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* Cell Broadband Engine OProfile Support
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* (C) Copyright IBM Corporation 2006
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* Author: David Erb (djerb@us.ibm.com)
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* Carl Love <carll@us.ibm.com>
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* Maynard Johnson <maynardj@us.ibm.com>
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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#include <linux/cpufreq.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/kthread.h>
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#include <linux/oprofile.h>
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#include <linux/percpu.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <linux/timer.h>
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#include <asm/cell-pmu.h>
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#include <asm/cputable.h>
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#include <asm/firmware.h>
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#include <asm/oprofile_impl.h>
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#include <asm/processor.h>
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#include <asm/ptrace.h>
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#include <asm/system.h>
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#include <asm/cell-regs.h>
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#include "../platforms/cell/interrupt.h"
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#include "cell/pr_util.h"
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#define PPU_PROFILING 0
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#define SPU_PROFILING_CYCLES 1
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#define SPU_PROFILING_EVENTS 2
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#define SPU_EVENT_NUM_START 4100
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#define SPU_EVENT_NUM_STOP 4399
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#define SPU_PROFILE_EVENT_ADDR 4363 /* spu, address trace, decimal */
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#define SPU_PROFILE_EVENT_ADDR_MASK_A 0x146 /* sub unit set to zero */
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#define SPU_PROFILE_EVENT_ADDR_MASK_B 0x186 /* sub unit set to zero */
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#define NUM_SPUS_PER_NODE 8
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#define SPU_CYCLES_EVENT_NUM 2 /* event number for SPU_CYCLES */
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#define PPU_CYCLES_EVENT_NUM 1 /* event number for CYCLES */
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#define PPU_CYCLES_GRP_NUM 1 /* special group number for identifying
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#define CBE_COUNT_ALL_CYCLES 0x42800000 /* PPU cycle event specifier */
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#define NUM_THREADS 2 /* number of physical threads in
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#define NUM_DEBUG_BUS_WORDS 4
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#define NUM_INPUT_BUS_WORDS 2
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#define MAX_SPU_COUNT 0xFFFFFF /* maximum 24 bit LFSR value */
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/* Minimum HW interval timer setting to send value to trace buffer is 10 cycle.
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* To configure counter to send value every N cycles set counter to
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#define NUM_INTERVAL_CYC 0xFFFFFFFF - 10
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* spu_cycle_reset is the number of cycles between samples.
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* This variable is used for SPU profiling and should ONLY be set
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* at the beginning of cell_reg_setup; otherwise, it's read-only.
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static unsigned int spu_cycle_reset;
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static unsigned int profiling_mode;
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static int spu_evnt_phys_spu_indx;
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struct pmc_cntrl_data {
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unsigned long enabled;
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* ibm,cbe-perftools rtas parameters
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u16 cpu; /* Processor to modify */
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u16 sub_unit; /* hw subunit this applies to (if applicable)*/
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short int signal_group; /* Signal Group to Enable/Disable */
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u8 bus_word; /* Enable/Disable on this Trace/Trigger/Event
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* Bus Word(s) (bitmask)
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u8 bit; /* Trigger/Event bit (if applicable) */
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* rtas call arguments
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SUBFUNC_ACTIVATE = 2,
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SUBFUNC_DEACTIVATE = 3,
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PASSTHRU_DISABLE = 2,
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u32 debug_bus_control;
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struct pm_cntrl pm_cntrl;
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u32 pm07_cntrl[NR_PHYS_CTRS];
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#define GET_SUB_UNIT(x) ((x & 0x0000f000) >> 12)
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#define GET_BUS_WORD(x) ((x & 0x000000f0) >> 4)
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#define GET_BUS_TYPE(x) ((x & 0x00000300) >> 8)
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#define GET_POLARITY(x) ((x & 0x00000002) >> 1)
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#define GET_COUNT_CYCLES(x) (x & 0x00000001)
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#define GET_INPUT_CONTROL(x) ((x & 0x00000004) >> 2)
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static DEFINE_PER_CPU(unsigned long[NR_PHYS_CTRS], pmc_values);
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static unsigned long spu_pm_cnt[MAX_NUMNODES * NUM_SPUS_PER_NODE];
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static struct pmc_cntrl_data pmc_cntrl[NUM_THREADS][NR_PHYS_CTRS];
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* The CELL profiling code makes rtas calls to setup the debug bus to
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* route the performance signals. Additionally, SPU profiling requires
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* a second rtas call to setup the hardware to capture the SPU PCs.
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* The EIO error value is returned if the token lookups or the rtas
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* call fail. The EIO error number is the best choice of the existing
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* error numbers. The probability of rtas related error is very low. But
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* by returning EIO and printing additional information to dmsg the user
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* will know that OProfile did not start and dmesg will tell them why.
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* OProfile does not support returning errors on Stop. Not a huge issue
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* since failure to reset the debug bus or stop the SPU PC collection is
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* not a fatel issue. Chances are if the Stop failed, Start doesn't work
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* Interpetation of hdw_thread:
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* 0 - even virtual cpus 0, 2, 4,...
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* 1 - odd virtual cpus 1, 3, 5, ...
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* FIXME: this is strictly wrong, we need to clean this up in a number
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* of places. It works for now. -arnd
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static u32 hdw_thread;
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static u32 virt_cntr_inter_mask;
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static struct timer_list timer_virt_cntr;
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static struct timer_list timer_spu_event_swap;
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* pm_signal needs to be global since it is initialized in
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* cell_reg_setup at the time when the necessary information
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static struct pm_signal pm_signal[NR_PHYS_CTRS];
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static int pm_rtas_token; /* token for debug bus setup call */
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static int spu_rtas_token; /* token for SPU cycle profiling */
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static u32 reset_value[NR_PHYS_CTRS];
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static int num_counters;
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static int oprofile_running;
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static DEFINE_SPINLOCK(cntr_lock);
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static u32 ctr_enabled;
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static unsigned char input_bus[NUM_INPUT_BUS_WORDS];
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* Firmware interface functions
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rtas_ibm_cbe_perftools(int subfunc, int passthru,
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void *address, unsigned long length)
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u64 paddr = __pa(address);
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return rtas_call(pm_rtas_token, 5, 1, NULL, subfunc,
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passthru, paddr >> 32, paddr & 0xffffffff, length);
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static void pm_rtas_reset_signals(u32 node)
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struct pm_signal pm_signal_local;
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* The debug bus is being set to the passthru disable state.
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* However, the FW still expects atleast one legal signal routing
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* entry or it will return an error on the arguments. If we don't
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* supply a valid entry, we must ignore all return values. Ignoring
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* all return values means we might miss an error we should be
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/* fw expects physical cpu #. */
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pm_signal_local.cpu = node;
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pm_signal_local.signal_group = 21;
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pm_signal_local.bus_word = 1;
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pm_signal_local.sub_unit = 0;
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pm_signal_local.bit = 0;
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ret = rtas_ibm_cbe_perftools(SUBFUNC_RESET, PASSTHRU_DISABLE,
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sizeof(struct pm_signal));
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* Not a fatal error. For Oprofile stop, the oprofile
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* functions do not support returning an error for
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* failure to stop OProfile.
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printk(KERN_WARNING "%s: rtas returned: %d\n",
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static int pm_rtas_activate_signals(u32 node, u32 count)
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struct pm_signal pm_signal_local[NR_PHYS_CTRS];
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* There is no debug setup required for the cycles event.
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* Note that only events in the same group can be used.
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* Otherwise, there will be conflicts in correctly routing
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* the signals on the debug bus. It is the responsibility
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* of the OProfile user tool to check the events are in
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for (j = 0; j < count; j++) {
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if (pm_signal[j].signal_group != PPU_CYCLES_GRP_NUM) {
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/* fw expects physical cpu # */
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pm_signal_local[i].cpu = node;
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pm_signal_local[i].signal_group
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= pm_signal[j].signal_group;
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pm_signal_local[i].bus_word = pm_signal[j].bus_word;
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pm_signal_local[i].sub_unit = pm_signal[j].sub_unit;
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pm_signal_local[i].bit = pm_signal[j].bit;
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ret = rtas_ibm_cbe_perftools(SUBFUNC_ACTIVATE, PASSTHRU_ENABLE,
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i * sizeof(struct pm_signal));
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printk(KERN_WARNING "%s: rtas returned: %d\n",
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* PM Signal functions
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static void set_pm_event(u32 ctr, int event, u32 unit_mask)
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u32 bus_word, bus_type, count_cycles, polarity, input_control;
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if (event == PPU_CYCLES_EVENT_NUM) {
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/* Special Event: Count all cpu cycles */
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pm_regs.pm07_cntrl[ctr] = CBE_COUNT_ALL_CYCLES;
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p = &(pm_signal[ctr]);
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p->signal_group = PPU_CYCLES_GRP_NUM;
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pm_regs.pm07_cntrl[ctr] = 0;
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bus_word = GET_BUS_WORD(unit_mask);
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bus_type = GET_BUS_TYPE(unit_mask);
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count_cycles = GET_COUNT_CYCLES(unit_mask);
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polarity = GET_POLARITY(unit_mask);
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input_control = GET_INPUT_CONTROL(unit_mask);
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signal_bit = (event % 100);
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p = &(pm_signal[ctr]);
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p->signal_group = event / 100;
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p->bus_word = bus_word;
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p->sub_unit = GET_SUB_UNIT(unit_mask);
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pm_regs.pm07_cntrl[ctr] = 0;
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pm_regs.pm07_cntrl[ctr] |= PM07_CTR_COUNT_CYCLES(count_cycles);
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pm_regs.pm07_cntrl[ctr] |= PM07_CTR_POLARITY(polarity);
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pm_regs.pm07_cntrl[ctr] |= PM07_CTR_INPUT_CONTROL(input_control);
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* Some of the islands signal selection is based on 64 bit words.
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* The debug bus words are 32 bits, the input words to the performance
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* counters are defined as 32 bits. Need to convert the 64 bit island
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* specification to the appropriate 32 input bit and bus word for the
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* performance counter event selection. See the CELL Performance
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* monitoring signals manual and the Perf cntr hardware descriptions
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if (input_control == 0) {
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if (signal_bit > 31) {
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else if (bus_word == 0xc)
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if ((bus_type == 0) && p->signal_group >= 60)
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if ((bus_type == 1) && p->signal_group >= 50)
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pm_regs.pm07_cntrl[ctr] |= PM07_CTR_INPUT_MUX(signal_bit);
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pm_regs.pm07_cntrl[ctr] = 0;
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for (i = 0; i < NUM_DEBUG_BUS_WORDS; i++) {
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if (bus_word & (1 << i)) {
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pm_regs.debug_bus_control |=
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(bus_type << (30 - (2 * i)));
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for (j = 0; j < NUM_INPUT_BUS_WORDS; j++) {
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if (input_bus[j] == 0xff) {
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pm_regs.group_control |=
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(i << (30 - (2 * j)));
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static void write_pm_cntrl(int cpu)
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* Oprofile will use 32 bit counters, set bits 7:10 to 0
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* pmregs.pm_cntrl is a global
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if (pm_regs.pm_cntrl.enable == 1)
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val |= CBE_PM_ENABLE_PERF_MON;
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if (pm_regs.pm_cntrl.stop_at_max == 1)
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val |= CBE_PM_STOP_AT_MAX;
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if (pm_regs.pm_cntrl.trace_mode != 0)
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val |= CBE_PM_TRACE_MODE_SET(pm_regs.pm_cntrl.trace_mode);
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if (pm_regs.pm_cntrl.trace_buf_ovflw == 1)
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val |= CBE_PM_TRACE_BUF_OVFLW(pm_regs.pm_cntrl.trace_buf_ovflw);
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if (pm_regs.pm_cntrl.freeze == 1)
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val |= CBE_PM_FREEZE_ALL_CTRS;
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val |= CBE_PM_SPU_ADDR_TRACE_SET(pm_regs.pm_cntrl.spu_addr_trace);
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* Routine set_count_mode must be called previously to set
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* the count mode based on the user selection of user and kernel.
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val |= CBE_PM_COUNT_MODE_SET(pm_regs.pm_cntrl.count_mode);
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cbe_write_pm(cpu, pm_control, val);
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set_count_mode(u32 kernel, u32 user)
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* The user must specify user and kernel if they want them. If
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* neither is specified, OProfile will count in hypervisor mode.
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* pm_regs.pm_cntrl is a global
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pm_regs.pm_cntrl.count_mode = CBE_COUNT_ALL_MODES;
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pm_regs.pm_cntrl.count_mode =
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CBE_COUNT_SUPERVISOR_MODE;
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pm_regs.pm_cntrl.count_mode = CBE_COUNT_PROBLEM_MODE;
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pm_regs.pm_cntrl.count_mode =
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CBE_COUNT_HYPERVISOR_MODE;
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static inline void enable_ctr(u32 cpu, u32 ctr, u32 *pm07_cntrl)
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pm07_cntrl[ctr] |= CBE_PM_CTR_ENABLE;
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cbe_write_pm07_control(cpu, ctr, pm07_cntrl[ctr]);
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* Oprofile is expected to collect data on all CPUs simultaneously.
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* However, there is one set of performance counters per node. There are
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* two hardware threads or virtual CPUs on each node. Hence, OProfile must
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* multiplex in time the performance counter collection on the two virtual
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* CPUs. The multiplexing of the performance counters is done by this
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* virtual counter routine.
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* The pmc_values used below is defined as 'per-cpu' but its use is
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* more akin to 'per-node'. We need to store two sets of counter
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* values per node -- one for the previous run and one for the next.
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* The per-cpu[NR_PHYS_CTRS] gives us the storage we need. Each odd/even
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* pair of per-cpu arrays is used for storing the previous and next
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* pmc values for a given node.
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* NOTE: We use the per-cpu variable to improve cache performance.
453
* This routine will alternate loading the virtual counters for
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static void cell_virtual_cntr(unsigned long data)
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int i, prev_hdw_thread, next_hdw_thread;
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* Make sure that the interrupt_hander and the virt counter are
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* not both playing with the counters on the same node.
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spin_lock_irqsave(&cntr_lock, flags);
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prev_hdw_thread = hdw_thread;
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/* switch the cpu handling the interrupts */
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hdw_thread = 1 ^ hdw_thread;
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next_hdw_thread = hdw_thread;
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pm_regs.group_control = 0;
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pm_regs.debug_bus_control = 0;
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for (i = 0; i < NUM_INPUT_BUS_WORDS; i++)
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* There are some per thread events. Must do the
483
* set event, for the thread that is being started
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for (i = 0; i < num_counters; i++)
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pmc_cntrl[next_hdw_thread][i].evnts,
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pmc_cntrl[next_hdw_thread][i].masks);
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* The following is done only once per each node, but
492
* we need cpu #, not node #, to pass to the cbe_xxx functions.
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for_each_online_cpu(cpu) {
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if (cbe_get_hw_thread_id(cpu))
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* stop counters, save counter values, restore counts
500
* for previous thread
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cbe_disable_pm_interrupts(cpu);
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for (i = 0; i < num_counters; i++) {
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per_cpu(pmc_values, cpu + prev_hdw_thread)[i]
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= cbe_read_ctr(cpu, i);
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if (per_cpu(pmc_values, cpu + next_hdw_thread)[i]
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/* If the cntr value is 0xffffffff, we must
511
* reset that to 0xfffffff0 when the current
512
* thread is restarted. This will generate a
513
* new interrupt and make sure that we never
514
* restore the counters to the max value. If
515
* the counters were restored to the max value,
516
* they do not increment and no interrupts are
517
* generated. Hence no more samples will be
518
* collected on that cpu.
520
cbe_write_ctr(cpu, i, 0xFFFFFFF0);
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cbe_write_ctr(cpu, i,
525
next_hdw_thread)[i]);
529
* Switch to the other thread. Change the interrupt
530
* and control regs to be scheduled on the CPU
531
* corresponding to the thread to execute.
533
for (i = 0; i < num_counters; i++) {
534
if (pmc_cntrl[next_hdw_thread][i].enabled) {
536
* There are some per thread events.
537
* Must do the set event, enable_cntr
543
cbe_write_pm07_control(cpu, i, 0);
547
/* Enable interrupts on the CPU thread that is starting */
548
cbe_enable_pm_interrupts(cpu, next_hdw_thread,
549
virt_cntr_inter_mask);
553
spin_unlock_irqrestore(&cntr_lock, flags);
555
mod_timer(&timer_virt_cntr, jiffies + HZ / 10);
558
static void start_virt_cntrs(void)
560
init_timer(&timer_virt_cntr);
561
timer_virt_cntr.function = cell_virtual_cntr;
562
timer_virt_cntr.data = 0UL;
563
timer_virt_cntr.expires = jiffies + HZ / 10;
564
add_timer(&timer_virt_cntr);
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static int cell_reg_setup_spu_cycles(struct op_counter_config *ctr,
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struct op_system_config *sys, int num_ctrs)
570
spu_cycle_reset = ctr[0].count;
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* Each node will need to make the rtas call to start
574
* and stop SPU profiling. Get the token once and store it.
576
spu_rtas_token = rtas_token("ibm,cbe-spu-perftools");
578
if (unlikely(spu_rtas_token == RTAS_UNKNOWN_SERVICE)) {
580
"%s: rtas token ibm,cbe-spu-perftools unknown\n",
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/* Unfortunately, the hardware will only support event profiling
588
* on one SPU per node at a time. Therefore, we must time slice
589
* the profiling across all SPUs in the node. Note, we do this
590
* in parallel for each node. The following routine is called
591
* periodically based on kernel timer to switch which SPU is
592
* being monitored in a round robbin fashion.
594
static void spu_evnt_swap(unsigned long data)
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int cur_phys_spu, nxt_phys_spu, cur_spu_evnt_phys_spu_indx;
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/* enable interrupts on cntr 0 */
605
interrupt_mask = CBE_PM_CTR_OVERFLOW_INTR(0);
609
/* Make sure spu event interrupt handler and spu event swap
610
* don't access the counters simultaneously.
612
spin_lock_irqsave(&cntr_lock, flags);
614
cur_spu_evnt_phys_spu_indx = spu_evnt_phys_spu_indx;
616
if (++(spu_evnt_phys_spu_indx) == NUM_SPUS_PER_NODE)
617
spu_evnt_phys_spu_indx = 0;
619
pm_signal[0].sub_unit = spu_evnt_phys_spu_indx;
620
pm_signal[1].sub_unit = spu_evnt_phys_spu_indx;
621
pm_signal[2].sub_unit = spu_evnt_phys_spu_indx;
623
/* switch the SPU being profiled on each node */
624
for_each_online_cpu(cpu) {
625
if (cbe_get_hw_thread_id(cpu))
628
node = cbe_cpu_to_node(cpu);
629
cur_phys_spu = (node * NUM_SPUS_PER_NODE)
630
+ cur_spu_evnt_phys_spu_indx;
631
nxt_phys_spu = (node * NUM_SPUS_PER_NODE)
632
+ spu_evnt_phys_spu_indx;
635
* stop counters, save counter values, restore counts
636
* for previous physical SPU
639
cbe_disable_pm_interrupts(cpu);
641
spu_pm_cnt[cur_phys_spu]
642
= cbe_read_ctr(cpu, 0);
644
/* restore previous count for the next spu to sample */
645
/* NOTE, hardware issue, counter will not start if the
646
* counter value is at max (0xFFFFFFFF).
648
if (spu_pm_cnt[nxt_phys_spu] >= 0xFFFFFFFF)
649
cbe_write_ctr(cpu, 0, 0xFFFFFFF0);
651
cbe_write_ctr(cpu, 0, spu_pm_cnt[nxt_phys_spu]);
653
pm_rtas_reset_signals(cbe_cpu_to_node(cpu));
655
/* setup the debug bus measure the one event and
656
* the two events to route the next SPU's PC on
659
ret = pm_rtas_activate_signals(cbe_cpu_to_node(cpu), 3);
661
printk(KERN_ERR "%s: pm_rtas_activate_signals failed, "
662
"SPU event swap\n", __func__);
664
/* clear the trace buffer, don't want to take PC for
666
cbe_write_pm(cpu, trace_address, 0);
668
enable_ctr(cpu, 0, pm_regs.pm07_cntrl);
670
/* Enable interrupts on the CPU thread that is starting */
671
cbe_enable_pm_interrupts(cpu, hdw_thread,
676
spin_unlock_irqrestore(&cntr_lock, flags);
678
/* swap approximately every 0.1 seconds */
679
mod_timer(&timer_spu_event_swap, jiffies + HZ / 25);
682
static void start_spu_event_swap(void)
684
init_timer(&timer_spu_event_swap);
685
timer_spu_event_swap.function = spu_evnt_swap;
686
timer_spu_event_swap.data = 0UL;
687
timer_spu_event_swap.expires = jiffies + HZ / 25;
688
add_timer(&timer_spu_event_swap);
691
static int cell_reg_setup_spu_events(struct op_counter_config *ctr,
692
struct op_system_config *sys, int num_ctrs)
696
/* routine is called once for all nodes */
698
spu_evnt_phys_spu_indx = 0;
700
* For all events except PPU CYCLEs, each node will need to make
701
* the rtas cbe-perftools call to setup and reset the debug bus.
702
* Make the token lookup call once and store it in the global
703
* variable pm_rtas_token.
705
pm_rtas_token = rtas_token("ibm,cbe-perftools");
707
if (unlikely(pm_rtas_token == RTAS_UNKNOWN_SERVICE)) {
709
"%s: rtas token ibm,cbe-perftools unknown\n",
714
/* setup the pm_control register settings,
715
* settings will be written per node by the
716
* cell_cpu_setup() function.
718
pm_regs.pm_cntrl.trace_buf_ovflw = 1;
720
/* Use the occurrence trace mode to have SPU PC saved
721
* to the trace buffer. Occurrence data in trace buffer
722
* is not used. Bit 2 must be set to store SPU addresses.
724
pm_regs.pm_cntrl.trace_mode = 2;
726
pm_regs.pm_cntrl.spu_addr_trace = 0x1; /* using debug bus
729
/* setup the debug bus event array with the SPU PC routing events.
730
* Note, pm_signal[0] will be filled in by set_pm_event() call below.
732
pm_signal[1].signal_group = SPU_PROFILE_EVENT_ADDR / 100;
733
pm_signal[1].bus_word = GET_BUS_WORD(SPU_PROFILE_EVENT_ADDR_MASK_A);
734
pm_signal[1].bit = SPU_PROFILE_EVENT_ADDR % 100;
735
pm_signal[1].sub_unit = spu_evnt_phys_spu_indx;
737
pm_signal[2].signal_group = SPU_PROFILE_EVENT_ADDR / 100;
738
pm_signal[2].bus_word = GET_BUS_WORD(SPU_PROFILE_EVENT_ADDR_MASK_B);
739
pm_signal[2].bit = SPU_PROFILE_EVENT_ADDR % 100;
740
pm_signal[2].sub_unit = spu_evnt_phys_spu_indx;
742
/* Set the user selected spu event to profile on,
743
* note, only one SPU profiling event is supported
745
num_counters = 1; /* Only support one SPU event at a time */
746
set_pm_event(0, ctr[0].event, ctr[0].unit_mask);
748
reset_value[0] = 0xFFFFFFFF - ctr[0].count;
750
/* global, used by cell_cpu_setup */
753
/* Initialize the count for each SPU to the reset value */
754
for (i=0; i < MAX_NUMNODES * NUM_SPUS_PER_NODE; i++)
755
spu_pm_cnt[i] = reset_value[0];
760
static int cell_reg_setup_ppu(struct op_counter_config *ctr,
761
struct op_system_config *sys, int num_ctrs)
763
/* routine is called once for all nodes */
766
num_counters = num_ctrs;
768
if (unlikely(num_ctrs > NR_PHYS_CTRS)) {
770
"%s: Oprofile, number of specified events " \
771
"exceeds number of physical counters\n",
776
set_count_mode(sys->enable_kernel, sys->enable_user);
778
/* Setup the thread 0 events */
779
for (i = 0; i < num_ctrs; ++i) {
781
pmc_cntrl[0][i].evnts = ctr[i].event;
782
pmc_cntrl[0][i].masks = ctr[i].unit_mask;
783
pmc_cntrl[0][i].enabled = ctr[i].enabled;
784
pmc_cntrl[0][i].vcntr = i;
786
for_each_possible_cpu(j)
787
per_cpu(pmc_values, j)[i] = 0;
791
* Setup the thread 1 events, map the thread 0 event to the
792
* equivalent thread 1 event.
794
for (i = 0; i < num_ctrs; ++i) {
795
if ((ctr[i].event >= 2100) && (ctr[i].event <= 2111))
796
pmc_cntrl[1][i].evnts = ctr[i].event + 19;
797
else if (ctr[i].event == 2203)
798
pmc_cntrl[1][i].evnts = ctr[i].event;
799
else if ((ctr[i].event >= 2200) && (ctr[i].event <= 2215))
800
pmc_cntrl[1][i].evnts = ctr[i].event + 16;
802
pmc_cntrl[1][i].evnts = ctr[i].event;
804
pmc_cntrl[1][i].masks = ctr[i].unit_mask;
805
pmc_cntrl[1][i].enabled = ctr[i].enabled;
806
pmc_cntrl[1][i].vcntr = i;
809
for (i = 0; i < NUM_INPUT_BUS_WORDS; i++)
813
* Our counters count up, and "count" refers to
814
* how much before the next interrupt, and we interrupt
815
* on overflow. So we calculate the starting value
816
* which will give us "count" until overflow.
817
* Then we set the events on the enabled counters.
819
for (i = 0; i < num_counters; ++i) {
820
/* start with virtual counter set 0 */
821
if (pmc_cntrl[0][i].enabled) {
822
/* Using 32bit counters, reset max - count */
823
reset_value[i] = 0xFFFFFFFF - ctr[i].count;
825
pmc_cntrl[0][i].evnts,
826
pmc_cntrl[0][i].masks);
828
/* global, used by cell_cpu_setup */
829
ctr_enabled |= (1 << i);
833
/* initialize the previous counts for the virtual cntrs */
834
for_each_online_cpu(cpu)
835
for (i = 0; i < num_counters; ++i) {
836
per_cpu(pmc_values, cpu)[i] = reset_value[i];
843
/* This function is called once for all cpus combined */
844
static int cell_reg_setup(struct op_counter_config *ctr,
845
struct op_system_config *sys, int num_ctrs)
850
/* initialize the spu_arr_trace value, will be reset if
851
* doing spu event profiling.
853
pm_regs.group_control = 0;
854
pm_regs.debug_bus_control = 0;
855
pm_regs.pm_cntrl.stop_at_max = 1;
856
pm_regs.pm_cntrl.trace_mode = 0;
857
pm_regs.pm_cntrl.freeze = 1;
858
pm_regs.pm_cntrl.trace_buf_ovflw = 0;
859
pm_regs.pm_cntrl.spu_addr_trace = 0;
862
* For all events except PPU CYCLEs, each node will need to make
863
* the rtas cbe-perftools call to setup and reset the debug bus.
864
* Make the token lookup call once and store it in the global
865
* variable pm_rtas_token.
867
pm_rtas_token = rtas_token("ibm,cbe-perftools");
869
if (unlikely(pm_rtas_token == RTAS_UNKNOWN_SERVICE)) {
871
"%s: rtas token ibm,cbe-perftools unknown\n",
876
if (ctr[0].event == SPU_CYCLES_EVENT_NUM) {
877
profiling_mode = SPU_PROFILING_CYCLES;
878
ret = cell_reg_setup_spu_cycles(ctr, sys, num_ctrs);
879
} else if ((ctr[0].event >= SPU_EVENT_NUM_START) &&
880
(ctr[0].event <= SPU_EVENT_NUM_STOP)) {
881
profiling_mode = SPU_PROFILING_EVENTS;
882
spu_cycle_reset = ctr[0].count;
884
/* for SPU event profiling, need to setup the
885
* pm_signal array with the events to route the
886
* SPU PC before making the FW call. Note, only
887
* one SPU event for profiling can be specified
890
cell_reg_setup_spu_events(ctr, sys, num_ctrs);
892
profiling_mode = PPU_PROFILING;
893
ret = cell_reg_setup_ppu(ctr, sys, num_ctrs);
901
/* This function is called once for each cpu */
902
static int cell_cpu_setup(struct op_counter_config *cntr)
904
u32 cpu = smp_processor_id();
909
/* Cycle based SPU profiling does not use the performance
910
* counters. The trace array is configured to collect
913
if (profiling_mode == SPU_PROFILING_CYCLES)
916
/* There is one performance monitor per processor chip (i.e. node),
917
* so we only need to perform this function once per node.
919
if (cbe_get_hw_thread_id(cpu))
922
/* Stop all counters */
924
cbe_disable_pm_interrupts(cpu);
926
cbe_write_pm(cpu, pm_start_stop, 0);
927
cbe_write_pm(cpu, group_control, pm_regs.group_control);
928
cbe_write_pm(cpu, debug_bus_control, pm_regs.debug_bus_control);
931
for (i = 0; i < num_counters; ++i) {
932
if (ctr_enabled & (1 << i)) {
933
pm_signal[num_enabled].cpu = cbe_cpu_to_node(cpu);
939
* The pm_rtas_activate_signals will return -EIO if the FW
942
if (profiling_mode == SPU_PROFILING_EVENTS) {
943
/* For SPU event profiling also need to setup the
946
ret = pm_rtas_activate_signals(cbe_cpu_to_node(cpu),
948
/* store PC from debug bus to Trace buffer as often
949
* as possible (every 10 cycles)
951
cbe_write_pm(cpu, pm_interval, NUM_INTERVAL_CYC);
954
return pm_rtas_activate_signals(cbe_cpu_to_node(cpu),
959
#define MAXLFSR 0xFFFFFF
961
/* precomputed table of 24 bit LFSR values */
962
static int initial_lfsr[] = {
963
8221349, 12579195, 5379618, 10097839, 7512963, 7519310, 3955098, 10753424,
964
15507573, 7458917, 285419, 2641121, 9780088, 3915503, 6668768, 1548716,
965
4885000, 8774424, 9650099, 2044357, 2304411, 9326253, 10332526, 4421547,
966
3440748, 10179459, 13332843, 10375561, 1313462, 8375100, 5198480, 6071392,
967
9341783, 1526887, 3985002, 1439429, 13923762, 7010104, 11969769, 4547026,
968
2040072, 4025602, 3437678, 7939992, 11444177, 4496094, 9803157, 10745556,
969
3671780, 4257846, 5662259, 13196905, 3237343, 12077182, 16222879, 7587769,
970
14706824, 2184640, 12591135, 10420257, 7406075, 3648978, 11042541, 15906893,
971
11914928, 4732944, 10695697, 12928164, 11980531, 4430912, 11939291, 2917017,
972
6119256, 4172004, 9373765, 8410071, 14788383, 5047459, 5474428, 1737756,
973
15967514, 13351758, 6691285, 8034329, 2856544, 14394753, 11310160, 12149558,
974
7487528, 7542781, 15668898, 12525138, 12790975, 3707933, 9106617, 1965401,
975
16219109, 12801644, 2443203, 4909502, 8762329, 3120803, 6360315, 9309720,
976
15164599, 10844842, 4456529, 6667610, 14924259, 884312, 6234963, 3326042,
977
15973422, 13919464, 5272099, 6414643, 3909029, 2764324, 5237926, 4774955,
978
10445906, 4955302, 5203726, 10798229, 11443419, 2303395, 333836, 9646934,
979
3464726, 4159182, 568492, 995747, 10318756, 13299332, 4836017, 8237783,
980
3878992, 2581665, 11394667, 5672745, 14412947, 3159169, 9094251, 16467278,
981
8671392, 15230076, 4843545, 7009238, 15504095, 1494895, 9627886, 14485051,
982
8304291, 252817, 12421642, 16085736, 4774072, 2456177, 4160695, 15409741,
983
4902868, 5793091, 13162925, 16039714, 782255, 11347835, 14884586, 366972,
984
16308990, 11913488, 13390465, 2958444, 10340278, 1177858, 1319431, 10426302,
985
2868597, 126119, 5784857, 5245324, 10903900, 16436004, 3389013, 1742384,
986
14674502, 10279218, 8536112, 10364279, 6877778, 14051163, 1025130, 6072469,
987
1988305, 8354440, 8216060, 16342977, 13112639, 3976679, 5913576, 8816697,
988
6879995, 14043764, 3339515, 9364420, 15808858, 12261651, 2141560, 5636398,
989
10345425, 10414756, 781725, 6155650, 4746914, 5078683, 7469001, 6799140,
990
10156444, 9667150, 10116470, 4133858, 2121972, 1124204, 1003577, 1611214,
991
14304602, 16221850, 13878465, 13577744, 3629235, 8772583, 10881308, 2410386,
992
7300044, 5378855, 9301235, 12755149, 4977682, 8083074, 10327581, 6395087,
993
9155434, 15501696, 7514362, 14520507, 15808945, 3244584, 4741962, 9658130,
994
14336147, 8654727, 7969093, 15759799, 14029445, 5038459, 9894848, 8659300,
995
13699287, 8834306, 10712885, 14753895, 10410465, 3373251, 309501, 9561475,
996
5526688, 14647426, 14209836, 5339224, 207299, 14069911, 8722990, 2290950,
997
3258216, 12505185, 6007317, 9218111, 14661019, 10537428, 11731949, 9027003,
998
6641507, 9490160, 200241, 9720425, 16277895, 10816638, 1554761, 10431375,
999
7467528, 6790302, 3429078, 14633753, 14428997, 11463204, 3576212, 2003426,
1000
6123687, 820520, 9992513, 15784513, 5778891, 6428165, 8388607
1004
* The hardware uses an LFSR counting sequence to determine when to capture
1005
* the SPU PCs. An LFSR sequence is like a puesdo random number sequence
1006
* where each number occurs once in the sequence but the sequence is not in
1007
* numerical order. The SPU PC capture is done when the LFSR sequence reaches
1008
* the last value in the sequence. Hence the user specified value N
1009
* corresponds to the LFSR number that is N from the end of the sequence.
1011
* To avoid the time to compute the LFSR, a lookup table is used. The 24 bit
1012
* LFSR sequence is broken into four ranges. The spacing of the precomputed
1013
* values is adjusted in each range so the error between the user specifed
1014
* number (N) of events between samples and the actual number of events based
1015
* on the precomputed value will be les then about 6.2%. Note, if the user
1016
* specifies N < 2^16, the LFSR value that is 2^16 from the end will be used.
1017
* This is to prevent the loss of samples because the trace buffer is full.
1019
* User specified N Step between Index in
1020
* precomputed values precomputed
1022
* 0 to 2^16-1 ---- 0
1023
* 2^16 to 2^16+2^19-1 2^12 1 to 128
1024
* 2^16+2^19 to 2^16+2^19+2^22-1 2^15 129 to 256
1025
* 2^16+2^19+2^22 to 2^24-1 2^18 257 to 302
1028
* For example, the LFSR values in the second range are computed for 2^16,
1029
* 2^16+2^12, ... , 2^19-2^16, 2^19 and stored in the table at indicies
1030
* 1, 2,..., 127, 128.
1032
* The 24 bit LFSR value for the nth number in the sequence can be
1033
* calculated using the following code:
1036
* int calculate_lfsr(int n)
1039
* unsigned int newlfsr0;
1040
* unsigned int lfsr = 0xFFFFFF;
1041
* unsigned int howmany = n;
1043
* for (i = 2; i < howmany + 2; i++) {
1044
* newlfsr0 = (((lfsr >> (size - 1 - 0)) & 1) ^
1045
* ((lfsr >> (size - 1 - 1)) & 1) ^
1046
* (((lfsr >> (size - 1 - 6)) & 1) ^
1047
* ((lfsr >> (size - 1 - 23)) & 1)));
1050
* lfsr = lfsr | (newlfsr0 << (size - 1));
1056
#define V2_16 (0x1 << 16)
1057
#define V2_19 (0x1 << 19)
1058
#define V2_22 (0x1 << 22)
1060
static int calculate_lfsr(int n)
1063
* The ranges and steps are in powers of 2 so the calculations
1064
* can be done using shifts rather then divide.
1070
else if (((n - V2_16) >> 19) == 0)
1071
index = ((n - V2_16) >> 12) + 1;
1072
else if (((n - V2_16 - V2_19) >> 22) == 0)
1073
index = ((n - V2_16 - V2_19) >> 15 ) + 1 + 128;
1074
else if (((n - V2_16 - V2_19 - V2_22) >> 24) == 0)
1075
index = ((n - V2_16 - V2_19 - V2_22) >> 18 ) + 1 + 256;
1079
/* make sure index is valid */
1080
if ((index >= ENTRIES) || (index < 0))
1083
return initial_lfsr[index];
1086
static int pm_rtas_activate_spu_profiling(u32 node)
1089
struct pm_signal pm_signal_local[NUM_SPUS_PER_NODE];
1092
* Set up the rtas call to configure the debug bus to
1093
* route the SPU PCs. Setup the pm_signal for each SPU
1095
for (i = 0; i < ARRAY_SIZE(pm_signal_local); i++) {
1096
pm_signal_local[i].cpu = node;
1097
pm_signal_local[i].signal_group = 41;
1098
/* spu i on word (i/2) */
1099
pm_signal_local[i].bus_word = 1 << i / 2;
1101
pm_signal_local[i].sub_unit = i;
1102
pm_signal_local[i].bit = 63;
1105
ret = rtas_ibm_cbe_perftools(SUBFUNC_ACTIVATE,
1106
PASSTHRU_ENABLE, pm_signal_local,
1107
(ARRAY_SIZE(pm_signal_local)
1108
* sizeof(struct pm_signal)));
1110
if (unlikely(ret)) {
1111
printk(KERN_WARNING "%s: rtas returned: %d\n",
1119
#ifdef CONFIG_CPU_FREQ
1121
oprof_cpufreq_notify(struct notifier_block *nb, unsigned long val, void *data)
1124
struct cpufreq_freqs *frq = data;
1125
if ((val == CPUFREQ_PRECHANGE && frq->old < frq->new) ||
1126
(val == CPUFREQ_POSTCHANGE && frq->old > frq->new) ||
1127
(val == CPUFREQ_RESUMECHANGE || val == CPUFREQ_SUSPENDCHANGE))
1128
set_spu_profiling_frequency(frq->new, spu_cycle_reset);
1132
static struct notifier_block cpu_freq_notifier_block = {
1133
.notifier_call = oprof_cpufreq_notify
1138
* Note the generic OProfile stop calls do not support returning
1139
* an error on stop. Hence, will not return an error if the FW
1140
* calls fail on stop. Failure to reset the debug bus is not an issue.
1141
* Failure to disable the SPU profiling is not an issue. The FW calls
1142
* to enable the performance counters and debug bus will work even if
1143
* the hardware was not cleanly reset.
1145
static void cell_global_stop_spu_cycles(void)
1147
int subfunc, rtn_value;
1148
unsigned int lfsr_value;
1151
oprofile_running = 0;
1154
#ifdef CONFIG_CPU_FREQ
1155
cpufreq_unregister_notifier(&cpu_freq_notifier_block,
1156
CPUFREQ_TRANSITION_NOTIFIER);
1159
for_each_online_cpu(cpu) {
1160
if (cbe_get_hw_thread_id(cpu))
1164
* 2 - activate SPU tracing,
1167
lfsr_value = 0x8f100000;
1169
rtn_value = rtas_call(spu_rtas_token, 3, 1, NULL,
1170
subfunc, cbe_cpu_to_node(cpu),
1173
if (unlikely(rtn_value != 0)) {
1175
"%s: rtas call ibm,cbe-spu-perftools " \
1176
"failed, return = %d\n",
1177
__func__, rtn_value);
1180
/* Deactivate the signals */
1181
pm_rtas_reset_signals(cbe_cpu_to_node(cpu));
1184
stop_spu_profiling_cycles();
1187
static void cell_global_stop_spu_events(void)
1190
oprofile_running = 0;
1192
stop_spu_profiling_events();
1195
for_each_online_cpu(cpu) {
1196
if (cbe_get_hw_thread_id(cpu))
1199
cbe_sync_irq(cbe_cpu_to_node(cpu));
1200
/* Stop the counters */
1201
cbe_disable_pm(cpu);
1202
cbe_write_pm07_control(cpu, 0, 0);
1204
/* Deactivate the signals */
1205
pm_rtas_reset_signals(cbe_cpu_to_node(cpu));
1207
/* Deactivate interrupts */
1208
cbe_disable_pm_interrupts(cpu);
1210
del_timer_sync(&timer_spu_event_swap);
1213
static void cell_global_stop_ppu(void)
1218
* This routine will be called once for the system.
1219
* There is one performance monitor per node, so we
1220
* only need to perform this function once per node.
1222
del_timer_sync(&timer_virt_cntr);
1223
oprofile_running = 0;
1226
for_each_online_cpu(cpu) {
1227
if (cbe_get_hw_thread_id(cpu))
1230
cbe_sync_irq(cbe_cpu_to_node(cpu));
1231
/* Stop the counters */
1232
cbe_disable_pm(cpu);
1234
/* Deactivate the signals */
1235
pm_rtas_reset_signals(cbe_cpu_to_node(cpu));
1237
/* Deactivate interrupts */
1238
cbe_disable_pm_interrupts(cpu);
1242
static void cell_global_stop(void)
1244
if (profiling_mode == PPU_PROFILING)
1245
cell_global_stop_ppu();
1246
else if (profiling_mode == SPU_PROFILING_EVENTS)
1247
cell_global_stop_spu_events();
1249
cell_global_stop_spu_cycles();
1252
static int cell_global_start_spu_cycles(struct op_counter_config *ctr)
1255
unsigned int lfsr_value;
1259
unsigned int cpu_khzfreq = 0;
1261
/* The SPU profiling uses time-based profiling based on
1262
* cpu frequency, so if configured with the CPU_FREQ
1263
* option, we should detect frequency changes and react
1266
#ifdef CONFIG_CPU_FREQ
1267
ret = cpufreq_register_notifier(&cpu_freq_notifier_block,
1268
CPUFREQ_TRANSITION_NOTIFIER);
1270
/* this is not a fatal error */
1271
printk(KERN_ERR "CPU freq change registration failed: %d\n",
1275
cpu_khzfreq = cpufreq_quick_get(smp_processor_id());
1278
set_spu_profiling_frequency(cpu_khzfreq, spu_cycle_reset);
1280
for_each_online_cpu(cpu) {
1281
if (cbe_get_hw_thread_id(cpu))
1285
* Setup SPU cycle-based profiling.
1286
* Set perf_mon_control bit 0 to a zero before
1287
* enabling spu collection hardware.
1289
cbe_write_pm(cpu, pm_control, 0);
1291
if (spu_cycle_reset > MAX_SPU_COUNT)
1292
/* use largest possible value */
1293
lfsr_value = calculate_lfsr(MAX_SPU_COUNT-1);
1295
lfsr_value = calculate_lfsr(spu_cycle_reset);
1297
/* must use a non zero value. Zero disables data collection. */
1298
if (lfsr_value == 0)
1299
lfsr_value = calculate_lfsr(1);
1301
lfsr_value = lfsr_value << 8; /* shift lfsr to correct
1305
/* debug bus setup */
1306
ret = pm_rtas_activate_spu_profiling(cbe_cpu_to_node(cpu));
1308
if (unlikely(ret)) {
1314
subfunc = 2; /* 2 - activate SPU tracing, 3 - deactivate */
1316
/* start profiling */
1317
ret = rtas_call(spu_rtas_token, 3, 1, NULL, subfunc,
1318
cbe_cpu_to_node(cpu), lfsr_value);
1320
if (unlikely(ret != 0)) {
1322
"%s: rtas call ibm,cbe-spu-perftools failed, " \
1323
"return = %d\n", __func__, ret);
1329
rtas_error = start_spu_profiling_cycles(spu_cycle_reset);
1333
oprofile_running = 1;
1337
cell_global_stop_spu_cycles(); /* clean up the PMU/debug bus */
1342
static int cell_global_start_spu_events(struct op_counter_config *ctr)
1345
u32 interrupt_mask = 0;
1350
/* spu event profiling, uses the performance counters to generate
1351
* an interrupt. The hardware is setup to store the SPU program
1352
* counter into the trace array. The occurrence mode is used to
1353
* enable storing data to the trace buffer. The bits are set
1354
* to send/store the SPU address in the trace buffer. The debug
1355
* bus must be setup to route the SPU program counter onto the
1356
* debug bus. The occurrence data in the trace buffer is not used.
1359
/* This routine gets called once for the system.
1360
* There is one performance monitor per node, so we
1361
* only need to perform this function once per node.
1364
for_each_online_cpu(cpu) {
1365
if (cbe_get_hw_thread_id(cpu))
1369
* Setup SPU event-based profiling.
1370
* Set perf_mon_control bit 0 to a zero before
1371
* enabling spu collection hardware.
1373
* Only support one SPU event on one SPU per node.
1375
if (ctr_enabled & 1) {
1376
cbe_write_ctr(cpu, 0, reset_value[0]);
1377
enable_ctr(cpu, 0, pm_regs.pm07_cntrl);
1379
CBE_PM_CTR_OVERFLOW_INTR(0);
1381
/* Disable counter */
1382
cbe_write_pm07_control(cpu, 0, 0);
1385
cbe_get_and_clear_pm_interrupts(cpu);
1386
cbe_enable_pm_interrupts(cpu, hdw_thread, interrupt_mask);
1389
/* clear the trace buffer */
1390
cbe_write_pm(cpu, trace_address, 0);
1393
/* Start the timer to time slice collecting the event profile
1394
* on each of the SPUs. Note, can collect profile on one SPU
1395
* per node at a time.
1397
start_spu_event_swap();
1398
start_spu_profiling_events();
1399
oprofile_running = 1;
1405
static int cell_global_start_ppu(struct op_counter_config *ctr)
1408
u32 interrupt_mask = 0;
1410
/* This routine gets called once for the system.
1411
* There is one performance monitor per node, so we
1412
* only need to perform this function once per node.
1414
for_each_online_cpu(cpu) {
1415
if (cbe_get_hw_thread_id(cpu))
1420
for (i = 0; i < num_counters; ++i) {
1421
if (ctr_enabled & (1 << i)) {
1422
cbe_write_ctr(cpu, i, reset_value[i]);
1423
enable_ctr(cpu, i, pm_regs.pm07_cntrl);
1424
interrupt_mask |= CBE_PM_CTR_OVERFLOW_INTR(i);
1426
/* Disable counter */
1427
cbe_write_pm07_control(cpu, i, 0);
1431
cbe_get_and_clear_pm_interrupts(cpu);
1432
cbe_enable_pm_interrupts(cpu, hdw_thread, interrupt_mask);
1436
virt_cntr_inter_mask = interrupt_mask;
1437
oprofile_running = 1;
1441
* NOTE: start_virt_cntrs will result in cell_virtual_cntr() being
1442
* executed which manipulates the PMU. We start the "virtual counter"
1443
* here so that we do not need to synchronize access to the PMU in
1444
* the above for-loop.
1451
static int cell_global_start(struct op_counter_config *ctr)
1453
if (profiling_mode == SPU_PROFILING_CYCLES)
1454
return cell_global_start_spu_cycles(ctr);
1455
else if (profiling_mode == SPU_PROFILING_EVENTS)
1456
return cell_global_start_spu_events(ctr);
1458
return cell_global_start_ppu(ctr);
1462
/* The SPU interrupt handler
1464
* SPU event profiling works as follows:
1465
* The pm_signal[0] holds the one SPU event to be measured. It is routed on
1466
* the debug bus using word 0 or 1. The value of pm_signal[1] and
1467
* pm_signal[2] contain the necessary events to route the SPU program
1468
* counter for the selected SPU onto the debug bus using words 2 and 3.
1469
* The pm_interval register is setup to write the SPU PC value into the
1470
* trace buffer at the maximum rate possible. The trace buffer is configured
1471
* to store the PCs, wrapping when it is full. The performance counter is
1472
* initialized to the max hardware count minus the number of events, N, between
1473
* samples. Once the N events have occurred, a HW counter overflow occurs
1474
* causing the generation of a HW counter interrupt which also stops the
1475
* writing of the SPU PC values to the trace buffer. Hence the last PC
1476
* written to the trace buffer is the SPU PC that we want. Unfortunately,
1477
* we have to read from the beginning of the trace buffer to get to the
1478
* last value written. We just hope the PPU has nothing better to do then
1479
* service this interrupt. The PC for the specific SPU being profiled is
1480
* extracted from the trace buffer processed and stored. The trace buffer
1481
* is cleared, interrupts are cleared, the counter is reset to max - N.
1482
* A kernel timer is used to periodically call the routine spu_evnt_swap()
1483
* to switch to the next physical SPU in the node to profile in round robbin
1484
* order. This way data is collected for all SPUs on the node. It does mean
1485
* that we need to use a relatively small value of N to ensure enough samples
1486
* on each SPU are collected each SPU is being profiled 1/8 of the time.
1487
* It may also be necessary to use a longer sample collection period.
1489
static void cell_handle_interrupt_spu(struct pt_regs *regs,
1490
struct op_counter_config *ctr)
1495
u64 trace_buffer[2];
1496
u64 last_trace_buffer;
1499
unsigned long sample_array_lock_flags;
1501
unsigned long flags;
1503
/* Make sure spu event interrupt handler and spu event swap
1504
* don't access the counters simultaneously.
1506
cpu = smp_processor_id();
1507
spin_lock_irqsave(&cntr_lock, flags);
1510
cbe_disable_pm(cpu);
1512
interrupt_mask = cbe_get_and_clear_pm_interrupts(cpu);
1515
trace_entry = 0xfedcba;
1516
last_trace_buffer = 0xdeadbeaf;
1518
if ((oprofile_running == 1) && (interrupt_mask != 0)) {
1519
/* disable writes to trace buff */
1520
cbe_write_pm(cpu, pm_interval, 0);
1522
/* only have one perf cntr being used, cntr 0 */
1523
if ((interrupt_mask & CBE_PM_CTR_OVERFLOW_INTR(0))
1525
/* The SPU PC values will be read
1526
* from the trace buffer, reset counter
1529
cbe_write_ctr(cpu, 0, reset_value[0]);
1531
trace_addr = cbe_read_pm(cpu, trace_address);
1533
while (!(trace_addr & CBE_PM_TRACE_BUF_EMPTY)) {
1534
/* There is data in the trace buffer to process
1535
* Read the buffer until you get to the last
1536
* entry. This is the value we want.
1539
cbe_read_trace_buffer(cpu, trace_buffer);
1540
trace_addr = cbe_read_pm(cpu, trace_address);
1543
/* SPU Address 16 bit count format for 128 bit
1544
* HW trace buffer is used for the SPU PC storage
1546
* SPU Addr 0 bits 16:31
1547
* SPU Addr 1 bits 32:47
1548
* unused bits 48:127
1550
* HDR: bit4 = 1 SPU Address 0 valid
1551
* HDR: bit5 = 1 SPU Address 1 valid
1552
* - unfortunately, the valid bits don't seem to work
1554
* Note trace_buffer[0] holds bits 0:63 of the HW
1555
* trace buffer, trace_buffer[1] holds bits 64:127
1558
trace_entry = trace_buffer[0]
1559
& 0x00000000FFFF0000;
1561
/* only top 16 of the 18 bit SPU PC address
1562
* is stored in trace buffer, hence shift right
1564
sample = trace_entry >> 14;
1565
last_trace_buffer = trace_buffer[0];
1567
spu_num = spu_evnt_phys_spu_indx
1568
+ (cbe_cpu_to_node(cpu) * NUM_SPUS_PER_NODE);
1570
/* make sure only one process at a time is calling
1573
spin_lock_irqsave(&oprof_spu_smpl_arry_lck,
1574
sample_array_lock_flags);
1575
spu_sync_buffer(spu_num, &sample, 1);
1576
spin_unlock_irqrestore(&oprof_spu_smpl_arry_lck,
1577
sample_array_lock_flags);
1579
smp_wmb(); /* insure spu event buffer updates are written
1580
* don't want events intermingled... */
1582
/* The counters were frozen by the interrupt.
1583
* Reenable the interrupt and restart the counters.
1585
cbe_write_pm(cpu, pm_interval, NUM_INTERVAL_CYC);
1586
cbe_enable_pm_interrupts(cpu, hdw_thread,
1587
virt_cntr_inter_mask);
1589
/* clear the trace buffer, re-enable writes to trace buff */
1590
cbe_write_pm(cpu, trace_address, 0);
1591
cbe_write_pm(cpu, pm_interval, NUM_INTERVAL_CYC);
1593
/* The writes to the various performance counters only writes
1594
* to a latch. The new values (interrupt setting bits, reset
1595
* counter value etc.) are not copied to the actual registers
1596
* until the performance monitor is enabled. In order to get
1597
* this to work as desired, the performance monitor needs to
1598
* be disabled while writing to the latches. This is a
1601
write_pm_cntrl(cpu);
1604
spin_unlock_irqrestore(&cntr_lock, flags);
1607
static void cell_handle_interrupt_ppu(struct pt_regs *regs,
1608
struct op_counter_config *ctr)
1613
unsigned long flags = 0;
1617
cpu = smp_processor_id();
1620
* Need to make sure the interrupt handler and the virt counter
1621
* routine are not running at the same time. See the
1622
* cell_virtual_cntr() routine for additional comments.
1624
spin_lock_irqsave(&cntr_lock, flags);
1627
* Need to disable and reenable the performance counters
1628
* to get the desired behavior from the hardware. This
1629
* is hardware specific.
1632
cbe_disable_pm(cpu);
1634
interrupt_mask = cbe_get_and_clear_pm_interrupts(cpu);
1637
* If the interrupt mask has been cleared, then the virt cntr
1638
* has cleared the interrupt. When the thread that generated
1639
* the interrupt is restored, the data count will be restored to
1640
* 0xffffff0 to cause the interrupt to be regenerated.
1643
if ((oprofile_running == 1) && (interrupt_mask != 0)) {
1645
is_kernel = is_kernel_addr(pc);
1647
for (i = 0; i < num_counters; ++i) {
1648
if ((interrupt_mask & CBE_PM_CTR_OVERFLOW_INTR(i))
1649
&& ctr[i].enabled) {
1650
oprofile_add_ext_sample(pc, regs, i, is_kernel);
1651
cbe_write_ctr(cpu, i, reset_value[i]);
1656
* The counters were frozen by the interrupt.
1657
* Reenable the interrupt and restart the counters.
1658
* If there was a race between the interrupt handler and
1659
* the virtual counter routine. The virtual counter
1660
* routine may have cleared the interrupts. Hence must
1661
* use the virt_cntr_inter_mask to re-enable the interrupts.
1663
cbe_enable_pm_interrupts(cpu, hdw_thread,
1664
virt_cntr_inter_mask);
1667
* The writes to the various performance counters only writes
1668
* to a latch. The new values (interrupt setting bits, reset
1669
* counter value etc.) are not copied to the actual registers
1670
* until the performance monitor is enabled. In order to get
1671
* this to work as desired, the performance monitor needs to
1672
* be disabled while writing to the latches. This is a
1677
spin_unlock_irqrestore(&cntr_lock, flags);
1680
static void cell_handle_interrupt(struct pt_regs *regs,
1681
struct op_counter_config *ctr)
1683
if (profiling_mode == PPU_PROFILING)
1684
cell_handle_interrupt_ppu(regs, ctr);
1686
cell_handle_interrupt_spu(regs, ctr);
1690
* This function is called from the generic OProfile
1691
* driver. When profiling PPUs, we need to do the
1692
* generic sync start; otherwise, do spu_sync_start.
1694
static int cell_sync_start(void)
1696
if ((profiling_mode == SPU_PROFILING_CYCLES) ||
1697
(profiling_mode == SPU_PROFILING_EVENTS))
1698
return spu_sync_start();
1700
return DO_GENERIC_SYNC;
1703
static int cell_sync_stop(void)
1705
if ((profiling_mode == SPU_PROFILING_CYCLES) ||
1706
(profiling_mode == SPU_PROFILING_EVENTS))
1707
return spu_sync_stop();
1712
struct op_powerpc_model op_model_cell = {
1713
.reg_setup = cell_reg_setup,
1714
.cpu_setup = cell_cpu_setup,
1715
.global_start = cell_global_start,
1716
.global_stop = cell_global_stop,
1717
.sync_start = cell_sync_start,
1718
.sync_stop = cell_sync_stop,
1719
.handle_interrupt = cell_handle_interrupt,