MIPS: make the default mips dma implementation optional

Octeon and loonson64 already don't use it at all, and we're going to
migrate more plaforms away from it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19536/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org

arch/mips/Kconfig

@@ -77,6 +77,9 @@ config MIPS
 	select SYSCTL_EXCEPTION_TRACE
 	select VIRT_TO_BUS
 
+config MIPS_DMA_DEFAULT
+	bool
+
 menu "Machine selection"
 
 choice
@@ -98,6 +101,7 @@ config MIPS_GENERIC
 	select IRQ_MIPS_CPU
 	select LIBFDT
 	select MIPS_CPU_SCACHE
+	select MIPS_DMA_DEFAULT
 	select MIPS_GIC
 	select MIPS_L1_CACHE_SHIFT_7
 	select NO_EXCEPT_FILL
@@ -141,6 +145,7 @@ config MIPS_ALCHEMY
 	select CEVT_R4K
 	select CSRC_R4K
 	select IRQ_MIPS_CPU
+	select MIPS_DMA_DEFAULT
 	select DMA_MAYBE_COHERENT	# Au1000,1500,1100 aren't, rest is
 	select SYS_HAS_CPU_MIPS32_R1
 	select SYS_SUPPORTS_32BIT_KERNEL
@@ -156,6 +161,7 @@ config AR7
 	select CEVT_R4K
 	select CSRC_R4K
 	select IRQ_MIPS_CPU
+	select MIPS_DMA_DEFAULT
 	select NO_EXCEPT_FILL
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_MIPS32_R1
@@ -178,6 +184,7 @@ config ATH25
 	select DMA_NONCOHERENT
 	select IRQ_MIPS_CPU
 	select IRQ_DOMAIN
+	select MIPS_DMA_DEFAULT
 	select SYS_HAS_CPU_MIPS32_R1
 	select SYS_SUPPORTS_BIG_ENDIAN
 	select SYS_SUPPORTS_32BIT_KERNEL
@@ -197,6 +204,7 @@ config ATH79
 	select COMMON_CLK
 	select CLKDEV_LOOKUP
 	select IRQ_MIPS_CPU
+	select MIPS_DMA_DEFAULT
 	select MIPS_MACHINE
 	select SYS_HAS_CPU_MIPS32_R2
 	select SYS_HAS_EARLY_PRINTK
@@ -223,6 +231,7 @@ config BMIPS_GENERIC
 	select BCM7120_L2_IRQ
 	select BRCMSTB_L2_IRQ
 	select IRQ_MIPS_CPU
+	select MIPS_DMA_DEFAULT
 	select DMA_NONCOHERENT
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_LITTLE_ENDIAN
@@ -253,6 +262,7 @@ config BCM47XX
 	select HW_HAS_PCI
 	select IRQ_MIPS_CPU
 	select SYS_HAS_CPU_MIPS32_R1
+	select MIPS_DMA_DEFAULT
 	select NO_EXCEPT_FILL
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_LITTLE_ENDIAN
@@ -276,6 +286,7 @@ config BCM63XX
 	select SYNC_R4K
 	select DMA_NONCOHERENT
 	select IRQ_MIPS_CPU
+	select MIPS_DMA_DEFAULT
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN
 	select SYS_HAS_EARLY_PRINTK
@@ -298,6 +309,7 @@ config MIPS_COBALT
 	select I8259
 	select IRQ_MIPS_CPU
 	select IRQ_GT641XX
+	select MIPS_DMA_DEFAULT
 	select PCI_GT64XXX_PCI0
 	select PCI
 	select SYS_HAS_CPU_NEVADA
@@ -318,6 +330,7 @@ config MACH_DECSTATION
 	select CPU_R4000_WORKAROUNDS if 64BIT
 	select CPU_R4400_WORKAROUNDS if 64BIT
 	select DMA_NONCOHERENT
+	select MIPS_DMA_DEFAULT
 	select NO_IOPORT_MAP
 	select IRQ_MIPS_CPU
 	select SYS_HAS_CPU_R3000
@@ -377,6 +390,7 @@ config MACH_INGENIC
 	select SYS_SUPPORTS_ZBOOT_UART16550
 	select DMA_NONCOHERENT
 	select IRQ_MIPS_CPU
+	select MIPS_DMA_DEFAULT
 	select PINCTRL
 	select GPIOLIB
 	select COMMON_CLK
@@ -391,6 +405,7 @@ config LANTIQ
 	select IRQ_MIPS_CPU
 	select CEVT_R4K
 	select CSRC_R4K
+	select MIPS_DMA_DEFAULT
 	select SYS_HAS_CPU_MIPS32_R1
 	select SYS_HAS_CPU_MIPS32_R2
 	select SYS_SUPPORTS_BIG_ENDIAN
@@ -418,6 +433,7 @@ config LASAT
 	select SYS_HAS_EARLY_PRINTK
 	select HW_HAS_PCI
 	select IRQ_MIPS_CPU
+	select MIPS_DMA_DEFAULT
 	select PCI_GT64XXX_PCI0
 	select MIPS_NILE4
 	select R5000_CPU_SCACHE
@@ -464,6 +480,7 @@ config MACH_PISTACHIO
 	select LIBFDT
 	select MFD_SYSCON
 	select MIPS_CPU_SCACHE
+	select MIPS_DMA_DEFAULT
 	select MIPS_GIC
 	select PINCTRL
 	select REGULATOR
@@ -496,6 +513,7 @@ config MIPS_MALTA
 	select GENERIC_ISA_DMA
 	select HAVE_PCSPKR_PLATFORM
 	select IRQ_MIPS_CPU
+	select MIPS_DMA_DEFAULT
 	select MIPS_GIC
 	select HW_HAS_PCI
 	select I8253
@@ -552,6 +570,7 @@ config NEC_MARKEINS
 	bool "NEC EMMA2RH Mark-eins board"
 	select SOC_EMMA2RH
 	select HW_HAS_PCI
+	select MIPS_DMA_DEFAULT
 	help
 	  This enables support for the NEC Electronics Mark-eins boards.
 
@@ -565,12 +584,14 @@ config MACH_VR41XX
 
 config NXP_STB220
 	bool "NXP STB220 board"
+	select MIPS_DMA_DEFAULT
 	select SOC_PNX833X
 	help
 	 Support for NXP Semiconductors STB220 Development Board.
 
 config NXP_STB225
 	bool "NXP 225 board"
+	select MIPS_DMA_DEFAULT
 	select SOC_PNX833X
 	select SOC_PNX8335
 	help
@@ -590,6 +611,7 @@ config PMC_MSP
 	select SYS_SUPPORTS_BIG_ENDIAN
 	select SYS_SUPPORTS_MIPS16
 	select IRQ_MIPS_CPU
+	select MIPS_DMA_DEFAULT
 	select SERIAL_8250
 	select SERIAL_8250_CONSOLE
 	select USB_EHCI_BIG_ENDIAN_MMIO
@@ -607,6 +629,7 @@ config RALINK
 	select BOOT_RAW
 	select DMA_NONCOHERENT
 	select IRQ_MIPS_CPU
+	select MIPS_DMA_DEFAULT
 	select USE_OF
 	select SYS_HAS_CPU_MIPS32_R1
 	select SYS_HAS_CPU_MIPS32_R2
@@ -633,6 +656,7 @@ config SGI_IP22
 	select I8259
 	select IP22_CPU_SCACHE
 	select IRQ_MIPS_CPU
+	select MIPS_DMA_DEFAULT
 	select GENERIC_ISA_DMA_SUPPORT_BROKEN
 	select SGI_HAS_I8042
 	select SGI_HAS_INDYDOG
@@ -666,6 +690,7 @@ config SGI_IP27
 	select FW_ARC64
 	select BOOT_ELF64
 	select DEFAULT_SGI_PARTITION
+	select MIPS_DMA_DEFAULT
 	select SYS_HAS_EARLY_PRINTK
 	select HW_HAS_PCI
 	select NR_CPUS_DEFAULT_64
@@ -692,6 +717,7 @@ config SGI_IP28
 	select DMA_NONCOHERENT
 	select GENERIC_ISA_DMA_SUPPORT_BROKEN
 	select IRQ_MIPS_CPU
+	select MIPS_DMA_DEFAULT
 	select HW_HAS_EISA
 	select I8253
 	select I8259
@@ -728,6 +754,7 @@ config SGI_IP32
 	select DMA_NONCOHERENT
 	select HW_HAS_PCI
 	select IRQ_MIPS_CPU
+	select MIPS_DMA_DEFAULT
 	select R5000_CPU_SCACHE
 	select RM7000_CPU_SCACHE
 	select SYS_HAS_CPU_R5000
@@ -742,6 +769,7 @@ config SGI_IP32
 config SIBYTE_CRHINE
 	bool "Sibyte BCM91120C-CRhine"
 	select BOOT_ELF32
+	select MIPS_DMA_DEFAULT
 	select SIBYTE_BCM1120
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_SB1
@@ -751,6 +779,7 @@ config SIBYTE_CRHINE
 config SIBYTE_CARMEL
 	bool "Sibyte BCM91120x-Carmel"
 	select BOOT_ELF32
+	select MIPS_DMA_DEFAULT
 	select SIBYTE_BCM1120
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_SB1
@@ -760,6 +789,7 @@ config SIBYTE_CARMEL
 config SIBYTE_CRHONE
 	bool "Sibyte BCM91125C-CRhone"
 	select BOOT_ELF32
+	select MIPS_DMA_DEFAULT
 	select SIBYTE_BCM1125
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_SB1
@@ -770,6 +800,7 @@ config SIBYTE_CRHONE
 config SIBYTE_RHONE
 	bool "Sibyte BCM91125E-Rhone"
 	select BOOT_ELF32
+	select MIPS_DMA_DEFAULT
 	select SIBYTE_BCM1125H
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_SB1
@@ -780,6 +811,7 @@ config SIBYTE_SWARM
 	bool "Sibyte BCM91250A-SWARM"
 	select BOOT_ELF32
 	select HAVE_PATA_PLATFORM
+	select MIPS_DMA_DEFAULT
 	select SIBYTE_SB1250
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_SB1
@@ -792,6 +824,7 @@ config SIBYTE_LITTLESUR
 	bool "Sibyte BCM91250C2-LittleSur"
 	select BOOT_ELF32
 	select HAVE_PATA_PLATFORM
+	select MIPS_DMA_DEFAULT
 	select SIBYTE_SB1250
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_SB1
@@ -802,6 +835,7 @@ config SIBYTE_LITTLESUR
 config SIBYTE_SENTOSA
 	bool "Sibyte BCM91250E-Sentosa"
 	select BOOT_ELF32
+	select MIPS_DMA_DEFAULT
 	select SIBYTE_SB1250
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_SB1
@@ -811,6 +845,7 @@ config SIBYTE_SENTOSA
 config SIBYTE_BIGSUR
 	bool "Sibyte BCM91480B-BigSur"
 	select BOOT_ELF32
+	select MIPS_DMA_DEFAULT
 	select NR_CPUS_DEFAULT_4
 	select SIBYTE_BCM1x80
 	select SWAP_IO_SPACE
@@ -841,6 +876,7 @@ config SNI_RM
 	select I8253
 	select I8259
 	select ISA
+	select MIPS_DMA_DEFAULT
 	select SWAP_IO_SPACE if CPU_BIG_ENDIAN
 	select SYS_HAS_CPU_R4X00
 	select SYS_HAS_CPU_R5000
@@ -871,6 +907,7 @@ config MIKROTIK_RB532
 	select DMA_NONCOHERENT
 	select HW_HAS_PCI
 	select IRQ_MIPS_CPU
+	select MIPS_DMA_DEFAULT
 	select SYS_HAS_CPU_MIPS32_R1
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_LITTLE_ENDIAN
@@ -929,6 +966,7 @@ config NLM_XLR_BOARD
 	select SYS_HAS_CPU_XLR
 	select SYS_SUPPORTS_SMP
 	select HW_HAS_PCI
+	select MIPS_DMA_DEFAULT
 	select SWAP_IO_SPACE
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_64BIT_KERNEL
@@ -955,6 +993,7 @@ config NLM_XLP_BOARD
 	select SYS_HAS_CPU_XLP
 	select SYS_SUPPORTS_SMP
 	select HW_HAS_PCI
+	select MIPS_DMA_DEFAULT
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_64BIT_KERNEL
 	select PHYS_ADDR_T_64BIT
@@ -980,6 +1019,7 @@ config MIPS_PARAVIRT
 	bool "Para-Virtualized guest system"
 	select CEVT_R4K
 	select CSRC_R4K
+	select MIPS_DMA_DEFAULT
 	select SYS_SUPPORTS_64BIT_KERNEL
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN

arch/mips/include/asm/dma-mapping.h

@@ -17,8 +17,10 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 #ifdef CONFIG_SWIOTLB
 	return &mips_swiotlb_ops;
-#else
+#elif defined(CONFIG_MIPS_DMA_DEFAULT)
 	return &mips_default_dma_map_ops;
+#else
+	return NULL;
 #endif
 }
 

arch/mips/jazz/Kconfig

@@ -3,6 +3,7 @@ config ACER_PICA_61
 	bool "Support for Acer PICA 1 chipset"
 	depends on MACH_JAZZ
 	select DMA_NONCOHERENT
+	select MIPS_DMA_DEFAULT
 	select SYS_SUPPORTS_LITTLE_ENDIAN
 	help
 	  This is a machine with a R4400 133/150 MHz CPU. To compile a Linux
@@ -14,6 +15,7 @@ config MIPS_MAGNUM_4000
 	bool "Support for MIPS Magnum 4000"
 	depends on MACH_JAZZ
 	select DMA_NONCOHERENT
+	select MIPS_DMA_DEFAULT
 	select SYS_SUPPORTS_BIG_ENDIAN
 	select SYS_SUPPORTS_LITTLE_ENDIAN
 	help
@@ -26,6 +28,7 @@ config OLIVETTI_M700
 	bool "Support for Olivetti M700-10"
 	depends on MACH_JAZZ
 	select DMA_NONCOHERENT
+	select MIPS_DMA_DEFAULT
 	select SYS_SUPPORTS_LITTLE_ENDIAN
 	help
 	  This is a machine with a R4000 100 MHz CPU. To compile a Linux

arch/mips/loongson32/Kconfig

@@ -10,6 +10,7 @@ config LOONGSON1_LS1B
 	select CSRC_R4K if !MIPS_EXTERNAL_TIMER
 	select SYS_HAS_CPU_LOONGSON1B
 	select DMA_NONCOHERENT
+	select MIPS_DMA_DEFAULT
 	select BOOT_ELF32
 	select IRQ_MIPS_CPU
 	select SYS_SUPPORTS_32BIT_KERNEL
@@ -26,6 +27,7 @@ config LOONGSON1_LS1C
 	select CSRC_R4K if !MIPS_EXTERNAL_TIMER
 	select SYS_HAS_CPU_LOONGSON1C
 	select DMA_NONCOHERENT
+	select MIPS_DMA_DEFAULT
 	select BOOT_ELF32
 	select IRQ_MIPS_CPU
 	select SYS_SUPPORTS_32BIT_KERNEL

arch/mips/loongson64/Kconfig

@@ -13,6 +13,7 @@ config LEMOTE_FULOONG2E
 	select CSRC_R4K
 	select SYS_HAS_CPU_LOONGSON2E
 	select DMA_NONCOHERENT
+	select MIPS_DMA_DEFAULT
 	select BOOT_ELF32
 	select BOARD_SCACHE
 	select HW_HAS_PCI
@@ -44,6 +45,7 @@ config LEMOTE_MACH2F
 	select CS5536
 	select CSRC_R4K if ! MIPS_EXTERNAL_TIMER
 	select DMA_NONCOHERENT
+	select MIPS_DMA_DEFAULT
 	select GENERIC_ISA_DMA_SUPPORT_BROKEN
 	select HAVE_CLK
 	select HW_HAS_PCI

arch/mips/mm/Makefile

@@ -3,7 +3,7 @@
 # Makefile for the Linux/MIPS-specific parts of the memory manager.
 #
 
-obj-y				+= cache.o dma-default.o extable.o fault.o \
+obj-y				+= cache.o extable.o fault.o \
 				   gup.o init.o mmap.o page.o page-funcs.o \
 				   pgtable.o tlbex.o tlbex-fault.o tlb-funcs.o
 
@@ -17,6 +17,7 @@ obj-$(CONFIG_32BIT)		+= ioremap.o pgtable-32.o
 obj-$(CONFIG_64BIT)		+= pgtable-64.o
 obj-$(CONFIG_HIGHMEM)		+= highmem.o
 obj-$(CONFIG_HUGETLB_PAGE)	+= hugetlbpage.o
+obj-$(CONFIG_MIPS_DMA_DEFAULT)	+= dma-default.o
 obj-$(CONFIG_SWIOTLB)		+= dma-swiotlb.o
 
 obj-$(CONFIG_CPU_R4K_CACHE_TLB) += c-r4k.o cex-gen.o tlb-r4k.o

arch/mips/pic32/Kconfig

@@ -11,6 +11,7 @@ config PIC32MZDA
 	select CEVT_R4K
 	select CSRC_R4K
 	select DMA_NONCOHERENT
+	select MIPS_DMA_DEFAULT
 	select SYS_HAS_CPU_MIPS32_R2
 	select SYS_HAS_EARLY_PRINTK
 	select SYS_SUPPORTS_32BIT_KERNEL