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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374What: /dev/amdpmf_interfaceDate: June 2026KernelVersion: 7.2Contact: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>Description: The AMD Platform Management Framework (PMF) util layer exposes a minimal user-space interface via a character device for feature discovery and metrics monitoring.
When CONFIG_AMD_PMF_UTIL_SUPPORT is enabled, the driver creates a character device:
====================== /dev/amdpmf_interface ======================
The interface supports a single ioctl:
============================ ======================================= IOCTL Usage IOCTL_AMD_PMF_POPULATE_DATA User passes a struct amd_pmf_info with the size field set to sizeof(struct amd_pmf_info). The driver returns all available metrics and feature status in the structure. ============================ =======================================
struct amd_pmf_info layout:
======================= ========== ================================ Field Type Description size __u64 Structure size for versioning features_supported __u32 Bitmask of supported features platform_type __u32 Platform form factor orientation power_source __u32 AC/DC power source laptop_placement __u32 Device placement state lid_state __u32 Lid open/closed status user_presence __u32 User presence detection slider_position __u32 Current power slider position skin_temp __s32 Skin temperature (centidegrees) gfx_busy __u32 Graphics workload percentage ambient_light __s32 Ambient light sensor reading avg_c0_residency __u32 Average C0 state residency max_c0_residency __u32 Maximum C0 state residency socket_power __u32 Socket power consumption bios_input[10] __u32 Custom BIOS input parameters bios_output[10] __u32 Custom BIOS output parameters ======================= ========== ================================
Feature Support Flags (features_supported bitmask):
===================================== ==== ============================= Flag Bit Description AMD_PMF_FEAT_AUTO_MODE 0 Auto Mode feature support AMD_PMF_FEAT_STATIC_POWER_SLIDER 1 Static Power Slider support AMD_PMF_FEAT_POLICY_BUILDER 2 Policy Builder (Smart PC) AMD_PMF_FEAT_DYNAMIC_POWER_SLIDER_AC 3 Dynamic slider on AC AMD_PMF_FEAT_DYNAMIC_POWER_SLIDER_DC 4 Dynamic slider on DC ===================================== ==== =============================
Return codes:
============= ============================================================ Return code Description 0 Success EINVAL Invalid size or parameter EFAULT copy_to_user/copy_from_user failures ENODEV PMF device not available ENOTTY Unknown ioctl command ============= ============================================================
User-space tools integrating with AMD PMF to discover capabilities and monitor real-time metrics for thermal and power management validation.