Add a helper function to add PCIe capability for Access Control Services (ACS)
ACS support in the associated root port is a prerequisite to be able to do
useful
passthrough with VFIO without Alex Williamson's pcie_acs_override kernel patch.
Signed-off-by: Knut Omang <knut.om...@oracle.com>
---
hw/pci/pcie.c | 14 ++++++++++++++
include/hw/pci/pcie.h | 1 +
include/hw/pci/pcie_regs.h | 4 ++++
3 files changed, 19 insertions(+)
diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index 230478f..18feff5 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -906,3 +906,17 @@ void pcie_ats_init(PCIDevice *dev, uint16_t offset)
pci_set_word(dev->wmask + dev->exp.ats_cap + PCI_ATS_CTRL, 0x800f);
}
+
+/* Add an ACS (Access Control Services) capability */
+void pcie_acs_init(PCIDevice *dev, uint16_t offset, uint8_t egress_ctrl_vec_sz)
+{
+ int ectrl_words = (egress_ctrl_vec_sz + 31) & ~31;
+ pcie_add_capability(dev, PCI_EXT_CAP_ID_ACS, PCI_ACS_VER,
+ offset, PCI_ACS_SIZEOF + ectrl_words);
+ pci_set_word(dev->config + offset + PCI_ACS_CAP,
+ PCI_ACS_SV | PCI_ACS_TB | PCI_ACS_RR | PCI_ACS_CR |
PCI_ACS_UF);
+ pci_set_word(dev->config + offset + PCI_ACS_CTRL,
+ PCI_ACS_SV | PCI_ACS_TB | PCI_ACS_RR | PCI_ACS_CR |
PCI_ACS_UF);
+ /* Make CTRL register writable */
+ memset(dev->wmask + offset + PCI_ACS_CTRL, 0xff, 2);
+}
diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h
index 5b82a0d..c2da148 100644
--- a/include/hw/pci/pcie.h
+++ b/include/hw/pci/pcie.h
@@ -129,6 +129,7 @@ void pcie_add_capability(PCIDevice *dev,
void pcie_sync_bridge_lnk(PCIDevice *dev);
void pcie_ari_init(PCIDevice *dev, uint16_t offset, uint16_t nextfn);
+void pcie_acs_init(PCIDevice *dev, uint16_t offset, uint8_t
egress_ctrl_vec_sz);
void pcie_dev_ser_num_init(PCIDevice *dev, uint16_t offset, uint64_t ser_num);
void pcie_ats_init(PCIDevice *dev, uint16_t offset);
diff --git a/include/hw/pci/pcie_regs.h b/include/hw/pci/pcie_regs.h
index ad4e780..5e7409c 100644
--- a/include/hw/pci/pcie_regs.h
+++ b/include/hw/pci/pcie_regs.h
@@ -175,4 +175,8 @@ typedef enum PCIExpLinkWidth {
PCI_ERR_COR_INTERNAL | \
PCI_ERR_COR_HL_OVERFLOW)
+/* ACS */
+#define PCI_ACS_VER 0x2
+#define PCI_ACS_SIZEOF 8
+
#endif /* QEMU_PCIE_REGS_H */
--
git-series 0.9.1
