tools lib traceevent: Add xen plugin

Adding xen plugin.

This plugin adds fields resolving for following tracepoint events:

  xen:xen_mc_entry
  xen:xen_mc_extend_args

The diff of 'perf script' output generated by old and new code: (data
was generated by 'perf record -e 'xen:*' ls')

  --- script.xen.old
  +++ script.xen.new
  -         swapper     0 [002]   136.267492: xen:xen_mc_entry: [FAILED TO PARSE] op=3 nargs=2 args=ARRAY[18, 00, 00, 00, 00, 00, 00, 00, 00, e0, d4, 4b, 04, 88, ff, ff, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00]
  +         swapper     0 [002]   136.267492: xen:xen_mc_entry: op 3(stack_switch) args [18, 0, 0, 0, 0, 0]
  -            perf  1970 [008]   136.273319: xen:xen_mc_extend_args: [FAILED TO PARSE] op=1 args=16 res=1
  +            perf  1970 [008]   136.273319: xen:xen_mc_extend_args: extending op 1(mmu_update) by 16 bytes res ???

NOTE We still do not handle the 'sizeof' and fail to parse following xen
tracepoints:

  xen:xen_mmu_set_pte
  xen:xen_mmu_set_pte_atomic
  xen:xen_mmu_set_domain_pte
  xen:xen_mmu_set_pte_at
  xen:xen_mmu_set_pmd
  xen:xen_mmu_set_pud
  xen:xen_mmu_set_pgd
  xen:xen_mmu_ptep_modify_prot_start
  xen:xen_mmu_ptep_modify_prot_commit

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1386076182-14484-20-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 130 insertions, 0 deletions

diff --git a/tools/lib/traceevent/plugin_xen.c b/tools/lib/traceevent/plugin_xen.c
new file mode 100644
index 000000000000..e7794298f3a9
--- /dev/null
+++ b/tools/lib/traceevent/plugin_xen.c
@@ -0,0 +1,130 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "event-parse.h"
+
+#define __HYPERVISOR_set_trap_table                     0
+#define __HYPERVISOR_mmu_update                         1
+#define __HYPERVISOR_set_gdt                            2
+#define __HYPERVISOR_stack_switch                       3
+#define __HYPERVISOR_set_callbacks                      4
+#define __HYPERVISOR_fpu_taskswitch                     5
+#define __HYPERVISOR_sched_op_compat                    6
+#define __HYPERVISOR_dom0_op                            7
+#define __HYPERVISOR_set_debugreg                       8
+#define __HYPERVISOR_get_debugreg                       9
+#define __HYPERVISOR_update_descriptor                  10
+#define __HYPERVISOR_memory_op                          12
+#define __HYPERVISOR_multicall                          13
+#define __HYPERVISOR_update_va_mapping                  14
+#define __HYPERVISOR_set_timer_op                       15
+#define __HYPERVISOR_event_channel_op_compat            16
+#define __HYPERVISOR_xen_version                        17
+#define __HYPERVISOR_console_io                         18
+#define __HYPERVISOR_physdev_op_compat                  19
+#define __HYPERVISOR_grant_table_op                     20
+#define __HYPERVISOR_vm_assist                          21
+#define __HYPERVISOR_update_va_mapping_otherdomain      22
+#define __HYPERVISOR_iret                               23 /* x86 only */
+#define __HYPERVISOR_vcpu_op                            24
+#define __HYPERVISOR_set_segment_base                   25 /* x86/64 only */
+#define __HYPERVISOR_mmuext_op                          26
+#define __HYPERVISOR_acm_op                             27
+#define __HYPERVISOR_nmi_op                             28
+#define __HYPERVISOR_sched_op                           29
+#define __HYPERVISOR_callback_op                        30
+#define __HYPERVISOR_xenoprof_op                        31
+#define __HYPERVISOR_event_channel_op                   32
+#define __HYPERVISOR_physdev_op                         33
+#define __HYPERVISOR_hvm_op                             34
+#define __HYPERVISOR_tmem_op                            38
+
+/* Architecture-specific hypercall definitions. */
+#define __HYPERVISOR_arch_0                             48
+#define __HYPERVISOR_arch_1                             49
+#define __HYPERVISOR_arch_2                             50
+#define __HYPERVISOR_arch_3                             51
+#define __HYPERVISOR_arch_4                             52
+#define __HYPERVISOR_arch_5                             53
+#define __HYPERVISOR_arch_6                             54
+#define __HYPERVISOR_arch_7                             55
+
+#define N(x)    [__HYPERVISOR_##x] = "("#x")"
+static const char *xen_hypercall_names[] = {
+        N(set_trap_table),
+        N(mmu_update),
+        N(set_gdt),
+        N(stack_switch),
+        N(set_callbacks),
+        N(fpu_taskswitch),
+        N(sched_op_compat),
+        N(dom0_op),
+        N(set_debugreg),
+        N(get_debugreg),
+        N(update_descriptor),
+        N(memory_op),
+        N(multicall),
+        N(update_va_mapping),
+        N(set_timer_op),
+        N(event_channel_op_compat),
+        N(xen_version),
+        N(console_io),
+        N(physdev_op_compat),
+        N(grant_table_op),
+        N(vm_assist),
+        N(update_va_mapping_otherdomain),
+        N(iret),
+        N(vcpu_op),
+        N(set_segment_base),
+        N(mmuext_op),
+        N(acm_op),
+        N(nmi_op),
+        N(sched_op),
+        N(callback_op),
+        N(xenoprof_op),
+        N(event_channel_op),
+        N(physdev_op),
+        N(hvm_op),
+
+/* Architecture-specific hypercall definitions. */
+        N(arch_0),
+        N(arch_1),
+        N(arch_2),
+        N(arch_3),
+        N(arch_4),
+        N(arch_5),
+        N(arch_6),
+        N(arch_7),
+};
+#undef N
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+static const char *xen_hypercall_name(unsigned op)
+{
+        if (op < ARRAY_SIZE(xen_hypercall_names) &&
+            xen_hypercall_names[op] != NULL)
+                return xen_hypercall_names[op];
+
+        return "";
+}
+
+unsigned long long process_xen_hypercall_name(struct trace_seq *s,
+                                              unsigned long long *args)
+{
+        unsigned int op = args[0];
+
+        trace_seq_printf(s, "%s", xen_hypercall_name(op));
+        return 0;
+}
+
+int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
+{
+        pevent_register_print_function(pevent,
+                                       process_xen_hypercall_name,
+                                       PEVENT_FUNC_ARG_STRING,
+                                       "xen_hypercall_name",
+                                       PEVENT_FUNC_ARG_INT,
+                                       PEVENT_FUNC_ARG_VOID);
+        return 0;
+}