Manually set MSI in Genode under base-foc failed

[Jilong Kuang - SISA]

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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