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pci_decode: IRQ reporting for MSI/MSI-X only devices

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Don't skip IRQ reporting if legacy IRQ/GSIs are not supported as the
device may support MSI/MSI-X exclusively.

The commit also enables reserved_memory reporting of devices without
IRQs.

Ref genodelabs/genode#4578
This commit is contained in:
Christian Helmuth 2022-10-05 15:04:34 +02:00
parent 8855e5bfc9
commit 08f1f94fcb
1 changed files with 38 additions and 26 deletions
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18
repos/os/src/app/pci_decode/main.cc
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@ -148,10 +148,22 @@ void Main::parse_pci_function(Bdf bdf,
});
/* IRQ pins count from 1-4 (INTA-D), zero means no IRQ defined */
if (!irq_pin)
return;
/*
* Only generate <irq> nodes if at least one of the following
* options is operational.
*
* - An IRQ pin from 1-4 (INTA-D) specifies legacy IRQ or GSI can be
* used, zero means no IRQ defined.
* - The used platform/kernel is MSI-capable and the device includes an
* MSI/MSI-X PCI capability.
*
* An <irq> node advertises (in decreasing priority) MSI-X, MSI, or
* legacy/GSI exclusively.
*/
bool const supports_irq = irq_pin != 0;
bool const supports_msi = msi_capable && (msi_x || msi);
if (supports_irq || supports_msi)
gen.node("irq", [&]
{
if (msi_capable && msi_x) {