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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2016-04-29 16:25:38 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-05-01 11:32:33 +0300 |
| commit | 30bda41aba4efb2370c97e2cbe7385de93ccc372 (patch) | |
| tree | 3584b20bb4e895469fb2dc0ca6309402928d1d63 /arch/powerpc/mm/pgtable.c | |
| parent | 72176dd0ad36c6d8e13515d085f7a229a55a2985 (diff) | |
| download | linux-30bda41aba4efb2370c97e2cbe7385de93ccc372.tar.xz | |
powerpc/mm: Drop WIMG in favour of new constants
PowerISA 3.0 introduces two pte bits with the below meaning for radix:
00 -> Normal Memory
01 -> Strong Access Order (SAO)
10 -> Non idempotent I/O (Cache inhibited and guarded)
11 -> Tolerant I/O (Cache inhibited)
We drop the existing WIMG bits in the Linux page table in favour of the
above constants. We loose _PAGE_WRITETHRU with this conversion. We only
use writethru via pgprot_cached_wthru() which is used by
fbdev/controlfb.c which is Apple control display and also PPC32.
With respect to _PAGE_COHERENCE, we have been marking hpte always
coherent for some time now. htab_convert_pte_flags() always added
HPTE_R_M.
NOTE: KVM changes need closer review.
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/mm/pgtable.c')
| -rw-r--r-- | arch/powerpc/mm/pgtable.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c index 125fb4b54445..db277b6d8e8b 100644 --- a/arch/powerpc/mm/pgtable.c +++ b/arch/powerpc/mm/pgtable.c @@ -38,16 +38,16 @@ static inline int is_exec_fault(void) /* We only try to do i/d cache coherency on stuff that looks like * reasonably "normal" PTEs. We currently require a PTE to be present - * and we avoid _PAGE_SPECIAL and _PAGE_NO_CACHE. We also only do that + * and we avoid _PAGE_SPECIAL and cache inhibited pte. We also only do that * on userspace PTEs */ static inline int pte_looks_normal(pte_t pte) { #if defined(CONFIG_PPC_BOOK3S_64) - if ((pte_val(pte) & - (_PAGE_PRESENT | _PAGE_SPECIAL | _PAGE_NO_CACHE)) == - _PAGE_PRESENT) { + if ((pte_val(pte) & (_PAGE_PRESENT | _PAGE_SPECIAL)) == _PAGE_PRESENT) { + if (pte_ci(pte)) + return 0; if (pte_user(pte)) return 1; } |