static int get_nid_for_pfn(unsigned long pfn)
{
struct page *page;
if (!pfn_valid_within(pfn))
return -1;
page = pfn_to_page(pfn);
if (!page_initialized(page))
return -1;
return pfn_to_nid(pfn);
}
static int __ref get_nid_for_pfn(unsigned long pfn)
{
struct page *page;
if (!pfn_valid_within(pfn))
return -1;
#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
if (system_state == SYSTEM_BOOTING)
return early_pfn_to_nid(pfn);
#endif
page = pfn_to_page(pfn);
if (!page_initialized(page))
return -1;
return pfn_to_nid(pfn);
}
void __init page_cgroup_init(void)
{
unsigned long pfn;
int nid;
if (mem_cgroup_disabled())
return;
for_each_node_state(nid, N_HIGH_MEMORY) {
unsigned long start_pfn, end_pfn;
start_pfn = node_start_pfn(nid);
end_pfn = node_end_pfn(nid);
/*
* start_pfn and end_pfn may not be aligned to SECTION and the
* page->flags of out of node pages are not initialized. So we
* scan [start_pfn, the biggest section's pfn < end_pfn) here.
*/
for (pfn = start_pfn;
pfn < end_pfn;
pfn = ALIGN(pfn + 1, PAGES_PER_SECTION)) {
/*
* even if the first pfn is invalid, that doesn't mean
* that the entire section is not used.
* so we should check if the section has the mem map.
* if it has the mem map then we should go ahead and
* create the page cgroup.
*/
struct mem_section *section = __pfn_to_section(pfn);
if (!section->section_mem_map)
continue;
/*
* Nodes's pfns can be overlapping.
* We know some arch can have a nodes layout such as
* -------------pfn-------------->
* N0 | N1 | N2 | N0 | N1 | N2|....
*/
if (pfn_to_nid(pfn) != nid)
continue;
if (init_section_page_cgroup(pfn, nid))
goto oom;
}
}
static int __meminit kasan_mem_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct memory_notify *mem_data = data;
unsigned long nr_shadow_pages, start_kaddr, shadow_start;
unsigned long shadow_end, shadow_size;
nr_shadow_pages = mem_data->nr_pages >> KASAN_SHADOW_SCALE_SHIFT;
start_kaddr = (unsigned long)pfn_to_kaddr(mem_data->start_pfn);
shadow_start = (unsigned long)kasan_mem_to_shadow((void *)start_kaddr);
shadow_size = nr_shadow_pages << PAGE_SHIFT;
shadow_end = shadow_start + shadow_size;
if (WARN_ON(mem_data->nr_pages % KASAN_SHADOW_SCALE_SIZE) ||
WARN_ON(start_kaddr % (KASAN_SHADOW_SCALE_SIZE << PAGE_SHIFT)))
return NOTIFY_BAD;
switch (action) {
case MEM_GOING_ONLINE: {
void *ret;
ret = __vmalloc_node_range(shadow_size, PAGE_SIZE, shadow_start,
shadow_end, GFP_KERNEL,
PAGE_KERNEL, VM_NO_GUARD,
pfn_to_nid(mem_data->start_pfn),
__builtin_return_address(0));
if (!ret)
return NOTIFY_BAD;
kmemleak_ignore(ret);
return NOTIFY_OK;
}
case MEM_OFFLINE:
vfree((void *)shadow_start);
}
return NOTIFY_OK;
}
void __init page_cgroup_init(void)
{
unsigned long pfn;
int nid;
if (mem_cgroup_disabled())
return;
for_each_node_state(nid, N_HIGH_MEMORY) {
unsigned long start_pfn, end_pfn;
start_pfn = node_start_pfn(nid);
end_pfn = node_end_pfn(nid);
/*
* start_pfn and end_pfn may not be aligned to SECTION and the
* page->flags of out of node pages are not initialized. So we
* scan [start_pfn, the biggest section's pfn < end_pfn) here.
*/
for (pfn = start_pfn;
pfn < end_pfn;
pfn = ALIGN(pfn + 1, PAGES_PER_SECTION)) {
if (!pfn_valid(pfn))
continue;
/*
* Nodes's pfns can be overlapping.
* We know some arch can have a nodes layout such as
* -------------pfn-------------->
* N0 | N1 | N2 | N0 | N1 | N2|....
*/
if (pfn_to_nid(pfn) != nid)
continue;
if (init_section_page_cgroup(pfn, nid))
goto oom;
}
}
void __init kasan_init(void)
{
u64 kimg_shadow_start, kimg_shadow_end;
u64 mod_shadow_start, mod_shadow_end;
struct memblock_region *reg;
int i;
kimg_shadow_start = (u64)kasan_mem_to_shadow(_text);
kimg_shadow_end = (u64)kasan_mem_to_shadow(_end);
mod_shadow_start = (u64)kasan_mem_to_shadow((void *)MODULES_VADDR);
mod_shadow_end = (u64)kasan_mem_to_shadow((void *)MODULES_END);
/*
* We are going to perform proper setup of shadow memory.
* At first we should unmap early shadow (clear_pgds() call bellow).
* However, instrumented code couldn't execute without shadow memory.
* tmp_pg_dir used to keep early shadow mapped until full shadow
* setup will be finished.
*/
memcpy(tmp_pg_dir, swapper_pg_dir, sizeof(tmp_pg_dir));
dsb(ishst);
cpu_replace_ttbr1(lm_alias(tmp_pg_dir));
clear_pgds(KASAN_SHADOW_START, KASAN_SHADOW_END);
vmemmap_populate(kimg_shadow_start, kimg_shadow_end,
pfn_to_nid(virt_to_pfn(_text)));
/*
* vmemmap_populate() has populated the shadow region that covers the
* kernel image with SWAPPER_BLOCK_SIZE mappings, so we have to round
* the start and end addresses to SWAPPER_BLOCK_SIZE as well, to prevent
* kasan_populate_zero_shadow() from replacing the page table entries
* (PMD or PTE) at the edges of the shadow region for the kernel
* image.
*/
kimg_shadow_start = round_down(kimg_shadow_start, SWAPPER_BLOCK_SIZE);
kimg_shadow_end = round_up(kimg_shadow_end, SWAPPER_BLOCK_SIZE);
kasan_populate_zero_shadow((void *)KASAN_SHADOW_START,
(void *)mod_shadow_start);
kasan_populate_zero_shadow((void *)kimg_shadow_end,
kasan_mem_to_shadow((void *)PAGE_OFFSET));
if (kimg_shadow_start > mod_shadow_end)
kasan_populate_zero_shadow((void *)mod_shadow_end,
(void *)kimg_shadow_start);
for_each_memblock(memory, reg) {
void *start = (void *)__phys_to_virt(reg->base);
void *end = (void *)__phys_to_virt(reg->base + reg->size);
if (start >= end)
break;
/*
* end + 1 here is intentional. We check several shadow bytes in
* advance to slightly speed up fastpath. In some rare cases
* we could cross boundary of mapped shadow, so we just map
* some more here.
*/
vmemmap_populate((unsigned long)kasan_mem_to_shadow(start),
(unsigned long)kasan_mem_to_shadow(end) + 1,
pfn_to_nid(virt_to_pfn(start)));
}
