linux-kernel - Re: linux-next: Tree for Nov 22 (riscv: DMA_GLOBAL

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Date:   Thu, 30 Nov 2023 16:35:08 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Subject: Re: linux-next: Tree for Nov 22 (riscv: DMA_GLOBAL_POOL)

On Wed, Nov 22, 2023 at 02:37:43PM -0800, Randy Dunlap wrote:
> 
> 
> On 11/21/23 19:52, Stephen Rothwell wrote:
> > Hi all,
> > 
> > Changes since 20231121:
> > 
> 
> on riscv 32-bit:
> 
> WARNING: unmet direct dependencies detected for DMA_GLOBAL_POOL
>   Depends on [n]: !ARCH_HAS_DMA_SET_UNCACHED [=n] && !DMA_DIRECT_REMAP [=y]
>   Selected by [y]:
>   - ARCH_R9A07G043 [=y] && SOC_RENESAS [=y] && RISCV [=y] && NONPORTABLE [=y] && RISCV_ALTERNATIVE [=y] && !RISCV_ISA_ZICBOM [=n] && RISCV_SBI [=y]
> 
> WARNING: unmet direct dependencies detected for DMA_GLOBAL_POOL
>   Depends on [n]: !ARCH_HAS_DMA_SET_UNCACHED [=n] && !DMA_DIRECT_REMAP [=y]
>   Selected by [y]:
>   - ARCH_R9A07G043 [=y] && SOC_RENESAS [=y] && RISCV [=y] && NONPORTABLE [=y] && RISCV_ALTERNATIVE [=y] && !RISCV_ISA_ZICBOM [=n] && RISCV_SBI [=y]

DMA_DIRECT_REMAP is selected by the T-HEAD CMO erratum.
DMA_GLOBAL_POOL by the Andes CMO erratum.

We could do

diff --git a/drivers/soc/renesas/Kconfig b/drivers/soc/renesas/Kconfig
index 0071864c2111..d8723fdf1e55 100644
--- a/drivers/soc/renesas/Kconfig
+++ b/drivers/soc/renesas/Kconfig
@@ -339,6 +339,7 @@ if RISCV
 
 config ARCH_R9A07G043
 	bool "RISC-V Platform support for RZ/Five"
+	depends on !DMA_DIRECT_REMAP
 	depends on NONPORTABLE
 	depends on RISCV_ALTERNATIVE
 	depends on !RISCV_ISA_ZICBOM


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