On Wed, Feb 26, 2025 at 01:11:37PM +0100, Alexander Stein wrote:

Hi Frank,

Am Dienstag, 28. Januar 2025, 22:15:58 CET schrieb Frank Li:

quoted

Add PCIe's msi-map and iommu-map property because i.MX95 support smmu and
its.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
 arch/arm64/boot/dts/freescale/imx95.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx95.dtsi b/arch/arm64/boot/dts/freescale/imx95.dtsi
index 6b8470cb3461a..2cebeda43a52d 100644
--- a/arch/arm64/boot/dts/freescale/imx95.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx95.dtsi

@@ -1573,6 +1573,12 @@ pcie0: pcie@4c300000 {
 			assigned-clock-parents = <0>, <0>,
 						 <&scmi_clk IMX95_CLK_SYSPLL1_PFD1_DIV2>;
 			power-domains = <&scmi_devpd IMX95_PD_HSIO_TOP>;
+			/* pcie0's Devid(BIT[7:6]) is 0x00, stream id(BIT[5:0]) is 0x10~0x17 */
+			msi-map = <0x0 &its 0x10 0x1>,
+				  <0x100 &its 0x11 0x7>;

Aren't you missing msi-map-mask = <0x1ff>; here? Similar to pcie1.
Either way, with this change PCIe on pcie0 is not working anymore,
regardless of msi-map-mask.

Yes, it should have msi-map-mask. During my test, I have not enable enetc
so I have not found this problem.

Without msi-map-mask:

quoted

OF: /soc/pcie@4c300000: iommu-map, using mask 000001ff, id-base: 00000100, out-base: 00000011, length: 00000007, id: 00000300 -> 00000011
OF: /soc/pcie@4c300000: no msi-map translation for id 0x300 on (null)
r8169 0000:03:00.0: error -EINVAL: enable failure
r8169 0000:03:00.0: probe with driver r8169 failed with error -22

With msi-map-mask:

quoted

OF: /soc/pcie@4c300000: iommu-map, using mask 000001ff, id-base: 00000100, out-base: 00000011, length: 00000007, id: 00000300 -> 00000011
OF: /soc/pcie@4c300000: msi-map, using mask 000001ff, id-base: 00000100, out-base: 00000011, length: 00000007, id: 00000300 -> 00000011
r8169 0000:03:00.0: enabling device (0000 -> 0003)
r8169 0000:03:00.0: enabling Mem-Wr-Inval
r8169 0000:03:00.0: error -EIO: PCI read failed
r8169 0000:03:00.0: probe with driver r8169 failed with error -5

Can you try remove iommu-map and keep msi-map? then remove msi-map and
keep iommu-map to check which one cause this problem.

Without msi-map/iommu-map:

quoted

r8169 0000:03:00.0: enabling device (0000 -> 0003)
r8169 0000:03:00.0: enabling Mem-Wr-Inval
r8169 0000:03:00.0 eth0: RTL8168g/8111g, d8:9d:b9:00:16:10, XID 4c0, IRQ 166
r8169 0000:03:00.0 eth0: jumbo features [frames: 9194 bytes, tx checksumming: ko]
r8169 0000:03:00.0 enp3s0: renamed from eth0
r8169 0000:03:00.0: enabling bus mastering
r8169 0000:03:00.0 enp3s0: Link is Down

pcie1 works as expected. But this is only a single PCIe device, rather than
having a PCIe bridge.
Any idea what's wrong here?

Can you help dump more information at for PCIe bridge case:

imx_pcie_add_lut(), need rid and sid information.
drivers/pci/controller/dwc/pci-imx6.c

Best regards,
Alexander

quoted

+			iommu-map = <0x000 &smmu 0x10 0x1>,
+				    <0x100 &smmu 0x11 0x7>;
+			iommu-map-mask = <0x1ff>;
 			fsl,max-link-speed = <3>;
 			status = "disabled";
 		};

@@ -1640,6 +1646,14 @@ pcie1: pcie@4c380000 {
 			assigned-clock-parents = <0>, <0>,
 						 <&scmi_clk IMX95_CLK_SYSPLL1_PFD1_DIV2>;
 			power-domains = <&scmi_devpd IMX95_PD_HSIO_TOP>;
+			/* pcie1's Devid(BIT[7:6]) is 0x10, stream id(BIT[5:0]) is 0x18~0x1f */
+			msi-map = <0x0 &its 0x98 0x1>,
+				  <0x100 &its 0x99 0x7>;
+			msi-map-mask = <0x1ff>;
+			/* smmu have not Devid(BIT[7:6]) */
+			iommu-map = <0x000 &smmu 0x18 0x1>,
+				    <0x100 &smmu 0x19 0x7>;
+			iommu-map-mask = <0x1ff>;
 			fsl,max-link-speed = <3>;
 			status = "disabled";
 		};

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