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Adding documentation for SDMA environment var

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Adding documentation for modifiers for SDMA copy

Change-Id: I2425672c3ba1f1617d29b8f4b49776775d78a376


[ROCm/ROCR-Runtime commit: a7ffddb265]
This commit is contained in:
David Yat Sin
2023-07-20 11:09:09 -04:00
parent 9fda38f0ba
commit 56ccf828bc
1 changed files with 20 additions and 0 deletions
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projects/rocr-runtime/runtime/hsa-runtime/README.md
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@@ -214,6 +214,26 @@ which implement HSA functionality for ROCm supported devices.
* `hsa_system_get_extension_table` is not implemented for * `hsa_system_get_extension_table` is not implemented for
`HSA_EXTENSION_AMD_PROFILER`. `HSA_EXTENSION_AMD_PROFILER`.
## Environment Variables
### HSA_ENABLE_SDMA
Possible values:
* 0:Disabled
* 1:Enabled (Default Value)
This will enable or disable the use of DMA engines in all copy directions (Host-to-Device, Device-to-Host, Device-to-Device) when using the following APIs:
`hsa_memory_copy`, `hsa_amd_memory_fill`, `hsa_amd_memory_async_copy`, `hsa_amd_memory_async_copy_on_engine`
### HSA_ENABLE_PEER_SDMA
Possible values:
* 0:Disabled
* 1:Enabled (Default Value)
This will enable or disable the use of DMA engines for Device-to-Device copies when using the following APIs:
`hsa_memory_copy`, `hsa_amd_memory_async_copy`, `hsa_amd_memory_async_copy_on_engine`
The value of `HSA_ENABLE_PEER_SDMA` is ignored if `HSA_ENABLE_SDMA` is used to disable the use of DMA engines.
## Disclaimer ## Disclaimer
The information contained herein is for informational purposes only, and is The information contained herein is for informational purposes only, and is