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qemu/hw/pci/pci.c
Markus Armbruster b69c3c21a5 qdev: Unrealize must not fail 
Devices may have component devices and buses.

Device realization may fail.  Realization is recursive: a device's
realize() method realizes its components, and device_set_realized()
realizes its buses (which should in turn realize the devices on that
bus, except bus_set_realized() doesn't implement that, yet).

When realization of a component or bus fails, we need to roll back:
unrealize everything we realized so far.  If any of these unrealizes
failed, the device would be left in an inconsistent state.  Must not
happen.

device_set_realized() lets it happen: it ignores errors in the roll
back code starting at label child_realize_fail.

Since realization is recursive, unrealization must be recursive, too.
But how could a partly failed unrealize be rolled back?  We'd have to
re-realize, which can fail.  This design is fundamentally broken.

device_set_realized() does not roll back at all.  Instead, it keeps
unrealizing, ignoring further errors.

It can screw up even for a device with no buses: if the lone
dc->unrealize() fails, it still unregisters vmstate, and calls
listeners' unrealize() callback.

bus_set_realized() does not roll back either.  Instead, it stops
unrealizing.

Fortunately, no unrealize method can fail, as we'll see below.

To fix the design error, drop parameter @errp from all the unrealize
methods.

Any unrealize method that uses @errp now needs an update.  This leads
us to unrealize() methods that can fail.  Merely passing it to another
unrealize method cannot cause failure, though.  Here are the ones that
do other things with @errp:

* virtio_serial_device_unrealize()

  Fails when qbus_set_hotplug_handler() fails, but still does all the
  other work.  On failure, the device would stay realized with its
  resources completely gone.  Oops.  Can't happen, because
  qbus_set_hotplug_handler() can't actually fail here.  Pass
  &error_abort to qbus_set_hotplug_handler() instead.

* hw/ppc/spapr_drc.c's unrealize()

  Fails when object_property_del() fails, but all the other work is
  already done.  On failure, the device would stay realized with its
  vmstate registration gone.  Oops.  Can't happen, because
  object_property_del() can't actually fail here.  Pass &error_abort
  to object_property_del() instead.

* spapr_phb_unrealize()

  Fails and bails out when remove_drcs() fails, but other work is
  already done.  On failure, the device would stay realized with some
  of its resources gone.  Oops.  remove_drcs() fails only when
  chassis_from_bus()'s object_property_get_uint() fails, and it can't
  here.  Pass &error_abort to remove_drcs() instead.

Therefore, no unrealize method can fail before this patch.

device_set_realized()'s recursive unrealization via bus uses
object_property_set_bool().  Can't drop @errp there, so pass
&error_abort.

We similarly unrealize with object_property_set_bool() elsewhere,
always ignoring errors.  Pass &error_abort instead.

Several unrealize methods no longer handle errors from other unrealize
methods: virtio_9p_device_unrealize(),
virtio_input_device_unrealize(), scsi_qdev_unrealize(), ...
Much of the deleted error handling looks wrong anyway.

One unrealize methods no longer ignore such errors:
usb_ehci_pci_exit().

Several realize methods no longer ignore errors when rolling back:
v9fs_device_realize_common(), pci_qdev_unrealize(),
spapr_phb_realize(), usb_qdev_realize(), vfio_ccw_realize(),
virtio_device_realize().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200505152926.18877-17-armbru@redhat.com>
2020-05-15 07:08:14 +02:00

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/*
* QEMU PCI bus manager
*
* Copyright (c) 2004 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "hw/irq.h"
#include "hw/pci/pci.h"
#include "hw/pci/pci_bridge.h"
#include "hw/pci/pci_bus.h"
#include "hw/pci/pci_host.h"
#include "hw/qdev-properties.h"
#include "migration/qemu-file-types.h"
#include "migration/vmstate.h"
#include "monitor/monitor.h"
#include "net/net.h"
#include "sysemu/numa.h"
#include "sysemu/sysemu.h"
#include "hw/loader.h"
#include "qemu/error-report.h"
#include "qemu/range.h"
#include "trace.h"
#include "hw/pci/msi.h"
#include "hw/pci/msix.h"
#include "exec/address-spaces.h"
#include "hw/hotplug.h"
#include "hw/boards.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-misc.h"
#include "qemu/cutils.h"
//#define DEBUG_PCI
#ifdef DEBUG_PCI
# define PCI_DPRINTF(format, ...) printf(format, ## __VA_ARGS__)
#else
# define PCI_DPRINTF(format, ...) do { } while (0)
#endif
bool pci_available = true;
static void pcibus_dev_print(Monitor *mon, DeviceState *dev, int indent);
static char *pcibus_get_dev_path(DeviceState *dev);
static char *pcibus_get_fw_dev_path(DeviceState *dev);
static void pcibus_reset(BusState *qbus);
static Property pci_props[] = {
DEFINE_PROP_PCI_DEVFN("addr", PCIDevice, devfn, -1),
DEFINE_PROP_STRING("romfile", PCIDevice, romfile),
DEFINE_PROP_UINT32("rombar", PCIDevice, rom_bar, 1),
DEFINE_PROP_BIT("multifunction", PCIDevice, cap_present,
QEMU_PCI_CAP_MULTIFUNCTION_BITNR, false),
DEFINE_PROP_BIT("x-pcie-lnksta-dllla", PCIDevice, cap_present,
QEMU_PCIE_LNKSTA_DLLLA_BITNR, true),
DEFINE_PROP_BIT("x-pcie-extcap-init", PCIDevice, cap_present,
QEMU_PCIE_EXTCAP_INIT_BITNR, true),
DEFINE_PROP_STRING("failover_pair_id", PCIDevice,
failover_pair_id),
DEFINE_PROP_END_OF_LIST()
};
static const VMStateDescription vmstate_pcibus = {
.name = "PCIBUS",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_INT32_EQUAL(nirq, PCIBus, NULL),
VMSTATE_VARRAY_INT32(irq_count, PCIBus,
nirq, 0, vmstate_info_int32,
int32_t),
VMSTATE_END_OF_LIST()
}
};
static void pci_init_bus_master(PCIDevice *pci_dev)
{
AddressSpace *dma_as = pci_device_iommu_address_space(pci_dev);
memory_region_init_alias(&pci_dev->bus_master_enable_region,
OBJECT(pci_dev), "bus master",
dma_as->root, 0, memory_region_size(dma_as->root));
memory_region_set_enabled(&pci_dev->bus_master_enable_region, false);
memory_region_add_subregion(&pci_dev->bus_master_container_region, 0,
&pci_dev->bus_master_enable_region);
}
static void pcibus_machine_done(Notifier *notifier, void *data)
{
PCIBus *bus = container_of(notifier, PCIBus, machine_done);
int i;
for (i = 0; i < ARRAY_SIZE(bus->devices); ++i) {
if (bus->devices[i]) {
pci_init_bus_master(bus->devices[i]);
}
}
}
static void pci_bus_realize(BusState *qbus, Error **errp)
{
PCIBus *bus = PCI_BUS(qbus);
bus->machine_done.notify = pcibus_machine_done;
qemu_add_machine_init_done_notifier(&bus->machine_done);
vmstate_register(NULL, VMSTATE_INSTANCE_ID_ANY, &vmstate_pcibus, bus);
}
static void pcie_bus_realize(BusState *qbus, Error **errp)
{
PCIBus *bus = PCI_BUS(qbus);
pci_bus_realize(qbus, errp);
/*
* A PCI-E bus can support extended config space if it's the root
* bus, or if the bus/bridge above it does as well
*/
if (pci_bus_is_root(bus)) {
bus->flags |= PCI_BUS_EXTENDED_CONFIG_SPACE;
} else {
PCIBus *parent_bus = pci_get_bus(bus->parent_dev);
if (pci_bus_allows_extended_config_space(parent_bus)) {
bus->flags |= PCI_BUS_EXTENDED_CONFIG_SPACE;
}
}
}
static void pci_bus_unrealize(BusState *qbus)
{
PCIBus *bus = PCI_BUS(qbus);
qemu_remove_machine_init_done_notifier(&bus->machine_done);
vmstate_unregister(NULL, &vmstate_pcibus, bus);
}
static int pcibus_num(PCIBus *bus)
{
if (pci_bus_is_root(bus)) {
return 0; /* pci host bridge */
}
return bus->parent_dev->config[PCI_SECONDARY_BUS];
}
static uint16_t pcibus_numa_node(PCIBus *bus)
{
return NUMA_NODE_UNASSIGNED;
}
static void pci_bus_class_init(ObjectClass *klass, void *data)
{
BusClass *k = BUS_CLASS(klass);
PCIBusClass *pbc = PCI_BUS_CLASS(klass);
k->print_dev = pcibus_dev_print;
k->get_dev_path = pcibus_get_dev_path;
k->get_fw_dev_path = pcibus_get_fw_dev_path;
k->realize = pci_bus_realize;
k->unrealize = pci_bus_unrealize;
k->reset = pcibus_reset;
pbc->bus_num = pcibus_num;
pbc->numa_node = pcibus_numa_node;
}
static const TypeInfo pci_bus_info = {
.name = TYPE_PCI_BUS,
.parent = TYPE_BUS,
.instance_size = sizeof(PCIBus),
.class_size = sizeof(PCIBusClass),
.class_init = pci_bus_class_init,
};
static const TypeInfo pcie_interface_info = {
.name = INTERFACE_PCIE_DEVICE,
.parent = TYPE_INTERFACE,
};
static const TypeInfo conventional_pci_interface_info = {
.name = INTERFACE_CONVENTIONAL_PCI_DEVICE,
.parent = TYPE_INTERFACE,
};
static void pcie_bus_class_init(ObjectClass *klass, void *data)
{
BusClass *k = BUS_CLASS(klass);
k->realize = pcie_bus_realize;
}
static const TypeInfo pcie_bus_info = {
.name = TYPE_PCIE_BUS,
.parent = TYPE_PCI_BUS,
.class_init = pcie_bus_class_init,
};
static PCIBus *pci_find_bus_nr(PCIBus *bus, int bus_num);
static void pci_update_mappings(PCIDevice *d);
static void pci_irq_handler(void *opaque, int irq_num, int level);
static void pci_add_option_rom(PCIDevice *pdev, bool is_default_rom, Error **);
static void pci_del_option_rom(PCIDevice *pdev);
static uint16_t pci_default_sub_vendor_id = PCI_SUBVENDOR_ID_REDHAT_QUMRANET;
static uint16_t pci_default_sub_device_id = PCI_SUBDEVICE_ID_QEMU;
static QLIST_HEAD(, PCIHostState) pci_host_bridges;
int pci_bar(PCIDevice *d, int reg)
{
uint8_t type;
if (reg != PCI_ROM_SLOT)
return PCI_BASE_ADDRESS_0 + reg * 4;
type = d->config[PCI_HEADER_TYPE] & ~PCI_HEADER_TYPE_MULTI_FUNCTION;
return type == PCI_HEADER_TYPE_BRIDGE ? PCI_ROM_ADDRESS1 : PCI_ROM_ADDRESS;
}
static inline int pci_irq_state(PCIDevice *d, int irq_num)
{
return (d->irq_state >> irq_num) & 0x1;
}
static inline void pci_set_irq_state(PCIDevice *d, int irq_num, int level)
{
d->irq_state &= ~(0x1 << irq_num);
d->irq_state |= level << irq_num;
}
static void pci_change_irq_level(PCIDevice *pci_dev, int irq_num, int change)
{
PCIBus *bus;
for (;;) {
bus = pci_get_bus(pci_dev);
irq_num = bus->map_irq(pci_dev, irq_num);
if (bus->set_irq)
break;
pci_dev = bus->parent_dev;
}
bus->irq_count[irq_num] += change;
bus->set_irq(bus->irq_opaque, irq_num, bus->irq_count[irq_num] != 0);
}
int pci_bus_get_irq_level(PCIBus *bus, int irq_num)
{
assert(irq_num >= 0);
assert(irq_num < bus->nirq);
return !!bus->irq_count[irq_num];
}
/* Update interrupt status bit in config space on interrupt
* state change. */
static void pci_update_irq_status(PCIDevice *dev)
{
if (dev->irq_state) {
dev->config[PCI_STATUS] |= PCI_STATUS_INTERRUPT;
} else {
dev->config[PCI_STATUS] &= ~PCI_STATUS_INTERRUPT;
}
}
void pci_device_deassert_intx(PCIDevice *dev)
{
int i;
for (i = 0; i < PCI_NUM_PINS; ++i) {
pci_irq_handler(dev, i, 0);
}
}
static void pci_do_device_reset(PCIDevice *dev)
{
int r;
pci_device_deassert_intx(dev);
assert(dev->irq_state == 0);
/* Clear all writable bits */
pci_word_test_and_clear_mask(dev->config + PCI_COMMAND,
pci_get_word(dev->wmask + PCI_COMMAND) |
pci_get_word(dev->w1cmask + PCI_COMMAND));
pci_word_test_and_clear_mask(dev->config + PCI_STATUS,
pci_get_word(dev->wmask + PCI_STATUS) |
pci_get_word(dev->w1cmask + PCI_STATUS));
/* Some devices make bits of PCI_INTERRUPT_LINE read only */
pci_byte_test_and_clear_mask(dev->config + PCI_INTERRUPT_LINE,
pci_get_word(dev->wmask + PCI_INTERRUPT_LINE) |
pci_get_word(dev->w1cmask + PCI_INTERRUPT_LINE));
dev->config[PCI_CACHE_LINE_SIZE] = 0x0;
for (r = 0; r < PCI_NUM_REGIONS; ++r) {
PCIIORegion *region = &dev->io_regions[r];
if (!region->size) {
continue;
}
if (!(region->type & PCI_BASE_ADDRESS_SPACE_IO) &&
region->type & PCI_BASE_ADDRESS_MEM_TYPE_64) {
pci_set_quad(dev->config + pci_bar(dev, r), region->type);
} else {
pci_set_long(dev->config + pci_bar(dev, r), region->type);
}
}
pci_update_mappings(dev);
msi_reset(dev);
msix_reset(dev);
}
/*
* This function is called on #RST and FLR.
* FLR if PCI_EXP_DEVCTL_BCR_FLR is set
*/
void pci_device_reset(PCIDevice *dev)
{
qdev_reset_all(&dev->qdev);
pci_do_device_reset(dev);
}
/*
* Trigger pci bus reset under a given bus.
* Called via qbus_reset_all on RST# assert, after the devices
* have been reset qdev_reset_all-ed already.
*/
static void pcibus_reset(BusState *qbus)
{
PCIBus *bus = DO_UPCAST(PCIBus, qbus, qbus);
int i;
for (i = 0; i < ARRAY_SIZE(bus->devices); ++i) {
if (bus->devices[i]) {
pci_do_device_reset(bus->devices[i]);
}
}
for (i = 0; i < bus->nirq; i++) {
assert(bus->irq_count[i] == 0);
}
}
static void pci_host_bus_register(DeviceState *host)
{
PCIHostState *host_bridge = PCI_HOST_BRIDGE(host);
QLIST_INSERT_HEAD(&pci_host_bridges, host_bridge, next);
}
static void pci_host_bus_unregister(DeviceState *host)
{
PCIHostState *host_bridge = PCI_HOST_BRIDGE(host);
QLIST_REMOVE(host_bridge, next);
}
PCIBus *pci_device_root_bus(const PCIDevice *d)
{
PCIBus *bus = pci_get_bus(d);
while (!pci_bus_is_root(bus)) {
d = bus->parent_dev;
assert(d != NULL);
bus = pci_get_bus(d);
}
return bus;
}
const char *pci_root_bus_path(PCIDevice *dev)
{
PCIBus *rootbus = pci_device_root_bus(dev);
PCIHostState *host_bridge = PCI_HOST_BRIDGE(rootbus->qbus.parent);
PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_GET_CLASS(host_bridge);
assert(host_bridge->bus == rootbus);
if (hc->root_bus_path) {
return (*hc->root_bus_path)(host_bridge, rootbus);
}
return rootbus->qbus.name;
}
static void pci_root_bus_init(PCIBus *bus, DeviceState *parent,
MemoryRegion *address_space_mem,
MemoryRegion *address_space_io,
uint8_t devfn_min)
{
assert(PCI_FUNC(devfn_min) == 0);
bus->devfn_min = devfn_min;
bus->slot_reserved_mask = 0x0;
bus->address_space_mem = address_space_mem;
bus->address_space_io = address_space_io;
bus->flags |= PCI_BUS_IS_ROOT;
/* host bridge */
QLIST_INIT(&bus->child);
pci_host_bus_register(parent);
}
static void pci_bus_uninit(PCIBus *bus)
{
pci_host_bus_unregister(BUS(bus)->parent);
}
bool pci_bus_is_express(PCIBus *bus)
{
return object_dynamic_cast(OBJECT(bus), TYPE_PCIE_BUS);
}
void pci_root_bus_new_inplace(PCIBus *bus, size_t bus_size, DeviceState *parent,
const char *name,
MemoryRegion *address_space_mem,
MemoryRegion *address_space_io,
uint8_t devfn_min, const char *typename)
{
qbus_create_inplace(bus, bus_size, typename, parent, name);
pci_root_bus_init(bus, parent, address_space_mem, address_space_io,
devfn_min);
}
PCIBus *pci_root_bus_new(DeviceState *parent, const char *name,
MemoryRegion *address_space_mem,
MemoryRegion *address_space_io,
uint8_t devfn_min, const char *typename)
{
PCIBus *bus;
bus = PCI_BUS(qbus_create(typename, parent, name));
pci_root_bus_init(bus, parent, address_space_mem, address_space_io,
devfn_min);
return bus;
}
void pci_root_bus_cleanup(PCIBus *bus)
{
pci_bus_uninit(bus);
/* the caller of the unplug hotplug handler will delete this device */
object_property_set_bool(OBJECT(bus), false, "realized", &error_abort);
}
void pci_bus_irqs(PCIBus *bus, pci_set_irq_fn set_irq, pci_map_irq_fn map_irq,
void *irq_opaque, int nirq)
{
bus->set_irq = set_irq;
bus->map_irq = map_irq;
bus->irq_opaque = irq_opaque;
bus->nirq = nirq;
bus->irq_count = g_malloc0(nirq * sizeof(bus->irq_count[0]));
}
void pci_bus_irqs_cleanup(PCIBus *bus)
{
bus->set_irq = NULL;
bus->map_irq = NULL;
bus->irq_opaque = NULL;
bus->nirq = 0;
g_free(bus->irq_count);
}
PCIBus *pci_register_root_bus(DeviceState *parent, const char *name,
pci_set_irq_fn set_irq, pci_map_irq_fn map_irq,
void *irq_opaque,
MemoryRegion *address_space_mem,
MemoryRegion *address_space_io,
uint8_t devfn_min, int nirq,
const char *typename)
{
PCIBus *bus;
bus = pci_root_bus_new(parent, name, address_space_mem,
address_space_io, devfn_min, typename);
pci_bus_irqs(bus, set_irq, map_irq, irq_opaque, nirq);
return bus;
}
void pci_unregister_root_bus(PCIBus *bus)
{
pci_bus_irqs_cleanup(bus);
pci_root_bus_cleanup(bus);
}
int pci_bus_num(PCIBus *s)
{
return PCI_BUS_GET_CLASS(s)->bus_num(s);
}
int pci_bus_numa_node(PCIBus *bus)
{
return PCI_BUS_GET_CLASS(bus)->numa_node(bus);
}
static int get_pci_config_device(QEMUFile *f, void *pv, size_t size,
const VMStateField *field)
{
PCIDevice *s = container_of(pv, PCIDevice, config);
PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(s);
uint8_t *config;
int i;
assert(size == pci_config_size(s));
config = g_malloc(size);
qemu_get_buffer(f, config, size);
for (i = 0; i < size; ++i) {
if ((config[i] ^ s->config[i]) &
s->cmask[i] & ~s->wmask[i] & ~s->w1cmask[i]) {
error_report("%s: Bad config data: i=0x%x read: %x device: %x "
"cmask: %x wmask: %x w1cmask:%x", __func__,
i, config[i], s->config[i],
s->cmask[i], s->wmask[i], s->w1cmask[i]);
g_free(config);
return -EINVAL;
}
}
memcpy(s->config, config, size);
pci_update_mappings(s);
if (pc->is_bridge) {
PCIBridge *b = PCI_BRIDGE(s);
pci_bridge_update_mappings(b);
}
memory_region_set_enabled(&s->bus_master_enable_region,
pci_get_word(s->config + PCI_COMMAND)
& PCI_COMMAND_MASTER);
g_free(config);
return 0;
}
/* just put buffer */
static int put_pci_config_device(QEMUFile *f, void *pv, size_t size,
const VMStateField *field, QJSON *vmdesc)
{
const uint8_t **v = pv;
assert(size == pci_config_size(container_of(pv, PCIDevice, config)));
qemu_put_buffer(f, *v, size);
return 0;
}
static VMStateInfo vmstate_info_pci_config = {
.name = "pci config",
.get = get_pci_config_device,
.put = put_pci_config_device,
};
static int get_pci_irq_state(QEMUFile *f, void *pv, size_t size,
const VMStateField *field)
{
PCIDevice *s = container_of(pv, PCIDevice, irq_state);
uint32_t irq_state[PCI_NUM_PINS];
int i;
for (i = 0; i < PCI_NUM_PINS; ++i) {
irq_state[i] = qemu_get_be32(f);
if (irq_state[i] != 0x1 && irq_state[i] != 0) {
fprintf(stderr, "irq state %d: must be 0 or 1.\n",
irq_state[i]);
return -EINVAL;
}
}
for (i = 0; i < PCI_NUM_PINS; ++i) {
pci_set_irq_state(s, i, irq_state[i]);
}
return 0;
}
static int put_pci_irq_state(QEMUFile *f, void *pv, size_t size,
const VMStateField *field, QJSON *vmdesc)
{
int i;
PCIDevice *s = container_of(pv, PCIDevice, irq_state);
for (i = 0; i < PCI_NUM_PINS; ++i) {
qemu_put_be32(f, pci_irq_state(s, i));
}
return 0;
}
static VMStateInfo vmstate_info_pci_irq_state = {
.name = "pci irq state",
.get = get_pci_irq_state,
.put = put_pci_irq_state,
};
static bool migrate_is_pcie(void *opaque, int version_id)
{
return pci_is_express((PCIDevice *)opaque);
}
static bool migrate_is_not_pcie(void *opaque, int version_id)
{
return !pci_is_express((PCIDevice *)opaque);
}
const VMStateDescription vmstate_pci_device = {
.name = "PCIDevice",
.version_id = 2,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_INT32_POSITIVE_LE(version_id, PCIDevice),
VMSTATE_BUFFER_UNSAFE_INFO_TEST(config, PCIDevice,
migrate_is_not_pcie,
0, vmstate_info_pci_config,
PCI_CONFIG_SPACE_SIZE),
VMSTATE_BUFFER_UNSAFE_INFO_TEST(config, PCIDevice,
migrate_is_pcie,
0, vmstate_info_pci_config,
PCIE_CONFIG_SPACE_SIZE),
VMSTATE_BUFFER_UNSAFE_INFO(irq_state, PCIDevice, 2,
vmstate_info_pci_irq_state,
PCI_NUM_PINS * sizeof(int32_t)),
VMSTATE_END_OF_LIST()
}
};
void pci_device_save(PCIDevice *s, QEMUFile *f)
{
/* Clear interrupt status bit: it is implicit
* in irq_state which we are saving.
* This makes us compatible with old devices
* which never set or clear this bit. */
s->config[PCI_STATUS] &= ~PCI_STATUS_INTERRUPT;
vmstate_save_state(f, &vmstate_pci_device, s, NULL);
/* Restore the interrupt status bit. */
pci_update_irq_status(s);
}
int pci_device_load(PCIDevice *s, QEMUFile *f)
{
int ret;
ret = vmstate_load_state(f, &vmstate_pci_device, s, s->version_id);
/* Restore the interrupt status bit. */
pci_update_irq_status(s);
return ret;
}
static void pci_set_default_subsystem_id(PCIDevice *pci_dev)
{
pci_set_word(pci_dev->config + PCI_SUBSYSTEM_VENDOR_ID,
pci_default_sub_vendor_id);
pci_set_word(pci_dev->config + PCI_SUBSYSTEM_ID,
pci_default_sub_device_id);
}
/*
* Parse [[<domain>:]<bus>:]<slot>, return -1 on error if funcp == NULL
* [[<domain>:]<bus>:]<slot>.<func>, return -1 on error
*/
static int pci_parse_devaddr(const char *addr, int *domp, int *busp,
unsigned int *slotp, unsigned int *funcp)
{
const char *p;
char *e;
unsigned long val;
unsigned long dom = 0, bus = 0;
unsigned int slot = 0;
unsigned int func = 0;
p = addr;
val = strtoul(p, &e, 16);
if (e == p)
return -1;
if (*e == ':') {
bus = val;
p = e + 1;
val = strtoul(p, &e, 16);
if (e == p)
return -1;
if (*e == ':') {
dom = bus;
bus = val;
p = e + 1;
val = strtoul(p, &e, 16);
if (e == p)
return -1;
}
}
slot = val;
if (funcp != NULL) {
if (*e != '.')
return -1;
p = e + 1;
val = strtoul(p, &e, 16);
if (e == p)
return -1;
func = val;
}
/* if funcp == NULL func is 0 */
if (dom > 0xffff || bus > 0xff || slot > 0x1f || func > 7)
return -1;
if (*e)
return -1;
*domp = dom;
*busp = bus;
*slotp = slot;
if (funcp != NULL)
*funcp = func;
return 0;
}
static void pci_init_cmask(PCIDevice *dev)
{
pci_set_word(dev->cmask + PCI_VENDOR_ID, 0xffff);
pci_set_word(dev->cmask + PCI_DEVICE_ID, 0xffff);
dev->cmask[PCI_STATUS] = PCI_STATUS_CAP_LIST;
dev->cmask[PCI_REVISION_ID] = 0xff;
dev->cmask[PCI_CLASS_PROG] = 0xff;
pci_set_word(dev->cmask + PCI_CLASS_DEVICE, 0xffff);
dev->cmask[PCI_HEADER_TYPE] = 0xff;
dev->cmask[PCI_CAPABILITY_LIST] = 0xff;
}
static void pci_init_wmask(PCIDevice *dev)
{
int config_size = pci_config_size(dev);
dev->wmask[PCI_CACHE_LINE_SIZE] = 0xff;
dev->wmask[PCI_INTERRUPT_LINE] = 0xff;
pci_set_word(dev->wmask + PCI_COMMAND,
PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
PCI_COMMAND_INTX_DISABLE);
pci_word_test_and_set_mask(dev->wmask + PCI_COMMAND, PCI_COMMAND_SERR);
memset(dev->wmask + PCI_CONFIG_HEADER_SIZE, 0xff,
config_size - PCI_CONFIG_HEADER_SIZE);
}
static void pci_init_w1cmask(PCIDevice *dev)
{
/*
* Note: It's okay to set w1cmask even for readonly bits as
* long as their value is hardwired to 0.
*/
pci_set_word(dev->w1cmask + PCI_STATUS,
PCI_STATUS_PARITY | PCI_STATUS_SIG_TARGET_ABORT |
PCI_STATUS_REC_TARGET_ABORT | PCI_STATUS_REC_MASTER_ABORT |
PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_DETECTED_PARITY);
}
static void pci_init_mask_bridge(PCIDevice *d)
{
/* PCI_PRIMARY_BUS, PCI_SECONDARY_BUS, PCI_SUBORDINATE_BUS and
PCI_SEC_LETENCY_TIMER */
memset(d->wmask + PCI_PRIMARY_BUS, 0xff, 4);
/* base and limit */
d->wmask[PCI_IO_BASE] = PCI_IO_RANGE_MASK & 0xff;
d->wmask[PCI_IO_LIMIT] = PCI_IO_RANGE_MASK & 0xff;
pci_set_word(d->wmask + PCI_MEMORY_BASE,
PCI_MEMORY_RANGE_MASK & 0xffff);
pci_set_word(d->wmask + PCI_MEMORY_LIMIT,
PCI_MEMORY_RANGE_MASK & 0xffff);
pci_set_word(d->wmask + PCI_PREF_MEMORY_BASE,
PCI_PREF_RANGE_MASK & 0xffff);
pci_set_word(d->wmask + PCI_PREF_MEMORY_LIMIT,
PCI_PREF_RANGE_MASK & 0xffff);
/* PCI_PREF_BASE_UPPER32 and PCI_PREF_LIMIT_UPPER32 */
memset(d->wmask + PCI_PREF_BASE_UPPER32, 0xff, 8);
/* Supported memory and i/o types */
d->config[PCI_IO_BASE] |= PCI_IO_RANGE_TYPE_16;
d->config[PCI_IO_LIMIT] |= PCI_IO_RANGE_TYPE_16;
pci_word_test_and_set_mask(d->config + PCI_PREF_MEMORY_BASE,
PCI_PREF_RANGE_TYPE_64);
pci_word_test_and_set_mask(d->config + PCI_PREF_MEMORY_LIMIT,
PCI_PREF_RANGE_TYPE_64);
/*
* TODO: Bridges default to 10-bit VGA decoding but we currently only
* implement 16-bit decoding (no alias support).
*/
pci_set_word(d->wmask + PCI_BRIDGE_CONTROL,
PCI_BRIDGE_CTL_PARITY |
PCI_BRIDGE_CTL_SERR |
PCI_BRIDGE_CTL_ISA |
PCI_BRIDGE_CTL_VGA |
PCI_BRIDGE_CTL_VGA_16BIT |
PCI_BRIDGE_CTL_MASTER_ABORT |
PCI_BRIDGE_CTL_BUS_RESET |
PCI_BRIDGE_CTL_FAST_BACK |
PCI_BRIDGE_CTL_DISCARD |
PCI_BRIDGE_CTL_SEC_DISCARD |
PCI_BRIDGE_CTL_DISCARD_SERR);
/* Below does not do anything as we never set this bit, put here for
* completeness. */
pci_set_word(d->w1cmask + PCI_BRIDGE_CONTROL,
PCI_BRIDGE_CTL_DISCARD_STATUS);
d->cmask[PCI_IO_BASE] |= PCI_IO_RANGE_TYPE_MASK;
d->cmask[PCI_IO_LIMIT] |= PCI_IO_RANGE_TYPE_MASK;
pci_word_test_and_set_mask(d->cmask + PCI_PREF_MEMORY_BASE,
PCI_PREF_RANGE_TYPE_MASK);
pci_word_test_and_set_mask(d->cmask + PCI_PREF_MEMORY_LIMIT,
PCI_PREF_RANGE_TYPE_MASK);
}
static void pci_init_multifunction(PCIBus *bus, PCIDevice *dev, Error **errp)
{
uint8_t slot = PCI_SLOT(dev->devfn);
uint8_t func;
if (dev->cap_present & QEMU_PCI_CAP_MULTIFUNCTION) {
dev->config[PCI_HEADER_TYPE] |= PCI_HEADER_TYPE_MULTI_FUNCTION;
}
/*
* multifunction bit is interpreted in two ways as follows.
* - all functions must set the bit to 1.
* Example: Intel X53
* - function 0 must set the bit, but the rest function (> 0)
* is allowed to leave the bit to 0.
* Example: PIIX3(also in qemu), PIIX4(also in qemu), ICH10,
*
* So OS (at least Linux) checks the bit of only function 0,
* and doesn't see the bit of function > 0.
*
* The below check allows both interpretation.
*/
if (PCI_FUNC(dev->devfn)) {
PCIDevice *f0 = bus->devices[PCI_DEVFN(slot, 0)];
if (f0 && !(f0->cap_present & QEMU_PCI_CAP_MULTIFUNCTION)) {
/* function 0 should set multifunction bit */
error_setg(errp, "PCI: single function device can't be populated "
"in function %x.%x", slot, PCI_FUNC(dev->devfn));
return;
}
return;
}
if (dev->cap_present & QEMU_PCI_CAP_MULTIFUNCTION) {
return;
}
/* function 0 indicates single function, so function > 0 must be NULL */
for (func = 1; func < PCI_FUNC_MAX; ++func) {
if (bus->devices[PCI_DEVFN(slot, func)]) {
error_setg(errp, "PCI: %x.0 indicates single function, "
"but %x.%x is already populated.",
slot, slot, func);
return;
}
}
}
static void pci_config_alloc(PCIDevice *pci_dev)
{
int config_size = pci_config_size(pci_dev);
pci_dev->config = g_malloc0(config_size);
pci_dev->cmask = g_malloc0(config_size);
pci_dev->wmask = g_malloc0(config_size);
pci_dev->w1cmask = g_malloc0(config_size);
pci_dev->used = g_malloc0(config_size);
}
static void pci_config_free(PCIDevice *pci_dev)
{
g_free(pci_dev->config);
g_free(pci_dev->cmask);
g_free(pci_dev->wmask);
g_free(pci_dev->w1cmask);
g_free(pci_dev->used);
}
static void do_pci_unregister_device(PCIDevice *pci_dev)
{
pci_get_bus(pci_dev)->devices[pci_dev->devfn] = NULL;
pci_config_free(pci_dev);
if (memory_region_is_mapped(&pci_dev->bus_master_enable_region)) {
memory_region_del_subregion(&pci_dev->bus_master_container_region,
&pci_dev->bus_master_enable_region);
}
address_space_destroy(&pci_dev->bus_master_as);
}
/* Extract PCIReqIDCache into BDF format */
static uint16_t pci_req_id_cache_extract(PCIReqIDCache *cache)
{
uint8_t bus_n;
uint16_t result;
switch (cache->type) {
case PCI_REQ_ID_BDF:
result = pci_get_bdf(cache->dev);
break;
case PCI_REQ_ID_SECONDARY_BUS:
bus_n = pci_dev_bus_num(cache->dev);
result = PCI_BUILD_BDF(bus_n, 0);
break;
default:
error_report("Invalid PCI requester ID cache type: %d",
cache->type);
exit(1);
break;
}
return result;
}
/* Parse bridges up to the root complex and return requester ID
* cache for specific device. For full PCIe topology, the cache
* result would be exactly the same as getting BDF of the device.
* However, several tricks are required when system mixed up with
* legacy PCI devices and PCIe-to-PCI bridges.
*
* Here we cache the proxy device (and type) not requester ID since
* bus number might change from time to time.
*/
static PCIReqIDCache pci_req_id_cache_get(PCIDevice *dev)
{
PCIDevice *parent;
PCIReqIDCache cache = {
.dev = dev,
.type = PCI_REQ_ID_BDF,
};
while (!pci_bus_is_root(pci_get_bus(dev))) {
/* We are under PCI/PCIe bridges */
parent = pci_get_bus(dev)->parent_dev;
if (pci_is_express(parent)) {
if (pcie_cap_get_type(parent) == PCI_EXP_TYPE_PCI_BRIDGE) {
/* When we pass through PCIe-to-PCI/PCIX bridges, we
* override the requester ID using secondary bus
* number of parent bridge with zeroed devfn
* (pcie-to-pci bridge spec chap 2.3). */
cache.type = PCI_REQ_ID_SECONDARY_BUS;
cache.dev = dev;
}
} else {
/* Legacy PCI, override requester ID with the bridge's
* BDF upstream. When the root complex connects to
* legacy PCI devices (including buses), it can only
* obtain requester ID info from directly attached
* devices. If devices are attached under bridges, only
* the requester ID of the bridge that is directly
* attached to the root complex can be recognized. */
cache.type = PCI_REQ_ID_BDF;
cache.dev = parent;
}
dev = parent;
}
return cache;
}
uint16_t pci_requester_id(PCIDevice *dev)
{
return pci_req_id_cache_extract(&dev->requester_id_cache);
}
static bool pci_bus_devfn_available(PCIBus *bus, int devfn)
{
return !(bus->devices[devfn]);
}
static bool pci_bus_devfn_reserved(PCIBus *bus, int devfn)
{
return bus->slot_reserved_mask & (1UL << PCI_SLOT(devfn));
}
/* -1 for devfn means auto assign */
static PCIDevice *do_pci_register_device(PCIDevice *pci_dev,
const char *name, int devfn,
Error **errp)
{
PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(pci_dev);
PCIConfigReadFunc *config_read = pc->config_read;
PCIConfigWriteFunc *config_write = pc->config_write;
Error *local_err = NULL;
DeviceState *dev = DEVICE(pci_dev);
PCIBus *bus = pci_get_bus(pci_dev);
/* Only pci bridges can be attached to extra PCI root buses */
if (pci_bus_is_root(bus) && bus->parent_dev && !pc->is_bridge) {
error_setg(errp,
"PCI: Only PCI/PCIe bridges can be plugged into %s",
bus->parent_dev->name);
return NULL;
}
if (devfn < 0) {
for(devfn = bus->devfn_min ; devfn < ARRAY_SIZE(bus->devices);
devfn += PCI_FUNC_MAX) {
if (pci_bus_devfn_available(bus, devfn) &&
!pci_bus_devfn_reserved(bus, devfn)) {
goto found;
}
}
error_setg(errp, "PCI: no slot/function available for %s, all in use "
"or reserved", name);
return NULL;
found: ;
} else if (pci_bus_devfn_reserved(bus, devfn)) {
error_setg(errp, "PCI: slot %d function %d not available for %s,"
" reserved",
PCI_SLOT(devfn), PCI_FUNC(devfn), name);
return NULL;
} else if (!pci_bus_devfn_available(bus, devfn)) {
error_setg(errp, "PCI: slot %d function %d not available for %s,"
" in use by %s",
PCI_SLOT(devfn), PCI_FUNC(devfn), name,
bus->devices[devfn]->name);
return NULL;
} else if (dev->hotplugged &&
pci_get_function_0(pci_dev)) {
error_setg(errp, "PCI: slot %d function 0 already ocuppied by %s,"
" new func %s cannot be exposed to guest.",
PCI_SLOT(pci_get_function_0(pci_dev)->devfn),
pci_get_function_0(pci_dev)->name,
name);
return NULL;
}
pci_dev->devfn = devfn;
pci_dev->requester_id_cache = pci_req_id_cache_get(pci_dev);
pstrcpy(pci_dev->name, sizeof(pci_dev->name), name);
memory_region_init(&pci_dev->bus_master_container_region, OBJECT(pci_dev),
"bus master container", UINT64_MAX);
address_space_init(&pci_dev->bus_master_as,
&pci_dev->bus_master_container_region, pci_dev->name);
if (qdev_hotplug) {
pci_init_bus_master(pci_dev);
}
pci_dev->irq_state = 0;
pci_config_alloc(pci_dev);
pci_config_set_vendor_id(pci_dev->config, pc->vendor_id);
pci_config_set_device_id(pci_dev->config, pc->device_id);
pci_config_set_revision(pci_dev->config, pc->revision);
pci_config_set_class(pci_dev->config, pc->class_id);
if (!pc->is_bridge) {
if (pc->subsystem_vendor_id || pc->subsystem_id) {
pci_set_word(pci_dev->config + PCI_SUBSYSTEM_VENDOR_ID,
pc->subsystem_vendor_id);
pci_set_word(pci_dev->config + PCI_SUBSYSTEM_ID,
pc->subsystem_id);
} else {
pci_set_default_subsystem_id(pci_dev);
}
} else {
/* subsystem_vendor_id/subsystem_id are only for header type 0 */
assert(!pc->subsystem_vendor_id);
assert(!pc->subsystem_id);
}
pci_init_cmask(pci_dev);
pci_init_wmask(pci_dev);
pci_init_w1cmask(pci_dev);
if (pc->is_bridge) {
pci_init_mask_bridge(pci_dev);
}
pci_init_multifunction(bus, pci_dev, &local_err);
if (local_err) {
error_propagate(errp, local_err);
do_pci_unregister_device(pci_dev);
return NULL;
}
if (!config_read)
config_read = pci_default_read_config;
if (!config_write)
config_write = pci_default_write_config;
pci_dev->config_read = config_read;
pci_dev->config_write = config_write;
bus->devices[devfn] = pci_dev;
pci_dev->version_id = 2; /* Current pci device vmstate version */
return pci_dev;
}
static void pci_unregister_io_regions(PCIDevice *pci_dev)
{
PCIIORegion *r;
int i;
for(i = 0; i < PCI_NUM_REGIONS; i++) {
r = &pci_dev->io_regions[i];
if (!r->size || r->addr == PCI_BAR_UNMAPPED)
continue;
memory_region_del_subregion(r->address_space, r->memory);
}
pci_unregister_vga(pci_dev);
}
static void pci_qdev_unrealize(DeviceState *dev)
{
PCIDevice *pci_dev = PCI_DEVICE(dev);
PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(pci_dev);
pci_unregister_io_regions(pci_dev);
pci_del_option_rom(pci_dev);
if (pc->exit) {
pc->exit(pci_dev);
}
pci_device_deassert_intx(pci_dev);
do_pci_unregister_device(pci_dev);
}
void pci_register_bar(PCIDevice *pci_dev, int region_num,
uint8_t type, MemoryRegion *memory)
{
PCIIORegion *r;
uint32_t addr; /* offset in pci config space */
uint64_t wmask;
pcibus_t size = memory_region_size(memory);
assert(region_num >= 0);
assert(region_num < PCI_NUM_REGIONS);
if (size & (size-1)) {
error_report("ERROR: PCI region size must be pow2 "
"type=0x%x, size=0x%"FMT_PCIBUS"", type, size);
exit(1);
}
r = &pci_dev->io_regions[region_num];
r->addr = PCI_BAR_UNMAPPED;
r->size = size;
r->type = type;
r->memory = memory;
r->address_space = type & PCI_BASE_ADDRESS_SPACE_IO
? pci_get_bus(pci_dev)->address_space_io
: pci_get_bus(pci_dev)->address_space_mem;
wmask = ~(size - 1);
if (region_num == PCI_ROM_SLOT) {
/* ROM enable bit is writable */
wmask |= PCI_ROM_ADDRESS_ENABLE;
}
addr = pci_bar(pci_dev, region_num);
pci_set_long(pci_dev->config + addr, type);
if (!(r->type & PCI_BASE_ADDRESS_SPACE_IO) &&
r->type & PCI_BASE_ADDRESS_MEM_TYPE_64) {
pci_set_quad(pci_dev->wmask + addr, wmask);
pci_set_quad(pci_dev->cmask + addr, ~0ULL);
} else {
pci_set_long(pci_dev->wmask + addr, wmask & 0xffffffff);
pci_set_long(pci_dev->cmask + addr, 0xffffffff);
}
}
static void pci_update_vga(PCIDevice *pci_dev)
{
uint16_t cmd;
if (!pci_dev->has_vga) {
return;
}
cmd = pci_get_word(pci_dev->config + PCI_COMMAND);
memory_region_set_enabled(pci_dev->vga_regions[QEMU_PCI_VGA_MEM],
cmd & PCI_COMMAND_MEMORY);
memory_region_set_enabled(pci_dev->vga_regions[QEMU_PCI_VGA_IO_LO],
cmd & PCI_COMMAND_IO);
memory_region_set_enabled(pci_dev->vga_regions[QEMU_PCI_VGA_IO_HI],
cmd & PCI_COMMAND_IO);
}
void pci_register_vga(PCIDevice *pci_dev, MemoryRegion *mem,
MemoryRegion *io_lo, MemoryRegion *io_hi)
{
PCIBus *bus = pci_get_bus(pci_dev);
assert(!pci_dev->has_vga);
assert(memory_region_size(mem) == QEMU_PCI_VGA_MEM_SIZE);
pci_dev->vga_regions[QEMU_PCI_VGA_MEM] = mem;
memory_region_add_subregion_overlap(bus->address_space_mem,
QEMU_PCI_VGA_MEM_BASE, mem, 1);
assert(memory_region_size(io_lo) == QEMU_PCI_VGA_IO_LO_SIZE);
pci_dev->vga_regions[QEMU_PCI_VGA_IO_LO] = io_lo;
memory_region_add_subregion_overlap(bus->address_space_io,
QEMU_PCI_VGA_IO_LO_BASE, io_lo, 1);
assert(memory_region_size(io_hi) == QEMU_PCI_VGA_IO_HI_SIZE);
pci_dev->vga_regions[QEMU_PCI_VGA_IO_HI] = io_hi;
memory_region_add_subregion_overlap(bus->address_space_io,
QEMU_PCI_VGA_IO_HI_BASE, io_hi, 1);
pci_dev->has_vga = true;
pci_update_vga(pci_dev);
}
void pci_unregister_vga(PCIDevice *pci_dev)
{
PCIBus *bus = pci_get_bus(pci_dev);
if (!pci_dev->has_vga) {
return;
}
memory_region_del_subregion(bus->address_space_mem,
pci_dev->vga_regions[QEMU_PCI_VGA_MEM]);
memory_region_del_subregion(bus->address_space_io,
pci_dev->vga_regions[QEMU_PCI_VGA_IO_LO]);
memory_region_del_subregion(bus->address_space_io,
pci_dev->vga_regions[QEMU_PCI_VGA_IO_HI]);
pci_dev->has_vga = false;
}
pcibus_t pci_get_bar_addr(PCIDevice *pci_dev, int region_num)
{
return pci_dev->io_regions[region_num].addr;
}
static pcibus_t pci_bar_address(PCIDevice *d,
int reg, uint8_t type, pcibus_t size)
{
pcibus_t new_addr, last_addr;
int bar = pci_bar(d, reg);
uint16_t cmd = pci_get_word(d->config + PCI_COMMAND);
Object *machine = qdev_get_machine();
ObjectClass *oc = object_get_class(machine);
MachineClass *mc = MACHINE_CLASS(oc);
bool allow_0_address = mc->pci_allow_0_address;
if (type & PCI_BASE_ADDRESS_SPACE_IO) {
if (!(cmd & PCI_COMMAND_IO)) {
return PCI_BAR_UNMAPPED;
}
new_addr = pci_get_long(d->config + bar) & ~(size - 1);
last_addr = new_addr + size - 1;
/* Check if 32 bit BAR wraps around explicitly.
* TODO: make priorities correct and remove this work around.
*/
if (last_addr <= new_addr || last_addr >= UINT32_MAX ||
(!allow_0_address && new_addr == 0)) {
return PCI_BAR_UNMAPPED;
}
return new_addr;
}
if (!(cmd & PCI_COMMAND_MEMORY)) {
return PCI_BAR_UNMAPPED;
}
if (type & PCI_BASE_ADDRESS_MEM_TYPE_64) {
new_addr = pci_get_quad(d->config + bar);
} else {
new_addr = pci_get_long(d->config + bar);
}
/* the ROM slot has a specific enable bit */
if (reg == PCI_ROM_SLOT && !(new_addr & PCI_ROM_ADDRESS_ENABLE)) {
return PCI_BAR_UNMAPPED;
}
new_addr &= ~(size - 1);
last_addr = new_addr + size - 1;
/* NOTE: we do not support wrapping */
/* XXX: as we cannot support really dynamic
mappings, we handle specific values as invalid
mappings. */
if (last_addr <= new_addr || last_addr == PCI_BAR_UNMAPPED ||
(!allow_0_address && new_addr == 0)) {
return PCI_BAR_UNMAPPED;
}
/* Now pcibus_t is 64bit.
* Check if 32 bit BAR wraps around explicitly.
* Without this, PC ide doesn't work well.
* TODO: remove this work around.
*/
if (!(type & PCI_BASE_ADDRESS_MEM_TYPE_64) && last_addr >= UINT32_MAX) {
return PCI_BAR_UNMAPPED;
}
/*
* OS is allowed to set BAR beyond its addressable
* bits. For example, 32 bit OS can set 64bit bar
* to >4G. Check it. TODO: we might need to support
* it in the future for e.g. PAE.
*/
if (last_addr >= HWADDR_MAX) {
return PCI_BAR_UNMAPPED;
}
return new_addr;
}
static void pci_update_mappings(PCIDevice *d)
{
PCIIORegion *r;
int i;
pcibus_t new_addr;
for(i = 0; i < PCI_NUM_REGIONS; i++) {
r = &d->io_regions[i];
/* this region isn't registered */
if (!r->size)
continue;
new_addr = pci_bar_address(d, i, r->type, r->size);
/* This bar isn't changed */
if (new_addr == r->addr)
continue;
/* now do the real mapping */
if (r->addr != PCI_BAR_UNMAPPED) {
trace_pci_update_mappings_del(d, pci_dev_bus_num(d),
PCI_SLOT(d->devfn),
PCI_FUNC(d->devfn),
i, r->addr, r->size);
memory_region_del_subregion(r->address_space, r->memory);
}
r->addr = new_addr;
if (r->addr != PCI_BAR_UNMAPPED) {
trace_pci_update_mappings_add(d, pci_dev_bus_num(d),
PCI_SLOT(d->devfn),
PCI_FUNC(d->devfn),
i, r->addr, r->size);
memory_region_add_subregion_overlap(r->address_space,
r->addr, r->memory, 1);
}
}
pci_update_vga(d);
}
static inline int pci_irq_disabled(PCIDevice *d)
{
return pci_get_word(d->config + PCI_COMMAND) & PCI_COMMAND_INTX_DISABLE;
}
/* Called after interrupt disabled field update in config space,
* assert/deassert interrupts if necessary.
* Gets original interrupt disable bit value (before update). */
static void pci_update_irq_disabled(PCIDevice *d, int was_irq_disabled)
{
int i, disabled = pci_irq_disabled(d);
if (disabled == was_irq_disabled)
return;
for (i = 0; i < PCI_NUM_PINS; ++i) {
int state = pci_irq_state(d, i);
pci_change_irq_level(d, i, disabled ? -state : state);
}
}
uint32_t pci_default_read_config(PCIDevice *d,
uint32_t address, int len)
{
uint32_t val = 0;
if (pci_is_express_downstream_port(d) &&
ranges_overlap(address, len, d->exp.exp_cap + PCI_EXP_LNKSTA, 2)) {
pcie_sync_bridge_lnk(d);
}
memcpy(&val, d->config + address, len);
return le32_to_cpu(val);
}
void pci_default_write_config(PCIDevice *d, uint32_t addr, uint32_t val_in, int l)
{
int i, was_irq_disabled = pci_irq_disabled(d);
uint32_t val = val_in;
for (i = 0; i < l; val >>= 8, ++i) {
uint8_t wmask = d->wmask[addr + i];
uint8_t w1cmask = d->w1cmask[addr + i];
assert(!(wmask & w1cmask));
d->config[addr + i] = (d->config[addr + i] & ~wmask) | (val & wmask);
d->config[addr + i] &= ~(val & w1cmask); /* W1C: Write 1 to Clear */
}
if (ranges_overlap(addr, l, PCI_BASE_ADDRESS_0, 24) ||
ranges_overlap(addr, l, PCI_ROM_ADDRESS, 4) ||
ranges_overlap(addr, l, PCI_ROM_ADDRESS1, 4) ||
range_covers_byte(addr, l, PCI_COMMAND))
pci_update_mappings(d);
if (range_covers_byte(addr, l, PCI_COMMAND)) {
pci_update_irq_disabled(d, was_irq_disabled);
memory_region_set_enabled(&d->bus_master_enable_region,
pci_get_word(d->config + PCI_COMMAND)
& PCI_COMMAND_MASTER);
}
msi_write_config(d, addr, val_in, l);
msix_write_config(d, addr, val_in, l);
}
/***********************************************************/
/* generic PCI irq support */
/* 0 <= irq_num <= 3. level must be 0 or 1 */
static void pci_irq_handler(void *opaque, int irq_num, int level)
{
PCIDevice *pci_dev = opaque;
int change;
change = level - pci_irq_state(pci_dev, irq_num);
if (!change)
return;
pci_set_irq_state(pci_dev, irq_num, level);
pci_update_irq_status(pci_dev);
if (pci_irq_disabled(pci_dev))
return;
pci_change_irq_level(pci_dev, irq_num, change);
}
static inline int pci_intx(PCIDevice *pci_dev)
{
return pci_get_byte(pci_dev->config + PCI_INTERRUPT_PIN) - 1;
}
qemu_irq pci_allocate_irq(PCIDevice *pci_dev)
{
int intx = pci_intx(pci_dev);
return qemu_allocate_irq(pci_irq_handler, pci_dev, intx);
}
void pci_set_irq(PCIDevice *pci_dev, int level)
{
int intx = pci_intx(pci_dev);
pci_irq_handler(pci_dev, intx, level);
}
/* Special hooks used by device assignment */
void pci_bus_set_route_irq_fn(PCIBus *bus, pci_route_irq_fn route_intx_to_irq)
{
assert(pci_bus_is_root(bus));
bus->route_intx_to_irq = route_intx_to_irq;
}
PCIINTxRoute pci_device_route_intx_to_irq(PCIDevice *dev, int pin)
{
PCIBus *bus;
do {
bus = pci_get_bus(dev);
pin = bus->map_irq(dev, pin);
dev = bus->parent_dev;
} while (dev);
if (!bus->route_intx_to_irq) {
error_report("PCI: Bug - unimplemented PCI INTx routing (%s)",
object_get_typename(OBJECT(bus->qbus.parent)));
return (PCIINTxRoute) { PCI_INTX_DISABLED, -1 };
}
return bus->route_intx_to_irq(bus->irq_opaque, pin);
}
bool pci_intx_route_changed(PCIINTxRoute *old, PCIINTxRoute *new)
{
return old->mode != new->mode || old->irq != new->irq;
}
void pci_bus_fire_intx_routing_notifier(PCIBus *bus)
{
PCIDevice *dev;
PCIBus *sec;
int i;
for (i = 0; i < ARRAY_SIZE(bus->devices); ++i) {
dev = bus->devices[i];
if (dev && dev->intx_routing_notifier) {
dev->intx_routing_notifier(dev);
}
}
QLIST_FOREACH(sec, &bus->child, sibling) {
pci_bus_fire_intx_routing_notifier(sec);
}
}
void pci_device_set_intx_routing_notifier(PCIDevice *dev,
PCIINTxRoutingNotifier notifier)
{
dev->intx_routing_notifier = notifier;
}
/*
* PCI-to-PCI bridge specification
* 9.1: Interrupt routing. Table 9-1
*
* the PCI Express Base Specification, Revision 2.1
* 2.2.8.1: INTx interrutp signaling - Rules
* the Implementation Note
* Table 2-20
*/
/*
* 0 <= pin <= 3 0 = INTA, 1 = INTB, 2 = INTC, 3 = INTD
* 0-origin unlike PCI interrupt pin register.
*/
int pci_swizzle_map_irq_fn(PCIDevice *pci_dev, int pin)
{
return pci_swizzle(PCI_SLOT(pci_dev->devfn), pin);
}
/***********************************************************/
/* monitor info on PCI */
typedef struct {
uint16_t class;
const char *desc;
const char *fw_name;
uint16_t fw_ign_bits;
} pci_class_desc;
static const pci_class_desc pci_class_descriptions[] =
{
{ 0x0001, "VGA controller", "display"},
{ 0x0100, "SCSI controller", "scsi"},
{ 0x0101, "IDE controller", "ide"},
{ 0x0102, "Floppy controller", "fdc"},
{ 0x0103, "IPI controller", "ipi"},
{ 0x0104, "RAID controller", "raid"},
{ 0x0106, "SATA controller"},
{ 0x0107, "SAS controller"},
{ 0x0180, "Storage controller"},
{ 0x0200, "Ethernet controller", "ethernet"},
{ 0x0201, "Token Ring controller", "token-ring"},
{ 0x0202, "FDDI controller", "fddi"},
{ 0x0203, "ATM controller", "atm"},
{ 0x0280, "Network controller"},
{ 0x0300, "VGA controller", "display", 0x00ff},
{ 0x0301, "XGA controller"},
{ 0x0302, "3D controller"},
{ 0x0380, "Display controller"},
{ 0x0400, "Video controller", "video"},
{ 0x0401, "Audio controller", "sound"},
{ 0x0402, "Phone"},
{ 0x0403, "Audio controller", "sound"},
{ 0x0480, "Multimedia controller"},
{ 0x0500, "RAM controller", "memory"},
{ 0x0501, "Flash controller", "flash"},
{ 0x0580, "Memory controller"},
{ 0x0600, "Host bridge", "host"},
{ 0x0601, "ISA bridge", "isa"},
{ 0x0602, "EISA bridge", "eisa"},
{ 0x0603, "MC bridge", "mca"},
{ 0x0604, "PCI bridge", "pci-bridge"},
{ 0x0605, "PCMCIA bridge", "pcmcia"},
{ 0x0606, "NUBUS bridge", "nubus"},
{ 0x0607, "CARDBUS bridge", "cardbus"},
{ 0x0608, "RACEWAY bridge"},
{ 0x0680, "Bridge"},
{ 0x0700, "Serial port", "serial"},
{ 0x0701, "Parallel port", "parallel"},
{ 0x0800, "Interrupt controller", "interrupt-controller"},
{ 0x0801, "DMA controller", "dma-controller"},
{ 0x0802, "Timer", "timer"},
{ 0x0803, "RTC", "rtc"},
{ 0x0900, "Keyboard", "keyboard"},
{ 0x0901, "Pen", "pen"},
{ 0x0902, "Mouse", "mouse"},
{ 0x0A00, "Dock station", "dock", 0x00ff},
{ 0x0B00, "i386 cpu", "cpu", 0x00ff},
{ 0x0c00, "Fireware contorller", "fireware"},
{ 0x0c01, "Access bus controller", "access-bus"},
{ 0x0c02, "SSA controller", "ssa"},
{ 0x0c03, "USB controller", "usb"},
{ 0x0c04, "Fibre channel controller", "fibre-channel"},
{ 0x0c05, "SMBus"},
{ 0, NULL}
};
static void pci_for_each_device_under_bus_reverse(PCIBus *bus,
void (*fn)(PCIBus *b,
PCIDevice *d,
void *opaque),
void *opaque)
{
PCIDevice *d;
int devfn;
for (devfn = 0; devfn < ARRAY_SIZE(bus->devices); devfn++) {
d = bus->devices[ARRAY_SIZE(bus->devices) - 1 - devfn];
if (d) {
fn(bus, d, opaque);
}
}
}
void pci_for_each_device_reverse(PCIBus *bus, int bus_num,
void (*fn)(PCIBus *b, PCIDevice *d, void *opaque),
void *opaque)
{
bus = pci_find_bus_nr(bus, bus_num);
if (bus) {
pci_for_each_device_under_bus_reverse(bus, fn, opaque);
}
}
static void pci_for_each_device_under_bus(PCIBus *bus,
void (*fn)(PCIBus *b, PCIDevice *d,
void *opaque),
void *opaque)
{
PCIDevice *d;
int devfn;
for(devfn = 0; devfn < ARRAY_SIZE(bus->devices); devfn++) {
d = bus->devices[devfn];
if (d) {
fn(bus, d, opaque);
}
}
}
void pci_for_each_device(PCIBus *bus, int bus_num,
void (*fn)(PCIBus *b, PCIDevice *d, void *opaque),
void *opaque)
{
bus = pci_find_bus_nr(bus, bus_num);
if (bus) {
pci_for_each_device_under_bus(bus, fn, opaque);
}
}
static const pci_class_desc *get_class_desc(int class)
{
const pci_class_desc *desc;
desc = pci_class_descriptions;
while (desc->desc && class != desc->class) {
desc++;
}
return desc;
}
static PciDeviceInfoList *qmp_query_pci_devices(PCIBus *bus, int bus_num);
static PciMemoryRegionList *qmp_query_pci_regions(const PCIDevice *dev)
{
PciMemoryRegionList *head = NULL, *cur_item = NULL;
int i;
for (i = 0; i < PCI_NUM_REGIONS; i++) {
const PCIIORegion *r = &dev->io_regions[i];
PciMemoryRegionList *region;
if (!r->size) {
continue;
}
region = g_malloc0(sizeof(*region));
region->value = g_malloc0(sizeof(*region->value));
if (r->type & PCI_BASE_ADDRESS_SPACE_IO) {
region->value->type = g_strdup("io");
} else {
region->value->type = g_strdup("memory");
region->value->has_prefetch = true;
region->value->prefetch = !!(r->type & PCI_BASE_ADDRESS_MEM_PREFETCH);
region->value->has_mem_type_64 = true;
region->value->mem_type_64 = !!(r->type & PCI_BASE_ADDRESS_MEM_TYPE_64);
}
region->value->bar = i;
region->value->address = r->addr;
region->value->size = r->size;
/* XXX: waiting for the qapi to support GSList */
if (!cur_item) {
head = cur_item = region;
} else {
cur_item->next = region;
cur_item = region;
}
}
return head;
}
static PciBridgeInfo *qmp_query_pci_bridge(PCIDevice *dev, PCIBus *bus,
int bus_num)
{
PciBridgeInfo *info;
PciMemoryRange *range;
info = g_new0(PciBridgeInfo, 1);
info->bus = g_new0(PciBusInfo, 1);
info->bus->number = dev->config[PCI_PRIMARY_BUS];
info->bus->secondary = dev->config[PCI_SECONDARY_BUS];
info->bus->subordinate = dev->config[PCI_SUBORDINATE_BUS];
range = info->bus->io_range = g_new0(PciMemoryRange, 1);
range->base = pci_bridge_get_base(dev, PCI_BASE_ADDRESS_SPACE_IO);
range->limit = pci_bridge_get_limit(dev, PCI_BASE_ADDRESS_SPACE_IO);
range = info->bus->memory_range = g_new0(PciMemoryRange, 1);
range->base = pci_bridge_get_base(dev, PCI_BASE_ADDRESS_SPACE_MEMORY);
range->limit = pci_bridge_get_limit(dev, PCI_BASE_ADDRESS_SPACE_MEMORY);
range = info->bus->prefetchable_range = g_new0(PciMemoryRange, 1);
range->base = pci_bridge_get_base(dev, PCI_BASE_ADDRESS_MEM_PREFETCH);
range->limit = pci_bridge_get_limit(dev, PCI_BASE_ADDRESS_MEM_PREFETCH);
if (dev->config[PCI_SECONDARY_BUS] != 0) {
PCIBus *child_bus = pci_find_bus_nr(bus, dev->config[PCI_SECONDARY_BUS]);
if (child_bus) {
info->has_devices = true;
info->devices = qmp_query_pci_devices(child_bus, dev->config[PCI_SECONDARY_BUS]);
}
}
return info;
}
static PciDeviceInfo *qmp_query_pci_device(PCIDevice *dev, PCIBus *bus,
int bus_num)
{
const pci_class_desc *desc;
PciDeviceInfo *info;
uint8_t type;
int class;
info = g_new0(PciDeviceInfo, 1);
info->bus = bus_num;
info->slot = PCI_SLOT(dev->devfn);
info->function = PCI_FUNC(dev->devfn);
info->class_info = g_new0(PciDeviceClass, 1);
class = pci_get_word(dev->config + PCI_CLASS_DEVICE);
info->class_info->q_class = class;
desc = get_class_desc(class);
if (desc->desc) {
info->class_info->has_desc = true;
info->class_info->desc = g_strdup(desc->desc);
}
info->id = g_new0(PciDeviceId, 1);
info->id->vendor = pci_get_word(dev->config + PCI_VENDOR_ID);
info->id->device = pci_get_word(dev->config + PCI_DEVICE_ID);
info->regions = qmp_query_pci_regions(dev);
info->qdev_id = g_strdup(dev->qdev.id ? dev->qdev.id : "");
if (dev->config[PCI_INTERRUPT_PIN] != 0) {
info->has_irq = true;
info->irq = dev->config[PCI_INTERRUPT_LINE];
}
type = dev->config[PCI_HEADER_TYPE] & ~PCI_HEADER_TYPE_MULTI_FUNCTION;
if (type == PCI_HEADER_TYPE_BRIDGE) {
info->has_pci_bridge = true;
info->pci_bridge = qmp_query_pci_bridge(dev, bus, bus_num);
} else if (type == PCI_HEADER_TYPE_NORMAL) {
info->id->has_subsystem = info->id->has_subsystem_vendor = true;
info->id->subsystem = pci_get_word(dev->config + PCI_SUBSYSTEM_ID);
info->id->subsystem_vendor =
pci_get_word(dev->config + PCI_SUBSYSTEM_VENDOR_ID);
} else if (type == PCI_HEADER_TYPE_CARDBUS) {
info->id->has_subsystem = info->id->has_subsystem_vendor = true;
info->id->subsystem = pci_get_word(dev->config + PCI_CB_SUBSYSTEM_ID);
info->id->subsystem_vendor =
pci_get_word(dev->config + PCI_CB_SUBSYSTEM_VENDOR_ID);
}
return info;
}
static PciDeviceInfoList *qmp_query_pci_devices(PCIBus *bus, int bus_num)
{
PciDeviceInfoList *info, *head = NULL, *cur_item = NULL;
PCIDevice *dev;
int devfn;
for (devfn = 0; devfn < ARRAY_SIZE(bus->devices); devfn++) {
dev = bus->devices[devfn];
if (dev) {
info = g_malloc0(sizeof(*info));
info->value = qmp_query_pci_device(dev, bus, bus_num);
/* XXX: waiting for the qapi to support GSList */
if (!cur_item) {
head = cur_item = info;
} else {
cur_item->next = info;
cur_item = info;
}
}
}
return head;
}
static PciInfo *qmp_query_pci_bus(PCIBus *bus, int bus_num)
{
PciInfo *info = NULL;
bus = pci_find_bus_nr(bus, bus_num);
if (bus) {
info = g_malloc0(sizeof(*info));
info->bus = bus_num;
info->devices = qmp_query_pci_devices(bus, bus_num);
}
return info;
}
PciInfoList *qmp_query_pci(Error **errp)
{
PciInfoList *info, *head = NULL, *cur_item = NULL;
PCIHostState *host_bridge;
QLIST_FOREACH(host_bridge, &pci_host_bridges, next) {
info = g_malloc0(sizeof(*info));
info->value = qmp_query_pci_bus(host_bridge->bus,
pci_bus_num(host_bridge->bus));
/* XXX: waiting for the qapi to support GSList */
if (!cur_item) {
head = cur_item = info;
} else {
cur_item->next = info;
cur_item = info;
}
}
return head;
}
/* Initialize a PCI NIC. */
PCIDevice *pci_nic_init_nofail(NICInfo *nd, PCIBus *rootbus,
const char *default_model,
const char *default_devaddr)
{
const char *devaddr = nd->devaddr ? nd->devaddr : default_devaddr;
GSList *list;
GPtrArray *pci_nic_models;
PCIBus *bus;
PCIDevice *pci_dev;
DeviceState *dev;
int devfn;
int i;
int dom, busnr;
unsigned slot;
if (nd->model && !strcmp(nd->model, "virtio")) {
g_free(nd->model);
nd->model = g_strdup("virtio-net-pci");
}
list = object_class_get_list_sorted(TYPE_PCI_DEVICE, false);
pci_nic_models = g_ptr_array_new();
while (list) {
DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, list->data,
TYPE_DEVICE);
GSList *next;
if (test_bit(DEVICE_CATEGORY_NETWORK, dc->categories) &&
dc->user_creatable) {
const char *name = object_class_get_name(list->data);
g_ptr_array_add(pci_nic_models, (gpointer)name);
}
next = list->next;
g_slist_free_1(list);
list = next;
}
g_ptr_array_add(pci_nic_models, NULL);
if (qemu_show_nic_models(nd->model, (const char **)pci_nic_models->pdata)) {
exit(0);
}
i = qemu_find_nic_model(nd, (const char **)pci_nic_models->pdata,
default_model);
if (i < 0) {
exit(1);
}
if (!rootbus) {
error_report("No primary PCI bus");
exit(1);
}
assert(!rootbus->parent_dev);
if (!devaddr) {
devfn = -1;
busnr = 0;
} else {
if (pci_parse_devaddr(devaddr, &dom, &busnr, &slot, NULL) < 0) {
error_report("Invalid PCI device address %s for device %s",
devaddr, nd->model);
exit(1);
}
if (dom != 0) {
error_report("No support for non-zero PCI domains");
exit(1);
}
devfn = PCI_DEVFN(slot, 0);
}
bus = pci_find_bus_nr(rootbus, busnr);
if (!bus) {
error_report("Invalid PCI device address %s for device %s",
devaddr, nd->model);
exit(1);
}
pci_dev = pci_create(bus, devfn, nd->model);
dev = &pci_dev->qdev;
qdev_set_nic_properties(dev, nd);
qdev_init_nofail(dev);
g_ptr_array_free(pci_nic_models, true);
return pci_dev;
}
PCIDevice *pci_vga_init(PCIBus *bus)
{
switch (vga_interface_type) {
case VGA_CIRRUS:
return pci_create_simple(bus, -1, "cirrus-vga");
case VGA_QXL:
return pci_create_simple(bus, -1, "qxl-vga");
case VGA_STD:
return pci_create_simple(bus, -1, "VGA");
case VGA_VMWARE:
return pci_create_simple(bus, -1, "vmware-svga");
case VGA_VIRTIO:
return pci_create_simple(bus, -1, "virtio-vga");
case VGA_NONE:
default: /* Other non-PCI types. Checking for unsupported types is already
done in vl.c. */
return NULL;
}
}
/* Whether a given bus number is in range of the secondary
* bus of the given bridge device. */
static bool pci_secondary_bus_in_range(PCIDevice *dev, int bus_num)
{
return !(pci_get_word(dev->config + PCI_BRIDGE_CONTROL) &
PCI_BRIDGE_CTL_BUS_RESET) /* Don't walk the bus if it's reset. */ &&
dev->config[PCI_SECONDARY_BUS] <= bus_num &&
bus_num <= dev->config[PCI_SUBORDINATE_BUS];
}
/* Whether a given bus number is in a range of a root bus */
static bool pci_root_bus_in_range(PCIBus *bus, int bus_num)
{
int i;
for (i = 0; i < ARRAY_SIZE(bus->devices); ++i) {
PCIDevice *dev = bus->devices[i];
if (dev && PCI_DEVICE_GET_CLASS(dev)->is_bridge) {
if (pci_secondary_bus_in_range(dev, bus_num)) {
return true;
}
}
}
return false;
}
static PCIBus *pci_find_bus_nr(PCIBus *bus, int bus_num)
{
PCIBus *sec;
if (!bus) {
return NULL;
}
if (pci_bus_num(bus) == bus_num) {
return bus;
}
/* Consider all bus numbers in range for the host pci bridge. */
if (!pci_bus_is_root(bus) &&
!pci_secondary_bus_in_range(bus->parent_dev, bus_num)) {
return NULL;
}
/* try child bus */
for (; bus; bus = sec) {
QLIST_FOREACH(sec, &bus->child, sibling) {
if (pci_bus_num(sec) == bus_num) {
return sec;
}
/* PXB buses assumed to be children of bus 0 */
if (pci_bus_is_root(sec)) {
if (pci_root_bus_in_range(sec, bus_num)) {
break;
}
} else {
if (pci_secondary_bus_in_range(sec->parent_dev, bus_num)) {
break;
}
}
}
}
return NULL;
}
void pci_for_each_bus_depth_first(PCIBus *bus,
void *(*begin)(PCIBus *bus, void *parent_state),
void (*end)(PCIBus *bus, void *state),
void *parent_state)
{
PCIBus *sec;
void *state;
if (!bus) {
return;
}
if (begin) {
state = begin(bus, parent_state);
} else {
state = parent_state;
}
QLIST_FOREACH(sec, &bus->child, sibling) {
pci_for_each_bus_depth_first(sec, begin, end, state);
}
if (end) {
end(bus, state);
}
}
PCIDevice *pci_find_device(PCIBus *bus, int bus_num, uint8_t devfn)
{
bus = pci_find_bus_nr(bus, bus_num);
if (!bus)
return NULL;
return bus->devices[devfn];
}
static void pci_qdev_realize(DeviceState *qdev, Error **errp)
{
PCIDevice *pci_dev = (PCIDevice *)qdev;
PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(pci_dev);
ObjectClass *klass = OBJECT_CLASS(pc);
Error *local_err = NULL;
bool is_default_rom;
uint16_t class_id;
/* initialize cap_present for pci_is_express() and pci_config_size(),
* Note that hybrid PCIs are not set automatically and need to manage
* QEMU_PCI_CAP_EXPRESS manually */
if (object_class_dynamic_cast(klass, INTERFACE_PCIE_DEVICE) &&
!object_class_dynamic_cast(klass, INTERFACE_CONVENTIONAL_PCI_DEVICE)) {
pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
}
pci_dev = do_pci_register_device(pci_dev,
object_get_typename(OBJECT(qdev)),
pci_dev->devfn, errp);
if (pci_dev == NULL)
return;
if (pc->realize) {
pc->realize(pci_dev, &local_err);
if (local_err) {
error_propagate(errp, local_err);
do_pci_unregister_device(pci_dev);
return;
}
}
if (pci_dev->failover_pair_id) {
if (!pci_bus_is_express(pci_get_bus(pci_dev))) {
error_setg(errp, "failover primary device must be on "
"PCIExpress bus");
error_propagate(errp, local_err);
pci_qdev_unrealize(DEVICE(pci_dev));
return;
}
class_id = pci_get_word(pci_dev->config + PCI_CLASS_DEVICE);
if (class_id != PCI_CLASS_NETWORK_ETHERNET) {
error_setg(errp, "failover primary device is not an "
"Ethernet device");
error_propagate(errp, local_err);
pci_qdev_unrealize(DEVICE(pci_dev));
return;
}
if (!(pci_dev->cap_present & QEMU_PCI_CAP_MULTIFUNCTION)
&& (PCI_FUNC(pci_dev->devfn) == 0)) {
qdev->allow_unplug_during_migration = true;
} else {
error_setg(errp, "failover: primary device must be in its own "
"PCI slot");
error_propagate(errp, local_err);
pci_qdev_unrealize(DEVICE(pci_dev));
return;
}
qdev->allow_unplug_during_migration = true;
}
/* rom loading */
is_default_rom = false;
if (pci_dev->romfile == NULL && pc->romfile != NULL) {
pci_dev->romfile = g_strdup(pc->romfile);
is_default_rom = true;
}
pci_add_option_rom(pci_dev, is_default_rom, &local_err);
if (local_err) {
error_propagate(errp, local_err);
pci_qdev_unrealize(DEVICE(pci_dev));
return;
}
}
PCIDevice *pci_create_multifunction(PCIBus *bus, int devfn, bool multifunction,
const char *name)
{
DeviceState *dev;
dev = qdev_create(&bus->qbus, name);
qdev_prop_set_int32(dev, "addr", devfn);
qdev_prop_set_bit(dev, "multifunction", multifunction);
return PCI_DEVICE(dev);
}
PCIDevice *pci_create_simple_multifunction(PCIBus *bus, int devfn,
bool multifunction,
const char *name)
{
PCIDevice *dev = pci_create_multifunction(bus, devfn, multifunction, name);
qdev_init_nofail(&dev->qdev);
return dev;
}
PCIDevice *pci_create(PCIBus *bus, int devfn, const char *name)
{
return pci_create_multifunction(bus, devfn, false, name);
}
PCIDevice *pci_create_simple(PCIBus *bus, int devfn, const char *name)
{
return pci_create_simple_multifunction(bus, devfn, false, name);
}
static uint8_t pci_find_space(PCIDevice *pdev, uint8_t size)
{
int offset = PCI_CONFIG_HEADER_SIZE;
int i;
for (i = PCI_CONFIG_HEADER_SIZE; i < PCI_CONFIG_SPACE_SIZE; ++i) {
if (pdev->used[i])
offset = i + 1;
else if (i - offset + 1 == size)
return offset;
}
return 0;
}
static uint8_t pci_find_capability_list(PCIDevice *pdev, uint8_t cap_id,
uint8_t *prev_p)
{
uint8_t next, prev;
if (!(pdev->config[PCI_STATUS] & PCI_STATUS_CAP_LIST))
return 0;
for (prev = PCI_CAPABILITY_LIST; (next = pdev->config[prev]);
prev = next + PCI_CAP_LIST_NEXT)
if (pdev->config[next + PCI_CAP_LIST_ID] == cap_id)
break;
if (prev_p)
*prev_p = prev;
return next;
}
static uint8_t pci_find_capability_at_offset(PCIDevice *pdev, uint8_t offset)
{
uint8_t next, prev, found = 0;
if (!(pdev->used[offset])) {
return 0;
}
assert(pdev->config[PCI_STATUS] & PCI_STATUS_CAP_LIST);
for (prev = PCI_CAPABILITY_LIST; (next = pdev->config[prev]);
prev = next + PCI_CAP_LIST_NEXT) {
if (next <= offset && next > found) {
found = next;
}
}
return found;
}
/* Patch the PCI vendor and device ids in a PCI rom image if necessary.
This is needed for an option rom which is used for more than one device. */
static void pci_patch_ids(PCIDevice *pdev, uint8_t *ptr, int size)
{
uint16_t vendor_id;
uint16_t device_id;
uint16_t rom_vendor_id;
uint16_t rom_device_id;
uint16_t rom_magic;
uint16_t pcir_offset;
uint8_t checksum;
/* Words in rom data are little endian (like in PCI configuration),
so they can be read / written with pci_get_word / pci_set_word. */
/* Only a valid rom will be patched. */
rom_magic = pci_get_word(ptr);
if (rom_magic != 0xaa55) {
PCI_DPRINTF("Bad ROM magic %04x\n", rom_magic);
return;
}
pcir_offset = pci_get_word(ptr + 0x18);
if (pcir_offset + 8 >= size || memcmp(ptr + pcir_offset, "PCIR", 4)) {
PCI_DPRINTF("Bad PCIR offset 0x%x or signature\n", pcir_offset);
return;
}
vendor_id = pci_get_word(pdev->config + PCI_VENDOR_ID);
device_id = pci_get_word(pdev->config + PCI_DEVICE_ID);
rom_vendor_id = pci_get_word(ptr + pcir_offset + 4);
rom_device_id = pci_get_word(ptr + pcir_offset + 6);
PCI_DPRINTF("%s: ROM id %04x%04x / PCI id %04x%04x\n", pdev->romfile,
vendor_id, device_id, rom_vendor_id, rom_device_id);
checksum = ptr[6];
if (vendor_id != rom_vendor_id) {
/* Patch vendor id and checksum (at offset 6 for etherboot roms). */
checksum += (uint8_t)rom_vendor_id + (uint8_t)(rom_vendor_id >> 8);
checksum -= (uint8_t)vendor_id + (uint8_t)(vendor_id >> 8);
PCI_DPRINTF("ROM checksum %02x / %02x\n", ptr[6], checksum);
ptr[6] = checksum;
pci_set_word(ptr + pcir_offset + 4, vendor_id);
}
if (device_id != rom_device_id) {
/* Patch device id and checksum (at offset 6 for etherboot roms). */
checksum += (uint8_t)rom_device_id + (uint8_t)(rom_device_id >> 8);
checksum -= (uint8_t)device_id + (uint8_t)(device_id >> 8);
PCI_DPRINTF("ROM checksum %02x / %02x\n", ptr[6], checksum);
ptr[6] = checksum;
pci_set_word(ptr + pcir_offset + 6, device_id);
}
}
/* Add an option rom for the device */
static void pci_add_option_rom(PCIDevice *pdev, bool is_default_rom,
Error **errp)
{
int size;
char *path;
void *ptr;
char name[32];
const VMStateDescription *vmsd;
if (!pdev->romfile)
return;
if (strlen(pdev->romfile) == 0)
return;
if (!pdev->rom_bar) {
/*
* Load rom via fw_cfg instead of creating a rom bar,
* for 0.11 compatibility.
*/
int class = pci_get_word(pdev->config + PCI_CLASS_DEVICE);
/*
* Hot-plugged devices can't use the option ROM
* if the rom bar is disabled.
*/
if (DEVICE(pdev)->hotplugged) {
error_setg(errp, "Hot-plugged device without ROM bar"
" can't have an option ROM");
return;
}
if (class == 0x0300) {
rom_add_vga(pdev->romfile);
} else {
rom_add_option(pdev->romfile, -1);
}
return;
}
path = qemu_find_file(QEMU_FILE_TYPE_BIOS, pdev->romfile);
if (path == NULL) {
path = g_strdup(pdev->romfile);
}
size = get_image_size(path);
if (size < 0) {
error_setg(errp, "failed to find romfile \"%s\"", pdev->romfile);
g_free(path);
return;
} else if (size == 0) {
error_setg(errp, "romfile \"%s\" is empty", pdev->romfile);
g_free(path);
return;
}
size = pow2ceil(size);
vmsd = qdev_get_vmsd(DEVICE(pdev));
if (vmsd) {
snprintf(name, sizeof(name), "%s.rom", vmsd->name);
} else {
snprintf(name, sizeof(name), "%s.rom", object_get_typename(OBJECT(pdev)));
}
pdev->has_rom = true;
memory_region_init_rom(&pdev->rom, OBJECT(pdev), name, size, &error_fatal);
ptr = memory_region_get_ram_ptr(&pdev->rom);
if (load_image_size(path, ptr, size) < 0) {
error_setg(errp, "failed to load romfile \"%s\"", pdev->romfile);
g_free(path);
return;
}
g_free(path);
if (is_default_rom) {
/* Only the default rom images will be patched (if needed). */
pci_patch_ids(pdev, ptr, size);
}
pci_register_bar(pdev, PCI_ROM_SLOT, 0, &pdev->rom);
}
static void pci_del_option_rom(PCIDevice *pdev)
{
if (!pdev->has_rom)
return;
vmstate_unregister_ram(&pdev->rom, &pdev->qdev);
pdev->has_rom = false;
}
/*
* On success, pci_add_capability() returns a positive value
* that the offset of the pci capability.
* On failure, it sets an error and returns a negative error
* code.
*/
int pci_add_capability(PCIDevice *pdev, uint8_t cap_id,
uint8_t offset, uint8_t size,
Error **errp)
{
uint8_t *config;
int i, overlapping_cap;
if (!offset) {
offset = pci_find_space(pdev, size);
/* out of PCI config space is programming error */
assert(offset);
} else {
/* Verify that capabilities don't overlap. Note: device assignment
* depends on this check to verify that the device is not broken.
* Should never trigger for emulated devices, but it's helpful
* for debugging these. */
for (i = offset; i < offset + size; i++) {
overlapping_cap = pci_find_capability_at_offset(pdev, i);
if (overlapping_cap) {
error_setg(errp, "%s:%02x:%02x.%x "
"Attempt to add PCI capability %x at offset "
"%x overlaps existing capability %x at offset %x",
pci_root_bus_path(pdev), pci_dev_bus_num(pdev),
PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn),
cap_id, offset, overlapping_cap, i);
return -EINVAL;
}
}
}
config = pdev->config + offset;
config[PCI_CAP_LIST_ID] = cap_id;
config[PCI_CAP_LIST_NEXT] = pdev->config[PCI_CAPABILITY_LIST];
pdev->config[PCI_CAPABILITY_LIST] = offset;
pdev->config[PCI_STATUS] |= PCI_STATUS_CAP_LIST;
memset(pdev->used + offset, 0xFF, QEMU_ALIGN_UP(size, 4));
/* Make capability read-only by default */
memset(pdev->wmask + offset, 0, size);
/* Check capability by default */
memset(pdev->cmask + offset, 0xFF, size);
return offset;
}
/* Unlink capability from the pci config space. */
void pci_del_capability(PCIDevice *pdev, uint8_t cap_id, uint8_t size)
{
uint8_t prev, offset = pci_find_capability_list(pdev, cap_id, &prev);
if (!offset)
return;
pdev->config[prev] = pdev->config[offset + PCI_CAP_LIST_NEXT];
/* Make capability writable again */
memset(pdev->wmask + offset, 0xff, size);
memset(pdev->w1cmask + offset, 0, size);
/* Clear cmask as device-specific registers can't be checked */
memset(pdev->cmask + offset, 0, size);
memset(pdev->used + offset, 0, QEMU_ALIGN_UP(size, 4));
if (!pdev->config[PCI_CAPABILITY_LIST])
pdev->config[PCI_STATUS] &= ~PCI_STATUS_CAP_LIST;
}
uint8_t pci_find_capability(PCIDevice *pdev, uint8_t cap_id)
{
return pci_find_capability_list(pdev, cap_id, NULL);
}
static void pcibus_dev_print(Monitor *mon, DeviceState *dev, int indent)
{
PCIDevice *d = (PCIDevice *)dev;
const pci_class_desc *desc;
char ctxt[64];
PCIIORegion *r;
int i, class;
class = pci_get_word(d->config + PCI_CLASS_DEVICE);
desc = pci_class_descriptions;
while (desc->desc && class != desc->class)
desc++;
if (desc->desc) {
snprintf(ctxt, sizeof(ctxt), "%s", desc->desc);
} else {
snprintf(ctxt, sizeof(ctxt), "Class %04x", class);
}
monitor_printf(mon, "%*sclass %s, addr %02x:%02x.%x, "
"pci id %04x:%04x (sub %04x:%04x)\n",
indent, "", ctxt, pci_dev_bus_num(d),
PCI_SLOT(d->devfn), PCI_FUNC(d->devfn),
pci_get_word(d->config + PCI_VENDOR_ID),
pci_get_word(d->config + PCI_DEVICE_ID),
pci_get_word(d->config + PCI_SUBSYSTEM_VENDOR_ID),
pci_get_word(d->config + PCI_SUBSYSTEM_ID));
for (i = 0; i < PCI_NUM_REGIONS; i++) {
r = &d->io_regions[i];
if (!r->size)
continue;
monitor_printf(mon, "%*sbar %d: %s at 0x%"FMT_PCIBUS
" [0x%"FMT_PCIBUS"]\n",
indent, "",
i, r->type & PCI_BASE_ADDRESS_SPACE_IO ? "i/o" : "mem",
r->addr, r->addr + r->size - 1);
}
}
static char *pci_dev_fw_name(DeviceState *dev, char *buf, int len)
{
PCIDevice *d = (PCIDevice *)dev;
const char *name = NULL;
const pci_class_desc *desc = pci_class_descriptions;
int class = pci_get_word(d->config + PCI_CLASS_DEVICE);
while (desc->desc &&
(class & ~desc->fw_ign_bits) !=
(desc->class & ~desc->fw_ign_bits)) {
desc++;
}
if (desc->desc) {
name = desc->fw_name;
}
if (name) {
pstrcpy(buf, len, name);
} else {
snprintf(buf, len, "pci%04x,%04x",
pci_get_word(d->config + PCI_VENDOR_ID),
pci_get_word(d->config + PCI_DEVICE_ID));
}
return buf;
}
static char *pcibus_get_fw_dev_path(DeviceState *dev)
{
PCIDevice *d = (PCIDevice *)dev;
char path[50], name[33];
int off;
off = snprintf(path, sizeof(path), "%s@%x",
pci_dev_fw_name(dev, name, sizeof name),
PCI_SLOT(d->devfn));
if (PCI_FUNC(d->devfn))
snprintf(path + off, sizeof(path) + off, ",%x", PCI_FUNC(d->devfn));
return g_strdup(path);
}
static char *pcibus_get_dev_path(DeviceState *dev)
{
PCIDevice *d = container_of(dev, PCIDevice, qdev);
PCIDevice *t;
int slot_depth;
/* Path format: Domain:00:Slot.Function:Slot.Function....:Slot.Function.
* 00 is added here to make this format compatible with
* domain:Bus:Slot.Func for systems without nested PCI bridges.
* Slot.Function list specifies the slot and function numbers for all
* devices on the path from root to the specific device. */
const char *root_bus_path;
int root_bus_len;
char slot[] = ":SS.F";
int slot_len = sizeof slot - 1 /* For '\0' */;
int path_len;
char *path, *p;
int s;
root_bus_path = pci_root_bus_path(d);
root_bus_len = strlen(root_bus_path);
/* Calculate # of slots on path between device and root. */;
slot_depth = 0;
for (t = d; t; t = pci_get_bus(t)->parent_dev) {
++slot_depth;
}
path_len = root_bus_len + slot_len * slot_depth;
/* Allocate memory, fill in the terminating null byte. */
path = g_malloc(path_len + 1 /* For '\0' */);
path[path_len] = '\0';
memcpy(path, root_bus_path, root_bus_len);
/* Fill in slot numbers. We walk up from device to root, so need to print
* them in the reverse order, last to first. */
p = path + path_len;
for (t = d; t; t = pci_get_bus(t)->parent_dev) {
p -= slot_len;
s = snprintf(slot, sizeof slot, ":%02x.%x",
PCI_SLOT(t->devfn), PCI_FUNC(t->devfn));
assert(s == slot_len);
memcpy(p, slot, slot_len);
}
return path;
}
static int pci_qdev_find_recursive(PCIBus *bus,
const char *id, PCIDevice **pdev)
{
DeviceState *qdev = qdev_find_recursive(&bus->qbus, id);
if (!qdev) {
return -ENODEV;
}
/* roughly check if given qdev is pci device */
if (object_dynamic_cast(OBJECT(qdev), TYPE_PCI_DEVICE)) {
*pdev = PCI_DEVICE(qdev);
return 0;
}
return -EINVAL;
}
int pci_qdev_find_device(const char *id, PCIDevice **pdev)
{
PCIHostState *host_bridge;
int rc = -ENODEV;
QLIST_FOREACH(host_bridge, &pci_host_bridges, next) {
int tmp = pci_qdev_find_recursive(host_bridge->bus, id, pdev);
if (!tmp) {
rc = 0;
break;
}
if (tmp != -ENODEV) {
rc = tmp;
}
}
return rc;
}
MemoryRegion *pci_address_space(PCIDevice *dev)
{
return pci_get_bus(dev)->address_space_mem;
}
MemoryRegion *pci_address_space_io(PCIDevice *dev)
{
return pci_get_bus(dev)->address_space_io;
}
static void pci_device_class_init(ObjectClass *klass, void *data)
{
DeviceClass *k = DEVICE_CLASS(klass);
k->realize = pci_qdev_realize;
k->unrealize = pci_qdev_unrealize;
k->bus_type = TYPE_PCI_BUS;
device_class_set_props(k, pci_props);
}
static void pci_device_class_base_init(ObjectClass *klass, void *data)
{
if (!object_class_is_abstract(klass)) {
ObjectClass *conventional =
object_class_dynamic_cast(klass, INTERFACE_CONVENTIONAL_PCI_DEVICE);
ObjectClass *pcie =
object_class_dynamic_cast(klass, INTERFACE_PCIE_DEVICE);
assert(conventional || pcie);
}
}
AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
{
PCIBus *bus = pci_get_bus(dev);
PCIBus *iommu_bus = bus;
uint8_t devfn = dev->devfn;
while (iommu_bus && !iommu_bus->iommu_fn && iommu_bus->parent_dev) {
PCIBus *parent_bus = pci_get_bus(iommu_bus->parent_dev);
/*
* The requester ID of the provided device may be aliased, as seen from
* the IOMMU, due to topology limitations. The IOMMU relies on a
* requester ID to provide a unique AddressSpace for devices, but
* conventional PCI buses pre-date such concepts. Instead, the PCIe-
* to-PCI bridge creates and accepts transactions on behalf of down-
* stream devices. When doing so, all downstream devices are masked
* (aliased) behind a single requester ID. The requester ID used
* depends on the format of the bridge devices. Proper PCIe-to-PCI
* bridges, with a PCIe capability indicating such, follow the
* guidelines of chapter 2.3 of the PCIe-to-PCI/X bridge specification,
* where the bridge uses the seconary bus as the bridge portion of the
* requester ID and devfn of 00.0. For other bridges, typically those
* found on the root complex such as the dmi-to-pci-bridge, we follow
* the convention of typical bare-metal hardware, which uses the
* requester ID of the bridge itself. There are device specific
* exceptions to these rules, but these are the defaults that the
* Linux kernel uses when determining DMA aliases itself and believed
* to be true for the bare metal equivalents of the devices emulated
* in QEMU.
*/
if (!pci_bus_is_express(iommu_bus)) {
PCIDevice *parent = iommu_bus->parent_dev;
if (pci_is_express(parent) &&
pcie_cap_get_type(parent) == PCI_EXP_TYPE_PCI_BRIDGE) {
devfn = PCI_DEVFN(0, 0);
bus = iommu_bus;
} else {
devfn = parent->devfn;
bus = parent_bus;
}
}
iommu_bus = parent_bus;
}
if (iommu_bus && iommu_bus->iommu_fn) {
return iommu_bus->iommu_fn(bus, iommu_bus->iommu_opaque, devfn);
}
return &address_space_memory;
}
void pci_setup_iommu(PCIBus *bus, PCIIOMMUFunc fn, void *opaque)
{
bus->iommu_fn = fn;
bus->iommu_opaque = opaque;
}
static void pci_dev_get_w64(PCIBus *b, PCIDevice *dev, void *opaque)
{
Range *range = opaque;
PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
uint16_t cmd = pci_get_word(dev->config + PCI_COMMAND);
int i;
if (!(cmd & PCI_COMMAND_MEMORY)) {
return;
}
if (pc->is_bridge) {
pcibus_t base = pci_bridge_get_base(dev, PCI_BASE_ADDRESS_MEM_PREFETCH);
pcibus_t limit = pci_bridge_get_limit(dev, PCI_BASE_ADDRESS_MEM_PREFETCH);
base = MAX(base, 0x1ULL << 32);
if (limit >= base) {
Range pref_range;
range_set_bounds(&pref_range, base, limit);
range_extend(range, &pref_range);
}
}
for (i = 0; i < PCI_NUM_REGIONS; ++i) {
PCIIORegion *r = &dev->io_regions[i];
pcibus_t lob, upb;
Range region_range;
if (!r->size ||
(r->type & PCI_BASE_ADDRESS_SPACE_IO) ||
!(r->type & PCI_BASE_ADDRESS_MEM_TYPE_64)) {
continue;
}
lob = pci_bar_address(dev, i, r->type, r->size);
upb = lob + r->size - 1;
if (lob == PCI_BAR_UNMAPPED) {
continue;
}
lob = MAX(lob, 0x1ULL << 32);
if (upb >= lob) {
range_set_bounds(&region_range, lob, upb);
range_extend(range, &region_range);
}
}
}
void pci_bus_get_w64_range(PCIBus *bus, Range *range)
{
range_make_empty(range);
pci_for_each_device_under_bus(bus, pci_dev_get_w64, range);
}
static bool pcie_has_upstream_port(PCIDevice *dev)
{
PCIDevice *parent_dev = pci_bridge_get_device(pci_get_bus(dev));
/* Device associated with an upstream port.
* As there are several types of these, it's easier to check the
* parent device: upstream ports are always connected to
* root or downstream ports.
*/
return parent_dev &&
pci_is_express(parent_dev) &&
parent_dev->exp.exp_cap &&
(pcie_cap_get_type(parent_dev) == PCI_EXP_TYPE_ROOT_PORT ||
pcie_cap_get_type(parent_dev) == PCI_EXP_TYPE_DOWNSTREAM);
}
PCIDevice *pci_get_function_0(PCIDevice *pci_dev)
{
PCIBus *bus = pci_get_bus(pci_dev);
if(pcie_has_upstream_port(pci_dev)) {
/* With an upstream PCIe port, we only support 1 device at slot 0 */
return bus->devices[0];
} else {
/* Other bus types might support multiple devices at slots 0-31 */
return bus->devices[PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 0)];
}
}
MSIMessage pci_get_msi_message(PCIDevice *dev, int vector)
{
MSIMessage msg;
if (msix_enabled(dev)) {
msg = msix_get_message(dev, vector);
} else if (msi_enabled(dev)) {
msg = msi_get_message(dev, vector);
} else {
/* Should never happen */
error_report("%s: unknown interrupt type", __func__);
abort();
}
return msg;
}
static const TypeInfo pci_device_type_info = {
.name = TYPE_PCI_DEVICE,
.parent = TYPE_DEVICE,
.instance_size = sizeof(PCIDevice),
.abstract = true,
.class_size = sizeof(PCIDeviceClass),
.class_init = pci_device_class_init,
.class_base_init = pci_device_class_base_init,
};
static void pci_register_types(void)
{
type_register_static(&pci_bus_info);
type_register_static(&pcie_bus_info);
type_register_static(&conventional_pci_interface_info);
type_register_static(&pcie_interface_info);
type_register_static(&pci_device_type_info);
}
type_init(pci_register_types)
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