x86, bts, ftrace: adapt the hw-branch-tracer to the ds.c interface
Impact: restructure code, cleanup Remove BTS bits from the hw-branch-tracer (renamed from bts-tracer) and use the ds interface. Signed-off-by: Markus Metzger <markut.t.metzger@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
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c2724775ce
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a93751cab7
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@ -251,9 +251,9 @@ config STACK_TRACER
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Say N if unsure.
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config BTS_TRACER
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config HW_BRANCH_TRACER
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depends on HAVE_HW_BRANCH_TRACER
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bool "Trace branches"
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bool "Trace hw branches"
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select TRACING
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help
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This tracer records all branches on the system in a circular
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@ -31,7 +31,7 @@ obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
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obj-$(CONFIG_BOOT_TRACER) += trace_boot.o
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obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
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obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
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obj-$(CONFIG_BTS_TRACER) += trace_bts.o
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obj-$(CONFIG_HW_BRANCH_TRACER) += trace_hw_branches.o
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obj-$(CONFIG_POWER_TRACER) += trace_power.o
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libftrace-y := ftrace.o
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@ -2425,7 +2425,7 @@ __tracing_open(struct inode *inode, struct file *file, int *ret)
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/* Notify the tracer early; before we stop tracing. */
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if (iter->trace && iter->trace->open)
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iter->trace->open(iter);
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iter->trace->open(iter);
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/* Annotate start of buffers if we had overruns */
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if (ring_buffer_overruns(iter->tr->buffer))
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@ -28,7 +28,7 @@ enum trace_type {
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TRACE_GRAPH_RET,
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TRACE_GRAPH_ENT,
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TRACE_USER_STACK,
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TRACE_BTS,
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TRACE_HW_BRANCHES,
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TRACE_POWER,
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__TRACE_LAST_TYPE
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@ -159,10 +159,10 @@ struct trace_branch {
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char correct;
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};
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struct bts_entry {
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struct hw_branch_entry {
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struct trace_entry ent;
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unsigned long from;
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unsigned long to;
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u64 from;
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u64 to;
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};
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struct trace_power {
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@ -278,7 +278,7 @@ extern void __ftrace_bad_type(void);
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TRACE_GRAPH_ENT); \
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IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
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TRACE_GRAPH_RET); \
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IF_ASSIGN(var, ent, struct bts_entry, TRACE_BTS);\
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IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
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IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
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__ftrace_bad_type(); \
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} while (0)
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@ -414,9 +414,7 @@ void trace_function(struct trace_array *tr,
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void trace_graph_return(struct ftrace_graph_ret *trace);
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int trace_graph_entry(struct ftrace_graph_ent *trace);
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void trace_bts(struct trace_array *tr,
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unsigned long from,
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unsigned long to);
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void trace_hw_branch(struct trace_array *tr, u64 from, u64 to);
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void tracing_start_cmdline_record(void);
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void tracing_stop_cmdline_record(void);
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@ -1,5 +1,5 @@
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/*
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* BTS tracer
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* h/w branch tracer for x86 based on bts
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*
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* Copyright (C) 2008 Markus Metzger <markus.t.metzger@gmail.com>
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*
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@ -25,68 +25,6 @@ static DEFINE_PER_CPU(unsigned char[SIZEOF_BTS], buffer);
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#define this_buffer per_cpu(buffer, smp_processor_id())
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/*
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* Information to interpret a BTS record.
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* This will go into an in-kernel BTS interface.
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*/
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static unsigned char sizeof_field;
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static unsigned long debugctl_mask;
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#define sizeof_bts (3 * sizeof_field)
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static void bts_trace_cpuinit(struct cpuinfo_x86 *c)
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{
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switch (c->x86) {
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case 0x6:
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switch (c->x86_model) {
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case 0x0 ... 0xC:
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break;
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case 0xD:
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case 0xE: /* Pentium M */
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sizeof_field = sizeof(long);
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debugctl_mask = (1<<6)|(1<<7);
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break;
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default:
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sizeof_field = 8;
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debugctl_mask = (1<<6)|(1<<7);
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break;
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}
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break;
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case 0xF:
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switch (c->x86_model) {
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case 0x0:
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case 0x1:
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case 0x2: /* Netburst */
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sizeof_field = sizeof(long);
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debugctl_mask = (1<<2)|(1<<3);
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break;
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default:
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/* sorry, don't know about them */
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break;
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}
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break;
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default:
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/* sorry, don't know about them */
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break;
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}
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}
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static inline void bts_enable(void)
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{
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unsigned long debugctl;
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rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctl);
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wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctl | debugctl_mask);
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}
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static inline void bts_disable(void)
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{
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unsigned long debugctl;
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rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctl);
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wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctl & ~debugctl_mask);
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}
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static void bts_trace_reset(struct trace_array *tr)
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{
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int cpu;
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@ -99,15 +37,17 @@ static void bts_trace_reset(struct trace_array *tr)
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static void bts_trace_start_cpu(void *arg)
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{
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if (this_tracer)
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ds_release_bts(this_tracer);
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this_tracer =
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ds_request_bts(/* task = */ NULL, this_buffer, SIZEOF_BTS,
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/* ovfl = */ NULL, /* th = */ (size_t)-1);
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/* ovfl = */ NULL, /* th = */ (size_t)-1,
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BTS_KERNEL);
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if (IS_ERR(this_tracer)) {
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this_tracer = NULL;
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return;
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}
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bts_enable();
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}
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static void bts_trace_start(struct trace_array *tr)
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@ -123,8 +63,6 @@ static void bts_trace_start(struct trace_array *tr)
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static void bts_trace_stop_cpu(void *arg)
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{
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if (this_tracer) {
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bts_disable();
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ds_release_bts(this_tracer);
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this_tracer = NULL;
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}
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@ -140,7 +78,6 @@ static void bts_trace_stop(struct trace_array *tr)
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static int bts_trace_init(struct trace_array *tr)
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{
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bts_trace_cpuinit(&boot_cpu_data);
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bts_trace_reset(tr);
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bts_trace_start(tr);
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@ -149,47 +86,37 @@ static int bts_trace_init(struct trace_array *tr)
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static void bts_trace_print_header(struct seq_file *m)
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{
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#ifdef __i386__
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seq_puts(m, "# CPU# FROM TO FUNCTION\n");
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seq_puts(m, "# | | | |\n");
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#else
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seq_puts(m,
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"# CPU# FROM TO FUNCTION\n");
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seq_puts(m,
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"# | | | |\n");
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#endif
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}
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static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
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{
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struct trace_entry *entry = iter->ent;
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struct trace_seq *seq = &iter->seq;
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struct bts_entry *it;
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struct hw_branch_entry *it;
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trace_assign_type(it, entry);
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if (entry->type == TRACE_BTS) {
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int ret;
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#ifdef CONFIG_KALLSYMS
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char function[KSYM_SYMBOL_LEN];
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sprint_symbol(function, it->from);
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#else
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char *function = "<unknown>";
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#endif
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ret = trace_seq_printf(seq, "%4d 0x%lx -> 0x%lx [%s]\n",
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entry->cpu, it->from, it->to, function);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;;
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return TRACE_TYPE_HANDLED;
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if (entry->type == TRACE_HW_BRANCHES) {
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if (trace_seq_printf(seq, "%4d ", entry->cpu) &&
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trace_seq_printf(seq, "0x%016llx -> 0x%016llx ",
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it->from, it->to) &&
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(!it->from ||
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seq_print_ip_sym(seq, it->from, /* sym_flags = */ 0)) &&
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trace_seq_printf(seq, "\n"))
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return TRACE_TYPE_HANDLED;
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return TRACE_TYPE_PARTIAL_LINE;;
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}
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return TRACE_TYPE_UNHANDLED;
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}
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void trace_bts(struct trace_array *tr, unsigned long from, unsigned long to)
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void trace_hw_branch(struct trace_array *tr, u64 from, u64 to)
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{
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struct ring_buffer_event *event;
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struct bts_entry *entry;
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struct hw_branch_entry *entry;
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unsigned long irq;
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event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), &irq);
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return;
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entry = ring_buffer_event_data(event);
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tracing_generic_entry_update(&entry->ent, 0, from);
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entry->ent.type = TRACE_BTS;
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entry->ent.type = TRACE_HW_BRANCHES;
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entry->ent.cpu = smp_processor_id();
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entry->from = from;
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entry->to = to;
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ring_buffer_unlock_commit(tr->buffer, event, irq);
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}
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static void trace_bts_at(struct trace_array *tr, size_t index)
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static void trace_bts_at(struct trace_array *tr,
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const struct bts_trace *trace, void *at)
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{
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const void *raw = NULL;
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unsigned long from, to;
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int err;
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struct bts_struct bts;
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int err = 0;
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err = ds_access_bts(this_tracer, index, &raw);
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WARN_ON_ONCE(!trace->read);
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if (!trace->read)
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return;
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err = trace->read(this_tracer, at, &bts);
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if (err < 0)
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return;
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from = *(const unsigned long *)raw;
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to = *(const unsigned long *)((const char *)raw + sizeof_field);
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trace_bts(tr, from, to);
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switch (bts.qualifier) {
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case BTS_BRANCH:
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trace_hw_branch(tr, bts.variant.lbr.from, bts.variant.lbr.to);
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break;
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}
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}
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static void trace_bts_cpu(void *arg)
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{
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struct trace_array *tr = (struct trace_array *) arg;
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size_t index = 0, end = 0, i;
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int err;
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const struct bts_trace *trace;
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unsigned char *at;
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if (!this_tracer)
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return;
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bts_disable();
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err = ds_get_bts_index(this_tracer, &index);
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if (err < 0)
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ds_suspend_bts(this_tracer);
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trace = ds_read_bts(this_tracer);
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if (!trace)
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goto out;
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err = ds_get_bts_end(this_tracer, &end);
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if (err < 0)
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goto out;
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for (at = trace->ds.top; (void *)at < trace->ds.end;
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at += trace->ds.size)
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trace_bts_at(tr, trace, at);
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for (i = index; i < end; i++)
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trace_bts_at(tr, i);
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for (i = 0; i < index; i++)
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trace_bts_at(tr, i);
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for (at = trace->ds.begin; (void *)at < trace->ds.top;
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at += trace->ds.size)
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trace_bts_at(tr, trace, at);
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out:
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bts_enable();
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ds_resume_bts(this_tracer);
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}
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static void trace_bts_prepare(struct trace_iterator *iter)
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@ -259,7 +188,7 @@ static void trace_bts_prepare(struct trace_iterator *iter)
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struct tracer bts_tracer __read_mostly =
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{
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.name = "bts",
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.name = "hw-branch-tracer",
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.init = bts_trace_init,
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.reset = bts_trace_stop,
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.print_header = bts_trace_print_header,
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