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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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12
arch/powerpc/kernel/traps.c
View file

@ -1495,18 +1495,6 @@ bail:
exception_exit(prev_state);
}
void slb_miss_bad_addr(struct pt_regs *regs)
{
enum ctx_state prev_state = exception_enter();
if (user_mode(regs))
_exception(SIGSEGV, regs, SEGV_BNDERR, regs->dar);
else
bad_page_fault(regs, regs->dar, SIGSEGV);
exception_exit(prev_state);
}
void StackOverflow(struct pt_regs *regs)
{
printk(KERN_CRIT "Kernel stack overflow in process %p, r1=%lx\n",