qemu

FORK: QEMU emulator
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virtio-scsi.c (3943B)

      1 /*
      2  * libqos driver framework
      3  *
      4  * Copyright (c) 2018 Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com>
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Lesser General Public
      8  * License version 2.1 as published by the Free Software Foundation.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Lesser General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Lesser General Public
     16  * License along with this library; if not, see <http://www.gnu.org/licenses/>
     17  */
     18 
     19 #include "qemu/osdep.h"
     20 #include "../libqtest.h"
     21 #include "qemu/module.h"
     22 #include "standard-headers/linux/virtio_ids.h"
     23 #include "qgraph.h"
     24 #include "virtio-scsi.h"
     25 
     26 /* virtio-scsi-device */
     27 static void *qvirtio_scsi_get_driver(QVirtioSCSI *v_scsi,
     28                                      const char *interface)
     29 {
     30     if (!g_strcmp0(interface, "virtio-scsi")) {
     31         return v_scsi;
     32     }
     33     if (!g_strcmp0(interface, "virtio")) {
     34         return v_scsi->vdev;
     35     }
     36 
     37     fprintf(stderr, "%s not present in virtio-scsi-device\n", interface);
     38     g_assert_not_reached();
     39 }
     40 
     41 static void *qvirtio_scsi_device_get_driver(void *object,
     42                                             const char *interface)
     43 {
     44     QVirtioSCSIDevice *v_scsi = object;
     45     return qvirtio_scsi_get_driver(&v_scsi->scsi, interface);
     46 }
     47 
     48 static void *virtio_scsi_device_create(void *virtio_dev,
     49                                           QGuestAllocator *t_alloc,
     50                                           void *addr)
     51 {
     52     QVirtioSCSIDevice *virtio_bdevice = g_new0(QVirtioSCSIDevice, 1);
     53     QVirtioSCSI *interface = &virtio_bdevice->scsi;
     54 
     55     interface->vdev = virtio_dev;
     56 
     57     virtio_bdevice->obj.get_driver = qvirtio_scsi_device_get_driver;
     58 
     59     return &virtio_bdevice->obj;
     60 }
     61 
     62 /* virtio-scsi-pci */
     63 static void *qvirtio_scsi_pci_get_driver(void *object,
     64                                          const char *interface)
     65 {
     66     QVirtioSCSIPCI *v_scsi = object;
     67     if (!g_strcmp0(interface, "pci-device")) {
     68         return v_scsi->pci_vdev.pdev;
     69     }
     70     return qvirtio_scsi_get_driver(&v_scsi->scsi, interface);
     71 }
     72 
     73 static void *virtio_scsi_pci_create(void *pci_bus,
     74                                     QGuestAllocator *t_alloc,
     75                                     void *addr)
     76 {
     77     QVirtioSCSIPCI *virtio_spci = g_new0(QVirtioSCSIPCI, 1);
     78     QVirtioSCSI *interface = &virtio_spci->scsi;
     79     QOSGraphObject *obj = &virtio_spci->pci_vdev.obj;
     80 
     81     virtio_pci_init(&virtio_spci->pci_vdev, pci_bus, addr);
     82     interface->vdev = &virtio_spci->pci_vdev.vdev;
     83 
     84     g_assert_cmphex(interface->vdev->device_type, ==, VIRTIO_ID_SCSI);
     85 
     86     obj->get_driver = qvirtio_scsi_pci_get_driver;
     87 
     88     return obj;
     89 }
     90 
     91 static void virtio_scsi_register_nodes(void)
     92 {
     93     QPCIAddress addr = {
     94         .devfn = QPCI_DEVFN(4, 0),
     95     };
     96 
     97     QOSGraphEdgeOptions opts = {
     98         .before_cmd_line = "-drive id=drv0,if=none,file=null-co://,"
     99                            "file.read-zeroes=on,format=raw",
    100         .after_cmd_line = "-device scsi-hd,bus=vs0.0,drive=drv0",
    101     };
    102 
    103     /* virtio-scsi-device */
    104     opts.extra_device_opts = "id=vs0";
    105     qos_node_create_driver("virtio-scsi-device",
    106                             virtio_scsi_device_create);
    107     qos_node_consumes("virtio-scsi-device", "virtio-bus", &opts);
    108     qos_node_produces("virtio-scsi-device", "virtio-scsi");
    109 
    110     /* virtio-scsi-pci */
    111     opts.extra_device_opts = "id=vs0,addr=04.0";
    112     add_qpci_address(&opts, &addr);
    113     qos_node_create_driver("virtio-scsi-pci", virtio_scsi_pci_create);
    114     qos_node_consumes("virtio-scsi-pci", "pci-bus", &opts);
    115     qos_node_produces("virtio-scsi-pci", "pci-device");
    116     qos_node_produces("virtio-scsi-pci", "virtio-scsi");
    117 }
    118 
    119 libqos_init(virtio_scsi_register_nodes);