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Diffstat (limited to '')
| -rw-r--r-- | arch/mips/oprofile/op_model_loongson3.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/arch/mips/oprofile/op_model_loongson3.c b/arch/mips/oprofile/op_model_loongson3.c new file mode 100644 index 000000000..436b1fc99 --- /dev/null +++ b/arch/mips/oprofile/op_model_loongson3.c @@ -0,0 +1,213 @@ +/* + * 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/cpu.h> +#include <linux/smp.h> +#include <linux/proc_fs.h> +#include <linux/oprofile.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/uaccess.h> +#include <irq.h> +#include <loongson.h> +#include "op_impl.h" + +#define LOONGSON3_PERFCNT_OVERFLOW (1ULL << 63) + +#define LOONGSON3_PERFCTRL_EXL (1UL << 0) +#define LOONGSON3_PERFCTRL_KERNEL (1UL << 1) +#define LOONGSON3_PERFCTRL_SUPERVISOR (1UL << 2) +#define LOONGSON3_PERFCTRL_USER (1UL << 3) +#define LOONGSON3_PERFCTRL_ENABLE (1UL << 4) +#define LOONGSON3_PERFCTRL_W (1UL << 30) +#define LOONGSON3_PERFCTRL_M (1UL << 31) +#define LOONGSON3_PERFCTRL_EVENT(idx, event) \ + (((event) & (idx ? 0x0f : 0x3f)) << 5) + +/* Loongson-3 PerfCount performance counter1 register */ +#define read_c0_perflo1() __read_64bit_c0_register($25, 0) +#define write_c0_perflo1(val) __write_64bit_c0_register($25, 0, val) +#define read_c0_perfhi1() __read_64bit_c0_register($25, 1) +#define write_c0_perfhi1(val) __write_64bit_c0_register($25, 1, val) + +/* Loongson-3 PerfCount performance counter2 register */ +#define read_c0_perflo2() __read_64bit_c0_register($25, 2) +#define write_c0_perflo2(val) __write_64bit_c0_register($25, 2, val) +#define read_c0_perfhi2() __read_64bit_c0_register($25, 3) +#define write_c0_perfhi2(val) __write_64bit_c0_register($25, 3, val) + +static int (*save_perf_irq)(void); + +static struct loongson3_register_config { + unsigned int control1; + unsigned int control2; + unsigned long long reset_counter1; + unsigned long long reset_counter2; + int ctr1_enable, ctr2_enable; +} reg; + +static void reset_counters(void *arg) +{ + write_c0_perfhi1(0); + write_c0_perfhi2(0); + write_c0_perflo1(0xc0000000); + write_c0_perflo2(0x40000000); +} + +/* Compute all of the registers in preparation for enabling profiling. */ +static void loongson3_reg_setup(struct op_counter_config *ctr) +{ + unsigned int control1 = 0; + unsigned int control2 = 0; + + reg.reset_counter1 = 0; + reg.reset_counter2 = 0; + /* Compute the performance counter control word. */ + /* For now count kernel and user mode */ + if (ctr[0].enabled) { + control1 |= LOONGSON3_PERFCTRL_EVENT(0, ctr[0].event) | + LOONGSON3_PERFCTRL_ENABLE; + if (ctr[0].kernel) + control1 |= LOONGSON3_PERFCTRL_KERNEL; + if (ctr[0].user) + control1 |= LOONGSON3_PERFCTRL_USER; + reg.reset_counter1 = 0x8000000000000000ULL - ctr[0].count; + } + + if (ctr[1].enabled) { + control2 |= LOONGSON3_PERFCTRL_EVENT(1, ctr[1].event) | + LOONGSON3_PERFCTRL_ENABLE; + if (ctr[1].kernel) + control2 |= LOONGSON3_PERFCTRL_KERNEL; + if (ctr[1].user) + control2 |= LOONGSON3_PERFCTRL_USER; + reg.reset_counter2 = 0x8000000000000000ULL - ctr[1].count; + } + + if (ctr[0].enabled) + control1 |= LOONGSON3_PERFCTRL_EXL; + if (ctr[1].enabled) + control2 |= LOONGSON3_PERFCTRL_EXL; + + reg.control1 = control1; + reg.control2 = control2; + reg.ctr1_enable = ctr[0].enabled; + reg.ctr2_enable = ctr[1].enabled; +} + +/* Program all of the registers in preparation for enabling profiling. */ +static void loongson3_cpu_setup(void *args) +{ + uint64_t perfcount1, perfcount2; + + perfcount1 = reg.reset_counter1; + perfcount2 = reg.reset_counter2; + write_c0_perfhi1(perfcount1); + write_c0_perfhi2(perfcount2); +} + +static void loongson3_cpu_start(void *args) +{ + /* Start all counters on current CPU */ + reg.control1 |= (LOONGSON3_PERFCTRL_W|LOONGSON3_PERFCTRL_M); + reg.control2 |= (LOONGSON3_PERFCTRL_W|LOONGSON3_PERFCTRL_M); + + if (reg.ctr1_enable) + write_c0_perflo1(reg.control1); + if (reg.ctr2_enable) + write_c0_perflo2(reg.control2); +} + +static void loongson3_cpu_stop(void *args) +{ + /* Stop all counters on current CPU */ + write_c0_perflo1(0xc0000000); + write_c0_perflo2(0x40000000); + memset(®, 0, sizeof(reg)); +} + +static int loongson3_perfcount_handler(void) +{ + unsigned long flags; + uint64_t counter1, counter2; + uint32_t cause, handled = IRQ_NONE; + struct pt_regs *regs = get_irq_regs(); + + cause = read_c0_cause(); + if (!(cause & CAUSEF_PCI)) + return handled; + + counter1 = read_c0_perfhi1(); + counter2 = read_c0_perfhi2(); + + local_irq_save(flags); + + if (counter1 & LOONGSON3_PERFCNT_OVERFLOW) { + if (reg.ctr1_enable) + oprofile_add_sample(regs, 0); + counter1 = reg.reset_counter1; + } + if (counter2 & LOONGSON3_PERFCNT_OVERFLOW) { + if (reg.ctr2_enable) + oprofile_add_sample(regs, 1); + counter2 = reg.reset_counter2; + } + + local_irq_restore(flags); + + write_c0_perfhi1(counter1); + write_c0_perfhi2(counter2); + + if (!(cause & CAUSEF_TI)) + handled = IRQ_HANDLED; + + return handled; +} + +static int loongson3_starting_cpu(unsigned int cpu) +{ + write_c0_perflo1(reg.control1); + write_c0_perflo2(reg.control2); + return 0; +} + +static int loongson3_dying_cpu(unsigned int cpu) +{ + write_c0_perflo1(0xc0000000); + write_c0_perflo2(0x40000000); + return 0; +} + +static int __init loongson3_init(void) +{ + on_each_cpu(reset_counters, NULL, 1); + cpuhp_setup_state_nocalls(CPUHP_AP_MIPS_OP_LOONGSON3_STARTING, + "mips/oprofile/loongson3:starting", + loongson3_starting_cpu, loongson3_dying_cpu); + save_perf_irq = perf_irq; + perf_irq = loongson3_perfcount_handler; + + return 0; +} + +static void loongson3_exit(void) +{ + on_each_cpu(reset_counters, NULL, 1); + cpuhp_remove_state_nocalls(CPUHP_AP_MIPS_OP_LOONGSON3_STARTING); + perf_irq = save_perf_irq; +} + +struct op_mips_model op_model_loongson3_ops = { + .reg_setup = loongson3_reg_setup, + .cpu_setup = loongson3_cpu_setup, + .init = loongson3_init, + .exit = loongson3_exit, + .cpu_start = loongson3_cpu_start, + .cpu_stop = loongson3_cpu_stop, + .cpu_type = "mips/loongson3", + .num_counters = 2 +}; 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