linux-kernel - Re: [PATCH v2 09/11] dma-direct: turn ARCH_ZONE_DMA

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Date:   Mon, 26 Aug 2019 21:33:51 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        catalin.marinas@....com, hch@....de, wahrenst@....net,
        marc.zyngier@....com, robh+dt@...nel.org,
        Robin Murphy <robin.murphy@....com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arch@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
        Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     f.fainelli@...il.com, will@...nel.org, nsaenzjulienne@...e.de,
        linux-kernel@...r.kernel.org, eric@...olt.net, mbrugger@...e.com,
        linux-rpi-kernel@...ts.infradead.org, akpm@...ux-foundation.org,
        frowand.list@...il.com,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH v2 09/11] dma-direct: turn ARCH_ZONE_DMA_BITS into a variable

Nicolas Saenz Julienne <nsaenzjulienne@...e.de> writes:
> diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
> index 0d52f57fca04..73668a21ae78 100644
> --- a/arch/powerpc/include/asm/page.h
> +++ b/arch/powerpc/include/asm/page.h
> @@ -319,13 +319,4 @@ struct vm_area_struct;
>  #endif /* __ASSEMBLY__ */
>  #include <asm/slice.h>
>  
> -/*
> - * Allow 30-bit DMA for very limited Broadcom wifi chips on many powerbooks.

This comment got lost.

> diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
> index 9191a66b3bc5..2a69f87585df 100644
> --- a/arch/powerpc/mm/mem.c
> +++ b/arch/powerpc/mm/mem.c
> @@ -237,9 +238,14 @@ void __init paging_init(void)
>  	printk(KERN_DEBUG "Memory hole size: %ldMB\n",
>  	       (long int)((top_of_ram - total_ram) >> 20));
>  
> +	if (IS_ENABLED(CONFIG_PPC32))

Can you please propagate it here?

> +		zone_dma_bits = 30;
> +	else
> +		zone_dma_bits = 31;
> +

cheers