21  * The maximum FIFO size for fault window can be 8MB
23  * instance will be having fault window.
62 static void update_csb(struct vas_window *window,  in update_csb()  argument
76 	if (WARN_ON_ONCE(!window->mm || !window->user_win))  in update_csb()
95 	pid = window->pid;  in update_csb()
98 	 * Process closes send window after all pending NX requests are  in update_csb()
100 	 * open a window and can exit without closing it. May be some  in update_csb()
101 	 * requests are pending or this window can be used by other  in update_csb()
105 	 * invalid, send SEGV signal to pid saved in window. If the  in update_csb()
107 	 * Parent thread (tgid) will close this window upon its exit.  in update_csb()
109 	 * pid and mm references are taken when window is opened by  in update_csb()
111 	 * a window and exits without closing it.  in update_csb()
114 		pid = window->tgid;  in update_csb()
117 		 * Parent thread (tgid) will be closing window when it  in update_csb()
130 	kthread_use_mm(window->mm);  in update_csb()
142 	kthread_unuse_mm(window->mm);  in update_csb()
195  * It takes credit on fault window, updates nx_fault_stamp in CRB with
198  * pswid - window ID of the window on which the request is sent.
205  * available on fault window. Otherwise, returns with RMA_reject.
207  * Total credits available on fault window: FIFO_SIZE(4MB)/CRBS_SIZE(128)
215 	struct vas_window *window;  in vas_fault_thread_fn()  local
228 	 * pswid	NX assigns window ID. Set pswid to -1 after  in vas_fault_thread_fn()
267 		 * Return credit for the fault window.  in vas_fault_thread_fn()
276 		window = vas_pswid_to_window(vinst,  in vas_fault_thread_fn()
279 		if (IS_ERR(window)) {  in vas_fault_thread_fn()
282 			 * window but we can't find that window and we can't  in vas_fault_thread_fn()
284 			 * window).  in vas_fault_thread_fn()
296 			update_csb(window, crb);  in vas_fault_thread_fn()
298 			 * Return credit for send window after processing  in vas_fault_thread_fn()
301 			vas_return_credit(window, true);  in vas_fault_thread_fn()
333  * Fault window is opened per VAS instance. NX pastes fault CRB in fault