[PATCH v4 10/10] tracing/hyper-v: trace hyperv_mmu_flush_tlb_others()

Vitaly Kuznetsov
2017-05-24T12:05:30Z

Add Hyper-V tracing subsystem and trace hyperv_mmu_flush_tlb_others().
Tracing is done the same way we do xen_mmu_flush_tlb_others().

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
Tested-by: Simon Xiao <sixiao@microsoft.com>
Tested-by: Srikanth Myakam <v-srm@microsoft.com>
---
MAINTAINERS | 1 +
arch/x86/hyperv/mmu.c | 8 ++++++++
arch/x86/include/asm/trace/hyperv.h | 34 ++++++++++++++++++++++++++++++++++
3 files changed, 43 insertions(+)
create mode 100644 arch/x86/include/asm/trace/hyperv.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 9e98464..045e10a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6168,6 +6168,7 @@ M: Stephen Hemminger <sthemmin@microsoft.com>
L: devel@linuxdriverproject.org
S: Maintained
F: arch/x86/include/asm/mshyperv.h
+F: arch/x86/include/asm/trace/hyperv.h
F: arch/x86/include/uapi/asm/hyperv.h
F: arch/x86/kernel/cpu/mshyperv.c
F: arch/x86/hyperv
diff --git a/arch/x86/hyperv/mmu.c b/arch/x86/hyperv/mmu.c
index c9cecb3..f6b5211 100644
--- a/arch/x86/hyperv/mmu.c
+++ b/arch/x86/hyperv/mmu.c
@@ -6,6 +6,10 @@
#include <asm/tlbflush.h>
#include <asm/msr.h>
#include <asm/fpu/api.h>
+#include <asm/trace/hyperv.h>
+
+#define CREATE_TRACE_POINTS
+DEFINE_TRACE(hyperv_mmu_flush_tlb_others);

/* HvFlushVirtualAddressSpace, HvFlushVirtualAddressList hypercalls */
struct hv_flush_pcpu {
@@ -75,6 +79,8 @@ static void hyperv_flush_tlb_others(const struct cpumask *cpus,
u64 status = -1ULL;
int cpu, vcpu, gva_n, max_gvas;

+ trace_hyperv_mmu_flush_tlb_others(cpus, mm, start, end);
+
if (!pcpu_flush || !hv_hypercall_pg)
goto do_native;

@@ -161,6 +167,8 @@ static void hyperv_flush_tlb_others_ex(const struct cpumask *cpus,
u64 status = -1ULL;
int nr_bank = 0, max_gvas, gva_n;

+ trace_hyperv_mmu_flush_tlb_others(cpus, mm, start, end);
+
if (!pcpu_flush_ex || !hv_hypercall_pg)
goto do_native;

diff --git a/arch/x86/include/asm/trace/hyperv.h b/arch/x86/include/asm/trace/hyperv.h
new file mode 100644
index 0000000..e46a351
--- /dev/null
+++ b/arch/x86/include/asm/trace/hyperv.h
@@ -0,0 +1,34 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM hyperv
+
+#if !defined(_TRACE_HYPERV_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_HYPERV_H
+
+#include <linux/tracepoint.h>
+
+#if IS_ENABLED(CONFIG_HYPERV)
+
+TRACE_EVENT(hyperv_mmu_flush_tlb_others,
+ TP_PROTO(const struct cpumask *cpus, struct mm_struct *mm,
+ unsigned long addr, unsigned long end),
+ TP_ARGS(cpus, mm, addr, end),
+ TP_STRUCT__entry(
+ __field(unsigned int, ncpus)
+ __field(struct mm_struct *, mm)
+ __field(unsigned long, addr)
+ __field(unsigned long, end)
+ ),
+ TP_fast_assign(__entry->ncpus = cpumask_weight(cpus);
+ __entry->mm = mm;
+ __entry->addr = addr,
+ __entry->end = end),
+ TP_printk("ncpus %d mm %p addr %lx, end %lx",
+ __entry->ncpus, __entry->mm, __entry->addr, __entry->end)
+ );
+
+#endif /* CONFIG_HYPERV */
+
+#endif /* _TRACE_HYPERV_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
--
2.9.4