@@ -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,
In general the Synopsys PCIe EndPoint IP prototype kit can be attached to a PCIe bus with any PCIe Host controller including to the one with distinctive from CPU address space. Due to that we need to make sure that the source and destination addresses of the DMA-slave devices are properly converted to the PCIe bus address space, otherwise the DMA transaction will not only work as expected, but may cause the memory corruption with subsequent system crash. Let's do that by introducing a new dw_edma_pcie_address() method defined in the dw-edma-pcie.c, which will perform the denoted translation by using the pcibios_resource_to_bus() method. Fixes: 41aaff2a2ac0 ("dmaengine: Add Synopsys eDMA IP PCIe glue-logic") Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> --- Note this patch depends on the patch "dmaengine: dw-edma: Add CPU to PCIe bus address translation" from this series. --- drivers/dma/dw-edma/dw-edma-pcie.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)