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/7.3/sys/dev/twa/tw_osl_freebsd.c 190568 2009-03-30 18:43:41Z jhb $
   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, d_thread_t *proc)
   90 {
   91         TW_INT32                unit = minor(dev);
   92         struct twa_softc        *sc = devclass_get_softc(twa_devclass, unit);
   93 
   94         tw_osli_dbg_dprintf(5, sc, "entered");
   95         sc->state |= TW_OSLI_CTLR_STATE_OPEN;
   96         return(0);
   97 }
   98 
   99 
  100 
  101 /*
  102  * Function name:       twa_close
  103  * Description:         Called when the controller is closed.
  104  *                      Simply marks the controller as not open.
  105  *
  106  * Input:               dev     -- control device corresponding to the ctlr
  107  *                      flags   -- mode of corresponding open
  108  *                      fmt     -- device type (character/block etc.)
  109  *                      proc    -- current process
  110  * Output:              None
  111  * Return value:        0       -- success
  112  *                      non-zero-- failure
  113  */
  114 static TW_INT32
  115 twa_close(struct cdev *dev, TW_INT32 flags, TW_INT32 fmt, d_thread_t *proc)
  116 {
  117         TW_INT32                unit = minor(dev);
  118         struct twa_softc        *sc = devclass_get_softc(twa_devclass, unit);
  119 
  120         tw_osli_dbg_dprintf(5, sc, "entered");
  121         sc->state &= ~TW_OSLI_CTLR_STATE_OPEN;
  122         return(0);
  123 }
  124 
  125 
  126 
  127 /*
  128  * Function name:       twa_ioctl
  129  * Description:         Called when an ioctl is posted to the controller.
  130  *                      Handles any OS Layer specific cmds, passes the rest
  131  *                      on to the Common Layer.
  132  *
  133  * Input:               dev     -- control device corresponding to the ctlr
  134  *                      cmd     -- ioctl cmd
  135  *                      buf     -- ptr to buffer in kernel memory, which is
  136  *                                 a copy of the input buffer in user-space
  137  *                      flags   -- mode of corresponding open
  138  *                      proc    -- current process
  139  * Output:              buf     -- ptr to buffer in kernel memory, which will
  140  *                                 be copied to the output buffer in user-space
  141  * Return value:        0       -- success
  142  *                      non-zero-- failure
  143  */
  144 static TW_INT32
  145 twa_ioctl(struct cdev *dev, u_long cmd, caddr_t buf, TW_INT32 flags, d_thread_t *proc)
  146 {
  147         struct twa_softc        *sc = (struct twa_softc *)(dev->si_drv1);
  148         TW_INT32                error;
  149 
  150         tw_osli_dbg_dprintf(5, sc, "entered");
  151 
  152         switch (cmd) {
  153         case TW_OSL_IOCTL_FIRMWARE_PASS_THROUGH:
  154                 tw_osli_dbg_dprintf(6, sc, "ioctl: fw_passthru");
  155                 error = tw_osli_fw_passthru(sc, (TW_INT8 *)buf);
  156                 break;
  157 
  158         case TW_OSL_IOCTL_SCAN_BUS:
  159                 /* Request CAM for a bus scan. */
  160                 tw_osli_dbg_dprintf(6, sc, "ioctl: scan bus");
  161                 error = tw_osli_request_bus_scan(sc);
  162                 break;
  163 
  164         default:
  165                 tw_osli_dbg_dprintf(6, sc, "ioctl: 0x%lx", cmd);
  166                 error = tw_cl_ioctl(&sc->ctlr_handle, cmd, buf);
  167                 break;
  168         }
  169         return(error);
  170 }
  171 
  172 
  173 
  174 static TW_INT32 twa_probe(device_t dev);
  175 static TW_INT32 twa_attach(device_t dev);
  176 static TW_INT32 twa_detach(device_t dev);
  177 static TW_INT32 twa_shutdown(device_t dev);
  178 static TW_VOID  twa_busdma_lock(TW_VOID *lock_arg, bus_dma_lock_op_t op);
  179 #ifdef TW_OSLI_DEFERRED_INTR_USED
  180 static int      twa_pci_intr_fast(TW_VOID *arg);
  181 static TW_VOID  twa_deferred_intr(TW_VOID *context, TW_INT32 pending);
  182 #else
  183 static TW_VOID  twa_pci_intr(TW_VOID *arg);
  184 #endif /* TW_OSLI_DEFERRED_INTR_USED */
  185 
  186 static TW_INT32 tw_osli_alloc_mem(struct twa_softc *sc);
  187 static TW_VOID  tw_osli_free_resources(struct twa_softc *sc);
  188 
  189 static TW_VOID  twa_map_load_data_callback(TW_VOID *arg,
  190         bus_dma_segment_t *segs, TW_INT32 nsegments, TW_INT32 error);
  191 static TW_VOID  twa_map_load_callback(TW_VOID *arg,
  192         bus_dma_segment_t *segs, TW_INT32 nsegments, TW_INT32 error);
  193 
  194 
  195 static device_method_t  twa_methods[] = {
  196         /* Device interface */
  197         DEVMETHOD(device_probe,         twa_probe),
  198         DEVMETHOD(device_attach,        twa_attach),
  199         DEVMETHOD(device_detach,        twa_detach),
  200         DEVMETHOD(device_shutdown,      twa_shutdown),
  201 
  202         DEVMETHOD(bus_print_child,      bus_generic_print_child),
  203         DEVMETHOD(bus_driver_added,     bus_generic_driver_added),
  204         {0, 0}
  205 };
  206 
  207 static driver_t twa_pci_driver = {
  208         "twa",
  209         twa_methods,
  210         sizeof(struct twa_softc)
  211 };
  212 
  213 DRIVER_MODULE(twa, pci, twa_pci_driver, twa_devclass, 0, 0);
  214 MODULE_DEPEND(twa, cam, 1, 1, 1);
  215 MODULE_DEPEND(twa, pci, 1, 1, 1);
  216 
  217 
  218 /*
  219  * Function name:       twa_probe
  220  * Description:         Called at driver load time.  Claims 9000 ctlrs.
  221  *
  222  * Input:               dev     -- bus device corresponding to the ctlr
  223  * Output:              None
  224  * Return value:        <= 0    -- success
  225  *                      > 0     -- failure
  226  */
  227 static TW_INT32
  228 twa_probe(device_t dev)
  229 {
  230         static TW_UINT8 first_ctlr = 1;
  231 
  232         tw_osli_dbg_printf(3, "entered");
  233 
  234         if (tw_cl_ctlr_supported(pci_get_vendor(dev), pci_get_device(dev))) {
  235                 device_set_desc(dev, TW_OSLI_DEVICE_NAME);
  236                 /* Print the driver version only once. */
  237                 if (first_ctlr) {
  238                         printf("3ware device driver for 9000 series storage "
  239                                 "controllers, version: %s\n",
  240                                 TW_OSL_DRIVER_VERSION_STRING);
  241                         first_ctlr = 0;
  242                 }
  243                 return(0);
  244         }
  245         return(ENXIO);
  246 }
  247 
  248 
  249 
  250 /*
  251  * Function name:       twa_attach
  252  * Description:         Allocates pci resources; updates sc; adds a node to the
  253  *                      sysctl tree to expose the driver version; makes calls
  254  *                      (to the Common Layer) to initialize ctlr, and to
  255  *                      attach to CAM.
  256  *
  257  * Input:               dev     -- bus device corresponding to the ctlr
  258  * Output:              None
  259  * Return value:        0       -- success
  260  *                      non-zero-- failure
  261  */
  262 static TW_INT32
  263 twa_attach(device_t dev)
  264 {
  265         struct twa_softc        *sc = device_get_softc(dev);
  266         TW_UINT32               command;
  267         TW_INT32                bar_num;
  268         TW_INT32                bar0_offset;
  269         TW_INT32                bar_size;
  270         TW_INT32                error;
  271 
  272         tw_osli_dbg_dprintf(3, sc, "entered");
  273 
  274         sc->ctlr_handle.osl_ctlr_ctxt = sc;
  275 
  276         /* Initialize the softc structure. */
  277         sc->bus_dev = dev;
  278         sc->device_id = pci_get_device(dev);
  279 
  280         /* Initialize the mutexes right here. */
  281         sc->io_lock = &(sc->io_lock_handle);
  282         mtx_init(sc->io_lock, "tw_osl_io_lock", NULL, MTX_SPIN);
  283         sc->q_lock = &(sc->q_lock_handle);
  284         mtx_init(sc->q_lock, "tw_osl_q_lock", NULL, MTX_SPIN);
  285         sc->sim_lock = &(sc->sim_lock_handle);
  286         mtx_init(sc->sim_lock, "tw_osl_sim_lock", NULL, MTX_DEF | MTX_RECURSE);
  287 
  288         sysctl_ctx_init(&sc->sysctl_ctxt);
  289         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctxt,
  290                 SYSCTL_STATIC_CHILDREN(_hw), OID_AUTO,
  291                 device_get_nameunit(dev), CTLFLAG_RD, 0, "");
  292         if (sc->sysctl_tree == NULL) {
  293                 tw_osli_printf(sc, "error = %d",
  294                         TW_CL_SEVERITY_ERROR_STRING,
  295                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  296                         0x2000,
  297                         "Cannot add sysctl tree node",
  298                         ENXIO);
  299                 return(ENXIO);
  300         }
  301         SYSCTL_ADD_STRING(&sc->sysctl_ctxt, SYSCTL_CHILDREN(sc->sysctl_tree),
  302                 OID_AUTO, "driver_version", CTLFLAG_RD,
  303                 TW_OSL_DRIVER_VERSION_STRING, 0, "TWA driver version");
  304 
  305         /* Make sure we are going to be able to talk to this board. */
  306         command = pci_read_config(dev, PCIR_COMMAND, 2);
  307         if ((command & PCIM_CMD_PORTEN) == 0) {
  308                 tw_osli_printf(sc, "error = %d",
  309                         TW_CL_SEVERITY_ERROR_STRING,
  310                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  311                         0x2001,
  312                         "Register window not available",
  313                         ENXIO);
  314                 tw_osli_free_resources(sc);
  315                 return(ENXIO);
  316         }
  317 
  318         /* Force the busmaster enable bit on, in case the BIOS forgot. */
  319         command |= PCIM_CMD_BUSMASTEREN;
  320         pci_write_config(dev, PCIR_COMMAND, command, 2);
  321 
  322         /* Allocate the PCI register window. */
  323         if ((error = tw_cl_get_pci_bar_info(sc->device_id, TW_CL_BAR_TYPE_MEM,
  324                 &bar_num, &bar0_offset, &bar_size))) {
  325                 tw_osli_printf(sc, "error = %d",
  326                         TW_CL_SEVERITY_ERROR_STRING,
  327                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  328                         0x201F,
  329                         "Can't get PCI BAR info",
  330                         error);
  331                 tw_osli_free_resources(sc);
  332                 return(error);
  333         }
  334         sc->reg_res_id = PCIR_BARS + bar0_offset;
  335         if ((sc->reg_res = bus_alloc_resource(dev, SYS_RES_MEMORY,
  336                                 &(sc->reg_res_id), 0, ~0, 1, RF_ACTIVE))
  337                                 == NULL) {
  338                 tw_osli_printf(sc, "error = %d",
  339                         TW_CL_SEVERITY_ERROR_STRING,
  340                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  341                         0x2002,
  342                         "Can't allocate register window",
  343                         ENXIO);
  344                 tw_osli_free_resources(sc);
  345                 return(ENXIO);
  346         }
  347         sc->bus_tag = rman_get_bustag(sc->reg_res);
  348         sc->bus_handle = rman_get_bushandle(sc->reg_res);
  349 
  350         /* Allocate and register our interrupt. */
  351         sc->irq_res_id = 0;
  352         if ((sc->irq_res = bus_alloc_resource(sc->bus_dev, SYS_RES_IRQ,
  353                                 &(sc->irq_res_id), 0, ~0, 1,
  354                                 RF_SHAREABLE | RF_ACTIVE)) == NULL) {
  355                 tw_osli_printf(sc, "error = %d",
  356                         TW_CL_SEVERITY_ERROR_STRING,
  357                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  358                         0x2003,
  359                         "Can't allocate interrupt",
  360                         ENXIO);
  361                 tw_osli_free_resources(sc);
  362                 return(ENXIO);
  363         }
  364         if ((error = bus_setup_intr(sc->bus_dev, sc->irq_res,
  365 #ifdef TW_OSLI_DEFERRED_INTR_USED
  366                         INTR_TYPE_CAM | INTR_FAST,
  367                         twa_pci_intr_fast, NULL,
  368 #else
  369                         INTR_TYPE_CAM | INTR_MPSAFE,
  370                         NULL, twa_pci_intr,         
  371 #endif 
  372                         sc, &sc->intr_handle))) {
  373                 tw_osli_printf(sc, "error = %d",
  374                         TW_CL_SEVERITY_ERROR_STRING,
  375                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  376                         0x2004,
  377                         "Can't set up interrupt",
  378                         error);
  379                 tw_osli_free_resources(sc);
  380                 return(error);
  381         }
  382 
  383 #ifdef TW_OSLI_DEFERRED_INTR_USED
  384         TASK_INIT(&sc->deferred_intr_callback, 0, twa_deferred_intr, sc);
  385 #endif /* TW_OSLI_DEFERRED_INTR_USED */
  386 
  387         if ((error = tw_osli_alloc_mem(sc))) {
  388                 tw_osli_printf(sc, "error = %d",
  389                         TW_CL_SEVERITY_ERROR_STRING,
  390                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  391                         0x2005,
  392                         "Memory allocation failure",
  393                         error);
  394                 tw_osli_free_resources(sc);
  395                 return(error);
  396         }
  397 
  398         /* Initialize the Common Layer for this controller. */
  399         if ((error = tw_cl_init_ctlr(&sc->ctlr_handle, sc->flags, sc->device_id,
  400                         TW_OSLI_MAX_NUM_IOS, TW_OSLI_MAX_NUM_AENS,
  401                         sc->non_dma_mem, sc->dma_mem,
  402                         sc->dma_mem_phys
  403                         ))) {
  404                 tw_osli_printf(sc, "error = %d",
  405                         TW_CL_SEVERITY_ERROR_STRING,
  406                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  407                         0x2006,
  408                         "Failed to initialize Common Layer/controller",
  409                         error);
  410                 tw_osli_free_resources(sc);
  411                 return(error);
  412         }
  413 
  414         /* Create the control device. */
  415         sc->ctrl_dev = make_dev(&twa_cdevsw, device_get_unit(sc->bus_dev),
  416                         UID_ROOT, GID_OPERATOR, S_IRUSR | S_IWUSR,
  417                         "twa%d", device_get_unit(sc->bus_dev));
  418         sc->ctrl_dev->si_drv1 = sc;
  419 
  420         if ((error = tw_osli_cam_attach(sc))) {
  421                 tw_osli_free_resources(sc);
  422                 tw_osli_printf(sc, "error = %d",
  423                         TW_CL_SEVERITY_ERROR_STRING,
  424                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  425                         0x2007,
  426                         "Failed to initialize CAM",
  427                         error);
  428                 return(error);
  429         }
  430 
  431         return(0);
  432 }
  433 
  434 
  435 
  436 /*
  437  * Function name:       tw_osli_alloc_mem
  438  * Description:         Allocates memory needed both by CL and OSL.
  439  *
  440  * Input:               sc      -- OSL internal controller context
  441  * Output:              None
  442  * Return value:        0       -- success
  443  *                      non-zero-- failure
  444  */
  445 static TW_INT32
  446 tw_osli_alloc_mem(struct twa_softc *sc)
  447 {
  448         struct tw_osli_req_context      *req;
  449         TW_UINT32                       max_sg_elements;
  450         TW_UINT32                       non_dma_mem_size;
  451         TW_UINT32                       dma_mem_size;
  452         TW_INT32                        error;
  453         TW_INT32                        i;
  454 
  455         tw_osli_dbg_dprintf(3, sc, "entered");
  456 
  457         sc->flags |= (sizeof(bus_addr_t) == 8) ? TW_CL_64BIT_ADDRESSES : 0;
  458         sc->flags |= (sizeof(bus_size_t) == 8) ? TW_CL_64BIT_SG_LENGTH : 0;
  459 #ifdef TW_OSLI_DEFERRED_INTR_USED
  460         sc->flags |= TW_CL_DEFERRED_INTR_USED; 
  461 #endif /* TW_OSLI_DEFERRED_INTR_USED */
  462 
  463         max_sg_elements = (sizeof(bus_addr_t) == 8) ?
  464                 TW_CL_MAX_64BIT_SG_ELEMENTS : TW_CL_MAX_32BIT_SG_ELEMENTS;
  465 
  466         if ((error = tw_cl_get_mem_requirements(&sc->ctlr_handle, sc->flags,
  467                         sc->device_id, TW_OSLI_MAX_NUM_IOS,  TW_OSLI_MAX_NUM_AENS,
  468                         &(sc->alignment), &(sc->sg_size_factor),
  469                         &non_dma_mem_size, &dma_mem_size
  470                         ))) {
  471                 tw_osli_printf(sc, "error = %d",
  472                         TW_CL_SEVERITY_ERROR_STRING,
  473                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  474                         0x2008,
  475                         "Can't get Common Layer's memory requirements",
  476                         error);
  477                 return(error);
  478         }
  479 
  480         if ((sc->non_dma_mem = malloc(non_dma_mem_size, TW_OSLI_MALLOC_CLASS,
  481                                 M_WAITOK)) == NULL) {
  482                 tw_osli_printf(sc, "error = %d",
  483                         TW_CL_SEVERITY_ERROR_STRING,
  484                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  485                         0x2009,
  486                         "Can't allocate non-dma memory",
  487                         ENOMEM);
  488                 return(ENOMEM);
  489         }
  490 
  491         /* Create the parent dma tag. */
  492         if (bus_dma_tag_create(NULL,                    /* parent */
  493                                 sc->alignment,          /* alignment */
  494                                 TW_OSLI_DMA_BOUNDARY,   /* boundary */
  495                                 BUS_SPACE_MAXADDR,      /* lowaddr */
  496                                 BUS_SPACE_MAXADDR,      /* highaddr */
  497                                 NULL, NULL,             /* filter, filterarg */
  498                                 TW_CL_MAX_IO_SIZE,      /* maxsize */
  499                                 max_sg_elements,        /* nsegments */
  500                                 TW_CL_MAX_IO_SIZE,      /* maxsegsize */
  501                                 0,                      /* flags */
  502                                 NULL,                   /* lockfunc */
  503                                 NULL,                   /* lockfuncarg */
  504                                 &sc->parent_tag         /* tag */)) {
  505                 tw_osli_printf(sc, "error = %d",
  506                         TW_CL_SEVERITY_ERROR_STRING,
  507                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  508                         0x200A,
  509                         "Can't allocate parent DMA tag",
  510                         ENOMEM);
  511                 return(ENOMEM);
  512         }
  513 
  514         /* Create a dma tag for Common Layer's DMA'able memory (dma_mem). */
  515         if (bus_dma_tag_create(sc->parent_tag,          /* parent */
  516                                 sc->alignment,          /* alignment */
  517                                 0,                      /* boundary */
  518                                 BUS_SPACE_MAXADDR,      /* lowaddr */
  519                                 BUS_SPACE_MAXADDR,      /* highaddr */
  520                                 NULL, NULL,             /* filter, filterarg */
  521                                 dma_mem_size,           /* maxsize */
  522                                 1,                      /* nsegments */
  523                                 BUS_SPACE_MAXSIZE,      /* maxsegsize */
  524                                 0,                      /* flags */
  525                                 NULL,                   /* lockfunc */
  526                                 NULL,                   /* lockfuncarg */
  527                                 &sc->cmd_tag            /* tag */)) {
  528                 tw_osli_printf(sc, "error = %d",
  529                         TW_CL_SEVERITY_ERROR_STRING,
  530                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  531                         0x200B,
  532                         "Can't allocate DMA tag for Common Layer's "
  533                         "DMA'able memory",
  534                         ENOMEM);
  535                 return(ENOMEM);
  536         }
  537 
  538         if (bus_dmamem_alloc(sc->cmd_tag, &sc->dma_mem,
  539                 BUS_DMA_NOWAIT, &sc->cmd_map)) {
  540                 /* Try a second time. */
  541                 if (bus_dmamem_alloc(sc->cmd_tag, &sc->dma_mem,
  542                         BUS_DMA_NOWAIT, &sc->cmd_map)) {
  543                         tw_osli_printf(sc, "error = %d",
  544                                 TW_CL_SEVERITY_ERROR_STRING,
  545                                 TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  546                                 0x200C,
  547                                 "Can't allocate DMA'able memory for the"
  548                                 "Common Layer",
  549                                 ENOMEM);
  550                         return(ENOMEM);
  551                 }
  552         }
  553 
  554         bus_dmamap_load(sc->cmd_tag, sc->cmd_map, sc->dma_mem,
  555                 dma_mem_size, twa_map_load_callback,
  556                 &sc->dma_mem_phys, 0);
  557 
  558         /*
  559          * Create a dma tag for data buffers; size will be the maximum
  560          * possible I/O size (128kB).
  561          */
  562         if (bus_dma_tag_create(sc->parent_tag,          /* parent */
  563                                 sc->alignment,          /* alignment */
  564                                 0,                      /* boundary */
  565                                 BUS_SPACE_MAXADDR,      /* lowaddr */
  566                                 BUS_SPACE_MAXADDR,      /* highaddr */
  567                                 NULL, NULL,             /* filter, filterarg */
  568                                 TW_CL_MAX_IO_SIZE,      /* maxsize */
  569                                 max_sg_elements,        /* nsegments */
  570                                 TW_CL_MAX_IO_SIZE,      /* maxsegsize */
  571                                 BUS_DMA_ALLOCNOW,       /* flags */
  572                                 twa_busdma_lock,        /* lockfunc */
  573                                 sc->io_lock,            /* lockfuncarg */
  574                                 &sc->dma_tag            /* tag */)) {
  575                 tw_osli_printf(sc, "error = %d",
  576                         TW_CL_SEVERITY_ERROR_STRING,
  577                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  578                         0x200F,
  579                         "Can't allocate DMA tag for data buffers",
  580                         ENOMEM);
  581                 return(ENOMEM);
  582         }
  583 
  584         /*
  585          * Create a dma tag for ioctl data buffers; size will be the maximum
  586          * possible I/O size (128kB).
  587          */
  588         if (bus_dma_tag_create(sc->parent_tag,          /* parent */
  589                                 sc->alignment,          /* alignment */
  590                                 0,                      /* boundary */
  591                                 BUS_SPACE_MAXADDR,      /* lowaddr */
  592                                 BUS_SPACE_MAXADDR,      /* highaddr */
  593                                 NULL, NULL,             /* filter, filterarg */
  594                                 TW_CL_MAX_IO_SIZE,      /* maxsize */
  595                                 max_sg_elements,        /* nsegments */
  596                                 TW_CL_MAX_IO_SIZE,      /* maxsegsize */
  597                                 BUS_DMA_ALLOCNOW,       /* flags */
  598                                 twa_busdma_lock,        /* lockfunc */
  599                                 sc->io_lock,            /* lockfuncarg */
  600                                 &sc->ioctl_tag          /* tag */)) {
  601                 tw_osli_printf(sc, "error = %d",
  602                         TW_CL_SEVERITY_ERROR_STRING,
  603                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  604                         0x2010,
  605                         "Can't allocate DMA tag for ioctl data buffers",
  606                         ENOMEM);
  607                 return(ENOMEM);
  608         }
  609 
  610         /* Create just one map for all ioctl request data buffers. */
  611         if (bus_dmamap_create(sc->ioctl_tag, 0, &sc->ioctl_map)) {
  612                 tw_osli_printf(sc, "error = %d",
  613                         TW_CL_SEVERITY_ERROR_STRING,
  614                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  615                         0x2011,
  616                         "Can't create ioctl map",
  617                         ENOMEM);
  618                 return(ENOMEM);
  619         }
  620 
  621 
  622         /* Initialize request queues. */
  623         tw_osli_req_q_init(sc, TW_OSLI_FREE_Q);
  624         tw_osli_req_q_init(sc, TW_OSLI_BUSY_Q);
  625 
  626         if ((sc->req_ctxt_buf = (struct tw_osli_req_context *)
  627                         malloc((sizeof(struct tw_osli_req_context) *
  628                                 TW_OSLI_MAX_NUM_IOS),
  629                                 TW_OSLI_MALLOC_CLASS, M_WAITOK)) == NULL) {
  630                 tw_osli_printf(sc, "error = %d",
  631                         TW_CL_SEVERITY_ERROR_STRING,
  632                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  633                         0x2012,
  634                         "Failed to allocate request packets",
  635                         ENOMEM);
  636                 return(ENOMEM);
  637         }
  638         bzero(sc->req_ctxt_buf,
  639                 sizeof(struct tw_osli_req_context) * TW_OSLI_MAX_NUM_IOS);
  640 
  641         for (i = 0; i < TW_OSLI_MAX_NUM_IOS; i++) {
  642                 req = &(sc->req_ctxt_buf[i]);
  643                 req->ctlr = sc;
  644                 if (bus_dmamap_create(sc->dma_tag, 0, &req->dma_map)) {
  645                         tw_osli_printf(sc, "request # = %d, error = %d",
  646                                 TW_CL_SEVERITY_ERROR_STRING,
  647                                 TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  648                                 0x2013,
  649                                 "Can't create dma map",
  650                                 i, ENOMEM);
  651                         return(ENOMEM);
  652                 }
  653 
  654                 /* Insert request into the free queue. */
  655                 tw_osli_req_q_insert_tail(req, TW_OSLI_FREE_Q);
  656         }
  657 
  658         return(0);
  659 }
  660 
  661 
  662 
  663 /*
  664  * Function name:       tw_osli_free_resources
  665  * Description:         Performs clean-up at the time of going down.
  666  *
  667  * Input:               sc      -- ptr to OSL internal ctlr context
  668  * Output:              None
  669  * Return value:        None
  670  */
  671 static TW_VOID
  672 tw_osli_free_resources(struct twa_softc *sc)
  673 {
  674         struct tw_osli_req_context      *req;
  675         TW_INT32                        error = 0;
  676 
  677         tw_osli_dbg_dprintf(3, sc, "entered");
  678 
  679         /* Detach from CAM */
  680         tw_osli_cam_detach(sc);
  681 
  682         if (sc->req_ctxt_buf)
  683                 while ((req = tw_osli_req_q_remove_head(sc, TW_OSLI_FREE_Q)) !=
  684                         NULL)
  685                         if ((error = bus_dmamap_destroy(sc->dma_tag,
  686                                         req->dma_map)))
  687                                 tw_osli_dbg_dprintf(1, sc,
  688                                         "dmamap_destroy(dma) returned %d",
  689                                         error);
  690 
  691         if ((sc->ioctl_tag) && (sc->ioctl_map))
  692                 if ((error = bus_dmamap_destroy(sc->ioctl_tag, sc->ioctl_map)))
  693                         tw_osli_dbg_dprintf(1, sc,
  694                                 "dmamap_destroy(ioctl) returned %d", error);
  695 
  696         /* Free all memory allocated so far. */
  697         if (sc->req_ctxt_buf)
  698                 free(sc->req_ctxt_buf, TW_OSLI_MALLOC_CLASS);
  699 
  700         if (sc->non_dma_mem)
  701                 free(sc->non_dma_mem, TW_OSLI_MALLOC_CLASS);
  702 
  703         if (sc->dma_mem) {
  704                 bus_dmamap_unload(sc->cmd_tag, sc->cmd_map);
  705                 bus_dmamem_free(sc->cmd_tag, sc->dma_mem,
  706                         sc->cmd_map);
  707         }
  708         if (sc->cmd_tag)
  709                 if ((error = bus_dma_tag_destroy(sc->cmd_tag)))
  710                         tw_osli_dbg_dprintf(1, sc,
  711                                 "dma_tag_destroy(cmd) returned %d", error);
  712 
  713         if (sc->dma_tag)
  714                 if ((error = bus_dma_tag_destroy(sc->dma_tag)))
  715                         tw_osli_dbg_dprintf(1, sc,
  716                                 "dma_tag_destroy(dma) returned %d", error);
  717 
  718         if (sc->ioctl_tag)
  719                 if ((error = bus_dma_tag_destroy(sc->ioctl_tag)))
  720                         tw_osli_dbg_dprintf(1, sc,
  721                                 "dma_tag_destroy(ioctl) returned %d", error);
  722 
  723         if (sc->parent_tag)
  724                 if ((error = bus_dma_tag_destroy(sc->parent_tag)))
  725                         tw_osli_dbg_dprintf(1, sc,
  726                                 "dma_tag_destroy(parent) returned %d", error);
  727 
  728 
  729         /* Disconnect the interrupt handler. */
  730         if (sc->intr_handle)
  731                 if ((error = bus_teardown_intr(sc->bus_dev,
  732                                 sc->irq_res, sc->intr_handle)))
  733                         tw_osli_dbg_dprintf(1, sc,
  734                                 "teardown_intr returned %d", error);
  735 
  736         if (sc->irq_res != NULL)
  737                 if ((error = bus_release_resource(sc->bus_dev,
  738                                 SYS_RES_IRQ, sc->irq_res_id, sc->irq_res)))
  739                         tw_osli_dbg_dprintf(1, sc,
  740                                 "release_resource(irq) returned %d", error);
  741 
  742 
  743         /* Release the register window mapping. */
  744         if (sc->reg_res != NULL)
  745                 if ((error = bus_release_resource(sc->bus_dev,
  746                                 SYS_RES_MEMORY, sc->reg_res_id, sc->reg_res)))
  747                         tw_osli_dbg_dprintf(1, sc,
  748                                 "release_resource(io) returned %d", error);
  749 
  750 
  751         /* Destroy the control device. */
  752         if (sc->ctrl_dev != (struct cdev *)NULL)
  753                 destroy_dev(sc->ctrl_dev);
  754 
  755         if ((error = sysctl_ctx_free(&sc->sysctl_ctxt)))
  756                 tw_osli_dbg_dprintf(1, sc,
  757                         "sysctl_ctx_free returned %d", error);
  758 
  759 }
  760 
  761 
  762 
  763 /*
  764  * Function name:       twa_detach
  765  * Description:         Called when the controller is being detached from
  766  *                      the pci bus.
  767  *
  768  * Input:               dev     -- bus device corresponding to the ctlr
  769  * Output:              None
  770  * Return value:        0       -- success
  771  *                      non-zero-- failure
  772  */
  773 static TW_INT32
  774 twa_detach(device_t dev)
  775 {
  776         struct twa_softc        *sc = device_get_softc(dev);
  777         TW_INT32                error;
  778 
  779         tw_osli_dbg_dprintf(3, sc, "entered");
  780 
  781         error = EBUSY;
  782         if (sc->state & TW_OSLI_CTLR_STATE_OPEN) {
  783                 tw_osli_printf(sc, "error = %d",
  784                         TW_CL_SEVERITY_ERROR_STRING,
  785                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  786                         0x2014,
  787                         "Device open",
  788                         error);
  789                 goto out;
  790         }
  791 
  792         /* Shut the controller down. */
  793         if ((error = twa_shutdown(dev)))
  794                 goto out;
  795 
  796         /* Free all resources associated with this controller. */
  797         tw_osli_free_resources(sc);
  798         error = 0;
  799 
  800 out:
  801         return(error);
  802 }
  803 
  804 
  805 
  806 /*
  807  * Function name:       twa_shutdown
  808  * Description:         Called at unload/shutdown time.  Lets the controller
  809  *                      know that we are going down.
  810  *
  811  * Input:               dev     -- bus device corresponding to the ctlr
  812  * Output:              None
  813  * Return value:        0       -- success
  814  *                      non-zero-- failure
  815  */
  816 static TW_INT32
  817 twa_shutdown(device_t dev)
  818 {
  819         struct twa_softc        *sc = device_get_softc(dev);
  820         TW_INT32                error = 0;
  821 
  822         tw_osli_dbg_dprintf(3, sc, "entered");
  823 
  824         /* Disconnect from the controller. */
  825         if ((error = tw_cl_shutdown_ctlr(&(sc->ctlr_handle), 0))) {
  826                 tw_osli_printf(sc, "error = %d",
  827                         TW_CL_SEVERITY_ERROR_STRING,
  828                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  829                         0x2015,
  830                         "Failed to shutdown Common Layer/controller",
  831                         error);
  832         }
  833         return(error);
  834 }
  835 
  836 
  837 
  838 /*
  839  * Function name:       twa_busdma_lock
  840  * Description:         Function to provide synchronization during busdma_swi.
  841  *
  842  * Input:               lock_arg -- lock mutex sent as argument
  843  *                      op -- operation (lock/unlock) expected of the function
  844  * Output:              None
  845  * Return value:        None
  846  */
  847 TW_VOID
  848 twa_busdma_lock(TW_VOID *lock_arg, bus_dma_lock_op_t op)
  849 {
  850         struct mtx      *lock;
  851 
  852         lock = (struct mtx *)lock_arg;
  853         switch (op) {
  854         case BUS_DMA_LOCK:
  855                 mtx_lock_spin(lock);
  856                 break;
  857 
  858         case BUS_DMA_UNLOCK:
  859                 mtx_unlock_spin(lock);
  860                 break;
  861 
  862         default:
  863                 panic("Unknown operation 0x%x for twa_busdma_lock!", op);
  864         }
  865 }
  866 
  867 
  868 #ifdef TW_OSLI_DEFERRED_INTR_USED
  869 /*
  870  * Function name:       twa_pci_intr_fast
  871  * Description:         Interrupt handler.  Wrapper for twa_interrupt.
  872  *
  873  * Input:               arg     -- ptr to OSL internal ctlr context
  874  * Output:              FILTER_HANDLED or FILTER_STRAY
  875  * Return value:        None
  876  */
  877 static int
  878 twa_pci_intr_fast(TW_VOID *arg)
  879 {
  880         struct twa_softc        *sc = (struct twa_softc *)arg;
  881 
  882         tw_osli_dbg_dprintf(10, sc, "entered");
  883         if (tw_cl_interrupt(&(sc->ctlr_handle))) {
  884                 taskqueue_enqueue_fast(taskqueue_fast,
  885                         &(sc->deferred_intr_callback));
  886                 return(FILTER_HANDLED);
  887         }
  888         return(FILTER_STRAY);
  889 }
  890 #else
  891 /*
  892  * Function name:       twa_pci_intr
  893  * Description:         Interrupt handler.  Wrapper for twa_interrupt.
  894  *
  895  * Input:               arg     -- ptr to OSL internal ctlr context
  896  * Output:              None
  897  * Return value:        None
  898  */
  899 static TW_VOID
  900 twa_pci_intr(TW_VOID *arg)
  901 {
  902         struct twa_softc        *sc = (struct twa_softc *)arg;
  903 
  904         tw_osli_dbg_dprintf(10, sc, "entered");
  905         if (tw_cl_interrupt(&(sc->ctlr_handle)))
  906                 tw_cl_deferred_interrupt(&(sc->ctlr_handle));
  907 }
  908 #endif
  909 
  910 #ifdef TW_OSLI_DEFERRED_INTR_USED
  911 
  912 /*
  913  * Function name:       twa_deferred_intr
  914  * Description:         Deferred interrupt handler.
  915  *
  916  * Input:               context -- ptr to OSL internal ctlr context
  917  *                      pending -- not used
  918  * Output:              None
  919  * Return value:        None
  920  */
  921 static TW_VOID
  922 twa_deferred_intr(TW_VOID *context, TW_INT32 pending)
  923 {
  924         struct twa_softc        *sc = (struct twa_softc *)context;
  925 
  926         tw_osli_dbg_dprintf(10, sc, "entered");
  927 
  928         tw_cl_deferred_interrupt(&(sc->ctlr_handle));
  929 }
  930 
  931 #endif /* TW_OSLI_DEFERRED_INTR_USED */
  932 
  933 
  934 
  935 /*
  936  * Function name:       tw_osli_fw_passthru
  937  * Description:         Builds a fw passthru cmd pkt, and submits it to CL.
  938  *
  939  * Input:               sc      -- ptr to OSL internal ctlr context
  940  *                      buf     -- ptr to ioctl pkt understood by CL
  941  * Output:              None
  942  * Return value:        0       -- success
  943  *                      non-zero-- failure
  944  */
  945 TW_INT32
  946 tw_osli_fw_passthru(struct twa_softc *sc, TW_INT8 *buf)
  947 {
  948         struct tw_osli_req_context              *req;
  949         struct tw_osli_ioctl_no_data_buf        *user_buf =
  950                 (struct tw_osli_ioctl_no_data_buf *)buf;
  951         TW_TIME                                 end_time;
  952         TW_UINT32                               timeout = 60;
  953         TW_UINT32                               data_buf_size_adjusted;
  954         struct tw_cl_req_packet                 *req_pkt;
  955         struct tw_cl_passthru_req_packet        *pt_req;
  956         TW_INT32                                error;
  957 
  958         tw_osli_dbg_dprintf(5, sc, "ioctl: passthru");
  959                 
  960         if ((req = tw_osli_get_request(sc)) == NULL)
  961                 return(EBUSY);
  962 
  963         req->req_handle.osl_req_ctxt = req;
  964         req->orig_req = buf;
  965         req->flags |= TW_OSLI_REQ_FLAGS_PASSTHRU;
  966 
  967         req_pkt = &(req->req_pkt);
  968         req_pkt->status = 0;
  969         req_pkt->tw_osl_callback = tw_osl_complete_passthru;
  970         /* Let the Common Layer retry the request on cmd queue full. */
  971         req_pkt->flags |= TW_CL_REQ_RETRY_ON_BUSY;
  972 
  973         pt_req = &(req_pkt->gen_req_pkt.pt_req);
  974         /*
  975          * Make sure that the data buffer sent to firmware is a 
  976          * 512 byte multiple in size.
  977          */
  978         data_buf_size_adjusted =
  979                 (user_buf->driver_pkt.buffer_length +
  980                 (sc->sg_size_factor - 1)) & ~(sc->sg_size_factor - 1);
  981         if ((req->length = data_buf_size_adjusted)) {
  982                 if ((req->data = malloc(data_buf_size_adjusted,
  983                         TW_OSLI_MALLOC_CLASS, M_WAITOK)) == NULL) {
  984                         error = ENOMEM;
  985                         tw_osli_printf(sc, "error = %d",
  986                                 TW_CL_SEVERITY_ERROR_STRING,
  987                                 TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
  988                                 0x2016,
  989                                 "Could not alloc mem for "
  990                                 "fw_passthru data_buf",
  991                                 error);
  992                         goto fw_passthru_err;
  993                 }
  994                 /* Copy the payload. */
  995                 if ((error = copyin((TW_VOID *)(user_buf->pdata), 
  996                         req->data,
  997                         user_buf->driver_pkt.buffer_length)) != 0) {
  998                         tw_osli_printf(sc, "error = %d",
  999                                 TW_CL_SEVERITY_ERROR_STRING,
 1000                                 TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1001                                 0x2017,
 1002                                 "Could not copyin fw_passthru data_buf",
 1003                                 error);
 1004                         goto fw_passthru_err;
 1005                 }
 1006                 pt_req->sgl_entries = 1; /* will be updated during mapping */
 1007                 req->flags |= (TW_OSLI_REQ_FLAGS_DATA_IN |
 1008                         TW_OSLI_REQ_FLAGS_DATA_OUT);
 1009         } else
 1010                 pt_req->sgl_entries = 0; /* no payload */
 1011 
 1012         pt_req->cmd_pkt = (TW_VOID *)(&(user_buf->cmd_pkt));
 1013         pt_req->cmd_pkt_length = sizeof(struct tw_cl_command_packet);
 1014 
 1015         if ((error = tw_osli_map_request(req)))
 1016                 goto fw_passthru_err;
 1017 
 1018         end_time = tw_osl_get_local_time() + timeout;
 1019         while (req->state != TW_OSLI_REQ_STATE_COMPLETE) {
 1020                 req->flags |= TW_OSLI_REQ_FLAGS_SLEEPING;
 1021                 
 1022                 error = tsleep(req, PRIBIO, "twa_passthru", timeout * hz);
 1023 
 1024                 if (!(req->flags & TW_OSLI_REQ_FLAGS_SLEEPING))
 1025                         error = 0;
 1026                 req->flags &= ~TW_OSLI_REQ_FLAGS_SLEEPING;
 1027 
 1028                 if (! error) {
 1029                         if (((error = req->error_code)) ||
 1030                                 ((error = (req->state !=
 1031                                 TW_OSLI_REQ_STATE_COMPLETE))) ||
 1032                                 ((error = req_pkt->status)))
 1033                                 goto fw_passthru_err;
 1034                         break;
 1035                 }
 1036 
 1037                 if (req_pkt->status) {
 1038                         error = req_pkt->status;
 1039                         goto fw_passthru_err;
 1040                 }
 1041 
 1042                 if (error == EWOULDBLOCK) {
 1043                         /* Time out! */
 1044                         tw_osli_printf(sc, "request = %p",
 1045                                 TW_CL_SEVERITY_ERROR_STRING,
 1046                                 TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1047                                 0x2018,
 1048                                 "Passthru request timed out!",
 1049                                 req);
 1050                         /*
 1051                          * Should I check here if the timeout happened
 1052                          * because of yet another reset, and not do a
 1053                          * second reset?
 1054                          */
 1055                         tw_cl_reset_ctlr(&sc->ctlr_handle);
 1056                         /*
 1057                          * Don't touch req after a reset.  It (and any
 1058                          * associated data) will already have been
 1059                          * unmapped by the callback.
 1060                          */
 1061                         user_buf->driver_pkt.os_status = error;
 1062                         error = ETIMEDOUT;
 1063                         goto fw_passthru_err;
 1064                 }
 1065                 /* 
 1066                  * Either the request got completed, or we were woken up by a
 1067                  * signal.  Calculate the new timeout, in case it was the latter.
 1068                  */
 1069                 timeout = (end_time - tw_osl_get_local_time());
 1070         }
 1071 
 1072         /* If there was a payload, copy it back. */
 1073         if ((!error) && (req->length))
 1074                 if ((error = copyout(req->data, user_buf->pdata,
 1075                         user_buf->driver_pkt.buffer_length)))
 1076                         tw_osli_printf(sc, "error = %d",
 1077                                 TW_CL_SEVERITY_ERROR_STRING,
 1078                                 TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1079                                 0x2019,
 1080                                 "Could not copyout fw_passthru data_buf",
 1081                                 error);
 1082         
 1083 fw_passthru_err:
 1084         /*
 1085          * Print the failure message.  For some reason, on certain OS versions,
 1086          * printing this error message during reset hangs the display (although
 1087          * the rest of the system is running fine.  So, don't print it if the
 1088          * failure was due to a reset.
 1089          */
 1090         if ((error) && (error != TW_CL_ERR_REQ_BUS_RESET))
 1091                 tw_osli_printf(sc, "error = %d",                
 1092                         TW_CL_SEVERITY_ERROR_STRING,
 1093                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1094                         0x201A,
 1095                         "Firmware passthru failed!",
 1096                         error);
 1097 
 1098         user_buf->driver_pkt.os_status = error;
 1099         /* Free resources. */
 1100         if (req->data)
 1101                 free(req->data, TW_OSLI_MALLOC_CLASS);
 1102         tw_osli_req_q_insert_tail(req, TW_OSLI_FREE_Q);
 1103         return(error);
 1104 }
 1105 
 1106 
 1107 
 1108 /*
 1109  * Function name:       tw_osl_complete_passthru
 1110  * Description:         Called to complete passthru requests.
 1111  *
 1112  * Input:               req_handle      -- ptr to request handle
 1113  * Output:              None
 1114  * Return value:        None
 1115  */
 1116 TW_VOID
 1117 tw_osl_complete_passthru(struct tw_cl_req_handle *req_handle)
 1118 {
 1119         struct tw_osli_req_context      *req = req_handle->osl_req_ctxt;
 1120         struct twa_softc                *sc = req->ctlr;
 1121 
 1122         tw_osli_dbg_dprintf(5, sc, "entered");
 1123 
 1124         if (req->state != TW_OSLI_REQ_STATE_BUSY) {
 1125                 tw_osli_printf(sc, "request = %p, status = %d",
 1126                         TW_CL_SEVERITY_ERROR_STRING,
 1127                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1128                         0x201B,
 1129                         "Unposted command completed!!",
 1130                         req, req->state);
 1131         }
 1132 
 1133         /*
 1134          * Remove request from the busy queue.  Just mark it complete.
 1135          * There's no need to move it into the complete queue as we are
 1136          * going to be done with it right now.
 1137          */
 1138         req->state = TW_OSLI_REQ_STATE_COMPLETE;
 1139         tw_osli_req_q_remove_item(req, TW_OSLI_BUSY_Q);
 1140 
 1141         tw_osli_unmap_request(req);
 1142 
 1143         /*
 1144          * Don't do a wake up if there was an error even before the request
 1145          * was sent down to the Common Layer, and we hadn't gotten an
 1146          * EINPROGRESS.  The request originator will then be returned an
 1147          * error, and he can do the clean-up.
 1148          */
 1149         if ((req->error_code) &&
 1150                 (!(req->state & TW_OSLI_REQ_FLAGS_IN_PROGRESS)))
 1151                 return;
 1152 
 1153         if (req->flags & TW_OSLI_REQ_FLAGS_PASSTHRU) {
 1154                 if (req->flags & TW_OSLI_REQ_FLAGS_SLEEPING) {
 1155                         /* Wake up the sleeping command originator. */
 1156                         tw_osli_dbg_dprintf(5, sc,
 1157                                 "Waking up originator of request %p", req);
 1158                         req->flags &= ~TW_OSLI_REQ_FLAGS_SLEEPING;
 1159                         wakeup_one(req);
 1160                 } else {
 1161                         /*
 1162                          * If the request completed even before tsleep
 1163                          * was called, simply return.
 1164                          */
 1165                         if (req->flags & TW_OSLI_REQ_FLAGS_MAPPED)
 1166                                 return;
 1167 
 1168                         tw_osli_printf(sc, "request = %p",
 1169                                 TW_CL_SEVERITY_ERROR_STRING,
 1170                                 TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1171                                 0x201C,
 1172                                 "Passthru callback called, "
 1173                                 "and caller not sleeping",
 1174                                 req);
 1175                 }
 1176         } else {
 1177                 tw_osli_printf(sc, "request = %p",
 1178                         TW_CL_SEVERITY_ERROR_STRING,
 1179                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1180                         0x201D,
 1181                         "Passthru callback called for non-passthru request",
 1182                         req);
 1183         }
 1184 }
 1185 
 1186 
 1187 
 1188 /*
 1189  * Function name:       tw_osli_get_request
 1190  * Description:         Gets a request pkt from the free queue.
 1191  *
 1192  * Input:               sc      -- ptr to OSL internal ctlr context
 1193  * Output:              None
 1194  * Return value:        ptr to request pkt      -- success
 1195  *                      NULL                    -- failure
 1196  */
 1197 struct tw_osli_req_context *
 1198 tw_osli_get_request(struct twa_softc *sc)
 1199 {
 1200         struct tw_osli_req_context      *req;
 1201 
 1202         tw_osli_dbg_dprintf(4, sc, "entered");
 1203 
 1204         /* Get a free request packet. */
 1205         req = tw_osli_req_q_remove_head(sc, TW_OSLI_FREE_Q);
 1206 
 1207         /* Initialize some fields to their defaults. */
 1208         if (req) {
 1209                 req->req_handle.osl_req_ctxt = NULL;
 1210                 req->req_handle.cl_req_ctxt = NULL;
 1211                 req->data = NULL;
 1212                 req->length = 0;
 1213                 req->real_data = NULL;
 1214                 req->real_length = 0;
 1215                 req->state = TW_OSLI_REQ_STATE_INIT;/* req being initialized */
 1216                 req->flags = 0;
 1217                 req->error_code = 0;
 1218                 req->orig_req = NULL;
 1219 
 1220                 bzero(&(req->req_pkt), sizeof(struct tw_cl_req_packet));
 1221 
 1222         }
 1223         return(req);
 1224 }
 1225 
 1226 
 1227 
 1228 /*
 1229  * Function name:       twa_map_load_data_callback
 1230  * Description:         Callback of bus_dmamap_load for the buffer associated
 1231  *                      with data.  Updates the cmd pkt (size/sgl_entries
 1232  *                      fields, as applicable) to reflect the number of sg
 1233  *                      elements.
 1234  *
 1235  * Input:               arg     -- ptr to OSL internal request context
 1236  *                      segs    -- ptr to a list of segment descriptors
 1237  *                      nsegments--# of segments
 1238  *                      error   -- 0 if no errors encountered before callback,
 1239  *                                 non-zero if errors were encountered
 1240  * Output:              None
 1241  * Return value:        None
 1242  */
 1243 static TW_VOID
 1244 twa_map_load_data_callback(TW_VOID *arg, bus_dma_segment_t *segs,
 1245         TW_INT32 nsegments, TW_INT32 error)
 1246 {
 1247         struct tw_osli_req_context      *req =
 1248                 (struct tw_osli_req_context *)arg;
 1249         struct twa_softc                *sc = req->ctlr;
 1250         struct tw_cl_req_packet         *req_pkt = &(req->req_pkt);
 1251 
 1252         tw_osli_dbg_dprintf(10, sc, "entered");
 1253 
 1254         /* Mark the request as currently being processed. */
 1255         req->state = TW_OSLI_REQ_STATE_BUSY;
 1256         /* Move the request into the busy queue. */
 1257         tw_osli_req_q_insert_tail(req, TW_OSLI_BUSY_Q);
 1258 
 1259         req->flags |= TW_OSLI_REQ_FLAGS_MAPPED;
 1260         if (req->flags & TW_OSLI_REQ_FLAGS_IN_PROGRESS)
 1261                 tw_osli_allow_new_requests(sc, (TW_VOID *)(req->orig_req));
 1262 
 1263         if (error == EFBIG) {
 1264                 req->error_code = error;
 1265                 goto out;
 1266         }
 1267 
 1268         if (req->flags & TW_OSLI_REQ_FLAGS_PASSTHRU) {
 1269                 struct tw_cl_passthru_req_packet        *pt_req;
 1270 
 1271                 if (req->flags & TW_OSLI_REQ_FLAGS_DATA_IN)
 1272                         bus_dmamap_sync(sc->ioctl_tag, sc->ioctl_map,
 1273                                 BUS_DMASYNC_PREREAD);
 1274 
 1275                 if (req->flags & TW_OSLI_REQ_FLAGS_DATA_OUT) {
 1276                         /* 
 1277                          * If we're using an alignment buffer, and we're
 1278                          * writing data, copy the real data out.
 1279                          */
 1280                         if (req->flags & TW_OSLI_REQ_FLAGS_DATA_COPY_NEEDED)
 1281                                 bcopy(req->real_data, req->data, req->real_length);
 1282                         bus_dmamap_sync(sc->ioctl_tag, sc->ioctl_map,
 1283                                 BUS_DMASYNC_PREWRITE);
 1284                 }
 1285 
 1286                 pt_req = &(req_pkt->gen_req_pkt.pt_req);
 1287                 pt_req->sg_list = (TW_UINT8 *)segs;
 1288                 pt_req->sgl_entries += (nsegments - 1);
 1289                 error = tw_cl_fw_passthru(&(sc->ctlr_handle), req_pkt,
 1290                         &(req->req_handle));
 1291         } else {
 1292                 struct tw_cl_scsi_req_packet    *scsi_req;
 1293 
 1294                 if (req->flags & TW_OSLI_REQ_FLAGS_DATA_IN)
 1295                         bus_dmamap_sync(sc->dma_tag, req->dma_map,
 1296                                 BUS_DMASYNC_PREREAD);
 1297 
 1298                 if (req->flags & TW_OSLI_REQ_FLAGS_DATA_OUT) {
 1299                         /* 
 1300                          * If we're using an alignment buffer, and we're
 1301                          * writing data, copy the real data out.
 1302                          */
 1303                         if (req->flags & TW_OSLI_REQ_FLAGS_DATA_COPY_NEEDED)
 1304                                 bcopy(req->real_data, req->data, req->real_length);
 1305                         bus_dmamap_sync(sc->dma_tag, req->dma_map,
 1306                                 BUS_DMASYNC_PREWRITE);
 1307                 }
 1308 
 1309                 scsi_req = &(req_pkt->gen_req_pkt.scsi_req);
 1310                 scsi_req->sg_list = (TW_UINT8 *)segs;
 1311                 scsi_req->sgl_entries += (nsegments - 1);
 1312                 error = tw_cl_start_io(&(sc->ctlr_handle), req_pkt,
 1313                         &(req->req_handle));
 1314         }
 1315 
 1316 out:
 1317         if (error) {
 1318                 req->error_code = error;
 1319                 req_pkt->tw_osl_callback(&(req->req_handle));
 1320                 /*
 1321                  * If the caller had been returned EINPROGRESS, and he has
 1322                  * registered a callback for handling completion, the callback
 1323                  * will never get called because we were unable to submit the
 1324                  * request.  So, free up the request right here.
 1325                  */
 1326                 if (req->flags & TW_OSLI_REQ_FLAGS_IN_PROGRESS)
 1327                         tw_osli_req_q_insert_tail(req, TW_OSLI_FREE_Q);
 1328         }
 1329 }
 1330 
 1331 
 1332 
 1333 /*
 1334  * Function name:       twa_map_load_callback
 1335  * Description:         Callback of bus_dmamap_load for the buffer associated
 1336  *                      with a cmd pkt.
 1337  *
 1338  * Input:               arg     -- ptr to variable to hold phys addr
 1339  *                      segs    -- ptr to a list of segment descriptors
 1340  *                      nsegments--# of segments
 1341  *                      error   -- 0 if no errors encountered before callback,
 1342  *                                 non-zero if errors were encountered
 1343  * Output:              None
 1344  * Return value:        None
 1345  */
 1346 static TW_VOID
 1347 twa_map_load_callback(TW_VOID *arg, bus_dma_segment_t *segs,
 1348         TW_INT32 nsegments, TW_INT32 error)
 1349 {
 1350         *((TW_UINT64 *)arg) = segs[0].ds_addr;
 1351 }
 1352 
 1353 
 1354 
 1355 /*
 1356  * Function name:       tw_osli_map_request
 1357  * Description:         Maps a cmd pkt and data associated with it, into
 1358  *                      DMA'able memory.
 1359  *
 1360  * Input:               req     -- ptr to request pkt
 1361  * Output:              None
 1362  * Return value:        0       -- success
 1363  *                      non-zero-- failure
 1364  */
 1365 TW_INT32
 1366 tw_osli_map_request(struct tw_osli_req_context *req)
 1367 {
 1368         struct twa_softc        *sc = req->ctlr;
 1369         TW_INT32                error = 0;
 1370 
 1371         tw_osli_dbg_dprintf(10, sc, "entered");
 1372 
 1373         /* If the command involves data, map that too. */
 1374         if (req->data != NULL) {
 1375                 /*
 1376                  * It's sufficient for the data pointer to be 4-byte aligned
 1377                  * to work with 9000.  However, if 4-byte aligned addresses
 1378                  * are passed to bus_dmamap_load, we can get back sg elements
 1379                  * that are not 512-byte multiples in size.  So, we will let
 1380                  * only those buffers that are 512-byte aligned to pass
 1381                  * through, and bounce the rest, so as to make sure that we
 1382                  * always get back sg elements that are 512-byte multiples
 1383                  * in size.
 1384                  */
 1385                 if (((vm_offset_t)req->data % sc->sg_size_factor) ||
 1386                         (req->length % sc->sg_size_factor)) {
 1387                         req->flags |= TW_OSLI_REQ_FLAGS_DATA_COPY_NEEDED;
 1388                         /* Save original data pointer and length. */
 1389                         req->real_data = req->data;
 1390                         req->real_length = req->length;
 1391                         req->length = (req->length +
 1392                                 (sc->sg_size_factor - 1)) &
 1393                                 ~(sc->sg_size_factor - 1);
 1394                         req->data = malloc(req->length, TW_OSLI_MALLOC_CLASS,
 1395                                         M_NOWAIT);
 1396                         if (req->data == NULL) {
 1397                                 tw_osli_printf(sc, "error = %d",
 1398                                         TW_CL_SEVERITY_ERROR_STRING,
 1399                                         TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
 1400                                         0x201E,
 1401                                         "Failed to allocate memory "
 1402                                         "for bounce buffer",
 1403                                         ENOMEM);
 1404                                 /* Restore original data pointer and length. */
 1405                                 req->data = req->real_data;
 1406                                 req->length = req->real_length;
 1407                                 return(ENOMEM);
 1408                         }
 1409                 }
 1410         
 1411                 /*
 1412                  * Map the data buffer into bus space and build the SG list.
 1413                  */
 1414                 if (req->flags & TW_OSLI_REQ_FLAGS_PASSTHRU) {
 1415                         /* Lock against multiple simultaneous ioctl calls. */
 1416                         mtx_lock_spin(sc->io_lock);
 1417                         error = bus_dmamap_load(sc->ioctl_tag, sc->ioctl_map,
 1418                                 req->data, req->length,
 1419                                 twa_map_load_data_callback, req,
 1420                                 BUS_DMA_WAITOK);
 1421                         mtx_unlock_spin(sc->io_lock);
 1422                 } else {
 1423                         /*
 1424                          * There's only one CAM I/O thread running at a time.
 1425                          * So, there's no need to hold the io_lock.
 1426                          */
 1427                         error = bus_dmamap_load(sc->dma_tag, req->dma_map,
 1428                                 req->data, req->length,
 1429                                 twa_map_load_data_callback, req,
 1430                                 BUS_DMA_WAITOK);
 1431                 }
 1432                 
 1433                 if (!error)
 1434                         error = req->error_code;
 1435                 else {
 1436                         if (error == EINPROGRESS) {
 1437                                 /*
 1438                                  * Specifying sc->io_lock as the lockfuncarg
 1439                                  * in ...tag_create should protect the access
 1440                                  * of ...FLAGS_MAPPED from the callback.
 1441                                  */
 1442                                 mtx_lock_spin(sc->io_lock);
 1443                                 if (!(req->flags & TW_OSLI_REQ_FLAGS_MAPPED)) {
 1444                                         req->flags |=
 1445                                                 TW_OSLI_REQ_FLAGS_IN_PROGRESS;
 1446                                         tw_osli_disallow_new_requests(sc);
 1447                                 }
 1448                                 mtx_unlock_spin(sc->io_lock);
 1449                                 error = 0;
 1450                         } else {
 1451                                 /* Free alignment buffer if it was used. */
 1452                                 if (req->flags &
 1453                                         TW_OSLI_REQ_FLAGS_DATA_COPY_NEEDED) {
 1454                                         free(req->data, TW_OSLI_MALLOC_CLASS);
 1455                                         /*
 1456                                          * Restore original data pointer
 1457                                          * and length.
 1458                                          */
 1459                                         req->data = req->real_data;
 1460                                         req->length = req->real_length;
 1461                                 }
 1462                         }
 1463                 }
 1464 
 1465         } else {
 1466                 /* Mark the request as currently being processed. */
 1467                 req->state = TW_OSLI_REQ_STATE_BUSY;
 1468                 /* Move the request into the busy queue. */
 1469                 tw_osli_req_q_insert_tail(req, TW_OSLI_BUSY_Q);
 1470                 if (req->flags & TW_OSLI_REQ_FLAGS_PASSTHRU)
 1471                         error = tw_cl_fw_passthru(&sc->ctlr_handle,
 1472                                         &(req->req_pkt), &(req->req_handle));
 1473                 else
 1474                         error = tw_cl_start_io(&sc->ctlr_handle,
 1475                                         &(req->req_pkt), &(req->req_handle));
 1476                 if (error) {
 1477                         req->error_code = error;
 1478                         req->req_pkt.tw_osl_callback(&(req->req_handle));
 1479                 }
 1480         }
 1481         return(error);
 1482 }
 1483 
 1484 
 1485 
 1486 /*
 1487  * Function name:       tw_osli_unmap_request
 1488  * Description:         Undoes the mapping done by tw_osli_map_request.
 1489  *
 1490  * Input:               req     -- ptr to request pkt
 1491  * Output:              None
 1492  * Return value:        None
 1493  */
 1494 TW_VOID
 1495 tw_osli_unmap_request(struct tw_osli_req_context *req)
 1496 {
 1497         struct twa_softc        *sc = req->ctlr;
 1498 
 1499         tw_osli_dbg_dprintf(10, sc, "entered");
 1500 
 1501         /* If the command involved data, unmap that too. */
 1502         if (req->data != NULL) {
 1503                 if (req->flags & TW_OSLI_REQ_FLAGS_PASSTHRU) {
 1504                         /* Lock against multiple simultaneous ioctl calls. */
 1505                         mtx_lock_spin(sc->io_lock);
 1506 
 1507                         if (req->flags & TW_OSLI_REQ_FLAGS_DATA_IN) {
 1508                                 bus_dmamap_sync(sc->ioctl_tag,
 1509                                         sc->ioctl_map, BUS_DMASYNC_POSTREAD);
 1510 
 1511                                 /* 
 1512                                  * If we are using a bounce buffer, and we are
 1513                                  * reading data, copy the real data in.
 1514                                  */
 1515                                 if (req->flags & TW_OSLI_REQ_FLAGS_DATA_COPY_NEEDED)
 1516                                         bcopy(req->data, req->real_data,
 1517                                                 req->real_length);
 1518                         }
 1519 
 1520                         if (req->flags & TW_OSLI_REQ_FLAGS_DATA_OUT)
 1521                                 bus_dmamap_sync(sc->ioctl_tag, sc->ioctl_map,
 1522                                         BUS_DMASYNC_POSTWRITE);
 1523 
 1524                         bus_dmamap_unload(sc->ioctl_tag, sc->ioctl_map);
 1525 
 1526                         mtx_unlock_spin(sc->io_lock);
 1527                 } else {
 1528                         if (req->flags & TW_OSLI_REQ_FLAGS_DATA_IN) {
 1529                                 bus_dmamap_sync(sc->dma_tag,
 1530                                         req->dma_map, BUS_DMASYNC_POSTREAD);
 1531 
 1532                                 /* 
 1533                                  * If we are using a bounce buffer, and we are
 1534                                  * reading data, copy the real data in.
 1535                                  */
 1536                                 if (req->flags & TW_OSLI_REQ_FLAGS_DATA_COPY_NEEDED)
 1537                                         bcopy(req->data, req->real_data,
 1538                                                 req->real_length);
 1539                         }
 1540                         if (req->flags & TW_OSLI_REQ_FLAGS_DATA_OUT)
 1541                                 bus_dmamap_sync(sc->dma_tag, req->dma_map,
 1542                                         BUS_DMASYNC_POSTWRITE);
 1543 
 1544                         bus_dmamap_unload(sc->dma_tag, req->dma_map);
 1545                 }
 1546         }
 1547 
 1548         /* Free alignment buffer if it was used. */
 1549         if (req->flags & TW_OSLI_REQ_FLAGS_DATA_COPY_NEEDED) {
 1550                 free(req->data, TW_OSLI_MALLOC_CLASS);
 1551                 /* Restore original data pointer and length. */
 1552                 req->data = req->real_data;
 1553                 req->length = req->real_length;
 1554         }
 1555 }
 1556 
 1557 
 1558 
 1559 #ifdef TW_OSL_DEBUG
 1560 
 1561 TW_VOID twa_report_stats(TW_VOID);
 1562 TW_VOID twa_reset_stats(TW_VOID);
 1563 TW_VOID tw_osli_print_ctlr_stats(struct twa_softc *sc);
 1564 TW_VOID twa_print_req_info(struct tw_osli_req_context *req);
 1565 
 1566 
 1567 /*
 1568  * Function name:       twa_report_stats
 1569  * Description:         For being called from ddb.  Calls functions that print
 1570  *                      OSL and CL internal stats for the controller.
 1571  *
 1572  * Input:               None
 1573  * Output:              None
 1574  * Return value:        None
 1575  */
 1576 TW_VOID
 1577 twa_report_stats(TW_VOID)
 1578 {
 1579         struct twa_softc        *sc;
 1580         TW_INT32                i;
 1581 
 1582         for (i = 0; (sc = devclass_get_softc(twa_devclass, i)) != NULL; i++) {
 1583                 tw_osli_print_ctlr_stats(sc);
 1584                 tw_cl_print_ctlr_stats(&sc->ctlr_handle);
 1585         }
 1586 }
 1587 
 1588 
 1589 
 1590 /*
 1591  * Function name:       tw_osli_print_ctlr_stats
 1592  * Description:         For being called from ddb.  Prints OSL controller stats
 1593  *
 1594  * Input:               sc      -- ptr to OSL internal controller context
 1595  * Output:              None
 1596  * Return value:        None
 1597  */
 1598 TW_VOID
 1599 tw_osli_print_ctlr_stats(struct twa_softc *sc)
 1600 {
 1601         twa_printf(sc, "osl_ctlr_ctxt = %p\n", sc);
 1602         twa_printf(sc, "OSLq type  current  max\n");
 1603         twa_printf(sc, "free      %04d     %04d\n",
 1604                 sc->q_stats[TW_OSLI_FREE_Q].cur_len,
 1605                 sc->q_stats[TW_OSLI_FREE_Q].max_len);
 1606         twa_printf(sc, "busy      %04d     %04d\n",
 1607                 sc->q_stats[TW_OSLI_BUSY_Q].cur_len,
 1608                 sc->q_stats[TW_OSLI_BUSY_Q].max_len);
 1609 }       
 1610 
 1611 
 1612 
 1613 /*
 1614  * Function name:       twa_print_req_info
 1615  * Description:         For being called from ddb.  Calls functions that print
 1616  *                      OSL and CL internal details for the request.
 1617  *
 1618  * Input:               req     -- ptr to OSL internal request context
 1619  * Output:              None
 1620  * Return value:        None
 1621  */
 1622 TW_VOID
 1623 twa_print_req_info(struct tw_osli_req_context *req)
 1624 {
 1625         struct twa_softc        *sc = req->ctlr;
 1626 
 1627         twa_printf(sc, "OSL details for request:\n");
 1628         twa_printf(sc, "osl_req_ctxt = %p, cl_req_ctxt = %p\n"
 1629                 "data = %p, length = 0x%x, real_data = %p, real_length = 0x%x\n"
 1630                 "state = 0x%x, flags = 0x%x, error = 0x%x, orig_req = %p\n"
 1631                 "next_req = %p, prev_req = %p, dma_map = %p\n",
 1632                 req->req_handle.osl_req_ctxt, req->req_handle.cl_req_ctxt,
 1633                 req->data, req->length, req->real_data, req->real_length,
 1634                 req->state, req->flags, req->error_code, req->orig_req,
 1635                 req->link.next, req->link.prev, req->dma_map);
 1636         tw_cl_print_req_info(&(req->req_handle));
 1637 }
 1638 
 1639 
 1640 
 1641 /*
 1642  * Function name:       twa_reset_stats
 1643  * Description:         For being called from ddb.
 1644  *                      Resets some OSL controller stats.
 1645  *
 1646  * Input:               None
 1647  * Output:              None
 1648  * Return value:        None
 1649  */
 1650 TW_VOID
 1651 twa_reset_stats(TW_VOID)
 1652 {
 1653         struct twa_softc        *sc;
 1654         TW_INT32                i;
 1655 
 1656         for (i = 0; (sc = devclass_get_softc(twa_devclass, i)) != NULL; i++) {
 1657                 sc->q_stats[TW_OSLI_FREE_Q].max_len = 0;
 1658                 sc->q_stats[TW_OSLI_BUSY_Q].max_len = 0;
 1659                 tw_cl_reset_stats(&sc->ctlr_handle);
 1660         }
 1661 }
 1662 
 1663 #endif /* TW_OSL_DEBUG */

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