"bootable" should be the default behavior so replace
IDE_HFLAG_BOOTABLE host flag with IDE_HFLAG_NON_BOOTABLE.

There should be no functional changes caused by this patch.
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Return error value in qd_probe() and use it in qd65xx_init()
instead of checking ide_hwifs[].chipset.
Acked-by: NSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Acked-by: NSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Replace 'unsigned char hwif_id' by 'ide_hwif_t *hwif' in struct scc_ports.
This allows us to remove ide_hwifs[] usage from scc_remove().

There should be no functional changes caused by this patch.
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

* Pass 'ide_drive_t *drive' to check_prefetch(), set_prefetch_mode(),
  program_drive_counts() and cmd640_set_mode().

* Remove no longer needed cmd_drives[].

* Inline setup_device_ptrs() helper in cmd640x_init().
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

There should be no functional changes caused by this patch.

Cc: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Cc: Akira Iguchi <akira2.iguchi@toshiba.co.jp>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

There should be no functional changes caused by this patch.
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

* Dynamically allocate struct pmac_ide_hwif instances in pmac_ide_macio_attach()
  and pmac_ide_pci_attach(), then remove no longer needed pmac_ide[].

v2:
* Build fix from Kamalesh Babulal.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Cc: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Remove no longer needed matching against I/O base and 'base' argument.
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

* Remove no longer needed matching against I/O base and 'io_base' argument.

* Move printk() to the caller and remove 'name' argument.
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

This function didn't actually check if a given BAR is in I/O space because of
using the bogus PCI_BASE_ADDRESS_IO_MASK (which equals ~3) to test the resource
flags instead of IORESOURCE_IO -- fix this, make ide_hwif_configure() check the
results failing if necessary, and move the printk() call to the failure path.
Signed-off-by: NSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

The 4drives should be a tristate, the following breakage occurs otherwise:

ERROR: "probe_4drives" [drivers/ide/ide-core.ko] undefined!

The following (compile tested) patch fixes it for me.
Signed-off-by: NFrederik Deweerdt <frederik.deweerdt@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Currently the kernel will issue the following warning:
drivers/ieee1394/raw1394.c:2938: warning: 'raw1394_id_table' defined but not used
Add #ifdef MODULE guards around the declaration.
Signed-off-by: NTony Breeds <tony@bakeyournoodle.com>

Ditto with dv1394_id_table and video1394_id_table.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

As it seems, some host controllers have issues that can cause them to
skip cycles now and then when using large packets. I suspect that this
is due to DMA not succeeding in time. If the transmit fifo can't contain
more than one packet (big packets), the DMA should provide a new packet
each cycle (125us). I am under the impression that my current PCI
express test system can't guarantee this.

In any case, the patch tries to provide a workaround as follows:
The DMA program descriptors are modified such that when an error occurs,
the DMA engine retries the descriptor the next cycle instead of
stalling. This way no data is lost. The side effect of this is that
packets are sent with one cycle delay. This however might not be that
much of a problem for certain protocols (e.g. AM824). If they use
padding packets for e.g. rate matching they can drop one of those to
resync the streams.

The amount of skips between two userspace wakeups is counted. This
number is then propagated to userspace through the upper 16 bits of the
'dropped' parameter. This allows unmodified userspace applications due
to the following:
1) libraw simply passes this dropped parameter to the user application
2) the meaning of the dropped parameter is: if it's nonzero, something
bad has happened. The actual value of the parameter at this moment does
not have a specific meaning.

A libraw client can then retrieve the number of skipped cycles and
account for them if needed.
Signed-off-by: NPieter Palmers <pieterp@joow.be>
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

The small patch below:
- Removes the unused md argument from both specific_minor() and next_free_minor()
- Folds kmalloc + memset(0) into a single kzalloc call in alloc_dev()

This has been compile tested on x86.
Signed-off-by: NFrederik Deweerdt <frederik.deweerdt@gmail.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

dm_create_error_table() was added in kernel 2.6.18 and never used...
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

void returning functions returned the return value of another void
returning function...

Spotted by sparse.
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Remove an avoidable 3ms delay on some dm-raid1 and kcopyd I/O.

It is specified that any submitted bio without BIO_RW_SYNC flag may plug the
queue (i.e. block the requests from being dispatched to the physical device).

The queue is unplugged when the caller calls blk_unplug() function. Usually, the
sequence is that someone calls submit_bh to submit IO on a buffer. The IO plugs
the queue and waits (to be possibly joined with other adjacent bios). Then, when
the caller calls wait_on_buffer(), it unplugs the queue and submits the IOs to
the disk.

This was happenning:

When doing O_SYNC writes, function fsync_buffers_list() submits a list of
bios to dm_raid1, the bios are added to dm_raid1 write queue and kmirrord is
woken up.

fsync_buffers_list() calls wait_on_buffer().  That unplugs the queue, but
there are no bios on the device queue as they are still in the dm_raid1 queue.

wait_on_buffer() starts waiting until the IO is finished.

kmirrord is scheduled, kmirrord takes bios and submits them to the devices.

The submitted bio plugs the harddisk queue but there is no one to unplug it.
(The process that called wait_on_buffer() is already sleeping.)

So there is a 3ms timeout, after which the queues on the harddisks are
unplugged and requests are processed.

This 3ms timeout meant that in certain workloads (e.g. O_SYNC, 8kb writes),
dm-raid1 is 10 times slower than md raid1.

Every time we submit something asynchronously via dm_io, we must unplug the
queue actually to send the request to the device.

This patch adds an unplug call to kmirrord - while processing requests, it keeps
the queue plugged (so that adjacent bios can be merged); when it finishes
processing all the bios, it unplugs the queue to submit the bios.

It also fixes kcopyd which has the same potential problem. All kcopyd requests
are submitted with BIO_RW_SYNC.
Signed-off-by: NMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
Acked-by: NJens Axboe <jens.axboe@oracle.com>

This patch replaces the schedule() in the main kmirrord thread with a timer.
The schedule() could introduce an unwanted delay when work is ready to be
processed.

The code instead calls wake() when there's work to be done immediately, and
delayed_wake() after a failure to give a short delay before retrying.
Signed-off-by: NMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Publish the dm-io, dm-log and dm-kcopyd headers in include/linux.
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Rename kcopyd.[ch] to dm-kcopyd.[ch].
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Make dm.h macros and inlines available in include/linux/device-mapper.h
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Remove client counting code that is no longer needed.

Initialization and destruction is made globally from dm_init and dm_exit and is
not based on client counts. Initialization allocates only one empty slab cache,
so there is no negative impact from performing the initialization always,
regardless of whether some client uses kcopyd or not.
Signed-off-by: NMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Change the global mempool in kcopyd into a per-device mempool to avoid
deadlock possibilities.
Signed-off-by: NMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Make one kcopyd thread per device.

The original shared kcopyd could deadlock.

Configuration:

Remove internal module reference fields from the interface.
Signed-off-by: NJonathan Brassow <jbrassow@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Reorder a couple of functions in the file so the next patch is readable.
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Clean up the dm-log interface to prepare for publishing it in include/linux.
Signed-off-by: NHeinz Mauelshagen <hjm@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Clean up the kcopyd interface to prepare for publishing it in include/linux.
Signed-off-by: NHeinz Mauelshagen <hjm@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Clean up the dm-io interface to prepare for publishing it in include/linux.
Signed-off-by: NHeinz Mauelshagen <hjm@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Rename 'error' to 'error_bits' for clarity.
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Save pointer to dm_target in dm_snapshot structure.
Signed-off-by: NMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Move the dirty region log code into a separate module so
other targets can share the code.
Signed-off-by: NHeinz Mauelshagen <hjm@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>