| // SPDX-License-Identifier: GPL-2.0-or-later |
| |
| #include <linux/virtio_pci_modern.h> |
| #include <linux/module.h> |
| #include <linux/pci.h> |
| #include <linux/delay.h> |
| |
| /* |
| * vp_modern_map_capability - map a part of virtio pci capability |
| * @mdev: the modern virtio-pci device |
| * @off: offset of the capability |
| * @minlen: minimal length of the capability |
| * @align: align requirement |
| * @start: start from the capability |
| * @size: map size |
| * @len: the length that is actually mapped |
| * @pa: physical address of the capability |
| * |
| * Returns the io address of for the part of the capability |
| */ |
| static void __iomem * |
| vp_modern_map_capability(struct virtio_pci_modern_device *mdev, int off, |
| size_t minlen, u32 align, u32 start, u32 size, |
| size_t *len, resource_size_t *pa) |
| { |
| struct pci_dev *dev = mdev->pci_dev; |
| u8 bar; |
| u32 offset, length; |
| void __iomem *p; |
| |
| pci_read_config_byte(dev, off + offsetof(struct virtio_pci_cap, |
| bar), |
| &bar); |
| pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, offset), |
| &offset); |
| pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, length), |
| &length); |
| |
| /* Check if the BAR may have changed since we requested the region. */ |
| if (bar >= PCI_STD_NUM_BARS || !(mdev->modern_bars & (1 << bar))) { |
| dev_err(&dev->dev, |
| "virtio_pci: bar unexpectedly changed to %u\n", bar); |
| return NULL; |
| } |
| |
| if (length <= start) { |
| dev_err(&dev->dev, |
| "virtio_pci: bad capability len %u (>%u expected)\n", |
| length, start); |
| return NULL; |
| } |
| |
| if (length - start < minlen) { |
| dev_err(&dev->dev, |
| "virtio_pci: bad capability len %u (>=%zu expected)\n", |
| length, minlen); |
| return NULL; |
| } |
| |
| length -= start; |
| |
| if (start + offset < offset) { |
| dev_err(&dev->dev, |
| "virtio_pci: map wrap-around %u+%u\n", |
| start, offset); |
| return NULL; |
| } |
| |
| offset += start; |
| |
| if (offset & (align - 1)) { |
| dev_err(&dev->dev, |
| "virtio_pci: offset %u not aligned to %u\n", |
| offset, align); |
| return NULL; |
| } |
| |
| if (length > size) |
| length = size; |
| |
| if (len) |
| *len = length; |
| |
| if (minlen + offset < minlen || |
| minlen + offset > pci_resource_len(dev, bar)) { |
| dev_err(&dev->dev, |
| "virtio_pci: map virtio %zu@%u " |
| "out of range on bar %i length %lu\n", |
| minlen, offset, |
| bar, (unsigned long)pci_resource_len(dev, bar)); |
| return NULL; |
| } |
| |
| p = pci_iomap_range(dev, bar, offset, length); |
| if (!p) |
| dev_err(&dev->dev, |
| "virtio_pci: unable to map virtio %u@%u on bar %i\n", |
| length, offset, bar); |
| else if (pa) |
| *pa = pci_resource_start(dev, bar) + offset; |
| |
| return p; |
| } |
| |
| /** |
| * virtio_pci_find_capability - walk capabilities to find device info. |
| * @dev: the pci device |
| * @cfg_type: the VIRTIO_PCI_CAP_* value we seek |
| * @ioresource_types: IORESOURCE_MEM and/or IORESOURCE_IO. |
| * @bars: the bitmask of BARs |
| * |
| * Returns offset of the capability, or 0. |
| */ |
| static inline int virtio_pci_find_capability(struct pci_dev *dev, u8 cfg_type, |
| u32 ioresource_types, int *bars) |
| { |
| int pos; |
| |
| for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR); |
| pos > 0; |
| pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) { |
| u8 type, bar; |
| pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, |
| cfg_type), |
| &type); |
| pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, |
| bar), |
| &bar); |
| |
| /* Ignore structures with reserved BAR values */ |
| if (bar >= PCI_STD_NUM_BARS) |
| continue; |
| |
| if (type == cfg_type) { |
| if (pci_resource_len(dev, bar) && |
| pci_resource_flags(dev, bar) & ioresource_types) { |
| *bars |= (1 << bar); |
| return pos; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| /* This is part of the ABI. Don't screw with it. */ |
| static inline void check_offsets(void) |
| { |
| /* Note: disk space was harmed in compilation of this function. */ |
| BUILD_BUG_ON(VIRTIO_PCI_CAP_VNDR != |
| offsetof(struct virtio_pci_cap, cap_vndr)); |
| BUILD_BUG_ON(VIRTIO_PCI_CAP_NEXT != |
| offsetof(struct virtio_pci_cap, cap_next)); |
| BUILD_BUG_ON(VIRTIO_PCI_CAP_LEN != |
| offsetof(struct virtio_pci_cap, cap_len)); |
| BUILD_BUG_ON(VIRTIO_PCI_CAP_CFG_TYPE != |
| offsetof(struct virtio_pci_cap, cfg_type)); |
| BUILD_BUG_ON(VIRTIO_PCI_CAP_BAR != |
| offsetof(struct virtio_pci_cap, bar)); |
| BUILD_BUG_ON(VIRTIO_PCI_CAP_OFFSET != |
| offsetof(struct virtio_pci_cap, offset)); |
| BUILD_BUG_ON(VIRTIO_PCI_CAP_LENGTH != |
| offsetof(struct virtio_pci_cap, length)); |
| BUILD_BUG_ON(VIRTIO_PCI_NOTIFY_CAP_MULT != |
| offsetof(struct virtio_pci_notify_cap, |
| notify_off_multiplier)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_DFSELECT != |
| offsetof(struct virtio_pci_common_cfg, |
| device_feature_select)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_DF != |
| offsetof(struct virtio_pci_common_cfg, device_feature)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_GFSELECT != |
| offsetof(struct virtio_pci_common_cfg, |
| guest_feature_select)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_GF != |
| offsetof(struct virtio_pci_common_cfg, guest_feature)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_MSIX != |
| offsetof(struct virtio_pci_common_cfg, msix_config)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_NUMQ != |
| offsetof(struct virtio_pci_common_cfg, num_queues)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_STATUS != |
| offsetof(struct virtio_pci_common_cfg, device_status)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_CFGGENERATION != |
| offsetof(struct virtio_pci_common_cfg, config_generation)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SELECT != |
| offsetof(struct virtio_pci_common_cfg, queue_select)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SIZE != |
| offsetof(struct virtio_pci_common_cfg, queue_size)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_MSIX != |
| offsetof(struct virtio_pci_common_cfg, queue_msix_vector)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_ENABLE != |
| offsetof(struct virtio_pci_common_cfg, queue_enable)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_NOFF != |
| offsetof(struct virtio_pci_common_cfg, queue_notify_off)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCLO != |
| offsetof(struct virtio_pci_common_cfg, queue_desc_lo)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCHI != |
| offsetof(struct virtio_pci_common_cfg, queue_desc_hi)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILLO != |
| offsetof(struct virtio_pci_common_cfg, queue_avail_lo)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILHI != |
| offsetof(struct virtio_pci_common_cfg, queue_avail_hi)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDLO != |
| offsetof(struct virtio_pci_common_cfg, queue_used_lo)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDHI != |
| offsetof(struct virtio_pci_common_cfg, queue_used_hi)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_NDATA != |
| offsetof(struct virtio_pci_modern_common_cfg, queue_notify_data)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_RESET != |
| offsetof(struct virtio_pci_modern_common_cfg, queue_reset)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_ADM_Q_IDX != |
| offsetof(struct virtio_pci_modern_common_cfg, admin_queue_index)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_ADM_Q_NUM != |
| offsetof(struct virtio_pci_modern_common_cfg, admin_queue_num)); |
| } |
| |
| /* |
| * vp_modern_probe: probe the modern virtio pci device, note that the |
| * caller is required to enable PCI device before calling this function. |
| * @mdev: the modern virtio-pci device |
| * |
| * Return 0 on succeed otherwise fail |
| */ |
| int vp_modern_probe(struct virtio_pci_modern_device *mdev) |
| { |
| struct pci_dev *pci_dev = mdev->pci_dev; |
| int err, common, isr, notify, device; |
| u32 notify_length; |
| u32 notify_offset; |
| int devid; |
| |
| check_offsets(); |
| |
| if (mdev->device_id_check) { |
| devid = mdev->device_id_check(pci_dev); |
| if (devid < 0) |
| return devid; |
| mdev->id.device = devid; |
| } else { |
| /* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */ |
| if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f) |
| return -ENODEV; |
| |
| if (pci_dev->device < 0x1040) { |
| /* Transitional devices: use the PCI subsystem device id as |
| * virtio device id, same as legacy driver always did. |
| */ |
| mdev->id.device = pci_dev->subsystem_device; |
| } else { |
| /* Modern devices: simply use PCI device id, but start from 0x1040. */ |
| mdev->id.device = pci_dev->device - 0x1040; |
| } |
| } |
| mdev->id.vendor = pci_dev->subsystem_vendor; |
| |
| /* check for a common config: if not, use legacy mode (bar 0). */ |
| common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG, |
| IORESOURCE_IO | IORESOURCE_MEM, |
| &mdev->modern_bars); |
| if (!common) { |
| dev_info(&pci_dev->dev, |
| "virtio_pci: leaving for legacy driver\n"); |
| return -ENODEV; |
| } |
| |
| /* If common is there, these should be too... */ |
| isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG, |
| IORESOURCE_IO | IORESOURCE_MEM, |
| &mdev->modern_bars); |
| notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG, |
| IORESOURCE_IO | IORESOURCE_MEM, |
| &mdev->modern_bars); |
| if (!isr || !notify) { |
| dev_err(&pci_dev->dev, |
| "virtio_pci: missing capabilities %i/%i/%i\n", |
| common, isr, notify); |
| return -EINVAL; |
| } |
| |
| err = dma_set_mask_and_coherent(&pci_dev->dev, |
| mdev->dma_mask ? : DMA_BIT_MASK(64)); |
| if (err) |
| err = dma_set_mask_and_coherent(&pci_dev->dev, |
| DMA_BIT_MASK(32)); |
| if (err) |
| dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n"); |
| |
| /* Device capability is only mandatory for devices that have |
| * device-specific configuration. |
| */ |
| device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG, |
| IORESOURCE_IO | IORESOURCE_MEM, |
| &mdev->modern_bars); |
| |
| err = pci_request_selected_regions(pci_dev, mdev->modern_bars, |
| "virtio-pci-modern"); |
| if (err) |
| return err; |
| |
| err = -EINVAL; |
| mdev->common = vp_modern_map_capability(mdev, common, |
| sizeof(struct virtio_pci_common_cfg), 4, 0, |
| offsetofend(struct virtio_pci_modern_common_cfg, |
| admin_queue_num), |
| &mdev->common_len, NULL); |
| if (!mdev->common) |
| goto err_map_common; |
| mdev->isr = vp_modern_map_capability(mdev, isr, sizeof(u8), 1, |
| 0, 1, |
| NULL, NULL); |
| if (!mdev->isr) |
| goto err_map_isr; |
| |
| /* Read notify_off_multiplier from config space. */ |
| pci_read_config_dword(pci_dev, |
| notify + offsetof(struct virtio_pci_notify_cap, |
| notify_off_multiplier), |
| &mdev->notify_offset_multiplier); |
| /* Read notify length and offset from config space. */ |
| pci_read_config_dword(pci_dev, |
| notify + offsetof(struct virtio_pci_notify_cap, |
| cap.length), |
| ¬ify_length); |
| |
| pci_read_config_dword(pci_dev, |
| notify + offsetof(struct virtio_pci_notify_cap, |
| cap.offset), |
| ¬ify_offset); |
| |
| /* We don't know how many VQs we'll map, ahead of the time. |
| * If notify length is small, map it all now. |
| * Otherwise, map each VQ individually later. |
| */ |
| if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) { |
| mdev->notify_base = vp_modern_map_capability(mdev, notify, |
| 2, 2, |
| 0, notify_length, |
| &mdev->notify_len, |
| &mdev->notify_pa); |
| if (!mdev->notify_base) |
| goto err_map_notify; |
| } else { |
| mdev->notify_map_cap = notify; |
| } |
| |
| /* Again, we don't know how much we should map, but PAGE_SIZE |
| * is more than enough for all existing devices. |
| */ |
| if (device) { |
| mdev->device = vp_modern_map_capability(mdev, device, 0, 4, |
| 0, PAGE_SIZE, |
| &mdev->device_len, |
| NULL); |
| if (!mdev->device) |
| goto err_map_device; |
| } |
| |
| return 0; |
| |
| err_map_device: |
| if (mdev->notify_base) |
| pci_iounmap(pci_dev, mdev->notify_base); |
| err_map_notify: |
| pci_iounmap(pci_dev, mdev->isr); |
| err_map_isr: |
| pci_iounmap(pci_dev, mdev->common); |
| err_map_common: |
| pci_release_selected_regions(pci_dev, mdev->modern_bars); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_probe); |
| |
| /* |
| * vp_modern_remove: remove and cleanup the modern virtio pci device |
| * @mdev: the modern virtio-pci device |
| */ |
| void vp_modern_remove(struct virtio_pci_modern_device *mdev) |
| { |
| struct pci_dev *pci_dev = mdev->pci_dev; |
| |
| if (mdev->device) |
| pci_iounmap(pci_dev, mdev->device); |
| if (mdev->notify_base) |
| pci_iounmap(pci_dev, mdev->notify_base); |
| pci_iounmap(pci_dev, mdev->isr); |
| pci_iounmap(pci_dev, mdev->common); |
| pci_release_selected_regions(pci_dev, mdev->modern_bars); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_remove); |
| |
| /* |
| * vp_modern_get_features - get features from device |
| * @mdev: the modern virtio-pci device |
| * |
| * Returns the features read from the device |
| */ |
| u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev) |
| { |
| struct virtio_pci_common_cfg __iomem *cfg = mdev->common; |
| |
| u64 features; |
| |
| vp_iowrite32(0, &cfg->device_feature_select); |
| features = vp_ioread32(&cfg->device_feature); |
| vp_iowrite32(1, &cfg->device_feature_select); |
| features |= ((u64)vp_ioread32(&cfg->device_feature) << 32); |
| |
| return features; |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_get_features); |
| |
| /* |
| * vp_modern_get_driver_features - get driver features from device |
| * @mdev: the modern virtio-pci device |
| * |
| * Returns the driver features read from the device |
| */ |
| u64 vp_modern_get_driver_features(struct virtio_pci_modern_device *mdev) |
| { |
| struct virtio_pci_common_cfg __iomem *cfg = mdev->common; |
| |
| u64 features; |
| |
| vp_iowrite32(0, &cfg->guest_feature_select); |
| features = vp_ioread32(&cfg->guest_feature); |
| vp_iowrite32(1, &cfg->guest_feature_select); |
| features |= ((u64)vp_ioread32(&cfg->guest_feature) << 32); |
| |
| return features; |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_get_driver_features); |
| |
| /* |
| * vp_modern_set_features - set features to device |
| * @mdev: the modern virtio-pci device |
| * @features: the features set to device |
| */ |
| void vp_modern_set_features(struct virtio_pci_modern_device *mdev, |
| u64 features) |
| { |
| struct virtio_pci_common_cfg __iomem *cfg = mdev->common; |
| |
| vp_iowrite32(0, &cfg->guest_feature_select); |
| vp_iowrite32((u32)features, &cfg->guest_feature); |
| vp_iowrite32(1, &cfg->guest_feature_select); |
| vp_iowrite32(features >> 32, &cfg->guest_feature); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_set_features); |
| |
| /* |
| * vp_modern_generation - get the device genreation |
| * @mdev: the modern virtio-pci device |
| * |
| * Returns the genreation read from device |
| */ |
| u32 vp_modern_generation(struct virtio_pci_modern_device *mdev) |
| { |
| struct virtio_pci_common_cfg __iomem *cfg = mdev->common; |
| |
| return vp_ioread8(&cfg->config_generation); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_generation); |
| |
| /* |
| * vp_modern_get_status - get the device status |
| * @mdev: the modern virtio-pci device |
| * |
| * Returns the status read from device |
| */ |
| u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev) |
| { |
| struct virtio_pci_common_cfg __iomem *cfg = mdev->common; |
| |
| return vp_ioread8(&cfg->device_status); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_get_status); |
| |
| /* |
| * vp_modern_set_status - set status to device |
| * @mdev: the modern virtio-pci device |
| * @status: the status set to device |
| */ |
| void vp_modern_set_status(struct virtio_pci_modern_device *mdev, |
| u8 status) |
| { |
| struct virtio_pci_common_cfg __iomem *cfg = mdev->common; |
| |
| /* |
| * Per memory-barriers.txt, wmb() is not needed to guarantee |
| * that the cache coherent memory writes have completed |
| * before writing to the MMIO region. |
| */ |
| vp_iowrite8(status, &cfg->device_status); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_set_status); |
| |
| /* |
| * vp_modern_get_queue_reset - get the queue reset status |
| * @mdev: the modern virtio-pci device |
| * @index: queue index |
| */ |
| int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index) |
| { |
| struct virtio_pci_modern_common_cfg __iomem *cfg; |
| |
| cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common; |
| |
| vp_iowrite16(index, &cfg->cfg.queue_select); |
| return vp_ioread16(&cfg->queue_reset); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_get_queue_reset); |
| |
| /* |
| * vp_modern_set_queue_reset - reset the queue |
| * @mdev: the modern virtio-pci device |
| * @index: queue index |
| */ |
| void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index) |
| { |
| struct virtio_pci_modern_common_cfg __iomem *cfg; |
| |
| cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common; |
| |
| vp_iowrite16(index, &cfg->cfg.queue_select); |
| vp_iowrite16(1, &cfg->queue_reset); |
| |
| while (vp_ioread16(&cfg->queue_reset)) |
| msleep(1); |
| |
| while (vp_ioread16(&cfg->cfg.queue_enable)) |
| msleep(1); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_set_queue_reset); |
| |
| /* |
| * vp_modern_queue_vector - set the MSIX vector for a specific virtqueue |
| * @mdev: the modern virtio-pci device |
| * @index: queue index |
| * @vector: the config vector |
| * |
| * Returns the config vector read from the device |
| */ |
| u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev, |
| u16 index, u16 vector) |
| { |
| struct virtio_pci_common_cfg __iomem *cfg = mdev->common; |
| |
| vp_iowrite16(index, &cfg->queue_select); |
| vp_iowrite16(vector, &cfg->queue_msix_vector); |
| /* Flush the write out to device */ |
| return vp_ioread16(&cfg->queue_msix_vector); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_queue_vector); |
| |
| /* |
| * vp_modern_config_vector - set the vector for config interrupt |
| * @mdev: the modern virtio-pci device |
| * @vector: the config vector |
| * |
| * Returns the config vector read from the device |
| */ |
| u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev, |
| u16 vector) |
| { |
| struct virtio_pci_common_cfg __iomem *cfg = mdev->common; |
| |
| /* Setup the vector used for configuration events */ |
| vp_iowrite16(vector, &cfg->msix_config); |
| /* Verify we had enough resources to assign the vector */ |
| /* Will also flush the write out to device */ |
| return vp_ioread16(&cfg->msix_config); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_config_vector); |
| |
| /* |
| * vp_modern_queue_address - set the virtqueue address |
| * @mdev: the modern virtio-pci device |
| * @index: the queue index |
| * @desc_addr: address of the descriptor area |
| * @driver_addr: address of the driver area |
| * @device_addr: address of the device area |
| */ |
| void vp_modern_queue_address(struct virtio_pci_modern_device *mdev, |
| u16 index, u64 desc_addr, u64 driver_addr, |
| u64 device_addr) |
| { |
| struct virtio_pci_common_cfg __iomem *cfg = mdev->common; |
| |
| vp_iowrite16(index, &cfg->queue_select); |
| |
| vp_iowrite64_twopart(desc_addr, &cfg->queue_desc_lo, |
| &cfg->queue_desc_hi); |
| vp_iowrite64_twopart(driver_addr, &cfg->queue_avail_lo, |
| &cfg->queue_avail_hi); |
| vp_iowrite64_twopart(device_addr, &cfg->queue_used_lo, |
| &cfg->queue_used_hi); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_queue_address); |
| |
| /* |
| * vp_modern_set_queue_enable - enable a virtqueue |
| * @mdev: the modern virtio-pci device |
| * @index: the queue index |
| * @enable: whether the virtqueue is enable or not |
| */ |
| void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev, |
| u16 index, bool enable) |
| { |
| vp_iowrite16(index, &mdev->common->queue_select); |
| vp_iowrite16(enable, &mdev->common->queue_enable); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_set_queue_enable); |
| |
| /* |
| * vp_modern_get_queue_enable - enable a virtqueue |
| * @mdev: the modern virtio-pci device |
| * @index: the queue index |
| * |
| * Returns whether a virtqueue is enabled or not |
| */ |
| bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev, |
| u16 index) |
| { |
| vp_iowrite16(index, &mdev->common->queue_select); |
| |
| return vp_ioread16(&mdev->common->queue_enable); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_get_queue_enable); |
| |
| /* |
| * vp_modern_set_queue_size - set size for a virtqueue |
| * @mdev: the modern virtio-pci device |
| * @index: the queue index |
| * @size: the size of the virtqueue |
| */ |
| void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev, |
| u16 index, u16 size) |
| { |
| vp_iowrite16(index, &mdev->common->queue_select); |
| vp_iowrite16(size, &mdev->common->queue_size); |
| |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_set_queue_size); |
| |
| /* |
| * vp_modern_get_queue_size - get size for a virtqueue |
| * @mdev: the modern virtio-pci device |
| * @index: the queue index |
| * |
| * Returns the size of the virtqueue |
| */ |
| u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev, |
| u16 index) |
| { |
| vp_iowrite16(index, &mdev->common->queue_select); |
| |
| return vp_ioread16(&mdev->common->queue_size); |
| |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_get_queue_size); |
| |
| /* |
| * vp_modern_get_num_queues - get the number of virtqueues |
| * @mdev: the modern virtio-pci device |
| * |
| * Returns the number of virtqueues |
| */ |
| u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev) |
| { |
| return vp_ioread16(&mdev->common->num_queues); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_get_num_queues); |
| |
| /* |
| * vp_modern_get_queue_notify_off - get notification offset for a virtqueue |
| * @mdev: the modern virtio-pci device |
| * @index: the queue index |
| * |
| * Returns the notification offset for a virtqueue |
| */ |
| static u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev, |
| u16 index) |
| { |
| vp_iowrite16(index, &mdev->common->queue_select); |
| |
| return vp_ioread16(&mdev->common->queue_notify_off); |
| } |
| |
| /* |
| * vp_modern_map_vq_notify - map notification area for a |
| * specific virtqueue |
| * @mdev: the modern virtio-pci device |
| * @index: the queue index |
| * @pa: the pointer to the physical address of the nofity area |
| * |
| * Returns the address of the notification area |
| */ |
| void __iomem *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev, |
| u16 index, resource_size_t *pa) |
| { |
| u16 off = vp_modern_get_queue_notify_off(mdev, index); |
| |
| if (mdev->notify_base) { |
| /* offset should not wrap */ |
| if ((u64)off * mdev->notify_offset_multiplier + 2 |
| > mdev->notify_len) { |
| dev_warn(&mdev->pci_dev->dev, |
| "bad notification offset %u (x %u) " |
| "for queue %u > %zd", |
| off, mdev->notify_offset_multiplier, |
| index, mdev->notify_len); |
| return NULL; |
| } |
| if (pa) |
| *pa = mdev->notify_pa + |
| off * mdev->notify_offset_multiplier; |
| return mdev->notify_base + off * mdev->notify_offset_multiplier; |
| } else { |
| return vp_modern_map_capability(mdev, |
| mdev->notify_map_cap, 2, 2, |
| off * mdev->notify_offset_multiplier, 2, |
| NULL, pa); |
| } |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_map_vq_notify); |
| |
| u16 vp_modern_avq_num(struct virtio_pci_modern_device *mdev) |
| { |
| struct virtio_pci_modern_common_cfg __iomem *cfg; |
| |
| cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common; |
| return vp_ioread16(&cfg->admin_queue_num); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_avq_num); |
| |
| u16 vp_modern_avq_index(struct virtio_pci_modern_device *mdev) |
| { |
| struct virtio_pci_modern_common_cfg __iomem *cfg; |
| |
| cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common; |
| return vp_ioread16(&cfg->admin_queue_index); |
| } |
| EXPORT_SYMBOL_GPL(vp_modern_avq_index); |
| |
| MODULE_VERSION("0.1"); |
| MODULE_DESCRIPTION("Modern Virtio PCI Device"); |
| MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>"); |
| MODULE_LICENSE("GPL"); |
