diff options
| author | Haren Myneni <haren@linux.vnet.ibm.com> | 2012-12-06 21:49:56 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-01-10 17:01:08 +1100 |
| commit | 92779245599bb3d7fb48066b11c4bfd6aa477198 (patch) | |
| tree | bea152148a83002c420fd92e59aac37bb8f18f70 /arch/powerpc | |
| parent | a09688cd23d477ebd9c8f57881bfe907240cb0a1 (diff) | |
| download | linux-92779245599bb3d7fb48066b11c4bfd6aa477198.tar.gz linux-92779245599bb3d7fb48066b11c4bfd6aa477198.tar.bz2 linux-92779245599bb3d7fb48066b11c4bfd6aa477198.zip | |
powerpc: Define ppr in thread_struct
[PATCH 4/6] powerpc: Define ppr in thread_struct
ppr in thread_struct is used to save PPR and restore it before process exits
from kernel.
This patch sets the default priority to 3 when tasks are created such
that users can use 4 for higher priority tasks.
Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/processor.h | 12 | ||||
| -rw-r--r-- | arch/powerpc/kernel/asm-offsets.c | 1 | ||||
| -rw-r--r-- | arch/powerpc/kernel/process.c | 2 |
3 files changed, 15 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h index 87502046c0dc..37f87f069cbf 100644 --- a/arch/powerpc/include/asm/processor.h +++ b/arch/powerpc/include/asm/processor.h @@ -18,6 +18,16 @@ #define TS_FPRWIDTH 1 #endif +#ifdef CONFIG_PPC64 +/* Default SMT priority is set to 3. Use 11- 13bits to save priority. */ +#define PPR_PRIORITY 3 +#ifdef __ASSEMBLY__ +#define INIT_PPR (PPR_PRIORITY << 50) +#else +#define INIT_PPR ((u64)PPR_PRIORITY << 50) +#endif /* __ASSEMBLY__ */ +#endif /* CONFIG_PPC64 */ + #ifndef __ASSEMBLY__ #include <linux/compiler.h> #include <linux/cache.h> @@ -245,6 +255,7 @@ struct thread_struct { #ifdef CONFIG_PPC64 unsigned long dscr; int dscr_inherit; + unsigned long ppr; /* used to save/restore SMT priority */ #endif }; @@ -278,6 +289,7 @@ struct thread_struct { .fpr = {{0}}, \ .fpscr = { .val = 0, }, \ .fpexc_mode = 0, \ + .ppr = INIT_PPR, \ } #endif diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 4e23ba2f3ca7..e39ca556e87f 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -77,6 +77,7 @@ int main(void) DEFINE(NMI_MASK, NMI_MASK); DEFINE(THREAD_DSCR, offsetof(struct thread_struct, dscr)); DEFINE(THREAD_DSCR_INHERIT, offsetof(struct thread_struct, dscr_inherit)); + DEFINE(TASKTHREADPPR, offsetof(struct task_struct, thread.ppr)); #else DEFINE(THREAD_INFO, offsetof(struct task_struct, stack)); #endif /* CONFIG_PPC64 */ diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 81430674e71c..3065d17f3606 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -813,6 +813,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, p->thread.dscr_inherit = current->thread.dscr_inherit; p->thread.dscr = current->thread.dscr; } + if (cpu_has_feature(CPU_FTR_HAS_PPR)) + p->thread.ppr = INIT_PPR; #endif /* * The PPC64 ABI makes use of a TOC to contain function |