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/aac/aac_disk.c

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    1 /*-
    2  * Copyright (c) 2000 Michael Smith
    3  * Copyright (c) 2001 Scott Long
    4  * Copyright (c) 2000 BSDi
    5  * Copyright (c) 2001 Adaptec, Inc.
    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 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include "opt_aac.h"
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/kernel.h>
   38 #include <sys/module.h>
   39 #include <sys/sysctl.h>
   40 
   41 #include <sys/bus.h>
   42 #include <sys/conf.h>
   43 #include <sys/disk.h>
   44 
   45 #include <vm/vm.h>
   46 #include <vm/pmap.h>
   47 
   48 #include <machine/md_var.h>
   49 #include <machine/bus.h>
   50 #include <sys/rman.h>
   51 
   52 #include <dev/aac/aacreg.h>
   53 #include <sys/aac_ioctl.h>
   54 #include <dev/aac/aacvar.h>
   55 
   56 /*
   57  * Interface to parent.
   58  */
   59 static int aac_disk_probe(device_t dev);
   60 static int aac_disk_attach(device_t dev);
   61 static int aac_disk_detach(device_t dev);
   62 
   63 /*
   64  * Interface to the device switch.
   65  */
   66 static  disk_open_t     aac_disk_open;
   67 static  disk_close_t    aac_disk_close;
   68 static  disk_strategy_t aac_disk_strategy;
   69 static  dumper_t        aac_disk_dump;
   70 
   71 static devclass_t       aac_disk_devclass;
   72 
   73 static device_method_t aac_disk_methods[] = {
   74         DEVMETHOD(device_probe, aac_disk_probe),
   75         DEVMETHOD(device_attach,        aac_disk_attach),
   76         DEVMETHOD(device_detach,        aac_disk_detach),
   77         { 0, 0 }
   78 };
   79 
   80 static driver_t aac_disk_driver = {
   81         "aacd",
   82         aac_disk_methods,
   83         sizeof(struct aac_disk)
   84 };
   85 
   86 #define AAC_MAXIO       65536
   87 
   88 DRIVER_MODULE(aacd, aac, aac_disk_driver, aac_disk_devclass, 0, 0);
   89 
   90 /* sysctl tunables */
   91 static unsigned int aac_iosize_max = AAC_MAXIO; /* due to limits of the card */
   92 TUNABLE_INT("hw.aac.iosize_max", &aac_iosize_max);
   93 
   94 SYSCTL_DECL(_hw_aac);
   95 SYSCTL_UINT(_hw_aac, OID_AUTO, iosize_max, CTLFLAG_RDTUN, &aac_iosize_max, 0,
   96             "Max I/O size per transfer to an array");
   97 
   98 /*
   99  * Handle open from generic layer.
  100  *
  101  * This is called by the diskslice code on first open in order to get the 
  102  * basic device geometry paramters.
  103  */
  104 static int
  105 aac_disk_open(struct disk *dp)
  106 {
  107         struct aac_disk *sc;
  108 
  109         fwprintf(NULL, HBA_FLAGS_DBG_FUNCTION_ENTRY_B, "");
  110 
  111         sc = (struct aac_disk *)dp->d_drv1;
  112         
  113         if (sc == NULL) {
  114                 printf("aac_disk_open: No Softc\n");
  115                 return (ENXIO);
  116         }
  117 
  118         /* check that the controller is up and running */
  119         if (sc->ad_controller->aac_state & AAC_STATE_SUSPEND) {
  120                 printf("Controller Suspended controller state = 0x%x\n",
  121                        sc->ad_controller->aac_state);
  122                 return(ENXIO);
  123         }
  124 
  125         sc->ad_flags |= AAC_DISK_OPEN;
  126         return (0);
  127 }
  128 
  129 /*
  130  * Handle last close of the disk device.
  131  */
  132 static int
  133 aac_disk_close(struct disk *dp)
  134 {
  135         struct aac_disk *sc;
  136 
  137         fwprintf(NULL, HBA_FLAGS_DBG_FUNCTION_ENTRY_B, "");
  138 
  139         sc = (struct aac_disk *)dp->d_drv1;
  140         
  141         if (sc == NULL)
  142                 return (ENXIO);
  143 
  144         sc->ad_flags &= ~AAC_DISK_OPEN;
  145         return (0);
  146 }
  147 
  148 /*
  149  * Handle an I/O request.
  150  */
  151 static void
  152 aac_disk_strategy(struct bio *bp)
  153 {
  154         struct aac_disk *sc;
  155 
  156         sc = (struct aac_disk *)bp->bio_disk->d_drv1;
  157         fwprintf(NULL, HBA_FLAGS_DBG_FUNCTION_ENTRY_B, "");
  158 
  159         /* bogus disk? */
  160         if (sc == NULL) {
  161                 bp->bio_flags |= BIO_ERROR;
  162                 bp->bio_error = EINVAL;
  163                 biodone(bp);
  164                 return;
  165         }
  166 
  167         /* do-nothing operation? */
  168         if (bp->bio_bcount == 0) {
  169                 bp->bio_resid = bp->bio_bcount;
  170                 biodone(bp);
  171                 return;
  172         }
  173 
  174         /* perform accounting */
  175 
  176         /* pass the bio to the controller - it can work out who we are */
  177         mtx_lock(&sc->ad_controller->aac_io_lock);
  178         aac_submit_bio(bp);
  179         mtx_unlock(&sc->ad_controller->aac_io_lock);
  180 
  181         return;
  182 }
  183 
  184 /*
  185  * Map the S/G elements for doing a dump.
  186  */
  187 static void
  188 aac_dump_map_sg(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
  189 {
  190         struct aac_fib *fib;
  191         struct aac_blockwrite *bw;
  192         struct aac_sg_table *sg;
  193         int i;
  194 
  195         fib = (struct aac_fib *)arg;
  196         bw = (struct aac_blockwrite *)&fib->data[0];
  197         sg = &bw->SgMap;
  198 
  199         if (sg != NULL) {
  200                 sg->SgCount = nsegs;
  201                 for (i = 0; i < nsegs; i++) {
  202                         if (segs[i].ds_addr >= BUS_SPACE_MAXADDR_32BIT)
  203                                 return;
  204                         sg->SgEntry[i].SgAddress = segs[i].ds_addr;
  205                         sg->SgEntry[i].SgByteCount = segs[i].ds_len;
  206                 }
  207                 fib->Header.Size = nsegs * sizeof(struct aac_sg_entry);
  208         }
  209 }
  210 
  211 /*
  212  * Map the S/G elements for doing a dump on 64-bit capable devices.
  213  */
  214 static void
  215 aac_dump_map_sg64(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
  216 {
  217         struct aac_fib *fib;
  218         struct aac_blockwrite64 *bw;
  219         struct aac_sg_table64 *sg;
  220         int i;
  221 
  222         fib = (struct aac_fib *)arg;
  223         bw = (struct aac_blockwrite64 *)&fib->data[0];
  224         sg = &bw->SgMap64;
  225 
  226         if (sg != NULL) {
  227                 sg->SgCount = nsegs;
  228                 for (i = 0; i < nsegs; i++) {
  229                         sg->SgEntry64[i].SgAddress = segs[i].ds_addr;
  230                         sg->SgEntry64[i].SgByteCount = segs[i].ds_len;
  231                 }
  232                 fib->Header.Size = nsegs * sizeof(struct aac_sg_entry64);
  233         }
  234 }
  235 
  236 /*
  237  * Dump memory out to an array
  238  *
  239  * Send out one command at a time with up to AAC_MAXIO of data.
  240  */
  241 static int
  242 aac_disk_dump(void *arg, void *virtual, vm_offset_t physical, off_t offset, size_t length)
  243 {
  244         struct aac_disk *ad;
  245         struct aac_softc *sc;
  246         struct aac_fib *fib;
  247         size_t len;
  248         int size;
  249         static bus_dmamap_t dump_datamap;
  250         static int first = 0;
  251         struct disk *dp;
  252         bus_dmamap_callback_t *callback;
  253         u_int32_t command;
  254 
  255         dp = arg;
  256         ad = dp->d_drv1;
  257 
  258         if (ad == NULL)
  259                 return (EINVAL);
  260 
  261         sc= ad->ad_controller;
  262 
  263         if (!first) {
  264                 first = 1;
  265                 if (bus_dmamap_create(sc->aac_buffer_dmat, 0, &dump_datamap)) {
  266                         printf("bus_dmamap_create failed\n");
  267                         return (ENOMEM);
  268                 }
  269         }
  270 
  271         /* Skip aac_alloc_sync_fib().  We don't want to mess with sleep locks */
  272         fib = &sc->aac_common->ac_sync_fib;
  273 
  274         while (length > 0) {
  275                 len = (length > AAC_MAXIO) ? AAC_MAXIO : length;
  276                 if ((sc->flags & AAC_FLAGS_SG_64BIT) == 0) {
  277                         struct aac_blockwrite *bw;
  278                         bw = (struct aac_blockwrite *)&fib->data[0];
  279                         bw->Command = VM_CtBlockWrite;
  280                         bw->ContainerId = ad->ad_container->co_mntobj.ObjectId;
  281                         bw->BlockNumber = offset / AAC_BLOCK_SIZE;
  282                         bw->ByteCount = len;
  283                         bw->Stable = CUNSTABLE;
  284                         command = ContainerCommand;
  285                         callback = aac_dump_map_sg;
  286                         size = sizeof(struct aac_blockwrite);
  287                 } else {
  288                         struct aac_blockwrite64 *bw;
  289                         bw = (struct aac_blockwrite64 *)&fib->data[0];
  290                         bw->Command = VM_CtHostWrite64;
  291                         bw->ContainerId = ad->ad_container->co_mntobj.ObjectId;
  292                         bw->BlockNumber = offset / AAC_BLOCK_SIZE;
  293                         bw->SectorCount = len / AAC_BLOCK_SIZE;
  294                         bw->Pad = 0;
  295                         bw->Flags = 0;
  296                         command = ContainerCommand64;
  297                         callback = aac_dump_map_sg64;
  298                         size = sizeof(struct aac_blockwrite64);
  299                 }
  300 
  301                 /*
  302                  * There really isn't any way to recover from errors or
  303                  * resource shortages here.  Oh well.  Because of that, don't
  304                  * bother trying to send the command from the callback; there
  305                  * is too much required context.
  306                  */
  307                 if (bus_dmamap_load(sc->aac_buffer_dmat, dump_datamap, virtual,
  308                     len, callback, fib, BUS_DMA_NOWAIT) != 0)
  309                         return (ENOMEM);
  310 
  311                 bus_dmamap_sync(sc->aac_buffer_dmat, dump_datamap,
  312                     BUS_DMASYNC_PREWRITE);
  313 
  314                 /* fib->Header.Size is set in aac_dump_map_sg */
  315                 size += fib->Header.Size;
  316 
  317                 if (aac_sync_fib(sc, command, 0, fib, size)) {
  318                         printf("Error dumping block 0x%jx\n",
  319                                (uintmax_t)physical);
  320                         return (EIO);
  321                 }
  322 
  323                 bus_dmamap_sync(sc->aac_buffer_dmat, dump_datamap,
  324                     BUS_DMASYNC_POSTWRITE);
  325 
  326                 bus_dmamap_unload(sc->aac_buffer_dmat, dump_datamap);
  327 
  328                 length -= len;
  329                 offset += len;
  330                 virtual = (uint8_t *)virtual + len;
  331         }
  332 
  333         return (0);
  334 }
  335 
  336 /*
  337  * Handle completion of an I/O request.
  338  */
  339 void
  340 aac_biodone(struct bio *bp)
  341 {
  342         struct aac_disk *sc;
  343 
  344         sc = (struct aac_disk *)bp->bio_disk->d_drv1;
  345         fwprintf(NULL, HBA_FLAGS_DBG_FUNCTION_ENTRY_B, "");
  346 
  347         if (bp->bio_flags & BIO_ERROR)
  348                 disk_err(bp, "hard error", -1, 1);
  349 
  350         biodone(bp);
  351 }
  352 
  353 /*
  354  * Stub only.
  355  */
  356 static int
  357 aac_disk_probe(device_t dev)
  358 {
  359 
  360         fwprintf(NULL, HBA_FLAGS_DBG_FUNCTION_ENTRY_B, "");
  361 
  362         return (0);
  363 }
  364 
  365 /*
  366  * Attach a unit to the controller.
  367  */
  368 static int
  369 aac_disk_attach(device_t dev)
  370 {
  371         struct aac_disk *sc;
  372         
  373         sc = (struct aac_disk *)device_get_softc(dev);
  374         fwprintf(NULL, HBA_FLAGS_DBG_FUNCTION_ENTRY_B, "");
  375 
  376         /* initialise our softc */
  377         sc->ad_controller =
  378             (struct aac_softc *)device_get_softc(device_get_parent(dev));
  379         sc->ad_container = device_get_ivars(dev);
  380         sc->ad_dev = dev;
  381 
  382         /*
  383          * require that extended translation be enabled - other drivers read the
  384          * disk!
  385          */
  386         sc->ad_size = sc->ad_container->co_mntobj.Capacity;
  387         if (sc->ad_controller->flags & AAC_FLAGS_LBA_64BIT)
  388                 sc->ad_size += (u_int64_t)
  389                         sc->ad_container->co_mntobj.CapacityHigh << 32;
  390         if (sc->ad_size >= (2 * 1024 * 1024)) {         /* 2GB */
  391                 sc->ad_heads = 255;
  392                 sc->ad_sectors = 63;
  393         } else if (sc->ad_size >= (1 * 1024 * 1024)) {  /* 1GB */
  394                 sc->ad_heads = 128;
  395                 sc->ad_sectors = 32;
  396         } else {
  397                 sc->ad_heads = 64;
  398                 sc->ad_sectors = 32;
  399         }
  400         sc->ad_cylinders = (sc->ad_size / (sc->ad_heads * sc->ad_sectors));
  401 
  402         device_printf(dev, "%juMB (%ju sectors)\n",
  403                       (intmax_t)sc->ad_size / ((1024 * 1024) / AAC_BLOCK_SIZE),
  404                       (intmax_t)sc->ad_size);
  405 
  406         /* attach a generic disk device to ourselves */
  407         sc->unit = device_get_unit(dev);
  408         sc->ad_disk = disk_alloc();
  409         sc->ad_disk->d_drv1 = sc;
  410         sc->ad_disk->d_name = "aacd";
  411         sc->ad_disk->d_maxsize = aac_iosize_max;
  412         sc->ad_disk->d_open = aac_disk_open;
  413         sc->ad_disk->d_close = aac_disk_close;
  414         sc->ad_disk->d_strategy = aac_disk_strategy;
  415         sc->ad_disk->d_dump = aac_disk_dump;
  416         sc->ad_disk->d_sectorsize = AAC_BLOCK_SIZE;
  417         sc->ad_disk->d_mediasize = (off_t)sc->ad_size * AAC_BLOCK_SIZE;
  418         sc->ad_disk->d_fwsectors = sc->ad_sectors;
  419         sc->ad_disk->d_fwheads = sc->ad_heads;
  420         sc->ad_disk->d_unit = sc->unit;
  421         disk_create(sc->ad_disk, DISK_VERSION);
  422 
  423         return (0);
  424 }
  425 
  426 /*
  427  * Disconnect ourselves from the system.
  428  */
  429 static int
  430 aac_disk_detach(device_t dev)
  431 {
  432         struct aac_disk *sc;
  433 
  434         sc = (struct aac_disk *)device_get_softc(dev);
  435         fwprintf(NULL, HBA_FLAGS_DBG_FUNCTION_ENTRY_B, "");
  436 
  437         if (sc->ad_flags & AAC_DISK_OPEN)
  438                 return(EBUSY);
  439 
  440         disk_destroy(sc->ad_disk);
  441 
  442         return(0);
  443 }

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