1 /* 2 * Intel(R) Processor Trace PMU driver for perf 3 * Copyright (c) 2013-2014, Intel Corporation. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * Intel PT is specified in the Intel Architecture Instruction Set Extensions 15 * Programming Reference: 16 * http://software.intel.com/en-us/intel-isa-extensions 17 */ 18 19 #ifndef __INTEL_PT_H__ 20 #define __INTEL_PT_H__ 21 22 /* 23 * Single-entry ToPA: when this close to region boundary, switch 24 * buffers to avoid losing data. 25 */ 26 #define TOPA_PMI_MARGIN 512 27 28 #define TOPA_SHIFT 12 29 30 static inline unsigned int sizes(unsigned int tsz) 31 { 32 return 1 << (tsz + TOPA_SHIFT); 33 }; 34 35 struct topa_entry { 36 u64 end : 1; 37 u64 rsvd0 : 1; 38 u64 intr : 1; 39 u64 rsvd1 : 1; 40 u64 stop : 1; 41 u64 rsvd2 : 1; 42 u64 size : 4; 43 u64 rsvd3 : 2; 44 u64 base : 36; 45 u64 rsvd4 : 16; 46 }; 47 48 #define PT_CPUID_LEAVES 2 49 #define PT_CPUID_REGS_NUM 4 /* number of regsters (eax, ebx, ecx, edx) */ 50 51 enum pt_capabilities { 52 PT_CAP_max_subleaf = 0, 53 PT_CAP_cr3_filtering, 54 PT_CAP_psb_cyc, 55 PT_CAP_mtc, 56 PT_CAP_topa_output, 57 PT_CAP_topa_multiple_entries, 58 PT_CAP_single_range_output, 59 PT_CAP_payloads_lip, 60 PT_CAP_mtc_periods, 61 PT_CAP_cycle_thresholds, 62 PT_CAP_psb_periods, 63 }; 64 65 struct pt_pmu { 66 struct pmu pmu; 67 u32 caps[PT_CPUID_REGS_NUM * PT_CPUID_LEAVES]; 68 }; 69 70 /** 71 * struct pt_buffer - buffer configuration; one buffer per task_struct or 72 * cpu, depending on perf event configuration 73 * @cpu: cpu for per-cpu allocation 74 * @tables: list of ToPA tables in this buffer 75 * @first: shorthand for first topa table 76 * @last: shorthand for last topa table 77 * @cur: current topa table 78 * @nr_pages: buffer size in pages 79 * @cur_idx: current output region's index within @cur table 80 * @output_off: offset within the current output region 81 * @data_size: running total of the amount of data in this buffer 82 * @lost: if data was lost/truncated 83 * @head: logical write offset inside the buffer 84 * @snapshot: if this is for a snapshot/overwrite counter 85 * @stop_pos: STOP topa entry in the buffer 86 * @intr_pos: INT topa entry in the buffer 87 * @data_pages: array of pages from perf 88 * @topa_index: table of topa entries indexed by page offset 89 */ 90 struct pt_buffer { 91 int cpu; 92 struct list_head tables; 93 struct topa *first, *last, *cur; 94 unsigned int cur_idx; 95 size_t output_off; 96 unsigned long nr_pages; 97 local_t data_size; 98 local_t lost; 99 local64_t head; 100 bool snapshot; 101 unsigned long stop_pos, intr_pos; 102 void **data_pages; 103 struct topa_entry *topa_index[0]; 104 }; 105 106 /** 107 * struct pt - per-cpu pt context 108 * @handle: perf output handle 109 * @handle_nmi: do handle PT PMI on this cpu, there's an active event 110 */ 111 struct pt { 112 struct perf_output_handle handle; 113 int handle_nmi; 114 }; 115 116 #endif /* __INTEL_PT_H__ */ 117