[PATCH 11/33] dma-mapping: move swiotlb arch helpers to a new header

Christoph Hellwig
2018-01-10T08:00:05Z

phys_to_dma, dma_to_phys and dma_capable are helpers published by
architecture code for use of swiotlb and xen-swiotlb only. Drivers are
not supposed to use these directly, but use the DMA API instead.

Move these to a new asm/dma-direct.h helper, included by a
linux/dma-direct.h wrapper that provides the default linear mapping
unless the architecture wants to override it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
MAINTAINERS | 1 +
arch/Kconfig | 4 +++
arch/arm/Kconfig | 1 +
arch/arm/include/asm/dma-direct.h | 36 ++++++++++++++++++++++
arch/arm/include/asm/dma-mapping.h | 31 -------------------
arch/arm64/include/asm/dma-mapping.h | 22 -------------
arch/arm64/mm/dma-mapping.c | 2 +-
arch/ia64/include/asm/dma-mapping.h | 18 -----------
arch/mips/Kconfig | 2 ++
arch/mips/include/asm/dma-direct.h | 1 +
arch/mips/include/asm/dma-mapping.h | 8 -----
.../include/asm/mach-cavium-octeon/dma-coherence.h | 8 +++++
arch/mips/include/asm/mach-generic/dma-coherence.h | 12 --------
.../include/asm/mach-loongson64/dma-coherence.h | 8 +++++
arch/powerpc/Kconfig | 1 +
arch/powerpc/include/asm/dma-direct.h | 29 +++++++++++++++++
arch/powerpc/include/asm/dma-mapping.h | 25 ---------------
arch/tile/include/asm/dma-mapping.h | 18 -----------
arch/unicore32/include/asm/dma-mapping.h | 18 -----------
arch/x86/Kconfig | 1 +
arch/x86/include/asm/dma-direct.h | 30 ++++++++++++++++++
arch/x86/include/asm/dma-mapping.h | 26 ----------------
arch/x86/kernel/amd_gart_64.c | 1 +
arch/x86/kernel/pci-dma.c | 2 +-
arch/x86/kernel/pci-nommu.c | 2 +-
arch/x86/kernel/pci-swiotlb.c | 2 +-
arch/x86/mm/mem_encrypt.c | 2 +-
arch/x86/pci/sta2x11-fixup.c | 1 +
arch/xtensa/include/asm/dma-mapping.h | 10 ------
drivers/crypto/marvell/cesa.c | 1 +
drivers/mtd/nand/qcom_nandc.c | 1 +
drivers/xen/swiotlb-xen.c | 2 +-
include/linux/dma-direct.h | 32 +++++++++++++++++++
lib/swiotlb.c | 2 +-
34 files changed, 165 insertions(+), 195 deletions(-)
create mode 100644 arch/arm/include/asm/dma-direct.h
create mode 100644 arch/mips/include/asm/dma-direct.h
create mode 100644 arch/powerpc/include/asm/dma-direct.h
create mode 100644 arch/x86/include/asm/dma-direct.h
create mode 100644 include/linux/dma-direct.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 95c3fa1f520f..d2cfdcce1db5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4338,6 +4338,7 @@ F: lib/dma-noop.c
F: lib/dma-virt.c
F: drivers/base/dma-mapping.c
F: drivers/base/dma-coherent.c
+F: include/linux/dma-direct.h
F: include/linux/dma-mapping.h

DME1737 HARDWARE MONITOR DRIVER
diff --git a/arch/Kconfig b/arch/Kconfig
index 400b9e1b2f27..3edf118ad777 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -938,6 +938,10 @@ config STRICT_MODULE_RWX
and non-text memory will be made non-executable. This provides
protection against certain security exploits (e.g. writing to text)

+# select if the architecture provides an asm/dma-direct.h header
+config ARCH_HAS_PHYS_TO_DMA
+ bool
+
config ARCH_HAS_REFCOUNT
bool
help
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 51c8df561077..00d889a37965 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -8,6 +8,7 @@ config ARM
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_SET_MEMORY
+ select ARCH_HAS_PHYS_TO_DMA
select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
select ARCH_HAS_STRICT_MODULE_RWX if MMU
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
diff --git a/arch/arm/include/asm/dma-direct.h b/arch/arm/include/asm/dma-direct.h
new file mode 100644
index 000000000000..5b0a8a421894
--- /dev/null
+++ b/arch/arm/include/asm/dma-direct.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef ASM_ARM_DMA_DIRECT_H
+#define ASM_ARM_DMA_DIRECT_H 1
+
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+ unsigned int offset = paddr & ~PAGE_MASK;
+ return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
+}
+
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
+{
+ unsigned int offset = dev_addr & ~PAGE_MASK;
+ return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
+}
+
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+ u64 limit, mask;
+
+ if (!dev->dma_mask)
+ return 0;
+
+ mask = *dev->dma_mask;
+
+ limit = (mask + 1) & ~mask;
+ if (limit && size > limit)
+ return 0;
+
+ if ((addr | (addr + size - 1)) & ~mask)
+ return 0;
+
+ return 1;
+}
+
+#endif /* ASM_ARM_DMA_DIRECT_H */
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index daf837423a76..5fb1b7fbdfbe 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -109,37 +109,6 @@ static inline bool is_device_dma_coherent(struct device *dev)
return dev->archdata.dma_coherent;
}

-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
- unsigned int offset = paddr & ~PAGE_MASK;
- return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
-{
- unsigned int offset = dev_addr & ~PAGE_MASK;
- return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
-}
-
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
- u64 limit, mask;
-
- if (!dev->dma_mask)
- return 0;
-
- mask = *dev->dma_mask;
-
- limit = (mask + 1) & ~mask;
- if (limit && size > limit)
- return 0;
-
- if ((addr | (addr + size - 1)) & ~mask)
- return 0;
-
- return 1;
-}
-
static inline void dma_mark_clean(void *addr, size_t size) { }

/**
diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
index eada887a93bf..400fa67d3b5a 100644
--- a/arch/arm64/include/asm/dma-mapping.h
+++ b/arch/arm64/include/asm/dma-mapping.h
@@ -50,28 +50,6 @@ static inline bool is_device_dma_coherent(struct device *dev)
return dev->archdata.dma_coherent;
}

-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
- dma_addr_t dev_addr = (dma_addr_t)paddr;
-
- return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
-{
- phys_addr_t paddr = (phys_addr_t)dev_addr;
-
- return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
-}
-
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
- if (!dev->dma_mask)
- return false;
-
- return addr + size - 1 <= *dev->dma_mask;
-}
-
static inline void dma_mark_clean(void *addr, size_t size)
{
}
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index b45c5bcaeccb..f3a637b98487 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -24,7 +24,7 @@
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/genalloc.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
#include <linux/dma-contiguous.h>
#include <linux/vmalloc.h>
#include <linux/swiotlb.h>
diff --git a/arch/ia64/include/asm/dma-mapping.h b/arch/ia64/include/asm/dma-mapping.h
index c1bab526a046..eabee56d995c 100644
--- a/arch/ia64/include/asm/dma-mapping.h
+++ b/arch/ia64/include/asm/dma-mapping.h
@@ -27,22 +27,4 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
return platform_dma_get_ops(NULL);
}

-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
- if (!dev->dma_mask)
- return 0;
-
- return addr + size - 1 <= *dev->dma_mask;
-}
-
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
- return paddr;
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
- return daddr;
-}
-
#endif /* _ASM_IA64_DMA_MAPPING_H */
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 350a990fc719..4b0c26b2e9b7 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -429,6 +429,7 @@ config MACH_LOONGSON32

config MACH_LOONGSON64
bool "Loongson-2/3 family of machines"
+ select ARCH_HAS_PHYS_TO_DMA
select SYS_SUPPORTS_ZBOOT
help
This enables the support of Loongson-2/3 family of machines.
@@ -877,6 +878,7 @@ config MIKROTIK_RB532
config CAVIUM_OCTEON_SOC
bool "Cavium Networks Octeon SoC based boards"
select CEVT_R4K
+ select ARCH_HAS_PHYS_TO_DMA
select ARCH_PHYS_ADDR_T_64BIT
select DMA_COHERENT
select SYS_SUPPORTS_64BIT_KERNEL
diff --git a/arch/mips/include/asm/dma-direct.h b/arch/mips/include/asm/dma-direct.h
new file mode 100644
index 000000000000..f32f15530aba
--- /dev/null
+++ b/arch/mips/include/asm/dma-direct.h
@@ -0,0 +1 @@
+#include <asm/dma-coherence.h>
diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h
index 0d9418d264f9..676c14cfc580 100644
--- a/arch/mips/include/asm/dma-mapping.h
+++ b/arch/mips/include/asm/dma-mapping.h
@@ -17,14 +17,6 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
return mips_dma_map_ops;
}

-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
- if (!dev->dma_mask)
- return false;
-
- return addr + size <= *dev->dma_mask;
-}
-
static inline void dma_mark_clean(void *addr, size_t size) {}

#define arch_setup_dma_ops arch_setup_dma_ops
diff --git a/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h b/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
index 9110988b92a1..f00833acb626 100644
--- a/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
+++ b/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
@@ -61,6 +61,14 @@ static inline void plat_post_dma_flush(struct device *dev)
{
}

+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+ if (!dev->dma_mask)
+ return false;
+
+ return addr + size <= *dev->dma_mask;
+}
+
dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);

diff --git a/arch/mips/include/asm/mach-generic/dma-coherence.h b/arch/mips/include/asm/mach-generic/dma-coherence.h
index 61addb1677e9..8ad7a40ca786 100644
--- a/arch/mips/include/asm/mach-generic/dma-coherence.h
+++ b/arch/mips/include/asm/mach-generic/dma-coherence.h
@@ -70,16 +70,4 @@ static inline void plat_post_dma_flush(struct device *dev)
}
#endif

-#ifdef CONFIG_SWIOTLB
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
- return paddr;
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
- return daddr;
-}
-#endif
-
#endif /* __ASM_MACH_GENERIC_DMA_COHERENCE_H */
diff --git a/arch/mips/include/asm/mach-loongson64/dma-coherence.h b/arch/mips/include/asm/mach-loongson64/dma-coherence.h
index 1602a9e9e8c2..5cfda8f893e9 100644
--- a/arch/mips/include/asm/mach-loongson64/dma-coherence.h
+++ b/arch/mips/include/asm/mach-loongson64/dma-coherence.h
@@ -17,6 +17,14 @@

struct device;

+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+ if (!dev->dma_mask)
+ return false;
+
+ return addr + size <= *dev->dma_mask;
+}
+
extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c51e6ce42e7a..887285eb684a 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -139,6 +139,7 @@ config PPC
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
+ select ARCH_HAS_PHYS_TO_DMA
select ARCH_HAS_PMEM_API if PPC64
select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
select ARCH_HAS_SG_CHAIN
diff --git a/arch/powerpc/include/asm/dma-direct.h b/arch/powerpc/include/asm/dma-direct.h
new file mode 100644
index 000000000000..a5b59c765426
--- /dev/null
+++ b/arch/powerpc/include/asm/dma-direct.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef ASM_POWERPC_DMA_DIRECT_H
+#define ASM_POWERPC_DMA_DIRECT_H 1
+
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+#ifdef CONFIG_SWIOTLB
+ struct dev_archdata *sd = &dev->archdata;
+
+ if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr)
+ return false;
+#endif
+
+ if (!dev->dma_mask)
+ return false;
+
+ return addr + size - 1 <= *dev->dma_mask;
+}
+
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+ return paddr + get_dma_offset(dev);
+}
+
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+{
+ return daddr - get_dma_offset(dev);
+}
+#endif /* ASM_POWERPC_DMA_DIRECT_H */
diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index 592c7f418aa0..f6ab51205a85 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -112,31 +112,6 @@ extern int dma_set_mask(struct device *dev, u64 dma_mask);

extern u64 __dma_get_required_mask(struct device *dev);

-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
-#ifdef CONFIG_SWIOTLB
- struct dev_archdata *sd = &dev->archdata;
-
- if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr)
- return false;
-#endif
-
- if (!dev->dma_mask)
- return false;
-
- return addr + size - 1 <= *dev->dma_mask;
-}
-
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
- return paddr + get_dma_offset(dev);
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
- return daddr - get_dma_offset(dev);
-}
-
#define ARCH_HAS_DMA_MMAP_COHERENT

#endif /* __KERNEL__ */
diff --git a/arch/tile/include/asm/dma-mapping.h b/arch/tile/include/asm/dma-mapping.h
index 97ad62878290..75b8aaa4e70b 100644
--- a/arch/tile/include/asm/dma-mapping.h
+++ b/arch/tile/include/asm/dma-mapping.h
@@ -44,26 +44,8 @@ static inline void set_dma_offset(struct device *dev, dma_addr_t off)
dev->archdata.dma_offset = off;
}

-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
- return paddr;
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
- return daddr;
-}
-
static inline void dma_mark_clean(void *addr, size_t size) {}

-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
- if (!dev->dma_mask)
- return 0;
-
- return addr + size - 1 <= *dev->dma_mask;
-}
-
#define HAVE_ARCH_DMA_SET_MASK 1
int dma_set_mask(struct device *dev, u64 mask);

diff --git a/arch/unicore32/include/asm/dma-mapping.h b/arch/unicore32/include/asm/dma-mapping.h
index ac608c2f6af6..5cb250bf2d8c 100644
--- a/arch/unicore32/include/asm/dma-mapping.h
+++ b/arch/unicore32/include/asm/dma-mapping.h
@@ -25,24 +25,6 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
return &swiotlb_dma_map_ops;
}

-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
- if (dev && dev->dma_mask)
- return addr + size - 1 <= *dev->dma_mask;
-
- return 1;
-}
-
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
- return paddr;
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
- return daddr;
-}
-
static inline void dma_mark_clean(void *addr, size_t size) {}

#endif /* __KERNEL__ */
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d4fc98c50378..f6f4328103c0 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -54,6 +54,7 @@ config X86
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_KCOV if X86_64
+ select ARCH_HAS_PHYS_TO_DMA
select ARCH_HAS_PMEM_API if X86_64
# Causing hangs/crashes, see the commit that added this change for details.
select ARCH_HAS_REFCOUNT
diff --git a/arch/x86/include/asm/dma-direct.h b/arch/x86/include/asm/dma-direct.h
new file mode 100644
index 000000000000..1295bc622ebe
--- /dev/null
+++ b/arch/x86/include/asm/dma-direct.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef ASM_X86_DMA_DIRECT_H
+#define ASM_X86_DMA_DIRECT_H 1
+
+#include <linux/mem_encrypt.h>
+
+#ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */
+bool dma_capable(struct device *dev, dma_addr_t addr, size_t size);
+dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
+phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
+#else
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+ if (!dev->dma_mask)
+ return 0;
+
+ return addr + size - 1 <= *dev->dma_mask;
+}
+
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+ return __sme_set(paddr);
+}
+
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+{
+ return __sme_clr(daddr);
+}
+#endif /* CONFIG_X86_DMA_REMAP */
+#endif /* ASM_X86_DMA_DIRECT_H */
diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index 0350d99bb8fd..dfdc9357a349 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -12,7 +12,6 @@
#include <asm/io.h>
#include <asm/swiotlb.h>
#include <linux/dma-contiguous.h>
-#include <linux/mem_encrypt.h>

#ifdef CONFIG_ISA
# define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
@@ -42,31 +41,6 @@ extern void dma_generic_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_addr,
unsigned long attrs);

-#ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */
-extern bool dma_capable(struct device *dev, dma_addr_t addr, size_t size);
-extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
-extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
-#else
-
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
- if (!dev->dma_mask)
- return 0;
-
- return addr + size - 1 <= *dev->dma_mask;
-}
-
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
- return __sme_set(paddr);
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
- return __sme_clr(daddr);
-}
-#endif /* CONFIG_X86_DMA_REMAP */
-
static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
gfp_t gfp)
{
diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
index cc0e8bc0ea3f..ecd486cb06ab 100644
--- a/arch/x86/kernel/amd_gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c
@@ -31,6 +31,7 @@
#include <linux/io.h>
#include <linux/gfp.h>
#include <linux/atomic.h>
+#include <linux/dma-direct.h>
#include <asm/mtrr.h>
#include <asm/pgtable.h>
#include <asm/proto.h>
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 599d7462eccc..8439e6de6156 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
#include <linux/dma-debug.h>
#include <linux/dmar.h>
#include <linux/export.h>
diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index b0caae27e1b7..618285e475c6 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c
@@ -1,7 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/* Fallback functions when the main IOMMU code is not compiled in. This
code is roughly equivalent to i386. */
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
#include <linux/scatterlist.h>
#include <linux/string.h>
#include <linux/gfp.h>
diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index 53bd05ea90d8..9d3e35c33d94 100644
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c
@@ -6,7 +6,7 @@
#include <linux/init.h>
#include <linux/swiotlb.h>
#include <linux/bootmem.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
#include <linux/mem_encrypt.h>

#include <asm/iommu.h>
diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 391b13402e40..09532c935da0 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -15,7 +15,7 @@
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/mm.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
#include <linux/swiotlb.h>
#include <linux/mem_encrypt.h>

diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c
index 53d600217973..75577c1490c4 100644
--- a/arch/x86/pci/sta2x11-fixup.c
+++ b/arch/x86/pci/sta2x11-fixup.c
@@ -26,6 +26,7 @@
#include <linux/pci_ids.h>
#include <linux/export.h>
#include <linux/list.h>
+#include <linux/dma-direct.h>
#include <asm/iommu.h>

#define STA2X11_SWIOTLB_SIZE (4*1024*1024)
diff --git a/arch/xtensa/include/asm/dma-mapping.h b/arch/xtensa/include/asm/dma-mapping.h
index 153bf2370988..44098800dad7 100644
--- a/arch/xtensa/include/asm/dma-mapping.h
+++ b/arch/xtensa/include/asm/dma-mapping.h
@@ -23,14 +23,4 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
return &xtensa_dma_map_ops;
}

-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
- return (dma_addr_t)paddr;
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
- return (phys_addr_t)daddr;
-}
-
#endif /* _XTENSA_DMA_MAPPING_H */
diff --git a/drivers/crypto/marvell/cesa.c b/drivers/crypto/marvell/cesa.c
index 293832488cc9..3a0c40081ffb 100644
--- a/drivers/crypto/marvell/cesa.c
+++ b/drivers/crypto/marvell/cesa.c
@@ -24,6 +24,7 @@
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/dma-direct.h> /* XXX: drivers shall never use this directly! */
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_platform.h>
diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c
index 2656c1ac5646..411cdfd12a85 100644
--- a/drivers/mtd/nand/qcom_nandc.c
+++ b/drivers/mtd/nand/qcom_nandc.c
@@ -23,6 +23,7 @@
#include <linux/of_device.h>
#include <linux/delay.h>
#include <linux/dma/qcom_bam_dma.h>
+#include <linux/dma-direct.h> /* XXX: drivers shall never use this directly! */

/* NANDc reg offsets */
#define NAND_FLASH_CMD 0x00
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 82fc54f8eb77..5bb72d3f8337 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -36,7 +36,7 @@
#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt

#include <linux/bootmem.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
#include <linux/export.h>
#include <xen/swiotlb-xen.h>
#include <xen/page.h>
diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
new file mode 100644
index 000000000000..2cc1b6558944
--- /dev/null
+++ b/include/linux/dma-direct.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_DMA_DIRECT_H
+#define _LINUX_DMA_DIRECT_H 1
+
+#include <linux/dma-mapping.h>
+
+#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
+#include <asm/dma-direct.h>
+#else
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+ dma_addr_t dev_addr = (dma_addr_t)paddr;
+
+ return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
+}
+
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
+{
+ phys_addr_t paddr = (phys_addr_t)dev_addr;
+
+ return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
+}
+
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+ if (!dev->dma_mask)
+ return false;
+
+ return addr + size - 1 <= *dev->dma_mask;
+}
+#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
+#endif /* _LINUX_DMA_DIRECT_H */
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index cea19aaf303c..6583f3512386 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -18,7 +18,7 @@
*/

#include <linux/cache.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
#include <linux/mm.h>
#include <linux/export.h>
#include <linux/spinlock.h>
--
2.14.2