--- /dev/null
+/*
+ * QEMU<->ACPI BIOS PCI hotplug interface
+ *
+ * QEMU supports PCI hotplug via ACPI. This module
+ * implements the interface between QEMU and the ACPI BIOS.
+ * Interface specification - see docs/specs/acpi_pci_hotplug.txt
+ *
+ * Copyright (c) 2013, Red Hat Inc, Michael S. Tsirkin (mst@redhat.com)
+ * Copyright (c) 2006 Fabrice Bellard
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>
+ *
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
+ */
+
+#include "hw/acpi/pcihp.h"
+
+#include "hw/hw.h"
+#include "hw/i386/pc.h"
+#include "hw/pci/pci.h"
+#include "hw/acpi/acpi.h"
+#include "sysemu/sysemu.h"
+#include "exec/ioport.h"
+#include "exec/address-spaces.h"
+#include "hw/pci/pci_bus.h"
+#include "qom/qom-qobject.h"
+#include "qapi/qmp/qint.h"
+
+//#define DEBUG
+
+#ifdef DEBUG
+# define ACPI_PCIHP_DPRINTF(format, ...) printf(format, ## __VA_ARGS__)
+#else
+# define ACPI_PCIHP_DPRINTF(format, ...) do { } while (0)
+#endif
+
+#define ACPI_PCIHP_ADDR 0xae00
+#define ACPI_PCIHP_SIZE 0x0014
+#define ACPI_PCIHP_LEGACY_SIZE 0x000f
+#define PCI_UP_BASE 0x0000
+#define PCI_DOWN_BASE 0x0004
+#define PCI_EJ_BASE 0x0008
+#define PCI_RMV_BASE 0x000c
+#define PCI_SEL_BASE 0x0010
+
+typedef struct AcpiPciHpFind {
+ int bsel;
+ PCIBus *bus;
+} AcpiPciHpFind;
+
+static int acpi_pcihp_get_bsel(PCIBus *bus)
+{
+ Error *local_err = NULL;
+ int64_t bsel = object_property_get_int(OBJECT(bus), ACPI_PCIHP_PROP_BSEL,
+ &local_err);
+
+ if (local_err || bsel < 0 || bsel >= ACPI_PCIHP_MAX_HOTPLUG_BUS) {
+ if (local_err) {
+ error_free(local_err);
+ }
+ return -1;
+ } else {
+ return bsel;
+ }
+}
+
+static void acpi_pcihp_test_hotplug_bus(PCIBus *bus, void *opaque)
+{
+ AcpiPciHpFind *find = opaque;
+ if (find->bsel == acpi_pcihp_get_bsel(bus)) {
+ find->bus = bus;
+ }
+}
+
+static PCIBus *acpi_pcihp_find_hotplug_bus(AcpiPciHpState *s, int bsel)
+{
+ AcpiPciHpFind find = { .bsel = bsel, .bus = NULL };
+
+ if (bsel < 0) {
+ return NULL;
+ }
+
+ pci_for_each_bus(s->root, acpi_pcihp_test_hotplug_bus, &find);
+
+ /* Make bsel 0 eject root bus if bsel property is not set,
+ * for compatibility with non acpi setups.
+ * TODO: really needed?
+ */
+ if (!bsel && !find.bus) {
+ find.bus = s->root;
+ }
+ return find.bus;
+}
+
+static bool acpi_pcihp_pc_no_hotplug(AcpiPciHpState *s, PCIDevice *dev)
+{
+ PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
+ DeviceClass *dc = DEVICE_GET_CLASS(dev);
+ /*
+ * ACPI doesn't allow hotplug of bridge devices. Don't allow
+ * hot-unplug of bridge devices unless they were added by hotplug
+ * (and so, not described by acpi).
+ */
+ return (pc->is_bridge && !dev->qdev.hotplugged) || !dc->hotpluggable;
+}
+
+static void acpi_pcihp_eject_slot(AcpiPciHpState *s, unsigned bsel, unsigned slots)
+{
+ BusChild *kid, *next;
+ int slot = ctz32(slots);
+ PCIBus *bus = acpi_pcihp_find_hotplug_bus(s, bsel);
+
+ if (!bus) {
+ return;
+ }
+
+ /* Mark request as complete */
+ s->acpi_pcihp_pci_status[bsel].down &= ~(1U << slot);
+ s->acpi_pcihp_pci_status[bsel].up &= ~(1U << slot);
+
+ QTAILQ_FOREACH_SAFE(kid, &bus->qbus.children, sibling, next) {
+ DeviceState *qdev = kid->child;
+ PCIDevice *dev = PCI_DEVICE(qdev);
+ if (PCI_SLOT(dev->devfn) == slot) {
+ if (!acpi_pcihp_pc_no_hotplug(s, dev)) {
+ object_unparent(OBJECT(qdev));
+ }
+ }
+ }
+}
+
+static void acpi_pcihp_update_hotplug_bus(AcpiPciHpState *s, int bsel)
+{
+ BusChild *kid, *next;
+ PCIBus *bus = acpi_pcihp_find_hotplug_bus(s, bsel);
+
+ /* Execute any pending removes during reset */
+ while (s->acpi_pcihp_pci_status[bsel].down) {
+ acpi_pcihp_eject_slot(s, bsel, s->acpi_pcihp_pci_status[bsel].down);
+ }
+
+ s->acpi_pcihp_pci_status[bsel].hotplug_enable = ~0;
+
+ if (!bus) {
+ return;
+ }
+ QTAILQ_FOREACH_SAFE(kid, &bus->qbus.children, sibling, next) {
+ DeviceState *qdev = kid->child;
+ PCIDevice *pdev = PCI_DEVICE(qdev);
+ int slot = PCI_SLOT(pdev->devfn);
+
+ if (acpi_pcihp_pc_no_hotplug(s, pdev)) {
+ s->acpi_pcihp_pci_status[bsel].hotplug_enable &= ~(1U << slot);
+ }
+ }
+}
+
+static void acpi_pcihp_update(AcpiPciHpState *s)
+{
+ int i;
+
+ for (i = 0; i < ACPI_PCIHP_MAX_HOTPLUG_BUS; ++i) {
+ acpi_pcihp_update_hotplug_bus(s, i);
+ }
+}
+
+void acpi_pcihp_reset(AcpiPciHpState *s)
+{
+ acpi_pcihp_update(s);
+}
+
+void acpi_pcihp_device_plug_cb(ACPIREGS *ar, qemu_irq irq, AcpiPciHpState *s,
+ DeviceState *dev, Error **errp)
+{
+ PCIDevice *pdev = PCI_DEVICE(dev);
+ int slot = PCI_SLOT(pdev->devfn);
+ int bsel = acpi_pcihp_get_bsel(pdev->bus);
+ if (bsel < 0) {
+ error_setg(errp, "Unsupported bus. Bus doesn't have property '"
+ ACPI_PCIHP_PROP_BSEL "' set");
+ return;
+ }
+
+ /* Don't send event when device is enabled during qemu machine creation:
+ * it is present on boot, no hotplug event is necessary. We do send an
+ * event when the device is disabled later. */
+ if (!dev->hotplugged) {
+ return;
+ }
+
+ s->acpi_pcihp_pci_status[bsel].up |= (1U << slot);
+
+ acpi_send_gpe_event(ar, irq, ACPI_PCI_HOTPLUG_STATUS);
+}
+
+void acpi_pcihp_device_unplug_cb(ACPIREGS *ar, qemu_irq irq, AcpiPciHpState *s,
+ DeviceState *dev, Error **errp)
+{
+ PCIDevice *pdev = PCI_DEVICE(dev);
+ int slot = PCI_SLOT(pdev->devfn);
+ int bsel = acpi_pcihp_get_bsel(pdev->bus);
+ if (bsel < 0) {
+ error_setg(errp, "Unsupported bus. Bus doesn't have property '"
+ ACPI_PCIHP_PROP_BSEL "' set");
+ return;
+ }
+
+ s->acpi_pcihp_pci_status[bsel].down |= (1U << slot);
+
+ acpi_send_gpe_event(ar, irq, 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;
+ }
+ ACPI_PCIHP_DPRINTF("pci_up_read %" PRIu32 "\n", val);
+ break;
+ case PCI_DOWN_BASE:
+ val = s->acpi_pcihp_pci_status[bsel].down;
+ ACPI_PCIHP_DPRINTF("pci_down_read %" PRIu32 "\n", val);
+ break;
+ case PCI_EJ_BASE:
+ /* No feature defined yet */
+ ACPI_PCIHP_DPRINTF("pci_features_read %" PRIu32 "\n", val);
+ break;
+ case PCI_RMV_BASE:
+ val = s->acpi_pcihp_pci_status[bsel].hotplug_enable;
+ ACPI_PCIHP_DPRINTF("pci_rmv_read %" PRIu32 "\n", val);
+ break;
+ case PCI_SEL_BASE:
+ val = s->hotplug_select;
+ ACPI_PCIHP_DPRINTF("pci_sel_read %" PRIu32 "\n", val);
+ default:
+ break;
+ }
+
+ return val;
+}
+
+static void pci_write(void *opaque, hwaddr addr, uint64_t data,
+ unsigned int size)
+{
+ AcpiPciHpState *s = opaque;
+ switch (addr) {
+ case PCI_EJ_BASE:
+ if (s->hotplug_select >= ACPI_PCIHP_MAX_HOTPLUG_BUS) {
+ break;
+ }
+ acpi_pcihp_eject_slot(s, s->hotplug_select, data);
+ ACPI_PCIHP_DPRINTF("pciej write %" HWADDR_PRIx " <== %" PRIu64 "\n",
+ addr, data);
+ break;
+ case PCI_SEL_BASE:
+ s->hotplug_select = data;
+ ACPI_PCIHP_DPRINTF("pcisel write %" HWADDR_PRIx " <== %" PRIu64 "\n",
+ addr, data);
+ default:
+ break;
+ }
+}
+
+static const MemoryRegionOps acpi_pcihp_io_ops = {
+ .read = pci_read,
+ .write = pci_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ },
+};
+
+void acpi_pcihp_init(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;
+
+ if (s->legacy_piix) {
+ unsigned *bus_bsel = g_malloc(sizeof *bus_bsel);
+
+ s->io_len = ACPI_PCIHP_LEGACY_SIZE;
+
+ *bus_bsel = ACPI_PCIHP_BSEL_DEFAULT;
+ object_property_add_uint32_ptr(OBJECT(root_bus), ACPI_PCIHP_PROP_BSEL,
+ bus_bsel, NULL);
+ }
+
+ memory_region_init_io(&s->io, 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,
+ &error_abort);
+ object_property_add_uint16_ptr(owner, ACPI_PCIHP_IO_LEN_PROP, &s->io_len,
+ &error_abort);
+}
+
+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()
+ }
+};
Code Review / kvmfornfv.git / blobdiff