102 lines
2.6 KiB
C
102 lines
2.6 KiB
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;
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/* 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));
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
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,
|
|
};
|