linux-kernel - [PATCH v12 09/17] iommu/vt-d: Add blocking domain support

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Date:   Fri, 26 Aug 2022 20:11:33 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>, Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Vinod Koul <vkoul@...nel.org>
Cc:     Eric Auger <eric.auger@...hat.com>, Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        Zhangfei Gao <zhangfei.gao@...aro.org>,
        Zhu Tony <tony.zhu@...el.com>, iommu@...ts.linux.dev,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH v12 09/17] iommu/vt-d: Add blocking domain support

The Intel IOMMU hardwares support blocking DMA transactions by clearing
the translation table entries. This implements a real blocking domain to
avoid using an empty UNMANAGED domain. The detach_dev callback of the
domain ops is not used in any path. Remove it to avoid dead code as well.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Tested-by: Tony Zhu <tony.zhu@...el.com>
---
 drivers/iommu/intel/iommu.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 64d30895a4c8..ffd1ff69bf25 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4127,12 +4127,30 @@ static int md_domain_init(struct dmar_domain *domain, int guest_width)
 	return 0;
 }
 
+/*
+ * Intel IOMMU blocking domain support:
+ */
+static int blocking_domain_attach_dev(struct iommu_domain *domain,
+				      struct device *dev)
+{
+	dmar_remove_one_dev_info(dev);
+	return 0;
+}
+
+static struct iommu_domain blocking_domain = {
+	.ops = &(const struct iommu_domain_ops) {
+		.attach_dev	= blocking_domain_attach_dev
+	}
+};
+
 static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
 {
 	struct dmar_domain *dmar_domain;
 	struct iommu_domain *domain;
 
 	switch (type) {
+	case IOMMU_DOMAIN_BLOCKED:
+		return &blocking_domain;
 	case IOMMU_DOMAIN_DMA:
 	case IOMMU_DOMAIN_DMA_FQ:
 	case IOMMU_DOMAIN_UNMANAGED:
@@ -4239,12 +4257,6 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
 	return domain_add_dev_info(to_dmar_domain(domain), dev);
 }
 
-static void intel_iommu_detach_device(struct iommu_domain *domain,
-				      struct device *dev)
-{
-	dmar_remove_one_dev_info(dev);
-}
-
 static int intel_iommu_map(struct iommu_domain *domain,
 			   unsigned long iova, phys_addr_t hpa,
 			   size_t size, int iommu_prot, gfp_t gfp)
@@ -4767,7 +4779,6 @@ const struct iommu_ops intel_iommu_ops = {
 #endif
 	.default_domain_ops = &(const struct iommu_domain_ops) {
 		.attach_dev		= intel_iommu_attach_device,
-		.detach_dev		= intel_iommu_detach_device,
 		.map_pages		= intel_iommu_map_pages,
 		.unmap_pages		= intel_iommu_unmap_pages,
 		.iotlb_sync_map		= intel_iommu_iotlb_sync_map,
-- 
2.25.1