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powerpc: Create mtmsrd_isync() 

mtmsrd_isync() will do an mtmsrd followed by an isync on older
processors. On newer processors we avoid the isync via a feature fixup.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anton Blanchard 2015-10-29 11:43:59 +11:00 committed by Michael Ellerman
parent b86fd2bd03
commit 611b0e5c19
2 changed files with 30 additions and 8 deletions
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8
arch/powerpc/include/asm/reg.h
View File

@ -1193,12 +1193,20 @@
#define __mtmsrd(v, l) asm volatile("mtmsrd %0," __stringify(l) \
: : "r" (v) : "memory")
#define mtmsr(v) __mtmsrd((v), 0)
#define __MTMSR "mtmsrd"
#else
#define mtmsr(v) asm volatile("mtmsr %0" : \
: "r" ((unsigned long)(v)) \
: "memory")
#define __MTMSR "mtmsr"
#endif
static inline void mtmsr_isync(unsigned long val)
{
asm volatile(__MTMSR " %0; " ASM_FTR_IFCLR("isync", "nop", %1) : :
"r" (val), "i" (CPU_FTR_ARCH_206) : "memory");
}
#define mfspr(rn) ({unsigned long rval; \
asm volatile("mfspr %0," __stringify(rn) \
: "=r" (rval)); rval;})

30
arch/powerpc/kernel/process.c
View File

@ -130,7 +130,10 @@ void enable_kernel_fp(void)
check_if_tm_restore_required(current);
giveup_fpu(current);
} else {
giveup_fpu(NULL); /* just enables FP for kernel */
u64 oldmsr = mfmsr();
if (!(oldmsr & MSR_FP))
mtmsr_isync(oldmsr | MSR_FP);
}
}
EXPORT_SYMBOL(enable_kernel_fp);
@ -144,7 +147,10 @@ void enable_kernel_altivec(void)
check_if_tm_restore_required(current);
giveup_altivec(current);
} else {
giveup_altivec_notask();
u64 oldmsr = mfmsr();
if (!(oldmsr & MSR_VEC))
mtmsr_isync(oldmsr | MSR_VEC);
}
}
EXPORT_SYMBOL(enable_kernel_altivec);
@ -173,10 +179,14 @@ void enable_kernel_vsx(void)
{
WARN_ON(preemptible());
if (current->thread.regs && (current->thread.regs->msr & MSR_VSX))
if (current->thread.regs && (current->thread.regs->msr & MSR_VSX)) {
giveup_vsx(current);
else
giveup_vsx(NULL); /* just enable vsx for kernel - force */
} else {
u64 oldmsr = mfmsr();
if (!(oldmsr & MSR_VSX))
mtmsr_isync(oldmsr | MSR_VSX);
}
}
EXPORT_SYMBOL(enable_kernel_vsx);
@ -209,10 +219,14 @@ void enable_kernel_spe(void)
{
WARN_ON(preemptible());
if (current->thread.regs && (current->thread.regs->msr & MSR_SPE))
if (current->thread.regs && (current->thread.regs->msr & MSR_SPE)) {
giveup_spe(current);
else
giveup_spe(NULL); /* just enable SPE for kernel - force */
} else {
u64 oldmsr = mfmsr();
if (!(oldmsr & MSR_SPE))
mtmsr_isync(oldmsr | MSR_SPE);
}
}
EXPORT_SYMBOL(enable_kernel_spe);