npu, npu2: Describe diag data size in device tree

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@russell.cc> Acked-by: Alistair Popple <alistair@popple.id.au> Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
open-power · May 3, 2017 · 5971f6e · 5971f6e
1 parent fa70adc
commit 5971f6e
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diff --git 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
@@ -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,