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authorSerge Semin <Sergey.Semin@baikalelectronics.ru>2023-01-13 20:13:50 +0300
committerLorenzo Pieralisi <lpieralisi@kernel.org>2023-01-27 19:15:33 +0300
commitaa92fa1e53befd7c0ff50f8346cb7980584f0beb (patch)
tree3bc5491edb9417578d5279ef68466377e59c3910 /drivers/dma
parent993d57bbaacf7ad7a742e51cb717e21e0eb4ef72 (diff)
downloadlinux-aa92fa1e53befd7c0ff50f8346cb7980584f0beb.tar.xz
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 <manivannan.sadhasivam@linaro.org> Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Acked-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/dw-edma/dw-edma-pcie.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/dma/dw-edma/dw-edma-pcie.c b/drivers/dma/dw-edma/dw-edma-pcie.c
index 04c95cba1244..f530bacfd716 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, &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,