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From: Christoph Hellwig <hch@infradead.org>
To: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Cc: Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Artemi Ivanov <artemi.ivanov@cogentembedded.com>
Subject: Re: blk_queue_bounce_limit() broken for mask=0xffffffff on 64bit archs
Date: Mon, 9 Jan 2017 12:59:59 -0800	[thread overview]
Message-ID: <20170109205959.GA1112@infradead.org> (raw)
In-Reply-To: <632ad7f3-e837-a17c-5ba7-ed9800ba3ec0@cogentembedded.com>

On Mon, Jan 09, 2017 at 11:48:11PM +0300, Nikita Yushchenko wrote:
> Hi
> 
> There is a use cases when architecture is 64-bit but hardware supports
> only DMA to lower 4G of address space. E.g. NVMe device on RCar PCIe host.

The solution is to shoot the SOC designer.  If that doesn't work use
swiotlb.

  reply	other threads:[~2017-01-09 21:00 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-09 20:48 blk_queue_bounce_limit() broken for mask=0xffffffff on 64bit archs Nikita Yushchenko
2017-01-09 20:59 ` Christoph Hellwig [this message]
2017-01-13  6:07 ` Ming Lei
2017-01-13  6:10   ` Nikita Yushchenko

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