[PATCH] hw/pci-bridge/cxl-upstream: Add serial number extended capability support

[Jonathan Cameron via <qemu-devel@nongnu.org>]

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>
---
No ordering dependencies wrt to other CXL patch sets.

Whilst we 'need' it for the Switch CCI set it is valid without
it and aligns with existing EP serial number support. Seems sensible
to upstream this first and reduce my out of tree backlog a little!

 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..15c4d84a56 100644
--- a/hw/pci-bridge/cxl_upstream.c
+++ b/hw/pci-bridge/cxl_upstream.c
@@ -14,6 +14,11 @@
 #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
 
@@ -30,6 +35,7 @@ typedef struct CXLUpstreamPort {
     /*< public >*/
     CXLComponentState cxl_cstate;
     DOECap doe_cdat;
+    uint64_t sn;
 } CXLUpstreamPort;
 
 CXLComponentState *cxl_usp_to_cstate(CXLUpstreamPort *usp)
@@ -326,8 +332,12 @@ static void cxl_usp_realize(PCIDevice *d, Error **errp)
     if (rc) {
         goto err_cap;
     }
-
-    cxl_cstate->dvsec_offset = CXL_UPSTREAM_PORT_DVSEC_OFFSET;
+    if (usp->sn != UI64_NULL) {
+        pcie_dev_ser_num_init(d, CXL_UPSTREAM_PORT_DVSEC_OFFSET, usp->sn);
+        cxl_cstate->dvsec_offset = CXL_UPSTREAM_PORT_DVSEC_OFFSET + 0x0c;
+    } else {
+        cxl_cstate->dvsec_offset = CXL_UPSTREAM_PORT_DVSEC_OFFSET;
+    }
     cxl_cstate->pdev = d;
     build_dvsecs(cxl_cstate);
     cxl_component_register_block_init(OBJECT(d), cxl_cstate, TYPE_CXL_USP);
@@ -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