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/arch/alpha/oprofile/op_model_ev6.c

https://bitbucket.org/evzijst/gittest
C | 103 lines | 62 code | 17 blank | 24 comment | 8 complexity | dc521031402d8d6b04e758c0b4b594db MD5 | raw file
  1/**
  2 * @file arch/alpha/oprofile/op_model_ev6.c
  3 *
  4 * @remark Copyright 2002 OProfile authors
  5 * @remark Read the file COPYING
  6 *
  7 * @author Richard Henderson <rth@twiddle.net>
  8 */
  9
 10#include <linux/oprofile.h>
 11#include <linux/init.h>
 12#include <linux/smp.h>
 13#include <asm/ptrace.h>
 14#include <asm/system.h>
 15
 16#include "op_impl.h"
 17
 18
 19/* Compute all of the registers in preparation for enabling profiling.  */
 20
 21static void
 22ev6_reg_setup(struct op_register_config *reg,
 23	      struct op_counter_config *ctr,
 24	      struct op_system_config *sys)
 25{
 26	unsigned long ctl, reset, need_reset, i;
 27
 28	/* Select desired events.  We've mapped the event numbers
 29	   such that they fit directly into the event selection fields.  */
 30	ctl = 0;
 31	if (ctr[0].enabled && ctr[0].event)
 32		ctl |= (ctr[0].event & 1) << 4;
 33	if (ctr[1].enabled)
 34		ctl |= (ctr[1].event - 2) & 15;
 35	reg->mux_select = ctl;
 36
 37	/* Select logging options.  */
 38	/* ??? Need to come up with some mechanism to trace only
 39	   selected processes.  EV6 does not have a mechanism to
 40	   select kernel or user mode only.  For now, enable always.  */
 41	reg->proc_mode = 0;
 42
 43	/* EV6 cannot change the width of the counters as with the
 44	   other implementations.  But fortunately, we can write to
 45	   the counters and set the value such that it will overflow
 46	   at the right time.  */
 47	reset = need_reset = 0;
 48	for (i = 0; i < 2; ++i) {
 49		unsigned long count = ctr[i].count;
 50		if (!ctr[i].enabled)
 51			continue;
 52
 53		if (count > 0x100000)
 54			count = 0x100000;
 55		ctr[i].count = count;
 56		reset |= (0x100000 - count) << (i ? 6 : 28);
 57		if (count != 0x100000)
 58			need_reset |= 1 << i;
 59	}
 60	reg->reset_values = reset;
 61	reg->need_reset = need_reset;
 62}
 63
 64/* Program all of the registers in preparation for enabling profiling.  */
 65
 66static void
 67ev6_cpu_setup (void *x)
 68{
 69	struct op_register_config *reg = x;
 70
 71	wrperfmon(2, reg->mux_select);
 72	wrperfmon(3, reg->proc_mode);
 73	wrperfmon(6, reg->reset_values | 3);
 74}
 75
 76/* CTR is a counter for which the user has requested an interrupt count
 77   in between one of the widths selectable in hardware.  Reset the count
 78   for CTR to the value stored in REG->RESET_VALUES.  */
 79
 80static void
 81ev6_reset_ctr(struct op_register_config *reg, unsigned long ctr)
 82{
 83	wrperfmon(6, reg->reset_values | (1 << ctr));
 84}
 85
 86static void
 87ev6_handle_interrupt(unsigned long which, struct pt_regs *regs,
 88		     struct op_counter_config *ctr)
 89{
 90	/* Record the sample.  */
 91	oprofile_add_sample(regs, which);
 92}
 93
 94
 95struct op_axp_model op_model_ev6 = {
 96	.reg_setup		= ev6_reg_setup,
 97	.cpu_setup		= ev6_cpu_setup,
 98	.reset_ctr		= ev6_reset_ctr,
 99	.handle_interrupt	= ev6_handle_interrupt,
100	.cpu_type		= "alpha/ev6",
101	.num_counters		= 2,
102	.can_set_proc_mode	= 0,
103};