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envelope-from=jag.raman@oracle.com; helo=mx0b-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: eduardo@habkost.net, elena.ufimtseva@oracle.com, john.g.johnson@oracle.com, berrange@redhat.com, bleal@redhat.com, john.levon@nutanix.com, mst@redhat.com, armbru@redhat.com, quintela@redhat.com, f4bug@amsat.org, marcandre.lureau@gmail.com, stefanha@redhat.com, thanos.makatos@nutanix.com, pbonzini@redhat.com, jag.raman@oracle.com, eblake@redhat.com, dgilbert@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Adds pci_isol_bus_new() and pci_isol_bus_free() functions to manage creation and destruction of isolated PCI buses. Also adds qdev_get_bus and qdev_put_bus callbacks to allow the choice of parent bus. Signed-off-by: Elena Ufimtseva Signed-off-by: John G Johnson Signed-off-by: Jagannathan Raman --- include/hw/pci/pci.h | 4 + include/hw/qdev-core.h | 16 ++++ hw/pci/pci.c | 169 +++++++++++++++++++++++++++++++++++++++++ softmmu/qdev-monitor.c | 39 +++++++++- 4 files changed, 225 insertions(+), 3 deletions(-) diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h index 9bb4472abc..8c18f10d9d 100644 --- a/include/hw/pci/pci.h +++ b/include/hw/pci/pci.h @@ -452,6 +452,10 @@ PCIDevice *pci_nic_init_nofail(NICInfo *nd, PCIBus *rootbus, PCIDevice *pci_vga_init(PCIBus *bus); +PCIBus *pci_isol_bus_new(BusState *parent_bus, const char *new_bus_type, + Error **errp); +bool pci_isol_bus_free(PCIBus *pci_bus, Error **errp); + static inline PCIBus *pci_get_bus(const PCIDevice *dev) { return PCI_BUS(qdev_get_parent_bus(DEVICE(dev))); diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h index 92c3d65208..eed2983072 100644 --- a/include/hw/qdev-core.h +++ b/include/hw/qdev-core.h @@ -419,6 +419,20 @@ void qdev_simple_device_unplug_cb(HotplugHandler *hotplug_dev, void qdev_machine_creation_done(void); bool qdev_machine_modified(void); +/** + * Find parent bus - these callbacks are used during device addition + * and deletion. + * + * During addition, if no parent bus is specified in the options, + * these callbacks provide a way to figure it out based on the + * bus type. If these callbacks are not defined, defaults to + * finding the parent bus starting from default system bus + */ +typedef bool (QDevGetBusFunc)(const char *type, BusState **bus, Error **errp); +typedef bool (QDevPutBusFunc)(BusState *bus, Error **errp); +bool qdev_set_bus_cbs(QDevGetBusFunc *get_bus, QDevPutBusFunc *put_bus, + Error **errp); + /** * GpioPolarity: Polarity of a GPIO line * @@ -691,6 +705,8 @@ BusState *qdev_get_parent_bus(DeviceState *dev); /*** BUS API. ***/ DeviceState *qdev_find_recursive(BusState *bus, const char *id); +BusState *qbus_find_recursive(BusState *bus, const char *name, + const char *bus_typename); /* Returns 0 to walk children, > 0 to skip walk, < 0 to terminate walk. */ typedef int (qbus_walkerfn)(BusState *bus, void *opaque); diff --git a/hw/pci/pci.c b/hw/pci/pci.c index d5f1c6c421..63ec1e47b5 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -493,6 +493,175 @@ void pci_root_bus_cleanup(PCIBus *bus) qbus_unrealize(BUS(bus)); } +static void pci_bus_free_isol_mem(PCIBus *pci_bus) +{ + if (pci_bus->address_space_mem) { + memory_region_unref(pci_bus->address_space_mem); + pci_bus->address_space_mem = NULL; + } + + if (pci_bus->isol_as_mem) { + address_space_destroy(pci_bus->isol_as_mem); + pci_bus->isol_as_mem = NULL; + } + + if (pci_bus->address_space_io) { + memory_region_unref(pci_bus->address_space_io); + pci_bus->address_space_io = NULL; + } + + if (pci_bus->isol_as_io) { + address_space_destroy(pci_bus->isol_as_io); + pci_bus->isol_as_io = NULL; + } +} + +static void pci_bus_init_isol_mem(PCIBus *pci_bus, uint32_t unique_id) +{ + g_autofree char *mem_mr_name = NULL; + g_autofree char *mem_as_name = NULL; + g_autofree char *io_mr_name = NULL; + g_autofree char *io_as_name = NULL; + + if (!pci_bus) { + return; + } + + mem_mr_name = g_strdup_printf("mem-mr-%u", unique_id); + mem_as_name = g_strdup_printf("mem-as-%u", unique_id); + io_mr_name = g_strdup_printf("io-mr-%u", unique_id); + io_as_name = g_strdup_printf("io-as-%u", unique_id); + + pci_bus->address_space_mem = g_malloc0(sizeof(MemoryRegion)); + pci_bus->isol_as_mem = g_malloc0(sizeof(AddressSpace)); + memory_region_init(pci_bus->address_space_mem, NULL, + mem_mr_name, UINT64_MAX); + address_space_init(pci_bus->isol_as_mem, + pci_bus->address_space_mem, mem_as_name); + + pci_bus->address_space_io = g_malloc0(sizeof(MemoryRegion)); + pci_bus->isol_as_io = g_malloc0(sizeof(AddressSpace)); + memory_region_init(pci_bus->address_space_io, NULL, + io_mr_name, UINT64_MAX); + address_space_init(pci_bus->isol_as_io, + pci_bus->address_space_io, io_as_name); +} + +PCIBus *pci_isol_bus_new(BusState *parent_bus, const char *new_bus_type, + Error **errp) +{ + ERRP_GUARD(); + PCIBus *parent_pci_bus = NULL; + DeviceState *pcie_root_port = NULL; + g_autofree char *new_bus_name = NULL; + PCIBus *new_pci_bus = NULL; + HotplugHandler *hotplug_handler = NULL; + uint32_t devfn, slot; + + if (!parent_bus) { + error_setg(errp, "parent PCI bus not found"); + return NULL; + } + + if (!new_bus_type || + (strcmp(new_bus_type, TYPE_PCIE_BUS) && + strcmp(new_bus_type, TYPE_PCI_BUS))) { + error_setg(errp, "bus type must be %s or %s", TYPE_PCIE_BUS, + TYPE_PCI_BUS); + return NULL; + } + + if (!object_dynamic_cast(OBJECT(parent_bus), TYPE_PCI_BUS)) { + error_setg(errp, "Unsupported root bus type"); + return NULL; + } + + parent_pci_bus = PCI_BUS(parent_bus); + + /** + * Create TYPE_GEN_PCIE_ROOT_PORT device to interface parent and + * new buses. + */ + for (devfn = 0; devfn < (PCI_SLOT_MAX * PCI_FUNC_MAX); + devfn += PCI_FUNC_MAX) { + if (!parent_pci_bus->devices[devfn]) { + break; + } + } + if (devfn == (PCI_SLOT_MAX * PCI_FUNC_MAX)) { + error_setg(errp, "parent PCI slots full"); + return NULL; + } + + slot = devfn / PCI_FUNC_MAX; + pcie_root_port = qdev_new("pcie-root-port"); + if (!object_property_set_int(OBJECT(pcie_root_port), "slot", + slot, errp)){ + error_prepend(errp, "Failed to set slot property for root port: "); + goto fail_rp_init; + } + if (!qdev_realize(pcie_root_port, parent_bus, errp)) { + goto fail_rp_init; + } + + /** + * Create new PCI bus and plug it to the root port + */ + new_bus_name = g_strdup_printf("pci-bus-%d", (slot + 1)); + new_pci_bus = PCI_BUS(qbus_new(new_bus_type, pcie_root_port, new_bus_name)); + new_pci_bus->parent_dev = PCI_DEVICE(pcie_root_port); + hotplug_handler = qdev_get_bus_hotplug_handler(pcie_root_port); + qbus_set_hotplug_handler(BUS(new_pci_bus), OBJECT(hotplug_handler)); + pci_default_write_config(new_pci_bus->parent_dev, PCI_SECONDARY_BUS, + (slot + 1), 1); + pci_default_write_config(new_pci_bus->parent_dev, PCI_SUBORDINATE_BUS, + (slot + 1), 1); + pci_bus_init_isol_mem(new_pci_bus, (slot + 1)); + + QLIST_INIT(&new_pci_bus->child); + QLIST_INSERT_HEAD(&parent_pci_bus->child, new_pci_bus, sibling); + + if (!qbus_realize(BUS(new_pci_bus), errp)) { + QLIST_REMOVE(new_pci_bus, sibling); + pci_bus_free_isol_mem(new_pci_bus); + object_unparent(OBJECT(new_pci_bus)); + new_pci_bus = NULL; + goto fail_rp_init; + } + + return new_pci_bus; + +fail_rp_init: + qdev_unrealize(pcie_root_port); + object_unparent(OBJECT(pcie_root_port)); + pcie_root_port = NULL; + return NULL; +} + +bool pci_isol_bus_free(PCIBus *pci_bus, Error **errp) +{ + ERRP_GUARD(); + PCIDevice *pcie_root_port = pci_bus->parent_dev; + + if (!pcie_root_port) { + error_setg(errp, "Can't unplug root bus"); + return false; + } + + if (!QLIST_EMPTY(&pci_bus->child)) { + error_setg(errp, "Bus has attached device"); + return false; + } + + QLIST_REMOVE(pci_bus, sibling); + pci_bus_free_isol_mem(pci_bus); + qbus_unrealize(BUS(pci_bus)); + object_unparent(OBJECT(pci_bus)); + qdev_unrealize(DEVICE(pcie_root_port)); + object_unparent(OBJECT(pcie_root_port)); + return true; +} + void pci_bus_irqs(PCIBus *bus, pci_set_irq_fn set_irq, pci_map_irq_fn map_irq, void *irq_opaque, int nirq) { diff --git a/softmmu/qdev-monitor.c b/softmmu/qdev-monitor.c index 01f3834db5..7306074019 100644 --- a/softmmu/qdev-monitor.c +++ b/softmmu/qdev-monitor.c @@ -64,6 +64,9 @@ typedef struct QDevAlias #define QEMU_ARCH_VIRTIO_CCW (QEMU_ARCH_S390X) #define QEMU_ARCH_VIRTIO_MMIO (QEMU_ARCH_M68K) +static QDevGetBusFunc *qdev_get_bus; +static QDevPutBusFunc *qdev_put_bus; + /* Please keep this table sorted by typename. */ static const QDevAlias qdev_alias_table[] = { { "AC97", "ac97" }, /* -soundhw name */ @@ -450,7 +453,7 @@ static inline bool qbus_is_full(BusState *bus) * If more than one exists, prefer one that can take another device. * Return the bus if found, else %NULL. */ -static BusState *qbus_find_recursive(BusState *bus, const char *name, +BusState *qbus_find_recursive(BusState *bus, const char *name, const char *bus_typename) { BusChild *kid; @@ -608,6 +611,20 @@ const char *qdev_set_id(DeviceState *dev, char *id, Error **errp) return prop->name; } + +bool qdev_set_bus_cbs(QDevGetBusFunc *get_bus, QDevPutBusFunc *put_bus, + Error **errp) +{ + if (qdev_get_bus || qdev_put_bus) { + error_setg(errp, "callbacks already set"); + return false; + } + + qdev_get_bus = get_bus; + qdev_put_bus = put_bus; + return true; +} + DeviceState *qdev_device_add_from_qdict(const QDict *opts, bool from_json, Error **errp) { @@ -642,7 +659,13 @@ DeviceState *qdev_device_add_from_qdict(const QDict *opts, driver, object_get_typename(OBJECT(bus))); return NULL; } - } else if (dc->bus_type != NULL) { + } else if (dc->bus_type != NULL && qdev_get_bus != NULL) { + if (!qdev_get_bus(dc->bus_type, &bus, errp)) { + return NULL; + } + } + + if (!bus && dc->bus_type != NULL) { bus = qbus_find_recursive(sysbus_get_default(), NULL, dc->bus_type); if (!bus || qbus_is_full(bus)) { error_setg(errp, "No '%s' bus found for device '%s'", @@ -891,10 +914,12 @@ static DeviceState *find_device_state(const char *id, Error **errp) void qdev_unplug(DeviceState *dev, Error **errp) { + ERRP_GUARD(); DeviceClass *dc = DEVICE_GET_CLASS(dev); HotplugHandler *hotplug_ctrl; HotplugHandlerClass *hdc; Error *local_err = NULL; + BusState *parent_bus = qdev_get_parent_bus(dev); if (dev->parent_bus && !qbus_is_hotpluggable(dev->parent_bus)) { error_setg(errp, QERR_BUS_NO_HOTPLUG, dev->parent_bus->name); @@ -930,7 +955,15 @@ void qdev_unplug(DeviceState *dev, Error **errp) object_unparent(OBJECT(dev)); } } - error_propagate(errp, local_err); + + if (local_err) { + error_propagate(errp, local_err); + return; + } + + if (qdev_put_bus) { + qdev_put_bus(parent_bus, errp); + } } void qmp_device_del(const char *id, Error **errp)