The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/twa/tw_osl_freebsd.c

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    1 /*
    2  * Copyright (c) 2004-07 Applied Micro Circuits Corporation.
    3  * Copyright (c) 2004-05 Vinod Kashyap.
    4  * Copyright (c) 2000 Michael Smith
    5  * Copyright (c) 2000 BSDi
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $FreeBSD: releng/8.1/sys/dev/twa/tw_osl_freebsd.c 192450 2009-05-20 17:29:21Z imp $
   30  */
   31 
   32 /*
   33  * AMCC'S 3ware driver for 9000 series storage controllers.
   34  *
   35  * Author: Vinod Kashyap
   36  * Modifications by: Adam Radford
   37  * Modifications by: Manjunath Ranganathaiah
   38  */
   39 
   40 
   41 /*
   42  * FreeBSD specific functions not related to CAM, and other
   43  * miscellaneous functions.
   44  */
   45 
   46 
   47 #include <dev/twa/tw_osl_includes.h>
   48 #include <dev/twa/tw_cl_fwif.h>
   49 #include <dev/twa/tw_cl_ioctl.h>
   50 #include <dev/twa/tw_osl_ioctl.h>
   51 
   52 #ifdef TW_OSL_DEBUG
   53 TW_INT32        TW_DEBUG_LEVEL_FOR_OSL = TW_OSL_DEBUG;
   54 TW_INT32        TW_OSL_DEBUG_LEVEL_FOR_CL = TW_OSL_DEBUG;
   55 #endif /* TW_OSL_DEBUG */
   56 
   57 MALLOC_DEFINE(TW_OSLI_MALLOC_CLASS, "twa_commands", "twa commands");
   58 
   59 
   60 static  d_open_t                twa_open;
   61 static  d_close_t               twa_close;
   62 static  d_ioctl_t               twa_ioctl;
   63 
   64 static struct cdevsw twa_cdevsw = {
   65         .d_version =    D_VERSION,
   66         .d_open =       twa_open,
   67         .d_close =      twa_close,
   68         .d_ioctl =      twa_ioctl,
   69         .d_name =       "twa",
   70 };
   71 
   72 static devclass_t       twa_devclass;
   73 
   74 
   75 /*
   76  * Function name:       twa_open
   77  * Description:         Called when the controller is opened.
   78  *                      Simply marks the controller as open.
   79  *
   80  * Input:               dev     -- control device corresponding to the ctlr
   81  *                      flags   -- mode of open
   82  *                      fmt     -- device type (character/block etc.)
   83  *                      proc    -- current process
   84  * Output:              None
   85  * Return value:        0       -- success
   86  *                      non-zero-- failure
   87  */
   88 static TW_INT32
   89 twa_open(struct cdev *dev, TW_INT32 flags, TW_INT32 fmt, struct thread *proc)
   90 {
   91         struct twa_softc        *sc = (struct twa_softc *)(dev->si_drv1);
   92 
   93         tw_osli_dbg_dprintf(5, sc, "entered");
   94         sc->state |= TW_OSLI_CTLR_STATE_OPEN;
   95         return(0);
   96 }
   97 
   98 
   99 
  100 /*
  101  * Function name:       twa_close
  102  * Description:         Called when the controller is closed.
  103  *                      Simply marks the controller as not open.
  104  *
  105  * Input:               dev     -- control device corresponding to the ctlr
  106  *                      flags   -- mode of corresponding open
  107  *                      fmt     -- device type (character/block etc.)
  108  *                      proc    -- current process
  109  * Output:              None
  110  * Return value:        0       -- success
  111  *                      non-zero-- failure
  112  */
  113 static TW_INT32
  114 twa_close(struct cdev *dev, TW_INT32 flags, TW_INT32 fmt, struct thread *proc)
  115 {
  116         struct twa_softc        *sc = (struct twa_softc *)(dev->si_drv1);
  117 
  118         tw_osli_dbg_dprintf(5, sc, "entered");
  119         sc->state &= ~TW_OSLI_CTLR_STATE_OPEN;
  120         return(0);
  121 }
  122 
  123 
  124 
  125 /*
  126  * Function name:       twa_ioctl
  127  * Description:         Called when an ioctl is posted to the controller.
  128  *                      Handles any OS Layer specific cmds, passes the rest
  129  *                      on to the Common Layer.
  130  *
  131  * Input:               dev     -- control device corresponding to the ctlr
  132  *                      cmd     -- ioctl cmd
  133  *                      buf     -- ptr to buffer in kernel memory, which is
  134  *                                 a copy of the input buffer in user-space
  135  *                      flags   -- mode of corresponding open
  136  *                      proc    -- current process
  137  * Output:              buf     -- ptr to buffer in kernel memory, which will
  138  *                                 be copied to the output buffer in user-space
  139  * Return value:        0       -- success
  140  *                      non-zero-- failure
  141  */
  142 static TW_INT32
  143 twa_ioctl(struct cdev *dev, u_long cmd, caddr_t buf, TW_INT32 flags, struct thread *proc)
  144 {
  145         struct twa_softc        *sc = (struct twa_softc *)(dev->si_drv1);
  146         TW_INT32                error;
  147 
  148         tw_osli_dbg_dprintf(5, sc, "entered");
  149 
  150         switch (cmd) {
  151         case TW_OSL_IOCTL_FIRMWARE_PASS_THROUGH:
  152                 tw_osli_dbg_dprintf(6, sc, "ioctl: fw_passthru");
  153                 error = tw_osli_fw_passthru(sc, (TW_INT8 *)buf);
  154                 break;
  155 
  156         case TW_OSL_IOCTL_SCAN_BUS:
  157                 /* Request CAM for a bus scan. */
  158                 tw_osli_dbg_dprintf(6, sc, "ioctl: scan bus");
  159                 error = tw_osli_request_bus_scan(sc);
  160                 break;
  161 
  162         default:
  163                 tw_osli_dbg_dprintf(6, sc, "ioctl: 0x%lx", cmd);
  164                 error = tw_cl_ioctl(&sc->ctlr_handle, cmd, buf);
  165                 break;
  166         }
  167         return(error);
  168 }
  169 
  170 
  171 
  172 static TW_INT32 twa_probe(device_t dev);
  173 static TW_INT32 twa_attach(device_t dev);
  174 static TW_INT32 twa_detach(device_t dev);
  175 static TW_INT32 twa_shutdown(device_t dev);
  176 static TW_VOID  twa_busdma_lock(TW_VOID *lock_arg, bus_dma_lock_op_t op);
  177 #ifdef TW_OSLI_DEFERRED_INTR_USED
  178 static int      twa_pci_intr_fast(TW_VOID *arg);
  179 static TW_VOID  twa_deferred_intr(TW_VOID *context, TW_INT32 pending);
  180 #else
  181 static TW_VOID  twa_pci_intr(TW_VOID *arg);
  182 #endif /* TW_OSLI_DEFERRED_INTR_USED */
  183 
  184 static TW_INT32 tw_osli_alloc_mem(struct twa_softc *sc);
  185 static TW_VOID  tw_osli_free_resources(struct twa_softc *sc);
  186 
  187 static TW_VOID  twa_map_load_data_callback(TW_VOID *arg,
  188         bus_dma_segment_t *segs, TW_INT32 nsegments, TW_INT32 error);
  189 static TW_VOID  twa_map_load_callback(TW_VOID *arg,
  190         bus_dma_segment_t *segs, TW_INT32 nsegments, TW_INT32 error);
  191 
  192 
  193 static device_method_t  twa_methods[] = {
  194         /* Device interface */
  195         DEVMETHOD(device_probe,         twa_probe),
  196         DEVMETHOD(device_attach,        twa_attach),
  197         DEVMETHOD(device_detach,        twa_detach),
  198         DEVMETHOD(device_shutdown,      twa_shutdown),
  199 
  200         DEVMETHOD(bus_print_child,      bus_generic_print_child),
  201         DEVMETHOD(bus_driver_added,     bus_generic_driver_added),
  202         {0, 0}
  203 };
  204 
  205 static driver_t twa_pci_driver = {
  206         "twa",
  207         twa_methods,
  208         sizeof(struct twa_softc)
  209 };
  210 
  211 DRIVER_MODULE(twa, pci, twa_pci_driver, twa_devclass, 0, 0);
  212 MODULE_DEPEND(twa, cam, 1, 1, 1);
  213 MODULE_DEPEND(twa, pci, 1, 1, 1);
  214 
  215 
  216 /*
  217  * Function name:       twa_probe
  218  * Description:         Called at driver load time.  Claims 9000 ctlrs.
  219  *
  220  * Input:               dev     -- bus device corresponding to the ctlr
  221  * Output:              None
  222  * Return value:        <= 0    -- success
  223  *                      > 0     -- failure
  224  */
  225 static TW_INT32
  226 twa_probe(device_t dev)
  227 {
  228         static TW_UINT8 first_ctlr = 1;
  229 
  230         tw_osli_dbg_printf(3, "entered");
  231 
  232         if (tw_cl_ctlr_supported(pci_get_vendor(dev), pci_get_device(dev))) {
  233                 device_set_desc(dev, TW_OSLI_DEVICE_NAME);
  234                 /* Print the driver version only once. */
  235                 if (first_ctlr) {
  236                         printf("3ware device driver for 9000 series storage "
  237                                 "controllers, version: %s\n",
  238                                 TW_OSL_DRIVER_VERSION_STRING);
  239                         first_ctlr = 0;
  240                 }
  241                 return(0);
  242         }
  243         return(ENXIO);
  244 }
  245 
  246 
  247 
  248 /*
  249  * Function name:       twa_attach
  250  * Description:         Allocates pci resources; updates sc; adds a node to the
  251  *                      sysctl tree to expose the driver version; makes calls
  252  *                      (to the Common Layer) to initialize ctlr, and to
  253  *                      attach to CAM.
  254  *
  255  * Input:               dev     -- bus device corresponding to the ctlr
  256  * Output:              None
  257  * Return value:        0       -- success
  258  *                      non-zero-- failure
  259  */
  260 static TW_INT32
  261 twa_attach(device_t dev)
  262 {
  263         struct twa_softc        *sc = device_get_softc(dev);
  264         TW_UINT32               command;
  265         TW_INT32                bar_num;
  266         TW_INT32                bar0_offset;
  267         TW_INT32                bar_size;
  268         TW_INT32                error;
  269 
  270         tw_osli_dbg_dprintf(3, sc, "entered");
  271 
  272         sc->ctlr_handle.osl_ctlr_ctxt = sc;
  273 
  274         /* Initialize the softc structure. */
  275         sc->bus_dev = dev;
  276         sc->device_id = pci_get_device(dev);
  277 
  278         /* Initialize the mutexes right here. */
  279         sc->io_lock = &(sc->io_lock_handle);
  280         mtx_init(sc->io_lock, "tw_osl_io_lock", NULL, MTX_SPIN);
  281         sc->q_lock = &(sc->q_lock_handle);
  282         mtx_init(sc->q_lock, "tw_osl_q_lock", NULL, MTX_SPIN);
  283         sc->sim_lock = &(sc->sim_lock_handle);
  284         mtx_init(sc->sim_lock, "tw_osl_sim_lock", NULL, MTX_DEF | MTX_RECURSE);
  285 
  286         sysctl_ctx_init(&sc->sysctl_ctxt);
  287         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctxt,
  288                 SYSCTL_STATIC_CHILDREN(_hw), OID_AUTO,
  289                 device_get_nameunit(dev), CTLFLAG_RD, 0, "");
  290         if (sc->sysctl_tree == NULL) {
  291                 tw_osli_printf(sc, "error = %d",
  292                         TW_CL_SEVERITY_ERROR_STRING,
  293                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  294                         0x2000,
  295                         "Cannot add sysctl tree node",
  296                         ENXIO);
  297                 return(ENXIO);
  298         }
  299         SYSCTL_ADD_STRING(&sc->sysctl_ctxt, SYSCTL_CHILDREN(sc->sysctl_tree),
  300                 OID_AUTO, "driver_version", CTLFLAG_RD,
  301                 TW_OSL_DRIVER_VERSION_STRING, 0, "TWA driver version");
  302 
  303         /* Make sure we are going to be able to talk to this board. */
  304         command = pci_read_config(dev, PCIR_COMMAND, 2);
  305         if ((command & PCIM_CMD_PORTEN) == 0) {
  306                 tw_osli_printf(sc, "error = %d",
  307                         TW_CL_SEVERITY_ERROR_STRING,
  308                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  309                         0x2001,
  310                         "Register window not available",
  311                         ENXIO);
  312                 tw_osli_free_resources(sc);
  313                 return(ENXIO);
  314         }
  315 
  316         /* Force the busmaster enable bit on, in case the BIOS forgot. */
  317         command |= PCIM_CMD_BUSMASTEREN;
  318         pci_write_config(dev, PCIR_COMMAND, command, 2);
  319 
  320         /* Allocate the PCI register window. */
  321         if ((error = tw_cl_get_pci_bar_info(sc->device_id, TW_CL_BAR_TYPE_MEM,
  322                 &bar_num, &bar0_offset, &bar_size))) {
  323                 tw_osli_printf(sc, "error = %d",
  324                         TW_CL_SEVERITY_ERROR_STRING,
  325                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  326                         0x201F,
  327                         "Can't get PCI BAR info",
  328                         error);
  329                 tw_osli_free_resources(sc);
  330                 return(error);
  331         }
  332         sc->reg_res_id = PCIR_BARS + bar0_offset;
  333         if ((sc->reg_res = bus_alloc_resource(dev, SYS_RES_MEMORY,
  334                                 &(sc->reg_res_id), 0, ~0, 1, RF_ACTIVE))
  335                                 == NULL) {
  336                 tw_osli_printf(sc, "error = %d",
  337                         TW_CL_SEVERITY_ERROR_STRING,
  338                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  339                         0x2002,
  340                         "Can't allocate register window",
  341                         ENXIO);
  342                 tw_osli_free_resources(sc);
  343                 return(ENXIO);
  344         }
  345         sc->bus_tag = rman_get_bustag(sc->reg_res);
  346         sc->bus_handle = rman_get_bushandle(sc->reg_res);
  347 
  348         /* Allocate and register our interrupt. */
  349         sc->irq_res_id = 0;
  350         if ((sc->irq_res = bus_alloc_resource(sc->bus_dev, SYS_RES_IRQ,
  351                                 &(sc->irq_res_id), 0, ~0, 1,
  352                                 RF_SHAREABLE | RF_ACTIVE)) == NULL) {
  353                 tw_osli_printf(sc, "error = %d",
  354                         TW_CL_SEVERITY_ERROR_STRING,
  355                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  356                         0x2003,
  357                         "Can't allocate interrupt",
  358                         ENXIO);
  359                 tw_osli_free_resources(sc);
  360                 return(ENXIO);
  361         }
  362         if ((error = bus_setup_intr(sc->bus_dev, sc->irq_res,
  363 #ifdef TW_OSLI_DEFERRED_INTR_USED
  364                         INTR_TYPE_CAM | INTR_FAST,
  365                         twa_pci_intr_fast, NULL,
  366 #else
  367                         INTR_TYPE_CAM | INTR_MPSAFE,
  368                         NULL, twa_pci_intr,         
  369 #endif 
  370                         sc, &sc->intr_handle))) {
  371                 tw_osli_printf(sc, "error = %d",
  372                         TW_CL_SEVERITY_ERROR_STRING,
  373                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  374                         0x2004,
  375                         "Can't set up interrupt",
  376                         error);
  377                 tw_osli_free_resources(sc);
  378                 return(error);
  379         }
  380 
  381 #ifdef TW_OSLI_DEFERRED_INTR_USED
  382         TASK_INIT(&sc->deferred_intr_callback, 0, twa_deferred_intr, sc);
  383 #endif /* TW_OSLI_DEFERRED_INTR_USED */
  384 
  385         if ((error = tw_osli_alloc_mem(sc))) {
  386                 tw_osli_printf(sc, "error = %d",
  387                         TW_CL_SEVERITY_ERROR_STRING,
  388                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  389                         0x2005,
  390                         "Memory allocation failure",
  391                         error);
  392                 tw_osli_free_resources(sc);
  393                 return(error);
  394         }
  395 
  396         /* Initialize the Common Layer for this controller. */
  397         if ((error = tw_cl_init_ctlr(&sc->ctlr_handle, sc->flags, sc->device_id,
  398                         TW_OSLI_MAX_NUM_IOS, TW_OSLI_MAX_NUM_AENS,
  399                         sc->non_dma_mem, sc->dma_mem,
  400                         sc->dma_mem_phys
  401                         ))) {
  402                 tw_osli_printf(sc, "error = %d",
  403                         TW_CL_SEVERITY_ERROR_STRING,
  404                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  405                         0x2006,
  406                         "Failed to initialize Common Layer/controller",
  407                         error);
  408                 tw_osli_free_resources(sc);
  409                 return(error);
  410         }
  411 
  412         /* Create the control device. */
  413         sc->ctrl_dev = make_dev(&twa_cdevsw, device_get_unit(sc->bus_dev),
  414                         UID_ROOT, GID_OPERATOR, S_IRUSR | S_IWUSR,
  415                         "twa%d", device_get_unit(sc->bus_dev));
  416         sc->ctrl_dev->si_drv1 = sc;
  417 
  418         if ((error = tw_osli_cam_attach(sc))) {
  419                 tw_osli_free_resources(sc);
  420                 tw_osli_printf(sc, "error = %d",
  421                         TW_CL_SEVERITY_ERROR_STRING,
  422                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  423                         0x2007,
  424                         "Failed to initialize CAM",
  425                         error);
  426                 return(error);
  427         }
  428 
  429         return(0);
  430 }
  431 
  432 
  433 
  434 /*
  435  * Function name:       tw_osli_alloc_mem
  436  * Description:         Allocates memory needed both by CL and OSL.
  437  *
  438  * Input:               sc      -- OSL internal controller context
  439  * Output:              None
  440  * Return value:        0       -- success
  441  *                      non-zero-- failure
  442  */
  443 static TW_INT32
  444 tw_osli_alloc_mem(struct twa_softc *sc)
  445 {
  446         struct tw_osli_req_context      *req;
  447         TW_UINT32                       max_sg_elements;
  448         TW_UINT32                       non_dma_mem_size;
  449         TW_UINT32                       dma_mem_size;
  450         TW_INT32                        error;
  451         TW_INT32                        i;
  452 
  453         tw_osli_dbg_dprintf(3, sc, "entered");
  454 
  455         sc->flags |= (sizeof(bus_addr_t) == 8) ? TW_CL_64BIT_ADDRESSES : 0;
  456         sc->flags |= (sizeof(bus_size_t) == 8) ? TW_CL_64BIT_SG_LENGTH : 0;
  457 #ifdef TW_OSLI_DEFERRED_INTR_USED
  458         sc->flags |= TW_CL_DEFERRED_INTR_USED; 
  459 #endif /* TW_OSLI_DEFERRED_INTR_USED */
  460 
  461         max_sg_elements = (sizeof(bus_addr_t) == 8) ?
  462                 TW_CL_MAX_64BIT_SG_ELEMENTS : TW_CL_MAX_32BIT_SG_ELEMENTS;
  463 
  464         if ((error = tw_cl_get_mem_requirements(&sc->ctlr_handle, sc->flags,
  465                         sc->device_id, TW_OSLI_MAX_NUM_IOS,  TW_OSLI_MAX_NUM_AENS,
  466                         &(sc->alignment), &(sc->sg_size_factor),
  467                         &non_dma_mem_size, &dma_mem_size
  468                         ))) {
  469                 tw_osli_printf(sc, "error = %d",
  470                         TW_CL_SEVERITY_ERROR_STRING,
  471                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  472                         0x2008,
  473                         "Can't get Common Layer's memory requirements",
  474                         error);
  475                 return(error);
  476         }
  477 
  478         if ((sc->non_dma_mem = malloc(non_dma_mem_size, TW_OSLI_MALLOC_CLASS,
  479                                 M_WAITOK)) == NULL) {
  480                 tw_osli_printf(sc, "error = %d",
  481                         TW_CL_SEVERITY_ERROR_STRING,
  482                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  483                         0x2009,
  484                         "Can't allocate non-dma memory",
  485                         ENOMEM);
  486                 return(ENOMEM);
  487         }
  488 
  489         /* Create the parent dma tag. */
  490         if (bus_dma_tag_create(NULL,                    /* parent */
  491                                 sc->alignment,          /* alignment */
  492                                 TW_OSLI_DMA_BOUNDARY,   /* boundary */
  493                                 BUS_SPACE_MAXADDR,      /* lowaddr */
  494                                 BUS_SPACE_MAXADDR,      /* highaddr */
  495                                 NULL, NULL,             /* filter, filterarg */
  496                                 TW_CL_MAX_IO_SIZE,      /* maxsize */
  497                                 max_sg_elements,        /* nsegments */
  498                                 TW_CL_MAX_IO_SIZE,      /* maxsegsize */
  499                                 0,                      /* flags */
  500                                 NULL,                   /* lockfunc */
  501                                 NULL,                   /* lockfuncarg */
  502                                 &sc->parent_tag         /* tag */)) {
  503                 tw_osli_printf(sc, "error = %d",
  504                         TW_CL_SEVERITY_ERROR_STRING,
  505                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  506                         0x200A,
  507                         "Can't allocate parent DMA tag",
  508                         ENOMEM);
  509                 return(ENOMEM);
  510         }
  511 
  512         /* Create a dma tag for Common Layer's DMA'able memory (dma_mem). */
  513         if (bus_dma_tag_create(sc->parent_tag,          /* parent */
  514                                 sc->alignment,          /* alignment */
  515                                 0,                      /* boundary */
  516                                 BUS_SPACE_MAXADDR,      /* lowaddr */
  517                                 BUS_SPACE_MAXADDR,      /* highaddr */
  518                                 NULL, NULL,             /* filter, filterarg */
  519                                 dma_mem_size,           /* maxsize */
  520                                 1,                      /* nsegments */
  521                                 BUS_SPACE_MAXSIZE,      /* maxsegsize */
  522                                 0,                      /* flags */
  523                                 NULL,                   /* lockfunc */
  524                                 NULL,                   /* lockfuncarg */
  525                                 &sc->cmd_tag            /* tag */)) {
  526                 tw_osli_printf(sc, "error = %d",
  527                         TW_CL_SEVERITY_ERROR_STRING,
  528                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  529                         0x200B,
  530                         "Can't allocate DMA tag for Common Layer's "
  531                         "DMA'able memory",
  532                         ENOMEM);
  533                 return(ENOMEM);
  534         }
  535 
  536         if (bus_dmamem_alloc(sc->cmd_tag, &sc->dma_mem,
  537                 BUS_DMA_NOWAIT, &sc->cmd_map)) {
  538                 /* Try a second time. */
  539                 if (bus_dmamem_alloc(sc->cmd_tag, &sc->dma_mem,
  540                         BUS_DMA_NOWAIT, &sc->cmd_map)) {
  541                         tw_osli_printf(sc, "error = %d",
  542                                 TW_CL_SEVERITY_ERROR_STRING,
  543                                 TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  544                                 0x200C,
  545                                 "Can't allocate DMA'able memory for the"
  546                                 "Common Layer",
  547                                 ENOMEM);
  548                         return(ENOMEM);
  549                 }
  550         }
  551 
  552         bus_dmamap_load(sc->cmd_tag, sc->cmd_map, sc->dma_mem,
  553                 dma_mem_size, twa_map_load_callback,
  554                 &sc->dma_mem_phys, 0);
  555 
  556         /*
  557          * Create a dma tag for data buffers; size will be the maximum
  558          * possible I/O size (128kB).
  559          */
  560         if (bus_dma_tag_create(sc->parent_tag,          /* parent */
  561                                 sc->alignment,          /* alignment */
  562                                 0,                      /* boundary */
  563                                 BUS_SPACE_MAXADDR,      /* lowaddr */
  564                                 BUS_SPACE_MAXADDR,      /* highaddr */
  565                                 NULL, NULL,             /* filter, filterarg */
  566                                 TW_CL_MAX_IO_SIZE,      /* maxsize */
  567                                 max_sg_elements,        /* nsegments */
  568                                 TW_CL_MAX_IO_SIZE,      /* maxsegsize */
  569                                 BUS_DMA_ALLOCNOW,       /* flags */
  570                                 twa_busdma_lock,        /* lockfunc */
  571                                 sc->io_lock,            /* lockfuncarg */
  572                                 &sc->dma_tag            /* tag */)) {
  573                 tw_osli_printf(sc, "error = %d",
  574                         TW_CL_SEVERITY_ERROR_STRING,
  575                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  576                         0x200F,
  577                         "Can't allocate DMA tag for data buffers",
  578                         ENOMEM);
  579                 return(ENOMEM);
  580         }
  581 
  582         /*
  583          * Create a dma tag for ioctl data buffers; size will be the maximum
  584          * possible I/O size (128kB).
  585          */
  586         if (bus_dma_tag_create(sc->parent_tag,          /* parent */
  587                                 sc->alignment,          /* alignment */
  588                                 0,                      /* boundary */
  589                                 BUS_SPACE_MAXADDR,      /* lowaddr */
  590                                 BUS_SPACE_MAXADDR,      /* highaddr */
  591                                 NULL, NULL,             /* filter, filterarg */
  592                                 TW_CL_MAX_IO_SIZE,      /* maxsize */
  593                                 max_sg_elements,        /* nsegments */
  594                                 TW_CL_MAX_IO_SIZE,      /* maxsegsize */
  595                                 BUS_DMA_ALLOCNOW,       /* flags */
  596                                 twa_busdma_lock,        /* lockfunc */
  597                                 sc->io_lock,            /* lockfuncarg */
  598                                 &sc->ioctl_tag          /* tag */)) {
  599                 tw_osli_printf(sc, "error = %d",
  600                         TW_CL_SEVERITY_ERROR_STRING,
  601                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  602                         0x2010,
  603                         "Can't allocate DMA tag for ioctl data buffers",
  604                         ENOMEM);
  605                 return(ENOMEM);
  606         }
  607 
  608         /* Create just one map for all ioctl request data buffers. */
  609         if (bus_dmamap_create(sc->ioctl_tag, 0, &sc->ioctl_map)) {
  610                 tw_osli_printf(sc, "error = %d",
  611                         TW_CL_SEVERITY_ERROR_STRING,
  612                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  613                         0x2011,
  614                         "Can't create ioctl map",
  615                         ENOMEM);
  616                 return(ENOMEM);
  617         }
  618 
  619 
  620         /* Initialize request queues. */
  621         tw_osli_req_q_init(sc, TW_OSLI_FREE_Q);
  622         tw_osli_req_q_init(sc, TW_OSLI_BUSY_Q);
  623 
  624         if ((sc->req_ctxt_buf = (struct tw_osli_req_context *)
  625                         malloc((sizeof(struct tw_osli_req_context) *
  626                                 TW_OSLI_MAX_NUM_IOS),
  627                                 TW_OSLI_MALLOC_CLASS, M_WAITOK)) == NULL) {
  628                 tw_osli_printf(sc, "error = %d",
  629                         TW_CL_SEVERITY_ERROR_STRING,
  630                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  631                         0x2012,
  632                         "Failed to allocate request packets",
  633                         ENOMEM);
  634                 return(ENOMEM);
  635         }
  636         bzero(sc->req_ctxt_buf,
  637                 sizeof(struct tw_osli_req_context) * TW_OSLI_MAX_NUM_IOS);
  638 
  639         for (i = 0; i < TW_OSLI_MAX_NUM_IOS; i++) {
  640                 req = &(sc->req_ctxt_buf[i]);
  641                 req->ctlr = sc;
  642                 if (bus_dmamap_create(sc->dma_tag, 0, &req->dma_map)) {
  643                         tw_osli_printf(sc, "request # = %d, error = %d",
  644                                 TW_CL_SEVERITY_ERROR_STRING,
  645                                 TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  646                                 0x2013,
  647                                 "Can't create dma map",
  648                                 i, ENOMEM);
  649                         return(ENOMEM);
  650                 }
  651 
  652                 /* Insert request into the free queue. */
  653                 tw_osli_req_q_insert_tail(req, TW_OSLI_FREE_Q);
  654         }
  655 
  656         return(0);
  657 }
  658 
  659 
  660 
  661 /*
  662  * Function name:       tw_osli_free_resources
  663  * Description:         Performs clean-up at the time of going down.
  664  *
  665  * Input:               sc      -- ptr to OSL internal ctlr context
  666  * Output:              None
  667  * Return value:        None
  668  */
  669 static TW_VOID
  670 tw_osli_free_resources(struct twa_softc *sc)
  671 {
  672         struct tw_osli_req_context      *req;
  673         TW_INT32                        error = 0;
  674 
  675         tw_osli_dbg_dprintf(3, sc, "entered");
  676 
  677         /* Detach from CAM */
  678         tw_osli_cam_detach(sc);
  679 
  680         if (sc->req_ctxt_buf)
  681                 while ((req = tw_osli_req_q_remove_head(sc, TW_OSLI_FREE_Q)) !=
  682                         NULL)
  683                         if ((error = bus_dmamap_destroy(sc->dma_tag,
  684                                         req->dma_map)))
  685                                 tw_osli_dbg_dprintf(1, sc,
  686                                         "dmamap_destroy(dma) returned %d",
  687                                         error);
  688 
  689         if ((sc->ioctl_tag) && (sc->ioctl_map))
  690                 if ((error = bus_dmamap_destroy(sc->ioctl_tag, sc->ioctl_map)))
  691                         tw_osli_dbg_dprintf(1, sc,
  692                                 "dmamap_destroy(ioctl) returned %d", error);
  693 
  694         /* Free all memory allocated so far. */
  695         if (sc->req_ctxt_buf)
  696                 free(sc->req_ctxt_buf, TW_OSLI_MALLOC_CLASS);
  697 
  698         if (sc->non_dma_mem)
  699                 free(sc->non_dma_mem, TW_OSLI_MALLOC_CLASS);
  700 
  701         if (sc->dma_mem) {
  702                 bus_dmamap_unload(sc->cmd_tag, sc->cmd_map);
  703                 bus_dmamem_free(sc->cmd_tag, sc->dma_mem,
  704                         sc->cmd_map);
  705         }
  706         if (sc->cmd_tag)
  707                 if ((error = bus_dma_tag_destroy(sc->cmd_tag)))
  708                         tw_osli_dbg_dprintf(1, sc,
  709                                 "dma_tag_destroy(cmd) returned %d", error);
  710 
  711         if (sc->dma_tag)
  712                 if ((error = bus_dma_tag_destroy(sc->dma_tag)))
  713                         tw_osli_dbg_dprintf(1, sc,
  714                                 "dma_tag_destroy(dma) returned %d", error);
  715 
  716         if (sc->ioctl_tag)
  717                 if ((error = bus_dma_tag_destroy(sc->ioctl_tag)))
  718                         tw_osli_dbg_dprintf(1, sc,
  719                                 "dma_tag_destroy(ioctl) returned %d", error);
  720 
  721         if (sc->parent_tag)
  722                 if ((error = bus_dma_tag_destroy(sc->parent_tag)))
  723                         tw_osli_dbg_dprintf(1, sc,
  724                                 "dma_tag_destroy(parent) returned %d", error);
  725 
  726 
  727         /* Disconnect the interrupt handler. */
  728         if (sc->intr_handle)
  729                 if ((error = bus_teardown_intr(sc->bus_dev,
  730                                 sc->irq_res, sc->intr_handle)))
  731                         tw_osli_dbg_dprintf(1, sc,
  732                                 "teardown_intr returned %d", error);
  733 
  734         if (sc->irq_res != NULL)
  735                 if ((error = bus_release_resource(sc->bus_dev,
  736                                 SYS_RES_IRQ, sc->irq_res_id, sc->irq_res)))
  737                         tw_osli_dbg_dprintf(1, sc,
  738                                 "release_resource(irq) returned %d", error);
  739 
  740 
  741         /* Release the register window mapping. */
  742         if (sc->reg_res != NULL)
  743                 if ((error = bus_release_resource(sc->bus_dev,
  744                                 SYS_RES_MEMORY, sc->reg_res_id, sc->reg_res)))
  745                         tw_osli_dbg_dprintf(1, sc,
  746                                 "release_resource(io) returned %d", error);
  747 
  748 
  749         /* Destroy the control device. */
  750         if (sc->ctrl_dev != (struct cdev *)NULL)
  751                 destroy_dev(sc->ctrl_dev);
  752 
  753         if ((error = sysctl_ctx_free(&sc->sysctl_ctxt)))
  754                 tw_osli_dbg_dprintf(1, sc,
  755                         "sysctl_ctx_free returned %d", error);
  756 
  757 }
  758 
  759 
  760 
  761 /*
  762  * Function name:       twa_detach
  763  * Description:         Called when the controller is being detached from
  764  *                      the pci bus.
  765  *
  766  * Input:               dev     -- bus device corresponding to the ctlr
  767  * Output:              None
  768  * Return value:        0       -- success
  769  *                      non-zero-- failure
  770  */
  771 static TW_INT32
  772 twa_detach(device_t dev)
  773 {
  774         struct twa_softc        *sc = device_get_softc(dev);
  775         TW_INT32                error;
  776 
  777         tw_osli_dbg_dprintf(3, sc, "entered");
  778 
  779         error = EBUSY;
  780         if (sc->state & TW_OSLI_CTLR_STATE_OPEN) {
  781                 tw_osli_printf(sc, "error = %d",
  782                         TW_CL_SEVERITY_ERROR_STRING,
  783                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  784                         0x2014,
  785                         "Device open",
  786                         error);
  787                 goto out;
  788         }
  789 
  790         /* Shut the controller down. */
  791         if ((error = twa_shutdown(dev)))
  792                 goto out;
  793 
  794         /* Free all resources associated with this controller. */
  795         tw_osli_free_resources(sc);
  796         error = 0;
  797 
  798 out:
  799         return(error);
  800 }
  801 
  802 
  803 
  804 /*
  805  * Function name:       twa_shutdown
  806  * Description:         Called at unload/shutdown time.  Lets the controller
  807  *                      know that we are going down.
  808  *
  809  * Input:               dev     -- bus device corresponding to the ctlr
  810  * Output:              None
  811  * Return value:        0       -- success
  812  *                      non-zero-- failure
  813  */
  814 static TW_INT32
  815 twa_shutdown(device_t dev)
  816 {
  817         struct twa_softc        *sc = device_get_softc(dev);
  818         TW_INT32                error = 0;
  819 
  820         tw_osli_dbg_dprintf(3, sc, "entered");
  821 
  822         /* Disconnect from the controller. */
  823         if ((error = tw_cl_shutdown_ctlr(&(sc->ctlr_handle), 0))) {
  824                 tw_osli_printf(sc, "error = %d",
  825                         TW_CL_SEVERITY_ERROR_STRING,
  826                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  827                         0x2015,
  828                         "Failed to shutdown Common Layer/controller",
  829                         error);
  830         }
  831         return(error);
  832 }
  833 
  834 
  835 
  836 /*
  837  * Function name:       twa_busdma_lock
  838  * Description:         Function to provide synchronization during busdma_swi.
  839  *
  840  * Input:               lock_arg -- lock mutex sent as argument
  841  *                      op -- operation (lock/unlock) expected of the function
  842  * Output:              None
  843  * Return value:        None
  844  */
  845 TW_VOID
  846 twa_busdma_lock(TW_VOID *lock_arg, bus_dma_lock_op_t op)
  847 {
  848         struct mtx      *lock;
  849 
  850         lock = (struct mtx *)lock_arg;
  851         switch (op) {
  852         case BUS_DMA_LOCK:
  853                 mtx_lock_spin(lock);
  854                 break;
  855 
  856         case BUS_DMA_UNLOCK:
  857                 mtx_unlock_spin(lock);
  858                 break;
  859 
  860         default:
  861                 panic("Unknown operation 0x%x for twa_busdma_lock!", op);
  862         }
  863 }
  864 
  865 
  866 #ifdef TW_OSLI_DEFERRED_INTR_USED
  867 /*
  868  * Function name:       twa_pci_intr_fast
  869  * Description:         Interrupt handler.  Wrapper for twa_interrupt.
  870  *
  871  * Input:               arg     -- ptr to OSL internal ctlr context
  872  * Output:              FILTER_HANDLED or FILTER_STRAY
  873  * Return value:        None
  874  */
  875 static int
  876 twa_pci_intr_fast(TW_VOID *arg)
  877 {
  878         struct twa_softc        *sc = (struct twa_softc *)arg;
  879 
  880         tw_osli_dbg_dprintf(10, sc, "entered");
  881         if (tw_cl_interrupt(&(sc->ctlr_handle))) {
  882                 taskqueue_enqueue_fast(taskqueue_fast,
  883                         &(sc->deferred_intr_callback));
  884                 return(FILTER_HANDLED);
  885         }
  886         return(FILTER_STRAY);
  887 }
  888 #else
  889 /*
  890  * Function name:       twa_pci_intr
  891  * Description:         Interrupt handler.  Wrapper for twa_interrupt.
  892  *
  893  * Input:               arg     -- ptr to OSL internal ctlr context
  894  * Output:              None
  895  * Return value:        None
  896  */
  897 static TW_VOID
  898 twa_pci_intr(TW_VOID *arg)
  899 {
  900         struct twa_softc        *sc = (struct twa_softc *)arg;
  901 
  902         tw_osli_dbg_dprintf(10, sc, "entered");
  903         if (tw_cl_interrupt(&(sc->ctlr_handle)))
  904                 tw_cl_deferred_interrupt(&(sc->ctlr_handle));
  905 }
  906 #endif
  907 
  908 #ifdef TW_OSLI_DEFERRED_INTR_USED
  909 
  910 /*
  911  * Function name:       twa_deferred_intr
  912  * Description:         Deferred interrupt handler.
  913  *
  914  * Input:               context -- ptr to OSL internal ctlr context
  915  *                      pending -- not used
  916  * Output:              None
  917  * Return value:        None
  918  */
  919 static TW_VOID
  920 twa_deferred_intr(TW_VOID *context, TW_INT32 pending)
  921 {
  922         struct twa_softc        *sc = (struct twa_softc *)context;
  923 
  924         tw_osli_dbg_dprintf(10, sc, "entered");
  925 
  926         tw_cl_deferred_interrupt(&(sc->ctlr_handle));
  927 }
  928 
  929 #endif /* TW_OSLI_DEFERRED_INTR_USED */
  930 
  931 
  932 
  933 /*
  934  * Function name:       tw_osli_fw_passthru
  935  * Description:         Builds a fw passthru cmd pkt, and submits it to CL.
  936  *
  937  * Input:               sc      -- ptr to OSL internal ctlr context
  938  *                      buf     -- ptr to ioctl pkt understood by CL
  939  * Output:              None
  940  * Return value:        0       -- success
  941  *                      non-zero-- failure
  942  */
  943 TW_INT32
  944 tw_osli_fw_passthru(struct twa_softc *sc, TW_INT8 *buf)
  945 {
  946         struct tw_osli_req_context              *req;
  947         struct tw_osli_ioctl_no_data_buf        *user_buf =
  948                 (struct tw_osli_ioctl_no_data_buf *)buf;
  949         TW_TIME                                 end_time;
  950         TW_UINT32                               timeout = 60;
  951         TW_UINT32                               data_buf_size_adjusted;
  952         struct tw_cl_req_packet                 *req_pkt;
  953         struct tw_cl_passthru_req_packet        *pt_req;
  954         TW_INT32                                error;
  955 
  956         tw_osli_dbg_dprintf(5, sc, "ioctl: passthru");
  957                 
  958         if ((req = tw_osli_get_request(sc)) == NULL)
  959                 return(EBUSY);
  960 
  961         req->req_handle.osl_req_ctxt = req;
  962         req->orig_req = buf;
  963         req->flags |= TW_OSLI_REQ_FLAGS_PASSTHRU;
  964 
  965         req_pkt = &(req->req_pkt);
  966         req_pkt->status = 0;
  967         req_pkt->tw_osl_callback = tw_osl_complete_passthru;
  968         /* Let the Common Layer retry the request on cmd queue full. */
  969         req_pkt->flags |= TW_CL_REQ_RETRY_ON_BUSY;
  970 
  971         pt_req = &(req_pkt->gen_req_pkt.pt_req);
  972         /*
  973          * Make sure that the data buffer sent to firmware is a 
  974          * 512 byte multiple in size.
  975          */
  976         data_buf_size_adjusted =
  977                 (user_buf->driver_pkt.buffer_length +
  978                 (sc->sg_size_factor - 1)) & ~(sc->sg_size_factor - 1);
  979         if ((req->length = data_buf_size_adjusted)) {
  980                 if ((req->data = malloc(data_buf_size_adjusted,
  981                         TW_OSLI_MALLOC_CLASS, M_WAITOK)) == NULL) {
  982                         error = ENOMEM;
  983                         tw_osli_printf(sc, "error = %d",
  984                                 TW_CL_SEVERITY_ERROR_STRING,
  985                                 TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  986                                 0x2016,
  987                                 "Could not alloc mem for "
  988                                 "fw_passthru data_buf",
  989                                 error);
  990                         goto fw_passthru_err;
  991                 }
  992                 /* Copy the payload. */
  993                 if ((error = copyin((TW_VOID *)(user_buf->pdata), 
  994                         req->data,
  995                         user_buf->driver_pkt.buffer_length)) != 0) {
  996                         tw_osli_printf(sc, "error = %d",
  997                                 TW_CL_SEVERITY_ERROR_STRING,
  998                                 TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  999                                 0x2017,
 1000                                 "Could not copyin fw_passthru data_buf",
 1001                                 error);
 1002                         goto fw_passthru_err;
 1003                 }
 1004                 pt_req->sgl_entries = 1; /* will be updated during mapping */
 1005                 req->flags |= (TW_OSLI_REQ_FLAGS_DATA_IN |
 1006                         TW_OSLI_REQ_FLAGS_DATA_OUT);
 1007         } else
 1008                 pt_req->sgl_entries = 0; /* no payload */
 1009 
 1010         pt_req->cmd_pkt = (TW_VOID *)(&(user_buf->cmd_pkt));
 1011         pt_req->cmd_pkt_length = sizeof(struct tw_cl_command_packet);
 1012 
 1013         if ((error = tw_osli_map_request(req)))
 1014                 goto fw_passthru_err;
 1015 
 1016         end_time = tw_osl_get_local_time() + timeout;
 1017         while (req->state != TW_OSLI_REQ_STATE_COMPLETE) {
 1018                 req->flags |= TW_OSLI_REQ_FLAGS_SLEEPING;
 1019                 
 1020                 error = tsleep(req, PRIBIO, "twa_passthru", timeout * hz);
 1021 
 1022                 if (!(req->flags & TW_OSLI_REQ_FLAGS_SLEEPING))
 1023                         error = 0;
 1024                 req->flags &= ~TW_OSLI_REQ_FLAGS_SLEEPING;
 1025 
 1026                 if (! error) {
 1027                         if (((error = req->error_code)) ||
 1028                                 ((error = (req->state !=
 1029                                 TW_OSLI_REQ_STATE_COMPLETE))) ||
 1030                                 ((error = req_pkt->status)))
 1031                                 goto fw_passthru_err;
 1032                         break;
 1033                 }
 1034 
 1035                 if (req_pkt->status) {
 1036                         error = req_pkt->status;
 1037                         goto fw_passthru_err;
 1038                 }
 1039 
 1040                 if (error == EWOULDBLOCK) {
 1041                         /* Time out! */
 1042                         tw_osli_printf(sc, "request = %p",
 1043                                 TW_CL_SEVERITY_ERROR_STRING,
 1044                                 TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1045                                 0x2018,
 1046                                 "Passthru request timed out!",
 1047                                 req);
 1048                         /*
 1049                          * Should I check here if the timeout happened
 1050                          * because of yet another reset, and not do a
 1051                          * second reset?
 1052                          */
 1053                         tw_cl_reset_ctlr(&sc->ctlr_handle);
 1054                         /*
 1055                          * Don't touch req after a reset.  It (and any
 1056                          * associated data) will already have been
 1057                          * unmapped by the callback.
 1058                          */
 1059                         user_buf->driver_pkt.os_status = error;
 1060                         error = ETIMEDOUT;
 1061                         goto fw_passthru_err;
 1062                 }
 1063                 /* 
 1064                  * Either the request got completed, or we were woken up by a
 1065                  * signal.  Calculate the new timeout, in case it was the latter.
 1066                  */
 1067                 timeout = (end_time - tw_osl_get_local_time());
 1068         }
 1069 
 1070         /* If there was a payload, copy it back. */
 1071         if ((!error) && (req->length))
 1072                 if ((error = copyout(req->data, user_buf->pdata,
 1073                         user_buf->driver_pkt.buffer_length)))
 1074                         tw_osli_printf(sc, "error = %d",
 1075                                 TW_CL_SEVERITY_ERROR_STRING,
 1076                                 TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1077                                 0x2019,
 1078                                 "Could not copyout fw_passthru data_buf",
 1079                                 error);
 1080         
 1081 fw_passthru_err:
 1082         /*
 1083          * Print the failure message.  For some reason, on certain OS versions,
 1084          * printing this error message during reset hangs the display (although
 1085          * the rest of the system is running fine.  So, don't print it if the
 1086          * failure was due to a reset.
 1087          */
 1088         if ((error) && (error != TW_CL_ERR_REQ_BUS_RESET))
 1089                 tw_osli_printf(sc, "error = %d",                
 1090                         TW_CL_SEVERITY_ERROR_STRING,
 1091                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1092                         0x201A,
 1093                         "Firmware passthru failed!",
 1094                         error);
 1095 
 1096         user_buf->driver_pkt.os_status = error;
 1097         /* Free resources. */
 1098         if (req->data)
 1099                 free(req->data, TW_OSLI_MALLOC_CLASS);
 1100         tw_osli_req_q_insert_tail(req, TW_OSLI_FREE_Q);
 1101         return(error);
 1102 }
 1103 
 1104 
 1105 
 1106 /*
 1107  * Function name:       tw_osl_complete_passthru
 1108  * Description:         Called to complete passthru requests.
 1109  *
 1110  * Input:               req_handle      -- ptr to request handle
 1111  * Output:              None
 1112  * Return value:        None
 1113  */
 1114 TW_VOID
 1115 tw_osl_complete_passthru(struct tw_cl_req_handle *req_handle)
 1116 {
 1117         struct tw_osli_req_context      *req = req_handle->osl_req_ctxt;
 1118         struct twa_softc                *sc = req->ctlr;
 1119 
 1120         tw_osli_dbg_dprintf(5, sc, "entered");
 1121 
 1122         if (req->state != TW_OSLI_REQ_STATE_BUSY) {
 1123                 tw_osli_printf(sc, "request = %p, status = %d",
 1124                         TW_CL_SEVERITY_ERROR_STRING,
 1125                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1126                         0x201B,
 1127                         "Unposted command completed!!",
 1128                         req, req->state);
 1129         }
 1130 
 1131         /*
 1132          * Remove request from the busy queue.  Just mark it complete.
 1133          * There's no need to move it into the complete queue as we are
 1134          * going to be done with it right now.
 1135          */
 1136         req->state = TW_OSLI_REQ_STATE_COMPLETE;
 1137         tw_osli_req_q_remove_item(req, TW_OSLI_BUSY_Q);
 1138 
 1139         tw_osli_unmap_request(req);
 1140 
 1141         /*
 1142          * Don't do a wake up if there was an error even before the request
 1143          * was sent down to the Common Layer, and we hadn't gotten an
 1144          * EINPROGRESS.  The request originator will then be returned an
 1145          * error, and he can do the clean-up.
 1146          */
 1147         if ((req->error_code) &&
 1148                 (!(req->state & TW_OSLI_REQ_FLAGS_IN_PROGRESS)))
 1149                 return;
 1150 
 1151         if (req->flags & TW_OSLI_REQ_FLAGS_PASSTHRU) {
 1152                 if (req->flags & TW_OSLI_REQ_FLAGS_SLEEPING) {
 1153                         /* Wake up the sleeping command originator. */
 1154                         tw_osli_dbg_dprintf(5, sc,
 1155                                 "Waking up originator of request %p", req);
 1156                         req->flags &= ~TW_OSLI_REQ_FLAGS_SLEEPING;
 1157                         wakeup_one(req);
 1158                 } else {
 1159                         /*
 1160                          * If the request completed even before tsleep
 1161                          * was called, simply return.
 1162                          */
 1163                         if (req->flags & TW_OSLI_REQ_FLAGS_MAPPED)
 1164                                 return;
 1165 
 1166                         tw_osli_printf(sc, "request = %p",
 1167                                 TW_CL_SEVERITY_ERROR_STRING,
 1168                                 TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1169                                 0x201C,
 1170                                 "Passthru callback called, "
 1171                                 "and caller not sleeping",
 1172                                 req);
 1173                 }
 1174         } else {
 1175                 tw_osli_printf(sc, "request = %p",
 1176                         TW_CL_SEVERITY_ERROR_STRING,
 1177                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1178                         0x201D,
 1179                         "Passthru callback called for non-passthru request",
 1180                         req);
 1181         }
 1182 }
 1183 
 1184 
 1185 
 1186 /*
 1187  * Function name:       tw_osli_get_request
 1188  * Description:         Gets a request pkt from the free queue.
 1189  *
 1190  * Input:               sc      -- ptr to OSL internal ctlr context
 1191  * Output:              None
 1192  * Return value:        ptr to request pkt      -- success
 1193  *                      NULL                    -- failure
 1194  */
 1195 struct tw_osli_req_context *
 1196 tw_osli_get_request(struct twa_softc *sc)
 1197 {
 1198         struct tw_osli_req_context      *req;
 1199 
 1200         tw_osli_dbg_dprintf(4, sc, "entered");
 1201 
 1202         /* Get a free request packet. */
 1203         req = tw_osli_req_q_remove_head(sc, TW_OSLI_FREE_Q);
 1204 
 1205         /* Initialize some fields to their defaults. */
 1206         if (req) {
 1207                 req->req_handle.osl_req_ctxt = NULL;
 1208                 req->req_handle.cl_req_ctxt = NULL;
 1209                 req->data = NULL;
 1210                 req->length = 0;
 1211                 req->real_data = NULL;
 1212                 req->real_length = 0;
 1213                 req->state = TW_OSLI_REQ_STATE_INIT;/* req being initialized */
 1214                 req->flags = 0;
 1215                 req->error_code = 0;
 1216                 req->orig_req = NULL;
 1217 
 1218                 bzero(&(req->req_pkt), sizeof(struct tw_cl_req_packet));
 1219 
 1220         }
 1221         return(req);
 1222 }
 1223 
 1224 
 1225 
 1226 /*
 1227  * Function name:       twa_map_load_data_callback
 1228  * Description:         Callback of bus_dmamap_load for the buffer associated
 1229  *                      with data.  Updates the cmd pkt (size/sgl_entries
 1230  *                      fields, as applicable) to reflect the number of sg
 1231  *                      elements.
 1232  *
 1233  * Input:               arg     -- ptr to OSL internal request context
 1234  *                      segs    -- ptr to a list of segment descriptors
 1235  *                      nsegments--# of segments
 1236  *                      error   -- 0 if no errors encountered before callback,
 1237  *                                 non-zero if errors were encountered
 1238  * Output:              None
 1239  * Return value:        None
 1240  */
 1241 static TW_VOID
 1242 twa_map_load_data_callback(TW_VOID *arg, bus_dma_segment_t *segs,
 1243         TW_INT32 nsegments, TW_INT32 error)
 1244 {
 1245         struct tw_osli_req_context      *req =
 1246                 (struct tw_osli_req_context *)arg;
 1247         struct twa_softc                *sc = req->ctlr;
 1248         struct tw_cl_req_packet         *req_pkt = &(req->req_pkt);
 1249 
 1250         tw_osli_dbg_dprintf(10, sc, "entered");
 1251 
 1252         /* Mark the request as currently being processed. */
 1253         req->state = TW_OSLI_REQ_STATE_BUSY;
 1254         /* Move the request into the busy queue. */
 1255         tw_osli_req_q_insert_tail(req, TW_OSLI_BUSY_Q);
 1256 
 1257         req->flags |= TW_OSLI_REQ_FLAGS_MAPPED;
 1258         if (req->flags & TW_OSLI_REQ_FLAGS_IN_PROGRESS)
 1259                 tw_osli_allow_new_requests(sc, (TW_VOID *)(req->orig_req));
 1260 
 1261         if (error == EFBIG) {
 1262                 req->error_code = error;
 1263                 goto out;
 1264         }
 1265 
 1266         if (req->flags & TW_OSLI_REQ_FLAGS_PASSTHRU) {
 1267                 struct tw_cl_passthru_req_packet        *pt_req;
 1268 
 1269                 if (req->flags & TW_OSLI_REQ_FLAGS_DATA_IN)
 1270                         bus_dmamap_sync(sc->ioctl_tag, sc->ioctl_map,
 1271                                 BUS_DMASYNC_PREREAD);
 1272 
 1273                 if (req->flags & TW_OSLI_REQ_FLAGS_DATA_OUT) {
 1274                         /* 
 1275                          * If we're using an alignment buffer, and we're
 1276                          * writing data, copy the real data out.
 1277                          */
 1278                         if (req->flags & TW_OSLI_REQ_FLAGS_DATA_COPY_NEEDED)
 1279                                 bcopy(req->real_data, req->data, req->real_length);
 1280                         bus_dmamap_sync(sc->ioctl_tag, sc->ioctl_map,
 1281                                 BUS_DMASYNC_PREWRITE);
 1282                 }
 1283 
 1284                 pt_req = &(req_pkt->gen_req_pkt.pt_req);
 1285                 pt_req->sg_list = (TW_UINT8 *)segs;
 1286                 pt_req->sgl_entries += (nsegments - 1);
 1287                 error = tw_cl_fw_passthru(&(sc->ctlr_handle), req_pkt,
 1288                         &(req->req_handle));
 1289         } else {
 1290                 struct tw_cl_scsi_req_packet    *scsi_req;
 1291 
 1292                 if (req->flags & TW_OSLI_REQ_FLAGS_DATA_IN)
 1293                         bus_dmamap_sync(sc->dma_tag, req->dma_map,
 1294                                 BUS_DMASYNC_PREREAD);
 1295 
 1296                 if (req->flags & TW_OSLI_REQ_FLAGS_DATA_OUT) {
 1297                         /* 
 1298                          * If we're using an alignment buffer, and we're
 1299                          * writing data, copy the real data out.
 1300                          */
 1301                         if (req->flags & TW_OSLI_REQ_FLAGS_DATA_COPY_NEEDED)
 1302                                 bcopy(req->real_data, req->data, req->real_length);
 1303                         bus_dmamap_sync(sc->dma_tag, req->dma_map,
 1304                                 BUS_DMASYNC_PREWRITE);
 1305                 }
 1306 
 1307                 scsi_req = &(req_pkt->gen_req_pkt.scsi_req);
 1308                 scsi_req->sg_list = (TW_UINT8 *)segs;
 1309                 scsi_req->sgl_entries += (nsegments - 1);
 1310                 error = tw_cl_start_io(&(sc->ctlr_handle), req_pkt,
 1311                         &(req->req_handle));
 1312         }
 1313 
 1314 out:
 1315         if (error) {
 1316                 req->error_code = error;
 1317                 req_pkt->tw_osl_callback(&(req->req_handle));
 1318                 /*
 1319                  * If the caller had been returned EINPROGRESS, and he has
 1320                  * registered a callback for handling completion, the callback
 1321                  * will never get called because we were unable to submit the
 1322                  * request.  So, free up the request right here.
 1323                  */
 1324                 if (req->flags & TW_OSLI_REQ_FLAGS_IN_PROGRESS)
 1325                         tw_osli_req_q_insert_tail(req, TW_OSLI_FREE_Q);
 1326         }
 1327 }
 1328 
 1329 
 1330 
 1331 /*
 1332  * Function name:       twa_map_load_callback
 1333  * Description:         Callback of bus_dmamap_load for the buffer associated
 1334  *                      with a cmd pkt.
 1335  *
 1336  * Input:               arg     -- ptr to variable to hold phys addr
 1337  *                      segs    -- ptr to a list of segment descriptors
 1338  *                      nsegments--# of segments
 1339  *                      error   -- 0 if no errors encountered before callback,
 1340  *                                 non-zero if errors were encountered
 1341  * Output:              None
 1342  * Return value:        None
 1343  */
 1344 static TW_VOID
 1345 twa_map_load_callback(TW_VOID *arg, bus_dma_segment_t *segs,
 1346         TW_INT32 nsegments, TW_INT32 error)
 1347 {
 1348         *((TW_UINT64 *)arg) = segs[0].ds_addr;
 1349 }
 1350 
 1351 
 1352 
 1353 /*
 1354  * Function name:       tw_osli_map_request
 1355  * Description:         Maps a cmd pkt and data associated with it, into
 1356  *                      DMA'able memory.
 1357  *
 1358  * Input:               req     -- ptr to request pkt
 1359  * Output:              None
 1360  * Return value:        0       -- success
 1361  *                      non-zero-- failure
 1362  */
 1363 TW_INT32
 1364 tw_osli_map_request(struct tw_osli_req_context *req)
 1365 {
 1366         struct twa_softc        *sc = req->ctlr;
 1367         TW_INT32                error = 0;
 1368 
 1369         tw_osli_dbg_dprintf(10, sc, "entered");
 1370 
 1371         /* If the command involves data, map that too. */
 1372         if (req->data != NULL) {
 1373                 /*
 1374                  * It's sufficient for the data pointer to be 4-byte aligned
 1375                  * to work with 9000.  However, if 4-byte aligned addresses
 1376                  * are passed to bus_dmamap_load, we can get back sg elements
 1377                  * that are not 512-byte multiples in size.  So, we will let
 1378                  * only those buffers that are 512-byte aligned to pass
 1379                  * through, and bounce the rest, so as to make sure that we
 1380                  * always get back sg elements that are 512-byte multiples
 1381                  * in size.
 1382                  */
 1383                 if (((vm_offset_t)req->data % sc->sg_size_factor) ||
 1384                         (req->length % sc->sg_size_factor)) {
 1385                         req->flags |= TW_OSLI_REQ_FLAGS_DATA_COPY_NEEDED;
 1386                         /* Save original data pointer and length. */
 1387                         req->real_data = req->data;
 1388                         req->real_length = req->length;
 1389                         req->length = (req->length +
 1390                                 (sc->sg_size_factor - 1)) &
 1391                                 ~(sc->sg_size_factor - 1);
 1392                         req->data = malloc(req->length, TW_OSLI_MALLOC_CLASS,
 1393                                         M_NOWAIT);
 1394                         if (req->data == NULL) {
 1395                                 tw_osli_printf(sc, "error = %d",
 1396                                         TW_CL_SEVERITY_ERROR_STRING,
 1397                                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1398                                         0x201E,
 1399                                         "Failed to allocate memory "
 1400                                         "for bounce buffer",
 1401                                         ENOMEM);
 1402                                 /* Restore original data pointer and length. */
 1403                                 req->data = req->real_data;
 1404                                 req->length = req->real_length;
 1405                                 return(ENOMEM);
 1406                         }
 1407                 }
 1408         
 1409                 /*
 1410                  * Map the data buffer into bus space and build the SG list.
 1411                  */
 1412                 if (req->flags & TW_OSLI_REQ_FLAGS_PASSTHRU) {
 1413                         /* Lock against multiple simultaneous ioctl calls. */
 1414                         mtx_lock_spin(sc->io_lock);
 1415                         error = bus_dmamap_load(sc->ioctl_tag, sc->ioctl_map,
 1416                                 req->data, req->length,
 1417                                 twa_map_load_data_callback, req,
 1418                                 BUS_DMA_WAITOK);
 1419                         mtx_unlock_spin(sc->io_lock);
 1420                 } else {
 1421                         /*
 1422                          * There's only one CAM I/O thread running at a time.
 1423                          * So, there's no need to hold the io_lock.
 1424                          */
 1425                         error = bus_dmamap_load(sc->dma_tag, req->dma_map,
 1426                                 req->data, req->length,
 1427                                 twa_map_load_data_callback, req,
 1428                                 BUS_DMA_WAITOK);
 1429                 }
 1430                 
 1431                 if (!error)
 1432                         error = req->error_code;
 1433                 else {
 1434                         if (error == EINPROGRESS) {
 1435                                 /*
 1436                                  * Specifying sc->io_lock as the lockfuncarg
 1437                                  * in ...tag_create should protect the access
 1438                                  * of ...FLAGS_MAPPED from the callback.
 1439                                  */
 1440                                 mtx_lock_spin(sc->io_lock);
 1441                                 if (!(req->flags & TW_OSLI_REQ_FLAGS_MAPPED)) {
 1442                                         req->flags |=
 1443                                                 TW_OSLI_REQ_FLAGS_IN_PROGRESS;
 1444                                         tw_osli_disallow_new_requests(sc);
 1445                                 }
 1446                                 mtx_unlock_spin(sc->io_lock);
 1447                                 error = 0;
 1448                         } else {
 1449                                 /* Free alignment buffer if it was used. */
 1450                                 if (req->flags &
 1451                                         TW_OSLI_REQ_FLAGS_DATA_COPY_NEEDED) {
 1452                                         free(req->data, TW_OSLI_MALLOC_CLASS);
 1453                                         /*
 1454                                          * Restore original data pointer
 1455                                          * and length.
 1456                                          */
 1457                                         req->data = req->real_data;
 1458                                         req->length = req->real_length;
 1459                                 }
 1460                         }
 1461                 }
 1462 
 1463         } else {
 1464                 /* Mark the request as currently being processed. */
 1465                 req->state = TW_OSLI_REQ_STATE_BUSY;
 1466                 /* Move the request into the busy queue. */
 1467                 tw_osli_req_q_insert_tail(req, TW_OSLI_BUSY_Q);
 1468                 if (req->flags & TW_OSLI_REQ_FLAGS_PASSTHRU)
 1469                         error = tw_cl_fw_passthru(&sc->ctlr_handle,
 1470                                         &(req->req_pkt), &(req->req_handle));
 1471                 else
 1472                         error = tw_cl_start_io(&sc->ctlr_handle,
 1473                                         &(req->req_pkt), &(req->req_handle));
 1474                 if (error) {
 1475                         req->error_code = error;
 1476                         req->req_pkt.tw_osl_callback(&(req->req_handle));
 1477                 }
 1478         }
 1479         return(error);
 1480 }
 1481 
 1482 
 1483 
 1484 /*
 1485  * Function name:       tw_osli_unmap_request
 1486  * Description:         Undoes the mapping done by tw_osli_map_request.
 1487  *
 1488  * Input:               req     -- ptr to request pkt
 1489  * Output:              None
 1490  * Return value:        None
 1491  */
 1492 TW_VOID
 1493 tw_osli_unmap_request(struct tw_osli_req_context *req)
 1494 {
 1495         struct twa_softc        *sc = req->ctlr;
 1496 
 1497         tw_osli_dbg_dprintf(10, sc, "entered");
 1498 
 1499         /* If the command involved data, unmap that too. */
 1500         if (req->data != NULL) {
 1501                 if (req->flags & TW_OSLI_REQ_FLAGS_PASSTHRU) {
 1502                         /* Lock against multiple simultaneous ioctl calls. */
 1503                         mtx_lock_spin(sc->io_lock);
 1504 
 1505                         if (req->flags & TW_OSLI_REQ_FLAGS_DATA_IN) {
 1506                                 bus_dmamap_sync(sc->ioctl_tag,
 1507                                         sc->ioctl_map, BUS_DMASYNC_POSTREAD);
 1508 
 1509                                 /* 
 1510                                  * If we are using a bounce buffer, and we are
 1511                                  * reading data, copy the real data in.
 1512                                  */
 1513                                 if (req->flags & TW_OSLI_REQ_FLAGS_DATA_COPY_NEEDED)
 1514                                         bcopy(req->data, req->real_data,
 1515                                                 req->real_length);
 1516                         }
 1517 
 1518                         if (req->flags & TW_OSLI_REQ_FLAGS_DATA_OUT)
 1519                                 bus_dmamap_sync(sc->ioctl_tag, sc->ioctl_map,
 1520                                         BUS_DMASYNC_POSTWRITE);
 1521 
 1522                         bus_dmamap_unload(sc->ioctl_tag, sc->ioctl_map);
 1523 
 1524                         mtx_unlock_spin(sc->io_lock);
 1525                 } else {
 1526                         if (req->flags & TW_OSLI_REQ_FLAGS_DATA_IN) {
 1527                                 bus_dmamap_sync(sc->dma_tag,
 1528                                         req->dma_map, BUS_DMASYNC_POSTREAD);
 1529 
 1530                                 /* 
 1531                                  * If we are using a bounce buffer, and we are
 1532                                  * reading data, copy the real data in.
 1533                                  */
 1534                                 if (req->flags & TW_OSLI_REQ_FLAGS_DATA_COPY_NEEDED)
 1535                                         bcopy(req->data, req->real_data,
 1536                                                 req->real_length);
 1537                         }
 1538                         if (req->flags & TW_OSLI_REQ_FLAGS_DATA_OUT)
 1539                                 bus_dmamap_sync(sc->dma_tag, req->dma_map,
 1540                                         BUS_DMASYNC_POSTWRITE);
 1541 
 1542                         bus_dmamap_unload(sc->dma_tag, req->dma_map);
 1543                 }
 1544         }
 1545 
 1546         /* Free alignment buffer if it was used. */
 1547         if (req->flags & TW_OSLI_REQ_FLAGS_DATA_COPY_NEEDED) {
 1548                 free(req->data, TW_OSLI_MALLOC_CLASS);
 1549                 /* Restore original data pointer and length. */
 1550                 req->data = req->real_data;
 1551                 req->length = req->real_length;
 1552         }
 1553 }
 1554 
 1555 
 1556 
 1557 #ifdef TW_OSL_DEBUG
 1558 
 1559 TW_VOID twa_report_stats(TW_VOID);
 1560 TW_VOID twa_reset_stats(TW_VOID);
 1561 TW_VOID tw_osli_print_ctlr_stats(struct twa_softc *sc);
 1562 TW_VOID twa_print_req_info(struct tw_osli_req_context *req);
 1563 
 1564 
 1565 /*
 1566  * Function name:       twa_report_stats
 1567  * Description:         For being called from ddb.  Calls functions that print
 1568  *                      OSL and CL internal stats for the controller.
 1569  *
 1570  * Input:               None
 1571  * Output:              None
 1572  * Return value:        None
 1573  */
 1574 TW_VOID
 1575 twa_report_stats(TW_VOID)
 1576 {
 1577         struct twa_softc        *sc;
 1578         TW_INT32                i;
 1579 
 1580         for (i = 0; (sc = devclass_get_softc(twa_devclass, i)) != NULL; i++) {
 1581                 tw_osli_print_ctlr_stats(sc);
 1582                 tw_cl_print_ctlr_stats(&sc->ctlr_handle);
 1583         }
 1584 }
 1585 
 1586 
 1587 
 1588 /*
 1589  * Function name:       tw_osli_print_ctlr_stats
 1590  * Description:         For being called from ddb.  Prints OSL controller stats
 1591  *
 1592  * Input:               sc      -- ptr to OSL internal controller context
 1593  * Output:              None
 1594  * Return value:        None
 1595  */
 1596 TW_VOID
 1597 tw_osli_print_ctlr_stats(struct twa_softc *sc)
 1598 {
 1599         twa_printf(sc, "osl_ctlr_ctxt = %p\n", sc);
 1600         twa_printf(sc, "OSLq type  current  max\n");
 1601         twa_printf(sc, "free      %04d     %04d\n",
 1602                 sc->q_stats[TW_OSLI_FREE_Q].cur_len,
 1603                 sc->q_stats[TW_OSLI_FREE_Q].max_len);
 1604         twa_printf(sc, "busy      %04d     %04d\n",
 1605                 sc->q_stats[TW_OSLI_BUSY_Q].cur_len,
 1606                 sc->q_stats[TW_OSLI_BUSY_Q].max_len);
 1607 }       
 1608 
 1609 
 1610 
 1611 /*
 1612  * Function name:       twa_print_req_info
 1613  * Description:         For being called from ddb.  Calls functions that print
 1614  *                      OSL and CL internal details for the request.
 1615  *
 1616  * Input:               req     -- ptr to OSL internal request context
 1617  * Output:              None
 1618  * Return value:        None
 1619  */
 1620 TW_VOID
 1621 twa_print_req_info(struct tw_osli_req_context *req)
 1622 {
 1623         struct twa_softc        *sc = req->ctlr;
 1624 
 1625         twa_printf(sc, "OSL details for request:\n");
 1626         twa_printf(sc, "osl_req_ctxt = %p, cl_req_ctxt = %p\n"
 1627                 "data = %p, length = 0x%x, real_data = %p, real_length = 0x%x\n"
 1628                 "state = 0x%x, flags = 0x%x, error = 0x%x, orig_req = %p\n"
 1629                 "next_req = %p, prev_req = %p, dma_map = %p\n",
 1630                 req->req_handle.osl_req_ctxt, req->req_handle.cl_req_ctxt,
 1631                 req->data, req->length, req->real_data, req->real_length,
 1632                 req->state, req->flags, req->error_code, req->orig_req,
 1633                 req->link.next, req->link.prev, req->dma_map);
 1634         tw_cl_print_req_info(&(req->req_handle));
 1635 }
 1636 
 1637 
 1638 
 1639 /*
 1640  * Function name:       twa_reset_stats
 1641  * Description:         For being called from ddb.
 1642  *                      Resets some OSL controller stats.
 1643  *
 1644  * Input:               None
 1645  * Output:              None
 1646  * Return value:        None
 1647  */
 1648 TW_VOID
 1649 twa_reset_stats(TW_VOID)
 1650 {
 1651         struct twa_softc        *sc;
 1652         TW_INT32                i;
 1653 
 1654         for (i = 0; (sc = devclass_get_softc(twa_devclass, i)) != NULL; i++) {
 1655                 sc->q_stats[TW_OSLI_FREE_Q].max_len = 0;
 1656                 sc->q_stats[TW_OSLI_BUSY_Q].max_len = 0;
 1657                 tw_cl_reset_stats(&sc->ctlr_handle);
 1658         }
 1659 }
 1660 
 1661 #endif /* TW_OSL_DEBUG */

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