Linux kernel build failed when CONFIG_PCIEASPM is OFF

[lihing1994]

Hi all,

I recently faced an issue where the NVMe 1.4 SSD is not working properly on the NVIDIA Jetson platform. In the Linux kernel boot log, I get the following error message:

[   46.404328] pcieport 0000:00:00.0: AER: Corrected error received: 0000:00:00.0
[   46.405508] pcieport 0000:00:00.0:   device [10de:1ad0] error status/mask=00000001/0000e000
[  110.499436] pcieport 0000:00:00.0: AER: Corrected error received: 0000:00:00.0
[  110.499735] pcieport 0000:00:00.0:   device [10de:1ad0] error status/mask=00000001/0000e000
[  122.408529] pcieport 0000:00:00.0: AER: Corrected error received: 0000:00:00.0
[  122.408878] pcieport 0000:00:00.0:   device [10de:1ad0] error status/mask=00000001/0000e000
[  139.936480] pcieport 0000:00:00.0: AER: Corrected error received: 0000:00:00.0
[  139.936843] pcieport 0000:00:00.0:   device [10de:1ad0] error status/mask=00000001/0000e000
[  189.417534] pcieport 0000:00:00.0: AER: Corrected error received: 0000:00:00.0
[  189.417871] pcieport 0000:00:00.0:   device [10de:1ad0] error status/mask=00000001/0000e000
[  215.884735] pcieport 0000:00:00.0: AER: Corrected error received: 0000:00:00.0
[  215.885062] pcieport 0000:00:00.0:   device [10de:1ad0] error status/mask=00000001/0000e000
[  225.355828] pcieport 0000:00:00.0: AER: Corrected error received: 0000:00:00.0
[  225.356245] pcieport 0000:00:00.0:   device [10de:1ad0] error status/mask=00000001/0000e000

• After some research, people suggested turning off CONFIG_PCIEASPM in the Linux kernel configuration.
• However, after I turned this configuration off, the pcie-tegra194.c file had a compiling error. It appears that the failure is due to the tegra_pcie_prepare_host function in pcie-tegra194.c calling the functions disable_aspm_l0s and disable_aspm_l10. These functions are defined only if CONFIG_PCIEASPM is enabled. (For details, see line #1181 and line #1305 in the same pcie-tegra194.c file.)
• I added the following two function signatures at line #1305 and the kernel build passed:

static inline void disable_aspm_l0s(struct tegra_pcie_dw *pcie) { return; }
static inline void disable_aspm_l10(struct tegra_pcie_dw *pcie) { return; }

• I am not 100% sure, but it seems like CONFIG_PCIEASPM does not need to be turned on, and source code in pcie-tegra194.c does use the #if defined to handle the situation when it is off. I think these two function definitions were simply omitted at line #1305.

[madisongh]

I think you're right. NVIDIA doesn't do much, if any, build testing with kernel configurations they don't use in their BSP, so it was probably just an oversight.