From dc2acded38957dfa6b7b7e0203b4b8cb8d818ce6 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Fri, 21 Dec 2018 22:14:44 +0100
Subject: [PATCH] dma-mapping: add a kconfig symbol for arch_teardown_dma_ops
availability
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com> # arm64
---
arch/arm/Kconfig | 1 +
arch/arm/include/asm/dma-mapping.h | 5 -----
arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/dma-mapping.h | 5 -----
include/linux/dma-mapping.h | 10 +++++++---
kernel/dma/Kconfig | 3 +++
6 files changed, 12 insertions(+), 13 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index c1cf44f008709e..4bb36ae71b1440 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -16,6 +16,7 @@ config ARM
select ARCH_HAS_SET_MEMORY
select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
select ARCH_HAS_STRICT_MODULE_RWX if MMU
+ select ARCH_HAS_TEARDOWN_DMA_OPS if MMU
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAVE_CUSTOM_GPIO_H
select ARCH_HAS_GCOV_PROFILE_ALL
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index a224b6e39e5805..03ba90ffc0f8f1 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -96,11 +96,6 @@ static inline unsigned long dma_max_pfn(struct device *dev)
}
#define dma_max_pfn(dev) dma_max_pfn(dev)
-#ifdef CONFIG_MMU
-#define arch_teardown_dma_ops arch_teardown_dma_ops
-extern void arch_teardown_dma_ops(struct device *dev);
-#endif
-
/* do not use this function in a driver */
static inline bool is_device_dma_coherent(struct device *dev)
{
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 63909f318d56d3..87ec7be25e97df 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -29,6 +29,7 @@ config ARM64
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_SYSCALL_WRAPPER
+ select ARCH_HAS_TEARDOWN_DMA_OPS if IOMMU_SUPPORT
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select ARCH_INLINE_READ_LOCK if !PREEMPT
diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
index de96507ee2c13e..de98191e4c7d40 100644
--- a/arch/arm64/include/asm/dma-mapping.h
+++ b/arch/arm64/include/asm/dma-mapping.h
@@ -29,11 +29,6 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
return NULL;
}
-#ifdef CONFIG_IOMMU_DMA
-void arch_teardown_dma_ops(struct device *dev);
-#define arch_teardown_dma_ops arch_teardown_dma_ops
-#endif
-
/*
* Do not use this function in a driver, it is only provided for
* arch/arm/mm/xen.c, which is used by arm64 as well.
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 2b20d60e615896..4210c5c1dd2153 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -681,9 +681,13 @@ static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
}
#endif /* CONFIG_ARCH_HAS_SETUP_DMA_OPS */
-#ifndef arch_teardown_dma_ops
-static inline void arch_teardown_dma_ops(struct device *dev) { }
-#endif
+#ifdef CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS
+void arch_teardown_dma_ops(struct device *dev);
+#else
+static inline void arch_teardown_dma_ops(struct device *dev)
+{
+}
+#endif /* CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS */
static inline unsigned int dma_get_max_seg_size(struct device *dev)
{
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 6014cad35e5821..bde9179c6ed709 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -22,6 +22,9 @@ config HAVE_GENERIC_DMA_COHERENT
config ARCH_HAS_SETUP_DMA_OPS
bool
+config ARCH_HAS_TEARDOWN_DMA_OPS
+ bool
+
config ARCH_HAS_SYNC_DMA_FOR_DEVICE
bool
--
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