aboutsummaryrefslogtreecommitdiff
path: root/hw/pci-bridge/pci_expander_bridge.c
blob: aecf3d7ddf49ffca9e47d46270bd8271a497186e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
/*
 * PCI Expander Bridge Device Emulation
 *
 * Copyright (C) 2015 Red Hat Inc
 *
 * Authors:
 *   Marcel Apfelbaum <marcel@redhat.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 */

#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/pci/pci.h"
#include "hw/pci/pci_bus.h"
#include "hw/pci/pci_host.h"
#include "hw/pci/pci_bridge.h"
#include "qemu/range.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "sysemu/numa.h"

#define TYPE_PXB_BUS "pxb-bus"
#define PXB_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_BUS)

#define TYPE_PXB_PCIE_BUS "pxb-pcie-bus"
#define PXB_PCIE_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_PCIE_BUS)

typedef struct PXBBus {
    /*< private >*/
    PCIBus parent_obj;
    /*< public >*/

    char bus_path[8];
} PXBBus;

#define TYPE_PXB_DEVICE "pxb"
#define PXB_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_DEVICE)

#define TYPE_PXB_PCIE_DEVICE "pxb-pcie"
#define PXB_PCIE_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_PCIE_DEVICE)

typedef struct PXBDev {
    /*< private >*/
    PCIDevice parent_obj;
    /*< public >*/

    uint8_t bus_nr;
    uint16_t numa_node;
} PXBDev;

static PXBDev *convert_to_pxb(PCIDevice *dev)
{
    return pci_bus_is_express(pci_get_bus(dev))
        ? PXB_PCIE_DEV(dev) : PXB_DEV(dev);
}

static GList *pxb_dev_list;

#define TYPE_PXB_HOST "pxb-host"

static int pxb_bus_num(PCIBus *bus)
{
    PXBDev *pxb = convert_to_pxb(bus->parent_dev);

    return pxb->bus_nr;
}

static uint16_t pxb_bus_numa_node(PCIBus *bus)
{
    PXBDev *pxb = convert_to_pxb(bus->parent_dev);

    return pxb->numa_node;
}

static void pxb_bus_class_init(ObjectClass *class, void *data)
{
    PCIBusClass *pbc = PCI_BUS_CLASS(class);

    pbc->bus_num = pxb_bus_num;
    pbc->numa_node = pxb_bus_numa_node;
}

static const TypeInfo pxb_bus_info = {
    .name          = TYPE_PXB_BUS,
    .parent        = TYPE_PCI_BUS,
    .instance_size = sizeof(PXBBus),
    .class_init    = pxb_bus_class_init,
};

static const TypeInfo pxb_pcie_bus_info = {
    .name          = TYPE_PXB_PCIE_BUS,
    .parent        = TYPE_PCIE_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);

    snprintf(bus->bus_path, 8, "0000:%02x", pxb_bus_num(rootbus));
    return bus->bus_path;
}

static char *pxb_host_ofw_unit_address(const SysBusDevice *dev)
{
    const PCIHostState *pxb_host;
    const PCIBus *pxb_bus;
    const PXBDev *pxb_dev;
    int position;
    const DeviceState *pxb_dev_base;
    const PCIHostState *main_host;
    const SysBusDevice *main_host_sbd;

    pxb_host = PCI_HOST_BRIDGE(dev);
    pxb_bus = pxb_host->bus;
    pxb_dev = convert_to_pxb(pxb_bus->parent_dev);
    position = g_list_index(pxb_dev_list, pxb_dev);
    assert(position >= 0);

    pxb_dev_base = DEVICE(pxb_dev);
    main_host = PCI_HOST_BRIDGE(pxb_dev_base->parent_bus->parent);
    main_host_sbd = SYS_BUS_DEVICE(main_host);

    if (main_host_sbd->num_mmio > 0) {
        return g_strdup_printf(TARGET_FMT_plx ",%x",
                               main_host_sbd->mmio[0].addr, position + 1);
    }
    if (main_host_sbd->num_pio > 0) {
        return g_strdup_printf("i%04x,%x",
                               main_host_sbd->pio[0], position + 1);
    }
    return NULL;
}

static void pxb_host_class_init(ObjectClass *class, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(class);
    SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(class);
    PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(class);

    dc->fw_name = "pci";
    /* Reason: Internal part of the pxb/pxb-pcie device, not usable by itself */
    dc->user_creatable = false;
    sbc->explicit_ofw_unit_address = pxb_host_ofw_unit_address;
    hc->root_bus_path = pxb_host_root_bus_path;
}

static const TypeInfo pxb_host_info = {
    .name          = TYPE_PXB_HOST,
    .parent        = TYPE_PCI_HOST_BRIDGE,
    .class_init    = pxb_host_class_init,
};

/*
 * Registers the PXB bus as a child of pci host root bus.
 */
static void pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus, Error **errp)
{
    PCIBus *bus = pci_get_bus(dev);
    int pxb_bus_num = pci_bus_num(pxb_bus);

    if (bus->parent_dev) {
        error_setg(errp, "PXB devices can be attached only to root bus");
        return;
    }

    QLIST_FOREACH(bus, &bus->child, sibling) {
        if (pci_bus_num(bus) == pxb_bus_num) {
            error_setg(errp, "Bus %d is already in use", pxb_bus_num);
            return;
        }
    }
    QLIST_INSERT_HEAD(&pci_get_bus(dev)->child, pxb_bus, sibling);
}

static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin)
{
    PCIDevice *pxb = pci_get_bus(pci_dev)->parent_dev;

    /*
     * The bios does not index the pxb slot number when
     * it computes the IRQ because it resides on bus 0
     * and not on the current bus.
     * However QEMU routes the irq through bus 0 and adds
     * the pxb slot to the IRQ computation of the PXB
     * device.
     *
     * Synchronize between bios and QEMU by canceling
     * pxb's effect.
     */
    return pin - PCI_SLOT(pxb->devfn);
}

static gint pxb_compare(gconstpointer a, gconstpointer b)
{
    const PXBDev *pxb_a = a, *pxb_b = b;

    return pxb_a->bus_nr < pxb_b->bus_nr ? -1 :
           pxb_a->bus_nr > pxb_b->bus_nr ?  1 :
           0;
}

static void pxb_dev_realize_common(PCIDevice *dev, bool pcie, Error **errp)
{
    PXBDev *pxb = convert_to_pxb(dev);
    DeviceState *ds, *bds = NULL;
    PCIBus *bus;
    const char *dev_name = NULL;
    Error *local_err = NULL;

    if (pxb->numa_node != NUMA_NODE_UNASSIGNED &&
        pxb->numa_node >= nb_numa_nodes) {
        error_setg(errp, "Illegal numa node %d", pxb->numa_node);
        return;
    }

    if (dev->qdev.id && *dev->qdev.id) {
        dev_name = dev->qdev.id;
    }

    ds = qdev_create(NULL, TYPE_PXB_HOST);
    if (pcie) {
        bus = pci_root_bus_new(ds, dev_name, NULL, NULL, 0, TYPE_PXB_PCIE_BUS);
    } else {
        bus = pci_root_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS);
        bds = qdev_create(BUS(bus), "pci-bridge");
        bds->id = dev_name;
        qdev_prop_set_uint8(bds, PCI_BRIDGE_DEV_PROP_CHASSIS_NR, pxb->bus_nr);
        qdev_prop_set_bit(bds, PCI_BRIDGE_DEV_PROP_SHPC, false);
    }

    bus->parent_dev = dev;
    bus->address_space_mem = pci_get_bus(dev)->address_space_mem;
    bus->address_space_io = pci_get_bus(dev)->address_space_io;
    bus->map_irq = pxb_map_irq_fn;

    PCI_HOST_BRIDGE(ds)->bus = bus;

    pxb_register_bus(dev, bus, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        goto err_register_bus;
    }

    qdev_init_nofail(ds);
    if (bds) {
        qdev_init_nofail(bds);
    }

    pci_word_test_and_set_mask(dev->config + PCI_STATUS,
                               PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);
    pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_HOST);

    pxb_dev_list = g_list_insert_sorted(pxb_dev_list, pxb, pxb_compare);
    return;

err_register_bus:
    object_unref(OBJECT(bds));
    object_unparent(OBJECT(bus));
    object_unref(OBJECT(ds));
}

static void pxb_dev_realize(PCIDevice *dev, Error **errp)
{
    if (pci_bus_is_express(pci_get_bus(dev))) {
        error_setg(errp, "pxb devices cannot reside on a PCIe bus");
        return;
    }

    pxb_dev_realize_common(dev, false, errp);
}

static void pxb_dev_exitfn(PCIDevice *pci_dev)
{
    PXBDev *pxb = convert_to_pxb(pci_dev);

    pxb_dev_list = g_list_remove(pxb_dev_list, pxb);
}

static Property pxb_dev_properties[] = {
    /* Note: 0 is not a legal PXB bus number. */
    DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0),
    DEFINE_PROP_UINT16("numa_node", PXBDev, numa_node, NUMA_NODE_UNASSIGNED),
    DEFINE_PROP_END_OF_LIST(),
};

static void pxb_dev_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);

    k->realize = pxb_dev_realize;
    k->exit = pxb_dev_exitfn;
    k->vendor_id = PCI_VENDOR_ID_REDHAT;
    k->device_id = PCI_DEVICE_ID_REDHAT_PXB;
    k->class_id = PCI_CLASS_BRIDGE_HOST;

    dc->desc = "PCI Expander Bridge";
    dc->props = pxb_dev_properties;
    dc->hotpluggable = false;
    set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
}

static const TypeInfo pxb_dev_info = {
    .name          = TYPE_PXB_DEVICE,
    .parent        = TYPE_PCI_DEVICE,
    .instance_size = sizeof(PXBDev),
    .class_init    = pxb_dev_class_init,
    .interfaces = (InterfaceInfo[]) {
        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
        { },
    },
};

static void pxb_pcie_dev_realize(PCIDevice *dev, Error **errp)
{
    if (!pci_bus_is_express(pci_get_bus(dev))) {
        error_setg(errp, "pxb-pcie devices cannot reside on a PCI bus");
        return;
    }

    pxb_dev_realize_common(dev, true, errp);
}

static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);

    k->realize = pxb_pcie_dev_realize;
    k->exit = pxb_dev_exitfn;
    k->vendor_id = PCI_VENDOR_ID_REDHAT;
    k->device_id = PCI_DEVICE_ID_REDHAT_PXB_PCIE;
    k->class_id = PCI_CLASS_BRIDGE_HOST;

    dc->desc = "PCI Express Expander Bridge";
    dc->props = pxb_dev_properties;
    dc->hotpluggable = false;
    set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
}

static const TypeInfo pxb_pcie_dev_info = {
    .name          = TYPE_PXB_PCIE_DEVICE,
    .parent        = TYPE_PCI_DEVICE,
    .instance_size = sizeof(PXBDev),
    .class_init    = pxb_pcie_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_host_info);
    type_register_static(&pxb_dev_info);
    type_register_static(&pxb_pcie_dev_info);
}

type_init(pxb_register_types)