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Message-Id: <20240924-pci_fixup_addr-v1-0-57d14a91ec4f@nxp.com>
Date: Tue, 24 Sep 2024 17:54:18 -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 0/3] PCI: dwc: opitimaze RC host pci_fixup_addr()
┌─────────┐ ┌────────────┐
┌─────┐ │ │ IA: 0x8ff0_0000 │ │
│ CPU ├───►│ BUS ├─────────────────┐ │ PCI │
└─────┘ │ │ IA: 0x8ff8_0000 │ │ │
CPU Addr │ Fabric ├─────────────┐ │ │ Controller │
0x7000_0000 │ │ │ │ │ │
│ │ │ │ │ │ PCI Addr
│ │ │ └──► CfgSpace ─┼────────────►
│ ├─────────┐ │ │ │ 0
│ │ │ │ │ │
└─────────┘ │ └──────► IOSpace ─┼────────────►
│ │ │ 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>
---
Frank Li (3):
of: address: Add helper function to get untranslated 'ranges' information
PCI: dwc: Using for_each_of_range_untranslate to elminate cpu_addr_fixup()
PCI: imx6: Remove cpu_addr_fixup()
drivers/of/address.c | 33 ++++++++++++++++-------
drivers/pci/controller/dwc/pci-imx6.c | 21 +--------------
drivers/pci/controller/dwc/pcie-designware-host.c | 33 +++++++++++++++++++++++
include/linux/of_address.h | 9 ++++++-
4 files changed, 65 insertions(+), 31 deletions(-)
---
base-commit: 69940764dc1c429010d37cded159fadf1347d318
change-id: 20240924-pci_fixup_addr-a8568f9bbb34
Best regards,
---
Frank Li <Frank.Li@....com>
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