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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-05-14 13:14:53 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-06-16 00:16:47 +1000 |
| commit | 359c2ca74d2fede5c571fbf3f5ee16ba1ad98259 (patch) | |
| tree | aa1e00c52ff5d2dc679fe35f1afce5e2c926644e /arch/powerpc/kernel/process.c | |
| parent | 4423eff71ca6b8f2c5e0fc4cea33d8cdfe3c3740 (diff) | |
| download | linux-359c2ca74d2fede5c571fbf3f5ee16ba1ad98259.tar.gz | |
powerpc: Don't handle ALTIVEC/SPE in ASM in _switch(). Do it in C.
_switch() saves and restores ALTIVEC and SPE status.
For altivec this is redundant with what __switch_to() does with
save_sprs() and restore_sprs() and giveup_all() before
calling _switch().
Add support for SPI in save_sprs() and restore_sprs() and
remove things from _switch().
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/8ab21fd93d6e0047aa71e6509e5e312f14b2991b.1620998075.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 89e34aa273e21..2bd30acc843c2 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1129,6 +1129,10 @@ static inline void save_sprs(struct thread_struct *t) if (cpu_has_feature(CPU_FTR_ALTIVEC)) t->vrsave = mfspr(SPRN_VRSAVE); #endif +#ifdef CONFIG_SPE + if (cpu_has_feature(CPU_FTR_SPE)) + t->spefscr = mfspr(SPRN_SPEFSCR); +#endif #ifdef CONFIG_PPC_BOOK3S_64 if (cpu_has_feature(CPU_FTR_DSCR)) t->dscr = mfspr(SPRN_DSCR); @@ -1159,6 +1163,11 @@ static inline void restore_sprs(struct thread_struct *old_thread, old_thread->vrsave != new_thread->vrsave) mtspr(SPRN_VRSAVE, new_thread->vrsave); #endif +#ifdef CONFIG_SPE + if (cpu_has_feature(CPU_FTR_SPE) && + old_thread->spefscr != new_thread->spefscr) + mtspr(SPRN_SPEFSCR, new_thread->spefscr); +#endif #ifdef CONFIG_PPC_BOOK3S_64 if (cpu_has_feature(CPU_FTR_DSCR)) { u64 dscr = get_paca()->dscr_default; |