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powerpc/mm: Enable _PAGE_NUMA for book3s 

We steal the _PAGE_COHERENCE bit and use that for indicating NUMA ptes.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Aneesh Kumar K.V 2013-11-18 14:58:13 +05:30 committed by Benjamin Herrenschmidt
parent 8937ba48dc
commit c34a51ce49
3 changed files with 72 additions and 1 deletions
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66
arch/powerpc/include/asm/pgtable.h
View File

@ -3,6 +3,7 @@
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
#include <linux/mmdebug.h>
#include <asm/processor.h> /* For TASK_SIZE */
#include <asm/mmu.h>
#include <asm/page.h>
@ -33,10 +34,73 @@ static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
static inline int pte_present(pte_t pte) { return pte_val(pte) & _PAGE_PRESENT; }
static inline int pte_none(pte_t pte) { return (pte_val(pte) & ~_PTE_NONE_MASK) == 0; }
static inline pgprot_t pte_pgprot(pte_t pte) { return __pgprot(pte_val(pte) & PAGE_PROT_BITS); }
#ifdef CONFIG_NUMA_BALANCING
static inline int pte_present(pte_t pte)
{
return pte_val(pte) & (_PAGE_PRESENT | _PAGE_NUMA);
}
#define pte_numa pte_numa
static inline int pte_numa(pte_t pte)
{
return (pte_val(pte) &
(_PAGE_NUMA|_PAGE_PRESENT)) == _PAGE_NUMA;
}
#define pte_mknonnuma pte_mknonnuma
static inline pte_t pte_mknonnuma(pte_t pte)
{
pte_val(pte) &= ~_PAGE_NUMA;
pte_val(pte) |= _PAGE_PRESENT | _PAGE_ACCESSED;
return pte;
}
#define pte_mknuma pte_mknuma
static inline pte_t pte_mknuma(pte_t pte)
{
/*
* We should not set _PAGE_NUMA on non present ptes. Also clear the
* present bit so that hash_page will return 1 and we collect this
* as numa fault.
*/
if (pte_present(pte)) {
pte_val(pte) |= _PAGE_NUMA;
pte_val(pte) &= ~_PAGE_PRESENT;
} else
VM_BUG_ON(1);
return pte;
}
#define pmd_numa pmd_numa
static inline int pmd_numa(pmd_t pmd)
{
return pte_numa(pmd_pte(pmd));
}
#define pmd_mknonnuma pmd_mknonnuma
static inline pmd_t pmd_mknonnuma(pmd_t pmd)
{
return pte_pmd(pte_mknonnuma(pmd_pte(pmd)));
}
#define pmd_mknuma pmd_mknuma
static inline pmd_t pmd_mknuma(pmd_t pmd)
{
return pte_pmd(pte_mknuma(pmd_pte(pmd)));
}
# else
static inline int pte_present(pte_t pte)
{
return pte_val(pte) & _PAGE_PRESENT;
}
#endif /* CONFIG_NUMA_BALANCING */
/* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
*

6
arch/powerpc/include/asm/pte-hash64.h
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@ -27,6 +27,12 @@
#define _PAGE_RW 0x0200 /* software: user write access allowed */
#define _PAGE_BUSY 0x0800 /* software: PTE & hash are busy */
/*
* Used for tracking numa faults
*/
#define _PAGE_NUMA 0x00000010 /* Gather numa placement stats */
/* No separate kernel read-only */
#define _PAGE_KERNEL_RW (_PAGE_RW | _PAGE_DIRTY) /* user access blocked by key */
#define _PAGE_KERNEL_RO _PAGE_KERNEL_RW

1
arch/powerpc/platforms/Kconfig.cputype
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@ -72,6 +72,7 @@ config PPC_BOOK3S_64
select PPC_HAVE_PMU_SUPPORT
select SYS_SUPPORTS_HUGETLBFS
select HAVE_ARCH_TRANSPARENT_HUGEPAGE if PPC_64K_PAGES
select ARCH_SUPPORTS_NUMA_BALANCING
config PPC_BOOK3E_64
bool "Embedded processors"