539891a85d
The intention of the Xen PV device is that it is used as a parent device for PV drivers in Xen HVM guests and the set of PV drivers that bind to the device is determined by its device ID (and possibly vendor ID and revision). As such, the device should not have a default device ID, it should always be supplied by the Xen toolstack. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
136 lines
4.1 KiB
C
136 lines
4.1 KiB
C
/* Copyright (c) Citrix Systems Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms,
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* with or without modification, are permitted provided
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* that the following conditions are met:
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*
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* * Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the
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* following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "hw/hw.h"
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#include "hw/pci/pci.h"
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#include "trace.h"
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#define TYPE_XEN_PV_DEVICE "xen-pvdevice"
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#define XEN_PV_DEVICE(obj) \
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OBJECT_CHECK(XenPVDevice, (obj), TYPE_XEN_PV_DEVICE)
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typedef struct XenPVDevice {
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/*< private >*/
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PCIDevice parent_obj;
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/*< public >*/
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uint16_t vendor_id;
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uint16_t device_id;
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uint8_t revision;
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uint32_t size;
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MemoryRegion mmio;
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} XenPVDevice;
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static uint64_t xen_pv_mmio_read(void *opaque, hwaddr addr,
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unsigned size)
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{
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trace_xen_pv_mmio_read(addr);
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return ~(uint64_t)0;
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}
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static void xen_pv_mmio_write(void *opaque, hwaddr addr,
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uint64_t val, unsigned size)
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{
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trace_xen_pv_mmio_write(addr);
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}
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static const MemoryRegionOps xen_pv_mmio_ops = {
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.read = &xen_pv_mmio_read,
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.write = &xen_pv_mmio_write,
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.endianness = DEVICE_LITTLE_ENDIAN,
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};
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static int xen_pv_init(PCIDevice *pci_dev)
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{
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XenPVDevice *d = XEN_PV_DEVICE(pci_dev);
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uint8_t *pci_conf;
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/* device-id property must always be supplied */
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if (d->device_id == 0xffff)
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return -1;
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pci_conf = pci_dev->config;
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pci_set_word(pci_conf + PCI_VENDOR_ID, d->vendor_id);
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pci_set_word(pci_conf + PCI_SUBSYSTEM_VENDOR_ID, d->vendor_id);
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pci_set_word(pci_conf + PCI_DEVICE_ID, d->device_id);
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pci_set_word(pci_conf + PCI_SUBSYSTEM_ID, d->device_id);
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pci_set_byte(pci_conf + PCI_REVISION_ID, d->revision);
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pci_set_word(pci_conf + PCI_COMMAND, PCI_COMMAND_MEMORY);
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pci_config_set_prog_interface(pci_conf, 0);
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pci_conf[PCI_INTERRUPT_PIN] = 1;
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memory_region_init_io(&d->mmio, NULL, &xen_pv_mmio_ops, d,
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"mmio", d->size);
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pci_register_bar(pci_dev, 1, PCI_BASE_ADDRESS_MEM_PREFETCH,
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&d->mmio);
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return 0;
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}
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static Property xen_pv_props[] = {
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DEFINE_PROP_UINT16("vendor-id", XenPVDevice, vendor_id, PCI_VENDOR_ID_XEN),
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DEFINE_PROP_UINT16("device-id", XenPVDevice, device_id, 0xffff),
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DEFINE_PROP_UINT8("revision", XenPVDevice, revision, 0x01),
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DEFINE_PROP_UINT32("size", XenPVDevice, size, 0x400000),
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DEFINE_PROP_END_OF_LIST()
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};
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static void xen_pv_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->init = xen_pv_init;
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k->class_id = PCI_CLASS_SYSTEM_OTHER;
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dc->desc = "Xen PV Device";
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dc->props = xen_pv_props;
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}
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static const TypeInfo xen_pv_type_info = {
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.name = TYPE_XEN_PV_DEVICE,
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.parent = TYPE_PCI_DEVICE,
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.instance_size = sizeof(XenPVDevice),
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.class_init = xen_pv_class_init,
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};
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static void xen_pv_register_types(void)
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{
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type_register_static(&xen_pv_type_info);
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}
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type_init(xen_pv_register_types)
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