3 * athlon / K7 / K8 / Family 10h model-specific MSR operations
5 * @remark Copyright 2002-2009 OProfile authors
6 * @remark Read the file COPYING
9 * @author Philippe Elie
10 * @author Graydon Hoare
11 * @author Robert Richter <robert.richter@amd.com>
12 * @author Barry Kasindorf <barry.kasindorf@amd.com>
13 * @author Jason Yeh <jason.yeh@amd.com>
14 * @author Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
17 #include <linux/oprofile.h>
18 #include <linux/device.h>
19 #include <linux/pci.h>
20 #include <linux/percpu.h>
22 #include <asm/ptrace.h>
26 #include <asm/processor.h>
27 #include <asm/cpufeature.h>
29 #include "op_x86_model.h"
30 #include "op_counter.h"
32 #define NUM_COUNTERS 4
33 #define NUM_CONTROLS 4
34 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
35 #define NUM_VIRT_COUNTERS 32
36 #define NUM_VIRT_CONTROLS 32
38 #define NUM_VIRT_COUNTERS NUM_COUNTERS
39 #define NUM_VIRT_CONTROLS NUM_CONTROLS
42 #define OP_EVENT_MASK 0x0FFF
43 #define OP_CTR_OVERFLOW (1ULL<<31)
45 #define MSR_AMD_EVENTSEL_RESERVED ((0xFFFFFCF0ULL<<32)|(1ULL<<21))
47 static unsigned long reset_value[NUM_VIRT_COUNTERS];
49 /* IbsFetchCtl bits/masks */
50 #define IBS_FETCH_RAND_EN (1ULL<<57)
51 #define IBS_FETCH_VAL (1ULL<<49)
52 #define IBS_FETCH_ENABLE (1ULL<<48)
53 #define IBS_FETCH_CNT_MASK 0xFFFF0000ULL
56 #define IBS_OP_CNT_CTL (1ULL<<19)
57 #define IBS_OP_VAL (1ULL<<18)
58 #define IBS_OP_ENABLE (1ULL<<17)
60 #define IBS_FETCH_SIZE 6
61 #define IBS_OP_SIZE 12
65 struct op_ibs_config {
66 unsigned long op_enabled;
67 unsigned long fetch_enabled;
68 unsigned long max_cnt_fetch;
69 unsigned long max_cnt_op;
70 unsigned long rand_en;
71 unsigned long dispatched_ops;
74 static struct op_ibs_config ibs_config;
75 static u64 ibs_op_ctl;
78 * IBS cpuid feature detection
81 #define IBS_CPUID_FEATURES 0x8000001b
84 * Same bit mask as for IBS cpuid feature flags (Fn8000_001B_EAX), but
85 * bit 0 is used to indicate the existence of IBS.
87 #define IBS_CAPS_AVAIL (1LL<<0)
88 #define IBS_CAPS_RDWROPCNT (1LL<<3)
89 #define IBS_CAPS_OPCNT (1LL<<4)
92 * IBS randomization macros
94 #define IBS_RANDOM_BITS 12
95 #define IBS_RANDOM_MASK ((1ULL << IBS_RANDOM_BITS) - 1)
96 #define IBS_RANDOM_MAXCNT_OFFSET (1ULL << (IBS_RANDOM_BITS - 5))
98 static u32 get_ibs_caps(void)
101 unsigned int max_level;
103 if (!boot_cpu_has(X86_FEATURE_IBS))
106 /* check IBS cpuid feature flags */
107 max_level = cpuid_eax(0x80000000);
108 if (max_level < IBS_CPUID_FEATURES)
109 return IBS_CAPS_AVAIL;
111 ibs_caps = cpuid_eax(IBS_CPUID_FEATURES);
112 if (!(ibs_caps & IBS_CAPS_AVAIL))
113 /* cpuid flags not valid */
114 return IBS_CAPS_AVAIL;
119 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
121 static void op_mux_switch_ctrl(struct op_x86_model_spec const *model,
122 struct op_msrs const * const msrs)
127 /* enable active counters */
128 for (i = 0; i < NUM_COUNTERS; ++i) {
129 int virt = op_x86_phys_to_virt(i);
130 if (!reset_value[virt])
132 rdmsrl(msrs->controls[i].addr, val);
133 val &= model->reserved;
134 val |= op_x86_get_ctrl(model, &counter_config[virt]);
135 wrmsrl(msrs->controls[i].addr, val);
141 /* functions for op_amd_spec */
143 static void op_amd_fill_in_addresses(struct op_msrs * const msrs)
147 for (i = 0; i < NUM_COUNTERS; i++) {
148 if (reserve_perfctr_nmi(MSR_K7_PERFCTR0 + i))
149 msrs->counters[i].addr = MSR_K7_PERFCTR0 + i;
152 for (i = 0; i < NUM_CONTROLS; i++) {
153 if (reserve_evntsel_nmi(MSR_K7_EVNTSEL0 + i))
154 msrs->controls[i].addr = MSR_K7_EVNTSEL0 + i;
158 static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,
159 struct op_msrs const * const msrs)
164 /* setup reset_value */
165 for (i = 0; i < NUM_VIRT_COUNTERS; ++i) {
166 if (counter_config[i].enabled
167 && msrs->counters[op_x86_virt_to_phys(i)].addr)
168 reset_value[i] = counter_config[i].count;
173 /* clear all counters */
174 for (i = 0; i < NUM_CONTROLS; ++i) {
175 if (unlikely(!msrs->controls[i].addr)) {
176 if (counter_config[i].enabled && !smp_processor_id())
178 * counter is reserved, this is on all
179 * cpus, so report only for cpu #0
181 op_x86_warn_reserved(i);
184 rdmsrl(msrs->controls[i].addr, val);
185 if (val & ARCH_PERFMON_EVENTSEL0_ENABLE)
186 op_x86_warn_in_use(i);
187 val &= model->reserved;
188 wrmsrl(msrs->controls[i].addr, val);
191 /* avoid a false detection of ctr overflows in NMI handler */
192 for (i = 0; i < NUM_COUNTERS; ++i) {
193 if (unlikely(!msrs->counters[i].addr))
195 wrmsrl(msrs->counters[i].addr, -1LL);
198 /* enable active counters */
199 for (i = 0; i < NUM_COUNTERS; ++i) {
200 int virt = op_x86_phys_to_virt(i);
201 if (!reset_value[virt])
204 /* setup counter registers */
205 wrmsrl(msrs->counters[i].addr, -(u64)reset_value[virt]);
207 /* setup control registers */
208 rdmsrl(msrs->controls[i].addr, val);
209 val &= model->reserved;
210 val |= op_x86_get_ctrl(model, &counter_config[virt]);
211 wrmsrl(msrs->controls[i].addr, val);
216 * 16-bit Linear Feedback Shift Register (LFSR)
219 * Feedback polynomial = X + X + X + X + 1
221 static unsigned int lfsr_random(void)
223 static unsigned int lfsr_value = 0xF00D;
226 /* Compute next bit to shift in */
227 bit = ((lfsr_value >> 0) ^
230 (lfsr_value >> 5)) & 0x0001;
232 /* Advance to next register value */
233 lfsr_value = (lfsr_value >> 1) | (bit << 15);
239 * IBS software randomization
241 * The IBS periodic op counter is randomized in software. The lower 12
242 * bits of the 20 bit counter are randomized. IbsOpCurCnt is
243 * initialized with a 12 bit random value.
245 static inline u64 op_amd_randomize_ibs_op(u64 val)
247 unsigned int random = lfsr_random();
249 if (!(ibs_caps & IBS_CAPS_RDWROPCNT))
251 * Work around if the hw can not write to IbsOpCurCnt
253 * Randomize the lower 8 bits of the 16 bit
254 * IbsOpMaxCnt [15:0] value in the range of -128 to
255 * +127 by adding/subtracting an offset to the
256 * maximum count (IbsOpMaxCnt).
258 * To avoid over or underflows and protect upper bits
259 * starting at bit 16, the initial value for
260 * IbsOpMaxCnt must fit in the range from 0x0081 to
263 val += (s8)(random >> 4);
265 val |= (u64)(random & IBS_RANDOM_MASK) << 32;
271 op_amd_handle_ibs(struct pt_regs * const regs,
272 struct op_msrs const * const msrs)
275 struct op_entry entry;
280 if (ibs_config.fetch_enabled) {
281 rdmsrl(MSR_AMD64_IBSFETCHCTL, ctl);
282 if (ctl & IBS_FETCH_VAL) {
283 rdmsrl(MSR_AMD64_IBSFETCHLINAD, val);
284 oprofile_write_reserve(&entry, regs, val,
285 IBS_FETCH_CODE, IBS_FETCH_SIZE);
286 oprofile_add_data64(&entry, val);
287 oprofile_add_data64(&entry, ctl);
288 rdmsrl(MSR_AMD64_IBSFETCHPHYSAD, val);
289 oprofile_add_data64(&entry, val);
290 oprofile_write_commit(&entry);
292 /* reenable the IRQ */
293 ctl &= ~(IBS_FETCH_VAL | IBS_FETCH_CNT_MASK);
294 ctl |= IBS_FETCH_ENABLE;
295 wrmsrl(MSR_AMD64_IBSFETCHCTL, ctl);
299 if (ibs_config.op_enabled) {
300 rdmsrl(MSR_AMD64_IBSOPCTL, ctl);
301 if (ctl & IBS_OP_VAL) {
302 rdmsrl(MSR_AMD64_IBSOPRIP, val);
303 oprofile_write_reserve(&entry, regs, val,
304 IBS_OP_CODE, IBS_OP_SIZE);
305 oprofile_add_data64(&entry, val);
306 rdmsrl(MSR_AMD64_IBSOPDATA, val);
307 oprofile_add_data64(&entry, val);
308 rdmsrl(MSR_AMD64_IBSOPDATA2, val);
309 oprofile_add_data64(&entry, val);
310 rdmsrl(MSR_AMD64_IBSOPDATA3, val);
311 oprofile_add_data64(&entry, val);
312 rdmsrl(MSR_AMD64_IBSDCLINAD, val);
313 oprofile_add_data64(&entry, val);
314 rdmsrl(MSR_AMD64_IBSDCPHYSAD, val);
315 oprofile_add_data64(&entry, val);
316 oprofile_write_commit(&entry);
318 /* reenable the IRQ */
319 ctl = op_amd_randomize_ibs_op(ibs_op_ctl);
320 wrmsrl(MSR_AMD64_IBSOPCTL, ctl);
325 static inline void op_amd_start_ibs(void)
332 if (ibs_config.fetch_enabled) {
333 val = (ibs_config.max_cnt_fetch >> 4) & 0xFFFF;
334 val |= ibs_config.rand_en ? IBS_FETCH_RAND_EN : 0;
335 val |= IBS_FETCH_ENABLE;
336 wrmsrl(MSR_AMD64_IBSFETCHCTL, val);
339 if (ibs_config.op_enabled) {
340 ibs_op_ctl = ibs_config.max_cnt_op >> 4;
341 if (!(ibs_caps & IBS_CAPS_RDWROPCNT)) {
343 * IbsOpCurCnt not supported. See
344 * op_amd_randomize_ibs_op() for details.
346 ibs_op_ctl = clamp(ibs_op_ctl, 0x0081ULL, 0xFF80ULL);
349 * The start value is randomized with a
350 * positive offset, we need to compensate it
351 * with the half of the randomized range. Also
354 ibs_op_ctl = min(ibs_op_ctl + IBS_RANDOM_MAXCNT_OFFSET,
357 if (ibs_caps & IBS_CAPS_OPCNT && ibs_config.dispatched_ops)
358 ibs_op_ctl |= IBS_OP_CNT_CTL;
359 ibs_op_ctl |= IBS_OP_ENABLE;
360 val = op_amd_randomize_ibs_op(ibs_op_ctl);
361 wrmsrl(MSR_AMD64_IBSOPCTL, val);
365 static void op_amd_stop_ibs(void)
370 if (ibs_config.fetch_enabled)
371 /* clear max count and enable */
372 wrmsrl(MSR_AMD64_IBSFETCHCTL, 0);
374 if (ibs_config.op_enabled)
375 /* clear max count and enable */
376 wrmsrl(MSR_AMD64_IBSOPCTL, 0);
379 static int op_amd_check_ctrs(struct pt_regs * const regs,
380 struct op_msrs const * const msrs)
385 for (i = 0; i < NUM_COUNTERS; ++i) {
386 int virt = op_x86_phys_to_virt(i);
387 if (!reset_value[virt])
389 rdmsrl(msrs->counters[i].addr, val);
390 /* bit is clear if overflowed: */
391 if (val & OP_CTR_OVERFLOW)
393 oprofile_add_sample(regs, virt);
394 wrmsrl(msrs->counters[i].addr, -(u64)reset_value[virt]);
397 op_amd_handle_ibs(regs, msrs);
399 /* See op_model_ppro.c */
403 static void op_amd_start(struct op_msrs const * const msrs)
408 for (i = 0; i < NUM_COUNTERS; ++i) {
409 if (!reset_value[op_x86_phys_to_virt(i)])
411 rdmsrl(msrs->controls[i].addr, val);
412 val |= ARCH_PERFMON_EVENTSEL0_ENABLE;
413 wrmsrl(msrs->controls[i].addr, val);
419 static void op_amd_stop(struct op_msrs const * const msrs)
425 * Subtle: stop on all counters to avoid race with setting our
428 for (i = 0; i < NUM_COUNTERS; ++i) {
429 if (!reset_value[op_x86_phys_to_virt(i)])
431 rdmsrl(msrs->controls[i].addr, val);
432 val &= ~ARCH_PERFMON_EVENTSEL0_ENABLE;
433 wrmsrl(msrs->controls[i].addr, val);
439 static void op_amd_shutdown(struct op_msrs const * const msrs)
443 for (i = 0; i < NUM_COUNTERS; ++i) {
444 if (msrs->counters[i].addr)
445 release_perfctr_nmi(MSR_K7_PERFCTR0 + i);
447 for (i = 0; i < NUM_CONTROLS; ++i) {
448 if (msrs->controls[i].addr)
449 release_evntsel_nmi(MSR_K7_EVNTSEL0 + i);
453 static u8 ibs_eilvt_off;
455 static inline void apic_init_ibs_nmi_per_cpu(void *arg)
457 ibs_eilvt_off = setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_NMI, 0);
460 static inline void apic_clear_ibs_nmi_per_cpu(void *arg)
462 setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_FIX, 1);
465 static int init_ibs_nmi(void)
467 #define IBSCTL_LVTOFFSETVAL (1 << 8)
469 struct pci_dev *cpu_cfg;
474 on_each_cpu(apic_init_ibs_nmi_per_cpu, NULL, 1);
479 cpu_cfg = pci_get_device(PCI_VENDOR_ID_AMD,
480 PCI_DEVICE_ID_AMD_10H_NB_MISC,
485 pci_write_config_dword(cpu_cfg, IBSCTL, ibs_eilvt_off
486 | IBSCTL_LVTOFFSETVAL);
487 pci_read_config_dword(cpu_cfg, IBSCTL, &value);
488 if (value != (ibs_eilvt_off | IBSCTL_LVTOFFSETVAL)) {
489 pci_dev_put(cpu_cfg);
490 printk(KERN_DEBUG "Failed to setup IBS LVT offset, "
491 "IBSCTL = 0x%08x", value);
497 printk(KERN_DEBUG "No CPU node configured for IBS");
504 /* uninitialize the APIC for the IBS interrupts if needed */
505 static void clear_ibs_nmi(void)
508 on_each_cpu(apic_clear_ibs_nmi_per_cpu, NULL, 1);
511 /* initialize the APIC for the IBS interrupts if available */
512 static void ibs_init(void)
514 ibs_caps = get_ibs_caps();
519 if (init_ibs_nmi()) {
524 printk(KERN_INFO "oprofile: AMD IBS detected (0x%08x)\n",
528 static void ibs_exit(void)
536 static int (*create_arch_files)(struct super_block *sb, struct dentry *root);
538 static int setup_ibs_files(struct super_block *sb, struct dentry *root)
543 /* architecture specific files */
544 if (create_arch_files)
545 ret = create_arch_files(sb, root);
553 /* model specific files */
555 /* setup some reasonable defaults */
556 ibs_config.max_cnt_fetch = 250000;
557 ibs_config.fetch_enabled = 0;
558 ibs_config.max_cnt_op = 250000;
559 ibs_config.op_enabled = 0;
560 ibs_config.dispatched_ops = 0;
562 dir = oprofilefs_mkdir(sb, root, "ibs_fetch");
563 oprofilefs_create_ulong(sb, dir, "enable",
564 &ibs_config.fetch_enabled);
565 oprofilefs_create_ulong(sb, dir, "max_count",
566 &ibs_config.max_cnt_fetch);
567 oprofilefs_create_ulong(sb, dir, "rand_enable",
568 &ibs_config.rand_en);
570 dir = oprofilefs_mkdir(sb, root, "ibs_op");
571 oprofilefs_create_ulong(sb, dir, "enable",
572 &ibs_config.op_enabled);
573 oprofilefs_create_ulong(sb, dir, "max_count",
574 &ibs_config.max_cnt_op);
575 if (ibs_caps & IBS_CAPS_OPCNT)
576 oprofilefs_create_ulong(sb, dir, "dispatched_ops",
577 &ibs_config.dispatched_ops);
582 static int op_amd_init(struct oprofile_operations *ops)
585 create_arch_files = ops->create_files;
586 ops->create_files = setup_ibs_files;
590 static void op_amd_exit(void)
595 struct op_x86_model_spec op_amd_spec = {
596 .num_counters = NUM_COUNTERS,
597 .num_controls = NUM_CONTROLS,
598 .num_virt_counters = NUM_VIRT_COUNTERS,
599 .reserved = MSR_AMD_EVENTSEL_RESERVED,
600 .event_mask = OP_EVENT_MASK,
603 .fill_in_addresses = &op_amd_fill_in_addresses,
604 .setup_ctrs = &op_amd_setup_ctrs,
605 .check_ctrs = &op_amd_check_ctrs,
606 .start = &op_amd_start,
607 .stop = &op_amd_stop,
608 .shutdown = &op_amd_shutdown,
609 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
610 .switch_ctrl = &op_mux_switch_ctrl,