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[Data Streaming Accelerator] cr_delta opcode fails on EMR/GNR but works on SPR - is it unsupported?

Minho
Beginner
‎04-11-2025 06:22 AM
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Hi,

I’m currently working on a system that leverages Intel DSA’s `cr_delta` operation.

I’ve observed the following behavior across different generations:

- On **Sapphire Rapids (SPR)**: the `cr_delta` operation works as expected.
- On **Emerald Rapids (EMR)** and **Granite Rapids (GNR)**: attempting to use `cr_delta` results in an "unsupported opcode" error (error code `0x10`).

This suggests that the delta-related opcodes may no longer be supported in EMR/GNR.

However, I couldn’t find any documentation explicitly stating whether these instructions have been deprecated or disabled in newer microarchitectures.

Could anyone clarify:
- Whether `cr_delta` and other delta-related operations are officially supported in EMR/GNR?
- Are there any platform or firmware flags that need to be enabled?

Thanks in advance for your help.

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