linux-kernel - [PATCH] iommu: Print default strict or lazy mode at init time

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Date:   Fri, 28 May 2021 21:37:54 +0800
From:   John Garry <john.garry@...wei.com>
To:     <joro@...tes.org>, <will@...nel.org>
CC:     <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
        <hch@....de>, <robin.murphy@....com>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH] iommu: Print default strict or lazy mode at init time

As well as the default domain type, it's useful to know whether strict
or lazy mode is default for DMA domains, so add this info in a separate
print.

Signed-off-by: John Garry <john.garry@...wei.com>

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 808ab70d5df5..f25fae62f077 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -138,6 +138,11 @@ static int __init iommu_subsys_init(void)
 		(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API) ?
 			"(set via kernel command line)" : "");
 
+	pr_info("Default DMA domain mode: %s %s\n",
+		iommu_dma_strict ? "strict" : "lazy",
+		(iommu_cmd_line & IOMMU_CMD_LINE_STRICT) ?
+			"(set via kernel command line)" : "");
+
 	return 0;
 }
 subsys_initcall(iommu_subsys_init);
-- 
2.26.2