cregit-Linux how code gets into the kernel

Release 4.14 arch/alpha/oprofile/op_model_ev6.c

/**
 * @file arch/alpha/oprofile/op_model_ev6.c
 *
 * @remark Copyright 2002 OProfile authors
 * @remark Read the file COPYING
 *
 * @author Richard Henderson <rth@twiddle.net>
 */

#include <linux/oprofile.h>
#include <linux/smp.h>
#include <asm/ptrace.h>

#include "op_impl.h"


/* Compute all of the registers in preparation for enabling profiling.  */


static void ev6_reg_setup(struct op_register_config *reg, struct op_counter_config *ctr, struct op_system_config *sys) { unsigned long ctl, reset, need_reset, i; /* Select desired events. We've mapped the event numbers such that they fit directly into the event selection fields. */ ctl = 0; if (ctr[0].enabled && ctr[0].event) ctl |= (ctr[0].event & 1) << 4; if (ctr[1].enabled) ctl |= (ctr[1].event - 2) & 15; reg->mux_select = ctl; /* Select logging options. */ /* ??? Need to come up with some mechanism to trace only selected processes. EV6 does not have a mechanism to select kernel or user mode only. For now, enable always. */ reg->proc_mode = 0; /* EV6 cannot change the width of the counters as with the other implementations. But fortunately, we can write to the counters and set the value such that it will overflow at the right time. */ reset = need_reset = 0; for (i = 0; i < 2; ++i) { unsigned long count = ctr[i].count; if (!ctr[i].enabled) continue; if (count > 0x100000) count = 0x100000; ctr[i].count = count; reset |= (0x100000 - count) << (i ? 6 : 28); if (count != 0x100000) need_reset |= 1 << i; } reg->reset_values = reset; reg->need_reset = need_reset; }

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Richard Henderson208100.00%2100.00%
Total208100.00%2100.00%

/* Program all of the registers in preparation for enabling profiling. */
static void ev6_cpu_setup (void *x) { struct op_register_config *reg = x; wrperfmon(2, reg->mux_select); wrperfmon(3, reg->proc_mode); wrperfmon(6, reg->reset_values | 3); }

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Richard Henderson46100.00%1100.00%
Total46100.00%1100.00%

/* CTR is a counter for which the user has requested an interrupt count in between one of the widths selectable in hardware. Reset the count for CTR to the value stored in REG->RESET_VALUES. */
static void ev6_reset_ctr(struct op_register_config *reg, unsigned long ctr) { wrperfmon(6, reg->reset_values | (1 << ctr)); }

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Richard Henderson30100.00%1100.00%
Total30100.00%1100.00%


static void ev6_handle_interrupt(unsigned long which, struct pt_regs *regs, struct op_counter_config *ctr) { /* Record the sample. */ oprofile_add_sample(regs, which); }

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Richard Henderson28100.00%2100.00%
Total28100.00%2100.00%

struct op_axp_model op_model_ev6 = { .reg_setup = ev6_reg_setup, .cpu_setup = ev6_cpu_setup, .reset_ctr = ev6_reset_ctr, .handle_interrupt = ev6_handle_interrupt, .cpu_type = "alpha/ev6", .num_counters = 2, .can_set_proc_mode = 0, };

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Richard Henderson369100.00%5100.00%
Total369100.00%5100.00%
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