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| author | Cyril Bur <cyrilbur@gmail.com> | 2016-02-29 07:53:50 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-03-02 13:34:49 +0100 |
| commit | 6f515d842e8e1b205e54f44b9013bf14870b97a7 (patch) | |
| tree | 34f133da5b1cd6922f2728645db025bcc81b4183 /arch/powerpc/kernel/process.c | |
| parent | powerpc: Add the ability to save FPU without giving it up (diff) | |
| download | linux-6f515d842e8e1b205e54f44b9013bf14870b97a7.tar.xz linux-6f515d842e8e1b205e54f44b9013bf14870b97a7.zip | |
powerpc: Add the ability to save Altivec without giving it up
This patch adds the ability to be able to save the VEC registers to the
thread struct without giving up (disabling the facility) next time the
process returns to userspace.
This patch builds on a previous optimisation for the FPU registers in the
thread copy path to avoid a possibly pointless reload of VEC state.
Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index a7e5061187e8..14c09d25de98 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -213,6 +213,16 @@ static int restore_fp(struct task_struct *tsk) { return 0; } #ifdef CONFIG_ALTIVEC #define loadvec(thr) ((thr).load_vec) +static void __giveup_altivec(struct task_struct *tsk) +{ + save_altivec(tsk); + tsk->thread.regs->msr &= ~MSR_VEC; +#ifdef CONFIG_VSX + if (cpu_has_feature(CPU_FTR_VSX)) + tsk->thread.regs->msr &= ~MSR_VSX; +#endif +} + void giveup_altivec(struct task_struct *tsk) { check_if_tm_restore_required(tsk); @@ -472,7 +482,7 @@ void save_all(struct task_struct *tsk) save_fpu(tsk); if (usermsr & MSR_VEC) - __giveup_altivec(tsk); + save_altivec(tsk); if (usermsr & MSR_VSX) __giveup_vsx(tsk); |