Commit aa92fa1e authored by Serge Semin's avatar Serge Semin Committed by Lorenzo Pieralisi
Browse files

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: 41aaff2a ("dmaengine: Add Synopsys eDMA IP PCIe glue-logic")
Tested-by: default avatarManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: default avatarSerge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: default avatarLorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: default avatarVinod Koul <vkoul@kernel.org>
parent 993d57bb

drivers/dma/dw-edma/dw-edma-pcie.c

+15 −0
Original line number Diff line number Diff line
@@ -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, &region, &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,