linux-kernel - [PATCH 2/2] iommu/vt-d: Loose requirement for flush queue initializaton

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Date:   Thu, 19 Dec 2019 13:18:51 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     David Woodhouse <dwmw2@...radead.org>, ashok.raj@...el.com,
        jacob.jun.pan@...el.com, kevin.tian@...el.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH 2/2] iommu/vt-d: Loose requirement for flush queue initializaton

Currently if flush queue initialization fails, we return error
or enforce the system-wide strict mode. These are unnecessary
because we always check the existence of a flush queue before
queuing any iova's for lazy flushing. Printing a informational
message is enough.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel-iommu.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 93e1d7c3ac7c..65eee8cf6d59 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1854,15 +1854,15 @@ static int domain_init(struct dmar_domain *domain, struct intel_iommu *iommu,
 {
 	int adjust_width, agaw;
 	unsigned long sagaw;
-	int err;
+	int ret;
 
 	init_iova_domain(&domain->iovad, VTD_PAGE_SIZE, IOVA_START_PFN);
 
 	if (!intel_iommu_strict) {
-		err = init_iova_flush_queue(&domain->iovad,
+		ret = init_iova_flush_queue(&domain->iovad,
 					    iommu_flush_iova, iova_entry_free);
-		if (err)
-			return err;
+		if (ret)
+			pr_info("iova flush queue initialization failed\n");
 	}
 
 	domain_reserve_special_ranges(domain);
@@ -5222,10 +5222,8 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
 			ret = init_iova_flush_queue(&dmar_domain->iovad,
 						    iommu_flush_iova,
 						    iova_entry_free);
-			if (ret) {
-				pr_warn("iova flush queue initialization failed\n");
-				intel_iommu_strict = 1;
-			}
+			if (ret)
+				pr_info("iova flush queue initialization failed\n");
 		}
 
 		domain_update_iommu_cap(dmar_domain);
-- 
2.17.1