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

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 <perry.yuan@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

2 files changed, 51 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/include/amdgpu_ptl.h b/drivers/gpu/drm/amd/include/amdgpu_ptl.h
new file mode 100644
index 000000000000..17e803f4caf8
--- /dev/null
+++ b/drivers/gpu/drm/amd/include/amdgpu_ptl.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2026 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __AMDGPU_PTL_H__
+#define __AMDGPU_PTL_H__
+
+enum amdgpu_ptl_fmt {
+	AMDGPU_PTL_FMT_I8   = 0,
+	AMDGPU_PTL_FMT_F16  = 1,
+	AMDGPU_PTL_FMT_BF16 = 2,
+	AMDGPU_PTL_FMT_F32  = 3,
+	AMDGPU_PTL_FMT_F64  = 4,
+	AMDGPU_PTL_FMT_F8   = 5,
+	AMDGPU_PTL_FMT_VECTOR  = 6,
+	AMDGPU_PTL_FMT_INVALID = 7,
+};
+
+struct amdgpu_ptl {
+	enum amdgpu_ptl_fmt		fmt1;
+	enum amdgpu_ptl_fmt		fmt2;
+	bool				enabled;
+	bool				hw_supported;
+	struct mutex			mutex;
+};
+
+int amdgpu_ptl_perf_monitor_ctrl(struct amdgpu_device *adev, u32 req_code,
+		u32 *ptl_state,
+		enum amdgpu_ptl_fmt *fmt1,
+		enum amdgpu_ptl_fmt *fmt2);
+
+#endif /* __AMDGPU_PTL_H__ */
diff --git a/drivers/gpu/drm/amd/include/kgd_kfd_interface.h b/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
index 9aba8596faa7..6df5afb242ae 100644
--- a/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
+++ b/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
@@ -33,6 +33,7 @@
 #include <linux/dma-fence.h>
 #include "amdgpu_irq.h"
 #include "amdgpu_gfx.h"
+#include "amdgpu_ptl.h"
 
 struct pci_dev;
 struct amdgpu_device;