diff options
Diffstat (limited to 'kernel/arch/powerpc/oprofile/op_model_cell.c')
| -rw-r--r-- | kernel/arch/powerpc/oprofile/op_model_cell.c | 1717 |
1 files changed, 1717 insertions, 0 deletions
diff --git a/kernel/arch/powerpc/oprofile/op_model_cell.c b/kernel/arch/powerpc/oprofile/op_model_cell.c new file mode 100644 index 000000000..863d89386 --- /dev/null +++ b/kernel/arch/powerpc/oprofile/op_model_cell.c @@ -0,0 +1,1717 @@ +/* + * Cell Broadband Engine OProfile Support + * + * (C) Copyright IBM Corporation 2006 + * + * Author: David Erb (djerb@us.ibm.com) + * Modifications: + * Carl Love <carll@us.ibm.com> + * Maynard Johnson <maynardj@us.ibm.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/cpufreq.h> +#include <linux/delay.h> +#include <linux/jiffies.h> +#include <linux/kthread.h> +#include <linux/oprofile.h> +#include <linux/percpu.h> +#include <linux/smp.h> +#include <linux/spinlock.h> +#include <linux/timer.h> +#include <asm/cell-pmu.h> +#include <asm/cputable.h> +#include <asm/firmware.h> +#include <asm/io.h> +#include <asm/oprofile_impl.h> +#include <asm/processor.h> +#include <asm/prom.h> +#include <asm/ptrace.h> +#include <asm/reg.h> +#include <asm/rtas.h> +#include <asm/cell-regs.h> + +#include "../platforms/cell/interrupt.h" +#include "cell/pr_util.h" + +#define PPU_PROFILING 0 +#define SPU_PROFILING_CYCLES 1 +#define SPU_PROFILING_EVENTS 2 + +#define SPU_EVENT_NUM_START 4100 +#define SPU_EVENT_NUM_STOP 4399 +#define SPU_PROFILE_EVENT_ADDR 4363 /* spu, address trace, decimal */ +#define SPU_PROFILE_EVENT_ADDR_MASK_A 0x146 /* sub unit set to zero */ +#define SPU_PROFILE_EVENT_ADDR_MASK_B 0x186 /* sub unit set to zero */ + +#define NUM_SPUS_PER_NODE 8 +#define SPU_CYCLES_EVENT_NUM 2 /* event number for SPU_CYCLES */ + +#define PPU_CYCLES_EVENT_NUM 1 /* event number for CYCLES */ +#define PPU_CYCLES_GRP_NUM 1 /* special group number for identifying + * PPU_CYCLES event + */ +#define CBE_COUNT_ALL_CYCLES 0x42800000 /* PPU cycle event specifier */ + +#define NUM_THREADS 2 /* number of physical threads in + * physical processor + */ +#define NUM_DEBUG_BUS_WORDS 4 +#define NUM_INPUT_BUS_WORDS 2 + +#define MAX_SPU_COUNT 0xFFFFFF /* maximum 24 bit LFSR value */ + +/* Minimum HW interval timer setting to send value to trace buffer is 10 cycle. + * To configure counter to send value every N cycles set counter to + * 2^32 - 1 - N. + */ +#define NUM_INTERVAL_CYC 0xFFFFFFFF - 10 + +/* + * spu_cycle_reset is the number of cycles between samples. + * This variable is used for SPU profiling and should ONLY be set + * at the beginning of cell_reg_setup; otherwise, it's read-only. + */ +static unsigned int spu_cycle_reset; +static unsigned int profiling_mode; +static int spu_evnt_phys_spu_indx; + +struct pmc_cntrl_data { + unsigned long vcntr; + unsigned long evnts; + unsigned long masks; + unsigned long enabled; +}; + +/* + * ibm,cbe-perftools rtas parameters + */ +struct pm_signal { + u16 cpu; /* Processor to modify */ + u16 sub_unit; /* hw subunit this applies to (if applicable)*/ + short int signal_group; /* Signal Group to Enable/Disable */ + u8 bus_word; /* Enable/Disable on this Trace/Trigger/Event + * Bus Word(s) (bitmask) + */ + u8 bit; /* Trigger/Event bit (if applicable) */ +}; + +/* + * rtas call arguments + */ +enum { + SUBFUNC_RESET = 1, + SUBFUNC_ACTIVATE = 2, + SUBFUNC_DEACTIVATE = 3, + + PASSTHRU_IGNORE = 0, + PASSTHRU_ENABLE = 1, + PASSTHRU_DISABLE = 2, +}; + +struct pm_cntrl { + u16 enable; + u16 stop_at_max; + u16 trace_mode; + u16 freeze; + u16 count_mode; + u16 spu_addr_trace; + u8 trace_buf_ovflw; +}; + +static struct { + u32 group_control; + u32 debug_bus_control; + struct pm_cntrl pm_cntrl; + u32 pm07_cntrl[NR_PHYS_CTRS]; +} pm_regs; + +#define GET_SUB_UNIT(x) ((x & 0x0000f000) >> 12) +#define GET_BUS_WORD(x) ((x & 0x000000f0) >> 4) +#define GET_BUS_TYPE(x) ((x & 0x00000300) >> 8) +#define GET_POLARITY(x) ((x & 0x00000002) >> 1) +#define GET_COUNT_CYCLES(x) (x & 0x00000001) +#define GET_INPUT_CONTROL(x) ((x & 0x00000004) >> 2) + +static DEFINE_PER_CPU(unsigned long[NR_PHYS_CTRS], pmc_values); +static unsigned long spu_pm_cnt[MAX_NUMNODES * NUM_SPUS_PER_NODE]; +static struct pmc_cntrl_data pmc_cntrl[NUM_THREADS][NR_PHYS_CTRS]; + +/* + * The CELL profiling code makes rtas calls to setup the debug bus to + * route the performance signals. Additionally, SPU profiling requires + * a second rtas call to setup the hardware to capture the SPU PCs. + * The EIO error value is returned if the token lookups or the rtas + * call fail. The EIO error number is the best choice of the existing + * error numbers. The probability of rtas related error is very low. But + * by returning EIO and printing additional information to dmsg the user + * will know that OProfile did not start and dmesg will tell them why. + * OProfile does not support returning errors on Stop. Not a huge issue + * since failure to reset the debug bus or stop the SPU PC collection is + * not a fatel issue. Chances are if the Stop failed, Start doesn't work + * either. + */ + +/* + * Interpetation of hdw_thread: + * 0 - even virtual cpus 0, 2, 4,... + * 1 - odd virtual cpus 1, 3, 5, ... + * + * FIXME: this is strictly wrong, we need to clean this up in a number + * of places. It works for now. -arnd + */ +static u32 hdw_thread; + +static u32 virt_cntr_inter_mask; +static struct timer_list timer_virt_cntr; +static struct timer_list timer_spu_event_swap; + +/* + * pm_signal needs to be global since it is initialized in + * cell_reg_setup at the time when the necessary information + * is available. + */ +static struct pm_signal pm_signal[NR_PHYS_CTRS]; +static int pm_rtas_token; /* token for debug bus setup call */ +static int spu_rtas_token; /* token for SPU cycle profiling */ + +static u32 reset_value[NR_PHYS_CTRS]; +static int num_counters; +static int oprofile_running; +static DEFINE_SPINLOCK(cntr_lock); + +static u32 ctr_enabled; + +static unsigned char input_bus[NUM_INPUT_BUS_WORDS]; + +/* + * Firmware interface functions + */ +static int +rtas_ibm_cbe_perftools(int subfunc, int passthru, + void *address, unsigned long length) +{ + u64 paddr = __pa(address); + + return rtas_call(pm_rtas_token, 5, 1, NULL, subfunc, + passthru, paddr >> 32, paddr & 0xffffffff, length); +} + +static void pm_rtas_reset_signals(u32 node) +{ + int ret; + struct pm_signal pm_signal_local; + + /* + * The debug bus is being set to the passthru disable state. + * However, the FW still expects atleast one legal signal routing + * entry or it will return an error on the arguments. If we don't + * supply a valid entry, we must ignore all return values. Ignoring + * all return values means we might miss an error we should be + * concerned about. + */ + + /* fw expects physical cpu #. */ + pm_signal_local.cpu = node; + pm_signal_local.signal_group = 21; + pm_signal_local.bus_word = 1; + pm_signal_local.sub_unit = 0; + pm_signal_local.bit = 0; + + ret = rtas_ibm_cbe_perftools(SUBFUNC_RESET, PASSTHRU_DISABLE, + &pm_signal_local, + sizeof(struct pm_signal)); + + if (unlikely(ret)) + /* + * Not a fatal error. For Oprofile stop, the oprofile + * functions do not support returning an error for + * failure to stop OProfile. + */ + printk(KERN_WARNING "%s: rtas returned: %d\n", + __func__, ret); +} + +static int pm_rtas_activate_signals(u32 node, u32 count) +{ + int ret; + int i, j; + struct pm_signal pm_signal_local[NR_PHYS_CTRS]; + + /* + * There is no debug setup required for the cycles event. + * Note that only events in the same group can be used. + * Otherwise, there will be conflicts in correctly routing + * the signals on the debug bus. It is the responsibility + * of the OProfile user tool to check the events are in + * the same group. + */ + i = 0; + for (j = 0; j < count; j++) { + if (pm_signal[j].signal_group != PPU_CYCLES_GRP_NUM) { + + /* fw expects physical cpu # */ + pm_signal_local[i].cpu = node; + pm_signal_local[i].signal_group + = pm_signal[j].signal_group; + pm_signal_local[i].bus_word = pm_signal[j].bus_word; + pm_signal_local[i].sub_unit = pm_signal[j].sub_unit; + pm_signal_local[i].bit = pm_signal[j].bit; + i++; + } + } + + if (i != 0) { + ret = rtas_ibm_cbe_perftools(SUBFUNC_ACTIVATE, PASSTHRU_ENABLE, + pm_signal_local, + i * sizeof(struct pm_signal)); + + if (unlikely(ret)) { + printk(KERN_WARNING "%s: rtas returned: %d\n", + __func__, ret); + return -EIO; + } + } + + return 0; +} + +/* + * PM Signal functions + */ +static void set_pm_event(u32 ctr, int event, u32 unit_mask) +{ + struct pm_signal *p; + u32 signal_bit; + u32 bus_word, bus_type, count_cycles, polarity, input_control; + int j, i; + + if (event == PPU_CYCLES_EVENT_NUM) { + /* Special Event: Count all cpu cycles */ + pm_regs.pm07_cntrl[ctr] = CBE_COUNT_ALL_CYCLES; + p = &(pm_signal[ctr]); + p->signal_group = PPU_CYCLES_GRP_NUM; + p->bus_word = 1; + p->sub_unit = 0; + p->bit = 0; + goto out; + } else { + pm_regs.pm07_cntrl[ctr] = 0; + } + + bus_word = GET_BUS_WORD(unit_mask); + bus_type = GET_BUS_TYPE(unit_mask); + count_cycles = GET_COUNT_CYCLES(unit_mask); + polarity = GET_POLARITY(unit_mask); + input_control = GET_INPUT_CONTROL(unit_mask); + signal_bit = (event % 100); + + p = &(pm_signal[ctr]); + + p->signal_group = event / 100; + p->bus_word = bus_word; + p->sub_unit = GET_SUB_UNIT(unit_mask); + + pm_regs.pm07_cntrl[ctr] = 0; + pm_regs.pm07_cntrl[ctr] |= PM07_CTR_COUNT_CYCLES(count_cycles); + pm_regs.pm07_cntrl[ctr] |= PM07_CTR_POLARITY(polarity); + pm_regs.pm07_cntrl[ctr] |= PM07_CTR_INPUT_CONTROL(input_control); + + /* + * Some of the islands signal selection is based on 64 bit words. + * The debug bus words are 32 bits, the input words to the performance + * counters are defined as 32 bits. Need to convert the 64 bit island + * specification to the appropriate 32 input bit and bus word for the + * performance counter event selection. See the CELL Performance + * monitoring signals manual and the Perf cntr hardware descriptions + * for the details. + */ + if (input_control == 0) { + if (signal_bit > 31) { + signal_bit -= 32; + if (bus_word == 0x3) + bus_word = 0x2; + else if (bus_word == 0xc) + bus_word = 0x8; + } + + if ((bus_type == 0) && p->signal_group >= 60) + bus_type = 2; + if ((bus_type == 1) && p->signal_group >= 50) + bus_type = 0; + + pm_regs.pm07_cntrl[ctr] |= PM07_CTR_INPUT_MUX(signal_bit); + } else { + pm_regs.pm07_cntrl[ctr] = 0; + p->bit = signal_bit; + } + + for (i = 0; i < NUM_DEBUG_BUS_WORDS; i++) { + if (bus_word & (1 << i)) { + pm_regs.debug_bus_control |= + (bus_type << (30 - (2 * i))); + + for (j = 0; j < NUM_INPUT_BUS_WORDS; j++) { + if (input_bus[j] == 0xff) { + input_bus[j] = i; + pm_regs.group_control |= + (i << (30 - (2 * j))); + + break; + } + } + } + } +out: + ; +} + +static void write_pm_cntrl(int cpu) +{ + /* + * Oprofile will use 32 bit counters, set bits 7:10 to 0 + * pmregs.pm_cntrl is a global + */ + + u32 val = 0; + if (pm_regs.pm_cntrl.enable == 1) + val |= CBE_PM_ENABLE_PERF_MON; + + if (pm_regs.pm_cntrl.stop_at_max == 1) + val |= CBE_PM_STOP_AT_MAX; + + if (pm_regs.pm_cntrl.trace_mode != 0) + val |= CBE_PM_TRACE_MODE_SET(pm_regs.pm_cntrl.trace_mode); + + if (pm_regs.pm_cntrl.trace_buf_ovflw == 1) + val |= CBE_PM_TRACE_BUF_OVFLW(pm_regs.pm_cntrl.trace_buf_ovflw); + if (pm_regs.pm_cntrl.freeze == 1) + val |= CBE_PM_FREEZE_ALL_CTRS; + + val |= CBE_PM_SPU_ADDR_TRACE_SET(pm_regs.pm_cntrl.spu_addr_trace); + + /* + * Routine set_count_mode must be called previously to set + * the count mode based on the user selection of user and kernel. + */ + val |= CBE_PM_COUNT_MODE_SET(pm_regs.pm_cntrl.count_mode); + cbe_write_pm(cpu, pm_control, val); +} + +static inline void +set_count_mode(u32 kernel, u32 user) +{ + /* + * The user must specify user and kernel if they want them. If + * neither is specified, OProfile will count in hypervisor mode. + * pm_regs.pm_cntrl is a global + */ + if (kernel) { + if (user) + pm_regs.pm_cntrl.count_mode = CBE_COUNT_ALL_MODES; + else + pm_regs.pm_cntrl.count_mode = + CBE_COUNT_SUPERVISOR_MODE; + } else { + if (user) + pm_regs.pm_cntrl.count_mode = CBE_COUNT_PROBLEM_MODE; + else + pm_regs.pm_cntrl.count_mode = + CBE_COUNT_HYPERVISOR_MODE; + } +} + +static inline void enable_ctr(u32 cpu, u32 ctr, u32 *pm07_cntrl) +{ + + pm07_cntrl[ctr] |= CBE_PM_CTR_ENABLE; + cbe_write_pm07_control(cpu, ctr, pm07_cntrl[ctr]); +} + +/* + * Oprofile is expected to collect data on all CPUs simultaneously. + * However, there is one set of performance counters per node. There are + * two hardware threads or virtual CPUs on each node. Hence, OProfile must + * multiplex in time the performance counter collection on the two virtual + * CPUs. The multiplexing of the performance counters is done by this + * virtual counter routine. + * + * The pmc_values used below is defined as 'per-cpu' but its use is + * more akin to 'per-node'. We need to store two sets of counter + * values per node -- one for the previous run and one for the next. + * 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 + * pmc values for a given node. + * NOTE: We use the per-cpu variable to improve cache performance. + * + * This routine will alternate loading the virtual counters for + * virtual CPUs + */ +static void cell_virtual_cntr(unsigned long data) +{ + int i, prev_hdw_thread, next_hdw_thread; + u32 cpu; + unsigned long flags; + + /* + * Make sure that the interrupt_hander and the virt counter are + * not both playing with the counters on the same node. + */ + + spin_lock_irqsave(&cntr_lock, flags); + + prev_hdw_thread = hdw_thread; + + /* switch the cpu handling the interrupts */ + hdw_thread = 1 ^ hdw_thread; + next_hdw_thread = hdw_thread; + + pm_regs.group_control = 0; + pm_regs.debug_bus_control = 0; + + for (i = 0; i < NUM_INPUT_BUS_WORDS; i++) + 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, + pmc_cntrl[next_hdw_thread][i].evnts, + 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(&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); +} + +static int cell_reg_setup_spu_cycles(struct op_counter_config *ctr, + struct op_system_config *sys, int num_ctrs) +{ + 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", + __func__); + return -EIO; + } + return 0; +} + +/* Unfortunately, the hardware will only support event profiling + * on one SPU per node at a time. Therefore, we must time slice + * the profiling across all SPUs in the node. Note, we do this + * in parallel for each node. The following routine is called + * periodically based on kernel timer to switch which SPU is + * being monitored in a round robbin fashion. + */ +static void spu_evnt_swap(unsigned long data) +{ + int node; + int cur_phys_spu, nxt_phys_spu, cur_spu_evnt_phys_spu_indx; + unsigned long flags; + int cpu; + int ret; + u32 interrupt_mask; + + + /* enable interrupts on cntr 0 */ + interrupt_mask = CBE_PM_CTR_OVERFLOW_INTR(0); + + hdw_thread = 0; + + /* Make sure spu event interrupt handler and spu event swap + * don't access the counters simultaneously. + */ + spin_lock_irqsave(&cntr_lock, flags); + + cur_spu_evnt_phys_spu_indx = spu_evnt_phys_spu_indx; + + if (++(spu_evnt_phys_spu_indx) == NUM_SPUS_PER_NODE) + spu_evnt_phys_spu_indx = 0; + + pm_signal[0].sub_unit = spu_evnt_phys_spu_indx; + pm_signal[1].sub_unit = spu_evnt_phys_spu_indx; + pm_signal[2].sub_unit = spu_evnt_phys_spu_indx; + + /* switch the SPU being profiled on each node */ + for_each_online_cpu(cpu) { + if (cbe_get_hw_thread_id(cpu)) + continue; + + node = cbe_cpu_to_node(cpu); + cur_phys_spu = (node * NUM_SPUS_PER_NODE) + + cur_spu_evnt_phys_spu_indx; + nxt_phys_spu = (node * NUM_SPUS_PER_NODE) + + spu_evnt_phys_spu_indx; + + /* + * stop counters, save counter values, restore counts + * for previous physical SPU + */ + cbe_disable_pm(cpu); + cbe_disable_pm_interrupts(cpu); + + spu_pm_cnt[cur_phys_spu] + = cbe_read_ctr(cpu, 0); + + /* restore previous count for the next spu to sample */ + /* NOTE, hardware issue, counter will not start if the + * counter value is at max (0xFFFFFFFF). + */ + if (spu_pm_cnt[nxt_phys_spu] >= 0xFFFFFFFF) + cbe_write_ctr(cpu, 0, 0xFFFFFFF0); + else + cbe_write_ctr(cpu, 0, spu_pm_cnt[nxt_phys_spu]); + + pm_rtas_reset_signals(cbe_cpu_to_node(cpu)); + + /* setup the debug bus measure the one event and + * the two events to route the next SPU's PC on + * the debug bus + */ + ret = pm_rtas_activate_signals(cbe_cpu_to_node(cpu), 3); + if (ret) + printk(KERN_ERR "%s: pm_rtas_activate_signals failed, " + "SPU event swap\n", __func__); + + /* clear the trace buffer, don't want to take PC for + * previous SPU*/ + cbe_write_pm(cpu, trace_address, 0); + + enable_ctr(cpu, 0, pm_regs.pm07_cntrl); + + /* Enable interrupts on the CPU thread that is starting */ + cbe_enable_pm_interrupts(cpu, hdw_thread, + interrupt_mask); + cbe_enable_pm(cpu); + } + + spin_unlock_irqrestore(&cntr_lock, flags); + + /* swap approximately every 0.1 seconds */ + mod_timer(&timer_spu_event_swap, jiffies + HZ / 25); +} + +static void start_spu_event_swap(void) +{ + init_timer(&timer_spu_event_swap); + timer_spu_event_swap.function = spu_evnt_swap; + timer_spu_event_swap.data = 0UL; + timer_spu_event_swap.expires = jiffies + HZ / 25; + add_timer(&timer_spu_event_swap); +} + +static int cell_reg_setup_spu_events(struct op_counter_config *ctr, + struct op_system_config *sys, int num_ctrs) +{ + int i; + + /* routine is called once for all nodes */ + + spu_evnt_phys_spu_indx = 0; + /* + * For all events except 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. + */ + pm_rtas_token = rtas_token("ibm,cbe-perftools"); + + if (unlikely(pm_rtas_token == RTAS_UNKNOWN_SERVICE)) { + printk(KERN_ERR + "%s: rtas token ibm,cbe-perftools unknown\n", + __func__); + return -EIO; + } + + /* setup the pm_control register settings, + * settings will be written per node by the + * cell_cpu_setup() function. + */ + pm_regs.pm_cntrl.trace_buf_ovflw = 1; + + /* Use the occurrence trace mode to have SPU PC saved + * to the trace buffer. Occurrence data in trace buffer + * is not used. Bit 2 must be set to store SPU addresses. + */ + pm_regs.pm_cntrl.trace_mode = 2; + + pm_regs.pm_cntrl.spu_addr_trace = 0x1; /* using debug bus + event 2 & 3 */ + + /* setup the debug bus event array with the SPU PC routing events. + * Note, pm_signal[0] will be filled in by set_pm_event() call below. + */ + pm_signal[1].signal_group = SPU_PROFILE_EVENT_ADDR / 100; + pm_signal[1].bus_word = GET_BUS_WORD(SPU_PROFILE_EVENT_ADDR_MASK_A); + pm_signal[1].bit = SPU_PROFILE_EVENT_ADDR % 100; + pm_signal[1].sub_unit = spu_evnt_phys_spu_indx; + + pm_signal[2].signal_group = SPU_PROFILE_EVENT_ADDR / 100; + pm_signal[2].bus_word = GET_BUS_WORD(SPU_PROFILE_EVENT_ADDR_MASK_B); + pm_signal[2].bit = SPU_PROFILE_EVENT_ADDR % 100; + pm_signal[2].sub_unit = spu_evnt_phys_spu_indx; + + /* Set the user selected spu event to profile on, + * note, only one SPU profiling event is supported + */ + num_counters = 1; /* Only support one SPU event at a time */ + set_pm_event(0, ctr[0].event, ctr[0].unit_mask); + + reset_value[0] = 0xFFFFFFFF - ctr[0].count; + + /* global, used by cell_cpu_setup */ + ctr_enabled |= 1; + + /* Initialize the count for each SPU to the reset value */ + for (i=0; i < MAX_NUMNODES * NUM_SPUS_PER_NODE; i++) + spu_pm_cnt[i] = reset_value[0]; + + return 0; +} + +static int cell_reg_setup_ppu(struct op_counter_config *ctr, + struct op_system_config *sys, int num_ctrs) +{ + /* routine is called once for all nodes */ + int i, j, cpu; + + num_counters = num_ctrs; + + if (unlikely(num_ctrs > NR_PHYS_CTRS)) { + printk(KERN_ERR + "%s: Oprofile, number of specified events " \ + "exceeds number of physical counters\n", + __func__); + return -EIO; + } + + 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 all cpus combined */ +static int cell_reg_setup(struct op_counter_config *ctr, + struct op_system_config *sys, int num_ctrs) +{ + int ret=0; + spu_cycle_reset = 0; + + /* initialize the spu_arr_trace value, will be reset if + * doing spu event profiling. + */ + pm_regs.group_control = 0; + pm_regs.debug_bus_control = 0; + pm_regs.pm_cntrl.stop_at_max = 1; + pm_regs.pm_cntrl.trace_mode = 0; + pm_regs.pm_cntrl.freeze = 1; + pm_regs.pm_cntrl.trace_buf_ovflw = 0; + pm_regs.pm_cntrl.spu_addr_trace = 0; + + /* + * For all events except 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. + */ + pm_rtas_token = rtas_token("ibm,cbe-perftools"); + + if (unlikely(pm_rtas_token == RTAS_UNKNOWN_SERVICE)) { + printk(KERN_ERR + "%s: rtas token ibm,cbe-perftools unknown\n", + __func__); + return -EIO; + } + + if (ctr[0].event == SPU_CYCLES_EVENT_NUM) { + profiling_mode = SPU_PROFILING_CYCLES; + ret = cell_reg_setup_spu_cycles(ctr, sys, num_ctrs); + } else if ((ctr[0].event >= SPU_EVENT_NUM_START) && + (ctr[0].event <= SPU_EVENT_NUM_STOP)) { + profiling_mode = SPU_PROFILING_EVENTS; + spu_cycle_reset = ctr[0].count; + + /* for SPU event profiling, need to setup the + * pm_signal array with the events to route the + * SPU PC before making the FW call. Note, only + * one SPU event for profiling can be specified + * at a time. + */ + cell_reg_setup_spu_events(ctr, sys, num_ctrs); + } else { + profiling_mode = PPU_PROFILING; + ret = cell_reg_setup_ppu(ctr, sys, num_ctrs); + } + + return ret; +} + + + +/* 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; + int ret; + + /* Cycle based SPU profiling does not use the performance + * counters. The trace array is configured to collect + * the data. + */ + if (profiling_mode == SPU_PROFILING_CYCLES) + 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_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. + */ + if (profiling_mode == SPU_PROFILING_EVENTS) { + /* For SPU event profiling also need to setup the + * pm interval timer + */ + ret = pm_rtas_activate_signals(cbe_cpu_to_node(cpu), + num_enabled+2); + /* store PC from debug bus to Trace buffer as often + * as possible (every 10 cycles) + */ + cbe_write_pm(cpu, pm_interval, NUM_INTERVAL_CYC); + return ret; + } else + 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[NUM_SPUS_PER_NODE]; + + /* + * 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 < ARRAY_SIZE(pm_signal_local); 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, + (ARRAY_SIZE(pm_signal_local) + * sizeof(struct pm_signal))); + + if (unlikely(ret)) { + printk(KERN_WARNING "%s: rtas returned: %d\n", + __func__, 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)) + 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 + +/* + * 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_cycles(void) +{ + int subfunc, rtn_value; + unsigned int lfsr_value; + int cpu; + + oprofile_running = 0; + smp_wmb(); + +#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", + __func__, rtn_value); + } + + /* Deactivate the signals */ + pm_rtas_reset_signals(cbe_cpu_to_node(cpu)); + } + + stop_spu_profiling_cycles(); +} + +static void cell_global_stop_spu_events(void) +{ + int cpu; + oprofile_running = 0; + + stop_spu_profiling_events(); + 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); + cbe_write_pm07_control(cpu, 0, 0); + + /* Deactivate the signals */ + pm_rtas_reset_signals(cbe_cpu_to_node(cpu)); + + /* Deactivate interrupts */ + cbe_disable_pm_interrupts(cpu); + } + del_timer_sync(&timer_spu_event_swap); +} + +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 (profiling_mode == PPU_PROFILING) + cell_global_stop_ppu(); + else if (profiling_mode == SPU_PROFILING_EVENTS) + cell_global_stop_spu_events(); + else + cell_global_stop_spu_cycles(); +} + +static int cell_global_start_spu_cycles(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", __func__, ret); + rtas_error = -EIO; + goto out; + } + } + + rtas_error = start_spu_profiling_cycles(spu_cycle_reset); + if (rtas_error) + goto out_stop; + + oprofile_running = 1; + return 0; + +out_stop: + cell_global_stop_spu_cycles(); /* clean up the PMU/debug bus */ +out: + return rtas_error; +} + +static int cell_global_start_spu_events(struct op_counter_config *ctr) +{ + int cpu; + u32 interrupt_mask = 0; + int rtn = 0; + + hdw_thread = 0; + + /* spu event profiling, uses the performance counters to generate + * an interrupt. The hardware is setup to store the SPU program + * counter into the trace array. The occurrence mode is used to + * enable storing data to the trace buffer. The bits are set + * to send/store the SPU address in the trace buffer. The debug + * bus must be setup to route the SPU program counter onto the + * debug bus. The occurrence data in the trace buffer is not used. + */ + + /* 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; + + /* + * Setup SPU event-based profiling. + * Set perf_mon_control bit 0 to a zero before + * enabling spu collection hardware. + * + * Only support one SPU event on one SPU per node. + */ + if (ctr_enabled & 1) { + cbe_write_ctr(cpu, 0, reset_value[0]); + enable_ctr(cpu, 0, pm_regs.pm07_cntrl); + interrupt_mask |= + CBE_PM_CTR_OVERFLOW_INTR(0); + } else { + /* Disable counter */ + cbe_write_pm07_control(cpu, 0, 0); + } + + cbe_get_and_clear_pm_interrupts(cpu); + cbe_enable_pm_interrupts(cpu, hdw_thread, interrupt_mask); + cbe_enable_pm(cpu); + + /* clear the trace buffer */ + cbe_write_pm(cpu, trace_address, 0); + } + + /* Start the timer to time slice collecting the event profile + * on each of the SPUs. Note, can collect profile on one SPU + * per node at a time. + */ + start_spu_event_swap(); + start_spu_profiling_events(); + oprofile_running = 1; + smp_wmb(); + + return rtn; +} + +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 (profiling_mode == SPU_PROFILING_CYCLES) + return cell_global_start_spu_cycles(ctr); + else if (profiling_mode == SPU_PROFILING_EVENTS) + return cell_global_start_spu_events(ctr); + else + return cell_global_start_ppu(ctr); +} + + +/* The SPU interrupt handler + * + * SPU event profiling works as follows: + * The pm_signal[0] holds the one SPU event to be measured. It is routed on + * the debug bus using word 0 or 1. The value of pm_signal[1] and + * pm_signal[2] contain the necessary events to route the SPU program + * counter for the selected SPU onto the debug bus using words 2 and 3. + * The pm_interval register is setup to write the SPU PC value into the + * trace buffer at the maximum rate possible. The trace buffer is configured + * to store the PCs, wrapping when it is full. The performance counter is + * initialized to the max hardware count minus the number of events, N, between + * samples. Once the N events have occurred, a HW counter overflow occurs + * causing the generation of a HW counter interrupt which also stops the + * writing of the SPU PC values to the trace buffer. Hence the last PC + * written to the trace buffer is the SPU PC that we want. Unfortunately, + * we have to read from the beginning of the trace buffer to get to the + * last value written. We just hope the PPU has nothing better to do then + * service this interrupt. The PC for the specific SPU being profiled is + * extracted from the trace buffer processed and stored. The trace buffer + * is cleared, interrupts are cleared, the counter is reset to max - N. + * A kernel timer is used to periodically call the routine spu_evnt_swap() + * to switch to the next physical SPU in the node to profile in round robbin + * order. This way data is collected for all SPUs on the node. It does mean + * that we need to use a relatively small value of N to ensure enough samples + * on each SPU are collected each SPU is being profiled 1/8 of the time. + * It may also be necessary to use a longer sample collection period. + */ +static void cell_handle_interrupt_spu(struct pt_regs *regs, + struct op_counter_config *ctr) +{ + u32 cpu, cpu_tmp; + u64 trace_entry; + u32 interrupt_mask; + u64 trace_buffer[2]; + u64 last_trace_buffer; + u32 sample; + u32 trace_addr; + unsigned long sample_array_lock_flags; + int spu_num; + unsigned long flags; + + /* Make sure spu event interrupt handler and spu event swap + * don't access the counters simultaneously. + */ + cpu = smp_processor_id(); + spin_lock_irqsave(&cntr_lock, flags); + + cpu_tmp = cpu; + cbe_disable_pm(cpu); + + interrupt_mask = cbe_get_and_clear_pm_interrupts(cpu); + + sample = 0xABCDEF; + trace_entry = 0xfedcba; + last_trace_buffer = 0xdeadbeaf; + + if ((oprofile_running == 1) && (interrupt_mask != 0)) { + /* disable writes to trace buff */ + cbe_write_pm(cpu, pm_interval, 0); + + /* only have one perf cntr being used, cntr 0 */ + if ((interrupt_mask & CBE_PM_CTR_OVERFLOW_INTR(0)) + && ctr[0].enabled) + /* The SPU PC values will be read + * from the trace buffer, reset counter + */ + + cbe_write_ctr(cpu, 0, reset_value[0]); + + trace_addr = cbe_read_pm(cpu, trace_address); + + while (!(trace_addr & CBE_PM_TRACE_BUF_EMPTY)) { + /* There is data in the trace buffer to process + * Read the buffer until you get to the last + * entry. This is the value we want. + */ + + cbe_read_trace_buffer(cpu, trace_buffer); + trace_addr = cbe_read_pm(cpu, trace_address); + } + + /* SPU Address 16 bit count format for 128 bit + * HW trace buffer is used for the SPU PC storage + * HDR bits 0:15 + * SPU Addr 0 bits 16:31 + * SPU Addr 1 bits 32:47 + * unused bits 48:127 + * + * HDR: bit4 = 1 SPU Address 0 valid + * HDR: bit5 = 1 SPU Address 1 valid + * - unfortunately, the valid bits don't seem to work + * + * Note trace_buffer[0] holds bits 0:63 of the HW + * trace buffer, trace_buffer[1] holds bits 64:127 + */ + + trace_entry = trace_buffer[0] + & 0x00000000FFFF0000; + + /* only top 16 of the 18 bit SPU PC address + * is stored in trace buffer, hence shift right + * by 16 -2 bits */ + sample = trace_entry >> 14; + last_trace_buffer = trace_buffer[0]; + + spu_num = spu_evnt_phys_spu_indx + + (cbe_cpu_to_node(cpu) * NUM_SPUS_PER_NODE); + + /* make sure only one process at a time is calling + * spu_sync_buffer() + */ + spin_lock_irqsave(&oprof_spu_smpl_arry_lck, + sample_array_lock_flags); + spu_sync_buffer(spu_num, &sample, 1); + spin_unlock_irqrestore(&oprof_spu_smpl_arry_lck, + sample_array_lock_flags); + + smp_wmb(); /* insure spu event buffer updates are written + * don't want events intermingled... */ + + /* The counters were frozen by the interrupt. + * Reenable the interrupt and restart the counters. + */ + cbe_write_pm(cpu, pm_interval, NUM_INTERVAL_CYC); + cbe_enable_pm_interrupts(cpu, hdw_thread, + virt_cntr_inter_mask); + + /* clear the trace buffer, re-enable writes to trace buff */ + cbe_write_pm(cpu, trace_address, 0); + cbe_write_pm(cpu, pm_interval, NUM_INTERVAL_CYC); + + /* 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 performance monitor needs to + * be disabled while writing to the latches. This is a + * HW design issue. + */ + write_pm_cntrl(cpu); + cbe_enable_pm(cpu); + } + spin_unlock_irqrestore(&cntr_lock, flags); +} + +static void cell_handle_interrupt_ppu(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(&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_ext_sample(pc, regs, i, is_kernel); + 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 virtual 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 performance monitor needs to + * be disabled while writing to the latches. This is a + * HW design issue. + */ + cbe_enable_pm(cpu); + } + spin_unlock_irqrestore(&cntr_lock, flags); +} + +static void cell_handle_interrupt(struct pt_regs *regs, + struct op_counter_config *ctr) +{ + if (profiling_mode == PPU_PROFILING) + cell_handle_interrupt_ppu(regs, ctr); + else + cell_handle_interrupt_spu(regs, ctr); +} + +/* + * 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 ((profiling_mode == SPU_PROFILING_CYCLES) || + (profiling_mode == SPU_PROFILING_EVENTS)) + return spu_sync_start(); + else + return DO_GENERIC_SYNC; +} + +static int cell_sync_stop(void) +{ + if ((profiling_mode == SPU_PROFILING_CYCLES) || + (profiling_mode == SPU_PROFILING_EVENTS)) + 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, +}; |