1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Virtio PCI driver - legacy device support
5  * This module allows virtio devices to be used over a virtual PCI device.
20 /* virtio config->get_features() implementation */
27 	return vp_legacy_get_features(&vp_dev->ldev);  in vp_get_features()
30 /* virtio config->finalize_features() implementation */
39 	BUG_ON((u32)vdev->features != vdev->features);  in vp_finalize_features()
42 	vp_legacy_set_features(&vp_dev->ldev, vdev->features);  in vp_finalize_features()
47 /* virtio config->get() implementation */
52 	void __iomem *ioaddr = vp_dev->ldev.ioaddr +  in vp_get()
53 			VIRTIO_PCI_CONFIG_OFF(vp_dev->msix_enabled) +  in vp_get()
62 /* the config->set() implementation.  it's symmetric to the config->get()
68 	void __iomem *ioaddr = vp_dev->ldev.ioaddr +  in vp_set()
69 			VIRTIO_PCI_CONFIG_OFF(vp_dev->msix_enabled) +  in vp_set()
78 /* config->{get,set}_status() implementations */
82 	return vp_legacy_get_status(&vp_dev->ldev);  in vp_get_status()
90 	vp_legacy_set_status(&vp_dev->ldev, status);  in vp_set_status()
97 	vp_legacy_set_status(&vp_dev->ldev, 0);  in vp_reset()
99 	 * including MSi-X interrupts, if any. */  in vp_reset()
100 	vp_legacy_get_status(&vp_dev->ldev);  in vp_reset()
107 	return vp_legacy_config_vector(&vp_dev->ldev, vector);  in vp_config_vector()
124 	num = vp_legacy_get_queue_size(&vp_dev->ldev, index);  in setup_vq()
125 	if (!num || vp_legacy_get_queue_enable(&vp_dev->ldev, index))  in setup_vq()
126 		return ERR_PTR(-ENOENT);  in setup_vq()
128 	info->msix_vector = msix_vec;  in setup_vq()
132 				    VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,  in setup_vq()
136 		return ERR_PTR(-ENOMEM);  in setup_vq()
138 	vq->num_max = num;  in setup_vq()
142 		dev_err(&vp_dev->pci_dev->dev,  in setup_vq()
143 			"platform bug: legacy virtio-pci must not be used with RAM above 0x%llxGB\n",  in setup_vq()
144 			0x1ULL << (32 + PAGE_SHIFT - 30));  in setup_vq()
145 		err = -E2BIG;  in setup_vq()
150 	vp_legacy_set_queue_address(&vp_dev->ldev, index, q_pfn);  in setup_vq()
152 	vq->priv = (void __force *)vp_dev->ldev.ioaddr + VIRTIO_PCI_QUEUE_NOTIFY;  in setup_vq()
155 		msix_vec = vp_legacy_queue_vector(&vp_dev->ldev, index, msix_vec);  in setup_vq()
157 			err = -EBUSY;  in setup_vq()
165 	vp_legacy_set_queue_address(&vp_dev->ldev, index, 0);  in setup_vq()
173 	struct virtqueue *vq = info->vq;  in del_vq()
174 	struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);  in del_vq()
176 	if (vp_dev->msix_enabled) {  in del_vq()
177 		vp_legacy_queue_vector(&vp_dev->ldev, vq->index,  in del_vq()
180 		ioread8(vp_dev->ldev.ioaddr + VIRTIO_PCI_ISR);  in del_vq()
184 	vp_legacy_set_queue_address(&vp_dev->ldev, vq->index, 0);  in del_vq()
205 /* the PCI probing function */
208 	struct virtio_pci_legacy_device *ldev = &vp_dev->ldev;  in virtio_pci_legacy_probe()
209 	struct pci_dev *pci_dev = vp_dev->pci_dev;  in virtio_pci_legacy_probe()
212 	ldev->pci_dev = pci_dev;  in virtio_pci_legacy_probe()
218 	vp_dev->isr = ldev->isr;  in virtio_pci_legacy_probe()
219 	vp_dev->vdev.id = ldev->id;  in virtio_pci_legacy_probe()
221 	vp_dev->vdev.config = &virtio_pci_config_ops;  in virtio_pci_legacy_probe()
223 	vp_dev->config_vector = vp_config_vector;  in virtio_pci_legacy_probe()
224 	vp_dev->setup_vq = setup_vq;  in virtio_pci_legacy_probe()
225 	vp_dev->del_vq = del_vq;  in virtio_pci_legacy_probe()
226 	vp_dev->is_legacy = true;  in virtio_pci_legacy_probe()
233 	struct virtio_pci_legacy_device *ldev = &vp_dev->ldev;  in virtio_pci_legacy_remove()