powerpc/mm/radix: Update PID switch sequence

Update the PID switch as per ISA doc. slbia is needed in radix to
invalidate any implementation specific lookaside information.
We use the .long format due to build errors with the below compiler
version.

gcc (Ubuntu 5.3.1-14ubuntu2.1) 5.3.1 20160413
GNU assembler (GNU Binutils for Ubuntu) 2.26

CC      arch/powerpc/mm//mmu_context_book3s64.o
{standard input}: Assembler messages:
{standard input}:506: Error: junk at end of line: `0x7'
scripts/Makefile.build:291: recipe for target 'arch/powerpc/mm//mmu_context_book3s64.o' failed
make[1]: *** [arch/powerpc/mm//mmu_context_book3s64.o] Error 1
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

2 files changed, 7 insertions, 1 deletions

diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
index 1c18a43e0d65..5ecfb04fec98 100644
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -181,6 +181,7 @@
 #define PPC_INST_MTSPR_DSCR_USER        0x7c0303a6
 #define PPC_INST_MTSPR_DSCR_USER_MASK   0xfc1fffff
 #define PPC_INST_SLBFEE                 0x7c0007a7
+#define PPC_INST_SLBIA                  0x7c0003e4
 
 #define PPC_INST_STRING                 0x7c00042a
 #define PPC_INST_STRING_MASK            0xfc0007fe
@@ -442,5 +443,7 @@
                                                ___PPC_RA(a) |           \
                                                ___PPC_RB(b))
 
+#define PPC_SLBIA(IH)   stringify_in_c(.long PPC_INST_SLBIA | \
+                                       ((IH & 0x7) << 21))
 
 #endif /* _ASM_POWERPC_PPC_OPCODE_H */
diff --git a/arch/powerpc/mm/mmu_context_book3s64.c b/arch/powerpc/mm/mmu_context_book3s64.c
index 196222227e82..b114f8b93ec9 100644
--- a/arch/powerpc/mm/mmu_context_book3s64.c
+++ b/arch/powerpc/mm/mmu_context_book3s64.c
@@ -181,7 +181,10 @@ void destroy_context(struct mm_struct *mm)
 #ifdef CONFIG_PPC_RADIX_MMU
 void radix__switch_mmu_context(struct mm_struct *prev, struct mm_struct *next)
 {
-        mtspr(SPRN_PID, next->context.id);
         asm volatile("isync": : :"memory");
+        mtspr(SPRN_PID, next->context.id);
+        asm volatile("isync \n"
+                     PPC_SLBIA(0x7)
+                     : : :"memory");
 }
 #endif