Define CuArray on FieldArrays

Author: charleskawczynski

ext/cuda/data_layouts.jl

@@ -78,3 +78,17 @@ function Adapt.adapt_structure(
         Adapt.adapt(to, bc.axes),
     )
 end
+
+import ClimaCore.DataLayouts as DL
+import CUDA
+function CUDA.CuArray(fa::DL.FieldArray{FD}) where {FD}
+    arrays = ntuple(Val(DL.ncomponents(fa))) do f
+        CUDA.CuArray(fa.arrays[f])
+    end
+    return DL.FieldArray{FD}(arrays)
+end
+
+DL.field_array(
+    array::CUDA.CuArray,
+    as::ArraySize
+) = CUDA.CuArray(DL.field_array(Array(array), as))

ext/cuda/data_layouts_copyto.jl

@@ -69,11 +69,11 @@ function cuda_copyto!(dest::AbstractData, bc)
             auto_launch!(
                 knl_copyto_linear!,
                 (dest, bc′, us),
-                nitems;
+                n;
                 auto = true,
             )
         else
-            auto_launch!(knl_copyto_flat!, (dest, bc, us), nitems; auto = true)
+            auto_launch!(knl_copyto_flat!, (dest, bc, us), n; auto = true)
         end
     end
     return dest

src/DataLayouts/DataLayouts.jl

@@ -401,14 +401,19 @@ end
 
 Base.length(data::IJFH) = get_Nh(data)
 
-Base.@propagate_inbounds slab(data::IJFH, h::Integer) = slab(data, 1, h)
-
 @inline function slab(data::IJFH{S, Nij}, v::Integer, h::Integer) where {S, Nij}
     @boundscheck (v >= 1 && 1 <= h <= get_Nh(data)) ||
                  throw(BoundsError(data, (v, h)))
-    slab(data, h)
+    fa = field_array(data)
+    sub_arrays = ntuple(Val(ncomponents(fa))) do jf
+        view(fa.arrays[jf], :, :, h)
+    end
+    dataview = FieldArray{field_dim(IJF)}(sub_arrays)
+    IJF{S, Nij, typeof(dataview)}(dataview)
 end
 
+Base.@propagate_inbounds slab(data::IJFH, h::Integer) = slab(data, 1, h)
+
 @inline function column(data::IJFH{S, Nij}, i, j, h) where {S, Nij}
     @boundscheck (1 <= j <= Nij && 1 <= i <= Nij && 1 <= h <= get_Nh(data)) ||
                  throw(BoundsError(data, (i, j, h)))