it helps to avoid device naming conflicts when guest OS is configured to use acpi-index for naming. Spec ialso says so: PCI Firmware Specification Revision 3.2 4.6.7. _DSM for Naming a PCI or PCI Express Device Under Operating Systems " Instance number must be unique under \_SB scope. This instance number does not have to be sequential in a given system configuration. " Signed-off-by: Igor Mammedov <imammedo@redhat.com> Message-Id: <20210315180102.3008391-4-imammedo@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
526 lines
15 KiB
C
526 lines
15 KiB
C
/*
|
|
* 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 2.1 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 "qemu/osdep.h"
|
|
#include "hw/acpi/pcihp.h"
|
|
|
|
#include "hw/pci-host/i440fx.h"
|
|
#include "hw/pci/pci.h"
|
|
#include "hw/pci/pci_bridge.h"
|
|
#include "hw/acpi/acpi.h"
|
|
#include "exec/address-spaces.h"
|
|
#include "hw/pci/pci_bus.h"
|
|
#include "migration/vmstate.h"
|
|
#include "qapi/error.h"
|
|
#include "qom/qom-qobject.h"
|
|
#include "trace.h"
|
|
|
|
#define ACPI_PCIHP_ADDR 0xae00
|
|
#define ACPI_PCIHP_SIZE 0x0018
|
|
#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
|
|
#define PCI_AIDX_BASE 0x0014
|
|
|
|
typedef struct AcpiPciHpFind {
|
|
int bsel;
|
|
PCIBus *bus;
|
|
} AcpiPciHpFind;
|
|
|
|
static gint g_cmp_uint32(gconstpointer a, gconstpointer b, gpointer user_data)
|
|
{
|
|
return a - b;
|
|
}
|
|
|
|
static GSequence *pci_acpi_index_list(void)
|
|
{
|
|
static GSequence *used_acpi_index_list;
|
|
|
|
if (!used_acpi_index_list) {
|
|
used_acpi_index_list = g_sequence_new(NULL);
|
|
}
|
|
return used_acpi_index_list;
|
|
}
|
|
|
|
static int acpi_pcihp_get_bsel(PCIBus *bus)
|
|
{
|
|
Error *local_err = NULL;
|
|
uint64_t bsel = object_property_get_uint(OBJECT(bus), ACPI_PCIHP_PROP_BSEL,
|
|
&local_err);
|
|
|
|
if (local_err || bsel >= ACPI_PCIHP_MAX_HOTPLUG_BUS) {
|
|
if (local_err) {
|
|
error_free(local_err);
|
|
}
|
|
return -1;
|
|
} else {
|
|
return bsel;
|
|
}
|
|
}
|
|
|
|
/* Assign BSEL property to all buses. In the future, this can be changed
|
|
* to only assign to buses that support hotplug.
|
|
*/
|
|
static void *acpi_set_bsel(PCIBus *bus, void *opaque)
|
|
{
|
|
unsigned *bsel_alloc = opaque;
|
|
unsigned *bus_bsel;
|
|
|
|
if (qbus_is_hotpluggable(BUS(bus))) {
|
|
bus_bsel = g_malloc(sizeof *bus_bsel);
|
|
|
|
*bus_bsel = (*bsel_alloc)++;
|
|
object_property_add_uint32_ptr(OBJECT(bus), ACPI_PCIHP_PROP_BSEL,
|
|
bus_bsel, OBJ_PROP_FLAG_READ);
|
|
}
|
|
|
|
return bsel_alloc;
|
|
}
|
|
|
|
static void acpi_set_pci_info(void)
|
|
{
|
|
static bool bsel_is_set;
|
|
PCIBus *bus;
|
|
unsigned bsel_alloc = ACPI_PCIHP_BSEL_DEFAULT;
|
|
|
|
if (bsel_is_set) {
|
|
return;
|
|
}
|
|
bsel_is_set = true;
|
|
|
|
bus = find_i440fx(); /* TODO: Q35 support */
|
|
if (bus) {
|
|
/* Scan all PCI buses. Set property to enable acpi based hotplug. */
|
|
pci_for_each_bus_depth_first(bus, acpi_set_bsel, NULL, &bsel_alloc);
|
|
}
|
|
}
|
|
|
|
static void acpi_pcihp_disable_root_bus(void)
|
|
{
|
|
static bool root_hp_disabled;
|
|
PCIBus *bus;
|
|
|
|
if (root_hp_disabled) {
|
|
return;
|
|
}
|
|
|
|
bus = find_i440fx();
|
|
if (bus) {
|
|
/* setting the hotplug handler to NULL makes the bus non-hotpluggable */
|
|
qbus_set_hotplug_handler(BUS(bus), NULL);
|
|
}
|
|
root_hp_disabled = true;
|
|
return;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Check if find.bus is actually hotpluggable. If bsel is set to
|
|
* NULL for example on the root bus in order to make it
|
|
* non-hotpluggable, find.bus will match the root bus when bsel
|
|
* is 0. See acpi_pcihp_test_hotplug_bus() above. Since the
|
|
* bus is not hotpluggable however, we should not select the bus.
|
|
* Instead, we should set find.bus to NULL in that case. In the check
|
|
* below, we generalize this case for all buses, not just the root bus.
|
|
* The callers of this function check for a null return value and
|
|
* handle them appropriately.
|
|
*/
|
|
if (find.bus && !qbus_is_hotpluggable(BUS(find.bus))) {
|
|
find.bus = NULL;
|
|
}
|
|
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)
|
|
{
|
|
HotplugHandler *hotplug_ctrl;
|
|
BusChild *kid, *next;
|
|
int slot = ctz32(slots);
|
|
PCIBus *bus = acpi_pcihp_find_hotplug_bus(s, bsel);
|
|
|
|
trace_acpi_pci_eject_slot(bsel, slot);
|
|
|
|
if (!bus || slot > 31) {
|
|
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)) {
|
|
hotplug_ctrl = qdev_get_hotplug_handler(qdev);
|
|
hotplug_handler_unplug(hotplug_ctrl, qdev, &error_abort);
|
|
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, bool acpihp_root_off)
|
|
{
|
|
if (acpihp_root_off) {
|
|
acpi_pcihp_disable_root_bus();
|
|
}
|
|
acpi_set_pci_info();
|
|
acpi_pcihp_update(s);
|
|
}
|
|
|
|
#define ONBOARD_INDEX_MAX (16 * 1024 - 1)
|
|
|
|
void acpi_pcihp_device_pre_plug_cb(HotplugHandler *hotplug_dev,
|
|
DeviceState *dev, Error **errp)
|
|
{
|
|
PCIDevice *pdev = PCI_DEVICE(dev);
|
|
|
|
/* Only hotplugged devices need the hotplug capability. */
|
|
if (dev->hotplugged &&
|
|
acpi_pcihp_get_bsel(pci_get_bus(PCI_DEVICE(dev))) < 0) {
|
|
error_setg(errp, "Unsupported bus. Bus doesn't have property '"
|
|
ACPI_PCIHP_PROP_BSEL "' set");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* capped by systemd (see: udev-builtin-net_id.c)
|
|
* as it's the only known user honor it to avoid users
|
|
* misconfigure QEMU and then wonder why acpi-index doesn't work
|
|
*/
|
|
if (pdev->acpi_index > ONBOARD_INDEX_MAX) {
|
|
error_setg(errp, "acpi-index should be less or equal to %u",
|
|
ONBOARD_INDEX_MAX);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* make sure that acpi-index is unique across all present PCI devices
|
|
*/
|
|
if (pdev->acpi_index) {
|
|
GSequence *used_indexes = pci_acpi_index_list();
|
|
|
|
if (g_sequence_lookup(used_indexes, GINT_TO_POINTER(pdev->acpi_index),
|
|
g_cmp_uint32, NULL)) {
|
|
error_setg(errp, "a PCI device with acpi-index = %" PRIu32
|
|
" already exist", pdev->acpi_index);
|
|
return;
|
|
}
|
|
g_sequence_insert_sorted(used_indexes,
|
|
GINT_TO_POINTER(pdev->acpi_index),
|
|
g_cmp_uint32, NULL);
|
|
}
|
|
}
|
|
|
|
void acpi_pcihp_device_plug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
|
|
DeviceState *dev, Error **errp)
|
|
{
|
|
PCIDevice *pdev = PCI_DEVICE(dev);
|
|
int slot = PCI_SLOT(pdev->devfn);
|
|
int bsel;
|
|
|
|
/* 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) {
|
|
/*
|
|
* Overwrite the default hotplug handler with the ACPI PCI one
|
|
* for cold plugged bridges only.
|
|
*/
|
|
if (!s->legacy_piix &&
|
|
object_dynamic_cast(OBJECT(dev), TYPE_PCI_BRIDGE)) {
|
|
PCIBus *sec = pci_bridge_get_sec_bus(PCI_BRIDGE(pdev));
|
|
|
|
qbus_set_hotplug_handler(BUS(sec), OBJECT(hotplug_dev));
|
|
/* We don't have to overwrite any other hotplug handler yet */
|
|
assert(QLIST_EMPTY(&sec->child));
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
bsel = acpi_pcihp_get_bsel(pci_get_bus(pdev));
|
|
g_assert(bsel >= 0);
|
|
s->acpi_pcihp_pci_status[bsel].up |= (1U << slot);
|
|
acpi_send_event(DEVICE(hotplug_dev), ACPI_PCI_HOTPLUG_STATUS);
|
|
}
|
|
|
|
void acpi_pcihp_device_unplug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
|
|
DeviceState *dev, Error **errp)
|
|
{
|
|
PCIDevice *pdev = PCI_DEVICE(dev);
|
|
|
|
trace_acpi_pci_unplug(PCI_SLOT(PCI_DEVICE(dev)->devfn),
|
|
acpi_pcihp_get_bsel(pci_get_bus(PCI_DEVICE(dev))));
|
|
|
|
/*
|
|
* clean up acpi-index so it could reused by another device
|
|
*/
|
|
if (pdev->acpi_index) {
|
|
GSequence *used_indexes = pci_acpi_index_list();
|
|
|
|
g_sequence_remove(g_sequence_lookup(used_indexes,
|
|
GINT_TO_POINTER(pdev->acpi_index),
|
|
g_cmp_uint32, NULL));
|
|
}
|
|
|
|
qdev_unrealize(dev);
|
|
}
|
|
|
|
void acpi_pcihp_device_unplug_request_cb(HotplugHandler *hotplug_dev,
|
|
AcpiPciHpState *s, DeviceState *dev,
|
|
Error **errp)
|
|
{
|
|
PCIDevice *pdev = PCI_DEVICE(dev);
|
|
int slot = PCI_SLOT(pdev->devfn);
|
|
int bsel = acpi_pcihp_get_bsel(pci_get_bus(pdev));
|
|
|
|
trace_acpi_pci_unplug_request(bsel, slot);
|
|
|
|
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);
|
|
acpi_send_event(DEVICE(hotplug_dev), ACPI_PCI_HOTPLUG_STATUS);
|
|
}
|
|
|
|
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;
|
|
}
|
|
trace_acpi_pci_up_read(val);
|
|
break;
|
|
case PCI_DOWN_BASE:
|
|
val = s->acpi_pcihp_pci_status[bsel].down;
|
|
trace_acpi_pci_down_read(val);
|
|
break;
|
|
case PCI_EJ_BASE:
|
|
trace_acpi_pci_features_read(val);
|
|
break;
|
|
case PCI_RMV_BASE:
|
|
val = s->acpi_pcihp_pci_status[bsel].hotplug_enable;
|
|
trace_acpi_pci_rmv_read(val);
|
|
break;
|
|
case PCI_SEL_BASE:
|
|
val = s->hotplug_select;
|
|
trace_acpi_pci_sel_read(val);
|
|
break;
|
|
case PCI_AIDX_BASE:
|
|
val = s->acpi_index;
|
|
s->acpi_index = 0;
|
|
trace_acpi_pci_acpi_index_read(val);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
static void pci_write(void *opaque, hwaddr addr, uint64_t data,
|
|
unsigned int size)
|
|
{
|
|
int slot;
|
|
PCIBus *bus;
|
|
BusChild *kid, *next;
|
|
AcpiPciHpState *s = opaque;
|
|
|
|
s->acpi_index = 0;
|
|
switch (addr) {
|
|
case PCI_AIDX_BASE:
|
|
/*
|
|
* fetch acpi-index for specified slot so that follow up read from
|
|
* PCI_AIDX_BASE can return it to guest
|
|
*/
|
|
slot = ctz32(data);
|
|
|
|
if (s->hotplug_select >= ACPI_PCIHP_MAX_HOTPLUG_BUS) {
|
|
break;
|
|
}
|
|
|
|
bus = acpi_pcihp_find_hotplug_bus(s, s->hotplug_select);
|
|
QTAILQ_FOREACH_SAFE(kid, &bus->qbus.children, sibling, next) {
|
|
Object *o = OBJECT(kid->child);
|
|
PCIDevice *dev = PCI_DEVICE(o);
|
|
if (PCI_SLOT(dev->devfn) == slot) {
|
|
s->acpi_index = object_property_get_uint(o, "acpi-index", NULL);
|
|
break;
|
|
}
|
|
}
|
|
trace_acpi_pci_acpi_index_write(s->hotplug_select, slot, s->acpi_index);
|
|
break;
|
|
case PCI_EJ_BASE:
|
|
if (s->hotplug_select >= ACPI_PCIHP_MAX_HOTPLUG_BUS) {
|
|
break;
|
|
}
|
|
acpi_pcihp_eject_slot(s, s->hotplug_select, data);
|
|
trace_acpi_pci_ej_write(addr, data);
|
|
break;
|
|
case PCI_SEL_BASE:
|
|
s->hotplug_select = s->legacy_piix ? ACPI_PCIHP_BSEL_DEFAULT : data;
|
|
trace_acpi_pci_sel_write(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(Object *owner, AcpiPciHpState *s, PCIBus *root_bus,
|
|
MemoryRegion *address_space_io, bool bridges_enabled)
|
|
{
|
|
s->io_len = ACPI_PCIHP_SIZE;
|
|
s->io_base = ACPI_PCIHP_ADDR;
|
|
|
|
s->root = root_bus;
|
|
s->legacy_piix = !bridges_enabled;
|
|
|
|
memory_region_init_io(&s->io, owner, &acpi_pcihp_io_ops, s,
|
|
"acpi-pci-hotplug", s->io_len);
|
|
memory_region_add_subregion(address_space_io, s->io_base, &s->io);
|
|
|
|
object_property_add_uint16_ptr(owner, ACPI_PCIHP_IO_BASE_PROP, &s->io_base,
|
|
OBJ_PROP_FLAG_READ);
|
|
object_property_add_uint16_ptr(owner, ACPI_PCIHP_IO_LEN_PROP, &s->io_len,
|
|
OBJ_PROP_FLAG_READ);
|
|
}
|
|
|
|
bool vmstate_acpi_pcihp_use_acpi_index(void *opaque, int version_id)
|
|
{
|
|
AcpiPciHpState *s = opaque;
|
|
return s->acpi_index;
|
|
}
|
|
|
|
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()
|
|
}
|
|
};
|