On Tue, May 30, 2017 at 05:33:39PM +0530, Geetha sowjanya wrote:
> From: Linu Cherian <linu.cherian@xxxxxxxxxx>
>
> Cavium ThunderX2 implementation doesn't support second page in SMMU
> register space. Hence, resource size is set as 64k for this model.
>
> Signed-off-by: Linu Cherian <linu.cherian@xxxxxxxxxx>
> Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@xxxxxxxxxx>
> ---
> drivers/acpi/arm64/iort.c | 10 +++++++++-
> 1 files changed, 9 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index c5fecf9..bba2b59 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -833,12 +833,20 @@ static void __init arm_smmu_v3_init_resources(struct resource *res,
> {
> struct acpi_iort_smmu_v3 *smmu;
> int num_res = 0;
> + unsigned long size = SZ_128K;
>
> /* Retrieve SMMUv3 specific data */
> smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
>
> + /*
> + * Override the size, for Cavium ThunderX2 implementation
> + * which doesn't support the page 1 SMMU register space.
> + */
> + if (smmu->model == ACPI_IORT_SMMU_CAVIUM_CN99XX)
> + size = SZ_64K;
Nit: add a function, say arm_smmu_v3_resource_size() with the logic
above that by default returns SZ_128K, I do not like this switch
in the middle of this function.
Lorenzo
> +
> res[num_res].start = smmu->base_address;
> - res[num_res].end = smmu->base_address + SZ_128K - 1;
> + res[num_res].end = smmu->base_address + size - 1;
> res[num_res].flags = IORESOURCE_MEM;
>
> num_res++;
> --
> 1.7.1
>
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