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#!/usr/bin/env drgn
# Copyright (c) Canonical Ltd.
# SPDX-License-Identifier: LGPL-2.1-or-later
""" Script to dump vmallocinfo status using drgn"""
import re
from typing import Optional
from drgn import IntegerLike, Program
from drgn.helpers.linux.mm import for_each_vmap_area
VMAP_RAM = 0x1 # indicates vm_map_ram area
VM_IOREMAP = 0x00000001 # ioremap() and friends
VM_ALLOC = 0x00000002 # vmalloc()
VM_MAP = 0x00000004 # vmap()ed pages
VM_USERMAP = 0x00000008 # suitable for remap_vmalloc_range
VM_DMA_COHERENT = 0x00000010 # dma_alloc_coherent
VM_SPARSE = 0x00001000 # sparse vm_area. not all pages are present.
def is_vmalloc_addr(prog: Program, addr: IntegerLike) -> Optional[bool]:
vmcoreinfo = prog["VMCOREINFO"].string_()
match = re.search(
rb"^NUMBER\(VMALLOC_START\)=(0x[0-9a-f]+)$", vmcoreinfo, flags=re.M
)
if match:
VMALLOC_START = int(match.group(1), 16)
match = re.search(rb"^NUMBER\(VMALLOC_END\)=(0x[0-9a-f]+)$", vmcoreinfo, flags=re.M)
if match:
VMALLOC_END = int(match.group(1), 16)
try:
return True if addr >= VMALLOC_START and addr < VMALLOC_END else False
except:
return None
for vmap_area in for_each_vmap_area(prog):
if not vmap_area.vm:
if vmap_area.flags & VMAP_RAM:
print(
f"0x{vmap_area.va_start:x}-0x{vmap_area.va_end:x} {vmap_area.va_end - vmap_area.va_start:10d} vm_map_ram"
)
continue
v = vmap_area.vm
print(
f"0x{v.addr.value_():x}-0x{(v.addr+v.size).value_():x} {v.size.value_():10d}",
end="",
)
if v.caller:
try:
print(f" {prog.symbol(v.caller.value_()).name}", end="")
except LookupError:
print(f" 0x{v.caller.value_():x}", end="")
if v.nr_pages:
print(f" pages={v.nr_pages.value_():d}", end="")
if v.phys_addr:
print(f" phys=0x{v.phys_addr.value_():x}", end="")
if v.flags & VM_IOREMAP:
print(" ioremap", end="")
if v.flags & VM_SPARSE:
print(" sparse", end="")
if v.flags & VM_ALLOC:
print(" vmalloc", end="")
if v.flags & VM_MAP:
print(" vmap", end="")
if v.flags & VM_USERMAP:
print(" user", end="")
if v.flags & VM_DMA_COHERENT:
print(" dma-coherent", end="")
if is_vmalloc_addr(prog, v.pages):
print(" vpages", end="")
print("")
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