a8ccf8a666
Some SR-IOV PF devices provide no functionality other than acting as a means of enabling VFs. For these devices, we want to enable the VFs and assign them to guest virtual machines, but there's no need to have a driver for the PF itself. Add a new pci-pf-stub driver to claim those PF devices and provide the generic VF enable functionality. An administrator can use the sysfs "sriov_numvfs" file to enable VFs, then assign them to guests. For now I only have one example ID provided by Amazon in terms of devices that require this functionality. The general idea is that in the future we will see other devices added as vendors come up with devices where the PF is more or less just a lightweight shim used to allocate VFs. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> [bhelgaas: changelog] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Greg Rose <gvrose8192@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* pci-pf-stub - simple stub driver for PCI SR-IOV PF device
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*
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* This driver is meant to act as a "whitelist" for devices that provde
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* SR-IOV functionality while at the same time not actually needing a
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* driver of their own.
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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/**
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* pci_pf_stub_whitelist - White list of devices to bind pci-pf-stub onto
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*
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* This table provides the list of IDs this driver is supposed to bind
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* onto. You could think of this as a list of "quirked" devices where we
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* are adding support for SR-IOV here since there are no other drivers
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* that they would be running under.
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*/
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static const struct pci_device_id pci_pf_stub_whitelist[] = {
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{ PCI_VDEVICE(AMAZON, 0x0053) },
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/* required last entry */
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{ 0 }
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};
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MODULE_DEVICE_TABLE(pci, pci_pf_stub_whitelist);
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static int pci_pf_stub_probe(struct pci_dev *dev,
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const struct pci_device_id *id)
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{
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pci_info(dev, "claimed by pci-pf-stub\n");
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return 0;
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}
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static struct pci_driver pf_stub_driver = {
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.name = "pci-pf-stub",
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.id_table = pci_pf_stub_whitelist,
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.probe = pci_pf_stub_probe,
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.sriov_configure = pci_sriov_configure_simple,
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};
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static int __init pci_pf_stub_init(void)
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{
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return pci_register_driver(&pf_stub_driver);
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}
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static void __exit pci_pf_stub_exit(void)
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{
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pci_unregister_driver(&pf_stub_driver);
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}
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module_init(pci_pf_stub_init);
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module_exit(pci_pf_stub_exit);
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MODULE_LICENSE("GPL");
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