This series introduces the new functions pci_epc_map_align(), pci_epc_mem_map() and pci_epc_mem_unmap() to improve handling of the PCI address mapping alignment constraints of endpoint controllers in a controller independent manner. The issue fixed is that the fixed alignment defined by the "align" field of struct pci_epc_features assumes that the alignment of the endpoint memory used to map a RC PCI address range is independent of the PCI address being mapped. But that is not the case for the rk3399 SoC controller: in endpoint mode, this controller uses the lower bits of the local endpoint memory address as the lower bits for the PCI addresses for data transfers. That is, when mapping local memory, one must take into account the number of bits of the RC PCI address that change from the start address of the mapping. To fix this, the new endpoint controller method .map_align is introduced and called from pci_epc_map_align(). This method is optional and for controllers that do not define it, the mapping information returned is based of the fixed alignment constraint as defined by the align feature. The functions pci_epc_mem_map() is a helper function which obtains mapping information, allocates endpoint controller memory according to the mapping size obtained and maps the memory. pci_epc_mem_map() unmaps and frees the endpoint memory. This series is organized as follows: - Patch 1 tidy up the epc core code - Patch 2 and 3 introduce the new map_align endpoint controller method and related epc functions. - Patch 4 to 6 modify the test endpoint driver to use these new functions and improve the code of this driver. - Finally, Patch 7 to 18 fix the rk3399 endpoint driver, defining a .map_align method for it and improving its overall code readability and features. Changes from v1: - Changed pci_epc_check_func() to pci_epc_function_is_valid() in patch 1. - Removed patch "PCI: endpoint: Improve pci_epc_mem_alloc_addr()" (former patch 2 of v1) - Various typos cleanups all over. Also fixed some blank space indentation. - Added review tags Damien Le Moal (17): PCI: endpoint: Introduce pci_epc_function_is_valid() PCI: endpoint: Introduce pci_epc_map_align() PCI: endpoint: Introduce pci_epc_mem_map()/unmap() PCI: endpoint: test: Use pci_epc_mem_map/unmap() PCI: endpoint: test: Synchronously cancel command handler work PCI: endpoint: test: Implement link_down event operation PCI: rockchip-ep: Fix address translation unit programming PCI: rockchip-ep: Use a macro to define EP controller .align feature PCI: rockchip-ep: Improve rockchip_pcie_ep_unmap_addr() PCI: rockchip-ep: Improve rockchip_pcie_ep_map_addr() PCI: rockchip-ep: Implement the map_align endpoint controller operation PCI: rockchip-ep: Refactor rockchip_pcie_ep_probe() memory allocations PCI: rockchip-ep: Refactor rockchip_pcie_ep_probe() MSI-X hiding PCI: rockchip-ep: Refactor endpoint link training enable PCI: rockship-ep: Introduce rockchip_pcie_ep_stop() PCI: rockchip-ep: Improve link training PCI: rockchip-ep: Handle PERST# signal in endpoint mode Wilfred Mallawa (1): dt-bindings: pci: rockchip,rk3399-pcie-ep: Add ep-gpios property .../bindings/pci/rockchip,rk3399-pcie-ep.yaml | 3 + drivers/pci/controller/pcie-rockchip-ep.c | 393 ++++++++++++++---- drivers/pci/controller/pcie-rockchip.c | 17 +- drivers/pci/controller/pcie-rockchip.h | 22 + drivers/pci/endpoint/functions/pci-epf-test.c | 390 +++++++++-------- drivers/pci/endpoint/pci-epc-core.c | 213 +++++++--- include/linux/pci-epc.h | 39 ++ 7 files changed, 768 insertions(+), 309 deletions(-) -- 2.44.0
