powerpc/fsl-booke: Add support for tlbilx instructions

The e500mc core supports the new tlbilx instructions that do core
local invalidates and also provide us the ability to take down
all TLB entries matching a given PID.
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

arch/powerpc/include/asm/mmu.h

@@ -36,9 +36,9 @@
  */
 #define MMU_FTR_USE_TLBIVAX_BCAST	ASM_CONST(0x00040000)
 
-/* Enable use of tlbilx invalidate-by-PID variant.
+/* Enable use of tlbilx invalidate instructions.
  */
-#define MMU_FTR_USE_TLBILX_PID		ASM_CONST(0x00080000)
+#define MMU_FTR_USE_TLBILX		ASM_CONST(0x00080000)
 
 /* This indicates that the processor cannot handle multiple outstanding
  * broadcast tlbivax or tlbsync. This makes the code use a spinlock

arch/powerpc/kernel/cputable.c

@@ -1754,7 +1754,8 @@ static struct cpu_spec __initdata cpu_specs[] = {
 		.cpu_name		= "e500mc",
 		.cpu_features		= CPU_FTRS_E500MC,
 		.cpu_user_features	= COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU,
-		.mmu_features		= MMU_FTR_TYPE_FSL_E | MMU_FTR_BIG_PHYS,
+		.mmu_features		= MMU_FTR_TYPE_FSL_E | MMU_FTR_BIG_PHYS |
+			MMU_FTR_USE_TLBILX,
 		.icache_bsize		= 64,
 		.dcache_bsize		= 64,
 		.num_pmcs		= 4,

arch/powerpc/mm/tlb_nohash_low.S

@@ -118,25 +118,50 @@ _GLOBAL(_tlbil_pid)
 
 #elif defined(CONFIG_FSL_BOOKE)
 /*
- * FSL BookE implementations. Currently _pid and _all are the
- * same. This will change when tlbilx is actually supported and
- * performs invalidate-by-PID. This change will be driven by
- * mmu_features conditional
+ * FSL BookE implementations.
+ *
+ * Since feature sections are using _SECTION_ELSE we need
+ * to have the larger code path before the _SECTION_ELSE
  */
 
+#define MMUCSR0_TLBFI	(MMUCSR0_TLB0FI | MMUCSR0_TLB1FI | \
+			 MMUCSR0_TLB2FI | MMUCSR0_TLB3FI)
 /*
  * Flush MMU TLB on the local processor
  */
-_GLOBAL(_tlbil_pid)
 _GLOBAL(_tlbil_all)
-#define MMUCSR0_TLBFI	(MMUCSR0_TLB0FI | MMUCSR0_TLB1FI | \
-			 MMUCSR0_TLB2FI | MMUCSR0_TLB3FI)
+BEGIN_MMU_FTR_SECTION
+	li	r3,(MMUCSR0_TLBFI)@l
+	mtspr	SPRN_MMUCSR0, r3
+1:
+	mfspr	r3,SPRN_MMUCSR0
+	andi.	r3,r3,MMUCSR0_TLBFI@l
+	bne	1b
+MMU_FTR_SECTION_ELSE
+	PPC_TLBILX_ALL(0,0)
+ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_USE_TLBILX)
+	msync
+	isync
+	blr
+
+_GLOBAL(_tlbil_pid)
+BEGIN_MMU_FTR_SECTION
+	slwi	r3,r3,16
+	mfmsr	r10
+	wrteei	0
+	mfspr	r4,SPRN_MAS6	/* save MAS6 */
+	mtspr	SPRN_MAS6,r3
+	PPC_TLBILX_PID(0,0)
+	mtspr	SPRN_MAS6,r4	/* restore MAS6 */
+	wrtee	r10
+MMU_FTR_SECTION_ELSE
 	li	r3,(MMUCSR0_TLBFI)@l
 	mtspr	SPRN_MMUCSR0, r3
 1:
 	mfspr	r3,SPRN_MMUCSR0
 	andi.	r3,r3,MMUCSR0_TLBFI@l
 	bne	1b
+ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_USE_TLBILX)
 	msync
 	isync
 	blr
@@ -149,7 +174,9 @@ _GLOBAL(_tlbil_va)
 	mfmsr	r10
 	wrteei	0
 	slwi	r4,r4,16
+	ori	r4,r4,(MAS6_ISIZE(BOOK3E_PAGESZ_4K))@l
 	mtspr	SPRN_MAS6,r4		/* assume AS=0 for now */
+BEGIN_MMU_FTR_SECTION
 	tlbsx	0,r3
 	mfspr	r4,SPRN_MAS1		/* check valid */
 	andis.	r3,r4,MAS1_VALID@h
@@ -157,6 +184,9 @@ _GLOBAL(_tlbil_va)
 	rlwinm	r4,r4,0,1,31
 	mtspr	SPRN_MAS1,r4
 	tlbwe
+MMU_FTR_SECTION_ELSE
+	PPC_TLBILX_VA(0,r3)
+ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_USE_TLBILX)
 	msync
 	isync
 1:	wrtee	r10