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virtio_pci_modern: introduce helper to map vq notify area

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This patch factors out the logic of vq notify area mapping. Following
patches will switch to use this common helpers for both virtio_pci
library and virtio-pci vDPA driver.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210415073147.19331-2-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
This commit is contained in:
Jason Wang 2021-04-15 03:31:41 -04:00 committed by Michael S. Tsirkin
parent 122b84a126
commit 9e3bb9b79a
2 changed files with 37 additions and 0 deletions
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35
drivers/virtio/virtio_pci_modern_dev.c
View File

@ -593,6 +593,41 @@ u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev,
}
EXPORT_SYMBOL_GPL(vp_modern_get_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
*
* Returns the address of the notification area
*/
void *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
u16 index)
{
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;
}
return (void __force *)mdev->notify_base +
off * mdev->notify_offset_multiplier;
} else {
return (void __force *)vp_modern_map_capability(mdev,
mdev->notify_map_cap, 2, 2,
off * mdev->notify_offset_multiplier, 2,
NULL);
}
}
EXPORT_SYMBOL_GPL(vp_modern_map_vq_notify);
MODULE_VERSION("0.1");
MODULE_DESCRIPTION("Modern Virtio PCI Device");
MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>");

2
include/linux/virtio_pci_modern.h
View File

@ -106,6 +106,8 @@ void __iomem *vp_modern_map_capability(struct virtio_pci_modern_device *mdev, in
u32 align,
u32 start, u32 size,
size_t *len);
void *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
u16 index);
int vp_modern_probe(struct virtio_pci_modern_device *mdev);
void vp_modern_remove(struct virtio_pci_modern_device *mdev);
#endif