rocm-systems/runtime/hsa-runtime

Package Contents

This directory contains the ROC Runtime source code based on the HSA Runtime but modified to support AMD/ATI discrete GPUs.

Source & Include directories

core - Contains the source code for AMD's implementation of the core HSA Runtime API's.

cmake_modules - CMake support modules and files.

inc - Contains the public and AMD specific header files exposing the HSA Runtimes interfaces.

libamdhsacode - Code object definitions and interface.

loader - Used to load code objects.

utils - Utilities required to build the core runtime.

Build environment

CMake build framework is used to build the ROC runtime. The minimum version is 3.5.0.

Obtain cmake infrastructure: http://www.cmake.org/download/

Export cmake bin into your PATH

Package Dependencies

The following support packages are requried to succesfully build the runtime:

• libelf-dev
• g++
• libc6-dev-i386 (for libhsakmt 32bit)

Building the runtime

To build the runtime a compatible version of the libhsakmt library and the hsakmt.h header file must be available. The latest version of these files can be obtained from the ROCT-Thunk-Interface repository, available here:

https://github.com/RadeonOpenCompute/ROCT-Thunk-Interface

Specify the directory containing libhsakmt.so.1 and hsakmt.h using the cmake variable, CMAKE_PREFIX_PATH:

For example, from the top level ROCR repository execute:

mkdir build
cd build
cmake -D CMAKE_PREFIX_PATH=/opt/rocm/libhsakmt \
      ..
make

The location specified here is the default installation directory of the libhsakmt-roct-dev package.

Specs

http://www.hsafoundation.com/standards/

HSA Runtime Specification 1.1

HSA Programmer Reference Manual Specification 1.1

HSA Platform System Architecture Specification 1.1

Runtime Design overview

The AMD ROC runtime consists of three primary layers:

C interface adaptors C++ interfaces classes and common functions AMD device specific implementations Additionally the runtime is dependent on a small utility library which provides simple common functions, limited operating system and compiler abstraction, as well as atomic operation interfaces.

C interface adaptors

Files :

hsa.h(cpp)

hsa_ext_interface.h(cpp)

The C interface layer provides C99 APIs as defined in the HSA Runtime Specification 1.1. The interfaces and default definitions for the standard extensions are also provided. The interface functions simply forward to a function pointer table defined here. The table is initialized to point to default definitions, which simply return an appropriate error code. If available the extension library is loaded as part of runtime initialization and the table is updated to point into the extension library. In this release the standard extensions (image support and finalizer) are implemented in a separate libraries (not open sourced), and can be obtained from the HSA-Runtime-AMD git repository.

C++ interfaces classes and common functions

Files :

runtime.h(cpp)

agent.h

queue.h

signal.h

memory_region.h(cpp)

checked.h

memory_database.h(cpp)

default_signal.h(cpp)

The C++ interface layer provides abstract interface classes encapsulating commands to HSA Signals, Agents, and Queues. This layer also contains the implementation of device independent commands, such as hsa_init and hsa_system_get_info, and a default signal and queue implementation.

Device Specific Implementations

Files:

amd_cpu_agent.h(cpp)

amd_gpu_agent.h(cpp)

amd_hw_aql_command_processor.h(cpp)

amd_memory_region.h(cpp)

amd_memory_registration.h(cpp)

amd_topology.h(cpp)

host_queue.h(cpp)

interrupt_signal.h(cpp)

hsa_ext_private_amd.h(cpp)

The device specific layer contains implementations of the C++ interface classes which implement HSA functionality for ROCm supported devices.

Implemented functionality

• The following queries are not implemented: ** hsa_code_symbol_get_info: HSA_CODE_SYMBOL_INFO_INDIRECT_FUNCTION_CALL_CONVENTION ** hsa_executable_symbol_get_info: HSA_EXECUTABLE_SYMBOL_INFO_INDIRECT_FUNCTION_OBJECT, HSA_EXECUTABLE_SYMBOL_INFO_INDIRECT_FUNCTION_CALL_CONVENTION

Known Issues

• Max total coarse grain region limit is 8GB.
• hsa_agent_get_exception_policies is not implemented.
• Image import/export/copy/fill only support image created with memory from host accessible region.
• hsa_system_get_extension_table is not implemented for HSA_EXTENSION_AMD_PROFILER.

Disclaimer

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