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hw/pci: Have PCI_BUS implement TYPE_FW_CFG_DATA_GENERATOR_INTERFACE

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The FW_CFG_DATA_GENERATOR interface allows any object to
produce a blob of data consumable by the fw_cfg device.
Implement that for PCI bus objects.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20241213133352.10915-5-philmd@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2024-12-06 17:41:40 +01:00
parent 4016adc74a
commit 59c5eea5c7
1 changed files with 37 additions and 0 deletions
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37
hw/pci/pci.c
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@ -46,6 +46,7 @@
#include "hw/pci/msix.h"
#include "hw/hotplug.h"
#include "hw/boards.h"
#include "hw/nvram/fw_cfg.h"
#include "qapi/error.h"
#include "qemu/cutils.h"
#include "pci-internal.h"
@ -216,11 +217,41 @@ static uint16_t pcibus_numa_node(PCIBus *bus)
return NUMA_NODE_UNASSIGNED;
}
static GByteArray *pci_bus_fw_cfg_gen_data(Object *obj, Error **errp)
{
PCIBus *bus = PCI_BUS(obj);
GByteArray *byte_array;
uint64_t extra_hosts = 0;
if (!bus) {
return NULL;
}
QLIST_FOREACH(bus, &bus->child, sibling) {
/* look for expander root buses */
if (pci_bus_is_root(bus)) {
extra_hosts++;
}
}
if (!extra_hosts) {
return NULL;
}
extra_hosts = cpu_to_le64(extra_hosts);
byte_array = g_byte_array_new();
g_byte_array_append(byte_array,
(const void *)&extra_hosts, sizeof(extra_hosts));
return byte_array;
}
static void pci_bus_class_init(ObjectClass *klass, void *data)
{
BusClass *k = BUS_CLASS(klass);
PCIBusClass *pbc = PCI_BUS_CLASS(klass);
ResettableClass *rc = RESETTABLE_CLASS(klass);
FWCfgDataGeneratorClass *fwgc = FW_CFG_DATA_GENERATOR_CLASS(klass);
k->print_dev = pcibus_dev_print;
k->get_dev_path = pcibus_get_dev_path;
@ -232,6 +263,8 @@ static void pci_bus_class_init(ObjectClass *klass, void *data)
pbc->bus_num = pcibus_num;
pbc->numa_node = pcibus_numa_node;
fwgc->get_data = pci_bus_fw_cfg_gen_data;
}
static const TypeInfo pci_bus_info = {
@ -240,6 +273,10 @@ static const TypeInfo pci_bus_info = {
.instance_size = sizeof(PCIBus),
.class_size = sizeof(PCIBusClass),
.class_init = pci_bus_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_FW_CFG_DATA_GENERATOR_INTERFACE },
{ }
}
};
static const TypeInfo cxl_interface_info = {