diff options
Diffstat (limited to 'arch/mips/oprofile/op_model_loongson2.c')
| -rw-r--r-- | arch/mips/oprofile/op_model_loongson2.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/arch/mips/oprofile/op_model_loongson2.c b/arch/mips/oprofile/op_model_loongson2.c new file mode 100644 index 000000000..b249ec0be --- /dev/null +++ b/arch/mips/oprofile/op_model_loongson2.c @@ -0,0 +1,161 @@ +/* + * Loongson2 performance counter driver for oprofile + * + * Copyright (C) 2009 Lemote Inc. + * Author: Yanhua <yanh@lemote.com> + * Author: Wu Zhangjin <wuzhangjin@gmail.com> + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/init.h> +#include <linux/oprofile.h> +#include <linux/interrupt.h> + +#include <loongson.h> /* LOONGSON2_PERFCNT_IRQ */ +#include "op_impl.h" + +#define LOONGSON2_CPU_TYPE "mips/loongson2" + +#define LOONGSON2_PERFCNT_OVERFLOW (1ULL << 31) + +#define LOONGSON2_PERFCTRL_EXL (1UL << 0) +#define LOONGSON2_PERFCTRL_KERNEL (1UL << 1) +#define LOONGSON2_PERFCTRL_SUPERVISOR (1UL << 2) +#define LOONGSON2_PERFCTRL_USER (1UL << 3) +#define LOONGSON2_PERFCTRL_ENABLE (1UL << 4) +#define LOONGSON2_PERFCTRL_EVENT(idx, event) \ + (((event) & 0x0f) << ((idx) ? 9 : 5)) + +#define read_c0_perfctrl() __read_64bit_c0_register($24, 0) +#define write_c0_perfctrl(val) __write_64bit_c0_register($24, 0, val) +#define read_c0_perfcnt() __read_64bit_c0_register($25, 0) +#define write_c0_perfcnt(val) __write_64bit_c0_register($25, 0, val) + +static struct loongson2_register_config { + unsigned int ctrl; + unsigned long long reset_counter1; + unsigned long long reset_counter2; + int cnt1_enabled, cnt2_enabled; +} reg; + +static char *oprofid = "LoongsonPerf"; +static irqreturn_t loongson2_perfcount_handler(int irq, void *dev_id); + +static void reset_counters(void *arg) +{ + write_c0_perfctrl(0); + write_c0_perfcnt(0); +} + +static void loongson2_reg_setup(struct op_counter_config *cfg) +{ + unsigned int ctrl = 0; + + reg.reset_counter1 = 0; + reg.reset_counter2 = 0; + + /* + * Compute the performance counter ctrl word. + * For now, count kernel and user mode. + */ + if (cfg[0].enabled) { + ctrl |= LOONGSON2_PERFCTRL_EVENT(0, cfg[0].event); + reg.reset_counter1 = 0x80000000ULL - cfg[0].count; + } + + if (cfg[1].enabled) { + ctrl |= LOONGSON2_PERFCTRL_EVENT(1, cfg[1].event); + reg.reset_counter2 = 0x80000000ULL - cfg[1].count; + } + + if (cfg[0].enabled || cfg[1].enabled) { + ctrl |= LOONGSON2_PERFCTRL_EXL | LOONGSON2_PERFCTRL_ENABLE; + if (cfg[0].kernel || cfg[1].kernel) + ctrl |= LOONGSON2_PERFCTRL_KERNEL; + if (cfg[0].user || cfg[1].user) + ctrl |= LOONGSON2_PERFCTRL_USER; + } + + reg.ctrl = ctrl; + + reg.cnt1_enabled = cfg[0].enabled; + reg.cnt2_enabled = cfg[1].enabled; +} + +static void loongson2_cpu_setup(void *args) +{ + write_c0_perfcnt((reg.reset_counter2 << 32) | reg.reset_counter1); +} + +static void loongson2_cpu_start(void *args) +{ + /* Start all counters on current CPU */ + if (reg.cnt1_enabled || reg.cnt2_enabled) + write_c0_perfctrl(reg.ctrl); +} + +static void loongson2_cpu_stop(void *args) +{ + /* Stop all counters on current CPU */ + write_c0_perfctrl(0); + memset(®, 0, sizeof(reg)); +} + +static irqreturn_t loongson2_perfcount_handler(int irq, void *dev_id) +{ + uint64_t counter, counter1, counter2; + struct pt_regs *regs = get_irq_regs(); + int enabled; + + /* Check whether the irq belongs to me */ + enabled = read_c0_perfctrl() & LOONGSON2_PERFCTRL_ENABLE; + if (!enabled) + return IRQ_NONE; + enabled = reg.cnt1_enabled | reg.cnt2_enabled; + if (!enabled) + return IRQ_NONE; + + counter = read_c0_perfcnt(); + counter1 = counter & 0xffffffff; + counter2 = counter >> 32; + + if (counter1 & LOONGSON2_PERFCNT_OVERFLOW) { + if (reg.cnt1_enabled) + oprofile_add_sample(regs, 0); + counter1 = reg.reset_counter1; + } + if (counter2 & LOONGSON2_PERFCNT_OVERFLOW) { + if (reg.cnt2_enabled) + oprofile_add_sample(regs, 1); + counter2 = reg.reset_counter2; + } + + write_c0_perfcnt((counter2 << 32) | counter1); + + return IRQ_HANDLED; +} + +static int __init loongson2_init(void) +{ + return request_irq(LOONGSON2_PERFCNT_IRQ, loongson2_perfcount_handler, + IRQF_SHARED, "Perfcounter", oprofid); +} + +static void loongson2_exit(void) +{ + reset_counters(NULL); + free_irq(LOONGSON2_PERFCNT_IRQ, oprofid); +} + +struct op_mips_model op_model_loongson2_ops = { + .reg_setup = loongson2_reg_setup, + .cpu_setup = loongson2_cpu_setup, + .init = loongson2_init, + .exit = loongson2_exit, + .cpu_start = loongson2_cpu_start, + .cpu_stop = loongson2_cpu_stop, + .cpu_type = LOONGSON2_CPU_TYPE, + .num_counters = 2 +}; |