1 /* 2 * History: 3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), 4 * to allow user process control of SCSI devices. 5 * Development Sponsored by Killy Corp. NY NY 6 * 7 * Original driver (sg.c): 8 * Copyright (C) 1992 Lawrence Foard 9 * Version 2 and 3 extensions to driver: 10 * Copyright (C) 1998 - 2005 Douglas Gilbert 11 * 12 * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 */ 20 21 static int sg_version_num = 30534; /* 2 digits for each component */ 22 #define SG_VERSION_STR "3.5.34" 23 24 /* 25 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes: 26 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First 27 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING 28 * (otherwise the macros compile to empty statements). 29 * 30 */ 31 #include <linux/module.h> 32 33 #include <linux/fs.h> 34 #include <linux/kernel.h> 35 #include <linux/sched.h> 36 #include <linux/string.h> 37 #include <linux/mm.h> 38 #include <linux/errno.h> 39 #include <linux/mtio.h> 40 #include <linux/ioctl.h> 41 #include <linux/fcntl.h> 42 #include <linux/init.h> 43 #include <linux/poll.h> 44 #include <linux/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 = "20061027"; 64 65 static int sg_proc_init(void); 66 static void sg_proc_cleanup(void); 67 #endif 68 69 #define SG_ALLOW_DIO_DEF 0 70 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */ 71 72 #define SG_MAX_DEVS 32768 73 74 /* 75 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 76 * Then when using 32 bit integers x * m may overflow during the calculation. 77 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 78 * calculates the same, but prevents the overflow when both m and d 79 * are "small" numbers (like HZ and USER_HZ). 80 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 81 * in 32 bits. 82 */ 83 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 84 85 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 86 87 int sg_big_buff = SG_DEF_RESERVED_SIZE; 88 /* N.B. This variable is readable and writeable via 89 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 90 of this size (or less if there is not enough memory) will be reserved 91 for use by this file descriptor. [Deprecated usage: this variable is also 92 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 93 the kernel (i.e. it is not a module).] */ 94 static int def_reserved_size = -1; /* picks up init parameter */ 95 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 96 97 static int scatter_elem_sz = SG_SCATTER_SZ; 98 static int scatter_elem_sz_prev = SG_SCATTER_SZ; 99 100 #define SG_SECTOR_SZ 512 101 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) 102 103 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */ 104 105 static int sg_add(struct class_device *, struct class_interface *); 106 static void sg_remove(struct class_device *, struct class_interface *); 107 108 static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock 109 file descriptor list for device */ 110 111 static struct class_interface sg_interface = { 112 .add = sg_add, 113 .remove = sg_remove, 114 }; 115 116 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 117 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 118 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */ 119 unsigned bufflen; /* Size of (aggregate) data buffer */ 120 unsigned b_malloc_len; /* actual len malloc'ed in buffer */ 121 struct scatterlist *buffer;/* scatter list */ 122 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 123 unsigned char cmd_opcode; /* first byte of command */ 124 } Sg_scatter_hold; 125 126 struct sg_device; /* forward declarations */ 127 struct sg_fd; 128 129 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 130 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 131 struct sg_fd *parentfp; /* NULL -> not in use */ 132 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 133 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 134 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; 135 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 136 char orphan; /* 1 -> drop on sight, 0 -> normal */ 137 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 138 volatile char done; /* 0->before bh, 1->before read, 2->read */ 139 } Sg_request; 140 141 typedef struct sg_fd { /* holds the state of a file descriptor */ 142 struct sg_fd *nextfp; /* NULL when last opened fd on this device */ 143 struct sg_device *parentdp; /* owning device */ 144 wait_queue_head_t read_wait; /* queue read until command done */ 145 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 146 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 147 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 148 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 149 unsigned save_scat_len; /* original length of trunc. scat. element */ 150 Sg_request *headrp; /* head of request slist, NULL->empty */ 151 struct fasync_struct *async_qp; /* used by asynchronous notification */ 152 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 153 char low_dma; /* as in parent but possibly overridden to 1 */ 154 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 155 volatile char closed; /* 1 -> fd closed but request(s) outstanding */ 156 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 157 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ 158 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 159 char mmap_called; /* 0 -> mmap() never called on this fd */ 160 } Sg_fd; 161 162 typedef struct sg_device { /* holds the state of each scsi generic device */ 163 struct scsi_device *device; 164 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ 165 int sg_tablesize; /* adapter's max scatter-gather table size */ 166 Sg_fd *headfp; /* first open fd belonging to this device */ 167 volatile char detached; /* 0->attached, 1->detached pending removal */ 168 volatile char exclude; /* opened for exclusive access */ 169 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 170 struct gendisk *disk; 171 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 172 } Sg_device; 173 174 static int sg_fasync(int fd, struct file *filp, int mode); 175 /* tasklet or soft irq callback */ 176 static void sg_cmd_done(void *data, char *sense, int result, int resid); 177 static int sg_start_req(Sg_request * srp); 178 static void sg_finish_rem_req(Sg_request * srp); 179 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 180 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, 181 int tablesize); 182 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 183 Sg_request * srp); 184 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 185 int blocking, int read_only, Sg_request ** o_srp); 186 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 187 unsigned char *cmnd, int timeout, int blocking); 188 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 189 int wr_xf, int *countp, unsigned char __user **up); 190 static int sg_write_xfer(Sg_request * srp); 191 static int sg_read_xfer(Sg_request * srp); 192 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 193 static void sg_remove_scat(Sg_scatter_hold * schp); 194 static void sg_build_reserve(Sg_fd * sfp, int req_size); 195 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 196 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 197 static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp); 198 static void sg_page_free(struct page *page, int size); 199 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 200 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 201 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 202 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 203 static Sg_request *sg_add_request(Sg_fd * sfp); 204 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 205 static int sg_res_in_use(Sg_fd * sfp); 206 static int sg_allow_access(unsigned char opcode, char dev_type); 207 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); 208 static Sg_device *sg_get_dev(int dev); 209 #ifdef CONFIG_SCSI_PROC_FS 210 static int sg_last_dev(void); 211 #endif 212 213 static Sg_device **sg_dev_arr = NULL; 214 static int sg_dev_max; 215 static int sg_nr_dev; 216 217 #define SZ_SG_HEADER sizeof(struct sg_header) 218 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 219 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 220 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 221 222 static int 223 sg_open(struct inode *inode, struct file *filp) 224 { 225 int dev = iminor(inode); 226 int flags = filp->f_flags; 227 struct request_queue *q; 228 Sg_device *sdp; 229 Sg_fd *sfp; 230 int res; 231 int retval; 232 233 nonseekable_open(inode, filp); 234 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 235 sdp = sg_get_dev(dev); 236 if ((!sdp) || (!sdp->device)) 237 return -ENXIO; 238 if (sdp->detached) 239 return -ENODEV; 240 241 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 242 /* Prevent the device driver from vanishing while we sleep */ 243 retval = scsi_device_get(sdp->device); 244 if (retval) 245 return retval; 246 247 if (!((flags & O_NONBLOCK) || 248 scsi_block_when_processing_errors(sdp->device))) { 249 retval = -ENXIO; 250 /* we are in error recovery for this device */ 251 goto error_out; 252 } 253 254 if (flags & O_EXCL) { 255 if (O_RDONLY == (flags & O_ACCMODE)) { 256 retval = -EPERM; /* Can't lock it with read only access */ 257 goto error_out; 258 } 259 if (sdp->headfp && (flags & O_NONBLOCK)) { 260 retval = -EBUSY; 261 goto error_out; 262 } 263 res = 0; 264 __wait_event_interruptible(sdp->o_excl_wait, 265 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); 266 if (res) { 267 retval = res; /* -ERESTARTSYS because signal hit process */ 268 goto error_out; 269 } 270 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ 271 if (flags & O_NONBLOCK) { 272 retval = -EBUSY; 273 goto error_out; 274 } 275 res = 0; 276 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), 277 res); 278 if (res) { 279 retval = res; /* -ERESTARTSYS because signal hit process */ 280 goto error_out; 281 } 282 } 283 if (sdp->detached) { 284 retval = -ENODEV; 285 goto error_out; 286 } 287 if (!sdp->headfp) { /* no existing opens on this device */ 288 sdp->sgdebug = 0; 289 q = sdp->device->request_queue; 290 sdp->sg_tablesize = min(q->max_hw_segments, 291 q->max_phys_segments); 292 } 293 if ((sfp = sg_add_sfp(sdp, dev))) 294 filp->private_data = sfp; 295 else { 296 if (flags & O_EXCL) 297 sdp->exclude = 0; /* undo if error */ 298 retval = -ENOMEM; 299 goto error_out; 300 } 301 return 0; 302 303 error_out: 304 scsi_device_put(sdp->device); 305 return retval; 306 } 307 308 /* Following function was formerly called 'sg_close' */ 309 static int 310 sg_release(struct inode *inode, struct file *filp) 311 { 312 Sg_device *sdp; 313 Sg_fd *sfp; 314 315 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 316 return -ENXIO; 317 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 318 sg_fasync(-1, filp, 0); /* remove filp from async notification list */ 319 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ 320 if (!sdp->detached) { 321 scsi_device_put(sdp->device); 322 } 323 sdp->exclude = 0; 324 wake_up_interruptible(&sdp->o_excl_wait); 325 } 326 return 0; 327 } 328 329 static ssize_t 330 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 331 { 332 Sg_device *sdp; 333 Sg_fd *sfp; 334 Sg_request *srp; 335 int req_pack_id = -1; 336 sg_io_hdr_t *hp; 337 struct sg_header *old_hdr = NULL; 338 int retval = 0; 339 340 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 341 return -ENXIO; 342 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 343 sdp->disk->disk_name, (int) count)); 344 345 if (!access_ok(VERIFY_WRITE, buf, count)) 346 return -EFAULT; 347 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 348 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 349 if (!old_hdr) 350 return -ENOMEM; 351 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 352 retval = -EFAULT; 353 goto free_old_hdr; 354 } 355 if (old_hdr->reply_len < 0) { 356 if (count >= SZ_SG_IO_HDR) { 357 sg_io_hdr_t *new_hdr; 358 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 359 if (!new_hdr) { 360 retval = -ENOMEM; 361 goto free_old_hdr; 362 } 363 retval =__copy_from_user 364 (new_hdr, buf, SZ_SG_IO_HDR); 365 req_pack_id = new_hdr->pack_id; 366 kfree(new_hdr); 367 if (retval) { 368 retval = -EFAULT; 369 goto free_old_hdr; 370 } 371 } 372 } else 373 req_pack_id = old_hdr->pack_id; 374 } 375 srp = sg_get_rq_mark(sfp, req_pack_id); 376 if (!srp) { /* now wait on packet to arrive */ 377 if (sdp->detached) { 378 retval = -ENODEV; 379 goto free_old_hdr; 380 } 381 if (filp->f_flags & O_NONBLOCK) { 382 retval = -EAGAIN; 383 goto free_old_hdr; 384 } 385 while (1) { 386 retval = 0; /* following macro beats race condition */ 387 __wait_event_interruptible(sfp->read_wait, 388 (sdp->detached || 389 (srp = sg_get_rq_mark(sfp, req_pack_id))), 390 retval); 391 if (sdp->detached) { 392 retval = -ENODEV; 393 goto free_old_hdr; 394 } 395 if (0 == retval) 396 break; 397 398 /* -ERESTARTSYS as signal hit process */ 399 goto free_old_hdr; 400 } 401 } 402 if (srp->header.interface_id != '\0') { 403 retval = sg_new_read(sfp, buf, count, srp); 404 goto free_old_hdr; 405 } 406 407 hp = &srp->header; 408 if (old_hdr == NULL) { 409 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 410 if (! old_hdr) { 411 retval = -ENOMEM; 412 goto free_old_hdr; 413 } 414 } 415 memset(old_hdr, 0, SZ_SG_HEADER); 416 old_hdr->reply_len = (int) hp->timeout; 417 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 418 old_hdr->pack_id = hp->pack_id; 419 old_hdr->twelve_byte = 420 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 421 old_hdr->target_status = hp->masked_status; 422 old_hdr->host_status = hp->host_status; 423 old_hdr->driver_status = hp->driver_status; 424 if ((CHECK_CONDITION & hp->masked_status) || 425 (DRIVER_SENSE & hp->driver_status)) 426 memcpy(old_hdr->sense_buffer, srp->sense_b, 427 sizeof (old_hdr->sense_buffer)); 428 switch (hp->host_status) { 429 /* This setup of 'result' is for backward compatibility and is best 430 ignored by the user who should use target, host + driver status */ 431 case DID_OK: 432 case DID_PASSTHROUGH: 433 case DID_SOFT_ERROR: 434 old_hdr->result = 0; 435 break; 436 case DID_NO_CONNECT: 437 case DID_BUS_BUSY: 438 case DID_TIME_OUT: 439 old_hdr->result = EBUSY; 440 break; 441 case DID_BAD_TARGET: 442 case DID_ABORT: 443 case DID_PARITY: 444 case DID_RESET: 445 case DID_BAD_INTR: 446 old_hdr->result = EIO; 447 break; 448 case DID_ERROR: 449 old_hdr->result = (srp->sense_b[0] == 0 && 450 hp->masked_status == GOOD) ? 0 : EIO; 451 break; 452 default: 453 old_hdr->result = EIO; 454 break; 455 } 456 457 /* Now copy the result back to the user buffer. */ 458 if (count >= SZ_SG_HEADER) { 459 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 460 retval = -EFAULT; 461 goto free_old_hdr; 462 } 463 buf += SZ_SG_HEADER; 464 if (count > old_hdr->reply_len) 465 count = old_hdr->reply_len; 466 if (count > SZ_SG_HEADER) { 467 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 468 retval = -EFAULT; 469 goto free_old_hdr; 470 } 471 } 472 } else 473 count = (old_hdr->result == 0) ? 0 : -EIO; 474 sg_finish_rem_req(srp); 475 retval = count; 476 free_old_hdr: 477 kfree(old_hdr); 478 return retval; 479 } 480 481 static ssize_t 482 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 483 { 484 sg_io_hdr_t *hp = &srp->header; 485 int err = 0; 486 int len; 487 488 if (count < SZ_SG_IO_HDR) { 489 err = -EINVAL; 490 goto err_out; 491 } 492 hp->sb_len_wr = 0; 493 if ((hp->mx_sb_len > 0) && hp->sbp) { 494 if ((CHECK_CONDITION & hp->masked_status) || 495 (DRIVER_SENSE & hp->driver_status)) { 496 int sb_len = SCSI_SENSE_BUFFERSIZE; 497 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 498 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 499 len = (len > sb_len) ? sb_len : len; 500 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 501 err = -EFAULT; 502 goto err_out; 503 } 504 hp->sb_len_wr = len; 505 } 506 } 507 if (hp->masked_status || hp->host_status || hp->driver_status) 508 hp->info |= SG_INFO_CHECK; 509 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 510 err = -EFAULT; 511 goto err_out; 512 } 513 err = sg_read_xfer(srp); 514 err_out: 515 sg_finish_rem_req(srp); 516 return (0 == err) ? count : err; 517 } 518 519 static ssize_t 520 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 521 { 522 int mxsize, cmd_size, k; 523 int input_size, blocking; 524 unsigned char opcode; 525 Sg_device *sdp; 526 Sg_fd *sfp; 527 Sg_request *srp; 528 struct sg_header old_hdr; 529 sg_io_hdr_t *hp; 530 unsigned char cmnd[MAX_COMMAND_SIZE]; 531 532 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 533 return -ENXIO; 534 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 535 sdp->disk->disk_name, (int) count)); 536 if (sdp->detached) 537 return -ENODEV; 538 if (!((filp->f_flags & O_NONBLOCK) || 539 scsi_block_when_processing_errors(sdp->device))) 540 return -ENXIO; 541 542 if (!access_ok(VERIFY_READ, buf, count)) 543 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 544 if (count < SZ_SG_HEADER) 545 return -EIO; 546 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 547 return -EFAULT; 548 blocking = !(filp->f_flags & O_NONBLOCK); 549 if (old_hdr.reply_len < 0) 550 return sg_new_write(sfp, buf, count, blocking, 0, NULL); 551 if (count < (SZ_SG_HEADER + 6)) 552 return -EIO; /* The minimum scsi command length is 6 bytes. */ 553 554 if (!(srp = sg_add_request(sfp))) { 555 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 556 return -EDOM; 557 } 558 buf += SZ_SG_HEADER; 559 __get_user(opcode, buf); 560 if (sfp->next_cmd_len > 0) { 561 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 562 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 563 sfp->next_cmd_len = 0; 564 sg_remove_request(sfp, srp); 565 return -EIO; 566 } 567 cmd_size = sfp->next_cmd_len; 568 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 569 } else { 570 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 571 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 572 cmd_size = 12; 573 } 574 SCSI_LOG_TIMEOUT(4, printk( 575 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 576 /* Determine buffer size. */ 577 input_size = count - cmd_size; 578 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 579 mxsize -= SZ_SG_HEADER; 580 input_size -= SZ_SG_HEADER; 581 if (input_size < 0) { 582 sg_remove_request(sfp, srp); 583 return -EIO; /* User did not pass enough bytes for this command. */ 584 } 585 hp = &srp->header; 586 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 587 hp->cmd_len = (unsigned char) cmd_size; 588 hp->iovec_count = 0; 589 hp->mx_sb_len = 0; 590 if (input_size > 0) 591 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 592 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 593 else 594 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 595 hp->dxfer_len = mxsize; 596 hp->dxferp = (char __user *)buf + cmd_size; 597 hp->sbp = NULL; 598 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 599 hp->flags = input_size; /* structure abuse ... */ 600 hp->pack_id = old_hdr.pack_id; 601 hp->usr_ptr = NULL; 602 if (__copy_from_user(cmnd, buf, cmd_size)) 603 return -EFAULT; 604 /* 605 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 606 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 607 * is a non-zero input_size, so emit a warning. 608 */ 609 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) 610 if (printk_ratelimit()) 611 printk(KERN_WARNING 612 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" 613 "guessing data in;\n" KERN_WARNING " " 614 "program %s not setting count and/or reply_len properly\n", 615 old_hdr.reply_len - (int)SZ_SG_HEADER, 616 input_size, (unsigned int) cmnd[0], 617 current->comm); 618 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 619 return (k < 0) ? k : count; 620 } 621 622 static ssize_t 623 sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 624 int blocking, int read_only, Sg_request ** o_srp) 625 { 626 int k; 627 Sg_request *srp; 628 sg_io_hdr_t *hp; 629 unsigned char cmnd[MAX_COMMAND_SIZE]; 630 int timeout; 631 unsigned long ul_timeout; 632 633 if (count < SZ_SG_IO_HDR) 634 return -EINVAL; 635 if (!access_ok(VERIFY_READ, buf, count)) 636 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 637 638 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 639 if (!(srp = sg_add_request(sfp))) { 640 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 641 return -EDOM; 642 } 643 hp = &srp->header; 644 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 645 sg_remove_request(sfp, srp); 646 return -EFAULT; 647 } 648 if (hp->interface_id != 'S') { 649 sg_remove_request(sfp, srp); 650 return -ENOSYS; 651 } 652 if (hp->flags & SG_FLAG_MMAP_IO) { 653 if (hp->dxfer_len > sfp->reserve.bufflen) { 654 sg_remove_request(sfp, srp); 655 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 656 } 657 if (hp->flags & SG_FLAG_DIRECT_IO) { 658 sg_remove_request(sfp, srp); 659 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 660 } 661 if (sg_res_in_use(sfp)) { 662 sg_remove_request(sfp, srp); 663 return -EBUSY; /* reserve buffer already being used */ 664 } 665 } 666 ul_timeout = msecs_to_jiffies(srp->header.timeout); 667 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 668 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 669 sg_remove_request(sfp, srp); 670 return -EMSGSIZE; 671 } 672 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 673 sg_remove_request(sfp, srp); 674 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 675 } 676 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 677 sg_remove_request(sfp, srp); 678 return -EFAULT; 679 } 680 if (read_only && 681 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) { 682 sg_remove_request(sfp, srp); 683 return -EPERM; 684 } 685 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 686 if (k < 0) 687 return k; 688 if (o_srp) 689 *o_srp = srp; 690 return count; 691 } 692 693 static int 694 sg_common_write(Sg_fd * sfp, Sg_request * srp, 695 unsigned char *cmnd, int timeout, int blocking) 696 { 697 int k, data_dir; 698 Sg_device *sdp = sfp->parentdp; 699 sg_io_hdr_t *hp = &srp->header; 700 701 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 702 hp->status = 0; 703 hp->masked_status = 0; 704 hp->msg_status = 0; 705 hp->info = 0; 706 hp->host_status = 0; 707 hp->driver_status = 0; 708 hp->resid = 0; 709 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 710 (int) cmnd[0], (int) hp->cmd_len)); 711 712 if ((k = sg_start_req(srp))) { 713 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); 714 sg_finish_rem_req(srp); 715 return k; /* probably out of space --> ENOMEM */ 716 } 717 if ((k = sg_write_xfer(srp))) { 718 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n")); 719 sg_finish_rem_req(srp); 720 return k; 721 } 722 if (sdp->detached) { 723 sg_finish_rem_req(srp); 724 return -ENODEV; 725 } 726 727 switch (hp->dxfer_direction) { 728 case SG_DXFER_TO_FROM_DEV: 729 case SG_DXFER_FROM_DEV: 730 data_dir = DMA_FROM_DEVICE; 731 break; 732 case SG_DXFER_TO_DEV: 733 data_dir = DMA_TO_DEVICE; 734 break; 735 case SG_DXFER_UNKNOWN: 736 data_dir = DMA_BIDIRECTIONAL; 737 break; 738 default: 739 data_dir = DMA_NONE; 740 break; 741 } 742 hp->duration = jiffies_to_msecs(jiffies); 743 /* Now send everything of to mid-level. The next time we hear about this 744 packet is when sg_cmd_done() is called (i.e. a callback). */ 745 if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer, 746 hp->dxfer_len, srp->data.k_use_sg, timeout, 747 SG_DEFAULT_RETRIES, srp, sg_cmd_done, 748 GFP_ATOMIC)) { 749 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n")); 750 /* 751 * most likely out of mem, but could also be a bad map 752 */ 753 sg_finish_rem_req(srp); 754 return -ENOMEM; 755 } else 756 return 0; 757 } 758 759 static int 760 sg_srp_done(Sg_request *srp, Sg_fd *sfp) 761 { 762 unsigned long iflags; 763 int done; 764 765 read_lock_irqsave(&sfp->rq_list_lock, iflags); 766 done = srp->done; 767 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 768 return done; 769 } 770 771 static int 772 sg_ioctl(struct inode *inode, struct file *filp, 773 unsigned int cmd_in, unsigned long arg) 774 { 775 void __user *p = (void __user *)arg; 776 int __user *ip = p; 777 int result, val, read_only; 778 Sg_device *sdp; 779 Sg_fd *sfp; 780 Sg_request *srp; 781 unsigned long iflags; 782 783 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 784 return -ENXIO; 785 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 786 sdp->disk->disk_name, (int) cmd_in)); 787 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 788 789 switch (cmd_in) { 790 case SG_IO: 791 { 792 int blocking = 1; /* ignore O_NONBLOCK flag */ 793 794 if (sdp->detached) 795 return -ENODEV; 796 if (!scsi_block_when_processing_errors(sdp->device)) 797 return -ENXIO; 798 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 799 return -EFAULT; 800 result = 801 sg_new_write(sfp, p, SZ_SG_IO_HDR, 802 blocking, read_only, &srp); 803 if (result < 0) 804 return result; 805 srp->sg_io_owned = 1; 806 while (1) { 807 result = 0; /* following macro to beat race condition */ 808 __wait_event_interruptible(sfp->read_wait, 809 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), 810 result); 811 if (sdp->detached) 812 return -ENODEV; 813 if (sfp->closed) 814 return 0; /* request packet dropped already */ 815 if (0 == result) 816 break; 817 srp->orphan = 1; 818 return result; /* -ERESTARTSYS because signal hit process */ 819 } 820 write_lock_irqsave(&sfp->rq_list_lock, iflags); 821 srp->done = 2; 822 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 823 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 824 return (result < 0) ? result : 0; 825 } 826 case SG_SET_TIMEOUT: 827 result = get_user(val, ip); 828 if (result) 829 return result; 830 if (val < 0) 831 return -EIO; 832 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 833 val = MULDIV (INT_MAX, USER_HZ, HZ); 834 sfp->timeout_user = val; 835 sfp->timeout = MULDIV (val, HZ, USER_HZ); 836 837 return 0; 838 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 839 /* strange ..., for backward compatibility */ 840 return sfp->timeout_user; 841 case SG_SET_FORCE_LOW_DMA: 842 result = get_user(val, ip); 843 if (result) 844 return result; 845 if (val) { 846 sfp->low_dma = 1; 847 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 848 val = (int) sfp->reserve.bufflen; 849 sg_remove_scat(&sfp->reserve); 850 sg_build_reserve(sfp, val); 851 } 852 } else { 853 if (sdp->detached) 854 return -ENODEV; 855 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 856 } 857 return 0; 858 case SG_GET_LOW_DMA: 859 return put_user((int) sfp->low_dma, ip); 860 case SG_GET_SCSI_ID: 861 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 862 return -EFAULT; 863 else { 864 sg_scsi_id_t __user *sg_idp = p; 865 866 if (sdp->detached) 867 return -ENODEV; 868 __put_user((int) sdp->device->host->host_no, 869 &sg_idp->host_no); 870 __put_user((int) sdp->device->channel, 871 &sg_idp->channel); 872 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 873 __put_user((int) sdp->device->lun, &sg_idp->lun); 874 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 875 __put_user((short) sdp->device->host->cmd_per_lun, 876 &sg_idp->h_cmd_per_lun); 877 __put_user((short) sdp->device->queue_depth, 878 &sg_idp->d_queue_depth); 879 __put_user(0, &sg_idp->unused[0]); 880 __put_user(0, &sg_idp->unused[1]); 881 return 0; 882 } 883 case SG_SET_FORCE_PACK_ID: 884 result = get_user(val, ip); 885 if (result) 886 return result; 887 sfp->force_packid = val ? 1 : 0; 888 return 0; 889 case SG_GET_PACK_ID: 890 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 891 return -EFAULT; 892 read_lock_irqsave(&sfp->rq_list_lock, iflags); 893 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 894 if ((1 == srp->done) && (!srp->sg_io_owned)) { 895 read_unlock_irqrestore(&sfp->rq_list_lock, 896 iflags); 897 __put_user(srp->header.pack_id, ip); 898 return 0; 899 } 900 } 901 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 902 __put_user(-1, ip); 903 return 0; 904 case SG_GET_NUM_WAITING: 905 read_lock_irqsave(&sfp->rq_list_lock, iflags); 906 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 907 if ((1 == srp->done) && (!srp->sg_io_owned)) 908 ++val; 909 } 910 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 911 return put_user(val, ip); 912 case SG_GET_SG_TABLESIZE: 913 return put_user(sdp->sg_tablesize, ip); 914 case SG_SET_RESERVED_SIZE: 915 result = get_user(val, ip); 916 if (result) 917 return result; 918 if (val < 0) 919 return -EINVAL; 920 val = min_t(int, val, 921 sdp->device->request_queue->max_sectors * 512); 922 if (val != sfp->reserve.bufflen) { 923 if (sg_res_in_use(sfp) || sfp->mmap_called) 924 return -EBUSY; 925 sg_remove_scat(&sfp->reserve); 926 sg_build_reserve(sfp, val); 927 } 928 return 0; 929 case SG_GET_RESERVED_SIZE: 930 val = min_t(int, sfp->reserve.bufflen, 931 sdp->device->request_queue->max_sectors * 512); 932 return put_user(val, ip); 933 case SG_SET_COMMAND_Q: 934 result = get_user(val, ip); 935 if (result) 936 return result; 937 sfp->cmd_q = val ? 1 : 0; 938 return 0; 939 case SG_GET_COMMAND_Q: 940 return put_user((int) sfp->cmd_q, ip); 941 case SG_SET_KEEP_ORPHAN: 942 result = get_user(val, ip); 943 if (result) 944 return result; 945 sfp->keep_orphan = val; 946 return 0; 947 case SG_GET_KEEP_ORPHAN: 948 return put_user((int) sfp->keep_orphan, ip); 949 case SG_NEXT_CMD_LEN: 950 result = get_user(val, ip); 951 if (result) 952 return result; 953 sfp->next_cmd_len = (val > 0) ? val : 0; 954 return 0; 955 case SG_GET_VERSION_NUM: 956 return put_user(sg_version_num, ip); 957 case SG_GET_ACCESS_COUNT: 958 /* faked - we don't have a real access count anymore */ 959 val = (sdp->device ? 1 : 0); 960 return put_user(val, ip); 961 case SG_GET_REQUEST_TABLE: 962 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 963 return -EFAULT; 964 else { 965 sg_req_info_t *rinfo; 966 unsigned int ms; 967 968 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 969 GFP_KERNEL); 970 if (!rinfo) 971 return -ENOMEM; 972 read_lock_irqsave(&sfp->rq_list_lock, iflags); 973 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 974 ++val, srp = srp ? srp->nextrp : srp) { 975 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 976 if (srp) { 977 rinfo[val].req_state = srp->done + 1; 978 rinfo[val].problem = 979 srp->header.masked_status & 980 srp->header.host_status & 981 srp->header.driver_status; 982 if (srp->done) 983 rinfo[val].duration = 984 srp->header.duration; 985 else { 986 ms = jiffies_to_msecs(jiffies); 987 rinfo[val].duration = 988 (ms > srp->header.duration) ? 989 (ms - srp->header.duration) : 0; 990 } 991 rinfo[val].orphan = srp->orphan; 992 rinfo[val].sg_io_owned = 993 srp->sg_io_owned; 994 rinfo[val].pack_id = 995 srp->header.pack_id; 996 rinfo[val].usr_ptr = 997 srp->header.usr_ptr; 998 } 999 } 1000 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1001 result = __copy_to_user(p, rinfo, 1002 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 1003 result = result ? -EFAULT : 0; 1004 kfree(rinfo); 1005 return result; 1006 } 1007 case SG_EMULATED_HOST: 1008 if (sdp->detached) 1009 return -ENODEV; 1010 return put_user(sdp->device->host->hostt->emulated, ip); 1011 case SG_SCSI_RESET: 1012 if (sdp->detached) 1013 return -ENODEV; 1014 if (filp->f_flags & O_NONBLOCK) { 1015 if (scsi_host_in_recovery(sdp->device->host)) 1016 return -EBUSY; 1017 } else if (!scsi_block_when_processing_errors(sdp->device)) 1018 return -EBUSY; 1019 result = get_user(val, ip); 1020 if (result) 1021 return result; 1022 if (SG_SCSI_RESET_NOTHING == val) 1023 return 0; 1024 switch (val) { 1025 case SG_SCSI_RESET_DEVICE: 1026 val = SCSI_TRY_RESET_DEVICE; 1027 break; 1028 case SG_SCSI_RESET_BUS: 1029 val = SCSI_TRY_RESET_BUS; 1030 break; 1031 case SG_SCSI_RESET_HOST: 1032 val = SCSI_TRY_RESET_HOST; 1033 break; 1034 default: 1035 return -EINVAL; 1036 } 1037 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1038 return -EACCES; 1039 return (scsi_reset_provider(sdp->device, val) == 1040 SUCCESS) ? 0 : -EIO; 1041 case SCSI_IOCTL_SEND_COMMAND: 1042 if (sdp->detached) 1043 return -ENODEV; 1044 if (read_only) { 1045 unsigned char opcode = WRITE_6; 1046 Scsi_Ioctl_Command __user *siocp = p; 1047 1048 if (copy_from_user(&opcode, siocp->data, 1)) 1049 return -EFAULT; 1050 if (!sg_allow_access(opcode, sdp->device->type)) 1051 return -EPERM; 1052 } 1053 return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p); 1054 case SG_SET_DEBUG: 1055 result = get_user(val, ip); 1056 if (result) 1057 return result; 1058 sdp->sgdebug = (char) val; 1059 return 0; 1060 case SCSI_IOCTL_GET_IDLUN: 1061 case SCSI_IOCTL_GET_BUS_NUMBER: 1062 case SCSI_IOCTL_PROBE_HOST: 1063 case SG_GET_TRANSFORM: 1064 if (sdp->detached) 1065 return -ENODEV; 1066 return scsi_ioctl(sdp->device, cmd_in, p); 1067 case BLKSECTGET: 1068 return put_user(sdp->device->request_queue->max_sectors * 512, 1069 ip); 1070 default: 1071 if (read_only) 1072 return -EPERM; /* don't know so take safe approach */ 1073 return scsi_ioctl(sdp->device, cmd_in, p); 1074 } 1075 } 1076 1077 #ifdef CONFIG_COMPAT 1078 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1079 { 1080 Sg_device *sdp; 1081 Sg_fd *sfp; 1082 struct scsi_device *sdev; 1083 1084 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1085 return -ENXIO; 1086 1087 sdev = sdp->device; 1088 if (sdev->host->hostt->compat_ioctl) { 1089 int ret; 1090 1091 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1092 1093 return ret; 1094 } 1095 1096 return -ENOIOCTLCMD; 1097 } 1098 #endif 1099 1100 static unsigned int 1101 sg_poll(struct file *filp, poll_table * wait) 1102 { 1103 unsigned int res = 0; 1104 Sg_device *sdp; 1105 Sg_fd *sfp; 1106 Sg_request *srp; 1107 int count = 0; 1108 unsigned long iflags; 1109 1110 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) 1111 || sfp->closed) 1112 return POLLERR; 1113 poll_wait(filp, &sfp->read_wait, wait); 1114 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1115 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1116 /* if any read waiting, flag it */ 1117 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1118 res = POLLIN | POLLRDNORM; 1119 ++count; 1120 } 1121 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1122 1123 if (sdp->detached) 1124 res |= POLLHUP; 1125 else if (!sfp->cmd_q) { 1126 if (0 == count) 1127 res |= POLLOUT | POLLWRNORM; 1128 } else if (count < SG_MAX_QUEUE) 1129 res |= POLLOUT | POLLWRNORM; 1130 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1131 sdp->disk->disk_name, (int) res)); 1132 return res; 1133 } 1134 1135 static int 1136 sg_fasync(int fd, struct file *filp, int mode) 1137 { 1138 int retval; 1139 Sg_device *sdp; 1140 Sg_fd *sfp; 1141 1142 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1143 return -ENXIO; 1144 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1145 sdp->disk->disk_name, mode)); 1146 1147 retval = fasync_helper(fd, filp, mode, &sfp->async_qp); 1148 return (retval < 0) ? retval : 0; 1149 } 1150 1151 static struct page * 1152 sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type) 1153 { 1154 Sg_fd *sfp; 1155 struct page *page = NOPAGE_SIGBUS; 1156 unsigned long offset, len, sa; 1157 Sg_scatter_hold *rsv_schp; 1158 struct scatterlist *sg; 1159 int k; 1160 1161 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1162 return page; 1163 rsv_schp = &sfp->reserve; 1164 offset = addr - vma->vm_start; 1165 if (offset >= rsv_schp->bufflen) 1166 return page; 1167 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n", 1168 offset, rsv_schp->k_use_sg)); 1169 sg = rsv_schp->buffer; 1170 sa = vma->vm_start; 1171 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1172 ++k, ++sg) { 1173 len = vma->vm_end - sa; 1174 len = (len < sg->length) ? len : sg->length; 1175 if (offset < len) { 1176 page = virt_to_page(page_address(sg->page) + offset); 1177 get_page(page); /* increment page count */ 1178 break; 1179 } 1180 sa += len; 1181 offset -= len; 1182 } 1183 1184 if (type) 1185 *type = VM_FAULT_MINOR; 1186 return page; 1187 } 1188 1189 static struct vm_operations_struct sg_mmap_vm_ops = { 1190 .nopage = sg_vma_nopage, 1191 }; 1192 1193 static int 1194 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1195 { 1196 Sg_fd *sfp; 1197 unsigned long req_sz, len, sa; 1198 Sg_scatter_hold *rsv_schp; 1199 int k; 1200 struct scatterlist *sg; 1201 1202 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1203 return -ENXIO; 1204 req_sz = vma->vm_end - vma->vm_start; 1205 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1206 (void *) vma->vm_start, (int) req_sz)); 1207 if (vma->vm_pgoff) 1208 return -EINVAL; /* want no offset */ 1209 rsv_schp = &sfp->reserve; 1210 if (req_sz > rsv_schp->bufflen) 1211 return -ENOMEM; /* cannot map more than reserved buffer */ 1212 1213 sa = vma->vm_start; 1214 sg = rsv_schp->buffer; 1215 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1216 ++k, ++sg) { 1217 len = vma->vm_end - sa; 1218 len = (len < sg->length) ? len : sg->length; 1219 sa += len; 1220 } 1221 1222 sfp->mmap_called = 1; 1223 vma->vm_flags |= VM_RESERVED; 1224 vma->vm_private_data = sfp; 1225 vma->vm_ops = &sg_mmap_vm_ops; 1226 return 0; 1227 } 1228 1229 /* This function is a "bottom half" handler that is called by the 1230 * mid level when a command is completed (or has failed). */ 1231 static void 1232 sg_cmd_done(void *data, char *sense, int result, int resid) 1233 { 1234 Sg_request *srp = data; 1235 Sg_device *sdp = NULL; 1236 Sg_fd *sfp; 1237 unsigned long iflags; 1238 unsigned int ms; 1239 1240 if (NULL == srp) { 1241 printk(KERN_ERR "sg_cmd_done: NULL request\n"); 1242 return; 1243 } 1244 sfp = srp->parentfp; 1245 if (sfp) 1246 sdp = sfp->parentdp; 1247 if ((NULL == sdp) || sdp->detached) { 1248 printk(KERN_INFO "sg_cmd_done: device detached\n"); 1249 return; 1250 } 1251 1252 1253 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1254 sdp->disk->disk_name, srp->header.pack_id, result)); 1255 srp->header.resid = resid; 1256 ms = jiffies_to_msecs(jiffies); 1257 srp->header.duration = (ms > srp->header.duration) ? 1258 (ms - srp->header.duration) : 0; 1259 if (0 != result) { 1260 struct scsi_sense_hdr sshdr; 1261 1262 memcpy(srp->sense_b, sense, sizeof (srp->sense_b)); 1263 srp->header.status = 0xff & result; 1264 srp->header.masked_status = status_byte(result); 1265 srp->header.msg_status = msg_byte(result); 1266 srp->header.host_status = host_byte(result); 1267 srp->header.driver_status = driver_byte(result); 1268 if ((sdp->sgdebug > 0) && 1269 ((CHECK_CONDITION == srp->header.masked_status) || 1270 (COMMAND_TERMINATED == srp->header.masked_status))) 1271 __scsi_print_sense("sg_cmd_done", sense, 1272 SCSI_SENSE_BUFFERSIZE); 1273 1274 /* Following if statement is a patch supplied by Eric Youngdale */ 1275 if (driver_byte(result) != 0 1276 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1277 && !scsi_sense_is_deferred(&sshdr) 1278 && sshdr.sense_key == UNIT_ATTENTION 1279 && sdp->device->removable) { 1280 /* Detected possible disc change. Set the bit - this */ 1281 /* may be used if there are filesystems using this device */ 1282 sdp->device->changed = 1; 1283 } 1284 } 1285 /* Rely on write phase to clean out srp status values, so no "else" */ 1286 1287 if (sfp->closed) { /* whoops this fd already released, cleanup */ 1288 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); 1289 sg_finish_rem_req(srp); 1290 srp = NULL; 1291 if (NULL == sfp->headrp) { 1292 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n")); 1293 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ 1294 scsi_device_put(sdp->device); 1295 } 1296 sfp = NULL; 1297 } 1298 } else if (srp && srp->orphan) { 1299 if (sfp->keep_orphan) 1300 srp->sg_io_owned = 0; 1301 else { 1302 sg_finish_rem_req(srp); 1303 srp = NULL; 1304 } 1305 } 1306 if (sfp && srp) { 1307 /* Now wake up any sg_read() that is waiting for this packet. */ 1308 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1309 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1310 srp->done = 1; 1311 wake_up_interruptible(&sfp->read_wait); 1312 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1313 } 1314 } 1315 1316 static struct file_operations sg_fops = { 1317 .owner = THIS_MODULE, 1318 .read = sg_read, 1319 .write = sg_write, 1320 .poll = sg_poll, 1321 .ioctl = sg_ioctl, 1322 #ifdef CONFIG_COMPAT 1323 .compat_ioctl = sg_compat_ioctl, 1324 #endif 1325 .open = sg_open, 1326 .mmap = sg_mmap, 1327 .release = sg_release, 1328 .fasync = sg_fasync, 1329 }; 1330 1331 static struct class *sg_sysfs_class; 1332 1333 static int sg_sysfs_valid = 0; 1334 1335 static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1336 { 1337 struct request_queue *q = scsidp->request_queue; 1338 Sg_device *sdp; 1339 unsigned long iflags; 1340 void *old_sg_dev_arr = NULL; 1341 int k, error; 1342 1343 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1344 if (!sdp) { 1345 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1346 return -ENOMEM; 1347 } 1348 1349 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1350 if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */ 1351 Sg_device **tmp_da; 1352 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP; 1353 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1354 1355 tmp_da = kzalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL); 1356 if (unlikely(!tmp_da)) 1357 goto expand_failed; 1358 1359 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1360 memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *)); 1361 old_sg_dev_arr = sg_dev_arr; 1362 sg_dev_arr = tmp_da; 1363 sg_dev_max = tmp_dev_max; 1364 } 1365 1366 for (k = 0; k < sg_dev_max; k++) 1367 if (!sg_dev_arr[k]) 1368 break; 1369 if (unlikely(k >= SG_MAX_DEVS)) 1370 goto overflow; 1371 1372 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1373 sprintf(disk->disk_name, "sg%d", k); 1374 disk->first_minor = k; 1375 sdp->disk = disk; 1376 sdp->device = scsidp; 1377 init_waitqueue_head(&sdp->o_excl_wait); 1378 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments); 1379 1380 sg_nr_dev++; 1381 sg_dev_arr[k] = sdp; 1382 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1383 error = k; 1384 1385 out: 1386 if (error < 0) 1387 kfree(sdp); 1388 kfree(old_sg_dev_arr); 1389 return error; 1390 1391 expand_failed: 1392 printk(KERN_WARNING "sg_alloc: device array cannot be resized\n"); 1393 error = -ENOMEM; 1394 goto out; 1395 1396 overflow: 1397 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1398 sdev_printk(KERN_WARNING, scsidp, 1399 "Unable to attach sg device type=%d, minor " 1400 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); 1401 error = -ENODEV; 1402 goto out; 1403 } 1404 1405 static int 1406 sg_add(struct class_device *cl_dev, struct class_interface *cl_intf) 1407 { 1408 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); 1409 struct gendisk *disk; 1410 Sg_device *sdp = NULL; 1411 struct cdev * cdev = NULL; 1412 int error, k; 1413 unsigned long iflags; 1414 1415 disk = alloc_disk(1); 1416 if (!disk) { 1417 printk(KERN_WARNING "alloc_disk failed\n"); 1418 return -ENOMEM; 1419 } 1420 disk->major = SCSI_GENERIC_MAJOR; 1421 1422 error = -ENOMEM; 1423 cdev = cdev_alloc(); 1424 if (!cdev) { 1425 printk(KERN_WARNING "cdev_alloc failed\n"); 1426 goto out; 1427 } 1428 cdev->owner = THIS_MODULE; 1429 cdev->ops = &sg_fops; 1430 1431 error = sg_alloc(disk, scsidp); 1432 if (error < 0) { 1433 printk(KERN_WARNING "sg_alloc failed\n"); 1434 goto out; 1435 } 1436 k = error; 1437 sdp = sg_dev_arr[k]; 1438 1439 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1); 1440 if (error) 1441 goto cdev_add_err; 1442 1443 sdp->cdev = cdev; 1444 if (sg_sysfs_valid) { 1445 struct class_device * sg_class_member; 1446 1447 sg_class_member = class_device_create(sg_sysfs_class, NULL, 1448 MKDEV(SCSI_GENERIC_MAJOR, k), 1449 cl_dev->dev, "%s", 1450 disk->disk_name); 1451 if (IS_ERR(sg_class_member)) 1452 printk(KERN_WARNING "sg_add: " 1453 "class_device_create failed\n"); 1454 class_set_devdata(sg_class_member, sdp); 1455 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1456 &sg_class_member->kobj, "generic"); 1457 if (error) 1458 printk(KERN_ERR "sg_add: unable to make symlink " 1459 "'generic' back to sg%d\n", k); 1460 } else 1461 printk(KERN_WARNING "sg_add: sg_sys INvalid\n"); 1462 1463 sdev_printk(KERN_NOTICE, scsidp, 1464 "Attached scsi generic sg%d type %d\n", k,scsidp->type); 1465 1466 return 0; 1467 1468 cdev_add_err: 1469 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1470 kfree(sg_dev_arr[k]); 1471 sg_dev_arr[k] = NULL; 1472 sg_nr_dev--; 1473 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1474 1475 out: 1476 put_disk(disk); 1477 if (cdev) 1478 cdev_del(cdev); 1479 return error; 1480 } 1481 1482 static void 1483 sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf) 1484 { 1485 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); 1486 Sg_device *sdp = NULL; 1487 unsigned long iflags; 1488 Sg_fd *sfp; 1489 Sg_fd *tsfp; 1490 Sg_request *srp; 1491 Sg_request *tsrp; 1492 int k, delay; 1493 1494 if (NULL == sg_dev_arr) 1495 return; 1496 delay = 0; 1497 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1498 for (k = 0; k < sg_dev_max; k++) { 1499 sdp = sg_dev_arr[k]; 1500 if ((NULL == sdp) || (sdp->device != scsidp)) 1501 continue; /* dirty but lowers nesting */ 1502 if (sdp->headfp) { 1503 sdp->detached = 1; 1504 for (sfp = sdp->headfp; sfp; sfp = tsfp) { 1505 tsfp = sfp->nextfp; 1506 for (srp = sfp->headrp; srp; srp = tsrp) { 1507 tsrp = srp->nextrp; 1508 if (sfp->closed || (0 == sg_srp_done(srp, sfp))) 1509 sg_finish_rem_req(srp); 1510 } 1511 if (sfp->closed) { 1512 scsi_device_put(sdp->device); 1513 __sg_remove_sfp(sdp, sfp); 1514 } else { 1515 delay = 1; 1516 wake_up_interruptible(&sfp->read_wait); 1517 kill_fasync(&sfp->async_qp, SIGPOLL, 1518 POLL_HUP); 1519 } 1520 } 1521 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", k)); 1522 if (NULL == sdp->headfp) { 1523 sg_dev_arr[k] = NULL; 1524 } 1525 } else { /* nothing active, simple case */ 1526 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", k)); 1527 sg_dev_arr[k] = NULL; 1528 } 1529 sg_nr_dev--; 1530 break; 1531 } 1532 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1533 1534 if (sdp) { 1535 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1536 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k)); 1537 cdev_del(sdp->cdev); 1538 sdp->cdev = NULL; 1539 put_disk(sdp->disk); 1540 sdp->disk = NULL; 1541 if (NULL == sdp->headfp) 1542 kfree((char *) sdp); 1543 } 1544 1545 if (delay) 1546 msleep(10); /* dirty detach so delay device destruction */ 1547 } 1548 1549 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1550 module_param_named(def_reserved_size, def_reserved_size, int, 1551 S_IRUGO | S_IWUSR); 1552 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1553 1554 MODULE_AUTHOR("Douglas Gilbert"); 1555 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1556 MODULE_LICENSE("GPL"); 1557 MODULE_VERSION(SG_VERSION_STR); 1558 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1559 1560 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1561 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1562 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1563 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1564 1565 static int __init 1566 init_sg(void) 1567 { 1568 int rc; 1569 1570 if (scatter_elem_sz < PAGE_SIZE) { 1571 scatter_elem_sz = PAGE_SIZE; 1572 scatter_elem_sz_prev = scatter_elem_sz; 1573 } 1574 if (def_reserved_size >= 0) 1575 sg_big_buff = def_reserved_size; 1576 else 1577 def_reserved_size = sg_big_buff; 1578 1579 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1580 SG_MAX_DEVS, "sg"); 1581 if (rc) 1582 return rc; 1583 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1584 if ( IS_ERR(sg_sysfs_class) ) { 1585 rc = PTR_ERR(sg_sysfs_class); 1586 goto err_out; 1587 } 1588 sg_sysfs_valid = 1; 1589 rc = scsi_register_interface(&sg_interface); 1590 if (0 == rc) { 1591 #ifdef CONFIG_SCSI_PROC_FS 1592 sg_proc_init(); 1593 #endif /* CONFIG_SCSI_PROC_FS */ 1594 return 0; 1595 } 1596 class_destroy(sg_sysfs_class); 1597 err_out: 1598 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1599 return rc; 1600 } 1601 1602 static void __exit 1603 exit_sg(void) 1604 { 1605 #ifdef CONFIG_SCSI_PROC_FS 1606 sg_proc_cleanup(); 1607 #endif /* CONFIG_SCSI_PROC_FS */ 1608 scsi_unregister_interface(&sg_interface); 1609 class_destroy(sg_sysfs_class); 1610 sg_sysfs_valid = 0; 1611 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1612 SG_MAX_DEVS); 1613 kfree((char *)sg_dev_arr); 1614 sg_dev_arr = NULL; 1615 sg_dev_max = 0; 1616 } 1617 1618 static int 1619 sg_start_req(Sg_request * srp) 1620 { 1621 int res; 1622 Sg_fd *sfp = srp->parentfp; 1623 sg_io_hdr_t *hp = &srp->header; 1624 int dxfer_len = (int) hp->dxfer_len; 1625 int dxfer_dir = hp->dxfer_direction; 1626 Sg_scatter_hold *req_schp = &srp->data; 1627 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1628 1629 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); 1630 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1631 return 0; 1632 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && 1633 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && 1634 (!sfp->parentdp->device->host->unchecked_isa_dma)) { 1635 res = sg_build_direct(srp, sfp, dxfer_len); 1636 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ 1637 return res; 1638 } 1639 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) 1640 sg_link_reserve(sfp, srp, dxfer_len); 1641 else { 1642 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1643 if (res) { 1644 sg_remove_scat(req_schp); 1645 return res; 1646 } 1647 } 1648 return 0; 1649 } 1650 1651 static void 1652 sg_finish_rem_req(Sg_request * srp) 1653 { 1654 Sg_fd *sfp = srp->parentfp; 1655 Sg_scatter_hold *req_schp = &srp->data; 1656 1657 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1658 if (srp->res_used) 1659 sg_unlink_reserve(sfp, srp); 1660 else 1661 sg_remove_scat(req_schp); 1662 sg_remove_request(sfp, srp); 1663 } 1664 1665 static int 1666 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1667 { 1668 int sg_bufflen = tablesize * sizeof(struct scatterlist); 1669 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1670 1671 /* 1672 * TODO: test without low_dma, we should not need it since 1673 * the block layer will bounce the buffer for us 1674 * 1675 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list. 1676 */ 1677 if (sfp->low_dma) 1678 gfp_flags |= GFP_DMA; 1679 schp->buffer = kzalloc(sg_bufflen, gfp_flags); 1680 if (!schp->buffer) 1681 return -ENOMEM; 1682 schp->sglist_len = sg_bufflen; 1683 return tablesize; /* number of scat_gath elements allocated */ 1684 } 1685 1686 #ifdef SG_ALLOW_DIO_CODE 1687 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ 1688 /* TODO: hopefully we can use the generic block layer code */ 1689 1690 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if 1691 - mapping of all pages not successful 1692 (i.e., either completely successful or fails) 1693 */ 1694 static int 1695 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, 1696 unsigned long uaddr, size_t count, int rw) 1697 { 1698 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 1699 unsigned long start = uaddr >> PAGE_SHIFT; 1700 const int nr_pages = end - start; 1701 int res, i, j; 1702 struct page **pages; 1703 1704 /* User attempted Overflow! */ 1705 if ((uaddr + count) < uaddr) 1706 return -EINVAL; 1707 1708 /* Too big */ 1709 if (nr_pages > max_pages) 1710 return -ENOMEM; 1711 1712 /* Hmm? */ 1713 if (count == 0) 1714 return 0; 1715 1716 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) 1717 return -ENOMEM; 1718 1719 /* Try to fault in all of the necessary pages */ 1720 down_read(¤t->mm->mmap_sem); 1721 /* rw==READ means read from drive, write into memory area */ 1722 res = get_user_pages( 1723 current, 1724 current->mm, 1725 uaddr, 1726 nr_pages, 1727 rw == READ, 1728 0, /* don't force */ 1729 pages, 1730 NULL); 1731 up_read(¤t->mm->mmap_sem); 1732 1733 /* Errors and no page mapped should return here */ 1734 if (res < nr_pages) 1735 goto out_unmap; 1736 1737 for (i=0; i < nr_pages; i++) { 1738 /* FIXME: flush superflous for rw==READ, 1739 * probably wrong function for rw==WRITE 1740 */ 1741 flush_dcache_page(pages[i]); 1742 /* ?? Is locking needed? I don't think so */ 1743 /* if (TestSetPageLocked(pages[i])) 1744 goto out_unlock; */ 1745 } 1746 1747 sgl[0].page = pages[0]; 1748 sgl[0].offset = uaddr & ~PAGE_MASK; 1749 if (nr_pages > 1) { 1750 sgl[0].length = PAGE_SIZE - sgl[0].offset; 1751 count -= sgl[0].length; 1752 for (i=1; i < nr_pages ; i++) { 1753 sgl[i].page = pages[i]; 1754 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; 1755 count -= PAGE_SIZE; 1756 } 1757 } 1758 else { 1759 sgl[0].length = count; 1760 } 1761 1762 kfree(pages); 1763 return nr_pages; 1764 1765 out_unmap: 1766 if (res > 0) { 1767 for (j=0; j < res; j++) 1768 page_cache_release(pages[j]); 1769 res = 0; 1770 } 1771 kfree(pages); 1772 return res; 1773 } 1774 1775 1776 /* And unmap them... */ 1777 static int 1778 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, 1779 int dirtied) 1780 { 1781 int i; 1782 1783 for (i=0; i < nr_pages; i++) { 1784 struct page *page = sgl[i].page; 1785 1786 if (dirtied) 1787 SetPageDirty(page); 1788 /* unlock_page(page); */ 1789 /* FIXME: cache flush missing for rw==READ 1790 * FIXME: call the correct reference counting function 1791 */ 1792 page_cache_release(page); 1793 } 1794 1795 return 0; 1796 } 1797 1798 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ 1799 #endif 1800 1801 1802 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ 1803 static int 1804 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) 1805 { 1806 #ifdef SG_ALLOW_DIO_CODE 1807 sg_io_hdr_t *hp = &srp->header; 1808 Sg_scatter_hold *schp = &srp->data; 1809 int sg_tablesize = sfp->parentdp->sg_tablesize; 1810 int mx_sc_elems, res; 1811 struct scsi_device *sdev = sfp->parentdp->device; 1812 1813 if (((unsigned long)hp->dxferp & 1814 queue_dma_alignment(sdev->request_queue)) != 0) 1815 return 1; 1816 1817 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1818 if (mx_sc_elems <= 0) { 1819 return 1; 1820 } 1821 res = st_map_user_pages(schp->buffer, mx_sc_elems, 1822 (unsigned long)hp->dxferp, dxfer_len, 1823 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0); 1824 if (res <= 0) { 1825 sg_remove_scat(schp); 1826 return 1; 1827 } 1828 schp->k_use_sg = res; 1829 schp->dio_in_use = 1; 1830 hp->info |= SG_INFO_DIRECT_IO; 1831 return 0; 1832 #else 1833 return 1; 1834 #endif 1835 } 1836 1837 static int 1838 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1839 { 1840 struct scatterlist *sg; 1841 int ret_sz = 0, k, rem_sz, num, mx_sc_elems; 1842 int sg_tablesize = sfp->parentdp->sg_tablesize; 1843 int blk_size = buff_size; 1844 struct page *p = NULL; 1845 1846 if ((blk_size < 0) || (!sfp)) 1847 return -EFAULT; 1848 if (0 == blk_size) 1849 ++blk_size; /* don't know why */ 1850 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1851 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); 1852 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1853 buff_size, blk_size)); 1854 1855 /* N.B. ret_sz carried into this block ... */ 1856 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1857 if (mx_sc_elems < 0) 1858 return mx_sc_elems; /* most likely -ENOMEM */ 1859 1860 num = scatter_elem_sz; 1861 if (unlikely(num != scatter_elem_sz_prev)) { 1862 if (num < PAGE_SIZE) { 1863 scatter_elem_sz = PAGE_SIZE; 1864 scatter_elem_sz_prev = PAGE_SIZE; 1865 } else 1866 scatter_elem_sz_prev = num; 1867 } 1868 for (k = 0, sg = schp->buffer, rem_sz = blk_size; 1869 (rem_sz > 0) && (k < mx_sc_elems); 1870 ++k, rem_sz -= ret_sz, ++sg) { 1871 1872 num = (rem_sz > scatter_elem_sz_prev) ? 1873 scatter_elem_sz_prev : rem_sz; 1874 p = sg_page_malloc(num, sfp->low_dma, &ret_sz); 1875 if (!p) 1876 return -ENOMEM; 1877 1878 if (num == scatter_elem_sz_prev) { 1879 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1880 scatter_elem_sz = ret_sz; 1881 scatter_elem_sz_prev = ret_sz; 1882 } 1883 } 1884 sg->page = p; 1885 sg->length = (ret_sz > num) ? num : ret_sz; 1886 1887 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " 1888 "ret_sz=%d\n", k, num, ret_sz)); 1889 } /* end of for loop */ 1890 1891 schp->k_use_sg = k; 1892 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " 1893 "rem_sz=%d\n", k, rem_sz)); 1894 1895 schp->bufflen = blk_size; 1896 if (rem_sz > 0) /* must have failed */ 1897 return -ENOMEM; 1898 1899 return 0; 1900 } 1901 1902 static int 1903 sg_write_xfer(Sg_request * srp) 1904 { 1905 sg_io_hdr_t *hp = &srp->header; 1906 Sg_scatter_hold *schp = &srp->data; 1907 struct scatterlist *sg = schp->buffer; 1908 int num_xfer = 0; 1909 int j, k, onum, usglen, ksglen, res; 1910 int iovec_count = (int) hp->iovec_count; 1911 int dxfer_dir = hp->dxfer_direction; 1912 unsigned char *p; 1913 unsigned char __user *up; 1914 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 1915 1916 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || 1917 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 1918 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); 1919 if (schp->bufflen < num_xfer) 1920 num_xfer = schp->bufflen; 1921 } 1922 if ((num_xfer <= 0) || (schp->dio_in_use) || 1923 (new_interface 1924 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 1925 return 0; 1926 1927 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 1928 num_xfer, iovec_count, schp->k_use_sg)); 1929 if (iovec_count) { 1930 onum = iovec_count; 1931 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 1932 return -EFAULT; 1933 } else 1934 onum = 1; 1935 1936 ksglen = sg->length; 1937 p = page_address(sg->page); 1938 for (j = 0, k = 0; j < onum; ++j) { 1939 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); 1940 if (res) 1941 return res; 1942 1943 for (; p; ++sg, ksglen = sg->length, 1944 p = page_address(sg->page)) { 1945 if (usglen <= 0) 1946 break; 1947 if (ksglen > usglen) { 1948 if (usglen >= num_xfer) { 1949 if (__copy_from_user(p, up, num_xfer)) 1950 return -EFAULT; 1951 return 0; 1952 } 1953 if (__copy_from_user(p, up, usglen)) 1954 return -EFAULT; 1955 p += usglen; 1956 ksglen -= usglen; 1957 break; 1958 } else { 1959 if (ksglen >= num_xfer) { 1960 if (__copy_from_user(p, up, num_xfer)) 1961 return -EFAULT; 1962 return 0; 1963 } 1964 if (__copy_from_user(p, up, ksglen)) 1965 return -EFAULT; 1966 up += ksglen; 1967 usglen -= ksglen; 1968 } 1969 ++k; 1970 if (k >= schp->k_use_sg) 1971 return 0; 1972 } 1973 } 1974 1975 return 0; 1976 } 1977 1978 static int 1979 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 1980 int wr_xf, int *countp, unsigned char __user **up) 1981 { 1982 int num_xfer = (int) hp->dxfer_len; 1983 unsigned char __user *p = hp->dxferp; 1984 int count; 1985 1986 if (0 == sg_num) { 1987 if (wr_xf && ('\0' == hp->interface_id)) 1988 count = (int) hp->flags; /* holds "old" input_size */ 1989 else 1990 count = num_xfer; 1991 } else { 1992 sg_iovec_t iovec; 1993 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) 1994 return -EFAULT; 1995 p = iovec.iov_base; 1996 count = (int) iovec.iov_len; 1997 } 1998 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) 1999 return -EFAULT; 2000 if (up) 2001 *up = p; 2002 if (countp) 2003 *countp = count; 2004 return 0; 2005 } 2006 2007 static void 2008 sg_remove_scat(Sg_scatter_hold * schp) 2009 { 2010 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 2011 if (schp->buffer && (schp->sglist_len > 0)) { 2012 struct scatterlist *sg = schp->buffer; 2013 2014 if (schp->dio_in_use) { 2015 #ifdef SG_ALLOW_DIO_CODE 2016 st_unmap_user_pages(sg, schp->k_use_sg, TRUE); 2017 #endif 2018 } else { 2019 int k; 2020 2021 for (k = 0; (k < schp->k_use_sg) && sg->page; 2022 ++k, ++sg) { 2023 SCSI_LOG_TIMEOUT(5, printk( 2024 "sg_remove_scat: k=%d, pg=0x%p, len=%d\n", 2025 k, sg->page, sg->length)); 2026 sg_page_free(sg->page, sg->length); 2027 } 2028 } 2029 kfree(schp->buffer); 2030 } 2031 memset(schp, 0, sizeof (*schp)); 2032 } 2033 2034 static int 2035 sg_read_xfer(Sg_request * srp) 2036 { 2037 sg_io_hdr_t *hp = &srp->header; 2038 Sg_scatter_hold *schp = &srp->data; 2039 struct scatterlist *sg = schp->buffer; 2040 int num_xfer = 0; 2041 int j, k, onum, usglen, ksglen, res; 2042 int iovec_count = (int) hp->iovec_count; 2043 int dxfer_dir = hp->dxfer_direction; 2044 unsigned char *p; 2045 unsigned char __user *up; 2046 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 2047 2048 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) 2049 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 2050 num_xfer = hp->dxfer_len; 2051 if (schp->bufflen < num_xfer) 2052 num_xfer = schp->bufflen; 2053 } 2054 if ((num_xfer <= 0) || (schp->dio_in_use) || 2055 (new_interface 2056 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 2057 return 0; 2058 2059 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 2060 num_xfer, iovec_count, schp->k_use_sg)); 2061 if (iovec_count) { 2062 onum = iovec_count; 2063 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 2064 return -EFAULT; 2065 } else 2066 onum = 1; 2067 2068 p = page_address(sg->page); 2069 ksglen = sg->length; 2070 for (j = 0, k = 0; j < onum; ++j) { 2071 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); 2072 if (res) 2073 return res; 2074 2075 for (; p; ++sg, ksglen = sg->length, 2076 p = page_address(sg->page)) { 2077 if (usglen <= 0) 2078 break; 2079 if (ksglen > usglen) { 2080 if (usglen >= num_xfer) { 2081 if (__copy_to_user(up, p, num_xfer)) 2082 return -EFAULT; 2083 return 0; 2084 } 2085 if (__copy_to_user(up, p, usglen)) 2086 return -EFAULT; 2087 p += usglen; 2088 ksglen -= usglen; 2089 break; 2090 } else { 2091 if (ksglen >= num_xfer) { 2092 if (__copy_to_user(up, p, num_xfer)) 2093 return -EFAULT; 2094 return 0; 2095 } 2096 if (__copy_to_user(up, p, ksglen)) 2097 return -EFAULT; 2098 up += ksglen; 2099 usglen -= ksglen; 2100 } 2101 ++k; 2102 if (k >= schp->k_use_sg) 2103 return 0; 2104 } 2105 } 2106 2107 return 0; 2108 } 2109 2110 static int 2111 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 2112 { 2113 Sg_scatter_hold *schp = &srp->data; 2114 struct scatterlist *sg = schp->buffer; 2115 int k, num; 2116 2117 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 2118 num_read_xfer)); 2119 if ((!outp) || (num_read_xfer <= 0)) 2120 return 0; 2121 2122 for (k = 0; (k < schp->k_use_sg) && sg->page; ++k, ++sg) { 2123 num = sg->length; 2124 if (num > num_read_xfer) { 2125 if (__copy_to_user(outp, page_address(sg->page), 2126 num_read_xfer)) 2127 return -EFAULT; 2128 break; 2129 } else { 2130 if (__copy_to_user(outp, page_address(sg->page), 2131 num)) 2132 return -EFAULT; 2133 num_read_xfer -= num; 2134 if (num_read_xfer <= 0) 2135 break; 2136 outp += num; 2137 } 2138 } 2139 2140 return 0; 2141 } 2142 2143 static void 2144 sg_build_reserve(Sg_fd * sfp, int req_size) 2145 { 2146 Sg_scatter_hold *schp = &sfp->reserve; 2147 2148 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 2149 do { 2150 if (req_size < PAGE_SIZE) 2151 req_size = PAGE_SIZE; 2152 if (0 == sg_build_indirect(schp, sfp, req_size)) 2153 return; 2154 else 2155 sg_remove_scat(schp); 2156 req_size >>= 1; /* divide by 2 */ 2157 } while (req_size > (PAGE_SIZE / 2)); 2158 } 2159 2160 static void 2161 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 2162 { 2163 Sg_scatter_hold *req_schp = &srp->data; 2164 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2165 struct scatterlist *sg = rsv_schp->buffer; 2166 int k, num, rem; 2167 2168 srp->res_used = 1; 2169 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 2170 rem = size; 2171 2172 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sg) { 2173 num = sg->length; 2174 if (rem <= num) { 2175 sfp->save_scat_len = num; 2176 sg->length = rem; 2177 req_schp->k_use_sg = k + 1; 2178 req_schp->sglist_len = rsv_schp->sglist_len; 2179 req_schp->buffer = rsv_schp->buffer; 2180 2181 req_schp->bufflen = size; 2182 req_schp->b_malloc_len = rsv_schp->b_malloc_len; 2183 break; 2184 } else 2185 rem -= num; 2186 } 2187 2188 if (k >= rsv_schp->k_use_sg) 2189 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 2190 } 2191 2192 static void 2193 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 2194 { 2195 Sg_scatter_hold *req_schp = &srp->data; 2196 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2197 2198 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 2199 (int) req_schp->k_use_sg)); 2200 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { 2201 struct scatterlist *sg = rsv_schp->buffer; 2202 2203 if (sfp->save_scat_len > 0) 2204 (sg + (req_schp->k_use_sg - 1))->length = 2205 (unsigned) sfp->save_scat_len; 2206 else 2207 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); 2208 } 2209 req_schp->k_use_sg = 0; 2210 req_schp->bufflen = 0; 2211 req_schp->buffer = NULL; 2212 req_schp->sglist_len = 0; 2213 sfp->save_scat_len = 0; 2214 srp->res_used = 0; 2215 } 2216 2217 static Sg_request * 2218 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 2219 { 2220 Sg_request *resp; 2221 unsigned long iflags; 2222 2223 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2224 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 2225 /* look for requests that are ready + not SG_IO owned */ 2226 if ((1 == resp->done) && (!resp->sg_io_owned) && 2227 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 2228 resp->done = 2; /* guard against other readers */ 2229 break; 2230 } 2231 } 2232 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2233 return resp; 2234 } 2235 2236 #ifdef CONFIG_SCSI_PROC_FS 2237 static Sg_request * 2238 sg_get_nth_request(Sg_fd * sfp, int nth) 2239 { 2240 Sg_request *resp; 2241 unsigned long iflags; 2242 int k; 2243 2244 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2245 for (k = 0, resp = sfp->headrp; resp && (k < nth); 2246 ++k, resp = resp->nextrp) ; 2247 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2248 return resp; 2249 } 2250 #endif 2251 2252 /* always adds to end of list */ 2253 static Sg_request * 2254 sg_add_request(Sg_fd * sfp) 2255 { 2256 int k; 2257 unsigned long iflags; 2258 Sg_request *resp; 2259 Sg_request *rp = sfp->req_arr; 2260 2261 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2262 resp = sfp->headrp; 2263 if (!resp) { 2264 memset(rp, 0, sizeof (Sg_request)); 2265 rp->parentfp = sfp; 2266 resp = rp; 2267 sfp->headrp = resp; 2268 } else { 2269 if (0 == sfp->cmd_q) 2270 resp = NULL; /* command queuing disallowed */ 2271 else { 2272 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2273 if (!rp->parentfp) 2274 break; 2275 } 2276 if (k < SG_MAX_QUEUE) { 2277 memset(rp, 0, sizeof (Sg_request)); 2278 rp->parentfp = sfp; 2279 while (resp->nextrp) 2280 resp = resp->nextrp; 2281 resp->nextrp = rp; 2282 resp = rp; 2283 } else 2284 resp = NULL; 2285 } 2286 } 2287 if (resp) { 2288 resp->nextrp = NULL; 2289 resp->header.duration = jiffies_to_msecs(jiffies); 2290 } 2291 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2292 return resp; 2293 } 2294 2295 /* Return of 1 for found; 0 for not found */ 2296 static int 2297 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2298 { 2299 Sg_request *prev_rp; 2300 Sg_request *rp; 2301 unsigned long iflags; 2302 int res = 0; 2303 2304 if ((!sfp) || (!srp) || (!sfp->headrp)) 2305 return res; 2306 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2307 prev_rp = sfp->headrp; 2308 if (srp == prev_rp) { 2309 sfp->headrp = prev_rp->nextrp; 2310 prev_rp->parentfp = NULL; 2311 res = 1; 2312 } else { 2313 while ((rp = prev_rp->nextrp)) { 2314 if (srp == rp) { 2315 prev_rp->nextrp = rp->nextrp; 2316 rp->parentfp = NULL; 2317 res = 1; 2318 break; 2319 } 2320 prev_rp = rp; 2321 } 2322 } 2323 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2324 return res; 2325 } 2326 2327 #ifdef CONFIG_SCSI_PROC_FS 2328 static Sg_fd * 2329 sg_get_nth_sfp(Sg_device * sdp, int nth) 2330 { 2331 Sg_fd *resp; 2332 unsigned long iflags; 2333 int k; 2334 2335 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2336 for (k = 0, resp = sdp->headfp; resp && (k < nth); 2337 ++k, resp = resp->nextfp) ; 2338 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2339 return resp; 2340 } 2341 #endif 2342 2343 static Sg_fd * 2344 sg_add_sfp(Sg_device * sdp, int dev) 2345 { 2346 Sg_fd *sfp; 2347 unsigned long iflags; 2348 int bufflen; 2349 2350 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2351 if (!sfp) 2352 return NULL; 2353 2354 init_waitqueue_head(&sfp->read_wait); 2355 rwlock_init(&sfp->rq_list_lock); 2356 2357 sfp->timeout = SG_DEFAULT_TIMEOUT; 2358 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2359 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2360 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2361 sdp->device->host->unchecked_isa_dma : 1; 2362 sfp->cmd_q = SG_DEF_COMMAND_Q; 2363 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2364 sfp->parentdp = sdp; 2365 write_lock_irqsave(&sg_dev_arr_lock, iflags); 2366 if (!sdp->headfp) 2367 sdp->headfp = sfp; 2368 else { /* add to tail of existing list */ 2369 Sg_fd *pfp = sdp->headfp; 2370 while (pfp->nextfp) 2371 pfp = pfp->nextfp; 2372 pfp->nextfp = sfp; 2373 } 2374 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2375 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2376 if (unlikely(sg_big_buff != def_reserved_size)) 2377 sg_big_buff = def_reserved_size; 2378 2379 bufflen = min_t(int, sg_big_buff, 2380 sdp->device->request_queue->max_sectors * 512); 2381 sg_build_reserve(sfp, bufflen); 2382 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2383 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2384 return sfp; 2385 } 2386 2387 static void 2388 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2389 { 2390 Sg_fd *fp; 2391 Sg_fd *prev_fp; 2392 2393 prev_fp = sdp->headfp; 2394 if (sfp == prev_fp) 2395 sdp->headfp = prev_fp->nextfp; 2396 else { 2397 while ((fp = prev_fp->nextfp)) { 2398 if (sfp == fp) { 2399 prev_fp->nextfp = fp->nextfp; 2400 break; 2401 } 2402 prev_fp = fp; 2403 } 2404 } 2405 if (sfp->reserve.bufflen > 0) { 2406 SCSI_LOG_TIMEOUT(6, 2407 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2408 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); 2409 sg_remove_scat(&sfp->reserve); 2410 } 2411 sfp->parentdp = NULL; 2412 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); 2413 kfree(sfp); 2414 } 2415 2416 /* Returns 0 in normal case, 1 when detached and sdp object removed */ 2417 static int 2418 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2419 { 2420 Sg_request *srp; 2421 Sg_request *tsrp; 2422 int dirty = 0; 2423 int res = 0; 2424 2425 for (srp = sfp->headrp; srp; srp = tsrp) { 2426 tsrp = srp->nextrp; 2427 if (sg_srp_done(srp, sfp)) 2428 sg_finish_rem_req(srp); 2429 else 2430 ++dirty; 2431 } 2432 if (0 == dirty) { 2433 unsigned long iflags; 2434 2435 write_lock_irqsave(&sg_dev_arr_lock, iflags); 2436 __sg_remove_sfp(sdp, sfp); 2437 if (sdp->detached && (NULL == sdp->headfp)) { 2438 int k, maxd; 2439 2440 maxd = sg_dev_max; 2441 for (k = 0; k < maxd; ++k) { 2442 if (sdp == sg_dev_arr[k]) 2443 break; 2444 } 2445 if (k < maxd) 2446 sg_dev_arr[k] = NULL; 2447 kfree((char *) sdp); 2448 res = 1; 2449 } 2450 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2451 } else { 2452 /* MOD_INC's to inhibit unloading sg and associated adapter driver */ 2453 /* only bump the access_count if we actually succeeded in 2454 * throwing another counter on the host module */ 2455 scsi_device_get(sdp->device); /* XXX: retval ignored? */ 2456 sfp->closed = 1; /* flag dirty state on this fd */ 2457 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", 2458 dirty)); 2459 } 2460 return res; 2461 } 2462 2463 static int 2464 sg_res_in_use(Sg_fd * sfp) 2465 { 2466 const Sg_request *srp; 2467 unsigned long iflags; 2468 2469 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2470 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2471 if (srp->res_used) 2472 break; 2473 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2474 return srp ? 1 : 0; 2475 } 2476 2477 /* The size fetched (value output via retSzp) set when non-NULL return */ 2478 static struct page * 2479 sg_page_malloc(int rqSz, int lowDma, int *retSzp) 2480 { 2481 struct page *resp = NULL; 2482 gfp_t page_mask; 2483 int order, a_size; 2484 int resSz; 2485 2486 if ((rqSz <= 0) || (NULL == retSzp)) 2487 return resp; 2488 2489 if (lowDma) 2490 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN; 2491 else 2492 page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 2493 2494 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; 2495 order++, a_size <<= 1) ; 2496 resSz = a_size; /* rounded up if necessary */ 2497 resp = alloc_pages(page_mask, order); 2498 while ((!resp) && order) { 2499 --order; 2500 a_size >>= 1; /* divide by 2, until PAGE_SIZE */ 2501 resp = alloc_pages(page_mask, order); /* try half */ 2502 resSz = a_size; 2503 } 2504 if (resp) { 2505 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2506 memset(page_address(resp), 0, resSz); 2507 *retSzp = resSz; 2508 } 2509 return resp; 2510 } 2511 2512 static void 2513 sg_page_free(struct page *page, int size) 2514 { 2515 int order, a_size; 2516 2517 if (!page) 2518 return; 2519 for (order = 0, a_size = PAGE_SIZE; a_size < size; 2520 order++, a_size <<= 1) ; 2521 __free_pages(page, order); 2522 } 2523 2524 #ifndef MAINTENANCE_IN_CMD 2525 #define MAINTENANCE_IN_CMD 0xa3 2526 #endif 2527 2528 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, 2529 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, 2530 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, 2531 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD 2532 }; 2533 2534 static int 2535 sg_allow_access(unsigned char opcode, char dev_type) 2536 { 2537 int k; 2538 2539 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */ 2540 return 1; 2541 for (k = 0; k < sizeof (allow_ops); ++k) { 2542 if (opcode == allow_ops[k]) 2543 return 1; 2544 } 2545 return 0; 2546 } 2547 2548 #ifdef CONFIG_SCSI_PROC_FS 2549 static int 2550 sg_last_dev(void) 2551 { 2552 int k; 2553 unsigned long iflags; 2554 2555 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2556 for (k = sg_dev_max - 1; k >= 0; --k) 2557 if (sg_dev_arr[k] && sg_dev_arr[k]->device) 2558 break; 2559 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2560 return k + 1; /* origin 1 */ 2561 } 2562 #endif 2563 2564 static Sg_device * 2565 sg_get_dev(int dev) 2566 { 2567 Sg_device *sdp = NULL; 2568 unsigned long iflags; 2569 2570 if (sg_dev_arr && (dev >= 0)) { 2571 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2572 if (dev < sg_dev_max) 2573 sdp = sg_dev_arr[dev]; 2574 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2575 } 2576 return sdp; 2577 } 2578 2579 #ifdef CONFIG_SCSI_PROC_FS 2580 2581 static struct proc_dir_entry *sg_proc_sgp = NULL; 2582 2583 static char sg_proc_sg_dirname[] = "scsi/sg"; 2584 2585 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2586 2587 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2588 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2589 size_t count, loff_t *off); 2590 static struct file_operations adio_fops = { 2591 /* .owner, .read and .llseek added in sg_proc_init() */ 2592 .open = sg_proc_single_open_adio, 2593 .write = sg_proc_write_adio, 2594 .release = single_release, 2595 }; 2596 2597 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2598 static ssize_t sg_proc_write_dressz(struct file *filp, 2599 const char __user *buffer, size_t count, loff_t *off); 2600 static struct file_operations dressz_fops = { 2601 .open = sg_proc_single_open_dressz, 2602 .write = sg_proc_write_dressz, 2603 .release = single_release, 2604 }; 2605 2606 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2607 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2608 static struct file_operations version_fops = { 2609 .open = sg_proc_single_open_version, 2610 .release = single_release, 2611 }; 2612 2613 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2614 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2615 static struct file_operations devhdr_fops = { 2616 .open = sg_proc_single_open_devhdr, 2617 .release = single_release, 2618 }; 2619 2620 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2621 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2622 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2623 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2624 static void dev_seq_stop(struct seq_file *s, void *v); 2625 static struct file_operations dev_fops = { 2626 .open = sg_proc_open_dev, 2627 .release = seq_release, 2628 }; 2629 static struct seq_operations dev_seq_ops = { 2630 .start = dev_seq_start, 2631 .next = dev_seq_next, 2632 .stop = dev_seq_stop, 2633 .show = sg_proc_seq_show_dev, 2634 }; 2635 2636 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2637 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2638 static struct file_operations devstrs_fops = { 2639 .open = sg_proc_open_devstrs, 2640 .release = seq_release, 2641 }; 2642 static struct seq_operations devstrs_seq_ops = { 2643 .start = dev_seq_start, 2644 .next = dev_seq_next, 2645 .stop = dev_seq_stop, 2646 .show = sg_proc_seq_show_devstrs, 2647 }; 2648 2649 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2650 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2651 static struct file_operations debug_fops = { 2652 .open = sg_proc_open_debug, 2653 .release = seq_release, 2654 }; 2655 static struct seq_operations debug_seq_ops = { 2656 .start = dev_seq_start, 2657 .next = dev_seq_next, 2658 .stop = dev_seq_stop, 2659 .show = sg_proc_seq_show_debug, 2660 }; 2661 2662 2663 struct sg_proc_leaf { 2664 const char * name; 2665 struct file_operations * fops; 2666 }; 2667 2668 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2669 {"allow_dio", &adio_fops}, 2670 {"debug", &debug_fops}, 2671 {"def_reserved_size", &dressz_fops}, 2672 {"device_hdr", &devhdr_fops}, 2673 {"devices", &dev_fops}, 2674 {"device_strs", &devstrs_fops}, 2675 {"version", &version_fops} 2676 }; 2677 2678 static int 2679 sg_proc_init(void) 2680 { 2681 int k, mask; 2682 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2683 struct proc_dir_entry *pdep; 2684 struct sg_proc_leaf * leaf; 2685 2686 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2687 if (!sg_proc_sgp) 2688 return 1; 2689 for (k = 0; k < num_leaves; ++k) { 2690 leaf = &sg_proc_leaf_arr[k]; 2691 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2692 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp); 2693 if (pdep) { 2694 leaf->fops->owner = THIS_MODULE, 2695 leaf->fops->read = seq_read, 2696 leaf->fops->llseek = seq_lseek, 2697 pdep->proc_fops = leaf->fops; 2698 } 2699 } 2700 return 0; 2701 } 2702 2703 static void 2704 sg_proc_cleanup(void) 2705 { 2706 int k; 2707 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2708 2709 if (!sg_proc_sgp) 2710 return; 2711 for (k = 0; k < num_leaves; ++k) 2712 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2713 remove_proc_entry(sg_proc_sg_dirname, NULL); 2714 } 2715 2716 2717 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2718 { 2719 seq_printf(s, "%d\n", *((int *)s->private)); 2720 return 0; 2721 } 2722 2723 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2724 { 2725 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2726 } 2727 2728 static ssize_t 2729 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2730 size_t count, loff_t *off) 2731 { 2732 int num; 2733 char buff[11]; 2734 2735 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2736 return -EACCES; 2737 num = (count < 10) ? count : 10; 2738 if (copy_from_user(buff, buffer, num)) 2739 return -EFAULT; 2740 buff[num] = '\0'; 2741 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2742 return count; 2743 } 2744 2745 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2746 { 2747 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2748 } 2749 2750 static ssize_t 2751 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2752 size_t count, loff_t *off) 2753 { 2754 int num; 2755 unsigned long k = ULONG_MAX; 2756 char buff[11]; 2757 2758 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2759 return -EACCES; 2760 num = (count < 10) ? count : 10; 2761 if (copy_from_user(buff, buffer, num)) 2762 return -EFAULT; 2763 buff[num] = '\0'; 2764 k = simple_strtoul(buff, NULL, 10); 2765 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2766 sg_big_buff = k; 2767 return count; 2768 } 2769 return -ERANGE; 2770 } 2771 2772 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2773 { 2774 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2775 sg_version_date); 2776 return 0; 2777 } 2778 2779 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2780 { 2781 return single_open(file, sg_proc_seq_show_version, NULL); 2782 } 2783 2784 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2785 { 2786 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2787 "online\n"); 2788 return 0; 2789 } 2790 2791 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2792 { 2793 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2794 } 2795 2796 struct sg_proc_deviter { 2797 loff_t index; 2798 size_t max; 2799 }; 2800 2801 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2802 { 2803 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2804 2805 s->private = it; 2806 if (! it) 2807 return NULL; 2808 2809 if (NULL == sg_dev_arr) 2810 return NULL; 2811 it->index = *pos; 2812 it->max = sg_last_dev(); 2813 if (it->index >= it->max) 2814 return NULL; 2815 return it; 2816 } 2817 2818 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2819 { 2820 struct sg_proc_deviter * it = s->private; 2821 2822 *pos = ++it->index; 2823 return (it->index < it->max) ? it : NULL; 2824 } 2825 2826 static void dev_seq_stop(struct seq_file *s, void *v) 2827 { 2828 kfree(s->private); 2829 } 2830 2831 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2832 { 2833 return seq_open(file, &dev_seq_ops); 2834 } 2835 2836 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2837 { 2838 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2839 Sg_device *sdp; 2840 struct scsi_device *scsidp; 2841 2842 sdp = it ? sg_get_dev(it->index) : NULL; 2843 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2844 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2845 scsidp->host->host_no, scsidp->channel, 2846 scsidp->id, scsidp->lun, (int) scsidp->type, 2847 1, 2848 (int) scsidp->queue_depth, 2849 (int) scsidp->device_busy, 2850 (int) scsi_device_online(scsidp)); 2851 else 2852 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2853 return 0; 2854 } 2855 2856 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2857 { 2858 return seq_open(file, &devstrs_seq_ops); 2859 } 2860 2861 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2862 { 2863 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2864 Sg_device *sdp; 2865 struct scsi_device *scsidp; 2866 2867 sdp = it ? sg_get_dev(it->index) : NULL; 2868 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2869 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2870 scsidp->vendor, scsidp->model, scsidp->rev); 2871 else 2872 seq_printf(s, "<no active device>\n"); 2873 return 0; 2874 } 2875 2876 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2877 { 2878 int k, m, new_interface, blen, usg; 2879 Sg_request *srp; 2880 Sg_fd *fp; 2881 const sg_io_hdr_t *hp; 2882 const char * cp; 2883 unsigned int ms; 2884 2885 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { 2886 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2887 "(res)sgat=%d low_dma=%d\n", k + 1, 2888 jiffies_to_msecs(fp->timeout), 2889 fp->reserve.bufflen, 2890 (int) fp->reserve.k_use_sg, 2891 (int) fp->low_dma); 2892 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2893 (int) fp->cmd_q, (int) fp->force_packid, 2894 (int) fp->keep_orphan, (int) fp->closed); 2895 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { 2896 hp = &srp->header; 2897 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2898 if (srp->res_used) { 2899 if (new_interface && 2900 (SG_FLAG_MMAP_IO & hp->flags)) 2901 cp = " mmap>> "; 2902 else 2903 cp = " rb>> "; 2904 } else { 2905 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2906 cp = " dio>> "; 2907 else 2908 cp = " "; 2909 } 2910 seq_printf(s, cp); 2911 blen = srp->data.bufflen; 2912 usg = srp->data.k_use_sg; 2913 seq_printf(s, srp->done ? 2914 ((1 == srp->done) ? "rcv:" : "fin:") 2915 : "act:"); 2916 seq_printf(s, " id=%d blen=%d", 2917 srp->header.pack_id, blen); 2918 if (srp->done) 2919 seq_printf(s, " dur=%d", hp->duration); 2920 else { 2921 ms = jiffies_to_msecs(jiffies); 2922 seq_printf(s, " t_o/elap=%d/%d", 2923 (new_interface ? hp->timeout : 2924 jiffies_to_msecs(fp->timeout)), 2925 (ms > hp->duration ? ms - hp->duration : 0)); 2926 } 2927 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2928 (int) srp->data.cmd_opcode); 2929 } 2930 if (0 == m) 2931 seq_printf(s, " No requests active\n"); 2932 } 2933 } 2934 2935 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2936 { 2937 return seq_open(file, &debug_seq_ops); 2938 } 2939 2940 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2941 { 2942 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2943 Sg_device *sdp; 2944 2945 if (it && (0 == it->index)) { 2946 seq_printf(s, "dev_max(currently)=%d max_active_device=%d " 2947 "(origin 1)\n", sg_dev_max, (int)it->max); 2948 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2949 } 2950 sdp = it ? sg_get_dev(it->index) : NULL; 2951 if (sdp) { 2952 struct scsi_device *scsidp = sdp->device; 2953 2954 if (NULL == scsidp) { 2955 seq_printf(s, "device %d detached ??\n", 2956 (int)it->index); 2957 return 0; 2958 } 2959 2960 if (sg_get_nth_sfp(sdp, 0)) { 2961 seq_printf(s, " >>> device=%s ", 2962 sdp->disk->disk_name); 2963 if (sdp->detached) 2964 seq_printf(s, "detached pending close "); 2965 else 2966 seq_printf 2967 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2968 scsidp->host->host_no, 2969 scsidp->channel, scsidp->id, 2970 scsidp->lun, 2971 scsidp->host->hostt->emulated); 2972 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2973 sdp->sg_tablesize, sdp->exclude); 2974 } 2975 sg_proc_debug_helper(s, sdp); 2976 } 2977 return 0; 2978 } 2979 2980 #endif /* CONFIG_SCSI_PROC_FS */ 2981 2982 module_init(init_sg); 2983 module_exit(exit_sg); 2984