From: Darren Hart <dvhart@infradead.org>
To: Christoph Hellwig <hch@lst.de>
Cc: stuart.w.hayes@gmail.com, andy@infradead.org,
platform-driver-x86@vger.kernel.org,
linux-kernel@vger.kernel.org, Mario_Limonciello@Dell.com
Subject: Re: [PATCH] dell_rbu: stop abusing the DMA API
Date: Fri, 1 Feb 2019 15:15:59 -0800 [thread overview]
Message-ID: <20190201231559.GC105752@fedora.eng.vmware.com> (raw)
In-Reply-To: <20190129073409.7247-1-hch@lst.de>
On Tue, Jan 29, 2019 at 08:34:09AM +0100, Christoph Hellwig wrote:
> For some odd reason dell_rbu actually seems to want the physical and
> not a bus address for the allocated buffer. Lets assume that actually
> is correct given that it is BIOS-related and that is a good source
> of insanity. In that case we should not use dma_alloc_coherent with
> a NULL device to allocate memory, but use GFP_DMA32 to stay under
> the 32-bit BIOS limit.
+ Mario re bios related physical address - is Christoph's assumption
correct?
Christoph, did you observe a failure? If so, we should probably also
tag for stable.
--
Darren Hart
VMware Open Source Technology Center
next prev parent reply other threads:[~2019-02-01 23:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-29 7:34 Christoph Hellwig
2019-02-01 18:28 ` Stuart Hayes
2019-02-01 23:17 ` Darren Hart
2019-02-01 23:15 ` Darren Hart [this message]
2019-02-02 17:16 ` Christoph Hellwig
2019-02-07 20:47 ` Darren Hart
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