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/mlx/mlx_disk.c

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    1 /*-
    2  * Copyright (c) 1999 Jonathan Lemon
    3  * Copyright (c) 1999 Michael Smith
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 /*
   33  * Disk driver for Mylex DAC960 RAID adapters.
   34  */
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/kernel.h>
   39 #include <sys/module.h>
   40 
   41 #include <sys/bus.h>
   42 #include <sys/conf.h>
   43 
   44 #include <machine/bus.h>
   45 #include <sys/rman.h>
   46 
   47 #include <geom/geom_disk.h>
   48 
   49 #include <dev/mlx/mlx_compat.h>
   50 #include <dev/mlx/mlxio.h>
   51 #include <dev/mlx/mlxvar.h>
   52 #include <dev/mlx/mlxreg.h>
   53 
   54 /* prototypes */
   55 static int mlxd_probe(device_t dev);
   56 static int mlxd_attach(device_t dev);
   57 static int mlxd_detach(device_t dev);
   58 
   59 devclass_t              mlxd_devclass;
   60 
   61 static device_method_t mlxd_methods[] = {
   62     DEVMETHOD(device_probe,     mlxd_probe),
   63     DEVMETHOD(device_attach,    mlxd_attach),
   64     DEVMETHOD(device_detach,    mlxd_detach),
   65     { 0, 0 }
   66 };
   67 
   68 static driver_t mlxd_driver = {
   69     "mlxd",
   70     mlxd_methods,
   71     sizeof(struct mlxd_softc)
   72 };
   73 
   74 DRIVER_MODULE(mlxd, mlx, mlxd_driver, mlxd_devclass, 0, 0);
   75 
   76 static int
   77 mlxd_open(struct disk *dp)
   78 {
   79     struct mlxd_softc   *sc = (struct mlxd_softc *)dp->d_drv1;
   80 
   81     debug_called(1);
   82         
   83     if (sc == NULL)
   84         return (ENXIO);
   85 
   86     /* controller not active? */
   87     if (sc->mlxd_controller->mlx_state & MLX_STATE_SHUTDOWN)
   88         return(ENXIO);
   89 
   90     sc->mlxd_flags |= MLXD_OPEN;
   91     return (0);
   92 }
   93 
   94 static int
   95 mlxd_close(struct disk *dp)
   96 {
   97     struct mlxd_softc   *sc = (struct mlxd_softc *)dp->d_drv1;
   98 
   99     debug_called(1);
  100         
  101     if (sc == NULL)
  102         return (ENXIO);
  103     sc->mlxd_flags &= ~MLXD_OPEN;
  104     return (0);
  105 }
  106 
  107 static int
  108 mlxd_ioctl(struct disk *dp, u_long cmd, void *addr, int flag, struct thread *td)
  109 {
  110     struct mlxd_softc   *sc = (struct mlxd_softc *)dp->d_drv1;
  111     int error;
  112 
  113     debug_called(1);
  114         
  115     if (sc == NULL)
  116         return (ENXIO);
  117 
  118     if ((error = mlx_submit_ioctl(sc->mlxd_controller, sc->mlxd_drive, cmd, addr, flag, td)) != ENOIOCTL) {
  119         debug(0, "mlx_submit_ioctl returned %d\n", error);
  120         return(error);
  121     }
  122     return (ENOTTY);
  123 }
  124 
  125 /*
  126  * Read/write routine for a buffer.  Finds the proper unit, range checks
  127  * arguments, and schedules the transfer.  Does not wait for the transfer
  128  * to complete.  Multi-page transfers are supported.  All I/O requests must
  129  * be a multiple of a sector in length.
  130  */
  131 static void
  132 mlxd_strategy(mlx_bio *bp)
  133 {
  134     struct mlxd_softc   *sc = (struct mlxd_softc *)MLX_BIO_SOFTC(bp);
  135 
  136     debug_called(1);
  137 
  138     /* bogus disk? */
  139     if (sc == NULL) {
  140         MLX_BIO_SET_ERROR(bp, EINVAL);
  141         goto bad;
  142     }
  143 
  144     /* XXX may only be temporarily offline - sleep? */
  145     if (sc->mlxd_drive->ms_state == MLX_SYSD_OFFLINE) {
  146         MLX_BIO_SET_ERROR(bp, ENXIO);
  147         goto bad;
  148     }
  149 
  150     MLX_BIO_STATS_START(bp);
  151     mlx_submit_buf(sc->mlxd_controller, bp);
  152     return;
  153 
  154  bad:
  155     /*
  156      * Correctly set the bio to indicate a failed tranfer.
  157      */
  158     MLX_BIO_RESID(bp) = MLX_BIO_LENGTH(bp);
  159     MLX_BIO_DONE(bp);
  160     return;
  161 }
  162 
  163 void
  164 mlxd_intr(void *data)
  165 {
  166     mlx_bio             *bp = (mlx_bio *)data;
  167 
  168     debug_called(1);
  169         
  170     if (MLX_BIO_HAS_ERROR(bp))
  171         MLX_BIO_SET_ERROR(bp, EIO);
  172     else
  173         MLX_BIO_RESID(bp) = 0;
  174 
  175     MLX_BIO_STATS_END(bp);
  176     MLX_BIO_DONE(bp);
  177 }
  178 
  179 static int
  180 mlxd_probe(device_t dev)
  181 {
  182 
  183     debug_called(1);
  184         
  185     device_set_desc(dev, "Mylex System Drive");
  186     return (0);
  187 }
  188 
  189 static int
  190 mlxd_attach(device_t dev)
  191 {
  192     struct mlxd_softc   *sc = (struct mlxd_softc *)device_get_softc(dev);
  193     device_t            parent;
  194     char                *state;
  195     int                 s1, s2;
  196     
  197     debug_called(1);
  198 
  199     parent = device_get_parent(dev);
  200     sc->mlxd_controller = (struct mlx_softc *)device_get_softc(parent);
  201     sc->mlxd_unit = device_get_unit(dev);
  202     sc->mlxd_drive = device_get_ivars(dev);
  203     sc->mlxd_dev = dev;
  204 
  205     switch(sc->mlxd_drive->ms_state) {
  206     case MLX_SYSD_ONLINE:
  207         state = "online";
  208         break;
  209     case MLX_SYSD_CRITICAL:
  210         state = "critical";
  211         break;
  212     case MLX_SYSD_OFFLINE:
  213         state = "offline";
  214         break;
  215     default:
  216         state = "unknown state";
  217     }
  218 
  219     device_printf(dev, "%uMB (%u sectors) RAID %d (%s)\n",
  220                   sc->mlxd_drive->ms_size / ((1024 * 1024) / MLX_BLKSIZE),
  221                   sc->mlxd_drive->ms_size, sc->mlxd_drive->ms_raidlevel, state);
  222 
  223     sc->mlxd_disk = disk_alloc();
  224     sc->mlxd_disk->d_open = mlxd_open;
  225     sc->mlxd_disk->d_close = mlxd_close;
  226     sc->mlxd_disk->d_ioctl = mlxd_ioctl;
  227     sc->mlxd_disk->d_strategy = mlxd_strategy;
  228     sc->mlxd_disk->d_name = "mlxd";
  229     sc->mlxd_disk->d_unit = sc->mlxd_unit;
  230     sc->mlxd_disk->d_drv1 = sc;
  231     sc->mlxd_disk->d_sectorsize = MLX_BLKSIZE;
  232     sc->mlxd_disk->d_mediasize = MLX_BLKSIZE * (off_t)sc->mlxd_drive->ms_size;
  233     sc->mlxd_disk->d_fwsectors = sc->mlxd_drive->ms_sectors;
  234     sc->mlxd_disk->d_fwheads = sc->mlxd_drive->ms_heads;
  235     sc->mlxd_disk->d_flags = DISKFLAG_NEEDSGIANT;
  236 
  237     /* 
  238      * Set maximum I/O size to the lesser of the recommended maximum and the practical
  239      * maximum except on v2 cards where the maximum is set to 8 pages.
  240      */
  241     if (sc->mlxd_controller->mlx_iftype == MLX_IFTYPE_2)
  242         sc->mlxd_disk->d_maxsize = 8 * PAGE_SIZE;
  243     else {
  244         s1 = sc->mlxd_controller->mlx_enq2->me_maxblk * MLX_BLKSIZE;
  245         s2 = (sc->mlxd_controller->mlx_enq2->me_max_sg - 1) * PAGE_SIZE;
  246         sc->mlxd_disk->d_maxsize = imin(s1, s2);
  247     }
  248 
  249     disk_create(sc->mlxd_disk, DISK_VERSION);
  250 
  251     return (0);
  252 }
  253 
  254 static int
  255 mlxd_detach(device_t dev)
  256 {
  257     struct mlxd_softc *sc = (struct mlxd_softc *)device_get_softc(dev);
  258 
  259     debug_called(1);
  260 
  261     disk_destroy(sc->mlxd_disk);
  262 
  263     return(0);
  264 }
  265 

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