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[PATCH v2 5/6] MIPS: math-emu: Add FP emu debugfs clear functionality

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

Add capability for the user to clear all FP emu debugfs counters.

This is achieved by having a special debugfs file "fpuemustats_clear"
(under default location "/sys/kernel/debug/mips"). Each access to the
file results in setting all counters to zero (it is enough, let's say,
to issue a "cat /sys/kernel/debug/mips/fpuemustats_clear").

This functionality already exists for R2 emulation statistics,
but was missing for FP emulation statistics. The implementation in
this patch is consistent with its R2 emulation counterpart.

Signed-off-by: Miodrag Dinic <miodrag.dinic@imgtec.com>
Signed-off-by: Goran Ferenc <goran.ferenc@imgtec.com>
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
---
 arch/mips/math-emu/me-debugfs.c | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/arch/mips/math-emu/me-debugfs.c b/arch/mips/math-emu/me-debugfs.c
index 78b26c8..f080493 100644
--- a/arch/mips/math-emu/me-debugfs.c
+++ b/arch/mips/math-emu/me-debugfs.c
@@ -28,15 +28,51 @@ static int fpuemu_stat_get(void *data, u64 *val)
 }
 DEFINE_SIMPLE_ATTRIBUTE(fops_fpuemu_stat, fpuemu_stat_get, NULL, "%llu\n");
 
+static int fpuemustats_clear_show(struct seq_file *s, void *unused)
+{
+	__this_cpu_write((fpuemustats).emulated, 0);
+	__this_cpu_write((fpuemustats).loads, 0);
+	__this_cpu_write((fpuemustats).stores, 0);
+	__this_cpu_write((fpuemustats).branches, 0);
+	__this_cpu_write((fpuemustats).cp1ops, 0);
+	__this_cpu_write((fpuemustats).cp1xops, 0);
+	__this_cpu_write((fpuemustats).errors, 0);
+	__this_cpu_write((fpuemustats).ieee754_inexact, 0);
+	__this_cpu_write((fpuemustats).ieee754_underflow, 0);
+	__this_cpu_write((fpuemustats).ieee754_overflow, 0);
+	__this_cpu_write((fpuemustats).ieee754_zerodiv, 0);
+	__this_cpu_write((fpuemustats).ieee754_invalidop, 0);
+	__this_cpu_write((fpuemustats).ds_emul, 0);
+
+	return 0;
+}
+
+static int fpuemustats_clear_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, fpuemustats_clear_show, inode->i_private);
+}
+
+static const struct file_operations fpuemustats_clear_fops = {
+	.open                   = fpuemustats_clear_open,
+	.read			= seq_read,
+	.llseek			= seq_lseek,
+	.release		= single_release,
+};
+
 static int __init debugfs_fpuemu(void)
 {
-	struct dentry *d, *dir;
+	struct dentry *d, *dir, *reset_file;
 
 	if (!mips_debugfs_dir)
 		return -ENODEV;
 	dir = debugfs_create_dir("fpuemustats", mips_debugfs_dir);
 	if (!dir)
 		return -ENOMEM;
+	reset_file = debugfs_create_file("fpuemustats_clear", 0444,
+					 mips_debugfs_dir, NULL,
+					 &fpuemustats_clear_fops);
+	if (!reset_file)
+		return -ENOMEM;
 
 #define FPU_EMU_STAT_OFFSET(m)						\
 	offsetof(struct mips_fpu_emulator_stats, m)
-- 
2.9.3

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[PATCH v2 0/6] MIPS: math-emu: FP emulation fixes and improvements Aleksandar Markovic <aleksandar.markovic@rt-rk.com> - 2017-08-21 14:30 +0200
  [PATCH v2 2/6] MIPS: math-emu: RINT.<D|S>: Fix several problems by reimplementation Aleksandar Markovic <aleksandar.markovic@rt-rk.com> - 2017-08-21 14:30 +0200
  [PATCH v2 1/6] MIPS: math-emu: CMP.Sxxx.<D|S>: Prevent occurrences of SIGILL crashes Aleksandar Markovic <aleksandar.markovic@rt-rk.com> - 2017-08-21 14:30 +0200
  [PATCH v2 3/6] MIPS: math-emu: CLASS.D: Zero bits 32-63 of the result Aleksandar Markovic <aleksandar.markovic@rt-rk.com> - 2017-08-21 14:40 +0200
  [PATCH v2 4/6] MIPS: math-emu: Add FP emu debugfs statistics for branches Aleksandar Markovic <aleksandar.markovic@rt-rk.com> - 2017-08-21 14:40 +0200
  [PATCH v2 5/6] MIPS: math-emu: Add FP emu debugfs clear functionality Aleksandar Markovic <aleksandar.markovic@rt-rk.com> - 2017-08-21 14:40 +0200
  [PATCH v2 6/6] MIPS: math-emu: Add FP emu debugfs stats for individual instructions Aleksandar Markovic <aleksandar.markovic@rt-rk.com> - 2017-08-21 14:40 +0200

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