MIPS: Loongson-3: Add oprofile support

Loongson-3 has two groups of performance counters, they are 4 sub-
registers of CP0's REG25. This patch add oprofile support.

REG25, sel 0: Perf Control of group 0;
REG25, sel 1: Perf Counter of group 0;
REG25, sel 2: Perf Control of group 1;
REG25, sel 3: Perf Counter of group 1.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/8328/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/mips/oprofile/common.c b/arch/mips/oprofile/common.c
index e74732449478..feb987981f55 100644
--- a/arch/mips/oprofile/common.c
+++ b/arch/mips/oprofile/common.c
@@ -18,6 +18,7 @@
 
 extern struct op_mips_model op_model_mipsxx_ops __weak;
 extern struct op_mips_model op_model_loongson2_ops __weak;
+extern struct op_mips_model op_model_loongson3_ops __weak;
 
 static struct op_mips_model *model;
 
@@ -104,6 +105,9 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
         case CPU_LOONGSON2:
                 lmodel = &op_model_loongson2_ops;
                 break;
+        case CPU_LOONGSON3:
+                lmodel = &op_model_loongson3_ops;
+                break;
         };
 
         if (!lmodel)