diff options
| author | Alexey Kardashevskiy <aik@au1.ibm.com> | 2011-03-02 15:18:48 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-04-27 14:18:19 +1000 |
| commit | efcac6589a277c10060e4be44b9455cf43838dc1 (patch) | |
| tree | d2236c1e9385baff297f0652c5a22b74f6acb149 /arch/powerpc/include/asm/processor.h | |
| parent | f0aae3238fc1c28b543cbaaa0e7c5d57685f5f89 (diff) | |
| download | linux-efcac6589a277c10060e4be44b9455cf43838dc1.tar.bz2 | |
powerpc: Per process DSCR + some fixes (try#4)
The DSCR (aka Data Stream Control Register) is supported on some
server PowerPC chips and allow some control over the prefetch
of data streams.
This patch allows the value to be specified per thread by emulating
the corresponding mfspr and mtspr instructions. Children of such
threads inherit the value. Other threads use a default value that
can be specified in sysfs - /sys/devices/system/cpu/dscr_default.
If a thread starts with non default value in the sysfs entry,
all children threads inherit this non default value even if
the sysfs value is changed later.
Signed-off-by: Alexey Kardashevskiy <aik@au1.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/processor.h')
| -rw-r--r-- | arch/powerpc/include/asm/processor.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h index de1967a1ff57..d50c2b6d9bc3 100644 --- a/arch/powerpc/include/asm/processor.h +++ b/arch/powerpc/include/asm/processor.h @@ -238,6 +238,10 @@ struct thread_struct { #ifdef CONFIG_KVM_BOOK3S_32_HANDLER void* kvm_shadow_vcpu; /* KVM internal data */ #endif /* CONFIG_KVM_BOOK3S_32_HANDLER */ +#ifdef CONFIG_PPC64 + unsigned long dscr; + int dscr_inherit; +#endif }; #define ARCH_MIN_TASKALIGN 16 |