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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 int
2149pfm_no_open(struct inode *irrelevant, struct file *dontcare)
2150{
2151 DPRINT(("pfm_no_open called\n"));
2152 return -ENXIO;
2153}
2154
2155
2156
2157static const struct file_operations pfm_file_ops = {
2158 .llseek = no_llseek,
2159 .read = pfm_read,
2160 .write = pfm_write,
2161 .poll = pfm_poll,
2162 .unlocked_ioctl = pfm_ioctl,
2163 .open = pfm_no_open,
2164 .fasync = pfm_fasync,
2165 .release = pfm_close,
2166 .flush = pfm_flush
2167};
2168
2169static char *pfmfs_dname(struct dentry *dentry, char *buffer, int buflen)
2170{
2171 return dynamic_dname(dentry, buffer, buflen, "pfm:[%lu]",
2172 dentry->d_inode->i_ino);
2173}
2174
2175static const struct dentry_operations pfmfs_dentry_operations = {
2176 .d_delete = always_delete_dentry,
2177 .d_dname = pfmfs_dname,
2178};
2179
2180
2181static struct file *
2182pfm_alloc_file(pfm_context_t *ctx)
2183{
2184 struct file *file;
2185 struct inode *inode;
2186 struct path path;
2187 struct qstr this = { .name = "" };
2188
2189
2190
2191
2192 inode = new_inode(pfmfs_mnt->mnt_sb);
2193 if (!inode)
2194 return ERR_PTR(-ENOMEM);
2195
2196 DPRINT(("new inode ino=%ld @%p\n", inode->i_ino, inode));
2197
2198 inode->i_mode = S_IFCHR|S_IRUGO;
2199 inode->i_uid = current_fsuid();
2200 inode->i_gid = current_fsgid();
2201
2202
2203
2204
2205 path.dentry = d_alloc(pfmfs_mnt->mnt_root, &this);
2206 if (!path.dentry) {
2207 iput(inode);
2208 return ERR_PTR(-ENOMEM);
2209 }
2210 path.mnt = mntget(pfmfs_mnt);
2211
2212 d_add(path.dentry, inode);
2213
2214 file = alloc_file(&path, FMODE_READ, &pfm_file_ops);
2215 if (IS_ERR(file)) {
2216 path_put(&path);
2217 return file;
2218 }
2219
2220 file->f_flags = O_RDONLY;
2221 file->private_data = ctx;
2222
2223 return file;
2224}
2225
2226static int
2227pfm_remap_buffer(struct vm_area_struct *vma, unsigned long buf, unsigned long addr, unsigned long size)
2228{
2229 DPRINT(("CPU%d buf=0x%lx addr=0x%lx size=%ld\n", smp_processor_id(), buf, addr, size));
2230
2231 while (size > 0) {
2232 unsigned long pfn = ia64_tpa(buf) >> PAGE_SHIFT;
2233
2234
2235 if (remap_pfn_range(vma, addr, pfn, PAGE_SIZE, PAGE_READONLY))
2236 return -ENOMEM;
2237
2238 addr += PAGE_SIZE;
2239 buf += PAGE_SIZE;
2240 size -= PAGE_SIZE;
2241 }
2242 return 0;
2243}
2244
2245
2246
2247
2248static int
2249pfm_smpl_buffer_alloc(struct task_struct *task, struct file *filp, pfm_context_t *ctx, unsigned long rsize, void **user_vaddr)
2250{
2251 struct mm_struct *mm = task->mm;
2252 struct vm_area_struct *vma = NULL;
2253 unsigned long size;
2254 void *smpl_buf;
2255
2256
2257
2258
2259
2260 size = PAGE_ALIGN(rsize);
2261
2262 DPRINT(("sampling buffer rsize=%lu size=%lu bytes\n", rsize, size));
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272 if (size > task_rlimit(task, RLIMIT_MEMLOCK))
2273 return -ENOMEM;
2274
2275
2276
2277
2278
2279
2280 smpl_buf = pfm_rvmalloc(size);
2281 if (smpl_buf == NULL) {
2282 DPRINT(("Can't allocate sampling buffer\n"));
2283 return -ENOMEM;
2284 }
2285
2286 DPRINT(("smpl_buf @%p\n", smpl_buf));
2287
2288
2289 vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
2290 if (!vma) {
2291 DPRINT(("Cannot allocate vma\n"));
2292 goto error_kmem;
2293 }
2294 INIT_LIST_HEAD(&vma->anon_vma_chain);
2295
2296
2297
2298
2299 vma->vm_mm = mm;
2300 vma->vm_file = get_file(filp);
2301 vma->vm_flags = VM_READ|VM_MAYREAD|VM_DONTEXPAND|VM_DONTDUMP;
2302 vma->vm_page_prot = PAGE_READONLY;
2303
2304
2305
2306
2307
2308
2309 ctx->ctx_smpl_hdr = smpl_buf;
2310 ctx->ctx_smpl_size = size;
2311
2312
2313
2314
2315
2316
2317
2318 down_write(&task->mm->mmap_sem);
2319
2320
2321 vma->vm_start = get_unmapped_area(NULL, 0, size, 0, MAP_PRIVATE|MAP_ANONYMOUS);
2322 if (IS_ERR_VALUE(vma->vm_start)) {
2323 DPRINT(("Cannot find unmapped area for size %ld\n", size));
2324 up_write(&task->mm->mmap_sem);
2325 goto error;
2326 }
2327 vma->vm_end = vma->vm_start + size;
2328 vma->vm_pgoff = vma->vm_start >> PAGE_SHIFT;
2329
2330 DPRINT(("aligned size=%ld, hdr=%p mapped @0x%lx\n", size, ctx->ctx_smpl_hdr, vma->vm_start));
2331
2332
2333 if (pfm_remap_buffer(vma, (unsigned long)smpl_buf, vma->vm_start, size)) {
2334 DPRINT(("Can't remap buffer\n"));
2335 up_write(&task->mm->mmap_sem);
2336 goto error;
2337 }
2338
2339
2340
2341
2342
2343 insert_vm_struct(mm, vma);
2344
2345 vm_stat_account(vma->vm_mm, vma->vm_flags, vma->vm_file,
2346 vma_pages(vma));
2347 up_write(&task->mm->mmap_sem);
2348
2349
2350
2351
2352 ctx->ctx_smpl_vaddr = (void *)vma->vm_start;
2353 *(unsigned long *)user_vaddr = vma->vm_start;
2354
2355 return 0;
2356
2357error:
2358 kmem_cache_free(vm_area_cachep, vma);
2359error_kmem:
2360 pfm_rvfree(smpl_buf, size);
2361
2362 return -ENOMEM;
2363}
2364
2365
2366
2367
2368static int
2369pfm_bad_permissions(struct task_struct *task)
2370{
2371 const struct cred *tcred;
2372 kuid_t uid = current_uid();
2373 kgid_t gid = current_gid();
2374 int ret;
2375
2376 rcu_read_lock();
2377 tcred = __task_cred(task);
2378
2379
2380 DPRINT(("cur: uid=%d gid=%d task: euid=%d suid=%d uid=%d egid=%d sgid=%d\n",
2381 from_kuid(&init_user_ns, uid),
2382 from_kgid(&init_user_ns, gid),
2383 from_kuid(&init_user_ns, tcred->euid),
2384 from_kuid(&init_user_ns, tcred->suid),
2385 from_kuid(&init_user_ns, tcred->uid),
2386 from_kgid(&init_user_ns, tcred->egid),
2387 from_kgid(&init_user_ns, tcred->sgid)));
2388
2389 ret = ((!uid_eq(uid, tcred->euid))
2390 || (!uid_eq(uid, tcred->suid))
2391 || (!uid_eq(uid, tcred->uid))
2392 || (!gid_eq(gid, tcred->egid))
2393 || (!gid_eq(gid, tcred->sgid))
2394 || (!gid_eq(gid, tcred->gid))) && !capable(CAP_SYS_PTRACE);
2395
2396 rcu_read_unlock();
2397 return ret;
2398}
2399
2400static int
2401pfarg_is_sane(struct task_struct *task, pfarg_context_t *pfx)
2402{
2403 int ctx_flags;
2404
2405
2406
2407 ctx_flags = pfx->ctx_flags;
2408
2409 if (ctx_flags & PFM_FL_SYSTEM_WIDE) {
2410
2411
2412
2413
2414 if (ctx_flags & PFM_FL_NOTIFY_BLOCK) {
2415 DPRINT(("cannot use blocking mode when in system wide monitoring\n"));
2416 return -EINVAL;
2417 }
2418 } else {
2419 }
2420
2421
2422 return 0;
2423}
2424
2425static int
2426pfm_setup_buffer_fmt(struct task_struct *task, struct file *filp, pfm_context_t *ctx, unsigned int ctx_flags,
2427 unsigned int cpu, pfarg_context_t *arg)
2428{
2429 pfm_buffer_fmt_t *fmt = NULL;
2430 unsigned long size = 0UL;
2431 void *uaddr = NULL;
2432 void *fmt_arg = NULL;
2433 int ret = 0;
2434#define PFM_CTXARG_BUF_ARG(a) (pfm_buffer_fmt_t *)(a+1)
2435
2436
2437 fmt = pfm_find_buffer_fmt(arg->ctx_smpl_buf_id);
2438 if (fmt == NULL) {
2439 DPRINT(("[%d] cannot find buffer format\n", task_pid_nr(task)));
2440 return -EINVAL;
2441 }
2442
2443
2444
2445
2446 if (fmt->fmt_arg_size) fmt_arg = PFM_CTXARG_BUF_ARG(arg);
2447
2448 ret = pfm_buf_fmt_validate(fmt, task, ctx_flags, cpu, fmt_arg);
2449
2450 DPRINT(("[%d] after validate(0x%x,%d,%p)=%d\n", task_pid_nr(task), ctx_flags, cpu, fmt_arg, ret));
2451
2452 if (ret) goto error;
2453
2454
2455 ctx->ctx_buf_fmt = fmt;
2456 ctx->ctx_fl_is_sampling = 1;
2457
2458
2459
2460
2461 ret = pfm_buf_fmt_getsize(fmt, task, ctx_flags, cpu, fmt_arg, &size);
2462 if (ret) goto error;
2463
2464 if (size) {
2465
2466
2467
2468 ret = pfm_smpl_buffer_alloc(current, filp, ctx, size, &uaddr);
2469 if (ret) goto error;
2470
2471
2472 arg->ctx_smpl_vaddr = uaddr;
2473 }
2474 ret = pfm_buf_fmt_init(fmt, task, ctx->ctx_smpl_hdr, ctx_flags, cpu, fmt_arg);
2475
2476error:
2477 return ret;
2478}
2479
2480static void
2481pfm_reset_pmu_state(pfm_context_t *ctx)
2482{
2483 int i;
2484
2485
2486
2487
2488 for (i=1; PMC_IS_LAST(i) == 0; i++) {
2489 if (PMC_IS_IMPL(i) == 0) continue;
2490 ctx->ctx_pmcs[i] = PMC_DFL_VAL(i);
2491 DPRINT(("pmc[%d]=0x%lx\n", i, ctx->ctx_pmcs[i]));
2492 }
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520 ctx->ctx_all_pmcs[0] = pmu_conf->impl_pmcs[0] & ~0x1;
2521
2522
2523
2524
2525 ctx->ctx_all_pmds[0] = pmu_conf->impl_pmds[0];
2526
2527 DPRINT(("<%d> all_pmcs=0x%lx all_pmds=0x%lx\n", ctx->ctx_fd, ctx->ctx_all_pmcs[0],ctx->ctx_all_pmds[0]));
2528
2529
2530
2531
2532 ctx->ctx_used_ibrs[0] = 0UL;
2533 ctx->ctx_used_dbrs[0] = 0UL;
2534}
2535
2536static int
2537pfm_ctx_getsize(void *arg, size_t *sz)
2538{
2539 pfarg_context_t *req = (pfarg_context_t *)arg;
2540 pfm_buffer_fmt_t *fmt;
2541
2542 *sz = 0;
2543
2544 if (!pfm_uuid_cmp(req->ctx_smpl_buf_id, pfm_null_uuid)) return 0;
2545
2546 fmt = pfm_find_buffer_fmt(req->ctx_smpl_buf_id);
2547 if (fmt == NULL) {
2548 DPRINT(("cannot find buffer format\n"));
2549 return -EINVAL;
2550 }
2551
2552 *sz = fmt->fmt_arg_size;
2553 DPRINT(("arg_size=%lu\n", *sz));
2554
2555 return 0;
2556}
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566static int
2567pfm_task_incompatible(pfm_context_t *ctx, struct task_struct *task)
2568{
2569
2570
2571
2572 if (task->mm == NULL) {
2573 DPRINT(("task [%d] has not memory context (kernel thread)\n", task_pid_nr(task)));
2574 return -EPERM;
2575 }
2576 if (pfm_bad_permissions(task)) {
2577 DPRINT(("no permission to attach to [%d]\n", task_pid_nr(task)));
2578 return -EPERM;
2579 }
2580
2581
2582
2583 if (CTX_OVFL_NOBLOCK(ctx) == 0 && task == current) {
2584 DPRINT(("cannot load a blocking context on self for [%d]\n", task_pid_nr(task)));
2585 return -EINVAL;
2586 }
2587
2588 if (task->exit_state == EXIT_ZOMBIE) {
2589 DPRINT(("cannot attach to zombie task [%d]\n", task_pid_nr(task)));
2590 return -EBUSY;
2591 }
2592
2593
2594
2595
2596 if (task == current) return 0;
2597
2598 if (!task_is_stopped_or_traced(task)) {
2599 DPRINT(("cannot attach to non-stopped task [%d] state=%ld\n", task_pid_nr(task), task->state));
2600 return -EBUSY;
2601 }
2602
2603
2604
2605 wait_task_inactive(task, 0);
2606
2607
2608
2609 return 0;
2610}
2611
2612static int
2613pfm_get_task(pfm_context_t *ctx, pid_t pid, struct task_struct **task)
2614{
2615 struct task_struct *p = current;
2616 int ret;
2617
2618
2619 if (pid < 2) return -EPERM;
2620
2621 if (pid != task_pid_vnr(current)) {
2622
2623 read_lock(&tasklist_lock);
2624
2625 p = find_task_by_vpid(pid);
2626
2627
2628 if (p) get_task_struct(p);
2629
2630 read_unlock(&tasklist_lock);
2631
2632 if (p == NULL) return -ESRCH;
2633 }
2634
2635 ret = pfm_task_incompatible(ctx, p);
2636 if (ret == 0) {
2637 *task = p;
2638 } else if (p != current) {
2639 pfm_put_task(p);
2640 }
2641 return ret;
2642}
2643
2644
2645
2646static int
2647pfm_context_create(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
2648{
2649 pfarg_context_t *req = (pfarg_context_t *)arg;
2650 struct file *filp;
2651 struct path path;
2652 int ctx_flags;
2653 int fd;
2654 int ret;
2655
2656
2657 ret = pfarg_is_sane(current, req);
2658 if (ret < 0)
2659 return ret;
2660
2661 ctx_flags = req->ctx_flags;
2662
2663 ret = -ENOMEM;
2664
2665 fd = get_unused_fd();
2666 if (fd < 0)
2667 return fd;
2668
2669 ctx = pfm_context_alloc(ctx_flags);
2670 if (!ctx)
2671 goto error;
2672
2673 filp = pfm_alloc_file(ctx);
2674 if (IS_ERR(filp)) {
2675 ret = PTR_ERR(filp);
2676 goto error_file;
2677 }
2678
2679 req->ctx_fd = ctx->ctx_fd = fd;
2680
2681
2682
2683
2684 if (pfm_uuid_cmp(req->ctx_smpl_buf_id, pfm_null_uuid)) {
2685 ret = pfm_setup_buffer_fmt(current, filp, ctx, ctx_flags, 0, req);
2686 if (ret)
2687 goto buffer_error;
2688 }
2689
2690 DPRINT(("ctx=%p flags=0x%x system=%d notify_block=%d excl_idle=%d no_msg=%d ctx_fd=%d\n",
2691 ctx,
2692 ctx_flags,
2693 ctx->ctx_fl_system,
2694 ctx->ctx_fl_block,
2695 ctx->ctx_fl_excl_idle,
2696 ctx->ctx_fl_no_msg,
2697 ctx->ctx_fd));
2698
2699
2700
2701
2702 pfm_reset_pmu_state(ctx);
2703
2704 fd_install(fd, filp);
2705
2706 return 0;
2707
2708buffer_error:
2709 path = filp->f_path;
2710 put_filp(filp);
2711 path_put(&path);
2712
2713 if (ctx->ctx_buf_fmt) {
2714 pfm_buf_fmt_exit(ctx->ctx_buf_fmt, current, NULL, regs);
2715 }
2716error_file:
2717 pfm_context_free(ctx);
2718
2719error:
2720 put_unused_fd(fd);
2721 return ret;
2722}
2723
2724static inline unsigned long
2725pfm_new_counter_value (pfm_counter_t *reg, int is_long_reset)
2726{
2727 unsigned long val = is_long_reset ? reg->long_reset : reg->short_reset;
2728 unsigned long new_seed, old_seed = reg->seed, mask = reg->mask;
2729 extern unsigned long carta_random32 (unsigned long seed);
2730
2731 if (reg->flags & PFM_REGFL_RANDOM) {
2732 new_seed = carta_random32(old_seed);
2733 val -= (old_seed & mask);
2734 if ((mask >> 32) != 0)
2735
2736 new_seed |= carta_random32(old_seed >> 32) << 32;
2737 reg->seed = new_seed;
2738 }
2739 reg->lval = val;
2740 return val;
2741}
2742
2743static void
2744pfm_reset_regs_masked(pfm_context_t *ctx, unsigned long *ovfl_regs, int is_long_reset)
2745{
2746 unsigned long mask = ovfl_regs[0];
2747 unsigned long reset_others = 0UL;
2748 unsigned long val;
2749 int i;
2750
2751
2752
2753
2754 mask >>= PMU_FIRST_COUNTER;
2755 for(i = PMU_FIRST_COUNTER; mask; i++, mask >>= 1) {
2756
2757 if ((mask & 0x1UL) == 0UL) continue;
2758
2759 ctx->ctx_pmds[i].val = val = pfm_new_counter_value(ctx->ctx_pmds+ i, is_long_reset);
2760 reset_others |= ctx->ctx_pmds[i].reset_pmds[0];
2761
2762 DPRINT_ovfl((" %s reset ctx_pmds[%d]=%lx\n", is_long_reset ? "long" : "short", i, val));
2763 }
2764
2765
2766
2767
2768 for(i = 0; reset_others; i++, reset_others >>= 1) {
2769
2770 if ((reset_others & 0x1) == 0) continue;
2771
2772 ctx->ctx_pmds[i].val = val = pfm_new_counter_value(ctx->ctx_pmds + i, is_long_reset);
2773
2774 DPRINT_ovfl(("%s reset_others pmd[%d]=%lx\n",
2775 is_long_reset ? "long" : "short", i, val));
2776 }
2777}
2778
2779static void
2780pfm_reset_regs(pfm_context_t *ctx, unsigned long *ovfl_regs, int is_long_reset)
2781{
2782 unsigned long mask = ovfl_regs[0];
2783 unsigned long reset_others = 0UL;
2784 unsigned long val;
2785 int i;
2786
2787 DPRINT_ovfl(("ovfl_regs=0x%lx is_long_reset=%d\n", ovfl_regs[0], is_long_reset));
2788
2789 if (ctx->ctx_state == PFM_CTX_MASKED) {
2790 pfm_reset_regs_masked(ctx, ovfl_regs, is_long_reset);
2791 return;
2792 }
2793
2794
2795
2796
2797 mask >>= PMU_FIRST_COUNTER;
2798 for(i = PMU_FIRST_COUNTER; mask; i++, mask >>= 1) {
2799
2800 if ((mask & 0x1UL) == 0UL) continue;
2801
2802 val = pfm_new_counter_value(ctx->ctx_pmds+ i, is_long_reset);
2803 reset_others |= ctx->ctx_pmds[i].reset_pmds[0];
2804
2805 DPRINT_ovfl((" %s reset ctx_pmds[%d]=%lx\n", is_long_reset ? "long" : "short", i, val));
2806
2807 pfm_write_soft_counter(ctx, i, val);
2808 }
2809
2810
2811
2812
2813 for(i = 0; reset_others; i++, reset_others >>= 1) {
2814
2815 if ((reset_others & 0x1) == 0) continue;
2816
2817 val = pfm_new_counter_value(ctx->ctx_pmds + i, is_long_reset);
2818
2819 if (PMD_IS_COUNTING(i)) {
2820 pfm_write_soft_counter(ctx, i, val);
2821 } else {
2822 ia64_set_pmd(i, val);
2823 }
2824 DPRINT_ovfl(("%s reset_others pmd[%d]=%lx\n",
2825 is_long_reset ? "long" : "short", i, val));
2826 }
2827 ia64_srlz_d();
2828}
2829
2830static int
2831pfm_write_pmcs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
2832{
2833 struct task_struct *task;
2834 pfarg_reg_t *req = (pfarg_reg_t *)arg;
2835 unsigned long value, pmc_pm;
2836 unsigned long smpl_pmds, reset_pmds, impl_pmds;
2837 unsigned int cnum, reg_flags, flags, pmc_type;
2838 int i, can_access_pmu = 0, is_loaded, is_system, expert_mode;
2839 int is_monitor, is_counting, state;
2840 int ret = -EINVAL;
2841 pfm_reg_check_t wr_func;
2842#define PFM_CHECK_PMC_PM(x, y, z) ((x)->ctx_fl_system ^ PMC_PM(y, z))
2843
2844 state = ctx->ctx_state;
2845 is_loaded = state == PFM_CTX_LOADED ? 1 : 0;
2846 is_system = ctx->ctx_fl_system;
2847 task = ctx->ctx_task;
2848 impl_pmds = pmu_conf->impl_pmds[0];
2849
2850 if (state == PFM_CTX_ZOMBIE) return -EINVAL;
2851
2852 if (is_loaded) {
2853
2854
2855
2856
2857
2858 if (is_system && ctx->ctx_cpu != smp_processor_id()) {
2859 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
2860 return -EBUSY;
2861 }
2862 can_access_pmu = GET_PMU_OWNER() == task || is_system ? 1 : 0;
2863 }
2864 expert_mode = pfm_sysctl.expert_mode;
2865
2866 for (i = 0; i < count; i++, req++) {
2867
2868 cnum = req->reg_num;
2869 reg_flags = req->reg_flags;
2870 value = req->reg_value;
2871 smpl_pmds = req->reg_smpl_pmds[0];
2872 reset_pmds = req->reg_reset_pmds[0];
2873 flags = 0;
2874
2875
2876 if (cnum >= PMU_MAX_PMCS) {
2877 DPRINT(("pmc%u is invalid\n", cnum));
2878 goto error;
2879 }
2880
2881 pmc_type = pmu_conf->pmc_desc[cnum].type;
2882 pmc_pm = (value >> pmu_conf->pmc_desc[cnum].pm_pos) & 0x1;
2883 is_counting = (pmc_type & PFM_REG_COUNTING) == PFM_REG_COUNTING ? 1 : 0;
2884 is_monitor = (pmc_type & PFM_REG_MONITOR) == PFM_REG_MONITOR ? 1 : 0;
2885
2886
2887
2888
2889
2890
2891 if ((pmc_type & PFM_REG_IMPL) == 0 || (pmc_type & PFM_REG_CONTROL) == PFM_REG_CONTROL) {
2892 DPRINT(("pmc%u is unimplemented or no-access pmc_type=%x\n", cnum, pmc_type));
2893 goto error;
2894 }
2895 wr_func = pmu_conf->pmc_desc[cnum].write_check;
2896
2897
2898
2899
2900
2901 if (is_monitor && value != PMC_DFL_VAL(cnum) && is_system ^ pmc_pm) {
2902 DPRINT(("pmc%u pmc_pm=%lu is_system=%d\n",
2903 cnum,
2904 pmc_pm,
2905 is_system));
2906 goto error;
2907 }
2908
2909 if (is_counting) {
2910
2911
2912
2913
2914 value |= 1 << PMU_PMC_OI;
2915
2916 if (reg_flags & PFM_REGFL_OVFL_NOTIFY) {
2917 flags |= PFM_REGFL_OVFL_NOTIFY;
2918 }
2919
2920 if (reg_flags & PFM_REGFL_RANDOM) flags |= PFM_REGFL_RANDOM;
2921
2922
2923 if ((smpl_pmds & impl_pmds) != smpl_pmds) {
2924 DPRINT(("invalid smpl_pmds 0x%lx for pmc%u\n", smpl_pmds, cnum));
2925 goto error;
2926 }
2927
2928
2929 if ((reset_pmds & impl_pmds) != reset_pmds) {
2930 DPRINT(("invalid reset_pmds 0x%lx for pmc%u\n", reset_pmds, cnum));
2931 goto error;
2932 }
2933 } else {
2934 if (reg_flags & (PFM_REGFL_OVFL_NOTIFY|PFM_REGFL_RANDOM)) {
2935 DPRINT(("cannot set ovfl_notify or random on pmc%u\n", cnum));
2936 goto error;
2937 }
2938
2939 }
2940
2941
2942
2943
2944 if (likely(expert_mode == 0 && wr_func)) {
2945 ret = (*wr_func)(task, ctx, cnum, &value, regs);
2946 if (ret) goto error;
2947 ret = -EINVAL;
2948 }
2949
2950
2951
2952
2953 PFM_REG_RETFLAG_SET(req->reg_flags, 0);
2954
2955
2956
2957
2958
2959
2960
2961
2962 if (is_counting) {
2963
2964
2965
2966 ctx->ctx_pmds[cnum].flags = flags;
2967
2968 ctx->ctx_pmds[cnum].reset_pmds[0] = reset_pmds;
2969 ctx->ctx_pmds[cnum].smpl_pmds[0] = smpl_pmds;
2970 ctx->ctx_pmds[cnum].eventid = req->reg_smpl_eventid;
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983 CTX_USED_PMD(ctx, reset_pmds);
2984 CTX_USED_PMD(ctx, smpl_pmds);
2985
2986
2987
2988
2989 if (state == PFM_CTX_MASKED) ctx->ctx_ovfl_regs[0] &= ~1UL << cnum;
2990 }
2991
2992
2993
2994
2995
2996 CTX_USED_PMD(ctx, pmu_conf->pmc_desc[cnum].dep_pmd[0]);
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010 if (is_monitor) CTX_USED_MONITOR(ctx, 1UL << cnum);
3011
3012
3013
3014
3015 ctx->ctx_pmcs[cnum] = value;
3016
3017 if (is_loaded) {
3018
3019
3020
3021 if (is_system == 0) ctx->th_pmcs[cnum] = value;
3022
3023
3024
3025
3026 if (can_access_pmu) {
3027 ia64_set_pmc(cnum, value);
3028 }
3029#ifdef CONFIG_SMP
3030 else {
3031
3032
3033
3034
3035
3036
3037
3038 ctx->ctx_reload_pmcs[0] |= 1UL << cnum;
3039 }
3040#endif
3041 }
3042
3043 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",
3044 cnum,
3045 value,
3046 is_loaded,
3047 can_access_pmu,
3048 flags,
3049 ctx->ctx_all_pmcs[0],
3050 ctx->ctx_used_pmds[0],
3051 ctx->ctx_pmds[cnum].eventid,
3052 smpl_pmds,
3053 reset_pmds,
3054 ctx->ctx_reload_pmcs[0],
3055 ctx->ctx_used_monitors[0],
3056 ctx->ctx_ovfl_regs[0]));
3057 }
3058
3059
3060
3061
3062 if (can_access_pmu) ia64_srlz_d();
3063
3064 return 0;
3065error:
3066 PFM_REG_RETFLAG_SET(req->reg_flags, PFM_REG_RETFL_EINVAL);
3067 return ret;
3068}
3069
3070static int
3071pfm_write_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3072{
3073 struct task_struct *task;
3074 pfarg_reg_t *req = (pfarg_reg_t *)arg;
3075 unsigned long value, hw_value, ovfl_mask;
3076 unsigned int cnum;
3077 int i, can_access_pmu = 0, state;
3078 int is_counting, is_loaded, is_system, expert_mode;
3079 int ret = -EINVAL;
3080 pfm_reg_check_t wr_func;
3081
3082
3083 state = ctx->ctx_state;
3084 is_loaded = state == PFM_CTX_LOADED ? 1 : 0;
3085 is_system = ctx->ctx_fl_system;
3086 ovfl_mask = pmu_conf->ovfl_val;
3087 task = ctx->ctx_task;
3088
3089 if (unlikely(state == PFM_CTX_ZOMBIE)) return -EINVAL;
3090
3091
3092
3093
3094
3095 if (likely(is_loaded)) {
3096
3097
3098
3099
3100
3101 if (unlikely(is_system && ctx->ctx_cpu != smp_processor_id())) {
3102 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
3103 return -EBUSY;
3104 }
3105 can_access_pmu = GET_PMU_OWNER() == task || is_system ? 1 : 0;
3106 }
3107 expert_mode = pfm_sysctl.expert_mode;
3108
3109 for (i = 0; i < count; i++, req++) {
3110
3111 cnum = req->reg_num;
3112 value = req->reg_value;
3113
3114 if (!PMD_IS_IMPL(cnum)) {
3115 DPRINT(("pmd[%u] is unimplemented or invalid\n", cnum));
3116 goto abort_mission;
3117 }
3118 is_counting = PMD_IS_COUNTING(cnum);
3119 wr_func = pmu_conf->pmd_desc[cnum].write_check;
3120
3121
3122
3123
3124 if (unlikely(expert_mode == 0 && wr_func)) {
3125 unsigned long v = value;
3126
3127 ret = (*wr_func)(task, ctx, cnum, &v, regs);
3128 if (ret) goto abort_mission;
3129
3130 value = v;
3131 ret = -EINVAL;
3132 }
3133
3134
3135
3136
3137 PFM_REG_RETFLAG_SET(req->reg_flags, 0);
3138
3139
3140
3141
3142 hw_value = value;
3143
3144
3145
3146
3147 if (is_counting) {
3148
3149
3150
3151 ctx->ctx_pmds[cnum].lval = value;
3152
3153
3154
3155
3156 if (is_loaded) {
3157 hw_value = value & ovfl_mask;
3158 value = value & ~ovfl_mask;
3159 }
3160 }
3161
3162
3163
3164 ctx->ctx_pmds[cnum].long_reset = req->reg_long_reset;
3165 ctx->ctx_pmds[cnum].short_reset = req->reg_short_reset;
3166
3167
3168
3169
3170 ctx->ctx_pmds[cnum].seed = req->reg_random_seed;
3171 ctx->ctx_pmds[cnum].mask = req->reg_random_mask;
3172
3173
3174
3175
3176 ctx->ctx_pmds[cnum].val = value;
3177
3178
3179
3180
3181
3182
3183
3184 CTX_USED_PMD(ctx, PMD_PMD_DEP(cnum));
3185
3186
3187
3188
3189 CTX_USED_PMD(ctx, RDEP(cnum));
3190
3191
3192
3193
3194
3195 if (is_counting && state == PFM_CTX_MASKED) {
3196 ctx->ctx_ovfl_regs[0] &= ~1UL << cnum;
3197 }
3198
3199 if (is_loaded) {
3200
3201
3202
3203 if (is_system == 0) ctx->th_pmds[cnum] = hw_value;
3204
3205
3206
3207
3208 if (can_access_pmu) {
3209 ia64_set_pmd(cnum, hw_value);
3210 } else {
3211#ifdef CONFIG_SMP
3212
3213
3214
3215
3216
3217 ctx->ctx_reload_pmds[0] |= 1UL << cnum;
3218#endif
3219 }
3220 }
3221
3222 DPRINT(("pmd[%u]=0x%lx ld=%d apmu=%d, hw_value=0x%lx ctx_pmd=0x%lx short_reset=0x%lx "
3223 "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",
3224 cnum,
3225 value,
3226 is_loaded,
3227 can_access_pmu,
3228 hw_value,
3229 ctx->ctx_pmds[cnum].val,
3230 ctx->ctx_pmds[cnum].short_reset,
3231 ctx->ctx_pmds[cnum].long_reset,
3232 PMC_OVFL_NOTIFY(ctx, cnum) ? 'Y':'N',
3233 ctx->ctx_pmds[cnum].seed,
3234 ctx->ctx_pmds[cnum].mask,
3235 ctx->ctx_used_pmds[0],
3236 ctx->ctx_pmds[cnum].reset_pmds[0],
3237 ctx->ctx_reload_pmds[0],
3238 ctx->ctx_all_pmds[0],
3239 ctx->ctx_ovfl_regs[0]));
3240 }
3241
3242
3243
3244
3245 if (can_access_pmu) ia64_srlz_d();
3246
3247 return 0;
3248
3249abort_mission:
3250
3251
3252
3253 PFM_REG_RETFLAG_SET(req->reg_flags, PFM_REG_RETFL_EINVAL);
3254 return ret;
3255}
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266static int
3267pfm_read_pmds(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3268{
3269 struct task_struct *task;
3270 unsigned long val = 0UL, lval, ovfl_mask, sval;
3271 pfarg_reg_t *req = (pfarg_reg_t *)arg;
3272 unsigned int cnum, reg_flags = 0;
3273 int i, can_access_pmu = 0, state;
3274 int is_loaded, is_system, is_counting, expert_mode;
3275 int ret = -EINVAL;
3276 pfm_reg_check_t rd_func;
3277
3278
3279
3280
3281
3282
3283 state = ctx->ctx_state;
3284 is_loaded = state == PFM_CTX_LOADED ? 1 : 0;
3285 is_system = ctx->ctx_fl_system;
3286 ovfl_mask = pmu_conf->ovfl_val;
3287 task = ctx->ctx_task;
3288
3289 if (state == PFM_CTX_ZOMBIE) return -EINVAL;
3290
3291 if (likely(is_loaded)) {
3292
3293
3294
3295
3296
3297 if (unlikely(is_system && ctx->ctx_cpu != smp_processor_id())) {
3298 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
3299 return -EBUSY;
3300 }
3301
3302
3303
3304 can_access_pmu = GET_PMU_OWNER() == task || is_system ? 1 : 0;
3305
3306 if (can_access_pmu) ia64_srlz_d();
3307 }
3308 expert_mode = pfm_sysctl.expert_mode;
3309
3310 DPRINT(("ld=%d apmu=%d ctx_state=%d\n",
3311 is_loaded,
3312 can_access_pmu,
3313 state));
3314
3315
3316
3317
3318
3319
3320 for (i = 0; i < count; i++, req++) {
3321
3322 cnum = req->reg_num;
3323 reg_flags = req->reg_flags;
3324
3325 if (unlikely(!PMD_IS_IMPL(cnum))) goto error;
3326
3327
3328
3329
3330
3331
3332
3333
3334 if (unlikely(!CTX_IS_USED_PMD(ctx, cnum))) goto error;
3335
3336 sval = ctx->ctx_pmds[cnum].val;
3337 lval = ctx->ctx_pmds[cnum].lval;
3338 is_counting = PMD_IS_COUNTING(cnum);
3339
3340
3341
3342
3343
3344
3345 if (can_access_pmu){
3346 val = ia64_get_pmd(cnum);
3347 } else {
3348
3349
3350
3351
3352
3353 val = is_loaded ? ctx->th_pmds[cnum] : 0UL;
3354 }
3355 rd_func = pmu_conf->pmd_desc[cnum].read_check;
3356
3357 if (is_counting) {
3358
3359
3360
3361 val &= ovfl_mask;
3362 val += sval;
3363 }
3364
3365
3366
3367
3368 if (unlikely(expert_mode == 0 && rd_func)) {
3369 unsigned long v = val;
3370 ret = (*rd_func)(ctx->ctx_task, ctx, cnum, &v, regs);
3371 if (ret) goto error;
3372 val = v;
3373 ret = -EINVAL;
3374 }
3375
3376 PFM_REG_RETFLAG_SET(reg_flags, 0);
3377
3378 DPRINT(("pmd[%u]=0x%lx\n", cnum, val));
3379
3380
3381
3382
3383
3384
3385 req->reg_value = val;
3386 req->reg_flags = reg_flags;
3387 req->reg_last_reset_val = lval;
3388 }
3389
3390 return 0;
3391
3392error:
3393 PFM_REG_RETFLAG_SET(req->reg_flags, PFM_REG_RETFL_EINVAL);
3394 return ret;
3395}
3396
3397int
3398pfm_mod_write_pmcs(struct task_struct *task, void *req, unsigned int nreq, struct pt_regs *regs)
3399{
3400 pfm_context_t *ctx;
3401
3402 if (req == NULL) return -EINVAL;
3403
3404 ctx = GET_PMU_CTX();
3405
3406 if (ctx == NULL) return -EINVAL;
3407
3408
3409
3410
3411
3412 if (task != current && ctx->ctx_fl_system == 0) return -EBUSY;
3413
3414 return pfm_write_pmcs(ctx, req, nreq, regs);
3415}
3416EXPORT_SYMBOL(pfm_mod_write_pmcs);
3417
3418int
3419pfm_mod_read_pmds(struct task_struct *task, void *req, unsigned int nreq, struct pt_regs *regs)
3420{
3421 pfm_context_t *ctx;
3422
3423 if (req == NULL) return -EINVAL;
3424
3425 ctx = GET_PMU_CTX();
3426
3427 if (ctx == NULL) return -EINVAL;
3428
3429
3430
3431
3432
3433 if (task != current && ctx->ctx_fl_system == 0) return -EBUSY;
3434
3435 return pfm_read_pmds(ctx, req, nreq, regs);
3436}
3437EXPORT_SYMBOL(pfm_mod_read_pmds);
3438
3439
3440
3441
3442
3443int
3444pfm_use_debug_registers(struct task_struct *task)
3445{
3446 pfm_context_t *ctx = task->thread.pfm_context;
3447 unsigned long flags;
3448 int ret = 0;
3449
3450 if (pmu_conf->use_rr_dbregs == 0) return 0;
3451
3452 DPRINT(("called for [%d]\n", task_pid_nr(task)));
3453
3454
3455
3456
3457 if (task->thread.flags & IA64_THREAD_DBG_VALID) return 0;
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467 if (ctx && ctx->ctx_fl_using_dbreg == 1) return -1;
3468
3469 LOCK_PFS(flags);
3470
3471
3472
3473
3474
3475 if (pfm_sessions.pfs_sys_use_dbregs> 0)
3476 ret = -1;
3477 else
3478 pfm_sessions.pfs_ptrace_use_dbregs++;
3479
3480 DPRINT(("ptrace_use_dbregs=%u sys_use_dbregs=%u by [%d] ret = %d\n",
3481 pfm_sessions.pfs_ptrace_use_dbregs,
3482 pfm_sessions.pfs_sys_use_dbregs,
3483 task_pid_nr(task), ret));
3484
3485 UNLOCK_PFS(flags);
3486
3487 return ret;
3488}
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498int
3499pfm_release_debug_registers(struct task_struct *task)
3500{
3501 unsigned long flags;
3502 int ret;
3503
3504 if (pmu_conf->use_rr_dbregs == 0) return 0;
3505
3506 LOCK_PFS(flags);
3507 if (pfm_sessions.pfs_ptrace_use_dbregs == 0) {
3508 printk(KERN_ERR "perfmon: invalid release for [%d] ptrace_use_dbregs=0\n", task_pid_nr(task));
3509 ret = -1;
3510 } else {
3511 pfm_sessions.pfs_ptrace_use_dbregs--;
3512 ret = 0;
3513 }
3514 UNLOCK_PFS(flags);
3515
3516 return ret;
3517}
3518
3519static int
3520pfm_restart(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3521{
3522 struct task_struct *task;
3523 pfm_buffer_fmt_t *fmt;
3524 pfm_ovfl_ctrl_t rst_ctrl;
3525 int state, is_system;
3526 int ret = 0;
3527
3528 state = ctx->ctx_state;
3529 fmt = ctx->ctx_buf_fmt;
3530 is_system = ctx->ctx_fl_system;
3531 task = PFM_CTX_TASK(ctx);
3532
3533 switch(state) {
3534 case PFM_CTX_MASKED:
3535 break;
3536 case PFM_CTX_LOADED:
3537 if (CTX_HAS_SMPL(ctx) && fmt->fmt_restart_active) break;
3538
3539 case PFM_CTX_UNLOADED:
3540 case PFM_CTX_ZOMBIE:
3541 DPRINT(("invalid state=%d\n", state));
3542 return -EBUSY;
3543 default:
3544 DPRINT(("state=%d, cannot operate (no active_restart handler)\n", state));
3545 return -EINVAL;
3546 }
3547
3548
3549
3550
3551
3552
3553 if (is_system && ctx->ctx_cpu != smp_processor_id()) {
3554 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
3555 return -EBUSY;
3556 }
3557
3558
3559 if (unlikely(task == NULL)) {
3560 printk(KERN_ERR "perfmon: [%d] pfm_restart no task\n", task_pid_nr(current));
3561 return -EINVAL;
3562 }
3563
3564 if (task == current || is_system) {
3565
3566 fmt = ctx->ctx_buf_fmt;
3567
3568 DPRINT(("restarting self %d ovfl=0x%lx\n",
3569 task_pid_nr(task),
3570 ctx->ctx_ovfl_regs[0]));
3571
3572 if (CTX_HAS_SMPL(ctx)) {
3573
3574 prefetch(ctx->ctx_smpl_hdr);
3575
3576 rst_ctrl.bits.mask_monitoring = 0;
3577 rst_ctrl.bits.reset_ovfl_pmds = 0;
3578
3579 if (state == PFM_CTX_LOADED)
3580 ret = pfm_buf_fmt_restart_active(fmt, task, &rst_ctrl, ctx->ctx_smpl_hdr, regs);
3581 else
3582 ret = pfm_buf_fmt_restart(fmt, task, &rst_ctrl, ctx->ctx_smpl_hdr, regs);
3583 } else {
3584 rst_ctrl.bits.mask_monitoring = 0;
3585 rst_ctrl.bits.reset_ovfl_pmds = 1;
3586 }
3587
3588 if (ret == 0) {
3589 if (rst_ctrl.bits.reset_ovfl_pmds)
3590 pfm_reset_regs(ctx, ctx->ctx_ovfl_regs, PFM_PMD_LONG_RESET);
3591
3592 if (rst_ctrl.bits.mask_monitoring == 0) {
3593 DPRINT(("resuming monitoring for [%d]\n", task_pid_nr(task)));
3594
3595 if (state == PFM_CTX_MASKED) pfm_restore_monitoring(task);
3596 } else {
3597 DPRINT(("keeping monitoring stopped for [%d]\n", task_pid_nr(task)));
3598
3599
3600 }
3601 }
3602
3603
3604
3605 ctx->ctx_ovfl_regs[0] = 0UL;
3606
3607
3608
3609
3610 ctx->ctx_state = PFM_CTX_LOADED;
3611
3612
3613
3614
3615 ctx->ctx_fl_can_restart = 0;
3616
3617 return 0;
3618 }
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628 if (state == PFM_CTX_MASKED) {
3629 if (ctx->ctx_fl_can_restart == 0) return -EINVAL;
3630
3631
3632
3633
3634 ctx->ctx_fl_can_restart = 0;
3635 }
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653 if (CTX_OVFL_NOBLOCK(ctx) == 0 && state == PFM_CTX_MASKED) {
3654 DPRINT(("unblocking [%d]\n", task_pid_nr(task)));
3655 complete(&ctx->ctx_restart_done);
3656 } else {
3657 DPRINT(("[%d] armed exit trap\n", task_pid_nr(task)));
3658
3659 ctx->ctx_fl_trap_reason = PFM_TRAP_REASON_RESET;
3660
3661 PFM_SET_WORK_PENDING(task, 1);
3662
3663 set_notify_resume(task);
3664
3665
3666
3667
3668 }
3669 return 0;
3670}
3671
3672static int
3673pfm_debug(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3674{
3675 unsigned int m = *(unsigned int *)arg;
3676
3677 pfm_sysctl.debug = m == 0 ? 0 : 1;
3678
3679 printk(KERN_INFO "perfmon debugging %s (timing reset)\n", pfm_sysctl.debug ? "on" : "off");
3680
3681 if (m == 0) {
3682 memset(pfm_stats, 0, sizeof(pfm_stats));
3683 for(m=0; m < NR_CPUS; m++) pfm_stats[m].pfm_ovfl_intr_cycles_min = ~0UL;
3684 }
3685 return 0;
3686}
3687
3688
3689
3690
3691static int
3692pfm_write_ibr_dbr(int mode, pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3693{
3694 struct thread_struct *thread = NULL;
3695 struct task_struct *task;
3696 pfarg_dbreg_t *req = (pfarg_dbreg_t *)arg;
3697 unsigned long flags;
3698 dbreg_t dbreg;
3699 unsigned int rnum;
3700 int first_time;
3701 int ret = 0, state;
3702 int i, can_access_pmu = 0;
3703 int is_system, is_loaded;
3704
3705 if (pmu_conf->use_rr_dbregs == 0) return -EINVAL;
3706
3707 state = ctx->ctx_state;
3708 is_loaded = state == PFM_CTX_LOADED ? 1 : 0;
3709 is_system = ctx->ctx_fl_system;
3710 task = ctx->ctx_task;
3711
3712 if (state == PFM_CTX_ZOMBIE) return -EINVAL;
3713
3714
3715
3716
3717
3718 if (is_loaded) {
3719 thread = &task->thread;
3720
3721
3722
3723
3724
3725 if (unlikely(is_system && ctx->ctx_cpu != smp_processor_id())) {
3726 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
3727 return -EBUSY;
3728 }
3729 can_access_pmu = GET_PMU_OWNER() == task || is_system ? 1 : 0;
3730 }
3731
3732
3733
3734
3735
3736
3737
3738
3739 first_time = ctx->ctx_fl_using_dbreg == 0;
3740
3741
3742
3743
3744 if (is_loaded && (thread->flags & IA64_THREAD_DBG_VALID) != 0) {
3745 DPRINT(("debug registers already in use for [%d]\n", task_pid_nr(task)));
3746 return -EBUSY;
3747 }
3748
3749
3750
3751
3752
3753
3754
3755
3756 if (is_loaded) {
3757 LOCK_PFS(flags);
3758
3759 if (first_time && is_system) {
3760 if (pfm_sessions.pfs_ptrace_use_dbregs)
3761 ret = -EBUSY;
3762 else
3763 pfm_sessions.pfs_sys_use_dbregs++;
3764 }
3765 UNLOCK_PFS(flags);
3766 }
3767
3768 if (ret != 0) return ret;
3769
3770
3771
3772
3773
3774 ctx->ctx_fl_using_dbreg = 1;
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785 if (first_time && can_access_pmu) {
3786 DPRINT(("[%d] clearing ibrs, dbrs\n", task_pid_nr(task)));
3787 for (i=0; i < pmu_conf->num_ibrs; i++) {
3788 ia64_set_ibr(i, 0UL);
3789 ia64_dv_serialize_instruction();
3790 }
3791 ia64_srlz_i();
3792 for (i=0; i < pmu_conf->num_dbrs; i++) {
3793 ia64_set_dbr(i, 0UL);
3794 ia64_dv_serialize_data();
3795 }
3796 ia64_srlz_d();
3797 }
3798
3799
3800
3801
3802 for (i = 0; i < count; i++, req++) {
3803
3804 rnum = req->dbreg_num;
3805 dbreg.val = req->dbreg_value;
3806
3807 ret = -EINVAL;
3808
3809 if ((mode == PFM_CODE_RR && rnum >= PFM_NUM_IBRS) || ((mode == PFM_DATA_RR) && rnum >= PFM_NUM_DBRS)) {
3810 DPRINT(("invalid register %u val=0x%lx mode=%d i=%d count=%d\n",
3811 rnum, dbreg.val, mode, i, count));
3812
3813 goto abort_mission;
3814 }
3815
3816
3817
3818
3819 if (rnum & 0x1) {
3820 if (mode == PFM_CODE_RR)
3821 dbreg.ibr.ibr_x = 0;
3822 else
3823 dbreg.dbr.dbr_r = dbreg.dbr.dbr_w = 0;
3824 }
3825
3826 PFM_REG_RETFLAG_SET(req->dbreg_flags, 0);
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838 if (mode == PFM_CODE_RR) {
3839 CTX_USED_IBR(ctx, rnum);
3840
3841 if (can_access_pmu) {
3842 ia64_set_ibr(rnum, dbreg.val);
3843 ia64_dv_serialize_instruction();
3844 }
3845
3846 ctx->ctx_ibrs[rnum] = dbreg.val;
3847
3848 DPRINT(("write ibr%u=0x%lx used_ibrs=0x%x ld=%d apmu=%d\n",
3849 rnum, dbreg.val, ctx->ctx_used_ibrs[0], is_loaded, can_access_pmu));
3850 } else {
3851 CTX_USED_DBR(ctx, rnum);
3852
3853 if (can_access_pmu) {
3854 ia64_set_dbr(rnum, dbreg.val);
3855 ia64_dv_serialize_data();
3856 }
3857 ctx->ctx_dbrs[rnum] = dbreg.val;
3858
3859 DPRINT(("write dbr%u=0x%lx used_dbrs=0x%x ld=%d apmu=%d\n",
3860 rnum, dbreg.val, ctx->ctx_used_dbrs[0], is_loaded, can_access_pmu));
3861 }
3862 }
3863
3864 return 0;
3865
3866abort_mission:
3867
3868
3869
3870 if (first_time) {
3871 LOCK_PFS(flags);
3872 if (ctx->ctx_fl_system) {
3873 pfm_sessions.pfs_sys_use_dbregs--;
3874 }
3875 UNLOCK_PFS(flags);
3876 ctx->ctx_fl_using_dbreg = 0;
3877 }
3878
3879
3880
3881 PFM_REG_RETFLAG_SET(req->dbreg_flags, PFM_REG_RETFL_EINVAL);
3882
3883 return ret;
3884}
3885
3886static int
3887pfm_write_ibrs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3888{
3889 return pfm_write_ibr_dbr(PFM_CODE_RR, ctx, arg, count, regs);
3890}
3891
3892static int
3893pfm_write_dbrs(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3894{
3895 return pfm_write_ibr_dbr(PFM_DATA_RR, ctx, arg, count, regs);
3896}
3897
3898int
3899pfm_mod_write_ibrs(struct task_struct *task, void *req, unsigned int nreq, struct pt_regs *regs)
3900{
3901 pfm_context_t *ctx;
3902
3903 if (req == NULL) return -EINVAL;
3904
3905 ctx = GET_PMU_CTX();
3906
3907 if (ctx == NULL) return -EINVAL;
3908
3909
3910
3911
3912
3913 if (task != current && ctx->ctx_fl_system == 0) return -EBUSY;
3914
3915 return pfm_write_ibrs(ctx, req, nreq, regs);
3916}
3917EXPORT_SYMBOL(pfm_mod_write_ibrs);
3918
3919int
3920pfm_mod_write_dbrs(struct task_struct *task, void *req, unsigned int nreq, struct pt_regs *regs)
3921{
3922 pfm_context_t *ctx;
3923
3924 if (req == NULL) return -EINVAL;
3925
3926 ctx = GET_PMU_CTX();
3927
3928 if (ctx == NULL) return -EINVAL;
3929
3930
3931
3932
3933
3934 if (task != current && ctx->ctx_fl_system == 0) return -EBUSY;
3935
3936 return pfm_write_dbrs(ctx, req, nreq, regs);
3937}
3938EXPORT_SYMBOL(pfm_mod_write_dbrs);
3939
3940
3941static int
3942pfm_get_features(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3943{
3944 pfarg_features_t *req = (pfarg_features_t *)arg;
3945
3946 req->ft_version = PFM_VERSION;
3947 return 0;
3948}
3949
3950static int
3951pfm_stop(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
3952{
3953 struct pt_regs *tregs;
3954 struct task_struct *task = PFM_CTX_TASK(ctx);
3955 int state, is_system;
3956
3957 state = ctx->ctx_state;
3958 is_system = ctx->ctx_fl_system;
3959
3960
3961
3962
3963 if (state == PFM_CTX_UNLOADED) return -EINVAL;
3964
3965
3966
3967
3968
3969
3970 if (is_system && ctx->ctx_cpu != smp_processor_id()) {
3971 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
3972 return -EBUSY;
3973 }
3974 DPRINT(("task [%d] ctx_state=%d is_system=%d\n",
3975 task_pid_nr(PFM_CTX_TASK(ctx)),
3976 state,
3977 is_system));
3978
3979
3980
3981
3982
3983 if (is_system) {
3984
3985
3986
3987
3988
3989 ia64_setreg(_IA64_REG_CR_DCR, ia64_getreg(_IA64_REG_CR_DCR) & ~IA64_DCR_PP);
3990 ia64_srlz_i();
3991
3992
3993
3994
3995 PFM_CPUINFO_CLEAR(PFM_CPUINFO_DCR_PP);
3996
3997
3998
3999
4000 pfm_clear_psr_pp();
4001
4002
4003
4004
4005 ia64_psr(regs)->pp = 0;
4006
4007 return 0;
4008 }
4009
4010
4011
4012
4013 if (task == current) {
4014
4015 pfm_clear_psr_up();
4016
4017
4018
4019
4020 ia64_psr(regs)->up = 0;
4021 } else {
4022 tregs = task_pt_regs(task);
4023
4024
4025
4026
4027 ia64_psr(tregs)->up = 0;
4028
4029
4030
4031
4032 ctx->ctx_saved_psr_up = 0;
4033 DPRINT(("task=[%d]\n", task_pid_nr(task)));
4034 }
4035 return 0;
4036}
4037
4038
4039static int
4040pfm_start(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
4041{
4042 struct pt_regs *tregs;
4043 int state, is_system;
4044
4045 state = ctx->ctx_state;
4046 is_system = ctx->ctx_fl_system;
4047
4048 if (state != PFM_CTX_LOADED) return -EINVAL;
4049
4050
4051
4052
4053
4054
4055 if (is_system && ctx->ctx_cpu != smp_processor_id()) {
4056 DPRINT(("should be running on CPU%d\n", ctx->ctx_cpu));
4057 return -EBUSY;
4058 }
4059
4060
4061
4062
4063
4064
4065 if (is_system) {
4066
4067
4068
4069
4070 ia64_psr(regs)->pp = 1;
4071
4072
4073
4074
4075 PFM_CPUINFO_SET(PFM_CPUINFO_DCR_PP);
4076
4077
4078
4079
4080 pfm_set_psr_pp();
4081
4082
4083 ia64_setreg(_IA64_REG_CR_DCR, ia64_getreg(_IA64_REG_CR_DCR) | IA64_DCR_PP);
4084 ia64_srlz_i();
4085
4086 return 0;
4087 }
4088
4089
4090
4091
4092
4093 if (ctx->ctx_task == current) {
4094
4095
4096 pfm_set_psr_up();
4097
4098
4099
4100
4101 ia64_psr(regs)->up = 1;
4102
4103 } else {
4104 tregs = task_pt_regs(ctx->ctx_task);
4105
4106
4107
4108
4109
4110 ctx->ctx_saved_psr_up = IA64_PSR_UP;
4111
4112
4113
4114
4115 ia64_psr(tregs)->up = 1;
4116 }
4117 return 0;
4118}
4119
4120static int
4121pfm_get_pmc_reset(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
4122{
4123 pfarg_reg_t *req = (pfarg_reg_t *)arg;
4124 unsigned int cnum;
4125 int i;
4126 int ret = -EINVAL;
4127
4128 for (i = 0; i < count; i++, req++) {
4129
4130 cnum = req->reg_num;
4131
4132 if (!PMC_IS_IMPL(cnum)) goto abort_mission;
4133
4134 req->reg_value = PMC_DFL_VAL(cnum);
4135
4136 PFM_REG_RETFLAG_SET(req->reg_flags, 0);
4137
4138 DPRINT(("pmc_reset_val pmc[%u]=0x%lx\n", cnum, req->reg_value));
4139 }
4140 return 0;
4141
4142abort_mission:
4143 PFM_REG_RETFLAG_SET(req->reg_flags, PFM_REG_RETFL_EINVAL);
4144 return ret;
4145}
4146
4147static int
4148pfm_check_task_exist(pfm_context_t *ctx)
4149{
4150 struct task_struct *g, *t;
4151 int ret = -ESRCH;
4152
4153 read_lock(&tasklist_lock);
4154
4155 do_each_thread (g, t) {
4156 if (t->thread.pfm_context == ctx) {
4157 ret = 0;
4158 goto out;
4159 }
4160 } while_each_thread (g, t);
4161out:
4162 read_unlock(&tasklist_lock);
4163
4164 DPRINT(("pfm_check_task_exist: ret=%d ctx=%p\n", ret, ctx));
4165
4166 return ret;
4167}
4168
4169static int
4170pfm_context_load(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
4171{
4172 struct task_struct *task;
4173 struct thread_struct *thread;
4174 struct pfm_context_t *old;
4175 unsigned long flags;
4176#ifndef CONFIG_SMP
4177 struct task_struct *owner_task = NULL;
4178#endif
4179 pfarg_load_t *req = (pfarg_load_t *)arg;
4180 unsigned long *pmcs_source, *pmds_source;
4181 int the_cpu;
4182 int ret = 0;
4183 int state, is_system, set_dbregs = 0;
4184
4185 state = ctx->ctx_state;
4186 is_system = ctx->ctx_fl_system;
4187
4188
4189
4190 if (state != PFM_CTX_UNLOADED) {
4191 DPRINT(("cannot load to [%d], invalid ctx_state=%d\n",
4192 req->load_pid,
4193 ctx->ctx_state));
4194 return -EBUSY;
4195 }
4196
4197 DPRINT(("load_pid [%d] using_dbreg=%d\n", req->load_pid, ctx->ctx_fl_using_dbreg));
4198
4199 if (CTX_OVFL_NOBLOCK(ctx) == 0 && req->load_pid == current->pid) {
4200 DPRINT(("cannot use blocking mode on self\n"));
4201 return -EINVAL;
4202 }
4203
4204 ret = pfm_get_task(ctx, req->load_pid, &task);
4205 if (ret) {
4206 DPRINT(("load_pid [%d] get_task=%d\n", req->load_pid, ret));
4207 return ret;
4208 }
4209
4210 ret = -EINVAL;
4211
4212
4213
4214
4215 if (is_system && task != current) {
4216 DPRINT(("system wide is self monitoring only load_pid=%d\n",
4217 req->load_pid));
4218 goto error;
4219 }
4220
4221 thread = &task->thread;
4222
4223 ret = 0;
4224
4225
4226
4227
4228 if (ctx->ctx_fl_using_dbreg) {
4229 if (thread->flags & IA64_THREAD_DBG_VALID) {
4230 ret = -EBUSY;
4231 DPRINT(("load_pid [%d] task is debugged, cannot load range restrictions\n", req->load_pid));
4232 goto error;
4233 }
4234 LOCK_PFS(flags);
4235
4236 if (is_system) {
4237 if (pfm_sessions.pfs_ptrace_use_dbregs) {
4238 DPRINT(("cannot load [%d] dbregs in use\n",
4239 task_pid_nr(task)));
4240 ret = -EBUSY;
4241 } else {
4242 pfm_sessions.pfs_sys_use_dbregs++;
4243 DPRINT(("load [%d] increased sys_use_dbreg=%u\n", task_pid_nr(task), pfm_sessions.pfs_sys_use_dbregs));
4244 set_dbregs = 1;
4245 }
4246 }
4247
4248 UNLOCK_PFS(flags);
4249
4250 if (ret) goto error;
4251 }
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268 the_cpu = ctx->ctx_cpu = smp_processor_id();
4269
4270 ret = -EBUSY;
4271
4272
4273
4274 ret = pfm_reserve_session(current, is_system, the_cpu);
4275 if (ret) goto error;
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286 DPRINT(("before cmpxchg() old_ctx=%p new_ctx=%p\n",
4287 thread->pfm_context, ctx));
4288
4289 ret = -EBUSY;
4290 old = ia64_cmpxchg(acq, &thread->pfm_context, NULL, ctx, sizeof(pfm_context_t *));
4291 if (old != NULL) {
4292 DPRINT(("load_pid [%d] already has a context\n", req->load_pid));
4293 goto error_unres;
4294 }
4295
4296 pfm_reset_msgq(ctx);
4297
4298 ctx->ctx_state = PFM_CTX_LOADED;
4299
4300
4301
4302
4303 ctx->ctx_task = task;
4304
4305 if (is_system) {
4306
4307
4308
4309 PFM_CPUINFO_SET(PFM_CPUINFO_SYST_WIDE);
4310 PFM_CPUINFO_CLEAR(PFM_CPUINFO_DCR_PP);
4311
4312 if (ctx->ctx_fl_excl_idle) PFM_CPUINFO_SET(PFM_CPUINFO_EXCL_IDLE);
4313 } else {
4314 thread->flags |= IA64_THREAD_PM_VALID;
4315 }
4316
4317
4318
4319
4320 pfm_copy_pmds(task, ctx);
4321 pfm_copy_pmcs(task, ctx);
4322
4323 pmcs_source = ctx->th_pmcs;
4324 pmds_source = ctx->th_pmds;
4325
4326
4327
4328
4329 if (task == current) {
4330
4331 if (is_system == 0) {
4332
4333
4334 ia64_psr(regs)->sp = 0;
4335 DPRINT(("clearing psr.sp for [%d]\n", task_pid_nr(task)));
4336
4337 SET_LAST_CPU(ctx, smp_processor_id());
4338 INC_ACTIVATION();
4339 SET_ACTIVATION(ctx);
4340#ifndef CONFIG_SMP
4341
4342
4343
4344 owner_task = GET_PMU_OWNER();
4345 if (owner_task) pfm_lazy_save_regs(owner_task);
4346#endif
4347 }
4348
4349
4350
4351
4352 pfm_restore_pmds(pmds_source, ctx->ctx_all_pmds[0]);
4353 pfm_restore_pmcs(pmcs_source, ctx->ctx_all_pmcs[0]);
4354
4355 ctx->ctx_reload_pmcs[0] = 0UL;
4356 ctx->ctx_reload_pmds[0] = 0UL;
4357
4358
4359
4360
4361 if (ctx->ctx_fl_using_dbreg) {
4362 pfm_restore_ibrs(ctx->ctx_ibrs, pmu_conf->num_ibrs);
4363 pfm_restore_dbrs(ctx->ctx_dbrs, pmu_conf->num_dbrs);
4364 }
4365
4366
4367
4368 SET_PMU_OWNER(task, ctx);
4369
4370 DPRINT(("context loaded on PMU for [%d]\n", task_pid_nr(task)));
4371 } else {
4372
4373
4374
4375 regs = task_pt_regs(task);
4376
4377
4378 ctx->ctx_last_activation = PFM_INVALID_ACTIVATION;
4379 SET_LAST_CPU(ctx, -1);
4380
4381
4382 ctx->ctx_saved_psr_up = 0UL;
4383 ia64_psr(regs)->up = ia64_psr(regs)->pp = 0;
4384 }
4385
4386 ret = 0;
4387
4388error_unres:
4389 if (ret) pfm_unreserve_session(ctx, ctx->ctx_fl_system, the_cpu);
4390error:
4391
4392
4393
4394 if (ret && set_dbregs) {
4395 LOCK_PFS(flags);
4396 pfm_sessions.pfs_sys_use_dbregs--;
4397 UNLOCK_PFS(flags);
4398 }
4399
4400
4401
4402 if (is_system == 0 && task != current) {
4403 pfm_put_task(task);
4404
4405 if (ret == 0) {
4406 ret = pfm_check_task_exist(ctx);
4407 if (ret) {
4408 ctx->ctx_state = PFM_CTX_UNLOADED;
4409 ctx->ctx_task = NULL;
4410 }
4411 }
4412 }
4413 return ret;
4414}
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424static void pfm_flush_pmds(struct task_struct *, pfm_context_t *ctx);
4425
4426static int
4427pfm_context_unload(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
4428{
4429 struct task_struct *task = PFM_CTX_TASK(ctx);
4430 struct pt_regs *tregs;
4431 int prev_state, is_system;
4432 int ret;
4433
4434 DPRINT(("ctx_state=%d task [%d]\n", ctx->ctx_state, task ? task_pid_nr(task) : -1));
4435
4436 prev_state = ctx->ctx_state;
4437 is_system = ctx->ctx_fl_system;
4438
4439
4440
4441
4442 if (prev_state == PFM_CTX_UNLOADED) {
4443 DPRINT(("ctx_state=%d, nothing to do\n", prev_state));
4444 return 0;
4445 }
4446
4447
4448
4449
4450 ret = pfm_stop(ctx, NULL, 0, regs);
4451 if (ret) return ret;
4452
4453 ctx->ctx_state = PFM_CTX_UNLOADED;
4454
4455
4456
4457
4458
4459
4460 if (is_system) {
4461
4462
4463
4464
4465
4466
4467 PFM_CPUINFO_CLEAR(PFM_CPUINFO_SYST_WIDE);
4468 PFM_CPUINFO_CLEAR(PFM_CPUINFO_EXCL_IDLE);
4469
4470
4471
4472
4473
4474 pfm_flush_pmds(current, ctx);
4475
4476
4477
4478
4479
4480 if (prev_state != PFM_CTX_ZOMBIE)
4481 pfm_unreserve_session(ctx, 1 , ctx->ctx_cpu);
4482
4483
4484
4485
4486 task->thread.pfm_context = NULL;
4487
4488
4489
4490 ctx->ctx_task = NULL;
4491
4492
4493
4494
4495 return 0;
4496 }
4497
4498
4499
4500
4501 tregs = task == current ? regs : task_pt_regs(task);
4502
4503 if (task == current) {
4504
4505
4506
4507 ia64_psr(regs)->sp = 1;
4508
4509 DPRINT(("setting psr.sp for [%d]\n", task_pid_nr(task)));
4510 }
4511
4512
4513
4514
4515 pfm_flush_pmds(task, ctx);
4516
4517
4518
4519
4520
4521
4522
4523 if (prev_state != PFM_CTX_ZOMBIE)
4524 pfm_unreserve_session(ctx, 0 , ctx->ctx_cpu);
4525
4526
4527
4528
4529 ctx->ctx_last_activation = PFM_INVALID_ACTIVATION;
4530 SET_LAST_CPU(ctx, -1);
4531
4532
4533
4534
4535 task->thread.flags &= ~IA64_THREAD_PM_VALID;
4536
4537
4538
4539
4540 task->thread.pfm_context = NULL;
4541 ctx->ctx_task = NULL;
4542
4543 PFM_SET_WORK_PENDING(task, 0);
4544
4545 ctx->ctx_fl_trap_reason = PFM_TRAP_REASON_NONE;
4546 ctx->ctx_fl_can_restart = 0;
4547 ctx->ctx_fl_going_zombie = 0;
4548
4549 DPRINT(("disconnected [%d] from context\n", task_pid_nr(task)));
4550
4551 return 0;
4552}
4553
4554
4555
4556
4557
4558
4559void
4560pfm_exit_thread(struct task_struct *task)
4561{
4562 pfm_context_t *ctx;
4563 unsigned long flags;
4564 struct pt_regs *regs = task_pt_regs(task);
4565 int ret, state;
4566 int free_ok = 0;
4567
4568 ctx = PFM_GET_CTX(task);
4569
4570 PROTECT_CTX(ctx, flags);
4571
4572 DPRINT(("state=%d task [%d]\n", ctx->ctx_state, task_pid_nr(task)));
4573
4574 state = ctx->ctx_state;
4575 switch(state) {
4576 case PFM_CTX_UNLOADED:
4577
4578
4579
4580
4581 printk(KERN_ERR "perfmon: pfm_exit_thread [%d] ctx unloaded\n", task_pid_nr(task));
4582 break;
4583 case PFM_CTX_LOADED:
4584 case PFM_CTX_MASKED:
4585 ret = pfm_context_unload(ctx, NULL, 0, regs);
4586 if (ret) {
4587 printk(KERN_ERR "perfmon: pfm_exit_thread [%d] state=%d unload failed %d\n", task_pid_nr(task), state, ret);
4588 }
4589 DPRINT(("ctx unloaded for current state was %d\n", state));
4590
4591 pfm_end_notify_user(ctx);
4592 break;
4593 case PFM_CTX_ZOMBIE:
4594 ret = pfm_context_unload(ctx, NULL, 0, regs);
4595 if (ret) {
4596 printk(KERN_ERR "perfmon: pfm_exit_thread [%d] state=%d unload failed %d\n", task_pid_nr(task), state, ret);
4597 }
4598 free_ok = 1;
4599 break;
4600 default:
4601 printk(KERN_ERR "perfmon: pfm_exit_thread [%d] unexpected state=%d\n", task_pid_nr(task), state);
4602 break;
4603 }
4604 UNPROTECT_CTX(ctx, flags);
4605
4606 { u64 psr = pfm_get_psr();
4607 BUG_ON(psr & (IA64_PSR_UP|IA64_PSR_PP));
4608 BUG_ON(GET_PMU_OWNER());
4609 BUG_ON(ia64_psr(regs)->up);
4610 BUG_ON(ia64_psr(regs)->pp);
4611 }
4612
4613
4614
4615
4616
4617 if (free_ok) pfm_context_free(ctx);
4618}
4619
4620
4621
4622
4623#define PFM_CMD(name, flags, arg_count, arg_type, getsz) { name, #name, flags, arg_count, sizeof(arg_type), getsz }
4624#define PFM_CMD_S(name, flags) { name, #name, flags, 0, 0, NULL }
4625#define PFM_CMD_PCLRWS (PFM_CMD_FD|PFM_CMD_ARG_RW|PFM_CMD_STOP)
4626#define PFM_CMD_PCLRW (PFM_CMD_FD|PFM_CMD_ARG_RW)
4627#define PFM_CMD_NONE { NULL, "no-cmd", 0, 0, 0, NULL}
4628
4629static pfm_cmd_desc_t pfm_cmd_tab[]={
4630PFM_CMD_NONE,
4631PFM_CMD(pfm_write_pmcs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_reg_t, NULL),
4632PFM_CMD(pfm_write_pmds, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_reg_t, NULL),
4633PFM_CMD(pfm_read_pmds, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_reg_t, NULL),
4634PFM_CMD_S(pfm_stop, PFM_CMD_PCLRWS),
4635PFM_CMD_S(pfm_start, PFM_CMD_PCLRWS),
4636PFM_CMD_NONE,
4637PFM_CMD_NONE,
4638PFM_CMD(pfm_context_create, PFM_CMD_ARG_RW, 1, pfarg_context_t, pfm_ctx_getsize),
4639PFM_CMD_NONE,
4640PFM_CMD_S(pfm_restart, PFM_CMD_PCLRW),
4641PFM_CMD_NONE,
4642PFM_CMD(pfm_get_features, PFM_CMD_ARG_RW, 1, pfarg_features_t, NULL),
4643PFM_CMD(pfm_debug, 0, 1, unsigned int, NULL),
4644PFM_CMD_NONE,
4645PFM_CMD(pfm_get_pmc_reset, PFM_CMD_ARG_RW, PFM_CMD_ARG_MANY, pfarg_reg_t, NULL),
4646PFM_CMD(pfm_context_load, PFM_CMD_PCLRWS, 1, pfarg_load_t, NULL),
4647PFM_CMD_S(pfm_context_unload, PFM_CMD_PCLRWS),
4648PFM_CMD_NONE,
4649PFM_CMD_NONE,
4650PFM_CMD_NONE,
4651PFM_CMD_NONE,
4652PFM_CMD_NONE,
4653PFM_CMD_NONE,
4654PFM_CMD_NONE,
4655PFM_CMD_NONE,
4656PFM_CMD_NONE,
4657PFM_CMD_NONE,
4658PFM_CMD_NONE,
4659PFM_CMD_NONE,
4660PFM_CMD_NONE,
4661PFM_CMD_NONE,
4662PFM_CMD(pfm_write_ibrs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_dbreg_t, NULL),
4663PFM_CMD(pfm_write_dbrs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_dbreg_t, NULL)
4664};
4665#define PFM_CMD_COUNT (sizeof(pfm_cmd_tab)/sizeof(pfm_cmd_desc_t))
4666
4667static int
4668pfm_check_task_state(pfm_context_t *ctx, int cmd, unsigned long flags)
4669{
4670 struct task_struct *task;
4671 int state, old_state;
4672
4673recheck:
4674 state = ctx->ctx_state;
4675 task = ctx->ctx_task;
4676
4677 if (task == NULL) {
4678 DPRINT(("context %d no task, state=%d\n", ctx->ctx_fd, state));
4679 return 0;
4680 }
4681
4682 DPRINT(("context %d state=%d [%d] task_state=%ld must_stop=%d\n",
4683 ctx->ctx_fd,
4684 state,
4685 task_pid_nr(task),
4686 task->state, PFM_CMD_STOPPED(cmd)));
4687
4688
4689
4690
4691
4692
4693
4694
4695 if (task == current || ctx->ctx_fl_system) return 0;
4696
4697
4698
4699
4700 switch(state) {
4701 case PFM_CTX_UNLOADED:
4702
4703
4704
4705 return 0;
4706 case PFM_CTX_ZOMBIE:
4707
4708
4709
4710 DPRINT(("cmd %d state zombie cannot operate on context\n", cmd));
4711 return -EINVAL;
4712 case PFM_CTX_MASKED:
4713
4714
4715
4716
4717 if (cmd != PFM_UNLOAD_CONTEXT) return 0;
4718 }
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730 if (PFM_CMD_STOPPED(cmd)) {
4731 if (!task_is_stopped_or_traced(task)) {
4732 DPRINT(("[%d] task not in stopped state\n", task_pid_nr(task)));
4733 return -EBUSY;
4734 }
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749 old_state = state;
4750
4751 UNPROTECT_CTX(ctx, flags);
4752
4753 wait_task_inactive(task, 0);
4754
4755 PROTECT_CTX(ctx, flags);
4756
4757
4758
4759
4760 if (ctx->ctx_state != old_state) {
4761 DPRINT(("old_state=%d new_state=%d\n", old_state, ctx->ctx_state));
4762 goto recheck;
4763 }
4764 }
4765 return 0;
4766}
4767
4768
4769
4770
4771asmlinkage long
4772sys_perfmonctl (int fd, int cmd, void __user *arg, int count)
4773{
4774 struct fd f = {NULL, 0};
4775 pfm_context_t *ctx = NULL;
4776 unsigned long flags = 0UL;
4777 void *args_k = NULL;
4778 long ret;
4779 size_t base_sz, sz, xtra_sz = 0;
4780 int narg, completed_args = 0, call_made = 0, cmd_flags;
4781 int (*func)(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs);
4782 int (*getsize)(void *arg, size_t *sz);
4783#define PFM_MAX_ARGSIZE 4096
4784
4785
4786
4787
4788 if (unlikely(pmu_conf == NULL)) return -ENOSYS;
4789
4790 if (unlikely(cmd < 0 || cmd >= PFM_CMD_COUNT)) {
4791 DPRINT(("invalid cmd=%d\n", cmd));
4792 return -EINVAL;
4793 }
4794
4795 func = pfm_cmd_tab[cmd].cmd_func;
4796 narg = pfm_cmd_tab[cmd].cmd_narg;
4797 base_sz = pfm_cmd_tab[cmd].cmd_argsize;
4798 getsize = pfm_cmd_tab[cmd].cmd_getsize;
4799 cmd_flags = pfm_cmd_tab[cmd].cmd_flags;
4800
4801 if (unlikely(func == NULL)) {
4802 DPRINT(("invalid cmd=%d\n", cmd));
4803 return -EINVAL;
4804 }
4805
4806 DPRINT(("cmd=%s idx=%d narg=0x%x argsz=%lu count=%d\n",
4807 PFM_CMD_NAME(cmd),
4808 cmd,
4809 narg,
4810 base_sz,
4811 count));
4812
4813
4814
4815
4816 if (unlikely((narg == PFM_CMD_ARG_MANY && count <= 0) || (narg > 0 && narg != count)))
4817 return -EINVAL;
4818
4819restart_args:
4820 sz = xtra_sz + base_sz*count;
4821
4822
4823
4824 if (unlikely(sz > PFM_MAX_ARGSIZE)) {
4825 printk(KERN_ERR "perfmon: [%d] argument too big %lu\n", task_pid_nr(current), sz);
4826 return -E2BIG;
4827 }
4828
4829
4830
4831
4832 if (likely(count && args_k == NULL)) {
4833 args_k = kmalloc(PFM_MAX_ARGSIZE, GFP_KERNEL);
4834 if (args_k == NULL) return -ENOMEM;
4835 }
4836
4837 ret = -EFAULT;
4838
4839
4840
4841
4842
4843
4844 if (sz && copy_from_user(args_k, arg, sz)) {
4845 DPRINT(("cannot copy_from_user %lu bytes @%p\n", sz, arg));
4846 goto error_args;
4847 }
4848
4849
4850
4851
4852 if (completed_args == 0 && getsize) {
4853
4854
4855
4856 ret = (*getsize)(args_k, &xtra_sz);
4857 if (ret) goto error_args;
4858
4859 completed_args = 1;
4860
4861 DPRINT(("restart_args sz=%lu xtra_sz=%lu\n", sz, xtra_sz));
4862
4863
4864 if (likely(xtra_sz)) goto restart_args;
4865 }
4866
4867 if (unlikely((cmd_flags & PFM_CMD_FD) == 0)) goto skip_fd;
4868
4869 ret = -EBADF;
4870
4871 f = fdget(fd);
4872 if (unlikely(f.file == NULL)) {
4873 DPRINT(("invalid fd %d\n", fd));
4874 goto error_args;
4875 }
4876 if (unlikely(PFM_IS_FILE(f.file) == 0)) {
4877 DPRINT(("fd %d not related to perfmon\n", fd));
4878 goto error_args;
4879 }
4880
4881 ctx = f.file->private_data;
4882 if (unlikely(ctx == NULL)) {
4883 DPRINT(("no context for fd %d\n", fd));
4884 goto error_args;
4885 }
4886 prefetch(&ctx->ctx_state);
4887
4888 PROTECT_CTX(ctx, flags);
4889
4890
4891
4892
4893 ret = pfm_check_task_state(ctx, cmd, flags);
4894 if (unlikely(ret)) goto abort_locked;
4895
4896skip_fd:
4897 ret = (*func)(ctx, args_k, count, task_pt_regs(current));
4898
4899 call_made = 1;
4900
4901abort_locked:
4902 if (likely(ctx)) {
4903 DPRINT(("context unlocked\n"));
4904 UNPROTECT_CTX(ctx, flags);
4905 }
4906
4907
4908 if (call_made && PFM_CMD_RW_ARG(cmd) && copy_to_user(arg, args_k, base_sz*count)) ret = -EFAULT;
4909
4910error_args:
4911 if (f.file)
4912 fdput(f);
4913
4914 kfree(args_k);
4915
4916 DPRINT(("cmd=%s ret=%ld\n", PFM_CMD_NAME(cmd), ret));
4917
4918 return ret;
4919}
4920
4921static void
4922pfm_resume_after_ovfl(pfm_context_t *ctx, unsigned long ovfl_regs, struct pt_regs *regs)
4923{
4924 pfm_buffer_fmt_t *fmt = ctx->ctx_buf_fmt;
4925 pfm_ovfl_ctrl_t rst_ctrl;
4926 int state;
4927 int ret = 0;
4928
4929 state = ctx->ctx_state;
4930
4931
4932
4933
4934 if (CTX_HAS_SMPL(ctx)) {
4935
4936 rst_ctrl.bits.mask_monitoring = 0;
4937 rst_ctrl.bits.reset_ovfl_pmds = 0;
4938
4939 if (state == PFM_CTX_LOADED)
4940 ret = pfm_buf_fmt_restart_active(fmt, current, &rst_ctrl, ctx->ctx_smpl_hdr, regs);
4941 else
4942 ret = pfm_buf_fmt_restart(fmt, current, &rst_ctrl, ctx->ctx_smpl_hdr, regs);
4943 } else {
4944 rst_ctrl.bits.mask_monitoring = 0;
4945 rst_ctrl.bits.reset_ovfl_pmds = 1;
4946 }
4947
4948 if (ret == 0) {
4949 if (rst_ctrl.bits.reset_ovfl_pmds) {
4950 pfm_reset_regs(ctx, &ovfl_regs, PFM_PMD_LONG_RESET);
4951 }
4952 if (rst_ctrl.bits.mask_monitoring == 0) {
4953 DPRINT(("resuming monitoring\n"));
4954 if (ctx->ctx_state == PFM_CTX_MASKED) pfm_restore_monitoring(current);
4955 } else {
4956 DPRINT(("stopping monitoring\n"));
4957
4958 }
4959 ctx->ctx_state = PFM_CTX_LOADED;
4960 }
4961}
4962
4963
4964
4965
4966
4967static void
4968pfm_context_force_terminate(pfm_context_t *ctx, struct pt_regs *regs)
4969{
4970 int ret;
4971
4972 DPRINT(("entering for [%d]\n", task_pid_nr(current)));
4973
4974 ret = pfm_context_unload(ctx, NULL, 0, regs);
4975 if (ret) {
4976 printk(KERN_ERR "pfm_context_force_terminate: [%d] unloaded failed with %d\n", task_pid_nr(current), ret);
4977 }
4978
4979
4980
4981
4982 wake_up_interruptible(&ctx->ctx_zombieq);
4983
4984
4985
4986
4987
4988
4989}
4990
4991static int pfm_ovfl_notify_user(pfm_context_t *ctx, unsigned long ovfl_pmds);
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002void
5003pfm_handle_work(void)
5004{
5005 pfm_context_t *ctx;
5006 struct pt_regs *regs;
5007 unsigned long flags, dummy_flags;
5008 unsigned long ovfl_regs;
5009 unsigned int reason;
5010 int ret;
5011
5012 ctx = PFM_GET_CTX(current);
5013 if (ctx == NULL) {
5014 printk(KERN_ERR "perfmon: [%d] has no PFM context\n",
5015 task_pid_nr(current));
5016 return;
5017 }
5018
5019 PROTECT_CTX(ctx, flags);
5020
5021 PFM_SET_WORK_PENDING(current, 0);
5022
5023 regs = task_pt_regs(current);
5024
5025
5026
5027
5028 reason = ctx->ctx_fl_trap_reason;
5029 ctx->ctx_fl_trap_reason = PFM_TRAP_REASON_NONE;
5030 ovfl_regs = ctx->ctx_ovfl_regs[0];
5031
5032 DPRINT(("reason=%d state=%d\n", reason, ctx->ctx_state));
5033
5034
5035
5036
5037 if (ctx->ctx_fl_going_zombie || ctx->ctx_state == PFM_CTX_ZOMBIE)
5038 goto do_zombie;
5039
5040
5041 if (reason == PFM_TRAP_REASON_RESET)
5042 goto skip_blocking;
5043
5044
5045
5046
5047
5048 UNPROTECT_CTX(ctx, flags);
5049
5050
5051
5052
5053 local_irq_enable();
5054
5055 DPRINT(("before block sleeping\n"));
5056
5057
5058
5059
5060
5061 ret = wait_for_completion_interruptible(&ctx->ctx_restart_done);
5062
5063 DPRINT(("after block sleeping ret=%d\n", ret));
5064
5065
5066
5067
5068
5069
5070
5071 PROTECT_CTX(ctx, dummy_flags);
5072
5073
5074
5075
5076
5077
5078
5079 ovfl_regs = ctx->ctx_ovfl_regs[0];
5080
5081 if (ctx->ctx_fl_going_zombie) {
5082do_zombie:
5083 DPRINT(("context is zombie, bailing out\n"));
5084 pfm_context_force_terminate(ctx, regs);
5085 goto nothing_to_do;
5086 }
5087
5088
5089
5090 if (ret < 0)
5091 goto nothing_to_do;
5092
5093skip_blocking:
5094 pfm_resume_after_ovfl(ctx, ovfl_regs, regs);
5095 ctx->ctx_ovfl_regs[0] = 0UL;
5096
5097nothing_to_do:
5098
5099
5100
5101 UNPROTECT_CTX(ctx, flags);
5102}
5103
5104static int
5105pfm_notify_user(pfm_context_t *ctx, pfm_msg_t *msg)
5106{
5107 if (ctx->ctx_state == PFM_CTX_ZOMBIE) {
5108 DPRINT(("ignoring overflow notification, owner is zombie\n"));
5109 return 0;
5110 }
5111
5112 DPRINT(("waking up somebody\n"));
5113
5114 if (msg) wake_up_interruptible(&ctx->ctx_msgq_wait);
5115
5116
5117
5118
5119
5120 kill_fasync (&ctx->ctx_async_queue, SIGIO, POLL_IN);
5121
5122 return 0;
5123}
5124
5125static int
5126pfm_ovfl_notify_user(pfm_context_t *ctx, unsigned long ovfl_pmds)
5127{
5128 pfm_msg_t *msg = NULL;
5129
5130 if (ctx->ctx_fl_no_msg == 0) {
5131 msg = pfm_get_new_msg(ctx);
5132 if (msg == NULL) {
5133 printk(KERN_ERR "perfmon: pfm_ovfl_notify_user no more notification msgs\n");
5134 return -1;
5135 }
5136
5137 msg->pfm_ovfl_msg.msg_type = PFM_MSG_OVFL;
5138 msg->pfm_ovfl_msg.msg_ctx_fd = ctx->ctx_fd;
5139 msg->pfm_ovfl_msg.msg_active_set = 0;
5140 msg->pfm_ovfl_msg.msg_ovfl_pmds[0] = ovfl_pmds;
5141 msg->pfm_ovfl_msg.msg_ovfl_pmds[1] = 0UL;
5142 msg->pfm_ovfl_msg.msg_ovfl_pmds[2] = 0UL;
5143 msg->pfm_ovfl_msg.msg_ovfl_pmds[3] = 0UL;
5144 msg->pfm_ovfl_msg.msg_tstamp = 0UL;
5145 }
5146
5147 DPRINT(("ovfl msg: msg=%p no_msg=%d fd=%d ovfl_pmds=0x%lx\n",
5148 msg,
5149 ctx->ctx_fl_no_msg,
5150 ctx->ctx_fd,
5151 ovfl_pmds));
5152
5153 return pfm_notify_user(ctx, msg);
5154}
5155
5156static int
5157pfm_end_notify_user(pfm_context_t *ctx)
5158{
5159 pfm_msg_t *msg;
5160
5161 msg = pfm_get_new_msg(ctx);
5162 if (msg == NULL) {
5163 printk(KERN_ERR "perfmon: pfm_end_notify_user no more notification msgs\n");
5164 return -1;
5165 }
5166
5167 memset(msg, 0, sizeof(*msg));
5168
5169 msg->pfm_end_msg.msg_type = PFM_MSG_END;
5170 msg->pfm_end_msg.msg_ctx_fd = ctx->ctx_fd;
5171 msg->pfm_ovfl_msg.msg_tstamp = 0UL;
5172
5173 DPRINT(("end msg: msg=%p no_msg=%d ctx_fd=%d\n",
5174 msg,
5175 ctx->ctx_fl_no_msg,
5176 ctx->ctx_fd));
5177
5178 return pfm_notify_user(ctx, msg);
5179}
5180
5181
5182
5183
5184
5185static void pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx,
5186 unsigned long pmc0, struct pt_regs *regs)
5187{
5188 pfm_ovfl_arg_t *ovfl_arg;
5189 unsigned long mask;
5190 unsigned long old_val, ovfl_val, new_val;
5191 unsigned long ovfl_notify = 0UL, ovfl_pmds = 0UL, smpl_pmds = 0UL, reset_pmds;
5192 unsigned long tstamp;
5193 pfm_ovfl_ctrl_t ovfl_ctrl;
5194 unsigned int i, has_smpl;
5195 int must_notify = 0;
5196
5197 if (unlikely(ctx->ctx_state == PFM_CTX_ZOMBIE)) goto stop_monitoring;
5198
5199
5200
5201
5202 if (unlikely((pmc0 & 0x1) == 0)) goto sanity_check;
5203
5204 tstamp = ia64_get_itc();
5205 mask = pmc0 >> PMU_FIRST_COUNTER;
5206 ovfl_val = pmu_conf->ovfl_val;
5207 has_smpl = CTX_HAS_SMPL(ctx);
5208
5209 DPRINT_ovfl(("pmc0=0x%lx pid=%d iip=0x%lx, %s "
5210 "used_pmds=0x%lx\n",
5211 pmc0,
5212 task ? task_pid_nr(task): -1,
5213 (regs ? regs->cr_iip : 0),
5214 CTX_OVFL_NOBLOCK(ctx) ? "nonblocking" : "blocking",
5215 ctx->ctx_used_pmds[0]));
5216
5217
5218
5219
5220
5221
5222 for (i = PMU_FIRST_COUNTER; mask ; i++, mask >>= 1) {
5223
5224
5225 if ((mask & 0x1) == 0) continue;
5226
5227
5228
5229
5230
5231
5232
5233 old_val = new_val = ctx->ctx_pmds[i].val;
5234 new_val += 1 + ovfl_val;
5235 ctx->ctx_pmds[i].val = new_val;
5236
5237
5238
5239
5240 if (likely(old_val > new_val)) {
5241 ovfl_pmds |= 1UL << i;
5242 if (PMC_OVFL_NOTIFY(ctx, i)) ovfl_notify |= 1UL << i;
5243 }
5244
5245 DPRINT_ovfl(("ctx_pmd[%d].val=0x%lx old_val=0x%lx pmd=0x%lx ovfl_pmds=0x%lx ovfl_notify=0x%lx\n",
5246 i,
5247 new_val,
5248 old_val,
5249 ia64_get_pmd(i) & ovfl_val,
5250 ovfl_pmds,
5251 ovfl_notify));
5252 }
5253
5254
5255
5256
5257 if (ovfl_pmds == 0UL) return;
5258
5259
5260
5261
5262 ovfl_ctrl.val = 0;
5263 reset_pmds = 0UL;
5264
5265
5266
5267
5268
5269 if (has_smpl) {
5270 unsigned long start_cycles, end_cycles;
5271 unsigned long pmd_mask;
5272 int j, k, ret = 0;
5273 int this_cpu = smp_processor_id();
5274
5275 pmd_mask = ovfl_pmds >> PMU_FIRST_COUNTER;
5276 ovfl_arg = &ctx->ctx_ovfl_arg;
5277
5278 prefetch(ctx->ctx_smpl_hdr);
5279
5280 for(i=PMU_FIRST_COUNTER; pmd_mask && ret == 0; i++, pmd_mask >>=1) {
5281
5282 mask = 1UL << i;
5283
5284 if ((pmd_mask & 0x1) == 0) continue;
5285
5286 ovfl_arg->ovfl_pmd = (unsigned char )i;
5287 ovfl_arg->ovfl_notify = ovfl_notify & mask ? 1 : 0;
5288 ovfl_arg->active_set = 0;
5289 ovfl_arg->ovfl_ctrl.val = 0;
5290 ovfl_arg->smpl_pmds[0] = smpl_pmds = ctx->ctx_pmds[i].smpl_pmds[0];
5291
5292 ovfl_arg->pmd_value = ctx->ctx_pmds[i].val;
5293 ovfl_arg->pmd_last_reset = ctx->ctx_pmds[i].lval;
5294 ovfl_arg->pmd_eventid = ctx->ctx_pmds[i].eventid;
5295
5296
5297
5298
5299
5300 if (smpl_pmds) {
5301 for(j=0, k=0; smpl_pmds; j++, smpl_pmds >>=1) {
5302 if ((smpl_pmds & 0x1) == 0) continue;
5303 ovfl_arg->smpl_pmds_values[k++] = PMD_IS_COUNTING(j) ? pfm_read_soft_counter(ctx, j) : ia64_get_pmd(j);
5304 DPRINT_ovfl(("smpl_pmd[%d]=pmd%u=0x%lx\n", k-1, j, ovfl_arg->smpl_pmds_values[k-1]));
5305 }
5306 }
5307
5308 pfm_stats[this_cpu].pfm_smpl_handler_calls++;
5309
5310 start_cycles = ia64_get_itc();
5311
5312
5313
5314
5315 ret = (*ctx->ctx_buf_fmt->fmt_handler)(task, ctx->ctx_smpl_hdr, ovfl_arg, regs, tstamp);
5316
5317 end_cycles = ia64_get_itc();
5318
5319
5320
5321
5322
5323 ovfl_ctrl.bits.notify_user |= ovfl_arg->ovfl_ctrl.bits.notify_user;
5324 ovfl_ctrl.bits.block_task |= ovfl_arg->ovfl_ctrl.bits.block_task;
5325 ovfl_ctrl.bits.mask_monitoring |= ovfl_arg->ovfl_ctrl.bits.mask_monitoring;
5326
5327
5328
5329 if (ovfl_arg->ovfl_ctrl.bits.reset_ovfl_pmds) reset_pmds |= mask;
5330
5331 pfm_stats[this_cpu].pfm_smpl_handler_cycles += end_cycles - start_cycles;
5332 }
5333
5334
5335
5336 if (ret && pmd_mask) {
5337 DPRINT(("handler aborts leftover ovfl_pmds=0x%lx\n",
5338 pmd_mask<<PMU_FIRST_COUNTER));
5339 }
5340
5341
5342
5343 ovfl_pmds &= ~reset_pmds;
5344 } else {
5345
5346
5347
5348
5349 ovfl_ctrl.bits.notify_user = ovfl_notify ? 1 : 0;
5350 ovfl_ctrl.bits.block_task = ovfl_notify ? 1 : 0;
5351 ovfl_ctrl.bits.mask_monitoring = ovfl_notify ? 1 : 0;
5352 ovfl_ctrl.bits.reset_ovfl_pmds = ovfl_notify ? 0 : 1;
5353
5354
5355
5356 if (ovfl_notify == 0) reset_pmds = ovfl_pmds;
5357 }
5358
5359 DPRINT_ovfl(("ovfl_pmds=0x%lx reset_pmds=0x%lx\n", ovfl_pmds, reset_pmds));
5360
5361
5362
5363
5364 if (reset_pmds) {
5365 unsigned long bm = reset_pmds;
5366 pfm_reset_regs(ctx, &bm, PFM_PMD_SHORT_RESET);
5367 }
5368
5369 if (ovfl_notify && ovfl_ctrl.bits.notify_user) {
5370
5371
5372
5373 ctx->ctx_ovfl_regs[0] = ovfl_pmds;
5374
5375
5376
5377
5378 if (CTX_OVFL_NOBLOCK(ctx) == 0 && ovfl_ctrl.bits.block_task) {
5379
5380 ctx->ctx_fl_trap_reason = PFM_TRAP_REASON_BLOCK;
5381
5382
5383
5384
5385 PFM_SET_WORK_PENDING(task, 1);
5386
5387
5388
5389
5390
5391 set_notify_resume(task);
5392 }
5393
5394
5395
5396
5397 must_notify = 1;
5398 }
5399
5400 DPRINT_ovfl(("owner [%d] pending=%ld reason=%u ovfl_pmds=0x%lx ovfl_notify=0x%lx masked=%d\n",
5401 GET_PMU_OWNER() ? task_pid_nr(GET_PMU_OWNER()) : -1,
5402 PFM_GET_WORK_PENDING(task),
5403 ctx->ctx_fl_trap_reason,
5404 ovfl_pmds,
5405 ovfl_notify,
5406 ovfl_ctrl.bits.mask_monitoring ? 1 : 0));
5407
5408
5409
5410 if (ovfl_ctrl.bits.mask_monitoring) {
5411 pfm_mask_monitoring(task);
5412 ctx->ctx_state = PFM_CTX_MASKED;
5413 ctx->ctx_fl_can_restart = 1;
5414 }
5415
5416
5417
5418
5419 if (must_notify) pfm_ovfl_notify_user(ctx, ovfl_notify);
5420
5421 return;
5422
5423sanity_check:
5424 printk(KERN_ERR "perfmon: CPU%d overflow handler [%d] pmc0=0x%lx\n",
5425 smp_processor_id(),
5426 task ? task_pid_nr(task) : -1,
5427 pmc0);
5428 return;
5429
5430stop_monitoring:
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459 DPRINT(("ctx is zombie for [%d], converted to spurious\n", task ? task_pid_nr(task): -1));
5460 pfm_clear_psr_up();
5461 ia64_psr(regs)->up = 0;
5462 ia64_psr(regs)->sp = 1;
5463 return;
5464}
5465
5466static int
5467pfm_do_interrupt_handler(void *arg, struct pt_regs *regs)
5468{
5469 struct task_struct *task;
5470 pfm_context_t *ctx;
5471 unsigned long flags;
5472 u64 pmc0;
5473 int this_cpu = smp_processor_id();
5474 int retval = 0;
5475
5476 pfm_stats[this_cpu].pfm_ovfl_intr_count++;
5477
5478
5479
5480
5481 pmc0 = ia64_get_pmc(0);
5482
5483 task = GET_PMU_OWNER();
5484 ctx = GET_PMU_CTX();
5485
5486
5487
5488
5489
5490 if (PMC0_HAS_OVFL(pmc0) && task) {
5491
5492
5493
5494
5495
5496 if (!ctx) goto report_spurious1;
5497
5498 if (ctx->ctx_fl_system == 0 && (task->thread.flags & IA64_THREAD_PM_VALID) == 0)
5499 goto report_spurious2;
5500
5501 PROTECT_CTX_NOPRINT(ctx, flags);
5502
5503 pfm_overflow_handler(task, ctx, pmc0, regs);
5504
5505 UNPROTECT_CTX_NOPRINT(ctx, flags);
5506
5507 } else {
5508 pfm_stats[this_cpu].pfm_spurious_ovfl_intr_count++;
5509 retval = -1;
5510 }
5511
5512
5513
5514 pfm_unfreeze_pmu();
5515
5516 return retval;
5517
5518report_spurious1:
5519 printk(KERN_INFO "perfmon: spurious overflow interrupt on CPU%d: process %d has no PFM context\n",
5520 this_cpu, task_pid_nr(task));
5521 pfm_unfreeze_pmu();
5522 return -1;
5523report_spurious2:
5524 printk(KERN_INFO "perfmon: spurious overflow interrupt on CPU%d: process %d, invalid flag\n",
5525 this_cpu,
5526 task_pid_nr(task));
5527 pfm_unfreeze_pmu();
5528 return -1;
5529}
5530
5531static irqreturn_t
5532pfm_interrupt_handler(int irq, void *arg)
5533{
5534 unsigned long start_cycles, total_cycles;
5535 unsigned long min, max;
5536 int this_cpu;
5537 int ret;
5538 struct pt_regs *regs = get_irq_regs();
5539
5540 this_cpu = get_cpu();
5541 if (likely(!pfm_alt_intr_handler)) {
5542 min = pfm_stats[this_cpu].pfm_ovfl_intr_cycles_min;
5543 max = pfm_stats[this_cpu].pfm_ovfl_intr_cycles_max;
5544
5545 start_cycles = ia64_get_itc();
5546
5547 ret = pfm_do_interrupt_handler(arg, regs);
5548
5549 total_cycles = ia64_get_itc();
5550
5551
5552
5553
5554 if (likely(ret == 0)) {
5555 total_cycles -= start_cycles;
5556
5557 if (total_cycles < min) pfm_stats[this_cpu].pfm_ovfl_intr_cycles_min = total_cycles;
5558 if (total_cycles > max) pfm_stats[this_cpu].pfm_ovfl_intr_cycles_max = total_cycles;
5559
5560 pfm_stats[this_cpu].pfm_ovfl_intr_cycles += total_cycles;
5561 }
5562 }
5563 else {
5564 (*pfm_alt_intr_handler->handler)(irq, arg, regs);
5565 }
5566
5567 put_cpu();
5568 return IRQ_HANDLED;
5569}
5570
5571
5572
5573
5574
5575#define PFM_PROC_SHOW_HEADER ((void *)(long)nr_cpu_ids+1)
5576
5577static void *
5578pfm_proc_start(struct seq_file *m, loff_t *pos)
5579{
5580 if (*pos == 0) {
5581 return PFM_PROC_SHOW_HEADER;
5582 }
5583
5584 while (*pos <= nr_cpu_ids) {
5585 if (cpu_online(*pos - 1)) {
5586 return (void *)*pos;
5587 }
5588 ++*pos;
5589 }
5590 return NULL;
5591}
5592
5593static void *
5594pfm_proc_next(struct seq_file *m, void *v, loff_t *pos)
5595{
5596 ++*pos;
5597 return pfm_proc_start(m, pos);
5598}
5599
5600static void
5601pfm_proc_stop(struct seq_file *m, void *v)
5602{
5603}
5604
5605static void
5606pfm_proc_show_header(struct seq_file *m)
5607{
5608 struct list_head * pos;
5609 pfm_buffer_fmt_t * entry;
5610 unsigned long flags;
5611
5612 seq_printf(m,
5613 "perfmon version : %u.%u\n"
5614 "model : %s\n"
5615 "fastctxsw : %s\n"
5616 "expert mode : %s\n"
5617 "ovfl_mask : 0x%lx\n"
5618 "PMU flags : 0x%x\n",
5619 PFM_VERSION_MAJ, PFM_VERSION_MIN,
5620 pmu_conf->pmu_name,
5621 pfm_sysctl.fastctxsw > 0 ? "Yes": "No",
5622 pfm_sysctl.expert_mode > 0 ? "Yes": "No",
5623 pmu_conf->ovfl_val,
5624 pmu_conf->flags);
5625
5626 LOCK_PFS(flags);
5627
5628 seq_printf(m,
5629 "proc_sessions : %u\n"
5630 "sys_sessions : %u\n"
5631 "sys_use_dbregs : %u\n"
5632 "ptrace_use_dbregs : %u\n",
5633 pfm_sessions.pfs_task_sessions,
5634 pfm_sessions.pfs_sys_sessions,
5635 pfm_sessions.pfs_sys_use_dbregs,
5636 pfm_sessions.pfs_ptrace_use_dbregs);
5637
5638 UNLOCK_PFS(flags);
5639
5640 spin_lock(&pfm_buffer_fmt_lock);
5641
5642 list_for_each(pos, &pfm_buffer_fmt_list) {
5643 entry = list_entry(pos, pfm_buffer_fmt_t, fmt_list);
5644 seq_printf(m, "format : %16phD %s\n",
5645 entry->fmt_uuid, entry->fmt_name);
5646 }
5647 spin_unlock(&pfm_buffer_fmt_lock);
5648
5649}
5650
5651static int
5652pfm_proc_show(struct seq_file *m, void *v)
5653{
5654 unsigned long psr;
5655 unsigned int i;
5656 int cpu;
5657
5658 if (v == PFM_PROC_SHOW_HEADER) {
5659 pfm_proc_show_header(m);
5660 return 0;
5661 }
5662
5663
5664
5665 cpu = (long)v - 1;
5666 seq_printf(m,
5667 "CPU%-2d overflow intrs : %lu\n"
5668 "CPU%-2d overflow cycles : %lu\n"
5669 "CPU%-2d overflow min : %lu\n"
5670 "CPU%-2d overflow max : %lu\n"
5671 "CPU%-2d smpl handler calls : %lu\n"
5672 "CPU%-2d smpl handler cycles : %lu\n"
5673 "CPU%-2d spurious intrs : %lu\n"
5674 "CPU%-2d replay intrs : %lu\n"
5675 "CPU%-2d syst_wide : %d\n"
5676 "CPU%-2d dcr_pp : %d\n"
5677 "CPU%-2d exclude idle : %d\n"
5678 "CPU%-2d owner : %d\n"
5679 "CPU%-2d context : %p\n"
5680 "CPU%-2d activations : %lu\n",
5681 cpu, pfm_stats[cpu].pfm_ovfl_intr_count,
5682 cpu, pfm_stats[cpu].pfm_ovfl_intr_cycles,
5683 cpu, pfm_stats[cpu].pfm_ovfl_intr_cycles_min,
5684 cpu, pfm_stats[cpu].pfm_ovfl_intr_cycles_max,
5685 cpu, pfm_stats[cpu].pfm_smpl_handler_calls,
5686 cpu, pfm_stats[cpu].pfm_smpl_handler_cycles,
5687 cpu, pfm_stats[cpu].pfm_spurious_ovfl_intr_count,
5688 cpu, pfm_stats[cpu].pfm_replay_ovfl_intr_count,
5689 cpu, pfm_get_cpu_data(pfm_syst_info, cpu) & PFM_CPUINFO_SYST_WIDE ? 1 : 0,
5690 cpu, pfm_get_cpu_data(pfm_syst_info, cpu) & PFM_CPUINFO_DCR_PP ? 1 : 0,
5691 cpu, pfm_get_cpu_data(pfm_syst_info, cpu) & PFM_CPUINFO_EXCL_IDLE ? 1 : 0,
5692 cpu, pfm_get_cpu_data(pmu_owner, cpu) ? pfm_get_cpu_data(pmu_owner, cpu)->pid: -1,
5693 cpu, pfm_get_cpu_data(pmu_ctx, cpu),
5694 cpu, pfm_get_cpu_data(pmu_activation_number, cpu));
5695
5696 if (num_online_cpus() == 1 && pfm_sysctl.debug > 0) {
5697
5698 psr = pfm_get_psr();
5699
5700 ia64_srlz_d();
5701
5702 seq_printf(m,
5703 "CPU%-2d psr : 0x%lx\n"
5704 "CPU%-2d pmc0 : 0x%lx\n",
5705 cpu, psr,
5706 cpu, ia64_get_pmc(0));
5707
5708 for (i=0; PMC_IS_LAST(i) == 0; i++) {
5709 if (PMC_IS_COUNTING(i) == 0) continue;
5710 seq_printf(m,
5711 "CPU%-2d pmc%u : 0x%lx\n"
5712 "CPU%-2d pmd%u : 0x%lx\n",
5713 cpu, i, ia64_get_pmc(i),
5714 cpu, i, ia64_get_pmd(i));
5715 }
5716 }
5717 return 0;
5718}
5719
5720const struct seq_operations pfm_seq_ops = {
5721 .start = pfm_proc_start,
5722 .next = pfm_proc_next,
5723 .stop = pfm_proc_stop,
5724 .show = pfm_proc_show
5725};
5726
5727static int
5728pfm_proc_open(struct inode *inode, struct file *file)
5729{
5730 return seq_open(file, &pfm_seq_ops);
5731}
5732
5733
5734
5735
5736
5737
5738
5739
5740void
5741pfm_syst_wide_update_task(struct task_struct *task, unsigned long info, int is_ctxswin)
5742{
5743 struct pt_regs *regs;
5744 unsigned long dcr;
5745 unsigned long dcr_pp;
5746
5747 dcr_pp = info & PFM_CPUINFO_DCR_PP ? 1 : 0;
5748
5749
5750
5751
5752
5753 if ((info & PFM_CPUINFO_EXCL_IDLE) == 0 || task->pid) {
5754 regs = task_pt_regs(task);
5755 ia64_psr(regs)->pp = is_ctxswin ? dcr_pp : 0;
5756 return;
5757 }
5758
5759
5760
5761 if (dcr_pp) {
5762 dcr = ia64_getreg(_IA64_REG_CR_DCR);
5763
5764
5765
5766 if (is_ctxswin) {
5767
5768 ia64_setreg(_IA64_REG_CR_DCR, dcr & ~IA64_DCR_PP);
5769 pfm_clear_psr_pp();
5770 ia64_srlz_i();
5771 return;
5772 }
5773
5774
5775
5776
5777
5778
5779
5780 ia64_setreg(_IA64_REG_CR_DCR, dcr |IA64_DCR_PP);
5781 pfm_set_psr_pp();
5782 ia64_srlz_i();
5783 }
5784}
5785
5786#ifdef CONFIG_SMP
5787
5788static void
5789pfm_force_cleanup(pfm_context_t *ctx, struct pt_regs *regs)
5790{
5791 struct task_struct *task = ctx->ctx_task;
5792
5793 ia64_psr(regs)->up = 0;
5794 ia64_psr(regs)->sp = 1;
5795
5796 if (GET_PMU_OWNER() == task) {
5797 DPRINT(("cleared ownership for [%d]\n",
5798 task_pid_nr(ctx->ctx_task)));
5799 SET_PMU_OWNER(NULL, NULL);
5800 }
5801
5802
5803
5804
5805 PFM_SET_WORK_PENDING(task, 0);
5806
5807 task->thread.pfm_context = NULL;
5808 task->thread.flags &= ~IA64_THREAD_PM_VALID;
5809
5810 DPRINT(("force cleanup for [%d]\n", task_pid_nr(task)));
5811}
5812
5813
5814
5815
5816
5817void
5818pfm_save_regs(struct task_struct *task)
5819{
5820 pfm_context_t *ctx;
5821 unsigned long flags;
5822 u64 psr;
5823
5824
5825 ctx = PFM_GET_CTX(task);
5826 if (ctx == NULL) return;
5827
5828
5829
5830
5831
5832
5833 flags = pfm_protect_ctx_ctxsw(ctx);
5834
5835 if (ctx->ctx_state == PFM_CTX_ZOMBIE) {
5836 struct pt_regs *regs = task_pt_regs(task);
5837
5838 pfm_clear_psr_up();
5839
5840 pfm_force_cleanup(ctx, regs);
5841
5842 BUG_ON(ctx->ctx_smpl_hdr);
5843
5844 pfm_unprotect_ctx_ctxsw(ctx, flags);
5845
5846 pfm_context_free(ctx);
5847 return;
5848 }
5849
5850
5851
5852
5853 ia64_srlz_d();
5854 psr = pfm_get_psr();
5855
5856 BUG_ON(psr & (IA64_PSR_I));
5857
5858
5859
5860
5861
5862
5863
5864
5865 pfm_clear_psr_up();
5866
5867
5868
5869
5870 ctx->ctx_saved_psr_up = psr & IA64_PSR_UP;
5871
5872
5873
5874
5875
5876
5877 SET_PMU_OWNER(NULL, NULL);
5878
5879
5880
5881
5882
5883
5884 pfm_save_pmds(ctx->th_pmds, ctx->ctx_used_pmds[0]);
5885
5886
5887
5888
5889
5890
5891 ctx->th_pmcs[0] = ia64_get_pmc(0);
5892
5893
5894
5895
5896 if (ctx->th_pmcs[0] & ~0x1UL) pfm_unfreeze_pmu();
5897
5898
5899
5900
5901
5902 pfm_unprotect_ctx_ctxsw(ctx, flags);
5903}
5904
5905#else
5906void
5907pfm_save_regs(struct task_struct *task)
5908{
5909 pfm_context_t *ctx;
5910 u64 psr;
5911
5912 ctx = PFM_GET_CTX(task);
5913 if (ctx == NULL) return;
5914
5915
5916
5917
5918 psr = pfm_get_psr();
5919
5920 BUG_ON(psr & (IA64_PSR_I));
5921
5922
5923
5924
5925
5926
5927
5928
5929 pfm_clear_psr_up();
5930
5931
5932
5933
5934 ctx->ctx_saved_psr_up = psr & IA64_PSR_UP;
5935}
5936
5937static void
5938pfm_lazy_save_regs (struct task_struct *task)
5939{
5940 pfm_context_t *ctx;
5941 unsigned long flags;
5942
5943 { u64 psr = pfm_get_psr();
5944 BUG_ON(psr & IA64_PSR_UP);
5945 }
5946
5947 ctx = PFM_GET_CTX(task);
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958 PROTECT_CTX(ctx,flags);
5959
5960
5961
5962
5963
5964
5965
5966
5967 SET_PMU_OWNER(NULL, NULL);
5968
5969
5970
5971
5972 pfm_save_pmds(ctx->th_pmds, ctx->ctx_used_pmds[0]);
5973
5974
5975
5976
5977
5978
5979 ctx->th_pmcs[0] = ia64_get_pmc(0);
5980
5981
5982
5983
5984 if (ctx->th_pmcs[0] & ~0x1UL) pfm_unfreeze_pmu();
5985
5986
5987
5988
5989
5990
5991 UNPROTECT_CTX(ctx,flags);
5992}
5993#endif
5994
5995#ifdef CONFIG_SMP
5996
5997
5998
5999void
6000pfm_load_regs (struct task_struct *task)
6001{
6002 pfm_context_t *ctx;
6003 unsigned long pmc_mask = 0UL, pmd_mask = 0UL;
6004 unsigned long flags;
6005 u64 psr, psr_up;
6006 int need_irq_resend;
6007
6008 ctx = PFM_GET_CTX(task);
6009 if (unlikely(ctx == NULL)) return;
6010
6011 BUG_ON(GET_PMU_OWNER());
6012
6013
6014
6015
6016 if (unlikely((task->thread.flags & IA64_THREAD_PM_VALID) == 0)) return;
6017
6018
6019
6020
6021
6022
6023 flags = pfm_protect_ctx_ctxsw(ctx);
6024 psr = pfm_get_psr();
6025
6026 need_irq_resend = pmu_conf->flags & PFM_PMU_IRQ_RESEND;
6027
6028 BUG_ON(psr & (IA64_PSR_UP|IA64_PSR_PP));
6029 BUG_ON(psr & IA64_PSR_I);
6030
6031 if (unlikely(ctx->ctx_state == PFM_CTX_ZOMBIE)) {
6032 struct pt_regs *regs = task_pt_regs(task);
6033
6034 BUG_ON(ctx->ctx_smpl_hdr);
6035
6036 pfm_force_cleanup(ctx, regs);
6037
6038 pfm_unprotect_ctx_ctxsw(ctx, flags);
6039
6040
6041
6042
6043 pfm_context_free(ctx);
6044
6045 return;
6046 }
6047
6048
6049
6050
6051
6052 if (ctx->ctx_fl_using_dbreg) {
6053 pfm_restore_ibrs(ctx->ctx_ibrs, pmu_conf->num_ibrs);
6054 pfm_restore_dbrs(ctx->ctx_dbrs, pmu_conf->num_dbrs);
6055 }
6056
6057
6058
6059 psr_up = ctx->ctx_saved_psr_up;
6060
6061
6062
6063
6064
6065 if (GET_LAST_CPU(ctx) == smp_processor_id() && ctx->ctx_last_activation == GET_ACTIVATION()) {
6066
6067
6068
6069
6070 pmc_mask = ctx->ctx_reload_pmcs[0];
6071 pmd_mask = ctx->ctx_reload_pmds[0];
6072
6073 } else {
6074
6075
6076
6077
6078
6079
6080 pmd_mask = pfm_sysctl.fastctxsw ? ctx->ctx_used_pmds[0] : ctx->ctx_all_pmds[0];
6081
6082
6083
6084
6085
6086
6087
6088
6089 pmc_mask = ctx->ctx_all_pmcs[0];
6090 }
6091
6092
6093
6094
6095
6096
6097
6098 if (pmd_mask) pfm_restore_pmds(ctx->th_pmds, pmd_mask);
6099 if (pmc_mask) pfm_restore_pmcs(ctx->th_pmcs, pmc_mask);
6100
6101
6102
6103
6104
6105 if (unlikely(PMC0_HAS_OVFL(ctx->th_pmcs[0]))) {
6106
6107
6108
6109
6110 ia64_set_pmc(0, ctx->th_pmcs[0]);
6111 ia64_srlz_d();
6112 ctx->th_pmcs[0] = 0UL;
6113
6114
6115
6116
6117 if (need_irq_resend) ia64_resend_irq(IA64_PERFMON_VECTOR);
6118
6119 pfm_stats[smp_processor_id()].pfm_replay_ovfl_intr_count++;
6120 }
6121
6122
6123
6124
6125 ctx->ctx_reload_pmcs[0] = 0UL;
6126 ctx->ctx_reload_pmds[0] = 0UL;
6127
6128 SET_LAST_CPU(ctx, smp_processor_id());
6129
6130
6131
6132
6133 INC_ACTIVATION();
6134
6135
6136
6137 SET_ACTIVATION(ctx);
6138
6139
6140
6141
6142 SET_PMU_OWNER(task, ctx);
6143
6144
6145
6146
6147
6148
6149
6150 if (likely(psr_up)) pfm_set_psr_up();
6151
6152
6153
6154
6155 pfm_unprotect_ctx_ctxsw(ctx, flags);
6156}
6157#else
6158
6159
6160
6161
6162void
6163pfm_load_regs (struct task_struct *task)
6164{
6165 pfm_context_t *ctx;
6166 struct task_struct *owner;
6167 unsigned long pmd_mask, pmc_mask;
6168 u64 psr, psr_up;
6169 int need_irq_resend;
6170
6171 owner = GET_PMU_OWNER();
6172 ctx = PFM_GET_CTX(task);
6173 psr = pfm_get_psr();
6174
6175 BUG_ON(psr & (IA64_PSR_UP|IA64_PSR_PP));
6176 BUG_ON(psr & IA64_PSR_I);
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186 if (ctx->ctx_fl_using_dbreg) {
6187 pfm_restore_ibrs(ctx->ctx_ibrs, pmu_conf->num_ibrs);
6188 pfm_restore_dbrs(ctx->ctx_dbrs, pmu_conf->num_dbrs);
6189 }
6190
6191
6192
6193
6194 psr_up = ctx->ctx_saved_psr_up;
6195 need_irq_resend = pmu_conf->flags & PFM_PMU_IRQ_RESEND;
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205 if (likely(owner == task)) {
6206 if (likely(psr_up)) pfm_set_psr_up();
6207 return;
6208 }
6209
6210
6211
6212
6213
6214
6215
6216 if (owner) pfm_lazy_save_regs(owner);
6217
6218
6219
6220
6221
6222
6223
6224 pmd_mask = pfm_sysctl.fastctxsw ? ctx->ctx_used_pmds[0] : ctx->ctx_all_pmds[0];
6225
6226
6227
6228
6229
6230
6231
6232
6233 pmc_mask = ctx->ctx_all_pmcs[0];
6234
6235 pfm_restore_pmds(ctx->th_pmds, pmd_mask);
6236 pfm_restore_pmcs(ctx->th_pmcs, pmc_mask);
6237
6238
6239
6240
6241
6242 if (unlikely(PMC0_HAS_OVFL(ctx->th_pmcs[0]))) {
6243
6244
6245
6246
6247 ia64_set_pmc(0, ctx->th_pmcs[0]);
6248 ia64_srlz_d();
6249
6250 ctx->th_pmcs[0] = 0UL;
6251
6252
6253
6254
6255 if (need_irq_resend) ia64_resend_irq(IA64_PERFMON_VECTOR);
6256
6257 pfm_stats[smp_processor_id()].pfm_replay_ovfl_intr_count++;
6258 }
6259
6260
6261
6262
6263 SET_PMU_OWNER(task, ctx);
6264
6265
6266
6267
6268
6269
6270
6271 if (likely(psr_up)) pfm_set_psr_up();
6272}
6273#endif
6274
6275
6276
6277
6278static void
6279pfm_flush_pmds(struct task_struct *task, pfm_context_t *ctx)
6280{
6281 u64 pmc0;
6282 unsigned long mask2, val, pmd_val, ovfl_val;
6283 int i, can_access_pmu = 0;
6284 int is_self;
6285
6286
6287
6288
6289
6290 is_self = ctx->ctx_task == task ? 1 : 0;
6291
6292
6293
6294
6295
6296
6297
6298
6299 can_access_pmu = (GET_PMU_OWNER() == task) || (ctx->ctx_fl_system && ctx->ctx_cpu == smp_processor_id());
6300 if (can_access_pmu) {
6301
6302
6303
6304
6305
6306
6307
6308
6309 SET_PMU_OWNER(NULL, NULL);
6310 DPRINT(("releasing ownership\n"));
6311
6312
6313
6314
6315
6316
6317 ia64_srlz_d();
6318 pmc0 = ia64_get_pmc(0);
6319
6320
6321
6322
6323 pfm_unfreeze_pmu();
6324 } else {
6325 pmc0 = ctx->th_pmcs[0];
6326
6327
6328
6329 ctx->th_pmcs[0] = 0;
6330 }
6331 ovfl_val = pmu_conf->ovfl_val;
6332
6333
6334
6335
6336
6337
6338 mask2 = ctx->ctx_used_pmds[0];
6339
6340 DPRINT(("is_self=%d ovfl_val=0x%lx mask2=0x%lx\n", is_self, ovfl_val, mask2));
6341
6342 for (i = 0; mask2; i++, mask2>>=1) {
6343
6344
6345 if ((mask2 & 0x1) == 0) continue;
6346
6347
6348
6349
6350 val = pmd_val = can_access_pmu ? ia64_get_pmd(i) : ctx->th_pmds[i];
6351
6352 if (PMD_IS_COUNTING(i)) {
6353 DPRINT(("[%d] pmd[%d] ctx_pmd=0x%lx hw_pmd=0x%lx\n",
6354 task_pid_nr(task),
6355 i,
6356 ctx->ctx_pmds[i].val,
6357 val & ovfl_val));
6358
6359
6360
6361
6362 val = ctx->ctx_pmds[i].val + (val & ovfl_val);
6363
6364
6365
6366
6367
6368
6369 pmd_val = 0UL;
6370
6371
6372
6373
6374 if (pmc0 & (1UL << i)) {
6375 val += 1 + ovfl_val;
6376 DPRINT(("[%d] pmd[%d] overflowed\n", task_pid_nr(task), i));
6377 }
6378 }
6379
6380 DPRINT(("[%d] ctx_pmd[%d]=0x%lx pmd_val=0x%lx\n", task_pid_nr(task), i, val, pmd_val));
6381
6382 if (is_self) ctx->th_pmds[i] = pmd_val;
6383
6384 ctx->ctx_pmds[i].val = val;
6385 }
6386}
6387
6388static struct irqaction perfmon_irqaction = {
6389 .handler = pfm_interrupt_handler,
6390 .name = "perfmon"
6391};
6392
6393static void
6394pfm_alt_save_pmu_state(void *data)
6395{
6396 struct pt_regs *regs;
6397
6398 regs = task_pt_regs(current);
6399
6400 DPRINT(("called\n"));
6401
6402
6403
6404
6405
6406 pfm_clear_psr_up();
6407 pfm_clear_psr_pp();
6408 ia64_psr(regs)->pp = 0;
6409
6410
6411
6412
6413
6414 pfm_freeze_pmu();
6415
6416 ia64_srlz_d();
6417}
6418
6419void
6420pfm_alt_restore_pmu_state(void *data)
6421{
6422 struct pt_regs *regs;
6423
6424 regs = task_pt_regs(current);
6425
6426 DPRINT(("called\n"));
6427
6428
6429
6430
6431
6432 pfm_clear_psr_up();
6433 pfm_clear_psr_pp();
6434 ia64_psr(regs)->pp = 0;
6435
6436
6437
6438
6439 pfm_unfreeze_pmu();
6440
6441 ia64_srlz_d();
6442}
6443
6444int
6445pfm_install_alt_pmu_interrupt(pfm_intr_handler_desc_t *hdl)
6446{
6447 int ret, i;
6448 int reserve_cpu;
6449
6450
6451 if (hdl == NULL || hdl->handler == NULL) return -EINVAL;
6452
6453
6454 if (pfm_alt_intr_handler) return -EBUSY;
6455
6456
6457 if (!spin_trylock(&pfm_alt_install_check)) {
6458 return -EBUSY;
6459 }
6460
6461
6462 for_each_online_cpu(reserve_cpu) {
6463 ret = pfm_reserve_session(NULL, 1, reserve_cpu);
6464 if (ret) goto cleanup_reserve;
6465 }
6466
6467
6468 ret = on_each_cpu(pfm_alt_save_pmu_state, NULL, 1);
6469 if (ret) {
6470 DPRINT(("on_each_cpu() failed: %d\n", ret));
6471 goto cleanup_reserve;
6472 }
6473
6474
6475 pfm_alt_intr_handler = hdl;
6476
6477 spin_unlock(&pfm_alt_install_check);
6478
6479 return 0;
6480
6481cleanup_reserve:
6482 for_each_online_cpu(i) {
6483
6484 if (i >= reserve_cpu) break;
6485
6486 pfm_unreserve_session(NULL, 1, i);
6487 }
6488
6489 spin_unlock(&pfm_alt_install_check);
6490
6491 return ret;
6492}
6493EXPORT_SYMBOL_GPL(pfm_install_alt_pmu_interrupt);
6494
6495int
6496pfm_remove_alt_pmu_interrupt(pfm_intr_handler_desc_t *hdl)
6497{
6498 int i;
6499 int ret;
6500
6501 if (hdl == NULL) return -EINVAL;
6502
6503
6504 if (pfm_alt_intr_handler != hdl) return -EINVAL;
6505
6506
6507 if (!spin_trylock(&pfm_alt_install_check)) {
6508 return -EBUSY;
6509 }
6510
6511 pfm_alt_intr_handler = NULL;
6512
6513 ret = on_each_cpu(pfm_alt_restore_pmu_state, NULL, 1);
6514 if (ret) {
6515 DPRINT(("on_each_cpu() failed: %d\n", ret));
6516 }
6517
6518 for_each_online_cpu(i) {
6519 pfm_unreserve_session(NULL, 1, i);
6520 }
6521
6522 spin_unlock(&pfm_alt_install_check);
6523
6524 return 0;
6525}
6526EXPORT_SYMBOL_GPL(pfm_remove_alt_pmu_interrupt);
6527
6528
6529
6530
6531static int init_pfm_fs(void);
6532
6533static int __init
6534pfm_probe_pmu(void)
6535{
6536 pmu_config_t **p;
6537 int family;
6538
6539 family = local_cpu_data->family;
6540 p = pmu_confs;
6541
6542 while(*p) {
6543 if ((*p)->probe) {
6544 if ((*p)->probe() == 0) goto found;
6545 } else if ((*p)->pmu_family == family || (*p)->pmu_family == 0xff) {
6546 goto found;
6547 }
6548 p++;
6549 }
6550 return -1;
6551found:
6552 pmu_conf = *p;
6553 return 0;
6554}
6555
6556static const struct file_operations pfm_proc_fops = {
6557 .open = pfm_proc_open,
6558 .read = seq_read,
6559 .llseek = seq_lseek,
6560 .release = seq_release,
6561};
6562
6563int __init
6564pfm_init(void)
6565{
6566 unsigned int n, n_counters, i;
6567
6568 printk("perfmon: version %u.%u IRQ %u\n",
6569 PFM_VERSION_MAJ,
6570 PFM_VERSION_MIN,
6571 IA64_PERFMON_VECTOR);
6572
6573 if (pfm_probe_pmu()) {
6574 printk(KERN_INFO "perfmon: disabled, there is no support for processor family %d\n",
6575 local_cpu_data->family);
6576 return -ENODEV;
6577 }
6578
6579
6580
6581
6582
6583 n = 0;
6584 for (i=0; PMC_IS_LAST(i) == 0; i++) {
6585 if (PMC_IS_IMPL(i) == 0) continue;
6586 pmu_conf->impl_pmcs[i>>6] |= 1UL << (i&63);
6587 n++;
6588 }
6589 pmu_conf->num_pmcs = n;
6590
6591 n = 0; n_counters = 0;
6592 for (i=0; PMD_IS_LAST(i) == 0; i++) {
6593 if (PMD_IS_IMPL(i) == 0) continue;
6594 pmu_conf->impl_pmds[i>>6] |= 1UL << (i&63);
6595 n++;
6596 if (PMD_IS_COUNTING(i)) n_counters++;
6597 }
6598 pmu_conf->num_pmds = n;
6599 pmu_conf->num_counters = n_counters;
6600
6601
6602
6603
6604 if (pmu_conf->use_rr_dbregs) {
6605 if (pmu_conf->num_ibrs > IA64_NUM_DBG_REGS) {
6606 printk(KERN_INFO "perfmon: unsupported number of code debug registers (%u)\n", pmu_conf->num_ibrs);
6607 pmu_conf = NULL;
6608 return -1;
6609 }
6610 if (pmu_conf->num_dbrs > IA64_NUM_DBG_REGS) {
6611 printk(KERN_INFO "perfmon: unsupported number of data debug registers (%u)\n", pmu_conf->num_ibrs);
6612 pmu_conf = NULL;
6613 return -1;
6614 }
6615 }
6616
6617 printk("perfmon: %s PMU detected, %u PMCs, %u PMDs, %u counters (%lu bits)\n",
6618 pmu_conf->pmu_name,
6619 pmu_conf->num_pmcs,
6620 pmu_conf->num_pmds,
6621 pmu_conf->num_counters,
6622 ffz(pmu_conf->ovfl_val));
6623
6624
6625 if (pmu_conf->num_pmds >= PFM_NUM_PMD_REGS || pmu_conf->num_pmcs >= PFM_NUM_PMC_REGS) {
6626 printk(KERN_ERR "perfmon: not enough pmc/pmd, perfmon disabled\n");
6627 pmu_conf = NULL;
6628 return -1;
6629 }
6630
6631
6632
6633
6634 perfmon_dir = proc_create("perfmon", S_IRUGO, NULL, &pfm_proc_fops);
6635 if (perfmon_dir == NULL) {
6636 printk(KERN_ERR "perfmon: cannot create /proc entry, perfmon disabled\n");
6637 pmu_conf = NULL;
6638 return -1;
6639 }
6640
6641
6642
6643
6644 pfm_sysctl_header = register_sysctl_table(pfm_sysctl_root);
6645
6646
6647
6648
6649 spin_lock_init(&pfm_sessions.pfs_lock);
6650 spin_lock_init(&pfm_buffer_fmt_lock);
6651
6652 init_pfm_fs();
6653
6654 for(i=0; i < NR_CPUS; i++) pfm_stats[i].pfm_ovfl_intr_cycles_min = ~0UL;
6655
6656 return 0;
6657}
6658
6659__initcall(pfm_init);
6660
6661
6662
6663
6664void
6665pfm_init_percpu (void)
6666{
6667 static int first_time=1;
6668
6669
6670
6671
6672 pfm_clear_psr_pp();
6673 pfm_clear_psr_up();
6674
6675
6676
6677
6678 pfm_unfreeze_pmu();
6679
6680 if (first_time) {
6681 register_percpu_irq(IA64_PERFMON_VECTOR, &perfmon_irqaction);
6682 first_time=0;
6683 }
6684
6685 ia64_setreg(_IA64_REG_CR_PMV, IA64_PERFMON_VECTOR);
6686 ia64_srlz_d();
6687}
6688
6689
6690
6691
6692void
6693dump_pmu_state(const char *from)
6694{
6695 struct task_struct *task;
6696 struct pt_regs *regs;
6697 pfm_context_t *ctx;
6698 unsigned long psr, dcr, info, flags;
6699 int i, this_cpu;
6700
6701 local_irq_save(flags);
6702
6703 this_cpu = smp_processor_id();
6704 regs = task_pt_regs(current);
6705 info = PFM_CPUINFO_GET();
6706 dcr = ia64_getreg(_IA64_REG_CR_DCR);
6707
6708 if (info == 0 && ia64_psr(regs)->pp == 0 && (dcr & IA64_DCR_PP) == 0) {
6709 local_irq_restore(flags);
6710 return;
6711 }
6712
6713 printk("CPU%d from %s() current [%d] iip=0x%lx %s\n",
6714 this_cpu,
6715 from,
6716 task_pid_nr(current),
6717 regs->cr_iip,
6718 current->comm);
6719
6720 task = GET_PMU_OWNER();
6721 ctx = GET_PMU_CTX();
6722
6723 printk("->CPU%d owner [%d] ctx=%p\n", this_cpu, task ? task_pid_nr(task) : -1, ctx);
6724
6725 psr = pfm_get_psr();
6726
6727 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",
6728 this_cpu,
6729 ia64_get_pmc(0),
6730 psr & IA64_PSR_PP ? 1 : 0,
6731 psr & IA64_PSR_UP ? 1 : 0,
6732 dcr & IA64_DCR_PP ? 1 : 0,
6733 info,
6734 ia64_psr(regs)->up,
6735 ia64_psr(regs)->pp);
6736
6737 ia64_psr(regs)->up = 0;
6738 ia64_psr(regs)->pp = 0;
6739
6740 for (i=1; PMC_IS_LAST(i) == 0; i++) {
6741 if (PMC_IS_IMPL(i) == 0) continue;
6742 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]);
6743 }
6744
6745 for (i=1; PMD_IS_LAST(i) == 0; i++) {
6746 if (PMD_IS_IMPL(i) == 0) continue;
6747 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]);
6748 }
6749
6750 if (ctx) {
6751 printk("->CPU%d ctx_state=%d vaddr=%p addr=%p fd=%d ctx_task=[%d] saved_psr_up=0x%lx\n",
6752 this_cpu,
6753 ctx->ctx_state,
6754 ctx->ctx_smpl_vaddr,
6755 ctx->ctx_smpl_hdr,
6756 ctx->ctx_msgq_head,
6757 ctx->ctx_msgq_tail,
6758 ctx->ctx_saved_psr_up);
6759 }
6760 local_irq_restore(flags);
6761}
6762
6763
6764
6765
6766void
6767pfm_inherit(struct task_struct *task, struct pt_regs *regs)
6768{
6769 struct thread_struct *thread;
6770
6771 DPRINT(("perfmon: pfm_inherit clearing state for [%d]\n", task_pid_nr(task)));
6772
6773 thread = &task->thread;
6774
6775
6776
6777
6778 thread->pfm_context = NULL;
6779
6780 PFM_SET_WORK_PENDING(task, 0);
6781
6782
6783
6784
6785}
6786#else
6787asmlinkage long
6788sys_perfmonctl (int fd, int cmd, void *arg, int count)
6789{
6790 return -ENOSYS;
6791}
6792#endif
6793