linux-kernel - Re: [PATCH 17/34] AMD IOMMU: add generic defines and structures for mapping code

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Date:	Wed, 9 Jul 2008 19:01:40 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Joerg Roedel <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 17/34] AMD IOMMU: add generic defines and structures for
 mapping code

On Thu, 26 Jun 2008 21:27:53 +0200 Joerg Roedel <joerg.roedel@....com> wrote:

> This patch adds generic stuff used by the mapping and unmapping code for the
> AMD IOMMU.
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  arch/x86/kernel/amd_iommu.c |   40 ++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 40 insertions(+), 0 deletions(-)
>  create mode 100644 arch/x86/kernel/amd_iommu.c
> 
> diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
> new file mode 100644
> index 0000000..90392c7
> --- /dev/null
> +++ b/arch/x86/kernel/amd_iommu.c
> @@ -0,0 +1,40 @@
> +/*
> + * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
> + * Author: Joerg Roedel <joerg.roedel@....com>
> + *         Leo Duran <leo.duran@....com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published
> + * by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
> + */
> +
> +#include <linux/pci.h>
> +#include <linux/gfp.h>
> +#include <linux/bitops.h>
> +#include <linux/scatterlist.h>
> +#include <linux/iommu-helper.h>
> +#include <asm/proto.h>
> +#include <asm/gart.h>
> +#include <asm/amd_iommu_types.h>
> +
> +#define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28))

Doesn't need to be implemented in a macro, hence should be implemented in C,
please.

> +#define to_pages(addr, size) \
> +	 (round_up(((addr) & ~PAGE_MASK) + (size), PAGE_SIZE) >> PAGE_SHIFT)

Does this patchset add any comments *at all*?  Is it really all so obvious
that this was justifiable?

I don't know what this function does, but it shouldn't be doing it here. 
Either it duplicates an existing helper or it should be implemented in mm.h

Preferably not as a macro.

Preferably with some documentation.

It is unobvious whether this haler has correct behaviour with all mixes of
32-bit and 64-bit signed and unsigned types.

> +static DEFINE_RWLOCK(amd_iommu_devtable_lock);
> +
> +struct command {
> +	u32 data[4];
> +};

Nothing in this file is used by anything.  I assume that later patches add
stuff to it.  This made it a bit hard to review.
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