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Message-Id: <20190814133841.7095-8-joro@8bytes.org>
Date: Wed, 14 Aug 2019 15:38:38 +0200
From: Joerg Roedel <joro@...tes.org>
To: Joerg Roedel <joro@...tes.org>
Cc: corbet@....net, tony.luck@...el.com, fenghua.yu@...el.com,
tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
x86@...nel.org, linux-doc@...r.kernel.org,
linux-ia64@...r.kernel.org, iommu@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org, Thomas.Lendacky@....com,
Suravee.Suthikulpanit@....com, Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 07/10] 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 e1feb4061b8b..233bc22b487e 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -93,12 +93,40 @@ 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
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