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db4728e6 MT |
1 | /* |
2 | * QEMU<->ACPI BIOS PCI hotplug interface | |
3 | * | |
4 | * QEMU supports PCI hotplug via ACPI. This module | |
5 | * implements the interface between QEMU and the ACPI BIOS. | |
6 | * Interface specification - see docs/specs/acpi_pci_hotplug.txt | |
7 | * | |
8 | * Copyright (c) 2013, Red Hat Inc, Michael S. Tsirkin (mst@redhat.com) | |
9 | * Copyright (c) 2006 Fabrice Bellard | |
10 | * | |
11 | * This library is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU Lesser General Public | |
13 | * License version 2 as published by the Free Software Foundation. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public | |
21 | * License along with this library; if not, see <http://www.gnu.org/licenses/> | |
22 | * | |
23 | * Contributions after 2012-01-13 are licensed under the terms of the | |
24 | * GNU GPL, version 2 or (at your option) any later version. | |
25 | */ | |
26 | ||
27 | #include "hw/acpi/pcihp.h" | |
28 | ||
29 | #include "hw/hw.h" | |
30 | #include "hw/i386/pc.h" | |
31 | #include "hw/pci/pci.h" | |
32 | #include "hw/acpi/acpi.h" | |
33 | #include "sysemu/sysemu.h" | |
db4728e6 MT |
34 | #include "exec/ioport.h" |
35 | #include "exec/address-spaces.h" | |
36 | #include "hw/pci/pci_bus.h" | |
37 | #include "qom/qom-qobject.h" | |
38 | #include "qapi/qmp/qint.h" | |
39 | ||
40 | //#define DEBUG | |
41 | ||
42 | #ifdef DEBUG | |
43 | # define ACPI_PCIHP_DPRINTF(format, ...) printf(format, ## __VA_ARGS__) | |
44 | #else | |
45 | # define ACPI_PCIHP_DPRINTF(format, ...) do { } while (0) | |
46 | #endif | |
47 | ||
c24d5e0b | 48 | #define ACPI_PCI_HOTPLUG_STATUS 2 |
e358edc8 IM |
49 | #define ACPI_PCIHP_ADDR 0xae00 |
50 | #define ACPI_PCIHP_SIZE 0x0014 | |
51 | #define ACPI_PCIHP_LEGACY_SIZE 0x000f | |
a7b613cf IM |
52 | #define PCI_UP_BASE 0x0000 |
53 | #define PCI_DOWN_BASE 0x0004 | |
54 | #define PCI_EJ_BASE 0x0008 | |
55 | #define PCI_RMV_BASE 0x000c | |
56 | #define PCI_SEL_BASE 0x0010 | |
db4728e6 MT |
57 | |
58 | typedef struct AcpiPciHpFind { | |
59 | int bsel; | |
60 | PCIBus *bus; | |
61 | } AcpiPciHpFind; | |
62 | ||
63 | static int acpi_pcihp_get_bsel(PCIBus *bus) | |
64 | { | |
7c38ecd0 KB |
65 | Error *local_err = NULL; |
66 | int64_t bsel = object_property_get_int(OBJECT(bus), ACPI_PCIHP_PROP_BSEL, | |
67 | &local_err); | |
68 | ||
69 | if (local_err || bsel < 0 || bsel >= ACPI_PCIHP_MAX_HOTPLUG_BUS) { | |
70 | if (local_err) { | |
71 | error_free(local_err); | |
72 | } | |
db4728e6 | 73 | return -1; |
7c38ecd0 KB |
74 | } else { |
75 | return bsel; | |
db4728e6 | 76 | } |
db4728e6 MT |
77 | } |
78 | ||
79 | static void acpi_pcihp_test_hotplug_bus(PCIBus *bus, void *opaque) | |
80 | { | |
81 | AcpiPciHpFind *find = opaque; | |
82 | if (find->bsel == acpi_pcihp_get_bsel(bus)) { | |
83 | find->bus = bus; | |
84 | } | |
85 | } | |
86 | ||
87 | static PCIBus *acpi_pcihp_find_hotplug_bus(AcpiPciHpState *s, int bsel) | |
88 | { | |
89 | AcpiPciHpFind find = { .bsel = bsel, .bus = NULL }; | |
90 | ||
91 | if (bsel < 0) { | |
92 | return NULL; | |
93 | } | |
94 | ||
95 | pci_for_each_bus(s->root, acpi_pcihp_test_hotplug_bus, &find); | |
96 | ||
97 | /* Make bsel 0 eject root bus if bsel property is not set, | |
98 | * for compatibility with non acpi setups. | |
99 | * TODO: really needed? | |
100 | */ | |
101 | if (!bsel && !find.bus) { | |
102 | find.bus = s->root; | |
103 | } | |
104 | return find.bus; | |
105 | } | |
106 | ||
107 | static bool acpi_pcihp_pc_no_hotplug(AcpiPciHpState *s, PCIDevice *dev) | |
108 | { | |
109 | PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev); | |
2897ae02 | 110 | DeviceClass *dc = DEVICE_GET_CLASS(dev); |
db4728e6 MT |
111 | /* |
112 | * ACPI doesn't allow hotplug of bridge devices. Don't allow | |
113 | * hot-unplug of bridge devices unless they were added by hotplug | |
114 | * (and so, not described by acpi). | |
115 | */ | |
2897ae02 | 116 | return (pc->is_bridge && !dev->qdev.hotplugged) || !dc->hotpluggable; |
db4728e6 MT |
117 | } |
118 | ||
119 | static void acpi_pcihp_eject_slot(AcpiPciHpState *s, unsigned bsel, unsigned slots) | |
120 | { | |
121 | BusChild *kid, *next; | |
786a4ea8 | 122 | int slot = ctz32(slots); |
db4728e6 MT |
123 | PCIBus *bus = acpi_pcihp_find_hotplug_bus(s, bsel); |
124 | ||
125 | if (!bus) { | |
126 | return; | |
127 | } | |
128 | ||
129 | /* Mark request as complete */ | |
130 | s->acpi_pcihp_pci_status[bsel].down &= ~(1U << slot); | |
5a2223ca | 131 | s->acpi_pcihp_pci_status[bsel].up &= ~(1U << slot); |
db4728e6 MT |
132 | |
133 | QTAILQ_FOREACH_SAFE(kid, &bus->qbus.children, sibling, next) { | |
134 | DeviceState *qdev = kid->child; | |
135 | PCIDevice *dev = PCI_DEVICE(qdev); | |
136 | if (PCI_SLOT(dev->devfn) == slot) { | |
5a2223ca | 137 | if (!acpi_pcihp_pc_no_hotplug(s, dev)) { |
db4728e6 MT |
138 | object_unparent(OBJECT(qdev)); |
139 | } | |
140 | } | |
141 | } | |
db4728e6 MT |
142 | } |
143 | ||
144 | static void acpi_pcihp_update_hotplug_bus(AcpiPciHpState *s, int bsel) | |
145 | { | |
146 | BusChild *kid, *next; | |
147 | PCIBus *bus = acpi_pcihp_find_hotplug_bus(s, bsel); | |
148 | ||
149 | /* Execute any pending removes during reset */ | |
150 | while (s->acpi_pcihp_pci_status[bsel].down) { | |
151 | acpi_pcihp_eject_slot(s, bsel, s->acpi_pcihp_pci_status[bsel].down); | |
152 | } | |
153 | ||
154 | s->acpi_pcihp_pci_status[bsel].hotplug_enable = ~0; | |
db4728e6 MT |
155 | |
156 | if (!bus) { | |
157 | return; | |
158 | } | |
159 | QTAILQ_FOREACH_SAFE(kid, &bus->qbus.children, sibling, next) { | |
160 | DeviceState *qdev = kid->child; | |
161 | PCIDevice *pdev = PCI_DEVICE(qdev); | |
162 | int slot = PCI_SLOT(pdev->devfn); | |
163 | ||
164 | if (acpi_pcihp_pc_no_hotplug(s, pdev)) { | |
165 | s->acpi_pcihp_pci_status[bsel].hotplug_enable &= ~(1U << slot); | |
166 | } | |
db4728e6 MT |
167 | } |
168 | } | |
169 | ||
170 | static void acpi_pcihp_update(AcpiPciHpState *s) | |
171 | { | |
172 | int i; | |
173 | ||
174 | for (i = 0; i < ACPI_PCIHP_MAX_HOTPLUG_BUS; ++i) { | |
175 | acpi_pcihp_update_hotplug_bus(s, i); | |
176 | } | |
177 | } | |
178 | ||
179 | void acpi_pcihp_reset(AcpiPciHpState *s) | |
180 | { | |
181 | acpi_pcihp_update(s); | |
182 | } | |
183 | ||
c24d5e0b IM |
184 | void acpi_pcihp_device_plug_cb(ACPIREGS *ar, qemu_irq irq, AcpiPciHpState *s, |
185 | DeviceState *dev, Error **errp) | |
db4728e6 | 186 | { |
c24d5e0b IM |
187 | PCIDevice *pdev = PCI_DEVICE(dev); |
188 | int slot = PCI_SLOT(pdev->devfn); | |
189 | int bsel = acpi_pcihp_get_bsel(pdev->bus); | |
db4728e6 | 190 | if (bsel < 0) { |
c24d5e0b IM |
191 | error_setg(errp, "Unsupported bus. Bus doesn't have property '" |
192 | ACPI_PCIHP_PROP_BSEL "' set"); | |
193 | return; | |
db4728e6 MT |
194 | } |
195 | ||
196 | /* Don't send event when device is enabled during qemu machine creation: | |
197 | * it is present on boot, no hotplug event is necessary. We do send an | |
198 | * event when the device is disabled later. */ | |
c24d5e0b IM |
199 | if (!dev->hotplugged) { |
200 | return; | |
db4728e6 MT |
201 | } |
202 | ||
c24d5e0b IM |
203 | s->acpi_pcihp_pci_status[bsel].up |= (1U << slot); |
204 | ||
205 | ar->gpe.sts[0] |= ACPI_PCI_HOTPLUG_STATUS; | |
206 | acpi_update_sci(ar, irq); | |
207 | } | |
208 | ||
209 | void acpi_pcihp_device_unplug_cb(ACPIREGS *ar, qemu_irq irq, AcpiPciHpState *s, | |
210 | DeviceState *dev, Error **errp) | |
211 | { | |
212 | PCIDevice *pdev = PCI_DEVICE(dev); | |
213 | int slot = PCI_SLOT(pdev->devfn); | |
214 | int bsel = acpi_pcihp_get_bsel(pdev->bus); | |
215 | if (bsel < 0) { | |
216 | error_setg(errp, "Unsupported bus. Bus doesn't have property '" | |
217 | ACPI_PCIHP_PROP_BSEL "' set"); | |
218 | return; | |
db4728e6 MT |
219 | } |
220 | ||
c24d5e0b IM |
221 | s->acpi_pcihp_pci_status[bsel].down |= (1U << slot); |
222 | ||
223 | ar->gpe.sts[0] |= ACPI_PCI_HOTPLUG_STATUS; | |
224 | acpi_update_sci(ar, irq); | |
db4728e6 MT |
225 | } |
226 | ||
227 | static uint64_t pci_read(void *opaque, hwaddr addr, unsigned int size) | |
228 | { | |
229 | AcpiPciHpState *s = opaque; | |
230 | uint32_t val = 0; | |
231 | int bsel = s->hotplug_select; | |
232 | ||
fa365d7c | 233 | if (bsel < 0 || bsel >= ACPI_PCIHP_MAX_HOTPLUG_BUS) { |
db4728e6 MT |
234 | return 0; |
235 | } | |
236 | ||
237 | switch (addr) { | |
a7b613cf | 238 | case PCI_UP_BASE: |
5a2223ca | 239 | val = s->acpi_pcihp_pci_status[bsel].up; |
99d09dd3 IM |
240 | if (!s->legacy_piix) { |
241 | s->acpi_pcihp_pci_status[bsel].up = 0; | |
242 | } | |
db4728e6 MT |
243 | ACPI_PCIHP_DPRINTF("pci_up_read %" PRIu32 "\n", val); |
244 | break; | |
a7b613cf | 245 | case PCI_DOWN_BASE: |
db4728e6 MT |
246 | val = s->acpi_pcihp_pci_status[bsel].down; |
247 | ACPI_PCIHP_DPRINTF("pci_down_read %" PRIu32 "\n", val); | |
248 | break; | |
a7b613cf | 249 | case PCI_EJ_BASE: |
db4728e6 MT |
250 | /* No feature defined yet */ |
251 | ACPI_PCIHP_DPRINTF("pci_features_read %" PRIu32 "\n", val); | |
252 | break; | |
a7b613cf | 253 | case PCI_RMV_BASE: |
db4728e6 MT |
254 | val = s->acpi_pcihp_pci_status[bsel].hotplug_enable; |
255 | ACPI_PCIHP_DPRINTF("pci_rmv_read %" PRIu32 "\n", val); | |
256 | break; | |
a7b613cf | 257 | case PCI_SEL_BASE: |
db4728e6 MT |
258 | val = s->hotplug_select; |
259 | ACPI_PCIHP_DPRINTF("pci_sel_read %" PRIu32 "\n", val); | |
260 | default: | |
261 | break; | |
262 | } | |
263 | ||
264 | return val; | |
265 | } | |
266 | ||
267 | static void pci_write(void *opaque, hwaddr addr, uint64_t data, | |
268 | unsigned int size) | |
269 | { | |
270 | AcpiPciHpState *s = opaque; | |
271 | switch (addr) { | |
a7b613cf | 272 | case PCI_EJ_BASE: |
db4728e6 MT |
273 | if (s->hotplug_select >= ACPI_PCIHP_MAX_HOTPLUG_BUS) { |
274 | break; | |
275 | } | |
276 | acpi_pcihp_eject_slot(s, s->hotplug_select, data); | |
277 | ACPI_PCIHP_DPRINTF("pciej write %" HWADDR_PRIx " <== %" PRIu64 "\n", | |
278 | addr, data); | |
279 | break; | |
a7b613cf | 280 | case PCI_SEL_BASE: |
db4728e6 MT |
281 | s->hotplug_select = data; |
282 | ACPI_PCIHP_DPRINTF("pcisel write %" HWADDR_PRIx " <== %" PRIu64 "\n", | |
283 | addr, data); | |
284 | default: | |
285 | break; | |
286 | } | |
287 | } | |
288 | ||
289 | static const MemoryRegionOps acpi_pcihp_io_ops = { | |
290 | .read = pci_read, | |
291 | .write = pci_write, | |
292 | .endianness = DEVICE_LITTLE_ENDIAN, | |
293 | .valid = { | |
294 | .min_access_size = 4, | |
295 | .max_access_size = 4, | |
296 | }, | |
297 | }; | |
298 | ||
78c2d872 | 299 | void acpi_pcihp_init(Object *owner, AcpiPciHpState *s, PCIBus *root_bus, |
99d09dd3 | 300 | MemoryRegion *address_space_io, bool bridges_enabled) |
db4728e6 | 301 | { |
78c2d872 IM |
302 | s->io_len = ACPI_PCIHP_SIZE; |
303 | s->io_base = ACPI_PCIHP_ADDR; | |
e358edc8 | 304 | |
db4728e6 | 305 | s->root= root_bus; |
99d09dd3 | 306 | s->legacy_piix = !bridges_enabled; |
e358edc8 IM |
307 | |
308 | if (s->legacy_piix) { | |
309 | unsigned *bus_bsel = g_malloc(sizeof *bus_bsel); | |
310 | ||
78c2d872 | 311 | s->io_len = ACPI_PCIHP_LEGACY_SIZE; |
e358edc8 IM |
312 | |
313 | *bus_bsel = ACPI_PCIHP_BSEL_DEFAULT; | |
314 | object_property_add_uint32_ptr(OBJECT(root_bus), ACPI_PCIHP_PROP_BSEL, | |
315 | bus_bsel, NULL); | |
316 | } | |
317 | ||
78c2d872 IM |
318 | memory_region_init_io(&s->io, owner, &acpi_pcihp_io_ops, s, |
319 | "acpi-pci-hotplug", s->io_len); | |
320 | memory_region_add_subregion(address_space_io, s->io_base, &s->io); | |
321 | ||
322 | object_property_add_uint16_ptr(owner, ACPI_PCIHP_IO_BASE_PROP, &s->io_base, | |
323 | &error_abort); | |
324 | object_property_add_uint16_ptr(owner, ACPI_PCIHP_IO_LEN_PROP, &s->io_len, | |
325 | &error_abort); | |
db4728e6 MT |
326 | } |
327 | ||
328 | const VMStateDescription vmstate_acpi_pcihp_pci_status = { | |
329 | .name = "acpi_pcihp_pci_status", | |
330 | .version_id = 1, | |
331 | .minimum_version_id = 1, | |
d49805ae | 332 | .fields = (VMStateField[]) { |
db4728e6 MT |
333 | VMSTATE_UINT32(up, AcpiPciHpPciStatus), |
334 | VMSTATE_UINT32(down, AcpiPciHpPciStatus), | |
335 | VMSTATE_END_OF_LIST() | |
336 | } | |
337 | }; |