kernel/linux.git/drivers/gpu/drm/amd/include/amdgpu_ptl.h, branch v7.2-rc1

drm/amdgpu: create PTL sysfs after XGMI reset-on-init restore

2026-05-11T19:55:56+00:00

Create PTL sysfs in xgmi_reset_on_init restore path for MINIMAL_XGMI Signed-off-by: Perry Yuan Reviewed-by: Yifan Zhang Signed-off-by: Alex Deucher

drm/amdgpu: add amdgpu.ptl module parameter for PTL control

2026-05-11T19:55:56+00:00

Add a new kernel module parameter 'amdgpu.ptl' to allow users to enable or disable PTL feature at driver loading time. Parameter values: *) 0 or -1: disable PTL (default) *) 1: enable PTL *) 2: permanently disable PTL Signed-off-by: Perry Yuan Reviewed-by: Yifan Zhang Acked-by: Alex Deucher Signed-off-by: Alex Deucher

drm/amdgpu: Track PTL disable requests by source

2026-05-11T19:55:56+00:00

Use a bitmap to track PTL disable requests from sysfs and profiler. PTL is only re-enabled once all sources have released their disable requests, avoiding premature enablement. Signed-off-by: Perry Yuan Reviewed-by: Yifan Zhang Acked-by: Alex Deucher Signed-off-by: Alex Deucher

drm/amdkfd: Add PTL control IOCTL Option and unify refcount logic

2026-05-11T19:55:56+00:00

Introduce a new IOCTL option to allow userspace explicit control over the Peak Tops Limiter (PTL) state for profiling Link: https://github.com/ROCm/rocm-systems/tree/develop/projects/rocprofiler-sdk Signed-off-by: Perry Yuan Reviewed-by: Yifan Zhang Acked-by: Alex Deucher Signed-off-by: Alex Deucher

drm/amdgpu: add sysfs for Peak Tops Limiter (PTL)

2026-05-11T19:55:56+00:00

Add per-GPU sysfs files under /sys/class/drm/cardX/device/ptl to control the Peak Tops Limiter (PTL) feature. Exposes ptl_enable (enable/disable PTL), ptl_format (set/query preferred formats), and ptl_supported_formats (list supported formats) Example usage ------------- Query PTL status: `cat /sys/class/drm/card1/device/ptl/ptl_enable` Enable PTL: `sudo bash -c "echo 1 > /sys/class/drm/card1/device/ptl/ptl_enable"` Disable PTL: `sudo bash -c "echo 0 > /sys/class/drm/card1/device/ptl/ptl_enable"` Set PTL preferred formats: `sudo bash -c "echo I8,F32 > /sys/class/drm/card1/device/ptl/ptl_format"` Query supported formats: `cat /sys/class/drm/card1/device/ptl/ptl_supported_formats` v3 changes: * move N/A to previous format in format show(Alex) * fix format check for format store(Alex) * drop the ptl declarations into amdgpu_ptl.h(Alex) v2 changes: * add usage commands in commit info (Alex) * move amdgpu_ptl_fmt into kgd_kfd_interface.h (Alex) Signed-off-by: Perry Yuan Reviewed-by: Yifan Zhang Acked-by: Alex Deucher Signed-off-by: Alex Deucher

drm/amdgpu: add psp interfaces for peak tops limiter driver

2026-05-11T19:55:55+00:00

Introduce a Peak Tops Limiter (PTL) driver that dynamically caps engine frequency to ensure delivered TOPS never exceeds a defined TOPS_limit. This initial implementation provides core data structures and kernel-space interfaces (set/get, enable/disable) to manage PTL state. PTL performs a firmware handshake to initialize its state and update predefined format types. It supports updating these format types at runtime while user-space tools automatically switch PTL state, and also allows explicitly switching PTL state via newly added commands. Signed-off-by: Perry Yuan Reviewed-by: Lijo Lazar Acked-by: Alex Deucher Signed-off-by: Alex Deucher