powerpc: Free up some CPU feature bits by moving out MMU-related features

Some of the 64bit PPC CPU features are MMU-related, so this patch moves
them to MMU_FTR_ bits.  All cpu_has_feature()-style tests are moved to
mmu_has_feature(), and seven feature bits are freed as a result.

Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

3 files changed, 63 insertions, 24 deletions

diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index 2d71523ebb03..3db2476704d6 100644
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -178,23 +178,17 @@ extern const char *powerpc_base_platform;
 #define LONG_ASM_CONST(x)               0
 #endif
 
-#define CPU_FTR_SLB                     LONG_ASM_CONST(0x0000000100000000)
-#define CPU_FTR_16M_PAGE                LONG_ASM_CONST(0x0000000200000000)
-#define CPU_FTR_TLBIEL                  LONG_ASM_CONST(0x0000000400000000)
+
 #define CPU_FTR_HVMODE_206              LONG_ASM_CONST(0x0000000800000000)
 #define CPU_FTR_IABR                    LONG_ASM_CONST(0x0000002000000000)
 #define CPU_FTR_MMCRA                   LONG_ASM_CONST(0x0000004000000000)
 #define CPU_FTR_CTRL                    LONG_ASM_CONST(0x0000008000000000)
 #define CPU_FTR_SMT                     LONG_ASM_CONST(0x0000010000000000)
-#define CPU_FTR_LOCKLESS_TLBIE          LONG_ASM_CONST(0x0000040000000000)
-#define CPU_FTR_CI_LARGE_PAGE           LONG_ASM_CONST(0x0000100000000000)
 #define CPU_FTR_PAUSE_ZERO              LONG_ASM_CONST(0x0000200000000000)
 #define CPU_FTR_PURR                    LONG_ASM_CONST(0x0000400000000000)
 #define CPU_FTR_CELL_TB_BUG             LONG_ASM_CONST(0x0000800000000000)
 #define CPU_FTR_SPURR                   LONG_ASM_CONST(0x0001000000000000)
 #define CPU_FTR_DSCR                    LONG_ASM_CONST(0x0002000000000000)
-#define CPU_FTR_1T_SEGMENT              LONG_ASM_CONST(0x0004000000000000)
-#define CPU_FTR_NO_SLBIE_B              LONG_ASM_CONST(0x0008000000000000)
 #define CPU_FTR_VSX                     LONG_ASM_CONST(0x0010000000000000)
 #define CPU_FTR_SAO                     LONG_ASM_CONST(0x0020000000000000)
 #define CPU_FTR_CP_USE_DCBTZ            LONG_ASM_CONST(0x0040000000000000)
@@ -206,9 +200,10 @@ extern const char *powerpc_base_platform;
 
 #ifndef __ASSEMBLY__
 
-#define CPU_FTR_PPCAS_ARCH_V2   (CPU_FTR_SLB | \
-                                 CPU_FTR_TLBIEL | CPU_FTR_NOEXECUTE | \
-                                 CPU_FTR_NODSISRALIGN | CPU_FTR_16M_PAGE)
+#define CPU_FTR_PPCAS_ARCH_V2   (CPU_FTR_NOEXECUTE | CPU_FTR_NODSISRALIGN)
+
+#define MMU_FTR_PPCAS_ARCH_V2   (MMU_FTR_SLB | MMU_FTR_TLBIEL | \
+                                 MMU_FTR_16M_PAGE)
 
 /* We only set the altivec features if the kernel was compiled with altivec
  * support
@@ -408,38 +403,34 @@ extern const char *powerpc_base_platform;
 #define CPU_FTRS_POWER5 (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
             CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
             CPU_FTR_MMCRA | CPU_FTR_SMT | \
-            CPU_FTR_COHERENT_ICACHE | CPU_FTR_LOCKLESS_TLBIE | \
-            CPU_FTR_PURR | CPU_FTR_STCX_CHECKS_ADDRESS | \
-            CPU_FTR_POPCNTB)
+            CPU_FTR_COHERENT_ICACHE | CPU_FTR_PURR | \
+            CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB)
 #define CPU_FTRS_POWER6 (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
             CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
             CPU_FTR_MMCRA | CPU_FTR_SMT | \
-            CPU_FTR_COHERENT_ICACHE | CPU_FTR_LOCKLESS_TLBIE | \
+            CPU_FTR_COHERENT_ICACHE | \
             CPU_FTR_PURR | CPU_FTR_SPURR | CPU_FTR_REAL_LE | \
             CPU_FTR_DSCR | CPU_FTR_UNALIGNED_LD_STD | \
             CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB)
 #define CPU_FTRS_POWER7 (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
             CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | CPU_FTR_HVMODE_206 |\
             CPU_FTR_MMCRA | CPU_FTR_SMT | \
-            CPU_FTR_COHERENT_ICACHE | CPU_FTR_LOCKLESS_TLBIE | \
+            CPU_FTR_COHERENT_ICACHE | \
             CPU_FTR_PURR | CPU_FTR_SPURR | CPU_FTR_REAL_LE | \
             CPU_FTR_DSCR | CPU_FTR_SAO  | CPU_FTR_ASYM_SMT | \
             CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB | CPU_FTR_POPCNTD)
 #define CPU_FTRS_CELL   (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
             CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
             CPU_FTR_ALTIVEC_COMP | CPU_FTR_MMCRA | CPU_FTR_SMT | \
-            CPU_FTR_PAUSE_ZERO | CPU_FTR_CI_LARGE_PAGE | \
-            CPU_FTR_CELL_TB_BUG | CPU_FTR_CP_USE_DCBTZ | \
+            CPU_FTR_PAUSE_ZERO  | CPU_FTR_CELL_TB_BUG | CPU_FTR_CP_USE_DCBTZ | \
             CPU_FTR_UNALIGNED_LD_STD)
 #define CPU_FTRS_PA6T (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
-            CPU_FTR_PPCAS_ARCH_V2 | \
-            CPU_FTR_ALTIVEC_COMP | CPU_FTR_CI_LARGE_PAGE | \
-            CPU_FTR_PURR | CPU_FTR_REAL_LE | CPU_FTR_NO_SLBIE_B)
+            CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_ALTIVEC_COMP | \
+            CPU_FTR_PURR | CPU_FTR_REAL_LE)
 #define CPU_FTRS_COMPATIBLE     (CPU_FTR_USE_TB | CPU_FTR_PPCAS_ARCH_V2)
 
 #define CPU_FTRS_A2 (CPU_FTR_USE_TB | CPU_FTR_SMT | CPU_FTR_DBELL | \
-            CPU_FTR_TLBIEL | CPU_FTR_NOEXECUTE | CPU_FTR_NODSISRALIGN | \
-            CPU_FTR_16M_PAGE)
+                     CPU_FTR_NOEXECUTE | CPU_FTR_NODSISRALIGN)
 
 #ifdef __powerpc64__
 #ifdef CONFIG_PPC_BOOK3E
@@ -449,7 +440,7 @@ extern const char *powerpc_base_platform;
             (CPU_FTRS_POWER3 | CPU_FTRS_RS64 | CPU_FTRS_POWER4 |        \
             CPU_FTRS_PPC970 | CPU_FTRS_POWER5 | CPU_FTRS_POWER6 |       \
             CPU_FTRS_POWER7 | CPU_FTRS_CELL | CPU_FTRS_PA6T |           \
-            CPU_FTR_1T_SEGMENT | CPU_FTR_VSX)
+            CPU_FTR_VSX)
 #endif
 #else
 enum {
diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
index bb40a06d3b77..a39304b74f84 100644
--- a/arch/powerpc/include/asm/mmu.h
+++ b/arch/powerpc/include/asm/mmu.h
@@ -70,6 +70,54 @@
  */
 #define MMU_FTR_USE_PAIRED_MAS          ASM_CONST(0x01000000)
 
+/* MMU is SLB-based
+ */
+#define MMU_FTR_SLB                     ASM_CONST(0x02000000)
+
+/* Support 16M large pages
+ */
+#define MMU_FTR_16M_PAGE                ASM_CONST(0x04000000)
+
+/* Supports TLBIEL variant
+ */
+#define MMU_FTR_TLBIEL                  ASM_CONST(0x08000000)
+
+/* Supports tlbies w/o locking
+ */
+#define MMU_FTR_LOCKLESS_TLBIE          ASM_CONST(0x10000000)
+
+/* Large pages can be marked CI
+ */
+#define MMU_FTR_CI_LARGE_PAGE           ASM_CONST(0x20000000)
+
+/* 1T segments available
+ */
+#define MMU_FTR_1T_SEGMENT              ASM_CONST(0x40000000)
+
+/* Doesn't support the B bit (1T segment) in SLBIE
+ */
+#define MMU_FTR_NO_SLBIE_B              ASM_CONST(0x80000000)
+
+/* MMU feature bit sets for various CPUs */
+#define MMU_FTRS_DEFAULT_HPTE_ARCH_V2   \
+        MMU_FTR_HPTE_TABLE | MMU_FTR_PPCAS_ARCH_V2
+#define MMU_FTRS_POWER4         MMU_FTRS_DEFAULT_HPTE_ARCH_V2
+#define MMU_FTRS_PPC970         MMU_FTRS_POWER4
+#define MMU_FTRS_POWER5         MMU_FTRS_POWER4 | MMU_FTR_LOCKLESS_TLBIE
+#define MMU_FTRS_POWER6         MMU_FTRS_POWER4 | MMU_FTR_LOCKLESS_TLBIE
+#define MMU_FTRS_POWER7         MMU_FTRS_POWER4 | MMU_FTR_LOCKLESS_TLBIE | \
+                                MMU_FTR_TLBIE_206
+#define MMU_FTRS_CELL           MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \
+                                MMU_FTR_CI_LARGE_PAGE
+#define MMU_FTRS_PA6T           MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \
+                                MMU_FTR_CI_LARGE_PAGE | MMU_FTR_NO_SLBIE_B
+#define MMU_FTRS_A2             MMU_FTR_TYPE_3E | MMU_FTR_USE_TLBILX | \
+                                MMU_FTR_USE_TLBIVAX_BCAST | \
+                                MMU_FTR_LOCK_BCAST_INVAL | \
+                                MMU_FTR_USE_TLBRSRV | \
+                                MMU_FTR_USE_PAIRED_MAS | \
+                                MMU_FTR_TLBIEL | \
+                                MMU_FTR_16M_PAGE
 #ifndef __ASSEMBLY__
 #include <asm/cputable.h>
 
diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
index 81fb41289d6c..8e13f65b498c 100644
--- a/arch/powerpc/include/asm/mmu_context.h
+++ b/arch/powerpc/include/asm/mmu_context.h
@@ -67,7 +67,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
          * sub architectures.
          */
 #ifdef CONFIG_PPC_STD_MMU_64
-        if (cpu_has_feature(CPU_FTR_SLB))
+        if (mmu_has_feature(MMU_FTR_SLB))
                 switch_slb(tsk, next);
         else
                 switch_stab(tsk, next);