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