linux-kernel - Re: [PATCH 26/34] AMD IOMMU: add mapping functions for scatter gather lists

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 30 Jun 2008 00:07:16 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	joerg.roedel@....com
Cc:	tglx@...utronix.de, mingo@...hat.com, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org, bhavna.sarathy@....com,
	Sebastian.Biemueller@....com, robert.richter@....com,
	joro@...tes.org
Subject: Re: [PATCH 26/34] AMD IOMMU: add mapping functions for scatter
 gather lists

On Thu, 26 Jun 2008 21:28:02 +0200
Joerg Roedel <joerg.roedel@....com> wrote:

> This patch adds the dma_ops functions for mapping and unmapping scatter gather
> lists.
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  arch/x86/kernel/amd_iommu.c |   98 +++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 98 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
> index b4079f6..f4747fe 100644
> --- a/arch/x86/kernel/amd_iommu.c
> +++ b/arch/x86/kernel/amd_iommu.c
> @@ -700,3 +700,101 @@ static void unmap_single(struct device *dev, dma_addr_t dma_addr,
>  	spin_unlock_irqrestore(&domain->lock, flags);
>  }
>  
> +static int map_sg_no_iommu(struct device *dev, struct scatterlist *sglist,
> +			   int nelems, int dir)
> +{
> +	struct scatterlist *s;
> +	int i;
> +
> +	for_each_sg(sglist, s, nelems, i) {
> +		s->dma_address = (dma_addr_t)sg_phys(s);
> +		s->dma_length  = s->length;
> +	}
> +
> +	return nelems;
> +}
> +
> +static int map_sg(struct device *dev, struct scatterlist *sglist,
> +		  int nelems, int dir)
> +{
> +	unsigned long flags;
> +	struct amd_iommu *iommu;
> +	struct protection_domain *domain;
> +	u16 devid;
> +	int i;
> +	struct scatterlist *s;
> +	phys_addr_t paddr;
> +	int mapped_elems = 0;
> +
> +	get_device_resources(dev, &iommu, &domain, &devid);
> +
> +	if (!iommu || !domain)
> +		return map_sg_no_iommu(dev, sglist, nelems, dir);

VT-d put a pointer in struct dev_archdata to store IOMMU info per
device. Is is useful for you too?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/