diff options
| -rw-r--r-- | kernel/trace/Kconfig | 4 | ||||
| -rw-r--r-- | kernel/trace/Makefile | 2 | ||||
| -rw-r--r-- | kernel/trace/trace.c | 2 | ||||
| -rw-r--r-- | kernel/trace/trace.h | 14 | ||||
| -rw-r--r-- | kernel/trace/trace_hw_branches.c (renamed from kernel/trace/trace_bts.c) | 163 |
5 files changed, 56 insertions, 129 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index bde6f03512d..d8bae6f4219 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -251,9 +251,9 @@ config STACK_TRACER Say N if unsure. -config BTS_TRACER +config HW_BRANCH_TRACER depends on HAVE_HW_BRANCH_TRACER - bool "Trace branches" + bool "Trace hw branches" select TRACING help This tracer records all branches on the system in a circular diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile index 62dc561b667..349d5a93653 100644 --- a/kernel/trace/Makefile +++ b/kernel/trace/Makefile @@ -31,7 +31,7 @@ obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o obj-$(CONFIG_BOOT_TRACER) += trace_boot.o obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o -obj-$(CONFIG_BTS_TRACER) += trace_bts.o +obj-$(CONFIG_HW_BRANCH_TRACER) += trace_hw_branches.o obj-$(CONFIG_POWER_TRACER) += trace_power.o libftrace-y := ftrace.o diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 8ebe0070c47..639344a4d3a 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2425,7 +2425,7 @@ __tracing_open(struct inode *inode, struct file *file, int *ret) /* Notify the tracer early; before we stop tracing. */ if (iter->trace && iter->trace->open) - iter->trace->open(iter); + iter->trace->open(iter); /* Annotate start of buffers if we had overruns */ if (ring_buffer_overruns(iter->tr->buffer)) diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 5ac697065a4..f07c246dd73 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -28,7 +28,7 @@ enum trace_type { TRACE_GRAPH_RET, TRACE_GRAPH_ENT, TRACE_USER_STACK, - TRACE_BTS, + TRACE_HW_BRANCHES, TRACE_POWER, __TRACE_LAST_TYPE @@ -159,10 +159,10 @@ struct trace_branch { char correct; }; -struct bts_entry { +struct hw_branch_entry { struct trace_entry ent; - unsigned long from; - unsigned long to; + u64 from; + u64 to; }; struct trace_power { @@ -278,7 +278,7 @@ extern void __ftrace_bad_type(void); TRACE_GRAPH_ENT); \ IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ TRACE_GRAPH_RET); \ - IF_ASSIGN(var, ent, struct bts_entry, TRACE_BTS);\ + IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\ IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \ __ftrace_bad_type(); \ } while (0) @@ -414,9 +414,7 @@ void trace_function(struct trace_array *tr, void trace_graph_return(struct ftrace_graph_ret *trace); int trace_graph_entry(struct ftrace_graph_ent *trace); -void trace_bts(struct trace_array *tr, - unsigned long from, - unsigned long to); +void trace_hw_branch(struct trace_array *tr, u64 from, u64 to); void tracing_start_cmdline_record(void); void tracing_stop_cmdline_record(void); diff --git a/kernel/trace/trace_bts.c b/kernel/trace/trace_hw_branches.c index 23b76e4690e..ee29e012aa9 100644 --- a/kernel/trace/trace_bts.c +++ b/kernel/trace/trace_hw_branches.c @@ -1,5 +1,5 @@ /* - * BTS tracer + * h/w branch tracer for x86 based on bts * * Copyright (C) 2008 Markus Metzger <markus.t.metzger@gmail.com> * @@ -25,68 +25,6 @@ static DEFINE_PER_CPU(unsigned char[SIZEOF_BTS], buffer); #define this_buffer per_cpu(buffer, smp_processor_id()) -/* - * Information to interpret a BTS record. - * This will go into an in-kernel BTS interface. - */ -static unsigned char sizeof_field; -static unsigned long debugctl_mask; - -#define sizeof_bts (3 * sizeof_field) - -static void bts_trace_cpuinit(struct cpuinfo_x86 *c) -{ - switch (c->x86) { - case 0x6: - switch (c->x86_model) { - case 0x0 ... 0xC: - break; - case 0xD: - case 0xE: /* Pentium M */ - sizeof_field = sizeof(long); - debugctl_mask = (1<<6)|(1<<7); - break; - default: - sizeof_field = 8; - debugctl_mask = (1<<6)|(1<<7); - break; - } - break; - case 0xF: - switch (c->x86_model) { - case 0x0: - case 0x1: - case 0x2: /* Netburst */ - sizeof_field = sizeof(long); - debugctl_mask = (1<<2)|(1<<3); - break; - default: - /* sorry, don't know about them */ - break; - } - break; - default: - /* sorry, don't know about them */ - break; - } -} - -static inline void bts_enable(void) -{ - unsigned long debugctl; - - rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctl); - wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctl | debugctl_mask); -} - -static inline void bts_disable(void) -{ - unsigned long debugctl; - - rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctl); - wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctl & ~debugctl_mask); -} - static void bts_trace_reset(struct trace_array *tr) { int cpu; @@ -99,15 +37,17 @@ static void bts_trace_reset(struct trace_array *tr) static void bts_trace_start_cpu(void *arg) { + if (this_tracer) + ds_release_bts(this_tracer); + this_tracer = ds_request_bts(/* task = */ NULL, this_buffer, SIZEOF_BTS, - /* ovfl = */ NULL, /* th = */ (size_t)-1); + /* ovfl = */ NULL, /* th = */ (size_t)-1, + BTS_KERNEL); if (IS_ERR(this_tracer)) { this_tracer = NULL; return; } - - bts_enable(); } static void bts_trace_start(struct trace_array *tr) @@ -123,8 +63,6 @@ static void bts_trace_start(struct trace_array *tr) static void bts_trace_stop_cpu(void *arg) { if (this_tracer) { - bts_disable(); - ds_release_bts(this_tracer); this_tracer = NULL; } @@ -140,7 +78,6 @@ static void bts_trace_stop(struct trace_array *tr) static int bts_trace_init(struct trace_array *tr) { - bts_trace_cpuinit(&boot_cpu_data); bts_trace_reset(tr); bts_trace_start(tr); @@ -149,47 +86,37 @@ static int bts_trace_init(struct trace_array *tr) static void bts_trace_print_header(struct seq_file *m) { -#ifdef __i386__ - seq_puts(m, "# CPU# FROM TO FUNCTION\n"); - seq_puts(m, "# | | | |\n"); -#else seq_puts(m, "# CPU# FROM TO FUNCTION\n"); seq_puts(m, "# | | | |\n"); -#endif } static enum print_line_t bts_trace_print_line(struct trace_iterator *iter) { struct trace_entry *entry = iter->ent; struct trace_seq *seq = &iter->seq; - struct bts_entry *it; + struct hw_branch_entry *it; trace_assign_type(it, entry); - if (entry->type == TRACE_BTS) { - int ret; -#ifdef CONFIG_KALLSYMS - char function[KSYM_SYMBOL_LEN]; - sprint_symbol(function, it->from); -#else - char *function = "<unknown>"; -#endif - - ret = trace_seq_printf(seq, "%4d 0x%lx -> 0x%lx [%s]\n", - entry->cpu, it->from, it->to, function); - if (!ret) - return TRACE_TYPE_PARTIAL_LINE;; - return TRACE_TYPE_HANDLED; + if (entry->type == TRACE_HW_BRANCHES) { + if (trace_seq_printf(seq, "%4d ", entry->cpu) && + trace_seq_printf(seq, "0x%016llx -> 0x%016llx ", + it->from, it->to) && + (!it->from || + seq_print_ip_sym(seq, it->from, /* sym_flags = */ 0)) && + trace_seq_printf(seq, "\n")) + return TRACE_TYPE_HANDLED; + return TRACE_TYPE_PARTIAL_LINE;; } return TRACE_TYPE_UNHANDLED; } -void trace_bts(struct trace_array *tr, unsigned long from, unsigned long to) +void trace_hw_branch(struct trace_array *tr, u64 from, u64 to) { struct ring_buffer_event *event; - struct bts_entry *entry; + struct hw_branch_entry *entry; unsigned long irq; event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), &irq); @@ -197,56 +124,58 @@ void trace_bts(struct trace_array *tr, unsigned long from, unsigned long to) return; entry = ring_buffer_event_data(event); tracing_generic_entry_update(&entry->ent, 0, from); - entry->ent.type = TRACE_BTS; + entry->ent.type = TRACE_HW_BRANCHES; entry->ent.cpu = smp_processor_id(); entry->from = from; entry->to = to; ring_buffer_unlock_commit(tr->buffer, event, irq); } -static void trace_bts_at(struct trace_array *tr, size_t index) +static void trace_bts_at(struct trace_array *tr, + const struct bts_trace *trace, void *at) { - const void *raw = NULL; - unsigned long from, to; - int err; + struct bts_struct bts; + int err = 0; - err = ds_access_bts(this_tracer, index, &raw); - if (err < 0) + WARN_ON_ONCE(!trace->read); + if (!trace->read) return; - from = *(const unsigned long *)raw; - to = *(const unsigned long *)((const char *)raw + sizeof_field); + err = trace->read(this_tracer, at, &bts); + if (err < 0) + return; - trace_bts(tr, from, to); + switch (bts.qualifier) { + case BTS_BRANCH: + trace_hw_branch(tr, bts.variant.lbr.from, bts.variant.lbr.to); + break; + } } static void trace_bts_cpu(void *arg) { struct trace_array *tr = (struct trace_array *) arg; - size_t index = 0, end = 0, i; - int err; + const struct bts_trace *trace; + unsigned char *at; if (!this_tracer) return; - bts_disable(); - - err = ds_get_bts_index(this_tracer, &index); - if (err < 0) - goto out; - - err = ds_get_bts_end(this_tracer, &end); - if (err < 0) + ds_suspend_bts(this_tracer); + trace = ds_read_bts(this_tracer); + if (!trace) goto out; - for (i = index; i < end; i++) - trace_bts_at(tr, i); + for (at = trace->ds.top; (void *)at < trace->ds.end; + at += trace->ds.size) + trace_bts_at(tr, trace, at); - for (i = 0; i < index; i++) - trace_bts_at(tr, i); + for (at = trace->ds.begin; (void *)at < trace->ds.top; + at += trace->ds.size) + trace_bts_at(tr, trace, at); out: - bts_enable(); + ds_resume_bts(this_tracer); } static void trace_bts_prepare(struct trace_iterator *iter) @@ -259,7 +188,7 @@ static void trace_bts_prepare(struct trace_iterator *iter) struct tracer bts_tracer __read_mostly = { - .name = "bts", + .name = "hw-branch-tracer", .init = bts_trace_init, .reset = bts_trace_stop, .print_header = bts_trace_print_header, |