drm/lima: Expose job_hang_limit module parameter

Some pp or gp jobs can be successfully repeated even after they time outs.
Introduce lima module parameter to specify number of times a job can hang
before being dropped.

Signed-off-by: Andrey Lebedev <[e-mail]>
Signed-off-by: Qiang Yu <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/lima/lima_drv.c

···
 int lima_sched_timeout_ms;
 uint lima_heap_init_nr_pages = 8;
 uint lima_max_error_tasks;
+uint lima_job_hang_limit;
 
 MODULE_PARM_DESC(sched_timeout_ms, "task run timeout in ms");
 module_param_named(sched_timeout_ms, lima_sched_timeout_ms, int, 0444);
···
 
 MODULE_PARM_DESC(max_error_tasks, "max number of error tasks to save");
 module_param_named(max_error_tasks, lima_max_error_tasks, uint, 0644);
+
+MODULE_PARM_DESC(job_hang_limit, "number of times to allow a job to hang before dropping it (default 0)");
+module_param_named(job_hang_limit, lima_job_hang_limit, uint, 0444);
 
 static int lima_ioctl_get_param(struct drm_device *dev, void *data, struct drm_file *file)
 {

drivers/gpu/drm/lima/lima_drv.h

···
 extern int lima_sched_timeout_ms;
 extern uint lima_heap_init_nr_pages;
 extern uint lima_max_error_tasks;
+extern uint lima_job_hang_limit;
 
 struct lima_vm;
 struct lima_bo;

drivers/gpu/drm/lima/lima_sched.c

···
 
 	INIT_WORK(&pipe->recover_work, lima_sched_recover_work);
 
-	return drm_sched_init(&pipe->base, &lima_sched_ops, 1, 0,
-			      msecs_to_jiffies(timeout), name);
+	return drm_sched_init(&pipe->base, &lima_sched_ops, 1,
+			      lima_job_hang_limit, msecs_to_jiffies(timeout),
+			      name);
 }
 
 void lima_sched_pipe_fini(struct lima_sched_pipe *pipe)