protect the registers so it was trivially possible for a sync command and
i/o command to fight each other and confuse the controller. Make the
sync fib alloc/release functions inline and remove the somewhat worthless
AAC_SYNC_LOCK_FORCE flag. Thanks to Adil Katchi for helping me to track
this down in RELENG_4.
- Add data structuress for doing 64-bit scatter/gather
- Move busdma tag creations around so that only the parent is
created in aac_pci.c.
- Retrieve the capabilities word from the firmware before setting
up command structures and tags. This allows the driver to decide
whether to do 64-bit commands, and if work-arounds are needed for
systems with >2GB of RAM.
- Only enable the SCSI passthrough if it's enabled in the capabilities
word in the firmware.
This should fix problems with the 2120S and 2200S cards in systems with more
than 2GB of RAM. Full 64-bit support is forthcoming.
MFC-After: 1 week
in geom_disk.c.
As a side effect this makes a lot of #include <sys/devicestat.h>
lines not needed and some biofinish() calls can be reduced to
biodone() again.
- the mutex aac_io_lock protects the main codepaths which handle queues and
hardware registers. Only one acquire/release is done in the top-half and
the taskqueue. This mutex also applies to the userland command path and
CAM data path.
- Move the taskqueue to the new Giant-free version.
- Register the disk device with DISKFLAG_NOGIANT so the top-half processing
runs without Giant.
- Move the dynamic command allocator to the worker thread to avoid locking
issues with bus_dmamem_alloc().
This gives about 20% improvement in most of my benchmarks.
- Move the command timeout check from a separate repeating timeout to the
kthread since the kthread is already running periodically.
- Move printing the hardware print buffer to the kthread.
- Properly shut down the kernel thread on detach.
- Detach the child array devices on detach.
- Don't issue a controller halt command on detach. Doing so requires a PCI
reset to wake the controller back up. The driver can now be unloaded as
long as CAM support is not enabled.
confuses the controller, tell CAM not to do it. Also report the
correct error condition to CAM when it tries to probe a target that
doesn't exists.
This should make the CAM interface less risky to use.
MFC After: 3 days
ever connect a SCSI Cdrom/Tape/Jukebox/Scanner/Printer/kitty-litter-scooper
to your high-end RAID controller. The interface to the arrays is still
via the block interface; this merely provides a way to circumvent the
RAID functionality and access the SCSI buses directly. Note that for
somewhat obvious reasons, hard drives are not exposed to the da driver
through this interface, though you can still talk to them via the pass
driver. Be the first on your block to low-level format unsuspecting
drives that are part of an array!
To enable this, add the 'aacp' device to your kernel config.
MFC after: 3 days
