On Mon, Sep 30, 2024 at 02:44:52PM -0400, Frank Li wrote:
> ┌─────────┐ ┌────────────┐
> ┌─────┐ │ │ IA: 0x8ff0_0000 │ │
> │ CPU ├───►│ ┌────►├─────────────────┐ │ PCI │
> └─────┘ │ │ │ IA: 0x8ff8_0000 │ │ │
> CPU Addr │ │ ┌─►├─────────────┐ │ │ Controller │
> 0x7ff0_0000─┼───┘ │ │ │ │ │ │
> │ │ │ │ │ │ │ PCI Addr
> 0x7ff8_0000─┼──────┘ │ │ └──► CfgSpace ─┼────────────►
> │ │ │ │ │ 0
> 0x7000_0000─┼────────►├─────────┐ │ │ │
> └─────────┘ │ └──────► IOSpace ─┼────────────►
> BUS Fabric │ │ │ 0
> │ │ │
> └──────────► MemSpace ─┼────────────►
> IA: 0x8000_0000 │ │ 0x8000_0000
> └────────────┘
>
> Current dwc implimemnt, pci_fixup_addr() call back is needed when bus
> fabric convert cpu address before send to PCIe controller.
>
> bus@5f000000 {
> compatible = "simple-bus";
> #address-cells = <1>;
> #size-cells = <1>;
> ranges = <0x5f000000 0x0 0x5f000000 0x21000000>,
> <0x80000000 0x0 0x70000000 0x10000000>;
>
> pcie@5f010000 {
> compatible = "fsl,imx8q-pcie";
> reg = <0x5f010000 0x10000>, <0x8ff00000 0x80000>;
> reg-names = "dbi", "config";
> #address-cells = <3>;
> #size-cells = <2>;
> device_type = "pci";
> bus-range = <0x00 0xff>;
> ranges = <0x81000000 0 0x00000000 0x8ff80000 0 0x00010000>,
> <0x82000000 0 0x80000000 0x80000000 0 0x0ff00000>;
> ...
> };
> };
>
> Device tree already can descript all address translate. Some hardware
> driver implement fixup function by mask some bits of cpu address. Last
> pci-imx6.c are little bit better by fetch memory resource's offset to do
> fixup.
>
> static u64 imx_pcie_cpu_addr_fixup(struct dw_pcie *pcie, u64 cpu_addr)
> {
> ...
> entry = resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM);
> return cpu_addr - entry->offset;
> }
>
> But it is not good by using IORESOURCE_MEM to fix up io/cfg address map
> although address translate is the same as IORESOURCE_MEM.
>
> This patches to fetch untranslate range information for PCIe controller
> (pcie@5f010000: ranges). So current config ATU without cpu_fixup_addr().
>
> EP side patch:
> https://lore.kernel.org/linux-pci/20240923-pcie_ep_range-v2-0-78d2ea434d9f@xxxxxxx/T/#mfc73ca113a69ad2c0294a2e629ecee3105b72973
>
> The both pave the road to eliminate ugle cpu_fixup_addr() callback function.
>
> Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> ---
> Changes in v3:
> - see each patch
You should make the life easier for the reviewer, not hard. Please summarise
what has changed since the last version.
- Mani
> - Link to v2: https://lore.kernel.org/r/20240926-pci_fixup_addr-v2-0-e4524541edf4@xxxxxxx
>
> Changes in v2:
> - see each patch
> - Link to v1: https://lore.kernel.org/r/20240924-pci_fixup_addr-v1-0-57d14a91ec4f@xxxxxxx
>
> ---
> Frank Li (3):
> of: address: Add parent_bus_addr to struct of_pci_range
> PCI: dwc: Using parent_bus_addr in of_range to eliminate cpu_addr_fixup()
> PCI: imx6: Remove cpu_addr_fixup()
>
> drivers/of/address.c | 2 ++
> drivers/pci/controller/dwc/pci-imx6.c | 22 ++----------
> drivers/pci/controller/dwc/pcie-designware-host.c | 42 +++++++++++++++++++++++
> drivers/pci/controller/dwc/pcie-designware.h | 8 +++++
> include/linux/of_address.h | 1 +
> 5 files changed, 55 insertions(+), 20 deletions(-)
> ---
> base-commit: 69940764dc1c429010d37cded159fadf1347d318
> change-id: 20240924-pci_fixup_addr-a8568f9bbb34
>
> Best regards,
> ---
> Frank Li <Frank.Li@xxxxxxx>
>
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