hyperv-fb: add pci stub (7ad96847) · Commits · 戴 / test

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>

drivers/video/hyperv_fb.c

+39 −1

Original line number	Diff line number	Diff line
		@@ -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);
		}

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