Commit 5f1b73a2 authored by Zhu Lingshan's avatar Zhu Lingshan Committed by Michael S. Tsirkin
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vDPA/ifcvf: implement doorbell mapping for ifcvf 



This commit implements doorbell mapping feature for ifcvf.
This feature maps the notify page to userspace, to eliminate
vmexit when kick a vq.

Signed-off-by: default avatarZhu Lingshan <lingshan.zhu@intel.com>
Link: https://lore.kernel.org/r/20210602084550.289599-3-lingshan.zhu@intel.com


Acked-by: default avatarJason Wang <jasowang@redhat.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 04c6ad8f

drivers/vdpa/ifcvf/ifcvf_main.c

+16 −0
Original line number Diff line number Diff line
@@ -413,6 +413,21 @@ static int ifcvf_vdpa_get_vq_irq(struct vdpa_device *vdpa_dev, 
	return vf->vring[qid].irq;

}



static struct vdpa_notification_area ifcvf_get_vq_notification(struct vdpa_device *vdpa_dev,

							       u16 idx)

{

	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	struct vdpa_notification_area area;



	area.addr = vf->vring[idx].notify_pa;

	if (!vf->notify_off_multiplier)

		area.size = PAGE_SIZE;

	else

		area.size = vf->notify_off_multiplier;



	return area;

}



/*

 * IFCVF currently does't have on-chip IOMMU, so not

 * implemented set_map()/dma_map()/dma_unmap()
@@ -440,6 +455,7 @@ static const struct vdpa_config_ops ifc_vdpa_ops = { 
	.get_config	= ifcvf_vdpa_get_config,

	.set_config	= ifcvf_vdpa_set_config,

	.set_config_cb  = ifcvf_vdpa_set_config_cb,

	.get_vq_notification = ifcvf_get_vq_notification,

};



static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)