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diff --git a/intern/cycles/integrator/path_trace_work_cpu.h b/intern/cycles/integrator/path_trace_work_cpu.h
new file mode 100644
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+++ b/intern/cycles/integrator/path_trace_work_cpu.h
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+/*
+ * Copyright 2011-2021 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "kernel/integrator/integrator_state.h"
+
+#include "device/cpu/kernel_thread_globals.h"
+#include "device/device_queue.h"
+
+#include "integrator/path_trace_work.h"
+
+#include "util/util_vector.h"
+
+CCL_NAMESPACE_BEGIN
+
+struct KernelWorkTile;
+struct KernelGlobals;
+
+class CPUKernels;
+
+/* Implementation of PathTraceWork which schedules work on to queues pixel-by-pixel,
+ * for CPU devices.
+ *
+ * NOTE: For the CPU rendering there are assumptions about TBB arena size and number of concurrent
+ * queues on the render device which makes this work be only usable on CPU. */
+class PathTraceWorkCPU : public PathTraceWork {
+ public:
+  PathTraceWorkCPU(Device *device,
+                   Film *film,
+                   DeviceScene *device_scene,
+                   bool *cancel_requested_flag);
+
+  virtual void init_execution() override;
+
+  virtual void render_samples(RenderStatistics &statistics,
+                              int start_sample,
+                              int samples_num) override;
+
+  virtual void copy_to_gpu_display(GPUDisplay *gpu_display,
+                                   PassMode pass_mode,
+                                   int num_samples) override;
+  virtual void destroy_gpu_resources(GPUDisplay *gpu_display) override;
+
+  virtual bool copy_render_buffers_from_device() override;
+  virtual bool copy_render_buffers_to_device() override;
+  virtual bool zero_render_buffers() override;
+
+  virtual int adaptive_sampling_converge_filter_count_active(float threshold, bool reset) override;
+  virtual void cryptomatte_postproces() override;
+
+ protected:
+  /* Core path tracing routine. Renders given work time on the given queue. */
+  void render_samples_full_pipeline(KernelGlobals *kernel_globals,
+                                    const KernelWorkTile &work_tile,
+                                    const int samples_num);
+
+  /* CPU kernels. */
+  const CPUKernels &kernels_;
+
+  /* Copy of kernel globals which is suitable for concurrent access from multiple threads.
+   *
+   * More specifically, the `kernel_globals_` is local to each threads and nobody else is
+   * accessing it, but some "localization" is required to decouple from kernel globals stored
+   * on the device level. */
+  vector<CPUKernelThreadGlobals> kernel_thread_globals_;
+};
+
+CCL_NAMESPACE_END