linux-kernel - Re: [PATCH v3 0/3] MIPS: SiByte: Handle PCI DMA with 64-bit memory addressing

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Date:   Mon, 19 Nov 2018 19:06:37 +0000
From:   Paul Burton <paul.burton@...s.com>
To:     "Maciej W. Rozycki" <macro@...ux-mips.org>
CC:     Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <pburton@...ecomp.com>,
        Christoph Hellwig <hch@....de>,
        "linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>
Subject: Re: [PATCH v3 0/3] MIPS: SiByte: Handle PCI DMA with 64-bit memory
  addressing

Hello,

Maciej W. Rozycki wrote:
> Hi,
> 
> This mini patch series enables correct support for DMA in the presence of
> memory outside the 32-bit address range with the Broadcom SiByte SOCs and
> the relevant development boards.
> 
> There is a quirk in the BCM1250, BCM1125 and BCM1125H SOCs in that their
> onchip 32-bit PCI host bridge does not support DAC, however the HT link
> (where available) does support 40-bit addressing as per the HT spec.
> Therefore the first patch sets the bus mask accordingly, and then the
> second patch enables swiotlb.  See individual change descriptions for
> additional details; there's also a further discussion alongside.
> 
> This has been verified with a Broadcom SWARM board equipped with 3200MiB
> of RAM (2176MiB of which the address decoder in the SOC maps above 4GiB),
> a pair of DEFPA FDDI adapters and an XHCI USB adapter.  There were also
> some other PCI and PCIe devices present in the system, though not actively
> used beyond being probed at boot, and none has shown any symptoms of
> breakage.
> 
> I have come across commit 9d7a224b463e ("dma-direct: always allow dma
> mask <= physiscal memory size") and realised we do need ZONE_DMA32 for
> LittleSur.  Hence this v3, adding a third (second in the series) change
> for LittleSur.
> 
> Also hopefully I'll have sorted out issues with threading in my MUA with
> this series update.
> 
> Please apply.
> 
> Maciej

Series applied to mips-next.

Thanks,
    Paul

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