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|
/*
* Cell Broadband Engine OProfile Support
*
* (C) Copyright IBM Corporation 2006
*
* Author: David Erb (djerb@us.ibm.com)
* Modifications:
* Carl Love <carll@us.ibm.com>
* Maynard Johnson <maynardj@us.ibm.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/kthread.h>
#include <linux/oprofile.h>
#include <linux/percpu.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <asm/cell-pmu.h>
#include <asm/cputable.h>
#include <asm/firmware.h>
#include <asm/io.h>
#include <asm/oprofile_impl.h>
#include <asm/processor.h>
#include <asm/prom.h>
#include <asm/ptrace.h>
#include <asm/reg.h>
#include <asm/rtas.h>
#include <asm/system.h>
#include "../platforms/cell/interrupt.h"
#define PPU_CYCLES_EVENT_NUM 1 /* event number for CYCLES */
#define CBE_COUNT_ALL_CYCLES 0x42800000 /* PPU cycle event specifier */
#define NUM_THREADS 2
#define VIRT_CNTR_SW_TIME_NS 100000000 // 0.5 seconds
struct pmc_cntrl_data {
unsigned long vcntr;
unsigned long evnts;
unsigned long masks;
unsigned long enabled;
};
/*
* ibm,cbe-perftools rtas parameters
*/
struct pm_signal {
u16 cpu; /* Processor to modify */
u16 sub_unit; /* hw subunit this applies to (if applicable) */
u16 signal_group; /* Signal Group to Enable/Disable */
u8 bus_word; /* Enable/Disable on this Trace/Trigger/Event
* Bus Word(s) (bitmask)
*/
u8 bit; /* Trigger/Event bit (if applicable) */
};
/*
* rtas call arguments
*/
enum {
SUBFUNC_RESET = 1,
SUBFUNC_ACTIVATE = 2,
SUBFUNC_DEACTIVATE = 3,
PASSTHRU_IGNORE = 0,
PASSTHRU_ENABLE = 1,
PASSTHRU_DISABLE = 2,
};
struct pm_cntrl {
u16 enable;
u16 stop_at_max;
u16 trace_mode;
u16 freeze;
u16 count_mode;
};
static struct {
u32 group_control;
u32 debug_bus_control;
struct pm_cntrl pm_cntrl;
u32 pm07_cntrl[NR_PHYS_CTRS];
} pm_regs;
#define GET_SUB_UNIT(x) ((x & 0x0000f000) >> 12)
#define GET_BUS_WORD(x) ((x & 0x000000f0) >> 4)
#define GET_BUS_TYPE(x) ((x & 0x00000300) >> 8)
#define GET_POLARITY(x) ((x & 0x00000002) >> 1)
#define GET_COUNT_CYCLES(x) (x & 0x00000001)
#define GET_INPUT_CONTROL(x) ((x & 0x00000004) >> 2)
static DEFINE_PER_CPU(unsigned long[NR_PHYS_CTRS], pmc_values);
static struct pmc_cntrl_data pmc_cntrl[NUM_THREADS][NR_PHYS_CTRS];
/* Interpetation of hdw_thread:
* 0 - even virtual cpus 0, 2, 4,...
* 1 - odd virtual cpus 1, 3, 5, ...
*/
static u32 hdw_thread;
static u32 virt_cntr_inter_mask;
static struct timer_list timer_virt_cntr;
/* pm_signal needs to be global since it is initialized in
* cell_reg_setup at the time when the necessary information
* is available.
*/
static struct pm_signal pm_signal[NR_PHYS_CTRS];
static int pm_rtas_token;
static u32 reset_value[NR_PHYS_CTRS];
static int num_counters;
static int oprofile_running;
static spinlock_t virt_cntr_lock = SPIN_LOCK_UNLOCKED;
static u32 ctr_enabled;
static unsigned char trace_bus[4];
static unsigned char input_bus[2];
/*
* Firmware interface functions
*/
static int
rtas_ibm_cbe_perftools(int subfunc, int passthru,
void *address, unsigned long length)
{
u64 paddr = __pa(address);
return rtas_call(pm_rtas_token, 5, 1, NULL, subfunc, passthru,
paddr >> 32, paddr & 0xffffffff, length);
}
static void pm_rtas_reset_signals(u32 node)
{
int ret;
struct pm_signal pm_signal_local;
/* The debug bus is being set to the passthru disable state.
* However, the FW still expects atleast one legal signal routing
* entry or it will return an error on the arguments. If we don't
* supply a valid entry, we must ignore all return values. Ignoring
* all return values means we might miss an error we should be
* concerned about.
*/
/* fw expects physical cpu #. */
pm_signal_local.cpu = node;
pm_signal_local.signal_group = 21;
pm_signal_local.bus_word = 1;
pm_signal_local.sub_unit = 0;
pm_signal_local.bit = 0;
ret = rtas_ibm_cbe_perftools(SUBFUNC_RESET, PASSTHRU_DISABLE,
&pm_signal_local,
sizeof(struct pm_signal));
if (ret)
printk(KERN_WARNING "%s: rtas returned: %d\n",
__FUNCTION__, ret);
}
static void pm_rtas_activate_signals(u32 node, u32 count)
{
int ret;
int j;
struct pm_signal pm_signal_local[NR_PHYS_CTRS];
for (j = 0; j < count; j++) {
/* fw expects physical cpu # */
pm_signal_local[j].cpu = node;
pm_signal_local[j].signal_group = pm_signal[j].signal_group;
pm_signal_local[j].bus_word = pm_signal[j].bus_word;
pm_signal_local[j].sub_unit = pm_signal[j].sub_unit;
pm_signal_local[j].bit = pm_signal[j].bit;
}
ret = rtas_ibm_cbe_perftools(SUBFUNC_ACTIVATE, PASSTHRU_ENABLE,
pm_signal_local,
count * sizeof(struct pm_signal));
if (ret)
printk(KERN_WARNING "%s: rtas returned: %d\n",
__FUNCTION__, ret);
}
/*
* PM Signal functions
*/
static void set_pm_event(u32 ctr, int event, u32 unit_mask)
{
struct pm_signal *p;
u32 signal_bit;
u32 bus_word, bus_type, count_cycles, polarity, input_control;
int j, i;
if (event == PPU_CYCLES_EVENT_NUM) {
/* Special Event: Count all cpu cycles */
pm_regs.pm07_cntrl[ctr] = CBE_COUNT_ALL_CYCLES;
p = &(pm_signal[ctr]);
p->signal_group = 21;
p->bus_word = 1;
p->sub_unit = 0;
p->bit = 0;
goto out;
} else {
pm_regs.pm07_cntrl[ctr] = 0;
}
bus_word = GET_BUS_WORD(unit_mask);
bus_type = GET_BUS_TYPE(unit_mask);
count_cycles = GET_COUNT_CYCLES(unit_mask);
polarity = GET_POLARITY(unit_mask);
input_control = GET_INPUT_CONTROL(unit_mask);
signal_bit = (event % 100);
p = &(pm_signal[ctr]);
p->signal_group = event / 100;
p->bus_word = bus_word;
p->sub_unit = unit_mask & 0x0000f000;
pm_regs.pm07_cntrl[ctr] = 0;
pm_regs.pm07_cntrl[ctr] |= PM07_CTR_COUNT_CYCLES(count_cycles);
pm_regs.pm07_cntrl[ctr] |= PM07_CTR_POLARITY(polarity);
pm_regs.pm07_cntrl[ctr] |= PM07_CT
|