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2020-06-14treewide: replace '---help---' in Kconfig files with 'help'Masahiro Yamada3-7/+7
Since commit 84af7a6194e4 ("checkpatch: kconfig: prefer 'help' over '---help---'"), the number of '---help---' has been gradually decreasing, but there are still more than 2400 instances. This commit finishes the conversion. While I touched the lines, I also fixed the indentation. There are a variety of indentation styles found. a) 4 spaces + '---help---' b) 7 spaces + '---help---' c) 8 spaces + '---help---' d) 1 space + 1 tab + '---help---' e) 1 tab + '---help---' (correct indentation) f) 1 tab + 1 space + '---help---' g) 1 tab + 2 spaces + '---help---' In order to convert all of them to 1 tab + 'help', I ran the following commend: $ find . -name 'Kconfig*' | xargs sed -i 's/^[[:space:]]*---help---/\thelp/' Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-06-10Merge tag 'dmaengine-5.8-rc1' of git://git.infradead.org/users/vkoul/slave-dmaLinus Torvalds21-184/+272
Pull dmaengine updates from Vinod Koul: "A fairly small dmaengine update which includes mostly driver updates (dmatest, dw-edma, ioat, mmp-tdma and k3-udma) along with Renesas binding update to json-schema" * tag 'dmaengine-5.8-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (39 commits) dmaengine: imx-sdma: initialize all script addresses dmaengine: ti: k3-udma: Use proper return code in alloc_chan_resources dmaengine: ti: k3-udma: Remove udma_chan.in_ring_cnt dmaengine: ti: k3-udma: Add missing dma_sync call for rx flush descriptor dmaengine: at_xdmac: Replace zero-length array with flexible-array dmaengine: at_hdmac: Replace zero-length array with flexible-array dmaengine: qcom: bam_dma: Replace zero-length array with flexible-array dmaengine: ti: k3-udma: Use PTR_ERR_OR_ZERO() to simplify code dmaengine: moxart-dma: Drop pointless static qualifier in moxart_probe() dmaengine: sf-pdma: Simplify the error handling path in 'sf_pdma_probe()' dmaengine: qcom_hidma: use true,false for bool variable dmaengine: dw-edma: support local dma device transfer semantics dmaengine: Fix doc strings to satisfy validation script dmaengine: Include dmaengine.h into dmaengine.c dmaengine: dmatest: Describe members of struct dmatest_info dmaengine: dmatest: Describe members of struct dmatest_params dmaengine: dmatest: Allow negative timeout value to specify infinite wait Revert "dmaengine: dmatest: timeout value of -1 should specify infinite wait" dmaengine: stm32-dma: direct mode support through device tree dt-bindings: dma: add direct mode support through device tree in stm32-dma ...
2020-05-19dmaengine: tegra210-adma: Fix an error handling path in 'tegra_adma_probe()'Christophe JAILLET1-1/+1
Commit b53611fb1ce9 ("dmaengine: tegra210-adma: Fix crash during probe") has moved some code in the probe function and reordered the error handling path accordingly. However, a goto has been missed. Fix it and goto the right label if 'dma_async_device_register()' fails, so that all resources are released. Fixes: b53611fb1ce9 ("dmaengine: tegra210-adma: Fix crash during probe") Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/20200516214205.276266-1-christophe.jaillet@wanadoo.fr Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-15dmaengine: imx-sdma: initialize all script addressesSascha Hauer1-1/+1
The script addresses array increases with each new version. The driver initializes the array to -EINVAL initially, but only up to the size of the v1 array. Initialize the additional addresses for the newer versions as well. Without this uninitialized values of the newer arrays are treated as valid. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Reviewed-by: Robin Gong <yibin.gong@nxp.com> Link: https://lore.kernel.org/r/20200513060405.18685-1-s.hauer@pengutronix.de Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-15dmaengine: ti: k3-udma: Use proper return code in alloc_chan_resourcesPeter Ujfalusi1-0/+1
In udma_alloc_chan_resources() if the channel is not willing to stop then the function should return with error code. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Link: https://lore.kernel.org/r/20200512134519.5642-1-peter.ujfalusi@ti.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-15dmaengine: ti: k3-udma: Remove udma_chan.in_ring_cntPeter Ujfalusi1-15/+1
The in_ring_cnt is not used for anything, it can be removed. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Link: https://lore.kernel.org/r/20200512134611.6015-1-peter.ujfalusi@ti.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-15dmaengine: ti: k3-udma: Add missing dma_sync call for rx flush descriptorPeter Ujfalusi1-0/+3
The TR mode rx flush descriptor did not had a dma_sync_single_for_device() call to make sure that the DMA see the correct information. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Link: https://lore.kernel.org/r/20200512134544.5839-1-peter.ujfalusi@ti.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-15dmaengine: ti: k3-udma: Fix TR mode flags for slave_sg and memcpyPeter Ujfalusi1-2/+4
cppi5_tr_csf_set() clears previously set Configuration Specific Flags. Setting the EOP flag clears the SUPR_EVT flag for the last TR which is not desirable as we do not want to have events from the TR. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Link: https://lore.kernel.org/r/20200512134531.5742-1-peter.ujfalusi@ti.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-15dmaengine: zynqmp_dma: Move list_del inside zynqmp_dma_free_descriptor.Rafał Hibner1-2/+1
List elements are not formally removed from list during zynqmp_dma_reset. Signed-off-by: Rafal Hibner <rafal.hibner@secom.com.pl> Link: https://lore.kernel.org/r/20200506102844.2259-1-rafal.hibner@secom.com.pl Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-13dmaengine: at_xdmac: Replace zero-length array with flexible-arrayGustavo A. R. Silva1-1/+1
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] sizeof(flexible-array-member) triggers a warning because flexible array members have incomplete type[1]. There are some instances of code in which the sizeof operator is being incorrectly/erroneously applied to zero-length arrays and the result is zero. Such instances may be hiding some bugs. So, this work (flexible-array member conversions) will also help to get completely rid of those sorts of issues. This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Acked-by: Ludovic Desroches<ludovic.desroches@microchip.com> Link: https://lore.kernel.org/r/20200507190046.GA15298@embeddedor Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-13dmaengine: at_hdmac: Replace zero-length array with flexible-arrayGustavo A. R. Silva1-1/+1
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] sizeof(flexible-array-member) triggers a warning because flexible array members have incomplete type[1]. There are some instances of code in which the sizeof operator is being incorrectly/erroneously applied to zero-length arrays and the result is zero. Such instances may be hiding some bugs. So, this work (flexible-array member conversions) will also help to get completely rid of those sorts of issues. This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Acked-by: Ludovic Desroches<ludovic.desroches@microchip.com> Link: https://lore.kernel.org/r/20200507190038.GA15272@embeddedor Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-13dmaengine: qcom: bam_dma: Replace zero-length array with flexible-arrayGustavo A. R. Silva1-1/+1
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] sizeof(flexible-array-member) triggers a warning because flexible array members have incomplete type[1]. There are some instances of code in which the sizeof operator is being incorrectly/erroneously applied to zero-length arrays and the result is zero. Such instances may be hiding some bugs. So, this work (flexible-array member conversions) will also help to get completely rid of those sorts of issues. This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Link: https://lore.kernel.org/r/20200508210707.GA24136@embeddedor Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-13dmaengine: ti: k3-udma: Use PTR_ERR_OR_ZERO() to simplify codeSamuel Zou1-9/+3
Fixes coccicheck warnings: drivers/dma/ti/k3-udma.c:1294:1-3: WARNING: PTR_ERR_OR_ZERO can be used drivers/dma/ti/k3-udma.c:1311:1-3: WARNING: PTR_ERR_OR_ZERO can be used drivers/dma/ti/k3-udma.c:1376:1-3: WARNING: PTR_ERR_OR_ZERO can be used Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Samuel Zou <zou_wei@huawei.com> Link: https://lore.kernel.org/r/1588757146-38858-1-git-send-email-zou_wei@huawei.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-13dmaengine: moxart-dma: Drop pointless static qualifier in moxart_probe()YueHaibing1-1/+1
There is no need to have the 'void __iomem *dma_base_addr' variable static since new value always be assigned before use it. Signed-off-by: YueHaibing <yuehaibing@huawei.com> Link: https://lore.kernel.org/r/20200505101353.195446-1-yuehaibing@huawei.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-13dmaengine: sf-pdma: Simplify the error handling path in 'sf_pdma_probe()'Christophe JAILLET1-18/+7
There is no need to explicitly free memory that have been 'devm_kzalloc'ed. Simplify the probe function accordingly. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Tested-by: Green Wan <green.wan@sifive.com> Reviewed-by: Green Wan <green.wan@sifive.com> Link: https://lore.kernel.org/r/20200501100824.126534-1-christophe.jaillet@wanadoo.fr Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-13dmaengine: qcom_hidma: use true,false for bool variableJason Yan1-1/+1
Fix the following coccicheck warning: drivers/dma/qcom/hidma.c:553:1-17: WARNING: Assignment of 0/1 to bool variable Signed-off-by: Jason Yan <yanaijie@huawei.com> Acked By: Sinan Kaya <okaya@kernel.org> Link: https://lore.kernel.org/r/20200504113406.41530-1-yanaijie@huawei.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-13dmaengine: dmatest: Restore default for channelVladimir Murzin1-4/+5
In case of dmatest is built-in and no channel was configured test doesn't run with: dmatest: Could not start test, no channels configured Even though description to "channel" parameter claims that default is any. Add default channel back as it used to be rather than reject test with no channel configuration. Fixes: d53513d5dc285d9a95a534fc41c5c08af6b60eac ("dmaengine: dmatest: Add support for multi channel testing) Reported-by: Dijil Mohan <Dijil.Mohan@arm.com> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com> Link: https://lore.kernel.org/r/20200429071522.58148-1-vladimir.murzin@arm.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-04dmaengine: idxd: fix interrupt completion after unmaskingDave Jiang2-7/+26
The current implementation may miss completions after we unmask the interrupt. In order to make sure we process all competions, we need to: 1. Do an MMIO read from the device as a barrier to ensure that all PCI writes for completions have arrived. 2. Check for any additional completions that we missed. Fixes: 8f47d1a5e545 ("dmaengine: idxd: connect idxd to dmaengine subsystem") Reported-by: Sanjay Kumar <sanjay.k.kumar@intel.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/158834641769.35613.1341160109892008587.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-04dmaengine: owl: Use correct lock in owl_dma_get_pchan()Cristian Ciocaltea1-5/+3
When the kernel is built with lockdep support and the owl-dma driver is used, the following message is shown: [ 2.496939] INFO: trying to register non-static key. [ 2.501889] the code is fine but needs lockdep annotation. [ 2.507357] turning off the locking correctness validator. [ 2.512834] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.6.3+ #15 [ 2.519084] Hardware name: Generic DT based system [ 2.523878] Workqueue: events_freezable mmc_rescan [ 2.528681] [<801127f0>] (unwind_backtrace) from [<8010da58>] (show_stack+0x10/0x14) [ 2.536420] [<8010da58>] (show_stack) from [<8080fbe8>] (dump_stack+0xb4/0xe0) [ 2.543645] [<8080fbe8>] (dump_stack) from [<8017efa4>] (register_lock_class+0x6f0/0x718) [ 2.551816] [<8017efa4>] (register_lock_class) from [<8017b7d0>] (__lock_acquire+0x78/0x25f0) [ 2.560330] [<8017b7d0>] (__lock_acquire) from [<8017e5e4>] (lock_acquire+0xd8/0x1f4) [ 2.568159] [<8017e5e4>] (lock_acquire) from [<80831fb0>] (_raw_spin_lock_irqsave+0x3c/0x50) [ 2.576589] [<80831fb0>] (_raw_spin_lock_irqsave) from [<8051b5fc>] (owl_dma_issue_pending+0xbc/0x120) [ 2.585884] [<8051b5fc>] (owl_dma_issue_pending) from [<80668cbc>] (owl_mmc_request+0x1b0/0x390) [ 2.594655] [<80668cbc>] (owl_mmc_request) from [<80650ce0>] (mmc_start_request+0x94/0xbc) [ 2.602906] [<80650ce0>] (mmc_start_request) from [<80650ec0>] (mmc_wait_for_req+0x64/0xd0) [ 2.611245] [<80650ec0>] (mmc_wait_for_req) from [<8065aa10>] (mmc_app_send_scr+0x10c/0x144) [ 2.619669] [<8065aa10>] (mmc_app_send_scr) from [<80659b3c>] (mmc_sd_setup_card+0x4c/0x318) [ 2.628092] [<80659b3c>] (mmc_sd_setup_card) from [<80659f0c>] (mmc_sd_init_card+0x104/0x430) [ 2.636601] [<80659f0c>] (mmc_sd_init_card) from [<8065a3e0>] (mmc_attach_sd+0xcc/0x16c) [ 2.644678] [<8065a3e0>] (mmc_attach_sd) from [<8065301c>] (mmc_rescan+0x3ac/0x40c) [ 2.652332] [<8065301c>] (mmc_rescan) from [<80143244>] (process_one_work+0x2d8/0x780) [ 2.660239] [<80143244>] (process_one_work) from [<80143730>] (worker_thread+0x44/0x598) [ 2.668323] [<80143730>] (worker_thread) from [<8014b5f8>] (kthread+0x148/0x150) [ 2.675708] [<8014b5f8>] (kthread) from [<801010b4>] (ret_from_fork+0x14/0x20) [ 2.682912] Exception stack(0xee8fdfb0 to 0xee8fdff8) [ 2.687954] dfa0: 00000000 00000000 00000000 00000000 [ 2.696118] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 2.704277] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 The obvious fix would be to use 'spin_lock_init()' on 'pchan->lock' before attempting to call 'spin_lock_irqsave()' in 'owl_dma_get_pchan()'. However, according to Manivannan Sadhasivam, 'pchan->lock' was supposed to only protect 'pchan->vchan' while 'od->lock' does a similar job in 'owl_dma_terminate_pchan()'. Therefore, this patch substitutes 'pchan->lock' with 'od->lock' and removes the 'lock' attribute in 'owl_dma_pchan' struct. Fixes: 47e20577c24d ("dmaengine: Add Actions Semi Owl family S900 DMA driver") Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Acked-by: Andreas Färber <afaerber@suse.de> Link: https://lore.kernel.org/r/c6e6cdaca252b5364bd294093673951036488cf0.1588439073.git.cristian.ciocaltea@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-04dmaengine: dw-edma: support local dma device transfer semanticsAlan Mikhak1-7/+20
Modify dw_edma_device_transfer() to also support the semantics of dma device transfer for additional use cases involving pcitest utility as a local initiator. For its original use case, dw-edma supported the semantics of dma device transfer from the perspective of a remote initiator who is located across the PCIe bus from dma channel hardware. To a remote initiator, DMA_DEV_TO_MEM means using a remote dma WRITE channel to transfer from remote memory to local memory. A WRITE channel would be employed on the remote device in order to move the contents of remote memory to the bus destined for local memory. To a remote initiator, DMA_MEM_TO_DEV means using a remote dma READ channel to transfer from local memory to remote memory. A READ channel would be employed on the remote device in order to move the contents of local memory to the bus destined for remote memory. >From the perspective of a local dma initiator who is co-located on the same side of the PCIe bus as the dma channel hardware, the semantics of dma device transfer are flipped. To a local initiator, DMA_DEV_TO_MEM means using a local dma READ channel to transfer from remote memory to local memory. A READ channel would be employed on the local device in order to move the contents of remote memory to the bus destined for local memory. To a local initiator, DMA_MEM_TO_DEV means using a local dma WRITE channel to transfer from local memory to remote memory. A WRITE channel would be employed on the local device in order to move the contents of local memory to the bus destined for remote memory. To support local dma initiators, dw_edma_device_transfer() is modified to now examine the direction field of struct dma_slave_config for the channel which initiators can configure by calling dmaengine_slave_config(). If direction is configured as either DMA_DEV_TO_MEM or DMA_MEM_TO_DEV, local initiator semantics are used. If direction is a value other than DMA_DEV_TO_MEM nor DMA_MEM_TO_DEV, then remote initiator semantics are used. This should maintain backward compatibility with the original use case of dw-edma. The dw-edma-test utility is an example of a remote initiator. From reading its patch, dw-edma-test does not specifically set the direction field of struct dma_slave_config. Since dw_edma_device_transfer() also does not check the direction field of struct dma_slave_config, it seems safe to use this convention in dw-edma to support both local and remote initiator semantics. Signed-off-by: Alan Mikhak <alan.mikhak@sifive.com> Link: https://lore.kernel.org/r/1588122633-1552-1-git-send-email-alan.mikhak@sifive.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-04dmaengine: Fix doc strings to satisfy validation scriptAndy Shevchenko1-46/+50
The validation kernel doc script complains about undescribed function parameters .../dmaengine.c:155: warning: Function parameter or member 'dev' not descr ibed in 'dev_to_dma_chan' .../dmaengine.c:251: warning: cannot understand function prototype: 'dma_cap_mask_t dma_cap_mask_all; ' .../dmaengine.c:257: warning: cannot understand function prototype: 'struct dma_chan_tbl_ent ' .../dmaengine.c:264: warning: cannot understand function prototype: 'struct dma_chan_tbl_ent __percpu *channel_table[DMA_TX_TYPE_END]; ' .../dmaengine.c:304: warning: Function parameter or member 'chan' not described in 'dma_chan_is_local' .../dmaengine.c:304: warning: Function parameter or member 'cpu' not described in 'dma_chan_is_local' .../dmaengine.c:414: warning: Function parameter or member 'chan' not described in 'balance_ref_count' .../dmaengine.c:447: warning: Function parameter or member 'chan' not described in 'dma_chan_get' .../dmaengine.c:494: warning: Function parameter or member 'chan' not described in 'dma_chan_put' Add descriptions to the function parameters and in some cases update existing text as well. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200429122151.50989-2-andriy.shevchenko@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-05-04dmaengine: Include dmaengine.h into dmaengine.cAndy Shevchenko1-0/+2
Compiler is not happy about non-static functions due to missed inclusion .../dmaengine.c:682:18: warning: no previous prototype for ‘dma_get_slave_channel’ [-Wmissing-prototypes] 682 | struct dma_chan *dma_get_slave_channel(struct dma_chan *chan) | ^~~~~~~~~~~~~~~~~~~~~ .../dmaengine.c:713:18: warning: no previous prototype for ‘dma_get_any_slave_channel’ [-Wmissing-prototypes] 713 | struct dma_chan *dma_get_any_slave_channel(struct dma_device *device) | ^~~~~~~~~~~~~~~~~~~~~~~~~ Include missed header to satisfy compiler. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200429122151.50989-1-andriy.shevchenko@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-28dmaengine: dmatest: Fix process hang when reading 'wait' parameterAndy Shevchenko1-1/+1
If we do % echo 1 > /sys/module/dmatest/parameters/run [ 115.851124] dmatest: Could not start test, no channels configured % echo dma8chan7 > /sys/module/dmatest/parameters/channel [ 127.563872] dmatest: Added 1 threads using dma8chan7 % cat /sys/module/dmatest/parameters/wait ... !!! HANG !!! ... The culprit is the commit 6138f967bccc ("dmaengine: dmatest: Use fixed point div to calculate iops") which makes threads not to run, but pending and being kicked off by writing to the 'run' node. However, it forgot to consider 'wait' routine to avoid above mentioned case. In order to fix this, check for really running threads, i.e. with pending and done flags unset. It's pity the culprit commit hadn't updated documentation and tested all possible scenarios. Fixes: 6138f967bccc ("dmaengine: dmatest: Use fixed point div to calculate iops") Cc: Seraj Alijan <seraj.alijan@sondrel.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200428113518.70620-1-andriy.shevchenko@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-27dmaengine: dmatest: Describe members of struct dmatest_infoAndy Shevchenko1-0/+3
Kernel documentation validator complains that not all members of struct dmatest_info are being described. Describe them all. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200424161147.16895-6-andriy.shevchenko@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-27dmaengine: dmatest: Describe members of struct dmatest_paramsAndy Shevchenko1-4/+9
Kernel documentation validator complains that not all members of struct dmatest_params are being described. Describe them all. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200424161147.16895-5-andriy.shevchenko@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-27dmaengine: dmatest: Allow negative timeout value to specify infinite waitAndy Shevchenko1-1/+1
The dmatest module parameter 'timeout' is documented as accepting a -1 to mean "infinite timeout". However, an infinite timeout is not advised, nor possible since the module parameter is an unsigned int, which won't accept a negative value. Change the parameter type to be signed integer. Cc: Gary Hook <Gary.Hook@amd.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200424161147.16895-4-andriy.shevchenko@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-27Revert "dmaengine: dmatest: timeout value of -1 should specify infinite wait"Andy Shevchenko1-3/+3
This reverts commit ed04b7c57c3383ed4573f1d1d1dbdc1108ba0bed. While it gives a good description what happens, the approach seems too confusing. Let's fix it in the following patch. Cc: Gary Hook <Gary.Hook@amd.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200424161147.16895-3-andriy.shevchenko@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-27dmaengine: dmatest: Fix iteration non-stop logicAndy Shevchenko1-2/+2
Under some circumstances, i.e. when test is still running and about to time out and user runs, for example, grep -H . /sys/module/dmatest/parameters/* the iterations parameter is not respected and test is going on and on until user gives echo 0 > /sys/module/dmatest/parameters/run This is not what expected. The history of this bug is interesting. I though that the commit 2d88ce76eb98 ("dmatest: add a 'wait' parameter") is a culprit, but looking closer to the code I think it simple revealed the broken logic from the day one, i.e. in the commit 0a2ff57d6fba ("dmaengine: dmatest: add a maximum number of test iterations") which adds iterations parameter. So, to the point, the conditional of checking the thread to be stopped being first part of conjunction logic prevents to check iterations. Thus, we have to always check both conditions to be able to stop after given iterations. Since it wasn't visible before second commit appeared, I add a respective Fixes tag. Fixes: 2d88ce76eb98 ("dmatest: add a 'wait' parameter") Cc: Dan Williams <dan.j.williams@intel.com> Cc: Nicolas Ferre <nicolas.ferre@microchip.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20200424161147.16895-1-andriy.shevchenko@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-27dmaengine: stm32-dma: direct mode support through device treeAmelie Delaunay1-10/+31
Direct mode or FIFO mode is computed by stm32-dma driver. Add a way for the user to force direct mode, by setting bit 2 in the bitfield value specifying DMA features in the device tree. Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com> Link: https://lore.kernel.org/r/20200422102904.1448-3-amelie.delaunay@st.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-27dmaengine: qcom_hidma: Simplify error handling path in hidma_probeChristophe JAILLET1-1/+0
There is no need to call 'hidma_debug_uninit()' in the error handling path. 'hidma_debug_init()' has not been called yet. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Link: https://lore.kernel.org/r/20200427111043.70218-1-christophe.jaillet@wanadoo.fr Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-27dmaengine: tegra-apb: Ensure that clock is enabled during of DMA synchronizationDmitry Osipenko1-0/+9
DMA synchronization hook checks whether interrupt is raised by testing corresponding bit in a hardware status register, and thus, clock should be enabled in this case, otherwise CPU may hang if synchronization is invoked while Runtime PM is in suspended state. This patch resumes the RPM during of the DMA synchronization process in order to avoid potential problems. It is a minor clean up of a previous commit, no real problem is fixed by this patch because currently RPM is always in a resumed state while DMA is synchronized, although this may change in the future. Fixes: 6697255f239f ("dmaengine: tegra-apb: Improve DMA synchronization") Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Link: https://lore.kernel.org/r/20200426190835.21950-1-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-27dmaengine: mmp_tdma: Validate the transfer directionLubomir Rintel1-0/+5
We only support DMA_DEV_TO_MEM and DMA_MEM_TO_DEV. Let's not do undefined things with other values and reject them. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Link: https://lore.kernel.org/r/20200424215020.105281-1-lkundrak@v3.sk Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-27dmaengine: dw-edma: Check MSI descriptor before copyingAlan Mikhak1-7/+10
Modify dw_edma_irq_request() to check if a struct msi_desc entry exists before copying the contents of its struct msi_msg pointer. Without this sanity check, __get_cached_msi_msg() crashes when invoked by dw_edma_irq_request() running on a Linux-based PCIe endpoint device. MSI interrupt are not received by PCIe endpoint devices. If irq_get_msi_desc() returns null, then there is no cached struct msi_msg to be copied. Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Alan Mikhak <alan.mikhak@sifive.com> Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com> Link: https://lore.kernel.org/r/1587607101-31914-1-git-send-email-alan.mikhak@sifive.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-27dmaengine: fix channel index enumerationDave Jiang1-34/+26
When the channel register code was changed to allow hotplug operations, dynamic indexing wasn't taken into account. When channels are randomly plugged and unplugged out of order, the serial indexing breaks. Convert channel indexing to using IDA tracking in order to allow dynamic assignment. The previous code does not cause any regression bug for existing channel allocation besides idxd driver since the hotplug usage case is only used by idxd at this point. With this change, the chan->idr_ref is also not needed any longer. We can have a device with no channels registered due to hot plug. The channel device release code no longer should attempt to free the dma device id on the last channel release. Fixes: e81274cd6b52 ("dmaengine: add support to dynamic register/unregister of channels") Reported-by: Yixin Zhang <yixin.zhang@intel.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Tested-by: Yixin Zhang <yixin.zhang@intel.com> Link: https://lore.kernel.org/r/158679961260.7674.8485924270472851852.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-23dmaengine: ioat: adding missed issue_pending to timeout handlerLeonid Ravich1-0/+9
completion timeout might trigger unnesesery DMA engine hw reboot in case of missed issue_pending() . Acked-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Leonid Ravich <Leonid.Ravich@emc.com> Link: https://lore.kernel.org/r/1587589761-32690-3-git-send-email-leonid.ravich@dell.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-23dmaengine: ioat: remove unnesesery double complition timer modification.Leonid Ravich1-9/+16
removing unnecessary mod_timer from timeout handler incase of ioat_cleanup_preamble() is true for cleaner code Acked-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Leonid Ravich <Leonid.Ravich@emc.com> Link: https://lore.kernel.org/r/1587589761-32690-2-git-send-email-leonid.ravich@dell.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-23dmaengine: ioat: removing duplicate code from timeout handlerLeonid Ravich1-26/+19
moving duplicate code from timeout error handling to common function. Acked-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Leonid Ravich <Leonid.Ravich@emc.com> Link: https://lore.kernel.org/r/1587589761-32690-1-git-send-email-leonid.ravich@dell.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-23dmaengine: mmp_tdma: Remove the MMP_SRAM dependencyLubomir Rintel1-2/+0
A generic SRAM will driver for Device Tree enabled platforms will do as well. The non-DT drivers that use mmp_tdma to transfer audio samples to and from the audio SRAM should depend on MMP_SRAM themselves. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Link: https://lore.kernel.org/r/20200419164912.670973-8-lkundrak@v3.sk Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-23dmaengine: mmp_tdma: Fill in slave capabilitiesLubomir Rintel1-0/+11
This makes dma_get_slave_caps() work with the device so that it could actually be used with soc-generic-dmaengine-pcm. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Link: https://lore.kernel.org/r/20200419164912.670973-7-lkundrak@v3.sk Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-23dmaengine: mmp_tdma: Log an error if channel is in wrong stateLubomir Rintel1-1/+3
Let's log an error if the channel can't be prepared because it is in an unexpected state. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Link: https://lore.kernel.org/r/20200419164912.670973-6-lkundrak@v3.sk Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-23dmaengine: mmp_tdma: Reset channel error on releaseLubomir Rintel1-0/+2
When a channel configuration fails, the status of the channel is set to DEV_ERROR so that an attempt to submit it fails. However, this status sticks until the heat end of the universe, making it impossible to recover from the error. Let's reset it when the channel is released so that further use of the channel with correct configuration is not impacted. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Link: https://lore.kernel.org/r/20200419164912.670973-5-lkundrak@v3.sk Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-23dmaengine: mmp_tdma: Drop "mmp_tdma: from error messagesLubomir Rintel1-3/+3
Drop a redundant "mmp_tdma:" from some error messages. The dev_err() appends mostly the same thing for us: [ 120.756530] mmp-tdma d42a0800.adma: mmp_tdma: unknown burst size. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Link: https://lore.kernel.org/r/20200419164912.670973-3-lkundrak@v3.sk Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-23dmaengine: mmp_tdma: Do not ignore slave config validation errorsLubomir Rintel1-1/+2
With an invalid dma_slave_config set previously, mmp_tdma_prep_dma_cyclic() would detect an error whilst configuring the channel, but proceed happily on: [ 120.756530] mmp-tdma d42a0800.adma: mmp_tdma: unknown burst size. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Link: https://lore.kernel.org/r/20200419164912.670973-2-lkundrak@v3.sk Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-23dmaengine: pch_dma.c: Avoid data race between probe and irq handlerMadhuparna Bhowmik1-1/+1
pd->dma.dev is read in irq handler pd_irq(). However, it is set to pdev->dev after request_irq(). Therefore, set pd->dma.dev to pdev->dev before request_irq() to avoid data race between pch_dma_probe() and pd_irq(). Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com> Link: https://lore.kernel.org/r/20200416062335.29223-1-madhuparnabhowmik10@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-17dmaengine: ioat: Decreasing allocation chunk size 2M->512KLeonid Ravich1-1/+1
requreing kmalloc of 2M high chance to fail in fragmented memory. IOAT ring requires 64k * 64B memory which will be achived by 512k * 8 allocation instead of 2M * 2. Acked-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Leonid Ravich <Leonid.Ravich@emc.com> Link: https://lore.kernel.org/r/20200416170628.16196-2-leonid.ravich@dell.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-17dmaengine: ioat: fixing chunk sizing macros dependencyLeonid Ravich3-11/+15
changing macros which assumption is chunk size of 2M, which can be other size prepare for changing allocation chunk size. Acked-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Leonid Ravich <Leonid.Ravich@emc.com> Link: https://lore.kernel.org/r/20200416170628.16196-1-leonid.ravich@dell.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-17dmaengine: Fix misspelling of "Analog Devices"Geert Uytterhoeven1-1/+1
According to https://www.analog.com/, the company name is spelled "Analog Devices". Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Link: https://lore.kernel.org/r/20200416103058.15269-3-geert+renesas@glider.be [vkoul: make subsystem name dmaengine] Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-17dmaengine: dw-edma: Decouple dw-edma-core.c from struct pci_devAlan Mikhak3-9/+34
Decouple dw-edma-core.c from struct pci_dev as a step toward integration of dw-edma with pci-epf-test so the latter can initiate dma operations locally from the endpoint side. A barrier to such integration is the dependency of dw_edma_probe() and other functions in dw-edma-core.c on struct pci_dev. The Synopsys DesignWare dw-edma driver was designed to run on host side of PCIe link to initiate DMA operations remotely using eDMA channels of PCIe controller on the endpoint side. This can be inferred from seeing that dw-edma uses struct pci_dev and accesses hardware registers of dma channels across the bus using BAR0 and BAR2. The ops field of struct dw_edma in dw-edma-core.h is currenty undefined: const struct dw_edma_core_ops *ops; However, the kernel builds without failure even when dw-edma driver is enabled. Instead of removing the currently undefined and usued ops field, define struct dw_edma_core_ops and use the ops field to decouple dw-edma-core.c from struct pci_dev. Signed-off-by: Alan Mikhak <alan.mikhak@sifive.com> Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com> Link: https://lore.kernel.org/r/1586971629-30196-1-git-send-email-alan.mikhak@sifive.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-15dmaengine: idxd: export hw version through sysfsDave Jiang1-0/+11
Some user apps would like to know the hardware version in order to determine the variation of the hardware. Export the hardware version number to userspace via sysfs. Signed-off-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/158696714008.39484.13401950732606906479.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-15dmaengine: xilinx_dma: Add missing check for empty listSebastian von Ohr1-10/+10
The DMA transfer might finish just after checking the state with dma_cookie_status, but before the lock is acquired. Not checking for an empty list in xilinx_dma_tx_status may result in reading random data or data corruption when desc is written to. This can be reliably triggered by using dma_sync_wait to wait for DMA completion. Signed-off-by: Sebastian von Ohr <vonohr@smaract.com> Tested-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com> Link: https://lore.kernel.org/r/20200303130518.333-1-vonohr@smaract.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
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