linux-kernel - RE: [PATCH v2 03/12] iommu/vt-d: Move page table helpers into header

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Date:   Thu, 6 Sep 2018 02:15:27 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "David Woodhouse" <dwmw2@...radead.org>
CC:     "Raj, Ashok" <ashok.raj@...el.com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>, "Sun, Yi Y" <yi.y.sun@...el.com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: RE: [PATCH v2 03/12] iommu/vt-d: Move page table helpers into header

> From: Lu Baolu [mailto:baolu.lu@...ux.intel.com]
> Sent: Thursday, August 30, 2018 9:35 AM
> 
> So that they could also be used in other source files.
> 
> Cc: Ashok Raj <ashok.raj@...el.com>
> Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Cc: Kevin Tian <kevin.tian@...el.com>
> Cc: Liu Yi L <yi.l.liu@...el.com>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Reviewed-by: Ashok Raj <ashok.raj@...el.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>

> ---
>  drivers/iommu/intel-iommu.c | 43 -------------------------------------
>  include/linux/intel-iommu.h | 43
> +++++++++++++++++++++++++++++++++++++
>  2 files changed, 43 insertions(+), 43 deletions(-)
> 
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index b0da4f765274..93cde957adc7 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -315,49 +315,6 @@ static inline void context_clear_entry(struct
> context_entry *context)
>  	context->hi = 0;
>  }
> 
> -/*
> - * 0: readable
> - * 1: writable
> - * 2-6: reserved
> - * 7: super page
> - * 8-10: available
> - * 11: snoop behavior
> - * 12-63: Host physcial address
> - */
> -struct dma_pte {
> -	u64 val;
> -};
> -
> -static inline void dma_clear_pte(struct dma_pte *pte)
> -{
> -	pte->val = 0;
> -}
> -
> -static inline u64 dma_pte_addr(struct dma_pte *pte)
> -{
> -#ifdef CONFIG_64BIT
> -	return pte->val & VTD_PAGE_MASK;
> -#else
> -	/* Must have a full atomic 64-bit read */
> -	return  __cmpxchg64(&pte->val, 0ULL, 0ULL) & VTD_PAGE_MASK;
> -#endif
> -}
> -
> -static inline bool dma_pte_present(struct dma_pte *pte)
> -{
> -	return (pte->val & 3) != 0;
> -}
> -
> -static inline bool dma_pte_superpage(struct dma_pte *pte)
> -{
> -	return (pte->val & DMA_PTE_LARGE_PAGE);
> -}
> -
> -static inline int first_pte_in_page(struct dma_pte *pte)
> -{
> -	return !((unsigned long)pte & ~VTD_PAGE_MASK);
> -}
> -
>  /*
>   * This domain is a statically identity mapping domain.
>   *	1. This domain creats a static 1:1 mapping to all usable memory.
> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
> index 2173ae35f1dc..41791903a5e3 100644
> --- a/include/linux/intel-iommu.h
> +++ b/include/linux/intel-iommu.h
> @@ -501,6 +501,49 @@ static inline void __iommu_flush_cache(
>  		clflush_cache_range(addr, size);
>  }
> 
> +/*
> + * 0: readable
> + * 1: writable
> + * 2-6: reserved
> + * 7: super page
> + * 8-10: available
> + * 11: snoop behavior
> + * 12-63: Host physcial address
> + */
> +struct dma_pte {
> +	u64 val;
> +};
> +
> +static inline void dma_clear_pte(struct dma_pte *pte)
> +{
> +	pte->val = 0;
> +}
> +
> +static inline u64 dma_pte_addr(struct dma_pte *pte)
> +{
> +#ifdef CONFIG_64BIT
> +	return pte->val & VTD_PAGE_MASK;
> +#else
> +	/* Must have a full atomic 64-bit read */
> +	return  __cmpxchg64(&pte->val, 0ULL, 0ULL) & VTD_PAGE_MASK;
> +#endif
> +}
> +
> +static inline bool dma_pte_present(struct dma_pte *pte)
> +{
> +	return (pte->val & 3) != 0;
> +}
> +
> +static inline bool dma_pte_superpage(struct dma_pte *pte)
> +{
> +	return (pte->val & DMA_PTE_LARGE_PAGE);
> +}
> +
> +static inline int first_pte_in_page(struct dma_pte *pte)
> +{
> +	return !((unsigned long)pte & ~VTD_PAGE_MASK);
> +}
> +
>  extern struct dmar_drhd_unit * dmar_find_matched_drhd_unit(struct
> pci_dev *dev);
>  extern int dmar_find_matched_atsr_unit(struct pci_dev *dev);
> 
> --
> 2.17.1