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2020-04-15dmaengine: idxd: export hw version through sysfsDave Jiang
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 Ohr
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>
2020-04-15dmaengine: ti: k3-udma: Disable memcopy via MCU NAVSS on am654Peter Ujfalusi
Trace of a test for DMA memcpy domains slipped into the glue layer commit. The memcpy support should be disabled on the MCU UDMAP. Fixes: d702419134133 ("dmaengine: ti: k3-udma: Add glue layer for non DMAengine users") Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Link: https://lore.kernel.org/r/20200327144228.11101-1-peter.ujfalusi@ti.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-15dmaengine: ti: k3-psil: fix deadlock on error pathGrygorii Strashko
The mutex_unlock() is missed on error path of psil_get_ep_config() which causes deadlock, so add missed mutex_unlock(). Fixes: 8c6bb62f6b4a ("dmaengine: ti: k3 PSI-L remote endpoint configuration") Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Link: https://lore.kernel.org/r/20200408185501.30776-1-grygorii.strashko@ti.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-15dmaengine: ti: k3-udma: Drop COMPILE_TEST for the drivers for nowPeter Ujfalusi
It is not possible to compile test the UDMA stack right now due to dependencies to T_SCI_PROTOCOL and TI_SCI_INTA_IRQCHIP and their dependencies. Remove the COMPILE_TEST until it is actually possible to compile test the drivers. Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/20200403141950.9359-1-peter.ujfalusi@ti.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-15dmaengine: hisilicon: Fix build error without PCI_MSIYueHaibing
If PCI_MSI is not set, building fais: drivers/dma/hisi_dma.c: In function ‘hisi_dma_free_irq_vectors’: drivers/dma/hisi_dma.c:138:2: error: implicit declaration of function ‘pci_free_irq_vectors’; did you mean ‘pci_alloc_irq_vectors’? [-Werror=implicit-function-declaration] pci_free_irq_vectors(data); ^~~~~~~~~~~~~~~~~~~~ Make HISI_DMA depends on PCI_MSI to fix this. Fixes: e9f08b65250d ("dmaengine: hisilicon: Add Kunpeng DMA engine support") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Link: https://lore.kernel.org/r/20200328114133.17560-1-yuehaibing@huawei.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-10drivers/dma/tegra20-apb-dma.c: fix platform_get_irq.cocci warningskbuild test robot
Remove dev_err() messages after platform_get_irq*() failures. platform_get_irq() already prints an error. Generated by: scripts/coccinelle/api/platform_get_irq.cocci Fixes: 6c41ac96ad92 ("dmaengine: tegra-apb: Support COMPILE_TEST") Signed-off-by: kbuild test robot <lkp@intel.com> Signed-off-by: Julia Lawall <julia.lawall@inria.fr> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Thierry Reding <treding@nvidia.com> Cc: Laxman Dewangan <ldewangan@nvidia.com> Cc: Vinod Koul <vinod.koul@linux.intel.com> Cc: Stephen Warren <swarren@wwwdotorg.org> Cc: Jon Hunter <jonathanh@nvidia.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.21.2002271133450.2973@hadrien Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-04-02Merge tag 'dmaengine-5.7-rc1' of git://git.infradead.org/users/vkoul/slave-dmaLinus Torvalds
Pull dmaengine updates from Vinod Koul: "Core: - Some code cleanup and optimization in core by Andy - Debugfs support for displaying dmaengine channels by Peter Drivers: - New driver for uniphier-xdmac controller - Updates to stm32 dma, mdma and dmamux drivers and PM support - More updates to idxd drivers - Bunch of changes in tegra-apb driver and cleaning up of pm functions - Bunch of spelling fixes and Replace zero-length array patches - Shutdown hook for fsl-dpaa2-qdma driver - Support for interleaved transfers for ti-edma and virtualization support for k3-dma driver - Support for reset and updates in xilinx_dma driver - Improvements and locking updates in at_hdma driver" * tag 'dmaengine-5.7-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (89 commits) dt-bindings: dma: renesas,usb-dmac: add r8a77961 support dmaengine: uniphier-xdmac: Remove redandant error log for platform_get_irq dmaengine: tegra-apb: Improve DMA synchronization dmaengine: tegra-apb: Don't save/restore IRQ flags in interrupt handler dmaengine: tegra-apb: mark PM functions as __maybe_unused dmaengine: fix spelling mistake "exceds" -> "exceeds" dmaengine: sprd: Set request pending flag when DMA controller is active dmaengine: ppc4xx: Use scnprintf() for avoiding potential buffer overflow dmaengine: idxd: remove global token limit check dmaengine: idxd: reflect shadow copy of traffic class programming dmaengine: idxd: Merge definition of dsa_batch_desc into dsa_hw_desc dmaengine: Create debug directories for DMA devices dmaengine: ti: k3-udma: Implement custom dbg_summary_show for debugfs dmaengine: Add basic debugfs support dmaengine: fsl-dpaa2-qdma: remove set but not used variable 'dpaa2_qdma' dmaengine: ti: edma: fix null dereference because of a typo in pointer name dmaengine: fsl-dpaa2-qdma: Adding shutdown hook dmaengine: uniphier-xdmac: Add UniPhier external DMA controller driver dt-bindings: dmaengine: Add UniPhier external DMA controller bindings dmaengine: ti: k3-udma: Implement support for atype (for virtualization) ...
2020-03-26dmaengine: uniphier-xdmac: Remove redandant error log for platform_get_irqVinod Koul
platform_get_irq prints the error on failure, so there is no need to have caller add a log. Remove the log in uniphier_xdmac_probe() for platform_get_irq() failure Reported-by: kbuild test robot <lkp@intel.com> Link: https://lore.kernel.org/r/20200323171928.424223-1-vkoul@kernel.org Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-23dmaengine: tegra-apb: Improve DMA synchronizationDmitry Osipenko
Boot CPU0 always handles DMA interrupts and under some rare circumstances it could stuck in uninterruptible state for a significant time (like in a case of KASAN + NFS root). In this case sibling CPU, which waits for DMA transfer completion, will get a DMA transfer timeout. In order to handle this rare condition, interrupt status needs to be polled until interrupt is handled. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Link: https://lore.kernel.org/r/20200319212321.3297-2-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-23dmaengine: tegra-apb: Don't save/restore IRQ flags in interrupt handlerDmitry Osipenko
The interrupt is already disabled while interrupt handler is running, and thus, there is no need to save/restore the IRQ flags within the spinlock. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Link: https://lore.kernel.org/r/20200319212321.3297-1-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-23dmaengine: tegra-apb: mark PM functions as __maybe_unusedYueHaibing
When CONFIG_PM is disabled, gcc warning this: drivers/dma/tegra20-apb-dma.c:1587:12: warning: 'tegra_dma_runtime_resume' defined but not used [-Wunused-function] drivers/dma/tegra20-apb-dma.c:1578:12: warning: 'tegra_dma_runtime_suspend' defined but not used [-Wunused-function] Make it as __maybe_unused to fix the warnings, also remove unneeded function declarations. Fixes: ec8a1586780c ("dma: tegra: add dmaengine based dma driver") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Reviewed-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/20200320071337.59756-1-yuehaibing@huawei.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-23dmaengine: ti: k3-udma-glue: Fix an error handling path in ↵Christophe JAILLET
'k3_udma_glue_cfg_rx_flow()' All but one error handling paths in the 'k3_udma_glue_cfg_rx_flow()' function 'goto err' and call 'k3_udma_glue_release_rx_flow()'. This not correct because this function has a 'channel->flows_ready--;' at the end, but 'flows_ready' has not been incremented here, when we branch to the error handling path. In order to keep a correct value in 'flows_ready', un-roll 'k3_udma_glue_release_rx_flow()', simplify it, add some labels and branch at the correct places when an error is detected. Doing so, we also NULLify 'flow->udma_rflow' in a path that was lacking it. Fixes: d70241913413 ("dmaengine: ti: k3-udma: Add glue layer for non DMAengine user") Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Link: https://lore.kernel.org/r/20200318191209.1267-1-christophe.jaillet@wanadoo.fr Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-23dmaengine: fix spelling mistake "exceds" -> "exceeds"Colin Ian King
There are a couple of spelling mistakes in dev_err error messages. Fix them. Signed-off-by: Colin Ian King <colin.king@canonical.com> Link: https://lore.kernel.org/r/20200316091653.110984-1-colin.king@canonical.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-23dmaengine: sprd: Set request pending flag when DMA controller is activeZhenfang Wang
On new Spreadtrum platforms, when the CPU enters idle, it will close the DMA controllers' clock to save power if the DMA controller is not busy. Moreover the DMA controller's busy signal depends on the DMA enable flag and the request pending flag. When DMA controller starts to transfer data, which means we already set the DMA enable flag, but now we should also set the request pending flag, in case the DMA clock will be closed accidentally if the CPU can not detect the DMA controller's busy signal. Signed-off-by: Zhenfang Wang <zhenfang.wang@unisoc.com> Signed-off-by: Baolin Wang <baolin.wang7@gmail.com> Link: https://lore.kernel.org/r/02adbe4364ec436ec2c5bc8fd2386bab98edd884.1584019223.git.baolin.wang7@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-23dmaengine: idxd: fix off by one on cdev dwq refcountDave Jiang
The refcount check for dedicated workqueue (dwq) is off by one and allows more than 1 user to open the char device. Fix check so only a single user can open the device. Fixes: 42d279f9137a ("dmaengine: idxd: add char driver to expose submission portal to userland") Signed-off-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/158403020187.10208.14117394394540710774.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-11dmaengine: ppc4xx: Use scnprintf() for avoiding potential buffer overflowTakashi Iwai
Since snprintf() returns the would-be-output size instead of the actual output size, the succeeding calls may go beyond the given buffer limit. Fix it by replacing with scnprintf(). Signed-off-by: Takashi Iwai <tiwai@suse.de> Link: https://lore.kernel.org/r/20200311071606.4485-1-tiwai@suse.de Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-11dmaengine: idxd: remove global token limit checkDave Jiang
The global token_limit is not tied to group tokens_reserved and tokens_allowed parameters. Remove the check in order to allow independent configuration. Fixes: c52ca478233c ("dmaengine: idxd: add configuration component of driver") Reported-by: Yixin Zhang <yixin.zhang@intel.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/158386266911.11066.7545764533072221536.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-11dmaengine: idxd: reflect shadow copy of traffic class programmingDave Jiang
The traffic class are set to -1 at initialization until the user programs them. If the user choose not to, the driver will program appropriate defaults. The driver also needs to update the shadowed copies of the values after doing the programming. Fixes: c52ca478233c ("dmaengine: idxd: add configuration component of driver") Reported-by: Yixin Zhang <yixin.zhang@intel.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/158386263076.10898.4586509576813094559.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-11dmaengine: Create debug directories for DMA devicesPeter Ujfalusi
Create a placeholder directory for each registered DMA device. DMA drivers can use the dmaengine_get_debugfs_root() call to get their debugfs root and can populate with custom files to aim debugging. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Link: https://lore.kernel.org/r/20200306142839.17910-4-peter.ujfalusi@ti.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-11dmaengine: ti: k3-udma: Implement custom dbg_summary_show for debugfsPeter Ujfalusi
With the custom dbg_summary_show the driver can show useful information about the used channels. dma0 (285c0000.dma-controller): number of channels: 24 dma1 (31150000.dma-controller): number of channels: 84 dma1chan0 | 2b00000.mcasp:tx (MEM_TO_DEV, tchan16 [0x1010 -> 0xc400], PDMA[ ACC32 BURST ], TR mode) dma1chan1 | 2b00000.mcasp:rx (DEV_TO_MEM, rchan16 [0x4400 -> 0x9010], PDMA[ ACC32 BURST ], TR mode) dma1chan2 | 2ba0000.mcasp:tx (MEM_TO_DEV, tchan17 [0x1011 -> 0xc507], PDMA[ ACC32 BURST ], TR mode) dma1chan3 | 2ba0000.mcasp:rx (DEV_TO_MEM, rchan17 [0x4507 -> 0x9011], PDMA[ ACC32 BURST ], TR mode) dma1chan4 | in-use (MEM_TO_MEM, chan0 pair [0x1000 -> 0x9000], PSI-L Native, TR mode) dma1chan5 | in-use (MEM_TO_MEM, chan1 pair [0x1001 -> 0x9001], PSI-L Native, TR mode) dma1chan6 | in-use (MEM_TO_MEM, chan4 pair [0x1004 -> 0x9004], PSI-L Native, TR mode) dma1chan7 | in-use (MEM_TO_MEM, chan5 pair [0x1005 -> 0x9005], PSI-L Native, TR mode) Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Link: https://lore.kernel.org/r/20200306142839.17910-3-peter.ujfalusi@ti.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-11dmaengine: Add basic debugfs supportPeter Ujfalusi
Via the /sys/kernel/debug/dmaengine/summary users can get information about the DMA devices and the used channels. Example output on am654-evm with audio using two channels and after running dmatest on 4 channels: dma0 (285c0000.dma-controller): number of channels: 96 dma1 (31150000.dma-controller): number of channels: 267 dma1chan0 | 2b00000.mcasp:tx dma1chan1 | 2b00000.mcasp:rx dma1chan2 | in-use dma1chan3 | in-use dma1chan4 | in-use dma1chan5 | in-use For slave channels we can show the device and the channel name a given channel is requested. For non slave devices the only information we know is that the channel is in use. DMA drivers can implement the optional dbg_summary_show callback to provide controller specific information instead of the generic one. It is easy to extend the generic dmaengine_summary_show() to print additional information about the used channels. I have taken the idea from gpiolib and clk subsystems. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Link: https://lore.kernel.org/r/20200306142839.17910-2-peter.ujfalusi@ti.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-11dmaengine: move .device_release missing log warning to debug levelVinod Koul
Dmaengine core warns the drivers registering for missing .device_release implementation. The warning is accurate for dmaengine controllers which hotplug but not for rest. So reduce this to a debug log. Link: https://lore.kernel.org/r/20200306135018.2286959-1-vkoul@kernel.org Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-06dmaengine: fsl-dpaa2-qdma: remove set but not used variable 'dpaa2_qdma'YueHaibing
drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c: In function dpaa2_qdma_shutdown: drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c:795:28: warning: variable dpaa2_qdma set but not used [-Wunused-but-set-variable] commit 3e0ca3c38dc2 ("dmaengine: fsl-dpaa2-qdma: Adding shutdown hook") involved this, remove it. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: YueHaibing <yuehaibing@huawei.com> Link: https://lore.kernel.org/r/20200303131347.28392-1-yuehaibing@huawei.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-02dmaengine: ti: edma: fix null dereference because of a typo in pointer nameColin Ian King
Currently there is a dereference of the null pointer m_ddev. This appears to be a typo on the pointer, I believe s_ddev should be used instead. Fix this by using the correct pointer. Fixes: eb0249d50153 ("dmaengine: ti: edma: Support for interleaved mem to mem transfer") Signed-off-by: Colin Ian King <colin.king@canonical.com> Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Addresses-Coverity: ("Explicit null dereferenced") Link: https://lore.kernel.org/r/20200226185921.351693-1-colin.king@canonical.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-02dmaengine: fsl-dpaa2-qdma: Adding shutdown hookPeng Ma
We need to ensure DMA engine could be stopped in order for kexec to start the next kernel. So add the shutdown operation support. Signed-off-by: Peng Ma <peng.ma@nxp.com> Link: https://lore.kernel.org/r/20200227042841.18358-1-peng.ma@nxp.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-02dmaengine: uniphier-xdmac: Add UniPhier external DMA controller driverKunihiko Hayashi
This adds external DMA controller driver implemented in Socionext UniPhier SoCs. This driver supports DMA_MEMCPY and DMA_SLAVE modes. Since this driver does not support the the way to transfer size unaligned to burst width, 'src_maxburst' or 'dst_maxburst' of dma_slave_config must be 1 to transfer arbitrary size. If transfer size is unaligned to burst size, the transfer isn't started and the driver displays an error message. Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com> Link: https://lore.kernel.org/r/1582271550-3403-3-git-send-email-hayashi.kunihiko@socionext.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-02dmaengine: ti: k3-udma: Implement support for atype (for virtualization)Peter Ujfalusi
The DT for virtualized hosts have dma-cells == 2 where the second parameter is the ATYPE for the channel. In case of dma-cells == 1 we can configure the ATYPE as 0 (reset value). The ATYPE defined for j721e are: 0: pointers are physical addresses (no translation) 1: pointers are intermediate addresses (PVU) 2: pointers are virtual addresses (SMMU) Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Link: https://lore.kernel.org/r/20200218143126.11361-3-peter.ujfalusi@ti.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-02dmaengine: idxd: expose general capabilities register in sysfsDave Jiang
There are some capabilities for the device that are interesting to user apps that are interacting directly with the device. Expose gencap register in sysfs to allow that information. Signed-off-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/158256729399.55526.10842505054968710547.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-03-02dmaengine: idxd: check return result from check_vma() in cdevDave Jiang
The returned result from the check_vma() function in the cdev ->mmap() call needs to be handled. Add the check and returning error. Fixes: 42d279f9137a ("dmaengine: idxd: add char driver to expose submission portal to userland") Reported-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/158264926659.9387.14325163515683047959.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: imx-sdma: Fix the event id check to include RX event for UART6Frieder Schrempf
On i.MX6UL/ULL and i.MX6SX the DMA event id for the RX channel of UART6 is '0'. To fix the broken DMA support for UART6, we change the check for event_id0 to include '0' as a valid id. Fixes: 1ec1e82f2510 ("dmaengine: Add Freescale i.MX SDMA support") Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de> Reviewed-by: Fabio Estevam <festevam@gmail.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200225082139.7646-1-frieder.schrempf@kontron.de Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Improve error message about DMA underflowDmitry Osipenko
Technically it is possible that DMA could be misconfigured in a way that cyclic DMA transfer is processed slower than it takes to complete the cycle and in this case the DMA is getting aborted with a not very informative message about the problem, let's improve it. Suggested-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-20-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Remove unused function argumentDmitry Osipenko
Remove unused function argument from handle_continuous_head_request(). Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-19-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Support COMPILE_TESTDmitry Osipenko
There is nothing arch-specific in the driver's code, so let's enable compile-testing for the driver. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-18-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Remove MODULE_ALIASDmitry Osipenko
Tegra APB DMA driver is an Open Firmware driver, so it uses OF alias naming scheme which overrides MODULE_ALIAS, meaning that MODULE_ALIAS does nothing and could be removed safely. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-17-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Allow to compile as a loadable kernel moduleDmitry Osipenko
The driver's removal was fixed by a recent commit and module load/unload is working well now, tested on Tegra30. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-16-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Add missing of_dma_controller_freeDmitry Osipenko
The DMA controller shall be released on driver's removal. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-15-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Clean up suspend-resumeDmitry Osipenko
It is enough to check whether hardware is busy on suspend and to reset it across of suspend-resume because: 1. Channel's configuration is fully re-programmed on each DMA transfer anyways. 2. Context save-restore of an active channel won't end up well without pausing transfer prior to the context's saving, but note that every channel shall be idling at the time of suspend, so save-restore is not needed at all. 3. The only case where context save-restore may be useful is when channel is in a paused state during suspend. But channel's pausing could be supported only on Tegra114+ and this functionality wasn't implemented by the driver for years now because there is no need for it in upstream kernel. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-14-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Keep clock enabled only during of DMA transferDmitry Osipenko
It's a bit impractical to enable hardware's clock at the time of DMA channel's allocation because most of DMA client drivers allocate DMA channel at the time of the driver's probing, and thus, DMA clock is kept always-enabled in practice, defeating the whole purpose of runtime PM. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-13-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Remove duplicated pending_sg_req checksDmitry Osipenko
There are few place in the code which check whether pending_sg_req list is empty despite of the check already being done. Let's remove the duplicated checks to keep code clean. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-12-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Remove assumptions about unavailable runtime PMDmitry Osipenko
The runtime PM is always available on all Tegra SoCs since the commit 40b2bb1b132a ("ARM: tegra: enforce PM requirement"), so there is no need to handle the case of unavailable RPM in the code anymore. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-11-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Remove unneeded initialization of tdc->config_initDmitry Osipenko
There is no need to re-initialize the already initialized variables. The tdc->config_init=false after driver's probe and after channel's freeing, so there is no need to re-initialize it on the channel's allocation. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-10-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Fix coding style problemsDmitry Osipenko
This patch fixes few dozens of coding style problems reported by checkpatch and prettifies code where makes sense. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-9-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Use devm_request_irqDmitry Osipenko
Use resource-managed variant of request_irq for brevity. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-8-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Use devm_platform_ioremap_resourceDmitry Osipenko
Use devm_platform_ioremap_resource to keep code cleaner a tad. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-7-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Clean up tasklet releasingDmitry Osipenko
There is no need to kill tasklet when driver's probe fails because tasklet can't be scheduled at this time. It is also cleaner to kill tasklet on channel's freeing rather than to kill it on driver's removal, otherwise tasklet could perform a dummy execution after channel's releasing, which isn't very nice. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-6-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Prevent race conditions on channel's freeingDmitry Osipenko
It's incorrect to check the channel's "busy" state without taking a lock. That shouldn't cause any real troubles, nevertheless it's always better not to have any race conditions in the code. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-5-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Implement synchronization hookDmitry Osipenko
The ISR tasklet could be kept scheduled after DMA transfer termination, let's add synchronization hook which blocks until tasklet is finished. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Link: https://lore.kernel.org/r/20200209163356.6439-4-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Prevent race conditions of tasklet vs free listDmitry Osipenko
The interrupt handler puts a half-completed DMA descriptor on a free list and then schedules tasklet to process bottom half of the descriptor that executes client's callback, this creates possibility to pick up the busy descriptor from the free list. Thus, let's disallow descriptor's re-use until it is fully processed. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20200209163356.6439-3-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: tegra-apb: Fix use-after-freeDmitry Osipenko
I was doing some experiments with I2C and noticed that Tegra APB DMA driver crashes sometime after I2C DMA transfer termination. The crash happens because tegra_dma_terminate_all() bails out immediately if pending list is empty, and thus, it doesn't release the half-completed descriptors which are getting re-used before ISR tasklet kicks-in. tegra-i2c 7000c400.i2c: DMA transfer timeout elants_i2c 0-0010: elants_i2c_irq: failed to read data: -110 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 142 at lib/list_debug.c:45 __list_del_entry_valid+0x45/0xac list_del corruption, ddbaac44->next is LIST_POISON1 (00000100) Modules linked in: CPU: 0 PID: 142 Comm: kworker/0:2 Not tainted 5.5.0-rc2-next-20191220-00175-gc3605715758d-dirty #538 Hardware name: NVIDIA Tegra SoC (Flattened Device Tree) Workqueue: events_freezable_power_ thermal_zone_device_check [<c010e5c5>] (unwind_backtrace) from [<c010a1c5>] (show_stack+0x11/0x14) [<c010a1c5>] (show_stack) from [<c0973925>] (dump_stack+0x85/0x94) [<c0973925>] (dump_stack) from [<c011f529>] (__warn+0xc1/0xc4) [<c011f529>] (__warn) from [<c011f7e9>] (warn_slowpath_fmt+0x61/0x78) [<c011f7e9>] (warn_slowpath_fmt) from [<c042497d>] (__list_del_entry_valid+0x45/0xac) [<c042497d>] (__list_del_entry_valid) from [<c047a87f>] (tegra_dma_tasklet+0x5b/0x154) [<c047a87f>] (tegra_dma_tasklet) from [<c0124799>] (tasklet_action_common.constprop.0+0x41/0x7c) [<c0124799>] (tasklet_action_common.constprop.0) from [<c01022ab>] (__do_softirq+0xd3/0x2a8) [<c01022ab>] (__do_softirq) from [<c0124683>] (irq_exit+0x7b/0x98) [<c0124683>] (irq_exit) from [<c0168c19>] (__handle_domain_irq+0x45/0x80) [<c0168c19>] (__handle_domain_irq) from [<c043e429>] (gic_handle_irq+0x45/0x7c) [<c043e429>] (gic_handle_irq) from [<c0101aa5>] (__irq_svc+0x65/0x94) Exception stack(0xde2ebb90 to 0xde2ebbd8) Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20200209163356.6439-2-digetx@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-15 01:59:05 +0000