diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2016-11-28 11:47:00 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-11-28 22:37:41 +1100 |
| commit | 049d567af209b093eefa9f26eae6e15226db3520 (patch) | |
| tree | 00f33c18a0037c1bb83dd71a6525571f5ed0f7aa /arch/powerpc/include/asm/book3s/64/pgtable.h | |
| parent | ccf17c8b5c8465750a6c514be9ef6f5b156b6c67 (diff) | |
powerpc/mm: Introduce _PAGE_LARGE software pte bits
This patch adds a new software defined pte bit. We use the reserved
fields of ISA 3.0 pte definition since we will only be using this on DD1
code paths. We can possibly look at removing this code later.
The software bit will be used to differentiate between 64K/4K and 2M
ptes. This helps in finding the page size mapping by a pte so that we
can do efficient tlb flush.
We don't support 1G hugetlb pages yet. So we add a DEBUG WARN_ON to
catch wrong usage.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/book3s/64/pgtable.h')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/pgtable.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 9fd77f8794a0..ac66d05a7c01 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -26,6 +26,11 @@ #define _RPAGE_SW1 0x00800 #define _RPAGE_SW2 0x00400 #define _RPAGE_SW3 0x00200 +#define _RPAGE_RSV1 0x1000000000000000UL +#define _RPAGE_RSV2 0x0800000000000000UL +#define _RPAGE_RSV3 0x0400000000000000UL +#define _RPAGE_RSV4 0x0200000000000000UL + #ifdef CONFIG_MEM_SOFT_DIRTY #define _PAGE_SOFT_DIRTY _RPAGE_SW3 /* software: software dirty tracking */ #else @@ -33,6 +38,11 @@ #endif #define _PAGE_SPECIAL _RPAGE_SW2 /* software: special page */ +/* + * For P9 DD1 only, we need to track whether the pte's huge. + */ +#define _PAGE_LARGE _RPAGE_RSV1 + #define _PAGE_PTE (1ul << 62) /* distinguishes PTEs from pointers */ #define _PAGE_PRESENT (1ul << 63) /* pte contains a translation */ |