[PATCH 08/10] crypto: ccp: Add a sample script for Dynamic Boost Control

[Mario Limonciello]

Dynamic Boost Control is utilized by userspace with a collection
of 2 R/W IOCTLs and 1 W IOCTL. Userspace needs to prepare buffers
with the appropriate signature data and details of the request.

To allow rapid prototyping and testing this interface, add a python3
command line script that can validate the functionality of these
IOCTLs.

NOTE: This script does *not* generate signatures.  They will need to
be prepared separately and passed as arguments.

Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
 tools/crypto/ccp/.gitignore |   1 +
 tools/crypto/ccp/dbc.py     |  98 ++++++++++++++++++++++++++++
 tools/crypto/ccp/dbc_cli.py | 123 ++++++++++++++++++++++++++++++++++++
 3 files changed, 222 insertions(+)
 create mode 100644 tools/crypto/ccp/.gitignore
 create mode 100644 tools/crypto/ccp/dbc.py
 create mode 100755 tools/crypto/ccp/dbc_cli.py

diff --git a/tools/crypto/ccp/.gitignore b/tools/crypto/ccp/.gitignore
new file mode 100644
index 000000000000..bee8a64b79a9
--- /dev/null
+++ b/tools/crypto/ccp/.gitignore
@@ -0,0 +1 @@
+__pycache__
diff --git a/tools/crypto/ccp/dbc.py b/tools/crypto/ccp/dbc.py
new file mode 100644
index 000000000000..f1b7342060b1
--- /dev/null
+++ b/tools/crypto/ccp/dbc.py
@@ -0,0 +1,98 @@
+#!/usr/bin/python3
+# SPDX-License-Identifier: GPL-2.0
+
+from ioctl_opt import IOWR, IOW
+import ctypes
+import fcntl
+
+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"
+
+
+class _dbc_get_nonce(ctypes.Structure):
+    _fields_ = [
+        ("auth_needed", ctypes.c_uint32),
+        ("nonce", ctypes.c_uint8 * DBC_NONCE_SIZE),
+        ("signature", ctypes.c_uint8 * DBC_SIG_SIZE),
+    ]
+
+
+class _dbc_set_uid(ctypes.Structure):
+    _fields_ = [
+        ("uid", ctypes.c_uint8 * DBC_UID_SIZE),
+        ("signature", ctypes.c_uint8 * DBC_SIG_SIZE),
+    ]
+
+
+class _dbc_param(ctypes.Structure):
+    _fields_ = [
+        ("msg_index", ctypes.c_uint32),
+        ("parameter", ctypes.c_uint32),
+        ("signature", ctypes.c_uint8 * DBC_SIG_SIZE),
+    ]
+
+
+DBCIOCNONCE = IOWR(ord("D"), 0x01, _dbc_get_nonce)
+DBCIOCUID = IOW(ord("D"), 0x02, _dbc_set_uid)
+DBCIOCPARAM = IOWR(ord("D"), 0x03, _dbc_param)
+
+
+def get_nonce(device, signature):
+    nonce = _dbc_get_nonce()
+    if signature:
+        nonce.auth_needed = 1
+        tmp = ctypes.c_ubyte * len(signature)
+        nonce.signature = tmp.from_buffer_copy(bytes(signature, "ascii"))
+    result = fcntl.ioctl(device, DBCIOCNONCE, nonce, True)
+    if result < 0:
+        raise IOError(result)
+    return nonce
+
+
+def set_uid(device, new_uid, signature):
+    uid = _dbc_set_uid()
+    if not signature:
+        raise ValueError("Signature required")
+    if not new_uid:
+        raise ValueError("UID required")
+    tmp = ctypes.c_ubyte * len(signature)
+    tmp2 = ctypes.c_ubyte * len(new_uid)
+    uid.signature = tmp.from_buffer_copy(bytes(signature, "ascii"))
+    uid.uid = tmp2.from_buffer_copy(bytes(new_uid, "ascii"))
+    result = fcntl.ioctl(device, DBCIOCUID, uid, True)
+    if result < 0:
+        raise IOError(result)
+    return True
+
+
+def process_param(device, message, signature, data=None):
+    param = _dbc_param()
+    if not signature:
+        raise ValueError("Signature required")
+    if type(message) != tuple:
+        raise ValueError("Expected message tuple")
+    tmp = ctypes.c_ubyte * len(signature)
+    param.signature = tmp.from_buffer_copy(bytes(signature, "ascii"))
+    param.msg_index = message[0]
+    if data:
+        param.parameter = data
+    result = fcntl.ioctl(device, DBCIOCPARAM, param, True)
+    if result < 0:
+        raise IOError(result)
+    return param
diff --git a/tools/crypto/ccp/dbc_cli.py b/tools/crypto/ccp/dbc_cli.py
new file mode 100755
index 000000000000..2dbefc2b7ed3
--- /dev/null
+++ b/tools/crypto/ccp/dbc_cli.py
@@ -0,0 +1,123 @@
+#!/usr/bin/python3
+# SPDX-License-Identifier: GPL-2.0
+import argparse
+import binascii
+import os
+import errno
+from dbc import *
+
+ERRORS = {
+    errno.EACCES: "Access is denied",
+    errno.E2BIG: "Excess data provided",
+    errno.EINVAL: "Bad parameters",
+    errno.EAGAIN: "Bad state",
+    errno.ENOENT: "Not implemented or message failure",
+    errno.EBUSY: "Busy",
+    errno.ENFILE: "Overflow",
+    errno.EPERM: "Signature invalid",
+}
+
+messages = {
+    "get-fmax-cap": PARAM_GET_FMAX_CAP,
+    "set-fmax-cap": PARAM_SET_FMAX_CAP,
+    "get-power-cap": PARAM_GET_PWR_CAP,
+    "set-power-cap": PARAM_SET_PWR_CAP,
+    "get-graphics-mode": PARAM_GET_GFX_MODE,
+    "set-graphics-mode": PARAM_SET_GFX_MODE,
+    "get-current-temp": PARAM_GET_CURR_TEMP,
+    "get-fmax-max": PARAM_GET_FMAX_MAX,
+    "get-fmax-min": PARAM_GET_FMAX_MAX,
+    "get-soc-power-max": PARAM_GET_SOC_PWR_MAX,
+    "get-soc-power-min": PARAM_GET_SOC_PWR_MIN,
+    "get-soc-power-cur": PARAM_GET_SOC_PWR_CUR,
+}
+
+
+def _pretty_buffer(ba):
+    return str(binascii.hexlify(ba, " "))
+
+
+def parse_args():
+    parser = argparse.ArgumentParser(
+        description="Dynamic Boost control command line interface"
+    )
+    parser.add_argument(
+        "command",
+        choices=["get-nonce", "get-param", "set-param", "set-uid"],
+        help="Command to send",
+    )
+    parser.add_argument("--device", default="/dev/dbc", help="Device to operate")
+    parser.add_argument("--signature", help="Signature for command")
+    parser.add_argument("--message", choices=messages.keys(), help="Message index")
+    parser.add_argument("--data", help="Argument to pass to message")
+    parser.add_argument("--uid", help="UID to pass")
+    return parser.parse_args()
+
+
+def pretty_error(code):
+    if code in ERRORS:
+        print(ERRORS[code])
+    else:
+        print("failed with return code %d" % code)
+
+
+if __name__ == "__main__":
+    args = parse_args()
+    data = 0
+    if not os.path.exists(args.device):
+        raise IOError("Missing device {device}".format(device=args.device))
+    if args.signature and len(args.signature) != DBC_SIG_SIZE:
+        raise ValueError(
+            "Invalid signature length %d (expected %d)"
+            % (len(args.signature), DBC_SIG_SIZE)
+        )
+    if args.uid and len(args.uid) != DBC_UID_SIZE:
+        raise ValueError(
+            "Invalid UID length %d (expected %d)" % (len(args.uid), DBC_UID_SIZE)
+        )
+    if args.data:
+        try:
+            data = int(args.data, 10)
+        except ValueError:
+            data = int(args.data, 16)
+
+    with open(args.device) as d:
+        if args.command == "get-nonce":
+            try:
+                nonce = get_nonce(d, args.signature)
+                print("Nonce: %s" % _pretty_buffer(bytes(nonce.nonce)))
+            except OSError as e:
+                pretty_error(e.errno)
+        elif args.command == "set-uid":
+            try:
+                result = set_uid(d, args.uid, args.signature)
+                if result:
+                    print("Set UID")
+            except OSError as e:
+                pretty_error(e.errno)
+        elif args.command == "get-param":
+            if not args.message or args.message.startswith("set"):
+                raise ValueError("Invalid message %s" % args.message)
+            try:
+                param = process_param(d, messages[args.message], args.signature)
+                print(
+                    "Parameter: {par}, response signature {sig}".format(
+                        par=param.parameter,
+                        sig=_pretty_buffer(bytes(param.signature)),
+                    )
+                )
+            except OSError as e:
+                pretty_error(e.errno)
+        elif args.command == "set-param":
+            if not args.message or args.message.startswith("get"):
+                raise ValueError("Invalid message %s" % args.message)
+            try:
+                param = process_param(d, messages[args.message], args.signature, data)
+                print(
+                    "Parameter: {par}, response signature {sig}".format(
+                        par=param.parameter,
+                        sig=_pretty_buffer(bytes(param.signature)),
+                    )
+                )
+            except OSError as e:
+                pretty_error(e.errno)
-- 
2.34.1