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authorZhu Lingshan <lingshan.zhu@intel.com>2021-06-02 11:45:50 +0300
committerMichael S. Tsirkin <mst@redhat.com>2021-07-03 11:50:51 +0300
commit5f1b73a275f8c0ec03b46b01990e93d6dac30848 (patch)
treed0809e1699c00720053fbb34d2be3e4c45c98a37 /drivers/vdpa/ifcvf
parent04c6ad8f22da9394687d30a0d5b5477c075e2833 (diff)
downloadlinux-5f1b73a275f8c0ec03b46b01990e93d6dac30848.tar.xz
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: Zhu Lingshan <lingshan.zhu@intel.com> Link: https://lore.kernel.org/r/20210602084550.289599-3-lingshan.zhu@intel.com Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vdpa/ifcvf')
-rw-r--r--drivers/vdpa/ifcvf/ifcvf_main.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index ab0ab5cf0f6e..46a992eab3e5 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -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)