powerpc: Enable PPR save/restore

[PATCH 2/6] powerpc: Enable PPR save/restore

SMT thread status register (PPR) is used to set thread priority. This patch
enables PPR save/restore feature (CPU_FTR_HAS_PPR) on POWER7 and POWER8 systems.

Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index fc4d2c5..8dbf8bb 100644 (file)
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -171,6 +171,7 @@ extern const char *powerpc_base_platform;
 #define CPU_FTR_POPCNTD                        LONG_ASM_CONST(0x0800000000000000)
 #define CPU_FTR_ICSWX                  LONG_ASM_CONST(0x1000000000000000)
 #define CPU_FTR_VMX_COPY               LONG_ASM_CONST(0x2000000000000000)
+#define        CPU_FTR_HAS_PPR                 LONG_ASM_CONST(0x4000000000000000)
 
 #ifndef __ASSEMBLY__
 
@@ -400,7 +401,8 @@ extern const char *powerpc_base_platform;
            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 | \
-           CPU_FTR_ICSWX | CPU_FTR_CFAR | CPU_FTR_HVMODE | CPU_FTR_VMX_COPY)
+           CPU_FTR_ICSWX | CPU_FTR_CFAR | CPU_FTR_HVMODE | \
+           CPU_FTR_VMX_COPY | CPU_FTR_HAS_PPR)
 #define CPU_FTRS_POWER8 (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
            CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | CPU_FTR_ARCH_206 |\
            CPU_FTR_MMCRA | CPU_FTR_SMT | \
@@ -409,7 +411,7 @@ extern const char *powerpc_base_platform;
            CPU_FTR_DSCR | CPU_FTR_SAO  | \
            CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB | CPU_FTR_POPCNTD | \
            CPU_FTR_ICSWX | CPU_FTR_CFAR | CPU_FTR_HVMODE | CPU_FTR_VMX_COPY | \
-           CPU_FTR_DBELL)
+           CPU_FTR_DBELL | CPU_FTR_HAS_PPR)
 #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 | \