[PATCH v2 4/6] MIPS: math-emu: Add FP emu debugfs statistics for branches

[Aleksandar Markovic]

From: Aleksandar Markovic <aleksandar.marko...@imgtec.com>

Add FP emu debugfs counter for branches.

The new counter is displayed the same way as existing counter, and
its default path is /sys/kernel/debug/mips/fpuemustats/.

The limitation of this counter is that it counts only R6 branch
instructions BC1NEZ and BC1EQZ.

Signed-off-by: Miodrag Dinic <miodrag.di...@imgtec.com>
Signed-off-by: Goran Ferenc <goran.fer...@imgtec.com>
Signed-off-by: Aleksandar Markovic <aleksandar.marko...@imgtec.com>
---
 arch/mips/include/asm/fpu_emulator.h | 1 +
 arch/mips/math-emu/cp1emu.c          | 1 +
 arch/mips/math-emu/me-debugfs.c      | 1 +
 3 files changed, 3 insertions(+)

diff --git a/arch/mips/include/asm/fpu_emulator.h 
b/arch/mips/include/asm/fpu_emulator.h
index c05369e..7f5cf1f 100644
--- a/arch/mips/include/asm/fpu_emulator.h
+++ b/arch/mips/include/asm/fpu_emulator.h
@@ -36,6 +36,7 @@ struct mips_fpu_emulator_stats {
        unsigned long emulated;
        unsigned long loads;
        unsigned long stores;
+       unsigned long branches;
        unsigned long cp1ops;
        unsigned long cp1xops;
        unsigned long errors;
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index 1ad15f8..40c74e1 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -1230,6 +1230,7 @@ static int cop1Emulate(struct pt_regs *xcp, struct 
mips_fpu_struct *ctx,
                                break;
                        }
 branch_common:
+                       MIPS_FPU_EMU_INC_STATS(branches);
                        set_delay_slot(xcp);
                        if (cond) {
                                /*
diff --git a/arch/mips/math-emu/me-debugfs.c b/arch/mips/math-emu/me-debugfs.c
index be650ed..78b26c8 100644
--- a/arch/mips/math-emu/me-debugfs.c
+++ b/arch/mips/math-emu/me-debugfs.c
@@ -53,6 +53,7 @@ do {                                                          
        \
        FPU_STAT_CREATE(emulated);
        FPU_STAT_CREATE(loads);
        FPU_STAT_CREATE(stores);
+       FPU_STAT_CREATE(branches);
        FPU_STAT_CREATE(cp1ops);
        FPU_STAT_CREATE(cp1xops);
        FPU_STAT_CREATE(errors);
-- 
2.9.3