linux-kernel - Re: [PATCH 1/7] x86/amd-iommu: Add flush

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Date:	Thu, 11 Feb 2010 11:40:02 -0500
From:	Don Dutile <ddutile@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] x86/amd-iommu: Add flush_info to protection domains

Joerg Roedel wrote:
> This patch adds a new sub-struct to protection domains which
> is used to keep information about what parts of the domain
> needs to be flushed on the hardware side.
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  arch/x86/include/asm/amd_iommu_types.h |   11 +++++++++++
>  arch/x86/kernel/amd_iommu.c            |   23 +++++++++++++++++++++++
>  2 files changed, 34 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h
> index ba19ad4..30c4410 100644
> --- a/arch/x86/include/asm/amd_iommu_types.h
> +++ b/arch/x86/include/asm/amd_iommu_types.h
> @@ -230,6 +230,16 @@ extern bool amd_iommu_np_cache;
>  #define APERTURE_PAGE_INDEX(a)	(((a) >> 21) & 0x3fULL)
>  
>  /*
> + * This struct holds information about the parts of a protection domain that
> + * needs to be flushed on the IOMMU hardware.
> + */
> +struct flush_info {
> +	bool tlb;
> +	u64 start;
> +	u64 end;
> +};
> +
> +/*
>   * This structure contains generic data for  IOMMU protection domains
>   * independent of their use.
>   */
> @@ -244,6 +254,7 @@ struct protection_domain {
>  	bool updated;		/* complete domain flush required */
>  	unsigned dev_cnt;	/* devices assigned to this domain */
>  	unsigned dev_iommu[MAX_IOMMUS]; /* per-IOMMU reference count */
> +	struct flush_info flush;
>  	void *priv;		/* private data */
>  
>  };
> diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
> index adb0ba0..fcb85e8 100644
> --- a/arch/x86/kernel/amd_iommu.c
> +++ b/arch/x86/kernel/amd_iommu.c
> @@ -78,6 +78,19 @@ static struct iommu_dev_data *get_dev_data(struct device *dev)
>  	return dev->archdata.iommu;
>  }
>  
> +static void update_flush_info_tlb(struct protection_domain *domain,
> +				  u64 start, u64 end)
> +{
> +	if (!domain->flush.tlb) {
> +		domain->flush.tlb   = true;
> +		domain->flush.start = start;
> +		domain->flush.end   = end;
> +	} else {
> +		domain->flush.start = min(start, domain->flush.start);
> +		domain->flush.end   = max(end  , domain->flush.end);
> +	}
> +}
> +

the code has start/end here.... but callers below.... 

>  /*
>   * In this function the list of preallocated protection domains is traversed to
>   * find the domain for a specific device
> @@ -1849,6 +1862,9 @@ retry:
>  
>  	ADD_STATS_COUNTER(alloced_io_mem, size);
>  
> +	if (unlikely(amd_iommu_np_cache))
> +		update_flush_info_tlb(&dma_dom->domain, start, size);
> +

use start/size .... 
>  	if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) {
>  		iommu_flush_tlb(&dma_dom->domain);
>  		dma_dom->need_flush = false;
> @@ -1895,6 +1911,8 @@ static void __unmap_single(struct dma_ops_domain *dma_dom,
>  		start += PAGE_SIZE;
>  	}
>  
> +	update_flush_info_tlb(&dma_dom->domain, dma_addr, size);
> +
use start/size .... 

so is end a size in update_flush_info_tlb() , or should size be dma_addr+size 
in the callers of update_flush_info_tlb() ?

>  	SUB_STATS_COUNTER(alloced_io_mem, size);
>  
>  	dma_ops_free_addresses(dma_dom, dma_addr, pages);
> @@ -2465,6 +2483,9 @@ static int amd_iommu_map_range(struct iommu_domain *dom,
>  		paddr += PAGE_SIZE;
>  	}
>  
> +	if (unlikely(amd_iommu_np_cache))
> +		update_flush_info_tlb(domain, iova, iova + size);
> +
>  	return 0;
>  }
>  
> @@ -2482,6 +2503,8 @@ static void amd_iommu_unmap_range(struct iommu_domain *dom,
>  		iova  += PAGE_SIZE;
>  	}
>  
> +	update_flush_info_tlb(domain, iova, iova + size);
> +
>  	iommu_flush_tlb_pde(domain);
>  }
>  

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