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x86, hibernate: fix breakage on x86_32 with CONFIG_NUMA set

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Impact: fix crash during hibernation on 32-bit NUMA

The NUMA code on x86_32 creates special memory mapping that allows
each node's pgdat to be located in this node's memory.  For this
purpose it allocates a memory area at the end of each node's memory
and maps this area so that it is accessible with virtual addresses
belonging to low memory.  As a result, if there is high memory,
these NUMA-allocated areas are physically located in high memory,
although they are mapped to low memory addresses.

Our hibernation code does not take that into account and for this
reason hibernation fails on all x86_32 systems with CONFIG_NUMA=y and
with high memory present.  Fix this by adding a special mapping for
the NUMA-allocated memory areas to the temporary page tables created
during the last phase of resume.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Rafael J. Wysocki 2008-11-12 23:22:35 +01:00 committed by Ingo Molnar
parent 3edac25f2e
commit 97a70e548b
3 changed files with 43 additions and 0 deletions
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4
arch/x86/include/asm/mmzone_32.h
View File

@ -34,10 +34,14 @@ static inline void get_memcfg_numa(void)
extern int early_pfn_to_nid(unsigned long pfn);
extern void resume_map_numa_kva(pgd_t *pgd);
#else /* !CONFIG_NUMA */
#define get_memcfg_numa get_memcfg_numa_flat
static inline void resume_map_numa_kva(pgd_t *pgd) {}
#endif /* CONFIG_NUMA */
#ifdef CONFIG_DISCONTIGMEM

35
arch/x86/mm/numa_32.c
View File

@ -222,6 +222,41 @@ static void __init remap_numa_kva(void)
}
}
#ifdef CONFIG_HIBERNATION
/**
* resume_map_numa_kva - add KVA mapping to the temporary page tables created
* during resume from hibernation
* @pgd_base - temporary resume page directory
*/
void resume_map_numa_kva(pgd_t *pgd_base)
{
int node;
for_each_online_node(node) {
unsigned long start_va, start_pfn, size, pfn;
start_va = (unsigned long)node_remap_start_vaddr[node];
start_pfn = node_remap_start_pfn[node];
size = node_remap_size[node];
printk(KERN_DEBUG "%s: node %d\n", __FUNCTION__, node);
for (pfn = 0; pfn < size; pfn += PTRS_PER_PTE) {
unsigned long vaddr = start_va + (pfn << PAGE_SHIFT);
pgd_t *pgd = pgd_base + pgd_index(vaddr);
pud_t *pud = pud_offset(pgd, vaddr);
pmd_t *pmd = pmd_offset(pud, vaddr);
set_pmd(pmd, pfn_pmd(start_pfn + pfn,
PAGE_KERNEL_LARGE_EXEC));
printk(KERN_DEBUG "%s: %08lx -> pfn %08lx\n",
__FUNCTION__, vaddr, start_pfn + pfn);
}
}
}
#endif
static unsigned long calculate_numa_remap_pages(void)
{
int nid;

4
arch/x86/power/hibernate_32.c
View File

@ -12,6 +12,7 @@
#include <asm/system.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/mmzone.h>
/* Defined in hibernate_asm_32.S */
extern int restore_image(void);
@ -127,6 +128,9 @@ static int resume_physical_mapping_init(pgd_t *pgd_base)
}
}
}
resume_map_numa_kva(pgd_base);
return 0;
}