From aa92fa1e53befd7c0ff50f8346cb7980584f0beb Mon Sep 17 00:00:00 2001 From: Serge Semin Date: Fri, 13 Jan 2023 20:13:50 +0300 Subject: [PATCH] dmaengine: dw-edma: Add PCI bus address getter to the remote EP glue driver The Synopsys PCIe Endpoint IP prototype kit can be attached via any PCI host controller, including one where the PCI bus address space is different from the CPU address space. Therefore, we need to make sure the source and destination addresses of the DMA slave devices are converted to the PCI bus address space; otherwise DMA transactions may cause memory corruption. Add a new dw_edma_pcie_address() interface to perform this translation by using pcibios_resource_to_bus(). Link: https://lore.kernel.org/r/20230113171409.30470-9-Sergey.Semin@baikalelectronics.ru Fixes: 41aaff2a2ac0 ("dmaengine: Add Synopsys eDMA IP PCIe glue-logic") Tested-by: Manivannan Sadhasivam Signed-off-by: Serge Semin Signed-off-by: Lorenzo Pieralisi Signed-off-by: Bjorn Helgaas Reviewed-by: Manivannan Sadhasivam Acked-by: Vinod Koul --- drivers/dma/dw-edma/dw-edma-pcie.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/dma/dw-edma/dw-edma-pcie.c b/drivers/dma/dw-edma/dw-edma-pcie.c index 04c95cb..f530bac 100644 --- a/drivers/dma/dw-edma/dw-edma-pcie.c +++ b/drivers/dma/dw-edma/dw-edma-pcie.c @@ -95,8 +95,23 @@ static int dw_edma_pcie_irq_vector(struct device *dev, unsigned int nr) return pci_irq_vector(to_pci_dev(dev), nr); } +static u64 dw_edma_pcie_address(struct device *dev, phys_addr_t cpu_addr) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct pci_bus_region region; + struct resource res = { + .flags = IORESOURCE_MEM, + .start = cpu_addr, + .end = cpu_addr, + }; + + pcibios_resource_to_bus(pdev->bus, ®ion, &res); + return region.start; +} + static const struct dw_edma_core_ops dw_edma_pcie_core_ops = { .irq_vector = dw_edma_pcie_irq_vector, + .pci_address = dw_edma_pcie_address, }; static void dw_edma_pcie_get_vsec_dma_data(struct pci_dev *pdev, -- 2.7.4