linux-kernel - [PATCH v4 0/3] PCI: dwc: opitimaze RC host pci_fixup

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Message-Id: <20241008-pci_fixup_addr-v4-0-25e5200657bc@nxp.com>
Date: Tue, 08 Oct 2024 15:53:57 -0400
From: Frank Li <Frank.Li@....com>
To: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>, 
 Jingoo Han <jingoohan1@...il.com>, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, Richard Zhu <hongxing.zhu@....com>, 
 Lucas Stach <l.stach@...gutronix.de>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 imx@...ts.linux.dev, Frank Li <Frank.Li@....com>
Subject: [PATCH v4 0/3] PCI: dwc: opitimaze RC host pci_fixup_addr()

┌─────────┐                    ┌────────────┐
 ┌─────┐    │         │ 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@...00000 {
            compatible = "simple-bus";
            #address-cells = <1>;
            #size-cells = <1>;
            ranges = <0x5f000000 0x0 0x5f000000 0x21000000>,
                     <0x80000000 0x0 0x70000000 0x10000000>;

            pcie@...10000 {
                    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@...10000: 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@nxp.com/T/#mfc73ca113a69ad2c0294a2e629ecee3105b72973

The both pave the road to eliminate ugle cpu_fixup_addr() callback function.

Signed-off-by: Frank Li <Frank.Li@....com>
---
Changes in v4:
- Improve commit message by add driver source code path.
- Link to v3: https://lore.kernel.org/r/20240930-pci_fixup_addr-v3-0-80ee70352fc7@nxp.com

Changes in v3:
- see each patch
- Link to v2: https://lore.kernel.org/r/20240926-pci_fixup_addr-v2-0-e4524541edf4@nxp.com

Changes in v2:
- see each patch
- Link to v1: https://lore.kernel.org/r/20240924-pci_fixup_addr-v1-0-57d14a91ec4f@nxp.com

---
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@....com>