From: Ashok Raj <ashok.raj@intel.com>
To: Jeff Garzik <jeff@garzik.org>
Cc: Shaohua Li <shaohua.li@intel.com>,
Ashok Raj <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,
arjan@linux.intel.com,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [patch 0/8] [Intel IOMMU] Support for Intel Virtualization Technology for Directed I/O
Date: Tue, 10 Apr 2007 09:43:26 -0700 [thread overview]
Message-ID: <20070410164325.GD31505@linux-os.sc.intel.com> (raw)
In-Reply-To: <461B4C28.4010806@garzik.org>
On Tue, Apr 10, 2007 at 04:34:48AM -0400, Jeff Garzik wrote:
> Shaohua Li wrote:
> >DMA remapping just uses ACPI table to tell which dma remapping engine a
> >pci device is controlled by at boot time. At run time, DMA remapping
> >hasn't any interactive with ACPI.
>
> The Linux kernel _really_ wants a non-ACPI way to detect this.
>
> Just use the hardware registers themselves, you don't need an ACPI table.
>
> Jeff
ACPI is required just not for identifying the DMA remapping hardware in the
system. We also need them to identify which engines control which pci devices.
Also there are some reserved sections that BIOS uses for its purpose that it
needs identity map.. say for legacy emulation via usb etc that needs
to be passed to the OS.
not sure we can get away from using ACPI that easily.. its just only for setup
information, once the identification is complete we dont bother ACPI anymore.
prev parent reply other threads:[~2007-04-10 16:45 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
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 [this message]
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