arch/sparc/include/asm/pil.h

   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) */