[PATCH 06/17] powerpc: Add transactional memory paca scratch register to show_regs

[Michael Neuling]

Add transactional memory paca scratch register to show_regs.  This is useful
for debugging.

Signed-off-by: Matt Evans <matt at ozlabs.org>
Signed-off-by: Michael Neuling <mikey at neuling.org>
---
 arch/powerpc/include/asm/paca.h   |    3 +++
 arch/powerpc/kernel/asm-offsets.c |    1 +
 arch/powerpc/kernel/entry_64.S    |    4 ++++
 arch/powerpc/kernel/process.c     |    3 +++
 4 files changed, 11 insertions(+)

diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h
index c47d687..4cbcc7d 100644
--- a/arch/powerpc/include/asm/paca.h
+++ b/arch/powerpc/include/asm/paca.h
@@ -137,6 +137,9 @@ struct paca_struct {
 	u8 irq_work_pending;		/* IRQ_WORK interrupt while soft-disable */
 	u8 nap_state_lost;		/* NV GPR values lost in power7_idle */
 	u64 sprg3;			/* Saved user-visible sprg */
+#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
+	u64 tm_scratch;                 /* TM scratch area for reclaim */
+#endif
 
 #ifdef CONFIG_PPC_POWERNV
 	/* Pointer to OPAL machine check event structure set by the
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index b67e4c3..f9654b6 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -126,6 +126,7 @@ int main(void)
 	DEFINE(THREAD_TAR, offsetof(struct thread_struct, tar));
 #endif
 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
+	DEFINE(PACATMSCRATCH, offsetof(struct paca_struct, tm_scratch));
 	DEFINE(THREAD_TM_TFHAR, offsetof(struct thread_struct, tm_tfhar));
 	DEFINE(THREAD_TM_TEXASR, offsetof(struct thread_struct, tm_texasr));
 	DEFINE(THREAD_TM_TFIAR, offsetof(struct thread_struct, tm_tfiar));
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 9ae8451..612ea13 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -785,6 +785,10 @@ fast_exception_return:
 	andc	r4,r4,r0	 /* r0 contains MSR_RI here */
 	mtmsrd	r4,1
 
+#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
+	/* TM debug */
+	std	r3, PACATMSCRATCH(r13) /* Stash returned-to MSR */
+#endif
 	/*
 	 * r13 is our per cpu area, only restore it if we are returning to
 	 * userspace the value stored in the stack frame may belong to
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index b0a0321..1cc4053 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -754,6 +754,9 @@ void show_regs(struct pt_regs * regs)
 	printk("NIP ["REG"] %pS\n", regs->nip, (void *)regs->nip);
 	printk("LR ["REG"] %pS\n", regs->link, (void *)regs->link);
 #endif
+#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
+	printk("PACATMSCRATCH [%llx]\n", get_paca()->tm_scratch);
+#endif
 	show_stack(current, (unsigned long *) regs->gpr[1]);
 	if (!user_mode(regs))
 		show_instructions(regs);
-- 
1.7.10.4