linux-kernel - [PATCH 1/3] iommu: Print default domain type on boot

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Message-Id: <20190809152233.2829-2-joro@8bytes.org>
Date:   Fri,  9 Aug 2019 17:22:31 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Joerg Roedel <joro@...tes.org>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Thomas.Lendacky@....com, Suravee.Suthikulpanit@....com,
        bp@...en8.de, Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 1/3] iommu: Print default domain type on boot

From: Joerg Roedel <jroedel@...e.de>

Introduce a subsys_initcall for IOMMU code and use it to
print the default domain type at boot.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/iommu.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 0c674d80c37f..b57ce00c1310 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -80,12 +80,40 @@ struct iommu_group_attribute iommu_group_attr_##_name =		\
 static LIST_HEAD(iommu_device_list);
 static DEFINE_SPINLOCK(iommu_device_lock);
 
+/*
+ * Use a function instead of an array here because the domain-type is a
+ * bit-field, so an array would waste memory.
+ */
+static const char *iommu_domain_type_str(unsigned int t)
+{
+	switch (t) {
+		case IOMMU_DOMAIN_BLOCKED:
+			return "Blocked";
+		case IOMMU_DOMAIN_IDENTITY:
+			return "Passthrough";
+		case IOMMU_DOMAIN_UNMANAGED:
+			return "Unmanaged";
+		case IOMMU_DOMAIN_DMA:
+			return "Translated";
+		default:
+			return "Unknown";
+	}
+}
+
+static int __init iommu_subsys_init(void)
+{
+	pr_info("Default domain type: %s\n",
+		iommu_domain_type_str(iommu_def_domain_type));
+
+	return 0;
+}
+subsys_initcall(iommu_subsys_init);
+
 int iommu_device_register(struct iommu_device *iommu)
 {
 	spin_lock(&iommu_device_lock);
 	list_add_tail(&iommu->list, &iommu_device_list);
 	spin_unlock(&iommu_device_lock);
-
 	return 0;
 }
 
-- 
2.17.1