Merge patch series "riscv: stacktrace: Add USER_STACKTRACE support"

Jinjie Ruan <ruanjinjie@huawei.com> says:

Add RISC-V USER_STACKTRACE support, and fix the fp alignment bug
in perf_callchain_user() by the way as Björn pointed out.

* b4-shazam-merge:
  riscv: stacktrace: Add USER_STACKTRACE support
  riscv: Fix fp alignment bug in perf_callchain_user()

Link: https://lore.kernel.org/r/20240708032847.2998158-1-ruanjinjie@huawei.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/Kconfig

@@ -201,6 +201,7 @@ config RISCV
 	select THREAD_INFO_IN_TASK
 	select TRACE_IRQFLAGS_SUPPORT
 	select UACCESS_MEMCPY if !MMU
+	select USER_STACKTRACE_SUPPORT
 	select ZONE_DMA32 if 64BIT
 
 config CLANG_SUPPORTS_DYNAMIC_FTRACE

arch/riscv/kernel/perf_callchain.c

@@ -6,37 +6,9 @@
 
 #include <asm/stacktrace.h>
 
-/*
- * 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_ra)
+static bool fill_callchain(void *entry, unsigned long pc)
 {
-	struct stackframe buftail;
-	unsigned long ra = 0;
-	unsigned long __user *user_frame_tail =
-		(unsigned long __user *)(fp - sizeof(struct stackframe));
-
-	/* 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_ra != 0)
-		ra = reg_ra;
-	else
-		ra = buftail.ra;
-
-	fp = buftail.fp;
-	if (ra != 0)
-		perf_callchain_store(entry, ra);
-	else
-		return 0;
-
-	return fp;
+	return perf_callchain_store(entry, pc) == 0;
 }
 
 /*
@@ -56,19 +28,7 @@ static unsigned long user_backtrace(struct perf_callchain_entry_ctx *entry,
 void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
 			 struct pt_regs *regs)
 {
-	unsigned long fp = 0;
-
-	fp = regs->s0;
-	perf_callchain_store(entry, regs->epc);
-
-	fp = user_backtrace(entry, fp, regs->ra);
-	while (fp && !(fp & 0x3) && entry->nr < entry->max_stack)
-		fp = user_backtrace(entry, fp, 0);
-}
-
-static bool fill_callchain(void *entry, unsigned long pc)
-{
-	return perf_callchain_store(entry, pc) == 0;
+	arch_stack_walk_user(fill_callchain, entry, regs);
 }
 
 void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,

arch/riscv/kernel/stacktrace.c

@@ -162,3 +162,46 @@ noinline noinstr void arch_stack_walk(stack_trace_consume_fn consume_entry, void
 {
 	walk_stackframe(task, regs, consume_entry, cookie);
 }
+
+/*
+ * Get the return address for a single stackframe and return a pointer to the
+ * next frame tail.
+ */
+static unsigned long unwind_user_frame(stack_trace_consume_fn consume_entry,
+				       void *cookie, unsigned long fp,
+				       unsigned long reg_ra)
+{
+	struct stackframe buftail;
+	unsigned long ra = 0;
+	unsigned long __user *user_frame_tail =
+		(unsigned long __user *)(fp - sizeof(struct stackframe));
+
+	/* 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;
+
+	ra = reg_ra ? : buftail.ra;
+
+	fp = buftail.fp;
+	if (!ra || !consume_entry(cookie, ra))
+		return 0;
+
+	return fp;
+}
+
+void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie,
+			  const struct pt_regs *regs)
+{
+	unsigned long fp = 0;
+
+	fp = regs->s0;
+	if (!consume_entry(cookie, regs->epc))
+		return;
+
+	fp = unwind_user_frame(consume_entry, cookie, fp, regs->ra);
+	while (fp && !(fp & 0x7))
+		fp = unwind_user_frame(consume_entry, cookie, fp, 0);
+}