linux-kernel - [PATCH 04/12] iommu/vt-d: Use pci_get_domain_bus_and_slot() in pgtable

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Message-Id: <20220527063019.3112905-5-baolu.lu@linux.intel.com>
Date:   Fri, 27 May 2022 14:30:11 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>, Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     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>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH 04/12] iommu/vt-d: Use pci_get_domain_bus_and_slot() in pgtable_walk()

Use pci_get_domain_bus_and_slot() instead of searching the global list
to retrieve the pci device pointer. This removes device_domain_list
global list as there are no consumers anymore.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel/iommu.h |  1 -
 drivers/iommu/intel/iommu.c | 33 ++++++---------------------------
 2 files changed, 6 insertions(+), 28 deletions(-)

diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
index 2f4a5b9509c0..6724703d573b 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -609,7 +609,6 @@ struct intel_iommu {
 /* PCI domain-device relationship */
 struct device_domain_info {
 	struct list_head link;	/* link to domain siblings */
-	struct list_head global; /* link to global list */
 	struct list_head table;	/* link to pasid table */
 	u32 segment;		/* PCI segment number */
 	u8 bus;			/* PCI bus number */
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 25d4c5200526..bbdd3417a1b1 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -131,8 +131,6 @@ static struct intel_iommu **g_iommus;
 
 static void __init check_tylersburg_isoch(void);
 static int rwbf_quirk;
-static inline struct device_domain_info *
-dmar_search_domain_by_dev_info(int segment, int bus, int devfn);
 
 /*
  * set to 1 to panic kernel if can't successfully enable VT-d
@@ -315,7 +313,6 @@ static int iommu_skip_te_disable;
 #define IDENTMAP_AZALIA		4
 
 static DEFINE_SPINLOCK(device_domain_lock);
-static LIST_HEAD(device_domain_list);
 const struct iommu_ops intel_iommu_ops;
 
 static bool translation_pre_enabled(struct intel_iommu *iommu)
@@ -845,9 +842,14 @@ static void pgtable_walk(struct intel_iommu *iommu, unsigned long pfn, u8 bus, u
 	struct device_domain_info *info;
 	struct dma_pte *parent, *pte;
 	struct dmar_domain *domain;
+	struct pci_dev *pdev;
 	int offset, level;
 
-	info = dmar_search_domain_by_dev_info(iommu->segment, bus, devfn);
+	pdev = pci_get_domain_bus_and_slot(iommu->segment, bus, devfn);
+	if (!pdev)
+		return;
+
+	info = dev_iommu_priv_get(&pdev->dev);
 	if (!info || !info->domain) {
 		pr_info("device [%02x:%02x.%d] not probed\n",
 			bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
@@ -2348,19 +2350,6 @@ static void domain_remove_dev_info(struct dmar_domain *domain)
 	spin_unlock_irqrestore(&device_domain_lock, flags);
 }
 
-static inline struct device_domain_info *
-dmar_search_domain_by_dev_info(int segment, int bus, int devfn)
-{
-	struct device_domain_info *info;
-
-	list_for_each_entry(info, &device_domain_list, global)
-		if (info->segment == segment && info->bus == bus &&
-		    info->devfn == devfn)
-			return info;
-
-	return NULL;
-}
-
 static int domain_setup_first_level(struct intel_iommu *iommu,
 				    struct dmar_domain *domain,
 				    struct device *dev,
@@ -4564,7 +4553,6 @@ static struct iommu_device *intel_iommu_probe_device(struct device *dev)
 	struct pci_dev *pdev = dev_is_pci(dev) ? to_pci_dev(dev) : NULL;
 	struct device_domain_info *info;
 	struct intel_iommu *iommu;
-	unsigned long flags;
 	u8 bus, devfn;
 
 	iommu = device_to_iommu(dev, &bus, &devfn);
@@ -4607,10 +4595,7 @@ static struct iommu_device *intel_iommu_probe_device(struct device *dev)
 		}
 	}
 
-	spin_lock_irqsave(&device_domain_lock, flags);
-	list_add(&info->global, &device_domain_list);
 	dev_iommu_priv_set(dev, info);
-	spin_unlock_irqrestore(&device_domain_lock, flags);
 
 	return &iommu->iommu;
 }
@@ -4618,15 +4603,9 @@ static struct iommu_device *intel_iommu_probe_device(struct device *dev)
 static void intel_iommu_release_device(struct device *dev)
 {
 	struct device_domain_info *info = dev_iommu_priv_get(dev);
-	unsigned long flags;
 
 	dmar_remove_one_dev_info(dev);
-
-	spin_lock_irqsave(&device_domain_lock, flags);
 	dev_iommu_priv_set(dev, NULL);
-	list_del(&info->global);
-	spin_unlock_irqrestore(&device_domain_lock, flags);
-
 	kfree(info);
 	set_dma_ops(dev, NULL);
 }
-- 
2.25.1