1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * intel_pt_decoder.h: Intel Processor Trace support
4 * Copyright (c) 2013-2014, Intel Corporation.
5 */
6
7 #ifndef INCLUDE__INTEL_PT_DECODER_H__
8 #define INCLUDE__INTEL_PT_DECODER_H__
9
10 #include <stdint.h>
11 #include <stddef.h>
12 #include <stdbool.h>
13
14 #include <linux/rbtree.h>
15
16 #include "intel-pt-insn-decoder.h"
17
18 #define INTEL_PT_IN_TX (1 << 0)
19 #define INTEL_PT_ABORT_TX (1 << 1)
20 #define INTEL_PT_IFLAG (1 << 2)
21 #define INTEL_PT_ASYNC (1 << 2)
22 #define INTEL_PT_FUP_IP (1 << 3)
23 #define INTEL_PT_SAMPLE_IPC (1 << 4)
24
25 enum intel_pt_sample_type {
26 INTEL_PT_BRANCH = 1 << 0,
27 INTEL_PT_INSTRUCTION = 1 << 1,
28 INTEL_PT_TRANSACTION = 1 << 2,
29 INTEL_PT_PTW = 1 << 3,
30 INTEL_PT_MWAIT_OP = 1 << 4,
31 INTEL_PT_PWR_ENTRY = 1 << 5,
32 INTEL_PT_EX_STOP = 1 << 6,
33 INTEL_PT_PWR_EXIT = 1 << 7,
34 INTEL_PT_CBR_CHG = 1 << 8,
35 INTEL_PT_TRACE_BEGIN = 1 << 9,
36 INTEL_PT_TRACE_END = 1 << 10,
37 INTEL_PT_BLK_ITEMS = 1 << 11,
38 INTEL_PT_PSB_EVT = 1 << 12,
39 INTEL_PT_EVT = 1 << 13,
40 INTEL_PT_IFLAG_CHG = 1 << 14,
41 };
42
43 enum intel_pt_period_type {
44 INTEL_PT_PERIOD_NONE,
45 INTEL_PT_PERIOD_INSTRUCTIONS,
46 INTEL_PT_PERIOD_TICKS,
47 INTEL_PT_PERIOD_MTC,
48 };
49
50 enum {
51 INTEL_PT_ERR_NOMEM = 1,
52 INTEL_PT_ERR_INTERN,
53 INTEL_PT_ERR_BADPKT,
54 INTEL_PT_ERR_NODATA,
55 INTEL_PT_ERR_NOINSN,
56 INTEL_PT_ERR_MISMAT,
57 INTEL_PT_ERR_OVR,
58 INTEL_PT_ERR_LOST,
59 INTEL_PT_ERR_UNK,
60 INTEL_PT_ERR_NELOOP,
61 INTEL_PT_ERR_EPTW,
62 INTEL_PT_ERR_MAX,
63 };
64
65 enum intel_pt_param_flags {
66 /*
67 * FUP packet can contain next linear instruction pointer instead of
68 * current linear instruction pointer.
69 */
70 INTEL_PT_FUP_WITH_NLIP = 1 << 0,
71 };
72
73 enum intel_pt_blk_type {
74 INTEL_PT_GP_REGS = 1,
75 INTEL_PT_PEBS_BASIC = 4,
76 INTEL_PT_PEBS_MEM = 5,
77 INTEL_PT_LBR_0 = 8,
78 INTEL_PT_LBR_1 = 9,
79 INTEL_PT_LBR_2 = 10,
80 INTEL_PT_XMM = 16,
81 INTEL_PT_BLK_TYPE_MAX
82 };
83
84 /*
85 * The block type numbers are not sequential but here they are given sequential
86 * positions to avoid wasting space for array placement.
87 */
88 enum intel_pt_blk_type_pos {
89 INTEL_PT_GP_REGS_POS,
90 INTEL_PT_PEBS_BASIC_POS,
91 INTEL_PT_PEBS_MEM_POS,
92 INTEL_PT_LBR_0_POS,
93 INTEL_PT_LBR_1_POS,
94 INTEL_PT_LBR_2_POS,
95 INTEL_PT_XMM_POS,
96 INTEL_PT_BLK_TYPE_CNT
97 };
98
99 /* Get the array position for a block type */
100 static inline int intel_pt_blk_type_pos(enum intel_pt_blk_type blk_type)
101 {
102 #define BLK_TYPE(bt) [INTEL_PT_##bt] = INTEL_PT_##bt##_POS + 1
103 const int map[INTEL_PT_BLK_TYPE_MAX] = {
104 BLK_TYPE(GP_REGS),
105 BLK_TYPE(PEBS_BASIC),
106 BLK_TYPE(PEBS_MEM),
107 BLK_TYPE(LBR_0),
108 BLK_TYPE(LBR_1),
109 BLK_TYPE(LBR_2),
110 BLK_TYPE(XMM),
111 };
112 #undef BLK_TYPE
113
114 return blk_type < INTEL_PT_BLK_TYPE_MAX ? map[blk_type] - 1 : -1;
115 }
116
117 #define INTEL_PT_BLK_ITEM_ID_CNT 32
118
119 /*
120 * Use unions so that the block items can be accessed by name or by array index.
121 * There is an array of 32-bit masks for each block type, which indicate which
122 * values are present. Then arrays of 32 64-bit values for each block type.
123 */
124 struct intel_pt_blk_items {
125 union {
126 uint32_t mask[INTEL_PT_BLK_TYPE_CNT];
127 struct {
128 uint32_t has_rflags:1;
129 uint32_t has_rip:1;
130 uint32_t has_rax:1;
131 uint32_t has_rcx:1;
132 uint32_t has_rdx:1;
133 uint32_t has_rbx:1;
134 uint32_t has_rsp:1;
135 uint32_t has_rbp:1;
136 uint32_t has_rsi:1;
137 uint32_t has_rdi:1;
138 uint32_t has_r8:1;
139 uint32_t has_r9:1;
140 uint32_t has_r10:1;
141 uint32_t has_r11:1;
142 uint32_t has_r12:1;
143 uint32_t has_r13:1;
144 uint32_t has_r14:1;
145 uint32_t has_r15:1;
146 uint32_t has_unused_0:14;
147 uint32_t has_ip:1;
148 uint32_t has_applicable_counters:1;
149 uint32_t has_timestamp:1;
150 uint32_t has_unused_1:29;
151 uint32_t has_mem_access_address:1;
152 uint32_t has_mem_aux_info:1;
153 uint32_t has_mem_access_latency:1;
154 uint32_t has_tsx_aux_info:1;
155 uint32_t has_unused_2:28;
156 uint32_t has_lbr_0;
157 uint32_t has_lbr_1;
158 uint32_t has_lbr_2;
159 uint32_t has_xmm;
160 };
161 };
162 union {
163 uint64_t val[INTEL_PT_BLK_TYPE_CNT][INTEL_PT_BLK_ITEM_ID_CNT];
164 struct {
165 struct {
166 uint64_t rflags;
167 uint64_t rip;
168 uint64_t rax;
169 uint64_t rcx;
170 uint64_t rdx;
171 uint64_t rbx;
172 uint64_t rsp;
173 uint64_t rbp;
174 uint64_t rsi;
175 uint64_t rdi;
176 uint64_t r8;
177 uint64_t r9;
178 uint64_t r10;
179 uint64_t r11;
180 uint64_t r12;
181 uint64_t r13;
182 uint64_t r14;
183 uint64_t r15;
184 uint64_t unused_0[INTEL_PT_BLK_ITEM_ID_CNT - 18];
185 };
186 struct {
187 uint64_t ip;
188 uint64_t applicable_counters;
189 uint64_t timestamp;
190 uint64_t unused_1[INTEL_PT_BLK_ITEM_ID_CNT - 3];
191 };
192 struct {
193 uint64_t mem_access_address;
194 uint64_t mem_aux_info;
195 uint64_t mem_access_latency;
196 uint64_t tsx_aux_info;
197 uint64_t unused_2[INTEL_PT_BLK_ITEM_ID_CNT - 4];
198 };
199 uint64_t lbr_0[INTEL_PT_BLK_ITEM_ID_CNT];
200 uint64_t lbr_1[INTEL_PT_BLK_ITEM_ID_CNT];
201 uint64_t lbr_2[INTEL_PT_BLK_ITEM_ID_CNT];
202 uint64_t xmm[INTEL_PT_BLK_ITEM_ID_CNT];
203 };
204 };
205 bool is_32_bit;
206 };
207
208 struct intel_pt_vmcs_info {
209 struct rb_node rb_node;
210 uint64_t vmcs;
211 uint64_t tsc_offset;
212 bool reliable;
213 bool error_printed;
214 };
215
216 /*
217 * Maximum number of event trace data in one go, assuming at most 1 per type
218 * and 6-bits of type in the EVD packet.
219 */
220 #define INTEL_PT_MAX_EVDS 64
221
222 /* Event trace data from EVD packet */
223 struct intel_pt_evd {
224 int type;
225 uint64_t payload;
226 };
227
228 struct intel_pt_state {
229 enum intel_pt_sample_type type;
230 bool from_nr;
231 bool to_nr;
232 bool from_iflag;
233 bool to_iflag;
234 int err;
235 uint64_t from_ip;
236 uint64_t to_ip;
237 uint64_t tot_insn_cnt;
238 uint64_t tot_cyc_cnt;
239 uint64_t cycles;
240 uint64_t timestamp;
241 uint64_t est_timestamp;
242 uint64_t trace_nr;
243 uint64_t ptw_payload;
244 uint64_t mwait_payload;
245 uint64_t pwre_payload;
246 uint64_t pwrx_payload;
247 uint64_t cbr_payload;
248 uint64_t psb_offset;
249 uint32_t cbr;
250 uint32_t flags;
251 enum intel_pt_insn_op insn_op;
252 int insn_len;
253 char insn[INTEL_PT_INSN_BUF_SZ];
254 struct intel_pt_blk_items items;
255 int cfe_type;
256 int cfe_vector;
257 int evd_cnt;
258 struct intel_pt_evd *evd;
259 };
260
261 struct intel_pt_insn;
262
263 struct intel_pt_buffer {
264 const unsigned char *buf;
265 size_t len;
266 bool consecutive;
267 uint64_t ref_timestamp;
268 uint64_t trace_nr;
269 };
270
271 typedef int (*intel_pt_lookahead_cb_t)(struct intel_pt_buffer *, void *);
272
273 struct intel_pt_params {
274 int (*get_trace)(struct intel_pt_buffer *buffer, void *data);
275 int (*walk_insn)(struct intel_pt_insn *intel_pt_insn,
276 uint64_t *insn_cnt_ptr, uint64_t *ip, uint64_t to_ip,
277 uint64_t max_insn_cnt, void *data);
278 bool (*pgd_ip)(uint64_t ip, void *data);
279 int (*lookahead)(void *data, intel_pt_lookahead_cb_t cb, void *cb_data);
280 struct intel_pt_vmcs_info *(*findnew_vmcs_info)(void *data, uint64_t vmcs);
281 void *data;
282 bool return_compression;
283 bool branch_enable;
284 bool vm_time_correlation;
285 bool vm_tm_corr_dry_run;
286 uint64_t first_timestamp;
287 uint64_t ctl;
288 uint64_t period;
289 enum intel_pt_period_type period_type;
290 unsigned max_non_turbo_ratio;
291 unsigned int mtc_period;
292 uint32_t tsc_ctc_ratio_n;
293 uint32_t tsc_ctc_ratio_d;
294 enum intel_pt_param_flags flags;
295 unsigned int quick;
296 int max_loops;
297 };
298
299 struct intel_pt_decoder;
300
301 struct intel_pt_decoder *intel_pt_decoder_new(struct intel_pt_params *params);
302 void intel_pt_decoder_free(struct intel_pt_decoder *decoder);
303
304 const struct intel_pt_state *intel_pt_decode(struct intel_pt_decoder *decoder);
305
306 int intel_pt_fast_forward(struct intel_pt_decoder *decoder, uint64_t timestamp);
307
308 unsigned char *intel_pt_find_overlap(unsigned char *buf_a, size_t len_a,
309 unsigned char *buf_b, size_t len_b,
310 bool have_tsc, bool *consecutive,
311 bool ooo_tsc);
312
313 int intel_pt__strerror(int code, char *buf, size_t buflen);
314
315 void intel_pt_set_first_timestamp(struct intel_pt_decoder *decoder,
316 uint64_t first_timestamp);
317
318 #endif
319
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