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Date: Tue, 8 Nov 2022 00:04:36 +0300 From: Serge Semin <Sergey.Semin@...kalelectronics.ru> To: Gustavo Pimentel <gustavo.pimentel@...opsys.com>, Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, Lorenzo Pieralisi <lorenzo.pieralisi@....com>, Cai Huoqing <cai.huoqing@...ux.dev>, Robin Murphy <robin.murphy@....com>, Jingoo Han <jingoohan1@...il.com>, Frank Li <Frank.Li@....com>, Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org> CC: Serge Semin <Sergey.Semin@...kalelectronics.ru>, Serge Semin <fancer.lancer@...il.com>, Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>, Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>, Krzysztof WilczyĆski <kw@...ux.com>, caihuoqing <caihuoqing@...du.com>, <linux-pci@...r.kernel.org>, <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: [PATCH v6 22/24] dmaengine: dw-edma: Bypass dma-ranges mapping for the local setup DW eDMA doesn't perform any translation of the traffic generated on the CPU/Application side. It just generates read/write AXI-bus requests with the specified addresses. But in case if the dma-ranges DT-property is specified for a platform device node, Linux will use it to create a mapping the PCIe-bus regions into the CPU memory ranges. This isn't what we want for the eDMA embedded into the locally accessed DW PCIe Root Port and End-point. In order to work that around let's set the chan_dma_dev flag for each DW eDMA channel thus forcing the client drivers to getting a custom dma-ranges-less parental device for the mappings. Note it will only work for the client drivers using the dmaengine_get_dma_device() method to get the parental DMA device. Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru> --- Changelog v2: - Fix the comment a bit to being clearer. (@Manivannan) Changelog v3: - Conditionally set dchan->dev->device.dma_coherent field since it can be missing on some platforms. (@Manivannan) - Remove Manivannan' rb and tb tags since the patch content has been changed. Changelog v6: - Directly call *_dma_configure() method on the child device used for the DMA buffers mapping. (@Robin) - Explicitly set the DMA-mask of the child device in the channel allocation proecedure. (@Robin) - Drop @Manivannan and @Vinod rb- and ab-tags due to significant patch content change. --- drivers/dma/dw-edma/dw-edma-core.c | 44 ++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c index e3671bfbe186..846518509753 100644 --- a/drivers/dma/dw-edma/dw-edma-core.c +++ b/drivers/dma/dw-edma/dw-edma-core.c @@ -6,9 +6,11 @@ * Author: Gustavo Pimentel <gustavo.pimentel@...opsys.com> */ +#include <linux/acpi.h> #include <linux/module.h> #include <linux/device.h> #include <linux/kernel.h> +#include <linux/of_device.h> #include <linux/dmaengine.h> #include <linux/err.h> #include <linux/interrupt.h> @@ -711,10 +713,52 @@ static irqreturn_t dw_edma_interrupt_common(int irq, void *data) static int dw_edma_alloc_chan_resources(struct dma_chan *dchan) { struct dw_edma_chan *chan = dchan2dw_edma_chan(dchan); + struct device *dev = chan->dw->chip->dev; + int ret; if (chan->status != EDMA_ST_IDLE) return -EBUSY; + /* Bypass the dma-ranges based memory regions mapping for the eDMA + * controlled from the CPU/Application side since in that case + * the local memory address is left untranslated. + */ + if (chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL) { + ret = dma_coerce_mask_and_coherent(&dchan->dev->device, + DMA_BIT_MASK(64)); + if (ret) { + ret = dma_coerce_mask_and_coherent(&dchan->dev->device, + DMA_BIT_MASK(32)); + if (ret) + return ret; + } + + if (dev_of_node(dev)) { + struct device_node *node = dev_of_node(dev); + + ret = of_dma_configure(&dchan->dev->device, node, true); + } else if (has_acpi_companion(dev)) { + struct acpi_device *adev = to_acpi_device_node(dev->fwnode); + + ret = acpi_dma_configure(&dchan->dev->device, + acpi_get_dma_attr(adev)); + } else { + ret = -EINVAL; + } + + if (ret) + return ret; + + if (dchan->dev->device.dma_range_map) { + kfree(dchan->dev->device.dma_range_map); + dchan->dev->device.dma_range_map = NULL; + } + + dchan->dev->chan_dma_dev = true; + } else { + dchan->dev->chan_dma_dev = false; + } + return 0; } -- 2.38.0
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