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1213 lines
34 KiB
1213 lines
34 KiB
/*
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* Cell Broadband Engine OProfile Support
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*
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* (C) Copyright IBM Corporation 2006
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*
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* Author: David Erb (djerb@us.ibm.com)
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* Modifications:
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* Carl Love <carll@us.ibm.com>
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* Maynard Johnson <maynardj@us.ibm.com>
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*
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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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*/
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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/io.h>
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#include <asm/oprofile_impl.h>
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#include <asm/processor.h>
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#include <asm/prom.h>
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#include <asm/ptrace.h>
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#include <asm/reg.h>
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#include <asm/rtas.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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static void cell_global_stop_spu(void);
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/*
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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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*/
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static unsigned int spu_cycle_reset;
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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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* PPU_CYCLES event
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*/
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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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* physical processor
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*/
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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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struct pmc_cntrl_data {
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unsigned long vcntr;
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unsigned long evnts;
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unsigned long masks;
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unsigned long enabled;
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};
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/*
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* ibm,cbe-perftools rtas parameters
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*/
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struct pm_signal {
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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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*/
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u8 bit; /* Trigger/Event bit (if applicable) */
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};
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/*
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* rtas call arguments
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*/
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enum {
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SUBFUNC_RESET = 1,
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SUBFUNC_ACTIVATE = 2,
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SUBFUNC_DEACTIVATE = 3,
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PASSTHRU_IGNORE = 0,
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PASSTHRU_ENABLE = 1,
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PASSTHRU_DISABLE = 2,
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};
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struct pm_cntrl {
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u16 enable;
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u16 stop_at_max;
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u16 trace_mode;
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u16 freeze;
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u16 count_mode;
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};
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static struct {
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u32 group_control;
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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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} pm_regs;
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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 struct pmc_cntrl_data pmc_cntrl[NUM_THREADS][NR_PHYS_CTRS];
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/*
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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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* either.
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*/
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/*
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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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*
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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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*/
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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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/*
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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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* is available.
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*/
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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(virt_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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/*
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* Firmware interface functions
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*/
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static int
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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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{
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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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}
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static void pm_rtas_reset_signals(u32 node)
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{
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int ret;
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struct pm_signal pm_signal_local;
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/*
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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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* concerned about.
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*/
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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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&pm_signal_local,
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sizeof(struct pm_signal));
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if (unlikely(ret))
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/*
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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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*/
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printk(KERN_WARNING "%s: rtas returned: %d\n",
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__FUNCTION__, ret);
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}
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static int pm_rtas_activate_signals(u32 node, u32 count)
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{
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int ret;
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int i, j;
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struct pm_signal pm_signal_local[NR_PHYS_CTRS];
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/*
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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 responsiblity
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* of the OProfile user tool to check the events are in
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* the same group.
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*/
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i = 0;
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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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i++;
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}
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}
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if (i != 0) {
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ret = rtas_ibm_cbe_perftools(SUBFUNC_ACTIVATE, PASSTHRU_ENABLE,
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pm_signal_local,
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i * sizeof(struct pm_signal));
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if (unlikely(ret)) {
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printk(KERN_WARNING "%s: rtas returned: %d\n",
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__FUNCTION__, ret);
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return -EIO;
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}
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}
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return 0;
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}
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/*
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* PM Signal functions
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*/
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static void set_pm_event(u32 ctr, int event, u32 unit_mask)
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{
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struct pm_signal *p;
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u32 signal_bit;
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u32 bus_word, bus_type, count_cycles, polarity, input_control;
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int j, i;
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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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p->bus_word = 1;
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p->sub_unit = 0;
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p->bit = 0;
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goto out;
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} else {
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pm_regs.pm07_cntrl[ctr] = 0;
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}
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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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/*
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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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* for the details.
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*/
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if (input_control == 0) {
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if (signal_bit > 31) {
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signal_bit -= 32;
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if (bus_word == 0x3)
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bus_word = 0x2;
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else if (bus_word == 0xc)
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bus_word = 0x8;
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}
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if ((bus_type == 0) && p->signal_group >= 60)
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bus_type = 2;
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if ((bus_type == 1) && p->signal_group >= 50)
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bus_type = 0;
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pm_regs.pm07_cntrl[ctr] |= PM07_CTR_INPUT_MUX(signal_bit);
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} else {
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pm_regs.pm07_cntrl[ctr] = 0;
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p->bit = signal_bit;
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}
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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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input_bus[j] = i;
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pm_regs.group_control |=
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(i << (30 - (2 * j)));
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break;
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}
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}
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}
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}
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out:
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;
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}
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static void write_pm_cntrl(int cpu)
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{
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/*
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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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*/
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u32 val = 0;
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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 == 1)
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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.freeze == 1)
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val |= CBE_PM_FREEZE_ALL_CTRS;
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/*
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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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*/
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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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}
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static inline void
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set_count_mode(u32 kernel, u32 user)
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{
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/*
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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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*/
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if (kernel) {
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if (user)
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pm_regs.pm_cntrl.count_mode = CBE_COUNT_ALL_MODES;
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else
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pm_regs.pm_cntrl.count_mode =
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CBE_COUNT_SUPERVISOR_MODE;
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} else {
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if (user)
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pm_regs.pm_cntrl.count_mode = CBE_COUNT_PROBLEM_MODE;
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else
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pm_regs.pm_cntrl.count_mode =
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CBE_COUNT_HYPERVISOR_MODE;
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}
|
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}
|
|
|
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static inline void enable_ctr(u32 cpu, u32 ctr, u32 * pm07_cntrl)
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{
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|
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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
|
|
* 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
|
|
* pair of per-cpu arrays is used for storing the previous and next
|
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* pmc values for a given node.
|
|
* NOTE: We use the per-cpu variable to improve cache performance.
|
|
*
|
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* This routine will alternate loading the virtual counters for
|
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* virtual CPUs
|
|
*/
|
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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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u32 cpu;
|
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unsigned long flags;
|
|
|
|
/*
|
|
* 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(&virt_cntr_lock, flags);
|
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|
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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;
|
|
|
|
for (i = 0; i < NUM_INPUT_BUS_WORDS; i++)
|
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input_bus[i] = 0xff;
|
|
|
|
/*
|
|
* There are some per thread events. Must do the
|
|
* set event, for the thread that is being started
|
|
*/
|
|
for (i = 0; i < num_counters; i++)
|
|
set_pm_event(i,
|
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pmc_cntrl[next_hdw_thread][i].evnts,
|
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pmc_cntrl[next_hdw_thread][i].masks);
|
|
|
|
/*
|
|
* The following is done only once per each node, but
|
|
* we need cpu #, not node #, to pass to the cbe_xxx functions.
|
|
*/
|
|
for_each_online_cpu(cpu) {
|
|
if (cbe_get_hw_thread_id(cpu))
|
|
continue;
|
|
|
|
/*
|
|
* stop counters, save counter values, restore counts
|
|
* for previous thread
|
|
*/
|
|
cbe_disable_pm(cpu);
|
|
cbe_disable_pm_interrupts(cpu);
|
|
for (i = 0; i < num_counters; i++) {
|
|
per_cpu(pmc_values, cpu + prev_hdw_thread)[i]
|
|
= cbe_read_ctr(cpu, i);
|
|
|
|
if (per_cpu(pmc_values, cpu + next_hdw_thread)[i]
|
|
== 0xFFFFFFFF)
|
|
/* If the cntr value is 0xffffffff, we must
|
|
* reset that to 0xfffffff0 when the current
|
|
* thread is restarted. This will generate a
|
|
* new interrupt and make sure that we never
|
|
* restore the counters to the max value. If
|
|
* the counters were restored to the max value,
|
|
* they do not increment and no interrupts are
|
|
* generated. Hence no more samples will be
|
|
* collected on that cpu.
|
|
*/
|
|
cbe_write_ctr(cpu, i, 0xFFFFFFF0);
|
|
else
|
|
cbe_write_ctr(cpu, i,
|
|
per_cpu(pmc_values,
|
|
cpu +
|
|
next_hdw_thread)[i]);
|
|
}
|
|
|
|
/*
|
|
* Switch to the other thread. Change the interrupt
|
|
* and control regs to be scheduled on the CPU
|
|
* corresponding to the thread to execute.
|
|
*/
|
|
for (i = 0; i < num_counters; i++) {
|
|
if (pmc_cntrl[next_hdw_thread][i].enabled) {
|
|
/*
|
|
* There are some per thread events.
|
|
* Must do the set event, enable_cntr
|
|
* for each cpu.
|
|
*/
|
|
enable_ctr(cpu, i,
|
|
pm_regs.pm07_cntrl);
|
|
} else {
|
|
cbe_write_pm07_control(cpu, i, 0);
|
|
}
|
|
}
|
|
|
|
/* Enable interrupts on the CPU thread that is starting */
|
|
cbe_enable_pm_interrupts(cpu, next_hdw_thread,
|
|
virt_cntr_inter_mask);
|
|
cbe_enable_pm(cpu);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&virt_cntr_lock, flags);
|
|
|
|
mod_timer(&timer_virt_cntr, jiffies + HZ / 10);
|
|
}
|
|
|
|
static void start_virt_cntrs(void)
|
|
{
|
|
init_timer(&timer_virt_cntr);
|
|
timer_virt_cntr.function = cell_virtual_cntr;
|
|
timer_virt_cntr.data = 0UL;
|
|
timer_virt_cntr.expires = jiffies + HZ / 10;
|
|
add_timer(&timer_virt_cntr);
|
|
}
|
|
|
|
/* This function is called once for all cpus combined */
|
|
static int cell_reg_setup(struct op_counter_config *ctr,
|
|
struct op_system_config *sys, int num_ctrs)
|
|
{
|
|
int i, j, cpu;
|
|
spu_cycle_reset = 0;
|
|
|
|
if (ctr[0].event == SPU_CYCLES_EVENT_NUM) {
|
|
spu_cycle_reset = ctr[0].count;
|
|
|
|
/*
|
|
* Each node will need to make the rtas call to start
|
|
* and stop SPU profiling. Get the token once and store it.
|
|
*/
|
|
spu_rtas_token = rtas_token("ibm,cbe-spu-perftools");
|
|
|
|
if (unlikely(spu_rtas_token == RTAS_UNKNOWN_SERVICE)) {
|
|
printk(KERN_ERR
|
|
"%s: rtas token ibm,cbe-spu-perftools unknown\n",
|
|
__FUNCTION__);
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
pm_rtas_token = rtas_token("ibm,cbe-perftools");
|
|
|
|
/*
|
|
* For all events excetp PPU CYCLEs, each node will need to make
|
|
* the rtas cbe-perftools call to setup and reset the debug bus.
|
|
* Make the token lookup call once and store it in the global
|
|
* variable pm_rtas_token.
|
|
*/
|
|
if (unlikely(pm_rtas_token == RTAS_UNKNOWN_SERVICE)) {
|
|
printk(KERN_ERR
|
|
"%s: rtas token ibm,cbe-perftools unknown\n",
|
|
__FUNCTION__);
|
|
return -EIO;
|
|
}
|
|
|
|
num_counters = num_ctrs;
|
|
|
|
pm_regs.group_control = 0;
|
|
pm_regs.debug_bus_control = 0;
|
|
|
|
/* setup the pm_control register */
|
|
memset(&pm_regs.pm_cntrl, 0, sizeof(struct pm_cntrl));
|
|
pm_regs.pm_cntrl.stop_at_max = 1;
|
|
pm_regs.pm_cntrl.trace_mode = 0;
|
|
pm_regs.pm_cntrl.freeze = 1;
|
|
|
|
set_count_mode(sys->enable_kernel, sys->enable_user);
|
|
|
|
/* Setup the thread 0 events */
|
|
for (i = 0; i < num_ctrs; ++i) {
|
|
|
|
pmc_cntrl[0][i].evnts = ctr[i].event;
|
|
pmc_cntrl[0][i].masks = ctr[i].unit_mask;
|
|
pmc_cntrl[0][i].enabled = ctr[i].enabled;
|
|
pmc_cntrl[0][i].vcntr = i;
|
|
|
|
for_each_possible_cpu(j)
|
|
per_cpu(pmc_values, j)[i] = 0;
|
|
}
|
|
|
|
/*
|
|
* Setup the thread 1 events, map the thread 0 event to the
|
|
* equivalent thread 1 event.
|
|
*/
|
|
for (i = 0; i < num_ctrs; ++i) {
|
|
if ((ctr[i].event >= 2100) && (ctr[i].event <= 2111))
|
|
pmc_cntrl[1][i].evnts = ctr[i].event + 19;
|
|
else if (ctr[i].event == 2203)
|
|
pmc_cntrl[1][i].evnts = ctr[i].event;
|
|
else if ((ctr[i].event >= 2200) && (ctr[i].event <= 2215))
|
|
pmc_cntrl[1][i].evnts = ctr[i].event + 16;
|
|
else
|
|
pmc_cntrl[1][i].evnts = ctr[i].event;
|
|
|
|
pmc_cntrl[1][i].masks = ctr[i].unit_mask;
|
|
pmc_cntrl[1][i].enabled = ctr[i].enabled;
|
|
pmc_cntrl[1][i].vcntr = i;
|
|
}
|
|
|
|
for (i = 0; i < NUM_INPUT_BUS_WORDS; i++)
|
|
input_bus[i] = 0xff;
|
|
|
|
/*
|
|
* Our counters count up, and "count" refers to
|
|
* how much before the next interrupt, and we interrupt
|
|
* on overflow. So we calculate the starting value
|
|
* which will give us "count" until overflow.
|
|
* Then we set the events on the enabled counters.
|
|
*/
|
|
for (i = 0; i < num_counters; ++i) {
|
|
/* start with virtual counter set 0 */
|
|
if (pmc_cntrl[0][i].enabled) {
|
|
/* Using 32bit counters, reset max - count */
|
|
reset_value[i] = 0xFFFFFFFF - ctr[i].count;
|
|
set_pm_event(i,
|
|
pmc_cntrl[0][i].evnts,
|
|
pmc_cntrl[0][i].masks);
|
|
|
|
/* global, used by cell_cpu_setup */
|
|
ctr_enabled |= (1 << i);
|
|
}
|
|
}
|
|
|
|
/* initialize the previous counts for the virtual cntrs */
|
|
for_each_online_cpu(cpu)
|
|
for (i = 0; i < num_counters; ++i) {
|
|
per_cpu(pmc_values, cpu)[i] = reset_value[i];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/* This function is called once for each cpu */
|
|
static int cell_cpu_setup(struct op_counter_config *cntr)
|
|
{
|
|
u32 cpu = smp_processor_id();
|
|
u32 num_enabled = 0;
|
|
int i;
|
|
|
|
if (spu_cycle_reset)
|
|
return 0;
|
|
|
|
/* There is one performance monitor per processor chip (i.e. node),
|
|
* so we only need to perform this function once per node.
|
|
*/
|
|
if (cbe_get_hw_thread_id(cpu))
|
|
return 0;
|
|
|
|
/* Stop all counters */
|
|
cbe_disable_pm(cpu);
|
|
cbe_disable_pm_interrupts(cpu);
|
|
|
|
cbe_write_pm(cpu, pm_interval, 0);
|
|
cbe_write_pm(cpu, pm_start_stop, 0);
|
|
cbe_write_pm(cpu, group_control, pm_regs.group_control);
|
|
cbe_write_pm(cpu, debug_bus_control, pm_regs.debug_bus_control);
|
|
write_pm_cntrl(cpu);
|
|
|
|
for (i = 0; i < num_counters; ++i) {
|
|
if (ctr_enabled & (1 << i)) {
|
|
pm_signal[num_enabled].cpu = cbe_cpu_to_node(cpu);
|
|
num_enabled++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The pm_rtas_activate_signals will return -EIO if the FW
|
|
* call failed.
|
|
*/
|
|
return pm_rtas_activate_signals(cbe_cpu_to_node(cpu), num_enabled);
|
|
}
|
|
|
|
#define ENTRIES 303
|
|
#define MAXLFSR 0xFFFFFF
|
|
|
|
/* precomputed table of 24 bit LFSR values */
|
|
static int initial_lfsr[] = {
|
|
8221349, 12579195, 5379618, 10097839, 7512963, 7519310, 3955098, 10753424,
|
|
15507573, 7458917, 285419, 2641121, 9780088, 3915503, 6668768, 1548716,
|
|
4885000, 8774424, 9650099, 2044357, 2304411, 9326253, 10332526, 4421547,
|
|
3440748, 10179459, 13332843, 10375561, 1313462, 8375100, 5198480, 6071392,
|
|
9341783, 1526887, 3985002, 1439429, 13923762, 7010104, 11969769, 4547026,
|
|
2040072, 4025602, 3437678, 7939992, 11444177, 4496094, 9803157, 10745556,
|
|
3671780, 4257846, 5662259, 13196905, 3237343, 12077182, 16222879, 7587769,
|
|
14706824, 2184640, 12591135, 10420257, 7406075, 3648978, 11042541, 15906893,
|
|
11914928, 4732944, 10695697, 12928164, 11980531, 4430912, 11939291, 2917017,
|
|
6119256, 4172004, 9373765, 8410071, 14788383, 5047459, 5474428, 1737756,
|
|
15967514, 13351758, 6691285, 8034329, 2856544, 14394753, 11310160, 12149558,
|
|
7487528, 7542781, 15668898, 12525138, 12790975, 3707933, 9106617, 1965401,
|
|
16219109, 12801644, 2443203, 4909502, 8762329, 3120803, 6360315, 9309720,
|
|
15164599, 10844842, 4456529, 6667610, 14924259, 884312, 6234963, 3326042,
|
|
15973422, 13919464, 5272099, 6414643, 3909029, 2764324, 5237926, 4774955,
|
|
10445906, 4955302, 5203726, 10798229, 11443419, 2303395, 333836, 9646934,
|
|
3464726, 4159182, 568492, 995747, 10318756, 13299332, 4836017, 8237783,
|
|
3878992, 2581665, 11394667, 5672745, 14412947, 3159169, 9094251, 16467278,
|
|
8671392, 15230076, 4843545, 7009238, 15504095, 1494895, 9627886, 14485051,
|
|
8304291, 252817, 12421642, 16085736, 4774072, 2456177, 4160695, 15409741,
|
|
4902868, 5793091, 13162925, 16039714, 782255, 11347835, 14884586, 366972,
|
|
16308990, 11913488, 13390465, 2958444, 10340278, 1177858, 1319431, 10426302,
|
|
2868597, 126119, 5784857, 5245324, 10903900, 16436004, 3389013, 1742384,
|
|
14674502, 10279218, 8536112, 10364279, 6877778, 14051163, 1025130, 6072469,
|
|
1988305, 8354440, 8216060, 16342977, 13112639, 3976679, 5913576, 8816697,
|
|
6879995, 14043764, 3339515, 9364420, 15808858, 12261651, 2141560, 5636398,
|
|
10345425, 10414756, 781725, 6155650, 4746914, 5078683, 7469001, 6799140,
|
|
10156444, 9667150, 10116470, 4133858, 2121972, 1124204, 1003577, 1611214,
|
|
14304602, 16221850, 13878465, 13577744, 3629235, 8772583, 10881308, 2410386,
|
|
7300044, 5378855, 9301235, 12755149, 4977682, 8083074, 10327581, 6395087,
|
|
9155434, 15501696, 7514362, 14520507, 15808945, 3244584, 4741962, 9658130,
|
|
14336147, 8654727, 7969093, 15759799, 14029445, 5038459, 9894848, 8659300,
|
|
13699287, 8834306, 10712885, 14753895, 10410465, 3373251, 309501, 9561475,
|
|
5526688, 14647426, 14209836, 5339224, 207299, 14069911, 8722990, 2290950,
|
|
3258216, 12505185, 6007317, 9218111, 14661019, 10537428, 11731949, 9027003,
|
|
6641507, 9490160, 200241, 9720425, 16277895, 10816638, 1554761, 10431375,
|
|
7467528, 6790302, 3429078, 14633753, 14428997, 11463204, 3576212, 2003426,
|
|
6123687, 820520, 9992513, 15784513, 5778891, 6428165, 8388607
|
|
};
|
|
|
|
/*
|
|
* The hardware uses an LFSR counting sequence to determine when to capture
|
|
* the SPU PCs. An LFSR sequence is like a puesdo random number sequence
|
|
* where each number occurs once in the sequence but the sequence is not in
|
|
* numerical order. The SPU PC capture is done when the LFSR sequence reaches
|
|
* the last value in the sequence. Hence the user specified value N
|
|
* corresponds to the LFSR number that is N from the end of the sequence.
|
|
*
|
|
* To avoid the time to compute the LFSR, a lookup table is used. The 24 bit
|
|
* LFSR sequence is broken into four ranges. The spacing of the precomputed
|
|
* values is adjusted in each range so the error between the user specifed
|
|
* number (N) of events between samples and the actual number of events based
|
|
* on the precomputed value will be les then about 6.2%. Note, if the user
|
|
* specifies N < 2^16, the LFSR value that is 2^16 from the end will be used.
|
|
* This is to prevent the loss of samples because the trace buffer is full.
|
|
*
|
|
* User specified N Step between Index in
|
|
* precomputed values precomputed
|
|
* table
|
|
* 0 to 2^16-1 ---- 0
|
|
* 2^16 to 2^16+2^19-1 2^12 1 to 128
|
|
* 2^16+2^19 to 2^16+2^19+2^22-1 2^15 129 to 256
|
|
* 2^16+2^19+2^22 to 2^24-1 2^18 257 to 302
|
|
*
|
|
*
|
|
* For example, the LFSR values in the second range are computed for 2^16,
|
|
* 2^16+2^12, ... , 2^19-2^16, 2^19 and stored in the table at indicies
|
|
* 1, 2,..., 127, 128.
|
|
*
|
|
* The 24 bit LFSR value for the nth number in the sequence can be
|
|
* calculated using the following code:
|
|
*
|
|
* #define size 24
|
|
* int calculate_lfsr(int n)
|
|
* {
|
|
* int i;
|
|
* unsigned int newlfsr0;
|
|
* unsigned int lfsr = 0xFFFFFF;
|
|
* unsigned int howmany = n;
|
|
*
|
|
* for (i = 2; i < howmany + 2; i++) {
|
|
* newlfsr0 = (((lfsr >> (size - 1 - 0)) & 1) ^
|
|
* ((lfsr >> (size - 1 - 1)) & 1) ^
|
|
* (((lfsr >> (size - 1 - 6)) & 1) ^
|
|
* ((lfsr >> (size - 1 - 23)) & 1)));
|
|
*
|
|
* lfsr >>= 1;
|
|
* lfsr = lfsr | (newlfsr0 << (size - 1));
|
|
* }
|
|
* return lfsr;
|
|
* }
|
|
*/
|
|
|
|
#define V2_16 (0x1 << 16)
|
|
#define V2_19 (0x1 << 19)
|
|
#define V2_22 (0x1 << 22)
|
|
|
|
static int calculate_lfsr(int n)
|
|
{
|
|
/*
|
|
* The ranges and steps are in powers of 2 so the calculations
|
|
* can be done using shifts rather then divide.
|
|
*/
|
|
int index;
|
|
|
|
if ((n >> 16) == 0)
|
|
index = 0;
|
|
else if (((n - V2_16) >> 19) == 0)
|
|
index = ((n - V2_16) >> 12) + 1;
|
|
else if (((n - V2_16 - V2_19) >> 22) == 0)
|
|
index = ((n - V2_16 - V2_19) >> 15 ) + 1 + 128;
|
|
else if (((n - V2_16 - V2_19 - V2_22) >> 24) == 0)
|
|
index = ((n - V2_16 - V2_19 - V2_22) >> 18 ) + 1 + 256;
|
|
else
|
|
index = ENTRIES-1;
|
|
|
|
/* make sure index is valid */
|
|
if ((index > ENTRIES) || (index < 0))
|
|
index = ENTRIES-1;
|
|
|
|
return initial_lfsr[index];
|
|
}
|
|
|
|
static int pm_rtas_activate_spu_profiling(u32 node)
|
|
{
|
|
int ret, i;
|
|
struct pm_signal pm_signal_local[NR_PHYS_CTRS];
|
|
|
|
/*
|
|
* Set up the rtas call to configure the debug bus to
|
|
* route the SPU PCs. Setup the pm_signal for each SPU
|
|
*/
|
|
for (i = 0; i < NUM_SPUS_PER_NODE; i++) {
|
|
pm_signal_local[i].cpu = node;
|
|
pm_signal_local[i].signal_group = 41;
|
|
/* spu i on word (i/2) */
|
|
pm_signal_local[i].bus_word = 1 << i / 2;
|
|
/* spu i */
|
|
pm_signal_local[i].sub_unit = i;
|
|
pm_signal_local[i].bit = 63;
|
|
}
|
|
|
|
ret = rtas_ibm_cbe_perftools(SUBFUNC_ACTIVATE,
|
|
PASSTHRU_ENABLE, pm_signal_local,
|
|
(NUM_SPUS_PER_NODE
|
|
* sizeof(struct pm_signal)));
|
|
|
|
if (unlikely(ret)) {
|
|
printk(KERN_WARNING "%s: rtas returned: %d\n",
|
|
__FUNCTION__, ret);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_CPU_FREQ
|
|
static int
|
|
oprof_cpufreq_notify(struct notifier_block *nb, unsigned long val, void *data)
|
|
{
|
|
int ret = 0;
|
|
struct cpufreq_freqs *frq = data;
|
|
if ((val == CPUFREQ_PRECHANGE && frq->old < frq->new) ||
|
|
(val == CPUFREQ_POSTCHANGE && frq->old > frq->new) ||
|
|
(val == CPUFREQ_RESUMECHANGE || val == CPUFREQ_SUSPENDCHANGE))
|
|
set_spu_profiling_frequency(frq->new, spu_cycle_reset);
|
|
return ret;
|
|
}
|
|
|
|
static struct notifier_block cpu_freq_notifier_block = {
|
|
.notifier_call = oprof_cpufreq_notify
|
|
};
|
|
#endif
|
|
|
|
static int cell_global_start_spu(struct op_counter_config *ctr)
|
|
{
|
|
int subfunc;
|
|
unsigned int lfsr_value;
|
|
int cpu;
|
|
int ret;
|
|
int rtas_error;
|
|
unsigned int cpu_khzfreq = 0;
|
|
|
|
/* The SPU profiling uses time-based profiling based on
|
|
* cpu frequency, so if configured with the CPU_FREQ
|
|
* option, we should detect frequency changes and react
|
|
* accordingly.
|
|
*/
|
|
#ifdef CONFIG_CPU_FREQ
|
|
ret = cpufreq_register_notifier(&cpu_freq_notifier_block,
|
|
CPUFREQ_TRANSITION_NOTIFIER);
|
|
if (ret < 0)
|
|
/* this is not a fatal error */
|
|
printk(KERN_ERR "CPU freq change registration failed: %d\n",
|
|
ret);
|
|
|
|
else
|
|
cpu_khzfreq = cpufreq_quick_get(smp_processor_id());
|
|
#endif
|
|
|
|
set_spu_profiling_frequency(cpu_khzfreq, spu_cycle_reset);
|
|
|
|
for_each_online_cpu(cpu) {
|
|
if (cbe_get_hw_thread_id(cpu))
|
|
continue;
|
|
|
|
/*
|
|
* Setup SPU cycle-based profiling.
|
|
* Set perf_mon_control bit 0 to a zero before
|
|
* enabling spu collection hardware.
|
|
*/
|
|
cbe_write_pm(cpu, pm_control, 0);
|
|
|
|
if (spu_cycle_reset > MAX_SPU_COUNT)
|
|
/* use largest possible value */
|
|
lfsr_value = calculate_lfsr(MAX_SPU_COUNT-1);
|
|
else
|
|
lfsr_value = calculate_lfsr(spu_cycle_reset);
|
|
|
|
/* must use a non zero value. Zero disables data collection. */
|
|
if (lfsr_value == 0)
|
|
lfsr_value = calculate_lfsr(1);
|
|
|
|
lfsr_value = lfsr_value << 8; /* shift lfsr to correct
|
|
* register location
|
|
*/
|
|
|
|
/* debug bus setup */
|
|
ret = pm_rtas_activate_spu_profiling(cbe_cpu_to_node(cpu));
|
|
|
|
if (unlikely(ret)) {
|
|
rtas_error = ret;
|
|
goto out;
|
|
}
|
|
|
|
|
|
subfunc = 2; /* 2 - activate SPU tracing, 3 - deactivate */
|
|
|
|
/* start profiling */
|
|
ret = rtas_call(spu_rtas_token, 3, 1, NULL, subfunc,
|
|
cbe_cpu_to_node(cpu), lfsr_value);
|
|
|
|
if (unlikely(ret != 0)) {
|
|
printk(KERN_ERR
|
|
"%s: rtas call ibm,cbe-spu-perftools failed, return = %d\n",
|
|
__FUNCTION__, ret);
|
|
rtas_error = -EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
rtas_error = start_spu_profiling(spu_cycle_reset);
|
|
if (rtas_error)
|
|
goto out_stop;
|
|
|
|
oprofile_running = 1;
|
|
return 0;
|
|
|
|
out_stop:
|
|
cell_global_stop_spu(); /* clean up the PMU/debug bus */
|
|
out:
|
|
return rtas_error;
|
|
}
|
|
|
|
static int cell_global_start_ppu(struct op_counter_config *ctr)
|
|
{
|
|
u32 cpu, i;
|
|
u32 interrupt_mask = 0;
|
|
|
|
/* This routine gets called once for the system.
|
|
* There is one performance monitor per node, so we
|
|
* only need to perform this function once per node.
|
|
*/
|
|
for_each_online_cpu(cpu) {
|
|
if (cbe_get_hw_thread_id(cpu))
|
|
continue;
|
|
|
|
interrupt_mask = 0;
|
|
|
|
for (i = 0; i < num_counters; ++i) {
|
|
if (ctr_enabled & (1 << i)) {
|
|
cbe_write_ctr(cpu, i, reset_value[i]);
|
|
enable_ctr(cpu, i, pm_regs.pm07_cntrl);
|
|
interrupt_mask |=
|
|
CBE_PM_CTR_OVERFLOW_INTR(i);
|
|
} else {
|
|
/* Disable counter */
|
|
cbe_write_pm07_control(cpu, i, 0);
|
|
}
|
|
}
|
|
|
|
cbe_get_and_clear_pm_interrupts(cpu);
|
|
cbe_enable_pm_interrupts(cpu, hdw_thread, interrupt_mask);
|
|
cbe_enable_pm(cpu);
|
|
}
|
|
|
|
virt_cntr_inter_mask = interrupt_mask;
|
|
oprofile_running = 1;
|
|
smp_wmb();
|
|
|
|
/*
|
|
* NOTE: start_virt_cntrs will result in cell_virtual_cntr() being
|
|
* executed which manipulates the PMU. We start the "virtual counter"
|
|
* here so that we do not need to synchronize access to the PMU in
|
|
* the above for-loop.
|
|
*/
|
|
start_virt_cntrs();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cell_global_start(struct op_counter_config *ctr)
|
|
{
|
|
if (spu_cycle_reset)
|
|
return cell_global_start_spu(ctr);
|
|
else
|
|
return cell_global_start_ppu(ctr);
|
|
}
|
|
|
|
/*
|
|
* Note the generic OProfile stop calls do not support returning
|
|
* an error on stop. Hence, will not return an error if the FW
|
|
* calls fail on stop. Failure to reset the debug bus is not an issue.
|
|
* Failure to disable the SPU profiling is not an issue. The FW calls
|
|
* to enable the performance counters and debug bus will work even if
|
|
* the hardware was not cleanly reset.
|
|
*/
|
|
static void cell_global_stop_spu(void)
|
|
{
|
|
int subfunc, rtn_value;
|
|
unsigned int lfsr_value;
|
|
int cpu;
|
|
|
|
oprofile_running = 0;
|
|
|
|
#ifdef CONFIG_CPU_FREQ
|
|
cpufreq_unregister_notifier(&cpu_freq_notifier_block,
|
|
CPUFREQ_TRANSITION_NOTIFIER);
|
|
#endif
|
|
|
|
for_each_online_cpu(cpu) {
|
|
if (cbe_get_hw_thread_id(cpu))
|
|
continue;
|
|
|
|
subfunc = 3; /*
|
|
* 2 - activate SPU tracing,
|
|
* 3 - deactivate
|
|
*/
|
|
lfsr_value = 0x8f100000;
|
|
|
|
rtn_value = rtas_call(spu_rtas_token, 3, 1, NULL,
|
|
subfunc, cbe_cpu_to_node(cpu),
|
|
lfsr_value);
|
|
|
|
if (unlikely(rtn_value != 0)) {
|
|
printk(KERN_ERR
|
|
"%s: rtas call ibm,cbe-spu-perftools failed, return = %d\n",
|
|
__FUNCTION__, rtn_value);
|
|
}
|
|
|
|
/* Deactivate the signals */
|
|
pm_rtas_reset_signals(cbe_cpu_to_node(cpu));
|
|
}
|
|
|
|
stop_spu_profiling();
|
|
}
|
|
|
|
static void cell_global_stop_ppu(void)
|
|
{
|
|
int cpu;
|
|
|
|
/*
|
|
* This routine will be called once for the system.
|
|
* There is one performance monitor per node, so we
|
|
* only need to perform this function once per node.
|
|
*/
|
|
del_timer_sync(&timer_virt_cntr);
|
|
oprofile_running = 0;
|
|
smp_wmb();
|
|
|
|
for_each_online_cpu(cpu) {
|
|
if (cbe_get_hw_thread_id(cpu))
|
|
continue;
|
|
|
|
cbe_sync_irq(cbe_cpu_to_node(cpu));
|
|
/* Stop the counters */
|
|
cbe_disable_pm(cpu);
|
|
|
|
/* Deactivate the signals */
|
|
pm_rtas_reset_signals(cbe_cpu_to_node(cpu));
|
|
|
|
/* Deactivate interrupts */
|
|
cbe_disable_pm_interrupts(cpu);
|
|
}
|
|
}
|
|
|
|
static void cell_global_stop(void)
|
|
{
|
|
if (spu_cycle_reset)
|
|
cell_global_stop_spu();
|
|
else
|
|
cell_global_stop_ppu();
|
|
}
|
|
|
|
static void cell_handle_interrupt(struct pt_regs *regs,
|
|
struct op_counter_config *ctr)
|
|
{
|
|
u32 cpu;
|
|
u64 pc;
|
|
int is_kernel;
|
|
unsigned long flags = 0;
|
|
u32 interrupt_mask;
|
|
int i;
|
|
|
|
cpu = smp_processor_id();
|
|
|
|
/*
|
|
* Need to make sure the interrupt handler and the virt counter
|
|
* routine are not running at the same time. See the
|
|
* cell_virtual_cntr() routine for additional comments.
|
|
*/
|
|
spin_lock_irqsave(&virt_cntr_lock, flags);
|
|
|
|
/*
|
|
* Need to disable and reenable the performance counters
|
|
* to get the desired behavior from the hardware. This
|
|
* is hardware specific.
|
|
*/
|
|
|
|
cbe_disable_pm(cpu);
|
|
|
|
interrupt_mask = cbe_get_and_clear_pm_interrupts(cpu);
|
|
|
|
/*
|
|
* If the interrupt mask has been cleared, then the virt cntr
|
|
* has cleared the interrupt. When the thread that generated
|
|
* the interrupt is restored, the data count will be restored to
|
|
* 0xffffff0 to cause the interrupt to be regenerated.
|
|
*/
|
|
|
|
if ((oprofile_running == 1) && (interrupt_mask != 0)) {
|
|
pc = regs->nip;
|
|
is_kernel = is_kernel_addr(pc);
|
|
|
|
for (i = 0; i < num_counters; ++i) {
|
|
if ((interrupt_mask & CBE_PM_CTR_OVERFLOW_INTR(i))
|
|
&& ctr[i].enabled) {
|
|
oprofile_add_pc(pc, is_kernel, i);
|
|
cbe_write_ctr(cpu, i, reset_value[i]);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The counters were frozen by the interrupt.
|
|
* Reenable the interrupt and restart the counters.
|
|
* If there was a race between the interrupt handler and
|
|
* the virtual counter routine. The virutal counter
|
|
* routine may have cleared the interrupts. Hence must
|
|
* use the virt_cntr_inter_mask to re-enable the interrupts.
|
|
*/
|
|
cbe_enable_pm_interrupts(cpu, hdw_thread,
|
|
virt_cntr_inter_mask);
|
|
|
|
/*
|
|
* The writes to the various performance counters only writes
|
|
* to a latch. The new values (interrupt setting bits, reset
|
|
* counter value etc.) are not copied to the actual registers
|
|
* until the performance monitor is enabled. In order to get
|
|
* this to work as desired, the permormance monitor needs to
|
|
* be disabled while writing to the latches. This is a
|
|
* HW design issue.
|
|
*/
|
|
cbe_enable_pm(cpu);
|
|
}
|
|
spin_unlock_irqrestore(&virt_cntr_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* This function is called from the generic OProfile
|
|
* driver. When profiling PPUs, we need to do the
|
|
* generic sync start; otherwise, do spu_sync_start.
|
|
*/
|
|
static int cell_sync_start(void)
|
|
{
|
|
if (spu_cycle_reset)
|
|
return spu_sync_start();
|
|
else
|
|
return DO_GENERIC_SYNC;
|
|
}
|
|
|
|
static int cell_sync_stop(void)
|
|
{
|
|
if (spu_cycle_reset)
|
|
return spu_sync_stop();
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
struct op_powerpc_model op_model_cell = {
|
|
.reg_setup = cell_reg_setup,
|
|
.cpu_setup = cell_cpu_setup,
|
|
.global_start = cell_global_start,
|
|
.global_stop = cell_global_stop,
|
|
.sync_start = cell_sync_start,
|
|
.sync_stop = cell_sync_stop,
|
|
.handle_interrupt = cell_handle_interrupt,
|
|
};
|
|
|