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1. We don't need to round the SBP-2 segment size limit down to a
multiple of 4 kB (0xffff -> 0xf000). It is only necessary to
ensure quadlet alignment (0xffff -> 0xfffc).
2. Use dma_set_max_seg_size() to tell the DMA mapping infrastructure
and the block IO layer about the restriction. This way we can
remove the size checks and segment splitting in the queuecommand
path.
This assumes that no other code in the ieee1394 stack uses
dma_map_sg() with conflicting requirements. It furthermore assumes
that the controller device's platform actually allows us to set the
segment size to our liking. Assert the latter with a BUG_ON().
3. Also use blk_queue_max_segment_size() to tell the block IO layer
about it. It cannot know it because our scsi_add_host() does not
point to the FireWire controller's device.
We can also uniformly use dma_map_sg() for the single segment case just
like for the multi segment case, to further simplify the code.
Also clean up how the page table is converted to big endian.
Thanks to Grant Grundler and FUJITA Tomonori for advice.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Two dma_sync_single_for_cpu() were called in the wrong place.
Luckily they were merely for DMA_TO_DEVICE, hence nobody noticed.
Also reorder the matching dma_sync_single_for_device() a little bit
so that they reside in the same functions as their counterparts.
This also avoids syncing the s/g table for requests which don't use it.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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sbp2 was too quick to report .update() to the ieee1394 core as failed.
(Logged as "Failed to reconnect to sbp2 device!".) The core would then
unbind sbp2 from the device.
This is not justified if the .update() failed because another bus reset
happened. We check this and tell the ieee1394 that .update() succeeded,
and the core will call sbp2's .update() for the new bus reset as well.
This improves reconnection/re-login especially on buses with several
disks as they may issue bus resets in close succession when they come
online.
Tested by Damien Benoist.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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This instructs sd_mod to send START STOP UNIT on suspend and resume,
and on driver unbinding or unloading (including when the system is shut
down).
We don't do this though if multiple initiators may log in to the target.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Reported by Tino Keitel: PL-3507 with firmware from Prolific does not
spin down the disk on START STOP UNIT with power condition = 0 and start
= 0. It does however work with power condition = 2 or 3.
Also found while investigating this: DViCO Momobay CX-1 and FX-3A (TI
TSB42AA9/A based) become unresponsive after START STOP UNIT with power
condition = 0 and start = 0. They stay responsive if power condition is
set when stopping the motor.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Boaz Harrosh wrote:
> cmd->cmd_len is now guarantied to be set properly at all cases.
> And some commands you want to support will not be set correctly
> by COMMAND_SIZE().
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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__FUNCTION__ is gcc-specific, use __func__
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Fix I/O errors due to SYM13FW500's inability to handle larger request
sizes. Reported by Piergiorgio Sartor <piergiorgio.sartor@nexgo.de> for
firewire-sbp2 in https://bugzilla.redhat.com/show_bug.cgi?id=436879
This fix is necessary because sbp2's default request size limit has been
lifted since 2.6.25-rc1.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
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rescan-scsi-bus used to add SBP-2 targets which weren't there.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Add the same workaround as found in fw-sbp2 for feature parity and
compatibility of the workarounds module parameter.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
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sg_dma_len(sg) is invalid before the s/g list is DMA-mapped.
This fixes a post 2.6.24 regression which prevents access to SBP-2
devices on several architectures, introduced by "ieee1394: sbp2: s/g
list access cosmetics", commit 825f1df545ab0289185373b0eaf06fb0b3487422.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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This patch speeds up sbp2 a little bit --- but more importantly, it
brings the behavior of sbp2 and fw-sbp2 closer to each other. Like
fw-sbp2, sbp2 now does not limit the size of single transfers to 255
sectors anymore, unless told so by a blacklist flag or by module load
parameters.
Only very old bridge chips have been known to need the 255 sectors
limit, and we have got one such chip in our hardwired blacklist. There
certainly is a danger that more bridges need that limit; but I prefer to
have this issue present in both fw-sbp2 and sbp2 rather than just one of
them.
An OXUF922 with 400GB 7200RPM disk on an S400 controller is sped up by
this patch from 22.9 to 23.5 MB/s according to hdparm. The same effect
could be achieved before by setting a higher max_sectors module
parameter. On buses which use 1394b beta mode, sbp2 and fw-sbp2 will
now achieve virtually the same bandwidth. Fw-sbp2 only remains faster
on 1394a buses due to fw-core's gap count optimization.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Replace sg->length by sg_dma_len(sg). Rename a variable for shorter
line lengths and eliminate some superfluous local variables.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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This patch relaxes the default SCSI DMA alignment from 512 bytes to 4
bytes. I remember from previous discussions that usb and firewire have
sector size alignment requirements, so I upped their alignments in the
respective slave allocs.
The reason for doing this is so that we don't get such a huge amount of
copy overhead in bio_copy_user() for udev. (basically all inquiries it
issues can now be directly mapped).
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
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Not architecture specific code should not #include <asm/scatterlist.h>.
This patch therefore either replaces them with
#include <linux/scatterlist.h> or simply removes them if they were
unused.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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sbp2_host_reset and sbp2_handle_status_write are not serialized against
sbp2_alloc_device and sbp2_remove_device.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Bug found by Olaf Hering <olh@suse.de>:
sbp2util_remove_command_orb_pool requires a valid lu->hi pointer.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Revert commit 0555659d63c285ceb7ead3115532e1b71b0f27a7 from 2.6.22-rc1.
The dma_set_mask call somehow failed on a PowerMac G5, PPC64:
http://lkml.org/lkml/2007/8/1/344
Should there ever occur a DMA mapping beyond the physical DMA range, a
proper SBP-2 firmware will report transport errors. So let's leave it
at that.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Tested-by: Olaf Hering <olh@suse.de>
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* master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (166 commits)
[SCSI] ibmvscsi: convert to use the data buffer accessors
[SCSI] dc395x: convert to use the data buffer accessors
[SCSI] ncr53c8xx: convert to use the data buffer accessors
[SCSI] sym53c8xx: convert to use the data buffer accessors
[SCSI] ppa: coding police and printk levels
[SCSI] aic7xxx_old: remove redundant GFP_ATOMIC from kmalloc
[SCSI] i2o: remove redundant GFP_ATOMIC from kmalloc from device.c
[SCSI] remove the dead CYBERSTORMIII_SCSI option
[SCSI] don't build scsi_dma_{map,unmap} for !HAS_DMA
[SCSI] Clean up scsi_add_lun a bit
[SCSI] 53c700: Remove printk, which triggers because of low scsi clock on SNI RMs
[SCSI] sni_53c710: Cleanup
[SCSI] qla4xxx: Fix underrun/overrun conditions
[SCSI] megaraid_mbox: use mutex instead of semaphore
[SCSI] aacraid: add 51245, 51645 and 52245 adapters to documentation.
[SCSI] qla2xxx: update version to 8.02.00-k1.
[SCSI] qla2xxx: add support for NPIV
[SCSI] stex: use resid for xfer len information
[SCSI] Add Brownie 1200U3P to blacklist
[SCSI] scsi.c: convert to use the data buffer accessors
...
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This is upwards compatible, except that integer values other than 0 or 1
are no longer accepted. But values like "Y", "N", "no", "nnoooh!" work
now.
Also, improve a comment on the serialize_io parameter and make the
ORB_SET_EXCLUSIVE macro ultra-safe.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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With "modprobe sbp2 long_ieee1394_id=y", the format of
/sys/bus/scsi/devices/*:*:*:*/ieee1394_id is changed from e.g.
0001041010004beb:0:0 to 0001041010004beb:00042c:0000.
The longer format fully conforms to object identifier sizes as per
SAM(-2...4) and reflects what the SAM target port identifier is meant to
contain: A Discovery ID allegedly specified by ISO/IEC 13213:1994 ---
however there is no such thing; the authors of SAM probably meant
Directory ID). Especially target nodes with multiple dynamically added
targets may use Directory IDs to persistently identify target ports.
The new format is independent of implementation details of nodemgr.
Thus the same ieee1394_id attribute format can be implemented in the new
firewire stack.
The ieee1394_id is typically used to create persistently named links in
/dev/disk/by-id.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Conflicts:
drivers/scsi/jazz_esp.c
Same changes made by both SCSI and SPARC trees: problem with UTF-8
conversion in the copyright.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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- remove the unnecessary map_single path.
- convert to use the new accessors for the sg lists and the
parameters.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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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)
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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>
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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>
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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>
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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>
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There is no emulation going on here.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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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>
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Since commit 98e238cd42be6c0852da519303cf0182690f8d9f 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>
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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>
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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>
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Merge is finished, can bring the code in readable style again.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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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>
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API conversion without change in functionality
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Move the body of a function into its only caller.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Some people actually look at those comments.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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It's OK to reorder list_del() and sbp2util_free_command_dma() here.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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"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>
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Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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It's 2^20 bit/s, not 0.001 bit.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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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>
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Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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And update and reformat remaining comments.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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