linux-kernel - Re: [PATCH 3/8] intel-iommu: move context entry defs out from dma

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Date:	Thu, 20 Nov 2008 20:11:35 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mark McLoughlin <markmc@...hat.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	x86@...nel.org
Subject: Re: [PATCH 3/8] intel-iommu: move context entry defs out from
	dma_remapping.h


* Mark McLoughlin <markmc@...hat.com> wrote:

> Signed-off-by: Mark McLoughlin <markmc@...hat.com>
> ---
>  drivers/pci/intel-iommu.c     |   38 ++++++++++++++++++++++++++++++++++++++
>  include/linux/dma_remapping.h |   38 --------------------------------------
>  2 files changed, 38 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
> index 2e56e5a..1c011bb 100644
> --- a/drivers/pci/intel-iommu.c
> +++ b/drivers/pci/intel-iommu.c
> @@ -90,6 +90,44 @@ get_context_addr_from_root(struct root_entry *root)
>  		NULL);
>  }
>  
> +/*
> + * low 64 bits:
> + * 0: present
> + * 1: fault processing disable
> + * 2-3: translation type
> + * 12-63: address space root
> + * high 64 bits:
> + * 0-2: address width
> + * 3-6: aval
> + * 8-23: domain id
> + */
> +struct context_entry {
> +	u64 lo;
> +	u64 hi;
> +};
> +#define context_present(c) ((c).lo & 1)
> +#define context_fault_disable(c) (((c).lo >> 1) & 1)
> +#define context_translation_type(c) (((c).lo >> 2) & 3)
> +#define context_address_root(c) ((c).lo & VTD_PAGE_MASK)
> +#define context_address_width(c) ((c).hi &  7)
> +#define context_domain_id(c) (((c).hi >> 8) & ((1 << 16) - 1))
> +
> +#define context_set_present(c) do {(c).lo |= 1;} while (0)
> +#define context_set_fault_enable(c) \
> +	do {(c).lo &= (((u64)-1) << 2) | 1;} while (0)
> +#define context_set_translation_type(c, val) \
> +	do { \
> +		(c).lo &= (((u64)-1) << 4) | 3; \
> +		(c).lo |= ((val) & 3) << 2; \
> +	} while (0)
> +#define CONTEXT_TT_MULTI_LEVEL 0
> +#define context_set_address_root(c, val) \
> +	do {(c).lo |= (val) & VTD_PAGE_MASK; } while (0)
> +#define context_set_address_width(c, val) do {(c).hi |= (val) & 7;} while (0)
> +#define context_set_domain_id(c, val) \
> +	do {(c).hi |= ((val) & ((1 << 16) - 1)) << 8;} while (0)
> +#define context_clear_entry(c) do {(c).lo = 0; (c).hi = 0;} while (0)

Since you move this code, please also do a patch to clean it up to use 
inlines, not macros.

Thanks,

	Ingo
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