| Message ID | 20210601062850.4547-3-lingshan.zhu@intel.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | vDPA/ifcvf: implement doorbell mapping feature | expand |
在 2021/6/1 下午4:56, Zhu, Lingshan 写道: > > > On 6/1/2021 4:50 PM, Jason Wang wrote: >> >> 在 2021/6/1 下午2:28, Zhu Lingshan 写道: >>> 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> >>> --- >>> drivers/vdpa/ifcvf/ifcvf_main.c | 21 +++++++++++++++++++++ >>> 1 file changed, 21 insertions(+) >>> >>> diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c >>> b/drivers/vdpa/ifcvf/ifcvf_main.c >>> index ab0ab5cf0f6e..d41db042612c 100644 >>> --- a/drivers/vdpa/ifcvf/ifcvf_main.c >>> +++ b/drivers/vdpa/ifcvf/ifcvf_main.c >>> @@ -413,6 +413,26 @@ 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_adapter *adapter = vdpa_to_adapter(vdpa_dev); >>> + struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev); >>> + struct pci_dev *pdev = adapter->pdev; >>> + 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; >>> + >>> + if (area.addr % PAGE_SIZE) >>> + IFCVF_DBG(pdev, "vq %u doorbell address is not PAGE_SIZE >>> aligned\n", idx); >> >> >> I don't see the reason to keep this, or get_notification is not the >> proper place to do this kind of warning. >> >> Thanks > some customers have ever complained have troubles to enable such > features with their IP, > I think this can help them debug. If you want to do this, the ifcvf_init_hw() is the proper place. Note that this function is called by userspace. Thanks > > Thanks >> >> >>> + >>> + return area; >>> +} >>> + >>> /* >>> * IFCVF currently does't have on-chip IOMMU, so not >>> * implemented set_map()/dma_map()/dma_unmap() >>> @@ -440,6 +460,7 @@ 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) >> >
On 6/1/2021 4:57 PM, Jason Wang wrote: > > 在 2021/6/1 下午4:56, Zhu, Lingshan 写道: >> >> >> On 6/1/2021 4:50 PM, Jason Wang wrote: >>> >>> 在 2021/6/1 下午2:28, Zhu Lingshan 写道: >>>> 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> >>>> --- >>>> drivers/vdpa/ifcvf/ifcvf_main.c | 21 +++++++++++++++++++++ >>>> 1 file changed, 21 insertions(+) >>>> >>>> diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c >>>> b/drivers/vdpa/ifcvf/ifcvf_main.c >>>> index ab0ab5cf0f6e..d41db042612c 100644 >>>> --- a/drivers/vdpa/ifcvf/ifcvf_main.c >>>> +++ b/drivers/vdpa/ifcvf/ifcvf_main.c >>>> @@ -413,6 +413,26 @@ 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_adapter *adapter = vdpa_to_adapter(vdpa_dev); >>>> + struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev); >>>> + struct pci_dev *pdev = adapter->pdev; >>>> + 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; >>>> + >>>> + if (area.addr % PAGE_SIZE) >>>> + IFCVF_DBG(pdev, "vq %u doorbell address is not PAGE_SIZE >>>> aligned\n", idx); >>> >>> >>> I don't see the reason to keep this, or get_notification is not the >>> proper place to do this kind of warning. >>> >>> Thanks >> some customers have ever complained have troubles to enable such >> features with their IP, >> I think this can help them debug. > > > If you want to do this, the ifcvf_init_hw() is the proper place. > > Note that this function is called by userspace. > > Thanks OK, will move to there. Thanks! > > >> >> Thanks >>> >>> >>>> + >>>> + return area; >>>> +} >>>> + >>>> /* >>>> * IFCVF currently does't have on-chip IOMMU, so not >>>> * implemented set_map()/dma_map()/dma_unmap() >>>> @@ -440,6 +460,7 @@ 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) >>> >> >
On 6/1/2021 4:58 PM, Zhu, Lingshan wrote: > > > On 6/1/2021 4:57 PM, Jason Wang wrote: >> >> 在 2021/6/1 下午4:56, Zhu, Lingshan 写道: >>> >>> >>> On 6/1/2021 4:50 PM, Jason Wang wrote: >>>> >>>> 在 2021/6/1 下午2:28, Zhu Lingshan 写道: >>>>> 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> >>>>> --- >>>>> drivers/vdpa/ifcvf/ifcvf_main.c | 21 +++++++++++++++++++++ >>>>> 1 file changed, 21 insertions(+) >>>>> >>>>> diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c >>>>> b/drivers/vdpa/ifcvf/ifcvf_main.c >>>>> index ab0ab5cf0f6e..d41db042612c 100644 >>>>> --- a/drivers/vdpa/ifcvf/ifcvf_main.c >>>>> +++ b/drivers/vdpa/ifcvf/ifcvf_main.c >>>>> @@ -413,6 +413,26 @@ 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_adapter *adapter = vdpa_to_adapter(vdpa_dev); >>>>> + struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev); >>>>> + struct pci_dev *pdev = adapter->pdev; >>>>> + 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; >>>>> + >>>>> + if (area.addr % PAGE_SIZE) >>>>> + IFCVF_DBG(pdev, "vq %u doorbell address is not PAGE_SIZE >>>>> aligned\n", idx); >>>> >>>> >>>> I don't see the reason to keep this, or get_notification is not the >>>> proper place to do this kind of warning. >>>> >>>> Thanks >>> some customers have ever complained have troubles to enable such >>> features with their IP, >>> I think this can help them debug. >> >> >> If you want to do this, the ifcvf_init_hw() is the proper place. >> >> Note that this function is called by userspace. >> >> Thanks > OK, will move to there. > > Thanks! oh, I see patch 1 is already has been acked, so I will remove this warning. Thanks! >> >> >>> >>> Thanks >>>> >>>> >>>>> + >>>>> + return area; >>>>> +} >>>>> + >>>>> /* >>>>> * IFCVF currently does't have on-chip IOMMU, so not >>>>> * implemented set_map()/dma_map()/dma_unmap() >>>>> @@ -440,6 +460,7 @@ 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) >>>> >>> >> >
diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c index ab0ab5cf0f6e..d41db042612c 100644 --- a/drivers/vdpa/ifcvf/ifcvf_main.c +++ b/drivers/vdpa/ifcvf/ifcvf_main.c @@ -413,6 +413,26 @@ 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_adapter *adapter = vdpa_to_adapter(vdpa_dev); + struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev); + struct pci_dev *pdev = adapter->pdev; + 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; + + if (area.addr % PAGE_SIZE) + IFCVF_DBG(pdev, "vq %u doorbell address is not PAGE_SIZE aligned\n", idx); + + return area; +} + /* * IFCVF currently does't have on-chip IOMMU, so not * implemented set_map()/dma_map()/dma_unmap() @@ -440,6 +460,7 @@ 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)
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> --- drivers/vdpa/ifcvf/ifcvf_main.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)