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hyperv-fb: add pci stub

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This patch adds a pci stub driver to hyper-fb.  The hyperv framebuffer
driver will bind to the pci device then, so linux kernel and userspace
know there is a proper kernel driver for the device active.  lspci shows
this for example:

[root@dhcp231 ~]# lspci -vs8
00:08.0 VGA compatible controller: Microsoft Corporation Hyper-V virtual
VGA (prog-if 00 [VGA controller])
        Flags: bus master, fast devsel, latency 0, IRQ 11
        Memory at f8000000 (32-bit, non-prefetchable) [size=64M]
        Expansion ROM at <unassigned> [disabled]
        Kernel driver in use: hyperv_fb

Another effect is that the xorg vesa driver will not attach to the
device and thus the Xorg server will automatically use the fbdev
driver instead.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Gerd Hoffmann 2013-10-02 13:55:10 +02:00 committed by Tomi Valkeinen
parent 7831b2ae4a
commit 7ad9684721
1 changed files with 39 additions and 1 deletions
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40
drivers/video/hyperv_fb.c
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@ -795,12 +795,21 @@ static int hvfb_remove(struct hv_device *hdev)
}
static DEFINE_PCI_DEVICE_TABLE(pci_stub_id_table) = {
{
.vendor = PCI_VENDOR_ID_MICROSOFT,
.device = PCI_DEVICE_ID_HYPERV_VIDEO,
},
{ /* end of list */ }
};
static const struct hv_vmbus_device_id id_table[] = {
/* Synthetic Video Device GUID */
{HV_SYNTHVID_GUID},
{}
};
MODULE_DEVICE_TABLE(pci, pci_stub_id_table);
MODULE_DEVICE_TABLE(vmbus, id_table);
static struct hv_driver hvfb_drv = {
@ -810,14 +819,43 @@ static struct hv_driver hvfb_drv = {
.remove = hvfb_remove,
};
static int hvfb_pci_stub_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
return 0;
}
static void hvfb_pci_stub_remove(struct pci_dev *pdev)
{
}
static struct pci_driver hvfb_pci_stub_driver = {
.name = KBUILD_MODNAME,
.id_table = pci_stub_id_table,
.probe = hvfb_pci_stub_probe,
.remove = hvfb_pci_stub_remove,
};
static int __init hvfb_drv_init(void)
{
return vmbus_driver_register(&hvfb_drv);
int ret;
ret = vmbus_driver_register(&hvfb_drv);
if (ret != 0)
return ret;
ret = pci_register_driver(&hvfb_pci_stub_driver);
if (ret != 0) {
vmbus_driver_unregister(&hvfb_drv);
return ret;
}
return 0;
}
static void __exit hvfb_drv_exit(void)
{
pci_unregister_driver(&hvfb_pci_stub_driver);
vmbus_driver_unregister(&hvfb_drv);
}