diff options
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/kernel/perf_event.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c index 181baeed4495..a6ad1e09e4be 100644 --- a/arch/arc/kernel/perf_event.c +++ b/arch/arc/kernel/perf_event.c @@ -16,6 +16,7 @@ #include <linux/perf_event.h> #include <linux/platform_device.h> #include <asm/arcregs.h> +#include <asm/stacktrace.h> struct arc_pmu { struct pmu pmu; @@ -25,6 +26,34 @@ struct arc_pmu { int ev_hw_idx[PERF_COUNT_ARC_HW_MAX]; }; +struct arc_callchain_trace { + int depth; + void *perf_stuff; +}; + +static int callchain_trace(unsigned int addr, void *data) +{ + struct arc_callchain_trace *ctrl = data; + struct perf_callchain_entry *entry = ctrl->perf_stuff; + perf_callchain_store(entry, addr); + + if (ctrl->depth++ < 3) + return 0; + + return -1; +} + +void +perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs) +{ + struct arc_callchain_trace ctrl = { + .depth = 0, + .perf_stuff = entry, + }; + + arc_unwind_core(NULL, regs, callchain_trace, &ctrl); +} + static struct arc_pmu *arc_pmu; /* read counter #idx; note that counter# != event# on ARC! */ |