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pcie: Helper functions to check if PASID is enabled

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pasid_enabled checks whether the capability is
present or not. If so, we read the configuration space to get
the status of the feature (enabled or not).

Signed-off-by: Clement Mathieu--Drif <clement.mathieu--drif@eviden.com>
Message-Id: <20250520071823.764266-3-clement.mathieu--drif@eviden.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
CLEMENT MATHIEU--DRIF 2025-05-20 07:18:51 +00:00 • committed by Michael S. Tsirkin
parent a8d178e149
commit 1e82e8a828
2 changed files with 11 additions and 0 deletions
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9
hw/pci/pcie.c
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@ -1239,3 +1239,12 @@ void pcie_pasid_init(PCIDevice *dev, uint16_t offset, uint8_t pasid_width,
dev->exp.pasid_cap = offset;
}
bool pcie_pasid_enabled(const PCIDevice *dev)
{
if (!pci_is_express(dev) || !dev->exp.pasid_cap) {
return false;
}
return (pci_get_word(dev->config + dev->exp.pasid_cap + PCI_PASID_CTRL) &
PCI_PASID_CTRL_ENABLE) != 0;
}