projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| eee3af4a MM |
1 | /* |
| 2 | * Debug Store (DS) support | |
| 3 | * | |
| 4 | * This provides a low-level interface to the hardware's Debug Store | |
| 5 | * feature that is used for last branch recording (LBR) and | |
| 6 | * precise-event based sampling (PEBS). | |
| 7 | * | |
| 8 | * Different architectures use a different DS layout/pointer size. | |
| 9 | * The below functions therefore work on a void*. | |
| 10 | * | |
| 11 | * | |
| 12 | * Since there is no user for PEBS, yet, only LBR (or branch | |
| 13 | * trace store, BTS) is supported. | |
| 14 | * | |
| 15 | * | |
| 16 | * Copyright (C) 2007 Intel Corporation. | |
| 17 | * Markus Metzger <markus.t.metzger@intel.com>, Dec 2007 | |
| 18 | */ | |
| 19 | ||
| 20 | #ifndef _ASM_X86_DS_H | |
| 21 | #define _ASM_X86_DS_H | |
| 22 | ||
| 23 | #include <linux/types.h> | |
| 24 | #include <linux/init.h> | |
| 25 | ||
| 26 | struct cpuinfo_x86; | |
| 27 | ||
| 28 | ||
| 29 | /* a branch trace record entry | |
| 30 | * | |
| 31 | * In order to unify the interface between various processor versions, | |
| 32 | * we use the below data structure for all processors. | |
| 33 | */ | |
| 34 | enum bts_qualifier { | |
| 35 | BTS_INVALID = 0, | |
| 36 | BTS_BRANCH, | |
| 37 | BTS_TASK_ARRIVES, | |
| 38 | BTS_TASK_DEPARTS | |
| 39 | }; | |
| 40 | ||
| 41 | struct bts_struct { | |
| e6ae5d95 | 42 | u64 qualifier; |
| eee3af4a MM |
43 | union { |
| 44 | /* BTS_BRANCH */ | |
| 45 | struct { | |
| e6ae5d95 MM |
46 | u64 from_ip; |
| 47 | u64 to_ip; | |
| eee3af4a MM |
48 | } lbr; |
| 49 | /* BTS_TASK_ARRIVES or | |
| 50 | BTS_TASK_DEPARTS */ | |
| e6ae5d95 | 51 | u64 jiffies; |
| eee3af4a MM |
52 | } variant; |
| 53 | }; | |
| 54 | ||
| a95d67f8 MM |
55 | /* Overflow handling mechanisms */ |
| 56 | #define DS_O_SIGNAL 1 /* send overflow signal */ | |
| 57 | #define DS_O_WRAP 2 /* wrap around */ | |
| eee3af4a MM |
58 | |
| 59 | extern int ds_allocate(void **, size_t); | |
| 60 | extern int ds_free(void **); | |
| 61 | extern int ds_get_bts_size(void *); | |
| a95d67f8 | 62 | extern int ds_get_bts_end(void *); |
| eee3af4a | 63 | extern int ds_get_bts_index(void *); |
| a95d67f8 MM |
64 | extern int ds_set_overflow(void *, int); |
| 65 | extern int ds_get_overflow(void *); | |
| 66 | extern int ds_clear(void *); | |
| e6ae5d95 | 67 | extern int ds_read_bts(void *, int, struct bts_struct *); |
| eee3af4a MM |
68 | extern int ds_write_bts(void *, const struct bts_struct *); |
| 69 | extern unsigned long ds_debugctl_mask(void); | |
| 70 | extern void __cpuinit ds_init_intel(struct cpuinfo_x86 *c); | |
| 71 | ||
| 72 | #endif /* _ASM_X86_DS_H */ |