1 | /* |
2 | * PCI Expander Bridge Device Emulation |
3 | * |
4 | * Copyright (C) 2015 Red Hat Inc |
5 | * |
6 | * Authors: |
7 | * Marcel Apfelbaum <marcel@redhat.com> |
8 | * |
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. |
11 | */ |
12 | |
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/qdev-properties.h" |
19 | #include "hw/pci/pci_bridge.h" |
20 | #include "qemu/range.h" |
21 | #include "qemu/error-report.h" |
22 | #include "qemu/module.h" |
23 | #include "sysemu/numa.h" |
24 | #include "hw/boards.h" |
25 | |
26 | #define TYPE_PXB_BUS "pxb-bus" |
27 | #define PXB_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_BUS) |
28 | |
29 | #define TYPE_PXB_PCIE_BUS "pxb-pcie-bus" |
30 | #define PXB_PCIE_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_PCIE_BUS) |
31 | |
32 | typedef struct PXBBus { |
33 | /*< private >*/ |
34 | PCIBus parent_obj; |
35 | /*< public >*/ |
36 | |
37 | char bus_path[8]; |
38 | } PXBBus; |
39 | |
40 | #define TYPE_PXB_DEVICE "pxb" |
41 | #define PXB_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_DEVICE) |
42 | |
43 | #define TYPE_PXB_PCIE_DEVICE "pxb-pcie" |
44 | #define PXB_PCIE_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_PCIE_DEVICE) |
45 | |
46 | typedef struct PXBDev { |
47 | /*< private >*/ |
48 | PCIDevice parent_obj; |
49 | /*< public >*/ |
50 | |
51 | uint8_t bus_nr; |
52 | uint16_t numa_node; |
53 | } PXBDev; |
54 | |
55 | static PXBDev *convert_to_pxb(PCIDevice *dev) |
56 | { |
57 | return pci_bus_is_express(pci_get_bus(dev)) |
58 | ? PXB_PCIE_DEV(dev) : PXB_DEV(dev); |
59 | } |
60 | |
61 | static GList *pxb_dev_list; |
62 | |
63 | #define TYPE_PXB_HOST "pxb-host" |
64 | |
65 | static int pxb_bus_num(PCIBus *bus) |
66 | { |
67 | PXBDev *pxb = convert_to_pxb(bus->parent_dev); |
68 | |
69 | return pxb->bus_nr; |
70 | } |
71 | |
72 | static uint16_t pxb_bus_numa_node(PCIBus *bus) |
73 | { |
74 | PXBDev *pxb = convert_to_pxb(bus->parent_dev); |
75 | |
76 | return pxb->numa_node; |
77 | } |
78 | |
79 | static void pxb_bus_class_init(ObjectClass *class, void *data) |
80 | { |
81 | PCIBusClass *pbc = PCI_BUS_CLASS(class); |
82 | |
83 | pbc->bus_num = pxb_bus_num; |
84 | pbc->numa_node = pxb_bus_numa_node; |
85 | } |
86 | |
87 | static const TypeInfo pxb_bus_info = { |
88 | .name = TYPE_PXB_BUS, |
89 | .parent = TYPE_PCI_BUS, |
90 | .instance_size = sizeof(PXBBus), |
91 | .class_init = pxb_bus_class_init, |
92 | }; |
93 | |
94 | static const TypeInfo pxb_pcie_bus_info = { |
95 | .name = TYPE_PXB_PCIE_BUS, |
96 | .parent = TYPE_PCIE_BUS, |
97 | .instance_size = sizeof(PXBBus), |
98 | .class_init = pxb_bus_class_init, |
99 | }; |
100 | |
101 | static const char *pxb_host_root_bus_path(PCIHostState *host_bridge, |
102 | PCIBus *rootbus) |
103 | { |
104 | PXBBus *bus = pci_bus_is_express(rootbus) ? |
105 | PXB_PCIE_BUS(rootbus) : PXB_BUS(rootbus); |
106 | |
107 | snprintf(bus->bus_path, 8, "0000:%02x" , pxb_bus_num(rootbus)); |
108 | return bus->bus_path; |
109 | } |
110 | |
111 | static char *pxb_host_ofw_unit_address(const SysBusDevice *dev) |
112 | { |
113 | const PCIHostState *pxb_host; |
114 | const PCIBus *pxb_bus; |
115 | const PXBDev *pxb_dev; |
116 | int position; |
117 | const DeviceState *pxb_dev_base; |
118 | const PCIHostState *main_host; |
119 | const SysBusDevice *main_host_sbd; |
120 | |
121 | pxb_host = PCI_HOST_BRIDGE(dev); |
122 | pxb_bus = pxb_host->bus; |
123 | pxb_dev = convert_to_pxb(pxb_bus->parent_dev); |
124 | position = g_list_index(pxb_dev_list, pxb_dev); |
125 | assert(position >= 0); |
126 | |
127 | pxb_dev_base = DEVICE(pxb_dev); |
128 | main_host = PCI_HOST_BRIDGE(pxb_dev_base->parent_bus->parent); |
129 | main_host_sbd = SYS_BUS_DEVICE(main_host); |
130 | |
131 | if (main_host_sbd->num_mmio > 0) { |
132 | return g_strdup_printf(TARGET_FMT_plx ",%x" , |
133 | main_host_sbd->mmio[0].addr, position + 1); |
134 | } |
135 | if (main_host_sbd->num_pio > 0) { |
136 | return g_strdup_printf("i%04x,%x" , |
137 | main_host_sbd->pio[0], position + 1); |
138 | } |
139 | return NULL; |
140 | } |
141 | |
142 | static void pxb_host_class_init(ObjectClass *class, void *data) |
143 | { |
144 | DeviceClass *dc = DEVICE_CLASS(class); |
145 | SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(class); |
146 | PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(class); |
147 | |
148 | dc->fw_name = "pci" ; |
149 | /* Reason: Internal part of the pxb/pxb-pcie device, not usable by itself */ |
150 | dc->user_creatable = false; |
151 | sbc->explicit_ofw_unit_address = pxb_host_ofw_unit_address; |
152 | hc->root_bus_path = pxb_host_root_bus_path; |
153 | } |
154 | |
155 | static const TypeInfo pxb_host_info = { |
156 | .name = TYPE_PXB_HOST, |
157 | .parent = TYPE_PCI_HOST_BRIDGE, |
158 | .class_init = pxb_host_class_init, |
159 | }; |
160 | |
161 | /* |
162 | * Registers the PXB bus as a child of pci host root bus. |
163 | */ |
164 | static void pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus, Error **errp) |
165 | { |
166 | PCIBus *bus = pci_get_bus(dev); |
167 | int pxb_bus_num = pci_bus_num(pxb_bus); |
168 | |
169 | if (bus->parent_dev) { |
170 | error_setg(errp, "PXB devices can be attached only to root bus" ); |
171 | return; |
172 | } |
173 | |
174 | QLIST_FOREACH(bus, &bus->child, sibling) { |
175 | if (pci_bus_num(bus) == pxb_bus_num) { |
176 | error_setg(errp, "Bus %d is already in use" , pxb_bus_num); |
177 | return; |
178 | } |
179 | } |
180 | QLIST_INSERT_HEAD(&pci_get_bus(dev)->child, pxb_bus, sibling); |
181 | } |
182 | |
183 | static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin) |
184 | { |
185 | PCIDevice *pxb = pci_get_bus(pci_dev)->parent_dev; |
186 | |
187 | /* |
188 | * The bios does not index the pxb slot number when |
189 | * it computes the IRQ because it resides on bus 0 |
190 | * and not on the current bus. |
191 | * However QEMU routes the irq through bus 0 and adds |
192 | * the pxb slot to the IRQ computation of the PXB |
193 | * device. |
194 | * |
195 | * Synchronize between bios and QEMU by canceling |
196 | * pxb's effect. |
197 | */ |
198 | return pin - PCI_SLOT(pxb->devfn); |
199 | } |
200 | |
201 | static gint pxb_compare(gconstpointer a, gconstpointer b) |
202 | { |
203 | const PXBDev *pxb_a = a, *pxb_b = b; |
204 | |
205 | return pxb_a->bus_nr < pxb_b->bus_nr ? -1 : |
206 | pxb_a->bus_nr > pxb_b->bus_nr ? 1 : |
207 | 0; |
208 | } |
209 | |
210 | static void pxb_dev_realize_common(PCIDevice *dev, bool pcie, Error **errp) |
211 | { |
212 | PXBDev *pxb = convert_to_pxb(dev); |
213 | DeviceState *ds, *bds = NULL; |
214 | PCIBus *bus; |
215 | const char *dev_name = NULL; |
216 | Error *local_err = NULL; |
217 | MachineState *ms = MACHINE(qdev_get_machine()); |
218 | |
219 | if (ms->numa_state == NULL) { |
220 | error_setg(errp, "NUMA is not supported by this machine-type" ); |
221 | return; |
222 | } |
223 | |
224 | if (pxb->numa_node != NUMA_NODE_UNASSIGNED && |
225 | pxb->numa_node >= ms->numa_state->num_nodes) { |
226 | error_setg(errp, "Illegal numa node %d" , pxb->numa_node); |
227 | return; |
228 | } |
229 | |
230 | if (dev->qdev.id && *dev->qdev.id) { |
231 | dev_name = dev->qdev.id; |
232 | } |
233 | |
234 | ds = qdev_create(NULL, TYPE_PXB_HOST); |
235 | if (pcie) { |
236 | bus = pci_root_bus_new(ds, dev_name, NULL, NULL, 0, TYPE_PXB_PCIE_BUS); |
237 | } else { |
238 | bus = pci_root_bus_new(ds, "pxb-internal" , NULL, NULL, 0, TYPE_PXB_BUS); |
239 | bds = qdev_create(BUS(bus), "pci-bridge" ); |
240 | bds->id = dev_name; |
241 | qdev_prop_set_uint8(bds, PCI_BRIDGE_DEV_PROP_CHASSIS_NR, pxb->bus_nr); |
242 | qdev_prop_set_bit(bds, PCI_BRIDGE_DEV_PROP_SHPC, false); |
243 | } |
244 | |
245 | bus->parent_dev = dev; |
246 | bus->address_space_mem = pci_get_bus(dev)->address_space_mem; |
247 | bus->address_space_io = pci_get_bus(dev)->address_space_io; |
248 | bus->map_irq = pxb_map_irq_fn; |
249 | |
250 | PCI_HOST_BRIDGE(ds)->bus = bus; |
251 | |
252 | pxb_register_bus(dev, bus, &local_err); |
253 | if (local_err) { |
254 | error_propagate(errp, local_err); |
255 | goto err_register_bus; |
256 | } |
257 | |
258 | qdev_init_nofail(ds); |
259 | if (bds) { |
260 | qdev_init_nofail(bds); |
261 | } |
262 | |
263 | pci_word_test_and_set_mask(dev->config + PCI_STATUS, |
264 | PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK); |
265 | pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_HOST); |
266 | |
267 | pxb_dev_list = g_list_insert_sorted(pxb_dev_list, pxb, pxb_compare); |
268 | return; |
269 | |
270 | err_register_bus: |
271 | object_unref(OBJECT(bds)); |
272 | object_unparent(OBJECT(bus)); |
273 | object_unref(OBJECT(ds)); |
274 | } |
275 | |
276 | static void pxb_dev_realize(PCIDevice *dev, Error **errp) |
277 | { |
278 | if (pci_bus_is_express(pci_get_bus(dev))) { |
279 | error_setg(errp, "pxb devices cannot reside on a PCIe bus" ); |
280 | return; |
281 | } |
282 | |
283 | pxb_dev_realize_common(dev, false, errp); |
284 | } |
285 | |
286 | static void pxb_dev_exitfn(PCIDevice *pci_dev) |
287 | { |
288 | PXBDev *pxb = convert_to_pxb(pci_dev); |
289 | |
290 | pxb_dev_list = g_list_remove(pxb_dev_list, pxb); |
291 | } |
292 | |
293 | static Property pxb_dev_properties[] = { |
294 | /* Note: 0 is not a legal PXB bus number. */ |
295 | DEFINE_PROP_UINT8("bus_nr" , PXBDev, bus_nr, 0), |
296 | DEFINE_PROP_UINT16("numa_node" , PXBDev, numa_node, NUMA_NODE_UNASSIGNED), |
297 | DEFINE_PROP_END_OF_LIST(), |
298 | }; |
299 | |
300 | static void pxb_dev_class_init(ObjectClass *klass, void *data) |
301 | { |
302 | DeviceClass *dc = DEVICE_CLASS(klass); |
303 | PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); |
304 | |
305 | k->realize = pxb_dev_realize; |
306 | k->exit = pxb_dev_exitfn; |
307 | k->vendor_id = PCI_VENDOR_ID_REDHAT; |
308 | k->device_id = PCI_DEVICE_ID_REDHAT_PXB; |
309 | k->class_id = PCI_CLASS_BRIDGE_HOST; |
310 | |
311 | dc->desc = "PCI Expander Bridge" ; |
312 | dc->props = pxb_dev_properties; |
313 | dc->hotpluggable = false; |
314 | set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); |
315 | } |
316 | |
317 | static const TypeInfo pxb_dev_info = { |
318 | .name = TYPE_PXB_DEVICE, |
319 | .parent = TYPE_PCI_DEVICE, |
320 | .instance_size = sizeof(PXBDev), |
321 | .class_init = pxb_dev_class_init, |
322 | .interfaces = (InterfaceInfo[]) { |
323 | { INTERFACE_CONVENTIONAL_PCI_DEVICE }, |
324 | { }, |
325 | }, |
326 | }; |
327 | |
328 | static void pxb_pcie_dev_realize(PCIDevice *dev, Error **errp) |
329 | { |
330 | if (!pci_bus_is_express(pci_get_bus(dev))) { |
331 | error_setg(errp, "pxb-pcie devices cannot reside on a PCI bus" ); |
332 | return; |
333 | } |
334 | |
335 | pxb_dev_realize_common(dev, true, errp); |
336 | } |
337 | |
338 | static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data) |
339 | { |
340 | DeviceClass *dc = DEVICE_CLASS(klass); |
341 | PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); |
342 | |
343 | k->realize = pxb_pcie_dev_realize; |
344 | k->exit = pxb_dev_exitfn; |
345 | k->vendor_id = PCI_VENDOR_ID_REDHAT; |
346 | k->device_id = PCI_DEVICE_ID_REDHAT_PXB_PCIE; |
347 | k->class_id = PCI_CLASS_BRIDGE_HOST; |
348 | |
349 | dc->desc = "PCI Express Expander Bridge" ; |
350 | dc->props = pxb_dev_properties; |
351 | dc->hotpluggable = false; |
352 | set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); |
353 | } |
354 | |
355 | static const TypeInfo pxb_pcie_dev_info = { |
356 | .name = TYPE_PXB_PCIE_DEVICE, |
357 | .parent = TYPE_PCI_DEVICE, |
358 | .instance_size = sizeof(PXBDev), |
359 | .class_init = pxb_pcie_dev_class_init, |
360 | .interfaces = (InterfaceInfo[]) { |
361 | { INTERFACE_CONVENTIONAL_PCI_DEVICE }, |
362 | { }, |
363 | }, |
364 | }; |
365 | |
366 | static void pxb_register_types(void) |
367 | { |
368 | type_register_static(&pxb_bus_info); |
369 | type_register_static(&pxb_pcie_bus_info); |
370 | type_register_static(&pxb_host_info); |
371 | type_register_static(&pxb_dev_info); |
372 | type_register_static(&pxb_pcie_dev_info); |
373 | } |
374 | |
375 | type_init(pxb_register_types) |
376 | |