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authorPeter Hutterer <peter.hutterer@who-t.net>2012-03-05 14:12:52 +1000
committerPeter Hutterer <peter.hutterer@who-t.net>2012-03-22 11:33:42 +1000
commitc0b0a9bce9237b0abe150c1a7b54939affecc751 (patch)
treeb14f1d504c2e362c124a2e20a6d48eaec124a088 /dix/Xserver.d
parentab3a815a75ab5695753fa37a98b0ea5293d4cb91 (diff)
dix: add dtrace probes to input API
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>
Diffstat (limited to 'dix/Xserver.d')
-rw-r--r--dix/Xserver.d2
1 files changed, 2 insertions, 0 deletions
diff --git a/dix/Xserver.d b/dix/Xserver.d
index 2ad337351..248d48e24 100644
--- a/dix/Xserver.d
+++ b/dix/Xserver.d
@@ -48,6 +48,8 @@ provider Xserver {
probe resource__free(uint32_t, uint32_t, void *, string);
/* client id, event type, event* */
probe send__event(int, uint8_t, void *);
+ /* deviceid, type, button/keycode/touchid, flags, nvalues, mask, values */
+ probe input__event(int, int, uint32_t, uint32_t, int8_t, uint8_t*, double*);
};
#pragma D attributes Unstable/Unstable/Common provider Xserver provider