ida(4) is a driver for older Compaq RAID adapters (PCI and EISA). It is one
of the few remaining non-MPSAFE storage drivers. I have a patch to add
locking to it, but while doing that I fixed several other issues including
incorrect bus_dma support (it didn't handle deferred callbacks and
EINPROGRESS
at all). It also did not pre-allocate dma maps but attempted to create them
on the fly (despite a comment claiming that it did pre-allocate them). It now
probes disks using a configintrhook rather than using polled commands. The
drive number for each logical disk is passed to the child disk device via
ivars. I've added bus_dma sync ops for the hardware QCB accesses. I've
also
reworked it's queuing mechanism so that it should now queue multiple
commands
to the controller (before it only queued one command at a time even though it
had free QCBs). The patch compiles, but I have no hardware to test it. Given
that this is an old driver, if I can't find anyone to test it, I will remove
it from HEAD after committing the fixes (so if someone shows up in the future
there is a better base to start from).
http://www.FreeBSD.org/~jhb/patches/ida_locking_dma.patch
--
John Baldwin
