linux-kernel - [RFC PATCH v8 1/5] iommu/vt-d: add flush_target_dev member to struct intel_iommu and pass device info to all ATS invalidation functions

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Message-Id: <20231227030918.536413-2-haifeng.zhao@linux.intel.com>
Date: Tue, 26 Dec 2023 22:09:14 -0500
From: Ethan Zhao <haifeng.zhao@...ux.intel.com>
To: bhelgaas@...gle.com,
	baolu.lu@...ux.intel.com,
	dwmw2@...radead.org,
	will@...nel.org,
	robin.murphy@....com,
	lukas@...ner.de
Cc: linux-pci@...r.kernel.org,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH v8 1/5] iommu/vt-d: add flush_target_dev member to struct intel_iommu and pass device info to all ATS invalidation functions

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@...ux.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