include/asm/pil.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _SPARC64_PIL_H
0003 #define _SPARC64_PIL_H
0004
0005 /* To avoid some locking problems, we hard allocate certain PILs
0006  * for SMP cross call messages that must do a etrap/rtrap.
0007  *
0008  * A local_irq_disable() does not block the cross call delivery, so
0009  * when SMP locking is an issue we reschedule the event into a PIL
0010  * interrupt which is blocked by local_irq_disable().
0011  *
0012  * In fact any XCALL which has to etrap/rtrap has a problem because
0013  * it is difficult to prevent rtrap from running BH's, and that would
0014  * need to be done if the XCALL arrived while %pil==PIL_NORMAL_MAX.
0015  *
0016  * Finally, in order to handle profiling events even when a
0017  * local_irq_disable() is in progress, we only disable up to level 14
0018  * interrupts.  Profile counter overflow interrupts arrive at level
0019  * 15.
0020  */
0021 #define PIL_SMP_CALL_FUNC   1
0022 #define PIL_SMP_RECEIVE_SIGNAL  2
0023 #define PIL_SMP_CAPTURE     3
0024 #define PIL_DEVICE_IRQ      5
0025 #define PIL_SMP_CALL_FUNC_SNGL  6
0026 #define PIL_DEFERRED_PCR_WORK   7
0027 #define PIL_KGDB_CAPTURE    8
0028 #define PIL_NORMAL_MAX      14
0029 #define PIL_NMI         15
0030
0031 #endif /* !(_SPARC64_PIL_H) */