powerpc/perf: Fix ABIv2 kernel backtraces

ABIv2 kernels are failing to backtrace through the kernel. An example:

39.30%  readseek2_proce  [kernel.kallsyms]    [k] find_get_entry
            |
            --- find_get_entry
               __GI___libc_read

The problem is in valid_next_sp() where we check that the new stack
pointer is at least STACK_FRAME_OVERHEAD below the previous one.

ABIv1 has a minimum stack frame size of 112 bytes consisting of 48 bytes
and 64 bytes of parameter save area. ABIv2 changes that to 32 bytes
with no paramter save area.

STACK_FRAME_OVERHEAD is in theory the minimum stack frame size,
but we over 240 uses of it, some of which assume that it includes
space for the parameter area.

We need to work through all our stack defines and rationalise them
but let's fix perf now by creating STACK_FRAME_MIN_SIZE and using
in valid_next_sp(). This fixes the issue:

30.64%  readseek2_proce  [kernel.kallsyms]    [k] find_get_entry
            |
            --- find_get_entry
               pagecache_get_page
               generic_file_read_iter
               new_sync_read
               vfs_read
               sys_read
               syscall_exit
               __GI___libc_read

Cc: stable@vger.kernel.org # 3.16+
Reported-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Anton Blanchard <anton@samba.org>

diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
index 279b80f..c0c61fa 100644 (file)
--- a/arch/powerpc/include/asm/ptrace.h
+++ b/arch/powerpc/include/asm/ptrace.h
@@ -47,6 +47,12 @@
                                 STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE)
 #define STACK_FRAME_MARKER     12
 
+#if defined(_CALL_ELF) && _CALL_ELF == 2
+#define STACK_FRAME_MIN_SIZE   32
+#else
+#define STACK_FRAME_MIN_SIZE   STACK_FRAME_OVERHEAD
+#endif
+
 /* Size of dummy stack frame allocated when calling signal handler. */
 #define __SIGNAL_FRAMESIZE     128
 #define __SIGNAL_FRAMESIZE32   64
@@ -60,6 +66,7 @@
 #define STACK_FRAME_REGS_MARKER        ASM_CONST(0x72656773)
 #define STACK_INT_FRAME_SIZE   (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
 #define STACK_FRAME_MARKER     2
+#define STACK_FRAME_MIN_SIZE   STACK_FRAME_OVERHEAD
 
 /* Size of stack frame allocated when calling signal handler. */
 #define __SIGNAL_FRAMESIZE     64

diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c
index 74d1e78..2396dda 100644 (file)
--- a/arch/powerpc/perf/callchain.c
+++ b/arch/powerpc/perf/callchain.c
@@ -35,7 +35,7 @@ static int valid_next_sp(unsigned long sp, unsigned long prev_sp)
                return 0;               /* must be 16-byte aligned */
        if (!validate_sp(sp, current, STACK_FRAME_OVERHEAD))
                return 0;
-       if (sp >= prev_sp + STACK_FRAME_OVERHEAD)
+       if (sp >= prev_sp + STACK_FRAME_MIN_SIZE)
                return 1;
        /*
         * sp could decrease when we jump off an interrupt stack