linux-kernel - [PATCH 01/10] iommu: Add helpers to set/get default domain type

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Message-Id: <20190814133841.7095-2-joro@8bytes.org>
Date:   Wed, 14 Aug 2019 15:38:32 +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 01/10] iommu: Add helpers to set/get default domain type

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

Add a couple of functions to allow changing the default
domain type from architecture code and a function for iommu
drivers to request whether the default domain is
passthrough.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/iommu.c | 16 ++++++++++++++++
 include/linux/iommu.h | 16 ++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 0c674d80c37f..f187e85a074b 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2196,6 +2196,22 @@ int iommu_request_dma_domain_for_dev(struct device *dev)
 	return request_default_domain_for_dev(dev, IOMMU_DOMAIN_DMA);
 }
 
+void iommu_set_default_passthrough(void)
+{
+	iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY;
+}
+
+void iommu_set_default_translated(void)
+{
+	iommu_def_domain_type = IOMMU_DOMAIN_DMA;
+}
+
+bool iommu_default_passthrough(void)
+{
+	return iommu_def_domain_type == IOMMU_DOMAIN_IDENTITY;
+}
+EXPORT_SYMBOL_GPL(iommu_default_passthrough);
+
 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
 {
 	const struct iommu_ops *ops = NULL;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index fdc355ccc570..58c3e3e5f157 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -413,6 +413,9 @@ extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
 extern int iommu_request_dm_for_dev(struct device *dev);
 extern int iommu_request_dma_domain_for_dev(struct device *dev);
+extern void iommu_set_default_passthrough(void);
+extern void iommu_set_default_translated(void);
+extern bool iommu_default_passthrough(void);
 extern struct iommu_resv_region *
 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
 			enum iommu_resv_type type);
@@ -694,6 +697,19 @@ static inline int iommu_request_dma_domain_for_dev(struct device *dev)
 	return -ENODEV;
 }
 
+static inline void iommu_set_default_passthrough(void)
+{
+}
+
+static inline void iommu_set_default_translated(void)
+{
+}
+
+static inline bool iommu_default_passthrough(void)
+{
+	return true;
+}
+
 static inline int iommu_attach_group(struct iommu_domain *domain,
 				     struct iommu_group *group)
 {
-- 
2.17.1