From: Christoph Hellwig <hch@infradead.org>
To: Michael Chan <mchan@broadcom.com>
Cc: Jeff Garzik <jeff@garzik.org>, David Miller <davem@davemloft.net>,
netdev <netdev@vger.kernel.org>
Subject: Re: [PATCH 3/20][BNX2]: Add 40-bit DMA workaround for 5708.
Date: Wed, 2 May 2007 23:48:58 +0100 [thread overview]
Message-ID: <20070502224858.GA2363@infradead.org> (raw)
In-Reply-To: <1178136161.4820.91.camel@dell>
On Wed, May 02, 2007 at 01:02:41PM -0700, Michael Chan wrote:
> Let's say I have a 32-bit card that cannot do dual address cycle on a
> 64-bit dma_addr_t system without IOMMU. If CONFIG_HIGHMEM is not set,
> wouldn't the device get > 32-bit DMA addresses that it cannot handle?
It needs to set it's dma mask to 32bits and the upper layers (net, block)
will do the bouncing for it.
next prev parent reply other threads:[~2007-05-02 22:49 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-02 1:13 [PATCH 3/20][BNX2]: Add 40-bit DMA workaround for 5708 Michael Chan
2007-05-02 7:06 ` Jeff Garzik
2007-05-02 7:12 ` David Miller
2007-05-02 15:23 ` Michael Chan
2007-05-02 15:28 ` Christoph Hellwig
2007-05-02 15:29 ` Jeff Garzik
2007-05-02 18:23 ` Michael Chan
2007-05-02 18:24 ` Jeff Garzik
2007-05-02 20:02 ` Michael Chan
2007-05-02 20:30 ` Jeff Garzik
2007-05-02 22:48 ` Christoph Hellwig [this message]
2007-05-02 22:50 ` David Miller
2007-05-02 19:40 ` David Miller
2007-05-02 21:27 ` Michael Chan
2007-05-02 21:45 ` David Miller
2007-05-02 23:28 ` Michael Chan
2007-05-02 22:48 ` David Miller
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