linux-kernel - Re: [PATCH v2 7/9] ARM: OMAP: iommu: optimize save and restore routines

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Date:	Tue, 18 Sep 2012 11:04:30 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Omar Ramirez Luna <omar.luna@...aro.org>
Cc:	Benoit Cousson <b-cousson@...com>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Joerg Roedel <joerg.roedel@....com>,
	Russell King <linux@....linux.org.uk>,
	Rajendra Nayak <rnayak@...com>,
	Peter Ujfalusi <peter.ujfalusi@...com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH v2 7/9] ARM: OMAP: iommu: optimize save and restore
 routines

* Omar Ramirez Luna <omar.luna@...aro.org> [120912 12:47]:
> --- a/arch/arm/plat-omap/include/plat/iommu.h
> +++ b/arch/arm/plat-omap/include/plat/iommu.h
> @@ -27,6 +27,13 @@ struct iotlb_entry {
>  	};
>  };
>  
> +/* context registers */
> +struct iommu_regs {
> +	u32 irqen;
> +	u32 cntl;
> +	u32 ttb;
> +};
> +
>  struct omap_iommu {
>  	const char	*name;
>  	struct module	*owner;
> @@ -50,7 +57,8 @@ struct omap_iommu {
>  	struct list_head	mmap;
>  	struct mutex		mmap_lock; /* protect mmap */
>  
> -	void *ctx; /* iommu context: registres saved area */
> +	struct iommu_regs context;
> +	int ctx_loss_cnt;
>  	u32 da_start;
>  	u32 da_end;
>  };
> --- a/arch/arm/plat-omap/include/plat/iommu2.h
> +++ b/arch/arm/plat-omap/include/plat/iommu2.h
> @@ -35,8 +35,6 @@
>  #define MMU_READ_RAM		0x6c
>  #define MMU_EMU_FAULT_AD	0x70
>  
> -#define MMU_REG_SIZE		256
> -
>  /*
>   * MMU Register bit definitions
>   */

These headers should be moved to include/linux/platform_data/iommu-omap.h
or something like that. Care to take care of that too?

I guess there's no reason to have both iommu.h and iommuh2.h?

Regards,

Tony
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