From 2707cd293cc2386f8eea6fee1ba72e8b190f25cc Mon Sep 17 00:00:00 2001
From: David Daney <david.daney@cavium.com>
Date: Wed, 3 Dec 2014 11:12:23 -0800
Subject: [PATCH] MIPS: Add FPU emulator counter for emulated delay slots.
Delay slot emulation in the FPU emulator is the only kernel user of an
executable stack, it is also very slow. Add a counter so we can see
how many of these emulations are done.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8634/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
arch/mips/include/asm/fpu_emulator.h | 1 +
arch/mips/math-emu/dsemul.c | 2 +-
arch/mips/math-emu/me-debugfs.c | 1 +
3 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/mips/include/asm/fpu_emulator.h b/arch/mips/include/asm/fpu_emulator.h
index 3ee347713307..6370c82eb5e1 100644
--- a/arch/mips/include/asm/fpu_emulator.h
+++ b/arch/mips/include/asm/fpu_emulator.h
@@ -44,6 +44,7 @@ struct mips_fpu_emulator_stats {
unsigned long ieee754_overflow;
unsigned long ieee754_zerodiv;
unsigned long ieee754_invalidop;
+ unsigned long ds_emul;
};
DECLARE_PER_CPU(struct mips_fpu_emulator_stats, fpuemustats);
diff --git a/arch/mips/math-emu/dsemul.c b/arch/mips/math-emu/dsemul.c
index 4f514f3724cb..58f58185f1c4 100644
--- a/arch/mips/math-emu/dsemul.c
+++ b/arch/mips/math-emu/dsemul.c
@@ -158,6 +158,6 @@ int do_dsemulret(struct pt_regs *xcp)
/* Set EPC to return to post-branch instruction */
xcp->cp0_epc = epc;
-
+ MIPS_FPU_EMU_INC_STATS(ds_emul);
return 1;
}
diff --git a/arch/mips/math-emu/me-debugfs.c b/arch/mips/math-emu/me-debugfs.c
index becdd63e14a9..f308e0f05fc5 100644
--- a/arch/mips/math-emu/me-debugfs.c
+++ b/arch/mips/math-emu/me-debugfs.c
@@ -61,6 +61,7 @@ do { \
FPU_STAT_CREATE(ieee754_overflow);
FPU_STAT_CREATE(ieee754_zerodiv);
FPU_STAT_CREATE(ieee754_invalidop);
+ FPU_STAT_CREATE(ds_emul);
return 0;
}