scripts/gdb/linux/vmalloc.py

   1 # SPDX-License-Identifier: GPL-2.0
   2 #
   3 # Copyright (c) 2023 MediaTek Inc.
   4 #
   5 # Authors:
   6 #  Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
   7 #
   8
   9 import gdb
  10 import re
  11 from linux import lists, utils, stackdepot, constants, mm
  12
  13 if constants.LX_CONFIG_MMU:
  14     vmap_area_type = utils.CachedType('struct vmap_area')
  15     vmap_area_ptr_type = vmap_area_type.get_type().pointer()
  16
  17 def is_vmalloc_addr(x):
  18     pg_ops = mm.page_ops().ops
  19     addr = pg_ops.kasan_reset_tag(x)
  20     return addr >= pg_ops.VMALLOC_START and addr < pg_ops.VMALLOC_END
  21
  22 class LxVmallocInfo(gdb.Command):
  23     """Show vmallocinfo"""
  24
  25     def __init__(self):
  26         super(LxVmallocInfo, self).__init__("lx-vmallocinfo", gdb.COMMAND_DATA)
  27
  28     def invoke(self, arg, from_tty):
  29         if not constants.LX_CONFIG_MMU:
  30             raise gdb.GdbError("Requires MMU support")
  31
  32         nr_vmap_nodes = gdb.parse_and_eval('nr_vmap_nodes')
  33         for i in range(0, nr_vmap_nodes):
  34             vn = gdb.parse_and_eval('&vmap_nodes[%d]' % i)
  35             for vmap_area in lists.list_for_each_entry(vn['busy']['head'], vmap_area_ptr_type, "list"):
  36                 if not vmap_area['vm']:
  37                     gdb.write("0x%x-0x%x %10d vm_map_ram\n" % (vmap_area['va_start'], vmap_area['va_end'],
  38                         vmap_area['va_end'] - vmap_area['va_start']))
  39                     continue
  40                 v = vmap_area['vm']
  41                 gdb.write("0x%x-0x%x %10d" % (v['addr'], v['addr'] + v['size'], v['size']))
  42                 if v['caller']:
  43                     gdb.write(" %s" % str(v['caller']).split(' ')[-1])
  44                 if v['nr_pages']:
  45                     gdb.write(" pages=%d" % v['nr_pages'])
  46                 if v['phys_addr']:
  47                     gdb.write(" phys=0x%x" % v['phys_addr'])
  48                 if v['flags'] & constants.LX_VM_IOREMAP:
  49                     gdb.write(" ioremap")
  50                 if v['flags'] & constants.LX_VM_ALLOC:
  51                     gdb.write(" vmalloc")
  52                 if v['flags'] & constants.LX_VM_MAP:
  53                     gdb.write(" vmap")
  54                 if v['flags'] & constants.LX_VM_USERMAP:
  55                     gdb.write(" user")
  56                 if v['flags'] & constants.LX_VM_DMA_COHERENT:
  57                     gdb.write(" dma-coherent")
  58                 if is_vmalloc_addr(v['pages']):
  59                     gdb.write(" vpages")
  60                 gdb.write("\n")
  61
  62 LxVmallocInfo()