linux-kernel - [PATCH v3 4/7] iommu/vt-d: Fold dmar_remove_one_dev

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Message-Id: <20221114014049.3959-5-baolu.lu@linux.intel.com>
Date:   Mon, 14 Nov 2022 09:40:46 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     iommu@...ts.linux.dev
Cc:     Joerg Roedel <joro@...tes.org>, Kevin Tian <kevin.tian@...el.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        linux-kernel@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH v3 4/7] iommu/vt-d: Fold dmar_remove_one_dev_info() into its caller

Fold dmar_remove_one_dev_info() into intel_iommu_release_device() which
is its only caller. Replace most of the code with
device_block_translation() to make the code neat and tidy.

Rename iommu_disable_dev_iotlb() to iommu_disable_pci_caps() to pair with
iommu_enable_pci_caps().

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel/iommu.c | 33 ++++++---------------------------
 1 file changed, 6 insertions(+), 27 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 3d3fa182fcb1..f165e0d37bab 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -1443,7 +1443,7 @@ static void iommu_enable_pci_caps(struct device_domain_info *info)
 	}
 }
 
-static void iommu_disable_dev_iotlb(struct device_domain_info *info)
+static void iommu_disable_pci_caps(struct device_domain_info *info)
 {
 	struct pci_dev *pdev;
 
@@ -4089,30 +4089,6 @@ static void domain_context_clear(struct device_domain_info *info)
 			       &domain_context_clear_one_cb, info);
 }
 
-static void dmar_remove_one_dev_info(struct device *dev)
-{
-	struct device_domain_info *info = dev_iommu_priv_get(dev);
-	struct dmar_domain *domain = info->domain;
-	struct intel_iommu *iommu = info->iommu;
-	unsigned long flags;
-
-	if (!dev_is_real_dma_subdevice(info->dev)) {
-		if (dev_is_pci(info->dev) && sm_supported(iommu))
-			intel_pasid_tear_down_entry(iommu, info->dev,
-					PASID_RID2PASID, false);
-
-		iommu_disable_dev_iotlb(info);
-		domain_context_clear(info);
-	}
-
-	spin_lock_irqsave(&domain->lock, flags);
-	list_del(&info->link);
-	spin_unlock_irqrestore(&domain->lock, flags);
-
-	domain_detach_iommu(domain, iommu);
-	info->domain = NULL;
-}
-
 /*
  * Clear the page table pointer in context or pasid table entries so that
  * all DMA requests without PASID from the device are blocked. If the page
@@ -4124,7 +4100,7 @@ static void device_block_translation(struct device *dev)
 	struct intel_iommu *iommu = info->iommu;
 	unsigned long flags;
 
-	iommu_disable_dev_iotlb(info);
+	iommu_disable_pci_caps(info);
 	if (!dev_is_real_dma_subdevice(dev)) {
 		if (sm_supported(iommu))
 			intel_pasid_tear_down_entry(iommu, dev,
@@ -4562,7 +4538,10 @@ static void intel_iommu_release_device(struct device *dev)
 {
 	struct device_domain_info *info = dev_iommu_priv_get(dev);
 
-	dmar_remove_one_dev_info(dev);
+	iommu_disable_pci_caps(info);
+	domain_context_clear(info);
+	device_block_translation(dev);
+
 	intel_pasid_free_table(dev);
 	dev_iommu_priv_set(dev, NULL);
 	kfree(info);
-- 
2.34.1