[PATCH v8 01/11] ACPI/IORT: Add temporary RMR node flag definitions

[Robin Murphy]

On 2022-02-21 15:43, Shameer Kolothum via iommu wrote:
> IORT rev E.d introduces more details into the RMR node Flags
> field. Add temporary definitions to describe and access these
> Flags field until ACPICA header is updated to support E.d.
> 
> This patch can be reverted once the include/acpi/actbl2.h has
> all the relevant definitions.
> 
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi at huawei.com>
> ---
> Please find the ACPICA E.d related changes pull request here,
> https://github.com/acpica/acpica/pull/752
> 
> ---
>   drivers/acpi/arm64/iort.c | 24 ++++++++++++++++++++++++
>   1 file changed, 24 insertions(+)
> 
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index f2f8f05662de..0730c4dbb700 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -25,6 +25,30 @@
>   #define IORT_IOMMU_TYPE		((1 << ACPI_IORT_NODE_SMMU) |	\
>   				(1 << ACPI_IORT_NODE_SMMU_V3))
>   
> +/*
> + * The following RMR related definitions are temporary and
> + * can be removed once ACPICA headers support IORT rev E.d
> + */
> +#ifndef ACPI_IORT_RMR_REMAP_PERMITTED
> +#define ACPI_IORT_RMR_REMAP_PERMITTED	(1)
> +#endif
> +
> +#ifndef ACPI_IORT_RMR_ACCESS_PRIVILEGE
> +#define ACPI_IORT_RMR_ACCESS_PRIVILEGE	(1 << 1)
> +#endif
> +
> +#ifndef ACPI_IORT_RMR_ACCESS_ATTRIBUTES
> +#define ACPI_IORT_RMR_ACCESS_ATTRIBUTES(flags)	(((flags) >> 2) & 0xFF)
> +#endif
> +
> +#ifndef ACPI_IORT_RMR_ATTR_DEVICE_GRE
> +#define ACPI_IORT_RMR_ATTR_DEVICE_GRE	0x03
> +#endif
> +
> +#ifndef ACPI_IORT_RMR_ATTR_NORMAL
> +#define ACPI_IORT_RMR_ATTR_NORMAL	0x05

For the record, I've commented directly on the ACPICA pull request that 
I think this should be more clearly named to indicate that it means 
Normal Write-Back Cacheable, rather than being potentially ambiguous 
about cacheability.

Robin.

> +#endif
> +
>   struct iort_its_msi_chip {
>   	struct list_head	list;
>   	struct fwnode_handle	*fw_node;