1 /* 2 * History: 3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), 4 * to allow user process control of SCSI devices. 5 * Development Sponsored by Killy Corp. NY NY 6 * 7 * Original driver (sg.c): 8 * Copyright (C) 1992 Lawrence Foard 9 * Version 2 and 3 extensions to driver: 10 * Copyright (C) 1998 - 2005 Douglas Gilbert 11 * 12 * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 */ 20 21 static int sg_version_num = 30534; /* 2 digits for each component */ 22 #define SG_VERSION_STR "3.5.34" 23 24 /* 25 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes: 26 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First 27 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING 28 * (otherwise the macros compile to empty statements). 29 * 30 */ 31 #include <linux/module.h> 32 33 #include <linux/fs.h> 34 #include <linux/kernel.h> 35 #include <linux/sched.h> 36 #include <linux/string.h> 37 #include <linux/mm.h> 38 #include <linux/errno.h> 39 #include <linux/mtio.h> 40 #include <linux/ioctl.h> 41 #include <linux/fcntl.h> 42 #include <linux/init.h> 43 #include <linux/poll.h> 44 #include <linux/moduleparam.h> 45 #include <linux/cdev.h> 46 #include <linux/idr.h> 47 #include <linux/seq_file.h> 48 #include <linux/blkdev.h> 49 #include <linux/delay.h> 50 #include <linux/scatterlist.h> 51 #include <linux/blktrace_api.h> 52 53 #include "scsi.h" 54 #include <scsi/scsi_dbg.h> 55 #include <scsi/scsi_host.h> 56 #include <scsi/scsi_driver.h> 57 #include <scsi/scsi_ioctl.h> 58 #include <scsi/sg.h> 59 60 #include "scsi_logging.h" 61 62 #ifdef CONFIG_SCSI_PROC_FS 63 #include <linux/proc_fs.h> 64 static char *sg_version_date = "20061027"; 65 66 static int sg_proc_init(void); 67 static void sg_proc_cleanup(void); 68 #endif 69 70 #define SG_ALLOW_DIO_DEF 0 71 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */ 72 73 #define SG_MAX_DEVS 32768 74 75 /* 76 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 77 * Then when using 32 bit integers x * m may overflow during the calculation. 78 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 79 * calculates the same, but prevents the overflow when both m and d 80 * are "small" numbers (like HZ and USER_HZ). 81 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 82 * in 32 bits. 83 */ 84 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 85 86 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 87 88 int sg_big_buff = SG_DEF_RESERVED_SIZE; 89 /* N.B. This variable is readable and writeable via 90 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 91 of this size (or less if there is not enough memory) will be reserved 92 for use by this file descriptor. [Deprecated usage: this variable is also 93 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 94 the kernel (i.e. it is not a module).] */ 95 static int def_reserved_size = -1; /* picks up init parameter */ 96 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 97 98 static int scatter_elem_sz = SG_SCATTER_SZ; 99 static int scatter_elem_sz_prev = SG_SCATTER_SZ; 100 101 #define SG_SECTOR_SZ 512 102 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) 103 104 static int sg_add(struct device *, struct class_interface *); 105 static void sg_remove(struct device *, struct class_interface *); 106 107 static DEFINE_IDR(sg_index_idr); 108 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock 109 file descriptor list for device */ 110 111 static struct class_interface sg_interface = { 112 .add_dev = sg_add, 113 .remove_dev = 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 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 u32 index; /* device index number */ 167 Sg_fd *headfp; /* first open fd belonging to this device */ 168 volatile char detached; /* 0->attached, 1->detached pending removal */ 169 volatile char exclude; /* opened for exclusive access */ 170 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 171 struct gendisk *disk; 172 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 173 } Sg_device; 174 175 static int sg_fasync(int fd, struct file *filp, int mode); 176 /* tasklet or soft irq callback */ 177 static void sg_cmd_done(void *data, char *sense, int result, int resid); 178 static int sg_start_req(Sg_request * srp); 179 static void sg_finish_rem_req(Sg_request * srp); 180 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 181 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, 182 int tablesize); 183 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 184 Sg_request * srp); 185 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 186 int blocking, int read_only, Sg_request ** o_srp); 187 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 188 unsigned char *cmnd, int timeout, int blocking); 189 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 190 int wr_xf, int *countp, unsigned char __user **up); 191 static int sg_write_xfer(Sg_request * srp); 192 static int sg_read_xfer(Sg_request * srp); 193 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 194 static void sg_remove_scat(Sg_scatter_hold * schp); 195 static void sg_build_reserve(Sg_fd * sfp, int req_size); 196 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 197 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 198 static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp); 199 static void sg_page_free(struct page *page, int size); 200 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 201 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 202 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 203 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 204 static Sg_request *sg_add_request(Sg_fd * sfp); 205 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 206 static int sg_res_in_use(Sg_fd * sfp); 207 static int sg_allow_access(unsigned char opcode, char dev_type); 208 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); 209 static Sg_device *sg_get_dev(int dev); 210 #ifdef CONFIG_SCSI_PROC_FS 211 static int sg_last_dev(void); 212 #endif 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 static char cmd[TASK_COMM_LEN]; 608 if (strcmp(current->comm, cmd) && printk_ratelimit()) { 609 printk(KERN_WARNING 610 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" 611 "guessing data in;\n" KERN_WARNING " " 612 "program %s not setting count and/or reply_len properly\n", 613 old_hdr.reply_len - (int)SZ_SG_HEADER, 614 input_size, (unsigned int) cmnd[0], 615 current->comm); 616 strcpy(cmd, current->comm); 617 } 618 } 619 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 620 return (k < 0) ? k : count; 621 } 622 623 static ssize_t 624 sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 625 int blocking, int read_only, Sg_request ** o_srp) 626 { 627 int k; 628 Sg_request *srp; 629 sg_io_hdr_t *hp; 630 unsigned char cmnd[MAX_COMMAND_SIZE]; 631 int timeout; 632 unsigned long ul_timeout; 633 634 if (count < SZ_SG_IO_HDR) 635 return -EINVAL; 636 if (!access_ok(VERIFY_READ, buf, count)) 637 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 638 639 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 640 if (!(srp = sg_add_request(sfp))) { 641 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 642 return -EDOM; 643 } 644 hp = &srp->header; 645 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 646 sg_remove_request(sfp, srp); 647 return -EFAULT; 648 } 649 if (hp->interface_id != 'S') { 650 sg_remove_request(sfp, srp); 651 return -ENOSYS; 652 } 653 if (hp->flags & SG_FLAG_MMAP_IO) { 654 if (hp->dxfer_len > sfp->reserve.bufflen) { 655 sg_remove_request(sfp, srp); 656 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 657 } 658 if (hp->flags & SG_FLAG_DIRECT_IO) { 659 sg_remove_request(sfp, srp); 660 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 661 } 662 if (sg_res_in_use(sfp)) { 663 sg_remove_request(sfp, srp); 664 return -EBUSY; /* reserve buffer already being used */ 665 } 666 } 667 ul_timeout = msecs_to_jiffies(srp->header.timeout); 668 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 669 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 670 sg_remove_request(sfp, srp); 671 return -EMSGSIZE; 672 } 673 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 674 sg_remove_request(sfp, srp); 675 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 676 } 677 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 678 sg_remove_request(sfp, srp); 679 return -EFAULT; 680 } 681 if (read_only && 682 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) { 683 sg_remove_request(sfp, srp); 684 return -EPERM; 685 } 686 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 687 if (k < 0) 688 return k; 689 if (o_srp) 690 *o_srp = srp; 691 return count; 692 } 693 694 static int 695 sg_common_write(Sg_fd * sfp, Sg_request * srp, 696 unsigned char *cmnd, int timeout, int blocking) 697 { 698 int k, data_dir; 699 Sg_device *sdp = sfp->parentdp; 700 sg_io_hdr_t *hp = &srp->header; 701 702 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 703 hp->status = 0; 704 hp->masked_status = 0; 705 hp->msg_status = 0; 706 hp->info = 0; 707 hp->host_status = 0; 708 hp->driver_status = 0; 709 hp->resid = 0; 710 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 711 (int) cmnd[0], (int) hp->cmd_len)); 712 713 if ((k = sg_start_req(srp))) { 714 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); 715 sg_finish_rem_req(srp); 716 return k; /* probably out of space --> ENOMEM */ 717 } 718 if ((k = sg_write_xfer(srp))) { 719 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n")); 720 sg_finish_rem_req(srp); 721 return k; 722 } 723 if (sdp->detached) { 724 sg_finish_rem_req(srp); 725 return -ENODEV; 726 } 727 728 switch (hp->dxfer_direction) { 729 case SG_DXFER_TO_FROM_DEV: 730 case SG_DXFER_FROM_DEV: 731 data_dir = DMA_FROM_DEVICE; 732 break; 733 case SG_DXFER_TO_DEV: 734 data_dir = DMA_TO_DEVICE; 735 break; 736 case SG_DXFER_UNKNOWN: 737 data_dir = DMA_BIDIRECTIONAL; 738 break; 739 default: 740 data_dir = DMA_NONE; 741 break; 742 } 743 hp->duration = jiffies_to_msecs(jiffies); 744 /* Now send everything of to mid-level. The next time we hear about this 745 packet is when sg_cmd_done() is called (i.e. a callback). */ 746 if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer, 747 hp->dxfer_len, srp->data.k_use_sg, timeout, 748 SG_DEFAULT_RETRIES, srp, sg_cmd_done, 749 GFP_ATOMIC)) { 750 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n")); 751 /* 752 * most likely out of mem, but could also be a bad map 753 */ 754 sg_finish_rem_req(srp); 755 return -ENOMEM; 756 } else 757 return 0; 758 } 759 760 static int 761 sg_srp_done(Sg_request *srp, Sg_fd *sfp) 762 { 763 unsigned long iflags; 764 int done; 765 766 read_lock_irqsave(&sfp->rq_list_lock, iflags); 767 done = srp->done; 768 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 769 return done; 770 } 771 772 static int 773 sg_ioctl(struct inode *inode, struct file *filp, 774 unsigned int cmd_in, unsigned long arg) 775 { 776 void __user *p = (void __user *)arg; 777 int __user *ip = p; 778 int result, val, read_only; 779 Sg_device *sdp; 780 Sg_fd *sfp; 781 Sg_request *srp; 782 unsigned long iflags; 783 784 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 785 return -ENXIO; 786 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 787 sdp->disk->disk_name, (int) cmd_in)); 788 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 789 790 switch (cmd_in) { 791 case SG_IO: 792 { 793 int blocking = 1; /* ignore O_NONBLOCK flag */ 794 795 if (sdp->detached) 796 return -ENODEV; 797 if (!scsi_block_when_processing_errors(sdp->device)) 798 return -ENXIO; 799 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 800 return -EFAULT; 801 result = 802 sg_new_write(sfp, p, SZ_SG_IO_HDR, 803 blocking, read_only, &srp); 804 if (result < 0) 805 return result; 806 srp->sg_io_owned = 1; 807 while (1) { 808 result = 0; /* following macro to beat race condition */ 809 __wait_event_interruptible(sfp->read_wait, 810 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), 811 result); 812 if (sdp->detached) 813 return -ENODEV; 814 if (sfp->closed) 815 return 0; /* request packet dropped already */ 816 if (0 == result) 817 break; 818 srp->orphan = 1; 819 return result; /* -ERESTARTSYS because signal hit process */ 820 } 821 write_lock_irqsave(&sfp->rq_list_lock, iflags); 822 srp->done = 2; 823 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 824 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 825 return (result < 0) ? result : 0; 826 } 827 case SG_SET_TIMEOUT: 828 result = get_user(val, ip); 829 if (result) 830 return result; 831 if (val < 0) 832 return -EIO; 833 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 834 val = MULDIV (INT_MAX, USER_HZ, HZ); 835 sfp->timeout_user = val; 836 sfp->timeout = MULDIV (val, HZ, USER_HZ); 837 838 return 0; 839 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 840 /* strange ..., for backward compatibility */ 841 return sfp->timeout_user; 842 case SG_SET_FORCE_LOW_DMA: 843 result = get_user(val, ip); 844 if (result) 845 return result; 846 if (val) { 847 sfp->low_dma = 1; 848 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 849 val = (int) sfp->reserve.bufflen; 850 sg_remove_scat(&sfp->reserve); 851 sg_build_reserve(sfp, val); 852 } 853 } else { 854 if (sdp->detached) 855 return -ENODEV; 856 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 857 } 858 return 0; 859 case SG_GET_LOW_DMA: 860 return put_user((int) sfp->low_dma, ip); 861 case SG_GET_SCSI_ID: 862 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 863 return -EFAULT; 864 else { 865 sg_scsi_id_t __user *sg_idp = p; 866 867 if (sdp->detached) 868 return -ENODEV; 869 __put_user((int) sdp->device->host->host_no, 870 &sg_idp->host_no); 871 __put_user((int) sdp->device->channel, 872 &sg_idp->channel); 873 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 874 __put_user((int) sdp->device->lun, &sg_idp->lun); 875 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 876 __put_user((short) sdp->device->host->cmd_per_lun, 877 &sg_idp->h_cmd_per_lun); 878 __put_user((short) sdp->device->queue_depth, 879 &sg_idp->d_queue_depth); 880 __put_user(0, &sg_idp->unused[0]); 881 __put_user(0, &sg_idp->unused[1]); 882 return 0; 883 } 884 case SG_SET_FORCE_PACK_ID: 885 result = get_user(val, ip); 886 if (result) 887 return result; 888 sfp->force_packid = val ? 1 : 0; 889 return 0; 890 case SG_GET_PACK_ID: 891 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 892 return -EFAULT; 893 read_lock_irqsave(&sfp->rq_list_lock, iflags); 894 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 895 if ((1 == srp->done) && (!srp->sg_io_owned)) { 896 read_unlock_irqrestore(&sfp->rq_list_lock, 897 iflags); 898 __put_user(srp->header.pack_id, ip); 899 return 0; 900 } 901 } 902 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 903 __put_user(-1, ip); 904 return 0; 905 case SG_GET_NUM_WAITING: 906 read_lock_irqsave(&sfp->rq_list_lock, iflags); 907 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 908 if ((1 == srp->done) && (!srp->sg_io_owned)) 909 ++val; 910 } 911 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 912 return put_user(val, ip); 913 case SG_GET_SG_TABLESIZE: 914 return put_user(sdp->sg_tablesize, ip); 915 case SG_SET_RESERVED_SIZE: 916 result = get_user(val, ip); 917 if (result) 918 return result; 919 if (val < 0) 920 return -EINVAL; 921 val = min_t(int, val, 922 sdp->device->request_queue->max_sectors * 512); 923 if (val != sfp->reserve.bufflen) { 924 if (sg_res_in_use(sfp) || sfp->mmap_called) 925 return -EBUSY; 926 sg_remove_scat(&sfp->reserve); 927 sg_build_reserve(sfp, val); 928 } 929 return 0; 930 case SG_GET_RESERVED_SIZE: 931 val = min_t(int, sfp->reserve.bufflen, 932 sdp->device->request_queue->max_sectors * 512); 933 return put_user(val, ip); 934 case SG_SET_COMMAND_Q: 935 result = get_user(val, ip); 936 if (result) 937 return result; 938 sfp->cmd_q = val ? 1 : 0; 939 return 0; 940 case SG_GET_COMMAND_Q: 941 return put_user((int) sfp->cmd_q, ip); 942 case SG_SET_KEEP_ORPHAN: 943 result = get_user(val, ip); 944 if (result) 945 return result; 946 sfp->keep_orphan = val; 947 return 0; 948 case SG_GET_KEEP_ORPHAN: 949 return put_user((int) sfp->keep_orphan, ip); 950 case SG_NEXT_CMD_LEN: 951 result = get_user(val, ip); 952 if (result) 953 return result; 954 sfp->next_cmd_len = (val > 0) ? val : 0; 955 return 0; 956 case SG_GET_VERSION_NUM: 957 return put_user(sg_version_num, ip); 958 case SG_GET_ACCESS_COUNT: 959 /* faked - we don't have a real access count anymore */ 960 val = (sdp->device ? 1 : 0); 961 return put_user(val, ip); 962 case SG_GET_REQUEST_TABLE: 963 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 964 return -EFAULT; 965 else { 966 sg_req_info_t *rinfo; 967 unsigned int ms; 968 969 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 970 GFP_KERNEL); 971 if (!rinfo) 972 return -ENOMEM; 973 read_lock_irqsave(&sfp->rq_list_lock, iflags); 974 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 975 ++val, srp = srp ? srp->nextrp : srp) { 976 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 977 if (srp) { 978 rinfo[val].req_state = srp->done + 1; 979 rinfo[val].problem = 980 srp->header.masked_status & 981 srp->header.host_status & 982 srp->header.driver_status; 983 if (srp->done) 984 rinfo[val].duration = 985 srp->header.duration; 986 else { 987 ms = jiffies_to_msecs(jiffies); 988 rinfo[val].duration = 989 (ms > srp->header.duration) ? 990 (ms - srp->header.duration) : 0; 991 } 992 rinfo[val].orphan = srp->orphan; 993 rinfo[val].sg_io_owned = 994 srp->sg_io_owned; 995 rinfo[val].pack_id = 996 srp->header.pack_id; 997 rinfo[val].usr_ptr = 998 srp->header.usr_ptr; 999 } 1000 } 1001 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1002 result = __copy_to_user(p, rinfo, 1003 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 1004 result = result ? -EFAULT : 0; 1005 kfree(rinfo); 1006 return result; 1007 } 1008 case SG_EMULATED_HOST: 1009 if (sdp->detached) 1010 return -ENODEV; 1011 return put_user(sdp->device->host->hostt->emulated, ip); 1012 case SG_SCSI_RESET: 1013 if (sdp->detached) 1014 return -ENODEV; 1015 if (filp->f_flags & O_NONBLOCK) { 1016 if (scsi_host_in_recovery(sdp->device->host)) 1017 return -EBUSY; 1018 } else if (!scsi_block_when_processing_errors(sdp->device)) 1019 return -EBUSY; 1020 result = get_user(val, ip); 1021 if (result) 1022 return result; 1023 if (SG_SCSI_RESET_NOTHING == val) 1024 return 0; 1025 switch (val) { 1026 case SG_SCSI_RESET_DEVICE: 1027 val = SCSI_TRY_RESET_DEVICE; 1028 break; 1029 case SG_SCSI_RESET_BUS: 1030 val = SCSI_TRY_RESET_BUS; 1031 break; 1032 case SG_SCSI_RESET_HOST: 1033 val = SCSI_TRY_RESET_HOST; 1034 break; 1035 default: 1036 return -EINVAL; 1037 } 1038 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1039 return -EACCES; 1040 return (scsi_reset_provider(sdp->device, val) == 1041 SUCCESS) ? 0 : -EIO; 1042 case SCSI_IOCTL_SEND_COMMAND: 1043 if (sdp->detached) 1044 return -ENODEV; 1045 if (read_only) { 1046 unsigned char opcode = WRITE_6; 1047 Scsi_Ioctl_Command __user *siocp = p; 1048 1049 if (copy_from_user(&opcode, siocp->data, 1)) 1050 return -EFAULT; 1051 if (!sg_allow_access(opcode, sdp->device->type)) 1052 return -EPERM; 1053 } 1054 return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p); 1055 case SG_SET_DEBUG: 1056 result = get_user(val, ip); 1057 if (result) 1058 return result; 1059 sdp->sgdebug = (char) val; 1060 return 0; 1061 case SCSI_IOCTL_GET_IDLUN: 1062 case SCSI_IOCTL_GET_BUS_NUMBER: 1063 case SCSI_IOCTL_PROBE_HOST: 1064 case SG_GET_TRANSFORM: 1065 if (sdp->detached) 1066 return -ENODEV; 1067 return scsi_ioctl(sdp->device, cmd_in, p); 1068 case BLKSECTGET: 1069 return put_user(sdp->device->request_queue->max_sectors * 512, 1070 ip); 1071 case BLKTRACESETUP: 1072 return blk_trace_setup(sdp->device->request_queue, 1073 sdp->disk->disk_name, 1074 sdp->device->sdev_gendev.devt, 1075 (char *)arg); 1076 case BLKTRACESTART: 1077 return blk_trace_startstop(sdp->device->request_queue, 1); 1078 case BLKTRACESTOP: 1079 return blk_trace_startstop(sdp->device->request_queue, 0); 1080 case BLKTRACETEARDOWN: 1081 return blk_trace_remove(sdp->device->request_queue); 1082 default: 1083 if (read_only) 1084 return -EPERM; /* don't know so take safe approach */ 1085 return scsi_ioctl(sdp->device, cmd_in, p); 1086 } 1087 } 1088 1089 #ifdef CONFIG_COMPAT 1090 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1091 { 1092 Sg_device *sdp; 1093 Sg_fd *sfp; 1094 struct scsi_device *sdev; 1095 1096 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1097 return -ENXIO; 1098 1099 sdev = sdp->device; 1100 if (sdev->host->hostt->compat_ioctl) { 1101 int ret; 1102 1103 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1104 1105 return ret; 1106 } 1107 1108 return -ENOIOCTLCMD; 1109 } 1110 #endif 1111 1112 static unsigned int 1113 sg_poll(struct file *filp, poll_table * wait) 1114 { 1115 unsigned int res = 0; 1116 Sg_device *sdp; 1117 Sg_fd *sfp; 1118 Sg_request *srp; 1119 int count = 0; 1120 unsigned long iflags; 1121 1122 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) 1123 || sfp->closed) 1124 return POLLERR; 1125 poll_wait(filp, &sfp->read_wait, wait); 1126 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1127 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1128 /* if any read waiting, flag it */ 1129 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1130 res = POLLIN | POLLRDNORM; 1131 ++count; 1132 } 1133 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1134 1135 if (sdp->detached) 1136 res |= POLLHUP; 1137 else if (!sfp->cmd_q) { 1138 if (0 == count) 1139 res |= POLLOUT | POLLWRNORM; 1140 } else if (count < SG_MAX_QUEUE) 1141 res |= POLLOUT | POLLWRNORM; 1142 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1143 sdp->disk->disk_name, (int) res)); 1144 return res; 1145 } 1146 1147 static int 1148 sg_fasync(int fd, struct file *filp, int mode) 1149 { 1150 int retval; 1151 Sg_device *sdp; 1152 Sg_fd *sfp; 1153 1154 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1155 return -ENXIO; 1156 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1157 sdp->disk->disk_name, mode)); 1158 1159 retval = fasync_helper(fd, filp, mode, &sfp->async_qp); 1160 return (retval < 0) ? retval : 0; 1161 } 1162 1163 static int 1164 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1165 { 1166 Sg_fd *sfp; 1167 unsigned long offset, len, sa; 1168 Sg_scatter_hold *rsv_schp; 1169 struct scatterlist *sg; 1170 int k; 1171 1172 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1173 return VM_FAULT_SIGBUS; 1174 rsv_schp = &sfp->reserve; 1175 offset = vmf->pgoff << PAGE_SHIFT; 1176 if (offset >= rsv_schp->bufflen) 1177 return VM_FAULT_SIGBUS; 1178 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", 1179 offset, rsv_schp->k_use_sg)); 1180 sg = rsv_schp->buffer; 1181 sa = vma->vm_start; 1182 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1183 ++k, sg = sg_next(sg)) { 1184 len = vma->vm_end - sa; 1185 len = (len < sg->length) ? len : sg->length; 1186 if (offset < len) { 1187 struct page *page; 1188 page = virt_to_page(page_address(sg_page(sg)) + offset); 1189 get_page(page); /* increment page count */ 1190 vmf->page = page; 1191 return 0; /* success */ 1192 } 1193 sa += len; 1194 offset -= len; 1195 } 1196 1197 return VM_FAULT_SIGBUS; 1198 } 1199 1200 static struct vm_operations_struct sg_mmap_vm_ops = { 1201 .fault = sg_vma_fault, 1202 }; 1203 1204 static int 1205 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1206 { 1207 Sg_fd *sfp; 1208 unsigned long req_sz, len, sa; 1209 Sg_scatter_hold *rsv_schp; 1210 int k; 1211 struct scatterlist *sg; 1212 1213 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1214 return -ENXIO; 1215 req_sz = vma->vm_end - vma->vm_start; 1216 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1217 (void *) vma->vm_start, (int) req_sz)); 1218 if (vma->vm_pgoff) 1219 return -EINVAL; /* want no offset */ 1220 rsv_schp = &sfp->reserve; 1221 if (req_sz > rsv_schp->bufflen) 1222 return -ENOMEM; /* cannot map more than reserved buffer */ 1223 1224 sa = vma->vm_start; 1225 sg = rsv_schp->buffer; 1226 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1227 ++k, sg = sg_next(sg)) { 1228 len = vma->vm_end - sa; 1229 len = (len < sg->length) ? len : sg->length; 1230 sa += len; 1231 } 1232 1233 sfp->mmap_called = 1; 1234 vma->vm_flags |= VM_RESERVED; 1235 vma->vm_private_data = sfp; 1236 vma->vm_ops = &sg_mmap_vm_ops; 1237 return 0; 1238 } 1239 1240 /* This function is a "bottom half" handler that is called by the 1241 * mid level when a command is completed (or has failed). */ 1242 static void 1243 sg_cmd_done(void *data, char *sense, int result, int resid) 1244 { 1245 Sg_request *srp = data; 1246 Sg_device *sdp = NULL; 1247 Sg_fd *sfp; 1248 unsigned long iflags; 1249 unsigned int ms; 1250 1251 if (NULL == srp) { 1252 printk(KERN_ERR "sg_cmd_done: NULL request\n"); 1253 return; 1254 } 1255 sfp = srp->parentfp; 1256 if (sfp) 1257 sdp = sfp->parentdp; 1258 if ((NULL == sdp) || sdp->detached) { 1259 printk(KERN_INFO "sg_cmd_done: device detached\n"); 1260 return; 1261 } 1262 1263 1264 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1265 sdp->disk->disk_name, srp->header.pack_id, result)); 1266 srp->header.resid = resid; 1267 ms = jiffies_to_msecs(jiffies); 1268 srp->header.duration = (ms > srp->header.duration) ? 1269 (ms - srp->header.duration) : 0; 1270 if (0 != result) { 1271 struct scsi_sense_hdr sshdr; 1272 1273 memcpy(srp->sense_b, sense, sizeof (srp->sense_b)); 1274 srp->header.status = 0xff & result; 1275 srp->header.masked_status = status_byte(result); 1276 srp->header.msg_status = msg_byte(result); 1277 srp->header.host_status = host_byte(result); 1278 srp->header.driver_status = driver_byte(result); 1279 if ((sdp->sgdebug > 0) && 1280 ((CHECK_CONDITION == srp->header.masked_status) || 1281 (COMMAND_TERMINATED == srp->header.masked_status))) 1282 __scsi_print_sense("sg_cmd_done", sense, 1283 SCSI_SENSE_BUFFERSIZE); 1284 1285 /* Following if statement is a patch supplied by Eric Youngdale */ 1286 if (driver_byte(result) != 0 1287 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1288 && !scsi_sense_is_deferred(&sshdr) 1289 && sshdr.sense_key == UNIT_ATTENTION 1290 && sdp->device->removable) { 1291 /* Detected possible disc change. Set the bit - this */ 1292 /* may be used if there are filesystems using this device */ 1293 sdp->device->changed = 1; 1294 } 1295 } 1296 /* Rely on write phase to clean out srp status values, so no "else" */ 1297 1298 if (sfp->closed) { /* whoops this fd already released, cleanup */ 1299 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); 1300 sg_finish_rem_req(srp); 1301 srp = NULL; 1302 if (NULL == sfp->headrp) { 1303 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n")); 1304 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ 1305 scsi_device_put(sdp->device); 1306 } 1307 sfp = NULL; 1308 } 1309 } else if (srp && srp->orphan) { 1310 if (sfp->keep_orphan) 1311 srp->sg_io_owned = 0; 1312 else { 1313 sg_finish_rem_req(srp); 1314 srp = NULL; 1315 } 1316 } 1317 if (sfp && srp) { 1318 /* Now wake up any sg_read() that is waiting for this packet. */ 1319 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1320 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1321 srp->done = 1; 1322 wake_up_interruptible(&sfp->read_wait); 1323 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1324 } 1325 } 1326 1327 static struct file_operations sg_fops = { 1328 .owner = THIS_MODULE, 1329 .read = sg_read, 1330 .write = sg_write, 1331 .poll = sg_poll, 1332 .ioctl = sg_ioctl, 1333 #ifdef CONFIG_COMPAT 1334 .compat_ioctl = sg_compat_ioctl, 1335 #endif 1336 .open = sg_open, 1337 .mmap = sg_mmap, 1338 .release = sg_release, 1339 .fasync = sg_fasync, 1340 }; 1341 1342 static struct class *sg_sysfs_class; 1343 1344 static int sg_sysfs_valid = 0; 1345 1346 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1347 { 1348 struct request_queue *q = scsidp->request_queue; 1349 Sg_device *sdp; 1350 unsigned long iflags; 1351 int error; 1352 u32 k; 1353 1354 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1355 if (!sdp) { 1356 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1357 return ERR_PTR(-ENOMEM); 1358 } 1359 error = -ENOMEM; 1360 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) { 1361 printk(KERN_WARNING "idr expansion Sg_device failure\n"); 1362 goto out; 1363 } 1364 1365 write_lock_irqsave(&sg_index_lock, iflags); 1366 error = idr_get_new(&sg_index_idr, sdp, &k); 1367 write_unlock_irqrestore(&sg_index_lock, iflags); 1368 1369 if (error) { 1370 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n", 1371 error); 1372 goto out; 1373 } 1374 1375 if (unlikely(k >= SG_MAX_DEVS)) 1376 goto overflow; 1377 1378 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1379 sprintf(disk->disk_name, "sg%d", k); 1380 disk->first_minor = k; 1381 sdp->disk = disk; 1382 sdp->device = scsidp; 1383 init_waitqueue_head(&sdp->o_excl_wait); 1384 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments); 1385 sdp->index = k; 1386 1387 error = 0; 1388 out: 1389 if (error) { 1390 kfree(sdp); 1391 return ERR_PTR(error); 1392 } 1393 return sdp; 1394 1395 overflow: 1396 sdev_printk(KERN_WARNING, scsidp, 1397 "Unable to attach sg device type=%d, minor " 1398 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); 1399 error = -ENODEV; 1400 goto out; 1401 } 1402 1403 static int 1404 sg_add(struct device *cl_dev, struct class_interface *cl_intf) 1405 { 1406 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1407 struct gendisk *disk; 1408 Sg_device *sdp = NULL; 1409 struct cdev * cdev = NULL; 1410 int error; 1411 unsigned long iflags; 1412 1413 disk = alloc_disk(1); 1414 if (!disk) { 1415 printk(KERN_WARNING "alloc_disk failed\n"); 1416 return -ENOMEM; 1417 } 1418 disk->major = SCSI_GENERIC_MAJOR; 1419 1420 error = -ENOMEM; 1421 cdev = cdev_alloc(); 1422 if (!cdev) { 1423 printk(KERN_WARNING "cdev_alloc failed\n"); 1424 goto out; 1425 } 1426 cdev->owner = THIS_MODULE; 1427 cdev->ops = &sg_fops; 1428 1429 sdp = sg_alloc(disk, scsidp); 1430 if (IS_ERR(sdp)) { 1431 printk(KERN_WARNING "sg_alloc failed\n"); 1432 error = PTR_ERR(sdp); 1433 goto out; 1434 } 1435 1436 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); 1437 if (error) 1438 goto cdev_add_err; 1439 1440 sdp->cdev = cdev; 1441 if (sg_sysfs_valid) { 1442 struct device *sg_class_member; 1443 1444 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, 1445 MKDEV(SCSI_GENERIC_MAJOR, 1446 sdp->index), 1447 "%s", disk->disk_name); 1448 if (IS_ERR(sg_class_member)) { 1449 printk(KERN_ERR "sg_add: " 1450 "device_create failed\n"); 1451 error = PTR_ERR(sg_class_member); 1452 goto cdev_add_err; 1453 } 1454 dev_set_drvdata(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", sdp->index); 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", sdp->index, 1465 scsidp->type); 1466 1467 dev_set_drvdata(cl_dev, sdp); 1468 1469 return 0; 1470 1471 cdev_add_err: 1472 write_lock_irqsave(&sg_index_lock, iflags); 1473 idr_remove(&sg_index_idr, sdp->index); 1474 write_unlock_irqrestore(&sg_index_lock, iflags); 1475 kfree(sdp); 1476 1477 out: 1478 put_disk(disk); 1479 if (cdev) 1480 cdev_del(cdev); 1481 return error; 1482 } 1483 1484 static void 1485 sg_remove(struct device *cl_dev, struct class_interface *cl_intf) 1486 { 1487 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1488 Sg_device *sdp = dev_get_drvdata(cl_dev); 1489 unsigned long iflags; 1490 Sg_fd *sfp; 1491 Sg_fd *tsfp; 1492 Sg_request *srp; 1493 Sg_request *tsrp; 1494 int delay; 1495 1496 if (!sdp) 1497 return; 1498 1499 delay = 0; 1500 write_lock_irqsave(&sg_index_lock, iflags); 1501 if (sdp->headfp) { 1502 sdp->detached = 1; 1503 for (sfp = sdp->headfp; sfp; sfp = tsfp) { 1504 tsfp = sfp->nextfp; 1505 for (srp = sfp->headrp; srp; srp = tsrp) { 1506 tsrp = srp->nextrp; 1507 if (sfp->closed || (0 == sg_srp_done(srp, sfp))) 1508 sg_finish_rem_req(srp); 1509 } 1510 if (sfp->closed) { 1511 scsi_device_put(sdp->device); 1512 __sg_remove_sfp(sdp, sfp); 1513 } else { 1514 delay = 1; 1515 wake_up_interruptible(&sfp->read_wait); 1516 kill_fasync(&sfp->async_qp, SIGPOLL, 1517 POLL_HUP); 1518 } 1519 } 1520 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index)); 1521 if (NULL == sdp->headfp) { 1522 idr_remove(&sg_index_idr, sdp->index); 1523 } 1524 } else { /* nothing active, simple case */ 1525 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index)); 1526 idr_remove(&sg_index_idr, sdp->index); 1527 } 1528 write_unlock_irqrestore(&sg_index_lock, iflags); 1529 1530 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1531 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); 1532 cdev_del(sdp->cdev); 1533 sdp->cdev = NULL; 1534 put_disk(sdp->disk); 1535 sdp->disk = NULL; 1536 if (NULL == sdp->headfp) 1537 kfree(sdp); 1538 1539 if (delay) 1540 msleep(10); /* dirty detach so delay device destruction */ 1541 } 1542 1543 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1544 module_param_named(def_reserved_size, def_reserved_size, int, 1545 S_IRUGO | S_IWUSR); 1546 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1547 1548 MODULE_AUTHOR("Douglas Gilbert"); 1549 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1550 MODULE_LICENSE("GPL"); 1551 MODULE_VERSION(SG_VERSION_STR); 1552 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1553 1554 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1555 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1556 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1557 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1558 1559 static int __init 1560 init_sg(void) 1561 { 1562 int rc; 1563 1564 if (scatter_elem_sz < PAGE_SIZE) { 1565 scatter_elem_sz = PAGE_SIZE; 1566 scatter_elem_sz_prev = scatter_elem_sz; 1567 } 1568 if (def_reserved_size >= 0) 1569 sg_big_buff = def_reserved_size; 1570 else 1571 def_reserved_size = sg_big_buff; 1572 1573 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1574 SG_MAX_DEVS, "sg"); 1575 if (rc) 1576 return rc; 1577 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1578 if ( IS_ERR(sg_sysfs_class) ) { 1579 rc = PTR_ERR(sg_sysfs_class); 1580 goto err_out; 1581 } 1582 sg_sysfs_valid = 1; 1583 rc = scsi_register_interface(&sg_interface); 1584 if (0 == rc) { 1585 #ifdef CONFIG_SCSI_PROC_FS 1586 sg_proc_init(); 1587 #endif /* CONFIG_SCSI_PROC_FS */ 1588 return 0; 1589 } 1590 class_destroy(sg_sysfs_class); 1591 err_out: 1592 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1593 return rc; 1594 } 1595 1596 static void __exit 1597 exit_sg(void) 1598 { 1599 #ifdef CONFIG_SCSI_PROC_FS 1600 sg_proc_cleanup(); 1601 #endif /* CONFIG_SCSI_PROC_FS */ 1602 scsi_unregister_interface(&sg_interface); 1603 class_destroy(sg_sysfs_class); 1604 sg_sysfs_valid = 0; 1605 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1606 SG_MAX_DEVS); 1607 idr_destroy(&sg_index_idr); 1608 } 1609 1610 static int 1611 sg_start_req(Sg_request * srp) 1612 { 1613 int res; 1614 Sg_fd *sfp = srp->parentfp; 1615 sg_io_hdr_t *hp = &srp->header; 1616 int dxfer_len = (int) hp->dxfer_len; 1617 int dxfer_dir = hp->dxfer_direction; 1618 Sg_scatter_hold *req_schp = &srp->data; 1619 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1620 1621 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); 1622 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1623 return 0; 1624 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && 1625 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && 1626 (!sfp->parentdp->device->host->unchecked_isa_dma)) { 1627 res = sg_build_direct(srp, sfp, dxfer_len); 1628 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ 1629 return res; 1630 } 1631 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) 1632 sg_link_reserve(sfp, srp, dxfer_len); 1633 else { 1634 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1635 if (res) { 1636 sg_remove_scat(req_schp); 1637 return res; 1638 } 1639 } 1640 return 0; 1641 } 1642 1643 static void 1644 sg_finish_rem_req(Sg_request * srp) 1645 { 1646 Sg_fd *sfp = srp->parentfp; 1647 Sg_scatter_hold *req_schp = &srp->data; 1648 1649 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1650 if (srp->res_used) 1651 sg_unlink_reserve(sfp, srp); 1652 else 1653 sg_remove_scat(req_schp); 1654 sg_remove_request(sfp, srp); 1655 } 1656 1657 static int 1658 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1659 { 1660 int sg_bufflen = tablesize * sizeof(struct scatterlist); 1661 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1662 1663 /* 1664 * TODO: test without low_dma, we should not need it since 1665 * the block layer will bounce the buffer for us 1666 * 1667 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list. 1668 */ 1669 if (sfp->low_dma) 1670 gfp_flags |= GFP_DMA; 1671 schp->buffer = kzalloc(sg_bufflen, gfp_flags); 1672 if (!schp->buffer) 1673 return -ENOMEM; 1674 sg_init_table(schp->buffer, tablesize); 1675 schp->sglist_len = sg_bufflen; 1676 return tablesize; /* number of scat_gath elements allocated */ 1677 } 1678 1679 #ifdef SG_ALLOW_DIO_CODE 1680 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ 1681 /* TODO: hopefully we can use the generic block layer code */ 1682 1683 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if 1684 - mapping of all pages not successful 1685 (i.e., either completely successful or fails) 1686 */ 1687 static int 1688 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, 1689 unsigned long uaddr, size_t count, int rw) 1690 { 1691 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 1692 unsigned long start = uaddr >> PAGE_SHIFT; 1693 const int nr_pages = end - start; 1694 int res, i, j; 1695 struct page **pages; 1696 1697 /* User attempted Overflow! */ 1698 if ((uaddr + count) < uaddr) 1699 return -EINVAL; 1700 1701 /* Too big */ 1702 if (nr_pages > max_pages) 1703 return -ENOMEM; 1704 1705 /* Hmm? */ 1706 if (count == 0) 1707 return 0; 1708 1709 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) 1710 return -ENOMEM; 1711 1712 /* Try to fault in all of the necessary pages */ 1713 down_read(¤t->mm->mmap_sem); 1714 /* rw==READ means read from drive, write into memory area */ 1715 res = get_user_pages( 1716 current, 1717 current->mm, 1718 uaddr, 1719 nr_pages, 1720 rw == READ, 1721 0, /* don't force */ 1722 pages, 1723 NULL); 1724 up_read(¤t->mm->mmap_sem); 1725 1726 /* Errors and no page mapped should return here */ 1727 if (res < nr_pages) 1728 goto out_unmap; 1729 1730 for (i=0; i < nr_pages; i++) { 1731 /* FIXME: flush superflous for rw==READ, 1732 * probably wrong function for rw==WRITE 1733 */ 1734 flush_dcache_page(pages[i]); 1735 /* ?? Is locking needed? I don't think so */ 1736 /* if (TestSetPageLocked(pages[i])) 1737 goto out_unlock; */ 1738 } 1739 1740 sg_set_page(sgl, pages[0], 0, uaddr & ~PAGE_MASK); 1741 if (nr_pages > 1) { 1742 sgl[0].length = PAGE_SIZE - sgl[0].offset; 1743 count -= sgl[0].length; 1744 for (i=1; i < nr_pages ; i++) 1745 sg_set_page(&sgl[i], pages[i], count < PAGE_SIZE ? count : PAGE_SIZE, 0); 1746 } 1747 else { 1748 sgl[0].length = count; 1749 } 1750 1751 kfree(pages); 1752 return nr_pages; 1753 1754 out_unmap: 1755 if (res > 0) { 1756 for (j=0; j < res; j++) 1757 page_cache_release(pages[j]); 1758 res = 0; 1759 } 1760 kfree(pages); 1761 return res; 1762 } 1763 1764 1765 /* And unmap them... */ 1766 static int 1767 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, 1768 int dirtied) 1769 { 1770 int i; 1771 1772 for (i=0; i < nr_pages; i++) { 1773 struct page *page = sg_page(&sgl[i]); 1774 1775 if (dirtied) 1776 SetPageDirty(page); 1777 /* unlock_page(page); */ 1778 /* FIXME: cache flush missing for rw==READ 1779 * FIXME: call the correct reference counting function 1780 */ 1781 page_cache_release(page); 1782 } 1783 1784 return 0; 1785 } 1786 1787 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ 1788 #endif 1789 1790 1791 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ 1792 static int 1793 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) 1794 { 1795 #ifdef SG_ALLOW_DIO_CODE 1796 sg_io_hdr_t *hp = &srp->header; 1797 Sg_scatter_hold *schp = &srp->data; 1798 int sg_tablesize = sfp->parentdp->sg_tablesize; 1799 int mx_sc_elems, res; 1800 struct scsi_device *sdev = sfp->parentdp->device; 1801 1802 if (((unsigned long)hp->dxferp & 1803 queue_dma_alignment(sdev->request_queue)) != 0) 1804 return 1; 1805 1806 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1807 if (mx_sc_elems <= 0) { 1808 return 1; 1809 } 1810 res = st_map_user_pages(schp->buffer, mx_sc_elems, 1811 (unsigned long)hp->dxferp, dxfer_len, 1812 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0); 1813 if (res <= 0) { 1814 sg_remove_scat(schp); 1815 return 1; 1816 } 1817 schp->k_use_sg = res; 1818 schp->dio_in_use = 1; 1819 hp->info |= SG_INFO_DIRECT_IO; 1820 return 0; 1821 #else 1822 return 1; 1823 #endif 1824 } 1825 1826 static int 1827 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1828 { 1829 struct scatterlist *sg; 1830 int ret_sz = 0, k, rem_sz, num, mx_sc_elems; 1831 int sg_tablesize = sfp->parentdp->sg_tablesize; 1832 int blk_size = buff_size; 1833 struct page *p = NULL; 1834 1835 if (blk_size < 0) 1836 return -EFAULT; 1837 if (0 == blk_size) 1838 ++blk_size; /* don't know why */ 1839 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1840 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); 1841 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1842 buff_size, blk_size)); 1843 1844 /* N.B. ret_sz carried into this block ... */ 1845 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1846 if (mx_sc_elems < 0) 1847 return mx_sc_elems; /* most likely -ENOMEM */ 1848 1849 num = scatter_elem_sz; 1850 if (unlikely(num != scatter_elem_sz_prev)) { 1851 if (num < PAGE_SIZE) { 1852 scatter_elem_sz = PAGE_SIZE; 1853 scatter_elem_sz_prev = PAGE_SIZE; 1854 } else 1855 scatter_elem_sz_prev = num; 1856 } 1857 for (k = 0, sg = schp->buffer, rem_sz = blk_size; 1858 (rem_sz > 0) && (k < mx_sc_elems); 1859 ++k, rem_sz -= ret_sz, sg = sg_next(sg)) { 1860 1861 num = (rem_sz > scatter_elem_sz_prev) ? 1862 scatter_elem_sz_prev : rem_sz; 1863 p = sg_page_malloc(num, sfp->low_dma, &ret_sz); 1864 if (!p) 1865 return -ENOMEM; 1866 1867 if (num == scatter_elem_sz_prev) { 1868 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1869 scatter_elem_sz = ret_sz; 1870 scatter_elem_sz_prev = ret_sz; 1871 } 1872 } 1873 sg_set_page(sg, p, (ret_sz > num) ? num : ret_sz, 0); 1874 1875 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " 1876 "ret_sz=%d\n", k, num, ret_sz)); 1877 } /* end of for loop */ 1878 1879 schp->k_use_sg = k; 1880 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " 1881 "rem_sz=%d\n", k, rem_sz)); 1882 1883 schp->bufflen = blk_size; 1884 if (rem_sz > 0) /* must have failed */ 1885 return -ENOMEM; 1886 1887 return 0; 1888 } 1889 1890 static int 1891 sg_write_xfer(Sg_request * srp) 1892 { 1893 sg_io_hdr_t *hp = &srp->header; 1894 Sg_scatter_hold *schp = &srp->data; 1895 struct scatterlist *sg = schp->buffer; 1896 int num_xfer = 0; 1897 int j, k, onum, usglen, ksglen, res; 1898 int iovec_count = (int) hp->iovec_count; 1899 int dxfer_dir = hp->dxfer_direction; 1900 unsigned char *p; 1901 unsigned char __user *up; 1902 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 1903 1904 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || 1905 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 1906 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); 1907 if (schp->bufflen < num_xfer) 1908 num_xfer = schp->bufflen; 1909 } 1910 if ((num_xfer <= 0) || (schp->dio_in_use) || 1911 (new_interface 1912 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 1913 return 0; 1914 1915 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 1916 num_xfer, iovec_count, schp->k_use_sg)); 1917 if (iovec_count) { 1918 onum = iovec_count; 1919 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 1920 return -EFAULT; 1921 } else 1922 onum = 1; 1923 1924 ksglen = sg->length; 1925 p = page_address(sg_page(sg)); 1926 for (j = 0, k = 0; j < onum; ++j) { 1927 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); 1928 if (res) 1929 return res; 1930 1931 for (; p; sg = sg_next(sg), ksglen = sg->length, 1932 p = page_address(sg_page(sg))) { 1933 if (usglen <= 0) 1934 break; 1935 if (ksglen > usglen) { 1936 if (usglen >= num_xfer) { 1937 if (__copy_from_user(p, up, num_xfer)) 1938 return -EFAULT; 1939 return 0; 1940 } 1941 if (__copy_from_user(p, up, usglen)) 1942 return -EFAULT; 1943 p += usglen; 1944 ksglen -= usglen; 1945 break; 1946 } else { 1947 if (ksglen >= num_xfer) { 1948 if (__copy_from_user(p, up, num_xfer)) 1949 return -EFAULT; 1950 return 0; 1951 } 1952 if (__copy_from_user(p, up, ksglen)) 1953 return -EFAULT; 1954 up += ksglen; 1955 usglen -= ksglen; 1956 } 1957 ++k; 1958 if (k >= schp->k_use_sg) 1959 return 0; 1960 } 1961 } 1962 1963 return 0; 1964 } 1965 1966 static int 1967 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 1968 int wr_xf, int *countp, unsigned char __user **up) 1969 { 1970 int num_xfer = (int) hp->dxfer_len; 1971 unsigned char __user *p = hp->dxferp; 1972 int count; 1973 1974 if (0 == sg_num) { 1975 if (wr_xf && ('\0' == hp->interface_id)) 1976 count = (int) hp->flags; /* holds "old" input_size */ 1977 else 1978 count = num_xfer; 1979 } else { 1980 sg_iovec_t iovec; 1981 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) 1982 return -EFAULT; 1983 p = iovec.iov_base; 1984 count = (int) iovec.iov_len; 1985 } 1986 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) 1987 return -EFAULT; 1988 if (up) 1989 *up = p; 1990 if (countp) 1991 *countp = count; 1992 return 0; 1993 } 1994 1995 static void 1996 sg_remove_scat(Sg_scatter_hold * schp) 1997 { 1998 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1999 if (schp->buffer && (schp->sglist_len > 0)) { 2000 struct scatterlist *sg = schp->buffer; 2001 2002 if (schp->dio_in_use) { 2003 #ifdef SG_ALLOW_DIO_CODE 2004 st_unmap_user_pages(sg, schp->k_use_sg, TRUE); 2005 #endif 2006 } else { 2007 int k; 2008 2009 for (k = 0; (k < schp->k_use_sg) && sg_page(sg); 2010 ++k, sg = sg_next(sg)) { 2011 SCSI_LOG_TIMEOUT(5, printk( 2012 "sg_remove_scat: k=%d, pg=0x%p, len=%d\n", 2013 k, sg_page(sg), sg->length)); 2014 sg_page_free(sg_page(sg), sg->length); 2015 } 2016 } 2017 kfree(schp->buffer); 2018 } 2019 memset(schp, 0, sizeof (*schp)); 2020 } 2021 2022 static int 2023 sg_read_xfer(Sg_request * srp) 2024 { 2025 sg_io_hdr_t *hp = &srp->header; 2026 Sg_scatter_hold *schp = &srp->data; 2027 struct scatterlist *sg = schp->buffer; 2028 int num_xfer = 0; 2029 int j, k, onum, usglen, ksglen, res; 2030 int iovec_count = (int) hp->iovec_count; 2031 int dxfer_dir = hp->dxfer_direction; 2032 unsigned char *p; 2033 unsigned char __user *up; 2034 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 2035 2036 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) 2037 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 2038 num_xfer = hp->dxfer_len; 2039 if (schp->bufflen < num_xfer) 2040 num_xfer = schp->bufflen; 2041 } 2042 if ((num_xfer <= 0) || (schp->dio_in_use) || 2043 (new_interface 2044 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 2045 return 0; 2046 2047 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 2048 num_xfer, iovec_count, schp->k_use_sg)); 2049 if (iovec_count) { 2050 onum = iovec_count; 2051 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 2052 return -EFAULT; 2053 } else 2054 onum = 1; 2055 2056 p = page_address(sg_page(sg)); 2057 ksglen = sg->length; 2058 for (j = 0, k = 0; j < onum; ++j) { 2059 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); 2060 if (res) 2061 return res; 2062 2063 for (; p; sg = sg_next(sg), ksglen = sg->length, 2064 p = page_address(sg_page(sg))) { 2065 if (usglen <= 0) 2066 break; 2067 if (ksglen > usglen) { 2068 if (usglen >= num_xfer) { 2069 if (__copy_to_user(up, p, num_xfer)) 2070 return -EFAULT; 2071 return 0; 2072 } 2073 if (__copy_to_user(up, p, usglen)) 2074 return -EFAULT; 2075 p += usglen; 2076 ksglen -= usglen; 2077 break; 2078 } else { 2079 if (ksglen >= num_xfer) { 2080 if (__copy_to_user(up, p, num_xfer)) 2081 return -EFAULT; 2082 return 0; 2083 } 2084 if (__copy_to_user(up, p, ksglen)) 2085 return -EFAULT; 2086 up += ksglen; 2087 usglen -= ksglen; 2088 } 2089 ++k; 2090 if (k >= schp->k_use_sg) 2091 return 0; 2092 } 2093 } 2094 2095 return 0; 2096 } 2097 2098 static int 2099 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 2100 { 2101 Sg_scatter_hold *schp = &srp->data; 2102 struct scatterlist *sg = schp->buffer; 2103 int k, num; 2104 2105 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 2106 num_read_xfer)); 2107 if ((!outp) || (num_read_xfer <= 0)) 2108 return 0; 2109 2110 for (k = 0; (k < schp->k_use_sg) && sg_page(sg); ++k, sg = sg_next(sg)) { 2111 num = sg->length; 2112 if (num > num_read_xfer) { 2113 if (__copy_to_user(outp, page_address(sg_page(sg)), 2114 num_read_xfer)) 2115 return -EFAULT; 2116 break; 2117 } else { 2118 if (__copy_to_user(outp, page_address(sg_page(sg)), 2119 num)) 2120 return -EFAULT; 2121 num_read_xfer -= num; 2122 if (num_read_xfer <= 0) 2123 break; 2124 outp += num; 2125 } 2126 } 2127 2128 return 0; 2129 } 2130 2131 static void 2132 sg_build_reserve(Sg_fd * sfp, int req_size) 2133 { 2134 Sg_scatter_hold *schp = &sfp->reserve; 2135 2136 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 2137 do { 2138 if (req_size < PAGE_SIZE) 2139 req_size = PAGE_SIZE; 2140 if (0 == sg_build_indirect(schp, sfp, req_size)) 2141 return; 2142 else 2143 sg_remove_scat(schp); 2144 req_size >>= 1; /* divide by 2 */ 2145 } while (req_size > (PAGE_SIZE / 2)); 2146 } 2147 2148 static void 2149 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 2150 { 2151 Sg_scatter_hold *req_schp = &srp->data; 2152 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2153 struct scatterlist *sg = rsv_schp->buffer; 2154 int k, num, rem; 2155 2156 srp->res_used = 1; 2157 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 2158 rem = size; 2159 2160 for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) { 2161 num = sg->length; 2162 if (rem <= num) { 2163 sfp->save_scat_len = num; 2164 sg->length = rem; 2165 req_schp->k_use_sg = k + 1; 2166 req_schp->sglist_len = rsv_schp->sglist_len; 2167 req_schp->buffer = rsv_schp->buffer; 2168 2169 req_schp->bufflen = size; 2170 req_schp->b_malloc_len = rsv_schp->b_malloc_len; 2171 break; 2172 } else 2173 rem -= num; 2174 } 2175 2176 if (k >= rsv_schp->k_use_sg) 2177 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 2178 } 2179 2180 static void 2181 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 2182 { 2183 Sg_scatter_hold *req_schp = &srp->data; 2184 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2185 2186 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 2187 (int) req_schp->k_use_sg)); 2188 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { 2189 struct scatterlist *sg = rsv_schp->buffer; 2190 2191 if (sfp->save_scat_len > 0) 2192 (sg + (req_schp->k_use_sg - 1))->length = 2193 (unsigned) sfp->save_scat_len; 2194 else 2195 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); 2196 } 2197 req_schp->k_use_sg = 0; 2198 req_schp->bufflen = 0; 2199 req_schp->buffer = NULL; 2200 req_schp->sglist_len = 0; 2201 sfp->save_scat_len = 0; 2202 srp->res_used = 0; 2203 } 2204 2205 static Sg_request * 2206 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 2207 { 2208 Sg_request *resp; 2209 unsigned long iflags; 2210 2211 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2212 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 2213 /* look for requests that are ready + not SG_IO owned */ 2214 if ((1 == resp->done) && (!resp->sg_io_owned) && 2215 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 2216 resp->done = 2; /* guard against other readers */ 2217 break; 2218 } 2219 } 2220 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2221 return resp; 2222 } 2223 2224 #ifdef CONFIG_SCSI_PROC_FS 2225 static Sg_request * 2226 sg_get_nth_request(Sg_fd * sfp, int nth) 2227 { 2228 Sg_request *resp; 2229 unsigned long iflags; 2230 int k; 2231 2232 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2233 for (k = 0, resp = sfp->headrp; resp && (k < nth); 2234 ++k, resp = resp->nextrp) ; 2235 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2236 return resp; 2237 } 2238 #endif 2239 2240 /* always adds to end of list */ 2241 static Sg_request * 2242 sg_add_request(Sg_fd * sfp) 2243 { 2244 int k; 2245 unsigned long iflags; 2246 Sg_request *resp; 2247 Sg_request *rp = sfp->req_arr; 2248 2249 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2250 resp = sfp->headrp; 2251 if (!resp) { 2252 memset(rp, 0, sizeof (Sg_request)); 2253 rp->parentfp = sfp; 2254 resp = rp; 2255 sfp->headrp = resp; 2256 } else { 2257 if (0 == sfp->cmd_q) 2258 resp = NULL; /* command queuing disallowed */ 2259 else { 2260 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2261 if (!rp->parentfp) 2262 break; 2263 } 2264 if (k < SG_MAX_QUEUE) { 2265 memset(rp, 0, sizeof (Sg_request)); 2266 rp->parentfp = sfp; 2267 while (resp->nextrp) 2268 resp = resp->nextrp; 2269 resp->nextrp = rp; 2270 resp = rp; 2271 } else 2272 resp = NULL; 2273 } 2274 } 2275 if (resp) { 2276 resp->nextrp = NULL; 2277 resp->header.duration = jiffies_to_msecs(jiffies); 2278 } 2279 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2280 return resp; 2281 } 2282 2283 /* Return of 1 for found; 0 for not found */ 2284 static int 2285 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2286 { 2287 Sg_request *prev_rp; 2288 Sg_request *rp; 2289 unsigned long iflags; 2290 int res = 0; 2291 2292 if ((!sfp) || (!srp) || (!sfp->headrp)) 2293 return res; 2294 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2295 prev_rp = sfp->headrp; 2296 if (srp == prev_rp) { 2297 sfp->headrp = prev_rp->nextrp; 2298 prev_rp->parentfp = NULL; 2299 res = 1; 2300 } else { 2301 while ((rp = prev_rp->nextrp)) { 2302 if (srp == rp) { 2303 prev_rp->nextrp = rp->nextrp; 2304 rp->parentfp = NULL; 2305 res = 1; 2306 break; 2307 } 2308 prev_rp = rp; 2309 } 2310 } 2311 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2312 return res; 2313 } 2314 2315 #ifdef CONFIG_SCSI_PROC_FS 2316 static Sg_fd * 2317 sg_get_nth_sfp(Sg_device * sdp, int nth) 2318 { 2319 Sg_fd *resp; 2320 unsigned long iflags; 2321 int k; 2322 2323 read_lock_irqsave(&sg_index_lock, iflags); 2324 for (k = 0, resp = sdp->headfp; resp && (k < nth); 2325 ++k, resp = resp->nextfp) ; 2326 read_unlock_irqrestore(&sg_index_lock, iflags); 2327 return resp; 2328 } 2329 #endif 2330 2331 static Sg_fd * 2332 sg_add_sfp(Sg_device * sdp, int dev) 2333 { 2334 Sg_fd *sfp; 2335 unsigned long iflags; 2336 int bufflen; 2337 2338 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2339 if (!sfp) 2340 return NULL; 2341 2342 init_waitqueue_head(&sfp->read_wait); 2343 rwlock_init(&sfp->rq_list_lock); 2344 2345 sfp->timeout = SG_DEFAULT_TIMEOUT; 2346 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2347 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2348 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2349 sdp->device->host->unchecked_isa_dma : 1; 2350 sfp->cmd_q = SG_DEF_COMMAND_Q; 2351 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2352 sfp->parentdp = sdp; 2353 write_lock_irqsave(&sg_index_lock, iflags); 2354 if (!sdp->headfp) 2355 sdp->headfp = sfp; 2356 else { /* add to tail of existing list */ 2357 Sg_fd *pfp = sdp->headfp; 2358 while (pfp->nextfp) 2359 pfp = pfp->nextfp; 2360 pfp->nextfp = sfp; 2361 } 2362 write_unlock_irqrestore(&sg_index_lock, iflags); 2363 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2364 if (unlikely(sg_big_buff != def_reserved_size)) 2365 sg_big_buff = def_reserved_size; 2366 2367 bufflen = min_t(int, sg_big_buff, 2368 sdp->device->request_queue->max_sectors * 512); 2369 sg_build_reserve(sfp, bufflen); 2370 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2371 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2372 return sfp; 2373 } 2374 2375 static void 2376 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2377 { 2378 Sg_fd *fp; 2379 Sg_fd *prev_fp; 2380 2381 prev_fp = sdp->headfp; 2382 if (sfp == prev_fp) 2383 sdp->headfp = prev_fp->nextfp; 2384 else { 2385 while ((fp = prev_fp->nextfp)) { 2386 if (sfp == fp) { 2387 prev_fp->nextfp = fp->nextfp; 2388 break; 2389 } 2390 prev_fp = fp; 2391 } 2392 } 2393 if (sfp->reserve.bufflen > 0) { 2394 SCSI_LOG_TIMEOUT(6, 2395 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2396 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); 2397 sg_remove_scat(&sfp->reserve); 2398 } 2399 sfp->parentdp = NULL; 2400 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); 2401 kfree(sfp); 2402 } 2403 2404 /* Returns 0 in normal case, 1 when detached and sdp object removed */ 2405 static int 2406 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2407 { 2408 Sg_request *srp; 2409 Sg_request *tsrp; 2410 int dirty = 0; 2411 int res = 0; 2412 2413 for (srp = sfp->headrp; srp; srp = tsrp) { 2414 tsrp = srp->nextrp; 2415 if (sg_srp_done(srp, sfp)) 2416 sg_finish_rem_req(srp); 2417 else 2418 ++dirty; 2419 } 2420 if (0 == dirty) { 2421 unsigned long iflags; 2422 2423 write_lock_irqsave(&sg_index_lock, iflags); 2424 __sg_remove_sfp(sdp, sfp); 2425 if (sdp->detached && (NULL == sdp->headfp)) { 2426 idr_remove(&sg_index_idr, sdp->index); 2427 kfree(sdp); 2428 res = 1; 2429 } 2430 write_unlock_irqrestore(&sg_index_lock, iflags); 2431 } else { 2432 /* MOD_INC's to inhibit unloading sg and associated adapter driver */ 2433 /* only bump the access_count if we actually succeeded in 2434 * throwing another counter on the host module */ 2435 scsi_device_get(sdp->device); /* XXX: retval ignored? */ 2436 sfp->closed = 1; /* flag dirty state on this fd */ 2437 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", 2438 dirty)); 2439 } 2440 return res; 2441 } 2442 2443 static int 2444 sg_res_in_use(Sg_fd * sfp) 2445 { 2446 const Sg_request *srp; 2447 unsigned long iflags; 2448 2449 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2450 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2451 if (srp->res_used) 2452 break; 2453 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2454 return srp ? 1 : 0; 2455 } 2456 2457 /* The size fetched (value output via retSzp) set when non-NULL return */ 2458 static struct page * 2459 sg_page_malloc(int rqSz, int lowDma, int *retSzp) 2460 { 2461 struct page *resp = NULL; 2462 gfp_t page_mask; 2463 int order, a_size; 2464 int resSz; 2465 2466 if ((rqSz <= 0) || (NULL == retSzp)) 2467 return resp; 2468 2469 if (lowDma) 2470 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN; 2471 else 2472 page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 2473 2474 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; 2475 order++, a_size <<= 1) ; 2476 resSz = a_size; /* rounded up if necessary */ 2477 resp = alloc_pages(page_mask, order); 2478 while ((!resp) && order) { 2479 --order; 2480 a_size >>= 1; /* divide by 2, until PAGE_SIZE */ 2481 resp = alloc_pages(page_mask, order); /* try half */ 2482 resSz = a_size; 2483 } 2484 if (resp) { 2485 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2486 memset(page_address(resp), 0, resSz); 2487 *retSzp = resSz; 2488 } 2489 return resp; 2490 } 2491 2492 static void 2493 sg_page_free(struct page *page, int size) 2494 { 2495 int order, a_size; 2496 2497 if (!page) 2498 return; 2499 for (order = 0, a_size = PAGE_SIZE; a_size < size; 2500 order++, a_size <<= 1) ; 2501 __free_pages(page, order); 2502 } 2503 2504 #ifndef MAINTENANCE_IN_CMD 2505 #define MAINTENANCE_IN_CMD 0xa3 2506 #endif 2507 2508 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, 2509 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, 2510 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, 2511 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD 2512 }; 2513 2514 static int 2515 sg_allow_access(unsigned char opcode, char dev_type) 2516 { 2517 int k; 2518 2519 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */ 2520 return 1; 2521 for (k = 0; k < sizeof (allow_ops); ++k) { 2522 if (opcode == allow_ops[k]) 2523 return 1; 2524 } 2525 return 0; 2526 } 2527 2528 #ifdef CONFIG_SCSI_PROC_FS 2529 static int 2530 sg_idr_max_id(int id, void *p, void *data) 2531 { 2532 int *k = data; 2533 2534 if (*k < id) 2535 *k = id; 2536 2537 return 0; 2538 } 2539 2540 static int 2541 sg_last_dev(void) 2542 { 2543 int k = -1; 2544 unsigned long iflags; 2545 2546 read_lock_irqsave(&sg_index_lock, iflags); 2547 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2548 read_unlock_irqrestore(&sg_index_lock, iflags); 2549 return k + 1; /* origin 1 */ 2550 } 2551 #endif 2552 2553 static Sg_device * 2554 sg_get_dev(int dev) 2555 { 2556 Sg_device *sdp; 2557 unsigned long iflags; 2558 2559 read_lock_irqsave(&sg_index_lock, iflags); 2560 sdp = idr_find(&sg_index_idr, dev); 2561 read_unlock_irqrestore(&sg_index_lock, iflags); 2562 2563 return sdp; 2564 } 2565 2566 #ifdef CONFIG_SCSI_PROC_FS 2567 2568 static struct proc_dir_entry *sg_proc_sgp = NULL; 2569 2570 static char sg_proc_sg_dirname[] = "scsi/sg"; 2571 2572 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2573 2574 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2575 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2576 size_t count, loff_t *off); 2577 static struct file_operations adio_fops = { 2578 /* .owner, .read and .llseek added in sg_proc_init() */ 2579 .open = sg_proc_single_open_adio, 2580 .write = sg_proc_write_adio, 2581 .release = single_release, 2582 }; 2583 2584 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2585 static ssize_t sg_proc_write_dressz(struct file *filp, 2586 const char __user *buffer, size_t count, loff_t *off); 2587 static struct file_operations dressz_fops = { 2588 .open = sg_proc_single_open_dressz, 2589 .write = sg_proc_write_dressz, 2590 .release = single_release, 2591 }; 2592 2593 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2594 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2595 static struct file_operations version_fops = { 2596 .open = sg_proc_single_open_version, 2597 .release = single_release, 2598 }; 2599 2600 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2601 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2602 static struct file_operations devhdr_fops = { 2603 .open = sg_proc_single_open_devhdr, 2604 .release = single_release, 2605 }; 2606 2607 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2608 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2609 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2610 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2611 static void dev_seq_stop(struct seq_file *s, void *v); 2612 static struct file_operations dev_fops = { 2613 .open = sg_proc_open_dev, 2614 .release = seq_release, 2615 }; 2616 static struct seq_operations dev_seq_ops = { 2617 .start = dev_seq_start, 2618 .next = dev_seq_next, 2619 .stop = dev_seq_stop, 2620 .show = sg_proc_seq_show_dev, 2621 }; 2622 2623 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2624 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2625 static struct file_operations devstrs_fops = { 2626 .open = sg_proc_open_devstrs, 2627 .release = seq_release, 2628 }; 2629 static struct seq_operations devstrs_seq_ops = { 2630 .start = dev_seq_start, 2631 .next = dev_seq_next, 2632 .stop = dev_seq_stop, 2633 .show = sg_proc_seq_show_devstrs, 2634 }; 2635 2636 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2637 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2638 static struct file_operations debug_fops = { 2639 .open = sg_proc_open_debug, 2640 .release = seq_release, 2641 }; 2642 static struct seq_operations debug_seq_ops = { 2643 .start = dev_seq_start, 2644 .next = dev_seq_next, 2645 .stop = dev_seq_stop, 2646 .show = sg_proc_seq_show_debug, 2647 }; 2648 2649 2650 struct sg_proc_leaf { 2651 const char * name; 2652 struct file_operations * fops; 2653 }; 2654 2655 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2656 {"allow_dio", &adio_fops}, 2657 {"debug", &debug_fops}, 2658 {"def_reserved_size", &dressz_fops}, 2659 {"device_hdr", &devhdr_fops}, 2660 {"devices", &dev_fops}, 2661 {"device_strs", &devstrs_fops}, 2662 {"version", &version_fops} 2663 }; 2664 2665 static int 2666 sg_proc_init(void) 2667 { 2668 int k, mask; 2669 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2670 struct sg_proc_leaf * leaf; 2671 2672 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2673 if (!sg_proc_sgp) 2674 return 1; 2675 for (k = 0; k < num_leaves; ++k) { 2676 leaf = &sg_proc_leaf_arr[k]; 2677 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2678 leaf->fops->owner = THIS_MODULE; 2679 leaf->fops->read = seq_read; 2680 leaf->fops->llseek = seq_lseek; 2681 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); 2682 } 2683 return 0; 2684 } 2685 2686 static void 2687 sg_proc_cleanup(void) 2688 { 2689 int k; 2690 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2691 2692 if (!sg_proc_sgp) 2693 return; 2694 for (k = 0; k < num_leaves; ++k) 2695 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2696 remove_proc_entry(sg_proc_sg_dirname, NULL); 2697 } 2698 2699 2700 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2701 { 2702 seq_printf(s, "%d\n", *((int *)s->private)); 2703 return 0; 2704 } 2705 2706 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2707 { 2708 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2709 } 2710 2711 static ssize_t 2712 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2713 size_t count, loff_t *off) 2714 { 2715 int num; 2716 char buff[11]; 2717 2718 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2719 return -EACCES; 2720 num = (count < 10) ? count : 10; 2721 if (copy_from_user(buff, buffer, num)) 2722 return -EFAULT; 2723 buff[num] = '\0'; 2724 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2725 return count; 2726 } 2727 2728 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2729 { 2730 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2731 } 2732 2733 static ssize_t 2734 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2735 size_t count, loff_t *off) 2736 { 2737 int num; 2738 unsigned long k = ULONG_MAX; 2739 char buff[11]; 2740 2741 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2742 return -EACCES; 2743 num = (count < 10) ? count : 10; 2744 if (copy_from_user(buff, buffer, num)) 2745 return -EFAULT; 2746 buff[num] = '\0'; 2747 k = simple_strtoul(buff, NULL, 10); 2748 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2749 sg_big_buff = k; 2750 return count; 2751 } 2752 return -ERANGE; 2753 } 2754 2755 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2756 { 2757 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2758 sg_version_date); 2759 return 0; 2760 } 2761 2762 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2763 { 2764 return single_open(file, sg_proc_seq_show_version, NULL); 2765 } 2766 2767 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2768 { 2769 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2770 "online\n"); 2771 return 0; 2772 } 2773 2774 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2775 { 2776 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2777 } 2778 2779 struct sg_proc_deviter { 2780 loff_t index; 2781 size_t max; 2782 }; 2783 2784 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2785 { 2786 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2787 2788 s->private = it; 2789 if (! it) 2790 return NULL; 2791 2792 it->index = *pos; 2793 it->max = sg_last_dev(); 2794 if (it->index >= it->max) 2795 return NULL; 2796 return it; 2797 } 2798 2799 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2800 { 2801 struct sg_proc_deviter * it = s->private; 2802 2803 *pos = ++it->index; 2804 return (it->index < it->max) ? it : NULL; 2805 } 2806 2807 static void dev_seq_stop(struct seq_file *s, void *v) 2808 { 2809 kfree(s->private); 2810 } 2811 2812 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2813 { 2814 return seq_open(file, &dev_seq_ops); 2815 } 2816 2817 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2818 { 2819 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2820 Sg_device *sdp; 2821 struct scsi_device *scsidp; 2822 2823 sdp = it ? sg_get_dev(it->index) : NULL; 2824 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2825 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2826 scsidp->host->host_no, scsidp->channel, 2827 scsidp->id, scsidp->lun, (int) scsidp->type, 2828 1, 2829 (int) scsidp->queue_depth, 2830 (int) scsidp->device_busy, 2831 (int) scsi_device_online(scsidp)); 2832 else 2833 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2834 return 0; 2835 } 2836 2837 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2838 { 2839 return seq_open(file, &devstrs_seq_ops); 2840 } 2841 2842 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2843 { 2844 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2845 Sg_device *sdp; 2846 struct scsi_device *scsidp; 2847 2848 sdp = it ? sg_get_dev(it->index) : NULL; 2849 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2850 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2851 scsidp->vendor, scsidp->model, scsidp->rev); 2852 else 2853 seq_printf(s, "<no active device>\n"); 2854 return 0; 2855 } 2856 2857 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2858 { 2859 int k, m, new_interface, blen, usg; 2860 Sg_request *srp; 2861 Sg_fd *fp; 2862 const sg_io_hdr_t *hp; 2863 const char * cp; 2864 unsigned int ms; 2865 2866 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { 2867 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2868 "(res)sgat=%d low_dma=%d\n", k + 1, 2869 jiffies_to_msecs(fp->timeout), 2870 fp->reserve.bufflen, 2871 (int) fp->reserve.k_use_sg, 2872 (int) fp->low_dma); 2873 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2874 (int) fp->cmd_q, (int) fp->force_packid, 2875 (int) fp->keep_orphan, (int) fp->closed); 2876 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { 2877 hp = &srp->header; 2878 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2879 if (srp->res_used) { 2880 if (new_interface && 2881 (SG_FLAG_MMAP_IO & hp->flags)) 2882 cp = " mmap>> "; 2883 else 2884 cp = " rb>> "; 2885 } else { 2886 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2887 cp = " dio>> "; 2888 else 2889 cp = " "; 2890 } 2891 seq_printf(s, cp); 2892 blen = srp->data.bufflen; 2893 usg = srp->data.k_use_sg; 2894 seq_printf(s, srp->done ? 2895 ((1 == srp->done) ? "rcv:" : "fin:") 2896 : "act:"); 2897 seq_printf(s, " id=%d blen=%d", 2898 srp->header.pack_id, blen); 2899 if (srp->done) 2900 seq_printf(s, " dur=%d", hp->duration); 2901 else { 2902 ms = jiffies_to_msecs(jiffies); 2903 seq_printf(s, " t_o/elap=%d/%d", 2904 (new_interface ? hp->timeout : 2905 jiffies_to_msecs(fp->timeout)), 2906 (ms > hp->duration ? ms - hp->duration : 0)); 2907 } 2908 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2909 (int) srp->data.cmd_opcode); 2910 } 2911 if (0 == m) 2912 seq_printf(s, " No requests active\n"); 2913 } 2914 } 2915 2916 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2917 { 2918 return seq_open(file, &debug_seq_ops); 2919 } 2920 2921 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2922 { 2923 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2924 Sg_device *sdp; 2925 2926 if (it && (0 == it->index)) { 2927 seq_printf(s, "max_active_device=%d(origin 1)\n", 2928 (int)it->max); 2929 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2930 } 2931 sdp = it ? sg_get_dev(it->index) : NULL; 2932 if (sdp) { 2933 struct scsi_device *scsidp = sdp->device; 2934 2935 if (NULL == scsidp) { 2936 seq_printf(s, "device %d detached ??\n", 2937 (int)it->index); 2938 return 0; 2939 } 2940 2941 if (sg_get_nth_sfp(sdp, 0)) { 2942 seq_printf(s, " >>> device=%s ", 2943 sdp->disk->disk_name); 2944 if (sdp->detached) 2945 seq_printf(s, "detached pending close "); 2946 else 2947 seq_printf 2948 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2949 scsidp->host->host_no, 2950 scsidp->channel, scsidp->id, 2951 scsidp->lun, 2952 scsidp->host->hostt->emulated); 2953 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2954 sdp->sg_tablesize, sdp->exclude); 2955 } 2956 sg_proc_debug_helper(s, sdp); 2957 } 2958 return 0; 2959 } 2960 2961 #endif /* CONFIG_SCSI_PROC_FS */ 2962 2963 module_init(init_sg); 2964 module_exit(exit_sg); 2965