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 53 #include "scsi.h" 54 #include <scsi/scsi_dbg.h> 55 #include <scsi/scsi_host.h> 56 #include <scsi/scsi_driver.h> 57 #include <scsi/scsi_ioctl.h> 58 #include <scsi/sg.h> 59 60 #include "scsi_logging.h" 61 62 #ifdef CONFIG_SCSI_PROC_FS 63 #include <linux/proc_fs.h> 64 static char *sg_version_date = "20050328"; 65 66 static int sg_proc_init(void); 67 static void sg_proc_cleanup(void); 68 #endif 69 70 #ifndef LINUX_VERSION_CODE 71 #include <linux/version.h> 72 #endif /* LINUX_VERSION_CODE */ 73 74 #define SG_ALLOW_DIO_DEF 0 75 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */ 76 77 #define SG_MAX_DEVS 32768 78 79 /* 80 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 81 * Then when using 32 bit integers x * m may overflow during the calculation. 82 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 83 * calculates the same, but prevents the overflow when both m and d 84 * are "small" numbers (like HZ and USER_HZ). 85 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 86 * in 32 bits. 87 */ 88 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 89 90 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 91 92 int sg_big_buff = SG_DEF_RESERVED_SIZE; 93 /* N.B. This variable is readable and writeable via 94 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 95 of this size (or less if there is not enough memory) will be reserved 96 for use by this file descriptor. [Deprecated usage: this variable is also 97 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 98 the kernel (i.e. it is not a module).] */ 99 static int def_reserved_size = -1; /* picks up init parameter */ 100 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 101 102 #define SG_SECTOR_SZ 512 103 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) 104 105 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */ 106 107 static int sg_add(struct class_device *); 108 static void sg_remove(struct class_device *); 109 110 static Scsi_Request *dummy_cmdp; /* only used for sizeof */ 111 112 static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock 113 file descriptor list for device */ 114 115 static struct class_interface sg_interface = { 116 .add = sg_add, 117 .remove = sg_remove, 118 }; 119 120 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 121 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 122 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */ 123 unsigned bufflen; /* Size of (aggregate) data buffer */ 124 unsigned b_malloc_len; /* actual len malloc'ed in buffer */ 125 void *buffer; /* Data buffer or scatter list (k_use_sg>0) */ 126 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 127 unsigned char cmd_opcode; /* first byte of command */ 128 } Sg_scatter_hold; 129 130 struct sg_device; /* forward declarations */ 131 struct sg_fd; 132 133 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 134 Scsi_Request *my_cmdp; /* != 0 when request with lower levels */ 135 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 136 struct sg_fd *parentfp; /* NULL -> not in use */ 137 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 138 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 139 unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)]; 140 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 141 char orphan; /* 1 -> drop on sight, 0 -> normal */ 142 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 143 volatile char done; /* 0->before bh, 1->before read, 2->read */ 144 } Sg_request; 145 146 typedef struct sg_fd { /* holds the state of a file descriptor */ 147 struct sg_fd *nextfp; /* NULL when last opened fd on this device */ 148 struct sg_device *parentdp; /* owning device */ 149 wait_queue_head_t read_wait; /* queue read until command done */ 150 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 151 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 152 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 153 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 154 unsigned save_scat_len; /* original length of trunc. scat. element */ 155 Sg_request *headrp; /* head of request slist, NULL->empty */ 156 struct fasync_struct *async_qp; /* used by asynchronous notification */ 157 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 158 char low_dma; /* as in parent but possibly overridden to 1 */ 159 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 160 volatile char closed; /* 1 -> fd closed but request(s) outstanding */ 161 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 162 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ 163 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 164 char mmap_called; /* 0 -> mmap() never called on this fd */ 165 } Sg_fd; 166 167 typedef struct sg_device { /* holds the state of each scsi generic device */ 168 struct scsi_device *device; 169 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ 170 int sg_tablesize; /* adapter's max scatter-gather table size */ 171 Sg_fd *headfp; /* first open fd belonging to this device */ 172 volatile char detached; /* 0->attached, 1->detached pending removal */ 173 volatile char exclude; /* opened for exclusive access */ 174 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 175 struct gendisk *disk; 176 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 177 } Sg_device; 178 179 static int sg_fasync(int fd, struct file *filp, int mode); 180 static void sg_cmd_done(Scsi_Cmnd * SCpnt); /* tasklet or soft irq callback */ 181 static int sg_start_req(Sg_request * srp); 182 static void sg_finish_rem_req(Sg_request * srp); 183 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 184 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, 185 int tablesize); 186 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 187 Sg_request * srp); 188 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 189 int blocking, int read_only, Sg_request ** o_srp); 190 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 191 unsigned char *cmnd, int timeout, int blocking); 192 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 193 int wr_xf, int *countp, unsigned char __user **up); 194 static int sg_write_xfer(Sg_request * srp); 195 static int sg_read_xfer(Sg_request * srp); 196 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 197 static void sg_remove_scat(Sg_scatter_hold * schp); 198 static void sg_build_reserve(Sg_fd * sfp, int req_size); 199 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 200 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 201 static char *sg_page_malloc(int rqSz, int lowDma, int *retSzp); 202 static void sg_page_free(char *buff, int size); 203 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 204 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 205 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 206 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 207 static Sg_request *sg_add_request(Sg_fd * sfp); 208 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 209 static int sg_res_in_use(Sg_fd * sfp); 210 static int sg_allow_access(unsigned char opcode, char dev_type); 211 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); 212 static Sg_device *sg_get_dev(int dev); 213 static inline unsigned char *sg_scatg2virt(const struct scatterlist *sclp); 214 #ifdef CONFIG_SCSI_PROC_FS 215 static int sg_last_dev(void); 216 #endif 217 218 static Sg_device **sg_dev_arr = NULL; 219 static int sg_dev_max; 220 static int sg_nr_dev; 221 222 #define SZ_SG_HEADER sizeof(struct sg_header) 223 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 224 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 225 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 226 227 static int 228 sg_open(struct inode *inode, struct file *filp) 229 { 230 int dev = iminor(inode); 231 int flags = filp->f_flags; 232 Sg_device *sdp; 233 Sg_fd *sfp; 234 int res; 235 int retval; 236 237 nonseekable_open(inode, filp); 238 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 239 sdp = sg_get_dev(dev); 240 if ((!sdp) || (!sdp->device)) 241 return -ENXIO; 242 if (sdp->detached) 243 return -ENODEV; 244 245 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 246 /* Prevent the device driver from vanishing while we sleep */ 247 retval = scsi_device_get(sdp->device); 248 if (retval) 249 return retval; 250 251 if (!((flags & O_NONBLOCK) || 252 scsi_block_when_processing_errors(sdp->device))) { 253 retval = -ENXIO; 254 /* we are in error recovery for this device */ 255 goto error_out; 256 } 257 258 if (flags & O_EXCL) { 259 if (O_RDONLY == (flags & O_ACCMODE)) { 260 retval = -EPERM; /* Can't lock it with read only access */ 261 goto error_out; 262 } 263 if (sdp->headfp && (flags & O_NONBLOCK)) { 264 retval = -EBUSY; 265 goto error_out; 266 } 267 res = 0; 268 __wait_event_interruptible(sdp->o_excl_wait, 269 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); 270 if (res) { 271 retval = res; /* -ERESTARTSYS because signal hit process */ 272 goto error_out; 273 } 274 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ 275 if (flags & O_NONBLOCK) { 276 retval = -EBUSY; 277 goto error_out; 278 } 279 res = 0; 280 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), 281 res); 282 if (res) { 283 retval = res; /* -ERESTARTSYS because signal hit process */ 284 goto error_out; 285 } 286 } 287 if (sdp->detached) { 288 retval = -ENODEV; 289 goto error_out; 290 } 291 if (!sdp->headfp) { /* no existing opens on this device */ 292 sdp->sgdebug = 0; 293 sdp->sg_tablesize = sdp->device->host->sg_tablesize; 294 } 295 if ((sfp = sg_add_sfp(sdp, dev))) 296 filp->private_data = sfp; 297 else { 298 if (flags & O_EXCL) 299 sdp->exclude = 0; /* undo if error */ 300 retval = -ENOMEM; 301 goto error_out; 302 } 303 return 0; 304 305 error_out: 306 scsi_device_put(sdp->device); 307 return retval; 308 } 309 310 /* Following function was formerly called 'sg_close' */ 311 static int 312 sg_release(struct inode *inode, struct file *filp) 313 { 314 Sg_device *sdp; 315 Sg_fd *sfp; 316 317 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 318 return -ENXIO; 319 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 320 sg_fasync(-1, filp, 0); /* remove filp from async notification list */ 321 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ 322 if (!sdp->detached) { 323 scsi_device_put(sdp->device); 324 } 325 sdp->exclude = 0; 326 wake_up_interruptible(&sdp->o_excl_wait); 327 } 328 return 0; 329 } 330 331 static ssize_t 332 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 333 { 334 Sg_device *sdp; 335 Sg_fd *sfp; 336 Sg_request *srp; 337 int req_pack_id = -1; 338 sg_io_hdr_t *hp; 339 struct sg_header *old_hdr = NULL; 340 int retval = 0; 341 342 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 343 return -ENXIO; 344 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 345 sdp->disk->disk_name, (int) count)); 346 if (!access_ok(VERIFY_WRITE, buf, count)) 347 return -EFAULT; 348 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 349 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 350 if (!old_hdr) 351 return -ENOMEM; 352 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 353 retval = -EFAULT; 354 goto free_old_hdr; 355 } 356 if (old_hdr->reply_len < 0) { 357 if (count >= SZ_SG_IO_HDR) { 358 sg_io_hdr_t *new_hdr; 359 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 360 if (!new_hdr) { 361 retval = -ENOMEM; 362 goto free_old_hdr; 363 } 364 retval =__copy_from_user 365 (new_hdr, buf, SZ_SG_IO_HDR); 366 req_pack_id = new_hdr->pack_id; 367 kfree(new_hdr); 368 if (retval) { 369 retval = -EFAULT; 370 goto free_old_hdr; 371 } 372 } 373 } else 374 req_pack_id = old_hdr->pack_id; 375 } 376 srp = sg_get_rq_mark(sfp, req_pack_id); 377 if (!srp) { /* now wait on packet to arrive */ 378 if (sdp->detached) { 379 retval = -ENODEV; 380 goto free_old_hdr; 381 } 382 if (filp->f_flags & O_NONBLOCK) { 383 retval = -EAGAIN; 384 goto free_old_hdr; 385 } 386 while (1) { 387 retval = 0; /* following macro beats race condition */ 388 __wait_event_interruptible(sfp->read_wait, 389 (sdp->detached || 390 (srp = sg_get_rq_mark(sfp, req_pack_id))), 391 retval); 392 if (sdp->detached) { 393 retval = -ENODEV; 394 goto free_old_hdr; 395 } 396 if (0 == retval) 397 break; 398 399 /* -ERESTARTSYS as signal hit process */ 400 goto free_old_hdr; 401 } 402 } 403 if (srp->header.interface_id != '\0') { 404 retval = sg_new_read(sfp, buf, count, srp); 405 goto free_old_hdr; 406 } 407 408 hp = &srp->header; 409 if (old_hdr == NULL) { 410 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 411 if (! old_hdr) { 412 retval = -ENOMEM; 413 goto free_old_hdr; 414 } 415 } 416 memset(old_hdr, 0, SZ_SG_HEADER); 417 old_hdr->reply_len = (int) hp->timeout; 418 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 419 old_hdr->pack_id = hp->pack_id; 420 old_hdr->twelve_byte = 421 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 422 old_hdr->target_status = hp->masked_status; 423 old_hdr->host_status = hp->host_status; 424 old_hdr->driver_status = hp->driver_status; 425 if ((CHECK_CONDITION & hp->masked_status) || 426 (DRIVER_SENSE & hp->driver_status)) 427 memcpy(old_hdr->sense_buffer, srp->sense_b, 428 sizeof (old_hdr->sense_buffer)); 429 switch (hp->host_status) { 430 /* This setup of 'result' is for backward compatibility and is best 431 ignored by the user who should use target, host + driver status */ 432 case DID_OK: 433 case DID_PASSTHROUGH: 434 case DID_SOFT_ERROR: 435 old_hdr->result = 0; 436 break; 437 case DID_NO_CONNECT: 438 case DID_BUS_BUSY: 439 case DID_TIME_OUT: 440 old_hdr->result = EBUSY; 441 break; 442 case DID_BAD_TARGET: 443 case DID_ABORT: 444 case DID_PARITY: 445 case DID_RESET: 446 case DID_BAD_INTR: 447 old_hdr->result = EIO; 448 break; 449 case DID_ERROR: 450 old_hdr->result = (srp->sense_b[0] == 0 && 451 hp->masked_status == GOOD) ? 0 : EIO; 452 break; 453 default: 454 old_hdr->result = EIO; 455 break; 456 } 457 458 /* Now copy the result back to the user buffer. */ 459 if (count >= SZ_SG_HEADER) { 460 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 461 retval = -EFAULT; 462 goto free_old_hdr; 463 } 464 buf += SZ_SG_HEADER; 465 if (count > old_hdr->reply_len) 466 count = old_hdr->reply_len; 467 if (count > SZ_SG_HEADER) { 468 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 469 retval = -EFAULT; 470 goto free_old_hdr; 471 } 472 } 473 } else 474 count = (old_hdr->result == 0) ? 0 : -EIO; 475 sg_finish_rem_req(srp); 476 retval = count; 477 free_old_hdr: 478 if (old_hdr) 479 kfree(old_hdr); 480 return retval; 481 } 482 483 static ssize_t 484 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 485 { 486 sg_io_hdr_t *hp = &srp->header; 487 int err = 0; 488 int len; 489 490 if (count < SZ_SG_IO_HDR) { 491 err = -EINVAL; 492 goto err_out; 493 } 494 hp->sb_len_wr = 0; 495 if ((hp->mx_sb_len > 0) && hp->sbp) { 496 if ((CHECK_CONDITION & hp->masked_status) || 497 (DRIVER_SENSE & hp->driver_status)) { 498 int sb_len = sizeof (dummy_cmdp->sr_sense_buffer); 499 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 500 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 501 len = (len > sb_len) ? sb_len : len; 502 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 503 err = -EFAULT; 504 goto err_out; 505 } 506 hp->sb_len_wr = len; 507 } 508 } 509 if (hp->masked_status || hp->host_status || hp->driver_status) 510 hp->info |= SG_INFO_CHECK; 511 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 512 err = -EFAULT; 513 goto err_out; 514 } 515 err = sg_read_xfer(srp); 516 err_out: 517 sg_finish_rem_req(srp); 518 return (0 == err) ? count : err; 519 } 520 521 static ssize_t 522 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 523 { 524 int mxsize, cmd_size, k; 525 int input_size, blocking; 526 unsigned char opcode; 527 Sg_device *sdp; 528 Sg_fd *sfp; 529 Sg_request *srp; 530 struct sg_header old_hdr; 531 sg_io_hdr_t *hp; 532 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)]; 533 534 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 535 return -ENXIO; 536 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 537 sdp->disk->disk_name, (int) count)); 538 if (sdp->detached) 539 return -ENODEV; 540 if (!((filp->f_flags & O_NONBLOCK) || 541 scsi_block_when_processing_errors(sdp->device))) 542 return -ENXIO; 543 544 if (!access_ok(VERIFY_READ, buf, count)) 545 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 546 if (count < SZ_SG_HEADER) 547 return -EIO; 548 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 549 return -EFAULT; 550 blocking = !(filp->f_flags & O_NONBLOCK); 551 if (old_hdr.reply_len < 0) 552 return sg_new_write(sfp, buf, count, blocking, 0, NULL); 553 if (count < (SZ_SG_HEADER + 6)) 554 return -EIO; /* The minimum scsi command length is 6 bytes. */ 555 556 if (!(srp = sg_add_request(sfp))) { 557 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 558 return -EDOM; 559 } 560 buf += SZ_SG_HEADER; 561 __get_user(opcode, buf); 562 if (sfp->next_cmd_len > 0) { 563 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 564 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 565 sfp->next_cmd_len = 0; 566 sg_remove_request(sfp, srp); 567 return -EIO; 568 } 569 cmd_size = sfp->next_cmd_len; 570 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 571 } else { 572 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 573 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 574 cmd_size = 12; 575 } 576 SCSI_LOG_TIMEOUT(4, printk( 577 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 578 /* Determine buffer size. */ 579 input_size = count - cmd_size; 580 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 581 mxsize -= SZ_SG_HEADER; 582 input_size -= SZ_SG_HEADER; 583 if (input_size < 0) { 584 sg_remove_request(sfp, srp); 585 return -EIO; /* User did not pass enough bytes for this command. */ 586 } 587 hp = &srp->header; 588 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 589 hp->cmd_len = (unsigned char) cmd_size; 590 hp->iovec_count = 0; 591 hp->mx_sb_len = 0; 592 if (input_size > 0) 593 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 594 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 595 else 596 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 597 hp->dxfer_len = mxsize; 598 hp->dxferp = (char __user *)buf + cmd_size; 599 hp->sbp = NULL; 600 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 601 hp->flags = input_size; /* structure abuse ... */ 602 hp->pack_id = old_hdr.pack_id; 603 hp->usr_ptr = NULL; 604 if (__copy_from_user(cmnd, buf, cmd_size)) 605 return -EFAULT; 606 /* 607 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 608 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 609 * is a non-zero input_size, so emit a warning. 610 */ 611 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) 612 if (printk_ratelimit()) 613 printk(KERN_WARNING 614 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" 615 "guessing data in;\n" KERN_WARNING " " 616 "program %s not setting count and/or reply_len properly\n", 617 old_hdr.reply_len - (int)SZ_SG_HEADER, 618 input_size, (unsigned int) cmnd[0], 619 current->comm); 620 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 621 return (k < 0) ? k : count; 622 } 623 624 static ssize_t 625 sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 626 int blocking, int read_only, Sg_request ** o_srp) 627 { 628 int k; 629 Sg_request *srp; 630 sg_io_hdr_t *hp; 631 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)]; 632 int timeout; 633 unsigned long ul_timeout; 634 635 if (count < SZ_SG_IO_HDR) 636 return -EINVAL; 637 if (!access_ok(VERIFY_READ, buf, count)) 638 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 639 640 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 641 if (!(srp = sg_add_request(sfp))) { 642 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 643 return -EDOM; 644 } 645 hp = &srp->header; 646 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 647 sg_remove_request(sfp, srp); 648 return -EFAULT; 649 } 650 if (hp->interface_id != 'S') { 651 sg_remove_request(sfp, srp); 652 return -ENOSYS; 653 } 654 if (hp->flags & SG_FLAG_MMAP_IO) { 655 if (hp->dxfer_len > sfp->reserve.bufflen) { 656 sg_remove_request(sfp, srp); 657 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 658 } 659 if (hp->flags & SG_FLAG_DIRECT_IO) { 660 sg_remove_request(sfp, srp); 661 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 662 } 663 if (sg_res_in_use(sfp)) { 664 sg_remove_request(sfp, srp); 665 return -EBUSY; /* reserve buffer already being used */ 666 } 667 } 668 ul_timeout = msecs_to_jiffies(srp->header.timeout); 669 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 670 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 671 sg_remove_request(sfp, srp); 672 return -EMSGSIZE; 673 } 674 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 675 sg_remove_request(sfp, srp); 676 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 677 } 678 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 679 sg_remove_request(sfp, srp); 680 return -EFAULT; 681 } 682 if (read_only && 683 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) { 684 sg_remove_request(sfp, srp); 685 return -EPERM; 686 } 687 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 688 if (k < 0) 689 return k; 690 if (o_srp) 691 *o_srp = srp; 692 return count; 693 } 694 695 static int 696 sg_common_write(Sg_fd * sfp, Sg_request * srp, 697 unsigned char *cmnd, int timeout, int blocking) 698 { 699 int k; 700 Scsi_Request *SRpnt; 701 Sg_device *sdp = sfp->parentdp; 702 sg_io_hdr_t *hp = &srp->header; 703 request_queue_t *q; 704 705 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 706 hp->status = 0; 707 hp->masked_status = 0; 708 hp->msg_status = 0; 709 hp->info = 0; 710 hp->host_status = 0; 711 hp->driver_status = 0; 712 hp->resid = 0; 713 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 714 (int) cmnd[0], (int) hp->cmd_len)); 715 716 if ((k = sg_start_req(srp))) { 717 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k)); 718 sg_finish_rem_req(srp); 719 return k; /* probably out of space --> ENOMEM */ 720 } 721 if ((k = sg_write_xfer(srp))) { 722 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n")); 723 sg_finish_rem_req(srp); 724 return k; 725 } 726 if (sdp->detached) { 727 sg_finish_rem_req(srp); 728 return -ENODEV; 729 } 730 SRpnt = scsi_allocate_request(sdp->device, GFP_ATOMIC); 731 if (SRpnt == NULL) { 732 SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n")); 733 sg_finish_rem_req(srp); 734 return -ENOMEM; 735 } 736 737 srp->my_cmdp = SRpnt; 738 q = SRpnt->sr_device->request_queue; 739 SRpnt->sr_request->rq_disk = sdp->disk; 740 SRpnt->sr_sense_buffer[0] = 0; 741 SRpnt->sr_cmd_len = hp->cmd_len; 742 SRpnt->sr_use_sg = srp->data.k_use_sg; 743 SRpnt->sr_sglist_len = srp->data.sglist_len; 744 SRpnt->sr_bufflen = srp->data.bufflen; 745 SRpnt->sr_underflow = 0; 746 SRpnt->sr_buffer = srp->data.buffer; 747 switch (hp->dxfer_direction) { 748 case SG_DXFER_TO_FROM_DEV: 749 case SG_DXFER_FROM_DEV: 750 SRpnt->sr_data_direction = DMA_FROM_DEVICE; 751 break; 752 case SG_DXFER_TO_DEV: 753 SRpnt->sr_data_direction = DMA_TO_DEVICE; 754 break; 755 case SG_DXFER_UNKNOWN: 756 SRpnt->sr_data_direction = DMA_BIDIRECTIONAL; 757 break; 758 default: 759 SRpnt->sr_data_direction = DMA_NONE; 760 break; 761 } 762 SRpnt->upper_private_data = srp; 763 srp->data.k_use_sg = 0; 764 srp->data.sglist_len = 0; 765 srp->data.bufflen = 0; 766 srp->data.buffer = NULL; 767 hp->duration = jiffies_to_msecs(jiffies); 768 /* Now send everything of to mid-level. The next time we hear about this 769 packet is when sg_cmd_done() is called (i.e. a callback). */ 770 scsi_do_req(SRpnt, (void *) cmnd, 771 (void *) SRpnt->sr_buffer, hp->dxfer_len, 772 sg_cmd_done, timeout, SG_DEFAULT_RETRIES); 773 /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */ 774 return 0; 775 } 776 777 static int 778 sg_srp_done(Sg_request *srp, Sg_fd *sfp) 779 { 780 unsigned long iflags; 781 int done; 782 783 read_lock_irqsave(&sfp->rq_list_lock, iflags); 784 done = srp->done; 785 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 786 return done; 787 } 788 789 static int 790 sg_ioctl(struct inode *inode, struct file *filp, 791 unsigned int cmd_in, unsigned long arg) 792 { 793 void __user *p = (void __user *)arg; 794 int __user *ip = p; 795 int result, val, read_only; 796 Sg_device *sdp; 797 Sg_fd *sfp; 798 Sg_request *srp; 799 unsigned long iflags; 800 801 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 802 return -ENXIO; 803 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 804 sdp->disk->disk_name, (int) cmd_in)); 805 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 806 807 switch (cmd_in) { 808 case SG_IO: 809 { 810 int blocking = 1; /* ignore O_NONBLOCK flag */ 811 812 if (sdp->detached) 813 return -ENODEV; 814 if (!scsi_block_when_processing_errors(sdp->device)) 815 return -ENXIO; 816 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 817 return -EFAULT; 818 result = 819 sg_new_write(sfp, p, SZ_SG_IO_HDR, 820 blocking, read_only, &srp); 821 if (result < 0) 822 return result; 823 srp->sg_io_owned = 1; 824 while (1) { 825 result = 0; /* following macro to beat race condition */ 826 __wait_event_interruptible(sfp->read_wait, 827 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), 828 result); 829 if (sdp->detached) 830 return -ENODEV; 831 if (sfp->closed) 832 return 0; /* request packet dropped already */ 833 if (0 == result) 834 break; 835 srp->orphan = 1; 836 return result; /* -ERESTARTSYS because signal hit process */ 837 } 838 write_lock_irqsave(&sfp->rq_list_lock, iflags); 839 srp->done = 2; 840 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 841 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 842 return (result < 0) ? result : 0; 843 } 844 case SG_SET_TIMEOUT: 845 result = get_user(val, ip); 846 if (result) 847 return result; 848 if (val < 0) 849 return -EIO; 850 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 851 val = MULDIV (INT_MAX, USER_HZ, HZ); 852 sfp->timeout_user = val; 853 sfp->timeout = MULDIV (val, HZ, USER_HZ); 854 855 return 0; 856 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 857 /* strange ..., for backward compatibility */ 858 return sfp->timeout_user; 859 case SG_SET_FORCE_LOW_DMA: 860 result = get_user(val, ip); 861 if (result) 862 return result; 863 if (val) { 864 sfp->low_dma = 1; 865 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 866 val = (int) sfp->reserve.bufflen; 867 sg_remove_scat(&sfp->reserve); 868 sg_build_reserve(sfp, val); 869 } 870 } else { 871 if (sdp->detached) 872 return -ENODEV; 873 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 874 } 875 return 0; 876 case SG_GET_LOW_DMA: 877 return put_user((int) sfp->low_dma, ip); 878 case SG_GET_SCSI_ID: 879 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 880 return -EFAULT; 881 else { 882 sg_scsi_id_t __user *sg_idp = p; 883 884 if (sdp->detached) 885 return -ENODEV; 886 __put_user((int) sdp->device->host->host_no, 887 &sg_idp->host_no); 888 __put_user((int) sdp->device->channel, 889 &sg_idp->channel); 890 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 891 __put_user((int) sdp->device->lun, &sg_idp->lun); 892 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 893 __put_user((short) sdp->device->host->cmd_per_lun, 894 &sg_idp->h_cmd_per_lun); 895 __put_user((short) sdp->device->queue_depth, 896 &sg_idp->d_queue_depth); 897 __put_user(0, &sg_idp->unused[0]); 898 __put_user(0, &sg_idp->unused[1]); 899 return 0; 900 } 901 case SG_SET_FORCE_PACK_ID: 902 result = get_user(val, ip); 903 if (result) 904 return result; 905 sfp->force_packid = val ? 1 : 0; 906 return 0; 907 case SG_GET_PACK_ID: 908 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 909 return -EFAULT; 910 read_lock_irqsave(&sfp->rq_list_lock, iflags); 911 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 912 if ((1 == srp->done) && (!srp->sg_io_owned)) { 913 read_unlock_irqrestore(&sfp->rq_list_lock, 914 iflags); 915 __put_user(srp->header.pack_id, ip); 916 return 0; 917 } 918 } 919 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 920 __put_user(-1, ip); 921 return 0; 922 case SG_GET_NUM_WAITING: 923 read_lock_irqsave(&sfp->rq_list_lock, iflags); 924 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 925 if ((1 == srp->done) && (!srp->sg_io_owned)) 926 ++val; 927 } 928 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 929 return put_user(val, ip); 930 case SG_GET_SG_TABLESIZE: 931 return put_user(sdp->sg_tablesize, ip); 932 case SG_SET_RESERVED_SIZE: 933 result = get_user(val, ip); 934 if (result) 935 return result; 936 if (val < 0) 937 return -EINVAL; 938 if (val != sfp->reserve.bufflen) { 939 if (sg_res_in_use(sfp) || sfp->mmap_called) 940 return -EBUSY; 941 sg_remove_scat(&sfp->reserve); 942 sg_build_reserve(sfp, val); 943 } 944 return 0; 945 case SG_GET_RESERVED_SIZE: 946 val = (int) sfp->reserve.bufflen; 947 return put_user(val, ip); 948 case SG_SET_COMMAND_Q: 949 result = get_user(val, ip); 950 if (result) 951 return result; 952 sfp->cmd_q = val ? 1 : 0; 953 return 0; 954 case SG_GET_COMMAND_Q: 955 return put_user((int) sfp->cmd_q, ip); 956 case SG_SET_KEEP_ORPHAN: 957 result = get_user(val, ip); 958 if (result) 959 return result; 960 sfp->keep_orphan = val; 961 return 0; 962 case SG_GET_KEEP_ORPHAN: 963 return put_user((int) sfp->keep_orphan, ip); 964 case SG_NEXT_CMD_LEN: 965 result = get_user(val, ip); 966 if (result) 967 return result; 968 sfp->next_cmd_len = (val > 0) ? val : 0; 969 return 0; 970 case SG_GET_VERSION_NUM: 971 return put_user(sg_version_num, ip); 972 case SG_GET_ACCESS_COUNT: 973 /* faked - we don't have a real access count anymore */ 974 val = (sdp->device ? 1 : 0); 975 return put_user(val, ip); 976 case SG_GET_REQUEST_TABLE: 977 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 978 return -EFAULT; 979 else { 980 sg_req_info_t *rinfo; 981 unsigned int ms; 982 983 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 984 GFP_KERNEL); 985 if (!rinfo) 986 return -ENOMEM; 987 read_lock_irqsave(&sfp->rq_list_lock, iflags); 988 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 989 ++val, srp = srp ? srp->nextrp : srp) { 990 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 991 if (srp) { 992 rinfo[val].req_state = srp->done + 1; 993 rinfo[val].problem = 994 srp->header.masked_status & 995 srp->header.host_status & 996 srp->header.driver_status; 997 if (srp->done) 998 rinfo[val].duration = 999 srp->header.duration; 1000 else { 1001 ms = jiffies_to_msecs(jiffies); 1002 rinfo[val].duration = 1003 (ms > srp->header.duration) ? 1004 (ms - srp->header.duration) : 0; 1005 } 1006 rinfo[val].orphan = srp->orphan; 1007 rinfo[val].sg_io_owned = 1008 srp->sg_io_owned; 1009 rinfo[val].pack_id = 1010 srp->header.pack_id; 1011 rinfo[val].usr_ptr = 1012 srp->header.usr_ptr; 1013 } 1014 } 1015 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1016 result = __copy_to_user(p, rinfo, 1017 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 1018 result = result ? -EFAULT : 0; 1019 kfree(rinfo); 1020 return result; 1021 } 1022 case SG_EMULATED_HOST: 1023 if (sdp->detached) 1024 return -ENODEV; 1025 return put_user(sdp->device->host->hostt->emulated, ip); 1026 case SG_SCSI_RESET: 1027 if (sdp->detached) 1028 return -ENODEV; 1029 if (filp->f_flags & O_NONBLOCK) { 1030 if (test_bit(SHOST_RECOVERY, 1031 &sdp->device->host->shost_state)) 1032 return -EBUSY; 1033 } else if (!scsi_block_when_processing_errors(sdp->device)) 1034 return -EBUSY; 1035 result = get_user(val, ip); 1036 if (result) 1037 return result; 1038 if (SG_SCSI_RESET_NOTHING == val) 1039 return 0; 1040 switch (val) { 1041 case SG_SCSI_RESET_DEVICE: 1042 val = SCSI_TRY_RESET_DEVICE; 1043 break; 1044 case SG_SCSI_RESET_BUS: 1045 val = SCSI_TRY_RESET_BUS; 1046 break; 1047 case SG_SCSI_RESET_HOST: 1048 val = SCSI_TRY_RESET_HOST; 1049 break; 1050 default: 1051 return -EINVAL; 1052 } 1053 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1054 return -EACCES; 1055 return (scsi_reset_provider(sdp->device, val) == 1056 SUCCESS) ? 0 : -EIO; 1057 case SCSI_IOCTL_SEND_COMMAND: 1058 if (sdp->detached) 1059 return -ENODEV; 1060 if (read_only) { 1061 unsigned char opcode = WRITE_6; 1062 Scsi_Ioctl_Command __user *siocp = p; 1063 1064 if (copy_from_user(&opcode, siocp->data, 1)) 1065 return -EFAULT; 1066 if (!sg_allow_access(opcode, sdp->device->type)) 1067 return -EPERM; 1068 } 1069 return scsi_ioctl_send_command(sdp->device, p); 1070 case SG_SET_DEBUG: 1071 result = get_user(val, ip); 1072 if (result) 1073 return result; 1074 sdp->sgdebug = (char) val; 1075 return 0; 1076 case SCSI_IOCTL_GET_IDLUN: 1077 case SCSI_IOCTL_GET_BUS_NUMBER: 1078 case SCSI_IOCTL_PROBE_HOST: 1079 case SG_GET_TRANSFORM: 1080 if (sdp->detached) 1081 return -ENODEV; 1082 return scsi_ioctl(sdp->device, cmd_in, p); 1083 default: 1084 if (read_only) 1085 return -EPERM; /* don't know so take safe approach */ 1086 return scsi_ioctl(sdp->device, cmd_in, p); 1087 } 1088 } 1089 1090 #ifdef CONFIG_COMPAT 1091 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1092 { 1093 Sg_device *sdp; 1094 Sg_fd *sfp; 1095 struct scsi_device *sdev; 1096 1097 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1098 return -ENXIO; 1099 1100 sdev = sdp->device; 1101 if (sdev->host->hostt->compat_ioctl) { 1102 int ret; 1103 1104 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1105 1106 return ret; 1107 } 1108 1109 return -ENOIOCTLCMD; 1110 } 1111 #endif 1112 1113 static unsigned int 1114 sg_poll(struct file *filp, poll_table * wait) 1115 { 1116 unsigned int res = 0; 1117 Sg_device *sdp; 1118 Sg_fd *sfp; 1119 Sg_request *srp; 1120 int count = 0; 1121 unsigned long iflags; 1122 1123 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) 1124 || sfp->closed) 1125 return POLLERR; 1126 poll_wait(filp, &sfp->read_wait, wait); 1127 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1128 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1129 /* if any read waiting, flag it */ 1130 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1131 res = POLLIN | POLLRDNORM; 1132 ++count; 1133 } 1134 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1135 1136 if (sdp->detached) 1137 res |= POLLHUP; 1138 else if (!sfp->cmd_q) { 1139 if (0 == count) 1140 res |= POLLOUT | POLLWRNORM; 1141 } else if (count < SG_MAX_QUEUE) 1142 res |= POLLOUT | POLLWRNORM; 1143 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1144 sdp->disk->disk_name, (int) res)); 1145 return res; 1146 } 1147 1148 static int 1149 sg_fasync(int fd, struct file *filp, int mode) 1150 { 1151 int retval; 1152 Sg_device *sdp; 1153 Sg_fd *sfp; 1154 1155 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1156 return -ENXIO; 1157 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1158 sdp->disk->disk_name, mode)); 1159 1160 retval = fasync_helper(fd, filp, mode, &sfp->async_qp); 1161 return (retval < 0) ? retval : 0; 1162 } 1163 1164 static inline unsigned char * 1165 sg_scatg2virt(const struct scatterlist *sclp) 1166 { 1167 return (sclp && sclp->page) ? 1168 (unsigned char *) page_address(sclp->page) + sclp->offset : NULL; 1169 } 1170 1171 /* When startFinish==1 increments page counts for pages other than the 1172 first of scatter gather elements obtained from __get_free_pages(). 1173 When startFinish==0 decrements ... */ 1174 static void 1175 sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish) 1176 { 1177 void *page_ptr; 1178 struct page *page; 1179 int k, m; 1180 1181 SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n", 1182 startFinish, rsv_schp->k_use_sg)); 1183 /* N.B. correction _not_ applied to base page of each allocation */ 1184 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */ 1185 struct scatterlist *sclp = rsv_schp->buffer; 1186 1187 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) { 1188 for (m = PAGE_SIZE; m < sclp->length; m += PAGE_SIZE) { 1189 page_ptr = sg_scatg2virt(sclp) + m; 1190 page = virt_to_page(page_ptr); 1191 if (startFinish) 1192 get_page(page); 1193 else { 1194 if (page_count(page) > 0) 1195 __put_page(page); 1196 } 1197 } 1198 } 1199 } else { /* reserve buffer is just a single allocation */ 1200 for (m = PAGE_SIZE; m < rsv_schp->bufflen; m += PAGE_SIZE) { 1201 page_ptr = (unsigned char *) rsv_schp->buffer + m; 1202 page = virt_to_page(page_ptr); 1203 if (startFinish) 1204 get_page(page); 1205 else { 1206 if (page_count(page) > 0) 1207 __put_page(page); 1208 } 1209 } 1210 } 1211 } 1212 1213 static struct page * 1214 sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type) 1215 { 1216 Sg_fd *sfp; 1217 struct page *page = NOPAGE_SIGBUS; 1218 void *page_ptr = NULL; 1219 unsigned long offset; 1220 Sg_scatter_hold *rsv_schp; 1221 1222 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1223 return page; 1224 rsv_schp = &sfp->reserve; 1225 offset = addr - vma->vm_start; 1226 if (offset >= rsv_schp->bufflen) 1227 return page; 1228 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n", 1229 offset, rsv_schp->k_use_sg)); 1230 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */ 1231 int k; 1232 unsigned long sa = vma->vm_start; 1233 unsigned long len; 1234 struct scatterlist *sclp = rsv_schp->buffer; 1235 1236 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1237 ++k, ++sclp) { 1238 len = vma->vm_end - sa; 1239 len = (len < sclp->length) ? len : sclp->length; 1240 if (offset < len) { 1241 page_ptr = sg_scatg2virt(sclp) + offset; 1242 page = virt_to_page(page_ptr); 1243 get_page(page); /* increment page count */ 1244 break; 1245 } 1246 sa += len; 1247 offset -= len; 1248 } 1249 } else { /* reserve buffer is just a single allocation */ 1250 page_ptr = (unsigned char *) rsv_schp->buffer + offset; 1251 page = virt_to_page(page_ptr); 1252 get_page(page); /* increment page count */ 1253 } 1254 if (type) 1255 *type = VM_FAULT_MINOR; 1256 return page; 1257 } 1258 1259 static struct vm_operations_struct sg_mmap_vm_ops = { 1260 .nopage = sg_vma_nopage, 1261 }; 1262 1263 static int 1264 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1265 { 1266 Sg_fd *sfp; 1267 unsigned long req_sz; 1268 Sg_scatter_hold *rsv_schp; 1269 1270 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1271 return -ENXIO; 1272 req_sz = vma->vm_end - vma->vm_start; 1273 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1274 (void *) vma->vm_start, (int) req_sz)); 1275 if (vma->vm_pgoff) 1276 return -EINVAL; /* want no offset */ 1277 rsv_schp = &sfp->reserve; 1278 if (req_sz > rsv_schp->bufflen) 1279 return -ENOMEM; /* cannot map more than reserved buffer */ 1280 1281 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */ 1282 int k; 1283 unsigned long sa = vma->vm_start; 1284 unsigned long len; 1285 struct scatterlist *sclp = rsv_schp->buffer; 1286 1287 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); 1288 ++k, ++sclp) { 1289 if (0 != sclp->offset) 1290 return -EFAULT; /* non page aligned memory ?? */ 1291 len = vma->vm_end - sa; 1292 len = (len < sclp->length) ? len : sclp->length; 1293 sa += len; 1294 } 1295 } else { /* reserve buffer is just a single allocation */ 1296 if ((unsigned long) rsv_schp->buffer & (PAGE_SIZE - 1)) 1297 return -EFAULT; /* non page aligned memory ?? */ 1298 } 1299 if (0 == sfp->mmap_called) { 1300 sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */ 1301 sfp->mmap_called = 1; 1302 } 1303 vma->vm_flags |= (VM_RESERVED | VM_IO); 1304 vma->vm_private_data = sfp; 1305 vma->vm_ops = &sg_mmap_vm_ops; 1306 return 0; 1307 } 1308 1309 /* This function is a "bottom half" handler that is called by the 1310 * mid level when a command is completed (or has failed). */ 1311 static void 1312 sg_cmd_done(Scsi_Cmnd * SCpnt) 1313 { 1314 Scsi_Request *SRpnt = NULL; 1315 Sg_device *sdp = NULL; 1316 Sg_fd *sfp; 1317 Sg_request *srp = NULL; 1318 unsigned long iflags; 1319 unsigned int ms; 1320 1321 if (SCpnt && (SRpnt = SCpnt->sc_request)) 1322 srp = (Sg_request *) SRpnt->upper_private_data; 1323 if (NULL == srp) { 1324 printk(KERN_ERR "sg_cmd_done: NULL request\n"); 1325 if (SRpnt) 1326 scsi_release_request(SRpnt); 1327 return; 1328 } 1329 sfp = srp->parentfp; 1330 if (sfp) 1331 sdp = sfp->parentdp; 1332 if ((NULL == sdp) || sdp->detached) { 1333 printk(KERN_INFO "sg_cmd_done: device detached\n"); 1334 scsi_release_request(SRpnt); 1335 return; 1336 } 1337 1338 /* First transfer ownership of data buffers to sg_device object. */ 1339 srp->data.k_use_sg = SRpnt->sr_use_sg; 1340 srp->data.sglist_len = SRpnt->sr_sglist_len; 1341 srp->data.bufflen = SRpnt->sr_bufflen; 1342 srp->data.buffer = SRpnt->sr_buffer; 1343 /* now clear out request structure */ 1344 SRpnt->sr_use_sg = 0; 1345 SRpnt->sr_sglist_len = 0; 1346 SRpnt->sr_bufflen = 0; 1347 SRpnt->sr_buffer = NULL; 1348 SRpnt->sr_underflow = 0; 1349 SRpnt->sr_request->rq_disk = NULL; /* "sg" _disowns_ request blk */ 1350 1351 srp->my_cmdp = NULL; 1352 1353 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1354 sdp->disk->disk_name, srp->header.pack_id, (int) SRpnt->sr_result)); 1355 srp->header.resid = SCpnt->resid; 1356 ms = jiffies_to_msecs(jiffies); 1357 srp->header.duration = (ms > srp->header.duration) ? 1358 (ms - srp->header.duration) : 0; 1359 if (0 != SRpnt->sr_result) { 1360 struct scsi_sense_hdr sshdr; 1361 1362 memcpy(srp->sense_b, SRpnt->sr_sense_buffer, 1363 sizeof (srp->sense_b)); 1364 srp->header.status = 0xff & SRpnt->sr_result; 1365 srp->header.masked_status = status_byte(SRpnt->sr_result); 1366 srp->header.msg_status = msg_byte(SRpnt->sr_result); 1367 srp->header.host_status = host_byte(SRpnt->sr_result); 1368 srp->header.driver_status = driver_byte(SRpnt->sr_result); 1369 if ((sdp->sgdebug > 0) && 1370 ((CHECK_CONDITION == srp->header.masked_status) || 1371 (COMMAND_TERMINATED == srp->header.masked_status))) 1372 scsi_print_req_sense("sg_cmd_done", SRpnt); 1373 1374 /* Following if statement is a patch supplied by Eric Youngdale */ 1375 if (driver_byte(SRpnt->sr_result) != 0 1376 && scsi_command_normalize_sense(SCpnt, &sshdr) 1377 && !scsi_sense_is_deferred(&sshdr) 1378 && sshdr.sense_key == UNIT_ATTENTION 1379 && sdp->device->removable) { 1380 /* Detected possible disc change. Set the bit - this */ 1381 /* may be used if there are filesystems using this device */ 1382 sdp->device->changed = 1; 1383 } 1384 } 1385 /* Rely on write phase to clean out srp status values, so no "else" */ 1386 1387 scsi_release_request(SRpnt); 1388 SRpnt = NULL; 1389 if (sfp->closed) { /* whoops this fd already released, cleanup */ 1390 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); 1391 sg_finish_rem_req(srp); 1392 srp = NULL; 1393 if (NULL == sfp->headrp) { 1394 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n")); 1395 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ 1396 scsi_device_put(sdp->device); 1397 } 1398 sfp = NULL; 1399 } 1400 } else if (srp && srp->orphan) { 1401 if (sfp->keep_orphan) 1402 srp->sg_io_owned = 0; 1403 else { 1404 sg_finish_rem_req(srp); 1405 srp = NULL; 1406 } 1407 } 1408 if (sfp && srp) { 1409 /* Now wake up any sg_read() that is waiting for this packet. */ 1410 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1411 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1412 srp->done = 1; 1413 wake_up_interruptible(&sfp->read_wait); 1414 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1415 } 1416 } 1417 1418 static struct file_operations sg_fops = { 1419 .owner = THIS_MODULE, 1420 .read = sg_read, 1421 .write = sg_write, 1422 .poll = sg_poll, 1423 .ioctl = sg_ioctl, 1424 #ifdef CONFIG_COMPAT 1425 .compat_ioctl = sg_compat_ioctl, 1426 #endif 1427 .open = sg_open, 1428 .mmap = sg_mmap, 1429 .release = sg_release, 1430 .fasync = sg_fasync, 1431 }; 1432 1433 static struct class *sg_sysfs_class; 1434 1435 static int sg_sysfs_valid = 0; 1436 1437 static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1438 { 1439 Sg_device *sdp; 1440 unsigned long iflags; 1441 void *old_sg_dev_arr = NULL; 1442 int k, error; 1443 1444 sdp = kmalloc(sizeof(Sg_device), GFP_KERNEL); 1445 if (!sdp) { 1446 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1447 return -ENOMEM; 1448 } 1449 1450 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1451 if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */ 1452 Sg_device **tmp_da; 1453 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP; 1454 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1455 1456 tmp_da = kmalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL); 1457 if (unlikely(!tmp_da)) 1458 goto expand_failed; 1459 1460 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1461 memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *)); 1462 memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *)); 1463 old_sg_dev_arr = sg_dev_arr; 1464 sg_dev_arr = tmp_da; 1465 sg_dev_max = tmp_dev_max; 1466 } 1467 1468 for (k = 0; k < sg_dev_max; k++) 1469 if (!sg_dev_arr[k]) 1470 break; 1471 if (unlikely(k >= SG_MAX_DEVS)) 1472 goto overflow; 1473 1474 memset(sdp, 0, sizeof(*sdp)); 1475 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1476 sprintf(disk->disk_name, "sg%d", k); 1477 disk->first_minor = k; 1478 sdp->disk = disk; 1479 sdp->device = scsidp; 1480 init_waitqueue_head(&sdp->o_excl_wait); 1481 sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0; 1482 1483 sg_nr_dev++; 1484 sg_dev_arr[k] = sdp; 1485 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1486 error = k; 1487 1488 out: 1489 if (error < 0) 1490 kfree(sdp); 1491 kfree(old_sg_dev_arr); 1492 return error; 1493 1494 expand_failed: 1495 printk(KERN_WARNING "sg_alloc: device array cannot be resized\n"); 1496 error = -ENOMEM; 1497 goto out; 1498 1499 overflow: 1500 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1501 printk(KERN_WARNING 1502 "Unable to attach sg device <%d, %d, %d, %d> type=%d, minor " 1503 "number exceeds %d\n", scsidp->host->host_no, scsidp->channel, 1504 scsidp->id, scsidp->lun, scsidp->type, SG_MAX_DEVS - 1); 1505 error = -ENODEV; 1506 goto out; 1507 } 1508 1509 static int 1510 sg_add(struct class_device *cl_dev) 1511 { 1512 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); 1513 struct gendisk *disk; 1514 Sg_device *sdp = NULL; 1515 struct cdev * cdev = NULL; 1516 int error, k; 1517 1518 disk = alloc_disk(1); 1519 if (!disk) { 1520 printk(KERN_WARNING "alloc_disk failed\n"); 1521 return -ENOMEM; 1522 } 1523 disk->major = SCSI_GENERIC_MAJOR; 1524 1525 error = -ENOMEM; 1526 cdev = cdev_alloc(); 1527 if (!cdev) { 1528 printk(KERN_WARNING "cdev_alloc failed\n"); 1529 goto out; 1530 } 1531 cdev->owner = THIS_MODULE; 1532 cdev->ops = &sg_fops; 1533 1534 error = sg_alloc(disk, scsidp); 1535 if (error < 0) { 1536 printk(KERN_WARNING "sg_alloc failed\n"); 1537 goto out; 1538 } 1539 k = error; 1540 sdp = sg_dev_arr[k]; 1541 1542 devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k), 1543 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, 1544 "%s/generic", scsidp->devfs_name); 1545 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1); 1546 if (error) { 1547 devfs_remove("%s/generic", scsidp->devfs_name); 1548 goto out; 1549 } 1550 sdp->cdev = cdev; 1551 if (sg_sysfs_valid) { 1552 struct class_device * sg_class_member; 1553 1554 sg_class_member = class_device_create(sg_sysfs_class, 1555 MKDEV(SCSI_GENERIC_MAJOR, k), 1556 cl_dev->dev, "%s", 1557 disk->disk_name); 1558 if (IS_ERR(sg_class_member)) 1559 printk(KERN_WARNING "sg_add: " 1560 "class_device_create failed\n"); 1561 class_set_devdata(sg_class_member, sdp); 1562 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1563 &sg_class_member->kobj, "generic"); 1564 if (error) 1565 printk(KERN_ERR "sg_add: unable to make symlink " 1566 "'generic' back to sg%d\n", k); 1567 } else 1568 printk(KERN_WARNING "sg_add: sg_sys INvalid\n"); 1569 1570 printk(KERN_NOTICE 1571 "Attached scsi generic sg%d at scsi%d, channel" 1572 " %d, id %d, lun %d, type %d\n", k, 1573 scsidp->host->host_no, scsidp->channel, scsidp->id, 1574 scsidp->lun, scsidp->type); 1575 1576 return 0; 1577 1578 out: 1579 put_disk(disk); 1580 if (cdev) 1581 cdev_del(cdev); 1582 return error; 1583 } 1584 1585 static void 1586 sg_remove(struct class_device *cl_dev) 1587 { 1588 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); 1589 Sg_device *sdp = NULL; 1590 unsigned long iflags; 1591 Sg_fd *sfp; 1592 Sg_fd *tsfp; 1593 Sg_request *srp; 1594 Sg_request *tsrp; 1595 int k, delay; 1596 1597 if (NULL == sg_dev_arr) 1598 return; 1599 delay = 0; 1600 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1601 for (k = 0; k < sg_dev_max; k++) { 1602 sdp = sg_dev_arr[k]; 1603 if ((NULL == sdp) || (sdp->device != scsidp)) 1604 continue; /* dirty but lowers nesting */ 1605 if (sdp->headfp) { 1606 sdp->detached = 1; 1607 for (sfp = sdp->headfp; sfp; sfp = tsfp) { 1608 tsfp = sfp->nextfp; 1609 for (srp = sfp->headrp; srp; srp = tsrp) { 1610 tsrp = srp->nextrp; 1611 if (sfp->closed || (0 == sg_srp_done(srp, sfp))) 1612 sg_finish_rem_req(srp); 1613 } 1614 if (sfp->closed) { 1615 scsi_device_put(sdp->device); 1616 __sg_remove_sfp(sdp, sfp); 1617 } else { 1618 delay = 1; 1619 wake_up_interruptible(&sfp->read_wait); 1620 kill_fasync(&sfp->async_qp, SIGPOLL, 1621 POLL_HUP); 1622 } 1623 } 1624 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k)); 1625 if (NULL == sdp->headfp) { 1626 sg_dev_arr[k] = NULL; 1627 } 1628 } else { /* nothing active, simple case */ 1629 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k)); 1630 sg_dev_arr[k] = NULL; 1631 } 1632 sg_nr_dev--; 1633 break; 1634 } 1635 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1636 1637 if (sdp) { 1638 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1639 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k)); 1640 cdev_del(sdp->cdev); 1641 sdp->cdev = NULL; 1642 devfs_remove("%s/generic", scsidp->devfs_name); 1643 put_disk(sdp->disk); 1644 sdp->disk = NULL; 1645 if (NULL == sdp->headfp) 1646 kfree((char *) sdp); 1647 } 1648 1649 if (delay) 1650 msleep(10); /* dirty detach so delay device destruction */ 1651 } 1652 1653 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 1654 * of sysfs parameters (which module_param doesn't yet support). 1655 * Sysfs parameters defined explicitly below. 1656 */ 1657 module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO); 1658 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1659 1660 MODULE_AUTHOR("Douglas Gilbert"); 1661 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1662 MODULE_LICENSE("GPL"); 1663 MODULE_VERSION(SG_VERSION_STR); 1664 1665 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1666 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1667 1668 static int __init 1669 init_sg(void) 1670 { 1671 int rc; 1672 1673 if (def_reserved_size >= 0) 1674 sg_big_buff = def_reserved_size; 1675 1676 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1677 SG_MAX_DEVS, "sg"); 1678 if (rc) 1679 return rc; 1680 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1681 if ( IS_ERR(sg_sysfs_class) ) { 1682 rc = PTR_ERR(sg_sysfs_class); 1683 goto err_out; 1684 } 1685 sg_sysfs_valid = 1; 1686 rc = scsi_register_interface(&sg_interface); 1687 if (0 == rc) { 1688 #ifdef CONFIG_SCSI_PROC_FS 1689 sg_proc_init(); 1690 #endif /* CONFIG_SCSI_PROC_FS */ 1691 return 0; 1692 } 1693 class_destroy(sg_sysfs_class); 1694 err_out: 1695 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1696 return rc; 1697 } 1698 1699 static void __exit 1700 exit_sg(void) 1701 { 1702 #ifdef CONFIG_SCSI_PROC_FS 1703 sg_proc_cleanup(); 1704 #endif /* CONFIG_SCSI_PROC_FS */ 1705 scsi_unregister_interface(&sg_interface); 1706 class_destroy(sg_sysfs_class); 1707 sg_sysfs_valid = 0; 1708 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1709 SG_MAX_DEVS); 1710 if (sg_dev_arr != NULL) { 1711 kfree((char *) sg_dev_arr); 1712 sg_dev_arr = NULL; 1713 } 1714 sg_dev_max = 0; 1715 } 1716 1717 static int 1718 sg_start_req(Sg_request * srp) 1719 { 1720 int res; 1721 Sg_fd *sfp = srp->parentfp; 1722 sg_io_hdr_t *hp = &srp->header; 1723 int dxfer_len = (int) hp->dxfer_len; 1724 int dxfer_dir = hp->dxfer_direction; 1725 Sg_scatter_hold *req_schp = &srp->data; 1726 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1727 1728 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); 1729 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1730 return 0; 1731 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && 1732 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && 1733 (!sfp->parentdp->device->host->unchecked_isa_dma)) { 1734 res = sg_build_direct(srp, sfp, dxfer_len); 1735 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ 1736 return res; 1737 } 1738 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) 1739 sg_link_reserve(sfp, srp, dxfer_len); 1740 else { 1741 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1742 if (res) { 1743 sg_remove_scat(req_schp); 1744 return res; 1745 } 1746 } 1747 return 0; 1748 } 1749 1750 static void 1751 sg_finish_rem_req(Sg_request * srp) 1752 { 1753 Sg_fd *sfp = srp->parentfp; 1754 Sg_scatter_hold *req_schp = &srp->data; 1755 1756 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1757 if (srp->res_used) 1758 sg_unlink_reserve(sfp, srp); 1759 else 1760 sg_remove_scat(req_schp); 1761 sg_remove_request(sfp, srp); 1762 } 1763 1764 static int 1765 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1766 { 1767 int ret_sz; 1768 int elem_sz = sizeof (struct scatterlist); 1769 int sg_bufflen = tablesize * elem_sz; 1770 int mx_sc_elems = tablesize; 1771 1772 schp->buffer = sg_page_malloc(sg_bufflen, sfp->low_dma, &ret_sz); 1773 if (!schp->buffer) 1774 return -ENOMEM; 1775 else if (ret_sz != sg_bufflen) { 1776 sg_bufflen = ret_sz; 1777 mx_sc_elems = sg_bufflen / elem_sz; 1778 } 1779 schp->sglist_len = sg_bufflen; 1780 memset(schp->buffer, 0, sg_bufflen); 1781 return mx_sc_elems; /* number of scat_gath elements allocated */ 1782 } 1783 1784 #ifdef SG_ALLOW_DIO_CODE 1785 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ 1786 /* hopefully this generic code will moved to a library */ 1787 1788 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if 1789 - mapping of all pages not successful 1790 - any page is above max_pfn 1791 (i.e., either completely successful or fails) 1792 */ 1793 static int 1794 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, 1795 unsigned long uaddr, size_t count, int rw, 1796 unsigned long max_pfn) 1797 { 1798 int res, i, j; 1799 unsigned int nr_pages; 1800 struct page **pages; 1801 1802 nr_pages = ((uaddr & ~PAGE_MASK) + count + ~PAGE_MASK) >> PAGE_SHIFT; 1803 1804 /* User attempted Overflow! */ 1805 if ((uaddr + count) < uaddr) 1806 return -EINVAL; 1807 1808 /* Too big */ 1809 if (nr_pages > max_pages) 1810 return -ENOMEM; 1811 1812 /* Hmm? */ 1813 if (count == 0) 1814 return 0; 1815 1816 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) 1817 return -ENOMEM; 1818 1819 /* Try to fault in all of the necessary pages */ 1820 down_read(¤t->mm->mmap_sem); 1821 /* rw==READ means read from drive, write into memory area */ 1822 res = get_user_pages( 1823 current, 1824 current->mm, 1825 uaddr, 1826 nr_pages, 1827 rw == READ, 1828 0, /* don't force */ 1829 pages, 1830 NULL); 1831 up_read(¤t->mm->mmap_sem); 1832 1833 /* Errors and no page mapped should return here */ 1834 if (res < nr_pages) 1835 goto out_unmap; 1836 1837 for (i=0; i < nr_pages; i++) { 1838 /* FIXME: flush superflous for rw==READ, 1839 * probably wrong function for rw==WRITE 1840 */ 1841 flush_dcache_page(pages[i]); 1842 if (page_to_pfn(pages[i]) > max_pfn) 1843 goto out_unlock; 1844 /* ?? Is locking needed? I don't think so */ 1845 /* if (TestSetPageLocked(pages[i])) 1846 goto out_unlock; */ 1847 } 1848 1849 /* Populate the scatter/gather list */ 1850 sgl[0].page = pages[0]; 1851 sgl[0].offset = uaddr & ~PAGE_MASK; 1852 if (nr_pages > 1) { 1853 sgl[0].length = PAGE_SIZE - sgl[0].offset; 1854 count -= sgl[0].length; 1855 for (i=1; i < nr_pages ; i++) { 1856 sgl[i].offset = 0; 1857 sgl[i].page = pages[i]; 1858 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; 1859 count -= PAGE_SIZE; 1860 } 1861 } 1862 else { 1863 sgl[0].length = count; 1864 } 1865 1866 kfree(pages); 1867 return nr_pages; 1868 1869 out_unlock: 1870 /* for (j=0; j < i; j++) 1871 unlock_page(pages[j]); */ 1872 res = 0; 1873 out_unmap: 1874 if (res > 0) 1875 for (j=0; j < res; j++) 1876 page_cache_release(pages[j]); 1877 kfree(pages); 1878 return res; 1879 } 1880 1881 1882 /* And unmap them... */ 1883 static int 1884 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, 1885 int dirtied) 1886 { 1887 int i; 1888 1889 for (i=0; i < nr_pages; i++) { 1890 if (dirtied && !PageReserved(sgl[i].page)) 1891 SetPageDirty(sgl[i].page); 1892 /* unlock_page(sgl[i].page); */ 1893 /* FIXME: cache flush missing for rw==READ 1894 * FIXME: call the correct reference counting function 1895 */ 1896 page_cache_release(sgl[i].page); 1897 } 1898 1899 return 0; 1900 } 1901 1902 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ 1903 #endif 1904 1905 1906 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ 1907 static int 1908 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) 1909 { 1910 #ifdef SG_ALLOW_DIO_CODE 1911 sg_io_hdr_t *hp = &srp->header; 1912 Sg_scatter_hold *schp = &srp->data; 1913 int sg_tablesize = sfp->parentdp->sg_tablesize; 1914 struct scatterlist *sgl; 1915 int mx_sc_elems, res; 1916 struct scsi_device *sdev = sfp->parentdp->device; 1917 1918 if (((unsigned long)hp->dxferp & 1919 queue_dma_alignment(sdev->request_queue)) != 0) 1920 return 1; 1921 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1922 if (mx_sc_elems <= 0) { 1923 return 1; 1924 } 1925 sgl = (struct scatterlist *)schp->buffer; 1926 res = st_map_user_pages(sgl, mx_sc_elems, (unsigned long)hp->dxferp, dxfer_len, 1927 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0, ULONG_MAX); 1928 if (res <= 0) 1929 return 1; 1930 schp->k_use_sg = res; 1931 schp->dio_in_use = 1; 1932 hp->info |= SG_INFO_DIRECT_IO; 1933 return 0; 1934 #else 1935 return 1; 1936 #endif 1937 } 1938 1939 static int 1940 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1941 { 1942 int ret_sz; 1943 int blk_size = buff_size; 1944 unsigned char *p = NULL; 1945 1946 if ((blk_size < 0) || (!sfp)) 1947 return -EFAULT; 1948 if (0 == blk_size) 1949 ++blk_size; /* don't know why */ 1950 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1951 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); 1952 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1953 buff_size, blk_size)); 1954 if (blk_size <= SG_SCATTER_SZ) { 1955 p = sg_page_malloc(blk_size, sfp->low_dma, &ret_sz); 1956 if (!p) 1957 return -ENOMEM; 1958 if (blk_size == ret_sz) { /* got it on the first attempt */ 1959 schp->k_use_sg = 0; 1960 schp->buffer = p; 1961 schp->bufflen = blk_size; 1962 schp->b_malloc_len = blk_size; 1963 return 0; 1964 } 1965 } else { 1966 p = sg_page_malloc(SG_SCATTER_SZ, sfp->low_dma, &ret_sz); 1967 if (!p) 1968 return -ENOMEM; 1969 } 1970 /* Want some local declarations, so start new block ... */ 1971 { /* lets try and build a scatter gather list */ 1972 struct scatterlist *sclp; 1973 int k, rem_sz, num; 1974 int mx_sc_elems; 1975 int sg_tablesize = sfp->parentdp->sg_tablesize; 1976 int first = 1; 1977 1978 /* N.B. ret_sz carried into this block ... */ 1979 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1980 if (mx_sc_elems < 0) 1981 return mx_sc_elems; /* most likely -ENOMEM */ 1982 1983 for (k = 0, sclp = schp->buffer, rem_sz = blk_size; 1984 (rem_sz > 0) && (k < mx_sc_elems); 1985 ++k, rem_sz -= ret_sz, ++sclp) { 1986 if (first) 1987 first = 0; 1988 else { 1989 num = 1990 (rem_sz > 1991 SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz; 1992 p = sg_page_malloc(num, sfp->low_dma, &ret_sz); 1993 if (!p) 1994 break; 1995 } 1996 sclp->page = virt_to_page(p); 1997 sclp->offset = offset_in_page(p); 1998 sclp->length = ret_sz; 1999 2000 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n", 2001 k, sg_scatg2virt(sclp), ret_sz)); 2002 } /* end of for loop */ 2003 schp->k_use_sg = k; 2004 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz)); 2005 schp->bufflen = blk_size; 2006 if (rem_sz > 0) /* must have failed */ 2007 return -ENOMEM; 2008 } 2009 return 0; 2010 } 2011 2012 static int 2013 sg_write_xfer(Sg_request * srp) 2014 { 2015 sg_io_hdr_t *hp = &srp->header; 2016 Sg_scatter_hold *schp = &srp->data; 2017 int num_xfer = 0; 2018 int j, k, onum, usglen, ksglen, res; 2019 int iovec_count = (int) hp->iovec_count; 2020 int dxfer_dir = hp->dxfer_direction; 2021 unsigned char *p; 2022 unsigned char __user *up; 2023 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 2024 2025 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || 2026 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 2027 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); 2028 if (schp->bufflen < num_xfer) 2029 num_xfer = schp->bufflen; 2030 } 2031 if ((num_xfer <= 0) || (schp->dio_in_use) || 2032 (new_interface 2033 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 2034 return 0; 2035 2036 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 2037 num_xfer, iovec_count, schp->k_use_sg)); 2038 if (iovec_count) { 2039 onum = iovec_count; 2040 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 2041 return -EFAULT; 2042 } else 2043 onum = 1; 2044 2045 if (0 == schp->k_use_sg) { /* kernel has single buffer */ 2046 for (j = 0, p = schp->buffer; j < onum; ++j) { 2047 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); 2048 if (res) 2049 return res; 2050 usglen = (num_xfer > usglen) ? usglen : num_xfer; 2051 if (__copy_from_user(p, up, usglen)) 2052 return -EFAULT; 2053 p += usglen; 2054 num_xfer -= usglen; 2055 if (num_xfer <= 0) 2056 return 0; 2057 } 2058 } else { /* kernel using scatter gather list */ 2059 struct scatterlist *sclp = (struct scatterlist *) schp->buffer; 2060 2061 ksglen = (int) sclp->length; 2062 p = sg_scatg2virt(sclp); 2063 for (j = 0, k = 0; j < onum; ++j) { 2064 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); 2065 if (res) 2066 return res; 2067 2068 for (; p; ++sclp, ksglen = (int) sclp->length, 2069 p = sg_scatg2virt(sclp)) { 2070 if (usglen <= 0) 2071 break; 2072 if (ksglen > usglen) { 2073 if (usglen >= num_xfer) { 2074 if (__copy_from_user 2075 (p, up, num_xfer)) 2076 return -EFAULT; 2077 return 0; 2078 } 2079 if (__copy_from_user(p, up, usglen)) 2080 return -EFAULT; 2081 p += usglen; 2082 ksglen -= usglen; 2083 break; 2084 } else { 2085 if (ksglen >= num_xfer) { 2086 if (__copy_from_user 2087 (p, up, num_xfer)) 2088 return -EFAULT; 2089 return 0; 2090 } 2091 if (__copy_from_user(p, up, 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_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 2107 int wr_xf, int *countp, unsigned char __user **up) 2108 { 2109 int num_xfer = (int) hp->dxfer_len; 2110 unsigned char __user *p = hp->dxferp; 2111 int count; 2112 2113 if (0 == sg_num) { 2114 if (wr_xf && ('\0' == hp->interface_id)) 2115 count = (int) hp->flags; /* holds "old" input_size */ 2116 else 2117 count = num_xfer; 2118 } else { 2119 sg_iovec_t iovec; 2120 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) 2121 return -EFAULT; 2122 p = iovec.iov_base; 2123 count = (int) iovec.iov_len; 2124 } 2125 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) 2126 return -EFAULT; 2127 if (up) 2128 *up = p; 2129 if (countp) 2130 *countp = count; 2131 return 0; 2132 } 2133 2134 static void 2135 sg_remove_scat(Sg_scatter_hold * schp) 2136 { 2137 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 2138 if (schp->buffer && (schp->sglist_len > 0)) { 2139 struct scatterlist *sclp = (struct scatterlist *) schp->buffer; 2140 2141 if (schp->dio_in_use) { 2142 #ifdef SG_ALLOW_DIO_CODE 2143 st_unmap_user_pages(sclp, schp->k_use_sg, TRUE); 2144 #endif 2145 } else { 2146 int k; 2147 2148 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp); 2149 ++k, ++sclp) { 2150 SCSI_LOG_TIMEOUT(5, printk( 2151 "sg_remove_scat: k=%d, a=0x%p, len=%d\n", 2152 k, sg_scatg2virt(sclp), sclp->length)); 2153 sg_page_free(sg_scatg2virt(sclp), sclp->length); 2154 sclp->page = NULL; 2155 sclp->offset = 0; 2156 sclp->length = 0; 2157 } 2158 } 2159 sg_page_free(schp->buffer, schp->sglist_len); 2160 } else if (schp->buffer) 2161 sg_page_free(schp->buffer, schp->b_malloc_len); 2162 memset(schp, 0, sizeof (*schp)); 2163 } 2164 2165 static int 2166 sg_read_xfer(Sg_request * srp) 2167 { 2168 sg_io_hdr_t *hp = &srp->header; 2169 Sg_scatter_hold *schp = &srp->data; 2170 int num_xfer = 0; 2171 int j, k, onum, usglen, ksglen, res; 2172 int iovec_count = (int) hp->iovec_count; 2173 int dxfer_dir = hp->dxfer_direction; 2174 unsigned char *p; 2175 unsigned char __user *up; 2176 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 2177 2178 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) 2179 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 2180 num_xfer = hp->dxfer_len; 2181 if (schp->bufflen < num_xfer) 2182 num_xfer = schp->bufflen; 2183 } 2184 if ((num_xfer <= 0) || (schp->dio_in_use) || 2185 (new_interface 2186 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 2187 return 0; 2188 2189 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 2190 num_xfer, iovec_count, schp->k_use_sg)); 2191 if (iovec_count) { 2192 onum = iovec_count; 2193 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 2194 return -EFAULT; 2195 } else 2196 onum = 1; 2197 2198 if (0 == schp->k_use_sg) { /* kernel has single buffer */ 2199 for (j = 0, p = schp->buffer; j < onum; ++j) { 2200 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); 2201 if (res) 2202 return res; 2203 usglen = (num_xfer > usglen) ? usglen : num_xfer; 2204 if (__copy_to_user(up, p, usglen)) 2205 return -EFAULT; 2206 p += usglen; 2207 num_xfer -= usglen; 2208 if (num_xfer <= 0) 2209 return 0; 2210 } 2211 } else { /* kernel using scatter gather list */ 2212 struct scatterlist *sclp = (struct scatterlist *) schp->buffer; 2213 2214 ksglen = (int) sclp->length; 2215 p = sg_scatg2virt(sclp); 2216 for (j = 0, k = 0; j < onum; ++j) { 2217 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); 2218 if (res) 2219 return res; 2220 2221 for (; p; ++sclp, ksglen = (int) sclp->length, 2222 p = sg_scatg2virt(sclp)) { 2223 if (usglen <= 0) 2224 break; 2225 if (ksglen > usglen) { 2226 if (usglen >= num_xfer) { 2227 if (__copy_to_user 2228 (up, p, num_xfer)) 2229 return -EFAULT; 2230 return 0; 2231 } 2232 if (__copy_to_user(up, p, usglen)) 2233 return -EFAULT; 2234 p += usglen; 2235 ksglen -= usglen; 2236 break; 2237 } else { 2238 if (ksglen >= num_xfer) { 2239 if (__copy_to_user 2240 (up, p, num_xfer)) 2241 return -EFAULT; 2242 return 0; 2243 } 2244 if (__copy_to_user(up, p, ksglen)) 2245 return -EFAULT; 2246 up += ksglen; 2247 usglen -= ksglen; 2248 } 2249 ++k; 2250 if (k >= schp->k_use_sg) 2251 return 0; 2252 } 2253 } 2254 } 2255 return 0; 2256 } 2257 2258 static int 2259 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 2260 { 2261 Sg_scatter_hold *schp = &srp->data; 2262 2263 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 2264 num_read_xfer)); 2265 if ((!outp) || (num_read_xfer <= 0)) 2266 return 0; 2267 if (schp->k_use_sg > 0) { 2268 int k, num; 2269 struct scatterlist *sclp = (struct scatterlist *) schp->buffer; 2270 2271 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp); 2272 ++k, ++sclp) { 2273 num = (int) sclp->length; 2274 if (num > num_read_xfer) { 2275 if (__copy_to_user 2276 (outp, sg_scatg2virt(sclp), num_read_xfer)) 2277 return -EFAULT; 2278 break; 2279 } else { 2280 if (__copy_to_user 2281 (outp, sg_scatg2virt(sclp), num)) 2282 return -EFAULT; 2283 num_read_xfer -= num; 2284 if (num_read_xfer <= 0) 2285 break; 2286 outp += num; 2287 } 2288 } 2289 } else { 2290 if (__copy_to_user(outp, schp->buffer, num_read_xfer)) 2291 return -EFAULT; 2292 } 2293 return 0; 2294 } 2295 2296 static void 2297 sg_build_reserve(Sg_fd * sfp, int req_size) 2298 { 2299 Sg_scatter_hold *schp = &sfp->reserve; 2300 2301 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 2302 do { 2303 if (req_size < PAGE_SIZE) 2304 req_size = PAGE_SIZE; 2305 if (0 == sg_build_indirect(schp, sfp, req_size)) 2306 return; 2307 else 2308 sg_remove_scat(schp); 2309 req_size >>= 1; /* divide by 2 */ 2310 } while (req_size > (PAGE_SIZE / 2)); 2311 } 2312 2313 static void 2314 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 2315 { 2316 Sg_scatter_hold *req_schp = &srp->data; 2317 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2318 2319 srp->res_used = 1; 2320 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 2321 size = (size + 1) & (~1); /* round to even for aha1542 */ 2322 if (rsv_schp->k_use_sg > 0) { 2323 int k, num; 2324 int rem = size; 2325 struct scatterlist *sclp = 2326 (struct scatterlist *) rsv_schp->buffer; 2327 2328 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) { 2329 num = (int) sclp->length; 2330 if (rem <= num) { 2331 if (0 == k) { 2332 req_schp->k_use_sg = 0; 2333 req_schp->buffer = sg_scatg2virt(sclp); 2334 } else { 2335 sfp->save_scat_len = num; 2336 sclp->length = (unsigned) rem; 2337 req_schp->k_use_sg = k + 1; 2338 req_schp->sglist_len = 2339 rsv_schp->sglist_len; 2340 req_schp->buffer = rsv_schp->buffer; 2341 } 2342 req_schp->bufflen = size; 2343 req_schp->b_malloc_len = rsv_schp->b_malloc_len; 2344 break; 2345 } else 2346 rem -= num; 2347 } 2348 if (k >= rsv_schp->k_use_sg) 2349 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 2350 } else { 2351 req_schp->k_use_sg = 0; 2352 req_schp->bufflen = size; 2353 req_schp->buffer = rsv_schp->buffer; 2354 req_schp->b_malloc_len = rsv_schp->b_malloc_len; 2355 } 2356 } 2357 2358 static void 2359 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 2360 { 2361 Sg_scatter_hold *req_schp = &srp->data; 2362 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2363 2364 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 2365 (int) req_schp->k_use_sg)); 2366 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { 2367 struct scatterlist *sclp = 2368 (struct scatterlist *) rsv_schp->buffer; 2369 2370 if (sfp->save_scat_len > 0) 2371 (sclp + (req_schp->k_use_sg - 1))->length = 2372 (unsigned) sfp->save_scat_len; 2373 else 2374 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); 2375 } 2376 req_schp->k_use_sg = 0; 2377 req_schp->bufflen = 0; 2378 req_schp->buffer = NULL; 2379 req_schp->sglist_len = 0; 2380 sfp->save_scat_len = 0; 2381 srp->res_used = 0; 2382 } 2383 2384 static Sg_request * 2385 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 2386 { 2387 Sg_request *resp; 2388 unsigned long iflags; 2389 2390 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2391 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 2392 /* look for requests that are ready + not SG_IO owned */ 2393 if ((1 == resp->done) && (!resp->sg_io_owned) && 2394 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 2395 resp->done = 2; /* guard against other readers */ 2396 break; 2397 } 2398 } 2399 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2400 return resp; 2401 } 2402 2403 #ifdef CONFIG_SCSI_PROC_FS 2404 static Sg_request * 2405 sg_get_nth_request(Sg_fd * sfp, int nth) 2406 { 2407 Sg_request *resp; 2408 unsigned long iflags; 2409 int k; 2410 2411 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2412 for (k = 0, resp = sfp->headrp; resp && (k < nth); 2413 ++k, resp = resp->nextrp) ; 2414 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2415 return resp; 2416 } 2417 #endif 2418 2419 /* always adds to end of list */ 2420 static Sg_request * 2421 sg_add_request(Sg_fd * sfp) 2422 { 2423 int k; 2424 unsigned long iflags; 2425 Sg_request *resp; 2426 Sg_request *rp = sfp->req_arr; 2427 2428 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2429 resp = sfp->headrp; 2430 if (!resp) { 2431 memset(rp, 0, sizeof (Sg_request)); 2432 rp->parentfp = sfp; 2433 resp = rp; 2434 sfp->headrp = resp; 2435 } else { 2436 if (0 == sfp->cmd_q) 2437 resp = NULL; /* command queuing disallowed */ 2438 else { 2439 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2440 if (!rp->parentfp) 2441 break; 2442 } 2443 if (k < SG_MAX_QUEUE) { 2444 memset(rp, 0, sizeof (Sg_request)); 2445 rp->parentfp = sfp; 2446 while (resp->nextrp) 2447 resp = resp->nextrp; 2448 resp->nextrp = rp; 2449 resp = rp; 2450 } else 2451 resp = NULL; 2452 } 2453 } 2454 if (resp) { 2455 resp->nextrp = NULL; 2456 resp->header.duration = jiffies_to_msecs(jiffies); 2457 resp->my_cmdp = NULL; 2458 } 2459 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2460 return resp; 2461 } 2462 2463 /* Return of 1 for found; 0 for not found */ 2464 static int 2465 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2466 { 2467 Sg_request *prev_rp; 2468 Sg_request *rp; 2469 unsigned long iflags; 2470 int res = 0; 2471 2472 if ((!sfp) || (!srp) || (!sfp->headrp)) 2473 return res; 2474 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2475 if (srp->my_cmdp) 2476 srp->my_cmdp->upper_private_data = NULL; 2477 prev_rp = sfp->headrp; 2478 if (srp == prev_rp) { 2479 sfp->headrp = prev_rp->nextrp; 2480 prev_rp->parentfp = NULL; 2481 res = 1; 2482 } else { 2483 while ((rp = prev_rp->nextrp)) { 2484 if (srp == rp) { 2485 prev_rp->nextrp = rp->nextrp; 2486 rp->parentfp = NULL; 2487 res = 1; 2488 break; 2489 } 2490 prev_rp = rp; 2491 } 2492 } 2493 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2494 return res; 2495 } 2496 2497 #ifdef CONFIG_SCSI_PROC_FS 2498 static Sg_fd * 2499 sg_get_nth_sfp(Sg_device * sdp, int nth) 2500 { 2501 Sg_fd *resp; 2502 unsigned long iflags; 2503 int k; 2504 2505 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2506 for (k = 0, resp = sdp->headfp; resp && (k < nth); 2507 ++k, resp = resp->nextfp) ; 2508 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2509 return resp; 2510 } 2511 #endif 2512 2513 static Sg_fd * 2514 sg_add_sfp(Sg_device * sdp, int dev) 2515 { 2516 Sg_fd *sfp; 2517 unsigned long iflags; 2518 2519 sfp = (Sg_fd *) sg_page_malloc(sizeof (Sg_fd), 0, NULL); 2520 if (!sfp) 2521 return NULL; 2522 memset(sfp, 0, sizeof (Sg_fd)); 2523 init_waitqueue_head(&sfp->read_wait); 2524 rwlock_init(&sfp->rq_list_lock); 2525 2526 sfp->timeout = SG_DEFAULT_TIMEOUT; 2527 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2528 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2529 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2530 sdp->device->host->unchecked_isa_dma : 1; 2531 sfp->cmd_q = SG_DEF_COMMAND_Q; 2532 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2533 sfp->parentdp = sdp; 2534 write_lock_irqsave(&sg_dev_arr_lock, iflags); 2535 if (!sdp->headfp) 2536 sdp->headfp = sfp; 2537 else { /* add to tail of existing list */ 2538 Sg_fd *pfp = sdp->headfp; 2539 while (pfp->nextfp) 2540 pfp = pfp->nextfp; 2541 pfp->nextfp = sfp; 2542 } 2543 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2544 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2545 sg_build_reserve(sfp, sg_big_buff); 2546 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2547 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2548 return sfp; 2549 } 2550 2551 static void 2552 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2553 { 2554 Sg_fd *fp; 2555 Sg_fd *prev_fp; 2556 2557 prev_fp = sdp->headfp; 2558 if (sfp == prev_fp) 2559 sdp->headfp = prev_fp->nextfp; 2560 else { 2561 while ((fp = prev_fp->nextfp)) { 2562 if (sfp == fp) { 2563 prev_fp->nextfp = fp->nextfp; 2564 break; 2565 } 2566 prev_fp = fp; 2567 } 2568 } 2569 if (sfp->reserve.bufflen > 0) { 2570 SCSI_LOG_TIMEOUT(6, 2571 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2572 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); 2573 if (sfp->mmap_called) 2574 sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */ 2575 sg_remove_scat(&sfp->reserve); 2576 } 2577 sfp->parentdp = NULL; 2578 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); 2579 sg_page_free((char *) sfp, sizeof (Sg_fd)); 2580 } 2581 2582 /* Returns 0 in normal case, 1 when detached and sdp object removed */ 2583 static int 2584 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2585 { 2586 Sg_request *srp; 2587 Sg_request *tsrp; 2588 int dirty = 0; 2589 int res = 0; 2590 2591 for (srp = sfp->headrp; srp; srp = tsrp) { 2592 tsrp = srp->nextrp; 2593 if (sg_srp_done(srp, sfp)) 2594 sg_finish_rem_req(srp); 2595 else 2596 ++dirty; 2597 } 2598 if (0 == dirty) { 2599 unsigned long iflags; 2600 2601 write_lock_irqsave(&sg_dev_arr_lock, iflags); 2602 __sg_remove_sfp(sdp, sfp); 2603 if (sdp->detached && (NULL == sdp->headfp)) { 2604 int k, maxd; 2605 2606 maxd = sg_dev_max; 2607 for (k = 0; k < maxd; ++k) { 2608 if (sdp == sg_dev_arr[k]) 2609 break; 2610 } 2611 if (k < maxd) 2612 sg_dev_arr[k] = NULL; 2613 kfree((char *) sdp); 2614 res = 1; 2615 } 2616 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2617 } else { 2618 /* MOD_INC's to inhibit unloading sg and associated adapter driver */ 2619 /* only bump the access_count if we actually succeeded in 2620 * throwing another counter on the host module */ 2621 scsi_device_get(sdp->device); /* XXX: retval ignored? */ 2622 sfp->closed = 1; /* flag dirty state on this fd */ 2623 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", 2624 dirty)); 2625 } 2626 return res; 2627 } 2628 2629 static int 2630 sg_res_in_use(Sg_fd * sfp) 2631 { 2632 const Sg_request *srp; 2633 unsigned long iflags; 2634 2635 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2636 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2637 if (srp->res_used) 2638 break; 2639 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2640 return srp ? 1 : 0; 2641 } 2642 2643 /* If retSzp==NULL want exact size or fail */ 2644 static char * 2645 sg_page_malloc(int rqSz, int lowDma, int *retSzp) 2646 { 2647 char *resp = NULL; 2648 int page_mask; 2649 int order, a_size; 2650 int resSz = rqSz; 2651 2652 if (rqSz <= 0) 2653 return resp; 2654 2655 if (lowDma) 2656 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN; 2657 else 2658 page_mask = GFP_ATOMIC | __GFP_NOWARN; 2659 2660 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; 2661 order++, a_size <<= 1) ; 2662 resp = (char *) __get_free_pages(page_mask, order); 2663 while ((!resp) && order && retSzp) { 2664 --order; 2665 a_size >>= 1; /* divide by 2, until PAGE_SIZE */ 2666 resp = (char *) __get_free_pages(page_mask, order); /* try half */ 2667 resSz = a_size; 2668 } 2669 if (resp) { 2670 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2671 memset(resp, 0, resSz); 2672 if (retSzp) 2673 *retSzp = resSz; 2674 } 2675 return resp; 2676 } 2677 2678 static void 2679 sg_page_free(char *buff, int size) 2680 { 2681 int order, a_size; 2682 2683 if (!buff) 2684 return; 2685 for (order = 0, a_size = PAGE_SIZE; a_size < size; 2686 order++, a_size <<= 1) ; 2687 free_pages((unsigned long) buff, order); 2688 } 2689 2690 #ifndef MAINTENANCE_IN_CMD 2691 #define MAINTENANCE_IN_CMD 0xa3 2692 #endif 2693 2694 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, 2695 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, 2696 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, 2697 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD 2698 }; 2699 2700 static int 2701 sg_allow_access(unsigned char opcode, char dev_type) 2702 { 2703 int k; 2704 2705 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */ 2706 return 1; 2707 for (k = 0; k < sizeof (allow_ops); ++k) { 2708 if (opcode == allow_ops[k]) 2709 return 1; 2710 } 2711 return 0; 2712 } 2713 2714 #ifdef CONFIG_SCSI_PROC_FS 2715 static int 2716 sg_last_dev(void) 2717 { 2718 int k; 2719 unsigned long iflags; 2720 2721 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2722 for (k = sg_dev_max - 1; k >= 0; --k) 2723 if (sg_dev_arr[k] && sg_dev_arr[k]->device) 2724 break; 2725 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2726 return k + 1; /* origin 1 */ 2727 } 2728 #endif 2729 2730 static Sg_device * 2731 sg_get_dev(int dev) 2732 { 2733 Sg_device *sdp = NULL; 2734 unsigned long iflags; 2735 2736 if (sg_dev_arr && (dev >= 0)) { 2737 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2738 if (dev < sg_dev_max) 2739 sdp = sg_dev_arr[dev]; 2740 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2741 } 2742 return sdp; 2743 } 2744 2745 #ifdef CONFIG_SCSI_PROC_FS 2746 2747 static struct proc_dir_entry *sg_proc_sgp = NULL; 2748 2749 static char sg_proc_sg_dirname[] = "scsi/sg"; 2750 2751 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2752 2753 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2754 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2755 size_t count, loff_t *off); 2756 static struct file_operations adio_fops = { 2757 /* .owner, .read and .llseek added in sg_proc_init() */ 2758 .open = sg_proc_single_open_adio, 2759 .write = sg_proc_write_adio, 2760 .release = single_release, 2761 }; 2762 2763 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2764 static ssize_t sg_proc_write_dressz(struct file *filp, 2765 const char __user *buffer, size_t count, loff_t *off); 2766 static struct file_operations dressz_fops = { 2767 .open = sg_proc_single_open_dressz, 2768 .write = sg_proc_write_dressz, 2769 .release = single_release, 2770 }; 2771 2772 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2773 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2774 static struct file_operations version_fops = { 2775 .open = sg_proc_single_open_version, 2776 .release = single_release, 2777 }; 2778 2779 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2780 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2781 static struct file_operations devhdr_fops = { 2782 .open = sg_proc_single_open_devhdr, 2783 .release = single_release, 2784 }; 2785 2786 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2787 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2788 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2789 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2790 static void dev_seq_stop(struct seq_file *s, void *v); 2791 static struct file_operations dev_fops = { 2792 .open = sg_proc_open_dev, 2793 .release = seq_release, 2794 }; 2795 static struct seq_operations dev_seq_ops = { 2796 .start = dev_seq_start, 2797 .next = dev_seq_next, 2798 .stop = dev_seq_stop, 2799 .show = sg_proc_seq_show_dev, 2800 }; 2801 2802 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2803 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2804 static struct file_operations devstrs_fops = { 2805 .open = sg_proc_open_devstrs, 2806 .release = seq_release, 2807 }; 2808 static struct seq_operations devstrs_seq_ops = { 2809 .start = dev_seq_start, 2810 .next = dev_seq_next, 2811 .stop = dev_seq_stop, 2812 .show = sg_proc_seq_show_devstrs, 2813 }; 2814 2815 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2816 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2817 static struct file_operations debug_fops = { 2818 .open = sg_proc_open_debug, 2819 .release = seq_release, 2820 }; 2821 static struct seq_operations debug_seq_ops = { 2822 .start = dev_seq_start, 2823 .next = dev_seq_next, 2824 .stop = dev_seq_stop, 2825 .show = sg_proc_seq_show_debug, 2826 }; 2827 2828 2829 struct sg_proc_leaf { 2830 const char * name; 2831 struct file_operations * fops; 2832 }; 2833 2834 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2835 {"allow_dio", &adio_fops}, 2836 {"debug", &debug_fops}, 2837 {"def_reserved_size", &dressz_fops}, 2838 {"device_hdr", &devhdr_fops}, 2839 {"devices", &dev_fops}, 2840 {"device_strs", &devstrs_fops}, 2841 {"version", &version_fops} 2842 }; 2843 2844 static int 2845 sg_proc_init(void) 2846 { 2847 int k, mask; 2848 int num_leaves = 2849 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); 2850 struct proc_dir_entry *pdep; 2851 struct sg_proc_leaf * leaf; 2852 2853 sg_proc_sgp = create_proc_entry(sg_proc_sg_dirname, 2854 S_IFDIR | S_IRUGO | S_IXUGO, NULL); 2855 if (!sg_proc_sgp) 2856 return 1; 2857 for (k = 0; k < num_leaves; ++k) { 2858 leaf = &sg_proc_leaf_arr[k]; 2859 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2860 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp); 2861 if (pdep) { 2862 leaf->fops->owner = THIS_MODULE, 2863 leaf->fops->read = seq_read, 2864 leaf->fops->llseek = seq_lseek, 2865 pdep->proc_fops = leaf->fops; 2866 } 2867 } 2868 return 0; 2869 } 2870 2871 static void 2872 sg_proc_cleanup(void) 2873 { 2874 int k; 2875 int num_leaves = 2876 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); 2877 2878 if (!sg_proc_sgp) 2879 return; 2880 for (k = 0; k < num_leaves; ++k) 2881 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2882 remove_proc_entry(sg_proc_sg_dirname, NULL); 2883 } 2884 2885 2886 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2887 { 2888 seq_printf(s, "%d\n", *((int *)s->private)); 2889 return 0; 2890 } 2891 2892 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2893 { 2894 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2895 } 2896 2897 static ssize_t 2898 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2899 size_t count, loff_t *off) 2900 { 2901 int num; 2902 char buff[11]; 2903 2904 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2905 return -EACCES; 2906 num = (count < 10) ? count : 10; 2907 if (copy_from_user(buff, buffer, num)) 2908 return -EFAULT; 2909 buff[num] = '\0'; 2910 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2911 return count; 2912 } 2913 2914 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2915 { 2916 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2917 } 2918 2919 static ssize_t 2920 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2921 size_t count, loff_t *off) 2922 { 2923 int num; 2924 unsigned long k = ULONG_MAX; 2925 char buff[11]; 2926 2927 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2928 return -EACCES; 2929 num = (count < 10) ? count : 10; 2930 if (copy_from_user(buff, buffer, num)) 2931 return -EFAULT; 2932 buff[num] = '\0'; 2933 k = simple_strtoul(buff, NULL, 10); 2934 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2935 sg_big_buff = k; 2936 return count; 2937 } 2938 return -ERANGE; 2939 } 2940 2941 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2942 { 2943 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2944 sg_version_date); 2945 return 0; 2946 } 2947 2948 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2949 { 2950 return single_open(file, sg_proc_seq_show_version, NULL); 2951 } 2952 2953 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2954 { 2955 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2956 "online\n"); 2957 return 0; 2958 } 2959 2960 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2961 { 2962 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2963 } 2964 2965 struct sg_proc_deviter { 2966 loff_t index; 2967 size_t max; 2968 }; 2969 2970 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2971 { 2972 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2973 2974 if (! it) 2975 return NULL; 2976 if (NULL == sg_dev_arr) 2977 goto err1; 2978 it->index = *pos; 2979 it->max = sg_last_dev(); 2980 if (it->index >= it->max) 2981 goto err1; 2982 return it; 2983 err1: 2984 kfree(it); 2985 return NULL; 2986 } 2987 2988 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2989 { 2990 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2991 2992 *pos = ++it->index; 2993 return (it->index < it->max) ? it : NULL; 2994 } 2995 2996 static void dev_seq_stop(struct seq_file *s, void *v) 2997 { 2998 kfree (v); 2999 } 3000 3001 static int sg_proc_open_dev(struct inode *inode, struct file *file) 3002 { 3003 return seq_open(file, &dev_seq_ops); 3004 } 3005 3006 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 3007 { 3008 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 3009 Sg_device *sdp; 3010 struct scsi_device *scsidp; 3011 3012 sdp = it ? sg_get_dev(it->index) : NULL; 3013 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 3014 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 3015 scsidp->host->host_no, scsidp->channel, 3016 scsidp->id, scsidp->lun, (int) scsidp->type, 3017 1, 3018 (int) scsidp->queue_depth, 3019 (int) scsidp->device_busy, 3020 (int) scsi_device_online(scsidp)); 3021 else 3022 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 3023 return 0; 3024 } 3025 3026 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 3027 { 3028 return seq_open(file, &devstrs_seq_ops); 3029 } 3030 3031 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 3032 { 3033 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 3034 Sg_device *sdp; 3035 struct scsi_device *scsidp; 3036 3037 sdp = it ? sg_get_dev(it->index) : NULL; 3038 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 3039 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 3040 scsidp->vendor, scsidp->model, scsidp->rev); 3041 else 3042 seq_printf(s, "<no active device>\n"); 3043 return 0; 3044 } 3045 3046 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 3047 { 3048 int k, m, new_interface, blen, usg; 3049 Sg_request *srp; 3050 Sg_fd *fp; 3051 const sg_io_hdr_t *hp; 3052 const char * cp; 3053 unsigned int ms; 3054 3055 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { 3056 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 3057 "(res)sgat=%d low_dma=%d\n", k + 1, 3058 jiffies_to_msecs(fp->timeout), 3059 fp->reserve.bufflen, 3060 (int) fp->reserve.k_use_sg, 3061 (int) fp->low_dma); 3062 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 3063 (int) fp->cmd_q, (int) fp->force_packid, 3064 (int) fp->keep_orphan, (int) fp->closed); 3065 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { 3066 hp = &srp->header; 3067 new_interface = (hp->interface_id == '\0') ? 0 : 1; 3068 if (srp->res_used) { 3069 if (new_interface && 3070 (SG_FLAG_MMAP_IO & hp->flags)) 3071 cp = " mmap>> "; 3072 else 3073 cp = " rb>> "; 3074 } else { 3075 if (SG_INFO_DIRECT_IO_MASK & hp->info) 3076 cp = " dio>> "; 3077 else 3078 cp = " "; 3079 } 3080 seq_printf(s, cp); 3081 blen = srp->my_cmdp ? 3082 srp->my_cmdp->sr_bufflen : srp->data.bufflen; 3083 usg = srp->my_cmdp ? 3084 srp->my_cmdp->sr_use_sg : srp->data.k_use_sg; 3085 seq_printf(s, srp->done ? 3086 ((1 == srp->done) ? "rcv:" : "fin:") 3087 : (srp->my_cmdp ? "act:" : "prior:")); 3088 seq_printf(s, " id=%d blen=%d", 3089 srp->header.pack_id, blen); 3090 if (srp->done) 3091 seq_printf(s, " dur=%d", hp->duration); 3092 else { 3093 ms = jiffies_to_msecs(jiffies); 3094 seq_printf(s, " t_o/elap=%d/%d", 3095 (new_interface ? hp->timeout : 3096 jiffies_to_msecs(fp->timeout)), 3097 (ms > hp->duration ? ms - hp->duration : 0)); 3098 } 3099 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 3100 (int) srp->data.cmd_opcode); 3101 } 3102 if (0 == m) 3103 seq_printf(s, " No requests active\n"); 3104 } 3105 } 3106 3107 static int sg_proc_open_debug(struct inode *inode, struct file *file) 3108 { 3109 return seq_open(file, &debug_seq_ops); 3110 } 3111 3112 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 3113 { 3114 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 3115 Sg_device *sdp; 3116 3117 if (it && (0 == it->index)) { 3118 seq_printf(s, "dev_max(currently)=%d max_active_device=%d " 3119 "(origin 1)\n", sg_dev_max, (int)it->max); 3120 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 3121 } 3122 sdp = it ? sg_get_dev(it->index) : NULL; 3123 if (sdp) { 3124 struct scsi_device *scsidp = sdp->device; 3125 3126 if (NULL == scsidp) { 3127 seq_printf(s, "device %d detached ??\n", 3128 (int)it->index); 3129 return 0; 3130 } 3131 3132 if (sg_get_nth_sfp(sdp, 0)) { 3133 seq_printf(s, " >>> device=%s ", 3134 sdp->disk->disk_name); 3135 if (sdp->detached) 3136 seq_printf(s, "detached pending close "); 3137 else 3138 seq_printf 3139 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 3140 scsidp->host->host_no, 3141 scsidp->channel, scsidp->id, 3142 scsidp->lun, 3143 scsidp->host->hostt->emulated); 3144 seq_printf(s, " sg_tablesize=%d excl=%d\n", 3145 sdp->sg_tablesize, sdp->exclude); 3146 } 3147 sg_proc_debug_helper(s, sdp); 3148 } 3149 return 0; 3150 } 3151 3152 #endif /* CONFIG_SCSI_PROC_FS */ 3153 3154 module_init(init_sg); 3155 module_exit(exit_sg); 3156 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 3157