config-tools: add 40-acpi-tables.py to board_inspector/extractors

Add a new extractor 40-acpi-tables.py which extracts ioapics basic
information such as: ioapic id, address, gsi base and gsi number.

An example:
  <ioapics>
    <ioapic id="0x2">
      <address>0xfec00000</address>
      <gsi_base>0x0</gsi_base>
      <gsi_number>240</gsi_number>
    </ioapic>
  </ioapics>

Tracked-On: #6986
Signed-off-by: Yang,Yu-chu <yu-chu.yang@intel.com>
Reviewed-by: Junjie Mao <junjie.mao@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>

misc/config_tools/board_inspector/board_inspector.py

@@ -74,6 +74,7 @@ def main(board_name, board_xml, args):
         root_node.append(lxml.etree.Element("processors"))
         root_node.append(lxml.etree.Element("caches"))
         root_node.append(lxml.etree.Element("memory"))
+        root_node.append(lxml.etree.Element("ioapics"))
         root_node.append(lxml.etree.Element("devices"))
 
         extractors_path = os.path.join(script_dir, "extractors")

misc/config_tools/board_inspector/extractors/40-acpi-tables.py

@@ -0,0 +1,59 @@
+# Copyright (C) 2021 Intel Corporation.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+
+import logging
+import re, os, fcntl, errno
+import lxml.etree
+from extractors.helpers import add_child, get_node
+
+from acpiparser import parse_apic, apic
+
+DEFAULT_MAX_IOAPIC_LINES = 240
+
+def extract_gsi_number(ioapic_node, apic_id):
+    f = open("/dev/kmsg", 'r')
+    fd = os.dup(f.fileno())
+    f.close()
+
+    ret = fcntl.fcntl(fd, fcntl.F_SETFL, os.O_NONBLOCK)
+    if ret != 0:
+        os.close(fd)
+        add_child(ioapic_node, "gsi_number", DEFAULT_MAX_IOAPIC_LINES)
+        return
+
+    while True:
+        try:
+            line =  os.read(fd, 512).decode("utf-8")
+            m = re.match(r"\s*\d+,\d+,\d+,-;IOAPIC\[[\d+]\]:\s+apic_id\s+{},\s+version\s+\d+,\s+address\s+0x[0-9a-f]+,\s+GSI\s+(\d+)-(\d+)".format(apic_id), line)
+            if m:
+                previous_max = int(m.group(1))
+                current_max = int(m.group(2)) + 1
+                add_child(ioapic_node, "gsi_number", str(current_max - previous_max))
+                break
+        except:
+            add_child(ioapic_node, "gsi_number", DEFAULT_MAX_IOAPIC_LINES)
+            break
+    os.close(fd)
+
+def extract_topology(ioapics_node, tables):
+    for subtable in tables.interrupt_controller_structures:
+        if subtable.subtype == apic.MADT_TYPE_IO_APIC:
+            apic_id = subtable.io_apic_id
+            ioapic_node = add_child(ioapics_node, "ioapic", None, id=hex(apic_id))
+            add_child(ioapic_node, "address", hex(subtable.io_apic_addr))
+            add_child(ioapic_node, "gsi_base", hex(subtable.global_sys_int_base))
+            extract_gsi_number(ioapic_node, apic_id)
+
+def extract(args, board_etree):
+    try:
+        tables = parse_apic()
+    except Exception as e:
+        logging.warning(f"Parse ACPI tables failed: {str(e)}")
+        logging.warning(f"Will not extract information from ACPI tables")
+        return
+
+    ioapics_node = get_node(board_etree, "//ioapics")
+    extract_topology(ioapics_node, tables)