[RFC, Patch 1/1] OProfile for Cell: Initial profiling support --new patch
From: Maynard Johnson
Date: Wed Nov 15 2006 - 13:52:11 EST
Index: linux-2.6.18/arch/powerpc/configs/cell_defconfig
===================================================================
--- linux-2.6.18.orig/arch/powerpc/configs/cell_defconfig 2006-11-15 10:44:42.880315592 -0600
+++ linux-2.6.18/arch/powerpc/configs/cell_defconfig 2006-11-15 10:45:30.735227560 -0600
@@ -1099,7 +1099,8 @@
#
# Instrumentation Support
#
-# CONFIG_PROFILING is not set
+CONFIG_PROFILING=y
+CONFIG_OPROFILE=y
# CONFIG_KPROBES is not set
#
Index: linux-2.6.18/arch/powerpc/kernel/cputable.c
===================================================================
--- linux-2.6.18.orig/arch/powerpc/kernel/cputable.c 2006-11-15 10:44:40.584264280 -0600
+++ linux-2.6.18/arch/powerpc/kernel/cputable.c 2006-11-15 10:45:30.738227104 -0600
@@ -304,6 +304,9 @@
PPC_FEATURE_SMT,
.icache_bsize = 128,
.dcache_bsize = 128,
+ .num_pmcs = 4,
+ .oprofile_cpu_type = "ppc64/cell-be",
+ .oprofile_type = PPC_OPROFILE_CELL,
.platform = "ppc-cell-be",
},
{ /* PA Semi PA6T */
Index: linux-2.6.18/arch/powerpc/oprofile/common.c
===================================================================
--- linux-2.6.18.orig/arch/powerpc/oprofile/common.c 2006-11-15 10:44:40.168195360 -0600
+++ linux-2.6.18/arch/powerpc/oprofile/common.c 2006-11-15 10:45:30.740226800 -0600
@@ -141,6 +141,11 @@
switch (cur_cpu_spec->oprofile_type) {
#ifdef CONFIG_PPC64
+#ifdef CONFIG_PPC_CELL
+ case PPC_OPROFILE_CELL:
+ model = &op_model_cell;
+ break;
+#endif
case PPC_OPROFILE_RS64:
model = &op_model_rs64;
break;
Index: linux-2.6.18/arch/powerpc/oprofile/Makefile
===================================================================
--- linux-2.6.18.orig/arch/powerpc/oprofile/Makefile 2006-11-15 10:44:40.166195664 -0600
+++ linux-2.6.18/arch/powerpc/oprofile/Makefile 2006-11-15 10:45:30.741226648 -0600
@@ -11,6 +11,7 @@
timer_int.o )
oprofile-y := $(DRIVER_OBJS) common.o backtrace.o
+oprofile-$(CONFIG_PPC_CELL) += op_model_cell.o
oprofile-$(CONFIG_PPC64) += op_model_rs64.o op_model_power4.o
oprofile-$(CONFIG_FSL_BOOKE) += op_model_fsl_booke.o
oprofile-$(CONFIG_6xx) += op_model_7450.o
Index: linux-2.6.18/arch/powerpc/oprofile/op_model_cell.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.18/arch/powerpc/oprofile/op_model_cell.c 2006-11-15 11:13:45.512316720 -0600
@@ -0,0 +1,717 @@
+/*
+ * Cell Broadband Engine OProfile Support
+ *
+ * (C) Copyright IBM Corporation 2006
+ *
+ * Author: David Erb (djerb@xxxxxxxxxx)
+ * Modifications:
+ * Carl Love <carll@xxxxxxxxxx>
+ * Maynard Johnson <maynardj@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/cpufreq.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/kthread.h>
+#include <linux/oprofile.h>
+#include <linux/percpu.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
+#include <linux/timer.h>
+#include <asm/cell-pmu.h>
+#include <asm/cputable.h>
+#include <asm/firmware.h>
+#include <asm/io.h>
+#include <asm/oprofile_impl.h>
+#include <asm/processor.h>
+#include <asm/prom.h>
+#include <asm/ptrace.h>
+#include <asm/reg.h>
+#include <asm/rtas.h>
+#include <asm/system.h>
+
+#include "../platforms/cell/interrupt.h"
+
+#define PPU_CYCLES_EVENT_NUM 1 /* event number for CYCLES */
+#define CBE_COUNT_ALL_CYCLES 0x42800000 /* PPU cycle event specifier */
+
+#define NUM_THREADS 2
+#define VIRT_CNTR_SW_TIME_NS 100000000 // 0.5 seconds
+
+struct pmc_cntrl_data {
+ unsigned long vcntr;
+ unsigned long evnts;
+ unsigned long masks;
+ unsigned long enabled;
+};
+
+/*
+ * ibm,cbe-perftools rtas parameters
+ */
+
+struct pm_signal {
+ u16 cpu; /* Processor to modify */
+ u16 sub_unit; /* hw subunit this applies to (if applicable) */
+ u16 signal_group; /* Signal Group to Enable/Disable */
+ u8 bus_word; /* Enable/Disable on this Trace/Trigger/Event
+ * Bus Word(s) (bitmask)
+ */
+ u8 bit; /* Trigger/Event bit (if applicable) */
+};
+
+/*
+ * rtas call arguments
+ */
+enum {
+ SUBFUNC_RESET = 1,
+ SUBFUNC_ACTIVATE = 2,
+ SUBFUNC_DEACTIVATE = 3,
+
+ PASSTHRU_IGNORE = 0,
+ PASSTHRU_ENABLE = 1,
+ PASSTHRU_DISABLE = 2,
+};
+
+struct pm_cntrl {
+ u16 enable;
+ u16 stop_at_max;
+ u16 trace_mode;
+ u16 freeze;
+ u16 count_mode;
+};
+
+static struct {
+ u32 group_control;
+ u32 debug_bus_control;
+ struct pm_cntrl pm_cntrl;
+ u32 pm07_cntrl[NR_PHYS_CTRS];
+} pm_regs;
+
+
+#define GET_SUB_UNIT(x) ((x & 0x0000f000) >> 12)
+#define GET_BUS_WORD(x) ((x & 0x000000f0) >> 4)
+#define GET_BUS_TYPE(x) ((x & 0x00000300) >> 8)
+#define GET_POLARITY(x) ((x & 0x00000002) >> 1)
+#define GET_COUNT_CYCLES(x) (x & 0x00000001)
+#define GET_INPUT_CONTROL(x) ((x & 0x00000004) >> 2)
+
+
+DEFINE_PER_CPU(unsigned long[NR_PHYS_CTRS], pmc_values);
+
+struct pmc_cntrl_data pmc_cntrl[NUM_THREADS][NR_PHYS_CTRS];
+
+/* Interpetation of hdw_thread:
+ * 0 - even virtual cpus 0, 2, 4,...
+ * 1 - odd virtual cpus 1, 3, 5, ...
+ */
+static u32 hdw_thread;
+
+static u32 virt_cntr_inter_mask;
+static struct timer_list timer_virt_cntr;
+
+/* pm_signal needs to be glogal since it is initialized in
+ * cell_reg_setup at the time when the necessary information
+ * is available.
+ */
+static struct pm_signal pm_signal[NR_PHYS_CTRS];
+static int pm_rtas_token;
+
+static u32 reset_value[NR_PHYS_CTRS];
+static int num_counters;
+static int oprofile_running;
+static spinlock_t stop_virt_lock = SPIN_LOCK_UNLOCKED;
+static spinlock_t virt_cntr_lock = SPIN_LOCK_UNLOCKED;
+
+static u32 ctr_enabled;
+
+static unsigned char trace_bus[4];
+static unsigned char input_bus[2];
+
+/*
+ * Firmware interface functions
+ */
+static int
+rtas_ibm_cbe_perftools(int subfunc, int passthru,
+ void *address, unsigned long length)
+{
+ u64 paddr = __pa(address);
+
+ return rtas_call(pm_rtas_token, 5, 1, NULL, subfunc, passthru,
+ paddr >> 32, paddr & 0xffffffff, length);
+}
+
+static void pm_rtas_reset_signals(u32 node)
+{
+ int ret;
+ struct pm_signal pm_signal_local[NR_PHYS_CTRS];
+
+ /* 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[0].cpu = node;
+ pm_signal_local[0].signal_group = 21;
+ pm_signal_local[0].bus_word = 1;
+ pm_signal_local[0].sub_unit = 0;
+ pm_signal_local[0].bit = 0;
+
+ ret = rtas_ibm_cbe_perftools(SUBFUNC_RESET, PASSTHRU_DISABLE,
+ pm_signal_local,
+ sizeof(struct pm_signal));
+
+ if (ret)
+ printk(KERN_WARNING "%s: rtas returned: %d\n",
+ __FUNCTION__, ret);
+}
+
+static void pm_rtas_activate_signals(u32 node, u32 count)
+{
+ int ret;
+ int j;
+ struct pm_signal pm_signal_local[NR_PHYS_CTRS];
+
+ for (j = 0; j < count; j++) {
+ /* fw expects physical cpu # */
+ pm_signal_local[j].cpu = node;
+ pm_signal_local[j].signal_group = pm_signal[j].signal_group;
+ pm_signal_local[j].bus_word = pm_signal[j].bus_word;
+ pm_signal_local[j].sub_unit = pm_signal[j].sub_unit;
+ pm_signal_local[j].bit = pm_signal[j].bit;
+ }
+
+ ret = rtas_ibm_cbe_perftools(SUBFUNC_ACTIVATE, PASSTHRU_ENABLE,
+ pm_signal_local,
+ count * sizeof(struct pm_signal));
+
+ if (ret)
+ printk(KERN_WARNING "%s: rtas returned: %d\n",
+ __FUNCTION__, ret);
+}
+
+/*
+ * PM Signal functions
+ */
+static void set_pm_event(u32 ctr, int event, u32 unit_mask)
+{
+ struct pm_signal *p;
+ u32 signal_bit;
+ u32 bus_word, bus_type, count_cycles, polarity, input_control;
+ int j, i;
+
+ if (event == PPU_CYCLES_EVENT_NUM) {
+ /* Special Event: Count all cpu cycles */
+ pm_regs.pm07_cntrl[ctr] = CBE_COUNT_ALL_CYCLES;
+ p = &(pm_signal[ctr]);
+ p->signal_group = 21;
+ p->bus_word = 1;
+ p->sub_unit = 0;
+ p->bit = 0;
+ goto out;
+ } else {
+ pm_regs.pm07_cntrl[ctr] = 0;
+ }
+
+ bus_word = GET_BUS_WORD(unit_mask);
+ bus_type = GET_BUS_TYPE(unit_mask);
+ count_cycles = GET_COUNT_CYCLES(unit_mask);
+ polarity = GET_POLARITY(unit_mask);
+ input_control = GET_INPUT_CONTROL(unit_mask);
+ signal_bit = (event % 100);
+
+ p = &(pm_signal[ctr]);
+
+ p->signal_group = event / 100;
+ p->bus_word = bus_word;
+ p->sub_unit = unit_mask & 0x0000f000;
+
+ pm_regs.pm07_cntrl[ctr] = 0;
+ pm_regs.pm07_cntrl[ctr] |= PM07_CTR_COUNT_CYCLES(count_cycles);
+ pm_regs.pm07_cntrl[ctr] |= PM07_CTR_POLARITY(polarity);
+ pm_regs.pm07_cntrl[ctr] |= PM07_CTR_INPUT_CONTROL(input_control);
+
+ 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 < 4; i++) {
+ if (bus_word & (1 << i)) {
+ pm_regs.debug_bus_control |=
+ (bus_type << (31 - (2 * i) + 1));
+
+ for (j = 0; j < 2; j++) {
+ if (input_bus[j] == 0xff) {
+ input_bus[j] = i;
+ pm_regs.group_control |=
+ (i << (31 - i));
+ break;
+ }
+ }
+ }
+ }
+out:
+ return;
+}
+
+static void write_pm_cntrl(int cpu, struct pm_cntrl * pm_cntrl)
+{
+ /* Oprofile will use 32 bit counters, set bits 7:10 to 0 */
+ u32 val = 0;
+ if (pm_cntrl->enable == 1)
+ val |= CBE_PM_ENABLE_PERF_MON;
+
+ if (pm_cntrl->stop_at_max == 1)
+ val |= CBE_PM_STOP_AT_MAX;
+
+ if (pm_cntrl->trace_mode == 1)
+ val |= CBE_PM_TRACE_MODE_SET(pm_cntrl->trace_mode);
+
+ if (pm_cntrl->freeze == 1)
+ val |= CBE_PM_FREEZE_ALL_CTRS;
+
+ /* 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_cntrl->count_mode);
+ cbe_write_pm(cpu, pm_control, val);
+}
+
+static inline void
+set_count_mode(u32 kernel, u32 user, struct pm_cntrl *pm_cntrl)
+{
+ /* The user must specify user and kernel if they want them. If
+ * neither is specified, OProfile will count in hypervisor mode
+ */
+ if (kernel) {
+ if (user)
+ pm_cntrl->count_mode = CBE_COUNT_ALL_MODES;
+ else
+ pm_cntrl->count_mode = CBE_COUNT_SUPERVISOR_MODE;
+ } else {
+ if (user)
+ pm_cntrl->count_mode = CBE_COUNT_PROBLEM_MODE;
+ else
+ pm_cntrl->count_mode = CBE_COUNT_HYPERVISOR_MODE;
+ }
+}
+
+static inline void enable_ctr(u32 cpu, u32 ctr, u32 * pm07_cntrl)
+{
+
+ pm07_cntrl[ctr] |= PM07_CTR_ENABLE(1);
+ cbe_write_pm07_control(cpu, ctr, pm07_cntrl[ctr]);
+}
+
+/*
+ * Oprofile setup functions
+ */
+static void cell_virtual_cntr(unsigned long data)
+{
+ /* This routine will alternate loading the virtual counters for
+ * virtual CPUs
+ */
+ int i, cntr_offset_prev, cntr_offset_next;
+ u32 cpu;
+ unsigned long flags = 0;
+ int num_enabled = 0;
+
+ /* Make sure that the interrupt_hander and
+ * the virt counter are not both playing with
+ * the counters on the same node. */
+
+ spin_lock_irqsave(&virt_cntr_lock, flags);
+
+ /* cntr offset for the cntrs that were running */
+ cntr_offset_prev = num_counters * hdw_thread;
+
+ /* switch the cpu handling the interrupts */
+ hdw_thread = 1 ^ hdw_thread;
+
+ /* cntr offset for the cntrs to start */
+ cntr_offset_next = num_counters * hdw_thread;
+ /* 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);
+ if (cbe_query_pm_interrupts(cpu)) {
+ /* There is a pending interrupt. We will clear it.
+ * The cntr value will be 0xffffffff. We will
+ * 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.
+ * Ignore return value from cbe_clear_pm_interrupts()
+ */
+ cbe_clear_pm_interrupts(cpu);
+ }
+
+ cbe_disable_pm_interrupts(cpu);
+ for (i = 0; i < num_counters; i++) {
+ per_cpu(pmc_values, cpu)[i + cntr_offset_prev]
+ = cbe_read_ctr(cpu, i);
+
+ if (per_cpu(pmc_values, cpu)[i+cntr_offset_next] == \
+ 0xFFFFFFFF)
+ /* Make sure the counter is not restored to
+ * the max value. If you do, the counters
+ * will not increment, and no interrupts will
+ * occur.
+ */
+ cbe_write_ctr(cpu, i, 0xFFFFFFF0);
+ else
+ cbe_write_ctr(cpu, i,
+ per_cpu(pmc_values,
+ cpu)[i+cntr_offset_next]);
+ }
+
+ /* Switch to the other thread. Change the interrupt
+ * and control regs to be scheduled on the CPU
+ * corresponding to the thread to execute.
+ */
+ num_enabled = 0;
+
+ for (i = 0; i < num_counters; i++) {
+ if (pmc_cntrl[hdw_thread][i+cntr_offset_next].enabled) {
+ set_pm_event(num_enabled,
+ pmc_cntrl[hdw_thread][i].enabled,
+ pmc_cntrl[hdw_thread][i].masks);
+
+ num_enabled++;
+ ctr_enabled |= (1 << i);
+ }
+ }
+
+ /* Enable interrupts on the CPU thread that is starting */
+ cbe_enable_pm_interrupts(cpu, hdw_thread,
+ virt_cntr_inter_mask);
+ cbe_enable_pm(cpu);
+ }
+
+ spin_unlock_irqrestore(&virt_cntr_lock, flags);
+
+ timer_virt_cntr.expires = jiffies + HZ/10;
+ add_timer(&timer_virt_cntr);
+
+ return;
+}
+
+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 void
+cell_reg_setup(struct op_counter_config *ctr,
+ struct op_system_config *sys, int num_ctrs)
+{
+ int i, j;
+ int num_enabled = 0;
+
+ smp_mb();
+ pm_rtas_token = rtas_token("ibm,cbe-perftools");
+ if (pm_rtas_token == RTAS_UNKNOWN_SERVICE) {
+ printk(KERN_WARNING "%s: RTAS_UNKNOWN_SERVICE\n",
+ __FUNCTION__);
+ goto out;
+ }
+
+ 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,
+ &pm_regs.pm_cntrl);
+
+ /* 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 < 4; i++)
+ trace_bus[i] = 0xff;
+
+ for (i = 0; i < 2; 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(num_enabled,
+ pmc_cntrl[0][i].evnts,
+ pmc_cntrl[0][i].masks);
+ num_enabled++;
+ ctr_enabled |= (1 << i);
+ }
+ }
+
+ start_virt_cntrs();
+out:
+ return;
+}
+
+/* This function is called once for each cpu */
+static void cell_cpu_setup(void *unused)
+{
+ u32 cpu = smp_processor_id();
+ u32 num_enabled = 0;
+ int i;
+
+ /* 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))
+ goto out;
+
+ if (pm_rtas_token == RTAS_UNKNOWN_SERVICE) {
+ printk(KERN_WARNING "%s: RTAS_UNKNOWN_SERVICE\n",
+ __FUNCTION__);
+ goto out;
+ }
+
+ /* 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, &pm_regs.pm_cntrl);
+
+ for (i = 0; i < num_counters; ++i) {
+ if (ctr_enabled & (1 << i)) {
+ pm_signal[num_enabled].cpu = cbe_cpu_to_node(cpu);
+ num_enabled++;
+ }
+ }
+
+ pm_rtas_activate_signals(cbe_cpu_to_node(cpu), num_enabled);
+out:
+ return;
+}
+
+static void cell_start(struct op_counter_config *ctr)
+{
+ u32 cpu = smp_processor_id();
+ u32 interrupt_mask;
+ u32 i;
+
+ /* There is one performance monitor per node, so we
+ * only need to perform this function once per node.
+ */
+ if (cbe_get_hw_thread_id(cpu))
+ goto out;
+
+ 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_clear_pm_interrupts(cpu);
+ virt_cntr_inter_mask = interrupt_mask;
+ cbe_enable_pm_interrupts(cpu, hdw_thread, interrupt_mask);
+ cbe_enable_pm(cpu);
+ oprofile_running = 1;
+ smp_mb();
+out:
+ return;
+}
+
+static void cell_stop(void)
+{
+ u32 cpu = smp_processor_id();
+ unsigned long flags = 0;
+
+ /* There is one performance monitor per node, so we
+ * only need to perform this function once per node.
+ */
+
+ if (cbe_get_hw_thread_id(cpu))
+ goto out;
+
+ /* Make sure only once CPU at a time trys to cancel
+ * the timer
+ */
+ spin_lock_irqsave(&stop_virt_lock, flags);
+ if (timer_pending(&timer_virt_cntr))
+ del_timer_sync(&timer_virt_cntr);
+ spin_unlock_irqrestore(&stop_virt_lock, flags);
+
+ smp_mb();
+
+ /* 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);
+
+ oprofile_running = 0;
+ smp_mb();
+out:
+ return;
+}
+
+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_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.
+ */
+ cbe_enable_pm_interrupts(cpu, hdw_thread, interrupt_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 writting to the latches. This is a
+ * HW design issue.
+ */
+ cbe_enable_pm(cpu);
+ }
+ spin_unlock_irqrestore(&virt_cntr_lock, flags);
+}
+
+struct op_powerpc_model op_model_cell = {
+ .reg_setup = cell_reg_setup,
+ .cpu_setup = cell_cpu_setup,
+ .start = cell_start,
+ .stop = cell_stop,
+ .handle_interrupt = cell_handle_interrupt,
+};
Index: linux-2.6.18/arch/powerpc/platforms/cell/cbe_regs.c
===================================================================
--- linux-2.6.18.orig/arch/powerpc/platforms/cell/cbe_regs.c 2006-11-15 10:44:40.629257440 -0600
+++ linux-2.6.18/arch/powerpc/platforms/cell/cbe_regs.c 2006-11-15 10:45:30.750225280 -0600
@@ -132,6 +132,18 @@
}
EXPORT_SYMBOL_GPL(cbe_get_cpu_mic_tm_regs);
+/* FIXME
+ * This is little more than a stub at the moment. It should be
+ * fleshed out so that it works for both SMT and non-SMT, no
+ * matter if the passed cpu is odd or even.
+ * For SMT enabled, returns 0 for even-numbered cpu; otherwise 1.
+ * For SMT disabled, returns 0 for all cpus.
+ */
+u32 cbe_get_hw_thread_id(int cpu)
+{
+ return (cpu & 1);
+}
+EXPORT_SYMBOL_GPL(cbe_get_hw_thread_id);
void __init cbe_regs_init(void)
{
Index: linux-2.6.18/include/asm-powerpc/cell-pmu.h
===================================================================
--- linux-2.6.18.orig/include/asm-powerpc/cell-pmu.h 2006-11-15 10:45:06.386200720 -0600
+++ linux-2.6.18/include/asm-powerpc/cell-pmu.h 2006-11-15 11:14:53.737196336 -0600
@@ -92,4 +92,21 @@
extern u32 cbe_query_pm_interrupts(u32 cpu);
extern u32 cbe_clear_pm_interrupts(u32 cpu);
+/* Utility functions, macros */
+extern u32 cbe_get_hw_thread_id(int cpu);
+
+#define cbe_cpu_to_node(cpu) ((cpu) >> 1)
+
+#define CBE_COUNT_SUPERVISOR_MODE 0
+#define CBE_COUNT_HYPERVISOR_MODE 1
+#define CBE_COUNT_PROBLEM_MODE 2
+#define CBE_COUNT_ALL_MODES 3
+
+/* Macros for the pm07_control registers. */
+#define PM07_CTR_INPUT_MUX(x) ((((x) & 1) << 26) & 0x3f)
+#define PM07_CTR_INPUT_CONTROL(x) (((x) & 1) << 25)
+#define PM07_CTR_POLARITY(x) (((x) & 1) << 24)
+#define PM07_CTR_COUNT_CYCLES(x) (((x) & 1) << 23)
+#define PM07_CTR_ENABLE(x) (((x) & 1) << 22)
+
#endif /* __ASM_CELL_PMU_H__ */
Index: linux-2.6.18/include/asm-powerpc/cputable.h
===================================================================
--- linux-2.6.18.orig/include/asm-powerpc/cputable.h 2006-11-15 10:44:40.369296960 -0600
+++ linux-2.6.18/include/asm-powerpc/cputable.h 2006-11-15 10:45:30.754224672 -0600
@@ -45,6 +45,7 @@
PPC_OPROFILE_POWER4 = 2,
PPC_OPROFILE_G4 = 3,
PPC_OPROFILE_BOOKE = 4,
+ PPC_OPROFILE_CELL = 5,
};
struct cpu_spec {
Index: linux-2.6.18/include/asm-powerpc/oprofile_impl.h
===================================================================
--- linux-2.6.18.orig/include/asm-powerpc/oprofile_impl.h 2006-11-15 10:44:40.204189888 -0600
+++ linux-2.6.18/include/asm-powerpc/oprofile_impl.h 2006-11-15 10:45:30.755224520 -0600
@@ -54,6 +54,7 @@
extern struct op_powerpc_model op_model_rs64;
extern struct op_powerpc_model op_model_power4;
extern struct op_powerpc_model op_model_7450;
+extern struct op_powerpc_model op_model_cell;
#ifndef CONFIG_FSL_BOOKE