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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2016-04-29 15:25:38 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-05-01 10:32:33 +0200 |
| commit | 30bda41aba4efb2370c97e2cbe7385de93ccc372 (patch) | |
| tree | 3584b20bb4e895469fb2dc0ca6309402928d1d63 /arch/powerpc/mm/pgtable_64.c | |
| parent | powerpc/mm: Use a helper for finding pte bits mapping I/O area (diff) | |
| download | linux-30bda41aba4efb2370c97e2cbe7385de93ccc372.tar.xz linux-30bda41aba4efb2370c97e2cbe7385de93ccc372.zip | |
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_64.c')
| -rw-r--r-- | arch/powerpc/mm/pgtable_64.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index ea60a24c17a6..b3040b4535da 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -167,10 +167,6 @@ void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size, if ((flags & _PAGE_PRESENT) == 0) flags |= pgprot_val(PAGE_KERNEL); - /* Non-cacheable page cannot be coherent */ - if (flags & _PAGE_NO_CACHE) - flags &= ~_PAGE_COHERENT; - /* We don't support the 4K PFN hack with ioremap */ if (flags & _PAGE_4K_PFN) return NULL; |