linux-kernel - RE: [PATCH] iommu/exynos: add devices attached to the System MMU to an IOMMU group

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Date:	Tue, 23 Jul 2013 12:46:27 +0000
From:	Sethi Varun-B16395 <B16395@...escale.com>
To:	Antonios Motakis <a.motakis@...tualopensystems.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>
CC:	Sachin Kamat <sachin.kamat@...aro.org>,
	Jiri Kosina <jkosina@...e.cz>,
	open list <linux-kernel@...r.kernel.org>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	Cho KyongHo <pullip.cho@...sung.com>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>
Subject: RE: [PATCH] iommu/exynos: add devices attached to the System MMU to
 an	IOMMU group



> -----Original Message-----
> From: iommu-bounces@...ts.linux-foundation.org [mailto:iommu-
> bounces@...ts.linux-foundation.org] On Behalf Of Antonios Motakis
> Sent: Tuesday, July 23, 2013 3:32 PM
> To: linux-arm-kernel@...ts.infradead.org; iommu@...ts.linux-
> foundation.org; linux-samsung-soc@...r.kernel.org
> Cc: Sachin Kamat; Jiri Kosina; open list; Wei Yongjun; Antonios Motakis;
> Cho KyongHo; kvmarm@...ts.cs.columbia.edu
> Subject: [PATCH] iommu/exynos: add devices attached to the System MMU to
> an IOMMU group
> 
> IOMMU groups are expected by certain users of the IOMMU API, e.g. VFIO.
> Since each device is behind its own System MMU, we can allocate a new
> IOMMU group for each device.
> 
> This patch depends on Cho KyongHo's patch series titled "[PATCH v7 00/12]
> iommu/exynos: Fixes and Enhancements of System MMU driver with DT",
> applied on a Linux 3.10.1 kernel. It has been tested on the Arndale
> board.
> 
> Signed-off-by: Antonios Motakis <a.motakis@...tualopensystems.com>
> ---
>  drivers/iommu/exynos-iommu.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
> index 51d43bb..9f39eaa 100644
> --- a/drivers/iommu/exynos-iommu.c
> +++ b/drivers/iommu/exynos-iommu.c
> @@ -1134,6 +1134,28 @@ static phys_addr_t
> exynos_iommu_iova_to_phys(struct iommu_domain *domain,
>  	return phys;
>  }
> 
> +static int exynos_iommu_add_device(struct device *dev) {
> +	struct iommu_group *group;
> +	int ret;
> +
> +	group = iommu_group_alloc();
> +	if (IS_ERR(group)) {
> +		dev_err(dev, "Failed to allocate IOMMU group\n");
> +		return PTR_ERR(group);
> +	}
> +
> +	ret = iommu_group_add_device(group, dev);
> +	iommu_group_put(group);
> +
> +	return ret;
> +}
> +
> +static void exynos_iommu_remove_device(struct device *dev) {
> +	iommu_group_remove_device(dev);
> +}
> +
>  static struct iommu_ops exynos_iommu_ops = {
>  	.domain_init = &exynos_iommu_domain_init,
>  	.domain_destroy = &exynos_iommu_domain_destroy, @@ -1142,6 +1164,8
> @@ static struct iommu_ops exynos_iommu_ops = {
>  	.map = &exynos_iommu_map,
>  	.unmap = &exynos_iommu_unmap,
>  	.iova_to_phys = &exynos_iommu_iova_to_phys,
> +	.add_device	= exynos_iommu_add_device,
> +	.remove_device	= exynos_iommu_remove_device,
>  	.pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE,  };
> 
[Sethi Varun-B16395] Do you support PCI devices? This assumption of one iommu group per pci device may not hold true in case of PCI devices.

-Varun

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