223 lines
6.1 KiB
C
223 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include "linux/virtio_pci.h"
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#include <linux/virtio_pci_legacy.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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/*
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* vp_legacy_probe: probe the legacy virtio pci device, note that the
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* caller is required to enable PCI device before calling this function.
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* @ldev: the legacy virtio-pci device
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*
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* Return 0 on succeed otherwise fail
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*/
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int vp_legacy_probe(struct virtio_pci_legacy_device *ldev)
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{
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struct pci_dev *pci_dev = ldev->pci_dev;
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int rc;
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/* We only own devices >= 0x1000 and <= 0x103f: leave the rest. */
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if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f)
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return -ENODEV;
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if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION)
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return -ENODEV;
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rc = dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(64));
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if (rc) {
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rc = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(32));
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} else {
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/*
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* The virtio ring base address is expressed as a 32-bit PFN,
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* with a page size of 1 << VIRTIO_PCI_QUEUE_ADDR_SHIFT.
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*/
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dma_set_coherent_mask(&pci_dev->dev,
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DMA_BIT_MASK(32 + VIRTIO_PCI_QUEUE_ADDR_SHIFT));
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}
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if (rc)
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dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n");
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rc = pci_request_region(pci_dev, 0, "virtio-pci-legacy");
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if (rc)
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return rc;
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ldev->ioaddr = pci_iomap(pci_dev, 0, 0);
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if (!ldev->ioaddr) {
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rc = -EIO;
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goto err_iomap;
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}
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ldev->isr = ldev->ioaddr + VIRTIO_PCI_ISR;
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ldev->id.vendor = pci_dev->subsystem_vendor;
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ldev->id.device = pci_dev->subsystem_device;
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return 0;
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err_iomap:
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pci_release_region(pci_dev, 0);
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return rc;
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}
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EXPORT_SYMBOL_GPL(vp_legacy_probe);
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/*
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* vp_legacy_probe: remove and cleanup the legacy virtio pci device
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* @ldev: the legacy virtio-pci device
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*/
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void vp_legacy_remove(struct virtio_pci_legacy_device *ldev)
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{
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struct pci_dev *pci_dev = ldev->pci_dev;
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pci_iounmap(pci_dev, ldev->ioaddr);
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pci_release_region(pci_dev, 0);
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}
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EXPORT_SYMBOL_GPL(vp_legacy_remove);
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/*
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* vp_legacy_get_features - get features from device
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* @ldev: the legacy virtio-pci device
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*
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* Returns the features read from the device
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*/
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u64 vp_legacy_get_features(struct virtio_pci_legacy_device *ldev)
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{
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return ioread32(ldev->ioaddr + VIRTIO_PCI_HOST_FEATURES);
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}
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EXPORT_SYMBOL_GPL(vp_legacy_get_features);
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/*
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* vp_legacy_get_driver_features - get driver features from device
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* @ldev: the legacy virtio-pci device
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*
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* Returns the driver features read from the device
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*/
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u64 vp_legacy_get_driver_features(struct virtio_pci_legacy_device *ldev)
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{
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return ioread32(ldev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);
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}
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EXPORT_SYMBOL_GPL(vp_legacy_get_driver_features);
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/*
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* vp_legacy_set_features - set features to device
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* @ldev: the legacy virtio-pci device
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* @features: the features set to device
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*/
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void vp_legacy_set_features(struct virtio_pci_legacy_device *ldev,
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u32 features)
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{
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iowrite32(features, ldev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);
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}
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EXPORT_SYMBOL_GPL(vp_legacy_set_features);
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/*
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* vp_legacy_get_status - get the device status
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* @ldev: the legacy virtio-pci device
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*
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* Returns the status read from device
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*/
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u8 vp_legacy_get_status(struct virtio_pci_legacy_device *ldev)
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{
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return ioread8(ldev->ioaddr + VIRTIO_PCI_STATUS);
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}
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EXPORT_SYMBOL_GPL(vp_legacy_get_status);
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/*
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* vp_legacy_set_status - set status to device
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* @ldev: the legacy virtio-pci device
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* @status: the status set to device
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*/
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void vp_legacy_set_status(struct virtio_pci_legacy_device *ldev,
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u8 status)
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{
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iowrite8(status, ldev->ioaddr + VIRTIO_PCI_STATUS);
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}
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EXPORT_SYMBOL_GPL(vp_legacy_set_status);
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/*
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* vp_legacy_queue_vector - set the MSIX vector for a specific virtqueue
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* @ldev: the legacy virtio-pci device
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* @index: queue index
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* @vector: the config vector
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*
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* Returns the config vector read from the device
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*/
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u16 vp_legacy_queue_vector(struct virtio_pci_legacy_device *ldev,
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u16 index, u16 vector)
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{
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iowrite16(index, ldev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
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iowrite16(vector, ldev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
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/* Flush the write out to device */
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return ioread16(ldev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
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}
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EXPORT_SYMBOL_GPL(vp_legacy_queue_vector);
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/*
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* vp_legacy_config_vector - set the vector for config interrupt
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* @ldev: the legacy virtio-pci device
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* @vector: the config vector
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*
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* Returns the config vector read from the device
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*/
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u16 vp_legacy_config_vector(struct virtio_pci_legacy_device *ldev,
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u16 vector)
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{
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/* Setup the vector used for configuration events */
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iowrite16(vector, ldev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
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/* Verify we had enough resources to assign the vector */
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/* Will also flush the write out to device */
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return ioread16(ldev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
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}
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EXPORT_SYMBOL_GPL(vp_legacy_config_vector);
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/*
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* vp_legacy_set_queue_address - set the virtqueue address
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* @ldev: the legacy virtio-pci device
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* @index: the queue index
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* @queue_pfn: pfn of the virtqueue
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*/
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void vp_legacy_set_queue_address(struct virtio_pci_legacy_device *ldev,
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u16 index, u32 queue_pfn)
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{
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iowrite16(index, ldev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
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iowrite32(queue_pfn, ldev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
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}
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EXPORT_SYMBOL_GPL(vp_legacy_set_queue_address);
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/*
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* vp_legacy_get_queue_enable - enable a virtqueue
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* @ldev: the legacy virtio-pci device
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* @index: the queue index
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*
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* Returns whether a virtqueue is enabled or not
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*/
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bool vp_legacy_get_queue_enable(struct virtio_pci_legacy_device *ldev,
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u16 index)
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{
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iowrite16(index, ldev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
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return ioread32(ldev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
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}
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EXPORT_SYMBOL_GPL(vp_legacy_get_queue_enable);
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/*
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* vp_legacy_get_queue_size - get size for a virtqueue
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* @ldev: the legacy virtio-pci device
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* @index: the queue index
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*
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* Returns the size of the virtqueue
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*/
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u16 vp_legacy_get_queue_size(struct virtio_pci_legacy_device *ldev,
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u16 index)
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{
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iowrite16(index, ldev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
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return ioread16(ldev->ioaddr + VIRTIO_PCI_QUEUE_NUM);
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}
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EXPORT_SYMBOL_GPL(vp_legacy_get_queue_size);
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MODULE_VERSION("0.1");
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MODULE_DESCRIPTION("Legacy Virtio PCI Device");
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MODULE_AUTHOR("Wu Zongyong <wuzongyong@linux.alibaba.com>");
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MODULE_LICENSE("GPL");
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