platform/kernel/linux-starfive.git
5 years agoMerge branch 'topic/xilinx' into for-linus
Vinod Koul [Tue, 12 Mar 2019 06:35:47 +0000 (12:05 +0530)]
Merge branch 'topic/xilinx' into for-linus

5 years agoMerge branch 'topic/tegra' into for-linus
Vinod Koul [Tue, 12 Mar 2019 06:35:43 +0000 (12:05 +0530)]
Merge branch 'topic/tegra' into for-linus

5 years agoMerge branch 'topic/stm' into for-linus
Vinod Koul [Tue, 12 Mar 2019 06:35:39 +0000 (12:05 +0530)]
Merge branch 'topic/stm' into for-linus

5 years agoMerge branch 'topic/sh' into for-linus
Vinod Koul [Tue, 12 Mar 2019 06:35:35 +0000 (12:05 +0530)]
Merge branch 'topic/sh' into for-linus

5 years agoMerge branch 'topic/mv' into for-linus
Vinod Koul [Tue, 12 Mar 2019 06:34:16 +0000 (12:04 +0530)]
Merge branch 'topic/mv' into for-linus

5 years agoMerge branch 'topic/k3dma' into for-linus
Vinod Koul [Tue, 12 Mar 2019 06:34:09 +0000 (12:04 +0530)]
Merge branch 'topic/k3dma' into for-linus

5 years agoMerge branch 'topic/imx' into for-linus
Vinod Koul [Tue, 12 Mar 2019 06:34:01 +0000 (12:04 +0530)]
Merge branch 'topic/imx' into for-linus

5 years agoMerge branch 'topic/fsl' into for-linus
Vinod Koul [Tue, 12 Mar 2019 06:33:55 +0000 (12:03 +0530)]
Merge branch 'topic/fsl' into for-linus

5 years agoMerge branch 'topic/dw' into for-linus
Vinod Koul [Tue, 12 Mar 2019 06:33:47 +0000 (12:03 +0530)]
Merge branch 'topic/dw' into for-linus

5 years agoMerge branch 'topic/brcm' into for-linus
Vinod Koul [Tue, 12 Mar 2019 06:33:42 +0000 (12:03 +0530)]
Merge branch 'topic/brcm' into for-linus

5 years agodmaengine: imx-sdma: fix consistent dma test failures
Angus Ainslie (Purism) [Mon, 28 Jan 2019 16:03:23 +0000 (09:03 -0700)]
dmaengine: imx-sdma: fix consistent dma test failures

Without the copy being aligned sdma1 fails ~10% of the time

Signed-off-by: Angus Ainslie (Purism) <angus@akkea.ca>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: imx-sdma: add a test for imx8mq multi sdma devices
Angus Ainslie (Purism) [Mon, 28 Jan 2019 16:03:22 +0000 (09:03 -0700)]
dmaengine: imx-sdma: add a test for imx8mq multi sdma devices

On i.mx8mq, there are two sdma instances, and the common dma framework
will get a channel dynamically from any available sdma instance whether
it's the first sdma device or the second sdma device. Some IPs like
SAI only work with sdma2 not sdma1. To make sure the sdma channel is from
the correct sdma device, use the node pointer to match.

Signed-off-by: Angus Ainslie (Purism) <angus@akkea.ca>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Tested-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: imx-sdma: add clock ratio 1:1 check
Angus Ainslie (Purism) [Mon, 28 Jan 2019 16:03:21 +0000 (09:03 -0700)]
dmaengine: imx-sdma: add clock ratio 1:1 check

On i.mx8 mscale B0 chip, AHB/SDMA clock ratio 2:1 can't be supportted,
since SDMA clock ratio has to be increased to 250Mhz, AHB can't reach
to 500Mhz, so use 1:1 instead.

Based on NXP commit MLK-16841-1 by Robin Gong <yibin.gong@nxp.com>

Signed-off-by: Angus Ainslie (Purism) <angus@akkea.ca>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: dmatest: move test data alloc & free into functions
Alexandru Ardelean [Tue, 12 Feb 2019 15:11:39 +0000 (17:11 +0200)]
dmaengine: dmatest: move test data alloc & free into functions

This patch starts to take advantage of the `dmatest_data` struct by moving
the common allocation & free-ing bits into functions.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: dmatest: add short-hand `buf_size` var in dmatest_func()
Alexandru Ardelean [Tue, 12 Feb 2019 15:11:38 +0000 (17:11 +0200)]
dmaengine: dmatest: add short-hand `buf_size` var in dmatest_func()

This is just a cosmetic change, since this variable gets used quite a bit
inside the dmatest_func() routine.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: dmatest: wrap src & dst data into a struct
Alexandru Ardelean [Tue, 12 Feb 2019 15:11:37 +0000 (17:11 +0200)]
dmaengine: dmatest: wrap src & dst data into a struct

This change wraps the data for the source & destination buffers into a
`struct dmatest_data`. The rename patterns are:
 * src_cnt -> src->cnt
 * dst_cnt -> dst->cnt
 * src_off -> src->off
 * dst_off -> dst->off
 * thread->srcs -> src->aligned
 * thread->usrcs -> src->raw
 * thread->dsts -> dst->aligned
 * thread->udsts -> dst->raw

The intent is to make a function that moves duplicate parts of the code
into common alloc & free functions, which will unclutter the
`dmatest_func()` function.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: ioatdma: support latency tolerance report (LTR) for v3.4
Dave Jiang [Fri, 22 Feb 2019 17:00:10 +0000 (10:00 -0700)]
dmaengine: ioatdma: support latency tolerance report (LTR) for v3.4

IOATDMA 3.4 supports PCIe LTR mechanism. The registers are non-standard
PCIe LTR support. This needs to be setup in order to not suffer performance
impact and provide proper power management. The channel is set to active
when it is allocated, and to passive when it's freed.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: ioatdma: add descriptor pre-fetch support for v3.4
Dave Jiang [Fri, 22 Feb 2019 17:00:05 +0000 (10:00 -0700)]
dmaengine: ioatdma: add descriptor pre-fetch support for v3.4

Adding support for new feature on ioatdma 3.4 hardware that provides
descriptor pre-fetching in order to reduce small DMA latencies.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: ioatdma: disable DCA enabling on IOATDMA v3.4
Dave Jiang [Fri, 22 Feb 2019 16:59:59 +0000 (09:59 -0700)]
dmaengine: ioatdma: disable DCA enabling on IOATDMA v3.4

IOATDMA v3.4 does not support DCA. Disable

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: ioatdma: Add Snow Ridge ioatdma device id
Dave Jiang [Fri, 22 Feb 2019 16:59:54 +0000 (09:59 -0700)]
dmaengine: ioatdma: Add Snow Ridge ioatdma device id

Add Snowridge Xeon-D ioatdma PCI device id. Also applies for Icelake
SP Xeon. This introduces ioatdma v3.4 platform. Also bumping driver version
to 5.0 since we are adding additional code for 3.4 support.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: sprd: Change channel id to slave id for DMA cell specifier
Baolin Wang [Thu, 21 Feb 2019 05:34:41 +0000 (13:34 +0800)]
dmaengine: sprd: Change channel id to slave id for DMA cell specifier

We will describe the slave id in DMA cell specifier instead of DMA channel
id, thus we should save the slave id from DMA engine translation function,
and remove the channel id validation.

Meanwhile we do not need set default slave id in sprd_dma_alloc_chan_resources(),
remove it.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodt-bindings: dmaengine: sprd: Change channel id to slave id for DMA cell specifier
Baolin Wang [Thu, 21 Feb 2019 05:34:40 +0000 (13:34 +0800)]
dt-bindings: dmaengine: sprd: Change channel id to slave id for DMA cell specifier

For Spreadtrum DMA engine, all channels are equal, which means slave can
request any channels with setting a unique slave id to trigger this channel.

Thus we can remove the channel id from device tree to assign the channel
dynamically, moreover we should add the slave id in device tree.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: mv_xor: Use correct device for DMA API
Robin Murphy [Mon, 18 Feb 2019 18:27:06 +0000 (18:27 +0000)]
dmaengine: mv_xor: Use correct device for DMA API

Using dma_dev->dev for mappings before it's assigned with the correct
device is unlikely to work as expected, and with future dma-direct
changes, passing a NULL device may end up crashing entirely. I don't
know enough about this hardware or the mv_xor_prep_dma_interrupt()
operation to implement the appropriate error-handling logic that would
have revealed those dma_map_single() calls failing on arm64 for as long
as the driver has been enabled there, but moving the assignment earlier
will at least make the current code operate as intended.

Fixes: 22843545b200 ("dma: mv_xor: Add support for DMA_INTERRUPT")
Reported-by: John David Anglin <dave.anglin@bell.net>
Tested-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Tested-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agoDocumentation :dmaengine: clarify DMA desc. pointer after submission
Federico Vaga [Fri, 8 Feb 2019 15:30:38 +0000 (16:30 +0100)]
Documentation :dmaengine: clarify DMA desc. pointer after submission

It clarifies that the DMA description pointer returned by
`dmaengine_prep_*` function should not be used after submission.

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agoDocumentation: dmaengine: fix dmatest.rst warning
Randy Dunlap [Mon, 11 Feb 2019 06:26:53 +0000 (22:26 -0800)]
Documentation: dmaengine: fix dmatest.rst warning

Fix markup warning: insert a blank line before the hint.

Documentation/driver-api/dmaengine/dmatest.rst:63: WARNING: Unexpected indentation.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: k3dma: Add support for dma-channel-mask
Li Yu [Thu, 24 Jan 2019 20:24:20 +0000 (12:24 -0800)]
dmaengine: k3dma: Add support for dma-channel-mask

Add dma-channel-mask as a property for k3dma, it defines
available dma channels which a non-secure mode driver can use.

One sample usage of this is in Hi3660 SoC. DMA channel 0 is
reserved to lpm3, which is a coprocessor for power management. So
as a result, any request in kernel (which runs on main processor
and in non-secure mode) should start from at least channel 1.

Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: Tanglei Han <hantanglei@huawei.com>
Cc: Zhuangluan Su <suzhuangluan@hisilicon.com>
Cc: Ryan Grachek <ryan@edited.us>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: Guodong Xu <guodong.xu@linaro.org>
Cc: dmaengine@vger.kernel.org
Signed-off-by: Li Yu <liyu65@hisilicon.com>
[jstultz: Reworked to use a channel mask]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: k3dma: Delete axi_config
Li Yu [Thu, 24 Jan 2019 20:24:19 +0000 (12:24 -0800)]
dmaengine: k3dma: Delete axi_config

Axi_config controls whether DMA resources can be accessed in non-secure
mode, such as linux kernel. The register should be set by the bootloader
stage and depends on the device.

Thus, this patch removes axi_config from k3dma driver.

Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: Tanglei Han <hantanglei@huawei.com>
Cc: Zhuangluan Su <suzhuangluan@hisilicon.com>
Cc: Ryan Grachek <ryan@edited.us>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: dmaengine@vger.kernel.org
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Li Yu <liyu65@hisilicon.com>
Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
[jstultz: Minor tweaks to commit message]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: k3dma: Upgrade k3dma driver to support hisi_asp_dma hardware
Youlin Wang [Thu, 24 Jan 2019 20:24:18 +0000 (12:24 -0800)]
dmaengine: k3dma: Upgrade k3dma driver to support hisi_asp_dma hardware

On the hi3660 hardware there are two (at least) DMA controllers,
the DMA-P (Peripheral DMA) and the DMA-A (Audio DMA). The
two blocks are similar, but have some slight differences. This
resulted in the vendor implementing two separate drivers, which
after review, they have been able to condense and re-use the
existing k3dma driver.

Thus, this patch adds support for the new "hisi-pcm-asp-dma-1.0"
compatible string in the binding.

One difference with the DMA-A controller, is that it does not
need to initialize a clock. So we skip this by adding and using
soc data flags.

After above this driver will support both k3 and hisi_asp dma
hardware.

Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: Zhuangluan Su <suzhuangluan@hisilicon.com>
Cc: Ryan Grachek <ryan@edited.us>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: dmaengine@vger.kernel.org
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Youlin Wang <wwx575822@notesmail.huawei.com>
Signed-off-by: Tanglei Han <hantanglei@huawei.com>
[jstultz: Reworked to use of_match_data, commit msg improvements]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agoDocumentation: bindings: dma: Add binding for dma-channel-mask
John Stultz [Thu, 24 Jan 2019 20:24:17 +0000 (12:24 -0800)]
Documentation: bindings: dma: Add binding for dma-channel-mask

Some dma channels can be reserved for secure mode or other
hardware on the SoC, so provide a binding for a bitmask
listing the available channels for the kernel to use.

This follows the pre-existing bcm,dma-channel-mask binding.

Cc: Vinod Koul <vkoul@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Tanglei Han <hantanglei@huawei.com>
Cc: Zhuangluan Su <suzhuangluan@hisilicon.com>
Cc: Ryan Grachek <ryan@edited.us>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: dmaengine@vger.kernel.org
Cc: devicetree@vger.kernel.org
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agoDocumentation: bindings: k3dma: Extend the k3dma driver binding to support hisi-asp
Youlin Wang [Thu, 24 Jan 2019 20:24:16 +0000 (12:24 -0800)]
Documentation: bindings: k3dma: Extend the k3dma driver binding to support hisi-asp

Extend the k3dma driver binding to support hisi-asp hardware
variants.

Cc: Vinod Koul <vkoul@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Zhuangluan Su <suzhuangluan@hisilicon.com>
Cc: Tanglei Han <hantanglei@huawei.com>
Cc: Ryan Grachek <ryan@edited.us>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: dmaengine@vger.kernel.org
Cc: devicetree@vger.kernel.org
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Youlin Wang <wwx575822@notesmail.huawei.com>
Signed-off-by: Tanglei Han <hantanglei@huawei.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: fsldma: Add 64-bit I/O accessors for powerpc64
Scott Wood [Sat, 22 Dec 2018 04:34:45 +0000 (22:34 -0600)]
dmaengine: fsldma: Add 64-bit I/O accessors for powerpc64

Otherwise 64-bit PPC builds fail with undefined references
to these accessors.

Cc: Peng Ma <peng.ma@nxp.com>
Cc: Wen He <wen.he_1@nxp.com>
Fixes: 68997fff94afa (" dmaengine: fsldma: Adding macro FSL_DMA_IN/OUT implement for ARM platform")
Signed-off-by: Scott Wood <oss@buserror.net>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: bcm2835: Drop outdated comment on supported transactions
Lukas Wunner [Wed, 23 Jan 2019 08:26:00 +0000 (09:26 +0100)]
dmaengine: bcm2835: Drop outdated comment on supported transactions

Remove an outdated comment claiming the driver only supports cyclic
transactions.  The driver has been supporting other transaction types
for more than two years.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Frank Pavlic <f.pavlic@kunbus.de>
Cc: Martin Sperl <kernel@martin.sperl.org>
Cc: Florian Meier <florian.meier@koalo.de>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Florian Kauer <florian.kauer@koalo.de>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: bcm2835: Drop gratuitous list deletion
Lukas Wunner [Wed, 23 Jan 2019 08:26:00 +0000 (09:26 +0100)]
dmaengine: bcm2835: Drop gratuitous list deletion

The BCM2835 DMA driver deletes a channel from a list upon termination
without having added it to a list first.  Moreover that operation is
protected by a spinlock which isn't taken anywhere else.  These appear
to be remnants of an older version of the driver which accidentally
got mainlined.  Remove the dead code.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Frank Pavlic <f.pavlic@kunbus.de>
Cc: Martin Sperl <kernel@martin.sperl.org>
Cc: Florian Meier <florian.meier@koalo.de>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Florian Kauer <florian.kauer@koalo.de>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: bcm2835: Enforce control block alignment
Lukas Wunner [Wed, 23 Jan 2019 08:26:00 +0000 (09:26 +0100)]
dmaengine: bcm2835: Enforce control block alignment

Per section 4.2.1.1 of the BCM2835 ARM Peripherals spec, control blocks
"must start at a 256 bit aligned address":
https://www.raspberrypi.org/app/uploads/2012/02/BCM2835-ARM-Peripherals.pdf

This rule is currently satisfied only by accident because struct
bcm2835_dma_cb has a size of 256 bit and the DMA pool API happens to
allocate blocks consecutively.  It seems safer to be explicit and tell
the DMA pool allocator about the required alignment.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Frank Pavlic <f.pavlic@kunbus.de>
Cc: Martin Sperl <kernel@martin.sperl.org>
Cc: Florian Meier <florian.meier@koalo.de>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Florian Kauer <florian.kauer@koalo.de>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: bcm2835: Return void from abort of transactions
Lukas Wunner [Wed, 23 Jan 2019 08:26:00 +0000 (09:26 +0100)]
dmaengine: bcm2835: Return void from abort of transactions

bcm2835_dma_abort() returns an int but bcm2835_dma_terminate_all() (its
sole caller) does not evaluate the return value. Change the return type
to void.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Frank Pavlic <f.pavlic@kunbus.de>
Cc: Martin Sperl <kernel@martin.sperl.org>
Cc: Florian Meier <florian.meier@koalo.de>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Florian Kauer <florian.kauer@koalo.de>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: bcm2835: Fix abort of transactions
Lukas Wunner [Wed, 23 Jan 2019 08:26:00 +0000 (09:26 +0100)]
dmaengine: bcm2835: Fix abort of transactions

There are multiple issues with bcm2835_dma_abort() (which is called on
termination of a transaction):

* The algorithm to abort the transaction first pauses the channel by
  clearing the ACTIVE flag in the CS register, then waits for the PAUSED
  flag to clear.  Page 49 of the spec documents the latter as follows:

  "Indicates if the DMA is currently paused and not transferring data.
   This will occur if the active bit has been cleared [...]"
   https://www.raspberrypi.org/app/uploads/2012/02/BCM2835-ARM-Peripherals.pdf

  So the function is entering an infinite loop because it is waiting for
  PAUSED to clear which is always set due to the function having cleared
  the ACTIVE flag.  The only thing that's saving it from itself is the
  upper bound of 10000 loop iterations.

  The code comment says that the intention is to "wait for any current
  AXI transfer to complete", so the author probably wanted to check the
  WAITING_FOR_OUTSTANDING_WRITES flag instead.  Amend the function
  accordingly.

* The CS register is only read at the beginning of the function.  It
  needs to be read again after pausing the channel and before checking
  for outstanding writes, otherwise writes which were issued between
  the register read at the beginning of the function and pausing the
  channel may not be waited for.

* The function seeks to abort the transfer by writing 0 to the NEXTCONBK
  register and setting the ABORT and ACTIVE flags.  Thereby, the 0 in
  NEXTCONBK is sought to be loaded into the CONBLK_AD register.  However
  experimentation has shown this approach to not work:  The CONBLK_AD
  register remains the same as before and the CS register contains
  0x00000030 (PAUSED | DREQ_STOPS_DMA).  In other words, the control
  block is not aborted but merely paused and it will be resumed once the
  next DMA transaction is started.  That is absolutely not the desired
  behavior.

  A simpler approach is to set the channel's RESET flag instead.  This
  reliably zeroes the NEXTCONBK as well as the CS register.  It requires
  less code and only a single MMIO write.  This is also what popular
  user space DMA drivers do, e.g.:
  https://github.com/metachris/RPIO/blob/master/source/c_pwm/pwm.c

  Note that the spec is contradictory whether the NEXTCONBK register
  is writeable at all.  On the one hand, page 41 claims:

  "The value loaded into the NEXTCONBK register can be overwritten so
  that the linked list of Control Block data structures can be
  dynamically altered. However it is only safe to do this when the DMA
  is paused."

  On the other hand, page 40 specifies:

  "Only three registers in each channel's register set are directly
  writeable (CS, CONBLK_AD and DEBUG). The other registers (TI,
  SOURCE_AD, DEST_AD, TXFR_LEN, STRIDE & NEXTCONBK), are automatically
  loaded from a Control Block data structure held in external memory."

Fixes: 96286b576690 ("dmaengine: Add support for BCM2835")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: stable@vger.kernel.org # v3.14+
Cc: Frank Pavlic <f.pavlic@kunbus.de>
Cc: Martin Sperl <kernel@martin.sperl.org>
Cc: Florian Meier <florian.meier@koalo.de>
Cc: Clive Messer <clive.m.messer@gmail.com>
Cc: Matthias Reichl <hias@horus.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Florian Kauer <florian.kauer@koalo.de>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: bcm2835: Fix interrupt race on RT
Lukas Wunner [Wed, 23 Jan 2019 08:26:00 +0000 (09:26 +0100)]
dmaengine: bcm2835: Fix interrupt race on RT

If IRQ handlers are threaded (either because CONFIG_PREEMPT_RT_BASE is
enabled or "threadirqs" was passed on the command line) and if system
load is sufficiently high that wakeup latency of IRQ threads degrades,
SPI DMA transactions on the BCM2835 occasionally break like this:

ks8851 spi0.0: SPI transfer timed out
bcm2835-dma 3f007000.dma: DMA transfer could not be terminated
ks8851 spi0.0 eth2: ks8851_rdfifo: spi_sync() failed

The root cause is an assumption made by the DMA driver which is
documented in a code comment in bcm2835_dma_terminate_all():

/*
 * Stop DMA activity: we assume the callback will not be called
 * after bcm_dma_abort() returns (even if it does, it will see
 * c->desc is NULL and exit.)
 */

That assumption falls apart if the IRQ handler bcm2835_dma_callback() is
threaded: A client may terminate a descriptor and issue a new one
before the IRQ handler had a chance to run. In fact the IRQ handler may
miss an *arbitrary* number of descriptors. The result is the following
race condition:

1. A descriptor finishes, its interrupt is deferred to the IRQ thread.
2. A client calls dma_terminate_async() which sets channel->desc = NULL.
3. The client issues a new descriptor. Because channel->desc is NULL,
   bcm2835_dma_issue_pending() immediately starts the descriptor.
4. Finally the IRQ thread runs and writes BCM2835_DMA_INT to the CS
   register to acknowledge the interrupt. This clears the ACTIVE flag,
   so the newly issued descriptor is paused in the middle of the
   transaction. Because channel->desc is not NULL, the IRQ thread
   finalizes the descriptor and tries to start the next one.

I see two possible solutions: The first is to call synchronize_irq()
in bcm2835_dma_issue_pending() to wait until the IRQ thread has
finished before issuing a new descriptor. The downside of this approach
is unnecessary latency if clients desire rapidly terminating and
re-issuing descriptors and don't have any use for an IRQ callback.
(The SPI TX DMA channel is a case in point.)

A better alternative is to make the IRQ thread recognize that it has
missed descriptors and avoid finalizing the newly issued descriptor.
So first of all, set the ACTIVE flag when acknowledging the interrupt.
This keeps a newly issued descriptor running.

If the descriptor was finished, the channel remains idle despite the
ACTIVE flag being set. However the ACTIVE flag can then no longer be
used to check whether the channel is idle, so instead check whether
the register containing the current control block address is zero
and finalize the current descriptor only if so.

That way, there is no impact on latency and throughput if the client
doesn't care for the interrupt: Only minimal additional overhead is
introduced for non-cyclic descriptors as one further MMIO read is
necessary per interrupt to check for idleness of the channel. Cyclic
descriptors are sped up slightly by removing one MMIO write per
interrupt.

Fixes: 96286b576690 ("dmaengine: Add support for BCM2835")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: stable@vger.kernel.org # v3.14+
Cc: Frank Pavlic <f.pavlic@kunbus.de>
Cc: Martin Sperl <kernel@martin.sperl.org>
Cc: Florian Meier <florian.meier@koalo.de>
Cc: Clive Messer <clive.m.messer@gmail.com>
Cc: Matthias Reichl <hias@horus.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Florian Kauer <florian.kauer@koalo.de>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: fsl-edma: dma map slave device address
Laurentiu Tudor [Fri, 18 Jan 2019 10:06:23 +0000 (12:06 +0200)]
dmaengine: fsl-edma: dma map slave device address

This mapping needs to be created in order for slave dma transfers
to work on systems with SMMU. The implementation mostly mimics the
one in pl330 dma driver, authored by Robin Murphy.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Angelo Dureghello <angelo@sysam.it>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: usb-dmac: Make DMAC system sleep callbacks explicit
Phuong Nguyen [Thu, 17 Jan 2019 08:44:17 +0000 (17:44 +0900)]
dmaengine: usb-dmac: Make DMAC system sleep callbacks explicit

This commit fixes the issue that USB-DMAC hangs silently after system
resumes on R-Car Gen3 hence renesas_usbhs will not work correctly
when using USB-DMAC for bulk transfer e.g. ethernet or serial
gadgets.

The issue can be reproduced by these steps:
 1. modprobe g_serial
 2. Suspend and resume system.
 3. connect a usb cable to host side
 4. Transfer data from Host to Target
 5. cat /dev/ttyGS0 (Target side)
 6. echo "test" > /dev/ttyACM0 (Host side)

The 'cat' will not result anything. However, system still can work
normally.

Currently, USB-DMAC driver does not have system sleep callbacks hence
this driver relies on the PM core to force runtime suspend/resume to
suspend and reinitialize USB-DMAC during system resume. After
the commit 17218e0092f8 ("PM / genpd: Stop/start devices without
pm_runtime_force_suspend/resume()"), PM core will not force
runtime suspend/resume anymore so this issue happens.

To solve this, make system suspend resume explicit by using
pm_runtime_force_{suspend,resume}() as the system sleep callbacks.
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS() is used to make sure USB-DMAC
suspended after and initialized before renesas_usbhs."

Signed-off-by: Phuong Nguyen <phuong.nguyen.xw@renesas.com>
Signed-off-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Cc: <stable@vger.kernel.org> # v4.16+
[shimoda: revise the commit log and add Cc tag]
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: imx-sdma: pass ->dev to dma_alloc_coherent() API
Andy Duan [Fri, 11 Jan 2019 14:29:49 +0000 (14:29 +0000)]
dmaengine: imx-sdma: pass ->dev to dma_alloc_coherent() API

Pass ->dev to dma_alloc_coherent() API. We need this
because dma_alloc_coherent() makes use of dev parameter
and receiving NULL will result in a crash.

Signed-off-by: Andy Duan <fugang.duan@nxp.com>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Robin Gong <yibin.gong@nxp.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: imx-dma: change return of 'imxdma_sg_next' to void
Vinod Koul [Sun, 20 Jan 2019 06:12:44 +0000 (11:42 +0530)]
dmaengine: imx-dma: change return of 'imxdma_sg_next' to void

The return value of function 'imxdma_sg_next' is not checked anywhere,
so make it void return type.

Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: imx-dma: change variable 'now' type to size_t
Vinod Koul [Sun, 20 Jan 2019 06:12:44 +0000 (11:42 +0530)]
dmaengine: imx-dma: change variable 'now' type to size_t

now is used to keep size and it is better to change the variable
type to size_t

Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: imx-dma: fix warning comparison of distinct pointer types
Anders Roxell [Thu, 10 Jan 2019 11:15:35 +0000 (12:15 +0100)]
dmaengine: imx-dma: fix warning comparison of distinct pointer types

The warning got introduced by commit 930507c18304 ("arm64: add basic
Kconfig symbols for i.MX8"). Since it got enabled for arm64. The warning
haven't been seen before since size_t was 'unsigned int' when built on
arm32.

../drivers/dma/imx-dma.c: In function â€˜imxdma_sg_next’:
../include/linux/kernel.h:846:29: warning: comparison of distinct pointer types lacks a cast
   (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                             ^~
../include/linux/kernel.h:860:4: note: in expansion of macro â€˜__typecheck’
   (__typecheck(x, y) && __no_side_effects(x, y))
    ^~~~~~~~~~~
../include/linux/kernel.h:870:24: note: in expansion of macro â€˜__safe_cmp’
  __builtin_choose_expr(__safe_cmp(x, y), \
                        ^~~~~~~~~~
../include/linux/kernel.h:879:19: note: in expansion of macro â€˜__careful_cmp’
 #define min(x, y) __careful_cmp(x, y, <)
                   ^~~~~~~~~~~~~
../drivers/dma/imx-dma.c:288:8: note: in expansion of macro â€˜min’
  now = min(d->len, sg_dma_len(sg));
        ^~~

Rework so that we use min_t and pass in the size_t that returns the
minimum of two values, using the specified type.

Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: xilinx_dma: remove set but not used variable 'tail_segment'
YueHaibing [Wed, 9 Jan 2019 12:10:37 +0000 (12:10 +0000)]
dmaengine: xilinx_dma: remove set but not used variable 'tail_segment'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/dma/xilinx/xilinx_dma.c: In function 'xilinx_vdma_start_transfer':
drivers/dma/xilinx/xilinx_dma.c:1104:33: warning:
 variable 'tail_segment' set but not used [-Wunused-but-set-variable]

It not used since commit b8349172b400 ("dmaengine: xilinx_dma: Drop SG support
for VDMA IP")

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: axi-dmac: Use struct_size() in kzalloc()
Gustavo A. R. Silva [Wed, 9 Jan 2019 14:44:37 +0000 (08:44 -0600)]
dmaengine: axi-dmac: Use struct_size() in kzalloc()

One of the more common cases of allocation size calculations is finding the
size of a structure that has a zero-sized array at the end, along with memory
for some number of elements for that array. For example:

struct foo {
    int stuff;
    void *entry[];
};

instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can now
use the new struct_size() helper:

instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: timb_dma: Use struct_size() in kzalloc()
Gustavo A. R. Silva [Tue, 8 Jan 2019 15:58:52 +0000 (09:58 -0600)]
dmaengine: timb_dma: Use struct_size() in kzalloc()

One of the more common cases of allocation size calculations is finding the
size of a structure that has a zero-sized array at the end, along with memory
for some number of elements for that array. For example:

struct foo {
    int stuff;
    void *entry[];
};

instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can now
use the new struct_size() helper:

instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: tegra210-adma: Use struct_size() in devm_kzalloc()
Gustavo A. R. Silva [Mon, 7 Jan 2019 17:06:31 +0000 (11:06 -0600)]
dmaengine: tegra210-adma: Use struct_size() in devm_kzalloc()

One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct foo {
    int stuff;
    void *entry[];
};

instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:

instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agoMerge branch 'topic/qcom' into for-linus
Vinod Koul [Sun, 20 Jan 2019 05:18:05 +0000 (10:48 +0530)]
Merge branch 'topic/qcom' into for-linus

5 years agodmaengine: qcom_hidma: assign channel cookie correctly
Shunyong Yang [Mon, 7 Jan 2019 01:34:02 +0000 (09:34 +0800)]
dmaengine: qcom_hidma: assign channel cookie correctly

When dma_cookie_complete() is called in hidma_process_completed(),
dma_cookie_status() will return DMA_COMPLETE in hidma_tx_status(). Then,
hidma_txn_is_success() will be called to use channel cookie
mchan->last_success to do additional DMA status check. Current code
assigns mchan->last_success after dma_cookie_complete(). This causes
a race condition of dma_cookie_status() returns DMA_COMPLETE before
mchan->last_success is assigned correctly. The race will cause
hidma_tx_status() return DMA_ERROR but the transaction is actually a
success. Moreover, in async_tx case, it will cause a timeout panic
in async_tx_quiesce().

 Kernel panic - not syncing: async_tx_quiesce: DMA error waiting for
 transaction
 ...
 Call trace:
 [<ffff000008089994>] dump_backtrace+0x0/0x1f4
 [<ffff000008089bac>] show_stack+0x24/0x2c
 [<ffff00000891e198>] dump_stack+0x84/0xa8
 [<ffff0000080da544>] panic+0x12c/0x29c
 [<ffff0000045d0334>] async_tx_quiesce+0xa4/0xc8 [async_tx]
 [<ffff0000045d03c8>] async_trigger_callback+0x70/0x1c0 [async_tx]
 [<ffff0000048b7d74>] raid_run_ops+0x86c/0x1540 [raid456]
 [<ffff0000048bd084>] handle_stripe+0x5e8/0x1c7c [raid456]
 [<ffff0000048be9ec>] handle_active_stripes.isra.45+0x2d4/0x550 [raid456]
 [<ffff0000048beff4>] raid5d+0x38c/0x5d0 [raid456]
 [<ffff000008736538>] md_thread+0x108/0x168
 [<ffff0000080fb1cc>] kthread+0x10c/0x138
 [<ffff000008084d34>] ret_from_fork+0x10/0x18

Cc: Joey Zheng <yu.zheng@hxt-semitech.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
Signed-off-by: Shunyong Yang <shunyong.yang@hxt-semitech.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: qcom_hidma: initialize tx flags in hidma_prep_dma_*
Shunyong Yang [Mon, 7 Jan 2019 01:32:14 +0000 (09:32 +0800)]
dmaengine: qcom_hidma: initialize tx flags in hidma_prep_dma_*

In async_tx_test_ack(), it uses flags in struct dma_async_tx_descriptor
to check the ACK status. As hidma reuses the descriptor in a free list
when hidma_prep_dma_*(memcpy/memset) is called, the flag will keep ACKed
if the descriptor has been used before. This will cause a BUG_ON in
async_tx_quiesce().

  kernel BUG at crypto/async_tx/async_tx.c:282!
  Internal error: Oops - BUG: 0 1 SMP
  ...
  task: ffff8017dd3ec000 task.stack: ffff8017dd3e8000
  PC is at async_tx_quiesce+0x54/0x78 [async_tx]
  LR is at async_trigger_callback+0x98/0x110 [async_tx]

This patch initializes flags in dma_async_tx_descriptor by the flags
passed from the caller when hidma_prep_dma_*(memcpy/memset) is called.

Cc: Joey Zheng <yu.zheng@hxt-semitech.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
Signed-off-by: Shunyong Yang <shunyong.yang@hxt-semitech.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: dw-axi-dmac: Fix trivia typo
Andy Shevchenko [Tue, 8 Jan 2019 15:57:55 +0000 (17:57 +0200)]
dmaengine: dw-axi-dmac: Fix trivia typo

Field name ststus_hi should be spelled as status_hi.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: imx-sdma: refine to load context only once
Robin Gong [Tue, 8 Jan 2019 12:00:16 +0000 (12:00 +0000)]
dmaengine: imx-sdma: refine to load context only once

The context loaded only one time before channel running,but
currently sdma_config_channel() and dma_prep_* duplicated with
sdma_load_context(), so refine it to load context only one time
before channel running and reload after the channel terminated.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: fsl-edma: use struct_size() in kzalloc()
Gustavo A. R. Silva [Fri, 4 Jan 2019 21:25:45 +0000 (15:25 -0600)]
dmaengine: fsl-edma: use struct_size() in kzalloc()

One of the more common cases of allocation size calculations is finding the
size of a structure that has a zero-sized array at the end, along with memory
for some number of elements for that array. For example:

struct foo {
    int stuff;
    void *entry[];
};

instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can now
use the new struct_size() helper:

instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Tested-by: Angelo Dureghello <angelo@sysam.it>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: tegra-apb: Use struct_size() in devm_kzalloc()
Gustavo A. R. Silva [Fri, 4 Jan 2019 21:16:12 +0000 (15:16 -0600)]
dmaengine: tegra-apb: Use struct_size() in devm_kzalloc()

One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct foo {
    int stuff;
    void *entry[];
};

instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:

instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: qcom: bam_dma: use struct_size() in kzalloc()
Gustavo A. R. Silva [Fri, 4 Jan 2019 17:32:15 +0000 (11:32 -0600)]
dmaengine: qcom: bam_dma: use struct_size() in kzalloc()

One of the more common cases of allocation size calculations is finding the
size of a structure that has a zero-sized array at the end, along with memory
for some number of elements for that array. For example:

struct foo {
    int stuff;
    void *entry[];
};

instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can now
use the new struct_size() helper:

instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: st_fdma: use struct_size() in kzalloc()
Gustavo A. R. Silva [Fri, 4 Jan 2019 18:43:22 +0000 (12:43 -0600)]
dmaengine: st_fdma: use struct_size() in kzalloc()

One of the more common cases of allocation size calculations is finding the
size of a structure that has a zero-sized array at the end, along with memory
for some number of elements for that array. For example:

struct foo {
    int stuff;
    void *entry[];
};

instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can now
use the new struct_size() helper:

instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: dma-jz4780: Use struct_size() in devm_kzalloc()
Gustavo A. R. Silva [Mon, 24 Dec 2018 06:52:17 +0000 (00:52 -0600)]
dmaengine: dma-jz4780: Use struct_size() in devm_kzalloc()

One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct foo {
    int stuff;
    void *entry[];
};

instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:

instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);

This issue was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: bcm2835: Use struct_size() in kzalloc()
Gustavo A. R. Silva [Fri, 4 Jan 2019 18:30:34 +0000 (12:30 -0600)]
dmaengine: bcm2835: Use struct_size() in kzalloc()

One of the more common cases of allocation size calculations is finding the
size of a structure that has a zero-sized array at the end, along with memory
for some number of elements for that array. For example:

struct foo {
    int stuff;
    void *entry[];
};

instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can now
use the new struct_size() helper:

instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: dw: convert to SPDX identifiers
Andy Shevchenko [Mon, 7 Jan 2019 11:07:41 +0000 (13:07 +0200)]
dmaengine: dw: convert to SPDX identifiers

This patch updates license to use SPDX-License-Identifier
instead of verbose license text.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: dw: Don't pollute CTL_LO on iDMA 32-bit
Andy Shevchenko [Mon, 7 Jan 2019 11:07:40 +0000 (13:07 +0200)]
dmaengine: dw: Don't pollute CTL_LO on iDMA 32-bit

Intel iDMA 32-bit doesn't have a concept of bus masters and thus
there is no need to setup any kind of masters in the CTL_LO register.

Moreover, the burst size for memory-to-memory transfer is not what is says,
we need to have a corrected list of possible sizes. Note, that
the size of 8 items, each of that up to 4 bytes, is chosen because of
maximum of 1/2 FIFO, which is 64 bytes on Intel Merrifield.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: dw: Reset DRAIN bit when resume the channel
Andy Shevchenko [Mon, 7 Jan 2019 11:07:39 +0000 (13:07 +0200)]
dmaengine: dw: Reset DRAIN bit when resume the channel

For Intel iDMA 32-bit the channel can be drained on a suspend.
We need to reset the bit on the resume to return a status quo.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: dw: Split DW and iDMA 32-bit operations
Andy Shevchenko [Mon, 7 Jan 2019 11:07:38 +0000 (13:07 +0200)]
dmaengine: dw: Split DW and iDMA 32-bit operations

Here is a kinda big refactoring that should have been done
in the first place, when Intel iDMA 32-bit support appeared.

It splits operations which are different to Synopsys DesignWare and
Intel iDMA 32-bit controllers.

No functional change intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: dw: Remove unused internal property
Andy Shevchenko [Mon, 7 Jan 2019 11:07:37 +0000 (13:07 +0200)]
dmaengine: dw: Remove unused internal property

All known devices, which use DT for configuration, support
memory-to-memory transfers. So enable it by default.

The rest two cases, i.e. Intel Quark and PPC460ex, instantiate DMA driver and
use its channels exclusively for hardware, which means there is no available
channel for any other purposes anyway.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: dw: Remove misleading is_private property
Andy Shevchenko [Mon, 7 Jan 2019 11:07:36 +0000 (13:07 +0200)]
dmaengine: dw: Remove misleading is_private property

The commit a9ddb575d6d6

   ("dmaengine: dw_dmac: Enhance device tree support")

introduces is_private property in uncertain understanding what does it mean.

First of all, documentation defines DMA_PRIVATE capability as

Documentation/crypto/async-tx-api.txt:
  The DMA_PRIVATE capability flag is used to tag dma devices that should not be
  used by the general-purpose allocator. It can be set at initialization time
  if it is known that a channel will always be private. Alternatively,
  it is set when dma_request_channel() finds an unused "public" channel.

  A couple caveats to note when implementing a driver and consumer:
  1/ Once a channel has been privately allocated it will no longer be
     considered by the general-purpose allocator even after a call to
     dma_release_channel().
  2/ Since capabilities are specified at the device level a dma_device with
     multiple channels will either have all channels public, or all channels
     private.

Documentation/driver-api/dmaengine/provider.rst:
  - DMA_PRIVATE
    The devices only supports slave transfers, and as such isn't available
    for async transfers.

The capability had been introduced by the commit 59b5ec21446b

  ("dmaengine: introduce dma_request_channel and private channels")

and some code didn't changed from that times ever.

Taking into consideration above and the fact that on all known platforms
Synopsys DesignWare DMA engine is attached to serve slave transfers,
the DMA_PRIVATE capability must be enabled for this device unconditionally.
Otherwise, as rightfully noticed in drivers/dma/at_xdmac.c:
  /*
   * Without DMA_PRIVATE the driver is not able to allocate more than
   * one channel, second allocation fails in private_candidate.
   */
because of of a caveats mentioned in above documentation excerpts.

So, remove conditional around DMA_PRIVATE followed by removal leftovers.

If someone wonders, DMA_PRIVATE can be not used if and only if the all channels
of the DMA controller are supposed to serve memory-to-memory like operations.
For example, EP93xx has two controllers, one of which can only perform
memory-to-memory transfers

Note, this change doesn't affect dmatest to be able to test such controllers.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> (maintainer:SERIAL DRIVERS)
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: dw: Add missed multi-block support for iDMA 32-bit
Andy Shevchenko [Mon, 7 Jan 2019 11:07:35 +0000 (13:07 +0200)]
dmaengine: dw: Add missed multi-block support for iDMA 32-bit

Intel integrated DMA 32-bit support multi-block transfers.
Add missed setting to the platform data.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: xilinx_dma: Drop SG support for VDMA IP
Andrea Merello [Tue, 20 Nov 2018 15:31:51 +0000 (16:31 +0100)]
dmaengine: xilinx_dma: Drop SG support for VDMA IP

xilinx_vdma_start_transfer() is used only for VDMA IP, still it contains
conditional code on has_sg variable. has_sg is set only whenever the HW
does support SG mode, that is never true for VDMA IP.

This patch drops the never-taken branches.

Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodt-bindings: dmaengine: xilinx_dma: drop include-sg property
Andrea Merello [Tue, 20 Nov 2018 15:31:50 +0000 (16:31 +0100)]
dt-bindings: dmaengine: xilinx_dma: drop include-sg property

This property is not needed anymore, because the driver now autodetects it.
Delete references in documentation.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: xilinx_dma: autodetect whether the HW supports scatter-gather
Andrea Merello [Tue, 20 Nov 2018 15:31:49 +0000 (16:31 +0100)]
dmaengine: xilinx_dma: autodetect whether the HW supports scatter-gather

The AXIDMA and CDMA HW can be either direct-access or scatter-gather
version. These are SW incompatible.

The driver can handle both versions: a DT property was used to
tell the driver whether to assume the HW is in scatter-gather mode.

This patch makes the driver to autodetect this information. The DT
property is not required anymore.

No changes for VDMA.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: xilinx_dma: program hardware supported buffer length
Radhey Shyam Pandey [Tue, 20 Nov 2018 15:31:48 +0000 (16:31 +0100)]
dmaengine: xilinx_dma: program hardware supported buffer length

AXI-DMA IP supports configurable (c_sg_length_width) buffer length
register width, hence read buffer length (xlnx,sg-length-width) DT
property and ensure that driver doesn't program buffer length
exceeding the supported limit. For VDMA and CDMA there is no change.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Andrea Merello <andrea.merello@gmail.com> [rebase, reword]
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodt-bindings: dmaengine: xilinx_dma: add optional xlnx,sg-length-width property
Andrea Merello [Tue, 20 Nov 2018 15:31:47 +0000 (16:31 +0100)]
dt-bindings: dmaengine: xilinx_dma: add optional xlnx,sg-length-width property

The width of the "length register" cannot be autodetected, and it is now
specified with a DT property. Add documentation for it.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Reviewed-by: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: xilinx_dma: in axidma slave_sg and dma_cyclic mode align split descriptors
Andrea Merello [Tue, 20 Nov 2018 15:31:46 +0000 (16:31 +0100)]
dmaengine: xilinx_dma: in axidma slave_sg and dma_cyclic mode align split descriptors

Whenever a single or cyclic transaction is prepared, the driver
could eventually split it over several SG descriptors in order
to deal with the HW maximum transfer length.

This could end up in DMA operations starting from a misaligned
address. This seems fatal for the HW if DRE (Data Realignment Engine)
is not enabled.

This patch eventually adjusts the transfer size in order to make sure
all operations start from an aligned address.

Cc: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: xilinx_dma: commonize DMA copy size calculation
Andrea Merello [Tue, 20 Nov 2018 15:31:45 +0000 (16:31 +0100)]
dmaengine: xilinx_dma: commonize DMA copy size calculation

This patch removes a bit of duplicated code by introducing a new
function that implements calculations for DMA copy size, and
prepares for changes to the copy size calculation that will
happen in following patches.

Suggested-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: tegra: add tracepoints to driver
Ben Dooks [Wed, 21 Nov 2018 16:13:23 +0000 (16:13 +0000)]
dmaengine: tegra: add tracepoints to driver

Add some trace-points to the driver to allow for debuging via the
trace pipe.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: tegra: reduce channel name field size
Ben Dooks [Wed, 21 Nov 2018 16:13:22 +0000 (16:13 +0000)]
dmaengine: tegra: reduce channel name field size

The name field is used for "apbdma.%d" which is rarely going to be
more than 10 bytes, so reduce the size from 30 to 12. This is only
being used by the interrupt registration, so is not critical to the
operation of the driver either.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: tegra: fix incorrect case of DMA
Ben Dooks [Wed, 21 Nov 2018 16:13:21 +0000 (16:13 +0000)]
dmaengine: tegra: fix incorrect case of DMA

The use of Dma is annoying, since it is an acronym so should be all
upper case. Fix this throughout the driver.

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: tegra: make byte counters unsigned int
Ben Dooks [Wed, 21 Nov 2018 16:13:20 +0000 (16:13 +0000)]
dmaengine: tegra: make byte counters unsigned int

The buffer byte request length and counter are declared as signed integers
but the values should never be below zero, so make these unsigned integers
instead.

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: tegra: avoid overflow of byte tracking
Ben Dooks [Wed, 21 Nov 2018 16:13:19 +0000 (16:13 +0000)]
dmaengine: tegra: avoid overflow of byte tracking

The dma_desc->bytes_transferred counter tracks the number of bytes
moved by the DMA channel. This is then used to calculate the information
passed back in the in the tegra_dma_tx_status callback, which is usually
fine.

When the DMA channel is configured as continous, then the bytes_transferred
counter will increase over time and eventually overflow to become negative
so the residue count will become invalid and the ALSA sound-dma code will
report invalid hardware pointer values to the application. This results in
some users becoming confused about the playout position and putting audio
data in the wrong place.

To fix this issue, always ensure the bytes_transferred field is modulo the
size of the request. We only do this for the case of the cyclic transfer
done ISR as anyone attempting to move 2GiB of DMA data in one transfer
is unlikely.

Note, we don't fix the issue that we should /never/ transfer a negative
number of bytes so we could make those fields unsigned.

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: stm32-mdma: Add PM Runtime support
Pierre-Yves MORDRET [Thu, 3 Jan 2019 10:17:10 +0000 (11:17 +0100)]
dmaengine: stm32-mdma: Add PM Runtime support

Use pm_runtime engine for clock management purpose

Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: stm32-dmamux: Add PM Runtime support
Pierre-Yves MORDRET [Thu, 3 Jan 2019 10:17:09 +0000 (11:17 +0100)]
dmaengine: stm32-dmamux: Add PM Runtime support

Use pm_runtime engine for clock management purpose.

Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: stm32-dma: Add PM Runtime support
Pierre-Yves MORDRET [Thu, 3 Jan 2019 10:17:08 +0000 (11:17 +0100)]
dmaengine: stm32-dma: Add PM Runtime support

Use pm_runtime engine for clock management purpose.

Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: stm32-dma: check FIFO error interrupt enable
Pierre-Yves MORDRET [Thu, 3 Jan 2019 10:17:29 +0000 (11:17 +0100)]
dmaengine: stm32-dma: check FIFO error interrupt enable

For avoiding false FIFO detection, check FIFO Error interrupt is
enabled prior raising any errors.
This will prevent having spurious FIFO error where it shouldn't.

Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: stm32-mdma: Add a check on read_u32_array
Aditya Pakki [Fri, 28 Dec 2018 19:26:41 +0000 (13:26 -0600)]
dmaengine: stm32-mdma: Add a check on read_u32_array

In stm32_mdma_probe, after reading the property "st,ahb-addr-masks", the
second call is not checked for failure. This time of check to time of use
case of "count" error is sent upstream.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Acked-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: qcom_hidma: Check for driver register failure
Aditya Pakki [Fri, 28 Dec 2018 20:11:19 +0000 (14:11 -0600)]
dmaengine: qcom_hidma: Check for driver register failure

While initializing the driver, the function platform_driver_register can
fail and return an error. Consistent with other invocations, this patch
returns the error upstream.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Acked-by: Sinan Kaya <okaya@kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: mv_xor: Fix a missing check in mv_xor_channel_add
Aditya Pakki [Mon, 24 Dec 2018 17:41:54 +0000 (11:41 -0600)]
dmaengine: mv_xor: Fix a missing check in mv_xor_channel_add

dma_async_device_register() may fail and return an error. The capabilities
checked in mv_xor_channel_add() are not complete. The fix handles the
error by freeing the resources.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: fsl-qdma: add MODULE_LICENSE
Arnd Bergmann [Mon, 10 Dec 2018 20:55:02 +0000 (21:55 +0100)]
dmaengine: fsl-qdma: add MODULE_LICENSE

The newly added driver lacks a MODULE_LICENSE tag, which now produces
a warning:

WARNING: modpost: missing MODULE_LICENSE() in drivers/dma/fsl-qdma.o

Add the license according to the SPDX specifier.

Fixes: 75628c149b0d ("dmaengine: fsl-qdma: Add qDMA controller driver for Layerscape SoCs")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodt-bindings: fsl-qdma: Add NXP Layerscpae qDMA controller bindings
Peng Ma [Tue, 30 Oct 2018 02:36:04 +0000 (10:36 +0800)]
dt-bindings: fsl-qdma: Add NXP Layerscpae qDMA controller bindings

Document the devicetree bindings for NXP Layerscape qDMA controller
which could be found on NXP QorIQ Layerscape SoCs.

Signed-off-by: Wen He <wen.he_1@nxp.com>
Signed-off-by: Peng Ma <peng.ma@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: fsl-qdma: Add qDMA controller driver for Layerscape SoCs
Peng Ma [Tue, 30 Oct 2018 02:36:00 +0000 (10:36 +0800)]
dmaengine: fsl-qdma: Add qDMA controller driver for Layerscape SoCs

NXP Queue DMA controller(qDMA) on Layerscape SoCs supports channel
virtuallization by allowing DMA jobs to be enqueued into different
command queues.

Signed-off-by: Wen He <wen.he_1@nxp.com>
Signed-off-by: Jiaheng Fan <jiaheng.fan@nxp.com>
Signed-off-by: Peng Ma <peng.ma@nxp.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: fsldma: Adding macro FSL_DMA_IN/OUT implement for ARM platform
Peng Ma [Tue, 30 Oct 2018 02:35:59 +0000 (10:35 +0800)]
dmaengine: fsldma: Adding macro FSL_DMA_IN/OUT implement for ARM platform

This patch add the macro FSL_DMA_IN/OUT implement for ARM platform.

Signed-off-by: Wen He <wen.he_1@nxp.com>
Signed-off-by: Peng Ma <peng.ma@nxp.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: fsldma: Replace DMA_IN/OUT by FSL_DMA_IN/OUT
Wen He [Tue, 30 Oct 2018 02:35:58 +0000 (10:35 +0800)]
dmaengine: fsldma: Replace DMA_IN/OUT by FSL_DMA_IN/OUT

This patch implement a standard macro call functions is
used to NXP dma drivers.

Signed-off-by: Wen He <wen.he_1@nxp.com>
Signed-off-by: Peng Ma <peng.ma@nxp.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: sa11x0: drop useless LIST_HEAD
Julia Lawall [Sun, 23 Dec 2018 08:57:13 +0000 (09:57 +0100)]
dmaengine: sa11x0: drop useless LIST_HEAD

Drop LIST_HEAD where the variable it declares has never been
used.

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

// <smpl>
@@
identifier x;
@@
- LIST_HEAD(x);
  ... when != x
// </smpl>

Fixes: 4a533218fccf ("dmaengine: sa11x0: Split device_control")
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: pl330: drop useless LIST_HEAD
Julia Lawall [Sun, 23 Dec 2018 08:57:12 +0000 (09:57 +0100)]
dmaengine: pl330: drop useless LIST_HEAD

Drop LIST_HEAD where the variable it declares is never used.

The variable has not been used since the function was introduced
in 740aa95703c5 ("dmaengine: pl330: Split device_control").

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

// <smpl>
@@
identifier x;
@@
- LIST_HEAD(x);
  ... when != x
// </smpl>

Fixes: 740aa95703c5 ("dmaengine: pl330: Split device_control")
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: st_fdma: drop useless LIST_HEAD
Julia Lawall [Sun, 23 Dec 2018 08:57:09 +0000 (09:57 +0100)]
dmaengine: st_fdma: drop useless LIST_HEAD

Drop LIST_HEAD where the variable it declares is never used.

The declarations were introduced with the file, but the declared
variables were not used.

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

// <smpl>
@@
identifier x;
@@
- LIST_HEAD(x);
  ... when != x
// </smpl>

Fixes: 6b4cd727eaf1 ("dmaengine: st_fdma: Add STMicroelectronics FDMA engine driver support")
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: dw: drop useless LIST_HEAD
Julia Lawall [Sun, 23 Dec 2018 08:57:07 +0000 (09:57 +0100)]
dmaengine: dw: drop useless LIST_HEAD

Drop LIST_HEAD where the variable it declares is never used.

Commit ab703f818ac3 ("dmaengine: dw: lazy allocation of dma
descriptors") removed the uses, but not the declaration.

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

// <smpl>
@@
identifier x;
@@
- LIST_HEAD(x);
  ... when != x
// </smpl>

Fixes: ab703f818ac3 ("dmaengine: dw: lazy allocation of dma descriptors")
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agodmaengine: at_hdmac: drop useless LIST_HEAD
Julia Lawall [Sun, 23 Dec 2018 08:57:02 +0000 (09:57 +0100)]
dmaengine: at_hdmac: drop useless LIST_HEAD

Drop LIST_HEAD where the variable it declares is never used.

tmp_list has been declared since the introduction of the driver
and has never been used.  The two declarations of list were
introduced with the containing functions but were also not used.

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

// <smpl>
@@
identifier x;
@@
- LIST_HEAD(x);
  ... when != x
// </smpl>

Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller")
Fixes: 4facfe7f09f2b ("dmaengine: hdmac: Split device_control")
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
5 years agoLinux 5.0-rc1
Linus Torvalds [Mon, 7 Jan 2019 01:08:20 +0000 (17:08 -0800)]
Linux 5.0-rc1

5 years agoMerge tag 'kbuild-v4.21-3' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy...
Linus Torvalds [Mon, 7 Jan 2019 00:33:10 +0000 (16:33 -0800)]
Merge tag 'kbuild-v4.21-3' of git://git./linux/kernel/git/masahiroy/linux-kbuild

Pull more Kbuild updates from Masahiro Yamada:

 - improve boolinit.cocci and use_after_iter.cocci semantic patches

 - fix alignment for kallsyms

 - move 'asm goto' compiler test to Kconfig and clean up jump_label
   CONFIG option

 - generate asm-generic wrappers automatically if arch does not
   implement mandatory UAPI headers

 - remove redundant generic-y defines

 - misc cleanups

* tag 'kbuild-v4.21-3' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kconfig: rename generated .*conf-cfg to *conf-cfg
  kbuild: remove unnecessary stubs for archheader and archscripts
  kbuild: use assignment instead of define ... endef for filechk_* rules
  arch: remove redundant UAPI generic-y defines
  kbuild: generate asm-generic wrappers if mandatory headers are missing
  arch: remove stale comments "UAPI Header export list"
  riscv: remove redundant kernel-space generic-y
  kbuild: change filechk to surround the given command with { }
  kbuild: remove redundant target cleaning on failure
  kbuild: clean up rule_dtc_dt_yaml
  kbuild: remove UIMAGE_IN and UIMAGE_OUT
  jump_label: move 'asm goto' support test to Kconfig
  kallsyms: lower alignment on ARM
  scripts: coccinelle: boolinit: drop warnings on named constants
  scripts: coccinelle: check for redeclaration
  kconfig: remove unused "file" field of yylval union
  nds32: remove redundant kernel-space generic-y
  nios2: remove unneeded HAS_DMA define

5 years agoMerge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Mon, 7 Jan 2019 00:30:14 +0000 (16:30 -0800)]
Merge branch 'perf-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull perf tooling updates form Ingo Molnar:
 "A final batch of perf tooling changes: mostly fixes and small
  improvements"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (29 commits)
  perf session: Add comment for perf_session__register_idle_thread()
  perf thread-stack: Fix thread stack processing for the idle task
  perf thread-stack: Allocate an array of thread stacks
  perf thread-stack: Factor out thread_stack__init()
  perf thread-stack: Allow for a thread stack array
  perf thread-stack: Avoid direct reference to the thread's stack
  perf thread-stack: Tidy thread_stack__bottom() usage
  perf thread-stack: Simplify some code in thread_stack__process()
  tools gpio: Allow overriding CFLAGS
  tools power turbostat: Override CFLAGS assignments and add LDFLAGS to build command
  tools thermal tmon: Allow overriding CFLAGS assignments
  tools power x86_energy_perf_policy: Override CFLAGS assignments and add LDFLAGS to build command
  perf c2c: Increase the HITM ratio limit for displayed cachelines
  perf c2c: Change the default coalesce setup
  perf trace beauty ioctl: Beautify USBDEVFS_ commands
  perf trace beauty: Export function to get the files for a thread
  perf trace: Wire up ioctl's USBDEBFS_ cmd table generator
  perf beauty ioctl: Add generator for USBDEVFS_ ioctl commands
  tools headers uapi: Grab a copy of usbdevice_fs.h
  perf trace: Store the major number for a file when storing its pathname
  ...

5 years agoChange mincore() to count "mapped" pages rather than "cached" pages
Linus Torvalds [Sun, 6 Jan 2019 01:50:59 +0000 (17:50 -0800)]
Change mincore() to count "mapped" pages rather than "cached" pages

The semantics of what "in core" means for the mincore() system call are
somewhat unclear, but Linux has always (since 2.3.52, which is when
mincore() was initially done) treated it as "page is available in page
cache" rather than "page is mapped in the mapping".

The problem with that traditional semantic is that it exposes a lot of
system cache state that it really probably shouldn't, and that users
shouldn't really even care about.

So let's try to avoid that information leak by simply changing the
semantics to be that mincore() counts actual mapped pages, not pages
that might be cheaply mapped if they were faulted (note the "might be"
part of the old semantics: being in the cache doesn't actually guarantee
that you can access them without IO anyway, since things like network
filesystems may have to revalidate the cache before use).

In many ways the old semantics were somewhat insane even aside from the
information leak issue.  From the very beginning (and that beginning is
a long time ago: 2.3.52 was released in March 2000, I think), the code
had a comment saying

  Later we can get more picky about what "in core" means precisely.

and this is that "later".  Admittedly it is much later than is really
comfortable.

NOTE! This is a real semantic change, and it is for example known to
change the output of "fincore", since that program literally does a
mmmap without populating it, and then doing "mincore()" on that mapping
that doesn't actually have any pages in it.

I'm hoping that nobody actually has any workflow that cares, and the
info leak is real.

We may have to do something different if it turns out that people have
valid reasons to want the old semantics, and if we can limit the
information leak sanely.

Cc: Kevin Easton <kevin@guarana.org>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Masatake YAMATO <yamato@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agoFix 'acccess_ok()' on alpha and SH
Linus Torvalds [Sun, 6 Jan 2019 19:15:04 +0000 (11:15 -0800)]
Fix 'acccess_ok()' on alpha and SH

Commit 594cc251fdd0 ("make 'user_access_begin()' do 'access_ok()'")
broke both alpha and SH booting in qemu, as noticed by Guenter Roeck.

It turns out that the bug wasn't actually in that commit itself (which
would have been surprising: it was mostly a no-op), but in how the
addition of access_ok() to the strncpy_from_user() and strnlen_user()
functions now triggered the case where those functions would test the
access of the very last byte of the user address space.

The string functions actually did that user range test before too, but
they did it manually by just comparing against user_addr_max().  But
with user_access_begin() doing the check (using "access_ok()"), it now
exposed problems in the architecture implementations of that function.

For example, on alpha, the access_ok() helper macro looked like this:

  #define __access_ok(addr, size) \
        ((get_fs().seg & (addr | size | (addr+size))) == 0)

and what it basically tests is of any of the high bits get set (the
USER_DS masking value is 0xfffffc0000000000).

And that's completely wrong for the "addr+size" check.  Because it's
off-by-one for the case where we check to the very end of the user
address space, which is exactly what the strn*_user() functions do.

Why? Because "addr+size" will be exactly the size of the address space,
so trying to access the last byte of the user address space will fail
the __access_ok() check, even though it shouldn't.  As a result, the
user string accessor functions failed consistently - because they
literally don't know how long the string is going to be, and the max
access is going to be that last byte of the user address space.

Side note: that alpha macro is buggy for another reason too - it re-uses
the arguments twice.

And SH has another version of almost the exact same bug:

  #define __addr_ok(addr) \
        ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)

so far so good: yes, a user address must be below the limit.  But then:

  #define __access_ok(addr, size)         \
        (__addr_ok((addr) + (size)))

is wrong with the exact same off-by-one case: the case when "addr+size"
is exactly _equal_ to the limit is actually perfectly fine (think "one
byte access at the last address of the user address space")

The SH version is actually seriously buggy in another way: it doesn't
actually check for overflow, even though it did copy the _comment_ that
talks about overflow.

So it turns out that both SH and alpha actually have completely buggy
implementations of access_ok(), but they happened to work in practice
(although the SH overflow one is a serious serious security bug, not
that anybody likely cares about SH security).

This fixes the problems by using a similar macro on both alpha and SH.
It isn't trying to be clever, the end address is based on this logic:

        unsigned long __ao_end = __ao_a + __ao_b - !!__ao_b;

which basically says "add start and length, and then subtract one unless
the length was zero".  We can't subtract one for a zero length, or we'd
just hit an underflow instead.

For a lot of access_ok() users the length is a constant, so this isn't
actually as expensive as it initially looks.

Reported-and-tested-by: Guenter Roeck <linux@roeck-us.net>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agoMerge tag 'fscrypt_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...
Linus Torvalds [Sun, 6 Jan 2019 20:21:11 +0000 (12:21 -0800)]
Merge tag 'fscrypt_for_linus' of git://git./linux/kernel/git/tytso/fscrypt

Pull fscrypt updates from Ted Ts'o:
 "Add Adiantum support for fscrypt"

* tag 'fscrypt_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt:
  fscrypt: add Adiantum support