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/*
* 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.
*
* Copyright (C) 2004 by Ralf Baechle
*/
#include <linux/init.h>
#include <linux/oprofile.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
#include "op_impl.h"
#define RM9K_COUNTER1_EVENT(event) ((event) << 0)
#define RM9K_COUNTER1_SUPERVISOR (1ULL << 7)
#define RM9K_COUNTER1_KERNEL (1ULL << 8)
#define RM9K_COUNTER1_USER (1ULL << 9)
#define RM9K_COUNTER1_ENABLE (1ULL << 10)
#define RM9K_COUNTER1_OVERFLOW (1ULL << 15)
#define RM9K_COUNTER2_EVENT(event) ((event) << 16)
#define RM9K_COUNTER2_SUPERVISOR (1ULL << 23)
#define RM9K_COUNTER2_KERNEL (1ULL << 24)
#define RM9K_COUNTER2_USER (1ULL << 25)
#define RM9K_COUNTER2_ENABLE (1ULL << 26)
#define RM9K_COUNTER2_OVERFLOW (1ULL << 31)
extern unsigned int rm9000_perfcount_irq;
static struct rm9k_register_config {
unsigned int control;
unsigned int reset_counter1;
unsigned int reset_counter2;
} reg;
/* Compute all of the registers in preparation for enabling profiling. */
static void rm9000_reg_setup(struct op_counter_config *ctr)
{
unsigned int control = 0;
/* Compute the performance counter control word. */
/* For now count kernel and user mode */
if (ctr[0].enabled)
control |= RM9K_COUNTER1_EVENT(ctr[0].event) |
RM9K_COUNTER1_KERNEL |
RM9K_COUNTER1_USER |
RM9K_COUNTER1_ENABLE;
if (ctr[1].enabled)
control |= RM9K_COUNTER2_EVENT(ctr[1].event) |
RM9K_COUNTER2_KERNEL |
RM9K_COUNTER2_USER |
RM9K_COUNTER2_ENABLE;
reg.control = control;
reg.reset_counter1 = 0x80000000 - ctr[0].count;
reg.reset_counter2 = 0x80000000 - ctr[1].count;
}
/* Program all of the registers in preparation for enabling profiling. */
static void rm9000_cpu_setup (void *args)
{
uint64_t perfcount;
perfcount = ((uint64_t) reg.reset_counter2 << 32) | reg.reset_counter1;
write_c0_perfcount(perfcount);
}
static void rm9000_cpu_start(void *args)
{
/* Start all counters on current CPU */
write_c0_perfcontrol(reg.control);
}
static void rm9000_cpu_stop(void *args)
{
/* Stop all counters on current CPU */
write_c0_perfcontrol(0);
}
static irqreturn_t rm9000_perfcount_handler(int irq, void * dev_id,
struct pt_regs *regs)
{
unsigned int control = read_c0_perfcontrol();
uint32_t counter1, counter2;
uint64_t counters;
/*
* RM9000 combines two 32-bit performance counters into a single
* 64-bit coprocessor zero register. To avoid a race updating the
* registers we need to stop the counters while we're messing with
* them ...
*/
write_c0_perfcontrol(0);
counters = read_c0_perfcount();
counter1 = counters;
counter2 = counters >> 32;
if (control & RM9K_COUNTER1_OVERFLOW) {
oprofile_add_sample(regs, 0);
counter1 = reg.reset_counter1;
}
if (control & RM9K_COUNTER2_OVERFLOW) {
oprofile_add_sample(regs, 1);
counter2 = reg.reset_counter2;
}
counters = ((uint64_t)counter2 << 32) | counter1;
write_c0_perfcount(counters);
write_c0_perfcontrol(reg.control);
return IRQ_HANDLED;
}
static int __init rm9000_init(void)
{
return request_irq(rm9000_perfcount_irq, rm9000_perfcount_handler,
0, "Perfcounter", NULL);
}
static void rm9000_exit(void)
{
free_irq(rm9000_perfcount_irq, NULL);
}
struct op_mips_model op_model_rm9000 = {
.reg_setup = rm9000_reg_setup,
.cpu_setup = rm9000_cpu_setup,
.init = rm9000_init,
.exit = rm9000_exit,
.cpu_start = rm9000_cpu_start,
.cpu_stop = rm9000_cpu_stop,
.cpu_type = "mips/rm9000",
.num_counters = 2
};
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