Message-ID: <47051102.fMDQidcC6G@steina-w>
Date: Fri, 28 Feb 2025 10:08:58 +0100
From: Alexander Stein <alexander.stein@...tq-group.com>
To: Frank Li <Frank.li@....com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>,
 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
 <devicetree@...r.kernel.org>,
 "open list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" <imx@...ts.linux.dev>,
 "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
 <linux-arm-kernel@...ts.infradead.org>,
 open list <linux-kernel@...r.kernel.org>, hongxing.zhu@....com
Subject:
 Re: [PATCH 4/5] arm64: dts: imx95: add PCIe's msi-map and iommu-map property

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@....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@...00000 {
> > > > >  			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@...00000: iommu-map, using mask 000001ff, id-base: 00000100, out-base: 00000011, length: 00000007, id: 00000300 -> 00000011
> > > > > OF: /soc/pcie@...00000: 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@...00000: iommu-map, using mask 000001ff, id-base: 00000100, out-base: 00000011, length: 00000007, id: 00000300 -> 00000011
> > > > > OF: /soc/pcie@...00000: 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@...00000: 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.
Unfortunately this only returns 0 for both PCIe devices, so I'm wondering
if this is correct.

> 2nd test.
> change IMX95_PE0_LUT_MASK to 0x1ff

Unfortunately I do not notice any effect/difference.

Best regards
Alexander
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