diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2018-03-26 12:04:48 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-03-30 15:10:38 +0200 |
| commit | f384796c40dc55b3dba25e0ee9c1afd98c6d24d1 (patch) | |
| tree | 400e1127554c05abff89a9d09bac2b40f844eba7 /arch/powerpc/kernel/exceptions-64s.S | |
| parent | powerpc/mm/slice: Consolidate return path in slice_get_unmapped_area() (diff) | |
| download | linux-f384796c40dc55b3dba25e0ee9c1afd98c6d24d1.tar.xz linux-f384796c40dc55b3dba25e0ee9c1afd98c6d24d1.zip | |
powerpc/mm: Add support for handling > 512TB address in SLB miss
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>
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64s.S')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 6bee20c43feb..1a0aa70bcb2b 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -621,7 +621,10 @@ END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX) lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ mtlr r10 - beq- 8f /* if bad address, make full stack frame */ + /* + * Large address, check whether we have to allocate new contexts. + */ + beq- 8f bne- cr5,2f /* if unrecoverable exception, oops */ @@ -685,7 +688,7 @@ END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX) mr r3,r12 mfspr r11,SPRN_SRR0 mfspr r12,SPRN_SRR1 - LOAD_HANDLER(r10,bad_addr_slb) + LOAD_HANDLER(r10, large_addr_slb) mtspr SPRN_SRR0,r10 ld r10,PACAKMSR(r13) mtspr SPRN_SRR1,r10 @@ -700,7 +703,7 @@ EXC_COMMON_BEGIN(unrecov_slb) bl unrecoverable_exception b 1b -EXC_COMMON_BEGIN(bad_addr_slb) +EXC_COMMON_BEGIN(large_addr_slb) EXCEPTION_PROLOG_COMMON(0x380, PACA_EXSLB) RECONCILE_IRQ_STATE(r10, r11) ld r3, PACA_EXSLB+EX_DAR(r13) @@ -710,7 +713,7 @@ EXC_COMMON_BEGIN(bad_addr_slb) std r10, _TRAP(r1) 2: bl save_nvgprs addi r3, r1, STACK_FRAME_OVERHEAD - bl slb_miss_bad_addr + bl slb_miss_large_addr b ret_from_except EXC_REAL_BEGIN(hardware_interrupt, 0x500, 0x100) |