linux-kernel - Re: [PATCH 1/2] drivers: Move iommu/ before gpu/ in Makefile

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Date:	Tue, 23 Dec 2014 14:09:07 +0200
From:	Oded Gabbay <oded.gabbay@....com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	David Airlie <airlied@...ux.ie>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Dana Elifaz <Dana.Elifaz@....com>,
	<linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
	Alexander Deucher <Alexander.Deucher@....com>,
	<iommu@...ts.linux-foundation.org>,
	Christian König <christian.koenig@....com>
Subject: Re: [PATCH 1/2] drivers: Move iommu/ before gpu/ in Makefile

Hello Linus,
Dave Airlie asked me to send this patch to you for review.
See link below for cover-letter for this patch that explains the background a 
bit more:
http://lists.freedesktop.org/archives/dri-devel/2014-December/074452.html

Thanks,
	Oded


On 12/22/2014 01:07 PM, Oded Gabbay wrote:
> AMD GPU devices are dependent on AMD IOMMU controller functionality to allow
> the GPU to access a process's virtual memory address space, without the need
> for pinning the memory.
>
> This patch changes the order in the drivers makefile, so iommu/ subsystem is
> linked before gpu/ subsystem. That way, if the gpu and iommu drivers are
> compiled inside the kernel image (not as modules), the correct order of device
> loading is still maintained (iommu module is loaded before gpu module).
>
> Signed-off-by: Oded Gabbay <oded.gabbay@....com>
> ---
>   drivers/Makefile | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/Makefile b/drivers/Makefile
> index ebee555..106200f 100644
> --- a/drivers/Makefile
> +++ b/drivers/Makefile
> @@ -50,7 +50,10 @@ obj-$(CONFIG_RESET_CONTROLLER)	+= reset/
>   obj-y				+= tty/
>   obj-y				+= char/
>
> -# gpu/ comes after char for AGP vs DRM startup
> +# iommu/ comes before gpu as gpu are using iommu controllers
> +obj-$(CONFIG_IOMMU_SUPPORT)	+= iommu/
> +
> +# gpu/ comes after char for AGP vs DRM startup and after iommu
>   obj-y				+= gpu/
>
>   obj-$(CONFIG_CONNECTOR)		+= connector/
> @@ -141,7 +144,6 @@ obj-y				+= clk/
>
>   obj-$(CONFIG_MAILBOX)		+= mailbox/
>   obj-$(CONFIG_HWSPINLOCK)	+= hwspinlock/
> -obj-$(CONFIG_IOMMU_SUPPORT)	+= iommu/
>   obj-$(CONFIG_REMOTEPROC)	+= remoteproc/
>   obj-$(CONFIG_RPMSG)		+= rpmsg/
>
>
--
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