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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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15
arch/powerpc/mm/mmu_context_book3s64.c
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@@ -179,6 +179,19 @@ void __destroy_context(int context_id)
}
EXPORT_SYMBOL_GPL(__destroy_context);
static void destroy_contexts(mm_context_t *ctx)
{
int index, context_id;
spin_lock(&mmu_context_lock);
for (index = 0; index < ARRAY_SIZE(ctx->extended_id); index++) {
context_id = ctx->extended_id[index];
if (context_id)
ida_remove(&mmu_context_ida, context_id);
}
spin_unlock(&mmu_context_lock);
}
#ifdef CONFIG_PPC_64K_PAGES
static void destroy_pagetable_page(struct mm_struct *mm)
{
@@ -217,7 +230,7 @@ void destroy_context(struct mm_struct *mm)
else
subpage_prot_free(mm);
destroy_pagetable_page(mm);
__destroy_context(mm->context.id);
destroy_contexts(&mm->context);
mm->context.id = MMU_NO_CONTEXT;
}