Summary:
We have the ability to schedule callbacks after certain events complete.
Currently we can register an arbitrary callback in CUDA, but can't in
AMDGPU. I am planning on using this support to move the RPC handling to
a separate thread, then using these callbacks to suspend / resume it
when no kernels are running. This is a preliminary patch to keep this
noise out of that one.
We had three `utils::` namespaces, all with different "meaning" (host,
device, hsa_utils). We should, when we can, keep "include/Shared"
accessible from host and device, thus RefCountTy has been moved to a
separate header. `hsa_utils` was introduced to make `utils::` less
overloaded. And common functionality was de-duplicated, e.g.,
`utils::advance` and `utils::advanceVoidPtr` -> `utils:advancePtr`. Type
punning now checks for the size of the result to make sure it matches
the source type.
No functional change was intended.
Since we can already track allocations, we can diagnose memory faults to
some degree. If the fault happens in a prior allocation (use after free)
or "close but outside" one, we can provide that information to the user.
Note that the fault address might be page aligned, and not all accesses
trigger a fault, especially for allocations that are backed by a
MemoryManager. Still, if people disable the MemoryManager or the
allocation is big enough, we can sometimes provide valueable feedback.
This patch moves utilities from
`offload/plugins-nextgen/amdgpu/utils/UtilitiesRTL.h` to
`llvm/Frontend/Offloading/Utility.h` to be reused by
other projects.
Concretely the following changes were made:
- Rename `KernelMetaDataTy` to `AMDGPUKernelMetaData`.
- Remove unused fields `KernelObject`, `KernelSegmentSize`,
`ExplicitArgumentCount` and `ImplicitArgumentCount` from
`AMDGPUKernelMetaData`.
- Return the produced error if `ELFObj.sections()` failed instead of
using `cantFail`.
- Added `AGPRCount` field to `AMDGPUKernelMetaData`.
- Added a default invalid value to all the fields in
`AMDGPUKernelMetaData`.
Similar to (de)allocation traces, we can record kernel launch stack
traces and display them in case of an error. However, the AMD GPU plugin
signal handler, which is invoked on memroy faults, cannot pinpoint the
offending kernel. Insteade print `<NUM>`, set via
`OFFLOAD_TRACK_NUM_KERNEL_LAUNCH_TRACES=<NUM>`, many traces. The
recoding/record uses a ring buffer of fixed size (for now 8).
For `trap` errors, we print the actual kernel name, and trace if
recorded.
Summary:
The HSA headers existed previously in `include/hsa.h` and were moved to
`include/hsa/hsa.h` in a later ROCm version. The include headers here
were originally designed to favor a newer one. However, this
unintentionally prevented the dyanmic HSA's `hsa.h` from being used if
both were present. This patch changes the order so it will be found
first.
Related to https://github.com/llvm/llvm-project/pull/95484.
We already used a flat array of kernel launch parameters for the AMD GPU
launch but now we also use this scheme for the NVIDIA GPU launch. The
only remaining/required use of the indirection is the host plugin (due
ot ffi). This allows to us simplify the use for non-OpenMP kernel
launch.
COV3 is not supported anymore, thus we can just use ArgsSize we read
from the kernel to determine how many argument bytes we need and if
implicit kernel arguments are used.
Summary:
The old COV3 implementation of HSA used to omit the implicit arguments
from the kernel argument size. For COV4 and COV5 this is no longer the
case so we can simply use the size reported from the symbol information.
See
https://github.com/ROCm/ROCR-Runtime/issues/117#issuecomment-812758161
Summary:
Currently, we register images into a linear table according to the
logical OpenMP device identifier. We then initialize all of these images
as one block. This logic requires that images are compatible with *all*
devices instead of just the one that it can run on. This prevents us
from running on systems with heterogeneous devices (i.e. image 1 runs on
device 0 image 0 runs on device 1).
This patch reworks the logic by instead making the compatibility check a
per-device query. We then scan every device to see if it's compatible
and do it as they come.
Summary:
The logic since the next-gen plugins was added was that every single
agent would get access to a memory pool we allocated. This is necessary
for things like fine-grained memory and to faciliate d2d copied.
However, there are cases where an agent cannot legally access a memory
pool. We have a debug check for this, but it would always be triggered
in these situations because both uses of the function simply passed
every agent. This patch changes the behavior by only enabling memory
pool access for agents that can access the memory pool.
This patch overhauls the `libomptarget` and plugin interface. Currently,
we define a C API and compile each plugin as a separate shared library.
Then, `libomptarget` loads these API functions and forwards its internal
calls to them. This was originally designed to allow multiple
implementations of a library to be live. However, since then no one has
used this functionality and it prevents us from using much nicer
interfaces. If the old behavior is desired it should instead be
implemented as a separate plugin.
This patch replaces the `PluginAdaptorTy` interface with the
`GenericPluginTy` that is used by the plugins. Each plugin exports a
`createPlugin_<name>` function that is used to get the specific
implementation. This code is now shared with `libomptarget`.
There are some notable improvements to this.
1. Massively improved lifetimes of life runtime objects
2. The plugins can use a C++ interface
3. Global state does not need to be duplicated for each plugin +
libomptarget
4. Easier to use and add features and improve error handling
5. Less function call overhead / Improved LTO performance.
Additional changes in this plugin are related to contending with the
fact that state is now shared. Initialization and deinitialization is
now handled correctly and in phase with the underlying runtime, allowing
us to actually know when something is getting deallocated.
Depends on https://github.com/llvm/llvm-project/pull/86971https://github.com/llvm/llvm-project/pull/86875https://github.com/llvm/llvm-project/pull/86868
This patch overhauls the `libomptarget` and plugin interface. Currently,
we define a C API and compile each plugin as a separate shared library.
Then, `libomptarget` loads these API functions and forwards its internal
calls to them. This was originally designed to allow multiple
implementations of a library to be live. However, since then no one has
used this functionality and it prevents us from using much nicer
interfaces. If the old behavior is desired it should instead be
implemented as a separate plugin.
This patch replaces the `PluginAdaptorTy` interface with the
`GenericPluginTy` that is used by the plugins. Each plugin exports a
`createPlugin_<name>` function that is used to get the specific
implementation. This code is now shared with `libomptarget`.
There are some notable improvements to this.
1. Massively improved lifetimes of life runtime objects
2. The plugins can use a C++ interface
3. Global state does not need to be duplicated for each plugin +
libomptarget
4. Easier to use and add features and improve error handling
5. Less function call overhead / Improved LTO performance.
Additional changes in this plugin are related to contending with the
fact that state is now shared. Initialization and deinitialization is
now handled correctly and in phase with the underlying runtime, allowing
us to actually know when something is getting deallocated.
Depends on https://github.com/llvm/llvm-project/pull/86971https://github.com/llvm/llvm-project/pull/86875https://github.com/llvm/llvm-project/pull/86868
In a nutshell, this moves our libomptarget code to populate the offload
subproject.
With this commit, users need to enable the new LLVM/Offload subproject
as a runtime in their cmake configuration.
No further changes are expected for downstream code.
Tests and other components still depend on OpenMP and have also not been
renamed. The results below are for a build in which OpenMP and Offload
are enabled runtimes. In addition to the pure `git mv`, we needed to
adjust some CMake files. Nothing is intended to change semantics.
```
ninja check-offload
```
Works with the X86 and AMDGPU offload tests
```
ninja check-openmp
```
Still works but doesn't build offload tests anymore.
```
ls install/lib
```
Shows all expected libraries, incl.
- `libomptarget.devicertl.a`
- `libomptarget-nvptx-sm_90.bc`
- `libomptarget.rtl.amdgpu.so` -> `libomptarget.rtl.amdgpu.so.18git`
- `libomptarget.so` -> `libomptarget.so.18git`
Fixes: https://github.com/llvm/llvm-project/issues/75124
---------
Co-authored-by: Saiyedul Islam <Saiyedul.Islam@amd.com>
