b69c3c21a5
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>
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*
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* SDHCI device on PCI
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/module.h"
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#include "hw/qdev-properties.h"
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#include "hw/sd/sdhci.h"
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#include "sdhci-internal.h"
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static Property sdhci_pci_properties[] = {
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DEFINE_SDHCI_COMMON_PROPERTIES(SDHCIState),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void sdhci_pci_realize(PCIDevice *dev, Error **errp)
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{
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SDHCIState *s = PCI_SDHCI(dev);
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Error *local_err = NULL;
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sdhci_initfn(s);
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sdhci_common_realize(s, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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dev->config[PCI_CLASS_PROG] = 0x01; /* Standard Host supported DMA */
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dev->config[PCI_INTERRUPT_PIN] = 0x01; /* interrupt pin A */
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s->irq = pci_allocate_irq(dev);
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s->dma_as = pci_get_address_space(dev);
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pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->iomem);
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}
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static void sdhci_pci_exit(PCIDevice *dev)
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{
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SDHCIState *s = PCI_SDHCI(dev);
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sdhci_common_unrealize(s);
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sdhci_uninitfn(s);
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}
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static void sdhci_pci_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
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k->realize = sdhci_pci_realize;
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k->exit = sdhci_pci_exit;
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k->vendor_id = PCI_VENDOR_ID_REDHAT;
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k->device_id = PCI_DEVICE_ID_REDHAT_SDHCI;
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k->class_id = PCI_CLASS_SYSTEM_SDHCI;
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device_class_set_props(dc, sdhci_pci_properties);
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sdhci_common_class_init(klass, data);
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}
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static const TypeInfo sdhci_pci_info = {
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.name = TYPE_PCI_SDHCI,
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.parent = TYPE_PCI_DEVICE,
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.instance_size = sizeof(SDHCIState),
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.class_init = sdhci_pci_class_init,
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.interfaces = (InterfaceInfo[]) {
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{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
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{ },
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},
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};
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static void sdhci_pci_register_type(void)
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{
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type_register_static(&sdhci_pci_info);
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}
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type_init(sdhci_pci_register_type)
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