Re: [PATCH v9 3/6] riscv: mm: dma-noncoherent: nonstandard cache operations support

[Lad, Prabhakar]

Hi Geert,

Thank you for the review.

On Wed, Jun 14, 2023 at 1:53 PM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
>
> Hi Prabhakar,
>
> On Wed, Jun 14, 2023 at 12:48 PM Prabhakar <prabhakar.csengg@xxxxxxxxx> wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> >
> > Introduce support for nonstandard noncoherent systems in the RISC-V
> > architecture. It enables function pointer support to handle cache
> > management in such systems.
> >
> > This patch adds a new configuration option called
> > "RISCV_NONSTANDARD_CACHE_OPS." This option is a boolean flag that
> > depends on "RISCV_DMA_NONCOHERENT" and enables the function pointer
> > support for cache management in nonstandard noncoherent systems.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> > ---
> > v8 -> v9
> > * New patch
>
> Thanks for your patch!
>
> > --- /dev/null
> > +++ b/arch/riscv/include/asm/dma-noncoherent.h
> > @@ -0,0 +1,28 @@
> > +/* SPDX-License-Identifier: GPL-2.0-only */
> > +/*
> > + * Copyright (C) 2023 Renesas Electronics Corp.
> > + */
> > +
> > +#ifndef __ASM_DMA_NONCOHERENT_H
> > +#define __ASM_DMA_NONCOHERENT_H
> > +
> > +#include <linux/dma-direct.h>
> > +
> > +/*
> > + * struct riscv_cache_ops - Structure for CMO function pointers
> > + *
> > + * @clean: Function pointer for clean cache
> > + * @inval: Function pointer for invalidate cache
> > + * @flush: Function pointer for flushing the cache
> > + */
> > +struct riscv_cache_ops {
> > +       void (*clean)(phys_addr_t paddr, unsigned long size);
> > +       void (*inval)(phys_addr_t paddr, unsigned long size);
> > +       void (*flush)(phys_addr_t paddr, unsigned long size);
> > +};
>
> I guess the naming can be improved?
>
> .clean() is used by arch_dma_cache_wback() / arch_wb_cache_pmem(),
> .inval() is used by arch_dma_cache_inv() / arch_invalidate_pmem(),
> .flush() is used by arch_dma_cache_wback_inv() / arch_dma_prep_coherent().
>
> Perhaps .wback(), .inv(), .wback_inv() are more clear?
>
Ok I will update pointer names in the next version.

Cheers,
Prabhakar