Re: [PATCH 1/1] PCI: Add translated request only opt-in for pci_enable_pasid()

[Jason Gunthorpe <jgg@nvidia.com>]

On Thu, Jan 12, 2023 at 09:25:25PM +0800, Baolu Lu wrote:
> On 2023/1/12 20:38, Jason Gunthorpe wrote:
> > On Thu, Jan 12, 2023 at 04:46:29PM +0800, Lu Baolu wrote:
> > 
> > > -int pci_enable_pasid(struct pci_dev *pdev, int features);
> > > +int pci_enable_pasid(struct pci_dev *pdev, int features, bool
> > > transled_only);
> > 
> > Please use a named flag so we can grep for it..
> 
> Sure. What do you think of this naming?
> 
> + * @flags: device-specific flags
> + *   - PCI_PASID_TRANSLED_REQ_ONLY: The PCI device only issues PASID
> + *                                  memory requests of translated type.

Yes

> > Discuss in the commit message that this is a temporary step and that
> > pci_enable_pasid() needs to be moved to the drivers
> 
> I will add below in commit message:
> 
> At present, it is a common practice to enable/disable PCI PASID in the
> iommu drivers. Considering that the device driver knows more about the
> specific device, we will follow up by moving pci_enable_pasid() into
> the specific device drivers.

Yes

Jason