--- /dev/null
+commit 458c2022e992c057bd21d02e4c77bcc7d4d6cd6c
+Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+Date: Thu Aug 21 11:15:50 2014 -0400
+
+ Update kvm instrumentation: compile on 3.17-rc1
+
+ Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+
+diff --git a/instrumentation/events/lttng-module/arch/x86/kvm/trace.h b/instrumentation/events/lttng-module/arch/x86/kvm/trace.h
+index 2354884..3c299c5 100644
+--- a/instrumentation/events/lttng-module/arch/x86/kvm/trace.h
++++ b/instrumentation/events/lttng-module/arch/x86/kvm/trace.h
+@@ -724,7 +724,7 @@ TRACE_EVENT(kvm_emulate_insn,
+ tp_memcpy(insn,
+ vcpu->arch.emulate_ctxt.decode.fetch.data,
+ 15)
+-#else
++#elif (LINUX_VERSION_CODE < KERNEL_VERSION(3,17,0))
+ tp_assign(rip, vcpu->arch.emulate_ctxt.fetch.start)
+ tp_assign(csbase, kvm_x86_ops->get_segment_base(vcpu, VCPU_SREG_CS))
+ tp_assign(len, vcpu->arch.emulate_ctxt._eip
+@@ -732,6 +732,16 @@ TRACE_EVENT(kvm_emulate_insn,
+ tp_memcpy(insn,
+ vcpu->arch.emulate_ctxt.fetch.data,
+ 15)
++#else
++ tp_assign(rip, vcpu->arch.emulate_ctxt._eip -
++ (vcpu->arch.emulate_ctxt.fetch.ptr -
++ vcpu->arch.emulate_ctxt.fetch.data))
++ tp_assign(csbase, kvm_x86_ops->get_segment_base(vcpu, VCPU_SREG_CS))
++ tp_assign(len, vcpu->arch.emulate_ctxt.fetch.ptr -
++ vcpu->arch.emulate_ctxt.fetch.data)
++ tp_memcpy(insn,
++ vcpu->arch.emulate_ctxt.fetch.data,
++ 15)
+ #endif
+ tp_assign(flags, kei_decode_mode(vcpu->arch.emulate_ctxt.mode))
+ tp_assign(failed, failed)
+commit b07252070edd244987bf160c1ee488d4796bb3a3
+Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+Date: Sun Jul 13 13:20:57 2014 -0400
+
+ Use 3.17 ktime_get_mono_fast_ns() new API
+
+ The new ktime_get_mono_fast_ns() API introduced in kernel 3.17 allows
+ tracing NMI handlers.
+
+ Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ Cc: Thomas Gleixner <tglx@linutronix.de>
+
+diff --git a/Makefile b/Makefile
+index aa4835d..eeffdfe 100644
+--- a/Makefile
++++ b/Makefile
+@@ -35,7 +35,7 @@ lttng-tracer-objs := lttng-events.o lttng-abi.o \
+ lttng-context-vtid.o lttng-context-ppid.o \
+ lttng-context-vppid.o lttng-calibrate.o \
+ lttng-context-hostname.o wrapper/random.o \
+- probes/lttng.o
++ probes/lttng.o wrapper/trace-clock.o
+
+ obj-m += lttng-statedump.o
+ lttng-statedump-objs := lttng-statedump-impl.o wrapper/irqdesc.o \
+diff --git a/wrapper/trace-clock.c b/wrapper/trace-clock.c
+new file mode 100644
+index 0000000..1b7a217
+--- /dev/null
++++ b/wrapper/trace-clock.c
+@@ -0,0 +1,29 @@
++/*
++ * wrapper/trace-clock.c
++ *
++ * Contains LTTng trace clock mapping to LTTng trace clock or mainline monotonic
++ * clock. This wrapper depends on CONFIG_HIGH_RES_TIMERS=y.
++ *
++ * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
++ *
++ * This library is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU Lesser General Public
++ * License as published by the Free Software Foundation; only
++ * version 2.1 of the License.
++ *
++ * This library is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ * Lesser General Public License for more details.
++ *
++ * You should have received a copy of the GNU Lesser General Public
++ * License along with this library; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
++ */
++
++#include "trace-clock.h"
++
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0))
++DEFINE_PER_CPU(local_t, lttng_last_tsc);
++EXPORT_PER_CPU_SYMBOL(lttng_last_tsc);
++#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)) */
+diff --git a/wrapper/trace-clock.h b/wrapper/trace-clock.h
+index 9c0c806..b145b82 100644
+--- a/wrapper/trace-clock.h
++++ b/wrapper/trace-clock.h
+@@ -32,7 +32,9 @@
+ #include <linux/ktime.h>
+ #include <linux/time.h>
+ #include <linux/hrtimer.h>
++#include <linux/percpu.h>
+ #include <linux/version.h>
++#include <asm/local.h>
+ #include "../lttng-kernel-version.h"
+ #include "random.h"
+
+@@ -40,6 +42,88 @@
+ #error "Linux kernels 3.10 and 3.11 introduce a deadlock in the timekeeping subsystem. Fixed by commit 7bd36014460f793c19e7d6c94dab67b0afcfcb7f \"timekeeping: Fix HRTICK related deadlock from ntp lock changes\" in Linux."
+ #endif
+
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0))
++
++DECLARE_PER_CPU(local_t, lttng_last_tsc);
++
++#if (BITS_PER_LONG == 32)
++/*
++ * Fixup "src_now" using the 32 LSB from "last". We need to handle overflow and
++ * underflow of the 32nd bit. "last" can be above, below or equal to the 32 LSB
++ * of "src_now".
++ */
++static inline u64 trace_clock_fixup(u64 src_now, u32 last)
++{
++ u64 now;
++
++ now = src_now & 0xFFFFFFFF00000000ULL;
++ now |= (u64) last;
++ /* Detect overflow or underflow between now and last. */
++ if ((src_now & 0x80000000U) && !(last & 0x80000000U)) {
++ /*
++ * If 32nd bit transitions from 1 to 0, and we move forward in
++ * time from "now" to "last", then we have an overflow.
++ */
++ if (((s32) now - (s32) last) < 0)
++ now += 0x0000000100000000ULL;
++ } else if (!(src_now & 0x80000000U) && (last & 0x80000000U)) {
++ /*
++ * If 32nd bit transitions from 0 to 1, and we move backward in
++ * time from "now" to "last", then we have an underflow.
++ */
++ if (((s32) now - (s32) last) > 0)
++ now -= 0x0000000100000000ULL;
++ }
++ return now;
++}
++#else /* #if (BITS_PER_LONG == 32) */
++/*
++ * The fixup is pretty easy on 64-bit architectures: "last" is a 64-bit
++ * value, so we can use last directly as current time.
++ */
++static inline u64 trace_clock_fixup(u64 src_now, u64 last)
++{
++ return last;
++}
++#endif /* #else #if (BITS_PER_LONG == 32) */
++
++/*
++ * Always called with preemption disabled. Can be interrupted.
++ */
++static inline u64 trace_clock_monotonic_wrapper(void)
++{
++ u64 now;
++ unsigned long last, result;
++ local_t *last_tsc;
++
++ /* Use fast nmi-safe monotonic clock provided by the Linux kernel. */
++ last_tsc = &__get_cpu_var(lttng_last_tsc);
++ last = local_read(last_tsc);
++ /*
++ * Read "last" before "now". It is not strictly required, but it ensures
++ * that an interrupt coming in won't artificially trigger a case where
++ * "now" < "last". This kind of situation should only happen if the
++ * mono_fast time source goes slightly backwards.
++ */
++ barrier();
++ now = ktime_get_mono_fast_ns();
++ if (((long) now - (long) last) < 0)
++ now = trace_clock_fixup(now, last);
++ result = local_cmpxchg(last_tsc, last, (unsigned long) now);
++ if (result == last) {
++ /* Update done. */
++ return now;
++ } else {
++ /*
++ * Update not done, due to concurrent update. We can use
++ * "result", since it has been sampled concurrently with our
++ * time read, so it should not be far from "now".
++ */
++ return trace_clock_fixup(now, result);
++ }
++}
++
++#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)) */
+ static inline u64 trace_clock_monotonic_wrapper(void)
+ {
+ ktime_t ktime;
+@@ -54,6 +138,7 @@ static inline u64 trace_clock_monotonic_wrapper(void)
+ ktime = ktime_get();
+ return ktime_to_ns(ktime);
+ }
++#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)) */
+
+ static inline u32 trace_clock_read32(void)
+ {
+@@ -75,23 +160,19 @@ static inline int trace_clock_uuid(char *uuid)
+ return wrapper_get_bootid(uuid);
+ }
+
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0))
+ static inline int get_trace_clock(void)
+ {
+- /*
+- * LTTng: Using mainline kernel monotonic clock. NMIs will not be
+- * traced, and expect significant performance degradation compared to
+- * the LTTng trace clocks. Integration of the LTTng 0.x trace clocks
+- * into LTTng 2.0 is planned in a near future.
+- */
+- printk(KERN_WARNING "LTTng: Using mainline kernel monotonic clock.\n");
+- printk(KERN_WARNING " * NMIs will not be traced,\n");
+- printk(KERN_WARNING " * expect significant performance degradation compared to the\n");
+- printk(KERN_WARNING " LTTng trace clocks.\n");
+- printk(KERN_WARNING "Integration of the LTTng 0.x trace clocks into LTTng 2.0 is planned\n");
+- printk(KERN_WARNING "in a near future.\n");
+-
++ printk(KERN_WARNING "LTTng: Using mainline kernel monotonic fast clock, which is NMI-safe.\n");
++ return 0;
++}
++#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)) */
++static inline int get_trace_clock(void)
++{
++ printk(KERN_WARNING "LTTng: Using mainline kernel monotonic clock. NMIs will not be traced.\n");
+ return 0;
+ }
++#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)) */
+
+ static inline void put_trace_clock(void)
+ {
projects / packages / lttng-modules.git / commitdiff