[Skiboot] [PATCH] npu, npu2: Describe diag data size in device tree

[Alistair Popple]

Acked-by: Alistair Popple <alistair at popple.id.au>

On Wed, 3 May 2017 11:49:29 AM Russell Currey wrote:
> NPU and NPU2 don't use diag data, but the kernel will allocate a buffer for
> NPU PHBs regardless.  Set ibm,phb-diag-data-size to 0 for NPU PHBs to save a
> whole precious 8K.
>
> Signed-off-by: Russell Currey <ruscur at russell.cc>
> ---
>  hw/npu.c  | 1 +
>  hw/npu2.c | 1 +
>  2 files changed, 2 insertions(+)
>
> diff --git a/hw/npu.c b/hw/npu.c
> index f00e9c5c..b113800b 100644
> --- a/hw/npu.c
> +++ b/hw/npu.c
> @@ -1152,6 +1152,7 @@ static void npu_probe_phb(struct dt_node *dn)
>  	dt_add_property_cells(np, "ibm,npcq", dn->phandle);
>  	dt_add_property_cells(np, "ibm,links", links);
>  	dt_add_property(np, "ibm,mmio-window", mm_win, sizeof(mm_win));
> +	dt_add_property_cells(np, "ibm,phb-diag-data-size", 0);
>  }
>
>  static void npu_dev_populate_vendor_cap(struct npu_dev_cap *cap)
> diff --git a/hw/npu2.c b/hw/npu2.c
> index 31726628..a8560cf1 100644
> --- a/hw/npu2.c
> +++ b/hw/npu2.c
> @@ -1209,6 +1209,7 @@ static void npu2_probe_phb(struct dt_node *dn)
>  	dt_add_property_cells(np, "ibm,npcq", dn->phandle);
>  	dt_add_property_cells(np, "ibm,links", links);
>  	dt_add_property(np, "ibm,mmio-window", mm_win, sizeof(mm_win));
> +	dt_add_property_cells(np, "ibm,phb-diag-data-size", 0);
>  }
>
>  static uint32_t npu2_populate_pcie_cap(struct npu2_dev *dev,
>