2 * PCI Expander Bridge Device Emulation
4 * Copyright (C) 2015 Red Hat Inc
7 * Marcel Apfelbaum <marcel@redhat.com>
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
13 #include "qemu/osdep.h"
14 #include "qapi/error.h"
15 #include "hw/pci/pci.h"
16 #include "hw/pci/pci_bus.h"
17 #include "hw/pci/pci_host.h"
18 #include "hw/pci/pci_bridge.h"
19 #include "qemu/range.h"
20 #include "qemu/error-report.h"
21 #include "sysemu/numa.h"
23 #define TYPE_PXB_BUS "pxb-bus"
24 #define PXB_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_BUS)
26 #define TYPE_PXB_PCIE_BUS "pxb-pcie-bus"
27 #define PXB_PCIE_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_PCIE_BUS)
29 typedef struct PXBBus {
37 #define TYPE_PXB_DEVICE "pxb"
38 #define PXB_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_DEVICE)
40 #define TYPE_PXB_PCIE_DEVICE "pxb-pcie"
41 #define PXB_PCIE_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_PCIE_DEVICE)
43 typedef struct PXBDev {
52 static PXBDev *convert_to_pxb(PCIDevice *dev)
54 return pci_bus_is_express(pci_get_bus(dev))
55 ? PXB_PCIE_DEV(dev) : PXB_DEV(dev);
58 static GList *pxb_dev_list;
60 #define TYPE_PXB_HOST "pxb-host"
62 static int pxb_bus_num(PCIBus *bus)
64 PXBDev *pxb = convert_to_pxb(bus->parent_dev);
69 static bool pxb_is_root(PCIBus *bus)
71 return true; /* by definition */
74 static uint16_t pxb_bus_numa_node(PCIBus *bus)
76 PXBDev *pxb = convert_to_pxb(bus->parent_dev);
78 return pxb->numa_node;
81 static void pxb_bus_class_init(ObjectClass *class, void *data)
83 PCIBusClass *pbc = PCI_BUS_CLASS(class);
85 pbc->bus_num = pxb_bus_num;
86 pbc->is_root = pxb_is_root;
87 pbc->numa_node = pxb_bus_numa_node;
90 static const TypeInfo pxb_bus_info = {
92 .parent = TYPE_PCI_BUS,
93 .instance_size = sizeof(PXBBus),
94 .class_init = pxb_bus_class_init,
97 static const TypeInfo pxb_pcie_bus_info = {
98 .name = TYPE_PXB_PCIE_BUS,
99 .parent = TYPE_PCIE_BUS,
100 .instance_size = sizeof(PXBBus),
101 .class_init = pxb_bus_class_init,
104 static const char *pxb_host_root_bus_path(PCIHostState *host_bridge,
107 PXBBus *bus = pci_bus_is_express(rootbus) ?
108 PXB_PCIE_BUS(rootbus) : PXB_BUS(rootbus);
110 snprintf(bus->bus_path, 8, "0000:%02x", pxb_bus_num(rootbus));
111 return bus->bus_path;
114 static char *pxb_host_ofw_unit_address(const SysBusDevice *dev)
116 const PCIHostState *pxb_host;
117 const PCIBus *pxb_bus;
118 const PXBDev *pxb_dev;
120 const DeviceState *pxb_dev_base;
121 const PCIHostState *main_host;
122 const SysBusDevice *main_host_sbd;
124 pxb_host = PCI_HOST_BRIDGE(dev);
125 pxb_bus = pxb_host->bus;
126 pxb_dev = convert_to_pxb(pxb_bus->parent_dev);
127 position = g_list_index(pxb_dev_list, pxb_dev);
128 assert(position >= 0);
130 pxb_dev_base = DEVICE(pxb_dev);
131 main_host = PCI_HOST_BRIDGE(pxb_dev_base->parent_bus->parent);
132 main_host_sbd = SYS_BUS_DEVICE(main_host);
134 if (main_host_sbd->num_mmio > 0) {
135 return g_strdup_printf(TARGET_FMT_plx ",%x",
136 main_host_sbd->mmio[0].addr, position + 1);
138 if (main_host_sbd->num_pio > 0) {
139 return g_strdup_printf("i%04x,%x",
140 main_host_sbd->pio[0], position + 1);
145 static void pxb_host_class_init(ObjectClass *class, void *data)
147 DeviceClass *dc = DEVICE_CLASS(class);
148 SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(class);
149 PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(class);
152 /* Reason: Internal part of the pxb/pxb-pcie device, not usable by itself */
153 dc->user_creatable = false;
154 sbc->explicit_ofw_unit_address = pxb_host_ofw_unit_address;
155 hc->root_bus_path = pxb_host_root_bus_path;
158 static const TypeInfo pxb_host_info = {
159 .name = TYPE_PXB_HOST,
160 .parent = TYPE_PCI_HOST_BRIDGE,
161 .class_init = pxb_host_class_init,
165 * Registers the PXB bus as a child of pci host root bus.
167 static void pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus, Error **errp)
169 PCIBus *bus = pci_get_bus(dev);
170 int pxb_bus_num = pci_bus_num(pxb_bus);
172 if (bus->parent_dev) {
173 error_setg(errp, "PXB devices can be attached only to root bus");
177 QLIST_FOREACH(bus, &bus->child, sibling) {
178 if (pci_bus_num(bus) == pxb_bus_num) {
179 error_setg(errp, "Bus %d is already in use", pxb_bus_num);
183 QLIST_INSERT_HEAD(&pci_get_bus(dev)->child, pxb_bus, sibling);
186 static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin)
188 PCIDevice *pxb = pci_get_bus(pci_dev)->parent_dev;
191 * The bios does not index the pxb slot number when
192 * it computes the IRQ because it resides on bus 0
193 * and not on the current bus.
194 * However QEMU routes the irq through bus 0 and adds
195 * the pxb slot to the IRQ computation of the PXB
198 * Synchronize between bios and QEMU by canceling
201 return pin - PCI_SLOT(pxb->devfn);
204 static gint pxb_compare(gconstpointer a, gconstpointer b)
206 const PXBDev *pxb_a = a, *pxb_b = b;
208 return pxb_a->bus_nr < pxb_b->bus_nr ? -1 :
209 pxb_a->bus_nr > pxb_b->bus_nr ? 1 :
213 static void pxb_dev_realize_common(PCIDevice *dev, bool pcie, Error **errp)
215 PXBDev *pxb = convert_to_pxb(dev);
216 DeviceState *ds, *bds = NULL;
218 const char *dev_name = NULL;
219 Error *local_err = NULL;
221 if (pxb->numa_node != NUMA_NODE_UNASSIGNED &&
222 pxb->numa_node >= nb_numa_nodes) {
223 error_setg(errp, "Illegal numa node %d", pxb->numa_node);
227 if (dev->qdev.id && *dev->qdev.id) {
228 dev_name = dev->qdev.id;
231 ds = qdev_create(NULL, TYPE_PXB_HOST);
233 bus = pci_root_bus_new(ds, dev_name, NULL, NULL, 0, TYPE_PXB_PCIE_BUS);
235 bus = pci_root_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS);
236 bds = qdev_create(BUS(bus), "pci-bridge");
238 qdev_prop_set_uint8(bds, PCI_BRIDGE_DEV_PROP_CHASSIS_NR, pxb->bus_nr);
239 qdev_prop_set_bit(bds, PCI_BRIDGE_DEV_PROP_SHPC, false);
242 bus->parent_dev = dev;
243 bus->address_space_mem = pci_get_bus(dev)->address_space_mem;
244 bus->address_space_io = pci_get_bus(dev)->address_space_io;
245 bus->map_irq = pxb_map_irq_fn;
247 PCI_HOST_BRIDGE(ds)->bus = bus;
249 pxb_register_bus(dev, bus, &local_err);
251 error_propagate(errp, local_err);
252 goto err_register_bus;
255 qdev_init_nofail(ds);
257 qdev_init_nofail(bds);
260 pci_word_test_and_set_mask(dev->config + PCI_STATUS,
261 PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);
262 pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_HOST);
264 pxb_dev_list = g_list_insert_sorted(pxb_dev_list, pxb, pxb_compare);
268 object_unref(OBJECT(bds));
269 object_unparent(OBJECT(bus));
270 object_unref(OBJECT(ds));
273 static void pxb_dev_realize(PCIDevice *dev, Error **errp)
275 if (pci_bus_is_express(pci_get_bus(dev))) {
276 error_setg(errp, "pxb devices cannot reside on a PCIe bus");
280 pxb_dev_realize_common(dev, false, errp);
283 static void pxb_dev_exitfn(PCIDevice *pci_dev)
285 PXBDev *pxb = convert_to_pxb(pci_dev);
287 pxb_dev_list = g_list_remove(pxb_dev_list, pxb);
290 static Property pxb_dev_properties[] = {
291 /* Note: 0 is not a legal PXB bus number. */
292 DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0),
293 DEFINE_PROP_UINT16("numa_node", PXBDev, numa_node, NUMA_NODE_UNASSIGNED),
294 DEFINE_PROP_END_OF_LIST(),
297 static void pxb_dev_class_init(ObjectClass *klass, void *data)
299 DeviceClass *dc = DEVICE_CLASS(klass);
300 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
302 k->realize = pxb_dev_realize;
303 k->exit = pxb_dev_exitfn;
304 k->vendor_id = PCI_VENDOR_ID_REDHAT;
305 k->device_id = PCI_DEVICE_ID_REDHAT_PXB;
306 k->class_id = PCI_CLASS_BRIDGE_HOST;
308 dc->desc = "PCI Expander Bridge";
309 dc->props = pxb_dev_properties;
310 dc->hotpluggable = false;
311 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
314 static const TypeInfo pxb_dev_info = {
315 .name = TYPE_PXB_DEVICE,
316 .parent = TYPE_PCI_DEVICE,
317 .instance_size = sizeof(PXBDev),
318 .class_init = pxb_dev_class_init,
319 .interfaces = (InterfaceInfo[]) {
320 { INTERFACE_CONVENTIONAL_PCI_DEVICE },
325 static void pxb_pcie_dev_realize(PCIDevice *dev, Error **errp)
327 if (!pci_bus_is_express(pci_get_bus(dev))) {
328 error_setg(errp, "pxb-pcie devices cannot reside on a PCI bus");
332 pxb_dev_realize_common(dev, true, errp);
335 static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data)
337 DeviceClass *dc = DEVICE_CLASS(klass);
338 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
340 k->realize = pxb_pcie_dev_realize;
341 k->exit = pxb_dev_exitfn;
342 k->vendor_id = PCI_VENDOR_ID_REDHAT;
343 k->device_id = PCI_DEVICE_ID_REDHAT_PXB_PCIE;
344 k->class_id = PCI_CLASS_BRIDGE_HOST;
346 dc->desc = "PCI Express Expander Bridge";
347 dc->props = pxb_dev_properties;
348 dc->hotpluggable = false;
349 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
352 static const TypeInfo pxb_pcie_dev_info = {
353 .name = TYPE_PXB_PCIE_DEVICE,
354 .parent = TYPE_PCI_DEVICE,
355 .instance_size = sizeof(PXBDev),
356 .class_init = pxb_pcie_dev_class_init,
357 .interfaces = (InterfaceInfo[]) {
358 { INTERFACE_CONVENTIONAL_PCI_DEVICE },
363 static void pxb_register_types(void)
365 type_register_static(&pxb_bus_info);
366 type_register_static(&pxb_pcie_bus_info);
367 type_register_static(&pxb_host_info);
368 type_register_static(&pxb_dev_info);
369 type_register_static(&pxb_pcie_dev_info);
372 type_init(pxb_register_types)