Tracing built-in drivers ?

[Jay Aurabind]

Hi,

I know I can use ftrace or perf to do tracing on modules that I can
load from the userspace. But what if I want to do tracing on a driver
which is built in ? For example, i915. There wouldnt be any userspace
to trigger a trace when  it does an init. Even if I recompile i915 as
a module, I am not able to unload it.

Are there any specific tools or techniques for doing this ?

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Thanks and Regards,
Aurabindo J