Comment 13 for bug 214442

When I'm running some game (in this case Paintball2 (it is 3D
FirstPersonShooter based on Quake2 engine)) and go to some very "hard-
renderable" (there is very low fps) place (in that game), it quits with error
"Error: Rage 128 timed out... exiting".
I found out that this error is in r128_ioctl.c file in function:
void r128WaitForIdleLocked( r128ContextPtr rmesa )
So i did some changes to see what is wrong and edited code a little:

do {
  i = 0;
  do {
    ret = drmCommandNone( fd, DRM_R128_CCE_IDLE );
+ fprintf( stderr, "ret=%d, i=%d, to=%d\n" , ret, i, to);
+ if (ret) DO_USLEEP( 100 );
- } while ( ret && errno == EBUSY && i++ < R128_IDLE_RETRY );
+ } while ( ret && i++ < R128_IDLE_RETRY );
} while ( ( ret == -EBUSY ) && ( to++ < R128_TIMEOUT ) );

if ( ret < 0 ) {
+ fprintf( stderr, "(ret=%d, i=%d, to=%d, errno=%d)\n" , ret, i, to, errno);
  drmCommandNone( fd, DRM_R128_CCE_RESET);

And when I run the game and go around the level looking on the wall everything
if OK, it prints out:

    ret=0, i=0, to=0

(with every frame, I think)
So IDLE call is successful instantly (in the first iteration).

But when I look's on some "hard-to-render" place (many polygons or something),
game hangs and it prints out:

ret=-22, i=0, to=0
ret=-22, i=1, to=0
ret=-22, i=2, to=0
...
ret=-22, i=32, to=0
(ret=-22, i=33, to=0, errno=22)
Error: Rage 128 timed out... exiting

Is seems that something causes the IDLE call can't be done successful, anymore.
Also I tried to add line with DO_USLEEP(500000), but it didn't help.
Error number 22 is EINVAL (invalid argument) and is thrown when ioctl's
"request" or "argp" arguments are not valid.
It should throw error 16 (busy) at most...
I'm not so expert in Mesa's DRI and DRM code to find the problem.
(ps. this problem I had with some other games and with Blender(3d modeling).
and some games eg. Quake3Arena doesn't do this problem...
maybe it occurs only when rendered scene is very very full of polygons...
win32 version of Paintball2 doesn't hangs in this scenes but have big spf
(seconds per frame))

Thank your for helping.