diff options
| author | Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> | 2017-11-07 18:23:54 -0800 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-11-12 09:03:09 +1100 |
| commit | 9d2a4d71332cfdf4ea90754ad9b2f05a5ee5f6c7 (patch) | |
| tree | b31b08a67de28433232370862cfd128707a10838 /arch/powerpc/include | |
| parent | ec233ede4c8654894610ea54f4dae7adc954ac62 (diff) | |
powerpc: Define set_thread_uses_vas()
A CP_ABORT instruction is required in processes that have mapped a VAS
"paste address" with the intention of using COPY/PASTE instructions.
But since CP_ABORT is expensive, we want to restrict it to only
processes that use/intend to use COPY/PASTE.
Define an interface, set_thread_uses_vas(), that VAS can use to
indicate that the current process opened a send window. During context
switch, issue CP_ABORT only for processes that have the flag set.
Thanks for input from Nick Piggin, Michael Ellerman.
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
[mpe: Fix to not use new_thread after _switch() returns]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/processor.h | 2 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/switch_to.h | 2 |
2 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h index 58cc21274423..bdab3b74eb98 100644 --- a/arch/powerpc/include/asm/processor.h +++ b/arch/powerpc/include/asm/processor.h @@ -341,7 +341,9 @@ struct thread_struct { unsigned long sier; unsigned long mmcr2; unsigned mmcr0; + unsigned used_ebb; + unsigned int used_vas; #endif }; diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h index f5da32f43fed..07ff06e9dae1 100644 --- a/arch/powerpc/include/asm/switch_to.h +++ b/arch/powerpc/include/asm/switch_to.h @@ -91,6 +91,8 @@ static inline void clear_task_ebb(struct task_struct *t) #endif } +extern int set_thread_uses_vas(void); + extern int set_thread_tidr(struct task_struct *t); extern void clear_thread_tidr(struct task_struct *t); |