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Add a Documentation/ABI/testing entry describing the AMD PMF util layer character device (/dev/amdpmf_interface) and the initial ioctl used to query feature support and metrics data information. This interface is available when CONFIG_AMD_PMF_UTIL_SUPPORT=y. Also update the MAINTAINERS record with the new UAPI header. Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com> Link: https://patch.msgid.link/20260609081044.2416731-8-Shyam-sundar.S-k@amd.com Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
74 lines
3.0 KiB
Plaintext
74 lines
3.0 KiB
Plaintext
What: /dev/amdpmf_interface
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Date: June 2026
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KernelVersion: 7.2
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Contact: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
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Description:
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The AMD Platform Management Framework (PMF) util layer exposes a
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minimal user-space interface via a character device for feature
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discovery and metrics monitoring.
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When CONFIG_AMD_PMF_UTIL_SUPPORT is enabled, the driver creates
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a character device:
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======================
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/dev/amdpmf_interface
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======================
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The interface supports a single ioctl:
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============================ =======================================
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IOCTL Usage
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IOCTL_AMD_PMF_POPULATE_DATA User passes a struct amd_pmf_info with
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the size field set to sizeof(struct
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amd_pmf_info). The driver returns all
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available metrics and feature status
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in the structure.
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============================ =======================================
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struct amd_pmf_info layout:
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======================= ========== ================================
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Field Type Description
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size __u64 Structure size for versioning
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features_supported __u32 Bitmask of supported features
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platform_type __u32 Platform form factor orientation
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power_source __u32 AC/DC power source
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laptop_placement __u32 Device placement state
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lid_state __u32 Lid open/closed status
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user_presence __u32 User presence detection
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slider_position __u32 Current power slider position
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skin_temp __s32 Skin temperature (centidegrees)
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gfx_busy __u32 Graphics workload percentage
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ambient_light __s32 Ambient light sensor reading
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avg_c0_residency __u32 Average C0 state residency
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max_c0_residency __u32 Maximum C0 state residency
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socket_power __u32 Socket power consumption
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bios_input[10] __u32 Custom BIOS input parameters
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bios_output[10] __u32 Custom BIOS output parameters
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======================= ========== ================================
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Feature Support Flags (features_supported bitmask):
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===================================== ==== =============================
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Flag Bit Description
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AMD_PMF_FEAT_AUTO_MODE 0 Auto Mode feature support
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AMD_PMF_FEAT_STATIC_POWER_SLIDER 1 Static Power Slider support
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AMD_PMF_FEAT_POLICY_BUILDER 2 Policy Builder (Smart PC)
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AMD_PMF_FEAT_DYNAMIC_POWER_SLIDER_AC 3 Dynamic slider on AC
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AMD_PMF_FEAT_DYNAMIC_POWER_SLIDER_DC 4 Dynamic slider on DC
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===================================== ==== =============================
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Return codes:
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============= ============================================================
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Return code Description
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0 Success
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EINVAL Invalid size or parameter
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EFAULT copy_to_user/copy_from_user failures
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ENODEV PMF device not available
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ENOTTY Unknown ioctl command
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============= ============================================================
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User-space tools integrating with AMD PMF to discover capabilities and
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monitor real-time metrics for thermal and power management validation.
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