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powerpc/64s: Remove ICSWX feature from Power9

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Power9 does not implement the icswx instruction. This CPU feature is not visible
to userspace and is only used in the CONFIG_PPC_ICSWX code, which is generally
not enabled, and can only be triggered by other code using icswx, which should
not happen on Power9 systems in the first place. So impact should be minimal.

Fixes: c3ab300ea5 ("powerpc: Add POWER9 cputable entry")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2017-04-19 12:27:37 +10:00 committed by Michael Ellerman
parent f2080b9ac3
commit 2384d2d7ad
2 changed files with 3 additions and 2 deletions
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2
arch/powerpc/include/asm/cputable.h
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@ -471,7 +471,7 @@ enum {
CPU_FTR_PURR | CPU_FTR_SPURR | CPU_FTR_REAL_LE | \
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_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_ARCH_300)
#define CPU_FTRS_POWER9_DD1 (CPU_FTRS_POWER9 | CPU_FTR_POWER9_DD1)

3
arch/powerpc/platforms/Kconfig.cputype
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@ -279,7 +279,8 @@ config PPC_ICSWX
This option enables kernel support for the PowerPC Initiate
Coprocessor Store Word (icswx) coprocessor instruction on POWER7
or newer processors.
and POWER8 processors. POWER9 uses new copy/paste instructions
to invoke the coprocessor.
This option is only useful if you have a processor that supports
the icswx coprocessor instruction. It does not have any effect