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-rw-r--r--arch/x86/oprofile/op_model_amd.c543
1 files changed, 543 insertions, 0 deletions
diff --git a/arch/x86/oprofile/op_model_amd.c b/arch/x86/oprofile/op_model_amd.c
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1/*
2 * @file op_model_amd.c
3 * athlon / K7 / K8 / Family 10h model-specific MSR operations
4 *
5 * @remark Copyright 2002-2008 OProfile authors
6 * @remark Read the file COPYING
7 *
8 * @author John Levon
9 * @author Philippe Elie
10 * @author Graydon Hoare
11 * @author Robert Richter <robert.richter@amd.com>
12 * @author Barry Kasindorf
13*/
14
15#include <linux/oprofile.h>
16#include <linux/device.h>
17#include <linux/pci.h>
18
19#include <asm/ptrace.h>
20#include <asm/msr.h>
21#include <asm/nmi.h>
22
23#include "op_x86_model.h"
24#include "op_counter.h"
25
26#define NUM_COUNTERS 4
27#define NUM_CONTROLS 4
28
29#define CTR_IS_RESERVED(msrs, c) (msrs->counters[(c)].addr ? 1 : 0)
30#define CTR_READ(l, h, msrs, c) do {rdmsr(msrs->counters[(c)].addr, (l), (h)); } while (0)
31#define CTR_WRITE(l, msrs, c) do {wrmsr(msrs->counters[(c)].addr, -(unsigned int)(l), -1); } while (0)
32#define CTR_OVERFLOWED(n) (!((n) & (1U<<31)))
33
34#define CTRL_IS_RESERVED(msrs, c) (msrs->controls[(c)].addr ? 1 : 0)
35#define CTRL_READ(l, h, msrs, c) do {rdmsr(msrs->controls[(c)].addr, (l), (h)); } while (0)
36#define CTRL_WRITE(l, h, msrs, c) do {wrmsr(msrs->controls[(c)].addr, (l), (h)); } while (0)
37#define CTRL_SET_ACTIVE(n) (n |= (1<<22))
38#define CTRL_SET_INACTIVE(n) (n &= ~(1<<22))
39#define CTRL_CLEAR_LO(x) (x &= (1<<21))
40#define CTRL_CLEAR_HI(x) (x &= 0xfffffcf0)
41#define CTRL_SET_ENABLE(val) (val |= 1<<20)
42#define CTRL_SET_USR(val, u) (val |= ((u & 1) << 16))
43#define CTRL_SET_KERN(val, k) (val |= ((k & 1) << 17))
44#define CTRL_SET_UM(val, m) (val |= (m << 8))
45#define CTRL_SET_EVENT_LOW(val, e) (val |= (e & 0xff))
46#define CTRL_SET_EVENT_HIGH(val, e) (val |= ((e >> 8) & 0xf))
47#define CTRL_SET_HOST_ONLY(val, h) (val |= ((h & 1) << 9))
48#define CTRL_SET_GUEST_ONLY(val, h) (val |= ((h & 1) << 8))
49
50static unsigned long reset_value[NUM_COUNTERS];
51
52#ifdef CONFIG_OPROFILE_IBS
53
54/* IbsFetchCtl bits/masks */
55#define IBS_FETCH_HIGH_VALID_BIT (1UL << 17) /* bit 49 */
56#define IBS_FETCH_HIGH_ENABLE (1UL << 16) /* bit 48 */
57#define IBS_FETCH_LOW_MAX_CNT_MASK 0x0000FFFFUL /* MaxCnt mask */
58
59/*IbsOpCtl bits */
60#define IBS_OP_LOW_VALID_BIT (1ULL<<18) /* bit 18 */
61#define IBS_OP_LOW_ENABLE (1ULL<<17) /* bit 17 */
62
63/* Codes used in cpu_buffer.c */
64/* This produces duplicate code, need to be fixed */
65#define IBS_FETCH_BEGIN 3
66#define IBS_OP_BEGIN 4
67
68/* The function interface needs to be fixed, something like add
69 data. Should then be added to linux/oprofile.h. */
70extern void oprofile_add_ibs_sample(struct pt_regs *const regs,
71 unsigned int * const ibs_sample, u8 code);
72
73struct ibs_fetch_sample {
74 /* MSRC001_1031 IBS Fetch Linear Address Register */
75 unsigned int ibs_fetch_lin_addr_low;
76 unsigned int ibs_fetch_lin_addr_high;
77 /* MSRC001_1030 IBS Fetch Control Register */
78 unsigned int ibs_fetch_ctl_low;
79 unsigned int ibs_fetch_ctl_high;
80 /* MSRC001_1032 IBS Fetch Physical Address Register */
81 unsigned int ibs_fetch_phys_addr_low;
82 unsigned int ibs_fetch_phys_addr_high;
83};
84
85struct ibs_op_sample {
86 /* MSRC001_1034 IBS Op Logical Address Register (IbsRIP) */
87 unsigned int ibs_op_rip_low;
88 unsigned int ibs_op_rip_high;
89 /* MSRC001_1035 IBS Op Data Register */
90 unsigned int ibs_op_data1_low;
91 unsigned int ibs_op_data1_high;
92 /* MSRC001_1036 IBS Op Data 2 Register */
93 unsigned int ibs_op_data2_low;
94 unsigned int ibs_op_data2_high;
95 /* MSRC001_1037 IBS Op Data 3 Register */
96 unsigned int ibs_op_data3_low;
97 unsigned int ibs_op_data3_high;
98 /* MSRC001_1038 IBS DC Linear Address Register (IbsDcLinAd) */
99 unsigned int ibs_dc_linear_low;
100 unsigned int ibs_dc_linear_high;
101 /* MSRC001_1039 IBS DC Physical Address Register (IbsDcPhysAd) */
102 unsigned int ibs_dc_phys_low;
103 unsigned int ibs_dc_phys_high;
104};
105
106/*
107 * unitialize the APIC for the IBS interrupts if needed on AMD Family10h+
108*/
109static void clear_ibs_nmi(void);
110
111static int ibs_allowed; /* AMD Family10h and later */
112
113struct op_ibs_config {
114 unsigned long op_enabled;
115 unsigned long fetch_enabled;
116 unsigned long max_cnt_fetch;
117 unsigned long max_cnt_op;
118 unsigned long rand_en;
119 unsigned long dispatched_ops;
120};
121
122static struct op_ibs_config ibs_config;
123
124#endif
125
126/* functions for op_amd_spec */
127
128static void op_amd_fill_in_addresses(struct op_msrs * const msrs)
129{
130 int i;
131
132 for (i = 0; i < NUM_COUNTERS; i++) {
133 if (reserve_perfctr_nmi(MSR_K7_PERFCTR0 + i))
134 msrs->counters[i].addr = MSR_K7_PERFCTR0 + i;
135 else
136 msrs->counters[i].addr = 0;
137 }
138
139 for (i = 0; i < NUM_CONTROLS; i++) {
140 if (reserve_evntsel_nmi(MSR_K7_EVNTSEL0 + i))
141 msrs->controls[i].addr = MSR_K7_EVNTSEL0 + i;
142 else
143 msrs->controls[i].addr = 0;
144 }
145}
146
147
148static void op_amd_setup_ctrs(struct op_msrs const * const msrs)
149{
150 unsigned int low, high;
151 int i;
152
153 /* clear all counters */
154 for (i = 0 ; i < NUM_CONTROLS; ++i) {
155 if (unlikely(!CTRL_IS_RESERVED(msrs, i)))
156 continue;
157 CTRL_READ(low, high, msrs, i);
158 CTRL_CLEAR_LO(low);
159 CTRL_CLEAR_HI(high);
160 CTRL_WRITE(low, high, msrs, i);
161 }
162
163 /* avoid a false detection of ctr overflows in NMI handler */
164 for (i = 0; i < NUM_COUNTERS; ++i) {
165 if (unlikely(!CTR_IS_RESERVED(msrs, i)))
166 continue;
167 CTR_WRITE(1, msrs, i);
168 }
169
170 /* enable active counters */
171 for (i = 0; i < NUM_COUNTERS; ++i) {
172 if ((counter_config[i].enabled) && (CTR_IS_RESERVED(msrs, i))) {
173 reset_value[i] = counter_config[i].count;
174
175 CTR_WRITE(counter_config[i].count, msrs, i);
176
177 CTRL_READ(low, high, msrs, i);
178 CTRL_CLEAR_LO(low);
179 CTRL_CLEAR_HI(high);
180 CTRL_SET_ENABLE(low);
181 CTRL_SET_USR(low, counter_config[i].user);
182 CTRL_SET_KERN(low, counter_config[i].kernel);
183 CTRL_SET_UM(low, counter_config[i].unit_mask);
184 CTRL_SET_EVENT_LOW(low, counter_config[i].event);
185 CTRL_SET_EVENT_HIGH(high, counter_config[i].event);
186 CTRL_SET_HOST_ONLY(high, 0);
187 CTRL_SET_GUEST_ONLY(high, 0);
188
189 CTRL_WRITE(low, high, msrs, i);
190 } else {
191 reset_value[i] = 0;
192 }
193 }
194}
195
196#ifdef CONFIG_OPROFILE_IBS
197
198static inline int
199op_amd_handle_ibs(struct pt_regs * const regs,
200 struct op_msrs const * const msrs)
201{
202 unsigned int low, high;
203 struct ibs_fetch_sample ibs_fetch;
204 struct ibs_op_sample ibs_op;
205
206 if (!ibs_allowed)
207 return 1;
208
209 if (ibs_config.fetch_enabled) {
210 rdmsr(MSR_AMD64_IBSFETCHCTL, low, high);
211 if (high & IBS_FETCH_HIGH_VALID_BIT) {
212 ibs_fetch.ibs_fetch_ctl_high = high;
213 ibs_fetch.ibs_fetch_ctl_low = low;
214 rdmsr(MSR_AMD64_IBSFETCHLINAD, low, high);
215 ibs_fetch.ibs_fetch_lin_addr_high = high;
216 ibs_fetch.ibs_fetch_lin_addr_low = low;
217 rdmsr(MSR_AMD64_IBSFETCHPHYSAD, low, high);
218 ibs_fetch.ibs_fetch_phys_addr_high = high;
219 ibs_fetch.ibs_fetch_phys_addr_low = low;
220
221 oprofile_add_ibs_sample(regs,
222 (unsigned int *)&ibs_fetch,
223 IBS_FETCH_BEGIN);
224
225 /*reenable the IRQ */
226 rdmsr(MSR_AMD64_IBSFETCHCTL, low, high);
227 high &= ~IBS_FETCH_HIGH_VALID_BIT;
228 high |= IBS_FETCH_HIGH_ENABLE;
229 low &= IBS_FETCH_LOW_MAX_CNT_MASK;
230 wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
231 }
232 }
233
234 if (ibs_config.op_enabled) {
235 rdmsr(MSR_AMD64_IBSOPCTL, low, high);
236 if (low & IBS_OP_LOW_VALID_BIT) {
237 rdmsr(MSR_AMD64_IBSOPRIP, low, high);
238 ibs_op.ibs_op_rip_low = low;
239 ibs_op.ibs_op_rip_high = high;
240 rdmsr(MSR_AMD64_IBSOPDATA, low, high);
241 ibs_op.ibs_op_data1_low = low;
242 ibs_op.ibs_op_data1_high = high;
243 rdmsr(MSR_AMD64_IBSOPDATA2, low, high);
244 ibs_op.ibs_op_data2_low = low;
245 ibs_op.ibs_op_data2_high = high;
246 rdmsr(MSR_AMD64_IBSOPDATA3, low, high);
247 ibs_op.ibs_op_data3_low = low;
248 ibs_op.ibs_op_data3_high = high;
249 rdmsr(MSR_AMD64_IBSDCLINAD, low, high);
250 ibs_op.ibs_dc_linear_low = low;
251 ibs_op.ibs_dc_linear_high = high;
252 rdmsr(MSR_AMD64_IBSDCPHYSAD, low, high);
253 ibs_op.ibs_dc_phys_low = low;
254 ibs_op.ibs_dc_phys_high = high;
255
256 /* reenable the IRQ */
257 oprofile_add_ibs_sample(regs,
258 (unsigned int *)&ibs_op,
259 IBS_OP_BEGIN);
260 rdmsr(MSR_AMD64_IBSOPCTL, low, high);
261 high = 0;
262 low &= ~IBS_OP_LOW_VALID_BIT;
263 low |= IBS_OP_LOW_ENABLE;
264 wrmsr(MSR_AMD64_IBSOPCTL, low, high);
265 }
266 }
267
268 return 1;
269}
270
271#endif
272
273static int op_amd_check_ctrs(struct pt_regs * const regs,
274 struct op_msrs const * const msrs)
275{
276 unsigned int low, high;
277 int i;
278
279 for (i = 0 ; i < NUM_COUNTERS; ++i) {
280 if (!reset_value[i])
281 continue;
282 CTR_READ(low, high, msrs, i);
283 if (CTR_OVERFLOWED(low)) {
284 oprofile_add_sample(regs, i);
285 CTR_WRITE(reset_value[i], msrs, i);
286 }
287 }
288
289#ifdef CONFIG_OPROFILE_IBS
290 op_amd_handle_ibs(regs, msrs);
291#endif
292
293 /* See op_model_ppro.c */
294 return 1;
295}
296
297static void op_amd_start(struct op_msrs const * const msrs)
298{
299 unsigned int low, high;
300 int i;
301 for (i = 0 ; i < NUM_COUNTERS ; ++i) {
302 if (reset_value[i]) {
303 CTRL_READ(low, high, msrs, i);
304 CTRL_SET_ACTIVE(low);
305 CTRL_WRITE(low, high, msrs, i);
306 }
307 }
308
309#ifdef CONFIG_OPROFILE_IBS
310 if (ibs_allowed && ibs_config.fetch_enabled) {
311 low = (ibs_config.max_cnt_fetch >> 4) & 0xFFFF;
312 high = IBS_FETCH_HIGH_ENABLE;
313 wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
314 }
315
316 if (ibs_allowed && ibs_config.op_enabled) {
317 low = ((ibs_config.max_cnt_op >> 4) & 0xFFFF) + IBS_OP_LOW_ENABLE;
318 high = 0;
319 wrmsr(MSR_AMD64_IBSOPCTL, low, high);
320 }
321#endif
322}
323
324
325static void op_amd_stop(struct op_msrs const * const msrs)
326{
327 unsigned int low, high;
328 int i;
329
330 /* Subtle: stop on all counters to avoid race with
331 * setting our pm callback */
332 for (i = 0 ; i < NUM_COUNTERS ; ++i) {
333 if (!reset_value[i])
334 continue;
335 CTRL_READ(low, high, msrs, i);
336 CTRL_SET_INACTIVE(low);
337 CTRL_WRITE(low, high, msrs, i);
338 }
339
340#ifdef CONFIG_OPROFILE_IBS
341 if (ibs_allowed && ibs_config.fetch_enabled) {
342 low = 0; /* clear max count and enable */
343 high = 0;
344 wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
345 }
346
347 if (ibs_allowed && ibs_config.op_enabled) {
348 low = 0; /* clear max count and enable */
349 high = 0;
350 wrmsr(MSR_AMD64_IBSOPCTL, low, high);
351 }
352#endif
353}
354
355static void op_amd_shutdown(struct op_msrs const * const msrs)
356{
357 int i;
358
359 for (i = 0 ; i < NUM_COUNTERS ; ++i) {
360 if (CTR_IS_RESERVED(msrs, i))
361 release_perfctr_nmi(MSR_K7_PERFCTR0 + i);
362 }
363 for (i = 0 ; i < NUM_CONTROLS ; ++i) {
364 if (CTRL_IS_RESERVED(msrs, i))
365 release_evntsel_nmi(MSR_K7_EVNTSEL0 + i);
366 }
367}
368
369#ifndef CONFIG_OPROFILE_IBS
370
371/* no IBS support */
372
373static int op_amd_init(struct oprofile_operations *ops)
374{
375 return 0;
376}
377
378static void op_amd_exit(void) {}
379
380#else
381
382static u8 ibs_eilvt_off;
383
384static inline void apic_init_ibs_nmi_per_cpu(void *arg)
385{
386 ibs_eilvt_off = setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_NMI, 0);
387}
388
389static inline void apic_clear_ibs_nmi_per_cpu(void *arg)
390{
391 setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_FIX, 1);
392}
393
394static int pfm_amd64_setup_eilvt(void)
395{
396#define IBSCTL_LVTOFFSETVAL (1 << 8)
397#define IBSCTL 0x1cc
398 struct pci_dev *cpu_cfg;
399 int nodes;
400 u32 value = 0;
401
402 /* per CPU setup */
403 on_each_cpu(apic_init_ibs_nmi_per_cpu, NULL, 1);
404
405 nodes = 0;
406 cpu_cfg = NULL;
407 do {
408 cpu_cfg = pci_get_device(PCI_VENDOR_ID_AMD,
409 PCI_DEVICE_ID_AMD_10H_NB_MISC,
410 cpu_cfg);
411 if (!cpu_cfg)
412 break;
413 ++nodes;
414 pci_write_config_dword(cpu_cfg, IBSCTL, ibs_eilvt_off
415 | IBSCTL_LVTOFFSETVAL);
416 pci_read_config_dword(cpu_cfg, IBSCTL, &value);
417 if (value != (ibs_eilvt_off | IBSCTL_LVTOFFSETVAL)) {
418 printk(KERN_DEBUG "Failed to setup IBS LVT offset, "
419 "IBSCTL = 0x%08x", value);
420 return 1;
421 }
422 } while (1);
423
424 if (!nodes) {
425 printk(KERN_DEBUG "No CPU node configured for IBS");
426 return 1;
427 }
428
429#ifdef CONFIG_NUMA
430 /* Sanity check */
431 /* Works only for 64bit with proper numa implementation. */
432 if (nodes != num_possible_nodes()) {
433 printk(KERN_DEBUG "Failed to setup CPU node(s) for IBS, "
434 "found: %d, expected %d",
435 nodes, num_possible_nodes());
436 return 1;
437 }
438#endif
439 return 0;
440}
441
442/*
443 * initialize the APIC for the IBS interrupts
444 * if available (AMD Family10h rev B0 and later)
445 */
446static void setup_ibs(void)
447{
448 ibs_allowed = boot_cpu_has(X86_FEATURE_IBS);
449
450 if (!ibs_allowed)
451 return;
452
453 if (pfm_amd64_setup_eilvt()) {
454 ibs_allowed = 0;
455 return;
456 }
457
458 printk(KERN_INFO "oprofile: AMD IBS detected\n");
459}
460
461
462/*
463 * unitialize the APIC for the IBS interrupts if needed on AMD Family10h
464 * rev B0 and later */
465static void clear_ibs_nmi(void)
466{
467 if (ibs_allowed)
468 on_each_cpu(apic_clear_ibs_nmi_per_cpu, NULL, 1);
469}
470
471static int (*create_arch_files)(struct super_block * sb, struct dentry * root);
472
473static int setup_ibs_files(struct super_block * sb, struct dentry * root)
474{
475 char buf[12];
476 struct dentry *dir;
477 int ret = 0;
478
479 /* architecture specific files */
480 if (create_arch_files)
481 ret = create_arch_files(sb, root);
482
483 if (ret)
484 return ret;
485
486 if (!ibs_allowed)
487 return ret;
488
489 /* model specific files */
490
491 /* setup some reasonable defaults */
492 ibs_config.max_cnt_fetch = 250000;
493 ibs_config.fetch_enabled = 0;
494 ibs_config.max_cnt_op = 250000;
495 ibs_config.op_enabled = 0;
496 ibs_config.dispatched_ops = 1;
497 snprintf(buf, sizeof(buf), "ibs_fetch");
498 dir = oprofilefs_mkdir(sb, root, buf);
499 oprofilefs_create_ulong(sb, dir, "rand_enable",
500 &ibs_config.rand_en);
501 oprofilefs_create_ulong(sb, dir, "enable",
502 &ibs_config.fetch_enabled);
503 oprofilefs_create_ulong(sb, dir, "max_count",
504 &ibs_config.max_cnt_fetch);
505 snprintf(buf, sizeof(buf), "ibs_uops");
506 dir = oprofilefs_mkdir(sb, root, buf);
507 oprofilefs_create_ulong(sb, dir, "enable",
508 &ibs_config.op_enabled);
509 oprofilefs_create_ulong(sb, dir, "max_count",
510 &ibs_config.max_cnt_op);
511 oprofilefs_create_ulong(sb, dir, "dispatched_ops",
512 &ibs_config.dispatched_ops);
513
514 return 0;
515}
516
517static int op_amd_init(struct oprofile_operations *ops)
518{
519 setup_ibs();
520 create_arch_files = ops->create_files;
521 ops->create_files = setup_ibs_files;
522 return 0;
523}
524
525static void op_amd_exit(void)
526{
527 clear_ibs_nmi();
528}
529
530#endif
531
532struct op_x86_model_spec const op_amd_spec = {
533 .init = op_amd_init,
534 .exit = op_amd_exit,
535 .num_counters = NUM_COUNTERS,
536 .num_controls = NUM_CONTROLS,
537 .fill_in_addresses = &op_amd_fill_in_addresses,
538 .setup_ctrs = &op_amd_setup_ctrs,
539 .check_ctrs = &op_amd_check_ctrs,
540 .start = &op_amd_start,
541 .stop = &op_amd_stop,
542 .shutdown = &op_amd_shutdown
543};
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-18 06:46:57 -0500