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powerpc/mm: Add support for handling > 512TB address in SLB miss

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For addresses above 512TB we allocate additional mmu contexts. To make
it all easy, addresses above 512TB are handled with IR/DR=1 and with
stack frame setup.

The mmu_context_t is also updated to track the new extended_ids. To
support upto 4PB we need a total 8 contexts.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
[mpe: Minor formatting tweaks and comment wording, switch BUG to WARN
      in get_ea_context().]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V
2018-03-26 15:34:48 +05:30
committed by Michael Ellerman
parent 0dea04b288
commit f384796c40
15 changed files with 246 additions and 28 deletions
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4
arch/powerpc/mm/hash_utils_64.c
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@@ -1267,7 +1267,7 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea,
}
psize = get_slice_psize(mm, ea);
ssize = user_segment_size(ea);
vsid = get_vsid(mm->context.id, ea, ssize);
vsid = get_user_vsid(&mm->context, ea, ssize);
break;
case VMALLOC_REGION_ID:
vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
@@ -1532,7 +1532,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
/* Get VSID */
ssize = user_segment_size(ea);
vsid = get_vsid(mm->context.id, ea, ssize);
vsid = get_user_vsid(&mm->context, ea, ssize);
if (!vsid)
return;
/*