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2009-12-30Merge branch 'fixes' of ↵Linus Torvalds
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'
2009-12-22Merge branch 'ioat' into fixesDan Williams
2009-12-22drivers/dma: Correct use after freeJulia Lawall
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>
2009-12-22drivers/dma: drop unnecesary memsetJulia Lawall
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>
2009-12-19ioat2,3: put channel hardware in known state at initDan Williams
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>
2009-12-17ioat3: fix p-disabled q-continuationDan Williams
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>
2009-12-17sh: fix DMA driver's descriptor chaining and cookie assignmentGuennadi Liakhovetski
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>
2009-12-16Merge branch 'next' of ↵Linus Torvalds
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
2009-12-16dma: at_hdmac: correct incompatible type for argument 1 of 'spin_lock_bh'Nicolas Ferre
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>
2009-12-15const: constify remaining dev_pm_opsAlexey Dobriyan
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>
2009-12-14Merge branch 'for-linus' of ↵Linus Torvalds
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
2009-12-11ppc440spe-adma: adds updated ppc440spe adma driverAnatolij Gustschin
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>
2009-12-11iop-adma.c: use resource_size()H Hartley Sweeten
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>
2009-12-10sh: stylistic improvements for the DMA driverGuennadi Liakhovetski
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-12-10dmaengine: fix dmatest to verify minimum transfer length and test buffer sizeGuennadi Liakhovetski
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>
2009-12-10sh: DMA driver has to specify its alignment requirementsGuennadi Liakhovetski
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>
2009-12-09Merge branch 'for-linus' of ↵Linus Torvalds
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 ...
2009-12-07Merge branch 'for-next' into for-linusJiri Kosina
Conflicts: kernel/irq/chip.c
2009-12-05Merge branches 'at91', 'ep93xx', 'etm', 'ks8695', 'nuc', 'u300' and 'u8500' ↵Russell King
into devel
2009-12-04tree-wide: fix assorted typos all over the placeAndré Goddard Rosa
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>
2009-11-22shdma: fix initialization error handlingDan Williams
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>
2009-11-19Add COH 901 318 DMA block driver v5Linus Walleij
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>
2009-11-19ioat3: fix pq completion versus channel deallocation raceDan Williams
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>
2009-11-19async_tx: build-time toggling of async_{syndrome,xor}_val dma supportDan Williams
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>
2009-11-19dmaengine: include xor/pq validate in device_has_all_tx_types()Dan Williams
A channel must include these capabilities to satisfy ASYNC_TX_DISABLE_CHANNEL_SWITCH. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-11-19ioat2,3: report all uncorrectable errorsDan Williams
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>
2009-11-19ioat3: specify valid address for disabled-Q or disabled-PDan Williams
Although disabled, hardware still checks address validity, so duplicate the known address. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-11-19ioat2,3: disable asynchronous error notificationsDan Williams
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>
2009-11-19ioat3: dca and raid operations are incompatibleDan Williams
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>
2009-11-17ioat: silence "dca disabled" messagesDan Williams
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>
2009-10-25ARM: 5770/1: Add DMA Engine support to at91sam9g45Yegor Yefremov
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>
2009-10-03this_cpu: Eliminate get/put_cpuChristoph Lameter
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>
2009-09-23Merge branch 'next' of ↵NeilBrown
git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx into for-linus
2009-09-21ioat3: fix uninitialized var warningsDan Williams
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>
2009-09-21drivers/dma/ioat/dma_v2.c: fix warningsAndrew Morton
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>
2009-09-16ioat2: clarify ring size limitsDan Williams
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>
2009-09-14at_hdmac: Rework suspend_late()/resume_early()Dan Williams
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>
2009-09-10ioat: driver version 4.0Dan Williams
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>
2009-09-10dca: registering requesters in multiple dca domainsMaciej Sosnowski
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>
2009-09-08async_tx: remove HIGHMEM64G restrictionDan Williams
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>
2009-09-08dmaengine: sh: Add Support SuperH DMA Engine driverNobuhiro Iwamatsu
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>
2009-09-08Merge branch 'dmaengine' into async-tx-nextDan Williams
Conflicts: crypto/async_tx/async_xor.c drivers/dma/ioat/dma_v2.h drivers/dma/ioat/pci.c drivers/md/raid5.c
2009-09-08Merge branch 'iop-raid6' into async-tx-nextDan Williams
2009-09-08dmaengine: Move all map_sg/unmap_sg for slave channel to its clientAtsushi Nemoto
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>
2009-09-08fsldma: Add DMA_SLAVE supportIra Snyder
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>
2009-09-08fsldma: split apart external pause and request count featuresIra Snyder
When using the Freescale DMA controller in external control mode, both the request count and external pause bits need to be setup correctly. This was being done with the same function. The 83xx controller lacks the external pause feature, but has a similar feature called external start. This feature requires that the request count bits be setup correctly. Split the function into two parts, to make it possible to use the external start feature on the 83xx controller. Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-09-08ioat2,3: cacheline align software descriptor allocationsDan Williams
All the necessary fields for handling an ioat2,3 ring entry can fit into one cacheline. Move ->len prior to ->txd in struct ioat_ring_ent, and move allocation of these entries to a hw-cache-aligned kmem cache to reduce the number of cachelines dirtied for descriptor management. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-09-08dmaengine: kill tx_listDan Williams
The tx_list attribute of struct dma_async_tx_descriptor is common to most, but not all dma driver implementations. None of the upper level code (dmaengine/async_tx) uses it, so allow drivers to implement it locally if they need it. This saves sizeof(struct list_head) bytes for drivers that do not manage descriptors with a linked list (e.g.: ioatdma v2,3). Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-09-08txx9dmac: implement a private tx_listDan Williams
Drop txx9dmac's use of tx_list from struct dma_async_tx_descriptor in preparation for removal of this field. Cc: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-09-08at_hdmac: implement a private tx_listDan Williams
Drop at_hdmac's use of tx_list from struct dma_async_tx_descriptor in preparation for removal of this field. Cc: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>