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qemu.19806
0140-s390x-pci-Introduce-unplug-requests.patch
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File 0140-s390x-pci-Introduce-unplug-requests.patch of Package qemu.19806
From: David Hildenbrand <david@redhat.com> Date: Wed, 30 Jan 2019 16:57:31 +0100 Subject: s390x/pci: Introduce unplug requests and split unplug handler Include-If: %if 0%{?suse_version} == 1315 Git-commit: e0998fe8910435f0e818e5c9ac58d4d2d9144a98 References: bsc#1179725 PCI on s390x is really weird and how it was modeled in QEMU might not have been the right choice. Anyhow, right now it is the case that: - Hotplugging a PCI device will silently create a zPCI device (if none is provided) - Hotunplugging a zPCI device will unplug the PCI device (if any) - Hotunplugging a PCI device will unplug also the zPCI device As far as I can see, we can no longer change this behavior. But we should fix it. Both device types are handled via a single hotplug handler call. This is problematic for various reasons: 1. Unplugging via the zPCI device allows to unplug devices that are not hot removable. (check performed in qdev_unplug()) - bad. 2. Hotplug handler chains are not possible for the unplug case. In the future, the machine might want to override hotplug handlers, to process device specific stuff and to then branch off to the actual hotplug handler. We need separate hotplug handler calls for both the PCI and zPCI device to make this work reliably. All other PCI implementations are already prepared to handle this correctly, only s390x is missing. Therefore, introduce the unplug_request handler and properly perform unplug checks by redirecting to the separate unplug_request handlers. When finally unplugging, perform two separate hotplug_handler_unplug() calls, first for the PCI device, followed by the zPCI device. This now nicely splits unplugging paths for both devices. The redirect part is a little hairy, as the user is allowed to trigger unplug either via the PCI or the zPCI device. So redirect always to the PCI unplug request handler first and remember if that check has been performed in the zPCI device. Redirect then to the zPCI device unplug request handler to perform the magic. Remembering that we already checked the PCI device breaks the redirect loop. Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20190130155733.32742-5-david@redhat.com> Reviewed-by: Collin Walling <walling@linux.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Cho, Yu-Chen <acho@suse.com> --- hw/s390x/s390-pci-bus.c | 166 +++++++++++++++++++++++++++------------- hw/s390x/s390-pci-bus.h | 1 + 2 files changed, 113 insertions(+), 54 deletions(-) diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c index e077d5d3abcdac272dfe2b4f0d35..aa9a2a5bf4ace5e8cef48b8212e0 100644 --- a/hw/s390x/s390-pci-bus.c +++ b/hw/s390x/s390-pci-bus.c @@ -148,6 +148,22 @@ out: psccb->header.response_code = cpu_to_be16(rc); } +static void s390_pci_perform_unplug(S390PCIBusDevice *pbdev) +{ + HotplugHandler *hotplug_ctrl; + + /* Unplug the PCI device */ + if (pbdev->pdev) { + hotplug_ctrl = qdev_get_hotplug_handler(DEVICE(pbdev->pdev)); + hotplug_handler_unplug(hotplug_ctrl, DEVICE(pbdev->pdev), + &error_abort); + } + + /* Unplug the zPCI device */ + hotplug_ctrl = qdev_get_hotplug_handler(DEVICE(pbdev)); + hotplug_handler_unplug(hotplug_ctrl, DEVICE(pbdev), &error_abort); +} + void s390_pci_sclp_deconfigure(SCCB *sccb) { IoaCfgSccb *psccb = (IoaCfgSccb *)sccb; @@ -179,7 +195,7 @@ void s390_pci_sclp_deconfigure(SCCB *sccb) rc = SCLP_RC_NORMAL_COMPLETION; if (pbdev->release_timer) { - qdev_unplug(DEVICE(pbdev->pdev), NULL); + s390_pci_perform_unplug(pbdev); } } out: @@ -217,6 +233,24 @@ S390PCIBusDevice *s390_pci_find_dev_by_target(S390pciState *s, return NULL; } +static S390PCIBusDevice *s390_pci_find_dev_by_pci(S390pciState *s, + PCIDevice *pci_dev) +{ + S390PCIBusDevice *pbdev; + + if (!pci_dev) { + return NULL; + } + + QTAILQ_FOREACH(pbdev, &s->zpci_devs, link) { + if (pbdev->pdev == pci_dev) { + return pbdev; + } + } + + return NULL; +} + S390PCIBusDevice *s390_pci_find_dev_by_idx(S390pciState *s, uint32_t idx) { return g_hash_table_lookup(s->zpci_table, &idx); @@ -943,77 +977,100 @@ static void s390_pcihost_timer_cb(void *opaque) pbdev->state = ZPCI_FS_STANDBY; s390_pci_generate_plug_event(HP_EVENT_CONFIGURED_TO_STBRES, pbdev->fh, pbdev->fid); - qdev_unplug(DEVICE(pbdev), NULL); + s390_pci_perform_unplug(pbdev); } static void s390_pcihost_unplug(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp) { S390pciState *s = S390_PCI_HOST_BRIDGE(hotplug_dev); - PCIDevice *pci_dev = NULL; - PCIBus *bus; - int32_t devfn; S390PCIBusDevice *pbdev = NULL; + if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) { + PCIDevice *pci_dev = PCI_DEVICE(dev); + PCIBus *bus; + int32_t devfn; + + pbdev = s390_pci_find_dev_by_pci(s, PCI_DEVICE(dev)); + g_assert(pbdev); + + s390_pci_generate_plug_event(HP_EVENT_STANDBY_TO_RESERVED, + pbdev->fh, pbdev->fid); + bus = pci_get_bus(pci_dev); + devfn = pci_dev->devfn; + object_unparent(OBJECT(pci_dev)); + + s390_pci_msix_free(pbdev); + s390_pci_iommu_free(s, bus, devfn); + pbdev->pdev = NULL; + pbdev->state = ZPCI_FS_RESERVED; + } else if (object_dynamic_cast(OBJECT(dev), TYPE_S390_PCI_DEVICE)) { + pbdev = S390_PCI_DEVICE(dev); + + if (pbdev->release_timer) { + timer_del(pbdev->release_timer); + timer_free(pbdev->release_timer); + pbdev->release_timer = NULL; + } + pbdev->fid = 0; + QTAILQ_REMOVE(&s->zpci_devs, pbdev, link); + g_hash_table_remove(s->zpci_table, &pbdev->idx); + object_unparent(OBJECT(pbdev)); + } +} + +static void s390_pcihost_unplug_request(HotplugHandler *hotplug_dev, + DeviceState *dev, + Error **errp) +{ + S390pciState *s = S390_PCI_HOST_BRIDGE(hotplug_dev); + S390PCIBusDevice *pbdev; + if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_BRIDGE)) { error_setg(errp, "PCI bridge hot unplug currently not supported"); - return; } else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) { - pci_dev = PCI_DEVICE(dev); - - QTAILQ_FOREACH(pbdev, &s->zpci_devs, link) { - if (pbdev->pdev == pci_dev) { - break; - } - } - assert(pbdev != NULL); + /* + * Redirect the unplug request to the zPCI device and remember that + * we've checked the PCI device already (to prevent endless recursion). + */ + pbdev = s390_pci_find_dev_by_pci(s, PCI_DEVICE(dev)); + g_assert(pbdev); + pbdev->pci_unplug_request_processed = true; + qdev_unplug(DEVICE(pbdev), errp); } else if (object_dynamic_cast(OBJECT(dev), TYPE_S390_PCI_DEVICE)) { pbdev = S390_PCI_DEVICE(dev); - pci_dev = pbdev->pdev; - } else { - g_assert_not_reached(); - } - switch (pbdev->state) { - case ZPCI_FS_RESERVED: - goto out; - case ZPCI_FS_STANDBY: - break; - default: - if (pbdev->release_timer) { + /* + * If unplug was initially requested for the zPCI device, we + * first have to redirect to the PCI device, which will in return + * redirect back to us after performing its checks (if the request + * is not blocked, e.g. because it's a PCI bridge). + */ + if (pbdev->pdev && !pbdev->pci_unplug_request_processed) { + qdev_unplug(DEVICE(pbdev->pdev), errp); return; } - s390_pci_generate_plug_event(HP_EVENT_DECONFIGURE_REQUEST, - pbdev->fh, pbdev->fid); - pbdev->release_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, - s390_pcihost_timer_cb, - pbdev); - timer_mod(pbdev->release_timer, - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + HOT_UNPLUG_TIMEOUT); - return; - } + pbdev->pci_unplug_request_processed = false; - if (pbdev->release_timer) { - timer_del(pbdev->release_timer); - timer_free(pbdev->release_timer); - pbdev->release_timer = NULL; + switch (pbdev->state) { + case ZPCI_FS_STANDBY: + case ZPCI_FS_RESERVED: + s390_pci_perform_unplug(pbdev); + break; + default: + if (pbdev->release_timer) { + return; + } + s390_pci_generate_plug_event(HP_EVENT_DECONFIGURE_REQUEST, + pbdev->fh, pbdev->fid); + pbdev->release_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, + s390_pcihost_timer_cb, pbdev); + timer_mod(pbdev->release_timer, + qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + HOT_UNPLUG_TIMEOUT); + } + } else { + g_assert_not_reached(); } - - s390_pci_generate_plug_event(HP_EVENT_STANDBY_TO_RESERVED, - pbdev->fh, pbdev->fid); - bus = pci_get_bus(pci_dev); - devfn = pci_dev->devfn; - object_unparent(OBJECT(pci_dev)); - fmb_timer_free(pbdev); - s390_pci_msix_free(pbdev); - s390_pci_iommu_free(s, bus, devfn); - pbdev->pdev = NULL; - pbdev->state = ZPCI_FS_RESERVED; -out: - pbdev->fid = 0; - QTAILQ_REMOVE(&s->zpci_devs, pbdev, link); - g_hash_table_remove(s->zpci_table, &pbdev->idx); - object_unparent(OBJECT(pbdev)); } static void s390_pci_enumerate_bridge(PCIBus *bus, PCIDevice *pdev, @@ -1063,6 +1120,7 @@ static void s390_pcihost_class_init(ObjectClass *klass, void *data) dc->realize = s390_pcihost_realize; hc->pre_plug = s390_pcihost_pre_plug; hc->plug = s390_pcihost_plug; + hc->unplug_request = s390_pcihost_unplug_request; hc->unplug = s390_pcihost_unplug; msi_nonbroken = true; } diff --git a/hw/s390x/s390-pci-bus.h b/hw/s390x/s390-pci-bus.h index 69353efac075e4a95b0a21331724..889e630a9c8e707f126e561b93d8 100644 --- a/hw/s390x/s390-pci-bus.h +++ b/hw/s390x/s390-pci-bus.h @@ -337,6 +337,7 @@ struct S390PCIBusDevice { IndAddr *summary_ind; IndAddr *indicator; QEMUTimer *release_timer; + bool pci_unplug_request_processed; QTAILQ_ENTRY(S390PCIBusDevice) link; };
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