[XTF,benchmark,v1,2/4] time: add stubs

Commit Message

Norbert Manthey March 23, 2020, 1:36 p.m. UTC

To measure how long a certain interaction takes, we need time
primitives. This commit introduces these primitives, so that
future tests can use the gettimeofday function to retrieve the
current time.

Signed-off-by: Paul Semel <[e-mail]>
Signed-off-by: Norbert Manthey <[e-mail]>

---
 build/files.mk     |   1 +
 common/time.c      | 203 +++++++++++++++++++++++++++++++++++++++++++++
 include/xtf/time.h |  66 +++++++++++++++
 3 files changed, 270 insertions(+)
 create mode 100644 common/time.c
 create mode 100644 include/xtf/time.h

Patch

diff --git a/build/files.mk b/build/files.mk
--- a/build/files.mk
+++ b/build/files.mk
@@ -16,6 +16,7 @@  obj-perarch += $(ROOT)/common/libc/vsnprintf.o
 obj-perarch += $(ROOT)/common/report.o
 obj-perarch += $(ROOT)/common/setup.o
 obj-perarch += $(ROOT)/common/xenbus.o
+obj-perarch += $(ROOT)/common/time.o
 
 obj-perenv += $(ROOT)/arch/x86/decode.o
 obj-perenv += $(ROOT)/arch/x86/desc.o
diff --git a/common/time.c b/common/time.c
new file mode 100644
--- /dev/null
+++ b/common/time.c
@@ -0,0 +1,203 @@ 
+#include <xtf/types.h>
+#include <xtf/traps.h>
+#include <xtf/time.h>
+#include <xtf/atomic.h>
+
+/* This function was taken from mini-os source code [tag xen-RELEASE-4.11.1]
+ ****************************************************************************
+ * (C) 2003 - Rolf Neugebauer - Intel Research Cambridge
+ * (C) 2002-2003 - Keir Fraser - University of Cambridge
+ * (C) 2005 - Grzegorz Milos - Intel Research Cambridge
+ * (C) 2006 - Robert Kaiser - FH Wiesbaden
+ ****************************************************************************
+ *
+ *        File: time.c
+ *      Author: Rolf Neugebauer and Keir Fraser
+ *     Changes: Grzegorz Milos
+ *
+ * Description: Simple time and timer functions
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+/* It returns ((delta << shift) * mul_frac) >> 32 */
+static inline uint64_t scale_delta(uint64_t delta, uint32_t mul_frac, int shift)
+{
+    uint64_t product;
+#ifdef __i386__
+    uint32_t tmp1, tmp2;
+#endif
+
+    if ( shift < 0 )
+        delta >>= -shift;
+    else
+        delta <<= shift;
+
+#ifdef __i386__
+    __asm__ (
+            "mul  %5       ; "
+            "mov  %4,%%eax ; "
+            "mov  %%edx,%4 ; "
+            "mul  %5       ; "
+            "add  %4,%%eax ; "
+            "xor  %5,%5    ; "
+            "adc  %5,%%edx ; "
+            : "=A" (product), "=r" (tmp1), "=r" (tmp2)
+            : "a" ((uint32_t)delta), "1" ((uint32_t)(delta >> 32)), "2" (mul_frac) );
+#else
+    __asm__ (
+            "mul %%rdx ; shrd $32,%%rdx,%%rax"
+            : "=a" (product) : "0" (delta), "d" ((uint64_t)mul_frac) );
+#endif
+
+    return product;
+}
+
+
+#if defined(__i386__)
+uint32_t since_boot_time(void)
+#else
+uint64_t since_boot_time(void)
+#endif
+{
+    unsigned long old_tsc, tsc;
+#if defined(__i386__)
+    uint32_t system_time;
+#else
+    uint64_t system_time;
+#endif
+    uint32_t ver1, ver2;
+
+    do {
+        do {
+            ver1 = shared_info.vcpu_info[0].time.version;
+            smp_rmb();
+        } while ( (ver1 & 1) == 1 );
+
+        system_time = shared_info.vcpu_info[0].time.system_time;
+        old_tsc = shared_info.vcpu_info[0].time.tsc_timestamp;
+        smp_rmb();
+        tsc = rdtscp();
+        ver2 = ACCESS_ONCE(shared_info.vcpu_info[0].time.version);
+        smp_rmb();
+    } while ( ver1 != ver2 );
+
+    system_time += scale_delta(tsc - old_tsc,
+                               shared_info.vcpu_info[0].time.tsc_to_system_mul,
+                               shared_info.vcpu_info[0].time.tsc_shift);
+
+    return system_time;
+}
+
+/* This function return the epoch time (number of seconds elapsed
+ * since Juanary 1, 1970) */
+#if defined(__i386__)
+uint32_t current_time(void)
+#else
+uint64_t current_time(void)
+#endif
+{
+#if defined(__i386__)
+    uint32_t seconds = shared_info.wc_sec;
+#else
+    uint64_t seconds = ((uint64_t)shared_info.wc_sec_hi << 32) | shared_info.wc_sec;
+#endif
+    return seconds + (since_boot_time() / 1000000000);
+}
+
+/* The POSIX gettimeofday syscall normally takes a second argument, which is
+ * the timezone (struct timezone). However, it sould be NULL because linux
+ * doesn't use it anymore. So we need for us to add it in this function
+ */
+int gettimeofday(struct timeval *tp)
+{
+    if (!tp)
+        return -1;
+
+    tp->sec = current_time();
+    tp->nsec = shared_info.wc_nsec + (since_boot_time() % 1000000000);
+    return 0;
+}
+
+#if defined(__i386__)
+static inline void nspin_sleep(uint32_t t)
+#else
+static inline void nspin_sleep(uint64_t t)
+#endif
+{
+    unsigned long end = since_boot_time() + t;
+
+    while ( since_boot_time() < end )
+        asm volatile ( "pause" );
+}
+
+#if defined(__i386__)
+static inline void spin_sleep(uint32_t t)
+#else
+static inline void spin_sleep(uint64_t t)
+#endif
+{
+#if defined(__i386__)
+    uint32_t nsec = t * 1000000000;
+#else
+    uint64_t nsec = t * 1000000000ul;
+#endif
+    nspin_sleep(nsec);
+}
+
+#if defined(__i386__)
+static inline void mspin_sleep(uint32_t t)
+#else
+static inline void mspin_sleep(uint64_t t)
+#endif
+{
+#if defined(__i386__)
+    uint32_t nsec = t * 1000000;
+#else
+    uint64_t nsec = t * 1000000ul;
+#endif
+    nspin_sleep(nsec);
+}
+
+#if defined(__i386__)
+void sleep(uint32_t t)
+#else
+void sleep(uint64_t t)
+#endif
+{
+    spin_sleep(t);
+}
+
+#if defined(__i386__)
+void msleep(uint32_t t)
+#else
+void msleep(uint64_t t)
+#endif
+{
+    mspin_sleep(t);
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/include/xtf/time.h b/include/xtf/time.h
new file mode 100644
--- /dev/null
+++ b/include/xtf/time.h
@@ -0,0 +1,66 @@ 
+/**
+ * @file include/xtf/time.h
+ *
+ * Time management
+ */
+#ifndef XTF_TIME_H
+# define XTF_TIME_H
+
+#include <xtf/types.h>
+
+static inline uint64_t rdtscp (void) {
+  unsigned int low, high;
+  asm volatile ("rdtscp" : "=a" (low), "=d" (high) :: "ecx");
+  return ((uint64_t) high << 32) | low;
+}
+
+struct timeval {
+#if !defined(__i386__)
+    uint64_t sec;
+    uint64_t nsec;
+#else
+    uint32_t sec;
+    uint32_t nsec;
+#endif
+};
+
+#if defined(__i386__)
+/* Time from boot in nanoseconds */
+uint32_t since_boot_time(void);
+
+uint32_t current_time(void);
+
+/* This function takes seconds in parameter */
+void sleep(uint32_t f);
+
+/* Be careful, this function takes milliseconds in parameter,
+ * not microseconds !
+ */
+void msleep(uint32_t f);
+#else
+uint64_t since_boot_time(void);
+
+uint64_t current_time(void);
+
+void sleep(uint64_t f);
+
+void msleep(uint64_t f);
+#endif
+
+int gettimeofday(struct timeval *tp);
+
+
+/* This returns the current epoch time */
+#define NOW() current_time()
+
+#endif /* XTF_TIME_H */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */