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usr
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src
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linux-headers-6.8.0-36-generic
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scripts
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gdb
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linux
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drwxr-xr-x
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page_owner.py
# SPDX-License-Identifier: GPL-2.0 # # Copyright (c) 2023 MediaTek Inc. # # Authors: # Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com> # import gdb from linux import utils, stackdepot, constants, mm if constants.LX_CONFIG_PAGE_OWNER: page_ext_t = utils.CachedType('struct page_ext') page_owner_t = utils.CachedType('struct page_owner') PAGE_OWNER_STACK_DEPTH = 16 PAGE_EXT_OWNER = constants.LX_PAGE_EXT_OWNER PAGE_EXT_INVALID = 0x1 PAGE_EXT_OWNER_ALLOCATED = constants.LX_PAGE_EXT_OWNER_ALLOCATED def help(): t = """Usage: lx-dump-page-owner [Option] Option: --pfn [Decimal pfn] Example: lx-dump-page-owner --pfn 655360\n""" gdb.write("Unrecognized command\n") raise gdb.GdbError(t) class DumpPageOwner(gdb.Command): """Dump page owner""" min_pfn = None max_pfn = None p_ops = None migrate_reason_names = None def __init__(self): super(DumpPageOwner, self).__init__("lx-dump-page-owner", gdb.COMMAND_SUPPORT) def invoke(self, args, from_tty): if not constants.LX_CONFIG_PAGE_OWNER: raise gdb.GdbError('CONFIG_PAGE_OWNER does not enable') page_owner_inited = gdb.parse_and_eval('page_owner_inited') if page_owner_inited['key']['enabled']['counter'] != 0x1: raise gdb.GdbError('page_owner_inited is not enabled') self.p_ops = mm.page_ops().ops self.get_page_owner_info() argv = gdb.string_to_argv(args) if len(argv) == 0: self.read_page_owner() elif len(argv) == 2: if argv[0] == "--pfn": pfn = int(argv[1]) self.read_page_owner_by_addr(self.p_ops.pfn_to_page(pfn)) else: help() else: help() def get_page_owner_info(self): self.min_pfn = int(gdb.parse_and_eval("min_low_pfn")) self.max_pfn = int(gdb.parse_and_eval("max_pfn")) self.page_ext_size = int(gdb.parse_and_eval("page_ext_size")) self.migrate_reason_names = gdb.parse_and_eval('migrate_reason_names') def page_ext_invalid(self, page_ext): if page_ext == gdb.Value(0): return True if page_ext.cast(utils.get_ulong_type()) & PAGE_EXT_INVALID == PAGE_EXT_INVALID: return True return False def get_entry(self, base, index): return (base.cast(utils.get_ulong_type()) + self.page_ext_size * index).cast(page_ext_t.get_type().pointer()) def lookup_page_ext(self, page): pfn = self.p_ops.page_to_pfn(page) section = self.p_ops.pfn_to_section(pfn) page_ext = section["page_ext"] if self.page_ext_invalid(page_ext): return gdb.Value(0) return self.get_entry(page_ext, pfn) def page_ext_get(self, page): page_ext = self.lookup_page_ext(page) if page_ext != gdb.Value(0): return page_ext else: return gdb.Value(0) def get_page_owner(self, page_ext): addr = page_ext.cast(utils.get_ulong_type()) + gdb.parse_and_eval("page_owner_ops")["offset"].cast(utils.get_ulong_type()) return addr.cast(page_owner_t.get_type().pointer()) def read_page_owner_by_addr(self, struct_page_addr): page = gdb.Value(struct_page_addr).cast(utils.get_page_type().pointer()) pfn = self.p_ops.page_to_pfn(page) if pfn < self.min_pfn or pfn > self.max_pfn or (not self.p_ops.pfn_valid(pfn)): gdb.write("pfn is invalid\n") return page = self.p_ops.pfn_to_page(pfn) page_ext = self.page_ext_get(page) if page_ext == gdb.Value(0): gdb.write("page_ext is null\n") return if not (page_ext['flags'] & (1 << PAGE_EXT_OWNER)): gdb.write("page_owner flag is invalid\n") raise gdb.GdbError('page_owner info is not present (never set?)\n') if mm.test_bit(PAGE_EXT_OWNER_ALLOCATED, page_ext['flags'].address): gdb.write('page_owner tracks the page as allocated\n') else: gdb.write('page_owner tracks the page as freed\n') if not (page_ext['flags'] & (1 << PAGE_EXT_OWNER_ALLOCATED)): gdb.write("page_owner is not allocated\n") page_owner = self.get_page_owner(page_ext) gdb.write("Page last allocated via order %d, gfp_mask: 0x%x, pid: %d, tgid: %d (%s), ts %u ns, free_ts %u ns\n" %\ (page_owner["order"], page_owner["gfp_mask"],\ page_owner["pid"], page_owner["tgid"], page_owner["comm"].string(),\ page_owner["ts_nsec"], page_owner["free_ts_nsec"])) gdb.write("PFN: %d, Flags: 0x%x\n" % (pfn, page['flags'])) if page_owner["handle"] == 0: gdb.write('page_owner allocation stack trace missing\n') else: stackdepot.stack_depot_print(page_owner["handle"]) if page_owner["free_handle"] == 0: gdb.write('page_owner free stack trace missing\n') else: gdb.write('page last free stack trace:\n') stackdepot.stack_depot_print(page_owner["free_handle"]) if page_owner['last_migrate_reason'] != -1: gdb.write('page has been migrated, last migrate reason: %s\n' % self.migrate_reason_names[page_owner['last_migrate_reason']]) def read_page_owner(self): pfn = self.min_pfn # Find a valid PFN or the start of a MAX_ORDER_NR_PAGES area while ((not self.p_ops.pfn_valid(pfn)) and (pfn & (self.p_ops.MAX_ORDER_NR_PAGES - 1))) != 0: pfn += 1 while pfn < self.max_pfn: # # If the new page is in a new MAX_ORDER_NR_PAGES area, # validate the area as existing, skip it if not # if ((pfn & (self.p_ops.MAX_ORDER_NR_PAGES - 1)) == 0) and (not self.p_ops.pfn_valid(pfn)): pfn += (self.p_ops.MAX_ORDER_NR_PAGES - 1) continue; page = self.p_ops.pfn_to_page(pfn) page_ext = self.page_ext_get(page) if page_ext == gdb.Value(0): pfn += 1 continue if not (page_ext['flags'] & (1 << PAGE_EXT_OWNER)): pfn += 1 continue if not (page_ext['flags'] & (1 << PAGE_EXT_OWNER_ALLOCATED)): pfn += 1 continue page_owner = self.get_page_owner(page_ext) gdb.write("Page allocated via order %d, gfp_mask: 0x%x, pid: %d, tgid: %d (%s), ts %u ns, free_ts %u ns\n" %\ (page_owner["order"], page_owner["gfp_mask"],\ page_owner["pid"], page_owner["tgid"], page_owner["comm"].string(),\ page_owner["ts_nsec"], page_owner["free_ts_nsec"])) gdb.write("PFN: %d, Flags: 0x%x\n" % (pfn, page['flags'])) stackdepot.stack_depot_print(page_owner["handle"]) pfn += (1 << page_owner["order"]) DumpPageOwner()
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