Manually set MSI in Genode under base-foc failed

[Jilong Kuang]

Hi all,

 

I was trying to manually (hack) set MSI in Genode under base-foc but failed.
I'd like to describe my approach here and see if anyone can spot any
mistakes or missing parts?

 

First,  I added the Msi_flag (0x80000000) to the IRQ number in the
l4_icu_bind() and setup_irq_mode() functions in
genode/base-foc/src/core/irq_session_component.cc. So the kernel will know
this is a MSI-type IRQ. In addition, I added a l4_icu_msi_info() function to
return msg info for driver msi configuration (In my case it returns the
first available vector in IDT, which is 0x21)

 

Second, in my driver code, I do the following:

 

Genode::Irq_connection _irq(80); //random MSI number

Dev->config_msi(0x21); //configure the dev (e1000 card in my case) to use
MSI mode

while (1) {

  _irq.wait_for_irq();

  Dev->interrupt_handler();

}

 

However, I never saw any MSI-type interrupt triggered by Fiasco kernel.
After instrumenting kernel, I did see kernel created an MSI-type irq object
and the corresponding Irq_sender object and attached itself to the right
receiving thread (Interrupt_handler::handler_cap()).  But I don't know why
Irq_sender::kinvoke was not triggered in the kernel. 

 

Thank you very much for your help!

 

Best regards,

Jilong

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