/*
* Core device strategy call, used to issue I/O on a device. There are
* two versions, a non-chained version and a chained version. The chained
* version reuses a BIO set up by vn_strategy(). The only difference is
* that, for now, we do not push a new tracking structure when chaining
* from vn_strategy. XXX this will ultimately have to change.
*/
void
dev_dstrategy(cdev_t dev, struct bio *bio)
{
struct dev_strategy_args ap;
struct bio_track *track;
int needmplock = dev_needmplock(dev);
ap.a_head.a_desc = &dev_strategy_desc;
ap.a_head.a_dev = dev;
ap.a_bio = bio;
KKASSERT(bio->bio_track == NULL);
KKASSERT(bio->bio_buf->b_cmd != BUF_CMD_DONE);
if (bio->bio_buf->b_cmd == BUF_CMD_READ)
track = &dev->si_track_read;
else
track = &dev->si_track_write;
bio_track_ref(track);
bio->bio_track = track;
if (dsched_is_clear_buf_priv(bio->bio_buf))
dsched_new_buf(bio->bio_buf);
KKASSERT((bio->bio_flags & BIO_DONE) == 0);
if (needmplock) {
get_mplock();
++mplock_strategies;
} else {
++mpsafe_strategies;
}
(void)dev->si_ops->d_strategy(&ap);
if (needmplock)
rel_mplock();
}
int
dev_dwrite(cdev_t dev, struct uio *uio, int ioflag, struct file *fp)
{
struct dev_write_args ap;
int needmplock = dev_needmplock(dev);
int error;
dev->si_lastwrite = time_uptime;
ap.a_head.a_desc = &dev_write_desc;
ap.a_head.a_dev = dev;
ap.a_uio = uio;
ap.a_ioflag = ioflag;
ap.a_fp = fp;
if (needmplock) {
get_mplock();
++mplock_writes;
} else {
++mpsafe_writes;
}
error = dev->si_ops->d_write(&ap);
if (needmplock)
rel_mplock();
return (error);
}
int
dev_dread(cdev_t dev, struct uio *uio, int ioflag, struct file *fp)
{
struct dev_read_args ap;
int needmplock = dev_needmplock(dev);
int error;
ap.a_head.a_desc = &dev_read_desc;
ap.a_head.a_dev = dev;
ap.a_uio = uio;
ap.a_ioflag = ioflag;
ap.a_fp = fp;
if (needmplock) {
get_mplock();
++mplock_reads;
} else {
++mpsafe_reads;
}
error = dev->si_ops->d_read(&ap);
if (needmplock)
rel_mplock();
if (error == 0)
dev->si_lastread = time_uptime;
return (error);
}
int
dev_dclone(cdev_t dev)
{
struct dev_clone_args ap;
int needmplock = dev_needmplock(dev);
int error;
ap.a_head.a_desc = &dev_clone_desc;
ap.a_head.a_dev = dev;
if (needmplock)
get_mplock();
error = dev->si_ops->d_clone(&ap);
if (needmplock)
rel_mplock();
return (error);
}
void
dev_dstrategy_chain(cdev_t dev, struct bio *bio)
{
struct dev_strategy_args ap;
int needmplock = dev_needmplock(dev);
ap.a_head.a_desc = &dev_strategy_desc;
ap.a_head.a_dev = dev;
ap.a_bio = bio;
KKASSERT(bio->bio_track != NULL);
KKASSERT((bio->bio_flags & BIO_DONE) == 0);
if (needmplock)
get_mplock();
(void)dev->si_ops->d_strategy(&ap);
if (needmplock)
rel_mplock();
}
int
dev_dclose(cdev_t dev, int fflag, int devtype)
{
struct dev_close_args ap;
int needmplock = dev_needmplock(dev);
int error;
ap.a_head.a_desc = &dev_close_desc;
ap.a_head.a_dev = dev;
ap.a_fflag = fflag;
ap.a_devtype = devtype;
if (needmplock)
get_mplock();
error = dev->si_ops->d_close(&ap);
if (needmplock)
rel_mplock();
return (error);
}
/************************************************************************
* GENERAL DEVICE API FUNCTIONS *
************************************************************************
*
* The MPSAFEness of these depends on dev->si_ops->head.flags
*/
int
dev_dopen(cdev_t dev, int oflags, int devtype, struct ucred *cred)
{
struct dev_open_args ap;
int needmplock = dev_needmplock(dev);
int error;
ap.a_head.a_desc = &dev_open_desc;
ap.a_head.a_dev = dev;
ap.a_oflags = oflags;
ap.a_devtype = devtype;
ap.a_cred = cred;
if (needmplock)
get_mplock();
error = dev->si_ops->d_open(&ap);
if (needmplock)
rel_mplock();
return (error);
}
int
dev_dmmap(cdev_t dev, vm_offset_t offset, int nprot)
{
struct dev_mmap_args ap;
int needmplock = dev_needmplock(dev);
int error;
ap.a_head.a_desc = &dev_mmap_desc;
ap.a_head.a_dev = dev;
ap.a_offset = offset;
ap.a_nprot = nprot;
if (needmplock)
get_mplock();
error = dev->si_ops->d_mmap(&ap);
if (needmplock)
rel_mplock();
if (error == 0)
return(ap.a_result);
return(-1);
}
int
dev_dioctl(cdev_t dev, u_long cmd, caddr_t data, int fflag, struct ucred *cred,
struct sysmsg *msg)
{
struct dev_ioctl_args ap;
int needmplock = dev_needmplock(dev);
int error;
ap.a_head.a_desc = &dev_ioctl_desc;
ap.a_head.a_dev = dev;
ap.a_cmd = cmd;
ap.a_data = data;
ap.a_fflag = fflag;
ap.a_cred = cred;
ap.a_sysmsg = msg;
if (needmplock)
get_mplock();
error = dev->si_ops->d_ioctl(&ap);
if (needmplock)
rel_mplock();
return (error);
}
int
dev_dmmap_single(cdev_t dev, vm_ooffset_t *offset, vm_size_t size,
struct vm_object **object, int nprot)
{
struct dev_mmap_single_args ap;
int needmplock = dev_needmplock(dev);
int error;
ap.a_head.a_desc = &dev_mmap_single_desc;
ap.a_head.a_dev = dev;
ap.a_offset = offset;
ap.a_size = size;
ap.a_object = object;
ap.a_nprot = nprot;
if (needmplock)
get_mplock();
error = dev->si_ops->d_mmap_single(&ap);
if (needmplock)
rel_mplock();
return(error);
}
get_mplock();
(void)dev->si_ops->d_strategy(&ap);
if (needmplock)
rel_mplock();
}
/*
* note: the disk layer is expected to set count, blkno, and secsize before
* forwarding the message.
*/
int
dev_ddump(cdev_t dev, void *virtual, vm_offset_t physical, off_t offset,
size_t length)
{
struct dev_dump_args ap;
int needmplock = dev_needmplock(dev);
int error;
ap.a_head.a_desc = &dev_dump_desc;
ap.a_head.a_dev = dev;
ap.a_count = 0;
ap.a_blkno = 0;
ap.a_secsize = 0;
ap.a_virtual = virtual;
ap.a_physical = physical;
ap.a_offset = offset;
ap.a_length = length;
if (needmplock)
get_mplock();
error = dev->si_ops->d_dump(&ap);
