From: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
To: Auger Eric <eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: drjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org,
kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
marc.zyngier-5wv7dgnIgG8@public.gmane.org,
punit.agrawal-5wv7dgnIgG8@public.gmane.org,
will.deacon-5wv7dgnIgG8@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
pranav.sawargaonkar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org,
christoffer.dall-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
eric.auger.pro-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Subject: Re: [RFC v2 8/8] iommu/arm-smmu: implement add_reserved_regions callback
Date: Mon, 14 Nov 2016 17:20:37 +0100 [thread overview]
Message-ID: <20161114162037.GC14829@8bytes.org> (raw)
In-Reply-To: <295feefe-014b-5669-7f5a-e04b09ba3454-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
On Mon, Nov 14, 2016 at 05:08:16PM +0100, Auger Eric wrote:
> There are potentially several MSI doorbell physical pages in the SOC
> that are accessed through the IOMMU (translated). Each of those must
> have a corresponding IOVA and IOVA/PA mapping programmed in the IOMMU.
> Else MSI will fault.
>
> - step 1 was to define a usable IOVA range for MSI mapping. So now we
> decided the base address and size would be hardcoded for ARM. The
> get_dm_region can be used to retrieve that hardcoded region.
> - Step2 is to allocate IOVAs within that range and map then for each of
> those MSI doorbells. This is done in the MSI controller compose() callback.
>
> I hope I succeeded in clarifying this time.
>
> Robin sent today a new version of its cookie think using a dummy
> allocator. I am currently integrating it.
Okay, I understand. A simple bitmap-allocator would probably be
sufficient, and doesn't have the overhead the iova allocator has. About
how many pages are we talking here?
Joerg
WARNING: multiple messages have this Message-ID (diff)
From: joro@8bytes.org (Joerg Roedel)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC v2 8/8] iommu/arm-smmu: implement add_reserved_regions callback
Date: Mon, 14 Nov 2016 17:20:37 +0100 [thread overview]
Message-ID: <20161114162037.GC14829@8bytes.org> (raw)
In-Reply-To: <295feefe-014b-5669-7f5a-e04b09ba3454@redhat.com>
On Mon, Nov 14, 2016 at 05:08:16PM +0100, Auger Eric wrote:
> There are potentially several MSI doorbell physical pages in the SOC
> that are accessed through the IOMMU (translated). Each of those must
> have a corresponding IOVA and IOVA/PA mapping programmed in the IOMMU.
> Else MSI will fault.
>
> - step 1 was to define a usable IOVA range for MSI mapping. So now we
> decided the base address and size would be hardcoded for ARM. The
> get_dm_region can be used to retrieve that hardcoded region.
> - Step2 is to allocate IOVAs within that range and map then for each of
> those MSI doorbells. This is done in the MSI controller compose() callback.
>
> I hope I succeeded in clarifying this time.
>
> Robin sent today a new version of its cookie think using a dummy
> allocator. I am currently integrating it.
Okay, I understand. A simple bitmap-allocator would probably be
sufficient, and doesn't have the overhead the iova allocator has. About
how many pages are we talking here?
Joerg
WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <joro@8bytes.org>
To: Auger Eric <eric.auger@redhat.com>
Cc: drjones@redhat.com, alex.williamson@redhat.com,
jason@lakedaemon.net, kvm@vger.kernel.org, marc.zyngier@arm.com,
punit.agrawal@arm.com, will.deacon@arm.com,
linux-kernel@vger.kernel.org, diana.craciun@nxp.com,
iommu@lists.linux-foundation.org, pranav.sawargaonkar@gmail.com,
christoffer.dall@linaro.org, tglx@linutronix.de,
robin.murphy@arm.com, linux-arm-kernel@lists.infradead.org,
eric.auger.pro@gmail.com
Subject: Re: [RFC v2 8/8] iommu/arm-smmu: implement add_reserved_regions callback
Date: Mon, 14 Nov 2016 17:20:37 +0100 [thread overview]
Message-ID: <20161114162037.GC14829@8bytes.org> (raw)
In-Reply-To: <295feefe-014b-5669-7f5a-e04b09ba3454@redhat.com>
On Mon, Nov 14, 2016 at 05:08:16PM +0100, Auger Eric wrote:
> There are potentially several MSI doorbell physical pages in the SOC
> that are accessed through the IOMMU (translated). Each of those must
> have a corresponding IOVA and IOVA/PA mapping programmed in the IOMMU.
> Else MSI will fault.
>
> - step 1 was to define a usable IOVA range for MSI mapping. So now we
> decided the base address and size would be hardcoded for ARM. The
> get_dm_region can be used to retrieve that hardcoded region.
> - Step2 is to allocate IOVAs within that range and map then for each of
> those MSI doorbells. This is done in the MSI controller compose() callback.
>
> I hope I succeeded in clarifying this time.
>
> Robin sent today a new version of its cookie think using a dummy
> allocator. I am currently integrating it.
Okay, I understand. A simple bitmap-allocator would probably be
sufficient, and doesn't have the overhead the iova allocator has. About
how many pages are we talking here?
Joerg
next prev parent reply other threads:[~2016-11-14 16:20 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-04 11:23 [RFC v2 0/8] KVM PCIe/MSI passthrough on ARM/ARM64 - Alt II Eric Auger
2016-11-04 11:23 ` Eric Auger
2016-11-04 11:23 ` Eric Auger
2016-11-04 11:24 ` [RFC v2 3/8] iommu/dma: Allow MSI-only cookies Eric Auger
[not found] ` <1478258646-3117-4-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-11-14 12:36 ` Robin Murphy
2016-11-14 12:36 ` Robin Murphy
2016-11-14 12:36 ` Robin Murphy
[not found] ` <5f93ebfd-edf4-0b5a-b54a-b96937a588b8-5wv7dgnIgG8@public.gmane.org>
2016-11-14 23:23 ` Auger Eric
2016-11-14 23:23 ` Auger Eric
2016-11-14 23:23 ` Auger Eric
2016-11-15 14:52 ` Robin Murphy
2016-11-15 14:52 ` Robin Murphy
2016-11-04 11:24 ` [RFC v2 6/8] iommu: Handle the list of reserved regions Eric Auger
[not found] ` <1478258646-3117-1-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-11-04 11:23 ` [RFC v2 1/8] vfio: fix vfio_info_cap_add/shift Eric Auger
2016-11-04 11:23 ` Eric Auger
2016-11-04 11:24 ` [RFC v2 2/8] iommu/iova: fix __alloc_and_insert_iova_range Eric Auger
2016-11-04 11:24 ` Eric Auger
[not found] ` <1478258646-3117-3-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-11-10 15:22 ` Joerg Roedel
2016-11-10 15:22 ` Joerg Roedel
2016-11-10 15:22 ` Joerg Roedel
2016-11-10 15:41 ` Auger Eric
2016-11-10 15:41 ` Auger Eric
2016-11-04 11:24 ` [RFC v2 4/8] iommu: Add a list of iommu_reserved_region in iommu_domain Eric Auger
2016-11-04 11:24 ` Eric Auger
[not found] ` <1478258646-3117-5-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-11-04 14:00 ` Robin Murphy
2016-11-04 14:00 ` Robin Murphy
2016-11-04 14:00 ` Robin Murphy
2016-11-10 11:22 ` Auger Eric
2016-11-10 11:22 ` Auger Eric
2016-11-10 11:54 ` Robin Murphy
2016-11-10 11:54 ` Robin Murphy
2016-11-10 12:14 ` Auger Eric
2016-11-10 12:14 ` Auger Eric
[not found] ` <6c2e1c81-e951-a284-b547-733369128e7e-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-11-10 12:48 ` Robin Murphy
2016-11-10 12:48 ` Robin Murphy
2016-11-10 12:48 ` Robin Murphy
2016-11-10 15:37 ` Joerg Roedel
2016-11-10 15:37 ` Joerg Roedel
2016-11-10 15:37 ` Joerg Roedel
2016-11-10 15:42 ` Auger Eric
2016-11-10 15:42 ` Auger Eric
2016-11-04 11:24 ` [RFC v2 5/8] vfio/type1: Introduce RESV_IOVA_RANGE capability Eric Auger
2016-11-04 11:24 ` Eric Auger
2016-11-04 11:24 ` [RFC v2 7/8] iommu/vt-d: Implement add_reserved_regions callback Eric Auger
2016-11-04 11:24 ` Eric Auger
2016-11-04 11:24 ` [RFC v2 8/8] iommu/arm-smmu: implement " Eric Auger
2016-11-04 11:24 ` Eric Auger
2016-11-04 14:16 ` Robin Murphy
2016-11-04 14:16 ` Robin Murphy
[not found] ` <1478258646-3117-9-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-11-10 15:46 ` Joerg Roedel
2016-11-10 15:46 ` Joerg Roedel
2016-11-10 15:46 ` Joerg Roedel
[not found] ` <20161110154606.GH2078-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2016-11-10 15:57 ` Auger Eric
2016-11-10 15:57 ` Auger Eric
2016-11-10 15:57 ` Auger Eric
2016-11-10 16:13 ` Joerg Roedel
2016-11-10 16:13 ` Joerg Roedel
[not found] ` <20161110161331.GJ2078-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2016-11-10 18:00 ` Auger Eric
2016-11-10 18:00 ` Auger Eric
2016-11-10 18:00 ` Auger Eric
[not found] ` <f4537e43-0237-e478-eacd-b107458628b8-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-11-11 11:42 ` Joerg Roedel
2016-11-11 11:42 ` Joerg Roedel
2016-11-11 11:42 ` Joerg Roedel
2016-11-11 15:47 ` Auger Eric
2016-11-11 15:47 ` Auger Eric
2016-11-11 16:22 ` Joerg Roedel
2016-11-11 16:22 ` Joerg Roedel
[not found] ` <20161111162211.GU2078-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2016-11-11 16:45 ` Auger Eric
2016-11-11 16:45 ` Auger Eric
2016-11-11 16:45 ` Auger Eric
2016-11-14 15:31 ` Joerg Roedel
2016-11-14 15:31 ` Joerg Roedel
2016-11-14 16:08 ` Auger Eric
2016-11-14 16:08 ` Auger Eric
[not found] ` <295feefe-014b-5669-7f5a-e04b09ba3454-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-11-14 16:20 ` Joerg Roedel [this message]
2016-11-14 16:20 ` Joerg Roedel
2016-11-14 16:20 ` Joerg Roedel
2016-11-14 16:57 ` Auger Eric
2016-11-14 16:57 ` Auger Eric
2016-11-10 16:07 ` Robin Murphy
2016-11-10 16:07 ` Robin Murphy
2016-11-10 16:07 ` Robin Murphy
[not found] ` <b347ddbc-5066-641c-8101-289fb28624a3-5wv7dgnIgG8@public.gmane.org>
2016-11-10 16:16 ` Joerg Roedel
2016-11-10 16:16 ` Joerg Roedel
2016-11-10 16:16 ` Joerg Roedel
[not found] ` <20161110161619.GK2078-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2016-11-11 14:34 ` Robin Murphy
2016-11-11 14:34 ` Robin Murphy
2016-11-11 14:34 ` Robin Murphy
[not found] ` <479aeac0-71f9-a6b8-af6d-e2c25184a818-5wv7dgnIgG8@public.gmane.org>
2016-11-11 15:03 ` Joerg Roedel
2016-11-11 15:03 ` Joerg Roedel
2016-11-11 15:03 ` Joerg Roedel
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