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...@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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