Commit | Line | Data |
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de0428a7 KW |
1 | #include <linux/perf_event.h> |
2 | #include <linux/types.h> | |
3 | ||
4 | #include <asm/perf_event.h> | |
5 | #include <asm/msr.h> | |
3e702ff6 | 6 | #include <asm/insn.h> |
de0428a7 | 7 | |
27f6d22b | 8 | #include "../perf_event.h" |
caff2bef PZ |
9 | |
10 | enum { | |
11 | LBR_FORMAT_32 = 0x00, | |
12 | LBR_FORMAT_LIP = 0x01, | |
13 | LBR_FORMAT_EIP = 0x02, | |
14 | LBR_FORMAT_EIP_FLAGS = 0x03, | |
135c5612 | 15 | LBR_FORMAT_EIP_FLAGS2 = 0x04, |
50eab8f6 | 16 | LBR_FORMAT_INFO = 0x05, |
8b92c3a7 KL |
17 | LBR_FORMAT_TIME = 0x06, |
18 | LBR_FORMAT_MAX_KNOWN = LBR_FORMAT_TIME, | |
135c5612 AK |
19 | }; |
20 | ||
21 | static enum { | |
22 | LBR_EIP_FLAGS = 1, | |
23 | LBR_TSX = 2, | |
24 | } lbr_desc[LBR_FORMAT_MAX_KNOWN + 1] = { | |
25 | [LBR_FORMAT_EIP_FLAGS] = LBR_EIP_FLAGS, | |
26 | [LBR_FORMAT_EIP_FLAGS2] = LBR_EIP_FLAGS | LBR_TSX, | |
caff2bef PZ |
27 | }; |
28 | ||
c5cc2cd9 SE |
29 | /* |
30 | * Intel LBR_SELECT bits | |
31 | * Intel Vol3a, April 2011, Section 16.7 Table 16-10 | |
32 | * | |
33 | * Hardware branch filter (not available on all CPUs) | |
34 | */ | |
35 | #define LBR_KERNEL_BIT 0 /* do not capture at ring0 */ | |
36 | #define LBR_USER_BIT 1 /* do not capture at ring > 0 */ | |
37 | #define LBR_JCC_BIT 2 /* do not capture conditional branches */ | |
38 | #define LBR_REL_CALL_BIT 3 /* do not capture relative calls */ | |
39 | #define LBR_IND_CALL_BIT 4 /* do not capture indirect calls */ | |
40 | #define LBR_RETURN_BIT 5 /* do not capture near returns */ | |
41 | #define LBR_IND_JMP_BIT 6 /* do not capture indirect jumps */ | |
42 | #define LBR_REL_JMP_BIT 7 /* do not capture relative jumps */ | |
43 | #define LBR_FAR_BIT 8 /* do not capture far branches */ | |
e9d7f7cd | 44 | #define LBR_CALL_STACK_BIT 9 /* enable call stack */ |
c5cc2cd9 | 45 | |
b16a5b52 AK |
46 | /* |
47 | * Following bit only exists in Linux; we mask it out before writing it to | |
48 | * the actual MSR. But it helps the constraint perf code to understand | |
49 | * that this is a separate configuration. | |
50 | */ | |
51 | #define LBR_NO_INFO_BIT 63 /* don't read LBR_INFO. */ | |
52 | ||
c5cc2cd9 SE |
53 | #define LBR_KERNEL (1 << LBR_KERNEL_BIT) |
54 | #define LBR_USER (1 << LBR_USER_BIT) | |
55 | #define LBR_JCC (1 << LBR_JCC_BIT) | |
56 | #define LBR_REL_CALL (1 << LBR_REL_CALL_BIT) | |
57 | #define LBR_IND_CALL (1 << LBR_IND_CALL_BIT) | |
58 | #define LBR_RETURN (1 << LBR_RETURN_BIT) | |
59 | #define LBR_REL_JMP (1 << LBR_REL_JMP_BIT) | |
60 | #define LBR_IND_JMP (1 << LBR_IND_JMP_BIT) | |
61 | #define LBR_FAR (1 << LBR_FAR_BIT) | |
e9d7f7cd | 62 | #define LBR_CALL_STACK (1 << LBR_CALL_STACK_BIT) |
b16a5b52 | 63 | #define LBR_NO_INFO (1ULL << LBR_NO_INFO_BIT) |
c5cc2cd9 SE |
64 | |
65 | #define LBR_PLM (LBR_KERNEL | LBR_USER) | |
66 | ||
cf3beb7c | 67 | #define LBR_SEL_MASK 0x3ff /* valid bits in LBR_SELECT */ |
c5cc2cd9 SE |
68 | #define LBR_NOT_SUPP -1 /* LBR filter not supported */ |
69 | #define LBR_IGN 0 /* ignored */ | |
70 | ||
71 | #define LBR_ANY \ | |
72 | (LBR_JCC |\ | |
73 | LBR_REL_CALL |\ | |
74 | LBR_IND_CALL |\ | |
75 | LBR_RETURN |\ | |
76 | LBR_REL_JMP |\ | |
77 | LBR_IND_JMP |\ | |
78 | LBR_FAR) | |
79 | ||
3812bba8 DCC |
80 | #define LBR_FROM_FLAG_MISPRED BIT_ULL(63) |
81 | #define LBR_FROM_FLAG_IN_TX BIT_ULL(62) | |
82 | #define LBR_FROM_FLAG_ABORT BIT_ULL(61) | |
c5cc2cd9 | 83 | |
19fc9ddd DCC |
84 | #define LBR_FROM_SIGNEXT_2MSB (BIT_ULL(60) | BIT_ULL(59)) |
85 | ||
3e702ff6 SE |
86 | /* |
87 | * x86control flow change classification | |
88 | * x86control flow changes include branches, interrupts, traps, faults | |
89 | */ | |
90 | enum { | |
e9d7f7cd YZ |
91 | X86_BR_NONE = 0, /* unknown */ |
92 | ||
93 | X86_BR_USER = 1 << 0, /* branch target is user */ | |
94 | X86_BR_KERNEL = 1 << 1, /* branch target is kernel */ | |
95 | ||
96 | X86_BR_CALL = 1 << 2, /* call */ | |
97 | X86_BR_RET = 1 << 3, /* return */ | |
98 | X86_BR_SYSCALL = 1 << 4, /* syscall */ | |
99 | X86_BR_SYSRET = 1 << 5, /* syscall return */ | |
100 | X86_BR_INT = 1 << 6, /* sw interrupt */ | |
101 | X86_BR_IRET = 1 << 7, /* return from interrupt */ | |
102 | X86_BR_JCC = 1 << 8, /* conditional */ | |
103 | X86_BR_JMP = 1 << 9, /* jump */ | |
104 | X86_BR_IRQ = 1 << 10,/* hw interrupt or trap or fault */ | |
105 | X86_BR_IND_CALL = 1 << 11,/* indirect calls */ | |
106 | X86_BR_ABORT = 1 << 12,/* transaction abort */ | |
107 | X86_BR_IN_TX = 1 << 13,/* in transaction */ | |
108 | X86_BR_NO_TX = 1 << 14,/* not in transaction */ | |
aa54ae9b YZ |
109 | X86_BR_ZERO_CALL = 1 << 15,/* zero length call */ |
110 | X86_BR_CALL_STACK = 1 << 16,/* call stack */ | |
7b74cfb2 | 111 | X86_BR_IND_JMP = 1 << 17,/* indirect jump */ |
3e702ff6 SE |
112 | }; |
113 | ||
114 | #define X86_BR_PLM (X86_BR_USER | X86_BR_KERNEL) | |
135c5612 | 115 | #define X86_BR_ANYTX (X86_BR_NO_TX | X86_BR_IN_TX) |
3e702ff6 SE |
116 | |
117 | #define X86_BR_ANY \ | |
118 | (X86_BR_CALL |\ | |
119 | X86_BR_RET |\ | |
120 | X86_BR_SYSCALL |\ | |
121 | X86_BR_SYSRET |\ | |
122 | X86_BR_INT |\ | |
123 | X86_BR_IRET |\ | |
124 | X86_BR_JCC |\ | |
125 | X86_BR_JMP |\ | |
126 | X86_BR_IRQ |\ | |
135c5612 | 127 | X86_BR_ABORT |\ |
aa54ae9b | 128 | X86_BR_IND_CALL |\ |
7b74cfb2 | 129 | X86_BR_IND_JMP |\ |
aa54ae9b | 130 | X86_BR_ZERO_CALL) |
3e702ff6 SE |
131 | |
132 | #define X86_BR_ALL (X86_BR_PLM | X86_BR_ANY) | |
133 | ||
134 | #define X86_BR_ANY_CALL \ | |
135 | (X86_BR_CALL |\ | |
136 | X86_BR_IND_CALL |\ | |
aa54ae9b | 137 | X86_BR_ZERO_CALL |\ |
3e702ff6 SE |
138 | X86_BR_SYSCALL |\ |
139 | X86_BR_IRQ |\ | |
140 | X86_BR_INT) | |
141 | ||
142 | static void intel_pmu_lbr_filter(struct cpu_hw_events *cpuc); | |
143 | ||
caff2bef PZ |
144 | /* |
145 | * We only support LBR implementations that have FREEZE_LBRS_ON_PMI | |
146 | * otherwise it becomes near impossible to get a reliable stack. | |
147 | */ | |
148 | ||
1a78d937 | 149 | static void __intel_pmu_lbr_enable(bool pmi) |
caff2bef | 150 | { |
89cbc767 | 151 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
cd1f11de | 152 | u64 debugctl, lbr_select = 0, orig_debugctl; |
60ce0fbd | 153 | |
425507fa AK |
154 | /* |
155 | * No need to unfreeze manually, as v4 can do that as part | |
156 | * of the GLOBAL_STATUS ack. | |
157 | */ | |
158 | if (pmi && x86_pmu.version >= 4) | |
159 | return; | |
160 | ||
1a78d937 AK |
161 | /* |
162 | * No need to reprogram LBR_SELECT in a PMI, as it | |
163 | * did not change. | |
164 | */ | |
96f3eda6 | 165 | if (cpuc->lbr_sel) |
b16a5b52 | 166 | lbr_select = cpuc->lbr_sel->config & x86_pmu.lbr_sel_mask; |
6fc2e830 | 167 | if (!pmi && cpuc->lbr_sel) |
2c70d008 | 168 | wrmsrl(MSR_LBR_SELECT, lbr_select); |
caff2bef PZ |
169 | |
170 | rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctl); | |
cd1f11de | 171 | orig_debugctl = debugctl; |
2c70d008 YZ |
172 | debugctl |= DEBUGCTLMSR_LBR; |
173 | /* | |
174 | * LBR callstack does not work well with FREEZE_LBRS_ON_PMI. | |
175 | * If FREEZE_LBRS_ON_PMI is set, PMI near call/return instructions | |
176 | * may cause superfluous increase/decrease of LBR_TOS. | |
177 | */ | |
178 | if (!(lbr_select & LBR_CALL_STACK)) | |
179 | debugctl |= DEBUGCTLMSR_FREEZE_LBRS_ON_PMI; | |
cd1f11de AK |
180 | if (orig_debugctl != debugctl) |
181 | wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctl); | |
caff2bef PZ |
182 | } |
183 | ||
184 | static void __intel_pmu_lbr_disable(void) | |
185 | { | |
186 | u64 debugctl; | |
187 | ||
188 | rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctl); | |
7c5ecaf7 | 189 | debugctl &= ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_FREEZE_LBRS_ON_PMI); |
caff2bef PZ |
190 | wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctl); |
191 | } | |
192 | ||
193 | static void intel_pmu_lbr_reset_32(void) | |
194 | { | |
195 | int i; | |
196 | ||
197 | for (i = 0; i < x86_pmu.lbr_nr; i++) | |
198 | wrmsrl(x86_pmu.lbr_from + i, 0); | |
199 | } | |
200 | ||
201 | static void intel_pmu_lbr_reset_64(void) | |
202 | { | |
203 | int i; | |
204 | ||
205 | for (i = 0; i < x86_pmu.lbr_nr; i++) { | |
206 | wrmsrl(x86_pmu.lbr_from + i, 0); | |
207 | wrmsrl(x86_pmu.lbr_to + i, 0); | |
50eab8f6 AK |
208 | if (x86_pmu.intel_cap.lbr_format == LBR_FORMAT_INFO) |
209 | wrmsrl(MSR_LBR_INFO_0 + i, 0); | |
caff2bef PZ |
210 | } |
211 | } | |
212 | ||
de0428a7 | 213 | void intel_pmu_lbr_reset(void) |
caff2bef | 214 | { |
74846d35 PZ |
215 | if (!x86_pmu.lbr_nr) |
216 | return; | |
217 | ||
8db909a7 | 218 | if (x86_pmu.intel_cap.lbr_format == LBR_FORMAT_32) |
caff2bef PZ |
219 | intel_pmu_lbr_reset_32(); |
220 | else | |
221 | intel_pmu_lbr_reset_64(); | |
222 | } | |
223 | ||
76cb2c61 YZ |
224 | /* |
225 | * TOS = most recently recorded branch | |
226 | */ | |
227 | static inline u64 intel_pmu_lbr_tos(void) | |
228 | { | |
229 | u64 tos; | |
230 | ||
231 | rdmsrl(x86_pmu.lbr_tos, tos); | |
232 | return tos; | |
233 | } | |
234 | ||
235 | enum { | |
236 | LBR_NONE, | |
237 | LBR_VALID, | |
238 | }; | |
239 | ||
19fc9ddd DCC |
240 | /* |
241 | * For formats with LBR_TSX flags (e.g. LBR_FORMAT_EIP_FLAGS2), bits 61:62 in | |
242 | * MSR_LAST_BRANCH_FROM_x are the TSX flags when TSX is supported, but when | |
243 | * TSX is not supported they have no consistent behavior: | |
244 | * | |
245 | * - For wrmsr(), bits 61:62 are considered part of the sign extension. | |
246 | * - For HW updates (branch captures) bits 61:62 are always OFF and are not | |
247 | * part of the sign extension. | |
248 | * | |
249 | * Therefore, if: | |
250 | * | |
251 | * 1) LBR has TSX format | |
252 | * 2) CPU has no TSX support enabled | |
253 | * | |
254 | * ... then any value passed to wrmsr() must be sign extended to 63 bits and any | |
255 | * value from rdmsr() must be converted to have a 61 bits sign extension, | |
256 | * ignoring the TSX flags. | |
257 | */ | |
258 | static inline bool lbr_from_signext_quirk_needed(void) | |
259 | { | |
260 | int lbr_format = x86_pmu.intel_cap.lbr_format; | |
261 | bool tsx_support = boot_cpu_has(X86_FEATURE_HLE) || | |
262 | boot_cpu_has(X86_FEATURE_RTM); | |
263 | ||
264 | return !tsx_support && (lbr_desc[lbr_format] & LBR_TSX); | |
265 | } | |
266 | ||
267 | DEFINE_STATIC_KEY_FALSE(lbr_from_quirk_key); | |
268 | ||
269 | /* If quirk is enabled, ensure sign extension is 63 bits: */ | |
270 | inline u64 lbr_from_signext_quirk_wr(u64 val) | |
271 | { | |
272 | if (static_branch_unlikely(&lbr_from_quirk_key)) { | |
273 | /* | |
274 | * Sign extend into bits 61:62 while preserving bit 63. | |
275 | * | |
276 | * Quirk is enabled when TSX is disabled. Therefore TSX bits | |
277 | * in val are always OFF and must be changed to be sign | |
278 | * extension bits. Since bits 59:60 are guaranteed to be | |
279 | * part of the sign extension bits, we can just copy them | |
280 | * to 61:62. | |
281 | */ | |
282 | val |= (LBR_FROM_SIGNEXT_2MSB & val) << 2; | |
283 | } | |
284 | return val; | |
285 | } | |
286 | ||
71adae99 DCC |
287 | /* |
288 | * If quirk is needed, ensure sign extension is 61 bits: | |
289 | */ | |
290 | u64 lbr_from_signext_quirk_rd(u64 val) | |
291 | { | |
d4cf1949 | 292 | if (static_branch_unlikely(&lbr_from_quirk_key)) { |
71adae99 DCC |
293 | /* |
294 | * Quirk is on when TSX is not enabled. Therefore TSX | |
295 | * flags must be read as OFF. | |
296 | */ | |
297 | val &= ~(LBR_FROM_FLAG_IN_TX | LBR_FROM_FLAG_ABORT); | |
d4cf1949 PZ |
298 | } |
299 | return val; | |
300 | } | |
301 | ||
302 | static inline void wrlbr_from(unsigned int idx, u64 val) | |
303 | { | |
304 | val = lbr_from_signext_quirk_wr(val); | |
305 | wrmsrl(x86_pmu.lbr_from + idx, val); | |
306 | } | |
307 | ||
308 | static inline void wrlbr_to(unsigned int idx, u64 val) | |
309 | { | |
310 | wrmsrl(x86_pmu.lbr_to + idx, val); | |
311 | } | |
312 | ||
313 | static inline u64 rdlbr_from(unsigned int idx) | |
314 | { | |
315 | u64 val; | |
316 | ||
317 | rdmsrl(x86_pmu.lbr_from + idx, val); | |
318 | ||
319 | return lbr_from_signext_quirk_rd(val); | |
320 | } | |
321 | ||
322 | static inline u64 rdlbr_to(unsigned int idx) | |
323 | { | |
324 | u64 val; | |
325 | ||
aefbc4d0 | 326 | rdmsrl(x86_pmu.lbr_to + idx, val); |
d4cf1949 | 327 | |
71adae99 DCC |
328 | return val; |
329 | } | |
330 | ||
76cb2c61 YZ |
331 | static void __intel_pmu_lbr_restore(struct x86_perf_task_context *task_ctx) |
332 | { | |
333 | int i; | |
334 | unsigned lbr_idx, mask; | |
335 | u64 tos; | |
336 | ||
337 | if (task_ctx->lbr_callstack_users == 0 || | |
338 | task_ctx->lbr_stack_state == LBR_NONE) { | |
339 | intel_pmu_lbr_reset(); | |
340 | return; | |
341 | } | |
342 | ||
343 | mask = x86_pmu.lbr_nr - 1; | |
b28ae956 | 344 | tos = task_ctx->tos; |
90405aa0 | 345 | for (i = 0; i < tos; i++) { |
76cb2c61 | 346 | lbr_idx = (tos - i) & mask; |
d4cf1949 PZ |
347 | wrlbr_from(lbr_idx, task_ctx->lbr_from[i]); |
348 | wrlbr_to (lbr_idx, task_ctx->lbr_to[i]); | |
349 | ||
50eab8f6 | 350 | if (x86_pmu.intel_cap.lbr_format == LBR_FORMAT_INFO) |
e0573364 | 351 | wrmsrl(MSR_LBR_INFO_0 + lbr_idx, task_ctx->lbr_info[i]); |
76cb2c61 | 352 | } |
b28ae956 | 353 | wrmsrl(x86_pmu.lbr_tos, tos); |
76cb2c61 YZ |
354 | task_ctx->lbr_stack_state = LBR_NONE; |
355 | } | |
356 | ||
357 | static void __intel_pmu_lbr_save(struct x86_perf_task_context *task_ctx) | |
358 | { | |
76cb2c61 | 359 | unsigned lbr_idx, mask; |
d4cf1949 PZ |
360 | u64 tos; |
361 | int i; | |
76cb2c61 YZ |
362 | |
363 | if (task_ctx->lbr_callstack_users == 0) { | |
364 | task_ctx->lbr_stack_state = LBR_NONE; | |
365 | return; | |
366 | } | |
367 | ||
368 | mask = x86_pmu.lbr_nr - 1; | |
369 | tos = intel_pmu_lbr_tos(); | |
90405aa0 | 370 | for (i = 0; i < tos; i++) { |
76cb2c61 | 371 | lbr_idx = (tos - i) & mask; |
d4cf1949 PZ |
372 | task_ctx->lbr_from[i] = rdlbr_from(lbr_idx); |
373 | task_ctx->lbr_to[i] = rdlbr_to(lbr_idx); | |
50eab8f6 | 374 | if (x86_pmu.intel_cap.lbr_format == LBR_FORMAT_INFO) |
e0573364 | 375 | rdmsrl(MSR_LBR_INFO_0 + lbr_idx, task_ctx->lbr_info[i]); |
76cb2c61 | 376 | } |
b28ae956 | 377 | task_ctx->tos = tos; |
76cb2c61 YZ |
378 | task_ctx->lbr_stack_state = LBR_VALID; |
379 | } | |
380 | ||
2a0ad3b3 YZ |
381 | void intel_pmu_lbr_sched_task(struct perf_event_context *ctx, bool sched_in) |
382 | { | |
383 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); | |
76cb2c61 | 384 | struct x86_perf_task_context *task_ctx; |
2a0ad3b3 | 385 | |
76cb2c61 YZ |
386 | /* |
387 | * If LBR callstack feature is enabled and the stack was saved when | |
388 | * the task was scheduled out, restore the stack. Otherwise flush | |
389 | * the LBR stack. | |
390 | */ | |
391 | task_ctx = ctx ? ctx->task_ctx_data : NULL; | |
392 | if (task_ctx) { | |
393 | if (sched_in) { | |
394 | __intel_pmu_lbr_restore(task_ctx); | |
395 | cpuc->lbr_context = ctx; | |
396 | } else { | |
397 | __intel_pmu_lbr_save(task_ctx); | |
398 | } | |
399 | return; | |
400 | } | |
401 | ||
2a0ad3b3 YZ |
402 | /* |
403 | * When sampling the branck stack in system-wide, it may be | |
404 | * necessary to flush the stack on context switch. This happens | |
405 | * when the branch stack does not tag its entries with the pid | |
406 | * of the current task. Otherwise it becomes impossible to | |
407 | * associate a branch entry with a task. This ambiguity is more | |
408 | * likely to appear when the branch stack supports priv level | |
409 | * filtering and the user sets it to monitor only at the user | |
410 | * level (which could be a useful measurement in system-wide | |
411 | * mode). In that case, the risk is high of having a branch | |
412 | * stack with branch from multiple tasks. | |
413 | */ | |
414 | if (sched_in) { | |
415 | intel_pmu_lbr_reset(); | |
416 | cpuc->lbr_context = ctx; | |
417 | } | |
418 | } | |
419 | ||
63f0c1d8 YZ |
420 | static inline bool branch_user_callstack(unsigned br_sel) |
421 | { | |
422 | return (br_sel & X86_BR_USER) && (br_sel & X86_BR_CALL_STACK); | |
423 | } | |
424 | ||
de0428a7 | 425 | void intel_pmu_lbr_enable(struct perf_event *event) |
caff2bef | 426 | { |
89cbc767 | 427 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
63f0c1d8 | 428 | struct x86_perf_task_context *task_ctx; |
caff2bef PZ |
429 | |
430 | if (!x86_pmu.lbr_nr) | |
431 | return; | |
432 | ||
caff2bef | 433 | /* |
b83a46e7 PZ |
434 | * Reset the LBR stack if we changed task context to |
435 | * avoid data leaks. | |
caff2bef | 436 | */ |
b83a46e7 | 437 | if (event->ctx->task && cpuc->lbr_context != event->ctx) { |
caff2bef PZ |
438 | intel_pmu_lbr_reset(); |
439 | cpuc->lbr_context = event->ctx; | |
440 | } | |
3e702ff6 | 441 | cpuc->br_sel = event->hw.branch_reg.reg; |
caff2bef | 442 | |
63f0c1d8 YZ |
443 | if (branch_user_callstack(cpuc->br_sel) && event->ctx && |
444 | event->ctx->task_ctx_data) { | |
445 | task_ctx = event->ctx->task_ctx_data; | |
446 | task_ctx->lbr_callstack_users++; | |
447 | } | |
448 | ||
caff2bef | 449 | cpuc->lbr_users++; |
2a0ad3b3 | 450 | perf_sched_cb_inc(event->ctx->pmu); |
caff2bef PZ |
451 | } |
452 | ||
de0428a7 | 453 | void intel_pmu_lbr_disable(struct perf_event *event) |
caff2bef | 454 | { |
89cbc767 | 455 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
63f0c1d8 | 456 | struct x86_perf_task_context *task_ctx; |
caff2bef PZ |
457 | |
458 | if (!x86_pmu.lbr_nr) | |
459 | return; | |
460 | ||
63f0c1d8 YZ |
461 | if (branch_user_callstack(cpuc->br_sel) && event->ctx && |
462 | event->ctx->task_ctx_data) { | |
463 | task_ctx = event->ctx->task_ctx_data; | |
464 | task_ctx->lbr_callstack_users--; | |
465 | } | |
466 | ||
caff2bef | 467 | cpuc->lbr_users--; |
b83a46e7 | 468 | WARN_ON_ONCE(cpuc->lbr_users < 0); |
2a0ad3b3 | 469 | perf_sched_cb_dec(event->ctx->pmu); |
2df202bf | 470 | |
60ce0fbd | 471 | if (cpuc->enabled && !cpuc->lbr_users) { |
2df202bf | 472 | __intel_pmu_lbr_disable(); |
60ce0fbd SE |
473 | /* avoid stale pointer */ |
474 | cpuc->lbr_context = NULL; | |
475 | } | |
caff2bef PZ |
476 | } |
477 | ||
1a78d937 | 478 | void intel_pmu_lbr_enable_all(bool pmi) |
caff2bef | 479 | { |
89cbc767 | 480 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
caff2bef PZ |
481 | |
482 | if (cpuc->lbr_users) | |
1a78d937 | 483 | __intel_pmu_lbr_enable(pmi); |
caff2bef PZ |
484 | } |
485 | ||
de0428a7 | 486 | void intel_pmu_lbr_disable_all(void) |
caff2bef | 487 | { |
89cbc767 | 488 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
caff2bef PZ |
489 | |
490 | if (cpuc->lbr_users) | |
491 | __intel_pmu_lbr_disable(); | |
492 | } | |
493 | ||
caff2bef PZ |
494 | static void intel_pmu_lbr_read_32(struct cpu_hw_events *cpuc) |
495 | { | |
496 | unsigned long mask = x86_pmu.lbr_nr - 1; | |
497 | u64 tos = intel_pmu_lbr_tos(); | |
498 | int i; | |
499 | ||
63fb3f9b | 500 | for (i = 0; i < x86_pmu.lbr_nr; i++) { |
caff2bef PZ |
501 | unsigned long lbr_idx = (tos - i) & mask; |
502 | union { | |
503 | struct { | |
504 | u32 from; | |
505 | u32 to; | |
506 | }; | |
507 | u64 lbr; | |
508 | } msr_lastbranch; | |
509 | ||
510 | rdmsrl(x86_pmu.lbr_from + lbr_idx, msr_lastbranch.lbr); | |
511 | ||
bce38cd5 SE |
512 | cpuc->lbr_entries[i].from = msr_lastbranch.from; |
513 | cpuc->lbr_entries[i].to = msr_lastbranch.to; | |
514 | cpuc->lbr_entries[i].mispred = 0; | |
515 | cpuc->lbr_entries[i].predicted = 0; | |
516 | cpuc->lbr_entries[i].reserved = 0; | |
caff2bef PZ |
517 | } |
518 | cpuc->lbr_stack.nr = i; | |
519 | } | |
520 | ||
caff2bef PZ |
521 | /* |
522 | * Due to lack of segmentation in Linux the effective address (offset) | |
523 | * is the same as the linear address, allowing us to merge the LIP and EIP | |
524 | * LBR formats. | |
525 | */ | |
526 | static void intel_pmu_lbr_read_64(struct cpu_hw_events *cpuc) | |
527 | { | |
6fc2e830 | 528 | bool need_info = false; |
caff2bef | 529 | unsigned long mask = x86_pmu.lbr_nr - 1; |
8db909a7 | 530 | int lbr_format = x86_pmu.intel_cap.lbr_format; |
caff2bef PZ |
531 | u64 tos = intel_pmu_lbr_tos(); |
532 | int i; | |
b7af41a1 | 533 | int out = 0; |
90405aa0 | 534 | int num = x86_pmu.lbr_nr; |
caff2bef | 535 | |
6fc2e830 SE |
536 | if (cpuc->lbr_sel) { |
537 | need_info = !(cpuc->lbr_sel->config & LBR_NO_INFO); | |
538 | if (cpuc->lbr_sel->config & LBR_CALL_STACK) | |
539 | num = tos; | |
540 | } | |
90405aa0 AK |
541 | |
542 | for (i = 0; i < num; i++) { | |
caff2bef | 543 | unsigned long lbr_idx = (tos - i) & mask; |
135c5612 AK |
544 | u64 from, to, mis = 0, pred = 0, in_tx = 0, abort = 0; |
545 | int skip = 0; | |
50eab8f6 | 546 | u16 cycles = 0; |
135c5612 | 547 | int lbr_flags = lbr_desc[lbr_format]; |
caff2bef | 548 | |
d4cf1949 PZ |
549 | from = rdlbr_from(lbr_idx); |
550 | to = rdlbr_to(lbr_idx); | |
caff2bef | 551 | |
b16a5b52 | 552 | if (lbr_format == LBR_FORMAT_INFO && need_info) { |
50eab8f6 AK |
553 | u64 info; |
554 | ||
555 | rdmsrl(MSR_LBR_INFO_0 + lbr_idx, info); | |
556 | mis = !!(info & LBR_INFO_MISPRED); | |
557 | pred = !mis; | |
558 | in_tx = !!(info & LBR_INFO_IN_TX); | |
559 | abort = !!(info & LBR_INFO_ABORT); | |
560 | cycles = (info & LBR_INFO_CYCLES); | |
561 | } | |
8b92c3a7 KL |
562 | |
563 | if (lbr_format == LBR_FORMAT_TIME) { | |
564 | mis = !!(from & LBR_FROM_FLAG_MISPRED); | |
565 | pred = !mis; | |
566 | skip = 1; | |
567 | cycles = ((to >> 48) & LBR_INFO_CYCLES); | |
568 | ||
569 | to = (u64)((((s64)to) << 16) >> 16); | |
570 | } | |
571 | ||
135c5612 | 572 | if (lbr_flags & LBR_EIP_FLAGS) { |
bce38cd5 SE |
573 | mis = !!(from & LBR_FROM_FLAG_MISPRED); |
574 | pred = !mis; | |
135c5612 AK |
575 | skip = 1; |
576 | } | |
577 | if (lbr_flags & LBR_TSX) { | |
578 | in_tx = !!(from & LBR_FROM_FLAG_IN_TX); | |
579 | abort = !!(from & LBR_FROM_FLAG_ABORT); | |
580 | skip = 3; | |
caff2bef | 581 | } |
135c5612 | 582 | from = (u64)((((s64)from) << skip) >> skip); |
caff2bef | 583 | |
b7af41a1 AK |
584 | /* |
585 | * Some CPUs report duplicated abort records, | |
586 | * with the second entry not having an abort bit set. | |
587 | * Skip them here. This loop runs backwards, | |
588 | * so we need to undo the previous record. | |
589 | * If the abort just happened outside the window | |
590 | * the extra entry cannot be removed. | |
591 | */ | |
592 | if (abort && x86_pmu.lbr_double_abort && out > 0) | |
593 | out--; | |
594 | ||
595 | cpuc->lbr_entries[out].from = from; | |
596 | cpuc->lbr_entries[out].to = to; | |
597 | cpuc->lbr_entries[out].mispred = mis; | |
598 | cpuc->lbr_entries[out].predicted = pred; | |
599 | cpuc->lbr_entries[out].in_tx = in_tx; | |
600 | cpuc->lbr_entries[out].abort = abort; | |
50eab8f6 | 601 | cpuc->lbr_entries[out].cycles = cycles; |
b7af41a1 AK |
602 | cpuc->lbr_entries[out].reserved = 0; |
603 | out++; | |
caff2bef | 604 | } |
b7af41a1 | 605 | cpuc->lbr_stack.nr = out; |
caff2bef PZ |
606 | } |
607 | ||
de0428a7 | 608 | void intel_pmu_lbr_read(void) |
caff2bef | 609 | { |
89cbc767 | 610 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
caff2bef PZ |
611 | |
612 | if (!cpuc->lbr_users) | |
613 | return; | |
614 | ||
8db909a7 | 615 | if (x86_pmu.intel_cap.lbr_format == LBR_FORMAT_32) |
caff2bef PZ |
616 | intel_pmu_lbr_read_32(cpuc); |
617 | else | |
618 | intel_pmu_lbr_read_64(cpuc); | |
3e702ff6 SE |
619 | |
620 | intel_pmu_lbr_filter(cpuc); | |
621 | } | |
622 | ||
623 | /* | |
624 | * SW filter is used: | |
625 | * - in case there is no HW filter | |
626 | * - in case the HW filter has errata or limitations | |
627 | */ | |
e9d7f7cd | 628 | static int intel_pmu_setup_sw_lbr_filter(struct perf_event *event) |
3e702ff6 SE |
629 | { |
630 | u64 br_type = event->attr.branch_sample_type; | |
631 | int mask = 0; | |
632 | ||
633 | if (br_type & PERF_SAMPLE_BRANCH_USER) | |
634 | mask |= X86_BR_USER; | |
635 | ||
2b923c8f | 636 | if (br_type & PERF_SAMPLE_BRANCH_KERNEL) |
3e702ff6 SE |
637 | mask |= X86_BR_KERNEL; |
638 | ||
639 | /* we ignore BRANCH_HV here */ | |
640 | ||
641 | if (br_type & PERF_SAMPLE_BRANCH_ANY) | |
642 | mask |= X86_BR_ANY; | |
643 | ||
644 | if (br_type & PERF_SAMPLE_BRANCH_ANY_CALL) | |
645 | mask |= X86_BR_ANY_CALL; | |
646 | ||
647 | if (br_type & PERF_SAMPLE_BRANCH_ANY_RETURN) | |
648 | mask |= X86_BR_RET | X86_BR_IRET | X86_BR_SYSRET; | |
649 | ||
650 | if (br_type & PERF_SAMPLE_BRANCH_IND_CALL) | |
651 | mask |= X86_BR_IND_CALL; | |
135c5612 AK |
652 | |
653 | if (br_type & PERF_SAMPLE_BRANCH_ABORT_TX) | |
654 | mask |= X86_BR_ABORT; | |
655 | ||
656 | if (br_type & PERF_SAMPLE_BRANCH_IN_TX) | |
657 | mask |= X86_BR_IN_TX; | |
658 | ||
659 | if (br_type & PERF_SAMPLE_BRANCH_NO_TX) | |
660 | mask |= X86_BR_NO_TX; | |
661 | ||
37548914 AK |
662 | if (br_type & PERF_SAMPLE_BRANCH_COND) |
663 | mask |= X86_BR_JCC; | |
664 | ||
e9d7f7cd YZ |
665 | if (br_type & PERF_SAMPLE_BRANCH_CALL_STACK) { |
666 | if (!x86_pmu_has_lbr_callstack()) | |
667 | return -EOPNOTSUPP; | |
668 | if (mask & ~(X86_BR_USER | X86_BR_KERNEL)) | |
669 | return -EINVAL; | |
670 | mask |= X86_BR_CALL | X86_BR_IND_CALL | X86_BR_RET | | |
671 | X86_BR_CALL_STACK; | |
672 | } | |
673 | ||
7b74cfb2 SE |
674 | if (br_type & PERF_SAMPLE_BRANCH_IND_JUMP) |
675 | mask |= X86_BR_IND_JMP; | |
676 | ||
d892819f SE |
677 | if (br_type & PERF_SAMPLE_BRANCH_CALL) |
678 | mask |= X86_BR_CALL | X86_BR_ZERO_CALL; | |
3e702ff6 SE |
679 | /* |
680 | * stash actual user request into reg, it may | |
681 | * be used by fixup code for some CPU | |
682 | */ | |
683 | event->hw.branch_reg.reg = mask; | |
e9d7f7cd | 684 | return 0; |
caff2bef PZ |
685 | } |
686 | ||
60ce0fbd SE |
687 | /* |
688 | * setup the HW LBR filter | |
689 | * Used only when available, may not be enough to disambiguate | |
690 | * all branches, may need the help of the SW filter | |
691 | */ | |
692 | static int intel_pmu_setup_hw_lbr_filter(struct perf_event *event) | |
693 | { | |
694 | struct hw_perf_event_extra *reg; | |
695 | u64 br_type = event->attr.branch_sample_type; | |
27ac905b YZ |
696 | u64 mask = 0, v; |
697 | int i; | |
60ce0fbd | 698 | |
2c44b193 | 699 | for (i = 0; i < PERF_SAMPLE_BRANCH_MAX_SHIFT; i++) { |
27ac905b | 700 | if (!(br_type & (1ULL << i))) |
60ce0fbd SE |
701 | continue; |
702 | ||
27ac905b | 703 | v = x86_pmu.lbr_sel_map[i]; |
60ce0fbd SE |
704 | if (v == LBR_NOT_SUPP) |
705 | return -EOPNOTSUPP; | |
60ce0fbd | 706 | |
3e702ff6 SE |
707 | if (v != LBR_IGN) |
708 | mask |= v; | |
60ce0fbd | 709 | } |
b16a5b52 | 710 | |
60ce0fbd SE |
711 | reg = &event->hw.branch_reg; |
712 | reg->idx = EXTRA_REG_LBR; | |
713 | ||
e9d7f7cd YZ |
714 | /* |
715 | * The first 9 bits (LBR_SEL_MASK) in LBR_SELECT operate | |
716 | * in suppress mode. So LBR_SELECT should be set to | |
717 | * (~mask & LBR_SEL_MASK) | (mask & ~LBR_SEL_MASK) | |
cf3beb7c KL |
718 | * But the 10th bit LBR_CALL_STACK does not operate |
719 | * in suppress mode. | |
e9d7f7cd | 720 | */ |
cf3beb7c | 721 | reg->config = mask ^ (x86_pmu.lbr_sel_mask & ~LBR_CALL_STACK); |
60ce0fbd | 722 | |
b16a5b52 AK |
723 | if ((br_type & PERF_SAMPLE_BRANCH_NO_CYCLES) && |
724 | (br_type & PERF_SAMPLE_BRANCH_NO_FLAGS) && | |
725 | (x86_pmu.intel_cap.lbr_format == LBR_FORMAT_INFO)) | |
726 | reg->config |= LBR_NO_INFO; | |
727 | ||
60ce0fbd SE |
728 | return 0; |
729 | } | |
730 | ||
60ce0fbd SE |
731 | int intel_pmu_setup_lbr_filter(struct perf_event *event) |
732 | { | |
3e702ff6 | 733 | int ret = 0; |
60ce0fbd SE |
734 | |
735 | /* | |
736 | * no LBR on this PMU | |
737 | */ | |
738 | if (!x86_pmu.lbr_nr) | |
739 | return -EOPNOTSUPP; | |
740 | ||
741 | /* | |
3e702ff6 | 742 | * setup SW LBR filter |
60ce0fbd | 743 | */ |
e9d7f7cd YZ |
744 | ret = intel_pmu_setup_sw_lbr_filter(event); |
745 | if (ret) | |
746 | return ret; | |
3e702ff6 SE |
747 | |
748 | /* | |
749 | * setup HW LBR filter, if any | |
750 | */ | |
751 | if (x86_pmu.lbr_sel_map) | |
752 | ret = intel_pmu_setup_hw_lbr_filter(event); | |
753 | ||
754 | return ret; | |
755 | } | |
756 | ||
757 | /* | |
758 | * return the type of control flow change at address "from" | |
6a6256f9 | 759 | * instruction is not necessarily a branch (in case of interrupt). |
3e702ff6 SE |
760 | * |
761 | * The branch type returned also includes the priv level of the | |
762 | * target of the control flow change (X86_BR_USER, X86_BR_KERNEL). | |
763 | * | |
764 | * If a branch type is unknown OR the instruction cannot be | |
765 | * decoded (e.g., text page not present), then X86_BR_NONE is | |
766 | * returned. | |
767 | */ | |
135c5612 | 768 | static int branch_type(unsigned long from, unsigned long to, int abort) |
3e702ff6 SE |
769 | { |
770 | struct insn insn; | |
771 | void *addr; | |
6ba48ff4 | 772 | int bytes_read, bytes_left; |
3e702ff6 SE |
773 | int ret = X86_BR_NONE; |
774 | int ext, to_plm, from_plm; | |
775 | u8 buf[MAX_INSN_SIZE]; | |
776 | int is64 = 0; | |
777 | ||
778 | to_plm = kernel_ip(to) ? X86_BR_KERNEL : X86_BR_USER; | |
779 | from_plm = kernel_ip(from) ? X86_BR_KERNEL : X86_BR_USER; | |
780 | ||
781 | /* | |
782 | * maybe zero if lbr did not fill up after a reset by the time | |
783 | * we get a PMU interrupt | |
784 | */ | |
785 | if (from == 0 || to == 0) | |
786 | return X86_BR_NONE; | |
787 | ||
135c5612 AK |
788 | if (abort) |
789 | return X86_BR_ABORT | to_plm; | |
790 | ||
3e702ff6 SE |
791 | if (from_plm == X86_BR_USER) { |
792 | /* | |
793 | * can happen if measuring at the user level only | |
794 | * and we interrupt in a kernel thread, e.g., idle. | |
795 | */ | |
796 | if (!current->mm) | |
797 | return X86_BR_NONE; | |
798 | ||
799 | /* may fail if text not present */ | |
6ba48ff4 DH |
800 | bytes_left = copy_from_user_nmi(buf, (void __user *)from, |
801 | MAX_INSN_SIZE); | |
802 | bytes_read = MAX_INSN_SIZE - bytes_left; | |
803 | if (!bytes_read) | |
3e702ff6 SE |
804 | return X86_BR_NONE; |
805 | ||
806 | addr = buf; | |
6e15eb3b PZ |
807 | } else { |
808 | /* | |
809 | * The LBR logs any address in the IP, even if the IP just | |
810 | * faulted. This means userspace can control the from address. | |
811 | * Ensure we don't blindy read any address by validating it is | |
812 | * a known text address. | |
813 | */ | |
6ba48ff4 | 814 | if (kernel_text_address(from)) { |
6e15eb3b | 815 | addr = (void *)from; |
6ba48ff4 DH |
816 | /* |
817 | * Assume we can get the maximum possible size | |
818 | * when grabbing kernel data. This is not | |
819 | * _strictly_ true since we could possibly be | |
820 | * executing up next to a memory hole, but | |
821 | * it is very unlikely to be a problem. | |
822 | */ | |
823 | bytes_read = MAX_INSN_SIZE; | |
824 | } else { | |
6e15eb3b | 825 | return X86_BR_NONE; |
6ba48ff4 | 826 | } |
6e15eb3b | 827 | } |
3e702ff6 SE |
828 | |
829 | /* | |
830 | * decoder needs to know the ABI especially | |
831 | * on 64-bit systems running 32-bit apps | |
832 | */ | |
833 | #ifdef CONFIG_X86_64 | |
834 | is64 = kernel_ip((unsigned long)addr) || !test_thread_flag(TIF_IA32); | |
835 | #endif | |
6ba48ff4 | 836 | insn_init(&insn, addr, bytes_read, is64); |
3e702ff6 | 837 | insn_get_opcode(&insn); |
6ba48ff4 DH |
838 | if (!insn.opcode.got) |
839 | return X86_BR_ABORT; | |
3e702ff6 SE |
840 | |
841 | switch (insn.opcode.bytes[0]) { | |
842 | case 0xf: | |
843 | switch (insn.opcode.bytes[1]) { | |
844 | case 0x05: /* syscall */ | |
845 | case 0x34: /* sysenter */ | |
846 | ret = X86_BR_SYSCALL; | |
847 | break; | |
848 | case 0x07: /* sysret */ | |
849 | case 0x35: /* sysexit */ | |
850 | ret = X86_BR_SYSRET; | |
851 | break; | |
852 | case 0x80 ... 0x8f: /* conditional */ | |
853 | ret = X86_BR_JCC; | |
854 | break; | |
855 | default: | |
856 | ret = X86_BR_NONE; | |
857 | } | |
858 | break; | |
859 | case 0x70 ... 0x7f: /* conditional */ | |
860 | ret = X86_BR_JCC; | |
861 | break; | |
862 | case 0xc2: /* near ret */ | |
863 | case 0xc3: /* near ret */ | |
864 | case 0xca: /* far ret */ | |
865 | case 0xcb: /* far ret */ | |
866 | ret = X86_BR_RET; | |
867 | break; | |
868 | case 0xcf: /* iret */ | |
869 | ret = X86_BR_IRET; | |
870 | break; | |
871 | case 0xcc ... 0xce: /* int */ | |
872 | ret = X86_BR_INT; | |
873 | break; | |
874 | case 0xe8: /* call near rel */ | |
aa54ae9b YZ |
875 | insn_get_immediate(&insn); |
876 | if (insn.immediate1.value == 0) { | |
877 | /* zero length call */ | |
878 | ret = X86_BR_ZERO_CALL; | |
879 | break; | |
880 | } | |
3e702ff6 SE |
881 | case 0x9a: /* call far absolute */ |
882 | ret = X86_BR_CALL; | |
883 | break; | |
884 | case 0xe0 ... 0xe3: /* loop jmp */ | |
885 | ret = X86_BR_JCC; | |
886 | break; | |
887 | case 0xe9 ... 0xeb: /* jmp */ | |
888 | ret = X86_BR_JMP; | |
889 | break; | |
890 | case 0xff: /* call near absolute, call far absolute ind */ | |
891 | insn_get_modrm(&insn); | |
892 | ext = (insn.modrm.bytes[0] >> 3) & 0x7; | |
893 | switch (ext) { | |
894 | case 2: /* near ind call */ | |
895 | case 3: /* far ind call */ | |
896 | ret = X86_BR_IND_CALL; | |
897 | break; | |
898 | case 4: | |
899 | case 5: | |
7b74cfb2 | 900 | ret = X86_BR_IND_JMP; |
3e702ff6 SE |
901 | break; |
902 | } | |
903 | break; | |
904 | default: | |
905 | ret = X86_BR_NONE; | |
60ce0fbd SE |
906 | } |
907 | /* | |
3e702ff6 SE |
908 | * interrupts, traps, faults (and thus ring transition) may |
909 | * occur on any instructions. Thus, to classify them correctly, | |
910 | * we need to first look at the from and to priv levels. If they | |
911 | * are different and to is in the kernel, then it indicates | |
912 | * a ring transition. If the from instruction is not a ring | |
913 | * transition instr (syscall, systenter, int), then it means | |
914 | * it was a irq, trap or fault. | |
915 | * | |
916 | * we have no way of detecting kernel to kernel faults. | |
917 | */ | |
918 | if (from_plm == X86_BR_USER && to_plm == X86_BR_KERNEL | |
919 | && ret != X86_BR_SYSCALL && ret != X86_BR_INT) | |
920 | ret = X86_BR_IRQ; | |
921 | ||
922 | /* | |
923 | * branch priv level determined by target as | |
924 | * is done by HW when LBR_SELECT is implemented | |
60ce0fbd | 925 | */ |
3e702ff6 SE |
926 | if (ret != X86_BR_NONE) |
927 | ret |= to_plm; | |
60ce0fbd | 928 | |
3e702ff6 SE |
929 | return ret; |
930 | } | |
931 | ||
932 | /* | |
933 | * implement actual branch filter based on user demand. | |
934 | * Hardware may not exactly satisfy that request, thus | |
935 | * we need to inspect opcodes. Mismatched branches are | |
936 | * discarded. Therefore, the number of branches returned | |
937 | * in PERF_SAMPLE_BRANCH_STACK sample may vary. | |
938 | */ | |
939 | static void | |
940 | intel_pmu_lbr_filter(struct cpu_hw_events *cpuc) | |
941 | { | |
942 | u64 from, to; | |
943 | int br_sel = cpuc->br_sel; | |
944 | int i, j, type; | |
945 | bool compress = false; | |
946 | ||
947 | /* if sampling all branches, then nothing to filter */ | |
948 | if ((br_sel & X86_BR_ALL) == X86_BR_ALL) | |
949 | return; | |
950 | ||
951 | for (i = 0; i < cpuc->lbr_stack.nr; i++) { | |
952 | ||
953 | from = cpuc->lbr_entries[i].from; | |
954 | to = cpuc->lbr_entries[i].to; | |
955 | ||
135c5612 AK |
956 | type = branch_type(from, to, cpuc->lbr_entries[i].abort); |
957 | if (type != X86_BR_NONE && (br_sel & X86_BR_ANYTX)) { | |
958 | if (cpuc->lbr_entries[i].in_tx) | |
959 | type |= X86_BR_IN_TX; | |
960 | else | |
961 | type |= X86_BR_NO_TX; | |
962 | } | |
3e702ff6 SE |
963 | |
964 | /* if type does not correspond, then discard */ | |
965 | if (type == X86_BR_NONE || (br_sel & type) != type) { | |
966 | cpuc->lbr_entries[i].from = 0; | |
967 | compress = true; | |
968 | } | |
969 | } | |
970 | ||
971 | if (!compress) | |
972 | return; | |
973 | ||
974 | /* remove all entries with from=0 */ | |
975 | for (i = 0; i < cpuc->lbr_stack.nr; ) { | |
976 | if (!cpuc->lbr_entries[i].from) { | |
977 | j = i; | |
978 | while (++j < cpuc->lbr_stack.nr) | |
979 | cpuc->lbr_entries[j-1] = cpuc->lbr_entries[j]; | |
980 | cpuc->lbr_stack.nr--; | |
981 | if (!cpuc->lbr_entries[i].from) | |
982 | continue; | |
983 | } | |
984 | i++; | |
985 | } | |
60ce0fbd SE |
986 | } |
987 | ||
c5cc2cd9 SE |
988 | /* |
989 | * Map interface branch filters onto LBR filters | |
990 | */ | |
2c44b193 | 991 | static const int nhm_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX_SHIFT] = { |
27ac905b YZ |
992 | [PERF_SAMPLE_BRANCH_ANY_SHIFT] = LBR_ANY, |
993 | [PERF_SAMPLE_BRANCH_USER_SHIFT] = LBR_USER, | |
994 | [PERF_SAMPLE_BRANCH_KERNEL_SHIFT] = LBR_KERNEL, | |
995 | [PERF_SAMPLE_BRANCH_HV_SHIFT] = LBR_IGN, | |
996 | [PERF_SAMPLE_BRANCH_ANY_RETURN_SHIFT] = LBR_RETURN | LBR_REL_JMP | |
997 | | LBR_IND_JMP | LBR_FAR, | |
c5cc2cd9 SE |
998 | /* |
999 | * NHM/WSM erratum: must include REL_JMP+IND_JMP to get CALL branches | |
1000 | */ | |
27ac905b | 1001 | [PERF_SAMPLE_BRANCH_ANY_CALL_SHIFT] = |
c5cc2cd9 SE |
1002 | LBR_REL_CALL | LBR_IND_CALL | LBR_REL_JMP | LBR_IND_JMP | LBR_FAR, |
1003 | /* | |
1004 | * NHM/WSM erratum: must include IND_JMP to capture IND_CALL | |
1005 | */ | |
27ac905b YZ |
1006 | [PERF_SAMPLE_BRANCH_IND_CALL_SHIFT] = LBR_IND_CALL | LBR_IND_JMP, |
1007 | [PERF_SAMPLE_BRANCH_COND_SHIFT] = LBR_JCC, | |
7b74cfb2 | 1008 | [PERF_SAMPLE_BRANCH_IND_JUMP_SHIFT] = LBR_IND_JMP, |
c5cc2cd9 SE |
1009 | }; |
1010 | ||
2c44b193 | 1011 | static const int snb_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX_SHIFT] = { |
27ac905b YZ |
1012 | [PERF_SAMPLE_BRANCH_ANY_SHIFT] = LBR_ANY, |
1013 | [PERF_SAMPLE_BRANCH_USER_SHIFT] = LBR_USER, | |
1014 | [PERF_SAMPLE_BRANCH_KERNEL_SHIFT] = LBR_KERNEL, | |
1015 | [PERF_SAMPLE_BRANCH_HV_SHIFT] = LBR_IGN, | |
1016 | [PERF_SAMPLE_BRANCH_ANY_RETURN_SHIFT] = LBR_RETURN | LBR_FAR, | |
1017 | [PERF_SAMPLE_BRANCH_ANY_CALL_SHIFT] = LBR_REL_CALL | LBR_IND_CALL | |
1018 | | LBR_FAR, | |
1019 | [PERF_SAMPLE_BRANCH_IND_CALL_SHIFT] = LBR_IND_CALL, | |
1020 | [PERF_SAMPLE_BRANCH_COND_SHIFT] = LBR_JCC, | |
7b74cfb2 | 1021 | [PERF_SAMPLE_BRANCH_IND_JUMP_SHIFT] = LBR_IND_JMP, |
d892819f | 1022 | [PERF_SAMPLE_BRANCH_CALL_SHIFT] = LBR_REL_CALL, |
c5cc2cd9 SE |
1023 | }; |
1024 | ||
2c44b193 | 1025 | static const int hsw_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX_SHIFT] = { |
e9d7f7cd YZ |
1026 | [PERF_SAMPLE_BRANCH_ANY_SHIFT] = LBR_ANY, |
1027 | [PERF_SAMPLE_BRANCH_USER_SHIFT] = LBR_USER, | |
1028 | [PERF_SAMPLE_BRANCH_KERNEL_SHIFT] = LBR_KERNEL, | |
1029 | [PERF_SAMPLE_BRANCH_HV_SHIFT] = LBR_IGN, | |
1030 | [PERF_SAMPLE_BRANCH_ANY_RETURN_SHIFT] = LBR_RETURN | LBR_FAR, | |
1031 | [PERF_SAMPLE_BRANCH_ANY_CALL_SHIFT] = LBR_REL_CALL | LBR_IND_CALL | |
1032 | | LBR_FAR, | |
1033 | [PERF_SAMPLE_BRANCH_IND_CALL_SHIFT] = LBR_IND_CALL, | |
1034 | [PERF_SAMPLE_BRANCH_COND_SHIFT] = LBR_JCC, | |
1035 | [PERF_SAMPLE_BRANCH_CALL_STACK_SHIFT] = LBR_REL_CALL | LBR_IND_CALL | |
1036 | | LBR_RETURN | LBR_CALL_STACK, | |
7b74cfb2 | 1037 | [PERF_SAMPLE_BRANCH_IND_JUMP_SHIFT] = LBR_IND_JMP, |
d892819f | 1038 | [PERF_SAMPLE_BRANCH_CALL_SHIFT] = LBR_REL_CALL, |
e9d7f7cd YZ |
1039 | }; |
1040 | ||
c5cc2cd9 | 1041 | /* core */ |
066ce64c | 1042 | void __init intel_pmu_lbr_init_core(void) |
caff2bef | 1043 | { |
caff2bef | 1044 | x86_pmu.lbr_nr = 4; |
225ce539 SE |
1045 | x86_pmu.lbr_tos = MSR_LBR_TOS; |
1046 | x86_pmu.lbr_from = MSR_LBR_CORE_FROM; | |
1047 | x86_pmu.lbr_to = MSR_LBR_CORE_TO; | |
c5cc2cd9 | 1048 | |
3e702ff6 SE |
1049 | /* |
1050 | * SW branch filter usage: | |
1051 | * - compensate for lack of HW filter | |
1052 | */ | |
caff2bef PZ |
1053 | } |
1054 | ||
c5cc2cd9 | 1055 | /* nehalem/westmere */ |
066ce64c | 1056 | void __init intel_pmu_lbr_init_nhm(void) |
caff2bef | 1057 | { |
caff2bef | 1058 | x86_pmu.lbr_nr = 16; |
225ce539 SE |
1059 | x86_pmu.lbr_tos = MSR_LBR_TOS; |
1060 | x86_pmu.lbr_from = MSR_LBR_NHM_FROM; | |
1061 | x86_pmu.lbr_to = MSR_LBR_NHM_TO; | |
c5cc2cd9 SE |
1062 | |
1063 | x86_pmu.lbr_sel_mask = LBR_SEL_MASK; | |
1064 | x86_pmu.lbr_sel_map = nhm_lbr_sel_map; | |
1065 | ||
3e702ff6 SE |
1066 | /* |
1067 | * SW branch filter usage: | |
1068 | * - workaround LBR_SEL errata (see above) | |
1069 | * - support syscall, sysret capture. | |
1070 | * That requires LBR_FAR but that means far | |
1071 | * jmp need to be filtered out | |
1072 | */ | |
caff2bef PZ |
1073 | } |
1074 | ||
c5cc2cd9 | 1075 | /* sandy bridge */ |
066ce64c | 1076 | void __init intel_pmu_lbr_init_snb(void) |
c5cc2cd9 SE |
1077 | { |
1078 | x86_pmu.lbr_nr = 16; | |
1079 | x86_pmu.lbr_tos = MSR_LBR_TOS; | |
1080 | x86_pmu.lbr_from = MSR_LBR_NHM_FROM; | |
1081 | x86_pmu.lbr_to = MSR_LBR_NHM_TO; | |
1082 | ||
1083 | x86_pmu.lbr_sel_mask = LBR_SEL_MASK; | |
1084 | x86_pmu.lbr_sel_map = snb_lbr_sel_map; | |
1085 | ||
3e702ff6 SE |
1086 | /* |
1087 | * SW branch filter usage: | |
1088 | * - support syscall, sysret capture. | |
1089 | * That requires LBR_FAR but that means far | |
1090 | * jmp need to be filtered out | |
1091 | */ | |
c5cc2cd9 SE |
1092 | } |
1093 | ||
e9d7f7cd YZ |
1094 | /* haswell */ |
1095 | void intel_pmu_lbr_init_hsw(void) | |
1096 | { | |
1097 | x86_pmu.lbr_nr = 16; | |
1098 | x86_pmu.lbr_tos = MSR_LBR_TOS; | |
1099 | x86_pmu.lbr_from = MSR_LBR_NHM_FROM; | |
1100 | x86_pmu.lbr_to = MSR_LBR_NHM_TO; | |
1101 | ||
1102 | x86_pmu.lbr_sel_mask = LBR_SEL_MASK; | |
1103 | x86_pmu.lbr_sel_map = hsw_lbr_sel_map; | |
19fc9ddd DCC |
1104 | |
1105 | if (lbr_from_signext_quirk_needed()) | |
1106 | static_branch_enable(&lbr_from_quirk_key); | |
e9d7f7cd YZ |
1107 | } |
1108 | ||
9a92e16f AK |
1109 | /* skylake */ |
1110 | __init void intel_pmu_lbr_init_skl(void) | |
1111 | { | |
1112 | x86_pmu.lbr_nr = 32; | |
1113 | x86_pmu.lbr_tos = MSR_LBR_TOS; | |
1114 | x86_pmu.lbr_from = MSR_LBR_NHM_FROM; | |
1115 | x86_pmu.lbr_to = MSR_LBR_NHM_TO; | |
1116 | ||
1117 | x86_pmu.lbr_sel_mask = LBR_SEL_MASK; | |
1118 | x86_pmu.lbr_sel_map = hsw_lbr_sel_map; | |
1119 | ||
1120 | /* | |
1121 | * SW branch filter usage: | |
1122 | * - support syscall, sysret capture. | |
1123 | * That requires LBR_FAR but that means far | |
1124 | * jmp need to be filtered out | |
1125 | */ | |
9a92e16f AK |
1126 | } |
1127 | ||
c5cc2cd9 | 1128 | /* atom */ |
066ce64c | 1129 | void __init intel_pmu_lbr_init_atom(void) |
caff2bef | 1130 | { |
88c9a65e SE |
1131 | /* |
1132 | * only models starting at stepping 10 seems | |
1133 | * to have an operational LBR which can freeze | |
1134 | * on PMU interrupt | |
1135 | */ | |
3ec18cd8 SE |
1136 | if (boot_cpu_data.x86_model == 28 |
1137 | && boot_cpu_data.x86_mask < 10) { | |
88c9a65e SE |
1138 | pr_cont("LBR disabled due to erratum"); |
1139 | return; | |
1140 | } | |
1141 | ||
caff2bef | 1142 | x86_pmu.lbr_nr = 8; |
225ce539 SE |
1143 | x86_pmu.lbr_tos = MSR_LBR_TOS; |
1144 | x86_pmu.lbr_from = MSR_LBR_CORE_FROM; | |
1145 | x86_pmu.lbr_to = MSR_LBR_CORE_TO; | |
c5cc2cd9 | 1146 | |
3e702ff6 SE |
1147 | /* |
1148 | * SW branch filter usage: | |
1149 | * - compensate for lack of HW filter | |
1150 | */ | |
caff2bef | 1151 | } |
1e7b9390 | 1152 | |
f21d5adc KL |
1153 | /* slm */ |
1154 | void __init intel_pmu_lbr_init_slm(void) | |
1155 | { | |
1156 | x86_pmu.lbr_nr = 8; | |
1157 | x86_pmu.lbr_tos = MSR_LBR_TOS; | |
1158 | x86_pmu.lbr_from = MSR_LBR_CORE_FROM; | |
1159 | x86_pmu.lbr_to = MSR_LBR_CORE_TO; | |
1160 | ||
1161 | x86_pmu.lbr_sel_mask = LBR_SEL_MASK; | |
1162 | x86_pmu.lbr_sel_map = nhm_lbr_sel_map; | |
1163 | ||
1164 | /* | |
1165 | * SW branch filter usage: | |
1166 | * - compensate for lack of HW filter | |
1167 | */ | |
1168 | pr_cont("8-deep LBR, "); | |
1169 | } | |
1170 | ||
1e7b9390 HC |
1171 | /* Knights Landing */ |
1172 | void intel_pmu_lbr_init_knl(void) | |
1173 | { | |
1174 | x86_pmu.lbr_nr = 8; | |
1175 | x86_pmu.lbr_tos = MSR_LBR_TOS; | |
1176 | x86_pmu.lbr_from = MSR_LBR_NHM_FROM; | |
1177 | x86_pmu.lbr_to = MSR_LBR_NHM_TO; | |
1178 | ||
1179 | x86_pmu.lbr_sel_mask = LBR_SEL_MASK; | |
1180 | x86_pmu.lbr_sel_map = snb_lbr_sel_map; | |
1e7b9390 | 1181 | } |