1 /*
2  * Generic PCI Express Root Port emulation
3  *
4  * Copyright (C) 2017 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 "qemu/module.h"
16 #include "hw/pci/msix.h"
17 #include "hw/pci/pcie_port.h"
18 #include "hw/qdev-properties.h"
19 #include "hw/qdev-properties-system.h"
20 #include "migration/vmstate.h"
21 #include "qom/object.h"
22 
23 #define TYPE_GEN_PCIE_ROOT_PORT                "pcie-root-port"
24 OBJECT_DECLARE_SIMPLE_TYPE(GenPCIERootPort, GEN_PCIE_ROOT_PORT)
25 
26 #define GEN_PCIE_ROOT_PORT_AER_OFFSET           0x100
27 #define GEN_PCIE_ROOT_PORT_ACS_OFFSET \
28         (GEN_PCIE_ROOT_PORT_AER_OFFSET + PCI_ERR_SIZEOF)
29 
30 #define GEN_PCIE_ROOT_PORT_MSIX_NR_VECTOR       1
31 #define GEN_PCIE_ROOT_DEFAULT_IO_RANGE          4096
32 
33 struct GenPCIERootPort {
34     /*< private >*/
35     PCIESlot parent_obj;
36     /*< public >*/
37 
38     bool migrate_msix;
39 
40     /* additional resources to reserve */
41     PCIResReserve res_reserve;
42 };
43 
44 static uint8_t gen_rp_aer_vector(const PCIDevice *d)
45 {
46     return 0;
47 }
48 
49 static int gen_rp_interrupts_init(PCIDevice *d, Error **errp)
50 {
51     int rc;
52 
53     rc = msix_init_exclusive_bar(d, GEN_PCIE_ROOT_PORT_MSIX_NR_VECTOR, 0, errp);
54 
55     if (rc < 0) {
56         assert(rc == -ENOTSUP);
57     } else {
58         msix_vector_use(d, 0);
59     }
60 
61     return rc;
62 }
63 
64 static void gen_rp_interrupts_uninit(PCIDevice *d)
65 {
66     msix_uninit_exclusive_bar(d);
67 }
68 
69 static bool gen_rp_test_migrate_msix(void *opaque, int version_id)
70 {
71     GenPCIERootPort *rp = opaque;
72 
73     return rp->migrate_msix;
74 }
75 
76 static void gen_rp_realize(DeviceState *dev, Error **errp)
77 {
78     PCIDevice *d = PCI_DEVICE(dev);
79     PCIESlot *s = PCIE_SLOT(d);
80     GenPCIERootPort *grp = GEN_PCIE_ROOT_PORT(d);
81     PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(d);
82     Error *local_err = NULL;
83 
84     rpc->parent_realize(dev, &local_err);
85     if (local_err) {
86         error_propagate(errp, local_err);
87         return;
88     }
89 
90     /*
91      * reserving IO space led to worse issues in 6.1, when this hunk was
92      * introduced. (see commit: 211afe5c69b59). Keep this broken for 6.1
93      * machine type ABI compatibility only
94      */
95     if (s->hide_native_hotplug_cap && grp->res_reserve.io == -1 && s->hotplug) {
96         grp->res_reserve.io = GEN_PCIE_ROOT_DEFAULT_IO_RANGE;
97     }
98     int rc = pci_bridge_qemu_reserve_cap_init(d, 0,
99                                               grp->res_reserve, errp);
100 
101     if (rc < 0) {
102         rpc->parent_class.exit(d);
103         return;
104     }
105 
106     if (!grp->res_reserve.io) {
107         pci_word_test_and_clear_mask(d->wmask + PCI_COMMAND,
108                                      PCI_COMMAND_IO);
109         d->wmask[PCI_IO_BASE] = 0;
110         d->wmask[PCI_IO_LIMIT] = 0;
111     }
112 }
113 
114 static const VMStateDescription vmstate_rp_dev = {
115     .name = "pcie-root-port",
116     .priority = MIG_PRI_PCI_BUS,
117     .version_id = 1,
118     .minimum_version_id = 1,
119     .post_load = pcie_cap_slot_post_load,
120     .fields = (VMStateField[]) {
121         VMSTATE_PCI_DEVICE(parent_obj.parent_obj.parent_obj, PCIESlot),
122         VMSTATE_STRUCT(parent_obj.parent_obj.parent_obj.exp.aer_log,
123                        PCIESlot, 0, vmstate_pcie_aer_log, PCIEAERLog),
124         VMSTATE_MSIX_TEST(parent_obj.parent_obj.parent_obj.parent_obj,
125                           GenPCIERootPort,
126                           gen_rp_test_migrate_msix),
127         VMSTATE_END_OF_LIST()
128     }
129 };
130 
131 static Property gen_rp_props[] = {
132     DEFINE_PROP_BOOL("x-migrate-msix", GenPCIERootPort,
133                      migrate_msix, true),
134     DEFINE_PROP_UINT32("bus-reserve", GenPCIERootPort,
135                        res_reserve.bus, -1),
136     DEFINE_PROP_SIZE("io-reserve", GenPCIERootPort,
137                      res_reserve.io, -1),
138     DEFINE_PROP_SIZE("mem-reserve", GenPCIERootPort,
139                      res_reserve.mem_non_pref, -1),
140     DEFINE_PROP_SIZE("pref32-reserve", GenPCIERootPort,
141                      res_reserve.mem_pref_32, -1),
142     DEFINE_PROP_SIZE("pref64-reserve", GenPCIERootPort,
143                      res_reserve.mem_pref_64, -1),
144     DEFINE_PROP_PCIE_LINK_SPEED("x-speed", PCIESlot,
145                                 speed, PCIE_LINK_SPEED_16),
146     DEFINE_PROP_PCIE_LINK_WIDTH("x-width", PCIESlot,
147                                 width, PCIE_LINK_WIDTH_32),
148     DEFINE_PROP_END_OF_LIST()
149 };
150 
151 static void gen_rp_dev_class_init(ObjectClass *klass, void *data)
152 {
153     DeviceClass *dc = DEVICE_CLASS(klass);
154     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
155     PCIERootPortClass *rpc = PCIE_ROOT_PORT_CLASS(klass);
156 
157     k->vendor_id = PCI_VENDOR_ID_REDHAT;
158     k->device_id = PCI_DEVICE_ID_REDHAT_PCIE_RP;
159     dc->desc = "PCI Express Root Port";
160     dc->vmsd = &vmstate_rp_dev;
161     device_class_set_props(dc, gen_rp_props);
162 
163     device_class_set_parent_realize(dc, gen_rp_realize, &rpc->parent_realize);
164 
165     rpc->aer_vector = gen_rp_aer_vector;
166     rpc->interrupts_init = gen_rp_interrupts_init;
167     rpc->interrupts_uninit = gen_rp_interrupts_uninit;
168     rpc->aer_offset = GEN_PCIE_ROOT_PORT_AER_OFFSET;
169     rpc->acs_offset = GEN_PCIE_ROOT_PORT_ACS_OFFSET;
170 }
171 
172 static const TypeInfo gen_rp_dev_info = {
173     .name          = TYPE_GEN_PCIE_ROOT_PORT,
174     .parent        = TYPE_PCIE_ROOT_PORT,
175     .instance_size = sizeof(GenPCIERootPort),
176     .class_init    = gen_rp_dev_class_init,
177 };
178 
179  static void gen_rp_register_types(void)
180  {
181     type_register_static(&gen_rp_dev_info);
182  }
183  type_init(gen_rp_register_types)
184