From: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
To: Lucas Stach <l.stach-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Cc: Joerg Roedel <jroedel-l3A5Bk7waGM@public.gmane.org>,
David Airlie <airlied-cv59FeDIM0c@public.gmane.org>,
Christian Gmeiner
<christian.gmeiner-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
etnaviv-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
Russell King
<linux+etnaviv-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org>
Subject: Re: [PATCH 06/13] drm/etnaviv: Use sychronized interface of the IOMMU-API
Date: Thu, 17 Aug 2017 16:18:58 +0200 [thread overview]
Message-ID: <20170817141858.GG16908@8bytes.org> (raw)
In-Reply-To: <1502978634.19806.27.camel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
On Thu, Aug 17, 2017 at 04:03:54PM +0200, Lucas Stach wrote:
> There is no IOMMU driver in use. Etnaviv just uses part of the IOMMU API
> to manage the GPU internal MMU, see
> drivers/gpu/drm/etnaviv/etnaviv_iommu.c
That looks like a very fragile construct, because it relies on internal
behavior of the iommu code that can change in the future.
I strongly suggest to either make etnaviv_iommu.c a real iommu driver an
move it to drivers/iommu, or (prefered by me) just call directly into
the map/unmap functions of this driver from the rest of the
etnaviv_iommu.c. I don't really see a reason why the IOMMU-API needs to
be used there as another layer of indirection.
Regards,
Joerg
WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <joro@8bytes.org>
To: Lucas Stach <l.stach@pengutronix.de>
Cc: Joerg Roedel <jroedel@suse.de>,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>,
Russell King <linux+etnaviv@armlinux.org.uk>,
Christian Gmeiner <christian.gmeiner@gmail.com>,
David Airlie <airlied@linux.ie>,
etnaviv@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 06/13] drm/etnaviv: Use sychronized interface of the IOMMU-API
Date: Thu, 17 Aug 2017 16:18:58 +0200 [thread overview]
Message-ID: <20170817141858.GG16908@8bytes.org> (raw)
In-Reply-To: <1502978634.19806.27.camel@pengutronix.de>
On Thu, Aug 17, 2017 at 04:03:54PM +0200, Lucas Stach wrote:
> There is no IOMMU driver in use. Etnaviv just uses part of the IOMMU API
> to manage the GPU internal MMU, see
> drivers/gpu/drm/etnaviv/etnaviv_iommu.c
That looks like a very fragile construct, because it relies on internal
behavior of the iommu code that can change in the future.
I strongly suggest to either make etnaviv_iommu.c a real iommu driver an
move it to drivers/iommu, or (prefered by me) just call directly into
the map/unmap functions of this driver from the rest of the
etnaviv_iommu.c. I don't really see a reason why the IOMMU-API needs to
be used there as another layer of indirection.
Regards,
Joerg
next prev parent reply other threads:[~2017-08-17 14:18 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-17 12:56 [PATCH 00/13] Introduce IOMMU-API TLB Flushing Interface Joerg Roedel
2017-08-17 12:56 ` Joerg Roedel
2017-08-17 12:56 ` [PATCH 07/13] drm/msm: Use sychronized interface of the IOMMU-API Joerg Roedel
2017-08-19 15:39 ` Rob Clark
[not found] ` <1502974596-23835-1-git-send-email-joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2017-08-17 12:56 ` [PATCH 01/13] iommu/amd: Rename a few flush functions Joerg Roedel
2017-08-17 12:56 ` Joerg Roedel
2017-08-17 12:56 ` [PATCH 02/13] iommu: Introduce Interface for IOMMU TLB Flushing Joerg Roedel
2017-08-17 12:56 ` Joerg Roedel
[not found] ` <1502974596-23835-3-git-send-email-joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2017-08-17 16:32 ` Will Deacon
2017-08-17 16:32 ` Will Deacon
[not found] ` <20170817163234.GB30719-5wv7dgnIgG8@public.gmane.org>
2017-08-17 16:50 ` Joerg Roedel
2017-08-17 16:50 ` Joerg Roedel
[not found] ` <20170817165040.GK2853-l3A5Bk7waGM@public.gmane.org>
2017-08-17 17:17 ` Will Deacon
2017-08-17 17:17 ` Will Deacon
2017-08-17 21:20 ` Joerg Roedel
[not found] ` <20170817212054.GL2853-l3A5Bk7waGM@public.gmane.org>
2017-08-18 15:16 ` Will Deacon
2017-08-18 15:16 ` Will Deacon
2017-08-17 12:56 ` [PATCH 03/13] vfio/type1: Use sychronized interface of the IOMMU-API Joerg Roedel
2017-08-17 12:56 ` Joerg Roedel
2017-08-17 12:56 ` [PATCH 04/13] iommu/dma: " Joerg Roedel
2017-08-17 12:56 ` Joerg Roedel
2017-08-17 12:56 ` [PATCH 05/13] arm: dma-mapping: " Joerg Roedel
2017-08-17 12:56 ` Joerg Roedel
2017-08-17 12:56 ` Joerg Roedel
2017-08-17 12:56 ` [PATCH 06/13] drm/etnaviv: " Joerg Roedel
2017-08-17 12:56 ` Joerg Roedel
[not found] ` <1502974596-23835-7-git-send-email-joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2017-08-17 13:32 ` Lucas Stach
2017-08-17 13:32 ` Lucas Stach
[not found] ` <1502976758.19806.25.camel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2017-08-17 13:45 ` Joerg Roedel
2017-08-17 13:45 ` Joerg Roedel
2017-08-17 14:03 ` Lucas Stach
[not found] ` <1502978634.19806.27.camel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2017-08-17 14:18 ` Joerg Roedel [this message]
2017-08-17 14:18 ` Joerg Roedel
[not found] ` <20170817141858.GG16908-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2017-08-17 14:30 ` Lucas Stach
2017-08-17 14:30 ` Lucas Stach
2017-08-17 14:35 ` Joerg Roedel
2017-08-17 12:56 ` [PATCH 08/13] drm/nouveau/imem/gk20a: " Joerg Roedel
2017-08-17 12:56 ` Joerg Roedel
2017-08-17 12:56 ` [PATCH 10/13] drm/tegra: " Joerg Roedel
2017-08-17 12:56 ` Joerg Roedel
2017-08-17 13:28 ` Thierry Reding
2017-08-17 12:56 ` [PATCH 11/13] gpu: host1x: " Joerg Roedel
2017-08-17 12:56 ` Joerg Roedel
[not found] ` <1502974596-23835-12-git-send-email-joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2017-08-17 13:29 ` Thierry Reding
2017-08-17 13:29 ` Thierry Reding
2017-08-17 14:35 ` [PATCH 00/13] Introduce IOMMU-API TLB Flushing Interface Alex Williamson
2017-08-17 14:35 ` Alex Williamson
2017-08-17 14:43 ` Joerg Roedel
[not found] ` <20170817144308.GI16908-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2017-08-17 14:54 ` Alex Williamson
2017-08-17 14:54 ` Alex Williamson
[not found] ` <20170817085407.3de4e755-DGNDKt5SQtizQB+pC5nmwQ@public.gmane.org>
2017-08-17 15:22 ` Joerg Roedel
2017-08-17 15:22 ` Joerg Roedel
[not found] ` <20170817152220.GK16908-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2017-08-23 12:09 ` Joerg Roedel
2017-08-23 12:09 ` Joerg Roedel
2017-08-17 12:56 ` [PATCH 09/13] drm/rockchip: Use sychronized interface of the IOMMU-API Joerg Roedel
2017-08-17 12:56 ` Joerg Roedel
2017-08-17 12:56 ` [PATCH 12/13] IB/usnic: " Joerg Roedel
2017-08-17 12:56 ` [PATCH 13/13] remoteproc: " Joerg Roedel
2017-08-24 19:06 ` Bjorn Andersson
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