powerpc/64: Reclaim CPU_FTR_SUBCORE

We are running low on CPU feature bits, so we only want to use them when
it's really necessary.

CPU_FTR_SUBCORE is only used in one place, and only in C, so we don't
need it in order to make asm patching work. It can only be set on
"Power8" CPUs, which in practice means POWER8, POWER8E and POWER8NVL.
There are no plans to implement it on future CPUs, but if there ever
were we could retrofit it then.

Although KVM uses subcores, it never looks at the CPU feature, it either
looks at the ISA level or the threads_per_subcore value.

So drop the CPU feature and do a PVR check instead. Drop the device tree
"subcore" feature as we no longer support doing anything with it, and we
will drop it from skiboot too.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index c2d5095..d02ad93 100644 (file)
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -214,7 +214,6 @@ enum {
 #define CPU_FTR_DAWR                   LONG_ASM_CONST(0x0400000000000000)
 #define CPU_FTR_DABRX                  LONG_ASM_CONST(0x0800000000000000)
 #define CPU_FTR_PMAO_BUG               LONG_ASM_CONST(0x1000000000000000)
-#define CPU_FTR_SUBCORE                        LONG_ASM_CONST(0x2000000000000000)
 #define CPU_FTR_POWER9_DD1             LONG_ASM_CONST(0x4000000000000000)
 
 #ifndef __ASSEMBLY__
@@ -463,7 +462,7 @@ enum {
            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_HAS_PPR | CPU_FTR_DAWR | \
-           CPU_FTR_ARCH_207S | CPU_FTR_TM_COMP | CPU_FTR_SUBCORE)
+           CPU_FTR_ARCH_207S | CPU_FTR_TM_COMP)
 #define CPU_FTRS_POWER8E (CPU_FTRS_POWER8 | CPU_FTR_PMAO_BUG)
 #define CPU_FTRS_POWER8_DD1 (CPU_FTRS_POWER8 & ~CPU_FTR_DBELL)
 #define CPU_FTRS_POWER9 (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \

diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
index 76eebba..4c7656d 100644 (file)
--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -643,7 +643,6 @@ static struct dt_cpu_feature_match __initdata
        {"processor-control-facility", feat_enable_dbell, CPU_FTR_DBELL},
        {"processor-control-facility-v3", feat_enable_dbell, CPU_FTR_DBELL},
        {"processor-utilization-of-resources-register", feat_enable_purr, 0},
-       {"subcore", feat_enable, CPU_FTR_SUBCORE},
        {"no-execute", feat_enable, 0},
        {"strong-access-ordering", feat_enable, CPU_FTR_SAO},
        {"cache-inhibited-large-page", feat_enable_large_ci, 0},

diff --git a/arch/powerpc/platforms/powernv/subcore.c b/arch/powerpc/platforms/powernv/subcore.c
index 0babef1..8c61192 100644 (file)
--- a/arch/powerpc/platforms/powernv/subcore.c
+++ b/arch/powerpc/platforms/powernv/subcore.c
@@ -407,7 +407,13 @@ static DEVICE_ATTR(subcores_per_core, 0644,
 
 static int subcore_init(void)
 {
-       if (!cpu_has_feature(CPU_FTR_SUBCORE))
+       unsigned pvr_ver;
+
+       pvr_ver = PVR_VER(mfspr(SPRN_PVR));
+
+       if (pvr_ver != PVR_POWER8 &&
+           pvr_ver != PVR_POWER8E &&
+           pvr_ver != PVR_POWER8NVL)
                return 0;
 
        /*