util/arm_einj.py: add an utility for ARM error injection via QEMU

Testing rasdaemon is not easy, as it depends on either having
real hardware producing events or a test BIOS. This is usually
not available and/or not too reliable.

So, take a different approach by adding a QEMU QAPI designed for
doing hardware error injection. The QEMU patches are at:

	https://gitlab.com/mchehab_kernel/qemu/-/tree/arm-error-inject-v2

And some instructions about how to use it are at rasdaemon wiki
pages at github:

	https://github.com/mchehab/rasdaemon/wiki

Add the error injection tool to rasdaemon sources.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

util/arm_einj.py

@@ -0,0 +1,365 @@
+#!/usr/bin/env python3
+#
+# pylint: disable=C0301, C0114
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (C) 2024  Mauro Carvalho Chehab <mchehab@kernel.org>
+
+import argparse
+import json
+import socket
+import sys
+
+einj_description= """
+Do UEFI CPER firmware-first error injections via QEMU.
+
+This small utility works together with those QEMU additions:
+   https://gitlab.com/mchehab_kernel/qemu/-/tree/arm-error-inject-v2
+
+It allows using UEFI BIOS EINJ features on ARM32/64 emulation to do ARM
+processor error injection, to be decoded by Linux CPER and GHES drivers,
+helping to test rasdaemon firmware-first error handling for ARM processor
+events, being compatible with UEFI 2.9A Errata.
+"""
+
+
+# Valid choice values
+ARM_valid_bits = {
+    "mpidr": "mpidr-valid",
+    "affinity": "affinity-valid",
+    "running": "running-state-valid",
+    "vendor": "vendor-specific-valid"
+}
+
+PEI_flags = {
+    "first": "first-error-cap",
+    "last": "last-error-cap",
+    "propagated": "propagated",
+    "overflow": "overflow",
+}
+
+PEI_error_types = {
+    "cache": "cache-error",
+    "tlb": "tlb-error",
+    "bus": "bus-error",
+    "micro-arch": "micro-arch-error",
+    "vendor": "micro-arch-error"
+}
+
+PEI_valid_bits = {
+    "multiple-error": "multiple-error-valid",
+    "flags": "flags-valid",
+    "error": "error-info-valid",
+    "virt": "virt-addr-valid",
+    "virtual": "virt-addr-valid",
+    "phy": "phy-addr-valid",
+    "physical": "phy-addr-valid"
+}
+
+def einj_command(host, port, commands):
+    """Send commands to QEMU though QMP TCP socket"""
+
+    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    s.connect((host, port))
+
+    data = s.recv(1024)
+
+    print("\t", data.decode('utf-8'), end="")
+
+    for command in commands:
+        print(command)
+
+        s.sendall(command.encode('utf-8'))
+        data = s.recv(1024)
+        print("\t", data.decode('utf-8'), end="")
+
+    s.shutdown(socket.SHUT_WR)
+    while 1:
+        data = s.recv(1024)
+        if data == b"":
+            break
+        print("\t", data.decode('utf-8'))
+
+    s.close()
+
+def get_choice(name, value, choices, suffixes=None):
+    new_values = []
+
+    if not value:
+        return new_values
+
+    for val in value.split(","):
+        val = val.lower()
+
+        if suffixes:
+            for suffix in suffixes:
+                val = val.removesuffix(suffix)
+
+        if val not in choices.keys():
+            sys.exit(f"Error on '{name}': choice {val} is invalid.")
+
+        val = choices[val]
+
+        new_values.append(val)
+
+    return new_values
+
+def get_mult_array(mult, name, values, allow_zero=False, max_val=None):
+    if not allow_zero:
+        if not values:
+            return
+    else:
+        if values is None:
+            return
+        elif not values:
+            i = 0
+            if i not in mult:
+                mult[i] = {}
+
+            mult[i][name]=[]
+            return
+
+    i = 0
+    for value in values:
+        for val in value.split(","):
+            try:
+                val = int(val, 0)
+            except:
+                sys.exit(f"Error on '{name}': {val} is not an integer")
+
+            if val < 0:
+                sys.exit(f"Error on '{name}': {val} is not unsigned")
+
+            if max_val and val > max_val:
+                sys.exit(f"Error on '{name}': {val} is too big")
+
+            if i not in mult:
+                mult[i] = {}
+
+            if name not in mult[i]:
+                mult[i][name] = []
+
+            mult[i][name].append(val)
+
+        i += 1
+
+def get_mult_choices(mult, name, values, choices,
+                     suffixes = None, allow_zero=False):
+    if not allow_zero:
+        if not values:
+            return
+    else:
+        if values is None:
+            return
+
+    i = 0
+    for val in values:
+        new_values = get_choice(name, val, choices, suffixes)
+
+        if i not in mult:
+            mult[i] = {}
+
+        mult[i][name] = new_values
+        i += 1
+
+def get_mult_int(mult, name, values, allow_zero=False):
+    if not allow_zero:
+        if not values:
+            return
+    else:
+        if values is None:
+            return
+
+    i = 0
+    for val in values:
+        try:
+            val = int(val, 0)
+        except:
+            sys.exit(f"Error on '{name}': {val} is not an integer")
+
+        if val < 0:
+            sys.exit(f"Error on '{name}': {val} is not unsigned")
+
+        if i not in mult:
+            mult[i] = {}
+
+        mult[i][name] = val
+        i += 1
+
+class errorInjection:
+    def __init__(self, args=None, arm=None):
+
+        """Initialize the error injection class. There are two possible
+           ways to initialize it:
+           1. passing a set of arguments;
+           2. passing a dict with error inject command parameters. Each
+              column is handled in separate."""
+
+        self.arm = {}
+
+        if not args:
+            self.args = args
+            return
+
+        print("ARGS:", args)
+
+        pei = {}
+        ctx = {}
+        vendor = {}
+
+        # Handle global parameters
+        if args.arm:
+            self.arm["validation"] = get_choice(name="validation", value=args.arm,
+                                                choices=ARM_valid_bits,
+                                                suffixes=["-error", "-err"])
+
+        if args.affinity:
+            self.arm["affinity-level"] = args.affinity
+
+        if args.mpidr:
+            self.arm["mpidr-el1"] = args.mpidr
+
+        if args.midr:
+            self.arm["midr-el1"] = args.midr
+
+        if args.running is not None:
+            if args.running:
+                self.arm["running-state"] = ["processor-running"]
+            else:
+                self.arm["running-state"] = []
+
+        if args.psci:
+            self.arm["psci-state"] = args.psci
+
+
+        # Handle PEI
+        if not args.type:
+            args.type = ['cache-error']
+
+        get_mult_choices(pei, name="validation", values=args.pei_valid,
+                        choices=PEI_valid_bits,
+                        suffixes=["-valid", "-info", "--information", "--addr"])
+        get_mult_choices(pei, name="type", values=args.type,
+                        choices=PEI_error_types,
+                        suffixes=["-error", "-err"])
+        get_mult_choices(pei, name="flags", values=args.flags,
+                        choices=PEI_flags,
+                        suffixes=["-error", "-cap"])
+        get_mult_int(pei, "multiple-error", args.multiple_error)
+        get_mult_int(pei, "phy-addr", args.physical_address)
+        get_mult_int(pei, "vir-addr", args.virtual_address)
+
+        # Handle context
+        get_mult_int(ctx, "type", args.ctx_type, allow_zero=True)
+        get_mult_int(ctx, "minimal-size", args.ctx_size, allow_zero=True)
+        get_mult_array(ctx, "register", args.ctx_array, allow_zero=True)
+
+        get_mult_array(vendor, "bytes", args.vendor, max_val=255)
+
+        # Store PEI
+        self.arm["error"] = []
+        for k in sorted(pei.keys()):
+            self.arm["error"].append(pei[k])
+
+        # Store Context
+        if ctx:
+            self.arm["context"] = []
+            for k in sorted(ctx.keys()):
+                self.arm["context"].append(ctx[k])
+
+        # Vendor-specific bytes are not grouped
+        if vendor:
+            self.arm["vendor-specific"] = []
+            for k in sorted(vendor.keys()):
+                self.arm["vendor-specific"] += vendor[k]["bytes"]
+
+    def run(self, host, port):
+
+        # Fill the commands to be sent
+        commands = []
+
+        # Needed to negotiate QMP and for QEMU to accept the command
+        commands.append('{ "execute": "qmp_capabilities" } ')
+
+        command = '{ "execute": "arm-inject-error", '
+        command += '"arguments": ' + json.dumps(self.arm) + ' }'
+
+        commands.append(command)
+
+        einj_command(host, port, commands)
+
+
+def handle_args():
+    parser = argparse.ArgumentParser(prog="einj.py",
+                                     usage="%(prog)s [options]",
+                                     description=einj_description,
+                                     epilog="If a field is not defined, a default value will be applied by QEMU.")
+
+    # TCP QEMU QMP host/port
+    g_options = parser.add_argument_group("Socket options")
+    g_options.add_argument("-H", "--host", default="localhost", type=str,
+                           help="host name")
+    g_options.add_argument("-P", "--port", default=4445, type=int,
+                           help="TCP port number")
+
+    # UEFI N.16 ARM Validation bits
+    g_arm = parser.add_argument_group("ARM processor")
+    g_arm.add_argument("--arm", "--arm-valid",
+                       help="ARM validation bits: mpidr,affinity,running,vendor")
+    g_arm.add_argument("-a", "--affinity",  "--level", "--affinity-level", type=lambda x: int(x, 0),
+                       help="Affinity level (when multiple levels apply)")
+    g_arm.add_argument("-l", "--mpidr", type=lambda x: int(x, 0),
+                       help="Multiprocessor Affinity Register")
+    g_arm.add_argument("-i", "--midr", type=lambda x: int(x, 0),
+                       help="Main ID Register")
+    g_arm.add_argument("-r", "--running",
+                       action=argparse.BooleanOptionalAction, default=None,
+                       help="Indicates if the processor is running or not")
+    g_arm.add_argument("--psci", "--psci-state", type=lambda x: int(x, 0),
+                       help="Power State Coordination Interface - PSCI state")
+
+    # TODO: Add vendor-specific support
+
+    # UEFI N.17 bitmaps (type and flags)
+    g_pei = parser.add_argument_group("ARM Processor Error Info (PEI)")
+    g_pei.add_argument("-t", "--type", nargs="+",
+                       help="one or more error types: cache,tlb,bus,vendor")
+    g_pei.add_argument("-f", "--flags", nargs="*",
+                       help="zero or more error flags: first-error,last-error,propagated,overflow")
+    g_arm.add_argument("-V", "--pei-valid", "--error-valid", nargs="*",
+                       help="zero or more PEI validation bits: multiple-error,flags,error-info,virt,phy")
+
+    # UEFI N.17 Integer values
+    g_pei.add_argument("-m", "--multiple-error", nargs="+",
+                       help="Number of errors: 0: Single error, 1: Multiple errors, 2-65535: Error count if known")
+    g_pei.add_argument("-e", "--error-info", nargs="+",
+                       help="Error information (UEFI 2.10 tables N.18 to N.20)")
+    g_pei.add_argument("-p", "--physical-address",  nargs="+",
+                       help="Physical address")
+    g_pei.add_argument("-v", "--virtual-address",  nargs="+",
+                       help="Virtual address")
+
+    # UEFI N.21 Context
+    g_pei.add_argument("--ctx-type", "--context-type", nargs="*",
+                       help="Type of the context (0=ARM32 GPR, 5=ARM64 EL1, other values supported)")
+    g_pei.add_argument("--ctx-size", "--context-size", nargs="*",
+                       help="Minimal size of the context")
+    g_pei.add_argument("--ctx-array", "--context-array", nargs="*",
+                       help="Comma-separated arrays for each context")
+
+    # Vendor-specific data
+    g_pei.add_argument("--vendor", "--vendor-specific", nargs="+",
+                       help="Vendor-specific byte arrays of data")
+
+    return parser.parse_args()
+
+def main():
+    """Main program"""
+
+    args = handle_args()
+
+    einj = errorInjection(args)
+    einj.run(args.host, args.port)
+
+if __name__ == '__main__':
+    main()