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0b7ed341e1
Previously the "struct disk" were owned by the device driver and this gave us problems when the device disappared and the users of that device were not immediately disappearing. Now the struct disk is allocate with a new call, disk_alloc() and owned by geom_disk and just abandonned by the device driver when disk_create() is called. Unfortunately, this results in a ton of "s/\./->/" changes to device drivers. Since I'm doing the sweep anyway, a couple of other API improvements have been carried out at the same time: The Giant awareness flag has been flipped from DISKFLAG_NOGIANT to DISKFLAG_NEEDSGIANT A version number have been added to disk_create() so that we can detect, report and ignore binary drivers with old ABI in the future. Manual page update to follow shortly.
221 lines
5.3 KiB
C
221 lines
5.3 KiB
C
/*
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* Copyright (C) 2002 Benno Rice <benno@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <geom/geom_disk.h>
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#include <dev/ofw/openfirm.h>
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#include <machine/bus.h>
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#include <machine/md_var.h>
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#include <machine/nexusvar.h>
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#define OFWD_BLOCKSIZE 512
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struct ofwd_softc
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{
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device_t ofwd_dev;
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struct disk *ofwd_disk;
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phandle_t ofwd_package;
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ihandle_t ofwd_instance;
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};
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/*
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* Disk device bus interface.
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*/
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static void ofwd_identify(driver_t *, device_t);
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static int ofwd_probe(device_t);
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static int ofwd_attach(device_t);
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static device_method_t ofwd_methods[] = {
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DEVMETHOD(device_identify, ofwd_identify),
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DEVMETHOD(device_probe, ofwd_probe),
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DEVMETHOD(device_attach, ofwd_attach),
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{ 0, 0 }
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};
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static driver_t ofwd_driver = {
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"ofwd",
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ofwd_methods,
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sizeof(struct ofwd_softc)
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};
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static devclass_t ofwd_devclass;
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DRIVER_MODULE(ofwd, nexus, ofwd_driver, ofwd_devclass, 0, 0);
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/*
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* Disk device control interface.
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*/
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static disk_strategy_t ofwd_strategy;
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/*
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* Handle an I/O request.
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*/
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static void
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ofwd_strategy(struct bio *bp)
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{
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struct ofwd_softc *sc;
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long r;
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sc = (struct ofwd_softc *)bp->bio_disk->d_drv1;
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if (sc == NULL) {
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printf("ofwd: bio for invalid disk!\n");
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biofinish(bp, NULL, EINVAL);
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return;
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}
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r = OF_seek(sc->ofwd_instance, bp->bio_offset);
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if (r == -1) {
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bp->bio_resid = bp->bio_bcount;
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device_printf(sc->ofwd_dev, "seek failed\n");
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biofinish(bp, NULL, EIO);
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return;
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}
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if (bp->bio_cmd == BIO_READ) {
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r = OF_read(sc->ofwd_instance, (void *)bp->bio_data,
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bp->bio_bcount);
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} else {
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r = OF_write(sc->ofwd_instance, (void *)bp->bio_data,
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bp->bio_bcount);
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}
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if (r > bp->bio_bcount)
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panic("ofwd: more bytes read/written than requested");
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if (r == -1) {
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device_printf(sc->ofwd_dev, "r (%ld) < bp->bio_bcount (%ld)\n",
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r, bp->bio_bcount);
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biofinish(bp, NULL, EIO);
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return;
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}
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bp->bio_resid -= r;
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if (r < bp->bio_bcount) {
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device_printf(sc->ofwd_dev, "r (%ld) < bp->bio_bcount (%ld)\n",
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r, bp->bio_bcount);
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biofinish(bp, NULL, EIO); /* XXX: probably not an error */
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return;
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}
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biodone(bp);
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return;
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}
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/*
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* Attach the OpenFirmware disk to nexus if present
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*/
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static void
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ofwd_identify(driver_t *driver, device_t parent)
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{
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device_t child;
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phandle_t ofd;
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static char type[8];
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ofd = OF_finddevice("ofwdisk");
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if (ofd == -1)
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return;
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OF_getprop(ofd, "device_type", type, sizeof(type));
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child = BUS_ADD_CHILD(parent, INT_MAX, "ofwd", 0);
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if (child != NULL) {
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nexus_set_device_type(child, type);
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nexus_set_node(child, ofd);
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}
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}
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/*
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* Probe for an OpenFirmware disk.
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*/
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static int
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ofwd_probe(device_t dev)
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{
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char *type;
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char fname[32];
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phandle_t node;
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type = nexus_get_device_type(dev);
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node = nexus_get_node(dev);
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if (type == NULL ||
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(strcmp(type, "disk") != 0 && strcmp(type, "block") != 0))
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return (ENXIO);
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if (OF_getprop(node, "file", fname, sizeof(fname)) == -1)
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return (ENXIO);
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device_set_desc(dev, "OpenFirmware disk");
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return (0);
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}
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static int
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ofwd_attach(device_t dev)
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{
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struct ofwd_softc *sc;
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char path[128];
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char fname[32];
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sc = device_get_softc(dev);
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sc->ofwd_dev = dev;
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bzero(path, 128);
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OF_package_to_path(nexus_get_node(dev), path, 128);
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OF_getprop(nexus_get_node(dev), "file", fname, sizeof(fname));
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device_printf(dev, "located at %s, file %s\n", path, fname);
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sc->ofwd_instance = OF_open(path);
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if (sc->ofwd_instance == -1) {
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device_printf(dev, "could not create instance\n");
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return (ENXIO);
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}
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sc->ofwd_disk = disk_alloc();
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sc->ofwd_disk->d_strategy = ofwd_strategy;
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sc->ofwd_disk->d_name = "ofwd";
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sc->ofwd_disk->d_sectorsize = OFWD_BLOCKSIZE;
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sc->ofwd_disk->d_mediasize = (off_t)33554432 * OFWD_BLOCKSIZE;
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sc->ofwd_disk->d_fwsectors = 0;
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sc->ofwd_disk->d_fwheads = 0;
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sc->ofwd_disk->d_drv1 = sc;
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sc->ofwd_disk->d_maxsize = PAGE_SIZE;
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sc->ofwd_disk->d_unit = device_get_unit(dev);
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sc->ofwd_disk->d_flags = DISKFLAG_NEEDSGIANT;
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disk_create(sc->ofwd_disk, DISK_VERSION);
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return (0);
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}
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