linux-kernel - Re: [PATCH 14/16] iommu/irq: Use amd_iommu_irq

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Date:	Fri, 28 Sep 2012 17:39:03 -0600
From:	Shuah Khan <shuahkhan@...il.com>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/16] iommu/irq: Use amd_iommu_irq_ops if supported

On Fri, Sep 28, 2012 at 6:24 AM, Joerg Roedel <joerg.roedel@....com> wrote:
> Finally enable interrupt remapping for AMD systems.
>
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  drivers/iommu/irq_remapping.c |    5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
> index 151690d..faf85d6 100644
> --- a/drivers/iommu/irq_remapping.c
> +++ b/drivers/iommu/irq_remapping.c
> @@ -51,6 +51,11 @@ early_param("intremap", setup_irqremap);
>  void __init setup_irq_remapping_ops(void)
>  {
>         remap_ops = &intel_irq_remap_ops;
> +
> +#ifdef CONFIG_AMD_IOMMU
> +       if (amd_iommu_irq_ops.prepare() == 0)
> +               remap_ops = &amd_iommu_irq_ops;
> +#endif

Should remap_ops be set to null when amd_iommu_irq_ops.prepare()
fails?What happens if remap_ops left set to intel_irq_remap_ops?
Should remap_ops = &intel_irq_remap_ops; moved into #else case
forifdef CONFIG_AMD_IOMMU?
>  }
>
>  int irq_remapping_supported(void)
> --
> 1.7.9.5
>
>
> --
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