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powerpc/mm: Drop WIMG in favour of new constants

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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>
This commit is contained in:
Aneesh Kumar K.V
2016-04-29 23:25:38 +10:00
committed by Michael Ellerman
parent 72176dd0ad
commit 30bda41aba
9 changed files with 66 additions and 90 deletions
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2
arch/powerpc/mm/hash64_64k.c
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@@ -244,7 +244,7 @@ int __hash_page_64K(unsigned long ea, unsigned long access,
* If so, bail out and refault as a 4k page
*/
if (!mmu_has_feature(MMU_FTR_CI_LARGE_PAGE) &&
unlikely(old_pte & _PAGE_NO_CACHE))
unlikely(pte_ci(pte)))
return 0;
/*
* Try to lock the PTE, add ACCESSED and DIRTY if it was