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hw/pci: Trace IRQ routing on PCI topology

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Trace how IRQ are rooted from EP to RC.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230211152239.88106-3-philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Philippe Mathieu-Daudé 2023-02-11 16:22:39 +01:00 • committed by Michael S. Tsirkin
parent 9c1916057a
commit 28566eab2d
2 changed files with 9 additions and 0 deletions
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8
hw/pci/pci.c
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@ -279,9 +279,13 @@ static void pci_change_irq_level(PCIDevice *pci_dev, int irq_num, int change)
{
PCIBus *bus;
for (;;) {
int dev_irq = irq_num;
bus = pci_get_bus(pci_dev);
assert(bus->map_irq);
irq_num = bus->map_irq(pci_dev, irq_num);
trace_pci_route_irq(dev_irq, DEVICE(pci_dev)->canonical_path, irq_num,
pci_bus_is_root(bus) ? "root-complex"
: DEVICE(bus->parent_dev)->canonical_path);
if (bus->set_irq)
break;
pci_dev = bus->parent_dev;
@ -1600,8 +1604,12 @@ PCIINTxRoute pci_device_route_intx_to_irq(PCIDevice *dev, int pin)
PCIBus *bus;
do {
int dev_irq = pin;
bus = pci_get_bus(dev);
pin = bus->map_irq(dev, pin);
trace_pci_route_irq(dev_irq, DEVICE(dev)->canonical_path, pin,
pci_bus_is_root(bus) ? "root-complex"
: DEVICE(bus->parent_dev)->canonical_path);
dev = bus->parent_dev;
} while (dev);