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qemu/hw/acpi/pcihp.c

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/*
* QEMU<->ACPI BIOS PCI hotplug interface
*
* QEMU supports PCI hotplug via ACPI. This module
* implements the interface between QEMU and the ACPI BIOS.
* Interface specification - see docs/specs/acpi_pci_hotplug.txt
*
* Copyright (c) 2013, Red Hat Inc, Michael S. Tsirkin (mst@redhat.com)
* Copyright (c) 2006 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "hw/acpi/pcihp.h"
#include "hw/hw.h"
#include "hw/i386/pc.h"
#include "hw/pci/pci.h"
#include "hw/acpi/acpi.h"
#include "sysemu/sysemu.h"
#include "qemu/range.h"
#include "exec/ioport.h"
#include "exec/address-spaces.h"
#include "hw/pci/pci_bus.h"
#include "qom/qom-qobject.h"
#include "qapi/qmp/qint.h"
//#define DEBUG
#ifdef DEBUG
# define ACPI_PCIHP_DPRINTF(format, ...) printf(format, ## __VA_ARGS__)
#else
# define ACPI_PCIHP_DPRINTF(format, ...) do { } while (0)
#endif
#define ACPI_PCI_HOTPLUG_STATUS 2
#define ACPI_PCIHP_ADDR 0xae00
#define ACPI_PCIHP_SIZE 0x0014
#define ACPI_PCIHP_LEGACY_SIZE 0x000f
#define PCI_UP_BASE 0x0000
#define PCI_DOWN_BASE 0x0004
#define PCI_EJ_BASE 0x0008
#define PCI_RMV_BASE 0x000c
#define PCI_SEL_BASE 0x0010
typedef struct AcpiPciHpFind {
int bsel;
PCIBus *bus;
} AcpiPciHpFind;
static int acpi_pcihp_get_bsel(PCIBus *bus)
{
Error *local_err = NULL;
int64_t bsel = object_property_get_int(OBJECT(bus), ACPI_PCIHP_PROP_BSEL,
&local_err);
if (local_err || bsel < 0 || bsel >= ACPI_PCIHP_MAX_HOTPLUG_BUS) {
if (local_err) {
error_free(local_err);
}
return -1;
} else {
return bsel;
}
}
static void acpi_pcihp_test_hotplug_bus(PCIBus *bus, void *opaque)
{
AcpiPciHpFind *find = opaque;
if (find->bsel == acpi_pcihp_get_bsel(bus)) {
find->bus = bus;
}
}
static PCIBus *acpi_pcihp_find_hotplug_bus(AcpiPciHpState *s, int bsel)
{
AcpiPciHpFind find = { .bsel = bsel, .bus = NULL };
if (bsel < 0) {
return NULL;
}
pci_for_each_bus(s->root, acpi_pcihp_test_hotplug_bus, &find);
/* Make bsel 0 eject root bus if bsel property is not set,
* for compatibility with non acpi setups.
* TODO: really needed?
*/
if (!bsel && !find.bus) {
find.bus = s->root;
}
return find.bus;
}
static bool acpi_pcihp_pc_no_hotplug(AcpiPciHpState *s, PCIDevice *dev)
{
PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
DeviceClass *dc = DEVICE_GET_CLASS(dev);
/*
* ACPI doesn't allow hotplug of bridge devices. Don't allow
* hot-unplug of bridge devices unless they were added by hotplug
* (and so, not described by acpi).
*/
return (pc->is_bridge && !dev->qdev.hotplugged) || !dc->hotpluggable;
}
static void acpi_pcihp_eject_slot(AcpiPciHpState *s, unsigned bsel, unsigned slots)
{
BusChild *kid, *next;
int slot = ffs(slots) - 1;
PCIBus *bus = acpi_pcihp_find_hotplug_bus(s, bsel);
if (!bus) {
return;
}
/* Mark request as complete */
s->acpi_pcihp_pci_status[bsel].down &= ~(1U << slot);
s->acpi_pcihp_pci_status[bsel].up &= ~(1U << slot);
QTAILQ_FOREACH_SAFE(kid, &bus->qbus.children, sibling, next) {
DeviceState *qdev = kid->child;
PCIDevice *dev = PCI_DEVICE(qdev);
if (PCI_SLOT(dev->devfn) == slot) {
if (!acpi_pcihp_pc_no_hotplug(s, dev)) {
object_unparent(OBJECT(qdev));
}
}
}
}
static void acpi_pcihp_update_hotplug_bus(AcpiPciHpState *s, int bsel)
{
BusChild *kid, *next;
PCIBus *bus = acpi_pcihp_find_hotplug_bus(s, bsel);
/* Execute any pending removes during reset */
while (s->acpi_pcihp_pci_status[bsel].down) {
acpi_pcihp_eject_slot(s, bsel, s->acpi_pcihp_pci_status[bsel].down);
}
s->acpi_pcihp_pci_status[bsel].hotplug_enable = ~0;
if (!bus) {
return;
}
QTAILQ_FOREACH_SAFE(kid, &bus->qbus.children, sibling, next) {
DeviceState *qdev = kid->child;
PCIDevice *pdev = PCI_DEVICE(qdev);
int slot = PCI_SLOT(pdev->devfn);
if (acpi_pcihp_pc_no_hotplug(s, pdev)) {
s->acpi_pcihp_pci_status[bsel].hotplug_enable &= ~(1U << slot);
}
}
}
static void acpi_pcihp_update(AcpiPciHpState *s)
{
int i;
for (i = 0; i < ACPI_PCIHP_MAX_HOTPLUG_BUS; ++i) {
acpi_pcihp_update_hotplug_bus(s, i);
}
}
void acpi_pcihp_reset(AcpiPciHpState *s)
{
acpi_pcihp_update(s);
}
void acpi_pcihp_device_plug_cb(ACPIREGS *ar, qemu_irq irq, AcpiPciHpState *s,
DeviceState *dev, Error **errp)
{
PCIDevice *pdev = PCI_DEVICE(dev);
int slot = PCI_SLOT(pdev->devfn);
int bsel = acpi_pcihp_get_bsel(pdev->bus);
if (bsel < 0) {
error_setg(errp, "Unsupported bus. Bus doesn't have property '"
ACPI_PCIHP_PROP_BSEL "' set");
return;
}
/* Don't send event when device is enabled during qemu machine creation:
* it is present on boot, no hotplug event is necessary. We do send an
* event when the device is disabled later. */
if (!dev->hotplugged) {
return;
}
s->acpi_pcihp_pci_status[bsel].up |= (1U << slot);
ar->gpe.sts[0] |= ACPI_PCI_HOTPLUG_STATUS;
acpi_update_sci(ar, irq);
}
void acpi_pcihp_device_unplug_cb(ACPIREGS *ar, qemu_irq irq, AcpiPciHpState *s,
DeviceState *dev, Error **errp)
{
PCIDevice *pdev = PCI_DEVICE(dev);
int slot = PCI_SLOT(pdev->devfn);
int bsel = acpi_pcihp_get_bsel(pdev->bus);
if (bsel < 0) {
error_setg(errp, "Unsupported bus. Bus doesn't have property '"
ACPI_PCIHP_PROP_BSEL "' set");
return;
}
s->acpi_pcihp_pci_status[bsel].down |= (1U << slot);
ar->gpe.sts[0] |= ACPI_PCI_HOTPLUG_STATUS;
acpi_update_sci(ar, irq);
}
static uint64_t pci_read(void *opaque, hwaddr addr, unsigned int size)
{
AcpiPciHpState *s = opaque;
uint32_t val = 0;
int bsel = s->hotplug_select;
if (bsel < 0 || bsel > ACPI_PCIHP_MAX_HOTPLUG_BUS) {
return 0;
}
switch (addr) {
case PCI_UP_BASE:
val = s->acpi_pcihp_pci_status[bsel].up;
if (!s->legacy_piix) {
s->acpi_pcihp_pci_status[bsel].up = 0;
}
ACPI_PCIHP_DPRINTF("pci_up_read %" PRIu32 "\n", val);
break;
case PCI_DOWN_BASE:
val = s->acpi_pcihp_pci_status[bsel].down;
ACPI_PCIHP_DPRINTF("pci_down_read %" PRIu32 "\n", val);
break;
case PCI_EJ_BASE:
/* No feature defined yet */
ACPI_PCIHP_DPRINTF("pci_features_read %" PRIu32 "\n", val);
break;
case PCI_RMV_BASE:
val = s->acpi_pcihp_pci_status[bsel].hotplug_enable;
ACPI_PCIHP_DPRINTF("pci_rmv_read %" PRIu32 "\n", val);
break;
case PCI_SEL_BASE:
val = s->hotplug_select;
ACPI_PCIHP_DPRINTF("pci_sel_read %" PRIu32 "\n", val);
default:
break;
}
return val;
}
static void pci_write(void *opaque, hwaddr addr, uint64_t data,
unsigned int size)
{
AcpiPciHpState *s = opaque;
switch (addr) {
case PCI_EJ_BASE:
if (s->hotplug_select >= ACPI_PCIHP_MAX_HOTPLUG_BUS) {
break;
}
acpi_pcihp_eject_slot(s, s->hotplug_select, data);
ACPI_PCIHP_DPRINTF("pciej write %" HWADDR_PRIx " <== %" PRIu64 "\n",
addr, data);
break;
case PCI_SEL_BASE:
s->hotplug_select = data;
ACPI_PCIHP_DPRINTF("pcisel write %" HWADDR_PRIx " <== %" PRIu64 "\n",
addr, data);
default:
break;
}
}
static const MemoryRegionOps acpi_pcihp_io_ops = {
.read = pci_read,
.write = pci_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
};
void acpi_pcihp_init(AcpiPciHpState *s, PCIBus *root_bus,
MemoryRegion *address_space_io, bool bridges_enabled)
{
uint16_t io_size = ACPI_PCIHP_SIZE;
s->root= root_bus;
s->legacy_piix = !bridges_enabled;
if (s->legacy_piix) {
unsigned *bus_bsel = g_malloc(sizeof *bus_bsel);
io_size = ACPI_PCIHP_LEGACY_SIZE;
*bus_bsel = ACPI_PCIHP_BSEL_DEFAULT;
object_property_add_uint32_ptr(OBJECT(root_bus), ACPI_PCIHP_PROP_BSEL,
bus_bsel, NULL);
}
memory_region_init_io(&s->io, NULL, &acpi_pcihp_io_ops, s,
"acpi-pci-hotplug", io_size);
memory_region_add_subregion(address_space_io, ACPI_PCIHP_ADDR, &s->io);
}
const VMStateDescription vmstate_acpi_pcihp_pci_status = {
.name = "acpi_pcihp_pci_status",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(up, AcpiPciHpPciStatus),
VMSTATE_UINT32(down, AcpiPciHpPciStatus),
VMSTATE_END_OF_LIST()
}
};
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