Commit graph

316 commits

Author SHA1 Message Date
Julia Lawall
734c299282 drivers/dma: Correct NULL test
cohd_fin has already been verified not to be NULL, so the argument to
BUG_ON cannot be true.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r@
expression *x;
expression e;
identifier l;
@@

if (x == NULL || ...) {
    ... when forall
    return ...; }
... when != goto l;
    when != x = e
    when != &x
*x == NULL
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-02-10 12:07:28 -07:00
Guennadi Liakhovetski
8f98781e0f async-tx: fix buffer submission error handling in ipu_idma.c
If submitting new buffer failed, a wrong descriptor gets completed and it
doesn't check, if a callback is at all defined, which can lead to an Oops. Fix
these bugs and make ipu_update_channel_buffer() void, because it never fails.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-02-10 12:01:06 -07:00
Yong Zhang
b953df7c70 dmaengine: correct onstack wait_queue_head declaration
Use DECLARE_WAIT_QUEUE_HEAD_ONSTACK to make lockdep happy

Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
Cc: Maciej Sosnowski <maciej.sosnowski@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-02-05 15:35:53 -07:00
Dan Williams
7e55a70c5b ioat: fix infinite timeout checking in ioat2_quiesce
Fix typo in ioat2_quiesce. check 'tmo' is zero, not 'end'.  Also applies
to 2.6.32.3

Cc: <stable@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-02-02 22:57:34 -07:00
Anatolij Gustschin
adef477268 dmaengine: fix memleak in dma_async_device_unregister
While debugging a dma driver I noticed a memleak after
unloading the driver module.

Caught by kmemleak.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-02-02 14:58:37 -07:00
Linus Torvalds
05a625486e Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx:
  drivers/dma: Correct use after free
  drivers/dma: drop unnecesary memset
  ioat2,3: put channel hardware in known state at init
  async_tx: expand async raid6 test to cover ioatdma corner case
  ioat3: fix p-disabled q-continuation
  sh: fix DMA driver's descriptor chaining and cookie assignment
  dma: at_hdmac: correct incompatible type for argument 1 of 'spin_lock_bh'
2009-12-30 13:46:29 -08:00
Dan Williams
f80ca163d6 Merge branch 'ioat' into fixes 2009-12-22 17:21:47 -07:00
Julia Lawall
0794ec8ce3 drivers/dma: Correct use after free
Move the kfree after the iounmap that refers to the same structure.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x,e;
identifier f;
iterator I;
statement S;
@@

*kfree(x);
... when != &x
    when != x = e
    when != I(x,...) S
*x->f
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-12-22 15:30:08 -07:00
Julia Lawall
1e9d1b13ef drivers/dma: drop unnecesary memset
memset of 0 is not needed after kzalloc

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x;
statement S;
@@

x = kzalloc(...);
if (x == NULL) S
... when != x
-memset(x,0,...);// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-12-22 15:29:05 -07:00
Dan Williams
a6d52d7067 ioat2,3: put channel hardware in known state at init
Put the ioat2 and ioat3 state machines in the halted state with all
errors cleared.

The ioat1 init path is not disturbed for stability, there are no
reported ioat1 initiaization issues.

Cc: <stable@kernel.org>
Reported-by: Roland Dreier <rdreier@cisco.com>
Tested-by: Roland Dreier <rdreier@cisco.com>
Acked-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-12-19 15:36:02 -07:00
Dan Williams
cd78809f61 ioat3: fix p-disabled q-continuation
When continuing a pq calculation the driver needs 3 extra sources.  The
driver can perform a 3 source calculation with a single descriptor, but
needs an extended descriptor to process up to 8 sources in one
operation.  However, in the p-disabled case only one extra source is
needed.  When continuing a p-disabled operation there are occasions
(i.e. 0 < src_cnt % 8 < 3) where the tail operation does not need an
extended descriptor.  Properly account for this fact otherwise invalid
'dmacount' values will be written to hardware usually causing the
channel to halt with 'invalid descriptor' errors.

Cc: <stable@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-12-17 13:52:39 -07:00
Guennadi Liakhovetski
3542a113ab sh: fix DMA driver's descriptor chaining and cookie assignment
The SH DMA driver wrongly assigns negative cookies to transfer descriptors,
also, its chaining of partial descriptors is broken. The latter problem is
usually invisible, because maximum transfer size per chunk is 16M, but if you
artificially set this limit lower, the driver fails. Since cookies are also
used in chunk management, both these problems are fixed in one patch. As side
effects a possible memory leak, when descriptors are prepared, but not
submitted, and multiple races have also been fixed.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-12-17 09:41:39 -07:00
Linus Torvalds
7949456b1b Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx:
  ppc440spe-adma: adds updated ppc440spe adma driver
  iop-adma.c: use resource_size()
  dmaengine: clarify the meaning of the DMA_CTRL_ACK flag
  sh: stylistic improvements for the DMA driver
  dmaengine: fix dmatest to verify minimum transfer length and test buffer size
  sh: DMA driver has to specify its alignment requirements
  Add COH 901 318 DMA block driver v5
2009-12-16 10:28:56 -08:00
Nicolas Ferre
4297a462f4 dma: at_hdmac: correct incompatible type for argument 1 of 'spin_lock_bh'
Correct a typo error in locking calls.

Cc: <stable@kernel.org>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-12-16 11:21:48 -07:00
Alexey Dobriyan
471452104b const: constify remaining dev_pm_ops
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-15 08:53:25 -08:00
Linus Torvalds
d0316554d3 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: (34 commits)
  m68k: rename global variable vmalloc_end to m68k_vmalloc_end
  percpu: add missing per_cpu_ptr_to_phys() definition for UP
  percpu: Fix kdump failure if booted with percpu_alloc=page
  percpu: make misc percpu symbols unique
  percpu: make percpu symbols in ia64 unique
  percpu: make percpu symbols in powerpc unique
  percpu: make percpu symbols in x86 unique
  percpu: make percpu symbols in xen unique
  percpu: make percpu symbols in cpufreq unique
  percpu: make percpu symbols in oprofile unique
  percpu: make percpu symbols in tracer unique
  percpu: make percpu symbols under kernel/ and mm/ unique
  percpu: remove some sparse warnings
  percpu: make alloc_percpu() handle array types
  vmalloc: fix use of non-existent percpu variable in put_cpu_var()
  this_cpu: Use this_cpu_xx in trace_functions_graph.c
  this_cpu: Use this_cpu_xx for ftrace
  this_cpu: Use this_cpu_xx in nmi handling
  this_cpu: Use this_cpu operations in RCU
  this_cpu: Use this_cpu ops for VM statistics
  ...

Fix up trivial (famous last words) global per-cpu naming conflicts in
	arch/x86/kvm/svm.c
	mm/slab.c
2009-12-14 09:58:24 -08:00
Anatolij Gustschin
12458ea06e ppc440spe-adma: adds updated ppc440spe adma driver
This patch adds new version of the PPC440SPe ADMA driver.

Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-12-11 21:24:44 -07:00
H Hartley Sweeten
2e032b62c4 iop-adma.c: use resource_size()
The size of the requested and ioremaped memory is off by 1.
Use resource_size() to get the correct value.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-12-11 21:24:33 -07:00
Guennadi Liakhovetski
86d61b33e4 sh: stylistic improvements for the DMA driver
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-12-10 23:32:09 -07:00
Guennadi Liakhovetski
cfe4f2751e dmaengine: fix dmatest to verify minimum transfer length and test buffer size
Transfers and the test buffer have to be at least align bytes long.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-12-10 23:27:51 -07:00
Guennadi Liakhovetski
ddb4f0f0e0 sh: DMA driver has to specify its alignment requirements
The SH DMA driver by default uses 32-byte transfers, in this mode buffers and
sizes have to be 32-byte aligned. Specifying this requirement also fixes Oopses
with dmatest.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-12-10 23:25:58 -07:00
Linus Torvalds
4ef58d4e2a Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (42 commits)
  tree-wide: fix misspelling of "definition" in comments
  reiserfs: fix misspelling of "journaled"
  doc: Fix a typo in slub.txt.
  inotify: remove superfluous return code check
  hdlc: spelling fix in find_pvc() comment
  doc: fix regulator docs cut-and-pasteism
  mtd: Fix comment in Kconfig
  doc: Fix IRQ chip docs
  tree-wide: fix assorted typos all over the place
  drivers/ata/libata-sff.c: comment spelling fixes
  fix typos/grammos in Documentation/edac.txt
  sysctl: add missing comments
  fs/debugfs/inode.c: fix comment typos
  sgivwfb: Make use of ARRAY_SIZE.
  sky2: fix sky2_link_down copy/paste comment error
  tree-wide: fix typos "couter" -> "counter"
  tree-wide: fix typos "offest" -> "offset"
  fix kerneldoc for set_irq_msi()
  spidev: fix double "of of" in comment
  comment typo fix: sybsystem -> subsystem
  ...
2009-12-09 19:43:33 -08:00
Jiri Kosina
d014d04386 Merge branch 'for-next' into for-linus
Conflicts:

	kernel/irq/chip.c
2009-12-07 18:36:35 +01:00
Russell King
e28edb723e Merge branches 'at91', 'ep93xx', 'etm', 'ks8695', 'nuc', 'u300' and 'u8500' into devel 2009-12-05 10:35:18 +00:00
André Goddard Rosa
af901ca181 tree-wide: fix assorted typos all over the place
That is "success", "unknown", "through", "performance", "[re|un]mapping"
, "access", "default", "reasonable", "[con]currently", "temperature"
, "channel", "[un]used", "application", "example","hierarchy", "therefore"
, "[over|under]flow", "contiguous", "threshold", "enough" and others.

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-12-04 15:39:55 +01:00
Dan Williams
56adf7e812 shdma: fix initialization error handling
1/ Error handling code following a kzalloc should free the allocated data.
2/ Report an error when no platform data is detected

Both problems fixed by moving the platform data check before the allocation,
and allows a goto to be killed.

Reported-by: Julia Lawall <julia@diku.dk>
Acked-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-11-22 12:10:10 -07:00
Linus Walleij
61f135b92f Add COH 901 318 DMA block driver v5
This patch adds support for the ST-Ericsson COH 901 318 DMA block,
found in the U300 series platforms. It registers a DMA slave for
device I/O and also a memcpy slave for memcpy.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-11-19 23:45:19 -07:00
Dan Williams
49954c1567 ioat3: fix pq completion versus channel deallocation race
The completion of a pq operation is notified with a null descriptor
appended to the end of the chain.  This descriptor needs to be visible
to dma clients otherwise the client is precluded from ensuring all
operations are quiesced before freeing channel resources, i.e. due to
descriptor polling it may get the completion notification ahead of the
interrupt delivered by the null descriptor.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-11-19 23:21:03 -07:00
Dan Williams
7b3cc2b1fc async_tx: build-time toggling of async_{syndrome,xor}_val dma support
ioat3.2 does not support asynchronous error notifications which makes
the driver experience latencies when non-zero pq validate results are
expected.  Provide a mechanism for turning off async_xor_val and
async_syndrome_val via Kconfig.  This approach is generally useful for
any driver that specifies ASYNC_TX_DISABLE_CHANNEL_SWITCH and would like
to force the async_tx api to fall back to the synchronous path for
certain operations.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-11-19 23:21:03 -07:00
Dan Williams
4499a24dec dmaengine: include xor/pq validate in device_has_all_tx_types()
A channel must include these capabilities to satisfy
ASYNC_TX_DISABLE_CHANNEL_SWITCH.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-11-19 23:21:03 -07:00
Dan Williams
b57014def9 ioat2,3: report all uncorrectable errors
Modify is_ioat_bug() to catch all errors that are uncorrectable, or not
currently handled.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-11-19 23:21:03 -07:00
Dan Williams
de581b65f6 ioat3: specify valid address for disabled-Q or disabled-P
Although disabled, hardware still checks address validity, so duplicate
the known address.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-11-19 17:08:45 -07:00
Dan Williams
6f82b83b7a ioat2,3: disable asynchronous error notifications
Error interrupts and error completions may cause channel hangs, so
poll the channel status register after a timeout.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-11-19 17:07:57 -07:00
Dan Williams
228c4f5cfb ioat3: dca and raid operations are incompatible
RAID operations cause a system hang on platforms with DCA
(Direct-Cache-Access) enabled.  So turn off RAID capabilities in this
case.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-11-19 17:07:10 -07:00
Dan Williams
e22dde9904 ioat: silence "dca disabled" messages
Turning off dca is not an "error", and the dca-enabled state can be
viewed from sysfs.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-11-17 11:34:31 -07:00
Yegor Yefremov
cd3abf98ae ARM: 5770/1: Add DMA Engine support to at91sam9g45
Add at91sam9g45 dependency to drivers/dma/Kconfig

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-10-25 16:00:34 +00:00
Christoph Lameter
e7dcaa4755 this_cpu: Eliminate get/put_cpu
There are cases where we can use this_cpu_ptr and as the result
of using this_cpu_ptr() we no longer need to determine the
currently executing cpu.

In those places no get/put_cpu combination is needed anymore.
The local cpu variable can be eliminated.

Preemption still needs to be disabled and enabled since the
modifications of the per cpu variables is not atomic. There may
be multiple per cpu variables modified and those must all
be from the same processor.

Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Tejun Heo <tj@kernel.org>
cc: Eric Biederman <ebiederm@aristanetworks.com>
cc: Stephen Hemminger <shemminger@vyatta.com>
cc: David L Stevens <dlstevens@us.ibm.com>
Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
2009-10-03 19:48:23 +09:00
NeilBrown
4b3df5668c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx into for-linus 2009-09-23 18:31:11 +10:00
Dan Williams
cdef57dbb6 ioat3: fix uninitialized var warnings
drivers/dma/ioat/dma_v3.c: In function 'ioat3_prep_memset_lock':
drivers/dma/ioat/dma_v3.c:439: warning: 'fill' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c:437: warning: 'desc' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c: In function '__ioat3_prep_xor_lock':
drivers/dma/ioat/dma_v3.c:489: warning: 'xor' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c:486: warning: 'desc' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c: In function '__ioat3_prep_pq_lock':
drivers/dma/ioat/dma_v3.c:631: warning: 'pq' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c:628: warning: 'desc' may be used uninitialized in this function

gcc-4.0, unlike gcc-4.3, does not see that these variables are
initialized before use.  Convert the descriptor loops to do-while make
this initialization apparent.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-09-21 09:22:29 -07:00
Andrew Morton
f477f5b331 drivers/dma/ioat/dma_v2.c: fix warnings
drivers/dma/ioat/dma_v2.c: In function 'ioat2_dma_prep_memcpy_lock':
drivers/dma/ioat/dma_v2.c:680: warning: 'hw' may be used uninitialized in this function
drivers/dma/ioat/dma_v2.c:681: warning: 'desc' may be used uninitialized in this function

Cc: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-09-21 09:17:58 -07:00
Dan Williams
376ec37667 ioat2: clarify ring size limits
With the addition of ioat_max_alloc_order it is not clear what the
maximum allocation order is, so document that in the modinfo.  Also take
an opportunity to kill a stray semicolon.

Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-09-16 15:16:50 -07:00
Dan Williams
33f82d141c at_hdmac: Rework suspend_late()/resume_early()
This patch reworks platform driver power management code
for at_hdmac from legacy late/early callbacks to dev_pm_ops.

The callbacks are converted for CONFIG_SUSPEND like this:
  suspend_late() -> suspend_noirq()
  resume_early() -> resume_noirq()

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2009-09-14 20:27:00 +02:00
Dan Williams
3208ca52f3 ioat: driver version 4.0
A new ring implementation and the addition of raid functionality
constitutes a bump in the driver major version number.

Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-09-10 11:27:36 -07:00
Maciej Sosnowski
1a5aeeecd5 dca: registering requesters in multiple dca domains
This patch enables DCA support on multiple-IOH/multiple-IIO architectures.
It modifies dca module by replacing single dca_providers list
with dca_domains list, each domain containing separate list of providers.
This approach lets dca driver manage multiple domains, i.e. sets of providers
and requesters mapped back to the same PCI root complex device.
The driver takes care to register each requester to a provider
from the same domain.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
2009-09-10 10:00:05 -07:00
Dan Williams
9a8de639f3 async_tx: remove HIGHMEM64G restriction
This restriction prevented ASYNC_TX_DMA from being enabled on platform
configurations where DMA address conversion could not be performed in
place on the stack.  Since commit 04ce9ab3 ("async_xor: permit callers
to pass in a 'dma/page scribble' region") the async_tx api now either
uses a caller provided 'scribble' buffer, or performs the conversion in
place when sizeof(dma_addr_t) <= sizeof(struct page *).

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-09-08 17:56:37 -07:00
Nobuhiro Iwamatsu
d8902adcc1 dmaengine: sh: Add Support SuperH DMA Engine driver
This supported all DMA channels, and it was tested in SH7722,
SH7780, SH7785 and SH7763.
This can not use with SH DMA API.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Reviewed-by: Matt Fleming <matt@console-pimps.org>
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-09-08 17:56:02 -07:00
Dan Williams
bbb20089a3 Merge branch 'dmaengine' into async-tx-next
Conflicts:
	crypto/async_tx/async_xor.c
	drivers/dma/ioat/dma_v2.h
	drivers/dma/ioat/pci.c
	drivers/md/raid5.c
2009-09-08 17:55:21 -07:00
Dan Williams
3e48e65690 Merge branch 'iop-raid6' into async-tx-next 2009-09-08 17:53:57 -07:00
Atsushi Nemoto
657a77fa72 dmaengine: Move all map_sg/unmap_sg for slave channel to its client
Dan Williams wrote:
... DMA-slave clients request specific channels and know the hardware
details at a low level, so it should not be too high an expectation to
push dma mapping responsibility to the client.

Also this patch includes DMA_COMPL_{SRC,DEST}_UNMAP_SINGLE support for
dw_dmac driver.

Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-09-08 17:53:05 -07:00
Ira Snyder
bbea0b6e0d fsldma: Add DMA_SLAVE support
Use the DMA_SLAVE capability of the DMAEngine API to copy/from a
scatterlist into an arbitrary list of hardware address/length pairs.

This allows a single DMA transaction to copy data from several different
devices into a scatterlist at the same time.

This also adds support to enable some controller-specific features such as
external start and external pause for a DMA transaction.

[dan.j.williams@intel.com: rebased on tx_list movement]
Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Acked-by: Li Yang <leoli@freescale.com>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-09-08 17:53:04 -07:00