xref: /openbmc/linux/arch/sparc/include/asm/pil.h (revision b2441318)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _SPARC64_PIL_H
3 #define _SPARC64_PIL_H
4 
5 /* To avoid some locking problems, we hard allocate certain PILs
6  * for SMP cross call messages that must do a etrap/rtrap.
7  *
8  * A local_irq_disable() does not block the cross call delivery, so
9  * when SMP locking is an issue we reschedule the event into a PIL
10  * interrupt which is blocked by local_irq_disable().
11  *
12  * In fact any XCALL which has to etrap/rtrap has a problem because
13  * it is difficult to prevent rtrap from running BH's, and that would
14  * need to be done if the XCALL arrived while %pil==PIL_NORMAL_MAX.
15  *
16  * Finally, in order to handle profiling events even when a
17  * local_irq_disable() is in progress, we only disable up to level 14
18  * interrupts.  Profile counter overflow interrupts arrive at level
19  * 15.
20  */
21 #define PIL_SMP_CALL_FUNC	1
22 #define PIL_SMP_RECEIVE_SIGNAL	2
23 #define PIL_SMP_CAPTURE		3
24 #define PIL_DEVICE_IRQ		5
25 #define PIL_SMP_CALL_FUNC_SNGL	6
26 #define PIL_DEFERRED_PCR_WORK	7
27 #define PIL_KGDB_CAPTURE	8
28 #define PIL_NORMAL_MAX		14
29 #define PIL_NMI			15
30 
31 #endif /* !(_SPARC64_PIL_H) */
32