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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