[Bug 237463] aacraid(4) doesn't work on powerpc64

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237463

Leandro Lupori <luporl at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |In Progress

--- Comment #3 from Leandro Lupori <luporl at FreeBSD.org> ---
Status update:

After converting all FIB structures needed by aacraid.c and aacraid_cam.c to
big-endian, when needed, the driver started going further, but there were still
some issues:
- sense data was causing a buffer overflow, because of wrong max sense len
logic
- after several read/write operations, the kernel was panic'ing in
bus_dmamap_sync(). This was due to a missing aac_unmap_command() in the SYNC
path.

(I'm currently holding the patches until I have a minimal working version of
aacraid driver).

Now I'm able to perform several reads and writes, sometimes even complete a
FreeBSD install from ISO to disk, but there is still (at least) one issue
remaining. After some time of disk activity, write commands begin to fail with
Selection Timeout errors. They usually fail 3 times in a row and the periph is
then destroyed.

After some debugging, I've noticed the timeouts start to occur right after
receiving an AIF interrupt. For some reason I don't know yet, the response to
an AifRequest in SYNC mode comes with no AIF information, so I don't know what
the adapter is trying to tell me.

Any help or debugging tip is appreciated!

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