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-rw-r--r--arch/csky/kernel/perf_callchain.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/arch/csky/kernel/perf_callchain.c b/arch/csky/kernel/perf_callchain.c
new file mode 100644
index 000000000..1612f4354
--- /dev/null
+++ b/arch/csky/kernel/perf_callchain.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/perf_event.h>
+#include <linux/uaccess.h>
+
+/* Kernel callchain */
+struct stackframe {
+ unsigned long fp;
+ unsigned long lr;
+};
+
+static int unwind_frame_kernel(struct stackframe *frame)
+{
+ unsigned long low = (unsigned long)task_stack_page(current);
+ unsigned long high = low + THREAD_SIZE;
+
+ if (unlikely(frame->fp < low || frame->fp > high))
+ return -EPERM;
+
+ if (kstack_end((void *)frame->fp) || frame->fp & 0x3)
+ return -EPERM;
+
+ *frame = *(struct stackframe *)frame->fp;
+
+ if (__kernel_text_address(frame->lr)) {
+ int graph = 0;
+
+ frame->lr = ftrace_graph_ret_addr(NULL, &graph, frame->lr,
+ NULL);
+ }
+ return 0;
+}
+
+static void notrace walk_stackframe(struct stackframe *fr,
+ struct perf_callchain_entry_ctx *entry)
+{
+ do {
+ perf_callchain_store(entry, fr->lr);
+ } while (unwind_frame_kernel(fr) >= 0);
+}
+
+/*
+ * Get the return address for a single stackframe and return a pointer to the
+ * next frame tail.
+ */
+static unsigned long user_backtrace(struct perf_callchain_entry_ctx *entry,
+ unsigned long fp, unsigned long reg_lr)
+{
+ struct stackframe buftail;
+ unsigned long lr = 0;
+ unsigned long __user *user_frame_tail = (unsigned long __user *)fp;
+
+ /* Check accessibility of one struct frame_tail beyond */
+ if (!access_ok(user_frame_tail, sizeof(buftail)))
+ return 0;
+ if (__copy_from_user_inatomic(&buftail, user_frame_tail,
+ sizeof(buftail)))
+ return 0;
+
+ if (reg_lr != 0)
+ lr = reg_lr;
+ else
+ lr = buftail.lr;
+
+ fp = buftail.fp;
+ perf_callchain_store(entry, lr);
+
+ return fp;
+}
+
+/*
+ * This will be called when the target is in user mode
+ * This function will only be called when we use
+ * "PERF_SAMPLE_CALLCHAIN" in
+ * kernel/events/core.c:perf_prepare_sample()
+ *
+ * How to trigger perf_callchain_[user/kernel] :
+ * $ perf record -e cpu-clock --call-graph fp ./program
+ * $ perf report --call-graph
+ *
+ * On C-SKY platform, the program being sampled and the C library
+ * need to be compiled with * -mbacktrace, otherwise the user
+ * stack will not contain function frame.
+ */
+void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
+ struct pt_regs *regs)
+{
+ unsigned long fp = 0;
+
+ fp = regs->regs[4];
+ perf_callchain_store(entry, regs->pc);
+
+ /*
+ * While backtrace from leaf function, lr is normally
+ * not saved inside frame on C-SKY, so get lr from pt_regs
+ * at the sample point. However, lr value can be incorrect if
+ * lr is used as temp register
+ */
+ fp = user_backtrace(entry, fp, regs->lr);
+
+ while (fp && !(fp & 0x3) && entry->nr < entry->max_stack)
+ fp = user_backtrace(entry, fp, 0);
+}
+
+void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
+ struct pt_regs *regs)
+{
+ struct stackframe fr;
+
+ fr.fp = regs->regs[4];
+ fr.lr = regs->lr;
+ walk_stackframe(&fr, entry);
+}