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 #include <linux/smp_lock.h> 53 54 #include "scsi.h" 55 #include <scsi/scsi_dbg.h> 56 #include <scsi/scsi_host.h> 57 #include <scsi/scsi_driver.h> 58 #include <scsi/scsi_ioctl.h> 59 #include <scsi/sg.h> 60 61 #include "scsi_logging.h" 62 63 #ifdef CONFIG_SCSI_PROC_FS 64 #include <linux/proc_fs.h> 65 static char *sg_version_date = "20061027"; 66 67 static int sg_proc_init(void); 68 static void sg_proc_cleanup(void); 69 #endif 70 71 #define SG_ALLOW_DIO_DEF 0 72 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */ 73 74 #define SG_MAX_DEVS 32768 75 76 /* 77 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 78 * Then when using 32 bit integers x * m may overflow during the calculation. 79 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 80 * calculates the same, but prevents the overflow when both m and d 81 * are "small" numbers (like HZ and USER_HZ). 82 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 83 * in 32 bits. 84 */ 85 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 86 87 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 88 89 int sg_big_buff = SG_DEF_RESERVED_SIZE; 90 /* N.B. This variable is readable and writeable via 91 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 92 of this size (or less if there is not enough memory) will be reserved 93 for use by this file descriptor. [Deprecated usage: this variable is also 94 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 95 the kernel (i.e. it is not a module).] */ 96 static int def_reserved_size = -1; /* picks up init parameter */ 97 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 98 99 static int scatter_elem_sz = SG_SCATTER_SZ; 100 static int scatter_elem_sz_prev = SG_SCATTER_SZ; 101 102 #define SG_SECTOR_SZ 512 103 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) 104 105 static int sg_add(struct device *, struct class_interface *); 106 static void sg_remove(struct device *, struct class_interface *); 107 108 static DEFINE_IDR(sg_index_idr); 109 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock 110 file descriptor list for device */ 111 112 static struct class_interface sg_interface = { 113 .add_dev = sg_add, 114 .remove_dev = sg_remove, 115 }; 116 117 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 118 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 119 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ 120 unsigned bufflen; /* Size of (aggregate) data buffer */ 121 unsigned b_malloc_len; /* actual len malloc'ed in buffer */ 122 struct scatterlist *buffer;/* scatter list */ 123 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 124 unsigned char cmd_opcode; /* first byte of command */ 125 } Sg_scatter_hold; 126 127 struct sg_device; /* forward declarations */ 128 struct sg_fd; 129 130 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 131 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 132 struct sg_fd *parentfp; /* NULL -> not in use */ 133 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 134 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 135 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; 136 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 137 char orphan; /* 1 -> drop on sight, 0 -> normal */ 138 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 139 volatile char done; /* 0->before bh, 1->before read, 2->read */ 140 } Sg_request; 141 142 typedef struct sg_fd { /* holds the state of a file descriptor */ 143 struct sg_fd *nextfp; /* NULL when last opened fd on this device */ 144 struct sg_device *parentdp; /* owning device */ 145 wait_queue_head_t read_wait; /* queue read until command done */ 146 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 147 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 148 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 149 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 150 unsigned save_scat_len; /* original length of trunc. scat. element */ 151 Sg_request *headrp; /* head of request slist, NULL->empty */ 152 struct fasync_struct *async_qp; /* used by asynchronous notification */ 153 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 154 char low_dma; /* as in parent but possibly overridden to 1 */ 155 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 156 volatile char closed; /* 1 -> fd closed but request(s) outstanding */ 157 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 158 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ 159 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 160 char mmap_called; /* 0 -> mmap() never called on this fd */ 161 } Sg_fd; 162 163 typedef struct sg_device { /* holds the state of each scsi generic device */ 164 struct scsi_device *device; 165 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ 166 int sg_tablesize; /* adapter's max scatter-gather table size */ 167 u32 index; /* device index number */ 168 Sg_fd *headfp; /* first open fd belonging to this device */ 169 volatile char detached; /* 0->attached, 1->detached pending removal */ 170 volatile char exclude; /* opened for exclusive access */ 171 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 172 struct gendisk *disk; 173 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 174 } Sg_device; 175 176 static int sg_fasync(int fd, struct file *filp, int mode); 177 /* tasklet or soft irq callback */ 178 static void sg_cmd_done(void *data, char *sense, int result, int resid); 179 static int sg_start_req(Sg_request * srp); 180 static void sg_finish_rem_req(Sg_request * srp); 181 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 182 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, 183 int tablesize); 184 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 185 Sg_request * srp); 186 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, 187 const char __user *buf, size_t count, int blocking, 188 int read_only, Sg_request **o_srp); 189 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 190 unsigned char *cmnd, int timeout, int blocking); 191 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 192 int wr_xf, int *countp, unsigned char __user **up); 193 static int sg_write_xfer(Sg_request * srp); 194 static int sg_read_xfer(Sg_request * srp); 195 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 196 static void sg_remove_scat(Sg_scatter_hold * schp); 197 static void sg_build_reserve(Sg_fd * sfp, int req_size); 198 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 199 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 200 static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp); 201 static void sg_page_free(struct page *page, int size); 202 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 203 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 204 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 205 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 206 static Sg_request *sg_add_request(Sg_fd * sfp); 207 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 208 static int sg_res_in_use(Sg_fd * sfp); 209 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); 210 static Sg_device *sg_get_dev(int dev); 211 #ifdef CONFIG_SCSI_PROC_FS 212 static int sg_last_dev(void); 213 #endif 214 215 #define SZ_SG_HEADER sizeof(struct sg_header) 216 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 217 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 218 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 219 220 static int 221 sg_open(struct inode *inode, struct file *filp) 222 { 223 int dev = iminor(inode); 224 int flags = filp->f_flags; 225 struct request_queue *q; 226 Sg_device *sdp; 227 Sg_fd *sfp; 228 int res; 229 int retval; 230 231 lock_kernel(); 232 nonseekable_open(inode, filp); 233 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 234 sdp = sg_get_dev(dev); 235 if ((!sdp) || (!sdp->device)) { 236 unlock_kernel(); 237 return -ENXIO; 238 } 239 if (sdp->detached) { 240 unlock_kernel(); 241 return -ENODEV; 242 } 243 244 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 245 /* Prevent the device driver from vanishing while we sleep */ 246 retval = scsi_device_get(sdp->device); 247 if (retval) { 248 unlock_kernel(); 249 return retval; 250 } 251 252 if (!((flags & O_NONBLOCK) || 253 scsi_block_when_processing_errors(sdp->device))) { 254 retval = -ENXIO; 255 /* we are in error recovery for this device */ 256 goto error_out; 257 } 258 259 if (flags & O_EXCL) { 260 if (O_RDONLY == (flags & O_ACCMODE)) { 261 retval = -EPERM; /* Can't lock it with read only access */ 262 goto error_out; 263 } 264 if (sdp->headfp && (flags & O_NONBLOCK)) { 265 retval = -EBUSY; 266 goto error_out; 267 } 268 res = 0; 269 __wait_event_interruptible(sdp->o_excl_wait, 270 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); 271 if (res) { 272 retval = res; /* -ERESTARTSYS because signal hit process */ 273 goto error_out; 274 } 275 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ 276 if (flags & O_NONBLOCK) { 277 retval = -EBUSY; 278 goto error_out; 279 } 280 res = 0; 281 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), 282 res); 283 if (res) { 284 retval = res; /* -ERESTARTSYS because signal hit process */ 285 goto error_out; 286 } 287 } 288 if (sdp->detached) { 289 retval = -ENODEV; 290 goto error_out; 291 } 292 if (!sdp->headfp) { /* no existing opens on this device */ 293 sdp->sgdebug = 0; 294 q = sdp->device->request_queue; 295 sdp->sg_tablesize = min(q->max_hw_segments, 296 q->max_phys_segments); 297 } 298 if ((sfp = sg_add_sfp(sdp, dev))) 299 filp->private_data = sfp; 300 else { 301 if (flags & O_EXCL) 302 sdp->exclude = 0; /* undo if error */ 303 retval = -ENOMEM; 304 goto error_out; 305 } 306 unlock_kernel(); 307 return 0; 308 309 error_out: 310 scsi_device_put(sdp->device); 311 unlock_kernel(); 312 return retval; 313 } 314 315 /* Following function was formerly called 'sg_close' */ 316 static int 317 sg_release(struct inode *inode, struct file *filp) 318 { 319 Sg_device *sdp; 320 Sg_fd *sfp; 321 322 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 323 return -ENXIO; 324 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 325 sg_fasync(-1, filp, 0); /* remove filp from async notification list */ 326 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ 327 if (!sdp->detached) { 328 scsi_device_put(sdp->device); 329 } 330 sdp->exclude = 0; 331 wake_up_interruptible(&sdp->o_excl_wait); 332 } 333 return 0; 334 } 335 336 static ssize_t 337 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 338 { 339 Sg_device *sdp; 340 Sg_fd *sfp; 341 Sg_request *srp; 342 int req_pack_id = -1; 343 sg_io_hdr_t *hp; 344 struct sg_header *old_hdr = NULL; 345 int retval = 0; 346 347 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 348 return -ENXIO; 349 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 350 sdp->disk->disk_name, (int) count)); 351 352 if (!access_ok(VERIFY_WRITE, buf, count)) 353 return -EFAULT; 354 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 355 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 356 if (!old_hdr) 357 return -ENOMEM; 358 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 359 retval = -EFAULT; 360 goto free_old_hdr; 361 } 362 if (old_hdr->reply_len < 0) { 363 if (count >= SZ_SG_IO_HDR) { 364 sg_io_hdr_t *new_hdr; 365 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 366 if (!new_hdr) { 367 retval = -ENOMEM; 368 goto free_old_hdr; 369 } 370 retval =__copy_from_user 371 (new_hdr, buf, SZ_SG_IO_HDR); 372 req_pack_id = new_hdr->pack_id; 373 kfree(new_hdr); 374 if (retval) { 375 retval = -EFAULT; 376 goto free_old_hdr; 377 } 378 } 379 } else 380 req_pack_id = old_hdr->pack_id; 381 } 382 srp = sg_get_rq_mark(sfp, req_pack_id); 383 if (!srp) { /* now wait on packet to arrive */ 384 if (sdp->detached) { 385 retval = -ENODEV; 386 goto free_old_hdr; 387 } 388 if (filp->f_flags & O_NONBLOCK) { 389 retval = -EAGAIN; 390 goto free_old_hdr; 391 } 392 while (1) { 393 retval = 0; /* following macro beats race condition */ 394 __wait_event_interruptible(sfp->read_wait, 395 (sdp->detached || 396 (srp = sg_get_rq_mark(sfp, req_pack_id))), 397 retval); 398 if (sdp->detached) { 399 retval = -ENODEV; 400 goto free_old_hdr; 401 } 402 if (0 == retval) 403 break; 404 405 /* -ERESTARTSYS as signal hit process */ 406 goto free_old_hdr; 407 } 408 } 409 if (srp->header.interface_id != '\0') { 410 retval = sg_new_read(sfp, buf, count, srp); 411 goto free_old_hdr; 412 } 413 414 hp = &srp->header; 415 if (old_hdr == NULL) { 416 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 417 if (! old_hdr) { 418 retval = -ENOMEM; 419 goto free_old_hdr; 420 } 421 } 422 memset(old_hdr, 0, SZ_SG_HEADER); 423 old_hdr->reply_len = (int) hp->timeout; 424 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 425 old_hdr->pack_id = hp->pack_id; 426 old_hdr->twelve_byte = 427 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 428 old_hdr->target_status = hp->masked_status; 429 old_hdr->host_status = hp->host_status; 430 old_hdr->driver_status = hp->driver_status; 431 if ((CHECK_CONDITION & hp->masked_status) || 432 (DRIVER_SENSE & hp->driver_status)) 433 memcpy(old_hdr->sense_buffer, srp->sense_b, 434 sizeof (old_hdr->sense_buffer)); 435 switch (hp->host_status) { 436 /* This setup of 'result' is for backward compatibility and is best 437 ignored by the user who should use target, host + driver status */ 438 case DID_OK: 439 case DID_PASSTHROUGH: 440 case DID_SOFT_ERROR: 441 old_hdr->result = 0; 442 break; 443 case DID_NO_CONNECT: 444 case DID_BUS_BUSY: 445 case DID_TIME_OUT: 446 old_hdr->result = EBUSY; 447 break; 448 case DID_BAD_TARGET: 449 case DID_ABORT: 450 case DID_PARITY: 451 case DID_RESET: 452 case DID_BAD_INTR: 453 old_hdr->result = EIO; 454 break; 455 case DID_ERROR: 456 old_hdr->result = (srp->sense_b[0] == 0 && 457 hp->masked_status == GOOD) ? 0 : EIO; 458 break; 459 default: 460 old_hdr->result = EIO; 461 break; 462 } 463 464 /* Now copy the result back to the user buffer. */ 465 if (count >= SZ_SG_HEADER) { 466 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 467 retval = -EFAULT; 468 goto free_old_hdr; 469 } 470 buf += SZ_SG_HEADER; 471 if (count > old_hdr->reply_len) 472 count = old_hdr->reply_len; 473 if (count > SZ_SG_HEADER) { 474 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 475 retval = -EFAULT; 476 goto free_old_hdr; 477 } 478 } 479 } else 480 count = (old_hdr->result == 0) ? 0 : -EIO; 481 sg_finish_rem_req(srp); 482 retval = count; 483 free_old_hdr: 484 kfree(old_hdr); 485 return retval; 486 } 487 488 static ssize_t 489 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 490 { 491 sg_io_hdr_t *hp = &srp->header; 492 int err = 0; 493 int len; 494 495 if (count < SZ_SG_IO_HDR) { 496 err = -EINVAL; 497 goto err_out; 498 } 499 hp->sb_len_wr = 0; 500 if ((hp->mx_sb_len > 0) && hp->sbp) { 501 if ((CHECK_CONDITION & hp->masked_status) || 502 (DRIVER_SENSE & hp->driver_status)) { 503 int sb_len = SCSI_SENSE_BUFFERSIZE; 504 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 505 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 506 len = (len > sb_len) ? sb_len : len; 507 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 508 err = -EFAULT; 509 goto err_out; 510 } 511 hp->sb_len_wr = len; 512 } 513 } 514 if (hp->masked_status || hp->host_status || hp->driver_status) 515 hp->info |= SG_INFO_CHECK; 516 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 517 err = -EFAULT; 518 goto err_out; 519 } 520 err = sg_read_xfer(srp); 521 err_out: 522 sg_finish_rem_req(srp); 523 return (0 == err) ? count : err; 524 } 525 526 static ssize_t 527 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 528 { 529 int mxsize, cmd_size, k; 530 int input_size, blocking; 531 unsigned char opcode; 532 Sg_device *sdp; 533 Sg_fd *sfp; 534 Sg_request *srp; 535 struct sg_header old_hdr; 536 sg_io_hdr_t *hp; 537 unsigned char cmnd[MAX_COMMAND_SIZE]; 538 539 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 540 return -ENXIO; 541 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 542 sdp->disk->disk_name, (int) count)); 543 if (sdp->detached) 544 return -ENODEV; 545 if (!((filp->f_flags & O_NONBLOCK) || 546 scsi_block_when_processing_errors(sdp->device))) 547 return -ENXIO; 548 549 if (!access_ok(VERIFY_READ, buf, count)) 550 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 551 if (count < SZ_SG_HEADER) 552 return -EIO; 553 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 554 return -EFAULT; 555 blocking = !(filp->f_flags & O_NONBLOCK); 556 if (old_hdr.reply_len < 0) 557 return sg_new_write(sfp, filp, buf, count, blocking, 0, NULL); 558 if (count < (SZ_SG_HEADER + 6)) 559 return -EIO; /* The minimum scsi command length is 6 bytes. */ 560 561 if (!(srp = sg_add_request(sfp))) { 562 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 563 return -EDOM; 564 } 565 buf += SZ_SG_HEADER; 566 __get_user(opcode, buf); 567 if (sfp->next_cmd_len > 0) { 568 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 569 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 570 sfp->next_cmd_len = 0; 571 sg_remove_request(sfp, srp); 572 return -EIO; 573 } 574 cmd_size = sfp->next_cmd_len; 575 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 576 } else { 577 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 578 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 579 cmd_size = 12; 580 } 581 SCSI_LOG_TIMEOUT(4, printk( 582 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 583 /* Determine buffer size. */ 584 input_size = count - cmd_size; 585 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 586 mxsize -= SZ_SG_HEADER; 587 input_size -= SZ_SG_HEADER; 588 if (input_size < 0) { 589 sg_remove_request(sfp, srp); 590 return -EIO; /* User did not pass enough bytes for this command. */ 591 } 592 hp = &srp->header; 593 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 594 hp->cmd_len = (unsigned char) cmd_size; 595 hp->iovec_count = 0; 596 hp->mx_sb_len = 0; 597 if (input_size > 0) 598 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 599 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 600 else 601 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 602 hp->dxfer_len = mxsize; 603 hp->dxferp = (char __user *)buf + cmd_size; 604 hp->sbp = NULL; 605 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 606 hp->flags = input_size; /* structure abuse ... */ 607 hp->pack_id = old_hdr.pack_id; 608 hp->usr_ptr = NULL; 609 if (__copy_from_user(cmnd, buf, cmd_size)) 610 return -EFAULT; 611 /* 612 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 613 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 614 * is a non-zero input_size, so emit a warning. 615 */ 616 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { 617 static char cmd[TASK_COMM_LEN]; 618 if (strcmp(current->comm, cmd) && printk_ratelimit()) { 619 printk(KERN_WARNING 620 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" 621 "guessing data in;\n" KERN_WARNING " " 622 "program %s not setting count and/or reply_len properly\n", 623 old_hdr.reply_len - (int)SZ_SG_HEADER, 624 input_size, (unsigned int) cmnd[0], 625 current->comm); 626 strcpy(cmd, current->comm); 627 } 628 } 629 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 630 return (k < 0) ? k : count; 631 } 632 633 static ssize_t 634 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, 635 size_t count, int blocking, int read_only, 636 Sg_request **o_srp) 637 { 638 int k; 639 Sg_request *srp; 640 sg_io_hdr_t *hp; 641 unsigned char cmnd[MAX_COMMAND_SIZE]; 642 int timeout; 643 unsigned long ul_timeout; 644 645 if (count < SZ_SG_IO_HDR) 646 return -EINVAL; 647 if (!access_ok(VERIFY_READ, buf, count)) 648 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 649 650 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 651 if (!(srp = sg_add_request(sfp))) { 652 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 653 return -EDOM; 654 } 655 hp = &srp->header; 656 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 657 sg_remove_request(sfp, srp); 658 return -EFAULT; 659 } 660 if (hp->interface_id != 'S') { 661 sg_remove_request(sfp, srp); 662 return -ENOSYS; 663 } 664 if (hp->flags & SG_FLAG_MMAP_IO) { 665 if (hp->dxfer_len > sfp->reserve.bufflen) { 666 sg_remove_request(sfp, srp); 667 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 668 } 669 if (hp->flags & SG_FLAG_DIRECT_IO) { 670 sg_remove_request(sfp, srp); 671 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 672 } 673 if (sg_res_in_use(sfp)) { 674 sg_remove_request(sfp, srp); 675 return -EBUSY; /* reserve buffer already being used */ 676 } 677 } 678 ul_timeout = msecs_to_jiffies(srp->header.timeout); 679 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 680 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 681 sg_remove_request(sfp, srp); 682 return -EMSGSIZE; 683 } 684 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 685 sg_remove_request(sfp, srp); 686 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 687 } 688 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 689 sg_remove_request(sfp, srp); 690 return -EFAULT; 691 } 692 if (read_only && !blk_verify_command(file, cmnd)) { 693 sg_remove_request(sfp, srp); 694 return -EPERM; 695 } 696 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 697 if (k < 0) 698 return k; 699 if (o_srp) 700 *o_srp = srp; 701 return count; 702 } 703 704 static int 705 sg_common_write(Sg_fd * sfp, Sg_request * srp, 706 unsigned char *cmnd, int timeout, int blocking) 707 { 708 int k, data_dir; 709 Sg_device *sdp = sfp->parentdp; 710 sg_io_hdr_t *hp = &srp->header; 711 712 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 713 hp->status = 0; 714 hp->masked_status = 0; 715 hp->msg_status = 0; 716 hp->info = 0; 717 hp->host_status = 0; 718 hp->driver_status = 0; 719 hp->resid = 0; 720 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 721 (int) cmnd[0], (int) hp->cmd_len)); 722 723 if ((k = sg_start_req(srp))) { 724 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); 725 sg_finish_rem_req(srp); 726 return k; /* probably out of space --> ENOMEM */ 727 } 728 if ((k = sg_write_xfer(srp))) { 729 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n")); 730 sg_finish_rem_req(srp); 731 return k; 732 } 733 if (sdp->detached) { 734 sg_finish_rem_req(srp); 735 return -ENODEV; 736 } 737 738 switch (hp->dxfer_direction) { 739 case SG_DXFER_TO_FROM_DEV: 740 case SG_DXFER_FROM_DEV: 741 data_dir = DMA_FROM_DEVICE; 742 break; 743 case SG_DXFER_TO_DEV: 744 data_dir = DMA_TO_DEVICE; 745 break; 746 case SG_DXFER_UNKNOWN: 747 data_dir = DMA_BIDIRECTIONAL; 748 break; 749 default: 750 data_dir = DMA_NONE; 751 break; 752 } 753 hp->duration = jiffies_to_msecs(jiffies); 754 /* Now send everything of to mid-level. The next time we hear about this 755 packet is when sg_cmd_done() is called (i.e. a callback). */ 756 if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer, 757 hp->dxfer_len, srp->data.k_use_sg, timeout, 758 SG_DEFAULT_RETRIES, srp, sg_cmd_done, 759 GFP_ATOMIC)) { 760 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n")); 761 /* 762 * most likely out of mem, but could also be a bad map 763 */ 764 sg_finish_rem_req(srp); 765 return -ENOMEM; 766 } else 767 return 0; 768 } 769 770 static int 771 sg_srp_done(Sg_request *srp, Sg_fd *sfp) 772 { 773 unsigned long iflags; 774 int done; 775 776 read_lock_irqsave(&sfp->rq_list_lock, iflags); 777 done = srp->done; 778 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 779 return done; 780 } 781 782 static int 783 sg_ioctl(struct inode *inode, struct file *filp, 784 unsigned int cmd_in, unsigned long arg) 785 { 786 void __user *p = (void __user *)arg; 787 int __user *ip = p; 788 int result, val, read_only; 789 Sg_device *sdp; 790 Sg_fd *sfp; 791 Sg_request *srp; 792 unsigned long iflags; 793 794 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 795 return -ENXIO; 796 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 797 sdp->disk->disk_name, (int) cmd_in)); 798 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 799 800 switch (cmd_in) { 801 case SG_IO: 802 { 803 int blocking = 1; /* ignore O_NONBLOCK flag */ 804 805 if (sdp->detached) 806 return -ENODEV; 807 if (!scsi_block_when_processing_errors(sdp->device)) 808 return -ENXIO; 809 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 810 return -EFAULT; 811 result = 812 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, 813 blocking, read_only, &srp); 814 if (result < 0) 815 return result; 816 srp->sg_io_owned = 1; 817 while (1) { 818 result = 0; /* following macro to beat race condition */ 819 __wait_event_interruptible(sfp->read_wait, 820 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), 821 result); 822 if (sdp->detached) 823 return -ENODEV; 824 if (sfp->closed) 825 return 0; /* request packet dropped already */ 826 if (0 == result) 827 break; 828 srp->orphan = 1; 829 return result; /* -ERESTARTSYS because signal hit process */ 830 } 831 write_lock_irqsave(&sfp->rq_list_lock, iflags); 832 srp->done = 2; 833 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 834 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 835 return (result < 0) ? result : 0; 836 } 837 case SG_SET_TIMEOUT: 838 result = get_user(val, ip); 839 if (result) 840 return result; 841 if (val < 0) 842 return -EIO; 843 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 844 val = MULDIV (INT_MAX, USER_HZ, HZ); 845 sfp->timeout_user = val; 846 sfp->timeout = MULDIV (val, HZ, USER_HZ); 847 848 return 0; 849 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 850 /* strange ..., for backward compatibility */ 851 return sfp->timeout_user; 852 case SG_SET_FORCE_LOW_DMA: 853 result = get_user(val, ip); 854 if (result) 855 return result; 856 if (val) { 857 sfp->low_dma = 1; 858 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 859 val = (int) sfp->reserve.bufflen; 860 sg_remove_scat(&sfp->reserve); 861 sg_build_reserve(sfp, val); 862 } 863 } else { 864 if (sdp->detached) 865 return -ENODEV; 866 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 867 } 868 return 0; 869 case SG_GET_LOW_DMA: 870 return put_user((int) sfp->low_dma, ip); 871 case SG_GET_SCSI_ID: 872 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 873 return -EFAULT; 874 else { 875 sg_scsi_id_t __user *sg_idp = p; 876 877 if (sdp->detached) 878 return -ENODEV; 879 __put_user((int) sdp->device->host->host_no, 880 &sg_idp->host_no); 881 __put_user((int) sdp->device->channel, 882 &sg_idp->channel); 883 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 884 __put_user((int) sdp->device->lun, &sg_idp->lun); 885 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 886 __put_user((short) sdp->device->host->cmd_per_lun, 887 &sg_idp->h_cmd_per_lun); 888 __put_user((short) sdp->device->queue_depth, 889 &sg_idp->d_queue_depth); 890 __put_user(0, &sg_idp->unused[0]); 891 __put_user(0, &sg_idp->unused[1]); 892 return 0; 893 } 894 case SG_SET_FORCE_PACK_ID: 895 result = get_user(val, ip); 896 if (result) 897 return result; 898 sfp->force_packid = val ? 1 : 0; 899 return 0; 900 case SG_GET_PACK_ID: 901 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 902 return -EFAULT; 903 read_lock_irqsave(&sfp->rq_list_lock, iflags); 904 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 905 if ((1 == srp->done) && (!srp->sg_io_owned)) { 906 read_unlock_irqrestore(&sfp->rq_list_lock, 907 iflags); 908 __put_user(srp->header.pack_id, ip); 909 return 0; 910 } 911 } 912 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 913 __put_user(-1, ip); 914 return 0; 915 case SG_GET_NUM_WAITING: 916 read_lock_irqsave(&sfp->rq_list_lock, iflags); 917 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 918 if ((1 == srp->done) && (!srp->sg_io_owned)) 919 ++val; 920 } 921 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 922 return put_user(val, ip); 923 case SG_GET_SG_TABLESIZE: 924 return put_user(sdp->sg_tablesize, ip); 925 case SG_SET_RESERVED_SIZE: 926 result = get_user(val, ip); 927 if (result) 928 return result; 929 if (val < 0) 930 return -EINVAL; 931 val = min_t(int, val, 932 sdp->device->request_queue->max_sectors * 512); 933 if (val != sfp->reserve.bufflen) { 934 if (sg_res_in_use(sfp) || sfp->mmap_called) 935 return -EBUSY; 936 sg_remove_scat(&sfp->reserve); 937 sg_build_reserve(sfp, val); 938 } 939 return 0; 940 case SG_GET_RESERVED_SIZE: 941 val = min_t(int, sfp->reserve.bufflen, 942 sdp->device->request_queue->max_sectors * 512); 943 return put_user(val, ip); 944 case SG_SET_COMMAND_Q: 945 result = get_user(val, ip); 946 if (result) 947 return result; 948 sfp->cmd_q = val ? 1 : 0; 949 return 0; 950 case SG_GET_COMMAND_Q: 951 return put_user((int) sfp->cmd_q, ip); 952 case SG_SET_KEEP_ORPHAN: 953 result = get_user(val, ip); 954 if (result) 955 return result; 956 sfp->keep_orphan = val; 957 return 0; 958 case SG_GET_KEEP_ORPHAN: 959 return put_user((int) sfp->keep_orphan, ip); 960 case SG_NEXT_CMD_LEN: 961 result = get_user(val, ip); 962 if (result) 963 return result; 964 sfp->next_cmd_len = (val > 0) ? val : 0; 965 return 0; 966 case SG_GET_VERSION_NUM: 967 return put_user(sg_version_num, ip); 968 case SG_GET_ACCESS_COUNT: 969 /* faked - we don't have a real access count anymore */ 970 val = (sdp->device ? 1 : 0); 971 return put_user(val, ip); 972 case SG_GET_REQUEST_TABLE: 973 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 974 return -EFAULT; 975 else { 976 sg_req_info_t *rinfo; 977 unsigned int ms; 978 979 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 980 GFP_KERNEL); 981 if (!rinfo) 982 return -ENOMEM; 983 read_lock_irqsave(&sfp->rq_list_lock, iflags); 984 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 985 ++val, srp = srp ? srp->nextrp : srp) { 986 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 987 if (srp) { 988 rinfo[val].req_state = srp->done + 1; 989 rinfo[val].problem = 990 srp->header.masked_status & 991 srp->header.host_status & 992 srp->header.driver_status; 993 if (srp->done) 994 rinfo[val].duration = 995 srp->header.duration; 996 else { 997 ms = jiffies_to_msecs(jiffies); 998 rinfo[val].duration = 999 (ms > srp->header.duration) ? 1000 (ms - srp->header.duration) : 0; 1001 } 1002 rinfo[val].orphan = srp->orphan; 1003 rinfo[val].sg_io_owned = 1004 srp->sg_io_owned; 1005 rinfo[val].pack_id = 1006 srp->header.pack_id; 1007 rinfo[val].usr_ptr = 1008 srp->header.usr_ptr; 1009 } 1010 } 1011 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1012 result = __copy_to_user(p, rinfo, 1013 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 1014 result = result ? -EFAULT : 0; 1015 kfree(rinfo); 1016 return result; 1017 } 1018 case SG_EMULATED_HOST: 1019 if (sdp->detached) 1020 return -ENODEV; 1021 return put_user(sdp->device->host->hostt->emulated, ip); 1022 case SG_SCSI_RESET: 1023 if (sdp->detached) 1024 return -ENODEV; 1025 if (filp->f_flags & O_NONBLOCK) { 1026 if (scsi_host_in_recovery(sdp->device->host)) 1027 return -EBUSY; 1028 } else if (!scsi_block_when_processing_errors(sdp->device)) 1029 return -EBUSY; 1030 result = get_user(val, ip); 1031 if (result) 1032 return result; 1033 if (SG_SCSI_RESET_NOTHING == val) 1034 return 0; 1035 switch (val) { 1036 case SG_SCSI_RESET_DEVICE: 1037 val = SCSI_TRY_RESET_DEVICE; 1038 break; 1039 case SG_SCSI_RESET_TARGET: 1040 val = SCSI_TRY_RESET_TARGET; 1041 break; 1042 case SG_SCSI_RESET_BUS: 1043 val = SCSI_TRY_RESET_BUS; 1044 break; 1045 case SG_SCSI_RESET_HOST: 1046 val = SCSI_TRY_RESET_HOST; 1047 break; 1048 default: 1049 return -EINVAL; 1050 } 1051 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1052 return -EACCES; 1053 return (scsi_reset_provider(sdp->device, val) == 1054 SUCCESS) ? 0 : -EIO; 1055 case SCSI_IOCTL_SEND_COMMAND: 1056 if (sdp->detached) 1057 return -ENODEV; 1058 if (read_only) { 1059 unsigned char opcode = WRITE_6; 1060 Scsi_Ioctl_Command __user *siocp = p; 1061 1062 if (copy_from_user(&opcode, siocp->data, 1)) 1063 return -EFAULT; 1064 if (!blk_verify_command(filp, &opcode)) 1065 return -EPERM; 1066 } 1067 return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p); 1068 case SG_SET_DEBUG: 1069 result = get_user(val, ip); 1070 if (result) 1071 return result; 1072 sdp->sgdebug = (char) val; 1073 return 0; 1074 case SCSI_IOCTL_GET_IDLUN: 1075 case SCSI_IOCTL_GET_BUS_NUMBER: 1076 case SCSI_IOCTL_PROBE_HOST: 1077 case SG_GET_TRANSFORM: 1078 if (sdp->detached) 1079 return -ENODEV; 1080 return scsi_ioctl(sdp->device, cmd_in, p); 1081 case BLKSECTGET: 1082 return put_user(sdp->device->request_queue->max_sectors * 512, 1083 ip); 1084 case BLKTRACESETUP: 1085 return blk_trace_setup(sdp->device->request_queue, 1086 sdp->disk->disk_name, 1087 sdp->device->sdev_gendev.devt, 1088 (char *)arg); 1089 case BLKTRACESTART: 1090 return blk_trace_startstop(sdp->device->request_queue, 1); 1091 case BLKTRACESTOP: 1092 return blk_trace_startstop(sdp->device->request_queue, 0); 1093 case BLKTRACETEARDOWN: 1094 return blk_trace_remove(sdp->device->request_queue); 1095 default: 1096 if (read_only) 1097 return -EPERM; /* don't know so take safe approach */ 1098 return scsi_ioctl(sdp->device, cmd_in, p); 1099 } 1100 } 1101 1102 #ifdef CONFIG_COMPAT 1103 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1104 { 1105 Sg_device *sdp; 1106 Sg_fd *sfp; 1107 struct scsi_device *sdev; 1108 1109 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1110 return -ENXIO; 1111 1112 sdev = sdp->device; 1113 if (sdev->host->hostt->compat_ioctl) { 1114 int ret; 1115 1116 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1117 1118 return ret; 1119 } 1120 1121 return -ENOIOCTLCMD; 1122 } 1123 #endif 1124 1125 static unsigned int 1126 sg_poll(struct file *filp, poll_table * wait) 1127 { 1128 unsigned int res = 0; 1129 Sg_device *sdp; 1130 Sg_fd *sfp; 1131 Sg_request *srp; 1132 int count = 0; 1133 unsigned long iflags; 1134 1135 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) 1136 || sfp->closed) 1137 return POLLERR; 1138 poll_wait(filp, &sfp->read_wait, wait); 1139 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1140 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1141 /* if any read waiting, flag it */ 1142 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1143 res = POLLIN | POLLRDNORM; 1144 ++count; 1145 } 1146 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1147 1148 if (sdp->detached) 1149 res |= POLLHUP; 1150 else if (!sfp->cmd_q) { 1151 if (0 == count) 1152 res |= POLLOUT | POLLWRNORM; 1153 } else if (count < SG_MAX_QUEUE) 1154 res |= POLLOUT | POLLWRNORM; 1155 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1156 sdp->disk->disk_name, (int) res)); 1157 return res; 1158 } 1159 1160 static int 1161 sg_fasync(int fd, struct file *filp, int mode) 1162 { 1163 int retval; 1164 Sg_device *sdp; 1165 Sg_fd *sfp; 1166 1167 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1168 return -ENXIO; 1169 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1170 sdp->disk->disk_name, mode)); 1171 1172 retval = fasync_helper(fd, filp, mode, &sfp->async_qp); 1173 return (retval < 0) ? retval : 0; 1174 } 1175 1176 static int 1177 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1178 { 1179 Sg_fd *sfp; 1180 unsigned long offset, len, sa; 1181 Sg_scatter_hold *rsv_schp; 1182 struct scatterlist *sg; 1183 int k; 1184 1185 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1186 return VM_FAULT_SIGBUS; 1187 rsv_schp = &sfp->reserve; 1188 offset = vmf->pgoff << PAGE_SHIFT; 1189 if (offset >= rsv_schp->bufflen) 1190 return VM_FAULT_SIGBUS; 1191 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", 1192 offset, rsv_schp->k_use_sg)); 1193 sg = rsv_schp->buffer; 1194 sa = vma->vm_start; 1195 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1196 ++k, sg = sg_next(sg)) { 1197 len = vma->vm_end - sa; 1198 len = (len < sg->length) ? len : sg->length; 1199 if (offset < len) { 1200 struct page *page; 1201 page = virt_to_page(page_address(sg_page(sg)) + offset); 1202 get_page(page); /* increment page count */ 1203 vmf->page = page; 1204 return 0; /* success */ 1205 } 1206 sa += len; 1207 offset -= len; 1208 } 1209 1210 return VM_FAULT_SIGBUS; 1211 } 1212 1213 static struct vm_operations_struct sg_mmap_vm_ops = { 1214 .fault = sg_vma_fault, 1215 }; 1216 1217 static int 1218 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1219 { 1220 Sg_fd *sfp; 1221 unsigned long req_sz, len, sa; 1222 Sg_scatter_hold *rsv_schp; 1223 int k; 1224 struct scatterlist *sg; 1225 1226 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1227 return -ENXIO; 1228 req_sz = vma->vm_end - vma->vm_start; 1229 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1230 (void *) vma->vm_start, (int) req_sz)); 1231 if (vma->vm_pgoff) 1232 return -EINVAL; /* want no offset */ 1233 rsv_schp = &sfp->reserve; 1234 if (req_sz > rsv_schp->bufflen) 1235 return -ENOMEM; /* cannot map more than reserved buffer */ 1236 1237 sa = vma->vm_start; 1238 sg = rsv_schp->buffer; 1239 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1240 ++k, sg = sg_next(sg)) { 1241 len = vma->vm_end - sa; 1242 len = (len < sg->length) ? len : sg->length; 1243 sa += len; 1244 } 1245 1246 sfp->mmap_called = 1; 1247 vma->vm_flags |= VM_RESERVED; 1248 vma->vm_private_data = sfp; 1249 vma->vm_ops = &sg_mmap_vm_ops; 1250 return 0; 1251 } 1252 1253 /* This function is a "bottom half" handler that is called by the 1254 * mid level when a command is completed (or has failed). */ 1255 static void 1256 sg_cmd_done(void *data, char *sense, int result, int resid) 1257 { 1258 Sg_request *srp = data; 1259 Sg_device *sdp = NULL; 1260 Sg_fd *sfp; 1261 unsigned long iflags; 1262 unsigned int ms; 1263 1264 if (NULL == srp) { 1265 printk(KERN_ERR "sg_cmd_done: NULL request\n"); 1266 return; 1267 } 1268 sfp = srp->parentfp; 1269 if (sfp) 1270 sdp = sfp->parentdp; 1271 if ((NULL == sdp) || sdp->detached) { 1272 printk(KERN_INFO "sg_cmd_done: device detached\n"); 1273 return; 1274 } 1275 1276 1277 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1278 sdp->disk->disk_name, srp->header.pack_id, result)); 1279 srp->header.resid = resid; 1280 ms = jiffies_to_msecs(jiffies); 1281 srp->header.duration = (ms > srp->header.duration) ? 1282 (ms - srp->header.duration) : 0; 1283 if (0 != result) { 1284 struct scsi_sense_hdr sshdr; 1285 1286 memcpy(srp->sense_b, sense, sizeof (srp->sense_b)); 1287 srp->header.status = 0xff & result; 1288 srp->header.masked_status = status_byte(result); 1289 srp->header.msg_status = msg_byte(result); 1290 srp->header.host_status = host_byte(result); 1291 srp->header.driver_status = driver_byte(result); 1292 if ((sdp->sgdebug > 0) && 1293 ((CHECK_CONDITION == srp->header.masked_status) || 1294 (COMMAND_TERMINATED == srp->header.masked_status))) 1295 __scsi_print_sense("sg_cmd_done", sense, 1296 SCSI_SENSE_BUFFERSIZE); 1297 1298 /* Following if statement is a patch supplied by Eric Youngdale */ 1299 if (driver_byte(result) != 0 1300 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1301 && !scsi_sense_is_deferred(&sshdr) 1302 && sshdr.sense_key == UNIT_ATTENTION 1303 && sdp->device->removable) { 1304 /* Detected possible disc change. Set the bit - this */ 1305 /* may be used if there are filesystems using this device */ 1306 sdp->device->changed = 1; 1307 } 1308 } 1309 /* Rely on write phase to clean out srp status values, so no "else" */ 1310 1311 if (sfp->closed) { /* whoops this fd already released, cleanup */ 1312 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); 1313 sg_finish_rem_req(srp); 1314 srp = NULL; 1315 if (NULL == sfp->headrp) { 1316 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n")); 1317 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ 1318 scsi_device_put(sdp->device); 1319 } 1320 sfp = NULL; 1321 } 1322 } else if (srp && srp->orphan) { 1323 if (sfp->keep_orphan) 1324 srp->sg_io_owned = 0; 1325 else { 1326 sg_finish_rem_req(srp); 1327 srp = NULL; 1328 } 1329 } 1330 if (sfp && srp) { 1331 /* Now wake up any sg_read() that is waiting for this packet. */ 1332 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1333 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1334 srp->done = 1; 1335 wake_up_interruptible(&sfp->read_wait); 1336 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1337 } 1338 } 1339 1340 static struct file_operations sg_fops = { 1341 .owner = THIS_MODULE, 1342 .read = sg_read, 1343 .write = sg_write, 1344 .poll = sg_poll, 1345 .ioctl = sg_ioctl, 1346 #ifdef CONFIG_COMPAT 1347 .compat_ioctl = sg_compat_ioctl, 1348 #endif 1349 .open = sg_open, 1350 .mmap = sg_mmap, 1351 .release = sg_release, 1352 .fasync = sg_fasync, 1353 }; 1354 1355 static struct class *sg_sysfs_class; 1356 1357 static int sg_sysfs_valid = 0; 1358 1359 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1360 { 1361 struct request_queue *q = scsidp->request_queue; 1362 Sg_device *sdp; 1363 unsigned long iflags; 1364 int error; 1365 u32 k; 1366 1367 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1368 if (!sdp) { 1369 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1370 return ERR_PTR(-ENOMEM); 1371 } 1372 error = -ENOMEM; 1373 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) { 1374 printk(KERN_WARNING "idr expansion Sg_device failure\n"); 1375 goto out; 1376 } 1377 1378 write_lock_irqsave(&sg_index_lock, iflags); 1379 error = idr_get_new(&sg_index_idr, sdp, &k); 1380 write_unlock_irqrestore(&sg_index_lock, iflags); 1381 1382 if (error) { 1383 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n", 1384 error); 1385 goto out; 1386 } 1387 1388 if (unlikely(k >= SG_MAX_DEVS)) 1389 goto overflow; 1390 1391 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1392 sprintf(disk->disk_name, "sg%d", k); 1393 disk->first_minor = k; 1394 sdp->disk = disk; 1395 sdp->device = scsidp; 1396 init_waitqueue_head(&sdp->o_excl_wait); 1397 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments); 1398 sdp->index = k; 1399 1400 error = 0; 1401 out: 1402 if (error) { 1403 kfree(sdp); 1404 return ERR_PTR(error); 1405 } 1406 return sdp; 1407 1408 overflow: 1409 sdev_printk(KERN_WARNING, scsidp, 1410 "Unable to attach sg device type=%d, minor " 1411 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); 1412 error = -ENODEV; 1413 goto out; 1414 } 1415 1416 static int 1417 sg_add(struct device *cl_dev, struct class_interface *cl_intf) 1418 { 1419 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1420 struct gendisk *disk; 1421 Sg_device *sdp = NULL; 1422 struct cdev * cdev = NULL; 1423 int error; 1424 unsigned long iflags; 1425 1426 disk = alloc_disk(1); 1427 if (!disk) { 1428 printk(KERN_WARNING "alloc_disk failed\n"); 1429 return -ENOMEM; 1430 } 1431 disk->major = SCSI_GENERIC_MAJOR; 1432 1433 error = -ENOMEM; 1434 cdev = cdev_alloc(); 1435 if (!cdev) { 1436 printk(KERN_WARNING "cdev_alloc failed\n"); 1437 goto out; 1438 } 1439 cdev->owner = THIS_MODULE; 1440 cdev->ops = &sg_fops; 1441 1442 sdp = sg_alloc(disk, scsidp); 1443 if (IS_ERR(sdp)) { 1444 printk(KERN_WARNING "sg_alloc failed\n"); 1445 error = PTR_ERR(sdp); 1446 goto out; 1447 } 1448 1449 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); 1450 if (error) 1451 goto cdev_add_err; 1452 1453 sdp->cdev = cdev; 1454 if (sg_sysfs_valid) { 1455 struct device *sg_class_member; 1456 1457 sg_class_member = device_create_drvdata(sg_sysfs_class, 1458 cl_dev->parent, 1459 MKDEV(SCSI_GENERIC_MAJOR, 1460 sdp->index), 1461 sdp, 1462 "%s", disk->disk_name); 1463 if (IS_ERR(sg_class_member)) { 1464 printk(KERN_ERR "sg_add: " 1465 "device_create failed\n"); 1466 error = PTR_ERR(sg_class_member); 1467 goto cdev_add_err; 1468 } 1469 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1470 &sg_class_member->kobj, "generic"); 1471 if (error) 1472 printk(KERN_ERR "sg_add: unable to make symlink " 1473 "'generic' back to sg%d\n", sdp->index); 1474 } else 1475 printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); 1476 1477 sdev_printk(KERN_NOTICE, scsidp, 1478 "Attached scsi generic sg%d type %d\n", sdp->index, 1479 scsidp->type); 1480 1481 dev_set_drvdata(cl_dev, sdp); 1482 1483 return 0; 1484 1485 cdev_add_err: 1486 write_lock_irqsave(&sg_index_lock, iflags); 1487 idr_remove(&sg_index_idr, sdp->index); 1488 write_unlock_irqrestore(&sg_index_lock, iflags); 1489 kfree(sdp); 1490 1491 out: 1492 put_disk(disk); 1493 if (cdev) 1494 cdev_del(cdev); 1495 return error; 1496 } 1497 1498 static void 1499 sg_remove(struct device *cl_dev, struct class_interface *cl_intf) 1500 { 1501 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1502 Sg_device *sdp = dev_get_drvdata(cl_dev); 1503 unsigned long iflags; 1504 Sg_fd *sfp; 1505 Sg_fd *tsfp; 1506 Sg_request *srp; 1507 Sg_request *tsrp; 1508 int delay; 1509 1510 if (!sdp) 1511 return; 1512 1513 delay = 0; 1514 write_lock_irqsave(&sg_index_lock, iflags); 1515 if (sdp->headfp) { 1516 sdp->detached = 1; 1517 for (sfp = sdp->headfp; sfp; sfp = tsfp) { 1518 tsfp = sfp->nextfp; 1519 for (srp = sfp->headrp; srp; srp = tsrp) { 1520 tsrp = srp->nextrp; 1521 if (sfp->closed || (0 == sg_srp_done(srp, sfp))) 1522 sg_finish_rem_req(srp); 1523 } 1524 if (sfp->closed) { 1525 scsi_device_put(sdp->device); 1526 __sg_remove_sfp(sdp, sfp); 1527 } else { 1528 delay = 1; 1529 wake_up_interruptible(&sfp->read_wait); 1530 kill_fasync(&sfp->async_qp, SIGPOLL, 1531 POLL_HUP); 1532 } 1533 } 1534 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index)); 1535 if (NULL == sdp->headfp) { 1536 idr_remove(&sg_index_idr, sdp->index); 1537 } 1538 } else { /* nothing active, simple case */ 1539 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index)); 1540 idr_remove(&sg_index_idr, sdp->index); 1541 } 1542 write_unlock_irqrestore(&sg_index_lock, iflags); 1543 1544 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1545 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); 1546 cdev_del(sdp->cdev); 1547 sdp->cdev = NULL; 1548 put_disk(sdp->disk); 1549 sdp->disk = NULL; 1550 if (NULL == sdp->headfp) 1551 kfree(sdp); 1552 1553 if (delay) 1554 msleep(10); /* dirty detach so delay device destruction */ 1555 } 1556 1557 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1558 module_param_named(def_reserved_size, def_reserved_size, int, 1559 S_IRUGO | S_IWUSR); 1560 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1561 1562 MODULE_AUTHOR("Douglas Gilbert"); 1563 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1564 MODULE_LICENSE("GPL"); 1565 MODULE_VERSION(SG_VERSION_STR); 1566 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1567 1568 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1569 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1570 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1571 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1572 1573 static int __init 1574 init_sg(void) 1575 { 1576 int rc; 1577 1578 if (scatter_elem_sz < PAGE_SIZE) { 1579 scatter_elem_sz = PAGE_SIZE; 1580 scatter_elem_sz_prev = scatter_elem_sz; 1581 } 1582 if (def_reserved_size >= 0) 1583 sg_big_buff = def_reserved_size; 1584 else 1585 def_reserved_size = sg_big_buff; 1586 1587 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1588 SG_MAX_DEVS, "sg"); 1589 if (rc) 1590 return rc; 1591 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1592 if ( IS_ERR(sg_sysfs_class) ) { 1593 rc = PTR_ERR(sg_sysfs_class); 1594 goto err_out; 1595 } 1596 sg_sysfs_valid = 1; 1597 rc = scsi_register_interface(&sg_interface); 1598 if (0 == rc) { 1599 #ifdef CONFIG_SCSI_PROC_FS 1600 sg_proc_init(); 1601 #endif /* CONFIG_SCSI_PROC_FS */ 1602 return 0; 1603 } 1604 class_destroy(sg_sysfs_class); 1605 err_out: 1606 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1607 return rc; 1608 } 1609 1610 static void __exit 1611 exit_sg(void) 1612 { 1613 #ifdef CONFIG_SCSI_PROC_FS 1614 sg_proc_cleanup(); 1615 #endif /* CONFIG_SCSI_PROC_FS */ 1616 scsi_unregister_interface(&sg_interface); 1617 class_destroy(sg_sysfs_class); 1618 sg_sysfs_valid = 0; 1619 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1620 SG_MAX_DEVS); 1621 idr_destroy(&sg_index_idr); 1622 } 1623 1624 static int 1625 sg_start_req(Sg_request * srp) 1626 { 1627 int res; 1628 Sg_fd *sfp = srp->parentfp; 1629 sg_io_hdr_t *hp = &srp->header; 1630 int dxfer_len = (int) hp->dxfer_len; 1631 int dxfer_dir = hp->dxfer_direction; 1632 Sg_scatter_hold *req_schp = &srp->data; 1633 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1634 1635 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); 1636 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1637 return 0; 1638 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && 1639 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && 1640 (!sfp->parentdp->device->host->unchecked_isa_dma)) { 1641 res = sg_build_direct(srp, sfp, dxfer_len); 1642 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ 1643 return res; 1644 } 1645 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) 1646 sg_link_reserve(sfp, srp, dxfer_len); 1647 else { 1648 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1649 if (res) { 1650 sg_remove_scat(req_schp); 1651 return res; 1652 } 1653 } 1654 return 0; 1655 } 1656 1657 static void 1658 sg_finish_rem_req(Sg_request * srp) 1659 { 1660 Sg_fd *sfp = srp->parentfp; 1661 Sg_scatter_hold *req_schp = &srp->data; 1662 1663 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1664 if (srp->res_used) 1665 sg_unlink_reserve(sfp, srp); 1666 else 1667 sg_remove_scat(req_schp); 1668 sg_remove_request(sfp, srp); 1669 } 1670 1671 static int 1672 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1673 { 1674 int sg_bufflen = tablesize * sizeof(struct scatterlist); 1675 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1676 1677 /* 1678 * TODO: test without low_dma, we should not need it since 1679 * the block layer will bounce the buffer for us 1680 * 1681 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list. 1682 */ 1683 if (sfp->low_dma) 1684 gfp_flags |= GFP_DMA; 1685 schp->buffer = kzalloc(sg_bufflen, gfp_flags); 1686 if (!schp->buffer) 1687 return -ENOMEM; 1688 sg_init_table(schp->buffer, tablesize); 1689 schp->sglist_len = sg_bufflen; 1690 return tablesize; /* number of scat_gath elements allocated */ 1691 } 1692 1693 #ifdef SG_ALLOW_DIO_CODE 1694 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ 1695 /* TODO: hopefully we can use the generic block layer code */ 1696 1697 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if 1698 - mapping of all pages not successful 1699 (i.e., either completely successful or fails) 1700 */ 1701 static int 1702 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, 1703 unsigned long uaddr, size_t count, int rw) 1704 { 1705 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 1706 unsigned long start = uaddr >> PAGE_SHIFT; 1707 const int nr_pages = end - start; 1708 int res, i, j; 1709 struct page **pages; 1710 1711 /* User attempted Overflow! */ 1712 if ((uaddr + count) < uaddr) 1713 return -EINVAL; 1714 1715 /* Too big */ 1716 if (nr_pages > max_pages) 1717 return -ENOMEM; 1718 1719 /* Hmm? */ 1720 if (count == 0) 1721 return 0; 1722 1723 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) 1724 return -ENOMEM; 1725 1726 /* Try to fault in all of the necessary pages */ 1727 down_read(¤t->mm->mmap_sem); 1728 /* rw==READ means read from drive, write into memory area */ 1729 res = get_user_pages( 1730 current, 1731 current->mm, 1732 uaddr, 1733 nr_pages, 1734 rw == READ, 1735 0, /* don't force */ 1736 pages, 1737 NULL); 1738 up_read(¤t->mm->mmap_sem); 1739 1740 /* Errors and no page mapped should return here */ 1741 if (res < nr_pages) 1742 goto out_unmap; 1743 1744 for (i=0; i < nr_pages; i++) { 1745 /* FIXME: flush superflous for rw==READ, 1746 * probably wrong function for rw==WRITE 1747 */ 1748 flush_dcache_page(pages[i]); 1749 /* ?? Is locking needed? I don't think so */ 1750 /* if (TestSetPageLocked(pages[i])) 1751 goto out_unlock; */ 1752 } 1753 1754 sg_set_page(sgl, pages[0], 0, uaddr & ~PAGE_MASK); 1755 if (nr_pages > 1) { 1756 sgl[0].length = PAGE_SIZE - sgl[0].offset; 1757 count -= sgl[0].length; 1758 for (i=1; i < nr_pages ; i++) 1759 sg_set_page(&sgl[i], pages[i], count < PAGE_SIZE ? count : PAGE_SIZE, 0); 1760 } 1761 else { 1762 sgl[0].length = count; 1763 } 1764 1765 kfree(pages); 1766 return nr_pages; 1767 1768 out_unmap: 1769 if (res > 0) { 1770 for (j=0; j < res; j++) 1771 page_cache_release(pages[j]); 1772 res = 0; 1773 } 1774 kfree(pages); 1775 return res; 1776 } 1777 1778 1779 /* And unmap them... */ 1780 static int 1781 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, 1782 int dirtied) 1783 { 1784 int i; 1785 1786 for (i=0; i < nr_pages; i++) { 1787 struct page *page = sg_page(&sgl[i]); 1788 1789 if (dirtied) 1790 SetPageDirty(page); 1791 /* unlock_page(page); */ 1792 /* FIXME: cache flush missing for rw==READ 1793 * FIXME: call the correct reference counting function 1794 */ 1795 page_cache_release(page); 1796 } 1797 1798 return 0; 1799 } 1800 1801 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ 1802 #endif 1803 1804 1805 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ 1806 static int 1807 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) 1808 { 1809 #ifdef SG_ALLOW_DIO_CODE 1810 sg_io_hdr_t *hp = &srp->header; 1811 Sg_scatter_hold *schp = &srp->data; 1812 int sg_tablesize = sfp->parentdp->sg_tablesize; 1813 int mx_sc_elems, res; 1814 struct scsi_device *sdev = sfp->parentdp->device; 1815 1816 if (((unsigned long)hp->dxferp & 1817 queue_dma_alignment(sdev->request_queue)) != 0) 1818 return 1; 1819 1820 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1821 if (mx_sc_elems <= 0) { 1822 return 1; 1823 } 1824 res = st_map_user_pages(schp->buffer, mx_sc_elems, 1825 (unsigned long)hp->dxferp, dxfer_len, 1826 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0); 1827 if (res <= 0) { 1828 sg_remove_scat(schp); 1829 return 1; 1830 } 1831 schp->k_use_sg = res; 1832 schp->dio_in_use = 1; 1833 hp->info |= SG_INFO_DIRECT_IO; 1834 return 0; 1835 #else 1836 return 1; 1837 #endif 1838 } 1839 1840 static int 1841 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1842 { 1843 struct scatterlist *sg; 1844 int ret_sz = 0, k, rem_sz, num, mx_sc_elems; 1845 int sg_tablesize = sfp->parentdp->sg_tablesize; 1846 int blk_size = buff_size; 1847 struct page *p = NULL; 1848 1849 if (blk_size < 0) 1850 return -EFAULT; 1851 if (0 == blk_size) 1852 ++blk_size; /* don't know why */ 1853 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1854 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); 1855 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1856 buff_size, blk_size)); 1857 1858 /* N.B. ret_sz carried into this block ... */ 1859 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1860 if (mx_sc_elems < 0) 1861 return mx_sc_elems; /* most likely -ENOMEM */ 1862 1863 num = scatter_elem_sz; 1864 if (unlikely(num != scatter_elem_sz_prev)) { 1865 if (num < PAGE_SIZE) { 1866 scatter_elem_sz = PAGE_SIZE; 1867 scatter_elem_sz_prev = PAGE_SIZE; 1868 } else 1869 scatter_elem_sz_prev = num; 1870 } 1871 for (k = 0, sg = schp->buffer, rem_sz = blk_size; 1872 (rem_sz > 0) && (k < mx_sc_elems); 1873 ++k, rem_sz -= ret_sz, sg = sg_next(sg)) { 1874 1875 num = (rem_sz > scatter_elem_sz_prev) ? 1876 scatter_elem_sz_prev : rem_sz; 1877 p = sg_page_malloc(num, sfp->low_dma, &ret_sz); 1878 if (!p) 1879 return -ENOMEM; 1880 1881 if (num == scatter_elem_sz_prev) { 1882 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1883 scatter_elem_sz = ret_sz; 1884 scatter_elem_sz_prev = ret_sz; 1885 } 1886 } 1887 sg_set_page(sg, p, (ret_sz > num) ? num : ret_sz, 0); 1888 1889 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " 1890 "ret_sz=%d\n", k, num, ret_sz)); 1891 } /* end of for loop */ 1892 1893 schp->k_use_sg = k; 1894 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " 1895 "rem_sz=%d\n", k, rem_sz)); 1896 1897 schp->bufflen = blk_size; 1898 if (rem_sz > 0) /* must have failed */ 1899 return -ENOMEM; 1900 1901 return 0; 1902 } 1903 1904 static int 1905 sg_write_xfer(Sg_request * srp) 1906 { 1907 sg_io_hdr_t *hp = &srp->header; 1908 Sg_scatter_hold *schp = &srp->data; 1909 struct scatterlist *sg = schp->buffer; 1910 int num_xfer = 0; 1911 int j, k, onum, usglen, ksglen, res; 1912 int iovec_count = (int) hp->iovec_count; 1913 int dxfer_dir = hp->dxfer_direction; 1914 unsigned char *p; 1915 unsigned char __user *up; 1916 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 1917 1918 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || 1919 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 1920 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); 1921 if (schp->bufflen < num_xfer) 1922 num_xfer = schp->bufflen; 1923 } 1924 if ((num_xfer <= 0) || (schp->dio_in_use) || 1925 (new_interface 1926 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 1927 return 0; 1928 1929 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 1930 num_xfer, iovec_count, schp->k_use_sg)); 1931 if (iovec_count) { 1932 onum = iovec_count; 1933 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 1934 return -EFAULT; 1935 } else 1936 onum = 1; 1937 1938 ksglen = sg->length; 1939 p = page_address(sg_page(sg)); 1940 for (j = 0, k = 0; j < onum; ++j) { 1941 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); 1942 if (res) 1943 return res; 1944 1945 for (; p; sg = sg_next(sg), ksglen = sg->length, 1946 p = page_address(sg_page(sg))) { 1947 if (usglen <= 0) 1948 break; 1949 if (ksglen > usglen) { 1950 if (usglen >= num_xfer) { 1951 if (__copy_from_user(p, up, num_xfer)) 1952 return -EFAULT; 1953 return 0; 1954 } 1955 if (__copy_from_user(p, up, usglen)) 1956 return -EFAULT; 1957 p += usglen; 1958 ksglen -= usglen; 1959 break; 1960 } else { 1961 if (ksglen >= num_xfer) { 1962 if (__copy_from_user(p, up, num_xfer)) 1963 return -EFAULT; 1964 return 0; 1965 } 1966 if (__copy_from_user(p, up, ksglen)) 1967 return -EFAULT; 1968 up += ksglen; 1969 usglen -= ksglen; 1970 } 1971 ++k; 1972 if (k >= schp->k_use_sg) 1973 return 0; 1974 } 1975 } 1976 1977 return 0; 1978 } 1979 1980 static int 1981 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 1982 int wr_xf, int *countp, unsigned char __user **up) 1983 { 1984 int num_xfer = (int) hp->dxfer_len; 1985 unsigned char __user *p = hp->dxferp; 1986 int count; 1987 1988 if (0 == sg_num) { 1989 if (wr_xf && ('\0' == hp->interface_id)) 1990 count = (int) hp->flags; /* holds "old" input_size */ 1991 else 1992 count = num_xfer; 1993 } else { 1994 sg_iovec_t iovec; 1995 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) 1996 return -EFAULT; 1997 p = iovec.iov_base; 1998 count = (int) iovec.iov_len; 1999 } 2000 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) 2001 return -EFAULT; 2002 if (up) 2003 *up = p; 2004 if (countp) 2005 *countp = count; 2006 return 0; 2007 } 2008 2009 static void 2010 sg_remove_scat(Sg_scatter_hold * schp) 2011 { 2012 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 2013 if (schp->buffer && (schp->sglist_len > 0)) { 2014 struct scatterlist *sg = schp->buffer; 2015 2016 if (schp->dio_in_use) { 2017 #ifdef SG_ALLOW_DIO_CODE 2018 st_unmap_user_pages(sg, schp->k_use_sg, TRUE); 2019 #endif 2020 } else { 2021 int k; 2022 2023 for (k = 0; (k < schp->k_use_sg) && sg_page(sg); 2024 ++k, sg = sg_next(sg)) { 2025 SCSI_LOG_TIMEOUT(5, printk( 2026 "sg_remove_scat: k=%d, pg=0x%p, len=%d\n", 2027 k, sg_page(sg), sg->length)); 2028 sg_page_free(sg_page(sg), sg->length); 2029 } 2030 } 2031 kfree(schp->buffer); 2032 } 2033 memset(schp, 0, sizeof (*schp)); 2034 } 2035 2036 static int 2037 sg_read_xfer(Sg_request * srp) 2038 { 2039 sg_io_hdr_t *hp = &srp->header; 2040 Sg_scatter_hold *schp = &srp->data; 2041 struct scatterlist *sg = schp->buffer; 2042 int num_xfer = 0; 2043 int j, k, onum, usglen, ksglen, res; 2044 int iovec_count = (int) hp->iovec_count; 2045 int dxfer_dir = hp->dxfer_direction; 2046 unsigned char *p; 2047 unsigned char __user *up; 2048 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 2049 2050 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) 2051 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 2052 num_xfer = hp->dxfer_len; 2053 if (schp->bufflen < num_xfer) 2054 num_xfer = schp->bufflen; 2055 } 2056 if ((num_xfer <= 0) || (schp->dio_in_use) || 2057 (new_interface 2058 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 2059 return 0; 2060 2061 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 2062 num_xfer, iovec_count, schp->k_use_sg)); 2063 if (iovec_count) { 2064 onum = iovec_count; 2065 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 2066 return -EFAULT; 2067 } else 2068 onum = 1; 2069 2070 p = page_address(sg_page(sg)); 2071 ksglen = sg->length; 2072 for (j = 0, k = 0; j < onum; ++j) { 2073 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); 2074 if (res) 2075 return res; 2076 2077 for (; p; sg = sg_next(sg), ksglen = sg->length, 2078 p = page_address(sg_page(sg))) { 2079 if (usglen <= 0) 2080 break; 2081 if (ksglen > usglen) { 2082 if (usglen >= num_xfer) { 2083 if (__copy_to_user(up, p, num_xfer)) 2084 return -EFAULT; 2085 return 0; 2086 } 2087 if (__copy_to_user(up, p, usglen)) 2088 return -EFAULT; 2089 p += usglen; 2090 ksglen -= usglen; 2091 break; 2092 } else { 2093 if (ksglen >= num_xfer) { 2094 if (__copy_to_user(up, p, num_xfer)) 2095 return -EFAULT; 2096 return 0; 2097 } 2098 if (__copy_to_user(up, p, ksglen)) 2099 return -EFAULT; 2100 up += ksglen; 2101 usglen -= ksglen; 2102 } 2103 ++k; 2104 if (k >= schp->k_use_sg) 2105 return 0; 2106 } 2107 } 2108 2109 return 0; 2110 } 2111 2112 static int 2113 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 2114 { 2115 Sg_scatter_hold *schp = &srp->data; 2116 struct scatterlist *sg = schp->buffer; 2117 int k, num; 2118 2119 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 2120 num_read_xfer)); 2121 if ((!outp) || (num_read_xfer <= 0)) 2122 return 0; 2123 2124 for (k = 0; (k < schp->k_use_sg) && sg_page(sg); ++k, sg = sg_next(sg)) { 2125 num = sg->length; 2126 if (num > num_read_xfer) { 2127 if (__copy_to_user(outp, page_address(sg_page(sg)), 2128 num_read_xfer)) 2129 return -EFAULT; 2130 break; 2131 } else { 2132 if (__copy_to_user(outp, page_address(sg_page(sg)), 2133 num)) 2134 return -EFAULT; 2135 num_read_xfer -= num; 2136 if (num_read_xfer <= 0) 2137 break; 2138 outp += num; 2139 } 2140 } 2141 2142 return 0; 2143 } 2144 2145 static void 2146 sg_build_reserve(Sg_fd * sfp, int req_size) 2147 { 2148 Sg_scatter_hold *schp = &sfp->reserve; 2149 2150 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 2151 do { 2152 if (req_size < PAGE_SIZE) 2153 req_size = PAGE_SIZE; 2154 if (0 == sg_build_indirect(schp, sfp, req_size)) 2155 return; 2156 else 2157 sg_remove_scat(schp); 2158 req_size >>= 1; /* divide by 2 */ 2159 } while (req_size > (PAGE_SIZE / 2)); 2160 } 2161 2162 static void 2163 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 2164 { 2165 Sg_scatter_hold *req_schp = &srp->data; 2166 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2167 struct scatterlist *sg = rsv_schp->buffer; 2168 int k, num, rem; 2169 2170 srp->res_used = 1; 2171 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 2172 rem = size; 2173 2174 for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) { 2175 num = sg->length; 2176 if (rem <= num) { 2177 sfp->save_scat_len = num; 2178 sg->length = rem; 2179 req_schp->k_use_sg = k + 1; 2180 req_schp->sglist_len = rsv_schp->sglist_len; 2181 req_schp->buffer = rsv_schp->buffer; 2182 2183 req_schp->bufflen = size; 2184 req_schp->b_malloc_len = rsv_schp->b_malloc_len; 2185 break; 2186 } else 2187 rem -= num; 2188 } 2189 2190 if (k >= rsv_schp->k_use_sg) 2191 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 2192 } 2193 2194 static void 2195 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 2196 { 2197 Sg_scatter_hold *req_schp = &srp->data; 2198 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2199 2200 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 2201 (int) req_schp->k_use_sg)); 2202 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { 2203 struct scatterlist *sg = rsv_schp->buffer; 2204 2205 if (sfp->save_scat_len > 0) 2206 (sg + (req_schp->k_use_sg - 1))->length = 2207 (unsigned) sfp->save_scat_len; 2208 else 2209 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); 2210 } 2211 req_schp->k_use_sg = 0; 2212 req_schp->bufflen = 0; 2213 req_schp->buffer = NULL; 2214 req_schp->sglist_len = 0; 2215 sfp->save_scat_len = 0; 2216 srp->res_used = 0; 2217 } 2218 2219 static Sg_request * 2220 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 2221 { 2222 Sg_request *resp; 2223 unsigned long iflags; 2224 2225 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2226 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 2227 /* look for requests that are ready + not SG_IO owned */ 2228 if ((1 == resp->done) && (!resp->sg_io_owned) && 2229 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 2230 resp->done = 2; /* guard against other readers */ 2231 break; 2232 } 2233 } 2234 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2235 return resp; 2236 } 2237 2238 #ifdef CONFIG_SCSI_PROC_FS 2239 static Sg_request * 2240 sg_get_nth_request(Sg_fd * sfp, int nth) 2241 { 2242 Sg_request *resp; 2243 unsigned long iflags; 2244 int k; 2245 2246 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2247 for (k = 0, resp = sfp->headrp; resp && (k < nth); 2248 ++k, resp = resp->nextrp) ; 2249 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2250 return resp; 2251 } 2252 #endif 2253 2254 /* always adds to end of list */ 2255 static Sg_request * 2256 sg_add_request(Sg_fd * sfp) 2257 { 2258 int k; 2259 unsigned long iflags; 2260 Sg_request *resp; 2261 Sg_request *rp = sfp->req_arr; 2262 2263 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2264 resp = sfp->headrp; 2265 if (!resp) { 2266 memset(rp, 0, sizeof (Sg_request)); 2267 rp->parentfp = sfp; 2268 resp = rp; 2269 sfp->headrp = resp; 2270 } else { 2271 if (0 == sfp->cmd_q) 2272 resp = NULL; /* command queuing disallowed */ 2273 else { 2274 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2275 if (!rp->parentfp) 2276 break; 2277 } 2278 if (k < SG_MAX_QUEUE) { 2279 memset(rp, 0, sizeof (Sg_request)); 2280 rp->parentfp = sfp; 2281 while (resp->nextrp) 2282 resp = resp->nextrp; 2283 resp->nextrp = rp; 2284 resp = rp; 2285 } else 2286 resp = NULL; 2287 } 2288 } 2289 if (resp) { 2290 resp->nextrp = NULL; 2291 resp->header.duration = jiffies_to_msecs(jiffies); 2292 } 2293 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2294 return resp; 2295 } 2296 2297 /* Return of 1 for found; 0 for not found */ 2298 static int 2299 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2300 { 2301 Sg_request *prev_rp; 2302 Sg_request *rp; 2303 unsigned long iflags; 2304 int res = 0; 2305 2306 if ((!sfp) || (!srp) || (!sfp->headrp)) 2307 return res; 2308 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2309 prev_rp = sfp->headrp; 2310 if (srp == prev_rp) { 2311 sfp->headrp = prev_rp->nextrp; 2312 prev_rp->parentfp = NULL; 2313 res = 1; 2314 } else { 2315 while ((rp = prev_rp->nextrp)) { 2316 if (srp == rp) { 2317 prev_rp->nextrp = rp->nextrp; 2318 rp->parentfp = NULL; 2319 res = 1; 2320 break; 2321 } 2322 prev_rp = rp; 2323 } 2324 } 2325 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2326 return res; 2327 } 2328 2329 #ifdef CONFIG_SCSI_PROC_FS 2330 static Sg_fd * 2331 sg_get_nth_sfp(Sg_device * sdp, int nth) 2332 { 2333 Sg_fd *resp; 2334 unsigned long iflags; 2335 int k; 2336 2337 read_lock_irqsave(&sg_index_lock, iflags); 2338 for (k = 0, resp = sdp->headfp; resp && (k < nth); 2339 ++k, resp = resp->nextfp) ; 2340 read_unlock_irqrestore(&sg_index_lock, iflags); 2341 return resp; 2342 } 2343 #endif 2344 2345 static Sg_fd * 2346 sg_add_sfp(Sg_device * sdp, int dev) 2347 { 2348 Sg_fd *sfp; 2349 unsigned long iflags; 2350 int bufflen; 2351 2352 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2353 if (!sfp) 2354 return NULL; 2355 2356 init_waitqueue_head(&sfp->read_wait); 2357 rwlock_init(&sfp->rq_list_lock); 2358 2359 sfp->timeout = SG_DEFAULT_TIMEOUT; 2360 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2361 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2362 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2363 sdp->device->host->unchecked_isa_dma : 1; 2364 sfp->cmd_q = SG_DEF_COMMAND_Q; 2365 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2366 sfp->parentdp = sdp; 2367 write_lock_irqsave(&sg_index_lock, iflags); 2368 if (!sdp->headfp) 2369 sdp->headfp = sfp; 2370 else { /* add to tail of existing list */ 2371 Sg_fd *pfp = sdp->headfp; 2372 while (pfp->nextfp) 2373 pfp = pfp->nextfp; 2374 pfp->nextfp = sfp; 2375 } 2376 write_unlock_irqrestore(&sg_index_lock, iflags); 2377 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2378 if (unlikely(sg_big_buff != def_reserved_size)) 2379 sg_big_buff = def_reserved_size; 2380 2381 bufflen = min_t(int, sg_big_buff, 2382 sdp->device->request_queue->max_sectors * 512); 2383 sg_build_reserve(sfp, bufflen); 2384 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2385 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2386 return sfp; 2387 } 2388 2389 static void 2390 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2391 { 2392 Sg_fd *fp; 2393 Sg_fd *prev_fp; 2394 2395 prev_fp = sdp->headfp; 2396 if (sfp == prev_fp) 2397 sdp->headfp = prev_fp->nextfp; 2398 else { 2399 while ((fp = prev_fp->nextfp)) { 2400 if (sfp == fp) { 2401 prev_fp->nextfp = fp->nextfp; 2402 break; 2403 } 2404 prev_fp = fp; 2405 } 2406 } 2407 if (sfp->reserve.bufflen > 0) { 2408 SCSI_LOG_TIMEOUT(6, 2409 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2410 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); 2411 sg_remove_scat(&sfp->reserve); 2412 } 2413 sfp->parentdp = NULL; 2414 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); 2415 kfree(sfp); 2416 } 2417 2418 /* Returns 0 in normal case, 1 when detached and sdp object removed */ 2419 static int 2420 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2421 { 2422 Sg_request *srp; 2423 Sg_request *tsrp; 2424 int dirty = 0; 2425 int res = 0; 2426 2427 for (srp = sfp->headrp; srp; srp = tsrp) { 2428 tsrp = srp->nextrp; 2429 if (sg_srp_done(srp, sfp)) 2430 sg_finish_rem_req(srp); 2431 else 2432 ++dirty; 2433 } 2434 if (0 == dirty) { 2435 unsigned long iflags; 2436 2437 write_lock_irqsave(&sg_index_lock, iflags); 2438 __sg_remove_sfp(sdp, sfp); 2439 if (sdp->detached && (NULL == sdp->headfp)) { 2440 idr_remove(&sg_index_idr, sdp->index); 2441 kfree(sdp); 2442 res = 1; 2443 } 2444 write_unlock_irqrestore(&sg_index_lock, iflags); 2445 } else { 2446 /* MOD_INC's to inhibit unloading sg and associated adapter driver */ 2447 /* only bump the access_count if we actually succeeded in 2448 * throwing another counter on the host module */ 2449 scsi_device_get(sdp->device); /* XXX: retval ignored? */ 2450 sfp->closed = 1; /* flag dirty state on this fd */ 2451 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", 2452 dirty)); 2453 } 2454 return res; 2455 } 2456 2457 static int 2458 sg_res_in_use(Sg_fd * sfp) 2459 { 2460 const Sg_request *srp; 2461 unsigned long iflags; 2462 2463 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2464 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2465 if (srp->res_used) 2466 break; 2467 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2468 return srp ? 1 : 0; 2469 } 2470 2471 /* The size fetched (value output via retSzp) set when non-NULL return */ 2472 static struct page * 2473 sg_page_malloc(int rqSz, int lowDma, int *retSzp) 2474 { 2475 struct page *resp = NULL; 2476 gfp_t page_mask; 2477 int order, a_size; 2478 int resSz; 2479 2480 if ((rqSz <= 0) || (NULL == retSzp)) 2481 return resp; 2482 2483 if (lowDma) 2484 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN; 2485 else 2486 page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 2487 2488 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; 2489 order++, a_size <<= 1) ; 2490 resSz = a_size; /* rounded up if necessary */ 2491 resp = alloc_pages(page_mask, order); 2492 while ((!resp) && order) { 2493 --order; 2494 a_size >>= 1; /* divide by 2, until PAGE_SIZE */ 2495 resp = alloc_pages(page_mask, order); /* try half */ 2496 resSz = a_size; 2497 } 2498 if (resp) { 2499 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2500 memset(page_address(resp), 0, resSz); 2501 *retSzp = resSz; 2502 } 2503 return resp; 2504 } 2505 2506 static void 2507 sg_page_free(struct page *page, int size) 2508 { 2509 int order, a_size; 2510 2511 if (!page) 2512 return; 2513 for (order = 0, a_size = PAGE_SIZE; a_size < size; 2514 order++, a_size <<= 1) ; 2515 __free_pages(page, order); 2516 } 2517 2518 #ifdef CONFIG_SCSI_PROC_FS 2519 static int 2520 sg_idr_max_id(int id, void *p, void *data) 2521 { 2522 int *k = data; 2523 2524 if (*k < id) 2525 *k = id; 2526 2527 return 0; 2528 } 2529 2530 static int 2531 sg_last_dev(void) 2532 { 2533 int k = -1; 2534 unsigned long iflags; 2535 2536 read_lock_irqsave(&sg_index_lock, iflags); 2537 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2538 read_unlock_irqrestore(&sg_index_lock, iflags); 2539 return k + 1; /* origin 1 */ 2540 } 2541 #endif 2542 2543 static Sg_device * 2544 sg_get_dev(int dev) 2545 { 2546 Sg_device *sdp; 2547 unsigned long iflags; 2548 2549 read_lock_irqsave(&sg_index_lock, iflags); 2550 sdp = idr_find(&sg_index_idr, dev); 2551 read_unlock_irqrestore(&sg_index_lock, iflags); 2552 2553 return sdp; 2554 } 2555 2556 #ifdef CONFIG_SCSI_PROC_FS 2557 2558 static struct proc_dir_entry *sg_proc_sgp = NULL; 2559 2560 static char sg_proc_sg_dirname[] = "scsi/sg"; 2561 2562 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2563 2564 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2565 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2566 size_t count, loff_t *off); 2567 static struct file_operations adio_fops = { 2568 /* .owner, .read and .llseek added in sg_proc_init() */ 2569 .open = sg_proc_single_open_adio, 2570 .write = sg_proc_write_adio, 2571 .release = single_release, 2572 }; 2573 2574 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2575 static ssize_t sg_proc_write_dressz(struct file *filp, 2576 const char __user *buffer, size_t count, loff_t *off); 2577 static struct file_operations dressz_fops = { 2578 .open = sg_proc_single_open_dressz, 2579 .write = sg_proc_write_dressz, 2580 .release = single_release, 2581 }; 2582 2583 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2584 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2585 static struct file_operations version_fops = { 2586 .open = sg_proc_single_open_version, 2587 .release = single_release, 2588 }; 2589 2590 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2591 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2592 static struct file_operations devhdr_fops = { 2593 .open = sg_proc_single_open_devhdr, 2594 .release = single_release, 2595 }; 2596 2597 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2598 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2599 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2600 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2601 static void dev_seq_stop(struct seq_file *s, void *v); 2602 static struct file_operations dev_fops = { 2603 .open = sg_proc_open_dev, 2604 .release = seq_release, 2605 }; 2606 static struct seq_operations dev_seq_ops = { 2607 .start = dev_seq_start, 2608 .next = dev_seq_next, 2609 .stop = dev_seq_stop, 2610 .show = sg_proc_seq_show_dev, 2611 }; 2612 2613 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2614 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2615 static struct file_operations devstrs_fops = { 2616 .open = sg_proc_open_devstrs, 2617 .release = seq_release, 2618 }; 2619 static struct seq_operations devstrs_seq_ops = { 2620 .start = dev_seq_start, 2621 .next = dev_seq_next, 2622 .stop = dev_seq_stop, 2623 .show = sg_proc_seq_show_devstrs, 2624 }; 2625 2626 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2627 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2628 static struct file_operations debug_fops = { 2629 .open = sg_proc_open_debug, 2630 .release = seq_release, 2631 }; 2632 static struct seq_operations debug_seq_ops = { 2633 .start = dev_seq_start, 2634 .next = dev_seq_next, 2635 .stop = dev_seq_stop, 2636 .show = sg_proc_seq_show_debug, 2637 }; 2638 2639 2640 struct sg_proc_leaf { 2641 const char * name; 2642 struct file_operations * fops; 2643 }; 2644 2645 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2646 {"allow_dio", &adio_fops}, 2647 {"debug", &debug_fops}, 2648 {"def_reserved_size", &dressz_fops}, 2649 {"device_hdr", &devhdr_fops}, 2650 {"devices", &dev_fops}, 2651 {"device_strs", &devstrs_fops}, 2652 {"version", &version_fops} 2653 }; 2654 2655 static int 2656 sg_proc_init(void) 2657 { 2658 int k, mask; 2659 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2660 struct sg_proc_leaf * leaf; 2661 2662 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2663 if (!sg_proc_sgp) 2664 return 1; 2665 for (k = 0; k < num_leaves; ++k) { 2666 leaf = &sg_proc_leaf_arr[k]; 2667 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2668 leaf->fops->owner = THIS_MODULE; 2669 leaf->fops->read = seq_read; 2670 leaf->fops->llseek = seq_lseek; 2671 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); 2672 } 2673 return 0; 2674 } 2675 2676 static void 2677 sg_proc_cleanup(void) 2678 { 2679 int k; 2680 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2681 2682 if (!sg_proc_sgp) 2683 return; 2684 for (k = 0; k < num_leaves; ++k) 2685 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2686 remove_proc_entry(sg_proc_sg_dirname, NULL); 2687 } 2688 2689 2690 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2691 { 2692 seq_printf(s, "%d\n", *((int *)s->private)); 2693 return 0; 2694 } 2695 2696 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2697 { 2698 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2699 } 2700 2701 static ssize_t 2702 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2703 size_t count, loff_t *off) 2704 { 2705 int num; 2706 char buff[11]; 2707 2708 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2709 return -EACCES; 2710 num = (count < 10) ? count : 10; 2711 if (copy_from_user(buff, buffer, num)) 2712 return -EFAULT; 2713 buff[num] = '\0'; 2714 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2715 return count; 2716 } 2717 2718 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2719 { 2720 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2721 } 2722 2723 static ssize_t 2724 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2725 size_t count, loff_t *off) 2726 { 2727 int num; 2728 unsigned long k = ULONG_MAX; 2729 char buff[11]; 2730 2731 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2732 return -EACCES; 2733 num = (count < 10) ? count : 10; 2734 if (copy_from_user(buff, buffer, num)) 2735 return -EFAULT; 2736 buff[num] = '\0'; 2737 k = simple_strtoul(buff, NULL, 10); 2738 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2739 sg_big_buff = k; 2740 return count; 2741 } 2742 return -ERANGE; 2743 } 2744 2745 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2746 { 2747 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2748 sg_version_date); 2749 return 0; 2750 } 2751 2752 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2753 { 2754 return single_open(file, sg_proc_seq_show_version, NULL); 2755 } 2756 2757 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2758 { 2759 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2760 "online\n"); 2761 return 0; 2762 } 2763 2764 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2765 { 2766 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2767 } 2768 2769 struct sg_proc_deviter { 2770 loff_t index; 2771 size_t max; 2772 }; 2773 2774 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2775 { 2776 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2777 2778 s->private = it; 2779 if (! it) 2780 return NULL; 2781 2782 it->index = *pos; 2783 it->max = sg_last_dev(); 2784 if (it->index >= it->max) 2785 return NULL; 2786 return it; 2787 } 2788 2789 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2790 { 2791 struct sg_proc_deviter * it = s->private; 2792 2793 *pos = ++it->index; 2794 return (it->index < it->max) ? it : NULL; 2795 } 2796 2797 static void dev_seq_stop(struct seq_file *s, void *v) 2798 { 2799 kfree(s->private); 2800 } 2801 2802 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2803 { 2804 return seq_open(file, &dev_seq_ops); 2805 } 2806 2807 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2808 { 2809 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2810 Sg_device *sdp; 2811 struct scsi_device *scsidp; 2812 2813 sdp = it ? sg_get_dev(it->index) : NULL; 2814 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2815 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2816 scsidp->host->host_no, scsidp->channel, 2817 scsidp->id, scsidp->lun, (int) scsidp->type, 2818 1, 2819 (int) scsidp->queue_depth, 2820 (int) scsidp->device_busy, 2821 (int) scsi_device_online(scsidp)); 2822 else 2823 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2824 return 0; 2825 } 2826 2827 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2828 { 2829 return seq_open(file, &devstrs_seq_ops); 2830 } 2831 2832 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2833 { 2834 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2835 Sg_device *sdp; 2836 struct scsi_device *scsidp; 2837 2838 sdp = it ? sg_get_dev(it->index) : NULL; 2839 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2840 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2841 scsidp->vendor, scsidp->model, scsidp->rev); 2842 else 2843 seq_printf(s, "<no active device>\n"); 2844 return 0; 2845 } 2846 2847 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2848 { 2849 int k, m, new_interface, blen, usg; 2850 Sg_request *srp; 2851 Sg_fd *fp; 2852 const sg_io_hdr_t *hp; 2853 const char * cp; 2854 unsigned int ms; 2855 2856 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { 2857 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2858 "(res)sgat=%d low_dma=%d\n", k + 1, 2859 jiffies_to_msecs(fp->timeout), 2860 fp->reserve.bufflen, 2861 (int) fp->reserve.k_use_sg, 2862 (int) fp->low_dma); 2863 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2864 (int) fp->cmd_q, (int) fp->force_packid, 2865 (int) fp->keep_orphan, (int) fp->closed); 2866 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { 2867 hp = &srp->header; 2868 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2869 if (srp->res_used) { 2870 if (new_interface && 2871 (SG_FLAG_MMAP_IO & hp->flags)) 2872 cp = " mmap>> "; 2873 else 2874 cp = " rb>> "; 2875 } else { 2876 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2877 cp = " dio>> "; 2878 else 2879 cp = " "; 2880 } 2881 seq_printf(s, cp); 2882 blen = srp->data.bufflen; 2883 usg = srp->data.k_use_sg; 2884 seq_printf(s, srp->done ? 2885 ((1 == srp->done) ? "rcv:" : "fin:") 2886 : "act:"); 2887 seq_printf(s, " id=%d blen=%d", 2888 srp->header.pack_id, blen); 2889 if (srp->done) 2890 seq_printf(s, " dur=%d", hp->duration); 2891 else { 2892 ms = jiffies_to_msecs(jiffies); 2893 seq_printf(s, " t_o/elap=%d/%d", 2894 (new_interface ? hp->timeout : 2895 jiffies_to_msecs(fp->timeout)), 2896 (ms > hp->duration ? ms - hp->duration : 0)); 2897 } 2898 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2899 (int) srp->data.cmd_opcode); 2900 } 2901 if (0 == m) 2902 seq_printf(s, " No requests active\n"); 2903 } 2904 } 2905 2906 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2907 { 2908 return seq_open(file, &debug_seq_ops); 2909 } 2910 2911 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2912 { 2913 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2914 Sg_device *sdp; 2915 2916 if (it && (0 == it->index)) { 2917 seq_printf(s, "max_active_device=%d(origin 1)\n", 2918 (int)it->max); 2919 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2920 } 2921 sdp = it ? sg_get_dev(it->index) : NULL; 2922 if (sdp) { 2923 struct scsi_device *scsidp = sdp->device; 2924 2925 if (NULL == scsidp) { 2926 seq_printf(s, "device %d detached ??\n", 2927 (int)it->index); 2928 return 0; 2929 } 2930 2931 if (sg_get_nth_sfp(sdp, 0)) { 2932 seq_printf(s, " >>> device=%s ", 2933 sdp->disk->disk_name); 2934 if (sdp->detached) 2935 seq_printf(s, "detached pending close "); 2936 else 2937 seq_printf 2938 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2939 scsidp->host->host_no, 2940 scsidp->channel, scsidp->id, 2941 scsidp->lun, 2942 scsidp->host->hostt->emulated); 2943 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2944 sdp->sg_tablesize, sdp->exclude); 2945 } 2946 sg_proc_debug_helper(s, sdp); 2947 } 2948 return 0; 2949 } 2950 2951 #endif /* CONFIG_SCSI_PROC_FS */ 2952 2953 module_init(init_sg); 2954 module_exit(exit_sg); 2955