Re: [PATCH v5 4/6] riscv: mm: dma-noncoherent: Pass direction and operation to ALT_CMO_OP()

[Conor Dooley <conor@kernel.org>]

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Hey Prabhakar,

On Mon, Dec 12, 2022 at 11:55:03AM +0000, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> 
> Pass direction and operation to ALT_CMO_OP() macro.
> 
> Vendors might want to perform different operations based on the direction
> and callbacks (arch_sync_dma_for_device/arch_sync_dma_for_cpu/
> arch_dma_prep_coherent) so to handle such cases pass the direction and
> operation to ALT_CMO_OP() macro. This is in preparation for adding errata
> for the Andes CPU core.

This patch seems to break the build on top of the most recent
linux-next:
......./stuff/linux/arch/riscv/mm/pmem.c:13:53: error: too few arguments provided to function-like macro invocation
        ALT_CMO_OP(clean, addr, size, riscv_cbom_block_size);
                                                           ^
/stuff/linux/arch/riscv/include/asm/errata_list.h:127:9: note: macro 'ALT_CMO_OP' defined here
#define ALT_CMO_OP(_op, _start, _size, _cachesize, _dir, _ops)          \
        ^
..  CC      block/partitions/sgi.o
.+...+/stuff/linux/arch/riscv/mm/pmem.c:13:2: error: use of undeclared identifier 'ALT_CMO_OP'
        ALT_CMO_OP(clean, addr, size, riscv_cbom_block_size);
        ^
/stuff/linux/arch/riscv/mm/pmem.c:19:53: error: too few arguments provided to function-like macro invocation
        ALT_CMO_OP(inval, addr, size, riscv_cbom_block_size);
                                                           ^
/stuff/linux/arch/riscv/include/asm/errata_list.h:127:9: note: macro 'ALT_CMO_OP' defined here
#define ALT_CMO_OP(_op, _start, _size, _cachesize, _dir, _ops)          \
        ^
...........  AR      lib/math/built-in.a
./stuff/linux/arch/riscv/mm/pmem.c:19:2: .error: use of undeclared identifier 'ALT_CMO_OP'
        ALT_CMO_OP(inval, addr, size, riscv_cbom_block_size);
        ^
..4 errors generated.

The pmem stuff is new so that'd be why it has not come up before.

(FWIW, clang allmodconfig)

> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> v4 -> v5
> * Updated commit message.
> 
> RFC v3 -> v4
> * New patch
> ---
>  arch/riscv/include/asm/cacheflush.h  |  4 ++++
>  arch/riscv/include/asm/errata_list.h |  8 ++++++--
>  arch/riscv/mm/dma-noncoherent.c      | 15 ++++++++++-----
>  3 files changed, 20 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h
> index 03e3b95ae6da..e22019668b9e 100644
> --- a/arch/riscv/include/asm/cacheflush.h
> +++ b/arch/riscv/include/asm/cacheflush.h
> @@ -8,6 +8,10 @@
>  
>  #include <linux/mm.h>
>  
> +#define NON_COHERENT_SYNC_DMA_FOR_DEVICE	0
> +#define NON_COHERENT_SYNC_DMA_FOR_CPU		1
> +#define NON_COHERENT_DMA_PREP			2
> +
>  static inline void local_flush_icache_all(void)
>  {
>  	asm volatile ("fence.i" ::: "memory");
> diff --git a/arch/riscv/include/asm/errata_list.h b/arch/riscv/include/asm/errata_list.h
> index 2ba7e6e74540..48e899a8e7a9 100644
> --- a/arch/riscv/include/asm/errata_list.h
> +++ b/arch/riscv/include/asm/errata_list.h
> @@ -124,7 +124,7 @@ asm volatile(ALTERNATIVE(						\
>  #define THEAD_flush_A0	".long 0x0275000b"
>  #define THEAD_SYNC_S	".long 0x0190000b"
>  
> -#define ALT_CMO_OP(_op, _start, _size, _cachesize)			\
> +#define ALT_CMO_OP(_op, _start, _size, _cachesize, _dir, _ops)		\
>  asm volatile(ALTERNATIVE_2(						\
>  	__nops(6),							\
>  	"mv a0, %1\n\t"							\
> @@ -146,7 +146,11 @@ asm volatile(ALTERNATIVE_2(						\
>  			ERRATA_THEAD_CMO, CONFIG_ERRATA_THEAD_CMO)	\
>  	: : "r"(_cachesize),						\
>  	    "r"((unsigned long)(_start) & ~((_cachesize) - 1UL)),	\
> -	    "r"((unsigned long)(_start) + (_size))			\
> +	    "r"((unsigned long)(_start) + (_size)),			\
> +	    "r"((unsigned long)(_start)),				\
> +	    "r"((unsigned long)(_size)),				\
> +	    "r"((unsigned long)(_dir)),					\
> +	    "r"((unsigned long)(_ops))					\
>  	: "a0")
>  
>  #define THEAD_C9XX_RV_IRQ_PMU			17
> diff --git a/arch/riscv/mm/dma-noncoherent.c b/arch/riscv/mm/dma-noncoherent.c
> index d919efab6eba..e2b82034f504 100644
> --- a/arch/riscv/mm/dma-noncoherent.c
> +++ b/arch/riscv/mm/dma-noncoherent.c
> @@ -19,13 +19,16 @@ void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
>  
>  	switch (dir) {
>  	case DMA_TO_DEVICE:
> -		ALT_CMO_OP(clean, vaddr, size, riscv_cbom_block_size);
> +		ALT_CMO_OP(clean, vaddr, size, riscv_cbom_block_size,
> +			   dir, NON_COHERENT_SYNC_DMA_FOR_DEVICE);
>  		break;
>  	case DMA_FROM_DEVICE:
> -		ALT_CMO_OP(clean, vaddr, size, riscv_cbom_block_size);
> +		ALT_CMO_OP(clean, vaddr, size, riscv_cbom_block_size,
> +			   dir, NON_COHERENT_SYNC_DMA_FOR_DEVICE);
>  		break;
>  	case DMA_BIDIRECTIONAL:
> -		ALT_CMO_OP(flush, vaddr, size, riscv_cbom_block_size);
> +		ALT_CMO_OP(flush, vaddr, size, riscv_cbom_block_size,
> +			   dir, NON_COHERENT_SYNC_DMA_FOR_DEVICE);
>  		break;
>  	default:
>  		break;
> @@ -42,7 +45,8 @@ void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
>  		break;
>  	case DMA_FROM_DEVICE:
>  	case DMA_BIDIRECTIONAL:
> -		ALT_CMO_OP(flush, vaddr, size, riscv_cbom_block_size);
> +		ALT_CMO_OP(flush, vaddr, size, riscv_cbom_block_size,
> +			   dir, NON_COHERENT_SYNC_DMA_FOR_CPU);
>  		break;
>  	default:
>  		break;
> @@ -53,7 +57,8 @@ void arch_dma_prep_coherent(struct page *page, size_t size)
>  {
>  	void *flush_addr = page_address(page);
>  
> -	ALT_CMO_OP(flush, flush_addr, size, riscv_cbom_block_size);
> +	ALT_CMO_OP(flush, flush_addr, size, riscv_cbom_block_size,
> +		   0, NON_COHERENT_DMA_PREP);
>  }
>  
>  void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
> -- 
> 2.25.1
> 

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