centralize SWIOTLB config symbol and misc other cleanups V2

centralize SWIOTLB config symbol and misc other cleanups V2

[Christoph Hellwig]

Hi all,

this seris aims for a single defintion of the Kconfig symbol.  To get
there various cleanups, mostly about config symbols are included as well.

Chances since V2 are a fixed s/Reviewed/Signed-Off/ for me, and a few
reviewed-by tags.  I'd like to start merging this into the dma-mapping
tree rather sooner than later given that quite a bit of material for
this series depends on it.

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[PATCH 01/12] iommu-common: move to arch/sparc

[Christoph Hellwig]

This code is only used by sparc, and all new iommu drivers should use the
drivers/iommu/ framework.  Also remove the unused exports.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
 {include/linux => arch/sparc/include/asm}/iommu-common.h | 0
 arch/sparc/include/asm/iommu_64.h                        | 2 +-
 arch/sparc/kernel/Makefile                               | 2 +-
 {lib => arch/sparc/kernel}/iommu-common.c                | 5 +----
 arch/sparc/kernel/iommu.c                                | 2 +-
 arch/sparc/kernel/ldc.c                                  | 2 +-
 arch/sparc/kernel/pci_sun4v.c                            | 2 +-
 lib/Makefile                                             | 2 +-
 8 files changed, 7 insertions(+), 10 deletions(-)
 rename {include/linux => arch/sparc/include/asm}/iommu-common.h (100%)
 rename {lib => arch/sparc/kernel}/iommu-common.c (98%)

diff --git a/include/linux/iommu-common.h b/arch/sparc/include/asm/iommu-common.h
similarity index 100%
rename from include/linux/iommu-common.h
rename to arch/sparc/include/asm/iommu-common.h
diff --git a/arch/sparc/include/asm/iommu_64.h b/arch/sparc/include/asm/iommu_64.h
index 9ed6b54caa4b..0ef6dedf747e 100644
--- a/arch/sparc/include/asm/iommu_64.h
+++ b/arch/sparc/include/asm/iommu_64.h
@@ -17,7 +17,7 @@
 #define IOPTE_WRITE   0x0000000000000002UL
 
 #define IOMMU_NUM_CTXS	4096
-#include <linux/iommu-common.h>
+#include <asm/iommu-common.h>
 
 struct iommu_arena {
 	unsigned long	*map;
diff --git a/arch/sparc/kernel/Makefile b/arch/sparc/kernel/Makefile
index 76cb57750dda..a284662b0e4c 100644
--- a/arch/sparc/kernel/Makefile
+++ b/arch/sparc/kernel/Makefile
@@ -59,7 +59,7 @@ obj-$(CONFIG_SPARC32)   += leon_pmc.o
 
 obj-$(CONFIG_SPARC64)   += reboot.o
 obj-$(CONFIG_SPARC64)   += sysfs.o
-obj-$(CONFIG_SPARC64)   += iommu.o
+obj-$(CONFIG_SPARC64)   += iommu.o iommu-common.o
 obj-$(CONFIG_SPARC64)   += central.o
 obj-$(CONFIG_SPARC64)   += starfire.o
 obj-$(CONFIG_SPARC64)   += power.o
diff --git a/lib/iommu-common.c b/arch/sparc/kernel/iommu-common.c
similarity index 98%
rename from lib/iommu-common.c
rename to arch/sparc/kernel/iommu-common.c
index 55b00de106b5..59cb16691322 100644
--- a/lib/iommu-common.c
+++ b/arch/sparc/kernel/iommu-common.c
@@ -8,9 +8,9 @@
 #include <linux/bitmap.h>
 #include <linux/bug.h>
 #include <linux/iommu-helper.h>
-#include <linux/iommu-common.h>
 #include <linux/dma-mapping.h>
 #include <linux/hash.h>
+#include <asm/iommu-common.h>
 
 static unsigned long iommu_large_alloc = 15;
 
@@ -93,7 +93,6 @@ void iommu_tbl_pool_init(struct iommu_map_table *iommu,
 	p->hint = p->start;
 	p->end = num_entries;
 }
-EXPORT_SYMBOL(iommu_tbl_pool_init);
 
 unsigned long iommu_tbl_range_alloc(struct device *dev,
 				struct iommu_map_table *iommu,
@@ -224,7 +223,6 @@ unsigned long iommu_tbl_range_alloc(struct device *dev,
 
 	return n;
 }
-EXPORT_SYMBOL(iommu_tbl_range_alloc);
 
 static struct iommu_pool *get_pool(struct iommu_map_table *tbl,
 				   unsigned long entry)
@@ -264,4 +262,3 @@ void iommu_tbl_range_free(struct iommu_map_table *iommu, u64 dma_addr,
 	bitmap_clear(iommu->map, entry, npages);
 	spin_unlock_irqrestore(&(pool->lock), flags);
 }
-EXPORT_SYMBOL(iommu_tbl_range_free);
diff --git a/arch/sparc/kernel/iommu.c b/arch/sparc/kernel/iommu.c
index b08dc3416f06..40d008b0bd3e 100644
--- a/arch/sparc/kernel/iommu.c
+++ b/arch/sparc/kernel/iommu.c
@@ -14,7 +14,7 @@
 #include <linux/errno.h>
 #include <linux/iommu-helper.h>
 #include <linux/bitmap.h>
-#include <linux/iommu-common.h>
+#include <asm/iommu-common.h>
 
 #ifdef CONFIG_PCI
 #include <linux/pci.h>
diff --git a/arch/sparc/kernel/ldc.c b/arch/sparc/kernel/ldc.c
index 86b625f9d8dc..c0fa3ef6cf01 100644
--- a/arch/sparc/kernel/ldc.c
+++ b/arch/sparc/kernel/ldc.c
@@ -16,7 +16,7 @@
 #include <linux/list.h>
 #include <linux/init.h>
 #include <linux/bitmap.h>
-#include <linux/iommu-common.h>
+#include <asm/iommu-common.h>
 
 #include <asm/hypervisor.h>
 #include <asm/iommu.h>
diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c
index 249367228c33..565d9ac883d0 100644
--- a/arch/sparc/kernel/pci_sun4v.c
+++ b/arch/sparc/kernel/pci_sun4v.c
@@ -16,7 +16,7 @@
 #include <linux/export.h>
 #include <linux/log2.h>
 #include <linux/of_device.h>
-#include <linux/iommu-common.h>
+#include <asm/iommu-common.h>
 
 #include <asm/iommu.h>
 #include <asm/irq.h>
diff --git a/lib/Makefile b/lib/Makefile
index ce20696d5a92..94203b5eecd4 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -147,7 +147,7 @@ obj-$(CONFIG_AUDIT_GENERIC) += audit.o
 obj-$(CONFIG_AUDIT_COMPAT_GENERIC) += compat_audit.o
 
 obj-$(CONFIG_SWIOTLB) += swiotlb.o
-obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o iommu-common.o
+obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o
 obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
 obj-$(CONFIG_NOTIFIER_ERROR_INJECTION) += notifier-error-inject.o
 obj-$(CONFIG_PM_NOTIFIER_ERROR_INJECT) += pm-notifier-error-inject.o
-- 
2.17.0


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[PATCH 02/12] iommu-helper: unexport iommu_area_alloc

[Christoph Hellwig]

This function is only used by built-in code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
 lib/iommu-helper.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c
index 23633c0fda4a..ded1703e7e64 100644
--- a/lib/iommu-helper.c
+++ b/lib/iommu-helper.c
@@ -3,7 +3,6 @@
  * IOMMU helper functions for the free area management
  */
 
-#include <linux/export.h>
 #include <linux/bitmap.h>
 #include <linux/bug.h>
 
@@ -38,4 +37,3 @@ unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
 	}
 	return -1;
 }
-EXPORT_SYMBOL(iommu_area_alloc);
-- 
2.17.0

[PATCH 03/12] iommu-helper: mark iommu_is_span_boundary as inline

[Christoph Hellwig]

This avoids selecting IOMMU_HELPER just for this function.  And we only
use it once or twice in normal builds so this often even is a size
reduction.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/alpha/Kconfig              |  3 ---
 arch/arm/Kconfig                |  3 ---
 arch/arm64/Kconfig              |  3 ---
 arch/ia64/Kconfig               |  3 ---
 arch/mips/cavium-octeon/Kconfig |  4 ----
 arch/mips/loongson64/Kconfig    |  4 ----
 arch/mips/netlogic/Kconfig      |  3 ---
 arch/powerpc/Kconfig            |  1 -
 arch/unicore32/mm/Kconfig       |  3 ---
 arch/x86/Kconfig                |  2 +-
 drivers/parisc/Kconfig          |  5 -----
 include/linux/iommu-helper.h    | 13 ++++++++++---
 lib/iommu-helper.c              | 12 +-----------
 13 files changed, 12 insertions(+), 47 deletions(-)

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index b2022885ced8..3ff735a722af 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -345,9 +345,6 @@ config PCI_DOMAINS
 config PCI_SYSCALL
 	def_bool PCI
 
-config IOMMU_HELPER
-	def_bool PCI
-
 config ALPHA_NONAME
 	bool
 	depends on ALPHA_BOOK1 || ALPHA_NONAME_CH
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a7f8e7f4b88f..2f79222c5c02 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1781,9 +1781,6 @@ config SECCOMP
 config SWIOTLB
 	def_bool y
 
-config IOMMU_HELPER
-	def_bool SWIOTLB
-
 config PARAVIRT
 	bool "Enable paravirtualization code"
 	help
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index eb2cf4938f6d..fbef5d3de83f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -252,9 +252,6 @@ config SMP
 config SWIOTLB
 	def_bool y
 
-config IOMMU_HELPER
-	def_bool SWIOTLB
-
 config KERNEL_MODE_NEON
 	def_bool y
 
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index bbe12a038d21..862c5160c09d 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -613,6 +613,3 @@ source "security/Kconfig"
 source "crypto/Kconfig"
 
 source "lib/Kconfig"
-
-config IOMMU_HELPER
-	def_bool (IA64_HP_ZX1 || IA64_HP_ZX1_SWIOTLB || IA64_GENERIC || SWIOTLB)
diff --git a/arch/mips/cavium-octeon/Kconfig b/arch/mips/cavium-octeon/Kconfig
index b5eee1a57d6c..647ed158ac98 100644
--- a/arch/mips/cavium-octeon/Kconfig
+++ b/arch/mips/cavium-octeon/Kconfig
@@ -67,16 +67,12 @@ config CAVIUM_OCTEON_LOCK_L2_MEMCPY
 	help
 	  Lock the kernel's implementation of memcpy() into L2.
 
-config IOMMU_HELPER
-	bool
-
 config NEED_SG_DMA_LENGTH
 	bool
 
 config SWIOTLB
 	def_bool y
 	select DMA_DIRECT_OPS
-	select IOMMU_HELPER
 	select NEED_SG_DMA_LENGTH
 
 config OCTEON_ILM
diff --git a/arch/mips/loongson64/Kconfig b/arch/mips/loongson64/Kconfig
index 72af0c183969..5efb2e63878e 100644
--- a/arch/mips/loongson64/Kconfig
+++ b/arch/mips/loongson64/Kconfig
@@ -130,9 +130,6 @@ config LOONGSON_UART_BASE
 	default y
 	depends on EARLY_PRINTK || SERIAL_8250
 
-config IOMMU_HELPER
-	bool
-
 config NEED_SG_DMA_LENGTH
 	bool
 
@@ -141,7 +138,6 @@ config SWIOTLB
 	default y
 	depends on CPU_LOONGSON3
 	select DMA_DIRECT_OPS
-	select IOMMU_HELPER
 	select NEED_SG_DMA_LENGTH
 	select NEED_DMA_MAP_STATE
 
diff --git a/arch/mips/netlogic/Kconfig b/arch/mips/netlogic/Kconfig
index 7fcfc7fe9f14..5c5ee0e05a17 100644
--- a/arch/mips/netlogic/Kconfig
+++ b/arch/mips/netlogic/Kconfig
@@ -83,9 +83,6 @@ endif
 config NLM_COMMON
 	bool
 
-config IOMMU_HELPER
-	bool
-
 config NEED_SG_DMA_LENGTH
 	bool
 
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c32a181a7cbb..43e3c8e4e7f4 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -484,7 +484,6 @@ config IOMMU_HELPER
 config SWIOTLB
 	bool "SWIOTLB support"
 	default n
-	select IOMMU_HELPER
 	---help---
 	  Support for IO bounce buffering for systems without an IOMMU.
 	  This allows us to DMA to the full physical address space on
diff --git a/arch/unicore32/mm/Kconfig b/arch/unicore32/mm/Kconfig
index e9154a59d561..3f105e00c432 100644
--- a/arch/unicore32/mm/Kconfig
+++ b/arch/unicore32/mm/Kconfig
@@ -44,9 +44,6 @@ config SWIOTLB
 	def_bool y
 	select DMA_DIRECT_OPS
 
-config IOMMU_HELPER
-	def_bool SWIOTLB
-
 config NEED_SG_DMA_LENGTH
 	def_bool SWIOTLB
 
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 00fcf81f2c56..cb2c7ecc1fea 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -931,7 +931,7 @@ config SWIOTLB
 
 config IOMMU_HELPER
 	def_bool y
-	depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
+	depends on CALGARY_IOMMU || GART_IOMMU
 
 config MAXSMP
 	bool "Enable Maximum number of SMP Processors and NUMA Nodes"
diff --git a/drivers/parisc/Kconfig b/drivers/parisc/Kconfig
index 3a102a84d637..5a48b5606110 100644
--- a/drivers/parisc/Kconfig
+++ b/drivers/parisc/Kconfig
@@ -103,11 +103,6 @@ config IOMMU_SBA
 	depends on PCI_LBA
 	default PCI_LBA
 
-config IOMMU_HELPER
-	bool
-	depends on IOMMU_SBA || IOMMU_CCIO
-	default y
-
 source "drivers/pcmcia/Kconfig"
 
 endmenu
diff --git a/include/linux/iommu-helper.h b/include/linux/iommu-helper.h
index cb9a9248c8c0..70d01edcbf8b 100644
--- a/include/linux/iommu-helper.h
+++ b/include/linux/iommu-helper.h
@@ -2,6 +2,7 @@
 #ifndef _LINUX_IOMMU_HELPER_H
 #define _LINUX_IOMMU_HELPER_H
 
+#include <linux/bug.h>
 #include <linux/kernel.h>
 
 static inline unsigned long iommu_device_max_index(unsigned long size,
@@ -14,9 +15,15 @@ static inline unsigned long iommu_device_max_index(unsigned long size,
 		return size;
 }
 
-extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
-				  unsigned long shift,
-				  unsigned long boundary_size);
+static inline int iommu_is_span_boundary(unsigned int index, unsigned int nr,
+		unsigned long shift, unsigned long boundary_size)
+{
+	BUG_ON(!is_power_of_2(boundary_size));
+
+	shift = (shift + index) & (boundary_size - 1);
+	return shift + nr > boundary_size;
+}
+
 extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
 				      unsigned long start, unsigned int nr,
 				      unsigned long shift,
diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c
index ded1703e7e64..92a9f243c0e2 100644
--- a/lib/iommu-helper.c
+++ b/lib/iommu-helper.c
@@ -4,17 +4,7 @@
  */
 
 #include <linux/bitmap.h>
-#include <linux/bug.h>
-
-int iommu_is_span_boundary(unsigned int index, unsigned int nr,
-			   unsigned long shift,
-			   unsigned long boundary_size)
-{
-	BUG_ON(!is_power_of_2(boundary_size));
-
-	shift = (shift + index) & (boundary_size - 1);
-	return shift + nr > boundary_size;
-}
+#include <linux/iommu-helper.h>
 
 unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
 			       unsigned long start, unsigned int nr,
-- 
2.17.0

[PATCH 04/12] iommu-helper: move the IOMMU_HELPER config symbol to lib/

[Christoph Hellwig]

This way we have one central definition of it, and user can select it as
needed.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
 arch/powerpc/Kconfig | 4 +---
 arch/s390/Kconfig    | 5 ++---
 arch/sparc/Kconfig   | 5 +----
 arch/x86/Kconfig     | 6 ++----
 lib/Kconfig          | 3 +++
 5 files changed, 9 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 43e3c8e4e7f4..7698cf89af9c 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -223,6 +223,7 @@ config PPC
 	select HAVE_SYSCALL_TRACEPOINTS
 	select HAVE_VIRT_CPU_ACCOUNTING
 	select HAVE_IRQ_TIME_ACCOUNTING
+	select IOMMU_HELPER			if PPC64
 	select IRQ_DOMAIN
 	select IRQ_FORCED_THREADING
 	select MODULES_USE_ELF_RELA
@@ -478,9 +479,6 @@ config MPROFILE_KERNEL
 	depends on PPC64 && CPU_LITTLE_ENDIAN
 	def_bool !DISABLE_MPROFILE_KERNEL
 
-config IOMMU_HELPER
-	def_bool PPC64
-
 config SWIOTLB
 	bool "SWIOTLB support"
 	default n
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 199ac3e4da1d..60c4ab854182 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -709,7 +709,9 @@ config QDIO
 menuconfig PCI
 	bool "PCI support"
 	select PCI_MSI
+	select IOMMU_HELPER
 	select IOMMU_SUPPORT
+
 	help
 	  Enable PCI support.
 
@@ -733,9 +735,6 @@ config PCI_DOMAINS
 config HAS_IOMEM
 	def_bool PCI
 
-config IOMMU_HELPER
-	def_bool PCI
-
 config NEED_SG_DMA_LENGTH
 	def_bool PCI
 
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 8767e45f1b2b..44e0f3cd7988 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -67,6 +67,7 @@ config SPARC64
 	select HAVE_SYSCALL_TRACEPOINTS
 	select HAVE_CONTEXT_TRACKING
 	select HAVE_DEBUG_KMEMLEAK
+	select IOMMU_HELPER
 	select SPARSE_IRQ
 	select RTC_DRV_CMOS
 	select RTC_DRV_BQ4802
@@ -106,10 +107,6 @@ config ARCH_DMA_ADDR_T_64BIT
 	bool
 	default y if ARCH_ATU
 
-config IOMMU_HELPER
-	bool
-	default y if SPARC64
-
 config STACKTRACE_SUPPORT
 	bool
 	default y if SPARC64
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index cb2c7ecc1fea..fe9713539166 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -871,6 +871,7 @@ config DMI
 
 config GART_IOMMU
 	bool "Old AMD GART IOMMU support"
+	select IOMMU_HELPER
 	select SWIOTLB
 	depends on X86_64 && PCI && AMD_NB
 	---help---
@@ -892,6 +893,7 @@ config GART_IOMMU
 
 config CALGARY_IOMMU
 	bool "IBM Calgary IOMMU support"
+	select IOMMU_HELPER
 	select SWIOTLB
 	depends on X86_64 && PCI
 	---help---
@@ -929,10 +931,6 @@ config SWIOTLB
 	  with more than 3 GB of memory.
 	  If unsure, say Y.
 
-config IOMMU_HELPER
-	def_bool y
-	depends on CALGARY_IOMMU || GART_IOMMU
-
 config MAXSMP
 	bool "Enable Maximum number of SMP Processors and NUMA Nodes"
 	depends on X86_64 && SMP && DEBUG_KERNEL
diff --git a/lib/Kconfig b/lib/Kconfig
index 5fe577673b98..2f6908577534 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -429,6 +429,9 @@ config SGL_ALLOC
 	bool
 	default n
 
+config IOMMU_HELPER
+	bool
+
 config DMA_DIRECT_OPS
 	bool
 	depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
-- 
2.17.0

[PATCH 05/12] scatterlist: move the NEED_SG_DMA_LENGTH config symbol to lib/Kconfig

[Christoph Hellwig]

This way we have one central definition of it, and user can select it as
needed.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
 arch/alpha/Kconfig              | 4 +---
 arch/arm/Kconfig                | 3 ---
 arch/arm64/Kconfig              | 4 +---
 arch/hexagon/Kconfig            | 4 +---
 arch/ia64/Kconfig               | 4 +---
 arch/mips/cavium-octeon/Kconfig | 3 ---
 arch/mips/loongson64/Kconfig    | 3 ---
 arch/mips/netlogic/Kconfig      | 3 ---
 arch/parisc/Kconfig             | 4 +---
 arch/powerpc/Kconfig            | 4 +---
 arch/s390/Kconfig               | 4 +---
 arch/sh/Kconfig                 | 5 ++---
 arch/sparc/Kconfig              | 4 +---
 arch/unicore32/mm/Kconfig       | 5 +----
 arch/x86/Kconfig                | 4 +---
 lib/Kconfig                     | 3 +++
 16 files changed, 15 insertions(+), 46 deletions(-)

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 3ff735a722af..8e6a67ecf069 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -10,6 +10,7 @@ config ALPHA
 	select HAVE_OPROFILE
 	select HAVE_PCSPKR_PLATFORM
 	select HAVE_PERF_EVENTS
+	select NEED_SG_DMA_LENGTH
 	select VIRT_TO_BUS
 	select GENERIC_IRQ_PROBE
 	select AUTO_IRQ_AFFINITY if SMP
@@ -70,9 +71,6 @@ config ARCH_DMA_ADDR_T_64BIT
 config NEED_DMA_MAP_STATE
        def_bool y
 
-config NEED_SG_DMA_LENGTH
-	def_bool y
-
 config GENERIC_ISA_DMA
 	bool
 	default y
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 2f79222c5c02..602c8320282f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -119,9 +119,6 @@ config ARM_HAS_SG_CHAIN
 	select ARCH_HAS_SG_CHAIN
 	bool
 
-config NEED_SG_DMA_LENGTH
-	bool
-
 config ARM_DMA_USE_IOMMU
 	bool
 	select ARM_HAS_SG_CHAIN
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index fbef5d3de83f..3b441c5587f1 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -133,6 +133,7 @@ config ARM64
 	select IRQ_FORCED_THREADING
 	select MODULES_USE_ELF_RELA
 	select MULTI_IRQ_HANDLER
+	select NEED_SG_DMA_LENGTH
 	select NO_BOOTMEM
 	select OF
 	select OF_EARLY_FLATTREE
@@ -243,9 +244,6 @@ config ARCH_DMA_ADDR_T_64BIT
 config NEED_DMA_MAP_STATE
 	def_bool y
 
-config NEED_SG_DMA_LENGTH
-	def_bool y
-
 config SMP
 	def_bool y
 
diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index 76d2f20d525e..37adb2003033 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -19,6 +19,7 @@ config HEXAGON
 	select GENERIC_IRQ_SHOW
 	select HAVE_ARCH_KGDB
 	select HAVE_ARCH_TRACEHOOK
+	select NEED_SG_DMA_LENGTH
 	select NO_IOPORT_MAP
 	select GENERIC_IOMAP
 	select GENERIC_SMP_IDLE_THREAD
@@ -63,9 +64,6 @@ config GENERIC_CSUM
 config GENERIC_IRQ_PROBE
 	def_bool y
 
-config NEED_SG_DMA_LENGTH
-	def_bool y
-
 config RWSEM_GENERIC_SPINLOCK
 	def_bool n
 
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 862c5160c09d..333917676f7f 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -54,6 +54,7 @@ config IA64
 	select MODULES_USE_ELF_RELA
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select HAVE_ARCH_AUDITSYSCALL
+	select NEED_SG_DMA_LENGTH
 	default y
 	help
 	  The Itanium Processor Family is Intel's 64-bit successor to
@@ -84,9 +85,6 @@ config ARCH_DMA_ADDR_T_64BIT
 config NEED_DMA_MAP_STATE
 	def_bool y
 
-config NEED_SG_DMA_LENGTH
-	def_bool y
-
 config SWIOTLB
        bool
 
diff --git a/arch/mips/cavium-octeon/Kconfig b/arch/mips/cavium-octeon/Kconfig
index 647ed158ac98..5d73041547a7 100644
--- a/arch/mips/cavium-octeon/Kconfig
+++ b/arch/mips/cavium-octeon/Kconfig
@@ -67,9 +67,6 @@ config CAVIUM_OCTEON_LOCK_L2_MEMCPY
 	help
 	  Lock the kernel's implementation of memcpy() into L2.
 
-config NEED_SG_DMA_LENGTH
-	bool
-
 config SWIOTLB
 	def_bool y
 	select DMA_DIRECT_OPS
diff --git a/arch/mips/loongson64/Kconfig b/arch/mips/loongson64/Kconfig
index 5efb2e63878e..641a1477031e 100644
--- a/arch/mips/loongson64/Kconfig
+++ b/arch/mips/loongson64/Kconfig
@@ -130,9 +130,6 @@ config LOONGSON_UART_BASE
 	default y
 	depends on EARLY_PRINTK || SERIAL_8250
 
-config NEED_SG_DMA_LENGTH
-	bool
-
 config SWIOTLB
 	bool "Soft IOMMU Support for All-Memory DMA"
 	default y
diff --git a/arch/mips/netlogic/Kconfig b/arch/mips/netlogic/Kconfig
index 5c5ee0e05a17..412351c5acc6 100644
--- a/arch/mips/netlogic/Kconfig
+++ b/arch/mips/netlogic/Kconfig
@@ -83,7 +83,4 @@ endif
 config NLM_COMMON
 	bool
 
-config NEED_SG_DMA_LENGTH
-	bool
-
 endif
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index fc5a574c3482..89caea87556e 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -51,6 +51,7 @@ config PARISC
 	select GENERIC_CLOCKEVENTS
 	select ARCH_NO_COHERENT_DMA_MMAP
 	select CPU_NO_EFFICIENT_FFS
+	select NEED_SG_DMA_LENGTH
 
 	help
 	  The PA-RISC microprocessor is designed by Hewlett-Packard and used
@@ -114,9 +115,6 @@ config STACKTRACE_SUPPORT
 config NEED_DMA_MAP_STATE
 	def_bool y
 
-config NEED_SG_DMA_LENGTH
-	def_bool y
-
 config ISA_DMA_API
 	bool
 
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 7698cf89af9c..cc9a616d8934 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -227,6 +227,7 @@ config PPC
 	select IRQ_DOMAIN
 	select IRQ_FORCED_THREADING
 	select MODULES_USE_ELF_RELA
+	select NEED_SG_DMA_LENGTH
 	select NO_BOOTMEM
 	select OF
 	select OF_EARLY_FLATTREE
@@ -910,9 +911,6 @@ config ZONE_DMA
 config NEED_DMA_MAP_STATE
 	def_bool (PPC64 || NOT_COHERENT_CACHE)
 
-config NEED_SG_DMA_LENGTH
-	def_bool y
-
 config GENERIC_ISA_DMA
 	bool
 	depends on ISA_DMA_API
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 60c4ab854182..f80c6b983159 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -711,6 +711,7 @@ menuconfig PCI
 	select PCI_MSI
 	select IOMMU_HELPER
 	select IOMMU_SUPPORT
+	select NEED_SG_DMA_LENGTH
 
 	help
 	  Enable PCI support.
@@ -735,9 +736,6 @@ config PCI_DOMAINS
 config HAS_IOMEM
 	def_bool PCI
 
-config NEED_SG_DMA_LENGTH
-	def_bool PCI
-
 config NEED_DMA_MAP_STATE
 	def_bool PCI
 
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 97fe29316476..e127e0cbe30f 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -50,6 +50,8 @@ config SUPERH
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_FUTEX_CMPXCHG if FUTEX
 	select HAVE_NMI
+	select NEED_SG_DMA_LENGTH
+
 	help
 	  The SuperH is a RISC processor targeted for use in embedded systems
 	  and consumer electronics; it was also used in the Sega Dreamcast
@@ -163,9 +165,6 @@ config DMA_NONCOHERENT
 config NEED_DMA_MAP_STATE
 	def_bool DMA_NONCOHERENT
 
-config NEED_SG_DMA_LENGTH
-	def_bool y
-
 config PGTABLE_LEVELS
 	default 3 if X2TLB
 	default 2
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 44e0f3cd7988..e79badc8a682 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -44,6 +44,7 @@ config SPARC
 	select ARCH_HAS_SG_CHAIN
 	select CPU_NO_EFFICIENT_FFS
 	select LOCKDEP_SMALL if LOCKDEP
+	select NEED_SG_DMA_LENGTH
 
 config SPARC32
 	def_bool !64BIT
@@ -146,9 +147,6 @@ config ZONE_DMA
 config NEED_DMA_MAP_STATE
 	def_bool y
 
-config NEED_SG_DMA_LENGTH
-	def_bool y
-
 config GENERIC_ISA_DMA
 	bool
 	default y if SPARC32
diff --git a/arch/unicore32/mm/Kconfig b/arch/unicore32/mm/Kconfig
index 3f105e00c432..1d9fed0ada71 100644
--- a/arch/unicore32/mm/Kconfig
+++ b/arch/unicore32/mm/Kconfig
@@ -43,7 +43,4 @@ config CPU_TLB_SINGLE_ENTRY_DISABLE
 config SWIOTLB
 	def_bool y
 	select DMA_DIRECT_OPS
-
-config NEED_SG_DMA_LENGTH
-	def_bool SWIOTLB
-
+	select NEED_SG_DMA_LENGTH
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index fe9713539166..ead3babe4e79 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -183,6 +183,7 @@ config X86
 	select HAVE_UNSTABLE_SCHED_CLOCK
 	select HAVE_USER_RETURN_NOTIFIER
 	select IRQ_FORCED_THREADING
+	select NEED_SG_DMA_LENGTH
 	select PCI_LOCKLESS_CONFIG
 	select PERF_EVENTS
 	select RTC_LIB
@@ -239,9 +240,6 @@ config NEED_DMA_MAP_STATE
 	def_bool y
 	depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG || SWIOTLB
 
-config NEED_SG_DMA_LENGTH
-	def_bool y
-
 config GENERIC_ISA_DMA
 	def_bool y
 	depends on ISA_DMA_API
diff --git a/lib/Kconfig b/lib/Kconfig
index 2f6908577534..aeb7fae16bc2 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -429,6 +429,9 @@ config SGL_ALLOC
 	bool
 	default n
 
+config NEED_SG_DMA_LENGTH
+	bool
+
 config IOMMU_HELPER
 	bool
 
-- 
2.17.0

[PATCH 06/12] dma-mapping: move the NEED_DMA_MAP_STATE config symbol to lib/Kconfig

[Christoph Hellwig]

This way we have one central definition of it, and user can select it as
needed.  Note that we now also always select it when CONFIG_DMA_API_DEBUG
is select, which fixes some incorrect checks in a few network drivers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
 arch/alpha/Kconfig          | 4 +---
 arch/arm/Kconfig            | 4 +---
 arch/arm64/Kconfig          | 4 +---
 arch/ia64/Kconfig           | 4 +---
 arch/mips/Kconfig           | 3 ---
 arch/parisc/Kconfig         | 4 +---
 arch/s390/Kconfig           | 4 +---
 arch/sh/Kconfig             | 4 +---
 arch/sparc/Kconfig          | 4 +---
 arch/unicore32/Kconfig      | 4 +---
 arch/x86/Kconfig            | 6 ++----
 drivers/iommu/Kconfig       | 1 +
 include/linux/dma-mapping.h | 2 +-
 lib/Kconfig                 | 3 +++
 lib/Kconfig.debug           | 1 +
 15 files changed, 17 insertions(+), 35 deletions(-)

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 8e6a67ecf069..1fd9645b0c67 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -10,6 +10,7 @@ config ALPHA
 	select HAVE_OPROFILE
 	select HAVE_PCSPKR_PLATFORM
 	select HAVE_PERF_EVENTS
+	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
 	select VIRT_TO_BUS
 	select GENERIC_IRQ_PROBE
@@ -68,9 +69,6 @@ config ZONE_DMA
 config ARCH_DMA_ADDR_T_64BIT
 	def_bool y
 
-config NEED_DMA_MAP_STATE
-       def_bool y
-
 config GENERIC_ISA_DMA
 	bool
 	default y
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 602c8320282f..aa1c187d756d 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -96,6 +96,7 @@ config ARM
 	select HAVE_VIRT_CPU_ACCOUNTING_GEN
 	select IRQ_FORCED_THREADING
 	select MODULES_USE_ELF_REL
+	select NEED_DMA_MAP_STATE
 	select NO_BOOTMEM
 	select OF_EARLY_FLATTREE if OF
 	select OF_RESERVED_MEM if OF
@@ -221,9 +222,6 @@ config ARCH_MAY_HAVE_PC_FDC
 config ZONE_DMA
 	bool
 
-config NEED_DMA_MAP_STATE
-       def_bool y
-
 config ARCH_SUPPORTS_UPROBES
 	def_bool y
 
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 3b441c5587f1..940adfb9a2bc 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -133,6 +133,7 @@ config ARM64
 	select IRQ_FORCED_THREADING
 	select MODULES_USE_ELF_RELA
 	select MULTI_IRQ_HANDLER
+	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
 	select NO_BOOTMEM
 	select OF
@@ -241,9 +242,6 @@ config HAVE_GENERIC_GUP
 config ARCH_DMA_ADDR_T_64BIT
 	def_bool y
 
-config NEED_DMA_MAP_STATE
-	def_bool y
-
 config SMP
 	def_bool y
 
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 333917676f7f..0e42731adaf1 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -54,6 +54,7 @@ config IA64
 	select MODULES_USE_ELF_RELA
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select HAVE_ARCH_AUDITSYSCALL
+	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
 	default y
 	help
@@ -82,9 +83,6 @@ config MMU
 config ARCH_DMA_ADDR_T_64BIT
 	def_bool y
 
-config NEED_DMA_MAP_STATE
-	def_bool y
-
 config SWIOTLB
        bool
 
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 225c95da23ce..47d72c64d687 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1122,9 +1122,6 @@ config DMA_NONCOHERENT
 	bool
 	select NEED_DMA_MAP_STATE
 
-config NEED_DMA_MAP_STATE
-	bool
-
 config SYS_HAS_EARLY_PRINTK
 	bool
 
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 89caea87556e..4d8f64d48597 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -51,6 +51,7 @@ config PARISC
 	select GENERIC_CLOCKEVENTS
 	select ARCH_NO_COHERENT_DMA_MMAP
 	select CPU_NO_EFFICIENT_FFS
+	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
 
 	help
@@ -112,9 +113,6 @@ config PM
 config STACKTRACE_SUPPORT
 	def_bool y
 
-config NEED_DMA_MAP_STATE
-	def_bool y
-
 config ISA_DMA_API
 	bool
 
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index f80c6b983159..89a007672f70 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -711,6 +711,7 @@ menuconfig PCI
 	select PCI_MSI
 	select IOMMU_HELPER
 	select IOMMU_SUPPORT
+	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
 
 	help
@@ -736,9 +737,6 @@ config PCI_DOMAINS
 config HAS_IOMEM
 	def_bool PCI
 
-config NEED_DMA_MAP_STATE
-	def_bool PCI
-
 config CHSC_SCH
 	def_tristate m
 	prompt "Support for CHSC subchannels"
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index e127e0cbe30f..9417f70e008e 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -50,6 +50,7 @@ config SUPERH
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_FUTEX_CMPXCHG if FUTEX
 	select HAVE_NMI
+	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
 
 	help
@@ -162,9 +163,6 @@ config DMA_COHERENT
 config DMA_NONCOHERENT
 	def_bool !DMA_COHERENT
 
-config NEED_DMA_MAP_STATE
-	def_bool DMA_NONCOHERENT
-
 config PGTABLE_LEVELS
 	default 3 if X2TLB
 	default 2
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index e79badc8a682..be770b511ddd 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -44,6 +44,7 @@ config SPARC
 	select ARCH_HAS_SG_CHAIN
 	select CPU_NO_EFFICIENT_FFS
 	select LOCKDEP_SMALL if LOCKDEP
+	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
 
 config SPARC32
@@ -144,9 +145,6 @@ config ZONE_DMA
 	bool
 	default y if SPARC32
 
-config NEED_DMA_MAP_STATE
-	def_bool y
-
 config GENERIC_ISA_DMA
 	bool
 	default y if SPARC32
diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig
index 462e59a7ae78..82195714d20b 100644
--- a/arch/unicore32/Kconfig
+++ b/arch/unicore32/Kconfig
@@ -19,6 +19,7 @@ config UNICORE32
 	select ARCH_WANT_FRAME_POINTERS
 	select GENERIC_IOMAP
 	select MODULES_USE_ELF_REL
+	select NEED_DMA_MAP_STATE
 	help
 	  UniCore-32 is 32-bit Instruction Set Architecture,
 	  including a series of low-power-consumption RISC chip
@@ -61,9 +62,6 @@ config ARCH_MAY_HAVE_PC_FDC
 config ZONE_DMA
 	def_bool y
 
-config NEED_DMA_MAP_STATE
-       def_bool y
-
 source "init/Kconfig"
 
 source "kernel/Kconfig.freezer"
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ead3babe4e79..a98a9b14fda2 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -28,6 +28,7 @@ config X86_64
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select HAVE_ARCH_SOFT_DIRTY
 	select MODULES_USE_ELF_RELA
+	select NEED_DMA_MAP_STATE
 	select X86_DEV_DMA_OPS
 	select ARCH_HAS_SYSCALL_WRAPPER
 
@@ -236,10 +237,6 @@ config ARCH_MMAP_RND_COMPAT_BITS_MAX
 config SBUS
 	bool
 
-config NEED_DMA_MAP_STATE
-	def_bool y
-	depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG || SWIOTLB
-
 config GENERIC_ISA_DMA
 	def_bool y
 	depends on ISA_DMA_API
@@ -922,6 +919,7 @@ config CALGARY_IOMMU_ENABLED_BY_DEFAULT
 # need this always selected by IOMMU for the VIA workaround
 config SWIOTLB
 	def_bool y if X86_64
+	select NEED_DMA_MAP_STATE
 	---help---
 	  Support for software bounce buffers used on x86-64 systems
 	  which don't have a hardware IOMMU. Using this PCI devices
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index df171cb85822..5b714a062fa7 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -146,6 +146,7 @@ config INTEL_IOMMU
 	select DMA_DIRECT_OPS
 	select IOMMU_API
 	select IOMMU_IOVA
+	select NEED_DMA_MAP_STATE
 	select DMAR_TABLE
 	help
 	  DMA remapping (DMAR) devices support enables independent address
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index f8ab1c0f589e..14269d25498b 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -839,7 +839,7 @@ static inline int dma_mmap_wc(struct device *dev,
 #define dma_mmap_writecombine dma_mmap_wc
 #endif
 
-#if defined(CONFIG_NEED_DMA_MAP_STATE) || defined(CONFIG_DMA_API_DEBUG)
+#ifdef CONFIG_NEED_DMA_MAP_STATE
 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
diff --git a/lib/Kconfig b/lib/Kconfig
index aeb7fae16bc2..ce9fa962d59b 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -432,6 +432,9 @@ config SGL_ALLOC
 config NEED_SG_DMA_LENGTH
 	bool
 
+config NEED_DMA_MAP_STATE
+	bool
+
 config IOMMU_HELPER
 	bool
 
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c40c7b734cd1..685ed2dd4384 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1635,6 +1635,7 @@ config PROVIDE_OHCI1394_DMA_INIT
 config DMA_API_DEBUG
 	bool "Enable debugging of DMA-API usage"
 	depends on HAVE_DMA_API_DEBUG
+	select NEED_DMA_MAP_STATE
 	help
 	  Enable this option to debug the use of the DMA API by device drivers.
 	  With this option you will be able to detect common bugs in device
-- 
2.17.0

[PATCH 07/12] arch: remove the ARCH_PHYS_ADDR_T_64BIT config symbol

[Christoph Hellwig]

Instead select the PHYS_ADDR_T_64BIT for 32-bit architectures that need a
64-bit phys_addr_t type directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arc/Kconfig                       |  4 +---
 arch/arm/kernel/setup.c                |  2 +-
 arch/arm/mm/Kconfig                    |  4 +---
 arch/arm64/Kconfig                     |  3 ---
 arch/mips/Kconfig                      | 15 ++++++---------
 arch/powerpc/Kconfig                   |  5 +----
 arch/powerpc/platforms/Kconfig.cputype |  1 +
 arch/riscv/Kconfig                     |  6 ++----
 arch/x86/Kconfig                       |  5 +----
 mm/Kconfig                             |  2 +-
 10 files changed, 15 insertions(+), 32 deletions(-)

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index d76bf4a83740..f94c61da682a 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -453,13 +453,11 @@ config ARC_HAS_PAE40
 	default n
 	depends on ISA_ARCV2
 	select HIGHMEM
+	select PHYS_ADDR_T_64BIT
 	help
 	  Enable access to physical memory beyond 4G, only supported on
 	  ARC cores with 40 bit Physical Addressing support
 
-config ARCH_PHYS_ADDR_T_64BIT
-	def_bool ARC_HAS_PAE40
-
 config ARCH_DMA_ADDR_T_64BIT
 	bool
 
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index fc40a2b40595..35ca494c028c 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -754,7 +754,7 @@ int __init arm_add_memory(u64 start, u64 size)
 	else
 		size -= aligned_start - start;
 
-#ifndef CONFIG_ARCH_PHYS_ADDR_T_64BIT
+#ifndef CONFIG_PHYS_ADDR_T_64BIT
 	if (aligned_start > ULONG_MAX) {
 		pr_crit("Ignoring memory at 0x%08llx outside 32-bit physical address space\n",
 			(long long)start);
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 7f14acf67caf..2f77c6344ef1 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -661,6 +661,7 @@ config ARM_LPAE
 	bool "Support for the Large Physical Address Extension"
 	depends on MMU && CPU_32v7 && !CPU_32v6 && !CPU_32v5 && \
 		!CPU_32v4 && !CPU_32v3
+	select PHYS_ADDR_T_64BIT
 	help
 	  Say Y if you have an ARMv7 processor supporting the LPAE page
 	  table format and you would like to access memory beyond the
@@ -673,9 +674,6 @@ config ARM_PV_FIXUP
 	def_bool y
 	depends on ARM_LPAE && ARM_PATCH_PHYS_VIRT && ARCH_KEYSTONE
 
-config ARCH_PHYS_ADDR_T_64BIT
-	def_bool ARM_LPAE
-
 config ARCH_DMA_ADDR_T_64BIT
 	bool
 
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 940adfb9a2bc..b6aa33e642cc 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -152,9 +152,6 @@ config ARM64
 config 64BIT
 	def_bool y
 
-config ARCH_PHYS_ADDR_T_64BIT
-	def_bool y
-
 config MMU
 	def_bool y
 
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 47d72c64d687..985388078872 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -132,7 +132,7 @@ config MIPS_GENERIC
 
 config MIPS_ALCHEMY
 	bool "Alchemy processor based machines"
-	select ARCH_PHYS_ADDR_T_64BIT
+	select PHYS_ADDR_T_64BIT
 	select CEVT_R4K
 	select CSRC_R4K
 	select IRQ_MIPS_CPU
@@ -890,7 +890,7 @@ 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 PHYS_ADDR_T_64BIT
 	select DMA_COHERENT
 	select SYS_SUPPORTS_64BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN
@@ -936,7 +936,7 @@ config NLM_XLR_BOARD
 	select SWAP_IO_SPACE
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_64BIT_KERNEL
-	select ARCH_PHYS_ADDR_T_64BIT
+	select PHYS_ADDR_T_64BIT
 	select SYS_SUPPORTS_BIG_ENDIAN
 	select SYS_SUPPORTS_HIGHMEM
 	select DMA_COHERENT
@@ -962,7 +962,7 @@ config NLM_XLP_BOARD
 	select HW_HAS_PCI
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_64BIT_KERNEL
-	select ARCH_PHYS_ADDR_T_64BIT
+	select PHYS_ADDR_T_64BIT
 	select GPIOLIB
 	select SYS_SUPPORTS_BIG_ENDIAN
 	select SYS_SUPPORTS_LITTLE_ENDIAN
@@ -1102,7 +1102,7 @@ config FW_CFE
 	bool
 
 config ARCH_DMA_ADDR_T_64BIT
-	def_bool (HIGHMEM && ARCH_PHYS_ADDR_T_64BIT) || 64BIT
+	def_bool (HIGHMEM && PHYS_ADDR_T_64BIT) || 64BIT
 
 config ARCH_SUPPORTS_UPROBES
 	bool
@@ -1767,7 +1767,7 @@ config CPU_MIPS32_R5_XPA
 	depends on SYS_SUPPORTS_HIGHMEM
 	select XPA
 	select HIGHMEM
-	select ARCH_PHYS_ADDR_T_64BIT
+	select PHYS_ADDR_T_64BIT
 	default n
 	help
 	  Choose this option if you want to enable the Extended Physical
@@ -2399,9 +2399,6 @@ config SB1_PASS_2_1_WORKAROUNDS
 	default y
 
 
-config ARCH_PHYS_ADDR_T_64BIT
-       bool
-
 choice
 	prompt "SmartMIPS or microMIPS ASE support"
 
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index cc9a616d8934..b3d091d65e05 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -13,11 +13,8 @@ config 64BIT
 	bool
 	default y if PPC64
 
-config ARCH_PHYS_ADDR_T_64BIT
-       def_bool PPC64 || PHYS_64BIT
-
 config ARCH_DMA_ADDR_T_64BIT
-	def_bool ARCH_PHYS_ADDR_T_64BIT
+	def_bool PHYS_ADDR_T_64BIT
 
 config MMU
 	bool
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 67d3125d0610..84b58abc08ee 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -222,6 +222,7 @@ config PTE_64BIT
 config PHYS_64BIT
 	bool 'Large physical address support' if E500 || PPC_86xx
 	depends on (44x || E500 || PPC_86xx) && !PPC_83xx && !PPC_82xx
+	select PHYS_ADDR_T_64BIT
 	---help---
 	  This option enables kernel support for larger than 32-bit physical
 	  addresses.  This feature may not be available on all cores.
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 23d8acca5c90..f52f86f43a4b 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -5,6 +5,8 @@
 
 config RISCV
 	def_bool y
+	# even on 32-bit, physical (and DMA) addresses are > 32-bits
+	select PHYS_ADDR_T_64BIT
 	select OF
 	select OF_EARLY_FLATTREE
 	select OF_IRQ
@@ -38,10 +40,6 @@ config RISCV
 config MMU
 	def_bool y
 
-# even on 32-bit, physical (and DMA) addresses are > 32-bits
-config ARCH_PHYS_ADDR_T_64BIT
-	def_bool y
-
 config ZONE_DMA32
 	bool
 	default y
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a98a9b14fda2..8fccdaf02bb0 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1448,6 +1448,7 @@ config HIGHMEM
 config X86_PAE
 	bool "PAE (Physical Address Extension) Support"
 	depends on X86_32 && !HIGHMEM4G
+	select PHYS_ADDR_T_64BIT
 	select SWIOTLB
 	---help---
 	  PAE is required for NX support, and furthermore enables
@@ -1475,10 +1476,6 @@ config X86_5LEVEL
 
 	  Say N if unsure.
 
-config ARCH_PHYS_ADDR_T_64BIT
-	def_bool y
-	depends on X86_64 || X86_PAE
-
 config ARCH_DMA_ADDR_T_64BIT
 	def_bool y
 	depends on X86_64 || HIGHMEM64G
diff --git a/mm/Kconfig b/mm/Kconfig
index d5004d82a1d6..a3f0005ac212 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -266,7 +266,7 @@ config ARCH_ENABLE_THP_MIGRATION
 	bool
 
 config PHYS_ADDR_T_64BIT
-	def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT
+	def_bool 64BIT
 
 config BOUNCE
 	bool "Enable bounce buffers"
-- 
2.17.0

[PATCH 08/12] arch: define the ARCH_DMA_ADDR_T_64BIT config symbol in lib/Kconfig

[Christoph Hellwig]

Define this symbol if the architecture either uses 64-bit pointers or the
PHYS_ADDR_T_64BIT is set.  This covers 95% of the old arch magic.  We only
need an additional select for Xen on ARM (why anyway?), and we now always
set ARCH_DMA_ADDR_T_64BIT on mips boards with 64-bit physical addressing
instead of only doing it when highmem is set.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/alpha/Kconfig             | 3 ---
 arch/arc/Kconfig               | 3 ---
 arch/arm/mach-axxia/Kconfig    | 1 -
 arch/arm/mach-bcm/Kconfig      | 1 -
 arch/arm/mach-exynos/Kconfig   | 1 -
 arch/arm/mach-highbank/Kconfig | 1 -
 arch/arm/mach-rockchip/Kconfig | 1 -
 arch/arm/mach-shmobile/Kconfig | 1 -
 arch/arm/mach-tegra/Kconfig    | 1 -
 arch/arm/mm/Kconfig            | 3 ---
 arch/arm64/Kconfig             | 3 ---
 arch/ia64/Kconfig              | 3 ---
 arch/mips/Kconfig              | 3 ---
 arch/powerpc/Kconfig           | 3 ---
 arch/riscv/Kconfig             | 3 ---
 arch/s390/Kconfig              | 3 ---
 arch/sparc/Kconfig             | 4 ----
 arch/x86/Kconfig               | 4 ----
 lib/Kconfig                    | 3 +++
 19 files changed, 3 insertions(+), 42 deletions(-)

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 1fd9645b0c67..aa7df1a36fd0 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -66,9 +66,6 @@ config ZONE_DMA
 	bool
 	default y
 
-config ARCH_DMA_ADDR_T_64BIT
-	def_bool y
-
 config GENERIC_ISA_DMA
 	bool
 	default y
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index f94c61da682a..7498aca4b887 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -458,9 +458,6 @@ config ARC_HAS_PAE40
 	  Enable access to physical memory beyond 4G, only supported on
 	  ARC cores with 40 bit Physical Addressing support
 
-config ARCH_DMA_ADDR_T_64BIT
-	bool
-
 config ARC_KVADDR_SIZE
 	int "Kernel Virtual Address Space size (MB)"
 	range 0 512
diff --git a/arch/arm/mach-axxia/Kconfig b/arch/arm/mach-axxia/Kconfig
index bb2ce1c63fd9..d3eae6037913 100644
--- a/arch/arm/mach-axxia/Kconfig
+++ b/arch/arm/mach-axxia/Kconfig
@@ -2,7 +2,6 @@
 config ARCH_AXXIA
 	bool "LSI Axxia platforms"
 	depends on ARCH_MULTI_V7 && ARM_LPAE
-	select ARCH_DMA_ADDR_T_64BIT
 	select ARM_AMBA
 	select ARM_GIC
 	select ARM_TIMER_SP804
diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index c2f3b0d216a4..c46a728df44e 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -211,7 +211,6 @@ config ARCH_BRCMSTB
 	select BRCMSTB_L2_IRQ
 	select BCM7120_L2_IRQ
 	select ARCH_HAS_HOLES_MEMORYMODEL
-	select ARCH_DMA_ADDR_T_64BIT if ARM_LPAE
 	select ZONE_DMA if ARM_LPAE
 	select SOC_BRCMSTB
 	select SOC_BUS
diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index 647c319f9f5f..2ca405816846 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -112,7 +112,6 @@ config SOC_EXYNOS5440
 	bool "SAMSUNG EXYNOS5440"
 	default y
 	depends on ARCH_EXYNOS5
-	select ARCH_DMA_ADDR_T_64BIT if ARM_LPAE
 	select HAVE_ARM_ARCH_TIMER
 	select AUTO_ZRELADDR
 	select PINCTRL_EXYNOS5440
diff --git a/arch/arm/mach-highbank/Kconfig b/arch/arm/mach-highbank/Kconfig
index 81110ec34226..5552968f07f8 100644
--- a/arch/arm/mach-highbank/Kconfig
+++ b/arch/arm/mach-highbank/Kconfig
@@ -1,7 +1,6 @@
 config ARCH_HIGHBANK
 	bool "Calxeda ECX-1000/2000 (Highbank/Midway)"
 	depends on ARCH_MULTI_V7
-	select ARCH_DMA_ADDR_T_64BIT if ARM_LPAE
 	select ARCH_HAS_HOLES_MEMORYMODEL
 	select ARCH_SUPPORTS_BIG_ENDIAN
 	select ARM_AMBA
diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index a4065966881a..fafd3d7f9f8c 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -3,7 +3,6 @@ config ARCH_ROCKCHIP
 	depends on ARCH_MULTI_V7
 	select PINCTRL
 	select PINCTRL_ROCKCHIP
-	select ARCH_DMA_ADDR_T_64BIT if ARM_LPAE
 	select ARCH_HAS_RESET_CONTROLLER
 	select ARM_AMBA
 	select ARM_GIC
diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig
index 280e7312a9e1..fe60cd09a5ca 100644
--- a/arch/arm/mach-shmobile/Kconfig
+++ b/arch/arm/mach-shmobile/Kconfig
@@ -29,7 +29,6 @@ config ARCH_RMOBILE
 menuconfig ARCH_RENESAS
 	bool "Renesas ARM SoCs"
 	depends on ARCH_MULTI_V7 && MMU
-	select ARCH_DMA_ADDR_T_64BIT if ARM_LPAE
 	select ARCH_SHMOBILE
 	select ARM_GIC
 	select GPIOLIB
diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index 1e0aeb47bac6..7f3b83e0d324 100644
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -15,6 +15,5 @@ menuconfig ARCH_TEGRA
 	select RESET_CONTROLLER
 	select SOC_BUS
 	select ZONE_DMA if ARM_LPAE
-	select ARCH_DMA_ADDR_T_64BIT if ARM_LPAE
 	help
 	  This enables support for NVIDIA Tegra based systems.
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 2f77c6344ef1..5a016bc80e26 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -674,9 +674,6 @@ config ARM_PV_FIXUP
 	def_bool y
 	depends on ARM_LPAE && ARM_PATCH_PHYS_VIRT && ARCH_KEYSTONE
 
-config ARCH_DMA_ADDR_T_64BIT
-	bool
-
 config ARM_THUMB
 	bool "Support Thumb user binaries" if !CPU_THUMBONLY && EXPERT
 	depends on CPU_THUMB_CAPABLE
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index b6aa33e642cc..4d924eb32e7f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -236,9 +236,6 @@ config ZONE_DMA32
 config HAVE_GENERIC_GUP
 	def_bool y
 
-config ARCH_DMA_ADDR_T_64BIT
-	def_bool y
-
 config SMP
 	def_bool y
 
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 0e42731adaf1..685d557eea48 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -80,9 +80,6 @@ config MMU
 	bool
 	default y
 
-config ARCH_DMA_ADDR_T_64BIT
-	def_bool y
-
 config SWIOTLB
        bool
 
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 985388078872..e10cc5c7be69 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1101,9 +1101,6 @@ config GPIO_TXX9
 config FW_CFE
 	bool
 
-config ARCH_DMA_ADDR_T_64BIT
-	def_bool (HIGHMEM && PHYS_ADDR_T_64BIT) || 64BIT
-
 config ARCH_SUPPORTS_UPROBES
 	bool
 
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index b3d091d65e05..a4b2ac7c3d2e 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -13,9 +13,6 @@ config 64BIT
 	bool
 	default y if PPC64
 
-config ARCH_DMA_ADDR_T_64BIT
-	def_bool PHYS_ADDR_T_64BIT
-
 config MMU
 	bool
 	default y
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index f52f86f43a4b..17212ba54ee3 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -44,9 +44,6 @@ config ZONE_DMA32
 	bool
 	default y
 
-config ARCH_DMA_ADDR_T_64BIT
-	def_bool y
-
 config PAGE_OFFSET
 	hex
 	default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 89a007672f70..b794a2ab6d15 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -35,9 +35,6 @@ config GENERIC_BUG
 config GENERIC_BUG_RELATIVE_POINTERS
 	def_bool y
 
-config ARCH_DMA_ADDR_T_64BIT
-	def_bool y
-
 config GENERIC_LOCKBREAK
 	def_bool y if SMP && PREEMPT
 
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index be770b511ddd..c1cfc17eb504 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -105,10 +105,6 @@ config ARCH_ATU
 	bool
 	default y if SPARC64
 
-config ARCH_DMA_ADDR_T_64BIT
-	bool
-	default y if ARCH_ATU
-
 config STACKTRACE_SUPPORT
 	bool
 	default y if SPARC64
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8fccdaf02bb0..07b031f99eb1 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1476,10 +1476,6 @@ config X86_5LEVEL
 
 	  Say N if unsure.
 
-config ARCH_DMA_ADDR_T_64BIT
-	def_bool y
-	depends on X86_64 || HIGHMEM64G
-
 config X86_DIRECT_GBPAGES
 	def_bool y
 	depends on X86_64 && !DEBUG_PAGEALLOC
diff --git a/lib/Kconfig b/lib/Kconfig
index ce9fa962d59b..1f12faf03819 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -435,6 +435,9 @@ config NEED_SG_DMA_LENGTH
 config NEED_DMA_MAP_STATE
 	bool
 
+config ARCH_DMA_ADDR_T_64BIT
+	def_bool 64BIT || PHYS_ADDR_T_64BIT
+
 config IOMMU_HELPER
 	bool
 
-- 
2.17.0

[PATCH 09/12] PCI: remove CONFIG_PCI_BUS_ADDR_T_64BIT

[Christoph Hellwig]

This symbol is now always identical to CONFIG_ARCH_DMA_ADDR_T_64BIT, so
remove it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/pci/Kconfig | 4 ----
 drivers/pci/bus.c   | 4 ++--
 include/linux/pci.h | 2 +-
 3 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 34b56a8f8480..29a487f31dae 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -5,10 +5,6 @@
 
 source "drivers/pci/pcie/Kconfig"
 
-config PCI_BUS_ADDR_T_64BIT
-	def_bool y if (ARCH_DMA_ADDR_T_64BIT || 64BIT)
-	depends on PCI
-
 config PCI_MSI
 	bool "Message Signaled Interrupts (MSI and MSI-X)"
 	depends on PCI
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index bc2ded4c451f..35b7fc87eac5 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -120,7 +120,7 @@ int devm_request_pci_bus_resources(struct device *dev,
 EXPORT_SYMBOL_GPL(devm_request_pci_bus_resources);
 
 static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
-#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
 static struct pci_bus_region pci_64_bit = {0,
 				(pci_bus_addr_t) 0xffffffffffffffffULL};
 static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL,
@@ -230,7 +230,7 @@ int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
 					  resource_size_t),
 		void *alignf_data)
 {
-#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
 	int rc;
 
 	if (res->flags & IORESOURCE_MEM_64) {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 73178a2fcee0..55371cb827ad 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -670,7 +670,7 @@ int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
 		  int reg, int len, u32 val);
 
-#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
 typedef u64 pci_bus_addr_t;
 #else
 typedef u32 pci_bus_addr_t;
-- 
2.17.0

[PATCH 10/12] arm: don't build swiotlb by default

[Christoph Hellwig]

swiotlb is only used as a library of helper for xen-swiotlb if Xen support
is enabled on arm, so don't build it by default.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arm/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index aa1c187d756d..90b81a3a28a7 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1774,7 +1774,7 @@ config SECCOMP
 	  defined by each seccomp mode.
 
 config SWIOTLB
-	def_bool y
+	bool
 
 config PARAVIRT
 	bool "Enable paravirtualization code"
@@ -1807,6 +1807,7 @@ config XEN
 	depends on MMU
 	select ARCH_DMA_ADDR_T_64BIT
 	select ARM_PSCI
+	select SWIOTLB
 	select SWIOTLB_XEN
 	select PARAVIRT
 	help
-- 
2.17.0

[PATCH 11/12] swiotlb: move the SWIOTLB config symbol to lib/Kconfig

[Christoph Hellwig]

This way we have one central definition of it, and user can select it as
needed.  Note that we also add a second ARCH_HAS_SWIOTLB symbol to
indicate the architecture supports swiotlb at all, so that we can still
make the usage optional for a few architectures that want this feature
to be user selectable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arm/Kconfig                |  4 +---
 arch/arm64/Kconfig              |  5 ++---
 arch/ia64/Kconfig               |  9 +--------
 arch/mips/Kconfig               |  3 +++
 arch/mips/cavium-octeon/Kconfig |  5 -----
 arch/mips/loongson64/Kconfig    |  8 --------
 arch/powerpc/Kconfig            |  9 ---------
 arch/unicore32/mm/Kconfig       |  5 -----
 arch/x86/Kconfig                | 14 +++-----------
 lib/Kconfig                     | 15 +++++++++++++++
 10 files changed, 25 insertions(+), 52 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 90b81a3a28a7..f91f69174630 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -106,6 +106,7 @@ config ARM
 	select REFCOUNT_FULL
 	select RTC_LIB
 	select SYS_SUPPORTS_APM_EMULATION
+	select ARCH_HAS_SWIOTLB
 	# Above selects are sorted alphabetically; please add new ones
 	# according to that.  Thanks.
 	help
@@ -1773,9 +1774,6 @@ config SECCOMP
 	  and the task is only allowed to execute a few safe syscalls
 	  defined by each seccomp mode.
 
-config SWIOTLB
-	bool
-
 config PARAVIRT
 	bool "Enable paravirtualization code"
 	help
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 4d924eb32e7f..056bc7365adf 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -21,6 +21,7 @@ config ARM64
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
 	select ARCH_HAS_STRICT_MODULE_RWX
+	select ARCH_HAS_SWIOTLB
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
 	select ARCH_INLINE_READ_LOCK if !PREEMPT
@@ -144,6 +145,7 @@ config ARM64
 	select POWER_SUPPLY
 	select REFCOUNT_FULL
 	select SPARSE_IRQ
+	select SWIOTLB
 	select SYSCTL_EXCEPTION_TRACE
 	select THREAD_INFO_IN_TASK
 	help
@@ -239,9 +241,6 @@ config HAVE_GENERIC_GUP
 config SMP
 	def_bool y
 
-config SWIOTLB
-	def_bool y
-
 config KERNEL_MODE_NEON
 	def_bool y
 
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 685d557eea48..d396230913e6 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -56,6 +56,7 @@ config IA64
 	select HAVE_ARCH_AUDITSYSCALL
 	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
+	select ARCH_HAS_SWIOTLB
 	default y
 	help
 	  The Itanium Processor Family is Intel's 64-bit successor to
@@ -80,9 +81,6 @@ config MMU
 	bool
 	default y
 
-config SWIOTLB
-       bool
-
 config STACKTRACE_SUPPORT
 	def_bool y
 
@@ -139,7 +137,6 @@ config IA64_GENERIC
 	bool "generic"
 	select NUMA
 	select ACPI_NUMA
-	select DMA_DIRECT_OPS
 	select SWIOTLB
 	select PCI_MSI
 	help
@@ -160,7 +157,6 @@ config IA64_GENERIC
 
 config IA64_DIG
 	bool "DIG-compliant"
-	select DMA_DIRECT_OPS
 	select SWIOTLB
 
 config IA64_DIG_VTD
@@ -176,7 +172,6 @@ config IA64_HP_ZX1
 
 config IA64_HP_ZX1_SWIOTLB
 	bool "HP-zx1/sx1000 with software I/O TLB"
-	select DMA_DIRECT_OPS
 	select SWIOTLB
 	help
 	  Build a kernel that runs on HP zx1 and sx1000 systems even when they
@@ -200,7 +195,6 @@ config IA64_SGI_UV
 	bool "SGI-UV"
 	select NUMA
 	select ACPI_NUMA
-	select DMA_DIRECT_OPS
 	select SWIOTLB
 	help
 	  Selecting this option will optimize the kernel for use on UV based
@@ -211,7 +205,6 @@ config IA64_SGI_UV
 
 config IA64_HP_SIM
 	bool "Ski-simulator"
-	select DMA_DIRECT_OPS
 	select SWIOTLB
 	depends on !PM
 
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index e10cc5c7be69..b6b4c1e154f8 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -912,6 +912,8 @@ config CAVIUM_OCTEON_SOC
 	select MIPS_NR_CPU_NR_MAP_1024
 	select BUILTIN_DTB
 	select MTD_COMPLEX_MAPPINGS
+	select ARCH_HAS_SWIOTLB
+	select SWIOTLB
 	select SYS_SUPPORTS_RELOCATABLE
 	help
 	  This option supports all of the Octeon reference boards from Cavium
@@ -1367,6 +1369,7 @@ config CPU_LOONGSON3
 	select MIPS_PGD_C0_CONTEXT
 	select MIPS_L1_CACHE_SHIFT_6
 	select GPIOLIB
+	select ARCH_HAS_SWIOTLB
 	help
 		The Loongson 3 processor implements the MIPS64R2 instruction
 		set with many extensions.
diff --git a/arch/mips/cavium-octeon/Kconfig b/arch/mips/cavium-octeon/Kconfig
index 5d73041547a7..4984e462be30 100644
--- a/arch/mips/cavium-octeon/Kconfig
+++ b/arch/mips/cavium-octeon/Kconfig
@@ -67,11 +67,6 @@ config CAVIUM_OCTEON_LOCK_L2_MEMCPY
 	help
 	  Lock the kernel's implementation of memcpy() into L2.
 
-config SWIOTLB
-	def_bool y
-	select DMA_DIRECT_OPS
-	select NEED_SG_DMA_LENGTH
-
 config OCTEON_ILM
 	tristate "Module to measure interrupt latency using Octeon CIU Timer"
 	help
diff --git a/arch/mips/loongson64/Kconfig b/arch/mips/loongson64/Kconfig
index 641a1477031e..c79e6a565572 100644
--- a/arch/mips/loongson64/Kconfig
+++ b/arch/mips/loongson64/Kconfig
@@ -130,14 +130,6 @@ config LOONGSON_UART_BASE
 	default y
 	depends on EARLY_PRINTK || SERIAL_8250
 
-config SWIOTLB
-	bool "Soft IOMMU Support for All-Memory DMA"
-	default y
-	depends on CPU_LOONGSON3
-	select DMA_DIRECT_OPS
-	select NEED_SG_DMA_LENGTH
-	select NEED_DMA_MAP_STATE
-
 config PHYS48_TO_HT40
 	bool
 	default y if CPU_LOONGSON3
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a4b2ac7c3d2e..1887f8f86a77 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -474,15 +474,6 @@ config MPROFILE_KERNEL
 	depends on PPC64 && CPU_LITTLE_ENDIAN
 	def_bool !DISABLE_MPROFILE_KERNEL
 
-config SWIOTLB
-	bool "SWIOTLB support"
-	default n
-	---help---
-	  Support for IO bounce buffering for systems without an IOMMU.
-	  This allows us to DMA to the full physical address space on
-	  platforms where the size of a physical address is larger
-	  than the bus address.  Not all platforms support this.
-
 config HOTPLUG_CPU
 	bool "Support for enabling/disabling CPUs"
 	depends on SMP && (PPC_PSERIES || \
diff --git a/arch/unicore32/mm/Kconfig b/arch/unicore32/mm/Kconfig
index 1d9fed0ada71..82759b6aba67 100644
--- a/arch/unicore32/mm/Kconfig
+++ b/arch/unicore32/mm/Kconfig
@@ -39,8 +39,3 @@ config CPU_TLB_SINGLE_ENTRY_DISABLE
 	default y
 	help
 	  Say Y here to disable the TLB single entry operations.
-
-config SWIOTLB
-	def_bool y
-	select DMA_DIRECT_OPS
-	select NEED_SG_DMA_LENGTH
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 07b031f99eb1..7a5fec800992 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -24,6 +24,7 @@ config X86_64
 	depends on 64BIT
 	# Options that are inherently 64-bit kernel only:
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
+	select ARCH_HAS_SWIOTLB
 	select ARCH_SUPPORTS_INT128
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select HAVE_ARCH_SOFT_DIRTY
@@ -677,6 +678,7 @@ config STA2X11
 	bool "STA2X11 Companion Chip Support"
 	depends on X86_32_NON_STANDARD && PCI
 	select ARCH_HAS_PHYS_TO_DMA
+	select ARCH_HAS_SWIOTLB
 	select X86_DEV_DMA_OPS
 	select X86_DMA_REMAP
 	select SWIOTLB
@@ -916,17 +918,6 @@ config CALGARY_IOMMU_ENABLED_BY_DEFAULT
 	  Calgary anyway, pass 'iommu=calgary' on the kernel command line.
 	  If unsure, say Y.
 
-# need this always selected by IOMMU for the VIA workaround
-config SWIOTLB
-	def_bool y if X86_64
-	select NEED_DMA_MAP_STATE
-	---help---
-	  Support for software bounce buffers used on x86-64 systems
-	  which don't have a hardware IOMMU. Using this PCI devices
-	  which can only access 32-bits of memory can be used on systems
-	  with more than 3 GB of memory.
-	  If unsure, say Y.
-
 config MAXSMP
 	bool "Enable Maximum number of SMP Processors and NUMA Nodes"
 	depends on X86_64 && SMP && DEBUG_KERNEL
@@ -1448,6 +1439,7 @@ config HIGHMEM
 config X86_PAE
 	bool "PAE (Physical Address Extension) Support"
 	depends on X86_32 && !HIGHMEM4G
+	select ARCH_HAS_SWIOTLB
 	select PHYS_ADDR_T_64BIT
 	select SWIOTLB
 	---help---
diff --git a/lib/Kconfig b/lib/Kconfig
index 1f12faf03819..01a37920949c 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -451,6 +451,21 @@ config DMA_VIRT_OPS
 	depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
 	default n
 
+config ARCH_HAS_SWIOTLB
+	bool
+
+config SWIOTLB
+	bool "SWIOTLB support"
+	default ARCH_HAS_SWIOTLB
+	select DMA_DIRECT_OPS
+	select NEED_DMA_MAP_STATE
+	select NEED_SG_DMA_LENGTH
+	---help---
+	  Support for IO bounce buffering for systems without an IOMMU.
+	  This allows us to DMA to the full physical address space on
+	  platforms where the size of a physical address is larger
+	  than the bus address.  If unsure, say Y.
+
 config CHECK_SIGNATURE
 	bool
 
-- 
2.17.0

[PATCH 12/12] swiotlb: remove the CONFIG_DMA_DIRECT_OPS ifdefs

[Christoph Hellwig]

swiotlb now selects the DMA_DIRECT_OPS config symbol, so this will
always be true.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 lib/swiotlb.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index fece57566d45..6954f7ad200a 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -692,7 +692,6 @@ void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
 	}
 }
 
-#ifdef CONFIG_DMA_DIRECT_OPS
 static inline bool dma_coherent_ok(struct device *dev, dma_addr_t addr,
 		size_t size)
 {
@@ -764,7 +763,6 @@ static bool swiotlb_free_buffer(struct device *dev, size_t size,
 				 DMA_ATTR_SKIP_CPU_SYNC);
 	return true;
 }
-#endif
 
 static void
 swiotlb_full(struct device *dev, size_t size, enum dma_data_direction dir,
@@ -1045,7 +1043,6 @@ swiotlb_dma_supported(struct device *hwdev, u64 mask)
 	return __phys_to_dma(hwdev, io_tlb_end - 1) <= mask;
 }
 
-#ifdef CONFIG_DMA_DIRECT_OPS
 void *swiotlb_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
 		gfp_t gfp, unsigned long attrs)
 {
@@ -1089,4 +1086,3 @@ const struct dma_map_ops swiotlb_dma_ops = {
 	.unmap_page		= swiotlb_unmap_page,
 	.dma_supported		= dma_direct_supported,
 };
-#endif /* CONFIG_DMA_DIRECT_OPS */
-- 
2.17.0

Re: [PATCH 10/12] arm: don't build swiotlb by default

[Konrad Rzeszutek Wilk]

On Mon, Apr 23, 2018 at 07:04:17PM +0200, Christoph Hellwig wrote:
> swiotlb is only used as a library of helper for xen-swiotlb if Xen support
> is enabled on arm, so don't build it by default.
> 

CCing Stefano
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  arch/arm/Kconfig | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index aa1c187d756d..90b81a3a28a7 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1774,7 +1774,7 @@ config SECCOMP
>  	  defined by each seccomp mode.
>  
>  config SWIOTLB
> -	def_bool y
> +	bool
>  
>  config PARAVIRT
>  	bool "Enable paravirtualization code"
> @@ -1807,6 +1807,7 @@ config XEN
>  	depends on MMU
>  	select ARCH_DMA_ADDR_T_64BIT
>  	select ARM_PSCI
> +	select SWIOTLB
>  	select SWIOTLB_XEN
>  	select PARAVIRT
>  	help
> -- 
> 2.17.0
> 

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Re: [PATCH 11/12] swiotlb: move the SWIOTLB config symbol to lib/Kconfig

[Konrad Rzeszutek Wilk]

On Mon, Apr 23, 2018 at 07:04:18PM +0200, Christoph Hellwig wrote:
> This way we have one central definition of it, and user can select it as
> needed.  Note that we also add a second ARCH_HAS_SWIOTLB symbol to
> indicate the architecture supports swiotlb at all, so that we can still
> make the usage optional for a few architectures that want this feature
> to be user selectable.

If I follow this select business this will enable it on ARM and x86 by default.

As such:
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Thank you!
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  arch/arm/Kconfig                |  4 +---
>  arch/arm64/Kconfig              |  5 ++---
>  arch/ia64/Kconfig               |  9 +--------
>  arch/mips/Kconfig               |  3 +++
>  arch/mips/cavium-octeon/Kconfig |  5 -----
>  arch/mips/loongson64/Kconfig    |  8 --------
>  arch/powerpc/Kconfig            |  9 ---------
>  arch/unicore32/mm/Kconfig       |  5 -----
>  arch/x86/Kconfig                | 14 +++-----------
>  lib/Kconfig                     | 15 +++++++++++++++
>  10 files changed, 25 insertions(+), 52 deletions(-)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 90b81a3a28a7..f91f69174630 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -106,6 +106,7 @@ config ARM
>  	select REFCOUNT_FULL
>  	select RTC_LIB
>  	select SYS_SUPPORTS_APM_EMULATION
> +	select ARCH_HAS_SWIOTLB
>  	# Above selects are sorted alphabetically; please add new ones
>  	# according to that.  Thanks.
>  	help
> @@ -1773,9 +1774,6 @@ config SECCOMP
>  	  and the task is only allowed to execute a few safe syscalls
>  	  defined by each seccomp mode.
>  
> -config SWIOTLB
> -	bool
> -
>  config PARAVIRT
>  	bool "Enable paravirtualization code"
>  	help
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 4d924eb32e7f..056bc7365adf 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -21,6 +21,7 @@ config ARM64
>  	select ARCH_HAS_SG_CHAIN
>  	select ARCH_HAS_STRICT_KERNEL_RWX
>  	select ARCH_HAS_STRICT_MODULE_RWX
> +	select ARCH_HAS_SWIOTLB
>  	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
>  	select ARCH_HAVE_NMI_SAFE_CMPXCHG
>  	select ARCH_INLINE_READ_LOCK if !PREEMPT
> @@ -144,6 +145,7 @@ config ARM64
>  	select POWER_SUPPLY
>  	select REFCOUNT_FULL
>  	select SPARSE_IRQ
> +	select SWIOTLB
>  	select SYSCTL_EXCEPTION_TRACE
>  	select THREAD_INFO_IN_TASK
>  	help
> @@ -239,9 +241,6 @@ config HAVE_GENERIC_GUP
>  config SMP
>  	def_bool y
>  
> -config SWIOTLB
> -	def_bool y
> -
>  config KERNEL_MODE_NEON
>  	def_bool y
>  
> diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
> index 685d557eea48..d396230913e6 100644
> --- a/arch/ia64/Kconfig
> +++ b/arch/ia64/Kconfig
> @@ -56,6 +56,7 @@ config IA64
>  	select HAVE_ARCH_AUDITSYSCALL
>  	select NEED_DMA_MAP_STATE
>  	select NEED_SG_DMA_LENGTH
> +	select ARCH_HAS_SWIOTLB
>  	default y
>  	help
>  	  The Itanium Processor Family is Intel's 64-bit successor to
> @@ -80,9 +81,6 @@ config MMU
>  	bool
>  	default y
>  
> -config SWIOTLB
> -       bool
> -
>  config STACKTRACE_SUPPORT
>  	def_bool y
>  
> @@ -139,7 +137,6 @@ config IA64_GENERIC
>  	bool "generic"
>  	select NUMA
>  	select ACPI_NUMA
> -	select DMA_DIRECT_OPS
>  	select SWIOTLB
>  	select PCI_MSI
>  	help
> @@ -160,7 +157,6 @@ config IA64_GENERIC
>  
>  config IA64_DIG
>  	bool "DIG-compliant"
> -	select DMA_DIRECT_OPS
>  	select SWIOTLB
>  
>  config IA64_DIG_VTD
> @@ -176,7 +172,6 @@ config IA64_HP_ZX1
>  
>  config IA64_HP_ZX1_SWIOTLB
>  	bool "HP-zx1/sx1000 with software I/O TLB"
> -	select DMA_DIRECT_OPS
>  	select SWIOTLB
>  	help
>  	  Build a kernel that runs on HP zx1 and sx1000 systems even when they
> @@ -200,7 +195,6 @@ config IA64_SGI_UV
>  	bool "SGI-UV"
>  	select NUMA
>  	select ACPI_NUMA
> -	select DMA_DIRECT_OPS
>  	select SWIOTLB
>  	help
>  	  Selecting this option will optimize the kernel for use on UV based
> @@ -211,7 +205,6 @@ config IA64_SGI_UV
>  
>  config IA64_HP_SIM
>  	bool "Ski-simulator"
> -	select DMA_DIRECT_OPS
>  	select SWIOTLB
>  	depends on !PM
>  
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index e10cc5c7be69..b6b4c1e154f8 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -912,6 +912,8 @@ config CAVIUM_OCTEON_SOC
>  	select MIPS_NR_CPU_NR_MAP_1024
>  	select BUILTIN_DTB
>  	select MTD_COMPLEX_MAPPINGS
> +	select ARCH_HAS_SWIOTLB
> +	select SWIOTLB
>  	select SYS_SUPPORTS_RELOCATABLE
>  	help
>  	  This option supports all of the Octeon reference boards from Cavium
> @@ -1367,6 +1369,7 @@ config CPU_LOONGSON3
>  	select MIPS_PGD_C0_CONTEXT
>  	select MIPS_L1_CACHE_SHIFT_6
>  	select GPIOLIB
> +	select ARCH_HAS_SWIOTLB
>  	help
>  		The Loongson 3 processor implements the MIPS64R2 instruction
>  		set with many extensions.
> diff --git a/arch/mips/cavium-octeon/Kconfig b/arch/mips/cavium-octeon/Kconfig
> index 5d73041547a7..4984e462be30 100644
> --- a/arch/mips/cavium-octeon/Kconfig
> +++ b/arch/mips/cavium-octeon/Kconfig
> @@ -67,11 +67,6 @@ config CAVIUM_OCTEON_LOCK_L2_MEMCPY
>  	help
>  	  Lock the kernel's implementation of memcpy() into L2.
>  
> -config SWIOTLB
> -	def_bool y
> -	select DMA_DIRECT_OPS
> -	select NEED_SG_DMA_LENGTH
> -
>  config OCTEON_ILM
>  	tristate "Module to measure interrupt latency using Octeon CIU Timer"
>  	help
> diff --git a/arch/mips/loongson64/Kconfig b/arch/mips/loongson64/Kconfig
> index 641a1477031e..c79e6a565572 100644
> --- a/arch/mips/loongson64/Kconfig
> +++ b/arch/mips/loongson64/Kconfig
> @@ -130,14 +130,6 @@ config LOONGSON_UART_BASE
>  	default y
>  	depends on EARLY_PRINTK || SERIAL_8250
>  
> -config SWIOTLB
> -	bool "Soft IOMMU Support for All-Memory DMA"
> -	default y
> -	depends on CPU_LOONGSON3
> -	select DMA_DIRECT_OPS
> -	select NEED_SG_DMA_LENGTH
> -	select NEED_DMA_MAP_STATE
> -
>  config PHYS48_TO_HT40
>  	bool
>  	default y if CPU_LOONGSON3
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index a4b2ac7c3d2e..1887f8f86a77 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -474,15 +474,6 @@ config MPROFILE_KERNEL
>  	depends on PPC64 && CPU_LITTLE_ENDIAN
>  	def_bool !DISABLE_MPROFILE_KERNEL
>  
> -config SWIOTLB
> -	bool "SWIOTLB support"
> -	default n
> -	---help---
> -	  Support for IO bounce buffering for systems without an IOMMU.
> -	  This allows us to DMA to the full physical address space on
> -	  platforms where the size of a physical address is larger
> -	  than the bus address.  Not all platforms support this.
> -
>  config HOTPLUG_CPU
>  	bool "Support for enabling/disabling CPUs"
>  	depends on SMP && (PPC_PSERIES || \
> diff --git a/arch/unicore32/mm/Kconfig b/arch/unicore32/mm/Kconfig
> index 1d9fed0ada71..82759b6aba67 100644
> --- a/arch/unicore32/mm/Kconfig
> +++ b/arch/unicore32/mm/Kconfig
> @@ -39,8 +39,3 @@ config CPU_TLB_SINGLE_ENTRY_DISABLE
>  	default y
>  	help
>  	  Say Y here to disable the TLB single entry operations.
> -
> -config SWIOTLB
> -	def_bool y
> -	select DMA_DIRECT_OPS
> -	select NEED_SG_DMA_LENGTH
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 07b031f99eb1..7a5fec800992 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -24,6 +24,7 @@ config X86_64
>  	depends on 64BIT
>  	# Options that are inherently 64-bit kernel only:
>  	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
> +	select ARCH_HAS_SWIOTLB
>  	select ARCH_SUPPORTS_INT128
>  	select ARCH_USE_CMPXCHG_LOCKREF
>  	select HAVE_ARCH_SOFT_DIRTY
> @@ -677,6 +678,7 @@ config STA2X11
>  	bool "STA2X11 Companion Chip Support"
>  	depends on X86_32_NON_STANDARD && PCI
>  	select ARCH_HAS_PHYS_TO_DMA
> +	select ARCH_HAS_SWIOTLB
>  	select X86_DEV_DMA_OPS
>  	select X86_DMA_REMAP
>  	select SWIOTLB
> @@ -916,17 +918,6 @@ config CALGARY_IOMMU_ENABLED_BY_DEFAULT
>  	  Calgary anyway, pass 'iommu=calgary' on the kernel command line.
>  	  If unsure, say Y.
>  
> -# need this always selected by IOMMU for the VIA workaround
> -config SWIOTLB
> -	def_bool y if X86_64
> -	select NEED_DMA_MAP_STATE
> -	---help---
> -	  Support for software bounce buffers used on x86-64 systems
> -	  which don't have a hardware IOMMU. Using this PCI devices
> -	  which can only access 32-bits of memory can be used on systems
> -	  with more than 3 GB of memory.
> -	  If unsure, say Y.
> -
>  config MAXSMP
>  	bool "Enable Maximum number of SMP Processors and NUMA Nodes"
>  	depends on X86_64 && SMP && DEBUG_KERNEL
> @@ -1448,6 +1439,7 @@ config HIGHMEM
>  config X86_PAE
>  	bool "PAE (Physical Address Extension) Support"
>  	depends on X86_32 && !HIGHMEM4G
> +	select ARCH_HAS_SWIOTLB
>  	select PHYS_ADDR_T_64BIT
>  	select SWIOTLB
>  	---help---
> diff --git a/lib/Kconfig b/lib/Kconfig
> index 1f12faf03819..01a37920949c 100644
> --- a/lib/Kconfig
> +++ b/lib/Kconfig
> @@ -451,6 +451,21 @@ config DMA_VIRT_OPS
>  	depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
>  	default n
>  
> +config ARCH_HAS_SWIOTLB
> +	bool
> +
> +config SWIOTLB
> +	bool "SWIOTLB support"
> +	default ARCH_HAS_SWIOTLB
> +	select DMA_DIRECT_OPS
> +	select NEED_DMA_MAP_STATE
> +	select NEED_SG_DMA_LENGTH
> +	---help---
> +	  Support for IO bounce buffering for systems without an IOMMU.
> +	  This allows us to DMA to the full physical address space on
> +	  platforms where the size of a physical address is larger
> +	  than the bus address.  If unsure, say Y.
> +
>  config CHECK_SIGNATURE
>  	bool
>  
> -- 
> 2.17.0
> 

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Re: [PATCH 11/12] swiotlb: move the SWIOTLB config symbol to lib/Kconfig

[Russell King - ARM Linux]

On Mon, Apr 23, 2018 at 07:04:18PM +0200, Christoph Hellwig wrote:
> This way we have one central definition of it, and user can select it as
> needed.  Note that we also add a second ARCH_HAS_SWIOTLB symbol to
> indicate the architecture supports swiotlb at all, so that we can still
> make the usage optional for a few architectures that want this feature
> to be user selectable.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Hmm, this looks like we end up with NEED_SG_DMA_LENGTH=y on ARM by
default, which probably isn't a good idea - ARM pre-dates the dma_length
parameter in scatterlists, and I don't think all code is guaranteed to
do the right thing if this is enabled.

For example, arch/arm/mach-rpc/dma.c doesn't use the dma_length
member of struct scatterlist.

-- 
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Re: [PATCH 11/12] swiotlb: move the SWIOTLB config symbol to lib/Kconfig

[Christoph Hellwig]

On Tue, Apr 24, 2018 at 12:52:05AM +0100, Russell King - ARM Linux wrote:
> On Mon, Apr 23, 2018 at 07:04:18PM +0200, Christoph Hellwig wrote:
> > This way we have one central definition of it, and user can select it as
> > needed.  Note that we also add a second ARCH_HAS_SWIOTLB symbol to
> > indicate the architecture supports swiotlb at all, so that we can still
> > make the usage optional for a few architectures that want this feature
> > to be user selectable.
> > 
> > Signed-off-by: Christoph Hellwig <hch@lst.de>
> 
> Hmm, this looks like we end up with NEED_SG_DMA_LENGTH=y on ARM by
> default, which probably isn't a good idea - ARM pre-dates the dma_length
> parameter in scatterlists, and I don't think all code is guaranteed to
> do the right thing if this is enabled.

We shouldn't end up with NEED_SG_DMA_LENGTH=y on ARM by default.
It is only select by ARM_DMA_USE_IOMMU before the patch, and it will
now also be selected by SWIOTLB, which for arm is never used or seleted
directly by anything but xen-swiotlb.

Then again looking at the series there shouldn't be any need to
even select NEED_SG_DMA_LENGTH for swiotlb, as we'll never merge segments,
so I'll fix that up.

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Re: [PATCH 11/12] swiotlb: move the SWIOTLB config symbol to lib/Kconfig

[Russell King - ARM Linux]

On Tue, Apr 24, 2018 at 08:55:49AM +0200, Christoph Hellwig wrote:
> On Tue, Apr 24, 2018 at 12:52:05AM +0100, Russell King - ARM Linux wrote:
> > On Mon, Apr 23, 2018 at 07:04:18PM +0200, Christoph Hellwig wrote:
> > > This way we have one central definition of it, and user can select it as
> > > needed.  Note that we also add a second ARCH_HAS_SWIOTLB symbol to
> > > indicate the architecture supports swiotlb at all, so that we can still
> > > make the usage optional for a few architectures that want this feature
> > > to be user selectable.
> > > 
> > > Signed-off-by: Christoph Hellwig <hch@lst.de>
> > 
> > Hmm, this looks like we end up with NEED_SG_DMA_LENGTH=y on ARM by
> > default, which probably isn't a good idea - ARM pre-dates the dma_length
> > parameter in scatterlists, and I don't think all code is guaranteed to
> > do the right thing if this is enabled.
> 
> We shouldn't end up with NEED_SG_DMA_LENGTH=y on ARM by default.

Your patch as sent would end up with:

ARM selects ARCH_HAS_SWIOTLB
SWIOTLB is defaulted to ARCH_HAS_SWIOTLB
SWIOTLB selects NEED_SG_DMA_LENGTH

due to:

@@ -106,6 +106,7 @@ config ARM
        select REFCOUNT_FULL
        select RTC_LIB
        select SYS_SUPPORTS_APM_EMULATION
+       select ARCH_HAS_SWIOTLB

and:

+config SWIOTLB
+       bool "SWIOTLB support"
+       default ARCH_HAS_SWIOTLB
+       select NEED_SG_DMA_LENGTH

Therefore, the default state for SWIOTLB and hence NEED_SG_DMA_LENGTH
becomes 'y' on ARM, and any defconfig file that does not mention SWIOTLB
explicitly ends up with both these enabled.

> It is only select by ARM_DMA_USE_IOMMU before the patch, and it will
> now also be selected by SWIOTLB, which for arm is never used or seleted
> directly by anything but xen-swiotlb.

See above.

> Then again looking at the series there shouldn't be any need to
> even select NEED_SG_DMA_LENGTH for swiotlb, as we'll never merge segments,
> so I'll fix that up.

That would help to avoid any regressions along the lines I've spotted
by review.

It does look a bit weird though - patch 10 arranged stuff so that we
didn't end up with SWIOTLB always enabled, but this patch reintroduces
that with the allowance that the user can disable if so desired.

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Re: [PATCH 11/12] swiotlb: move the SWIOTLB config symbol to lib/Kconfig

[Christoph Hellwig]

On Tue, Apr 24, 2018 at 08:47:27AM +0100, Russell King - ARM Linux wrote:
> Therefore, the default state for SWIOTLB and hence NEED_SG_DMA_LENGTH
> becomes 'y' on ARM, and any defconfig file that does not mention SWIOTLB
> explicitly ends up with both these enabled.

Indeed, sorry.

> It does look a bit weird though - patch 10 arranged stuff so that we
> didn't end up with SWIOTLB always enabled, but this patch reintroduces
> that with the allowance that the user can disable if so desired.

I am not very happy with that patch, but I have a hard time coming
up with something saner.

Bascially x86_64 and mips/loongson default to SWIOTLB=y but allow to
deselect it, powerpc has it optional without any real dependency
and defaults to n and everyone just selects it otherwise.

I suspect the right thing is to just have it always one for x86_64
and loongson and have a ppc-specific option to enable it on powerpc
so that we can always use select statements.  I'll do that for the
next round.

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Re: [PATCH 11/12] swiotlb: move the SWIOTLB config symbol to lib/Kconfig

[Anshuman Khandual]

On 04/15/2018 08:29 PM, Christoph Hellwig wrote:
> This way we have one central definition of it, and user can select it as
> needed.  Note that we also add a second ARCH_HAS_SWIOTLB symbol to
> indicate the architecture supports swiotlb at all, so that we can still
> make the usage optional for a few architectures that want this feature
> to be user selectable.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>


snip

> +
> +config SWIOTLB
> +	bool "SWIOTLB support"
> +	default ARCH_HAS_SWIOTLB
> +	select DMA_DIRECT_OPS
> +	select NEED_DMA_MAP_STATE
> +	select NEED_SG_DMA_LENGTH
> +	---help---
> +	  Support for IO bounce buffering for systems without an IOMMU.
> +	  This allows us to DMA to the full physical address space on
> +	  platforms where the size of a physical address is larger
> +	  than the bus address.  If unsure, say Y.
> +
>  config CHECK_SIGNATURE
>  	bool

Pulling DMA_DIRECT_OPS config option by default when SWIOTLB is enabled
makes sense. This option was also needed to be enabled separately even
to use swiotlb_dma_ops.


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[PATCH 11/12] swiotlb: move the SWIOTLB config symbol to lib/Kconfig

[Christoph Hellwig]

This way we have one central definition of it, and user can select it as
needed.  Note that we also add a second ARCH_HAS_SWIOTLB symbol to
indicate the architecture supports swiotlb at all, so that we can still
make the usage optional for a few architectures that want this feature
to be user selectable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arm/Kconfig                |  4 +---
 arch/arm64/Kconfig              |  5 ++---
 arch/ia64/Kconfig               |  9 +--------
 arch/mips/Kconfig               |  3 +++
 arch/mips/cavium-octeon/Kconfig |  5 -----
 arch/mips/loongson64/Kconfig    |  8 --------
 arch/powerpc/Kconfig            |  9 ---------
 arch/unicore32/mm/Kconfig       |  5 -----
 arch/x86/Kconfig                | 14 +++-----------
 lib/Kconfig                     | 15 +++++++++++++++
 10 files changed, 25 insertions(+), 52 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 90b81a3a28a7..f91f69174630 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -106,6 +106,7 @@ config ARM
 	select REFCOUNT_FULL
 	select RTC_LIB
 	select SYS_SUPPORTS_APM_EMULATION
+	select ARCH_HAS_SWIOTLB
 	# Above selects are sorted alphabetically; please add new ones
 	# according to that.  Thanks.
 	help
@@ -1773,9 +1774,6 @@ config SECCOMP
 	  and the task is only allowed to execute a few safe syscalls
 	  defined by each seccomp mode.
 
-config SWIOTLB
-	bool
-
 config PARAVIRT
 	bool "Enable paravirtualization code"
 	help
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 4d924eb32e7f..056bc7365adf 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -21,6 +21,7 @@ config ARM64
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
 	select ARCH_HAS_STRICT_MODULE_RWX
+	select ARCH_HAS_SWIOTLB
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
 	select ARCH_INLINE_READ_LOCK if !PREEMPT
@@ -144,6 +145,7 @@ config ARM64
 	select POWER_SUPPLY
 	select REFCOUNT_FULL
 	select SPARSE_IRQ
+	select SWIOTLB
 	select SYSCTL_EXCEPTION_TRACE
 	select THREAD_INFO_IN_TASK
 	help
@@ -239,9 +241,6 @@ config HAVE_GENERIC_GUP
 config SMP
 	def_bool y
 
-config SWIOTLB
-	def_bool y
-
 config KERNEL_MODE_NEON
 	def_bool y
 
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 685d557eea48..d396230913e6 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -56,6 +56,7 @@ config IA64
 	select HAVE_ARCH_AUDITSYSCALL
 	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
+	select ARCH_HAS_SWIOTLB
 	default y
 	help
 	  The Itanium Processor Family is Intel's 64-bit successor to
@@ -80,9 +81,6 @@ config MMU
 	bool
 	default y
 
-config SWIOTLB
-       bool
-
 config STACKTRACE_SUPPORT
 	def_bool y
 
@@ -139,7 +137,6 @@ config IA64_GENERIC
 	bool "generic"
 	select NUMA
 	select ACPI_NUMA
-	select DMA_DIRECT_OPS
 	select SWIOTLB
 	select PCI_MSI
 	help
@@ -160,7 +157,6 @@ config IA64_GENERIC
 
 config IA64_DIG
 	bool "DIG-compliant"
-	select DMA_DIRECT_OPS
 	select SWIOTLB
 
 config IA64_DIG_VTD
@@ -176,7 +172,6 @@ config IA64_HP_ZX1
 
 config IA64_HP_ZX1_SWIOTLB
 	bool "HP-zx1/sx1000 with software I/O TLB"
-	select DMA_DIRECT_OPS
 	select SWIOTLB
 	help
 	  Build a kernel that runs on HP zx1 and sx1000 systems even when they
@@ -200,7 +195,6 @@ config IA64_SGI_UV
 	bool "SGI-UV"
 	select NUMA
 	select ACPI_NUMA
-	select DMA_DIRECT_OPS
 	select SWIOTLB
 	help
 	  Selecting this option will optimize the kernel for use on UV based
@@ -211,7 +205,6 @@ config IA64_SGI_UV
 
 config IA64_HP_SIM
 	bool "Ski-simulator"
-	select DMA_DIRECT_OPS
 	select SWIOTLB
 	depends on !PM
 
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index e10cc5c7be69..b6b4c1e154f8 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -912,6 +912,8 @@ config CAVIUM_OCTEON_SOC
 	select MIPS_NR_CPU_NR_MAP_1024
 	select BUILTIN_DTB
 	select MTD_COMPLEX_MAPPINGS
+	select ARCH_HAS_SWIOTLB
+	select SWIOTLB
 	select SYS_SUPPORTS_RELOCATABLE
 	help
 	  This option supports all of the Octeon reference boards from Cavium
@@ -1367,6 +1369,7 @@ config CPU_LOONGSON3
 	select MIPS_PGD_C0_CONTEXT
 	select MIPS_L1_CACHE_SHIFT_6
 	select GPIOLIB
+	select ARCH_HAS_SWIOTLB
 	help
 		The Loongson 3 processor implements the MIPS64R2 instruction
 		set with many extensions.
diff --git a/arch/mips/cavium-octeon/Kconfig b/arch/mips/cavium-octeon/Kconfig
index 5d73041547a7..4984e462be30 100644
--- a/arch/mips/cavium-octeon/Kconfig
+++ b/arch/mips/cavium-octeon/Kconfig
@@ -67,11 +67,6 @@ config CAVIUM_OCTEON_LOCK_L2_MEMCPY
 	help
 	  Lock the kernel's implementation of memcpy() into L2.
 
-config SWIOTLB
-	def_bool y
-	select DMA_DIRECT_OPS
-	select NEED_SG_DMA_LENGTH
-
 config OCTEON_ILM
 	tristate "Module to measure interrupt latency using Octeon CIU Timer"
 	help
diff --git a/arch/mips/loongson64/Kconfig b/arch/mips/loongson64/Kconfig
index 641a1477031e..c79e6a565572 100644
--- a/arch/mips/loongson64/Kconfig
+++ b/arch/mips/loongson64/Kconfig
@@ -130,14 +130,6 @@ config LOONGSON_UART_BASE
 	default y
 	depends on EARLY_PRINTK || SERIAL_8250
 
-config SWIOTLB
-	bool "Soft IOMMU Support for All-Memory DMA"
-	default y
-	depends on CPU_LOONGSON3
-	select DMA_DIRECT_OPS
-	select NEED_SG_DMA_LENGTH
-	select NEED_DMA_MAP_STATE
-
 config PHYS48_TO_HT40
 	bool
 	default y if CPU_LOONGSON3
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index b85a537421b8..beb28153fcb2 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -474,15 +474,6 @@ config MPROFILE_KERNEL
 	depends on PPC64 && CPU_LITTLE_ENDIAN
 	def_bool !DISABLE_MPROFILE_KERNEL
 
-config SWIOTLB
-	bool "SWIOTLB support"
-	default n
-	---help---
-	  Support for IO bounce buffering for systems without an IOMMU.
-	  This allows us to DMA to the full physical address space on
-	  platforms where the size of a physical address is larger
-	  than the bus address.  Not all platforms support this.
-
 config HOTPLUG_CPU
 	bool "Support for enabling/disabling CPUs"
 	depends on SMP && (PPC_PSERIES || \
diff --git a/arch/unicore32/mm/Kconfig b/arch/unicore32/mm/Kconfig
index 1d9fed0ada71..82759b6aba67 100644
--- a/arch/unicore32/mm/Kconfig
+++ b/arch/unicore32/mm/Kconfig
@@ -39,8 +39,3 @@ config CPU_TLB_SINGLE_ENTRY_DISABLE
 	default y
 	help
 	  Say Y here to disable the TLB single entry operations.
-
-config SWIOTLB
-	def_bool y
-	select DMA_DIRECT_OPS
-	select NEED_SG_DMA_LENGTH
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a95eb9ef3311..063bef5f830f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -24,6 +24,7 @@ config X86_64
 	depends on 64BIT
 	# Options that are inherently 64-bit kernel only:
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
+	select ARCH_HAS_SWIOTLB
 	select ARCH_SUPPORTS_INT128
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select HAVE_ARCH_SOFT_DIRTY
@@ -676,6 +677,7 @@ config STA2X11
 	bool "STA2X11 Companion Chip Support"
 	depends on X86_32_NON_STANDARD && PCI
 	select ARCH_HAS_PHYS_TO_DMA
+	select ARCH_HAS_SWIOTLB
 	select X86_DEV_DMA_OPS
 	select X86_DMA_REMAP
 	select SWIOTLB
@@ -915,17 +917,6 @@ config CALGARY_IOMMU_ENABLED_BY_DEFAULT
 	  Calgary anyway, pass 'iommu=calgary' on the kernel command line.
 	  If unsure, say Y.
 
-# need this always selected by IOMMU for the VIA workaround
-config SWIOTLB
-	def_bool y if X86_64
-	select NEED_DMA_MAP_STATE
-	---help---
-	  Support for software bounce buffers used on x86-64 systems
-	  which don't have a hardware IOMMU. Using this PCI devices
-	  which can only access 32-bits of memory can be used on systems
-	  with more than 3 GB of memory.
-	  If unsure, say Y.
-
 config MAXSMP
 	bool "Enable Maximum number of SMP Processors and NUMA Nodes"
 	depends on X86_64 && SMP && DEBUG_KERNEL
@@ -1447,6 +1438,7 @@ config HIGHMEM
 config X86_PAE
 	bool "PAE (Physical Address Extension) Support"
 	depends on X86_32 && !HIGHMEM4G
+	select ARCH_HAS_SWIOTLB
 	select PHYS_ADDR_T_64BIT
 	select SWIOTLB
 	---help---
diff --git a/lib/Kconfig b/lib/Kconfig
index 1f12faf03819..01a37920949c 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -451,6 +451,21 @@ config DMA_VIRT_OPS
 	depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
 	default n
 
+config ARCH_HAS_SWIOTLB
+	bool
+
+config SWIOTLB
+	bool "SWIOTLB support"
+	default ARCH_HAS_SWIOTLB
+	select DMA_DIRECT_OPS
+	select NEED_DMA_MAP_STATE
+	select NEED_SG_DMA_LENGTH
+	---help---
+	  Support for IO bounce buffering for systems without an IOMMU.
+	  This allows us to DMA to the full physical address space on
+	  platforms where the size of a physical address is larger
+	  than the bus address.  If unsure, say Y.
+
 config CHECK_SIGNATURE
 	bool
 
-- 
2.17.0