qemu

FORK: QEMU emulator
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virtio-iommu.c (3698B)

      1 /*
      2  * libqos driver virtio-iommu-pci framework
      3  *
      4  * Copyright (c) 2021 Red Hat, Inc.
      5  *
      6  * Authors:
      7  *  Eric Auger <eric.auger@redhat.com>
      8  *
      9  * This work is licensed under the terms of the GNU GPL, version 2 or (at your
     10  * option) any later version.  See the COPYING file in the top-level directory.
     11  *
     12  */
     13 
     14 #include "qemu/osdep.h"
     15 #include "../libqtest.h"
     16 #include "qemu/module.h"
     17 #include "qgraph.h"
     18 #include "virtio-iommu.h"
     19 #include "hw/virtio/virtio-iommu.h"
     20 
     21 static QGuestAllocator *alloc;
     22 
     23 /* virtio-iommu-device */
     24 static void *qvirtio_iommu_get_driver(QVirtioIOMMU *v_iommu,
     25                                       const char *interface)
     26 {
     27     if (!g_strcmp0(interface, "virtio-iommu")) {
     28         return v_iommu;
     29     }
     30     if (!g_strcmp0(interface, "virtio")) {
     31         return v_iommu->vdev;
     32     }
     33 
     34     fprintf(stderr, "%s not present in virtio-iommu-device\n", interface);
     35     g_assert_not_reached();
     36 }
     37 
     38 static void virtio_iommu_cleanup(QVirtioIOMMU *interface)
     39 {
     40     qvirtqueue_cleanup(interface->vdev->bus, interface->vq, alloc);
     41 }
     42 
     43 static void virtio_iommu_setup(QVirtioIOMMU *interface)
     44 {
     45     QVirtioDevice *vdev = interface->vdev;
     46     uint64_t features;
     47 
     48     features = qvirtio_get_features(vdev);
     49     features &= ~(QVIRTIO_F_BAD_FEATURE |
     50                   (1ull << VIRTIO_RING_F_INDIRECT_DESC) |
     51                   (1ull << VIRTIO_RING_F_EVENT_IDX) |
     52                   (1ull << VIRTIO_IOMMU_F_BYPASS));
     53     qvirtio_set_features(vdev, features);
     54     interface->vq = qvirtqueue_setup(interface->vdev, alloc, 0);
     55     qvirtio_set_driver_ok(interface->vdev);
     56 }
     57 
     58 /* virtio-iommu-pci */
     59 static void *qvirtio_iommu_pci_get_driver(void *object, const char *interface)
     60 {
     61     QVirtioIOMMUPCI *v_iommu = object;
     62     if (!g_strcmp0(interface, "pci-device")) {
     63         return v_iommu->pci_vdev.pdev;
     64     }
     65     return qvirtio_iommu_get_driver(&v_iommu->iommu, interface);
     66 }
     67 
     68 static void qvirtio_iommu_pci_destructor(QOSGraphObject *obj)
     69 {
     70     QVirtioIOMMUPCI *iommu_pci = (QVirtioIOMMUPCI *) obj;
     71     QVirtioIOMMU *interface = &iommu_pci->iommu;
     72     QOSGraphObject *pci_vobj =  &iommu_pci->pci_vdev.obj;
     73 
     74     virtio_iommu_cleanup(interface);
     75     qvirtio_pci_destructor(pci_vobj);
     76 }
     77 
     78 static void qvirtio_iommu_pci_start_hw(QOSGraphObject *obj)
     79 {
     80     QVirtioIOMMUPCI *iommu_pci = (QVirtioIOMMUPCI *) obj;
     81     QVirtioIOMMU *interface = &iommu_pci->iommu;
     82     QOSGraphObject *pci_vobj =  &iommu_pci->pci_vdev.obj;
     83 
     84     qvirtio_pci_start_hw(pci_vobj);
     85     virtio_iommu_setup(interface);
     86 }
     87 
     88 
     89 static void *virtio_iommu_pci_create(void *pci_bus, QGuestAllocator *t_alloc,
     90                                    void *addr)
     91 {
     92     QVirtioIOMMUPCI *virtio_rpci = g_new0(QVirtioIOMMUPCI, 1);
     93     QVirtioIOMMU *interface = &virtio_rpci->iommu;
     94     QOSGraphObject *obj = &virtio_rpci->pci_vdev.obj;
     95 
     96     virtio_pci_init(&virtio_rpci->pci_vdev, pci_bus, addr);
     97     interface->vdev = &virtio_rpci->pci_vdev.vdev;
     98     alloc = t_alloc;
     99 
    100     obj->get_driver = qvirtio_iommu_pci_get_driver;
    101     obj->start_hw = qvirtio_iommu_pci_start_hw;
    102     obj->destructor = qvirtio_iommu_pci_destructor;
    103 
    104     return obj;
    105 }
    106 
    107 static void virtio_iommu_register_nodes(void)
    108 {
    109     QPCIAddress addr = {
    110         .devfn = QPCI_DEVFN(4, 0),
    111     };
    112 
    113     QOSGraphEdgeOptions opts = {
    114         .extra_device_opts = "addr=04.0",
    115     };
    116 
    117     /* virtio-iommu-pci */
    118     add_qpci_address(&opts, &addr);
    119     qos_node_create_driver("virtio-iommu-pci", virtio_iommu_pci_create);
    120     qos_node_consumes("virtio-iommu-pci", "pci-bus", &opts);
    121     qos_node_produces("virtio-iommu-pci", "pci-device");
    122     qos_node_produces("virtio-iommu-pci", "virtio");
    123     qos_node_produces("virtio-iommu-pci", "virtio-iommu");
    124 }
    125 
    126 libqos_init(virtio_iommu_register_nodes);