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dix: add dtrace probes to input API

Browse source 
For driver debugging, it is helpful to know whether the driver has actually
submitted an event to the server. dtrace hooks can help here.

Note that GetPointerEvents and friends may also be triggered by the server
for other emulated devices, some care must be taken when analysing the
results.

Additional difficulty: proximity events have a run-time assigned type, so
this may make automatic detection a tad harder. If in doubt, go for any
event > 64 since the only two that can have that value are ProximityIn and
ProximityOut.

An example systemtap script is below:

  # Compile+run with
  #       stap -g xorg.stp /usr/bin/Xorg
  #

  function print_valuators:string(nvaluators:long, mask_in:long, valuators_in:long) %{
          int i;
          unsigned char *mask = (unsigned char*)THIS->mask_in;
          double *valuators = (double*)THIS->valuators_in;
          char str[128] = {0};
          char *s = str;

  #define BitIsSet(ptr, bit) (((unsigned char*)(ptr))[(bit)>>3] & (1 << ((bit) & 7)))

          s += sprintf(s, "nval: %d ::", (int)THIS->nvaluators);
          for (i = 0; i < THIS->nvaluators; i++)
          {
                  s += sprintf(s, "	%d: ", i);
                  if (BitIsSet(mask, i))
                      s += sprintf(s, "%d", (int)valuators[i]);
          }

          sprintf(THIS->__retvalue, "%s", str);
  %}

  probe process(@1).mark("input__event")
  {
      deviceid = $arg1
      type = $arg2
      detail = $arg3
      flags = $arg4
      nvaluators = $arg5

      str = print_valuators(nvaluators, $arg6, $arg7)
      printf("Event: device %d type %d detail %d flags %#x %s\n",
              deviceid, type, detail, flags, str);
  }

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Acked-by: Jeremy Huddleston <jeremyhu@apple.com>
This commit is contained in:
Peter Hutterer 2012-03-05 14:12:52 +10:00
commit c0b0a9bce9
4 changed files with 201 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

7
dix/Xserver-dtrace.h.in
View file

@ -54,7 +54,8 @@ extern "C" {
__dtrace_Xserver___resource__free(arg0, arg1, arg2, arg3)
#define XSERVER_SEND_EVENT(arg0, arg1, arg2) \
__dtrace_Xserver___send__event(arg0, arg1, arg2)
#define XSERVER_INPUT_EVENT(arg0, arg1, arg2, arg3, arg4, arg5, arg6) \
__dtrace_Xserver___input__event(arg0, arg1, arg2, arg3, arg4, arg5, arg6)
extern void __dtrace_Xserver___client__auth(int, string, pid_t, zoneid_t);
extern void __dtrace_Xserver___client__connect(int, int);
@ -64,6 +65,8 @@ extern void __dtrace_Xserver___request__start(string, uint8_t, uint16_t, int, vo
extern void __dtrace_Xserver___resource__alloc(uint32_t, uint32_t, void *, string);
extern void __dtrace_Xserver___resource__free(uint32_t, uint32_t, void *, string);
extern void __dtrace_Xserver___send__event(int, uint8_t, void *);
extern void __dtrace_Xserver___input__event(int, uint16_t, uint32_t, uint32_t, int8_t, uint8_t *, double *);
#else
@ -75,6 +78,7 @@ extern void __dtrace_Xserver___send__event(int, uint8_t, void *);
#define XSERVER_RESOURCE_ALLOC(arg0, arg1, arg2, arg3)
#define XSERVER_RESOURCE_FREE(arg0, arg1, arg2, arg3)
#define XSERVER_SEND_EVENT(arg0, arg1, arg2)
#define XSERVER_INPUT_EVENT(arg0, arg1, arg2, arg3, arg4, arg5, arg6)
#endif
@ -86,6 +90,7 @@ extern void __dtrace_Xserver___send__event(int, uint8_t, void *);
#define XSERVER_RESOURCE_ALLOC_ENABLED() (1)
#define XSERVER_RESOURCE_FREE_ENABLED() (1)
#define XSERVER_SEND_EVENT_ENABLED() (1)
#define XSERVER_INPUT_EVENT_ENABLED() (1)
#ifdef __cplusplus
}