o expect the disk's start routine to return an int. If the
int is non-zero, we enqueue the request and try again
later.
o have a dk_start() routine which runs the request queue.
o have a dk_iodone() function which should be called by the
driver using the framwork from its iodone. dk_iodone will
retry the queue since presumably further progress may be
possible once a request is complete. It is required that
the underlying driver have the resources to keep at least
one transaction in flight at any time.
Modified cgd to:
o be able to keep one transaction in flight at any time
(almost) by keeping a buffer of size MAXPHYS in its softc
and use it.
We still need to make the cgd_cbufpool per device rather than global
and provide a low water mark for it.
Addresses PR: kern/24715
(at least according to the submitter.)
(tightly scoped) reason for recording the node address by recording
the assigned number. Dink pci/if_bge.c to match, since ic/ath.c was
used as the archetype.
external buffer for the PC card connected to the channel. This hack
makes pcmcia cards "being used" at the boot time (by WinCE or NetBSD)
correctly detected. A machine running with root on NFS can now be
properly rebooted.
reversed order.
When you boot with two CF cards inserted, this options makes the one
in the "memory only" slot (channel 1), which is almost always the card
with the NetBSD install, attached as wd0.
Unlike using fixed unit numbers in the kernel config, if you boot with
only a single CF card, that single card will still be wd0 regardless
of which slot it is inserted in.
http://mail-index.netbsd.org/port-hpcsh/2003/10/23/0000.html provides
a more verbose description of why this option is convenient for most
usage patterns.
numbers passed in instead of using a BEGIN construct. nawk didn't like
the hex escapes used there.
Fixes a problem reported by Shin'ichiro TAYA on port-powerpc.
Use "int(NUMBER)%256" instead of just "NUMBER" in the printf "%c"
statements in the awk script. nawk was appearing to refuse outputing
a 0 byte of the low eight bits of the number were 0 but any higher
bits were set.
walnut-mkimg.sh tested using gawk, nawk and mawk.
yesterday's sys/dev/ic/ath.c) to match today's ath.c driver.
Commit now in the hope that Andrew Brown will pick up this file for
any more pending changes.
other semantics from an earlier incarnation.
Call kcont_init() from init_main before device autoconfiguration,
so kcont is availble to device drivers if required.
Also ensure the kthread process runs any pending continuations once
the kthread is finally up and running. For now, use a non-null timeout
to poll the queue periodically. Draining any pending requests just
before the kthread enters its ltsleep()/kc_run loop is cleaner, but
this is the version I tested with an early-in-boot kcont request.)
- Fix a 32-bit overflow that could erroneously return true even if the
currently allocated buffer memory was greater than the high water mark.
- Add an early check for bufmem > hiwater to avoid a needless call to
random().
- Sprinkle some comments.
Add a vm.bufmem sysctl so the current bufmem value can be easily queried
from userland.
Reviewed by Thor Simon.
