crypto: ccp - Add a sample python script for Dynamic Boost Control

Dynamic Boost Control commands are triggered by userspace with
an IOCTL interface that userspace will prepare proper buffers
for a request.

To allow prototyping and testing this interface, add a python3
command line script that loads the dbc_library.so for utilizing
the IOCTLs.

The signature to use and UID are passed as arguments to this script.

Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 64 insertions, 0 deletions

diff --git a/tools/crypto/ccp/dbc.py b/tools/crypto/ccp/dbc.py
new file mode 100644
index 000000000000..3f6a825ffc9e
--- /dev/null
+++ b/tools/crypto/ccp/dbc.py
@@ -0,0 +1,64 @@
+#!/usr/bin/python3
+# SPDX-License-Identifier: GPL-2.0
+
+import ctypes
+import os
+
+DBC_UID_SIZE = 16
+DBC_NONCE_SIZE = 16
+DBC_SIG_SIZE = 32
+
+PARAM_GET_FMAX_CAP = (0x3,)
+PARAM_SET_FMAX_CAP = (0x4,)
+PARAM_GET_PWR_CAP = (0x5,)
+PARAM_SET_PWR_CAP = (0x6,)
+PARAM_GET_GFX_MODE = (0x7,)
+PARAM_SET_GFX_MODE = (0x8,)
+PARAM_GET_CURR_TEMP = (0x9,)
+PARAM_GET_FMAX_MAX = (0xA,)
+PARAM_GET_FMAX_MIN = (0xB,)
+PARAM_GET_SOC_PWR_MAX = (0xC,)
+PARAM_GET_SOC_PWR_MIN = (0xD,)
+PARAM_GET_SOC_PWR_CUR = (0xE,)
+
+DEVICE_NODE = "/dev/dbc"
+
+lib = ctypes.CDLL("./dbc_library.so", mode=ctypes.RTLD_GLOBAL)
+
+
+def handle_error(code):
+    val = code * -1
+    raise OSError(val, os.strerror(val))
+
+
+def get_nonce(device, signature):
+    if not device:
+        raise ValueError("Device required")
+    buf = ctypes.create_string_buffer(DBC_NONCE_SIZE)
+    ret = lib.get_nonce(device.fileno(), ctypes.byref(buf), signature)
+    if ret:
+        handle_error(ret)
+    return buf.value
+
+
+def set_uid(device, new_uid, signature):
+    if not signature:
+        raise ValueError("Signature required")
+    if not new_uid:
+        raise ValueError("UID required")
+    ret = lib.set_uid(device.fileno(), new_uid, signature)
+    if ret:
+        handle_error(ret)
+    return True
+
+
+def process_param(device, message, signature, data=None):
+    if not signature:
+        raise ValueError("Signature required")
+    if type(message) != tuple:
+        raise ValueError("Expected message tuple")
+    arg = ctypes.c_int(data if data else 0)
+    ret = lib.process_param(device.fileno(), message[0], signature, ctypes.pointer(arg))
+    if ret:
+        handle_error(ret)
+    return arg, signature