2 * QEMU<->ACPI BIOS PCI hotplug interface
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
8 * Copyright (c) 2013, Red Hat Inc, Michael S. Tsirkin (mst@redhat.com)
9 * Copyright (c) 2006 Fabrice Bellard
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.
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.
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/>
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.
27 #include "hw/acpi/pcihp.h"
30 #include "hw/i386/pc.h"
31 #include "hw/pci/pci.h"
32 #include "hw/acpi/acpi.h"
33 #include "sysemu/sysemu.h"
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"
43 # define ACPI_PCIHP_DPRINTF(format, ...) printf(format, ## __VA_ARGS__)
45 # define ACPI_PCIHP_DPRINTF(format, ...) do { } while (0)
48 #define ACPI_PCI_HOTPLUG_STATUS 2
49 #define ACPI_PCIHP_ADDR 0xae00
50 #define ACPI_PCIHP_SIZE 0x0014
51 #define ACPI_PCIHP_LEGACY_SIZE 0x000f
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
58 typedef struct AcpiPciHpFind
{
63 static int acpi_pcihp_get_bsel(PCIBus
*bus
)
65 Error
*local_err
= NULL
;
66 int64_t bsel
= object_property_get_int(OBJECT(bus
), ACPI_PCIHP_PROP_BSEL
,
69 if (local_err
|| bsel
< 0 || bsel
>= ACPI_PCIHP_MAX_HOTPLUG_BUS
) {
71 error_free(local_err
);
79 static void acpi_pcihp_test_hotplug_bus(PCIBus
*bus
, void *opaque
)
81 AcpiPciHpFind
*find
= opaque
;
82 if (find
->bsel
== acpi_pcihp_get_bsel(bus
)) {
87 static PCIBus
*acpi_pcihp_find_hotplug_bus(AcpiPciHpState
*s
, int bsel
)
89 AcpiPciHpFind find
= { .bsel
= bsel
, .bus
= NULL
};
95 pci_for_each_bus(s
->root
, acpi_pcihp_test_hotplug_bus
, &find
);
97 /* Make bsel 0 eject root bus if bsel property is not set,
98 * for compatibility with non acpi setups.
99 * TODO: really needed?
101 if (!bsel
&& !find
.bus
) {
107 static bool acpi_pcihp_pc_no_hotplug(AcpiPciHpState
*s
, PCIDevice
*dev
)
109 PCIDeviceClass
*pc
= PCI_DEVICE_GET_CLASS(dev
);
110 DeviceClass
*dc
= DEVICE_GET_CLASS(dev
);
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).
116 return (pc
->is_bridge
&& !dev
->qdev
.hotplugged
) || !dc
->hotpluggable
;
119 static void acpi_pcihp_eject_slot(AcpiPciHpState
*s
, unsigned bsel
, unsigned slots
)
121 BusChild
*kid
, *next
;
122 int slot
= ctz32(slots
);
123 PCIBus
*bus
= acpi_pcihp_find_hotplug_bus(s
, bsel
);
129 /* Mark request as complete */
130 s
->acpi_pcihp_pci_status
[bsel
].down
&= ~(1U << slot
);
131 s
->acpi_pcihp_pci_status
[bsel
].up
&= ~(1U << slot
);
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
) {
137 if (!acpi_pcihp_pc_no_hotplug(s
, dev
)) {
138 object_unparent(OBJECT(qdev
));
144 static void acpi_pcihp_update_hotplug_bus(AcpiPciHpState
*s
, int bsel
)
146 BusChild
*kid
, *next
;
147 PCIBus
*bus
= acpi_pcihp_find_hotplug_bus(s
, bsel
);
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
);
154 s
->acpi_pcihp_pci_status
[bsel
].hotplug_enable
= ~0;
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
);
164 if (acpi_pcihp_pc_no_hotplug(s
, pdev
)) {
165 s
->acpi_pcihp_pci_status
[bsel
].hotplug_enable
&= ~(1U << slot
);
170 static void acpi_pcihp_update(AcpiPciHpState
*s
)
174 for (i
= 0; i
< ACPI_PCIHP_MAX_HOTPLUG_BUS
; ++i
) {
175 acpi_pcihp_update_hotplug_bus(s
, i
);
179 void acpi_pcihp_reset(AcpiPciHpState
*s
)
181 acpi_pcihp_update(s
);
184 void acpi_pcihp_device_plug_cb(ACPIREGS
*ar
, qemu_irq irq
, AcpiPciHpState
*s
,
185 DeviceState
*dev
, Error
**errp
)
187 PCIDevice
*pdev
= PCI_DEVICE(dev
);
188 int slot
= PCI_SLOT(pdev
->devfn
);
189 int bsel
= acpi_pcihp_get_bsel(pdev
->bus
);
191 error_setg(errp
, "Unsupported bus. Bus doesn't have property '"
192 ACPI_PCIHP_PROP_BSEL
"' set");
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. */
199 if (!dev
->hotplugged
) {
203 s
->acpi_pcihp_pci_status
[bsel
].up
|= (1U << slot
);
205 ar
->gpe
.sts
[0] |= ACPI_PCI_HOTPLUG_STATUS
;
206 acpi_update_sci(ar
, irq
);
209 void acpi_pcihp_device_unplug_cb(ACPIREGS
*ar
, qemu_irq irq
, AcpiPciHpState
*s
,
210 DeviceState
*dev
, Error
**errp
)
212 PCIDevice
*pdev
= PCI_DEVICE(dev
);
213 int slot
= PCI_SLOT(pdev
->devfn
);
214 int bsel
= acpi_pcihp_get_bsel(pdev
->bus
);
216 error_setg(errp
, "Unsupported bus. Bus doesn't have property '"
217 ACPI_PCIHP_PROP_BSEL
"' set");
221 s
->acpi_pcihp_pci_status
[bsel
].down
|= (1U << slot
);
223 ar
->gpe
.sts
[0] |= ACPI_PCI_HOTPLUG_STATUS
;
224 acpi_update_sci(ar
, irq
);
227 static uint64_t pci_read(void *opaque
, hwaddr addr
, unsigned int size
)
229 AcpiPciHpState
*s
= opaque
;
231 int bsel
= s
->hotplug_select
;
233 if (bsel
< 0 || bsel
>= ACPI_PCIHP_MAX_HOTPLUG_BUS
) {
239 val
= s
->acpi_pcihp_pci_status
[bsel
].up
;
240 if (!s
->legacy_piix
) {
241 s
->acpi_pcihp_pci_status
[bsel
].up
= 0;
243 ACPI_PCIHP_DPRINTF("pci_up_read %" PRIu32
"\n", val
);
246 val
= s
->acpi_pcihp_pci_status
[bsel
].down
;
247 ACPI_PCIHP_DPRINTF("pci_down_read %" PRIu32
"\n", val
);
250 /* No feature defined yet */
251 ACPI_PCIHP_DPRINTF("pci_features_read %" PRIu32
"\n", val
);
254 val
= s
->acpi_pcihp_pci_status
[bsel
].hotplug_enable
;
255 ACPI_PCIHP_DPRINTF("pci_rmv_read %" PRIu32
"\n", val
);
258 val
= s
->hotplug_select
;
259 ACPI_PCIHP_DPRINTF("pci_sel_read %" PRIu32
"\n", val
);
267 static void pci_write(void *opaque
, hwaddr addr
, uint64_t data
,
270 AcpiPciHpState
*s
= opaque
;
273 if (s
->hotplug_select
>= ACPI_PCIHP_MAX_HOTPLUG_BUS
) {
276 acpi_pcihp_eject_slot(s
, s
->hotplug_select
, data
);
277 ACPI_PCIHP_DPRINTF("pciej write %" HWADDR_PRIx
" <== %" PRIu64
"\n",
281 s
->hotplug_select
= data
;
282 ACPI_PCIHP_DPRINTF("pcisel write %" HWADDR_PRIx
" <== %" PRIu64
"\n",
289 static const MemoryRegionOps acpi_pcihp_io_ops
= {
292 .endianness
= DEVICE_LITTLE_ENDIAN
,
294 .min_access_size
= 4,
295 .max_access_size
= 4,
299 void acpi_pcihp_init(Object
*owner
, AcpiPciHpState
*s
, PCIBus
*root_bus
,
300 MemoryRegion
*address_space_io
, bool bridges_enabled
)
302 s
->io_len
= ACPI_PCIHP_SIZE
;
303 s
->io_base
= ACPI_PCIHP_ADDR
;
306 s
->legacy_piix
= !bridges_enabled
;
308 if (s
->legacy_piix
) {
309 unsigned *bus_bsel
= g_malloc(sizeof *bus_bsel
);
311 s
->io_len
= ACPI_PCIHP_LEGACY_SIZE
;
313 *bus_bsel
= ACPI_PCIHP_BSEL_DEFAULT
;
314 object_property_add_uint32_ptr(OBJECT(root_bus
), ACPI_PCIHP_PROP_BSEL
,
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
);
322 object_property_add_uint16_ptr(owner
, ACPI_PCIHP_IO_BASE_PROP
, &s
->io_base
,
324 object_property_add_uint16_ptr(owner
, ACPI_PCIHP_IO_LEN_PROP
, &s
->io_len
,
328 const VMStateDescription vmstate_acpi_pcihp_pci_status
= {
329 .name
= "acpi_pcihp_pci_status",
331 .minimum_version_id
= 1,
332 .fields
= (VMStateField
[]) {
333 VMSTATE_UINT32(up
, AcpiPciHpPciStatus
),
334 VMSTATE_UINT32(down
, AcpiPciHpPciStatus
),
335 VMSTATE_END_OF_LIST()