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AMD's Latest Linux Work

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  • AMD PTDMA Driver Landing For Linux 5.15 After Two Years In The Works - Phoronix

    Going back to September 2019 was work on the AMD PTDMA driver for supporting this controller found on modern AMD processors for high bandwidth memory-to-memory and I/O copy operations. With the Linux 5.15 cycle the AMD PTDMA driver is finally being merged to the mainline kernel.

    AMD EPYC processors feature multiple PTDMA device instances. While the PTDMA controllers have been found in AMD processors already, the upstreaming process has taken two years and gone through more than ten rounds of code review to address outstanding items and other suggestions for improvements.

  • AMD Posts New "AMD-PSTATE" CPUFreq Driver Leveraging CPPC For Better Perf-Per-Watt - Phoronix

    At last! AMD has posted the Linux kernel driver patches for their new "AMD-PSTATE" driver! This driver with modern AMD Zen CPUs (initially limited to Zen 3) to achieve greater performance per Watt / power efficiency on Linux than the conventional ACPI CPUFreq driver.

    The new AMD-PSTATE driver is akin to Intel's P-State driver long used by Intel CPUs as better catering to their hardware than the generic ACPI CPUFreq driver. AMD-PSTATE leverages ACPI Collaborative Processor Performance Controls (CPPC) for making more informed performance state decisions.

  • AMDVLK 2021.Q3.6 Brings New Extensions, Valheim Shader Optimization - Phoronix

    AMDVLK 2021.Q3.6 enables the VK_EXT_load_store_op_none and VK_KHR_zero_initialize_workgroup_memory. VK_EXT_load_store_op_none is an optimization to avoid unnecessary synchronization in certain situations. VK_KHR_zero_initialize_workgroup_memory is used to zero initiative memory for running untrusted content to avoid possible memory-scraping attacks.

  • AMD Branch Sampling Support Being Worked On For Linux - Phoronix

    A new kernel patch series was posted this morning working on AMD Branch Sampling "BRS" support.

    AMD Family 19h "Zen" processors support this branch sampling feature for collecting details on branches taken during code execution. The latest AMD Zen 3 processors do contain improvements to BRS functionality. AMD BRS is detailed within their processor programming reference guides that are public but until now with this new patch series sent out by a Google engineer there hasn't been any Linux support/integration.

AMD shows off their new CPU frequency control mechanism...

  • AMD shows off their new CPU frequency control mechanism for Linux

    Currently limited to Zen 3, AMD has revealed their work on a brand new CPU frequency control mechanism "amd-pstate".

    What's this for then? Well, it was previously announced that AMD along with Valve were working on it with a talk that was presented during the X.Org Developers Conference 2021. Seems this is it and they're ready to properly introduce it.

AMD Finally Releases Overdue Linux CPPC Drive

  • AMD Finally Releases Overdue Linux CPPC Drive

    This is much better than the current generic CPUFreq driver built into Linux, which, as the name states, is generic and isn't fully optimized for AMD processors.

    Phoronix notes that it's taken AMD two full years to finally release this new CPPC driver for Linux. Originally AMD worked on this driver for Zen 2 processors back in 2019, but the company said it didn't have enough resources to finish the driver during that time.

    AMD completed the driver right after Steam announced the Steam Deck with its custom Zen 2 APU and Linux-based Steam OS. AMD made custom adjustments to accommodate thread-targeting specifically for that device, but now it appears that the optimizations have been spread out to all Zen 3 processors in Linux environments.

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