2  * Virtio PCI driver - legacy device support
4  * This module allows virtio devices to be used over a virtual PCI device.
16  * See the COPYING file in the top-level directory.
22 /* virtio config->get_features() implementation */
29 	return ioread32(vp_dev->ioaddr + VIRTIO_PCI_HOST_FEATURES);  in vp_get_features()
32 /* virtio config->finalize_features() implementation */
41 	BUG_ON((u32)vdev->features != vdev->features);  in vp_finalize_features()
44 	iowrite32(vdev->features, vp_dev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);  in vp_finalize_features()
49 /* virtio config->get() implementation */
54 	void __iomem *ioaddr = vp_dev->ioaddr +  in vp_get()
63 /* the config->set() implementation.  it's symmetric to the config->get()
69 	void __iomem *ioaddr = vp_dev->ioaddr +  in vp_set()
78 /* config->{get,set}_status() implementations */
82 	return ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);  in vp_get_status()
90 	iowrite8(status, vp_dev->ioaddr + VIRTIO_PCI_STATUS);  in vp_set_status()
97 	iowrite8(0, vp_dev->ioaddr + VIRTIO_PCI_STATUS);  in vp_reset()
99 	 * including MSi-X interrupts, if any. */  in vp_reset()
100 	ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);  in vp_reset()
108 	iowrite16(vector, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);  in vp_config_vector()
111 	return ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);  in vp_config_vector()
128 	iowrite16(index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);  in setup_vq()
131 	num = ioread16(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NUM);  in setup_vq()
132 	if (!num || ioread32(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN))  in setup_vq()
133 		return ERR_PTR(-ENOENT);  in setup_vq()
135 	info->msix_vector = msix_vec;  in setup_vq()
139 				    VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,  in setup_vq()
143 		return ERR_PTR(-ENOMEM);  in setup_vq()
147 		dev_err(&vp_dev->pci_dev->dev,  in setup_vq()
148 			"platform bug: legacy virtio-mmio must not be used with RAM above 0x%llxGB\n",  in setup_vq()
149 			0x1ULL << (32 + PAGE_SHIFT - 30));  in setup_vq()
150 		err = -E2BIG;  in setup_vq()
155 	iowrite32(q_pfn, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);  in setup_vq()
157 	vq->priv = (void __force *)vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY;  in setup_vq()
160 		iowrite16(msix_vec, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);  in setup_vq()
161 		msix_vec = ioread16(vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);  in setup_vq()
163 			err = -EBUSY;  in setup_vq()
171 	iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);  in setup_vq()
179 	struct virtqueue *vq = info->vq;  in del_vq()
180 	struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);  in del_vq()
182 	iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);  in del_vq()
184 	if (vp_dev->msix_enabled) {  in del_vq()
186 			  vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);  in del_vq()
188 		ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);  in del_vq()
192 	iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);  in del_vq()
212 /* the PCI probing function */
215 	struct pci_dev *pci_dev = vp_dev->pci_dev;  in virtio_pci_legacy_probe()
219 	if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f)  in virtio_pci_legacy_probe()
220 		return -ENODEV;  in virtio_pci_legacy_probe()
222 	if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION) {  in virtio_pci_legacy_probe()
224 		       VIRTIO_PCI_ABI_VERSION, pci_dev->revision);  in virtio_pci_legacy_probe()
225 		return -ENODEV;  in virtio_pci_legacy_probe()
228 	rc = dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(64));  in virtio_pci_legacy_probe()
230 		rc = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(32));  in virtio_pci_legacy_probe()
233 		 * The virtio ring base address is expressed as a 32-bit PFN,  in virtio_pci_legacy_probe()
236 		dma_set_coherent_mask(&pci_dev->dev,  in virtio_pci_legacy_probe()
241 …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()
243 	rc = pci_request_region(pci_dev, 0, "virtio-pci-legacy");  in virtio_pci_legacy_probe()
247 	rc = -ENOMEM;  in virtio_pci_legacy_probe()
248 	vp_dev->ioaddr = pci_iomap(pci_dev, 0, 0);  in virtio_pci_legacy_probe()
249 	if (!vp_dev->ioaddr)  in virtio_pci_legacy_probe()
252 	vp_dev->isr = vp_dev->ioaddr + VIRTIO_PCI_ISR;  in virtio_pci_legacy_probe()
254 	/* we use the subsystem vendor/device id as the virtio vendor/device  in virtio_pci_legacy_probe()
255 	 * id.  this allows us to use the same PCI vendor/device id for all  in virtio_pci_legacy_probe()
256 	 * virtio devices and to identify the particular virtio driver by  in virtio_pci_legacy_probe()
258 	vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;  in virtio_pci_legacy_probe()
259 	vp_dev->vdev.id.device = pci_dev->subsystem_device;  in virtio_pci_legacy_probe()
261 	vp_dev->vdev.config = &virtio_pci_config_ops;  in virtio_pci_legacy_probe()
263 	vp_dev->config_vector = vp_config_vector;  in virtio_pci_legacy_probe()
264 	vp_dev->setup_vq = setup_vq;  in virtio_pci_legacy_probe()
265 	vp_dev->del_vq = del_vq;  in virtio_pci_legacy_probe()
276 	struct pci_dev *pci_dev = vp_dev->pci_dev;  in virtio_pci_legacy_remove()
278 	pci_iounmap(pci_dev, vp_dev->ioaddr);  in virtio_pci_legacy_remove()