Merge patch series "riscv: dma-mapping: unify support for cache flushes"

Prabhakar <prabhakar.csengg@gmail.com> says:

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

This patch series is a subset from Arnd's original series [0]. Ive just
picked up the bits required for RISC-V unification of cache flushing.
Remaining patches from the series [0] will be taken care by Arnd soon.

* b4-shazam-merge:
  riscv: dma-mapping: switch over to generic implementation
  riscv: dma-mapping: skip invalidation before bidirectional DMA
  riscv: dma-mapping: only invalidate after DMA, not flush

Link: https://lore.kernel.org/r/20230816232336.164413-1-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

diff --cc arch/riscv/mm/dma-noncoherent.c
index 7270b4d,06b8fea..f269990
--- 1/arch/riscv/mm/dma-noncoherent.c
--- 2/arch/riscv/mm/dma-noncoherent.c
+++ b/arch/riscv/mm/dma-noncoherent.c
@@@ -11,11 -11,22 +11,24 @@@
  #include <asm/cacheflush.h>
  
  static bool noncoherent_supported __ro_after_init;
 +int dma_cache_alignment __ro_after_init = ARCH_DMA_MINALIGN;
 +EXPORT_SYMBOL_GPL(dma_cache_alignment);
  
- void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
-                             enum dma_data_direction dir)
+ static inline void arch_dma_cache_wback(phys_addr_t paddr, size_t size)
+ {
+       void *vaddr = phys_to_virt(paddr);
+ 
+       ALT_CMO_OP(clean, vaddr, size, riscv_cbom_block_size);
+ }
+ 
+ static inline void arch_dma_cache_inv(phys_addr_t paddr, size_t size)
+ {
+       void *vaddr = phys_to_virt(paddr);
+ 
+       ALT_CMO_OP(inval, vaddr, size, riscv_cbom_block_size);
+ }
+ 
+ static inline void arch_dma_cache_wback_inv(phys_addr_t paddr, size_t size)
  {
        void *vaddr = phys_to_virt(paddr);