linux-kernel - [PATCH v4 6/6] iommu/vt-d: Delete unused SVM flag

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Date:   Wed, 18 May 2022 11:21:20 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>, dmaengine@...r.kernel.org,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        "Christoph Hellwig" <hch@...radead.org>, vkoul@...nel.org,
        robin.murphy@....com, will@...nel.org
Cc:     Yi Liu <yi.l.liu@...el.com>, Dave Jiang <dave.jiang@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Eric Auger <eric.auger@...hat.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v4 6/6] iommu/vt-d: Delete unused SVM flag

Supervisor PASID for SVA/SVM is no longer supported, delete the unused
flag.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 drivers/iommu/intel/svm.c |  2 +-
 include/linux/intel-svm.h | 13 -------------
 2 files changed, 1 insertion(+), 14 deletions(-)

diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 44331db060e4..5b220d464218 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -750,7 +750,7 @@ static irqreturn_t prq_event_thread(int irq, void *d)
 			 * to unbind the mm while any page faults are outstanding.
 			 */
 			svm = pasid_private_find(req->pasid);
-			if (IS_ERR_OR_NULL(svm) || (svm->flags & SVM_FLAG_SUPERVISOR_MODE))
+			if (IS_ERR_OR_NULL(svm))
 				goto bad_req;
 		}
 
diff --git a/include/linux/intel-svm.h b/include/linux/intel-svm.h
index b3b125b332aa..6835a665c195 100644
--- a/include/linux/intel-svm.h
+++ b/include/linux/intel-svm.h
@@ -13,17 +13,4 @@
 #define PRQ_RING_MASK	((0x1000 << PRQ_ORDER) - 0x20)
 #define PRQ_DEPTH	((0x1000 << PRQ_ORDER) >> 5)
 
-/*
- * The SVM_FLAG_SUPERVISOR_MODE flag requests a PASID which can be used only
- * for access to kernel addresses. No IOTLB flushes are automatically done
- * for kernel mappings; it is valid only for access to the kernel's static
- * 1:1 mapping of physical memory — not to vmalloc or even module mappings.
- * A future API addition may permit the use of such ranges, by means of an
- * explicit IOTLB flush call (akin to the DMA API's unmap method).
- *
- * It is unlikely that we will ever hook into flush_tlb_kernel_range() to
- * do such IOTLB flushes automatically.
- */
-#define SVM_FLAG_SUPERVISOR_MODE	BIT(0)
-
 #endif /* __INTEL_SVM_H__ */
-- 
2.25.1