From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue, 14 Feb 2006 18:50:31 +0100
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai-core] Handling PCI MSI interrupts
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To: Jeroen Van den Keybus <jeroen.vandenkeybus@domain.hid>
Cc: xenomai-core <xenomai@xenomai.org>

Jeroen Van den Keybus wrote:
> I'm having problems using MSI interrupts in Xenomai.
> 
> When using normal PCI interrupts, my PCI card + RTDM driver work 
> flawlessly. However, I noticed the following while trying to enable MSI 
> (by having Linux do all the administrative register-fill-ins using 
> pci_enable_msi()):
> 
> 1. The kernel is compiled for MSI. (PCI_CONFIG_MSI=yes)
> 2. My card correctly advertises the MSI capability (checked with 'lspci 
> -v').
> 3. I do get a new IRQ number in the pci_dev struct (217 instead of 193) 
> after invoking pci_enable_msi().
> 4. After pci_enable_smi(), 'lspci -v' correctly indicates that Message 
> Signalled Interrupts are now enabled (Enable+).
> 5. I can register the new IRQ with rtdm_request_irq(). Return value is 0.
> 6. The IRQ number appears in /proc/xenomai/irq.
> 7. I can enable the new IRQ with rtdm_irq_enable(). Return value is 0.
> 8. I can disable the new IRQ with rtdm_irq_disable(). Return value is 0.
> 9. I can unregister the new IRQ with rtdm_irq_free(). Return value is 0.
> 10. I'm able to do pci_disable_pci() successfully.
> 
> If I actually enable the card interrupt, it goes wrong after 7 after 
> arrival of the first interrupt. The ISR is executed (checked that), 
> which checks if the card was actually interrupting and, if so, returns 
> with RTDM_IRQ_ENABLE. After that, the machine is absolutely dead (frozen).

> 
> Any hints, suggestions or things I may check ?
>

Does calling rthal_disable_irq() instead of returning RTDM_IRQ_ENABLE, but rather 
0, prevents the freeze?


> Jeroen.
> 
> 
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-- 

Philippe.