@@ -17,6 +17,7 @@
#include "hw/pci/pci_host.h"
#include "hw/qdev-properties.h"
#include "hw/pci/pci_bridge.h"
+#include "hw/cxl/cxl.h"
#include "qemu/range.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
@@ -56,6 +57,16 @@ DECLARE_INSTANCE_CHECKER(PXBDev, PXB_DEV,
DECLARE_INSTANCE_CHECKER(PXBDev, PXB_PCIE_DEV,
TYPE_PXB_PCIE_DEVICE)
+#define TYPE_PXB_CXL_DEVICE "pxb-cxl"
+DECLARE_INSTANCE_CHECKER(PXBDev, PXB_CXL_DEV,
+ TYPE_PXB_CXL_DEVICE)
+
+typedef struct CXLHost {
+ PCIHostState parent_obj;
+
+ CXLComponentState cxl_cstate;
+} CXLHost;
+
struct PXBDev {
/*< private >*/
PCIDevice parent_obj;
@@ -68,6 +79,11 @@ struct PXBDev {
static PXBDev *convert_to_pxb(PCIDevice *dev)
{
+ /* A CXL PXB's parent bus is PCIe, so the normal check won't work */
+ if (object_dynamic_cast(OBJECT(dev), TYPE_PXB_CXL_DEVICE)) {
+ return PXB_CXL_DEV(dev);
+ }
+
return pci_bus_is_express(pci_get_bus(dev))
? PXB_PCIE_DEV(dev) : PXB_DEV(dev);
}
@@ -112,11 +128,20 @@ static const TypeInfo pxb_pcie_bus_info = {
.class_init = pxb_bus_class_init,
};
+static const TypeInfo pxb_cxl_bus_info = {
+ .name = TYPE_PXB_CXL_BUS,
+ .parent = TYPE_CXL_BUS,
+ .instance_size = sizeof(PXBBus),
+ .class_init = pxb_bus_class_init,
+};
+
static const char *pxb_host_root_bus_path(PCIHostState *host_bridge,
PCIBus *rootbus)
{
- PXBBus *bus = pci_bus_is_express(rootbus) ?
- PXB_PCIE_BUS(rootbus) : PXB_BUS(rootbus);
+ PXBBus *bus = pci_bus_is_cxl(rootbus) ?
+ PXB_CXL_BUS(rootbus) :
+ pci_bus_is_express(rootbus) ? PXB_PCIE_BUS(rootbus) :
+ PXB_BUS(rootbus);
snprintf(bus->bus_path, 8, "0000:%02x", pxb_bus_num(rootbus));
return bus->bus_path;
@@ -218,6 +243,10 @@ static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin)
return pin - PCI_SLOT(pxb->devfn);
}
+static void pxb_dev_reset(DeviceState *dev)
+{
+}
+
static gint pxb_compare(gconstpointer a, gconstpointer b)
{
const PXBDev *pxb_a = a, *pxb_b = b;
@@ -389,13 +418,66 @@ static const TypeInfo pxb_pcie_dev_info = {
},
};
+static void pxb_cxl_dev_realize(PCIDevice *dev, Error **errp)
+{
+ MachineState *ms = MACHINE(qdev_get_machine());
+
+ /* A CXL PXB's parent bus is still PCIe */
+ if (!pci_bus_is_express(pci_get_bus(dev))) {
+ error_setg(errp, "pxb-cxl devices cannot reside on a PCI bus");
+ return;
+ }
+ if (!ms->cxl_devices_state->is_enabled) {
+ error_setg(errp, "Machine does not have cxl=on");
+ return;
+ }
+
+ pxb_dev_realize_common(dev, CXL, errp);
+ pxb_dev_reset(DEVICE(dev));
+}
+
+static void pxb_cxl_dev_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+ k->realize = pxb_cxl_dev_realize;
+ k->exit = pxb_dev_exitfn;
+ /*
+ * XXX: These types of bridges don't actually show up in the hierarchy so
+ * vendor, device, class, etc. ids are intentionally left out.
+ */
+
+ dc->desc = "CXL Host Bridge";
+ device_class_set_props(dc, pxb_dev_properties);
+ set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
+
+ /* Host bridges aren't hotpluggable. FIXME: spec reference */
+ dc->hotpluggable = false;
+ dc->reset = pxb_dev_reset;
+}
+
+static const TypeInfo pxb_cxl_dev_info = {
+ .name = TYPE_PXB_CXL_DEVICE,
+ .parent = TYPE_PCI_DEVICE,
+ .instance_size = sizeof(PXBDev),
+ .class_init = pxb_cxl_dev_class_init,
+ .interfaces =
+ (InterfaceInfo[]){
+ { INTERFACE_CONVENTIONAL_PCI_DEVICE },
+ {},
+ },
+};
+
static void pxb_register_types(void)
{
type_register_static(&pxb_bus_info);
type_register_static(&pxb_pcie_bus_info);
+ type_register_static(&pxb_cxl_bus_info);
type_register_static(&pxb_host_info);
type_register_static(&pxb_dev_info);
type_register_static(&pxb_pcie_dev_info);
+ type_register_static(&pxb_cxl_dev_info);
}
type_init(pxb_register_types)
@@ -229,6 +229,12 @@ static const TypeInfo pcie_bus_info = {
.class_init = pcie_bus_class_init,
};
+static const TypeInfo cxl_bus_info = {
+ .name = TYPE_CXL_BUS,
+ .parent = TYPE_PCIE_BUS,
+ .class_init = pcie_bus_class_init,
+};
+
static PCIBus *pci_find_bus_nr(PCIBus *bus, int bus_num);
static void pci_update_mappings(PCIDevice *d);
static void pci_irq_handler(void *opaque, int irq_num, int level);
@@ -2892,6 +2898,7 @@ static void pci_register_types(void)
{
type_register_static(&pci_bus_info);
type_register_static(&pcie_bus_info);
+ type_register_static(&cxl_bus_info);
type_register_static(&conventional_pci_interface_info);
type_register_static(&cxl_interface_info);
type_register_static(&pcie_interface_info);
@@ -410,6 +410,7 @@ typedef PCIINTxRoute (*pci_route_irq_fn)(void *opaque, int pin);
#define TYPE_PCI_BUS "PCI"
OBJECT_DECLARE_TYPE(PCIBus, PCIBusClass, PCI_BUS)
#define TYPE_PCIE_BUS "PCIE"
+#define TYPE_CXL_BUS "CXL"
typedef void (*pci_bus_dev_fn)(PCIBus *b, PCIDevice *d, void *opaque);
typedef void (*pci_bus_fn)(PCIBus *b, void *opaque);
@@ -769,6 +770,11 @@ static inline void pci_irq_pulse(PCIDevice *pci_dev)
pci_irq_deassert(pci_dev);
}
+static inline int pci_is_cxl(const PCIDevice *d)
+{
+ return d->cap_present & QEMU_PCIE_CAP_CXL;
+}
+
static inline int pci_is_express(const PCIDevice *d)
{
return d->cap_present & QEMU_PCI_CAP_EXPRESS;
@@ -93,6 +93,7 @@ ERROR_RULE_LIST = [
{'device':'pci-bridge', 'expected':True}, # Bridge chassis not specified. Each bridge is required to be assigned a unique chassis id > 0.
{'device':'pci-bridge-seat', 'expected':True}, # Bridge chassis not specified. Each bridge is required to be assigned a unique chassis id > 0.
{'device':'pxb', 'expected':True}, # Bridge chassis not specified. Each bridge is required to be assigned a unique chassis id > 0.
+ {'device':'pxb-cxl', 'expected':True}, # pxb-cxl devices cannot reside on a PCI bus.
{'device':'scsi-block', 'expected':True}, # drive property not set
{'device':'scsi-generic', 'expected':True}, # drive property not set
{'device':'scsi-hd', 'expected':True}, # drive property not set