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freebsd-skq/sys/dev/firewire/00README
glebius f41a83bf42 Big polling(4) cleanup. 
o Axe poll in trap.

o Axe IFF_POLLING flag from if_flags.

o Rework revision 1.21 (Giant removal), in such a way that
  poll_mtx is not dropped during call to polling handler.
  This fixes problem with idle polling.

o Make registration and deregistration from polling in a
  functional way, insted of next tick/interrupt.

o Obsolete kern.polling.enable. Polling is turned on/off
  with ifconfig.

Detailed kern_poll.c changes:
  - Remove polling handler flags, introduced in 1.21. The are not
    needed now.
  - Forget and do not check if_flags, if_capenable and if_drv_flags.
  - Call all registered polling handlers unconditionally.
  - Do not drop poll_mtx, when entering polling handlers.
  - In ether_poll() NET_LOCK_GIANT prior to locking poll_mtx.
  - In netisr_poll() axe the block, where polling code asks drivers
    to unregister.
  - In netisr_poll() and ether_poll() do polling always, if any
    handlers are present.
  - In ether_poll_[de]register() remove a lot of error hiding code. Assert
    that arguments are correct, instead.
  - In ether_poll_[de]register() use standard return values in case of
    error or success.
  - Introduce poll_switch() that is a sysctl handler for kern.polling.enable.
    poll_switch() goes through interface list and enabled/disables polling.
    A message that kern.polling.enable is deprecated is printed.

Detailed driver changes:
  - On attach driver announces IFCAP_POLLING in if_capabilities, but
    not in if_capenable.
  - On detach driver calls ether_poll_deregister() if polling is enabled.
  - In polling handler driver obtains its lock and checks IFF_DRV_RUNNING
    flag. If there is no, then unlocks and returns.
  - In ioctl handler driver checks for IFCAP_POLLING flag requested to
    be set or cleared. Driver first calls ether_poll_[de]register(), then
    obtains driver lock and [dis/en]ables interrupts.
  - In interrupt handler driver checks IFCAP_POLLING flag in if_capenable.
    If present, then returns.This is important to protect from spurious
    interrupts.

Reviewed by:	ru, sam, jhb
2005-10-01 18:56:19 +00:00

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$FreeBSD$
IEEE 1394 support for FreeBSD-5.X and 4.X.
1. Introduction
This tarball contains IEEE1394(FireWire) driver which is first
written by Katsushi Kobayashi[1] <ikob@koganei.wide.ad.jp> and
modified by Hidetoshi Shimokawa <simokawa@freebsd.org>.
Please note this driver is still under development.
You can find latest snapshots under:
http://people.freebsd.org/~simokawa/
named firewire-2002XXXX.tar.gz
The driver consists of 6 parts:
- fwohci.c/fwohci_pci.c
OHCI[2] driver
- IEEE1394 link/phy chip control
- firewire.c
Chip independent driver
- CSR
- Transaction
- Character devices for userland
- fwmem.c
/dev/fwmem0: physical memory of a remote node.
- sbp.c
SBP-II[3] (a.k.a. SCSI over FireWire) driver
- if_fwe.c
NON-Standard implementation of Ethernet over FireWire.
- bus_mgm.c (userland)
Bus management function for user.
show topology map, change gap count, bus reset, etc.
2. Installation
Suppose you have kernel source at /sys.
- Extract tarball at root directory.
- cd /sys/dev/firewire
- make
- make install
- make load
For FreeBSD-4 user:
- ./MAKEDEV
3. SBP-II support (sbp)
- You need CAM(SCSI) support in your kernel.
If you are using FreeBSD-5 before 2002/03/23 or FreeBSD-4 before
2002/4/8, you need to apply CAM-patch in this archive
to handle HDD's(T_RBC or T_DIRECT which doesn't support READ_6).
- If you connect a few firewire devices only, try the following to
reduce gap overhead.
- ./bus_mgm -g 8
4. Ethernet over FireWire (if_fwe)
This is a sample driver for ethernet emulation. Please note this
does NOT conform to any standards like IP over FireWire(RFC2734[4]).
It just sends ethernet frames encapsulated in asynchronous stream
packets. It doesn't scale because it does something like unicast over multicast, but it's easy to be implemented and you can use any
facilities what ethernet can do. (ipv6, bridging, vlan etc.)
It also has DEVICE_POLLING[5] support. To enable it, edit your
kernel config file and Makefile.fwe then rebuild kernel and if_fwe.ko.
5. FireWire for Kernel Hackers
As you know, IEEE1394 is a bus and OHCI supports physical access
to the host memory. This means that you can access the remote
host over firewire without software support at the remote host.
In other words, you can investigate remote host's physical memory
whether its OS is alive or crashed or hangs up.
You need to apply KVMLIB-patch and rebuild libkvm then rebuild ps,
dmesg and gdb those are statically linked.
You may want to apply GDB-patch in this archive to get same behavior
as gdb with /dev/mem or want to insert savectx(&dumppcb) into panic(),
breakpoint() and so on to emulation crash dump.
You have to determine target node_id manually at this point.
(guess using bus_mgm -t or dmesg)
(Targets should be specified by EUI64 in the future)
# sysctl kern.firewire.fwmem_node=[node_id]
# ps -agx -M /dev/fwmem0 -N /sys/i386/compile/GENERIC/kernel
# dmesg -M /dev/fwmem0 -N /sys/i386/compile/GENERIC/kernel
# gdb -k -c /dev/fwmem0 /sys/i386/compile/GENERIC/kernel.debug
# dd if=/dev/fwmem0 of=vmcore bs=1m count=[phys. memory in MB]
remote gdb at 400,000,000 bps :-)
6. DV
I have not tested yet.
7. Tested HW
OS
- FreeBSD-4/i386
- FreeBSD-4/alpha
- FreeBSD-5/i386
* Not tested on SMP.
* Not tested on big-endian machine...
OHCI
- Texas Instruments TSB12LV26 (PCI)
- Texas Instruments TSB43AA22 (PCI/Cardbus)
* There might be phy probing problem but most of the OHCI
chips should work.
* Tested with multiple firewire buses.
SBP-II
- HDD: Logitec USB/FireWire LHD-P30FU
- HDD: Yano A-dish 120GB
- HDD: Yano B-Max 320GB
The repository of cvsup2.jp.freebsd.org is on this device.
- HDD: Personal Storage 3000XT 160GB
The last sector of this drive cannot be accessed..
- DVD-RAM: Panasonic LF-D340JD
- SCSI-FireWire converter: Yano FWSCSI-01
We can recognize only 1 device/lun at this point
- HDD: iPod, PowerBook G4 (target mode)
Reported by ikob
- Scanner: Epson GT-9700F
Now works!!
Sane-backend needs a patch(SANE-patch in this archive).
if_fwe
- IPv4, IPv6, bridging, vlan.
- You need at least two FreeBSD machines with this driver to use.
References:
[1] ftp://ftp.uec.ac.jp/pub/firewire/beta/
[2] http://developer.intel.com/technology/1394/download/ohci_11.htm
[3] http://www.t10.org/scsi-3.htm
[4] http://www.faqs.org/rfcs/rfc2734.html
[5] http://info.iet.unipi.it/~luigi/polling/
Hidetoshi Shimokawa
simokawa@freebsd.org
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