| Sam Ravnborg | a00736e | 2008-06-19 20:26:19 +0200 | [diff] [blame] | 1 | #ifndef _SPARC64_PIL_H |
| 2 | #define _SPARC64_PIL_H |
| 3 | |
| 4 | /* To avoid some locking problems, we hard allocate certain PILs |
| 5 | * for SMP cross call messages that must do a etrap/rtrap. |
| 6 | * |
| 7 | * A local_irq_disable() does not block the cross call delivery, so |
| 8 | * when SMP locking is an issue we reschedule the event into a PIL |
| 9 | * interrupt which is blocked by local_irq_disable(). |
| 10 | * |
| 11 | * In fact any XCALL which has to etrap/rtrap has a problem because |
| 12 | * it is difficult to prevent rtrap from running BH's, and that would |
| David S. Miller | b4f4372 | 2008-11-23 21:55:29 -0800 | [diff] [blame] | 13 | * need to be done if the XCALL arrived while %pil==PIL_NORMAL_MAX. |
| 14 | * |
| 15 | * Finally, in order to handle profiling events even when a |
| 16 | * local_irq_disable() is in progress, we only disable up to level 14 |
| 17 | * interrupts. Profile counter overflow interrupts arrive at level |
| 18 | * 15. |
| Sam Ravnborg | a00736e | 2008-06-19 20:26:19 +0200 | [diff] [blame] | 19 | */ |
| 20 | #define PIL_SMP_CALL_FUNC 1 |
| 21 | #define PIL_SMP_RECEIVE_SIGNAL 2 |
| 22 | #define PIL_SMP_CAPTURE 3 |
| 23 | #define PIL_SMP_CTX_NEW_VERSION 4 |
| 24 | #define PIL_DEVICE_IRQ 5 |
| David S. Miller | d172ad1 | 2008-07-17 23:44:50 -0700 | [diff] [blame] | 25 | #define PIL_SMP_CALL_FUNC_SNGL 6 |
| David S. Miller | 3eb8057 | 2009-01-21 21:30:23 -0800 | [diff] [blame] | 26 | #define PIL_DEFERRED_PCR_WORK 7 |
| David S. Miller | 42cc77c | 2009-03-18 23:51:57 -0700 | [diff] [blame] | 27 | #define PIL_KGDB_CAPTURE 8 |
| David S. Miller | b4f4372 | 2008-11-23 21:55:29 -0800 | [diff] [blame] | 28 | #define PIL_NORMAL_MAX 14 |
| 29 | #define PIL_NMI 15 |
| Sam Ravnborg | a00736e | 2008-06-19 20:26:19 +0200 | [diff] [blame] | 30 | |
| 31 | #endif /* !(_SPARC64_PIL_H) */ |