From eef4e499042792c0f16e12d0674d50c4e53f9f72 Mon Sep 17 00:00:00 2001
From: Slawomir Jankowski <slawomir.jankowski@intel.com>
Date: Mon, 8 Feb 2021 10:16:25 +0100
Subject: [PATCH] Use time since epoch instead of jiffies If time is counted in
 jiffies, machine reboot brokes `dirty for` statistic for caches loaded at
 boot. The counter overflows and `dirty for` shows some huge values. Cast
 ticks to unsigned long. Add necessary header. Move `env_msleep` to `TIME`
 subgroup of header. Move `env_time_after` below time converting functions.

Signed-off-by: Slawomir Jankowski <slawomir.jankowski@intel.com>
---
 modules/cas_cache/linux_kernel_version.h |  1 +
 modules/cas_cache/ocf_env.h              | 45 ++++++++++++++----------
 2 files changed, 27 insertions(+), 19 deletions(-)

diff --git a/modules/cas_cache/linux_kernel_version.h b/modules/cas_cache/linux_kernel_version.h
index 4520e43..8e59b88 100644
--- a/modules/cas_cache/linux_kernel_version.h
+++ b/modules/cas_cache/linux_kernel_version.h
@@ -39,6 +39,7 @@
 #include <linux/ratelimit.h>
 #include <linux/mm.h>
 #include <linux/blk-mq.h>
+#include <linux/time.h>
 
 #include "generated_defines.h"
 
diff --git a/modules/cas_cache/ocf_env.h b/modules/cas_cache/ocf_env.h
index 46721d2..60a130d 100644
--- a/modules/cas_cache/ocf_env.h
+++ b/modules/cas_cache/ocf_env.h
@@ -539,17 +539,34 @@ static inline int env_in_interrupt(void)
 /* *** TIME *** */
 static inline uint64_t env_get_tick_count(void)
 {
-	return jiffies;
-}
-
-static inline uint64_t env_ticks_to_msecs(uint64_t j)
-{
-	return jiffies_to_msecs(j);
+	struct timespec ts;
+	getnstimeofday(&ts);
+	return ts.tv_sec * 1000000000UL + ts.tv_nsec;
 }
 
 static inline uint64_t env_ticks_to_nsecs(uint64_t j)
 {
-	return jiffies_to_usecs(j) * NSEC_PER_USEC;
+	return j;
+}
+
+static inline uint64_t env_ticks_to_usecs(uint64_t j)
+{
+	return j / 1000UL;
+}
+
+static inline uint64_t env_ticks_to_msecs(uint64_t j)
+{
+	return j / 1000000UL;
+}
+
+static inline uint64_t env_ticks_to_secs(uint64_t j)
+{
+	return j / 1000000000UL;
+}
+
+static inline uint64_t env_secs_to_ticks(uint64_t j)
+{
+	return j * 1000000000UL;
 }
 
 static inline bool env_time_after(uint64_t a, uint64_t b)
@@ -557,14 +574,9 @@ static inline bool env_time_after(uint64_t a, uint64_t b)
 	return time_after64(a,b);
 }
 
-static inline uint64_t env_ticks_to_secs(uint64_t j)
+static inline void env_msleep(uint64_t n)
 {
-	return j >> SHIFT_HZ;
-}
-
-static inline uint64_t env_secs_to_ticks(uint64_t j)
-{
-	return j << SHIFT_HZ;
+	msleep(n);
 }
 
 /* *** BIT OPERATIONS *** */
@@ -584,11 +596,6 @@ static inline int env_bit_test(int nr, const void *addr)
 	return test_bit(nr, addr);
 }
 
-static inline void env_msleep(uint64_t n)
-{
-	msleep(n);
-}
-
 /* *** STRING OPERATIONS *** */