Wu Zongyong | d89c8169 | 2021-10-29 17:14:42 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | |
| 3 | #include "linux/virtio_pci.h" |
| 4 | #include <linux/virtio_pci_legacy.h> |
| 5 | #include <linux/module.h> |
| 6 | #include <linux/pci.h> |
| 7 | |
| 8 | |
| 9 | /* |
| 10 | * vp_legacy_probe: probe the legacy virtio pci device, note that the |
| 11 | * caller is required to enable PCI device before calling this function. |
| 12 | * @ldev: the legacy virtio-pci device |
| 13 | * |
| 14 | * Return 0 on succeed otherwise fail |
| 15 | */ |
| 16 | int vp_legacy_probe(struct virtio_pci_legacy_device *ldev) |
| 17 | { |
| 18 | struct pci_dev *pci_dev = ldev->pci_dev; |
| 19 | int rc; |
| 20 | |
| 21 | /* We only own devices >= 0x1000 and <= 0x103f: leave the rest. */ |
| 22 | if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f) |
| 23 | return -ENODEV; |
| 24 | |
| 25 | if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION) |
| 26 | return -ENODEV; |
| 27 | |
| 28 | rc = dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(64)); |
| 29 | if (rc) { |
| 30 | rc = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(32)); |
| 31 | } else { |
| 32 | /* |
| 33 | * The virtio ring base address is expressed as a 32-bit PFN, |
| 34 | * with a page size of 1 << VIRTIO_PCI_QUEUE_ADDR_SHIFT. |
| 35 | */ |
| 36 | dma_set_coherent_mask(&pci_dev->dev, |
| 37 | DMA_BIT_MASK(32 + VIRTIO_PCI_QUEUE_ADDR_SHIFT)); |
| 38 | } |
| 39 | |
| 40 | if (rc) |
| 41 | dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n"); |
| 42 | |
| 43 | rc = pci_request_region(pci_dev, 0, "virtio-pci-legacy"); |
| 44 | if (rc) |
| 45 | return rc; |
| 46 | |
| 47 | ldev->ioaddr = pci_iomap(pci_dev, 0, 0); |
Peng Hao | 49814ce | 2021-12-22 19:20:14 +0800 | [diff] [blame] | 48 | if (!ldev->ioaddr) { |
| 49 | rc = -EIO; |
Wu Zongyong | d89c8169 | 2021-10-29 17:14:42 +0800 | [diff] [blame] | 50 | goto err_iomap; |
Peng Hao | 49814ce | 2021-12-22 19:20:14 +0800 | [diff] [blame] | 51 | } |
Wu Zongyong | d89c8169 | 2021-10-29 17:14:42 +0800 | [diff] [blame] | 52 | |
| 53 | ldev->isr = ldev->ioaddr + VIRTIO_PCI_ISR; |
| 54 | |
| 55 | ldev->id.vendor = pci_dev->subsystem_vendor; |
| 56 | ldev->id.device = pci_dev->subsystem_device; |
| 57 | |
| 58 | return 0; |
| 59 | err_iomap: |
| 60 | pci_release_region(pci_dev, 0); |
| 61 | return rc; |
| 62 | } |
| 63 | EXPORT_SYMBOL_GPL(vp_legacy_probe); |
| 64 | |
| 65 | /* |
| 66 | * vp_legacy_probe: remove and cleanup the legacy virtio pci device |
| 67 | * @ldev: the legacy virtio-pci device |
| 68 | */ |
| 69 | void vp_legacy_remove(struct virtio_pci_legacy_device *ldev) |
| 70 | { |
| 71 | struct pci_dev *pci_dev = ldev->pci_dev; |
| 72 | |
| 73 | pci_iounmap(pci_dev, ldev->ioaddr); |
| 74 | pci_release_region(pci_dev, 0); |
| 75 | } |
| 76 | EXPORT_SYMBOL_GPL(vp_legacy_remove); |
| 77 | |
| 78 | /* |
| 79 | * vp_legacy_get_features - get features from device |
| 80 | * @ldev: the legacy virtio-pci device |
| 81 | * |
| 82 | * Returns the features read from the device |
| 83 | */ |
| 84 | u64 vp_legacy_get_features(struct virtio_pci_legacy_device *ldev) |
| 85 | { |
| 86 | |
| 87 | return ioread32(ldev->ioaddr + VIRTIO_PCI_HOST_FEATURES); |
| 88 | } |
| 89 | EXPORT_SYMBOL_GPL(vp_legacy_get_features); |
| 90 | |
| 91 | /* |
| 92 | * vp_legacy_get_driver_features - get driver features from device |
| 93 | * @ldev: the legacy virtio-pci device |
| 94 | * |
| 95 | * Returns the driver features read from the device |
| 96 | */ |
| 97 | u64 vp_legacy_get_driver_features(struct virtio_pci_legacy_device *ldev) |
| 98 | { |
| 99 | return ioread32(ldev->ioaddr + VIRTIO_PCI_GUEST_FEATURES); |
| 100 | } |
| 101 | EXPORT_SYMBOL_GPL(vp_legacy_get_driver_features); |
| 102 | |
| 103 | /* |
| 104 | * vp_legacy_set_features - set features to device |
| 105 | * @ldev: the legacy virtio-pci device |
| 106 | * @features: the features set to device |
| 107 | */ |
| 108 | void vp_legacy_set_features(struct virtio_pci_legacy_device *ldev, |
| 109 | u32 features) |
| 110 | { |
| 111 | iowrite32(features, ldev->ioaddr + VIRTIO_PCI_GUEST_FEATURES); |
| 112 | } |
| 113 | EXPORT_SYMBOL_GPL(vp_legacy_set_features); |
| 114 | |
| 115 | /* |
| 116 | * vp_legacy_get_status - get the device status |
| 117 | * @ldev: the legacy virtio-pci device |
| 118 | * |
| 119 | * Returns the status read from device |
| 120 | */ |
| 121 | u8 vp_legacy_get_status(struct virtio_pci_legacy_device *ldev) |
| 122 | { |
| 123 | return ioread8(ldev->ioaddr + VIRTIO_PCI_STATUS); |
| 124 | } |
| 125 | EXPORT_SYMBOL_GPL(vp_legacy_get_status); |
| 126 | |
| 127 | /* |
| 128 | * vp_legacy_set_status - set status to device |
| 129 | * @ldev: the legacy virtio-pci device |
| 130 | * @status: the status set to device |
| 131 | */ |
| 132 | void vp_legacy_set_status(struct virtio_pci_legacy_device *ldev, |
| 133 | u8 status) |
| 134 | { |
| 135 | iowrite8(status, ldev->ioaddr + VIRTIO_PCI_STATUS); |
| 136 | } |
| 137 | EXPORT_SYMBOL_GPL(vp_legacy_set_status); |
| 138 | |
| 139 | /* |
| 140 | * vp_legacy_queue_vector - set the MSIX vector for a specific virtqueue |
| 141 | * @ldev: the legacy virtio-pci device |
| 142 | * @index: queue index |
| 143 | * @vector: the config vector |
| 144 | * |
| 145 | * Returns the config vector read from the device |
| 146 | */ |
| 147 | u16 vp_legacy_queue_vector(struct virtio_pci_legacy_device *ldev, |
| 148 | u16 index, u16 vector) |
| 149 | { |
| 150 | iowrite16(index, ldev->ioaddr + VIRTIO_PCI_QUEUE_SEL); |
| 151 | iowrite16(vector, ldev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR); |
| 152 | /* Flush the write out to device */ |
| 153 | return ioread16(ldev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR); |
| 154 | } |
| 155 | EXPORT_SYMBOL_GPL(vp_legacy_queue_vector); |
| 156 | |
| 157 | /* |
| 158 | * vp_legacy_config_vector - set the vector for config interrupt |
| 159 | * @ldev: the legacy virtio-pci device |
| 160 | * @vector: the config vector |
| 161 | * |
| 162 | * Returns the config vector read from the device |
| 163 | */ |
| 164 | u16 vp_legacy_config_vector(struct virtio_pci_legacy_device *ldev, |
| 165 | u16 vector) |
| 166 | { |
| 167 | /* Setup the vector used for configuration events */ |
| 168 | iowrite16(vector, ldev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR); |
| 169 | /* Verify we had enough resources to assign the vector */ |
| 170 | /* Will also flush the write out to device */ |
| 171 | return ioread16(ldev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR); |
| 172 | } |
| 173 | EXPORT_SYMBOL_GPL(vp_legacy_config_vector); |
| 174 | |
| 175 | /* |
| 176 | * vp_legacy_set_queue_address - set the virtqueue address |
| 177 | * @ldev: the legacy virtio-pci device |
| 178 | * @index: the queue index |
| 179 | * @queue_pfn: pfn of the virtqueue |
| 180 | */ |
| 181 | void vp_legacy_set_queue_address(struct virtio_pci_legacy_device *ldev, |
| 182 | u16 index, u32 queue_pfn) |
| 183 | { |
| 184 | iowrite16(index, ldev->ioaddr + VIRTIO_PCI_QUEUE_SEL); |
| 185 | iowrite32(queue_pfn, ldev->ioaddr + VIRTIO_PCI_QUEUE_PFN); |
| 186 | } |
| 187 | EXPORT_SYMBOL_GPL(vp_legacy_set_queue_address); |
| 188 | |
| 189 | /* |
| 190 | * vp_legacy_get_queue_enable - enable a virtqueue |
| 191 | * @ldev: the legacy virtio-pci device |
| 192 | * @index: the queue index |
| 193 | * |
| 194 | * Returns whether a virtqueue is enabled or not |
| 195 | */ |
| 196 | bool vp_legacy_get_queue_enable(struct virtio_pci_legacy_device *ldev, |
| 197 | u16 index) |
| 198 | { |
| 199 | iowrite16(index, ldev->ioaddr + VIRTIO_PCI_QUEUE_SEL); |
| 200 | return ioread32(ldev->ioaddr + VIRTIO_PCI_QUEUE_PFN); |
| 201 | } |
| 202 | EXPORT_SYMBOL_GPL(vp_legacy_get_queue_enable); |
| 203 | |
| 204 | /* |
| 205 | * vp_legacy_get_queue_size - get size for a virtqueue |
| 206 | * @ldev: the legacy virtio-pci device |
| 207 | * @index: the queue index |
| 208 | * |
| 209 | * Returns the size of the virtqueue |
| 210 | */ |
| 211 | u16 vp_legacy_get_queue_size(struct virtio_pci_legacy_device *ldev, |
| 212 | u16 index) |
| 213 | { |
| 214 | iowrite16(index, ldev->ioaddr + VIRTIO_PCI_QUEUE_SEL); |
| 215 | return ioread16(ldev->ioaddr + VIRTIO_PCI_QUEUE_NUM); |
| 216 | } |
| 217 | EXPORT_SYMBOL_GPL(vp_legacy_get_queue_size); |
| 218 | |
| 219 | MODULE_VERSION("0.1"); |
| 220 | MODULE_DESCRIPTION("Legacy Virtio PCI Device"); |
| 221 | MODULE_AUTHOR("Wu Zongyong <wuzongyong@linux.alibaba.com>"); |
| 222 | MODULE_LICENSE("GPL"); |