Commit graph

96 commits

Author SHA1 Message Date
Andrew Morton
f84c922ba1 ieee1394: sbp2: include fixes
drivers/ieee1394/sbp2.c: In function 'sbp2util_access_timeout':
drivers/ieee1394/sbp2.c:399: error: 'TASK_INTERRUPTIBLE' undeclared (first use in this function)
drivers/ieee1394/sbp2.c:399: error: (Each undeclared identifier is reported only once
drivers/ieee1394/sbp2.c:399: error: for each function it appears in.)
drivers/ieee1394/sbp2.c:399: warning: implicit declaration of function 'signal_pending'
drivers/ieee1394/sbp2.c:399: warning: implicit declaration of function 'schedule_timeout'
drivers/ieee1394/sbp2.c: In function 'sbp2_prep_command_orb_sg':
drivers/ieee1394/sbp2.c:1438: warning: implicit declaration of function 'page_address'
drivers/ieee1394/sbp2.c:1438: warning: passing argument 2 of 'dma_map_single' makes pointer from integer without a cast
drivers/ieee1394/sbp2.c: In function 'sbp2_handle_status_write':
drivers/ieee1394/sbp2.c:1842: error: 'TASK_INTERRUPTIBLE' undeclared (first use in this function)

Possibly due to changes in -mm, but this file should explicitly include the
headers for the stuff it uses.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (brought into alphabetic order)
2007-04-30 00:00:27 +02:00
Stefan Richter
3d269cb50c ieee1394: sbp2: move some memory allocations into non-atomic context
When the command ORB pool is created, the ORB list won't be accessed
concurrently.  Therefore we don't have to take the spinlock there.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-04-30 00:00:27 +02:00
Stefan Richter
2446a79f4f ieee1394: sbp2: optimize DMA direction of s/g tables
Unlike the name suggests, "cmd->scatter_gather_element" holds only the
s/g table, not the actual s/g elements.  Since the table is only read
but never written by the device, DMA_BIDIRECTIONAL can be replaced by
DMA_TO_DEVICE which may be cheaper on some architectures.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-04-30 00:00:27 +02:00
Stefan Richter
0555659d63 ieee1394: sbp2: enforce 32bit DMA mapping
In order to use OHCI-1394 physical DMA, all s/g elements, s/g tables,
ORBs, and response buffers have to reside within the first 4 GB of the
FireWire controller's physical address space.  Set the correct mask for
DMA mappings.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-04-30 00:00:27 +02:00
Stefan Richter
beb2fdcad1 ieee1394: sbp2: lower block queue alignment requirement
The old setting is copy & waste from usb-storage and doesn't apply to
sbp2.  There is only 4-byte alignment required for everything, except
for S/G table elements which have to be 8-byte aligned according to the
SBP-2 spec.  (They happen to be ____cacheline_aligned in our
implementation.  Whether that's good is another question.)

We now simply don't tune block queue alignment at all.  The default
alignment would surely never become anything else than a multiple of 4,
else tons of calls to blk_queue_dma_alignment would have to be added
everywhere in drivers/...

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-02-08 20:59:54 +01:00
Stefan Richter
9c31b38723 ieee1394: sbp2: remove bogus "emulated" host flag
There is no emulation going on here.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-02-08 20:59:48 +01:00
Stefan Richter
4618fd3001 ieee1394: sbp2: use a better wildcard for blacklist
0x000000 could be a valid value to match against, but anything bigger
than 0xffffff cannot.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-02-08 20:57:08 +01:00
Stefan Richter
1a74bc68e4 ieee1394: sbp2: fix probing of some DVD-ROM/RWs
Since commit 98e238cd42 in Linux 2.6.19,
"ieee1394: sbp2: don't prefer MODE SENSE 10", some FireWire DVD-ROMs and
DVD-RWs were mistaken as CD-ROM because sr_mod now sent MODE SENSE 6.
The MMC command set includes only MODE SENSE 10.
http://bugzilla.kernel.org/show_bug.cgi?id=7800

This fix lets sbp2 switch scsi_device.use_10_for_rw on for MMC LUs.
This should rather be done in the command set driver sr_mod, not in the
sbp2 transport driver, and an according patch will follow for a next
Linux release.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-01-10 20:24:42 +01:00
Stefan Richter
97d552e35d ieee1394: sbp2: fix bogus dma mapping
Need to use a PCI device, not a FireWire host device.  Problem found by
Andreas Schwab, mistake pointed out by Benjamin Herrenschmidt.
http://ozlabs.org/pipermail/linuxppc-dev/2006-December/029595.html

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Tested-by: Andreas Schwab <schwab@suse.de>
2006-12-30 14:26:59 +01:00
Stefan Richter
b2bb550c4a ieee1394: sbp2: pass REQUEST_SENSE through to the target
Delete some incorrect code, left over from the initial driver submission
in March 2001.

SBP-2 targets should provide sense data via the SBP-2 status block
(autosense).  We have to pass the REQUEST_SENSE command through to
targets which don't implement autosense, if there are any, and to
accomodate application clients which use this command.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-30 14:26:41 +01:00
Stefan Richter
ec9b7e1044 ieee1394: sbp2: code formatting around work_struct stuff
Merge is finished, can bring the code in readable style again.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 23:23:25 +01:00
Ben Collins
ed30c26ee8 ieee1394: Consolidate driver registering
This patch consolidates some bookkeeping for driver registering. It
closely models what pci_register_driver() does. The main addition is
that the owner of the driver is set, so we get a proper symlink
for /sys/bus/ieee1394/driver/*/module.

Also moves setting of name and bus type into nodemgr. Because of this,
we can remove the EXPORT_SYMBOL for ieee1394_bus_type, since it's now
only used in ieee1394.ko.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 23:11:55 +01:00
Stefan Richter
9b7d9c096d ieee1394: sbp2: convert from PCI DMA to generic DMA
API conversion without change in functionality

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 23:11:43 +01:00
Stefan Richter
58272c1c03 ieee1394: sbp2: wrap two functions into one
Move the body of a function into its only caller.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 23:04:03 +01:00
Stefan Richter
2a533b179d ieee1394: sbp2: update comment on things to do
Some people actually look at those comments.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 23:03:49 +01:00
Stefan Richter
cd641f68d6 ieee1394: sbp2: use list_move_tail()
It's OK to reorder list_del() and sbp2util_free_command_dma() here.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 23:03:38 +01:00
Stefan Richter
138c8af864 ieee1394: sbp2: more concise names for types and variables
"struct scsi_id_instance_data" represents a logical unit.
Rename it to "struct sbp2_lu", and "scsi_id" to "lu".
Rename some other variables too.
Wrap almost all lines after at most 80 columns.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 22:59:34 +01:00
Stefan Richter
9117c6dc43 ieee1394: sbp2: remove unused struct members
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 22:52:41 +01:00
Stefan Richter
28b066795f ieee1394: sbp2: proper unit in module parameter description
It's 2^20 bit/s, not 0.001 bit.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 22:52:29 +01:00
Stefan Richter
ca0c745399 ieee1394: sbp2: clean up sbp2_ namespace
Prepend sbp2*_ to anything globally defined in sbp2.c except for some
macros.  Strip sbp2_ from names of struct members.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 22:51:53 +01:00
Stefan Richter
5796aa7b11 ieee1394: sbp2: some conditions in queue_command are unlikely
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 22:49:39 +01:00
Stefan Richter
e8ca5668f1 ieee1394: sbp2: remove superfluous comments
And update and reformat remaining comments.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 22:45:41 +01:00
Stefan Richter
d19c776414 ieee1394: sbp2: delayed_work -> work_struct
This work is not delayed.

Also bring the code format in a state which reduces my work to merge
pending sbp2 patchs.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 22:40:33 +01:00
Stefan Richter
edf1fb213e ieee1394: sbp2: remove debug macros
No need to keep them in released sources.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 21:46:48 +01:00
Stefan Richter
35644090d8 ieee1394: sbp2: consolidate log levels
Replace some calls to SBP2_ERR and SBP2_WARN by SBP2_INFO.
Remove logging macros SBP2_NOTICE and SBP2_WARN.
Remove direct usage of HPSB_ logging macros.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 21:46:40 +01:00
Stefan Richter
0b885449ac ieee1394: sbp2: remove duplicate code
The same case is handled further below in sbp2scsi_complete_command.
Note, the second version behaves slightly different but looks
preferable.  It's an extremely unlikely case by the way.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 21:46:30 +01:00
Stefan Richter
8c8009e69b ieee1394: sbp2: remove dead code
This has been within #if 0 for a long time and is wrong anyway.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 21:46:20 +01:00
Stefan Richter
ea42ea0f58 ieee1394: sbp2: clean up function declarations
Remove unnecessary function prototypes.
Remove variable names from function prototypes.
Move declarations from sbp2.h to sbp2.c.
Move definitions of driver templates together near the top of sbp2.c.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 21:46:10 +01:00
Stefan Richter
66743e061f ieee1394: sbp2: remove irritating log message
The queue depth can be read from /sys/bus/scsi/devices/*/queue_depth,
so don't log it.  And the hint about speed improvements is misleading,
at least under current kernels.  If serialization is switched off, read
performance is typically increased by less than 10%.  (I did not test
write performance recently.)  On the other hand, serialize_io=0 is not
yet safe due to some implementation issues that are not trivial to fix.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 21:45:58 +01:00
Stefan Richter
23077f1d72 ieee1394: sbp2: slightly reorder sbp2scsi_abort
Put the target's fetch agent into reset state before the underlying ORB
DMA is unmapped and the ->done handler is called.  It is highly unlikely
but the target could access that ORB right before sbp2 sends the reset
request.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-12-07 21:27:30 +01:00
David Howells
c4028958b6 WorkStruct: make allyesconfig
Fix up for make allyesconfig.

Signed-Off-By: David Howells <dhowells@redhat.com>
2006-11-22 14:57:56 +00:00
Stefan Richter
c394f1eafe ieee1394: sbp2: enable auto spin-up for all SBP-2 devices
This is a follow-up to patch "ieee1394: sbp2: enable auto spin-up for
Maxtor disks".  When I 'ejected' an OXUF922 based HDD from a Mac OS X
box, it was spun down by the Mac and did not spin up by itself when
attached to a Linux box right after that.  The first SCSI command that
required the bridge to access the drive ended in
sda:<6>sd 18:0:0:0: Device not ready: <6>: Current: sense key: Not Ready
    Additional sense: Logical unit not ready, initializing cmd. required

Therefore the flag which instructs scsi_mod to send START STOP UNIT with
START=1 ("make medium ready") after such a condition is now enabled
unconditionally for all FireWire storage devices.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:53:01 +02:00
Stefan Richter
98e238cd42 ieee1394: sbp2: don't prefer MODE SENSE 10
In the old days, sbp2 used to coerce all MODE SENSE commands into the
10 bytes version.  When all command set conversions were removed from
sbp2 several months ago, sdev->use_10_for_ms = 1 was added.  Meaning,
higher SCSI layers preferred the 10 bytes version but would try the 6
bytes version if the former failed.

Recently, a problem with the 10 bytes version was discovered.  An Initio
INIC-1530 firmware accepted the 10 bytes version but replied with bogus
data, showing the HDD incorrectly as write-protected.  Since RBC
actually mandates MODE SENSE (6), I checked which version was sent by
Windows XP and Mac OS X 10.3 to an SBP-2 target hosted by Linux --- it
was the 6 bytes version.  (Exception: OS X sent the 10 bytes version to
an MMC target.  RBC and SBC got MODE SENSE (6).)

Therefore, drop the use_10_for_ms flag from sbp2.  Now the upper layers
will try MODE SENSE (6) before MODE SENSE (10) on all SBP-2 devices.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:38:52 +02:00
Stefan Richter
2cccbb555c ieee1394: sbp2: prevent rare deadlock in shutdown
Scsi_remove_device() may go into uninterruptible sleep if blocked.
Therefore sbp2_remove() unblocks the Scsi_Host before the device is
requested to be removed.  But there could be another 1394 bus reset
after that which would block the host again.  The 1394 subsystem won't
call sbp2_update() concurrently to sbp2_remove(), which is why there is
no chance for sbp2_remove() to be unblocked by sbp2_update().

The fix is to tell sbp2's bus reset handler when a device is to be shut
down so that it skips scsi_block_requests() on that host.  As before,
any new commands after a reset without reconnect will be failed quickly
by sbp2scsi_queuecommand().

In the long term, means to go without scsi_block_requests() should be
found.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:34:44 +02:00
Stefan Richter
902abed158 ieee1394: sbp2: update includes
Remove unused includes.  Add missing includes, i.e. explicitly include
all used headers.  Sort includes alphabetically.  Replace one call to
signal_pending(current) to avoid to include headers just for this line.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:34:41 +02:00
Stefan Richter
abbca103a0 ieee1394: sbp2: better handling of transport errors
If the target signals a transport failure via status block, complete the
request with DID_BUSY to indicate to the SCSI subsystem that the command
may succeed when retried.

Also log diagnostic information if the status block shows a transport
related problem.  It may point to hardware faults.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:34:37 +02:00
Stefan Richter
4fc383c09d ieee1394: sbp2: recheck node generation in sbp2_update
While sbp2_update() is doing its duties after a bus reset, another reset
could happen.  Don't accept new requests until the next undisturbed
sbp2_update() or until sbp2_remove().

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:34:33 +02:00
Stefan Richter
1f427e8055 ieee1394: sbp2: safer agent reset in error handlers
The scsi_host_template's eh_abort_handler and eh_device_reset_handler
are allowed to sleep.  Use this to run sbp2_agent_reset in the more
reliable mode which returns _after_ its write transaction was finished.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:34:30 +02:00
Stefan Richter
09ee67abe9 ieee1394: sbp2: handle "sbp2util_node_write_no_wait failed"
Fix for http://bugzilla.kernel.org/show_bug.cgi?id=6948

Because sbp2 writes to the target's fetch agent's registers from within
atomic context, it cannot sleep to guaranteedly get a free transaction
label.  This may repeatedly lead to "sbp2util_node_write_no_wait failed"
and consequently to SCSI command abortion after timeout.  A likely cause
is that many queue_command softirqs may occur before khpsbpkt (the
ieee1394 driver's thread which cleans up after finished transactions) is
woken up to recycle tlabels.

Sbp2 now schedules a workqueue job whenever sbp2_link_orb_command fails
in sbp2util_node_write_no_wait.  The job will reliably get a transaction
label because it can sleep.

We use the kernel-wide shared workqueue because it is unlikely that the
job itself actually needs to sleep.  In the improbable case that it has
to sleep, it doesn't need to sleep long since the standard transaction
timeout is 100ms.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:34:14 +02:00
Stefan Richter
611aa19fd6 ieee1394: safer definition of empty macros
A deactivated macro, defined as "#define foo(bar)", will result in
silent corruption if somebody forgets a semicolon after a call to foo.
Replace it by "#define foo(bar) do {} while (0)" which will reveal any
respective syntax errors.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:31:20 +02:00
Adrian Bunk
a1b3206b36 the scheduled removal of drivers/ieee1394/sbp2.c:force_inquiry_hack
This patch contains the scheduled removal of the force_inquiry_hack
module parameter.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:31:08 +02:00
Stefan Richter
e8398bb737 ieee1394: sbp2: convert sbp2util_down_timeout to waitqueue
The waitqueue API is used to replace a custom wait mechanism.  Only one
global waitqueue (instead of per-device waitqueues or completions) is
added because there is usually just one waiter.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:29:31 +02:00
Stefan Richter
6065772d54 ieee1394: sbp2: more checks of status block
- Add checks for the (very unlikely) cases that the target writes too
   little or too much status data or writes unsolicited status.
 - Indicate that these and similar conditions are unlikely().
 - Check the 'resp' and 'sbp_status' fields for possible failure status.
 - Slightly optimize access macros for the status block bitfields.
 - Unify a few related log messages.

TODO:  Check if 'src'==1, then withhold the respective ORB from reuse
until status for any subsequent ORB was received.  This is an old bug
whose fix requires more complex command queue handling.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:29:24 +02:00
Stefan Richter
3e98eab46d ieee1394: sbp2: safer initialization of status fifo
Sbp2's copy of the status fifo was cleared when management ORBs or new
command ORBs were prepared.  The latter had potential for a race
condition if the block layer's soft IRQ and the 1394 LLD's interrupt
handler ran on different CPUs.  It would also yield wrong status if a
command was completed with non-zero completion status before other
commands that had zero completion status, and no new command was
enqueued in the meantime.

Now, the status buffer is cleared right before it is written.  Thus it
ends up in the following simpler and safer access pattern:
 - sbp2_alloc_device: allocates and implicitly clears once,
 - sbp2_handle_status_write: clears, writes, and reads,
 - sbp2_query_logins, sbp2_login_device, sbp2_reconnect_device: read.
The latter three do not race with sbp2_handle_status_write because of
how the protocol works.

As a tiny optimization, the first two quadlets of the status never need
to be cleared.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:29:22 +02:00
Stefan Richter
d4018d7fa6 ieee1394: sbp2: optimize DMA direction of command ORBs
Only the driver writes ORBs, the device just reads them.  Therefore
PCI_DMA_BIDIRECTIONAL can be replaced by PCI_DMA_TODEVICE which may be
cheaper on some architectures.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:29:11 +02:00
Stefan Richter
28212767e5 ieee1394: sbp2: discard return value of sbp2_link_orb_command
Since sbp2 is at the moment unable to do anything with the return value
of sbp2_link_orb_command, just discard it.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:29:01 +02:00
Stefan Richter
cc07818912 ieee1394: sbp2: safer last_orb and next_ORB handling
The sbp2 initiator has two ways to tell a target's fetch agent about new
command ORBs:
 - Write the ORB's address to the ORB_POINTER register.  This must not
   be done while the fetch agent is active.
 - Put the ORB's address into the previously submitted ORB's next_ORB
   field and write to the DOORBELL register.  This may be done while the
   fetch agent is active or suspended.  It must not be done while the
   fetch agent is in reset state.
Sbp2 has a last_orb pointer which indicates in what way a new command
should be announced.  That pointer is concurrently accessed at various
occasions.  Furthermore, initiator and target are accessing the next_ORB
field of ORBs concurrently and asynchronously.

This patch does:
 - Protect all initiator accesses to last_orb by sbp2_command_orb_lock.
 - Add pci_dma_sync_single_for_device before a previously submitted
   ORB's next_ORB field is overwritten.
 - Insert a memory barrier between when next_ORB_lo and next_ORB_hi are
   overwritten.  Next_ORB_hi must not be updated before next_ORB_lo.
 - Remove the rather unspecific and now superfluous qualifier "volatile"
   from the next_ORB fields.
 - Add comments on how last_orb is connected with what is known about
   the target's fetch agent's state.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2006-09-17 19:19:25 +02:00
Stefan Richter
2b01b80b94 [PATCH] ieee1394: replace __inline__ by inline
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Ben Collins <bcollins@ubuntu.com>
2006-07-03 12:02:28 -04:00
Stefan Richter
31a379e106 [PATCH] ieee1394: sbp2: enable auto spin-up for Maxtor disks
At least Maxtor OneTouch III require a "start stop unit" command after
auto spin-down before the next access can proceed.  This patch activates
the responsible code in scsi_mod for all Maxtor SBP-2 disks.
https://bugzilla.novell.com/show_bug.cgi?id=183011

Maybe that should be done for all SBP-2 disks, but better be cautious.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Ben Collins <bcollins@ubuntu.com>
2006-07-03 12:01:58 -04:00
Jörn Engel
6ab3d5624e Remove obsolete #include <linux/config.h>
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
2006-06-30 19:25:36 +02:00