[PATCH v3 06/19] pcie: Helper functions to check if PASID is enabled

[CLEMENT MATHIEU--DRIF <clement.mathieu--drif@eviden.com>]

From: Clement Mathieu--Drif <clement.mathieu--drif@eviden.com>

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>
---
 hw/pci/pcie.c         | 9 +++++++++
 include/hw/pci/pcie.h | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index f42a256f15..8186d64234 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -1238,3 +1238,12 @@ 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;
+}
diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h
index aa040c3e97..63604ccc6e 100644
--- a/include/hw/pci/pcie.h
+++ b/include/hw/pci/pcie.h
@@ -156,4 +156,6 @@ void pcie_cap_slot_unplug_request_cb(HotplugHandler *hotplug_dev,
 
 void pcie_pasid_init(PCIDevice *dev, uint16_t offset, uint8_t pasid_width,
                      bool exec_perm, bool priv_mod);
+
+bool pcie_pasid_enabled(const PCIDevice *dev);
 #endif /* QEMU_PCIE_H */
-- 
2.48.1