Introduce Context opaque object of the new interface

An AclContext is introduced as part of the new interface.
This object is responsible for any constructural services that the
operators and other objects might need.

Main options that can be passed to a context object are:
- a target: for which all the subsequent object should bind with
- capabilities: which are the isa/target features to enable
- a mode: for which different strategies can be selected in the backend

Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Change-Id: I315549e55d4d064cbe94dfa29d070dc281b447de
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5088
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>

1 files changed, 122 insertions, 0 deletions

diff --git a/src/c/AclContext.cpp b/src/c/AclContext.cpp
new file mode 100644
index 0000000000..e88995bcff
--- /dev/null
+++ b/src/c/AclContext.cpp
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2021 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "arm_compute/AclEntrypoints.h"
+
+#include "src/common/IContext.h"
+#include "src/common/utils/Macros.h"
+#include "src/common/utils/Validate.h"
+
+#ifdef ARM_COMPUTE_CPU_ENABLED
+#include "src/cpu/CpuContext.h"
+#endif /* ARM_COMPUTE_CPU_ENABLED */
+
+#ifdef ARM_COMPUTE_OPENCL_ENABLED
+#include "src/gpu/cl/ClContext.h"
+#endif /* ARM_COMPUTE_OPENCL_ENABLED */
+
+namespace
+{
+template <typename ContextType>
+arm_compute::IContext *create_backend_ctx(const AclContextOptions *options)
+{
+    return new(std::nothrow) ContextType(options);
+}
+
+bool is_target_valid(AclTarget target)
+{
+    return arm_compute::utils::is_in(target, { AclCpu, AclGpuOcl });
+}
+
+bool are_context_options_valid(const AclContextOptions *options)
+{
+    ARM_COMPUTE_ASSERT_NOT_NULLPTR(options);
+    return arm_compute::utils::is_in(options->mode, { AclPreferFastRerun, AclPreferFastStart });
+}
+
+arm_compute::IContext *create_context(AclTarget target, const AclContextOptions *options)
+{
+    switch(target)
+    {
+#ifdef ARM_COMPUTE_CPU_ENABLED
+        case AclCpu:
+            return create_backend_ctx<arm_compute::cpu::CpuContext>(options);
+#endif /* ARM_COMPUTE_CPU_ENABLED */
+#ifdef ARM_COMPUTE_OPENCL_ENABLED
+        case AclGpuOcl:
+            return create_backend_ctx<arm_compute::gpu::opencl::ClContext>(options);
+#endif /* ARM_COMPUTE_OPENCL_ENABLED */
+        default:
+            return nullptr;
+    }
+    return nullptr;
+}
+} // namespace
+
+extern "C" AclStatus AclCreateContext(AclContext              *ctx,
+                                      AclTarget                target,
+                                      const AclContextOptions *options)
+{
+    if(!is_target_valid(target))
+    {
+        ARM_COMPUTE_LOG_ERROR_ACL("Target is invalid");
+        return AclUnsupportedTarget;
+    }
+
+    if(options != nullptr && !are_context_options_valid(options))
+    {
+        ARM_COMPUTE_LOG_ERROR_ACL("Context options are invalid");
+        return AclInvalidArgument;
+    }
+
+    auto acl_ctx = create_context(target, options);
+    if(ctx == nullptr)
+    {
+        ARM_COMPUTE_LOG_ERROR_ACL("Couldn't allocate internal resources for context creation");
+        return AclOutOfMemory;
+    }
+    *ctx = acl_ctx;
+
+    return AclSuccess;
+}
+
+extern "C" AclStatus AclDestroyContext(AclContext external_ctx)
+{
+    using namespace arm_compute;
+
+    IContext *ctx = get_internal(external_ctx);
+
+    StatusCode status = StatusCode::Success;
+    status            = detail::validate_internal_context(ctx);
+    ARM_COMPUTE_RETURN_CENUM_ON_FAILURE(status);
+
+    if(ctx->refcount() != 0)
+    {
+        ARM_COMPUTE_LOG_ERROR_ACL("Context has references on it that haven't been released");
+        // TODO: Fix the refcount with callback when reaches 0
+    }
+
+    delete ctx;
+
+    return utils::as_cenum<AclStatus>(status);
+}