Re: [PATCH 4/5] arm64: dts: imx95: add PCIe's msi-map and iommu-map property

Alexander Stein
2025-02-28T16:13:23Z

Hi Frank,

Am Freitag, 28. Februar 2025, 16:32:50 CET schrieb Frank Li:
> On Fri, Feb 28, 2025 at 10:08:58AM +0100, Alexander Stein wrote:
> > Hi Frank,
> >
> > Am Donnerstag, 27. Februar 2025, 17:39:47 CET schrieb Frank Li:
> > > On Thu, Feb 27, 2025 at 08:54:13AM +0100, Alexander Stein wrote:
> > > > Hi Frank,
> > > >
> > > > Am Mittwoch, 26. Februar 2025, 17:31:26 CET schrieb Frank Li:
> > > > > 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:
> > > > > > > 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.
> > > >
> > > > Just to be clear: This is not about enetc. This works fine here.
> > > >
> > > > > > Without msi-map-mask:
> > > > > > > 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:
> > > > > > > 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.
> > > >
> > > > With only msi-map removed, but smmu enabled:
> > > > > arm-smmu-v3 490d0000.iommu: event 0x10 received:
> > > > > arm-smmu-v3 490d0000.iommu: 0x0000001100000010
> > > > > arm-smmu-v3 490d0000.iommu: 0x0000020a00000000
> > > > > arm-smmu-v3 490d0000.iommu: 0x000000009b0cc000
> > > > > arm-smmu-v3 490d0000.iommu: 0x0000000000000000
> > > > > arm-smmu-v3 490d0000.iommu: event: F_TRANSLATION client: 0000:01:00.0 sid: 0x11 ssid: 0x0 iova: 0x9b0cc000 ipa: 0x0
> > > > > arm-smmu-v3 490d0000.iommu: priv data read s1 "Input address caused fault" stag: 0x0 r8169 0000:03:00.0
> > > > > enp3s0: Link is Down
> > > >
> > > > With only iommu-map removed, both smmu enabled or disabled:
> > > > > 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
> > > >
> > > > Only if smmu is disabled and msi-map is removed the driver probes
> > > > successfully:
> > > > > 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 160
> > > > > 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
> > > >
> > > > > >
> > > > > > Without msi-map/iommu-map:
> > > > > > > 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
> > > >
> > > > Just to be clear, without msi-map and iommu-map I get:
> > > > > imx6q-pcie 4c380000.pcie: rid: 0x0, sid: 0x18
> > > > > imx6q-pcie 4c380000.pcie: rid: 0x100, sid: 0x19
> > >
> > > Can you help dump register value PE0_LUT_CREQID offset 0x101 for your
> > > smmu-map or msi-map enable case
> >
> > I am assuming you meant offset 0x101c, as stated in the RM.
> > I added a dump directly before printing "PCI read failed" in r8169_main.c.
>
> Can you point me the code about where "error -EIO: PCI read failed"?

The error messages comes from [1]. As far as I can tell, this is the first
read after pcim_iomap_table().

> I tested nvme devices worked at both PCIE0 and PCIE1.
>
> Which PCI switch do you use?

This is a COTS MiniPCIe ethernet card [2]. If I'm reading correctly
the bridge seems to be a P17C9X20

Thanks and best regards
Alexander

[1] https://web.git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/net/ethernet/realtek/r8169_main.c?h=next-20250228#n5454
[2] https://www.delock.com/produkt/95237/merkmale.html?f=s
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