dmaengine: dw-edma: Add PCI bus address getter to the remote EP glue driver
authorSerge Semin <Sergey.Semin@baikalelectronics.ru>
Fri, 13 Jan 2023 17:13:50 +0000 (20:13 +0300)
committerLorenzo Pieralisi <lpieralisi@kernel.org>
Fri, 27 Jan 2023 16:15:33 +0000 (17:15 +0100)
commitaa92fa1e53befd7c0ff50f8346cb7980584f0beb
tree3bc5491edb9417578d5279ef68466377e59c3910
parent993d57bbaacf7ad7a742e51cb717e21e0eb4ef72
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>
drivers/dma/dw-edma/dw-edma-pcie.c