On 2022/3/15 13:07, Jacob Pan wrote:
From: Lu Baolu <baolu...@linux.intel.com>
An IOMMU domain represents an address space which can be attached by
devices that perform DMA within a domain. However, for platforms with
PASID capability the domain attachment needs be handled at device+PASID
level. There can be multiple PASIDs within a device and multiple devices
attached to a given domain.
This patch introduces a new IOMMU op which support device, PASID, and
IOMMU domain attachment. The immediate use case is for PASID capable
devices to perform DMA under DMA APIs.
Signed-off-by: Lu Baolu <baolu...@linux.intel.com>
Signed-off-by: Jacob Pan <jacob.jun....@linux.intel.com>
---
include/linux/iommu.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 369f05c2a4e2..fde5b933dbe3 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -227,6 +227,8 @@ struct iommu_iotlb_gather {
* @aux_get_pasid: get the pasid given an aux-domain
* @sva_bind: Bind process address space to device
* @sva_unbind: Unbind process address space from device
+ * @attach_dev_pasid: attach an iommu domain to a pasid of device
+ * @detach_dev_pasid: detach an iommu domain from a pasid of device
* @sva_get_pasid: Get PASID associated to a SVA handle
* @page_response: handle page request response
* @cache_invalidate: invalidate translation caches
@@ -296,6 +298,10 @@ struct iommu_ops {
struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct *mm,
void *drvdata);
void (*sva_unbind)(struct iommu_sva *handle);
+ int (*attach_dev_pasid)(struct iommu_domain *domain,
+ struct device *dev, ioasid_t id);
+ void (*detach_dev_pasid)(struct iommu_domain *domain,
+ struct device *dev, ioasid_t id);
As we have introduced iommu_domain_ops, these callbacks should be part
of the domain ops.
u32 (*sva_get_pasid)(struct iommu_sva *handle);
int (*page_response)(struct device *dev,
Best regards,
baolu
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