linux-kernel - Re: [PATCH V9 1/4] dma-mapping: Rework dma_get_cache

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Date:   Tue, 24 Oct 2017 12:11:56 -0700
From:   Mark Greer <mgreer@...malcreek.com>
To:     Huacai Chen <chenhc@...ote.com>
Cc:     Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fuxin Zhang <zhangfx@...ote.com>, linux-kernel@...r.kernel.org,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <james.hogan@...tec.com>,
        linux-mips@...ux-mips.org,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, stable@...r.kernel.org,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Pawel Osciak <pawel@...iak.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Ivan Mikhaylov <ivan@...ibm.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Andy Gross <agross@...eaurora.org>,
        "Mark A . Greer" <mgreer@...malcreek.com>,
        Robert Baldyga <r.baldyga@...kerion.com>
Subject: Re: [PATCH V9 1/4] dma-mapping: Rework dma_get_cache_alignment()

On Mon, Oct 23, 2017 at 03:12:44PM +0800, Huacai Chen wrote:
> Make dma_get_cache_alignment() to accept a 'dev' argument. As a result,
> it can return different alignments due to different devices' I/O cache
> coherency.
> 
> Currently, ARM/ARM64 and MIPS support coherent & noncoherent devices
> co-exist. This may be extended in the future, so add a new function
> pointer (i.e, get_cache_alignment) in 'struct dma_map_ops' as a generic
> solution.
> 
> Cc: stable@...r.kernel.org
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Cc: Pawel Osciak <pawel@...iak.com>
> Cc: Marek Szyprowski <m.szyprowski@...sung.com>
> Cc: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Michael Chan <michael.chan@...adcom.com>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Ivan Mikhaylov <ivan@...ibm.com>
> Cc: Tariq Toukan <tariqt@...lanox.com>
> Cc: Andy Gross <agross@...eaurora.org>
> Cc: Mark A. Greer <mgreer@...malcreek.com>
> Cc: Robert Baldyga <r.baldyga@...kerion.com>
> Cc: Marek Szyprowski <m.szyprowski@...sung.com>
> Signed-off-by: Huacai Chen <chenhc@...ote.com>
> ---

For the mpsc stuff:

Acked-by: Mark Greer <mgreer@...malcreek.com>