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>

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