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pcie: Don't try triggering a LSI when not defined 

This patch skips [de]asserting a LSI interrupt if the device doesn't
have any LSI defined. Doing so would trigger an assert in
pci_irq_handler().

The PCIE root port implementation in qemu requests a LSI (INTA), but a
subclass may want to change that behavior since it's a valid
configuration. For example on the POWER8/POWER9/POWER10 systems, the
root bridge doesn't request any LSI.

Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20220408131303.147840-2-fbarrat@linux.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Frederic Barrat 2022-04-08 15:13:02 +02:00 committed by Daniel Henrique Barboza
parent 23bd5fc3ed
commit 2e8656710a
2 changed files with 4 additions and 3 deletions
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5
hw/pci/pcie.c
View File

@ -353,7 +353,7 @@ static void hotplug_event_notify(PCIDevice *dev)
msix_notify(dev, pcie_cap_flags_get_vector(dev)); msix_notify(dev, pcie_cap_flags_get_vector(dev));
} else if (msi_enabled(dev)) { } else if (msi_enabled(dev)) {
msi_notify(dev, pcie_cap_flags_get_vector(dev)); msi_notify(dev, pcie_cap_flags_get_vector(dev));
} else { } else if (pci_intx(dev) != -1) {
pci_set_irq(dev, dev->exp.hpev_notified); pci_set_irq(dev, dev->exp.hpev_notified);
} }
} }
@ -361,7 +361,8 @@ static void hotplug_event_notify(PCIDevice *dev)
static void hotplug_event_clear(PCIDevice *dev) static void hotplug_event_clear(PCIDevice *dev)
{ {
hotplug_event_update_event_status(dev); hotplug_event_update_event_status(dev);
if (!msix_enabled(dev) && !msi_enabled(dev) && !dev->exp.hpev_notified) { if (!msix_enabled(dev) && !msi_enabled(dev) && pci_intx(dev) != -1 &&
!dev->exp.hpev_notified) {
pci_irq_deassert(dev); pci_irq_deassert(dev);
} }
} }

2
hw/pci/pcie_aer.c
View File

@ -290,7 +290,7 @@ static void pcie_aer_root_notify(PCIDevice *dev)
msix_notify(dev, pcie_aer_root_get_vector(dev)); msix_notify(dev, pcie_aer_root_get_vector(dev));
} else if (msi_enabled(dev)) { } else if (msi_enabled(dev)) {
msi_notify(dev, pcie_aer_root_get_vector(dev)); msi_notify(dev, pcie_aer_root_get_vector(dev));
} else { } else if (pci_intx(dev) != -1) {
pci_irq_assert(dev); pci_irq_assert(dev);
} }
} }