Can I debug the code using printk() in this open source code like in normal linux kernel code？

[wenhaopang]

Can I debug the code using printk() in this open source code like in normal linux kernel code？

[mtijanic]

Of course! We don't include any linux specific headers in the code that is meant to be cross-platform, but for local debugging that's no issue.

If you're in the nvidia.ko portion of the codebase (src/nvidia/...), portDbgPrintf() is generally a thin wrapper around printk() that you can readily use without including anything. Also NV_PRINTF(LEVEL_ERRORS, "...") behaves very similarly to printk() with some added functionality.

[wenhaopang]

Thanks for your guidance.

[wenhaopang]

Can I also view the output of portDbgPrintf() and NV_PRINTF() via dmesg or cat /proc/kmsg.

[mtijanic]

Yes. portDbgPrintf() should always show up in dmesg, while NV_PRINTF() by default only prints on LEVEL_ERROR and above. You can control how/when NV_PRINTF() actually prints using RmMsg, as described here: #197

[wenhaopang]

I understand, thanks.