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22#include <linux/module.h>
23#include <linux/kernel.h>
24#include <linux/sched.h>
25#include <linux/interrupt.h>
26#include <linux/proc_fs.h>
27#include <linux/seq_file.h>
28#include <linux/init.h>
29#include <linux/vmalloc.h>
30#include <linux/mm.h>
31#include <linux/sysctl.h>
32#include <linux/list.h>
33#include <linux/file.h>
34#include <linux/poll.h>
35#include <linux/vfs.h>
36#include <linux/smp.h>
37#include <linux/pagemap.h>
38#include <linux/mount.h>
39#include <linux/bitops.h>
40#include <linux/capability.h>
41#include <linux/rcupdate.h>
42#include <linux/completion.h>
43#include <linux/tracehook.h>
44#include <linux/slab.h>
45#include <linux/cpu.h>
46
47#include <asm/errno.h>
48#include <asm/intrinsics.h>
49#include <asm/page.h>
50#include <asm/perfmon.h>
51#include <asm/processor.h>
52#include <asm/signal.h>
53#include <asm/uaccess.h>
54#include <asm/delay.h>
55
56#ifdef CONFIG_PERFMON
57
58
59
60#define PFM_CTX_UNLOADED 1
61#define PFM_CTX_LOADED 2
62#define PFM_CTX_MASKED 3
63#define PFM_CTX_ZOMBIE 4
64
65#define PFM_INVALID_ACTIVATION (~0UL)
66
67#define PFM_NUM_PMC_REGS 64
68#define PFM_NUM_PMD_REGS 64
69
70
71
72
73#define PFM_MAX_MSGS 32
74#define PFM_CTXQ_EMPTY(g) ((g)->ctx_msgq_head == (g)->ctx_msgq_tail)
75
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84
85
86
87#define PFM_REG_NOTIMPL 0x0
88#define PFM_REG_IMPL 0x1
89#define PFM_REG_END 0x2
90#define PFM_REG_MONITOR (0x1<<4|PFM_REG_IMPL)
91#define PFM_REG_COUNTING (0x2<<4|PFM_REG_MONITOR)
92#define PFM_REG_CONTROL (0x4<<4|PFM_REG_IMPL)
93#define PFM_REG_CONFIG (0x8<<4|PFM_REG_IMPL)
94#define PFM_REG_BUFFER (0xc<<4|PFM_REG_IMPL)
95
96#define PMC_IS_LAST(i) (pmu_conf->pmc_desc[i].type & PFM_REG_END)
97#define PMD_IS_LAST(i) (pmu_conf->pmd_desc[i].type & PFM_REG_END)
98
99#define PMC_OVFL_NOTIFY(ctx, i) ((ctx)->ctx_pmds[i].flags & PFM_REGFL_OVFL_NOTIFY)
100
101
102#define PMC_IS_IMPL(i) (i< PMU_MAX_PMCS && (pmu_conf->pmc_desc[i].type & PFM_REG_IMPL))
103#define PMD_IS_IMPL(i) (i< PMU_MAX_PMDS && (pmu_conf->pmd_desc[i].type & PFM_REG_IMPL))
104
105
106#define PMD_IS_COUNTING(i) ((pmu_conf->pmd_desc[i].type & PFM_REG_COUNTING) == PFM_REG_COUNTING)
107#define PMC_IS_COUNTING(i) ((pmu_conf->pmc_desc[i].type & PFM_REG_COUNTING) == PFM_REG_COUNTING)
108#define PMC_IS_MONITOR(i) ((pmu_conf->pmc_desc[i].type & PFM_REG_MONITOR) == PFM_REG_MONITOR)
109#define PMC_IS_CONTROL(i) ((pmu_conf->pmc_desc[i].type & PFM_REG_CONTROL) == PFM_REG_CONTROL)
110
111#define PMC_DFL_VAL(i) pmu_conf->pmc_desc[i].default_value
112#define PMC_RSVD_MASK(i) pmu_conf->pmc_desc[i].reserved_mask
113#define PMD_PMD_DEP(i) pmu_conf->pmd_desc[i].dep_pmd[0]
114#define PMC_PMD_DEP(i) pmu_conf->pmc_desc[i].dep_pmd[0]
115
116#define PFM_NUM_IBRS IA64_NUM_DBG_REGS
117#define PFM_NUM_DBRS IA64_NUM_DBG_REGS
118
119#define CTX_OVFL_NOBLOCK(c) ((c)->ctx_fl_block == 0)
120#define CTX_HAS_SMPL(c) ((c)->ctx_fl_is_sampling)
121#define PFM_CTX_TASK(h) (h)->ctx_task
122
123#define PMU_PMC_OI 5
124
125
126#define CTX_USED_PMD(ctx, mask) (ctx)->ctx_used_pmds[0] |= (mask)
127#define CTX_IS_USED_PMD(ctx, c) (((ctx)->ctx_used_pmds[0] & (1UL << (c))) != 0UL)
128
129#define CTX_USED_MONITOR(ctx, mask) (ctx)->ctx_used_monitors[0] |= (mask)
130
131#define CTX_USED_IBR(ctx,n) (ctx)->ctx_used_ibrs[(n)>>6] |= 1UL<< ((n) % 64)
132#define CTX_USED_DBR(ctx,n) (ctx)->ctx_used_dbrs[(n)>>6] |= 1UL<< ((n) % 64)
133#define CTX_USES_DBREGS(ctx) (((pfm_context_t *)(ctx))->ctx_fl_using_dbreg==1)
134#define PFM_CODE_RR 0
135#define PFM_DATA_RR 1
136
137#define PFM_CPUINFO_CLEAR(v) pfm_get_cpu_var(pfm_syst_info) &= ~(v)
138#define PFM_CPUINFO_SET(v) pfm_get_cpu_var(pfm_syst_info) |= (v)
139#define PFM_CPUINFO_GET() pfm_get_cpu_var(pfm_syst_info)
140
141#define RDEP(x) (1UL<<(x))
142
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159
160
161#define PROTECT_CTX(c, f) \
162 do { \
163 DPRINT(("spinlock_irq_save ctx %p by [%d]\n", c, task_pid_nr(current))); \
164 spin_lock_irqsave(&(c)->ctx_lock, f); \
165 DPRINT(("spinlocked ctx %p by [%d]\n", c, task_pid_nr(current))); \
166 } while(0)
167
168#define UNPROTECT_CTX(c, f) \
169 do { \
170 DPRINT(("spinlock_irq_restore ctx %p by [%d]\n", c, task_pid_nr(current))); \
171 spin_unlock_irqrestore(&(c)->ctx_lock, f); \
172 } while(0)
173
174#define PROTECT_CTX_NOPRINT(c, f) \
175 do { \
176 spin_lock_irqsave(&(c)->ctx_lock, f); \
177 } while(0)
178
179
180#define UNPROTECT_CTX_NOPRINT(c, f) \
181 do { \
182 spin_unlock_irqrestore(&(c)->ctx_lock, f); \
183 } while(0)
184
185
186#define PROTECT_CTX_NOIRQ(c) \
187 do { \
188 spin_lock(&(c)->ctx_lock); \
189 } while(0)
190
191#define UNPROTECT_CTX_NOIRQ(c) \
192 do { \
193 spin_unlock(&(c)->ctx_lock); \
194 } while(0)
195
196
197#ifdef CONFIG_SMP
198
199#define GET_ACTIVATION() pfm_get_cpu_var(pmu_activation_number)
200#define INC_ACTIVATION() pfm_get_cpu_var(pmu_activation_number)++
201#define SET_ACTIVATION(c) (c)->ctx_last_activation = GET_ACTIVATION()
202
203#else
204#define SET_ACTIVATION(t) do {} while(0)
205#define GET_ACTIVATION(t) do {} while(0)
206#define INC_ACTIVATION(t) do {} while(0)
207#endif
208
209#define SET_PMU_OWNER(t, c) do { pfm_get_cpu_var(pmu_owner) = (t); pfm_get_cpu_var(pmu_ctx) = (c); } while(0)
210#define GET_PMU_OWNER() pfm_get_cpu_var(pmu_owner)
211#define GET_PMU_CTX() pfm_get_cpu_var(pmu_ctx)
212
213#define LOCK_PFS(g) spin_lock_irqsave(&pfm_sessions.pfs_lock, g)
214#define UNLOCK_PFS(g) spin_unlock_irqrestore(&pfm_sessions.pfs_lock, g)
215
216#define PFM_REG_RETFLAG_SET(flags, val) do { flags &= ~PFM_REG_RETFL_MASK; flags |= (val); } while(0)
217
218
219
220
221#define PMC0_HAS_OVFL(cmp0) (cmp0 & ~0x1UL)
222
223#define PFMFS_MAGIC 0xa0b4d889
224
225
226
227
228#define PFM_DEBUGGING 1
229#ifdef PFM_DEBUGGING
230#define DPRINT(a) \
231 do { \
232 if (unlikely(pfm_sysctl.debug >0)) { printk("%s.%d: CPU%d [%d] ", __func__, __LINE__, smp_processor_id(), task_pid_nr(current)); printk a; } \
233 } while (0)
234
235#define DPRINT_ovfl(a) \
236 do { \
237 if (unlikely(pfm_sysctl.debug > 0 && pfm_sysctl.debug_ovfl >0)) { printk("%s.%d: CPU%d [%d] ", __func__, __LINE__, smp_processor_id(), task_pid_nr(current)); printk a; } \
238 } while (0)
239#endif
240
241
242
243
244
245
246typedef struct {
247 unsigned long val;
248 unsigned long lval;
249 unsigned long long_reset;
250 unsigned long short_reset;
251 unsigned long reset_pmds[4];
252 unsigned long smpl_pmds[4];
253 unsigned long seed;
254 unsigned long mask;
255 unsigned int flags;
256 unsigned long eventid;
257} pfm_counter_t;
258
259
260
261
262typedef struct {
263 unsigned int block:1;
264 unsigned int system:1;
265 unsigned int using_dbreg:1;
266 unsigned int is_sampling:1;
267 unsigned int excl_idle:1;
268 unsigned int going_zombie:1;
269 unsigned int trap_reason:2;
270 unsigned int no_msg:1;
271 unsigned int can_restart:1;
272 unsigned int reserved:22;
273} pfm_context_flags_t;
274
275#define PFM_TRAP_REASON_NONE 0x0
276#define PFM_TRAP_REASON_BLOCK 0x1
277#define PFM_TRAP_REASON_RESET 0x2
278
279
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281
282
283
284typedef struct pfm_context {
285 spinlock_t ctx_lock;
286
287 pfm_context_flags_t ctx_flags;
288 unsigned int ctx_state;
289
290 struct task_struct *ctx_task;
291
292 unsigned long ctx_ovfl_regs[4];
293
294 struct completion ctx_restart_done;
295
296 unsigned long ctx_used_pmds[4];
297 unsigned long ctx_all_pmds[4];
298 unsigned long ctx_reload_pmds[4];
299
300 unsigned long ctx_all_pmcs[4];
301 unsigned long ctx_reload_pmcs[4];
302 unsigned long ctx_used_monitors[4];
303
304 unsigned long ctx_pmcs[PFM_NUM_PMC_REGS];
305
306 unsigned int ctx_used_ibrs[1];
307 unsigned int ctx_used_dbrs[1];
308 unsigned long ctx_dbrs[IA64_NUM_DBG_REGS];
309 unsigned long ctx_ibrs[IA64_NUM_DBG_REGS];
310
311 pfm_counter_t ctx_pmds[PFM_NUM_PMD_REGS];
312
313 unsigned long th_pmcs[PFM_NUM_PMC_REGS];
314 unsigned long th_pmds[PFM_NUM_PMD_REGS];
315
316 unsigned long ctx_saved_psr_up;
317
318 unsigned long ctx_last_activation;
319 unsigned int ctx_last_cpu;
320 unsigned int ctx_cpu;
321
322 int ctx_fd;
323 pfm_ovfl_arg_t ctx_ovfl_arg;
324
325 pfm_buffer_fmt_t *ctx_buf_fmt;
326 void *ctx_smpl_hdr;
327 unsigned long ctx_smpl_size;
328 void *ctx_smpl_vaddr;
329
330 wait_queue_head_t ctx_msgq_wait;
331 pfm_msg_t ctx_msgq[PFM_MAX_MSGS];
332 int ctx_msgq_head;
333 int ctx_msgq_tail;
334 struct fasync_struct *ctx_async_queue;
335
336 wait_queue_head_t ctx_zombieq;
337} pfm_context_t;
338
339
340
341
342
343#define PFM_IS_FILE(f) ((f)->f_op == &pfm_file_ops)
344
345#define PFM_GET_CTX(t) ((pfm_context_t *)(t)->thread.pfm_context)
346
347#ifdef CONFIG_SMP
348#define SET_LAST_CPU(ctx, v) (ctx)->ctx_last_cpu = (v)
349#define GET_LAST_CPU(ctx) (ctx)->ctx_last_cpu
350#else
351#define SET_LAST_CPU(ctx, v) do {} while(0)
352#define GET_LAST_CPU(ctx) do {} while(0)
353#endif
354
355
356#define ctx_fl_block ctx_flags.block
357#define ctx_fl_system ctx_flags.system
358#define ctx_fl_using_dbreg ctx_flags.using_dbreg
359#define ctx_fl_is_sampling ctx_flags.is_sampling
360#define ctx_fl_excl_idle ctx_flags.excl_idle
361#define ctx_fl_going_zombie ctx_flags.going_zombie
362#define ctx_fl_trap_reason ctx_flags.trap_reason
363#define ctx_fl_no_msg ctx_flags.no_msg
364#define ctx_fl_can_restart ctx_flags.can_restart
365
366#define PFM_SET_WORK_PENDING(t, v) do { (t)->thread.pfm_needs_checking = v; } while(0);
367#define PFM_GET_WORK_PENDING(t) (t)->thread.pfm_needs_checking
368
369
370
371
372
373typedef struct {
374 spinlock_t pfs_lock;
375
376 unsigned int pfs_task_sessions;
377 unsigned int pfs_sys_sessions;
378 unsigned int pfs_sys_use_dbregs;
379 unsigned int pfs_ptrace_use_dbregs;
380 struct task_struct *pfs_sys_session[NR_CPUS];
381} pfm_session_t;
382
383
384
385
386
387
388typedef int (*pfm_reg_check_t)(struct task_struct *task, pfm_context_t *ctx, unsigned int cnum, unsigned long *val, struct pt_regs *regs);
389typedef struct {
390 unsigned int type;
391 int pm_pos;
392 unsigned long default_value;
393 unsigned long reserved_mask;
394 pfm_reg_check_t read_check;
395 pfm_reg_check_t write_check;
396 unsigned long dep_pmd[4];
397 unsigned long dep_pmc[4];
398} pfm_reg_desc_t;
399
400
401#define PMC_PM(cnum, val) (((val) >> (pmu_conf->pmc_desc[cnum].pm_pos)) & 0x1)
402
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412
413
414
415typedef struct {
416 unsigned long ovfl_val;
417
418 pfm_reg_desc_t *pmc_desc;
419 pfm_reg_desc_t *pmd_desc;
420
421 unsigned int num_pmcs;
422 unsigned int num_pmds;
423 unsigned long impl_pmcs[4];
424 unsigned long impl_pmds[4];
425
426 char *pmu_name;
427 unsigned int pmu_family;
428 unsigned int flags;
429 unsigned int num_ibrs;
430 unsigned int num_dbrs;
431 unsigned int num_counters;
432 int (*probe)(void);
433 unsigned int use_rr_dbregs:1;
434} pmu_config_t;
435
436
437
438#define PFM_PMU_IRQ_RESEND 1
439
440
441
442
443typedef struct {
444 unsigned long ibr_mask:56;
445 unsigned long ibr_plm:4;
446 unsigned long ibr_ig:3;
447 unsigned long ibr_x:1;
448} ibr_mask_reg_t;
449
450typedef struct {
451 unsigned long dbr_mask:56;
452 unsigned long dbr_plm:4;
453 unsigned long dbr_ig:2;
454 unsigned long dbr_w:1;
455 unsigned long dbr_r:1;
456} dbr_mask_reg_t;
457
458typedef union {
459 unsigned long val;
460 ibr_mask_reg_t ibr;
461 dbr_mask_reg_t dbr;
462} dbreg_t;
463
464
465
466
467
468typedef struct {
469 int (*cmd_func)(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs);
470 char *cmd_name;
471 int cmd_flags;
472 unsigned int cmd_narg;
473 size_t cmd_argsize;
474 int (*cmd_getsize)(void *arg, size_t *sz);
475} pfm_cmd_desc_t;
476
477#define PFM_CMD_FD 0x01
478#define PFM_CMD_ARG_READ 0x02
479#define PFM_CMD_ARG_RW 0x04
480#define PFM_CMD_STOP 0x08
481
482
483#define PFM_CMD_NAME(cmd) pfm_cmd_tab[(cmd)].cmd_name
484#define PFM_CMD_READ_ARG(cmd) (pfm_cmd_tab[(cmd)].cmd_flags & PFM_CMD_ARG_READ)
485#define PFM_CMD_RW_ARG(cmd) (pfm_cmd_tab[(cmd)].cmd_flags & PFM_CMD_ARG_RW)
486#define PFM_CMD_USE_FD(cmd) (pfm_cmd_tab[(cmd)].cmd_flags & PFM_CMD_FD)
487#define PFM_CMD_STOPPED(cmd) (pfm_cmd_tab[(cmd)].cmd_flags & PFM_CMD_STOP)
488
489#define PFM_CMD_ARG_MANY -1
490
491typedef struct {
492 unsigned long pfm_spurious_ovfl_intr_count;
493 unsigned long pfm_replay_ovfl_intr_count;
494 unsigned long pfm_ovfl_intr_count;
495 unsigned long pfm_ovfl_intr_cycles;
496 unsigned long pfm_ovfl_intr_cycles_min;
497 unsigned long pfm_ovfl_intr_cycles_max;
498 unsigned long pfm_smpl_handler_calls;
499 unsigned long pfm_smpl_handler_cycles;
500 char pad[SMP_CACHE_BYTES] ____cacheline_aligned;
501} pfm_stats_t;
502
503
504
505
506static pfm_stats_t pfm_stats[NR_CPUS];
507static pfm_session_t pfm_sessions;
508
509static DEFINE_SPINLOCK(pfm_alt_install_check);
510static pfm_intr_handler_desc_t *pfm_alt_intr_handler;
511
512static struct proc_dir_entry *perfmon_dir;
513static pfm_uuid_t pfm_null_uuid = {0,};
514
515static spinlock_t pfm_buffer_fmt_lock;
516static LIST_HEAD(pfm_buffer_fmt_list);
517
518static pmu_config_t *pmu_conf;
519
520
521pfm_sysctl_t pfm_sysctl;
522EXPORT_SYMBOL(pfm_sysctl);
523
524static struct ctl_table pfm_ctl_table[] = {
525 {
526 .procname = "debug",
527 .data = &pfm_sysctl.debug,
528 .maxlen = sizeof(int),
529 .mode = 0666,
530 .proc_handler = proc_dointvec,
531 },
532 {
533 .procname = "debug_ovfl",
534 .data = &pfm_sysctl.debug_ovfl,
535 .maxlen = sizeof(int),
536 .mode = 0666,
537 .proc_handler = proc_dointvec,
538 },
539 {
540 .procname = "fastctxsw",
541 .data = &pfm_sysctl.fastctxsw,
542 .maxlen = sizeof(int),
543 .mode = 0600,
544 .proc_handler = proc_dointvec,
545 },
546 {
547 .procname = "expert_mode",
548 .data = &pfm_sysctl.expert_mode,
549 .maxlen = sizeof(int),
550 .mode = 0600,
551 .proc_handler = proc_dointvec,
552 },
553 {}
554};
555static struct ctl_table pfm_sysctl_dir[] = {
556 {
557 .procname = "perfmon",
558 .mode = 0555,
559 .child = pfm_ctl_table,
560 },
561 {}
562};
563static struct ctl_table pfm_sysctl_root[] = {
564 {
565 .procname = "kernel",
566 .mode = 0555,
567 .child = pfm_sysctl_dir,
568 },
569 {}
570};
571static struct ctl_table_header *pfm_sysctl_header;
572
573static int pfm_context_unload(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs);
574
575#define pfm_get_cpu_var(v) __ia64_per_cpu_var(v)
576#define pfm_get_cpu_data(a,b) per_cpu(a, b)
577
578static inline void
579pfm_put_task(struct task_struct *task)
580{
581 if (task != current) put_task_struct(task);
582}
583
584static inline void
585pfm_reserve_page(unsigned long a)
586{
587 SetPageReserved(vmalloc_to_page((void *)a));
588}
589static inline void
590pfm_unreserve_page(unsigned long a)
591{
592 ClearPageReserved(vmalloc_to_page((void*)a));
593}
594
595static inline unsigned long
596pfm_protect_ctx_ctxsw(pfm_context_t *x)
597{
598 spin_lock(&(x)->ctx_lock);
599 return 0UL;
600}
601
602static inline void
603pfm_unprotect_ctx_ctxsw(pfm_context_t *x, unsigned long f)
604{
605 spin_unlock(&(x)->ctx_lock);
606}
607
608
609static const struct dentry_operations pfmfs_dentry_operations;
610
611static struct dentry *
612pfmfs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data)
613{
614 return mount_pseudo(fs_type, "pfm:", NULL, &pfmfs_dentry_operations,
615 PFMFS_MAGIC);
616}
617
618static struct file_system_type pfm_fs_type = {
619 .name = "pfmfs",
620 .mount = pfmfs_mount,
621 .kill_sb = kill_anon_super,
622};
623MODULE_ALIAS_FS("pfmfs");
624
625DEFINE_PER_CPU(unsigned long, pfm_syst_info);
626DEFINE_PER_CPU(struct task_struct *, pmu_owner);
627DEFINE_PER_CPU(pfm_context_t *, pmu_ctx);
628DEFINE_PER_CPU(unsigned long, pmu_activation_number);
629EXPORT_PER_CPU_SYMBOL_GPL(pfm_syst_info);
630
631
632
633static const struct file_operations pfm_file_ops;
634
635
636
637
638#ifndef CONFIG_SMP
639static void pfm_lazy_save_regs (struct task_struct *ta);
640#endif
641
642void dump_pmu_state(const char *);
643static int pfm_write_ibr_dbr(int mode, pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs);
644
645#include "perfmon_itanium.h"
646#include "perfmon_mckinley.h"
647#include "perfmon_montecito.h"
648#include "perfmon_generic.h"
649
650static pmu_config_t *pmu_confs[]={
651 &pmu_conf_mont,
652 &pmu_conf_mck,
653 &pmu_conf_ita,
654 &pmu_conf_gen,
655 NULL
656};
657
658
659static int pfm_end_notify_user(pfm_context_t *ctx);
660
661static inline void
662pfm_clear_psr_pp(void)
663{
664 ia64_rsm(IA64_PSR_PP);
665 ia64_srlz_i();
666}
667
668static inline void
669pfm_set_psr_pp(void)
670{
671 ia64_ssm(IA64_PSR_PP);
672 ia64_srlz_i();
673}
674
675static inline void
676pfm_clear_psr_up(void)
677{
678 ia64_rsm(IA64_PSR_UP);
679 ia64_srlz_i();
680}
681
682static inline void
683pfm_set_psr_up(void)
684{
685 ia64_ssm(IA64_PSR_UP);
686 ia64_srlz_i();
687}
688
689static inline unsigned long
690pfm_get_psr(void)
691{
692 unsigned long tmp;
693 tmp = ia64_getreg(_IA64_REG_PSR);
694 ia64_srlz_i();
695 return tmp;
696}
697
698static inline void
699pfm_set_psr_l(unsigned long val)
700{
701 ia64_setreg(_IA64_REG_PSR_L, val);
702 ia64_srlz_i();
703}
704
705static inline void
706pfm_freeze_pmu(void)
707{
708 ia64_set_pmc(0,1UL);
709 ia64_srlz_d();
710}
711
712static inline void
713pfm_unfreeze_pmu(void)
714{
715 ia64_set_pmc(0,0UL);
716 ia64_srlz_d();
717}
718
719static inline void
720pfm_restore_ibrs(unsigned long *ibrs, unsigned int nibrs)
721{
722 int i;
723
724 for (i=0; i < nibrs; i++) {
725 ia64_set_ibr(i, ibrs[i]);
726 ia64_dv_serialize_instruction();
727 }
728 ia64_srlz_i();
729}
730
731static inline void
732pfm_restore_dbrs(unsigned long *dbrs, unsigned int ndbrs)
733{
734 int i;
735
736 for (i=0; i < ndbrs; i++) {
737 ia64_set_dbr(i, dbrs[i]);
738 ia64_dv_serialize_data();
739 }
740 ia64_srlz_d();
741}
742
743
744
745
746static inline unsigned long
747pfm_read_soft_counter(pfm_context_t *ctx, int i)
748{
749 return ctx->ctx_pmds[i].val + (ia64_get_pmd(i) & pmu_conf->ovfl_val);
750}
751
752
753
754
755static inline void
756pfm_write_soft_counter(pfm_context_t *ctx, int i, unsigned long val)
757{
758 unsigned long ovfl_val = pmu_conf->ovfl_val;
759
760 ctx->ctx_pmds[i].val = val & ~ovfl_val;
761
762
763
764
765 ia64_set_pmd(i, val & ovfl_val);
766}
767
768static pfm_msg_t *
769pfm_get_new_msg(pfm_context_t *ctx)
770{
771 int idx, next;
772
773 next = (ctx->ctx_msgq_tail+1) % PFM_MAX_MSGS;
774
775 DPRINT(("ctx_fd=%p head=%d tail=%d\n", ctx, ctx->ctx_msgq_head, ctx->ctx_msgq_tail));
776 if (next == ctx->ctx_msgq_head) return NULL;
777
778 idx = ctx->ctx_msgq_tail;
779 ctx->ctx_msgq_tail = next;
780
781 DPRINT(("ctx=%p head=%d tail=%d msg=%d\n", ctx, ctx->ctx_msgq_head, ctx->ctx_msgq_tail, idx));
782
783 return ctx->ctx_msgq+idx;
784}
785
786static pfm_msg_t *
787pfm_get_next_msg(pfm_context_t *ctx)
788{
789 pfm_msg_t *msg;
790
791 DPRINT(("ctx=%p head=%d tail=%d\n", ctx, ctx->ctx_msgq_head, ctx->ctx_msgq_tail));
792
793 if (PFM_CTXQ_EMPTY(ctx)) return NULL;
794
795
796
797
798 msg = ctx->ctx_msgq+ctx->ctx_msgq_head;
799
800
801
802
803 ctx->ctx_msgq_head = (ctx->ctx_msgq_head+1) % PFM_MAX_MSGS;
804
805 DPRINT(("ctx=%p head=%d tail=%d type=%d\n", ctx, ctx->ctx_msgq_head, ctx->ctx_msgq_tail, msg->pfm_gen_msg.msg_type));
806
807 return msg;
808}
809
810static void
811pfm_reset_msgq(pfm_context_t *ctx)
812{
813 ctx->ctx_msgq_head = ctx->ctx_msgq_tail = 0;
814 DPRINT(("ctx=%p msgq reset\n", ctx));
815}
816
817static void *
818pfm_rvmalloc(unsigned long size)
819{
820 void *mem;
821 unsigned long addr;
822
823 size = PAGE_ALIGN(size);
824 mem = vzalloc(size);
825 if (mem) {
826
827 addr = (unsigned long)mem;
828 while (size > 0) {
829 pfm_reserve_page(addr);
830 addr+=PAGE_SIZE;
831 size-=PAGE_SIZE;
832 }
833 }
834 return mem;
835}
836
837static void
838pfm_rvfree(void *mem, unsigned long size)
839{
840 unsigned long addr;
841
842 if (mem) {
843 DPRINT(("freeing physical buffer @%p size=%lu\n", mem, size));
844 addr = (unsigned long) mem;
845 while ((long) size > 0) {
846 pfm_unreserve_page(addr);
847 addr+=PAGE_SIZE;
848 size-=PAGE_SIZE;
849 }
850 vfree(mem);
851 }
852 return;
853}
854
855static pfm_context_t *
856pfm_context_alloc(int ctx_flags)
857{
858 pfm_context_t *ctx;
859
860
861
862
863
864 ctx = kzalloc(sizeof(pfm_context_t), GFP_KERNEL);
865 if (ctx) {
866 DPRINT(("alloc ctx @%p\n", ctx));
867
868
869
870
871 spin_lock_init(&ctx->ctx_lock);
872
873
874
875
876 ctx->ctx_state = PFM_CTX_UNLOADED;
877
878
879
880
881 ctx->ctx_fl_block = (ctx_flags & PFM_FL_NOTIFY_BLOCK) ? 1 : 0;
882 ctx->ctx_fl_system = (ctx_flags & PFM_FL_SYSTEM_WIDE) ? 1: 0;
883 ctx->ctx_fl_no_msg = (ctx_flags & PFM_FL_OVFL_NO_MSG) ? 1: 0;
884
885
886
887
888
889
890
891
892 init_completion(&ctx->ctx_restart_done);
893
894
895
896
897 ctx->ctx_last_activation = PFM_INVALID_ACTIVATION;
898 SET_LAST_CPU(ctx, -1);
899
900
901
902
903 ctx->ctx_msgq_head = ctx->ctx_msgq_tail = 0;
904 init_waitqueue_head(&ctx->ctx_msgq_wait);
905 init_waitqueue_head(&ctx->ctx_zombieq);
906
907 }
908 return ctx;
909}
910
911static void
912pfm_context_free(pfm_context_t *ctx)
913{
914 if (ctx) {
915 DPRINT(("free ctx @%p\n", ctx));
916 kfree(ctx);
917 }
918}
919
920static void
921pfm_mask_monitoring(struct task_struct *task)
922{
923 pfm_context_t *ctx = PFM_GET_CTX(task);
924 unsigned long mask, val, ovfl_mask;
925 int i;
926
927 DPRINT_ovfl(("masking monitoring for [%d]\n", task_pid_nr(task)));
928
929 ovfl_mask = pmu_conf->ovfl_val;
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949 mask = ctx->ctx_used_pmds[0];
950 for (i = 0; mask; i++, mask>>=1) {
951
952 if ((mask & 0x1) == 0) continue;
953 val = ia64_get_pmd(i);
954
955 if (PMD_IS_COUNTING(i)) {
956
957
958
959 ctx->ctx_pmds[i].val += (val & ovfl_mask);
960 } else {
961 ctx->ctx_pmds[i].val = val;
962 }
963 DPRINT_ovfl(("pmd[%d]=0x%lx hw_pmd=0x%lx\n",
964 i,
965 ctx->ctx_pmds[i].val,
966 val & ovfl_mask));
967 }
968
969
970
971
972
973
974
975
976 mask = ctx->ctx_used_monitors[0] >> PMU_FIRST_COUNTER;
977 for(i= PMU_FIRST_COUNTER; mask; i++, mask>>=1) {
978 if ((mask & 0x1) == 0UL) continue;
979 ia64_set_pmc(i, ctx->th_pmcs[i] & ~0xfUL);
980 ctx->th_pmcs[i] &= ~0xfUL;
981 DPRINT_ovfl(("pmc[%d]=0x%lx\n", i, ctx->th_pmcs[i]));
982 }
983
984
985
986 ia64_srlz_d();
987}
988
989
990
991
992
993
994static void
995pfm_restore_monitoring(struct task_struct *task)
996{
997 pfm_context_t *ctx = PFM_GET_CTX(task);
998 unsigned long mask, ovfl_mask;
999 unsigned long psr, val;
1000 int i, is_system;
1001
1002 is_system = ctx->ctx_fl_system;
1003 ovfl_mask = pmu_conf->ovfl_val;
1004
1005 if (task != current) {
1006 printk(KERN_ERR "perfmon.%d: invalid task[%d] current[%d]\n", __LINE__, task_pid_nr(task), task_pid_nr(current));
1007 return;
1008 }
1009 if (ctx->ctx_state != PFM_CTX_MASKED) {
1010 printk(KERN_ERR "perfmon.%d: task[%d] current[%d] invalid state=%d\n", __LINE__,
1011 task_pid_nr(task), task_pid_nr(current), ctx->ctx_state);
1012 return;
1013 }
1014 psr = pfm_get_psr();
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025 if (is_system && (PFM_CPUINFO_GET() & PFM_CPUINFO_DCR_PP)) {
1026
1027 ia64_setreg(_IA64_REG_CR_DCR, ia64_getreg(_IA64_REG_CR_DCR) & ~IA64_DCR_PP);
1028 pfm_clear_psr_pp();
1029 } else {
1030 pfm_clear_psr_up();
1031 }
1032
1033
1034
1035 mask = ctx->ctx_used_pmds[0];
1036 for (i = 0; mask; i++, mask>>=1) {
1037
1038 if ((mask & 0x1) == 0) continue;
1039
1040 if (PMD_IS_COUNTING(i)) {
1041
1042
1043
1044
1045 val = ctx->ctx_pmds[i].val & ovfl_mask;
1046 ctx->ctx_pmds[i].val &= ~ovfl_mask;
1047 } else {
1048 val = ctx->ctx_pmds[i].val;
1049 }
1050 ia64_set_pmd(i, val);
1051
1052 DPRINT(("pmd[%d]=0x%lx hw_pmd=0x%lx\n",
1053 i,
1054 ctx->ctx_pmds[i].val,
1055 val));
1056 }
1057
1058
1059
1060 mask = ctx->ctx_used_monitors[0] >> PMU_FIRST_COUNTER;
1061 for(i= PMU_FIRST_COUNTER; mask; i++, mask>>=1) {
1062 if ((mask & 0x1) == 0UL) continue;
1063 ctx->th_pmcs[i] = ctx->ctx_pmcs[i];
1064 ia64_set_pmc(i, ctx->th_pmcs[i]);
1065 DPRINT(("[%d] pmc[%d]=0x%lx\n",
1066 task_pid_nr(task), i, ctx->th_pmcs[i]));
1067 }
1068 ia64_srlz_d();
1069
1070
1071
1072
1073
1074 if (ctx->ctx_fl_using_dbreg) {
1075 pfm_restore_ibrs(ctx->ctx_ibrs, pmu_conf->num_ibrs);
1076 pfm_restore_dbrs(ctx->ctx_dbrs, pmu_conf->num_dbrs);
1077 }
1078
1079
1080
1081
1082 if (is_system && (PFM_CPUINFO_GET() & PFM_CPUINFO_DCR_PP)) {
1083
1084 ia64_setreg(_IA64_REG_CR_DCR, ia64_getreg(_IA64_REG_CR_DCR) | IA64_DCR_PP);
1085 ia64_srlz_i();
1086 }
1087 pfm_set_psr_l(psr);
1088}
1089
1090static inline void
1091pfm_save_pmds(unsigned long *pmds, unsigned long mask)
1092{
1093 int i;
1094
1095 ia64_srlz_d();
1096
1097 for (i=0; mask; i++, mask>>=1) {
1098 if (mask & 0x1) pmds[i] = ia64_get_pmd(i);
1099 }
1100}
1101
1102
1103
1104
1105static inline void
1106pfm_restore_pmds(unsigned long *pmds, unsigned long mask)
1107{
1108 int i;
1109 unsigned long val, ovfl_val = pmu_conf->ovfl_val;
1110
1111 for (i=0; mask; i++, mask>>=1) {
1112 if ((mask & 0x1) == 0) continue;
1113 val = PMD_IS_COUNTING(i) ? pmds[i] & ovfl_val : pmds[i];
1114 ia64_set_pmd(i, val);
1115 }
1116 ia64_srlz_d();
1117}
1118
1119
1120
1121
1122static inline void
1123pfm_copy_pmds(struct task_struct *task, pfm_context_t *ctx)
1124{
1125 unsigned long ovfl_val = pmu_conf->ovfl_val;
1126 unsigned long mask = ctx->ctx_all_pmds[0];
1127 unsigned long val;
1128 int i;
1129
1130 DPRINT(("mask=0x%lx\n", mask));
1131
1132 for (i=0; mask; i++, mask>>=1) {
1133
1134 val = ctx->ctx_pmds[i].val;
1135
1136
1137
1138
1139
1140
1141
1142 if (PMD_IS_COUNTING(i)) {
1143 ctx->ctx_pmds[i].val = val & ~ovfl_val;
1144 val &= ovfl_val;
1145 }
1146 ctx->th_pmds[i] = val;
1147
1148 DPRINT(("pmd[%d]=0x%lx soft_val=0x%lx\n",
1149 i,
1150 ctx->th_pmds[i],
1151 ctx->ctx_pmds[i].val));
1152 }
1153}
1154
1155
1156
1157
1158static inline void
1159pfm_copy_pmcs(struct task_struct *task, pfm_context_t *ctx)
1160{
1161 unsigned long mask = ctx->ctx_all_pmcs[0];
1162 int i;
1163
1164 DPRINT(("mask=0x%lx\n", mask));
1165
1166 for (i=0; mask; i++, mask>>=1) {
1167
1168 ctx->th_pmcs[i] = ctx->ctx_pmcs[i];
1169 DPRINT(("pmc[%d]=0x%lx\n", i, ctx->th_pmcs[i]));
1170 }
1171}
1172
1173
1174
1175static inline void
1176pfm_restore_pmcs(unsigned long *pmcs, unsigned long mask)
1177{
1178 int i;
1179
1180 for (i=0; mask; i++, mask>>=1) {
1181 if ((mask & 0x1) == 0) continue;
1182 ia64_set_pmc(i, pmcs[i]);
1183 }
1184 ia64_srlz_d();
1185}
1186
1187static inline int
1188pfm_uuid_cmp(pfm_uuid_t a, pfm_uuid_t b)
1189{
1190 return memcmp(a, b, sizeof(pfm_uuid_t));
1191}
1192
1193static inline int
1194pfm_buf_fmt_exit(pfm_buffer_fmt_t *fmt, struct task_struct *task, void *buf, struct pt_regs *regs)
1195{
1196 int ret = 0;
1197 if (fmt->fmt_exit) ret = (*fmt->fmt_exit)(task, buf, regs);
1198 return ret;
1199}
1200
1201static inline int
1202pfm_buf_fmt_getsize(pfm_buffer_fmt_t *fmt, struct task_struct *task, unsigned int flags, int cpu, void *arg, unsigned long *size)
1203{
1204 int ret = 0;
1205 if (fmt->fmt_getsize) ret = (*fmt->fmt_getsize)(task, flags, cpu, arg, size);
1206 return ret;
1207}
1208
1209
1210static inline int
1211pfm_buf_fmt_validate(pfm_buffer_fmt_t *fmt, struct task_struct *task, unsigned int flags,
1212 int cpu, void *arg)
1213{
1214 int ret = 0;
1215 if (fmt->fmt_validate) ret = (*fmt->fmt_validate)(task, flags, cpu, arg);
1216 return ret;
1217}
1218
1219static inline int
1220pfm_buf_fmt_init(pfm_buffer_fmt_t *fmt, struct task_struct *task, void *buf, unsigned int flags,
1221 int cpu, void *arg)
1222{
1223 int ret = 0;
1224 if (fmt->fmt_init) ret = (*fmt->fmt_init)(task, buf, flags, cpu, arg);
1225 return ret;
1226}
1227
1228static inline int
1229pfm_buf_fmt_restart(pfm_buffer_fmt_t *fmt, struct task_struct *task, pfm_ovfl_ctrl_t *ctrl, void *buf, struct pt_regs *regs)
1230{
1231 int ret = 0;
1232 if (fmt->fmt_restart) ret = (*fmt->fmt_restart)(task, ctrl, buf, regs);
1233 return ret;
1234}
1235
1236static inline int
1237pfm_buf_fmt_restart_active(pfm_buffer_fmt_t *fmt, struct task_struct *task, pfm_ovfl_ctrl_t *ctrl, void *buf, struct pt_regs *regs)
1238{
1239 int ret = 0;
1240 if (fmt->fmt_restart_active) ret = (*fmt->fmt_restart_active)(task, ctrl, buf, regs);
1241 return ret;
1242}
1243
1244static pfm_buffer_fmt_t *
1245__pfm_find_buffer_fmt(pfm_uuid_t uuid)
1246{
1247 struct list_head * pos;
1248 pfm_buffer_fmt_t * entry;
1249
1250 list_for_each(pos, &pfm_buffer_fmt_list) {
1251 entry = list_entry(pos, pfm_buffer_fmt_t, fmt_list);
1252 if (pfm_uuid_cmp(uuid, entry->fmt_uuid) == 0)
1253 return entry;
1254 }
1255 return NULL;
1256}
1257
1258
1259
1260
1261static pfm_buffer_fmt_t *
1262pfm_find_buffer_fmt(pfm_uuid_t uuid)
1263{
1264 pfm_buffer_fmt_t * fmt;
1265 spin_lock(&pfm_buffer_fmt_lock);
1266 fmt = __pfm_find_buffer_fmt(uuid);
1267 spin_unlock(&pfm_buffer_fmt_lock);
1268 return fmt;
1269}
1270
1271int
1272pfm_register_buffer_fmt(pfm_buffer_fmt_t *fmt)
1273{
1274 int ret = 0;
1275
1276
1277 if (fmt == NULL || fmt->fmt_name == NULL) return -EINVAL;
1278
1279
1280 if (fmt->fmt_handler == NULL) return -EINVAL;
1281
1282
1283
1284
1285
1286 spin_lock(&pfm_buffer_fmt_lock);
1287
1288 if (__pfm_find_buffer_fmt(fmt->fmt_uuid)) {
1289 printk(KERN_ERR "perfmon: duplicate sampling format: %s\n", fmt->fmt_name);
1290 ret = -EBUSY;
1291 goto out;
1292 }
1293 list_add(&fmt->fmt_list, &pfm_buffer_fmt_list);
1294 printk(KERN_INFO "perfmon: added sampling format %s\n", fmt->fmt_name);
1295
1296out:
1297 spin_unlock(&pfm_buffer_fmt_lock);
1298 return ret;
1299}
1300EXPORT_SYMBOL(pfm_register_buffer_fmt);
1301
1302int
1303pfm_unregister_buffer_fmt(pfm_uuid_t uuid)
1304{
1305 pfm_buffer_fmt_t *fmt;
1306 int ret = 0;
1307
1308 spin_lock(&pfm_buffer_fmt_lock);
1309
1310 fmt = __pfm_find_buffer_fmt(uuid);
1311 if (!fmt) {
1312 printk(KERN_ERR "perfmon: cannot unregister format, not found\n");
1313 ret = -EINVAL;
1314 goto out;
1315 }
1316 list_del_init(&fmt->fmt_list);
1317 printk(KERN_INFO "perfmon: removed sampling format: %s\n", fmt->fmt_name);
1318
1319out:
1320 spin_unlock(&pfm_buffer_fmt_lock);
1321 return ret;
1322
1323}
1324EXPORT_SYMBOL(pfm_unregister_buffer_fmt);
1325
1326static int
1327pfm_reserve_session(struct task_struct *task, int is_syswide, unsigned int cpu)
1328{
1329 unsigned long flags;
1330
1331
1332
1333 LOCK_PFS(flags);
1334
1335 DPRINT(("in sys_sessions=%u task_sessions=%u dbregs=%u syswide=%d cpu=%u\n",
1336 pfm_sessions.pfs_sys_sessions,
1337 pfm_sessions.pfs_task_sessions,
1338 pfm_sessions.pfs_sys_use_dbregs,
1339 is_syswide,
1340 cpu));
1341
1342 if (is_syswide) {
1343
1344
1345
1346 if (pfm_sessions.pfs_task_sessions > 0UL) {
1347 DPRINT(("system wide not possible, %u conflicting task_sessions\n",
1348 pfm_sessions.pfs_task_sessions));
1349 goto abort;
1350 }
1351
1352 if (pfm_sessions.pfs_sys_session[cpu]) goto error_conflict;
1353
1354 DPRINT(("reserving system wide session on CPU%u currently on CPU%u\n", cpu, smp_processor_id()));
1355
1356 pfm_sessions.pfs_sys_session[cpu] = task;
1357
1358 pfm_sessions.pfs_sys_sessions++ ;
1359
1360 } else {
1361 if (pfm_sessions.pfs_sys_sessions) goto abort;
1362 pfm_sessions.pfs_task_sessions++;
1363 }
1364
1365 DPRINT(("out sys_sessions=%u task_sessions=%u dbregs=%u syswide=%d cpu=%u\n",
1366 pfm_sessions.pfs_sys_sessions,
1367 pfm_sessions.pfs_task_sessions,
1368 pfm_sessions.pfs_sys_use_dbregs,
1369 is_syswide,
1370 cpu));
1371
1372
1373
1374
1375 cpu_idle_poll_ctrl(true);
1376
1377 UNLOCK_PFS(flags);
1378
1379 return 0;
1380
1381error_conflict:
1382 DPRINT(("system wide not possible, conflicting session [%d] on CPU%d\n",
1383 task_pid_nr(pfm_sessions.pfs_sys_session[cpu]),
1384 cpu));
1385abort:
1386 UNLOCK_PFS(flags);
1387
1388 return -EBUSY;
1389
1390}
1391
1392static int
1393pfm_unreserve_session(pfm_context_t *ctx, int is_syswide, unsigned int cpu)
1394{
1395 unsigned long flags;
1396
1397
1398
1399 LOCK_PFS(flags);
1400
1401 DPRINT(("in sys_sessions=%u task_sessions=%u dbregs=%u syswide=%d cpu=%u\n",
1402 pfm_sessions.pfs_sys_sessions,
1403 pfm_sessions.pfs_task_sessions,
1404 pfm_sessions.pfs_sys_use_dbregs,
1405 is_syswide,
1406 cpu));
1407
1408
1409 if (is_syswide) {
1410 pfm_sessions.pfs_sys_session[cpu] = NULL;
1411
1412
1413
1414 if (ctx && ctx->ctx_fl_using_dbreg) {
1415 if (pfm_sessions.pfs_sys_use_dbregs == 0) {
1416 printk(KERN_ERR "perfmon: invalid release for ctx %p sys_use_dbregs=0\n", ctx);
1417 } else {
1418 pfm_sessions.pfs_sys_use_dbregs--;
1419 }
1420 }
1421 pfm_sessions.pfs_sys_sessions--;
1422 } else {
1423 pfm_sessions.pfs_task_sessions--;
1424 }
1425 DPRINT(("out sys_sessions=%u task_sessions=%u dbregs=%u syswide=%d cpu=%u\n",
1426 pfm_sessions.pfs_sys_sessions,
1427 pfm_sessions.pfs_task_sessions,
1428 pfm_sessions.pfs_sys_use_dbregs,
1429 is_syswide,
1430 cpu));
1431
1432
1433 cpu_idle_poll_ctrl(false);
1434
1435 UNLOCK_PFS(flags);
1436
1437 return 0;
1438}
1439
1440
1441
1442
1443
1444
1445static int
1446pfm_remove_smpl_mapping(void *vaddr, unsigned long size)
1447{
1448 struct task_struct *task = current;
1449 int r;
1450
1451
1452 if (task->mm == NULL || size == 0UL || vaddr == NULL) {
1453 printk(KERN_ERR "perfmon: pfm_remove_smpl_mapping [%d] invalid context mm=%p\n", task_pid_nr(task), task->mm);
1454 return -EINVAL;
1455 }
1456
1457 DPRINT(("smpl_vaddr=%p size=%lu\n", vaddr, size));
1458
1459
1460
1461
1462 r = vm_munmap((unsigned long)vaddr, size);
1463
1464 if (r !=0) {
1465 printk(KERN_ERR "perfmon: [%d] unable to unmap sampling buffer @%p size=%lu\n", task_pid_nr(task), vaddr, size);
1466 }
1467
1468 DPRINT(("do_unmap(%p, %lu)=%d\n", vaddr, size, r));
1469
1470 return 0;
1471}
1472
1473
1474
1475
1476#if 0
1477static int
1478pfm_free_smpl_buffer(pfm_context_t *ctx)
1479{
1480 pfm_buffer_fmt_t *fmt;
1481
1482 if (ctx->ctx_smpl_hdr == NULL) goto invalid_free;
1483
1484
1485
1486
1487 fmt = ctx->ctx_buf_fmt;
1488
1489 DPRINT(("sampling buffer @%p size %lu vaddr=%p\n",
1490 ctx->ctx_smpl_hdr,
1491 ctx->ctx_smpl_size,
1492 ctx->ctx_smpl_vaddr));
1493
1494 pfm_buf_fmt_exit(fmt, current, NULL, NULL);
1495
1496
1497
1498
1499 pfm_rvfree(ctx->ctx_smpl_hdr, ctx->ctx_smpl_size);
1500
1501 ctx->ctx_smpl_hdr = NULL;
1502 ctx->ctx_smpl_size = 0UL;
1503
1504 return 0;
1505
1506invalid_free:
1507 printk(KERN_ERR "perfmon: pfm_free_smpl_buffer [%d] no buffer\n", task_pid_nr(current));
1508 return -EINVAL;
1509}
1510#endif
1511
1512static inline void
1513pfm_exit_smpl_buffer(pfm_buffer_fmt_t *fmt)
1514{
1515 if (fmt == NULL) return;
1516
1517 pfm_buf_fmt_exit(fmt, current, NULL, NULL);
1518
1519}
1520
1521
1522
1523
1524
1525
1526
1527static struct vfsmount *pfmfs_mnt __read_mostly;
1528
1529static int __init
1530init_pfm_fs(void)
1531{
1532 int err = register_filesystem(&pfm_fs_type);
1533 if (!err) {
1534 pfmfs_mnt = kern_mount(&pfm_fs_type);
1535 err = PTR_ERR(pfmfs_mnt);
1536 if (IS_ERR(pfmfs_mnt))
1537 unregister_filesystem(&pfm_fs_type);
1538 else
1539 err = 0;
1540 }
1541 return err;
1542}
1543
1544static ssize_t
1545pfm_read(struct file *filp, char __user *buf, size_t size, loff_t *ppos)
1546{
1547 pfm_context_t *ctx;
1548 pfm_msg_t *msg;
1549 ssize_t ret;
1550 unsigned long flags;
1551 DECLARE_WAITQUEUE(wait, current);
1552 if (PFM_IS_FILE(filp) == 0) {
1553 printk(KERN_ERR "perfmon: pfm_poll: bad magic [%d]\n", task_pid_nr(current));
1554 return -EINVAL;
1555 }
1556
1557 ctx = filp->private_data;
1558 if (ctx == NULL) {
1559 printk(KERN_ERR "perfmon: pfm_read: NULL ctx [%d]\n", task_pid_nr(current));
1560 return -EINVAL;
1561 }
1562
1563
1564
1565
1566 if (size < sizeof(pfm_msg_t)) {
1567 DPRINT(("message is too small ctx=%p (>=%ld)\n", ctx, sizeof(pfm_msg_t)));
1568 return -EINVAL;
1569 }
1570
1571 PROTECT_CTX(ctx, flags);
1572
1573
1574
1575
1576 add_wait_queue(&ctx->ctx_msgq_wait, &wait);
1577
1578
1579 for(;;) {
1580
1581
1582
1583
1584 set_current_state(TASK_INTERRUPTIBLE);
1585
1586 DPRINT(("head=%d tail=%d\n", ctx->ctx_msgq_head, ctx->ctx_msgq_tail));
1587
1588 ret = 0;
1589 if(PFM_CTXQ_EMPTY(ctx) == 0) break;
1590
1591 UNPROTECT_CTX(ctx, flags);
1592
1593
1594
1595
1596 ret = -EAGAIN;
1597 if(filp->f_flags & O_NONBLOCK) break;
1598
1599
1600
1601
1602 if(signal_pending(current)) {
1603 ret = -EINTR;
1604 break;
1605 }
1606
1607
1608
1609 schedule();
1610
1611 PROTECT_CTX(ctx, flags);
1612 }
1613 DPRINT(("[%d] back to running ret=%ld\n", task_pid_nr(current), ret));
1614 set_current_state(TASK_RUNNING);
1615 remove_wait_queue(&ctx->ctx_msgq_wait, &wait);
1616
1617 if (ret < 0) goto abort;
1618
1619 ret = -EINVAL;
1620 msg = pfm_get_next_msg(ctx);
1621 if (msg == NULL) {
1622 printk(KERN_ERR "perfmon: pfm_read no msg for ctx=%p [%d]\n", ctx, task_pid_nr(current));
1623 goto abort_locked;
1624 }
1625
1626 DPRINT(("fd=%d type=%d\n", msg->pfm_gen_msg.msg_ctx_fd, msg->pfm_gen_msg.msg_type));
1627
1628 ret = -EFAULT;
1629 if(copy_to_user(buf, msg, sizeof(pfm_msg_t)) == 0) ret = sizeof(pfm_msg_t);
1630
1631abort_locked:
1632 UNPROTECT_CTX(ctx, flags);
1633abort:
1634 return ret;
1635}
1636
1637static ssize_t
1638pfm_write(struct file *file, const char __user *ubuf,
1639 size_t size, loff_t *ppos)
1640{
1641 DPRINT(("pfm_write called\n"));
1642 return -EINVAL;
1643}
1644
1645static unsigned int
1646pfm_poll(struct file *filp, poll_table * wait)
1647{
1648 pfm_context_t *ctx;
1649 unsigned long flags;
1650 unsigned int mask = 0;
1651
1652 if (PFM_IS_FILE(filp) == 0) {
1653 printk(KERN_ERR "perfmon: pfm_poll: bad magic [%d]\n", task_pid_nr(current));
1654 return 0;
1655 }
1656
1657 ctx = filp->private_data;
1658 if (ctx == NULL) {
1659 printk(KERN_ERR "perfmon: pfm_poll: NULL ctx [%d]\n", task_pid_nr(current));
1660 return 0;
1661 }
1662
1663
1664 DPRINT(("pfm_poll ctx_fd=%d before poll_wait\n", ctx->ctx_fd));
1665
1666 poll_wait(filp, &ctx->ctx_msgq_wait, wait);
1667
1668 PROTECT_CTX(ctx, flags);
1669
1670 if (PFM_CTXQ_EMPTY(ctx) == 0)
1671 mask = POLLIN | POLLRDNORM;
1672
1673 UNPROTECT_CTX(ctx, flags);
1674
1675 DPRINT(("pfm_poll ctx_fd=%d mask=0x%x\n", ctx->ctx_fd, mask));
1676
1677 return mask;
1678}
1679
1680static long
1681pfm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1682{
1683 DPRINT(("pfm_ioctl called\n"));
1684 return -EINVAL;
1685}
1686
1687
1688
1689
1690static inline int
1691pfm_do_fasync(int fd, struct file *filp, pfm_context_t *ctx, int on)
1692{
1693 int ret;
1694
1695 ret = fasync_helper (fd, filp, on, &ctx->ctx_async_queue);
1696
1697 DPRINT(("pfm_fasync called by [%d] on ctx_fd=%d on=%d async_queue=%p ret=%d\n",
1698 task_pid_nr(current),
1699 fd,
1700 on,
1701 ctx->ctx_async_queue, ret));
1702
1703 return ret;
1704}
1705
1706static int
1707pfm_fasync(int fd, struct file *filp, int on)
1708{
1709 pfm_context_t *ctx;
1710 int ret;
1711
1712 if (PFM_IS_FILE(filp) == 0) {
1713 printk(KERN_ERR "perfmon: pfm_fasync bad magic [%d]\n", task_pid_nr(current));
1714 return -EBADF;
1715 }
1716
1717 ctx = filp->private_data;
1718 if (ctx == NULL) {
1719 printk(KERN_ERR "perfmon: pfm_fasync NULL ctx [%d]\n", task_pid_nr(current));
1720 return -EBADF;
1721 }
1722
1723
1724
1725
1726
1727
1728
1729 ret = pfm_do_fasync(fd, filp, ctx, on);
1730
1731
1732 DPRINT(("pfm_fasync called on ctx_fd=%d on=%d async_queue=%p ret=%d\n",
1733 fd,
1734 on,
1735 ctx->ctx_async_queue, ret));
1736
1737 return ret;
1738}
1739
1740#ifdef CONFIG_SMP
1741
1742
1743
1744
1745
1746static void
1747pfm_syswide_force_stop(void *info)
1748{
1749 pfm_context_t *ctx = (pfm_context_t *)info;
1750 struct pt_regs *regs = task_pt_regs(current);
1751 struct task_struct *owner;
1752 unsigned long flags;
1753 int ret;
1754
1755 if (ctx->ctx_cpu != smp_processor_id()) {
1756 printk(KERN_ERR "perfmon: pfm_syswide_force_stop for CPU%d but on CPU%d\n",
1757 ctx->ctx_cpu,
1758 smp_processor_id());
1759 return;
1760 }
1761 owner = GET_PMU_OWNER();
1762 if (owner != ctx->ctx_task) {
1763 printk(KERN_ERR "perfmon: pfm_syswide_force_stop CPU%d unexpected owner [%d] instead of [%d]\n",
1764 smp_processor_id(),
1765 task_pid_nr(owner), task_pid_nr(ctx->ctx_task));
1766 return;
1767 }
1768 if (GET_PMU_CTX() != ctx) {
1769 printk(KERN_ERR "perfmon: pfm_syswide_force_stop CPU%d unexpected ctx %p instead of %p\n",
1770 smp_processor_id(),
1771 GET_PMU_CTX(), ctx);
1772 return;
1773 }
1774
1775 DPRINT(("on CPU%d forcing system wide stop for [%d]\n", smp_processor_id(), task_pid_nr(ctx->ctx_task)));
1776
1777
1778
1779
1780
1781 local_irq_save(flags);
1782
1783 ret = pfm_context_unload(ctx, NULL, 0, regs);
1784 if (ret) {
1785 DPRINT(("context_unload returned %d\n", ret));
1786 }
1787
1788
1789
1790
1791 local_irq_restore(flags);
1792}
1793
1794static void
1795pfm_syswide_cleanup_other_cpu(pfm_context_t *ctx)
1796{
1797 int ret;
1798
1799 DPRINT(("calling CPU%d for cleanup\n", ctx->ctx_cpu));
1800 ret = smp_call_function_single(ctx->ctx_cpu, pfm_syswide_force_stop, ctx, 1);
1801 DPRINT(("called CPU%d for cleanup ret=%d\n", ctx->ctx_cpu, ret));
1802}
1803#endif
1804
1805
1806
1807
1808
1809static int
1810pfm_flush(struct file *filp, fl_owner_t id)
1811{
1812 pfm_context_t *ctx;
1813 struct task_struct *task;
1814 struct pt_regs *regs;
1815 unsigned long flags;
1816 unsigned long smpl_buf_size = 0UL;
1817 void *smpl_buf_vaddr = NULL;
1818 int state, is_system;
1819
1820 if (PFM_IS_FILE(filp) == 0) {
1821 DPRINT(("bad magic for\n"));
1822 return -EBADF;
1823 }
1824
1825 ctx = filp->private_data;
1826 if (ctx == NULL) {
1827 printk(KERN_ERR "perfmon: pfm_flush: NULL ctx [%d]\n", task_pid_nr(current));
1828 return -EBADF;
1829 }
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844 PROTECT_CTX(ctx, flags);
1845
1846 state = ctx->ctx_state;
1847 is_system = ctx->ctx_fl_system;
1848
1849 task = PFM_CTX_TASK(ctx);
1850 regs = task_pt_regs(task);
1851
1852 DPRINT(("ctx_state=%d is_current=%d\n",
1853 state,
1854 task == current ? 1 : 0));
1855
1856
1857
1858
1859
1860
1861
1862
1863 if (task == current) {
1864#ifdef CONFIG_SMP
1865
1866
1867
1868
1869
1870
1871
1872 if (is_system && ctx->ctx_cpu != smp_processor_id()) {
1873
1874 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
1875
1876
1877
1878 local_irq_restore(flags);
1879
1880 pfm_syswide_cleanup_other_cpu(ctx);
1881
1882
1883
1884
1885 local_irq_save(flags);
1886
1887
1888
1889
1890 } else
1891#endif
1892 {
1893
1894 DPRINT(("forcing unload\n"));
1895
1896
1897
1898
1899 pfm_context_unload(ctx, NULL, 0, regs);
1900
1901 DPRINT(("ctx_state=%d\n", ctx->ctx_state));
1902 }
1903 }
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916 if (ctx->ctx_smpl_vaddr && current->mm) {
1917 smpl_buf_vaddr = ctx->ctx_smpl_vaddr;
1918 smpl_buf_size = ctx->ctx_smpl_size;
1919 }
1920
1921 UNPROTECT_CTX(ctx, flags);
1922
1923
1924
1925
1926
1927
1928
1929 if (smpl_buf_vaddr) pfm_remove_smpl_mapping(smpl_buf_vaddr, smpl_buf_size);
1930
1931 return 0;
1932}
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948static int
1949pfm_close(struct inode *inode, struct file *filp)
1950{
1951 pfm_context_t *ctx;
1952 struct task_struct *task;
1953 struct pt_regs *regs;
1954 DECLARE_WAITQUEUE(wait, current);
1955 unsigned long flags;
1956 unsigned long smpl_buf_size = 0UL;
1957 void *smpl_buf_addr = NULL;
1958 int free_possible = 1;
1959 int state, is_system;
1960
1961 DPRINT(("pfm_close called private=%p\n", filp->private_data));
1962
1963 if (PFM_IS_FILE(filp) == 0) {
1964 DPRINT(("bad magic\n"));
1965 return -EBADF;
1966 }
1967
1968 ctx = filp->private_data;
1969 if (ctx == NULL) {
1970 printk(KERN_ERR "perfmon: pfm_close: NULL ctx [%d]\n", task_pid_nr(current));
1971 return -EBADF;
1972 }
1973
1974 PROTECT_CTX(ctx, flags);
1975
1976 state = ctx->ctx_state;
1977 is_system = ctx->ctx_fl_system;
1978
1979 task = PFM_CTX_TASK(ctx);
1980 regs = task_pt_regs(task);
1981
1982 DPRINT(("ctx_state=%d is_current=%d\n",
1983 state,
1984 task == current ? 1 : 0));
1985
1986
1987
1988
1989 if (state == PFM_CTX_UNLOADED) goto doit;
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003 if (state == PFM_CTX_MASKED && CTX_OVFL_NOBLOCK(ctx) == 0) {
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019 ctx->ctx_fl_going_zombie = 1;
2020
2021
2022
2023
2024 complete(&ctx->ctx_restart_done);
2025
2026 DPRINT(("waking up ctx_state=%d\n", state));
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036 set_current_state(TASK_INTERRUPTIBLE);
2037 add_wait_queue(&ctx->ctx_zombieq, &wait);
2038
2039 UNPROTECT_CTX(ctx, flags);
2040
2041
2042
2043
2044
2045
2046 schedule();
2047
2048
2049 PROTECT_CTX(ctx, flags);
2050
2051
2052 remove_wait_queue(&ctx->ctx_zombieq, &wait);
2053 set_current_state(TASK_RUNNING);
2054
2055
2056
2057
2058 DPRINT(("after zombie wakeup ctx_state=%d for\n", state));
2059 }
2060 else if (task != current) {
2061#ifdef CONFIG_SMP
2062
2063
2064
2065 ctx->ctx_state = PFM_CTX_ZOMBIE;
2066
2067 DPRINT(("zombie ctx for [%d]\n", task_pid_nr(task)));
2068
2069
2070
2071
2072 free_possible = 0;
2073#else
2074 pfm_context_unload(ctx, NULL, 0, regs);
2075#endif
2076 }
2077
2078doit:
2079
2080 state = ctx->ctx_state;
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096 if (ctx->ctx_smpl_hdr) {
2097 smpl_buf_addr = ctx->ctx_smpl_hdr;
2098 smpl_buf_size = ctx->ctx_smpl_size;
2099
2100 ctx->ctx_smpl_hdr = NULL;
2101 ctx->ctx_fl_is_sampling = 0;
2102 }
2103
2104 DPRINT(("ctx_state=%d free_possible=%d addr=%p size=%lu\n",
2105 state,
2106 free_possible,
2107 smpl_buf_addr,
2108 smpl_buf_size));
2109
2110 if (smpl_buf_addr) pfm_exit_smpl_buffer(ctx->ctx_buf_fmt);
2111
2112
2113
2114
2115 if (state == PFM_CTX_ZOMBIE) {
2116 pfm_unreserve_session(ctx, ctx->ctx_fl_system , ctx->ctx_cpu);
2117 }
2118
2119
2120
2121
2122
2123 filp->private_data = NULL;
2124
2125
2126
2127
2128
2129
2130
2131
2132 UNPROTECT_CTX(ctx, flags);
2133
2134
2135
2136
2137
2138 if (smpl_buf_addr) pfm_rvfree(smpl_buf_addr, smpl_buf_size);
2139
2140
2141
2142
2143 if (free_possible) pfm_context_free(ctx);
2144
2145 return 0;
2146}
2147
2148static const struct file_operations pfm_file_ops = {
2149 .llseek = no_llseek,
2150 .read = pfm_read,
2151 .write = pfm_write,
2152 .poll = pfm_poll,
2153 .unlocked_ioctl = pfm_ioctl,
2154 .fasync = pfm_fasync,
2155 .release = pfm_close,
2156 .flush = pfm_flush
2157};
2158
2159static char *pfmfs_dname(struct dentry *dentry, char *buffer, int buflen)
2160{
2161 return dynamic_dname(dentry, buffer, buflen, "pfm:[%lu]",
2162 d_inode(dentry)->i_ino);
2163}
2164
2165static const struct dentry_operations pfmfs_dentry_operations = {
2166 .d_delete = always_delete_dentry,
2167 .d_dname = pfmfs_dname,
2168};
2169
2170
2171static struct file *
2172pfm_alloc_file(pfm_context_t *ctx)
2173{
2174 struct file *file;
2175 struct inode *inode;
2176 struct path path;
2177 struct qstr this = { .name = "" };
2178
2179
2180
2181
2182 inode = new_inode(pfmfs_mnt->mnt_sb);
2183 if (!inode)
2184 return ERR_PTR(-ENOMEM);
2185
2186 DPRINT(("new inode ino=%ld @%p\n", inode->i_ino, inode));
2187
2188 inode->i_mode = S_IFCHR|S_IRUGO;
2189 inode->i_uid = current_fsuid();
2190 inode->i_gid = current_fsgid();
2191
2192
2193
2194
2195 path.dentry = d_alloc(pfmfs_mnt->mnt_root, &this);
2196 if (!path.dentry) {
2197 iput(inode);
2198 return ERR_PTR(-ENOMEM);
2199 }
2200 path.mnt = mntget(pfmfs_mnt);
2201
2202 d_add(path.dentry, inode);
2203
2204 file = alloc_file(&path, FMODE_READ, &pfm_file_ops);
2205 if (IS_ERR(file)) {
2206 path_put(&path);
2207 return file;
2208 }
2209
2210 file->f_flags = O_RDONLY;
2211 file->private_data = ctx;
2212
2213 return file;
2214}
2215
2216static int
2217pfm_remap_buffer(struct vm_area_struct *vma, unsigned long buf, unsigned long addr, unsigned long size)
2218{
2219 DPRINT(("CPU%d buf=0x%lx addr=0x%lx size=%ld\n", smp_processor_id(), buf, addr, size));
2220
2221 while (size > 0) {
2222 unsigned long pfn = ia64_tpa(buf) >> PAGE_SHIFT;
2223
2224
2225 if (remap_pfn_range(vma, addr, pfn, PAGE_SIZE, PAGE_READONLY))
2226 return -ENOMEM;
2227
2228 addr += PAGE_SIZE;
2229 buf += PAGE_SIZE;
2230 size -= PAGE_SIZE;
2231 }
2232 return 0;
2233}
2234
2235
2236
2237
2238static int
2239pfm_smpl_buffer_alloc(struct task_struct *task, struct file *filp, pfm_context_t *ctx, unsigned long rsize, void **user_vaddr)
2240{
2241 struct mm_struct *mm = task->mm;
2242 struct vm_area_struct *vma = NULL;
2243 unsigned long size;
2244 void *smpl_buf;
2245
2246
2247
2248
2249
2250 size = PAGE_ALIGN(rsize);
2251
2252 DPRINT(("sampling buffer rsize=%lu size=%lu bytes\n", rsize, size));
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262 if (size > task_rlimit(task, RLIMIT_MEMLOCK))
2263 return -ENOMEM;
2264
2265
2266
2267
2268
2269
2270 smpl_buf = pfm_rvmalloc(size);
2271 if (smpl_buf == NULL) {
2272 DPRINT(("Can't allocate sampling buffer\n"));
2273 return -ENOMEM;
2274 }
2275
2276 DPRINT(("smpl_buf @%p\n", smpl_buf));
2277
2278
2279 vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
2280 if (!vma) {
2281 DPRINT(("Cannot allocate vma\n"));
2282 goto error_kmem;
2283 }
2284 INIT_LIST_HEAD(&vma->anon_vma_chain);
2285
2286
2287
2288
2289 vma->vm_mm = mm;
2290 vma->vm_file = get_file(filp);
2291 vma->vm_flags = VM_READ|VM_MAYREAD|VM_DONTEXPAND|VM_DONTDUMP;
2292 vma->vm_page_prot = PAGE_READONLY;
2293
2294
2295
2296
2297
2298
2299 ctx->ctx_smpl_hdr = smpl_buf;
2300 ctx->ctx_smpl_size = size;
2301
2302
2303
2304
2305
2306
2307
2308 down_write(&task->mm->mmap_sem);
2309
2310
2311 vma->vm_start = get_unmapped_area(NULL, 0, size, 0, MAP_PRIVATE|MAP_ANONYMOUS);
2312 if (IS_ERR_VALUE(vma->vm_start)) {
2313 DPRINT(("Cannot find unmapped area for size %ld\n", size));
2314 up_write(&task->mm->mmap_sem);
2315 goto error;
2316 }
2317 vma->vm_end = vma->vm_start + size;
2318 vma->vm_pgoff = vma->vm_start >> PAGE_SHIFT;
2319
2320 DPRINT(("aligned size=%ld, hdr=%p mapped @0x%lx\n", size, ctx->ctx_smpl_hdr, vma->vm_start));
2321
2322
2323 if (pfm_remap_buffer(vma, (unsigned long)smpl_buf, vma->vm_start, size)) {
2324 DPRINT(("Can't remap buffer\n"));
2325 up_write(&task->mm->mmap_sem);
2326 goto error;
2327 }
2328
2329
2330
2331
2332
2333 insert_vm_struct(mm, vma);
2334
2335 vm_stat_account(vma->vm_mm, vma->vm_flags, vma->vm_file,
2336 vma_pages(vma));
2337 up_write(&task->mm->mmap_sem);
2338
2339
2340
2341
2342 ctx->ctx_smpl_vaddr = (void *)vma->vm_start;
2343 *(unsigned long *)user_vaddr = vma->vm_start;
2344
2345 return 0;
2346
2347error:
2348 kmem_cache_free(vm_area_cachep, vma);
2349error_kmem:
2350 pfm_rvfree(smpl_buf, size);
2351
2352 return -ENOMEM;
2353}
2354
2355
2356
2357
2358static int
2359pfm_bad_permissions(struct task_struct *task)
2360{
2361 const struct cred *tcred;
2362 kuid_t uid = current_uid();
2363 kgid_t gid = current_gid();
2364 int ret;
2365
2366 rcu_read_lock();
2367 tcred = __task_cred(task);
2368
2369
2370 DPRINT(("cur: uid=%d gid=%d task: euid=%d suid=%d uid=%d egid=%d sgid=%d\n",
2371 from_kuid(&init_user_ns, uid),
2372 from_kgid(&init_user_ns, gid),
2373 from_kuid(&init_user_ns, tcred->euid),
2374 from_kuid(&init_user_ns, tcred->suid),
2375 from_kuid(&init_user_ns, tcred->uid),
2376 from_kgid(&init_user_ns, tcred->egid),
2377 from_kgid(&init_user_ns, tcred->sgid)));
2378
2379 ret = ((!uid_eq(uid, tcred->euid))
2380 || (!uid_eq(uid, tcred->suid))
2381 || (!uid_eq(uid, tcred->uid))
2382 || (!gid_eq(gid, tcred->egid))
2383 || (!gid_eq(gid, tcred->sgid))
2384 || (!gid_eq(gid, tcred->gid))) && !capable(CAP_SYS_PTRACE);
2385
2386 rcu_read_unlock();
2387 return ret;
2388}
2389
2390static int
2391pfarg_is_sane(struct task_struct *task, pfarg_context_t *pfx)
2392{
2393 int ctx_flags;
2394
2395
2396
2397 ctx_flags = pfx->ctx_flags;
2398
2399 if (ctx_flags & PFM_FL_SYSTEM_WIDE) {
2400
2401
2402
2403
2404 if (ctx_flags & PFM_FL_NOTIFY_BLOCK) {
2405 DPRINT(("cannot use blocking mode when in system wide monitoring\n"));
2406 return -EINVAL;
2407 }
2408 } else {
2409 }
2410
2411
2412 return 0;
2413}
2414
2415static int
2416pfm_setup_buffer_fmt(struct task_struct *task, struct file *filp, pfm_context_t *ctx, unsigned int ctx_flags,
2417 unsigned int cpu, pfarg_context_t *arg)
2418{
2419 pfm_buffer_fmt_t *fmt = NULL;
2420 unsigned long size = 0UL;
2421 void *uaddr = NULL;
2422 void *fmt_arg = NULL;
2423 int ret = 0;
2424#define PFM_CTXARG_BUF_ARG(a) (pfm_buffer_fmt_t *)(a+1)
2425
2426
2427 fmt = pfm_find_buffer_fmt(arg->ctx_smpl_buf_id);
2428 if (fmt == NULL) {
2429 DPRINT(("[%d] cannot find buffer format\n", task_pid_nr(task)));
2430 return -EINVAL;
2431 }
2432
2433
2434
2435
2436 if (fmt->fmt_arg_size) fmt_arg = PFM_CTXARG_BUF_ARG(arg);
2437
2438 ret = pfm_buf_fmt_validate(fmt, task, ctx_flags, cpu, fmt_arg);
2439
2440 DPRINT(("[%d] after validate(0x%x,%d,%p)=%d\n", task_pid_nr(task), ctx_flags, cpu, fmt_arg, ret));
2441
2442 if (ret) goto error;
2443
2444
2445 ctx->ctx_buf_fmt = fmt;
2446 ctx->ctx_fl_is_sampling = 1;
2447
2448
2449
2450
2451 ret = pfm_buf_fmt_getsize(fmt, task, ctx_flags, cpu, fmt_arg, &size);
2452 if (ret) goto error;
2453
2454 if (size) {
2455
2456
2457
2458 ret = pfm_smpl_buffer_alloc(current, filp, ctx, size, &uaddr);
2459 if (ret) goto error;
2460
2461
2462 arg->ctx_smpl_vaddr = uaddr;
2463 }
2464 ret = pfm_buf_fmt_init(fmt, task, ctx->ctx_smpl_hdr, ctx_flags, cpu, fmt_arg);
2465
2466error:
2467 return ret;
2468}
2469
2470static void
2471pfm_reset_pmu_state(pfm_context_t *ctx)
2472{
2473 int i;
2474
2475
2476
2477
2478 for (i=1; PMC_IS_LAST(i) == 0; i++) {
2479 if (PMC_IS_IMPL(i) == 0) continue;
2480 ctx->ctx_pmcs[i] = PMC_DFL_VAL(i);
2481 DPRINT(("pmc[%d]=0x%lx\n", i, ctx->ctx_pmcs[i]));
2482 }
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510 ctx->ctx_all_pmcs[0] = pmu_conf->impl_pmcs[0] & ~0x1;
2511
2512
2513
2514
2515 ctx->ctx_all_pmds[0] = pmu_conf->impl_pmds[0];
2516
2517 DPRINT(("<%d> all_pmcs=0x%lx all_pmds=0x%lx\n", ctx->ctx_fd, ctx->ctx_all_pmcs[0],ctx->ctx_all_pmds[0]));
2518
2519
2520
2521
2522 ctx->ctx_used_ibrs[0] = 0UL;
2523 ctx->ctx_used_dbrs[0] = 0UL;
2524}
2525
2526static int
2527pfm_ctx_getsize(void *arg, size_t *sz)
2528{
2529 pfarg_context_t *req = (pfarg_context_t *)arg;
2530 pfm_buffer_fmt_t *fmt;
2531
2532 *sz = 0;
2533
2534 if (!pfm_uuid_cmp(req->ctx_smpl_buf_id, pfm_null_uuid)) return 0;
2535
2536 fmt = pfm_find_buffer_fmt(req->ctx_smpl_buf_id);
2537 if (fmt == NULL) {
2538 DPRINT(("cannot find buffer format\n"));
2539 return -EINVAL;
2540 }
2541
2542 *sz = fmt->fmt_arg_size;
2543 DPRINT(("arg_size=%lu\n", *sz));
2544
2545 return 0;
2546}
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556static int
2557pfm_task_incompatible(pfm_context_t *ctx, struct task_struct *task)
2558{
2559
2560
2561
2562 if (task->mm == NULL) {
2563 DPRINT(("task [%d] has not memory context (kernel thread)\n", task_pid_nr(task)));
2564 return -EPERM;
2565 }
2566 if (pfm_bad_permissions(task)) {
2567 DPRINT(("no permission to attach to [%d]\n", task_pid_nr(task)));
2568 return -EPERM;
2569 }
2570
2571
2572
2573 if (CTX_OVFL_NOBLOCK(ctx) == 0 && task == current) {
2574 DPRINT(("cannot load a blocking context on self for [%d]\n", task_pid_nr(task)));
2575 return -EINVAL;
2576 }
2577
2578 if (task->exit_state == EXIT_ZOMBIE) {
2579 DPRINT(("cannot attach to zombie task [%d]\n", task_pid_nr(task)));
2580 return -EBUSY;
2581 }
2582
2583
2584
2585
2586 if (task == current) return 0;
2587
2588 if (!task_is_stopped_or_traced(task)) {
2589 DPRINT(("cannot attach to non-stopped task [%d] state=%ld\n", task_pid_nr(task), task->state));
2590 return -EBUSY;
2591 }
2592
2593
2594
2595 wait_task_inactive(task, 0);
2596
2597
2598
2599 return 0;
2600}
2601
2602static int
2603pfm_get_task(pfm_context_t *ctx, pid_t pid, struct task_struct **task)
2604{
2605 struct task_struct *p = current;
2606 int ret;
2607
2608
2609 if (pid < 2) return -EPERM;
2610
2611 if (pid != task_pid_vnr(current)) {
2612
2613 read_lock(&tasklist_lock);
2614
2615 p = find_task_by_vpid(pid);
2616
2617
2618 if (p) get_task_struct(p);
2619
2620 read_unlock(&tasklist_lock);
2621
2622 if (p == NULL) return -ESRCH;
2623 }
2624
2625 ret = pfm_task_incompatible(ctx, p);
2626 if (ret == 0) {
2627 *task = p;
2628 } else if (p != current) {
2629 pfm_put_task(p);
2630 }
2631 return ret;
2632}
2633
2634
2635
2636static int
2637pfm_context_create(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
2638{
2639 pfarg_context_t *req = (pfarg_context_t *)arg;
2640 struct file *filp;
2641 struct path path;
2642 int ctx_flags;
2643 int fd;
2644 int ret;
2645
2646
2647 ret = pfarg_is_sane(current, req);
2648 if (ret < 0)
2649 return ret;
2650
2651 ctx_flags = req->ctx_flags;
2652
2653 ret = -ENOMEM;
2654
2655 fd = get_unused_fd_flags(0);
2656 if (fd < 0)
2657 return fd;
2658
2659 ctx = pfm_context_alloc(ctx_flags);
2660 if (!ctx)
2661 goto error;
2662
2663 filp = pfm_alloc_file(ctx);
2664 if (IS_ERR(filp)) {
2665 ret = PTR_ERR(filp);
2666 goto error_file;
2667 }
2668
2669 req->ctx_fd = ctx->ctx_fd = fd;
2670
2671
2672
2673
2674 if (pfm_uuid_cmp(req->ctx_smpl_buf_id, pfm_null_uuid)) {
2675 ret = pfm_setup_buffer_fmt(current, filp, ctx, ctx_flags, 0, req);
2676 if (ret)
2677 goto buffer_error;
2678 }
2679
2680 DPRINT(("ctx=%p flags=0x%x system=%d notify_block=%d excl_idle=%d no_msg=%d ctx_fd=%d\n",
2681 ctx,
2682 ctx_flags,
2683 ctx->ctx_fl_system,
2684 ctx->ctx_fl_block,
2685 ctx->ctx_fl_excl_idle,
2686 ctx->ctx_fl_no_msg,
2687 ctx->ctx_fd));
2688
2689
2690
2691
2692 pfm_reset_pmu_state(ctx);
2693
2694 fd_install(fd, filp);
2695
2696 return 0;
2697
2698buffer_error:
2699 path = filp->f_path;
2700 put_filp(filp);
2701 path_put(&path);
2702
2703 if (ctx->ctx_buf_fmt) {
2704 pfm_buf_fmt_exit(ctx->ctx_buf_fmt, current, NULL, regs);
2705 }
2706error_file:
2707 pfm_context_free(ctx);
2708
2709error:
2710 put_unused_fd(fd);
2711 return ret;
2712}
2713
2714static inline unsigned long
2715pfm_new_counter_value (pfm_counter_t *reg, int is_long_reset)
2716{
2717 unsigned long val = is_long_reset ? reg->long_reset : reg->short_reset;
2718 unsigned long new_seed, old_seed = reg->seed, mask = reg->mask;
2719 extern unsigned long carta_random32 (unsigned long seed);
2720
2721 if (reg->flags & PFM_REGFL_RANDOM) {
2722 new_seed = carta_random32(old_seed);
2723 val -= (old_seed & mask);
2724 if ((mask >> 32) != 0)
2725
2726 new_seed |= carta_random32(old_seed >> 32) << 32;
2727 reg->seed = new_seed;
2728 }
2729 reg->lval = val;
2730 return val;
2731}
2732
2733static void
2734pfm_reset_regs_masked(pfm_context_t *ctx, unsigned long *ovfl_regs, int is_long_reset)
2735{
2736 unsigned long mask = ovfl_regs[0];
2737 unsigned long reset_others = 0UL;
2738 unsigned long val;
2739 int i;
2740
2741
2742
2743
2744 mask >>= PMU_FIRST_COUNTER;
2745 for(i = PMU_FIRST_COUNTER; mask; i++, mask >>= 1) {
2746
2747 if ((mask & 0x1UL) == 0UL) continue;
2748
2749 ctx->ctx_pmds[i].val = val = pfm_new_counter_value(ctx->ctx_pmds+ i, is_long_reset);
2750 reset_others |= ctx->ctx_pmds[i].reset_pmds[0];
2751
2752 DPRINT_ovfl((" %s reset ctx_pmds[%d]=%lx\n", is_long_reset ? "long" : "short", i, val));
2753 }
2754
2755
2756
2757
2758 for(i = 0; reset_others; i++, reset_others >>= 1) {
2759
2760 if ((reset_others & 0x1) == 0) continue;
2761
2762 ctx->ctx_pmds[i].val = val = pfm_new_counter_value(ctx->ctx_pmds + i, is_long_reset);
2763
2764 DPRINT_ovfl(("%s reset_others pmd[%d]=%lx\n",
2765 is_long_reset ? "long" : "short", i, val));
2766 }
2767}
2768
2769static void
2770pfm_reset_regs(pfm_context_t *ctx, unsigned long *ovfl_regs, int is_long_reset)
2771{
2772 unsigned long mask = ovfl_regs[0];
2773 unsigned long reset_others = 0UL;
2774 unsigned long val;
2775 int i;
2776
2777 DPRINT_ovfl(("ovfl_regs=0x%lx is_long_reset=%d\n", ovfl_regs[0], is_long_reset));
2778
2779 if (ctx->ctx_state == PFM_CTX_MASKED) {
2780 pfm_reset_regs_masked(ctx, ovfl_regs, is_long_reset);
2781 return;
2782 }
2783
2784
2785
2786
2787 mask >>= PMU_FIRST_COUNTER;
2788 for(i = PMU_FIRST_COUNTER; mask; i++, mask >>= 1) {
2789
2790 if ((mask & 0x1UL) == 0UL) continue;
2791
2792 val = pfm_new_counter_value(ctx->ctx_pmds+ i, is_long_reset);
2793 reset_others |= ctx->ctx_pmds[i].reset_pmds[0];
2794
2795 DPRINT_ovfl((" %s reset ctx_pmds[%d]=%lx\n", is_long_reset ? "long" : "short", i, val));
2796
2797 pfm_write_soft_counter(ctx, i, val);
2798 }
2799
2800
2801
2802
2803 for(i = 0; reset_others; i++, reset_others >>= 1) {
2804
2805 if ((reset_others & 0x1) == 0) continue;
2806
2807 val = pfm_new_counter_value(ctx->ctx_pmds + i, is_long_reset);
2808
2809 if (PMD_IS_COUNTING(i)) {
2810 pfm_write_soft_counter(ctx, i, val);
2811 } else {
2812 ia64_set_pmd(i, val);
2813 }
2814 DPRINT_ovfl(("%s reset_others pmd[%d]=%lx\n",
2815 is_long_reset ? "long" : "short", i, val));
2816 }
2817 ia64_srlz_d();
2818}
2819
2820static int
2821pfm_write_pmcs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
2822{
2823 struct task_struct *task;
2824 pfarg_reg_t *req = (pfarg_reg_t *)arg;
2825 unsigned long value, pmc_pm;
2826 unsigned long smpl_pmds, reset_pmds, impl_pmds;
2827 unsigned int cnum, reg_flags, flags, pmc_type;
2828 int i, can_access_pmu = 0, is_loaded, is_system, expert_mode;
2829 int is_monitor, is_counting, state;
2830 int ret = -EINVAL;
2831 pfm_reg_check_t wr_func;
2832#define PFM_CHECK_PMC_PM(x, y, z) ((x)->ctx_fl_system ^ PMC_PM(y, z))
2833
2834 state = ctx->ctx_state;
2835 is_loaded = state == PFM_CTX_LOADED ? 1 : 0;
2836 is_system = ctx->ctx_fl_system;
2837 task = ctx->ctx_task;
2838 impl_pmds = pmu_conf->impl_pmds[0];
2839
2840 if (state == PFM_CTX_ZOMBIE) return -EINVAL;
2841
2842 if (is_loaded) {
2843
2844
2845
2846
2847
2848 if (is_system && ctx->ctx_cpu != smp_processor_id()) {
2849 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
2850 return -EBUSY;
2851 }
2852 can_access_pmu = GET_PMU_OWNER() == task || is_system ? 1 : 0;
2853 }
2854 expert_mode = pfm_sysctl.expert_mode;
2855
2856 for (i = 0; i < count; i++, req++) {
2857
2858 cnum = req->reg_num;
2859 reg_flags = req->reg_flags;
2860 value = req->reg_value;
2861 smpl_pmds = req->reg_smpl_pmds[0];
2862 reset_pmds = req->reg_reset_pmds[0];
2863 flags = 0;
2864
2865
2866 if (cnum >= PMU_MAX_PMCS) {
2867 DPRINT(("pmc%u is invalid\n", cnum));
2868 goto error;
2869 }
2870
2871 pmc_type = pmu_conf->pmc_desc[cnum].type;
2872 pmc_pm = (value >> pmu_conf->pmc_desc[cnum].pm_pos) & 0x1;
2873 is_counting = (pmc_type & PFM_REG_COUNTING) == PFM_REG_COUNTING ? 1 : 0;
2874 is_monitor = (pmc_type & PFM_REG_MONITOR) == PFM_REG_MONITOR ? 1 : 0;
2875
2876
2877
2878
2879
2880
2881 if ((pmc_type & PFM_REG_IMPL) == 0 || (pmc_type & PFM_REG_CONTROL) == PFM_REG_CONTROL) {
2882 DPRINT(("pmc%u is unimplemented or no-access pmc_type=%x\n", cnum, pmc_type));
2883 goto error;
2884 }
2885 wr_func = pmu_conf->pmc_desc[cnum].write_check;
2886
2887
2888
2889
2890
2891 if (is_monitor && value != PMC_DFL_VAL(cnum) && is_system ^ pmc_pm) {
2892 DPRINT(("pmc%u pmc_pm=%lu is_system=%d\n",
2893 cnum,
2894 pmc_pm,
2895 is_system));
2896 goto error;
2897 }
2898
2899 if (is_counting) {
2900
2901
2902
2903
2904 value |= 1 << PMU_PMC_OI;
2905
2906 if (reg_flags & PFM_REGFL_OVFL_NOTIFY) {
2907 flags |= PFM_REGFL_OVFL_NOTIFY;
2908 }
2909
2910 if (reg_flags & PFM_REGFL_RANDOM) flags |= PFM_REGFL_RANDOM;
2911
2912
2913 if ((smpl_pmds & impl_pmds) != smpl_pmds) {
2914 DPRINT(("invalid smpl_pmds 0x%lx for pmc%u\n", smpl_pmds, cnum));
2915 goto error;
2916 }
2917
2918
2919 if ((reset_pmds & impl_pmds) != reset_pmds) {
2920 DPRINT(("invalid reset_pmds 0x%lx for pmc%u\n", reset_pmds, cnum));
2921 goto error;
2922 }
2923 } else {
2924 if (reg_flags & (PFM_REGFL_OVFL_NOTIFY|PFM_REGFL_RANDOM)) {
2925 DPRINT(("cannot set ovfl_notify or random on pmc%u\n", cnum));
2926 goto error;
2927 }
2928
2929 }
2930
2931
2932
2933
2934 if (likely(expert_mode == 0 && wr_func)) {
2935 ret = (*wr_func)(task, ctx, cnum, &value, regs);
2936 if (ret) goto error;
2937 ret = -EINVAL;
2938 }
2939
2940
2941
2942
2943 PFM_REG_RETFLAG_SET(req->reg_flags, 0);
2944
2945
2946
2947
2948
2949
2950
2951
2952 if (is_counting) {
2953
2954
2955
2956 ctx->ctx_pmds[cnum].flags = flags;
2957
2958 ctx->ctx_pmds[cnum].reset_pmds[0] = reset_pmds;
2959 ctx->ctx_pmds[cnum].smpl_pmds[0] = smpl_pmds;
2960 ctx->ctx_pmds[cnum].eventid = req->reg_smpl_eventid;
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973 CTX_USED_PMD(ctx, reset_pmds);
2974 CTX_USED_PMD(ctx, smpl_pmds);
2975
2976
2977
2978
2979 if (state == PFM_CTX_MASKED) ctx->ctx_ovfl_regs[0] &= ~1UL << cnum;
2980 }
2981
2982
2983
2984
2985
2986 CTX_USED_PMD(ctx, pmu_conf->pmc_desc[cnum].dep_pmd[0]);
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000 if (is_monitor) CTX_USED_MONITOR(ctx, 1UL << cnum);
3001
3002
3003
3004
3005 ctx->ctx_pmcs[cnum] = value;
3006
3007 if (is_loaded) {
3008
3009
3010
3011 if (is_system == 0) ctx->th_pmcs[cnum] = value;
3012
3013
3014
3015
3016 if (can_access_pmu) {
3017 ia64_set_pmc(cnum, value);
3018 }
3019#ifdef CONFIG_SMP
3020 else {
3021
3022
3023
3024
3025
3026
3027
3028 ctx->ctx_reload_pmcs[0] |= 1UL << cnum;
3029 }
3030#endif
3031 }
3032
3033 DPRINT(("pmc[%u]=0x%lx ld=%d apmu=%d flags=0x%x all_pmcs=0x%lx used_pmds=0x%lx eventid=%ld smpl_pmds=0x%lx reset_pmds=0x%lx reloads_pmcs=0x%lx used_monitors=0x%lx ovfl_regs=0x%lx\n",
3034 cnum,
3035 value,
3036 is_loaded,
3037 can_access_pmu,
3038 flags,
3039 ctx->ctx_all_pmcs[0],
3040 ctx->ctx_used_pmds[0],
3041 ctx->ctx_pmds[cnum].eventid,
3042 smpl_pmds,
3043 reset_pmds,
3044 ctx->ctx_reload_pmcs[0],
3045 ctx->ctx_used_monitors[0],
3046 ctx->ctx_ovfl_regs[0]));
3047 }
3048
3049
3050
3051
3052 if (can_access_pmu) ia64_srlz_d();
3053
3054 return 0;
3055error:
3056 PFM_REG_RETFLAG_SET(req->reg_flags, PFM_REG_RETFL_EINVAL);
3057 return ret;
3058}
3059
3060static int
3061pfm_write_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3062{
3063 struct task_struct *task;
3064 pfarg_reg_t *req = (pfarg_reg_t *)arg;
3065 unsigned long value, hw_value, ovfl_mask;
3066 unsigned int cnum;
3067 int i, can_access_pmu = 0, state;
3068 int is_counting, is_loaded, is_system, expert_mode;
3069 int ret = -EINVAL;
3070 pfm_reg_check_t wr_func;
3071
3072
3073 state = ctx->ctx_state;
3074 is_loaded = state == PFM_CTX_LOADED ? 1 : 0;
3075 is_system = ctx->ctx_fl_system;
3076 ovfl_mask = pmu_conf->ovfl_val;
3077 task = ctx->ctx_task;
3078
3079 if (unlikely(state == PFM_CTX_ZOMBIE)) return -EINVAL;
3080
3081
3082
3083
3084
3085 if (likely(is_loaded)) {
3086
3087
3088
3089
3090
3091 if (unlikely(is_system && ctx->ctx_cpu != smp_processor_id())) {
3092 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
3093 return -EBUSY;
3094 }
3095 can_access_pmu = GET_PMU_OWNER() == task || is_system ? 1 : 0;
3096 }
3097 expert_mode = pfm_sysctl.expert_mode;
3098
3099 for (i = 0; i < count; i++, req++) {
3100
3101 cnum = req->reg_num;
3102 value = req->reg_value;
3103
3104 if (!PMD_IS_IMPL(cnum)) {
3105 DPRINT(("pmd[%u] is unimplemented or invalid\n", cnum));
3106 goto abort_mission;
3107 }
3108 is_counting = PMD_IS_COUNTING(cnum);
3109 wr_func = pmu_conf->pmd_desc[cnum].write_check;
3110
3111
3112
3113
3114 if (unlikely(expert_mode == 0 && wr_func)) {
3115 unsigned long v = value;
3116
3117 ret = (*wr_func)(task, ctx, cnum, &v, regs);
3118 if (ret) goto abort_mission;
3119
3120 value = v;
3121 ret = -EINVAL;
3122 }
3123
3124
3125
3126
3127 PFM_REG_RETFLAG_SET(req->reg_flags, 0);
3128
3129
3130
3131
3132 hw_value = value;
3133
3134
3135
3136
3137 if (is_counting) {
3138
3139
3140
3141 ctx->ctx_pmds[cnum].lval = value;
3142
3143
3144
3145
3146 if (is_loaded) {
3147 hw_value = value & ovfl_mask;
3148 value = value & ~ovfl_mask;
3149 }
3150 }
3151
3152
3153
3154 ctx->ctx_pmds[cnum].long_reset = req->reg_long_reset;
3155 ctx->ctx_pmds[cnum].short_reset = req->reg_short_reset;
3156
3157
3158
3159
3160 ctx->ctx_pmds[cnum].seed = req->reg_random_seed;
3161 ctx->ctx_pmds[cnum].mask = req->reg_random_mask;
3162
3163
3164
3165
3166 ctx->ctx_pmds[cnum].val = value;
3167
3168
3169
3170
3171
3172
3173
3174 CTX_USED_PMD(ctx, PMD_PMD_DEP(cnum));
3175
3176
3177
3178
3179 CTX_USED_PMD(ctx, RDEP(cnum));
3180
3181
3182
3183
3184
3185 if (is_counting && state == PFM_CTX_MASKED) {
3186 ctx->ctx_ovfl_regs[0] &= ~1UL << cnum;
3187 }
3188
3189 if (is_loaded) {
3190
3191
3192
3193 if (is_system == 0) ctx->th_pmds[cnum] = hw_value;
3194
3195
3196
3197
3198 if (can_access_pmu) {
3199 ia64_set_pmd(cnum, hw_value);
3200 } else {
3201#ifdef CONFIG_SMP
3202
3203
3204
3205
3206
3207 ctx->ctx_reload_pmds[0] |= 1UL << cnum;
3208#endif
3209 }
3210 }
3211
3212 DPRINT(("pmd[%u]=0x%lx ld=%d apmu=%d, hw_value=0x%lx ctx_pmd=0x%lx short_reset=0x%lx "
3213 "long_reset=0x%lx notify=%c seed=0x%lx mask=0x%lx used_pmds=0x%lx reset_pmds=0x%lx reload_pmds=0x%lx all_pmds=0x%lx ovfl_regs=0x%lx\n",
3214 cnum,
3215 value,
3216 is_loaded,
3217 can_access_pmu,
3218 hw_value,
3219 ctx->ctx_pmds[cnum].val,
3220 ctx->ctx_pmds[cnum].short_reset,
3221 ctx->ctx_pmds[cnum].long_reset,
3222 PMC_OVFL_NOTIFY(ctx, cnum) ? 'Y':'N',
3223 ctx->ctx_pmds[cnum].seed,
3224 ctx->ctx_pmds[cnum].mask,
3225 ctx->ctx_used_pmds[0],
3226 ctx->ctx_pmds[cnum].reset_pmds[0],
3227 ctx->ctx_reload_pmds[0],
3228 ctx->ctx_all_pmds[0],
3229 ctx->ctx_ovfl_regs[0]));
3230 }
3231
3232
3233
3234
3235 if (can_access_pmu) ia64_srlz_d();
3236
3237 return 0;
3238
3239abort_mission:
3240
3241
3242
3243 PFM_REG_RETFLAG_SET(req->reg_flags, PFM_REG_RETFL_EINVAL);
3244 return ret;
3245}
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256static int
3257pfm_read_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3258{
3259 struct task_struct *task;
3260 unsigned long val = 0UL, lval, ovfl_mask, sval;
3261 pfarg_reg_t *req = (pfarg_reg_t *)arg;
3262 unsigned int cnum, reg_flags = 0;
3263 int i, can_access_pmu = 0, state;
3264 int is_loaded, is_system, is_counting, expert_mode;
3265 int ret = -EINVAL;
3266 pfm_reg_check_t rd_func;
3267
3268
3269
3270
3271
3272
3273 state = ctx->ctx_state;
3274 is_loaded = state == PFM_CTX_LOADED ? 1 : 0;
3275 is_system = ctx->ctx_fl_system;
3276 ovfl_mask = pmu_conf->ovfl_val;
3277 task = ctx->ctx_task;
3278
3279 if (state == PFM_CTX_ZOMBIE) return -EINVAL;
3280
3281 if (likely(is_loaded)) {
3282
3283
3284
3285
3286
3287 if (unlikely(is_system && ctx->ctx_cpu != smp_processor_id())) {
3288 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
3289 return -EBUSY;
3290 }
3291
3292
3293
3294 can_access_pmu = GET_PMU_OWNER() == task || is_system ? 1 : 0;
3295
3296 if (can_access_pmu) ia64_srlz_d();
3297 }
3298 expert_mode = pfm_sysctl.expert_mode;
3299
3300 DPRINT(("ld=%d apmu=%d ctx_state=%d\n",
3301 is_loaded,
3302 can_access_pmu,
3303 state));
3304
3305
3306
3307
3308
3309
3310 for (i = 0; i < count; i++, req++) {
3311
3312 cnum = req->reg_num;
3313 reg_flags = req->reg_flags;
3314
3315 if (unlikely(!PMD_IS_IMPL(cnum))) goto error;
3316
3317
3318
3319
3320
3321
3322
3323
3324 if (unlikely(!CTX_IS_USED_PMD(ctx, cnum))) goto error;
3325
3326 sval = ctx->ctx_pmds[cnum].val;
3327 lval = ctx->ctx_pmds[cnum].lval;
3328 is_counting = PMD_IS_COUNTING(cnum);
3329
3330
3331
3332
3333
3334
3335 if (can_access_pmu){
3336 val = ia64_get_pmd(cnum);
3337 } else {
3338
3339
3340
3341
3342
3343 val = is_loaded ? ctx->th_pmds[cnum] : 0UL;
3344 }
3345 rd_func = pmu_conf->pmd_desc[cnum].read_check;
3346
3347 if (is_counting) {
3348
3349
3350
3351 val &= ovfl_mask;
3352 val += sval;
3353 }
3354
3355
3356
3357
3358 if (unlikely(expert_mode == 0 && rd_func)) {
3359 unsigned long v = val;
3360 ret = (*rd_func)(ctx->ctx_task, ctx, cnum, &v, regs);
3361 if (ret) goto error;
3362 val = v;
3363 ret = -EINVAL;
3364 }
3365
3366 PFM_REG_RETFLAG_SET(reg_flags, 0);
3367
3368 DPRINT(("pmd[%u]=0x%lx\n", cnum, val));
3369
3370
3371
3372
3373
3374
3375 req->reg_value = val;
3376 req->reg_flags = reg_flags;
3377 req->reg_last_reset_val = lval;
3378 }
3379
3380 return 0;
3381
3382error:
3383 PFM_REG_RETFLAG_SET(req->reg_flags, PFM_REG_RETFL_EINVAL);
3384 return ret;
3385}
3386
3387int
3388pfm_mod_write_pmcs(struct task_struct *task, void *req, unsigned int nreq, struct pt_regs *regs)
3389{
3390 pfm_context_t *ctx;
3391
3392 if (req == NULL) return -EINVAL;
3393
3394 ctx = GET_PMU_CTX();
3395
3396 if (ctx == NULL) return -EINVAL;
3397
3398
3399
3400
3401
3402 if (task != current && ctx->ctx_fl_system == 0) return -EBUSY;
3403
3404 return pfm_write_pmcs(ctx, req, nreq, regs);
3405}
3406EXPORT_SYMBOL(pfm_mod_write_pmcs);
3407
3408int
3409pfm_mod_read_pmds(struct task_struct *task, void *req, unsigned int nreq, struct pt_regs *regs)
3410{
3411 pfm_context_t *ctx;
3412
3413 if (req == NULL) return -EINVAL;
3414
3415 ctx = GET_PMU_CTX();
3416
3417 if (ctx == NULL) return -EINVAL;
3418
3419
3420
3421
3422
3423 if (task != current && ctx->ctx_fl_system == 0) return -EBUSY;
3424
3425 return pfm_read_pmds(ctx, req, nreq, regs);
3426}
3427EXPORT_SYMBOL(pfm_mod_read_pmds);
3428
3429
3430
3431
3432
3433int
3434pfm_use_debug_registers(struct task_struct *task)
3435{
3436 pfm_context_t *ctx = task->thread.pfm_context;
3437 unsigned long flags;
3438 int ret = 0;
3439
3440 if (pmu_conf->use_rr_dbregs == 0) return 0;
3441
3442 DPRINT(("called for [%d]\n", task_pid_nr(task)));
3443
3444
3445
3446
3447 if (task->thread.flags & IA64_THREAD_DBG_VALID) return 0;
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457 if (ctx && ctx->ctx_fl_using_dbreg == 1) return -1;
3458
3459 LOCK_PFS(flags);
3460
3461
3462
3463
3464
3465 if (pfm_sessions.pfs_sys_use_dbregs> 0)
3466 ret = -1;
3467 else
3468 pfm_sessions.pfs_ptrace_use_dbregs++;
3469
3470 DPRINT(("ptrace_use_dbregs=%u sys_use_dbregs=%u by [%d] ret = %d\n",
3471 pfm_sessions.pfs_ptrace_use_dbregs,
3472 pfm_sessions.pfs_sys_use_dbregs,
3473 task_pid_nr(task), ret));
3474
3475 UNLOCK_PFS(flags);
3476
3477 return ret;
3478}
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488int
3489pfm_release_debug_registers(struct task_struct *task)
3490{
3491 unsigned long flags;
3492 int ret;
3493
3494 if (pmu_conf->use_rr_dbregs == 0) return 0;
3495
3496 LOCK_PFS(flags);
3497 if (pfm_sessions.pfs_ptrace_use_dbregs == 0) {
3498 printk(KERN_ERR "perfmon: invalid release for [%d] ptrace_use_dbregs=0\n", task_pid_nr(task));
3499 ret = -1;
3500 } else {
3501 pfm_sessions.pfs_ptrace_use_dbregs--;
3502 ret = 0;
3503 }
3504 UNLOCK_PFS(flags);
3505
3506 return ret;
3507}
3508
3509static int
3510pfm_restart(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3511{
3512 struct task_struct *task;
3513 pfm_buffer_fmt_t *fmt;
3514 pfm_ovfl_ctrl_t rst_ctrl;
3515 int state, is_system;
3516 int ret = 0;
3517
3518 state = ctx->ctx_state;
3519 fmt = ctx->ctx_buf_fmt;
3520 is_system = ctx->ctx_fl_system;
3521 task = PFM_CTX_TASK(ctx);
3522
3523 switch(state) {
3524 case PFM_CTX_MASKED:
3525 break;
3526 case PFM_CTX_LOADED:
3527 if (CTX_HAS_SMPL(ctx) && fmt->fmt_restart_active) break;
3528
3529 case PFM_CTX_UNLOADED:
3530 case PFM_CTX_ZOMBIE:
3531 DPRINT(("invalid state=%d\n", state));
3532 return -EBUSY;
3533 default:
3534 DPRINT(("state=%d, cannot operate (no active_restart handler)\n", state));
3535 return -EINVAL;
3536 }
3537
3538
3539
3540
3541
3542
3543 if (is_system && ctx->ctx_cpu != smp_processor_id()) {
3544 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
3545 return -EBUSY;
3546 }
3547
3548
3549 if (unlikely(task == NULL)) {
3550 printk(KERN_ERR "perfmon: [%d] pfm_restart no task\n", task_pid_nr(current));
3551 return -EINVAL;
3552 }
3553
3554 if (task == current || is_system) {
3555
3556 fmt = ctx->ctx_buf_fmt;
3557
3558 DPRINT(("restarting self %d ovfl=0x%lx\n",
3559 task_pid_nr(task),
3560 ctx->ctx_ovfl_regs[0]));
3561
3562 if (CTX_HAS_SMPL(ctx)) {
3563
3564 prefetch(ctx->ctx_smpl_hdr);
3565
3566 rst_ctrl.bits.mask_monitoring = 0;
3567 rst_ctrl.bits.reset_ovfl_pmds = 0;
3568
3569 if (state == PFM_CTX_LOADED)
3570 ret = pfm_buf_fmt_restart_active(fmt, task, &rst_ctrl, ctx->ctx_smpl_hdr, regs);
3571 else
3572 ret = pfm_buf_fmt_restart(fmt, task, &rst_ctrl, ctx->ctx_smpl_hdr, regs);
3573 } else {
3574 rst_ctrl.bits.mask_monitoring = 0;
3575 rst_ctrl.bits.reset_ovfl_pmds = 1;
3576 }
3577
3578 if (ret == 0) {
3579 if (rst_ctrl.bits.reset_ovfl_pmds)
3580 pfm_reset_regs(ctx, ctx->ctx_ovfl_regs, PFM_PMD_LONG_RESET);
3581
3582 if (rst_ctrl.bits.mask_monitoring == 0) {
3583 DPRINT(("resuming monitoring for [%d]\n", task_pid_nr(task)));
3584
3585 if (state == PFM_CTX_MASKED) pfm_restore_monitoring(task);
3586 } else {
3587 DPRINT(("keeping monitoring stopped for [%d]\n", task_pid_nr(task)));
3588
3589
3590 }
3591 }
3592
3593
3594
3595 ctx->ctx_ovfl_regs[0] = 0UL;
3596
3597
3598
3599
3600 ctx->ctx_state = PFM_CTX_LOADED;
3601
3602
3603
3604
3605 ctx->ctx_fl_can_restart = 0;
3606
3607 return 0;
3608 }
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618 if (state == PFM_CTX_MASKED) {
3619 if (ctx->ctx_fl_can_restart == 0) return -EINVAL;
3620
3621
3622
3623
3624 ctx->ctx_fl_can_restart = 0;
3625 }
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643 if (CTX_OVFL_NOBLOCK(ctx) == 0 && state == PFM_CTX_MASKED) {
3644 DPRINT(("unblocking [%d]\n", task_pid_nr(task)));
3645 complete(&ctx->ctx_restart_done);
3646 } else {
3647 DPRINT(("[%d] armed exit trap\n", task_pid_nr(task)));
3648
3649 ctx->ctx_fl_trap_reason = PFM_TRAP_REASON_RESET;
3650
3651 PFM_SET_WORK_PENDING(task, 1);
3652
3653 set_notify_resume(task);
3654
3655
3656
3657
3658 }
3659 return 0;
3660}
3661
3662static int
3663pfm_debug(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3664{
3665 unsigned int m = *(unsigned int *)arg;
3666
3667 pfm_sysctl.debug = m == 0 ? 0 : 1;
3668
3669 printk(KERN_INFO "perfmon debugging %s (timing reset)\n", pfm_sysctl.debug ? "on" : "off");
3670
3671 if (m == 0) {
3672 memset(pfm_stats, 0, sizeof(pfm_stats));
3673 for(m=0; m < NR_CPUS; m++) pfm_stats[m].pfm_ovfl_intr_cycles_min = ~0UL;
3674 }
3675 return 0;
3676}
3677
3678
3679
3680
3681static int
3682pfm_write_ibr_dbr(int mode, pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3683{
3684 struct thread_struct *thread = NULL;
3685 struct task_struct *task;
3686 pfarg_dbreg_t *req = (pfarg_dbreg_t *)arg;
3687 unsigned long flags;
3688 dbreg_t dbreg;
3689 unsigned int rnum;
3690 int first_time;
3691 int ret = 0, state;
3692 int i, can_access_pmu = 0;
3693 int is_system, is_loaded;
3694
3695 if (pmu_conf->use_rr_dbregs == 0) return -EINVAL;
3696
3697 state = ctx->ctx_state;
3698 is_loaded = state == PFM_CTX_LOADED ? 1 : 0;
3699 is_system = ctx->ctx_fl_system;
3700 task = ctx->ctx_task;
3701
3702 if (state == PFM_CTX_ZOMBIE) return -EINVAL;
3703
3704
3705
3706
3707
3708 if (is_loaded) {
3709 thread = &task->thread;
3710
3711
3712
3713
3714
3715 if (unlikely(is_system && ctx->ctx_cpu != smp_processor_id())) {
3716 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
3717 return -EBUSY;
3718 }
3719 can_access_pmu = GET_PMU_OWNER() == task || is_system ? 1 : 0;
3720 }
3721
3722
3723
3724
3725
3726
3727
3728
3729 first_time = ctx->ctx_fl_using_dbreg == 0;
3730
3731
3732
3733
3734 if (is_loaded && (thread->flags & IA64_THREAD_DBG_VALID) != 0) {
3735 DPRINT(("debug registers already in use for [%d]\n", task_pid_nr(task)));
3736 return -EBUSY;
3737 }
3738
3739
3740
3741
3742
3743
3744
3745
3746 if (is_loaded) {
3747 LOCK_PFS(flags);
3748
3749 if (first_time && is_system) {
3750 if (pfm_sessions.pfs_ptrace_use_dbregs)
3751 ret = -EBUSY;
3752 else
3753 pfm_sessions.pfs_sys_use_dbregs++;
3754 }
3755 UNLOCK_PFS(flags);
3756 }
3757
3758 if (ret != 0) return ret;
3759
3760
3761
3762
3763
3764 ctx->ctx_fl_using_dbreg = 1;
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775 if (first_time && can_access_pmu) {
3776 DPRINT(("[%d] clearing ibrs, dbrs\n", task_pid_nr(task)));
3777 for (i=0; i < pmu_conf->num_ibrs; i++) {
3778 ia64_set_ibr(i, 0UL);
3779 ia64_dv_serialize_instruction();
3780 }
3781 ia64_srlz_i();
3782 for (i=0; i < pmu_conf->num_dbrs; i++) {
3783 ia64_set_dbr(i, 0UL);
3784 ia64_dv_serialize_data();
3785 }
3786 ia64_srlz_d();
3787 }
3788
3789
3790
3791
3792 for (i = 0; i < count; i++, req++) {
3793
3794 rnum = req->dbreg_num;
3795 dbreg.val = req->dbreg_value;
3796
3797 ret = -EINVAL;
3798
3799 if ((mode == PFM_CODE_RR && rnum >= PFM_NUM_IBRS) || ((mode == PFM_DATA_RR) && rnum >= PFM_NUM_DBRS)) {
3800 DPRINT(("invalid register %u val=0x%lx mode=%d i=%d count=%d\n",
3801 rnum, dbreg.val, mode, i, count));
3802
3803 goto abort_mission;
3804 }
3805
3806
3807
3808
3809 if (rnum & 0x1) {
3810 if (mode == PFM_CODE_RR)
3811 dbreg.ibr.ibr_x = 0;
3812 else
3813 dbreg.dbr.dbr_r = dbreg.dbr.dbr_w = 0;
3814 }
3815
3816 PFM_REG_RETFLAG_SET(req->dbreg_flags, 0);
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828 if (mode == PFM_CODE_RR) {
3829 CTX_USED_IBR(ctx, rnum);
3830
3831 if (can_access_pmu) {
3832 ia64_set_ibr(rnum, dbreg.val);
3833 ia64_dv_serialize_instruction();
3834 }
3835
3836 ctx->ctx_ibrs[rnum] = dbreg.val;
3837
3838 DPRINT(("write ibr%u=0x%lx used_ibrs=0x%x ld=%d apmu=%d\n",
3839 rnum, dbreg.val, ctx->ctx_used_ibrs[0], is_loaded, can_access_pmu));
3840 } else {
3841 CTX_USED_DBR(ctx, rnum);
3842
3843 if (can_access_pmu) {
3844 ia64_set_dbr(rnum, dbreg.val);
3845 ia64_dv_serialize_data();
3846 }
3847 ctx->ctx_dbrs[rnum] = dbreg.val;
3848
3849 DPRINT(("write dbr%u=0x%lx used_dbrs=0x%x ld=%d apmu=%d\n",
3850 rnum, dbreg.val, ctx->ctx_used_dbrs[0], is_loaded, can_access_pmu));
3851 }
3852 }
3853
3854 return 0;
3855
3856abort_mission:
3857
3858
3859
3860 if (first_time) {
3861 LOCK_PFS(flags);
3862 if (ctx->ctx_fl_system) {
3863 pfm_sessions.pfs_sys_use_dbregs--;
3864 }
3865 UNLOCK_PFS(flags);
3866 ctx->ctx_fl_using_dbreg = 0;
3867 }
3868
3869
3870
3871 PFM_REG_RETFLAG_SET(req->dbreg_flags, PFM_REG_RETFL_EINVAL);
3872
3873 return ret;
3874}
3875
3876static int
3877pfm_write_ibrs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3878{
3879 return pfm_write_ibr_dbr(PFM_CODE_RR, ctx, arg, count, regs);
3880}
3881
3882static int
3883pfm_write_dbrs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3884{
3885 return pfm_write_ibr_dbr(PFM_DATA_RR, ctx, arg, count, regs);
3886}
3887
3888int
3889pfm_mod_write_ibrs(struct task_struct *task, void *req, unsigned int nreq, struct pt_regs *regs)
3890{
3891 pfm_context_t *ctx;
3892
3893 if (req == NULL) return -EINVAL;
3894
3895 ctx = GET_PMU_CTX();
3896
3897 if (ctx == NULL) return -EINVAL;
3898
3899
3900
3901
3902
3903 if (task != current && ctx->ctx_fl_system == 0) return -EBUSY;
3904
3905 return pfm_write_ibrs(ctx, req, nreq, regs);
3906}
3907EXPORT_SYMBOL(pfm_mod_write_ibrs);
3908
3909int
3910pfm_mod_write_dbrs(struct task_struct *task, void *req, unsigned int nreq, struct pt_regs *regs)
3911{
3912 pfm_context_t *ctx;
3913
3914 if (req == NULL) return -EINVAL;
3915
3916 ctx = GET_PMU_CTX();
3917
3918 if (ctx == NULL) return -EINVAL;
3919
3920
3921
3922
3923
3924 if (task != current && ctx->ctx_fl_system == 0) return -EBUSY;
3925
3926 return pfm_write_dbrs(ctx, req, nreq, regs);
3927}
3928EXPORT_SYMBOL(pfm_mod_write_dbrs);
3929
3930
3931static int
3932pfm_get_features(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3933{
3934 pfarg_features_t *req = (pfarg_features_t *)arg;
3935
3936 req->ft_version = PFM_VERSION;
3937 return 0;
3938}
3939
3940static int
3941pfm_stop(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3942{
3943 struct pt_regs *tregs;
3944 struct task_struct *task = PFM_CTX_TASK(ctx);
3945 int state, is_system;
3946
3947 state = ctx->ctx_state;
3948 is_system = ctx->ctx_fl_system;
3949
3950
3951
3952
3953 if (state == PFM_CTX_UNLOADED) return -EINVAL;
3954
3955
3956
3957
3958
3959
3960 if (is_system && ctx->ctx_cpu != smp_processor_id()) {
3961 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
3962 return -EBUSY;
3963 }
3964 DPRINT(("task [%d] ctx_state=%d is_system=%d\n",
3965 task_pid_nr(PFM_CTX_TASK(ctx)),
3966 state,
3967 is_system));
3968
3969
3970
3971
3972
3973 if (is_system) {
3974
3975
3976
3977
3978
3979 ia64_setreg(_IA64_REG_CR_DCR, ia64_getreg(_IA64_REG_CR_DCR) & ~IA64_DCR_PP);
3980 ia64_srlz_i();
3981
3982
3983
3984
3985 PFM_CPUINFO_CLEAR(PFM_CPUINFO_DCR_PP);
3986
3987
3988
3989
3990 pfm_clear_psr_pp();
3991
3992
3993
3994
3995 ia64_psr(regs)->pp = 0;
3996
3997 return 0;
3998 }
3999
4000
4001
4002
4003 if (task == current) {
4004
4005 pfm_clear_psr_up();
4006
4007
4008
4009
4010 ia64_psr(regs)->up = 0;
4011 } else {
4012 tregs = task_pt_regs(task);
4013
4014
4015
4016
4017 ia64_psr(tregs)->up = 0;
4018
4019
4020
4021
4022 ctx->ctx_saved_psr_up = 0;
4023 DPRINT(("task=[%d]\n", task_pid_nr(task)));
4024 }
4025 return 0;
4026}
4027
4028
4029static int
4030pfm_start(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
4031{
4032 struct pt_regs *tregs;
4033 int state, is_system;
4034
4035 state = ctx->ctx_state;
4036 is_system = ctx->ctx_fl_system;
4037
4038 if (state != PFM_CTX_LOADED) return -EINVAL;
4039
4040
4041
4042
4043
4044
4045 if (is_system && ctx->ctx_cpu != smp_processor_id()) {
4046 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
4047 return -EBUSY;
4048 }
4049
4050
4051
4052
4053
4054
4055 if (is_system) {
4056
4057
4058
4059
4060 ia64_psr(regs)->pp = 1;
4061
4062
4063
4064
4065 PFM_CPUINFO_SET(PFM_CPUINFO_DCR_PP);
4066
4067
4068
4069
4070 pfm_set_psr_pp();
4071
4072
4073 ia64_setreg(_IA64_REG_CR_DCR, ia64_getreg(_IA64_REG_CR_DCR) | IA64_DCR_PP);
4074 ia64_srlz_i();
4075
4076 return 0;
4077 }
4078
4079
4080
4081
4082
4083 if (ctx->ctx_task == current) {
4084
4085
4086 pfm_set_psr_up();
4087
4088
4089
4090
4091 ia64_psr(regs)->up = 1;
4092
4093 } else {
4094 tregs = task_pt_regs(ctx->ctx_task);
4095
4096
4097
4098
4099
4100 ctx->ctx_saved_psr_up = IA64_PSR_UP;
4101
4102
4103
4104
4105 ia64_psr(tregs)->up = 1;
4106 }
4107 return 0;
4108}
4109
4110static int
4111pfm_get_pmc_reset(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
4112{
4113 pfarg_reg_t *req = (pfarg_reg_t *)arg;
4114 unsigned int cnum;
4115 int i;
4116 int ret = -EINVAL;
4117
4118 for (i = 0; i < count; i++, req++) {
4119
4120 cnum = req->reg_num;
4121
4122 if (!PMC_IS_IMPL(cnum)) goto abort_mission;
4123
4124 req->reg_value = PMC_DFL_VAL(cnum);
4125
4126 PFM_REG_RETFLAG_SET(req->reg_flags, 0);
4127
4128 DPRINT(("pmc_reset_val pmc[%u]=0x%lx\n", cnum, req->reg_value));
4129 }
4130 return 0;
4131
4132abort_mission:
4133 PFM_REG_RETFLAG_SET(req->reg_flags, PFM_REG_RETFL_EINVAL);
4134 return ret;
4135}
4136
4137static int
4138pfm_check_task_exist(pfm_context_t *ctx)
4139{
4140 struct task_struct *g, *t;
4141 int ret = -ESRCH;
4142
4143 read_lock(&tasklist_lock);
4144
4145 do_each_thread (g, t) {
4146 if (t->thread.pfm_context == ctx) {
4147 ret = 0;
4148 goto out;
4149 }
4150 } while_each_thread (g, t);
4151out:
4152 read_unlock(&tasklist_lock);
4153
4154 DPRINT(("pfm_check_task_exist: ret=%d ctx=%p\n", ret, ctx));
4155
4156 return ret;
4157}
4158
4159static int
4160pfm_context_load(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
4161{
4162 struct task_struct *task;
4163 struct thread_struct *thread;
4164 struct pfm_context_t *old;
4165 unsigned long flags;
4166#ifndef CONFIG_SMP
4167 struct task_struct *owner_task = NULL;
4168#endif
4169 pfarg_load_t *req = (pfarg_load_t *)arg;
4170 unsigned long *pmcs_source, *pmds_source;
4171 int the_cpu;
4172 int ret = 0;
4173 int state, is_system, set_dbregs = 0;
4174
4175 state = ctx->ctx_state;
4176 is_system = ctx->ctx_fl_system;
4177
4178
4179
4180 if (state != PFM_CTX_UNLOADED) {
4181 DPRINT(("cannot load to [%d], invalid ctx_state=%d\n",
4182 req->load_pid,
4183 ctx->ctx_state));
4184 return -EBUSY;
4185 }
4186
4187 DPRINT(("load_pid [%d] using_dbreg=%d\n", req->load_pid, ctx->ctx_fl_using_dbreg));
4188
4189 if (CTX_OVFL_NOBLOCK(ctx) == 0 && req->load_pid == current->pid) {
4190 DPRINT(("cannot use blocking mode on self\n"));
4191 return -EINVAL;
4192 }
4193
4194 ret = pfm_get_task(ctx, req->load_pid, &task);
4195 if (ret) {
4196 DPRINT(("load_pid [%d] get_task=%d\n", req->load_pid, ret));
4197 return ret;
4198 }
4199
4200 ret = -EINVAL;
4201
4202
4203
4204
4205 if (is_system && task != current) {
4206 DPRINT(("system wide is self monitoring only load_pid=%d\n",
4207 req->load_pid));
4208 goto error;
4209 }
4210
4211 thread = &task->thread;
4212
4213 ret = 0;
4214
4215
4216
4217
4218 if (ctx->ctx_fl_using_dbreg) {
4219 if (thread->flags & IA64_THREAD_DBG_VALID) {
4220 ret = -EBUSY;
4221 DPRINT(("load_pid [%d] task is debugged, cannot load range restrictions\n", req->load_pid));
4222 goto error;
4223 }
4224 LOCK_PFS(flags);
4225
4226 if (is_system) {
4227 if (pfm_sessions.pfs_ptrace_use_dbregs) {
4228 DPRINT(("cannot load [%d] dbregs in use\n",
4229 task_pid_nr(task)));
4230 ret = -EBUSY;
4231 } else {
4232 pfm_sessions.pfs_sys_use_dbregs++;
4233 DPRINT(("load [%d] increased sys_use_dbreg=%u\n", task_pid_nr(task), pfm_sessions.pfs_sys_use_dbregs));
4234 set_dbregs = 1;
4235 }
4236 }
4237
4238 UNLOCK_PFS(flags);
4239
4240 if (ret) goto error;
4241 }
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258 the_cpu = ctx->ctx_cpu = smp_processor_id();
4259
4260 ret = -EBUSY;
4261
4262
4263
4264 ret = pfm_reserve_session(current, is_system, the_cpu);
4265 if (ret) goto error;
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276 DPRINT(("before cmpxchg() old_ctx=%p new_ctx=%p\n",
4277 thread->pfm_context, ctx));
4278
4279 ret = -EBUSY;
4280 old = ia64_cmpxchg(acq, &thread->pfm_context, NULL, ctx, sizeof(pfm_context_t *));
4281 if (old != NULL) {
4282 DPRINT(("load_pid [%d] already has a context\n", req->load_pid));
4283 goto error_unres;
4284 }
4285
4286 pfm_reset_msgq(ctx);
4287
4288 ctx->ctx_state = PFM_CTX_LOADED;
4289
4290
4291
4292
4293 ctx->ctx_task = task;
4294
4295 if (is_system) {
4296
4297
4298
4299 PFM_CPUINFO_SET(PFM_CPUINFO_SYST_WIDE);
4300 PFM_CPUINFO_CLEAR(PFM_CPUINFO_DCR_PP);
4301
4302 if (ctx->ctx_fl_excl_idle) PFM_CPUINFO_SET(PFM_CPUINFO_EXCL_IDLE);
4303 } else {
4304 thread->flags |= IA64_THREAD_PM_VALID;
4305 }
4306
4307
4308
4309
4310 pfm_copy_pmds(task, ctx);
4311 pfm_copy_pmcs(task, ctx);
4312
4313 pmcs_source = ctx->th_pmcs;
4314 pmds_source = ctx->th_pmds;
4315
4316
4317
4318
4319 if (task == current) {
4320
4321 if (is_system == 0) {
4322
4323
4324 ia64_psr(regs)->sp = 0;
4325 DPRINT(("clearing psr.sp for [%d]\n", task_pid_nr(task)));
4326
4327 SET_LAST_CPU(ctx, smp_processor_id());
4328 INC_ACTIVATION();
4329 SET_ACTIVATION(ctx);
4330#ifndef CONFIG_SMP
4331
4332
4333
4334 owner_task = GET_PMU_OWNER();
4335 if (owner_task) pfm_lazy_save_regs(owner_task);
4336#endif
4337 }
4338
4339
4340
4341
4342 pfm_restore_pmds(pmds_source, ctx->ctx_all_pmds[0]);
4343 pfm_restore_pmcs(pmcs_source, ctx->ctx_all_pmcs[0]);
4344
4345 ctx->ctx_reload_pmcs[0] = 0UL;
4346 ctx->ctx_reload_pmds[0] = 0UL;
4347
4348
4349
4350
4351 if (ctx->ctx_fl_using_dbreg) {
4352 pfm_restore_ibrs(ctx->ctx_ibrs, pmu_conf->num_ibrs);
4353 pfm_restore_dbrs(ctx->ctx_dbrs, pmu_conf->num_dbrs);
4354 }
4355
4356
4357
4358 SET_PMU_OWNER(task, ctx);
4359
4360 DPRINT(("context loaded on PMU for [%d]\n", task_pid_nr(task)));
4361 } else {
4362
4363
4364
4365 regs = task_pt_regs(task);
4366
4367
4368 ctx->ctx_last_activation = PFM_INVALID_ACTIVATION;
4369 SET_LAST_CPU(ctx, -1);
4370
4371
4372 ctx->ctx_saved_psr_up = 0UL;
4373 ia64_psr(regs)->up = ia64_psr(regs)->pp = 0;
4374 }
4375
4376 ret = 0;
4377
4378error_unres:
4379 if (ret) pfm_unreserve_session(ctx, ctx->ctx_fl_system, the_cpu);
4380error:
4381
4382
4383
4384 if (ret && set_dbregs) {
4385 LOCK_PFS(flags);
4386 pfm_sessions.pfs_sys_use_dbregs--;
4387 UNLOCK_PFS(flags);
4388 }
4389
4390
4391
4392 if (is_system == 0 && task != current) {
4393 pfm_put_task(task);
4394
4395 if (ret == 0) {
4396 ret = pfm_check_task_exist(ctx);
4397 if (ret) {
4398 ctx->ctx_state = PFM_CTX_UNLOADED;
4399 ctx->ctx_task = NULL;
4400 }
4401 }
4402 }
4403 return ret;
4404}
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414static void pfm_flush_pmds(struct task_struct *, pfm_context_t *ctx);
4415
4416static int
4417pfm_context_unload(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
4418{
4419 struct task_struct *task = PFM_CTX_TASK(ctx);
4420 struct pt_regs *tregs;
4421 int prev_state, is_system;
4422 int ret;
4423
4424 DPRINT(("ctx_state=%d task [%d]\n", ctx->ctx_state, task ? task_pid_nr(task) : -1));
4425
4426 prev_state = ctx->ctx_state;
4427 is_system = ctx->ctx_fl_system;
4428
4429
4430
4431
4432 if (prev_state == PFM_CTX_UNLOADED) {
4433 DPRINT(("ctx_state=%d, nothing to do\n", prev_state));
4434 return 0;
4435 }
4436
4437
4438
4439
4440 ret = pfm_stop(ctx, NULL, 0, regs);
4441 if (ret) return ret;
4442
4443 ctx->ctx_state = PFM_CTX_UNLOADED;
4444
4445
4446
4447
4448
4449
4450 if (is_system) {
4451
4452
4453
4454
4455
4456
4457 PFM_CPUINFO_CLEAR(PFM_CPUINFO_SYST_WIDE);
4458 PFM_CPUINFO_CLEAR(PFM_CPUINFO_EXCL_IDLE);
4459
4460
4461
4462
4463
4464 pfm_flush_pmds(current, ctx);
4465
4466
4467
4468
4469
4470 if (prev_state != PFM_CTX_ZOMBIE)
4471 pfm_unreserve_session(ctx, 1 , ctx->ctx_cpu);
4472
4473
4474
4475
4476 task->thread.pfm_context = NULL;
4477
4478
4479
4480 ctx->ctx_task = NULL;
4481
4482
4483
4484
4485 return 0;
4486 }
4487
4488
4489
4490
4491 tregs = task == current ? regs : task_pt_regs(task);
4492
4493 if (task == current) {
4494
4495
4496
4497 ia64_psr(regs)->sp = 1;
4498
4499 DPRINT(("setting psr.sp for [%d]\n", task_pid_nr(task)));
4500 }
4501
4502
4503
4504
4505 pfm_flush_pmds(task, ctx);
4506
4507
4508
4509
4510
4511
4512
4513 if (prev_state != PFM_CTX_ZOMBIE)
4514 pfm_unreserve_session(ctx, 0 , ctx->ctx_cpu);
4515
4516
4517
4518
4519 ctx->ctx_last_activation = PFM_INVALID_ACTIVATION;
4520 SET_LAST_CPU(ctx, -1);
4521
4522
4523
4524
4525 task->thread.flags &= ~IA64_THREAD_PM_VALID;
4526
4527
4528
4529
4530 task->thread.pfm_context = NULL;
4531 ctx->ctx_task = NULL;
4532
4533 PFM_SET_WORK_PENDING(task, 0);
4534
4535 ctx->ctx_fl_trap_reason = PFM_TRAP_REASON_NONE;
4536 ctx->ctx_fl_can_restart = 0;
4537 ctx->ctx_fl_going_zombie = 0;
4538
4539 DPRINT(("disconnected [%d] from context\n", task_pid_nr(task)));
4540
4541 return 0;
4542}
4543
4544
4545
4546
4547
4548
4549void
4550pfm_exit_thread(struct task_struct *task)
4551{
4552 pfm_context_t *ctx;
4553 unsigned long flags;
4554 struct pt_regs *regs = task_pt_regs(task);
4555 int ret, state;
4556 int free_ok = 0;
4557
4558 ctx = PFM_GET_CTX(task);
4559
4560 PROTECT_CTX(ctx, flags);
4561
4562 DPRINT(("state=%d task [%d]\n", ctx->ctx_state, task_pid_nr(task)));
4563
4564 state = ctx->ctx_state;
4565 switch(state) {
4566 case PFM_CTX_UNLOADED:
4567
4568
4569
4570
4571 printk(KERN_ERR "perfmon: pfm_exit_thread [%d] ctx unloaded\n", task_pid_nr(task));
4572 break;
4573 case PFM_CTX_LOADED:
4574 case PFM_CTX_MASKED:
4575 ret = pfm_context_unload(ctx, NULL, 0, regs);
4576 if (ret) {
4577 printk(KERN_ERR "perfmon: pfm_exit_thread [%d] state=%d unload failed %d\n", task_pid_nr(task), state, ret);
4578 }
4579 DPRINT(("ctx unloaded for current state was %d\n", state));
4580
4581 pfm_end_notify_user(ctx);
4582 break;
4583 case PFM_CTX_ZOMBIE:
4584 ret = pfm_context_unload(ctx, NULL, 0, regs);
4585 if (ret) {
4586 printk(KERN_ERR "perfmon: pfm_exit_thread [%d] state=%d unload failed %d\n", task_pid_nr(task), state, ret);
4587 }
4588 free_ok = 1;
4589 break;
4590 default:
4591 printk(KERN_ERR "perfmon: pfm_exit_thread [%d] unexpected state=%d\n", task_pid_nr(task), state);
4592 break;
4593 }
4594 UNPROTECT_CTX(ctx, flags);
4595
4596 { u64 psr = pfm_get_psr();
4597 BUG_ON(psr & (IA64_PSR_UP|IA64_PSR_PP));
4598 BUG_ON(GET_PMU_OWNER());
4599 BUG_ON(ia64_psr(regs)->up);
4600 BUG_ON(ia64_psr(regs)->pp);
4601 }
4602
4603
4604
4605
4606
4607 if (free_ok) pfm_context_free(ctx);
4608}
4609
4610
4611
4612
4613#define PFM_CMD(name, flags, arg_count, arg_type, getsz) { name, #name, flags, arg_count, sizeof(arg_type), getsz }
4614#define PFM_CMD_S(name, flags) { name, #name, flags, 0, 0, NULL }
4615#define PFM_CMD_PCLRWS (PFM_CMD_FD|PFM_CMD_ARG_RW|PFM_CMD_STOP)
4616#define PFM_CMD_PCLRW (PFM_CMD_FD|PFM_CMD_ARG_RW)
4617#define PFM_CMD_NONE { NULL, "no-cmd", 0, 0, 0, NULL}
4618
4619static pfm_cmd_desc_t pfm_cmd_tab[]={
4620PFM_CMD_NONE,
4621PFM_CMD(pfm_write_pmcs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_reg_t, NULL),
4622PFM_CMD(pfm_write_pmds, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_reg_t, NULL),
4623PFM_CMD(pfm_read_pmds, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_reg_t, NULL),
4624PFM_CMD_S(pfm_stop, PFM_CMD_PCLRWS),
4625PFM_CMD_S(pfm_start, PFM_CMD_PCLRWS),
4626PFM_CMD_NONE,
4627PFM_CMD_NONE,
4628PFM_CMD(pfm_context_create, PFM_CMD_ARG_RW, 1, pfarg_context_t, pfm_ctx_getsize),
4629PFM_CMD_NONE,
4630PFM_CMD_S(pfm_restart, PFM_CMD_PCLRW),
4631PFM_CMD_NONE,
4632PFM_CMD(pfm_get_features, PFM_CMD_ARG_RW, 1, pfarg_features_t, NULL),
4633PFM_CMD(pfm_debug, 0, 1, unsigned int, NULL),
4634PFM_CMD_NONE,
4635PFM_CMD(pfm_get_pmc_reset, PFM_CMD_ARG_RW, PFM_CMD_ARG_MANY, pfarg_reg_t, NULL),
4636PFM_CMD(pfm_context_load, PFM_CMD_PCLRWS, 1, pfarg_load_t, NULL),
4637PFM_CMD_S(pfm_context_unload, PFM_CMD_PCLRWS),
4638PFM_CMD_NONE,
4639PFM_CMD_NONE,
4640PFM_CMD_NONE,
4641PFM_CMD_NONE,
4642PFM_CMD_NONE,
4643PFM_CMD_NONE,
4644PFM_CMD_NONE,
4645PFM_CMD_NONE,
4646PFM_CMD_NONE,
4647PFM_CMD_NONE,
4648PFM_CMD_NONE,
4649PFM_CMD_NONE,
4650PFM_CMD_NONE,
4651PFM_CMD_NONE,
4652PFM_CMD(pfm_write_ibrs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_dbreg_t, NULL),
4653PFM_CMD(pfm_write_dbrs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_dbreg_t, NULL)
4654};
4655#define PFM_CMD_COUNT (sizeof(pfm_cmd_tab)/sizeof(pfm_cmd_desc_t))
4656
4657static int
4658pfm_check_task_state(pfm_context_t *ctx, int cmd, unsigned long flags)
4659{
4660 struct task_struct *task;
4661 int state, old_state;
4662
4663recheck:
4664 state = ctx->ctx_state;
4665 task = ctx->ctx_task;
4666
4667 if (task == NULL) {
4668 DPRINT(("context %d no task, state=%d\n", ctx->ctx_fd, state));
4669 return 0;
4670 }
4671
4672 DPRINT(("context %d state=%d [%d] task_state=%ld must_stop=%d\n",
4673 ctx->ctx_fd,
4674 state,
4675 task_pid_nr(task),
4676 task->state, PFM_CMD_STOPPED(cmd)));
4677
4678
4679
4680
4681
4682
4683
4684
4685 if (task == current || ctx->ctx_fl_system) return 0;
4686
4687
4688
4689
4690 switch(state) {
4691 case PFM_CTX_UNLOADED:
4692
4693
4694
4695 return 0;
4696 case PFM_CTX_ZOMBIE:
4697
4698
4699
4700 DPRINT(("cmd %d state zombie cannot operate on context\n", cmd));
4701 return -EINVAL;
4702 case PFM_CTX_MASKED:
4703
4704
4705
4706
4707 if (cmd != PFM_UNLOAD_CONTEXT) return 0;
4708 }
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720 if (PFM_CMD_STOPPED(cmd)) {
4721 if (!task_is_stopped_or_traced(task)) {
4722 DPRINT(("[%d] task not in stopped state\n", task_pid_nr(task)));
4723 return -EBUSY;
4724 }
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739 old_state = state;
4740
4741 UNPROTECT_CTX(ctx, flags);
4742
4743 wait_task_inactive(task, 0);
4744
4745 PROTECT_CTX(ctx, flags);
4746
4747
4748
4749
4750 if (ctx->ctx_state != old_state) {
4751 DPRINT(("old_state=%d new_state=%d\n", old_state, ctx->ctx_state));
4752 goto recheck;
4753 }
4754 }
4755 return 0;
4756}
4757
4758
4759
4760
4761asmlinkage long
4762sys_perfmonctl (int fd, int cmd, void __user *arg, int count)
4763{
4764 struct fd f = {NULL, 0};
4765 pfm_context_t *ctx = NULL;
4766 unsigned long flags = 0UL;
4767 void *args_k = NULL;
4768 long ret;
4769 size_t base_sz, sz, xtra_sz = 0;
4770 int narg, completed_args = 0, call_made = 0, cmd_flags;
4771 int (*func)(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs);
4772 int (*getsize)(void *arg, size_t *sz);
4773#define PFM_MAX_ARGSIZE 4096
4774
4775
4776
4777
4778 if (unlikely(pmu_conf == NULL)) return -ENOSYS;
4779
4780 if (unlikely(cmd < 0 || cmd >= PFM_CMD_COUNT)) {
4781 DPRINT(("invalid cmd=%d\n", cmd));
4782 return -EINVAL;
4783 }
4784
4785 func = pfm_cmd_tab[cmd].cmd_func;
4786 narg = pfm_cmd_tab[cmd].cmd_narg;
4787 base_sz = pfm_cmd_tab[cmd].cmd_argsize;
4788 getsize = pfm_cmd_tab[cmd].cmd_getsize;
4789 cmd_flags = pfm_cmd_tab[cmd].cmd_flags;
4790
4791 if (unlikely(func == NULL)) {
4792 DPRINT(("invalid cmd=%d\n", cmd));
4793 return -EINVAL;
4794 }
4795
4796 DPRINT(("cmd=%s idx=%d narg=0x%x argsz=%lu count=%d\n",
4797 PFM_CMD_NAME(cmd),
4798 cmd,
4799 narg,
4800 base_sz,
4801 count));
4802
4803
4804
4805
4806 if (unlikely((narg == PFM_CMD_ARG_MANY && count <= 0) || (narg > 0 && narg != count)))
4807 return -EINVAL;
4808
4809restart_args:
4810 sz = xtra_sz + base_sz*count;
4811
4812
4813
4814 if (unlikely(sz > PFM_MAX_ARGSIZE)) {
4815 printk(KERN_ERR "perfmon: [%d] argument too big %lu\n", task_pid_nr(current), sz);
4816 return -E2BIG;
4817 }
4818
4819
4820
4821
4822 if (likely(count && args_k == NULL)) {
4823 args_k = kmalloc(PFM_MAX_ARGSIZE, GFP_KERNEL);
4824 if (args_k == NULL) return -ENOMEM;
4825 }
4826
4827 ret = -EFAULT;
4828
4829
4830
4831
4832
4833
4834 if (sz && copy_from_user(args_k, arg, sz)) {
4835 DPRINT(("cannot copy_from_user %lu bytes @%p\n", sz, arg));
4836 goto error_args;
4837 }
4838
4839
4840
4841
4842 if (completed_args == 0 && getsize) {
4843
4844
4845
4846 ret = (*getsize)(args_k, &xtra_sz);
4847 if (ret) goto error_args;
4848
4849 completed_args = 1;
4850
4851 DPRINT(("restart_args sz=%lu xtra_sz=%lu\n", sz, xtra_sz));
4852
4853
4854 if (likely(xtra_sz)) goto restart_args;
4855 }
4856
4857 if (unlikely((cmd_flags & PFM_CMD_FD) == 0)) goto skip_fd;
4858
4859 ret = -EBADF;
4860
4861 f = fdget(fd);
4862 if (unlikely(f.file == NULL)) {
4863 DPRINT(("invalid fd %d\n", fd));
4864 goto error_args;
4865 }
4866 if (unlikely(PFM_IS_FILE(f.file) == 0)) {
4867 DPRINT(("fd %d not related to perfmon\n", fd));
4868 goto error_args;
4869 }
4870
4871 ctx = f.file->private_data;
4872 if (unlikely(ctx == NULL)) {
4873 DPRINT(("no context for fd %d\n", fd));
4874 goto error_args;
4875 }
4876 prefetch(&ctx->ctx_state);
4877
4878 PROTECT_CTX(ctx, flags);
4879
4880
4881
4882
4883 ret = pfm_check_task_state(ctx, cmd, flags);
4884 if (unlikely(ret)) goto abort_locked;
4885
4886skip_fd:
4887 ret = (*func)(ctx, args_k, count, task_pt_regs(current));
4888
4889 call_made = 1;
4890
4891abort_locked:
4892 if (likely(ctx)) {
4893 DPRINT(("context unlocked\n"));
4894 UNPROTECT_CTX(ctx, flags);
4895 }
4896
4897
4898 if (call_made && PFM_CMD_RW_ARG(cmd) && copy_to_user(arg, args_k, base_sz*count)) ret = -EFAULT;
4899
4900error_args:
4901 if (f.file)
4902 fdput(f);
4903
4904 kfree(args_k);
4905
4906 DPRINT(("cmd=%s ret=%ld\n", PFM_CMD_NAME(cmd), ret));
4907
4908 return ret;
4909}
4910
4911static void
4912pfm_resume_after_ovfl(pfm_context_t *ctx, unsigned long ovfl_regs, struct pt_regs *regs)
4913{
4914 pfm_buffer_fmt_t *fmt = ctx->ctx_buf_fmt;
4915 pfm_ovfl_ctrl_t rst_ctrl;
4916 int state;
4917 int ret = 0;
4918
4919 state = ctx->ctx_state;
4920
4921
4922
4923
4924 if (CTX_HAS_SMPL(ctx)) {
4925
4926 rst_ctrl.bits.mask_monitoring = 0;
4927 rst_ctrl.bits.reset_ovfl_pmds = 0;
4928
4929 if (state == PFM_CTX_LOADED)
4930 ret = pfm_buf_fmt_restart_active(fmt, current, &rst_ctrl, ctx->ctx_smpl_hdr, regs);
4931 else
4932 ret = pfm_buf_fmt_restart(fmt, current, &rst_ctrl, ctx->ctx_smpl_hdr, regs);
4933 } else {
4934 rst_ctrl.bits.mask_monitoring = 0;
4935 rst_ctrl.bits.reset_ovfl_pmds = 1;
4936 }
4937
4938 if (ret == 0) {
4939 if (rst_ctrl.bits.reset_ovfl_pmds) {
4940 pfm_reset_regs(ctx, &ovfl_regs, PFM_PMD_LONG_RESET);
4941 }
4942 if (rst_ctrl.bits.mask_monitoring == 0) {
4943 DPRINT(("resuming monitoring\n"));
4944 if (ctx->ctx_state == PFM_CTX_MASKED) pfm_restore_monitoring(current);
4945 } else {
4946 DPRINT(("stopping monitoring\n"));
4947
4948 }
4949 ctx->ctx_state = PFM_CTX_LOADED;
4950 }
4951}
4952
4953
4954
4955
4956
4957static void
4958pfm_context_force_terminate(pfm_context_t *ctx, struct pt_regs *regs)
4959{
4960 int ret;
4961
4962 DPRINT(("entering for [%d]\n", task_pid_nr(current)));
4963
4964 ret = pfm_context_unload(ctx, NULL, 0, regs);
4965 if (ret) {
4966 printk(KERN_ERR "pfm_context_force_terminate: [%d] unloaded failed with %d\n", task_pid_nr(current), ret);
4967 }
4968
4969
4970
4971
4972 wake_up_interruptible(&ctx->ctx_zombieq);
4973
4974
4975
4976
4977
4978
4979}
4980
4981static int pfm_ovfl_notify_user(pfm_context_t *ctx, unsigned long ovfl_pmds);
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992void
4993pfm_handle_work(void)
4994{
4995 pfm_context_t *ctx;
4996 struct pt_regs *regs;
4997 unsigned long flags, dummy_flags;
4998 unsigned long ovfl_regs;
4999 unsigned int reason;
5000 int ret;
5001
5002 ctx = PFM_GET_CTX(current);
5003 if (ctx == NULL) {
5004 printk(KERN_ERR "perfmon: [%d] has no PFM context\n",
5005 task_pid_nr(current));
5006 return;
5007 }
5008
5009 PROTECT_CTX(ctx, flags);
5010
5011 PFM_SET_WORK_PENDING(current, 0);
5012
5013 regs = task_pt_regs(current);
5014
5015
5016
5017
5018 reason = ctx->ctx_fl_trap_reason;
5019 ctx->ctx_fl_trap_reason = PFM_TRAP_REASON_NONE;
5020 ovfl_regs = ctx->ctx_ovfl_regs[0];
5021
5022 DPRINT(("reason=%d state=%d\n", reason, ctx->ctx_state));
5023
5024
5025
5026
5027 if (ctx->ctx_fl_going_zombie || ctx->ctx_state == PFM_CTX_ZOMBIE)
5028 goto do_zombie;
5029
5030
5031 if (reason == PFM_TRAP_REASON_RESET)
5032 goto skip_blocking;
5033
5034
5035
5036
5037
5038 UNPROTECT_CTX(ctx, flags);
5039
5040
5041
5042
5043 local_irq_enable();
5044
5045 DPRINT(("before block sleeping\n"));
5046
5047
5048
5049
5050
5051 ret = wait_for_completion_interruptible(&ctx->ctx_restart_done);
5052
5053 DPRINT(("after block sleeping ret=%d\n", ret));
5054
5055
5056
5057
5058
5059
5060
5061 PROTECT_CTX(ctx, dummy_flags);
5062
5063
5064
5065
5066
5067
5068
5069 ovfl_regs = ctx->ctx_ovfl_regs[0];
5070
5071 if (ctx->ctx_fl_going_zombie) {
5072do_zombie:
5073 DPRINT(("context is zombie, bailing out\n"));
5074 pfm_context_force_terminate(ctx, regs);
5075 goto nothing_to_do;
5076 }
5077
5078
5079
5080 if (ret < 0)
5081 goto nothing_to_do;
5082
5083skip_blocking:
5084 pfm_resume_after_ovfl(ctx, ovfl_regs, regs);
5085 ctx->ctx_ovfl_regs[0] = 0UL;
5086
5087nothing_to_do:
5088
5089
5090
5091 UNPROTECT_CTX(ctx, flags);
5092}
5093
5094static int
5095pfm_notify_user(pfm_context_t *ctx, pfm_msg_t *msg)
5096{
5097 if (ctx->ctx_state == PFM_CTX_ZOMBIE) {
5098 DPRINT(("ignoring overflow notification, owner is zombie\n"));
5099 return 0;
5100 }
5101
5102 DPRINT(("waking up somebody\n"));
5103
5104 if (msg) wake_up_interruptible(&ctx->ctx_msgq_wait);
5105
5106
5107
5108
5109
5110 kill_fasync (&ctx->ctx_async_queue, SIGIO, POLL_IN);
5111
5112 return 0;
5113}
5114
5115static int
5116pfm_ovfl_notify_user(pfm_context_t *ctx, unsigned long ovfl_pmds)
5117{
5118 pfm_msg_t *msg = NULL;
5119
5120 if (ctx->ctx_fl_no_msg == 0) {
5121 msg = pfm_get_new_msg(ctx);
5122 if (msg == NULL) {
5123 printk(KERN_ERR "perfmon: pfm_ovfl_notify_user no more notification msgs\n");
5124 return -1;
5125 }
5126
5127 msg->pfm_ovfl_msg.msg_type = PFM_MSG_OVFL;
5128 msg->pfm_ovfl_msg.msg_ctx_fd = ctx->ctx_fd;
5129 msg->pfm_ovfl_msg.msg_active_set = 0;
5130 msg->pfm_ovfl_msg.msg_ovfl_pmds[0] = ovfl_pmds;
5131 msg->pfm_ovfl_msg.msg_ovfl_pmds[1] = 0UL;
5132 msg->pfm_ovfl_msg.msg_ovfl_pmds[2] = 0UL;
5133 msg->pfm_ovfl_msg.msg_ovfl_pmds[3] = 0UL;
5134 msg->pfm_ovfl_msg.msg_tstamp = 0UL;
5135 }
5136
5137 DPRINT(("ovfl msg: msg=%p no_msg=%d fd=%d ovfl_pmds=0x%lx\n",
5138 msg,
5139 ctx->ctx_fl_no_msg,
5140 ctx->ctx_fd,
5141 ovfl_pmds));
5142
5143 return pfm_notify_user(ctx, msg);
5144}
5145
5146static int
5147pfm_end_notify_user(pfm_context_t *ctx)
5148{
5149 pfm_msg_t *msg;
5150
5151 msg = pfm_get_new_msg(ctx);
5152 if (msg == NULL) {
5153 printk(KERN_ERR "perfmon: pfm_end_notify_user no more notification msgs\n");
5154 return -1;
5155 }
5156
5157 memset(msg, 0, sizeof(*msg));
5158
5159 msg->pfm_end_msg.msg_type = PFM_MSG_END;
5160 msg->pfm_end_msg.msg_ctx_fd = ctx->ctx_fd;
5161 msg->pfm_ovfl_msg.msg_tstamp = 0UL;
5162
5163 DPRINT(("end msg: msg=%p no_msg=%d ctx_fd=%d\n",
5164 msg,
5165 ctx->ctx_fl_no_msg,
5166 ctx->ctx_fd));
5167
5168 return pfm_notify_user(ctx, msg);
5169}
5170
5171
5172
5173
5174
5175static void pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx,
5176 unsigned long pmc0, struct pt_regs *regs)
5177{
5178 pfm_ovfl_arg_t *ovfl_arg;
5179 unsigned long mask;
5180 unsigned long old_val, ovfl_val, new_val;
5181 unsigned long ovfl_notify = 0UL, ovfl_pmds = 0UL, smpl_pmds = 0UL, reset_pmds;
5182 unsigned long tstamp;
5183 pfm_ovfl_ctrl_t ovfl_ctrl;
5184 unsigned int i, has_smpl;
5185 int must_notify = 0;
5186
5187 if (unlikely(ctx->ctx_state == PFM_CTX_ZOMBIE)) goto stop_monitoring;
5188
5189
5190
5191
5192 if (unlikely((pmc0 & 0x1) == 0)) goto sanity_check;
5193
5194 tstamp = ia64_get_itc();
5195 mask = pmc0 >> PMU_FIRST_COUNTER;
5196 ovfl_val = pmu_conf->ovfl_val;
5197 has_smpl = CTX_HAS_SMPL(ctx);
5198
5199 DPRINT_ovfl(("pmc0=0x%lx pid=%d iip=0x%lx, %s "
5200 "used_pmds=0x%lx\n",
5201 pmc0,
5202 task ? task_pid_nr(task): -1,
5203 (regs ? regs->cr_iip : 0),
5204 CTX_OVFL_NOBLOCK(ctx) ? "nonblocking" : "blocking",
5205 ctx->ctx_used_pmds[0]));
5206
5207
5208
5209
5210
5211
5212 for (i = PMU_FIRST_COUNTER; mask ; i++, mask >>= 1) {
5213
5214
5215 if ((mask & 0x1) == 0) continue;
5216
5217
5218
5219
5220
5221
5222
5223 old_val = new_val = ctx->ctx_pmds[i].val;
5224 new_val += 1 + ovfl_val;
5225 ctx->ctx_pmds[i].val = new_val;
5226
5227
5228
5229
5230 if (likely(old_val > new_val)) {
5231 ovfl_pmds |= 1UL << i;
5232 if (PMC_OVFL_NOTIFY(ctx, i)) ovfl_notify |= 1UL << i;
5233 }
5234
5235 DPRINT_ovfl(("ctx_pmd[%d].val=0x%lx old_val=0x%lx pmd=0x%lx ovfl_pmds=0x%lx ovfl_notify=0x%lx\n",
5236 i,
5237 new_val,
5238 old_val,
5239 ia64_get_pmd(i) & ovfl_val,
5240 ovfl_pmds,
5241 ovfl_notify));
5242 }
5243
5244
5245
5246
5247 if (ovfl_pmds == 0UL) return;
5248
5249
5250
5251
5252 ovfl_ctrl.val = 0;
5253 reset_pmds = 0UL;
5254
5255
5256
5257
5258
5259 if (has_smpl) {
5260 unsigned long start_cycles, end_cycles;
5261 unsigned long pmd_mask;
5262 int j, k, ret = 0;
5263 int this_cpu = smp_processor_id();
5264
5265 pmd_mask = ovfl_pmds >> PMU_FIRST_COUNTER;
5266 ovfl_arg = &ctx->ctx_ovfl_arg;
5267
5268 prefetch(ctx->ctx_smpl_hdr);
5269
5270 for(i=PMU_FIRST_COUNTER; pmd_mask && ret == 0; i++, pmd_mask >>=1) {
5271
5272 mask = 1UL << i;
5273
5274 if ((pmd_mask & 0x1) == 0) continue;
5275
5276 ovfl_arg->ovfl_pmd = (unsigned char )i;
5277 ovfl_arg->ovfl_notify = ovfl_notify & mask ? 1 : 0;
5278 ovfl_arg->active_set = 0;
5279 ovfl_arg->ovfl_ctrl.val = 0;
5280 ovfl_arg->smpl_pmds[0] = smpl_pmds = ctx->ctx_pmds[i].smpl_pmds[0];
5281
5282 ovfl_arg->pmd_value = ctx->ctx_pmds[i].val;
5283 ovfl_arg->pmd_last_reset = ctx->ctx_pmds[i].lval;
5284 ovfl_arg->pmd_eventid = ctx->ctx_pmds[i].eventid;
5285
5286
5287
5288
5289
5290 if (smpl_pmds) {
5291 for(j=0, k=0; smpl_pmds; j++, smpl_pmds >>=1) {
5292 if ((smpl_pmds & 0x1) == 0) continue;
5293 ovfl_arg->smpl_pmds_values[k++] = PMD_IS_COUNTING(j) ? pfm_read_soft_counter(ctx, j) : ia64_get_pmd(j);
5294 DPRINT_ovfl(("smpl_pmd[%d]=pmd%u=0x%lx\n", k-1, j, ovfl_arg->smpl_pmds_values[k-1]));
5295 }
5296 }
5297
5298 pfm_stats[this_cpu].pfm_smpl_handler_calls++;
5299
5300 start_cycles = ia64_get_itc();
5301
5302
5303
5304
5305 ret = (*ctx->ctx_buf_fmt->fmt_handler)(task, ctx->ctx_smpl_hdr, ovfl_arg, regs, tstamp);
5306
5307 end_cycles = ia64_get_itc();
5308
5309
5310
5311
5312
5313 ovfl_ctrl.bits.notify_user |= ovfl_arg->ovfl_ctrl.bits.notify_user;
5314 ovfl_ctrl.bits.block_task |= ovfl_arg->ovfl_ctrl.bits.block_task;
5315 ovfl_ctrl.bits.mask_monitoring |= ovfl_arg->ovfl_ctrl.bits.mask_monitoring;
5316
5317
5318
5319 if (ovfl_arg->ovfl_ctrl.bits.reset_ovfl_pmds) reset_pmds |= mask;
5320
5321 pfm_stats[this_cpu].pfm_smpl_handler_cycles += end_cycles - start_cycles;
5322 }
5323
5324
5325
5326 if (ret && pmd_mask) {
5327 DPRINT(("handler aborts leftover ovfl_pmds=0x%lx\n",
5328 pmd_mask<<PMU_FIRST_COUNTER));
5329 }
5330
5331
5332
5333 ovfl_pmds &= ~reset_pmds;
5334 } else {
5335
5336
5337
5338
5339 ovfl_ctrl.bits.notify_user = ovfl_notify ? 1 : 0;
5340 ovfl_ctrl.bits.block_task = ovfl_notify ? 1 : 0;
5341 ovfl_ctrl.bits.mask_monitoring = ovfl_notify ? 1 : 0;
5342 ovfl_ctrl.bits.reset_ovfl_pmds = ovfl_notify ? 0 : 1;
5343
5344
5345
5346 if (ovfl_notify == 0) reset_pmds = ovfl_pmds;
5347 }
5348
5349 DPRINT_ovfl(("ovfl_pmds=0x%lx reset_pmds=0x%lx\n", ovfl_pmds, reset_pmds));
5350
5351
5352
5353
5354 if (reset_pmds) {
5355 unsigned long bm = reset_pmds;
5356 pfm_reset_regs(ctx, &bm, PFM_PMD_SHORT_RESET);
5357 }
5358
5359 if (ovfl_notify && ovfl_ctrl.bits.notify_user) {
5360
5361
5362
5363 ctx->ctx_ovfl_regs[0] = ovfl_pmds;
5364
5365
5366
5367
5368 if (CTX_OVFL_NOBLOCK(ctx) == 0 && ovfl_ctrl.bits.block_task) {
5369
5370 ctx->ctx_fl_trap_reason = PFM_TRAP_REASON_BLOCK;
5371
5372
5373
5374
5375 PFM_SET_WORK_PENDING(task, 1);
5376
5377
5378
5379
5380
5381 set_notify_resume(task);
5382 }
5383
5384
5385
5386
5387 must_notify = 1;
5388 }
5389
5390 DPRINT_ovfl(("owner [%d] pending=%ld reason=%u ovfl_pmds=0x%lx ovfl_notify=0x%lx masked=%d\n",
5391 GET_PMU_OWNER() ? task_pid_nr(GET_PMU_OWNER()) : -1,
5392 PFM_GET_WORK_PENDING(task),
5393 ctx->ctx_fl_trap_reason,
5394 ovfl_pmds,
5395 ovfl_notify,
5396 ovfl_ctrl.bits.mask_monitoring ? 1 : 0));
5397
5398
5399
5400 if (ovfl_ctrl.bits.mask_monitoring) {
5401 pfm_mask_monitoring(task);
5402 ctx->ctx_state = PFM_CTX_MASKED;
5403 ctx->ctx_fl_can_restart = 1;
5404 }
5405
5406
5407
5408
5409 if (must_notify) pfm_ovfl_notify_user(ctx, ovfl_notify);
5410
5411 return;
5412
5413sanity_check:
5414 printk(KERN_ERR "perfmon: CPU%d overflow handler [%d] pmc0=0x%lx\n",
5415 smp_processor_id(),
5416 task ? task_pid_nr(task) : -1,
5417 pmc0);
5418 return;
5419
5420stop_monitoring:
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449 DPRINT(("ctx is zombie for [%d], converted to spurious\n", task ? task_pid_nr(task): -1));
5450 pfm_clear_psr_up();
5451 ia64_psr(regs)->up = 0;
5452 ia64_psr(regs)->sp = 1;
5453 return;
5454}
5455
5456static int
5457pfm_do_interrupt_handler(void *arg, struct pt_regs *regs)
5458{
5459 struct task_struct *task;
5460 pfm_context_t *ctx;
5461 unsigned long flags;
5462 u64 pmc0;
5463 int this_cpu = smp_processor_id();
5464 int retval = 0;
5465
5466 pfm_stats[this_cpu].pfm_ovfl_intr_count++;
5467
5468
5469
5470
5471 pmc0 = ia64_get_pmc(0);
5472
5473 task = GET_PMU_OWNER();
5474 ctx = GET_PMU_CTX();
5475
5476
5477
5478
5479
5480 if (PMC0_HAS_OVFL(pmc0) && task) {
5481
5482
5483
5484
5485
5486 if (!ctx) goto report_spurious1;
5487
5488 if (ctx->ctx_fl_system == 0 && (task->thread.flags & IA64_THREAD_PM_VALID) == 0)
5489 goto report_spurious2;
5490
5491 PROTECT_CTX_NOPRINT(ctx, flags);
5492
5493 pfm_overflow_handler(task, ctx, pmc0, regs);
5494
5495 UNPROTECT_CTX_NOPRINT(ctx, flags);
5496
5497 } else {
5498 pfm_stats[this_cpu].pfm_spurious_ovfl_intr_count++;
5499 retval = -1;
5500 }
5501
5502
5503
5504 pfm_unfreeze_pmu();
5505
5506 return retval;
5507
5508report_spurious1:
5509 printk(KERN_INFO "perfmon: spurious overflow interrupt on CPU%d: process %d has no PFM context\n",
5510 this_cpu, task_pid_nr(task));
5511 pfm_unfreeze_pmu();
5512 return -1;
5513report_spurious2:
5514 printk(KERN_INFO "perfmon: spurious overflow interrupt on CPU%d: process %d, invalid flag\n",
5515 this_cpu,
5516 task_pid_nr(task));
5517 pfm_unfreeze_pmu();
5518 return -1;
5519}
5520
5521static irqreturn_t
5522pfm_interrupt_handler(int irq, void *arg)
5523{
5524 unsigned long start_cycles, total_cycles;
5525 unsigned long min, max;
5526 int this_cpu;
5527 int ret;
5528 struct pt_regs *regs = get_irq_regs();
5529
5530 this_cpu = get_cpu();
5531 if (likely(!pfm_alt_intr_handler)) {
5532 min = pfm_stats[this_cpu].pfm_ovfl_intr_cycles_min;
5533 max = pfm_stats[this_cpu].pfm_ovfl_intr_cycles_max;
5534
5535 start_cycles = ia64_get_itc();
5536
5537 ret = pfm_do_interrupt_handler(arg, regs);
5538
5539 total_cycles = ia64_get_itc();
5540
5541
5542
5543
5544 if (likely(ret == 0)) {
5545 total_cycles -= start_cycles;
5546
5547 if (total_cycles < min) pfm_stats[this_cpu].pfm_ovfl_intr_cycles_min = total_cycles;
5548 if (total_cycles > max) pfm_stats[this_cpu].pfm_ovfl_intr_cycles_max = total_cycles;
5549
5550 pfm_stats[this_cpu].pfm_ovfl_intr_cycles += total_cycles;
5551 }
5552 }
5553 else {
5554 (*pfm_alt_intr_handler->handler)(irq, arg, regs);
5555 }
5556
5557 put_cpu();
5558 return IRQ_HANDLED;
5559}
5560
5561
5562
5563
5564
5565#define PFM_PROC_SHOW_HEADER ((void *)(long)nr_cpu_ids+1)
5566
5567static void *
5568pfm_proc_start(struct seq_file *m, loff_t *pos)
5569{
5570 if (*pos == 0) {
5571 return PFM_PROC_SHOW_HEADER;
5572 }
5573
5574 while (*pos <= nr_cpu_ids) {
5575 if (cpu_online(*pos - 1)) {
5576 return (void *)*pos;
5577 }
5578 ++*pos;
5579 }
5580 return NULL;
5581}
5582
5583static void *
5584pfm_proc_next(struct seq_file *m, void *v, loff_t *pos)
5585{
5586 ++*pos;
5587 return pfm_proc_start(m, pos);
5588}
5589
5590static void
5591pfm_proc_stop(struct seq_file *m, void *v)
5592{
5593}
5594
5595static void
5596pfm_proc_show_header(struct seq_file *m)
5597{
5598 struct list_head * pos;
5599 pfm_buffer_fmt_t * entry;
5600 unsigned long flags;
5601
5602 seq_printf(m,
5603 "perfmon version : %u.%u\n"
5604 "model : %s\n"
5605 "fastctxsw : %s\n"
5606 "expert mode : %s\n"
5607 "ovfl_mask : 0x%lx\n"
5608 "PMU flags : 0x%x\n",
5609 PFM_VERSION_MAJ, PFM_VERSION_MIN,
5610 pmu_conf->pmu_name,
5611 pfm_sysctl.fastctxsw > 0 ? "Yes": "No",
5612 pfm_sysctl.expert_mode > 0 ? "Yes": "No",
5613 pmu_conf->ovfl_val,
5614 pmu_conf->flags);
5615
5616 LOCK_PFS(flags);
5617
5618 seq_printf(m,
5619 "proc_sessions : %u\n"
5620 "sys_sessions : %u\n"
5621 "sys_use_dbregs : %u\n"
5622 "ptrace_use_dbregs : %u\n",
5623 pfm_sessions.pfs_task_sessions,
5624 pfm_sessions.pfs_sys_sessions,
5625 pfm_sessions.pfs_sys_use_dbregs,
5626 pfm_sessions.pfs_ptrace_use_dbregs);
5627
5628 UNLOCK_PFS(flags);
5629
5630 spin_lock(&pfm_buffer_fmt_lock);
5631
5632 list_for_each(pos, &pfm_buffer_fmt_list) {
5633 entry = list_entry(pos, pfm_buffer_fmt_t, fmt_list);
5634 seq_printf(m, "format : %16phD %s\n",
5635 entry->fmt_uuid, entry->fmt_name);
5636 }
5637 spin_unlock(&pfm_buffer_fmt_lock);
5638
5639}
5640
5641static int
5642pfm_proc_show(struct seq_file *m, void *v)
5643{
5644 unsigned long psr;
5645 unsigned int i;
5646 int cpu;
5647
5648 if (v == PFM_PROC_SHOW_HEADER) {
5649 pfm_proc_show_header(m);
5650 return 0;
5651 }
5652
5653
5654
5655 cpu = (long)v - 1;
5656 seq_printf(m,
5657 "CPU%-2d overflow intrs : %lu\n"
5658 "CPU%-2d overflow cycles : %lu\n"
5659 "CPU%-2d overflow min : %lu\n"
5660 "CPU%-2d overflow max : %lu\n"
5661 "CPU%-2d smpl handler calls : %lu\n"
5662 "CPU%-2d smpl handler cycles : %lu\n"
5663 "CPU%-2d spurious intrs : %lu\n"
5664 "CPU%-2d replay intrs : %lu\n"
5665 "CPU%-2d syst_wide : %d\n"
5666 "CPU%-2d dcr_pp : %d\n"
5667 "CPU%-2d exclude idle : %d\n"
5668 "CPU%-2d owner : %d\n"
5669 "CPU%-2d context : %p\n"
5670 "CPU%-2d activations : %lu\n",
5671 cpu, pfm_stats[cpu].pfm_ovfl_intr_count,
5672 cpu, pfm_stats[cpu].pfm_ovfl_intr_cycles,
5673 cpu, pfm_stats[cpu].pfm_ovfl_intr_cycles_min,
5674 cpu, pfm_stats[cpu].pfm_ovfl_intr_cycles_max,
5675 cpu, pfm_stats[cpu].pfm_smpl_handler_calls,
5676 cpu, pfm_stats[cpu].pfm_smpl_handler_cycles,
5677 cpu, pfm_stats[cpu].pfm_spurious_ovfl_intr_count,
5678 cpu, pfm_stats[cpu].pfm_replay_ovfl_intr_count,
5679 cpu, pfm_get_cpu_data(pfm_syst_info, cpu) & PFM_CPUINFO_SYST_WIDE ? 1 : 0,
5680 cpu, pfm_get_cpu_data(pfm_syst_info, cpu) & PFM_CPUINFO_DCR_PP ? 1 : 0,
5681 cpu, pfm_get_cpu_data(pfm_syst_info, cpu) & PFM_CPUINFO_EXCL_IDLE ? 1 : 0,
5682 cpu, pfm_get_cpu_data(pmu_owner, cpu) ? pfm_get_cpu_data(pmu_owner, cpu)->pid: -1,
5683 cpu, pfm_get_cpu_data(pmu_ctx, cpu),
5684 cpu, pfm_get_cpu_data(pmu_activation_number, cpu));
5685
5686 if (num_online_cpus() == 1 && pfm_sysctl.debug > 0) {
5687
5688 psr = pfm_get_psr();
5689
5690 ia64_srlz_d();
5691
5692 seq_printf(m,
5693 "CPU%-2d psr : 0x%lx\n"
5694 "CPU%-2d pmc0 : 0x%lx\n",
5695 cpu, psr,
5696 cpu, ia64_get_pmc(0));
5697
5698 for (i=0; PMC_IS_LAST(i) == 0; i++) {
5699 if (PMC_IS_COUNTING(i) == 0) continue;
5700 seq_printf(m,
5701 "CPU%-2d pmc%u : 0x%lx\n"
5702 "CPU%-2d pmd%u : 0x%lx\n",
5703 cpu, i, ia64_get_pmc(i),
5704 cpu, i, ia64_get_pmd(i));
5705 }
5706 }
5707 return 0;
5708}
5709
5710const struct seq_operations pfm_seq_ops = {
5711 .start = pfm_proc_start,
5712 .next = pfm_proc_next,
5713 .stop = pfm_proc_stop,
5714 .show = pfm_proc_show
5715};
5716
5717static int
5718pfm_proc_open(struct inode *inode, struct file *file)
5719{
5720 return seq_open(file, &pfm_seq_ops);
5721}
5722
5723
5724
5725
5726
5727
5728
5729
5730void
5731pfm_syst_wide_update_task(struct task_struct *task, unsigned long info, int is_ctxswin)
5732{
5733 struct pt_regs *regs;
5734 unsigned long dcr;
5735 unsigned long dcr_pp;
5736
5737 dcr_pp = info & PFM_CPUINFO_DCR_PP ? 1 : 0;
5738
5739
5740
5741
5742
5743 if ((info & PFM_CPUINFO_EXCL_IDLE) == 0 || task->pid) {
5744 regs = task_pt_regs(task);
5745 ia64_psr(regs)->pp = is_ctxswin ? dcr_pp : 0;
5746 return;
5747 }
5748
5749
5750
5751 if (dcr_pp) {
5752 dcr = ia64_getreg(_IA64_REG_CR_DCR);
5753
5754
5755
5756 if (is_ctxswin) {
5757
5758 ia64_setreg(_IA64_REG_CR_DCR, dcr & ~IA64_DCR_PP);
5759 pfm_clear_psr_pp();
5760 ia64_srlz_i();
5761 return;
5762 }
5763
5764
5765
5766
5767
5768
5769
5770 ia64_setreg(_IA64_REG_CR_DCR, dcr |IA64_DCR_PP);
5771 pfm_set_psr_pp();
5772 ia64_srlz_i();
5773 }
5774}
5775
5776#ifdef CONFIG_SMP
5777
5778static void
5779pfm_force_cleanup(pfm_context_t *ctx, struct pt_regs *regs)
5780{
5781 struct task_struct *task = ctx->ctx_task;
5782
5783 ia64_psr(regs)->up = 0;
5784 ia64_psr(regs)->sp = 1;
5785
5786 if (GET_PMU_OWNER() == task) {
5787 DPRINT(("cleared ownership for [%d]\n",
5788 task_pid_nr(ctx->ctx_task)));
5789 SET_PMU_OWNER(NULL, NULL);
5790 }
5791
5792
5793
5794
5795 PFM_SET_WORK_PENDING(task, 0);
5796
5797 task->thread.pfm_context = NULL;
5798 task->thread.flags &= ~IA64_THREAD_PM_VALID;
5799
5800 DPRINT(("force cleanup for [%d]\n", task_pid_nr(task)));
5801}
5802
5803
5804
5805
5806
5807void
5808pfm_save_regs(struct task_struct *task)
5809{
5810 pfm_context_t *ctx;
5811 unsigned long flags;
5812 u64 psr;
5813
5814
5815 ctx = PFM_GET_CTX(task);
5816 if (ctx == NULL) return;
5817
5818
5819
5820
5821
5822
5823 flags = pfm_protect_ctx_ctxsw(ctx);
5824
5825 if (ctx->ctx_state == PFM_CTX_ZOMBIE) {
5826 struct pt_regs *regs = task_pt_regs(task);
5827
5828 pfm_clear_psr_up();
5829
5830 pfm_force_cleanup(ctx, regs);
5831
5832 BUG_ON(ctx->ctx_smpl_hdr);
5833
5834 pfm_unprotect_ctx_ctxsw(ctx, flags);
5835
5836 pfm_context_free(ctx);
5837 return;
5838 }
5839
5840
5841
5842
5843 ia64_srlz_d();
5844 psr = pfm_get_psr();
5845
5846 BUG_ON(psr & (IA64_PSR_I));
5847
5848
5849
5850
5851
5852
5853
5854
5855 pfm_clear_psr_up();
5856
5857
5858
5859
5860 ctx->ctx_saved_psr_up = psr & IA64_PSR_UP;
5861
5862
5863
5864
5865
5866
5867 SET_PMU_OWNER(NULL, NULL);
5868
5869
5870
5871
5872
5873
5874 pfm_save_pmds(ctx->th_pmds, ctx->ctx_used_pmds[0]);
5875
5876
5877
5878
5879
5880
5881 ctx->th_pmcs[0] = ia64_get_pmc(0);
5882
5883
5884
5885
5886 if (ctx->th_pmcs[0] & ~0x1UL) pfm_unfreeze_pmu();
5887
5888
5889
5890
5891
5892 pfm_unprotect_ctx_ctxsw(ctx, flags);
5893}
5894
5895#else
5896void
5897pfm_save_regs(struct task_struct *task)
5898{
5899 pfm_context_t *ctx;
5900 u64 psr;
5901
5902 ctx = PFM_GET_CTX(task);
5903 if (ctx == NULL) return;
5904
5905
5906
5907
5908 psr = pfm_get_psr();
5909
5910 BUG_ON(psr & (IA64_PSR_I));
5911
5912
5913
5914
5915
5916
5917
5918
5919 pfm_clear_psr_up();
5920
5921
5922
5923
5924 ctx->ctx_saved_psr_up = psr & IA64_PSR_UP;
5925}
5926
5927static void
5928pfm_lazy_save_regs (struct task_struct *task)
5929{
5930 pfm_context_t *ctx;
5931 unsigned long flags;
5932
5933 { u64 psr = pfm_get_psr();
5934 BUG_ON(psr & IA64_PSR_UP);
5935 }
5936
5937 ctx = PFM_GET_CTX(task);
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948 PROTECT_CTX(ctx,flags);
5949
5950
5951
5952
5953
5954
5955
5956
5957 SET_PMU_OWNER(NULL, NULL);
5958
5959
5960
5961
5962 pfm_save_pmds(ctx->th_pmds, ctx->ctx_used_pmds[0]);
5963
5964
5965
5966
5967
5968
5969 ctx->th_pmcs[0] = ia64_get_pmc(0);
5970
5971
5972
5973
5974 if (ctx->th_pmcs[0] & ~0x1UL) pfm_unfreeze_pmu();
5975
5976
5977
5978
5979
5980
5981 UNPROTECT_CTX(ctx,flags);
5982}
5983#endif
5984
5985#ifdef CONFIG_SMP
5986
5987
5988
5989void
5990pfm_load_regs (struct task_struct *task)
5991{
5992 pfm_context_t *ctx;
5993 unsigned long pmc_mask = 0UL, pmd_mask = 0UL;
5994 unsigned long flags;
5995 u64 psr, psr_up;
5996 int need_irq_resend;
5997
5998 ctx = PFM_GET_CTX(task);
5999 if (unlikely(ctx == NULL)) return;
6000
6001 BUG_ON(GET_PMU_OWNER());
6002
6003
6004
6005
6006 if (unlikely((task->thread.flags & IA64_THREAD_PM_VALID) == 0)) return;
6007
6008
6009
6010
6011
6012
6013 flags = pfm_protect_ctx_ctxsw(ctx);
6014 psr = pfm_get_psr();
6015
6016 need_irq_resend = pmu_conf->flags & PFM_PMU_IRQ_RESEND;
6017
6018 BUG_ON(psr & (IA64_PSR_UP|IA64_PSR_PP));
6019 BUG_ON(psr & IA64_PSR_I);
6020
6021 if (unlikely(ctx->ctx_state == PFM_CTX_ZOMBIE)) {
6022 struct pt_regs *regs = task_pt_regs(task);
6023
6024 BUG_ON(ctx->ctx_smpl_hdr);
6025
6026 pfm_force_cleanup(ctx, regs);
6027
6028 pfm_unprotect_ctx_ctxsw(ctx, flags);
6029
6030
6031
6032
6033 pfm_context_free(ctx);
6034
6035 return;
6036 }
6037
6038
6039
6040
6041
6042 if (ctx->ctx_fl_using_dbreg) {
6043 pfm_restore_ibrs(ctx->ctx_ibrs, pmu_conf->num_ibrs);
6044 pfm_restore_dbrs(ctx->ctx_dbrs, pmu_conf->num_dbrs);
6045 }
6046
6047
6048
6049 psr_up = ctx->ctx_saved_psr_up;
6050
6051
6052
6053
6054
6055 if (GET_LAST_CPU(ctx) == smp_processor_id() && ctx->ctx_last_activation == GET_ACTIVATION()) {
6056
6057
6058
6059
6060 pmc_mask = ctx->ctx_reload_pmcs[0];
6061 pmd_mask = ctx->ctx_reload_pmds[0];
6062
6063 } else {
6064
6065
6066
6067
6068
6069
6070 pmd_mask = pfm_sysctl.fastctxsw ? ctx->ctx_used_pmds[0] : ctx->ctx_all_pmds[0];
6071
6072
6073
6074
6075
6076
6077
6078
6079 pmc_mask = ctx->ctx_all_pmcs[0];
6080 }
6081
6082
6083
6084
6085
6086
6087
6088 if (pmd_mask) pfm_restore_pmds(ctx->th_pmds, pmd_mask);
6089 if (pmc_mask) pfm_restore_pmcs(ctx->th_pmcs, pmc_mask);
6090
6091
6092
6093
6094
6095 if (unlikely(PMC0_HAS_OVFL(ctx->th_pmcs[0]))) {
6096
6097
6098
6099
6100 ia64_set_pmc(0, ctx->th_pmcs[0]);
6101 ia64_srlz_d();
6102 ctx->th_pmcs[0] = 0UL;
6103
6104
6105
6106
6107 if (need_irq_resend) ia64_resend_irq(IA64_PERFMON_VECTOR);
6108
6109 pfm_stats[smp_processor_id()].pfm_replay_ovfl_intr_count++;
6110 }
6111
6112
6113
6114
6115 ctx->ctx_reload_pmcs[0] = 0UL;
6116 ctx->ctx_reload_pmds[0] = 0UL;
6117
6118 SET_LAST_CPU(ctx, smp_processor_id());
6119
6120
6121
6122
6123 INC_ACTIVATION();
6124
6125
6126
6127 SET_ACTIVATION(ctx);
6128
6129
6130
6131
6132 SET_PMU_OWNER(task, ctx);
6133
6134
6135
6136
6137
6138
6139
6140 if (likely(psr_up)) pfm_set_psr_up();
6141
6142
6143
6144
6145 pfm_unprotect_ctx_ctxsw(ctx, flags);
6146}
6147#else
6148
6149
6150
6151
6152void
6153pfm_load_regs (struct task_struct *task)
6154{
6155 pfm_context_t *ctx;
6156 struct task_struct *owner;
6157 unsigned long pmd_mask, pmc_mask;
6158 u64 psr, psr_up;
6159 int need_irq_resend;
6160
6161 owner = GET_PMU_OWNER();
6162 ctx = PFM_GET_CTX(task);
6163 psr = pfm_get_psr();
6164
6165 BUG_ON(psr & (IA64_PSR_UP|IA64_PSR_PP));
6166 BUG_ON(psr & IA64_PSR_I);
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176 if (ctx->ctx_fl_using_dbreg) {
6177 pfm_restore_ibrs(ctx->ctx_ibrs, pmu_conf->num_ibrs);
6178 pfm_restore_dbrs(ctx->ctx_dbrs, pmu_conf->num_dbrs);
6179 }
6180
6181
6182
6183
6184 psr_up = ctx->ctx_saved_psr_up;
6185 need_irq_resend = pmu_conf->flags & PFM_PMU_IRQ_RESEND;
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195 if (likely(owner == task)) {
6196 if (likely(psr_up)) pfm_set_psr_up();
6197 return;
6198 }
6199
6200
6201
6202
6203
6204
6205
6206 if (owner) pfm_lazy_save_regs(owner);
6207
6208
6209
6210
6211
6212
6213
6214 pmd_mask = pfm_sysctl.fastctxsw ? ctx->ctx_used_pmds[0] : ctx->ctx_all_pmds[0];
6215
6216
6217
6218
6219
6220
6221
6222
6223 pmc_mask = ctx->ctx_all_pmcs[0];
6224
6225 pfm_restore_pmds(ctx->th_pmds, pmd_mask);
6226 pfm_restore_pmcs(ctx->th_pmcs, pmc_mask);
6227
6228
6229
6230
6231
6232 if (unlikely(PMC0_HAS_OVFL(ctx->th_pmcs[0]))) {
6233
6234
6235
6236
6237 ia64_set_pmc(0, ctx->th_pmcs[0]);
6238 ia64_srlz_d();
6239
6240 ctx->th_pmcs[0] = 0UL;
6241
6242
6243
6244
6245 if (need_irq_resend) ia64_resend_irq(IA64_PERFMON_VECTOR);
6246
6247 pfm_stats[smp_processor_id()].pfm_replay_ovfl_intr_count++;
6248 }
6249
6250
6251
6252
6253 SET_PMU_OWNER(task, ctx);
6254
6255
6256
6257
6258
6259
6260
6261 if (likely(psr_up)) pfm_set_psr_up();
6262}
6263#endif
6264
6265
6266
6267
6268static void
6269pfm_flush_pmds(struct task_struct *task, pfm_context_t *ctx)
6270{
6271 u64 pmc0;
6272 unsigned long mask2, val, pmd_val, ovfl_val;
6273 int i, can_access_pmu = 0;
6274 int is_self;
6275
6276
6277
6278
6279
6280 is_self = ctx->ctx_task == task ? 1 : 0;
6281
6282
6283
6284
6285
6286
6287
6288
6289 can_access_pmu = (GET_PMU_OWNER() == task) || (ctx->ctx_fl_system && ctx->ctx_cpu == smp_processor_id());
6290 if (can_access_pmu) {
6291
6292
6293
6294
6295
6296
6297
6298
6299 SET_PMU_OWNER(NULL, NULL);
6300 DPRINT(("releasing ownership\n"));
6301
6302
6303
6304
6305
6306
6307 ia64_srlz_d();
6308 pmc0 = ia64_get_pmc(0);
6309
6310
6311
6312
6313 pfm_unfreeze_pmu();
6314 } else {
6315 pmc0 = ctx->th_pmcs[0];
6316
6317
6318
6319 ctx->th_pmcs[0] = 0;
6320 }
6321 ovfl_val = pmu_conf->ovfl_val;
6322
6323
6324
6325
6326
6327
6328 mask2 = ctx->ctx_used_pmds[0];
6329
6330 DPRINT(("is_self=%d ovfl_val=0x%lx mask2=0x%lx\n", is_self, ovfl_val, mask2));
6331
6332 for (i = 0; mask2; i++, mask2>>=1) {
6333
6334
6335 if ((mask2 & 0x1) == 0) continue;
6336
6337
6338
6339
6340 val = pmd_val = can_access_pmu ? ia64_get_pmd(i) : ctx->th_pmds[i];
6341
6342 if (PMD_IS_COUNTING(i)) {
6343 DPRINT(("[%d] pmd[%d] ctx_pmd=0x%lx hw_pmd=0x%lx\n",
6344 task_pid_nr(task),
6345 i,
6346 ctx->ctx_pmds[i].val,
6347 val & ovfl_val));
6348
6349
6350
6351
6352 val = ctx->ctx_pmds[i].val + (val & ovfl_val);
6353
6354
6355
6356
6357
6358
6359 pmd_val = 0UL;
6360
6361
6362
6363
6364 if (pmc0 & (1UL << i)) {
6365 val += 1 + ovfl_val;
6366 DPRINT(("[%d] pmd[%d] overflowed\n", task_pid_nr(task), i));
6367 }
6368 }
6369
6370 DPRINT(("[%d] ctx_pmd[%d]=0x%lx pmd_val=0x%lx\n", task_pid_nr(task), i, val, pmd_val));
6371
6372 if (is_self) ctx->th_pmds[i] = pmd_val;
6373
6374 ctx->ctx_pmds[i].val = val;
6375 }
6376}
6377
6378static struct irqaction perfmon_irqaction = {
6379 .handler = pfm_interrupt_handler,
6380 .name = "perfmon"
6381};
6382
6383static void
6384pfm_alt_save_pmu_state(void *data)
6385{
6386 struct pt_regs *regs;
6387
6388 regs = task_pt_regs(current);
6389
6390 DPRINT(("called\n"));
6391
6392
6393
6394
6395
6396 pfm_clear_psr_up();
6397 pfm_clear_psr_pp();
6398 ia64_psr(regs)->pp = 0;
6399
6400
6401
6402
6403
6404 pfm_freeze_pmu();
6405
6406 ia64_srlz_d();
6407}
6408
6409void
6410pfm_alt_restore_pmu_state(void *data)
6411{
6412 struct pt_regs *regs;
6413
6414 regs = task_pt_regs(current);
6415
6416 DPRINT(("called\n"));
6417
6418
6419
6420
6421
6422 pfm_clear_psr_up();
6423 pfm_clear_psr_pp();
6424 ia64_psr(regs)->pp = 0;
6425
6426
6427
6428
6429 pfm_unfreeze_pmu();
6430
6431 ia64_srlz_d();
6432}
6433
6434int
6435pfm_install_alt_pmu_interrupt(pfm_intr_handler_desc_t *hdl)
6436{
6437 int ret, i;
6438 int reserve_cpu;
6439
6440
6441 if (hdl == NULL || hdl->handler == NULL) return -EINVAL;
6442
6443
6444 if (pfm_alt_intr_handler) return -EBUSY;
6445
6446
6447 if (!spin_trylock(&pfm_alt_install_check)) {
6448 return -EBUSY;
6449 }
6450
6451
6452 for_each_online_cpu(reserve_cpu) {
6453 ret = pfm_reserve_session(NULL, 1, reserve_cpu);
6454 if (ret) goto cleanup_reserve;
6455 }
6456
6457
6458 ret = on_each_cpu(pfm_alt_save_pmu_state, NULL, 1);
6459 if (ret) {
6460 DPRINT(("on_each_cpu() failed: %d\n", ret));
6461 goto cleanup_reserve;
6462 }
6463
6464
6465 pfm_alt_intr_handler = hdl;
6466
6467 spin_unlock(&pfm_alt_install_check);
6468
6469 return 0;
6470
6471cleanup_reserve:
6472 for_each_online_cpu(i) {
6473
6474 if (i >= reserve_cpu) break;
6475
6476 pfm_unreserve_session(NULL, 1, i);
6477 }
6478
6479 spin_unlock(&pfm_alt_install_check);
6480
6481 return ret;
6482}
6483EXPORT_SYMBOL_GPL(pfm_install_alt_pmu_interrupt);
6484
6485int
6486pfm_remove_alt_pmu_interrupt(pfm_intr_handler_desc_t *hdl)
6487{
6488 int i;
6489 int ret;
6490
6491 if (hdl == NULL) return -EINVAL;
6492
6493
6494 if (pfm_alt_intr_handler != hdl) return -EINVAL;
6495
6496
6497 if (!spin_trylock(&pfm_alt_install_check)) {
6498 return -EBUSY;
6499 }
6500
6501 pfm_alt_intr_handler = NULL;
6502
6503 ret = on_each_cpu(pfm_alt_restore_pmu_state, NULL, 1);
6504 if (ret) {
6505 DPRINT(("on_each_cpu() failed: %d\n", ret));
6506 }
6507
6508 for_each_online_cpu(i) {
6509 pfm_unreserve_session(NULL, 1, i);
6510 }
6511
6512 spin_unlock(&pfm_alt_install_check);
6513
6514 return 0;
6515}
6516EXPORT_SYMBOL_GPL(pfm_remove_alt_pmu_interrupt);
6517
6518
6519
6520
6521static int init_pfm_fs(void);
6522
6523static int __init
6524pfm_probe_pmu(void)
6525{
6526 pmu_config_t **p;
6527 int family;
6528
6529 family = local_cpu_data->family;
6530 p = pmu_confs;
6531
6532 while(*p) {
6533 if ((*p)->probe) {
6534 if ((*p)->probe() == 0) goto found;
6535 } else if ((*p)->pmu_family == family || (*p)->pmu_family == 0xff) {
6536 goto found;
6537 }
6538 p++;
6539 }
6540 return -1;
6541found:
6542 pmu_conf = *p;
6543 return 0;
6544}
6545
6546static const struct file_operations pfm_proc_fops = {
6547 .open = pfm_proc_open,
6548 .read = seq_read,
6549 .llseek = seq_lseek,
6550 .release = seq_release,
6551};
6552
6553int __init
6554pfm_init(void)
6555{
6556 unsigned int n, n_counters, i;
6557
6558 printk("perfmon: version %u.%u IRQ %u\n",
6559 PFM_VERSION_MAJ,
6560 PFM_VERSION_MIN,
6561 IA64_PERFMON_VECTOR);
6562
6563 if (pfm_probe_pmu()) {
6564 printk(KERN_INFO "perfmon: disabled, there is no support for processor family %d\n",
6565 local_cpu_data->family);
6566 return -ENODEV;
6567 }
6568
6569
6570
6571
6572
6573 n = 0;
6574 for (i=0; PMC_IS_LAST(i) == 0; i++) {
6575 if (PMC_IS_IMPL(i) == 0) continue;
6576 pmu_conf->impl_pmcs[i>>6] |= 1UL << (i&63);
6577 n++;
6578 }
6579 pmu_conf->num_pmcs = n;
6580
6581 n = 0; n_counters = 0;
6582 for (i=0; PMD_IS_LAST(i) == 0; i++) {
6583 if (PMD_IS_IMPL(i) == 0) continue;
6584 pmu_conf->impl_pmds[i>>6] |= 1UL << (i&63);
6585 n++;
6586 if (PMD_IS_COUNTING(i)) n_counters++;
6587 }
6588 pmu_conf->num_pmds = n;
6589 pmu_conf->num_counters = n_counters;
6590
6591
6592
6593
6594 if (pmu_conf->use_rr_dbregs) {
6595 if (pmu_conf->num_ibrs > IA64_NUM_DBG_REGS) {
6596 printk(KERN_INFO "perfmon: unsupported number of code debug registers (%u)\n", pmu_conf->num_ibrs);
6597 pmu_conf = NULL;
6598 return -1;
6599 }
6600 if (pmu_conf->num_dbrs > IA64_NUM_DBG_REGS) {
6601 printk(KERN_INFO "perfmon: unsupported number of data debug registers (%u)\n", pmu_conf->num_ibrs);
6602 pmu_conf = NULL;
6603 return -1;
6604 }
6605 }
6606
6607 printk("perfmon: %s PMU detected, %u PMCs, %u PMDs, %u counters (%lu bits)\n",
6608 pmu_conf->pmu_name,
6609 pmu_conf->num_pmcs,
6610 pmu_conf->num_pmds,
6611 pmu_conf->num_counters,
6612 ffz(pmu_conf->ovfl_val));
6613
6614
6615 if (pmu_conf->num_pmds >= PFM_NUM_PMD_REGS || pmu_conf->num_pmcs >= PFM_NUM_PMC_REGS) {
6616 printk(KERN_ERR "perfmon: not enough pmc/pmd, perfmon disabled\n");
6617 pmu_conf = NULL;
6618 return -1;
6619 }
6620
6621
6622
6623
6624 perfmon_dir = proc_create("perfmon", S_IRUGO, NULL, &pfm_proc_fops);
6625 if (perfmon_dir == NULL) {
6626 printk(KERN_ERR "perfmon: cannot create /proc entry, perfmon disabled\n");
6627 pmu_conf = NULL;
6628 return -1;
6629 }
6630
6631
6632
6633
6634 pfm_sysctl_header = register_sysctl_table(pfm_sysctl_root);
6635
6636
6637
6638
6639 spin_lock_init(&pfm_sessions.pfs_lock);
6640 spin_lock_init(&pfm_buffer_fmt_lock);
6641
6642 init_pfm_fs();
6643
6644 for(i=0; i < NR_CPUS; i++) pfm_stats[i].pfm_ovfl_intr_cycles_min = ~0UL;
6645
6646 return 0;
6647}
6648
6649__initcall(pfm_init);
6650
6651
6652
6653
6654void
6655pfm_init_percpu (void)
6656{
6657 static int first_time=1;
6658
6659
6660
6661
6662 pfm_clear_psr_pp();
6663 pfm_clear_psr_up();
6664
6665
6666
6667
6668 pfm_unfreeze_pmu();
6669
6670 if (first_time) {
6671 register_percpu_irq(IA64_PERFMON_VECTOR, &perfmon_irqaction);
6672 first_time=0;
6673 }
6674
6675 ia64_setreg(_IA64_REG_CR_PMV, IA64_PERFMON_VECTOR);
6676 ia64_srlz_d();
6677}
6678
6679
6680
6681
6682void
6683dump_pmu_state(const char *from)
6684{
6685 struct task_struct *task;
6686 struct pt_regs *regs;
6687 pfm_context_t *ctx;
6688 unsigned long psr, dcr, info, flags;
6689 int i, this_cpu;
6690
6691 local_irq_save(flags);
6692
6693 this_cpu = smp_processor_id();
6694 regs = task_pt_regs(current);
6695 info = PFM_CPUINFO_GET();
6696 dcr = ia64_getreg(_IA64_REG_CR_DCR);
6697
6698 if (info == 0 && ia64_psr(regs)->pp == 0 && (dcr & IA64_DCR_PP) == 0) {
6699 local_irq_restore(flags);
6700 return;
6701 }
6702
6703 printk("CPU%d from %s() current [%d] iip=0x%lx %s\n",
6704 this_cpu,
6705 from,
6706 task_pid_nr(current),
6707 regs->cr_iip,
6708 current->comm);
6709
6710 task = GET_PMU_OWNER();
6711 ctx = GET_PMU_CTX();
6712
6713 printk("->CPU%d owner [%d] ctx=%p\n", this_cpu, task ? task_pid_nr(task) : -1, ctx);
6714
6715 psr = pfm_get_psr();
6716
6717 printk("->CPU%d pmc0=0x%lx psr.pp=%d psr.up=%d dcr.pp=%d syst_info=0x%lx user_psr.up=%d user_psr.pp=%d\n",
6718 this_cpu,
6719 ia64_get_pmc(0),
6720 psr & IA64_PSR_PP ? 1 : 0,
6721 psr & IA64_PSR_UP ? 1 : 0,
6722 dcr & IA64_DCR_PP ? 1 : 0,
6723 info,
6724 ia64_psr(regs)->up,
6725 ia64_psr(regs)->pp);
6726
6727 ia64_psr(regs)->up = 0;
6728 ia64_psr(regs)->pp = 0;
6729
6730 for (i=1; PMC_IS_LAST(i) == 0; i++) {
6731 if (PMC_IS_IMPL(i) == 0) continue;
6732 printk("->CPU%d pmc[%d]=0x%lx thread_pmc[%d]=0x%lx\n", this_cpu, i, ia64_get_pmc(i), i, ctx->th_pmcs[i]);
6733 }
6734
6735 for (i=1; PMD_IS_LAST(i) == 0; i++) {
6736 if (PMD_IS_IMPL(i) == 0) continue;
6737 printk("->CPU%d pmd[%d]=0x%lx thread_pmd[%d]=0x%lx\n", this_cpu, i, ia64_get_pmd(i), i, ctx->th_pmds[i]);
6738 }
6739
6740 if (ctx) {
6741 printk("->CPU%d ctx_state=%d vaddr=%p addr=%p fd=%d ctx_task=[%d] saved_psr_up=0x%lx\n",
6742 this_cpu,
6743 ctx->ctx_state,
6744 ctx->ctx_smpl_vaddr,
6745 ctx->ctx_smpl_hdr,
6746 ctx->ctx_msgq_head,
6747 ctx->ctx_msgq_tail,
6748 ctx->ctx_saved_psr_up);
6749 }
6750 local_irq_restore(flags);
6751}
6752
6753
6754
6755
6756void
6757pfm_inherit(struct task_struct *task, struct pt_regs *regs)
6758{
6759 struct thread_struct *thread;
6760
6761 DPRINT(("perfmon: pfm_inherit clearing state for [%d]\n", task_pid_nr(task)));
6762
6763 thread = &task->thread;
6764
6765
6766
6767
6768 thread->pfm_context = NULL;
6769
6770 PFM_SET_WORK_PENDING(task, 0);
6771
6772
6773
6774
6775}
6776#else
6777asmlinkage long
6778sys_perfmonctl (int fd, int cmd, void *arg, int count)
6779{
6780 return -ENOSYS;
6781}
6782#endif
6783