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, 182 insertions, 0 deletions

diff --git a/src/cpu/CpuContext.cpp b/src/cpu/CpuContext.cpp
new file mode 100644
index 0000000000..5980a5ab0d
--- /dev/null
+++ b/src/cpu/CpuContext.cpp
@@ -0,0 +1,182 @@
+/*
+ * 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 "src/cpu/CpuContext.h"
+
+#include "arm_compute/core/CPP/CPPTypes.h"
+#include "src/runtime/CPUUtils.h"
+
+#include <cstdlib>
+
+namespace arm_compute
+{
+namespace cpu
+{
+namespace
+{
+void *default_allocate(void *user_data, size_t size)
+{
+    ARM_COMPUTE_UNUSED(user_data);
+    return ::operator new(size);
+}
+void default_free(void *user_data, void *ptr)
+{
+    ARM_COMPUTE_UNUSED(user_data);
+    ::operator delete(ptr);
+}
+void *default_aligned_allocate(void *user_data, size_t size, size_t alignment)
+{
+    ARM_COMPUTE_UNUSED(user_data);
+    void *ptr = nullptr;
+#if defined(BARE_METAL) || defined(__APPLE__)
+    size_t rem       = size % alignment;
+    size_t real_size = (rem) ? (size + alignment - rem) : size;
+    ptr              = aligned_alloc(alignment, real_size);
+#else  /* defined(BARE_METAL) || defined(__APPLE__) */
+    posix_memalign(&ptr, alignment, size);
+#endif /* defined(BARE_METAL) || defined(__APPLE__) */
+    return ptr;
+}
+void default_aligned_free(void *user_data, void *ptr)
+{
+    ARM_COMPUTE_UNUSED(user_data);
+    free(ptr);
+}
+static AclAllocator default_allocator = { &default_allocate,
+                                          &default_free,
+                                          &default_aligned_allocate,
+                                          &default_aligned_free,
+                                          nullptr
+                                        };
+
+AllocatorWrapper populate_allocator(AclAllocator *external_allocator)
+{
+    bool is_valid = (external_allocator != nullptr);
+    if(is_valid)
+    {
+        is_valid = is_valid && (external_allocator->alloc != nullptr);
+        is_valid = is_valid && (external_allocator->free != nullptr);
+        is_valid = is_valid && (external_allocator->aligned_alloc != nullptr);
+        is_valid = is_valid && (external_allocator->aligned_free != nullptr);
+    }
+    return is_valid ? AllocatorWrapper(*external_allocator) : AllocatorWrapper(default_allocator);
+}
+
+CpuCapabilities populate_capabilities_legacy(const CPUInfo &cpu_info)
+{
+    CpuCapabilities caps;
+
+    // Extract SIMD extension
+    caps.neon = true;
+#ifdef SVE2
+    caps.sve2 = true;
+#endif /* SVE2 */
+    // Extract data-type support
+    caps.fp16 = cpu_info.has_fp16();
+#ifdef V8P6_BF
+    caps.bf16 = true;
+#endif /* V8P6_BF */
+
+    // Extract ISA extensions
+    caps.dot = cpu_info.has_dotprod();
+#ifdef MMLA_FP32
+    caps.mmla_fp = true;
+#endif /* MMLA_FP32 */
+#ifdef MMLA_INT8
+    caps.mmla_int8 = true;
+#endif /* MMLA_INT8 */
+
+    return caps;
+}
+
+CpuCapabilities populate_capabilities_flags(AclTargetCapabilities external_caps)
+{
+    CpuCapabilities caps;
+
+    // Extract SIMD extension
+    caps.neon = external_caps & AclCpuCapabilitiesNeon;
+    caps.sve  = external_caps & AclCpuCapabilitiesSve;
+    caps.sve2 = external_caps & AclCpuCapabilitiesSve2;
+    // Extract data-type support
+    caps.fp16 = external_caps & AclCpuCapabilitiesFp16;
+    caps.bf16 = external_caps & AclCpuCapabilitiesBf16;
+    // Extract ISA extensions
+    caps.dot       = external_caps & AclCpuCapabilitiesDot;
+    caps.mmla_fp   = external_caps & AclCpuCapabilitiesMmlaFp;
+    caps.mmla_int8 = external_caps & AclCpuCapabilitiesMmlaInt8;
+
+    return caps;
+}
+
+CpuCapabilities populate_capabilities(AclTargetCapabilities external_caps,
+                                      int32_t               max_threads)
+{
+    // Extract legacy structure
+    CPUInfo cpu_info;
+    arm_compute::utils::cpu::get_cpu_configuration(cpu_info);
+
+    CpuCapabilities caps;
+    if(external_caps != AclCpuCapabilitiesAuto)
+    {
+        caps = populate_capabilities_flags(external_caps);
+    }
+    else
+    {
+        caps = populate_capabilities_legacy(cpu_info);
+    }
+
+    // Set max number of threads
+#if defined(BARE_METAL)
+    ARM_COMPUTE_UNUSED(max_threads);
+    caps.max_threads = 1;
+#else  /* defined(BARE_METAL) */
+    caps.max_threads = (max_threads > 0) ? max_threads : std::thread::hardware_concurrency();
+#endif /* defined(BARE_METAL) */
+
+    return caps;
+}
+} // namespace
+
+CpuContext::CpuContext(const AclContextOptions *options)
+    : IContext(Target::Cpu),
+      _allocator(default_allocator),
+      _caps(populate_capabilities(AclCpuCapabilitiesAuto, -1))
+{
+    if(options != nullptr)
+    {
+        _allocator = populate_allocator(options->allocator);
+        _caps      = populate_capabilities(options->capabilities, options->max_compute_units);
+    }
+}
+
+const CpuCapabilities &CpuContext::capabilities() const
+{
+    return _caps;
+}
+
+AllocatorWrapper &CpuContext::allocator()
+{
+    return _allocator;
+}
+} // namespace cpu
+} // namespace arm_compute