[PATCH 4/6] powerpc: Define ppr in thread_struct

[Haren Myneni <haren@linux.vnet.ibm.com>]

[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>
---
 arch/powerpc/include/asm/processor.h |   12 ++++++++++++
 arch/powerpc/kernel/asm-offsets.c    |    1 +
 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 8750204..37f87f0 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 7523539..41f65ec 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 ba48233..2563acc 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -814,6 +814,8 @@ 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 
-- 
1.7.1