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SubjectRe: [PATCH RFC v2 06/11] iommu/vt-d: Add SVA domain support
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On 2022/3/31 3:09, Jason Gunthorpe wrote:
> On Tue, Mar 29, 2022 at 01:37:55PM +0800, Lu Baolu wrote:
>> Add support for SVA domain allocation and provide an SVA-specific
>> iommu_domain_ops.
>>
>> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
>> include/linux/intel-iommu.h | 1 +
>> drivers/iommu/intel/iommu.c | 10 ++++++++++
>> drivers/iommu/intel/svm.c | 37 +++++++++++++++++++++++++++++++++++++
>> 3 files changed, 48 insertions(+)
>>
>> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
>> index 2f9891cb3d00..c14283137fb5 100644
>> +++ b/include/linux/intel-iommu.h
>> @@ -744,6 +744,7 @@ void intel_svm_unbind(struct iommu_sva *handle);
>> u32 intel_svm_get_pasid(struct iommu_sva *handle);
>> int intel_svm_page_response(struct device *dev, struct iommu_fault_event *evt,
>> struct iommu_page_response *msg);
>> +extern const struct iommu_domain_ops intel_svm_domain_ops;
>>
>> struct intel_svm_dev {
>> struct list_head list;
>> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
>> index c1b91bce1530..5eae7cf9bee5 100644
>> +++ b/drivers/iommu/intel/iommu.c
>> @@ -4318,6 +4318,16 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
>> return domain;
>> case IOMMU_DOMAIN_IDENTITY:
>> return &si_domain->domain;
>> +#ifdef CONFIG_INTEL_IOMMU_SVM
>> + case IOMMU_DOMAIN_SVA:
>> + dmar_domain = alloc_domain(type);
>> + if (!dmar_domain)
>> + return NULL;
>> + domain = &dmar_domain->domain;
>> + domain->ops = &intel_svm_domain_ops;
>> +
>> + return domain;
>> +#endif /* CONFIG_INTEL_IOMMU_SVM */
>
> If this is the usual pattern for drivers I would prefer to see an
> alloc_sva op instead of more and more types.
>
> Multiplexing functions is often not a great idea...

Robin mentioned that the iommu domain alloc/free interfaces are under
reforming. These cleanups need to wait to see what the final code looks
like.

Best regards,
baolu

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