From: Bjorn Helgaas <bhelgaas@google.com>
To: Bhushan Bharat-R65777 <R65777@freescale.com>
Cc: "alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"joro@8bytes.org" <joro@8bytes.org>,
"benh@kernel.crashing.org" <benh@kernel.crashing.org>,
"galak@kernel.crashing.org" <galak@kernel.crashing.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"agraf@suse.de" <agraf@suse.de>,
Wood Scott-B07421 <B07421@freescale.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>
Subject: Re: [PATCH 1/7] powerpc: Add interface to get msi region information
Date: Tue, 8 Oct 2013 10:47:49 -0600 [thread overview]
Message-ID: <CAErSpo742BOxzxRaFQn+UnsNday4_8LM6+3G6=cfp9DHecPxDg@mail.gmail.com> (raw)
In-Reply-To: <6A3DF150A5B70D4F9B66A25E3F7C888D0718FA58@039-SN2MPN1-011.039d.mgd.msft.net>
On Thu, Oct 3, 2013 at 11:19 PM, Bhushan Bharat-R65777
<R65777@freescale.com> wrote:
>> I don't know enough about VFIO to understand why these new interfaces are
>> needed. Is this the first VFIO IOMMU driver? I see vfio_iommu_spapr_tce.c and
>> vfio_iommu_type1.c but I don't know if they're comparable to the Freescale PAMU.
>> Do other VFIO IOMMU implementations support MSI? If so, do they handle the
>> problem of mapping the MSI regions in a different way?
>
> PAMU is an aperture type of IOMMU while other are paging type, So they are completely different from what PAMU is and handle that differently.
This is not an explanation or a justification for adding new
interfaces. I still have no idea what an "aperture type IOMMU" is,
other than that it is "different." But I see that Alex is working on
this issue with you in a different thread, so I'm sure you guys will
sort it out.
Bjorn
next prev parent reply other threads:[~2013-10-08 16:47 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-19 7:29 [PATCH 0/7] vfio-pci: add support for Freescale IOMMU (PAMU) Bharat Bhushan
2013-09-19 7:29 ` [PATCH 1/7] powerpc: Add interface to get msi region information Bharat Bhushan
2013-09-24 23:58 ` Bjorn Helgaas
[not found] ` <20130924235812.GD9302-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2013-10-04 5:19 ` Bhushan Bharat-R65777
2013-10-08 16:47 ` Bjorn Helgaas [this message]
2013-10-08 17:02 ` joro
[not found] ` <20131008170228.GD17455-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2013-10-08 17:09 ` Bhushan Bharat-R65777
2013-10-10 21:13 ` Sethi Varun-B16395
[not found] ` <CAErSpo742BOxzxRaFQn+UnsNday4_8LM6+3G6=cfp9DHecPxDg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-10-08 17:09 ` Scott Wood
2013-10-08 22:57 ` Scott Wood
[not found] ` <1381273037.7979.298.camel-88ow+0ZRuxG2UiBs7uKeOtHuzzzSOjJt@public.gmane.org>
2013-10-08 23:25 ` Bjorn Helgaas
[not found] ` <CAErSpo7+7SHVcOJkHkW5cjb6pN+bqYeRdPBA=MVX0RLz=-pP6Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-10-08 23:35 ` Scott Wood
2013-10-09 4:47 ` Bhushan Bharat-R65777
[not found] ` <1379575763-2091-1-git-send-email-Bharat.Bhushan-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
2013-09-19 7:29 ` [PATCH 2/7] iommu: add api to get iommu_domain of a device Bharat Bhushan
[not found] ` <1379575763-2091-3-git-send-email-Bharat.Bhushan-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
2013-09-25 16:45 ` Alex Williamson
2013-10-04 9:54 ` Bhushan Bharat-R65777
[not found] ` <6A3DF150A5B70D4F9B66A25E3F7C888D0718FD1C-RL0Hj/+nBVCMXPU/2EZmt64g8xLGJsHaLnY5E4hWTkheoWH0uzbU5w@public.gmane.org>
2013-10-04 15:45 ` Alex Williamson
[not found] ` <1380901507.2673.204.camel-85EaTFmN5p//9pzu0YdTqQ@public.gmane.org>
2013-10-04 16:47 ` Bhushan Bharat-R65777
[not found] ` <6A3DF150A5B70D4F9B66A25E3F7C888D07190F35-RL0Hj/+nBVCMXPU/2EZmt64g8xLGJsHaLnY5E4hWTkheoWH0uzbU5w@public.gmane.org>
2013-10-04 17:12 ` Alex Williamson
2013-10-04 17:23 ` Bhushan Bharat-R65777
[not found] ` <6A3DF150A5B70D4F9B66A25E3F7C888D07191143-RL0Hj/+nBVCMXPU/2EZmt64g8xLGJsHaLnY5E4hWTkheoWH0uzbU5w@public.gmane.org>
2013-10-04 18:12 ` Alex Williamson
[not found] ` <1380910322.25705.56.camel-85EaTFmN5p//9pzu0YdTqQ@public.gmane.org>
2013-10-07 5:46 ` Bhushan Bharat-R65777
[not found] ` <6A3DF150A5B70D4F9B66A25E3F7C888D0719385B-RL0Hj/+nBVCMXPU/2EZmt64g8xLGJsHaLnY5E4hWTkheoWH0uzbU5w@public.gmane.org>
2013-10-08 3:13 ` Alex Williamson
2013-10-08 3:42 ` Bhushan Bharat-R65777
[not found] ` <1381201980.6330.4.camel-85EaTFmN5p//9pzu0YdTqQ@public.gmane.org>
2013-10-10 20:09 ` Sethi Varun-B16395
[not found] ` <C5ECD7A89D1DC44195F34B25E172658D0A52BAC7-RL0Hj/+nBVDYdknt8GnhQq4g8xLGJsHaLnY5E4hWTkheoWH0uzbU5w@public.gmane.org>
2013-10-10 20:41 ` Alex Williamson
2013-10-14 12:58 ` Sethi Varun-B16395
[not found] ` <C5ECD7A89D1DC44195F34B25E172658D0A535437-RL0Hj/+nBVDYdknt8GnhQq4g8xLGJsHaLnY5E4hWTkheoWH0uzbU5w@public.gmane.org>
2013-10-14 14:20 ` Alex Williamson
2013-10-04 10:42 ` Bhushan Bharat-R65777
2013-09-19 7:29 ` [PATCH 3/7] fsl iommu: add get_dev_iommu_domain Bharat Bhushan
2013-09-19 7:29 ` [PATCH 4/7] powerpc: translate msi addr to iova if iommu is in use Bharat Bhushan
2013-09-19 7:29 ` [PATCH 5/7] iommu: supress loff_t compilation error on powerpc Bharat Bhushan
[not found] ` <1379575763-2091-6-git-send-email-Bharat.Bhushan-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
2013-09-25 16:40 ` Alex Williamson
2013-09-26 3:53 ` Bhushan Bharat-R65777
[not found] ` <6A3DF150A5B70D4F9B66A25E3F7C888D07183CA4-RL0Hj/+nBVCMXPU/2EZmt64g8xLGJsHaLnY5E4hWTkheoWH0uzbU5w@public.gmane.org>
2013-09-26 22:20 ` Scott Wood
2013-09-19 7:29 ` [PATCH 6/7] vfio: moving some functions in common file Bharat Bhushan
[not found] ` <1379575763-2091-7-git-send-email-Bharat.Bhushan-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
2013-09-25 17:02 ` Alex Williamson
2013-09-26 3:57 ` Bhushan Bharat-R65777
2013-09-19 7:29 ` [PATCH 7/7] vfio pci: Add vfio iommu implementation for FSL_PAMU Bharat Bhushan
[not found] ` <1379575763-2091-8-git-send-email-Bharat.Bhushan-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
2013-09-25 19:06 ` Alex Williamson
2013-09-26 5:27 ` Bhushan Bharat-R65777
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