linux-kernel - Re: [PATCH] export iommu_area

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Date:	Mon, 22 Sep 2008 16:08:18 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	mingo@...e.hu, muli@...ibm.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] export iommu_area_reserve helper funciton

On Mon, Sep 22, 2008 at 10:35:07PM +0900, FUJITA Tomonori wrote:
> This is against tip/x86/iommu
> 
> =
> From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> Subject: [PATCH] export iommu_area_reserve helper funciton
> 
> x86 has set_bit_string() that does the exact same thing that
> set_bit_area() in lib/iommu-helper.c does.
> 
> This patch exports set_bit_area() in lib/iommu-helper.c as
> iommu_area_reserve(), converts GART, Calgary, and AMD IOMMU to use it.
> 
> x86's set_bit_string() is used by only the above IOMMUs so this patch
> also removes set_bit_string. We can put it back easily when it
> necessary.
> 
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>

Acked-by: Joerg Roedel <joerg.roedel@....com>

> ---
>  arch/x86/kernel/amd_iommu.c      |    2 +-
>  arch/x86/kernel/pci-calgary_64.c |    2 +-
>  arch/x86/kernel/pci-gart_64.c    |    2 +-
>  include/asm-x86/bitops.h         |   10 ----------
>  include/linux/iommu-helper.h     |    1 +
>  lib/iommu-helper.c               |    5 ++---
>  6 files changed, 6 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
> index 853b614..0ad59b0 100644
> --- a/arch/x86/kernel/amd_iommu.c
> +++ b/arch/x86/kernel/amd_iommu.c
> @@ -582,7 +582,7 @@ static void dma_ops_reserve_addresses(struct dma_ops_domain *dom,
>  	if (start_page + pages > last_page)
>  		pages = last_page - start_page;
>  
> -	set_bit_string(dom->bitmap, start_page, pages);
> +	iommu_area_reserve(dom->bitmap, start_page, pages);
>  }
>  
>  static void dma_ops_free_pagetable(struct dma_ops_domain *dma_dom)
> diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
> index fe7695e..080d1d2 100644
> --- a/arch/x86/kernel/pci-calgary_64.c
> +++ b/arch/x86/kernel/pci-calgary_64.c
> @@ -261,7 +261,7 @@ static void iommu_range_reserve(struct iommu_table *tbl,
>  			       badbit, tbl, start_addr, npages);
>  	}
>  
> -	set_bit_string(tbl->it_map, index, npages);
> +	iommu_area_reserve(tbl->it_map, index, npages);
>  
>  	spin_unlock_irqrestore(&tbl->it_lock, flags);
>  }
> diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
> index 508ef47..3dcb1ad 100644
> --- a/arch/x86/kernel/pci-gart_64.c
> +++ b/arch/x86/kernel/pci-gart_64.c
> @@ -827,7 +827,7 @@ void __init gart_iommu_init(void)
>  	 * Out of IOMMU space handling.
>  	 * Reserve some invalid pages at the beginning of the GART.
>  	 */
> -	set_bit_string(iommu_gart_bitmap, 0, EMERGENCY_PAGES);
> +	iommu_area_reserve(iommu_gart_bitmap, 0, EMERGENCY_PAGES);
>  
>  	agp_memory_reserved = iommu_size;
>  	printk(KERN_INFO
> diff --git a/include/asm-x86/bitops.h b/include/asm-x86/bitops.h
> index 61989b9..451a747 100644
> --- a/include/asm-x86/bitops.h
> +++ b/include/asm-x86/bitops.h
> @@ -424,16 +424,6 @@ static inline int fls(int x)
>  
>  #undef ADDR
>  
> -static inline void set_bit_string(unsigned long *bitmap,
> -		unsigned long i, int len)
> -{
> -	unsigned long end = i + len;
> -	while (i < end) {
> -		__set_bit(i, bitmap);
> -		i++;
> -	}
> -}
> -
>  #ifdef __KERNEL__
>  
>  #include <asm-generic/bitops/sched.h>
> diff --git a/include/linux/iommu-helper.h b/include/linux/iommu-helper.h
> index 58f4110..786539e 100644
> --- a/include/linux/iommu-helper.h
> +++ b/include/linux/iommu-helper.h
> @@ -11,6 +11,7 @@ static inline unsigned long iommu_device_max_index(unsigned long size,
>  extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
>  				  unsigned long shift,
>  				  unsigned long boundary_size);
> +extern void iommu_area_reserve(unsigned long *map, unsigned long i, int len);
>  extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
>  				      unsigned long start, unsigned int nr,
>  				      unsigned long shift,
> diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c
> index a3b8d4c..5d90074 100644
> --- a/lib/iommu-helper.c
> +++ b/lib/iommu-helper.c
> @@ -30,8 +30,7 @@ again:
>  	return index;
>  }
>  
> -static inline void set_bit_area(unsigned long *map, unsigned long i,
> -				int len)
> +void iommu_area_reserve(unsigned long *map, unsigned long i, int len)
>  {
>  	unsigned long end = i + len;
>  	while (i < end) {
> @@ -64,7 +63,7 @@ again:
>  			start = index + 1;
>  			goto again;
>  		}
> -		set_bit_area(map, index, nr);
> +		iommu_area_reserve(map, index, nr);
>  	}
>  	return index;
>  }
> -- 
> 1.5.4.2
> 
> 

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