hw/i386/xen/xen_pvdevice.c

   1 /* Copyright (c) Citrix Systems Inc.
   2  * All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms,
   5  * with or without modification, are permitted provided
   6  * that the following conditions are met:
   7  *
   8  * *   Redistributions of source code must retain the above
   9  *     copyright notice, this list of conditions and the
  10  *     following disclaimer.
  11  * *   Redistributions in binary form must reproduce the above
  12  *     copyright notice, this list of conditions and the
  13  *     following disclaimer in the documentation and/or other
  14  *     materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  17  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
  21  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  23  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  26  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  27  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include "qemu/osdep.h"
  33 #include "qapi/error.h"
  34 #include "qemu/module.h"
  35 #include "hw/pci/pci_device.h"
  36 #include "hw/qdev-properties.h"
  37 #include "migration/vmstate.h"
  38 #include "trace.h"
  39 #include "qom/object.h"
  40
  41 #define TYPE_XEN_PV_DEVICE  "xen-pvdevice"
  42
  43 OBJECT_DECLARE_SIMPLE_TYPE(XenPVDevice, XEN_PV_DEVICE)
  44
  45 struct XenPVDevice {
  46     /*< private >*/
  47     PCIDevice       parent_obj;
  48     /*< public >*/
  49     uint16_t        vendor_id;
  50     uint16_t        device_id;
  51     uint8_t         revision;
  52     uint32_t        size;
  53     MemoryRegion    mmio;
  54 };
  55
  56 static uint64_t xen_pv_mmio_read(void *opaque, hwaddr addr,
  57                                  unsigned size)
  58 {
  59     trace_xen_pv_mmio_read(addr);
  60
  61     return ~(uint64_t)0;
  62 }
  63
  64 static void xen_pv_mmio_write(void *opaque, hwaddr addr,
  65                               uint64_t val, unsigned size)
  66 {
  67     trace_xen_pv_mmio_write(addr);
  68 }
  69
  70 static const MemoryRegionOps xen_pv_mmio_ops = {
  71     .read = &xen_pv_mmio_read,
  72     .write = &xen_pv_mmio_write,
  73     .endianness = DEVICE_LITTLE_ENDIAN,
  74 };
  75
  76 static const VMStateDescription vmstate_xen_pvdevice = {
  77     .name = "xen-pvdevice",
  78     .version_id = 1,
  79     .minimum_version_id = 1,
  80     .fields = (const VMStateField[]) {
  81         VMSTATE_PCI_DEVICE(parent_obj, XenPVDevice),
  82         VMSTATE_END_OF_LIST()
  83     }
  84 };
  85
  86 static void xen_pv_realize(PCIDevice *pci_dev, Error **errp)
  87 {
  88     XenPVDevice *d = XEN_PV_DEVICE(pci_dev);
  89     uint8_t *pci_conf;
  90
  91     /* device-id property must always be supplied */
  92     if (d->device_id == 0xffff) {
  93         error_setg(errp, "Device ID invalid, it must always be supplied");
  94         return;
  95     }
  96
  97     pci_conf = pci_dev->config;
  98
  99     pci_set_word(pci_conf + PCI_VENDOR_ID, d->vendor_id);
 100     pci_set_word(pci_conf + PCI_SUBSYSTEM_VENDOR_ID, d->vendor_id);
 101     pci_set_word(pci_conf + PCI_DEVICE_ID, d->device_id);
 102     pci_set_word(pci_conf + PCI_SUBSYSTEM_ID, d->device_id);
 103     pci_set_byte(pci_conf + PCI_REVISION_ID, d->revision);
 104
 105     pci_set_word(pci_conf + PCI_COMMAND, PCI_COMMAND_MEMORY);
 106
 107     pci_config_set_prog_interface(pci_conf, 0);
 108
 109     pci_conf[PCI_INTERRUPT_PIN] = 1;
 110
 111     memory_region_init_io(&d->mmio, NULL, &xen_pv_mmio_ops, d,
 112                           "mmio", d->size);
 113
 114     pci_register_bar(pci_dev, 1, PCI_BASE_ADDRESS_MEM_PREFETCH,
 115                      &d->mmio);
 116 }
 117
 118 static Property xen_pv_props[] = {
 119     DEFINE_PROP_UINT16("vendor-id", XenPVDevice, vendor_id, PCI_VENDOR_ID_XEN),
 120     DEFINE_PROP_UINT16("device-id", XenPVDevice, device_id, 0xffff),
 121     DEFINE_PROP_UINT8("revision", XenPVDevice, revision, 0x01),
 122     DEFINE_PROP_UINT32("size", XenPVDevice, size, 0x400000),
 123     DEFINE_PROP_END_OF_LIST()
 124 };
 125
 126 static void xen_pv_class_init(ObjectClass *klass, void *data)
 127 {
 128     DeviceClass *dc = DEVICE_CLASS(klass);
 129     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 130
 131     k->realize = xen_pv_realize;
 132     k->class_id = PCI_CLASS_SYSTEM_OTHER;
 133     dc->desc = "Xen PV Device";
 134     device_class_set_props(dc, xen_pv_props);
 135     dc->vmsd = &vmstate_xen_pvdevice;
 136 }
 137
 138 static const TypeInfo xen_pv_type_info = {
 139     .name          = TYPE_XEN_PV_DEVICE,
 140     .parent        = TYPE_PCI_DEVICE,
 141     .instance_size = sizeof(XenPVDevice),
 142     .class_init    = xen_pv_class_init,
 143     .interfaces = (InterfaceInfo[]) {
 144         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
 145         { },
 146     },
 147 };
 148
 149 static void xen_pv_register_types(void)
 150 {
 151     type_register_static(&xen_pv_type_info);
 152 }
 153
 154 type_init(xen_pv_register_types)