From 3cf1db68431f187e6aaf47c338f26b0fe137f4b5 Mon Sep 17 00:00:00 2001
From: Mitchel Humpherys <mitchelh@codeaurora.org>
Date: Fri, 6 Nov 2015 17:05:23 -0800
Subject: [PATCH] lrdp-v2: mm: Calculate the vmemmap dynamically
We're currently using a hard-coded value for vmemmap. This doesn't work
anymore. Calculate its value dynamically the same way the kernel does
it.
Change-Id: If3e06007ab69c2ee91fefede770c2fb5ccb59fe3
---
linux-ramdump-parser-v2/mm.py | 35 +++++++++++++++++++++++++++--------
1 file changed, 27 insertions(+), 8 deletions(-)
diff --git a/linux-ramdump-parser-v2/mm.py b/linux-ramdump-parser-v2/mm.py
index df85030..09e6484 100755
--- a/linux-ramdump-parser-v2/mm.py
+++ b/linux-ramdump-parser-v2/mm.py
@@ -9,6 +9,8 @@
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
+import bitops
+
def page_buddy(ramdump, page):
mapcount_offset = ramdump.field_offset('struct page', '_mapcount')
@@ -127,20 +129,37 @@ def page_to_pfn_sparse(ramdump, page):
# divide by struct page size for division fun
return (page - addr) / sizeof_page
-# Yes, we are hard coding the vmemmap. This isn't very likely to change unless
-# the rest of the addresses start changing as well. When that happens, the
-# entire parser will probably be broken in many other ways so a better solution
-# can be derived then.
+
+def get_vmemmap(ramdump):
+ # See: include/asm-generic/pgtable-nopud.h,
+ # arch/arm64/include/asm/pgtable-hwdef.h,
+ # arch/arm64/include/asm/pgtable.h
+ nlevels = int(ramdump.get_config_val("CONFIG_ARM64_PGTABLE_LEVELS"))
+ if ramdump.is_config_defined("CONFIG_ARM64_64K_PAGES"):
+ page_shift = 16
+ else:
+ page_shift = 12
+ pgdir_shift = ((page_shift - 3) * nlevels) + 3
+ pud_shift = pgdir_shift
+ pud_size = 1 << pud_shift
+ va_bits = int(ramdump.get_config_val("CONFIG_ARM64_VA_BITS"))
+ spsize = ramdump.sizeof('struct page')
+ vmemmap_size = bitops.align((1 << (va_bits - page_shift)) * spsize,
+ pud_size)
+ vmalloc_end = ramdump.page_offset - pud_size - vmemmap_size
+ return vmalloc_end
+
+
def page_to_pfn_vmemmap(ramdump, page):
- mem_map = 0xffffffbc00000000
+ vmemmap = get_vmemmap(ramdump)
page_size = ramdump.sizeof('struct page')
- return ((page - mem_map) / page_size)
+ return ((page - vmemmap) / page_size)
def pfn_to_page_vmemmap(ramdump, pfn):
- mem_map = 0xffffffbc00000000
+ vmemmap = get_vmemmap(ramdump)
page_size = ramdump.sizeof('struct page')
- return mem_map + (pfn * page_size)
+ return vmemmap + (pfn * page_size)
def page_to_pfn_flat(ramdump, page):
--
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