625 sg_io_hdr_t *hp; 626 unsigned char cmnd[MAX_COMMAND_SIZE]; 627 int timeout; 628 unsigned long ul_timeout; 629 630 if (count < SZ_SG_IO_HDR) 631 return -EINVAL; 632 if (!access_ok(VERIFY_READ, buf, count)) 633 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 634 635 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 636 if (!(srp = sg_add_request(sfp))) { 637 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 638 return -EDOM; 639 } 640 hp = &srp->header; 641 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 642 sg_remove_request(sfp, srp); 643 return -EFAULT; 644 } 645 if (hp->interface_id != 'S') { 646 sg_remove_request(sfp, srp); 647 return -ENOSYS; 648 } 649 if (hp->flags & SG_FLAG_MMAP_IO) { 650 if (hp->dxfer_len > sfp->reserve.bufflen) { 651 sg_remove_request(sfp, srp); 652 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 653 } 654 if (hp->flags & SG_FLAG_DIRECT_IO) { 655 sg_remove_request(sfp, srp); 656 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 657 } 658 if (sg_res_in_use(sfp)) { 659 sg_remove_request(sfp, srp); 660 return -EBUSY; /* reserve buffer already being used */ 661 } 662 } 663 ul_timeout = msecs_to_jiffies(srp->header.timeout); 664 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 665 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 666 sg_remove_request(sfp, srp); 667 return -EMSGSIZE; 668 } 669 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 670 sg_remove_request(sfp, srp); 671 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 672 } 673 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 674 sg_remove_request(sfp, srp); 675 return -EFAULT; 676 } 677 if (read_only && 678 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) { 679 sg_remove_request(sfp, srp); 680 return -EPERM; 681 } 682 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 683 if (k < 0) 684 return k; 685 if (o_srp) 686 *o_srp = srp; 687 return count; 688 } 689 690 static int 691 sg_common_write(Sg_fd * sfp, Sg_request * srp, 692 unsigned char *cmnd, int timeout, int blocking) 693 { 694 int k, data_dir; 695 Sg_device *sdp = sfp->parentdp; 696 sg_io_hdr_t *hp = &srp->header; 697 698 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 699 hp->status = 0; 700 hp->masked_status = 0; 701 hp->msg_status = 0; 702 hp->info = 0; 703 hp->host_status = 0; 704 hp->driver_status = 0; 705 hp->resid = 0; 706 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 707 (int) cmnd[0], (int) hp->cmd_len)); 708 709 if ((k = sg_start_req(srp))) { 710 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k)); 711 sg_finish_rem_req(srp); 712 return k; /* probably out of space --> ENOMEM */ 713 } 714 if ((k = sg_write_xfer(srp))) { 715 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n")); 716 sg_finish_rem_req(srp); 717 return k; 718 } 719 if (sdp->detached) { 720 sg_finish_rem_req(srp); 721 return -ENODEV; 722 } 723 724 switch (hp->dxfer_direction) { 725 case SG_DXFER_TO_FROM_DEV: 726 case SG_DXFER_FROM_DEV: 727 data_dir = DMA_FROM_DEVICE; 728 break; 729 case SG_DXFER_TO_DEV: 730 data_dir = DMA_TO_DEVICE; 731 break; 732 case SG_DXFER_UNKNOWN: 733 data_dir = DMA_BIDIRECTIONAL; 734 break; 735 default: 736 data_dir = DMA_NONE; 737 break; 738 } 739 hp->duration = jiffies_to_msecs(jiffies); 740 /* Now send everything of to mid-level. The next time we hear about this 741 packet is when sg_cmd_done() is called (i.e. a callback). */ 742 if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer, 743 hp->dxfer_len, srp->data.k_use_sg, timeout, 744 SG_DEFAULT_RETRIES, srp, sg_cmd_done, 745 GFP_ATOMIC)) { 746 SCSI_LOG_TIMEOUT(1, printk("sg_write: scsi_execute_async failed\n")); 747 /* 748 * most likely out of mem, but could also be a bad map 749 */ 750 sg_finish_rem_req(srp); 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 sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, 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 unsigned long iflags; 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 cdev_add_err; 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 cdev_add_err: 1460 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1461 kfree(sg_dev_arr[k]); 1462 sg_dev_arr[k] = NULL; 1463 sg_nr_dev--; 1464 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1465 1466 out: 1467 put_disk(disk); 1468 if (cdev) 1469 cdev_del(cdev); 1470 return error; 1471 } 1472 1473 static void 1474 sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf) 1475 { 1476 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); 1477 Sg_device *sdp = NULL; 1478 unsigned long iflags; 1479 Sg_fd *sfp; 1480 Sg_fd *tsfp; 1481 Sg_request *srp; 1482 Sg_request *tsrp; 1483 int k, delay; 1484 1485 if (NULL == sg_dev_arr) 1486 return; 1487 delay = 0; 1488 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1489 for (k = 0; k < sg_dev_max; k++) { 1490 sdp = sg_dev_arr[k]; 1491 if ((NULL == sdp) || (sdp->device != scsidp)) 1492 continue; /* dirty but lowers nesting */ 1493 if (sdp->headfp) { 1494 sdp->detached = 1; 1495 for (sfp = sdp->headfp; sfp; sfp = tsfp) { 1496 tsfp = sfp->nextfp; 1497 for (srp = sfp->headrp; srp; srp = tsrp) { 1498 tsrp = srp->nextrp; 1499 if (sfp->closed || (0 == sg_srp_done(srp, sfp))) 1500 sg_finish_rem_req(srp); 1501 } 1502 if (sfp->closed) { 1503 scsi_device_put(sdp->device); 1504 __sg_remove_sfp(sdp, sfp); 1505 } else { 1506 delay = 1; 1507 wake_up_interruptible(&sfp->read_wait); 1508 kill_fasync(&sfp->async_qp, SIGPOLL, 1509 POLL_HUP); 1510 } 1511 } 1512 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k)); 1513 if (NULL == sdp->headfp) { 1514 sg_dev_arr[k] = NULL; 1515 } 1516 } else { /* nothing active, simple case */ 1517 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k)); 1518 sg_dev_arr[k] = NULL; 1519 } 1520 sg_nr_dev--; 1521 break; 1522 } 1523 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1524 1525 if (sdp) { 1526 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1527 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k)); 1528 cdev_del(sdp->cdev); 1529 sdp->cdev = NULL; 1530 put_disk(sdp->disk); 1531 sdp->disk = NULL; 1532 if (NULL == sdp->headfp) 1533 kfree((char *) sdp); 1534 } 1535 1536 if (delay) 1537 msleep(10); /* dirty detach so delay device destruction */ 1538 } 1539 1540 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 1541 * of sysfs parameters (which module_param doesn't yet support). 1542 * Sysfs parameters defined explicitly below. 1543 */ 1544 module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO); 1545 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1546 1547 MODULE_AUTHOR("Douglas Gilbert"); 1548 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1549 MODULE_LICENSE("GPL"); 1550 MODULE_VERSION(SG_VERSION_STR); 1551 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1552 1553 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1554 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1555 1556 static int __init 1557 init_sg(void) 1558 { 1559 int rc; 1560 1561 if (def_reserved_size >= 0) 1562 sg_big_buff = def_reserved_size; 1563 1564 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1565 SG_MAX_DEVS, "sg"); 1566 if (rc) 1567 return rc; 1568 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1569 if ( IS_ERR(sg_sysfs_class) ) { 1570 rc = PTR_ERR(sg_sysfs_class); 1571 goto err_out; 1572 } 1573 sg_sysfs_valid = 1; 1574 rc = scsi_register_interface(&sg_interface); 1575 if (0 == rc) { 1576 #ifdef CONFIG_SCSI_PROC_FS 1577 sg_proc_init(); 1578 #endif /* CONFIG_SCSI_PROC_FS */ 1579 return 0; 1580 } 1581 class_destroy(sg_sysfs_class); 1582 err_out: 1583 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1584 return rc; 1585 } 1586 1587 static void __exit 1588 exit_sg(void) 1589 { 1590 #ifdef CONFIG_SCSI_PROC_FS 1591 sg_proc_cleanup(); 1592 #endif /* CONFIG_SCSI_PROC_FS */ 1593 scsi_unregister_interface(&sg_interface); 1594 class_destroy(sg_sysfs_class); 1595 sg_sysfs_valid = 0; 1596 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1597 SG_MAX_DEVS); 1598 kfree((char *)sg_dev_arr); 1599 sg_dev_arr = NULL; 1600 sg_dev_max = 0; 1601 } 1602 1603 static int 1604 sg_start_req(Sg_request * srp) 1605 { 1606 int res; 1607 Sg_fd *sfp = srp->parentfp; 1608 sg_io_hdr_t *hp = &srp->header; 1609 int dxfer_len = (int) hp->dxfer_len; 1610 int dxfer_dir = hp->dxfer_direction; 1611 Sg_scatter_hold *req_schp = &srp->data; 1612 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1613 1614 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); 1615 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1616 return 0; 1617 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && 1618 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && 1619 (!sfp->parentdp->device->host->unchecked_isa_dma)) { 1620 res = sg_build_direct(srp, sfp, dxfer_len); 1621 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ 1622 return res; 1623 } 1624 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) 1625 sg_link_reserve(sfp, srp, dxfer_len); 1626 else { 1627 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1628 if (res) { 1629 sg_remove_scat(req_schp); 1630 return res; 1631 } 1632 } 1633 return 0; 1634 } 1635 1636 static void 1637 sg_finish_rem_req(Sg_request * srp) 1638 { 1639 Sg_fd *sfp = srp->parentfp; 1640 Sg_scatter_hold *req_schp = &srp->data; 1641 1642 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1643 if (srp->res_used) 1644 sg_unlink_reserve(sfp, srp); 1645 else 1646 sg_remove_scat(req_schp); 1647 sg_remove_request(sfp, srp); 1648 } 1649 1650 static int 1651 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1652 { 1653 int sg_bufflen = tablesize * sizeof(struct scatterlist); 1654 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1655 1656 /* 1657 * TODO: test without low_dma, we should not need it since 1658 * the block layer will bounce the buffer for us 1659 * 1660 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list. 1661 */ 1662 if (sfp->low_dma) 1663 gfp_flags |= GFP_DMA; 1664 schp->buffer = kzalloc(sg_bufflen, gfp_flags); 1665 if (!schp->buffer) 1666 return -ENOMEM; 1667 schp->sglist_len = sg_bufflen; 1668 return tablesize; /* number of scat_gath elements allocated */ 1669 } 1670 1671 #ifdef SG_ALLOW_DIO_CODE 1672 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ 1673 /* TODO: hopefully we can use the generic block layer code */ 1674 1675 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if 1676 - mapping of all pages not successful 1677 (i.e., either completely successful or fails) 1678 */ 1679 static int 1680 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, 1681 unsigned long uaddr, size_t count, int rw) 1682 { 1683 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 1684 unsigned long start = uaddr >> PAGE_SHIFT; 1685 const int nr_pages = end - start; 1686 int res, i, j; 1687 struct page **pages; 1688 1689 /* User attempted Overflow! */ 1690 if ((uaddr + count) < uaddr) 1691 return -EINVAL; 1692 1693 /* Too big */ 1694 if (nr_pages > max_pages) 1695 return -ENOMEM; 1696 1697 /* Hmm? */ 1698 if (count == 0) 1699 return 0; 1700 1701 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) 1702 return -ENOMEM; 1703 1704 /* Try to fault in all of the necessary pages */ 1705 down_read(¤t->mm->mmap_sem); 1706 /* rw==READ means read from drive, write into memory area */ 1707 res = get_user_pages( 1708 current, 1709 current->mm, 1710 uaddr, 1711 nr_pages, 1712 rw == READ, 1713 0, /* don't force */ 1714 pages, 1715 NULL); 1716 up_read(¤t->mm->mmap_sem); 1717 1718 /* Errors and no page mapped should return here */ 1719 if (res < nr_pages) 1720 goto out_unmap; 1721 1722 for (i=0; i < nr_pages; i++) { 1723 /* FIXME: flush superflous for rw==READ, 1724 * probably wrong function for rw==WRITE 1725 */ 1726 flush_dcache_page(pages[i]); 1727 /* ?? Is locking needed? I don't think so */ 1728 /* if (TestSetPageLocked(pages[i])) 1729 goto out_unlock; */ 1730 } 1731 1732 sgl[0].page = pages[0]; 1733 sgl[0].offset = uaddr & ~PAGE_MASK; 1734 if (nr_pages > 1) { 1735 sgl[0].length = PAGE_SIZE - sgl[0].offset; 1736 count -= sgl[0].length; 1737 for (i=1; i < nr_pages ; i++) { 1738 sgl[i].page = pages[i]; 1739 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; 1740 count -= PAGE_SIZE; 1741 } 1742 } 1743 else { 1744 sgl[0].length = count; 1745 } 1746 1747 kfree(pages); 1748 return nr_pages; 1749 1750 out_unmap: 1751 if (res > 0) { 1752 for (j=0; j < res; j++) 1753 page_cache_release(pages[j]); 1754 res = 0; 1755 } 1756 kfree(pages); 1757 return res; 1758 } 1759 1760 1761 /* And unmap them... */ 1762 static int 1763 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, 1764 int dirtied) 1765 { 1766 int i; 1767 1768 for (i=0; i < nr_pages; i++) { 1769 struct page *page = sgl[i].page; 1770 1771 if (dirtied) 1772 SetPageDirty(page); 1773 /* unlock_page(page); */ 1774 /* FIXME: cache flush missing for rw==READ 1775 * FIXME: call the correct reference counting function 1776 */ 1777 page_cache_release(page); 1778 } 1779 1780 return 0; 1781 } 1782 1783 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ 1784 #endif 1785 1786 1787 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ 1788 static int 1789 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) 1790 { 1791 #ifdef SG_ALLOW_DIO_CODE 1792 sg_io_hdr_t *hp = &srp->header; 1793 Sg_scatter_hold *schp = &srp->data; 1794 int sg_tablesize = sfp->parentdp->sg_tablesize; 1795 int mx_sc_elems, res; 1796 struct scsi_device *sdev = sfp->parentdp->device; 1797 1798 if (((unsigned long)hp->dxferp & 1799 queue_dma_alignment(sdev->request_queue)) != 0) 1800 return 1; 1801 1802 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1803 if (mx_sc_elems <= 0) { 1804 return 1; 1805 } 1806 res = st_map_user_pages(schp->buffer, mx_sc_elems, 1807 (unsigned long)hp->dxferp, dxfer_len, 1808 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0); 1809 if (res <= 0) { 1810 sg_remove_scat(schp); 1811 return 1; 1812 } 1813 schp->k_use_sg = res; 1814 schp->dio_in_use = 1; 1815 hp->info |= SG_INFO_DIRECT_IO; 1816 return 0; 1817 #else 1818 return 1; 1819 #endif 1820 } 1821 1822 static int 1823 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1824 { 1825 struct scatterlist *sg; 1826 int ret_sz = 0, k, rem_sz, num, mx_sc_elems; 1827 int sg_tablesize = sfp->parentdp->sg_tablesize; 1828 int blk_size = buff_size; 1829 struct page *p = NULL; 1830 1831 if ((blk_size < 0) || (!sfp)) 1832 return -EFAULT; 1833 if (0 == blk_size) 1834 ++blk_size; /* don't know why */ 1835 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1836 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); 1837 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1838 buff_size, blk_size)); 1839 1840 /* N.B. ret_sz carried into this block ... */ 1841 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1842 if (mx_sc_elems < 0) 1843 return mx_sc_elems; /* most likely -ENOMEM */ 1844 1845 for (k = 0, sg = schp->buffer, rem_sz = blk_size; 1846 (rem_sz > 0) && (k < mx_sc_elems); 1847 ++k, rem_sz -= ret_sz, ++sg) { 1848 1849 num = (rem_sz > SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz; 1850 p = sg_page_malloc(num, sfp->low_dma, &ret_sz); 1851 if (!p) 1852 return -ENOMEM; 1853 1854 sg->page = p; 1855 sg->length = ret_sz; 1856 1857 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n", 1858 k, p, ret_sz)); 1859 } /* end of for loop */ 1860 1861 schp->k_use_sg = k; 1862 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz)); 1863 1864 schp->bufflen = blk_size; 1865 if (rem_sz > 0) /* must have failed */ 1866 return -ENOMEM; 1867 1868 return 0; 1869 } 1870 1871 static int 1872 sg_write_xfer(Sg_request * srp) 1873 { 1874 sg_io_hdr_t *hp = &srp->header; 1875 Sg_scatter_hold *schp = &srp->data; 1876 struct scatterlist *sg = schp->buffer; 1877 int num_xfer = 0; 1878 int j, k, onum, usglen, ksglen, res; 1879 int iovec_count = (int) hp->iovec_count; 1880 int dxfer_dir = hp->dxfer_direction; 1881 unsigned char *p; 1882 unsigned char __user *up; 1883 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 1884 1885 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || 1886 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 1887 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); 1888 if (schp->bufflen < num_xfer) 1889 num_xfer = schp->bufflen; 1890 } 1891 if ((num_xfer <= 0) || (schp->dio_in_use) || 1892 (new_interface 1893 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 1894 return 0; 1895 1896 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 1897 num_xfer, iovec_count, schp->k_use_sg)); 1898 if (iovec_count) { 1899 onum = iovec_count; 1900 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 1901 return -EFAULT; 1902 } else 1903 onum = 1; 1904 1905 ksglen = sg->length; 1906 p = page_address(sg->page); 1907 for (j = 0, k = 0; j < onum; ++j) { 1908 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); 1909 if (res) 1910 return res; 1911 1912 for (; p; ++sg, ksglen = sg->length, 1913 p = page_address(sg->page)) { 1914 if (usglen <= 0) 1915 break; 1916 if (ksglen > usglen) { 1917 if (usglen >= num_xfer) { 1918 if (__copy_from_user(p, up, num_xfer)) 1919 return -EFAULT; 1920 return 0; 1921 } 1922 if (__copy_from_user(p, up, usglen)) 1923 return -EFAULT; 1924 p += usglen; 1925 ksglen -= usglen; 1926 break; 1927 } else { 1928 if (ksglen >= num_xfer) { 1929 if (__copy_from_user(p, up, num_xfer)) 1930 return -EFAULT; 1931 return 0; 1932 } 1933 if (__copy_from_user(p, up, ksglen)) 1934 return -EFAULT; 1935 up += ksglen; 1936 usglen -= ksglen; 1937 } 1938 ++k; 1939 if (k >= schp->k_use_sg) 1940 return 0; 1941 } 1942 } 1943 1944 return 0; 1945 } 1946 1947 static int 1948 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 1949 int wr_xf, int *countp, unsigned char __user **up) 1950 { 1951 int num_xfer = (int) hp->dxfer_len; 1952 unsigned char __user *p = hp->dxferp; 1953 int count; 1954 1955 if (0 == sg_num) { 1956 if (wr_xf && ('\0' == hp->interface_id)) 1957 count = (int) hp->flags; /* holds "old" input_size */ 1958 else 1959 count = num_xfer; 1960 } else { 1961 sg_iovec_t iovec; 1962 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) 1963 return -EFAULT; 1964 p = iovec.iov_base; 1965 count = (int) iovec.iov_len; 1966 } 1967 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) 1968 return -EFAULT; 1969 if (up) 1970 *up = p; 1971 if (countp) 1972 *countp = count; 1973 return 0; 1974 } 1975 1976 static void 1977 sg_remove_scat(Sg_scatter_hold * schp) 1978 { 1979 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1980 if (schp->buffer && (schp->sglist_len > 0)) { 1981 struct scatterlist *sg = schp->buffer; 1982 1983 if (schp->dio_in_use) { 1984 #ifdef SG_ALLOW_DIO_CODE 1985 st_unmap_user_pages(sg, schp->k_use_sg, TRUE); 1986 #endif 1987 } else { 1988 int k; 1989 1990 for (k = 0; (k < schp->k_use_sg) && sg->page; 1991 ++k, ++sg) { 1992 SCSI_LOG_TIMEOUT(5, printk( 1993 "sg_remove_scat: k=%d, a=0x%p, len=%d\n", 1994 k, sg->page, sg->length)); 1995 sg_page_free(sg->page, sg->length); 1996 } 1997 } 1998 kfree(schp->buffer); 1999 } 2000 memset(schp, 0, sizeof (*schp)); 2001 } 2002 2003 static int 2004 sg_read_xfer(Sg_request * srp) 2005 { 2006 sg_io_hdr_t *hp = &srp->header; 2007 Sg_scatter_hold *schp = &srp->data; 2008 struct scatterlist *sg = schp->buffer; 2009 int num_xfer = 0; 2010 int j, k, onum, usglen, ksglen, res; 2011 int iovec_count = (int) hp->iovec_count; 2012 int dxfer_dir = hp->dxfer_direction; 2013 unsigned char *p; 2014 unsigned char __user *up; 2015 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 2016 2017 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) 2018 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 2019 num_xfer = hp->dxfer_len; 2020 if (schp->bufflen < num_xfer) 2021 num_xfer = schp->bufflen; 2022 } 2023 if ((num_xfer <= 0) || (schp->dio_in_use) || 2024 (new_interface 2025 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 2026 return 0; 2027 2028 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 2029 num_xfer, iovec_count, schp->k_use_sg)); 2030 if (iovec_count) { 2031 onum = iovec_count; 2032 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 2033 return -EFAULT; 2034 } else 2035 onum = 1; 2036 2037 p = page_address(sg->page); 2038 ksglen = sg->length; 2039 for (j = 0, k = 0; j < onum; ++j) { 2040 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); 2041 if (res) 2042 return res; 2043 2044 for (; p; ++sg, ksglen = sg->length, 2045 p = page_address(sg->page)) { 2046 if (usglen <= 0) 2047 break; 2048 if (ksglen > usglen) { 2049 if (usglen >= num_xfer) { 2050 if (__copy_to_user(up, p, num_xfer)) 2051 return -EFAULT; 2052 return 0; 2053 } 2054 if (__copy_to_user(up, p, usglen)) 2055 return -EFAULT; 2056 p += usglen; 2057 ksglen -= usglen; 2058 break; 2059 } else { 2060 if (ksglen >= num_xfer) { 2061 if (__copy_to_user(up, p, num_xfer)) 2062 return -EFAULT; 2063 return 0; 2064 } 2065 if (__copy_to_user(up, p, ksglen)) 2066 return -EFAULT; 2067 up += ksglen; 2068 usglen -= ksglen; 2069 } 2070 ++k; 2071 if (k >= schp->k_use_sg) 2072 return 0; 2073 } 2074 } 2075 2076 return 0; 2077 } 2078 2079 static int 2080 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 2081 { 2082 Sg_scatter_hold *schp = &srp->data; 2083 struct scatterlist *sg = schp->buffer; 2084 int k, num; 2085 2086 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 2087 num_read_xfer)); 2088 if ((!outp) || (num_read_xfer <= 0)) 2089 return 0; 2090 2091 for (k = 0; (k < schp->k_use_sg) && sg->page; ++k, ++sg) { 2092 num = sg->length; 2093 if (num > num_read_xfer) { 2094 if (__copy_to_user(outp, page_address(sg->page), 2095 num_read_xfer)) 2096 return -EFAULT; 2097 break; 2098 } else { 2099 if (__copy_to_user(outp, page_address(sg->page), 2100 num)) 2101 return -EFAULT; 2102 num_read_xfer -= num; 2103 if (num_read_xfer <= 0) 2104 break; 2105 outp += num; 2106 } 2107 } 2108 2109 return 0; 2110 } 2111 2112 static void 2113 sg_build_reserve(Sg_fd * sfp, int req_size) 2114 { 2115 Sg_scatter_hold *schp = &sfp->reserve; 2116 2117 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 2118 do { 2119 if (req_size < PAGE_SIZE) 2120 req_size = PAGE_SIZE; 2121 if (0 == sg_build_indirect(schp, sfp, req_size)) 2122 return; 2123 else 2124 sg_remove_scat(schp); 2125 req_size >>= 1; /* divide by 2 */ 2126 } while (req_size > (PAGE_SIZE / 2)); 2127 } 2128 2129 static void 2130 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 2131 { 2132 Sg_scatter_hold *req_schp = &srp->data; 2133 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2134 struct scatterlist *sg = rsv_schp->buffer; 2135 int k, num, rem; 2136 2137 srp->res_used = 1; 2138 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 2139 rem = size; 2140 2141 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sg) { 2142 num = sg->length; 2143 if (rem <= num) { 2144 sfp->save_scat_len = num; 2145 sg->length = rem; 2146 req_schp->k_use_sg = k + 1; 2147 req_schp->sglist_len = rsv_schp->sglist_len; 2148 req_schp->buffer = rsv_schp->buffer; 2149 2150 req_schp->bufflen = size; 2151 req_schp->b_malloc_len = rsv_schp->b_malloc_len; 2152 break; 2153 } else 2154 rem -= num; 2155 } 2156 2157 if (k >= rsv_schp->k_use_sg) 2158 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 2159 } 2160 2161 static void 2162 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 2163 { 2164 Sg_scatter_hold *req_schp = &srp->data; 2165 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2166 2167 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 2168 (int) req_schp->k_use_sg)); 2169 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { 2170 struct scatterlist *sg = rsv_schp->buffer; 2171 2172 if (sfp->save_scat_len > 0) 2173 (sg + (req_schp->k_use_sg - 1))->length = 2174 (unsigned) sfp->save_scat_len; 2175 else 2176 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); 2177 } 2178 req_schp->k_use_sg = 0; 2179 req_schp->bufflen = 0; 2180 req_schp->buffer = NULL; 2181 req_schp->sglist_len = 0; 2182 sfp->save_scat_len = 0; 2183 srp->res_used = 0; 2184 } 2185 2186 static Sg_request * 2187 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 2188 { 2189 Sg_request *resp; 2190 unsigned long iflags; 2191 2192 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2193 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 2194 /* look for requests that are ready + not SG_IO owned */ 2195 if ((1 == resp->done) && (!resp->sg_io_owned) && 2196 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 2197 resp->done = 2; /* guard against other readers */ 2198 break; 2199 } 2200 } 2201 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2202 return resp; 2203 } 2204 2205 #ifdef CONFIG_SCSI_PROC_FS 2206 static Sg_request * 2207 sg_get_nth_request(Sg_fd * sfp, int nth) 2208 { 2209 Sg_request *resp; 2210 unsigned long iflags; 2211 int k; 2212 2213 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2214 for (k = 0, resp = sfp->headrp; resp && (k < nth); 2215 ++k, resp = resp->nextrp) ; 2216 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2217 return resp; 2218 } 2219 #endif 2220 2221 /* always adds to end of list */ 2222 static Sg_request * 2223 sg_add_request(Sg_fd * sfp) 2224 { 2225 int k; 2226 unsigned long iflags; 2227 Sg_request *resp; 2228 Sg_request *rp = sfp->req_arr; 2229 2230 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2231 resp = sfp->headrp; 2232 if (!resp) { 2233 memset(rp, 0, sizeof (Sg_request)); 2234 rp->parentfp = sfp; 2235 resp = rp; 2236 sfp->headrp = resp; 2237 } else { 2238 if (0 == sfp->cmd_q) 2239 resp = NULL; /* command queuing disallowed */ 2240 else { 2241 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2242 if (!rp->parentfp) 2243 break; 2244 } 2245 if (k < SG_MAX_QUEUE) { 2246 memset(rp, 0, sizeof (Sg_request)); 2247 rp->parentfp = sfp; 2248 while (resp->nextrp) 2249 resp = resp->nextrp; 2250 resp->nextrp = rp; 2251 resp = rp; 2252 } else 2253 resp = NULL; 2254 } 2255 } 2256 if (resp) { 2257 resp->nextrp = NULL; 2258 resp->header.duration = jiffies_to_msecs(jiffies); 2259 } 2260 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2261 return resp; 2262 } 2263 2264 /* Return of 1 for found; 0 for not found */ 2265 static int 2266 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2267 { 2268 Sg_request *prev_rp; 2269 Sg_request *rp; 2270 unsigned long iflags; 2271 int res = 0; 2272 2273 if ((!sfp) || (!srp) || (!sfp->headrp)) 2274 return res; 2275 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2276 prev_rp = sfp->headrp; 2277 if (srp == prev_rp) { 2278 sfp->headrp = prev_rp->nextrp; 2279 prev_rp->parentfp = NULL; 2280 res = 1; 2281 } else { 2282 while ((rp = prev_rp->nextrp)) { 2283 if (srp == rp) { 2284 prev_rp->nextrp = rp->nextrp; 2285 rp->parentfp = NULL; 2286 res = 1; 2287 break; 2288 } 2289 prev_rp = rp; 2290 } 2291 } 2292 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2293 return res; 2294 } 2295 2296 #ifdef CONFIG_SCSI_PROC_FS 2297 static Sg_fd * 2298 sg_get_nth_sfp(Sg_device * sdp, int nth) 2299 { 2300 Sg_fd *resp; 2301 unsigned long iflags; 2302 int k; 2303 2304 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2305 for (k = 0, resp = sdp->headfp; resp && (k < nth); 2306 ++k, resp = resp->nextfp) ; 2307 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2308 return resp; 2309 } 2310 #endif 2311 2312 static Sg_fd * 2313 sg_add_sfp(Sg_device * sdp, int dev) 2314 { 2315 Sg_fd *sfp; 2316 unsigned long iflags; 2317 2318 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2319 if (!sfp) 2320 return NULL; 2321 2322 init_waitqueue_head(&sfp->read_wait); 2323 rwlock_init(&sfp->rq_list_lock); 2324 2325 sfp->timeout = SG_DEFAULT_TIMEOUT; 2326 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2327 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2328 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2329 sdp->device->host->unchecked_isa_dma : 1; 2330 sfp->cmd_q = SG_DEF_COMMAND_Q; 2331 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2332 sfp->parentdp = sdp; 2333 write_lock_irqsave(&sg_dev_arr_lock, iflags); 2334 if (!sdp->headfp) 2335 sdp->headfp = sfp; 2336 else { /* add to tail of existing list */ 2337 Sg_fd *pfp = sdp->headfp; 2338 while (pfp->nextfp) 2339 pfp = pfp->nextfp; 2340 pfp->nextfp = sfp; 2341 } 2342 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2343 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2344 sg_build_reserve(sfp, sg_big_buff); 2345 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2346 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2347 return sfp; 2348 } 2349 2350 static void 2351 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2352 { 2353 Sg_fd *fp; 2354 Sg_fd *prev_fp; 2355 2356 prev_fp = sdp->headfp; 2357 if (sfp == prev_fp) 2358 sdp->headfp = prev_fp->nextfp; 2359 else { 2360 while ((fp = prev_fp->nextfp)) { 2361 if (sfp == fp) { 2362 prev_fp->nextfp = fp->nextfp; 2363 break; 2364 } 2365 prev_fp = fp; 2366 } 2367 } 2368 if (sfp->reserve.bufflen > 0) { 2369 SCSI_LOG_TIMEOUT(6, 2370 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2371 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); 2372 sg_remove_scat(&sfp->reserve); 2373 } 2374 sfp->parentdp = NULL; 2375 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); 2376 kfree(sfp); 2377 } 2378 2379 /* Returns 0 in normal case, 1 when detached and sdp object removed */ 2380 static int 2381 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2382 { 2383 Sg_request *srp; 2384 Sg_request *tsrp; 2385 int dirty = 0; 2386 int res = 0; 2387 2388 for (srp = sfp->headrp; srp; srp = tsrp) { 2389 tsrp = srp->nextrp; 2390 if (sg_srp_done(srp, sfp)) 2391 sg_finish_rem_req(srp); 2392 else 2393 ++dirty; 2394 } 2395 if (0 == dirty) { 2396 unsigned long iflags; 2397 2398 write_lock_irqsave(&sg_dev_arr_lock, iflags); 2399 __sg_remove_sfp(sdp, sfp); 2400 if (sdp->detached && (NULL == sdp->headfp)) { 2401 int k, maxd; 2402 2403 maxd = sg_dev_max; 2404 for (k = 0; k < maxd; ++k) { 2405 if (sdp == sg_dev_arr[k]) 2406 break; 2407 } 2408 if (k < maxd) 2409 sg_dev_arr[k] = NULL; 2410 kfree((char *) sdp); 2411 res = 1; 2412 } 2413 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2414 } else { 2415 /* MOD_INC's to inhibit unloading sg and associated adapter driver */ 2416 /* only bump the access_count if we actually succeeded in 2417 * throwing another counter on the host module */ 2418 scsi_device_get(sdp->device); /* XXX: retval ignored? */ 2419 sfp->closed = 1; /* flag dirty state on this fd */ 2420 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", 2421 dirty)); 2422 } 2423 return res; 2424 } 2425 2426 static int 2427 sg_res_in_use(Sg_fd * sfp) 2428 { 2429 const Sg_request *srp; 2430 unsigned long iflags; 2431 2432 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2433 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2434 if (srp->res_used) 2435 break; 2436 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2437 return srp ? 1 : 0; 2438 } 2439 2440 /* If retSzp==NULL want exact size or fail */ 2441 static struct page * 2442 sg_page_malloc(int rqSz, int lowDma, int *retSzp) 2443 { 2444 struct page *resp = NULL; 2445 gfp_t page_mask; 2446 int order, a_size; 2447 int resSz = rqSz; 2448 2449 if (rqSz <= 0) 2450 return resp; 2451 2452 if (lowDma) 2453 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN; 2454 else 2455 page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 2456 2457 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; 2458 order++, a_size <<= 1) ; 2459 resp = alloc_pages(page_mask, order); 2460 while ((!resp) && order && retSzp) { 2461 --order; 2462 a_size >>= 1; /* divide by 2, until PAGE_SIZE */ 2463 resp = alloc_pages(page_mask, order); /* try half */ 2464 resSz = a_size; 2465 } 2466 if (resp) { 2467 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2468 memset(page_address(resp), 0, resSz); 2469 if (retSzp) 2470 *retSzp = resSz; 2471 } 2472 return resp; 2473 } 2474 2475 static void 2476 sg_page_free(struct page *page, int size) 2477 { 2478 int order, a_size; 2479 2480 if (!page) 2481 return; 2482 for (order = 0, a_size = PAGE_SIZE; a_size < size; 2483 order++, a_size <<= 1) ; 2484 __free_pages(page, order); 2485 } 2486 2487 #ifndef MAINTENANCE_IN_CMD 2488 #define MAINTENANCE_IN_CMD 0xa3 2489 #endif 2490 2491 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, 2492 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, 2493 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, 2494 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD 2495 }; 2496 2497 static int 2498 sg_allow_access(unsigned char opcode, char dev_type) 2499 { 2500 int k; 2501 2502 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */ 2503 return 1; 2504 for (k = 0; k < sizeof (allow_ops); ++k) { 2505 if (opcode == allow_ops[k]) 2506 return 1; 2507 } 2508 return 0; 2509 } 2510 2511 #ifdef CONFIG_SCSI_PROC_FS 2512 static int 2513 sg_last_dev(void) 2514 { 2515 int k; 2516 unsigned long iflags; 2517 2518 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2519 for (k = sg_dev_max - 1; k >= 0; --k) 2520 if (sg_dev_arr[k] && sg_dev_arr[k]->device) 2521 break; 2522 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2523 return k + 1; /* origin 1 */ 2524 } 2525 #endif 2526 2527 static Sg_device * 2528 sg_get_dev(int dev) 2529 { 2530 Sg_device *sdp = NULL; 2531 unsigned long iflags; 2532 2533 if (sg_dev_arr && (dev >= 0)) { 2534 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2535 if (dev < sg_dev_max) 2536 sdp = sg_dev_arr[dev]; 2537 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2538 } 2539 return sdp; 2540 } 2541 2542 #ifdef CONFIG_SCSI_PROC_FS 2543 2544 static struct proc_dir_entry *sg_proc_sgp = NULL; 2545 2546 static char sg_proc_sg_dirname[] = "scsi/sg"; 2547 2548 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2549 2550 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2551 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2552 size_t count, loff_t *off); 2553 static struct file_operations adio_fops = { 2554 /* .owner, .read and .llseek added in sg_proc_init() */ 2555 .open = sg_proc_single_open_adio, 2556 .write = sg_proc_write_adio, 2557 .release = single_release, 2558 }; 2559 2560 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2561 static ssize_t sg_proc_write_dressz(struct file *filp, 2562 const char __user *buffer, size_t count, loff_t *off); 2563 static struct file_operations dressz_fops = { 2564 .open = sg_proc_single_open_dressz, 2565 .write = sg_proc_write_dressz, 2566 .release = single_release, 2567 }; 2568 2569 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2570 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2571 static struct file_operations version_fops = { 2572 .open = sg_proc_single_open_version, 2573 .release = single_release, 2574 }; 2575 2576 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2577 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2578 static struct file_operations devhdr_fops = { 2579 .open = sg_proc_single_open_devhdr, 2580 .release = single_release, 2581 }; 2582 2583 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2584 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2585 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2586 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2587 static void dev_seq_stop(struct seq_file *s, void *v); 2588 static struct file_operations dev_fops = { 2589 .open = sg_proc_open_dev, 2590 .release = seq_release, 2591 }; 2592 static struct seq_operations dev_seq_ops = { 2593 .start = dev_seq_start, 2594 .next = dev_seq_next, 2595 .stop = dev_seq_stop, 2596 .show = sg_proc_seq_show_dev, 2597 }; 2598 2599 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2600 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2601 static struct file_operations devstrs_fops = { 2602 .open = sg_proc_open_devstrs, 2603 .release = seq_release, 2604 }; 2605 static struct seq_operations devstrs_seq_ops = { 2606 .start = dev_seq_start, 2607 .next = dev_seq_next, 2608 .stop = dev_seq_stop, 2609 .show = sg_proc_seq_show_devstrs, 2610 }; 2611 2612 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2613 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2614 static struct file_operations debug_fops = { 2615 .open = sg_proc_open_debug, 2616 .release = seq_release, 2617 }; 2618 static struct seq_operations debug_seq_ops = { 2619 .start = dev_seq_start, 2620 .next = dev_seq_next, 2621 .stop = dev_seq_stop, 2622 .show = sg_proc_seq_show_debug, 2623 }; 2624 2625 2626 struct sg_proc_leaf { 2627 const char * name; 2628 struct file_operations * fops; 2629 }; 2630 2631 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2632 {"allow_dio", &adio_fops}, 2633 {"debug", &debug_fops}, 2634 {"def_reserved_size", &dressz_fops}, 2635 {"device_hdr", &devhdr_fops}, 2636 {"devices", &dev_fops}, 2637 {"device_strs", &devstrs_fops}, 2638 {"version", &version_fops} 2639 }; 2640 2641 static int 2642 sg_proc_init(void) 2643 { 2644 int k, mask; 2645 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2646 struct proc_dir_entry *pdep; 2647 struct sg_proc_leaf * leaf; 2648 2649 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2650 if (!sg_proc_sgp) 2651 return 1; 2652 for (k = 0; k < num_leaves; ++k) { 2653 leaf = &sg_proc_leaf_arr[k]; 2654 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2655 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp); 2656 if (pdep) { 2657 leaf->fops->owner = THIS_MODULE, 2658 leaf->fops->read = seq_read, 2659 leaf->fops->llseek = seq_lseek, 2660 pdep->proc_fops = leaf->fops; 2661 } 2662 } 2663 return 0; 2664 } 2665 2666 static void 2667 sg_proc_cleanup(void) 2668 { 2669 int k; 2670 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2671 2672 if (!sg_proc_sgp) 2673 return; 2674 for (k = 0; k < num_leaves; ++k) 2675 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2676 remove_proc_entry(sg_proc_sg_dirname, NULL); 2677 } 2678 2679 2680 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2681 { 2682 seq_printf(s, "%d\n", *((int *)s->private)); 2683 return 0; 2684 } 2685 2686 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2687 { 2688 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2689 } 2690 2691 static ssize_t 2692 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2693 size_t count, loff_t *off) 2694 { 2695 int num; 2696 char buff[11]; 2697 2698 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2699 return -EACCES; 2700 num = (count < 10) ? count : 10; 2701 if (copy_from_user(buff, buffer, num)) 2702 return -EFAULT; 2703 buff[num] = '\0'; 2704 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2705 return count; 2706 } 2707 2708 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2709 { 2710 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2711 } 2712 2713 static ssize_t 2714 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2715 size_t count, loff_t *off) 2716 { 2717 int num; 2718 unsigned long k = ULONG_MAX; 2719 char buff[11]; 2720 2721 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2722 return -EACCES; 2723 num = (count < 10) ? count : 10; 2724 if (copy_from_user(buff, buffer, num)) 2725 return -EFAULT; 2726 buff[num] = '\0'; 2727 k = simple_strtoul(buff, NULL, 10); 2728 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2729 sg_big_buff = k; 2730 return count; 2731 } 2732 return -ERANGE; 2733 } 2734 2735 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2736 { 2737 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2738 sg_version_date); 2739 return 0; 2740 } 2741 2742 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2743 { 2744 return single_open(file, sg_proc_seq_show_version, NULL); 2745 } 2746 2747 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2748 { 2749 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2750 "online\n"); 2751 return 0; 2752 } 2753 2754 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2755 { 2756 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2757 } 2758 2759 struct sg_proc_deviter { 2760 loff_t index; 2761 size_t max; 2762 }; 2763 2764 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2765 { 2766 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2767 2768 s->private = it; 2769 if (! it) 2770 return NULL; 2771 2772 if (NULL == sg_dev_arr) 2773 return NULL; 2774 it->index = *pos; 2775 it->max = sg_last_dev(); 2776 if (it->index >= it->max) 2777 return NULL; 2778 return it; 2779 } 2780 2781 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2782 { 2783 struct sg_proc_deviter * it = s->private; 2784 2785 *pos = ++it->index; 2786 return (it->index < it->max) ? it : NULL; 2787 } 2788 2789 static void dev_seq_stop(struct seq_file *s, void *v) 2790 { 2791 kfree(s->private); 2792 } 2793 2794 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2795 { 2796 return seq_open(file, &dev_seq_ops); 2797 } 2798 2799 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2800 { 2801 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2802 Sg_device *sdp; 2803 struct scsi_device *scsidp; 2804 2805 sdp = it ? sg_get_dev(it->index) : NULL; 2806 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2807 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2808 scsidp->host->host_no, scsidp->channel, 2809 scsidp->id, scsidp->lun, (int) scsidp->type, 2810 1, 2811 (int) scsidp->queue_depth, 2812 (int) scsidp->device_busy, 2813 (int) scsi_device_online(scsidp)); 2814 else 2815 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2816 return 0; 2817 } 2818 2819 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2820 { 2821 return seq_open(file, &devstrs_seq_ops); 2822 } 2823 2824 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2825 { 2826 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2827 Sg_device *sdp; 2828 struct scsi_device *scsidp; 2829 2830 sdp = it ? sg_get_dev(it->index) : NULL; 2831 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2832 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2833 scsidp->vendor, scsidp->model, scsidp->rev); 2834 else 2835 seq_printf(s, "<no active device>\n"); 2836 return 0; 2837 } 2838 2839 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2840 { 2841 int k, m, new_interface, blen, usg; 2842 Sg_request *srp; 2843 Sg_fd *fp; 2844 const sg_io_hdr_t *hp; 2845 const char * cp; 2846 unsigned int ms; 2847 2848 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { 2849 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2850 "(res)sgat=%d low_dma=%d\n", k + 1, 2851 jiffies_to_msecs(fp->timeout), 2852 fp->reserve.bufflen, 2853 (int) fp->reserve.k_use_sg, 2854 (int) fp->low_dma); 2855 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2856 (int) fp->cmd_q, (int) fp->force_packid, 2857 (int) fp->keep_orphan, (int) fp->closed); 2858 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { 2859 hp = &srp->header; 2860 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2861 if (srp->res_used) { 2862 if (new_interface && 2863 (SG_FLAG_MMAP_IO & hp->flags)) 2864 cp = " mmap>> "; 2865 else 2866 cp = " rb>> "; 2867 } else { 2868 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2869 cp = " dio>> "; 2870 else 2871 cp = " "; 2872 } 2873 seq_printf(s, cp); 2874 blen = srp->data.bufflen; 2875 usg = srp->data.k_use_sg; 2876 seq_printf(s, srp->done ? 2877 ((1 == srp->done) ? "rcv:" : "fin:") 2878 : "act:"); 2879 seq_printf(s, " id=%d blen=%d", 2880 srp->header.pack_id, blen); 2881 if (srp->done) 2882 seq_printf(s, " dur=%d", hp->duration); 2883 else { 2884 ms = jiffies_to_msecs(jiffies); 2885 seq_printf(s, " t_o/elap=%d/%d", 2886 (new_interface ? hp->timeout : 2887 jiffies_to_msecs(fp->timeout)), 2888 (ms > hp->duration ? ms - hp->duration : 0)); 2889 } 2890 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2891 (int) srp->data.cmd_opcode); 2892 } 2893 if (0 == m) 2894 seq_printf(s, " No requests active\n"); 2895 } 2896 } 2897 2898 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2899 { 2900 return seq_open(file, &debug_seq_ops); 2901 } 2902 2903 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2904 { 2905 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2906 Sg_device *sdp; 2907 2908 if (it && (0 == it->index)) { 2909 seq_printf(s, "dev_max(currently)=%d max_active_device=%d " 2910 "(origin 1)\n", sg_dev_max, (int)it->max); 2911 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2912 } 2913 sdp = it ? sg_get_dev(it->index) : NULL; 2914 if (sdp) { 2915 struct scsi_device *scsidp = sdp->device; 2916 2917 if (NULL == scsidp) { 2918 seq_printf(s, "device %d detached ??\n", 2919 (int)it->index); 2920 return 0; 2921 } 2922 2923 if (sg_get_nth_sfp(sdp, 0)) { 2924 seq_printf(s, " >>> device=%s ", 2925 sdp->disk->disk_name); 2926 if (sdp->detached) 2927 seq_printf(s, "detached pending close "); 2928 else 2929 seq_printf 2930 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2931 scsidp->host->host_no, 2932 scsidp->channel, scsidp->id, 2933 scsidp->lun, 2934 scsidp->host->hostt->emulated); 2935 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2936 sdp->sg_tablesize, sdp->exclude); 2937 } 2938 sg_proc_debug_helper(s, sdp); 2939 } 2940 return 0; 2941 } 2942 2943 #endif /* CONFIG_SCSI_PROC_FS */ 2944 2945 module_init(init_sg); 2946 module_exit(exit_sg); 2947