360 lines
8.9 KiB
C
360 lines
8.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2009 Sam Leffler, Errno Consulting
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* Copyright (c) 2012-2013, SRI International
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* All rights reserved.
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*
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* Portions of this software were developed by SRI International and the
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* University of Cambridge Computer Laboratory under DARPA/AFRL contract
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* (FA8750-10-C-0237) ("CTSRD"), as part of the DARPA CRASH research
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* programme.
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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 THE AUTHOR ``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 THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/malloc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/module.h>
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#include <sys/rman.h>
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#include <sys/sysctl.h>
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#include <sys/taskqueue.h>
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#include <machine/bus.h>
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#include <dev/cfi/cfi_var.h>
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#include <geom/geom.h>
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#include <geom/geom_disk.h>
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struct cfi_disk_softc {
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struct cfi_softc *parent;
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struct disk *disk;
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int flags;
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#define CFI_DISK_OPEN 0x0001
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struct bio_queue_head bioq; /* bio queue */
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struct mtx qlock; /* bioq lock */
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struct taskqueue *tq; /* private task queue for i/o request */
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struct task iotask; /* i/o processing */
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};
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#define CFI_DISK_SECSIZE 512
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#define CFI_DISK_MAXIOSIZE 65536
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static int cfi_disk_detach(device_t);
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static int cfi_disk_open(struct disk *);
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static int cfi_disk_close(struct disk *);
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static void cfi_io_proc(void *, int);
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static int cfi_disk_getattr(struct bio *);
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static void cfi_disk_strategy(struct bio *);
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static int cfi_disk_ioctl(struct disk *, u_long, void *, int, struct thread *);
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static int
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cfi_disk_probe(device_t dev)
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{
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return 0;
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}
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static int
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cfi_disk_attach(device_t dev)
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{
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struct cfi_disk_softc *sc = device_get_softc(dev);
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sc->parent = device_get_softc(device_get_parent(dev));
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/* validate interface width; assumed by other code */
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if (sc->parent->sc_width != 1 &&
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sc->parent->sc_width != 2 &&
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sc->parent->sc_width != 4)
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return EINVAL;
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sc->disk = disk_alloc();
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if (sc->disk == NULL)
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return ENOMEM;
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sc->disk->d_name = "cfid";
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sc->disk->d_unit = device_get_unit(dev);
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sc->disk->d_open = cfi_disk_open;
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sc->disk->d_close = cfi_disk_close;
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sc->disk->d_strategy = cfi_disk_strategy;
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sc->disk->d_ioctl = cfi_disk_ioctl;
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sc->disk->d_dump = NULL; /* NB: no dumps */
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sc->disk->d_getattr = cfi_disk_getattr;
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sc->disk->d_sectorsize = CFI_DISK_SECSIZE;
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sc->disk->d_mediasize = sc->parent->sc_size;
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sc->disk->d_maxsize = CFI_DISK_MAXIOSIZE;
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/* NB: use stripesize to hold the erase/region size */
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if (sc->parent->sc_regions) {
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/*
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* Multiple regions, use the last one. This is a
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* total hack as it's (presently) used only by
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* geom_redboot to locate the FIS directory which
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* lies at the start of the last erase region.
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*/
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sc->disk->d_stripesize =
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sc->parent->sc_region[sc->parent->sc_regions-1].r_blksz;
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} else
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sc->disk->d_stripesize = sc->disk->d_mediasize;
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sc->disk->d_drv1 = sc;
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disk_create(sc->disk, DISK_VERSION);
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mtx_init(&sc->qlock, "CFID I/O lock", NULL, MTX_DEF);
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bioq_init(&sc->bioq);
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sc->tq = taskqueue_create("cfid_taskq", M_NOWAIT,
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taskqueue_thread_enqueue, &sc->tq);
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taskqueue_start_threads(&sc->tq, 1, PI_DISK, "cfid taskq");
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TASK_INIT(&sc->iotask, 0, cfi_io_proc, sc);
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return 0;
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}
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static int
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cfi_disk_detach(device_t dev)
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{
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struct cfi_disk_softc *sc = device_get_softc(dev);
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if (sc->flags & CFI_DISK_OPEN)
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return EBUSY;
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taskqueue_free(sc->tq);
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/* XXX drain bioq */
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disk_destroy(sc->disk);
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mtx_destroy(&sc->qlock);
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return 0;
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}
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static int
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cfi_disk_open(struct disk *dp)
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{
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struct cfi_disk_softc *sc = dp->d_drv1;
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/* XXX no interlock with /dev/cfi */
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sc->flags |= CFI_DISK_OPEN;
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return 0;
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}
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static int
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cfi_disk_close(struct disk *dp)
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{
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struct cfi_disk_softc *sc = dp->d_drv1;
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sc->flags &= ~CFI_DISK_OPEN;
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return 0;
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}
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static void
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cfi_disk_read(struct cfi_softc *sc, struct bio *bp)
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{
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long resid;
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KASSERT(sc->sc_width == 1 || sc->sc_width == 2 || sc->sc_width == 4,
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("sc_width %d", sc->sc_width));
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if (sc->sc_writing) {
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bp->bio_error = cfi_block_finish(sc);
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if (bp->bio_error) {
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bp->bio_flags |= BIO_ERROR;
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goto done;
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}
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}
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if (bp->bio_offset > sc->sc_size) {
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bp->bio_flags |= BIO_ERROR;
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bp->bio_error = EIO;
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goto done;
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}
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resid = bp->bio_bcount;
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if (sc->sc_width == 1) {
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uint8_t *dp = (uint8_t *)bp->bio_data;
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while (resid > 0 && bp->bio_offset < sc->sc_size) {
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*dp++ = cfi_read_raw(sc, bp->bio_offset);
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bp->bio_offset += 1, resid -= 1;
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}
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} else if (sc->sc_width == 2) {
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uint16_t *dp = (uint16_t *)bp->bio_data;
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while (resid > 0 && bp->bio_offset < sc->sc_size) {
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*dp++ = cfi_read_raw(sc, bp->bio_offset);
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bp->bio_offset += 2, resid -= 2;
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}
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} else {
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uint32_t *dp = (uint32_t *)bp->bio_data;
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while (resid > 0 && bp->bio_offset < sc->sc_size) {
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*dp++ = cfi_read_raw(sc, bp->bio_offset);
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bp->bio_offset += 4, resid -= 4;
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}
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}
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bp->bio_resid = resid;
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done:
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biodone(bp);
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}
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static void
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cfi_disk_write(struct cfi_softc *sc, struct bio *bp)
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{
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long resid;
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u_int top;
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KASSERT(sc->sc_width == 1 || sc->sc_width == 2 || sc->sc_width == 4,
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("sc_width %d", sc->sc_width));
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if (bp->bio_offset > sc->sc_size) {
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bp->bio_flags |= BIO_ERROR;
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bp->bio_error = EIO;
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goto done;
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}
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resid = bp->bio_bcount;
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while (resid > 0) {
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/*
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* Finish the current block if we're about to write
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* to a different block.
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*/
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if (sc->sc_writing) {
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top = sc->sc_wrofs + sc->sc_wrbufsz;
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if (bp->bio_offset < sc->sc_wrofs ||
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bp->bio_offset >= top)
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cfi_block_finish(sc);
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}
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/* Start writing to a (new) block if applicable. */
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if (!sc->sc_writing) {
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bp->bio_error = cfi_block_start(sc, bp->bio_offset);
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if (bp->bio_error) {
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bp->bio_flags |= BIO_ERROR;
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goto done;
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}
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}
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top = sc->sc_wrofs + sc->sc_wrbufsz;
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bcopy(bp->bio_data,
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sc->sc_wrbuf + bp->bio_offset - sc->sc_wrofs,
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MIN(top - bp->bio_offset, resid));
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resid -= MIN(top - bp->bio_offset, resid);
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}
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bp->bio_resid = resid;
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done:
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biodone(bp);
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}
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static void
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cfi_io_proc(void *arg, int pending)
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{
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struct cfi_disk_softc *sc = arg;
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struct cfi_softc *cfi = sc->parent;
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struct bio *bp;
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for (;;) {
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mtx_lock(&sc->qlock);
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bp = bioq_takefirst(&sc->bioq);
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mtx_unlock(&sc->qlock);
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if (bp == NULL)
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break;
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switch (bp->bio_cmd) {
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case BIO_READ:
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cfi_disk_read(cfi, bp);
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break;
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case BIO_WRITE:
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cfi_disk_write(cfi, bp);
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break;
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}
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}
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}
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static int
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cfi_disk_getattr(struct bio *bp)
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{
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struct cfi_disk_softc *dsc;
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struct cfi_softc *sc;
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device_t dev;
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if (bp->bio_disk == NULL || bp->bio_disk->d_drv1 == NULL)
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return (ENXIO);
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dsc = bp->bio_disk->d_drv1;
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sc = dsc->parent;
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dev = sc->sc_dev;
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if (strcmp(bp->bio_attribute, "CFI::device") == 0) {
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if (bp->bio_length != sizeof(dev))
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return (EFAULT);
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bcopy(&dev, bp->bio_data, sizeof(dev));
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} else
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return (-1);
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return (0);
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}
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static void
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cfi_disk_strategy(struct bio *bp)
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{
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struct cfi_disk_softc *sc = bp->bio_disk->d_drv1;
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if (sc == NULL) {
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biofinish(bp, NULL, EINVAL);
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return;
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}
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if (bp->bio_bcount == 0) {
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bp->bio_resid = bp->bio_bcount;
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biodone(bp);
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return;
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}
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switch (bp->bio_cmd) {
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case BIO_READ:
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case BIO_WRITE:
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mtx_lock(&sc->qlock);
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/* no value in sorting requests? */
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bioq_insert_tail(&sc->bioq, bp);
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mtx_unlock(&sc->qlock);
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taskqueue_enqueue(sc->tq, &sc->iotask);
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break;
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default:
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biofinish(bp, NULL, EOPNOTSUPP);
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break;
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}
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}
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static int
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cfi_disk_ioctl(struct disk *dp, u_long cmd, void *data, int fflag,
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struct thread *td)
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{
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return EINVAL;
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}
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static device_method_t cfi_disk_methods[] = {
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DEVMETHOD(device_probe, cfi_disk_probe),
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DEVMETHOD(device_attach, cfi_disk_attach),
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DEVMETHOD(device_detach, cfi_disk_detach),
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{ 0, 0 }
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};
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static driver_t cfi_disk_driver = {
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"cfid",
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cfi_disk_methods,
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sizeof(struct cfi_disk_softc),
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};
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DRIVER_MODULE(cfid, cfi, cfi_disk_driver, cfi_diskclass, 0, NULL);
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