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Subject: Re: Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI board
 installed, unless RAM size limited to 3500M
To:     Mike Rapoport <rppt@linux.ibm.com>, Christoph Hellwig <hch@lst.de>
Cc:     Robin Murphy <robin.murphy@arm.com>, linux-arch@vger.kernel.org,
        darren@stevens-zone.net, mad skateman <madskateman@gmail.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        iommu@lists.linux-foundation.org, Rob Herring <robh+dt@kernel.org>,
        paulus@samba.org, rtd2@xtra.co.nz,
        "contact@a-eon.com" <contact@a-eon.com>,
        linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
        nsaenzjulienne@suse.de
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 <20191126164026.GA8026@lst.de> <20191127065624.GB16913@linux.ibm.com>
From:   Christian Zigotzky <chzigotzky@xenosoft.de>
Message-ID: <6a4289cf-d2b5-2357-f1ad-eeab44ab3b1e@xenosoft.de>
Date:   Wed, 27 Nov 2019 16:14:43 +0100
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On 27 November 2019 at 07:56 am, Mike Rapoport wrote:
>
> Maybe we'll simply force bottom up allocation before calling
> swiotlb_init()? Anyway, it's the last memblock allocation.
>
>
> diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
> index 62f74b1b33bd..771e6cf7e2b9 100644
> --- a/arch/powerpc/mm/mem.c
> +++ b/arch/powerpc/mm/mem.c
> @@ -286,14 +286,15 @@ void __init mem_init(void)
>   	/*
>   	 * book3s is limited to 16 page sizes due to encoding this in
>   	 * a 4-bit field for slices.
>   	 */
>   	BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
>   
>   #ifdef CONFIG_SWIOTLB
> +	memblock_set_bottom_up(true);
>   	swiotlb_init(0);
>   #endif
>   
>   	high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
>   	set_max_mapnr(max_pfn);
>   	memblock_free_all();
>   
>   
Hello Mike,

I tested the latest Git kernel with your new patch today. My PCI TV card 
works without any problems.

Thanks,
Christian