MSI Interrupt is not generating in I.MX8QM board

[mallibeerala]

Hi,

I am configuring my I.MX8QM board as Root complex and my custom board is configured as endpoint.

I am able to write & read PCIe data between I.MX8QM board and my custom board.

Now I am trying MSI interrupt, MSI interrupt address and data mentioned as "0xbc000000, 0", I got these values in RC by using command "lspci -vv"

for testing msi interrupt generation, In I.MX8QM board I am writing 0 data into 0xbc000000 address location but I didn't get any msi interrupt.

Here MSI address is belongs ddr space, Is it OK.

Same procedure I am following in my layerscape board, there address and data mentioned as "0x15800000 and 0" and it is not in the ddr memory range and I am getting MSI interrupt while writing 0 into 0x15800000 address location.

Please help us to resolve this Issue.

Thanks & Regards,
Mallikarjuna

[jimmychan]

Could you tell me which version of BSP are you using?

[mallibeerala]

I am using kernel version - 5.15.32, which is lts.

[jimmychan]

Please refer to the iMX reference manual page 90. There is the memory layout of i.MX8QM pcie.

https://www.nxp.com/docs/en/reference-manual/IMX_REFERENCE_MANUAL.pdf

[mallibeerala]

Hi,

In Reference manual memory layout mentioned as below but MSI address is not available in below address region, it is available at 0xbc000000.

PCIeA
– PCIe host configuration space: 0x5f00_0000 – 0x5f00_ffff (64K bytes)
– PCIe device configuration space: 0x6ff0_0000 – 0x6ff7_ffff (512K bytes)
– PCIe IO space: 0x6ff8_0000 – 0x6ff8_ffff (64K bytes)
– PCIe memory space: 0x6000_0000 – 0x6fef_ffff (255M bytes)

Thanks,
Mallikarjuna

[jimmychan]

FYI.

https://community.nxp.com/t5/i-MX-Processors/How-to-generate-MSI-interrupt-on-i-MX6-in-PCIe-EP-endpo...

[mallibeerala]

Please provide example for I.MX8QM board, vector address is different for I.MX8QM and I.MX6 board.

Thanks & Regards,
Mallikarjuna