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Original file line number | Diff line number | Diff line change |
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mutable struct SVMBuffer{T} | ||
ptr::Ptr{T} | ||
len::Int | ||
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function SVMBuffer{T}(len::Integer, typ::Symbol=:rw; | ||
fine_grained=false, alignment=nothing) where {T} | ||
flags = if typ == :rw | ||
CL_MEM_READ_WRITE | ||
elseif typ == :r | ||
CL_MEM_READ_ONLY | ||
elseif typ == :w | ||
CL_MEM_WRITE_ONLY | ||
else | ||
throw(ArgumentError("Invalid access type")) | ||
end | ||
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if fine_grained | ||
flags |= CL_MEM_SVM_FINE_GRAIN_BUFFER | ||
end | ||
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ptr = clSVMAlloc(context(), flags, len * sizeof(T), something(alignment, 0)) | ||
obj = new{T}(ptr, len) | ||
finalizer(obj) do x | ||
# TODO: asynchronous free using clEnqueueSVMFree? | ||
clSVMFree(context(), x) | ||
end | ||
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return obj | ||
end | ||
end | ||
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Base.unsafe_convert(::Type{Ptr{T}}, x::SVMBuffer) where {T} = convert(Ptr{T}, x.ptr) | ||
@inline function Base.pointer(x::SVMBuffer{T}, i::Integer=1) where T | ||
Base.unsafe_convert(Ptr{T}, x) + (i-1)*sizeof(T) | ||
end | ||
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Base.ndims(b::SVMBuffer) = 1 | ||
Base.eltype(b::SVMBuffer{T}) where {T} = T | ||
Base.length(b::SVMBuffer{T}) where {T} = b.len | ||
Base.sizeof(b::SVMBuffer{T}) where {T} = b.len * sizeof(T) | ||
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## memory operations | ||
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# these generally only make sense for coarse-grained SVM buffers; | ||
# fine-grained buffers can just be used directly. | ||
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# copy from and to SVM buffers | ||
for (srcty, dstty) in [(:Array, :SVMBuffer), (:SVMBuffer, :Array), (:SVMBuffer, :SVMBuffer)] | ||
@eval begin | ||
function Base.unsafe_copyto!(dst::$dstty{T}, dst_off::Int, src::$srcty{T}, src_off::Int, | ||
N::Int; blocking::Bool=false, | ||
wait_for::Vector{Event}=Event[]) where T | ||
nbytes = N * sizeof(T) | ||
n_evts = length(wait_for) | ||
evt_ids = isempty(wait_for) ? C_NULL : [pointer(evt) for evt in wait_for] | ||
ret_evt = Ref{cl_event}() | ||
clEnqueueSVMMemcpy(queue(), blocking, pointer(dst, dst_off), | ||
pointer(src, src_off), nbytes, n_evts, evt_ids, ret_evt) | ||
@return_nanny_event(ret_evt[], dst) | ||
end | ||
Base.unsafe_copyto!(dst::$dstty, src::$srcty, N; kwargs...) = | ||
unsafe_copyto!(dst, 1, src, 1, N; kwargs...) | ||
end | ||
end | ||
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# map an SVM buffer into the host address space and return a (pinned) array and an event | ||
function unsafe_map!(b::SVMBuffer{T}, dims::Dims, flags=:rw; offset::Integer=1, | ||
blocking::Bool=false, wait_for::Vector{Event}=Event[]) where {T} | ||
n_evts = length(wait_for) | ||
evt_ids = isempty(wait_for) ? C_NULL : [pointer(evt) for evt in wait_for] | ||
flags = if flags == :rw | ||
CL_MAP_READ | CL_MAP_WRITE | ||
elseif flags == :r | ||
CL_MAP_READ | ||
elseif flags == :w | ||
CL_MAP_WRITE | ||
else | ||
throw(ArgumentError("enqueue_unmap can have flags of :r, :w, or :rw, got :$flags")) | ||
end | ||
nbytes = prod(dims) * sizeof(T) | ||
ret_evt = Ref{cl_event}() | ||
clEnqueueSVMMap(queue(), blocking, flags, pointer(b, offset), nbytes, | ||
n_evts, evt_ids, ret_evt) | ||
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return unsafe_wrap(Array, pointer(b, offset), dims; own=false), Event(ret_evt[]) | ||
end | ||
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# unmap a buffer, return an event | ||
function unsafe_unmap!(b::SVMBuffer{T}, a::Array{T}; wait_for::Vector{Event}=Event[]) where {T} | ||
n_evts = length(wait_for) | ||
evt_ids = isempty(wait_for) ? C_NULL : [pointer(evt) for evt in wait_for] | ||
ret_evt = Ref{cl_event}() | ||
clEnqueueSVMUnmap(queue(), pointer(a), n_evts, evt_ids, ret_evt) | ||
return Event(ret_evt[]) | ||
end | ||
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# fill a buffer with a pattern, returning an event | ||
function unsafe_fill!(b::SVMBuffer{T}, pattern::T, offset::Integer, N::Integer; | ||
wait_for::Vector{Event}=Event[]) where {T} | ||
n_evts = length(wait_for) | ||
evt_ids = isempty(wait_for) ? C_NULL : [pointer(evt) for evt in wait_for] | ||
ret_evt = Ref{cl_event}() | ||
nbytes = N * sizeof(T) | ||
nbytes_pattern = sizeof(T) | ||
@assert nbytes_pattern > 0 | ||
clEnqueueSVMMemFill(queue(), pointer(b, offset), [pattern], | ||
nbytes_pattern, nbytes, | ||
n_evts, evt_ids, ret_evt) | ||
@return_event ret_evt[] | ||
end | ||
unsafe_fill!(b::SVMBuffer, pattern, N::Integer) = unsafe_fill!(b, pattern, 1, N) |
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