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.
19 /* virtio config->get_features() implementation */
26 	return ioread32(vp_dev->ioaddr + VIRTIO_PCI_HOST_FEATURES);  in vp_get_features()
29 /* virtio config->finalize_features() implementation */
38 	BUG_ON((u32)vdev->features != vdev->features);  in vp_finalize_features()
41 	iowrite32(vdev->features, vp_dev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);  in vp_finalize_features()
46 /* virtio config->get() implementation */
51 	void __iomem *ioaddr = vp_dev->ioaddr +  in vp_get()
52 			VIRTIO_PCI_CONFIG_OFF(vp_dev->msix_enabled) +  in vp_get()
61 /* the config->set() implementation.  it's symmetric to the config->get()
67 	void __iomem *ioaddr = vp_dev->ioaddr +  in vp_set()
68 			VIRTIO_PCI_CONFIG_OFF(vp_dev->msix_enabled) +  in vp_set()
77 /* config->{get,set}_status() implementations */
81 	return ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);  in vp_get_status()
89 	iowrite8(status, vp_dev->ioaddr + VIRTIO_PCI_STATUS);  in vp_set_status()
96 	iowrite8(0, vp_dev->ioaddr + VIRTIO_PCI_STATUS);  in vp_reset()
98 	 * including MSi-X interrupts, if any. */  in vp_reset()
99 	ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);  in vp_reset()
107 	iowrite16(vector, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);  in vp_config_vector()
110 	return ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);  in vp_config_vector()
127 	iowrite16(index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);  in setup_vq()
130 	num = ioread16(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NUM);  in setup_vq()
131 	if (!num || ioread32(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN))  in setup_vq()
132 		return ERR_PTR(-ENOENT);  in setup_vq()
134 	info->msix_vector = msix_vec;  in setup_vq()
138 				    VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,  in setup_vq()
142 		return ERR_PTR(-ENOMEM);  in setup_vq()
146 		dev_err(&vp_dev->pci_dev->dev,  in setup_vq()
147 			"platform bug: legacy virtio-mmio must not be used with RAM above 0x%llxGB\n",  in setup_vq()
148 			0x1ULL << (32 + PAGE_SHIFT - 30));  in setup_vq()
149 		err = -E2BIG;  in setup_vq()
154 	iowrite32(q_pfn, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);  in setup_vq()
156 	vq->priv = (void __force *)vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY;  in setup_vq()
159 		iowrite16(msix_vec, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);  in setup_vq()
160 		msix_vec = ioread16(vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);  in setup_vq()
162 			err = -EBUSY;  in setup_vq()
170 	iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);  in setup_vq()
178 	struct virtqueue *vq = info->vq;  in del_vq()
179 	struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);  in del_vq()
181 	iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);  in del_vq()
183 	if (vp_dev->msix_enabled) {  in del_vq()
185 			  vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);  in del_vq()
187 		ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);  in del_vq()
191 	iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);  in del_vq()
211 /* the PCI probing function */
214 	struct pci_dev *pci_dev = vp_dev->pci_dev;  in virtio_pci_legacy_probe()
218 	if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f)  in virtio_pci_legacy_probe()
219 		return -ENODEV;  in virtio_pci_legacy_probe()
221 	if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION) {  in virtio_pci_legacy_probe()
223 		       VIRTIO_PCI_ABI_VERSION, pci_dev->revision);  in virtio_pci_legacy_probe()
224 		return -ENODEV;  in virtio_pci_legacy_probe()
227 	rc = dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(64));  in virtio_pci_legacy_probe()
229 		rc = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(32));  in virtio_pci_legacy_probe()
232 		 * The virtio ring base address is expressed as a 32-bit PFN,  in virtio_pci_legacy_probe()
235 		dma_set_coherent_mask(&pci_dev->dev,  in virtio_pci_legacy_probe()
240 …dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA.  Trying to continue, but this migh…  in virtio_pci_legacy_probe()
242 	rc = pci_request_region(pci_dev, 0, "virtio-pci-legacy");  in virtio_pci_legacy_probe()
246 	rc = -ENOMEM;  in virtio_pci_legacy_probe()
247 	vp_dev->ioaddr = pci_iomap(pci_dev, 0, 0);  in virtio_pci_legacy_probe()
248 	if (!vp_dev->ioaddr)  in virtio_pci_legacy_probe()
251 	vp_dev->isr = vp_dev->ioaddr + VIRTIO_PCI_ISR;  in virtio_pci_legacy_probe()
253 	/* we use the subsystem vendor/device id as the virtio vendor/device  in virtio_pci_legacy_probe()
254 	 * id.  this allows us to use the same PCI vendor/device id for all  in virtio_pci_legacy_probe()
255 	 * virtio devices and to identify the particular virtio driver by  in virtio_pci_legacy_probe()
257 	vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;  in virtio_pci_legacy_probe()
258 	vp_dev->vdev.id.device = pci_dev->subsystem_device;  in virtio_pci_legacy_probe()
260 	vp_dev->vdev.config = &virtio_pci_config_ops;  in virtio_pci_legacy_probe()
262 	vp_dev->config_vector = vp_config_vector;  in virtio_pci_legacy_probe()
263 	vp_dev->setup_vq = setup_vq;  in virtio_pci_legacy_probe()
264 	vp_dev->del_vq = del_vq;  in virtio_pci_legacy_probe()
275 	struct pci_dev *pci_dev = vp_dev->pci_dev;  in virtio_pci_legacy_remove()
277 	pci_iounmap(pci_dev, vp_dev->ioaddr);  in virtio_pci_legacy_remove()