drivers/scsi/megaraid/megaraid

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This source file includes following definitions.
mraid_mm_open
mraid_mm_ioctl
mraid_mm_unlocked_ioctl
mraid_mm_get_adapter
handle_drvrcmd
mimd_to_kioc
mraid_mm_attach_buf
mraid_mm_alloc_kioc
mraid_mm_dealloc_kioc
lld_ioctl
ioctl_done
lld_timedout
kioc_to_mimd
hinfo_to_cinfo
mraid_mm_register_adp
mraid_mm_adapter_app_handle
mraid_mm_setup_dma_pools
mraid_mm_unregister_adp
mraid_mm_free_adp_resources
mraid_mm_teardown_dma_pools
mraid_mm_init
mraid_mm_compat_ioctl
mraid_mm_exit
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *
   4  *                      Linux MegaRAID device driver
   5  *
   6  * Copyright (c) 2003-2004  LSI Logic Corporation.
   7  *
   8  * FILE         : megaraid_mm.c
   9  * Version      : v2.20.2.7 (Jul 16 2006)
  10  *
  11  * Common management module
  12  */
  13 #include <linux/sched.h>
  14 #include <linux/slab.h>
  15 #include <linux/mutex.h>
  16 #include "megaraid_mm.h"
  17 
  18 
  19 // Entry points for char node driver
  20 static DEFINE_MUTEX(mraid_mm_mutex);
  21 static int mraid_mm_open(struct inode *, struct file *);
  22 static long mraid_mm_unlocked_ioctl(struct file *, uint, unsigned long);
  23 
  24 
  25 // routines to convert to and from the old the format
  26 static int mimd_to_kioc(mimd_t __user *, mraid_mmadp_t *, uioc_t *);
  27 static int kioc_to_mimd(uioc_t *, mimd_t __user *);
  28 
  29 
  30 // Helper functions
  31 static int handle_drvrcmd(void __user *, uint8_t, int *);
  32 static int lld_ioctl(mraid_mmadp_t *, uioc_t *);
  33 static void ioctl_done(uioc_t *);
  34 static void lld_timedout(struct timer_list *);
  35 static void hinfo_to_cinfo(mraid_hba_info_t *, mcontroller_t *);
  36 static mraid_mmadp_t *mraid_mm_get_adapter(mimd_t __user *, int *);
  37 static uioc_t *mraid_mm_alloc_kioc(mraid_mmadp_t *);
  38 static void mraid_mm_dealloc_kioc(mraid_mmadp_t *, uioc_t *);
  39 static int mraid_mm_attach_buf(mraid_mmadp_t *, uioc_t *, int);
  40 static int mraid_mm_setup_dma_pools(mraid_mmadp_t *);
  41 static void mraid_mm_free_adp_resources(mraid_mmadp_t *);
  42 static void mraid_mm_teardown_dma_pools(mraid_mmadp_t *);
  43 
  44 #ifdef CONFIG_COMPAT
  45 static long mraid_mm_compat_ioctl(struct file *, unsigned int, unsigned long);
  46 #endif
  47 
  48 MODULE_AUTHOR("LSI Logic Corporation");
  49 MODULE_DESCRIPTION("LSI Logic Management Module");
  50 MODULE_LICENSE("GPL");
  51 MODULE_VERSION(LSI_COMMON_MOD_VERSION);
  52 
  53 static int dbglevel = CL_ANN;
  54 module_param_named(dlevel, dbglevel, int, 0);
  55 MODULE_PARM_DESC(dlevel, "Debug level (default=0)");
  56 
  57 EXPORT_SYMBOL(mraid_mm_register_adp);
  58 EXPORT_SYMBOL(mraid_mm_unregister_adp);
  59 EXPORT_SYMBOL(mraid_mm_adapter_app_handle);
  60 
  61 static uint32_t drvr_ver        = 0x02200207;
  62 
  63 static int adapters_count_g;
  64 static struct list_head adapters_list_g;
  65 
  66 static wait_queue_head_t wait_q;
  67 
  68 static const struct file_operations lsi_fops = {
  69         .open   = mraid_mm_open,
  70         .unlocked_ioctl = mraid_mm_unlocked_ioctl,
  71 #ifdef CONFIG_COMPAT
  72         .compat_ioctl = mraid_mm_compat_ioctl,
  73 #endif
  74         .owner  = THIS_MODULE,
  75         .llseek = noop_llseek,
  76 };
  77 
  78 static struct miscdevice megaraid_mm_dev = {
  79         .minor  = MISC_DYNAMIC_MINOR,
  80         .name   = "megadev0",
  81         .fops   = &lsi_fops,
  82 };
  83 
  84 /**
  85  * mraid_mm_open - open routine for char node interface
  86  * @inode       : unused
  87  * @filep       : unused
  88  *
  89  * Allow ioctl operations by apps only if they have superuser privilege.
  90  */
  91 static int
  92 mraid_mm_open(struct inode *inode, struct file *filep)
  93 {
  94         /*
  95          * Only allow superuser to access private ioctl interface
  96          */
  97         if (!capable(CAP_SYS_ADMIN)) return (-EACCES);
  98 
  99         return 0;
 100 }
 101 
 102 /**
 103  * mraid_mm_ioctl - module entry-point for ioctls
 104  * @inode       : inode (ignored)
 105  * @filep       : file operations pointer (ignored)
 106  * @cmd         : ioctl command
 107  * @arg         : user ioctl packet
 108  */
 109 static int
 110 mraid_mm_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 111 {
 112         uioc_t          *kioc;
 113         char            signature[EXT_IOCTL_SIGN_SZ]    = {0};
 114         int             rval;
 115         mraid_mmadp_t   *adp;
 116         uint8_t         old_ioctl;
 117         int             drvrcmd_rval;
 118         void __user *argp = (void __user *)arg;
 119 
 120         /*
 121          * Make sure only USCSICMD are issued through this interface.
 122          * MIMD application would still fire different command.
 123          */
 124 
 125         if ((_IOC_TYPE(cmd) != MEGAIOC_MAGIC) && (cmd != USCSICMD)) {
 126                 return (-EINVAL);
 127         }
 128 
 129         /*
 130          * Look for signature to see if this is the new or old ioctl format.
 131          */
 132         if (copy_from_user(signature, argp, EXT_IOCTL_SIGN_SZ)) {
 133                 con_log(CL_ANN, (KERN_WARNING
 134                         "megaraid cmm: copy from usr addr failed\n"));
 135                 return (-EFAULT);
 136         }
 137 
 138         if (memcmp(signature, EXT_IOCTL_SIGN, EXT_IOCTL_SIGN_SZ) == 0)
 139                 old_ioctl = 0;
 140         else
 141                 old_ioctl = 1;
 142 
 143         /*
 144          * At present, we don't support the new ioctl packet
 145          */
 146         if (!old_ioctl )
 147                 return (-EINVAL);
 148 
 149         /*
 150          * If it is a driver ioctl (as opposed to fw ioctls), then we can
 151          * handle the command locally. rval > 0 means it is not a drvr cmd
 152          */
 153         rval = handle_drvrcmd(argp, old_ioctl, &drvrcmd_rval);
 154 
 155         if (rval < 0)
 156                 return rval;
 157         else if (rval == 0)
 158                 return drvrcmd_rval;
 159 
 160         rval = 0;
 161         if ((adp = mraid_mm_get_adapter(argp, &rval)) == NULL) {
 162                 return rval;
 163         }
 164 
 165         /*
 166          * Check if adapter can accept ioctl. We may have marked it offline
 167          * if any previous kioc had timedout on this controller.
 168          */
 169         if (!adp->quiescent) {
 170                 con_log(CL_ANN, (KERN_WARNING
 171                         "megaraid cmm: controller cannot accept cmds due to "
 172                         "earlier errors\n" ));
 173                 return -EFAULT;
 174         }
 175 
 176         /*
 177          * The following call will block till a kioc is available
 178          * or return NULL if the list head is empty for the pointer
 179          * of type mraid_mmapt passed to mraid_mm_alloc_kioc
 180          */
 181         kioc = mraid_mm_alloc_kioc(adp);
 182         if (!kioc)
 183                 return -ENXIO;
 184 
 185         /*
 186          * User sent the old mimd_t ioctl packet. Convert it to uioc_t.
 187          */
 188         if ((rval = mimd_to_kioc(argp, adp, kioc))) {
 189                 mraid_mm_dealloc_kioc(adp, kioc);
 190                 return rval;
 191         }
 192 
 193         kioc->done = ioctl_done;
 194 
 195         /*
 196          * Issue the IOCTL to the low level driver. After the IOCTL completes
 197          * release the kioc if and only if it was _not_ timedout. If it was
 198          * timedout, that means that resources are still with low level driver.
 199          */
 200         if ((rval = lld_ioctl(adp, kioc))) {
 201 
 202                 if (!kioc->timedout)
 203                         mraid_mm_dealloc_kioc(adp, kioc);
 204 
 205                 return rval;
 206         }
 207 
 208         /*
 209          * Convert the kioc back to user space
 210          */
 211         rval = kioc_to_mimd(kioc, argp);
 212 
 213         /*
 214          * Return the kioc to free pool
 215          */
 216         mraid_mm_dealloc_kioc(adp, kioc);
 217 
 218         return rval;
 219 }
 220 
 221 static long
 222 mraid_mm_unlocked_ioctl(struct file *filep, unsigned int cmd,
 223                         unsigned long arg)
 224 {
 225         int err;
 226 
 227         /* inconsistent: mraid_mm_compat_ioctl doesn't take the BKL */
 228         mutex_lock(&mraid_mm_mutex);
 229         err = mraid_mm_ioctl(filep, cmd, arg);
 230         mutex_unlock(&mraid_mm_mutex);
 231 
 232         return err;
 233 }
 234 
 235 /**
 236  * mraid_mm_get_adapter - Returns corresponding adapters for the mimd packet
 237  * @umimd       : User space mimd_t ioctl packet
 238  * @rval        : returned success/error status
 239  *
 240  * The function return value is a pointer to the located @adapter.
 241  */
 242 static mraid_mmadp_t *
 243 mraid_mm_get_adapter(mimd_t __user *umimd, int *rval)
 244 {
 245         mraid_mmadp_t   *adapter;
 246         mimd_t          mimd;
 247         uint32_t        adapno;
 248         int             iterator;
 249 
 250 
 251         if (copy_from_user(&mimd, umimd, sizeof(mimd_t))) {
 252                 *rval = -EFAULT;
 253                 return NULL;
 254         }
 255 
 256         adapno = GETADAP(mimd.ui.fcs.adapno);
 257 
 258         if (adapno >= adapters_count_g) {
 259                 *rval = -ENODEV;
 260                 return NULL;
 261         }
 262 
 263         adapter = NULL;
 264         iterator = 0;
 265 
 266         list_for_each_entry(adapter, &adapters_list_g, list) {
 267                 if (iterator++ == adapno) break;
 268         }
 269 
 270         if (!adapter) {
 271                 *rval = -ENODEV;
 272                 return NULL;
 273         }
 274 
 275         return adapter;
 276 }
 277 
 278 /**
 279  * handle_drvrcmd - Checks if the opcode is a driver cmd and if it is, handles it.
 280  * @arg         : packet sent by the user app
 281  * @old_ioctl   : mimd if 1; uioc otherwise
 282  * @rval        : pointer for command's returned value (not function status)
 283  */
 284 static int
 285 handle_drvrcmd(void __user *arg, uint8_t old_ioctl, int *rval)
 286 {
 287         mimd_t          __user *umimd;
 288         mimd_t          kmimd;
 289         uint8_t         opcode;
 290         uint8_t         subopcode;
 291 
 292         if (old_ioctl)
 293                 goto old_packet;
 294         else
 295                 goto new_packet;
 296 
 297 new_packet:
 298         return (-ENOTSUPP);
 299 
 300 old_packet:
 301         *rval = 0;
 302         umimd = arg;
 303 
 304         if (copy_from_user(&kmimd, umimd, sizeof(mimd_t)))
 305                 return (-EFAULT);
 306 
 307         opcode          = kmimd.ui.fcs.opcode;
 308         subopcode       = kmimd.ui.fcs.subopcode;
 309 
 310         /*
 311          * If the opcode is 0x82 and the subopcode is either GET_DRVRVER or
 312          * GET_NUMADP, then we can handle. Otherwise we should return 1 to
 313          * indicate that we cannot handle this.
 314          */
 315         if (opcode != 0x82)
 316                 return 1;
 317 
 318         switch (subopcode) {
 319 
 320         case MEGAIOC_QDRVRVER:
 321 
 322                 if (copy_to_user(kmimd.data, &drvr_ver, sizeof(uint32_t)))
 323                         return (-EFAULT);
 324 
 325                 return 0;
 326 
 327         case MEGAIOC_QNADAP:
 328 
 329                 *rval = adapters_count_g;
 330 
 331                 if (copy_to_user(kmimd.data, &adapters_count_g,
 332                                 sizeof(uint32_t)))
 333                         return (-EFAULT);
 334 
 335                 return 0;
 336 
 337         default:
 338                 /* cannot handle */
 339                 return 1;
 340         }
 341 
 342         return 0;
 343 }
 344 
 345 
 346 /**
 347  * mimd_to_kioc - Converter from old to new ioctl format
 348  * @umimd       : user space old MIMD IOCTL
 349  * @adp         : adapter softstate
 350  * @kioc        : kernel space new format IOCTL
 351  *
 352  * Routine to convert MIMD interface IOCTL to new interface IOCTL packet. The
 353  * new packet is in kernel space so that driver can perform operations on it
 354  * freely.
 355  */
 356 
 357 static int
 358 mimd_to_kioc(mimd_t __user *umimd, mraid_mmadp_t *adp, uioc_t *kioc)
 359 {
 360         mbox64_t                *mbox64;
 361         mbox_t                  *mbox;
 362         mraid_passthru_t        *pthru32;
 363         uint32_t                adapno;
 364         uint8_t                 opcode;
 365         uint8_t                 subopcode;
 366         mimd_t                  mimd;
 367 
 368         if (copy_from_user(&mimd, umimd, sizeof(mimd_t)))
 369                 return (-EFAULT);
 370 
 371         /*
 372          * Applications are not allowed to send extd pthru
 373          */
 374         if ((mimd.mbox[0] == MBOXCMD_PASSTHRU64) ||
 375                         (mimd.mbox[0] == MBOXCMD_EXTPTHRU))
 376                 return (-EINVAL);
 377 
 378         opcode          = mimd.ui.fcs.opcode;
 379         subopcode       = mimd.ui.fcs.subopcode;
 380         adapno          = GETADAP(mimd.ui.fcs.adapno);
 381 
 382         if (adapno >= adapters_count_g)
 383                 return (-ENODEV);
 384 
 385         kioc->adapno    = adapno;
 386         kioc->mb_type   = MBOX_LEGACY;
 387         kioc->app_type  = APPTYPE_MIMD;
 388 
 389         switch (opcode) {
 390 
 391         case 0x82:
 392 
 393                 if (subopcode == MEGAIOC_QADAPINFO) {
 394 
 395                         kioc->opcode    = GET_ADAP_INFO;
 396                         kioc->data_dir  = UIOC_RD;
 397                         kioc->xferlen   = sizeof(mraid_hba_info_t);
 398 
 399                         if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
 400                                 return (-ENOMEM);
 401                 }
 402                 else {
 403                         con_log(CL_ANN, (KERN_WARNING
 404                                         "megaraid cmm: Invalid subop\n"));
 405                         return (-EINVAL);
 406                 }
 407 
 408                 break;
 409 
 410         case 0x81:
 411 
 412                 kioc->opcode            = MBOX_CMD;
 413                 kioc->xferlen           = mimd.ui.fcs.length;
 414                 kioc->user_data_len     = kioc->xferlen;
 415                 kioc->user_data         = mimd.ui.fcs.buffer;
 416 
 417                 if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
 418                         return (-ENOMEM);
 419 
 420                 if (mimd.outlen) kioc->data_dir  = UIOC_RD;
 421                 if (mimd.inlen) kioc->data_dir |= UIOC_WR;
 422 
 423                 break;
 424 
 425         case 0x80:
 426 
 427                 kioc->opcode            = MBOX_CMD;
 428                 kioc->xferlen           = (mimd.outlen > mimd.inlen) ?
 429                                                 mimd.outlen : mimd.inlen;
 430                 kioc->user_data_len     = kioc->xferlen;
 431                 kioc->user_data         = mimd.data;
 432 
 433                 if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
 434                         return (-ENOMEM);
 435 
 436                 if (mimd.outlen) kioc->data_dir  = UIOC_RD;
 437                 if (mimd.inlen) kioc->data_dir |= UIOC_WR;
 438 
 439                 break;
 440 
 441         default:
 442                 return (-EINVAL);
 443         }
 444 
 445         /*
 446          * If driver command, nothing else to do
 447          */
 448         if (opcode == 0x82)
 449                 return 0;
 450 
 451         /*
 452          * This is a mailbox cmd; copy the mailbox from mimd
 453          */
 454         mbox64  = (mbox64_t *)((unsigned long)kioc->cmdbuf);
 455         mbox    = &mbox64->mbox32;
 456         memcpy(mbox, mimd.mbox, 14);
 457 
 458         if (mbox->cmd != MBOXCMD_PASSTHRU) {    // regular DCMD
 459 
 460                 mbox->xferaddr  = (uint32_t)kioc->buf_paddr;
 461 
 462                 if (kioc->data_dir & UIOC_WR) {
 463                         if (copy_from_user(kioc->buf_vaddr, kioc->user_data,
 464                                                         kioc->xferlen)) {
 465                                 return (-EFAULT);
 466                         }
 467                 }
 468 
 469                 return 0;
 470         }
 471 
 472         /*
 473          * This is a regular 32-bit pthru cmd; mbox points to pthru struct.
 474          * Just like in above case, the beginning for memblk is treated as
 475          * a mailbox. The passthru will begin at next 1K boundary. And the
 476          * data will start 1K after that.
 477          */
 478         pthru32                 = kioc->pthru32;
 479         kioc->user_pthru        = &umimd->pthru;
 480         mbox->xferaddr          = (uint32_t)kioc->pthru32_h;
 481 
 482         if (copy_from_user(pthru32, kioc->user_pthru,
 483                         sizeof(mraid_passthru_t))) {
 484                 return (-EFAULT);
 485         }
 486 
 487         pthru32->dataxferaddr   = kioc->buf_paddr;
 488         if (kioc->data_dir & UIOC_WR) {
 489                 if (pthru32->dataxferlen > kioc->xferlen)
 490                         return -EINVAL;
 491                 if (copy_from_user(kioc->buf_vaddr, kioc->user_data,
 492                                                 pthru32->dataxferlen)) {
 493                         return (-EFAULT);
 494                 }
 495         }
 496 
 497         return 0;
 498 }
 499 
 500 /**
 501  * mraid_mm_attch_buf - Attach a free dma buffer for required size
 502  * @adp         : Adapter softstate
 503  * @kioc        : kioc that the buffer needs to be attached to
 504  * @xferlen     : required length for buffer
 505  *
 506  * First we search for a pool with smallest buffer that is >= @xferlen. If
 507  * that pool has no free buffer, we will try for the next bigger size. If none
 508  * is available, we will try to allocate the smallest buffer that is >=
 509  * @xferlen and attach it the pool.
 510  */
 511 static int
 512 mraid_mm_attach_buf(mraid_mmadp_t *adp, uioc_t *kioc, int xferlen)
 513 {
 514         mm_dmapool_t    *pool;
 515         int             right_pool = -1;
 516         unsigned long   flags;
 517         int             i;
 518 
 519         kioc->pool_index        = -1;
 520         kioc->buf_vaddr         = NULL;
 521         kioc->buf_paddr         = 0;
 522         kioc->free_buf          = 0;
 523 
 524         /*
 525          * We need xferlen amount of memory. See if we can get it from our
 526          * dma pools. If we don't get exact size, we will try bigger buffer
 527          */
 528 
 529         for (i = 0; i < MAX_DMA_POOLS; i++) {
 530 
 531                 pool = &adp->dma_pool_list[i];
 532 
 533                 if (xferlen > pool->buf_size)
 534                         continue;
 535 
 536                 if (right_pool == -1)
 537                         right_pool = i;
 538 
 539                 spin_lock_irqsave(&pool->lock, flags);
 540 
 541                 if (!pool->in_use) {
 542 
 543                         pool->in_use            = 1;
 544                         kioc->pool_index        = i;
 545                         kioc->buf_vaddr         = pool->vaddr;
 546                         kioc->buf_paddr         = pool->paddr;
 547 
 548                         spin_unlock_irqrestore(&pool->lock, flags);
 549                         return 0;
 550                 }
 551                 else {
 552                         spin_unlock_irqrestore(&pool->lock, flags);
 553                         continue;
 554                 }
 555         }
 556 
 557         /*
 558          * If xferlen doesn't match any of our pools, return error
 559          */
 560         if (right_pool == -1)
 561                 return -EINVAL;
 562 
 563         /*
 564          * We did not get any buffer from the preallocated pool. Let us try
 565          * to allocate one new buffer. NOTE: This is a blocking call.
 566          */
 567         pool = &adp->dma_pool_list[right_pool];
 568 
 569         spin_lock_irqsave(&pool->lock, flags);
 570 
 571         kioc->pool_index        = right_pool;
 572         kioc->free_buf          = 1;
 573         kioc->buf_vaddr         = dma_pool_alloc(pool->handle, GFP_ATOMIC,
 574                                                         &kioc->buf_paddr);
 575         spin_unlock_irqrestore(&pool->lock, flags);
 576 
 577         if (!kioc->buf_vaddr)
 578                 return -ENOMEM;
 579 
 580         return 0;
 581 }
 582 
 583 /**
 584  * mraid_mm_alloc_kioc - Returns a uioc_t from free list
 585  * @adp : Adapter softstate for this module
 586  *
 587  * The kioc_semaphore is initialized with number of kioc nodes in the
 588  * free kioc pool. If the kioc pool is empty, this function blocks till
 589  * a kioc becomes free.
 590  */
 591 static uioc_t *
 592 mraid_mm_alloc_kioc(mraid_mmadp_t *adp)
 593 {
 594         uioc_t                  *kioc;
 595         struct list_head*       head;
 596         unsigned long           flags;
 597 
 598         down(&adp->kioc_semaphore);
 599 
 600         spin_lock_irqsave(&adp->kioc_pool_lock, flags);
 601 
 602         head = &adp->kioc_pool;
 603 
 604         if (list_empty(head)) {
 605                 up(&adp->kioc_semaphore);
 606                 spin_unlock_irqrestore(&adp->kioc_pool_lock, flags);
 607 
 608                 con_log(CL_ANN, ("megaraid cmm: kioc list empty!\n"));
 609                 return NULL;
 610         }
 611 
 612         kioc = list_entry(head->next, uioc_t, list);
 613         list_del_init(&kioc->list);
 614 
 615         spin_unlock_irqrestore(&adp->kioc_pool_lock, flags);
 616 
 617         memset((caddr_t)(unsigned long)kioc->cmdbuf, 0, sizeof(mbox64_t));
 618         memset((caddr_t) kioc->pthru32, 0, sizeof(mraid_passthru_t));
 619 
 620         kioc->buf_vaddr         = NULL;
 621         kioc->buf_paddr         = 0;
 622         kioc->pool_index        =-1;
 623         kioc->free_buf          = 0;
 624         kioc->user_data         = NULL;
 625         kioc->user_data_len     = 0;
 626         kioc->user_pthru        = NULL;
 627         kioc->timedout          = 0;
 628 
 629         return kioc;
 630 }
 631 
 632 /**
 633  * mraid_mm_dealloc_kioc - Return kioc to free pool
 634  * @adp         : Adapter softstate
 635  * @kioc        : uioc_t node to be returned to free pool
 636  */
 637 static void
 638 mraid_mm_dealloc_kioc(mraid_mmadp_t *adp, uioc_t *kioc)
 639 {
 640         mm_dmapool_t    *pool;
 641         unsigned long   flags;
 642 
 643         if (kioc->pool_index != -1) {
 644                 pool = &adp->dma_pool_list[kioc->pool_index];
 645 
 646                 /* This routine may be called in non-isr context also */
 647                 spin_lock_irqsave(&pool->lock, flags);
 648 
 649                 /*
 650                  * While attaching the dma buffer, if we didn't get the 
 651                  * required buffer from the pool, we would have allocated 
 652                  * it at the run time and set the free_buf flag. We must 
 653                  * free that buffer. Otherwise, just mark that the buffer is 
 654                  * not in use
 655                  */
 656                 if (kioc->free_buf == 1)
 657                         dma_pool_free(pool->handle, kioc->buf_vaddr, 
 658                                                         kioc->buf_paddr);
 659                 else
 660                         pool->in_use = 0;
 661 
 662                 spin_unlock_irqrestore(&pool->lock, flags);
 663         }
 664 
 665         /* Return the kioc to the free pool */
 666         spin_lock_irqsave(&adp->kioc_pool_lock, flags);
 667         list_add(&kioc->list, &adp->kioc_pool);
 668         spin_unlock_irqrestore(&adp->kioc_pool_lock, flags);
 669 
 670         /* increment the free kioc count */
 671         up(&adp->kioc_semaphore);
 672 
 673         return;
 674 }
 675 
 676 /**
 677  * lld_ioctl - Routine to issue ioctl to low level drvr
 678  * @adp         : The adapter handle
 679  * @kioc        : The ioctl packet with kernel addresses
 680  */
 681 static int
 682 lld_ioctl(mraid_mmadp_t *adp, uioc_t *kioc)
 683 {
 684         int                     rval;
 685         struct uioc_timeout     timeout = { };
 686 
 687         kioc->status    = -ENODATA;
 688         rval            = adp->issue_uioc(adp->drvr_data, kioc, IOCTL_ISSUE);
 689 
 690         if (rval) return rval;
 691 
 692         /*
 693          * Start the timer
 694          */
 695         if (adp->timeout > 0) {
 696                 timeout.uioc = kioc;
 697                 timer_setup_on_stack(&timeout.timer, lld_timedout, 0);
 698 
 699                 timeout.timer.expires   = jiffies + adp->timeout * HZ;
 700 
 701                 add_timer(&timeout.timer);
 702         }
 703 
 704         /*
 705          * Wait till the low level driver completes the ioctl. After this
 706          * call, the ioctl either completed successfully or timedout.
 707          */
 708         wait_event(wait_q, (kioc->status != -ENODATA));
 709         if (timeout.timer.function) {
 710                 del_timer_sync(&timeout.timer);
 711                 destroy_timer_on_stack(&timeout.timer);
 712         }
 713 
 714         /*
 715          * If the command had timedout, we mark the controller offline
 716          * before returning
 717          */
 718         if (kioc->timedout) {
 719                 adp->quiescent = 0;
 720         }
 721 
 722         return kioc->status;
 723 }
 724 
 725 
 726 /**
 727  * ioctl_done - callback from the low level driver
 728  * @kioc        : completed ioctl packet
 729  */
 730 static void
 731 ioctl_done(uioc_t *kioc)
 732 {
 733         uint32_t        adapno;
 734         int             iterator;
 735         mraid_mmadp_t*  adapter;
 736 
 737         /*
 738          * When the kioc returns from driver, make sure it still doesn't
 739          * have ENODATA in status. Otherwise, driver will hang on wait_event
 740          * forever
 741          */
 742         if (kioc->status == -ENODATA) {
 743                 con_log(CL_ANN, (KERN_WARNING
 744                         "megaraid cmm: lld didn't change status!\n"));
 745 
 746                 kioc->status = -EINVAL;
 747         }
 748 
 749         /*
 750          * Check if this kioc was timedout before. If so, nobody is waiting
 751          * on this kioc. We don't have to wake up anybody. Instead, we just
 752          * have to free the kioc
 753          */
 754         if (kioc->timedout) {
 755                 iterator        = 0;
 756                 adapter         = NULL;
 757                 adapno          = kioc->adapno;
 758 
 759                 con_log(CL_ANN, ( KERN_WARNING "megaraid cmm: completed "
 760                                         "ioctl that was timedout before\n"));
 761 
 762                 list_for_each_entry(adapter, &adapters_list_g, list) {
 763                         if (iterator++ == adapno) break;
 764                 }
 765 
 766                 kioc->timedout = 0;
 767 
 768                 if (adapter) {
 769                         mraid_mm_dealloc_kioc( adapter, kioc );
 770                 }
 771         }
 772         else {
 773                 wake_up(&wait_q);
 774         }
 775 }
 776 
 777 
 778 /**
 779  * lld_timedout - callback from the expired timer
 780  * @t           : timer that timed out
 781  */
 782 static void
 783 lld_timedout(struct timer_list *t)
 784 {
 785         struct uioc_timeout *timeout = from_timer(timeout, t, timer);
 786         uioc_t *kioc    = timeout->uioc;
 787 
 788         kioc->status    = -ETIME;
 789         kioc->timedout  = 1;
 790 
 791         con_log(CL_ANN, (KERN_WARNING "megaraid cmm: ioctl timed out\n"));
 792 
 793         wake_up(&wait_q);
 794 }
 795 
 796 
 797 /**
 798  * kioc_to_mimd - Converter from new back to old format
 799  * @kioc        : Kernel space IOCTL packet (successfully issued)
 800  * @mimd        : User space MIMD packet
 801  */
 802 static int
 803 kioc_to_mimd(uioc_t *kioc, mimd_t __user *mimd)
 804 {
 805         mimd_t                  kmimd;
 806         uint8_t                 opcode;
 807         uint8_t                 subopcode;
 808 
 809         mbox64_t                *mbox64;
 810         mraid_passthru_t        __user *upthru32;
 811         mraid_passthru_t        *kpthru32;
 812         mcontroller_t           cinfo;
 813         mraid_hba_info_t        *hinfo;
 814 
 815 
 816         if (copy_from_user(&kmimd, mimd, sizeof(mimd_t)))
 817                 return (-EFAULT);
 818 
 819         opcode          = kmimd.ui.fcs.opcode;
 820         subopcode       = kmimd.ui.fcs.subopcode;
 821 
 822         if (opcode == 0x82) {
 823                 switch (subopcode) {
 824 
 825                 case MEGAIOC_QADAPINFO:
 826 
 827                         hinfo = (mraid_hba_info_t *)(unsigned long)
 828                                         kioc->buf_vaddr;
 829 
 830                         hinfo_to_cinfo(hinfo, &cinfo);
 831 
 832                         if (copy_to_user(kmimd.data, &cinfo, sizeof(cinfo)))
 833                                 return (-EFAULT);
 834 
 835                         return 0;
 836 
 837                 default:
 838                         return (-EINVAL);
 839                 }
 840 
 841                 return 0;
 842         }
 843 
 844         mbox64 = (mbox64_t *)(unsigned long)kioc->cmdbuf;
 845 
 846         if (kioc->user_pthru) {
 847 
 848                 upthru32 = kioc->user_pthru;
 849                 kpthru32 = kioc->pthru32;
 850 
 851                 if (copy_to_user(&upthru32->scsistatus,
 852                                         &kpthru32->scsistatus,
 853                                         sizeof(uint8_t))) {
 854                         return (-EFAULT);
 855                 }
 856         }
 857 
 858         if (kioc->user_data) {
 859                 if (copy_to_user(kioc->user_data, kioc->buf_vaddr,
 860                                         kioc->user_data_len)) {
 861                         return (-EFAULT);
 862                 }
 863         }
 864 
 865         if (copy_to_user(&mimd->mbox[17],
 866                         &mbox64->mbox32.status, sizeof(uint8_t))) {
 867                 return (-EFAULT);
 868         }
 869 
 870         return 0;
 871 }
 872 
 873 
 874 /**
 875  * hinfo_to_cinfo - Convert new format hba info into old format
 876  * @hinfo       : New format, more comprehensive adapter info
 877  * @cinfo       : Old format adapter info to support mimd_t apps
 878  */
 879 static void
 880 hinfo_to_cinfo(mraid_hba_info_t *hinfo, mcontroller_t *cinfo)
 881 {
 882         if (!hinfo || !cinfo)
 883                 return;
 884 
 885         cinfo->base             = hinfo->baseport;
 886         cinfo->irq              = hinfo->irq;
 887         cinfo->numldrv          = hinfo->num_ldrv;
 888         cinfo->pcibus           = hinfo->pci_bus;
 889         cinfo->pcidev           = hinfo->pci_slot;
 890         cinfo->pcifun           = PCI_FUNC(hinfo->pci_dev_fn);
 891         cinfo->pciid            = hinfo->pci_device_id;
 892         cinfo->pcivendor        = hinfo->pci_vendor_id;
 893         cinfo->pcislot          = hinfo->pci_slot;
 894         cinfo->uid              = hinfo->unique_id;
 895 }
 896 
 897 
 898 /**
 899  * mraid_mm_register_adp - Registration routine for low level drivers
 900  * @lld_adp     : Adapter object
 901  */
 902 int
 903 mraid_mm_register_adp(mraid_mmadp_t *lld_adp)
 904 {
 905         mraid_mmadp_t   *adapter;
 906         mbox64_t        *mbox_list;
 907         uioc_t          *kioc;
 908         uint32_t        rval;
 909         int             i;
 910 
 911 
 912         if (lld_adp->drvr_type != DRVRTYPE_MBOX)
 913                 return (-EINVAL);
 914 
 915         adapter = kzalloc(sizeof(mraid_mmadp_t), GFP_KERNEL);
 916 
 917         if (!adapter)
 918                 return -ENOMEM;
 919 
 920 
 921         adapter->unique_id      = lld_adp->unique_id;
 922         adapter->drvr_type      = lld_adp->drvr_type;
 923         adapter->drvr_data      = lld_adp->drvr_data;
 924         adapter->pdev           = lld_adp->pdev;
 925         adapter->issue_uioc     = lld_adp->issue_uioc;
 926         adapter->timeout        = lld_adp->timeout;
 927         adapter->max_kioc       = lld_adp->max_kioc;
 928         adapter->quiescent      = 1;
 929 
 930         /*
 931          * Allocate single blocks of memory for all required kiocs,
 932          * mailboxes and passthru structures.
 933          */
 934         adapter->kioc_list      = kmalloc_array(lld_adp->max_kioc,
 935                                                   sizeof(uioc_t),
 936                                                   GFP_KERNEL);
 937         adapter->mbox_list      = kmalloc_array(lld_adp->max_kioc,
 938                                                   sizeof(mbox64_t),
 939                                                   GFP_KERNEL);
 940         adapter->pthru_dma_pool = dma_pool_create("megaraid mm pthru pool",
 941                                                 &adapter->pdev->dev,
 942                                                 sizeof(mraid_passthru_t),
 943                                                 16, 0);
 944 
 945         if (!adapter->kioc_list || !adapter->mbox_list ||
 946                         !adapter->pthru_dma_pool) {
 947 
 948                 con_log(CL_ANN, (KERN_WARNING
 949                         "megaraid cmm: out of memory, %s %d\n", __func__,
 950                         __LINE__));
 951 
 952                 rval = (-ENOMEM);
 953 
 954                 goto memalloc_error;
 955         }
 956 
 957         /*
 958          * Slice kioc_list and make a kioc_pool with the individiual kiocs
 959          */
 960         INIT_LIST_HEAD(&adapter->kioc_pool);
 961         spin_lock_init(&adapter->kioc_pool_lock);
 962         sema_init(&adapter->kioc_semaphore, lld_adp->max_kioc);
 963 
 964         mbox_list       = (mbox64_t *)adapter->mbox_list;
 965 
 966         for (i = 0; i < lld_adp->max_kioc; i++) {
 967 
 968                 kioc            = adapter->kioc_list + i;
 969                 kioc->cmdbuf    = (uint64_t)(unsigned long)(mbox_list + i);
 970                 kioc->pthru32   = dma_pool_alloc(adapter->pthru_dma_pool,
 971                                                 GFP_KERNEL, &kioc->pthru32_h);
 972 
 973                 if (!kioc->pthru32) {
 974 
 975                         con_log(CL_ANN, (KERN_WARNING
 976                                 "megaraid cmm: out of memory, %s %d\n",
 977                                         __func__, __LINE__));
 978 
 979                         rval = (-ENOMEM);
 980 
 981                         goto pthru_dma_pool_error;
 982                 }
 983 
 984                 list_add_tail(&kioc->list, &adapter->kioc_pool);
 985         }
 986 
 987         // Setup the dma pools for data buffers
 988         if ((rval = mraid_mm_setup_dma_pools(adapter)) != 0) {
 989                 goto dma_pool_error;
 990         }
 991 
 992         list_add_tail(&adapter->list, &adapters_list_g);
 993 
 994         adapters_count_g++;
 995 
 996         return 0;
 997 
 998 dma_pool_error:
 999         /* Do nothing */
1000 
1001 pthru_dma_pool_error:
1002 
1003         for (i = 0; i < lld_adp->max_kioc; i++) {
1004                 kioc = adapter->kioc_list + i;
1005                 if (kioc->pthru32) {
1006                         dma_pool_free(adapter->pthru_dma_pool, kioc->pthru32,
1007                                 kioc->pthru32_h);
1008                 }
1009         }
1010 
1011 memalloc_error:
1012 
1013         kfree(adapter->kioc_list);
1014         kfree(adapter->mbox_list);
1015 
1016         dma_pool_destroy(adapter->pthru_dma_pool);
1017 
1018         kfree(adapter);
1019 
1020         return rval;
1021 }
1022 
1023 
1024 /**
1025  * mraid_mm_adapter_app_handle - return the application handle for this adapter
1026  * @unique_id   : adapter unique identifier
1027  *
1028  * For the given driver data, locate the adapter in our global list and
1029  * return the corresponding handle, which is also used by applications to
1030  * uniquely identify an adapter.
1031  *
1032  * Return adapter handle if found in the list.
1033  * Return 0 if adapter could not be located, should never happen though.
1034  */
1035 uint32_t
1036 mraid_mm_adapter_app_handle(uint32_t unique_id)
1037 {
1038         mraid_mmadp_t   *adapter;
1039         mraid_mmadp_t   *tmp;
1040         int             index = 0;
1041 
1042         list_for_each_entry_safe(adapter, tmp, &adapters_list_g, list) {
1043 
1044                 if (adapter->unique_id == unique_id) {
1045 
1046                         return MKADAP(index);
1047                 }
1048 
1049                 index++;
1050         }
1051 
1052         return 0;
1053 }
1054 
1055 
1056 /**
1057  * mraid_mm_setup_dma_pools - Set up dma buffer pools per adapter
1058  * @adp : Adapter softstate
1059  *
1060  * We maintain a pool of dma buffers per each adapter. Each pool has one
1061  * buffer. E.g, we may have 5 dma pools - one each for 4k, 8k ... 64k buffers.
1062  * We have just one 4k buffer in 4k pool, one 8k buffer in 8k pool etc. We
1063  * dont' want to waste too much memory by allocating more buffers per each
1064  * pool.
1065  */
1066 static int
1067 mraid_mm_setup_dma_pools(mraid_mmadp_t *adp)
1068 {
1069         mm_dmapool_t    *pool;
1070         int             bufsize;
1071         int             i;
1072 
1073         /*
1074          * Create MAX_DMA_POOLS number of pools
1075          */
1076         bufsize = MRAID_MM_INIT_BUFF_SIZE;
1077 
1078         for (i = 0; i < MAX_DMA_POOLS; i++){
1079 
1080                 pool = &adp->dma_pool_list[i];
1081 
1082                 pool->buf_size = bufsize;
1083                 spin_lock_init(&pool->lock);
1084 
1085                 pool->handle = dma_pool_create("megaraid mm data buffer",
1086                                                 &adp->pdev->dev, bufsize,
1087                                                 16, 0);
1088 
1089                 if (!pool->handle) {
1090                         goto dma_pool_setup_error;
1091                 }
1092 
1093                 pool->vaddr = dma_pool_alloc(pool->handle, GFP_KERNEL,
1094                                                         &pool->paddr);
1095 
1096                 if (!pool->vaddr)
1097                         goto dma_pool_setup_error;
1098 
1099                 bufsize = bufsize * 2;
1100         }
1101 
1102         return 0;
1103 
1104 dma_pool_setup_error:
1105 
1106         mraid_mm_teardown_dma_pools(adp);
1107         return (-ENOMEM);
1108 }
1109 
1110 
1111 /**
1112  * mraid_mm_unregister_adp - Unregister routine for low level drivers
1113  * @unique_id   : UID of the adpater
1114  *
1115  * Assumes no outstanding ioctls to llds.
1116  */
1117 int
1118 mraid_mm_unregister_adp(uint32_t unique_id)
1119 {
1120         mraid_mmadp_t   *adapter;
1121         mraid_mmadp_t   *tmp;
1122 
1123         list_for_each_entry_safe(adapter, tmp, &adapters_list_g, list) {
1124 
1125 
1126                 if (adapter->unique_id == unique_id) {
1127 
1128                         adapters_count_g--;
1129 
1130                         list_del_init(&adapter->list);
1131 
1132                         mraid_mm_free_adp_resources(adapter);
1133 
1134                         kfree(adapter);
1135 
1136                         con_log(CL_ANN, (
1137                                 "megaraid cmm: Unregistered one adapter:%#x\n",
1138                                 unique_id));
1139 
1140                         return 0;
1141                 }
1142         }
1143 
1144         return (-ENODEV);
1145 }
1146 
1147 /**
1148  * mraid_mm_free_adp_resources - Free adapter softstate
1149  * @adp : Adapter softstate
1150  */
1151 static void
1152 mraid_mm_free_adp_resources(mraid_mmadp_t *adp)
1153 {
1154         uioc_t  *kioc;
1155         int     i;
1156 
1157         mraid_mm_teardown_dma_pools(adp);
1158 
1159         for (i = 0; i < adp->max_kioc; i++) {
1160 
1161                 kioc = adp->kioc_list + i;
1162 
1163                 dma_pool_free(adp->pthru_dma_pool, kioc->pthru32,
1164                                 kioc->pthru32_h);
1165         }
1166 
1167         kfree(adp->kioc_list);
1168         kfree(adp->mbox_list);
1169 
1170         dma_pool_destroy(adp->pthru_dma_pool);
1171 
1172 
1173         return;
1174 }
1175 
1176 
1177 /**
1178  * mraid_mm_teardown_dma_pools - Free all per adapter dma buffers
1179  * @adp : Adapter softstate
1180  */
1181 static void
1182 mraid_mm_teardown_dma_pools(mraid_mmadp_t *adp)
1183 {
1184         int             i;
1185         mm_dmapool_t    *pool;
1186 
1187         for (i = 0; i < MAX_DMA_POOLS; i++) {
1188 
1189                 pool = &adp->dma_pool_list[i];
1190 
1191                 if (pool->handle) {
1192 
1193                         if (pool->vaddr)
1194                                 dma_pool_free(pool->handle, pool->vaddr,
1195                                                         pool->paddr);
1196 
1197                         dma_pool_destroy(pool->handle);
1198                         pool->handle = NULL;
1199                 }
1200         }
1201 
1202         return;
1203 }
1204 
1205 /**
1206  * mraid_mm_init        - Module entry point
1207  */
1208 static int __init
1209 mraid_mm_init(void)
1210 {
1211         int err;
1212 
1213         // Announce the driver version
1214         con_log(CL_ANN, (KERN_INFO "megaraid cmm: %s %s\n",
1215                 LSI_COMMON_MOD_VERSION, LSI_COMMON_MOD_EXT_VERSION));
1216 
1217         err = misc_register(&megaraid_mm_dev);
1218         if (err < 0) {
1219                 con_log(CL_ANN, ("megaraid cmm: cannot register misc device\n"));
1220                 return err;
1221         }
1222 
1223         init_waitqueue_head(&wait_q);
1224 
1225         INIT_LIST_HEAD(&adapters_list_g);
1226 
1227         return 0;
1228 }
1229 
1230 
1231 #ifdef CONFIG_COMPAT
1232 /**
1233  * mraid_mm_compat_ioctl        - 32bit to 64bit ioctl conversion routine
1234  * @filep       : file operations pointer (ignored)
1235  * @cmd         : ioctl command
1236  * @arg         : user ioctl packet
1237  */
1238 static long
1239 mraid_mm_compat_ioctl(struct file *filep, unsigned int cmd,
1240                       unsigned long arg)
1241 {
1242         int err;
1243 
1244         err = mraid_mm_ioctl(filep, cmd, arg);
1245 
1246         return err;
1247 }
1248 #endif
1249 
1250 /**
1251  * mraid_mm_exit        - Module exit point
1252  */
1253 static void __exit
1254 mraid_mm_exit(void)
1255 {
1256         con_log(CL_DLEVEL1 , ("exiting common mod\n"));
1257 
1258         misc_deregister(&megaraid_mm_dev);
1259 }
1260 
1261 module_init(mraid_mm_init);
1262 module_exit(mraid_mm_exit);
1263 
1264 /* vi: set ts=8 sw=8 tw=78: */
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/scsi/megaraid/megaraid_mm.c

DEFINITIONS
