linux-kernel - [PATCH v3 7/9] iommu/vt-d: Allocate and free pasid table

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Date:   Tue, 19 Jun 2018 13:17:27 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     ashok.raj@...el.com, sanjay.k.kumar@...el.com,
        jacob.jun.pan@...el.com, kevin.tian@...el.com, yi.l.liu@...el.com,
        yi.y.sun@...el.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v3 7/9] iommu/vt-d: Allocate and free pasid table

This patch allocates a PASID table for a PCI device at the time
when the dmar dev_info is attached to dev->archdata.iommu, and
free it in the opposite case.

Cc: Ashok Raj <ashok.raj@...el.com>
Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc: Kevin Tian <kevin.tian@...el.com>
Cc: Liu Yi L <yi.l.liu@...el.com>
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Reviewed-by: Liu Yi L <yi.l.liu@...el.com>
---
 drivers/iommu/intel-iommu.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 44ce77a..43bf151 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2494,6 +2494,15 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
 	list_add(&info->global, &device_domain_list);
 	if (dev)
 		dev->archdata.iommu = info;
+
+	if (dev && dev_is_pci(dev) && info->pasid_supported) {
+		ret = intel_pasid_alloc_table(dev);
+		if (ret) {
+			__dmar_remove_one_dev_info(info);
+			spin_unlock_irqrestore(&device_domain_lock, flags);
+			return NULL;
+		}
+	}
 	spin_unlock_irqrestore(&device_domain_lock, flags);
 
 	if (dev && domain_context_mapping(domain, dev)) {
@@ -4828,6 +4837,7 @@ static void __dmar_remove_one_dev_info(struct device_domain_info *info)
 	if (info->dev) {
 		iommu_disable_dev_iotlb(info);
 		domain_context_clear(iommu, info->dev);
+		intel_pasid_free_table(info->dev);
 	}
 
 	unlink_domain_info(info);
-- 
2.7.4