linux-kernel - Re: [PATCH 10/29] drivers: add DRIVER_HAS_OWN_IOMMU

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Message-id: <54040298.9020002@samsung.com>
Date:	Mon, 01 Sep 2014 07:22:32 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	iommu@...ts.linux-foundation.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	linaro-mm-sig@...ts.linaro.org, Arnd Bergmann <arnd@...db.de>,
	Shaik Ameer Basha <shaik.ameer@...sung.com>,
	Cho KyongHo <pullip.cho@...sung.com>,
	Joerg Roedel <joro@...tes.org>,
	Thierry Reding <treding@...dia.com>,
	Olof Johansson <olof@...om.net>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Rob Herring <robh@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Inki Dae <inki.dae@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH 10/29] drivers: add DRIVER_HAS_OWN_IOMMU_MANAGER flag

Hi Greg,

On 2014-08-05 12:47, Marek Szyprowski wrote:
> This patch adds a new flags for device drivers. This flag instructs
> kernel that the device driver does it own management of IOMMU assisted
> IO address space translations, so no default dma-mapping structures
> should be initialized.
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>   include/linux/device.h | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 5f4ff02..2e62371 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -253,6 +253,8 @@ struct device_driver {
>   
>   /* disables bind/unbind via sysfs */
>   #define DRIVER_SUPPRESS_BIND_ATTRS	(1 << 0)
> +/* driver uses own methods to manage IO address space */
> +#define DRIVER_HAS_OWN_IOMMU_MANAGER	(1 << 1)
>   
>   extern int __must_check driver_register(struct device_driver *drv);
>   extern void driver_unregister(struct device_driver *drv);

Could you comment if the approach of using flags in the struct driver
could be accepted? I've converted suppress_bind_attrs entry to flags to
avoid extending the structure, please see patch "[PATCH 05/29] drivers:
convert suppress_bind_attrs parameter into flags".

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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