FreeBSD/Linux Kernel Cross Reference
sys/dev/altera/sdcard/altera_sdcard_disk.c

     /*-
      * Copyright (c) 2012 Robert N. M. Watson
      * All rights reserved.
      *
      * This software was developed by SRI International and the University of
      * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
      * ("CTSRD"), as part of the DARPA CRASH research programme.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/condvar.h>
    #include <sys/conf.h>
    #include <sys/bio.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <sys/mutex.h>
    #include <sys/rman.h>
    #include <sys/systm.h>
    #include <sys/taskqueue.h>
    
    #include <machine/bus.h>
    #include <machine/resource.h>
    
    #include <geom/geom_disk.h>
    
    #include <dev/altera/sdcard/altera_sdcard.h>
    
    static int
    altera_sdcard_disk_dump(void *arg, void *virtual, vm_offset_t physical,
        off_t offset, size_t length)
    {
    
            panic("%s: not yet", __func__);
    }
    
    static int
    altera_sdcard_disk_ioctl(struct disk *disk, u_long cmd, void *data, int fflag,
        struct thread *td)
    {
    
            /* XXXRW: more here? */
            return (EINVAL);
    }
    
    static void
    altera_sdcard_disk_strategy(struct bio *bp)
    {
            struct altera_sdcard_softc *sc;
    
            /*
             * Although the SD Card doesn't need sorting, we don't want to
             * introduce barriers, so use bioq_disksort().
             */
            sc = bp->bio_disk->d_drv1;
            ALTERA_SDCARD_LOCK(sc);
            switch (sc->as_state) {
            case ALTERA_SDCARD_STATE_NOCARD:
                    device_printf(sc->as_dev, "%s: unexpected I/O on NOCARD",
                        __func__);
                    biofinish(bp, NULL, ENXIO);
                    break;
    
            case ALTERA_SDCARD_STATE_BADCARD:
                    device_printf(sc->as_dev, "%s: unexpected I/O on BADCARD",
                        __func__);
                    biofinish(bp, NULL, ENXIO);
                    break;
    
            case ALTERA_SDCARD_STATE_DETACHED:
                    device_printf(sc->as_dev, "%s: unexpected I/O on DETACHED",
                        __func__);
                    biofinish(bp, NULL, ENXIO);
   
           case ALTERA_SDCARD_STATE_IDLE:
                   bioq_disksort(&sc->as_bioq, bp);
                   altera_sdcard_start(sc);
                   break;
   
           case ALTERA_SDCARD_STATE_IO:
                   bioq_disksort(&sc->as_bioq, bp);
                   break;
   
           default:
                   panic("%s: invalid state %d", __func__, sc->as_state);
           }
           ALTERA_SDCARD_UNLOCK(sc);
   }
   
   void
   altera_sdcard_disk_insert(struct altera_sdcard_softc *sc)
   {
           struct disk *disk;
           uint64_t size;
   
           ALTERA_SDCARD_LOCK_ASSERT(sc);
   
           /*
            * Because the disk insertion routine occupies the driver instance's
            * task queue thread, and the disk(9) instance isn't hooked up yet by
            * definition, the only other source of events of concern is a thread
            * initiating driver detach.  That thread has to issue a detach
            * request and await an ACK from the taskqueue thread.  It is
            * therefore safe to drop the lock here.
            */
           ALTERA_SDCARD_UNLOCK(sc);
           disk = disk_alloc();
           disk->d_drv1 = sc;
           disk->d_name = "altera_sdcard";
           disk->d_unit = sc->as_unit;
           disk->d_strategy = altera_sdcard_disk_strategy;
           disk->d_dump = altera_sdcard_disk_dump;
           disk->d_ioctl = altera_sdcard_disk_ioctl;
           disk->d_sectorsize = ALTERA_SDCARD_SECTORSIZE;
           disk->d_mediasize = sc->as_mediasize;
           disk->d_maxsize = ALTERA_SDCARD_SECTORSIZE;
           sc->as_disk = disk;
           disk_create(disk, DISK_VERSION);
           ALTERA_SDCARD_LOCK(sc);
   
           /*
            * Print a pretty-ish card insertion string.  We could stand to
            * decorate this further, e.g., with card vendor information.
            */
           size = sc->as_mediasize / (1000 * 1000);
           device_printf(sc->as_dev, "%juM SD Card inserted\n", (uintmax_t)size);
   }
   
   void
   altera_sdcard_disk_remove(struct altera_sdcard_softc *sc)
   {
           struct disk *disk;
   
           ALTERA_SDCARD_LOCK_ASSERT(sc);
           KASSERT(sc->as_disk != NULL, ("%s: as_disk NULL", __func__));
   
           /*
            * sc->as_state will be updated by the caller.
            *
            * XXXRW: Is it OK to call disk_destroy() under the mutex, or should
            * we be deferring that to the calling context once it is released?
            */
           disk = sc->as_disk;
           disk_gone(disk);
           disk_destroy(disk);
           sc->as_disk = NULL;
   
           /*
            * Cancel all outstanding I/O on the SD Card.
            */
           if (sc->as_currentbio != NULL) {
                   device_printf(sc->as_dev, "%s: SD Card removed during I/O",
                       __func__);
                   biofinish(sc->as_currentbio, NULL, ENXIO);
                   sc->as_currentbio = NULL;
           }
           bioq_flush(&sc->as_bioq, NULL, ENXIO);
           device_printf(sc->as_dev, "SD Card removed\n");
   }

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