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 <[email protected]>
   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         vmap_area_list = gdb.parse_and_eval('vmap_area_list')
  33         for vmap_area in lists.list_for_each_entry(vmap_area_list, vmap_area_ptr_type, "list"):
  34             if not vmap_area['vm']:
  35                 gdb.write("0x%x-0x%x %10d vm_map_ram\n" % (vmap_area['va_start'], vmap_area['va_end'],
  36                     vmap_area['va_end'] - vmap_area['va_start']))
  37                 continue
  38             v = vmap_area['vm']
  39             gdb.write("0x%x-0x%x %10d" % (v['addr'], v['addr'] + v['size'], v['size']))
  40             if v['caller']:
  41                 gdb.write(" %s" % str(v['caller']).split(' ')[-1])
  42             if v['nr_pages']:
  43                 gdb.write(" pages=%d" % v['nr_pages'])
  44             if v['phys_addr']:
  45                 gdb.write(" phys=0x%x" % v['phys_addr'])
  46             if v['flags'] & constants.LX_VM_IOREMAP:
  47                 gdb.write(" ioremap")
  48             if v['flags'] & constants.LX_VM_ALLOC:
  49                 gdb.write(" vmalloc")
  50             if v['flags'] & constants.LX_VM_MAP:
  51                 gdb.write(" vmap")
  52             if v['flags'] & constants.LX_VM_USERMAP:
  53                 gdb.write(" user")
  54             if v['flags'] & constants.LX_VM_DMA_COHERENT:
  55                 gdb.write(" dma-coherent")
  56             if is_vmalloc_addr(v['pages']):
  57                 gdb.write(" vpages")
  58             gdb.write("\n")
  59
  60 LxVmallocInfo()