diff options
Diffstat (limited to 'drivers/virtio/virtio_pci_modern_dev.c')
| -rw-r--r-- | drivers/virtio/virtio_pci_modern_dev.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_pci_modern_dev.c b/drivers/virtio/virtio_pci_modern_dev.c index fa2a9445bb18..869cb46bef96 100644 --- a/drivers/virtio/virtio_pci_modern_dev.c +++ b/drivers/virtio/virtio_pci_modern_dev.c @@ -3,6 +3,7 @@ #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 @@ -475,6 +476,44 @@ void vp_modern_set_status(struct virtio_pci_modern_device *mdev, 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 |