arch/mips/oprofile/op_model_loongson3.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  */
   7 #include <linux/init.h>
   8 #include <linux/cpu.h>
   9 #include <linux/smp.h>
  10 #include <linux/proc_fs.h>
  11 #include <linux/oprofile.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/uaccess.h>
  15 #include <irq.h>
  16 #include <loongson.h>
  17 #include "op_impl.h"
  18
  19 #define LOONGSON3_PERFCNT_OVERFLOW      (1ULL << 63)
  20
  21 #define LOONGSON3_PERFCTRL_EXL          (1UL << 0)
  22 #define LOONGSON3_PERFCTRL_KERNEL       (1UL << 1)
  23 #define LOONGSON3_PERFCTRL_SUPERVISOR   (1UL << 2)
  24 #define LOONGSON3_PERFCTRL_USER         (1UL << 3)
  25 #define LOONGSON3_PERFCTRL_ENABLE       (1UL << 4)
  26 #define LOONGSON3_PERFCTRL_W            (1UL << 30)
  27 #define LOONGSON3_PERFCTRL_M            (1UL << 31)
  28 #define LOONGSON3_PERFCTRL_EVENT(idx, event) \
  29         (((event) & (idx ? 0x0f : 0x3f)) << 5)
  30
  31 /* Loongson-3 PerfCount performance counter1 register */
  32 #define read_c0_perflo1() __read_64bit_c0_register($25, 0)
  33 #define write_c0_perflo1(val) __write_64bit_c0_register($25, 0, val)
  34 #define read_c0_perfhi1() __read_64bit_c0_register($25, 1)
  35 #define write_c0_perfhi1(val) __write_64bit_c0_register($25, 1, val)
  36
  37 /* Loongson-3 PerfCount performance counter2 register */
  38 #define read_c0_perflo2() __read_64bit_c0_register($25, 2)
  39 #define write_c0_perflo2(val) __write_64bit_c0_register($25, 2, val)
  40 #define read_c0_perfhi2() __read_64bit_c0_register($25, 3)
  41 #define write_c0_perfhi2(val) __write_64bit_c0_register($25, 3, val)
  42
  43 static int (*save_perf_irq)(void);
  44
  45 static struct loongson3_register_config {
  46         unsigned int control1;
  47         unsigned int control2;
  48         unsigned long long reset_counter1;
  49         unsigned long long reset_counter2;
  50         int ctr1_enable, ctr2_enable;
  51 } reg;
  52
  53 static void reset_counters(void *arg)
  54 {
  55         write_c0_perfhi1(0);
  56         write_c0_perfhi2(0);
  57         write_c0_perflo1(0xc0000000);
  58         write_c0_perflo2(0x40000000);
  59 }
  60
  61 /* Compute all of the registers in preparation for enabling profiling. */
  62 static void loongson3_reg_setup(struct op_counter_config *ctr)
  63 {
  64         unsigned int control1 = 0;
  65         unsigned int control2 = 0;
  66
  67         reg.reset_counter1 = 0;
  68         reg.reset_counter2 = 0;
  69         /* Compute the performance counter control word. */
  70         /* For now count kernel and user mode */
  71         if (ctr[0].enabled) {
  72                 control1 |= LOONGSON3_PERFCTRL_EVENT(0, ctr[0].event) |
  73                                         LOONGSON3_PERFCTRL_ENABLE;
  74                 if (ctr[0].kernel)
  75                         control1 |= LOONGSON3_PERFCTRL_KERNEL;
  76                 if (ctr[0].user)
  77                         control1 |= LOONGSON3_PERFCTRL_USER;
  78                 reg.reset_counter1 = 0x8000000000000000ULL - ctr[0].count;
  79         }
  80
  81         if (ctr[1].enabled) {
  82                 control2 |= LOONGSON3_PERFCTRL_EVENT(1, ctr[1].event) |
  83                                         LOONGSON3_PERFCTRL_ENABLE;
  84                 if (ctr[1].kernel)
  85                         control2 |= LOONGSON3_PERFCTRL_KERNEL;
  86                 if (ctr[1].user)
  87                         control2 |= LOONGSON3_PERFCTRL_USER;
  88                 reg.reset_counter2 = 0x8000000000000000ULL - ctr[1].count;
  89         }
  90
  91         if (ctr[0].enabled)
  92                 control1 |= LOONGSON3_PERFCTRL_EXL;
  93         if (ctr[1].enabled)
  94                 control2 |= LOONGSON3_PERFCTRL_EXL;
  95
  96         reg.control1 = control1;
  97         reg.control2 = control2;
  98         reg.ctr1_enable = ctr[0].enabled;
  99         reg.ctr2_enable = ctr[1].enabled;
 100 }
 101
 102 /* Program all of the registers in preparation for enabling profiling. */
 103 static void loongson3_cpu_setup(void *args)
 104 {
 105         uint64_t perfcount1, perfcount2;
 106
 107         perfcount1 = reg.reset_counter1;
 108         perfcount2 = reg.reset_counter2;
 109         write_c0_perfhi1(perfcount1);
 110         write_c0_perfhi2(perfcount2);
 111 }
 112
 113 static void loongson3_cpu_start(void *args)
 114 {
 115         /* Start all counters on current CPU */
 116         reg.control1 |= (LOONGSON3_PERFCTRL_W|LOONGSON3_PERFCTRL_M);
 117         reg.control2 |= (LOONGSON3_PERFCTRL_W|LOONGSON3_PERFCTRL_M);
 118
 119         if (reg.ctr1_enable)
 120                 write_c0_perflo1(reg.control1);
 121         if (reg.ctr2_enable)
 122                 write_c0_perflo2(reg.control2);
 123 }
 124
 125 static void loongson3_cpu_stop(void *args)
 126 {
 127         /* Stop all counters on current CPU */
 128         write_c0_perflo1(0xc0000000);
 129         write_c0_perflo2(0x40000000);
 130         memset(&reg, 0, sizeof(reg));
 131 }
 132
 133 static int loongson3_perfcount_handler(void)
 134 {
 135         unsigned long flags;
 136         uint64_t counter1, counter2;
 137         uint32_t cause, handled = IRQ_NONE;
 138         struct pt_regs *regs = get_irq_regs();
 139
 140         cause = read_c0_cause();
 141         if (!(cause & CAUSEF_PCI))
 142                 return handled;
 143
 144         counter1 = read_c0_perfhi1();
 145         counter2 = read_c0_perfhi2();
 146
 147         local_irq_save(flags);
 148
 149         if (counter1 & LOONGSON3_PERFCNT_OVERFLOW) {
 150                 if (reg.ctr1_enable)
 151                         oprofile_add_sample(regs, 0);
 152                 counter1 = reg.reset_counter1;
 153         }
 154         if (counter2 & LOONGSON3_PERFCNT_OVERFLOW) {
 155                 if (reg.ctr2_enable)
 156                         oprofile_add_sample(regs, 1);
 157                 counter2 = reg.reset_counter2;
 158         }
 159
 160         local_irq_restore(flags);
 161
 162         write_c0_perfhi1(counter1);
 163         write_c0_perfhi2(counter2);
 164
 165         if (!(cause & CAUSEF_TI))
 166                 handled = IRQ_HANDLED;
 167
 168         return handled;
 169 }
 170
 171 static int loongson3_starting_cpu(unsigned int cpu)
 172 {
 173         write_c0_perflo1(reg.control1);
 174         write_c0_perflo2(reg.control2);
 175         return 0;
 176 }
 177
 178 static int loongson3_dying_cpu(unsigned int cpu)
 179 {
 180         write_c0_perflo1(0xc0000000);
 181         write_c0_perflo2(0x40000000);
 182         return 0;
 183 }
 184
 185 static int __init loongson3_init(void)
 186 {
 187         on_each_cpu(reset_counters, NULL, 1);
 188         cpuhp_setup_state_nocalls(CPUHP_AP_MIPS_OP_LOONGSON3_STARTING,
 189                                   "mips/oprofile/loongson3:starting",
 190                                   loongson3_starting_cpu, loongson3_dying_cpu);
 191         save_perf_irq = perf_irq;
 192         perf_irq = loongson3_perfcount_handler;
 193
 194         return 0;
 195 }
 196
 197 static void loongson3_exit(void)
 198 {
 199         on_each_cpu(reset_counters, NULL, 1);
 200         cpuhp_remove_state_nocalls(CPUHP_AP_MIPS_OP_LOONGSON3_STARTING);
 201         perf_irq = save_perf_irq;
 202 }
 203
 204 struct op_mips_model op_model_loongson3_ops = {
 205         .reg_setup      = loongson3_reg_setup,
 206         .cpu_setup      = loongson3_cpu_setup,
 207         .init           = loongson3_init,
 208         .exit           = loongson3_exit,
 209         .cpu_start      = loongson3_cpu_start,
 210         .cpu_stop       = loongson3_cpu_stop,
 211         .cpu_type       = "mips/loongson3",
 212         .num_counters   = 2
 213 };