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MIPS: Loongson: Add oprofile support

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This kernel support is needed by the user-space tool:oprofile to profile
linux kernel or applications via loongson2 performance counters. you can
enable this driver via CONFIG_OPROFILE = y or m.

On Loongson2 there are two performance counters, each one can count 16
events respectively. when anyone of the performance counter overflows, an
interrupt will be generated and is routed to the IRQ MIPS_CPU_IRQ_BASE + 6.

Signed-off-by: Yanhua <yanh@lemote.com>
Signed-off-by: Wu Zhangjin <wuzj@lemote.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Wu Zhangjin
2009-07-02 23:25:46 +08:00
committed by Ralf Baechle
parent 92d1b63dba
commit 67b35e5d01
5 changed files with 187 additions and 0 deletions
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4
arch/mips/oprofile/common.c
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@ -16,6 +16,7 @@
extern struct op_mips_model op_model_mipsxx_ops __attribute__((weak));
extern struct op_mips_model op_model_rm9000_ops __attribute__((weak));
extern struct op_mips_model op_model_loongson2_ops __attribute__((weak));
static struct op_mips_model *model;
@ -93,6 +94,9 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
case CPU_RM9000:
lmodel = &op_model_rm9000_ops;
break;
case CPU_LOONGSON2:
lmodel = &op_model_loongson2_ops;
break;
};
if (!lmodel)