[RFC PATCH v9 1/5] iommu/vt-d: add flush_target_dev member to struct intel_iommu and pass device info to all ATS Invalidation functions

Ethan Zhao
2023-12-28T00:16:54Z

As iommu is a pointer member of device_domain_info, so can't play
trick like container_of() to get the info and device instance for
qi_submit_sync() low level function to check device status, add a
flush_target_dev member to struct inte_iommu and pass dev info to
all device-TLB invalidation (a.k.a ATS Invalidation) functions.

Signed-off-by: Ethan Zhao <haifeng.zhao@linux.intel.com>
---
drivers/iommu/intel/iommu.c | 1 +
drivers/iommu/intel/iommu.h | 2 ++
drivers/iommu/intel/pasid.c | 1 +
drivers/iommu/intel/svm.c | 1 +
4 files changed, 5 insertions(+)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 897159dba47d..c3724f1d86dc 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -1461,6 +1461,7 @@ static void __iommu_flush_dev_iotlb(struct device_domain_info *info,

sid = info->bus << 8 | info->devfn;
qdep = info->ats_qdep;
+ info->iommu->flush_target_dev = info->dev;
qi_flush_dev_iotlb(info->iommu, sid, info->pfsid,
qdep, addr, mask);
quirk_extra_dev_tlb_flush(info, addr, mask, IOMMU_NO_PASID, qdep);
diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
index ce030c5b5772..e892c5c7560a 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -731,6 +731,8 @@ struct intel_iommu {
void *perf_statistic;

struct iommu_pmu *pmu;
+
+ struct device *flush_target_dev; /* the target device TLB to be invalidated. */
};

/* PCI domain-device relationship */
diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c
index 74e8e4c17e81..1c87fb1b1039 100644
--- a/drivers/iommu/intel/pasid.c
+++ b/drivers/iommu/intel/pasid.c
@@ -485,6 +485,7 @@ devtlb_invalidation_with_pasid(struct intel_iommu *iommu,
qdep = info->ats_qdep;
pfsid = info->pfsid;

+ info->iommu->flush_target_dev = info->dev;
/*
* When PASID 0 is used, it indicates RID2PASID(DMA request w/o PASID),
* devTLB flush w/o PASID should be used. For non-zero PASID under
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index ac12f76c1212..d42a99801cdf 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -181,6 +181,7 @@ static void __flush_svm_range_dev(struct intel_svm *svm,

qi_flush_piotlb(sdev->iommu, sdev->did, svm->pasid, address, pages, ih);
if (info->ats_enabled) {
+ info->iommu->flush_target_dev = info->dev;
qi_flush_dev_iotlb_pasid(sdev->iommu, sdev->sid, info->pfsid,
svm->pasid, sdev->qdep, address,
order_base_2(pages));
--
2.31.1