freebsd-dev/sys/dev/cfi/cfi_disk.c

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/*-
* Copyright (c) 2009 Sam Leffler, Errno Consulting
* Copyright (c) 2012-2013, SRI International
* All rights reserved.
*
* Portions of this software were 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 ``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 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/systm.h>
#include <sys/bio.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <sys/taskqueue.h>
#include <machine/bus.h>
#include <dev/cfi/cfi_var.h>
#include <geom/geom.h>
#include <geom/geom_disk.h>
struct cfi_disk_softc {
struct cfi_softc *parent;
struct disk *disk;
int flags;
#define CFI_DISK_OPEN 0x0001
struct bio_queue_head bioq; /* bio queue */
struct mtx qlock; /* bioq lock */
struct taskqueue *tq; /* private task queue for i/o request */
struct task iotask; /* i/o processing */
};
#define CFI_DISK_SECSIZE 512
#define CFI_DISK_MAXIOSIZE 65536
static int cfi_disk_detach(device_t);
static int cfi_disk_open(struct disk *);
static int cfi_disk_close(struct disk *);
static void cfi_io_proc(void *, int);
static int cfi_disk_getattr(struct bio *);
static void cfi_disk_strategy(struct bio *);
static int cfi_disk_ioctl(struct disk *, u_long, void *, int, struct thread *);
static int
cfi_disk_probe(device_t dev)
{
return 0;
}
static int
cfi_disk_attach(device_t dev)
{
struct cfi_disk_softc *sc = device_get_softc(dev);
sc->parent = device_get_softc(device_get_parent(dev));
/* validate interface width; assumed by other code */
if (sc->parent->sc_width != 1 &&
sc->parent->sc_width != 2 &&
sc->parent->sc_width != 4)
return EINVAL;
sc->disk = disk_alloc();
if (sc->disk == NULL)
return ENOMEM;
sc->disk->d_name = "cfid";
sc->disk->d_unit = device_get_unit(dev);
sc->disk->d_open = cfi_disk_open;
sc->disk->d_close = cfi_disk_close;
sc->disk->d_strategy = cfi_disk_strategy;
sc->disk->d_ioctl = cfi_disk_ioctl;
sc->disk->d_dump = NULL; /* NB: no dumps */
sc->disk->d_getattr = cfi_disk_getattr;
sc->disk->d_sectorsize = CFI_DISK_SECSIZE;
sc->disk->d_mediasize = sc->parent->sc_size;
sc->disk->d_maxsize = CFI_DISK_MAXIOSIZE;
/* NB: use stripesize to hold the erase/region size */
if (sc->parent->sc_regions) {
/*
* Multiple regions, use the last one. This is a
* total hack as it's (presently) used only by
* geom_redboot to locate the FIS directory which
* lies at the start of the last erase region.
*/
sc->disk->d_stripesize =
sc->parent->sc_region[sc->parent->sc_regions-1].r_blksz;
} else
sc->disk->d_stripesize = sc->disk->d_mediasize;
sc->disk->d_drv1 = sc;
disk_create(sc->disk, DISK_VERSION);
mtx_init(&sc->qlock, "CFID I/O lock", NULL, MTX_DEF);
bioq_init(&sc->bioq);
sc->tq = taskqueue_create("cfid_taskq", M_NOWAIT,
taskqueue_thread_enqueue, &sc->tq);
taskqueue_start_threads(&sc->tq, 1, PI_DISK, "cfid taskq");
TASK_INIT(&sc->iotask, 0, cfi_io_proc, sc);
return 0;
}
static int
cfi_disk_detach(device_t dev)
{
struct cfi_disk_softc *sc = device_get_softc(dev);
if (sc->flags & CFI_DISK_OPEN)
return EBUSY;
taskqueue_free(sc->tq);
/* XXX drain bioq */
disk_destroy(sc->disk);
mtx_destroy(&sc->qlock);
return 0;
}
static int
cfi_disk_open(struct disk *dp)
{
struct cfi_disk_softc *sc = dp->d_drv1;
/* XXX no interlock with /dev/cfi */
sc->flags |= CFI_DISK_OPEN;
return 0;
}
static int
cfi_disk_close(struct disk *dp)
{
struct cfi_disk_softc *sc = dp->d_drv1;
sc->flags &= ~CFI_DISK_OPEN;
return 0;
}
static void
cfi_disk_read(struct cfi_softc *sc, struct bio *bp)
{
long resid;
KASSERT(sc->sc_width == 1 || sc->sc_width == 2 || sc->sc_width == 4,
("sc_width %d", sc->sc_width));
if (sc->sc_writing) {
bp->bio_error = cfi_block_finish(sc);
if (bp->bio_error) {
bp->bio_flags |= BIO_ERROR;
goto done;
}
}
if (bp->bio_offset > sc->sc_size) {
bp->bio_flags |= BIO_ERROR;
bp->bio_error = EIO;
goto done;
}
resid = bp->bio_bcount;
if (sc->sc_width == 1) {
uint8_t *dp = (uint8_t *)bp->bio_data;
while (resid > 0 && bp->bio_offset < sc->sc_size) {
*dp++ = cfi_read_raw(sc, bp->bio_offset);
bp->bio_offset += 1, resid -= 1;
}
} else if (sc->sc_width == 2) {
uint16_t *dp = (uint16_t *)bp->bio_data;
while (resid > 0 && bp->bio_offset < sc->sc_size) {
*dp++ = cfi_read_raw(sc, bp->bio_offset);
bp->bio_offset += 2, resid -= 2;
}
} else {
uint32_t *dp = (uint32_t *)bp->bio_data;
while (resid > 0 && bp->bio_offset < sc->sc_size) {
*dp++ = cfi_read_raw(sc, bp->bio_offset);
bp->bio_offset += 4, resid -= 4;
}
}
bp->bio_resid = resid;
done:
biodone(bp);
}
static void
cfi_disk_write(struct cfi_softc *sc, struct bio *bp)
{
long resid;
u_int top;
KASSERT(sc->sc_width == 1 || sc->sc_width == 2 || sc->sc_width == 4,
("sc_width %d", sc->sc_width));
if (bp->bio_offset > sc->sc_size) {
bp->bio_flags |= BIO_ERROR;
bp->bio_error = EIO;
goto done;
}
resid = bp->bio_bcount;
while (resid > 0) {
/*
* Finish the current block if we're about to write
* to a different block.
*/
if (sc->sc_writing) {
top = sc->sc_wrofs + sc->sc_wrbufsz;
if (bp->bio_offset < sc->sc_wrofs ||
bp->bio_offset >= top)
cfi_block_finish(sc);
}
/* Start writing to a (new) block if applicable. */
if (!sc->sc_writing) {
bp->bio_error = cfi_block_start(sc, bp->bio_offset);
if (bp->bio_error) {
bp->bio_flags |= BIO_ERROR;
goto done;
}
}
top = sc->sc_wrofs + sc->sc_wrbufsz;
bcopy(bp->bio_data,
sc->sc_wrbuf + bp->bio_offset - sc->sc_wrofs,
MIN(top - bp->bio_offset, resid));
resid -= MIN(top - bp->bio_offset, resid);
}
bp->bio_resid = resid;
done:
biodone(bp);
}
static void
cfi_io_proc(void *arg, int pending)
{
struct cfi_disk_softc *sc = arg;
struct cfi_softc *cfi = sc->parent;
struct bio *bp;
for (;;) {
mtx_lock(&sc->qlock);
bp = bioq_takefirst(&sc->bioq);
mtx_unlock(&sc->qlock);
if (bp == NULL)
break;
switch (bp->bio_cmd) {
case BIO_READ:
cfi_disk_read(cfi, bp);
break;
case BIO_WRITE:
cfi_disk_write(cfi, bp);
break;
}
}
}
static int
cfi_disk_getattr(struct bio *bp)
{
struct cfi_disk_softc *dsc;
struct cfi_softc *sc;
device_t dev;
if (bp->bio_disk == NULL || bp->bio_disk->d_drv1 == NULL)
return (ENXIO);
dsc = bp->bio_disk->d_drv1;
sc = dsc->parent;
dev = sc->sc_dev;
if (strcmp(bp->bio_attribute, "CFI::device") == 0) {
if (bp->bio_length != sizeof(dev))
return (EFAULT);
bcopy(&dev, bp->bio_data, sizeof(dev));
} else
return (-1);
return (0);
}
static void
cfi_disk_strategy(struct bio *bp)
{
struct cfi_disk_softc *sc = bp->bio_disk->d_drv1;
if (sc == NULL)
goto invalid;
if (bp->bio_bcount == 0) {
bp->bio_resid = bp->bio_bcount;
biodone(bp);
return;
}
switch (bp->bio_cmd) {
case BIO_READ:
case BIO_WRITE:
mtx_lock(&sc->qlock);
/* no value in sorting requests? */
bioq_insert_tail(&sc->bioq, bp);
mtx_unlock(&sc->qlock);
taskqueue_enqueue(sc->tq, &sc->iotask);
return;
}
/* fall thru... */
invalid:
bp->bio_flags |= BIO_ERROR;
bp->bio_error = EINVAL;
biodone(bp);
}
static int
cfi_disk_ioctl(struct disk *dp, u_long cmd, void *data, int fflag,
struct thread *td)
{
return EINVAL;
}
static device_method_t cfi_disk_methods[] = {
DEVMETHOD(device_probe, cfi_disk_probe),
DEVMETHOD(device_attach, cfi_disk_attach),
DEVMETHOD(device_detach, cfi_disk_detach),
{ 0, 0 }
};
static driver_t cfi_disk_driver = {
"cfid",
cfi_disk_methods,
sizeof(struct cfi_disk_softc),
};
DRIVER_MODULE(cfid, cfi, cfi_disk_driver, cfi_diskclass, 0, NULL);