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/altera/sdcard/altera_sdcard_disk.c

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    1 /*-
    2  * Copyright (c) 2012 Robert N. M. Watson
    3  * All rights reserved.
    4  *
    5  * This software was developed by SRI International and the University of
    6  * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
    7  * ("CTSRD"), as part of the DARPA CRASH research programme.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: releng/10.0/sys/dev/altera/sdcard/altera_sdcard_disk.c 239675 2012-08-25 11:19:20Z rwatson $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/bus.h>
   36 #include <sys/condvar.h>
   37 #include <sys/conf.h>
   38 #include <sys/bio.h>
   39 #include <sys/kernel.h>
   40 #include <sys/lock.h>
   41 #include <sys/malloc.h>
   42 #include <sys/module.h>
   43 #include <sys/mutex.h>
   44 #include <sys/rman.h>
   45 #include <sys/systm.h>
   46 #include <sys/taskqueue.h>
   47 
   48 #include <machine/bus.h>
   49 #include <machine/resource.h>
   50 
   51 #include <geom/geom_disk.h>
   52 
   53 #include <dev/altera/sdcard/altera_sdcard.h>
   54 
   55 static int
   56 altera_sdcard_disk_dump(void *arg, void *virtual, vm_offset_t physical,
   57     off_t offset, size_t length)
   58 {
   59 
   60         panic("%s: not yet", __func__);
   61 }
   62 
   63 static int
   64 altera_sdcard_disk_ioctl(struct disk *disk, u_long cmd, void *data, int fflag,
   65     struct thread *td)
   66 {
   67 
   68         /* XXXRW: more here? */
   69         return (EINVAL);
   70 }
   71 
   72 static void
   73 altera_sdcard_disk_strategy(struct bio *bp)
   74 {
   75         struct altera_sdcard_softc *sc;
   76 
   77         /*
   78          * Although the SD Card doesn't need sorting, we don't want to
   79          * introduce barriers, so use bioq_disksort().
   80          */
   81         sc = bp->bio_disk->d_drv1;
   82         ALTERA_SDCARD_LOCK(sc);
   83         switch (sc->as_state) {
   84         case ALTERA_SDCARD_STATE_NOCARD:
   85                 device_printf(sc->as_dev, "%s: unexpected I/O on NOCARD",
   86                     __func__);
   87                 biofinish(bp, NULL, ENXIO);
   88                 break;
   89 
   90         case ALTERA_SDCARD_STATE_BADCARD:
   91                 device_printf(sc->as_dev, "%s: unexpected I/O on BADCARD",
   92                     __func__);
   93                 biofinish(bp, NULL, ENXIO);
   94                 break;
   95 
   96         case ALTERA_SDCARD_STATE_DETACHED:
   97                 device_printf(sc->as_dev, "%s: unexpected I/O on DETACHED",
   98                     __func__);
   99                 biofinish(bp, NULL, ENXIO);
  100 
  101         case ALTERA_SDCARD_STATE_IDLE:
  102                 bioq_disksort(&sc->as_bioq, bp);
  103                 altera_sdcard_start(sc);
  104                 break;
  105 
  106         case ALTERA_SDCARD_STATE_IO:
  107                 bioq_disksort(&sc->as_bioq, bp);
  108                 break;
  109 
  110         default:
  111                 panic("%s: invalid state %d", __func__, sc->as_state);
  112         }
  113         ALTERA_SDCARD_UNLOCK(sc);
  114 }
  115 
  116 void
  117 altera_sdcard_disk_insert(struct altera_sdcard_softc *sc)
  118 {
  119         struct disk *disk;
  120         uint64_t size;
  121 
  122         ALTERA_SDCARD_LOCK_ASSERT(sc);
  123 
  124         /*
  125          * Because the disk insertion routine occupies the driver instance's
  126          * task queue thread, and the disk(9) instance isn't hooked up yet by
  127          * definition, the only other source of events of concern is a thread
  128          * initiating driver detach.  That thread has to issue a detach
  129          * request and await an ACK from the taskqueue thread.  It is
  130          * therefore safe to drop the lock here.
  131          */
  132         ALTERA_SDCARD_UNLOCK(sc);
  133         disk = disk_alloc();
  134         disk->d_drv1 = sc;
  135         disk->d_name = "altera_sdcard";
  136         disk->d_unit = sc->as_unit;
  137         disk->d_strategy = altera_sdcard_disk_strategy;
  138         disk->d_dump = altera_sdcard_disk_dump;
  139         disk->d_ioctl = altera_sdcard_disk_ioctl;
  140         disk->d_sectorsize = ALTERA_SDCARD_SECTORSIZE;
  141         disk->d_mediasize = sc->as_mediasize;
  142         disk->d_maxsize = ALTERA_SDCARD_SECTORSIZE;
  143         sc->as_disk = disk;
  144         disk_create(disk, DISK_VERSION);
  145         ALTERA_SDCARD_LOCK(sc);
  146 
  147         /*
  148          * Print a pretty-ish card insertion string.  We could stand to
  149          * decorate this further, e.g., with card vendor information.
  150          */
  151         size = sc->as_mediasize / (1000 * 1000);
  152         device_printf(sc->as_dev, "%juM SD Card inserted\n", (uintmax_t)size);
  153 }
  154 
  155 void
  156 altera_sdcard_disk_remove(struct altera_sdcard_softc *sc)
  157 {
  158         struct disk *disk;
  159 
  160         ALTERA_SDCARD_LOCK_ASSERT(sc);
  161         KASSERT(sc->as_disk != NULL, ("%s: as_disk NULL", __func__));
  162 
  163         /*
  164          * sc->as_state will be updated by the caller.
  165          *
  166          * XXXRW: Is it OK to call disk_destroy() under the mutex, or should
  167          * we be deferring that to the calling context once it is released?
  168          */
  169         disk = sc->as_disk;
  170         disk_gone(disk);
  171         disk_destroy(disk);
  172         sc->as_disk = NULL;
  173 
  174         /*
  175          * Cancel all outstanding I/O on the SD Card.
  176          */
  177         if (sc->as_currentbio != NULL) {
  178                 device_printf(sc->as_dev, "%s: SD Card removed during I/O",
  179                     __func__);
  180                 biofinish(sc->as_currentbio, NULL, ENXIO);
  181                 sc->as_currentbio = NULL;
  182         }
  183         bioq_flush(&sc->as_bioq, NULL, ENXIO);
  184         device_printf(sc->as_dev, "SD Card removed\n");
  185 }

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