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Re: [PATCH 06/11] iommu: Add iommu_device_set_fwnode() interface

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On 10/02/17 15:22, Joerg Roedel wrote:
> Hi Robin,
> 
> On Fri, Feb 10, 2017 at 02:16:54PM +0000, Robin Murphy wrote:
>>> +static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
>>> +					   struct fwnode_handle *fwnode)
>>> +{
>>> +	iommu->fwnode = fwnode;
>>> +}
>>
>> Would it make sense to simply make the ops and fwnode additional
>> arguments to iommu_device_register() (permitting fwnode to be NULL)?
>> AFAICS they should typically all have the same effective lifetime so
>> there doesn't seem to be any real need to handle everything separately.
> 
> Well, it is not yet clear what other information will end up in
> 'struct iommu_device', and I don't want to add another parameter to
> iommu_device_register for every new struct member.

That's a fair point. I think the ops, as a core piece of the whole API,
would be sufficiently self-explanatory as part of registration, but then
we'd end up with a weird interface with different members initialised
through different paths, and I agree that ends up just as ugly.

> Also I think having these wrappers is more readable in the code, as it
> is clear what the code does without looking up the function prototypes
> in the header.

Yeah, on reflection explicit initialisation is certainly easier to read
than a bunch of arguments handled implicitly by register(), but then
from that angle, even more clear would be to simply have the drivers
write the relevant struct members directly - I'd be quite happy with
that, and we then don't have to add another setter to iommu.h for every
new struct member (and risk it looking like Java code...)

Robin.

> 
> It might make sense to set the mandatory struct members via
> iommu_device_register in the future, but we'll see :)
> 
> 
> 	Joerg
> 

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[PATCH 00/11 v3] Let IOMMU core know about individual IOMMUs Joerg Roedel <joro@8bytes.org> - 2017-02-09 12:50 +0100
  [PATCH 02/11] iommu: Rename struct iommu_device Joerg Roedel <joro@8bytes.org> - 2017-02-09 12:50 +0100
  [PATCH 08/11] iommu/msm: Make use of iommu_device_register interface Joerg Roedel <joro@8bytes.org> - 2017-02-09 12:50 +0100
    Re: [PATCH 08/11] iommu/msm: Make use of iommu_device_register  interface Robin Murphy <robin.murphy@arm.com> - 2017-02-10 15:40 +0100
      Re: [PATCH 08/11] iommu/msm: Make use of iommu_device_register  interface Joerg Roedel <joro@8bytes.org> - 2017-02-10 17:00 +0100
        Re: [PATCH 08/11] iommu/msm: Make use of iommu_device_register  interface Robin Murphy <robin.murphy@arm.com> - 2017-02-10 18:40 +0100
  [PATCH 05/11] iommu: Make iommu_device_link/unlink take a struct iommu_device Joerg Roedel <joro@8bytes.org> - 2017-02-09 13:40 +0100
  [PATCH 07/11] iommu/arm-smmu: Make use of the iommu_register interface Joerg Roedel <joro@8bytes.org> - 2017-02-09 13:40 +0100
    Re: [PATCH 07/11] iommu/arm-smmu: Make use of the iommu_register  interface Robin Murphy <robin.murphy@arm.com> - 2017-02-10 15:30 +0100
      Re: [PATCH 07/11] iommu/arm-smmu: Make use of the iommu_register  interface Joerg Roedel <joro@8bytes.org> - 2017-02-10 16:40 +0100
        Re: [PATCH 07/11] iommu/arm-smmu: Make use of the iommu_register  interface Robin Murphy <robin.murphy@arm.com> - 2017-02-10 18:10 +0100
  [PATCH 04/11] iommu: Add sysfs bindings for struct iommu_device Joerg Roedel <joro@8bytes.org> - 2017-02-09 14:50 +0100
  [PATCH 03/11] iommu: Introduce new 'struct iommu_device' Joerg Roedel <joro@8bytes.org> - 2017-02-09 14:50 +0100
    Re: [PATCH 03/11] iommu: Introduce new 'struct iommu_device' kbuild test robot <lkp@intel.com> - 2017-02-09 21:50 +0100
  [PATCH 09/11] iommu/mediatek: Make use of iommu_device_register interface Joerg Roedel <joro@8bytes.org> - 2017-02-09 14:50 +0100
  [PATCH 06/11] iommu: Add iommu_device_set_fwnode() interface Joerg Roedel <joro@8bytes.org> - 2017-02-09 14:50 +0100
    Re: [PATCH 06/11] iommu: Add iommu_device_set_fwnode() interface Robin Murphy <robin.murphy@arm.com> - 2017-02-10 15:20 +0100
      Re: [PATCH 06/11] iommu: Add iommu_device_set_fwnode() interface Joerg Roedel <joro@8bytes.org> - 2017-02-10 16:30 +0100
        Re: [PATCH 06/11] iommu: Add iommu_device_set_fwnode() interface Robin Murphy <robin.murphy@arm.com> - 2017-02-10 17:10 +0100
          Re: [PATCH 06/11] iommu: Add iommu_device_set_fwnode() interface Joerg Roedel <jroedel@suse.de> - 2017-02-10 17:20 +0100
            Re: [PATCH 06/11] iommu: Add iommu_device_set_fwnode() interface Robin Murphy <robin.murphy@arm.com> - 2017-02-10 18:10 +0100
  [PATCH 01/11] iommu: Rename iommu_get_instance() Joerg Roedel <joro@8bytes.org> - 2017-02-09 14:50 +0100
    Re: [PATCH 01/11] iommu: Rename iommu_get_instance() Robin Murphy <robin.murphy@arm.com> - 2017-02-10 15:20 +0100
      Re: [PATCH 01/11] iommu: Rename iommu_get_instance() Joerg Roedel <joro@8bytes.org> - 2017-02-10 16:40 +0100

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