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-rw-r--r--hw/acpi/pcihp.c570
1 files changed, 570 insertions, 0 deletions
diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
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+++ b/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 2.1 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/pci/pci_host.h"
+#include "hw/pci/pcie_port.h"
+#include "hw/pci-bridge/xio3130_downstream.h"
+#include "hw/i386/acpi-build.h"
+#include "hw/acpi/acpi.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_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;
+ Object *host = acpi_get_i386_pci_host();
+ PCIBus *bus;
+ unsigned bsel_alloc = ACPI_PCIHP_BSEL_DEFAULT;
+
+ if (bsel_is_set) {
+ return;
+ }
+ bsel_is_set = true;
+
+ if (!host) {
+ return;
+ }
+
+ bus = PCI_HOST_BRIDGE(host)->bus;
+ 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)
+{
+ Object *host = acpi_get_i386_pci_host();
+ PCIBus *bus;
+
+ bus = PCI_HOST_BRIDGE(host)->bus;
+ if (bus && qbus_is_hotpluggable(BUS(bus))) {
+ /* setting the hotplug handler to NULL makes the bus non-hotpluggable */
+ qbus_set_hotplug_handler(BUS(bus), NULL);
+ }
+
+ 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).
+ *
+ * Don't allow hot-unplug of SR-IOV Virtual Functions, as they
+ * will be removed implicitly, when Physical Function is unplugged.
+ */
+ return (pc->is_bridge && !dev->qdev.hotplugged) || !dc->hotpluggable ||
+ pci_is_vf(dev);
+}
+
+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)) {
+ /*
+ * partially_hotplugged is used by virtio-net failover:
+ * failover has asked the guest OS to unplug the device
+ * but we need to keep some references to the device
+ * to be able to plug it back in case of failure so
+ * we don't execute hotplug_handler_unplug().
+ */
+ if (dev->partially_hotplugged) {
+ /*
+ * pending_deleted_event is set to true when
+ * virtio-net failover asks to unplug the device,
+ * and set to false here when the operation is done
+ * This is used by the migration loop to detect the
+ * end of the operation and really start the migration.
+ */
+ qdev->pending_deleted_event = false;
+ } else {
+ 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(pdev)) < 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);
+ PCIDevice *bridge;
+ PCIBus *bus;
+ 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));
+
+ /* Remove all hot-plug handlers if hot-plug is disabled on slot */
+ if (object_dynamic_cast(OBJECT(dev), TYPE_PCIE_SLOT) &&
+ !PCIE_SLOT(pdev)->hotplug) {
+ qbus_set_hotplug_handler(BUS(sec), NULL);
+ return;
+ }
+
+ 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;
+ }
+
+ bus = pci_get_bus(pdev);
+ bridge = pci_bridge_get_device(bus);
+ if (object_dynamic_cast(OBJECT(bridge), TYPE_PCIE_ROOT_PORT) ||
+ object_dynamic_cast(OBJECT(bridge), TYPE_XIO3130_DOWNSTREAM)) {
+ pcie_cap_slot_enable_power(bridge);
+ }
+
+ bsel = acpi_pcihp_get_bsel(bus);
+ 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(pdev->devfn),
+ acpi_pcihp_get_bsel(pci_get_bus(pdev)));
+
+ /*
+ * 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;
+ }
+
+ /*
+ * pending_deleted_event is used by virtio-net failover to detect the
+ * end of the unplug operation, the flag is set to false in
+ * acpi_pcihp_eject_slot() when the operation is completed.
+ */
+ pdev->qdev.pending_deleted_event = true;
+ 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);
+ if (!bus) {
+ break;
+ }
+ 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,
+ uint16_t io_base)
+{
+ s->io_len = ACPI_PCIHP_SIZE;
+ s->io_base = io_base;
+
+ 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);
+}
+
+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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