[v1,2/8] pcie: helper functions to check to check if PRI is enabled

Commit Message

CLEMENT MATHIEU--DRIF May 30, 2024, 12:25 p.m. UTC

pri_enabled can be used to check whether the capability is present and
enabled on a PCIe device

Signed-off-by: Clément Mathieu--Drif <[e-mail]>
---
 hw/pci/pcie.c         | 9 +++++++++
 include/hw/pci/pcie.h | 1 +
 2 files changed, 10 insertions(+)

Patch

diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index 053bca6949..3fb6588c31 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -1227,6 +1227,15 @@  void pcie_pri_init(PCIDevice *dev, uint16_t offset, uint32_t outstanding_pr_cap,
     dev->exp.pri_cap = offset;
 }
 
+bool pcie_pri_enabled(const PCIDevice *dev)
+{
+    if (!pci_is_express(dev) || !dev->exp.pri_cap) {
+        return false;
+    }
+    return (pci_get_word(dev->config + dev->exp.pri_cap + PCI_PRI_CTRL) &
+                PCI_PRI_CTRL_ENABLE) != 0;
+}
+
 bool pcie_pasid_enabled(const PCIDevice *dev)
 {
     if (!pci_is_express(dev) || !dev->exp.pasid_cap) {
diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h
index 198d6da817..b976fd739a 100644
--- a/include/hw/pci/pcie.h
+++ b/include/hw/pci/pcie.h
@@ -158,6 +158,7 @@  void pcie_pasid_init(PCIDevice *dev, uint16_t offset, uint8_t pasid_width,
 void pcie_pri_init(PCIDevice *dev, uint16_t offset, uint32_t outstanding_pr_cap,
                    bool prg_response_pasid_req);
 
+bool pcie_pri_enabled(const PCIDevice *dev);
 bool pcie_pasid_enabled(const PCIDevice *dev);
 bool pcie_ats_enabled(const PCIDevice *dev);
 #endif /* QEMU_PCIE_H */