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1.1 root 1: /*
2: * QEMU PCI bus manager
3: *
4: * Copyright (c) 2004 Fabrice Bellard
5: *
6: * Permission is hereby granted, free of charge, to any person obtaining a copy
7: * of this software and associated documentation files (the "Software"), to dea
8:
9: * in the Software without restriction, including without limitation the rights
10: * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11: * copies of the Software, and to permit persons to whom the Software is
12: * furnished to do so, subject to the following conditions:
13: *
14: * The above copyright notice and this permission notice shall be included in
15: * all copies or substantial portions of the Software.
16: *
17: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19: * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20: * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM
22:
23: * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24: * THE SOFTWARE.
25: */
26: /*
27: * split out from pci.c
28: * Copyright (c) 2010 Isaku Yamahata <yamahata at valinux co jp>
29: * VA Linux Systems Japan K.K.
30: */
31:
32: #include "pci_bridge.h"
33: #include "pci_internals.h"
34: #include "range.h"
35:
36: /* PCI bridge subsystem vendor ID helper functions */
37: #define PCI_SSVID_SIZEOF 8
38: #define PCI_SSVID_SVID 4
39: #define PCI_SSVID_SSID 6
40:
41: int pci_bridge_ssvid_init(PCIDevice *dev, uint8_t offset,
42: uint16_t svid, uint16_t ssid)
43: {
44: int pos;
45: pos = pci_add_capability(dev, PCI_CAP_ID_SSVID, offset, PCI_SSVID_SIZEOF);
46: if (pos < 0) {
47: return pos;
48: }
49:
50: pci_set_word(dev->config + pos + PCI_SSVID_SVID, svid);
51: pci_set_word(dev->config + pos + PCI_SSVID_SSID, ssid);
52: return pos;
53: }
54:
55: /* Accessor function to get parent bridge device from pci bus. */
56: PCIDevice *pci_bridge_get_device(PCIBus *bus)
57: {
58: return bus->parent_dev;
59: }
60:
61: /* Accessor function to get secondary bus from pci-to-pci bridge device */
62: PCIBus *pci_bridge_get_sec_bus(PCIBridge *br)
63: {
64: return &br->sec_bus;
65: }
66:
67: static uint32_t pci_config_get_io_base(const PCIDevice *d,
68: uint32_t base, uint32_t base_upper16)
69: {
70: uint32_t val;
71:
72: val = ((uint32_t)d->config[base] & PCI_IO_RANGE_MASK) << 8;
73: if (d->config[base] & PCI_IO_RANGE_TYPE_32) {
74: val |= (uint32_t)pci_get_word(d->config + base_upper16) << 16;
75: }
76: return val;
77: }
78:
79: static pcibus_t pci_config_get_memory_base(const PCIDevice *d, uint32_t base)
80: {
81: return ((pcibus_t)pci_get_word(d->config + base) & PCI_MEMORY_RANGE_MASK)
82: << 16;
83: }
84:
85: static pcibus_t pci_config_get_pref_base(const PCIDevice *d,
86: uint32_t base, uint32_t upper)
87: {
88: pcibus_t tmp;
89: pcibus_t val;
90:
91: tmp = (pcibus_t)pci_get_word(d->config + base);
92: val = (tmp & PCI_PREF_RANGE_MASK) << 16;
93: if (tmp & PCI_PREF_RANGE_TYPE_64) {
94: val |= (pcibus_t)pci_get_long(d->config + upper) << 32;
95: }
96: return val;
97: }
98:
99: /* accessor function to get bridge filtering base address */
100: pcibus_t pci_bridge_get_base(const PCIDevice *bridge, uint8_t type)
101: {
102: pcibus_t base;
103: if (type & PCI_BASE_ADDRESS_SPACE_IO) {
104: base = pci_config_get_io_base(bridge,
105: PCI_IO_BASE, PCI_IO_BASE_UPPER16);
106: } else {
107: if (type & PCI_BASE_ADDRESS_MEM_PREFETCH) {
108: base = pci_config_get_pref_base(
109: bridge, PCI_PREF_MEMORY_BASE, PCI_PREF_BASE_UPPER32);
110: } else {
111: base = pci_config_get_memory_base(bridge, PCI_MEMORY_BASE);
112: }
113: }
114:
115: return base;
116: }
117:
118: /* accessor funciton to get bridge filtering limit */
119: pcibus_t pci_bridge_get_limit(const PCIDevice *bridge, uint8_t type)
120: {
121: pcibus_t limit;
122: if (type & PCI_BASE_ADDRESS_SPACE_IO) {
123: limit = pci_config_get_io_base(bridge,
124: PCI_IO_LIMIT, PCI_IO_LIMIT_UPPER16);
125: limit |= 0xfff; /* PCI bridge spec 3.2.5.6. */
126: } else {
127: if (type & PCI_BASE_ADDRESS_MEM_PREFETCH) {
128: limit = pci_config_get_pref_base(
129: bridge, PCI_PREF_MEMORY_LIMIT, PCI_PREF_LIMIT_UPPER32);
130: } else {
131: limit = pci_config_get_memory_base(bridge, PCI_MEMORY_LIMIT);
132: }
133: limit |= 0xfffff; /* PCI bridge spec 3.2.5.{1, 8}. */
134: }
135: return limit;
136: }
137:
1.1.1.2 ! root 138: static void pci_bridge_init_alias(PCIBridge *bridge, MemoryRegion *alias,
! 139: uint8_t type, const char *name,
! 140: MemoryRegion *space,
! 141: MemoryRegion *parent_space,
! 142: bool enabled)
! 143: {
! 144: pcibus_t base = pci_bridge_get_base(&bridge->dev, type);
! 145: pcibus_t limit = pci_bridge_get_limit(&bridge->dev, type);
! 146: /* TODO: this doesn't handle base = 0 limit = 2^64 - 1 correctly.
! 147: * Apparently no way to do this with existing memory APIs. */
! 148: pcibus_t size = enabled && limit >= base ? limit + 1 - base : 0;
! 149:
! 150: memory_region_init_alias(alias, name, space, base, size);
! 151: memory_region_add_subregion_overlap(parent_space, base, alias, 1);
! 152: }
! 153:
! 154: static void pci_bridge_cleanup_alias(MemoryRegion *alias,
! 155: MemoryRegion *parent_space)
! 156: {
! 157: memory_region_del_subregion(parent_space, alias);
! 158: memory_region_destroy(alias);
! 159: }
! 160:
! 161: static void pci_bridge_region_init(PCIBridge *br)
! 162: {
! 163: PCIBus *parent = br->dev.bus;
! 164: uint16_t cmd = pci_get_word(br->dev.config + PCI_COMMAND);
! 165:
! 166: pci_bridge_init_alias(br, &br->alias_pref_mem,
! 167: PCI_BASE_ADDRESS_MEM_PREFETCH,
! 168: "pci_bridge_pref_mem",
! 169: &br->address_space_mem,
! 170: parent->address_space_mem,
! 171: cmd & PCI_COMMAND_MEMORY);
! 172: pci_bridge_init_alias(br, &br->alias_mem,
! 173: PCI_BASE_ADDRESS_SPACE_MEMORY,
! 174: "pci_bridge_mem",
! 175: &br->address_space_mem,
! 176: parent->address_space_mem,
! 177: cmd & PCI_COMMAND_MEMORY);
! 178: pci_bridge_init_alias(br, &br->alias_io,
! 179: PCI_BASE_ADDRESS_SPACE_IO,
! 180: "pci_bridge_io",
! 181: &br->address_space_io,
! 182: parent->address_space_io,
! 183: cmd & PCI_COMMAND_IO);
! 184: /* TODO: optinal VGA and VGA palette snooping support. */
! 185: }
! 186:
! 187: static void pci_bridge_region_cleanup(PCIBridge *br)
! 188: {
! 189: PCIBus *parent = br->dev.bus;
! 190: pci_bridge_cleanup_alias(&br->alias_io,
! 191: parent->address_space_io);
! 192: pci_bridge_cleanup_alias(&br->alias_mem,
! 193: parent->address_space_mem);
! 194: pci_bridge_cleanup_alias(&br->alias_pref_mem,
! 195: parent->address_space_mem);
! 196: }
! 197:
! 198: static void pci_bridge_update_mappings(PCIBridge *br)
! 199: {
! 200: /* Make updates atomic to: handle the case of one VCPU updating the bridge
! 201: * while another accesses an unaffected region. */
! 202: memory_region_transaction_begin();
! 203: pci_bridge_region_cleanup(br);
! 204: pci_bridge_region_init(br);
! 205: memory_region_transaction_commit();
! 206: }
! 207:
1.1 root 208: /* default write_config function for PCI-to-PCI bridge */
209: void pci_bridge_write_config(PCIDevice *d,
210: uint32_t address, uint32_t val, int len)
211: {
212: PCIBridge *s = container_of(d, PCIBridge, dev);
213: uint16_t oldctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL);
214: uint16_t newctl;
215:
216: pci_default_write_config(d, address, val, len);
217:
1.1.1.2 ! root 218: if (ranges_overlap(address, len, PCI_COMMAND, 2) ||
! 219:
! 220: /* io base/limit */
1.1 root 221: ranges_overlap(address, len, PCI_IO_BASE, 2) ||
222:
223: /* memory base/limit, prefetchable base/limit and
224: io base/limit upper 16 */
225: ranges_overlap(address, len, PCI_MEMORY_BASE, 20)) {
1.1.1.2 ! root 226: pci_bridge_update_mappings(s);
1.1 root 227: }
228:
229: newctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL);
230: if (~oldctl & newctl & PCI_BRIDGE_CTL_BUS_RESET) {
231: /* Trigger hot reset on 0->1 transition. */
232: pci_bus_reset(&s->sec_bus);
233: }
234: }
235:
236: void pci_bridge_disable_base_limit(PCIDevice *dev)
237: {
238: uint8_t *conf = dev->config;
239:
240: pci_byte_test_and_set_mask(conf + PCI_IO_BASE,
241: PCI_IO_RANGE_MASK & 0xff);
242: pci_byte_test_and_clear_mask(conf + PCI_IO_LIMIT,
243: PCI_IO_RANGE_MASK & 0xff);
244: pci_word_test_and_set_mask(conf + PCI_MEMORY_BASE,
245: PCI_MEMORY_RANGE_MASK & 0xffff);
246: pci_word_test_and_clear_mask(conf + PCI_MEMORY_LIMIT,
247: PCI_MEMORY_RANGE_MASK & 0xffff);
248: pci_word_test_and_set_mask(conf + PCI_PREF_MEMORY_BASE,
249: PCI_PREF_RANGE_MASK & 0xffff);
250: pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_LIMIT,
251: PCI_PREF_RANGE_MASK & 0xffff);
252: pci_set_word(conf + PCI_PREF_BASE_UPPER32, 0);
253: pci_set_word(conf + PCI_PREF_LIMIT_UPPER32, 0);
254: }
255:
256: /* reset bridge specific configuration registers */
257: void pci_bridge_reset_reg(PCIDevice *dev)
258: {
259: uint8_t *conf = dev->config;
260:
261: conf[PCI_PRIMARY_BUS] = 0;
262: conf[PCI_SECONDARY_BUS] = 0;
263: conf[PCI_SUBORDINATE_BUS] = 0;
264: conf[PCI_SEC_LATENCY_TIMER] = 0;
265:
266: /*
267: * the default values for base/limit registers aren't specified
268: * in the PCI-to-PCI-bridge spec. So we don't thouch them here.
269: * Each implementation can override it.
270: * typical implementation does
271: * zero base/limit registers or
272: * disable forwarding: pci_bridge_disable_base_limit()
273: * If disable forwarding is wanted, call pci_bridge_disable_base_limit()
274: * after this function.
275: */
276: pci_byte_test_and_clear_mask(conf + PCI_IO_BASE,
277: PCI_IO_RANGE_MASK & 0xff);
278: pci_byte_test_and_clear_mask(conf + PCI_IO_LIMIT,
279: PCI_IO_RANGE_MASK & 0xff);
280: pci_word_test_and_clear_mask(conf + PCI_MEMORY_BASE,
281: PCI_MEMORY_RANGE_MASK & 0xffff);
282: pci_word_test_and_clear_mask(conf + PCI_MEMORY_LIMIT,
283: PCI_MEMORY_RANGE_MASK & 0xffff);
284: pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_BASE,
285: PCI_PREF_RANGE_MASK & 0xffff);
286: pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_LIMIT,
287: PCI_PREF_RANGE_MASK & 0xffff);
288: pci_set_word(conf + PCI_PREF_BASE_UPPER32, 0);
289: pci_set_word(conf + PCI_PREF_LIMIT_UPPER32, 0);
290:
291: pci_set_word(conf + PCI_BRIDGE_CONTROL, 0);
292: }
293:
294: /* default reset function for PCI-to-PCI bridge */
295: void pci_bridge_reset(DeviceState *qdev)
296: {
297: PCIDevice *dev = DO_UPCAST(PCIDevice, qdev, qdev);
298: pci_bridge_reset_reg(dev);
299: }
300:
301: /* default qdev initialization function for PCI-to-PCI bridge */
302: int pci_bridge_initfn(PCIDevice *dev)
303: {
304: PCIBus *parent = dev->bus;
305: PCIBridge *br = DO_UPCAST(PCIBridge, dev, dev);
306: PCIBus *sec_bus = &br->sec_bus;
307:
308: pci_set_word(dev->config + PCI_STATUS,
309: PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);
310: pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_PCI);
311: dev->config[PCI_HEADER_TYPE] =
312: (dev->config[PCI_HEADER_TYPE] & PCI_HEADER_TYPE_MULTI_FUNCTION) |
313: PCI_HEADER_TYPE_BRIDGE;
314: pci_set_word(dev->config + PCI_SEC_STATUS,
315: PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);
316:
317: qbus_create_inplace(&sec_bus->qbus, &pci_bus_info, &dev->qdev,
318: br->bus_name);
319: sec_bus->parent_dev = dev;
320: sec_bus->map_irq = br->map_irq;
1.1.1.2 ! root 321: sec_bus->address_space_mem = &br->address_space_mem;
! 322: memory_region_init(&br->address_space_mem, "pci_bridge_pci", INT64_MAX);
! 323: sec_bus->address_space_io = &br->address_space_io;
! 324: memory_region_init(&br->address_space_io, "pci_bridge_io", 65536);
! 325: pci_bridge_region_init(br);
1.1 root 326: QLIST_INIT(&sec_bus->child);
327: QLIST_INSERT_HEAD(&parent->child, sec_bus, sibling);
328: return 0;
329: }
330:
331: /* default qdev clean up function for PCI-to-PCI bridge */
332: int pci_bridge_exitfn(PCIDevice *pci_dev)
333: {
334: PCIBridge *s = DO_UPCAST(PCIBridge, dev, pci_dev);
335: assert(QLIST_EMPTY(&s->sec_bus.child));
336: QLIST_REMOVE(&s->sec_bus, sibling);
1.1.1.2 ! root 337: pci_bridge_region_cleanup(s);
! 338: memory_region_destroy(&s->address_space_mem);
! 339: memory_region_destroy(&s->address_space_io);
1.1 root 340: /* qbus_free() is called automatically by qdev_free() */
341: return 0;
342: }
343:
344: /*
345: * before qdev initialization(qdev_init()), this function sets bus_name and
346: * map_irq callback which are necessry for pci_bridge_initfn() to
347: * initialize bus.
348: */
349: void pci_bridge_map_irq(PCIBridge *br, const char* bus_name,
350: pci_map_irq_fn map_irq)
351: {
352: br->map_irq = map_irq;
353: br->bus_name = bus_name;
354: }
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