| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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) */ |