From: Arjan van de Ven <arjan@linux.intel.com>
To: David Miller <davem@davemloft.net>
Cc: hch@infradead.org, ashok.raj@intel.com,
linux-kernel@vger.kernel.org, akpm@osdl.org, ak@suse.de,
gregkh@suse.de, muli@il.ibm.com, asit.k.mallick@intel.com,
suresh.b.siddha@intel.com, anil.s.keshavamurthy@intel.com,
shaohua.li@intel.com
Subject: Re: [patch 5/8] [Intel IOMMU] Graphics driver workarounds to provide unity map
Date: Tue, 10 Apr 2007 09:29:26 -0700 [thread overview]
Message-ID: <461BBB66.4010303@linux.intel.com> (raw)
In-Reply-To: <20070410.020702.88477115.davem@davemloft.net>
David Miller wrote:
> From: Christoph Hellwig <hch@infradead.org>
> Date: Tue, 10 Apr 2007 09:33:51 +0100
>
>> On Mon, Apr 09, 2007 at 02:55:57PM -0700, Ashok Raj wrote:
>>> Most GFX drivers don't call standard PCI DMA APIs to allocate DMA buffer,
>>> Such drivers will be broken with IOMMU enabled. To workaround this issue,
>>> we added two options.
>> All drm drivers do it. If the usual out of tree crap vendors are too
>> stupid for their own sake it's their fault.
>>
>> So NACK to this patch.
>
> That's my feeling as well, everything we care about should be using
> the proper APIs or else what is the point of them...
that's too simple; X uses /dev/mem as well, even with something as
open as the Intel drivers.
Sad but true ;(
(it's getting resolved on the X side but existing X is like this)
next prev parent reply other threads:[~2007-04-10 16:30 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-09 21:55 [patch 0/8] [Intel IOMMU] Support for Intel Virtualization Technology for Directed I/O Ashok Raj
2007-04-09 21:55 ` [patch 1/8] [Intel IOMMU] ACPI support " Ashok Raj
2007-04-10 3:39 ` Len Brown
2007-04-10 16:26 ` Ashok Raj
2007-04-09 21:55 ` [patch 2/8] [Intel IOMMU] Some generic search functions required to lookup device relationships Ashok Raj
2007-04-10 3:46 ` Greg KH
2007-04-10 8:11 ` Shaohua Li
2007-04-10 13:03 ` Greg KH
2007-04-11 1:40 ` Shaohua Li
2007-04-11 4:36 ` Greg KH
2007-04-11 6:10 ` Shaohua Li
2007-04-09 21:55 ` [patch 3/8] [Intel IOMMU] Generic hardware support for Intel IOMMU Ashok Raj
2007-04-09 21:55 ` [patch 4/8] [Intel IOMMU] Supporting Zero Length Reads in " Ashok Raj
2007-04-09 21:55 ` [patch 5/8] [Intel IOMMU] Graphics driver workarounds to provide unity map Ashok Raj
2007-04-10 8:33 ` Christoph Hellwig
2007-04-10 9:07 ` David Miller
2007-04-10 9:12 ` Andi Kleen
2007-04-11 2:40 ` Wang Zhenyu
2007-04-10 16:29 ` Arjan van de Ven [this message]
2007-04-09 21:55 ` [patch 6/8] [Intel IOMMU] Doc updates for Intel Virtualization Technology for Directed I/O Ashok Raj
2007-04-09 21:55 ` [patch 7/8] [Intel IOMMU] Support for legacy ISA devices Ashok Raj
2007-04-09 21:56 ` [patch 8/8] [Intel IOMMU] Preserve some Virtual Address when devices cannot address entire range Ashok Raj
2007-04-10 7:49 ` [patch 0/8] [Intel IOMMU] Support for Intel Virtualization Technology for Directed I/O Andi Kleen
2007-04-10 7:57 ` Shaohua Li
2007-04-10 8:09 ` Muli Ben-Yehuda
2007-04-10 8:20 ` Shaohua Li
2007-04-10 16:31 ` Ashok Raj
2007-04-10 8:21 ` Jeff Garzik
2007-04-10 8:27 ` Shaohua Li
2007-04-10 8:34 ` Jeff Garzik
2007-04-10 16:43 ` Ashok Raj
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