Will be needed so there is a defined serial number for
information queries via the Switch CCI.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
v2:  Thanks to Philippe for review.
 - Keep to a fixed offset for the serial number capability.
   If it's not present then there will be a hole which is fine
   under the PCIE specification.
 - As per reply to review of v1, I've not moved the Null definition
   to a header and have kept it is a valid 'default'.

hw/pci-bridge/cxl_upstream.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/hw/pci-bridge/cxl_upstream.c b/hw/pci-bridge/cxl_upstream.c
index 2b9cf0cc97..a57806fb31 100644
--- a/hw/pci-bridge/cxl_upstream.c
+++ b/hw/pci-bridge/cxl_upstream.c
@@ -14,14 +14,21 @@
 #include "hw/pci/msi.h"
 #include "hw/pci/pcie.h"
 #include "hw/pci/pcie_port.h"
+/*
+ * Null value of all Fs suggested by IEEE RA guidelines for use of
+ * EU, OUI and CID
+ */
+#define UI64_NULL (~0ULL)
 
 #define CXL_UPSTREAM_PORT_MSI_NR_VECTOR 2
 
 #define CXL_UPSTREAM_PORT_MSI_OFFSET 0x70
 #define CXL_UPSTREAM_PORT_PCIE_CAP_OFFSET 0x90
 #define CXL_UPSTREAM_PORT_AER_OFFSET 0x100
-#define CXL_UPSTREAM_PORT_DVSEC_OFFSET \
+#define CXL_UPSTREAM_PORT_SN_OFFSET \
     (CXL_UPSTREAM_PORT_AER_OFFSET + PCI_ERR_SIZEOF)
+#define CXL_UPSTREAM_PORT_DVSEC_OFFSET \
+    (CXL_UPSTREAM_PORT_SN_OFFSET + PCI_EXT_CAP_DSN_SIZEOF)
 
 typedef struct CXLUpstreamPort {
     /*< private >*/
@@ -30,6 +37,7 @@ typedef struct CXLUpstreamPort {
     /*< public >*/
     CXLComponentState cxl_cstate;
     DOECap doe_cdat;
+    uint64_t sn;
 } CXLUpstreamPort;
 
 CXLComponentState *cxl_usp_to_cstate(CXLUpstreamPort *usp)
@@ -326,7 +334,9 @@ static void cxl_usp_realize(PCIDevice *d, Error **errp)
     if (rc) {
         goto err_cap;
     }
-
+    if (usp->sn != UI64_NULL) {
+        pcie_dev_ser_num_init(d, CXL_UPSTREAM_PORT_SN_OFFSET, usp->sn);
+    }
     cxl_cstate->dvsec_offset = CXL_UPSTREAM_PORT_DVSEC_OFFSET;
     cxl_cstate->pdev = d;
     build_dvsecs(cxl_cstate);
@@ -366,6 +376,7 @@ static void cxl_usp_exitfn(PCIDevice *d)
 }
 
 static Property cxl_upstream_props[] = {
+    DEFINE_PROP_UINT64("sn", CXLUpstreamPort, sn, UI64_NULL),
     DEFINE_PROP_STRING("cdat", CXLUpstreamPort, cxl_cstate.cdat.filename),
     DEFINE_PROP_END_OF_LIST()
 };
-- 
2.39.2