powerpc: Introduce local (non-broadcast) forms of tlb invalidates

Introduced a new set of low level tlb invalidate functions that do not
broadcast invalidates on the bus:

_tlbil_all - invalidate all
_tlbil_pid - invalidate based on process id (or mm context)
_tlbil_va  - invalidate based on virtual address (ea + pid)

On non-SMP configs _tlbil_all should be functionally equivalent to _tlbia and
_tlbil_va should be functionally equivalent to _tlbie.

The intent of this change is to handle SMP based invalidates via IPIs instead
of broadcasts as the mechanism scales better for larger number of cores.

On e500 (fsl-booke mmu) based cores move to using MMUCSR for invalidate alls
and tlbsx/tlbwe for invalidate virtual address.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/reg_booke.h b/arch/powerpc/include/asm/reg_booke.h
index be980f4ee495..67453766bff1 100644
--- a/arch/powerpc/include/asm/reg_booke.h
+++ b/arch/powerpc/include/asm/reg_booke.h
@@ -109,6 +109,7 @@
 #define SPRN_EVPR       0x3D6   /* Exception Vector Prefix Register */
 #define SPRN_L1CSR0     0x3F2   /* L1 Cache Control and Status Register 0 */
 #define SPRN_L1CSR1     0x3F3   /* L1 Cache Control and Status Register 1 */
+#define SPRN_MMUCSR0    0x3F4   /* MMU Control and Status Register 0 */
 #define SPRN_PIT        0x3DB   /* Programmable Interval Timer */
 #define SPRN_BUCSR      0x3F5   /* Branch Unit Control and Status */
 #define SPRN_L2CSR0     0x3F9   /* L2 Data Cache Control and Status Register 0 */
@@ -410,6 +411,12 @@
 #define L2CSR0_L2LOA    0x00000080      /* L2 Cache Lock Overflow Allocate */
 #define L2CSR0_L2LO     0x00000020      /* L2 Cache Lock Overflow */
 
+/* Bit definitions for MMUCSR0 */
+#define MMUCSR0_TLB1FI  0x00000002      /* TLB1 Flash invalidate */
+#define MMUCSR0_TLB0FI  0x00000004      /* TLB0 Flash invalidate */
+#define MMUCSR0_TLB2FI  0x00000040      /* TLB2 Flash invalidate */
+#define MMUCSR0_TLB3FI  0x00000020      /* TLB3 Flash invalidate */
+
 /* Bit definitions for SGR. */
 #define SGR_NORMAL      0               /* Speculative fetching allowed. */
 #define SGR_GUARDED     1               /* Speculative fetching disallowed. */