Re: [PATCH 01/16] iommu/amd: Keep track of HPET and IOAPIC device ids

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Fri, Sep 28, 2012 at 02:23:51PM +0200, Joerg Roedel wrote:
> The IVRS ACPI table provides information about the IOAPICs
> and the HPETs available in the system and which PCI device
> ID they use in transactions. Save that information for later
> usage in interrupt remapping.
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
> ---
>  drivers/iommu/amd_iommu.c       |    3 ++
>  drivers/iommu/amd_iommu_init.c  |   65 +++++++++++++++++++++++++++++++++++++--
>  drivers/iommu/amd_iommu_types.h |   34 ++++++++++++++++++++
>  3 files changed, 100 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
> index b64502d..6f51483 100644
> --- a/drivers/iommu/amd_iommu.c
> +++ b/drivers/iommu/amd_iommu.c
> @@ -72,6 +72,9 @@ static DEFINE_SPINLOCK(iommu_pd_list_lock);
>  static LIST_HEAD(dev_data_list);
>  static DEFINE_SPINLOCK(dev_data_list_lock);
>  
> +LIST_HEAD(ioapic_map);
> +LIST_HEAD(hpet_map);
> +
>  /*
>   * Domain for untranslated devices - only allocated
>   * if iommu=pt passed on kernel cmd line.
> diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
> index 18a89b7..a9f3948 100644
> --- a/drivers/iommu/amd_iommu_init.c
> +++ b/drivers/iommu/amd_iommu_init.c
> @@ -55,6 +55,7 @@
>  #define IVHD_DEV_ALIAS_RANGE            0x43
>  #define IVHD_DEV_EXT_SELECT             0x46
>  #define IVHD_DEV_EXT_SELECT_RANGE       0x47
> +#define IVHD_DEV_SPECIAL		0x48
>  
>  #define IVHD_FLAG_HT_TUN_EN_MASK        0x01
>  #define IVHD_FLAG_PASSPW_EN_MASK        0x02
> @@ -690,6 +691,31 @@ static void __init set_dev_entry_from_acpi(struct amd_iommu *iommu,
>  	set_iommu_for_device(iommu, devid);
>  }
>  
> +static int add_special_device(u8 type, u8 id, u16 devid)
> +{
> +	struct devid_map *entry;
> +	struct list_head *list;
> +
> +	if (type != 1 && type != 2)
> +		return -EINVAL;

Should this be perhaps an enum? or #define?

> +
> +	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
> +	if (!entry)
> +		return -ENOMEM;
> +
> +	entry->id    = id;
> +	entry->devid = devid;
> +
> +	if (type == 1)
> +		list = &ioapic_map;
> +	else
> +		list = &hpet_map;
> +
> +	list_add_tail(&entry->list, list);
> +
> +	return 0;
> +}
> +

Reviwed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>