riscv: only select DMA_DIRECT_REMAP from RISCV_ISA_ZICBOM and ERRATA_THEAD_PBMT

RISCV_DMA_NONCOHERENT is also used for whacky non-standard
non-coherent ops that use different hooks in dma-direct.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Reviewed-by: Robin Murphy <[email protected]>
Reviewed-by: Lad Prabhakar <[email protected]>
Tested-by: Samuel Holland <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Geert Uytterhoeven <[email protected]>

Author: Christoph Hellwig

arch/riscv/Kconfig

@@ -273,7 +273,6 @@ config RISCV_DMA_NONCOHERENT
 	select ARCH_HAS_SYNC_DMA_FOR_CPU
 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
 	select DMA_BOUNCE_UNALIGNED_KMALLOC if SWIOTLB
-	select DMA_DIRECT_REMAP if MMU
 
 config RISCV_NONSTANDARD_CACHE_OPS
 	bool
@@ -549,6 +548,7 @@ config RISCV_ISA_ZICBOM
 	depends on RISCV_ALTERNATIVE
 	default y
 	select RISCV_DMA_NONCOHERENT
+	select DMA_DIRECT_REMAP
 	help
 	   Adds support to dynamically detect the presence of the ZICBOM
 	   extension (Cache Block Management Operations) and enable its

arch/riscv/Kconfig.errata

@@ -77,6 +77,7 @@ config ERRATA_THEAD_PBMT
 config ERRATA_THEAD_CMO
 	bool "Apply T-Head cache management errata"
 	depends on ERRATA_THEAD && MMU
+	select DMA_DIRECT_REMAP
 	select RISCV_DMA_NONCOHERENT
 	default y
 	help