[Qemu-devel] [PATCH] pcie: Add endpoint capability initialization wrapper

[Alex Williamson <alex.williamson@redhat.com>]

Fix the awkward API of mangling the caller specified PCIe type and
just provide an interface to initialize an endpoint device.  This
will pick either a regular endpoint or integrated endpoint based on
the bus and return pcie_cap_init to doing exactly what is asked.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
 hw/pci/pcie.c     |   29 ++++++++++++++++-------------
 hw/pci/pcie.h     |    1 +
 hw/usb/hcd-xhci.c |    2 +-
 3 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index bcfbae4..62bd0b8 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -48,19 +48,6 @@ int pcie_cap_init(PCIDevice *dev, uint8_t offset, uint8_t type, uint8_t port)
 
     assert(pci_is_express(dev));
 
-    /*
-     * Mangle type to convert Endpoints to Root Complex Integrated Endpoints.
-     * Windows will report Code 10 (device cannot start) for regular Endpoints
-     * on the Root Complex.
-     */
-    if (pci_bus_is_express(dev->bus) && pci_bus_is_root(dev->bus)) {
-        switch (type) {
-        case PCI_EXP_TYPE_ENDPOINT:
-            type = PCI_EXP_TYPE_RC_END;
-            break;
-        }
-    }
-
     pos = pci_add_capability(dev, PCI_CAP_ID_EXP, offset,
                                  PCI_EXP_VER2_SIZEOF);
     if (pos < 0) {
@@ -100,6 +87,22 @@ int pcie_cap_init(PCIDevice *dev, uint8_t offset, uint8_t type, uint8_t port)
     return pos;
 }
 
+int pcie_endpoint_cap_init(PCIDevice *dev, uint8_t offset)
+{
+    uint8_t type = PCI_EXP_TYPE_ENDPOINT;
+
+    /*
+     * Windows guests will report Code 10, device cannot start, if
+     * a regular Endpoint type is exposed on a root complex.  These
+     * should instead be Root Complex Integrated Endpoints.
+     */
+    if (pci_bus_is_express(dev->bus) && pci_bus_is_root(dev->bus)) {
+        type = PCI_EXP_TYPE_RC_END;
+    }
+
+    return pcie_cap_init(dev, offset, type, 0);
+}
+
 void pcie_cap_exit(PCIDevice *dev)
 {
     pci_del_capability(dev, PCI_CAP_ID_EXP, PCI_EXP_VER2_SIZEOF);
diff --git a/hw/pci/pcie.h b/hw/pci/pcie.h
index 31604e2..c010007 100644
--- a/hw/pci/pcie.h
+++ b/hw/pci/pcie.h
@@ -95,6 +95,7 @@ struct PCIExpressDevice {
 
 /* PCI express capability helper functions */
 int pcie_cap_init(PCIDevice *dev, uint8_t offset, uint8_t type, uint8_t port);
+int pcie_endpoint_cap_init(PCIDevice *dev, uint8_t offset);
 void pcie_cap_exit(PCIDevice *dev);
 uint8_t pcie_cap_get_type(const PCIDevice *dev);
 void pcie_cap_flags_set_vector(PCIDevice *dev, uint8_t vector);
diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index 07afdee..5aa342b 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -3332,7 +3332,7 @@ static int usb_xhci_initfn(struct PCIDevice *dev)
                      PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64,
                      &xhci->mem);
 
-    ret = pcie_cap_init(&xhci->pci_dev, 0xa0, PCI_EXP_TYPE_ENDPOINT, 0);
+    ret = pcie_endpoint_cap_init(&xhci->pci_dev, 0xa0);
     assert(ret >= 0);
 
     if (xhci->flags & (1 << XHCI_FLAG_USE_MSI)) {