block: Avoid error accumulation in bdrv_img_create()
[qemu.git] / hw / pci / pci_host.c
1 /*
2 * pci_host.c
3 *
4 * Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp>
5 * VA Linux Systems Japan K.K.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "qemu/osdep.h"
22 #include "hw/pci/pci.h"
23 #include "hw/pci/pci_bridge.h"
24 #include "hw/pci/pci_host.h"
25 #include "qemu/module.h"
26 #include "hw/pci/pci_bus.h"
27 #include "trace.h"
28
29 /* debug PCI */
30 //#define DEBUG_PCI
31
32 #ifdef DEBUG_PCI
33 #define PCI_DPRINTF(fmt, ...) \
34 do { printf("pci_host_data: " fmt , ## __VA_ARGS__); } while (0)
35 #else
36 #define PCI_DPRINTF(fmt, ...)
37 #endif
38
39 /*
40 * PCI address
41 * bit 16 - 24: bus number
42 * bit 8 - 15: devfun number
43 * bit 0 - 7: offset in configuration space of a given pci device
44 */
45
46 /* the helper function to get a PCIDevice* for a given pci address */
47 static inline PCIDevice *pci_dev_find_by_addr(PCIBus *bus, uint32_t addr)
48 {
49 uint8_t bus_num = addr >> 16;
50 uint8_t devfn = addr >> 8;
51
52 return pci_find_device(bus, bus_num, devfn);
53 }
54
55 static void pci_adjust_config_limit(PCIBus *bus, uint32_t *limit)
56 {
57 if ((*limit > PCI_CONFIG_SPACE_SIZE) &&
58 !pci_bus_allows_extended_config_space(bus)) {
59 *limit = PCI_CONFIG_SPACE_SIZE;
60 }
61 }
62
63 void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr,
64 uint32_t limit, uint32_t val, uint32_t len)
65 {
66 pci_adjust_config_limit(pci_get_bus(pci_dev), &limit);
67 if (limit <= addr) {
68 return;
69 }
70
71 assert(len <= 4);
72 /* non-zero functions are only exposed when function 0 is present,
73 * allowing direct removal of unexposed functions.
74 */
75 if (pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) {
76 return;
77 }
78
79 trace_pci_cfg_write(pci_dev->name, PCI_SLOT(pci_dev->devfn),
80 PCI_FUNC(pci_dev->devfn), addr, val);
81 pci_dev->config_write(pci_dev, addr, val, MIN(len, limit - addr));
82 }
83
84 uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr,
85 uint32_t limit, uint32_t len)
86 {
87 uint32_t ret;
88
89 pci_adjust_config_limit(pci_get_bus(pci_dev), &limit);
90 if (limit <= addr) {
91 return ~0x0;
92 }
93
94 assert(len <= 4);
95 /* non-zero functions are only exposed when function 0 is present,
96 * allowing direct removal of unexposed functions.
97 */
98 if (pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) {
99 return ~0x0;
100 }
101
102 ret = pci_dev->config_read(pci_dev, addr, MIN(len, limit - addr));
103 trace_pci_cfg_read(pci_dev->name, PCI_SLOT(pci_dev->devfn),
104 PCI_FUNC(pci_dev->devfn), addr, ret);
105
106 return ret;
107 }
108
109 void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, unsigned len)
110 {
111 PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
112 uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
113
114 if (!pci_dev) {
115 return;
116 }
117
118 pci_host_config_write_common(pci_dev, config_addr, PCI_CONFIG_SPACE_SIZE,
119 val, len);
120 }
121
122 uint32_t pci_data_read(PCIBus *s, uint32_t addr, unsigned len)
123 {
124 PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
125 uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
126
127 if (!pci_dev) {
128 return ~0x0;
129 }
130
131 return pci_host_config_read_common(pci_dev, config_addr,
132 PCI_CONFIG_SPACE_SIZE, len);
133 }
134
135 static void pci_host_config_write(void *opaque, hwaddr addr,
136 uint64_t val, unsigned len)
137 {
138 PCIHostState *s = opaque;
139
140 PCI_DPRINTF("%s addr " TARGET_FMT_plx " len %d val %"PRIx64"\n",
141 __func__, addr, len, val);
142 if (addr != 0 || len != 4) {
143 return;
144 }
145 s->config_reg = val;
146 }
147
148 static uint64_t pci_host_config_read(void *opaque, hwaddr addr,
149 unsigned len)
150 {
151 PCIHostState *s = opaque;
152 uint32_t val = s->config_reg;
153
154 PCI_DPRINTF("%s addr " TARGET_FMT_plx " len %d val %"PRIx32"\n",
155 __func__, addr, len, val);
156 return val;
157 }
158
159 static void pci_host_data_write(void *opaque, hwaddr addr,
160 uint64_t val, unsigned len)
161 {
162 PCIHostState *s = opaque;
163
164 if (s->config_reg & (1u << 31))
165 pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
166 }
167
168 static uint64_t pci_host_data_read(void *opaque,
169 hwaddr addr, unsigned len)
170 {
171 PCIHostState *s = opaque;
172
173 if (!(s->config_reg & (1U << 31))) {
174 return 0xffffffff;
175 }
176 return pci_data_read(s->bus, s->config_reg | (addr & 3), len);
177 }
178
179 const MemoryRegionOps pci_host_conf_le_ops = {
180 .read = pci_host_config_read,
181 .write = pci_host_config_write,
182 .endianness = DEVICE_LITTLE_ENDIAN,
183 };
184
185 const MemoryRegionOps pci_host_conf_be_ops = {
186 .read = pci_host_config_read,
187 .write = pci_host_config_write,
188 .endianness = DEVICE_BIG_ENDIAN,
189 };
190
191 const MemoryRegionOps pci_host_data_le_ops = {
192 .read = pci_host_data_read,
193 .write = pci_host_data_write,
194 .endianness = DEVICE_LITTLE_ENDIAN,
195 };
196
197 const MemoryRegionOps pci_host_data_be_ops = {
198 .read = pci_host_data_read,
199 .write = pci_host_data_write,
200 .endianness = DEVICE_BIG_ENDIAN,
201 };
202
203 static const TypeInfo pci_host_type_info = {
204 .name = TYPE_PCI_HOST_BRIDGE,
205 .parent = TYPE_SYS_BUS_DEVICE,
206 .abstract = true,
207 .class_size = sizeof(PCIHostBridgeClass),
208 .instance_size = sizeof(PCIHostState),
209 };
210
211 static void pci_host_register_types(void)
212 {
213 type_register_static(&pci_host_type_info);
214 }
215
216 type_init(pci_host_register_types)