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virtio_pci_modern: introduce helper to map vq notify area

Browse source 
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