1 /* 2 * History: 3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), 4 * to allow user process control of SCSI devices. 5 * Development Sponsored by Killy Corp. NY NY 6 * 7 * Original driver (sg.c): 8 * Copyright (C) 1992 Lawrence Foard 9 * Version 2 and 3 extensions to driver: 10 * Copyright (C) 1998 - 2005 Douglas Gilbert 11 * 12 * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 */ 20 21 static int sg_version_num = 30533; /* 2 digits for each component */ 22 #define SG_VERSION_STR "3.5.33" 23 24 /* 25 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes: 26 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First 27 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING 28 * (otherwise the macros compile to empty statements). 29 * 30 */ 31 #include <linux/config.h> 32 #include <linux/module.h> 33 34 #include <linux/fs.h> 35 #include <linux/kernel.h> 36 #include <linux/sched.h> 37 #include <linux/string.h> 38 #include <linux/mm.h> 39 #include <linux/errno.h> 40 #include <linux/mtio.h> 41 #include <linux/ioctl.h> 42 #include <linux/fcntl.h> 43 #include <linux/init.h> 44 #include <linux/poll.h> 45 #include <linux/smp_lock.h> 46 #include <linux/moduleparam.h> 47 #include <linux/devfs_fs_kernel.h> 48 #include <linux/cdev.h> 49 #include <linux/seq_file.h> 50 #include <linux/blkdev.h> 51 #include <linux/delay.h> 52 #include <linux/scatterlist.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 = "20050908"; 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 #define SG_SECTOR_SZ 512 100 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) 101 102 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */ 103 104 static int sg_add(struct class_device *, struct class_interface *); 105 static void sg_remove(struct class_device *, struct class_interface *); 106 107 static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock 108 file descriptor list for device */ 109 110 static struct class_interface sg_interface = { 111 .add = sg_add, 112 .remove = sg_remove, 113 }; 114 115 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 116 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 117 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */ 118 unsigned bufflen; /* Size of (aggregate) data buffer */ 119 unsigned b_malloc_len; /* actual len malloc'ed in buffer */ 120 struct scatterlist *buffer;/* scatter list */ 121 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 122 unsigned char cmd_opcode; /* first byte of command */ 123 } Sg_scatter_hold; 124 125 struct sg_device; /* forward declarations */ 126 struct sg_fd; 127 128 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 129 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 130 struct sg_fd *parentfp; /* NULL -> not in use */ 131 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 132 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 133 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; 134 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 135 char orphan; /* 1 -> drop on sight, 0 -> normal */ 136 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 137 volatile char done; /* 0->before bh, 1->before read, 2->read */ 138 } Sg_request; 139 140 typedef struct sg_fd { /* holds the state of a file descriptor */ 141 struct sg_fd *nextfp; /* NULL when last opened fd on this device */ 142 struct sg_device *parentdp; /* owning device */ 143 wait_queue_head_t read_wait; /* queue read until command done */ 144 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 145 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 146 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 147 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 148 unsigned save_scat_len; /* original length of trunc. scat. element */ 149 Sg_request *headrp; /* head of request slist, NULL->empty */ 150 struct fasync_struct *async_qp; /* used by asynchronous notification */ 151 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 152 char low_dma; /* as in parent but possibly overridden to 1 */ 153 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 154 volatile char closed; /* 1 -> fd closed but request(s) outstanding */ 155 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 156 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ 157 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 158 char mmap_called; /* 0 -> mmap() never called on this fd */ 159 } Sg_fd; 160 161 typedef struct sg_device { /* holds the state of each scsi generic device */ 162 struct scsi_device *device; 163 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ 164 int sg_tablesize; /* adapter's max scatter-gather table size */ 165 Sg_fd *headfp; /* first open fd belonging to this device */ 166 volatile char detached; /* 0->attached, 1->detached pending removal */ 167 volatile char exclude; /* opened for exclusive access */ 168 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 169 struct gendisk *disk; 170 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 171 } Sg_device; 172 173 static int sg_fasync(int fd, struct file *filp, int mode); 174 /* tasklet or soft irq callback */ 175 static void sg_cmd_done(void *data, char *sense, int result, int resid); 176 static int sg_start_req(Sg_request * srp); 177 static void sg_finish_rem_req(Sg_request * srp); 178 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 179 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, 180 int tablesize); 181 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 182 Sg_request * srp); 183 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 184 int blocking, int read_only, Sg_request ** o_srp); 185 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 186 unsigned char *cmnd, int timeout, int blocking); 187 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 188 int wr_xf, int *countp, unsigned char __user **up); 189 static int sg_write_xfer(Sg_request * srp); 190 static int sg_read_xfer(Sg_request * srp); 191 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 192 static void sg_remove_scat(Sg_scatter_hold * schp); 193 static void sg_build_reserve(Sg_fd * sfp, int req_size); 194 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 195 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 196 static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp); 197 static void sg_page_free(struct page *page, int size); 198 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 199 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 200 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 201 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 202 static Sg_request *sg_add_request(Sg_fd * sfp); 203 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 204 static int sg_res_in_use(Sg_fd * sfp); 205 static int sg_allow_access(unsigned char opcode, char dev_type); 206 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); 207 static Sg_device *sg_get_dev(int dev); 208 #ifdef CONFIG_SCSI_PROC_FS 209 static int sg_last_dev(void); 210 #endif 211 212 static Sg_device **sg_dev_arr = NULL; 213 static int sg_dev_max; 214 static int sg_nr_dev; 215 216 #define SZ_SG_HEADER sizeof(struct sg_header) 217 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 218 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 219 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 220 221 static int 222 sg_open(struct inode *inode, struct file *filp) 223 { 224 int dev = iminor(inode); 225 int flags = filp->f_flags; 226 struct request_queue *q; 227 Sg_device *sdp; 228 Sg_fd *sfp; 229 int res; 230 int retval; 231 232 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 return -ENXIO; 237 if (sdp->detached) 238 return -ENODEV; 239 240 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 241 /* Prevent the device driver from vanishing while we sleep */ 242 retval = scsi_device_get(sdp->device); 243 if (retval) 244 return retval; 245 246 if (!((flags & O_NONBLOCK) || 247 scsi_block_when_processing_errors(sdp->device))) { 248 retval = -ENXIO; 249 /* we are in error recovery for this device */ 250 goto error_out; 251 } 252 253 if (flags & O_EXCL) { 254 if (O_RDONLY == (flags & O_ACCMODE)) { 255 retval = -EPERM; /* Can't lock it with read only access */ 256 goto error_out; 257 } 258 if (sdp->headfp && (flags & O_NONBLOCK)) { 259 retval = -EBUSY; 260 goto error_out; 261 } 262 res = 0; 263 __wait_event_interruptible(sdp->o_excl_wait, 264 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); 265 if (res) { 266 retval = res; /* -ERESTARTSYS because signal hit process */ 267 goto error_out; 268 } 269 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ 270 if (flags & O_NONBLOCK) { 271 retval = -EBUSY; 272 goto error_out; 273 } 274 res = 0; 275 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), 276 res); 277 if (res) { 278 retval = res; /* -ERESTARTSYS because signal hit process */ 279 goto error_out; 280 } 281 } 282 if (sdp->detached) { 283 retval = -ENODEV; 284 goto error_out; 285 } 286 if (!sdp->headfp) { /* no existing opens on this device */ 287 sdp->sgdebug = 0; 288 q = sdp->device->request_queue; 289 sdp->sg_tablesize = min(q->max_hw_segments, 290 q->max_phys_segments); 291 } 292 if ((sfp = sg_add_sfp(sdp, dev))) 293 filp->private_data = sfp; 294 else { 295 if (flags & O_EXCL) 296 sdp->exclude = 0; /* undo if error */ 297 retval = -ENOMEM; 298 goto error_out; 299 } 300 return 0; 301 302 error_out: 303 scsi_device_put(sdp->device); 304 return retval; 305 } 306 307 /* Following function was formerly called 'sg_close' */ 308 static int 309 sg_release(struct inode *inode, struct file *filp) 310 { 311 Sg_device *sdp; 312 Sg_fd *sfp; 313 314 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 315 return -ENXIO; 316 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 317 sg_fasync(-1, filp, 0); /* remove filp from async notification list */ 318 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ 319 if (!sdp->detached) { 320 scsi_device_put(sdp->device); 321 } 322 sdp->exclude = 0; 323 wake_up_interruptible(&sdp->o_excl_wait); 324 } 325 return 0; 326 } 327 328 static ssize_t 329 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 330 { 331 Sg_device *sdp; 332 Sg_fd *sfp; 333 Sg_request *srp; 334 int req_pack_id = -1; 335 sg_io_hdr_t *hp; 336 struct sg_header *old_hdr = NULL; 337 int retval = 0; 338 339 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 340 return -ENXIO; 341 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 342 sdp->disk->disk_name, (int) count)); 343 344 if (!access_ok(VERIFY_WRITE, buf, count)) 345 return -EFAULT; 346 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 347 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 348 if (!old_hdr) 349 return -ENOMEM; 350 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 351 retval = -EFAULT; 352 goto free_old_hdr; 353 } 354 if (old_hdr->reply_len < 0) { 355 if (count >= SZ_SG_IO_HDR) { 356 sg_io_hdr_t *new_hdr; 357 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 358 if (!new_hdr) { 359 retval = -ENOMEM; 360 goto free_old_hdr; 361 } 362 retval =__copy_from_user 363 (new_hdr, buf, SZ_SG_IO_HDR); 364 req_pack_id = new_hdr->pack_id; 365 kfree(new_hdr); 366 if (retval) { 367 retval = -EFAULT; 368 goto free_old_hdr; 369 } 370 } 371 } else 372 req_pack_id = old_hdr->pack_id; 373 } 374 srp = sg_get_rq_mark(sfp, req_pack_id); 375 if (!srp) { /* now wait on packet to arrive */ 376 if (sdp->detached) { 377 retval = -ENODEV; 378 goto free_old_hdr; 379 } 380 if (filp->f_flags & O_NONBLOCK) { 381 retval = -EAGAIN; 382 goto free_old_hdr; 383 } 384 while (1) { 385 retval = 0; /* following macro beats race condition */ 386 __wait_event_interruptible(sfp->read_wait, 387 (sdp->detached || 388 (srp = sg_get_rq_mark(sfp, req_pack_id))), 389 retval); 390 if (sdp->detached) { 391 retval = -ENODEV; 392 goto free_old_hdr; 393 } 394 if (0 == retval) 395 break; 396 397 /* -ERESTARTSYS as signal hit process */ 398 goto free_old_hdr; 399 } 400 } 401 if (srp->header.interface_id != '\0') { 402 retval = sg_new_read(sfp, buf, count, srp); 403 goto free_old_hdr; 404 } 405 406 hp = &srp->header; 407 if (old_hdr == NULL) { 408 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 409 if (! old_hdr) { 410 retval = -ENOMEM; 411 goto free_old_hdr; 412 } 413 } 414 memset(old_hdr, 0, SZ_SG_HEADER); 415 old_hdr->reply_len = (int) hp->timeout; 416 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 417 old_hdr->pack_id = hp->pack_id; 418 old_hdr->twelve_byte = 419 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 420 old_hdr->target_status = hp->masked_status; 421 old_hdr->host_status = hp->host_status; 422 old_hdr->driver_status = hp->driver_status; 423 if ((CHECK_CONDITION & hp->masked_status) || 424 (DRIVER_SENSE & hp->driver_status)) 425 memcpy(old_hdr->sense_buffer, srp->sense_b, 426 sizeof (old_hdr->sense_buffer)); 427 switch (hp->host_status) { 428 /* This setup of 'result' is for backward compatibility and is best 429 ignored by the user who should use target, host + driver status */ 430 case DID_OK: 431 case DID_PASSTHROUGH: 432 case DID_SOFT_ERROR: 433 old_hdr->result = 0; 434 break; 435 case DID_NO_CONNECT: 436 case DID_BUS_BUSY: 437 case DID_TIME_OUT: 438 old_hdr->result = EBUSY; 439 break; 440 case DID_BAD_TARGET: 441 case DID_ABORT: 442 case DID_PARITY: 443 case DID_RESET: 444 case DID_BAD_INTR: 445 old_hdr->result = EIO; 446 break; 447 case DID_ERROR: 448 old_hdr->result = (srp->sense_b[0] == 0 && 449 hp->masked_status == GOOD) ? 0 : EIO; 450 break; 451 default: 452 old_hdr->result = EIO; 453 break; 454 } 455 456 /* Now copy the result back to the user buffer. */ 457 if (count >= SZ_SG_HEADER) { 458 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 459 retval = -EFAULT; 460 goto free_old_hdr; 461 } 462 buf += SZ_SG_HEADER; 463 if (count > old_hdr->reply_len) 464 count = old_hdr->reply_len; 465 if (count > SZ_SG_HEADER) { 466 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 467 retval = -EFAULT; 468 goto free_old_hdr; 469 } 470 } 471 } else 472 count = (old_hdr->result == 0) ? 0 : -EIO; 473 sg_finish_rem_req(srp); 474 retval = count; 475 free_old_hdr: 476 kfree(old_hdr); 477 return retval; 478 } 479 480 static ssize_t 481 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 482 { 483 sg_io_hdr_t *hp = &srp->header; 484 int err = 0; 485 int len; 486 487 if (count < SZ_SG_IO_HDR) { 488 err = -EINVAL; 489 goto err_out; 490 } 491 hp->sb_len_wr = 0; 492 if ((hp->mx_sb_len > 0) && hp->sbp) { 493 if ((CHECK_CONDITION & hp->masked_status) || 494 (DRIVER_SENSE & hp->driver_status)) { 495 int sb_len = SCSI_SENSE_BUFFERSIZE; 496 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 497 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 498 len = (len > sb_len) ? sb_len : len; 499 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 500 err = -EFAULT; 501 goto err_out; 502 } 503 hp->sb_len_wr = len; 504 } 505 } 506 if (hp->masked_status || hp->host_status || hp->driver_status) 507 hp->info |= SG_INFO_CHECK; 508 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 509 err = -EFAULT; 510 goto err_out; 511 } 512 err = sg_read_xfer(srp); 513 err_out: 514 sg_finish_rem_req(srp); 515 return (0 == err) ? count : err; 516 } 517 518 static ssize_t 519 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 520 { 521 int mxsize, cmd_size, k; 522 int input_size, blocking; 523 unsigned char opcode; 524 Sg_device *sdp; 525 Sg_fd *sfp; 526 Sg_request *srp; 527 struct sg_header old_hdr; 528 sg_io_hdr_t *hp; 529 unsigned char cmnd[MAX_COMMAND_SIZE]; 530 531 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 532 return -ENXIO; 533 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 534 sdp->disk->disk_name, (int) count)); 535 if (sdp->detached) 536 return -ENODEV; 537 if (!((filp->f_flags & O_NONBLOCK) || 538 scsi_block_when_processing_errors(sdp->device))) 539 return -ENXIO; 540 541 if (!access_ok(VERIFY_READ, buf, count)) 542 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 543 if (count < SZ_SG_HEADER) 544 return -EIO; 545 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 546 return -EFAULT; 547 blocking = !(filp->f_flags & O_NONBLOCK); 548 if (old_hdr.reply_len < 0) 549 return sg_new_write(sfp, buf, count, blocking, 0, NULL); 550 if (count < (SZ_SG_HEADER + 6)) 551 return -EIO; /* The minimum scsi command length is 6 bytes. */ 552 553 if (!(srp = sg_add_request(sfp))) { 554 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 555 return -EDOM; 556 } 557 buf += SZ_SG_HEADER; 558 __get_user(opcode, buf); 559 if (sfp->next_cmd_len > 0) { 560 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 561 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 562 sfp->next_cmd_len = 0; 563 sg_remove_request(sfp, srp); 564 return -EIO; 565 } 566 cmd_size = sfp->next_cmd_len; 567 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 568 } else { 569 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 570 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 571 cmd_size = 12; 572 } 573 SCSI_LOG_TIMEOUT(4, printk( 574 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 575 /* Determine buffer size. */ 576 input_size = count - cmd_size; 577 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 578 mxsize -= SZ_SG_HEADER; 579 input_size -= SZ_SG_HEADER; 580 if (input_size < 0) { 581 sg_remove_request(sfp, srp); 582 return -EIO; /* User did not pass enough bytes for this command. */ 583 } 584 hp = &srp->header; 585 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 586 hp->cmd_len = (unsigned char) cmd_size; 587 hp->iovec_count = 0; 588 hp->mx_sb_len = 0; 589 if (input_size > 0) 590 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 591 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 592 else 593 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 594 hp->dxfer_len = mxsize; 595 hp->dxferp = (char __user *)buf + cmd_size; 596 hp->sbp = NULL; 597 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 598 hp->flags = input_size; /* structure abuse ... */ 599 hp->pack_id = old_hdr.pack_id; 600 hp->usr_ptr = NULL; 601 if (__copy_from_user(cmnd, buf, cmd_size)) 602 return -EFAULT; 603 /* 604 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 605 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 606 * is a non-zero input_size, so emit a warning. 607 */ 608 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) 609 if (printk_ratelimit()) 610 printk(KERN_WARNING 611 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" 612 "guessing data in;\n" KERN_WARNING " " 613 "program %s not setting count and/or reply_len properly\n", 614 old_hdr.reply_len - (int)SZ_SG_HEADER, 615 input_size, (unsigned int) cmnd[0], 616 current->comm); 617 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 618 return (k < 0) ? k : count; 619 } 620 621 static ssize_t 622 sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 623 int blocking, int read_only, Sg_request ** o_srp) 624 { 625 int k; 626 Sg_request *srp; 627 sg_io_hdr_t *hp; 628 unsigned char cmnd[MAX_COMMAND_SIZE]; 629 int timeout; 630 unsigned long ul_timeout; 631 632 if (count < SZ_SG_IO_HDR) 633 return -EINVAL; 634 if (!access_ok(VERIFY_READ, buf, count)) 635 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 636 637 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 638 if (!(srp = sg_add_request(sfp))) { 639 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 640 return -EDOM; 641 } 642 hp = &srp->header; 643 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 644 sg_remove_request(sfp, srp); 645 return -EFAULT; 646 } 647 if (hp->interface_id != 'S') { 648 sg_remove_request(sfp, srp); 649 return -ENOSYS; 650 } 651 if (hp->flags & SG_FLAG_MMAP_IO) { 652 if (hp->dxfer_len > sfp->reserve.bufflen) { 653 sg_remove_request(sfp, srp); 654 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 655 } 656 if (hp->flags & SG_FLAG_DIRECT_IO) { 657 sg_remove_request(sfp, srp); 658 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 659 } 660 if (sg_res_in_use(sfp)) { 661 sg_remove_request(sfp, srp); 662 return -EBUSY; /* reserve buffer already being used */ 663 } 664 } 665 ul_timeout = msecs_to_jiffies(srp->header.timeout); 666 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 667 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 668 sg_remove_request(sfp, srp); 669 return -EMSGSIZE; 670 } 671 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 672 sg_remove_request(sfp, srp); 673 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 674 } 675 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 676 sg_remove_request(sfp, srp); 677 return -EFAULT; 678 } 679 if (read_only && 680 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) { 681 sg_remove_request(sfp, srp); 682 return -EPERM; 683 } 684 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 685 if (k < 0) 686 return k; 687 if (o_srp) 688 *o_srp = srp; 689 return count; 690 } 691 692 static int 693 sg_common_write(Sg_fd * sfp, Sg_request * srp, 694 unsigned char *cmnd, int timeout, int blocking) 695 { 696 int k, data_dir; 697 Sg_device *sdp = sfp->parentdp; 698 sg_io_hdr_t *hp = &srp->header; 699 700 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 701 hp->status = 0; 702 hp->masked_status = 0; 703 hp->msg_status = 0; 704 hp->info = 0; 705 hp->host_status = 0; 706 hp->driver_status = 0; 707 hp->resid = 0; 708 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 709 (int) cmnd[0], (int) hp->cmd_len)); 710 711 if ((k = sg_start_req(srp))) { 712 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k)); 713 sg_finish_rem_req(srp); 714 return k; /* probably out of space --> ENOMEM */ 715 } 716 if ((k = sg_write_xfer(srp))) { 717 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n")); 718 sg_finish_rem_req(srp); 719 return k; 720 } 721 if (sdp->detached) { 722 sg_finish_rem_req(srp); 723 return -ENODEV; 724 } 725 726 switch (hp->dxfer_direction) { 727 case SG_DXFER_TO_FROM_DEV: 728 case SG_DXFER_FROM_DEV: 729 data_dir = DMA_FROM_DEVICE; 730 break; 731 case SG_DXFER_TO_DEV: 732 data_dir = DMA_TO_DEVICE; 733 break; 734 case SG_DXFER_UNKNOWN: 735 data_dir = DMA_BIDIRECTIONAL; 736 break; 737 default: 738 data_dir = DMA_NONE; 739 break; 740 } 741 hp->duration = jiffies_to_msecs(jiffies); 742 /* Now send everything of to mid-level. The next time we hear about this 743 packet is when sg_cmd_done() is called (i.e. a callback). */ 744 if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer, 745 hp->dxfer_len, srp->data.k_use_sg, timeout, 746 SG_DEFAULT_RETRIES, srp, sg_cmd_done, 747 GFP_ATOMIC)) { 748 SCSI_LOG_TIMEOUT(1, printk("sg_write: scsi_execute_async failed\n")); 749 /* 750 * most likely out of mem, but could also be a bad map 751 */ 752 return -ENOMEM; 753 } else 754 return 0; 755 } 756 757 static int 758 sg_srp_done(Sg_request *srp, Sg_fd *sfp) 759 { 760 unsigned long iflags; 761 int done; 762 763 read_lock_irqsave(&sfp->rq_list_lock, iflags); 764 done = srp->done; 765 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 766 return done; 767 } 768 769 static int 770 sg_ioctl(struct inode *inode, struct file *filp, 771 unsigned int cmd_in, unsigned long arg) 772 { 773 void __user *p = (void __user *)arg; 774 int __user *ip = p; 775 int result, val, read_only; 776 Sg_device *sdp; 777 Sg_fd *sfp; 778 Sg_request *srp; 779 unsigned long iflags; 780 781 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 782 return -ENXIO; 783 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 784 sdp->disk->disk_name, (int) cmd_in)); 785 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 786 787 switch (cmd_in) { 788 case SG_IO: 789 { 790 int blocking = 1; /* ignore O_NONBLOCK flag */ 791 792 if (sdp->detached) 793 return -ENODEV; 794 if (!scsi_block_when_processing_errors(sdp->device)) 795 return -ENXIO; 796 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 797 return -EFAULT; 798 result = 799 sg_new_write(sfp, p, SZ_SG_IO_HDR, 800 blocking, read_only, &srp); 801 if (result < 0) 802 return result; 803 srp->sg_io_owned = 1; 804 while (1) { 805 result = 0; /* following macro to beat race condition */ 806 __wait_event_interruptible(sfp->read_wait, 807 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), 808 result); 809 if (sdp->detached) 810 return -ENODEV; 811 if (sfp->closed) 812 return 0; /* request packet dropped already */ 813 if (0 == result) 814 break; 815 srp->orphan = 1; 816 return result; /* -ERESTARTSYS because signal hit process */ 817 } 818 write_lock_irqsave(&sfp->rq_list_lock, iflags); 819 srp->done = 2; 820 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 821 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 822 return (result < 0) ? result : 0; 823 } 824 case SG_SET_TIMEOUT: 825 result = get_user(val, ip); 826 if (result) 827 return result; 828 if (val < 0) 829 return -EIO; 830 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 831 val = MULDIV (INT_MAX, USER_HZ, HZ); 832 sfp->timeout_user = val; 833 sfp->timeout = MULDIV (val, HZ, USER_HZ); 834 835 return 0; 836 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 837 /* strange ..., for backward compatibility */ 838 return sfp->timeout_user; 839 case SG_SET_FORCE_LOW_DMA: 840 result = get_user(val, ip); 841 if (result) 842 return result; 843 if (val) { 844 sfp->low_dma = 1; 845 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 846 val = (int) sfp->reserve.bufflen; 847 sg_remove_scat(&sfp->reserve); 848 sg_build_reserve(sfp, val); 849 } 850 } else { 851 if (sdp->detached) 852 return -ENODEV; 853 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 854 } 855 return 0; 856 case SG_GET_LOW_DMA: 857 return put_user((int) sfp->low_dma, ip); 858 case SG_GET_SCSI_ID: 859 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 860 return -EFAULT; 861 else { 862 sg_scsi_id_t __user *sg_idp = p; 863 864 if (sdp->detached) 865 return -ENODEV; 866 __put_user((int) sdp->device->host->host_no, 867 &sg_idp->host_no); 868 __put_user((int) sdp->device->channel, 869 &sg_idp->channel); 870 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 871 __put_user((int) sdp->device->lun, &sg_idp->lun); 872 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 873 __put_user((short) sdp->device->host->cmd_per_lun, 874 &sg_idp->h_cmd_per_lun); 875 __put_user((short) sdp->device->queue_depth, 876 &sg_idp->d_queue_depth); 877 __put_user(0, &sg_idp->unused[0]); 878 __put_user(0, &sg_idp->unused[1]); 879 return 0; 880 } 881 case SG_SET_FORCE_PACK_ID: 882 result = get_user(val, ip); 883 if (result) 884 return result; 885 sfp->force_packid = val ? 1 : 0; 886 return 0; 887 case SG_GET_PACK_ID: 888 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 889 return -EFAULT; 890 read_lock_irqsave(&sfp->rq_list_lock, iflags); 891 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 892 if ((1 == srp->done) && (!srp->sg_io_owned)) { 893 read_unlock_irqrestore(&sfp->rq_list_lock, 894 iflags); 895 __put_user(srp->header.pack_id, ip); 896 return 0; 897 } 898 } 899 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 900 __put_user(-1, ip); 901 return 0; 902 case SG_GET_NUM_WAITING: 903 read_lock_irqsave(&sfp->rq_list_lock, iflags); 904 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 905 if ((1 == srp->done) && (!srp->sg_io_owned)) 906 ++val; 907 } 908 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 909 return put_user(val, ip); 910 case SG_GET_SG_TABLESIZE: 911 return put_user(sdp->sg_tablesize, ip); 912 case SG_SET_RESERVED_SIZE: 913 result = get_user(val, ip); 914 if (result) 915 return result; 916 if (val < 0) 917 return -EINVAL; 918 if (val != sfp->reserve.bufflen) { 919 if (sg_res_in_use(sfp) || sfp->mmap_called) 920 return -EBUSY; 921 sg_remove_scat(&sfp->reserve); 922 sg_build_reserve(sfp, val); 923 } 924 return 0; 925 case SG_GET_RESERVED_SIZE: 926 val = (int) sfp->reserve.bufflen; 927 return put_user(val, ip); 928 case SG_SET_COMMAND_Q: 929 result = get_user(val, ip); 930 if (result) 931 return result; 932 sfp->cmd_q = val ? 1 : 0; 933 return 0; 934 case SG_GET_COMMAND_Q: 935 return put_user((int) sfp->cmd_q, ip); 936 case SG_SET_KEEP_ORPHAN: 937 result = get_user(val, ip); 938 if (result) 939 return result; 940 sfp->keep_orphan = val; 941 return 0; 942 case SG_GET_KEEP_ORPHAN: 943 return put_user((int) sfp->keep_orphan, ip); 944 case SG_NEXT_CMD_LEN: 945 result = get_user(val, ip); 946 if (result) 947 return result; 948 sfp->next_cmd_len = (val > 0) ? val : 0; 949 return 0; 950 case SG_GET_VERSION_NUM: 951 return put_user(sg_version_num, ip); 952 case SG_GET_ACCESS_COUNT: 953 /* faked - we don't have a real access count anymore */ 954 val = (sdp->device ? 1 : 0); 955 return put_user(val, ip); 956 case SG_GET_REQUEST_TABLE: 957 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 958 return -EFAULT; 959 else { 960 sg_req_info_t *rinfo; 961 unsigned int ms; 962 963 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 964 GFP_KERNEL); 965 if (!rinfo) 966 return -ENOMEM; 967 read_lock_irqsave(&sfp->rq_list_lock, iflags); 968 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 969 ++val, srp = srp ? srp->nextrp : srp) { 970 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 971 if (srp) { 972 rinfo[val].req_state = srp->done + 1; 973 rinfo[val].problem = 974 srp->header.masked_status & 975 srp->header.host_status & 976 srp->header.driver_status; 977 if (srp->done) 978 rinfo[val].duration = 979 srp->header.duration; 980 else { 981 ms = jiffies_to_msecs(jiffies); 982 rinfo[val].duration = 983 (ms > srp->header.duration) ? 984 (ms - srp->header.duration) : 0; 985 } 986 rinfo[val].orphan = srp->orphan; 987 rinfo[val].sg_io_owned = 988 srp->sg_io_owned; 989 rinfo[val].pack_id = 990 srp->header.pack_id; 991 rinfo[val].usr_ptr = 992 srp->header.usr_ptr; 993 } 994 } 995 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 996 result = __copy_to_user(p, rinfo, 997 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 998 result = result ? -EFAULT : 0; 999 kfree(rinfo); 1000 return result; 1001 } 1002 case SG_EMULATED_HOST: 1003 if (sdp->detached) 1004 return -ENODEV; 1005 return put_user(sdp->device->host->hostt->emulated, ip); 1006 case SG_SCSI_RESET: 1007 if (sdp->detached) 1008 return -ENODEV; 1009 if (filp->f_flags & O_NONBLOCK) { 1010 if (scsi_host_in_recovery(sdp->device->host)) 1011 return -EBUSY; 1012 } else if (!scsi_block_when_processing_errors(sdp->device)) 1013 return -EBUSY; 1014 result = get_user(val, ip); 1015 if (result) 1016 return result; 1017 if (SG_SCSI_RESET_NOTHING == val) 1018 return 0; 1019 switch (val) { 1020 case SG_SCSI_RESET_DEVICE: 1021 val = SCSI_TRY_RESET_DEVICE; 1022 break; 1023 case SG_SCSI_RESET_BUS: 1024 val = SCSI_TRY_RESET_BUS; 1025 break; 1026 case SG_SCSI_RESET_HOST: 1027 val = SCSI_TRY_RESET_HOST; 1028 break; 1029 default: 1030 return -EINVAL; 1031 } 1032 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1033 return -EACCES; 1034 return (scsi_reset_provider(sdp->device, val) == 1035 SUCCESS) ? 0 : -EIO; 1036 case SCSI_IOCTL_SEND_COMMAND: 1037 if (sdp->detached) 1038 return -ENODEV; 1039 if (read_only) { 1040 unsigned char opcode = WRITE_6; 1041 Scsi_Ioctl_Command __user *siocp = p; 1042 1043 if (copy_from_user(&opcode, siocp->data, 1)) 1044 return -EFAULT; 1045 if (!sg_allow_access(opcode, sdp->device->type)) 1046 return -EPERM; 1047 } 1048 return scsi_ioctl_send_command(sdp->device, p); 1049 case SG_SET_DEBUG: 1050 result = get_user(val, ip); 1051 if (result) 1052 return result; 1053 sdp->sgdebug = (char) val; 1054 return 0; 1055 case SCSI_IOCTL_GET_IDLUN: 1056 case SCSI_IOCTL_GET_BUS_NUMBER: 1057 case SCSI_IOCTL_PROBE_HOST: 1058 case SG_GET_TRANSFORM: 1059 if (sdp->detached) 1060 return -ENODEV; 1061 return scsi_ioctl(sdp->device, cmd_in, p); 1062 default: 1063 if (read_only) 1064 return -EPERM; /* don't know so take safe approach */ 1065 return scsi_ioctl(sdp->device, cmd_in, p); 1066 } 1067 } 1068 1069 #ifdef CONFIG_COMPAT 1070 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1071 { 1072 Sg_device *sdp; 1073 Sg_fd *sfp; 1074 struct scsi_device *sdev; 1075 1076 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1077 return -ENXIO; 1078 1079 sdev = sdp->device; 1080 if (sdev->host->hostt->compat_ioctl) { 1081 int ret; 1082 1083 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1084 1085 return ret; 1086 } 1087 1088 return -ENOIOCTLCMD; 1089 } 1090 #endif 1091 1092 static unsigned int 1093 sg_poll(struct file *filp, poll_table * wait) 1094 { 1095 unsigned int res = 0; 1096 Sg_device *sdp; 1097 Sg_fd *sfp; 1098 Sg_request *srp; 1099 int count = 0; 1100 unsigned long iflags; 1101 1102 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) 1103 || sfp->closed) 1104 return POLLERR; 1105 poll_wait(filp, &sfp->read_wait, wait); 1106 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1107 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1108 /* if any read waiting, flag it */ 1109 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1110 res = POLLIN | POLLRDNORM; 1111 ++count; 1112 } 1113 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1114 1115 if (sdp->detached) 1116 res |= POLLHUP; 1117 else if (!sfp->cmd_q) { 1118 if (0 == count) 1119 res |= POLLOUT | POLLWRNORM; 1120 } else if (count < SG_MAX_QUEUE) 1121 res |= POLLOUT | POLLWRNORM; 1122 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1123 sdp->disk->disk_name, (int) res)); 1124 return res; 1125 } 1126 1127 static int 1128 sg_fasync(int fd, struct file *filp, int mode) 1129 { 1130 int retval; 1131 Sg_device *sdp; 1132 Sg_fd *sfp; 1133 1134 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1135 return -ENXIO; 1136 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1137 sdp->disk->disk_name, mode)); 1138 1139 retval = fasync_helper(fd, filp, mode, &sfp->async_qp); 1140 return (retval < 0) ? retval : 0; 1141 } 1142 1143 /* When startFinish==1 increments page counts for pages other than the 1144 first of scatter gather elements obtained from alloc_pages(). 1145 When startFinish==0 decrements ... */ 1146 static void 1147 sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish) 1148 { 1149 struct scatterlist *sg = rsv_schp->buffer; 1150 struct page *page; 1151 int k, m; 1152 1153 SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n", 1154 startFinish, rsv_schp->k_use_sg)); 1155 /* N.B. correction _not_ applied to base page of each allocation */ 1156 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sg) { 1157 for (m = PAGE_SIZE; m < sg->length; m += PAGE_SIZE) { 1158 page = sg->page; 1159 if (startFinish) 1160 get_page(page); 1161 else { 1162 if (page_count(page) > 0) 1163 __put_page(page); 1164 } 1165 } 1166 } 1167 } 1168 1169 static struct page * 1170 sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type) 1171 { 1172 Sg_fd *sfp; 1173 struct page *page = NOPAGE_SIGBUS; 1174 unsigned long offset, len, sa; 1175 Sg_scatter_hold *rsv_schp; 1176 struct scatterlist *sg; 1177 int k; 1178 1179 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1180 return page; 1181 rsv_schp = &sfp->reserve; 1182 offset = addr - vma->vm_start; 1183 if (offset >= rsv_schp->bufflen) 1184 return page; 1185 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n", 1186 offset, rsv_schp->k_use_sg)); 1187 sg = rsv_schp->buffer; 1188 sa = vma->vm_start; 1189 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1190 ++k, ++sg) { 1191 len = vma->vm_end - sa; 1192 len = (len < sg->length) ? len : sg->length; 1193 if (offset < len) { 1194 page = sg->page; 1195 get_page(page); /* increment page count */ 1196 break; 1197 } 1198 sa += len; 1199 offset -= len; 1200 } 1201 1202 if (type) 1203 *type = VM_FAULT_MINOR; 1204 return page; 1205 } 1206 1207 static struct vm_operations_struct sg_mmap_vm_ops = { 1208 .nopage = sg_vma_nopage, 1209 }; 1210 1211 static int 1212 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1213 { 1214 Sg_fd *sfp; 1215 unsigned long req_sz, len, sa; 1216 Sg_scatter_hold *rsv_schp; 1217 int k; 1218 struct scatterlist *sg; 1219 1220 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1221 return -ENXIO; 1222 req_sz = vma->vm_end - vma->vm_start; 1223 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1224 (void *) vma->vm_start, (int) req_sz)); 1225 if (vma->vm_pgoff) 1226 return -EINVAL; /* want no offset */ 1227 rsv_schp = &sfp->reserve; 1228 if (req_sz > rsv_schp->bufflen) 1229 return -ENOMEM; /* cannot map more than reserved buffer */ 1230 1231 sa = vma->vm_start; 1232 sg = rsv_schp->buffer; 1233 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1234 ++k, ++sg) { 1235 len = vma->vm_end - sa; 1236 len = (len < sg->length) ? len : sg->length; 1237 sa += len; 1238 } 1239 1240 if (0 == sfp->mmap_called) { 1241 sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */ 1242 sfp->mmap_called = 1; 1243 } 1244 vma->vm_flags |= VM_RESERVED; 1245 vma->vm_private_data = sfp; 1246 vma->vm_ops = &sg_mmap_vm_ops; 1247 return 0; 1248 } 1249 1250 /* This function is a "bottom half" handler that is called by the 1251 * mid level when a command is completed (or has failed). */ 1252 static void 1253 sg_cmd_done(void *data, char *sense, int result, int resid) 1254 { 1255 Sg_request *srp = data; 1256 Sg_device *sdp = NULL; 1257 Sg_fd *sfp; 1258 unsigned long iflags; 1259 unsigned int ms; 1260 1261 if (NULL == srp) { 1262 printk(KERN_ERR "sg_cmd_done: NULL request\n"); 1263 return; 1264 } 1265 sfp = srp->parentfp; 1266 if (sfp) 1267 sdp = sfp->parentdp; 1268 if ((NULL == sdp) || sdp->detached) { 1269 printk(KERN_INFO "sg_cmd_done: device detached\n"); 1270 return; 1271 } 1272 1273 1274 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1275 sdp->disk->disk_name, srp->header.pack_id, result)); 1276 srp->header.resid = resid; 1277 ms = jiffies_to_msecs(jiffies); 1278 srp->header.duration = (ms > srp->header.duration) ? 1279 (ms - srp->header.duration) : 0; 1280 if (0 != result) { 1281 struct scsi_sense_hdr sshdr; 1282 1283 memcpy(srp->sense_b, sense, sizeof (srp->sense_b)); 1284 srp->header.status = 0xff & result; 1285 srp->header.masked_status = status_byte(result); 1286 srp->header.msg_status = msg_byte(result); 1287 srp->header.host_status = host_byte(result); 1288 srp->header.driver_status = driver_byte(result); 1289 if ((sdp->sgdebug > 0) && 1290 ((CHECK_CONDITION == srp->header.masked_status) || 1291 (COMMAND_TERMINATED == srp->header.masked_status))) 1292 __scsi_print_sense("sg_cmd_done", sense, 1293 SCSI_SENSE_BUFFERSIZE); 1294 1295 /* Following if statement is a patch supplied by Eric Youngdale */ 1296 if (driver_byte(result) != 0 1297 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1298 && !scsi_sense_is_deferred(&sshdr) 1299 && sshdr.sense_key == UNIT_ATTENTION 1300 && sdp->device->removable) { 1301 /* Detected possible disc change. Set the bit - this */ 1302 /* may be used if there are filesystems using this device */ 1303 sdp->device->changed = 1; 1304 } 1305 } 1306 /* Rely on write phase to clean out srp status values, so no "else" */ 1307 1308 if (sfp->closed) { /* whoops this fd already released, cleanup */ 1309 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); 1310 sg_finish_rem_req(srp); 1311 srp = NULL; 1312 if (NULL == sfp->headrp) { 1313 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n")); 1314 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ 1315 scsi_device_put(sdp->device); 1316 } 1317 sfp = NULL; 1318 } 1319 } else if (srp && srp->orphan) { 1320 if (sfp->keep_orphan) 1321 srp->sg_io_owned = 0; 1322 else { 1323 sg_finish_rem_req(srp); 1324 srp = NULL; 1325 } 1326 } 1327 if (sfp && srp) { 1328 /* Now wake up any sg_read() that is waiting for this packet. */ 1329 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1330 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1331 srp->done = 1; 1332 wake_up_interruptible(&sfp->read_wait); 1333 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1334 } 1335 } 1336 1337 static struct file_operations sg_fops = { 1338 .owner = THIS_MODULE, 1339 .read = sg_read, 1340 .write = sg_write, 1341 .poll = sg_poll, 1342 .ioctl = sg_ioctl, 1343 #ifdef CONFIG_COMPAT 1344 .compat_ioctl = sg_compat_ioctl, 1345 #endif 1346 .open = sg_open, 1347 .mmap = sg_mmap, 1348 .release = sg_release, 1349 .fasync = sg_fasync, 1350 }; 1351 1352 static struct class *sg_sysfs_class; 1353 1354 static int sg_sysfs_valid = 0; 1355 1356 static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1357 { 1358 struct request_queue *q = scsidp->request_queue; 1359 Sg_device *sdp; 1360 unsigned long iflags; 1361 void *old_sg_dev_arr = NULL; 1362 int k, error; 1363 1364 sdp = kmalloc(sizeof(Sg_device), GFP_KERNEL); 1365 if (!sdp) { 1366 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1367 return -ENOMEM; 1368 } 1369 1370 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1371 if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */ 1372 Sg_device **tmp_da; 1373 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP; 1374 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1375 1376 tmp_da = kmalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL); 1377 if (unlikely(!tmp_da)) 1378 goto expand_failed; 1379 1380 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1381 memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *)); 1382 memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *)); 1383 old_sg_dev_arr = sg_dev_arr; 1384 sg_dev_arr = tmp_da; 1385 sg_dev_max = tmp_dev_max; 1386 } 1387 1388 for (k = 0; k < sg_dev_max; k++) 1389 if (!sg_dev_arr[k]) 1390 break; 1391 if (unlikely(k >= SG_MAX_DEVS)) 1392 goto overflow; 1393 1394 memset(sdp, 0, sizeof(*sdp)); 1395 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1396 sprintf(disk->disk_name, "sg%d", k); 1397 disk->first_minor = k; 1398 sdp->disk = disk; 1399 sdp->device = scsidp; 1400 init_waitqueue_head(&sdp->o_excl_wait); 1401 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments); 1402 1403 sg_nr_dev++; 1404 sg_dev_arr[k] = sdp; 1405 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1406 error = k; 1407 1408 out: 1409 if (error < 0) 1410 kfree(sdp); 1411 kfree(old_sg_dev_arr); 1412 return error; 1413 1414 expand_failed: 1415 printk(KERN_WARNING "sg_alloc: device array cannot be resized\n"); 1416 error = -ENOMEM; 1417 goto out; 1418 1419 overflow: 1420 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1421 sdev_printk(KERN_WARNING, scsidp, 1422 "Unable to attach sg device type=%d, minor " 1423 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); 1424 error = -ENODEV; 1425 goto out; 1426 } 1427 1428 static int 1429 sg_add(struct class_device *cl_dev, struct class_interface *cl_intf) 1430 { 1431 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); 1432 struct gendisk *disk; 1433 Sg_device *sdp = NULL; 1434 struct cdev * cdev = NULL; 1435 int error, k; 1436 1437 disk = alloc_disk(1); 1438 if (!disk) { 1439 printk(KERN_WARNING "alloc_disk failed\n"); 1440 return -ENOMEM; 1441 } 1442 disk->major = SCSI_GENERIC_MAJOR; 1443 1444 error = -ENOMEM; 1445 cdev = cdev_alloc(); 1446 if (!cdev) { 1447 printk(KERN_WARNING "cdev_alloc failed\n"); 1448 goto out; 1449 } 1450 cdev->owner = THIS_MODULE; 1451 cdev->ops = &sg_fops; 1452 1453 error = sg_alloc(disk, scsidp); 1454 if (error < 0) { 1455 printk(KERN_WARNING "sg_alloc failed\n"); 1456 goto out; 1457 } 1458 k = error; 1459 sdp = sg_dev_arr[k]; 1460 1461 devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k), 1462 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, 1463 "%s/generic", scsidp->devfs_name); 1464 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1); 1465 if (error) { 1466 devfs_remove("%s/generic", scsidp->devfs_name); 1467 goto out; 1468 } 1469 sdp->cdev = cdev; 1470 if (sg_sysfs_valid) { 1471 struct class_device * sg_class_member; 1472 1473 sg_class_member = class_device_create(sg_sysfs_class, NULL, 1474 MKDEV(SCSI_GENERIC_MAJOR, k), 1475 cl_dev->dev, "%s", 1476 disk->disk_name); 1477 if (IS_ERR(sg_class_member)) 1478 printk(KERN_WARNING "sg_add: " 1479 "class_device_create failed\n"); 1480 class_set_devdata(sg_class_member, sdp); 1481 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1482 &sg_class_member->kobj, "generic"); 1483 if (error) 1484 printk(KERN_ERR "sg_add: unable to make symlink " 1485 "'generic' back to sg%d\n", k); 1486 } else 1487 printk(KERN_WARNING "sg_add: sg_sys INvalid\n"); 1488 1489 sdev_printk(KERN_NOTICE, scsidp, 1490 "Attached scsi generic sg%d type %d\n", k,scsidp->type); 1491 1492 return 0; 1493 1494 out: 1495 put_disk(disk); 1496 if (cdev) 1497 cdev_del(cdev); 1498 return error; 1499 } 1500 1501 static void 1502 sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf) 1503 { 1504 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); 1505 Sg_device *sdp = NULL; 1506 unsigned long iflags; 1507 Sg_fd *sfp; 1508 Sg_fd *tsfp; 1509 Sg_request *srp; 1510 Sg_request *tsrp; 1511 int k, delay; 1512 1513 if (NULL == sg_dev_arr) 1514 return; 1515 delay = 0; 1516 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1517 for (k = 0; k < sg_dev_max; k++) { 1518 sdp = sg_dev_arr[k]; 1519 if ((NULL == sdp) || (sdp->device != scsidp)) 1520 continue; /* dirty but lowers nesting */ 1521 if (sdp->headfp) { 1522 sdp->detached = 1; 1523 for (sfp = sdp->headfp; sfp; sfp = tsfp) { 1524 tsfp = sfp->nextfp; 1525 for (srp = sfp->headrp; srp; srp = tsrp) { 1526 tsrp = srp->nextrp; 1527 if (sfp->closed || (0 == sg_srp_done(srp, sfp))) 1528 sg_finish_rem_req(srp); 1529 } 1530 if (sfp->closed) { 1531 scsi_device_put(sdp->device); 1532 __sg_remove_sfp(sdp, sfp); 1533 } else { 1534 delay = 1; 1535 wake_up_interruptible(&sfp->read_wait); 1536 kill_fasync(&sfp->async_qp, SIGPOLL, 1537 POLL_HUP); 1538 } 1539 } 1540 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k)); 1541 if (NULL == sdp->headfp) { 1542 sg_dev_arr[k] = NULL; 1543 } 1544 } else { /* nothing active, simple case */ 1545 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k)); 1546 sg_dev_arr[k] = NULL; 1547 } 1548 sg_nr_dev--; 1549 break; 1550 } 1551 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1552 1553 if (sdp) { 1554 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1555 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k)); 1556 cdev_del(sdp->cdev); 1557 sdp->cdev = NULL; 1558 devfs_remove("%s/generic", scsidp->devfs_name); 1559 put_disk(sdp->disk); 1560 sdp->disk = NULL; 1561 if (NULL == sdp->headfp) 1562 kfree((char *) sdp); 1563 } 1564 1565 if (delay) 1566 msleep(10); /* dirty detach so delay device destruction */ 1567 } 1568 1569 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 1570 * of sysfs parameters (which module_param doesn't yet support). 1571 * Sysfs parameters defined explicitly below. 1572 */ 1573 module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO); 1574 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1575 1576 MODULE_AUTHOR("Douglas Gilbert"); 1577 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1578 MODULE_LICENSE("GPL"); 1579 MODULE_VERSION(SG_VERSION_STR); 1580 1581 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1582 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1583 1584 static int __init 1585 init_sg(void) 1586 { 1587 int rc; 1588 1589 if (def_reserved_size >= 0) 1590 sg_big_buff = def_reserved_size; 1591 1592 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1593 SG_MAX_DEVS, "sg"); 1594 if (rc) 1595 return rc; 1596 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1597 if ( IS_ERR(sg_sysfs_class) ) { 1598 rc = PTR_ERR(sg_sysfs_class); 1599 goto err_out; 1600 } 1601 sg_sysfs_valid = 1; 1602 rc = scsi_register_interface(&sg_interface); 1603 if (0 == rc) { 1604 #ifdef CONFIG_SCSI_PROC_FS 1605 sg_proc_init(); 1606 #endif /* CONFIG_SCSI_PROC_FS */ 1607 return 0; 1608 } 1609 class_destroy(sg_sysfs_class); 1610 err_out: 1611 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1612 return rc; 1613 } 1614 1615 static void __exit 1616 exit_sg(void) 1617 { 1618 #ifdef CONFIG_SCSI_PROC_FS 1619 sg_proc_cleanup(); 1620 #endif /* CONFIG_SCSI_PROC_FS */ 1621 scsi_unregister_interface(&sg_interface); 1622 class_destroy(sg_sysfs_class); 1623 sg_sysfs_valid = 0; 1624 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1625 SG_MAX_DEVS); 1626 kfree((char *)sg_dev_arr); 1627 sg_dev_arr = NULL; 1628 sg_dev_max = 0; 1629 } 1630 1631 static int 1632 sg_start_req(Sg_request * srp) 1633 { 1634 int res; 1635 Sg_fd *sfp = srp->parentfp; 1636 sg_io_hdr_t *hp = &srp->header; 1637 int dxfer_len = (int) hp->dxfer_len; 1638 int dxfer_dir = hp->dxfer_direction; 1639 Sg_scatter_hold *req_schp = &srp->data; 1640 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1641 1642 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); 1643 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1644 return 0; 1645 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && 1646 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && 1647 (!sfp->parentdp->device->host->unchecked_isa_dma)) { 1648 res = sg_build_direct(srp, sfp, dxfer_len); 1649 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ 1650 return res; 1651 } 1652 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) 1653 sg_link_reserve(sfp, srp, dxfer_len); 1654 else { 1655 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1656 if (res) { 1657 sg_remove_scat(req_schp); 1658 return res; 1659 } 1660 } 1661 return 0; 1662 } 1663 1664 static void 1665 sg_finish_rem_req(Sg_request * srp) 1666 { 1667 Sg_fd *sfp = srp->parentfp; 1668 Sg_scatter_hold *req_schp = &srp->data; 1669 1670 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1671 if (srp->res_used) 1672 sg_unlink_reserve(sfp, srp); 1673 else 1674 sg_remove_scat(req_schp); 1675 sg_remove_request(sfp, srp); 1676 } 1677 1678 static int 1679 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1680 { 1681 int sg_bufflen = tablesize * sizeof(struct scatterlist); 1682 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1683 1684 /* 1685 * TODO: test without low_dma, we should not need it since 1686 * the block layer will bounce the buffer for us 1687 * 1688 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list. 1689 */ 1690 if (sfp->low_dma) 1691 gfp_flags |= GFP_DMA; 1692 schp->buffer = kzalloc(sg_bufflen, gfp_flags); 1693 if (!schp->buffer) 1694 return -ENOMEM; 1695 schp->sglist_len = sg_bufflen; 1696 return tablesize; /* number of scat_gath elements allocated */ 1697 } 1698 1699 #ifdef SG_ALLOW_DIO_CODE 1700 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ 1701 /* TODO: hopefully we can use the generic block layer code */ 1702 1703 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if 1704 - mapping of all pages not successful 1705 (i.e., either completely successful or fails) 1706 */ 1707 static int 1708 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, 1709 unsigned long uaddr, size_t count, int rw) 1710 { 1711 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 1712 unsigned long start = uaddr >> PAGE_SHIFT; 1713 const int nr_pages = end - start; 1714 int res, i, j; 1715 struct page **pages; 1716 1717 /* User attempted Overflow! */ 1718 if ((uaddr + count) < uaddr) 1719 return -EINVAL; 1720 1721 /* Too big */ 1722 if (nr_pages > max_pages) 1723 return -ENOMEM; 1724 1725 /* Hmm? */ 1726 if (count == 0) 1727 return 0; 1728 1729 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) 1730 return -ENOMEM; 1731 1732 /* Try to fault in all of the necessary pages */ 1733 down_read(¤t->mm->mmap_sem); 1734 /* rw==READ means read from drive, write into memory area */ 1735 res = get_user_pages( 1736 current, 1737 current->mm, 1738 uaddr, 1739 nr_pages, 1740 rw == READ, 1741 0, /* don't force */ 1742 pages, 1743 NULL); 1744 up_read(¤t->mm->mmap_sem); 1745 1746 /* Errors and no page mapped should return here */ 1747 if (res < nr_pages) 1748 goto out_unmap; 1749 1750 for (i=0; i < nr_pages; i++) { 1751 /* FIXME: flush superflous for rw==READ, 1752 * probably wrong function for rw==WRITE 1753 */ 1754 flush_dcache_page(pages[i]); 1755 /* ?? Is locking needed? I don't think so */ 1756 /* if (TestSetPageLocked(pages[i])) 1757 goto out_unlock; */ 1758 } 1759 1760 sgl[0].page = pages[0]; 1761 sgl[0].offset = uaddr & ~PAGE_MASK; 1762 if (nr_pages > 1) { 1763 sgl[0].length = PAGE_SIZE - sgl[0].offset; 1764 count -= sgl[0].length; 1765 for (i=1; i < nr_pages ; i++) { 1766 sgl[i].page = pages[i]; 1767 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; 1768 count -= PAGE_SIZE; 1769 } 1770 } 1771 else { 1772 sgl[0].length = count; 1773 } 1774 1775 kfree(pages); 1776 return nr_pages; 1777 1778 out_unmap: 1779 if (res > 0) { 1780 for (j=0; j < res; j++) 1781 page_cache_release(pages[j]); 1782 res = 0; 1783 } 1784 kfree(pages); 1785 return res; 1786 } 1787 1788 1789 /* And unmap them... */ 1790 static int 1791 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, 1792 int dirtied) 1793 { 1794 int i; 1795 1796 for (i=0; i < nr_pages; i++) { 1797 struct page *page = sgl[i].page; 1798 1799 if (dirtied) 1800 SetPageDirty(page); 1801 /* unlock_page(page); */ 1802 /* FIXME: cache flush missing for rw==READ 1803 * FIXME: call the correct reference counting function 1804 */ 1805 page_cache_release(page); 1806 } 1807 1808 return 0; 1809 } 1810 1811 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ 1812 #endif 1813 1814 1815 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ 1816 static int 1817 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) 1818 { 1819 #ifdef SG_ALLOW_DIO_CODE 1820 sg_io_hdr_t *hp = &srp->header; 1821 Sg_scatter_hold *schp = &srp->data; 1822 int sg_tablesize = sfp->parentdp->sg_tablesize; 1823 int mx_sc_elems, res; 1824 struct scsi_device *sdev = sfp->parentdp->device; 1825 1826 if (((unsigned long)hp->dxferp & 1827 queue_dma_alignment(sdev->request_queue)) != 0) 1828 return 1; 1829 1830 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1831 if (mx_sc_elems <= 0) { 1832 return 1; 1833 } 1834 res = st_map_user_pages(schp->buffer, mx_sc_elems, 1835 (unsigned long)hp->dxferp, dxfer_len, 1836 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0); 1837 if (res <= 0) 1838 return 1; 1839 schp->k_use_sg = res; 1840 schp->dio_in_use = 1; 1841 hp->info |= SG_INFO_DIRECT_IO; 1842 return 0; 1843 #else 1844 return 1; 1845 #endif 1846 } 1847 1848 static int 1849 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1850 { 1851 struct scatterlist *sg; 1852 int ret_sz = 0, k, rem_sz, num, mx_sc_elems; 1853 int sg_tablesize = sfp->parentdp->sg_tablesize; 1854 int blk_size = buff_size; 1855 struct page *p = NULL; 1856 1857 if ((blk_size < 0) || (!sfp)) 1858 return -EFAULT; 1859 if (0 == blk_size) 1860 ++blk_size; /* don't know why */ 1861 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1862 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); 1863 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1864 buff_size, blk_size)); 1865 1866 /* N.B. ret_sz carried into this block ... */ 1867 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1868 if (mx_sc_elems < 0) 1869 return mx_sc_elems; /* most likely -ENOMEM */ 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) { 1874 1875 num = (rem_sz > SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz; 1876 p = sg_page_malloc(num, sfp->low_dma, &ret_sz); 1877 if (!p) 1878 return -ENOMEM; 1879 1880 sg->page = p; 1881 sg->length = ret_sz; 1882 1883 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n", 1884 k, p, ret_sz)); 1885 } /* end of for loop */ 1886 1887 schp->k_use_sg = k; 1888 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz)); 1889 1890 schp->bufflen = blk_size; 1891 if (rem_sz > 0) /* must have failed */ 1892 return -ENOMEM; 1893 1894 return 0; 1895 } 1896 1897 static int 1898 sg_write_xfer(Sg_request * srp) 1899 { 1900 sg_io_hdr_t *hp = &srp->header; 1901 Sg_scatter_hold *schp = &srp->data; 1902 struct scatterlist *sg = schp->buffer; 1903 int num_xfer = 0; 1904 int j, k, onum, usglen, ksglen, res; 1905 int iovec_count = (int) hp->iovec_count; 1906 int dxfer_dir = hp->dxfer_direction; 1907 unsigned char *p; 1908 unsigned char __user *up; 1909 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 1910 1911 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || 1912 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 1913 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); 1914 if (schp->bufflen < num_xfer) 1915 num_xfer = schp->bufflen; 1916 } 1917 if ((num_xfer <= 0) || (schp->dio_in_use) || 1918 (new_interface 1919 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 1920 return 0; 1921 1922 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 1923 num_xfer, iovec_count, schp->k_use_sg)); 1924 if (iovec_count) { 1925 onum = iovec_count; 1926 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 1927 return -EFAULT; 1928 } else 1929 onum = 1; 1930 1931 ksglen = sg->length; 1932 p = page_address(sg->page); 1933 for (j = 0, k = 0; j < onum; ++j) { 1934 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); 1935 if (res) 1936 return res; 1937 1938 for (; p; ++sg, ksglen = sg->length, 1939 p = page_address(sg->page)) { 1940 if (usglen <= 0) 1941 break; 1942 if (ksglen > usglen) { 1943 if (usglen >= num_xfer) { 1944 if (__copy_from_user(p, up, num_xfer)) 1945 return -EFAULT; 1946 return 0; 1947 } 1948 if (__copy_from_user(p, up, usglen)) 1949 return -EFAULT; 1950 p += usglen; 1951 ksglen -= usglen; 1952 break; 1953 } else { 1954 if (ksglen >= num_xfer) { 1955 if (__copy_from_user(p, up, num_xfer)) 1956 return -EFAULT; 1957 return 0; 1958 } 1959 if (__copy_from_user(p, up, ksglen)) 1960 return -EFAULT; 1961 up += ksglen; 1962 usglen -= ksglen; 1963 } 1964 ++k; 1965 if (k >= schp->k_use_sg) 1966 return 0; 1967 } 1968 } 1969 1970 return 0; 1971 } 1972 1973 static int 1974 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 1975 int wr_xf, int *countp, unsigned char __user **up) 1976 { 1977 int num_xfer = (int) hp->dxfer_len; 1978 unsigned char __user *p = hp->dxferp; 1979 int count; 1980 1981 if (0 == sg_num) { 1982 if (wr_xf && ('\0' == hp->interface_id)) 1983 count = (int) hp->flags; /* holds "old" input_size */ 1984 else 1985 count = num_xfer; 1986 } else { 1987 sg_iovec_t iovec; 1988 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) 1989 return -EFAULT; 1990 p = iovec.iov_base; 1991 count = (int) iovec.iov_len; 1992 } 1993 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) 1994 return -EFAULT; 1995 if (up) 1996 *up = p; 1997 if (countp) 1998 *countp = count; 1999 return 0; 2000 } 2001 2002 static void 2003 sg_remove_scat(Sg_scatter_hold * schp) 2004 { 2005 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 2006 if (schp->buffer && (schp->sglist_len > 0)) { 2007 struct scatterlist *sg = schp->buffer; 2008 2009 if (schp->dio_in_use) { 2010 #ifdef SG_ALLOW_DIO_CODE 2011 st_unmap_user_pages(sg, schp->k_use_sg, TRUE); 2012 #endif 2013 } else { 2014 int k; 2015 2016 for (k = 0; (k < schp->k_use_sg) && sg->page; 2017 ++k, ++sg) { 2018 SCSI_LOG_TIMEOUT(5, printk( 2019 "sg_remove_scat: k=%d, a=0x%p, len=%d\n", 2020 k, sg->page, sg->length)); 2021 sg_page_free(sg->page, sg->length); 2022 } 2023 } 2024 kfree(schp->buffer); 2025 } 2026 memset(schp, 0, sizeof (*schp)); 2027 } 2028 2029 static int 2030 sg_read_xfer(Sg_request * srp) 2031 { 2032 sg_io_hdr_t *hp = &srp->header; 2033 Sg_scatter_hold *schp = &srp->data; 2034 struct scatterlist *sg = schp->buffer; 2035 int num_xfer = 0; 2036 int j, k, onum, usglen, ksglen, res; 2037 int iovec_count = (int) hp->iovec_count; 2038 int dxfer_dir = hp->dxfer_direction; 2039 unsigned char *p; 2040 unsigned char __user *up; 2041 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 2042 2043 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) 2044 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 2045 num_xfer = hp->dxfer_len; 2046 if (schp->bufflen < num_xfer) 2047 num_xfer = schp->bufflen; 2048 } 2049 if ((num_xfer <= 0) || (schp->dio_in_use) || 2050 (new_interface 2051 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 2052 return 0; 2053 2054 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 2055 num_xfer, iovec_count, schp->k_use_sg)); 2056 if (iovec_count) { 2057 onum = iovec_count; 2058 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 2059 return -EFAULT; 2060 } else 2061 onum = 1; 2062 2063 p = page_address(sg->page); 2064 ksglen = sg->length; 2065 for (j = 0, k = 0; j < onum; ++j) { 2066 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); 2067 if (res) 2068 return res; 2069 2070 for (; p; ++sg, ksglen = sg->length, 2071 p = page_address(sg->page)) { 2072 if (usglen <= 0) 2073 break; 2074 if (ksglen > usglen) { 2075 if (usglen >= num_xfer) { 2076 if (__copy_to_user(up, p, num_xfer)) 2077 return -EFAULT; 2078 return 0; 2079 } 2080 if (__copy_to_user(up, p, usglen)) 2081 return -EFAULT; 2082 p += usglen; 2083 ksglen -= usglen; 2084 break; 2085 } else { 2086 if (ksglen >= num_xfer) { 2087 if (__copy_to_user(up, p, num_xfer)) 2088 return -EFAULT; 2089 return 0; 2090 } 2091 if (__copy_to_user(up, p, ksglen)) 2092 return -EFAULT; 2093 up += ksglen; 2094 usglen -= ksglen; 2095 } 2096 ++k; 2097 if (k >= schp->k_use_sg) 2098 return 0; 2099 } 2100 } 2101 2102 return 0; 2103 } 2104 2105 static int 2106 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 2107 { 2108 Sg_scatter_hold *schp = &srp->data; 2109 struct scatterlist *sg = schp->buffer; 2110 int k, num; 2111 2112 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 2113 num_read_xfer)); 2114 if ((!outp) || (num_read_xfer <= 0)) 2115 return 0; 2116 2117 for (k = 0; (k < schp->k_use_sg) && sg->page; ++k, ++sg) { 2118 num = sg->length; 2119 if (num > num_read_xfer) { 2120 if (__copy_to_user(outp, page_address(sg->page), 2121 num_read_xfer)) 2122 return -EFAULT; 2123 break; 2124 } else { 2125 if (__copy_to_user(outp, page_address(sg->page), 2126 num)) 2127 return -EFAULT; 2128 num_read_xfer -= num; 2129 if (num_read_xfer <= 0) 2130 break; 2131 outp += num; 2132 } 2133 } 2134 2135 return 0; 2136 } 2137 2138 static void 2139 sg_build_reserve(Sg_fd * sfp, int req_size) 2140 { 2141 Sg_scatter_hold *schp = &sfp->reserve; 2142 2143 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 2144 do { 2145 if (req_size < PAGE_SIZE) 2146 req_size = PAGE_SIZE; 2147 if (0 == sg_build_indirect(schp, sfp, req_size)) 2148 return; 2149 else 2150 sg_remove_scat(schp); 2151 req_size >>= 1; /* divide by 2 */ 2152 } while (req_size > (PAGE_SIZE / 2)); 2153 } 2154 2155 static void 2156 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 2157 { 2158 Sg_scatter_hold *req_schp = &srp->data; 2159 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2160 struct scatterlist *sg = rsv_schp->buffer; 2161 int k, num, rem; 2162 2163 srp->res_used = 1; 2164 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 2165 rem = size; 2166 2167 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sg) { 2168 num = sg->length; 2169 if (rem <= num) { 2170 sfp->save_scat_len = num; 2171 sg->length = rem; 2172 req_schp->k_use_sg = k + 1; 2173 req_schp->sglist_len = rsv_schp->sglist_len; 2174 req_schp->buffer = rsv_schp->buffer; 2175 2176 req_schp->bufflen = size; 2177 req_schp->b_malloc_len = rsv_schp->b_malloc_len; 2178 break; 2179 } else 2180 rem -= num; 2181 } 2182 2183 if (k >= rsv_schp->k_use_sg) 2184 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 2185 } 2186 2187 static void 2188 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 2189 { 2190 Sg_scatter_hold *req_schp = &srp->data; 2191 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2192 2193 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 2194 (int) req_schp->k_use_sg)); 2195 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { 2196 struct scatterlist *sg = rsv_schp->buffer; 2197 2198 if (sfp->save_scat_len > 0) 2199 (sg + (req_schp->k_use_sg - 1))->length = 2200 (unsigned) sfp->save_scat_len; 2201 else 2202 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); 2203 } 2204 req_schp->k_use_sg = 0; 2205 req_schp->bufflen = 0; 2206 req_schp->buffer = NULL; 2207 req_schp->sglist_len = 0; 2208 sfp->save_scat_len = 0; 2209 srp->res_used = 0; 2210 } 2211 2212 static Sg_request * 2213 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 2214 { 2215 Sg_request *resp; 2216 unsigned long iflags; 2217 2218 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2219 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 2220 /* look for requests that are ready + not SG_IO owned */ 2221 if ((1 == resp->done) && (!resp->sg_io_owned) && 2222 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 2223 resp->done = 2; /* guard against other readers */ 2224 break; 2225 } 2226 } 2227 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2228 return resp; 2229 } 2230 2231 #ifdef CONFIG_SCSI_PROC_FS 2232 static Sg_request * 2233 sg_get_nth_request(Sg_fd * sfp, int nth) 2234 { 2235 Sg_request *resp; 2236 unsigned long iflags; 2237 int k; 2238 2239 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2240 for (k = 0, resp = sfp->headrp; resp && (k < nth); 2241 ++k, resp = resp->nextrp) ; 2242 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2243 return resp; 2244 } 2245 #endif 2246 2247 /* always adds to end of list */ 2248 static Sg_request * 2249 sg_add_request(Sg_fd * sfp) 2250 { 2251 int k; 2252 unsigned long iflags; 2253 Sg_request *resp; 2254 Sg_request *rp = sfp->req_arr; 2255 2256 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2257 resp = sfp->headrp; 2258 if (!resp) { 2259 memset(rp, 0, sizeof (Sg_request)); 2260 rp->parentfp = sfp; 2261 resp = rp; 2262 sfp->headrp = resp; 2263 } else { 2264 if (0 == sfp->cmd_q) 2265 resp = NULL; /* command queuing disallowed */ 2266 else { 2267 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2268 if (!rp->parentfp) 2269 break; 2270 } 2271 if (k < SG_MAX_QUEUE) { 2272 memset(rp, 0, sizeof (Sg_request)); 2273 rp->parentfp = sfp; 2274 while (resp->nextrp) 2275 resp = resp->nextrp; 2276 resp->nextrp = rp; 2277 resp = rp; 2278 } else 2279 resp = NULL; 2280 } 2281 } 2282 if (resp) { 2283 resp->nextrp = NULL; 2284 resp->header.duration = jiffies_to_msecs(jiffies); 2285 } 2286 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2287 return resp; 2288 } 2289 2290 /* Return of 1 for found; 0 for not found */ 2291 static int 2292 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2293 { 2294 Sg_request *prev_rp; 2295 Sg_request *rp; 2296 unsigned long iflags; 2297 int res = 0; 2298 2299 if ((!sfp) || (!srp) || (!sfp->headrp)) 2300 return res; 2301 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2302 prev_rp = sfp->headrp; 2303 if (srp == prev_rp) { 2304 sfp->headrp = prev_rp->nextrp; 2305 prev_rp->parentfp = NULL; 2306 res = 1; 2307 } else { 2308 while ((rp = prev_rp->nextrp)) { 2309 if (srp == rp) { 2310 prev_rp->nextrp = rp->nextrp; 2311 rp->parentfp = NULL; 2312 res = 1; 2313 break; 2314 } 2315 prev_rp = rp; 2316 } 2317 } 2318 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2319 return res; 2320 } 2321 2322 #ifdef CONFIG_SCSI_PROC_FS 2323 static Sg_fd * 2324 sg_get_nth_sfp(Sg_device * sdp, int nth) 2325 { 2326 Sg_fd *resp; 2327 unsigned long iflags; 2328 int k; 2329 2330 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2331 for (k = 0, resp = sdp->headfp; resp && (k < nth); 2332 ++k, resp = resp->nextfp) ; 2333 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2334 return resp; 2335 } 2336 #endif 2337 2338 static Sg_fd * 2339 sg_add_sfp(Sg_device * sdp, int dev) 2340 { 2341 Sg_fd *sfp; 2342 unsigned long iflags; 2343 2344 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2345 if (!sfp) 2346 return NULL; 2347 2348 init_waitqueue_head(&sfp->read_wait); 2349 rwlock_init(&sfp->rq_list_lock); 2350 2351 sfp->timeout = SG_DEFAULT_TIMEOUT; 2352 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2353 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2354 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2355 sdp->device->host->unchecked_isa_dma : 1; 2356 sfp->cmd_q = SG_DEF_COMMAND_Q; 2357 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2358 sfp->parentdp = sdp; 2359 write_lock_irqsave(&sg_dev_arr_lock, iflags); 2360 if (!sdp->headfp) 2361 sdp->headfp = sfp; 2362 else { /* add to tail of existing list */ 2363 Sg_fd *pfp = sdp->headfp; 2364 while (pfp->nextfp) 2365 pfp = pfp->nextfp; 2366 pfp->nextfp = sfp; 2367 } 2368 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2369 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2370 sg_build_reserve(sfp, sg_big_buff); 2371 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2372 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2373 return sfp; 2374 } 2375 2376 static void 2377 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2378 { 2379 Sg_fd *fp; 2380 Sg_fd *prev_fp; 2381 2382 prev_fp = sdp->headfp; 2383 if (sfp == prev_fp) 2384 sdp->headfp = prev_fp->nextfp; 2385 else { 2386 while ((fp = prev_fp->nextfp)) { 2387 if (sfp == fp) { 2388 prev_fp->nextfp = fp->nextfp; 2389 break; 2390 } 2391 prev_fp = fp; 2392 } 2393 } 2394 if (sfp->reserve.bufflen > 0) { 2395 SCSI_LOG_TIMEOUT(6, 2396 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2397 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); 2398 if (sfp->mmap_called) 2399 sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */ 2400 sg_remove_scat(&sfp->reserve); 2401 } 2402 sfp->parentdp = NULL; 2403 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); 2404 kfree(sfp); 2405 } 2406 2407 /* Returns 0 in normal case, 1 when detached and sdp object removed */ 2408 static int 2409 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2410 { 2411 Sg_request *srp; 2412 Sg_request *tsrp; 2413 int dirty = 0; 2414 int res = 0; 2415 2416 for (srp = sfp->headrp; srp; srp = tsrp) { 2417 tsrp = srp->nextrp; 2418 if (sg_srp_done(srp, sfp)) 2419 sg_finish_rem_req(srp); 2420 else 2421 ++dirty; 2422 } 2423 if (0 == dirty) { 2424 unsigned long iflags; 2425 2426 write_lock_irqsave(&sg_dev_arr_lock, iflags); 2427 __sg_remove_sfp(sdp, sfp); 2428 if (sdp->detached && (NULL == sdp->headfp)) { 2429 int k, maxd; 2430 2431 maxd = sg_dev_max; 2432 for (k = 0; k < maxd; ++k) { 2433 if (sdp == sg_dev_arr[k]) 2434 break; 2435 } 2436 if (k < maxd) 2437 sg_dev_arr[k] = NULL; 2438 kfree((char *) sdp); 2439 res = 1; 2440 } 2441 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2442 } else { 2443 /* MOD_INC's to inhibit unloading sg and associated adapter driver */ 2444 /* only bump the access_count if we actually succeeded in 2445 * throwing another counter on the host module */ 2446 scsi_device_get(sdp->device); /* XXX: retval ignored? */ 2447 sfp->closed = 1; /* flag dirty state on this fd */ 2448 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", 2449 dirty)); 2450 } 2451 return res; 2452 } 2453 2454 static int 2455 sg_res_in_use(Sg_fd * sfp) 2456 { 2457 const Sg_request *srp; 2458 unsigned long iflags; 2459 2460 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2461 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2462 if (srp->res_used) 2463 break; 2464 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2465 return srp ? 1 : 0; 2466 } 2467 2468 /* If retSzp==NULL want exact size or fail */ 2469 static struct page * 2470 sg_page_malloc(int rqSz, int lowDma, int *retSzp) 2471 { 2472 struct page *resp = NULL; 2473 gfp_t page_mask; 2474 int order, a_size; 2475 int resSz = rqSz; 2476 2477 if (rqSz <= 0) 2478 return resp; 2479 2480 if (lowDma) 2481 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN; 2482 else 2483 page_mask = GFP_ATOMIC | __GFP_NOWARN; 2484 2485 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; 2486 order++, a_size <<= 1) ; 2487 resp = alloc_pages(page_mask, order); 2488 while ((!resp) && order && retSzp) { 2489 --order; 2490 a_size >>= 1; /* divide by 2, until PAGE_SIZE */ 2491 resp = alloc_pages(page_mask, order); /* try half */ 2492 resSz = a_size; 2493 } 2494 if (resp) { 2495 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2496 memset(page_address(resp), 0, resSz); 2497 if (retSzp) 2498 *retSzp = resSz; 2499 } 2500 return resp; 2501 } 2502 2503 static void 2504 sg_page_free(struct page *page, int size) 2505 { 2506 int order, a_size; 2507 2508 if (!page) 2509 return; 2510 for (order = 0, a_size = PAGE_SIZE; a_size < size; 2511 order++, a_size <<= 1) ; 2512 __free_pages(page, order); 2513 } 2514 2515 #ifndef MAINTENANCE_IN_CMD 2516 #define MAINTENANCE_IN_CMD 0xa3 2517 #endif 2518 2519 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, 2520 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, 2521 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, 2522 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD 2523 }; 2524 2525 static int 2526 sg_allow_access(unsigned char opcode, char dev_type) 2527 { 2528 int k; 2529 2530 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */ 2531 return 1; 2532 for (k = 0; k < sizeof (allow_ops); ++k) { 2533 if (opcode == allow_ops[k]) 2534 return 1; 2535 } 2536 return 0; 2537 } 2538 2539 #ifdef CONFIG_SCSI_PROC_FS 2540 static int 2541 sg_last_dev(void) 2542 { 2543 int k; 2544 unsigned long iflags; 2545 2546 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2547 for (k = sg_dev_max - 1; k >= 0; --k) 2548 if (sg_dev_arr[k] && sg_dev_arr[k]->device) 2549 break; 2550 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2551 return k + 1; /* origin 1 */ 2552 } 2553 #endif 2554 2555 static Sg_device * 2556 sg_get_dev(int dev) 2557 { 2558 Sg_device *sdp = NULL; 2559 unsigned long iflags; 2560 2561 if (sg_dev_arr && (dev >= 0)) { 2562 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2563 if (dev < sg_dev_max) 2564 sdp = sg_dev_arr[dev]; 2565 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2566 } 2567 return sdp; 2568 } 2569 2570 #ifdef CONFIG_SCSI_PROC_FS 2571 2572 static struct proc_dir_entry *sg_proc_sgp = NULL; 2573 2574 static char sg_proc_sg_dirname[] = "scsi/sg"; 2575 2576 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2577 2578 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2579 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2580 size_t count, loff_t *off); 2581 static struct file_operations adio_fops = { 2582 /* .owner, .read and .llseek added in sg_proc_init() */ 2583 .open = sg_proc_single_open_adio, 2584 .write = sg_proc_write_adio, 2585 .release = single_release, 2586 }; 2587 2588 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2589 static ssize_t sg_proc_write_dressz(struct file *filp, 2590 const char __user *buffer, size_t count, loff_t *off); 2591 static struct file_operations dressz_fops = { 2592 .open = sg_proc_single_open_dressz, 2593 .write = sg_proc_write_dressz, 2594 .release = single_release, 2595 }; 2596 2597 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2598 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2599 static struct file_operations version_fops = { 2600 .open = sg_proc_single_open_version, 2601 .release = single_release, 2602 }; 2603 2604 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2605 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2606 static struct file_operations devhdr_fops = { 2607 .open = sg_proc_single_open_devhdr, 2608 .release = single_release, 2609 }; 2610 2611 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2612 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2613 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2614 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2615 static void dev_seq_stop(struct seq_file *s, void *v); 2616 static struct file_operations dev_fops = { 2617 .open = sg_proc_open_dev, 2618 .release = seq_release, 2619 }; 2620 static struct seq_operations dev_seq_ops = { 2621 .start = dev_seq_start, 2622 .next = dev_seq_next, 2623 .stop = dev_seq_stop, 2624 .show = sg_proc_seq_show_dev, 2625 }; 2626 2627 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2628 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2629 static struct file_operations devstrs_fops = { 2630 .open = sg_proc_open_devstrs, 2631 .release = seq_release, 2632 }; 2633 static struct seq_operations devstrs_seq_ops = { 2634 .start = dev_seq_start, 2635 .next = dev_seq_next, 2636 .stop = dev_seq_stop, 2637 .show = sg_proc_seq_show_devstrs, 2638 }; 2639 2640 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2641 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2642 static struct file_operations debug_fops = { 2643 .open = sg_proc_open_debug, 2644 .release = seq_release, 2645 }; 2646 static struct seq_operations debug_seq_ops = { 2647 .start = dev_seq_start, 2648 .next = dev_seq_next, 2649 .stop = dev_seq_stop, 2650 .show = sg_proc_seq_show_debug, 2651 }; 2652 2653 2654 struct sg_proc_leaf { 2655 const char * name; 2656 struct file_operations * fops; 2657 }; 2658 2659 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2660 {"allow_dio", &adio_fops}, 2661 {"debug", &debug_fops}, 2662 {"def_reserved_size", &dressz_fops}, 2663 {"device_hdr", &devhdr_fops}, 2664 {"devices", &dev_fops}, 2665 {"device_strs", &devstrs_fops}, 2666 {"version", &version_fops} 2667 }; 2668 2669 static int 2670 sg_proc_init(void) 2671 { 2672 int k, mask; 2673 int num_leaves = 2674 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); 2675 struct proc_dir_entry *pdep; 2676 struct sg_proc_leaf * leaf; 2677 2678 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2679 if (!sg_proc_sgp) 2680 return 1; 2681 for (k = 0; k < num_leaves; ++k) { 2682 leaf = &sg_proc_leaf_arr[k]; 2683 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2684 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp); 2685 if (pdep) { 2686 leaf->fops->owner = THIS_MODULE, 2687 leaf->fops->read = seq_read, 2688 leaf->fops->llseek = seq_lseek, 2689 pdep->proc_fops = leaf->fops; 2690 } 2691 } 2692 return 0; 2693 } 2694 2695 static void 2696 sg_proc_cleanup(void) 2697 { 2698 int k; 2699 int num_leaves = 2700 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); 2701 2702 if (!sg_proc_sgp) 2703 return; 2704 for (k = 0; k < num_leaves; ++k) 2705 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2706 remove_proc_entry(sg_proc_sg_dirname, NULL); 2707 } 2708 2709 2710 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2711 { 2712 seq_printf(s, "%d\n", *((int *)s->private)); 2713 return 0; 2714 } 2715 2716 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2717 { 2718 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2719 } 2720 2721 static ssize_t 2722 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2723 size_t count, loff_t *off) 2724 { 2725 int num; 2726 char buff[11]; 2727 2728 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2729 return -EACCES; 2730 num = (count < 10) ? count : 10; 2731 if (copy_from_user(buff, buffer, num)) 2732 return -EFAULT; 2733 buff[num] = '\0'; 2734 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2735 return count; 2736 } 2737 2738 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2739 { 2740 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2741 } 2742 2743 static ssize_t 2744 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2745 size_t count, loff_t *off) 2746 { 2747 int num; 2748 unsigned long k = ULONG_MAX; 2749 char buff[11]; 2750 2751 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2752 return -EACCES; 2753 num = (count < 10) ? count : 10; 2754 if (copy_from_user(buff, buffer, num)) 2755 return -EFAULT; 2756 buff[num] = '\0'; 2757 k = simple_strtoul(buff, NULL, 10); 2758 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2759 sg_big_buff = k; 2760 return count; 2761 } 2762 return -ERANGE; 2763 } 2764 2765 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2766 { 2767 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2768 sg_version_date); 2769 return 0; 2770 } 2771 2772 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2773 { 2774 return single_open(file, sg_proc_seq_show_version, NULL); 2775 } 2776 2777 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2778 { 2779 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2780 "online\n"); 2781 return 0; 2782 } 2783 2784 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2785 { 2786 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2787 } 2788 2789 struct sg_proc_deviter { 2790 loff_t index; 2791 size_t max; 2792 }; 2793 2794 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2795 { 2796 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2797 2798 s->private = it; 2799 if (! it) 2800 return NULL; 2801 2802 if (NULL == sg_dev_arr) 2803 return NULL; 2804 it->index = *pos; 2805 it->max = sg_last_dev(); 2806 if (it->index >= it->max) 2807 return NULL; 2808 return it; 2809 } 2810 2811 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2812 { 2813 struct sg_proc_deviter * it = s->private; 2814 2815 *pos = ++it->index; 2816 return (it->index < it->max) ? it : NULL; 2817 } 2818 2819 static void dev_seq_stop(struct seq_file *s, void *v) 2820 { 2821 kfree(s->private); 2822 } 2823 2824 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2825 { 2826 return seq_open(file, &dev_seq_ops); 2827 } 2828 2829 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2830 { 2831 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2832 Sg_device *sdp; 2833 struct scsi_device *scsidp; 2834 2835 sdp = it ? sg_get_dev(it->index) : NULL; 2836 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2837 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2838 scsidp->host->host_no, scsidp->channel, 2839 scsidp->id, scsidp->lun, (int) scsidp->type, 2840 1, 2841 (int) scsidp->queue_depth, 2842 (int) scsidp->device_busy, 2843 (int) scsi_device_online(scsidp)); 2844 else 2845 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2846 return 0; 2847 } 2848 2849 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2850 { 2851 return seq_open(file, &devstrs_seq_ops); 2852 } 2853 2854 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2855 { 2856 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2857 Sg_device *sdp; 2858 struct scsi_device *scsidp; 2859 2860 sdp = it ? sg_get_dev(it->index) : NULL; 2861 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2862 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2863 scsidp->vendor, scsidp->model, scsidp->rev); 2864 else 2865 seq_printf(s, "<no active device>\n"); 2866 return 0; 2867 } 2868 2869 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2870 { 2871 int k, m, new_interface, blen, usg; 2872 Sg_request *srp; 2873 Sg_fd *fp; 2874 const sg_io_hdr_t *hp; 2875 const char * cp; 2876 unsigned int ms; 2877 2878 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { 2879 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2880 "(res)sgat=%d low_dma=%d\n", k + 1, 2881 jiffies_to_msecs(fp->timeout), 2882 fp->reserve.bufflen, 2883 (int) fp->reserve.k_use_sg, 2884 (int) fp->low_dma); 2885 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2886 (int) fp->cmd_q, (int) fp->force_packid, 2887 (int) fp->keep_orphan, (int) fp->closed); 2888 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { 2889 hp = &srp->header; 2890 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2891 if (srp->res_used) { 2892 if (new_interface && 2893 (SG_FLAG_MMAP_IO & hp->flags)) 2894 cp = " mmap>> "; 2895 else 2896 cp = " rb>> "; 2897 } else { 2898 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2899 cp = " dio>> "; 2900 else 2901 cp = " "; 2902 } 2903 seq_printf(s, cp); 2904 blen = srp->data.bufflen; 2905 usg = srp->data.k_use_sg; 2906 seq_printf(s, srp->done ? 2907 ((1 == srp->done) ? "rcv:" : "fin:") 2908 : "act:"); 2909 seq_printf(s, " id=%d blen=%d", 2910 srp->header.pack_id, blen); 2911 if (srp->done) 2912 seq_printf(s, " dur=%d", hp->duration); 2913 else { 2914 ms = jiffies_to_msecs(jiffies); 2915 seq_printf(s, " t_o/elap=%d/%d", 2916 (new_interface ? hp->timeout : 2917 jiffies_to_msecs(fp->timeout)), 2918 (ms > hp->duration ? ms - hp->duration : 0)); 2919 } 2920 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2921 (int) srp->data.cmd_opcode); 2922 } 2923 if (0 == m) 2924 seq_printf(s, " No requests active\n"); 2925 } 2926 } 2927 2928 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2929 { 2930 return seq_open(file, &debug_seq_ops); 2931 } 2932 2933 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2934 { 2935 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2936 Sg_device *sdp; 2937 2938 if (it && (0 == it->index)) { 2939 seq_printf(s, "dev_max(currently)=%d max_active_device=%d " 2940 "(origin 1)\n", sg_dev_max, (int)it->max); 2941 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2942 } 2943 sdp = it ? sg_get_dev(it->index) : NULL; 2944 if (sdp) { 2945 struct scsi_device *scsidp = sdp->device; 2946 2947 if (NULL == scsidp) { 2948 seq_printf(s, "device %d detached ??\n", 2949 (int)it->index); 2950 return 0; 2951 } 2952 2953 if (sg_get_nth_sfp(sdp, 0)) { 2954 seq_printf(s, " >>> device=%s ", 2955 sdp->disk->disk_name); 2956 if (sdp->detached) 2957 seq_printf(s, "detached pending close "); 2958 else 2959 seq_printf 2960 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2961 scsidp->host->host_no, 2962 scsidp->channel, scsidp->id, 2963 scsidp->lun, 2964 scsidp->host->hostt->emulated); 2965 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2966 sdp->sg_tablesize, sdp->exclude); 2967 } 2968 sg_proc_debug_helper(s, sdp); 2969 } 2970 return 0; 2971 } 2972 2973 #endif /* CONFIG_SCSI_PROC_FS */ 2974 2975 module_init(init_sg); 2976 module_exit(exit_sg); 2977 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 2978