1 /* 2 * History: 3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), 4 * to allow user process control of SCSI devices. 5 * Development Sponsored by Killy Corp. NY NY 6 * 7 * Original driver (sg.c): 8 * Copyright (C) 1992 Lawrence Foard 9 * Version 2 and 3 extensions to driver: 10 * Copyright (C) 1998 - 2005 Douglas Gilbert 11 * 12 * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 */ 20 21 static int sg_version_num = 30533; /* 2 digits for each component */ 22 #define SG_VERSION_STR "3.5.33" 23 24 /* 25 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes: 26 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First 27 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING 28 * (otherwise the macros compile to empty statements). 29 * 30 */ 31 #include <linux/config.h> 32 #include <linux/module.h> 33 34 #include <linux/fs.h> 35 #include <linux/kernel.h> 36 #include <linux/sched.h> 37 #include <linux/string.h> 38 #include <linux/mm.h> 39 #include <linux/errno.h> 40 #include <linux/mtio.h> 41 #include <linux/ioctl.h> 42 #include <linux/fcntl.h> 43 #include <linux/init.h> 44 #include <linux/poll.h> 45 #include <linux/smp_lock.h> 46 #include <linux/moduleparam.h> 47 #include <linux/devfs_fs_kernel.h> 48 #include <linux/cdev.h> 49 #include <linux/seq_file.h> 50 #include <linux/blkdev.h> 51 #include <linux/delay.h> 52 #include <linux/scatterlist.h> 53 54 #include "scsi.h" 55 #include <scsi/scsi_dbg.h> 56 #include <scsi/scsi_host.h> 57 #include <scsi/scsi_driver.h> 58 #include <scsi/scsi_ioctl.h> 59 #include <scsi/sg.h> 60 61 #include "scsi_logging.h" 62 63 #ifdef CONFIG_SCSI_PROC_FS 64 #include <linux/proc_fs.h> 65 static char *sg_version_date = "20050908"; 66 67 static int sg_proc_init(void); 68 static void sg_proc_cleanup(void); 69 #endif 70 71 #ifndef LINUX_VERSION_CODE 72 #include <linux/version.h> 73 #endif /* LINUX_VERSION_CODE */ 74 75 #define SG_ALLOW_DIO_DEF 0 76 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */ 77 78 #define SG_MAX_DEVS 32768 79 80 /* 81 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 82 * Then when using 32 bit integers x * m may overflow during the calculation. 83 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 84 * calculates the same, but prevents the overflow when both m and d 85 * are "small" numbers (like HZ and USER_HZ). 86 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 87 * in 32 bits. 88 */ 89 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 90 91 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 92 93 int sg_big_buff = SG_DEF_RESERVED_SIZE; 94 /* N.B. This variable is readable and writeable via 95 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 96 of this size (or less if there is not enough memory) will be reserved 97 for use by this file descriptor. [Deprecated usage: this variable is also 98 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 99 the kernel (i.e. it is not a module).] */ 100 static int def_reserved_size = -1; /* picks up init parameter */ 101 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 102 103 #define SG_SECTOR_SZ 512 104 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) 105 106 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */ 107 108 static int sg_add(struct class_device *, struct class_interface *); 109 static void sg_remove(struct class_device *, struct class_interface *); 110 111 static Scsi_Request *dummy_cmdp; /* only used for sizeof */ 112 113 static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock 114 file descriptor list for device */ 115 116 static struct class_interface sg_interface = { 117 .add = sg_add, 118 .remove = sg_remove, 119 }; 120 121 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 122 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 123 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */ 124 unsigned bufflen; /* Size of (aggregate) data buffer */ 125 unsigned b_malloc_len; /* actual len malloc'ed in buffer */ 126 void *buffer; /* Data buffer or scatter list (k_use_sg>0) */ 127 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 128 unsigned char cmd_opcode; /* first byte of command */ 129 } Sg_scatter_hold; 130 131 struct sg_device; /* forward declarations */ 132 struct sg_fd; 133 134 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 135 Scsi_Request *my_cmdp; /* != 0 when request with lower levels */ 136 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 137 struct sg_fd *parentfp; /* NULL -> not in use */ 138 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 139 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 140 unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)]; 141 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 142 char orphan; /* 1 -> drop on sight, 0 -> normal */ 143 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 144 volatile char done; /* 0->before bh, 1->before read, 2->read */ 145 } Sg_request; 146 147 typedef struct sg_fd { /* holds the state of a file descriptor */ 148 struct sg_fd *nextfp; /* NULL when last opened fd on this device */ 149 struct sg_device *parentdp; /* owning device */ 150 wait_queue_head_t read_wait; /* queue read until command done */ 151 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 152 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 153 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 154 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 155 unsigned save_scat_len; /* original length of trunc. scat. element */ 156 Sg_request *headrp; /* head of request slist, NULL->empty */ 157 struct fasync_struct *async_qp; /* used by asynchronous notification */ 158 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 159 char low_dma; /* as in parent but possibly overridden to 1 */ 160 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 161 volatile char closed; /* 1 -> fd closed but request(s) outstanding */ 162 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 163 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ 164 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 165 char mmap_called; /* 0 -> mmap() never called on this fd */ 166 } Sg_fd; 167 168 typedef struct sg_device { /* holds the state of each scsi generic device */ 169 struct scsi_device *device; 170 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ 171 int sg_tablesize; /* adapter's max scatter-gather table size */ 172 Sg_fd *headfp; /* first open fd belonging to this device */ 173 volatile char detached; /* 0->attached, 1->detached pending removal */ 174 volatile char exclude; /* opened for exclusive access */ 175 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 176 struct gendisk *disk; 177 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 178 } Sg_device; 179 180 static int sg_fasync(int fd, struct file *filp, int mode); 181 static void sg_cmd_done(Scsi_Cmnd * SCpnt); /* tasklet or soft irq callback */ 182 static int sg_start_req(Sg_request * srp); 183 static void sg_finish_rem_req(Sg_request * srp); 184 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 185 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, 186 int tablesize); 187 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 188 Sg_request * srp); 189 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 190 int blocking, int read_only, Sg_request ** o_srp); 191 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 192 unsigned char *cmnd, int timeout, int blocking); 193 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 194 int wr_xf, int *countp, unsigned char __user **up); 195 static int sg_write_xfer(Sg_request * srp); 196 static int sg_read_xfer(Sg_request * srp); 197 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 198 static void sg_remove_scat(Sg_scatter_hold * schp); 199 static void sg_build_reserve(Sg_fd * sfp, int req_size); 200 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 201 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 202 static char *sg_page_malloc(int rqSz, int lowDma, int *retSzp); 203 static void sg_page_free(char *buff, int size); 204 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 205 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 206 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); 207 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 208 static Sg_request *sg_add_request(Sg_fd * sfp); 209 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 210 static int sg_res_in_use(Sg_fd * sfp); 211 static int sg_allow_access(unsigned char opcode, char dev_type); 212 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); 213 static Sg_device *sg_get_dev(int dev); 214 static inline unsigned char *sg_scatg2virt(const struct scatterlist *sclp); 215 #ifdef CONFIG_SCSI_PROC_FS 216 static int sg_last_dev(void); 217 #endif 218 219 static Sg_device **sg_dev_arr = NULL; 220 static int sg_dev_max; 221 static int sg_nr_dev; 222 223 #define SZ_SG_HEADER sizeof(struct sg_header) 224 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 225 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 226 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 227 228 static int 229 sg_open(struct inode *inode, struct file *filp) 230 { 231 int dev = iminor(inode); 232 int flags = filp->f_flags; 233 Sg_device *sdp; 234 Sg_fd *sfp; 235 int res; 236 int retval; 237 238 nonseekable_open(inode, filp); 239 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 240 sdp = sg_get_dev(dev); 241 if ((!sdp) || (!sdp->device)) 242 return -ENXIO; 243 if (sdp->detached) 244 return -ENODEV; 245 246 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 247 /* Prevent the device driver from vanishing while we sleep */ 248 retval = scsi_device_get(sdp->device); 249 if (retval) 250 return retval; 251 252 if (!((flags & O_NONBLOCK) || 253 scsi_block_when_processing_errors(sdp->device))) { 254 retval = -ENXIO; 255 /* we are in error recovery for this device */ 256 goto error_out; 257 } 258 259 if (flags & O_EXCL) { 260 if (O_RDONLY == (flags & O_ACCMODE)) { 261 retval = -EPERM; /* Can't lock it with read only access */ 262 goto error_out; 263 } 264 if (sdp->headfp && (flags & O_NONBLOCK)) { 265 retval = -EBUSY; 266 goto error_out; 267 } 268 res = 0; 269 __wait_event_interruptible(sdp->o_excl_wait, 270 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); 271 if (res) { 272 retval = res; /* -ERESTARTSYS because signal hit process */ 273 goto error_out; 274 } 275 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ 276 if (flags & O_NONBLOCK) { 277 retval = -EBUSY; 278 goto error_out; 279 } 280 res = 0; 281 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), 282 res); 283 if (res) { 284 retval = res; /* -ERESTARTSYS because signal hit process */ 285 goto error_out; 286 } 287 } 288 if (sdp->detached) { 289 retval = -ENODEV; 290 goto error_out; 291 } 292 if (!sdp->headfp) { /* no existing opens on this device */ 293 sdp->sgdebug = 0; 294 sdp->sg_tablesize = sdp->device->host->sg_tablesize; 295 } 296 if ((sfp = sg_add_sfp(sdp, dev))) 297 filp->private_data = sfp; 298 else { 299 if (flags & O_EXCL) 300 sdp->exclude = 0; /* undo if error */ 301 retval = -ENOMEM; 302 goto error_out; 303 } 304 return 0; 305 306 error_out: 307 scsi_device_put(sdp->device); 308 return retval; 309 } 310 311 /* Following function was formerly called 'sg_close' */ 312 static int 313 sg_release(struct inode *inode, struct file *filp) 314 { 315 Sg_device *sdp; 316 Sg_fd *sfp; 317 318 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 319 return -ENXIO; 320 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 321 sg_fasync(-1, filp, 0); /* remove filp from async notification list */ 322 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ 323 if (!sdp->detached) { 324 scsi_device_put(sdp->device); 325 } 326 sdp->exclude = 0; 327 wake_up_interruptible(&sdp->o_excl_wait); 328 } 329 return 0; 330 } 331 332 static ssize_t 333 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 334 { 335 Sg_device *sdp; 336 Sg_fd *sfp; 337 Sg_request *srp; 338 int req_pack_id = -1; 339 sg_io_hdr_t *hp; 340 struct sg_header *old_hdr = NULL; 341 int retval = 0; 342 343 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 344 return -ENXIO; 345 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 346 sdp->disk->disk_name, (int) count)); 347 if (!access_ok(VERIFY_WRITE, buf, count)) 348 return -EFAULT; 349 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 350 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 351 if (!old_hdr) 352 return -ENOMEM; 353 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 354 retval = -EFAULT; 355 goto free_old_hdr; 356 } 357 if (old_hdr->reply_len < 0) { 358 if (count >= SZ_SG_IO_HDR) { 359 sg_io_hdr_t *new_hdr; 360 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 361 if (!new_hdr) { 362 retval = -ENOMEM; 363 goto free_old_hdr; 364 } 365 retval =__copy_from_user 366 (new_hdr, buf, SZ_SG_IO_HDR); 367 req_pack_id = new_hdr->pack_id; 368 kfree(new_hdr); 369 if (retval) { 370 retval = -EFAULT; 371 goto free_old_hdr; 372 } 373 } 374 } else 375 req_pack_id = old_hdr->pack_id; 376 } 377 srp = sg_get_rq_mark(sfp, req_pack_id); 378 if (!srp) { /* now wait on packet to arrive */ 379 if (sdp->detached) { 380 retval = -ENODEV; 381 goto free_old_hdr; 382 } 383 if (filp->f_flags & O_NONBLOCK) { 384 retval = -EAGAIN; 385 goto free_old_hdr; 386 } 387 while (1) { 388 retval = 0; /* following macro beats race condition */ 389 __wait_event_interruptible(sfp->read_wait, 390 (sdp->detached || 391 (srp = sg_get_rq_mark(sfp, req_pack_id))), 392 retval); 393 if (sdp->detached) { 394 retval = -ENODEV; 395 goto free_old_hdr; 396 } 397 if (0 == retval) 398 break; 399 400 /* -ERESTARTSYS as signal hit process */ 401 goto free_old_hdr; 402 } 403 } 404 if (srp->header.interface_id != '\0') { 405 retval = sg_new_read(sfp, buf, count, srp); 406 goto free_old_hdr; 407 } 408 409 hp = &srp->header; 410 if (old_hdr == NULL) { 411 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 412 if (! old_hdr) { 413 retval = -ENOMEM; 414 goto free_old_hdr; 415 } 416 } 417 memset(old_hdr, 0, SZ_SG_HEADER); 418 old_hdr->reply_len = (int) hp->timeout; 419 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 420 old_hdr->pack_id = hp->pack_id; 421 old_hdr->twelve_byte = 422 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 423 old_hdr->target_status = hp->masked_status; 424 old_hdr->host_status = hp->host_status; 425 old_hdr->driver_status = hp->driver_status; 426 if ((CHECK_CONDITION & hp->masked_status) || 427 (DRIVER_SENSE & hp->driver_status)) 428 memcpy(old_hdr->sense_buffer, srp->sense_b, 429 sizeof (old_hdr->sense_buffer)); 430 switch (hp->host_status) { 431 /* This setup of 'result' is for backward compatibility and is best 432 ignored by the user who should use target, host + driver status */ 433 case DID_OK: 434 case DID_PASSTHROUGH: 435 case DID_SOFT_ERROR: 436 old_hdr->result = 0; 437 break; 438 case DID_NO_CONNECT: 439 case DID_BUS_BUSY: 440 case DID_TIME_OUT: 441 old_hdr->result = EBUSY; 442 break; 443 case DID_BAD_TARGET: 444 case DID_ABORT: 445 case DID_PARITY: 446 case DID_RESET: 447 case DID_BAD_INTR: 448 old_hdr->result = EIO; 449 break; 450 case DID_ERROR: 451 old_hdr->result = (srp->sense_b[0] == 0 && 452 hp->masked_status == GOOD) ? 0 : EIO; 453 break; 454 default: 455 old_hdr->result = EIO; 456 break; 457 } 458 459 /* Now copy the result back to the user buffer. */ 460 if (count >= SZ_SG_HEADER) { 461 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 462 retval = -EFAULT; 463 goto free_old_hdr; 464 } 465 buf += SZ_SG_HEADER; 466 if (count > old_hdr->reply_len) 467 count = old_hdr->reply_len; 468 if (count > SZ_SG_HEADER) { 469 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 470 retval = -EFAULT; 471 goto free_old_hdr; 472 } 473 } 474 } else 475 count = (old_hdr->result == 0) ? 0 : -EIO; 476 sg_finish_rem_req(srp); 477 retval = count; 478 free_old_hdr: 479 if (old_hdr) 480 kfree(old_hdr); 481 return retval; 482 } 483 484 static ssize_t 485 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 486 { 487 sg_io_hdr_t *hp = &srp->header; 488 int err = 0; 489 int len; 490 491 if (count < SZ_SG_IO_HDR) { 492 err = -EINVAL; 493 goto err_out; 494 } 495 hp->sb_len_wr = 0; 496 if ((hp->mx_sb_len > 0) && hp->sbp) { 497 if ((CHECK_CONDITION & hp->masked_status) || 498 (DRIVER_SENSE & hp->driver_status)) { 499 int sb_len = sizeof (dummy_cmdp->sr_sense_buffer); 500 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 501 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 502 len = (len > sb_len) ? sb_len : len; 503 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 504 err = -EFAULT; 505 goto err_out; 506 } 507 hp->sb_len_wr = len; 508 } 509 } 510 if (hp->masked_status || hp->host_status || hp->driver_status) 511 hp->info |= SG_INFO_CHECK; 512 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 513 err = -EFAULT; 514 goto err_out; 515 } 516 err = sg_read_xfer(srp); 517 err_out: 518 sg_finish_rem_req(srp); 519 return (0 == err) ? count : err; 520 } 521 522 static ssize_t 523 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 524 { 525 int mxsize, cmd_size, k; 526 int input_size, blocking; 527 unsigned char opcode; 528 Sg_device *sdp; 529 Sg_fd *sfp; 530 Sg_request *srp; 531 struct sg_header old_hdr; 532 sg_io_hdr_t *hp; 533 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)]; 534 535 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 536 return -ENXIO; 537 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 538 sdp->disk->disk_name, (int) count)); 539 if (sdp->detached) 540 return -ENODEV; 541 if (!((filp->f_flags & O_NONBLOCK) || 542 scsi_block_when_processing_errors(sdp->device))) 543 return -ENXIO; 544 545 if (!access_ok(VERIFY_READ, buf, count)) 546 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 547 if (count < SZ_SG_HEADER) 548 return -EIO; 549 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 550 return -EFAULT; 551 blocking = !(filp->f_flags & O_NONBLOCK); 552 if (old_hdr.reply_len < 0) 553 return sg_new_write(sfp, buf, count, blocking, 0, NULL); 554 if (count < (SZ_SG_HEADER + 6)) 555 return -EIO; /* The minimum scsi command length is 6 bytes. */ 556 557 if (!(srp = sg_add_request(sfp))) { 558 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 559 return -EDOM; 560 } 561 buf += SZ_SG_HEADER; 562 __get_user(opcode, buf); 563 if (sfp->next_cmd_len > 0) { 564 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 565 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 566 sfp->next_cmd_len = 0; 567 sg_remove_request(sfp, srp); 568 return -EIO; 569 } 570 cmd_size = sfp->next_cmd_len; 571 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 572 } else { 573 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 574 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 575 cmd_size = 12; 576 } 577 SCSI_LOG_TIMEOUT(4, printk( 578 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 579 /* Determine buffer size. */ 580 input_size = count - cmd_size; 581 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 582 mxsize -= SZ_SG_HEADER; 583 input_size -= SZ_SG_HEADER; 584 if (input_size < 0) { 585 sg_remove_request(sfp, srp); 586 return -EIO; /* User did not pass enough bytes for this command. */ 587 } 588 hp = &srp->header; 589 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 590 hp->cmd_len = (unsigned char) cmd_size; 591 hp->iovec_count = 0; 592 hp->mx_sb_len = 0; 593 if (input_size > 0) 594 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 595 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 596 else 597 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 598 hp->dxfer_len = mxsize; 599 hp->dxferp = (char __user *)buf + cmd_size; 600 hp->sbp = NULL; 601 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 602 hp->flags = input_size; /* structure abuse ... */ 603 hp->pack_id = old_hdr.pack_id; 604 hp->usr_ptr = NULL; 605 if (__copy_from_user(cmnd, buf, cmd_size)) 606 return -EFAULT; 607 /* 608 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 609 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 610 * is a non-zero input_size, so emit a warning. 611 */ 612 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) 613 if (printk_ratelimit()) 614 printk(KERN_WARNING 615 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" 616 "guessing data in;\n" KERN_WARNING " " 617 "program %s not setting count and/or reply_len properly\n", 618 old_hdr.reply_len - (int)SZ_SG_HEADER, 619 input_size, (unsigned int) cmnd[0], 620 current->comm); 621 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 622 return (k < 0) ? k : count; 623 } 624 625 static ssize_t 626 sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, 627 int blocking, int read_only, Sg_request ** o_srp) 628 { 629 int k; 630 Sg_request *srp; 631 sg_io_hdr_t *hp; 632 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)]; 633 int timeout; 634 unsigned long ul_timeout; 635 636 if (count < SZ_SG_IO_HDR) 637 return -EINVAL; 638 if (!access_ok(VERIFY_READ, buf, count)) 639 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 640 641 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 642 if (!(srp = sg_add_request(sfp))) { 643 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 644 return -EDOM; 645 } 646 hp = &srp->header; 647 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 648 sg_remove_request(sfp, srp); 649 return -EFAULT; 650 } 651 if (hp->interface_id != 'S') { 652 sg_remove_request(sfp, srp); 653 return -ENOSYS; 654 } 655 if (hp->flags & SG_FLAG_MMAP_IO) { 656 if (hp->dxfer_len > sfp->reserve.bufflen) { 657 sg_remove_request(sfp, srp); 658 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 659 } 660 if (hp->flags & SG_FLAG_DIRECT_IO) { 661 sg_remove_request(sfp, srp); 662 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 663 } 664 if (sg_res_in_use(sfp)) { 665 sg_remove_request(sfp, srp); 666 return -EBUSY; /* reserve buffer already being used */ 667 } 668 } 669 ul_timeout = msecs_to_jiffies(srp->header.timeout); 670 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 671 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 672 sg_remove_request(sfp, srp); 673 return -EMSGSIZE; 674 } 675 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 676 sg_remove_request(sfp, srp); 677 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 678 } 679 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 680 sg_remove_request(sfp, srp); 681 return -EFAULT; 682 } 683 if (read_only && 684 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) { 685 sg_remove_request(sfp, srp); 686 return -EPERM; 687 } 688 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 689 if (k < 0) 690 return k; 691 if (o_srp) 692 *o_srp = srp; 693 return count; 694 } 695 696 static int 697 sg_common_write(Sg_fd * sfp, Sg_request * srp, 698 unsigned char *cmnd, int timeout, int blocking) 699 { 700 int k; 701 Scsi_Request *SRpnt; 702 Sg_device *sdp = sfp->parentdp; 703 sg_io_hdr_t *hp = &srp->header; 704 request_queue_t *q; 705 706 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 707 hp->status = 0; 708 hp->masked_status = 0; 709 hp->msg_status = 0; 710 hp->info = 0; 711 hp->host_status = 0; 712 hp->driver_status = 0; 713 hp->resid = 0; 714 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 715 (int) cmnd[0], (int) hp->cmd_len)); 716 717 if ((k = sg_start_req(srp))) { 718 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k)); 719 sg_finish_rem_req(srp); 720 return k; /* probably out of space --> ENOMEM */ 721 } 722 if ((k = sg_write_xfer(srp))) { 723 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n")); 724 sg_finish_rem_req(srp); 725 return k; 726 } 727 if (sdp->detached) { 728 sg_finish_rem_req(srp); 729 return -ENODEV; 730 } 731 SRpnt = scsi_allocate_request(sdp->device, GFP_ATOMIC); 732 if (SRpnt == NULL) { 733 SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n")); 734 sg_finish_rem_req(srp); 735 return -ENOMEM; 736 } 737 738 srp->my_cmdp = SRpnt; 739 q = SRpnt->sr_device->request_queue; 740 SRpnt->sr_request->rq_disk = sdp->disk; 741 SRpnt->sr_sense_buffer[0] = 0; 742 SRpnt->sr_cmd_len = hp->cmd_len; 743 SRpnt->sr_use_sg = srp->data.k_use_sg; 744 SRpnt->sr_sglist_len = srp->data.sglist_len; 745 SRpnt->sr_bufflen = srp->data.bufflen; 746 SRpnt->sr_underflow = 0; 747 SRpnt->sr_buffer = srp->data.buffer; 748 switch (hp->dxfer_direction) { 749 case SG_DXFER_TO_FROM_DEV: 750 case SG_DXFER_FROM_DEV: 751 SRpnt->sr_data_direction = DMA_FROM_DEVICE; 752 break; 753 case SG_DXFER_TO_DEV: 754 SRpnt->sr_data_direction = DMA_TO_DEVICE; 755 break; 756 case SG_DXFER_UNKNOWN: 757 SRpnt->sr_data_direction = DMA_BIDIRECTIONAL; 758 break; 759 default: 760 SRpnt->sr_data_direction = DMA_NONE; 761 break; 762 } 763 SRpnt->upper_private_data = srp; 764 srp->data.k_use_sg = 0; 765 srp->data.sglist_len = 0; 766 srp->data.bufflen = 0; 767 srp->data.buffer = NULL; 768 hp->duration = jiffies_to_msecs(jiffies); 769 /* Now send everything of to mid-level. The next time we hear about this 770 packet is when sg_cmd_done() is called (i.e. a callback). */ 771 scsi_do_req(SRpnt, (void *) cmnd, 772 (void *) SRpnt->sr_buffer, hp->dxfer_len, 773 sg_cmd_done, timeout, SG_DEFAULT_RETRIES); 774 /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */ 775 return 0; 776 } 777 778 static int 779 sg_srp_done(Sg_request *srp, Sg_fd *sfp) 780 { 781 unsigned long iflags; 782 int done; 783 784 read_lock_irqsave(&sfp->rq_list_lock, iflags); 785 done = srp->done; 786 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 787 return done; 788 } 789 790 static int 791 sg_ioctl(struct inode *inode, struct file *filp, 792 unsigned int cmd_in, unsigned long arg) 793 { 794 void __user *p = (void __user *)arg; 795 int __user *ip = p; 796 int result, val, read_only; 797 Sg_device *sdp; 798 Sg_fd *sfp; 799 Sg_request *srp; 800 unsigned long iflags; 801 802 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 803 return -ENXIO; 804 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 805 sdp->disk->disk_name, (int) cmd_in)); 806 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 807 808 switch (cmd_in) { 809 case SG_IO: 810 { 811 int blocking = 1; /* ignore O_NONBLOCK flag */ 812 813 if (sdp->detached) 814 return -ENODEV; 815 if (!scsi_block_when_processing_errors(sdp->device)) 816 return -ENXIO; 817 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 818 return -EFAULT; 819 result = 820 sg_new_write(sfp, p, SZ_SG_IO_HDR, 821 blocking, read_only, &srp); 822 if (result < 0) 823 return result; 824 srp->sg_io_owned = 1; 825 while (1) { 826 result = 0; /* following macro to beat race condition */ 827 __wait_event_interruptible(sfp->read_wait, 828 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), 829 result); 830 if (sdp->detached) 831 return -ENODEV; 832 if (sfp->closed) 833 return 0; /* request packet dropped already */ 834 if (0 == result) 835 break; 836 srp->orphan = 1; 837 return result; /* -ERESTARTSYS because signal hit process */ 838 } 839 write_lock_irqsave(&sfp->rq_list_lock, iflags); 840 srp->done = 2; 841 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 842 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 843 return (result < 0) ? result : 0; 844 } 845 case SG_SET_TIMEOUT: 846 result = get_user(val, ip); 847 if (result) 848 return result; 849 if (val < 0) 850 return -EIO; 851 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 852 val = MULDIV (INT_MAX, USER_HZ, HZ); 853 sfp->timeout_user = val; 854 sfp->timeout = MULDIV (val, HZ, USER_HZ); 855 856 return 0; 857 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 858 /* strange ..., for backward compatibility */ 859 return sfp->timeout_user; 860 case SG_SET_FORCE_LOW_DMA: 861 result = get_user(val, ip); 862 if (result) 863 return result; 864 if (val) { 865 sfp->low_dma = 1; 866 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 867 val = (int) sfp->reserve.bufflen; 868 sg_remove_scat(&sfp->reserve); 869 sg_build_reserve(sfp, val); 870 } 871 } else { 872 if (sdp->detached) 873 return -ENODEV; 874 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 875 } 876 return 0; 877 case SG_GET_LOW_DMA: 878 return put_user((int) sfp->low_dma, ip); 879 case SG_GET_SCSI_ID: 880 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 881 return -EFAULT; 882 else { 883 sg_scsi_id_t __user *sg_idp = p; 884 885 if (sdp->detached) 886 return -ENODEV; 887 __put_user((int) sdp->device->host->host_no, 888 &sg_idp->host_no); 889 __put_user((int) sdp->device->channel, 890 &sg_idp->channel); 891 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 892 __put_user((int) sdp->device->lun, &sg_idp->lun); 893 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 894 __put_user((short) sdp->device->host->cmd_per_lun, 895 &sg_idp->h_cmd_per_lun); 896 __put_user((short) sdp->device->queue_depth, 897 &sg_idp->d_queue_depth); 898 __put_user(0, &sg_idp->unused[0]); 899 __put_user(0, &sg_idp->unused[1]); 900 return 0; 901 } 902 case SG_SET_FORCE_PACK_ID: 903 result = get_user(val, ip); 904 if (result) 905 return result; 906 sfp->force_packid = val ? 1 : 0; 907 return 0; 908 case SG_GET_PACK_ID: 909 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 910 return -EFAULT; 911 read_lock_irqsave(&sfp->rq_list_lock, iflags); 912 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 913 if ((1 == srp->done) && (!srp->sg_io_owned)) { 914 read_unlock_irqrestore(&sfp->rq_list_lock, 915 iflags); 916 __put_user(srp->header.pack_id, ip); 917 return 0; 918 } 919 } 920 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 921 __put_user(-1, ip); 922 return 0; 923 case SG_GET_NUM_WAITING: 924 read_lock_irqsave(&sfp->rq_list_lock, iflags); 925 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 926 if ((1 == srp->done) && (!srp->sg_io_owned)) 927 ++val; 928 } 929 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 930 return put_user(val, ip); 931 case SG_GET_SG_TABLESIZE: 932 return put_user(sdp->sg_tablesize, ip); 933 case SG_SET_RESERVED_SIZE: 934 result = get_user(val, ip); 935 if (result) 936 return result; 937 if (val < 0) 938 return -EINVAL; 939 if (val != sfp->reserve.bufflen) { 940 if (sg_res_in_use(sfp) || sfp->mmap_called) 941 return -EBUSY; 942 sg_remove_scat(&sfp->reserve); 943 sg_build_reserve(sfp, val); 944 } 945 return 0; 946 case SG_GET_RESERVED_SIZE: 947 val = (int) sfp->reserve.bufflen; 948 return put_user(val, ip); 949 case SG_SET_COMMAND_Q: 950 result = get_user(val, ip); 951 if (result) 952 return result; 953 sfp->cmd_q = val ? 1 : 0; 954 return 0; 955 case SG_GET_COMMAND_Q: 956 return put_user((int) sfp->cmd_q, ip); 957 case SG_SET_KEEP_ORPHAN: 958 result = get_user(val, ip); 959 if (result) 960 return result; 961 sfp->keep_orphan = val; 962 return 0; 963 case SG_GET_KEEP_ORPHAN: 964 return put_user((int) sfp->keep_orphan, ip); 965 case SG_NEXT_CMD_LEN: 966 result = get_user(val, ip); 967 if (result) 968 return result; 969 sfp->next_cmd_len = (val > 0) ? val : 0; 970 return 0; 971 case SG_GET_VERSION_NUM: 972 return put_user(sg_version_num, ip); 973 case SG_GET_ACCESS_COUNT: 974 /* faked - we don't have a real access count anymore */ 975 val = (sdp->device ? 1 : 0); 976 return put_user(val, ip); 977 case SG_GET_REQUEST_TABLE: 978 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 979 return -EFAULT; 980 else { 981 sg_req_info_t *rinfo; 982 unsigned int ms; 983 984 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 985 GFP_KERNEL); 986 if (!rinfo) 987 return -ENOMEM; 988 read_lock_irqsave(&sfp->rq_list_lock, iflags); 989 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 990 ++val, srp = srp ? srp->nextrp : srp) { 991 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 992 if (srp) { 993 rinfo[val].req_state = srp->done + 1; 994 rinfo[val].problem = 995 srp->header.masked_status & 996 srp->header.host_status & 997 srp->header.driver_status; 998 if (srp->done) 999 rinfo[val].duration = 1000 srp->header.duration; 1001 else { 1002 ms = jiffies_to_msecs(jiffies); 1003 rinfo[val].duration = 1004 (ms > srp->header.duration) ? 1005 (ms - srp->header.duration) : 0; 1006 } 1007 rinfo[val].orphan = srp->orphan; 1008 rinfo[val].sg_io_owned = 1009 srp->sg_io_owned; 1010 rinfo[val].pack_id = 1011 srp->header.pack_id; 1012 rinfo[val].usr_ptr = 1013 srp->header.usr_ptr; 1014 } 1015 } 1016 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1017 result = __copy_to_user(p, rinfo, 1018 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 1019 result = result ? -EFAULT : 0; 1020 kfree(rinfo); 1021 return result; 1022 } 1023 case SG_EMULATED_HOST: 1024 if (sdp->detached) 1025 return -ENODEV; 1026 return put_user(sdp->device->host->hostt->emulated, ip); 1027 case SG_SCSI_RESET: 1028 if (sdp->detached) 1029 return -ENODEV; 1030 if (filp->f_flags & O_NONBLOCK) { 1031 if (scsi_host_in_recovery(sdp->device->host)) 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; 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 sdev_printk(KERN_WARNING, scsidp, 1502 "Unable to attach sg device type=%d, minor " 1503 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); 1504 error = -ENODEV; 1505 goto out; 1506 } 1507 1508 static int 1509 sg_add(struct class_device *cl_dev, struct class_interface *cl_intf) 1510 { 1511 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); 1512 struct gendisk *disk; 1513 Sg_device *sdp = NULL; 1514 struct cdev * cdev = NULL; 1515 int error, k; 1516 1517 disk = alloc_disk(1); 1518 if (!disk) { 1519 printk(KERN_WARNING "alloc_disk failed\n"); 1520 return -ENOMEM; 1521 } 1522 disk->major = SCSI_GENERIC_MAJOR; 1523 1524 error = -ENOMEM; 1525 cdev = cdev_alloc(); 1526 if (!cdev) { 1527 printk(KERN_WARNING "cdev_alloc failed\n"); 1528 goto out; 1529 } 1530 cdev->owner = THIS_MODULE; 1531 cdev->ops = &sg_fops; 1532 1533 error = sg_alloc(disk, scsidp); 1534 if (error < 0) { 1535 printk(KERN_WARNING "sg_alloc failed\n"); 1536 goto out; 1537 } 1538 k = error; 1539 sdp = sg_dev_arr[k]; 1540 1541 devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k), 1542 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, 1543 "%s/generic", scsidp->devfs_name); 1544 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1); 1545 if (error) { 1546 devfs_remove("%s/generic", scsidp->devfs_name); 1547 goto out; 1548 } 1549 sdp->cdev = cdev; 1550 if (sg_sysfs_valid) { 1551 struct class_device * sg_class_member; 1552 1553 sg_class_member = class_device_create(sg_sysfs_class, NULL, 1554 MKDEV(SCSI_GENERIC_MAJOR, k), 1555 cl_dev->dev, "%s", 1556 disk->disk_name); 1557 if (IS_ERR(sg_class_member)) 1558 printk(KERN_WARNING "sg_add: " 1559 "class_device_create failed\n"); 1560 class_set_devdata(sg_class_member, sdp); 1561 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1562 &sg_class_member->kobj, "generic"); 1563 if (error) 1564 printk(KERN_ERR "sg_add: unable to make symlink " 1565 "'generic' back to sg%d\n", k); 1566 } else 1567 printk(KERN_WARNING "sg_add: sg_sys INvalid\n"); 1568 1569 sdev_printk(KERN_NOTICE, scsidp, 1570 "Attached scsi generic sg%d type %d\n", k,scsidp->type); 1571 1572 return 0; 1573 1574 out: 1575 put_disk(disk); 1576 if (cdev) 1577 cdev_del(cdev); 1578 return error; 1579 } 1580 1581 static void 1582 sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf) 1583 { 1584 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); 1585 Sg_device *sdp = NULL; 1586 unsigned long iflags; 1587 Sg_fd *sfp; 1588 Sg_fd *tsfp; 1589 Sg_request *srp; 1590 Sg_request *tsrp; 1591 int k, delay; 1592 1593 if (NULL == sg_dev_arr) 1594 return; 1595 delay = 0; 1596 write_lock_irqsave(&sg_dev_arr_lock, iflags); 1597 for (k = 0; k < sg_dev_max; k++) { 1598 sdp = sg_dev_arr[k]; 1599 if ((NULL == sdp) || (sdp->device != scsidp)) 1600 continue; /* dirty but lowers nesting */ 1601 if (sdp->headfp) { 1602 sdp->detached = 1; 1603 for (sfp = sdp->headfp; sfp; sfp = tsfp) { 1604 tsfp = sfp->nextfp; 1605 for (srp = sfp->headrp; srp; srp = tsrp) { 1606 tsrp = srp->nextrp; 1607 if (sfp->closed || (0 == sg_srp_done(srp, sfp))) 1608 sg_finish_rem_req(srp); 1609 } 1610 if (sfp->closed) { 1611 scsi_device_put(sdp->device); 1612 __sg_remove_sfp(sdp, sfp); 1613 } else { 1614 delay = 1; 1615 wake_up_interruptible(&sfp->read_wait); 1616 kill_fasync(&sfp->async_qp, SIGPOLL, 1617 POLL_HUP); 1618 } 1619 } 1620 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k)); 1621 if (NULL == sdp->headfp) { 1622 sg_dev_arr[k] = NULL; 1623 } 1624 } else { /* nothing active, simple case */ 1625 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k)); 1626 sg_dev_arr[k] = NULL; 1627 } 1628 sg_nr_dev--; 1629 break; 1630 } 1631 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 1632 1633 if (sdp) { 1634 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1635 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k)); 1636 cdev_del(sdp->cdev); 1637 sdp->cdev = NULL; 1638 devfs_remove("%s/generic", scsidp->devfs_name); 1639 put_disk(sdp->disk); 1640 sdp->disk = NULL; 1641 if (NULL == sdp->headfp) 1642 kfree((char *) sdp); 1643 } 1644 1645 if (delay) 1646 msleep(10); /* dirty detach so delay device destruction */ 1647 } 1648 1649 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 1650 * of sysfs parameters (which module_param doesn't yet support). 1651 * Sysfs parameters defined explicitly below. 1652 */ 1653 module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO); 1654 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1655 1656 MODULE_AUTHOR("Douglas Gilbert"); 1657 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1658 MODULE_LICENSE("GPL"); 1659 MODULE_VERSION(SG_VERSION_STR); 1660 1661 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1662 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1663 1664 static int __init 1665 init_sg(void) 1666 { 1667 int rc; 1668 1669 if (def_reserved_size >= 0) 1670 sg_big_buff = def_reserved_size; 1671 1672 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1673 SG_MAX_DEVS, "sg"); 1674 if (rc) 1675 return rc; 1676 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1677 if ( IS_ERR(sg_sysfs_class) ) { 1678 rc = PTR_ERR(sg_sysfs_class); 1679 goto err_out; 1680 } 1681 sg_sysfs_valid = 1; 1682 rc = scsi_register_interface(&sg_interface); 1683 if (0 == rc) { 1684 #ifdef CONFIG_SCSI_PROC_FS 1685 sg_proc_init(); 1686 #endif /* CONFIG_SCSI_PROC_FS */ 1687 return 0; 1688 } 1689 class_destroy(sg_sysfs_class); 1690 err_out: 1691 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1692 return rc; 1693 } 1694 1695 static void __exit 1696 exit_sg(void) 1697 { 1698 #ifdef CONFIG_SCSI_PROC_FS 1699 sg_proc_cleanup(); 1700 #endif /* CONFIG_SCSI_PROC_FS */ 1701 scsi_unregister_interface(&sg_interface); 1702 class_destroy(sg_sysfs_class); 1703 sg_sysfs_valid = 0; 1704 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1705 SG_MAX_DEVS); 1706 if (sg_dev_arr != NULL) { 1707 kfree((char *) sg_dev_arr); 1708 sg_dev_arr = NULL; 1709 } 1710 sg_dev_max = 0; 1711 } 1712 1713 static int 1714 sg_start_req(Sg_request * srp) 1715 { 1716 int res; 1717 Sg_fd *sfp = srp->parentfp; 1718 sg_io_hdr_t *hp = &srp->header; 1719 int dxfer_len = (int) hp->dxfer_len; 1720 int dxfer_dir = hp->dxfer_direction; 1721 Sg_scatter_hold *req_schp = &srp->data; 1722 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1723 1724 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); 1725 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1726 return 0; 1727 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && 1728 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && 1729 (!sfp->parentdp->device->host->unchecked_isa_dma)) { 1730 res = sg_build_direct(srp, sfp, dxfer_len); 1731 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ 1732 return res; 1733 } 1734 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) 1735 sg_link_reserve(sfp, srp, dxfer_len); 1736 else { 1737 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1738 if (res) { 1739 sg_remove_scat(req_schp); 1740 return res; 1741 } 1742 } 1743 return 0; 1744 } 1745 1746 static void 1747 sg_finish_rem_req(Sg_request * srp) 1748 { 1749 Sg_fd *sfp = srp->parentfp; 1750 Sg_scatter_hold *req_schp = &srp->data; 1751 1752 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1753 if (srp->res_used) 1754 sg_unlink_reserve(sfp, srp); 1755 else 1756 sg_remove_scat(req_schp); 1757 sg_remove_request(sfp, srp); 1758 } 1759 1760 static int 1761 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1762 { 1763 int ret_sz; 1764 int elem_sz = sizeof (struct scatterlist); 1765 int sg_bufflen = tablesize * elem_sz; 1766 int mx_sc_elems = tablesize; 1767 1768 schp->buffer = sg_page_malloc(sg_bufflen, sfp->low_dma, &ret_sz); 1769 if (!schp->buffer) 1770 return -ENOMEM; 1771 else if (ret_sz != sg_bufflen) { 1772 sg_bufflen = ret_sz; 1773 mx_sc_elems = sg_bufflen / elem_sz; 1774 } 1775 schp->sglist_len = sg_bufflen; 1776 memset(schp->buffer, 0, sg_bufflen); 1777 return mx_sc_elems; /* number of scat_gath elements allocated */ 1778 } 1779 1780 #ifdef SG_ALLOW_DIO_CODE 1781 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ 1782 /* hopefully this generic code will moved to a library */ 1783 1784 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if 1785 - mapping of all pages not successful 1786 - any page is above max_pfn 1787 (i.e., either completely successful or fails) 1788 */ 1789 static int 1790 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, 1791 unsigned long uaddr, size_t count, int rw, 1792 unsigned long max_pfn) 1793 { 1794 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 1795 unsigned long start = uaddr >> PAGE_SHIFT; 1796 const int nr_pages = end - start; 1797 int res, i, j; 1798 struct page **pages; 1799 1800 /* User attempted Overflow! */ 1801 if ((uaddr + count) < uaddr) 1802 return -EINVAL; 1803 1804 /* Too big */ 1805 if (nr_pages > max_pages) 1806 return -ENOMEM; 1807 1808 /* Hmm? */ 1809 if (count == 0) 1810 return 0; 1811 1812 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) 1813 return -ENOMEM; 1814 1815 /* Try to fault in all of the necessary pages */ 1816 down_read(¤t->mm->mmap_sem); 1817 /* rw==READ means read from drive, write into memory area */ 1818 res = get_user_pages( 1819 current, 1820 current->mm, 1821 uaddr, 1822 nr_pages, 1823 rw == READ, 1824 0, /* don't force */ 1825 pages, 1826 NULL); 1827 up_read(¤t->mm->mmap_sem); 1828 1829 /* Errors and no page mapped should return here */ 1830 if (res < nr_pages) 1831 goto out_unmap; 1832 1833 for (i=0; i < nr_pages; i++) { 1834 /* FIXME: flush superflous for rw==READ, 1835 * probably wrong function for rw==WRITE 1836 */ 1837 flush_dcache_page(pages[i]); 1838 if (page_to_pfn(pages[i]) > max_pfn) 1839 goto out_unlock; 1840 /* ?? Is locking needed? I don't think so */ 1841 /* if (TestSetPageLocked(pages[i])) 1842 goto out_unlock; */ 1843 } 1844 1845 /* Populate the scatter/gather list */ 1846 sgl[0].page = pages[0]; 1847 sgl[0].offset = uaddr & ~PAGE_MASK; 1848 if (nr_pages > 1) { 1849 sgl[0].length = PAGE_SIZE - sgl[0].offset; 1850 count -= sgl[0].length; 1851 for (i=1; i < nr_pages ; i++) { 1852 sgl[i].offset = 0; 1853 sgl[i].page = pages[i]; 1854 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; 1855 count -= PAGE_SIZE; 1856 } 1857 } 1858 else { 1859 sgl[0].length = count; 1860 } 1861 1862 kfree(pages); 1863 return nr_pages; 1864 1865 out_unlock: 1866 /* for (j=0; j < i; j++) 1867 unlock_page(pages[j]); */ 1868 res = 0; 1869 out_unmap: 1870 if (res > 0) 1871 for (j=0; j < res; j++) 1872 page_cache_release(pages[j]); 1873 kfree(pages); 1874 return res; 1875 } 1876 1877 1878 /* And unmap them... */ 1879 static int 1880 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, 1881 int dirtied) 1882 { 1883 int i; 1884 1885 for (i=0; i < nr_pages; i++) { 1886 struct page *page = sgl[i].page; 1887 1888 /* XXX: just for debug. Remove when PageReserved is removed */ 1889 BUG_ON(PageReserved(page)); 1890 if (dirtied) 1891 SetPageDirty(page); 1892 /* unlock_page(page); */ 1893 /* FIXME: cache flush missing for rw==READ 1894 * FIXME: call the correct reference counting function 1895 */ 1896 page_cache_release(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 sg_set_buf(sclp, p, ret_sz); 1997 1998 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n", 1999 k, sg_scatg2virt(sclp), ret_sz)); 2000 } /* end of for loop */ 2001 schp->k_use_sg = k; 2002 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz)); 2003 schp->bufflen = blk_size; 2004 if (rem_sz > 0) /* must have failed */ 2005 return -ENOMEM; 2006 } 2007 return 0; 2008 } 2009 2010 static int 2011 sg_write_xfer(Sg_request * srp) 2012 { 2013 sg_io_hdr_t *hp = &srp->header; 2014 Sg_scatter_hold *schp = &srp->data; 2015 int num_xfer = 0; 2016 int j, k, onum, usglen, ksglen, res; 2017 int iovec_count = (int) hp->iovec_count; 2018 int dxfer_dir = hp->dxfer_direction; 2019 unsigned char *p; 2020 unsigned char __user *up; 2021 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 2022 2023 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || 2024 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 2025 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); 2026 if (schp->bufflen < num_xfer) 2027 num_xfer = schp->bufflen; 2028 } 2029 if ((num_xfer <= 0) || (schp->dio_in_use) || 2030 (new_interface 2031 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 2032 return 0; 2033 2034 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 2035 num_xfer, iovec_count, schp->k_use_sg)); 2036 if (iovec_count) { 2037 onum = iovec_count; 2038 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 2039 return -EFAULT; 2040 } else 2041 onum = 1; 2042 2043 if (0 == schp->k_use_sg) { /* kernel has single buffer */ 2044 for (j = 0, p = schp->buffer; j < onum; ++j) { 2045 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); 2046 if (res) 2047 return res; 2048 usglen = (num_xfer > usglen) ? usglen : num_xfer; 2049 if (__copy_from_user(p, up, usglen)) 2050 return -EFAULT; 2051 p += usglen; 2052 num_xfer -= usglen; 2053 if (num_xfer <= 0) 2054 return 0; 2055 } 2056 } else { /* kernel using scatter gather list */ 2057 struct scatterlist *sclp = (struct scatterlist *) schp->buffer; 2058 2059 ksglen = (int) sclp->length; 2060 p = sg_scatg2virt(sclp); 2061 for (j = 0, k = 0; j < onum; ++j) { 2062 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); 2063 if (res) 2064 return res; 2065 2066 for (; p; ++sclp, ksglen = (int) sclp->length, 2067 p = sg_scatg2virt(sclp)) { 2068 if (usglen <= 0) 2069 break; 2070 if (ksglen > usglen) { 2071 if (usglen >= num_xfer) { 2072 if (__copy_from_user 2073 (p, up, num_xfer)) 2074 return -EFAULT; 2075 return 0; 2076 } 2077 if (__copy_from_user(p, up, usglen)) 2078 return -EFAULT; 2079 p += usglen; 2080 ksglen -= usglen; 2081 break; 2082 } else { 2083 if (ksglen >= num_xfer) { 2084 if (__copy_from_user 2085 (p, up, num_xfer)) 2086 return -EFAULT; 2087 return 0; 2088 } 2089 if (__copy_from_user(p, up, ksglen)) 2090 return -EFAULT; 2091 up += ksglen; 2092 usglen -= ksglen; 2093 } 2094 ++k; 2095 if (k >= schp->k_use_sg) 2096 return 0; 2097 } 2098 } 2099 } 2100 return 0; 2101 } 2102 2103 static int 2104 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, 2105 int wr_xf, int *countp, unsigned char __user **up) 2106 { 2107 int num_xfer = (int) hp->dxfer_len; 2108 unsigned char __user *p = hp->dxferp; 2109 int count; 2110 2111 if (0 == sg_num) { 2112 if (wr_xf && ('\0' == hp->interface_id)) 2113 count = (int) hp->flags; /* holds "old" input_size */ 2114 else 2115 count = num_xfer; 2116 } else { 2117 sg_iovec_t iovec; 2118 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) 2119 return -EFAULT; 2120 p = iovec.iov_base; 2121 count = (int) iovec.iov_len; 2122 } 2123 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) 2124 return -EFAULT; 2125 if (up) 2126 *up = p; 2127 if (countp) 2128 *countp = count; 2129 return 0; 2130 } 2131 2132 static void 2133 sg_remove_scat(Sg_scatter_hold * schp) 2134 { 2135 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 2136 if (schp->buffer && (schp->sglist_len > 0)) { 2137 struct scatterlist *sclp = (struct scatterlist *) schp->buffer; 2138 2139 if (schp->dio_in_use) { 2140 #ifdef SG_ALLOW_DIO_CODE 2141 st_unmap_user_pages(sclp, schp->k_use_sg, TRUE); 2142 #endif 2143 } else { 2144 int k; 2145 2146 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp); 2147 ++k, ++sclp) { 2148 SCSI_LOG_TIMEOUT(5, printk( 2149 "sg_remove_scat: k=%d, a=0x%p, len=%d\n", 2150 k, sg_scatg2virt(sclp), sclp->length)); 2151 sg_page_free(sg_scatg2virt(sclp), sclp->length); 2152 sclp->page = NULL; 2153 sclp->offset = 0; 2154 sclp->length = 0; 2155 } 2156 } 2157 sg_page_free(schp->buffer, schp->sglist_len); 2158 } else if (schp->buffer) 2159 sg_page_free(schp->buffer, schp->b_malloc_len); 2160 memset(schp, 0, sizeof (*schp)); 2161 } 2162 2163 static int 2164 sg_read_xfer(Sg_request * srp) 2165 { 2166 sg_io_hdr_t *hp = &srp->header; 2167 Sg_scatter_hold *schp = &srp->data; 2168 int num_xfer = 0; 2169 int j, k, onum, usglen, ksglen, res; 2170 int iovec_count = (int) hp->iovec_count; 2171 int dxfer_dir = hp->dxfer_direction; 2172 unsigned char *p; 2173 unsigned char __user *up; 2174 int new_interface = ('\0' == hp->interface_id) ? 0 : 1; 2175 2176 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) 2177 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { 2178 num_xfer = hp->dxfer_len; 2179 if (schp->bufflen < num_xfer) 2180 num_xfer = schp->bufflen; 2181 } 2182 if ((num_xfer <= 0) || (schp->dio_in_use) || 2183 (new_interface 2184 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) 2185 return 0; 2186 2187 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", 2188 num_xfer, iovec_count, schp->k_use_sg)); 2189 if (iovec_count) { 2190 onum = iovec_count; 2191 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) 2192 return -EFAULT; 2193 } else 2194 onum = 1; 2195 2196 if (0 == schp->k_use_sg) { /* kernel has single buffer */ 2197 for (j = 0, p = schp->buffer; j < onum; ++j) { 2198 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); 2199 if (res) 2200 return res; 2201 usglen = (num_xfer > usglen) ? usglen : num_xfer; 2202 if (__copy_to_user(up, p, usglen)) 2203 return -EFAULT; 2204 p += usglen; 2205 num_xfer -= usglen; 2206 if (num_xfer <= 0) 2207 return 0; 2208 } 2209 } else { /* kernel using scatter gather list */ 2210 struct scatterlist *sclp = (struct scatterlist *) schp->buffer; 2211 2212 ksglen = (int) sclp->length; 2213 p = sg_scatg2virt(sclp); 2214 for (j = 0, k = 0; j < onum; ++j) { 2215 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); 2216 if (res) 2217 return res; 2218 2219 for (; p; ++sclp, ksglen = (int) sclp->length, 2220 p = sg_scatg2virt(sclp)) { 2221 if (usglen <= 0) 2222 break; 2223 if (ksglen > usglen) { 2224 if (usglen >= num_xfer) { 2225 if (__copy_to_user 2226 (up, p, num_xfer)) 2227 return -EFAULT; 2228 return 0; 2229 } 2230 if (__copy_to_user(up, p, usglen)) 2231 return -EFAULT; 2232 p += usglen; 2233 ksglen -= usglen; 2234 break; 2235 } else { 2236 if (ksglen >= num_xfer) { 2237 if (__copy_to_user 2238 (up, p, num_xfer)) 2239 return -EFAULT; 2240 return 0; 2241 } 2242 if (__copy_to_user(up, p, ksglen)) 2243 return -EFAULT; 2244 up += ksglen; 2245 usglen -= ksglen; 2246 } 2247 ++k; 2248 if (k >= schp->k_use_sg) 2249 return 0; 2250 } 2251 } 2252 } 2253 return 0; 2254 } 2255 2256 static int 2257 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 2258 { 2259 Sg_scatter_hold *schp = &srp->data; 2260 2261 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 2262 num_read_xfer)); 2263 if ((!outp) || (num_read_xfer <= 0)) 2264 return 0; 2265 if (schp->k_use_sg > 0) { 2266 int k, num; 2267 struct scatterlist *sclp = (struct scatterlist *) schp->buffer; 2268 2269 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp); 2270 ++k, ++sclp) { 2271 num = (int) sclp->length; 2272 if (num > num_read_xfer) { 2273 if (__copy_to_user 2274 (outp, sg_scatg2virt(sclp), num_read_xfer)) 2275 return -EFAULT; 2276 break; 2277 } else { 2278 if (__copy_to_user 2279 (outp, sg_scatg2virt(sclp), num)) 2280 return -EFAULT; 2281 num_read_xfer -= num; 2282 if (num_read_xfer <= 0) 2283 break; 2284 outp += num; 2285 } 2286 } 2287 } else { 2288 if (__copy_to_user(outp, schp->buffer, num_read_xfer)) 2289 return -EFAULT; 2290 } 2291 return 0; 2292 } 2293 2294 static void 2295 sg_build_reserve(Sg_fd * sfp, int req_size) 2296 { 2297 Sg_scatter_hold *schp = &sfp->reserve; 2298 2299 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 2300 do { 2301 if (req_size < PAGE_SIZE) 2302 req_size = PAGE_SIZE; 2303 if (0 == sg_build_indirect(schp, sfp, req_size)) 2304 return; 2305 else 2306 sg_remove_scat(schp); 2307 req_size >>= 1; /* divide by 2 */ 2308 } while (req_size > (PAGE_SIZE / 2)); 2309 } 2310 2311 static void 2312 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 2313 { 2314 Sg_scatter_hold *req_schp = &srp->data; 2315 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2316 2317 srp->res_used = 1; 2318 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 2319 size = (size + 1) & (~1); /* round to even for aha1542 */ 2320 if (rsv_schp->k_use_sg > 0) { 2321 int k, num; 2322 int rem = size; 2323 struct scatterlist *sclp = 2324 (struct scatterlist *) rsv_schp->buffer; 2325 2326 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) { 2327 num = (int) sclp->length; 2328 if (rem <= num) { 2329 if (0 == k) { 2330 req_schp->k_use_sg = 0; 2331 req_schp->buffer = sg_scatg2virt(sclp); 2332 } else { 2333 sfp->save_scat_len = num; 2334 sclp->length = (unsigned) rem; 2335 req_schp->k_use_sg = k + 1; 2336 req_schp->sglist_len = 2337 rsv_schp->sglist_len; 2338 req_schp->buffer = rsv_schp->buffer; 2339 } 2340 req_schp->bufflen = size; 2341 req_schp->b_malloc_len = rsv_schp->b_malloc_len; 2342 break; 2343 } else 2344 rem -= num; 2345 } 2346 if (k >= rsv_schp->k_use_sg) 2347 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 2348 } else { 2349 req_schp->k_use_sg = 0; 2350 req_schp->bufflen = size; 2351 req_schp->buffer = rsv_schp->buffer; 2352 req_schp->b_malloc_len = rsv_schp->b_malloc_len; 2353 } 2354 } 2355 2356 static void 2357 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 2358 { 2359 Sg_scatter_hold *req_schp = &srp->data; 2360 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2361 2362 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 2363 (int) req_schp->k_use_sg)); 2364 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { 2365 struct scatterlist *sclp = 2366 (struct scatterlist *) rsv_schp->buffer; 2367 2368 if (sfp->save_scat_len > 0) 2369 (sclp + (req_schp->k_use_sg - 1))->length = 2370 (unsigned) sfp->save_scat_len; 2371 else 2372 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); 2373 } 2374 req_schp->k_use_sg = 0; 2375 req_schp->bufflen = 0; 2376 req_schp->buffer = NULL; 2377 req_schp->sglist_len = 0; 2378 sfp->save_scat_len = 0; 2379 srp->res_used = 0; 2380 } 2381 2382 static Sg_request * 2383 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 2384 { 2385 Sg_request *resp; 2386 unsigned long iflags; 2387 2388 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2389 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 2390 /* look for requests that are ready + not SG_IO owned */ 2391 if ((1 == resp->done) && (!resp->sg_io_owned) && 2392 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 2393 resp->done = 2; /* guard against other readers */ 2394 break; 2395 } 2396 } 2397 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2398 return resp; 2399 } 2400 2401 #ifdef CONFIG_SCSI_PROC_FS 2402 static Sg_request * 2403 sg_get_nth_request(Sg_fd * sfp, int nth) 2404 { 2405 Sg_request *resp; 2406 unsigned long iflags; 2407 int k; 2408 2409 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2410 for (k = 0, resp = sfp->headrp; resp && (k < nth); 2411 ++k, resp = resp->nextrp) ; 2412 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2413 return resp; 2414 } 2415 #endif 2416 2417 /* always adds to end of list */ 2418 static Sg_request * 2419 sg_add_request(Sg_fd * sfp) 2420 { 2421 int k; 2422 unsigned long iflags; 2423 Sg_request *resp; 2424 Sg_request *rp = sfp->req_arr; 2425 2426 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2427 resp = sfp->headrp; 2428 if (!resp) { 2429 memset(rp, 0, sizeof (Sg_request)); 2430 rp->parentfp = sfp; 2431 resp = rp; 2432 sfp->headrp = resp; 2433 } else { 2434 if (0 == sfp->cmd_q) 2435 resp = NULL; /* command queuing disallowed */ 2436 else { 2437 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2438 if (!rp->parentfp) 2439 break; 2440 } 2441 if (k < SG_MAX_QUEUE) { 2442 memset(rp, 0, sizeof (Sg_request)); 2443 rp->parentfp = sfp; 2444 while (resp->nextrp) 2445 resp = resp->nextrp; 2446 resp->nextrp = rp; 2447 resp = rp; 2448 } else 2449 resp = NULL; 2450 } 2451 } 2452 if (resp) { 2453 resp->nextrp = NULL; 2454 resp->header.duration = jiffies_to_msecs(jiffies); 2455 resp->my_cmdp = NULL; 2456 } 2457 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2458 return resp; 2459 } 2460 2461 /* Return of 1 for found; 0 for not found */ 2462 static int 2463 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2464 { 2465 Sg_request *prev_rp; 2466 Sg_request *rp; 2467 unsigned long iflags; 2468 int res = 0; 2469 2470 if ((!sfp) || (!srp) || (!sfp->headrp)) 2471 return res; 2472 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2473 if (srp->my_cmdp) 2474 srp->my_cmdp->upper_private_data = NULL; 2475 prev_rp = sfp->headrp; 2476 if (srp == prev_rp) { 2477 sfp->headrp = prev_rp->nextrp; 2478 prev_rp->parentfp = NULL; 2479 res = 1; 2480 } else { 2481 while ((rp = prev_rp->nextrp)) { 2482 if (srp == rp) { 2483 prev_rp->nextrp = rp->nextrp; 2484 rp->parentfp = NULL; 2485 res = 1; 2486 break; 2487 } 2488 prev_rp = rp; 2489 } 2490 } 2491 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2492 return res; 2493 } 2494 2495 #ifdef CONFIG_SCSI_PROC_FS 2496 static Sg_fd * 2497 sg_get_nth_sfp(Sg_device * sdp, int nth) 2498 { 2499 Sg_fd *resp; 2500 unsigned long iflags; 2501 int k; 2502 2503 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2504 for (k = 0, resp = sdp->headfp; resp && (k < nth); 2505 ++k, resp = resp->nextfp) ; 2506 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2507 return resp; 2508 } 2509 #endif 2510 2511 static Sg_fd * 2512 sg_add_sfp(Sg_device * sdp, int dev) 2513 { 2514 Sg_fd *sfp; 2515 unsigned long iflags; 2516 2517 sfp = (Sg_fd *) sg_page_malloc(sizeof (Sg_fd), 0, NULL); 2518 if (!sfp) 2519 return NULL; 2520 memset(sfp, 0, sizeof (Sg_fd)); 2521 init_waitqueue_head(&sfp->read_wait); 2522 rwlock_init(&sfp->rq_list_lock); 2523 2524 sfp->timeout = SG_DEFAULT_TIMEOUT; 2525 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2526 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2527 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2528 sdp->device->host->unchecked_isa_dma : 1; 2529 sfp->cmd_q = SG_DEF_COMMAND_Q; 2530 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2531 sfp->parentdp = sdp; 2532 write_lock_irqsave(&sg_dev_arr_lock, iflags); 2533 if (!sdp->headfp) 2534 sdp->headfp = sfp; 2535 else { /* add to tail of existing list */ 2536 Sg_fd *pfp = sdp->headfp; 2537 while (pfp->nextfp) 2538 pfp = pfp->nextfp; 2539 pfp->nextfp = sfp; 2540 } 2541 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2542 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2543 sg_build_reserve(sfp, sg_big_buff); 2544 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2545 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2546 return sfp; 2547 } 2548 2549 static void 2550 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2551 { 2552 Sg_fd *fp; 2553 Sg_fd *prev_fp; 2554 2555 prev_fp = sdp->headfp; 2556 if (sfp == prev_fp) 2557 sdp->headfp = prev_fp->nextfp; 2558 else { 2559 while ((fp = prev_fp->nextfp)) { 2560 if (sfp == fp) { 2561 prev_fp->nextfp = fp->nextfp; 2562 break; 2563 } 2564 prev_fp = fp; 2565 } 2566 } 2567 if (sfp->reserve.bufflen > 0) { 2568 SCSI_LOG_TIMEOUT(6, 2569 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2570 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); 2571 if (sfp->mmap_called) 2572 sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */ 2573 sg_remove_scat(&sfp->reserve); 2574 } 2575 sfp->parentdp = NULL; 2576 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); 2577 sg_page_free((char *) sfp, sizeof (Sg_fd)); 2578 } 2579 2580 /* Returns 0 in normal case, 1 when detached and sdp object removed */ 2581 static int 2582 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) 2583 { 2584 Sg_request *srp; 2585 Sg_request *tsrp; 2586 int dirty = 0; 2587 int res = 0; 2588 2589 for (srp = sfp->headrp; srp; srp = tsrp) { 2590 tsrp = srp->nextrp; 2591 if (sg_srp_done(srp, sfp)) 2592 sg_finish_rem_req(srp); 2593 else 2594 ++dirty; 2595 } 2596 if (0 == dirty) { 2597 unsigned long iflags; 2598 2599 write_lock_irqsave(&sg_dev_arr_lock, iflags); 2600 __sg_remove_sfp(sdp, sfp); 2601 if (sdp->detached && (NULL == sdp->headfp)) { 2602 int k, maxd; 2603 2604 maxd = sg_dev_max; 2605 for (k = 0; k < maxd; ++k) { 2606 if (sdp == sg_dev_arr[k]) 2607 break; 2608 } 2609 if (k < maxd) 2610 sg_dev_arr[k] = NULL; 2611 kfree((char *) sdp); 2612 res = 1; 2613 } 2614 write_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2615 } else { 2616 /* MOD_INC's to inhibit unloading sg and associated adapter driver */ 2617 /* only bump the access_count if we actually succeeded in 2618 * throwing another counter on the host module */ 2619 scsi_device_get(sdp->device); /* XXX: retval ignored? */ 2620 sfp->closed = 1; /* flag dirty state on this fd */ 2621 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", 2622 dirty)); 2623 } 2624 return res; 2625 } 2626 2627 static int 2628 sg_res_in_use(Sg_fd * sfp) 2629 { 2630 const Sg_request *srp; 2631 unsigned long iflags; 2632 2633 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2634 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2635 if (srp->res_used) 2636 break; 2637 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2638 return srp ? 1 : 0; 2639 } 2640 2641 /* If retSzp==NULL want exact size or fail */ 2642 static char * 2643 sg_page_malloc(int rqSz, int lowDma, int *retSzp) 2644 { 2645 char *resp = NULL; 2646 gfp_t page_mask; 2647 int order, a_size; 2648 int resSz = rqSz; 2649 2650 if (rqSz <= 0) 2651 return resp; 2652 2653 if (lowDma) 2654 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN; 2655 else 2656 page_mask = GFP_ATOMIC | __GFP_NOWARN; 2657 2658 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; 2659 order++, a_size <<= 1) ; 2660 resp = (char *) __get_free_pages(page_mask, order); 2661 while ((!resp) && order && retSzp) { 2662 --order; 2663 a_size >>= 1; /* divide by 2, until PAGE_SIZE */ 2664 resp = (char *) __get_free_pages(page_mask, order); /* try half */ 2665 resSz = a_size; 2666 } 2667 if (resp) { 2668 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2669 memset(resp, 0, resSz); 2670 if (retSzp) 2671 *retSzp = resSz; 2672 } 2673 return resp; 2674 } 2675 2676 static void 2677 sg_page_free(char *buff, int size) 2678 { 2679 int order, a_size; 2680 2681 if (!buff) 2682 return; 2683 for (order = 0, a_size = PAGE_SIZE; a_size < size; 2684 order++, a_size <<= 1) ; 2685 free_pages((unsigned long) buff, order); 2686 } 2687 2688 #ifndef MAINTENANCE_IN_CMD 2689 #define MAINTENANCE_IN_CMD 0xa3 2690 #endif 2691 2692 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, 2693 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, 2694 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, 2695 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD 2696 }; 2697 2698 static int 2699 sg_allow_access(unsigned char opcode, char dev_type) 2700 { 2701 int k; 2702 2703 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */ 2704 return 1; 2705 for (k = 0; k < sizeof (allow_ops); ++k) { 2706 if (opcode == allow_ops[k]) 2707 return 1; 2708 } 2709 return 0; 2710 } 2711 2712 #ifdef CONFIG_SCSI_PROC_FS 2713 static int 2714 sg_last_dev(void) 2715 { 2716 int k; 2717 unsigned long iflags; 2718 2719 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2720 for (k = sg_dev_max - 1; k >= 0; --k) 2721 if (sg_dev_arr[k] && sg_dev_arr[k]->device) 2722 break; 2723 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2724 return k + 1; /* origin 1 */ 2725 } 2726 #endif 2727 2728 static Sg_device * 2729 sg_get_dev(int dev) 2730 { 2731 Sg_device *sdp = NULL; 2732 unsigned long iflags; 2733 2734 if (sg_dev_arr && (dev >= 0)) { 2735 read_lock_irqsave(&sg_dev_arr_lock, iflags); 2736 if (dev < sg_dev_max) 2737 sdp = sg_dev_arr[dev]; 2738 read_unlock_irqrestore(&sg_dev_arr_lock, iflags); 2739 } 2740 return sdp; 2741 } 2742 2743 #ifdef CONFIG_SCSI_PROC_FS 2744 2745 static struct proc_dir_entry *sg_proc_sgp = NULL; 2746 2747 static char sg_proc_sg_dirname[] = "scsi/sg"; 2748 2749 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2750 2751 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2752 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2753 size_t count, loff_t *off); 2754 static struct file_operations adio_fops = { 2755 /* .owner, .read and .llseek added in sg_proc_init() */ 2756 .open = sg_proc_single_open_adio, 2757 .write = sg_proc_write_adio, 2758 .release = single_release, 2759 }; 2760 2761 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2762 static ssize_t sg_proc_write_dressz(struct file *filp, 2763 const char __user *buffer, size_t count, loff_t *off); 2764 static struct file_operations dressz_fops = { 2765 .open = sg_proc_single_open_dressz, 2766 .write = sg_proc_write_dressz, 2767 .release = single_release, 2768 }; 2769 2770 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2771 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2772 static struct file_operations version_fops = { 2773 .open = sg_proc_single_open_version, 2774 .release = single_release, 2775 }; 2776 2777 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2778 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2779 static struct file_operations devhdr_fops = { 2780 .open = sg_proc_single_open_devhdr, 2781 .release = single_release, 2782 }; 2783 2784 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2785 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2786 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2787 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2788 static void dev_seq_stop(struct seq_file *s, void *v); 2789 static struct file_operations dev_fops = { 2790 .open = sg_proc_open_dev, 2791 .release = seq_release, 2792 }; 2793 static struct seq_operations dev_seq_ops = { 2794 .start = dev_seq_start, 2795 .next = dev_seq_next, 2796 .stop = dev_seq_stop, 2797 .show = sg_proc_seq_show_dev, 2798 }; 2799 2800 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2801 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2802 static struct file_operations devstrs_fops = { 2803 .open = sg_proc_open_devstrs, 2804 .release = seq_release, 2805 }; 2806 static struct seq_operations devstrs_seq_ops = { 2807 .start = dev_seq_start, 2808 .next = dev_seq_next, 2809 .stop = dev_seq_stop, 2810 .show = sg_proc_seq_show_devstrs, 2811 }; 2812 2813 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2814 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2815 static struct file_operations debug_fops = { 2816 .open = sg_proc_open_debug, 2817 .release = seq_release, 2818 }; 2819 static struct seq_operations debug_seq_ops = { 2820 .start = dev_seq_start, 2821 .next = dev_seq_next, 2822 .stop = dev_seq_stop, 2823 .show = sg_proc_seq_show_debug, 2824 }; 2825 2826 2827 struct sg_proc_leaf { 2828 const char * name; 2829 struct file_operations * fops; 2830 }; 2831 2832 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2833 {"allow_dio", &adio_fops}, 2834 {"debug", &debug_fops}, 2835 {"def_reserved_size", &dressz_fops}, 2836 {"device_hdr", &devhdr_fops}, 2837 {"devices", &dev_fops}, 2838 {"device_strs", &devstrs_fops}, 2839 {"version", &version_fops} 2840 }; 2841 2842 static int 2843 sg_proc_init(void) 2844 { 2845 int k, mask; 2846 int num_leaves = 2847 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); 2848 struct proc_dir_entry *pdep; 2849 struct sg_proc_leaf * leaf; 2850 2851 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2852 if (!sg_proc_sgp) 2853 return 1; 2854 for (k = 0; k < num_leaves; ++k) { 2855 leaf = &sg_proc_leaf_arr[k]; 2856 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2857 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp); 2858 if (pdep) { 2859 leaf->fops->owner = THIS_MODULE, 2860 leaf->fops->read = seq_read, 2861 leaf->fops->llseek = seq_lseek, 2862 pdep->proc_fops = leaf->fops; 2863 } 2864 } 2865 return 0; 2866 } 2867 2868 static void 2869 sg_proc_cleanup(void) 2870 { 2871 int k; 2872 int num_leaves = 2873 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); 2874 2875 if (!sg_proc_sgp) 2876 return; 2877 for (k = 0; k < num_leaves; ++k) 2878 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2879 remove_proc_entry(sg_proc_sg_dirname, NULL); 2880 } 2881 2882 2883 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2884 { 2885 seq_printf(s, "%d\n", *((int *)s->private)); 2886 return 0; 2887 } 2888 2889 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2890 { 2891 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2892 } 2893 2894 static ssize_t 2895 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2896 size_t count, loff_t *off) 2897 { 2898 int num; 2899 char buff[11]; 2900 2901 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2902 return -EACCES; 2903 num = (count < 10) ? count : 10; 2904 if (copy_from_user(buff, buffer, num)) 2905 return -EFAULT; 2906 buff[num] = '\0'; 2907 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; 2908 return count; 2909 } 2910 2911 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2912 { 2913 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2914 } 2915 2916 static ssize_t 2917 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2918 size_t count, loff_t *off) 2919 { 2920 int num; 2921 unsigned long k = ULONG_MAX; 2922 char buff[11]; 2923 2924 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2925 return -EACCES; 2926 num = (count < 10) ? count : 10; 2927 if (copy_from_user(buff, buffer, num)) 2928 return -EFAULT; 2929 buff[num] = '\0'; 2930 k = simple_strtoul(buff, NULL, 10); 2931 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2932 sg_big_buff = k; 2933 return count; 2934 } 2935 return -ERANGE; 2936 } 2937 2938 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2939 { 2940 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2941 sg_version_date); 2942 return 0; 2943 } 2944 2945 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2946 { 2947 return single_open(file, sg_proc_seq_show_version, NULL); 2948 } 2949 2950 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2951 { 2952 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2953 "online\n"); 2954 return 0; 2955 } 2956 2957 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2958 { 2959 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2960 } 2961 2962 struct sg_proc_deviter { 2963 loff_t index; 2964 size_t max; 2965 }; 2966 2967 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2968 { 2969 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2970 2971 s->private = it; 2972 if (! it) 2973 return NULL; 2974 2975 if (NULL == sg_dev_arr) 2976 return NULL; 2977 it->index = *pos; 2978 it->max = sg_last_dev(); 2979 if (it->index >= it->max) 2980 return NULL; 2981 return it; 2982 } 2983 2984 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2985 { 2986 struct sg_proc_deviter * it = s->private; 2987 2988 *pos = ++it->index; 2989 return (it->index < it->max) ? it : NULL; 2990 } 2991 2992 static void dev_seq_stop(struct seq_file *s, void *v) 2993 { 2994 kfree(s->private); 2995 } 2996 2997 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2998 { 2999 return seq_open(file, &dev_seq_ops); 3000 } 3001 3002 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 3003 { 3004 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 3005 Sg_device *sdp; 3006 struct scsi_device *scsidp; 3007 3008 sdp = it ? sg_get_dev(it->index) : NULL; 3009 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 3010 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 3011 scsidp->host->host_no, scsidp->channel, 3012 scsidp->id, scsidp->lun, (int) scsidp->type, 3013 1, 3014 (int) scsidp->queue_depth, 3015 (int) scsidp->device_busy, 3016 (int) scsi_device_online(scsidp)); 3017 else 3018 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 3019 return 0; 3020 } 3021 3022 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 3023 { 3024 return seq_open(file, &devstrs_seq_ops); 3025 } 3026 3027 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 3028 { 3029 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 3030 Sg_device *sdp; 3031 struct scsi_device *scsidp; 3032 3033 sdp = it ? sg_get_dev(it->index) : NULL; 3034 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 3035 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 3036 scsidp->vendor, scsidp->model, scsidp->rev); 3037 else 3038 seq_printf(s, "<no active device>\n"); 3039 return 0; 3040 } 3041 3042 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 3043 { 3044 int k, m, new_interface, blen, usg; 3045 Sg_request *srp; 3046 Sg_fd *fp; 3047 const sg_io_hdr_t *hp; 3048 const char * cp; 3049 unsigned int ms; 3050 3051 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { 3052 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 3053 "(res)sgat=%d low_dma=%d\n", k + 1, 3054 jiffies_to_msecs(fp->timeout), 3055 fp->reserve.bufflen, 3056 (int) fp->reserve.k_use_sg, 3057 (int) fp->low_dma); 3058 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 3059 (int) fp->cmd_q, (int) fp->force_packid, 3060 (int) fp->keep_orphan, (int) fp->closed); 3061 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { 3062 hp = &srp->header; 3063 new_interface = (hp->interface_id == '\0') ? 0 : 1; 3064 if (srp->res_used) { 3065 if (new_interface && 3066 (SG_FLAG_MMAP_IO & hp->flags)) 3067 cp = " mmap>> "; 3068 else 3069 cp = " rb>> "; 3070 } else { 3071 if (SG_INFO_DIRECT_IO_MASK & hp->info) 3072 cp = " dio>> "; 3073 else 3074 cp = " "; 3075 } 3076 seq_printf(s, cp); 3077 blen = srp->my_cmdp ? 3078 srp->my_cmdp->sr_bufflen : srp->data.bufflen; 3079 usg = srp->my_cmdp ? 3080 srp->my_cmdp->sr_use_sg : srp->data.k_use_sg; 3081 seq_printf(s, srp->done ? 3082 ((1 == srp->done) ? "rcv:" : "fin:") 3083 : (srp->my_cmdp ? "act:" : "prior:")); 3084 seq_printf(s, " id=%d blen=%d", 3085 srp->header.pack_id, blen); 3086 if (srp->done) 3087 seq_printf(s, " dur=%d", hp->duration); 3088 else { 3089 ms = jiffies_to_msecs(jiffies); 3090 seq_printf(s, " t_o/elap=%d/%d", 3091 (new_interface ? hp->timeout : 3092 jiffies_to_msecs(fp->timeout)), 3093 (ms > hp->duration ? ms - hp->duration : 0)); 3094 } 3095 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 3096 (int) srp->data.cmd_opcode); 3097 } 3098 if (0 == m) 3099 seq_printf(s, " No requests active\n"); 3100 } 3101 } 3102 3103 static int sg_proc_open_debug(struct inode *inode, struct file *file) 3104 { 3105 return seq_open(file, &debug_seq_ops); 3106 } 3107 3108 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 3109 { 3110 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 3111 Sg_device *sdp; 3112 3113 if (it && (0 == it->index)) { 3114 seq_printf(s, "dev_max(currently)=%d max_active_device=%d " 3115 "(origin 1)\n", sg_dev_max, (int)it->max); 3116 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 3117 } 3118 sdp = it ? sg_get_dev(it->index) : NULL; 3119 if (sdp) { 3120 struct scsi_device *scsidp = sdp->device; 3121 3122 if (NULL == scsidp) { 3123 seq_printf(s, "device %d detached ??\n", 3124 (int)it->index); 3125 return 0; 3126 } 3127 3128 if (sg_get_nth_sfp(sdp, 0)) { 3129 seq_printf(s, " >>> device=%s ", 3130 sdp->disk->disk_name); 3131 if (sdp->detached) 3132 seq_printf(s, "detached pending close "); 3133 else 3134 seq_printf 3135 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 3136 scsidp->host->host_no, 3137 scsidp->channel, scsidp->id, 3138 scsidp->lun, 3139 scsidp->host->hostt->emulated); 3140 seq_printf(s, " sg_tablesize=%d excl=%d\n", 3141 sdp->sg_tablesize, sdp->exclude); 3142 } 3143 sg_proc_debug_helper(s, sdp); 3144 } 3145 return 0; 3146 } 3147 3148 #endif /* CONFIG_SCSI_PROC_FS */ 3149 3150 module_init(init_sg); 3151 module_exit(exit_sg); 3152 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 3153