linux-kernel - Re: [PATCH 11/34] AMD IOMMU: add functions for IOMMU hardware initialization from ACPI

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Date:	Wed, 9 Jul 2008 18:49:17 -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 11/34] AMD IOMMU: add functions for IOMMU hardware
 initialization from ACPI

On Thu, 26 Jun 2008 21:27:47 +0200 Joerg Roedel <joerg.roedel@....com> wrote:

> This patch adds functions to initialize the IOMMU hardware with information
> from ACPI and PCI.
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  arch/x86/kernel/amd_iommu_init.c |  125 ++++++++++++++++++++++++++++++++++++++
>  1 files changed, 125 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
> index 4c37abb..8ec48f1 100644
> --- a/arch/x86/kernel/amd_iommu_init.c
> +++ b/arch/x86/kernel/amd_iommu_init.c
> @@ -353,3 +353,128 @@ static void __init set_device_exclusion_range(u16 devid, struct ivmd_header *m)
>  	}
>  }
>  
> +static void __init init_iommu_from_pci(struct amd_iommu *iommu)
> +{
> +	int bus = PCI_BUS(iommu->devid);
> +	int dev = PCI_SLOT(iommu->devid);
> +	int fn  = PCI_FUNC(iommu->devid);
> +	int cap_ptr = iommu->cap_ptr;
> +	u32 range;
> +
> +	iommu->cap = read_pci_config(bus, dev, fn, cap_ptr+MMIO_CAP_HDR_OFFSET);
> +
> +	range = read_pci_config(bus, dev, fn, cap_ptr+MMIO_RANGE_OFFSET);
> +	iommu->first_device = DEVID(MMIO_GET_BUS(range), MMIO_GET_FD(range));
> +	iommu->last_device = DEVID(MMIO_GET_BUS(range), MMIO_GET_LD(range));
> +}
> +
> +static void __init init_iommu_from_acpi(struct amd_iommu *iommu,
> +					struct ivhd_header *h)
> +{
> +	u8 *p = (u8 *)h;
> +	u8 *end = p, flags = 0;
> +	u16 dev_i, devid = 0, devid_start = 0, devid_to = 0;
> +	u32 ext_flags = 0;
> +	bool alias = 0;

Using `false' would be more conventional.

> +			alias = 1;

`true'.

etc.


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