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pcie: Add helper to declare PASID capability for a pcie device

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Signed-off-by: Clement Mathieu--Drif <clement.mathieu--drif@eviden.com>
Message-Id: <20250520071823.764266-2-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 0f178860df
commit a8d178e149
3 changed files with 35 additions and 1 deletions
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25
hw/pci/pcie.c
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@ -1214,3 +1214,28 @@ void pcie_acs_reset(PCIDevice *dev)
pci_set_word(dev->config + dev->exp.acs_cap + PCI_ACS_CTRL, 0);
}
}
/* PASID */
void pcie_pasid_init(PCIDevice *dev, uint16_t offset, uint8_t pasid_width,
bool exec_perm, bool priv_mod)
{
static const uint16_t control_reg_rw_mask = 0x07;
uint16_t capability_reg;
assert(pasid_width <= PCI_EXT_CAP_PASID_MAX_WIDTH);
pcie_add_capability(dev, PCI_EXT_CAP_ID_PASID, PCI_PASID_VER, offset,
PCI_EXT_CAP_PASID_SIZEOF);
capability_reg = ((uint16_t)pasid_width) << PCI_PASID_CAP_WIDTH_SHIFT;
capability_reg |= exec_perm ? PCI_PASID_CAP_EXEC : 0;
capability_reg |= priv_mod ? PCI_PASID_CAP_PRIV : 0;
pci_set_word(dev->config + offset + PCI_PASID_CAP, capability_reg);
/* Everything is disabled by default */
pci_set_word(dev->config + offset + PCI_PASID_CTRL, 0);
pci_set_word(dev->wmask + offset + PCI_PASID_CTRL, control_reg_rw_mask);
dev->exp.pasid_cap = offset;
}