Re: [PATCH v12 1/3] ACPI/IORT: Add msi address regions reservation helper

[Marc Zyngier <marc.zyngier@arm.com>]

On Thu, 14 Dec 2017 16:09:55 +0000,
Shameer Kolothum wrote:
> 
> On some platforms msi parent address regions have to be excluded from
> normal IOVA allocation in that they are detected and decoded in a HW
> specific way by system components and so they cannot be considered normal
> IOVA address space.
> 
> Add a helper function that retrieves ITS address regions - the msi
> parent - through IORT device <-> ITS mappings and reserves it so that
> these regions will not be translated by IOMMU and will be excluded from
> IOVA allocations. The function checks for the smmu model number and
> only applies the msi reservation if the platform requires it.
> 
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> ---
>  drivers/acpi/arm64/iort.c        | 111 +++++++++++++++++++++++++++++++++++++--
>  drivers/irqchip/irq-gic-v3-its.c |   3 +-
>  include/linux/acpi_iort.h        |   7 ++-
>  3 files changed, 116 insertions(+), 5 deletions(-)

For the ITS part:

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>

	M.