From: Zhu Lingshan Date: Wed, 2 Jun 2021 08:45:50 +0000 (+0800) Subject: vDPA/ifcvf: implement doorbell mapping for ifcvf X-Git-Tag: v5.15~754^2~43 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5f1b73a275f8c0ec03b46b01990e93d6dac30848;p=platform%2Fkernel%2Flinux-starfive.git 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 Link: https://lore.kernel.org/r/20210602084550.289599-3-lingshan.zhu@intel.com Acked-by: Jason Wang Signed-off-by: Michael S. Tsirkin --- diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c index ab0ab5c..46a992e 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)