MIPS: Tracing: Reduce the overhead of dynamic Function Tracer

With the help of uasm this patch encodes the instructions of the dynamic
function tracer in ftrace_dyn_arch_init() when initializing it.

As a result we can remove the dynamic encoding of instructions in
ftrace_make_nop()/call(), ftrace_enable_ftrace_graph_caller() and remove
the macro jump_insn_encode() and at last this reduce the overhead of
dynamic Function Tracer.  This also is cleaner.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips <linux-mips@linux-mips.org>
Cc: David Daney <david.s.daney@gmail.com>
Patchwork: http://patchwork.linux-mips.org/patch/1230/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 49 insertions, 44 deletions

diff --git a/arch/mips/kernel/ftrace.c b/arch/mips/kernel/ftrace.c
index b1b8fec2432f..c4042cad836e 100644
--- a/arch/mips/kernel/ftrace.c
+++ b/arch/mips/kernel/ftrace.c
@@ -2,7 +2,7 @@
  * Code for replacing ftrace calls with jumps.
  *
  * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
- * Copyright (C) 2009 DSLab, Lanzhou University, China
+ * Copyright (C) 2009, 2010 DSLab, Lanzhou University, China
  * Author: Wu Zhangjin <wuzhangjin@gmail.com>
  *
  * Thanks goes to Steven Rostedt for writing the original x86 version.
@@ -12,21 +12,46 @@
 #include <linux/init.h>
 #include <linux/ftrace.h>
 
-#include <asm/cacheflush.h>
 #include <asm/asm.h>
 #include <asm/asm-offsets.h>
+#include <asm/cacheflush.h>
+#include <asm/uasm.h>
 
 #ifdef CONFIG_DYNAMIC_FTRACE
 
 #define JAL 0x0c000000          /* jump & link: ip --> ra, jump to target */
 #define ADDR_MASK 0x03ffffff    /*  op_code|addr : 31...26|25 ....0 */
-#define jump_insn_encode(op_code, addr) \
-        ((unsigned int)((op_code) | (((addr) >> 2) & ADDR_MASK)))
 
 #define INSN_B_1F_4 0x10000004  /* b 1f; offset = 4 */
 #define INSN_B_1F_5 0x10000005  /* b 1f; offset = 5 */
 #define INSN_NOP 0x00000000     /* nop */
-#define INSN_JAL(addr)  jump_insn_encode(JAL, addr)
+#define INSN_JAL(addr)  \
+        ((unsigned int)(JAL | (((addr) >> 2) & ADDR_MASK)))
+
+static unsigned int insn_jal_ftrace_caller __read_mostly;
+static unsigned int insn_lui_v1_hi16_mcount __read_mostly;
+static unsigned int insn_j_ftrace_graph_caller __maybe_unused __read_mostly;
+
+static inline void ftrace_dyn_arch_init_insns(void)
+{
+        u32 *buf;
+        unsigned int v1;
+
+        /* lui v1, hi16_mcount */
+        v1 = 3;
+        buf = (u32 *)&insn_lui_v1_hi16_mcount;
+        UASM_i_LA_mostly(&buf, v1, MCOUNT_ADDR);
+
+        /* jal (ftrace_caller + 8), jump over the first two instruction */
+        buf = (u32 *)&insn_jal_ftrace_caller;
+        uasm_i_jal(&buf, (FTRACE_ADDR + 8));
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+        /* j ftrace_graph_caller */
+        buf = (u32 *)&insn_j_ftrace_graph_caller;
+        uasm_i_j(&buf, (unsigned long)ftrace_graph_caller);
+#endif
+}
 
 static int ftrace_modify_code(unsigned long ip, unsigned int new_code)
 {
@@ -43,30 +68,20 @@ static int ftrace_modify_code(unsigned long ip, unsigned int new_code)
         return 0;
 }
 
-static int lui_v1;
-static int jal_mcount;
-
 int ftrace_make_nop(struct module *mod,
                     struct dyn_ftrace *rec, unsigned long addr)
 {
         unsigned int new;
-        int faulted;
         unsigned long ip = rec->ip;
 
-        /* We have compiled module with -mlong-calls, but compiled the kernel
-         * without it, we need to cope with them respectively. */
+        /*
+         * We have compiled module with -mlong-calls, but compiled the kernel
+         * without it, we need to cope with them respectively.
+         */
         if (ip & 0x40000000) {
-                /* record it for ftrace_make_call */
-                if (lui_v1 == 0) {
-                        /* lui_v1 = *(unsigned int *)ip; */
-                        safe_load_code(lui_v1, ip, faulted);
-
-                        if (unlikely(faulted))
-                                return -EFAULT;
-                }
-
 #if defined(KBUILD_MCOUNT_RA_ADDRESS) && defined(CONFIG_32BIT)
-                /* lui v1, hi_16bit_of_mcount        --> b 1f (0x10000005)
+                /*
+                 * lui v1, hi_16bit_of_mcount        --> b 1f (0x10000005)
                  * addiu v1, v1, low_16bit_of_mcount
                  * move at, ra
                  * move $12, ra_address
@@ -76,7 +91,8 @@ int ftrace_make_nop(struct module *mod,
                  */
                 new = INSN_B_1F_5;
 #else
-                /* lui v1, hi_16bit_of_mcount        --> b 1f (0x10000004)
+                /*
+                 * lui v1, hi_16bit_of_mcount        --> b 1f (0x10000004)
                  * addiu v1, v1, low_16bit_of_mcount
                  * move at, ra
                  * jalr v1
@@ -86,36 +102,22 @@ int ftrace_make_nop(struct module *mod,
                 new = INSN_B_1F_4;
 #endif
         } else {
-                /* record/calculate it for ftrace_make_call */
-                if (jal_mcount == 0) {
-                        /* We can record it directly like this:
-                         *     jal_mcount = *(unsigned int *)ip;
-                         * Herein, jump over the first two nop instructions */
-                        jal_mcount = INSN_JAL(MCOUNT_ADDR + 8);
-                }
-
-                /* move at, ra
-                 * jalr v1              --> nop
+                /*
+                 * move at, ra
+                 * jal _mcount          --> nop
                  */
                 new = INSN_NOP;
         }
         return ftrace_modify_code(ip, new);
 }
 
-static int modified;    /* initialized as 0 by default */
-
 int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
 {
         unsigned int new;
         unsigned long ip = rec->ip;
 
-        /* We just need to remove the "b ftrace_stub" at the fist time! */
-        if (modified == 0) {
-                modified = 1;
-                ftrace_modify_code(addr, INSN_NOP);
-        }
         /* ip, module: 0xc0000000, kernel: 0x80000000 */
-        new = (ip & 0x40000000) ? lui_v1 : jal_mcount;
+        new = (ip & 0x40000000) ? insn_lui_v1_hi16_mcount : insn_jal_ftrace_caller;
 
         return ftrace_modify_code(ip, new);
 }
@@ -133,6 +135,12 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
 
 int __init ftrace_dyn_arch_init(void *data)
 {
+        /* Encode the instructions when booting */
+        ftrace_dyn_arch_init_insns();
+
+        /* Remove "b ftrace_stub" to ensure ftrace_caller() is executed */
+        ftrace_modify_code(MCOUNT_ADDR, INSN_NOP);
+
         /* The return code is retured via data */
         *(unsigned long *)data = 0;
 
@@ -145,15 +153,12 @@ int __init ftrace_dyn_arch_init(void *data)
 #ifdef CONFIG_DYNAMIC_FTRACE
 
 extern void ftrace_graph_call(void);
-#define JMP     0x08000000      /* jump to target directly */
-#define CALL_FTRACE_GRAPH_CALLER \
-        jump_insn_encode(JMP, (unsigned long)(&ftrace_graph_caller))
 #define FTRACE_GRAPH_CALL_IP    ((unsigned long)(&ftrace_graph_call))
 
 int ftrace_enable_ftrace_graph_caller(void)
 {
         return ftrace_modify_code(FTRACE_GRAPH_CALL_IP,
-                                  CALL_FTRACE_GRAPH_CALLER);
+                        insn_j_ftrace_graph_caller);
 }
 
 int ftrace_disable_ftrace_graph_caller(void)